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Interchangeable lens video camera system having improved focusing

  • US 6,683,652 B1
  • Filed: 08/26/1996
  • Issued: 01/27/2004
  • Est. Priority Date: 08/29/1995
  • Status: Expired due to Term
First Claim
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1. A lens assembly detachably attached to a camera having image sensing means for sensing an image of an object and outputting an image signal, comprising:

  • a variable power lens for performing a zooming operation;

    a focus lens for performing a focusing operation and compensating for a movement of an in-focus point caused by the zooming operation of said variable power lens;

    memory means for storing position information of said variable power lens and said focus lens;

    focus detection means for receiving an evaluation value associated with an image sensing state of an object from the image signal outputted from said camera and extracting, from the received image signal, an evaluation value which changes in accordance with a focus state; and

    control means for controlling said variable power lens and said focus lens on the basis of the position information stored in said memory means and the evaluation value associated with the image sensing state obtained by said focus detection means.

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