Light guide

Abstract

The utility model discloses a light guide which comprises a front surface and a rear surface, a plurality of pattern units are arranged on the rear surface, each pattern unit comprises a first pattern surface and a second pattern surface, one end of each first pattern surface is connected with the rear surface, and the other end of each first pattern surface is connected with one end of the corresponding second pattern surface. The other end of the second pattern surface is connected with the rear surface, the first pattern surface is provided with a first reflecting film and / or the second pattern surface is provided with a first reflecting film, and the first reflecting film is located on the side, away from the front surface, of the rear surface. Incident light partially and directly reaches the surfaces of the pattern units, partially reaches the surfaces of the pattern units through one or more internal total reflection or reflection of the front surface and the rear surface, and reaches the front surface to be refracted and emitted after being reflected on the surfaces of the pattern units. Light smaller than a total reflection critical angle can be reflected and utilized on the surfaces of the pattern units, the utilization rate of the light is increased, and the lighting uniformity of the light guide can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile lamps, in particular to a light guide. Background Art

[0002] A light guide is a structural component that guides LED light to a specific location. When using a light guide, patterns are usually added to the back or leather grain is added to the surface of the light guide to destroy the total internal reflection and allow the light to exit. However, the added toothed pattern will have the following defects:

[0003] After some light with an angle smaller than the critical angle of total reflection is incident, it will be refracted directly out on one side;

[0004] Moreover, when the light is unidirectional, the refracted light will be biased towards the normal direction of the light-emitting surface, and very little on the other side, resulting in poor uniformity of the light guide;

[0005] This will result in that part of the light cannot be effectively utilized, and this part of the light that is not used (ie, the refracted light) will affect the uniformity of the overall lighting. Utility Model Content

[0006] The technical problem to be solved by the utility model is: in order to solve the technical problem of uneven lighting of existing light guides, the utility model provides a light guide, which can improve the uniformity of the lighting of the light guide by improving the light guide structure.

[0007] The technical solution adopted by the utility model to solve its technical problems is: a light guide, comprising: a front surface and a rear surface, the rear surface is provided with a plurality of pattern units, the pattern units include: a first pattern surface and a second pattern surface, one end of the first pattern surface is connected to the rear surface, the other end of the first pattern surface is connected to one end of the second pattern surface, the other end of the second pattern surface is connected to the rear surface, the first pattern surface is provided with a first reflective film and / or the second pattern surface is provided with the first reflective film, and the first reflective film is located on the side of the rear surface away from the front surface.

[0008] As a result, part of the incident light directly reaches the surface of the pattern unit, and part of the incident light reaches the surface of the pattern unit after one or more internal total reflections or reflections on the front and rear surfaces. After being reflected on the surface of the pattern unit, the incident light reaches the front surface and is refracted and emitted. This enables light that is less than the critical angle of total reflection to be reflected and utilized on the surface of the pattern unit, thereby improving the utilization rate of light and further improving the uniformity of the lighting of the light guide.

[0009] Furthermore, a semi-transmissive and semi-reflective film is provided on a side of the front surface away from the rear surface, thereby enabling the transmittance and reflectance of the front surface to be adjusted.

[0010] Furthermore, the pattern unit is located on a side of the rear surface close to the front surface.

[0011] Furthermore, the first pattern surface is a plane or a curved surface.

[0012] Furthermore, the second pattern surface is a plane or a curved surface.

[0013] Furthermore, the front surface and the rear surface are parallel to each other.

[0014] Furthermore, the front surface is a plane or a curved surface.

[0015] Furthermore, a second reflective film is provided on a side of the rear surface away from the front surface, thereby enabling the rear surface to have a reflective function.

