CN203240489U - LED secondary cylindrical surface lens for direct type backlight source - Google Patents
LED secondary cylindrical surface lens for direct type backlight source Download PDFInfo
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- CN203240489U CN203240489U CN 201320193743 CN201320193743U CN203240489U CN 203240489 U CN203240489 U CN 203240489U CN 201320193743 CN201320193743 CN 201320193743 CN 201320193743 U CN201320193743 U CN 201320193743U CN 203240489 U CN203240489 U CN 203240489U
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Abstract
The utility model discloses an LED secondary cylindrical surface lens for a direct type backlight source. The LED secondary cylindrical surface lens is characterized in that the LED secondary cylindrical surface lens is an axisymmetric entity made of transparent materials, the LED secondary cylindrical surface lens comprises an incident plane, a reflective plane and an emergent plane, the incident plane is arranged on the lower portion of the LED secondary cylindrical surface lens and is a curved surface, the reflective plane is arranged on the bottom face of the LED secondary cylindrical surface lens and is the plane, and the emergent plane is a curved surface. The contour line of the incident plane and the emergent plane in the cylindrical surface normal direction is characterized in that z is the height of the contour line, and r is the distance between the contour line and the axis of the LED secondary cylindrical surface lens. The LED secondary cylindrical surface lens is concise in structure, under the same diffusion ratio, the product is high in light uniformity, the assembling is easy, and energy sources are saved.
Description
Technical field
The utility model relates to a kind of LED quadric cylinder lens for the downward back radiant, mainly is applicable to the backlight of downward back radiant, or the LED-backlit billboard.
Background technology
Back light is widely applied in conventional liquid crystal (LCD) and large-scale advertisement plate.And traditional cold-cathode tube (CCFL) backlight is replaced by light emitting diode (LED) backlight gradually.And the LGP that initial backlight is processed by back side carving is realized, light source (CCFL of line source or the LED of spot light) imports light into from the LGP side, and this kind mode is owing to the restriction of LGP technology, and efficient is not high.Directly-down liquid crystal display backlight source then Effective Raise the light efficiency problem.Because LED belongs to the spot light of limited angle light beam, when being used for direct LED backlight, need hundreds of even thousands of whites or three-primary color LED to arrange and the formation area source, form a large-area planar and throw light on.
Spot light is changed into area source, is the key technology in LED-backlit source.The light source uniformity and mixed light height are two very important performance indications of backlight.
Improvement for optical uniformity is the key factor of restriction LCD direct-light-type backlight.The LED-backlit source is closely relevant with the light distribution of LED based on the uniformity of the area source of led array.When not having mounted lens, the LED light distribution distributes near Lang Baite.When utilizing traditional dome-type lens as the LED-backlit source, can change the light distribution of LED, reduce beam angle, so that light more concentrates near the LED axis.No matter adopt any LED packaged type, when using it for the backlight of directly-down type LCD, because light distribution too concentrates near the axis or concentrate on the side, so that backlight is difficult to obtain high evenness.Therefore the optical uniformity backlight that becomes directly-down type LCD is difficult to the problem that solves the most.When the LED direct-light-type backlight adopted traditional LED packing forms, in order to improve the light uniformity, usually adopting increased thickness, perhaps increased the LED density of arranging.This kind solution has improved the volume and weight of backlight, thereby has restricted the application and development of LCD direct-light-type backlight.The mixed light height is backlight another one key index.Widely used in the market is a kind of circular secondary lens (as shown in Figure 1).This scheme with LED light through two circular concave surfaces, thereby increase LED light dispersion angle, by array arrangement, realize the backlight solution that the low less led array of mixed light height is arranged.These scheme lens are along diffusion LED light energy on the 360 degree directions, so relatively large for the reduction of luminous intensity, during especially large diffusion ratio (diffusion ratio is the ratio of space between light sources and mixed light height); This kind lens generally produce circular light spot simultaneously, in the situation that led array is arranged, easily form blackening, all lens must be installed on each LEDs in addition, and the required precision of assembling, so that this backlight solution has higher assembly cost.
The utility model content
Technical problem to be solved in the utility model is to overcome existing above-mentioned deficiency in the prior art, and a kind of new LED quadric cylinder lens that are used for the downward back radiant are provided, and can improve the product light uniformity, and technique effect is good and cost is low.
The utility model solves the problems of the technologies described above the technical scheme that adopts: the LED quadric cylinder lens that should be used for the downward back radiant, it is characterized in that the axial symmetry entity of described LED quadric cylinder lens for adopting transparent material to make, LED quadric cylinder lens comprise the plane of incidence, reflecting surface and exit facet, the described plane of incidence is positioned at LED quadric cylinder lens bottom and is curved surface, described reflecting surface is positioned at LED quadric cylinder lens bottom surface and is the plane, and described exit facet is curved surface.
