CA2268593A1 - Ir receiver using ir transmitting diode - Google Patents
Ir receiver using ir transmitting diode Download PDFInfo
- Publication number
- CA2268593A1 CA2268593A1 CA002268593A CA2268593A CA2268593A1 CA 2268593 A1 CA2268593 A1 CA 2268593A1 CA 002268593 A CA002268593 A CA 002268593A CA 2268593 A CA2268593 A CA 2268593A CA 2268593 A1 CA2268593 A1 CA 2268593A1
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- led
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- 230000004044 response Effects 0.000 claims description 22
- 230000035945 sensitivity Effects 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 11
- 230000007935 neutral effect Effects 0.000 description 9
- 230000006870 function Effects 0.000 description 7
- 238000005538 encapsulation Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000009420 retrofitting Methods 0.000 description 2
- 206010034960 Photophobia Diseases 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 208000013469 light sensitivity Diseases 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C23/00—Non-electrical signal transmission systems, e.g. optical systems
- G08C23/04—Non-electrical signal transmission systems, e.g. optical systems using light waves, e.g. infrared
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C2201/00—Transmission systems of control signals via wireless link
- G08C2201/20—Binding and programming of remote control devices
Abstract
Circuitry using infra-red (IR) diodes in remote control units. In one embodiment an IR
LED is used both as a transmitter diode and also as a receiver diode responsive to light to thereby develop photocurrents and/or voltages for use by external circuitry. In a second embodiment an improved amplifier circuit is provided for an IR LED and IR photo detector diode which is mounted behind, and receives light through, the transmitter IR LED.
LED is used both as a transmitter diode and also as a receiver diode responsive to light to thereby develop photocurrents and/or voltages for use by external circuitry. In a second embodiment an improved amplifier circuit is provided for an IR LED and IR photo detector diode which is mounted behind, and receives light through, the transmitter IR LED.
Description
Background of the Invention This invention relates generally to infra-red ("IR") remote control devices and, more particularly, to learning types of remote control devices.
Infrared remote control transmitters for controlling various functions of television receivers, VCR's, cable decoders and auxiliary equipment have become quite widespread in recent years. The result is often that a user is confronted with a number of different remote controls for controlling various devices made by different manufacturers. Most manufacturers provide transmitters to control their various devices, i.e., TV, VCR, stereo, by re-configuring the transmitter keyboard with a key or switch or the like, and devices of different manufacturers are controlled with different "dedicated" remote control devices. To minimize the number of individual remote control devices a user requires, "learning" universal remote control transmitters have been developed. In a common method of setting up and using universal remote controls, the IR function codes that are to be learned are made available from a teaching transmitter. Learning is accomplished by positioning the teaching and learning transmitters such that IR signals from the teaching transmitter are received by the learning transmitter (remote control device). Next, a program is followed which includes sequentially transmitting the IR function codes associated with the keys of the teaching transmitter to the learning transmitter. The learning transmitter stores the detected 1R function codes in its memory and essentially re-configures its keyboard so that the appropriate IR function codes may be transmitted to the device to be controlled. Television sets, VCR's, entertainment media, and other devices can thus employ universal or standard remote 353331.2 controls that can be adapted to control various and sundry brands. Thus, universal remote control devices can learn the commands for controlling each of the various brands and types of devices.
U.S. Patent No. 5,691,710 issued to Pietraszak et al. and assigned to Zenith Electronics Corp. discloses a self learning IR remote control transmitter of the type mentioned above. U.S.
Patent No. 5,255,313 issued to Darbee and assigned to Universal Electronics Inc., and U.S. Patent No. 5,552,917 issued to Darbee et al. and assigned to Universal Electronics Inc. also disclose universal remote control systems. The present invention provides an improvement to the circuitry of the systems disclosed in the above-mentioned patents.
It is known that, in addition to the ability of light emitting diodes ("LED's ") to provide IR
signals, LEDs may also have the ability to receive, be sensitive to, and react to incoming light.
One such receiver type of IR circuit is disclosed in U.S. Patent No.
4,933,563, issued to Thus and assigned to U.S. Philips Corp. Some of the embodiments disclosed in the present invention exploit this dual effect or capability of 1R diodes to transmit and receiver IR signals; this feature minimizes the circuitry used with learning remote controls, and also facilitates the retrofitting of learning capability to existing remote control designs, since no re-tooling of the plastic case is needed to accommodate a separate IR receiver.
Summary of the Invention This invention provides improved IR diode circuits for use with learning remote controls.
In some of the disclosed embodiments, the same IR LED is utilized to transmit and to receive IR
signals; and, the inventive circuitry is a component of the 1R output circuit for a remote control.
In another of the disclosed embodiments, improved circuitry is provided for a transmitter 1R LED
353331.2 - 2 -and a separate receiver IR photo detector diode, and a method if disclosed whereby the IR photo detector can be mounted behind, and receives light input through the plastic encapsulation of, the transmitter IR LED.
The foregoing features and advantages of the present invention will be apparent from the following more particular description of the invention. The accompanying drawings, listed hereinbelow, are useful in explaining the invention.
Brief Description of the Drawings Fig. 1 shows a circuit for providing IR signals and indicates the 1R receiver section or addition in accordance with the invention;
Fig. 2 is similar to Fig. 1 and includes a transistor amplifier that effectively provides greater light sensitivity;
Fig. 3 adds a linear amplifier to the circuit of Fig. 2 to provide a circuit which is even more sensitive;
Fig. 4 is another embodiment of the invention wherein an IR transmitter LED is used with or without an IR photo detector diode; and, Fig. 5 is a partial view of a case wherein the circuitry of Fig. 4 may be utilized.
Description of the Invention Figure 1 shows a basic schematic circuit 10 of the invention. The circuit 10 of Fig. 1 includes a typical remote IR output circuit 12, with an 1R LED ("infra-red light emitting diode") D1, which provides an 1R output when switching transistor Q2 receives a drive signal. When a 353331.2 - 3 -remote is transmitting, the infra-red (IR) signal is provided by diode D 1, which is effectively connected to the power supply by transistor switch Q2. Resistor R4 limits the current flow through diode D1. The remote 1R output circuit labeled 12 on the left of the vertical dotted line in Figs. 1-3, is known in the art.
