GB1474155A - Cameras having means for automatic exposure control - Google Patents

Cameras having means for automatic exposure control

Info

Publication number
GB1474155A
GB1474155A GB2231375A GB2231375A GB1474155A GB 1474155 A GB1474155 A GB 1474155A GB 2231375 A GB2231375 A GB 2231375A GB 2231375 A GB2231375 A GB 2231375A GB 1474155 A GB1474155 A GB 1474155A
Authority
GB
United Kingdom
Prior art keywords
diaphragm
cell
regulator
photo
light
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
GB2231375A
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.)
Pentacon GmbH Foto und Feinwerktechnik
Original Assignee
Pentacon Dresden VEB
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
Priority claimed from DD17918874A external-priority patent/DD115765A1/xx
Priority claimed from DD179713A external-priority patent/DD115764A1/xx
Application filed by Pentacon Dresden VEB filed Critical Pentacon Dresden VEB
Publication of GB1474155A publication Critical patent/GB1474155A/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
    • G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
    • G03B7/08—Control effected solely on the basis of the response, to the intensity of the light received by the camera, of a built-in light-sensitive device
    • G03B7/081—Analogue circuits
    • G03B7/083—Analogue circuits for control of exposure time

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Control For Cameras (AREA)
  • Cameras In General (AREA)

Abstract

1474155 SLR cameras PENTACON DRESDEN KAMERA UND KINOWERKE VEB 22 May 1975 [17 June 1974 5 July 1974] 22313/75 Heading G2A An SLR camera has an objective 1 with a preselectable diaphragm 2, partly transparent mirrors 3, 4 for directing light to a view-finder 16 and to a shutter-controlling photo-cell 6 and a light regulator 7 e.g. a diaphragm or filler located in front of the photo-cell 6 and coupled to the pre-selectable diaphragm 2 so that before exposure regulator 7 admits an amount of light to photocell 6 dependant on the pre-selected stop of diaphragm 2 and upon exposure as diaphragm 2 stops down, regulator 7 opens up whereby throughout the operation photo-cell 6 receives a constant light intensity. As shown, photo-cell 6 is coupled to an integrating capacitor 10 which controls closure of a shutter 9,13. Figs. 2, 3 and 4 (not shown), show preferred methods of coupling the diaphragm to the regulator.
GB2231375A 1974-06-17 1975-05-22 Cameras having means for automatic exposure control Expired GB1474155A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DD17918874A DD115765A1 (en) 1974-06-17 1974-06-17
DD179713A DD115764A1 (en) 1974-07-05 1974-07-05

Publications (1)

Publication Number Publication Date
GB1474155A true GB1474155A (en) 1977-05-18

Family

ID=25747527

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2231375A Expired GB1474155A (en) 1974-06-17 1975-05-22 Cameras having means for automatic exposure control

Country Status (3)

Country Link
JP (1) JPS513629A (en)
DE (1) DE2515514A1 (en)
GB (1) GB1474155A (en)

Also Published As

Publication number Publication date
JPS513629A (en) 1976-01-13
DE2515514A1 (en) 1976-01-02

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee