Progressive light mixing lens and illumination device

Abstract

The application discloses a range-extending mixed light lens, which comprises a lens body, the lens body is a rotationally symmetrical body around a central axis, the lens body comprises a first region, a second region, a third region and a total reflection surface, the first region is provided with a first cavity, the first cavity comprises a first incident surface and a second incident surface; the second region is arranged above the first region, the second region is provided with a second cavity, the second cavity comprises a first emission surface and a refractive surface; the third region is arranged above the second region, the third region is provided with a third cavity, the third cavity is provided with a second emission surface; and the total reflection surface is arranged around the periphery of the first region, the second region and the third region. The range-extending mixed light lens performs mixed light and mixed color processing on light through the first region, the second region, the third region and the total reflection surface, and the light emission efficiency is improved. The application further provides a lighting device comprising the range-extending mixed light lens.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of light mixing illuminating devices, and in particular to a range-extending light mixing lens and an illuminating device. BACKGROUND

[0002] An LED lamp is a kind of solid-state semiconductor device capable of directly converting electric energy into light energy, and can emit light of different wavelengths and colors by using different types of light-emitting chips. In the structure of an LED lamp, a combination of an LED chip, fluorescent glue, and a lens is generally used. The fluorescent glue is coated on the surface of the LED chip, and the lens is covered above the LED chip. The monochromatic light emitted by the LED chip excites the fluorescent powder in the fluorescent glue to emit light, and the monochromatic light that is not absorbed by the fluorescent powder is mixed to form white light. The white light is processed by the lens and then emitted to the outside. Due to the existence of color temperature difference in the LED chip and the fluorescent powder, multi-color light mixing is required.

[0003] In the traditional multi-color light mixing scheme, the light mixing structure of a single light source generally uses the following methods for light mixing: (1) a diffusion film or a diffusion sheet is added above the ordinary lens to achieve uniform light mixing; (2) a light guide column is added to mix the light of multi-color light sources together and then perform light distribution. The light mixing structure of multiple light sources generally adjusts the light mixing effect by using the array between different light sources. However, whether it is single light source or multi-light source light mixing, there is a situation of uneven color mixing at the edge of the light source or in the center of the light spot.

[0004] The prior art discloses a full internal reflection lens for uniform light mixing, which comprises a lens body, the size of the lens body gradually decreases from top to bottom, the bottom of the lens body is provided with a containing cavity for mounting an LED, the containing cavity is arranged at the center of the bottom of the lens body, the inner wall of the containing cavity is provided with a strip-shaped pattern for enhancing the light mixing effect, a red LED, a green LED, a blue LED, and a white LED are mounted in the containing cavity, the side surface of the lens body is provided with a scale for refracting light, the top of the lens body is provided with a compound eye for emitting light and a light shielding part for preventing light from directly passing through the compound eye, the light shielding part is arranged at the center of the top of the lens body, and the inside of the lens body is provided with a transparent bead different from the refractive index of the lens body. The light emitted by the LED in the containing cavity of the full internal reflection lens first passes through the strip-shaped pattern for light mixing, then passes through the scale for refracting for second light mixing, and finally passes through the compound eye for third light mixing, so that the light can be reflected and refracted multiple times in the lens body. The light path of the lens is relatively complex. SUMMARY

[0005] In order to solve the above problems, the application provides a range extender light mixing lens, which mixes light through a first area, a second area, a third area and a total reflection surface, thereby improving light output efficiency. The application also provides a lighting device comprising the range extender light mixing lens.

[0006] In order to achieve the above-mentioned purpose, the application provides the following technical solutions.

[0007] The range extender light mixing lens comprises a lens body which is a rotationally symmetrical body around a central axis, and the lens body comprises:

[0008] The first area is provided with a first cavity, and the first cavity comprises a first incident surface and a second incident surface;

[0009] The second area is arranged above the first area, and the second area is provided with a second cavity, and the second cavity comprises a first exit surface and a refractive surface;

[0010] The third area is arranged above the second area, and the third area is provided with a third cavity, and the third cavity is provided with a second exit surface; and

[0011] The total reflection surface is arranged around the periphery of the first area, the second area and the third area.

