GB864320A - Automatic photo-electric exposure control device - Google Patents

Automatic photo-electric exposure control device

Info

Publication number
GB864320A
GB864320A GB35468/58A GB3546858A GB864320A GB 864320 A GB864320 A GB 864320A GB 35468/58 A GB35468/58 A GB 35468/58A GB 3546858 A GB3546858 A GB 3546858A GB 864320 A GB864320 A GB 864320A
Authority
GB
United Kingdom
Prior art keywords
photo
resistor
relay
light
arrangement shown
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
GB35468/58A
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.)
Carl Zeiss AG
Original Assignee
Carl Zeiss 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 Carl Zeiss AG filed Critical Carl Zeiss AG
Publication of GB864320A publication Critical patent/GB864320A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/4209—Photoelectric exposure meters for determining the exposure time in recording or reproducing
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

864,320. Photo-electric exposure control. ZEISS-STIFTUNG, C., [trading as ZEISS, C. [firm of]] Nov. 5, 1958 [Nov. 7, 1957], No. 35468/58. Class 40(3) A photographic exposure is timed by a condenser charged through a photo-resistor. In the arrangement shown in Fig. 3 part of the exposing light is deflected by a beamsplitting plate 7 on to a light-variable resistor 9 which may be of cadmium sulphide. To make the resistance variation not nearly dependent on the light intensity, the intensity of light reaching the cell is reduced by a grey filter 10 consisting of a rotatable polarizing disc or a variable diaphragm and the spectral sensitivity of the photo resistor may be corrected by means of a colour filter. In the circuit arrangement shown in Fig. 4, the photo resistance 9 is connected in series with resistors 14, 15 the value of which corresponds to that of the photo resistor with medium illumination. This adopts the resistance variation more nearly to the Schwartzchild's constant. The series resistor may also be variable. In the arrangement shown a different one of condensers 16-22, is selected according to the sensitivity of the photographic material. In operation closure of the main supply causes the left-hand side of the bi-stable circuit to conduct operating relay 28 and preparing relay 29. Press button 32 operates relay 33 and, in turn, relay 35 to switch on the exposing light and removes a short circuit from the selected charging condenser. The voltage across the condenser increases at a rate determined by light intensity incident on the photo-resistor 9 until it is sufficient to change over the bi-stable circuit de-energizing relay 35 and ending the exposure.
GB35468/58A 1957-11-07 1958-11-05 Automatic photo-electric exposure control device Expired GB864320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE864320X 1957-11-07

Publications (1)

Publication Number Publication Date
GB864320A true GB864320A (en) 1961-04-06

Family

ID=6801639

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35468/58A Expired GB864320A (en) 1957-11-07 1958-11-05 Automatic photo-electric exposure control device

Country Status (2)

Country Link
FR (1) FR1215142A (en)
GB (1) GB864320A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205803A (en) * 1963-03-29 1965-09-14 Polaroid Corp Shutter timing apparatus
US3711721A (en) * 1971-10-07 1973-01-16 D Hansen Automatic exposure control for controlling photographic shutter
JPS5241636U (en) * 1976-08-19 1977-03-24

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3205803A (en) * 1963-03-29 1965-09-14 Polaroid Corp Shutter timing apparatus
US3711721A (en) * 1971-10-07 1973-01-16 D Hansen Automatic exposure control for controlling photographic shutter
JPS5241636U (en) * 1976-08-19 1977-03-24
JPS537712Y2 (en) * 1976-08-19 1978-02-27

Also Published As

Publication number Publication date
FR1215142A (en) 1960-04-14

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