CN110887021A - Optical lens and light-emitting device thereof - Google Patents
Optical lens and light-emitting device thereof Download PDFInfo
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- CN110887021A CN110887021A CN201811042127.4A CN201811042127A CN110887021A CN 110887021 A CN110887021 A CN 110887021A CN 201811042127 A CN201811042127 A CN 201811042127A CN 110887021 A CN110887021 A CN 110887021A
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- optical lens
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V5/00—Refractors for light sources
- F21V5/04—Refractors for light sources of lens shape
Abstract
The optical lens and the light emitting device thereof provided by the embodiment of the invention comprise an optical structure which is symmetrical relative to a central optical axis in shape, wherein the optical structure comprises a first concave part and a second concave part, the first concave part is arranged at the central position of the top surface of the lens, and the second concave part is arranged at the central position of the bottom surface of the lens, the second concave part is formed by sinking the bottom surface of the lens towards the top surface direction, the top edge of the longitudinal section of the optical lens is formed by connecting a plurality of lines in sequence, light emitted by the light emitting device is refracted to be mixed with light passing through the surface formed by other lines when passing through the top surface obtained by connecting and rotating the plurality of lines in sequence, so that the distribution uniformity degree of the emitted light is improved, the final display brightness and the uniformity degree of display color of the light are improved, and the problem of uneven light distribution after the refraction of the existing transparent cup is solved, and the brightness and color of light do not show uniformity.
Description
Technical Field
The invention relates to the technical field of LED backlight and illumination, in particular to an optical lens and a light-emitting device thereof.
Background
In the traditional light-emitting device, as the light incident surface with a bell shape is arranged on the lens cup to change the light emitted from the light-emitting device from point light to surface light, specifically, the light is firstly diffused by the first refraction of the light incident surface and then is refracted by the light emergent surface of the lens cup for the second time to diffuse and refract, thereby realizing the surface diffusion of the light of the point light source, however, the light emergent surface of the existing lens cup is designed by adopting a cambered surface, the design can enlarge the included angle between the light and the light, simultaneously, the light can be uniformly distributed after the light is diffused and refracted, especially, the light at the middle part of the lens cup can be outwardly refracted, thereby causing the light color displayed at the middle part and the periphery to be dark, therefore, only one lens structure which can realize the surface light of the point light source and ensure the uniform distribution after the light is refracted is needed to solve the problems, the existing lens can cause the problems of darker brightness and display color in the display area after refracting light.
Disclosure of Invention
The embodiment of the invention provides an optical lens and a light-emitting device thereof, and mainly solves the technical problem that the light distribution of the existing light-emitting device is uneven in the process of refracting the light emitted by a light-emitting device, so that the light brightness and the display color are uneven.
In order to solve the above technical problem, an embodiment of the present invention provides an optical lens, where the optical lens includes an optical structure having a symmetrical shape with respect to a central optical axis, and a supporting pillar disposed on a bottom surface of the optical lens for supporting the optical lens;
the optical structure comprises a first concave part arranged at the center of the top surface of the optical lens and a second concave part arranged at the center of the bottom surface of the optical lens, wherein the second concave part is formed by sinking towards the top surface direction based on the bottom surface of the optical lens, the top edge of the longitudinal section of the optical lens is formed by connecting a plurality of lines in sequence, and the lines comprise at least one of straight lines, curved lines and arc lines.
Further, the second concave part formed by the bottom surface of the optical lens in a concave mode towards the direction of the top surface is in a U-shaped mode, a semi-closed cavity is formed on the optical lens and the bottom surface of the optical lens, and the cross-sectional radius of the cavity is larger than that of the light-emitting device.
Further, a first convex portion protruding outward based on the top surface is provided on a central position of the first concave portion.
Further, a second convex portion is provided in the second concave portion at a position opposite to the first convex portion.
Further, a concave-convex structure is arranged on the bottom surface of the optical lens, and the concave-convex structure is used for diffusing the emergent light reflected by the top surface.
Further, a ratio of a maximum depth of the first recess to a maximum thickness of the optical lens is in a range of 0.08 to 0.12;
a ratio of a maximum width of the first concave portion to a maximum width of the optical lens is in a range of 0.2 to 0.4.
Further, a ratio of a maximum width of the second concave portion to a maximum width of the first concave portion ranges from 0.6 to 0.75.
