CN103925557B - Even optical lens and include the LED light source module of this even optical lens - Google Patents
Even optical lens and include the LED light source module of this even optical lens Download PDFInfo
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- CN103925557B CN103925557B CN201410117760.0A CN201410117760A CN103925557B CN 103925557 B CN103925557 B CN 103925557B CN 201410117760 A CN201410117760 A CN 201410117760A CN 103925557 B CN103925557 B CN 103925557B
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Abstract
Even optical lens, described even optical lens is revolving body, is the inner concave shape structure of the rotationally symmetrical axial symmetry along even optical lens including top exit facet, sidepiece exit facet, the plane of incidence and baseplane, described top exit facet and the described plane of incidence；On the cross section of rotation axes of symmetry, described top exit facet includes extending curve and parabola；Described sidepiece exit facet includes straightway and arc；The described plane of incidence includes the top curve curve, the first step curve, the second step curve and the lateral curve that are sequentially connected with.The fine structure of the even optical lens of the present invention, it is possible to realize Uniform Illumination when ultra-thin light mixing distance, super large space between light sources.
Description
Technical field
The present invention relates to optical design arts, particularly to a kind of even optical lens and the LED light source module including this even optical lens.
Background technology
LED, because of the features such as it is energy-conservation, colour gamut width, life-span length, governing speed are fast, more traditional type fluorescent light that compacts, has shown huge advantage gradually.Illuminate in mainstream technology route in LED-backlit, have side entering type and two kinds of mainstream technology routes of straight-down negative.Comparing the side entering type side of viewing area (LED be arranged on), the Core Superiority of straight-down negative technology (LED is placed on bottom display) including: light source heat radiation area is big, it is simple to heat radiation, and reliability is high；Easily controllable regional area brightness, contrast and dynamic characteristic are better；The light loss of straight-down negative light path is less；Saving light guide plate, backlight cost is substantially reduced.
But, based on light source cost consideration, it is necessary to strengthen direct-type backlight space between light sources and reduce light source usage quantity as far as possible；Meanwhile, comparing side entering type technology, direct-type backlight technology requires there is bigger light mixing distance, thus causing television receiver body thicker.Therefore, how in the light source arrangement situation of big spacing, to light source design optical system so that complete Uniform Illumination design with the thinnest thickness, be a major challenge of direct-type backlight technology.
For direct-type backlight optical design techniques, in prior art, CN202521495U and US8348475 coordinates incident curved surface to realize by the positive camber of similar shape of a saddle shape, comparatively uniform circular light spot can be formed, but this technology can only substantially meet the backlight product application of more than 25mm light mixing distance (i.e. light source luminescent face to the distance of display screen), space between light sources about 80mm, is presently available in 25mm thickness backlight technology.If but fuselage light mixing distance is reduced to 15mm, spot radius will reduce nearly one times, if the quantity of light source required for reaching identical homogeneity level will increase by 3 times, it is impossible to meets ultra-thin direct-type backlight designing requirement.
Summary of the invention
It is an object of the invention to: the even optical lens of a kind of big suitable in space between light sources and that light mixing distance is short backlight product is provided.
In order to solve above-mentioned technical problem, the invention provides a kind of even optical lens, described even optical lens is revolving body, is the inner concave shape structure of the rotationally symmetrical axial symmetry along even optical lens including top exit facet, sidepiece exit facet, the plane of incidence and baseplane, described top exit facet and the described plane of incidence；On the cross section of rotation axes of symmetry,
Described top exit facet includes extending curve and parabola；
Described sidepiece exit facet includes straightway and arc；
The described plane of incidence includes the top curve curve, the first step curve, the second step curve and the lateral curve that are sequentially connected with.
The starting point of described extension curve is positioned on described rotation axes of symmetry, maximum slope herein, and the end of described extension curve intersects with described parabola, and slope is minimum herein.
The starting slope of described extension curve is more than 1.
Distance between straightway and the rotation axes of symmetry of described sidepiece exit facet becomes larger along top-down direction, and the distance between described arc and rotation axes of symmetry becomes larger along top-down direction.
Described top curve curve is the middle part curve that two sideleads are gradually increased respectively gently.
The slope edge of described first step curve is gradually reduced away from described rotationally symmetrical direction of principal axis, and in smoothing junction with top curve curve and the second step curve respectively.
Described second step curve is smoothed curve.
Described lateral curve includes straightway and outwards launches gradually and curved section that slope is gradually reduced.
