JPH0120202Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an off-delay device for an automobile lamp.

Cars are equipped with room lamps, step lamps, etc., and these lamps are turned on when the door is opened and turned off when the door is closed.These lamps are turned on when the door is opened, illuminating the interior and the footwells at the entrance and exit. Generally, the vehicle is constructed to be convenient for getting on and off the vehicle, and the light is turned off when the door is closed so as not to interfere with driving (for example, Japanese Utility Model Publication No. 49-28660).

However, with the above-mentioned general devices, when trying to get into a parked car at night, it is difficult to insert the key into the keyhole of the door and unlock it in the dark, and it is difficult to open the door. After getting in the car, closing the door and inserting the ignition key into the ignition key hole to start the engine, it is difficult to insert the ignition key in the dark. have.

Therefore, a door handle switch that is activated by the operation of the door outer handle has been conventionally provided, and a door key hole lamp that lights up when the door handle switch is turned on to illuminate the door key hole is also provided. A circuit is provided to turn on lamps, step lamps, etc., the above-mentioned door key hole lamps go off when the door is opened, and room lamps, step lamps, etc. are turned on only for a sufficient period of time for the occupant to get in the car and start the engine with the ignition key. The vehicle is equipped with an off-delay circuit that keeps the lights on, making it easier to ride at night and start the engine.

However, conventional devices equipped with off-delay circuits as described above require one or two dedicated relays in order to turn off only the keyhole lamp in the door when the door is opened, which not only requires a large number of parts but is also expensive. Every time the door handle switch is turned on, such as when the car is parked on the street or a child is playing a trick, not only the keyhole lamp in the door but also the interior lamp, stair lamp, etc. will remain on for a predetermined period of time, reducing power consumption. This has the problem of increasing battery life in some cases.

The main points of this invention are that the door key hole lamp is an extremely small lamp and poses almost no problem in terms of power consumption, and that room lamps and step lamps that consume large amounts of power do not need to be turned on until the door is unlocked and the door is opened. By focusing on this fact, the present invention is intended to provide a device that can solve all of the problems of the conventional off-delay circuit as described above.The present invention will be explained below with reference to the accompanying drawings.

In Fig. 1, 1 is a power supply (battery), 2 is a door switch that is turned on when the door is opened and turned off when it is closed, and 3 is an indoor lamp such as a room lamp or an ignition key hole lamp. The indoor lamp lighting circuit A in which the door switch 2 and the indoor lamp 3 are connected in series is the same as that commonly used in the past.

Reference numeral 4 denotes a door handle switch that is turned on by operating the door outer handle and activates a timer 5. When the door handle switch 4 is turned on, power is supplied from the power source 1 through the timer 5 to earth from the door key hole lamp 6. The door keyhole lamp lighting circuit B is closed and the door keyhole lamp 6 is lit, and when a set time has elapsed, the timer 5 becomes non-conductive and the door keyhole lamp 6 is automatically turned off.

Door switch 2 of the above indoor lamp lighting circuit A
and the part between the indoor lamp 3, the timer 5 of the door key hole lamp lighting circuit B, and the door key hole lamp 6
The part between is the connection circuit C through the backflow prevention element 7 and the normally open switch 8a of the relay 8, where the forward direction is the direction from the door key hole lamp lighting circuit B to the indoor lamp lighting circuit A. When the coil 8b of the relay 8 connected in parallel with the indoor lamp 3 of the indoor lamp lighting circuit A is energized, the switch 8a is turned on.

The operation of the above device will be explained below with reference to the second diagram illustrating the operation mode.

When getting into a parked car, the driver first operates the door outer handle to turn on the door handle switch 4. Then, the timer 5 becomes conductive and the door keyhole lamp 6 lights up.
The timer 5 is switched to non-conduction after a predetermined time (set time) has elapsed, but the door key hole lamp 6 continues to be lit while the timer 5 is in a conductive state, that is, for the set time _T1 of the timer 5.

