CN103994396B - A kind of bis- refraction-reflection lens of LED for downward back radiant - Google Patents
A kind of bis- refraction-reflection lens of LED for downward back radiant Download PDFInfo
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- CN103994396B CN103994396B CN201410202369.0A CN201410202369A CN103994396B CN 103994396 B CN103994396 B CN 103994396B CN 201410202369 A CN201410202369 A CN 201410202369A CN 103994396 B CN103994396 B CN 103994396B
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Abstract
The invention discloses a kind of bis- refraction-reflection lens of LED for downward back radiant, bis- refraction-reflection lens of the LED are the axial symmetry entity being made of transparent material, it is characterized in that bis- refraction-reflection lens of LED are by incident plane of refraction, central reflective face, side exit facet, bottom reflection face constitutes, the incident plane of refraction, central reflective face, side exit facet, bottom reflection face is curved surface, the incident plane of refraction is located at bis- refraction-reflection lens bottoms of LED, the central reflective face is connected to become upper surface with side exit facet, central reflective face is located at incident plane of refraction top, the side exit facet is the curved surface in a connection bottom reflecting surface and central reflective face.Curved surface of the present invention can be characterized by quadratic polynomial.The present invention is simple for structure, while realizing large angle illumination and not increasing LED particle quantity, reduces diffusion length and non-dispersive phenomenon.The present invention installs configuration simply, and the effectively save energy.
Description
Technical field
The present invention relates to a kind of bis- refraction-reflection lens of LED for downward back radiant, under being primarily adapted for use in directly
The backlight of formula back light, LED-backlit billboard etc..
Background technology
Back light is in conventional liquid crystal（LCD）And have substantial amounts of application in large-scale advertisement plate.And it is traditional cold
Cathode tube（CCFL）Backlight is gradually by light emitting diode（LED）Backlight is replaced.And initial backlight is using the back of the body
The light guide plate realization of face carving treatment, its light source（The CCFL of the line source or LED of spot light）Imported light into from light guide plate side,
This kind of mode is due to the limitation of guide-lighting plate technique, and light efficiency is not high.And directly-down liquid crystal display backlight source then effectively improves
Light efficiency problem.LED belongs to the spot light of limited angle light beam, and direct LED backlight needs hundreds of or even thousands of white
Color or three-primary color LED are arranged and form area source, are formed a large-area planar and are illuminated, thus required LED particle is excessive
Cause high cost.
Spot light is changed into area source, is the key technology of LED backlight.The light source uniformity and mixed light height are backlights
The very important performance indications in two, source.
It is the key factor for restricting LED direct-light-type backlights for the improvement of optical uniformity.LED is based in LED backlight
The area source of array, distribution is closely relevant by force with LED light for the uniformity.When lens are fitted without, LED light is distributed by force close to lambert
Spy's distribution.When the light distribution of LED by the use of traditional dome-type lens as LED backlight, can be changed, beam angle is reduced,
So that light is more concentrated near LED axis.No matter using any LED packaged types, the back of the body of directly-down type LCD is used it for
During light source, all can excessively be concentrated due to light distribution and so that light is concentrated near axis so that backlight is difficult to obtain
High evenness.Therefore backlight of the optical uniformity as directly-down type LCD is difficult to the problem for solving the most.When LED direct-type backlights
When source uses conventional LED package form, to improve the light uniformity, generally using increase thickness（Increase mixed light height）, or
Increase LED arrangement density.This kind of solution increased the volume and weight of backlight, so as to restrict LCD direct-light-type backlights
Popularization and development.How mixed light height is reduced as one key index of backlight.It is widely used in the market
It is a kind of circular secondary lens.The program by LED light line by two circular concaves, by refractive Iy, by the LED light angle of divergence
Degree increase, by array arrangement, realization reduces the backlight solution of mixed light height with less LED particle array arrangement.
It is more and more lower however as mixed light height（That is thickness requirement more and more thinner）, every lens must reach bigger refraction angle.
But this dispersion factor of scheme lens due to lens material in itself, at excessive refraction angle, the refraction angle of different wave length is poor
It is different also bigger, thus result in rainbow phenomena, that is, produce color spot to influence the white chromaticity of light source so that this backlight solution
The requirement that mixed light height is further reduced while LED particle quantity is not increased cannot be met.
The content of the invention
The technical problems to be solved by the invention are to overcome the above-mentioned deficiency in the presence of prior art, i.e. large angle illumination
When the rainbow dispersion phenomenon that exists limit mixed light height reduced under the premise of LED particle quantity is not increased, and provide a kind of new
The bis- refraction-reflection lens of LED for downward back radiant, on the one hand can effectively improve by the light source light uniformity, and
While LED particle number is not increased, mixed light height is further reduced, technique effect is good and low cost.
