JP2000316193A - Infrared remote control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an infrared remote control for suppressing heating due to short-circuit currents even when an electrolytic capacitor for stabilizing a power source is short-circuited in a simple constitution. SOLUTION: This infrared remote controller 10 is constituted of an inputting part 11, a control part 12 which generates a control signal based on an input signal from the inputting part, an infrared emitting part 13 which emits infrared rays based on the control signal from the control part, and a power source part 14 which supplies a driving voltage to the control part and the infrared emitting part. In this case, the power source part 14 is constituted of a power source battery 14a and an electrolytic capacitor 14b connected between a connection line between the power source battery and the control part and ground, and a current limiting resistor 15 is serially connected between the power source battery and the electrolytic capacitor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared remote control device used for performing various operations in, for example, a game computer or a personal computer or various home electric appliances, for example, various operations in a computer game.

[0002]

2. Description of the Related Art Conventionally, such an infrared remote controller is constructed as shown in FIG. 3, an infrared remote controller 1 includes an input unit 2 for performing various input operations, a control unit 3 for outputting a corresponding control signal based on an input signal from the input unit 2, and a control signal from the control unit 3. And a power supply unit 5 for supplying a drive voltage to the control unit 3 and the infrared light emitting unit 4.

The input unit 2 has a known configuration, and in the illustrated case, is constituted by a so-called key matrix 2a which is turned on and off by a number of keys. The control unit 3 has a well-known configuration.
And modulates a pulse signal from the oscillation circuit 3a based on an input signal from the key matrix 2a of the input section 2 to output a control signal corresponding to the input signal.

The infrared light emitting section 4 comprises an infrared LED 4a as an infrared light emitting element and a switching element 4b connected in series to the infrared LED 4a in the case shown in the figure. Here, the switching element 4b is composed of a transistor in the case shown in the figure, and a control signal from the control unit 3 is input to the base via the resistor 3b, so that the collector is only when the control signal is at the H level. -Conduction between emitters. Thus, only when the control signal of the control unit 3 is at the H level, the infrared L
When a drive voltage from the power supply unit 5 is applied to the ED 4a and a drive current flows, the infrared LED 4a emits infrared light.

The power supply unit 5 includes a power supply battery 5a, an electrolytic capacitor 5b connected in parallel to the power supply battery 5a,
It is composed of The electrolytic capacitor 5b is configured to be stabilized by the power supply voltage applied to the control unit 3 by being charged by the power supply battery 5a.

The key matrix 2a of the input unit 2
Is composed of, for example, a carbon pattern formed by printing on a circuit board, and the control unit 3, the oscillation circuit 3a, the resistor 3b, the infrared light emitting unit 4, and the electrolytic capacitor 5b are respectively mounted on the circuit board. It is constituted by.

According to the infrared remote controller 1 having such a configuration, the driving voltage is applied from the power supply battery 5a to the control section 3 and the infrared light emitting section 4, and the control section 3 and the infrared light emitting section 4 operate. Here, the user operates the key matrix 2 of the input unit 2.
By pressing the desired key of a, the contact below the key of the key matrix becomes conductive, and an input signal corresponding to the key is input to the control unit 3. Thereby, the control unit 3 sends the control signal corresponding to the input signal to the resistor 3
Since the signal is output to the base of the switching element 4b via the switch b, the switching element 4b of the infrared light emitting section 4 conducts during the H level of the control signal, and the drive current flows through the infrared LED 4a. Infrared LED
An infrared light signal corresponding to the control signal is emitted from 4a.
Then, the infrared light signal is transmitted to the infrared remote control device 1.
Incident on the infrared receiver of various devices to be operated,
By restoring the control signal, desired operations of various devices can be performed.

[0008]

By the way, in the infrared remote controller 1 having such a configuration, if the terminals of the electrolytic capacitor 5b are short-circuited for some reason,
A short-circuit current flows through the electrolytic capacitor 5b. If left in this short-circuit state, the power supply battery 5a is consumed by the short-circuit current and heat is generated by the short-circuit current, and in some cases, the circuit board or the case of the infrared remote controller 1 is deformed. Or destroyed.

In view of the above, the present invention provides an infrared remote control device having a simple structure and capable of suppressing heat generation due to a short-circuit current even when an electrolytic capacitor for stabilizing a power supply is short-circuited. It is an object.

[0010]

An object of the present invention is to provide an input unit,
A control unit that generates a control signal based on an input signal from the input unit, an infrared light emitting unit that emits infrared light based on a control signal from the control unit, and a driving voltage to the control unit and the infrared light emitting unit An infrared remote control device, comprising: a power supply battery; and an electrolytic capacitor connected between a connection line between the power supply battery and the control unit and the ground. In the infrared remote control device, a current limiting resistor is connected in series between the power supply battery and the electrolytic capacitor.

