Thin film touch switch structure
By setting tear joints and raised structures in the thin film touch switch structure, the rosin penetration path is extended and its solidification is blocked, the problem of rosin insulation during welding is solved, and the thinner design of the switch is realized.
Patent Information
- Application Number
- CN202422261607.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-14
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-14
AI Technical Summary
During the welding process of existing light-touch switches, the contact point insulating due to rosin penetration affects the conduction performance, and in order to prevent penetration, it is difficult to achieve thinness and thinness.
A thin film light-touch switch structure is designed to extend the rosin penetration path by setting tear joints and raised structures on the conductive sheet and pins, and block the rosin during welding, ensuring that the conductive sheet cools and solidifies in a limited space.
Effectively prevent rosin insulation, ensure the conduction performance of the switch, and at the same time make the total length of the switch smaller and the volume smaller, achieving a thinner design.
Smart Images
Figure CN223079014U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of switch structures, and particularly relates to a thin film tactile switch structure. Background Art
[0002] A tactile switch is a switch structure that makes the circuit connected by lightly pressing a shrapnel. It is thin, light, and miniaturized, and is often used in electronic products such as digital 3C, AR / VR, instruments, cameras, and wearable devices.
[0003] The pins of the tactile switch are welded by applying solder paste. The solder paste contains a flux. After the flux passes through the high temperature of the furnace, a gas (rosin) will be generated, and an insulating viscous body will be formed after cooling; when the rosin passes through the furnace during the product welding, due to thermal expansion and contraction, a gap will be formed between the base and the metal surface, and the rosin will penetrate along the gap on the metal surface. If it penetrates to the switch contact point of the product, it will affect the switch conduction performance. The straight-line distance between the contact point and the pin of the existing tactile switch is the penetration path of the rosin. The penetration path of the rosin is short. Therefore, before the rosin reaches the switch contact point, the rosin has not cooled and solidified yet. Therefore, the rosin penetrates to the position of the contact point to form an insulating layer, causing the switch to fail. Therefore, in the design of the existing tactile switch, in order to extend the rosin penetration path and make the rosin solidify before contacting the contact point, it is necessary to increase the width of the switch, resulting in an increase in the volume of the product and making it difficult to achieve thinner and lighter. Summary of the Utility Model
[0004] The purpose of the utility model is to provide a thin film tactile switch structure aiming at the defects and deficiencies of the prior art.
[0005] To achieve the above purpose, the technical solution adopted by the utility model is:
[0006] A thin film tactile switch structure described in the utility model includes a base with an open top surface; a first conductive sheet and a second conductive sheet are arranged in the inner cavity of the base; at least one conductive shrapnel is arranged in the inner cavity of the base; a film is arranged on the top end surface of the base to seal the top end surface of the base; a glue dot is arranged between the film and the conductive shrapnel; both the first conductive sheet and the second conductive sheet penetrate through the left and right sides of the base; the conductive shrapnel is arranged between the glue dot and the second conductive sheet;
[0007] The first conductive sheet is provided with a first conductive part and two first pins; the first conductive part is arranged in the inner cavity of the base; the end of the first pin extends out of the base; a first tearing seam is arranged on the first conductive sheet; the first pin and the first conductive part are respectively arranged on both sides of the first tearing seam; a first connecting part for connecting the two first pins is arranged in the middle of the first conductive sheet; the first pin and the first conductive part are connected through the first connecting part;
[0008] A middle connecting piece and two second pins are arranged on the second conductive sheet; the middle connecting piece is arranged in the middle of the inner cavity of the base; the second pins extend to the outside of the second conductive sheet; the second pins are connected to the middle connecting piece through a second connecting part;
[0009] A second tearing seam is arranged on the second conductive sheet; the second pins and the middle connecting piece are respectively arranged on two sides of the second tearing seam;
[0010] The conductive elastic sheet is provided with an upward convex shape at a position opposite to the middle connecting piece.
[0011] Further, a convex shape upward is arranged at the edge of the first conductive part close to the first tearing seam.
[0012] Further, a slot hole is arranged on the top surface of the middle connecting piece.
