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Publication numberUS20080036734 A1
Publication typeApplication
Application numberUS 11/882,421
Publication dateFeb 14, 2008
Filing dateAug 1, 2007
Priority dateSep 6, 2005
Also published asUS7671837, US20070052044
Publication number11882421, 882421, US 2008/0036734 A1, US 2008/036734 A1, US 20080036734 A1, US 20080036734A1, US 2008036734 A1, US 2008036734A1, US-A1-20080036734, US-A1-2008036734, US2008/0036734A1, US2008/036734A1, US20080036734 A1, US20080036734A1, US2008036734 A1, US2008036734A1
InventorsLarry Forsblad, Steve Hotelling, Brian Lynch, Benjamin Lyon, Jan Mooisintong, Doug Weber, Steve Zadesky
Original AssigneeApple Computer, Inc.
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Scrolling input arrangements using capacitive sensors on a flexible membrane
US 20080036734 A1
Abstract
Scrolling input arrangements are presented including: a flexible membrane; a number of capacitive sensors mechanically integrated with the flexible membrane, the capacitive sensors radially disposed with respect to a first axis that is perpendicular with respect to the flexible membrane; an integrated circuit mechanically coupled with the flexible membrane and electronically coupled with the capacitive sensors, the integrated circuit configured to process a number of electronic signals from the capacitive sensors to provide a scrolling function; and a connection region on the flexible membrane for electronically coupling the scrolling input arrangement with an electronic device. In some embodiments, the capacitive sensors are configured with a plate element having a first surface area and a trace element having a second surface area such that the first surface area and second surface area comprise a sensor surface area, wherein the sensor surface areas for the capacitive sensors is substantially equal in size.
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Claims(20)
1. A scrolling input arrangement comprising:
a flexible membrane;
a plurality of capacitive sensors mechanically integrated with the flexible membrane, the plurality of capacitive sensors radially disposed with respect to a first axis that is perpendicular with respect to the flexible membrane;
an integrated circuit mechanically coupled with the flexible membrane and electronically coupled with the plurality of capacitive sensors, the integrated circuit configured to process a plurality of electronic signals from the plurality of capacitive sensors to provide a scrolling function; and
a connection region on the flexible membrane for electronically coupling the scrolling input arrangement with an electronic device.
2. The arrangement of claim 1 wherein each of the plurality of capacitive sensors is configured with a plate element having a first surface area and a trace element having a second surface area such that the first surface area and second surface area comprise a sensor surface area, wherein the sensor surface areas for the plurality of capacitive sensors is substantially equal in size.
3. The arrangement of claim 1 wherein the integrated circuit includes logic for calibrating the plurality of capacitive sensors in response to a changing positive temperature gradient.
4. The arrangement of claim 3 wherein the changing positive temperature gradient is approximately 4 C./ms within a range of approximately 0 C. to 60 C.
5. The arrangement of claim 2 further comprising:
a plurality of switches mechanically integrated with the flexible membrane, the plurality of switches configured for providing a plurality of selection functions wherein at least one of the plurality of switches is approximately co-located with the first axis.
6. The arrangement of claim 1 wherein the flexible membrane is a polyimide film.
7. The arrangement of claim 6 wherein the flexible membrane has a thickness of approximately 0.21 millimeters.
8. The arrangement of claim 6 wherein the flexible membrane is further configured with a plurality of anti-rotation elements for securing the flexible membrane against a rotational force.
9. The arrangement of claim 1 wherein the plurality of capacitive sensors includes at least 16 sensors.
10. A low-profile scrolling input assembly comprising:
a scrolling input arrangement for providing a scrolling function, the scrolling input arrangement having a top surface and a bottom surface, the scrolling input arrangement comprising,
a flexible membrane;
a plurality of capacitive sensors mechanically integrated with the flexible membrane, the plurality of capacitive sensors radially disposed with respect to a first axis that is perpendicular with respect to the flexible membrane;
an integrated circuit mechanically coupled with the flexible membrane, the integrated circuit electronically coupled with the plurality of capacitive sensors, the integrated circuit configured to process a plurality of electronic signals from the plurality of capacitive sensors to provide a scrolling function;
a connection region on the flexible membrane for electronically coupling the integrated circuit with a device;
a backing plate for providing mechanical support for the scrolling input arrangement, the backing plate mechanically coupled with the bottom surface; and
a cover plate for providing protecting the top surface, the cover plate configured to provide a low-friction surface to receive a user input.
11. The assembly of claim 10 further comprising:
a plurality of switches mechanically integrated with the flexible membrane, the plurality of switches configured for providing a plurality of selection functions.
12. The assembly of claim 11 wherein at least one of the plurality of switches is approximately co-located with the first axis.
13. The assembly of claim 11 wherein the backing plate further comprises a plurality of actuator nubs for actuating the plurality of switches.
14. The assembly of claim 10 wherein the cover plate further comprises a plurality of actuator nubs for actuating a plurality of switches mechanically integrated with the flexible membrane.
15. The assembly of claim 10 wherein the integrated circuit includes logic for calibrating the plurality of capacitive sensors in response to a changing positive temperature gradient.
16. The assembly of claim 15 wherein the changing positive temperature gradient is approximately 4 C./ms within a range of approximately 0 C. to 60 C.
17. The assembly of claim 10 further comprising a plurality of anti-rotation elements for securing the assembly against a rotational force.
18. A method of calibrating a plurality of capacitive sensors in response to a changing positive temperature gradient, comprising:
establishing a baseline, the baseline comprising a first minimum function of a signal from each of the plurality of capacitive sensors;
scanning the plurality capacitive sensors; and
if more than eight of the plurality of capacitive sensors exceeds a threshold value,
determining a thermal drift of the plurality of capacitive sensors, the thermal drift corresponding to a second minimum function of a signal from each of the plurality of capacitive sensors, and
for each of the plurality of capacitive sensors, calculating an updated baseline based on the baseline and the thermal drift such that the plurality of capacitive sensors is calibrated.
19. The method of claim 18 wherein the threshold value is selected to avoid a noise floor of the plurality of capacitive sensors.
20. The method of claim 18 wherein the scanning the plurality of capacitive sensors frequency is conducted at a frequency of approximately three megahertz.
Description
    PRIORITY CLAIM
  • [0001]
    This application is a Continuation of application Ser. No. 11/355,022, filed Feb. 14, 2006, which claims priority under the provisions of 35 USC 119 based upon U.S. Provisional Application No. 60/714,609, filed on Sep. 6, 2005.