Further, a ratio of a maximum depth of the second recess to a maximum thickness of the optical lens is in a range of 0.65 to 0.9;
a ratio of a maximum width of the second concave portion to a maximum width of the optical lens is in a range of 0.18 to 0.3.
Further, a first diffusion layer is further disposed on a side surface of the optical lens, and a ratio of a height of the first diffusion layer to a maximum height of the optical lens is in a range of 0.2 to 0.6.
Further, the first diffusion layer is composed of a plurality of irregular prominence and depression structures or a plurality of diffusion grids; wherein the first diffusion layer is integrally formed with a side surface of the optical lens.
Further, a second diffusion layer is arranged on the bottom surface of the optical lens, wherein the second diffusion layer is composed of a plurality of irregular convex-concave structures or a plurality of diffusion grids; wherein the second diffusion layer is integrally formed with a bottom surface of the optical lens.
Further, the orthogonal cross-sectional shape of the diffusion lattice in the direction parallel to the reference optical axis of the optical lens is a triangular shape, a square shape, or a semicircular shape; the diffusion grids are in the shape of a regular square grid, a triangular grid or a hexagonal grid.
In order to solve the technical problem, an embodiment of the present invention further provides a light emitting device, which includes a PCB, at least one light emitting device disposed on the PCB, and at least one optical lens as described above; the optical lens covers and fixes one or more light-emitting devices on the PCB board, and light emitted by the light-emitting devices is uniformly scattered.
Furthermore, the PCB board is also provided with a limiting groove matched with the supporting column of the optical lens, and the optical lens is fixed on the PCB board through the matching of the limiting groove and the supporting column.
Further, the distance from the light emitting device to the first convex portion is a first distance D1, the first distance D1 decreases with the increase of an included angle α 1, the included angle α 1 is the included angle between the first distance D1 and the central optical axis, 0 is equal to or greater than α 1 and equal to or less than β 1, and β 1 is equal to or greater than α 1 and is less than pi/2.
The invention has the beneficial effects that:
according to the optical lens and the light emitting device thereof provided by the embodiment of the invention, the optical lens comprises an optical structure which is symmetrical relative to a central optical axis in shape, the optical structure comprises a first concave part and a second concave part, the first concave part is arranged at the central position of the top surface of the optical lens, and the second concave part is arranged at the central position of the bottom surface of the optical lens, wherein the second concave part is formed by being concave towards the top surface direction based on the bottom surface of the optical lens, the top side of the longitudinal section of the optical lens is formed by connecting a plurality of lines in sequence, the light emitted by the light emitting device is refracted to be mixed with the light passing through the surfaces formed by other lines when passing through the top surface obtained by connecting and rotating a plurality of lines in sequence, so that the refraction angle of each line facing the light is different, and the light on the adjacent surfaces can be mutually crossed and mixed after being refracted, thereby improved the even degree of distribution of the light that jets out, improved the final display luminance of light and the even degree that shows the colour, solved current transparent cup refraction back light and distributed inhomogeneously, and led the luminance of light and the even problem of colour also not showing.
Furthermore, the top surface is obtained by adopting a design mode of a plurality of lines, so that the effect of simplifying the processing technology is achieved in the production of the top surface, the production efficiency is improved, and meanwhile, the use experience of a user is greatly improved due to the design of the top surface.
Drawings
Fig. 1 is a schematic structural diagram of a light-emitting device according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an optical lens according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a second structure of an optical lens according to an embodiment of the invention;
FIG. 4 is a schematic diagram illustrating a distribution of refracted light rays of an optical lens according to an embodiment of the present invention;
FIG. 5 is a perspective view of an optical lens provided by an embodiment of the invention;
FIG. 6 is another perspective view of an optical lens provided by an embodiment of the invention;
FIG. 7 is a schematic view of another optical lens structure provided in an embodiment of the present invention;
FIG. 8 is a schematic diagram of a third structure of an optical lens according to an embodiment of the invention;
fig. 9 is a schematic diagram of a fourth structure of an optical lens according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The first embodiment is as follows:
referring to fig. 1, fig. 1 is a schematic structural diagram of a light emitting device according to an embodiment of the present invention, the light emitting device includes a PCB 11, at least one light emitting device 12 and an optical lens 10, wherein the at least one light emitting device 12 is respectively disposed on the PCB 11, and light emitted by the light emitting device 12 is adjusted through the optical lens 10, and the optical lens 10 and the light emitting device are mutually matched, attached and fixed on the PCB 1.
