DE3276086D1 - Method for the automatic sharpness control of images projected onto a screen, and apparatus therefor - Google Patents

Method for the automatic sharpness control of images projected onto a screen, and apparatus therefor

Info

Publication number
DE3276086D1
DE3276086D1 DE8282402301T DE3276086T DE3276086D1 DE 3276086 D1 DE3276086 D1 DE 3276086D1 DE 8282402301 T DE8282402301 T DE 8282402301T DE 3276086 T DE3276086 T DE 3276086T DE 3276086 D1 DE3276086 D1 DE 3276086D1
Authority
DE
Germany
Prior art keywords
screen
projected onto
apparatus therefor
images projected
sharpness control
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
DE8282402301T
Other languages
English (en)
Inventor
Jacques Robert Breton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Centre National dEtudes Spatiales CNES
Original Assignee
Centre National dEtudes Spatiales CNES
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 Centre National dEtudes Spatiales CNES filed Critical Centre National dEtudes Spatiales CNES
Application granted granted Critical
Publication of DE3276086D1 publication Critical patent/DE3276086D1/de
Expired legal-status Critical Current

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
    • G03B21/14—Details
    • G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Focusing (AREA)
  • Projection Apparatus (AREA)
DE8282402301T 1981-12-17 1982-12-15 Method for the automatic sharpness control of images projected onto a screen, and apparatus therefor Expired DE3276086D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8123562A FR2518767A1 (fr) 1981-12-17 1981-12-17 Procede de reglage automatique de la nettete d'images projetees sur un ecran et dispositifs pour la mise en oeuvre dudit procede

Publications (1)

Publication Number Publication Date
DE3276086D1 true DE3276086D1 (en) 1987-05-21

Family

ID=9265120

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8282402301T Expired DE3276086D1 (en) 1981-12-17 1982-12-15 Method for the automatic sharpness control of images projected onto a screen, and apparatus therefor

Country Status (3)

Country Link
EP (1) EP0083268B1 (de)
DE (1) DE3276086D1 (de)
FR (1) FR2518767A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5434632A (en) * 1993-03-22 1995-07-18 U.S. Philips Corporation Image projection apparatus with a autofocusing system
GB9705105D0 (en) 1997-03-12 1997-04-30 Brown & Sharpe Limited Optical surface measurement apparatus and methods

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL34951A (en) * 1969-07-22 1973-02-28 Gaf Corp Automatic focusing system for slide projectors and the like
AT348860B (de) * 1974-05-13 1979-03-12 Eumig Fokussiereinrichtung fuer ein projektionsobjektiv
DE2713186C2 (de) * 1977-03-25 1982-06-24 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Diaprojektor mit automatischer Scharfstellvorrichtung
GB1603596A (en) * 1977-06-06 1981-11-25 Mca Disco Vision Optical transducer and focusing system
JPS54155832A (en) * 1978-05-30 1979-12-08 Canon Inc Focusing detector

Also Published As

Publication number Publication date
FR2518767B1 (de) 1984-07-27
EP0083268A1 (de) 1983-07-06
EP0083268B1 (de) 1987-04-15
FR2518767A1 (fr) 1983-06-24

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee