CN117190126A - Ultra-low glare lighting lens and lamp - Google Patents
Ultra-low glare lighting lens and lamp Download PDFInfo
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- CN117190126A CN117190126A CN202311366438.7A CN202311366438A CN117190126A CN 117190126 A CN117190126 A CN 117190126A CN 202311366438 A CN202311366438 A CN 202311366438A CN 117190126 A CN117190126 A CN 117190126A
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- 230000004313 glare Effects 0.000 title claims abstract description 41
- 238000009434 installation Methods 0.000 claims abstract description 4
- 238000005286 illumination Methods 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 12
- 230000003287 optical effect Effects 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 8
- 238000002834 transmittance Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 210000003128 head Anatomy 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
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Abstract
The invention relates to an ultra-low glare lighting lens, comprising: the bottom and the top of the lens are inwards concave, the bottom concave is a light inlet hole, and the top concave is a light outlet surface; the light inlet hole comprises a light inlet hole bottom incident surface and a light inlet hole side wall; the light-emitting surface comprises a lens middle light-emitting surface and a total reflection light-emitting surface; the side surface of the lens is a total reflection surface; the side wall of the light inlet hole is in a horn shape, one side close to the incident surface at the bottom of the light inlet hole is a small opening, the other side is a large opening, and one side of the large opening is the installation position of the light source. According to the ultra-low glare lighting lens, the curvature of the side wall of the light inlet hole, the curvature of the incident surface at the bottom of the light inlet hole and the curvature of the emergent surface in the middle of the lens are adjusted, so that light reflected by the side wall of the light inlet hole is totally reflected on the emergent surface in the middle of the lens, and is prevented from entering eyes from the emergent surface of the lens, glare is greatly reduced, and an anti-glare effect is realized.
Description
Technical Field
The invention relates to an optical lens and a lamp, in particular to an ultralow glare lighting lens and a lamp.
Background
In the application of the existing commercial lighting lamp, a conventional total reflection lens (hereinafter referred to as "TIR") is generally adopted as an optical scheme, and a problem often occurs mainly in that the lamp can generate uncomfortable light which is dazzling to people. When light emitted by the light source enters the lens from the side wall of the light inlet hole, a small amount of light reflected by the side wall of the light inlet hole is emitted through the two transmission surfaces in the middle of the lens, and finally enters glare caused by human eyes.
In the prior art, the middle transmission surface is shielded, but the light source can be shielded from directly entering the middle transmission surface, so that the transmittance of the lens is reduced, the light efficiency of the lamp is reduced, and the requirements of energy conservation and emission reduction are not met.
Disclosure of Invention
In view of the above, it is desirable to provide an ultra-low glare illumination lens that solves at least one of the problems described above.
An ultra-low glare illumination lens, wherein the bottom and the top of the lens are inwards recessed, the bottom recess is a light inlet hole, and the top recess is a light outlet surface;
the light inlet hole comprises a light inlet hole bottom incident surface and a light inlet hole side wall;
the light-emitting surface comprises a lens middle light-emitting surface and a total reflection light-emitting surface;
the side surface of the lens is a total reflection surface;
the side wall of the light inlet hole is in a horn shape, one side close to the incident surface at the bottom of the light inlet hole is a small opening, the other side is a large opening, and one side of the large opening is the installation position of the light source. The reflected light emitted from the intermediate emission surface of the lens is reduced, and the reflected light is generated from the side wall of the light entrance hole.
As a further aspect of the invention: the bottom incident surface of the light inlet hole protrudes towards the mounting direction of the lamp bead, and the middle emergent surface of the lens protrudes towards the light emitting direction;
the diameter of the outgoing surface in the middle of the lens is larger than that of the incoming surface at the bottom of the light incoming hole.
As a further aspect of the invention: the included angle between one end of the side wall of the light inlet hole, which is close to the incidence surface at the bottom of the light inlet hole, and the central axis of the lens is 8-10 degrees.
As a further aspect of the invention: and the normal line of the incidence surface at the bottom of the light inlet hole is nearly parallel to the light reflected by the side wall of the light inlet hole.
As a further aspect of the invention: and the included angle between the normal line of the outgoing surface in the middle of the lens and the reflected light of the side wall of the light inlet hole is larger than or equal to the critical angle of total reflection of the lens material.
As a further aspect of the invention: the upper surface of the flange edge of the lens is an inclined plane, and the inner side of the inclined plane is higher than the outer side of the inclined plane.
The invention also provides a lamp, which comprises the ultra-low glare lens.
