CN213777604U - Light diffusion lens and lighting device - Google Patents
Light diffusion lens and lighting device Download PDFInfo
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- CN213777604U CN213777604U CN202023338809.5U CN202023338809U CN213777604U CN 213777604 U CN213777604 U CN 213777604U CN 202023338809 U CN202023338809 U CN 202023338809U CN 213777604 U CN213777604 U CN 213777604U
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Abstract
The utility model discloses a light diffusion lens and a lighting device, wherein the light diffusion lens comprises a main body which is in a rotational symmetry axis structure; the middle position of the bottom surface of the main body is recessed to form a light incident surface; an annular light-emitting surface is formed on the periphery of the main body and faces to one side far away from the bottom of the main body; the surface of the main body is a total reflection surface except the light incident surface and the annular light emergent surface; the top surface of the main body is recessed to form a first total reflection surface; and the side wall of the main body forms a second annular total reflection surface. The light entering the light diffusion lens is reflected by the second total reflection surface and the first total reflection surface for multiple times and then is emitted from the light emitting surface, the deflection angle of the light near the light emitting surface is basically large enough, so that the light is not required to be deflected greatly when being emitted from the light emitting surface finally, the incident angle on the light emitting surface is not larger than the critical angle, total reflection does not exist, and the diffusion angle of the novel light diffusion lens is larger than that of a hyperboloid lens.
Description
Technical Field
The utility model relates to the field of lighting technology, especially, relate to a light diffusion lens and include light diffusion lens's lighting device.
Background
Light Emitting Diodes (LEDs) are widely used in various fields, especially in the field of backlight illumination, as an efficient light source with many features such as environmental protection, power saving, and long lifetime. In the field of backlight illumination, in order to uniform light, a light emitting diode light source is usually used in combination with a diffusion lens, so that light of the light emitting diode light source can be emitted at a large angle, and the effect of large-area illumination is achieved.
Referring to fig. 1a, fig. 1a is a schematic structural diagram of a light diffusion lens 100 provided in the prior art, the light diffusion lens 100 includes a light incident surface 121, a light emitting surface 122, and an annular lens body 123 connecting the light incident surface 121 and the light emitting surface 122, one side of the lens body 123 is provided with a first groove 1231, the other side of the lens body 123 is provided with a protrusion 1232, the light incident surface 121 is a bottom surface of the first groove 1231, the light emitting surface 122 is a surface of the protrusion 1232, and a central region of the light emitting surface 122 is provided with a second groove 124. The diffusion lens 120 has a rotational symmetry axis passing through the light incident surface 121 and the light emitting surface 122, and both the light incident surface 121 and the light emitting surface 122 of the diffusion lens 120 are rotationally symmetric with respect to the rotational symmetry axis.
The light emitted from the light source 130 enters the diffusion lens 120 through the light incident surface 121, wherein most of the light refracts out of the diffusion lens 120 through the light emergent surface 122, and a small portion of the light is totally reflected in the lens body 123 and cannot exit from the light emergent surface 122, so that a small portion of the light exits from other surfaces (e.g., the lower surface shown in fig. 1 a). As shown, the diffusion angle is also small, and the light path of the light emitted from the light source 130 in the diffusion lens 120 is short, the color mixing effect is limited, so that the yellow-blue separation phenomenon is often observed.
Referring to fig. 1b, fig. 1b is a schematic structural diagram of another light diffusing lens 200 provided in the prior art, which has a structure similar to that of the light diffusing lens 100, and includes a light incident surface 221, a light emitting surface 222, a lens body 223, a first groove 2231, and a second groove 224. The light diffusion lens 200 and the light diffusion lens 100 have the same technical problem. That is, in the light diffusing lens 200, all the light entering from the light entering surface 221 cannot be emitted from the light emitting surface 222, and a small portion of the light is emitted from another surface (e.g., the upper surface shown in fig. 1 b).
Therefore, there is a need to develop a new type of light diffusing lens to overcome the drawbacks of the prior art.
