CN102287715A - Large-area uniform surface light source device - Google Patents
Large-area uniform surface light source device Download PDFInfo
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- CN102287715A CN102287715A CN2011102431412A CN201110243141A CN102287715A CN 102287715 A CN102287715 A CN 102287715A CN 2011102431412 A CN2011102431412 A CN 2011102431412A CN 201110243141 A CN201110243141 A CN 201110243141A CN 102287715 A CN102287715 A CN 102287715A
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Abstract
The invention discloses a large-area uniform surface light source device which comprises four or two LED linear array light sources, a large-area diffusion-scattering plate and a large-area body diffusion plate. The large-area diffusion-scattering plate is mutually parallel to the large-area body diffusion plate, and an air interval layer is arranged between the parallel large-area diffusion-scattering plate and large-area body diffusion plate; and the four or two LED linear array light sources are respectively arranged on two side surfaces opposite each other, or two opposite side surfaces of the large-area diffusion-scattering plate. The LED linear array light sources illuminate the large-area diffusion-scattering plate from the side surface of the air interval layer in a grazing incidence manner to form large-area light source radiation, and the surface light source radiation is outputted through the large-area body diffusion plate in a scattering/diffusion manner again, thus an output surface light source is homogenized, and the high-uniformity large-area surface light source output can be obtained.
Description
Technical field
The present invention relates to area source and specifically be meant a kind of planar light source device with high radiance, high uniformity, overlarge area.
Background technology
Uniform area light source is used because of having extremely widely, is the heat subject of light source technology research always.Existing at present a lot of relevant article report, even patent and product.
The formation of area source, the simplest method are the integrating sphere methods, use one or more light source input integral balls, after the spheroid inner surface repeatedly reflects, from the aperture or the small size opening output light on integrating sphere surface.The most typical representative is that the Lan Fei Optical Co., Ltd (Lab sphere) under the bold and generous group of Britain is celebrated to make, to produce integrating sphere, has researched and developed multiple integrating sphere uniform source of light product.Because integrating sphere output window size is subjected to the restriction of sphere diameter, can not make the even output face light source of large tracts of land; Light loss consumption because of integrating sphere is very big simultaneously, and its output light intensity is subjected to great restriction.
The most practical at present area source is to use the backlight that all kinds optical plates (LGP) marginal ray technology (Side Light) are made, and has been widely used in LCDs (LCD), as LCD TV, computer LCDs, mobile phone etc.But the backlight technology can only be applied to display device.
Also form single little area source optical system in recent years, again these single optical systems are assembled into bigger area sources by patent report application led module and several optical element.The complexity of its structure and technology, the limitation of technology can not realize having the area source of high radiance, high uniformity, overlarge area equally.
Summary of the invention
Defective based on above-mentioned prior art exists the objective of the invention is to propose a kind of have high radiance, overlarge area uniform area light source device.
Large tracts of land uniform area light source device of the present invention comprises: LED array light source, large tracts of land diffuse scattering plate and large tracts of land body diffuser plate.Large tracts of land diffuse scattering plate and large tracts of land body diffuser plate are parallel to each other, and are the airspace layer between the parallel plane, and the spacing of airspace layer is the height of light-focusing type LED linear array device.The LED array light source is four or two, lays respectively at two sides facing each other or two two relative sides of large tracts of land diffuse scattering plate.The linear array orientation of LED array light source is parallel to the airspace layer.
Described large tracts of land diffuse scattering plate constitutes by spray polytetrafluoroethylene (PTFE) (F4) coating on large-area substrates.
Described large tracts of land body diffuser plate is to be base material by high permeability Merlon/poly methyl methacrylate plastic (PC/PMMA), before the base material polymerization forming, mixes that scattering particles that size is equal to or greater than visible wavelength forms.
Described LED array light source is installed a cylindrical lens before by each LED device in the LED array light source and is formed, the bus of cylindrical lens perpendicular to the optical axis of LED output beam, be parallel to large tracts of land diffuse scattering board plane, the distance of cylindrical lens and LED device remains on the LED output beam is collimated along optical axis direction.
