CN217690911U - Key backlight structure and luminous key structure - Google Patents

Abstract

The utility model discloses a button structure in a poor light contains leaded light layer, reflection stratum and printing opacity glue film. The light guide layer is provided with a bottom surface, a light emergent surface opposite to the bottom surface and a surface microstructure formed on the light emergent surface. The reflecting layer is arranged below the light guide layer relative to the bottom surface. The surface microstructure corresponding to the light-transmitting adhesive layer is tightly adhered between the reflecting layer and the light guide layer. A light-emitting key structure comprises a bottom plate, a key cap, a supporting mechanism and the key backlight structure. The key backlight structure is superposed with the bottom plate. The supporting mechanism is connected between the base plate and the keycap, so that the keycap can move up and down relative to the base plate and the key backlight structure through the support of the supporting mechanism. The light entering the light guide layer is emitted out of the light guide layer through the light emitting surface to irradiate the light-transmitting indication area of the keycap. The utility model relates to a need not to reduce intensity in a poor light and provide the scope in a poor light with shielding excessive restriction, can effectively reduce the light leak to the influence of user's vision, and can keep providing effectual illumination to the printing opacity subregion of key cap.

Description

Button backlight structure and luminous button structure

technical field

The utility model relates to a luminous key structure, in particular to a key backlight structure of the luminous key structure.

Background technique

In the backlight structure of the traditional luminous keyboard, if the light guide plate is located under the base plate, in order to allow light to pass through the base plate to illuminate the keycaps, the base plate will form a plurality of openings for the light to pass through. Some openings may be close to the bottom of the edge of the keycap, so that the user can directly see the glare light emitted from the opening when using the keyboard, causing discomfort to the user's eyes. If the intensity of the overall backlight is weakened, although the discomfort to the user's eyes can be reduced or eliminated, it will seriously affect the lighting effect of the backlight on the light-transmitting characters on the keycap. If shielding printing is implemented on the light guide plate, although it can improve the light intensity received by the user from these openings, or directly shield the light that may leak out of the keycap, the intensity of the backlight will decrease, for example, for the keycap near the edge. Illumination of translucent characters is significantly reduced.

Utility model content

In view of the problems in the prior art, the utility model provides a key backlight structure and a light-emitting key structure to solve the above problems.

Therefore, the technical problem to be solved by the utility model is to provide a button backlight structure, which includes:

The light guide layer has a bottom surface, a light-emitting surface opposite to the bottom surface, and at least one surface microstructure formed on the light-emitting surface;

a reflective layer disposed below the light guiding layer relative to the bottom surface; and

The light-transmitting adhesive layer is closely attached between the reflective layer and the light-guiding layer corresponding to the surface microstructure.

As an optional technical solution, the at least one surface microstructure falls within the projection of the light-transmitting adhesive layer on the light-emitting surface; or the light-transmitting adhesive layer is in the shape of a line, a U shape, a ㄇ shape, or a word type distribution.

As an optional technical solution, the light transmittance of the light-transmitting adhesive layer is greater than or equal to 90%.

As an optional technical solution, a low reflection layer is formed on the surface of the reflection layer facing the light guide layer corresponding to the at least one surface microstructure.

As an optional technical solution, the low-reflection layer is distributed in a straight, U-shaped, ㄇ-shaped or square shape.

As an optional technical solution, the backlight structure further includes a light-tight shielding layer stacked on the light-emitting surface of the light guide layer, wherein the light-tight shielding layer has at least one opening, and the at least one surface microstructure passes through the At least one opening is exposed.

The utility model also provides a light-emitting button structure, which includes:

floor;

As mentioned above, the key backlight structure is stacked on or under the bottom plate;

A keycap is arranged above the bottom plate and has a light-transmitting indication area; and

a support mechanism, connected between the base plate and the keycap, so that the keycap can move up and down relative to the base plate and the key backlight structure through the support mechanism;

Wherein, the light entering the light guide layer exits the light guide layer through the light-emitting surface to illuminate the light-transmitting indication area.

As an optional technical solution, the bottom plate is stacked on the light-emitting surface of the light guide layer and has at least one opening, and the at least one surface microstructure is exposed through the at least one opening; or,

The at least one surface microstructure is located right below the light-transmitting indication area.