  • BACKGROUND
  • [0002]
    As modern electronic devices have continued to evolve, size reduction has become a preeminent design consideration. Indeed, shrinking device profiles have made pocket electronics possible while preserving robust processing capability. Much progress has been made in shrinking electronic components like integrated circuits. However, mechanical support systems have sometimes lagged behind electronic advances. At least one reason for this lag is that many mechanical structures are limited by strength to weight considerations. Thus, while a miniaturized circuit may consume ever shrinking profiles, a mechanical structure may be limited to a minimum size in order to achieve structural stability. In some examples, structural stability may include unwanted inefficiencies.
  • [0003]
    For example, FIG. 1 is an illustrative cross-sectional representation of a scrolling device portion 100. Embodiments of this device are described in detail in U.S. patent application Ser. No. 10/188,182 entitled, “TOUCH PAD HANDHELD DEVICE,” and in U.S. patent application Ser. No. 10/643,256 entitled, “MOVABLE TOUCH PAD WITH ADDED FUNCTIONALITY,” which are hereby incorporated by reference. Scrolling device portion 100 includes a cover 104 that provides a protection for the device. An adhesive layer 108 mechanically couples cover 104 with printed circuit board (PCB) 112. PCB 112 may provide structural support for electronic components like, for example, a capacitive sensor (not shown), an integrated circuit 128, a switch 120 and a connection pad 116. PCB's 112 structural rigidity provides at least some durability to the device, but its use is not without some inherent disadvantages.
  • [0004]
    For example, PCB's may be limited to a minimum thickness. Minimum thickness is due to structural requirements that may, in some examples, be unavoidable. Further, because a PCB is rigid, applications may, in some examples, require that features like integrated circuit 128, switch 120, and connection pad 116 be co-located with the PCB. Co-location requirements may add to the device stack height further limiting size reductions. Still further, co-location of associated electronic components, like a switch, for example, may ultimately lead to device failure due to cracked soldering or components as a result of stresses imparted on the PCB during switch cycling. Still further, PCB rigidity may result in some loss of tactile responsiveness of an electronic component like a switch, for example. Therefore scrolling input arrangements using capacitive sensors on a flexible membrane are presented herein.
  • [0005]
    As may also be appreciated, capacitive sensors such as those described above generally may respond undesirably in rapidly changing temperature conditions. For example, in a rapidly heating environment, both the environment as well as an input pointer such as a finger may cause an increase in capacitance signals on sensors. In current designs, if recalibration is conducted while a finger is present, the unit may “calibrate out” the finger. Thus, either the unit remains with an incorrect calibration or it does not respond to the finger. Thus, methods of calibrating a plurality of capacitive sensors in response to rapidly changing positive temperature gradients are presented herein.
  • SUMMARY
  • [0006]
    The following presents a simplified summary of some embodiments of the invention in order to provide a basic understanding of the invention. This summary is not an extensive overview of the invention. It is not intended to identify key/critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some embodiments of the invention in a simplified form as a prelude to the more detailed description that is presented below.
  • [0007]
    Scrolling input arrangements are presented including: a flexible membrane; a number of capacitive sensors mechanically integrated with the flexible membrane, the capacitive sensors radially disposed with respect to a first axis that is perpendicular with respect to the flexible membrane; an integrated circuit mechanically coupled with the flexible membrane and electronically coupled with the capacitive sensors, the integrated circuit configured to process a number of electronic signals from the capacitive sensors to provide a scrolling function; and a connection region on the flexible membrane for electronically coupling the scrolling input arrangement with an electronic device. In some embodiments, the capacitive sensors are configured with a plate element having a first surface area and a trace element having a second surface area such that the first surface area and second surface area comprise a sensor surface area, wherein the sensor surface areas for the capacitive sensors is substantially equal in size. In some embodiments, the integrated circuit includes logic for calibrating the plurality of capacitive sensors in response to a changing positive temperature gradient. In some embodiments, the changing positive temperature gradient is approximately 4 C./ms within a range of approximately 0 C. to 60 C. In some embodiments, the arrangement further includes: a number of switches mechanically integrated with the flexible membrane, the switches configured for providing a number of selection functions wherein at least one of the switches is approximately co-located with the first axis.
  • [0008]
    In other embodiments, low-profile scrolling input assemblies are presented including: a scrolling input arrangement for providing a scrolling function, the scrolling input arrangement having a top surface and a bottom surface, the scrolling input arrangement including, a flexible membrane; a number of capacitive sensors mechanically integrated with the flexible membrane, the capacitive sensors radially disposed with respect to a first axis that is perpendicular with respect to the flexible membrane; an integrated circuit mechanically coupled with the flexible membrane, the integrated circuit electronically coupled with the capacitive sensors, the integrated circuit configured to process a plurality of electronic signals from the capacitive sensors to provide a scrolling function; a connection region on the flexible membrane for electronically coupling the integrated circuit with a device; a backing plate for providing mechanical support for the scrolling input arrangement, the backing plate mechanically coupled with the bottom surface; and a cover plate for providing protecting the top surface, the cover plate configured to provide a low-friction surface to receive a user input. In some embodiments, assemblies further include: a number of switches mechanically integrated with the flexible membrane, the switches configured for providing a number of selection functions. In some embodiments, the backing plate further includes a number of actuator nubs for actuating the switches. In some embodiments, assemblies further include a number of anti-rotation elements for securing the assembly against a rotational force.
  • [0009]
    In other embodiments, methods of calibrating a number of capacitive sensors in response to a changing positive temperature gradient are presented including: establishing a baseline, the baseline comprising a first minimum function of a signal from each of the plurality of capacitive sensors; scanning the plurality capacitive sensors; and if more than eight of the plurality of capacitive sensors exceeds a threshold value, determining a thermal drift of the plurality of capacitive sensors, the thermal drift corresponding to a second minimum function of a signal from each of the capacitive sensors, and for each of the capacitive sensors, calculating an updated baseline based on the baseline and the thermal drift such that the capacitive sensors are calibrated. In some embodiments, the threshold value is selected to avoid a noise floor of the capacitive sensors. In some embodiments, scanning the capacitive sensors frequency is conducted at a frequency of approximately three megahertz.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0010]
    The present invention is illustrated by way of example, and not by way of limitation, in the figures of the accompanying drawings and in which like reference numerals refer to similar elements and in which:
  • [0011]
    FIG. 1 is an illustrative cross-sectional representation of a scrolling device portion;
  • [0012]
    FIG. 2 is an illustrative representation of a scrolling input arrangement in accordance with an embodiment of the present invention;
  • [0013]
    FIG. 3 is an illustrative representation in exploded as well as cross-section views of a scrolling input assembly in accordance with an embodiment of the present invention;
  • [0014]
    FIG. 4 is an illustrative representation of a scrolling input arrangement in accordance with an embodiment of the present invention;
  • [0015]
    FIG. 5 is an illustrative representation in exploded as well as cross-section views of a scrolling input assembly in accordance with an embodiment of the present invention; and
  • [0016]
    FIG. 6 is an illustrative flowchart of a method of calibrating a plurality of capacitive sensors in accordance with an embodiment of the present invention.
  • DETAILED DESCRIPTION
  • [0017]
    The present invention will now be described in detail with reference to a few embodiments thereof as illustrated in the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without some or all of these specific details. In other instances, well known process steps and/or structures have not been described in detail in order to not unnecessarily obscure the present invention.
  • [0018]
    Various embodiments are described hereinbelow, including methods and techniques. It should be kept in mind that the invention might also cover articles of manufacture that includes a computer readable medium on which computer-readable instructions for carrying out embodiments of the inventive technique are stored. The computer readable medium may include, for example, semiconductor, magnetic, opto-magnetic, optical, or other forms of computer readable medium for storing computer readable code. Further, the invention may also cover apparatuses for practicing embodiments of the invention. Such apparatus may include circuits, dedicated and/or programmable, to carry out tasks pertaining to embodiments of the invention. Examples of such apparatus include a general-purpose computer and/or a dedicated computing device when appropriately programmed and may include a combination of a computer/computing device and dedicated/programmable circuits adapted for the various tasks pertaining to embodiments of the invention.
  • [0019]
    FIG. 2 is an illustrative representation of a scrolling input arrangement 200 in accordance with an embodiment of the present invention. In particular, scrolling input arrangement 200 includes a flexible membrane 204. In some embodiments, flexible membrane 204 is a polyimide film. Flexible membrane 204 provides distinct advantages over prior solutions. For example, flexible membrane 204 provides a reduction in thickness over printed circuit boards (PCB) while still providing adequate structure for electronic components. In some embodiments, flexible membrane 204 may have a thickness of approximately 0.21 millimeters where typical PCB applications have a thickness of approximately 0.50 millimeters. Flexible membrane 204 provides further advantage by allowing associated electronic components and connectors to be disposed away from an arrangement stack comprised of capacitive elements. Allowing associated electronic components and connectors to be disposed away from an arrangement stack may thus provide a thinner cross-sectional profile of scrolling input arrangement 200 as well as provide mechanical shock insulation for associated electronic components. In this manner, a smaller, more durable arrangement may be realized.
  • [0020]
    In some instances, flexible membrane 204 may provide for increased tactile feedback efficiency. Tactile feedback efficiency is a measurement of a user's ability to discern a tactile change. Thus, when tactile feedback efficiency is high, a user is more readily able to discern a tactile change. In one example, a switch or plurality of switches may be co-located with flexible membrane 204. When those switches are actuated, a user may more readily discern a tactile change (e.g. a “click”) over prior art solutions because of flexible membrane's 204 physical properties. As a further advantage, tactile specificity may result because of flexible membrane's 204 physical properties. That is, because of flexible membrane's 204 elasticity, unintentional actuation of switches may be reduced or avoided altogether. This may allow for more switches to be placed closer together while avoiding inadvertent actuation of neighboring switches.
  • [0021]
    As can be appreciated, flexible membrane 204 may be cut or formed into any number of shapes in accordance with user preferences. The illustrated shape is provided for clarity and should not be construed as limiting. Mechanically integrated with flexible membrane 204 are a variety of electronic components. Mechanical integration of capacitive sensors, for example, may be accomplished by gluing, bonding, molding, or any other method known in the art without departing from the present invention. A number of capacitive sensors 208 may be radially disposed with respect to axis 202, which is perpendicular with respect to flexible membrane 204. Capacitive sensors 208 may also be mechanically integrated with top surface of flexible membrane 204. In some embodiments, 16 capacitive sensors are utilized. Capacitive sensors 208 may be mechanically integrated with flexible membrane 204 in any manner well-known in the art. Each capacitive sensor includes a plate element 210 and a trace element (not shown). A plate element is one plate in a capacitor and is mechanically integrated with flexible membrane 204. Trace elements (not shown) may also be mechanically integrated with flexible membrane 204. Trace elements provide for electronic communication between capacitive sensors 208 and integrated circuit (IC) region 212. An IC provides processing capability for capacitive sensors 208. IC processing will be discussed in further detail below for FIG. 6. Any number of IC's may be mechanically coupled with flexible membrane 204 without departing from the present invention. Mechanical coupling of integrated circuits, for example, may be accomplished by gluing, bonding, molding, or any other method known in the art without departing from the present invention.
  • [0022]
    As can be appreciated, for each capacitive sensor, the sum of the surface area of its corresponding plate element and the surface area of its corresponding trace element is the sensor surface area. In some embodiments, the sensor surface area for all capacitive sensors is substantially equal in size. Thus, where a longer trace element is required due to location constraints, a corresponding smaller surface area of the plate element results. Thus, plate elements may not match exactly in some embodiments. At least one reason for matching sensor surface areas is so that sensing will be uniform across the arrangement. As can be appreciated, where matching sensor surface areas is not practicable, adjustments for each sensor may be made algorithmically thus calibrating each sensor to its particular configuration.
  • [0023]
    Scrolling input arrangement 200 may further include ground pad 220 for electronically connecting with a ground source. Ground shielding 232 may be incorporated in some embodiments to provide for electronic isolation of capacitive sensors 208. Ground shielding may be mechanically integrated with flexible membrane 204 in any manner well-known in the art. A connection region 216 may be utilized for electronically coupling the arrangement 200 with an associated electronic device. In some examples, the electronic device is an IPOD™. Any number of connectors may be mechanically integrated with flexible membrane 204 without departing from the present invention.
  • [0024]
    Still further, in some embodiments, flexible membrane 204 may be configured with anti-rotation elements 228. Anti-rotation elements provide rotational stability for flexible membrane 204. In this example, anti-rotation elements are embodied as cut-outs that mate with a matching surface. In other embodiments, through holes 224 may be provided to allow actuator nubs disposed on one side of scrolling input arrangement 200 to reach electronic elements disposed on an opposite side of scrolling input arrangement 200. As can be appreciated, anti-rotation elements and through holes may be configured in any manner in accordance with user preferences without departing from the present invention.