The LED output beam is transformed to the light beam of the circular light distribution of flat Elliptical along the compression of cylindrical lens generatrix direction, and this light beam is dispersed board plane from two sides facing each other or two two relative side glancing incidence illumination large tracts of land of large tracts of land diffuse scattering plate; By the fine setting grazing angle, the whole large tracts of land diffuse scattering board plane that throws light on forms the large tracts of land area source radiation with diffuse scattering characteristic.This is a kind of smooth glancing incidence forms area source in diffuse surface a physical process.This area source radiation sees through large tracts of land body diffuser plate, once more because of scattering/diffusion output, thereby further makes output face light source homogenising again again, thereby obtains to have the large tracts of land area source output of high uniformity.
Advantage of the present invention is:
1. structure of optical means is simple, and manufacturing process is easy, uses the present invention and makes principle and method, can make the area source of practical large tracts of land, the output of high luminous power, the output of high uniformity lambert's radiation characteristic.
2. according to manufacturing principle of the present invention and method, application has the light-focusing type LED linear array of different spectral radiance as the input light source, can obtain the large tracts of land light output of required spatial distribution, can make solar simulator and polytype area source of novel overlarge area, be applied to test, the calibration of optics, instrument, product, also can make the backlight of super brightness output.
Description of drawings
Fig. 1 is the structural representation of large tracts of land uniform area light source device;
Fig. 2 is the action diagram of flat ellipse light distribution light beam for cylindrical lens makes the LED optical beam transformation;
Fig. 3 is a linear array LED flat ellipse light beam schematic diagram.
The specific embodiment
Below in conjunction with drawings and Examples the specific embodiment of the present invention is described in further detail:
Fig. 1 is the structural representation of large tracts of land uniform area light source device of the present invention, and this device is made of LED array light source 1, large tracts of land diffuse scattering plate 5 and large tracts of land body diffuser plate 3 parts.Large tracts of land diffuse scattering plate and large tracts of land body diffuser plate are parallel to each other, and are airspace layer 4 between the parallel plane, and the spacing of airspace layer is the height of LED linear array device.The LED array light source can be four, perhaps two, if two, then be installed in two relative sides of large tracts of land diffuse scattering plate 5, make the irradiation zone mutual superposition of two side LED light beams on large tracts of land diffuse scattering board plane, improve the homogenising degree of LED irradiation level on the scatter plate plane greatly.For strengthening the radiance light output of uniform area light source device, 4 LED array light sources can be installed, be installed in four sides of large tracts of land diffuse scattering plate respectively, install symmetrically.
Large tracts of land diffuse scattering plate 5 constitutes by spray polytetrafluoroethylene (PTFE) (F4) coating on large-area substrates, and substrate requires good rigidly, and the surface is an optical flat, and the spraying rear surface requires the scattering surface for desirable lambert's diffusive property of high scattering efficiency, low scattering loss.
Large tracts of land body diffuser plate 3 is to use that to have high permeability PC/PMMA be optical element, before the base material polymerization forming, participates in that scattering particles makes.This diffuser plate is the scatter plate with whole scattering mechanism, promptly all plays scattering process in the surface of diffuser plate and the body, and wherein effective light scattering coefficient of scattering particles can reach more than 78%.Volume scattering type scatter plate has overcome the weakness of area scattering, has high light scattering, has both the transparency preferably simultaneously, and scatter plate has light transmission rate and the 90% above mist degree more than 80%, makes light output realize soft, even.
LED array light source 1 is installed a cylindrical lens 2 by each LED device front of LED array light source 1 and is formed, and the bus that makes cylindrical lens perpendicular to LED output beam optical axis, be parallel to large tracts of land diffuse scattering board plane.
