JPH0628955U - Pushbutton switch structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent contact failure, improve the click feeling during push button operation, and improve the assembly workability. [Construction] Contact patterns 3, 3 are formed on a substrate 2, and a conductive rubber switch 5 is placed on the substrate 2 so as to cover the contact pattern 3. Conductive rubber switch 5
Is provided with an elastic leg portion 7, and a contact portion 8 that electrically closes the contact patterns 3 and 3 is provided on the ceiling portion of the leg portion 7.
Is provided. The push button 10 is slidably supported in the hole 1a of the case 1 and presses the conductive rubber switch 5 to bring the contact portion 8 into contact with the contact patterns 3 and 3. Then, the conductive rubber switch 5 is formed with a cylindrical portion 6, and the push button 10
A cylindrical boss 13 that is press-fitted into the cylindrical portion 6 is projectingly provided on the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure of a push button switch which is adopted as various electric switches and electrically presses a push button to bring a contact portion of a conductive rubber switch into contact with a contact pattern of a substrate to electrically close the contact pattern. .

[0002]

[Prior art]

 FIG. 4 is a side sectional view showing the structure of a conventional push button switch. In the figure, reference numeral 1 is a case, which has a cylindrical hole 1a and is covered with the substrate 2. A pair of contact patterns 3a and 3b are formed close to each other on the substrate 2, and a conductive rubber switch 25 is mounted on the substrate 2 so as to cover these contact patterns 3a and 3b. The conductive rubber switch 25 is entirely made of rubber, and has an elastic leg portion 7 formed in a thin shape in a substantially inverted U shape, and a columnar portion 26 integrally formed on the upper surface of the leg portion 7. It is composed of. On the ceiling portion of the leg portion 7, a contact portion 8 is provided so as to face the contact patterns 3a and 3b.

Reference numeral 30 denotes a push button, which has a flange-shaped flange portion 12 provided on the bottom edge of the cylindrical operation portion 11, and a blind hole 31 formed in the center of the bottom surface. In the push button 30, the hole 31 is capped on the columnar portion 26 of the conductive rubber switch 25, and the operating portion 11 is loosely fitted into the hole 1 a of the case 1 so that the head portion of the operating portion 11 projects outward from the case 1. And is slidably supported in the hole 1a in the vertical direction in the figure. In such a configuration, when the head portion of the operation portion 11 is pressed downward, the leg portion 7 of the conductive rubber switch 25 bends, the contact portion 7 contacts both of the contact patterns 3a and 3b, and the contact pattern 3a. 3b is electrically closed.

[0004]

[Problems to be solved by the device]

 In the structure of the conventional push button switch described above, since the connecting portion of the conductive rubber switch 25 with the push button 30 is formed by the rubber columnar portion 26, as shown in FIG. 5, the case 1 and the substrate 2 are assembled at the time of assembly. When and shift by δ, the cylindrical portion 26 deforms in the horizontal direction in the figure. If the push button 30 is pressed in this state, the vertical pressing force is not accurately transmitted to the leg portion 8, so that there is a problem that the contact portion 8 does not accurately contact the contact patterns 3a and 3b and a contact failure occurs. there were. Further, since the columnar portion 26 is deformed and tilted, the operation pressing force of the push button 30 is lost and is transmitted to the conductive rubber switch 25, so that there is a drawback that the click feeling is deteriorated.

Further, in order to transmit the pressing operation of the push button 30 to the contact portion 8 through the rubber-made cylindrical portion 26, the cylindrical portion 26 is compressed and deformed in the vertical direction in the drawing during the pressing operation of the push button 30, As shown in 6, there is a problem that the displacement amount 1 of the conductive rubber switch 25 becomes small with respect to the stroke amount L of the push button 30, and the contact portion 8 does not contact the contact patterns 3a and 3b, resulting in contact failure. It was Further, there is a drawback that the click feeling is reduced due to the compression deformation of the columnar portion 26.

Further, the push button 30 and the conductive rubber switch 25 are individually dropped into the case 1 at the time of assembling, which makes the work complicated. In order to improve this, as shown in FIG. 7, the column portion 26 of the conductive rubber switch 25 is press-fitted into the hole 31 of the push button 30 and preassembled, so that the push button 30 and the conductive rubber switch 25 are simultaneously cased. There is a method of incorporating into 1. However, in the conventional structure, as shown in (b) of the figure at the time of press-fitting, the compressive force generated in the columnar part 26 deforms in the direction in which the outer diameter of the columnar part 26 expands, so press-fitting work becomes impossible. However, there is an inconvenience that the above method that facilitates the assembly work cannot be adopted.

Therefore, the present invention has been made in consideration of the above-mentioned conventional drawbacks, problems, or inconveniences, and the purpose thereof is to prevent contact failure and to prevent a click feeling during push button operation. An object of the present invention is to provide a push button switch structure which is improved and the assembly workability is improved.

[0008]

In order to achieve this object, the structure of the push button switch according to the present invention is such that a columnar boss is formed on the bottom surface of the push button that presses the conductive rubber switch and the contact pattern of the substrate is formed. A cylindrical part for press-fitting a boss into a conductive rubber switch having a contact part corresponding to is formed.

