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BR8400003A - Retroprojetor - Google Patents

Retroprojetor

Info

Publication number
BR8400003A
BR8400003A BR8400003A BR8400003A BR8400003A BR 8400003 A BR8400003 A BR 8400003A BR 8400003 A BR8400003 A BR 8400003A BR 8400003 A BR8400003 A BR 8400003A BR 8400003 A BR8400003 A BR 8400003A
Authority
BR
Brazil
Prior art keywords
retroprojector
Prior art date
Application number
BR8400003A
Other languages
English (en)
Inventor
Dennis F Vanderwerf
Original Assignee
Minnesota Mining & Mfg
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 Minnesota Mining & Mfg filed Critical Minnesota Mining & Mfg
Publication of BR8400003A publication Critical patent/BR8400003A/pt

Links

Classifications

    • 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
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S353/00—Optics: image projectors
    • Y10S353/03—Transparent

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
BR8400003A 1983-01-03 1984-01-02 Retroprojetor BR8400003A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/455,424 US4436392A (en) 1983-01-03 1983-01-03 Distortion correction for an overhead projector system

Publications (1)

Publication Number Publication Date
BR8400003A true BR8400003A (pt) 1984-07-31

Family

ID=23808746

Family Applications (1)

Application Number Title Priority Date Filing Date
BR8400003A BR8400003A (pt) 1983-01-03 1984-01-02 Retroprojetor

Country Status (6)

Country Link
US (1) US4436392A (pt)
EP (1) EP0115900B1 (pt)
JP (2) JPS59136725A (pt)
BR (1) BR8400003A (pt)
CA (1) CA1240862A (pt)
DE (1) DE3467427D1 (pt)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3519506A1 (de) * 1985-05-31 1986-12-04 Demolux Gmbh & Co Kg, 6070 Langen Overhead-projektor
JPH0623817B2 (ja) * 1985-07-18 1994-03-30 旭光学工業株式会社 液晶投写型画像表示装置
DE3622471A1 (de) * 1986-07-04 1988-01-14 Demolux Overhead-projektor
US4741613A (en) * 1986-12-19 1988-05-03 Minnesota Mining And Manufacturing Company Reduced height transmissive overhead projector
BR8707960A (pt) * 1987-01-22 1990-02-13 Nova Onab Optica Ab Aparelho projetor
US5032022A (en) * 1988-09-14 1991-07-16 Casio Computer Co., Ltd. Projector
US5220363A (en) * 1988-09-14 1993-06-15 Casio Computer Co., Ltd. Projector
US5422691A (en) * 1991-03-15 1995-06-06 Seiko Epson Corporation Projection type displaying apparatus and illumination system
US5092672A (en) * 1991-06-07 1992-03-03 Minnesota Mining And Manufacturing Company Condenser lens system for overhead projector
FR2678746B1 (fr) * 1991-07-05 1993-11-05 Sextant Avionique Systeme de projection d'image a directivite ajustable.
JP3320862B2 (ja) * 1992-11-26 2002-09-03 旭光学工業株式会社 投影光学系の瞳共役結合装置
US5325218A (en) * 1992-12-31 1994-06-28 Minnesota Mining And Manufacturing Company Cholesteric polarizer for liquid crystal display and overhead projector
US5400094A (en) * 1993-03-31 1995-03-21 Minnesota Mining And Manufacturing Company Condensers for overhead projectors
US5317349A (en) * 1993-06-29 1994-05-31 Minnesota Mining And Manufacturing Company Overhead projector with achromatic fresnel lens
US5548357A (en) * 1995-06-06 1996-08-20 Xerox Corporation Keystoning and focus correction for an overhead projector
DE19733370C2 (de) * 1997-08-01 2000-07-06 Agfa Gevaert Ag Vorrichtung und Verfahren zum Kopieren von Bilder auf lichtempfindliches Aufzeichnungsmaterial
DE19737107C2 (de) * 1997-08-26 2001-02-08 Fresnel Optics Gmbh Optische Anordnung bestehend aus mindestens zwei Fresnellinsen und Projektions- bzw. Displayvorrichtung mit dieser Anordnung
US6568814B2 (en) * 1999-03-03 2003-05-27 3M Innovative Properties Company Integrated front projection system with shaped imager and associated method
US6416185B1 (en) * 1999-06-30 2002-07-09 Intel Corporation Managing differential focus in projection displays
KR20030009860A (ko) * 2001-07-24 2003-02-05 주식회사 토펙스 광학장치
US9715117B2 (en) * 2012-10-31 2017-07-25 G. B. Kirby Meacham Autostereoscopic three dimensional display
US11885738B1 (en) 2013-01-22 2024-01-30 J.A. Woollam Co., Inc. Reflectometer, spectrophotometer, ellipsometer or polarimeter system including sample imaging system that simultaneously meet the scheimpflug condition and overcomes keystone error
US9983402B1 (en) 2017-02-16 2018-05-29 Christie Digital Systems Usa, Inc. Forward-on-forward high dynamic range architecture for digital micromirror devices

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3064523A (en) 1960-02-24 1962-11-20 Bausch & Lomb Illuminating arrangement for optical devices
US3511563A (en) 1967-11-14 1970-05-12 Minnesota Mining & Mfg Projector
US3547530A (en) * 1968-11-12 1970-12-15 Bell Telephone Labor Inc Overhead projector
JPS51933Y1 (pt) * 1969-06-17 1976-01-12
US3637308A (en) 1970-06-11 1972-01-25 Rca Corp Color correction of prismatic off-axis optical system
US4002408A (en) 1971-10-14 1977-01-11 Gakken Co. Ltd. System and device for overhead projection
DE2317830C3 (de) * 1973-04-09 1980-06-19 Ernst Leitz Wetzlar Gmbh, 6300 Lahn- Wetzlar Durchlicht-Schreibprojektor
JPS5116755U (pt) * 1974-07-24 1976-02-06
US4118114A (en) 1974-08-21 1978-10-03 Minnesota Mining And Manufacturing Company Low-glare overhead projector
JPS5262434A (en) 1975-11-18 1977-05-23 Fuji Photo Film Co Ltd Image distortion correction device for projector
DE2828245A1 (de) * 1978-06-28 1980-01-03 Rainer Wolfgang Landsee Projektor
US4204881A (en) 1978-10-02 1980-05-27 Mcgrew Stephen P Solar power system
JPS5557840A (en) * 1978-10-24 1980-04-30 Gakken Co Ltd Overhead projector capable of projecting on vertical plane

Also Published As

Publication number Publication date
US4436392A (en) 1984-03-13
JPH058554U (ja) 1993-02-05
EP0115900B1 (en) 1987-11-11
CA1240862A (en) 1988-08-23
DE3467427D1 (en) 1987-12-17
EP0115900A1 (en) 1984-08-15
JPS59136725A (ja) 1984-08-06
JP2553426Y2 (ja) 1997-11-05

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Legal Events

Date Code Title Description
MM Lapse due to non-payment of fees (art. 50)