Patents Assigned to Kabushiki Kaisha Sanko Seiki Seisakusho
  • Optical pickup device with wedge shaped and concave lens for correcting a coma and astigmatism
    Patent number: 5496993
    Abstract: Disclosed is an optical pickup device comprising a light source for irradiating a light beam onto an object from a light source, a half mirror for introducing said light beam reflected by the object to an optical detector; and a wedge-shaped photosensitive element, disposed between said half mirror and said optical detector, for cancelling out a coma produced by said half mirror.
    Type: Grant
    Filed: July 23, 1993
    Date of Patent: March 5, 1996
    Assignee: Kabushiki Kaisha Sanko Seiki Seisakusho
    Inventor: Ikuo Kasuga