[0016] Furthermore, it further comprises: a light homogenizer, which is located on the side of the front surface away from the rear surface. Thus, a more uniform light spot can be obtained through the light homogenizer, and a desired light spot can also be obtained.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] Part of the incident light directly reaches the surface of the pattern unit, and part of the incident light reaches the surface of the pattern unit after one or more internal total reflections or reflections on the front and rear surfaces. After being reflected on the surface of the pattern unit, the light reaches the front surface and is refracted and emitted. This enables light that is less than the critical angle of total reflection to be reflected and utilized on the surface of the pattern unit, thereby improving the utilization rate of the light and further improving the uniformity of the lighting of the light guide. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 This is a light path diagram of the utility model in which the rear surface is coated with a second reflective film and the pattern unit is coated with a first reflective film;

[0021] Figure 2 This is a light path diagram of the pattern unit of the utility model coated with the first reflective film;

[0022] Figure 3 This is a light path diagram of the utility model including a light homogenizer;

[0023] Figure 4 This is a light path diagram of the utility model in which the front surface is plated with a semi-transparent and semi-reflective film, the rear surface is plated with a second reflective film, and the pattern unit is plated with a first reflective film.

[0024] In the figure: 1, front surface; 101, semi-transparent and semi-reflective film; 2, rear surface; 201, second reflective film; 3, pattern unit; 301, first pattern surface; 302, second pattern surface; 303, first reflective film; 4, homogenizing sheet. DETAILED DESCRIPTION

[0025] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0026] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] like Figures 1 to 4As shown, it is the optimal embodiment of the utility model. The light guide of this embodiment includes: a front surface 1 and a rear surface 2. The rear surface 2 is provided with a plurality of pattern units 3. The pattern unit 3 includes: a first pattern surface 301 and a second pattern surface 302. One end of the first pattern surface 301 is connected to the rear surface 2, the other end of the first pattern surface 301 is connected to one end of the second pattern surface 302, and the other end of the second pattern surface 302 is connected to the rear surface 2. The first pattern surface 301 is plated with a first reflective film 303 and / or the second pattern surface 302 is plated with a first reflective film 303, and the first reflective film 303 is located on the side of the rear surface 2 away from the front surface 1. As a result, part of the incident light directly reaches the surface of the pattern unit, and part of the incident light reaches the surface of the pattern unit after one or more internal total reflections on the front and rear surfaces (that is, when the incident angle is greater than the critical angle, the light undergoes internal total reflection) or reflections (reflection refers to the reflection caused by the light being coated with the first reflective film on the front and rear surfaces). After being reflected on the surface of the pattern unit, the light reaches the front surface and is refracted and emitted. This enables the light that is less than the critical angle of total reflection to be reflected and utilized on the surface of the pattern unit, thereby improving the utilization rate of the light and further improving the uniformity of the lighting of the light guide.

[0029] Specifically, the first reflective film 303 can enable the pattern unit 3 to have a reflective function.

[0030] Specifically, when the light beam is incident from the top (i.e., incident from the side close to the first patterned surface 301), only the first patterned surface 301 needs to be plated with the first reflective film 303; when the light beam is incident from the bottom (i.e., incident from the side close to the second patterned surface 302), only the second patterned surface 302 needs to be plated with the first reflective film 303; when the light beam is incident from both the top and the bottom, both the first patterned surface 301 and the second patterned surface 302 need to be plated with the first reflective film 303.

[0031] Specifically, the front surface 1 is a light emitting surface; the refracted light is located on both sides of the light emitting direction, rather than on one side.

[0032] In this embodiment, a semi-transmissive and semi-reflective film 101 is coated on the side of the front surface 1 away from the rear surface 2. Thus, the transmittance and reflectance of the front surface 1 can be adjusted.

[0033] Specifically, when the transmittance ratio of the semi-transparent and semi-reflective film 101 is greater than the reflectance ratio, the transmission effect is enhanced, and when the transmittance ratio of the semi-transparent and semi-reflective film 101 is less than the reflectance ratio, the reflection effect is enhanced, thereby adjusting the light intensity.

[0034] Specifically, the side of the front surface 1 away from the rear surface 2 may not be processed.

[0035] In this embodiment, the front surface 1 and the rear surface 2 are parallel to each other, and the front surface 1 is a plane or a curved surface.

[0036] Specifically, if the front surface 1 is a plane, the rear surface 2 is also a plane; if the front surface 1 is a curved surface, the rear surface 2 is also a curved surface.

