CN102563521B - Flood lens - Google Patents
Flood lens Download PDFInfo
- Publication number
- CN102563521B CN102563521B CN201010620720.XA CN201010620720A CN102563521B CN 102563521 B CN102563521 B CN 102563521B CN 201010620720 A CN201010620720 A CN 201010620720A CN 102563521 B CN102563521 B CN 102563521B
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- Prior art keywords
- lens
- concave spherical
- spherical surface
- flood
- light source
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Abstract
The invention relates to a flood lens for light distribution of an LED light source. The flood lens is characterized in that the lens is a rotary body; the bottom surface of the lens is provided with a first concave spherical surface; the spherical center of the first concave spherical surface is positioned on the axis of the lens; the top surface of the lens is provided with a second concave spherical surface; the spherical center of the second concave spherical surface is positioned on the axis of the lens; and the side surface of the lens is a total-reflection surface. The invention has the advantages that the bottom surface of the lens is provided with the first concave spherical surface, and the top surface of the lens is provided with a second concave spherical surface; after the lights with small light-emitting angles of the LED light source are refracted by the first concave spherical surface, then the light-emitting angles are amplified for the first time; after the lights with the small light-emitting angles of the LED light source are refracted by the second concave spherical surface, then the light-emitting angles are amplified for the second time; and by twice amplification, stronger optical fibers of the part near the axis are dispersed around, so that the problem of larger light intensity of the part near the axis of the LED light source is solved, and the more-uniform flood light distribution can be realized.
Description
Technical field
The present invention relates to the light-distribution lens for LED light source, more particularly, relate to a kind of flood lens for LED light source luminous intensity distribution.
Background technology
While adopting LED light source to carry out floodlighting, the general reflector that adopts carries out luminous intensity distribution to LED light source, but the light distribution effect of this mode is not very desirable, this be because, the beam intensity ratio of the axial ray part of LED light source is larger, but this part light can not pass through reflector luminous intensity distribution, and the floodlight that therefore reflector is allotted, always there will be the light intensity of mid portion higher.
In order to obtain floodlight luminous intensity distribution comparatively uniformly, also there are the concavees lens of employing to carry out luminous intensity distribution to LED light source, but the utilization rate of the luminous flux of this mode to LED light source is lower, show that the larger light of light emitting anger of LED light source cannot be utilized, finally cause the light efficiency utilization rate of light fixture too low.
In addition, also has a class flood lens, to improve on the basis of the optically focused total reflection lens of LED light source, as shown in Figure 1, make densely covered netted small salient point or bowl configurations and realize the effect of floodlight at the exit facet 1 of lens, also have and adopt exit facet frosted processing, the floodlight effect that these processing modes reach is all even not, floodlight angle is generally less, and due to the exit facet of frosting or class frosted, makes light loss.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of the flood lens of prior art, provides the flood lens that a kind of light distribution effect is good, light loss is little.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of flood lens, for the luminous intensity distribution of LED light source, described lens are revolving body, the bottom surface of described lens is provided with the first concave spherical surface, the centre of sphere of described the first concave spherical surface is positioned on the axis of described lens, the end face of described lens is provided with the second concave spherical surface, and the centre of sphere of described the second concave spherical surface is positioned on the axis of described lens, and the side of described lens is fully reflecting surface.
In flood lens of the present invention, described the first concave spherical surface is hemispheric concave spherical surface.
In flood lens of the present invention, the radius of described the first concave spherical surface is 2.5mm～3mm.
In flood lens of the present invention, the radius of described the second concave spherical surface is 18mm～25mm.
In flood lens of the present invention, the summit of described the second concave spherical surface to the distance of the bottom surface of described lens for being less than 10mm.
In flood lens of the present invention, described revolving body is frustum, the less plane of area in two planes that described bottom surface is frustum.
In flood lens of the present invention, described lens are by transparent material injection mo(u)lding.
In flood lens of the present invention, described transparent material is Merlon or polymethyl methacrylate.
In flood lens of the present invention, the refractive index of described transparent material is 1.45～1.65.
In flood lens of the present invention, the cone angle of described frustum is 72～78 degree.
Implement flood lens of the present invention, there is following beneficial effect: the bottom surface of lens of the present invention is provided with the first concave spherical surface, end face is established the second concave spherical surface, the less light of the light emitting anger of LED light source is after the first concave spherical surface refraction, light emitting anger is amplified for the first time, after the second concave spherical surface refraction of end face, light emitting anger is amplified for the second time, amplify through secondary, spreading to surrounding compared with high light fibre of axial ray part, the larger problem of light intensity that has solved the axial ray part of LED light source, can realize more uniform floodlight luminous intensity distribution.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the schematic diagram of existing flood lens;
Fig. 2 is the schematic diagram of the preferred embodiment of flood lens of the present invention;
Fig. 3 is the front view of the preferred embodiment of flood lens of the present invention;
Fig. 4 is A-A profile in Fig. 3;
Fig. 5 is the luminous intensity distribution schematic diagram of the preferred embodiment of flood lens of the present invention;
Fig. 6 is the light distribution effect figure of the preferred embodiment of flood lens of the present invention.
