CN102478675A - Curved-surface pyramidal micro-lens array and rear projection screen with the lens array - Google Patents
Curved-surface pyramidal micro-lens array and rear projection screen with the lens array Download PDFInfo
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- CN102478675A CN102478675A CN2010105673391A CN201010567339A CN102478675A CN 102478675 A CN102478675 A CN 102478675A CN 2010105673391 A CN2010105673391 A CN 2010105673391A CN 201010567339 A CN201010567339 A CN 201010567339A CN 102478675 A CN102478675 A CN 102478675A
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Abstract
The invention relates to a rear projection optics screen and especially relates to a curved-surface pyramidal micro-lens array and a rear projection screen with the lens array used in a rear projection screen. The curved-surface pyramidal micro-lens array is an array structure formed by a plurality of curved-surface pyramidal micro-lens units. The each curved-surface pyramidal micro-lens unit possesses a bottom surface, a top surface and four side surfaces which connect the bottom surface and the top surface. The bottom surface of the curved-surface pyramidal micro-lens unit is a square, the top surface is a spherical surface and the side surfaces are cambered surface. The rear projection screen comprises: a Fresnel screen, the curved-surface pyramidal micro-lens array and a scattering layer with a fine hair surface. The bottom surfaces of the curved-surface pyramidal micro-lens units are connected with the Fresnel screen. The top surfaces are connected with the scattering layer with the fine hair surface. A black coating is coated between the adjacent curved-surface pyramidal micro-lens units. The array and the rear projection screen possess the following advantages: high transmittance, a high contrast ratio, high resolution, an anti-glare characteristic and a large angle of field of view.
Description
Technical field
The present invention relates to the rear-projection optical screen, the curved surface pyramid microlens array that specifically a kind of rear projection screen uses and have the rear projection screen of this lens arra.
Background technology
The rear-projection optical screen is widely used in occasions such as large conference room, command and control center, training education, video conference, the displaying Room, exhibition center, auditorium, gymnasium, music hall, supermarket, airport, station, harbour, cafeteria, show window at present; Even the strong complex environment of various surround lightings, this just has higher requirement to optical screen.
Optical screen is meant the projection screen that contains one or more optical lens systems, and rear projection screen normally is made up of Fresnel Lenses and diffuse reflection screen.The light of ray machine outgoing becomes directional light after shielding through Fresnel, shields light scatter through diffuse reflection, thereby reaches the purpose that big visual field is watched.Now, mostly main on the market diffuse reflection screen is that simple diffuse reflection screen, cylindrical mirror shield and the form of beaded screen.
Simple diffuse reflection screen mainly is directly the acrylic surface to be handled to be made.Fresnel Lenses is with after simple diffuse reflection screen cooperates, and will produce very serious glare phenomenon from the parasitic light of Fresnel Lenses outgoing.
The cylindrical lens component structure of cylindrical mirror screen is as shown in Figure 1; Incident light passes through the column convex lens focus of the plane of incidence near the column convex lens of exit facet; The zone line of adjacent column convex lens forms bossing on exit facet; At bossing printing black streaking 1, can guarantee that like this exit facet one side has the blacking of maximum area, thereby improve contrast.But because cylindrical mirror can only be with the divergence of beam of horizontal direction, and the light ray propagation direction of vertical direction is constant, and this has just caused the cylindrical mirror screen very little in the angle of divergence of vertical direction, can not be applied in the omnibearing occasion of watching of wide-angle.
The structure of beaded screen is as shown in Figure 2, between Fresnel screen 2 and diffuse reflection screen 3, uses tiny bead 4, and at the side spraying last layer black coating 5 of bead 4 towards the beholder.Bead 4 can shield the 2 refraction directional lights of coming with Fresnel to be dispersed, and is sent to the beholder.The surround lighting that impinges upon on the screen is then directly sponged by black coating 5.But because the part between the bead has black coating 5, this will cause at least 21.5% optical energy loss, and will be as shown in Figure 3, so there is certain defective in beaded screen aspect light-use.
Summary of the invention
In order to solve the problems referred to above that existing diffuse reflection screen exists, the object of the present invention is to provide a kind of curved surface pyramid microlens array and have the rear projection screen of this lens arra.