  • [0025]
    FIG. 3 is an illustrative representation in exploded as well as cross-section views of a scrolling input assembly 300 in accordance with an embodiment of the present invention. Scrolling input assembly 300 includes a scrolling input arrangement 312 such as those described above for FIG. 2. Scrolling input assembly 300 further includes cover plate 304. Cover plate 304 may provide protection for the top surface of scrolling input arrangement 312. Cover plate 304 may also provide a low-friction surface to receive user input from, for example, a finger or stylus. Referring to cross-sectional illustration, cover plate 304 may be configured with an actuator nub 316 for actuating a switch 318. Switch 318 may be electronically coupled with a processor or IC to provide selection functions individually or in combination. As can be appreciated, through holes 311 (see also FIG. 2) provide access for actuator nub 318. Cover plate 304 may be composed of any suitable material that does not interfere with capacitive sensing. In some embodiments thermoplastic is utilized to create a cover plate. It should be noted that the figures provided herein are for illustrative purposes only and should not be construed to provide precise dimensions.
  • [0026]
    In some embodiments, scrolling input assembly 300 may include a center button 308 that may actuate switch 310. Switch 310 may be electronically coupled with a processor or IC to provide selection functions. Backing plate 314 may be mechanically coupled with the bottom surface of scrolling input arrangement 312 to provide structural support. Backing plate 314 may also provide a grounding surface in some embodiments.
  • [0027]
    FIG. 4 is an illustrative representation of a scrolling input arrangement 400 in accordance with an embodiment of the present invention. In particular, scrolling input arrangement 400 includes a flexible membrane 404. In some embodiments, flexible membrane 404 is a polyimide film. Flexible membrane 404 provides distinct advantages over prior solutions. For example, flexible membrane 404 provides a reduction in thickness over printed circuit boards (PCB) while still providing adequate structure for electronic components. In some embodiments, flexible membrane 404 may have a thickness of approximately 0.21 millimeters where typical PCB applications have a thickness of approximately 0.50 millimeters. Flexible membrane 404 provides further advantage by allowing associated electronic components and connectors to be disposed away from an arrangement stack comprised of capacitive elements. Allowing associated electronic components and connectors to be disposed away from an arrangement stack may thus provide a thinner cross-sectional profile of scrolling input arrangement 400 as well as provide mechanical shock insulation for associated electronic components. In this manner, a smaller, more durable arrangement may be realized.
  • [0028]
    In some instances, flexible membrane 404 may provide for increased tactile feedback efficiency. Tactile feedback efficiency is a measurement of a user's ability to discern a tactile change. Thus, when tactile feedback efficiency is high, a user is more readily able to discern a tactile change. In one embodiment, switch 420 may be mechanically integrated with flexible membrane 404. When switch 420 actuated, a user may more readily discern a tactile change (e.g. a “click”) over prior art solutions because of flexible membrane's 404 physical properties. As a further advantage, tactile specificity may result because of flexible membrane's 404 physical properties. That is, because of flexible membrane's 404 elasticity, unintentional actuation of switches may be reduced or avoided altogether. This may allow for more switches to be placed closer together while avoiding inadvertent actuation of neighboring switches. In other embodiments, a flexible membrane 404 may include a center region 424 for mechanically integrating center switch 428 such that the center switch is approximately co-located with axis 402. As noted above for FIG. 2, electronic components (e.g. switches) need not be co-located with capacitive sensors. In some embodiments, however, some advantages may be realized by co-locating some electronic components with capacitive sensors such as ease of manufacture or assembly.
  • [0029]
    As can be appreciated, flexible membrane 404 may be cut or formed into any number of shapes in accordance with user preferences. The illustrated shape is provided for clarity and should not be construed as limiting. Mechanically integrated with flexible membrane 404 are a variety of electronic components. A number of capacitive sensors 408 may be radially disposed with respect to axis 402 and mechanically integrated with top surface of flexible membrane 404. In some embodiments, 16 capacitive sensors are utilized. Capacitive sensors 408 may be mechanically integrated with flexible membrane 404 in any manner well-known in the art. Each capacitive sensor includes a plate element 410 and a trace element (not shown). A plate element is one plate in a capacitor and is mechanically integrated with flexible membrane 404. Trace elements (not shown) may also be mechanically integrated with flexible membrane 404. Trace elements provide for electronic communication between capacitive sensors 408 and integrated circuit (IC) region 412. An IC provides processing capability for capacitive sensors 408. IC processing will be discussed in further detail below for FIG. 6. Any number of IC's may be mechanically integrated with flexible membrane 404 without departing from the present invention.
  • [0030]
    As can be appreciated, for each capacitive sensor, the sum of the surface area of its corresponding plate element and the surface area of its corresponding trace element is the sensor surface area. In some embodiments, the sensor surface area for all capacitive sensors is equivalent. Thus, where a longer trace element is required due to location constraints, a corresponding smaller surface area of the plate element results. Thus, plate elements may not match exactly in some embodiments. At least one reason for matching sensor surface areas is so that sensing will be uniform across the arrangement. As can be appreciated, where matching sensor surface areas is not practicable, adjustments for each sensor may be made algorithmically thus calibrating each sensor to its particular configuration.
  • [0031]
    Finally, a connection region 416 may be utilized for electronically coupling the arrangement 400 with an associated electronic device. In some examples, the electronic device is an IPOD™. Any number of connectors may be mechanically integrated with flexible membrane 404 without departing from the present invention.
  • [0032]
    FIG. 5 is an illustrative representation in exploded as well as cross-section views of a scrolling input assembly 500 in accordance with an embodiment of the present invention. Scrolling input assembly 500 includes a scrolling input arrangement 512 such as those described above for FIG. 4. Scrolling input assembly 500 further includes cover plate 504. Cover plate 504 may provide protection for the top surface of scrolling input arrangement 512. Cover plate 504 may also provide a low-friction surface to receive user input from, for example, a finger or stylus. Cover plate 504 may be composed of any suitable material that does not interfere with capacitive sensing. In some embodiments thermoplastic is utilized to create a cover plate. It should be noted that the figures provided herein are for illustrative purposes only and should not be construed to provide precise dimensions.