According to the ultra-low glare lighting lens, the curvature of the side wall of the light inlet hole, the curvature of the incident surface at the bottom of the light inlet hole and the curvature of the emergent surface in the middle of the lens are adjusted, so that light reflected by the side wall of the light inlet hole is totally reflected on the emergent surface in the middle of the lens, and is prevented from entering eyes from the emergent surface of the lens, glare is greatly reduced, and an anti-glare effect is realized.
Drawings
FIG. 1 is a light path diagram of a first embodiment of the present invention;
FIG. 2 is a schematic diagram of calculation formula parameters according to a first embodiment of the present invention;
FIG. 3 is a graph showing the light extraction efficiency according to the first embodiment of the present invention;
FIG. 4 is a table of glare values for the first embodiment of the present invention;
FIG. 5 is an optical path diagram of comparative example one of the present invention;
FIG. 6 is a graph showing the light extraction efficiency of comparative example one of the present invention;
FIG. 7 is a table of glare values for comparative example one of the present invention;
FIG. 8 is a light path diagram of comparative example II of the present invention;
FIG. 9 is a graph showing the light extraction efficiency of comparative example II of the present invention;
FIG. 10 is a table of glare values for comparative example two of the present invention;
FIG. 11 is a light path diagram of the present invention prior to flange modification;
FIG. 12 is an optical path diagram of the flange of the present invention after modification.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more; the terms "center," "longitudinal," "transverse," "upper," "lower," "left," "right," "inner," "outer," "front," "rear," "head," "tail," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used as references to orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and are not to be construed as limiting the invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
An ultra-low glare illumination lens comprising: the bottom and the top of the lens are inwards concave, the bottom concave is a light inlet hole, and the top concave is a light outlet surface;
the light inlet hole comprises a light inlet hole bottom incident surface and a light inlet hole side wall;
the light-emitting surface comprises a lens middle light-emitting surface and a total reflection light-emitting surface;
the side surface of the lens is a total reflection surface;
the side wall of the light inlet hole is in a horn shape, one side close to the incident surface at the bottom of the light inlet hole is a small opening, the other side is a large opening, and one side of the large opening is the installation position of the light source.
Furthermore, the incidence surface at the bottom of the light inlet hole is raised towards the mounting direction of the lamp beads, and the middle outgoing surface of the lens is raised along the light emitting direction;
the diameter of the outgoing surface in the middle of the lens is larger than that of the incoming surface at the bottom of the light incoming hole.
As shown in fig. 2, light emitted by the light source is reflected by a small amount of light passing through the side wall of the light inlet hole, enters the inside of the lens through the incident surface at the bottom of the light inlet hole, the incident surface at the bottom of the light inlet hole is perpendicular to the reflected light, and the reflected light is totally reflected on the emergent surface in the middle of the lens, so that the reflected light is prevented from entering human eyes from the emergent surface of the lens, glare is greatly reduced, an anti-dazzle effect is realized, and the calculation meets the following formula:
the total reflection of the reflected light rays on the outgoing surface in the middle of the lens is required to meet the requirement that the incident angle alpha is more than or equal to arcsin (1/n); the included angle beta=arctan (H/L) between the light emitted by the light source and the horizontal direction; the slope of the top of the sidewall of the light entrance aperture is equal to θ= [ β - (90- α) ]/2; the slope theta of the top of the side wall of the light inlet hole is more than or equal to { arctan (H/L) - [90-arcsin (1/n) ] }/2; the refractive index of the lens material is n, the longitudinal distance from the top of the light inlet hole to the light source is H, and the transverse distance is L.
Furthermore, the included angle between one end of the side wall of the light inlet hole, which is close to the incident surface at the bottom of the light inlet hole, and the central axis of the lens is 8-10 degrees. The included angle between one end of the side wall of the light inlet hole, which is close to the opening position of the bottom of the lens, and the central axis of the lens is the largest, namely the included angle gradually increases from inside to outside, and the side wall of the light inlet hole is in a horn shape. As shown in fig. 1, the structure can change the optical path of the reflected light and reduce the reflected light entering the incident surface at the bottom of the light entrance hole compared with the conventional structure.
Further, the normal of the incident surface at the bottom of the light inlet is approximately parallel to the light reflected by the side wall of the light inlet. The center of the incidence surface at the bottom of the light hole is the position with the largest curvature radius, and the edge is the position with the smallest curvature radius.
Furthermore, the included angle between the normal line of the outgoing surface in the middle of the lens and the reflected light of the side wall of the light inlet hole is larger than or equal to the critical angle of total reflection of the lens material. The center of the outgoing surface in the middle of the lens is the position with the largest curvature radius, and the edge is the position with the smallest curvature radius.
