JPS5818362Y2 - Remote control receiver malfunction prevention circuit - Google Patents

Description

[Detailed description of the invention] This invention relates to a malfunction prevention circuit for a remote control receiver.

Conventional remote control devices are used, for example, in television receivers to switch VHF channels, UHF channels, and turn on/off power.
It has functions such as F switching and volume adjustment, and the power supply is 0N.
- For OFF and volume adjustment operations, a rotary relay switch is operated by a remote control signal, and the rotor of the rotary relay switch is switched step by step. Perform a series of operations as follows.

Now, if the rotor of the rotary relay switch of the remote control device is rotated by the ultrasonic remote control signal and the power is turned off, the television receiver will become inoperable.

However, since operating power is always supplied to the remote control device, external noise of approximately the same frequency as the remote control signal,
For example, the rotary relay switch may operate unexpectedly due to the ringing of a telephone or the noise of a jet plane, and the television receiver may become operational.

The present invention is a novel malfunction prevention circuit for electronic equipment that solves these problems, and one embodiment will be described with reference to the drawings.

1 is the main body of the television receiver, 2 is a remote control device built into the television receiver, 3 is an ultrasonic microphone installed in the wrong device, 4 is a main power switch located on the front panel of the television, 5 operates on remote control signals and O
This is a sub switch consisting of a rotary relay that controls only the FF function.

The first contact terminal a of the main power switch 4 is connected to the first contact terminal a'L a' of the sub switch 5, and the second contact terminal a of the main power switch 4 is connected to the second contact terminal of the sub switch 5. b/, b/, and one end of the rotor 6 of the rotary relay is connected to the operating power supply terminal c' of the television receiver 1 and the remote control signal 2.

Connect to C'.

Next, the operation of the malfunction prevention circuit of the present invention will be explained.

Now, for example, when the rotor 6 of the rotary relay constituting the sub switch 5 is at the first contact terminal a', the power switch 4
When the movable element 7 is connected to the first contact terminal a, power supply voltage is supplied to the television receiver and the remote control device 2, and the television receiver and the remote control device 2 are brought into operation.

After that, a remote control signal transmitter (not shown) transmits an ultrasonic remote control signal of frequency A (7), which is received by the ultrasonic microphone 3 and selected by the frequency selection circuit in the remote control device 2. A rotary relay switch (not shown) that controls the volume adjustment function operates, and if the rotor of the rotary relay switch is switched step by step, a series of operations such as volume adjustment → volume → volume → low volume can be performed. I do.

The next time the TV program ends and you turn off the TV receiver,
When a remote control signal of frequency B, which is different from frequency A, is transmitted, it is received by the ultrasonic microphone 3, is selected by the frequency selection circuit, and the sub switch 50 which controls the OFF function is connected to the second contact terminal b'. The power supply voltage is not supplied to the television receiver 1 and the remote control device 2, and the television receiver is in an inoperable state.

Therefore, even if external noise with a frequency that is almost the same as that of the remote control signals of frequencies A and B occurs, the television receiver will never become operational due to external noise because power supply voltage is not supplied to the remote control device 2. Connect the mover 7 of the main power switch 4 located on the front panel of the television to the second contact terminal, and turn on the television receiver 1.
Only when a power supply voltage is supplied to the operation power supply terminal C of the remote control device 2, the television receiver becomes operational.

As described above, according to the malfunction prevention circuit of the present invention, the television receiver will never become operational unless the main power switch is operated, and the television receiver will not operate due to external noise while you are away, so you can rest assured. You can go out and have great utility value.

[Brief explanation of the drawing]

The drawing shows a malfunction prevention circuit showing one embodiment of the present invention. 1...Television receiver body, 2...
Distance control device, 3... Ultrasonic microphone, 4...
...Main power switch, 5...Sub power switch.

Claims (1)

[Scope of utility model registration request] A movable terminal of a single-circuit two-contact switch constituting a main power switch with alternating on and off sides is connected to a commercial power source, and the two contacts are connected to terminals of a remote control switch that is sequentially reversed by reception of a remote control off signal. and configured to supply power to the remote control receiver and the controlled device via the main power switch and the remote control switch, and not to be remotely operated when the main power is turned off or after the remote control switch is reversed. A remote control receiver malfunction prevention circuit featuring: