JPH06153281A - Remote control transmitter - Google Patents

Abstract

PURPOSE:To prevent consumption of a dry battery even when a thing is left placed on the remote control transmitter by suppressing a current supplied to an infrared ray LED outputting a transmission code when an operation key is kept depressed for a prescribed time. CONSTITUTION:The transmitter is provided with an operation key change detection section 5 detecting a change in an operation key and outputting a reset signal 30 to a counter 7 and a comparator 8 comparing a content of a register 6 and a count of the counter 7, and a transmission code output control section 9 controlling the changeover of permission and inhibition of an output of a transmission code depending on the result of comparison. When the operation key is kept depressed for a prescribed time, since the comparator 8 sends a command of a coincidence signal 31 to the transmission code output control section 9, a remote control output waveform is inhibited and current consumption is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control transmitter,
In particular, the present invention relates to a small remote controller transmitter that requires power saving.

[0002]

2. Description of the Related Art The configuration of a conventional general remote control transmitter will be described with reference to FIG. In FIG. 4, when the operation key reading unit 1 confirms the key input, the operation key type determination unit 2 determines the operation key type and determines whether the key input is valid or invalid. When the operation key type determination unit 2 determines that the key is valid, the remote control output waveform generation unit 3 creates an output waveform of the transmission code and outputs it from the infrared LED 4.

Therefore, the conventional remote control transmitter outputs a transmission code when a valid key input is confirmed. If the operation key is held down, the transmission code is continuously output.

It should be noted that the operation key reading section 1, the operation key type discriminating section 2, and the remote control output waveform creating section 3 are usually constructed by a microcomputer in one chip.

As a measure against the conventional power saving,
If all the operation keys were not pressed, a configuration was adopted in which the microcomputer was put into a standby mode to reduce current consumption.

[0006]

In the above-mentioned conventional remote control transmitter, there is adopted a power-saving measure in which the microcomputer is put in the standby mode unless all the operation keys are pressed. Even if a key is pressed, it will exit standby mode. Therefore, if an object is left on the remote control transmitter, it will be released from the standby mode and the transmission code will continue to be output.
D is turned on and a current of several tens mA is constantly consumed. Usually, there is a problem that a large current is consumed in a remote control transmitter in which a small dry battery is used, and the dry battery becomes empty before the remote controller is used too much.

[0007]

The configuration of the remote control transmitter of the present invention is, in addition to means for outputting a transmission code by inputting an operation key, a counter operating during transmission of a remote control signal and a value of the counter separately. A comparator for comparing the set time, means for detecting a change in the transmission code, means for outputting a reset signal for resetting the counter when the change in the transmission code is detected by the means, the comparison It is characterized by further comprising means for controlling switching between permission and prohibition of output of the transmission code according to the comparison result of the containers.

[0008]

1 is a block diagram showing a remote control transmitter according to a first embodiment of the present invention.

In FIG. 1, the present embodiment has the same circuit as that of FIG.
A comparator 8 and a transmission code output control unit 9 are added.

In FIG. 1, in the present embodiment, the operation key reading unit 1 determines whether or not there is a key input, and the operation key type determination unit 2 determines the operation key type and whether the key input is valid or invalid. To do. Remote control output waveform creation unit 3
Creates the output waveform of the transmission code. The operation key change detection unit 5 is a unit that detects a change in the transmission code, and is a unit that outputs a reset signal 30 that resets the counter 7 when the change in the transmission code is detected. The reset signal 30 to the counter 7.
Is output. The comparator 8 compares the value set in the register 6 with the value of the counter 7. Transmission code output control unit 9
Controls the permission and prohibition of the output of the transmission code according to the comparison result of the comparator 8. The infrared LED 4 actually outputs the transmission code created by the remote control output waveform creation unit 3.

