US 20070034700 A1
An electronic card includes a digital processor, an electrochemical battery and a communications port. The processor and battery are essentially coplanar, and are sandwiched between and enclosed by two flexible covers, preferably made from an insulating plastic material, and preferably fitted to the components that they enclose. The communications port can include, for example, a Smart Card contact port, a stripe emulator, an RF port, and IR port, etc. The battery may comprise a rechargeable battery. In an exemplary embodiment, at least the processor is carried by a flexible printed circuit (PC) board. In other exemplary embodiments, switches and/or indicators are also carried by the PC board. A method for manufacturing an electronic card having at least two components is also disclosed.
1. An electronic card comprising:
a thin, flat digital processor having a first substantially planar surface and a substantially opposing second substantially planar surface, wherein at least one of said first surface, said second surface, and a cross-section of said processor define a maximum surface area;
a thin, flat electrochemical battery having a first substantially planar surface and a substantially opposing second substantially planar surface, wherein at least one of said first surface, said second surface, and a cross-section of said processor define a maximum surface area, said battery being positioned substantially co-planar with said processor and capable of powering said processor;
a communications port coupled to said processor;
a first flexible cover and an opposing second flexible cover, each having card a surface area greater than the combined maximum surface areas of said digital processor and said battery;
wherein said processor and said battery are sandwiched between and enclosed by said first flexible cover and said second flexible cover.
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24. A method for making an electronic card comprising:
making a flexible printed circuit board;
attaching at least one processor to said printed circuit board;
coupling at least one battery to said printed circuit board;
encapsulating at least said one processor;
making a top cover and a bottom cover; and
sandwiching said printed circuit board, said processor and said battery between said top cover and said bottom cover.
25. An enhanced Smart Card comprising:
a card body provided with an externally accessible card interface including a signal port, a power port, and a ground port;
a secure processor disposed at least partially within said card body and coupled to said signal port, said power port, and said ground port;
a general processor disposed at least partially within said card body, said general processor being coupled to a power source disposed at least partially within said card body and being operative to provide power to and communicate with said secure processor when said secure processor is being used in an enhanced Smart Card mode; and
a non-contact communications port coupled to at least one of said secure processor and said general processor.
26. A secure transaction card comprising:
a card body;
a secure processor disposed at least partially within said card body;
a general processor disposed at least partially within said card body;
a power source disposed at least partially within said card body; and
a non-contact communications port coupled to at least one of said secure processor and said general processor.
27. A swipe emulating broadcaster system comprising:
a coil including an elongated core material and a winding having a plurality of turns around said core material; and
a signal generator having a broadcaster driver signal coupled to said coil such that said coil provides a dynamic magnetic field which emulates the swiping of a magnetic stripe transaction card past a read head of a card reader.
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35. A method for creating a low-loop bonding for thin profile applications comprising:
attaching a first surface of a fabricated semiconductor die to a first surface of a substrate having a plurality of substrate contact pads, such that a second surface of said die which opposes said first surface is exposed to provide access to a plurality of die contact pads;
wire bonding a first end of a wire to a substrate contact pad; and
wire bonding a second end of said wire to a die contact pad, such that the loop height of said wire is no greater that 5 mils above said second surface of said die, and no greater than 20 mils above said first surface of said substrate.
This application claims the benefit of U.S. Ser. No. 60/675,388 filed Apr. 27, 2005, and is a Continuation-in-Part of U.S. Ser. No. 11/391,719 filed Mar. 27, 2006, both of which are incorporated herein by reference.
Exemplary embodiments disclosed herein pertain to electronic cards. More particularly, exemplary embodiments disclosed herein pertain to secure electronic cards and methods for making same.
There are a great many applications for electronic security. For example, security is desirable or required for financial transactions, or for providing access to various physical and non-physical resources. One area of great concern for electronic security is in the field of financial transaction cards, e.g. credit and debit cards.
Conventional credit cards, debit cards and other financial transaction cards (hereafter “transaction cards” ) have a typically plastic body upon which is embossed a 16 digit account number and other data. A magnetic strip, usually referred to as a “stripe” , is adhered to the back of the card. The stripe typically magnetically encodes the account number and/or other data.
A stripe is typically a magnetic tape material much like the magnetic tape used in digital data recording. The stripe material typically includes a magnetic oxide and binder compounds that provide the magnetic stripe with data encoding capabilities and physical durability characteristics needed for transaction card applications. While these magnetic tape components have been optimized for transaction card applications the magnetic tape used for the magnetic stripe on a transaction card is very similar to standard digital data recording tape.
The two most common magnetic oxides used in magnetic stripe cards are referred to as low coercivity (LoCo) and high coercivity (HiCo) magnetic oxides. Coercivity measures how difficult it is to magnetize or demagnetize the stripe and is measured in oersteds. Low coercivity magnetic stripes are typically 300 oersteds and high coercivity magnetic stripes are above 2700 oersteds. A high coercivity magnetic stripe requires about three times more energy to encode or erase than does a low coercivity magnetic stripe. Many transaction card applications have gone to HiCo magnetic stripes because it is much harder to accidentally erase the encoded data than on LoCo magnetic stripes. This provides greater durability and readability of the encoded data in use for many applications.
The encoding of the magnetic stripe on a transaction card typically follows standard digital recording techniques but is again optimized for transaction card applications. The encoded data takes the form of zones of magnetization in the magnetic stripe with alternate magnetic polarities. The north and south poles, of the magnetized zones alternate in direction providing an encoding technique that can represent the binary “zeroes” and “ones” of a binary digital code.
