CN113241276B

CN113241276B - Waterproof touch switch

Info

Publication number: CN113241276B
Application number: CN202110510188.4A
Authority: CN
Inventors: 戴加强; 何春林; 张鹏
Original assignee: Wenzhou Hanjing Electronics Co ltd
Current assignee: Wenzhou Hanjing Electronics Co ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2022-07-29
Anticipated expiration: 2041-05-11
Also published as: CN113241276A

Abstract

The invention discloses a waterproof light-touch switch which comprises clamping piece terminals, a base, a spring piece, a second dustproof film, a waterproof rubber pad, a first dustproof film, a button and a cover plate, wherein the clamping piece terminals, the base, the spring piece, the second dustproof film, the waterproof rubber pad, the first dustproof film, the button and the cover plate are arranged from bottom to top; the clamping piece terminals are two in number, the lower ends of the two clamping piece terminals extend out of the base to form pins, and the two pins are bilaterally symmetrical in structure. According to the waterproof tact switch designed by the invention, the first dustproof film and the second dustproof film are respectively arranged on the upper side and the lower side of the waterproof rubber pad to form a composite structure, the first dustproof film can prevent external dust from entering between the button and the waterproof rubber pad and buffer the bottom of the button, so that the damage to the waterproof rubber pad is reduced, and the service life of the tact switch is prolonged.

Description

Waterproof touch switch

Technical Field

The invention relates to a light touch switch, in particular to a waterproof light touch switch.

Background

The tact switch has advantages of small contact resistance load, accurate operation force error, diversified specifications, and the like, and is widely applied to electronic equipment, white appliances, and the like. The touch switch with the traditional structure mainly comprises a base, a button and a cover plate, wherein the cover plate is provided with a through hole, the button is matched with the through hole, and the internal structure of the touch switch is opened and closed by the elastic sheet which is elastically moved by the stress of the elastic sheet. The through-hole in the middle of the apron mainly used leads the positive button, because the button need smoothly move about, just there is obvious clearance between the through-hole in the middle of the apron and the button, causes the switch function subassembly not have airtight die cavity, leads to the product in the use with aqueous vapor or the contact of micronic dust in the air, probably became invalid at any time, can not play waterproof, dirt-proof effect to the life and the security of product can not obtain effectual guarantee.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides the waterproof light-touch switch which is stable and reliable and has good waterproof and dustproof effects.

The invention adopts the technical scheme for solving the technical problems that: a waterproof tact switch comprises clamping piece terminals, a base, a spring plate, a second dustproof film, a waterproof rubber pad, a first dustproof film, a button and a cover plate, wherein the clamping piece terminals, the base, the spring plate, the second dustproof film, the waterproof rubber pad, the first dustproof film, the button and the cover plate are arranged from bottom to top; the clamping piece terminals are two in number, the upper end of one clamping piece terminal is positioned at the middle contact in the accommodating cavity, the upper end of the other clamping piece terminal forms two side contacts on two sides of the middle contact, the lower ends of the two clamping piece terminals extend out of the base to form pins, the two pins are symmetrical in structure left and right, and a blocking groove is formed between the middle contact and the two side contacts; the elastic sheet is arranged in the accommodating cavity and positioned above the two side contacts; the second dustproof film covers the accommodating cavity and is connected with the upper end face of the base, and the bottom face of the waterproof rubber pad is connected with the second dustproof film; the button comprises a base, a pressing part extending upwards from the middle of the base and a driving part with the lower end extending out of the lower end of the base; the waterproof rubber gasket is characterized in that the cover plate is provided with a middle through hole and a positioning through hole for the guide pillar on the base to penetrate through, a first dustproof film is arranged between the cover plate and the waterproof rubber gasket, the upper end of the pressing part extends out of the middle through hole of the cover plate upwards, the guide pillar on the base penetrates into the positioning through hole of the cover plate, an edge-covering flange buckled with the base is arranged at the edge of the bottom of the cover plate, a first rectangular sealing gasket is arranged between the inner wall of the edge-covering flange and the outer wall of the base, a second rectangular sealing gasket is arranged between the bottom surface of the cover plate and the upper end face of the isolation flange, and the bottom surface of the second rectangular sealing gasket is in contact with the upper end face of the first rectangular sealing gasket.

