GB1398942A - Camera exposure time control device - Google Patents

Camera exposure time control device

Info

Publication number
GB1398942A
GB1398942A GB3963973A GB3963973A GB1398942A GB 1398942 A GB1398942 A GB 1398942A GB 3963973 A GB3963973 A GB 3963973A GB 3963973 A GB3963973 A GB 3963973A GB 1398942 A GB1398942 A GB 1398942A
Authority
GB
United Kingdom
Prior art keywords
shutter
resistor
aug
diaphragm
photo
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
GB3963973A
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.)
Pentax Corp
Original Assignee
Asahi Kogaku Kogyo Co 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 Asahi Kogaku Kogyo Co Ltd filed Critical Asahi Kogaku Kogyo Co Ltd
Publication of GB1398942A publication Critical patent/GB1398942A/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
    • 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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/58—Means for varying duration of "open" period of shutter

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Shutter-Related Mechanisms (AREA)
  • Exposure Control For Cameras (AREA)
  • Shutters For Cameras (AREA)

Abstract

1398942 Shutter control circuits ASAHI KOGAKU KOGYO KK 21 Aug 1973 [29 Aug 1972] 39639/73 Heading G2A A shutter control circuit has an exposure timing integrating capacitor CT which starts to charge when a transistor switch T 4 is turned off by an RC circuit V r C 1 , the resistance V r being adjustable so that the time at which T 4 conducts and initiates charging can be adjusted relative to the time at which the shutter opens in order to compensate for delay in, for instance, deenergization of a shutter-closing electromagnet M. As shown, the circuit includes a photo-conductor P located behind a diaphragm F adjusted according to film speed, and a resistor R 1 coupled to the diaphragm. Alternatively resistor R may be fixed and photo-conductor P replaced by a variable resistor for manually setting shutter speed.
GB3963973A 1972-08-29 1973-08-21 Camera exposure time control device Expired GB1398942A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1972100837U JPS5344444Y2 (en) 1972-08-29 1972-08-29

Publications (1)

Publication Number Publication Date
GB1398942A true GB1398942A (en) 1975-06-25

Family

ID=14284414

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3963973A Expired GB1398942A (en) 1972-08-29 1973-08-21 Camera exposure time control device

Country Status (3)

Country Link
JP (1) JPS5344444Y2 (en)
DE (1) DE2343384A1 (en)
GB (1) GB1398942A (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3683767A (en) * 1970-06-22 1972-08-15 Minolta Camera Kk Electronic shutter system
US3742475A (en) * 1971-03-16 1973-06-26 Tif Instr Inc Gaseous impurity detector employing corona discharge phenomenon

Also Published As

Publication number Publication date
JPS4958346U (en) 1974-05-23
DE2343384A1 (en) 1974-03-21
JPS5344444Y2 (en) 1978-10-25

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PCNP Patent ceased through non-payment of renewal fee