The angle of intersection of described lateral curve and described second step curve range for 90 degree to 95 degree.
Connect the radius 0.1mm of the transition chamfering of described second step curve and described lateral curve.
The material of described even optical lens is PMMA or PC resin.
Described baseplane is frosting.
The parabola of described top exit facet is connected with the straightway of described sidepiece exit facet, and the upper area of described straightway is frosting, the height 0.5mm of described frosting.
A further object of the present invention is in that: providing a kind of LED light source module including above-mentioned even optical lens, also include reflecting paper and substrate, described reflecting paper is adhered on described substrate；Described LED light source is SMD light source, and the exiting surface of LED light source is circular flat, and described exiting surface flushes with the baseplane of even optical lens；Described LED light source is arranged on the substrate, and the baseplane of even optical lens is provided with multiple fixing foot, and the plurality of fixing foot is by sticky stuff and described substrate bonding.
Described LED light source and even optical lens are multiple, according to array arrangement, are placed on described substrate, form large area lighting.
The baseplane of described even optical lens adopts the structure that plane formula thickeies, and it thickens highly equal to the thickness of LED light source.
The described plane of incidence is coated with anti-reflection film.
Relative to prior art, the method have the advantages that
1, the fine structure of the even optical lens of the present invention, it is possible to realize Uniform Illumination when ultra-thin light mixing distance, super large space between light sources.Wherein, top exit facet is provided with one section and extends curve and one section of parabolic curve, and two different directions of the light alignment sent by LED respectively form total reflection, at utmost ensure that spot size and the uniformity of colourity, illumination.
2, the baseplane of the even optical lens of the present invention is frosting, thus ensureing that the no longer vertical directive screen of light reflected from even optical lens inner chamber forms bright spot.
3, the parabolical upper area of stating of the top exit facet of the even optical lens of the present invention is frosting, is scattered by the uniform light importing center, screen can be avoided bright line occur near LED centre of luminescence local location.
4, the even optical lens body of the present invention only need to divide mould up and down, and easy to process, processing cost is low；The design structure of the even optical lens of the present invention includes discontinuous construction, frosted is arranged, and can both ensure that curved surface occurs without back-off so that mould only needs upper and lower two moulds, and mould structure is extremely simple, and processing cost is low.
5, the even optical lens of the present invention to the adopting surface mounted LED light source of dissimilar luminous intensity distribution, can accurately realize uniform-illumination distribution, be widely used.
6, lens yardstick is moderate, both ensure that design accuracy turn avoid the excessive actual light mixing distance caused of lens and is greatly decreased.
Accompanying drawing explanation
Fig. 1 is the schematic perspective view of the embodiment of the present invention one；
Fig. 2 is the sectional view of the embodiment of the present invention one；
Fig. 3 is the light schematic diagram of the embodiment of the present invention one；
Fig. 4 is one of the embodiment of the present invention two light schematic diagram；
Fig. 5 is the two of the light schematic diagram of inventive embodiments two；
Fig. 6 is one of light schematic diagram of the embodiment of the present invention three；
Fig. 7 is the two of the light schematic diagram of the embodiment of the present invention three；
Fig. 8 is the schematic diagram of the embodiment of the present invention four；
Fig. 9 is the schematic diagram that the embodiment of the present invention four includes multiple light source module；
Figure 10 is the simulation Illumination Distribution figure of the embodiment of the present invention four；
Figure 11 is the schematic diagram of the embodiment of the present invention five.
Detailed description of the invention
Embodiment one
Referring to Fig. 13.A kind of even optical lens, described even optical lens is revolving body, and including top exit facet 12, sidepiece exit facet 13, the plane of incidence 14 and baseplane 15, described top exit facet 12 and the described plane of incidence 14 are the inner concave shape structure of rotation axes of symmetry 21 symmetry along even optical lens；On the cross section of rotation axes of symmetry 21,
Described top exit facet 12 includes extending curve 221 and parabola 222；
Described sidepiece exit facet 13 includes straightway 231 and arc 232；
The described plane of incidence 14 includes top curve curve the 241, first step curve the 242, second step curve 243 of being sequentially connected with and lateral curve 244.
In order to state the structure of even optical lens more intuitively, from cross section, " line " is adopted to describe top exit facet, sidepiece exit facet, the plane of incidence；Curved surface in described " line " actually corresponding axonometric chart.
Described extension curve 221(spinning axis of symmetry 21 stretches out) starting point be positioned on described rotation axes of symmetry 21, maximum slope herein, the end of described extension curve 221 intersects with described parabola 222, and slope is minimum herein.