The circuit 11 exploits the dual effect or capability of some IR diodes to: a) transmit IR
signals; and b) to receive and react to incoming light to generate photocurrents/photovoltages; that is, IR diode D1 functions both as a transmitter and as a receiver.
In the circuit 12, if the drive signal is not present on lead 16, the electrical path from the power supply Vcc through IR diode D1 to ground is disconnected by transistor Q2 and the remote will not transmit an IR signal. Stated in another way, when the diode D1 is not connected to the power supply in response to the 1R drive signal on lead 16, it (diode D 1 ) is available for use as a receiving diode. The circuitry of Fig. I can thus make use of photo cwrents and/or voltages that are generated by light impinging on diode D1 to provide signals which are amplified and processed by circuit 11 for use by external circuitry.
The IR receiver circuit 11 includes PNP transistor QI that has its emitter connected to the power supply voltage Vcc. The collector of transistor Q1 is connected through resistor R3 to ground reference. The base of transistor Q1 is connected through resistor R1 to the cathode of diode D 1, and through resistor R 1 and R2 to the power supply. Resistor R1 protects transistor Q1 from short-circuiting the diode D1 when the IR driving circuit, including switching transistor Q2, is activated.
Resistor R2 is a relatively large resistor that removes built up charge generated by the diode D1 when Dl is receiving light. A large value of resistor R2 increases sensitivity to light, 353331.2 - 4 -but slows response time. A small value of R2 increases response time, but lowers sensitivity.
Accordingly, the value of resistor R2 is selected dependent on the response desired.
The signal output of transistor Q1 is taken across resistor R3 on lead 17. A
small value of resistor R3 increases speed, a large value of resistor R3 increases sensitivity. Again, the value of resistor R3 is selected based on the response desired.
Under normal lighting conditions, the resistors R1, RZ and R3 are selected so that any voltage developed by D1 is not enough to turn On transistor Q1; and, diode Dl is thus controlled to turn On transistor Q1 (only) in response to signals received from the associated teaching transmitter. The circuit of Fig. 1 draws no power unless an IR drive signal is applied to the circuit. This eliminates the requirement for another microprocessor port pin and power switch circuit.
As mentioned above, in operation, when an IR drive signal is provided to transistor Q2, transistor Q2 conducts and switches the IR diode D1 On to provide an output IR
signal. When the drive signal goes Off, transistor Q2 opens, and diode D1 is effectively disconnected from the power source and ceases to provide an IR signal. Diode D1 is sensitive to received light (light impinging thereon) and when transistor Q1 opens, diode D 1 generates a photocurrent/voltage that turns On transistor Ql; this provides a signal output across resistor R3. This generated signal is coupled to external circuitry through lead 17.
Thus, when the diode D 1 is not providing an IR signal, it is made available for use as a receiving diode. Note that the 1R signal developed by diode D 1 in response to the 1R drive signal is substantially larger than the photocurrents/voltages developed in response to received light. The circuit of Fig. 1 will amplify the output developed by diode D1 from any received light, but will 353331.2 ' S ' not interfere with 1R signal transmission. The output of circuit 11 can thus be used by a microprocessor as a signal source in the learning of a received signal.
Figure 2 shows a circuit similar to Fig. 1, but with higher sensitivity.
Figure 2 adds NPN
transistor Q3 and resistor R5 to the circuit of Fig. 2. In Fig. 2, the output of transistor Q1 is connected through lead 19 to the base of transistor Q3. The collector of transistor Q3 is connected through resistor RS to power sowce Vcc, and the emitter of transistor Q3 is connected to ground.
The signal output is coupled through lead 17. Thus, transistor Q3 and resistor RS comprise a second amplifier stage that increases sensitivity to received signals.
Similarly as in the circuit of Fig. 1, the circuit of Fig. 2 draws no power unless an 1R drive signal is applied to the circuit.
Fig. 3 shows another circuit with even higher sensitivity. In Fig. 3, an NPN
transistor Q1A is connected in the circuit to provide linear amplification between switching transistor Q2 and output transistor Q3. The base of transistor Q 1 A is connected through series capacitor C 1 to the junction of transistor Q2 and diode D1 and through resistor R2 to power source Vcc. A
second capacitor C6 is connected in parallel to capacitor C1. The base of transistor Q1A is also connected through resistor R9 to neutral. The base of transistor Q1A is connected through resistor R3 to power source Vcc and through capacitor C4 to neutral. The emitter of transistor Q1A is connected through resistor RS to neutral. Capacitors C2 and CS are connected in parallel across resistor R5. The collector of transistor QIA is connected through resistor R6 to power source Vcc. The output of trans istor Q 1 A is developed at the junction of the collector of Q 1 A and resistor R6. The output is connected through capacitor C7 and resistor R7 to the base of transistor Q3. A second capacitor C3 is connected in parallel with capacitor C7. A
reverse connected diode D2 has its cathode connected to the base of transistor Q3 and its anode connected to neutral.
353331.2 - 6 -Transistor Q1A and the indicated circuitry form a linear amplifier with a large frequency response, as is known. Transistor Q3 and capacitors C3, C7, diode D2 and resistors R7 and R8 form a switching stage that converts the signals generated by diode D1 to signals usable by a microprocessor. Neutral is connected to ground by switch SW1 in response to a control signal from the host processor on switch control input. This is needed since the amplifier draws current continuously when connected across its power source. SWI is typically a transistor switch circuit.
Fig. 4 shows additional embodiments of the invention. One embodiment of the circuit of Fig. 4 is essentially similar to the embodiments of Figs. 1-3 wherein the same IR diode is used both for transmitting and receiving. (Note that in this embodiment photo detector diode D11 is not in the circuit, this is indicated by the dotted line).
The first embodiment of the circuit of Fig. 4 includes the 1R LED D 10 which has its anode connected to a battery supply and its cathode connected to the emitter of PNP
transistor switch Q6.
