JP2006311053A - Infrared remote control device, and light emitting control method of infrared light emitting diode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an infrared remote control device in which the reduction of power consumption and the stabilization of remote control performance are possible. <P>SOLUTION: The infrared remote control device 30 is provided with an infrared light emitting diode 21, and carries out remote control by emitting light in a desired light emitting pattern of the infrared light emitting diode 21. The device is provided with a voltage detection means 23 which detects a voltage of a power source of the infrared light emitting diode 21, and a light emission intensity changing means 20 which changes the light emission intensity of the infrared light emitting diode 21 according to a voltage value detected by the voltage detection means 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an infrared remote control device, a portable terminal device including the infrared remote control device, a light emission control method of an infrared light emitting diode of the infrared remote control device, and a program thereof.

  Conventionally, a mobile phone provided with an infrared remote control device has been proposed (for example, Patent Documents 1 and 2).

  FIG. 12 is a circuit diagram showing a conventional infrared remote control apparatus 1000 of this type.

  As shown in FIG. 12, a conventional infrared remote control apparatus 1000 includes, for example, a power supply unit 1001, a resistor R1002 connected to the power supply unit 1001 at one end, and an anode terminal connected to the other end of the resistor R1002. An infrared light emitting diode 1003, a transistor TR1004 having a collector terminal connected to the cathode terminal of the infrared light emitting diode 1003 and an emitter terminal connected to the ground, and a control unit 1005 for applying a control signal to the base terminal of the transistor TR1004 , And is configured.

When the control unit 1005 performs on / off control of the transistor TR1004 at a predetermined timing, the infrared light emitting diode 1003 emits light with a desired light emission pattern, and an infrared remote control operation can be performed.
JP 2003-079777 A JP 2003-264612 A

  By the way, in the conventional infrared remote control apparatus 1000 shown in FIG. 12, the current limited by the resistor R1002 is supplied from the power supply unit 1001 to the infrared light emitting diode 1003.

  That is, the current value supplied to the infrared light emitting diode 1003 is changed with the voltage change of the power supply unit 1001, but the current value is set to only one type.

  FIG. 13 is a diagram showing a voltage-current characteristic representing the relationship between the voltage of the power supply unit 1001 and the current of the infrared light emitting diode 1003.

  Among the characteristics shown in FIG. 13, the characteristic (1) indicates that the current flowing through the infrared light emitting diode 1003 is the required minimum current (the one-dot chain line in FIG. 13) when the voltage of the power supply unit 1001 is lowered to the minimum operating voltage of the mobile phone. It is a voltage-current characteristic when the resistance value of the resistor R1002 is set so that The minimum operating voltage means a voltage necessary for the operation of the functional units other than the infrared remote control device 1000 in the mobile phone. The minimum required current means a current value at which the emission intensity of the infrared light emitting diode 1003 becomes a minimum necessary value for performing infrared remote control.

  In the case of the conventional characteristic (1) shown in FIG. 13, when the voltage of the power supply unit 1001 is high, more current than necessary flows in the infrared light emitting diode 1003. For this reason, there existed a problem that the sustainability of the power supply part 1001 which consists of secondary batteries, such as a battery pack, was bad, for example.

  That is, the conventional characteristic (1) shown in FIG. 13 has a problem that the power consumption of the infrared light emitting diode 1003 is large.

  Of the characteristics shown in FIG. 13, the characteristic (2) indicates that the current flowing through the infrared light emitting diode 1003 is the minimum required current (FIG. 13) when the voltage of the power supply unit 1001 is an average value in a normal use state. It is a voltage-current characteristic when the resistance value of the resistor R1002 is set so as to be a one-dot chain line.

  In the case of the conventional characteristic (2) shown in FIG. 13, when the voltage of the power supply unit 1001 is low, the current flowing through the infrared light emitting diode 1003 is lower than the required minimum current. There was a problem that infrared remote control could not be performed due to lack of reach.

  That is, the conventional characteristic (2) shown in FIG. 13 has a problem that the remote control operation cannot be stably performed.

  The present invention has been made to solve the above-described problems, and an infrared remote control device capable of reducing power consumption or stabilizing a remote control operation, a portable terminal device including the infrared remote control device, and an infrared remote control device It is an object of the present invention to provide a light emission control method for an infrared light emitting diode and a program therefor.

  In order to solve the above problems, an infrared remote control device according to the present invention includes an infrared light emitting diode, and performs remote control by causing the infrared light emitting diode to emit light in a desired light emission pattern. It is characterized by comprising emission intensity changing means for changing the emission intensity.

  In the infrared remote control device of the present invention, the infrared remote control device further comprises voltage detection means for detecting the voltage of the power source of the infrared light emitting diode, and the light emission intensity changing means is configured according to the voltage value detected by the voltage detection means. It is preferable to change the emission intensity of the infrared light emitting diode.

  In the infrared remote control device of the present invention, the light emission intensity changing means relatively weakens the light emission intensity of the infrared light emitting diode when the voltage value detected by the voltage detection means is a relatively high voltage. On the other hand, when the voltage value detected by the voltage detection means is a relatively low voltage, it is preferable to make the emission intensity of the infrared light emitting diode relatively strong.

  Alternatively, in the infrared remote control device of the present invention, the infrared remote control device further includes operation means operated by a user, and the emission intensity changing means changes the emission intensity of the infrared light emitting diode in response to an operation on the operation means. It is also preferable.

  In the infrared remote control device of the present invention, the light emission intensity changing means changes the resistance value for limiting the current supplied from the power source of the infrared light emitting diode to the infrared light emitting diode, thereby the infrared light emitting diode. It is preferable to change the emission intensity.

  In the infrared remote control device of the present invention, between the power source of the infrared light emitting diode and the infrared light emitting diode, a plurality of resistors connected in series with each other, the resistance selected among these resistors, It is preferably used for limiting the current supplied from the power source to the infrared light emitting diode.