The objective of the invention is to realize through following technical scheme:
Curved surface pyramid microlens array of the present invention is formed array structure by a plurality of curved surface pyramid lenticules unit, and each curved surface pyramid lenticule unit has bottom surface, end face and connects four sides of bottom surface and end face; The bottom surface of said curved surface pyramid lenticule unit is a square, and end face is a sphere, and the side is a cambered surface.
Wherein: the outside surface of four sides of said curved surface pyramid lenticule unit is coated with total reflection film; The outside surface of the end face of curved surface pyramid lenticule unit is coated with anti-reflection film; The radius-of-curvature of side, curved surface pyramid lenticule unit is greater than 0.04mm, and the angle between the two relative side is less than 60 °; The radius-of-curvature of curved surface pyramid lenticule unit end face is greater than 0.01mm; The length of side of bottom surface, curved surface pyramid lenticule unit is 0.05mm～0.5mm.
The present invention has the rear projection screen of curved surface pyramid microlens array; Comprise Fresnel screen, curved surface pyramid microlens array and with the scattering layer of meticulous hair side; Its mean camber prismatic microlens array is formed array structure by a plurality of curved surface pyramid lenticules unit; The bottom surface of curved surface pyramid lenticule unit and Fresnel screen links to each other, and end face links to each other with scattering layer with meticulous hair side, between adjacent curved surface pyramid lenticule unit, scribbles black coating.
Wherein: said black coating is coated in the outside surface of side, curved surface pyramid lenticule unit total reflection film.
Advantage of the present invention and good effect are:
1. curved surface pyramid microlens array of the present invention utilizes light in the side of curved surface pyramid lenticule unit total reflection to take place, and penetrates from end face, can guarantee the scattering of light all angles, cylindrical mirror has the blind area in vertical direction phenomenon can not occur; Angle angle between the relative two sides, curved surface pyramid lenticule unit has guaranteed that parasitic light can outgoing, has reached the effect of anti-dazzle from face.
2. 7 bottom surfaces, curved surface pyramid lenticule unit are square, can make microlens structure compact more, have avoided optical energy loss, the optical energy loss problem of bead array can not occur.
3. the present invention is with curved surface pyramid microlens array and Fresnel Lenses combination; Being formed for LCD, LCOS, DLP is the rear projection screen of the high definition projection TV of projection source, has the advantage of high permeability, high-contrast, high resolving power, anti-dazzle, big field angle.
The present invention in the side of each curved surface pyramid lenticule unit not luminous component scribble black coating, can surround lighting be absorbed, thereby improve the contrast of screen.
Description of drawings
Fig. 1 is the structural representation of existing cylindrical lens component rear projection screen;
Fig. 2 is the structural representation of existing beaded screen;
Fig. 3 is the sectional view of existing beaded screen;
Fig. 4 is the perspective view of curved surface pyramid microlens array of the present invention;
Fig. 5 is the structural representation of Fig. 4 mean camber pyramid lenticule unit;
Fig. 6 has the structure cut-open view of the rear projection screen of curved surface pyramid microlens array for the present invention;
Wherein: 1 is black streaking, and 2 are the Fresnel screen, and 3 are the diffuse reflection screen, and 4 is bead, and 5 is black coating, and 6 is curved surface pyramid microlens array, and 7 is curved surface pyramid lenticule unit, and 8 are the scattering layer with meticulous hair side, and 9 is anti-reflection film, and 10 is total reflection film.
Embodiment
Below in conjunction with accompanying drawing the present invention is made further detailed description.