The collector of transistor Q6 is connected through res istor R 10 to ground reference. The base of transistor Q6 is connected through resistor R14 to positive bias. The base of transistor Q6 receives its control signal input via control line 21 through resistor R12.
Note that transistor Q6 is a PNP transistor and used in lieu of the NPN input transistor Q2 of Figs. 1-3; hence, transistor Q6 is driven on by a signal of the opposite polarity, all as is well known.
When transistor Q6 is turned on, LED D10 conducts and provides an 1R output. As in the case of the circuits of Figs.
1-3, when the transistor switch Q6 is turned off, the LED D 10 functions as a photo detector and the signal developed is coupled through line or lead 22 as an input to a signal amplifier 25, to be described.
353331.2 ' 7 -A second visible LED D6 has an anode connected to battery supply VBATT and its cathode connected through resistor R12 in control in 24. LED D6 can be of a red color and provide an output such as for indicating the state of the circuit.
Amplifier 25 comprises a PNP transistor Q7 and a NPN transistor Q8. As alluded to above, in one embodiment the base of transistor Q7 is connected through resistor R18 to LED
D10, and in another embodiment, the base of transistor Q7 is connected through resistor R18 to photo detector diode D 11. The emitter of transistor Q7 is connected to a battery supply, and its collector is connected through resistor R16 to a neutral. A capacitor C11 is connected in parallel with resistor R16. A diode D8 has its anode connected to a battery supply and its cathode connected through resistor R19 to the base of transistor Q7. The junction of diode D8 and resistor R19 is connected through resistor R17 to neutral.
The output of transistor Q7 is coupled from its collector to the base of PNP
transistor Q8.
The collector of transistor Q8 is connected through resistor R20 to a battery supply and its emitter is connected to neutral . A capacitor C 12 is connected across transistor Q8 and resistor R20 to provide a stable voltage and assure that a clean digital signal is provided by transistor Q8, all as is known. The output of transistor Q8 and hence of amplifier 25 is taken from the collector of transistor Q8. As mentioned above, the circuit of the first embodiment of Fig.
4, which circuit includes lead 22 but not photo detector diode D 11, operates similarly to the circuits of Figs. 1-3 to amplify the photocurrents/voltages generated by the LED in response to received light pulses and provide electrical output signals. Neutral is connected to ground by switch SWI in response to a control signal from the host processor on switch control input. This is needed since the 353331.2 ' 8 ' amplifier draws current continuously when connected across its power source.
SWI is typically a transistor switch circuit.
In the other embodiment of the circuit of Fig. 4, a separate IR photo detector diode D 11 is connected in the circuit of Fig. 4. (As stated above, this embodiment includes diode D 11 but not lead 22). Diode D11 has its anode connected to battery supply VBATT and its cathode connected through a resistor R18 to the emitter of PNP transistor Q7 of amplifier 25. In this embod invent, the operation of photo diode D 11 is effectively separate from that of LED D 10.
In operation during the receiving mode, IR photo detector diode D 11 is energized by received light pulses. When LED D7 receives an input light pulse it generates a photocurrent thereby providing a signal to turn on transistor Q7. When transistor Q7 conducts, the voltage across resistor R16 goes high, causing transistor Q8 to turn off thereby providing a low output at the collector of transistor Q8 and hence a low voltage output on lead 28. As will be readily appreciated, amplifier 25 thus provides a digital output signal on lead 28 in response to light pulses received by IR photo detector diode D11.
Fig. 5 shows a partial view of a remote control unit wherein the circuitry of Fig. 1-4 can be positioned. A printed circuit board 31 containing the desired one of the circuits of Figs. 1-4 is mounted within a plastic case 30, usually of an elongated and flat design.
A transmitting IR
LED 33 is positioned at the end of the case 30 to extend outwardly. If the embodiment with a separate IR photo detector diode is utilized, a receiving photo detector diode 34, is positioned on the printed circuit board 31 to be located behind and near the IR transmitting diode 33. IR energy from the teaching transmitter will radiate through the translucent encapsulation of the 1R
transmitting diode and stimulate the photo detector diode 34. In other words, the IR photo 353331.2 - 9 -detector diode 34 is mounted behind and receives light through the plastic encapsulation of, the 1R transmitting diode 33. This approach has great cost advantages as it facilitates the retrofitting of learning capability to existing remote control designs since no retooling of the plastic case is needed to accommodate a separate 1R receiver. As a result, an existing remote control design can be retrofit to have a learning capability merely by adding an IR photo detector diode 34 on to the circuit board of the remote control device being retrofit. No changes in case design are necessary (i.e., no modifications to the case are necessary to enable the remote control to accomplish the task of receiving light to the IR photo detector diode 34).
While the invention has been particularly shown and described with reference to a particular embodiment thereof it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
353331.2 - 1 ~ -
Infrared remote control transmitters for controlling various functions of television receivers, VCR's, cable decoders and auxiliary equipment have become quite widespread in recent years. The result is often that a user is confronted with a number of different remote controls for controlling various devices made by different manufacturers. Most manufacturers provide transmitters to control their various devices, i.e., TV, VCR, stereo, by re-configuring the transmitter keyboard with a key or switch or the like, and devices of different manufacturers are controlled with different "dedicated" remote control devices. To minimize the number of individual remote control devices a user requires, "learning" universal remote control transmitters have been developed. In a common method of setting up and using universal remote controls, the IR function codes that are to be learned are made available from a teaching transmitter. Learning is accomplished by positioning the teaching and learning transmitters such that IR signals from the teaching transmitter are received by the learning transmitter (remote control device). Next, a program is followed which includes sequentially transmitting the IR function codes associated with the keys of the teaching transmitter to the learning transmitter. The learning transmitter stores the detected 1R function codes in its memory and essentially re-configures its keyboard so that the appropriate IR function codes may be transmitted to the device to be controlled. Television sets, VCR's, entertainment media, and other devices can thus employ universal or standard remote 353331.2 controls that can be adapted to control various and sundry brands. Thus, universal remote control devices can learn the commands for controlling each of the various brands and types of devices.
