CN209104028U - a key switch - Google Patents

Abstract

The utility model discloses a waterproof key switch, comprising a base, conductive piece A and conductive piece B, Dome conductive elastic sheet and waterproof gum cover, the upper surface of pedestal is equipped with annular boss, the upper surface of pedestal is equipped with the constant head tank, conductive piece A contains the conductive contact part A who sets up at the pedestal upper surface, the conductive part A who moulds plastics in the pedestal and connect pin A on conductive part A, conductive contact part A is located the inboard of annular boss, conductive piece B contains the conductive contact part B who sets up in the constant head tank, the conductive part B and the pin B who moulds plastics in the pedestal, waterproof gum cover connects on the pedestal sealedly and holds annular boss in waterproof gum cover, be formed with sealed chamber between waterproof gum cover and the annular boss, Dome conductive elastic sheet sets up in sealed chamber, be equipped with the holding tank on the conductive contact part B; the waterproof sealing performance is good, and the holding tank can prevent that contact failure from appearing between the conductive shell fragment of Dome and the electrically conductive contact part B, reduces the malfunctioning probability of button.

Description

a key switch

【Technical field】

The utility model relates to a key switch, in particular to a key switch.

【Background technique】

With the advancement of technology, the structural design of consumer electronic products is becoming more and more complex, and consumers have increasingly stringent requirements for the use environment of electronic products, so the requirements for waterproofness are also getting higher and higher, how to reduce these as much as possible. The damage of electronic products due to exposure to a water-filled environment or inadvertent water seepage is increasingly important; in addition, the packaging process of waterproof key switches may allow dust and other fine particles to enter the sealed cavity. The buttons will also produce fine particles due to internal wear. These fine particles can cause the Dome conductive shrapnel to have poor contact with the conductive contact part, causing the button to fail.

The utility model is researched and proposed in view of the deficiencies of the prior art.

【Content of utility model】

The technical problem to be solved by the utility model is to provide a key switch, which can solve the phenomenon of key failure caused by fine particles in the waterproof key switch.

In order to solve the above-mentioned technical problems, a key switch of the present invention comprises a seat body which is injection-molded with insulating material, conductive parts A and B which are injection-molded into the seat body, Dome conductive shrapnel and waterproof rubber sleeve. The upper surface of the base body is provided with an annular boss, the upper surface of the base body is provided with a positioning groove on the inner side of the annular boss, and the conductive member A includes a conductive contact portion A set on the upper surface of the base body, an injection molded part in the base body The conductive part A and the pin A connected to the conductive part A, the conductive contact part A is located on the inner side of the annular boss, and the conductive part B comprises a conductive contact part B arranged in the positioning groove and is injected into the seat The conductive part B and the pin B connected to the conductive part B, the waterproof rubber sleeve is sealingly connected to the seat body and the annular boss is accommodated in the waterproof rubber sleeve. The waterproof rubber sleeve and the annular boss are A sealed cavity is formed between the inner side walls of the Dome, the Dome conductive elastic sheet is arranged in the sealed cavity, and the outer edge of the Dome conductive elastic sheet is in electrical contact with the conductive contact portion A. In the initial state, the Dome conductive elastic sheet is in electrical contact with the conductive contact portion B. Separation, when the waterproof rubber sleeve is pressed to make the middle of the Dome conductive shrapnel contact with the conductive contact part B, the conductive part A and the conductive part B can be connected. The accommodating groove where the elastic sheet is in poor contact with the conductive contact part B.

In the above-mentioned key switch, the conductive contact portion B is provided with two accommodating grooves, and the two accommodating grooves are perpendicular to each other.

In the above-mentioned key switch, the accommodating groove is inclined relative to the side of the base body.

In the above-mentioned key switch, the inclination angle between the accommodating groove and the side edge of the base body is °.

In the above-mentioned key switch, the waterproof rubber sleeve is provided with a protrusion for driving the Dome conductive elastic sheet to contact the conductive contact part B.

In the above-mentioned key switch, the conductive part A is provided with two pins A, and the conductive part B is provided with two pins B.

