Optical structure for realizing inclined light guide plate and long-distance uniform light emission of inclined light guide plate

Abstract

The utility model discloses an optical structure for realizing an inclined light guide plate and long-distance uniform light emission thereof. The optical structure comprises an inclined light guide plate main body, an inclined extension part connected with the side end of the light guide plate main body, and a plurality of LED light sources close to the light inlet end of the light guide plate main body, a plurality of groups of incident light structures which are connected end to end and correspond to the LED light sources are formed at the incident light end of the light guide plate main body, each group of incident light structure comprises a refracting surface and a collimation surface, the normal direction of the refracting surface is consistent with the inclination direction of the light guide plate main body, and the collimation direction of the collimation surface is consistent with the inclination direction of the inclined extension part; and the thickness of the inclined extension part is gradually reduced from the direction close to the light guide plate main body to the direction far away from the light guide plate main body. On the premise that the size and the size of the whole light guide plate structure are guaranteed, the overall angle of light rays is effectively changed, the light guide plate structure adapts to the inclination angle of the light guide plate model, and long-distance uniform lighting can be achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of headlamp production, in particular to an optical structure for realizing an inclined light guide plate and its long-distance uniform light emission. Background Art

[0002] In the prior art, with the development of headlamp technology, people have put forward higher requirements for its appearance and lighting effect. At present, in the market solutions of light guide plates, in addition to excellent spatial layout, cool visual effects and lighting methods are also increasingly favored by vehicle manufacturers. With the fierce market competition, the demands of vehicle manufacturers for the shapes of lamps are becoming more and more variable and complex, and some limitations of the light guide plate solutions are gradually revealed.

[0003] One of the most important evaluation criteria of a light guide plate is the uniformity of the brightness of its light-emitting surface. However, when the extension direction of the light guide plate is quite different from the light-emitting direction of the light source, the phenomenon of uneven brightness will occur, that is, the end near the light source is brighter, while the end far from the light source is darker. As the length of the extension direction increases, the light energy in the light guide plate decreases, and the brightness at the end will be further reduced.

[0004] When the extension direction of the light guide plate is quite different from the light-emitting direction of the light source, bright reflection spots and dark areas are likely to occur at the side edge of the light guide plate. The reason is that the light is directly incident on the side wall of the side end inclined towards the light source direction and total reflection occurs, thus generating bright spots; while the part on the other side deviating from the light source direction has a large included angle with the light axis direction of the light source, and less light enters this area, thus generating dark areas. The conventional solutions are generally: adding a refraction pattern or a condenser structure with a certain angle on the light incident surface to change the direction of the light. However, for the conventional refraction pattern, while guiding some light to the required direction, the stepped surface of the pattern will generate some stray light in other directions, thus affecting the lighting uniformity. And the condenser structure has high requirements for the structure size and positioning accuracy, and the rounded corners of the patterns between multiple surfaces of the condenser are prone to produce a condensing effect and thus generate bright line defects.

[0005] When the length of the light guide plate increases along the extension direction, there is usually an obvious decrease in brightness on the side far from the light source in the current light guide plate. The reason is that as the optical path increases, the light intensity in the light guide plate gradually decreases, and the light energy at the end is insufficient to effectively light up the end of the light guide plate. The conventional solutions are generally: reducing the overall brightness; or designing gradually changing patterns or leather patterns and other structures on the light path. The former can improve the overall uniformity, but the lighting brightness and the efficiency of the optical system are greatly reduced, and usually the light source power needs to be increased to make up for it. On the one hand, this increases the cost, and on the other hand, it does not conform to the concept of sustainable development. And for the latter, when the light guide plate is exposed and the optical structure is visible, the static appearance and lighting effect of the light-emitting area cannot be consistent before and after. Summary of the Utility Model

[0006] The technical problem to be solved by the present utility model is to overcome the deficiencies of the prior art and provide an optical structure for realizing an inclined light guide plate and its long-distance uniform light emission. On the premise of ensuring the overall size and dimensions of the light guide plate structure, it can effectively change the overall angle of light, adapt to the inclined angle of the light guide plate shape, and can realize long-distance uniform lighting.

[0007] To solve the above technical problems, the technical solution of the present utility model is as follows:

[0008] An optical structure for realizing an inclined light guide plate and its long-distance uniform light emission, which includes an inclined light guide plate main body, an inclined extension part connected to the side end of the light guide plate main body, and a plurality of LED light sources near the light incident end of the light guide plate main body;

[0009] A plurality of light incident structures that are connected end to end and correspond to the LED light sources are formed at the light incident end of the light guide plate main body. Each group of the light incident structures includes a refraction surface and a collimation surface. The normal direction of the refraction surface is consistent with the inclined direction of the light guide plate main body, and the collimation direction of the collimation surface is consistent with the inclined direction of the inclined extension part;

[0010] The thickness of the inclined extension part gradually decreases from the direction close to the light guide plate main body to the direction away from the light guide plate main body.