U.S. Patent No. 5,691,710 issued to Pietraszak et al. and assigned to Zenith Electronics Corp. discloses a self learning IR remote control transmitter of the type mentioned above. U.S.
Patent No. 5,255,313 issued to Darbee and assigned to Universal Electronics Inc., and U.S. Patent No. 5,552,917 issued to Darbee et al. and assigned to Universal Electronics Inc. also disclose universal remote control systems. The present invention provides an improvement to the circuitry of the systems disclosed in the above-mentioned patents.
It is known that, in addition to the ability of light emitting diodes ("LED's ") to provide IR
signals, LEDs may also have the ability to receive, be sensitive to, and react to incoming light.
One such receiver type of IR circuit is disclosed in U.S. Patent No.
4,933,563, issued to Thus and assigned to U.S. Philips Corp. Some of the embodiments disclosed in the present invention exploit this dual effect or capability of 1R diodes to transmit and receiver IR signals; this feature minimizes the circuitry used with learning remote controls, and also facilitates the retrofitting of learning capability to existing remote control designs, since no re-tooling of the plastic case is needed to accommodate a separate IR receiver.
Summary of the Invention This invention provides improved IR diode circuits for use with learning remote controls.
In some of the disclosed embodiments, the same IR LED is utilized to transmit and to receive IR
signals; and, the inventive circuitry is a component of the 1R output circuit for a remote control.
In another of the disclosed embodiments, improved circuitry is provided for a transmitter 1R LED
353331.2 - 2 -and a separate receiver IR photo detector diode, and a method if disclosed whereby the IR photo detector can be mounted behind, and receives light input through the plastic encapsulation of, the transmitter IR LED.
The foregoing features and advantages of the present invention will be apparent from the following more particular description of the invention. The accompanying drawings, listed hereinbelow, are useful in explaining the invention.
Brief Description of the Drawings Fig. 1 shows a circuit for providing IR signals and indicates the 1R receiver section or addition in accordance with the invention;
Fig. 2 is similar to Fig. 1 and includes a transistor amplifier that effectively provides greater light sensitivity;
Fig. 3 adds a linear amplifier to the circuit of Fig. 2 to provide a circuit which is even more sensitive;
Fig. 4 is another embodiment of the invention wherein an IR transmitter LED is used with or without an IR photo detector diode; and, Fig. 5 is a partial view of a case wherein the circuitry of Fig. 4 may be utilized.
Description of the Invention Figure 1 shows a basic schematic circuit 10 of the invention. The circuit 10 of Fig. 1 includes a typical remote IR output circuit 12, with an 1R LED ("infra-red light emitting diode") D1, which provides an 1R output when switching transistor Q2 receives a drive signal. When a 353331.2 - 3 -remote is transmitting, the infra-red (IR) signal is provided by diode D 1, which is effectively connected to the power supply by transistor switch Q2. Resistor R4 limits the current flow through diode D1. The remote 1R output circuit labeled 12 on the left of the vertical dotted line in Figs. 1-3, is known in the art.
The circuit 11 exploits the dual effect or capability of some IR diodes to: a) transmit IR
signals; and b) to receive and react to incoming light to generate photocurrents/photovoltages; that is, IR diode D1 functions both as a transmitter and as a receiver.
In the circuit 12, if the drive signal is not present on lead 16, the electrical path from the power supply Vcc through IR diode D1 to ground is disconnected by transistor Q2 and the remote will not transmit an IR signal. Stated in another way, when the diode D1 is not connected to the power supply in response to the 1R drive signal on lead 16, it (diode D 1 ) is available for use as a receiving diode. The circuitry of Fig. I can thus make use of photo cwrents and/or voltages that are generated by light impinging on diode D1 to provide signals which are amplified and processed by circuit 11 for use by external circuitry.
The IR receiver circuit 11 includes PNP transistor QI that has its emitter connected to the power supply voltage Vcc. The collector of transistor Q1 is connected through resistor R3 to ground reference. The base of transistor Q1 is connected through resistor R1 to the cathode of diode D 1, and through resistor R 1 and R2 to the power supply. Resistor R1 protects transistor Q1 from short-circuiting the diode D1 when the IR driving circuit, including switching transistor Q2, is activated.
Resistor R2 is a relatively large resistor that removes built up charge generated by the diode D1 when Dl is receiving light. A large value of resistor R2 increases sensitivity to light, 353331.2 - 4 -but slows response time. A small value of R2 increases response time, but lowers sensitivity.
Accordingly, the value of resistor R2 is selected dependent on the response desired.
The signal output of transistor Q1 is taken across resistor R3 on lead 17. A
small value of resistor R3 increases speed, a large value of resistor R3 increases sensitivity. Again, the value of resistor R3 is selected based on the response desired.
Under normal lighting conditions, the resistors R1, RZ and R3 are selected so that any voltage developed by D1 is not enough to turn On transistor Q1; and, diode Dl is thus controlled to turn On transistor Q1 (only) in response to signals received from the associated teaching transmitter. The circuit of Fig. 1 draws no power unless an IR drive signal is applied to the circuit. This eliminates the requirement for another microprocessor port pin and power switch circuit.
As mentioned above, in operation, when an IR drive signal is provided to transistor Q2, transistor Q2 conducts and switches the IR diode D1 On to provide an output IR
signal. When the drive signal goes Off, transistor Q2 opens, and diode D1 is effectively disconnected from the power source and ceases to provide an IR signal. Diode D1 is sensitive to received light (light impinging thereon) and when transistor Q1 opens, diode D 1 generates a photocurrent/voltage that turns On transistor Ql; this provides a signal output across resistor R3. This generated signal is coupled to external circuitry through lead 17.
Thus, when the diode D 1 is not providing an IR signal, it is made available for use as a receiving diode. Note that the 1R signal developed by diode D 1 in response to the 1R drive signal is substantially larger than the photocurrents/voltages developed in response to received light. The circuit of Fig. 1 will amplify the output developed by diode D1 from any received light, but will 353331.2 ' S ' not interfere with 1R signal transmission. The output of circuit 11 can thus be used by a microprocessor as a signal source in the learning of a received signal.
Figure 2 shows a circuit similar to Fig. 1, but with higher sensitivity.
Figure 2 adds NPN
transistor Q3 and resistor R5 to the circuit of Fig. 2. In Fig. 2, the output of transistor Q1 is connected through lead 19 to the base of transistor Q3. The collector of transistor Q3 is connected through resistor RS to power sowce Vcc, and the emitter of transistor Q3 is connected to ground.
The signal output is coupled through lead 17. Thus, transistor Q3 and resistor RS comprise a second amplifier stage that increases sensitivity to received signals.
Similarly as in the circuit of Fig. 1, the circuit of Fig. 2 draws no power unless an 1R drive signal is applied to the circuit.
Fig. 3 shows another circuit with even higher sensitivity. In Fig. 3, an NPN
transistor Q1A is connected in the circuit to provide linear amplification between switching transistor Q2 and output transistor Q3. The base of transistor Q 1 A is connected through series capacitor C 1 to the junction of transistor Q2 and diode D1 and through resistor R2 to power source Vcc. A
second capacitor C6 is connected in parallel to capacitor C1. The base of transistor Q1A is also connected through resistor R9 to neutral. The base of transistor Q1A is connected through resistor R3 to power source Vcc and through capacitor C4 to neutral. The emitter of transistor Q1A is connected through resistor RS to neutral. Capacitors C2 and CS are connected in parallel across resistor R5. The collector of transistor QIA is connected through resistor R6 to power source Vcc. The output of trans istor Q 1 A is developed at the junction of the collector of Q 1 A and resistor R6. The output is connected through capacitor C7 and resistor R7 to the base of transistor Q3. A second capacitor C3 is connected in parallel with capacitor C7. A
reverse connected diode D2 has its cathode connected to the base of transistor Q3 and its anode connected to neutral.
353331.2 - 6 -Transistor Q1A and the indicated circuitry form a linear amplifier with a large frequency response, as is known. Transistor Q3 and capacitors C3, C7, diode D2 and resistors R7 and R8 form a switching stage that converts the signals generated by diode D1 to signals usable by a microprocessor. Neutral is connected to ground by switch SW1 in response to a control signal from the host processor on switch control input. This is needed since the amplifier draws current continuously when connected across its power source. SWI is typically a transistor switch circuit.
Fig. 4 shows additional embodiments of the invention. One embodiment of the circuit of Fig. 4 is essentially similar to the embodiments of Figs. 1-3 wherein the same IR diode is used both for transmitting and receiving. (Note that in this embodiment photo detector diode D11 is not in the circuit, this is indicated by the dotted line).
The first embodiment of the circuit of Fig. 4 includes the 1R LED D 10 which has its anode connected to a battery supply and its cathode connected to the emitter of PNP
transistor switch Q6.
The collector of transistor Q6 is connected through res istor R 10 to ground reference. The base of transistor Q6 is connected through resistor R14 to positive bias. The base of transistor Q6 receives its control signal input via control line 21 through resistor R12.
Note that transistor Q6 is a PNP transistor and used in lieu of the NPN input transistor Q2 of Figs. 1-3; hence, transistor Q6 is driven on by a signal of the opposite polarity, all as is well known.
When transistor Q6 is turned on, LED D10 conducts and provides an 1R output. As in the case of the circuits of Figs.
1-3, when the transistor switch Q6 is turned off, the LED D 10 functions as a photo detector and the signal developed is coupled through line or lead 22 as an input to a signal amplifier 25, to be described.
353331.2 ' 7 -A second visible LED D6 has an anode connected to battery supply VBATT and its cathode connected through resistor R12 in control in 24. LED D6 can be of a red color and provide an output such as for indicating the state of the circuit.
Amplifier 25 comprises a PNP transistor Q7 and a NPN transistor Q8. As alluded to above, in one embodiment the base of transistor Q7 is connected through resistor R18 to LED
D10, and in another embodiment, the base of transistor Q7 is connected through resistor R18 to photo detector diode D 11. The emitter of transistor Q7 is connected to a battery supply, and its collector is connected through resistor R16 to a neutral. A capacitor C11 is connected in parallel with resistor R16. A diode D8 has its anode connected to a battery supply and its cathode connected through resistor R19 to the base of transistor Q7. The junction of diode D8 and resistor R19 is connected through resistor R17 to neutral.
The output of transistor Q7 is coupled from its collector to the base of PNP
transistor Q8.
The collector of transistor Q8 is connected through resistor R20 to a battery supply and its emitter is connected to neutral . A capacitor C 12 is connected across transistor Q8 and resistor R20 to provide a stable voltage and assure that a clean digital signal is provided by transistor Q8, all as is known. The output of transistor Q8 and hence of amplifier 25 is taken from the collector of transistor Q8. As mentioned above, the circuit of the first embodiment of Fig.
4, which circuit includes lead 22 but not photo detector diode D 11, operates similarly to the circuits of Figs. 1-3 to amplify the photocurrents/voltages generated by the LED in response to received light pulses and provide electrical output signals. Neutral is connected to ground by switch SWI in response to a control signal from the host processor on switch control input. This is needed since the 353331.2 ' 8 ' amplifier draws current continuously when connected across its power source.
SWI is typically a transistor switch circuit.
In the other embodiment of the circuit of Fig. 4, a separate IR photo detector diode D 11 is connected in the circuit of Fig. 4. (As stated above, this embodiment includes diode D 11 but not lead 22). Diode D11 has its anode connected to battery supply VBATT and its cathode connected through a resistor R18 to the emitter of PNP transistor Q7 of amplifier 25. In this embod invent, the operation of photo diode D 11 is effectively separate from that of LED D 10.
In operation during the receiving mode, IR photo detector diode D 11 is energized by received light pulses. When LED D7 receives an input light pulse it generates a photocurrent thereby providing a signal to turn on transistor Q7. When transistor Q7 conducts, the voltage across resistor R16 goes high, causing transistor Q8 to turn off thereby providing a low output at the collector of transistor Q8 and hence a low voltage output on lead 28. As will be readily appreciated, amplifier 25 thus provides a digital output signal on lead 28 in response to light pulses received by IR photo detector diode D11.