As an optional technical solution, the light-emitting button structure further includes a light source for generating the light, wherein the light guide layer has a light-incident side between the bottom surface and the light-emitting surface, and the light-emitting surface of the light source faces the light-incident side ;or

The light-emitting key structure also includes a light-tight shielding layer stacked on the light-emitting surface of the light-guiding layer, the light-tight shielding layer has an opening, and the at least one surface microstructure is exposed through the opening.

As an optional technical solution, the projection of the keycap on the light-emitting surface includes a central area and a peripheral area surrounding the central area, and the at least one surface microstructure is located in the peripheral area.

Compared with the prior art, in the light-emitting button structure, the surface microstructure is provided on the light-emitting surface of the light guide layer of the button backlight structure to diffuse light and make it soft. Even if this light is received by the user's eyes, the degree of glare can be reduced. Compared with the prior art, the button backlight structure according to the present invention does not need to reduce the intensity of the backlight and excessively limit the range of the backlight provided by shielding, which can effectively reduce the impact of light leakage on the user's vision, and can maintain the light transmission indication of the keycap area provides effective lighting.

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the utility model.

Description of drawings

FIG. 1 is a schematic diagram of the structure of a luminous key according to a first embodiment.

FIG. 2 is a partial exploded view of the light-emitting button structure in FIG. 1 .

FIG. 3 is a cross-sectional view along the line X-X of the light-emitting button structure in FIG. 1 .

FIG. 4 is a top view of a light guide layer of the light-emitting key structure in FIG. 2 .

FIG. 5 is a top view of the distribution of the light-transmitting adhesive layer corresponding to the light-guiding layer according to an embodiment.

FIG. 6 is a top view of the distribution of the light-transmitting adhesive layer corresponding to the light-guiding layer according to another embodiment.

FIG. 7 is a top view of the distribution of the light-transmitting adhesive layer corresponding to the light-guiding layer according to another embodiment.

FIG. 8 is a top view of the distribution of the light-transmitting adhesive layer corresponding to the light-guiding layer according to another embodiment.

9 to 12 are top views of the distribution of the low reflection layer corresponding to the light guide layer according to different embodiments.

Fig. 13 is a cross-sectional view of the light-emitting key structure according to the second embodiment.

Detailed ways

In order to have a further understanding of the purpose, structure, features, and functions of the present utility model, the detailed description is as follows in conjunction with the embodiments.

Please refer to FIG. 1 to FIG. 3 , FIG. 1 is a schematic diagram of the light-emitting key structure according to the first embodiment; FIG. 2 is a partial exploded view of the light-emitting key structure in FIG. 1 ; FIG. 3 is a cross-section along the line X-X of the light-emitting key structure in FIG. 1 picture. The light-emitting button structure 1 of the first embodiment of the present utility model includes a bottom plate 10, a keycap 12, a support mechanism 14, a switch 16 (represented by a hatched circle in FIG. 2 ), an elastic member 18, and a button backlight structure 20 ( It is shown as a single structure in FIG. 1 to simplify the drawing; and in FIG. 3, its size is exaggerated to illustrate its structural details) and the light source 22 (shown in a simple geometric block). The keycap 12 is disposed above the bottom plate 10 . The support mechanism 14 is formed by a scissors foot bracket, but it is not limited to this in practical application; for example, it is formed by a butterfly-shaped bracket (or a V-shaped bracket). The supporting mechanism 14 is connected between the base plate 10 and the keycap 12 , so that the keycap 12 moves up and down relative to the base plate 10 via the supporting mechanism 14 (ie moves along the vertical direction D1 ). The switch 16 is disposed under the keycap 12 . The elastic member 18 is disposed between the keycap 12 and the switch 16 . The elastic member 18 can be made of elastic rubber round protrusions, but not limited to this in practical application; for example, it can be made of coil springs. When the keycap 12 moves downward toward the bottom plate 10 , the keycap 12 will press the elastic member 18 to activate the switch 16 . When the keycap 12 is no longer pressed by an external force, the elastically deformed elastic member 18 can drive the keycap 12 to move upwards and return to its original position. The key backlight structure 20 is stacked under the base plate 10 . The light source 22 is disposed adjacent to the key backlight structure 20 . The light source 22 can be formed by but not limited to one or more light-emitting elements (such as light-emitting diodes), and can also be formed by a light bar or other devices that can provide light. The light emitted by the light source 22 (shown by several arrows in FIG. 3 ) can enter the key backlight structure 20 and be directed to the keycap 12 through the key backlight structure 20 to provide backlight for the keycap 12 . The keycap 12 has a plurality of light-transmitting indicator areas 122 (shown on the keycap 12 by dotted lines). The aforementioned backlight illuminates the light-transmitting indicating areas 122 and can pass through the light-transmitting indicating areas 122 to produce an optical indicating effect. The outline of the light-transmitting indication area 122 can be a geometric figure or a character. In addition, in practical applications, the switch 16 can be formed by, but not limited to, a thin film circuit board 17 (for example, made of a three-layer structure, a switch circuit is formed on the upper and lower layers, and the insulating layer disposed between the upper and lower layers provides circuit insulation; It is shown in a single structure in the figure to simplify the drawing).

