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Electronic shutter for photographic camera

  • US 3,922,691 A
  • Filed: 12/17/1973
  • Issued: 11/25/1975
  • Est. Priority Date: 12/20/1972
  • Status: Expired due to Term
First Claim
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1. An electronic shutter means for photographic cameras comprising a shutter, an electromagnet coupled to said shutter means for energizing said electromagnet so that said shutter is open when said electromagnet is energized and closed when said electromagnet is deenergized, an exposure time control circuit coupled to said electromagnet upon energization thereof and functioning to maintain said energized electromagnet in an energized condition and thereafter to deenergize said electromagnet after a time delay, a receiving device having a stand-by condition and responsive to a wireless control signal in said stand-by condition for generating an output signal, means responsive to said output signal for energizing said electromagnet energizing means when said receiving device receives a wireless control signal, and a change-over switch means coupling said electromagnet when it is deenergized to said receiving device, said change-over switch means being switched by energization of said electromagnet to thereby couple said electromagnet to said exposure time control circuit, said changeover switch means thereby connecting said electromagnet with said receiving device when said receiving device is in a stand-by condition for receiving the wireless control signal and with said exposure time control circuit in response to said receiving device receiving the wireless control signal.

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