The parabola 222 of described top exit facet is connected with the straightway 231 of described sidepiece exit facet.
The starting slope of described extension curve 221 is more than 1.
Distance between described straightway 231 and rotation axes of symmetry 21 becomes larger along top-down direction, and the distance between described arc 232 and rotation axes of symmetry 21 becomes larger along top-down direction.
Described top curve curve 241 is mild near the middle part of rotation axes of symmetry 21, and after about 0.3mm, slope is gradually increased.The light path of this part is: the light 302 emitted from LED light source 301, after top curve curve 241 incidence, after extension curve 221 total reflection of top exit facet 12, then from straightway 231 outgoing of sidepiece exit facet 13, the light after outgoing becomes the direction outgoing of 60-75 degree with optical axis.The effect of this part is to be totally reflected through the extension curve 221 of top exit facet 12 by the light that LED light source 301 is less with the angle of optical axis, then through straightway 231 outgoing of sidepiece exit facet 13, forms the light 302 being emitted directly toward screen.
The slope of described first step curve 242 is along being gradually reduced away from described rotation axes of symmetry 21 direction, in smoothing junction with top curve curve 241 and the second step curve 243 respectively.The light path of this part is: the light 303 emitted from LED light source 301, and after the first step curve 242 incidence, the parabola 222 then through top exit facet 12 is totally reflected, then from straightway 231 outgoing of sidepiece exit facet 13；The light 303 of final outgoing there is half (part) 3031 be emitted directly toward screen, second half (part) 3032 directive reflecting paper, project screen through reflecting paper reflection.The light 3032 of the light 3031 and directive reflecting paper that are emitted directly toward screen is 70 degree to 90 degree with optical axis included angle.This some light defines the principal rays of maximum angle, and for light mixing distance 15mm light mixing distance, the interval covered on screen is mainly the radius region more than 60mm.
Described second step curve 243 is smoothed curve.The light path of this part is: the light 304 emitted from LED light source 301, after the second step curve 243 incidence, parabola 222 then through top exit facet 12 is totally reflected, then from straightway 231 outgoing of sidepiece exit facet 13, the angle between light and optical axis after outgoing, less than 75 degree, projects screen then through reflecting paper reflection.This some light almost will all be mapped to reflecting paper back reflection to screen, and its interval radius covered on screen is less than light 303.
Described lateral curve 244 includes straightway and outwards launches gradually and curved section that slope is gradually reduced.
The angle of intersection of described lateral curve 244 and described second step curve 243 is 90 degree to 95 degree.Preferably, the radius 0.1mm of the connection chamfering between described lateral curve 244 and described second step curve 243.The light path of this part is: the light 305 emitted from LED light source 301, after the incidence of lateral curve 244, then from arc 232 outgoing of sidepiece exit facet 13, then projects screen.This some light incident angle is between 65-75 degree, the light mixing distance for 15mm, and the interval covered on screen is mainly radius more than the 40mm region less than 70mm.
The material of described even optical lens is PMMA or PC resin.
All curved surfaces of the even optical lens of the present embodiment all have only to upper and lower mould depanning, and mould is simple, and die cost and processing cost are relatively low.
Embodiment two
Referring to Fig. 45.Embodiment two and embodiment one are different in that: described baseplane 15 is frosting.
It should be noted that, in whole design, it does not have light directly arrives the position near axle center without peripheral reflection paper, this is because when light mixing distance is minimum, center brightness value to be reduced to less than the 10% of original situation, and the form of any direct incidence is all likely to occur bright spot.And in the design, even if not originally directly being mapped to the design at center, owing to mismachining tolerance and light source luminescent attribute off-design value also very likely cause center illumination apparently higher than the problem around forming bright spot.
It has been investigated that, on lateral curve 244, after the light refraction of submarginal position, downward angle is minimum, and this some light is easily created higher center illumination after substrate reflects.Referring to Fig. 4, from the light 401 that LED light source 301 emits, on lateral curve 244, submarginal position is incident, is then passed through sidepiece exit facet 13 and penetrates, owing to the form of Fresnel loss has some light to be reflected back lens.This some light will be mapped to bottom lens, outgoing after reflecting then through reflecting paper or substrate after injection lens.Owing to the diffuse-reflecting power of reflecting paper or substrate is relatively low, and this some light can form straight rays 402 just in minute surface direction；And owing to light mixing distance is only small, only need the such direct projection light 402 of small part, will result in and receive center brightness significantly high on screen.