The standard encoding technique for the magnetic stripe on a transaction card is the F2F (Aiken double frequency) code where a binary zero is represented by a long magnetized zone and a binary one is represented by two magnetized zones, each one half the length of the zero—a long magnetized zone. The exact length of these zones of magnetization is determined by how much data needs to be recorded on the magnetic stripe. For example Track 2 data is encoded at 75 bits per inch or 75 long zero zones per inch—International Standards Organization (ISO) specifications 7811-2/6. That equates to 0.01333 inches in length for the zero magnetized zone. The binary one would then be two zones of one half that length or 0.00666 inches in length. Other lengths can be obtained for different data densities such as the 210 bits per inch used in Track 1 and Track 2 of the magnetic stripe.
Reading the encoded data in the magnetic stripe is accomplished by capturing the magnetic flux field extending from the magnetized zones in the stripe by a magnetic read head. The read head converts the changing magnetic flux in the coil of the read head to a voltage pattern mirroring the magnetization zones of the encoded data. The voltage pattern can then be translated by the decoding electronics into the binary zeroes and ones of the data as is well known in the industry.
A magnetic stripe encoder consists of a magnetic write head and an electronic current drive circuit capable of magnetizing the magnetic oxide in the stripe to full magnetization (saturation). The encoding current in the write head is capable of alternating direction thereby producing alternating zones of magnetization direction in the stripe that will form the data encoding of the magnetic stripe. Transaction cards typically have their stripes encoded with account and/or other information in commercial magnetic stripe encoders prior to delivery to the consumer.
The process of magnetic tape application to transaction cards, the encoding of the magnetic stripe and the reading of the encoded data in the magnetic stripe at point of use has been a reliable and cost effective method for portable personal data storage for financial, ID and other transaction card based applications. However, the relative ease of reading and encoding or re-encoding of the magnetic stripe data has made the magnetic stripe transaction card subject to counterfeiting, copying the data to one or more cards (often referred to as “skimming”) and other fraud abuses. Skimming fraud alone is growing around the world and has reached financial dollar losses that call for immediate solutions.
There are many security problems with conventional transaction cards. For one, the stripe is static and is not encrypted, allowing transaction card thieves to “steal”, in the virtual sense, the data from the stripe and use it for unauthorized transactions. This is because with conventional magnetic stripe cards the transaction data is “exposed”, i.e. not encrypted. If “picked off”, the data can be used indistinguishably in a counterfeit transaction card. As such, a counterfeit transaction card can be freely used by a thief until it is cancelled.
The skimming and counterfeiting problem has been partially addressed by MagTek Incorporated with its MagnePrint technology. MagnePrint® is a card security technology that can detect “skimmed” or magnetically altered counterfeit cards. Just as fingerprints can uniquely identify human beings, MagnePrint® can uniquely identify magstripe cards. MagnePrint® technology was discovered at Washington University in St. Louis, Mo., USA. MagTek refined the technology, to bring it to practical use, and has an exclusive license to market this technology. However, MagnePrint technology requires modified card readers for its implementation, which would render obsolete millions of legacy card readers.
In addition to a lack of security, conventional transaction cards are also quite limited in storage capacity. That is, conventional cards are limited to their stripe for storage. As such, conventional cards are not electronic cards, e.g. cards with embedded electronics such as an on-board processor and/or digital memory, and are very limited in their functionality.
An example of an electronic card is the so-called “Smart Card” , which includes both an on-board processor and digital memory. By providing an on-board electronics, a Smart Card can implement security protocols such as encryption, store large amounts of user information, etc.
A common standard for Smart Cards is referred to as the ISO 7816 standard. With this protocol, a Smart Card is provided with an electrical interface including a number of electrically conductive and externally accessible contact pads which are coupled to an embedded secure processor. The Smart Card is inserted into a Smart Card reader which makes electrical contact with the contact pads to provide power to and communications with the secure processor. Smart Cards, however, are not provided with embedded power, e.g. a battery. Smart cards can also include a conventional stripe which, in the prior art, does not in any way interact with the secure processor.
Smart cards using memory chips and microprocessor chips were first introduced to provide increased data storage and to guard against some of the types of fraud found in magnetic stripe transaction cards. The Smart Cards do reduce some types of fraud but the cards are much more expensive than a magnetic stripe transaction card and the magnetic stripe readers at the point-of-transaction had to be replaced with readers that could read the data storage chip and the magnetic stripe. These cost factors and inertia in changing the existing infrastructure built up around the magnetic stripe transaction card systems and applications (e.g. “legacy” card readers) have prevented the rapid and more general acceptance of Smart Cards in the United States.
Another factor in the slow acceptance of Smart Cards in the United States, has been the lack of visible benefits to the end user or consumer. The consumer is just as content to use the magnetic stripe as to use the chip to complete a transaction.
While broadly adopted abroad, Smart Cards have not been extensively adopted in the U.S., as noted above. As noted above, a major reason for this is the investment made by millions of merchants in legacy card readers, which cannot communicate with the secure processors of Smart Cards. Also, Smart Cards conforming to the ISO 7816 standard suffer from their own limitations, including severely restricted I/O, an inability to provide “smart” transactions with legacy card readers, etc.
Another limitation of smart cards in general is that they lack the ability to interact with a user when they are not in contact with a smart card reader. This limitation is due to the fact that the smart card of the prior art does not have an on-board power supply. Thus the electronic components lie dormant and do not allow for interaction. This limitation prevents a myriad of features, such as account selection, or a security feature to lock the card, etc.