  In the infrared remote control device of the present invention, the emission intensity changing means preferably sets the emission intensity of the infrared light emitting diode to one of two intensity levels.

  In this case, it is preferable that the light emission intensity changing means sets the light emission intensity of the infrared light emitting diode by one intensity setting switch.

  Examples of the strength setting switch include an analog switch and a field effect transistor.

  In the infrared remote control device of the present invention, it is also preferable that the light emission intensity changing means sets the light emission intensity of the infrared light emitting diode to any one of three or more levels. As an intensity setting switch for setting the emission intensity of the infrared light emitting diode in this case, for example, an analog switch or a field effect transistor can be applied.

  In the infrared remote control device of the present invention, it is preferable that on / off switching of the infrared light emitting diode for causing the infrared light emitting diode to emit light in the desired light emission pattern is performed by one on / off switching switch.

  Examples of the on / off switching switch include a bipolar transistor and a field effect transistor.

  Moreover, the portable terminal device of the present invention is characterized by including the infrared remote control device of the present invention.

  The mobile terminal device of the present invention is preferably a mobile communication terminal device (for example, a mobile phone) having a communication function.

  Or it is also preferable that the portable terminal device of this invention is a portable information terminal device which has an information processing function.

  Further, the light emission control method of the infrared light emitting diode according to the present invention includes an infrared light emitting diode, and causes the infrared light emitting diode to emit light in an infrared remote control device that performs remote control by causing the infrared light emitting diode to emit light in a desired light emission pattern. A method of controlling, comprising: an intensity changing process for changing the emission intensity of the infrared light emitting diode; and a process of causing the infrared light emitting diode to emit light in a desired light emission pattern with the emission intensity after the change due to the intensity changing process. It is characterized by that.

  Further, the light emission control method of the infrared light emitting diode according to the present invention includes an infrared light emitting diode, and causes the infrared light emitting diode to emit light in an infrared remote control device that performs remote control by emitting light with the desired light emission pattern. A voltage detection process for detecting a power supply voltage of the infrared light emitting diode, and an intensity changing process for changing a light emission intensity of the infrared light emitting diode according to a voltage value detected by the voltage detection process. And a process of causing the infrared light emitting diode to emit light in a desired light emission pattern with the light emission intensity after the change due to the intensity change process.

  Further, the light emission control method of the infrared light emitting diode according to the present invention includes an infrared light emitting diode, and causes the infrared light emitting diode to emit light in an infrared remote control device that performs remote control by emitting light with the desired light emission pattern. An operation detection process for detecting an operation by a user, an intensity changing process for changing an emission intensity of the infrared light emitting diode according to a type of operation detected by the operation detection process, And the step of causing the infrared light emitting diode to emit light in a desired light emission pattern with the light emission intensity after the change due to the intensity change process.

  The program of the present invention is a program for causing a computer to execute a light emission control method of an infrared light emitting diode.

  According to the present invention, the power consumption of the infrared remote control device can be reduced, or the remote control operation can be reliably and stably performed.

  Embodiments according to the present invention will be described below with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram showing the configuration of the mobile phone 100 according to the first embodiment.

  As shown in FIG. 1, a mobile phone (mobile terminal device, mobile communication terminal device) 100 according to the first embodiment includes, for example, an operation unit 11 composed of a plurality of operation keys and operated by a user, and a liquid crystal display, for example. A display unit 12 that includes various devices and performs various display operations, a wireless unit 13 that performs wireless communication, a sound generation unit (speaker) 14 that performs a sound generation operation, a reception unit (microphone) 15 that performs a reception operation, and various controls An infrared remote control unit (including a control unit 20 that operates, a power source unit 22 that is a power source of the mobile phone 100, and a power source unit (power source) 22 and a control unit (light emission intensity changing means) 20 Infrared remote control device) 30.

  The wireless unit 13 includes an antenna (not shown), and transmits / receives a wireless signal to / from the outside (for example, a wireless base station) using the antenna.

  The wireless unit 13 demodulates the received wireless signal and inputs the demodulated signal to the control unit 20.

  Based on the signal from the wireless unit 13, the control unit 20 causes the sounding unit 14 to perform a sounding operation (such as a sounding operation of the other party's voice during a call) or display on the display unit 12, for example To perform an operation (such as a display operation indicating that a call is in progress).

  Further, the radio unit 13 modulates the audio signal from the control unit 20 (generated based on the audio input from the receiver unit 15) and the control signal from the control unit 20 to convert the signal into a radio signal, and converts the radio signal to the antenna. Send to the outside more.

  The mobile phone 100 can perform communication functions such as telephone calls, transmission / reception of e-mails, and Internet connection by performing wireless communication via the wireless unit 13 as described above.

  The control unit 20 includes, for example, a CPU that performs various control operations including operation control of the display unit 12, the radio unit 13, and the sound generation unit 14, and a ROM that stores various control programs (programs) executed by the CPU. (Recording medium) and a RAM functioning as a work area of the CPU. The operation of the control unit 20 is performed according to a control program stored in the ROM.

  The infrared remote control unit 30 includes an infrared LED (infrared light emitting diode) 21 that emits infrared light, and an on / off state of the infrared LED 21 in addition to the control unit (light emission intensity changing means) 20 and the power source unit (power source) 22. An on / off switching transistor (on / off switching switch) TR1 that performs the switching operation under the control of the control unit 20, and first and second resistors that limit the current supplied from the power supply unit 22 to the infrared LED 21 ( Resistors) R1, R2, a resistance value switching analog switch (intensity setting switch) ASW1 for switching a resistance value for limiting a current supplied from the power supply unit 22 to the infrared LED 21, and a voltage supplied from the power supply unit 22 And a voltage detection unit (voltage detection means) 23 for detecting the value of.