In this embodiment, the light emitting device further includes a supporting pillar 13 disposed on the bottom surface of the optical lens 10 for supporting the lens, and the supporting pillar 13 is made of a material similar to that of the optical lens 10.
In this embodiment, the PCB 11 is further provided with a limiting groove 14 matching with the supporting member 13, and the optical lens 10 is fixed on the PCB by the matching of the limiting groove 14 and the supporting member 13.
In practical application, the PCB 11 is further provided with a circuit board of an electronic circuit and a driving circuit, the light emitting device 12 is disposed on the PCB 11 and electrically connected to the electronic circuit and the driving circuit on the PCB 11, and the optical lens 10 covers the light emitting device 12 and covers the light emitting device 12, so that light emitted from the light emitting device 12 is refracted by the optical lens 10 to form a light plane.
In the embodiment of the present invention, the connection between the optical lens 10 and the PCB 11 can be further fixed by glue, and the optical lens 10 is fixed on the PCB 11 by coating a glue layer between the support pillar 13 on the optical lens 10 and the PCB 11, where the glue layer may be double-sided tape, sticky paint, or the like.
In this embodiment, the optical lens 10 includes an optical structure having a symmetrical shape with respect to a central optical axis, and the optical structure includes a first concave portion 1021b and a second concave portion 1023, wherein the first concave portion 1021b is disposed at a central position of a top surface 1021 of the optical lens 10, the second concave portion 1023 is disposed at a central position of a bottom surface of the optical lens 10, the second concave portion 1023 is formed by being recessed in a direction of the top surface 1021 based on a bottom surface of the optical lens 10, the second concave portion 1023 has a U-shaped surface, which is a light incident surface 1022 of the light emitting device, the top surface 1021 is a curved surface formed by a plurality of planes 1021a, wherein the planes 1021a are sequentially connected with the central optical axis of the optical lens 10 as a center, and finally form an arc-shaped curved surface of the optical lens 10, which is the top surface.
In practical applications, the optical lens 10 has a concave-like shape in a longitudinal section, and the corresponding side of the top surface 1021 in the longitudinal section is the top side of the longitudinal section, i.e. the top side
The top side of the shape is formed by sequentially connecting a plurality of lines, the top side is an arc-shaped arc line as a whole, the lines comprise at least one of straight lines, curved lines and arc-shaped lines, as shown in fig. 1, the arc lines at the distances a-b and c-d are formed by sequentially connecting a plurality of straight lines, the overall shape is an arc-shaped line segment, the corresponding light emitting surface is obtained by rotating based on the central optical axis, the arc lines at the distances b-c are formed by sequentially connecting a plurality of curved lines or arc lines, the overall shape is an arc-shaped line segment, and the corresponding light emitting surface is obtained by rotating based on the central optical axis.
In this embodiment, the second concave portion 1023 formed by the bottom surface of the optical lens 10 being concave in the direction of the top surface 1021 is U-shaped, and forms a semi-closed cavity with the bottom surface of the optical lens 10 on the optical lens 10, wherein the cross-sectional radius of the cavity is larger than that of the light emitting device 12.
In this embodiment, a first convex part 1024 protruding outward from the top surface 1021 is disposed at the center of the first concave part 1021b, and the first convex part 1024 is disposed on the top surface of the first concave part 1021b, so that the first convex part 1024 can refract the refracted light to the track where the light is mixed with other light, and the problem of uneven light distribution in the middle area of the conventional light emitting device and uneven brightness of the light due to the refraction of the first convex part 1024 is solved.
In practical applications, the specific structure of the optical lens 10 is implemented by using the lens structure shown in fig. 2, and as shown in fig. 2, the optical lens 10 may be specifically divided into two parts, namely a first lens portion 101 and a second lens portion 102, and the two parts are made of the same material, but different shapes and structures exist, such as a transparent resin material and the like.
In practical applications, the first lens portion 101 and the second optical lens 102 may be integrally formed or separately formed, and then assembled, preferably integrally formed, the first lens portion 101 is provided with a through hole in the middle, the through hole and the second concave portion 1023 on the second lens portion 102 form a semi-closed cavity for accommodating the light emitting device 12, and light emitted by the light emitting device 12 during operation is refracted from the light incident surface on the second concave portion 1023 to the top surface 1021 and the first convex portion on the first concave portion 1023 On the portion 1024.
