CN118066500A

CN118066500A - Extended range type light mixing lens and lighting device

Info

Publication number: CN118066500A
Application number: CN202410349372.9A
Authority: CN
Inventors: 吴海生; 王洪波; 郭清华
Original assignee: NVC Lighting Technology Corp
Current assignee: NVC Lighting Technology Corp
Priority date: 2024-03-26
Filing date: 2024-03-26
Publication date: 2024-05-24

Abstract

The invention discloses an extended range type light mixing lens, which comprises a lens body, wherein the lens body is a rotationally symmetrical body surrounding a central axis, the lens body comprises a first area, a second area, a third area and a total reflection surface, a first cavity is formed in the first area, and the first cavity comprises a first incidence surface and a second incidence surface; the second area is arranged above the first area, and a second cavity is arranged in the second area and comprises a first emergent surface and a refracting surface; the third area is arranged above the second area, a third cavity is formed in the third area, and a second emergent surface is arranged in the third cavity; the total reflection surface is arranged around the periphery of the first area, the second area and the third area. The extended range type light mixing lens performs light mixing and color mixing treatment on light rays through the first region, the second region, the third region and the total reflection surface, so that the light emitting efficiency is improved. The invention also provides a lighting device comprising the extended range type light mixing lens.

Description

Extended range type light mixing lens and lighting device

Technical Field

The invention relates to the technical field of mixed light illuminating devices, in particular to a range-extending mixed light lens and an illuminating device.

Background

The LED lamp is a solid semiconductor device capable of directly converting electric energy into light energy, and can emit light rays with different wavelengths and different colors by adopting different kinds of light emitting chips. In the structure of the LED lamp, a combination mode of an LED chip, fluorescent glue and a lens is generally adopted. The fluorescent glue covers the surface of the LED chip, and the lens covers the upper part of the LED chip. The fluorescent powder in the fluorescent glue is excited by the monochromatic light emitted by the LED chip to emit light, the monochromatic light is mixed with the monochromatic light which is not absorbed by the fluorescent powder to form white light, and the white light is emitted to the outside after being processed by the lens. Multicolor light mixing is required in the LED chip and the phosphor due to the difference in color temperature.

In a conventional polychromatic light mixing scheme, the light mixing structure of a single light source generally mixes light in the following manner: (1) A diffusion film or a diffusion sheet is additionally arranged above the common lens to achieve the purpose of uniform light mixing; (2) And a light guide column is additionally arranged, and light distribution is carried out after the light of the multicolor light source is mixed together by the light guide column. The light mixing structure of the multiple light sources generally utilizes the array of different light sources to adjust the light mixing effect. However, there are cases where color mixing is uneven at the edges of the light sources or at the center of the light spot, whether the light source is a single light source or a mixture of light sources.

The prior art discloses a uniform total internal reflection lens mixes light, including the lens body, the lens body reduces from last size down gradually, the bottom of lens body is provided with the accommodation chamber that is used for installing LED, the accommodation chamber sets up in the centre of lens body bottom, the inner wall of accommodation chamber is provided with the bar line that is used for strengthening the effect of mixing light, red LED is installed to the accommodation intracavity, green LED, blue LED and white LED, the side of lens body is provided with the scale that is used for refracting light, the top of lens body is provided with the compound eye that is used for the efflux light and is used for preventing the light to pass through the shading portion of compound eye efflux, shading portion sets up in the centre at lens body top, the inside transparent pearl body that is provided with the lens body refractive index inequality of lens body. Light emitted by an LED in a containing cavity of the total internal reflection lens is firstly mixed by the stripe, then is subjected to second-degree light mixing by bulb refraction, and finally is subjected to third-time light mixing by the compound eye, so that light rays can be reflected and refracted in the lens body for multiple times. The path of the light rays of the lens appears to be complex.

Disclosure of Invention

In order to solve the above problems, the present invention provides an extended range type light mixing lens, which performs light mixing and color mixing treatment on light rays through a first region, a second region, a third region and a total reflection surface, so as to improve light extraction efficiency. The invention also provides a lighting device comprising the extended range type light mixing lens.

In order to achieve the above object, the present invention provides the following technical solutions:

The extended range type light mixing lens comprises a lens body, wherein the lens body is a rotationally symmetrical body surrounding a central shaft, and the lens body comprises:

the first area is provided with a first cavity, and the first cavity comprises a first incidence surface and a second incidence surface;

The second area is arranged above the first area, a second cavity is formed in the second area, and the second cavity comprises a first emergent surface and a refractive surface;

The third area is arranged above the second area, a third cavity is formed in the third area, and a second emergent surface is arranged in the third cavity; and

And the total reflection surface is arranged around the peripheries of the first area, the second area and the third area.

