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Method and circuit for controlling an electromagnetic actuator in photographic apparatus

  • US 4,408,857 A
  • Filed: 03/22/1982
  • Issued: 10/11/1983
  • Est. Priority Date: 03/22/1982
  • Status: Expired due to Fees
First Claim
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1. In photographic apparatus having an electromagnetic actuator of the type including an armature mounted for movement between a rest position and an extreme position in a magnetic field and means for urging the armature toward the rest position, a control circuit comprising:

  • means for applying a first polarity voltage pulse to said armature of duration effective for moving said armature against the force of said urging means to a programmed position between said rest position and said extreme position; and

    means for applying an opposite polarity voltage pulse to said armature of duration effective for braking said armature at said programmed position.

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