CN210803764U

CN210803764U - Flat lens for air imaging and air imaging system

Info

Publication number: CN210803764U
Application number: CN201921690665.4U
Authority: CN
Inventors: 黄坤; 张峰
Original assignee: Zhejiang Prism Holographic Technology Co ltd
Current assignee: Zhejiang Prism Holographic Technology Co ltd
Priority date: 2019-09-30
Filing date: 2019-10-10
Publication date: 2020-06-19
Anticipated expiration: 2029-10-10

Abstract

The utility model discloses a plate lens for air imaging, including parallel arrangement's first optical waveguide lens array and second optical waveguide lens array, every optical waveguide lens array all includes a plurality of parallel arrangement's reflection lens, reflection lens in the first optical waveguide lens array and the reflection lens quadrature in the second optical waveguide lens array are arranged, the width of reflection lens is reduced the setting to the edge by the center of optical waveguide lens array. The air imaging system comprises a light source and the flat lens, and the flat lens is any one of the flat lenses for air imaging. The utility model has the advantages that: compared with a common strip-shaped reflector, the diffuse spot is smaller after the scheme is adopted, so that the spherical aberration is smaller, the imaging depth of field is larger, the imaging definition is effectively improved, the size of the original flat lens can not be changed by the design, and the original air imaging equipment can be directly replaced.

Description

Flat lens for air imaging and air imaging system

Technical Field

The utility model relates to the field of optical technology, concretely relates to air formation of image is with dull and stereotyped lens and air imaging system.

Background

A flat lens for air imaging is generally a strip reflector or a dihedral corner reflector, a strip light-transmitting body is plated with a reflecting surface to form the strip reflector, a plurality of strip reflectors are spliced side by side to form an optical waveguide lens array, two optical waveguide lens arrays are orthogonally overlapped to form a whole optical imaging element, however, in each existing optical waveguide lens array, the width of each strip reflector is equal, the distance from a light source to the reflecting surface of each strip reflector is unequal, a light spot is formed after passing through each strip reflector, all the light spots are overlapped to form spherical aberration, the depth of field of air imaging is reduced due to overlarge spherical aberration, the imaging definition is not high, in the optical lens, the definition is improved by combining a convex lens and a concave lens, but the convex lens and the concave lens are combined in an air imaging device, the visual angle of the picture is seriously affected.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a need not to use meniscus lens combination can improve the air imaging of dull and stereotyped lens definition and use dull and stereotyped lens and air imaging system.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme: the flat lens for air imaging comprises a first optical waveguide lens array and a second optical waveguide lens array which are arranged in parallel, wherein each optical waveguide lens array comprises a plurality of reflecting lenses which are arranged in parallel, the reflecting lenses in the first optical waveguide lens array are orthogonally arranged with the reflecting lenses in the second optical waveguide lens array, and the widths of the reflecting lenses are reduced from the center to the edge of the optical waveguide lens array.

Preferably, the width of the reflector is gradually decreased from the center to the edge of the optical waveguide reflector array, so that the influence of large size fluctuation on the uniformity and brightness of an imaged picture is prevented.

Preferably, the widths of the reflecting mirrors decrease from the center to the edge of the optical waveguide mirror array in an equal difference mode, so that the optical path difference and the actual space after imaging change periodically, and the uniformity of the image is improved.

Preferably, at least two adjacent reflection lenses with the same width form a lens group, the width of the reflection lens of the adjacent lens group is gradually decreased from the center to the edge of the optical waveguide lens array, and the effect of reducing the spherical aberration is achieved, and meanwhile, the cost control is facilitated.

Preferably, the width of the reflector is 0.1-4 mm, and less than 0.1mm can reduce the light transmission amount and the overall brightness of the image, while more than 4mm is not easy to generate total reflection.

Preferably, the thickness of the reflector plate is 0.5-4 mm, the thickness of the reflector plate is larger than or equal to the width of the reflector plate, the light flux is reduced due to too low thickness, the imaging brightness is affected, the loss of the light rays is increased due to too thick thickness of the reflector plate, and stray light can be effectively eliminated due to the fact that the thickness of the reflector plate is larger than or equal to the width of the reflector plate.

Preferably, the length direction of the reflector in the first optical waveguide lens array forms an included angle of 45 degrees or 135 degrees with the edge of the first optical waveguide lens array, and the optimal incident angle of the light forms total reflection in the optical waveguide lens array, so as to achieve the best imaging effect.

Preferably, the reflector plate is in a long strip shape, and the two opposite side surfaces are plated with the reflecting layers to form an independent reflecting space, so that the light rays entering the reflector plate can be accurately reflected, and the light loss of the light rays reflected is reduced.

Preferably, the flat lens further comprises two transparent substrates, and the two transparent substrates are a transparent substrate, a first optical waveguide lens array, a second optical waveguide lens array and another transparent substrate which are tightly attached to each other from left to right, and the two optical waveguide lens arrays are protected by the two transparent substrates.

An air imaging system comprises a light source and a flat lens, wherein the flat lens is any one of the flat lenses for air imaging.

Compared with the prior art, the utility model has the advantages that:

1. the width of the reflecting lens is reduced from the middle to the edge to form a waveguide structure of a slit, light is subjected to optical imaging through the slit, when light is reflected through the reflecting lens at the edge, the width of the light is smaller than that of the reflecting lens in the existing scheme, which is equivalent to that of the reflecting surface, the distribution of the reflecting surface is denser, and the light spot of the light reflected by the edge reflecting lens towards the central imaging surface is smaller, so that compared with a common strip-shaped reflector, the diffuse spot is smaller after the scheme is adopted, the spherical aberration is smaller, the imaging depth of field is larger, and the imaging definition is effectively improved;

2. compared with the existing mode of improving the definition by adopting the concave-convex lens, the design can not change the size of the original flat lens, does not need to change the structure and the size of a flat lens component used for mounting in the air imaging equipment, can be directly replaced on the original air imaging equipment, and avoids the cost rise caused by replacing the mounting component;

3. meanwhile, due to the fact that a concave-convex lens structure is not adopted, the visual angle of the original air imaging device cannot be changed, and the position relation of imaging related parts in equipment does not need to be adjusted.

Drawings

Fig. 1 is an exploded view of a flat lens for air imaging according to the present invention;

fig. 2 is a front view of a second embodiment of the first optical waveguide lens array of the flat lens for air imaging according to the present invention;

fig. 3 is an imaging schematic diagram of a flat lens for air imaging according to the present invention;

fig. 4 is a schematic diagram of an air imaging system.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

The first embodiment is as follows:

referring to fig. 1, a first embodiment of a flat lens for air imaging according to the present invention, a flat lens for air imaging, includes a first optical waveguide lens array 1 and a second optical waveguide lens array 2 arranged in parallel, each optical waveguide lens array includes a plurality of parallel mirrors 3, the mirrors 3 in the first optical waveguide lens array 1 are arranged orthogonally to the mirrors 3 in the second optical waveguide lens array 2, the width W of the mirrors 3 decreases from the center to the edge of the optical waveguide lens array, the center of the optical waveguide lens array is the middle mirror 3 of the whole lens array, the width of the middle mirror 3 is the widest, the width of the mirror 3 farther away from the middle mirror is smaller, the middle mirror in fig. 1 should be the one closest to the diagonal, so as to form a waveguide structure of a slit, the light is optically imaged through the slit to reduce spherical aberration, and the width of the mirror plate 3 refers to the distance between the two reflecting surfaces of the mirror plate 3.

The width of the reflecting lens 3 from the middle to the edge can be irregularly reduced and can also be decreased in an equal difference decreasing mode, preferably, the equal difference decreasing mode is adopted, the optical path difference of periodic decreasing light and the actual difference before and after imaging also change periodically, and light spots of all points are uniform after the light passes through the flat lens.

Further, the width W of the reflector plate 3 is between 0.1mm and 4mm, and too little width of the reflector plate 3 can cause too little light entering the reflector plate 3, thereby affecting the imaging brightness, and being higher than 4mm, not easy to generate total reflection, and also affecting the imaging quality. Preferably, the thickness H of the reflector 3 is 0.5-4 mm, and the thickness H is greater than the width W, and the larger the difference is, the better the stray light can be eliminated effectively, so-called stray light is light passing through only one of the optical waveguide lens arrays.

The length direction of the reflector 3 in the first optical waveguide lens array 1 forms an included angle of 45 degrees or 135 degrees with the edge of the first optical waveguide lens array 1, and light rays emitted from the LED flat plate and the side of the optical waveguide lens array in parallel enter the flat lens at an optimal angle, so that the best imaging effect is realized. The most central mirror plate in this embodiment is the mirror plate with the longest length.