Fig. 5 shows a partial view of a remote control unit wherein the circuitry of Fig. 1-4 can be positioned. A printed circuit board 31 containing the desired one of the circuits of Figs. 1-4 is mounted within a plastic case 30, usually of an elongated and flat design.
A transmitting IR
LED 33 is positioned at the end of the case 30 to extend outwardly. If the embodiment with a separate IR photo detector diode is utilized, a receiving photo detector diode 34, is positioned on the printed circuit board 31 to be located behind and near the IR transmitting diode 33. IR energy from the teaching transmitter will radiate through the translucent encapsulation of the 1R
transmitting diode and stimulate the photo detector diode 34. In other words, the IR photo 353331.2 - 9 -detector diode 34 is mounted behind and receives light through the plastic encapsulation of, the 1R transmitting diode 33. This approach has great cost advantages as it facilitates the retrofitting of learning capability to existing remote control designs since no retooling of the plastic case is needed to accommodate a separate 1R receiver. As a result, an existing remote control design can be retrofit to have a learning capability merely by adding an IR photo detector diode 34 on to the circuit board of the remote control device being retrofit. No changes in case design are necessary (i.e., no modifications to the case are necessary to enable the remote control to accomplish the task of receiving light to the IR photo detector diode 34).
While the invention has been particularly shown and described with reference to a particular embodiment thereof it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
353331.2 - 1 ~ -
Claims (15)
1. A learning type remote control including circuitry connectable to a supply voltage which circuitry includes:
a) an infra-red (IR) diode, said IR diode being sensitive to received light and capable of generating photocurrents/voltages in response to said received light;
b) a switch responsive to an associated drive signal, said switch selectively connecting and disconnecting said IR diode from said supply voltage to provide an output IR signal in response to said drive signal; and c) an amplifier connected to said IR diode to provide photocurrents/voltages in response to light directed to said IR diode, said IR diode functioning as a light receiver only when said switch disconnects said IR diode from responding to said drive signal.
a) an infra-red (IR) diode, said IR diode being sensitive to received light and capable of generating photocurrents/voltages in response to said received light;
b) a switch responsive to an associated drive signal, said switch selectively connecting and disconnecting said IR diode from said supply voltage to provide an output IR signal in response to said drive signal; and c) an amplifier connected to said IR diode to provide photocurrents/voltages in response to light directed to said IR diode, said IR diode functioning as a light receiver only when said switch disconnects said IR diode from responding to said drive signal.
2. A learning type remote control including the circuitry as in Claim 1 wherein under normal light conditions the voltage developed by said IR diode is not sufficient to turn on said amplifier, and said amplifier circuit draws no power unless an infrared-red signal is applied thereto.
3. A learning type remote control including the circuitry as in Claim 1 further including first and second amplifier means to enhance the sensitivity of said circuitry.
4. A learning type remote control including the circuitry as in Claim 1 further including a resistor for removing built-up charge generated by the IR diode when receiving light.
5. A learning type remote control including the circuitry as in Claim 1 wherein a large resistance increases sensitivity to light, but slows down response time.
6. A learning type remote control including the circuitry as in Claim 4 wherein the voltage drop across said resistor is used as a signal output and wherein a small value of said resistor increases speed, and a large value of said resistor increases sensitivity.
7. A learning type remote control including circuitry connectable to a supply voltage which circuitry includes:
a) an infra-red (IR) diode, said IR diode being sensitive to received light and capable of generating photocurrents/voltages in response to said received light, b) switching means responsive to an associated drive signal, said switching means selectively connecting and disconnecting said IR diode from said supply voltage to provide an output IR signal in response to said associated drive signal;
c) first amplifying means connecting said IR diode to provide photocurrents/voltages in response to light directed to said IR diode;
d) second amplifying means receiving the output from said first amplifying means to further amplify said photocurrents/voltages; and, e) resistor means connected respectively in series with said first and second amplifying means to selectively control the sensitivity and speed of response of said first and second amplifying means.
a) an infra-red (IR) diode, said IR diode being sensitive to received light and capable of generating photocurrents/voltages in response to said received light, b) switching means responsive to an associated drive signal, said switching means selectively connecting and disconnecting said IR diode from said supply voltage to provide an output IR signal in response to said associated drive signal;
c) first amplifying means connecting said IR diode to provide photocurrents/voltages in response to light directed to said IR diode;
d) second amplifying means receiving the output from said first amplifying means to further amplify said photocurrents/voltages; and, e) resistor means connected respectively in series with said first and second amplifying means to selectively control the sensitivity and speed of response of said first and second amplifying means.
8. A learning type remote control including the circuitry as in Claim 7 useful with an associated microprocessor wherein the signal provided by said IR diode functioning as a receiver is useful to said microprocessor as a signal source for learning a received signal.
9. A learning type remote control including the circuitry as in Claim 8 wherein said circuit comprises a first semi-conductor linear amplifier with a large frequency response, and a second switching stage for converting the signal generated by said IR diode into a form useable by said microprocessor.
10. A learning type remote control including the circuitry as in Claim 8 wherein said IR diode eliminates the need for a separate microprocessor port pin and power switch circuit.
11. Remote control device circuitry connectable to a supply voltage which circuitry comprises:
a) an infra-red (IR) LED connected to transmit IR pulses;
b) a photo detector diode connected to receive light pulses;
c) switching means for selectively connecting and disconnecting said LED and said photo detector diode to a supply voltage to selectively transmit IR pulses and to respond to light pulses to provide output signals responsive to an associated drive signal; and d) signal amplifier means.
a) an infra-red (IR) LED connected to transmit IR pulses;
b) a photo detector diode connected to receive light pulses;
c) switching means for selectively connecting and disconnecting said LED and said photo detector diode to a supply voltage to selectively transmit IR pulses and to respond to light pulses to provide output signals responsive to an associated drive signal; and d) signal amplifier means.
