JPS57205719A - Electromagnetically driven shutter - Google Patents

Electromagnetically driven shutter

Info

Publication number
JPS57205719A
JPS57205719A JP9187781A JP9187781A JPS57205719A JP S57205719 A JPS57205719 A JP S57205719A JP 9187781 A JP9187781 A JP 9187781A JP 9187781 A JP9187781 A JP 9187781A JP S57205719 A JPS57205719 A JP S57205719A
Authority
JP
Japan
Prior art keywords
rotor
coil
focusing operation
ring
electricity
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.)
Pending
Application number
JP9187781A
Other languages
Japanese (ja)
Inventor
Michiro Hirohata
Hideo Igari
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP9187781A priority Critical patent/JPS57205719A/en
Priority to US06/381,785 priority patent/US4452521A/en
Priority to DE19823220266 priority patent/DE3220266A1/en
Publication of JPS57205719A publication Critical patent/JPS57205719A/en
Pending 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
    • G03B9/00—Exposure-making shutters; Diaphragms
    • G03B9/08—Shutters
    • G03B9/10—Blade or disc rotating or pivoting about axis normal to its plane
    • G03B9/24—Adjusting size of aperture formed by members when fully open so as to constitute a virtual diaphragm that is adjustable

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Focusing (AREA)
  • Shutters For Cameras (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To make opening of blade members sure by retreating a tightening lever which starts automatic focusing operation from the operating region of a member generating electromagnetic driving force after controlling the focusing operation. CONSTITUTION:Upon ending of automatic focusing operation, a control circuit supplies electricity again to a coil 1 to turn a rotor 2 clockwise, but this gives no influence upon a tightening lever 11. At this time, a sector ring 4 is driven by the turning of the rotor 2 and turns clockwise, thereby starting exposure. When an exposure control mechanism detects prescribed exposure thereafter, the control circuits interrupts the supply of electricity to the coil 1. This results in that the pushing part 4b of the ring 4 receives strong resetting force in a counterclockwise direction from the projecting part 2a of the rotor 2. Therefore, when the supply of electricity to the coil 1 is interrupted, the ring 4 is quickly inverted of its moving direction, and closes shutter blades. The opening of the blade members is made sure in this way.
JP9187781A 1981-06-02 1981-06-15 Electromagnetically driven shutter Pending JPS57205719A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP9187781A JPS57205719A (en) 1981-06-15 1981-06-15 Electromagnetically driven shutter
US06/381,785 US4452521A (en) 1981-06-02 1982-05-25 Camera having an electromagnetically driven shutter
DE19823220266 DE3220266A1 (en) 1981-06-02 1982-05-28 CAMERA WITH ELECTRO-MAGNETIC OPERATED LOCK

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9187781A JPS57205719A (en) 1981-06-15 1981-06-15 Electromagnetically driven shutter

Publications (1)

Publication Number Publication Date
JPS57205719A true JPS57205719A (en) 1982-12-16

Family

ID=14038784

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9187781A Pending JPS57205719A (en) 1981-06-02 1981-06-15 Electromagnetically driven shutter

Country Status (1)

Country Link
JP (1) JPS57205719A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH075521A (en) * 1993-11-04 1995-01-10 Canon Inc Shutter device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH075521A (en) * 1993-11-04 1995-01-10 Canon Inc Shutter device

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