In the present embodiment, referring to Fig. 5, to be that baseplane 15 all arranges frosted structure bottom lens, the light 401 being originally likely to be formed smaller angle outgoing is made to cause light disperse 403 due to the frosted structure of bottom, form divergent rays 404 to all directions outgoing, it is therefore prevented that this some light is directly mapped to low-angle by paracentral position.
Embodiment three
Referring to Fig. 67.Embodiment three and embodiment one are different in that: the upper area 502 of the straightway 231 of described sidepiece exit facet 13 is frosting, the height 0.5mm of described frosting.
Referring to Fig. 6, due to the reason of mismachining tolerance and light source luminescent attribute off-design value, from the light 501 that LED light source 301 emits, on the second step curve 243, submarginal position is incident, reflecting through parabola 222, then the straightway of sidepiece exit facet 13 penetrates 231 outgoing；Owing to the angle of light 501 downward outgoing arrival reflecting paper is only small, the problem that the position brightness nearer with center improves very easily occurs after reflecting paper reflects.Finding through research, this some light 501 all concentrates on the upper area 502 of the parabola 222 of top exit facet 222, and it is highly usually no more than 0.5mm.Referring to Fig. 7, after this upper area 502 is carried out frosted process, the light 503 that light 501 disperse is multiple angle outgoing of smaller angle outgoing originally so that the light energy arriving center reduces.
Embodiment four
Referring to Fig. 8 10.The present embodiment is the LED light source module including even optical lens, also includes reflecting paper (not shown) and substrate 603, and described reflecting paper is adhered on described substrate 603；Described LED light source 601 is SMD light source, and the exiting surface 6011 of LED light source 601 is circular flat, and described exiting surface 6011 flushes with the baseplane 15 of even optical lens；Described LED light source 601 is arranged on described substrate 603, and the baseplane 15 of even optical lens is provided with multiple fixing foot 602, and the plurality of fixing foot 602 is bonding with described substrate 603 by sticky stuff.
Described adopting surface mounted LED light source 601 is of a size of 3.5 × 2.8mm.
Described LED light source 601 and even optical lens are multiple, according to array arrangement, are placed on described substrate 603, form large area lighting.
In the present embodiment, the distance between backlight receptor 604 and described exiting surface 6011 is 15mm.
Figure 10 is the optical analog result of the present embodiment.Arranging the backlight reflecting paper that reflecting layer is high reflectance, reflectance is 80-90%.Simulation effect is visible, when 15mm light mixing distance, can form uniform illuminance, be applied to the light source interval of back lighting up to more than 80mm, greatly reduce quantity of light source and saved cost within radius 80mm.
Embodiment five
Referring to Figure 11.Embodiment five is in that from the different supports of embodiment one: the structure 702 that the baseplane 15 of even optical lens adopts plane formula to thicken, and it thickens highly equal to the thickness of LED light source 701；And carry out frosted process in the bottom 703 of the structure 702 thickeied.
Preferably, for avoiding center illumination too high, the described plane of incidence 14 is coated with anti-reflection film.
The announcement of book and instruction according to the above description, above-mentioned embodiment can also be modified and revise by those skilled in the art in the invention.Therefore, the invention is not limited in detailed description of the invention disclosed and described above, should also be as some modifications and changes of the present invention falling in the scope of the claims of the present invention.Although additionally, employ some specific term and nouns of locality in this specification, but these terms and the noun of locality are intended merely to convenient explanation, and the present invention does not constitute any restriction.
Claims (9)
1. even optical lens, described even optical lens is revolving body, it is characterised in that: include top exit facet, sidepiece exit facet, the plane of incidence and baseplane, described top exit facet and the described plane of incidence and be the inner concave shape structure of the rotationally symmetrical axial symmetry along even optical lens；On the cross section of rotation axes of symmetry,
Described top exit facet includes extending curve and parabola；
Described sidepiece exit facet includes straightway and arc；
The described plane of incidence includes the top curve curve, the first step curve, the second step curve and the lateral curve that are sequentially connected with；
The starting point of described extension curve is positioned on described rotation axes of symmetry, maximum slope herein, and the end of described extension curve intersects with described parabola, and slope is minimum herein；Extend the starting slope of curve more than 1.
2. even optical lens according to claim 1, it is characterised in that: described baseplane is frosting.
3. even optical lens according to claim 2, it is characterised in that: described parabola is connected with described straightway, and the upper area of described straightway is frosting, the height 0.5mm of described frosting.
