Anti-deviation key spring

Abstract

The utility model discloses a kind of anti-deviation key spring, including spring body and base, the base has the cavity for installing three spring bodies, the spring body is arranged in cavity by laminated mode, the spring body includes fixed part, pressing part and the rebound part connected between the fixed part and the pressing part, the edge of the fixed part of the spring body is matched with the cavity side wall of the base, to limit the movement of spring body relative to base.Fixed part four-side corner anti-deviation convex edge forms static constraint, limits spring XY plane translation and rotation, the surface contact of cooperation fixed part edge and base cavity, completely avoid spring deviation, reduce and circuit board plating layer friction, further guarantee the contact resistance of silver plating layer, satisfy the low resistance, high electrically conductive stability demand of precision equipment.

Description

Technical Field

[0001] This utility model relates to the field of spring technology, specifically to an anti-offset button spring. Background Technology

[0002] In the buttons of mobile phones and other electronic devices, the button spring is the core component that realizes the pressing feedback and signal conduction. Its performance stability and service life directly determine the user experience of the device.

[0003] However, traditional button springs have many technical drawbacks: they are prone to left and right displacement after being installed on the base. During the displacement process, they will rub against the circuit board plating and generate fine powder, which will not only increase the contact resistance and damage the conductivity stability, but also shorten the overall life of the spring; and they are difficult to withstand long-term high-frequency pressing, and cannot meet the requirements of thin and light electronic devices and structural strength. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides an anti-offset button spring, which can effectively solve the problems mentioned in the background art.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] An anti-offset button spring includes a spring body and a base. The base has a cavity for mounting three spring bodies. The spring bodies are stacked in the cavity. Each spring body includes a fixing part, a pressing part, and a return part connecting the fixing part and the pressing part. The edges of the fixing parts of the spring bodies all cooperate with the sidewall of the cavity of the base to limit the movement of the spring bodies relative to the base.

[0007] The fixing part is provided with at least three anti-displacement protrusions, which are integrally formed on the edge of the spring body. The outer side wall of the anti-displacement protrusion is configured to contact the inner side wall of the base to limit the horizontal displacement of the spring body in the cavity of the base.

[0008] As a further description of the above technical solution, the number of anti-offset protrusions is four, which are respectively arranged at the four corners of the fixing part.

[0009] As a further description of the above technical solution, the upper and lower surfaces of the anti-offset protrusion are planes, and the anti-offset protrusion has rounded corners.

[0010] As a further description of the above technical solution, the springback part is provided with an arc-shaped curved surface.

[0011] As a further description of the above technical solution, the pressing part has a spherical structure and is located in the central region of the spring body.

[0012] As a further description of the above technical solution, the fixing part, the pressing part, and the rebound part are integrally formed with the spring body.

[0013] As a further description of the above technical solution, the material of the spring body is SUS301 stainless steel, with a hardness of 570-600HV and a thickness of 0.025-0.04mm.

[0014] As a further description of the above technical solution, the rebound stroke of the rebound section is 0.12-0.15mm.

[0015] As a further description of the above technical solution, the surface of the spring body is covered with a high-temperature resistant film.

[0016] As a further description of the above technical solution, the outer arc diameter of the arc surface is 1.7 mm, and the inner arc diameter is 2.15 mm.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] The anti-offset button spring of this utility model has at least one of the following beneficial effects during use:

[0019] The four corner anti-offset protrusions of the fixing part form a statically determinate constraint, limiting the translation and rotation of the spring in the XY plane. Combined with the surface contact between the edge of the fixing part and the base cavity, this completely prevents spring offset, reduces friction with the circuit board plating, and further ensures the contact resistance of the silver plating layer, meeting the low resistance and high conductivity stability requirements of precision equipment. The spherical pressing part disperses external force to prevent cracking, and the arc-shaped rebound part ensures a consistent pressing feel. The material is SUS301 stainless steel (hardness 570-600HV), which has fatigue resistance and ultra-thin characteristics. The spring is integrally molded to prevent breakage, and its surface has a high-temperature resistant film to prevent oxidation and corrosion, significantly extending the spring's life and reducing equipment maintenance costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the assembly structure of an anti-offset button spring according to the present invention;

[0021] Figure 2 This is a schematic diagram of the overall structure of an anti-offset button spring according to the present invention;

[0022] Figure 3 This is a top view of the anti-offset button spring of this utility model;

[0023] Figure 4 This is a side view of the anti-offset button spring of this utility model.

[0024] Numbering on the map:

[0025] 1. Spring body; 11. Fixing part; 12. Pressing part; 13. Rebound part; 111. Anti-displacement protrusion; 112. Rounded corner; 113. Arc-shaped surface; 2. Base. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figure 1-4 As shown, this utility model provides an anti-offset button spring, including a spring body 1 and a base 2. The base 2 has a cavity for mounting three spring bodies 1. The spring bodies 1 are stacked in the cavity. Each spring body 1 includes a fixing part 11, a pressing part 12, and a return part 13 connecting the fixing part 11 and the pressing part 12. The edges of the fixing parts 11 of the spring bodies 1 are all engaged with the side walls of the cavity of the base 2 to restrict the movement of the spring bodies 1 relative to the base 2.

[0028] This embodiment employs four protruding edges (preferably distributed at the corners) to construct a statically determinate constraint, preventing the spring from translating or rotating in the XY plane (reducing degrees of freedom), far exceeding the stability of two-point positioning. This further reduces direct friction between the spring and the base 2, protecting the integrity of the spring surface and the circuit board plating. If the plating remains undamaged, the resistance value remains in its initial state (e.g., the contact resistance of the silver plating ≤ 50mΩ), and will not increase with usage time, meeting the requirements of precision electronic devices (such as keyboards and vehicle control buttons) for "low resistance and high conductivity stability."

[0029] The spring is embedded into the cavity through an automated stacking process. The cavity contour and the edge of the fixing part 11 of the spring body 1 form a "contour fit", providing initial radial positioning for the spring and avoiding misalignment during stacking installation. The edge of the fixing part 11 fits tightly against the side wall of the cavity of the base 2, forming a "face-to-face" contact, which limits the large displacement of the spring along the radial direction of the cavity.

[0030] The fixing part 11 is provided with at least three anti-displacement protrusions 111, which are integrally formed on the edge of the spring body 1. The outer side wall of the anti-displacement protrusion 111 is configured to contact the inner side wall of the base 2 to limit the horizontal displacement of the spring body 1 in the cavity of the base 2.

[0031] The fixing part 11 has at least three anti-displacement protrusions 111 (preferably four, arranged at the four corners) integrally formed on its edge. The outer wall of the protrusions is completely fitted with the inner wall of the base 2, covering the spring in the four horizontal directions of "front, back, left and right", forming a "point-to-point" precise limit.

[0032] Furthermore, there are four anti-offset protrusions 111, which are respectively arranged at the four corners of the fixing part 11.

[0033] Furthermore, the upper and lower surfaces of the anti-displacement protrusion 111 are flat, and the anti-displacement protrusion 111 has rounded corners 112. This ensures the stability of the fit between the protrusion and the base 2 during long-term use and avoids the gap from widening due to stress accumulation.

[0034] Furthermore, the rebound portion 13 is provided with an arc-shaped curved surface 113. The rebound portion 13 adopts an arc-shaped curved surface 113 design (outer arc diameter 1.7mm, inner arc diameter 2.15mm). When pressed, the rebound portion 13 produces "controllable downward deformation" along the arc-shaped curved surface 113. The deformation range is precisely limited by a rebound stroke of 0.12-0.15mm to ensure a consistent pressing feel (without being too soft or too hard).

[0035] Furthermore, the pressing part 12 has a spherical structure and is located in the central region of the spring body 1. The pressing part 12 has a central spherical structure, which can evenly distribute external force to the peripheral rebound parts 13, avoiding cracking or uneven deformation of the spring caused by localized force concentration.

