JP3297747B2 - Antistatic mechanism for in-vehicle equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a car stereo liquid crystal display device (hereinafter referred to as an LCD) which is mounted on a vehicle-mounted device, for example, a dashboard of a vehicle and has a detachable front panel.
And an antistatic mechanism for preventing charging to the periphery thereof.

[0002]

2. Description of the Related Art Conventionally, a ground connection for preventing charging due to static electricity from, for example, a human body to an LCD of a car stereo having a detachable front panel and the periphery thereof is made by LC.
The LCD controller holding D is led to the control board on which electronic components such as switches are mounted, routed to the front panel connector via the pattern circuit of this control board, and the car stereo body to which the front panel connector is connected Than the connector
The pattern circuit on the main board of the car stereo body was grounded to the car stereo body chassis.

[0003]

However, the above-mentioned conventional earth connection of the antistatic turtle of the LCD has the following problems. (1) To connect the front panel connector and the car stereo body connector to ground from the front panel side to the car stereo body side, it is necessary to increase the number of connector contacts by the number of ground contacts. (2) Leading the ground using the pattern circuit of the control board on the front panel side causes many restrictions on the design of the pattern circuit of the control board. (3) When the ground is led from the LCD to the chassis of the car stereo body by using a pattern circuit or a connector, a potential difference due to an increase in the resistance value occurs during that time, and the ground effect is reduced. (4) If the ground pattern is shared on the pattern circuit,
Static electricity flows into the pattern circuit, and as a result, an LCD malfunction may occur.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an LCD having a front panel on the side is provided.
It is an object of the present invention to obtain an antistatic mechanism for an in-vehicle device which can be achieved by using the shortest ground circuit without using a pattern circuit on a board from the chassis of the car stereo body to the chassis.

[0005]

In order to achieve the above-mentioned object, an antistatic mechanism for a vehicle-mounted device according to the present invention is provided in a vehicle-mounted device having a front panel detachably mounted on a front panel frame of the device body. A front panel having a panel portion and a front back panel portion, a holding member made of an electronic element stored in the front back panel portion and a conductive member for holding the electronic element, and a spring contact with a leg of the holding member. Ground terminal and shear
Is composed of a contact piece which is grounded to the sheet, when set the front panel is assembled to the front panel frame, a ground terminal and the contact piece from the member suppressing electrification generated in the electronic element and the periphery thereof Through the device chassis
To prevent the electronic circuit from being destroyed by static electricity.
Those were Unishi.

[0006]

The antistatic mechanism for a vehicle-mounted device according to the present invention configured as described above, for example, when static electricity from the human body is charged on the electronic element and its surroundings, the charged static electricity is reduced by the holding member on the front panel side and its holding member. Discharge can be caused to discharge to the chassis of the device main body through the contact piece of the device main body via the ground terminal which is in spring contact with the leg . By this
Thus, the circuit of the electronic element can be prevented from being damaged by static electricity .

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of a main part of an in-vehicle device according to the present invention. In this example, a car stereo having a detachable front panel will be described as an in-vehicle device. 2 is a cross-sectional view showing a state where the front panel is attached to the car stereo main body, FIG. 3 is a cross-sectional view showing the car stereo main body and the disassembled front panel, and FIG. 4 is a cross-sectional view showing an assembled state of the front panel. .

1 to 3, reference numeral 1 denotes a car stereo main body as an apparatus main body, reference numeral 2 denotes a mounting frame in which the car stereo main body 1 is accommodated and fixed substantially in agreement, and mounting frame 2 is a vehicle. Dashboard 3
The car stereo body 1 is attached to the recess 3a formed beforehand before the car stereo body 1 is attached. A chassis 4 serving as a frame of the equipment body is fixed to the front opening of the car stereo body 1, and a front panel frame 5 is fixed to the chassis 4 with screws (not shown) and provided on the front of the car stereo body. ing.

The fixing of the car stereo main body 1 to the mounting frame 2 described above is performed by a lock plate 7 having a mounting portion 7a at one end supported by screws 6 on a chassis 4 of the car stereo main body 1. More specifically, the lock plate 7 partially has an inclined surface 8 and can be elastically deformed in the vertical direction. The lock plate 7 is erected from both side edges on the free end side of the lock plate 7, and the back side is inclined rearward at a low angle. This can be performed by passing the two claw portions 9, 9 having 9 a, 9 a through holes 1 a formed in the upper frame of the car stereo body 1 and engaging with the engagement holes 2 a formed on the upper wall surface of the mounting frame 2.

The front panel 5a of the front panel frame 5 includes
A lock release hole 10 is formed in a portion corresponding to the inclined surface 8 of the lock plate 7 described above. This lock release hole 1
By inserting the unlocking key 11 into 0,
The tip 11a of the key 11 presses the inclined surface 8 of the lock plate 5 to deflect the lock plate 5 downward so that the claw 9 can be disengaged from the engagement hole 2a of the mounting frame 2.