  The power supply unit 22 is a rechargeable secondary battery such as a battery pack, and supplies power to the control unit 20 via the voltage detection unit 23, for example. The control unit 20 supplies the power supplied from the power supply unit 22 to the display unit 12, the radio unit 13, the sound generation unit 14, and the like.

  The power supply unit 22 also supplies power to the infrared LED 21 via both the first and second resistors R1 and R2 or only through the first resistor R1.

  One terminal of the first resistor R <b> 1 is connected to the power supply unit 22. The other terminal of the first resistor R1 is connected to one terminal of the second resistor R2.

  The other terminal of the second resistor R2 is connected to the anode terminal of the infrared LED 21.

  The cathode terminal of the infrared LED 21 is connected to the collector terminal of the on / off switching transistor TR1.

  The base terminal of the on / off switching transistor TR1 is connected to the control unit 20, and the emitter terminal is connected to the ground.

  In the present embodiment, the on / off switching transistor TR1 is composed of, for example, a bipolar N-channel transistor.

  When the on / off switching transistor TR1 is turned on, a current is supplied to the infrared light emitting LED 21 from the power supply unit 22, and the infrared light emitting LED 21 emits light.

  Therefore, when the control unit 20 turns on / off the transistor TR1 for on / off switching at a desired timing, the infrared light emitting LED 21 emits light with a desired light emission pattern. Such light emission of the infrared light emitting LED 21 functions as a control signal for the irradiated device (not shown). That is, the irradiated device of the light emitted from the infrared light emitting LED 21 is remotely controlled by receiving the light emission.

  Note that the trigger of light emission of the infrared light emitting LED 21 for remote control, that is, the trigger of on / off switching of the on / off switching transistor TR1 is, for example, that the control unit 20 detects a remote control operation on the operation unit 11. It is mentioned that.

  Further, the control terminal of the resistance value switching analog switch ASW 1 is connected to the control unit 20.

  Further, of the other two terminals of the resistance value switching analog switch ASW1, one terminal is connected to a connection point between the first resistor R1 and the second resistor R2, and the other terminal is connected to the first terminal. 2 is connected to a connection point between the resistor R2 and the cathode terminal of the infrared LED 21.

  The voltage detection unit 23 is connected to the power supply unit 22 and the control unit 20, and outputs a detection result obtained by detecting the voltage of the power supply unit 22 to the control unit 20.

  The control unit 20 compares the detection result (voltage value of the power supply unit 22) by the voltage detection unit 23 with a preset reference value, and turns on or turns off the resistance value switching analog switch ASW1 according to the comparison result. Turn off.

  That is, when the detection result by the voltage detection unit 23 is higher than a preset reference value, the control unit 20 turns off the resistance value switching analog switch ASW1, while setting the preset reference value. When the voltage is not higher than the value (when it is equal to or lower than a preset reference value), the resistance value switching analog switch ASW1 is turned on.

  When the resistance value switching analog switch ASW1 is off, the supply current from the power supply unit 22 to the infrared LED 21 is limited by both the first and second resistors R1 and R2. Therefore, the current of the infrared LED 21 becomes smaller, and the emission intensity of the infrared LED 21 becomes weaker. That is, when the resistance value switching analog switch ASW1 is off, for example, when the control unit 20 detects a remote control operation to the operation unit 11 or the like, the control unit 20 has a weak emission intensity. The infrared LED 21 is caused to emit light with a desired light emission pattern.

  On the other hand, when the resistance value switching analog switch ASW1 is on, both terminals of the second resistor R2 are connected to each other, so that the supply current from the power source 22 to the infrared LED 21 is the first and second. Of the resistors R1 and R2, the first resistor R1 limits only. Therefore, the current of the infrared LED 21 becomes larger, and the emission intensity of the infrared LED 21 becomes stronger. That is, when the resistance value switching analog switch ASW1 is on, for example, when the control unit 20 detects a remote control operation on the operation unit 11, the control unit 20 has a higher light emission intensity. The infrared LED 21 is caused to emit light with a desired light emission pattern.

  As described above, when the voltage value detected by the voltage detection unit 23 is equal to or lower than the reference value (when the voltage value is relatively low), the control unit 20 increases the emission intensity of the infrared LED 21 while detecting the voltage. When the voltage value detected by the unit 23 is higher than the reference value (when it is a relatively high voltage), the emission intensity of the infrared LED 21 is weakened.

  Further, in this way, the control unit 20 changes the light emission intensity of the infrared LED 21 by changing the resistance value that limits the current supplied to the infrared LED 21 from the power supply unit 22 that is the power source of the infrared LED 21. Let

  As described above, the infrared remote control unit 30 includes a plurality of resistors R1 and R2 connected in series between the power supply unit 22 that is a power source of the infrared LED 21 and the infrared LED 21, and the resistors R1, R2, The resistance selected from R2 (for example, both the first and second resistances or only the first resistance R1) is used for limiting the current supplied to the power source 22 infrared LED 21.

  In this way, the control unit 20 sets the light emission intensity of the infrared LED 21 to one of the two levels.

  In this way, the control unit 20 sets the emission intensity of the infrared LED 21 by turning on / off one resistance value switching analog switch (intensity setting switch) ASW1.

  Further, in this way, on / off switching of the infrared LED 21 for causing the infrared LED 21 to emit light in a desired light emission pattern is performed by one on / off switching transistor (on / off switching switch) TR1.

  In this way, in the infrared remote control unit 30, the control unit 20 applies a desired current to the infrared LED 21 by turning on / off the on / off switching transistor TR1 and the resistance value switching analog switch ASW1, The light emission control of the infrared LED 21 is performed. The current of the infrared LED 21 and the light emission intensity are in a proportional relationship.

  Next, the operation will be described.

  FIG. 2 is a diagram showing voltage-current characteristics representing the relationship between the voltage of the power supply unit 22 and the current flowing through the infrared LED 21.