In one preferred embodiment, the first region is provided with a refractive body, which is arranged between the first cavity and the second cavity.

In one preferred embodiment, the first incident surface and the second incident surface both receive light emitted by the light source; the first incidence surface is arranged on the side wall of the first cavity, and is a collimation cambered surface protruding towards the first cavity.

In one preferred embodiment, the second incident surface is disposed on a top surface of the first cavity.

In one preferred embodiment, the first region is provided with a circular first opening at the bottom, the diameter of the first opening being greater than the diameter of the second entrance face.

In one preferred embodiment, among the light rays emitted by the light source, wherein:

The light entering the lens body from the first incident surface is a first part of light, the first part of light is parallel light, and the first part of light is emitted from the second emergent surface after being totally reflected by the total reflection surface;

The light entering the lens body from the second incident surface is a second part of light, and the second part of light enters the second cavity through the first emergent surface and finally exits from the third cavity.

In one preferred embodiment, the first exit surface is a circular plane, and the second area is provided with a circular second opening at the top of the second cavity, and the diameter of the second opening is larger than that of the first exit surface.

In one preferred embodiment, the refractive surface is a plane extending obliquely from the first exit surface to the second opening;

The second part of light entering the second cavity enters the lens body again from the refraction surface to form a third part of light, and the third part of light is emitted from the second emergent surface after being totally reflected by the total reflection surface.

In one preferred embodiment, the third region is provided with a circular third opening at the top of the third cavity, and the diameter of the third opening is larger than that of the second opening.

In one preferred embodiment, the first incident surface, the first exit surface, the second exit surface and the total reflection surface are respectively provided with microstructures.

The invention also provides a lighting device which comprises a light source and the extended range type light mixing lens, wherein the light source is arranged in the first cavity.

Based on the technical scheme, the invention has the following technical effects:

1. According to the extended-range type light mixing lens, light mixing and color mixing treatment are carried out on the light rays through the first area, the second area, the third area and the total reflection surface, the light ray path is prolonged, the first part of light rays, the second part of light rays and the third part of light rays are all subjected to refraction or reflection treatment and then are emitted to the outside, the controllability of the light rays is ensured, and the light mixing and color mixing effect is improved.

2. The lighting device of the invention adopts a single extended range type light mixing lens, so that light mixing and color mixing treatment can be carried out on a single or a plurality of light sources, and the extended range type light mixing lens has strong adaptability, so that the light emitting efficiency of the lighting device can reach more than 85 percent.

Drawings

Fig. 1 is a schematic diagram of the structure of an extended-range type light mixing lens of embodiment 1.

Fig. 2 is a cross-sectional view of line A-A of fig. 1.

Fig. 3 is a schematic cross-sectional view of the extended-range type light-mixing lens of embodiment 1.

Fig. 4 is a schematic diagram illustrating the light control of the extended-range type light mixing lens of embodiment 1 for a part of incident light.

Fig. 5 is a schematic diagram of the structure of the extended-range type light-mixing lens of embodiment 1 at another viewing angle.

Fig. 6 is a schematic diagram illustrating the light control of another portion of the incident light by the extended-range type light-mixing lens of embodiment 1.

Fig. 7 is a top view of the extended-range type mixing lens of embodiment 1.

Fig. 8 is a simulated light pattern of fig. 6.

Fig. 9 is a schematic diagram of the structure of the extended-range type light mixing lens of embodiment 2.

Fig. 10 is a sectional view of the lighting device of embodiment 3.

Fig. 11 is a graph of simulated light effects of example 3.

Detailed Description

In order that the invention may be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments that are illustrated in the appended drawings. The drawings illustrate preferred embodiments of the invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Example 1

Referring to fig. 1-3, an extended range type light mixing lens 100 is assembled above a light source for mixing and color mixing. The extended-range type light-mixing lens 100 comprises a lens body 200, wherein the lens body 200 has a central axis M, and the lens body 200 is a rotationally symmetrical body formed around the central axis M as a symmetry axis. The lens body 200 is made of transparent optical materials such as PMMA (polymethyl methacrylate), PC (polycarbonate), silica gel or glass, and can be formed by adopting an integral injection molding or engraving process.

The lens body 200 includes a first region 1, a second region 2, and a third region 3, and a total reflection surface 4. Wherein the first region 1, the second region 2 and the third region 3 are located at the lower, middle and upper portions of the lens body 101, respectively. The first region 1, the second region 2 and the third region 3 of the present embodiment are integrally formed. In some embodiments, the first region 1, the second region 2, and the third region 3 may be a split structure, which may be joined together by bonding or ultrasonic welding.