The forming process of the large tracts of land uniform beam of apparatus of the present invention:
Adjust the distance of cylindrical lens 2 and LED device 1, the LED output beam is collimated along optical axis direction.Fig. 2 illustrates that it is the effect that the cross section is flat ellipse light distribution light beam that cylindrical lens makes light-focusing type LED optical beam transformation.The light that led light source 1 sends, through cylindrical lens 2, the light beam that the LED orientation is dispersed is assembled collimation in the optical axial plane vertical with the cylindrical lens bus; Because the asymmetry of cylindrical lens, the focusing rate of LED emission light beam in the cross section parallel with the cylindrical lens bus is zero, the angle of divergence of LED emission light beam does not change, so the light beam A of LED output circular symmetry among Fig. 2, light beam A is transformed to flat ellipse light beam B through secondary optics cylindrical lens 2; A1 represents the half-power zone of light distribution in the LED output beam; B1 represents the half-power zone of flat ellipse light beam B light distribution.
Fig. 3 is a linear array LED Bian Elliptical circle beam profile schematic diagram.Adjust the spacing of adjacent devices among the linear array LED, make the outer peripheral areas of half-power output area B1 of each adjacent LED illuminating bundle light intensity on the large tracts of land diffuse scattering board plane overlapped, improve the even voltinism of LED irradiation level on the scatter plate plane.
The LED array light source is dispersed board plane through cylindrical lens 2 transmissions output light from two side glancing incidence illumination large tracts of land of large tracts of land diffuse scattering plate, the fine setting grazing angle, make the whole large tracts of land diffuse scattering of output optical illumination board plane, form large tracts of land area source radiation with diffuse scattering characteristic.This is a kind of smooth glancing incidence forms area source in diffuse surface a physical process.Control the forward current of each device of LED linear array simultaneously, make the irradiation level further homogenising of LED on large tracts of land scatter plate plane.This area source radiation sees through large tracts of land body diffuser plate, once more because of scattering/diffusion output, thereby further makes output face light source homogenising again again, thereby obtains to have the large tracts of land area source output of high uniformity.
Claims (4)
1. large tracts of land uniform area light source device, comprising: LED array light source (1), large tracts of land diffuse scattering plate (5) and large tracts of land body diffuser plate (3) is characterized in that:
Large tracts of land diffuse scattering plate and large tracts of land body diffuser plate are parallel to each other, and are airspace layer (4) between the parallel plane, and the spacing of airspace layer is the height of light-focusing type LED linear array device; The LED array light source is four or two, lays respectively at two sides facing each other or two two relative sides of large tracts of land diffuse scattering plate; The linear array orientation of LED array light source is parallel to the airspace layer;
The LED output beam compresses along the cylindrical lens generatrix direction, be transformed to the light beam of the circular light distribution of flat Elliptical, this light beam is from two sides facing each other of airspace layer or two two relative side glancing incidences whole large tracts of land diffuse scattering board plane that throws light on, formation has the large tracts of land area source radiation of diffuse scattering characteristic, this area source radiation sees through large tracts of land body diffuser plate, once more because of scattering/diffusion output, thereby further make output face light source homogenising again again, thereby obtain to have the large tracts of land area source output of high uniformity.
2. according to a kind of large tracts of land uniform area light source device of claim 1, it is characterized in that: described large tracts of land diffuse scattering plate is made of spraying teflon coating on large-area substrates.
3. according to a kind of large tracts of land uniform area light source device of claim 1, it is characterized in that: described large tracts of land body diffuser plate is to be base material by high permeability PC/PMMA, before the base material polymerization forming, mix that scattering particles that size is equal to or greater than visible wavelength forms.
4. according to a kind of large tracts of land uniform area light source device of claim 1, it is characterized in that: described LED array light source is installed a cylindrical lens before by each LED device in the LED array light source and is formed, the bus of cylindrical lens perpendicular to the optical axis of LED output beam, be parallel to large tracts of land diffuse scattering board plane, the distance of cylindrical lens and LED device remains on the LED output beam is collimated along optical axis direction.