[0012] In one preferred embodiment, the first area is provided with a refractive body, and the refractive body is arranged between the first cavity and the second cavity.

[0013] In one preferred embodiment, the first incident surface and the second incident surface both receive light emitted by a light source; wherein the first incident surface is arranged on the side wall of the first cavity, and the first incident surface is a collimating arc surface which is convex to the first cavity.

[0014] In one preferred embodiment, the second incident surface is arranged on the top surface of the first cavity.

[0015] In one preferred embodiment, the first area is provided with a circular first opening at the bottom, and the diameter of the first opening is greater than the diameter of the second incident surface.

[0016] In one preferred embodiment, among the light emitted by the light source, the light entering the lens body from the first incident surface is first part light, the first part light is parallel light, and the first part light is totally reflected by the total reflection surface and then exits from the second exit surface.

[0017] In one preferred embodiment, among the light emitted by the light source, the light entering the lens body from the first incident surface is first part light, the first part light is parallel light, and the first part light is totally reflected by the total reflection surface and then exits from the second exit surface.

[0018] The light rays entering the lens body from the second incidence surface are second part light rays, which enter the second cavity through the first exit surface and finally exit from the third cavity.

[0019] In one preferred embodiment, the first exit surface is a circular plane, and the second region is provided with a circular second opening at the top of the second cavity, the diameter of the second opening being larger than that of the first exit surface.

[0020] In one preferred embodiment, the refractive surface is a plane extending obliquely from the first exit surface to the second opening.

[0021] The second part light rays entering the second cavity re-enter the lens body from the refractive surface to form third part light rays, which exit from the second exit surface after total reflection from the total reflection surface.

[0022] In one preferred embodiment, the third region is provided with a circular third opening at the top of the third cavity, the diameter of the third opening being larger than that of the second opening.

[0023] In one preferred embodiment, the first incidence surface, the first exit surface, the second exit surface and the total reflection surface are respectively provided with microstructures.

[0024] The application also provides a lighting device, which comprises a light source and the above-mentioned range-extended light mixing lens, and the light source is arranged in the first cavity.

[0025] Based on the above technical solutions, the application achieves the following technical effects:

[0026] 1. The range-extended light mixing lens provided by the application mixes and colors the light rays through the first region, the second region, the third region and the total reflection surface, prolongs the light ray path, and makes the first part light rays, the second part light rays and the third part light rays all undergo refraction or reflection processing before exiting to the outside, thereby ensuring the controllability of the light rays and improving the light mixing and coloring effect.

[0027] 2. The lighting device of the application uses a single range-extended light mixing lens to mix and color the light of a single or multiple light sources, and the range-extended light mixing lens has strong adaptability, so that the light output efficiency of the lighting device can reach more than 85%. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 FIG. 1 is a structural schematic view of the range-extended light mixing lens of Example 1.

[0029] Figure 2 FIG. 2 is a structural schematic view of the range-extended light mixing lens of Example 2. Figure 1A cross-sectional view of line AA.

[0030] Figure 3 This is a cross-sectional schematic diagram of the range-extending mixing lens of Example 1.

[0031] Figure 4 This is a schematic diagram of the range extender mixing lens of Example 1 controlling a portion of the incident light.

[0032] Figure 5 This is a schematic diagram of the range extender mixing lens of Example 1 from another perspective.

[0033] Figure 6 This is a schematic diagram of the range extender mixing lens of Example 1 controlling the light of another portion of the incident light.

[0034] Figure 7 This is a top view of the range extender mixing lens of Example 1.

[0035] Figure 8 for Figure 6 The simulated light pattern.

