Key light guide plate
By setting key holes, fill holes and split holes on the light guide plate, and using the key cover plate to reflect light, the problem of uneven brightness of the key is solved, and the uniform brightness of the thin light guide plate is achieved, reducing costs.
Patent Information
- Application Number
- CN202422382046.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-29
AI Technical Summary
The existing key light guide plates have uneven brightness in different areas, resulting in poor user experience and increasing thickness to solve the problem of uneven brightness will increase costs.
Multiple key holes, fill holes and split holes are set on the light guide plate. Through total reflection and reflection of light, combined with the reflection of the key cover plate, the light is evenly distributed and ensures uniform brightness of the key.
Without increasing the thickness of the light guide plate, uniformity of the key brightness is achieved, and production costs and equipment thickness are reduced.
Smart Images
Figure CN223078499U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of lighting, and more specifically to a key light guide plate. Background Art
[0002] In electronic devices such as mobile phones and POS machines, the use of key light guide plates is very common. Generally, LED lamp beads are used as the light source for the key light guide plate. The light emitted by the light source is refracted or reflected on the light guide plate to make the keys emit light at the key positions.
[0003] However, after the light passes through the refraction or reflection of the light guide plate, there may be a problem of different brightness in areas at different distances from the light source, resulting in uneven brightness on the entire key panel and affecting the use experience.
[0004] Due to the above defects, in order to ensure uniform brightness of each key, in the prior art, a relatively thick light guide plate is used to ensure that the light can reach each key evenly. However, the relatively thick light guide plate will increase the thickness and cost of the entire electronic device with the light guide plate. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a key light guide plate with a relatively thin structure and uniform key brightness.
[0006] To achieve the above object, the solution of the utility model is:
[0007] A key light guide plate is provided under a key cover plate, which includes a plurality of key holes formed on a light guide plate body, and a plurality of light supplement holes and a plurality of light splitting holes are also formed on the light guide plate body; at least one side of the light guide plate body is provided with a light source. The key hole close to the light source is a near-light-source key hole, and the key hole far from the light source is a far-light-source key hole; light supplement holes are distributed around the far-light-source key hole, and the side wall of the light supplement hole reflects the light into the far-light-source key hole; the light splitting holes are distributed around the near-light-source key hole of the light guide plate body, and total internal reflection occurs on the side wall of the light splitting hole; the key cover plate reflects the light of the light source into the near-light-source key hole.
[0008] Further, at least one light inlet groove is respectively provided on two opposite sides of the light guide plate body, and a light source is provided in each light inlet groove. The key holes corresponding to both sides of the light inlet groove are near-light-source key holes, and the key holes located inside the near-light-source key holes and relatively far from the light inlet groove relative to the near-light-source key holes are far-light-source key holes.
[0009] Further, one side of the near-light-source key hole is close to the light inlet groove, and light supplement holes are also distributed in the outer side relatively far from the light inlet groove.
[0010] Further, a plurality of light supplement holes are distributed around the far-light-source key hole, and the light supplement holes surrounding the same far-light-source key hole reflect the light towards the far-light-source key hole.
[0011] Furthermore, the shape of the supplementary light hole is such that one long side of a rectangle or the hypotenuse of a right trapezoid is concavely provided to be parallel to the hole wall of the far light source key hole surrounded by the supplementary light hole.
[0012] Furthermore, the incident angle of the side wall of the light splitting hole close to the light source is greater than the total reflection critical angle of the incident light.
[0013] Furthermore, the light splitting hole is triangular.
[0014] Furthermore, the thickness of the main body of the light guide plate is 1.2 mm.
[0015] Furthermore, the key cover plate is light-impermeable, and both the back surface and the front surface of the main body of the light guide plate are smooth planes.
[0016] Furthermore, a plurality of mounting holes are also provided on the main body of the light guide plate.
[0017] After adopting the above technical solutions, the utility model has at least the following technical effects:
[0018] The light is initially distributed through the light splitting hole and the supplementary light hole. The supplementary light hole is arranged around the far light source key hole, so that the brightness of the far light source key hole on the initial light guide plate is higher than that of the near light source key hole; then, the key cover plate of the electronic device is used to cover the light guide plate to participate in the secondary light distribution, and the light of the light source is reflected into the near light source key hole to supplement the brightness. Thus, the overall key brightness is made uniform.
[0019] On the basis of the above structure, there is no need to achieve uniform light distribution and uniform key brightness by increasing the thickness of the light guide plate as in the background art. The uniform key brightness can be achieved on the premise that the main body structure of the light guide plate is relatively thin, and the production cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 It is a three-dimensional structure diagram of the main body of the light guide plate of the utility model;
[0021] Figure 2 It is a front view of the main body of the light guide plate of the utility model;
[0022] Figure 3 It is a back view of the main body of the light guide plate of the utility model;
[0023] Figure 4 It is a side view of the main body of the light guide plate of the utility model;
[0024] Figure 5 It is a schematic diagram of the light source distribution of the utility model;
[0025] Figure 6 It is a partial light path diagram of the light guide plate of the utility model;
[0026] Figure 7 Schematic diagram of brightness distribution of the light guide plate of the present utility model;
[0027] Figure 8 Schematic diagram of brightness distribution after the light guide plate of the present utility model covers the button cover plate;
[0028] Explanation of reference numerals in the drawings: 1 light guide plate main body; 11 button holes; 111 near-light-source button holes; 112 far-light-source button holes; 12 light supplement holes; 13 light splitting holes; 14 light inlet grooves; 15 mounting holes; 2 light source. Specific embodiments
[0029] In order to further explain the technical solution of the present utility model, the present utility model will be elaborated in detail below through specific embodiments.
[0030] The present utility model provides a button light guide plate, which is mainly used under the button cover plate of electronic devices such as mobile phones and POST machines, and is used to make the light emitted by the light source 2 refract or reflect on the light guide plate to make the button emit light at the button part.
[0031] Refer to Figure 1-4 As shown, it is a preferred embodiment of the present utility model, including a plurality of button holes 11 provided on the light guide plate main body 1, and a plurality of light supplement holes 12 and a plurality of light splitting holes 13 are further formed on the light guide plate main body 1. Among them, at least one side of the light guide plate main body 1 is provided with a light source 2. The button hole 11 close to the light source 2 is a near-light-source button hole 111, and the button hole 11 far from the light source 2 is a far-light-source button hole 112. At least one light supplement hole 12 is distributed around the far-light-source button hole 112, and the side wall of the light supplement hole 12 can reflect the light into the far-light-source button hole 112. The light splitting holes 13 are distributed around the near-light-source button holes 111 of the light guide plate main body 1, and total internal reflection occurs on the side wall of the light splitting holes 13. Finally, the button cover plate can reflect the light of the light source 2 into the near-light-source button hole 111 to achieve consistent button brightness.
[0032] Further refer to Figure 5 , at least one light inlet groove 14 is respectively provided on two opposite sides of the light guide plate main body 1. In this embodiment, three are provided. The button holes 11 provided on both sides of the light inlet groove 14 are near-light-source button holes 111, and the button holes located inside the near-light-source button holes 111 and relatively far from the light inlet groove 14 from the near-light-source button holes are far-light-source button holes 112. Most of the plurality of button holes located in the middle of the light guide plate main body are far-light-source button holes 112.
[0033] In this embodiment, 15 button holes 11 are arranged in four rows on the light guide plate body 1, and light entrance slots 14 are arranged beside the button holes 11 in the first and fourth rows, that is, the button holes 11 in the first and fourth rows are low light button holes 111, and the button holes 11 in the second and third rows are high light button holes 112. Figure 2 As shown, in the first and fourth rows, one side (inner side) of the first low light source button holes 111 located on both sides of the row is close to the light entrance slot 14 , and fill light holes 12 may also be distributed on the outer side relatively away from the light entrance slot 14 .
[0034] According to the distance between each high light source button hole 112 and the light source 2 and the actual brightness, different numbers and shapes of fill light holes 12 can be optionally provided around the high light source button hole 112, that is, multiple fill light holes 12 can be distributed around one high light source button hole 112, and these fill light holes 12 surrounding the same high light source button hole 112 reflect light into the high light source button hole 112 they surround, thereby providing brightness for the high light source button hole 112.
[0035] The shape of the fill light hole 12 is not limited, and the shapes of the fill light holes 12 corresponding to different high light source button holes 112 do not need to be the same. It is only necessary that the side wall of the fill light hole 12 can reflect light into the designated high light source button hole 112. The shape of the fill light hole can be a shape that is concavely set in one of the long sides of a rectangle or the hypotenuse of a right-angled trapezoid to be parallel to the hole wall of the high light source button hole surrounded by the fill light hole, forming an irregular shape. In this embodiment, the button hole is circular, and the fill light hole 12 is a concave arc formed by concavely setting the hypotenuse of a right-angled trapezoid to correspond to the outer side of the high light source button hole 112.
[0036] The spectroscopic holes 13 are correspondingly arranged beside each light entrance slot 14, and are arranged corresponding to the light source 2. The function of the spectroscopic holes 13 is to distribute the light from the light source 2 to various places in the light guide plate body 1 through total reflection, so that the fill light hole 12 can fill the light received by the high light source button hole 112 that needs more light. Therefore, the shape of the spectroscopic holes 13 is not limited, and the shapes of each spectroscopic hole 13 on the same light guide plate body 1 do not need to be consistent. It only needs to satisfy the requirement that the light from the light source 2 can be distributed to various places in the light guide plate body 1 through total reflection of the side wall of the spectroscopic hole 13. The incident angle of the side wall of the spectroscopic hole 13 close to the light source 2 is greater than the critical angle of total reflection of the incident light. The spectroscopic hole 13 in this embodiment is a triangle, and the light distribution can be adjusted by the position of the triangle and the slope of the side.
