Light equalizing structure for backlight of key mask

Abstract

The utility model provides a light equalizing structure of a button mask backlight, comprising a printed circuit board assembly provided with LED lamp beads and a light touch button; and the structural member is connected with the printed circuit board assembly, and the structural member is provided with a key surface film corresponding to the position of the light touch button. The beneficial effects of the utility model are that through the position relation, a light source is reflected for multiple times by using the principle of diffuse reflection of light, and then a relatively uniform light emitting effect is obtained. The structure is simple, the number of assembling procedures is small, and the replicability is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to a light uniformity structure of key mask backlight. BACKGROUND

[0002] The existing key backlight scheme mostly adopts a relatively complex structure to strive for the uniform light emission of the silk screen on the key. Or a light uniformity layer is used to make the light emitted by the LED lamp bead softened down after passing through the light uniformity sheet and finally uniformly irradiate on the key mask, but the requirement for the space thickness is relatively high. Or a side light source plus a light guide sheet is used to make a uniform light emission layer appear below the key mask, but the structure is relatively complex and needs the cooperation of multiple parts. The process structures of the two kinds of modes are relatively complex, and accurate positioning is needed in the assembling process. UTILITY MODEL CONTENT

[0003] Therefore, the utility model provides a light uniformity structure of key mask backlight to achieve the purpose of reducing the assembling process.

[0004] The utility model provides the following technical scheme: a light uniformity structure of key mask backlight, comprising:

[0005] The printed circuit board assembly is provided with an LED lamp bead and a light touch button. The structural member is connected with the printed circuit board assembly, and the structural member is provided with a key mask corresponding to the position of the light touch button.

[0006] Further, the light touch button is multiple, the LED lamp bead is multiple groups, and one light touch button is arranged between the adjacent two groups of LED lamp beads.

[0007] Further, the printed circuit board assembly comprises a printed circuit board body, and the multiple light touch buttons and the multiple groups of LED lamp beads are all arranged on the printed circuit board body.

[0008] Further, the printed circuit board body is made of white material.

[0009] Further, the structural member is arranged opposite to and connected with the printed circuit board assembly, and the structural member comprises a protruding part, and the protruding part corresponds to the position of the LED lamp bead.

[0010] Further, the protruding part and the key mask are both multiple, and the protruding part is arranged between the adjacent two key masks.

[0011] Further, the surface of each protruding part towards the LED lamp bead is formed with a diffuse reflection layer through a diffuse reflection process.

[0012] Further, the key mask is provided with a black silk screen part at the outer periphery and a white character part at the middle part.

[0013] Further, the structural member is provided with a back adhesive film on the side away from the printed circuit board assembly.

[0014] Compared with the prior art, the at least one technical scheme of the utility model can reach the beneficial effects at least including: through the positional relationship, a more uniform light emitting effect is obtained through the light diffuse reflection principle and multiple reflections of the light source. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical schemes of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 is the overall structure schematic view of the utility model embodiment;

[0017] Figure 2 is the structure schematic view of the printed circuit board assembly of the utility model embodiment;

[0018] Figure 3 is the light path diagram of the utility model embodiment.

[0019] The reference signs in the drawings are as follows: 1, printed circuit board assembly; 11, LED lamp bead; 12, light touch button; 13, printed circuit board body; 2, structural member; 21, key surface film; 22, protruding part; 3, back adhesive film. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in detail below with reference to the drawings.

[0021] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0022] As Figures 1 to 3 shown, the utility model embodiment provides a key surface film back light uniform light structure, including printed circuit board assembly 1 and structural member 2. Printed circuit board assembly 1 is provided with LED lamp bead 11 and light touch button 12;Structural member 2 is connected with printed circuit board assembly 1, and the key surface film 21 corresponding to the position of the light touch button 12 is arranged on the structural member 2.

[0023] Through the positional relationship, a more uniform light emitting effect is obtained through the light diffuse reflection principle and multiple reflections of the light source. Its structure is simple, the assembly process is less, and it has good replicability.

[0024] The utility model discloses a plurality of light touch button 12, LED lamp pearl 11 is multiple groups, and the light touch button 12 is arranged between two adjacent LED lamp pearl 11 groups. Specifically, each group of LED lamp pearl 11 can include at least 1 LED lamp pearl, and the specific quantity of LED lamp pearl can be changed according to different needs, so that the panel of different brightness is obtained.

