SG85990G - Fresnel lens for projection screens - Google Patents

Fresnel lens for projection screens

Info

Publication number
SG85990G
SG85990G SG859/90A SG85990A SG85990G SG 85990 G SG85990 G SG 85990G SG 859/90 A SG859/90 A SG 859/90A SG 85990 A SG85990 A SG 85990A SG 85990 G SG85990 G SG 85990G
Authority
SG
Singapore
Prior art keywords
fresnel lens
projection screens
screens
projection
fresnel
Prior art date
Application number
SG859/90A
Other languages
English (en)
Original Assignee
Philips Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Nv filed Critical Philips Nv
Publication of SG85990G publication Critical patent/SG85990G/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/72—Modifying the appearance of television pictures by optical filters or diffusing screens
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/60—Projection screens characterised by the nature of the surface
    • G03B21/62—Translucent screens
    • G03B21/625—Lenticular translucent screens

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Lenses (AREA)
SG859/90A 1985-11-20 1990-10-24 Fresnel lens for projection screens SG85990G (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/800,012 US4824227A (en) 1985-11-20 1985-11-20 Optimum riser angle for fresnel lenses in projection screens

Publications (1)

Publication Number Publication Date
SG85990G true SG85990G (en) 1991-01-04

Family

ID=25177299

Family Applications (1)

Application Number Title Priority Date Filing Date
SG859/90A SG85990G (en) 1985-11-20 1990-10-24 Fresnel lens for projection screens

Country Status (8)

Country Link
US (1) US4824227A (da)
EP (1) EP0223310B1 (da)
JP (1) JPH07121131B2 (da)
KR (1) KR940011595B1 (da)
CA (1) CA1268065A (da)
DE (1) DE3669056D1 (da)
DK (1) DK174671B1 (da)
SG (1) SG85990G (da)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3883181T2 (de) * 1987-12-14 1993-12-02 Ichiko Industries Ltd Verfahren zum Herstellen einer prismatischen Linse vom Fresnel-Typ.
JP2686536B2 (ja) * 1988-05-20 1997-12-08 パイオニア株式会社 ファイバー型光波長変換装置
KR950015238A (ko) * 1993-11-05 1995-06-16 배순훈 포커스 에러 검출장치
JPH10282310A (ja) * 1997-04-11 1998-10-23 Dainippon Printing Co Ltd フレネルレンズシート及び透過型スクリーン
US6807020B2 (en) 2002-08-01 2004-10-19 Jenmar Visual Systems Lens optimization and color correction for image projection systems
US6700713B2 (en) * 2002-08-01 2004-03-02 Jenmar Visual Systems Lens optimization for image projection systems
US6867928B2 (en) * 2002-08-01 2005-03-15 Jenmar Visual Systems Method and apparatus for correcting visual aberrations in image projection systems
FR2855273A1 (fr) * 2003-05-20 2004-11-26 Thomson Licensing Sa Lentille de fresnel a eclairer sous incidence elevee
US20050041307A1 (en) * 2003-07-22 2005-02-24 Stephen Barone Directed Fresnel lenses
JP4967247B2 (ja) * 2004-11-01 2012-07-04 株式会社日立製作所 画像表示装置及びそれに用いるスクリーン
US7735998B2 (en) 2006-10-25 2010-06-15 Volk Donald A Multi-layered multifocal lens with blended refractive index
US7740354B2 (en) 2006-10-25 2010-06-22 Volk Donald A Multi-layered gradient index progressive lens
FR2995408B1 (fr) * 2012-09-10 2016-11-18 Soitec Solar Gmbh Lentille de fresnel avec angle de depouille variable
EP4235230A1 (en) * 2016-09-13 2023-08-30 Facebook Technologies, LLC Fresnel lens with dynamic draft for reduced optical artifacts
CN110161597B (zh) 2018-02-12 2021-11-16 玉晶光电(厦门)有限公司 菲涅耳透镜
TWI651549B (zh) * 2018-02-12 2019-02-21 玉晶光電股份有限公司 菲涅耳透鏡

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2200646A (en) * 1938-02-28 1940-05-14 John D Strong Transparent projection screen
DE2519617A1 (de) * 1975-05-02 1976-11-11 Agfa Gevaert Ag Projektionsschirm
US4457594A (en) * 1980-09-08 1984-07-03 B Optical Fresnel lens projection system with high gain screen
US4391495A (en) * 1981-06-02 1983-07-05 The Austin Company Image display system
US4398810A (en) * 1982-02-18 1983-08-16 B Optical Fresnel lens system
JPS59140434A (ja) * 1982-10-08 1984-08-11 Mitsubishi Rayon Co Ltd 背面投影スクリ−ン

Also Published As

Publication number Publication date
DK547986D0 (da) 1986-11-17
CA1268065A (en) 1990-04-24
DK174671B1 (da) 2003-08-25
US4824227A (en) 1989-04-25
JPH07121131B2 (ja) 1995-12-20
DK547986A (da) 1987-05-21
KR870005550A (ko) 1987-06-09
DE3669056D1 (de) 1990-03-22
KR940011595B1 (ko) 1994-12-22
EP0223310B1 (en) 1990-02-14
JPS62175087A (ja) 1987-07-31
EP0223310A2 (en) 1987-05-27
EP0223310A3 (en) 1987-10-28

Similar Documents

Publication Publication Date Title
GB2168470B (en) Light projector
GB2124397B (en) Optical projection
EP0223310A3 (en) Fresnel lens for projection screens
GB8430806D0 (en) Projection optical device
EP0067280A3 (en) Projection screen
GB8521305D0 (en) Optical projectors
GB2237122B (en) Improved fresnel lens
DE3572042D1 (en) Projection lens system
EP0361559A3 (en) Image projection arrangement
GB2138163B (en) Optical projection system
GB2108705B (en) Lighting unit for projectors
GB8403403D0 (en) Optical projector
DE3572405D1 (en) Projection lens system
DE3477719D1 (en) Video projector
GB8503169D0 (en) Telecine projector
DE3465509D1 (en) Projection lamp unit
SG85490G (en) Projection screen
GB8514717D0 (en) Projection screen
GB2133577B (en) Projection screen
AU1497883A (en) A fresnel lens
GB2207497B (en) Light projector
GB2152233B (en) Projector
GB2163246B (en) Lighting projector
GB8304443D0 (en) Optical projection system
GB2122362B (en) Optical image projector