[0036] Furthermore, the fixing part 11, the pressing part 12, and the rebound part 13 are integrally formed with the spring body 1. This integral molding eliminates seams and avoids the "breakage at the joint" problem common in traditional split springs. This improves overall service life and reduces equipment maintenance costs.

[0037] Furthermore, the spring body 1 is made of SUS301 stainless steel with a hardness of 570-600 HV and a thickness of 0.025-0.04 mm. The 570-600 HV hardness of SUS301 stainless steel can resist fatigue deformation under long-term pressure. The ultra-thin thickness of 0.025-0.04 mm ensures structural strength while also taking into account the lightweight nature of the spring, adapting to the "thin and light" requirements of electronic devices.

[0038] Furthermore, the springback stroke of the springback section 13 is 0.12-0.15 mm.

[0039] Furthermore, the surface of the spring body 1 is covered with a high-temperature resistant film.

[0040] The surface of the spring is coated with a high-temperature resistant film by laser welding, which isolates it from factors such as high temperature, humidity, and chemical corrosion, thus preventing the spring from oxidizing and rusting.

[0041] Furthermore, the outer arc diameter of the arc-shaped surface 113 is 1.7 mm, and the inner arc diameter is 2.15 mm.

[0042] In summary, the anti-displacement protrusion 111 of the spring body 1 ensures that the spring has no horizontal displacement, thus fundamentally avoiding friction with the plating layer. It maintains its initial feel even after tens of thousands of presses, making it suitable for high-frequency use. During use, it effectively prevents the spring from shifting, keeping it stationary and preventing it from rubbing against the circuit board and scratching the silver plating layer. Damage to the silver plating layer would increase resistance, but this product does not shift during use, thus preventing friction against the silver plating layer, exhibiting a long lifespan and low resistance.

[0043] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An anti-offset button spring, comprising a spring body (1) and a base (2), wherein the base (2) has a cavity for mounting three spring bodies (1), the spring bodies (1) being disposed in the cavity in a stacked manner, characterized in that: The spring body (1) includes a fixing part (11), a pressing part (12) and a rebound part (13) connected between the fixing part (11) and the pressing part (12). The edges of the fixing part (11) of the spring body (1) are engaged with the side wall of the cavity of the base (2) to limit the movement of the spring body relative to the base. The fixing part (11) is provided with at least three anti-displacement protrusions (111), which are integrally formed on the edge of the spring body (1). The outer side wall of the anti-displacement protrusion (111) is configured to contact the inner side wall of the base (2) to limit the horizontal displacement of the spring body (1) in the cavity of the base (2).

2. The anti-offset button spring according to claim 1, characterized in that: The number of anti-offset protrusions (111) is four, which are respectively arranged at the four corners of the fixing part (11).

3. The anti-offset button spring according to claim 1 or 2, characterized in that: The upper and lower surfaces of the anti-offset protrusion (111) are planes, and the anti-offset protrusion (111) has rounded corners (112).

4. The anti-offset button spring according to claim 1, characterized in that: The spring-loaded part (13) is provided with an arc-shaped curved surface (113).

5. The anti-offset button spring according to claim 1, characterized in that: The pressing part (12) has a spherical structure and is located in the central region of the spring body (1).

6. The anti-offset button spring according to claim 1, characterized in that: The fixing part (11), the pressing part (12) and the rebound part (13) are integrally formed with the spring body (1).

7. The anti-offset button spring according to claim 1, characterized in that: The material of the spring body (1) is SUS301 stainless steel, with a hardness of 570-600HV and a thickness of 0.025-0.04mm.

8. The anti-offset button spring according to claim 1, characterized in that: The springback stroke of the springback section (13) is 0.12-0.15 mm.

9. The anti-offset button spring according to claim 1, characterized in that: The surface of the spring body (1) is covered with a high-temperature resistant film (3).

10. The anti-offset button spring according to claim 4, characterized in that: The outer arc diameter of the arc-shaped surface (113) is 1.7 mm, and the inner arc diameter is 2.15 mm.

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