CN204332771U - tact switch - Google Patents

Abstract

A kind of touch-switch, comprise the center fixed contact be arranged in base, edge fixed contact and conductive reed, elastic rubber covers in the top of base, cover plate push down elastic rubber shirt rim and and base be fastened and connected airtight, this cover plate central is provided with large through-hole, large through-hole is exposed as button in the top of elastic rubber, the strain skew wall of elastic rubber adopts fillet step shape, the inside of elastic rubber is provided with lower convex in block, this lower convex lower end by block exceed elastic rubber shirt rim lower plane and and conductive reed upper surface pressing touching cooperation, form short stroke press switch structure.Elastic rubber in the utility model slightly presses down can press conductive reed actuating switch, the stroke needed is short, reaction rapid sensitive, the strain skew wall of fillet step can abundant deformation and reply in little space, make the overall dimensions of switch compact, installation takes up room less, arranges more flexible.

Description

tact switch

Technical field: The utility model relates to a switch device, especially a light touch switch.

Background technology: Tact switches are often used on electrical appliances in automobiles and other fields. The elastic rubber parts of ordinary tact switches are usually made in the shape of a hollow cylindrical boss, which constitutes a handle and an elastically deformable wall. The elastic rubber part is deformed by pressing Press down the conductive reed to realize the switch on and off. In order to ensure reliable elastic deformation and recovery of the tact switch with this structure and have a good feel at the same time, the pressing stroke needs to be longer, and the space required for the deformation of the rubber parts is also larger, which makes the volume of the entire switch too large, which is not enough. It is compact, has many installation and application restrictions, and the press trigger response is not fast enough.

Summary of the invention: Aiming at the deficiencies of the prior art, the utility model provides a tact switch with a reasonable and compact structure.

The utility model includes a central static contact and an edge static contact arranged in the base, each static contact is respectively connected to the corresponding pin, and a conductive reed is placed in the base, the middle and center of the conductive reed The static contact is elastically opened and closed, the corners of the conductive reed and the edge of the static contact are in contact with each other, the elastic rubber part is covered above the base, the cover plate presses the skirt of the elastic rubber part and is buckled and connected to the base for airtightness. The center of the cover plate is provided with a large through hole, and the upper part of the elastic rubber part exposes the large through hole as a button. The elastically deformed inclined wall of the elastic rubber part adopts a rounded step shape. The lower end of the block exceeds the lower plane of the skirt of the elastic rubber part and presses and touches with the upper surface of the conductive reed to form a short-stroke push switch structure.

The elastic rubber part in the utility model can be pressed down slightly to turn on the switch of the conductive reed, the required stroke is short, the response is fast and sensitive, and the rounded step-shaped elastically deformed inclined wall can fully deform and recover in a small space, The overall size of the switch is compact, the installation takes up less space, and the layout is more flexible, and the cover plate and elastic rubber parts are well sealed after assembly, and are not affected by water vapor and dust, and the performance is very reliable.

Further illustrate the utility model below in conjunction with accompanying drawing and embodiment.

BRIEF DESCRIPTION OF THE DRAWINGS: Figure 1 is a schematic diagram of the main structure of the embodiment.

FIG. 2 is a schematic diagram of the conduction state of the switch in FIG. 1 .

Fig. 3 is a perspective view of the cover plate.

Figure 4 is a bottom view of the cover.

Fig. 5 is a schematic diagram of the main structure of the elastic rubber part.

Fig. 6 is a perspective view of the elastic rubber member.

Fig. 7 is a perspective view of the conductive spring.

Fig. 8 is a perspective view of the base.

Specific implementation method: as shown in Figure 1 to Figure 8, the center static contact 5 and the edge static contact 6 are arranged in the base 1, there can be two edge static contacts 6, and each static contact is respectively connected to the corresponding pin 7 conduction. A conductive reed 2 is also placed in the base 1 , the middle part of the conductive reed 2 elastically opens and closes with the central static contact 5 , and the corners of the conductive reed 2 are in contact with the edge static contacts 6 . The elastic rubber part 3 is covered above the base 1, and the cover plate 4 presses the skirt of the elastic rubber part 3 and is fastened and connected with the base 1 to be airtight. The center of the cover plate 4 is provided with a large through hole 8, and the upper part of the elastic rubber part 3 is exposed The large through hole 8 is used as a button, and the elastically deformed inclined wall 9 of the elastic rubber part 3 adopts a rounded step shape. The inside of the elastic rubber part 3 is provided with a downwardly convex pressing block 10, and the lower end of the downwardly convex pressing block 10 exceeds the bottom of the elastic rubber part 3. The lower plane of the skirt is pressed and touched with the upper surface of the conductive reed 2 to form a short-stroke push switch structure.

