JPH0727243Y2 - Lighting control device for vehicle interior lights - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lighting control device for an interior lamp for a vehicle, which facilitates lighting of a room lamp.

(Prior Art) Room lamps are installed in vehicles such as automobiles,
It is designed to provide indoor lighting at night. If the room lamp is turned on when the vehicle is traveling, the room lamp is often reflected on the windshield of the vehicle and impairs the visibility in the front. Therefore, the room lamp is generally turned off during traveling. The room lamp is convenient to turn on when getting on and off the vehicle at night, so the connection to the door switch is also made. That is, by switching the room lamp switch to the door switch circuit side, the light is turned on when the door is opened and turned off when the door is closed.

(Problems to be solved by the invention) As described above, in the conventional circuit, the room lamp switch is operated to the on side, or is turned on when the door is opened when the room lamp switch is switched to the door switch circuit side. However, when the vehicle is stopped and the map is checked, the room lamp switch must be operated each time the door is not opened. Further, in connection with this, when the room lamp is operated by the room lamp switch, there is a possibility that the passenger may get off the vehicle as it is and waste the battery power. An object of the present invention is to provide a lighting control device for a vehicle interior light in which this point is improved.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a keyhole in a lighting control device for a vehicle interior light in which a room lamp switch having a door contact is connected to the room lamp. An ignition switch that turns on and off by inserting a key and turning it, a parking brake switch that turns on and off in relation to the operation of the parking brake, and an optical sensor that emits different signals when external light is detected and when it is not detected. With the ignition switch, the parking brake switch and the optical sensor, when the room lamp switch does not detect outside light on the side related to the door operation, and the ignition switch is operated while the vehicle is stopped. The room lamp is configured to light up.

(Operation) With such a configuration, when the vehicle is stopped, the parking brake is pulled, and the key of the ignition switch is turned to be turned on, that time is the night when the optical sensor does not sense external light. Then, the room lamp will be turned on automatically.

(Embodiment) Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 shows an outline of the present invention, in which 1 is turned on by inserting a key into a key hole and rotating it, Ignition switch to be turned off, 2 is a parking brake switch that is turned on and off in association with the operation of the parking brake, 3 is a small lamp switch, 4 is an optical sensor using a CdS element, and 5 is a room lamp switch. The optical sensor 4 emits a signal of "1" when it detects external light outside the vehicle body, and emits a signal of "0" when it does not detect it. Further, each switch shown by reference numerals 1, 2, 3, and 5 outputs a signal of "1" when it is on, and outputs a signal of "0" when it is off.

6 is an AND circuit, and 7 is a NOR circuit. The AND circuit 6 is connected so as to receive the output signals of the ignition switch 1 and the parking brake switch 2, and the NOR circuit 7 is connected so as to receive the output signals of the small lamp switch 3 and the optical sensor 4. The output sides of the AND circuit 6 and the NOR circuit 7 are connected to the input side of the AND circuit 8, and the output side of the AND circuit 8 is connected to the input side of the OR circuit 9 together with the output side of the room lamp switch 5. There is. OR circuit 9
The room lamp 10 is connected to the output side of the.

FIG. 2 shows an example of a concrete circuit shown in FIG. 1, and the same members as those in FIG. 1 are designated by the same reference numerals. In the figure, 11 is a battery as a power source, the negative electrode side is grounded to the vehicle body, and the negative side of each part is made common by this grounding circuit. Therefore, the ground side of each component will be described as simply grounded. The room lamp 10, the small lamp switch 3, and each end of the ignition switch 1 are connected to the positive electrode side of the battery 11.

The other end of the room lamp 10 is connected to the movable contact of the room lamp switch 5. The loop lamp switch 5 has an ON contact as a fixed contact with which the movable contact selectively contacts,
An off contact and a door contact are provided, the on contact is grounded, and the off contact is not connected. Further, the door contact is connected to the movable contact of the door switch 12.
The door switch 12 has a shut contact as a fixed contact and an open contact, the shut contact is not connected, and the open contact is grounded. 13 is a control circuit. The control circuit 13 is provided with transistors 14 and 15, and the collector of the transistor 14 is connected to the connection point between the door contact of the room lamp switch 5 and the movable contact of the door switch 12.