As shown in fig. 2, the second concave portion 1023 is formed by the bottom of the second lens 1102 being concave toward the light emitting surface 1021, the light emitting surface 1021 is a curved surface formed by a plurality of planes 1021a, and the light emitted by the light emitting device 12 is refracted to be mixed with the light passing through the other planes 1021a on the light emitting surface 1021 when passing through the planes 1021a of the light emitting surface 1021, optionally, when the second concave portion 1023 is disposed, a certain amount of light can be increased according to actual conditions, that is, at least one second concave portion 1023 can be disposed on the same optical lens 10. In addition, an optical lens 10 may be provided with a second concave portion 1023, and one optical lens 10 may cover one light emitting device 12 correspondingly.
In practical applications, since the second lens portion 102 is disposed above the first lens portion 101, and in practical installation, the first lens portion 101 is in contact with the light emitting device 12, the second concave portion 1023 here should extend from the second transparent portion 102 to the bottom surface of the first lens portion 101, or a through hole matched with the second concave portion 1023 is also disposed at a position corresponding to the second concave portion 1023 in the first lens portion 101, the through hole completely penetrates the first lens portion 101, and the light emitting device 12 is disposed at the position of the through hole and emits light to the light incident surface 1022 of the second concave portion 1023.
In practical applications, the light incident surface 1022 is disposed on the inner side surface of the front surface of the second concave portion 1023, and light emitted by the light emitting device 12 directly strikes the side surface of the second concave portion 1023 and strikes each plane 1021a of the light emitting surface 1021 under refraction of the side surface.
In the present embodiment, the first lens portion 101 may be designed as a cylindrical lens, such as a cylindrical lens, a triangular prism lens, a polygonal prism lens, etc., preferably, a triangular prism is selected here, and the vertical light emitting surface of the triangular prism lens is also designed as a circular arc surface, and the second lens portion 102 is arranged on the light emitting side surface, the circular arc surface is tangent to the second lens portion 102, and three corner portions protrude, so that when the optical lens 10 is installed on the light emitting device, a user can hold the optical lens 10 by the position of the corner.
In practical application, the first lens portion 101 is designed to be a cylindrical lens, and mainly plays a role in deflecting light emitted by the light emitting device upwards, the light emitted to the first lens portion 101 is large-angle light, the influence on the optical effect is small, and the light is theoretically made into a vertical cylindrical surface, but for convenience of demolding and production, the light is generally set to be cylindrical in a shape, but the side inclination angle of the cylindrical surface is within 6 degrees, and preferably, when the first lens portion 101 and the second lens portion 102 are processed, the ratio of the two is generally greater than 1.
In this embodiment, the second lens portion 102 is a hemispherical lens disposed on the triangular prism lens, and the bottom surface of the hemispherical lens is tangent to the three circular arc curved surfaces of the triangular prism lens.
In some embodiments of the present invention, the first lens portion 101 may also be directly configured as a cylindrical lens, and when configured as a cylindrical lens, the second lens portion 102 is disposed on the first lens portion 101, and the first lens portion 101 and the second lens portion 102 may be assembled concentrically.
In this embodiment, in order to further improve the uniformity of the refraction distribution of the light, a first concave portion 1021b is disposed at a middle position of the light exit surface 1021, and the position of the first concave portion 1021b is located on the reference optical axis Z of the second lens portion 102.
In this embodiment, a second protrusion 1022a is further disposed on the top of the light incident surface 1022, and the emitted light is emitted from the light emitting surface 1021 after being incident on the second protrusion 1022a and being mixed for a plurality of times by the tapered surface of the second protrusion 1022 a.
In practical applications, the first convex part 1021b and the second convex part 1022a may be both disposed on the same optical lens 10, or only one of them may be selected for disposing, and preferably both of them are selected to make the light beam at the central optical axis position of the optical lens 10 more uniform.
In the present embodiment, based on the optical lens 10 structure provided in fig. 2, the distance from the light source disposed in the optical lens 10 to the light exit surface 1021 and the distance from the light source to the light entrance surface 1022 are changed specifically as shown in fig. 4, on the light exit surface 1021, the distance from the point C to the point a increases with the increase of the included angle between the light ray and the reference optical axis, and on the light entrance surface 1022, the distance from the light source to the light entrance surface 1022 decreases with the increase of the included angle between the light ray and the reference optical axis.
