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ELECTRIC CAMERA SHUTTER WITH RELATED CONTROLS

  • US 3,797,028 A
  • Filed: 05/09/1972
  • Issued: 03/12/1974
  • Est. Priority Date: 05/11/1971
  • Status: Expired due to Term
First Claim
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1. In a camera having circuitry for automatically determining the extent to which film in the camera is exosed, said circuitry including electromagnetic means for terminating an exposure upon deenergizing of said electromagnetic means, a DC voltage source electrically connected to said electromagnetic means, and means for simultaneously supplying to said electromagnetic means a rippled direct current having a weak AC component so that the latter together with the supply from said DC voltage source counteract an electromagnetic attractive force generated due to magnetic hysteresis of said electromagnetic means when the latter is deenergized.

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