[0036] Figure 9 This is a schematic diagram of the range extender mixing lens in Example 2.

[0037] Figure 10 This is a cross-sectional view of the lighting device in Example 3.

[0038] Figure 11 This is a simulated light emission effect diagram of Example 3. Detailed Implementation

[0039] To facilitate understanding of the present invention, a more comprehensive description will be given below in conjunction with the accompanying drawings and specific embodiments. The drawings illustrate preferred embodiments of the invention. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0040] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component.

[0041] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terminology used in the specification of the present application herein is only for the purpose of describing the specific embodiments and is not intended to limit the present application.

[0043] Embodiment 1

[0044] In combination with reference Figures 1-3 A range-extended light mixing lens 100 is arranged above a light source to mix light and color. The range-extended light mixing lens 100 includes a lens body 200, the lens body 200 has a central axis M, and the lens body 200 is a rotationally symmetric body formed around the central axis M as the axis of symmetry. The lens body 200 is made of transparent optical materials such as PMMA (polymethyl methacrylate), PC (polycarbonate), silica gel or glass, which can be made by one-piece injection molding or carving process.

[0045] The lens body 200 includes a first region 1, a second region 2 and a third region 3, and a total reflection surface 4. The first region 1, the second region 2 and the third region 3 are located at the lower part, the middle part and the upper part 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 can be a split structure, which can be connected together by bonding or ultrasonic welding.

[0046] The first region 1 is provided with a first cavity 10, which is a light inlet cavity for accommodating a light source (not labeled in the figure) and receiving light emitted by the light source. That is, the light emitted by the light source first passes through the first cavity 10 and then enters the lens body 200. The first cavity 10 includes a first incident surface 11 and a second incident surface 12, wherein the first incident surface 11 is located on the side wall of the first cavity 10, and the second incident surface 12 is located on the top surface of the first cavity 10. The first region 1 is provided with a first opening 101 on the bottom surface of the first cavity 10. It can be understood that the first incident surface 11, the second incident surface 12 and the first opening 101 together form the first cavity 10.

[0047] The second region 2 is located above the first region 1, and a second cavity 20 is formed in the second region 2. The second cavity 20 is a beam-splitting cavity used to redistribute light. The second cavity 20 includes a first exit surface 21 and a refractive surface 22; wherein, the first exit surface 21 is located on the bottom surface of the second cavity 20, and the refractive surface 22 is located on the side wall of the second cavity 20. A second opening 201 is formed on the top surface of the second cavity 20 in the second region 2. The first exit surface 21, the refractive surface 22, and the second opening 201 together form the second cavity 20.

[0048] The third region 3 is located above the second region 2, and the third region 3 has a third cavity 30. The third cavity 30 is a light-emitting cavity, that is, the light from the light source is emitted to the outside after being controlled by the lens body 200.

[0049] In some embodiments, the third cavity 30 may be interconnected with the second cavity 20, i.e., the second opening 201 is the 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 region 1, and then exits from the third cavity 30. The third cavity 30 is provided with a second exit surface 32. The second region has a third opening 301 on the top surface of the third cavity 30. The second opening 201, the second exit surface 32, and the third opening 301 together form the third cavity 301. The third region 3 has a protruding edge 31 on the outer side of the third opening 301. The protruding edge 31 has an annular structure and is used for embedding and installation into the lamp body.

[0050] The total reflection surface 4 is arranged around the periphery of the first region 1, the second region 2 and the third region 3. The total reflection surface 4 is the outer wall of the lens body 200, and all light entering the total reflection surface 4 will be reflected.

[0051] In such Figure 2 As shown, in this embodiment, the first cavity 10 and the second cavity 20 are not connected. A refractive element 13 is provided in the first region 1, and the refractive element 13 has a certain thickness. The refractive element 13 is located between the first cavity 10 and the second cavity 20.