On the other hand, a contact piece 12 having a substantially L-shaped cross section as a ground terminal on the front panel side, which will be described later, is formed on one end edge of the mounting portion 7a of the lock plate 7. As shown in FIG. 5, the front panel 5a of the front panel frame 5 is penetrated from the chassis 4 into a window hole 5b which is opened and protrudes toward the front side of the front panel 5a. Have been. The contact piece 12 also serves as a lock for the lock plate 7 by being inserted into the window hole 5b of the front plate 5a.

The front panel frame 5 is detachably mountable to a front panel indicated by the reference numeral 13. The front panel is detachable by the user to prevent the car stereo body 1 from being stolen. Front panel 1
3 constitute a housing in the front panel portion 14 and the front back panel portion 15 as shown in FIG. 3, the front panel
Control board 16 on which electronic components such as a switch, is mounted on the section 14, the holder 17, the lamp 18, the light guide plate 19, as an electronic element LCD20 and the LCD20
LCD restrainers 21 made of a conductive member having legs 21a as the restraining members. Further, a grounding plate 22 having a spring shape and formed in a substantially U shape is attached to the back plate 15a of the front back panel portion 15. The ground plate 22 is desired in an opening hole 15b formed in the back plate 15a of the front back panel portion 15.

A control panel 16, a holder 17, a lamp 18, a light guide plate 19, an LCD
20 and LCD suppressed 21 is incorporated, a cross-sectional view of the front back panel portion 15 front panel 13 fixed by screws (not shown) in the front panel unit 14 shown in FIG. The front panel 13 configured as described above has an LC
LCD restraint 21 made of a conductive member around the front surface of D20
And the display unit 20 of the LCD 20
a corresponds to the display window 14a of the front panel unit 14. And it is pressed against the grounding plate 22 having a spring property that the legs 21a is attached to the front back panel portion 15 of the LCD suppressed 21. Leg 21 of LCD holder 21
The ground plate 22 pressed by a is bent toward the rear side of the front back panel portion 15, but is prevented from protruding outside the opening hole 15b. This means that when the front panel 13 is handled by the user,
Safety precautions are taken to prevent contact with 2.

FIG. 2 is a sectional view showing a state in which the front panel 13 configured as described above is attached to the front panel frame 5 of the car stereo body 1 via connectors (not shown) provided respectively. That is, when the front panel 13 is attached to the car stereo body 1, the ground plate 22 desired in the opening 15 b of the front back panel portion 15 and the front panel frame 5 of the car stereo body 1
Can be brought into spring contact with the contact piece 12 protruding from the window hole 5b formed in the front plate 5a, and stable contact can be obtained. Due to the spring pressure contact between the ground plate 22 and the contact piece 12, the front panel 13
However, even if there is some play in the car stereo body 1, the ground plate 22 does not separate from the contact piece.

Next, a description will be given of the charge removal of the LCD 20 of the car stereo constructed as described above. In operation of the front panel section 14, static electricity from the human body is directly L
Since the display surface 20a of the CD 20 may be touched, LC
D20 and its periphery are charged by static electricity. If the static charge is left as it is, a malfunction of the LCD 20 occurs as described above. Therefore, in the present invention, the static electricity around the LCD 20 and its surroundings is
It is led to the presser 21 and flows from the leg 21a of the LCD 21 to the ground plate 22 which is in pressure contact with the leg 21a. This is achieved by providing a ground circuit from the lock plate 7 integrally formed with the piece 12 to the chassis 4 of the car stereo body 1.

As described above, the antistatic mechanism of the car stereo according to the present invention does not use the connector between the front panel 13 and the car stereo body 1 and uses the pattern circuit of the control board 16 on the front panel 13 side. Since the shortest ground circuit enables the grounding without causing a potential difference due to an increase in the resistance value, a reliable grounding effect without malfunction of the LCD 20 can be obtained. Therefore, a highly reliable antistatic mechanism that does not require the number of connector contacts for a ground circuit as in the related art, and is not subject to the restrictions on the design of the pattern circuit of the control board 16.

Here, the operation of attaching and detaching the car stereo body 1 to and from the attachment frame 2 will be described. In the attached state where the car stereo body 1 is housed in the attachment frame 2, as shown in FIG. 9 is engaged with and fixed to the engaging hole 2a of the mounting frame 2. When the car stereo body 1 is to be detached from the mounting frame 2 for some reason such as a failure from this state, first, the front panel 13 is detached from the front panel frame 5, and then the unlocking key 11 is moved to the front panel of the front panel frame 5. When inserted horizontally into the lock release hole 10 formed in the lock release key 5 a, the tip 11 a of the lock release key 11
Presses the inclined surface 8 of FIG.
As shown in (1), the claw portion 9 is detached from the engagement hole 2a of the mounting frame 2 by being elastically deformed downward. Then, by pulling out the car stereo main body 1 from the mounting frame 2 with the claw portion 9 being detached, the claw portion 9 moves along the inner wall of the upper surface of the mounting frame 2 and can be removed from the mounting frame 2.