Exit facet described in the utility model adopts light diffused structure.
The plane of incidence described in the utility model adopts light diffused structure.
Reflecting surface described in the utility model adopts light diffused structure.
Smooth diffused structure described in the utility model is generally microballoon face lens arra or microprism array or matsurface or does carving and process.
The plane of incidence described in the utility model and exit facet are characterized by following multinomial along the outline line of cylinder normal direction:
Wherein z is the height of outline line, r be outline line with respect to the distance of LED quadric cylinder lens axis,
c,
k,
A 1,
A 2,
A 3,
A 4... be the parameter that can be optimized according to design object.
As a kind of preferred, the above-mentioned plane of incidence of the utility model, exit facet can adopt the parameter in the table 1 in the specific embodiment along the parameter in the outline line formula of cylinder normal direction.
As further preferred, the plane of incidence and junction, bottom surface are 2 millimeters with respect to the distance of LED quadric cylinder lens axis, and exit facet and junction, bottom surface are 7.5 millimeters with respect to the distance of LED quadric cylinder lens axis.
The utility model is simple for structure, and the product light uniformity is high under identical diffusion ratio, and assembling is simple, energy savings.
Description of drawings
Fig. 1 is the round lens diffusion light beam schematic diagram of prior art.
Fig. 2 is the plane of incidence of the utility model embodiment, when exit facet is matsurface along the diffusion light beam schematic diagram on the cylinder cross-sectional direction.
Fig. 3 is the plane of incidence of the utility model embodiment, when exit facet is matsurface along the beam angle distribution schematic diagram on the cylinder direction.
Fig. 4 is that the plane of incidence, the exit facet when cylindrical lens is in the shiny surface situation, and light is along the schematic diagram of cylinder direction generation total reflection phenomenon.
Fig. 5 be the utility model embodiment along the beam angle distribution schematic diagram of cylinder cross-sectional direction, wherein X-axis represent light beam on the cylinder cross section with the normal angle (degree) of light source luminescent face, Y-axis represents Relative light intensity degree (%).
Fig. 6 is the utility model embodiment along the beam angle distribution schematic diagram of cylinder direction wherein, X-axis represent light beam along on the cylinder direction with the normal angle (degree) of light source luminescent face, Y-axis represents relative illumination (%).
The specific embodiment
For making the purpose of this utility model, technical scheme and advantage more clear, below in conjunction with the implementation case and with reference to accompanying drawing, the utility model is described in further details.
LED quadric cylinder lens described in the utility model (are called for short cylindrical lens, lower same) be the axial symmetry entity that adopts transparent material to make, it is light receiving surface that LED quadric cylinder lens comprise plane of incidence 1(), reflecting surface 2 and exit facet 3(be exiting surface), the plane of incidence 1 that is used for reception light is positioned at LED quadric cylinder lens bottoms (center) and is curved surface, led light source 4 is installed on the plane of incidence 1 below, described reflecting surface 2 is positioned at LED quadric cylinder lens bottom surface and is the plane, and the light reflection that is used for upper surface (being exit facet 3) is reflected returns upper surface.Described exit facet 3 is curved surface.
The utility model because the plane of incidence 1 is curved surface with exit facet 3 and both curvature different (parameter that is the plane of incidence 1 in the following formula, exit facet 3 is not identical, perhaps z, the r in the following formula replaces when representing respectively the plane of incidence 1, exit facet 3 along the height and distance in the cylinder normal direction outline line with z1, r1 and z3, r3 respectively, about the parameter in z1, the r1 formula from different about the parameter in z3, the r3 formula), enlarged the distribution consistency degree of light beam, the reduction less of luminous intensity, and be difficult for producing circular light spot or blackening, assemble also fairly simple.
The curvature of the utility model exit facet 3 can be adjusted through the statistics that arrives the distribution situation of exit facet 3 after the refraction of the plane of incidence 1 according to light beam, has greatly improved the light utilization of the present embodiment.
The plane of incidence 1 described in the utility model and exit facet 3 are characterized by following multinomial along the outline line of cylinder normal direction:
Wherein z is the height of outline line, r be outline line with respect to the distance of LED quadric cylinder lens axis,
c,
k,
A 1,
A 2,
A 3,
A 4... be the parameter that can be optimized according to design object.