[0013] Further, the number of the conductive elastic sheets is three; the three conductive elastic sheets are stacked in the height direction.
[0014] Further, a rib protruding outward from the base is arranged on the second pin; after the base is formed, the rib extends outward.
[0015] Further, a concave shape is arranged on the bottom surface of the second conductive sheet.
[0016] Further, the first conductive sheet has a "U" - shaped structure; the second conductive sheet has a "T" - shaped structure; an opening is arranged in the middle of the first conductive sheet; the middle connecting piece extends into the opening.
[0017] After adopting the above structure, the beneficial effects of the present utility model are as follows: The conductive elastic sheet is provided with an upward convex shape at the position facing the middle connecting sheet. When using the present utility model, the film adheres the glue dots and the conductive elastic sheet to be sealed and fixed in the inner cavity of the base; the edge of the conductive elastic sheet fits on the first conductive part; and since the middle of the conductive elastic sheet bulges upward and is separated from the middle connecting sheet, the switch is in an open state; when pressing the middle of the film, the glue dots squeeze the middle of the conductive elastic sheet, so that the middle of the conductive elastic sheet is connected to the middle connecting sheet, and thus the first conductive sheet is conducted with the second conductive sheet through the conductive elastic sheet; after releasing the extrusion of the film, the conductive elastic sheet resets itself to restore its shape, so that the first conductive sheet and the second conductive sheet are disconnected; the second conductive sheet is tightly fixed by the plastic edge; when soldering and passing through the furnace, the rosin on the first pin flows along the first pin. Since the first tear seam is filled when forming the base, a baffle is formed at the position of the first tear seam to block the rosin; therefore, the penetration path of the rosin needs to reach the first connecting part along the first pin and then enter the first conductive part. In the limited length space of the first conductive sheet through the first tear seam, the penetration path of the rosin can be extended to the greatest extent, so that the rosin has cooled and solidified before entering the first conductive part, reducing the chance of the rosin solidifying on the first conductive part; similarly, a second tear seam is provided between the middle connecting sheet and the second pin, which is also used to extend the path of the rosin entering the middle connecting sheet. In this way, on the premise of ensuring that the switch will not be insulated by rosin, the total length of the entire tactile switch can be made smaller, and the volume of the switch can be made smaller. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a structural schematic diagram of the present utility model;
[0019] Figure 2 is a sectional view of the present utility model;
[0020] Figure 3 is an exploded view of the first conductive sheet adopting a plurality of short convex structures in the present utility model;
[0021] Figure 4 is an exploded view of the first conductive sheet adopting a long convex structure in the present utility model;
[0022] Figure 5 is a structural diagram of the combination of the first conductive and second conductive sheets adopting a plurality of short convex structures;
[0023] Figure 6 is a structural diagram of the combination of the first conductive and second conductive sheets adopting a single long convex structure;
[0024] Figure 7 is a structural diagram of the first conductive structure with a plurality of short convex structures;
[0025] Figure 8It is the first conductive structure diagram of a single long convex structure;
[0026] Figure 9 It is the structure diagram of the second conductive sheet;
[0027] Explanation of reference numerals:
[0028] 1. Film; 2. Base; 201. Plastic edge; 3. First conductive sheet; 301. First conductive part;
[0029] 301a. Convex; 302. First pin; 303. First connecting part; 304. First tearing seam;
[0030] 305. Opening; 4. Second conductive sheet; 401. Second pin; 402. Second connecting part;
[0031] 403. Second tearing seam; 404. Rib; 405. Middle connecting piece; 405a. Slot hole;
[0032] 406. Concave; 5. Adhesive point; 6. Conductive elastic sheet. Detailed implementation mode
[0033] The present utility model will be further described below in conjunction with the accompanying drawings.