Next, the operation of this embodiment will be described. Based on the result determined by the operation key type determination unit 2, the operation key change detection unit 5 detects a change in the operation key. If there is a change, the reset signal 30 is output and the counter 7 is cleared. That is, when the operation key is normally pressed, the counter 7 is cleared, so that the transmission code output control unit 9 always permits the transmission code to be output and outputs the transmission code from the infrared LED 4.

If the operation key is kept pressed, the counter 7 continues to count, and when the counter value reaches the value set in the register 6, the comparator 8 sends a command of the coincidence signal 31 to the transmission code output control section 9. , Stop sending code output.

Therefore, if the same key is kept pressed for a long time and a certain fixed time elapses, the transmission of the remote control waveform is prohibited, so that the current consumption can be reduced.

FIG. 3 is a flow chart showing an example of using the standby mode of the microcomputer as a means for controlling the inhibition of the output of the transmission code in the embodiment of FIG. In FIG. 3, a comparison process 41 of the previous operation key and the current operation key, a comparison process 42 of a transmission time measuring timer and a set value set under a separately determined condition, a standby mode 43, and a standby mode Release determination processing 44,
Clearing 45 of the transmission time measuring timer is shown.

In step 41, the previous operation key and the current operation key are compared. If they do not match, the transmission time measuring timer is cleared in step 45. If they match, the setting value separately set with the transmission time measuring timer in step 42. When it is confirmed that they match with each other, the standby mode 43 is entered. In process 44, the standby mode is continued until the standby mode release condition is satisfied. The condition for establishing the standby mode is that all the operation keys are released.

FIG. 2 is a block diagram showing a remote control transmitter according to the second embodiment of the present invention. 2, the present embodiment has a configuration in which a transmission code output control unit 9, a waveform data reading unit 10, a register 6, a counter 7, a comparator 8, and a waveform data change detection unit 11 are added to the circuit of FIG. Circuit.

In FIG. 2, the waveform data reading unit 10
Then, the waveform data of the transmission code is read, and the change detector 11 detects the change in the waveform data. If there is a change, a reset signal 50 is output from the waveform data change detection unit 11 to the counter 7. After that, the operation is similar to that of the first embodiment.

[0018]

As is apparent from the above description, according to the remote control transmitter of the present invention, the output of the transmission code is stopped when the same operation key is continuously pressed, so that the infrared ray L
There is an effect that the current for lighting the ED can be limited,
It also has the effect of preventing the dry battery from becoming empty even if an object is left on the remote control transmitter.

[Brief description of drawings]

FIG. 1 is a block diagram showing a remote control transmitter according to a first exemplary embodiment of the present invention.

FIG. 2 is a block diagram showing a remote control transmitter according to a second exemplary embodiment of the present invention.

FIG. 3 is a flowchart showing an example of prohibiting output of a transmission code in the embodiment of FIG. 1 by using a standby mode of a microcomputer.

FIG. 4 is a block diagram showing a conventional remote control transmitter.

[Explanation of symbols]

 1 Operation Key Reading Section 2 Operation Key Type Discrimination Section 3 Remote Control Output Waveform Creation Section 4 Infrared LED 5 Operation Key Change Detection Section 6 Register 7 Counter 8 Comparator 9 Transmission Code Output Control Section 10 Waveform Data Reading Section 11 Waveform Data Change Detection unit 41-45 processing

Claims (3)

[Claims] 1. A remote control transmitter comprising means for outputting a transmission code by inputting an operation key, a counter operating during transmission, and a comparator for comparing a value of the counter with a separately set time. Means for detecting a change in the transmission code, means for outputting a reset signal for resetting the counter when the change in the transmission code is detected by the means, and a transmission code according to a comparison result of the comparator A remote control transmitter, comprising: means for controlling switching between permission and prohibition of output of the remote control. 2. The remote control transmitter according to claim 1, wherein the means for detecting a change in the transmission code is a means for detecting a change in a pressed operation key. 3. The remote control transmitter according to claim 1, wherein the means for detecting a change in the transmission code is a means for detecting the change in the waveform data by reading the waveform data of the transmission code actually output. .