  When the on / off switching transistor TR1 is in the on state and the resistance value switching analog switch ASW1 is in the off state, the infrared LED 21 is supplied from the power supply unit 22 and is limited by the first and second resistors R1 and R2. Emits light. The voltage-current characteristics at this time are as indicated by AB in FIG. 2 (a straight line connecting point A and point B).

  On the other hand, when the on / off switching transistor TR1 is in the on state and the resistance value switching analog switch ASW1 is in the on state, the infrared LED 21 emits light with a current supplied from the power supply unit 22 and limited by the first resistor R1. To do. The voltage-current characteristic at this time is as indicated by AC in FIG. 2 (a straight line connecting point A and point C).

  When the on / off switching transistor TR1 is in the off state, the infrared LED 21 does not emit light.

  FIG. 3 is a diagram showing the light emission control characteristics of the infrared LED 21 according to the voltage of the power supply unit 22.

  As shown in FIG. 3, when the voltage of the power supply unit 22 is higher than the reference value G (between BD in FIG. 3), the control unit 20 turns off the resistance value switching analog switch ASW1. In this case, when the light emission of the infrared light emitting LED 21 for remote control occurs, the control unit 20 causes the infrared LED 21 to emit light with a desired light emission pattern with a weak light emission intensity. That is, in this case, since the current flowing through the infrared LED 21 is limited by the first and second resistors R1 and R2, the power consumption of the infrared LED 21 is suppressed.

  On the other hand, when the voltage of the power supply unit 22 is not higher than the reference value G (when the reference value G is lower) (between EF in FIG. 3), the control unit 20 turns on the resistance value switching analog switch ASW1. To do. In this case, when the trigger of light emission of the infrared light emitting LED 21 for remote control occurs, the control unit 20 causes the infrared LED 21 to emit light with a desired light emission pattern with a higher light emission intensity. That is, in this case, since the current flowing through the infrared LED 21 is limited only by the first resistor R1 out of the first and second resistors R1 and R2, the current value flowing through the infrared LED 21 even when the voltage of the power supply unit 22 is low. Becomes a sufficient value, and sufficient emission intensity of the infrared LED 21 can be secured.

  In this way, by controlling the resistance value switching analog switch ASW1 in accordance with the voltage of the power supply unit 22, it is possible to change the light emission intensity by changing the current when the infrared LED 21 emits light.

  According to the first embodiment as described above, when the voltage of the power supply unit 22 is high, the current of the infrared LED 21 is switched to a smaller value, so that the maximum current of the infrared LED 21 can be kept low. Therefore, the power consumption of the mobile phone 100 can be reduced.

  Further, when the voltage of the power supply unit 22 is low, the current of the infrared LED 21 is switched to a larger value, so that sufficient light emission intensity of the infrared LED 21 can be secured, and a desired remote control operation can be performed stably and stably.

[Second Embodiment]
FIG. 4 is a circuit diagram showing a configuration of an infrared remote control unit (infrared remote control device) 200 provided in the mobile phone (mobile terminal device, mobile communication terminal device: overall illustration not shown) according to the second embodiment.

  As shown in FIG. 4, the infrared remote control unit 200 in the case of the present embodiment is for on / off switching comprising a FET (field effect transistor) instead of the bipolar on / off switching transistor TR <b> 1 (FIG. 1). It differs from the infrared remote control unit 30 (FIG. 1) in the case of the first embodiment only in that it includes a transistor (on / off switching switch) TR201, and otherwise in the first embodiment. In this case, the configuration is the same as that of the infrared remote control unit 30.

  Therefore, among the components of the infrared remote control unit 200 in the present embodiment, the same components as those in the infrared remote control unit 30 in the first embodiment are denoted by the same reference numerals. The description is omitted.

  In the present embodiment, among the terminals of the on / off switching transistor TR201, the gate terminal is connected to the control unit 20, the drain terminal is connected to the cathode terminal of the infrared LED 21, and the source terminal is connected to the ground.

  The on / off switching transistor TR201 is on / off controlled by the control unit 20 and switches the infrared LED 21 on / off in the same manner as the on / off switching transistor TR1 in the first embodiment.

  In the present embodiment, the other configurations of the mobile phone are the same as those in the first embodiment.

  According to the second embodiment, the same effect as in the first embodiment can be obtained.

[Third Embodiment]
FIG. 5 is a circuit diagram showing a configuration of an infrared remote control unit 300 included in a mobile phone (mobile terminal device, mobile communication terminal device: overall illustration not shown) according to the third embodiment.

  As shown in FIG. 5, the infrared remote control unit 300 in the present embodiment includes a P-channel type on / off switching transistor (on-state) instead of the N-channel type on / off switching transistor TR1 (FIG. 1). / Off switch, bipolar transistor) Only in that it includes a TR 301, it differs from the infrared remote control unit 30 (FIG. 1) in the case of the first embodiment, and otherwise the first embodiment described above. In this case, the configuration is the same as that of the infrared remote control unit 30.

  Therefore, among the components of the infrared remote control unit 300 in the present embodiment, the same components as those in the infrared remote control unit 30 in the first embodiment are denoted by the same reference numerals. The description is omitted.

  In the present embodiment, the on / off switching transistor TR301 is connected between the power supply unit 22 and the first resistor R1.

  That is, among the terminals of the on / off switching transistor TR301, the collector terminal is connected to the power supply unit 22, the emitter terminal is connected to one terminal of the first resistor R1, and the base terminal is connected to the control unit 20. .

  The cathode terminal of the infrared LED 21 is connected to the ground.

  In the case of this embodiment, the on / off switching transistor TR301 is on / off controlled by the control unit 20 in the same manner as the on / off switching transistor TR1 in the first embodiment, and the infrared LED 21 is turned on / off. Switch.

  In the present embodiment, the other configurations of the mobile phone are the same as those in the first embodiment.