In the above-mentioned key switch, the conductive part A is connected with two conductive contact parts A, and the conductive contact part B is located between the two conductive contact parts A.

In the above-mentioned key switch, the outline of the conductive contact portion A is a crescent shape.

In the above-mentioned key switch, the sealed cavity is provided with two or three stacked Dome conductive elastic sheets.

Compared with the prior art, the utility model has the following advantages:

1. In the present invention, the conductive parts A and B are injected into the seat body, and the conductive contact part A and the conductive contact part B are sealed in the sealing cavity through the waterproof rubber sleeve, which can play a good waterproof sealing performance, and can be used for sealing. The conductive contact portion A and the conductive contact portion B are well protected, and have a simple structure and low manufacturing cost.

2. The conductive contact part B is provided with an accommodating groove for accommodating fine particles, which can prevent the phenomenon of poor contact between the Dome conductive elastic sheet and the conductive contact part B, and reduce the probability of button failure.

【Description of drawings】

The specific embodiments of the present utility model will be described in further detail below in conjunction with the accompanying drawings, wherein:

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a partial exploded view of the utility model;

Fig. 3 is the exploded view of the utility model;

Fig. 4 is the top view of the utility model;

FIG. 5 is a cross-sectional view taken along the direction A-A in FIG. 4 .

【Detailed ways】

The embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

As shown in FIG. 1 to FIG. 5 , a key switch of the present embodiment includes a base body 1 injection-molded with insulating material, conductive parts A2 and B3 injected into the base body 1 , Dome conductive elastic sheets 4 and waterproof Rubber sleeve 5, the upper surface of the seat body 1 is provided with an annular boss 11, the upper surface of the seat body 1 is provided with a positioning groove 12 on the inner side of the annular boss 11, and the conductive member A2 includes a The conductive contact portion A21 on the upper surface of the body 1, the conductive portion A22 injected into the base body 1, and the pin A23 connected to the conductive portion A22, the conductive contact portion A21 is located on the inner side of the annular boss 11, and the conductive The component B3 includes a conductive contact portion B31 disposed in the positioning groove 12, a conductive portion B32 injected into the base body 1, and a pin B33 connected to the conductive portion B32, and the waterproof rubber sleeve 5 is sealingly connected to the base body 1. The annular boss 11 is accommodated in the waterproof rubber sleeve 5 , a sealing cavity 100 is formed between the waterproof rubber sleeve 5 and the inner side wall of the annular boss 11 , and the Dome conductive elastic sheet 4 is arranged in the sealing cavity 100 , the outer edge of the Dome conductive elastic sheet 4 is in electrical contact with the conductive contact portion A21. In the initial state, the Dome conductive elastic sheet 4 is separated from the conductive contact portion B31. When the waterproof rubber sleeve 5 is pressed, the middle of the Dome conductive elastic sheet 4 is connected to the conductive contact portion. B31 contacts, the conductive parts A2 and B3 can be connected. The conductive contact part B31 is provided with a receiving groove 311 for accommodating fine particles to prevent poor contact between the Dome conductive elastic sheet 4 and the conductive contact part B31. In the utility model, the conductive parts A and B are injected into the seat body, and the conductive contact part A and the conductive contact part B are sealed in the sealing cavity through the waterproof rubber sleeve, which can achieve good waterproof sealing performance, and can provide good waterproof sealing performance. The part A and the conductive contact part B are well protected, and the structure is simple and the manufacturing cost is low; in addition, the conductive contact part B is provided with an accommodating groove for accommodating fine particles, which can prevent the conductive elastic sheet of the Dome and the conductive contact part B. The phenomenon of poor contact reduces the probability of button failure.

In order to improve the accommodating capacity of the electrical contact portion B for fine particles, the conductive contact portion B31 is provided with two accommodating grooves 311, and the two accommodating grooves 311 are perpendicular to each other.

The accommodating groove 311 is inclined relative to the side edge of the base body 1 , and preferably, the inclination angle between the accommodating groove 311 and the side edge of the base body 1 is 45°.