Even if the timer 5 becomes conductive and the door key hole lamp lighting circuit B is closed, the door switch 2 remains off until the door is opened, and the switch 8 of the relay 8 remains off.
Since a is off, indoor lamps 3 such as a room lamp, a step lamp, and an ignition keyhole lamp do not light up.

After the door key hole lamp 6 lights up and the door key hole becomes bright, the driver inserts the key into the door key hole to unlock and open the door. Then, door switch 2 is turned on, indoor lamp lighting circuit A is closed, indoor lamp 3 is turned on, and at the same time relay 8 is turned on.
Current also flows through the coil 8b of the relay 8, turning on the switch 8a of the relay 8 and closing the connection circuit C.

When the driver closes the door after getting in the car, door switch 2 turns off, but switch 8 of relay 8 turns off.
Since a is self-maintained in the on state by the coil 8b, the connection circuit C remains closed, and current flows from the power source 1 through the timer 5 and through the connection circuit C to the indoor lamp 3, closing the door. However, as long as the timer 5 is in a conductive state, the indoor lamp 3 continues to be lit, and the engine can be easily started by inserting the ignition key into the ignition key hole.

Thereafter, when the timer 5 becomes non-conductive, the door keyhole lamp 6 goes out, the indoor lamp 3 also goes out, and current no longer flows through the coil 8b, so the switch 8a of the relay 8 turns off.

After that, when the door is opened, the door switch 2 is turned on and the indoor lamp 3 is turned on, and when the door is closed, the door switch 2 is turned off and the indoor lamp 3 is turned on.
goes out. In that case, when the door switch 2 is turned on and the indoor lamp 3 is lit, a current flows through the coil 8b of the relay 8, turning on the switch 8a and closing the connection circuit C. Since the element 7 is provided, the door keyhole lamp 6 will not be lit.

In the above, the set time T ₁ of the timer 5 is
The time T ₂ required from when the door handle switch 4 is turned on until it is unlocked and the door is opened;
The time _T3 required from opening the door until the driver gets in the car, sitting down, and closing the door, and the time required from closing the door to inserting the key into the ignition key hole and starting the engine. Assuming a waxing time T ₄ etc., these times T ₂ , T ₃ ,
The contact time _T1 of the timer is set to the sum of _T4 .

As described above, in the present invention, even if the outer door handle is tampered with when parking, the door handle switch 4 is turned on and the timer 5 starts operating, the door key hole lamp 6 only lights up. The hole lamp 6 poses almost no problem in terms of power consumption, and the indoor lamp 3, which consumes a large amount of power, will never turn on unless the door is opened, so the problem of power consumption due to pranks can be almost completely resolved. When exiting the vehicle, the indoor lamp does not need to be off-delayed, and the indoor lamp is turned off immediately to save power consumption. In addition, it is necessary to turn off the door keyhole lamp when the door is unlocked and the door is opened. One or two hot relays are no longer required, and a desired off-delay circuit can be configured by combining one timer 5 and one relay 8, resulting in a reduction in the number of parts compared to conventional devices, and the associated cost savings. It is possible to reduce costs, and it can bring about great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the operation mode of the circuit of FIG. 1. 1...Power supply, 2...Door switch, 3...Indoor lamp, 4...Door handle switch, 5...
Timer, 6... Door key hole lamp, 7... Current backflow prevention element, 8... Relay, A... Indoor lamp lighting circuit, B... Door key hole lamp lighting circuit,
C... Connection circuit.

Claims (1)

[Scope of utility model registration request] A door keyhole lamp lighting circuit that lights up the door keyhole lamp by a timer that maintains a conductive state for a predetermined period of time when the door outer handle is operated, and a power source. Provide a connection circuit that connects the part between the door switch and the indoor lamp of the indoor lamp lighting circuit that goes from the door switch that is turned on when the door is opened to the ground through the indoor lamp such as a room lamp or step lamp. In addition, the connection circuit includes a relay that is turned on when current is flowing through the indoor lamp, and a current backflow prevention element whose forward direction is from the door key hole lamp lighting circuit to the indoor lamp lighting circuit. An off-day delay device for automotive lamps, characterized in that they are installed in series.