As a kind of special case, the plane of incidence 1 and (reflecting surface 2 junctions, junction, bottom surface, it is the distance of Fig. 2 plane of incidence 1 bottom and LED quadric cylinder lens axis, that the plane of incidence 1 is along the special case of the outline line r1 of cylinder normal direction) junction is 2 millimeters with respect to the distance of LED quadric cylinder lens axis, exit facet 3 and (reflecting surface 2 junctions, junction, bottom surface, being the bottom distance with LED quadric cylinder lens axis of Fig. 2 exit facet 3, is that exit facet 3 is along the special case of the outline line r3 of cylinder normal direction) be 7.5 millimeters with respect to the distance of LED quadric cylinder lens axis.
As further improvement, part or all in the plane of incidence 1 of the present utility model, reflecting surface 2, the exit facet 3 adopts light diffused structure, and for example other light scattering structure is processed or adopted to matsurface or carving.
Referring to Fig. 2, the present embodiment plane of incidence 1, exit facet 3 all adopt coarse (non-smooth) diffusingsurface, behind first diffusingsurface of light process from led light source 4, light is broken up, the light of breaing up can be continued to break up by second concave surface diffusingsurface, the light of led light source 4 emissions has been enlarged dispersion angle along optical axis by two concave surfaces like this, and simultaneously owing to the diffusingsurface effect, the dispersion angle distributed areas after the expansion increase.
Fig. 5 is that light beam distributes along the light dispersion angle on the cylinder cross-sectional direction, can find out that the divergence of beam angle has been opened at cross section.And this side up, cylindrical lens is opened the light angle of led light source 4, realize uniformization effect, so this side up, the spacing that improves under the whole mixed light thickness prerequisite between the led light source 4 can not increased, thereby under identical illuminating area condition, save striation quantity, realize the even effect of preferably illumination.
Fig. 3 is that cylindrical lens is along the light beam projecting figure of cylinder direction, along the cylinder direction, lens thickness does not change, light angle can not change along optical axis direction, because the plane of incidence 1 and exit facet 3 are matsurface (carving is processed or blasting treatment), light generation scattering and avoid the generation of total reflection, thus the utilization rate of light improved, and improve light along the dispersion angle width of cylinder direction.Fig. 4 shows when the plane of incidence 1 of cylindrical lens and exit facet 3 are shiny surface, when light enters between these two faces, total reflection phenomenon can occur in part light, thereby so that this part light in the inner constantly reflection of cylindrical lens and misfire, thereby affect the utilization rate of light.
Fig. 6 is that light beam is along the angle distribution of cylinder direction.Because the characteristic of cylindrical lens, the divergence of beam angle has been kept the original Lambert distribution character of LED substantially this side up.So this side up, on the striation led light source 4 quantity with do not have lens condition under do not compare and reduce, improved on the one hand brightness, also reduced simultaneously the assembly precision requirement of the relative led light source 4 of cylindrical lens, compare the circular propagation lens arrangement among Fig. 1, a cylindrical lens can cover several led light sources 4 simultaneously, has greatly improved lens arrangement workload and assembly precision requirement, thereby guaranteeing not lose under the prerequisite of brightness output the reduction of realization material cost and assembly cost.
As a kind of preferred, the above-mentioned plane of incidence 1 of the utility model, exit facet 3 can adopt parameter in the table 1 along the parameter in the outline line formula of cylinder normal direction.The plane of incidence 1 cross-sectional width 4mm, exit facet 3 cross-sectional width 15mm.The height of led light source 4 is 1.5mm, and the LED light-emitting area is 1mmx1mm.
A specific embodiment of table 1, lens parameter
| Parameter | The plane of incidence | Exit facet |
| c | -0.00126 | 0 |
| k | 1.744537 | 0 |
| A1 | 0 | -8.414013E-2 |
| A2 | 0.0199312 | -1.0176211 |
| A3 | 0 | 8.631E-5 |
| A4 | -0.00150046 | -3.8E-5 |
| A5 | 0 | 3.066E-2 |
| A6 | 2.1444E-5 | -5.13469E-3 |
| A7 | 0 | 2.027198E-3 |
| A8 | -1.954497E-7 | 0 |
The comparison of table 2, the utility model embodiment and conventional lenses technique effect
| The contrast project | The circular diverging lens of tradition | The utility model embodiment cylindrical lens |
| The assembly work amount | Many, each led |
Few, a cylindrical lens can cover some |
| Luminous intensity under the identical diffusion ratio | Low | High |
| Led light source general power under the same brightness | Height needs larger led light source general power to improve back light source brightness | Low, can adopt the output of more middle low power led |
Claims (8)
1. LED quadric cylinder lens that are used for the downward back radiant, it is characterized in that: the axial symmetry entity of described LED quadric cylinder lens for adopting transparent material to make, LED quadric cylinder lens comprise the plane of incidence, reflecting surface and exit facet, the described plane of incidence is positioned at LED quadric cylinder lens bottom and is curved surface, described reflecting surface is positioned at LED quadric cylinder lens bottom surface and is the plane, and described exit facet is curved surface.
