GB897214A - Improvements in or relating to a method and apparatus for copying representations - Google Patents

Improvements in or relating to a method and apparatus for copying representations

Info

Publication number
GB897214A
GB897214A GB2900157A GB2900157A GB897214A GB 897214 A GB897214 A GB 897214A GB 2900157 A GB2900157 A GB 2900157A GB 2900157 A GB2900157 A GB 2900157A GB 897214 A GB897214 A GB 897214A
Authority
GB
United Kingdom
Prior art keywords
transparency
sept
photo
amplifier
intensity
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
GB2900157A
Inventor
Hans Gerhard Lubszynski
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical Industries 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB2900157A priority Critical patent/GB897214A/en
Publication of GB897214A publication Critical patent/GB897214A/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)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

897,214. Copying by scanning; photoelectric control of photographic printing apparatus. ELECTRIC & MUSICAL INDUSTRIES Ltd. Sept. 5, 1958 [Sept. 14, 1957], No. 29001/57. Class 40(3). A transparency 20 is scanned by a flying spot produced by a first gun 2 in a cathoderay tube I to produce signals in a photoelectric cell 22 which are applied via an A.C. amplifier 23 to modulate the intensity of the flying spot whereby a corresponding charge pattern is built up on an electrode 16 in front of the fluorescent screen 14, a flooding gun 12, 13 being released subsequently to produce a simultaneous pattern of light in accordance with the charge pattern for printing the transparency on a surface 21. The modulation imparted by the signals from the photo-electric cell 22 is arranged so that the intensity is increased when the spot passes through a dense region of the transparency and vice versa. Amplifier 23 may introduce a desired gamma. During printing the output from photo-electric cell 22 may be switched at 24 to an integrating and switching circuit 25 which serves to apply a blanking potential to an electrode 15 after a desired exposure has been made.
GB2900157A 1957-09-14 1957-09-14 Improvements in or relating to a method and apparatus for copying representations Expired GB897214A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2900157A GB897214A (en) 1957-09-14 1957-09-14 Improvements in or relating to a method and apparatus for copying representations

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2900157A GB897214A (en) 1957-09-14 1957-09-14 Improvements in or relating to a method and apparatus for copying representations

Publications (1)

Publication Number Publication Date
GB897214A true GB897214A (en) 1962-05-23

Family

ID=10284669

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2900157A Expired GB897214A (en) 1957-09-14 1957-09-14 Improvements in or relating to a method and apparatus for copying representations

Country Status (1)

Country Link
GB (1) GB897214A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468706A (en) * 1979-02-13 1984-08-28 Coulter Systems Corporation Imaging by varying the placement of elements in the pixels

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4468706A (en) * 1979-02-13 1984-08-28 Coulter Systems Corporation Imaging by varying the placement of elements in the pixels

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