[0009]

[Action]

 According to the present invention, the pressing force when the push button is pressed is transmitted to the conductive rubber switch by the boss of the push button that is hardly deformed by the pressing force.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of the structure of a push button switch according to the present invention, and FIG. 2 is an enlarged side sectional view of the same. In these figures, the same components as those in the conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted. A feature of the present invention is that a thin-walled cylindrical portion 6 is provided on an upper surface of a leg portion 7 constituting a conductive rubber switch 5, and the cylindrical portion 6 is press-fitted in the center of a bottom surface of an operating portion 11 constituting a push button 10. The point is that a cylindrical boss 13 is provided.

With such a configuration, even if the case 1 and the substrate 2 are displaced and the positional relationship between the push button 10 and the conductive rubber switch 5 is displaced, the button 13 of the push button 10 is displaced. Does not deform in the horizontal direction in the figure, the boss 13 can reliably press the leg portion 7 of the conductive rubber switch 5, and the contact portion 8 and the contact patterns 3a, 3b can be reliably contacted. It is possible to prevent the occurrence of contact failure between the contact portion 8 and the contact patterns 3a and 3b, and improve the click feeling of the push button 10.

Further, since the boss 13 is not deformed in the pressing direction of the push button 10, the stroke amount of the push button 10 and the displacement amount of the conductive rubber switch 5 are the same, which also results in the contact portion 8 and the contact pattern. The contact with the contact points 3a and 3b is surely performed, contact failure between the contact point 8 and the contact patterns 3a and 3b can be prevented, and the click feeling of the push button 10 can be improved.

Further, in order to improve the assembling work, the cylindrical portion 6 can be easily press-fitted into the boss 13 even when the conductive rubber switch 5 is assembled to the push button 10 in advance. It is possible to improve the assembly workability.

FIG. 3 is an enlarged side sectional view of an essential part of the second embodiment of the present invention. In the second embodiment, a small hole 6a is formed on the bottom surface of the cylindrical portion 6 of the conductive rubber switch 5, and a dowel 13a fitted into the small hole 6a is projected on the bottom surface of the boss 10 of the push button 10. It was formed. With such a configuration, the tip of the dowel 13a comes into direct contact with the contact portion 8, and when the push button 10 is pressed, the dowel 13a is used when the contact portion 8 comes into contact with the contact patterns 3a, 3b. Since the contact portion 8 is pressed toward the contact patterns 3a and 3b, more reliable contact operation can be obtained.

In this embodiment, the boss portion 13 is formed in a cylindrical shape. However, the present invention is not limited to this, and may be formed in a prismatic shape. It goes without saying that the design of the portion 6 can be changed in various ways according to the shape of the boss portion 13.

[0016]

[Effect of device]

 As described above, according to the present invention, a conductive rubber switch having a contact portion corresponding to the contact pattern is placed on the substrate on which the contact pattern is formed, and the conductive rubber switch is pressed to move the contact portion to the contact pattern. A push button that electrically contacts the contact pattern to electrically close the contact pattern, and the conductive rubber switch is provided with elastic legs that separate the contact part from the contact pattern against the pressing operation of the push button. Since the boss is formed to protrude and the cylindrical portion for press-fitting this boss is formed in the conductive rubber switch, even if there is a displacement between the conductive rubber switch and the push button, the boss of the push button Since there is no deformation, the boss securely presses the conductive rubber switch leg to ensure contact between the contact part and the contact pattern to prevent contact failure and improve the click feeling. Rukoto can.

Further, since the boss of the push button is not deformed in the pushing direction of the push button, the pressing stroke of the push button and the displacement amount of the conductive rubber switch match, so that the contact portion and the contact pattern are reliably contacted. As a result, contact failure can be prevented and the click feeling can be improved. Further, since the tube portion of the conductive rubber switch can be easily press-fitted into the boss of the push button, it is possible to assemble the push button and the conductive rubber switch in advance. Assembly can be improved.

[Brief description of drawings]

FIG. 1 is a side sectional view of the structure of a push button switch according to the present invention.

FIG. 2 is an enlarged side sectional view of a main part of the structure of the push button switch according to the present invention.

FIG. 3 is a side sectional view showing a second embodiment of the structure of the push button switch according to the present invention.

FIG. 4 is a side sectional view of the structure of a conventional push button switch.

FIG. 5 is a side sectional view showing the operation of the structure of a conventional push button switch.

FIG. 6 is a side sectional view showing the operation of the structure of a conventional push button switch.

7A and 7B show an assembling operation in a structure of a conventional push button switch, FIG. 7A is a side sectional view during assembly, and FIG. 7B is a main portion side sectional view showing deformation of a columnar portion by press fitting.

[Explanation of symbols]

 2 board 3a contact pattern 3b contact pattern 5 conductive rubber switch 6 cylindrical part 7 leg part 8 contact part 10 push button 13 boss

Claims (1)

[Scope of utility model registration request] 1. A substrate on which a contact pattern is formed, a conductive rubber switch mounted on the substrate and having a contact portion corresponding to the contact pattern, and the conductive rubber switch is pressed to contact the contact pattern. A push button switch for electrically closing the contact pattern by contacting the contact pattern with the conductive rubber switch, the leg section having elasticity to separate the contact part from the contact pattern against the pressing operation of the push button. In the above structure, a columnar boss is formed so as to project from the bottom surface of the push button, and a cylindrical portion for press-fitting the boss is formed in the conductive rubber switch.