Like Fig. 4, shown in Figure 5; Curved surface pyramid microlens array 6 of the present invention is formed the line number array structure identical with columns by the identical curved surface pyramid lenticule unit 7 of a plurality of structures, and each curved surface pyramid lenticule unit 7 is whole for taper, all have bottom surface, an end face and connect four sides of bottom surface and end face; The bottom surface of curved surface pyramid lenticule unit 7 is a square, and end face is a sphere, and the side is the cambered surface with certain curvature.The situation of dispersing of the emergent ray through curved surface pyramid lenticule unit 7 is relevant with the radius of curvature R 1 of the radius of curvature R 2 of curved surface pyramid side angle (being the angle between the two relative side) α, side and end face; The α angle can influence the uniformity coefficient of emergent light; What R1 and R2 can influence emergent light disperses the uniformity coefficient and the angle of divergence; The size of the length of side L decision lenticule unit of 7 bottom surfaces, curved surface pyramid lenticule unit, thereby the resolution of decision screen.The radius of curvature R 2 of 7 sides, curved surface pyramid lenticule unit of the present invention is greater than 0.04mm, and the angle between the two relative side is less than 60 °; The radius of curvature R 1 of curved surface pyramid lenticule unit 7 end faces is greater than 0.01mm; The length of side L of 7 bottom surfaces, curved surface pyramid lenticule unit is 0.05mm～0.5mm.Outside surface in four sides of curved surface pyramid lenticule unit 7 is coated with total reflection film 10, and the outside surface of the end face of curved surface pyramid lenticule unit 7 is coated with anti-reflection film 9.Light incides the inside of curved surface pyramid lenticule unit 7 from the bottom surface, the inside surface four sides carries out total reflection, at last from the sphere outgoing of end face; Foursquare bottom surface can make microlens structure compact, has avoided optical energy loss.
As shown in Figure 6; The rear projection screen that has curved surface pyramid microlens array; Comprise Fresnel screen 2, curved surface pyramid microlens array 6 and with the scattering layer 8 of meticulous hair side; Its mean camber prismatic microlens array 6 is formed array structure by a plurality of curved surface pyramid lenticules unit 7, and the bottom surface of curved surface pyramid lenticule unit 7 and Fresnel screen 2 links to each other, and end face links to each other with scattering layer 8 with meticulous hair side; Between adjacent curved surface pyramid lenticule unit 7, scribble black coating 5; This black coating 5 is coated in the outside surface (be 7 sides, curved surface pyramid lenticule unit not luminous component scribble black coating 5) of curved surface pyramid lenticule unit 7 side total reflection films 10, and black coating can absorb surround lighting, thereby has improved the contrast of screen; The black coating of present embodiment adopts conventional material (like carbon element prepared Chinese ink or bonderite).In Fig. 6, curved surface pyramid lenticule beam projecting face is defined as the top, therefore, in the back projection process, light is by downward outgoing down; From the light of projection lens outgoing, through becoming directional light behind the Fresnel mirror 2, after the reflection of parallel rays through the side total reflection film 10 of curved surface pyramid lenticule unit 7, from the sphere outgoing of end face and disperse.If parasitic light goes into to inject curved surface pyramid lenticule unit 7 from the bottom surface, through after the reflection of side, lenticule unit, will be reflected back toward the bottom surface and can not outgoing, thereby suppress parasitic light, played the effect of anti-dazzle.
Total reflection film and anti-reflection film on the curved surface pyramid lenticule of the present invention unit 7 are prior art.Curved surface pyramid microlens array 6 of the present invention can be the individual layer screen that links together with Fresnel screen 2, also can be double-deck screen separately; Present embodiment is the individual layer screen that curved surface pyramid microlens array 6 and Fresnel screen 2 link together.
The above for the person of ordinary skill of the art, can make various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to protection scope of the present invention.
Claims (8)
1. curved surface pyramid microlens array is characterized in that: form array structure by a plurality of curved surface pyramid lenticule unit (7), each curved surface pyramid lenticule unit (7) has bottom surface, end face and connects four sides of bottom surface and end face; The bottom surface of said curved surface pyramid lenticule unit (7) is a square, and end face is a sphere, and the side is a cambered surface.
2. by the described curved surface pyramid of claim 1 microlens array, it is characterized in that: the outside surface of four sides of said curved surface pyramid lenticule unit (7) is coated with total reflection film (10).
3. by the described curved surface pyramid of claim 1 microlens array, it is characterized in that: the outside surface of the end face of said curved surface pyramid lenticule unit (7) is coated with anti-reflection film (9).
