JPH0330531Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is installed in the door of a car, and when the position of the door keyhole cannot be confirmed at night, the switch can be activated by performing a specific operation, for example, by pulling the doorknob. The present invention relates to a device for operating a door key to light up an illumination light provided in a key hole of the door key.

[Conventional technology]

Conventionally, the structure of this type of lighting device is as shown in FIG.
Since a magnet 6 is attached to the door by an appropriate method such as adhesive, by pulling the doorknob 4 toward you, the magnet 6 moves as shown by arrow A in the figure. At this time, a reed switch 7 which is closed by magnetic force is disposed near the final position of the movement, and the reed switch 7 closes when the magnet 6 approaches and gives a signal to the timer 2. Further, the key hole 8a of the door key 8 can be illuminated by a small light source 3 such as a light emitting diode, so that the output of the timer 2, that is, the power supply for a certain period of time after the reed switch 7 is closed, is illuminated. The keyhole 8a is illuminated by driving the light source 3. Normally, the output of the timer 2 is also connected to the room lamp and the ignition key lamp (not shown) at the same time, and the time set in the timer 2 also changes when the car is turned on after the door is opened. A time period is set that is sufficient for the driver to get on the vehicle and then insert the ignition key into the keyhole, and these structures and operations are collectively referred to as an entry system. In addition, the reference numeral 9 in the figure is an automobile body.

[Problem that the invention attempts to solve]

However, in the conventional technology, it is necessary to first pull the doorknob, and this action is essentially the action of opening the door, which gives the user a sense of strangeness. This requires a complicated procedure of first pulling the doorknob, turning on the light in the keyhole, unlocking the key, and then pulling the doorknob again to open the door. This also created the problem of unnecessarily confusing people.

[Means for solving problems]

As a concrete means to solve the above-mentioned problems, a switch part is provided in the door part of the car,
A keyhole lighting device comprising a lighting section provided in a keyhole, wherein the switch section is a capacitance type proximity switch, and the output of the switch is a differentiated output. By providing this system, the procedure for unlocking a car door is the same both during the day and at night, thereby solving the above-mentioned conventional problems.

〔Example〕

Next, the present invention will be explained in detail based on an embodiment shown in the drawings. In order to facilitate understanding, the same parts as in the conventional example will be described with the same reference numerals.

The reference numeral 1 in FIG. 1 is a capacitance type proximity switch, and its structure mainly consists of a sensor 1a made of a conductive material and a detection circuit 1b including an oscillation circuit.The detection principle is as follows. For example, when a human body or the like comes close to the sensor 1a, a stray capacitance corresponding to the proximity is generated between the human body and the sensor 1a. At this time, by making the tank circuit (resonance circuit) that determines the oscillation frequency of the oscillation circuit provided in the detection circuit 1b include the stray capacitance generated in the sensor 1a portion, the oscillation circuit can be controlled by the human body. The frequency changes depending on the proximity, and a proximity switch is obtained by converting this change into a voltage change using, for example, an integrating circuit and performing a switching operation using an appropriate voltage comparator. Since the output signal of the proximity switch described above is continuous, that is, as long as the proximity of the object continues, the output signal continues to be generated, so by providing the detection circuit 16 with a differentiating circuit, it can be made into a pulse-like output.

The output of the proximity switch 1 described above is output to the timer 2 to turn on the light source 3, but these operations are exactly the same as those described in the conventional example, and the description thereof will be omitted here.

FIG. 2 specifically shows one of the most preferable methods of providing the sensor 1a of the proximity switch 1 on the door of an automobile, in which the sensor 1a is also used as the door key 8. At this time, the door key 8 needs to be electrically insulated from the automobile body 9, so when the door key 8 is attached to the automobile body 9, it is attached via a suitable insulating bushing or the like. By arranging the sensor 1a in this manner, the keyhole 8a will be illuminated simply by bringing a hand or the like close to it.

[Effect of idea]

As explained above, by using a capacitance type proximity switch as the switch part of the keyhole illumination device, the same operation can be performed both during the day when the hand holding the car key is brought close to the keyhole and at night. The keyhole is illuminated, there is no need to force the user to perform special operations at night, and the device has an excellent effect of providing a familiar operating procedure.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a keyhole illumination device according to the present invention, Fig. 2 is an explanatory diagram of an example of installing a sensor when implementing the present invention, and Fig. 3 is a schematic cross-sectional view showing a conventional example. be. 1... Proximity switch, 1a... Sensor, 1b...
...Detection circuit, 2...Timer, 3...Light source.

Claims (1)

[Scope of utility model registration request] In a keyhole lighting device that is installed in a door of an automobile and consists of a switch part and a lighting part provided in a keyhole, the switch part is a capacitance type proximity switch, and the output of the switch is a differentiated output. A keyhole lighting device characterized by: