JP2008171789A - Microswitch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microswitch composed of a base, an upper cover, a common terminal, an N. C. terminal, an N. O. terminal, a spring and a pushing member. <P>SOLUTION: The upper cover has a through-hole and an impact portion and the pushing member contains a keyboard portion and a crown. The keyboard penetrates the through-hole of the upper cover and the crown and the impact portion contact with each other and the impact portion or the crown of the pushing member is made of a vibration-absorbing material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a microswitch, and more particularly to a microswitch with reduced noise.

  In today's information era, electronic equipment such as personal computers has finally become widespread, and most households have one or more personal computers. There is no way. For this reason, in recent years, the number of inventions related to improvements in mouse devices has been increasing year by year.

  Regardless of whether the mouse is a mechanical mouse or an optical mouse, both have left and right keys, and when the user presses the left and right keys of the mouse, the micro switch below the keys is triggered to issue a corresponding command. However, when a conventional micro switch is pressed, a large amount of noise is generated. In such a situation, for example, when a large number of people operate a mouse in a conference room, the noise generated by the micro switch causes inconvenience to the user. For this reason, a low-noise microswitch is required.

  An object of the present invention is to provide a microswitch, particularly a microswitch with reduced operation noise.

  In a preferred embodiment, the present invention presents a microswitch having the following characteristics. The microswitch includes a pedestal, an upper lid made up of a through hole and an impact portion, a common end that is installed at one end of the pedestal and has a convex point, an N.O end that is installed at the other end of the pedestal, and an N.O end side. N.C end installed at the end, and a spring connecting one end to the convex point and the other end connected to the N.C end, and further including a pressing member consisting of a keyboard and a comb installed around the keyboard. Of these, the keyboard part passes through the through hole of the upper lid to bring the cam and the impact part into contact with each other, and the impact part or the keyboard part is made of a vibration absorbing material.

  In the preferred embodiment, the common end, N.O end, and N.C end are made of metal.

  In a preferred embodiment, the vibration absorbing material includes rubber, silicon rubber and thermoplastic rubber (TPR).

As described in the above prior art, in order to improve the key noise generated by the microswitch, the present invention presents a microswitch that can suppress noise generated when the microswitch is operated.

  First, the structure of the microswitch will be described. FIG. 1 is a side view of the structure of a conventional microswitch. The micro switch 100 includes a pedestal 101, a pushing member 110, and an upper lid 102. The upper lid 102 has a through hole 103. In addition, the microswitch 100 further includes the following members. The common end 105 is installed at one end of the pedestal 101, and a convex point 106 is provided on the common end 105. The N.O end 107 is installed at the other end of the base 101, and the N.C end 108 is provided at the side end of the N.O end 107. In addition, one end of the spring 109 and the convex point 106 of the common end 105 are in contact with each other, and the other end is in contact with the N.C end 108. The pressing member 110 includes a keyboard portion 111 and a cam 112, and the keyboard portion 111 of the pressing member 110 passes through the through-hole 103 of the upper lid 102 and contacts the cam 112 around the keyboard portion 111 and the impact portion 104 of the upper lid 102. Let Of these, the cam 112 serves to prevent the pushing member 110 from sliding out of the through hole 103.

  The micro switch 100 generates a switch signal mainly depending on the contact state between the spring 109 and the common end 105, the N.O end 107 and the N.C end 108. One end of the spring 109 is in contact with the convex point 106 on the common end 105, and the other end of the spring 109 and the N.C end 108 are in contact with each other in a state where no force is applied (the spring 109 shown by the solid line in FIG. 1). Then, a circuit is formed and a prohibition signal is issued to the micro switch 100. When the push member 110 of the micro switch 100 is pushed down, the push member 110 pushes down the spring 109 and moves the spring 109 away from the N.C end 108 to contact the N.O end 107 (the spring indicated by the dotted line in FIG. 1). 109), at this time, the common end 105 forms a circuit with the N.O end 107 through the spring 109, and issues an ON signal to the micro switch 100. When the external force received by the pressing member 110 is released, the spring 109 is no longer pressed by the pressing member 110 and is separated from the N.O end 107 and returns to the contact state with the N.C end 108.

  When the pressing member 110 is pressed, the pressing member 110 moves downward to press the spring 109, and one end of the spring 109 comes into contact with the N.O end 107 to form a circuit and generates an ON signal. When the external force holding the pushing member 110 disappears, the elasticity of the spring 109 returns to the position before the pushing member 110 receives the force, and when the pushing member 110 returns to its original shape, the cam 112 of the pushing member 110 is the impact portion of the upper lid. Hits 104. Since the upper lid 102 and the pressing member 110 of the conventional microswitch 100 are both made of hard plastic, the inventor has a large size when the cam 112 of the pressing member 110 and the impact portion 104 of the upper lid 102 abut each other. It was discovered that noise occurred and this was the main cause of operational noise of the microswitch 100.