4. by the described curved surface pyramid of claim 1 microlens array, it is characterized in that: the radius-of-curvature of side, said curved surface pyramid lenticule unit (7) is greater than 0.04mm, and the angle between the two relative side is less than 60 °.
5. by the described curved surface pyramid of claim 1 microlens array, it is characterized in that: the radius-of-curvature of said curved surface pyramid lenticule unit (7) end face is greater than 0.01mm.
6. by the described curved surface pyramid of claim 1 microlens array, it is characterized in that: the length of side of bottom surface, said curved surface pyramid lenticule unit (7) is 0.05mm～0.5mm.
7. rear projection screen that has by the described curved surface pyramid of the arbitrary claim of claim 1 to 6 microlens array; It is characterized in that: comprise Fresnel screen (2), curved surface pyramid microlens array (6) and with the scattering layer (8) of meticulous hair side; Its mean camber prismatic microlens array (6) is formed array structure by a plurality of curved surface pyramid lenticule unit (7); The bottom surface of curved surface pyramid lenticule unit (7) links to each other with Fresnel screen (2); End face links to each other with scattering layer (8) with meticulous hair side, between adjacent curved surface pyramid lenticule unit (7), scribbles black coating (5).
8. by the described rear projection screen that has curved surface pyramid microlens array of claim 7, it is characterized in that: said black coating (5) is coated in the outside surface of curved surface pyramid lenticule unit (7) side total reflection film (10).
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| CN2010105673391A CN102478675A (en) | 2010-11-30 | 2010-11-30 | Curved-surface pyramidal micro-lens array and rear projection screen with the lens array |
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| CN2010105673391A CN102478675A (en) | 2010-11-30 | 2010-11-30 | Curved-surface pyramidal micro-lens array and rear projection screen with the lens array |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103574497A (en) * | 2013-11-20 | 2014-02-12 | 上海澳星照明电器制造有限公司 | Quadrangular micromirror LED traffic light optical face cover |
| CN104237980A (en) * | 2013-06-21 | 2014-12-24 | 佳能株式会社 | diffusing plate having microlens array |
| WO2017193780A1 (en) * | 2016-05-12 | 2017-11-16 | 深圳市光峰光电技术有限公司 | Manufacturing method for projection screen, and related projection screen |
| CN110520762A (en) * | 2017-04-28 | 2019-11-29 | 三菱电机株式会社 | Human body detection device and lighting device |
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| CN1135797A (en) * | 1993-11-19 | 1996-11-13 | 联合讯号公司 | Backlight assembly for an electro-optical display |
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| CN101091133A (en) * | 2004-08-10 | 2007-12-19 | 闪亮胶片有限责任公司 | Light collimating device |
| WO2009081750A1 (en) * | 2007-12-21 | 2009-07-02 | Zeon Corporation | Surface light source device |
| EP2101196A1 (en) * | 2008-03-14 | 2009-09-16 | Leuze electronic GmbH + Co KG | Optical sensor with light concentrator |
| CN201876559U (en) * | 2010-11-30 | 2011-06-22 | 杭州中科新松光电有限公司 | Curved pyramid-shaped microlens array and rear projection screen with same |
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2010
- 2010-11-30 CN CN2010105673391A patent/CN102478675A/en active Pending
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| EP0511721A2 (en) * | 1987-10-06 | 1992-11-04 | Koninklijke Philips Electronics N.V. | Front projection screen with reflected light concentrating lens array |
| US5439621A (en) * | 1993-04-12 | 1995-08-08 | Minnesota Mining And Manufacturing Company | Method of making an array of variable focal length microlenses |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237980A (en) * | 2013-06-21 | 2014-12-24 | 佳能株式会社 | diffusing plate having microlens array |
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| CN103574497A (en) * | 2013-11-20 | 2014-02-12 | 上海澳星照明电器制造有限公司 | Quadrangular micromirror LED traffic light optical face cover |
| CN103574497B (en) * | 2013-11-20 | 2017-02-01 | 上海澳星照明电器制造有限公司 | Quadrangular micromirror LED traffic light optical face cover |
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| CN110520762A (en) * | 2017-04-28 | 2019-11-29 | 三菱电机株式会社 | Human body detection device and lighting device |
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Application publication date: 20120530 |