Thick-walled light guide with uniform luminous intensity and optical system

Abstract

The utility model discloses a thick wall light guide and optical system of luminous intensity uniformity, wherein, the light inlet structure of thick wall light guide includes the light inlet band of extending along the light guide body length direction and the light receiving convex rib of symmetrically convexly formed in the light inlet band width direction two sides. Adopt above thick wall light guide and optical system of luminous intensity uniformity, and the light inlet band can receive the most light of LED lamp pearl emission, and through the light receiving surface of adding on the both sides of light inlet band, receive the large angle light of LED lamp pearl emission, and the light of from the light receiving surface enters again after the reflection of reflection surface and emits to the light emitting band, not only effectively improved the luminous intensity of light emitting band, and make the light efficiency of light emitting band very uniform, will not appear obvious bright area and dark area, solved the problem of traditional spotlight light inlet uniformity.

Description

Technical Field

[0001] This utility model relates to the field of lamp component technology, specifically to a thick-walled light guide and optical system with uniform luminous brightness. Background Technology

[0002] Please see Figure 1 In order to improve the luminous brightness, existing thick-walled light guides for exterior lights usually have a condenser 14 on the light-inlet surface that corresponds to one of the LED beads, so as to improve the light collection efficiency of the light emitted by the LED beads.

[0003] While the above design improves the brightness of the light guide, the concentrator causes poor uniformity of light emission. Bright spots appear at the positions of the light-emitting band directly opposite each concentrator, and there are obvious dark areas between adjacent spots.

[0004] Solving these problems is now a top priority. Utility Model Content

[0005] In view of this, the present invention provides a thick-walled light guide and optical system with uniform light emission brightness.

[0006] The technical solution is as follows:

[0007] The first aspect of this application relates to a thick-walled light guide with uniform luminous brightness, comprising a light guide body in the form of a plate, one side edge of the light guide body being a light-inlet structure, and the side edge of the light guide body opposite to the light-inlet structure being a light-emitting strip. The light-inlet structure includes a light-inlet strip extending along the length direction of the light guide body and light-receiving ribs symmetrically protruding on both sides of the width direction of the light-inlet strip. The two side walls of the light-receiving ribs near and away from the light-inlet strip are respectively a light-receiving surface and a reflective surface. The light-receiving surface gradually slopes outward from the root in a direction away from the normal of the light-emitting strip, and the distance between the reflective surface and the light-receiving surface gradually decreases outward from the root.

[0008] By using the above-mentioned thick-walled light guide with uniform luminous brightness, the light-inlet strip can receive most of the light emitted by the LED beads. Then, by adding light-receiving surfaces on both sides of the light-inlet strip, the light emitted by the LED beads at large angles is received. The light entering from the light-receiving surfaces is reflected by the reflective surfaces and then emitted towards the light-emitting strip. This not only effectively improves the luminous brightness of the light-emitting strip, but also makes the light effect of the light-emitting strip very uniform, without obvious bright and dark areas, thus solving the problem of poor light uniformity of traditional concentrators.

[0009] In some embodiments, the light-incoming strip is an arc-shaped structure with a protrusion height that gradually increases towards the center, and the normal of the light-incoming strip coincides with the normal of the light-emitting strip.

[0010] In some embodiments, the reflecting surface is an outwardly convex total reflection surface.

[0011] In some embodiments, the light-emitting band consists of an array of recessed pits.

[0012] In some embodiments, several positioning and mounting structures are integrally formed on one or both sidewalls of the optical guide body in the thickness direction.

[0013] In some embodiments, the thickness of the light guide body gradually decreases from the end where the light-inlet structure is provided to the section where the light-emitting strip is provided.

[0014] The second aspect of this application relates to an optical system, including a PCBA and the aforementioned thick-walled light guide with uniform light emission brightness. The PCBA integrates multiple LED beads distributed along the length of the light-inlet band, with the light-emitting surface of each LED bead located at the center between two light-receiving surfaces and facing the light-inlet band.

[0015] The above optical system possesses all the advantages of the thick-walled light guide with uniform light emission brightness.

[0016] In some implementations, the LED beads are evenly distributed along a straight line. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an existing optical guide that uses a condenser lens;

[0018] Figure 2 This is a schematic diagram of the thick-walled optical guide of this utility model from one perspective;

[0019] Figure 3 This is a structural schematic diagram of the thick-walled optical guide of this utility model from another perspective;

[0020] Figure 4 This is a schematic diagram of the optical path of the thick-walled optical guide of this utility model. Detailed Implementation

[0021] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0022] Example 1:

[0023] like Figures 2-4 As shown, a thick-walled light guide with uniform luminous brightness mainly includes a light guide body 1, which has a plate-like structure. For the circumferential side edges in the thickness direction of the light guide body 1, the two opposite side edges of the light guide body 1 are the light-inlet structure 11 and the light-emitting band 12, respectively, that is: the light-inlet structure 11 is directly opposite the light-emitting band 12.

[0024] In this embodiment, the light-gathering structure 11 includes a light-gathering strip 111 extending along the length of the light guide body 1 and light-receiving ribs 112 symmetrically protruding on both sides of the width of the light-gathering strip 111, so that the light-gathering strip 111 and the light-receiving ribs 112 on both sides together form an elongated U-shaped groove extending along the length of the light guide body 1. Furthermore, the side wall of the light-receiving rib 112 near the light-gathering strip 111 is a light-receiving surface 112a, and the side wall of the light-receiving rib 112 away from the light-gathering strip 111 is a reflective surface 112b. The light-receiving surface 112a gradually tilts away from the normal of the light-emitting strip 12 from the root outwards, and the distance between the reflective surface 112b and the light-receiving surface 112a gradually decreases from the root outwards, so that the light-receiving rib 112 is approximately a triangular prism structure.