In the first embodiment, the key backlight structure 20 includes a light guide layer 202 , a reflective layer 204 and a transparent glue layer 206 . The light guiding layer 202 has a bottom surface 202a, a light emitting surface 202b opposite to the bottom surface 202a, and a plurality of surface microstructures 202c formed on the light emitting surface 202b. The reflective layer 204 is disposed below the light guide layer 202 relative to the bottom surface 202a. The light-transmitting adhesive layer 206 is closely attached between the reflective layer 204 and the light-guiding layer 202 corresponding to the surface microstructure 202c. The light guide layer 202 has a light incident side surface 202d located between the bottom surface 202a and the light exit surface 202b. The light emitting surface of the light source 22 faces the light incident side 202d, and the light emitted by the light source 22 can enter the light guide layer 202 from the light incident side 202d. In practical applications, the surface microstructure 202c may be, but not limited to, disposed directly under the light-transmitting indication area 122 .

The reflective layer 204 can reflect light, increase light utilization efficiency, and improve backlight intensity. The light in the light guide layer 202 exits the light guide layer 202 from the light emitting surface 202 b to serve as the backlight of the keycap 12 . The light emitted from the light guide layer 202 through the surface microstructure 202c on the light-emitting surface 202b will diverge, so that the backlight at this location is soft, and the uniformity of the backlight at this location can also be increased. The intensity of this divergent light decreases significantly with increasing distance. Even if the light is received by the user's eyes, it can effectively reduce the degree of glare. In addition, when reflective points are provided on the bottom surface 202 a of the light guide layer 202 or on the reflective layer 204 , the surface microstructure 202 c can also blur the reflected light points generated by these reflective points. In addition, the surface microstructure 202c in FIG. 3 is only shown as a hemisphere; in practical applications, any microstructure that can diverge light as a whole can be used as the surface microstructure, and will not be described in detail.

Please refer to FIG. 4, which is a top view of the light guide layer 202; wherein, the surface microstructure 202c (also shown in FIG. 2) is represented by a plurality of solid circles, and the keycap 12 is shown on the light guide layer 202 with thick chain lines. The projection 12a on (the light-emitting surface 202b of). The light guide layer 202 has 9 surface microstructures 202c (or 9 microstructure regions) corresponding to one keycap 12 . The projection 12a of the keycap 12 can define a central area 12b (ie, the area enclosed by the thick dotted line in the figure) and a peripheral area surrounding the central area 12b (ie, the area between the thick chain line and the thick dotted line). Both the central area 12b and the peripheral area have distribution of surface microstructures 202c. Wherein, the surface microstructure 202c corresponding to the peripheral area is close to the edge of the projection 12a of the keycap 12, so light leakage (that is, the light emitted from the light-emitting surface 202b of the light guide layer 202 and passes through the edge of the keycap 12) will be diverged by the surface microstructure 202c , it will become soft and can effectively reduce the degree of glare to the user's eyes.

In addition, referring to FIG. 3 and FIG. 4 at the same time, in the first embodiment, the surface microstructure 202c is set corresponding to the opening 102 of the base plate 10 (the outline of which is shown by a thin dotted line on the projection 102a of the surface 202b of the light guide layer 202 ), so that the surface The microstructures 202c can be exposed through the corresponding openings 102 . The distribution area of the surface microstructure 202c is equivalent to the contour of the corresponding opening 102, but it is not limited thereto in practical applications. For example, the distribution area of a single surface microstructure 202 c is slightly larger than the contour of the corresponding opening 102 . For another example, the light guide layer 202 forms surface microstructures on the entire light emitting surface 202b. Moreover, the light guide layer 202 is not limited to a single-layer structure in practical applications. In addition, both the distribution area of the surface microstructure 202c and the projection 102a of the opening 102 on the light guide layer 202 fall within the projection 12a of the keycap 12 , but it is not limited thereto in practical applications.