Another suggested approach, not yet in use, uses a general processor and a stripe emulator which work with legacy card readers. As used here, the term “stripe emulator” will refer to a transaction card where data transmitted to a legacy card reader is under the control of the general processor. This approach will be referred to herein as an “emulator card”, which is one form of an electronic card.
Emulator cards potentially have a number of distinct advantages over conventional credit cards. For one, a single card can emulate a number of different transaction cards, greatly reducing the bulk in one's wallet. For example, an emulator card can emulate a Visa card, a MasterCard, and an ATM card. Also, since the emulator card includes a processor, it is possible to implement additional functionality, such as security functions.
However, emulator cards, too, have their limitations. For one, since general processors are used the security level of the card is reduced. For example, a hacker could potentially obtain data stored in unsecured electronic memory. Also, emulator cards do not address Smart Card protocols, as they are designed to work with legacy card readers. For example, as with conventional credit cards, data flows from the emulator card to the legacy card reader, and not vice versa. Still further, the information that can be provided by the emulator card is limited to the amount of information that a conventional stripe can hold and that a legacy card reader can read.
The need for fraud reduction with a versatile and inexpensively manufactured electronic card is urgent. In the U.S., fraud is tending to cover from 7.5 to 12 basis points in credit card transactions, and skimming alone is estimated to cost $8 billion dollars in 2005. Internationally, the need is even more dire, with fraud tending from 25 to 40 basis points, with 60 percent of that being due to skimming. Nevertheless, merchants in the United States and elsewhere are reluctant to invest the resources necessary to change all of their current magnetic-card transaction equipment for various reasons, including cost, inconvenience, disruption and lack of reliability.
There are other uses for electronic cards other than for financial transactions. For example, electronic cards have been used for security purposes to allow, for example, personnel to high security areas of a building (“access control”). Electronic cards can therefore be used for a variety of purposes where the identity and/or status of the bearer needs to be verified by a physical card or “token.”
Electronic cards, as noted above, tend to be relatively expensive compared to conventional, non-electronic, magnetic stripe cards. This is due, in part, to the cost of the electronic components and is due, in part, to the complexity of manufacture of electronic cards. For example, care must be taken during lamination of electronic cards that the heat and/or pressure do not damage the sensitive electronic components. Also, electronic cards should remain thin, flexible and preferably of the same dimensions as conventional cards. As another example, stripe emulators tend to be difficult to design and manufacture such that they work with legacy readers.
Furthermore, powering the electronic circuitry of electronic cards tends to be problematical. For example, Smart Cards are powered by their readers, limiting their usefulness in non-contact applications. A good solution for powering ubiquitous electronic cards has not been found in the prior art.
These and other limitations of the prior art will become apparent to those of skill in the art upon a reading of the following descriptions and a study of the several figures of the drawing.
A number of non-limiting examples of electronic cards which address aforementioned problems and limitations of prior transaction cards and electronic cards are presented. As will be apparent to those skilled in the art, the methods and apparatus as disclosed herein are applicable to a wide variety of problems which require or could be improved with improved electronic cards.
In an embodiment, set forth by way of example rather than limitation, an electronic card includes a thin, flat digital processor, a thin, flat electrochemical battery, a communications port, a first flexible cover, and a second flexible cover. The digital processor preferably has a first substantially planar surface and a substantially opposing second substantially planar surface, wherein at least one of the first surface, the second surface, and a cross-section of the processor define a maximum surface area. The battery preferably has a first substantially planar surface and a substantially opposing second substantially planar surface, wherein at least one of the first surface, the second surface, and a cross-section of the processor define a maximum surface area, the battery being positioned substantially co-planar with the processor and capable of powering the processor. The communications port is coupled to the processor. Each of the first flexible cover and the opposing second flexible cover have a surface area greater than the combined maximum surface areas of the digital processor and the battery. The processor and the battery are sandwiched between and enclosed by the first flexible cover and the second flexible cover.
In an exemplary embodiment, the electronic card includes a flexible circuit board. In another exemplary embodiment at least one of the first cover and the second cover are contoured to fit over the circuit board, processor and battery. In another exemplary embodiment, one or more switches are coupled to the circuit board. In another exemplary embodiment, one or more indicators are coupled to the circuit board. In another exemplary embodiment, the processor is coupled to the circuit board in a flip-chip fashion. In another exemplary embodiment, the processor is coupled to the circuit board with bonded wire. In another exemplary embodiment, the bonded wire has a low loop height. In another exemplary embodiment, the processor is encapsulated against the printed circuit board. In another exemplary embodiment, the battery includes two or more batteries. In another exemplary embodiment, the battery is not rechargeable. In another exemplary embodiment, the battery is rechargeable. In another exemplary embodiment, the battery includes a rechargeable battery and a non-rechargeable battery. In another exemplary embodiment, the battery is part of a power supply including a power filter.
In an embodiment, set forth by way of example rather than limitation, a method for making an electronic card includes making a flexible printed circuit board, attaching at least one processor to the printed circuit board, coupling at least one battery to the printed circuit board, encapsulating at least the one processor, making a top cover and a bottom cover; and sandwiching the printed circuit board, the processor and the battery between the top cover and the bottom cover.