In the remote controller according to the present invention, preferably, the current limiting resistor is a carbon printed resistor printed on a circuit board.

In the remote controller according to the present invention, preferably, the current limiting resistor is a resistance element mounted on a circuit board.

According to the above configuration, when the user operates the input key of the input unit, an input signal corresponding to the operation is output from the input unit to the control unit. Thereby, the control unit:
A control signal corresponding to the input signal is output to the infrared light emitting unit, and the infrared light emitting unit emits an infrared light signal corresponding to the control signal. Then, when the infrared light signal is incident on an infrared light receiving section of various devices to be operated by a remote controller, a desired operation is performed on the various devices.

In this case, even if the electrolytic capacitor is short-circuited for some reason and a short-circuit current flows from the power supply unit to the electrolytic capacitor, the short-circuit current flows through the current limiting resistor, so that an excessive current Does not. Therefore, even if such a short-circuit state of the electrolytic capacitor is left, the battery consumption of the power supply unit due to the short-circuit current is relatively small, and the heat generation due to the short-circuit current is relatively small. The case does not deform or break.

In the case where the current limiting resistor is a carbon printed resistor printed on a circuit board, for example, if the input section is composed of a key matrix printed on the circuit board, the current limiting resistor is also It can be printed at the same time as this key matrix, without increasing the process,
At low cost, a current limiting resistor could be provided.

In the case where the current limiting resistor is a resistance element mounted on a circuit board, for example, if the control unit is constituted by a remote control IC mounted on the circuit board,
The current limiting resistor can be mounted on the circuit board at the same time as the remote control IC and the like, and the current limiting resistor can be provided at low cost without increasing the number of steps.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 shows an embodiment of an infrared remote controller according to the present invention. FIG.
In the infrared remote control device 10, an input unit 11 for performing various input operations, a control unit 12 for outputting a corresponding control signal based on an input signal from the input unit 11, and a control signal from the control unit 12 And a power supply unit 14 for supplying a drive voltage to the control unit 12 and the infrared light emitting unit 13.

The input unit 11 has a known configuration.
In the case shown in the figure, it is composed of a so-called key matrix 11a which is turned on / off by a number of keys. The control unit 12 has a well-known configuration, and is composed of a remote control IC in the illustrated case.
The control signal corresponding to the input signal is output by modulating the pulse signal from the oscillation circuit 12a on the basis of the input signal from the input device.

In the illustrated case, the infrared light emitting section 13 includes an infrared LED 13a as an infrared light emitting element and an infrared LED 13a.
a switching element 13b connected in series to
And is composed of Here, switching element 1
3b is composed of a transistor in the case shown in the figure, and when a control signal from the control unit 12 is input to the base via the resistor 12b, the collector-emitter connection is made only when the control signal is at the H level. It is supposed to. As a result, only when the control signal of the control unit 12 is at the H level, the driving voltage from the power supply unit 14 is applied to the infrared LED 13a and the driving current flows.
The ED 13a emits infrared light.

The power supply section 14 includes a power supply battery 14a and an electrolytic capacitor 1 connected in parallel to the power supply battery 14a.
4b. This electrolytic capacitor 14
b is configured to be stabilized by the power supply voltage applied to the control unit 12 by being charged by the power supply battery 14a.

The key matrix 1 of the input unit 11
1a is formed of, for example, a carbon pattern formed by printing on a circuit board (not shown), and the control unit 12, the oscillation circuit 12a, the resistor 12b, the infrared light emitting unit 13, and the electrolytic capacitor 14b are each a circuit. It is configured by being mounted on a substrate.

The above configuration is almost the same as that of the conventional infrared remote controller 1 shown in FIG. 3, but the infrared remote controller 10 according to the present invention has a power supply battery 14a.
The difference is that a current limiting resistor 15 is connected in series between the capacitor and the electrolytic capacitor 14b. The current limiting resistor 15 is configured as a carbon printed resistor formed by printing on the circuit board, but is not limited thereto, and may be configured as a resistance element mounted on the circuit board.