In addition, in the first embodiment, the light-transmitting adhesive layer 206 can be selected from an appropriate material so that its light transmittance can meet requirements, such as but not limited to greater than or equal to 90%; The light-transmitting adhesive layer 206 is covered in between, but it is not limited to this in practical applications. For example, the light-transmitting adhesive layer 206 is only provided corresponding to several surface microstructures 202c, as shown in FIGS. middle). Wherein, the light-transmitting adhesive layer 206a in FIG. 5 is distributed in a straight line and located below (for example, in a keyboard using the light-emitting key structure 1, the light-transmitting adhesive layer 206a is located on the side of the light-emitting key structure 1 close to the user); In FIG. 6, the light-transmitting adhesive layer 206b is distributed in a U shape, and its opening faces upward (for example, in a keyboard using the luminous key structure 1, the opening faces the side of the luminous key structure 1 away from the user); in FIG. 7, The light-transmitting adhesive layer 206c is distributed in a ㄇ shape; in FIG. 7 , the light-transmitting adhesive layer 206d is distributed in a ㄧ shape. In addition, in the foregoing embodiments, the surface microstructures 202c corresponding to the light-transmitting adhesive layers 206, 206a-206d all fall within the projections of the light-transmitting adhesive layers 206, 206a-206d on the light-emitting surface 202b, but in actual applications, there is no This is the limit.

In addition, in practical applications, in the first embodiment, a low reflection layer is formed on the surface 204a of the reflection layer 204 facing the light guide layer 202 corresponding to the surface microstructure 202c (such as but not limited to being formed on the surface 204a by printing) , to locally reduce the intensity of the reflected light, thereby reducing the intensity of light leakage; this structural design can reduce the degree of glare without excessively affecting the intensity of the backlight. In practical applications, the low reflective layer can be provided as required, and need not be provided on the entire surface 204a corresponding to all the surface microstructures 202c. For example, as shown in Figures 9 to 12 (the projections corresponding to the low reflection layers 205a to 205d are shown in the figures with hatched areas), the low reflection layer 205a in Figure 9 is distributed in a straight line (for example, in the light-emitting key structure 1 close to the side of the user), the low-reflection layer 205b in Figure 10 is U-shaped (for example, its opening faces the side of the light-emitting key structure 1 away from the user), and the low-reflection layer 205c in Figure 11 is U-shaped distribution, the low reflection layer 205d in FIG. 12 is in the shape of a zigzag distribution. In addition, in the foregoing embodiments, the surface microstructures 202c corresponding to the low-reflection layers 205a-205d fall within the projections of the low-reflection layers 205a-205d on the light-emitting surface 202b, but the practical application is not limited thereto.

In addition, in the first embodiment, the base plate 10 is stacked on the key backlight structure 20 (the light-emitting surface 202b of the light guide layer 202 ), and the base plate 10 can be made of, but not limited to, a metal plate in practical applications, which itself is not transparent. , the opening 102 can allow light to pass through, so in principle, it can provide a shielding function for the light guide layer 202 . On the other hand, in terms of structural logic, the base plate 10 can be used as an opaque shielding layer, and can also be regarded as a part of the key backlight structure 20 , which will not be further described. In addition, in practical applications, another member can also be used as an opaque shielding layer (which has an opening to expose the surface microstructure 202c and allow the light emitted from the light-emitting surface 202b to pass through), so as to provide the light guide layer 202. The light-emitting surface 202b has a shielding effect.