  According to the third embodiment, the same effect as in the first embodiment can be obtained.

[Fourth Embodiment]
FIG. 6 is a circuit diagram showing a configuration of an infrared remote control unit 400 provided in a mobile phone (mobile terminal device, mobile communication terminal device: overall illustration not shown) according to the fourth embodiment.

  As shown in FIG. 6, the infrared remote control unit 400 in this embodiment has a resistance value switching switch (intensity) composed of an FET (field effect transistor) instead of the resistance value switching analog switch ASW1 (FIG. 1). It differs from the infrared remote control unit 30 (FIG. 1) in the case of the first embodiment only in that the setting switch (401) is provided, and the infrared remote in the case of the first embodiment is otherwise different. The configuration is the same as that of the control unit 30.

  Therefore, among the components of the infrared remote control unit 400 in this embodiment, the same components as those in the infrared remote control unit 30 in the first embodiment are denoted by the same reference numerals. The description is omitted.

  In the case of this embodiment, among the terminals of the resistance value switching switch 401, the gate terminal is the control unit 20, the drain terminal is the connection point between the first resistor R1 and the second resistor R2, and the source terminal is the first terminal. 2 is connected to a connection point between the resistor R2 and the anode terminal of the infrared LED 21.

  The resistance value switching switch 401 is ON / OFF controlled by the control unit 20 and switches the emission intensity of the infrared LED 21, similarly to the resistance value switching analog switch ASW 1 in the first embodiment.

  In the present embodiment, the other configurations of the mobile phone are the same as those in the first embodiment.

  According to the fourth embodiment, the same effect as in the first embodiment can be obtained.

[Fifth Embodiment]
In the first embodiment, the example in which the emission intensity of the infrared LED 21 is set to any one of the two levels has been described. However, in the fifth embodiment, the emission intensity of the infrared LED 21 is set to 3. An example in which any one of the step strengths can be set will be described.

  FIG. 7 is a circuit diagram showing a configuration of an infrared remote control unit (infrared remote control device) 500 provided in a mobile phone (mobile terminal device, mobile communication terminal device: overall illustration not shown) according to the fifth embodiment.

  As shown in FIG. 7, the infrared remote control unit 500 in the case of the present embodiment includes the second resistance value switching analog switch ASW2 and the third resistor R3 only in the first implementation described above. The infrared remote control unit 30 is different from the infrared remote control unit 30 (FIG. 1) in the embodiment, and is otherwise configured in the same manner as the infrared remote control unit 30 in the first embodiment.

  Therefore, among the components of the infrared remote control unit 500 in the present embodiment, the same components as those in the infrared remote control unit 30 in the first embodiment are denoted by the same reference numerals. The description is omitted.

  In the case of the present embodiment, of the two terminals of the second resistor R2, the terminal opposite to the one connected to the first resistor R1 is not connected to the anode terminal of the infrared LED 21, 3 is connected to one terminal of the resistor R3.

  The other terminal of the third resistor R3 is connected to the anode terminal of the infrared LED 21.

  In the present embodiment, the control terminal of the resistance value switching analog switch ASW1 is connected to the control unit 20, and one of the other two terminals of the resistance value switching analog switch ASW1 is the first resistor. The point connected to the connection point between R1 and the second resistor R2 is the same as in the first embodiment, but the remaining one terminal of the analog switch ASW1 for switching resistance is It is connected to the connection point between the third resistor R3 and the anode terminal of the infrared LED 21.

  In the case of the present embodiment, the control terminal of the second resistance value switching analog switch ASW2 is connected to the control unit 20, and among the other two terminals of the second resistance value switching analog switch ASW2, One terminal is connected to a connection point between the second resistor R2 and the third resistor R3, and the other terminal is connected to a connection point between the third resistor R3 and the anode terminal of the infrared LED 21. Has been.

  In the case of the present embodiment, the control unit 20 detects the detection result by the voltage detection unit 23 (voltage value of the power supply unit 22) and the first and second reference values set in advance (first reference value> first). 2), and the resistance value switching analog switch ASW1 and the second resistance value switching analog switch ASW2 are individually turned on or off according to the comparison result.

  That is, when the detection result by the voltage detection unit 23 is higher than the first reference value set in advance, the control unit 20 uses the resistance value switching analog switch ASW1 and the second resistance value switching. Each analog switch ASW2 is turned off.

  Further, the detection result by the voltage detection unit 23 is not higher than the preset first reference value (below the preset first reference value), and the preset second reference value. When the voltage is higher than that, the resistance value switching analog switch ASW1 is turned off, while the second resistance value switching analog switch ASW2 is turned on.

  Further, when the detection result by the voltage detector 23 is not higher than the preset second reference value (when the voltage is equal to or lower than the preset second reference value), the resistance value switching analog switch While the ASW1 is turned on, the second resistance value switching analog switch ASW2 is turned off.

  When the resistance value switching analog switch ASW1 and the second resistance value switching analog switch ASW2 are turned off, the supply current from the power source 22 to the infrared LED 21 is the first, second and third resistances R1, Limited by R2 and R3. Therefore, the current of the infrared LED 21 is the smallest, and the emission intensity of the infrared LED 21 is the weakest.

  Further, when the resistance value switching analog switch ASW1 is off and the second resistance value switching analog switch ASW2 is on, the terminals of the third resistor R3 are connected to each other. The supply current to the infrared LED 21 is limited by the first and second resistors R1, R2 among the first, second, and third resistors R1, R2, and R3. Therefore, the current of the infrared LED 21 is medium, and the emission intensity of the infrared LED 21 is also medium.

  When the resistance value switching analog switch ASW1 is on and the second resistance value switching analog switch ASW2 is off, the connection point between the first resistor R1 and the second resistor R2 and the third resistor Since the connection point between R3 and the cathode terminal of the infrared LED 21 is connected to each other, the supply current from the power supply unit 22 to the infrared LED 21 is only the first resistor R1 of the first and second resistors R1 and R2. Limited by. Therefore, the current of the infrared LED 21 is the largest, and the emission intensity of the infrared LED 21 is the strongest.

