JPH04345795A - Grounded circuit of operation device - Google Patents

Abstract

PURPOSE:To prevent entry of static electricity into an electric circuit which is connected to a means of operating static electricity charged on a human body by fastening an electric conductor to the metal part of the operating means and grounding the other end. CONSTITUTION:A grounding cable is fastened to a metal switch fitting frame 2B with soldering or screwing, and the other end of the cable 6 is grounded. In this way, high voltage static electricity, which enters from an operation push button 2A and coming from a human body, is discharged to the ground and prevented fom entering into any apparatus connected thereto.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding circuit for an operating device that prevents static electricity accumulated in a human body from entering an electric circuit through an operating means.

0002

2. Description of the Related Art FIG. 3 is a structural diagram showing a conventional example of an operation switch mounting structure. The operation switch 2, which serves as an operation means for sending an operation signal to an electric circuit, has an operation push button 2A for operation and a switch mounting frame 2, as shown in FIG.
B and a terminal for connecting the control wire 4,
When attaching this operation switch 2 to the molded panel 1 as an insulating attachment frame made of an insulating material, the switch attachment frame 2B described above is used. A nameplate 3 indicating the purpose and name of the operation switch 2 is attached to the mold panel 1, except for the exposed surface of the operation switch 2 that is touched by humans, that is, the operation push button 2A. The remaining part is often covered with this nameplate 3. Further, since the switch mounting frame 2B is often attached to the molded panel 1 with a spring action, a metal material is used.

0003

[Problem to be solved by the invention] By the way, the human body has 1
It may be charged with static electricity of about 10,000 volts. Therefore, when a finger touches the operation push button 2A to transmit a signal to the electric circuit connected to the other end of the control wire 4, the operation switch 2 is attached to the molded panel 1 made of an insulating material. Therefore, the static electricity from the human body has no place to escape, and the static electricity circulates through the insulation of the operation switch 2 to the terminal provided on the back surface, and enters the aforementioned electric circuit via the control wire 4. If this electric circuit includes an electronic circuit that is sensitive to voltage, such as a microcomputer, it will be destroyed by the static electricity, and the electric circuit will not be able to operate normally.

[0004] Therefore, an object of the present invention is to dissipate the static electricity that has been charged on the human body by touching the operating means attached to the mounting frame made of insulating material. The purpose is to prevent intrusion into the

[0005]

[Means for Solving the Problems] In order to achieve the above object, the grounding circuit of the present invention includes an operating means whose operating portion or mounting frame is made of a metal material, and which is mounted on a mounting frame made of an insulating material. In the operating device, one end of an electrical conductor is fixed to the metal part of the operating means with solder, metal solder, or a screw, and the other end of the electrical conductor is grounded, or
Alternatively, when the operating means is attached to the insulating mounting frame, a metal foil is sandwiched between the metal mounting frame of the operating means and the insulating mounting frame, and the other end of the metal foil is grounded.

[0006]

[Function] When the operating means is installed on a mounting frame made of insulating material, high-voltage static electricity that is charged on the human body when touching the operating means is transferred to the electric circuit through the insulation of the operating means. By connecting one end of the electrical conductor to the metal mounting frame of this operating means and grounding the other end, high-voltage static electricity can be prevented from entering the electrical circuit. The electrical conductor shall be attached to the mounting frame using solder, metal solder, or screws, or by sandwiching metal foil between the insulating mounting frame and the metal mounting frame of the operating means.

[0007]

[Embodiment] Fig. 1 is a structural diagram showing a first embodiment of the present invention. Fig. 1 shows a molded panel 1 as an insulating mounting frame, an operation switch 2, an operation push button 2A, and a metal switch. Mounting frame 2B, nameplate 3, and control wire 4
Since the name, purpose, and function of the device are the same as those of the conventional example already described in FIG. 3, a description thereof will be omitted.

In the first embodiment shown in FIG. 1, the grounding wire 5 is fixed to the metal switch mounting frame 2B by soldering or metal brazing, but of course it may also be fixed by screwing. do not have. By grounding the other end of the grounding wire 5 fixed in this way, the operation push button 2A is
The high-voltage static electricity that has entered the control wire 4 will not enter the electrical circuit connected to the control wire 4, but will be discharged to the ground.

FIG. 2 is a structural diagram showing a second embodiment of the present invention, and FIG. 2 shows a molded panel 1 as an insulating mounting frame, an operation switch 2, an operation push button 2A,
The names, uses, and functions of the metal switch mounting frame 2B, nameplate 3, and control wire 4 are the same as in the conventional example described in FIG. 3, as in the case of the first embodiment described above. The explanation of is omitted.

In the second embodiment shown in FIG. 2, when a metal switch mounting frame 2B is attached to the mold panel 1, a copper foil as a metal foil is placed between the switch mounting frame 2B and the mold panel 1. Tape 6 is sandwiched. When the other end of this copper foil tape 6 is grounded, the switch mounting frame 2B is automatically grounded, so that the high voltage static electricity that has entered from the operation push button 2A is transferred to the control wire 4, as in the case of the first embodiment described above. It will not enter the connected electrical circuit and will be discharged into the ground.

[0011]

[Effects of the Invention] According to the present invention, when an operating means is attached to a mounting frame made of an insulating material, one end of the electrical conductor is fixed to the metal switch mounting frame of the operating means and the other end is grounded. This can prevent high-voltage static electricity from the human body from entering the electric circuit connected to the operating means when the operating means is touched. The electrical conductor may be fixed to the metal switch mounting frame by soldering, metal brazing, screwing, etc., but metal foil should be used between the mounting frame and the metal switch mounting frame when attaching the operating means. By sandwiching the electrical conductors, it is possible to greatly reduce the effort required to attach the electrical conductors.

[Brief explanation of drawings]

[Fig. 1] Structural diagram showing the first embodiment of the present invention

[Fig. 2] Structural diagram showing a second embodiment of the present invention

[Figure 3] Structural diagram showing a conventional example of the mounting structure of the operation switch

[Explanation of symbols]

1 Molded panel 2 as an insulated mounting frame Operation switch 2A Operation push button 2B Switch mounting frame 3 Nameplate 4 Control wire 5 Ground wire 6 as an electrical conductor Copper foil tape as metal foil

Claims (2)

[Claims] Claim 1: An operating device in which an operating means whose operating portion or mounting frame is made of a metal material is attached to a mounting frame made of an insulating material, wherein one end of an electrical conductor is soldered to the metal part of the operating means. , a grounding circuit for an operating device, which is fixed with a metal solder or screw, and the other end of the electrical conductor is grounded. [Claim 2] In an operating device in which the operating section or the mounting frame is made of a metal material and the operating means is mounted on a mounting frame made of an insulating material, when the operating means is mounted on the insulating mounting frame, Sandwiching metal foil between the metal mounting frame and the insulating mounting frame of the operating means,
A grounding circuit for an operating device, characterized in that the other end of the metal foil is grounded.