  • [0033]
    In some embodiments, scrolling input assembly 500 may include a center button 508 that may actuate switch 510 on scrolling arrangement 512. Switch 510 may be electronically coupled with a processor or IC to provide selection functions. Backing plate 514 may be mechanically coupled with the bottom surface of scrolling input arrangement 512 to provide structural support. Backing plate 514 may also provide a grounding surface in some embodiments. In still other embodiments, grounding plate 514 may be configured with actuator nub 516 for actuating switch 520 on scrolling input arrangement 512. In some embodiments, actuator nub 516 may be co-compression molded.
  • [0034]
    FIG. 6 is an illustrative flowchart of a method of calibrating a plurality of capacitive sensors in accordance with an embodiment of the present invention. As noted above, current designs may fail to properly calibrate in environments experiencing rapid temperatures changes. In one example, embodiments may be configured to respond to a temperature change of approximately 4 C./ms within a range of approximately 0 C. to 60 C. Thus, at a first step 604, a baseline is established. A baseline may be established by assuming a current baseline and then scanning a plurality of capacitive sensors and tracking a lower edge of that scan to find a current sample. A minimum function of the current sample and the current baseline will provide a new current baseline for use with methods described herein.
  • [0035]
    At a next step 608, capacitive sensors are scanned. As can be appreciated, responsiveness of a system is determined at least in part by the frequency with which samples are taken. For example, if a capacitive sensor is scanned more often, then the accuracy of the sample is likely to be much higher than if the capacitive sensor is scanned less often. Processing power and power consumption are two factors which account for a selection of sample frequency. In some embodiments described herein capacitive sensors are scanned at a frequency of approximately three megahertz. Once capacitive sensors are scanned at a step 608, the method determines whether more than eight capacitive sensors have a count change greater than two. The selection of number of capacitive sensors corresponds to a likely change in sensor not attributable to a finger. That is, it is assumed, in this example, that a finger generally covers no more than eight capacitive sensors at any one time. In this manner, the method is determining whether a change in sensor is attributable to a change in ambient. A change in counts corresponds to a change in temperature. The selection of how many counts (i.e. threshold value) corresponds to a count high enough to avoid the noise floor of the sensor while still providing a count responsive to rapid changes. As can be appreciated by one skilled in the art, a noise floor of a sensor is generally sensor dependent. That is, for any given sensor, a noise floor may be specified by the manufacturer in accordance with manufacturing parameters. Thus, when more than eight capacitive sensors are scanned that have a count change greater than two, the method then calculates thermal drift at a step 616.
  • [0036]
    Thermal drift corresponds to a change in baseline attributable to change in ambient temperature. In one embodiment, thermal drift is a minimum function of the signals of all capacitive sensors. Once thermal drift is found, that value is added to each capacitive sensor signal value at a step 620 thus creating a new baseline for each capacitive sensor signal value. The method continues to a step 624 continuing to a step 608 to scan all capacitive sensors. If the method, at a step 612 determines that eight or more capacitive sensors do not have a count change greater than two, the method continues to a step 624 continuing to a step 608 to scan all capacitive sensors.
  • [0037]
    While this invention has been described in terms of several embodiments, there are alterations, permutations, and equivalents, which fall within the scope of this invention. It should also be noted that there are many alternative ways of implementing the methods and apparatuses of the present invention. For example, although embodiments described herein provide for 16 capacitive sensors, more or fewer sensors may be utilized depending on user preferences and system requirements without departing from the present invention. Further, while scanning frequency has been described as approximately three megahertz, higher and lower frequencies may be employed without departing from the present invention. It is therefore intended that the following appended claims be interpreted as including all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention.
Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US4246452 *Jan 5, 1979Jan 20, 1981Mattel, Inc.Switch apparatus
US4264903 *May 7, 1979Apr 28, 1981General Electric CompanyCapacitive touch control and display
US4380007 *May 27, 1981Apr 12, 1983Playmont AgProximity switch
US4380040 *Aug 7, 1980Apr 12, 1983Bfg GlassgroupCapacitive systems for touch control switching
US4570149 *Mar 15, 1983Feb 11, 1986Koala Technologies CorporationSimplified touch tablet data device
US4644100 *Mar 22, 1985Feb 17, 1987Zenith Electronics CorporationSurface acoustic wave touch panel system
US4719524 *Oct 7, 1985Jan 12, 1988Sony CorporationSignal reproduction apparatus including touched state pattern recognition speed control
US4734034 *Mar 29, 1985Mar 29, 1988Sentek, IncorporatedContact sensor for measuring dental occlusion
US4736191 *Aug 2, 1985Apr 5, 1988Karl E. MatzkeTouch activated control method and apparatus
US4739191 *Apr 27, 1981Apr 19, 1988Signetics CorporationDepletion-mode FET for the regulation of the on-chip generated substrate bias voltage
