GB501645A - Improvements in or relating to optical image viewing arrangements - Google Patents

Improvements in or relating to optical image viewing arrangements

Info

Publication number
GB501645A
GB501645A GB2129037A GB2129037A GB501645A GB 501645 A GB501645 A GB 501645A GB 2129037 A GB2129037 A GB 2129037A GB 2129037 A GB2129037 A GB 2129037A GB 501645 A GB501645 A GB 501645A
Authority
GB
United Kingdom
Prior art keywords
sheet
relating
cellulose acetate
optical image
diffusing
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
GB2129037A
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 GB2129037A priority Critical patent/GB501645A/en
Publication of GB501645A publication Critical patent/GB501645A/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)
  • Optical Elements Other Than Lenses (AREA)

Abstract

501,645. Moulding lenticulated surfaces. BROWNE; C. O., and HOLMAN, H. E. July 31, 1937, Nos. 21290 and 27707. Drawings to Specification. [Class 87 (ii)] [Also in Groups XVI and XX] The surface of a body is provided with a series of spiral or concentric grooves of increasing inclination to form a Fresnel lens. The grooves may be engraved directly on the surface or they may be pressed on by a stamper formed by electrotyping from a wax mother. The body may be a transparent sheet of cellulose acetate or artificial resin and may have one surface rendered diffusing or it may be united to a glass backing sheet which may be diffusing. The sheet may also be silvered on the back or front. If desired the stamping dies may be produced by hardening an engraved soft body such as cellulose acetate or silica gel. Specification 371,893, [Group XX], is referred to.
GB2129037A 1937-07-31 1937-07-31 Improvements in or relating to optical image viewing arrangements Expired GB501645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2129037A GB501645A (en) 1937-07-31 1937-07-31 Improvements in or relating to optical image viewing arrangements

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2129037A GB501645A (en) 1937-07-31 1937-07-31 Improvements in or relating to optical image viewing arrangements

Publications (1)

Publication Number Publication Date
GB501645A true GB501645A (en) 1939-02-28

Family

ID=10160376

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2129037A Expired GB501645A (en) 1937-07-31 1937-07-31 Improvements in or relating to optical image viewing arrangements

Country Status (1)

Country Link
GB (1) GB501645A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463280A (en) * 1943-02-16 1949-03-01 Frank J Kaehni Spectroscope grating having spaced zones of diffraction lines
GB2123739A (en) * 1982-04-30 1984-02-08 James Christopher Ernes Harper Profile forming apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2463280A (en) * 1943-02-16 1949-03-01 Frank J Kaehni Spectroscope grating having spaced zones of diffraction lines
GB2123739A (en) * 1982-04-30 1984-02-08 James Christopher Ernes Harper Profile forming apparatus

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