GB1447525A - Camera shutter control circuit - Google Patents

Camera shutter control circuit

Info

Publication number
GB1447525A
GB1447525A GB4758873A GB4758873A GB1447525A GB 1447525 A GB1447525 A GB 1447525A GB 4758873 A GB4758873 A GB 4758873A GB 4758873 A GB4758873 A GB 4758873A GB 1447525 A GB1447525 A GB 1447525A
Authority
GB
United Kingdom
Prior art keywords
switch
control circuit
transistor
shutter control
camera shutter
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
GB4758873A
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 GB1447525A publication Critical patent/GB1447525A/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
    • H03K17/16—Modifications for eliminating interference voltages or currents
    • 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)
  • Shutters For Cameras (AREA)
  • Electronic Switches (AREA)
  • Indication In Cameras, And Counting Of Exposures (AREA)
  • Exposure Control For Cameras (AREA)

Abstract

1447525 Shutter timing circuit ASAHI KOGAKU KOGYO KK 11 Oct 1973 [13 Oct 1972] 47588/73 Heading G2A A shutter timing circuit 1 is energized by closing a mechanical switch 3 to turn on a transistor switch 2, an RC circuit 4, 5 being provided so that if the switch 3 chatters the capacitor 4 discharges slowly during the open periods of switch 3 to keep the transistor 2 on. An F.E.T. or S.C.R. may replace transistor 2. A flip-flop circuit may alternatively be used.
GB4758873A 1972-10-13 1973-10-11 Camera shutter control circuit Expired GB1447525A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11830172U JPS4974829U (en) 1972-10-13 1972-10-13

Publications (1)

Publication Number Publication Date
GB1447525A true GB1447525A (en) 1976-08-25

Family

ID=14733277

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4758873A Expired GB1447525A (en) 1972-10-13 1973-10-11 Camera shutter control circuit

Country Status (4)

Country Link
JP (1) JPS4974829U (en)
DE (1) DE2351192C3 (en)
FR (1) FR2203230B1 (en)
GB (1) GB1447525A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1569074A1 (en) * 2004-02-03 2005-08-31 High Tech Computer Corp. Noise-resistant touch-pad using capacitance

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5421330A (en) * 1977-07-18 1979-02-17 Konishiroku Photo Ind Co Ltd Power source resetting method in cameras
JPS5421329A (en) * 1977-07-18 1979-02-17 Hitachi Ltd Control system for cameras
JPS5540420A (en) * 1978-09-14 1980-03-21 Nippon Kogaku Kk <Nikon> Power supply control circuit of camera
JPS5542821U (en) * 1978-09-14 1980-03-19
JPS5669724U (en) * 1979-11-02 1981-06-09

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS446459Y1 (en) * 1966-04-25 1969-03-10
US3588525A (en) * 1966-12-16 1971-06-28 Hitachi Ltd Chattering preventing circuit
DE1728239A1 (en) * 1968-02-21 1972-03-09 Lanata Gio Batta Joint tool, in particular joint screwdriver

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1569074A1 (en) * 2004-02-03 2005-08-31 High Tech Computer Corp. Noise-resistant touch-pad using capacitance

Also Published As

Publication number Publication date
DE2351192A1 (en) 1974-05-02
FR2203230B1 (en) 1976-06-18
JPS4974829U (en) 1974-06-28
DE2351192B2 (en) 1977-10-13
DE2351192C3 (en) 1978-06-08
FR2203230A1 (en) 1974-05-10

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Legal Events

Date Code Title Description
PS Patent sealed
746 Register noted 'licences of right' (sect. 46/1977)
PE20 Patent expired after termination of 20 years

Effective date: 19931010