Further perfect, install insulating gasket on the holding chamber, both sides are equipped with the protruding foot of location about insulating gasket, the positioning groove who sets up on protruding foot of location and the holding chamber both sides inner wall, the last centre bore that is equipped with of insulating gasket, the below of centre bore do middle contact, the top of centre bore are equipped with annular metal contact piece, and the both sides integrated into one piece of annular metal contact piece has elastic support bar, and elastic support bar outer end is pegged graft fixedly with the protruding foot of location, through electrically conductive gluey fixed connection between the upper surface of annular metal contact piece, elastic support bar and the shell fragment bottom surface, shell fragment bottom surface center is equipped with corrosion-resistant projection contact, and projection contact carries out unsmooth cooperation with the hole of annular metal contact piece.

Further perfection, the pin includes the rectangle pit in the outside and the rectangle arch of inboard, the bellied prominent height of rectangle is greater than the degree of depth of rectangle pit, the bellied higher authority height of rectangle is greater than the higher authority height of rectangle pit, the bellied lower level height of rectangle is located between the upper and lower limit height of rectangle pit.

Further perfection, the width of the pin is larger than the width of the middle part of the terminal of the card.

Further perfecting, first dust-proof membrane is connected with the button.

Further perfect, the shape of first dust-proof membrane is circular, and the diameter of first dust-proof membrane is more than or equal to the diameter of base, and the diameter of first dust-proof membrane is less than the diameter of shell fragment.

Further perfection, the first dustproof film and the second dustproof film are made of polyimide.

Further perfection, the elastic sheet is made of stainless steel, the single surface of the elastic sheet is covered with silver, and the silver-covered surface is the bottom surface of the elastic sheet.

Further perfection, the clamping piece terminal is made of brass with the thickness of.

Further perfected, the base, the button and the cover plate are all made of PAA plastic.

The invention has the beneficial effects that: the waterproof tact switch designed by the invention can be completely automated by machine plugging, can replace a manual plugboard of a 4-pin switch, and realizes the evolution of a mechanical arm plugboard. Raise the efficiency and reduce artificial purpose, upper and lower both sides at waterproof rubber pad are provided with first dust-proof membrane and second dust-proof membrane respectively, form composite construction, the second dust-proof membrane can prevent that external dust from getting into between button and the waterproof rubber pad, and cushion the button bottom, alleviate the damage to waterproof rubber pad, the number of times of use of waterproof rubber pad has been improved, the life-span of dabbing the switch has been prolonged, waterproof dabbing the switch is equipped with the fastener terminal of two long feet, make things convenient for the high fixing of switch on the PCB board, the function foot that can practice thrift the switch is the position of using on the PCB board, enlarge the usable area of PCB board.

Drawings

FIG. 1 is a schematic structural diagram of this embodiment 1;

FIG. 2 is an exploded view of the present example 1;

FIG. 3 is a schematic structural diagram of a base;

FIG. 4 is a schematic view of the structure of the insulating spacer and the annular metal contact piece;

description of reference numerals: 1. fastener terminal, 11, middle contact, 12, both sides contact, 13, the pin, 131, the rectangle pit, 132, the rectangle arch, 2, the base, 21, the holding chamber, 22, keep apart the flange, 23, the guide pillar, 24, block the groove, 3, the shell fragment, 25, positioning groove, 31, annular metal contact piece, 32, the elastic support strip, 4, the second dust proof membrane, 5, waterproof rubber pad, 6, first dust proof membrane, 7, the button, 71, the base, 72, press the splenium, 8, the apron, 81, middle through-hole, 82, positioning hole, 9, insulating pad, 91, the protruding foot of location, 92, the centre bore.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