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| CN201110243141.2A CN102287715B (en) | 2011-08-23 | 2011-08-23 | Large-area uniform surface light source device |
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| CN201110243141.2A CN102287715B (en) | 2011-08-23 | 2011-08-23 | Large-area uniform surface light source device |
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| CN103278448A (en) * | 2013-05-10 | 2013-09-04 | 浙江大学 | Illumination device for improving fruit line scanning spectral imaging |
| CN103336387A (en) * | 2013-07-05 | 2013-10-02 | 深圳市华星光电技术有限公司 | Edge-light backlight and liquid crystal display provided with same |
| CN105090780A (en) * | 2015-07-12 | 2015-11-25 | 李�远 | Large-area collimated light source |
| US9322975B2 (en) | 2013-07-05 | 2016-04-26 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Side-lighting backlight and liquid crystal display comprising the same |
| CN106641867A (en) * | 2016-10-31 | 2017-05-10 | 华侨大学 | Natural light type LED panel lamp |
| CN108709497A (en) * | 2018-04-11 | 2018-10-26 | 中国铁道科学研究院 | A kind of contact net geometric parameter detection device |
| CN110030505A (en) * | 2019-03-22 | 2019-07-19 | 厦门立达信照明有限公司 | A kind of mask lamp of light guiding lens and lampshade brightness uniformity |
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| CN101561521A (en) * | 2008-04-15 | 2009-10-21 | 索尼株式会社 | Lens array sheet, light source and liquid crystal display device |
| CN101681053A (en) * | 2007-05-20 | 2010-03-24 | 3M创新有限公司 | recycling backlights with semi-specular components |
| CN101681056A (en) * | 2007-05-20 | 2010-03-24 | 3M创新有限公司 | Hollow light torus escope backlight |
| TW201027192A (en) * | 2008-10-27 | 2010-07-16 | 3M Innovative Properties Co | Semispecular hollow backlight with gradient extraction |
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| CN1683974A (en) * | 2004-04-16 | 2005-10-19 | 大日本印刷株式会社 | Diffusion plate, surface light source device and transmission type display device |
| CN101210657A (en) * | 2006-12-28 | 2008-07-02 | 宏塑工业股份有限公司 | Linear lighting device |
| CN101681053A (en) * | 2007-05-20 | 2010-03-24 | 3M创新有限公司 | recycling backlights with semi-specular components |
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| CN101561521A (en) * | 2008-04-15 | 2009-10-21 | 索尼株式会社 | Lens array sheet, light source and liquid crystal display device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103278448A (en) * | 2013-05-10 | 2013-09-04 | 浙江大学 | Illumination device for improving fruit line scanning spectral imaging |
| CN103278448B (en) * | 2013-05-10 | 2015-04-29 | 浙江大学 | Illumination device for improving fruit line scanning spectral imaging |
| CN103336387A (en) * | 2013-07-05 | 2013-10-02 | 深圳市华星光电技术有限公司 | Edge-light backlight and liquid crystal display provided with same |
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| CN103336387B (en) * | 2013-07-05 | 2015-12-02 | 深圳市华星光电技术有限公司 | Side-light type back light and there is the liquid crystal display of this backlight |
| US9322975B2 (en) | 2013-07-05 | 2016-04-26 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Side-lighting backlight and liquid crystal display comprising the same |
| CN105090780A (en) * | 2015-07-12 | 2015-11-25 | 李�远 | Large-area collimated light source |
| CN106641867A (en) * | 2016-10-31 | 2017-05-10 | 华侨大学 | Natural light type LED panel lamp |
| CN108709497A (en) * | 2018-04-11 | 2018-10-26 | 中国铁道科学研究院 | A kind of contact net geometric parameter detection device |
| CN108709497B (en) * | 2018-04-11 | 2024-04-12 | 中国铁道科学研究院集团有限公司 | Contact net geometric parameters detection device |
| CN110030505A (en) * | 2019-03-22 | 2019-07-19 | 厦门立达信照明有限公司 | A kind of mask lamp of light guiding lens and lampshade brightness uniformity |
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| CN102287715B (en) | 2014-02-19 |
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