[0052] Figure 3 This is a cross-sectional schematic diagram of the range-extended mixing lens in this embodiment, in conjunction with reference to the reference. Figure 2 and Figure 3The first incident surface 11 and the second incident surface 12 both receive the light emitted by the light source. The first cavity 10 is a tapered light-incident cavity, and the first incident surface 11 arranged on the side wall of the first cavity 10 is a collimating arc surface protruding towards the first cavity 10. In the cross section, the collimating arc surface is a free curve, and the first cavity 10 has a trapezoidal structure, and the height of the first cavity 10 is h1. The first opening 101 is a circular opening, and the diameter of the first opening 101 is a; the second incident surface 12 arranged on 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 greater than the diameter b of the second incident surface 12, i.e. a > b.

[0053] The second cavity 20 has a barrel structure or a columnar structure. In the cross section, the second cavity 20 has an inverted trapezoidal structure, and the height of the second cavity 20 is h2. The first exit surface 21 arranged on the bottom of the second cavity 20 is a circular plane, and the diameter of the first exit surface 21 is c; the second opening 201 arranged on the top of the second cavity 20 is also a circular opening, and the diameter of the second opening 201 is d. The second cavity 20 has a structure of being wide at the top and narrow at the bottom, and the diameter d of the second opening 201 is greater than the diameter c of the first exit surface 21, i.e. d > c.

[0054] In the cross section, the third cavity 30 also has an inverted trapezoidal structure, and the height of the third cavity 30 is h3. The third opening 301 arranged on the top of the third cavity 30 is a circular opening, and the diameter of the third opening 301 is e. The second opening 201 is shared by the third cavity 30 and 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 of being wide at the top and narrow at the bottom, and the diameter e of the third opening 301 is greater than the diameter d of the second opening 201, i.e. e > d.

[0055] Further referring to Figure 3 The height of the lens body 200 is H, and the width is W. In order to improve the light mixing effect of the entire extended-range lens 100, the structure and design size of the lens body 200 are optimized in the embodiment, and the specific optimization is as follows:

[0056] 1. The overall height of the lens body 200 is increased, wherein the value of H / W is 0.5-1.2, and 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 inside the lens body 200 is also increased, so that the light has enough space to mix inside the lens body 200. Therefore, compared with the conventional lens, the light mixing effect at the second exit surface 32 is more uniform.

[0057] 2. The first incident surface 11 located on the side wall of the first cavity 10 is a collimated arc surface convex to the first cavity 10. The first incident surface 11 with the collimated arc surface structure can convert part of the light rays at the center point of the light source into parallel light.

[0058] like Figure 4 As shown, a portion of the light rays emitted from the center point O of the light source enters the lens body 200 through the first incident surface 11. This portion of light rays is the first portion of light rays L1, which is a parallel ray. The extensions of the parallel rays do not intersect, which is equivalent to light rays emitted from the center point O' of the light source located at a distance. This is equivalent to increasing the optical path from the actual center point O of the light source to the first incident surface 11 with the collimated arc surface structure, that is, increasing the virtual optical path distance. The virtual optical path can be understood as the light mixing and color mixing effect on the illumination surface at an infinite distance when illuminated by a multi-color light source.

[0059] In practical applications, since the light source is not just a central point O, but a light-emitting surface with a certain light-emitting area, and the light-emitting surface of a 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 to the surface of the first incident surface 11. The first microstructure 111 has a grid pattern arranged in an array.

[0060] like Figure 5 As shown, the grid shape of the first microstructure 111 in this embodiment is elliptical or striped. In other embodiments, the shape of the first microstructure can also be circular, triangular, rectangular, pentagonal, or hexagonal, etc. Due to the addition of the first microstructure 111, the first cavity 10 is made with a structure that is narrower at the top and wider at the bottom to facilitate molding and demolding in actual production. Furthermore, the ratio of the diameter a of the first opening 101 to the diameter b of the second incident surface 12 is greater than 2, i.e., a / b > 2; the height of the first cavity 10 is h1. Preferably, it is equal to the diameter b of the second incident surface 12, i.e., h1 = b.

