JPH0644152Y2 - Antistatic device for operation panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an antistatic device for an operation panel such as a remote controller switch for a cooler.

[Conventional technology]

Conventionally, as this type of conventional structure, there is known one such as JP-A-63-128599.

Generally, in an operation panel such as a remote control switch, as shown in FIG. 5, an inner case 2 is arranged in a building wall which is a mounting member 1, and a metal mounting plate 3 having conductivity is attached to the inner case 2 with screws 4. Operation case 5 on the mounting plate 3, in this case the front case
An operation case 5 formed by assembling 5a and a rear case 5b with screws 5c is attached with attachment screws 6, a circuit board 7 is arranged in the operation case 5, and a wiring cord 8 connected to the circuit board 7 is provided.
Is arranged outside the operation case 5, the wiring cord 8 is routed inside the mounting member 1, and the wiring cord 8 is connected to, for example, an indoor unit (not shown) in this case.

[Problems to be solved by the device]

However, in the case of the above-mentioned conventional structure, it is difficult to surround the entire circuit board 7 in the operation case 5 without a gap, and the static electricity charged on a human finger or clothes at the time of the operation causes the attachment screw 6, the attachment plate 3, and the gap S. There is a disadvantage in that the electric charge may be moved through the electric charges and the electric discharge accompanying the electric charges may cause malfunction of the circuit board 7 or damage to the circuit elements.

[Means for Solving the Problems]

The present invention is intended to solve these disadvantages, and its gist is to dispose a mounting plate on a mounting member, mount an operation case on the mounting plate, and dispose a circuit board in the operation case. A wiring cord connected to the circuit board is provided outside the operation case, and a ground pattern connected to the wiring cord is arranged on the circuit board, and the ground pattern and the mounting plate are connected to each other. It is configured by disposing a conductive mechanism that enables electrical connection between the two, and a contact piece having conductivity can be projected on the mounting plate, and the operation case can be hooked and locked to the contact piece. A hooking hole is formed, and when the operation case is attached to the mounting plate by hooking and hooking the hooking hole on the contact piece, a conductive piece that is in elastic contact with the contact piece is arranged in the operation case, This conductive piece on the ground pattern In ESD protection device for a control panel, characterized in that in the gas connected to constitute the conductive mechanism.

[Action]

Static electricity escapes to the outside of the operation case through the mounting plate, the conductive mechanism, the ground pattern of the circuit board, and the wiring cord.

〔Example〕

1 to 4 show an embodiment in which the present invention is applied to a remote control switch for a cooler, FIGS. 1 to 3 show a first embodiment, and FIG. 4 shows a second embodiment.

The same reference numerals are used for the same mode parts as those of the conventional structure shown in FIG.

In the first embodiment shown in FIGS. 1 to 3, 9 is a conductive mechanism, in which case a conductive piece is attached to the rear case 5b of the operation case 5.
10 is attached by the heat staking portion 11, the conductive cord 12 is soldered to one end of the conductive piece 10, and the ground pattern 13 connected to the wiring cord 8 is formed on the circuit board 7.
Solder to the ground pattern 13 to form hook holes 5d on the upper left and right sides of the rear surface of the rear case 5b, and the hook holes 5d of the rear case 5b can be hooked on the upper left and right sides of the mounting plate 3 made of conductive metal. The contact piece 14 also serving as the hook locking action is integrally formed, and the front case 5a and the rear case 5b are assembled with the screw 5c, and the operation case 5 is assembled with the mounting plate 3. The conductive piece 10 is provided in contact with the mounting plate 3, and the mounting plate 3 and the ground pattern 13 can be electrically connected to each other with the operation case 5 assembled to the mounting plate 3.

An indoor unit 15 is operated by a drive circuit section c provided on the circuit board 7 by operating a remote control switch.

Since the first embodiment has the above-mentioned configuration, static electricity charged on a human finger or clothes at the time of operation is directly or via the mounting screw 6, the mounting plate 3, the conductive mechanism 9, in this case the contact piece 14,
The conductive piece 10, the conductive cord 12, the ground pattern 13 of the circuit board 7 and the wiring cord 8 positively escape to the indoor unit 15 outside the operation case 5, which causes malfunction of the circuit board 7 or damage to circuit elements due to static electricity. Can be prevented.

The second embodiment of FIG. 4 shows another structure of the conductive mechanism 9,
In this case, a convex spring portion 10a is formed on the conductive piece 10 so that the spring portion 10a directly contacts the ground pattern 13 of the circuit board 7 when the front case 5a and the rear case 5b are assembled. .

Also in the second embodiment, the mounting plate 3 and the ground pattern 13 of the circuit board 7 are electrically connected to each other, and it is possible to obtain the same effects as the first embodiment and to simplify the wiring. .

In addition, although the above-mentioned embodiment shows the example applied to the remote controller switch for the cooler, it may be applied to other operation panels.

[Effect of device]

As described above, according to the present invention, static electricity charged on a human finger or clothes during operation is actively escaped to the outside of the operation case through the mounting plate, the conductive mechanism and the wiring cord, which causes malfunction of the circuit board or circuit due to static electricity. It is possible to prevent damage to the element.

In addition, the present invention is characterized in that the mounting plate is provided with a conductive contact piece, and the operation case is formed with a hooking hole which can be hooked and locked on the contact piece, and the contact piece is hooked and locked by the hooking hole. Then, when the operation case is attached to the mounting plate, a conductive piece that comes into elastic contact with the contact piece is disposed in the operation case, and the conductive piece is electrically connected to the ground pattern to form the conductive mechanism. Therefore, when mounting the operation case on the mounting plate, the contact hole can be hooked and locked to temporarily lock the operation case, and then the screw can be used to fix the operation case. In addition to being easy, the number of mounting screws can be reduced, and when the operation case is attached, the conductive piece automatically elastically contacts this contact piece to ensure the earth contact between the mounting plate and the ground pattern. It is made.

Therefore, the contact piece not only performs such a hooking action for temporary locking and also acts as a ground connection, which makes it easy to attach the operation case and at the same time makes it extremely practical to simultaneously perform this attachment and measures against static electricity. It becomes an excellent antistatic device for operation panels.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a sectional view of the first embodiment, FIG. 2 is a partial plan view thereof, FIG. 3 is a schematic circuit diagram thereof, and FIG. 4 is a second embodiment. FIG. 5 is a partial sectional view of an example, and FIG. 5 is a sectional view of a conventional structure. 1 ... Mounting member, 3 ... Mounting plate, 5 ... Operation case, 5d
...... Catch holes, 7 ... Circuit board, 8 ... Wiring code, 9 ...
… Conductive mechanism, 10 …… Conductive piece, 13 …… Ground pattern,
14 ... contact piece.

Claims (1)

[Scope of utility model registration request] 1. A mounting plate is mounted on a mounting member, an operating case is mounted on the mounting plate, a circuit board is mounted in the operating case, and a wiring cord connected to the circuit board is mounted outside the operating case. The circuit board is provided with a ground pattern connected to the wiring cord, and a conductive mechanism is provided to electrically connect the ground pattern and the mounting plate. The mounting plate is provided with a conductive contact piece, and a hook hole is formed in the operation case so that the contact piece can be hooked and locked on the contact piece, and the hook hole is hooked on the contact piece. When the operation case is stopped and the operation case is attached to the mounting plate, a conductive piece that comes into elastic contact with the contact piece is disposed in the operation case, and the conductive piece is electrically connected to the ground pattern to provide the conductive property. An operation characterized by the construction of a mechanism Panel for static electricity countermeasure device.