In order to facilitate pressing the Dome conductive elastic sheet through the waterproof rubber sleeve 5, the waterproof rubber sleeve 5 is provided with a protrusion 51 for driving the Dome conductive elastic sheet 4 to contact the conductive contact part B31. The waterproof rubber sleeve 5 is generally made of elastic and water-resistant material.

In order to make the utility model more firmly soldered on the circuit board, the conductive part A22 is provided with two pins A23, and the conductive part B32 is provided with two pins B33.

In order to improve the contact area between the conductive contact portion A21 and the Dome conductive elastic sheet, the conductive portion A22 is connected with two conductive contact portions A21, the conductive contact portion B31 is located between the two conductive contact portions A21, and the conductive The contact portion A21 has a crescent shape.

Because the Dome conductive elastic sheet is relatively thin, it is prone to lack of elasticity for a long time, so the sealed cavity 100 is provided with two or three stacked Dome conductive elastic sheets 4 .

Claims (7)

1. a kind of key switch, it is characterised in that including be molded using insulating materials pedestal (1), be moulded in pedestal (1) Interior conduct piece A (2) and conduct piece B (3), Dome electroconductive elastic sheet (4) and water-proof rubber sleeve (5), the upper surface of the pedestal (1) Equipped with annular convex platform (11), the upper surface of the pedestal (1) and be located at annular convex platform (11) inside be equipped with locating slot (12), institute The conduct piece A (2) stated includes electrically conducting contact A (21) of the setting in pedestal (1) upper surface, the conduction that is moulded in pedestal (1) Portion A (22) and the pin A (23) being connected on conductive part A (22), the electrically conducting contact A (21) are located at annular convex platform (11) inside, the conduct piece B (3) include the electrically conducting contact B (31) being arranged in locating slot (12), are moulded in pedestal (1) conductive part B (32) in the and pin B (33) being connected on conductive part B (32), the water-proof rubber sleeve (5) is hermetically It is contained in water-proof rubber sleeve (5) in connection pedestal (1) and by annular convex platform (11), the water-proof rubber sleeve (5) and annular convex platform (11) it is formed between inner sidewall seal chamber (100), the Dome electroconductive elastic sheet (4) is set in seal chamber (100), institute The outer edge and electrically conducting contact A (21) for stating Dome electroconductive elastic sheet (4) are in electrical contact, when original state, Dome electroconductive elastic sheet (4) with Electrically conducting contact B (31) separation, when pressing water-proof rubber sleeve (5) makes the middle part and electrically conducting contact B (31) of Dome electroconductive elastic sheet (4) Contact conduct piece A (2) and conduct piece B (3) can be connected, and the electrically conducting contact B (31) is equipped with tiny for accommodating Particulate matter is to prevent the holding tanks (311) of Dome electroconductive elastic sheet (4) Yu electrically conducting contact B (31) poor contact；The conduction There are two electrically conducting contact A (21), the electrically conducting contact B (31) to be located at two electrically conducting contact A for connection on portion A (22) (21) between；The electrically conducting contact A (21) is in crescent.

2. a kind of key switch according to claim 1, it is characterised in that the electrically conducting contact B (31) is equipped with two A holding tank (311), two holding tanks (311) are mutually perpendicular to.

3. a kind of key switch according to claim 2, it is characterised in that the holding tank (311) is with respect to pedestal (1) Side be obliquely installed.

4. a kind of key switch according to claim 3, it is characterised in that the holding tank (311) and pedestal (1) Inclination angle between side is 45 °.

5. a kind of key switch according to claim 1, it is characterised in that the water-proof rubber sleeve (5) is equipped with for driving The protrusion (51) that dynamic Dome electroconductive elastic sheet (4) are contacted with electrically conducting contact B (31).

6. a kind of key switch according to claim 1, it is characterised in that draw there are two being set on the conductive part A (22) There are two being set on foot A (23), the conductive part B (32) pin B (33).

7. a kind of key switch according to claim 1, it is characterised in that be equipped in the seal chamber (100) two panels or The Dome electroconductive elastic sheet (4) that three pieces are stacked.