  Thus, in the case of the present embodiment, the control unit 20 sets the emission intensity of the infrared LED 21 to any one of the three levels.

  In the present embodiment, the other configurations of the mobile phone are the same as those in the first embodiment.

  Next, the operation will be described.

  FIG. 8 is a diagram illustrating a voltage-current characteristic representing the relationship between the voltage of the power supply unit 22 and the current flowing through the infrared LED 21.

  When the on / off switching transistor TR1 is in the on state and the resistance value switching analog switch ASW1 and the second resistance value switching analog switch ASW2 are in the off state, the infrared LED 21 is supplied from the power supply unit 22 Light is emitted at a current limited by the first, second, and third resistors R1, R2, and R3. The voltage-current characteristic at this time is as indicated by AH in FIG. 8 (a straight line connecting point A and point H).

  Further, when the on / off switching transistor TR1 is on, the resistance value switching analog switch ASW1 is off, and the second resistance value switching analog switch ASW2 is on, the infrared LED 21 is connected to the power supply unit 22. , And emits light with a current limited by the first and second resistors R1 and R2. The voltage-current characteristic at this time is as indicated by AB in FIG. 8 (a straight line connecting point A and point B).

  When the on / off switching transistor TR1 is on, the resistance value switching analog switch ASW1 is on, and the second resistance value switching analog switch ASW2 is off, the infrared LED 21 is connected to the power supply unit 22. To emit light with a current limited by the first resistor R1. The voltage-current characteristics at this time are as indicated by AC in FIG. 8 (a straight line connecting point A and point C).

  When the on / off switching transistor TR1 is in the off state, the infrared LED 21 does not emit light.

  FIG. 9 is a diagram illustrating the light emission control characteristics of the infrared LED 21 according to the voltage of the power supply unit 22.

  As shown in FIG. 9, when the voltage of the power supply unit 22 is higher than the first reference value I (between H and J in FIG. 9), the control unit 20 uses the resistance value switching analog switch ASW1 and the second reference value I. Each of the resistance value switching analog switches ASW2 is turned off. In this case, when the light emission of the infrared light emitting LED 21 for remote control occurs, the control unit 20 causes the infrared LED 21 to emit light with a desired light emission pattern with the weakest light emission intensity. That is, in this case, since the current flowing through the infrared LED 21 is limited by the first, second, and third resistors R1, R2, and R3, the power consumption of the infrared LED 21 is most suppressed.

  Further, the voltage of the power supply unit 22 is not higher than the first reference value I (below the first reference value I) and the second reference value G (second reference value G <first reference value I) If it is higher (between KD in FIG. 9), the control unit 20 turns off the resistance value switching analog switch ASW1 and turns on the second resistance value switching analog switch ASW2. In this case, when the light emission of the infrared light emitting LED 21 for remote control occurs, the control unit 20 causes the infrared LED 21 to emit light with a desired light emission pattern with a medium light emission intensity. That is, in this case, since the current flowing through the infrared LED 21 is limited by the first and second resistors R1 and R2, the current flowing through the infrared LED 21 even if the voltage of the power supply unit 22 is lower than between HJ in FIG. The value becomes a sufficient value, and sufficient emission intensity of the infrared LED 21 can be secured. Further, the power consumption of the infrared LED 21 is suppressed as compared with the case where the voltage of the power supply unit 22 is between EF in FIG. 9.

  In addition, when the voltage of the power supply unit 22 is not higher than the second reference value G (in the case of the second reference value G or less) (between EF in FIG. 9), the control unit 20 switches the resistance value. The analog switch ASW1 is turned on, and the second resistance value switching analog switch ASW2 is turned off. In this case, when the light emission of the infrared light emitting LED 21 for remote control occurs, the control unit causes the infrared LED 21 to emit light with a desired light emission pattern with the strongest light emission intensity. That is, in this case, the current flowing through the infrared LED 21 is limited only by the first resistor R1 among the first, second and third resistors R1, R2, and R3, so that the voltage of the power supply unit 22 is K in FIG. Even if it is lower than between -D, the value of the current flowing through the infrared LED 21 becomes a sufficient value, and sufficient emission intensity of the infrared LED 21 can be secured.

  According to the fifth embodiment as described above, the same effect as in the first embodiment can be obtained.

  Moreover, since the light emission intensity of the infrared LED 21 is set to any one of the three levels, the power consumption of the mobile phone 100 can be more suitably reduced.

  In the fifth embodiment, the example in which the emission intensity of the infrared LED 21 can be set to any one of the three levels is described. However, the present invention is not limited to this example, and the infrared LED 21 is not limited to this example. The infrared remote control unit may be configured such that the emission intensity of the light can be set to any one of four or more levels. That is, in the fifth embodiment, there has been described an example in which there are three resistors that limit the current supplied to the infrared LED 21 and two analog switches that switch the emission intensity of the infrared LED 21. The number of switchable emission intensity levels can be increased by appropriately increasing the number.

[Sixth Embodiment]
FIG. 10 is a circuit diagram showing a configuration of an infrared remote control unit 600 included in a mobile phone (mobile terminal device, mobile communication terminal device: overall illustration not shown) according to the sixth embodiment.

  As shown in FIG. 10, the infrared remote control unit 600 in the case of this embodiment includes an operation unit (operation unit) 11 (FIG. 1) instead of the voltage detection unit 23 (FIG. 1). Has been.

  The infrared remote control unit 600 in the case of the present embodiment is otherwise configured in the same manner as the infrared remote control unit 30 in the case of the first embodiment. Among the components of the remote control unit 600, the same components as those in the infrared remote control unit 30 in the case of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the case of the present embodiment, the control unit 20 changes the emission intensity of the infrared LED 21 by turning on or off the resistance value switching analog switch ASW1 in accordance with an operation on the operation unit 11.