When the car stereo body 1 is to be stored in the mounting frame 2 again, the car stereo body 1 with the unlocking key 11 pulled out from the unlocking hole 10 will be described.
When the lock plate 7 is inserted into the mounting frame 2, the lock plate 7 is elastically deformed downward by the slope 9 a of the claw portion 9 being pressed against the edge of the opening of the mounting frame 2,
The claw portion 9 moves along the inner wall of the upper surface of the mounting frame 2,
Thus, when the claw portion 9 reaches the engagement hole 2a of the mounting frame 2, the lock plate 7 is elastically restored, and the claw portion 9 is pushed up and engaged with the engagement hole 2a, thereby fixing the car stereo body 1. . After that, the front panel 13 is mounted on the front panel frame 5 to complete the mounting operation. At this time, the ground plate 22 attached to the front back panel portion 15 comes into contact with the contact piece 12 on the car stereo body 1 side.

Further, from the use state of the car stereo body 1, the user himself inserts the front panel frame 5 into the flot panel 13
By removing, the presence of the car stereo body 1 can be made inconspicuous, and the car stereo body 1 can be prevented from being stolen. Moreover, the car stereo body 1 without the front panel 13 has no function as a car stereo, and cannot be removed without the lock release key 11, so that there is no theft. Further, since the claw portion 9 of the lock plate 7 has a two bent and raised configuration, it is firmly engaged with the engagement hole 2a of the mounting frame 2, so that the car stereo body 1 is forcibly removed from the mounting frame 2. It does not come off when trying to withdraw.

The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention. For example, the ground circuit of the LCD 20 on the front panel 13 side is connected to the contact piece 12 on the car stereo main body 1 by a spring, and the ground plate 22 attached to the husunto back panel section 15 is grounded to the chassis 4. LCD without using plate 22
The leg 21a of the retainer 21 may be extended to the rear side of the front back panel 15, and the leg 21a may be brought into direct contact with the contact piece 12 of the car stereo body 1 by spring. Further, the contact piece 12 does not have to be formed integrally with the lock plate 7 and may be a separate one as long as it is connected to the chassis 4 of the car stereo body 1. Further, in the embodiment, the case of a car stereo has been described as the vehicle-mounted device, but the present invention can be widely applied to other vehicle-mounted devices having an LCD requiring an antistatic measure.

[0021]

As described above, the antistatic mechanism for an in-vehicle device according to the present invention can be applied to an in-vehicle device in which a front panel is detachably mounted on a front panel frame of a device body, and an electronic element stored in the front panel and its periphery. Is discharged from the holding member of the electronic element to the chassis of the device main body through the ground terminal and the contact piece which are in spring contact with each other, so that the following effects are obtained. (1) From the holding member of the electronic element, through the ground terminal on the front back panel and the contact piece on the front panel frame,
Since the shortest ground circuit grounded to the chassis is used , the grounding effect is improved without causing a potential difference due to an increase in the resistance value. (2) Since the ground circuit is not shared by using the pattern circuit on the front panel side, for example, the control circuit does not affect the operation of the electronic element due to the flow of static electricity into the pattern circuit. Further, there is no restriction on the design of the pattern circuit. (3) Since the ground circuit does not use the connector between the front panel and the device body, the number of pins of both connectors does not increase.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a car stereo according to an embodiment of the present invention.

FIG. 2 is a sectional view of an assembled state of a car stereo provided with an antistatic mechanism according to the embodiment.

FIG. 3 is a cross-sectional view of the car stereo body according to the embodiment and a front panel in an exploded state.

FIG. 4 is a sectional view of a front panel according to the embodiment.

FIG. 5 is a partially broken plan view of the car stereo body according to the embodiment.

FIG. 6 is a cross-sectional view of the unlocked state of the car stereo body according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Car stereo main body 2 Mounting frame 2a Engagement hole 4 Chassis 5 Front panel frame 5a Front plate 5b Window hole 6 Screw 7 Lock plate 8 Inclined surface 9 Claw 10 Lock release hole 11 Lock release key 12 Contact piece 13 Front panel 14 Front Panel 15 Front Back Panel 16 Control Board 17 Holder 20 LCD 21 LCD Holder 21a Leg 22 Ground Plate

Claims (2)

(57) [Claims] An in-vehicle device having a front panel detachably mounted on a front panel frame of a device body, a front panel having a front panel portion and a front back panel portion, and an electronic device stored in the front back panel portion. A holding member made of a conductive member for holding the element and the electronic element; a ground terminal attached to the front back panel portion and in spring contact with a leg portion of the holding member; supported by the front panel frame; is composed of a contact piece on the chassis <br/> of the main body is grounded, when the set state where the front panel is assembled to the front panel frame, generated in the electronic device and the surrounding charged Is discharged from the holding member to the chassis of the device body via the ground terminal and the contact piece, and the circuit of the electronic element is statically discharged.
An antistatic mechanism for in-vehicle equipment, which is prevented from being destroyed by electricity . 2. An antistatic device for an in-vehicle device according to claim 1.
In the structure The discharge path to the chassis of the equipment body is from the contact piece
The front panel is attached and detached by conductive connection to the contact piece.
Discharge to the chassis through the lock plate.
Antistatic mechanism of in-vehicle equipment.