GB345353A - Improvements in screens for optical projection - Google Patents

Improvements in screens for optical projection

Info

Publication number
GB345353A
GB345353A GB35725/29A GB3572529A GB345353A GB 345353 A GB345353 A GB 345353A GB 35725/29 A GB35725/29 A GB 35725/29A GB 3572529 A GB3572529 A GB 3572529A GB 345353 A GB345353 A GB 345353A
Authority
GB
United Kingdom
Prior art keywords
screen
screens
newman
cover
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
GB35725/29A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB35725/29A priority Critical patent/GB345353A/en
Publication of GB345353A publication Critical patent/GB345353A/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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/58—Projection screens collapsible, e.g. foldable; of variable area
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)

Abstract

345,353. Projection screens. NEWMAN, F. J. and NEWMAN, J. W., 1, Harcourt Buildings, Temple, London. Aug. 15, 1930, No. 35725/29. [Class 97 (i).] A cover A to shield a projection screen B from extraneous light comprises a narrow horizontal surface at the top of the screen, side walls, and a front wall extending from the top surface in front of the screen and preventing the screen or the major portion of it from being seen by a person looking horizontally towards it. The screen may be opaque or translucent and may consist of a mirror; the interior of the cover may be blackened.
GB35725/29A 1930-08-15 1930-08-15 Improvements in screens for optical projection Expired GB345353A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB35725/29A GB345353A (en) 1930-08-15 1930-08-15 Improvements in screens for optical projection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35725/29A GB345353A (en) 1930-08-15 1930-08-15 Improvements in screens for optical projection

Publications (1)

Publication Number Publication Date
GB345353A true GB345353A (en) 1931-03-26

Family

ID=10380891

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35725/29A Expired GB345353A (en) 1930-08-15 1930-08-15 Improvements in screens for optical projection

Country Status (1)

Country Link
GB (1) GB345353A (en)

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