  That is, when the operation unit 11 receives an operation requesting an increase in infrared light emission intensity, the control unit 20 turns on the resistance value switching analog switch ASW1 and changes the light emission intensity of the infrared LED 21.

  For example, when a predetermined time (for example, 15 seconds) elapses after the operation unit 11 receives an operation requesting an increase in infrared light emission intensity, the control unit 20 performs an analog switch for resistance value switching. Turn off ASW1 again.

  Also in the present embodiment, the other configurations of the mobile phone are the same as those in the first embodiment.

  Next, the operation will be described.

  FIG. 11 is a diagram showing the light emission control characteristics of the infrared LED 21 in the present embodiment.

  In a normal setting, the resistance value switching analog switch ASW1 is OFF, and the voltage-current characteristic is DB in FIG. 11 (a straight line connecting the point D and the point B).

  When the remote control function does not operate because the distance to the irradiated device is long with this setting, the user of the mobile phone performs an operation for requesting an increase in infrared light emission intensity on the operation unit 11.

  Then, the control unit 20 detects this operation, turns on the resistance value switching analog switch ASW1, and temporarily (for example, only for 15 seconds) from the point L to the point M in FIG. The current can be increased.

  Thereby, the light emission intensity of the infrared LED 21 is also increased, and the remote control operation can be performed reliably and stably.

  According to the sixth embodiment as described above, since the current of the infrared LED 21 is switched to a larger value in accordance with the user's operation, the sufficient emission intensity of the infrared LED 21 can be ensured as necessary, and the desired Remote control operation can be performed reliably and stably.

  In each of the above embodiments, a mobile phone is exemplified as a mobile terminal device including an infrared remote control unit (infrared remote control device). However, the present invention is not limited to this example, and for example, mobile communication other than a mobile phone. The present invention can be similarly applied to a terminal device (for example, PHS (Personal Handy Phone System)) or a portable information terminal device (having an information processing function) such as a PDA (Personal Digital Assistant) or a notebook personal computer. Is possible.

  Further, as described in the second embodiment, an on / off switching transistor (on / off switching switch) including a FET (field effect transistor) instead of the bipolar on / off switching transistor TR1. The configuration including the TR 201 (FIG. 4) can be similarly applied to the fourth embodiment (FIG. 6), the fifth embodiment (FIG. 7), and the sixth embodiment (FIG. 10).

  Further, as described in the third embodiment, a P-channel on / off switching transistor (on / off switching switch, bipolar transistor) is used instead of the N-channel on / off switching transistor TR1. The configuration including the TR 301 (FIG. 5) can be similarly applied to the fourth embodiment (FIG. 6), the fifth embodiment (FIG. 7), and the sixth embodiment (FIG. 10).

  Further, as described in the fourth embodiment, instead of the resistance value switching analog switch ASW1, a resistance value switching switch (strength setting switch) 401 including a FET (field effect transistor) 401 (FIG. 6). The configuration including the above can be similarly applied to the second embodiment (FIG. 4), the third embodiment (FIG. 5), and the sixth embodiment (FIG. 10). Similarly, in the case of the fifth embodiment (FIG. 7), one or both of the resistance value switching analog switch ASW1 and the second resistance value switching analog switch ASW2 is used as a resistance value switching switch formed of an FET. Can be replaced.

  In addition, as described in the fifth embodiment, the configuration in which the emission intensity of the infrared LED 21 can be set to any one of three or more levels of intensity is the second configuration described above. The present embodiment (FIG. 4), the third embodiment (FIG. 5), the fourth embodiment (FIG. 6), and the sixth embodiment (FIG. 10) can be similarly applied.

  Further, as described in the sixth embodiment, the configuration in which the resistance value switching analog switch ASW1 is turned on or off according to the operation on the operation unit 11 is the same as that in the second embodiment (FIG. 4), The present invention can be similarly applied to the third embodiment (FIG. 5) and the fourth embodiment (FIG. 6). Similarly, in the case of the fifth embodiment (FIG. 7), the resistance value switching analog switch ASW1 and the second resistance value switching analog switch ASW2 are individually turned on or off in accordance with an operation on the operation unit 11. can do.

1 is a block diagram illustrating a configuration of a mobile phone according to a first embodiment. It is a figure which shows the relationship between the voltage of the power supply part in the mobile telephone of FIG. 1, and the electric current which flows into infrared LED. It is a figure which shows the light emission control characteristic of infrared LED according to the voltage of the power supply part in the mobile telephone of FIG. It is a circuit diagram which shows the structure of the infrared remote control part with which the mobile telephone which concerns on 2nd Embodiment is provided. It is a circuit diagram which shows the structure of the infrared remote control part with which the mobile telephone which concerns on 3rd Embodiment is provided. It is a circuit diagram which shows the structure of the infrared remote control part with which the mobile telephone which concerns on 4th Embodiment is provided. It is a circuit diagram which shows the structure of the infrared remote control part with which the mobile telephone which concerns on 5th Embodiment is provided. It is a figure which shows the relationship between the voltage of the power supply part in the infrared remote control part of FIG. 7, and the electric current which flows into infrared LED. It is a figure which shows the light emission control characteristic of infrared LED according to the voltage of the power supply part in the infrared remote control part of FIG. It is a circuit diagram which shows the structure of the infrared remote control part with which the mobile telephone which concerns on 6th Embodiment is provided. It is a figure which shows the light emission control characteristic of the infrared LED in the infrared remote control part of FIG. It is a circuit diagram which shows the structure of the infrared remote control part with which the conventional mobile telephone is provided. It is a figure which shows the relationship between the voltage of the power supply part in the infrared remote control part of FIG. 12, and the electric current of an infrared light emitting diode.