SUMMERY OF THE UTILITY MODEL
The main objective of the present invention is to provide a light diffusion lens and a lighting device, which can solve the problems of the prior art that the diffusion angle of the diffusion lens is small, the color mixing effect of the light in the diffusion lens is limited, and the yellow-blue separation is caused.
In order to achieve the above object, the present invention provides a light diffusing lens, which includes a main body having a rotational symmetry axis structure; the middle position of the bottom surface of the main body is recessed to form a light incident surface; an annular light-emitting surface is formed on the periphery of the main body and faces to one side far away from the bottom of the main body; except for the light incident surface and the annular light emergent surface, the surface of the main body is a total reflection surface.
Further, in one embodiment, the top surface of the main body is recessed to form a first total reflection surface; the side wall of the main body forms an annular second total reflection surface, the second total reflection surface is positioned between the light incident surface and the light emergent surface, and the second total reflection surface faces to one side far away from the top of the main body; the light incident surface, the second total reflection surface, the light emitting surface and the first total reflection surface sequentially surround the main body.
Further, in one embodiment, the light incident surface is used for receiving light from the outside; the second total reflection surface is used for reflecting the light rays from the light incident surface; the first total reflection surface is used for reflecting the light rays from the light incident surface and the second total reflection surface; the light emitting surface is used for emitting the light rays from the light incident surface, the second total reflection surface and the first total reflection surface.
Further, in one embodiment, the longitudinal section of the main body along the rotational symmetry axis thereof is wing-shaped.
Further, in one embodiment, the optical cavity is formed at a middle position of the bottom surface of the main body and is located on the rotational symmetry axis of the main body.
Further, in one embodiment, the light incident surface is a conical surface, and the first total reflection surface is a conical surface.
Further, in one embodiment, the light incident surface is a curved surface, and in the longitudinal section, the light incident surface is gradually away from the rotational symmetry axis from top to bottom, and the slope of the light incident surface gradually decreases from being close to the rotational symmetry axis to being away from the rotational symmetry axis.
Further, in one embodiment, the second total reflection surface is a curved surface, and on the longitudinal section, the second total reflection surface gradually gets away from the rotational symmetry axis from bottom to top, and the slope of the second total reflection surface gradually increases from a direction close to the rotational symmetry axis to a direction away from the rotational symmetry axis.
Further, in one embodiment, the first total reflection surface is a curved surface, and in the longitudinal section, the first total reflection surface gradually gets away from the rotational symmetry axis from bottom to top, and the slope of the first total reflection surface gradually decreases from the direction close to the rotational symmetry axis to the direction away from the rotational symmetry axis.
Further, in one embodiment, the light-emitting surface is formed in a ring shape, and the light-emitting surface gradually gets away from the rotational symmetry axis from top to bottom in the longitudinal section.
Further, in one embodiment, the light rays entering from the light incident surface are parallel to each other in the reflection light rays of the first total reflection surface.
Further, in one embodiment, the light entering from the light incident surface is totally reflected at the second total reflection surface to generate a reflected light, and then totally reflected at the first total reflection surface.
Further, in one embodiment, the reflected light beams generated by total reflection from the second total reflection surface are parallel to each other at the first total reflection surface.
Further, in one embodiment, the refractive index of the lens ranges from 1 to 2.
Further, in one embodiment, the surface of the light diffusion lens has a microstructure and/or the surface of the light diffusion lens is frosted and roughened.
In order to achieve the above object, the present invention further provides a lighting device, including the light diffusion lens according to the present invention; the light source plate is arranged on one side of the light incoming surface, and the bottom surface of the light diffusion lens is connected with the light source plate; the light source is arranged on the light source plate and located in the light cavity of the light diffusion lens, and a gap exists between the light source and the light incoming surface.
Further, in one embodiment, the bottom surface of the light diffusion lens is connected to the light source board by using an adhesive.
Compared with the known technology, the utility model has the advantages that: the utility model provides a light diffusion lens and lighting device, the light that gets into lens is through being emergent by play plain noodles after the many times total reflection of second total reflection face and first total reflection face, and the deflection angle of the light near play plain noodles has been enough big basically, so finally need not carrying out great deflection when going out the plain noodles and emitting, so the incident angle on going out the plain noodles can not be greater than critical angle, does not have the total reflection, and the diffusion angle of this kind of neotype light diffusion lens can be bigger than hyperboloid lens.
Furthermore, light rays entering the lens are reflected and refracted through total reflection for many times in the lens, the optical path is long enough, light can be mixed and mixed well in the lens, and the color consistency of emergent light is greatly improved.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of the embodiments of the present invention with reference to the accompanying drawings.
FIG. 1a is a schematic diagram of a light diffusing lens according to the prior art;
FIG. 1b is a schematic diagram of another light-diffusing lens provided in the prior art;
fig. 2 is a schematic structural diagram of a light diffusion lens according to an embodiment of the present invention;
fig. 3 is a schematic view of an optical path of light rays on a first total reflection surface in a light diffusion lens provided in an embodiment of the present invention;
fig. 4 is a schematic view illustrating a first total reflection surface width of a light diffusion lens according to an embodiment of the present invention;
fig. 5 is a schematic view of an optical path of a light diffusion lens provided in embodiment 1 of the present invention;
fig. 6 is a schematic structural diagram of an illumination device according to an embodiment of the present invention.
Description of reference numerals in the background art:
a light diffusing lens-100; a light incident surface-121;
a light-emitting surface-122; a lens body-123;
a first groove-1231; bump-1232;
a second groove-124;
a light diffusion lens-200; a light incident surface-221;
a light-emitting surface-222; a lens body-223;
a first groove-2231; a second groove-224.
Description of the reference numerals in the detailed description:
a light diffusing lens-300; a body-310;
rotational symmetry axis-101; a light incident surface-301;
bottom surface-302; a second total reflection surface-303;
a light-emitting surface-304; a first total reflection surface-305;
an optical cavity-306;
a light source plate-400; a light source-500;
lighting device-10.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.
The embodiment of the present invention provides a light diffusion lens 300, please refer to fig. 2, wherein the light diffusion lens 300 includes a main body 310, a light incident surface 301, a connecting surface 302, a second total reflection surface 303, a light emitting surface 304, a first total reflection surface 305 and a light cavity 306.
The body 310 has a rotationally symmetric structure. More specifically, the rotational symmetry of the body 310 has an axis of rotational symmetry 101, and the body has an airfoil shape in longitudinal section along its axis of rotational symmetry 101. It should be noted that the rotational symmetry axis 101 is drawn by a dashed line in fig. 2, and its function is merely a reference line for description. The longitudinal section is a section of the main body 310 taken longitudinally along the rotational symmetry axis, and the plan view shown in fig. 2 is used to show the longitudinal sectional structure of the main body 310, so that the longitudinal section is not marked or indexed.
The middle position of the bottom surface of the main body 310 is recessed to form an optical cavity 306, and the optical cavity 306 is located on the rotational symmetry axis 101 of the main body 310 and is used for placing a light source.
The light incident surface 301 is located on the inner side wall of the light cavity 306. Further, in this embodiment, the inner sidewall of the light cavity 306 becomes the light incident surface 301. The light incident surface 301 is a curved surface and is integrally represented as a conical surface, on the longitudinal section, the light incident surface 301 is gradually far away from the rotational symmetry axis 101 from top to bottom, and the slope of the light incident surface 301 gradually decreases from being close to the rotational symmetry axis 101 to being far away from the rotational symmetry axis 101. The plane where the connecting surface 302 is located is used as a reference surface, and the light incident surface 301 is a concave surface relative to the reference surface. The light incident surface 301 is used for receiving light from an external light source.
An annular light emitting surface 304 is formed around the main body 310, and the annular light emitting surface 304 faces a side away from the bottom of the main body 310. In this embodiment, the light emitting surface 304 forms a ring shape, the light emitting surface 304 connects the second total reflection surface 303 and the first total reflection surface 305, and in the longitudinal section, the light emitting surface 304 gradually gets away from the rotational symmetry axis 101 from top to bottom. The light emitting surface 304 is used for emitting the light from the light incident surface 301, the light from the second total reflection surface 303, and the light from the first total reflection surface 305.
The top surface of the main body 310 is recessed to form the first total reflection surface 305. In this embodiment, the upper sidewall of the main body 310 is the first total reflection surface 305. The first total reflection surface 305 is a curved surface and is integrally represented as a conical surface, and on the longitudinal section, the first total reflection surface 305 is gradually away from the rotational symmetry axis 101 from bottom to top, and the slope thereof gradually decreases from the direction close to the rotational symmetry axis 101 to the direction away from the rotational symmetry axis 101. The first total reflection surface 305 is convex relative to the reference surface, which is the plane where the connection surface 302 is located. The first total reflection surface 305 is used for reflecting the light from the light incident surface 301 and the light from the second total reflection surface 303.
The side wall of the main body 310 forms the second total reflection surface 303 in a ring shape, and the second total reflection surface 303 is located between the light incident surface 301 and the light emitting surface 304, and faces to a side away from the top of the main body 310. In this embodiment, the lower sidewall of the main body 310 becomes the second total reflection surface 303. The second total reflection surface 303 is a curved surface, on the longitudinal section, the second total reflection surface 303 is gradually away from the rotational symmetry axis 101 from bottom to top, and the slope of the second total reflection surface 303 gradually increases from the direction close to the rotational symmetry axis 101 to the direction away from the rotational symmetry axis 101. The plane where the connection surface 302 is located is taken as a reference surface, and the second total reflection surface 303 is a concave surface relative to the reference surface. The second total reflection surface 303 is used for reflecting the light from the light incident surface 301.
The light incident surface 301, the connection surface 302, the second total reflection surface 303, the connection surface 307, the light emitting surface 304, and the first total reflection surface 305 sequentially surround the main body. More specifically, in the present embodiment, the light incident surface 301, the connection surface 302, the second total reflection surface 303, the light emitting surface 304, and the first total reflection surface 305 surround the main body together. On the longitudinal section, one end of the light incident surface 301 on one side of the rotational symmetry axis 101 is connected to the connecting surface 302, and the other end is connected to the light incident surface 301 on the other side of the rotational symmetry axis 101; one end of the connecting surface 302 is connected with the second total reflection surface 303, and the other end is connected with the light incident surface 301; one end of the second total reflection surface 303 is connected with the light emitting surface 304, and the other end is connected with the connection surface 302; one end of the light emitting surface 304 is connected to the second total reflection surface 303, and the other end is connected to the first total reflection surface 305; one end of the first total reflection surface 305 is connected to the light emitting surface 304, and the other end is connected to the first total reflection surface 305 on the other side of the rotational symmetry axis 101.
Referring to fig. 3, fig. 3 is a schematic diagram of an optical path of a light beam when the light beam is totally reflected on the first total reflection surface 305. The first total reflection surface 305 is a curved surface, and light entering from the light incident surface 301 is totally reflected on the first total reflection surface 305, where θ1The angle of incidence of the light on the light incident surface 301 is α, which is an included angle between the normal of the light incident surface 301 and the normal of the first total reflection surface 305.
To achieve total reflection of light at the first total reflection surface 305, θ1And alpha needs to satisfy the following conditions: alpha is alpha>arcsin(1/n)+arcsin(1/n·sinθ1) Wherein n is the refractive index of the lens material. In this embodiment, polycarbonate is used as the lens material, and the refractive index n is 1.586.