  FIGS. 2a and 2b are schematic views showing the top cover and the base of the microswitch of the present invention separated from each other. The micro switch 200 includes a pedestal 201, an upper lid 202, and a pressing member 210, and a common end 205, an N.O end 207, an N.C end 208 and a spring 209 are attached on the pedestal 201. The upper lid 202 has a through hole 203, and two short edges around the through hole 203 serve as an impact portion 204. In the microswitch 200 of the present invention, the common end 205 is installed at one end of the pedestal 201, and the common end 205 has a convex point 206. The N.O end 207 is installed at the other end of the base 201, and the N.C end 208 is located at the side end of the N.O end 207. One end of the spring 209 is connected to the convex point 206 of the common end 205, and the other end is in contact with the N.C end 208. The pressing member 210 includes a keyboard portion 211 and a cam 212, and the cam 212 is disposed around the keyboard portion 211, and the keyboard portion 211 passes through the through hole 203 of the upper lid 202 and passes the cam 212 to the impact portion 204 of the upper lid 202. The keyboard portion 211 is in contact with the spring 209.

  The common end 205, the N.O end 207, the N.C end 208, and the spring 209 form a circuit so that the microswitch 200 operates normally. Since the operation principle of the microswitch 200 of the present invention is the same as that of the prior art, it will not be described in detail.

  Based on the above-described analysis of the operation noise of the microswitch, the present invention absorbs the material of the cam 212 on the impact portion 204 or the pushing member 210 in order to suppress the noise generated when operating the microswitch. The material is replaced.

In a preferred embodiment, the impact portion 204 is made of a vibration absorbing material such as rubber, silicon rubber, or thermoplastic elastomer (TPR), and other parts are parts other than the impact portion 204 of the upper lid 202 and The material of the entire pressing member 210 is made of plastic without changing. As shown in FIG. 3, when the micro switch 200 is operated, the keyboard portion 211 of the pressing member 210 passes through the through hole 203 of the upper lid 202, and the cam 212 comes into contact with and impacts the impact portion 204. Since the impact part 204 is made of a vibration absorbing material, the impact force due to the collision between the two is absorbed by the impact part 204, and since the vibration absorbing material of the impact part 204 is soft, the hard cam 212 is soft. When it hits the impact portion 204, the impact portion 204 absorbs the sound at the time of hitting and has the effect of suppressing operation noise. Further, although the material of the upper lid 202 and other parts is different from that of the impact portion 204, the upper lid 202 can be manufactured by an integral molding method using a double injection technique.

  In another preferred embodiment, the present invention makes the cam 212 of the pushing member 210 of a vibration absorbing material. Thus, when the cam 212 collides with the impact part 204, the vibration absorption capability of the cam 212 itself of the pushing member 210 can suppress noise generated when the microswitch 200 is operated. Although the materials of the keyboard portion 211 and the cam 212 of the pressing member 210 are different, the pressing member 210 can be manufactured by integral molding using a double injection technique. The so-called vibration absorbing material is not limited to the materials specifically listed in the present embodiment, and any material that suppresses the operation noise of the microswitch by changing the material of the push member, the cam or the impact portion belongs to the category of the present invention. The above description is only a preferred embodiment of the present invention, and does not limit the scope of the patent application of the present invention, and all equivalent modifications or corrections completed within the scope not departing from the spirit disclosed in the present invention It shall be included in the scope of patent application.

It is a structure side view of the conventional microswitch. a and b are schematic views in which the upper lid and the base of the microswitch of the present invention are separated. It is a cross-sectional schematic diagram of the microswitch of the present invention.

Explanation of symbols

100, 200 Micro switch 102, 202 Upper lid 104, 204 Impact portion 106, 206 Convex point 108, 208 NC end 110, 210 Push member 112, 212 Comb 101, 201 Pedestal 103, 203 Through hole 105, 205 Common end 107, 207 NO end 109, 209 Spring 111, 211 Keyboard

Claims (3)

A pedestal,
An upper lid composed of a through hole and an impact portion;
A common end installed at one end of the pedestal and having a convex point;
NO end installed at the other end of the pedestal,
NC end installed on one side end of the NO end;
One end connected to the convex point and the other end connected to the NC end,
It consists of a keyboard part and a cam installed around the keyboard part, the keyboard part penetrating through the through hole of the upper lid, and includes a pushing member in contact with the cam and the impact part,
The microswitch according to claim 1, wherein the impact part or the comb of the keyboard part is made of a vibration absorbing material.   2. The microswitch according to claim 1, wherein the common end, the N.O end, and the N.C end are made of metal.   The microswitch according to claim 1, wherein the vibration absorbing material includes rubber, silicon rubber, and a thermoplastic elastic body.

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