CN202710775U - Light guide plate and button device with same - Google Patents
Light guide plate and button device with same Download PDFInfo
- Publication number
- CN202710775U CN202710775U CN 201220254283 CN201220254283U CN202710775U CN 202710775 U CN202710775 U CN 202710775U CN 201220254283 CN201220254283 CN 201220254283 CN 201220254283 U CN201220254283 U CN 201220254283U CN 202710775 U CN202710775 U CN 202710775U
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- China
- Prior art keywords
- reflection
- guide plate
- light guide
- plate body
- light
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model discloses a light guide plate and a button device with the same. The light guide plate comprises a light guide plate body which is provided with a light-in surface and light-out surfaces. The light guide plate body is provided with a reflection groove which is disposed right above the light-in surface. The reflection groove is in a shape of pyramid which is bigger on an upper part and smaller on a lower part. The light guide plate body is also provided with a plurality of reflecting sections which are inclined arranged. The light-out surfaces are disposed right above the reflecting sections. Through using design of the reflection groove and the reflecting sections, rays given out by a single LED light source form multipoint luminescence through being reflected by the different reflecting sections, so that a plurality of buttons are lighted up, thereby reducing usage amount of the LED light sources and reducing production cost of the button device. Through reasonably setting an angle between a reflection groove's side wall and an upper surface of the light guide plate body and using a total reflection principle, loss of rays is reduced, and luminance of a plurality of points is ensured to be constant.
Description
Technical field
The key device that the utility model relates to light guide plate and has this light guide plate.
Background technology
Often adopt LED lamp pearl as light source in the key device, and be provided with light guide plate in led light source one side.The light that led light source sends shines light guide plate, and in light guide plate refraction or reflection occurs, with position, directive key number place.Yet existing light guide plate is subjected to structural limitations, causes single led light source can only illuminate single button, and several buttons just need to adopt several led light sources, has increased the cost of manufacture of key device.
The utility model content
For the deficiencies in the prior art, one of the purpose of this utility model is to provide a kind of light guide plate, by adopting the design of reflection groove and reflection tangent plane, the light that single led light source is sent reflects to form the Multi-point luminous phenomenon through difference reflection tangent plane, can be convenient to illuminate several buttons, thereby reduce the use amount of led light source.
Two of the purpose of this utility model is to provide a kind of key device with this light guide plate.
For achieving the above object one, the utility model adopts following technical scheme:
Light guide plate comprises light conducting plate body, and light conducting plate body is provided with incidence surface, exiting surface; Also be provided with the reflection groove that is positioned at directly over the incidence surface on this light conducting plate body, the pyramid-shaped that described reflection groove is big up and small down, also be provided with the reflection tangent plane that several are obliquely installed on this light conducting plate body, described reflection tangent plane is corresponding with the side of reflection groove respectively, and the reflection tangent plane is positioned at the outside with its corresponding side surface; Described exiting surface be positioned at the reflection tangent plane directly over.
The reflection tangent plane is parallel to the side corresponding with it.
The lower end of light conducting plate body is provided with downward opening container cavity, and described incidence surface is the inner roof wall of container cavity.
Be equipped with projection directly over the described reflection tangent plane, described exiting surface is the upper surface of projection.
Described reflection groove is positive tetrapyamid shape, and the angle between the side of reflection groove and the light conducting plate body upper surface is 45 °.
For achieving the above object two, the utility model adopts following technical scheme:
Key device with this light guide plate comprises circuit board, light guide plate, is connected to the single led light source on the circuit board, and described light guide plate comprises light conducting plate body, and light conducting plate body is provided with incidence surface, exiting surface; Also be provided with the reflection groove that is positioned at directly over the incidence surface on this light conducting plate body, the pyramid-shaped that described reflection groove is big up and small down, also form the reflection tangent plane that several are obliquely installed on this light conducting plate body, described reflection tangent plane is corresponding with the side of reflection groove respectively, and the reflection tangent plane is positioned at the outside with its corresponding side surface; Described exiting surface be positioned at the reflection tangent plane directly over; Described led light source be positioned at incidence surface under.
The beneficial effects of the utility model are:
By adopting the design of reflection groove and reflection tangent plane, the light that single led light source is sent reflects to form the Multi-point luminous phenomenon through difference reflection tangent plane, can be convenient to illuminate several buttons, thereby reduce the use amount of led light source, reduce the cost of manufacture of key device; By the angle of reflection groove side and light conducting plate body upper surface rationally is set, and utilize total reflection principle, can reduce the loss of light, and guarantee that the brightness of several points is consistent.
Description of drawings
Fig. 1 is the structural representation of the utility model light guide plate;
Fig. 2 is the cut-open view of light guide plate shown in Figure 1;
Fig. 3 is the structural representation of the utility model key device;
Fig. 4 is the ray trajectory figure of key device shown in Figure 3;
Wherein, 1, light conducting plate body; 2, reflection groove; 3, reflection tangent plane; 4, container cavity; 41, incidence surface; 5, projection; 51, exiting surface; 6, circuit board; 7, led light source.
Embodiment
Below, by reference to the accompanying drawings and embodiment, the utility model is described further, so that clearerly understand the utility model technical thought required for protection.
As shown in Figure 1, 2, for a kind of light guide plate of the utility model, comprise light conducting plate body 1, light conducting plate body 1 is provided with incidence surface 41, exiting surface 51.Concrete, the lower end of light conducting plate body 1 is provided with downward opening container cavity 4, and described incidence surface 41 is the inner roof wall of container cavity 4.The upper surface of described light conducting plate body 1 is provided with projection 5, and described exiting surface 51 is the upper surface of projection 5.
