CN101488407B

CN101488407B - Microswitch

Info

Publication number: CN101488407B
Application number: CN200810003533XA
Authority: CN
Inventors: 郑宇志
Original assignee: Primax Electronics Ltd
Current assignee: Primax Electronics Ltd
Priority date: 2008-01-18
Filing date: 2008-01-18
Publication date: 2011-01-26
Anticipated expiration: 2028-01-18
Also published as: CN101488407A

Abstract

The invention relates to a microswitch, which comprises a pedestal, an upper cover, a sharing end, a normally open end, a normally close end, a spring plate, a pressing piece and a cushion pad arranged in the interior of the upper cover; wherein, the sharing end is arranged on one end of the pedestal; and the normally open end is arranged on the other end of the pedestal; the normally close end is arranged at one side of the normally open end; the upper cover is provided with an upper surface and a perforation and covers the pedestal; the pressing piece passes through the perforation and extends out the upper cover; one end of the spring plate is connected with the sharing end; the other end of the spring plate is provided with a salient point which contacts with the normally open end when the pressing piece is against the spring plate; the cushion plate can reduce the noise generated when the microswitch is operated.

Description

Sensitive switch

Technical field

The present invention relates to a kind of sensitive switch, relate in particular to the sensitive switch that can reduce sound.

Background technology

In informationalized epoch now, electronic equipments such as computer are universalness already, nearly all have the computer more than in the each household family, and mouse is responsible for getting in touch computer and user, its importance is unquestionable, therefore, the invention quantity of the improvement of relevant mouse apparatus or new function etc. rises especially year by year.

Be that mechanical type mouse or optical mouse all have left and right button, when the user presses the left-right key of mouse, can trigger the sensitive switch of button below and produce control instruction corresponding.Yet, when pressing traditional sensitive switch, all can produce big sound, in some cases, for example many people operate mouse in same meeting room, and the sound that this sensitive switch produced can cause user's puzzlement.

At first, the structure of sensitive switch is described, please consults Fig. 1 (a) and Fig. 1 (b) simultaneously, Fig. 1 (a) is the structure side view of traditional sensitive switch, and Fig. 1 (b) is the section of structure of traditional sensitive switch.Sensitive switch 100 comprises base 101, pressing piece 109 and loam cake 102.Loam cake 102 has a perforation 103.In addition, sensitive switch 100 also comprises following element: one shares the end that end 105 is arranged at base 101, and a Chang Kaiduan 106 is set at the other end of base 101, and is provided with a normal-closed end 104 at the side of Chang Kaiduan 106.In addition, an end of a shell fragment 107 is arranged to be shared on the end 105, and a salient point 108 of its other end then contacts with Chang Kaiduan 106 when pressing piece 109 is replaced shell fragment.And pressing piece 109 comprises button portion 110 and flange 111, and the button portion 110 of pressing piece 109 pass the perforation 103 of loam cake 102 and make the flange 111 that is positioned at around the button portion 110 and loam cake 102 perforation 103 around contact, its flange 111 skids off in 103 by boring a hole in order to prevent pressing piece 109.

The sensitive switch 100 main contact conditions that rely on shell fragment 107 and share between end 105, Chang Kaiduan 106 and the normal-closed end 104 produce switching signal.Under not stressed state, shell fragment 107 contacts with normal-closed end 104 by the salient point 108 that is positioned at its other end; When the pressing piece 109 of sensitive switch 100 is subjected to pressing, pressing piece 109 shell fragment 107 that bears down on one downwards, make the salient point 108 on the shell fragment 107 leave normal-closed end 104 and shell fragment 107 is contacted with Chang Kaiduan 106, at this moment, share end 105 and form the loop with Chang Kaiduan 106, and make sensitive switch 100 produce a Continuity signal by shell fragment 107.After pressing piece 109 suffered external force were disengaged, shell fragment 107 no longer was subjected to pressing down of pressing piece 109 and leaves Chang Kaiduan 106, and was returned to salient point 108 and normal-closed end 104 state of contact.

When pressing pressing piece 109, this pressing piece 109 moves down and compresses shell fragment 107, thereby shell fragment 107 is contacted with Chang Kaiduan 106 and forms the loop, and produces Continuity signal.And when the external force that is used for pushing pressing piece 109 disappeared, the elastic force of shell fragment 107 was with rebound position before original not stressed of pressing piece 109, and when shell fragment 107 homings, the salient point 108 on the shell fragment 107 can clash into normal-closed ends 104.Because traditional sensitive switch 100 is with salient point 108 bump normal-closed ends 104 in the process of operation, such bump can make sensitive switch produce bigger sound when operation.

From the above, need a kind of sensitive switch that reduces the wave volume that operation produces.

Summary of the invention

Purpose of the present invention is providing a kind of sensitive switch, especially a kind of sensitive switch that reduces operation sound.