The base of the transistor 14 is connected to the collector of the transistor 15 via the resistor 30, and the CdS element 4a is connected between the base and the emitter. Transistor 15
Has a resistor 16 connected between the base and the emitter, and this emitter is connected to one end on the ignition switch 1 side of a parking lamp 21 connected in series between the ignition switch 1 and the parking brake switch 2. ing. The other end of the parking brake switch 2 is grounded. The base of transistor 15 is resistor 17
And small diode switch 3 via diode 18
And the small lamp 20 are connected to the connection point. The other end of the small lamp 20 is also grounded. Transistor 14
The emitter of the parking lamp via diode 19
It is connected to the connection point between 21 and the parking brake switch 2.

The operation of this device thus configured will be described with reference to the flow chart of FIG. Lighting the room lamp 10 by contacting the movable contact of the room lamp switch 5 with the ON contact is the same as in the conventional case (steps 22, 23, 28). When the movable contact of the door switch 12 contacts the open contact when the movable contact contacts the door contact, the room lamp 10 lights up. When the door contact 12 is in contact with the shut contact, the door contact 12 does not turn on (steps 22, 23, 24, 29), but it turns on if the following conditions are satisfied.

That is, when the ignition switch 1 and the parking brake switch 2 are on and the small lamp switch 3 is off, the transistor 15 is on, so that the optical sensor 4 using the CdS element 4a does not detect outside light at night. Sometimes transistor 14 turns on, so
The room lamp 10 will be turned on (steps 24, 25,
26,27,28). Since the CdS element 4a has a positive resistance characteristic, the resistance value decreases when external light is detected. At this time, since the base and emitter of the transistor 14 are short-circuited, the transistor 14 is turned off and the room lamp 10 is not turned on. Room lamp 10 with the above conditions in place
When is lit, to turn off this room lamp 10,
Either turn off the ignition switch 1 or release the parking brake and turn off the parking brake switch 2. Therefore, it is possible to automatically turn off the light by the former when getting off the vehicle and by the latter when traveling. Therefore, since a timer circuit for turning off the light is not required, the circuit configuration becomes simple.

(Effect of the Invention) Since the present invention is the vehicle interior light lighting control device configured as described above, when the ignition switch is turned on after riding and the parking brake lever is turned on to turn on the parking brake switch, The lamp will turn on automatically. Therefore, it is convenient to take actions in the car before departure at night. In addition, as long as the parking brake switch is on until the vehicle gets off after the vehicle has stopped, the room lamp will continue to light up if the ignition switch is on, so you can simply turn off the ignition switch. You can turn off the lights, and you will never forget to turn them off. It is more convenient than operating the room lamp switch because the room lamp can be turned on while the vehicle is stopped by simply operating the small lamp switch so that the small lamp is turned off. In this case, the driver does not operate the small switch to turn off the small lamp when waiting for a traffic signal at night, so that the room lamp may inadvertently turn on when waiting for the signal. Absent. Since the conventional electrical wiring can be used as it is, the circuit configuration can be simplified and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram showing the outline of an embodiment of the present invention, FIG. 2 is a circuit diagram of a concrete example of the one shown in FIG. 1, and FIG. 3 is a flow chart for explaining the operation. 1 ... Ignition switch 2 ... Parking brake switch 3 ... Small lamp switch 4 ... Optical sensor 5 ... Room lamp switch 10 ... Room lamp 11 ... Battery 12 ... Door switch

Claims (1)

[Scope of utility model registration request] 1. A lighting control device for a vehicle interior light, comprising a room lamp connected to a room lamp switch having a door contact, and an ignition switch which is turned on and off by inserting a key into a key hole and rotating it, and a parking. A parking brake switch that turns on and off in association with the operation of the brake and an optical sensor that emits a different signal when external light is detected and when it is not detected are provided, and the ignition switch, the parking brake switch, and the optical sensor are used to operate the room. The light sensor does not detect outside light on the side where the lamp switch is related to door operation,
In addition, the vehicle interior light lighting control device is characterized in that the room lamp is configured to light up when the ignition switch is operated while the vehicle is stopped.