The present invention solves the technical scheme that is used of above-mentioned technical problem：A kind of LED for downward back radiant
Secondary refraction-reflection lens, bis- refraction-reflection lens of the LED are the axial symmetry entity being made of transparent material, its feature
It is that bis- refraction-reflection lens of the LED are made up of incident plane of refraction, central reflective face, side exit facet, bottom reflection face, it is described
Incident plane of refraction, central reflective face, side exit facet, bottom reflection face are curved surface, and the incident plane of refraction is located at LED bis- times thoroughly
Mirror bottom, the central reflective face is located at plane of incidence top, and the side exit facet is connection bottom reflecting surface and a central reflective
The curved surface in face.
Central reflective face of the present invention, side exit facet are smooth surface.
Bottom reflection face of the present invention is smooth surface.
Incident plane of refraction of the present invention is a smooth surface.The need for according to final effect, may be designed as convex surface or
Concave surface, is also designed to Fresnel Lenses face.
Incident plane of refraction of the present invention, central reflective face, side exit facet, bottom reflection face are smooth surface, incident
Plane of refraction, central reflective face, side exit facet, the contour line in bottom reflection face can be characterized by following multinomial：
Wherein z is the height of contour line, and r is distance of the contour line relative to axis,c,k,A 1,A 2,A 3,A 4... it is root
According to the parameter that design object can be optimized.
The height z and contour line of contour line of the present invention are apart from r relative to axis can be according to design object
The parameter for optimizing.
The target area of illumination of the invention can be divided into wide-angle and shine according to the radial distance apart from LED center illumination region
Area pellucida domain（Distance center illumination region is farthest, is also easy to produce rainbow phenomena）, low-angle illumination region（Distance center illumination region is not
Too far, because refraction angle is relatively small, rainbow phenomena is not obvious）And frontlighting region（Just go up in central illumination region
Side）, the incident plane of refraction, central reflective face, side exit facet, the above-mentioned parameter design in bottom reflection face meet（Follow）Big angle
Degree illumination region, low-angle illumination region, the brightness of illumination homogenization in frontlighting region.
Four major optical faces of the invention are respectively used to produce the illumination of different angles, and large angle illumination is mainly by center
Reflecting surface is produced with total reflection mode；Low-angle illumination is mainly formed by the refraction of side exit facet, and frontlighting is then mainly by saturating
The internal reflection of mirror and be assemblied in LED light source bottom reflector plate realize；And incident plane of refraction, central reflective face, side exit facet,
Bottom reflection face is then optimized by multinomial as above realizes that what each several part illuminated evenly distributes to realize final all regions
The purpose of Uniform Illumination.Due to wide-angle（Diffusion part）Illumination is made up of total reflection mode, so the embodiment of the present invention possesses
Preferable dispersion characteristics, will not form dispersion aperture because angle is big.
The present invention is simple for structure, is realizing high diffusivity ratio（Angle spread）Under the conditions of low mixed light height, product light is equal
Evenness is high, and assembling is simple, energy saving.
Brief description of the drawings
Fig. 1 is the round lens diffusion light beam schematic diagram of prior art.
Fig. 2 is the cross-sectional view of the embodiment of the present invention.
Fig. 3 is embodiment of the present invention part LED light line by the total reflection form in central reflective face from side outgoing surface launching
Go out and produce large angle illumination view.
Fig. 4 is that embodiment of the present invention part LED light line is directed through side exit facet and producing ratio Fig. 3 by incident plane of refraction
The slightly smaller low-angle illumination condition schematic diagram of shown state angle, this part LED light line is realized by refraction.
Fig. 5 is that embodiment of the present invention part LED light line passes through incident plane of refraction in lens inner total reflection or by LED light source
Under reflector plate reflection, and part LED light line is directed through incident plane of refraction, central reflective face region, eventually forms front
Illumination condition schematic diagram, now light is realized by the mode of refraction reflection mixing.
Fig. 6 is embodiment of the present invention beam angle distribution schematic diagram vertically.
Fig. 7 is available to auditor's prior art referred application schematic diagram, it is shown that one is realized using prior art
Round lens transmitted light colorimetric analysis schematic diagram, it has obvious rainbow line phenomenon.
Fig. 8 is available to the present embodiment application schematic diagram of auditor's reference, it is shown that the transmission photochromism of the present embodiment
Analysis schematic diagram, it is without rainbow line phenomenon.
Specific embodiment
To become apparent from the object, technical solutions and advantages of the present invention, below in conjunction with specific implementation case and with reference to attached
Figure, is described in further details to the present invention.