[0025] Therefore, most of the light emitted by the LED beads is received through the light-inlet strip 111, and then the large-angle light emitted by the LED beads is received through the light-receiving surfaces 112a added on both sides of the light-inlet strip 111. Furthermore, the light entering from the light-receiving surface 112a is reflected by the reflective surface 112b and then directed to the light-emitting strip 12 for emission. This not only effectively improves the luminous brightness of the light-emitting strip 12, but also makes the luminous efficiency of the light-emitting strip 12 very uniform, without obvious bright and dark areas, thus solving the problem of poor light uniformity in traditional concentrators.

[0026] Furthermore, the light-inlet band 111 is an arc-shaped structure with a protrusion height that gradually increases towards the center, so that the light entering from the light-inlet band 111 is focused towards the light-emitting band 12. In addition, the normal of the light-inlet band 111 coincides with the normal of the light-emitting band 12. This design can effectively improve the luminous brightness of the light-emitting band 12.

[0027] Further, please see Figure 4 The reflecting surface 112b is an outwardly convex total internal reflection surface, which enables the light entering from the light receiving surface 112a to be totally internally reflected on the reflecting surface 112b, avoiding light escape and further improving the luminous brightness of the light emitting band 12.

[0028] In this embodiment, the light-receiving surface 112a can be an inclined surface structure or a concave surface structure, as long as it can allow as much light as possible to enter and work with the reflecting surface 112b to achieve total internal reflection.

[0029] Furthermore, the thickness of the light guide body 1 gradually decreases from the end where the light-inlet structure 11 is provided to the section where the light-emitting strip 12 is provided, thereby enabling the light-inlet structure 11 to receive as much light as possible and effectively conduct it to the light-emitting strip 12, further improving the luminous brightness of the light-emitting strip 12.

[0030] Furthermore, the light-emitting band 12 is composed of an array of pits 121, which are very small in area and densely distributed. This design further improves the uniformity of light emission from the light-emitting band 12 and avoids the problem of bright and dark areas.

[0031] Furthermore, several positioning and mounting structures 13 are integrally formed on one or both sidewalls in the thickness direction of the optical guide body 1. By adding positioning and mounting structures 13, the stability and reliability of the assembly of the optical guide body 1 are ensured.

[0032] Example 2:

[0033] An optical system includes a PCBA and a thick-walled light guide with uniform light emission brightness as described in Embodiment 2. The PCBA integrates multiple LED beads distributed along the length of the light-inlet band 111. The light-emitting surface of each LED bead is located at the center between two light-receiving surfaces 112a, and the light-emitting surface of each LED bead is directly facing the light-inlet band 111, thus ensuring the light emission brightness of the light-emitting band 12.

[0034] Furthermore, the LED beads are evenly distributed along a straight line, which can effectively improve the uniformity of light emission from the light-emitting band 12 and avoid the problem of bright and dark areas.

[0035] Furthermore, since the light-inlet strip 111 and the light-receiving ribs 112 on both sides together form a long strip U-shaped groove extending along the length of the light guide body 1, each LED bead in this embodiment is preferably designed to be located in the long strip U-shaped groove, thereby allowing more light to enter from the light-inlet strip 111 and the light-receiving ribs 112, thus improving the luminous brightness of the light-emitting strip 12.

[0036] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A thick-walled light guide with uniform luminous intensity, comprising a light guide body in the form of a plate, wherein one side edge of the light guide body is a light-inlet structure, and the side edge of the light guide body opposite to the light-inlet structure is a light-emitting strip, characterized in that: The light-gathering structure includes a light-gathering band extending along the length of the light guide body and light-receiving ribs symmetrically protruding on both sides of the width of the light-gathering band. The side walls of the light-receiving ribs near and away from the light-gathering band are respectively a light-receiving surface and a reflective surface. The light-receiving surface gradually tilts away from the normal of the light-emitting band from the root outwards, and the distance between the reflective surface and the light-receiving surface gradually decreases from the root outwards.

2. The thick-walled light guide with uniform luminous intensity according to claim 1, characterized in that: The light-inlet band is an arc-shaped structure with its protrusion height gradually increasing towards the center, and the normal of the light-inlet band coincides with the normal of the light-emitting band.

3. The thick-walled light guide with uniform luminous intensity according to claim 1 or 2, characterized in that: The reflecting surface is a convex, totally reflective curved surface.

4. The thick-walled light guide with uniform luminous intensity according to claim 1, characterized in that: The light-emitting band consists of an array of distributed pits.

5. The thick-walled light guide with uniform luminous intensity according to claim 1, characterized in that: Several positioning and mounting structures are integrally formed on one or both sidewalls of the optical guide body in the thickness direction.

6. The thick-walled light guide with uniform luminous intensity according to claim 1, characterized in that: The thickness of the light guide body gradually decreases from the end with the light-inlet structure to the end with the light-emitting strip.

7. An optical system, characterized in that: The invention includes a PCBA and a thick-walled light guide with uniform light emission brightness as described in any one of claims 1-6. The PCBA is equipped with multiple LED beads distributed along the length of the light-inlet band. The light-emitting surface of each LED bead is located at the center between two light-receiving surfaces and faces the light-inlet band.

8. The optical system according to claim 7, characterized in that: Each LED bead is evenly distributed along a straight line.

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