GB606010A - Improvements in optical projection screens - Google Patents

Improvements in optical projection screens

Info

Publication number
GB606010A
GB606010A GB8346/46A GB834646A GB606010A GB 606010 A GB606010 A GB 606010A GB 8346/46 A GB8346/46 A GB 8346/46A GB 834646 A GB834646 A GB 834646A GB 606010 A GB606010 A GB 606010A
Authority
GB
United Kingdom
Prior art keywords
fresnel lens
projection screens
optical projection
march
series
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
GB8346/46A
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.)
Marconis Wireless Telegraph Co Ltd
Original Assignee
Marconis Wireless Telegraph Co Ltd
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 Marconis Wireless Telegraph Co Ltd filed Critical Marconis Wireless Telegraph Co Ltd
Publication of GB606010A publication Critical patent/GB606010A/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
    • G03B21/62—Translucent screens
    • G03B21/625—Lenticular translucent screens

Abstract

606,010. Projection screens. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. March 18, 1946, No. 8346. Convention date, March 17, 1945. [Class 97 (i)] A back projection screen is formed with a series of prismatic grooves 3, forming a Fresnel lens, on the back and a series of cylindrical ribs 4 on the front, with a diffusing layer 2, for example of gelatin, between. The diffusing layer may be provided by forming the Fresnel lens and the ribs 4 on a single opalescent sheet. The grooves of the Fresnel lens may be concentric and circular or in a continuous spiral.
GB8346/46A 1945-03-17 1946-03-18 Improvements in optical projection screens Expired GB606010A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US606010XA 1945-03-17 1945-03-17

Publications (1)

Publication Number Publication Date
GB606010A true GB606010A (en) 1948-08-04

Family

ID=22030546

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8346/46A Expired GB606010A (en) 1945-03-17 1946-03-18 Improvements in optical projection screens

Country Status (1)

Country Link
GB (1) GB606010A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4616217A (en) * 1981-05-22 1986-10-07 The Marconi Company Limited Visual simulators, computer generated imagery, and display systems
GB2436498A (en) * 2005-07-09 2007-09-26 Ncast Ltd Rear projection screen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4616217A (en) * 1981-05-22 1986-10-07 The Marconi Company Limited Visual simulators, computer generated imagery, and display systems
GB2436498A (en) * 2005-07-09 2007-09-26 Ncast Ltd Rear projection screen
GB2436498B (en) * 2005-07-09 2009-01-07 Ncast Ltd Rear projection screen

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