[0011] Furthermore, the collimation surface is perpendicular to the light guide plate main body.

[0012] Furthermore, the back surfaces of the light guide plate main body and the inclined extension part are provided with uniform optical patterns or microstructures.

[0013] By adopting the above technical solution, the present utility model has the following beneficial effects:

[0014] 1. At the light incident end of the light guide plate main body of the present utility model, through multiple groups of light incident structures connected end to end and the way of the intersection of the collimation surface and the refraction surface, the overall direction of the incident light is changed through the refraction surface, avoiding the influence of stray light generated by the side walls of the existing light incident patterns on the lighting effect, and improving the lighting uniformity; the normal direction of the refraction surface is consistent with the inclined direction of the light guide plate main body, enabling the light to adapt to the inclined angle of the light guide plate shape and avoiding the generation of bright spots. The collimation direction of the collimation surface is consistent with the inclined direction of the inclined extension part, enabling the collimated light to exit from the side wall to avoid bright spots generated by total internal reflection with the side wall.

[0015] 2. The thickness of the inclined extension part of the present utility model gradually decreases from the direction close to the light guide plate main body to the direction away from the light guide plate main body, that is, the distance between the back surface and the front surface of the inclined extension part gradually decreases. It can gradually increase the contact between the back surface of the light guide plate and the collimated light. Furthermore, when the optical path increases, effective lighting can still be gradually carried out, ensuring the lighting effect at the end, improving the overall lighting uniformity, having a higher lighting efficiency, and saving costs.

[0016] 3. The back of the light guide plate body and the inclined extension part of the present utility model is provided with uniform optical patterns or microstructures, which can achieve consistent static and lighting effects.

[0017] 4. The structure of the present utility model is simple and effective, which can avoid the defects caused by the rounded corners of multiple surfaces combined. Without changing the original size and dimensions of the light guide plate structure, only by opening multiple groups of light incident structures, the overall angle of light can be effectively changed, adapting to the inclined angle of the light guide plate shape, and realizing uniform lighting at a long distance. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of the present utility model;

[0019] Figure 2 is a partial enlarged schematic diagram of the light incident structure of the present utility model;

[0020] Figure 3 is a schematic diagram of the optical path principle of the light incident structure of the present utility model;

[0021] Figure 4 is a schematic diagram of the optical path principle of the quasi-straight surface of the light incident structure of the present utility model;

[0022] Figure 5 is a schematic diagram of the optical path principle of the light guide plate body of the present utility model;

[0023] Figure 6 is a schematic diagram of the overall optical path principle of the present utility model;

[0024] Figure 7 is a schematic diagram of the optical path principle of the inclined extension part of the present utility model;

[0025] Among them, 1. Light guide plate body; 2. Inclined extension part; 3. Light incident structure; 31. Refraction surface; 32. Quasi-straight surface; 4. LED light source. Detailed Embodiment

[0026] In order to make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments and in combination with the drawings.

[0027] As Figure 1-7 shown, in this embodiment, an optical structure for realizing an inclined light guide plate and its long-distance uniform light emission is provided, which mainly consists of components such as an inclined formed light guide plate body 1, an inclined extension part 2, and multiple LED light sources 4. The LED light sources 4 are arranged on the PCB board, and the entire optical structure is installed in the lamp. Among them, the inclined extension part 2 is connected and formed with the side end of the light guide plate body 1, and multiple LED light sources 4 are close to the light incident end of the light guide plate body 1, and the light emitted by the LED light sources 4 can enter from the light incident end of the light guide plate body 1.

[0028] Specifically, a plurality of light incident structures 3 that are connected end to end and correspond to the LED light sources 4 are formed at the light incident end of the light guide plate body 1. Each group of light incident structures 3 is composed of a refractive surface 31 at an angle and a collimating surface 32. The normal direction of the refractive surface 31 is consistent with the inclination direction of the light guide plate body 1, and the collimating direction of the collimating surface 32 is consistent with the inclination direction of the inclined extension portion 2. Here, the angle between the collimating direction and the side wall of the light guide plate should be less than the total reflection triggering condition, so that the collimated light can exit from the side wall to avoid bright spots caused by total reflection with the side wall. The refractive surface 31 is designed to deflect the direction of a part of the light emitted by the LED light source 4 towards the inclination direction of the light guide plate body 1, and the collimating surface 32 is designed to collimate and parallelize another part of the light emitted by the LED light source 4 to the light guide plate body 1 and deflect it towards the other side of the inclination direction of the light guide plate body 1, that is, the inclined extension portion 2 direction. Through the above structure, the overall direction of the light passing through the refractive surface 31 can be made consistent with the inclination direction of the light guide plate body 1, and the direction of the light passing through the collimating surface 32 is parallel to the light guide plate body 1 and does not contact the front and back surfaces of the light guide plate, thus avoiding total reflection and emitting from the front surface of the light guide plate. Through a plurality of light incident structures 3 that are connected end to end and the way the collimating surface 32 and the refractive surface 31 are connected to each other, the refractive surface 31 changes the overall direction of the incident light, avoids the influence of stray light generated by the side wall of the existing light incident pattern on the lighting effect, improves the lighting uniformity; the normal direction of the refractive surface 31 is consistent with the inclination direction of the light guide plate body 1, enabling the light to adapt to the inclination angle of the light guide plate shape and avoiding the generation of bright spots. The collimating direction of the collimating surface 32 is consistent with the inclination direction of the inclined extension portion 2, enabling the collimated light to exit from the side wall to avoid bright spots caused by total reflection with the side wall.