Please refer to FIG. 4, FIG. 4 isThe width of the first total reflection surface 305 is schematically defined. The total emission of light on the first total reflection surface 305 is realized, and the width W of the first total reflection surface 305 needs to satisfy the following condition: w>h3·tanθ2+W1Wherein, h3Is the height difference between the incident surface 301 and the first total reflection surface 305, θ2Is the angle of refraction, W, of a light ray entering from the input surface 3011Is the distance from a point on the planar structure of the light incident surface 301 to the axis of rotational symmetry 101.
In this embodiment, the curvature of the curved surface of the first total reflection surface 305 satisfies that the reflected light beams of the light entering from the light incident surface 301 after being totally reflected by the first total reflection surface 305 are parallel to each other, so that the lens has a larger light emitting angle.
Referring to fig. 5, fig. 5 is a schematic view of an optical path of a light ray in the light diffusing lens 300, particularly a schematic view of an optical path of a light ray totally reflected on the second total reflection surface 303. The second total reflection surface 303 is a curved surface, and a part of the light entering from the light incident surface 301 is reflected by the second total reflection surface 303 and then is totally reflected by the first total reflection surface 305. Where a is an incident angle of the light ray on the light incident surface 301, c is a refraction angle of the light ray on the second total reflection surface 303, and d is an incident angle of the light ray on the first total reflection surface 305.
In order to realize total reflection of light at both the second total reflection surface 303 and the first total reflection surface 305, c and d need to satisfy the following conditions: c > arcsin (1/n) and d > arcsin (1/n), wherein n is the refractive index of the lens material. In this embodiment, polycarbonate is used as the lens material, and the refractive index n is 1.586.
In this embodiment, the curvature of the curved surface of the second total reflecting surface 301 is such that the reflected light beams generated by the total reflection of the second total reflecting surface 303 are parallel to each other on the first total reflecting surface 305.
According to Maxwell's equation, the continuous condition on the boundary derives the refraction and reflection formula of the light on the interface of two media. The intensity of refraction and reflection being dependent on polarization, electric vectorThe quantity perpendicular to the interface is s-light and parallel to the interface is p-light. ThetaiFor the incident angle, n1 is the refractive index of the entrance medium and n2 is the refractive index of the refractive medium, it can be seen that the intensity of the reflected light is related to the incident angle, and a characteristic of the fresnel reflective material itself. In this embodiment, n1 is equal to 1 and n2 is 1.586.
Theoretically, when all the light rays on the second total reflection surface 301 and the first total reflection surface 305 are totally reflected by 100%, the area right above the lens is a dark area, but because the fresnel reflection exists in the material itself and the total reflection surface is actually not totally reflected by 100%, a small part of stray light is projected from the total reflection surface without total reflection, and a certain light energy distribution exists right above the light diffusion lens 300, so that the brightness requirement near the area right above the lens can be just met.
In order to improve the light mixing effect of the lens, the surface of the light diffusion lens 300 may have a microstructure and/or the surface of the lens may be frosted and roughened. The light-emitting surface 304 of the light diffusing lens 300 may have a microstructure and/or be roughened by frosting, and the microstructure may be a three-dimensional microstructure such as pyramid, hemisphere, and semi-ellipsoid.
Referring to fig. 6, the present embodiment provides an illumination device 10, and the illumination device 10 includes the light diffusion lens 300, the light source board 400 and the light source 500.
The light source plate 400 is disposed on one side of the light incident surface 301. In this embodiment, the connecting surface 302 may be connected to the light source board 400, for example, may be connected to the light source board 400 by using an adhesive, but other connecting methods may also be used.
The light source 500 is arranged on the light source plate 400 and is positioned in the light cavity 306 of the light diffusion lens, and a gap exists between the light source 500 and the light incident surface 301.
As shown in fig. 5 and fig. 6, the light emitted from the light source 500 can enter the light diffusion lens 300 from the light incident surface 301, and the second total reflection surface 303 is used for reflecting the light entering from the light incident surface 301; the first total reflection surface 305 is used for reflecting the light entering from the light incident surface and the light reflected by the second total reflection surface 303; the light emitting surface 304 is used for emitting light, for example, the light from the light incident surface 301, the light from the second total reflection surface 303, and the light from the first total reflection surface 305 can be emitted.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The light diffusion lens and the lighting device provided by the embodiments of the present invention are described in detail above, and the principle and the implementation of the present invention are explained by applying specific examples herein, and the description of the above embodiments is only used to help understanding the technical solution and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present invention in its various embodiments.