In this embodiment, when a second protrusion 1022a is further disposed on the light incident surface 1022, specifically, as shown in fig. 3, on the light emitting surface 1021, a rule of distance change from a point C to a point a increases with an increase of an included angle between the light ray and the reference optical axis, on the light incident surface 1022, a rule of distance change on the second protrusion 1022a increases with an increase of an included angle between the light ray and the reference optical axis, and a rule of distance change outside the second protrusion 1022a decreases with an increase of an included angle between the light ray and the reference optical axis, because the second protrusion 1022a is disposed at a top position of the light incident surface 1022, that is, the light incident surface corresponding to the second protrusion 1022a, a rule of change of a light distance of the light incident surface is changed, so that a rule of light ray exiting from the light incident surface is changed, and an exiting direction is closer to the reference optical axis, therefore, light rays within a certain distance range with the reference optical axis as the center can be mutually crossed and mixed, and the brightness of the light rays in the middle area is improved.
In this embodiment, the light emitting surface 1021 is a curved surface formed by a plurality of planes, so that the light rays refracted onto each plane 1021a of the light emitting surface 1021 are refracted and deflected onto the adjacent plane 1021a, so that the light rays are cross-mixed after being refracted and emitted, the light mixing can improve the brightness and the display color of the finally displayed light rays, and the design of realizing the cross-connection can also improve the distribution condition of the light rays.
In practical applications, the arrangement of the second convex part 1022a on the light incident surface 1022 should be considered comprehensively according to the actual size of the optical lens 10, and is not suitable to be too large, because the second convex part 1022a mainly functions to refract the light within a certain distance range centered on the second convex part 1022a to realize cross mixing with the light outside the certain distance range centered on the second convex part 1022a, thereby improving the brightness of the emitted light, when the second convex part 1022a is too large, a certain influence is exerted on the optical effect of the light emitting device, and when the arrangement is too small, the problem of uneven distribution of the light cannot be solved, and the processing is not easy to be performed, generally, the depth of the concave point is required to be more than 0.02mm, the influence on the optical effect is small, and the light emitting device can be processed at the same time.
In the present embodiment, when designing the optical lens 10, specifically, by changing the ratio of the first concave portion 1021b and the second concave portion 1023 on the optical lens 10 to the main body of the optical lens 10, the main body here can be understood as the first lens portion and the second lens portion in fig. 2.
In practical applications, as shown in fig. 7, in the proportion of the first concave portion 1021b on the optical lens 10, specifically, the ratio of the maximum depth b of the first concave portion 1021b to the maximum thickness h of the lens is in the range of 0.08 to 0.12, and preferably, the ratio is set to 0.102, so that the change of light rays is further increased.
In this embodiment, a ratio of the maximum width a of the first concave portion 1021b to the maximum width of the optical lens 10 is set in a range of 0.2 to 0.4, and preferably, the ratio is set to 0.35, which is more likely to cause a change in light.
In this embodiment, the ratio of the maximum width c of the second concave portion 1023 to the maximum width a of the first concave portion 1021a is set in the range of 0.6 to 0.85, and preferably, the ratio is set to 0.62, which is more likely to change the light.
In this embodiment, the ratio of the maximum depth d of the second concave portion 1023 to the maximum thickness h of the optical lens 10 is set in the range of 0.65 to 0.9, and preferably, the ratio is set to 0.78, so that the change of the light is more serious.
In this embodiment, the ratio of the maximum width c of the second concave portion 1023 to the maximum width of the optical lens 10 is set in the range of 0.18 to 0.3, and preferably, the light processing is further performed when the selection ratio is 0.21.
In the present embodiment, as shown in fig. 8, in order to increase uniform refraction of light, a first diffusion layer 103 is further disposed on a side surface of the optical lens 10, and a ratio of a height of the first diffusion layer 103 to a maximum height of the optical lens 10 is in a range of 0.2 to 0.6.
In practical applications, the first diffusion layer 103 is composed of a plurality of irregular convex-concave structures or a plurality of diffusion grids; wherein the first diffusion layer 103 is integrally formed with the side surface of the optical lens 10, and the orthogonal cross-sectional shape of the diffusion grid in the direction perpendicular to the central normal of the optical lens is a triangular shape, a square shape or a semicircular shape; the diffusion grids are in the shape of a regular square grid, a triangular grid or a hexagonal grid.
