GB892414A - Improvements relating to photographic printing - Google Patents

Improvements relating to photographic printing

Info

Publication number
GB892414A
GB892414A GB18996/58A GB1899658A GB892414A GB 892414 A GB892414 A GB 892414A GB 18996/58 A GB18996/58 A GB 18996/58A GB 1899658 A GB1899658 A GB 1899658A GB 892414 A GB892414 A GB 892414A
Authority
GB
United Kingdom
Prior art keywords
spot
printing
negative
intensity
constant
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
GB18996/58A
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.)
Logetronics Inc
Original Assignee
Logetronics Inc
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 Logetronics Inc filed Critical Logetronics Inc
Publication of GB892414A publication Critical patent/GB892414A/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)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

892,414. Photographic printing. LOGETRONICS Inc. June 13, 1958 [June 17, 1957], No. 18996/58. Drawings to Specification. Class 98(2). [Also in Group XL(b)] A photographic printing process of the type in which a travelling light spot produced on a cathode ray tube passes through the negative and printing paper and is received on a photoelectric cell to maintain the intensity of the spot incident on the cell constant partial dodging is produced by reducing the feedback signal from the cells of the cathode ray electrode so that the spot is not maintained completely constant by controlling spot intensity for part of the printing period only allowing it to be constant for the rest or by inserting a diffusing plate part way into the light path between the tube and the negative so that the negative receives diffused overall illumination as well as the varying printing spot. In all cases a further photo-cell receiving light which has passed through the printing paper and, negative feeds an integrating circuit to terminate the printing after a desired exposure while in the case of the second method above the circuit may control the instant at which the variation of spot intensity ceases.
GB18996/58A 1959-06-17 1958-06-13 Improvements relating to photographic printing Expired GB892414A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US892414XA 1959-06-17 1959-06-17

Publications (1)

Publication Number Publication Date
GB892414A true GB892414A (en) 1962-03-28

Family

ID=22216511

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18996/58A Expired GB892414A (en) 1959-06-17 1958-06-13 Improvements relating to photographic printing

Country Status (1)

Country Link
GB (1) GB892414A (en)

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