In an embodiment, set forth by way of example rather than limitation, an enhanced Smart Card includes a card body provided with an externally accessible card interface including a signal port, a power port, and a ground port, a secure processor disposed at least partially within the card body and coupled to the signal port, the power port, and the ground port, a general processor disposed at least partially within the card body, the general processor being coupled to a power source disposed at least partially within the card body and being operative to provide power to and communicate with the secure processor when the secure processor is being used in an enhanced Smart Card mode; and a non-contact communications port coupled to at least one of the secure processor and the general processor.
In an embodiment, set forth by way of example rather than limitation, a secure transaction card includes a card body, a secure processor disposed at least partially within the card body, a general processor disposed at least partially within the card body, a power source disposed at least partially within the card body; and a non-contact communications port coupled to at least one of the secure processor and the general processor.
In an embodiment, set forth by way of example rather than limitation, a swipe emulating broadcaster system includes a coil having an elongated core material and a winding having a plurality of turns around the core material; and a signal generator having a broadcaster driver signal coupled to the coil such that the coil provides a dynamic magnetic field which emulates the swiping of a magnetic stripe transaction card past a read head of a card reader.
In an exemplary embodiment, the signal generator includes a processor having a digital output and a signal processing circuit which converts the digital output to the broadcaster driver signal. In another exemplary embodiment, the signal generator is a digital signal generator. In another exemplary embodiment, the coil is one of a plurality of coils. In another exemplary embodiment, at least one of the plurality of coils is a track coil. In another exemplary embodiment, at least one of the plurality of coils is a cancellation coil. In another exemplary embodiment, the coil includes a wire wound around the core. In another exemplary embodiment, the coil includes a wire formed around the core by a process including at least the deposition of conductive material and the etching of the conductive material.
In an embodiment, set forth by way of example rather than limitation, a method for creating a low-loop bonding for thin profile applications includes attaching a first surface of a fabricated semiconductor die to a first surface of a substrate having a plurality of substrate contact pads, such that a second surface of the die which opposes the first surface is exposed to provide access to a plurality of die contact pads, wire bonding a first end of a wire to a substrate contact pad; and wire bonding a second end of the wire to a die contact pad, such that the loop height of the wire is no greater that 5 mils above the second surface of the die, and no greater than 20 mils above the first surface of the substrate.
These and other embodiments, aspects and advantages will become apparent to those of skill in the art upon a reading of the following descriptions and a study of the various figures of the drawing.
Several exemplary embodiments will now be described with reference to the drawings, wherein like components are provided with like reference numerals. The exemplary embodiments are intended to illustrate, but not to limit. The drawings include the following figures:
As noted, there are a great many applications for electronic cards. One of many applications is to provide security for financial transactions, e.g. financial transactions using transactions cards such as credit cards and debit cards. In the following exemplary embodiments, particular emphasis will be placed on transaction card security, with the understanding that other uses for enhanced electronic security, such as, but not limited to, access control, are within the true spirit and scope of the invention.
The exemplary electronic card 10 has a front surface 12 which is provided with an electrical interface 16. This is one non-limiting example of a communication port for the electronic card 10. In other embodiments, the interface 16 may be eliminated, or additional communication ports may be provided.
The illustrated electrical interface 16 includes a number of contact pads which, in this example, are formed in a configuration which is compliant with the International Standards Organization “Smart Card” standard ISO 7816, incorporated herein by reference. In this exemplary embodiment, the electronic card is usable as a legacy mode Smart Card. Also shown on the front surface 12 is an institution identifier 18, an institution number 20, an account number 22, and a client name 24. The account number is preferably embossed on the electronic card 10 to provide raised numerals for credit card imprint machines.
The electronic card may also have, for example, an on/off button 28, an “on” indicator 30, and an “off” indicator 32. In this exemplary embodiment, “on” indicator 30 may be a green LED and the “off” indicator 32 may be a red LED. Also seen on the exemplary card back 14 are a plurality of account interfaces 34. Each account interface 34 preferably has account indicator LED 36 and an account selector switch 38. Each account interface 34 may also have, for example, printed information identifying the account and expiration date. Back surface 14 also has, in this example, instructions 40, an institution identifier 41, a signature box 42, and various other printed information.
Secure processor 44 is preferably a commercially available Smart Card chip which has various tamper resistant properties such as a secure cryptographic function and tamper resistant storage 46. An exemplary embodiment of secure processor 44, given by way of example and not limitation, is a P8WE6032 processor manufactured by Phillips of Germany. Similar devices are manufactured by Hitachi, Infineon, Toshiba, ST and others. As noted previously, in this example secure processor 44 is connected electrically to the interface 16 by a bus 48.
General processor 52 is, in this example, also connected to the bus 48 and, therefore, to both the secure processor 44 and the interface 16. Additionally, in this example, the general processor 52 is coupled to the secure processor 44 by an “I/O 2” line 50. In the current exemplary embodiment, memory 54 is coupled to the general processor 52. General processor 52 is also coupled, in this example, to power source 56, display 58, switches 60, and other I/O 62.
In an alternate embodiment, general processor 52 communicates with the secure processor 44 in an IS07816 compliant mode over the bus 48. In such an embodiment, no other connection to the secure processor is required (e.g. the I/O 2 line 50 connection can be omitted).
Power source 56 is preferably an electrochemical battery disposed within the card body 11. It may be either a non-rechargeable battery or a rechargeable battery. If power source 56 is a non-rechargeable battery, it should have sufficient capacity to power the electronic card 10 for its useful life. If the power source 56 is rechargeable, the electronic card 10 may be used indefinitely. A rechargeable battery may, for example, be recharged through interface 16, by magnetic induction (e.g. through an induction coil or the broadcaster coils), a photovoltaic cell embedded in body 11, a piezoelectric material embedded in the electronic card 10, another electrical connector, kinetic recharging mechanisms (e.g. magnets and coils), or other suitable mechanisms. For example, in some situations a rectification of ambient RF energy may provide sufficient energy to power the electronic card 10, recharge a battery, or store supplemental charge in, for example, a capacitor.