US4739299 *Jan 17, 1986Apr 19, 1988Interlink Electronics, Inc.Digitizer pad
US4798919 *Mar 11, 1988Jan 17, 1989International Business Machines CorporationGraphics input tablet with three-dimensional data
US4810992 *Apr 19, 1988Mar 7, 1989Interlink Electronics, Inc.Digitizer pad
US4897511 *Jun 16, 1988Jan 30, 1990Gunze LimitedMethod of detection of the contacting position in touch panel sensor
US4914624 *May 6, 1988Apr 3, 1990Dunthorn David IVirtual button for touch screen
US4917515 *Sep 27, 1988Apr 17, 1990Computer Gesellschaft Konstanz MbhInking ribbon cassette
US4990900 *Jun 9, 1988Feb 5, 1991Alps Electric Co., Ltd.Touch panel
US5008497 *Mar 22, 1990Apr 16, 1991Asher David JTouch controller
US5179648 *Jan 25, 1991Jan 12, 1993Hauck Lane TComputer auxiliary viewing system
US5186646 *Jan 16, 1992Feb 16, 1993Pederson William AConnector device for computers
US5192082 *Aug 12, 1992Mar 9, 1993Nintendo Company LimitedTV game machine
US5276524 *Jun 4, 1992Jan 4, 1994Konami Kogyo Kabushiki KaishaWide display with two CRTs arranged to form a non-overlapping juxtaposed image with one CRT movable from an accommodated position to an operative position
US5278362 *Jul 6, 1992Jan 11, 1994Nihon Kaiheiki Industrial Company, Ltd.Push-button switch with display device
US5305017 *Jul 13, 1992Apr 19, 1994Gerpheide George EMethods and apparatus for data input
US5404152 *Jan 21, 1994Apr 4, 1995Mitsubishi Denki Kabushiki KaishaMulti-dimension track-ring
US5408621 *Jun 10, 1993Apr 18, 1995Ben-Arie; JezekielCombinatorial data entry system having multi-position switches, each switch having tiltable control knob
US5495566 *Nov 22, 1994Feb 27, 1996Microsoft CorporationScrolling contents of a window
US5508703 *Sep 14, 1993Apr 16, 1996Smk CorporationMembrane switch having a rotary motion detection function
US5596347 *Mar 31, 1995Jan 21, 1997Microsoft CorporationSystem and method for computer cursor control
US5598183 *Dec 12, 1995Jan 28, 1997Microsoft CorporationSystem and method for computer cursor control
US5611040 *Apr 5, 1995Mar 11, 1997Microsoft CorporationMethod and system for activating double click applications with a single click
US5613137 *Mar 18, 1994Mar 18, 1997International Business Machines CorporationComputer system with touchpad support in operating system
US5617114 *May 24, 1995Apr 1, 1997Xerox CorporationUser interface having click-through tools that can be composed with other tools
US5726687 *Nov 13, 1996Mar 10, 1998Microsoft CorporationAuto-scrolling with mouse speed computation during dragging
US5729219 *Aug 2, 1996Mar 17, 1998Motorola, Inc.Selective call radio with contraposed touchpad
US5730165 *Dec 26, 1995Mar 24, 1998Philipp; HaraldTime domain capacitive field detector
US5856822 *Oct 27, 1995Jan 5, 199902 Micro, Inc.Touch-pad digital computer pointing-device
US5859629 *Jul 1, 1996Jan 12, 1999Sun Microsystems, Inc.Linear touch input device
US5875311 *Aug 1, 1996Feb 23, 1999International Business Machines CorporationComputer system with touchpad support in operating system
US5889236 *Nov 13, 1995Mar 30, 1999Synaptics IncorporatedPressure sensitive scrollbar feature
US5889511 *Jan 17, 1997Mar 30, 1999Tritech Microelectronics International, Ltd.Method and system for noise reduction for digitizing devices
US5894117 *Jul 17, 1997Apr 13, 1999Smk Co., Ltd.Keyboard switch for notebook type computer or the like
US6025832 *Sep 27, 1996Feb 15, 2000Kabushiki Kaisha ToshibaSignal generating apparatus, signal inputting apparatus and force-electricity transducing apparatus
US6031518 *May 30, 1997Feb 29, 2000Microsoft CorporationErgonomic input device
US6034672 *Jun 10, 1994Mar 7, 2000Sextant AvioniqueDevice for multimode management of a cursor on the screen of a display device
US6179496 *Dec 28, 1999Jan 30, 2001Shin Jiuh Corp.Computer keyboard with turnable knob
US6181322 *Nov 7, 1997Jan 30, 2001Netscape Communications Corp.Pointing device having selection buttons operable from movement of a palm portion of a person's hands
US6188393 *Oct 5, 1998Feb 13, 2001Sysgration Ltd.Scroll bar input device for mouse
US6191774 *Sep 22, 1999Feb 20, 2001Immersion CorporationMouse interface for providing force feedback
US6198054 *Apr 11, 2000Mar 6, 2001Itt Manufacturing Enterprises, Inc.Multiple electric switch with single actuating lever
US6198473 *Oct 6, 1998Mar 6, 2001Brad A. ArmstrongComputer mouse with enhance control button (s)
US6211861 *Dec 7, 1999Apr 3, 2001Immersion CorporationTactile mouse device
US6219038 *Aug 6, 1998Apr 17, 2001Samsung Electronics Co., Ltd.Water resistant touch pad for an electronic apparatus
US6340800 *May 27, 2000Jan 22, 2002International Business Machines CorporationMultiplexing control device and method for electronic systems
US6357887 *Oct 25, 1999Mar 19, 2002Apple Computers, Inc.Housing for a computing device
US6373265 *Feb 2, 2000Apr 16, 2002Nitta CorporationElectrostatic capacitive touch sensor
US6373470 *Jan 12, 2000Apr 16, 2002Apple Computer, Inc.Cursor control device having an integral top member
US6677927 *Aug 23, 1999Jan 13, 2004Microsoft CorporationX-Y navigation input device
US6686904 *Mar 30, 2001Feb 3, 2004Microsoft CorporationWheel reporting method for a personal computer keyboard interface
US6703550 *Oct 10, 2001Mar 9, 2004Immersion CorporationSound data output and manipulation using haptic feedback
US6724817 *Jun 5, 2000Apr 20, 2004Amphion Semiconductor LimitedAdaptive image data compression
US6727889 *Sep 14, 2001Apr 27, 2004Stephen W. ShawComputer mouse input device with multi-axis palm control
US6844872 *Oct 11, 2000Jan 18, 2005Apple Computer, Inc.Computer mouse having side areas to maintain a depressed button position
US7006077 *Nov 30, 1999Feb 28, 2006Nokia Mobile Phones, Ltd.Electronic device having touch sensitive slide
US20020027547 *Jul 11, 2001Mar 7, 2002Noboru KamijoWristwatch type device and method for moving pointer
