Electric camera shutter with voltage checking circuit

  • US 3,886,443 A
  • Filed: 05/29/1973
  • Issued: 05/27/1975
  • Est. Priority Date: 05/13/1971
  • Status: Expired due to Term
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First Claim
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1. In a camera, circuitry for automatically determining the extent to which film in the camera is exposed, a voltage source, a main switch connected between said voltage source and said circuitry for transmitting voltage from said voltage source to said circuitry when said main switch is closed, meter means electrically connected with said circuitry for providing information with respect thereto, checking circuit means for checking the condition of said voltage source, said checking circuit means consisting of components which are entirely separate from said circuitry so that none of the components of said checking circuit means are in common with components of said circuitry, and including electronic thermal compensating means for thermally compensating the checking circuit means, said checking circuit means being operatively connected with said meter means for indicating at said meter means the condition of said voltage source, and a normally open switch electrically connected between said checking circuit means and said voltage source to be closed, when said main switch is open, for connecting said checking circuit means between said voltage source and said meter means so that the latter will give a reading indicating the condition of said voltage source.

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