Patents Examined by John Pokofylo
  • Disc cartridge
    Patent number: 5043974
    Abstract: A disc cartridge having a cartridge body in which a magneto-optical disc is rotatably accommodated in a hermetic-fashion so as to be capable of recording and/or reproduction. The cartridge body has a concave recessed portion extended from an insertion side end face of the cartridge body to a central portion of the cartridge body to allow the introduction of an external magnetic field generating means which generates an external magnetic field to record an information signal on the magneto-optical disc accommodated within the cartridge body.
    Type: Grant
    Filed: September 12, 1989
    Date of Patent: August 27, 1991
    Assignee: Sony Corporation
    Inventor: Kenzo Nakagawa