referring to figures 1-3: the waterproof touch switch comprises a clamping piece terminal 1, a base 2, an elastic piece 3, a second dustproof film 4, a waterproof rubber pad 5, a first dustproof film 6, a button 7 and a cover plate 8 which are arranged from bottom to top, wherein the base 2 is recessed downwards from the upper end face to form an accommodating cavity 21, four corners of the upper end face of the base 2 extend upwards from the upper end of the accommodating cavity 21 to form an isolation flange 22, and the upper end face of the base 2 also extends upwards to form a guide pillar 23; the clamping piece terminals 1 are two in total, the upper end of one clamping piece terminal 1 is located at a middle contact 11 in the accommodating cavity 21, two side contacts 12 on two sides of the middle contact 11 are formed at the upper end of the other clamping piece terminal 1, the lower ends of the two clamping piece terminals 1 extend out of the base 2 to form pins 13, the two pins 13 are bilaterally symmetrical in structure, the two clamping piece terminals 1 are designed to gradually replace an original manual insertion plate of a four-pin switch, the evolution of a manipulator insertion plate is realized, the efficiency is improved, and the manual work is reduced, and a blocking groove 24 is formed between the middle contact 11 and the two side contacts 12; the elastic sheet 3 is arranged in the accommodating cavity 21 and is positioned above the contacts 12 at the two sides; the second dustproof film 4 covers the accommodating cavity 21 and is connected with the upper end face of the base 2, and the bottom face of the waterproof rubber pad 5 is connected with the second dustproof film 4; be provided with first dust-proof membrane 6 and second dust-proof membrane 4 respectively in waterproof rubber pad 5's upper and lower both sides, form composite construction, second dust-proof membrane 4 can prevent that external dust from getting into between button and the waterproof rubber pad, and cushion 7 bottoms of button, alleviate the damage to waterproof rubber pad 5, waterproof rubber pad 5's use number of times has been improved, the life-span of dabbing the switch has been improved, waterproof dabbing the switch and being equipped with fastener terminal 1 of two long feet, make things convenient for the high fixing of switch on the PCB board, the function foot that can practice thrift the switch is the position of using on the PCB board, enlarge the usable area of PCB board. The button 7 comprises a base 71, a pressing part 72 extending upwards from the middle of the base 71 and a driving part with the lower end extending out of the lower end of the base 71; the cover plate 8 is provided with a middle through hole 81 and a positioning through hole 82 for the guide post 23 on the base 2 to pass through, a first dustproof film 6 is arranged between the cover plate 8 and the waterproof rubber pad 5, the upper end of the pressing part 72 extends out of the middle through hole 81 of the cover plate 8, and the guide post 23 on the base 2 penetrates into the positioning through hole 82 of the cover plate 8. The edge of the bottom of the cover plate 8 is provided with an edge-covering flange 83 buckled with the base 2, on one hand, the edge-covering flange 83 can cover the concave position between the adjacent isolation flanges 22, the edges of the second dustproof film 4 and the waterproof rubber pad 5 are prevented from being directly exposed outside, the anti-aging performance can be achieved, the sealing performance of the position can be enhanced, on the other hand, the connection and the positioning of the cover plate 8 on the base 2 are more stable, when the button 7 is pressed strongly, the lower end face of the cover plate 8 is not easy to be dislocated or loosened with the upper end face of the base 2, a first rectangular sealing gasket 84 is arranged between the inner wall of the edge-covering flange 83 and the outer wall of the base 2, the connection between the edge-covering flange 83 and the base 2 can be tighter, the air tightness is stronger, a second rectangular sealing gasket 85 is arranged between the bottom face of the cover plate 8 and the upper end face of the isolation flange 22, the bottom face of the second rectangular sealing gasket 85 is contacted with the upper end face of the first rectangular sealing gasket 84, the sealing performance between the bottom surface of the cover plate 8 and the base 2 is further enhanced.

Pin 13 includes the rectangle pit 131 in the outside and the protruding 132 of inboard rectangle, the protruding height of rectangle protruding 132 is greater than the degree of depth of rectangle pit 131, the higher authority height of rectangle protruding 132 is greater than the higher authority height of rectangle pit 131, the lower level height of rectangle protruding 132 lies in between the upper and lower limit height of rectangle pit 131, and the convenient cartridge of setting up of rectangle pit 131 and rectangle protruding 132 is on the PCB, is difficult to drop from the PCB board. The cover plate 8 and the base 2 form an accommodating cavity 21, the button moves up and down in the accommodating cavity 21, and the elastic sheet 3 is pressed to conduct the middle contact 11 and the two side contacts 12, so that the on-off of circuits connected to the two ends of the two card element terminals 1 is realized.