Alternative exemplary embodiments include both a primary and a secondary battery disposed within the card body. For example, a non-rechargeable battery could serve as a primary battery and a rechargeable battery could serve as a secondary battery, or vice versa. These exemplary embodiments are given by way of example and not limitation.
Since the power source 56 is embedded in the electronic card 10, it must be thin. This is because the electronic card 10, for many applications, must be able to bend within certain ranges. For example, an electronic card 10 used for transaction card applications must conform to the ISO 7810 standard, which is 85.60 mm (˜3370 mils) wide, 53.98 mm (˜2125 mils) tall, and 0.76 mm (˜30 mils) thick. This is often referred to as the “CR80” format, which is roughly 3˝″ by 2″, and fits well into a standard wallet. However, other formats can also be used which are larger, small, or differently configured than the CR80 format. By way of non-limiting example, an electronic card of smaller than CR80 dimensions can be made to fit on, for example, a keychain.
The cards must be somewhat flexible so that they can be used in, for example, insertion-type legacy card readers, so it is also preferable that the power source be somewhat flexible if it is relatively large in surface area. However, flexibility is not a problem if the battery is relatively small in surface area, or if several smaller batteries are coupled together to form the power source 56. Also, it is important that the power source 56 can withstand heat and/or pressure if, for example, heat and/or pressure lamination techniques are used to manufacture the electronic card 10.
Examples of suitable batteries are manufactured by Varta Microbattery of Ellwangen, Germany and Solicore of Lakeland, Fla. The batteries are preferably electrochemical in nature, although other types of batteries or capacitive storage devices can also be used. Suitable electrochemical batteries can include, by way of example but not limitation, Li-polymer, Ni-MH, lithium, lithium-ion, alkaline, etc.
General processor 52 may be, for example, a PIC 16 or PIC 18 microcontroller. In an alternative embodiment, general processor 52 may comprise an ASIC chip. In still further embodiments, general processor may be any form of logic (e.g. a state machine, analog processor, etc.) which performs the desired processing functions.
Display 58 may include, for example, LED devices as disclosed previously. As another non-limiting example, display 58 is may comprise an LCD display. The LCD display is preferably flexible if it is of a relatively large surface area. Switches 60 can be any form of electrical switches or devices which provides the functionality of switches to provide inputs or controls for the electronic card 10. The processor 52 may, for example, provide software debouncing algorithms with respect to such switches. Other I/O 62 may comprise any number of alternative I/O subsystems. These may include, by way of example and not limitation, audio, tactile, RF, IR, optical, keyboard, biometric I/O or other I/O. The secure processor 44 may also provide I/O by RF or IR in accordance with ISO 7816 standards.
Also coupled to general processor 52, in this exemplary embodiment, is magnetic stripe emulator 64, which allows the electronic card 10 to be used in a mode which emulates a magnetic stripe card of the prior art. Magnetic stripe emulator 64, in this non-limiting example, is comprised of a buffering circuit 66, which converts digital output from general processor 52 into a wave form appropriate for magnetic stripe emulation. In this exemplary embodiment, buffering circuit 66 includes a conversion circuit which is typically implemented as an RC network. Along with the broadcaster, the RC network forms an RCL network to condition the waveform. RC networks and their equivalents are well known to those skilled in the art.
In this example, magnetic stripe emulator 64 further includes a broadcaster 68. As used herein, the term “broadcaster” refers to one or more inductive coils which are used to “broadcast” a fluctuating magnetic signal which emulates the movement (“swipe”) of a transaction card's stripe past the read head of a magnetic card reader.
Broadcaster 68 may be electrically coupled to buffering circuit 66 and preferably receives two tracks of signal which are converted by broadcaster 68 into magnetic impulses for magnetic stripe emulation. Alternative embodiments include one, three, four or more tracks. Broadcaster 68 may include one or more electrical coils to convert electrical signal into magnetic impulses.
Broadcaster 68 of this example may further include one or more sensors 70, which are electrically coupled to general processor 52. These sensors are used to signal to general processor 52 that the physical act of swiping the card body 10 through a legacy card reader has commenced. Sensors 70 also communicate to general processor 52 when contact is lost with the magnetic stripe reader 72, which receives and interprets magnetic flux impulses from the broadcaster.
As noted previously, the electronic card 10 of this example includes an electrical interface 16. In this example, electrical connectors 16 are used in a manner compliant with ISO 7816 to communicate with an ISO 7816 reader device 74. That is, electronic card 10, in this example, can be used as a legacy Smart Card or as a legacy magnetic stripe transaction card.
When used in a legacy Smart Card mode, secure processor 44 is powered by bus 48 from a Smart Card reader device 74. The reader device 74 can be used to program and personalize secure processor 44 with various information including, by way of example and not limitation, firmware code, account numbers, cryptographic keys, PIN numbers, etc. This information, once loaded into secure processor 44, prepares secure processor 44 for an operational mode which no longer requires the use of reader device 74.
