GB477825A - Improvements in projection screens - Google Patents

Improvements in projection screens

Info

Publication number
GB477825A
GB477825A GB1008836A GB1008836A GB477825A GB 477825 A GB477825 A GB 477825A GB 1008836 A GB1008836 A GB 1008836A GB 1008836 A GB1008836 A GB 1008836A GB 477825 A GB477825 A GB 477825A
Authority
GB
United Kingdom
Prior art keywords
screen
cells
stepped
rubber
barriers
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
GB1008836A
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 GB1008836A priority Critical patent/GB477825A/en
Publication of GB477825A publication Critical patent/GB477825A/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
    • G03B21/60—Projection screens characterised by the nature of the surface

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

477,825. Projection screens. LENNARD, M. April 6, 1936, No. 10088. [Class 97 (i)] The surface of a projection screen consists of recessed stepped cells separated by narrow projecting barriers and occupying the major portion of the screen area. Fig. 1 shows square cells separated by barriers 13 and stepped to form surfaces 10, 11, 12. The width of the surface 11 may be slightly greater than that of the surface 12, and sound-transmitting holes 18, Fig. 4, may open through the sides of the cells from depressions or channels 17 in the back surface of the screen. The cells may be of triangular, hexagonal, circular, or other shape, or may be of irregular shape in random arrangement, and the steps may be curved as at 23, 24, 25 in Fig. 5. The screen may be produced by moulding, the mould being built up from similar separate elements locked in a chase ; it may be of rubber, to permit rolling, and may comprise sponge rubber 15 between surface rubber 14 and a fabric &c. backing 16. The screen may be flat, convex, or concave. According to the Provisional Specification, the stepped cells may be replaced by stepped projections.
GB1008836A 1936-04-06 1936-04-06 Improvements in projection screens Expired GB477825A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1008836A GB477825A (en) 1936-04-06 1936-04-06 Improvements in projection screens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1008836A GB477825A (en) 1936-04-06 1936-04-06 Improvements in projection screens

Publications (1)

Publication Number Publication Date
GB477825A true GB477825A (en) 1938-01-06

Family

ID=9961246

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1008836A Expired GB477825A (en) 1936-04-06 1936-04-06 Improvements in projection screens

Country Status (1)

Country Link
GB (1) GB477825A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2314943A (en) * 1996-07-01 1998-01-14 Nashua Corp Projection or depixelating screen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2314943A (en) * 1996-07-01 1998-01-14 Nashua Corp Projection or depixelating screen
GB2314943B (en) * 1996-07-01 2000-08-30 Nashua Corp Improvements in or relating to light diffusers

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