GB766776A - Improvements in or relating to apparatus for photographic optical projection - Google Patents

Improvements in or relating to apparatus for photographic optical projection

Info

Publication number
GB766776A
GB766776A GB2070556A GB2070556A GB766776A GB 766776 A GB766776 A GB 766776A GB 2070556 A GB2070556 A GB 2070556A GB 2070556 A GB2070556 A GB 2070556A GB 766776 A GB766776 A GB 766776A
Authority
GB
United Kingdom
Prior art keywords
transparency
objective
light
illuminated
photographic
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
GB2070556A
Inventor
Geoffrey Bond Harrison
Arthur Philip Jenkins
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.)
Ilford Imaging UK Ltd
Original Assignee
Ilford 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 Ilford Ltd filed Critical Ilford Ltd
Priority to GB2070556A priority Critical patent/GB766776A/en
Publication of GB766776A publication Critical patent/GB766776A/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
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection-Type Copiers In General (AREA)

Abstract

766,776. Photographic copying optical systems. ILFORD, Ltd. Feb. 22, 1955 [March 19, 1954]. No. 20705/56. Divided out of 766,775. Classes 97(1) and 98(1) A photographic transparency is illuminated by a substantially parallel beam of light obtained from a small light source and an image is projected by an objective lens, at least one secondary beam of light being obtained from the source by a mirror and directed through the transparency in a direction not to pass through the objective lens unless deviated by the transparency. In the form shown the transparency is illuminated by a lamp 11 with condenser 14. The beam 13 from the lamp passes through the objective 16. Secondary light rays, such as 19, are reflected through the transparency by a frusto pyramidal arrangement of plane mirrors 18. The system 'helps to neutralize the effect produced by scratches on the image formed by the beam 13. The relative intensities of the main and reflected beams may be controlled by varying the-aperture of the objective by a diaphragm or by a grey filter in the main beam. The Provisional Specification also contains the subject matter of Specification 766,775.
GB2070556A 1954-03-19 1954-03-19 Improvements in or relating to apparatus for photographic optical projection Expired GB766776A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2070556A GB766776A (en) 1954-03-19 1954-03-19 Improvements in or relating to apparatus for photographic optical projection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2070556A GB766776A (en) 1954-03-19 1954-03-19 Improvements in or relating to apparatus for photographic optical projection

Publications (1)

Publication Number Publication Date
GB766776A true GB766776A (en) 1957-01-23

Family

ID=10150313

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2070556A Expired GB766776A (en) 1954-03-19 1954-03-19 Improvements in or relating to apparatus for photographic optical projection

Country Status (1)

Country Link
GB (1) GB766776A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043190A (en) * 1958-08-01 1962-07-10 Gretag Ag Lighting arrangement for projector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043190A (en) * 1958-08-01 1962-07-10 Gretag Ag Lighting arrangement for projector

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