In a preferred embodiment, the present invention proposes a kind of sensitive switch, comprising:

Base;

Share end, be arranged at an end of base;

Chang Kaiduan is arranged at the other end of base;

Normal-closed end is arranged at the side of Chang Kaiduan;

Loam cake has perforation, and the inside of this loam cake also comprises two fins perpendicular to the upper surface of loam cake, and loam cake is covered in base;

Pressing piece passes perforation and stretches out in loam cake;

Shell fragment, an end of shell fragment is connected with shared end, and the other end of shell fragment has salient point, and this salient point contacts with Chang Kaiduan when pressing piece is replaced shell fragment; And

Cushion pad is arranged at loam cake inside, is fixed between above-mentioned two fins;

Do not replace at this pressing piece under the situation of this shell fragment, this cushion pad contacts with this shell fragment, and described two fins do not contact with this shell fragment.

In a preferred embodiment, (Thermoplastic Rubber TPR) makes cushion pad by thermoplastic elastomer (TPE).The material of making cushion pad can be bipeltate, soft silica gel, sponge or ethylene-vinyl acetate co-polymer (Ethylene-Vinyl Acetate copolymer, EVA).

In a preferred embodiment, the flange on every side that pressing piece comprises button portion and is arranged at button portion, and flange contacts with around the perforation.

In a preferred embodiment, flange is made by vibration absorptive material.

In a preferred embodiment, vibration absorptive material comprises thermoplastic elastomer (TPE), for example rubber or silica gel.

In a preferred embodiment, share end, Chang Kaiduan, normal-closed end, shell fragment and salient point and be made of metal.

Description of drawings

Fig. 1 (a) is the structure side view of traditional sensitive switch.

Fig. 1 (b) is the section of structure of traditional sensitive switch.

Fig. 2 (a) is the structure side view of sensitive switch one preferred embodiment of the present invention.

Fig. 2 (b) is the section of structure of sensitive switch one preferred embodiment of the present invention.

Wherein, description of reference numerals is as follows:

100,200 sensitive switches, 101,201 bases

102,202 loam cakes, 103,203 perforation

104,204 normal-closed ends 105,205 are shared end

106,206 Chang Kaiduan, 107,207 shell fragments

108,208 salient points, 109,209 pressing pieces

110,210 button portions, 111,211 flanges

2031 upper surfaces, 212 fins

213 cushion pads

Embodiment

As described in above-mentioned conventional art, the bump of salient point and normal-closed end is the main source of the operation sound of sensitive switch.In order to improve the button sound that sensitive switch produces, the present invention proposes a kind of sensitive switch, can reduce the sound that is produced when sensitive switch is operated.

Find that after observing when the user uses traditional sensitive switch 100, push button, shell fragment 107 contacts with Chang Kaiduan 106 and can produce the metal bump and send the sound, decontrol button after, shell fragment 107 springs back to the position of script and contacts with normal-closed end 104 and send the sound.Therefore, in order to reduce the button sound, the sensitive switch that the present invention proposes is an overriding concern to reduce the sound that is produced between shell fragment and normal-closed end.

Please consult Fig. 2 (a) and Fig. 2 (b) simultaneously, Fig. 2 (a) is the structure side view of sensitive switch one preferred embodiment of the present invention, and Fig. 2 (b) is the section of structure of sensitive switch one preferred embodiment of the present invention.Sensitive switch 200 comprises base 201, loam cake 202 and pressing piece 209.Loam cake 202 has perforation 203, upper surface 2031 and two fins 212, and wherein two fins 212 are perpendicular to upper surface 2031, and fin 212 is positioned at the inside of loam cake 202; Pressing piece 209 passes perforation 203, makes pressing piece 209 stretch out in the upper surface 2031 of loam cake 202 and can be pressed; Two fins 212 stretch out in the surface, inside of loam cake 202, and vertical with this surface, inside and upper surface 2031.Pressing piece 209 comprises button portion 210 and flange 211, and flange 211 be arranged at button portion 210 around, button portion 210 passes the perforation 203 of loam cake 202 and stretches out in the upper surface 2031 of loam cake 202, thereby the flange 212 and the perforation 203 of loam cake 202 are contacted on every side to avoid pressing piece 209 by stretching out fully in the perforation 203.

On base 201, be provided with normal-closed end 204, share end 205, Chang Kaiduan 206 and shell fragment 207.Share the end that end 205 is arranged at base 201, Chang Kaiduan 206 is arranged at the other end of base 201, and normal-closed end 204 is positioned at the side of Chang Kaiduan 206.One end of shell fragment 207 is connected in to be shared on the end 205, and the other end of shell fragment 207 can be swung between normal-closed end 204 and Chang Kaiduan 206 along with bearing down on one downwards of pressing piece 209, salient point 208 is arranged on the shell fragment 207, near the position of Chang Kaiduan 206, thereby when shell fragment 207 swings, contact and form the loop with Chang Kaiduan 206.

