GB750319A - Improvements in and relating to optical projecting apparatus - Google Patents

Improvements in and relating to optical projecting apparatus

Info

Publication number
GB750319A
GB750319A GB1238553A GB1238553A GB750319A GB 750319 A GB750319 A GB 750319A GB 1238553 A GB1238553 A GB 1238553A GB 1238553 A GB1238553 A GB 1238553A GB 750319 A GB750319 A GB 750319A
Authority
GB
United Kingdom
Prior art keywords
case
hinged
wall
projector
screen
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
GB1238553A
Inventor
Colin Martin Williamson
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.)
Negretti Ltd
Original Assignee
Williamson Manufacturing 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 Williamson Manufacturing Co Ltd filed Critical Williamson Manufacturing Co Ltd
Priority to GB1238553A priority Critical patent/GB750319A/en
Publication of GB750319A publication Critical patent/GB750319A/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
    • G03B21/30—Details adapted to collapse or fold, e.g. for portability

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Overhead Projectors And Projection Screens (AREA)
  • Projection Apparatus (AREA)

Abstract

750,319. Optical-projection apparatus. WILLIAMSON MANUFACTURING CO., Ltd. Aug. 4, 1954 [May 4, 1953], No. 12385/53. Class 97 (1). The apparatus comprises a projector hinged to one wall of a case and a screen carried by the opposite wall, the two walls being rotatively hinged, the projector being interlinked with the opposite wall to be brought to operative position when the case is opened and folded down into the case when closed. As shown, the projector, with lamphouse 14, projection lens 16 and reflector 17, is hinged at 13 to brackets 12 carried by the wall 11 hinged at 24 to the remainder of the case. A link 22 connects pivots 21 and 23 on the projector and case respectively. The projector lies against the wall 11 when the case is closed and is raised as shown when it is open. A translucent screen 31 is mounted in an aperture in the wall 19 but may be covered by a hinged reflecting screen 32. The latter, if not required, is raised to the position shown dotted and then acts as a light shield. It may carry side curtains to assist this. In another embodiment the translucent screen is hinged inside the case, the reflecting screen being carried on the inside of a cover, for the aperture in the wall 19, hinged outside the case.
GB1238553A 1953-05-04 1953-05-04 Improvements in and relating to optical projecting apparatus Expired GB750319A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1238553A GB750319A (en) 1953-05-04 1953-05-04 Improvements in and relating to optical projecting apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1238553A GB750319A (en) 1953-05-04 1953-05-04 Improvements in and relating to optical projecting apparatus

Publications (1)

Publication Number Publication Date
GB750319A true GB750319A (en) 1956-06-13

Family

ID=10003582

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1238553A Expired GB750319A (en) 1953-05-04 1953-05-04 Improvements in and relating to optical projecting apparatus

Country Status (1)

Country Link
GB (1) GB750319A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022526A (en) * 1975-01-09 1977-05-10 Bell & Howell Company Portable film strip projector
US4092064A (en) * 1975-06-25 1978-05-30 Realist, Inc. Projectors
US4130352A (en) * 1976-11-11 1978-12-19 Bell & Howell Company Portable microfiche reader with foldup lens and mirror assembly
FR2535074A1 (en) * 1982-10-22 1984-04-27 Prestinox Sa Back projection device usable with a slide projector
FR2615010A1 (en) * 1987-05-07 1988-11-10 Pasqualini Bernard Self-positioning prefabricated projection unit for displaying photographs or documents in slide form

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022526A (en) * 1975-01-09 1977-05-10 Bell & Howell Company Portable film strip projector
US4092064A (en) * 1975-06-25 1978-05-30 Realist, Inc. Projectors
US4130352A (en) * 1976-11-11 1978-12-19 Bell & Howell Company Portable microfiche reader with foldup lens and mirror assembly
FR2535074A1 (en) * 1982-10-22 1984-04-27 Prestinox Sa Back projection device usable with a slide projector
FR2615010A1 (en) * 1987-05-07 1988-11-10 Pasqualini Bernard Self-positioning prefabricated projection unit for displaying photographs or documents in slide form

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