As shown in fig. 2-3, example 2: on the basis of embodiment 1, the width of the pin 13 is larger than the width of the middle part of the card member terminal 1, and the pin is not easy to be bent. The first dustproof film 6 is connected with a button 7. The shape of the first dustproof film 6 is circular, the diameter of the first dustproof film 6 is larger than or equal to that of the base 71, the diameter of the first dustproof film 6 is smaller than that of the elastic sheet 3, the elasticity of the waterproof rubber pad 5 is not affected while the waterproof rubber pad is protected, and the using times of the waterproof rubber pad are increased. The first dustproof film 6 and the second dustproof film 4 are made of polyimide, and the composite material enhances the strength of the rubber pad. The elastic sheet 3 is made of stainless steel, the single surface of the elastic sheet is coated with silver, the silver-coated surface is the bottom surface of the elastic sheet 3, and the electric conductivity is high. The clamping piece terminal 1 is made of brass with the thickness of 0.3mm, the surface of the clamping piece terminal is plated with silver, and the clamping piece terminal is corrosion-resistant and good in conductivity. The base 2, the button 7 and the cover plate 8 are all made of PAA plastic, and the insulating property is high.

As shown in fig. 4, example 3: on the basis of example 2, install insulating gasket 9 on the holding chamber 21, both sides are equipped with location protruding foot 91 about insulating gasket 9, and the positioning groove 25 that sets up on location protruding foot 91 and the both sides inner wall of holding chamber 21, insulating gasket 9 can improve the electrical insulation performance between middle contact 11 and the both sides contact 12, support the buffering to shell fragment 3, improve elasticity, strengthen its resistance to deformation performance, be equipped with centre bore 92 on insulating gasket 9, the below of centre bore 92 is middle contact 11, and the top of centre bore 92 is equipped with annular metal contact piece 31, and the both sides integrated into one piece of annular metal contact piece 31 has elastic support bar 32, and elastic support bar 32 outer end is pegged graft fixedly with location protruding foot 91, through electrically conductive glue fixed connection between the upper surface of annular metal contact piece 31, elastic support bar 32 and the shell fragment 3 bottom surface, shell fragment 3, annular metal contact piece 31, The elastic support bar 32, the conductive glue and the insulating gasket 9 are compounded to form a three-layer elastic switch piece structure, the structure has the advantages of high strength, good elasticity, long service life and the like, a corrosion-resistant convex column contact (not shown in the attached drawing) is arranged in the center of the bottom surface of the elastic sheet 3, the convex column contact is in concave-convex fit with an inner hole of the annular metal contact piece 31, the annular metal contact piece 31 can determine the contact position between the central contact 11 and the bottom surface of the elastic sheet 3, the elastic deformation of the elastic sheet 3 is more stable, when the elastic sheet 3 is pressed, the convex column contact and the annular metal contact piece 31 are pressed into the central hole 92 and are in contact with the central contact 11, so that the switch is conducted, the thickness of the convex column contact is reduced after the corrosion and the abrasion, the annular metal contact piece 31 can form larger and more compact contact with the central contact 11, the poor contact of the switch is avoided, and the service life and the switching performance of the waterproof switch can be obviously enhanced, the switch is more sensitive.

While the invention has been shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the appended claims.

