JPH0579828U - Antistatic structure of switch device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an antistatic structure in which the shape of the switch device does not become large and the structure is not complicated. In a switch device in which a switch 14 provided on a substrate 10 is turned on by pressing a key top 54, a support 52 integrally formed on the key top 54 via hinge parts 56 and 56 is provided. The substrate 1 is provided on the substrate 10.
The upper pattern 50 which contacts the support 52 is formed on the upper surface of the main body 0, and the support 52, the hinge portions 56 and 56 and the key top 54 which are integrally formed are formed of a conductive material, and the key top 54 is formed. Since the charged static electricity is forcibly guided to the aspert pattern 50 through the hinge portions 56 and 56 and the support 52, the creepage distance can be reduced and the structure can be simplified. An insulating pressing body 58 is inserted between the key top 54 and the pressing portion 22 of the switch 14 to prevent the switch 14 from being adversely affected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in an antistatic structure of a switch device in which a switch on a substrate is turned on by pressing a keytop (for example, a hinge type keytop).

[0002]

[Prior Art]

 Conventionally, the static electricity prevention structure of this type of switch device has been configured as shown in FIGS. 3 to 5 or as shown in FIG. That is, in the hinge type switch device shown in FIG. 3 to FIG. 5, the insulating support 12 and the switches 14, ... Are fixed on the printed circuit board 10, and the support 12 is provided with the hinge portions 16, 16 ,. The key tops 18, ... Are integrally formed, and the pressing portions 20, protruding from the lower surface side of the key tops 18, ... Are pressed by the pressing portions (for example, the key stem) 22 of the switches 14 ,. The switch 14 is turned on by pressing the upper surfaces of the key tops 18, ... To turn on the switches 14 ,. -The creepage distance to the pattern was increased to prevent the electrostatic components from being adversely affected by static electricity (that is, static electricity was prevented). 3 and 4, 24 is a panel and 26 is a display sheet.

In the switch device shown in FIG. 6 (for example, the actual opening 57-69121), the switches 32, ... Are provided on the upper surface of the printed board 30 and the upper pattern 34 is formed on the lower surface thereof. Is formed on the lower portion of the key top 36, ..., and a conductive sponge 42 is mounted between the collar body 38, ... And the inner surface of the switch box 40. Is connected to the apart pattern 34 through the conductors 44 and 46, the electrostatic charge charged on the key tops 36, ... Is forcibly guided to the apart pattern 34, and electronic parts due to static electricity are connected. I tried to prevent the bad influence on. Reference numeral 48 indicates a display sheet.

[0004]

However, in the conventional example shown in FIGS. 3 to 5, the creepage distance is increased to prevent the adverse effect of static electricity on electronic components. There was a problem that it would grow. Further, in the conventional example shown in FIG. 6, since the conductive sponge 42 and the conductors 44 and 46 must be provided, there is a problem that the structure becomes complicated. The present invention has been made in view of the above problems, and an object of the present invention is to provide an antistatic structure for a switch device that does not become large in size and does not complicate the structure.

[0005]

[Means for Solving the Problems]

 The static electricity prevention structure of the switch device according to the present invention is a switch device in which a switch provided on a substrate is turned on by pressing a key top, and a support integrally formed on the key top via a hinge portion. A body is provided on the substrate, an upper pattern is formed on the substrate to contact the support, and the integrally formed support, hinge and key top are made of a conductive material. It is characterized in that an insulating pressing body is inserted between the key top and the pressing portion of the switch.

[0006]

[Action]

 When static electricity is charged on the keyboard due to contact with the operator, this static electricity is forcibly applied to the substrate's upper pattern through the hinge part and the support formed integrally with the keyboard. Be guided. Since an insulating pressure body is provided between the key top and the pressing portion of the switch, static electricity charged on the key top does not adversely affect the switch.

[0007]

【Example】

 FIG. 1 shows an embodiment of an antistatic structure for a switch device according to the present invention. In this figure, the same parts as those in FIGS. 3 to 5 are designated by the same reference numerals. In FIG. 1, reference numeral 10 is a printed circuit board, on which a circuit pattern (not shown) and an upper pattern 50 are formed, and switches 14 ,. Provided on the printed circuit board 10 is a support body 52 having a shape substantially the same as that of the support body 12 and made of a conductive material (for example, a conductive resin) different from that of the support body 12. The lower surface of the support body 52 is in electrical contact with the upper surface of the above-mentioned astern 50.