Fig. 2 illustrates bis- basic structures of refraction-reflection lens of LED described in the embodiment of the present invention, is to use transparent material
The axial symmetry entity being made, bis- refraction-reflection lens of this LED include incident plane of refraction 1, central reflective face 2, the and of side exit facet 3
Bottom reflection face 4, the incident plane of refraction 1 is located at the top of LED light source 5 and bis- refraction-reflection lens bottoms of LED and is curved surface,
The central reflective face 2 is located at the incident top of plane of refraction 1 and is curved surface, and the side exit facet 3 is a connection bottom reflection face 4
With the curved surface in central reflective face 2, bottom reflection face 4 and side exit facet 3 are curved surface.
Incident plane of refraction 1 of the present invention, central reflective face 2, side exit facet 3, bottom reflection face 4 are smooth surface,
Incident plane of refraction 1, central reflective face 2, side exit facet 3, the contour line in bottom reflection face 4 can be characterized by following multinomial：
Wherein z is the height of contour line（Relative to the height of incident plane of refraction 1, the extreme lower position of bottom reflection face 4 shown in Fig. 2
Degree）, r is distance of the contour line relative to axis 7,c,k,A 1,A 2,A 3,A 4... can be optimized according to design object
Parameter.
Fig. 3 shows some light view for producing large angle illumination, and the light from LED light source 5 is by entering
After penetrating the diffusion of plane of refraction 1, some light can form total reflection condition on central reflective face 2, and be reflected by central reflective face 2
To side exit facet 3, then the output light via side exit facet 3, this part emergent ray is wide-angle, mainly via central reflective
The total reflection in face 2 is formed, and is that reflection angle does not change because of wavelength the characteristics of reflection, thus this part large angle illumination light
Big angle of flare by total reflection formed, dispersion characteristics can be effectively controlled；It should be noted that the reflection of central reflective face 2
Some light also can send to form large angle illumination by side exit facet 3 again by the reflection in bottom reflection face 4.As described above
Large angle illumination will all be used for illuminating those regions apart from the radial distance of LED light source 5 farther out.
Fig. 4 shows some light view produced compared with little refraction angle illumination.A part of light is by LED light source
5 via side exit facet 3 by after the diffusion of incident plane of refraction 1, directly forming divergent rays, and the angle of this some light is not so good as Fig. 3
The part light angle of middle signal is big, although this partial illumination light is by two faces（Incident plane of refraction 1 and side exit facet
3）Refraction is formed, and due to refraction angle less, therefore the dispersion characteristics of this partial illumination can be effectively controlled.This part
It is not far region that illuminating ray is mainly used to illuminate those apart from the radial distance of LED light source 5.
Fig. 5 shows some light view for producing frontlighting, partly by the total reflection light in central reflective face 2
Line is in lens interior in other smooth surfaces（Such as side exiting surface 3, bottom reflection face 4）The situation of multiple total reflection is formed, there is one
Some light is finally reflected away with smaller angle by bottom reflection face 4 and forms frontlighting, while partly from bottom reflection face 4
The light for penetrating out can also be reflected away via the reflector plate 6 padded in the bottom of LED light source 5, form the front of low-angle part
Illumination.This part is mainly used in the illumination of the area just above of LED light source 5.
By optimizing and revising for the structural parameters to lens and each Surface Parameters, three kinds of illumination sides as described above are capable of achieving
The equilibrium assignment of formula light energy, so as to realize Uniform Illumination.
Fig. 6 is one and is dissipated along the light in cylinder cross-sectional direction according to the embodiment of the present invention light beam designed shown in Fig. 2
Angular distribution characteristic, abscissa represents light beam along the present embodiment in figure（Cylinder）With the angle of axis 7 in cross-sectional direction（I.e.
Light dispersion angle）, ordinate is normalization Relative light intensity degree（%）, it can be seen that divergence of beam angle is opened on cross section
Up to more than 70 degree of angle.In order to analyze the colourity situation under the conditions of so big dispersion angle, Fig. 7, Fig. 8 illustrate to pass
System lens are contrasted with one of the colourity effect of the embodiment of the present invention, and Fig. 7 is one using traditional refractive Iy（It is existing shown in Fig. 1
There is technology）The colorimetric analysis of the pantoscopic lens of design, it can be seen that in the center section of illumination because the problem of dispersion occurs
Rainbow striped；Fig. 8 is the colourity effect of the embodiment of the present invention, it can be seen that the distribution of color in illumination region is uniform, compares
Fig. 7, chromatic dispersion problem is under control, and rainbow striped is also effectively suppressed.
