JP2779791B2 - Key device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key device in which a transmission circuit for remotely locking and unlocking a lock device is housed in a resin holding portion provided at the base of a mechanical key body. .

[0002]

2. Description of the Related Art In a key device of this type, a transmission circuit is composed of precision electronic components. Therefore, the transmission circuit is electrically insulated from the outside in a resin case of a key holding portion and operates the transmission circuit. An operation unit including a push button and the like is provided on an outer surface of the case. By the way, when the key body is inserted into the key cylinder when the human body is charged with static electricity, the key body is removed from the human body through the metal key despite the fact that the key holding part is a resin case with relatively large dielectric strength. A surge current may flow to the vehicle body.
This is considered to be one of the causes of the fact that the push button portion is formed of a thin portion having flexibility, and thus has a lower dielectric strength than other portions, and discharges to the key body through the thin portion. If the transmission circuit is arranged close to the push button, the surge current may flow into the transmission circuit, destroying the IC chip and other circuit elements and damaging the function of the key device. There is. Also,
When the key device has an external terminal electrically connected to the vehicle side, for example, a charging terminal, since this external terminal has an exposed structure and is connected to an electric circuit of the key device, When the human body discharges to the external terminal, a surge current flows into the transmission circuit, and in this case, the same problem as described above also occurs. As one means for solving such a problem, the present applicant has proposed an apparatus described in Japanese Patent Application Laid-Open No. 4-80482.

[0003]

However, in the device disclosed in the above-mentioned publication, the earth plate is directly connected to the key plate, so that it is necessary to arrange the earth plate to a certain extent near the key plate. This causes a problem that the layout of the push buttons arranged close to the ground plate is also restricted.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art, and includes a metal key plate,
A resin holding case provided at a base of the key plate, a printed circuit board mounted with a transmission circuit for transmitting a radio signal to remotely lock and unlock the lock device, and housed in the holding case; A key unit provided on the surface of the case and having an operation unit for operating a switch of the transmission circuit, wherein an earth plate connected to a ground pattern of the printed circuit board is provided in the gripping case in proximity to the operation unit. , The ground pattern ,
Metal pin for connecting and fixing the printed circuit board and key plate
It is obtained by the so that is connected to the key plate via a down.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan sectional view of a key device according to the present invention, and FIG.
3 is a side sectional view of FIG. 1, FIG. 3 is an explanatory view of the operation of the key device according to the present invention, and FIG. 4 is a partial side sectional view of FIG.

As shown in FIGS. 1 and 2, a printed board 3 is fixed to the upper surface of a base 2 of the key plate 1 by metal pins 14 and accommodates the printed board 3 and the base 2. Thus, the resin holding case 4 is provided. A circuit ground pattern 15 is appropriately provided over a wide area on the printed circuit board 3, and one side thereof has electronic components such as an IC chip 5 having a transmission circuit and the like and a push button for operating the transmission circuit. The switch 6 is mounted. On the other side, a power supply section including a chargeable / dischargeable built-in battery 7 is formed.

A pressing plate 8 made of rubber is provided on the surface of the gripping case 4 so as to be exposed. The pressing force applied to the pressing plate 8 is appropriately formed with a slit or the like and formed thin. The flexible thin part 9 is bent and transmitted to the push button switch 6. Also, the grip case 4 includes:
A pair of light emitting diodes 17a and 17b are provided at the front thereof, and the light emitting diodes 17a and 17b are electrically connected to the transmission circuit. When the pressing plate 8 is pressed, the transmitting circuit is operated via the push button switch 6, and the infrared code signals are transmitted from the light emitting diodes 17a and 17b according to the output signal of the transmitting circuit, and the locking device on the vehicle side is used. Is remotely locked and unlocked.

