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Focusing system and method with adjustment for lens depth of focus

  • US 4,362,372 A
  • Filed: 03/18/1981
  • Issued: 12/07/1982
  • Est. Priority Date: 03/03/1980
  • Status: Expired due to Term
First Claim
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1. The method of focusing a variable aperture objective lens of a photographic camera having a range finder to determine the distance from the camera to the near part of a subject to be photographed, focus control means for positioning said lens at a focus setting corresponding to the distance determined by said range finder and aperture control means for determining the effective lens aperture value for proper exposure of camera-contained film to said subject, said method comprising the steps of:

  • generating a signal representative of objective lens depth of focus for the determined lens aperture value to be used; and

    transmitting said signal to said focus control means to effect a focusing adjustment of said lens in accordance wth said determined aperture value to a focus setting corresponding to a distance greater than that determined by said range finder.

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