Claims (7)
1. a kind of bis- refraction-reflection lens of LED for downward back radiant, bis- refraction-reflection lens of the LED are to adopt
The axial symmetry entity being made of transparent material, it is characterized in that：Bis- refraction-reflection lens of LED are by incident plane of refraction, central reflective
Face, side exit facet, bottom reflection face composition, the incident plane of refraction, central reflective face, side exit facet, bottom reflection face are
Curved surface, the incident plane of refraction is located at bis- refraction-reflection lens bottoms of LED, and the central reflective face connects into side exit facet
It is upper surface, central reflective face is located at incident plane of refraction top, and the side exit facet connects bottom reflection face and central reflective face,
Large angle illumination is main to be produced by central reflective face with total reflection mode；The low-angle main refraction shape by side exit facet of illumination
Into.
2. bis- refraction-reflection lens of LED according to claim 1, it is characterized in that：The central reflective face, side exit facet
It is smooth surface.
3. bis- refraction-reflection lens of LED according to claim 1 and 2, it is characterized in that：The bottom reflection face is smooth
Curved surface.
4. bis- refraction-reflection lens of LED according to claim 1 and 2, it is characterized in that：The incident plane of refraction is a light
Sliding curved surface.
5. bis- refraction-reflection lens of LED according to claim 1, it is characterized in that：The incident plane of refraction, central reflective
Face, side exit facet, bottom reflection face are smooth surface, incident plane of refraction, central reflective face, side exit facet, bottom reflection face
Contour line characterized by following multinomial：
,
Wherein z is the height of contour line, and r is distance of the contour line relative to axis,c,k,A 1,A 2, A 3, A 4... according to
The parameter that design object can be optimized.
6. bis- refraction-reflection lens of LED according to claim 1, it is characterized in that：The incident plane of refraction, central reflective
Face, side exit facet, the bore in bottom reflection face and radial height are the parameters that can be optimized according to design object.
7. bis- refraction-reflection lens of LED according to any claim of claim 1,2,5,6, it is characterized in that：Target
Illumination region is divided into large angle illumination region, low-angle illumination region, front photograph according to the distance apart from LED light source radial distance
Three, area pellucida domain part, large angle illumination region, low-angle illumination region, frontlighting region brightness of illumination it is uniform.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410202369.0A CN103994396B (en) | 2014-05-14 | 2014-05-14 | A kind of bis- refraction-reflection lens of LED for downward back radiant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410202369.0A CN103994396B (en) | 2014-05-14 | 2014-05-14 | A kind of bis- refraction-reflection lens of LED for downward back radiant |
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| Publication Number | Publication Date |
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| CN103994396A CN103994396A (en) | 2014-08-20 |
| CN103994396B true CN103994396B (en) | 2017-07-11 |
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| CN201410202369.0A Expired - Fee Related CN103994396B (en) | 2014-05-14 | 2014-05-14 | A kind of bis- refraction-reflection lens of LED for downward back radiant |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104296070B (en) * | 2014-08-28 | 2019-12-27 | 新烨光学(深圳)有限公司 | Novel wide-angle lens |
| CN106959554B (en) * | 2017-05-08 | 2023-06-27 | 胜蓝科技股份有限公司 | Reflective astigmatic lens, backlight module and liquid crystal display device |
| JP7324090B2 (en) * | 2019-08-29 | 2023-08-09 | 株式会社小糸製作所 | Vehicle indicator light |
| CN113534532A (en) * | 2020-04-22 | 2021-10-22 | 华为技术有限公司 | Lens, backlight module and terminal equipment |
| CN111552115B (en) * | 2020-05-11 | 2023-06-20 | 深圳创维－Rgb电子有限公司 | Backlight module and display device |
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| CN103245985A (en) * | 2013-05-09 | 2013-08-14 | 苏州奥浦迪克光电技术有限公司 | LED lens used for direct type liquid crystal backlight |
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| KR100754169B1 (en) * | 2004-11-24 | 2007-09-03 | 삼성전자주식회사 | Side emitting device, back light unit using the same as a light source and liquid display apparatus employing it |
| CN100472269C (en) * | 2005-02-08 | 2009-03-25 | 友达光电股份有限公司 | Dished lens and point source of light in back lighting module |
| JP5188077B2 (en) * | 2007-03-02 | 2013-04-24 | 株式会社光波 | Light direction changing element and planar light emitting device |
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| CN102705777B (en) * | 2012-06-29 | 2015-05-20 | 冠捷显示科技（厦门）有限公司 | Secondary lens with bottom of curved surface structure |
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| CN204005733U (en) * | 2014-05-14 | 2014-12-10 | 郑睿韬 | Bis-refraction-reflection lens of LED for downward back radiant |
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|---|---|---|---|---|
| CN203240489U (en) * | 2013-04-17 | 2013-10-16 | 杭州奥通科技有限公司 | LED secondary cylindrical surface lens for direct type backlight source |
| CN103245985A (en) * | 2013-05-09 | 2013-08-14 | 苏州奥浦迪克光电技术有限公司 | LED lens used for direct type liquid crystal backlight |
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