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Camera having focus detection device

  • US 4,247,187 A
  • Filed: 07/07/1978
  • Issued: 01/27/1981
  • Est. Priority Date: 07/14/1977
  • Status: Expired due to Term
First Claim
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1. A camera comprising:

  • objective lens means adjustable along an optical axis for focusing on an object;

    focus detecting means for detecting the focusing condition of the lens means relative to the object and for providing an output representing the focusing condition of the lens means relative to the object;

    supplementary means operable instead of said focus detection means for providing, when operated, an output representing an approximate focusing condition of the lens means relative to the object;

    condition detecting means for detecting whether the condition for operation of the focus detection means can insure the proper operation of the focus detection means and providing a characteristic output when detecting that the condition cannot insure the proper operation of the focus detection means;

    output control means for controlling the provision of the output of the focus detection means, said output control means being responsive to the characteristic output of the condition detecting means and for prohibiting the output of the focus detection means in response to said characteristic output of the condition detecting means;

    manually operable control means adapted for setting said supplementary means to an operative state; and

    exposure operation control means for controlling the exposure operation of the camera, said exposure operation control means being responsive to the outputs of said focusing detection means and said supplementary means and enabling the exposure operation of the camera only when said lens means is set to the focused position based on the output of said focus detection means or set to the approximately focused position based on the output of said supplementary means.

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