JPS57100416A - Shutter device of electromagnetic drive - Google Patents

Shutter device of electromagnetic drive

Info

Publication number
JPS57100416A
JPS57100416A JP17767180A JP17767180A JPS57100416A JP S57100416 A JPS57100416 A JP S57100416A JP 17767180 A JP17767180 A JP 17767180A JP 17767180 A JP17767180 A JP 17767180A JP S57100416 A JPS57100416 A JP S57100416A
Authority
JP
Japan
Prior art keywords
magnet
ring
magnetic
mobile coil
reduced
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
JP17767180A
Other languages
Japanese (ja)
Inventor
Shuichiro Saito
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 JP17767180A priority Critical patent/JPS57100416A/en
Publication of JPS57100416A publication Critical patent/JPS57100416A/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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Shutters For Cameras (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

PURPOSE:To obtain a magnetic flux having high stability and high density, by adding the auxiliary magnets to an electromagnetic driving device of shutter which has a mobile coil turning in the magnetic field of a ring-shaped magnet and accordingly increasing the number of magnetic fluxes crossing the mobile coil. CONSTITUTION:An electromagnetic device has a mobile coil provided in a gap of a yoke 15 enclosing around a ring-shaped magnet 11 and is driven by the electric conduction. For such electromagnetic device, auxiliary magnets 13a, 13b, 13c and 13d are attached at the upper and lower sides of the magnet 11. Thus the leakage of the magnetic flux is reduced, and the magnetic fluxes passing through yokes 12 and 15 are increased. Th auxiliary magnet can use the ferrite, etc. which is ordinarily used. As a result, the volume can be reduced for the ring 11 that has to use a rare earth magnet in order to obtain an intensive magnetic field. This accordingly reduces the cost.
JP17767180A 1980-12-16 1980-12-16 Shutter device of electromagnetic drive Pending JPS57100416A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17767180A JPS57100416A (en) 1980-12-16 1980-12-16 Shutter device of electromagnetic drive

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17767180A JPS57100416A (en) 1980-12-16 1980-12-16 Shutter device of electromagnetic drive

Publications (1)

Publication Number Publication Date
JPS57100416A true JPS57100416A (en) 1982-06-22

Family

ID=16035066

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17767180A Pending JPS57100416A (en) 1980-12-16 1980-12-16 Shutter device of electromagnetic drive

Country Status (1)

Country Link
JP (1) JPS57100416A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2791483A1 (en) * 1999-03-22 2000-09-29 Valeo Equip Electr Moteur ROTATING MACHINE COMPRISING MAGNETS OF DIFFERENT COMPOSITIONS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2791483A1 (en) * 1999-03-22 2000-09-29 Valeo Equip Electr Moteur ROTATING MACHINE COMPRISING MAGNETS OF DIFFERENT COMPOSITIONS

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