[0037] Based on the above structure, the light emitted by the light source 2 is initially distributed in the light guide plate body 1, and then secondarily distributed through the key cover plate covering the light guide plate body 1, so as to achieve uniform brightness of the overall keys. The implementation process is as follows:
[0038] 1. In the initial distribution, refer toFigure 6 After the light rays of the light source 2 enter the light guide plate body 1, they are first distributed to various parts of the light guide plate body 1 by total reflection on the side wall of the light splitting hole 13, and then the light rays are reflected and concentrated into each far light source key hole 112 through the side wall of the light supplement hole 12. At this time, more light rays are distributed to the far light source key hole 112 than to the near light source key hole 111. As Figure 7 shown, at this time, the brightness of the far light source key hole 112 is higher than that of the near light source key hole 111.
[0039] 2. In the secondary distribution, a key cover plate (not shown in the figure) is covered on the light guide plate body 1. The key cover plate is light-tight and can participate in the light distribution. Since the near light source key hole 111 is relatively close to the light source 2, the light rays of the light source 2 can enter the near light source key hole 111 after being reflected by the key cover plate, supplementing the brightness of the near light source key hole 111. As Figure 8 shown, after covering the key cover plate, the brightness of the far light source key hole 112 and the near light source key hole 111 is uniform, and the overall brightness of the keys is uniform.
[0040] Therefore, the present utility model does not need to achieve uniform light distribution and uniform key brightness by increasing the thickness of the light guide plate as in the background art. In this embodiment, the thickness of the light guide plate body 1 can be only 1.2 mm, reducing the production cost of the light guide plate and the cost and thickness of the electronic device including the light guide plate.
[0041] Preferably, both the back surface and the front surface of the light guide plate body 1 are smooth planes, thereby reducing surface diffuse reflection and reducing light loss.
[0042] Preferably, a plurality of mounting holes 15 are further provided on the light guide plate body 1 for mounting the light guide plate body 1 in the electronic device.
[0043] The above is only one embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.
Claims
1. A key light guide plate is disposed under the key cover plate, and is characterized in that: The light guide plate body is provided with a plurality of key holes, and a plurality of light supplement holes and a plurality of light splitting holes are also formed on the light guide plate body; at least one side of the light guide plate body is provided with a light source, the key hole close to the light source is a near-light-source key hole, and the key hole far from the light source is a far-light-source key hole; light supplement holes are distributed around the far-light-source key hole, and the side wall of the light supplement hole reflects light into the far-light-source key hole. The light splitting holes are distributed around the near-light-source key hole of the light guide plate body, and total internal reflection occurs on the side wall of the light splitting hole; the key cover plate reflects the light from the light source into the near-light-source key hole.
2. The key light guide plate according to claim 1, characterized in that: At least one light inlet groove is respectively provided on two opposite sides of the light guide plate body, a light source is provided in each light inlet groove, the key holes corresponding to both sides of the light inlet groove are near-light-source key holes, and the key holes located inside the near-light-source key holes and relatively far from the light inlet groove away from the near-light-source key holes are far-light-source key holes.
3. The key light guide plate according to claim 2, characterized in that: One side of the near-light-source key hole is close to the light inlet groove, and light supplement holes are also distributed on the outer side of the side relatively far from the light inlet groove.
4. A key light guide plate according to claim 1 or 2, characterized in that: A plurality of light supplement holes are distributed around the far-light-source key hole, and the light supplement holes surrounding the same far-light-source key hole reflect light towards the far-light-source key hole.
5. A key light guide plate according to claim 1 or 2, characterized in that: The shape of the light supplement hole is such that one long side of a rectangle or the hypotenuse of a right trapezoid is concavely provided to be parallel to the hole wall of the far-light-source key hole surrounded by the light supplement hole.
6. The key light guide plate according to claim 1 or 2, characterized in that: The incident angle of the side wall of the light splitting hole close to the light source is greater than the total internal reflection critical angle of the incident light.
7. The key light guide plate according to claim 6, wherein: The light splitting hole is triangular.
8. A key light guide plate according to claim 1, characterized in that: The thickness of the light guide plate body is 1.2 mm.
9. The key light guide plate according to claim 1, wherein: The key cover plate is light-tight, and both the back and the front of the light guide plate body are smooth planes.
10. A key light guide plate according to claim 1, characterized in that: A number of mounting holes are also provided on the light guide plate body.