The reflection lens 3 is generally called as a strip shape, two opposite surfaces are plated with reflection layers, the two opposite surfaces are generally the largest side surfaces of the whole reflection lens 3, enough reflection angles are ensured, a plurality of reflection lenses 3 are parallelly overlapped to form an optical waveguide lens array, two light-transmitting substrates 5 are added on the outer sides of the two overlapped optical waveguide lens arrays to fix and protect the optical waveguide lens array, the light-transmitting substrates 5 and the reflection lenses 3 are both made of high-light-transmittance materials, the sizes and the arrangement of the two optical waveguide lens arrays are completely the same, only the angles are opposite, the reflection lens 3 in the first optical waveguide lens array 1 is at 45 degrees, and the reflection lens 3 in the second optical waveguide lens array 2 is at 135 degrees.

Fig. 3 is the utility model discloses improve back optical waveguide imaging principle and prior art contrast sketch map, the dotted line is prior art's formation of image in the picture, and the formation of image diffuse spot diameter that the point light source passes through two optical waveguides is BD2 in the prior art, and the slab lens formation of image diffuse spot diameter of this embodiment is BD1, and is little because of BD1 is little than BD2, and the dispersed spot diminishes, and the spherical aberration reduces from this.

Example two:

the difference from the first embodiment is that: at least two adjacent and equal width reflection lens 3 constitute lens group 4, and the reflection lens quantity in every group lens group can equal, also can not be equal, is two equal and parallel arrangement's of width reflection lens 3 in every group lens group 4 in this embodiment. As shown in fig. 2, a, b, c represent the reflective mirrors 3 with different widths, respectively, and the width a > b > c, one set of two mirrors can also form a slit waveguide structure to reduce the spherical aberration, so that the arrangement can reduce the manufacturing cost while ensuring the effect of reducing the spherical aberration.

In addition to the arrangement of the reflective mirrors in the two embodiments, the widths of the reflective mirrors may be arranged from the center to the edge in other regular or irregular manners, as long as the widths of the reflective mirrors far from the center are reduced or unchanged relative to the widths of the reflective mirrors near the center, and finally the widths of at least one reflective mirror at a non-center position are smaller than the widths of the reflective mirrors at a center position.

As shown in fig. 4, an air imaging system includes a light source 8 and a flat lens 6, the flat lens is any one of the above flat lenses for air imaging, and light emitted from the light source 8 is imaged 7 in air through the flat lens 6.

The above description is only for the specific embodiment of the present invention, but the technical features of the present invention are not limited thereto, and any person skilled in the art can make changes or modifications within the scope of the present invention.

Claims

1. The utility model provides a flat lens for air imaging, includes parallel arrangement's first optical waveguide lens array and second optical waveguide lens array, and every optical waveguide lens array all includes a plurality of parallel arrangement's speculum piece, the speculum piece in first optical waveguide lens array and the speculum piece quadrature arrangement in the second optical waveguide lens array which characterized in that: the width of the mirror plate decreases from the center to the edge of the optical waveguide mirror array.

2. A flat lens for air imaging as defined in claim 1, wherein: the width of the reflector plate is gradually decreased from the center to the edge of the optical waveguide lens array.

3. A flat lens for air imaging as defined in claim 2, wherein: the widths of the reflecting mirrors are decreased in an equal difference from the center to the edge of the optical waveguide mirror array.

4. A flat lens for air imaging as defined in claim 1, wherein: and the widths of the reflecting lenses of the adjacent lens groups are gradually reduced from the center to the edge of the optical waveguide lens array.

5. A flat lens for air imaging as defined in claim 1, wherein: the width of the reflector plate is 0.1-4 mm.

6. A flat lens for air imaging as defined in claim 5, wherein: the thickness of the reflector plate is 0.5-4 mm, and the thickness of the reflector plate is larger than or equal to the width of the reflector plate.

7. A flat lens for air imaging as defined in claim 1, wherein: the length direction of the reflector in the first optical waveguide lens array forms an included angle of 45 degrees or 135 degrees with the edge of the first optical waveguide lens array.

8. A flat lens for air imaging as defined in claim 1, wherein: the reflecting lens is in a strip shape, and two opposite side surfaces are plated with reflecting layers.

9. A flat lens for air imaging as defined in claim 1, wherein: the flat lens further comprises two light-transmitting substrates, wherein the light-transmitting substrate, the first optical waveguide lens array, the second optical waveguide lens array and the other light-transmitting substrate which are tightly attached are sequentially arranged from left to right.

10. An air imaging system, including light source and flat lens, its characterized in that: the flat lens for air imaging according to any one of claims 1 to 9.