Backlight plastic key

Abstract

The utility model relates to a kind of backlight plastic key in the field of plastic key, including key cap, base and control circuit board, base is fixedly installed on the surface of control circuit board, key cap is connected with base, and key cap can be lifted and moved relative to base, elastic reset component is arranged between key cap and base, the surface of control circuit board is welded with single-point switch and backlight source, the middle part of base is provided with the sleeve mouth matched with the installation key cap, single-point switch and backlight source extend into sleeve mouth, key cap includes transparent light guide layer, outer sleeve layer and inner layer, transparent light guide layer is located between outer sleeve layer and inner layer, the surface of transparent light guide layer is provided with protruding icon, inner layer uses non-light transmission material, its mounting post is tightly matched with base sleeve mouth, physical barrier light ray overflow from the assembly gap between key cap and base.

Description

Technical Field

[0001] This utility model relates to the field of plastic buttons, and in particular to a backlit plastic button. Background Technology

[0002] Backlit buttons are interactive elements that use a built-in light source to illuminate icons, and are widely used in electronic devices such as keyboards and control panels. Their core function is to provide clear visual guidance in low-light environments, and they typically consist of keycaps, a base, a backlight, and a switch assembly.

[0003] Currently, backlit buttons commonly suffer from light leakage, where light from the backlight spills out from the gap between the keycap and the base, creating a halo effect. This defect not only reduces visual contrast but also affects the overall aesthetics of the device. Utility Model Content

[0004] In order to overcome the shortcomings of existing technical solutions, this utility model provides a backlit plastic button that can effectively solve the technical problem of light leakage.

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

[0006] A backlit plastic key includes a keycap, a base, and a control circuit board. The base is fixedly mounted on the surface of the control circuit board. The keycap is connected to the base and can move up and down relative to the base. An elastic reset component is provided between the keycap and the base. A single-point switch and a backlight are soldered to the surface of the control circuit board. A socket for mounting the keycap is provided in the middle of the base. The single-point switch and the backlight extend into the socket. The keycap includes a transparent light guide layer, an outer layer, and an inner layer. The transparent light guide layer is located between the outer layer and the inner layer. A raised icon is provided on the surface of the transparent light guide layer, extending to the surface of the outer layer. A mounting post is provided on the inner wall of the inner layer, which can be inserted into the socket. A pressing post for triggering the single-point switch is provided on the bottom surface of the transparent light guide layer, extending to the middle of the mounting post and aligned vertically with the single-point switch.

[0007] Furthermore, the surface of the mounting post is provided with a guide groove, and the inner wall of the sleeve is provided with a guide protrusion that slides in cooperation with the guide groove.

[0008] Furthermore, limiting portions are provided at the ends of the mounting post and at the openings of the sleeve.

[0009] Furthermore, the elastic reset assembly includes a guide sleeve, a reset post, and a reset spring. The reset post is slidably connected to the guide sleeve, and the reset spring is disposed inside the guide sleeve. The two ends of the reset spring are in contact with the bottom surfaces of the reset post and the guide sleeve, respectively.

[0010] Furthermore, a support frame is provided on the surface of the control circuit board, the support frame extends into the mounting column, the backlight extends to the surface of the support frame, and the side wall of the support frame slides in conjunction with the inner wall of the mounting column.

[0011] Furthermore, the transparent light guide layer, outer layer, and inner layer are integrally formed by injection molding.

[0012] Compared with the prior art, the beneficial effects of this utility model are: through the three-layer keycap structure, the outer layer, the transparent light guide layer and the inner layer achieve efficient light leakage prevention. The inner layer is made of non-transparent material, and its mounting post fits tightly with the base sleeve, physically blocking light from overflowing from the assembly gap between the keycap and the base. The transparent light guide layer only allows light to be vertically transmitted to the surface icon. Combined with the vertical alignment design of the pressing post and the single-point switch, it ensures concentrated utilization of light energy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the guide protrusion and guide groove in this utility model;

[0015] The following are the labels in the diagram: 1-Keycap, 2-Base, 3-Control circuit board, 4-Single-point switch, 5-Backlight, 6-Sleeve opening, 601-Guide protrusion, 7-Outer layer, 8-Transparent light guide layer, 9-Inner layer, 901-Mounting post, 902-Pressing post, 903-Guide groove, 10-Support frame, 11-Limiting part, 12-Guide sleeve, 13-Reset post, 14-Reset spring. Detailed Implementation

[0016] 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.

[0017] The following is combined Figures 1-2 A detailed description of a backlit plastic button according to this utility model is provided:

[0018] A backlit plastic key includes a keycap 1, a base 2, and a control circuit board 3. The base 2 is fixedly mounted on the surface of the control circuit board 3. The keycap 1 is connected to the base 2 and can move up and down relative to the base 2. An elastic reset component is provided between the keycap 1 and the base 2. A single-point switch 4 and a backlight 5 are soldered to the surface of the control circuit board 3. A socket 6 for mounting the keycap 1 is provided in the middle of the base 2. The single-point switch 4 and the backlight 5 extend into the socket 6. The keycap 1 includes a transparent light guide layer 8, an outer layer 7, and an inner layer 9. The transparent light guide layer 8 is located between the outer layer 7 and the inner layer 9. A raised icon is provided on the surface of the transparent light guide layer 8, extending to the surface of the outer layer 7. A mounting post 901 is provided on the inner wall of the inner layer 9, which can be inserted into the socket 6. A pressing post 902 for triggering the single-point switch 4 is provided on the bottom surface of the transparent light guide layer 8. The pressing post 902 extends to the middle of the mounting post 901 and is aligned vertically with the single-point switch 4.

