×

Focus detection device and accompanying optical equipment

  • US 5,825,016 A
  • Filed: 03/06/1996
  • Issued: 10/20/1998
  • Est. Priority Date: 03/07/1995
  • Status: Expired due to Term
First Claim
Patent Images

1. A focus detection device, including an optical system which forms first and second images, and a sensor having photodetector elements which detect said first and second images, for detecting a focus condition of an objective lens based on a relative position between said first and second images, said device comprising:

  • a first focus detector which divides said first image into plural areas and detects a first relative distance between said first and second images;

    a second focus detector which divides one of said areas into smaller areas and uses said smaller areas to detect a second relative distance between said first and second images; and

    a calculator which calculates a final relative distance based on one of said first and second relative distances.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×