In this “independent” mode, secure processor 44 communicates with general processor 52 and provides services such as cryptographic functions and the dynamic generation of authentication information which is used to communicate via general processor 52 and magnetic stripe emulator 64 with magnetic stripe reader 72. Also in this example, the authentication code may be used only once for a single transaction. Subsequent transactions require new authentication codes to be generated. Secure processor 44 can also send account information and/or DACs via RF and IR.
In an alternative embodiment, the card body 10 continues to be used with reader device 74 and also with magnetic stripe reader device 72. In this alternate embodiment, the card detects the mode in which it is being used and automatically switches the usage of bus 48 appropriately for the detected mode of operation. This is achieved in optional bus arbitrator 76. In other embodiments, there is no bus arbitrator 76. Optional bus arbitrator 76 can detect when it is being used with reader device 74 because power is provided by reader device 74 via electrical connectors 16 to bus 48. Similarly, optional bus arbitrator 76 can detect that power is being provided by general processor 52 and switch to the corresponding mode of operation, which services general processor 52 and the various I/O devices connected thereto. In yet another alternative embodiment, optional bus arbitrator 76 allows for the dynamic communication of both general processor 52 and secure processor 44 with each other respectively, and with reader device 74. This requires bus arbitration logic which is well known to those skilled in the art. In a further alterative embodiment, general processor 52 is interposed between secure processor 44 and electrical connectors 16. In this alternative embodiment, general processor 52 acts as a “go-between” or a “front end” for secure processor 44.
With continuing reference to
Non-contact communications port 77 can be a radio frequency communications port, IR communications port, or any other form of communications which does not require physical contact. Of course other embodiments may be provided with contact communications ports, such as communications port 16 and broadcaster. That is, these embodiments are described by way of example and not limitation.
A standard for radio frequency (“RF”) communication for Smart Card communications is ISO/IEC 14443, dated 2001, incorporated herein by reference. It includes an antenna and RF driver characteristics and defines two types of contactless cards (“A” and “B”), allows for communications at distances up to 10 cm. There have been proposals for ISO 14443 types C, D, E and F that have yet to complete the standards process. An alternative standard for contactless smart cards is ISO 15693, which allows communications at distances up to 50 cm.
Secure processors 44 as described above are commercially available from a variety of sources including Philips, Hitachi, Infineon, Toshiba, ST, and others. A suitable secure processor 44 for use in the disclosed exemplary embodiment is the model P8WE6032 processor made by Philips of Germany. In certain alternate embodiments, the secure processor 44 can be replaced by a general processor.
In this exemplary embodiment, two electrochemical batteries 121A and 121 B are shown. As noted, batteries of suitable chemistries and dimensions are commercially available from, for example, Varta Microbattery GmbH. In this example, non-rechargeable battery 121A serves as a primary battery, while rechargeable battery 121B serves as a secondary battery. Battery 121B may be coupled to a recharging apparatus 122, which is shown here as an RF power source. Of course, the induced current is rectified prior to being applied to the battery 121B. As noted above, there are a number of other suitable recharging apparatus that will be apparent to those skilled in the art.
Preferably, capacitor assembly 124 is provided in order to provide a smooth source of power without peaks or power dropouts. The capacitor assembly can include one or more capacitors, as illustrated. Capacitor assembly 124 may also be used to smooth the power from a rectifier which may be present in recharging apparatus 122. Battery 121A, battery 121B, recharging apparatus 122, and capacitor assembly 124 are all part of power source 56 of
One or more capacitors, such as the capacitor assembly 124, can also be used as a charge storage device. That is, “super capacitor” having a sufficiently high capacitance can significantly supplement the current provided by the electrochemical battery in certain embodiments. For example, a capacitance range of about 1 uF+−10% @ 6.3v is suitable in some embodiments to serve as a super capacitor. This relatively large capacitor assembly 124 can be conveniently accomplished, for example, by using ten 0.1 uF capacitors connected parallel in order to reduce the size and height of the capacitor.
With continuing reference to
General processor 52 is, in the present example, connected to a number of switches including on/off switch 28 and account selector switches 38. Also connected to general processor 52 are a number of light emitting diodes (“LEDs”) including a “power-on” indicator 30, a “power-off” indicator 32, and “account-on” indicators 36. These various LEDs and switches comprise a human/computer interface with the electronic card 10. Of course, there are many alternates or additions to the electronic card 10 and to devices communicating with the electronic card 10 which are also helpful human/computer interfaces. By way of further example but not limitation, the electronic card 10 may include an LCD screen (with or without a touch panel), audio I/O, voice recognition, and various other alternatives that will be apparent to those of skill in the art.
In this example, an RC buffering circuit 66 is coupled to general processor 52 and converts (in conjunction with the broadcaster 68 and/or other components) square wave type signals emanating from general processor 52 into wave forms which emulate the magnetic signals (“dynamic magnetic flux”) provided by a magnetic stripe transaction card passing through a reader. Wave forms are communicated electrically to broadcaster 68 which converts the electrical signals into a dynamic magnetic field which simulates the passing of a card with a magnetic stripe through a magnetic stripe reader. The electronic card 10 may be moving or stationary, and the varying magnetic field broadcasted by the broadcaster 68 will emulate the varying magnetic field created by a magnetic stripe of a conventional transaction card moving past a read head. The magnetic signal created by the broadcaster therefore tends to be substantially uniform along its length.
Sensors 70 provide signals to general processor 52 to indicate that the card has made physical contact with the reader. Sensors 70 may take various forms including physical switches, pressure sensors or other alternatives which will be apparent to those of skill in the art. Broadcaster 68 achieves its waveform subsequent to the activation of one or more sensors 70.
