Patents Examined by Rebecca D. Cass
  • Objective lens system for endoscopes
    Patent number: RE33689
    Abstract: An objective lens system for endoscopes having favorably corrected distortion. Said lens system comprising a front lens group having negative refractive power and a rear lens group having positive refractive power, arranged in said front lens group is a lens component having an aspherical surface having portions whose curvature is increased as they are farther from the optical axis or decreases as they are farther from the optical axis.
    Type: Grant
    Filed: May 3, 1989
    Date of Patent: September 10, 1991
    Assignee: Olympus Optical Co., Ltd.
    Inventor: Kimihiko Nishioka