GB959070A - Photographic exposure apparatus - Google Patents

Photographic exposure apparatus

Info

Publication number
GB959070A
GB959070A GB2088462A GB2088462A GB959070A GB 959070 A GB959070 A GB 959070A GB 2088462 A GB2088462 A GB 2088462A GB 2088462 A GB2088462 A GB 2088462A GB 959070 A GB959070 A GB 959070A
Authority
GB
United Kingdom
Prior art keywords
triode
grid
condenser
photo
cell
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
GB2088462A
Inventor
Roy Arthur Clapp
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.)
Pako Corp
Original Assignee
Pako Corp
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 Pako Corp filed Critical Pako Corp
Priority to GB2088462A priority Critical patent/GB959070A/en
Publication of GB959070A publication Critical patent/GB959070A/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
    • G03B27/73—Controlling exposure by variation of spectral composition, e.g. multicolor printers
    • G03B27/735—Controlling exposure by variation of spectral composition, e.g. multicolor printers in dependence upon automatic analysis of the original

Landscapes

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

Abstract

959,070. Pulse generating circuits. PAKA CORPORATION. May 30, 1962, No. 20884/62. Heading H3P. [Also in Divisions G1 and G2] A pulse generator having a frequency dependent upon the current through a photocell comprises two triodes 54, 64. Triode 64 is normally conductive and the D.C. potentials in the circuit are such that a negative bias is applied to the grid 58 of triode 54. The current through the photo-cell 42 charges a condenser 52 until the triode 54 conducts, thus applying a negative pulse to a counter 80 and to the grid 68 to cut-off triode 68. The potential on anode 66 and grid 58 rises to increase conduction in the triode 54 which continues until the condenser voltage falls to a predetermined level at which the circuit switches back to its original condition and photo-cell 42 commences to recharge condenser 52.
GB2088462A 1962-05-30 1962-05-30 Photographic exposure apparatus Expired GB959070A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2088462A GB959070A (en) 1962-05-30 1962-05-30 Photographic exposure apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2088462A GB959070A (en) 1962-05-30 1962-05-30 Photographic exposure apparatus

Publications (1)

Publication Number Publication Date
GB959070A true GB959070A (en) 1964-05-27

Family

ID=10153383

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2088462A Expired GB959070A (en) 1962-05-30 1962-05-30 Photographic exposure apparatus

Country Status (1)

Country Link
GB (1) GB959070A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988009953A1 (en) * 1987-06-12 1988-12-15 Eastman Kodak Company Filter apparatus for use in a photographic printer
WO1988009955A1 (en) * 1987-06-12 1988-12-15 Eastman Kodak Company Photographic printer
WO1988009956A1 (en) * 1987-06-12 1988-12-15 Eastman Kodak Company Photographic printer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1988009953A1 (en) * 1987-06-12 1988-12-15 Eastman Kodak Company Filter apparatus for use in a photographic printer
WO1988009955A1 (en) * 1987-06-12 1988-12-15 Eastman Kodak Company Photographic printer
WO1988009956A1 (en) * 1987-06-12 1988-12-15 Eastman Kodak Company Photographic printer

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