GB691230A - An improved projection screen unit - Google Patents

An improved projection screen unit

Info

Publication number
GB691230A
GB691230A GB8759/51A GB875951A GB691230A GB 691230 A GB691230 A GB 691230A GB 8759/51 A GB8759/51 A GB 8759/51A GB 875951 A GB875951 A GB 875951A GB 691230 A GB691230 A GB 691230A
Authority
GB
United Kingdom
Prior art keywords
rods
projection screen
screen unit
fastenings
margins
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
GB8759/51A
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
Publication of GB691230A publication Critical patent/GB691230A/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
    • G03B21/565—Screens allowing free passage of sound

Landscapes

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

Abstract

691,230. Projection screens. SCHUMANN, M. April 16, 1951 [Sept. 6, 1950], No. 8759/51. Class 97 (i). A screen of polyvinyl sheet material haspockets round its margins to hold rods 7 and having cut-away portions 6 by which fastenings are attached to the rods. Such fastenings may be hooks 11 secured also to screw eyes 8 in the frame 1 or a cord 9 passed alternately round the rods and screw eyes. The pockets may be formed by turning over the margins of the screen material and securing by heat, sticking or sewing. The pocket may alternatively be made separately and of a different material.
GB8759/51A 1950-09-06 1951-04-16 An improved projection screen unit Expired GB691230A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE691230X 1950-09-06

Publications (1)

Publication Number Publication Date
GB691230A true GB691230A (en) 1953-05-06

Family

ID=6600902

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8759/51A Expired GB691230A (en) 1950-09-06 1951-04-16 An improved projection screen unit

Country Status (1)

Country Link
GB (1) GB691230A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2930652A1 (en) * 2008-04-28 2009-10-30 Screen Res Soc Par Actions Sim PROJECTION SCREEN EQUIPPED WITH MEANS FOR EXERCISING VERTICAL AND HORIZONTAL TRACTION FORCES

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2930652A1 (en) * 2008-04-28 2009-10-30 Screen Res Soc Par Actions Sim PROJECTION SCREEN EQUIPPED WITH MEANS FOR EXERCISING VERTICAL AND HORIZONTAL TRACTION FORCES
WO2009136113A1 (en) * 2008-04-28 2009-11-12 Screen Research Projector screen equipped with means for applying vertical and horizontal tensile forces
US8120846B2 (en) 2008-04-28 2012-02-21 Yves Trelohan Projector screen equipped with means for applying vertical and horizontal tensile forces

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