CN214501106U - Catadioptric large-angle diffusion lens and lighting device - Google Patents

Abstract

The utility model discloses a catadioptric large-angle diffusion lens, including the lens main part, the lens main part is rotational symmetry formula structure, the lens main part is by supreme first lens part and the second lens part of having set gradually down, the bottom of first lens part is provided with the indent cavity, the bottom surface of indent cavity is provided with first income plain noodles, be provided with the second income plain noodles on the lateral wall of indent cavity, the side of first lens part is provided with first total reflection surface, the top of second lens part is provided with the second total reflection surface, the side of second lens part is provided with the play plain noodles, first income plain noodles, the second income plain noodles, first total reflection surface, second total reflection surface and play plain noodles are arc curved surface. The utility model also discloses a lighting device. The utility model discloses a catadioptric wide-angle diffusion lens and lighting device, the diffusion angle of lens is bigger, and light is longer at the inside optical path of lens, and lamps and lanterns surface brightness is even.

Description

Catadioptric large-angle diffusion lens and lighting device

Technical Field

The utility model belongs to LED illumination lamps and lanterns field especially relates to a catadioptric wide-angle diffusion lens and lighting device.

Background

Most of LED light sources have light emitting characteristics similar to a Lambert type, and the central light intensity of the light distribution type is too large, so that the effect of uniform brightness of the light emitting surface of the panel lamp is not facilitated. In order to meet the optical uniformity of the panel lamp, the light distribution similar to lambertian light emitted by the LED needs to be changed into batwing light distribution with a larger irradiation range and more uniform distribution after passing through the light control function of the lens.

The diffusion lens used for the ultrathin lamp in the current market is mostly a revolution body in a hyperboloid form, and has two defects: (1) due to the characteristics of the material, when the incident angle exceeds the total reflection angle of the material, the light cannot be refracted out of the light-emitting surface of the lens, so that the maximum diffusion angle of the hyperboloid lens has a certain limit. Taking PMMA material as an example, the total reflection angle is as follows:

when the incident angle is more than 42 degrees, the light can be totally reflected in the lens and can not be emitted out of the lens, so that the diffusion capability of the hyperboloid diffusion lens has a theoretical limit. And (2) the spatial distribution of the LED colors is not uniform, and the light mixing effect of the lens with double curved surfaces is limited due to the limited optical path of the light rays in the lens, so that the improvement effect on the spatial colors is limited, and the phenomenon of color unevenness such as severe yellow-blue separation and the like often occurs.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a: the refraction and reflection type large-angle diffusion lens and the illuminating device have the advantages that the diffusion angle of the lens is larger, the optical path of light rays in the lens is longer, the light rays are totally reflected twice and transmitted twice, light mixing can be better, and color consistency is greatly improved.

In order to realize the above-mentioned purpose, on the one hand, the utility model provides a catadioptric large-angle diffusion lens, including the lens main part, the lens main part is rotational symmetry formula structure, the lens main part is by supreme first lens part and the second lens part of having set gradually down, the bottom of first lens part is provided with the indent cavity, the bottom surface of indent cavity is provided with first income plain noodles, be provided with the second income plain noodles on the lateral wall of indent cavity, the side of first lens part is provided with first total reflection surface, the top of second lens part is provided with the second total reflection surface, the side of second lens part is provided with out the plain noodles, first income plain noodles, the second income plain noodles, first total reflection surface, second total reflection surface and play plain noodles are curved surface.

As a further description of the above technical solution:

the lens body is made of optical PC or PMMA material.

As a further description of the above technical solution:

the second lens portion has a trapezoidal structure with a wide top and a narrow bottom in cross section.

On the other hand, the utility model also provides a lighting device, including reflection chassis, a plurality of light source and diffuser plate, still include a plurality of as above-mentioned a catadioptric large-angle diffusion lens, reflection chassis, lens main part, light source and diffuser plate are arranged by supreme down in proper order, and a lens main part corresponds a light source, and the interior concave cavity position of lens main part bottom corresponds the light source.

As a further description of the above technical solution:

the light source is an LED light source.