Reference numerals 54, ... Are key tops, and these key tops 54, ... Are integrally formed on the support body 52 via hinge portions 56, 56 ,. That is, the key tops 54, ... Hinge portions 56 and 56, ... And the support body 52 are integrally formed of a conductive material (for example, a conductive resin). A pressing body 58 made of an insulating material (for example, insulating resin) is inserted between the key top 54 and the pressing portion 22 of the switch 14. An upper portion of the pressing body 58 is formed in a thick rectangular plate shape and is fitted in a recess formed in a lower surface side of the key top 54, and a lower portion thereof is formed in a square bar shape so that the switch 14 has a rectangular shape. It is in contact with the upper surface of the pressing portion 22.

Reference numeral 24 denotes a panel attached to the upper end surface of the support body 52. The panel 24 is formed with through holes 60, through which the key tops 54 ,. ing. A display sheet 26 is attached to the upper surface of the panel 24.

Next, the operation of the above embodiment will be described. When the operator touches the key top 54 and the key top 54 is charged with static electricity, the static charge is applied to the hinge portions 56 and 56 integrally formed on the conductive key top 54 and the support 52. Is forcibly guided to the upper pattern 50 of the substrate 10 via. Since the insulating pressing body 58 is provided between the key top 54 and the pressing portion 22 of the switch 14, the static electricity charged on the key top 54 does not adversely affect the switch 14.

In the above-mentioned embodiment, the surface pattern formed on the substrate is formed so as to come into contact with all of the lower surface of the support, but the present invention is not limited to this, and at least the lower surface of the support is formed. It suffices that a part of the metal contacts the aspert pattern on the substrate and the electrostatic charge on the keytop is guided to the aspert pattern through the hinge and the support. For example, as shown in FIG. 2, a part of the lower surface of the support body 52a is brought into contact with the aspert pattern 50 on the printed circuit board 10, and the other part of the lower surface of the support body 52 and the print substrate 10 are connected. Insulators 62, ... May be inserted between them.

[0012]

[Effect of the device]

 As described above, the static electricity prevention structure of the switch device according to the present invention is provided with the support integrally formed on the key top through the hinge portion on the substrate, and the contact pattern which contacts the support on the substrate. And the integrally formed support, hinge and key top are made of a conductive material, and static electricity charged on the key top is forcibly forced through the hinge and support. Since it is led to the negative side, the shape can be made smaller compared to the conventional example in which the creepage distance is increased to prevent static electricity, and a conductive sponge or conductor is provided to prevent static electricity. The structure can be simplified compared to the conventional example. Further, since the insulating pressing body is inserted between the key top and the pressing portion of the switch, static electricity charged on the key top does not adversely affect the switch.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of an antistatic structure for a switch device according to the present invention.

FIG. 2 is a cross-sectional view of an essential part showing another embodiment of the present invention.

3 shows a first conventional example, and is a partial cross-sectional view taken along the line AA of FIG.

FIG. 4 shows a first conventional example and is a partial cross-sectional view taken along the line BB of FIG.

FIG. 5 is a partial plan view showing a first conventional example and omitting display of a substrate, a panel and a display sheet.

FIG. 6 is a partial cross-sectional view showing a second conventional example.

[Explanation of symbols]

 10 ... Printed circuit board 14 ... Switch 50 ... Aspart turn 52, 52a ... Support 54 ... Key top 56 ... Hinge part 58 ... Pressing body 62 ... Insulator

Claims (2)

[Scope of utility model registration request] 1. A switch device in which a switch provided on a substrate is turned on by pressing a key top,
A support body integrally formed on the key top via a hinge portion is provided on the substrate, and an upper pattern is formed on the substrate to contact the support body, and the support body is integrally formed, An antistatic structure for a switch device, characterized in that the hinge part and the key top are made of a conductive material, and an insulating pressing body is inserted between the key top and the pressing part of the switch. 2. The antistatic structure for a switch device according to claim 1, wherein the aspert pattern formed on the substrate is in contact with the entire lower surface of the support.