Patents Examined by Richard A. Basichas
  • Ophthalmic optical apparatus having an alignment optical system
    Patent number: 5285223
    Abstract: An ophthalmic optical apparatus having an alignment optical system comprises two conical optical elements for forming an alignment light beam into a ring-shaped collimated light beam centered on an optical axis and directing it to a focusing optical system, an in-focus state is determined based on a light pattern formed by the focusing optical system from the ring-shaped collimated light beam on an object plane.
    Type: Grant
    Filed: August 21, 1992
    Date of Patent: February 8, 1994
    Assignee: Nikon Corporation
    Inventors: Yasunori Ueno, Masanobu Kaneko