Patents Assigned to Laser Dynamcics, Inc.
  • Optical pick-up apparatus for multiple data surface optical disk system
    Patent number: 5966364
    Abstract: An optical pick-up device includes a laser source which emits multi-mode laser beam consist of varied wavelength in wide spectrum, and an optical filter which eliminates improper ranges of the laser's spectrum and transmits only preferred wavelength domains. Therefore, a diffraction device composed of at least two diffractive elements can produce several focal points dependent upon selected wavelength by the optical filter and diffractive index of the each diffractive element.
    Type: Grant
    Filed: October 27, 1997
    Date of Patent: October 12, 1999
    Assignee: Laser Dynamcics, Inc.
    Inventor: Yasuo Kamatani