GB949517A - Electrical timing device for photographic exposure - Google Patents

Electrical timing device for photographic exposure

Info

Publication number
GB949517A
GB949517A GB38095/61A GB3809561A GB949517A GB 949517 A GB949517 A GB 949517A GB 38095/61 A GB38095/61 A GB 38095/61A GB 3809561 A GB3809561 A GB 3809561A GB 949517 A GB949517 A GB 949517A
Authority
GB
United Kingdom
Prior art keywords
potential
exposure
schwarzschild
photo
coefficient
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
GB38095/61A
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.)
Agfa Gevaert NV
Original Assignee
Agfa AG
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 Agfa AG filed Critical Agfa AG
Publication of GB949517A publication Critical patent/GB949517A/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
    • G03B27/80—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus in dependence upon automatic analysis of the original
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/28—Modifications for introducing a time delay before switching
    • H03K17/288—Modifications for introducing a time delay before switching in tube switches
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05G—X-RAY TECHNIQUE
    • H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
    • H05G1/08—Electrical details
    • H05G1/26—Measuring, controlling or protecting
    • H05G1/30—Controlling
    • H05G1/38—Exposure time
    • H05G1/42—Exposure time using arrangements for switching when a predetermined dose of radiation has been applied, e.g. in which the switching instant is determined by measuring the electrical energy supplied to the tube

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • X-Ray Techniques (AREA)

Abstract

949,517. Photo-electric exposure control. AGFA A.G. Oct. 24, 1961 [Oct.28, 1960], No.38095/61. Addition to 878,102. Heading G1A. [Also in Division G2] The device of the parent Specification for timing the exposure of photographic material is modified in that the means for varying the potential on an electrode of a valve in dependence upon the Schwarzschild coefficient of the photographic material comprise at least two resistance-capacity components, the capacitors thereof being connected in series. During exposure the photo-cell 28 charges a condenser 27 until the thyratron grid 37 rises to the potential of cathode 29, firing the valve to energize a relay 23 which extinguishes the printing lamp or operates a shutter. The cathode potential is the algebraic sum of the tapping potential of potentiometer 51 and the potential on condensers 32. The switches 23c, 23d are opened at the start of exposure and condensers 32, 34 charge to vary the cathode potential. The charing rate and the charging voltage are set by setting resistors 33, 35 and potentiometers 46,47 which are coupled to potentiometer 51, to allow for any particular Schwarzschild coefficient. Differences in spectral sensitivity of photo-cell and film may be corrected in the same way. The invention may be applied to X-ray photography and to colour printers employing simultaneous exposures by providing three timing devices or employing sequential exposure by providing means for automatically setting the timer in accordance with the Schwarzschild coefficient of each photosensitive layer. Specifications 817,277 and 863,606 also are referred to.
GB38095/61A 1960-10-28 1961-10-24 Electrical timing device for photographic exposure Expired GB949517A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEA35907A DE1146366B (en) 1960-10-28 1960-10-28 Timing device for photographic equipment

Publications (1)

Publication Number Publication Date
GB949517A true GB949517A (en) 1964-02-12

Family

ID=6929312

Family Applications (1)

Application Number Title Priority Date Filing Date
GB38095/61A Expired GB949517A (en) 1960-10-28 1961-10-24 Electrical timing device for photographic exposure

Country Status (5)

Country Link
US (1) US3166674A (en)
BE (1) BE609699A (en)
DE (1) DE1146366B (en)
GB (1) GB949517A (en)
NL (1) NL270378A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109802670A (en) * 2012-01-12 2019-05-24 沃拉克有限公司 For generating the method and switching device of electric signal in response to mechanical force

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2078677A (en) * 1932-10-19 1937-04-27 Westinghouse Electric & Mfg Co Lighting control
US2353979A (en) * 1942-07-04 1944-07-18 Westinghouse Electric & Mfg Co Measuring system
US2472815A (en) * 1946-08-23 1949-06-14 William D Fleming Automatic light control
BE513475A (en) * 1951-08-16 1952-08-30 Westinghouse Electric Corp photographic timer for image intensifier
US2929000A (en) * 1953-06-29 1960-03-15 Gen Electric Means for and method of interval timing
US2749799A (en) * 1953-08-13 1956-06-12 Strem Thomas Photographic exposure timing device
US2885563A (en) * 1954-10-05 1959-05-05 W M Welch Mfg Company Photographic exposure timer
US3033988A (en) * 1957-04-05 1962-05-08 Edgerton Germeshausen & Grier Method of and apparatus for the control of electric impulses
US2993124A (en) * 1959-02-02 1961-07-18 Gen Electric Timing apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109802670A (en) * 2012-01-12 2019-05-24 沃拉克有限公司 For generating the method and switching device of electric signal in response to mechanical force
CN109802670B (en) * 2012-01-12 2023-04-07 沃拉克有限公司 Method and switching device for generating an electrical signal in response to a mechanical force

Also Published As

Publication number Publication date
BE609699A (en) 1962-02-15
DE1146366B (en) 1963-03-28
US3166674A (en) 1965-01-19
NL270378A (en)

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