Also be provided with the reflection groove 2 that is positioned at directly over the incidence surface 41 on this light conducting plate body 1, the positive tetrapyamid shape that described reflection groove 2 is big up and small down.Also be provided with four reflection tangent planes 3 that are obliquely installed on the outer wall of this light conducting plate body 1, described reflection tangent plane 3 is corresponding with the side of reflection groove 2 respectively, and reflection tangent plane 3 is positioned at the outside with its corresponding side surface.Preferably, reflection tangent plane 3 is parallel to the side corresponding with it.And corresponding, be provided with four projections 5 on this light guide plate, described projection 5 is corresponding one by one with reflection tangent plane 3, and lay respectively at corresponding with it reflect tangent plane 3 directly over.Described exiting surface 51 be positioned at the reflection tangent plane 3 directly over.
For the ease of forming total reflection phenomenon, the angle theta between the side of described reflection groove 2 and light conducting plate body 1 upper surface is 45 °.Because reflection tangent plane 3 is parallel to the side corresponding with it, the angle between reflection tangent plane 3 and light conducting plate body 1 upper surface also is 45 °.
Certainly, the shape of described reflection groove 2 is not limited in tetrapyamid shape, also can be set to other pyramid-shaped such as pentagonal pyramid, hexagonal pyramid, but reflection groove 2 is set to tetrapyamid shape according to actual conditions, is the utility model preferred forms.And the quantity of reflection tangent plane 3 should be complementary with the side of reflection groove 2, and corresponding one by one.Similar therewith, the quantity of projection 5 should be complementary with reflection tangent plane 3, and corresponding one by one.
As shown in Figure 3, for a kind of key device of the utility model, comprise above-mentioned light guide plate.This key device also comprises circuit board 6, is connected to the single led light source 7 on the circuit board 6, described led light source 7 be positioned at incidence surface 41 under.Concrete, described led light source 7 is positioned at container cavity 4.
As shown in Figure 4, be the ray trajectory figure of the utility model key device, the light that led light source 7 sends is injected from incidence surface 41, and the side of vertical directive reflection groove 2, because the incident angle of this light is greater than critical angle, total reflection occurs in the side of reflection groove 2 in light; Similar therewith, when reflection ray horizontal sheaf reflection tangent plane 3, because the incident angle of this reflection ray is greater than critical angle, total reflections occur at reflection tangent plane 3 in light, and penetrate from the upper surface of projection 5.Owing to adopted the design of several reflection tangent planes 3, make light form the Multi-point luminous phenomenon through difference reflection tangent plane 3, so that illuminate several buttons, reduce the use amount of led light source 7.And, by utilizing total reflection principle, can reduce the loss of light, and guarantee that the brightness of several points is consistent.
To one skilled in the art, can according to technical scheme described above and design, make other various corresponding changes and deformation, and these all changes and deformation should belong within the protection domain of the utility model claim all.
Claims (6)
1. light guide plate, it is characterized in that: comprise light conducting plate body, light conducting plate body is provided with incidence surface, exiting surface; Also be provided with the reflection groove that is positioned at directly over the incidence surface on this light conducting plate body, the pyramid-shaped that described reflection groove is big up and small down, also be provided with the reflection tangent plane that several are obliquely installed on this light conducting plate body, described reflection tangent plane is corresponding with the side of reflection groove respectively, and the reflection tangent plane is positioned at the outside with its corresponding side surface; Described exiting surface be positioned at the reflection tangent plane directly over.
2. light guide plate as claimed in claim 1 is characterized in that: reflect tangent plane and be parallel to the side corresponding with it.
3. light guide plate as claimed in claim 1 or 2, it is characterized in that: the lower end of light conducting plate body is provided with downward opening container cavity, and described incidence surface is the inner roof wall of container cavity.
4. light guide plate as claimed in claim 1 or 2, it is characterized in that: be equipped with projection directly over the described reflection tangent plane, described exiting surface is the upper surface of projection.
5. light guide plate as claimed in claim 1 or 2, it is characterized in that: described reflection groove is positive tetrapyamid shape, and the angle between the side of reflection groove and the light conducting plate body upper surface is 45 °.
6. the key device that has light guide plate claimed in claim 1 comprises circuit board, light guide plate, is connected to the single led light source on the circuit board, and it is characterized in that: described light guide plate comprises light conducting plate body, and light conducting plate body is provided with incidence surface, exiting surface; Also be provided with the reflection groove that is positioned at directly over the incidence surface on this light conducting plate body, the pyramid-shaped that described reflection groove is big up and small down, also form the reflection tangent plane that several are obliquely installed on this light conducting plate body, described reflection tangent plane is corresponding with the side of reflection groove respectively, and the reflection tangent plane is positioned at the outside with its corresponding side surface; Described exiting surface be positioned at the reflection tangent plane directly over; Described led light source be positioned at incidence surface under.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220254283 CN202710775U (en) | 2012-05-31 | 2012-05-31 | Light guide plate and button device with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220254283 CN202710775U (en) | 2012-05-31 | 2012-05-31 | Light guide plate and button device with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202710775U true CN202710775U (en) | 2013-01-30 |
Family
ID=47591063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220254283 Expired - Fee Related CN202710775U (en) | 2012-05-31 | 2012-05-31 | Light guide plate and button device with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202710775U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104658797A (en) * | 2013-11-22 | 2015-05-27 | 富泰华精密电子（郑州）有限公司 | Side key device of mobile terminal |
-
2012
- 2012-05-31 CN CN 201220254283 patent/CN202710775U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104658797A (en) * | 2013-11-22 | 2015-05-27 | 富泰华精密电子（郑州）有限公司 | Side key device of mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20150531 |
|
| EXPY | Termination of patent right or utility model |