2. the LED quadric cylinder lens for the downward back radiant according to claim 1 is characterized in that: described exit facet employing light diffused structure.
3. the LED quadric cylinder lens for the downward back radiant according to claim 1 and 2 is characterized in that: described plane of incidence employing light diffused structure.
4. the LED quadric cylinder lens for the downward back radiant according to claim 1 and 2 is characterized in that: described reflecting surface employing light diffused structure.
5. LED quadric cylinder lens for the downward back radiant according to claim 1 and 2, it is characterized in that: the described plane of incidence and exit facet are characterized by following multinomial along the outline line of cylinder normal direction:
Wherein z is the height of outline line, and r is that outline line is with respect to the distance of LED quadric cylinder lens axis.
6. LED quadric cylinder lens for the downward back radiant according to claim 5 is characterized in that: the described plane of incidence, exit facet adopt parameter in the table 1 along the parameter in the outline line formula of cylinder normal direction.
7. LED quadric cylinder lens for the downward back radiant according to claim 5, it is characterized in that: the plane of incidence and junction, bottom surface are 2 millimeters with respect to the distance of LED quadric cylinder lens axis, and exit facet and junction, bottom surface are 7.5 millimeters with respect to the distance of LED quadric cylinder lens axis.
8. LED quadric cylinder lens for the downward back radiant according to claim 6, it is characterized in that: the plane of incidence and junction, bottom surface are 2 millimeters with respect to the distance of LED quadric cylinder lens axis, and exit facet and junction, bottom surface are 7.5 millimeters with respect to the distance of LED quadric cylinder lens axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320193743 CN203240489U (en) | 2013-04-17 | 2013-04-17 | LED secondary cylindrical surface lens for direct type backlight source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320193743 CN203240489U (en) | 2013-04-17 | 2013-04-17 | LED secondary cylindrical surface lens for direct type backlight source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203240489U true CN203240489U (en) | 2013-10-16 |
Family
ID=49317784
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320193743 Expired - Fee Related CN203240489U (en) | 2013-04-17 | 2013-04-17 | LED secondary cylindrical surface lens for direct type backlight source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203240489U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196097A (en) * | 2013-04-17 | 2013-07-10 | 杭州奥通科技有限公司 | LED quadratic cylindrical lens for direct type backlight source |
| CN103994396A (en) * | 2014-05-14 | 2014-08-20 | 郑睿韬 | LED secondary refraction and reflection lens for direct lighting type backlight source |
-
2013
- 2013-04-17 CN CN 201320193743 patent/CN203240489U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196097A (en) * | 2013-04-17 | 2013-07-10 | 杭州奥通科技有限公司 | LED quadratic cylindrical lens for direct type backlight source |
| CN103196097B (en) * | 2013-04-17 | 2016-01-20 | 杭州奥通科技有限公司 | A kind of LED quadric cylinder lens for downward back radiant |
| CN103994396A (en) * | 2014-05-14 | 2014-08-20 | 郑睿韬 | LED secondary refraction and reflection lens for direct lighting type backlight source |
| CN103994396B (en) * | 2014-05-14 | 2017-07-11 | 郑睿韬 | A kind of bis- refraction-reflection lens of LED for downward back radiant |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 310012, Hangzhou, Zhejiang Province, 98 ancient Pier Road, Xicheng new seat, 6 floor, A-3, Xihu District Patentee after: HANGZHOU AUTOON ENVIRONMENTAL TECHNOLOGY STOCK Corp. Address before: 310012, Hangzhou, Zhejiang Province, 98 ancient Pier Road, Xicheng new seat, 6 floor, A-3, Xihu District Patentee before: HANGZHOU AUTOON ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Address after: 310012, Hangzhou, Zhejiang Province, 98 ancient Pier Road, Xicheng new seat, 6 floor, A-3, Xihu District Patentee after: HANGZHOU AUTOON ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Address before: 310012, Hangzhou, Zhejiang Province, 98 ancient Pier Road, Xicheng new seat, 6 floor, A-3, Xihu District Patentee before: Hangzhou Autoon Technology Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131016 Termination date: 20210417 |