GB486200A - Improvements in or relating to optical projection screens - Google Patents

Improvements in or relating to optical projection screens

Info

Publication number
GB486200A
GB486200A GB2375436A GB2375436A GB486200A GB 486200 A GB486200 A GB 486200A GB 2375436 A GB2375436 A GB 2375436A GB 2375436 A GB2375436 A GB 2375436A GB 486200 A GB486200 A GB 486200A
Authority
GB
United Kingdom
Prior art keywords
projection screens
liquids
relating
black
optical projection
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
GB2375436A
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.)
CHARLES HENRY YONWIN
Original Assignee
CHARLES HENRY YONWIN
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 CHARLES HENRY YONWIN filed Critical CHARLES HENRY YONWIN
Priority to GB2375436A priority Critical patent/GB486200A/en
Publication of GB486200A publication Critical patent/GB486200A/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

Abstract

486,200. Projection screens. DIGGLE, A. H., and YONWIN, C. H. Aug. 31, 1936, No. 23754. [Class 97 (i)] A black or red screen comprises a textile fabric rendered translucent by applying oleagenous, glutinous, farinaceous or cellulosic liquids or semi-liquids and afterwards treated with gelatinous matter over which (or mixed therewith) is applied a solution of formaldehyde or potassium bichromate which is then exposed to light. The red screen when illuminated by blue light, or the black screen, are invisible to the audience, and for front projection a reflective backing may be provided. Specification 457,830 is referred to.
GB2375436A 1936-08-31 1936-08-31 Improvements in or relating to optical projection screens Expired GB486200A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2375436A GB486200A (en) 1936-08-31 1936-08-31 Improvements in or relating to optical projection screens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2375436A GB486200A (en) 1936-08-31 1936-08-31 Improvements in or relating to optical projection screens

Publications (1)

Publication Number Publication Date
GB486200A true GB486200A (en) 1938-05-31

Family

ID=10200765

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2375436A Expired GB486200A (en) 1936-08-31 1936-08-31 Improvements in or relating to optical projection screens

Country Status (1)

Country Link
GB (1) GB486200A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2506075A3 (en) * 2011-03-30 2013-01-02 Karl Storz GmbH & Co. KG Display device for an operating theatre

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2506075A3 (en) * 2011-03-30 2013-01-02 Karl Storz GmbH & Co. KG Display device for an operating theatre
US9122142B2 (en) 2011-03-30 2015-09-01 Karl Storz Gmbh & Co. Kg Display apparatus for an operating room

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