GB929675A - Improvements in or relating to optical projection systems - Google Patents

Improvements in or relating to optical projection systems

Info

Publication number
GB929675A
GB929675A GB4325260A GB4325260A GB929675A GB 929675 A GB929675 A GB 929675A GB 4325260 A GB4325260 A GB 4325260A GB 4325260 A GB4325260 A GB 4325260A GB 929675 A GB929675 A GB 929675A
Authority
GB
United Kingdom
Prior art keywords
screen
projection systems
relating
plate
optical 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
GB4325260A
Inventor
Philip Neville George Knowles
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.)
Decca Ltd
Original Assignee
Decca 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 Decca Ltd filed Critical Decca Ltd
Priority to GB4325260A priority Critical patent/GB929675A/en
Publication of GB929675A publication Critical patent/GB929675A/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)

Abstract

929,675. Projection systems. DECCA Ltd. Feb. 28, 1962 [Dec. 15, 1960], No. 43252/60. Class 97 (1). Information written on the upper surface of a transparent plate 11 edge-illuminated by lamp 12 is projected on to a screen 10 by an optical system including a lens 14 and orthogonal mirrors 15. Instead of the two mirrors 15, a single mirror and an erecting prism may be used. Additional data may be superimposed on screen 10 by including a semi-reflector, preferably in the optical path between plate 11 and lens 14. The plate 11 and screen 10 may be disposed in parallel planes.
GB4325260A 1960-12-15 1960-12-15 Improvements in or relating to optical projection systems Expired GB929675A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4325260A GB929675A (en) 1960-12-15 1960-12-15 Improvements in or relating to optical projection systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4325260A GB929675A (en) 1960-12-15 1960-12-15 Improvements in or relating to optical projection systems

Publications (1)

Publication Number Publication Date
GB929675A true GB929675A (en) 1963-06-26

Family

ID=10427937

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4325260A Expired GB929675A (en) 1960-12-15 1960-12-15 Improvements in or relating to optical projection systems

Country Status (1)

Country Link
GB (1) GB929675A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249004A (en) * 1963-10-14 1966-05-03 Brunswick Corp Depth-of-field correction for projection system
US3269258A (en) * 1964-04-09 1966-08-30 Brunswick Corp Means for correcting depth-of-field error in a projection system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3249004A (en) * 1963-10-14 1966-05-03 Brunswick Corp Depth-of-field correction for projection system
US3269258A (en) * 1964-04-09 1966-08-30 Brunswick Corp Means for correcting depth-of-field error in a projection system

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