Four exemplary coils 128, 130, 132 and 134 are shown in
Since the magnetic field from the track two coil 130 may interfere with the magnetic field of the track one coil 128, the track two cancellation coil 134 is provided to “cancel” this “cross talk” effect. By “cancel” it is meant that the cross talk is at least significantly reduced. The magnetic field generated by the track two cancellation coil 134 is the inverse of that of the track two coil 130 thus reduces the effect of the track two coil 130 magnetic field of track one coil 128. Similarly, the track two coil 130 is, in this example, equidistant from and interposed between track one coil 128 and track one cancellation coil 132. Reduction of the cross talk effect of the track one coil 128 is provided by the track one cancellation coil 132. The broadcaster coils 128-134 and sensors 70 comprise broadcaster 68 in this exemplary embodiment.
In an alternative embodiment, cancellation coils 134 and 132 are not provided, but rather, the electrical signals provided to these coils are modified in such a manner that the interfering magnetic fields provide appropriate magnetic input to magnetic stripe reader device 72. This may be achieved through the use of an ASIC, digital signal processor (DSP), or by other instrumentalities. Optionally, the positions of these two broadcaster coils 126 may be offset from their positions in the previously described embodiment to provide the appropriate effect. Alternatively, cancellation can be achieved through mechanical shielding with nano materials that could shield the broadcast data between the two adjacent coils. These various exemplary embodiments are given by way of example and not limitation. Alternatives to the embodiments shown in
Furthermore, a digitally synthesized signal may be applied to the broadcaster 68 which could reduce or eliminate the need for signal conditioning circuitry such as the RC circuit and/or for the need for cancellation coils. The digitally synthesized signal may be accomplished, for example, in the general processor 52, in a DSP, or in other circuitry, as will be appreciated by those skilled in the art.
As noted previously, the thickness (or height, when the card is taken in cross-section) for an electronic card 10 made to ISO 7810 standard dimensions is only about 30 mils. Therefore, it is important that the various internal components of the electronic card 10 be thin, flat, and substantially coplanar. By way of example and not limitation, the digital processor 52 should be thin and flat, with a first substantially planar surface and a substantially opposing second substantially planar surface. It should also define a first maximum surface area. By way of further example but not limitation, the electrochemical battery 121 should have a first substantially planar surface and as substantially opposing second substantially planar surface, and should define a second maximum surface area. A theoretical plane through the center of the digital processor 52 should be substantially coplanar with a theoretical plane through the center of battery 121 so that the desired thinness of the electronic card 10 may be achieved.
The word “substantially” is used herein to mean approximately. For example, a substantially planar surface is at least approximately flat. Minor imperfections, steps, bumps or curvatures to the major surfaces are still considered to be “substantially planar”, and do not have to be applied to the entire surface. “Substantially opposing surfaces” are generally facing each other and are at least approximately parallel.
By “substantially co-planar” it is meant that theoretical center planes are at least close together and approximately parallel. Of course, the center plane of processor 52 could be above or below the center plane of battery 121 and the two components could still be considered “substantially co-planar” as long as the desired thinness of the electronic card 10 can be maintained. For example, the processor 52 and battery 121 can still be considered coplanar as long as there is any plane generally parallel to the major surfaces of these components which intersects both of the components. If, for example, the battery 121 is 16 mils high and the processor 52 is 10 mils high in cross section, the center planes of the components could be separated by as much as 8 mils and they would still be considered to be “substantially co-planar.”
PC board 136 may be, for example, a multilayer PC board. For example, the top of the PC board 136 as seen in
With continuing reference to
It is very important to have a low loop-height “d” for the wire 148. Conventional wire bonding techniques bond a wire first to the processor and then to the substrate, resulting in a very high loop height. A high loop height is unacceptable for electronic cards, which must be made very thin. Also, a high loop height creates a reliability problem due to bending and torsional stresses to which the electronic card may be subjected.
In accordance with an aspect of this exemplary embodiment, a reverse bonding process is used where the wire 148 is first attached to the PC board 136 and then attached to the processor 56. This results in a short loop height “d” , which is preferably less than 5 mils and is more preferably 2-4 mils or less. As a result, the total height of the loop is equal to d+D, where “D” is the height of the top surface of the processor 56 above the top surface of the PC board 136. In the present example, the processor die 56 is about 9-10 mils, and the adhesive is about 1-2 mils, resulting in a height D of about 10-12 mils. If the loop height d is in the range of 2-4 mils, the total height of the loop above the top surface of the PC board is in the range of 12-16 mils, in this example.
The low loop height also helps with the aforementioned bending and torsional stresses to which the electronic card may be subjected. For example, with a loop height of preferably less than 5 mils, more preferably less than 4 mils, and most preferably about 2 mils or less, 7-10 grams of pull-strength on the wire can be achieved.
In another embodiment, the processor 56 is attached to the PC board in a flip-chip fashion. Techniques for attaching dies to substrates in a flip-chip fashion are well known to those skilled in the art.
These exemplary embodiments are given by way of example and not limitation. Alternatives for the composition and configuration of broadcaster 68 will be apparent to those of skill in the art. For example, alternative embodiments which do not include cancellation coils 132 and 134 are contemplated as are other alternative embodiments. As another non-limiting example, certain embodiments have only a single track coil.
