FR1156748A - Optical projection device - Google Patents

Optical projection device

Info

Publication number
FR1156748A
FR1156748A FR1156748DA FR1156748A FR 1156748 A FR1156748 A FR 1156748A FR 1156748D A FR1156748D A FR 1156748DA FR 1156748 A FR1156748 A FR 1156748A
Authority
FR
France
Prior art keywords
projection device
optical projection
optical
projection
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
Other languages
French (fr)
Inventor
Paul William Sefton-Brown
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 filed Critical
Application granted granted Critical
Publication of FR1156748A publication Critical patent/FR1156748A/en
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
    • G03B21/10—Projectors with built-in or built-on screen
    • G03B21/11—Projectors with built-in or built-on screen for microfilm reading
    • G03B21/115—Projectors with built-in or built-on screen for microfilm reading of microfiches
FR1156748D 1956-09-14 1956-09-14 Optical projection device Expired FR1156748A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1156748T 1956-09-14

Publications (1)

Publication Number Publication Date
FR1156748A true FR1156748A (en) 1958-05-20

Family

ID=9650163

Family Applications (1)

Application Number Title Priority Date Filing Date
FR1156748D Expired FR1156748A (en) 1956-09-14 1956-09-14 Optical projection device

Country Status (1)

Country Link
FR (1) FR1156748A (en)

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