CN211206834U

CN211206834U - Light guide structure of ultra-short focus

Info

Publication number: CN211206834U
Application number: CN201821612981.5U
Authority: CN
Inventors: 曽俊洋; 李州; 陈欣欣; 郭滨刚
Original assignee: Shenzhen Guangke Holographic Technology Co ltd
Current assignee: Shenzhen Guangke Holographic Technology Co ltd
Priority date: 2018-09-30
Filing date: 2018-09-30
Publication date: 2020-08-07
Anticipated expiration: 2028-09-30

Abstract

The utility model relates to an ultra-short burnt light guide structure, including one deck reflective structure layer, reflective structure layer tilt up or downward sloping, inclination is greater than or equal to 18 and is less than 42, reflective structure layer contains a plurality of reflective structure, reflective structure's aperture size and the duty cycle that reflective structure layer's cycle formed are for being greater than or equal to 0.5 and < 1, and reflective structure layer's cycle is greater than or equal to 50um and is less than or equal to 300 um. The utility model has the advantages that: the light guide device can guide light in a large angle, so that light intensity is uniformly distributed, environment and stray light of secondary reflection around the environment are better absorbed, and the influence of ambient light on a projection picture is avoided.

Description

Light guide structure of ultra-short focus

Technical Field

The utility model relates to an optical projection field, especially a light guide structure of ultrashort burnt.

Background

With the development of the projector industry and the satisfaction of the current market demands, ultra-short-focus projectors gradually enter the living environment of people. The ultra-short-focus projector can realize ultra-short-focus projection, greatly saves projection space, can be suitable for the limited occasions of projection spaces such as small-sized commercial places and home theaters, and has a plurality of factors influencing the imaging effect, including the brightness, contrast, color saturation, lens and the like of the projector, but in the practical use, the ultra-short-focus projector mainly plays a decisive role in the projection effect and is also the intensity of external environment light and stray light. In summary, the effect of ambient light on the projected picture is also apparent. The projection curtain is used as a picture carrier, which not only requires that the projection curtain meets the light path requirement of an ultra-short-focus projector, prevents projection light from being wasted in the projection process, provides a best-quality picture for audiences, but also avoids the influence of exposure, glare, brightness reduction and the like on the projection picture caused by ambient light as much as possible. Many consumers also worry about the problem that the projection picture is not clear under the influence of external light.

In order to solve the problem, the utility model provides an ultrashort burnt light guide structure is fit for the light path requirement of the ultrashort burnt projector on the existing market, can carry out the wide-angle leaded light, makes light distribution even, and the design of its special physical structure can absorb ambient light and the stray light of secondary reflection on every side.

SUMMERY OF THE UTILITY MODEL

The utility model discloses an overcome prior art not enough, provide an ultrashort burnt light guide structure, optics principles such as refraction, reflection and absorption of using light have designed the physical structure who is fit for ultrashort burnt projector light path demand, can absorb the stray light of the ambient light around the projection and thing secondary reflection, avoid ambient light and stray light around to cause the influence to the projection picture, can also realize the wide-angle leaded light, be realized through following technical scheme.

The ultrashort-focus light guide structure comprises a reflection structure layer, wherein the reflection structure layer is inclined upwards or downwards, the inclination angle is larger than or equal to 18 degrees and smaller than 42 degrees, the reflection structure layer comprises a plurality of reflection structures, the duty ratio formed by the aperture size of each reflection structure and the period of each reflection structure layer is larger than or equal to 0.5 and smaller than 1, and the period of each reflection structure layer is larger than or equal to 50um and smaller than or equal to 300 um.

Furthermore, the thickness of each reflecting structure is in proportional relation with the period of the reflecting structure layer, and the ratio range is more than or equal to 0.2 and less than 1.85.

Furthermore, the material of the reflective structure layer is a metal material or an inorganic non-metal material with high reflectivity, and the reflectivity is greater than 90%.

Further, the upper and lower surfaces of each reflective structure have black light absorbing coatings with an absorbance greater than 90% for absorbing stray light from secondary reflections of ambient light and surroundings.

Further, the light guide structure is suitable for front projection or rear projection.

Furthermore, when the inclination angle of the reflecting structure layer is more than or equal to 30 degrees and less than 42 degrees, the projection light can be projected from two sides, and the light is guided to the projection surface. The utility model provides an ultrashort burnt light-directing structure, the light path requirement of the ultrashort burnt projector on being fit for the existing market can carry out the wide-angle leaded light, makes light intensity evenly distributed, and the influence that the ambient light caused the projection picture has been solved to the stray light of better absorption environment and secondary reflection on every side to and furthest prevents that projection light is extravagant at the projection in-process.

Drawings

Fig. 1 is a schematic structural diagram of a light guide structure layer according to an embodiment of the present invention.

Fig. 2 is a schematic view of light refraction at an oblique angle.

Fig. 3 is a schematic view of light refraction at another tilt angle of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, an ultra-short-focus light guide structure includes a reflective structure layer 10 and a substrate, the substrate is used for supporting the reflective structure layer 10, the reflective structure layer 10 is tilted upward or downward, the tilt angle C is greater than or equal to 18 ° and less than 42 °, the reflective structure layer 10 includes a plurality of reflective structures 20, a duty ratio formed by the aperture size B in the reflective structure and the period D of the reflective structure is greater than or equal to 0.5 and less than 1, and the period of the reflective structure layer is greater than or equal to 50um and less than or equal to 300 um.

The reflective structures 20 of the reflective structure layer are arranged regularly and present a certain angle. The material of the reflecting structure layer is a metal material or an inorganic non-metal material with high reflectivity, the reflectivity is more than 90%, and the metal material is a common metal material, such as aluminum; inorganic non-metallic materials, such as alumina, require a reflectivity of greater than 90%.

The thickness of each reflective structure 20 of the reflective structure layer 10 is proportional to the period of the reflective structure layer, and the ratio is greater than or equal to 0.2 and less than 1.85. The upper and lower surfaces of each reflective structure have black light absorbing coatings with an absorbance greater than 90% for absorbing stray light A from secondary reflections of ambient light and surroundings.

The light guide structure is suitable for orthographic projection or rear projection and is a structure capable of projecting on both sides.

As shown in fig. 2-3, when the inclination angle of the reflective structure layer is greater than or equal to 30 ° and less than 42 °, the projection light can be projected from both sides, and the light is guided to the projection plane.

Referring specifically to fig. 2, the projection optics projects from two sides, taking the left side as a projection plane, the light 100 of the projection plane refers to the light with dark color in the figure, and the other side is the light 200, and referring to the light with light color in the figure, when the inclination angle of the light guide structure is 30 °, the refraction paths of the light 100 and the light 200 are refracted toward the projection plane.

Referring specifically to fig. 3, the projection optics projects from two sides, taking the left side as a projection plane, the light 100 of the projection plane refers to the light with dark color in the figure, and the other side is the light 200, and referring to the light with light color in the figure, when the inclination angle of the light guide structure is 42 °, the refraction paths of the light 100 and the light 200 are refracted toward the projection plane.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The ultrashort-focus light guide structure is characterized by comprising a reflection structure layer, wherein the reflection structure layer is inclined upwards or downwards, the inclination angle is larger than or equal to 18 degrees and smaller than 42 degrees, the reflection structure layer comprises a plurality of reflection structures, the duty ratio formed by the aperture size of each reflection structure and the period of each reflection structure layer is larger than or equal to 0.5 and smaller than 1, and the period of each reflection structure layer is larger than or equal to 50um and smaller than or equal to 300 um.

2. The light guide structure of claim 1, wherein the thickness of each reflective structure is proportional to the period of the reflective structure layer, and the ratio is in the range of 0.2 to 1.85.

3. The light guide structure of claim 1, wherein the reflective structure layer is made of a metal material or an inorganic non-metal material with high reflectivity, and the reflectivity is greater than 90%.

4. A light-guiding structure as claimed in claim 1, wherein the upper and lower surfaces of each reflective structure are provided with black light-absorbing coatings having an absorbance greater than 90% for absorbing stray light from secondary reflections from ambient light and surroundings.

5. The light guide structure of claim 1, wherein the light guide structure is suitable for use in front or rear projection.

6. The light guide structure of claim 1, wherein the angle of inclination of the reflective structure layer is greater than or equal to 30 ° and less than 42 °, so that the projected light can be projected from both sides and the light is guided to the projection plane.