The infrared remote controller 10 according to the embodiment of the present invention is configured as described above, and includes the power supply battery 14a.
From the controller 12 via the current limiting resistor 15
And directly to the infrared light emitting unit 13, respectively.
The control unit 12 and the infrared light emitting unit 13 operate. Here, when the user presses a desired key of the key matrix 11a of the input unit 11, the key matrix 11a
The contact below the key is turned on, and an input signal corresponding to the key is input to the control unit 12. Thereby, the control unit 12 modulates the pulse signal from the oscillation circuit 12a with this input signal to generate a corresponding control signal, and outputs this control signal to the base of the switching element 13b via the resistor 12b. I do. Thereby, the infrared light emitting unit 13
Is turned on only during the H level of the control signal, and a drive current flows through the infrared LED 13a. Thus, an infrared light signal corresponding to the control signal is emitted from the infrared LED 13a. Then, the infrared light signal enters the infrared receiving sections of various devices to be operated by the infrared remote control device 10, and the control signals are restored, whereby desired operations of the various devices can be performed. .

If the terminals of the electrolytic capacitor 14b are short-circuited for some reason, the electrolytic capacitor 1b
A short-circuit current flows through 4b. However, since the current limiting resistor 15 is connected in series between the power supply battery 14a and the electrolytic capacitor 14b, the short-circuit current is limited by the current limiting resistor 15, and does not become an excessive current. The current value becomes relatively small. Therefore, even if the power supply battery 14a is left in this short-circuit state, the short-circuit current does not cause the power supply battery 14a to be consumed, and the short-circuit current generates relatively little heat. Accordingly, the circuit board and the case of the infrared remote controller 10 are not deformed or broken. Here, the current limiting resistor 15 can be formed on the circuit board by printing at the same time as the key matrix 11a of the input section 11, and can be configured at low cost without increasing the number of steps. On the other hand, when the current limiting resistor 15 is a resistive element mounted on a circuit board, the remote control IC and the oscillation circuit 12a of the control unit 12, the resistor 12b, and the infrared LED 13a of the infrared light emitting unit 13 are used. , The switching element 13b, and the electrolytic capacitor 14b, at the same time, can be mounted on the circuit board.
It can be configured at low cost.

In the above-described embodiment, the current limiting resistor 15 is connected in series on the connection line between the power supply battery 14a and the control unit 12. However, the present invention is not limited to this, and as shown in FIG. Obviously, it may be connected in series between the capacitor 14b and ground. Also,
In the above-described embodiment, a transistor is used as the switching element 13b of the infrared light emitting unit 13. However, the present invention is not limited to this, and other switching elements or other electronic components having a switching function may be used. it is obvious. Further, in the above-described embodiment, the input unit 11 is configured by the key matrix 11a, but is not limited to this, and it is apparent that other input means may be provided.

[0026]

As described above, according to the present invention, when the user operates the input key of the input unit, an input signal corresponding to the operation is output from the input unit to the control unit. Accordingly, the control unit outputs a control signal corresponding to the input signal to the infrared light emitting unit, and the infrared light emitting unit emits an infrared light signal corresponding to the control signal. Then, when the infrared light signal is incident on an infrared light receiving section of various devices to be operated by a remote controller, a desired operation is performed on the various devices.

In this case, even if the electrolytic capacitor is short-circuited for some reason and a short-circuit current flows from the power supply unit to the electrolytic capacitor, the short-circuit current flows through the current limiting resistor, so that an excessive current Does not. Therefore, even if such a short-circuit state of the electrolytic capacitor is left, the battery consumption of the power supply unit due to the short-circuit current is relatively small, and the heat generation due to the short-circuit current is relatively small. The case does not deform or break.

Thus, according to the present invention, there is provided an extremely excellent infrared remote control device having a simple structure and capable of suppressing heat generation due to a short-circuit current even if an electrolytic capacitor for stabilizing a power supply is short-circuited. You will get.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing an embodiment of an infrared remote controller according to the present invention.

FIG. 2 is a block circuit diagram showing another embodiment of the infrared remote controller according to the present invention.

FIG. 3 is a block circuit diagram showing an example of a conventional infrared remote controller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Infrared remote control device 11 Input part 11a Key matrix 12 Control part 12a Oscillation circuit 12b Resistance 13 Infrared light emitting part 13a Infrared LED 13b Switching element 14 Power supply part 14a Power battery 14b Electrolytic capacitor 15 Current limiting resistance

Claims (3)

[Claims] An input unit, a control unit that generates a control signal based on an input signal from the input unit, an infrared light emitting unit that emits infrared light based on a control signal from the control unit, a control unit, and an infrared light A power supply unit for supplying a drive voltage to the light-emitting unit, wherein the power supply unit is a power supply battery, an electrolytic capacitor connected between a connection line between the power supply battery and the control unit, and ground, An infrared remote control device, comprising: a current limiting resistor connected in series between the power supply battery and the electrolytic capacitor. 2. The infrared remote controller according to claim 1, wherein the current limiting resistor is a carbon printed resistor printed on a circuit board. 3. The infrared remote control device according to claim 1, wherein said current limiting resistor is a resistance element mounted on a circuit board.