BR8400004A - Retroprojetor - Google Patents

Retroprojetor

Info

Publication number
BR8400004A
BR8400004A BR8400004A BR8400004A BR8400004A BR 8400004 A BR8400004 A BR 8400004A BR 8400004 A BR8400004 A BR 8400004A BR 8400004 A BR8400004 A BR 8400004A BR 8400004 A BR8400004 A BR 8400004A
Authority
BR
Brazil
Prior art keywords
retroprojector
Prior art date
Application number
BR8400004A
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 BR8400004A publication Critical patent/BR8400004A/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
BR8400004A 1983-01-03 1984-01-02 Retroprojetor BR8400004A (pt)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/455,425 US4436393A (en) 1983-01-03 1983-01-03 Distortion correction for an overhead projector system

Publications (1)

Publication Number Publication Date
BR8400004A true BR8400004A (pt) 1984-07-31

Family

ID=23808752

Family Applications (1)

Application Number Title Priority Date Filing Date
BR8400004A BR8400004A (pt) 1983-01-03 1984-01-02 Retroprojetor

Country Status (7)

Country Link
US (1) US4436393A (pt)
EP (1) EP0115901B1 (pt)
JP (2) JPS59136726A (pt)
KR (2) KR890000458B1 (pt)
BR (1) BR8400004A (pt)
CA (1) CA1240542A (pt)
DE (1) DE3467428D1 (pt)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE790926A (fr) * 1971-11-05 1973-03-01 Ifoeverken Ab Dispositif en vue de raccorder le reservoir de chasse a la cuvette d'uncabinet d'aisances
US4561740A (en) * 1984-06-06 1985-12-31 Minnesota Mining And Manufacturing Company Dual-magnification rear projection lectern
EP0192023A3 (en) * 1985-02-21 1986-10-08 Casio Computer Company Limited Liquid crystal projector
US5220363A (en) * 1988-09-14 1993-06-15 Casio Computer Co., Ltd. Projector
US5032022A (en) * 1988-09-14 1991-07-16 Casio Computer Co., Ltd. Projector
US4986651A (en) * 1989-08-04 1991-01-22 Minnesota Mining And Manufacturing Company Overhead projector with centerless Fresnel lens reflective stage
JPH03209421A (ja) * 1990-01-12 1991-09-12 Victor Co Of Japan Ltd 光―光変換素子の応用装置
US5092672A (en) * 1991-06-07 1992-03-03 Minnesota Mining And Manufacturing Company Condenser lens system for overhead projector
US6141000A (en) * 1991-10-21 2000-10-31 Smart Technologies Inc. Projection display system with touch sensing on screen, computer assisted alignment correction and network conferencing
US5296882A (en) * 1992-12-21 1994-03-22 Minnesota Mining And Manufacturing Company Overhead projector with catadioptric fresnel lens
SE9300958L (sv) * 1993-03-23 1994-09-24 Nova Onab Optica Ab Offset projektor
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
US5355188A (en) * 1993-09-09 1994-10-11 In Focus Systems, Inc. Method and apparatus for distortion correction in optical projectors
US5416541A (en) * 1994-05-16 1995-05-16 Fog; Stephen C. Folding portable overhead projector
US5548357A (en) * 1995-06-06 1996-08-20 Xerox Corporation Keystoning and focus correction for an overhead projector
US5820242A (en) * 1996-03-29 1998-10-13 Minnesota Mining And Manufacturing Company Compact integrated LCD projector
US5639152A (en) * 1996-06-11 1997-06-17 Telex Communications, Inc. Collapsible LCD projector
US5722752A (en) * 1997-01-10 1998-03-03 In Focus Systems, Inc. Multimedia projection system with image quality correction
JPH1164787A (ja) * 1997-08-21 1999-03-05 Seiko Epson Corp 投写型表示装置
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
US6031608A (en) * 1998-09-03 2000-02-29 Foss Nirsystems, Inc. Spectroscopic instrument with offset grating to improve focus
GB2343526A (en) * 1998-11-04 2000-05-10 Int Optics Limited Objective arrangements for projectors
KR100333970B1 (ko) * 1999-08-31 2002-04-24 구자홍 키스톤 제거기능을 가지는 투사 표시장치
US20100006088A1 (en) * 2008-07-14 2010-01-14 Robert Owen Campbell Tracking Concentrator Employing Inverted Off-Axis Optics and Method
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

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3547530A (en) * 1968-11-12 1970-12-15 Bell Telephone Labor Inc Overhead projector
JPS51933Y1 (pt) * 1969-06-17 1976-01-12
JPS5116755U (pt) * 1974-07-24 1976-02-06
DE2828245A1 (de) * 1978-06-28 1980-01-03 Rainer Wolfgang Landsee Projektor
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
KR840007473A (ko) 1984-12-07
JP2553427Y2 (ja) 1997-11-05
KR890000458B1 (ko) 1989-03-17
EP0115901B1 (en) 1987-11-11
CA1240542A (en) 1988-08-16
US4436393A (en) 1984-03-13
JPH058555U (ja) 1993-02-05
KR890001175B1 (ko) 1989-04-26
JPS59136726A (ja) 1984-08-06
EP0115901A1 (en) 1984-08-15
DE3467428D1 (en) 1987-12-17
KR840007472A (ko) 1984-12-07

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Legal Events

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