As shown in FIGS. 1 to 3, on both sides of the key plate 1, a pair of charging terminals 10a and 10b connected to the printed circuit board 3 are provided exposed through insulating resins 11a and 11b. When the key plate 1 is inserted into the ignition key cylinder of the vehicle and turned to the ON position, the charging terminals 10a and 10b are connected to the terminal on the ignition key cylinder side, whereby the voltage of the vehicle battery is reduced. The battery is charged by being applied to the built-in battery 7. The charging terminal 1
Reference numerals 0a and 10b denote 4's arranged on the printed circuit board 3.
Connected to the built-in battery 7 via a rectifier circuit including diodes 12a, 12b, 12c, and 12d,
This ensures that the polarity of the charging voltage is constant irrespective of the direction of insertion of the key plate 1 into the ignition key cylinder. Here, the diode 12a,
12b is a Zener diode, and a charging terminal 10a,
When a voltage equal to or more than a predetermined value is applied from 10b, a current in the reverse direction flows. Further, the printed circuit board 3 and the key plate 1 are provided with press-fit holes 3a, 1a formed in the printed circuit board 3 and the key plate 1, respectively.
Is press-fitted with a metal pin 14 to fix the connection. The circuit board ground pattern 15 is appropriately provided over a wide range on the printed circuit board 3, and the ground pattern 15 is formed all around the press-fit hole 3 a of the pin 14. Pin 1
4 and the key plate 1 via the press-fit hole 1a.

A metal ground plate 13 having a circular hole facing the push button switch 6 is disposed near the lower end of the pressing plate 8 inside the gripping case 4. Is formed with leg pieces 13a. The leg 13a is connected to the ground pattern 15 on the printed circuit board 3 so that the surge current from the thin portion 9 can flow to the key plate 1 via the earth plate 13. Have been.

Next, the operation of this embodiment will be described. When the key plate 1 is inserted into the key cylinder of the vehicle door with the finger in contact with the pressing plate 8, static electricity charged on the human body enters the inside of the gripping case 4 through the thin portion 9, but this static electricity is transmitted to the ground plate. From 13, it passes through the pin 14 via the ground pattern 15, flows to the key plate 1, and finally falls to the vehicle body side ground 16 (arrow A in FIG. 3, a). When the key plate 1 is inserted into the door cylinder of the vehicle with the finger in contact with the charging terminal 10a, the static electricity charged on the human body flows through the Zener diode 12a in the opposite direction because of the high voltage, and the ground pattern 1
Then, the power is transmitted to the key plate 1 via the pin 14 and finally drops to the vehicle body-side ground 16 (arrows B, D, C, and A in FIG. 3). When the key plate 1 is inserted into the door cylinder of the vehicle with the finger in contact with the charging terminal 10b, the static electricity charged on the human body is transferred from the Zener diode 12b to the pin 14 via the ground pattern 15 in the same manner as described above. To the key plate 1 and finally to the vehicle body side ground 16 (see arrow G in FIG. 3).
E, ha, i). As described above, since the static electricity charged on the human body hardly flows into the transmission circuit, the circuit element is not destroyed. If the ground pattern 15 formed on the lower surface of the printed circuit board 3 is made to directly contact the key plate 1, the surge current can be reduced to the pin 1.
It can also flow directly to the key plate 1 without passing through the key plate 4.

[0011]

As described above, according to the present invention, in the key device in which the transmission circuit is mounted, the earth plate provided as a measure against surge current is connected to the ground pattern formed over a wide area on the printed circuit board. Because
There is an excellent effect that the degree of freedom of the arrangement position of the ground plate is increased, and the layout of the push button portion disposed close to the ground plate is not restricted. Further, the connection between the ground pattern and the key plate, printed circuit
Since the plate and the key plate are connected via the existing metal pins for connecting and fixing , there is an excellent effect that the connection can be easily performed.

[0012]

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a key device according to the present invention.

FIG. 2 is a side sectional view of FIG.

FIG. 3 is an operation explanatory view of the key device according to the present invention.

FIG. 4 is a partial side sectional view of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Key plate 1a Press-fit hole 2 Base 3 Printed circuit board 3a Press-fit hole 4 Grasping case 5 IC chip 6 Push button switch 7 Built-in battery 8 Press plate 9 Thin part 10a Charging terminal 10b Charging terminal 11a Insulating resin 11b Insulating resin 12a Zener diode 12b Zener Diode 12c Diode 12d Diode 13 Ground plate 14 Pin 15 Ground pattern 16 Car body side ground 17a Light emitting diode 17b Light emitting diode

Claims (1)

(57) [Claims] A metal key plate; a resin gripping case provided at a base of the key plate; and a transmission circuit for transmitting a radio signal to remotely lock and unlock the lock device. A key device comprising a printed circuit board accommodated in a case, and an operation unit provided on a surface of the gripping case and operating a switch of the transmission circuit, wherein an earth plate connected to a ground pattern of the printed circuit board is provided. Provided in the grip case in close proximity to the operation unit, the ground pattern and the printed circuit board
Key via a metal pin that connects and fixes the key plate
A key device connected to a plate .