The first area 1 is provided with a first cavity 10, and the first cavity 10 is a light-entering cavity for accommodating a light source (not shown) and receiving light emitted by the light source. I.e. the light emitted by the light source, passes through the first cavity 10 and then enters the lens body 200. The first cavity 10 comprises a first incident surface 11 and a second incident surface 12, wherein the first incident surface 11 is positioned on the side wall of the first cavity 10, and the second incident surface 12 is positioned on the top surface of the first cavity 10. The first region 1 is provided with a first opening 101 in the bottom surface of the first cavity 10. It will be appreciated that the first entrance face 11, the second entrance face 12 and the first opening 101 together form a first cavity 10.

The second region 2 is located above the first region 1, and the second region 2 is provided with a second cavity 20. The second cavity 20 is a light splitting cavity for redistributing light. The second cavity 20 comprises a first exit face 21 and a refractive face 22; the first exit surface 21 is located at the bottom surface of the second cavity 20, and the refractive surface 22 is located at the side wall of the second cavity 20. The second region 2 is provided with a second opening 201 on the top surface of the second cavity 20. The first exit face 21 and the refractive face 22 and the second opening 201 together enclose a second cavity 20.

The third region 3 is located above the second region 2, and the third region 3 is provided with a third cavity 30. The third cavity 30 is a light emitting cavity, that is, the light of the light source is emitted from the third cavity 30 to the outside after the light control treatment is performed by the lens body 200.

In some embodiments, the third cavity 30 may be in communication with the second cavity 20, i.e., the second opening 201 is a bottom opening of the third cavity 30. Part of the light emitted by the light source enters the second cavity 20 after passing through the first area 1, and then exits from the third cavity 30. The third cavity 30 is provided with a second exit surface 32. The second region is provided with a third opening 301 in the top surface of the third cavity 30. The second opening 201, the second exit surface 32 and the third opening 301 together form a third cavity 301. The third region 3 is provided with a flange 31 outside the third opening 301, the flange 31 having an annular structure for fitting into the lamp body.

The total reflection surface 4 is disposed around the first, second and third regions 1,2 and 3, the total reflection surface 4 is an outer sidewall of the lens body 200, and light entering the total reflection surface 4 is totally reflected.

In the present embodiment, as shown in fig. 2, the first cavity 10 and the second cavity 20 are not communicated. The first region 1 is provided with a refractive body 13, the refractive body 13 having a certain thickness. And the refractive body 13 is located between the first cavity 10 and the second cavity 20.

Fig. 3 is a schematic cross-sectional view of the extended-range type light mixing lens of the present embodiment, and referring to fig. 2 and 3, the first incident surface 11 and the second incident surface 12 both receive light emitted by the light source. The first cavity 10 is a conical light-entering cavity, and the first incident surface 11 arranged on the side wall of the first cavity 10 is a collimation cambered surface protruding towards the first cavity 10. In cross section, the collimating cambered surface is a free curve, and the first cavity 10 has a trapezoid-like structure, and the height of the first cavity 10 is h ₁. Wherein the first opening 101 is a circular opening, and the diameter of the first opening 101 is a; the second incident surface 12 at the top of the first cavity 10 is a circular plane, and the diameter of the second incident surface 12 is b. Since the first cavity 10 has a structure of being narrow at the top and wide at the bottom, the diameter a of the first opening 101 is larger than the diameter b of the second incident surface 12, i.e., a > b.

The second chamber 20 is of barrel-like configuration, or cylindrical-like configuration. In the cross section, the second cavity 20 has an inverted trapezoid structure, and the height of the second cavity 20 is h ₂. The first exit surface 21 at the bottom of the second cavity 20 is a circular plane, the diameter of the first exit surface 21 is c, the second opening 201 at the top of the second cavity 20 is a circular opening, and the diameter of the second opening 201 is d. The second cavity 20 has a structure with a wide upper part and a narrow lower part, and the diameter of the second opening 201 is larger than that of the first exit surface 21, i.e. d > c.

In the cross section, the third cavity 30 is also in an inverted trapezoid structure, and the height of the third cavity 30 is h ₃. The third opening 301 at the top of the third cavity 30 is a circular opening, and the diameter of the third opening 301 is e. The third cavity 30 shares the second opening 201 with the second cavity 20, i.e. the second opening 201 is also the bottom surface of the third cavity 30. The third cavity 30 has a structure with a wide upper part and a narrow lower part, and the diameter of the third opening 301 is larger than that of the second opening 201, i.e., e > d.