[0037] In this embodiment, the pattern unit 3 is located on the side of the rear surface 2 close to the front surface 1, the first pattern surface 301 is a plane or a curved surface, and the second pattern surface 302 is a plane or a curved surface. Specifically, the angles between the first pattern surfaces 301 and the second pattern surfaces 302 of the plurality of pattern units 3 are the same or different, the angles between the first pattern surfaces 301 and the rear surface 2 are the same or different, the angles between the second pattern surfaces 302 and the rear surface 2 are the same or different, and the angles between the normal lines of the first pattern surfaces 301 and the normal lines of the second pattern surfaces 302 of the plurality of pattern units 3 are the same or different; the arrangement of the plurality of pattern units 3 can be flexibly arranged according to the shape of the customer.

[0038] In this embodiment, a side of the rear surface 2 away from the front surface 1 is plated with a second reflective film 201. Thus, the rear surface 2 has a reflective function.

[0039] Specifically, when the incident light rays are parallel to each other and are incident at an angle greater than the critical angle of total reflection, the rear surface 2 does not need to be coated with a second reflective film 201. The incident light rays will be totally reflected by the front surface 1 and the rear surface 2, and then reach the pattern unit 3, and then be refracted and emitted (or the incident light rays directly reach the surface of the pattern unit 3 and are reflected and emitted).

[0040] In this embodiment, it further comprises: a light homogenizer 4, which is located on the side of the front surface 1 away from the rear surface 2. Thus, a more uniform light spot can be obtained through the light homogenizer 4, and a desired light spot can also be obtained.

[0041] The propagation process of light in the utility model is: a light source (not shown in the figure) is placed on one side of the light guide, and the light of the light source is divergent and propagated in all directions; after the light of the light source with a greater angle than the critical angle of total reflection is incident, this part of the light is emitted from the other side of the light guide after multiple total reflections between the front surface 1 and the rear surface 2; after the light of the light source with a less than critical angle of total reflection is incident, this part of the light is totally reflected once or multiple times, and then reaches the pattern surface, and after being reflected on the pattern surface, reaches the front surface 1 and is refracted and emitted; when the front surface 1 is coated with a semi-transparent and semi-reflective film 101, after the light of the light source with a less than critical angle of total reflection is incident, this part of the light will still be reflected on the front surface 1, and then reach the surface of the pattern unit 3 to be reflected, and finally reach the outer surface and be refracted and emitted.

[0042] To sum up, part of the incident light of the utility model directly reaches the surface of the pattern unit, and part reaches the surface of the pattern unit after one or more internal total reflection or reflection on the front and rear surfaces. After being reflected on the surface of the pattern unit, it reaches the front surface and is refracted and emitted, so that the light less than the critical angle of total reflection can be reflected and utilized on the surface of the pattern unit, thereby improving the utilization rate of the light and further improving the uniformity of the lighting of the light guide.

[0043] The above description is based on the ideal embodiment of the utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A light guide, characterized in that include: a front surface (1), and A rear surface (2), wherein the rear surface (2) is provided with a plurality of pattern units (3), and the pattern units (3) include: A first patterned surface (301) and a second patterned surface (302), wherein one end of the first patterned surface (301) is connected to the rear surface (2), the other end of the first patterned surface (301) is connected to one end of the second patterned surface (302), the other end of the second patterned surface (302) is connected to the rear surface (2), the first patterned surface (301) is provided with a first reflective film (303) and / or the second patterned surface (302) is provided with the first reflective film (303), and the first reflective film (303) is located on a side of the rear surface (2) away from the front surface (1).

2. The light guide according to claim 1, characterized in that A semi-transparent and semi-reflective film (101) is provided on a side of the front surface (1) away from the rear surface (2).

3. The light guide according to claim 1, characterized in that The pattern unit (3) is located on a side of the rear surface (2) close to the front surface (1).

4. The light guide according to claim 1, characterized in that The first patterned surface (301) is a plane or a curved surface.

5. The light guide according to claim 1, characterized in that The second patterned surface (302) is a flat surface or a curved surface.

6. The light guide according to claim 1, characterized in that The front surface (1) and the rear surface (2) are parallel to each other.

7. The light guide according to claim 1, characterized in that The front surface (1) is a plane or a curved surface.

8. The light guide according to claim 1, characterized in that A second reflective film (201) is provided on a side of the rear surface (2) away from the front surface (1).

9. The light guide according to claim 1, characterized in that Also includes: A light homogenizer (4), the light homogenizer (4) being located on a side of the front surface (1) away from the rear surface (2).

Images