12. Remote control device circuitry as in Claim 11 wherein said IR LED and said photo detector diode operate independently of one another.
13. Remote control device circuitry as in Claim 11 further including a second IR LED
connected to provide an indication of the state of the circuitry.
connected to provide an indication of the state of the circuitry.
14. Remote control device circuitry as in Claim 11 wherein said circuitry, LED
and photo detector diode are mounted in a case, said LED being mounted to extend outward of said case, and said photo detector diode being mounted in said case relatively behind said IR LED, whereby IR energy will radiate through said IR LED and stimulate said photo detector diode.
and photo detector diode are mounted in a case, said LED being mounted to extend outward of said case, and said photo detector diode being mounted in said case relatively behind said IR LED, whereby IR energy will radiate through said IR LED and stimulate said photo detector diode.
15. A learning type remote control including both a transmitting diode and photo detector diode mounted in the remote control case wherein the transmitting diode is mounted to extend outside of said case and said photo detector is mounted on a circuit board of the remote control behind said transmitting diode whereby IR energy can radiate through said transmitter diode to said photo detector diode.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/080,125 US6330091B1 (en) | 1998-05-15 | 1998-05-15 | IR receiver using IR transmitting diode |
| US09/080,125 | 1998-05-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2268593A1 true CA2268593A1 (en) | 1999-11-15 |
Family
ID=22155413
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002268593A Abandoned CA2268593A1 (en) | 1998-05-15 | 1999-04-14 | Ir receiver using ir transmitting diode |
Country Status (4)
| Country | Link |
|---|---|
| US (3) | US6330091B1 (en) |
| EP (1) | EP0962905A3 (en) |
| CA (1) | CA2268593A1 (en) |
| DE (1) | DE99108376T1 (en) |
Families Citing this family (45)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6330091B1 (en) * | 1998-05-15 | 2001-12-11 | Universal Electronics Inc. | IR receiver using IR transmitting diode |
| US8531276B2 (en) | 2000-03-15 | 2013-09-10 | Logitech Europe S.A. | State-based remote control system |
| US20010033243A1 (en) | 2000-03-15 | 2001-10-25 | Harris Glen Mclean | Online remote control configuration system |
| US7283059B2 (en) * | 2000-03-15 | 2007-10-16 | Logitech Europe S.A. | Remote control multimedia content listing system |
| US6784805B2 (en) | 2000-03-15 | 2004-08-31 | Intrigue Technologies Inc. | State-based remote control system |
| US7313589B2 (en) * | 2001-09-28 | 2007-12-25 | Infocus Corporation | Network projector interface system |
| SG108829A1 (en) * | 2001-12-14 | 2005-02-28 | Agilent Technologies Inc | Photo-receiver arrangement |
| US8402185B2 (en) * | 2001-12-26 | 2013-03-19 | Seiko Epson Corporation | Display device adapter with digital media interface |
| US6860609B2 (en) * | 2001-12-26 | 2005-03-01 | Infocus Corporation | Image-rendering device |
| US6664744B2 (en) * | 2002-04-03 | 2003-12-16 | Mitsubishi Electric Research Laboratories, Inc. | Automatic backlight for handheld devices |
| US7170606B2 (en) * | 2002-09-20 | 2007-01-30 | Mitsubishi Electric Research Laboratories, Inc. | Multi-way LED-based surface reflectance sensor and spectrophotometer |
| EP1631882A4 (en) * | 2003-06-02 | 2011-10-05 | Seiko Epson Corp | Image display device and method of announcing a presence of an image display device over network |
| CN100478938C (en) | 2003-06-02 | 2009-04-15 | 富可视公司 | Image capture method, system and apparatus |
| US7945785B2 (en) * | 2003-06-02 | 2011-05-17 | Seiko Epson Corporation | Security of data over a network |
| EP1654834A4 (en) * | 2003-08-14 | 2012-07-04 | Seiko Epson Corp | Apparatus, system and method of transmitting data |
| US8060745B2 (en) * | 2003-12-16 | 2011-11-15 | Seiko Epson Corporation | Security for wireless transmission |
| US7797369B2 (en) * | 2003-12-16 | 2010-09-14 | Seiko Epson Corporation | System and method for controlling a transmission of image data to a display device |
| US7483583B2 (en) * | 2003-12-16 | 2009-01-27 | Infocus Corporation | System and method for processing image data |
| US7643182B2 (en) * | 2003-12-16 | 2010-01-05 | Seiko Epson Corporation | System and method for processing image data |
| US7764832B2 (en) * | 2003-12-16 | 2010-07-27 | Seiko Epson Corporation | System and method for processing image data for color space conversion |
| US20050128520A1 (en) * | 2003-12-16 | 2005-06-16 | Jeff Glickman | Digital signature protection for software |
| US20050128054A1 (en) * | 2003-12-16 | 2005-06-16 | Jeff Glickman | Method, system, and apparatus to identify and transmit data to an image display |
| US7373192B2 (en) * | 2004-02-25 | 2008-05-13 | Nellcor Puritan Bennett Inc. | Oximeter red and IR zero calibration control |
| US8277297B2 (en) | 2004-11-03 | 2012-10-02 | Mattel, Inc. | Gaming system |
| US20060111183A1 (en) * | 2004-11-03 | 2006-05-25 | Peter Maclver | Remote control |
| US20060111184A1 (en) * | 2004-11-03 | 2006-05-25 | Peter Maclver | Gaming system |
| US8382567B2 (en) | 2004-11-03 | 2013-02-26 | Mattel, Inc. | Interactive DVD gaming systems |
| US7331857B2 (en) | 2004-11-03 | 2008-02-19 | Mattel, Inc. | Gaming system |
| DE102006018238A1 (en) | 2005-04-20 | 2007-03-29 | Logitech Europe S.A. | Remote control system for home theater system, analyzes log of events stored by remote controller to identify patterns of interest in logged use of remote controller |
| JP4718240B2 (en) * | 2005-05-24 | 2011-07-06 | 日東光学株式会社 | Data communication apparatus and electronic device |
| US20070008307A1 (en) * | 2005-07-11 | 2007-01-11 | Infocus Corporation | Dual function control device |
| DE102005036937B4 (en) * | 2005-08-05 | 2014-02-13 | Diehl Ako Stiftung & Co. Kg | Evaluation circuit for an optical receiver |
| US20070233731A1 (en) * | 2006-02-22 | 2007-10-04 | Logitech Europe S.A. | System and method for configuring media systems |
| US7958355B2 (en) * | 2006-03-01 | 2011-06-07 | Microsoft Corporation | Keytote component |
| JP5536043B2 (en) * | 2008-05-30 | 2014-07-02 | コーニンクレッカ フィリップス エヌ ヴェ | Round lighting equipment |
| US20100085328A1 (en) * | 2008-10-08 | 2010-04-08 | Hewlett-Packard Development Company, L.P. | Touch-Sensitive Display Device And Method |
| US8508401B1 (en) | 2010-08-31 | 2013-08-13 | Logitech Europe S.A. | Delay fixing for command codes in a remote control system |
| CN101986363B (en) * | 2010-11-26 | 2012-06-13 | 赛霸电子(深圳)有限公司 | Method for studying remote controller and studying type remote controller |
| US8700106B2 (en) * | 2011-03-09 | 2014-04-15 | Universal Electronics Inc. | System and method for provision of infrared signalling in smart phone devices |
| US8918544B2 (en) | 2011-03-31 | 2014-12-23 | Logitech Europe S.A. | Apparatus and method for configuration and operation of a remote-control system |
| US8745024B2 (en) | 2011-04-29 | 2014-06-03 | Logitech Europe S.A. | Techniques for enhancing content |
| CN103366545A (en) * | 2012-04-11 | 2013-10-23 | 鸿富锦精密工业（深圳）有限公司 | Anti-crosstalk infrared remote control circuit |
| RU2534455C1 (en) * | 2013-05-16 | 2014-11-27 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Южно-Российский государственный университет экономики и сервиса" (ФГБОУ ВПО "ЮРГУЭС") | Fast-response transducer of physical magnitudes with potential output |
| CN109087500A (en) * | 2015-11-06 | 2018-12-25 | 普天智能照明研究院有限公司 | A kind of controller for infrared signal transmitting-receiving |
| US20190041271A1 (en) * | 2017-08-07 | 2019-02-07 | Philip Preston | Method And Assembly For A Wireless Probe And Interrogator |
Family Cites Families (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4317232A (en) * | 1979-01-12 | 1982-02-23 | Deere & Company | Fiber optic signal conditioning circuit |
| JPS5651884A (en) * | 1979-10-03 | 1981-05-09 | Hitachi Ltd | Light sending and recieving element |
| DE3237622A1 (en) * | 1982-10-11 | 1984-04-12 | Bayerische Motoren Werke AG, 8000 München | SECURITY DEVICE |
| FR2606236B1 (en) * | 1986-10-31 | 1988-12-02 | Neiman Sa | SYNCHRONIZATION METHOD AND DEVICE FOR OPTICAL REMOTE CONTROL WITH SCALABLE CODE |
| US4825200A (en) * | 1987-06-25 | 1989-04-25 | Tandy Corporation | Reconfigurable remote control transmitter |
| GB2209105A (en) | 1987-08-26 | 1989-04-26 | Philips Nv | Infra-red receiver |
| US4959810A (en) | 1987-10-14 | 1990-09-25 | Universal Electronics, Inc. | Universal remote control device |
| US5255313A (en) | 1987-12-02 | 1993-10-19 | Universal Electronics Inc. | Universal remote control system |
| NL8802544A (en) * | 1988-10-17 | 1990-05-16 | Philips Nv | RECEIVER FOR APPLICATION IN A REMOTE CONTROL SYSTEM. |
| US5142397A (en) * | 1990-01-04 | 1992-08-25 | Dockery Devan T | System for extending the effective operational range of an infrared remote control system |
| US5075794A (en) * | 1990-11-15 | 1991-12-24 | Amp Incorporated | Reflective opitical feedback element |
| JPH04304798A (en) * | 1991-04-01 | 1992-10-28 | Akai Electric Co Ltd | Learning remote controller |
| US5364108A (en) * | 1992-04-10 | 1994-11-15 | Esnouf Philip S | Game apparatus |
| US5691710A (en) | 1992-11-02 | 1997-11-25 | Zenith Electronics Corporation | Self learning IR remote control transmitter |
| DE19654853A1 (en) * | 1996-05-23 | 1997-11-27 | Ziegler Horst | Optical data transmission and reception circuit using light emitting diode |
| FI105606B (en) * | 1997-10-13 | 2000-09-15 | Nokia Mobile Phones Ltd | Optical communication unit |
| US6330091B1 (en) * | 1998-05-15 | 2001-12-11 | Universal Electronics Inc. | IR receiver using IR transmitting diode |
-
1998
- 1998-05-15 US US09/080,125 patent/US6330091B1/en not_active Expired - Lifetime
-
1999
- 1999-04-14 CA CA002268593A patent/CA2268593A1/en not_active Abandoned
- 1999-04-29 DE DE0000962905T patent/DE99108376T1/en active Pending
- 1999-04-29 EP EP99108376A patent/EP0962905A3/en not_active Withdrawn
-
2001
- 2001-06-22 US US09/888,240 patent/US6701091B2/en not_active Expired - Lifetime
-
2003
- 2003-12-23 US US10/743,933 patent/US6826370B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0962905A3 (en) | 2004-07-21 |
| US6826370B2 (en) | 2004-11-30 |
| US6330091B1 (en) | 2001-12-11 |
| US20010033404A1 (en) | 2001-10-25 |
| US20040136726A1 (en) | 2004-07-15 |
| EP0962905A2 (en) | 1999-12-08 |
| US6701091B2 (en) | 2004-03-02 |
| DE99108376T1 (en) | 2004-05-19 |
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| EEER | Examination request | ||
| FZDE | Dead |