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Motor drive system for camera

  • US 3,946,409 A
  • Filed: 09/07/1973
  • Issued: 03/23/1976
  • Est. Priority Date: 09/20/1972
  • Status: Expired due to Term
First Claim
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1. A motor drive system for a camera, comprising a reversible electric motor, a drive shaft for film advancement, means responsive to operation of said motor in one direction for turning said shaft from an initial position in a direction to advance film in said camera and responsive to subsequent operation of said motor in the opposite direction for turning said shaft back to said initial position, means for energizing said motor to operate in said one direction, and motor torque responsive means including means for detecting the current drawn by said motor for sensing when said film has been advanced to a predetermined extent and for thereupon energizing said motor to operate in said opposite direction.

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