Produce the sound in order to prevent shell fragment 207 from contacting with normal-closed end 204, the present invention is provided with a cushion pad 213 between two fins 212 of loam cake 202 inside, two fins 212 are in order to fixing cushion pad 213 and avoid cushion pad 213 in loam cake 202 slides within, and the thickness of cushion pad 213 is greater than the length of fin 212, contact with cushion pad 213 when shell fragment 207 is upwards swung but do not contact, shown in Fig. 2 (b) with fin 212.Wherein, cushion pad 213 is made by vibration absorptive materials such as bipeltate, soft silica gel, sponge, EVA or TPR, therefore, can not produce the sound when shell fragment 207 contacts with cushion pad 213.

In addition, when shell fragment 207 is upwards swung, for shell fragment 207 is contacted with normal-closed end 204, sensitive switch 200 of the present invention also carries out constructional change to normal-closed end 204: the present invention is with the contraction in length of normal-closed end 204, shell fragment 207 can not contacted, in its amplitude of fluctuation with normal-closed end 204 shown in Fig. 2 (b).Of particular note, when sensitive switch 200 is applied in the mousebutton field, only using shared end 205 and Chang Kaiduan 206 to carry out the work of mousebutton, is feasible and do not use normal-closed end 204, and almost not influence for the user.

In order further to reduce the operation sound that sensitive switch produced, the present invention is replaced by vibration absorptive material with the material of the flange on the pressing piece 209 211, for example: vibration absorptive materials such as rubber, silica gel and thermoplastic elastomer (TPE).And the part around the perforation 203 of the loam cake 202 that contacts with flange 211 is still made of plastic.When sensitive switch 200 work, the button portion 210 of pressing piece 209 is by the perforation 203 of loam cake 202, and flange 211 and bump around the perforation 203, because flange 211 is made by vibration absorptive material, therefore coming from described both impulsive forces of bump is absorbed by flange 211, and the vibration absorptive material of flange 211 is soft, thus the perforation 203 of hard around during by soft flange 211 bump, the acoustic absorption that flange 211 produces in the time of can be with bump and reach the effect that reduces operation sound.Wherein, the material of pressing piece 209 other parts is different with the material of flange 211, but can use extra quality emission technology (DoubleInjection) to allow pressing piece 209 produce in integrated mode.

Certainly, the material that so-called vibration absorptive material is not limited in the present embodiment specifically to be enumerated allly all belongs to category of the present invention by changing the scheme that pressing key flange or bump portion material reduce the operation sound of sensitive switch.

Preferred embodiment of the present invention is that cushion pad is fixed in loam cake inside to paste mode, and drop for fear of cushion pad, the present invention proposes another preferred embodiment, this preferred embodiment is dug a perforate in addition at loam cake, and with an end of cushion pad change into can with the shape of perforate engagement, this end plug of cushion pad is gone in the perforate, this perforated wall then has the immobilization efficiencies identical with fin again.For cushion pad directly is exposed to outside the loam cake housing, other designs a vented cap, in order to cover this perforate.Except that the set-up mode difference of cushion pad, other is all identical with the preferred embodiment of Fig. 2, therefore repeats no more.

From the above, sensitive switch of the present invention is in when operation, only can produce to come from the sound of shell fragment with the Chang Kaiduan contact, and shell fragment no longer contacts with other hardware, so no longer sends other sound.Compare with traditional sensitive switch, significantly reduced the button sound really.

The above is preferred embodiment of the present invention only, is not in order to limiting claim of the present invention, and therefore all other do not break away from the equivalence of being finished design disclosed in this invention under and change or modification, all should be contained in the application's the scope of claim.

Claims

1. sensitive switch comprises:

One base;

One shares end, is arranged at an end of this base;

One Chang Kaiduan is arranged at the other end of this base;

One normal-closed end is arranged at the side of this Chang Kaiduan;

One loam cake has a upper surface and a perforation, and the inside of this loam cake also comprises two fins, and described two fins are perpendicular to this upper surface, and this loam cake is covered on this base;

One pressing piece passes this perforation and stretches out in this loam cake;

One shell fragment, an end of this shell fragment are shared end with this and are connected, and an other end of this shell fragment has a salient point, and this salient point contacts with this Chang Kaiduan when this pressing piece is replaced this shell fragment; And

One cushion pad is arranged at an inside of this loam cake, is fixed between described two fins;

2. sensitive switch as claimed in claim 1, wherein this cushion pad is made by thermoplastic elastomer (TPE).

3. sensitive switch as claimed in claim 1, wherein this cushion pad is made by bipeltate, soft silica gel, sponge or ethylene-vinyl acetate co-polymer.

4. sensitive switch as claimed in claim 1, wherein this pressing piece comprises that a button portion and is arranged at the flange on every side of this button portion, and this flange contacts with around this perforation.

5. sensitive switch as claimed in claim 4, wherein this flange is made by vibration absorptive material.

6. sensitive switch as claimed in claim 5, wherein vibration absorptive material comprises thermoplastic elastomer (TPE).

7. sensitive switch as claimed in claim 5, wherein vibration absorptive material comprises rubber or silica gel.

8. sensitive switch as claimed in claim 1 wherein should be shared end, this Chang Kaiduan, this normal-closed end, this shell fragment and this salient point and be made of metal.