By adjusting the curvature of the side wall of the light inlet hole, the included angle between the slope of the side wall and the central optical axis of the lens reaches about 8-10 degrees (the conventional lens is about 3-5 degrees), so that the included angle between the direction of the side wall reflecting a small amount of light and the central optical axis of the lens is larger.
By adjusting the curvature of the incidence surface at the bottom of the light inlet hole, the normal of the incidence surface at the bottom of the light inlet hole is approximately parallel to the light reflected by the side wall of the light inlet hole, so that the included angle between a small amount of light reflected by the side wall and the central optical axis of the lens can not be reduced.
By adjusting the curvature of the outgoing surface in the middle of the lens, the included angle between the light reflected by the side wall of the light inlet hole and the normal line of the outgoing surface in the middle of the lens reaches the critical angle of the lens material as much as possible, so that a small amount of light reflected by the side wall is totally reflected on the outgoing surface in the middle of the lens.
The three curved surfaces are combined, so that the light reflected by the side wall of the light inlet hole can not finally enter human eyes from the outgoing surface in the middle of the lens, and glare can not be generated.
Light rays entering from the incidence surface at the bottom of the light entrance hole pass through the inside of the lens and are emitted from the middle outgoing surface of the lens; the light rays entering from the side wall of the light entrance hole pass through the inside of the lens, and part of the light rays are reflected by the total reflection surface and are emitted from the total reflection light emitting surface; a part of the reflected light generated on the side wall of the light inlet hole enters the lens from the incidence surface at the bottom of the light inlet hole, passes through the inside of the lens, is emitted from the total reflection surface through the total reflection of the middle emission surface of the lens, and the other part of the reflected light directly enters the lens from the side wall of the light inlet hole and is emitted from the total reflection surface 。
Furthermore, the upper surface of the flange of the lens is an inclined plane, the inner side of the inclined plane is higher than the outer side of the inclined plane, so as to eliminate glare escaping from the flange, as shown in fig. 11, the upper, side and lower three sides of the conventional flange are all planes, the light path is shown in the figure, a small amount of light emitted by the light source can be totally reflected by the three sides, and then is emitted from the totally reflected light-emitting surface, and finally is emitted into eyes to cause glare. As shown in fig. 12, by improving the upper surface of the flange edge from a plane to an inclined plane, the light rays generating the glare can be directly emitted obliquely from the inclined plane, so that the glare generated at the flange edge is reduced.
Example 1
Referring to fig. 1-4, a part of light emitted by the light source is refracted through the incident surface at the bottom of the light inlet hole and enters the inside of the lens (indicated by green arrow lines in the figure), and then is emitted from the lens through the emergent surface in the middle of the lens, so that the part of light cannot enter human eyes to generate glare; the other part of light rays pass through the side wall of the light inlet hole, are refracted and enter the lens (represented by red arrow lines in the figure), are reflected by the total reflection surface and finally exit from the total reflection light exit surface, and the part of light rays cannot enter people to generate glare; the light is refracted at the side wall of the light inlet hole and reflected to generate a small amount of reflected light (indicated by blue arrow lines in the figure), and the small amount of reflected light is totally reflected at the outgoing surface in the middle of the lens and cannot enter human eyes from the outgoing surface in the middle of the lens, so that glare is avoided, and the transmittance of the lens is hardly affected.
PMMA is uniformly adopted as the lens material, the light-emitting angle through the lens is basically consistent, and under the premise that the input luminous flux of the light source is consistent, the graph can be obtained:
the transmittance of the deep antiglare lens is 89.5%, and the UGR value is 4.4 at the maximum.
UGR value less than 10 is no glare, and the deep antiglare lens can meet UGR value less than 10 and ensure high transmittance.
The glare value UGR generally refers to a psychological parameter for measuring subjective reactions of discomfort caused to human eyes by light emitted from a lighting device in an indoor visual environment, and the magnitude of the psychological parameter can be calculated according to a specified calculation condition by using a CIE unified glare value formula. The formula is: ugr=8 lg (0.25/Lb) Σ ((La 2 ω)/(P2)). From this formula, the UGR value can be calculated. It is also common in optical design to use optical software (LightTools) simulations or using breadth-meter testing. The data in fig. 3-4 and described above were simulated using optical software.
Comparative example one
Referring to fig. 5-7, the tir lens structure is in a middle shielding light-emitting mode, a part of light rays emitted by the light source passes through the bottom incident surface of the light-entering hole and is refracted into the lens (indicated by a green arrow line in a schematic diagram), and shielding is performed on the middle emergent surface of the lens, so that the part of light rays are absorbed and cannot be utilized to cause waste; the other part of light rays pass through the side wall of the light inlet hole, are refracted and enter the lens (represented by red arrow lines in the schematic diagram), are reflected by the total reflection surface and finally exit from the total reflection light exit surface, and the part of light rays cannot be emitted into people to generate glare; light is refracted at the side wall of the light inlet hole and reflected, a small amount of reflected light (represented by blue arrow lines in the schematic diagram) is generated, and the small amount of reflected light enters the lens from the emitting surface at the bottom of the light inlet hole, and because the emitting surface in the middle of the lens is shielded, the light cannot enter human eyes to cause glare. However, the light-emitting mode of the shielding absorbs part of light, so that the transmittance of the lens can be reduced by at least more than 30%.
Comparative example two
Referring to fig. 8-10, the tir lens structure is a conventional light-emitting mode, a part of light emitted by the light source is refracted through the incident surface at the bottom of the light-entering hole, enters the inside of the lens (indicated by green arrow lines in the schematic diagram), and exits from the lens through the exit surface in the middle of the lens, and the part of light cannot enter human eyes to generate glare; the other part of light rays pass through the side wall of the light inlet hole, are refracted and enter the lens (represented by red arrow lines in the schematic diagram), are reflected by the total reflection surface and finally exit from the total reflection light exit surface, and the part of light rays cannot enter people to generate glare; the light is refracted at the side wall of the light inlet hole and reflected to generate a small amount of reflected light (represented by blue arrow lines in the schematic diagram), and the small amount of reflected light enters the lens from the incidence surface at the bottom of the light inlet hole, then exits from the lens through the outgoing surface in the middle of the lens, finally enters human eyes, which is the main reason for generating glare.
The lens structure is not limited to a specific angle or aperture diameter, and the requirement can be that the angle and aperture diameter can be different by changing the radian of the optical curved surface of each part. The same, the whole structure can also be along with the size of the luminous surface of the LED light source, and the whole lens is made to be large or small so as to meet the effects of different LED light sources.
The invention also provides a lamp, which comprises the ultra-low glare lighting lens.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present invention.
Claims (7)
1. An ultra-low glare illumination lens comprising: the bottom and the top of the lens are inwards concave, the bottom concave is a light inlet hole, and the top concave is a light outlet surface;
the light inlet hole comprises a light inlet hole bottom incident surface and a light inlet hole side wall;
the light-emitting surface comprises a lens middle light-emitting surface and a total reflection light-emitting surface;
the side surface of the lens is a total reflection surface;
the method is characterized in that: the side wall of the light inlet hole is in a horn shape, one side close to the incident surface at the bottom of the light inlet hole is a small opening, the other side is a large opening, and one side of the large opening is the installation position of the light source.
2. The ultra-low glare illumination lens of claim 1, wherein: the bottom incident surface of the light inlet hole protrudes towards the mounting direction of the lamp bead, and the middle emergent surface of the lens protrudes towards the light emitting direction;
the diameter of the outgoing surface in the middle of the lens is larger than that of the incoming surface at the bottom of the light incoming hole.
3. The ultra-low glare illumination lens of claim 1, wherein: the included angle between one end of the side wall of the light inlet hole, which is close to the incidence surface at the bottom of the light inlet hole, and the central axis of the lens is 8-10 degrees.
4. The ultra-low glare illumination lens of claim 1, wherein: and the normal line of the incidence surface at the bottom of the light inlet hole is nearly parallel to the light reflected by the side wall of the light inlet hole.
5. The ultra-low glare illumination lens of claim 1, wherein: and the included angle between the normal line of the outgoing surface in the middle of the lens and the reflected light of the side wall of the light inlet hole is larger than or equal to the critical angle of total reflection of the lens material.
6. The ultra-low glare illumination lens of claim 1, wherein: the upper surface of the flange edge of the lens is an inclined plane, and the inner side of the inclined plane is higher than the outer side of the inclined plane.
7. A lamp, characterized in that: an ultra-low glare illumination lens comprising any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311366438.7A CN117190126A (en) | 2023-10-20 | 2023-10-20 | Ultra-low glare lighting lens and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311366438.7A CN117190126A (en) | 2023-10-20 | 2023-10-20 | Ultra-low glare lighting lens and lamp |
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| Publication Number | Publication Date |
|---|---|
| CN117190126A true CN117190126A (en) | 2023-12-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311366438.7A Pending CN117190126A (en) | 2023-10-20 | 2023-10-20 | Ultra-low glare lighting lens and lamp |
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| Country | Link |
|---|---|
| CN (1) | CN117190126A (en) |
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- 2023-10-20 CN CN202311366438.7A patent/CN117190126A/en active Pending
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