Detailed description of the invention
Floodlight total-reflection lens of the present invention is for the luminous intensity distribution of LED light source, these lens are revolving body, preferably taper type, the bottom surface of lens is provided with the first concave spherical surface, the centre of sphere of the first concave spherical surface is positioned on the axis of lens, and the end face of lens is provided with the second concave spherical surface, and the centre of sphere of the second concave spherical surface is positioned on the axis of lens, the side of lens is fully reflecting surface, and the radius of the second concave spherical surface is larger.Like this, the less light of the light emitting anger of LED light source is after the first concave spherical surface refraction, light emitting anger is amplified for the first time, after the second concave spherical surface refraction of end face, light emitting anger is amplified for the second time, amplifies the spreading to surrounding compared with high light fibre of axial ray part through secondary, the larger problem of light intensity that has solved the axial ray part of LED light source, can realize more uniform floodlight luminous intensity distribution.
In floodlight total-reflection lens of the present invention, the first concave spherical surface is hemispheric concave spherical surface, the centre of sphere of the first concave spherical surface is positioned on the bottom surface of lens, the radius of the first concave spherical surface is 2.5mm～3mm, the radius of the second concave spherical surface is larger, for 18mm～25mm, the degree of depth of the second concave spherical surface is more shallow, is also that the angle of the right drift angle of the second concave spherical surface is less.The summit of the second concave spherical surface (also i.e. the intersection point of the second concave spherical surface and axis) to the distance of the bottom surface of lens for being less than 10mm.The lens of mid portion, especially the first concave spherical surface and the second concave spherical surface, Main Function is that the smaller light of LED light emitting anger is played to diffusion.The cone angle of taper type is 72～78 degree, ensures that the larger light of lighting angle of LED light source is also that total reflection occurs on the conical surface in the side of lens.
Understand for technical characterictic of the present invention, object and effect being had more clearly, now contrast accompanying drawing and describe the specific embodiment of the present invention in detail.
As shown in Figures 2 to 4, for a preferred embodiment of flood lens of the present invention, in the present embodiment, lens 100 are revolving body, this revolving body is frustum in the present embodiment, the cone angle of frustum is 72～78 degree, in two planes of frustum, the less plane of area is the bottom surface 101 of lens 100, the plane that area is larger is the end face 102 of lens 100, the conical surface of frustum is the side 103 of lens 100, this side 103 is fully reflecting surface, and the light that LED light source sends, on this side 103, total reflection occurs, and then goes out to be shot out through end face.
In the present embodiment, the bottom surface 101 of lens 100 is provided with the first concave spherical surface 110, the centre of sphere of the first concave spherical surface 110 is positioned on the axis of lens 100, concave spherical surface 110 is hemispheric concave spherical surface in the present embodiment, also be that its centre of sphere is positioned on the bottom surface of lens 100, in order to make the size of lens smaller, the radius r of the first concave spherical surface is as far as possible little, radius r is at 2.5mm～3mm, and LED light source is selected the smaller LED chip of diameter as far as possible.The end face 102 of lens 100 is provided with the second concave spherical surface 120, second concave spherical surface 120 centre ofs sphere are positioned on the axis of lens 100, and the radius of the second concave spherical surface 120 is larger, are 18mm～25mm, the degree of depth of the second concave spherical surface 120 is more shallow, is also that the angle of the right drift angle of the second concave spherical surface 120 is less.The summit of the second concave spherical surface 120 (also i.e. the intersection point of the second concave spherical surface 120 and axis) to the distance of the bottom surface 101 of lens 100 for being less than 10mm.
In the present embodiment, lens are by transparent material injection mo(u)lding, and the material of lens is Merlon, i.e. PC, and its refractive index n is 1.59, the design parameter of these lens is as following table:
| The radius r (mm) of the first concave spherical surface | 3.0 |
| The angle a (degree) (semi-cone angle) of lens side bus and optical axis | 37 |
| The radius R (mm) of the second concave spherical surface | 20 |
| The summit of the second concave spherical surface is to the distance L (mm) of lens bottom surface | 9.1 |
| The diameter (mm) of lens bottom | 7 |
| The diameter (mm) of lens front end | 22 |
| The height h (mm) of lens | 10 |
The schematic diagram that Fig. 5 floodlight total-reflection lens of the present invention coordinates with LED light source, the light-emitting area of LED light source 200 overlaps with the bottom surface of lens 100, and the diameter that LED light source 200 enters the part of the first concave spherical surface 110 is less than 3mm.Have figure to find out, the side 103 of the light that in the luminous light of LED light source 200, lighting angle is larger directive lens 100 after the first concave spherical surface 110 refractions is penetrated by the end face 102 of lens 100 after 103 total reflections of side; In the luminous light of LED light source 200, the less light of lighting angle is penetrated after the first concave spherical surface 110 refractions, light emitting anger is amplified for the first time, after the second concave spherical surface 120 refractions of end face 102, light emitting anger is amplified for the second time, amplify through secondary, after refraction, the light emitting anger of light becomes large, the spreading to surrounding compared with high light fibre of axial ray part.Like this, after these lens 100, light is penetrated by the end face 102 of lens 100 comparatively uniformly, obtains more uniform lighting effect.
