GB963551A - Improvements in or relating to optical projection apparatus - Google Patents

Improvements in or relating to optical projection apparatus

Info

Publication number
GB963551A
GB963551A GB813562A GB813562A GB963551A GB 963551 A GB963551 A GB 963551A GB 813562 A GB813562 A GB 813562A GB 813562 A GB813562 A GB 813562A GB 963551 A GB963551 A GB 963551A
Authority
GB
United Kingdom
Prior art keywords
projection apparatus
filter
sector
light
rear 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
GB813562A
Inventor
Kenneth Robert Honick
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.)
MINI OF AVIAT LONDON
Original Assignee
MINI OF AVIAT LONDON
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 MINI OF AVIAT LONDON filed Critical MINI OF AVIAT LONDON
Priority to GB813562A priority Critical patent/GB963551A/en
Publication of GB963551A publication Critical patent/GB963551A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)

Abstract

963,551. Rear projection apparatus. MINISTER OF AVIATION. Feb. 26, 1963 [March 2, 1962], No. 8135/62. Heading G2J. In optical rear projection apparatus as in Specification 926,448 for use in aircraft, for example, under variable ambient light conditions, the brightness of the projected image is controlled by a selective light filter 18 comprising a series metal wire gauze pieces of different mesh 23, 24, 25, carried on a sector 22 pivoted at 21 and guided between the flanges of wheel 30. "Clicker" mechanism 28 holds the sector at any of five positions with respect to the optical axis 26, position 1 as shown, corresponding to unobstructed light while position 5 corresponds to complete light cut-off by extension 27, as in broken lines. Filters 23, 24, 25 may alternatively be of apertured plates or of metal foil with etched holes. Filter 18 is placed between lamp 15 and heat filter 16 in contact with lens 17 of condenser 14;while compound objective 12 projects an image from transparency 13 on to translucent screen 11 having a Fresnel lens.
GB813562A 1962-03-02 1962-03-02 Improvements in or relating to optical projection apparatus Expired GB963551A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB813562A GB963551A (en) 1962-03-02 1962-03-02 Improvements in or relating to optical projection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB813562A GB963551A (en) 1962-03-02 1962-03-02 Improvements in or relating to optical projection apparatus

Publications (1)

Publication Number Publication Date
GB963551A true GB963551A (en) 1964-07-08

Family

ID=9846425

Family Applications (1)

Application Number Title Priority Date Filing Date
GB813562A Expired GB963551A (en) 1962-03-02 1962-03-02 Improvements in or relating to optical projection apparatus

Country Status (1)

Country Link
GB (1) GB963551A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610747A (en) * 1968-08-22 1971-10-05 Retention Communication System Cartridge-loaded film strip projector, particularly for narrow film

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610747A (en) * 1968-08-22 1971-10-05 Retention Communication System Cartridge-loaded film strip projector, particularly for narrow film

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