Claims

1. The utility model provides a waterproof switch that dabs which characterized by: the clamping piece structure comprises clamping piece terminals (1) arranged from bottom to top, a base (2), an elastic sheet (3), a second dustproof film (4), a waterproof rubber pad (5), a first dustproof film (6), a button (7) and a cover plate (8), wherein the base (2) is recessed downwards from the upper end face to form an accommodating cavity (21), four corners of the upper end face of the base (2) extend upwards from the upper end of the accommodating cavity (21) to form an isolation flange (22), and the upper end face of the base (2) also extends upwards to form a guide pillar (23); the number of the clamping piece terminals (1) is two, the upper end of one clamping piece terminal (1) is located at a middle contact (11) in the accommodating cavity (21), two side contacts (12) on two sides of the middle contact (11) are formed at the upper end of the other clamping piece terminal (1), the lower ends of the two clamping piece terminals (1) extend out of the base (2) to form pins (13), the two pins (13) are bilaterally symmetrical in structure, and a blocking groove (24) is formed between the middle contact (11) and the two side contacts (12); the elastic sheet (3) is arranged in the accommodating cavity (21) and is positioned above the contacts (12) at the two sides; the second dustproof film (4) covers the accommodating cavity (21) and is connected with the upper end face of the base (2), and the bottom face of the waterproof rubber pad (5) is connected with the second dustproof film (4); the button (7) comprises a base (71), a pressing part (72) extending upwards from the middle of the base (71), and a driving part with the lower end extending out of the lower end of the base (71); the cover plate (8) is provided with a middle through hole (81) and a positioning through hole (82) for a guide post (23) on the base (2) to pass through, a first dustproof film (6) is arranged between the cover plate (8) and the waterproof rubber pad (5), the upper end of the pressing part (72) extends upwards out of the middle through hole (81) of the cover plate (8), the guide post (23) on the base (2) penetrates into the positioning through hole (82) of the cover plate (8), a wrapping flange (83) buckled with the base (2) is arranged at the bottom edge of the cover plate (8), a first rectangular sealing gasket (84) is arranged between the inner wall of the wrapping flange (83) and the outer wall of the base (2), a second rectangular sealing gasket (85) is arranged between the bottom surface of the cover plate (8) and the upper end surface of the isolation flange (22), and the bottom surface of the second rectangular sealing gasket (85) is in contact with the upper end surface of the first rectangular sealing gasket (84);

An insulating gasket (9) is arranged on the accommodating cavity (21), positioning convex feet (91) are arranged on the left side and the right side of the insulating gasket (9), positioning grooves (25) are arranged on the positioning convex feet (91) and the inner walls of the two sides of the accommodating cavity (21), a center hole (92) is arranged on the insulating gasket (9), the middle contact (11) is arranged below the center hole (92), an annular metal contact piece (31) is arranged above the center hole (92), elastic support bars (32) are integrally formed on two sides of the annular metal contact piece (31), the outer ends of the elastic support bars (32) are fixedly inserted into the positioning convex feet (91), the upper surfaces of the annular metal contact piece (31) and the elastic supporting strip (32) are fixedly connected with the bottom surface of the elastic sheet (3) through conductive adhesive, a corrosion-resistant convex column contact is arranged in the center of the bottom surface of the elastic sheet (3) and is in concave-convex fit with an inner hole of the annular metal contact sheet (31);

the pin (13) comprises a rectangular pit (131) on the outer side and a rectangular bulge (132) on the inner side, the height of the bulge of the rectangular bulge (132) is greater than the depth of the rectangular pit (131), the upper height of the rectangular bulge (132) is greater than the upper height of the rectangular pit (131), and the lower height of the rectangular bulge (132) is located between the upper height and the lower height of the rectangular pit (131).

2. The waterproof tact switch according to claim 1, characterized in that: the width of the pin (13) is larger than the width of the middle part of the card terminal (1).

3. The waterproof tact switch according to claim 2, characterized in that: the first dustproof film (6) is connected with the button (7).

4. The waterproof tact switch according to claim 3, characterized in that: the shape of the first dustproof film (6) is circular, the diameter of the first dustproof film (6) is larger than or equal to that of the base (71), and the diameter of the first dustproof film (6) is smaller than that of the elastic sheet (3).

5. The waterproof tact switch according to claim 4, characterized in that: the first dustproof film (6) and the second dustproof film (4) are made of polyimide.

6. The waterproof tact switch according to claim 5, characterized in that: the elastic sheet (3) is made of stainless steel, the single surface of the elastic sheet is coated with silver, and the silver-coated surface is the bottom surface of the elastic sheet (3).

7. The waterproof tact switch according to claim 6, characterized in that: the clamping piece terminal (1) is made of brass with the thickness of 0.3, and the surface of the clamping piece terminal is plated with silver.

8. The waterproof tact switch according to claim 7, characterized in that: the base (2), the button (7) and the cover plate (8) are all made of PAA plastic.