[0029] To improve the lighting uniformity of the extension portion, the thickness of the inclined extension portion 2 gradually decreases from near the light guide plate body 1 to away from the light guide plate body 1, that is, the distance between the back surface and the front surface of the inclined extension portion 2 gradually decreases, as shown in Figure 7 the figure. In this way, the contact between the back surface of the light guide plate and the collimated light can be gradually increased. Furthermore, when the optical path increases, effective lighting can still be gradually carried out, ensuring the lighting effect at the end, improving the overall lighting uniformity, having a higher lighting efficiency, and saving costs. The degree and trend of the change in the distance are not restricted and can be adjusted according to actual needs.

[0030] To avoid the light from exiting from the lighting area due to total reflection when the light touches the inner and outer surfaces of the light guide plate, the collimating surface 32 in this embodiment is perpendicular to the light guide plate body 1. In this way, it can be ensured that the direction of the light passing through the collimating surface 32 is parallel to the light guide plate body 1 and does not contact the front and back surfaces of the light guide plate, thus avoiding total reflection and emitting from the front surface of the light guide plate.

[0031] In order to achieve consistent static and lighting effects, uniform optical patterns or microstructures are provided on the back surfaces of the light guide plate body 1 and the inclined extension part 2 in this embodiment.

[0032] Through the above design, it can be found after performing an optical path simulation on the light guide plate structure of this embodiment. Refer to Figure 5 As shown, after adding the light incident structure 3 at the light incident end, the light emitted by the LED light source 4 passes through the refraction surface 31 at the light incident end, and the light direction is effectively changed, and the light distribution is uniform. At the same time, the light deviating from the trend direction of the light guide plate hardly contacts the front and back surfaces of the light guide plate after passing through the straightening surface 32, and can be emitted from the side of the light guide plate without affecting the front lighting area.

[0033] In addition, the structure of this embodiment is simple and effective. Only multiple groups of light incident structures need to be added at the light incident end, and the size of this structure is small, without changing the spatial size of the original structure, so as not to affect the original design data, and it is neat and beautiful. In addition, this solution does not require adding any structure in the lighting area, maintaining the original appearance and ensuring the consistency of the static and lighting appearances of the entire light-emitting area.

[0034] At the same time, this embodiment can avoid the defects caused by the rounded corners of multiple surface combinations. Through local light chasing, that is Figure 3 it can be found that only a small amount of light is emitted through the rounded corner between the refraction surface 31 and the straightening surface 32 to form stray light, and this part of the stray light is evenly scattered and will not have an obvious impact on the overall lighting effect. Of course, when the spacing is large, a horizontal plane can be added between each light incident structure 3 for connection.

[0035] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0036] The above specific embodiments have further detailed the technical problems solved, technical solutions and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. An optical structure for implementing an inclined light guide plate and its long-distance uniform light emission, characterized in that: It includes an inclined formed light guide plate body (1), an inclined extension part (2) connected to the side end of the light guide plate body (1), and a plurality of LED light sources (4) near the light incident end of the light guide plate body (1); The light incident end of the light guide plate body (1) is formed with multiple groups of light incident structures (3) that are connected end to end and correspond to the LED light sources (4). Each group of the light incident structures (3) includes a refraction surface (31) and a collimation surface (32). The normal direction of the refraction surface (31) is consistent with the inclination direction of the light guide plate body (1), and the collimation direction of the collimation surface (32) is consistent with the inclination direction of the inclined extension part (2); The thickness of the inclined extension part (2) gradually decreases from the direction close to the light guide plate body (1) to the direction away from the light guide plate body (1).

2. An optical structure for realizing an inclined light guide plate and its long-distance uniform light emission according to claim 1, characterized in that: The collimation surface (32) is perpendicular to the light guide plate body (1).

3. An optical structure for realizing an inclined light guide plate and its long-distance uniform light emission according to claim 1, characterized in that: The back surfaces of the light guide plate body (1) and the inclined extension part (2) are provided with uniform optical patterns or microstructures.

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