4. even optical lens according to claim 1, it is characterised in that: the distance between described straightway and rotation axes of symmetry becomes larger along top-down direction, and the distance between described arc and rotation axes of symmetry becomes larger along top-down direction.
5. even optical lens according to claim 1, it is characterized in that: described top curve curve is the middle part curve that two sideleads are gradually increased respectively gently, the slope of described first step curve is along being gradually reduced away from described rotationally symmetrical direction of principal axis, and it is in smoothing junction with described top curve curve and described second step curve respectively, described second step curve is smoothed curve, and described lateral curve includes straightway and outwards launches gradually and curved section that slope is gradually reduced.
6. even optical lens according to claim 5, it is characterised in that: the angle of intersection of described lateral curve and described second step curve range for 90 degree to 95 degree, connect the radius 0.1mm of the transition chamfering of described second step curve and described lateral curve.
7. even optical lens according to claim 1, it is characterised in that: the described plane of incidence is coated with anti-reflection film.
8. include the LED light source module of even optical lens described in any one of claim 1-7, it is characterised in that: also including reflecting paper and substrate, described reflecting paper is adhered on described substrate；Described LED light source is SMD light source, and the exiting surface of LED light source is circular flat, and described exiting surface flushes with the baseplane of even optical lens, and described LED light source is arranged on the substrate；The baseplane of even optical lens is provided with multiple fixing foot, and the plurality of fixing foot is by sticky stuff and described substrate bonding.
9. LED light source module according to claim 8, it is characterised in that: the baseplane of described even optical lens adopts the structure that plane formula thickeies, and it thickens highly equal to the thickness of LED light source.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410117760.0A CN103925557B (en) | 2014-03-26 | 2014-03-26 | Even optical lens and include the LED light source module of this even optical lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410117760.0A CN103925557B (en) | 2014-03-26 | 2014-03-26 | Even optical lens and include the LED light source module of this even optical lens |
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| Publication Number | Publication Date |
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| CN103925557A CN103925557A (en) | 2014-07-16 |
| CN103925557B true CN103925557B (en) | 2016-06-29 |
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| CN201410117760.0A Expired - Fee Related CN103925557B (en) | 2014-03-26 | 2014-03-26 | Even optical lens and include the LED light source module of this even optical lens |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150009860A (en) | 2013-07-17 | 2015-01-27 | 서울반도체 주식회사 | Light diffusing lens and light emitting device having the same |
| WO2016010214A1 (en) * | 2014-07-17 | 2016-01-21 | 서울반도체 주식회사 | Light diffusing lens and light emitting device having same |
| WO2017088100A1 (en) * | 2015-11-23 | 2017-06-01 | 成都派斯光学有限公司 | Short-range light mixer |
| CN108826228A (en) * | 2018-06-27 | 2018-11-16 | 赛尔富电子有限公司 | A kind of illuminating lens and lighting unit and lighting system |
| CN108732823B (en) * | 2018-08-03 | 2023-08-08 | 广东烨嘉光电科技股份有限公司 | Backlight system of head-up display device |
| CN110966525B (en) * | 2019-12-20 | 2024-03-19 | 广东晶科电子股份有限公司 | Lens and light-emitting device |
| CN113805383A (en) * | 2021-08-27 | 2021-12-17 | 广东烨嘉光电科技股份有限公司 | Fidelity type backlight system for wide color gamut display and light distribution method thereof |
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| CN103277739A (en) * | 2013-04-26 | 2013-09-04 | 易美芯光（北京）科技有限公司 | Optical lens |
| CN103471009A (en) * | 2013-09-13 | 2013-12-25 | 东莞市欧科光电科技有限公司 | Novel LED lens and liquid crystal display backlight screen |
| CN103543481A (en) * | 2013-11-06 | 2014-01-29 | 苏州东显光电科技有限公司 | Reflection-type second lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP5656461B2 (en) * | 2010-06-14 | 2015-01-21 | 日東光学株式会社 | Light emitting device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103277739A (en) * | 2013-04-26 | 2013-09-04 | 易美芯光（北京）科技有限公司 | Optical lens |
| CN103471009A (en) * | 2013-09-13 | 2013-12-25 | 东莞市欧科光电科技有限公司 | Novel LED lens and liquid crystal display backlight screen |
| CN103543481A (en) * | 2013-11-06 | 2014-01-29 | 苏州东显光电科技有限公司 | Reflection-type second lens |
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