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Electromagnetically driven shutter device

  • US 4,353,632 A
  • Filed: 12/31/1980
  • Issued: 10/12/1982
  • Est. Priority Date: 01/08/1980
  • Status: Expired due to Term
First Claim
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1. An electronically driven shutter comprising:

  • at least one shutter blade for opening and closing an optical path by displacement of said blade;

    a permanent magnet member forming a magnetic field, a conductive member in the magnetic field of the permanent magnet, the one of the permanent magnet member and the conductive member being movable and connected to the shutter blade, the other member being fixed in the camera so that when a current is supplied to the conductive member along a predetermined direction an electromagnetic force operates between the permanent magnet member and the conductive member and displaces the movable one of the members so that the shutter blade opens and closes the photographic optical path at a given speed; and

    a magnetic sensor at a predetermined position relative to one of the members so as to detect the displacement position of the movable one of the members.

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