GB833747A - Improvements in or relating to apparatus for photographic printing - Google Patents

Improvements in or relating to apparatus for photographic printing

Info

Publication number
GB833747A
GB833747A GB1854356A GB1854356A GB833747A GB 833747 A GB833747 A GB 833747A GB 1854356 A GB1854356 A GB 1854356A GB 1854356 A GB1854356 A GB 1854356A GB 833747 A GB833747 A GB 833747A
Authority
GB
United Kingdom
Prior art keywords
paper
june
photo
filter
photographic printing
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
GB1854356A
Inventor
David James Causley
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.)
Rank Cintel Ltd
Original Assignee
Rank Cintel 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 Rank Cintel Ltd filed Critical Rank Cintel Ltd
Priority to GB1854356A priority Critical patent/GB833747A/en
Publication of GB833747A publication Critical patent/GB833747A/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
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
    • G03B27/725—Optical projection devices wherein the contrast is controlled electrically (e.g. cathode ray tube masking)

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection-Type Copiers In General (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)

Abstract

833,747. Photo-electric printing control. RANK CINTEL Ltd. June 17, 1957 [June 15, 1956], No. 18543/56. Class 40 (3). In photographic printing apparatus in which a scanning spot of light from a cathode-ray tube 1 is focused through a negative 7 on to printing paper 8 and the light passing through the paper falls on a photo-cell 12 which feeds back through an amplifier 13 to the cathoderay tube to control its brightness, a filter 9 of varying density is arranged behind the paper 8 to compensate for variations in exposure caused by the distance of the spot from the centre of the paper. The filter may consist of a positive obtained from a film exposed.behind a film of uniform density.
GB1854356A 1956-06-15 1956-06-15 Improvements in or relating to apparatus for photographic printing Expired GB833747A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1854356A GB833747A (en) 1956-06-15 1956-06-15 Improvements in or relating to apparatus for photographic printing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1854356A GB833747A (en) 1956-06-15 1956-06-15 Improvements in or relating to apparatus for photographic printing

Publications (1)

Publication Number Publication Date
GB833747A true GB833747A (en) 1960-04-27

Family

ID=10114238

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1854356A Expired GB833747A (en) 1956-06-15 1956-06-15 Improvements in or relating to apparatus for photographic printing

Country Status (1)

Country Link
GB (1) GB833747A (en)

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