In addition, in the first embodiment, the key backlight structure 20 is stacked under the base plate 10 , but it is not limited to this in practical application. Please refer to FIG. 13 , its cross-sectional position corresponds to the position of the line X-X in FIG. 1 relative to the light-emitting key structure 1 . The light-emitting key structure 3 according to the second embodiment is similar in structure to the light-emitting key structure 1 , and the element symbols of the light-emitting key structure 1 are used in principle. Therefore, the relevant descriptions of the light-emitting key structure 1 and its changes are also applicable to the light-emitting key structure 3 , and will not be repeated here. The main difference between the light-emitting key structure 3 and the light-emitting key structure 1 is that the key backlight structure 20 of the light-emitting key structure 3 is located above the base plate 10 and below the thin film circuit board 17, and the light-emitting key structure 3 also includes an opaque shielding layer 32, stacked on the on the light guide layer 202 to shield light. The light-tight shielding layer 32 has an opening 322 through which the surface microstructure 202c is exposed, so that the light emitted from the light-guiding layer 202 can pass through the opening 322 to illuminate the light-transmitting indicator area 122 of the keycap 12, and the light-tight shielding Layer 32 can suppress the degree of light leakage. In practical applications, if the thin film circuit board 17 can provide the required shielding effect, the aforementioned light-tight shielding layer 32 can also be omitted (or its structure is integrated into the thin film circuit board 17 ).

To sum up, in the light-emitting button structure, the surface microstructure is provided on the light-emitting surface of the light guide layer of the button backlight structure to diffuse light and make it soft. Even if this light is received by the user's eyes, the degree of glare can be reduced. Compared with the prior art, the button backlight structure according to the present invention does not need to reduce the intensity of the backlight and excessively limit the range of the backlight provided by shielding, which can effectively reduce the impact of light leakage on the user's vision, and can maintain the light transmission indication of the keycap area provides effective lighting.

Certainly, the utility model also can have other various embodiments, under the situation of not departing from the spirit and essence of the utility model, those skilled in the art can make various corresponding changes and distortions according to the utility model, but these Corresponding changes and deformations should all belong to the scope of protection of the appended claims of the utility model.

Claims (10)

1. A key backlight structure is characterized in that the backlight structure comprises:

the light guide layer is provided with a bottom surface, a light emergent surface opposite to the bottom surface and at least one surface microstructure formed on the light emergent surface;

the reflecting layer is arranged below the light guide layer relative to the bottom surface; and

and the light-transmitting adhesive layer is tightly attached between the reflecting layer and the light guide layer corresponding to the surface microstructure.

2. The backlight structure of claim 1, wherein the at least one surface microstructure is located in a projection of the light-transmissive adhesive layer on the light-emitting surface; or the light-transmitting adhesive layer is distributed in a straight shape, a U shape, a reverse U shape or a square shape.

3. The key backlight structure of claim 1, wherein the light transmittance of the light-transmissive glue layer is greater than or equal to 90%.

4. The key backlight structure of claim 1, wherein a low reflection layer is formed on the surface of the reflection layer facing the light guide layer corresponding to the at least one surface microstructure.

5. The backlight structure of claim 4, wherein the low reflection layer is disposed in a shape of a Chinese character yi, U, n, or kou.

6. The backlight structure of claim 1, further comprising an opaque shielding layer overlying the light-emitting surface of the light guide layer, wherein the opaque shielding layer has at least one opening through which the at least one surface microstructure is exposed.

7. A light-emitting key structure, comprising:

a base plate;

the key backlight structure of any one of claims 1 to 5, stacked on or under the bottom plate;

the keycap is arranged above the bottom plate and is provided with a light-transmitting indication area; and

the supporting mechanism is connected between the base plate and the keycap, so that the keycap can move up and down relative to the base plate and the key backlight structure through the support of the supporting mechanism;

the light entering the light guide layer is emitted out of the light guide layer through the light emitting surface to irradiate the light transmission indicating area.

8. The light-emitting key structure of claim 7, wherein the bottom plate is stacked on the light-emitting surface of the light-guiding layer and has at least one opening, and the at least one surface microstructure is exposed through the at least one opening; or,

the at least one surface microstructure is positioned right below the light-transmitting indicating area.

9. The light-emitting key structure of claim 7, further comprising a light source for generating the light, wherein the light guiding layer has a light incident side surface between the bottom surface and the light emitting surface, and the light emitting surface of the light source faces the light incident side surface; or alternatively

The light-emitting key structure also comprises a light-proof shielding layer which is superposed on the light-emitting surface of the light guide layer, the light-proof shielding layer is provided with an opening, and the at least one surface microstructure is exposed through the opening.

10. The light-emitting key structure of claim 7, wherein the projection of the key cap on the light-emitting surface comprises a central region and a peripheral region surrounding the central region, and the at least one surface microstructure is located in the peripheral region.

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