In the present embodiment, in addition to providing a diffusion layer on the side surface of the optical lens 10, a layer may also be provided on the bottom surface of the optical lens 10, that is, a second diffusion layer 1011 is further provided on the bottom surface of the optical lens 10, wherein the second diffusion layer 1011 is composed of a plurality of irregular convex-concave structures or a plurality of diffusion grids; wherein the second diffusion layer 1011 is integrally formed with the bottom surface of the optical lens 10, as shown in fig. 3.
In practical applications, the first diffusion layer 103 and the second diffusion layer 1011 can be set up by selecting at least one of them according to different product requirements, as shown in fig. 9, i have a schematic structure of setting up both layers at the same time, which can satisfy both the bottom surface and side surface astigmatism requirements.
As shown in fig. 3 and 6, in this embodiment, in order to further control the optical effect of the optical lens 10 after refracting light, an uneven structure 1011 is further disposed on the bottom surface of the first lens portion 101, and the uneven structure 1011 is mainly used for diffusing the light emitted from the light emitting surface, optionally, the uneven structure 1011 is a regular quadrangular pyramid, and may be even a hemispherical structure, as long as the structure can diffuse the light reflected from the light incident surface 1022 or the top surface 1021.
In the present embodiment, the distance from the light emitting device to the second protrusion is a first distance D1, the first distance D1 decreases with an increase in an included angle α 1, the included angle α 1 is an included angle between the first distance D1 and the central optical axis, 0 ≦ α 01 ≦ β 1, β 1 ≦ α 11 ≦ 3611 < π/2, that is, the distance D1 from the base point O of the lens to the P point of the light exit surface as in FIG. 7, when 0 ≦ α 1 ≦ β 1, the distance D1 decreases with an increase in α 1, and when β 1 ≦ α < π/2, the distance D1 increases with an increase in α 1.
In this embodiment, since the first concave portion 1021b is disposed on the light emitting surface 1021b, although the disposition of the first concave portion 1021b may improve the uniform distribution of light refracted to the periphery to a certain extent, there may be less light in the middle of the first concave portion 1021b, in order to solve such a problem, in this embodiment, a first convex portion 1024 is further disposed on the middle of the first concave portion 1021b, and by disposing the first convex portion 1024, not only the light refracted onto the refraction surface is refracted again to realize cross-mixing of the light at both sides of the reference optical axis, but also the distance change rule from the light source to the light emitting surface of the existing light emitting surface is changed, in the distance change from the light emitting surface 1024 to the light source in this embodiment, first, the distance change from the first convex portion 1024 is reduced along with the increase of the included angle between the light and the reference optical axis, and the change rule outside the first convex portion 1024 is increased along with the increase of the included angle between the light and the reference optical axis . In practical applications, the first convex portion 1024 is one of a conical convex point, a hemispherical convex point and a pyramid convex point.
As shown in fig. 3 and 5, in this embodiment, in order to further control the optical effect of the optical lens 10 after refracting light, an uneven structure 1011 is further disposed on the bottom surface of the first lens portion 101, and the uneven structure 1011 is mainly used for diffusing the light emitted from the light emitting surface, optionally, the uneven structure 1011 is a regular quadrangular pyramid, and may be even a hemispherical structure, as long as the structure can diffuse the light reflected from the light incident surface 1022 or the light emitting surface 1021.
In this embodiment, when the optical lens 10 is mounted on a circuit board on which a light emitting device is located and covers the light emitting device, in order to facilitate mounting/assembling, at least two supporting pillars 13 are further disposed on the bottom surface of the first lens portion 101, and the supporting pillars 13 are used in cooperation with limiting grooves on the circuit board during assembling, so that limiting and fixed mounting of the lens can be achieved, thereby greatly improving the assembling efficiency, and also improving the reuse utilization rate of the lens, optionally, three supporting pillars 13 are selectively disposed, and an isosceles triangle is formed between the three supporting pillars 13, so that not only limiting can be achieved, but also the optimal mounting direction of the lens can be determined, thereby achieving the maximum optical effect of the lens.