US20020030665 *Apr 30, 2001Mar 14, 2002Matsushita Electric Industrial Co., Ltd.Coordinate input device and portable information apparatus equipped with coordinate input device
US20020033848 *Apr 19, 2001Mar 21, 2002Sciammarella Eduardo AgustoSystem for managing data objects
US20030002246 *Feb 13, 2002Jan 2, 2003Apple Computers, Inc.Active enclousure for computing device
US20030025679 *Jun 6, 2002Feb 6, 2003Cirque CorporationSystem for disposing a proximity sensitive touchpad behind a mobile phone keypad
US20030028346 *Mar 30, 2001Feb 6, 2003Sinclair Michael J.Capacitance touch slider
US20030043121 *May 22, 2001Mar 6, 2003Richard ChenMultimedia pointing device
US20030043174 *Aug 29, 2001Mar 6, 2003Hinckley Kenneth P.Automatic scrolling
US20030050092 *Aug 2, 2002Mar 13, 2003Yun Jimmy S.Portable digital player--battery
US20030076301 *Sep 26, 2002Apr 24, 2003Apple Computer, Inc.Method and apparatus for accelerated scrolling
US20030076303 *Feb 7, 2002Apr 24, 2003Apple Computers, Inc.Mouse having a rotary dial
US20040080682 *Oct 29, 2002Apr 29, 2004Dalton Dan L.Apparatus and method for an improved electronic display
US20050030048 *Aug 5, 2003Feb 10, 2005Bolender Robert J.Capacitive sensing device for use in a keypad assembly
US20050083299 *Sep 2, 2004Apr 21, 2005Kabushiki Kaisha Tokai-Rika-Denki-SeisakushoMonitor display control apparatus and monitor display control method
US20050083307 *Oct 15, 2003Apr 21, 2005Aufderheide Brian E.Patterned conductor touch screen having improved optics
US20060032680 *Aug 15, 2005Feb 16, 2006Fingerworks, Inc.Method of increasing the spatial resolution of touch sensitive devices
US20070013671 *Mar 21, 2006Jan 18, 2007Apple Computer, Inc.Touch pad for handheld device
US20070052044 *Feb 14, 2006Mar 8, 2007Larry ForsbladScrolling input arrangements using capacitive sensors on a flexible membrane
US20070052691 *Nov 3, 2006Mar 8, 2007Apple Computer, Inc.Movable touch pad with added functionality
US20070080936 *Dec 13, 2006Apr 12, 2007Apple Computer, Inc.Method and apparatus for accelerated scrolling
US20080006453 *Jul 6, 2006Jan 10, 2008Apple Computer, Inc., A California CorporationMutual capacitance touch sensing device
US20080006454 *Aug 1, 2007Jan 10, 2008Apple Computer, Inc.Mutual capacitance touch sensing device
US20080007533 *Jul 6, 2006Jan 10, 2008Apple Computer, Inc., A California CorporationCapacitance sensing electrode with integrated I/O mechanism
US20080007539 *Aug 1, 2007Jan 10, 2008Steve HotellingMutual capacitance touch sensing device
US20080012837 *Aug 1, 2007Jan 17, 2008Apple Computer, Inc.Touch pad for handheld device
US20080018615 *Jul 30, 2007Jan 24, 2008Apple Inc.Touch pad for handheld device
US20080018616 *Aug 1, 2007Jan 24, 2008Apple Computer, Inc.Techniques for interactive input to portable electronic devices
US20080018617 *Aug 1, 2007Jan 24, 2008Apple Computer, Inc.Illuminated touch pad
US20080087476 *Aug 6, 2007Apr 17, 2008Apple Inc.Sensor configurations in a user input device
USD437860 *Jun 1, 1998Feb 20, 2001Sony CorporationSelector for audio visual apparatus
USD454568 *Jul 17, 2000Mar 19, 2002Apple Computer, Inc.Mouse
USD455793 *Mar 12, 2001Apr 16, 2002Legend Technology Co., Ltd.Liquid crystal display monitor for multi-media games
USD468365 *Mar 12, 2002Jan 7, 2003Digisette, LlcDataplay player
USD469109 *Oct 22, 2001Jan 21, 2003Apple Computer, Inc.Media player
USD472245 *Aug 2, 2002Mar 25, 2003Apple Computer, Inc.Media player
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US7671837Mar 2, 2010Apple Inc.Scrolling input arrangements using capacitive sensors on a flexible membrane
US7710393Dec 13, 2006May 4, 2010Apple Inc.Method and apparatus for accelerated scrolling
US7710394Dec 13, 2006May 4, 2010Apple Inc.Method and apparatus for use of rotational user inputs
US7710409Dec 13, 2006May 4, 2010Apple Inc.Method and apparatus for use of rotational user inputs
US7795553Sep 14, 2010Apple Inc.Hybrid button
US7825345Aug 26, 2008Nov 2, 2010Kano Yoshio WReversely mounted tactile switch assembly and printed circuit board therewith
US7880729Aug 4, 2006Feb 1, 2011Apple Inc.Center button isolation ring
US7910843Mar 22, 2011Apple Inc.Compact input device
US7932897Apr 26, 2011Apple Inc.Method of increasing the spatial resolution of touch sensitive devices
US8022935Jul 6, 2006Sep 20, 2011Apple Inc.Capacitance sensing electrode with integrated I/O mechanism
US8044314Oct 25, 2011Apple Inc.Hybrid button
US8059099Nov 15, 2011Apple Inc.Techniques for interactive input to portable electronic devices
US8125461Sep 5, 2008Feb 28, 2012Apple Inc.Dynamic input graphic display
US8274479Sep 25, 2012Apple Inc.Gimballed scroll wheel
US8330061Mar 18, 2011Dec 11, 2012Apple Inc.Compact input device
US8395590Jun 1, 2009Mar 12, 2013Apple Inc.Integrated contact switch and touch sensor elements
US8416198Apr 9, 2013Apple Inc.Multi-dimensional scroll wheel
US8446370May 21, 2013Apple Inc.Touch pad for handheld device
US8482530Aug 21, 2007Jul 9, 2013Apple Inc.Method of capacitively sensing finger position
US8514185Aug 1, 2007Aug 20, 2013Apple Inc.Mutual capacitance touch sensing device
US8537132Apr 23, 2012Sep 17, 2013Apple Inc.Illuminated touchpad
US8552990Aug 1, 2007Oct 8, 2013Apple Inc.Touch pad for handheld device
US8683378Jan 9, 2008Mar 25, 2014Apple Inc.Scrolling techniques for user interfaces
US8743060Jul 6, 2009Jun 3, 2014Apple Inc.Mutual capacitance touch sensing device
US8749493Jul 30, 2007Jun 10, 2014Apple Inc.Movable touch pad with added functionality
US8816967Sep 25, 2008Aug 26, 2014Apple Inc.Capacitive sensor having electrodes arranged on the substrate and the flex circuit
US8820133Sep 30, 2008Sep 2, 2014Apple Inc.Co-extruded materials and methods
US8866780Apr 8, 2013Oct 21, 2014Apple Inc.Multi-dimensional scroll wheel
US8869585 *Feb 19, 2009Oct 28, 2014Sphere Medical LimitedMethods of calibrating a sensor in a patient monitoring system