[0034] As Figures 1 to 9 shown, a thin film tactile switch structure described in the present utility model includes a base 2 with an open top surface; a first conductive sheet 3 and a second conductive sheet 4 are arranged in the inner cavity of the base 2; at least one conductive elastic sheet 6 is arranged in the inner cavity of the base 2; a film 1 for sealing the top surface of the base 2 is arranged on the top end surface of the base 2; an adhesive point 5 is arranged between the film 1 and the conductive elastic sheet 6; both the first conductive sheet 3 and the second conductive sheet 4 penetrate through the left and right sides of the base 2; the conductive elastic sheet 6 is arranged between the adhesive point 5 and the second conductive sheet 4;
[0035] The first conductive sheet 3 is provided with a first conductive part 301 and two first pins 302; the first conductive part 301 is arranged in the inner cavity of the base 2; the ends of the first pins 302 extend to the outside of the base 2; a first tearing seam 304 is arranged on the first conductive sheet 3; the first pins 302 and the first conductive part 301 are respectively arranged on both sides of the first tearing seam 304; a first connecting part 303 for connecting the two first pins 302 is arranged in the middle of the first conductive sheet 3; the first pins 302 and the first conductive part 301 are connected through the first connecting part 303;
[0036] The second conductive sheet 4 is provided with a middle connecting sheet 405 and two second pins 401; the middle connecting sheet 405 is arranged in the middle of the inner cavity of the base 2; the second pins 401 extend to the outside of the second conductive sheet 4; the second pins 401 are connected to the middle connecting sheet 405 through second connecting parts 402;
[0037] The second conductive sheet 4 is provided with a second tearing seam 403; the second pins 401 and the middle connecting sheet 405 are respectively arranged on both sides of the second tearing seam 403;
[0038] The conductive elastic sheet 6 is provided with an upward convex shape at a position facing the middle connecting sheet 405;
[0039] The first tearing seam 304 and the second tearing seam 403 are respectively slits formed on the first conductive sheet 3 and the second conductive sheet 4;
[0040] The film 1 seals and fixes the glue dots 5 and the conductive elastic sheet 6 in the inner cavity of the base 2; the edge of the conductive elastic sheet 6 fits on the first conductive part 301; and since the middle part of the conductive elastic sheet 6 bulges upward and is separated from the middle connecting sheet 405, the switch is in an off state; pressing the middle part of the film 1, the glue dots 5 squeeze the middle part of the conductive elastic sheet 6, so that the middle part of the conductive elastic sheet 6 is connected to the middle connecting sheet 405, and thus the first conductive sheet 3 is conducted with the second conductive sheet 4 through the conductive elastic sheet 6; after releasing the extrusion of the film 1, the conductive elastic sheet 6 resets itself to restore its shape, so that the first conductive sheet 3 is disconnected from the second conductive sheet 4; the second conductive sheet 4 is tightly fixed by the plastic edge 201;
[0041] During soldering and passing through the furnace, the rosin of the first pin 302 flows along the first pin 302. Since the first tearing seam 302 is filled when forming the base 2, a baffle is formed at the position of the first tearing seam 304 to block the rosin; therefore, the trajectory of the rosin penetration needs to reach the first connecting part 303 along the first pin 302 and then enter the first conductive part 301. In the limited length space of the first conductive sheet 3 through the first tearing seam 304, the penetration path of the rosin can be extended to a great extent, so that the rosin has cooled and solidified before entering the first conductive part 301, reducing the chance of the rosin solidifying on the first conductive part 301; similarly, a second tearing seam 403 is arranged between the middle connecting sheet 405 and the second pin 401, which is also used to extend the path of the rosin entering the middle connecting sheet 405. In this way, on the premise of ensuring that the switch will not be insulated by rosin, the total length of the entire tactile switch can be made smaller, and the volume of the switch can be made smaller.
[0042] As a preferred mode of the present invention, the first conductive part 301 is provided with an upward convex 301a at the edge close to the first tearing seam 304;
[0043] When the switch is turned on, the conductive elastic piece 6 can more easily come into contact and conduct electricity with the convex part 301a. Moreover, the base 2 also forms an upward protrusion at the bottom of the convex part 301a, which can enable the first conductive sheet 3 to be on the base 2; the convex part 301a can be multiple short convex parts or a long convex part.
[0044] As a preferred embodiment of the present invention, a slot hole 405a is provided on the top surface of the middle connecting piece 405; in addition to enhancing the strength of the middle connecting piece 405, the slot hole 405a can also form a chip-containing space to accommodate metal chips generated by friction.