With further reference to fig. 3, the lens body 200 has a height H and a width W. In order to improve the light mixing effect of the whole extended-range lens 100, the structure and design size of the lens body 200 are optimized in this embodiment, which is specifically as follows:

1. the overall height of the lens body 200 is increased, wherein the value of H/W is 0.5-1.2, preferably H/w=0.7. By increasing the overall height of the lens body 200, the optical path (light path) of the light emitted by the light source in the lens body 200 is also increased, so that the light has enough space in the lens body 200 to mix and mix the light. Therefore, there is a more uniform light mixing effect at the second exit face 32 compared to a conventional lens.

2. The first incident surface 11 located on the side wall of the first cavity 10 is a collimation cambered surface protruding towards the first cavity 10. The first incident surface 11 having the collimating cambered structure can convert part of the light at the center point of the light source into parallel light.

As shown in fig. 4, a portion of light emitted from the center point O of the light source enters the lens body 200 through the first incident surface 11, and the portion of light is a first portion of light L1, and the first portion of light L1 is parallel light. The extension lines of the parallel light rays are also not intersected, and the extension lines are equivalent to the light rays emitted from the light source center point O' which is positioned at a far position, so that the optical path length from the center point O of the actual light source to the first incident surface 11 with the collimation cambered surface structure is increased, namely, the distance of the virtual optical path length is increased. The virtual optical path is understood to mean an irradiation surface from a polychromatic light source to infinity, and the mixed-light color mixing effect on the irradiation surface is absolutely uniform.

In practical applications, the light source is not just a center point O, but a light emitting surface with a certain light emitting area, and the light emitting surface of the multicolor light source is discrete. In order to avoid the problem of reduced color mixing uniformity caused by the extended light source, a first microstructure 111 is added on the surface of the first incident surface 11, and the first microstructure 111 has corrugations arranged in an array.

As shown in fig. 5, the first microstructure 111 of the present embodiment has an elliptical or bar shape, and in other embodiments, the first microstructure may have a circular, triangular, rectangular, pentagonal, or hexagonal shape. Since the first microstructure 111 is added, the first cavity 10 is made to have a structure with a narrow upper portion and a wide lower portion for more convenient molding and demolding in actual production. And the ratio of the diameter a of the first opening 101 to the diameter b of the second entrance face 12 is greater than 2, i.e. a/b > 2; the height of the first chamber 10 is h ₁. Preferably equal to the diameter b of the second entrance face 12, i.e. h ₁ =b.

3. The second cavity 20 is disposed in a second area in the middle of the lens body 200, a refractive body 13 is disposed between the second cavity 20 and the first cavity 10, and the second cavity 20 and the third cavity 30 are mutually communicated. The second cavity 20 has a structure with a wide upper part and a narrow lower part, and the diameter d of the second opening 201 is larger than the diameter c of the first exit surface 21, i.e. d > c. In addition, the height h ₂ of the second cavity 20 is also greater than the diameter c of the first exit surface 21, i.e. h ₂ > c.

As shown in fig. 6, a portion of the light emitted from the center point O of the light source enters the lens body 200 through the second incident surface 12, the portion of the light is a second portion of the light L2, and the second portion of the light L2 enters the second cavity 20 through the first exit surface 21 and finally exits from the third cavity 30.

In addition, the second portion of the light L2 entering the second cavity 20, which is the third portion of the light L3, further enters the lens body 200 from the refracting surface 22. The refractive surface 22 is a plane extending obliquely from the first exit surface 21 to the second opening 201, and the third portion of the light L3 is refracted by the refractive surface 22 and totally reflected by the total reflection surface 4, and then exits from the second exit surface 32.

Fig. 7 is a top view of the extended-range type light mixing lens of embodiment 1, as shown in fig. 7, in some embodiments, a second microstructure 221 is added on the surface of the refractive surface 22, where the second microstructure 221 has corrugations arranged in an array, and the corrugations may be elliptical, bar, circular, triangular, rectangular, pentagonal, or hexagonal. The second microstructures 221 have a reflective function. In other embodiments, a third microstructure 321 is also added to the exit surface of the second exit face 32. Similar to the second microstructures 221, the third microstructures 321 also have an array arrangement of corrugations.

As shown in fig. 8, the second part of light L2 can directly exit from the second cavity; in addition, the second portion of light L2, when entering the refractive surface, forms a fourth portion of light L4 reflected by the second microstructure in addition to the third portion of light re-entering the lens body 200. Therefore, the refractive surface of the second microstructure is added, so that primary light mixing (the fourth part of light L4) and secondary light mixing (the third part of light L3) can be realized at the same time. In some embodiments, in order to make more light re-enter the lens body 200 for secondary mixing, the height h ₂ of the second cavity is made higher, preferably, the ratio of the height h ₂ of the second cavity to the diameter c of the first exit surface 21 needs to be greater than 1.5, i.e. h ₂/c > 1.5.

