JPS6313072Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an in-vehicle keyboard illumination control device that controls the illumination of a keyboard as a data input device of an in-vehicle computer such as a so-called drive computer at night.

Conventionally, when lighting an in-vehicle keyboard at night, it has been proposed to turn on a keyboard lighting lamp in conjunction with a lighting switch such as a headlamp, but with such a configuration, the lighting lamp remains on during driving. Therefore, the illumination light may impede safe driving and waste power consumption. In addition, in view of this drawback, it is conceivable to turn on the indicator lamp of the keyboard illumination lamp or the switch for the illumination lamp only when the vehicle is stopped, but if the keyboard is not operated for a long time when the vehicle is stationary There is a drawback to lighting.

The present invention was made to solve the above-mentioned drawbacks, and each time the vehicle is stopped at night, the keyboard illumination lamp or the indicator lamp of the illumination lamp switch lights up, but if no keys are pressed on the keyboard, the indicator lamp lights up for a predetermined period of time. It is an object of the present invention to provide a lighting control device for an in-vehicle keyboard that is configured to later turn off an indicator lamp of a lighting lamp or a switch for the lighting lamp, thereby preventing unnecessary lighting.

An embodiment of the present invention will be described below based on the drawings. In the drawings, a stop detection section 1 detects the vehicle speed and outputs a stop detection signal of H level when the vehicle is stopped. The night detection unit 2 includes a small or headlight 21, a lighting switch 22, and an inverter 23 connected to a connection point a of these.
Outputs a level night detection signal. The room lamp lighting detection section 3 includes a room lamp 31 and a room lamp switch 32, and outputs an L level signal when the room lamp 31 is turned on. Timer circuit 4
consists of an oscillator 41, a counter 42, a flip-flop 43, and an inverter 44.
When the reset signal generated at the rise of the stop detection signal is supplied from the one-shot circuit 5 immediately after the vehicle stops, the timer operation is reset to the initial state, and the timer signal remains at H level until a predetermined timer period elapses. Output.
During the timer time, when a key on a keyboard (not shown) is operated to input data, the key operation detection section 6 detects the key operation and sends an H level key operation detection signal via the OR circuit 7. counter 4
2 and reset the counter 42. Furthermore, when the timer period expires, the counter 4
As the output of the flip-flop 43 is inverted to H level, the timer signal is inverted to L level, and the timer signal is inverted to L level until the stop detection signal of H level is output from the stop detection section 1 again. Maintain this state. Drive circuit 8 is a resistor
When the output supplied from the AND circuit 9, which consists of R1, R2, and a transistor Tr, and which calculates the AND of the respective outputs of the stop detection section 1, nighttime detection section 2, room lamp lighting detection section 3, and timer circuit 4, is at H level. , the indicator lamp 10 of the keyboard illumination lamp or the illumination lamp switch is turned on.

Incidentally, the above-mentioned stop detection section 1 may be a handbrake switch. Further, the nighttime detection section 2 may be an optical sensor that detects surrounding brightness.

The embodiment of the present invention has the above-mentioned configuration, and its operation will be explained below. When the vehicle stops, a stop detection signal of H level is output from the stop detection section 1, and at the same time, a reset signal generated from the one shot circuit 5 is sent to the counter 42 via the OR circuit 7 in synchronization with the rising edge of the stop detection signal. It is applied to the reset terminal R and directly to the reset terminal R of flip-flop 43, which resets counter 42 and flip-flop 43. Therefore, the timer circuit 4 outputs an H level timer signal. At this time, assuming that the small or headlight 21 is turned on and the room lamp 31 is turned off, the nighttime detection signal and the room lamp lighting detection signal of H level are output from the nighttime detection section 2 and the room lamp lighting detection section 3. Output. As mentioned above, when the outputs of the stop detection section 1, the nighttime detection section 2, the room lamp lighting detection section 3, and the timer circuit 4 become H level, the AND circuit 9 supplies an H level signal to the drive circuit 8. Drive circuit 8
turns on the indicator lamp 10 of the keyboard illumination lamp or the illumination lamp switch.

If a key on the keyboard is operated to input data during the timer operation, an H-level key operation detection signal is supplied from the key operation detection section 6 to the reset terminal R of the counter 42 via the OR circuit 7, so that the counter 42 is reset and the timer time is counted again from the beginning.

On the other hand, if no key operation is performed within the predetermined timer time, the outputs of the counter 42 and flip-flop 43 are both inverted to H level at the end of the timer time, and the timer signal from timer circuit 4 is inverted to L level. Therefore, the output of the AND circuit 9 becomes L level, and the drive circuit 8 automatically turns off the keyboard illumination lamp or the indicator lamp 10 of the illumination lamp switch.

As described above, the present invention includes a stop detection section 1 that detects that the vehicle is in a stopped state and outputs a stop detection signal, a nighttime detection section 2 that detects that it is nighttime and outputs a stop detection signal, A timer circuit 4 that starts timer operation when the vehicle is stopped, outputs a timer signal for a predetermined period of time, and resets the timer operation when a key operation on the in-vehicle keyboard is performed while the timer is operating.
and a drive circuit 8 for lighting and driving the illumination lamp of the in-vehicle keyboard or the indicator lamp 10 of the illumination lamp switch, and energizes the drive circuit 8 when the stop detection signal, the nighttime detection signal and the timer signal are output. This is an in-vehicle keyboard lighting control device characterized in that the above-mentioned illumination lamp or indicator lamp 10 is turned on when the car is stopped at night. Since the indicator lamp on the switch lights up, you can easily operate the keyboard of the drive computer, etc. Additionally, if no key is pressed for a predetermined period of time or when the vehicle is running, the lamp will automatically turn off, leading to power savings and safe driving. Furthermore, effects such as saving the driver the trouble of turning on and off the lamps can be obtained.

[Brief explanation of the drawing]

The drawing is a circuit configuration diagram showing an embodiment of the lighting control device for the in-vehicle keyboard of the present invention. 1...Stop detection unit, 2...Night detection unit, 3...
Room lamp lighting detection section, 4...Timer circuit, 5
...One-shot circuit, 6...Key operation detection section,
7...OR circuit, 8...Driving circuit, 9...AND circuit, 10...Lamp for keyboard illumination or indicator lamp of the switch for the illumination lamp.

Claims (1)

[Scope of utility model registration request] A stop detection unit 1 detects that the vehicle is in a stopped state and outputs a stop detection signal, and a nighttime detection unit 2 detects that it is nighttime and outputs a night detection signal.
a timer circuit 4 that starts a timer operation when the vehicle is stopped, outputs a timer signal for a predetermined period of time, and resets the timer operation when a key on the in-vehicle keyboard is operated during the timer operation; and an illumination lamp for the in-vehicle keyboard. Or a drive circuit 8 that drives the indicator lamp 10 of the illumination lamp switch to turn on.
A lighting control device for an in-vehicle keyboard, characterized in that the drive circuit 8 is energized to light the illumination lamp or indicator lamp 10 when the stop detection signal, the nighttime detection signal, and the timer signal are output. .