[0045] As a preferred embodiment of the present invention, the number of the conductive elastic pieces 6 is three; the three conductive elastic pieces 6 are stacked in the height direction.
[0046] As a preferred embodiment of the present invention, a rib 404 protruding outward from the base 2 is provided on the second pin 401; after the base 2 is formed, the rib 404 extends outward, and the rib 404 forms a terminal multi-gold leakage mark, which is convenient for judging the wiring direction of the switch.
[0047] As a preferred embodiment of the present invention, a concave part 406 is provided on the bottom surface of the second conductive sheet 4; the concave part 406 enables a convex part paired with the concave part 406 to be formed on the inner cavity surface of the base 2 when the base 2 is formed, so as to position the second conductive sheet 4 and position the second conductive sheet 4 on the base 2.
[0048] As a preferred embodiment of the present invention, the first conductive sheet 3 has a "U"-shaped structure; the second conductive sheet 4 has a "T"-shaped structure; an opening 305 is provided in the middle of the first conductive sheet 3; the middle connecting piece 405 extends into the opening 305; the first conductive sheet 3 and the second conductive sheet 4 are shape-matched, making full use of the space of the base 2 and making the volume of the entire switch structure smaller.
[0049] The above is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structures, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.
Claims
1. A structure of a membrane touch switch, characterized in that: It includes a base (2) with an open top surface; a first conductive sheet (3) and a second conductive sheet (4) are arranged in the inner cavity of the base (2); at least one conductive elastic sheet (6) is arranged in the inner cavity of the base (2); a film (1) for sealing the top surface of the base (2) is arranged on the top end surface of the base (2); a glue dot (5) is arranged between the film (1) and the conductive elastic sheet (6); both the first conductive sheet (3) and the second conductive sheet (4) penetrate through the left and right sides of the base (2); the conductive elastic sheet (6) is arranged between the glue dot (5) and the second conductive sheet (4). The first conductive sheet (3) is provided with a first conductive part (301) and two first pins (302); the first conductive part (301) is arranged in the inner cavity of the base (2); the ends of the first pins (302) extend out of the base (2); a first tearing seam (304) is arranged on the first conductive sheet (3); the first pins (302) and the first conductive part (301) are respectively arranged on both sides of the first tearing seam (304); a first connecting part (303) for connecting the two first pins (302) is arranged in the middle of the first conductive sheet (3); the first pins (302) are connected to the first conductive part (301) through the first connecting part (303). The second conductive sheet (4) is provided with a middle connecting sheet (405) and two second pins (401); the middle connecting sheet (405) is arranged in the middle of the inner cavity of the base (2); the second pins (401) extend out of the second conductive sheet (4); the second pins (401) are connected to the middle connecting sheet (405) through a second connecting part (402). A second tearing seam (403) is arranged on the second conductive sheet (4); the second pins (401) and the middle connecting sheet (405) are respectively arranged on both sides of the second tearing seam (403). The conductive elastic sheet (6) is provided with an upward convex shape at a position facing the middle connecting sheet (405).
2. The structure of a membrane tactile switch according to claim 1, wherein: The first conductive part (301) is provided with an upward convex type (301a) at the edge close to the first tearing seam (304).
3. A thin-film tactile switch structure according to claim 1, characterized in that: A slot hole (405a) is arranged on the top surface of the middle connecting sheet (405).
4. A thin film tactile switch structure according to claim 1, characterized in that: The number of the conductive elastic sheets (6) is three; the three conductive elastic sheets (6) are stacked in the height direction.
5. A film tactile switch structure according to claim 1, characterized in that: A convex strip (404) protruding outwards from the base (2) is arranged on the second pin (401); after the base (2) is formed, the convex strip (404) extends outwards.
6. The structure of a membrane tactile switch according to claim 1, characterized in that: A concave type (406) is arranged on the bottom surface of the second conductive sheet (4).
7. A thin film tactile switch structure according to claim 1, characterized in that: The first conductive sheet (3) has a "U"-shaped structure; the second conductive sheet (4) has a "T"-shaped structure; an opening (305) is arranged in the middle of the first conductive sheet (3); the middle connecting sheet (405) extends into the opening (305).