Fig. 6 shows the light distribution effect figure of the lens of the present embodiment, can clearly be found out by figure, and in the scope of light emitting anger approximately 30 degree, light distribution is very even.
It will be appreciated that, the parameter of floodlight total-reflection lens of the present invention is not limited to the parameter of above-described embodiment.Floodlight total-reflection lens of the present invention can be by other transparent material injection mo(u)ldings, for example polymethyl methacrylate, i.e. and PMMA, or other transparent materials, refractive index is between 1.45～1.65.
By reference to the accompanying drawings embodiments of the invention are described above; but the present invention is not limited to above-mentioned detailed description of the invention; above-mentioned detailed description of the invention is only schematic; instead of restrictive; those of ordinary skill in the art is under enlightenment of the present invention; not departing from the scope situation that aim of the present invention and claim protect, also can make a lot of forms, within these all belong to protection of the present invention.
Claims (2)
1. a flood lens, for the luminous intensity distribution of LED light source, it is characterized in that, described lens are revolving body, the bottom surface of described lens is provided with the first concave spherical surface, and the centre of sphere of described the first concave spherical surface is positioned on the axis of described lens, and the end face of described lens is provided with the second concave spherical surface, the centre of sphere of described the second concave spherical surface is positioned on the axis of described lens, and the side of described lens is fully reflecting surface; Described the first concave spherical surface is hemispheric concave spherical surface; The radius of described the first concave spherical surface is 2.5mm～3mm; The radius of described the second concave spherical surface is 18mm～25mm; The summit of described the second concave spherical surface to the distance of the bottom surface of described lens for being less than 10mm; Described revolving body is frustum, the less plane of area in two planes that described bottom surface is frustum; The cone angle of described frustum is 72～78 degree;
Described lens are by transparent material injection mo(u)lding; The refractive index of described transparent material is 1.45～1.65.
2. flood lens according to claim 1, is characterized in that, described transparent material is Merlon or polymethyl methacrylate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010620720.XA CN102563521B (en) | 2010-12-31 | 2010-12-31 | Flood lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010620720.XA CN102563521B (en) | 2010-12-31 | 2010-12-31 | Flood lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102563521A CN102563521A (en) | 2012-07-11 |
| CN102563521B true CN102563521B (en) | 2014-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010620720.XA Expired - Fee Related CN102563521B (en) | 2010-12-31 | 2010-12-31 | Flood lens |
Country Status (1)
| Country | Link |
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| CN (1) | CN102563521B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105180117A (en) * | 2015-08-28 | 2015-12-23 | 中山市绿涛电子科技有限公司 | Radiator for LED lamp |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101556021A (en) * | 2009-01-16 | 2009-10-14 | 深圳市深华龙科技实业有限公司 | LED street lamp lens device |
| CN101598292A (en) * | 2008-06-06 | 2009-12-09 | 鸿富锦精密工业（深圳）有限公司 | LED light source module |
| CN101749643A (en) * | 2009-12-25 | 2010-06-23 | 深圳市邦贝尔电子有限公司 | Light emitting diode (LED) lens and LED lens group |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5115038B2 (en) * | 2007-06-06 | 2013-01-09 | ソニー株式会社 | Light emitting device, surface light source device, and image display device |
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2010
- 2010-12-31 CN CN201010620720.XA patent/CN102563521B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101598292A (en) * | 2008-06-06 | 2009-12-09 | 鸿富锦精密工业（深圳）有限公司 | LED light source module |
| CN101556021A (en) * | 2009-01-16 | 2009-10-14 | 深圳市深华龙科技实业有限公司 | LED street lamp lens device |
| CN101749643A (en) * | 2009-12-25 | 2010-06-23 | 深圳市邦贝尔电子有限公司 | Light emitting diode (LED) lens and LED lens group |
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| Publication number | Publication date |
|---|---|
| CN102563521A (en) | 2012-07-11 |
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Granted publication date: 20140827 Termination date: 20181231 |
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