Explanation of symbols

20 Control unit (light emission intensity changing means)
21 Infrared LED (Infrared LED)
30 Infrared remote control unit (Infrared remote control device)
ASW1 Resistance switch analog switch (strength setting switch, analog switch)
22 Power supply (power supply)
23 Voltage detector (voltage detection means)
R1 first resistance (resistance)
R2 Second resistance (resistance)
TR1 ON / OFF switching transistor (ON / OFF switching switch, bipolar transistor)
100 Mobile phone (mobile terminal device, mobile communication terminal device)
Operating means 200 Infrared remote control unit (infrared remote control device)
TR201 ON / OFF switching transistor (ON / OFF switching switch, field effect transistor)
300 Infrared remote control unit (infrared remote control device)
TR301 On / off switching transistor (on / off switching switch, bipolar transistor)
400 Infrared remote control unit (infrared remote control device)
401 Resistance value switch (strength setting switch, field effect transistor)
500 Infrared remote control unit (infrared remote control device)
R3 Third resistance (resistance)
ASW2 Second resistance value switching analog switch (strength setting switch, analog switch)
600 Infrared remote control unit (Infrared remote control device)
11 Operation part (operation means)

Claims (22)

In an infrared remote control device comprising an infrared light emitting diode and performing remote control by causing the infrared light emitting diode to emit light in a desired light emission pattern,
An infrared remote control device comprising emission intensity changing means for changing the emission intensity of the infrared light emitting diode. Voltage detecting means for detecting a voltage of a power source of the infrared light emitting diode;
2. The infrared remote control device according to claim 1, wherein the emission intensity changing unit changes the emission intensity of the infrared light emitting diode in accordance with a voltage value detected by the voltage detection unit.   When the voltage value detected by the voltage detection means is a relatively high voltage, the emission intensity changing means reduces the emission intensity of the infrared light emitting diode, while detecting the voltage detection means. 3. The infrared remote control device according to claim 2, wherein when the voltage value is relatively low, the emission intensity of the infrared light emitting diode is made relatively strong. It further comprises operating means operated by the user,
2. The infrared remote control device according to claim 1, wherein the light emission intensity changing unit changes a light emission intensity of the infrared light emitting diode in accordance with an operation on the operation unit.   The emission intensity changing means changes the emission intensity of the infrared light emitting diode by changing a resistance value that limits a current supplied from the power source of the infrared light emitting diode to the infrared light emitting diode. The infrared remote control device according to any one of claims 1 to 3.   Between the power source of the infrared light emitting diode and the infrared light emitting diode, a plurality of resistors connected in series are provided, and a resistance selected from these resistors is supplied from the power source to the infrared light emitting diode. 6. The infrared remote control device according to claim 5, wherein the infrared remote control device is used for current limitation.   The infrared emission according to any one of claims 1 to 6, wherein the emission intensity changing means sets the emission intensity of the infrared light emitting diode to one of two levels of intensity. Remote control device.   8. The infrared remote control device according to claim 7, wherein the light emission intensity changing means sets the light emission intensity of the infrared light emitting diode by one intensity setting switch.   9. The infrared remote control device according to claim 8, wherein the intensity setting switch is an analog switch.   9. The infrared remote control device according to claim 8, wherein the intensity setting switch is composed of a field effect transistor.   The said light emission intensity change means sets the light emission intensity of the said infrared light emitting diode to any one intensity | strength of the intensity | strength of three or more steps, The Claim 1 thru | or 5 characterized by the above-mentioned. Infrared remote control device.   The on / off switching of the infrared light emitting diode for causing the infrared light emitting diode to emit light with the desired light emission pattern is performed by one on / off switching switch. The infrared remote control device according to item.   13. The infrared remote control device according to claim 12, wherein the on / off switching switch comprises a bipolar transistor.   13. The infrared remote control device according to claim 12, wherein the on / off switching switch comprises a field effect transistor.   A portable terminal device comprising the infrared remote control device according to any one of claims 1 to 14.   The mobile terminal device according to claim 15, wherein the mobile terminal device is a mobile communication terminal device having a communication function.   The mobile terminal device according to claim 16, wherein the mobile terminal device is a mobile phone.   The portable terminal device according to claim 15 or 16, wherein the portable terminal device is a portable information terminal device having an information processing function. A method for controlling light emission of the infrared light emitting diode in an infrared remote control device comprising an infrared light emitting diode and performing remote control by causing the infrared light emitting diode to emit light in a desired light emission pattern,
An intensity changing process for changing the emission intensity of the infrared light emitting diode;
A process of causing the infrared light emitting diode to emit light in a desired light emission pattern at a light emission intensity after change due to the intensity change process;
A method for controlling light emission of an infrared light emitting diode. A method for controlling light emission of the infrared light emitting diode in an infrared remote control device comprising an infrared light emitting diode and performing remote control by causing the infrared light emitting diode to emit light in a desired light emission pattern,
A voltage detection process for detecting a power supply voltage of the infrared light emitting diode;
An intensity changing process for changing the emission intensity of the infrared light emitting diode according to the voltage value detected by the voltage detecting process;
A process of causing the infrared light emitting diode to emit light in a desired light emission pattern at a light emission intensity after change due to the intensity change process;
An infrared light emitting diode light emission control method comprising: A method for controlling light emission of the infrared light emitting diode in an infrared remote control device comprising an infrared light emitting diode and performing remote control by causing the infrared light emitting diode to emit light in a desired light emission pattern,
An operation detection process for detecting an operation by a user;
Intensity changing process for changing the emission intensity of the infrared light emitting diode according to the type of operation detected by the operation detecting process,
A process of causing the infrared light emitting diode to emit light in a desired light emission pattern at a light emission intensity after change due to the intensity change process;
An infrared light emitting diode light emission control method comprising: A program for causing a computer to execute the light emission control method for an infrared light emitting diode according to any one of claims 19 to 21.

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