GB990930A - Improvements relating to image projectors - Google Patents

Improvements relating to image projectors

Info

Publication number
GB990930A
GB990930A GB809063A GB809063A GB990930A GB 990930 A GB990930 A GB 990930A GB 809063 A GB809063 A GB 809063A GB 809063 A GB809063 A GB 809063A GB 990930 A GB990930 A GB 990930A
Authority
GB
United Kingdom
Prior art keywords
mirror
lens
axis
pivotable
slot
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
GB809063A
Inventor
William Arthur Bocock
Wallace Palmer Jennings
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB809063A priority Critical patent/GB990930A/en
Publication of GB990930A publication Critical patent/GB990930A/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
    • G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action

Landscapes

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

Abstract

990,930. Projection apparatus. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Jan. 24,1964 [Feb.28, 1963], No.8090/63. Heading G2J. A projector comprises a transparent display surface S, on which written notes may be made, between a light source L and an inclined mirror R which directs light through a projection lens P on to screen V, lens P and mirror R being indepently pivotable about a common axis P 1 and coupled at spaced positions to a linking level L which, in turn, pivots about another axis P 2 spaced from it parallel to P 1 . The ratio of the respective distances from axis P 1 and P 2 to the pin and slot E, F coupling lever L to mirror R being such that the mirror turns through half the angle through which the lens is rotated. Lever L is also coupled by pin and slot C, D to lens holder A pivotable at P 1 .
GB809063A 1963-02-28 1963-02-28 Improvements relating to image projectors Expired GB990930A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB809063A GB990930A (en) 1963-02-28 1963-02-28 Improvements relating to image projectors

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB809063A GB990930A (en) 1963-02-28 1963-02-28 Improvements relating to image projectors

Publications (1)

Publication Number Publication Date
GB990930A true GB990930A (en) 1965-05-05

Family

ID=9845570

Family Applications (1)

Application Number Title Priority Date Filing Date
GB809063A Expired GB990930A (en) 1963-02-28 1963-02-28 Improvements relating to image projectors

Country Status (1)

Country Link
GB (1) GB990930A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472589A (en) * 1965-10-23 1969-10-14 Beseler Co Charles Overhead projector
EP0197691A1 (en) * 1985-04-01 1986-10-15 Minnesota Mining And Manufacturing Company Automatic focus for overhead projector
US4735500A (en) * 1985-04-04 1988-04-05 Grunwald Peter H Overhead projector
US4952053A (en) * 1987-08-24 1990-08-28 Procent Patent Und Verwaltungs Ag Transparency overhead projector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3472589A (en) * 1965-10-23 1969-10-14 Beseler Co Charles Overhead projector
EP0197691A1 (en) * 1985-04-01 1986-10-15 Minnesota Mining And Manufacturing Company Automatic focus for overhead projector
US4634246A (en) * 1985-04-01 1987-01-06 Minnesota Mining And Manufacturing Company Automatic focus for overhead projector
US4735500A (en) * 1985-04-04 1988-04-05 Grunwald Peter H Overhead projector
US4952053A (en) * 1987-08-24 1990-08-28 Procent Patent Und Verwaltungs Ag Transparency overhead projector

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