In this embodiment, when the first lens portion 101 is configured as a rhomboid lens with a circular arc curved surface, as shown in fig. 6, after the second optical lens 102 is assembled with the first lens portion 101, there are three bosses 103 protruding outwards, and the bosses 103 are configured to facilitate the lens installation for the user.
According to the lens provided by the embodiment of the invention, the second convex part is arranged on at least one light incident surface arranged on the second lens part, the second convex part can refract the refracted light to the track of the other refracted light for light mixing, and the problem that the light distribution of the existing transparent cup in the middle area is uneven, so that the brightness of the light is also uneven is solved after the refraction of the second convex part.
In this embodiment, the optical lens is made of at least one of polymethyl methacrylate plastic, vinyl silicone, PC plastic, PMMA acrylic, and glass.
In practical application, the size of the lens is generally set to be between 10 and 23mm, the size is a common size in the market at present, and in order to further solve the defect of uneven light mixing in the prior art, the lens in the embodiment of the invention can also be set to be 10mm to 13.5mm in the whole size, so that the lens is suitable for a smaller installation environment, the production efficiency of the lens is improved, the cost is reduced, and the space of equipment can be saved.
For a lens with a dimension of between 10mm and 13.5mm, the ratio between the first concave part, the second concave part and the lens can be set as follows:
the ratio of the maximum depth b of the first recess to the maximum thickness h of the body of the lens is 0.085 to 0.11.
The ratio of the maximum depth d of the second recess to the maximum thickness h of the body of the lens is 0.7 to 0.9.
The ratio of the maximum depth d of the second recess to the maximum depth b of the first recess is 6.5-9.5.
The ratio of the maximum width a of the first recess to the maximum width of the body of the lens is 0.25 to 0.38.
The ratio of the maximum width c of the second recess to the maximum width of the body of the lens is 0.18-0.3.
The ratio of the maximum width c of the second recess to the maximum width a of the first recess is 0.7-0.85.
In summary, the optical lens and the light emitting device thereof according to the embodiments of the present invention include an optical structure having a symmetrical shape with respect to a central optical axis, the optical structure includes a first concave portion and a second concave portion, the first concave portion is disposed at a central position of a top surface of the lens, and the second concave portion is disposed at a central position of a bottom surface of the lens, wherein the second concave portion is formed by being recessed in a top surface direction based on the bottom surface of the lens, a top side of a longitudinal section of the optical lens is formed by sequentially connecting a plurality of lines, and light emitted from the light emitting device is refracted to be mixed with light passing through a surface formed by other lines when passing through a top surface obtained by sequentially rotating the plurality of lines, so that refraction angles of each line with respect to the light are different, and light on adjacent facets can be mixed with each other after being refracted, thereby improved the even degree of distribution of the light that jets out, improved the final display luminance of light and the even degree that shows the colour, solved current transparent cup refraction back light and distributed inhomogeneously, and led the luminance of light and the even problem of colour also not showing.
The LED provided in the foregoing embodiments can be applied to various light emitting fields, for example, it can be manufactured into a backlight module applied to a display backlight field (which can be a backlight module of a terminal such as a television, a display, a mobile phone, etc.). It can be applied to a backlight module at this time. The display backlight module can be applied to the fields of display backlight, key backlight, shooting, household lighting, medical lighting, decoration, automobiles, traffic and the like. When the LED backlight source is applied to the key backlight field, the LED backlight source can be used as a key backlight light source of mobile phones, calculators, keyboards and other devices with keys; when the camera is applied to the field of shooting, a flash lamp of a camera can be manufactured; when the lamp is applied to the field of household illumination, the lamp can be made into a floor lamp, a table lamp, an illuminating lamp, a ceiling lamp, a down lamp, a projection lamp and the like; when the lamp is applied to the field of medical illumination, the lamp can be made into an operating lamp, a low-electromagnetic illuminating lamp and the like; when the decorative material is applied to the decorative field, the decorative material can be made into various decorative lamps, such as various colored lamps, landscape illuminating lamps and advertising lamps; when the material is applied to the field of automobiles, the material can be made into automobile lamps, automobile indicating lamps and the like; when the lamp is applied to the traffic field, various traffic lights and various street lamps can be manufactured. The above applications are only a few applications exemplified by the present embodiment, and it should be understood that the application of the LED in the present embodiment is not limited to the above exemplified fields.
The foregoing is a more detailed description of embodiments of the present invention, and the present invention is not to be considered limited to such descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (15)
1. An optical lens, comprising: the optical structure is symmetrical relative to a central optical axis, and the supporting column is arranged on the bottom surface of the optical lens and used for supporting the optical lens;
the optical structure includes a first concave portion provided at a center position of a top surface of the optical lens, and a second concave portion provided at a center position of a bottom surface of the optical lens, wherein the second concave portion is formed by being depressed in a direction toward the top surface based on a bottom surface of the optical lens; the top edge of the longitudinal section of the optical lens is formed by sequentially connecting a plurality of lines, and the lines comprise at least one of straight lines, curved lines and arc lines.
2. The optical lens of claim 1 wherein the second recess formed by the bottom surface of the lens recessed in the direction of the top surface is U-shaped and forms a semi-enclosed cavity with the bottom surface of the lens in the lens, the cavity having a cross-sectional radius larger than the cross-sectional radius of the light emitting device.
3. The optical lens according to claim 2, wherein a first convex portion that is convex outward based on the top surface is provided on a central position of the first concave portion.
4. The optical lens of claim 3, wherein a second convex portion is further provided in the second concave portion at a position opposite to the first convex portion.
5. The optical lens of claim 2, further comprising a relief structure on a bottom surface of the optical lens for diffusing the emitted light reflected by the top surface.
6. The optical lens of claim 5 wherein a ratio of a maximum depth of the first recess to a maximum thickness of the optical lens is in a range of 0.08 to 0.12;
a ratio of a maximum width of the first concave portion to a maximum width of the optical lens is in a range of 0.2 to 0.4.
7. The optical lens of claim 6 wherein a ratio of a maximum width of the second recess to a maximum width of the first recess is in a range of 0.6 to 0.75.
8. The optical lens of claim 7 wherein a ratio of a maximum depth of the second recess to a maximum thickness of the optical lens is in a range of 0.65 to 0.9;
a ratio of a maximum width of the second concave portion to a maximum width of the optical lens is in a range of 0.18 to 0.3.
9. The optical lens of claim 8, wherein a first diffusion layer is further disposed on a side surface of the optical lens, and a ratio of a height of the first diffusion layer to a maximum height of the optical lens is in a range of 0.2 to 0.6.
10. The optical lens of any of claims 1-9, wherein the first diffusion layer is comprised of a plurality of irregular asperities or a plurality of diffusion cells; wherein the first diffusion layer is integrally formed with a side surface of the optical lens.
11. The optical lens of claim 10, further comprising a second diffusion layer disposed on a bottom surface of the optical lens, wherein the second diffusion layer is composed of a plurality of irregular prominence and depression structures or a plurality of diffusion cells; wherein the second diffusion layer is integrally formed with a bottom surface of the optical lens.
12. The optical lens of claim 12 wherein the orthogonal cross-sectional shape of the diffusion cell in a direction parallel to the reference optical axis of the optical lens is a triangular shape or a square shape or a semicircular shape; the diffusion grids are in the shape of a regular square grid, a triangular grid or a hexagonal grid.
13. A light-emitting apparatus, comprising a PCB board, at least one light-emitting device disposed on the PCB board, and at least one optical lens according to any one of claims 1 to 12; the optical lens covers and fixes one or more light-emitting devices on the PCB board, and light emitted by the light-emitting devices is uniformly scattered.
14. The lighting device according to claim 13, wherein the PCB board further has a positioning groove for engaging with the supporting pillar of the optical lens, and the optical lens is fixed on the PCB board by the engagement of the positioning groove and the supporting pillar.
15. The light-emitting apparatus according to claim 13 or 14, wherein a distance from the light-emitting device to the first convex portion is a first distance D1, the first distance D1 decreases with an increase in an included angle α 1, the included angle α 1 is an included angle between the first distance D1 and the central optical axis, 0 ≦ α 1 ≦ β 1, and β 1 ≦ α 1 ≦ pi/2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811042127.4A CN110887021A (en) | 2018-09-07 | 2018-09-07 | Optical lens and light-emitting device thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811042127.4A CN110887021A (en) | 2018-09-07 | 2018-09-07 | Optical lens and light-emitting device thereof |
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| CN110887021A true CN110887021A (en) | 2020-03-17 |
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| CN201811042127.4A Pending CN110887021A (en) | 2018-09-07 | 2018-09-07 | Optical lens and light-emitting device thereof |
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