[0025] Printed circuit board assembly 1 includes printed circuit board body 13, and multiple light touch buttons 12 and multiple groups of LED lamp pearls 11 are spaced apart on the printed circuit board body 13. The printed circuit board body 13 in the embodiment is L-shaped, and the multiple light touch buttons 12 and the multiple groups of LED lamp pearls 11 are sequentially and spaced apart along the extension direction of the printed circuit board body 13.

[0026] The above-mentioned button mask 21 can be adjusted according to the position of the light touch button 12, so as to ensure the purpose of covering and protecting the light touch button 12.

[0027] A circle around the button mask 21 can be printed with black silk printing (light shielding), the button position is punched, and a transparent silica gel soft pad is pasted on the back, so as to ensure the button feel. White characters (light transmission) are silk printed on the button, and when the backlight reaches the back of the button mask, the silk printed area with light transmission will emit uniform light.

[0028] Preferably, the printed circuit board body 13 in the embodiment is made of white material. The structural part 2 is arranged opposite to and connected with the printed circuit board assembly 1, and the structural part 2 includes a protruding part 22 corresponding to the position of the LED lamp pearl 11. The surface of each protruding part 22 facing the LED lamp pearl 11 is processed to form a diffuse reflection layer by diffuse reflection process.

[0029] The backlight emitted by the LED lamp pearl 11 first reaches the protruding part 22 of the structural part 2. Since the surface of the protruding part 22 is processed to form a diffuse reflection layer by diffuse reflection process, the diffuse reflection effect can be increased, and the light will be diffusely reflected on the surface. The reflected light reaches the surface of the white printed circuit board body 13 and is reflected to the back of the button mask 21 again, as shown in FIG. 6. Figure 3

[0030] Preferably, the protruding part 22 and the button mask 21 are both multiple, and the protruding part 22 is arranged between two adjacent button masks 21. The optimal layout of diffuse reflection can be realized by the spaced-apart protruding part 22 and button mask 21, the uniformity of light is improved, and the brightness of the light reaching the back of the button mask is uniform.

[0031] As shown in FIG. 6, the light emitted by the LED lamp pearl 11 is diffusely reflected on the surface of the protruding part 22, and then reaches the surface of the white printed circuit board body 13. The light is reflected to the back of the button mask 21 again, and the light emitted by the LED lamp pearl 11 is diffusely reflected on the surface of the protruding part 22. Figure 1 ​As shown, the structural member 2 of the embodiment is provided with a back adhesive film 3 on the side away from the printed circuit board assembly 1. The back adhesive film 3 can facilitate the whole printed circuit board assembly 1 to be pasted to a set position, of course, other connection modes can also be adopted, which does not have any limitation on the protection scope.

[0032] The above is only a specific embodiment of the present application, which cannot limit the scope of the application, so the replacement of equivalent components or equivalent changes and modifications made within the scope of the present application should still belong to the scope of the present application. In addition, the technical features in the present application can be freely combined.

Claims

1. A uniform light structure for a key face film backlight, characterized by, The application relates to a printed circuit board assembly (1) provided with LED lamp beads (11) and light touch buttons (12). A structure member (2) is connected with the printed circuit board assembly (1), the structure member (2) is provided with key face films (21) corresponding to the positions of the light touch buttons (12); the structure member (2) is oppositely arranged and connected with the printed circuit board assembly (1), the structure member (2) comprises convex portions (22) corresponding to the positions of the LED lamp beads (11); the surfaces of each convex portion (22) facing the LED lamp beads (11) are formed with diffuse reflection layers through a diffuse reflection process. The light touch buttons (12) are multiple, the LED lamp beads (11) are multiple groups, and one light touch button (12) is arranged between two adjacent groups of LED lamp beads (11).

2. The key face membrane backlight uniformity structure according to claim 1, wherein, The printed circuit board assembly (1) comprises a printed circuit board body (13), and the multiple light touch buttons (12) and the multiple groups of LED lamp beads (11) are arranged on the printed circuit board body (13) at intervals.

3. The key face membrane backlight uniformity structure according to claim 2, characterized in that, The printed circuit board body (13) is made of white material.

4. The key face membrane backlight uniformity structure according to claim 3, characterized in that, The convex portions (22) and the key face films (21) are multiple, and a convex portion (22) is arranged between two adjacent key face films (21).

5. The key face membrane backlight uniformity structure according to claim 1, wherein, The key face film (21) is provided with a black silk printing part located at the outer periphery and a white character part located at the middle part.

6. The key face membrane backlight uniformity structure according to claim 1, wherein, The side, away from the printed circuit board assembly (1), of the structure member (2) is provided with a back adhesive film (3).

7. The key face membrane backlight uniformity structure according to claim 1, wherein, ​

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