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Focus warning system for a manually-focused still video camera having an electronic viewfinder

  • US 4,739,411 A
  • Filed: 12/10/1986
  • Issued: 04/19/1988
  • Est. Priority Date: 12/10/1986
  • Status: Expired due to Fees
First Claim
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1. In a video camera providing a movie image for viewing and a still image for recording, the camera including an optical section for establishing an optical aperture and for focusing image light upon a light sensor, an electronic viewfinder connected to the light sensor for displaying the movie image, and a focus warning system for generating a control signal indicative of a focusing problem, the improvement in which said focus warning system comprises;

  • means for determining the aperture necessary for the movie image displayed in the viewfinder;

    means for determining the aperture necessary for the still image; and

    means for activating the control signal when said still aperture differs from said movie aperture.

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