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Linear motor-driven focal plane shutter

  • US 4,051,499 A
  • Filed: 04/15/1976
  • Issued: 09/27/1977
  • Est. Priority Date: 04/18/1975
  • Status: Expired due to Term
First Claim
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1. A linear motor-driven focal plane shutter for a camera comprising in combination:

  • a flat shutter blind slidable back and forth along a fixed path to open and close the film aperture in the camera,a flat permanent magnet sealed within the shutter blind along a plane approximately bisecting the thickness thereof,a series of electromagnetic coils arranged in a line in the direction of travel of the shutter blind, said electromagnetic coils being situated along the path followed by a pole of the permanent magnet of the shutter blind,means for sequentially energizing the electromagnetic coils to cause the shutter blind in which the associated permanent magnet is sealed to run in the direction in which the electromagnetic coils are energized in accordance with the principle of a linear motor,a shutter control circuit for sequentially energizing the series of electromagnetic coils.

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