The extended-range type light mixing lens in the embodiment performs light mixing and color mixing treatment on the light rays through the first area, the second area, the third area and the total reflection surface, prolongs the light ray path, enables the first part of light rays, the second part of light rays and the third part of light rays to be emitted to the outside after all the light rays are subjected to refraction or reflection treatment, ensures the controllability of the light rays and improves the light mixing and color mixing effect.

Example 2

Fig. 9 is a schematic structural diagram of an extended-range type light-mixing lens according to the present embodiment, as shown in fig. 9, in the extended-range type light-mixing lens 100 according to the present embodiment, a fourth microstructure 41 is added on the outer side of the total reflection surface 4, and the fourth microstructure 41 has corrugations arranged in an array. In the fourth microstructure 41, the grating shape is prismatic or parallelogram, and takes on a scaly shape; in other embodiments, the corrugations may be circular, oval, bar-shaped, triangular, rectangular, pentagonal, hexagonal, etc., or may be irregular. The total reflection surface 4 of the fourth microstructure 4 is added, and after the light is totally reflected, the light is emitted from the second reflection surface 32 and the third cavity 30, so that the mixed light and the mixed color can be better carried out. For other structures of the extended-range hybrid lens of the present embodiment, please refer to the related description of embodiment 1, and the description thereof is omitted here.

Example 3

Fig. 10 is a cross-sectional view of a lighting device according to the present embodiment, and as shown in fig. 10, a lighting device includes a light source 200, and the extended range type light mixing lens 100 according to embodiment 1 or embodiment 2, wherein the light source 200 is disposed in the first cavity 10. Specifically, the light source 200 is disposed on the first opening 101. The light source 200 has a light emitting plane that is higher than or flush with the plane of the first opening 101. In other embodiments, the light emitting plane may also be lower than the plane of the first opening 101.

As shown in fig. 11, the simulated light-emitting effect diagram of the lamp adopting the conventional lens is 11A, wherein the middle of the light spot still has the condition of uneven color mixing; in this embodiment, the simulated light-emitting effect diagram of the lighting device using the extended-range type light-mixing lens is 11B, where the whole mixed light of the light spots is uniform.

The lighting device of the embodiment adopts a single extended range type light mixing lens, so that light mixing and color mixing treatment can be carried out on a single or a plurality of light sources, and the extended range type light mixing lens has strong adaptability, so that the light emitting efficiency can reach more than 85 percent.

The foregoing is merely illustrative and explanatory of the invention as it is described in more detail and is not thereby to be construed as limiting the scope of the invention. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the invention, and that these obvious alternatives fall within the scope of the invention.

Claims

1. The utility model provides a range-extending formula light mixing lens, includes the lens body, and the lens body is the rotational symmetry body around the center pin, its characterized in that, the lens body includes:

2. The extended range mixing lens of claim 1, wherein the first region is provided with a refractive body disposed between the first cavity and the second cavity.

3. The extended range mixing lens of claim 1, wherein the first and second entrance surfaces each receive light from a light source; the first incidence surface is arranged on the side wall of the first cavity, and is a collimation cambered surface protruding towards the first cavity.

4. The extended range mixing lens of claim 3, wherein the second incident surface is disposed on a top surface of the first cavity.

5. The extended reach mixing lens of claim 4, wherein the first region has a circular first opening at the bottom, the first opening having a diameter greater than the diameter of the second entrance surface.

6. The extended-range mixing lens of claim 5, wherein, in the light emitted from the light source, wherein:

7. The extended reach mixing lens of claim 6, wherein the first exit surface is a circular plane, the second region has a circular second opening at the top of the second cavity, and the diameter of the second opening is larger than the diameter of the first exit surface.

8. The extended reach mixing lens of claim 7, wherein the refractive surface is a plane extending obliquely from the first exit surface to the second opening;

9. The extended reach mixing lens of claim 8, wherein the third region has a circular third opening at the top of the third cavity, the third opening having a diameter greater than the diameter of the second opening.

10. The extended range mixing lens of claim 1, wherein microstructures are disposed on the first entrance surface, the first exit surface, the second exit surface, and the total reflection surface, respectively.

11. A lighting device comprising a light source and the extended range mixing lens of any one of claims 1-10, said light source being disposed in said first cavity.