GB691214A - Improvements in or relating to optical projection systems - Google Patents

Improvements in or relating to optical projection systems

Info

Publication number
GB691214A
GB691214A GB2742450A GB2742450A GB691214A GB 691214 A GB691214 A GB 691214A GB 2742450 A GB2742450 A GB 2742450A GB 2742450 A GB2742450 A GB 2742450A GB 691214 A GB691214 A GB 691214A
Authority
GB
United Kingdom
Prior art keywords
mirror
headstock
reflector
cord
annular
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
GB2742450A
Inventor
Harold Sefto Molyneux-Ffennell
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.)
COUNTY COMMERCIAL CARS SALES L
Original Assignee
COUNTY COMMERCIAL CARS SALES L
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 COUNTY COMMERCIAL CARS SALES L filed Critical COUNTY COMMERCIAL CARS SALES L
Priority to GB2742450A priority Critical patent/GB691214A/en
Publication of GB691214A publication Critical patent/GB691214A/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

Landscapes

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

Abstract

691,214. Optical apparatus. COUNTY COMMERCIAL CARS (SALES), Ltd. Nov. 7, 1951 [Nov. 9, 1950], No. 24724/50. Class 97 (i). [Also in Group XXI] The invention relates to apparatus wherein an optical projector forms an image of, for example, a kinematographic film on a screen by reflection from a mirror orientable about at least one axis. In such a system the mirror 5 intercepts only the part of the light beam emanating from a particular part of the film or the remainder falling an annular reflector 6 which spreads it over a large screen area. The apparatus is intended to produce a light background to the picture projected on to a part-spherical screen in gunnery instructional apparatus. As shown, the inner edge of the annular reflector 6 is tangential to a plane parallel to the mirror 5 which is recessed. The combined reflector is carried on a parallel motion linkage on a headstock 19. The linkage is actuated by a cord 21 to pivot the reflector about a horizontal axis passing through the mirror 5. Rotation about a vertical axis is produced by rotation of the headstock 19 on the pedestal 23. The cord 21 passes over a pulley 22 on the headstock and pulleys 24, 25, 26 on the pedestal, its end being secured to the end of a lever 27 pivoted at 28. A cord 31 is anchored to a return spring 32 at one end, passes round the cylindrical part 34 of the headstock and is secured at the other end to the lever 35. Changes in aspect of the projected target image are produced by variations in the film itself. Changes in target position are produced by movements of the mirror derived from movements of the lower ends of the levers 27, 35 determined by.cams 38, 39 driven through sprockets and chain 44 from the proprojector. The cams are detachable by a wing-nut 42. To increase the amount of light falling on the annular reflector 6 the kinematograph projector used in conjunction with the illustrated apparatus may be provided, around its objective, with a ring of lamps or an annular lamp and baffles which confine the light therefrom so that it falls only on the annular reflector.
GB2742450A 1950-11-09 1950-11-09 Improvements in or relating to optical projection systems Expired GB691214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2742450A GB691214A (en) 1950-11-09 1950-11-09 Improvements in or relating to optical projection systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2742450A GB691214A (en) 1950-11-09 1950-11-09 Improvements in or relating to optical projection systems

Publications (1)

Publication Number Publication Date
GB691214A true GB691214A (en) 1953-05-06

Family

ID=10259349

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2742450A Expired GB691214A (en) 1950-11-09 1950-11-09 Improvements in or relating to optical projection systems

Country Status (1)

Country Link
GB (1) GB691214A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2546322A1 (en) * 1983-05-16 1984-11-23 Gq Defence Equip Ltd Cinematograph film producing method for image presentation system
FR2560705A1 (en) * 1984-03-02 1985-09-06 Gq Defence Equip Ltd DEVICE FOR PRESENTING THE IMAGE OF A TARGET
GB2155158A (en) * 1984-03-02 1985-09-18 Gq Defence Equip Ltd Target image presentation system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2546322A1 (en) * 1983-05-16 1984-11-23 Gq Defence Equip Ltd Cinematograph film producing method for image presentation system
FR2560705A1 (en) * 1984-03-02 1985-09-06 Gq Defence Equip Ltd DEVICE FOR PRESENTING THE IMAGE OF A TARGET
GB2155158A (en) * 1984-03-02 1985-09-18 Gq Defence Equip Ltd Target image presentation system

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