Patents Examined by James E. Tomessini
  • Optical information recording and reproducing apparatus
    Patent number: 4991158
    Abstract: An optical information recording and reporducing apparatus for recording and reproducing information optically against recording material, includes means for generating a first light beam for reproducing and erasing information which is previously recorded in the recording material, and means for providing a second light beam for recording new information into the recording material, and irradiation of the first light beam and the second light beam to an arbitrary point on the recording material is conducted in the above-mentioned order.
    Type: Grant
    Filed: March 6, 1989
    Date of Patent: February 5, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Akira Wada