[0061] 3. A second cavity 20 is located in the second region of the lens body 200. The second cavity 20, which has a quasi-cylindrical structure, has a refractive element 13 between it and the first cavity 10. The second cavity 20 is interconnected with the third cavity 30. The second cavity 20 has a structure that is wider at the top and narrower at the bottom. The diameter d of the second opening 201 is greater than the diameter c of the first exit surface 21, i.e., d > c. Furthermore, the height h2 of the second cavity 20 is also greater than the diameter c of the first exit surface 21, i.e., h2 > c.

[0062] like Figure 6As shown, part of the light rays emitted from the center point O of the light source enter the lens body 200 through the second incidence surface 12, which is the second part of light rays L2, the second part of light rays L2 enters the second cavity 20 through the first exit surface 21, and finally exits from the third cavity 30.

[0063] In addition, the second part of light rays L2 entering the second cavity 20 will also re-enter the lens body 200 from the refractive surface 22, which is the third part of light rays L3. The refractive surface 22 is a plane extending obliquely from the first exit surface 21 to the second opening 201, and the third part of light rays L3 is refracted through the refractive surface 22 and totally reflected by the total reflection surface 4, and then exits from the second exit surface 32.

[0064] Figure 7 As shown in FIG. 7, a top view of the range extender mixed light lens of Embodiment 1, in some embodiments, a second microstructure 221 is added to the surface of the refractive surface 22, the second microstructure 221 has a grid pattern arranged in an array, and the shape of the grid pattern can be oval, strip, circle, triangle, rectangle, pentagon or hexagon, etc. The second microstructure 221 has a reflecting function. In other embodiments, a third microstructure 321 is also added to the exit surface of the second exit surface 32. Similar to the second microstructure 221, the third microstructure 321 also has a grid pattern arranged in an array.

[0065] As Figure 8 , the second part of light rays L2 can directly exit in the second cavity; in addition, when the second part of light rays L2 enters the refractive surface, in addition to the third part of light rays that re-enter the lens body 200, a fourth part of light rays L4 that is reflected by the second microstructure will also be formed. It can be seen that the refractive surface with the added second microstructure can simultaneously realize primary light mixing (the fourth part of light rays L4) and secondary light mixing (the third part of light rays L3). In some embodiments, in order to allow more light rays to re-enter the lens body 200 for secondary light mixing, the height h2 of the second cavity is made relatively high, and preferably, the ratio of the height h2 of the second cavity to the diameter c of the first exit surface 21 needs to be greater than 1.5, i.e. h2 / c>1.5.

[0066] The range extender mixed light lens of the present embodiment mixes and colors the light rays through the first region, the second region, the third region and the total reflection surface, prolongs the light ray path, and ensures the controllability of the light rays by making the first part of light rays, the second part of light rays and the third part of light rays all undergo refractive or reflective treatment before exiting to the outside, thereby improving the light mixing and color mixing effect.

[0067] Embodiment 2

[0068] Figure 9 The structure diagram of the range extender mixed light lens of the present embodiment is shown in FIG. Figure 9As shown in the embodiment, in the range-extending light mixing lens 100, the fourth microstructure 41 is added outside the total reflection surface 4, and the fourth microstructure 41 has a grid pattern arranged in an array. In the fourth microstructure 41, the grid pattern is in the shape of a lozenge or a parallelogram, and has a scale shape. In other embodiments, the grid pattern can also be in the shape of a circle, an ellipse, a strip, a triangle, a rectangle, a pentagon, a hexagon, or some irregular structure. The total reflection surface 4 added with the fourth microstructure 4 can better mix light after total reflection of the light and emission from the second reflection surface 32 and the third cavity 30. For other structures of the range-extending light mixing lens of the embodiment, refer to the related description of Embodiment 1, which will not be described here.

[0069] Embodiment 3

[0070] Figure 10 As shown in the cross-sectional view of the lighting device of the embodiment, Figure 10 A lighting device includes a light source 200 and the range-extending light mixing lens 100 of Embodiment 1 or Embodiment 2, and the light source 200 is arranged in the first cavity 10. Specifically, the light source 200 is arranged on the first opening 101. The light source 200 has a light-emitting plane, and the light-emitting plane is higher than or flush with the plane on which the first opening 101 is located. In other embodiments, the light-emitting plane can also be lower than the plane on which the first opening 101 is located.

[0071] As shown in the simulation light-emitting effect diagram of the lamp with a traditional lens, Figure 11 the middle of the light spot still has uneven color mixing; and the simulation light-emitting effect diagram of the lighting device of the embodiment using the range-extending light mixing lens is 11B, in which the light spot has uniform color mixing and light mixing.

[0072] The lighting device of the embodiment uses a single range-extending light mixing lens to perform light mixing and color mixing on a single light source or multiple light sources. The range-extending light mixing lens has strong adaptability, and the light-emitting efficiency can reach more than 85%.

[0073] The above merely illustrates and describes the structure of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the scope of the present application. It should be noted that, for those skilled in the art, without departing from the concept of the present application, some modifications and improvements can be made, and these obvious alternative forms all belong to the protection scope of the present application.

Claims

1. A range extender light mixing lens comprising a lens body which is a rotationally symmetric body about a central axis, characterized in that, The lens body comprises: a first region, which is provided with a first cavity, the first cavity comprising a first incident surface and a second incident surface; a second region, which is arranged above the first region, the second region being provided with a second cavity, the second cavity comprising a first exit surface and a refractive surface; a third region, which is arranged above the second region, the third region being provided with a third cavity, the third cavity being provided with a second exit surface; and a total reflection surface, which is arranged around the periphery of the first region, the second region and the third region; the first incident surface, the first exit surface, the second exit surface and the total reflection surface are respectively provided with microstructures; the height of the lens body is H, the width of the lens body is W, and the value of H / W is 0.5-1.2; the first incident surface and the second incident surface both receive light emitted by a light source, the first incident surface is arranged on the side wall of the first cavity, and the first incident surface is a collimating arc surface protruding towards the first cavity; the second cavity has a structure of being wide at the top and narrow at the bottom, and the ratio of the height h2 of the second cavity to the diameter c of the first exit surface needs to be greater than 1.

5.

2. The range-extending hybrid light mixing lens of claim 1, wherein, The first region is provided with a refractive body, which is arranged between the first cavity and the second cavity.

3. The range-extending hybrid light mixing lens of claim 1, wherein, The second incident surface is arranged on the top surface of the first cavity.

4. The range-extending light mixing lens of claim 3, wherein, The first region is provided with a circular first opening at the bottom, and the diameter of the first opening is greater than the diameter of the second incident surface.

5. The range-extending light mixing lens of claim 4, wherein, Among the light emitted by the light source: the light entering the lens body from the first incident surface is the first part of light, the first part of light is parallel light, and the first part of light is totally reflected by the total reflection surface and then exits from the second exit surface; the light entering the lens body from the second incident surface is the second part of light, the second part of light enters the second cavity through the first exit surface, and finally exits from the third cavity.

6. The range-extending light mixing lens of claim 5, wherein, The first exit surface is a circular plane, the second region is provided with a circular second opening at the top of the second cavity, and the diameter of the second opening is greater than the diameter of the first exit surface.

7. The range-extending light mixing lens of claim 6, wherein, 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 re-enters the lens body from the refractive surface to form the third part of light, and the third part of light is totally reflected by the total reflection surface and then exits from the second exit surface.

8. The range-extending light mixing lens of claim 7, wherein, 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 greater than the diameter of the second opening.

9. An illumination device characterized by The light source is arranged in the first cavity.

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