GB596813A - Improvements in or relating to screens for viewing projected optical images - Google Patents

Improvements in or relating to screens for viewing projected optical images

Info

Publication number
GB596813A
GB596813A GB14544/46A GB1454446A GB596813A GB 596813 A GB596813 A GB 596813A GB 14544/46 A GB14544/46 A GB 14544/46A GB 1454446 A GB1454446 A GB 1454446A GB 596813 A GB596813 A GB 596813A
Authority
GB
United Kingdom
Prior art keywords
screens
relating
optical images
sheet
group
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
GB14544/46A
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.)
THOMAS MARMADUKE CONSTABLE LAN
Cinema Television Ltd
Original Assignee
THOMAS MARMADUKE CONSTABLE LAN
Cinema Television Ltd
Filing date
Publication date
Application filed by THOMAS MARMADUKE CONSTABLE LAN, Cinema Television Ltd filed Critical THOMAS MARMADUKE CONSTABLE LAN
Publication of GB596813A publication Critical patent/GB596813A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Milling Processes (AREA)

Abstract

596,813. Copying by milling. CINEMATELEVISION, Ltd., and LANCE, T. M. C. June 8, 1945, No. 14544. [Class 83 (iii)] [Also in Group XX] The Specification describes a method of cutting a series of prismatic grooves, in the form of a continuous spiral to act as a Fresnel type lens, on the face of a sheet of transparent material such as known under the Registered Trade Mark " Perspex." The sheet 9 is rotated by a shaft 10 by which also, through bevel gearing 13, the rotating milling cutter 11 is advanced in a guide 14. The cutter shaft is also supported by a block 16 carried in an inclined guide 15 to control the angle of the groove as the radius increases. Specification 606,010, [Group XX], is referred to.
GB14544/46A 1945-06-08 Improvements in or relating to screens for viewing projected optical images Expired GB596813A (en)

Publications (1)

Publication Number Publication Date
GB596813A true GB596813A (en) 1948-01-12

Family

ID=1730823

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14544/46A Expired GB596813A (en) 1945-06-08 Improvements in or relating to screens for viewing projected optical images

Country Status (1)

Country Link
GB (1) GB596813A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067530A (en) * 1959-12-23 1962-12-11 Bolsey Jacques Projection screen adapted to have writing applied thereto
US3578841A (en) * 1967-12-15 1971-05-18 William B Elmer Rear projection screen
US4616217A (en) * 1981-05-22 1986-10-07 The Marconi Company Limited Visual simulators, computer generated imagery, and display systems

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3067530A (en) * 1959-12-23 1962-12-11 Bolsey Jacques Projection screen adapted to have writing applied thereto
US3578841A (en) * 1967-12-15 1971-05-18 William B Elmer Rear projection screen
US4616217A (en) * 1981-05-22 1986-10-07 The Marconi Company Limited Visual simulators, computer generated imagery, and display systems

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