Claims (13)
1. The light diffusion lens is characterized by comprising a main body, wherein the main body is of a rotational symmetry axis structure; the middle position of the bottom surface of the main body is recessed to form a light incident surface; an annular light-emitting surface is formed on the periphery of the main body and faces to one side far away from the bottom of the main body; the top surface of the main body on the inner side of the annular light-emitting surface is recessed to form a first total reflection surface; the side wall of the main body forms an annular second total reflection surface, the second total reflection surface is positioned between the light incident surface and the light emergent surface, and the second total reflection surface faces to one side far away from the top of the main body; the light incident surface, the second total reflection surface, the light emitting surface and the first total reflection surface sequentially surround the main body.
2. The light diffusing lens of claim 1, wherein the light incident surface is configured to receive light from an outside; the second total reflection surface is used for reflecting the light rays from the light incident surface; the first total reflection surface is used for reflecting the light rays from the light incident surface and the second total reflection surface; the light emitting surface is used for emitting the light rays from the light incident surface, the second total reflection surface and the first total reflection surface.
3. The light diffusing lens of claim 1 wherein said body has a wing shape in longitudinal section along its rotational axis of symmetry.
4. The light diffusing lens according to claim 1,
the light incident surface is a conical surface, and the first total reflection surface is a conical surface.
5. The light diffusing lens according to claim 3,
the light incident surface is a curved surface, on the longitudinal section, the light incident surface is gradually far away from the rotational symmetry axis from top to bottom, and the slope of the light incident surface is gradually reduced from being close to the rotational symmetry axis to being far away from the rotational symmetry axis.
6. The light diffusing lens according to claim 3,
the second total reflection surface is a curved surface, on the longitudinal section, the second total reflection surface is gradually far away from the rotational symmetry axis from bottom to top, and the slope of the second total reflection surface is gradually increased from the direction close to the rotational symmetry axis to the direction far away from the rotational symmetry axis.
7. The light diffusing lens according to claim 3,
the first total reflection surface is a curved surface, and on the longitudinal section, the first total reflection surface is gradually far away from the rotational symmetry axis from bottom to top, and the slope of the first total reflection surface is gradually reduced from the direction close to the rotational symmetry axis to the direction far away from the rotational symmetry axis.
8. The light diffusing lens according to claim 3,
the light-emitting surface is annular, and on the longitudinal section, the light-emitting surface gradually keeps away from the rotational symmetry axis from top to bottom.
9. The light diffusing lens according to claim 2,
the light rays entering from the light incident surface are parallel to each other in the reflection light rays of the first total reflection surface.
10. The light diffusing lens according to claim 1,
the refractive index range of the light diffusion lens is 1-2.
11. The light diffusing lens according to claim 1,
the surface of the light diffusion lens is provided with a microstructure and/or the surface of the light diffusion lens is subjected to frosting and roughening treatment.
12. An illumination device, comprising
The light diffusing lens of any one of claims 1-11;
the light source plate is arranged on one side of the light incoming surface, and the bottom surface of the light diffusion lens is connected with the light source plate;
the light source is arranged on the light source plate and located in the light cavity of the light diffusion lens, and a gap exists between the light source and the light incoming surface.
13. The lighting device of claim 12,
the bottom surface of the light diffusion lens is connected with the light source plate in a viscose mode.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023338809.5U CN213777604U (en) | 2020-12-31 | 2020-12-31 | Light diffusion lens and lighting device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023338809.5U CN213777604U (en) | 2020-12-31 | 2020-12-31 | Light diffusion lens and lighting device |
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| CN213777604U true CN213777604U (en) | 2021-07-23 |
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