GB519262A - Improvements relating to optical projection apparatus - Google Patents

Improvements relating to optical projection apparatus

Info

Publication number
GB519262A
GB519262A GB2934338A GB2934338A GB519262A GB 519262 A GB519262 A GB 519262A GB 2934338 A GB2934338 A GB 2934338A GB 2934338 A GB2934338 A GB 2934338A GB 519262 A GB519262 A GB 519262A
Authority
GB
United Kingdom
Prior art keywords
projection apparatus
area
optical projection
improvements relating
opaque
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
GB2934338A
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.)
GAINSBOROUGH PICTURES 1928 Ltd
Original Assignee
GAINSBOROUGH PICTURES 1928 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 GAINSBOROUGH PICTURES 1928 Ltd filed Critical GAINSBOROUGH PICTURES 1928 Ltd
Priority to GB2934338A priority Critical patent/GB519262A/en
Publication of GB519262A publication Critical patent/GB519262A/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
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lenses (AREA)
  • Projection Apparatus (AREA)

Abstract

519,262. Optical-projection apparatus. DAVIS, A., and GAINSBOROUGH PICTURES (1928), Ltd. Oct. 10, 1938, No. 29343. Drawings to Specification, [Class 97 (i)] In apparatus for projecting backgrounds in scenic settings, a small central opaque or lightdiffusing area is provided between the light source and the transparency. The area may be formed by sand blasting or etching parts of one or both surfaces of a condenser lens, or by the provision of an opaque or graduated area on a separate glass plate or otherwise.
GB2934338A 1938-10-10 1938-10-10 Improvements relating to optical projection apparatus Expired GB519262A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2934338A GB519262A (en) 1938-10-10 1938-10-10 Improvements relating to optical projection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2934338A GB519262A (en) 1938-10-10 1938-10-10 Improvements relating to optical projection apparatus

Publications (1)

Publication Number Publication Date
GB519262A true GB519262A (en) 1940-03-20

Family

ID=10290049

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2934338A Expired GB519262A (en) 1938-10-10 1938-10-10 Improvements relating to optical projection apparatus

Country Status (1)

Country Link
GB (1) GB519262A (en)

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