In an exemplary embodiment, broadcaster core 166 is composed of a material called “HyMu 80”, with favorable magnetic properties, which is commercially available from National Electronic Alloys Inc. A single strand of copper wire 164 is wound around broadcaster core 166 at regularly spaced intervals, e.g. with a constant pitch “P.” In an exemplary embodiment, the pitch of the wire coil is about 4.8 mils. This exemplary embodiment is given by way of example and not limitation, as other pitches and variable pitches are suitable in certain embodiments.
The aforementioned embodiments for the coils teach winding a wire around a ferromagnetic core. In alternate embodiments, the coils can be made in other fashions. For example, coils can be made with various deposition, patterning, and etching techniques. As will be appreciated by those skilled in the art, a ferromagnetic core can be coated with an insulating film, and then coated with a conductive (usually metal) layer of, for example, copper or aluminum or alloys thereof by, by way of example and not limitation, sputtering and nano-sputtering techniques. A mask can then be applied to the conductive layer to define the coil, and portions of the conductive layer can be etched away to provide the windings. The mask can be made photolithographically, by spraying with, for example, ink-jet technologies, or by other techniques well known to those skilled in the art. The etching can be accomplished with an acid which attacks the conductive layer but which is stopped by the insulating film. This method of coil production may have advantages in high-volume manufacturing situations.
For example, a ferromagnetic coil can be prepared and cleaned. An insulating and/or etch stop layer can be applied by a variety of techniques including, but not limited to, dipping, spraying, coating, sputtering, CVD, etc. A metal or other conductive layer can then be applied, again by a variety of techniques including, but not limited to, dipping, spraying, coating, sputtering, CVD, etc. A mask layer can be applied as a photolithographic material, by painting, printing, spraying, stenciling, etc., as will be appreciated by those skilled in the art. The etching of the conductive layer through the mask layer can be accomplished by a variety of techniques including, but not limited to, dipping, spraying, immersing, and plasma etching techniques. The mask layer is then removed, and a passifying layer may be applied to protect the coil assembly.
As will be appreciated by those skilled in the art, there are other ways to produce the effects of the “coils” of the broadcaster. For example, magnetic material can be lithographically sputtered to create the broadcaster coil effect. There are a variety of mass production techniques such as those noted above, by example, which will be apparent to those skilled in the art of semiconductor and micro-machine manufacturing.
In one exemplary alternative embodiment, general processor 52 is comprised of an ASIC chip, which optionally includes one or more other components of exemplary transaction card 10. For example, the ASIC assumes the role of buffering circuit 66 as well as the duties of other components associated with general processor 52 in the previously disclosed embodiments. Further, the ASIC embodiment could, for example, produce adjusted waveforms for track 1 coil 128 and track 2 coil 130 so that it is not necessary to include track 1 cancellation coil 132 or track 2 cancellation coil 134. For example, the ASIC could apply a correction to the amplitude and phase of the waveform of track 1 coil 128 because of the anticipated effect of magnetic flux interference from track 2 coil 130. Likewise, a correction would be applied to the waveform for track 2 coil 130, to cancel the effect of track 1 coil 128.
Note that the corrections applied to the waveform may vary with time because the interference from the opposing broadcaster coil 126 may vary with time (at different parts of the waveform). Thus, the correction constitutes two new waveforms for the two respective broadcaster coils 128 and 130 of this exemplary embodiment. Note also that the correction waveform for a given broadcaster coil 128 will itself cause interference with the opposing broadcaster coil 130, and vice versa.
In some exemplary embodiments, an additional correction is applied to compensate for the effect of the previous correction. In still further exemplary embodiments, one or more additional corrections are applied until the diminishing effect of interference becomes negligible as the series converges. Note that these corrections are performed in a computational manner before the corresponding portions of the waveforms reach the broadcaster 68.
In a further alternative embodiment, the crosstalk cancellation is performed in a linear RC circuit which outputs corrected waveforms to track 1 coil 128 and track 2 coil 130. This RC circuit could be disposed within the exemplary ASIC described above or external to the ASIC. Again, this embodiment is provided by way of example and not limitation.
In a decision step 184, it is determined whether or not the functional test has been passed. If it is not, then, control passes to an operation 186, wherein the problem which causes the failure is determined. Then, in an operation 188, the problem is reworked in an operation 188 and, then, control passes again to programming step 180. If, on the other hand, in decision step 184 it is determined that the functional test is passed, then, an encapsulation process is performed in step 190. Once encapsulation is completed, the first phase of manufacture is completed. The process shown here is exemplary and as will be apparent to those of skill in the art, many alternative embodiments may be used. That is, this process is described by way of example and not limitation.
The above described exemplary manufacturing process, and variants thereof, may be used to a variety of embodiments of transaction card 10. For example, a variant of the manufacturing process uses photolithography techniques well known to those skilled in the art to produce broadcaster 68. This method avoids the use of coil winding, which may save time and money when manufacturing transaction card 10 in large numbers.
Another variant of the process would use the “flip chip” method well known to those skilled in the art to mount one or more technology components such as general processor 52. Optionally, this variant would include the use of an ASIC as general processor 52. This embodiment is given by way of example and not limitation.
An alternative exemplary embodiment of non-contact communication port 77 of
Although various embodiments have been described using specific terms and devices, such description is for illustrative purposes only. The words used are words of description rather than of limitation. It is to be understood that changes and variations may be made by those of ordinary skill in the art without departing from the spirit or the scope of the present invention, which is set forth in the following claims. In addition, it should be understood that aspects of various other embodiments may be interchanged either in whole or in part. It is therefore intended that the claims be interpreted in accordance with the true spirit and scope of the invention without limitation or estoppel.