US8872771Jul 7, 2009Oct 28, 2014Apple Inc.Touch sensing device having conductive nodes
US8922530Jan 6, 2010Dec 30, 2014Apple Inc.Communicating stylus
US8933890Aug 1, 2007Jan 13, 2015Apple Inc.Techniques for interactive input to portable electronic devices
US8952886Dec 19, 2007Feb 10, 2015Apple Inc.Method and apparatus for accelerated scrolling
US8994661 *Jun 29, 2012Mar 31, 2015Google Technology Holdings LLCUser interface device having capacitive trackball assembly
US9009626Dec 19, 2007Apr 14, 2015Apple Inc.Method and apparatus for accelerated scrolling
US9354751Sep 16, 2009May 31, 2016Apple Inc.Input device with optimized capacitive sensing
US9360967Jul 6, 2006Jun 7, 2016Apple Inc.Mutual capacitance touch sensing device
US9367151Jan 28, 2014Jun 14, 2016Apple Inc.Touch pad with symbols based on mode
US9405421Apr 3, 2015Aug 2, 2016Apple Inc.Mutual capacitance touch sensing device
US20050052425 *Aug 18, 2003Mar 10, 2005Zadesky Stephen PaulMovable touch pad with added functionality
US20050110768 *Nov 25, 2003May 26, 2005Greg MarriottTouch pad for handheld device
US20060032680 *Aug 15, 2005Feb 16, 2006Fingerworks, Inc.Method of increasing the spatial resolution of touch sensitive devices
US20060181517 *Feb 11, 2005Aug 17, 2006Apple Computer, Inc.Display actuator
US20070052044 *Feb 14, 2006Mar 8, 2007Larry ForsbladScrolling input arrangements using capacitive sensors on a flexible membrane
US20070052691 *Nov 3, 2006Mar 8, 2007Apple Computer, Inc.Movable touch pad with added functionality
US20070080952 *Aug 4, 2006Apr 12, 2007Brian LynchCenter button isolation ring
US20070083822 *Dec 13, 2006Apr 12, 2007Apple Computer, Inc.Method and apparatus for use of rotational user inputs
US20070085841 *Dec 13, 2006Apr 19, 2007Apple Computer, Inc.Method and apparatus for accelerated scrolling
US20070152977 *Mar 31, 2006Jul 5, 2007Apple Computer, Inc.Illuminated touchpad
US20070273671 *Jul 30, 2007Nov 29, 2007Zadesky Stephen PMovable touch pad with added functionality
US20070279394 *Sep 11, 2006Dec 6, 2007Apple Computer, Inc.Techniques for interactive input to portable electronic devices
US20080006453 *Jul 6, 2006Jan 10, 2008Apple Computer, Inc., A California CorporationMutual capacitance touch sensing device
US20080006454 *Aug 1, 2007Jan 10, 2008Apple Computer, Inc.Mutual capacitance touch sensing device
US20080007533 *Jul 6, 2006Jan 10, 2008Apple Computer, Inc., A California CorporationCapacitance sensing electrode with integrated I/O mechanism
US20080007539 *Aug 1, 2007Jan 10, 2008Steve HotellingMutual capacitance touch sensing device
US20080018615 *Jul 30, 2007Jan 24, 2008Apple Inc.Touch pad for handheld device
US20080018616 *Aug 1, 2007Jan 24, 2008Apple Computer, Inc.Techniques for interactive input to portable electronic devices
US20080018617 *Aug 1, 2007Jan 24, 2008Apple Computer, Inc.Illuminated touch pad
US20080087476 *Aug 6, 2007Apr 17, 2008Apple Inc.Sensor configurations in a user input device
US20080088582 *Aug 6, 2007Apr 17, 2008Apple Inc.Gimballed scroll wheel
US20080088596 *Jun 18, 2007Apr 17, 2008Apple Inc.Gimballed scroll wheel
US20080088597 *Jun 18, 2007Apr 17, 2008Apple Inc.Sensor configurations in a user input device
US20080088600 *Jul 20, 2007Apr 17, 2008Apple Inc.Method and apparatus for implementing multiple push buttons in a user input device
US20080094352 *Dec 19, 2007Apr 24, 2008Tsuk Robert WMethod and Apparatus for Accelerated Scrolling
US20080098330 *Dec 19, 2007Apr 24, 2008Tsuk Robert WMethod and Apparatus for Accelerated Scrolling
US20080111795 *Aug 21, 2007May 15, 2008Apple Inc.Method of capacitively sensing finger position
US20080284742 *Aug 6, 2007Nov 20, 2008Prest Christopher DMethod and apparatus for implementing multiple push buttons in a user input device
US20080320419 *Jun 20, 2008Dec 25, 2008Michael MatasTouch Screen Device, Method, and Graphical User Interface for Providing Maps, Directions, and Location-Based Information
US20090019949 *Jul 17, 2007Jan 22, 2009Apple Inc.Resistive force sensor with capacitive discrimination
US20090020343 *Aug 6, 2007Jan 22, 2009Apple Inc.Resistive force sensor with capacitive discrimination
US20090058687 *Sep 4, 2008Mar 5, 2009Apple Inc.Compact input device
US20090058801 *Sep 4, 2007Mar 5, 2009Apple Inc.Fluid motion user interface control
US20090064031 *Jan 9, 2008Mar 5, 2009Apple Inc.Scrolling techniques for user interfaces
US20090073130 *Sep 17, 2007Mar 19, 2009Apple Inc.Device having cover with integrally formed sensor
US20090141046 *Sep 5, 2008Jun 4, 2009Apple Inc.Multi-dimensional scroll wheel
US20090179854 *Sep 5, 2008Jul 16, 2009Apple Inc.Dynamic input graphic display
US20090197059 *Sep 30, 2008Aug 6, 2009Apple Inc.Co-extruded materials and methods
US20090273573 *Jul 6, 2009Nov 5, 2009Apple Inc.Mutual capacitance touch sensing device
US20100058251 *Mar 4, 2010Apple Inc.Omnidirectional gesture detection
US20100149127 *Jun 1, 2009Jun 17, 2010Apple Inc.Integrated contact switch and touch sensor elements
US20100289759 *Sep 16, 2009Nov 18, 2010Apple Inc.Input device with optimized capacitive sensing
US20110005845 *Jan 13, 2011Apple Inc.Touch sensing device having conductive nodes
US20110120206 *Feb 19, 2009May 26, 2011Gavin TroughtonMethods of calibrating a sensor in a patient monitoring system
US20110162894 *Jan 6, 2010Jul 7, 2011Apple Inc.Stylus for touch sensing devices
US20110164000 *Jan 6, 2010Jul 7, 2011Apple Inc.Communicating stylus
US20110169667 *Jul 14, 2011Apple Inc.Compact input device
US20110285652 *Nov 24, 2011Kabushiki Kaisha ToshibaBroadcast receiving device and electronic device
US20140002362 *Jun 29, 2012Jan 2, 2014General Instrument CorporationUser Interface Device Having Capacitive Trackball Assembly
Classifications
U.S. Classification345/156, 324/601
International ClassificationG01R35/00, G09G5/34
Cooperative ClassificationH03K17/9622, H03K2217/960755
European ClassificationH03K17/96C1, G01D5/00