GB842573A - Improvements in or relating to photographic printing apparatus - Google Patents

Improvements in or relating to photographic printing apparatus

Info

Publication number
GB842573A
GB842573A GB2066957A GB2066957A GB842573A GB 842573 A GB842573 A GB 842573A GB 2066957 A GB2066957 A GB 2066957A GB 2066957 A GB2066957 A GB 2066957A GB 842573 A GB842573 A GB 842573A
Authority
GB
United Kingdom
Prior art keywords
oscillator
spot
scanning
july
photo
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
GB2066957A
Inventor
George Stanley Elphick
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 GB2066957A priority Critical patent/GB842573A/en
Publication of GB842573A publication Critical patent/GB842573A/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)
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
    • G03C5/08—Photoprinting; Processes and means for preventing photoprinting

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

842,573. Photo-electric printing control. RANK CINTEL Ltd. July 1, 1958 [July 1, 1957], No. 20669/57. Class 40(3). [Also in Group XX] The invention relates to photographic printing apparatus of the type in which a scanning spot of light from a cathode ray tube I passes through the negative 4 and printing paper 5 and is received on a photo-electric cell 6, the output of which is fed back through an amplifier to control the spot brightness. According to the invention, in order that the scanning pattern shall not be precisely repeated, the travel of the spot is controlled by two oscillators 14, 15 each controlling the current in a pair of scanning coils, the arrangement being that the output frequency from oscillator 14 is controlled at 2 k.c/sec. while that from oscillator 15 is caused to vary through a range, from 1.9 to 2.1 k.c/sec. The variation may be produced by a reactance valve in the oscillator fed with the increasing voltage of a timing capacitor which suppresses the cathode ray tube beam after a predetermined time. Specification 833,747 is referred to.
GB2066957A 1957-07-01 1957-07-01 Improvements in or relating to photographic printing apparatus Expired GB842573A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2066957A GB842573A (en) 1957-07-01 1957-07-01 Improvements in or relating to photographic printing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2066957A GB842573A (en) 1957-07-01 1957-07-01 Improvements in or relating to photographic printing apparatus

Publications (1)

Publication Number Publication Date
GB842573A true GB842573A (en) 1960-07-27

Family

ID=10149705

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2066957A Expired GB842573A (en) 1957-07-01 1957-07-01 Improvements in or relating to photographic printing apparatus

Country Status (1)

Country Link
GB (1) GB842573A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2211314A (en) * 1987-10-20 1989-06-28 Brother Ind Ltd Light irradiation control device for use in image recording apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2211314A (en) * 1987-10-20 1989-06-28 Brother Ind Ltd Light irradiation control device for use in image recording apparatus
US4945222A (en) * 1987-10-20 1990-07-31 Brother Kogyo Kabushiki Kaisha Light irradiation control device for use in image recording apparatus
GB2211314B (en) * 1987-10-20 1992-05-13 Brother Ind Ltd Light irradiation control device for use in image recording apparatus

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