[0019] The surface of the mounting post 901 is provided with a guide groove 903, and the inner wall of the sleeve 6 is provided with a guide protrusion 601 that slides with the guide groove 903. The guide groove 903 of the mounting post 901 slides with the guide protrusion 601 on the inner wall of the sleeve 6 to ensure that the keycap 1 moves without tilting, avoids light leakage or accidental switch activation due to misalignment, and improves the consistency of key feel.

[0020] Limiting parts 11 are provided at the end of the mounting post 901 and at the opening of the sleeve 6. The limiting parts 11 at the end of the mounting post 901 and at the opening of the sleeve 6 form a double mechanical stop to prevent the keycap 1 from being over-pressed and damaging the single-point switch 4, and to limit the range of the keycap 1 from falling out, thereby further reducing the risk of light leakage from the assembly gap.

[0021] The elastic reset assembly includes a guide sleeve 12, a reset post 13, and a reset spring 14. The reset post 13 is slidably connected to the guide sleeve 12, and the reset spring 14 is disposed inside the guide sleeve 12. The two ends of the reset spring 14 contact the bottom surfaces of the reset post 13 and the guide sleeve 12, respectively. The sliding connection structure between the guide sleeve 12 and the reset post 13, in conjunction with the reset spring 14, provides linear rebound force, reducing the probability of button jamming. The built-in spring design avoids external contamination and extends service life.

[0022] The surface of the control circuit board 3 is provided with a support frame 10, which extends into the mounting post 901. The backlight 5 extends to the surface of the support frame 10. The side wall of the support frame 10 is slidably engaged with the inner wall of the mounting post 901. The support frame 10 extends into the mounting post 901 and is slidably engaged with the inner wall, which not only fixes the position of the backlight 5 to ensure vertical light guidance, but also enhances the structural stability through side wall contact and reduces light path deviation caused by vibration.

[0023] The transparent light guide layer 8, outer layer 7, and inner layer 9 are integrally formed by injection molding. The transparent light guide layer 8, outer layer 7, and inner layer 9 are formed in one step, which eliminates light scattering that may occur at the interlayer bonding interface and reduces assembly tolerance.

[0024] The three-layer keycap 1 structure, consisting of an outer layer 7, a transparent light guide layer 8, and an inner layer 9, achieves efficient light leakage prevention. The inner layer 9 is made of non-transparent material, and its mounting post 901 fits tightly with the socket 6 of the base 2, physically blocking light from overflowing from the assembly gap between the keycap 1 and the base 2. The transparent light guide layer 8 only allows light to be vertically transmitted to the surface icons. Combined with the vertical alignment design of the pressing post 902 and the single-point switch 4, it ensures concentrated utilization of light energy.

[0025] 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. A backlit plastic key, comprising a keycap, a base, and a control circuit board, wherein the base is fixedly mounted on the surface of the control circuit board, the keycap is connected to the base and is movable relative to the base, and an elastic reset component is provided between the keycap and the base, characterized in that: The control circuit board has a single-point switch and a backlight soldered on its surface. The base has a socket for mounting keycaps in the middle. The single-point switch and the backlight extend into the socket. The keycap includes a transparent light guide layer, an outer layer, and an inner layer. The transparent light guide layer is located between the outer layer and the inner layer. The surface of the transparent light guide layer has a raised icon that extends to the surface of the outer layer. The inner wall of the inner layer has a mounting post that can be inserted into the socket. The bottom surface of the transparent light guide layer has a pressing post for triggering the single-point switch. The pressing post extends to the middle of the mounting post and is aligned vertically with the single-point switch.

2. The backlit plastic button according to claim 1, characterized in that: The surface of the mounting post is provided with a guide groove, and the inner wall of the sleeve is provided with a guide protrusion that slides with the guide groove.

3. A backlit plastic button according to claim 1, characterized in that: Limiting parts are provided at the ends of the mounting column and at the openings of the sleeve.

4. A backlit plastic button according to any one of claims 1-3, characterized in that: The elastic reset assembly includes a guide sleeve, a reset post, and a reset spring. The reset post is slidably connected to the guide sleeve, and the reset spring is disposed inside the guide sleeve. The two ends of the reset spring are in contact with the bottom surfaces of the reset post and the guide sleeve, respectively.

5. A backlit plastic button according to any one of claims 1-3, characterized in that: The control circuit board has a support frame on its surface, which extends into the mounting column. The backlight extends to the surface of the support frame, and the side wall of the support frame slides into the inner wall of the mounting column.

6. A backlit plastic button according to any one of claims 1-3, characterized in that: The transparent light guide layer, outer layer, and inner layer are integrally formed by injection molding.

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