As a further description of the above technical solution:

a plurality of light source arrays are arranged on the reflection chassis.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

1. the utility model discloses in, first income plain noodles, second income plain noodles, first total reflection face, second total reflection face and play plain noodles are optical control plain noodles, and the face type is special design's the arc curved surface that has the change camber, and the lens main part is through the first income plain noodles, the second income plain noodles, first total reflection face, second total reflection face and go out the different camber change between the plain noodles and thickness change come control light direction, and then reach the grading shape of wide-angle bat wing, realize the even light-emitting effect of panel light luminous surface luminance.

2. The utility model discloses in, be provided with the catadioptric formula diffusion lens the same with LED light source quantity among the lighting device, diffusion lens changes the propagation direction of LED light source emitted light, and the reflection chassis is located the lower part and the reflection light of LED light source, and the diffuser plate shelters from light source and mixed light, makes the luminous surperficial luminance of lamps and lanterns even.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of an illumination device.

Fig. 2 is a schematic cross-sectional view of a catadioptric large-angle diffuser lens.

FIG. 3 is a schematic diagram of the ray paths in a catadioptric wide-angle diffuser lens.

Fig. 4 is a schematic diagram illustrating a forming principle of a total reflection curved surface in a catadioptric large-angle diffusing lens.

Illustration of the drawings:

1. a lens body; 11. a first lens portion; 111. a first total reflection surface; 12. a second lens portion; 121. a second total reflection surface; 122. a light-emitting surface; 13. an inner concave cavity; 131. a first light incident surface; 132. a second light incident surface; 2. a reflective chassis; 3. a light source; 4. and a diffusion plate.

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 of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1-4, the present invention provides a technical solution: on the one hand, the utility model provides a catadioptric large-angle diffusion lens, including lens main part 1, lens main part 1 is rotational symmetry formula structure, lens main part 1 is supreme first lens part 11 and the second lens part 12 of having set gradually by lower, the bottom of first lens part 11 is provided with indent cavity 13, the bottom surface of indent cavity 13 is provided with first income plain noodles 131, be provided with second income plain noodles 132 on indent cavity 13's the lateral wall, the side of first lens part 11 is provided with first total reflection surface 111, the top of second lens part 12 is provided with second total reflection surface 121, the side of second lens part 12 is provided with out plain noodles 122, first income plain noodles 131, second income plain noodles 132, first total reflection surface 111, second total reflection surface 121 and play plain noodles 122 are the arc curved surface.

The lens body 1 is made of optical PC or PMMA material, and the lens body 1 may be made of glass material.

The second lens portion 12 has a trapezoidal structure with a wide top and a narrow bottom in cross section.

On the other hand, the utility model also provides a lighting device, including reflection chassis 2, a plurality of light source 3 and diffuser plate 4, still include a plurality of as above-mentioned a catadioptric large-angle diffusion lens, reflection chassis 2, lens main part 1, light source 3 and diffuser plate 4 are arranged by supreme down in proper order, and a lens main part 1 corresponds a light source 3, and the indent cavity 13 position of lens main part 1 bottom corresponds light source 3.

The light source 3 is an LED light source, is small in size and is convenient for manufacturing ultrathin lamps.

A plurality of light sources 3 are arrayed on the reflective chassis 2.

The working principle is as follows: the position of an inner concave cavity at the bottom of the lens main body corresponds to the LED light source, and the first total reflection surface is a spline curve with a certain curvature change and is arranged on the side surface of the lens; the second total reflection surface is arranged at the top of the lens and is a specially designed spline curve; the light-emitting surface is between the first total reflection surface and the second total reflection surface and is also a spline curve. The surface types of the first light incident surface, the second light incident surface, the first total reflection surface, the second total reflection surface and the light emergent surface are specially designed arc-shaped curved surfaces with specific variable curvatures, and the light direction is controlled through different curvature changes and thickness changes and the mutual matching of the curved surfaces, so that the characteristic of uniform illumination of the irradiated surface is achieved. The light rays follow the law of refraction as they travel inside the lens.

As shown in fig. 3, the light incident surface is composed of a first light incident surface and a second light incident surface, and the light beam is therefore roughly divided into two parts: part of light (light ray 1) emitted by the LED passes through the first light incident surface, is refracted by the first light incident surface, is collimated and emitted, is totally reflected after being transmitted to the second total reflection surface, and is emitted through the light emitting surface of the lens; the other part (light ray 2 and light ray 3) of the light emitted by the LED passes through the second light incident surface and is refracted by the second light incident surface, the refracted light is transmitted at a larger angle and is totally reflected after being transmitted to the first total reflection surface, the totally reflected light is also approximately collimated and is totally reflected when being transmitted to the second total reflection surface, and then the light is emitted from the light emitting surface of the lens.

The first light incident surface is used for collimating and narrowing light, the part within about 20 degrees in the light emitted by the LED is collimated and narrowed to form small-angle light beams, and the light is reflected by the second total reflection surface to emit light.

The second light incident surface is used for deflecting and diffusing the light angle, and deflecting and diffusing the part of the light emitted by the LED, which is greater than 20 degrees, so that the part of the light is transmitted to the first total reflection surface along a larger angle direction, is reflected by the first total reflection surface to become a light beam with a smaller angle, and is reflected by the second total reflection surface to emit light.

The principle of the shaping of the first total reflection surface and the second total reflection surface is shown in fig. 4. The light rays are totally reflected on the two total reflection surfaces respectively, two tangent straight lines with the curvatures of K1 and K2 are taken at the reflection positions respectively, and corresponding refraction angles can be obtained according to different incidence angles; assuming the final emergent ray is in the horizontal direction, we can obtain from the geometrical light system:

wherein, assuming that the lens is made of PMMA material, n1 is 1, n2 is 1.49, and 2 degrees of drawing is left in consideration of the requirement of lumen processThe mode angle is assumed to be theta₅At 88 degrees, one can obtain:

a relational expression of K1 and K2 is obtained according to incident light of each angle, so that a plurality of discrete dot matrixes can be obtained, initial surface types of two total reflection curved surfaces can be fitted according to the dot matrixes, and then the specific optimization of the lens is carried out according to actual effects.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims (6)

1. The catadioptric large-angle diffusion lens is characterized by comprising a lens body (1), wherein the lens body (1) is of a rotationally symmetric structure, a first lens part (11) and a second lens part (12) are sequentially arranged on the lens body (1) from bottom to top, an inwards concave cavity (13) is arranged at the bottom of the first lens part (11), a first light incoming surface (131) is arranged at the bottom surface of the inwards concave cavity (13), a second light incoming surface (132) is arranged on the side wall of the inwards concave cavity (13), a first total reflection surface (111) is arranged on the side surface of the first lens part (11), a second total reflection surface (121) is arranged at the top of the second lens part (12), a light outgoing surface (122) is arranged on the side surface of the second lens part (12), and the first light incoming surface (131) and the second light incoming surface (132), The first total reflection surface (111), the second total reflection surface (121) and the light emitting surface (122) are arc-shaped curved surfaces.

2. The catadioptric large-angle spread lens according to claim 1, wherein the lens body (1) is made of optical PC or PMMA.

3. The catadioptric high angle spread lens of claim 1, wherein the second lens portion (12) has a trapezoidal structure with a wide top and a narrow bottom in cross section.

4. A lighting device, comprising a reflection chassis (2), a plurality of light sources (3) and a diffusion plate (4), characterized in that, further comprising a plurality of refraction and reflection type large angle diffusion lenses according to any one of claims 1-3, wherein the reflection chassis (2), the lens bodies (1), the light sources (3) and the diffusion plate (4) are sequentially arranged from bottom to top, one of the lens bodies (1) corresponds to one of the light sources (3), and the position of the concave cavity (13) at the bottom of the lens body (1) corresponds to the light source (3).

5. A lighting device as claimed in claim 4, characterized in that the light source (3) is an LED light source.

6. A lighting device as claimed in claim 4, characterized in that a plurality of said light sources (3) are arranged in an array on said reflective chassis (2).

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