In this embodiment, the skirt of the elastic rubber member 3 is provided with several positioning holes 11, and the lower end surface of the cover plate 4 is provided with several positioning posts 12 for corresponding cooperation, so that the positional cooperation between the two is more accurate. On the upper end surface of the base 1 is provided with a continuous enclosing flange 13, the flange 13 and the skirt of the elastic rubber part 3 correspond to the sealing fit, so that the sealing performance is better after assembly, so that the conductive reed 2 and the center are in static contact. Point 5 and edge static contact 6 are placed in the sealed cavity inside the switch to completely prevent water and dust from entering, so as not to affect the conductivity of the switch.

Pin 7 is embedded in the base 1 by injection molding, and can be made into two forms: in-line type and SMD type. Generally, pin 7 and the corresponding static contact are an integral structure, that is, the inner end of pin 7 is used as Static contacts. In this embodiment, serrations are also provided on the surfaces of the central static contact 5 and the edge static contacts 6 to prevent single-point contact, and the electrical contact is more reliable during conduction, and the dustproof and anti-oxidation performances are also significantly improved. The conductive reed 2 can be designed into a series with different elastic forces and different coatings. By replacing the conductive reed 2, the touch operation force and contact resistance of the switch can be changed, and the adjustment is convenient.

When the switch is pressed, that is, the upper part of the elastic rubber part 3 is pressed down, the elastically deformed inclined wall 9 is elastically deformed rapidly, and the downward convex pressing block 10 of the elastic rubber part 3 is forced to press the surface of the conductive reed 2 to deform downward, and the middle part of the conductive reed 2 Quickly make contact with the central static contact 5, so that the switch is turned on to the state shown in Figure 2. After the external pressing force is removed, the elastically deformed inclined wall 9 returns elastically, the elastic rubber part 3 and the downward convex pressing block 10 are lifted up and reset, and the conductive reed 2 also rebounds under its own elastic force, leaving the center static contact 5 quickly , the switch is turned off, and returns to the initial state shown in Figure 1. During the on-off operation, the elastically deformable inclined wall 9 can fully deform and recover in a small space, and the pressing stroke of the elastic rubber member 3 is short and the response is fast.

Claims (5)

1. a touch-switch, comprise and be arranged in center fixed contact in base and edge fixed contact, each fixed contact respectively with the pin conducting of correspondence, also conductive reed is placed with in base, the middle part of this conductive reed contacts with center fixed contact elasticity opening and closing, the corner of conductive reed contacts laminating with edge fixed contact, it is characterized by: elastic rubber (3) covers in the top of base (1), cover plate (4) push down elastic rubber (3) shirt rim and and base (1) be fastened and connected airtight, this cover plate (4) center is provided with large through-hole (8), large through-hole (8) is exposed as button in the top of elastic rubber (3), the strain skew wall (9) of elastic rubber (3) adopts fillet step shape, the inside of elastic rubber (3) is provided with lower convex in block (10), this lower convex lower end by block (10) exceed elastic rubber (3) shirt rim lower plane and and conductive reed (2) upper surface pressing touching cooperation, form short stroke press switch structure.

2. touch-switch according to claim 1, is characterized by: the shirt rim of elastic rubber (3) is provided with several location hole (11), and the lower surface of cover plate (4) is then provided with several reference column (12) corresponding matching.

3. touch-switch according to claim 1 and 2, is characterized by: base (1) upper surface is provided with a chimb enclosed continuously (13), and the shirt rim correspondence of this chimb (13) and elastic rubber (3) is sealed and matched.

4. touch-switch according to claim 1 and 2, is characterized by: the surface of center fixed contact (5) and edge fixed contact (6) is provided with groove.

5. touch-switch according to claim 3, is characterized by: the surface of center fixed contact (5) and edge fixed contact (6) is provided with groove.