Optical disk reproducing system


PURPOSE: To narrow the track pitch and to enhance the recording density and then to highly speed up the read of data by irradiating over two tracks with a light beam spot. CONSTITUTION: Scanning is performed when the center of the beam spot SP is positioned at a middle point between the tracks as under the just tracking state. A middle position between the tracks is irradiated by the spot SP. By this method, information by pots P on the tracks TK n and TK n+1 can be read out by scanning them in one revolution. As a result, the data read-out speed is approximately doubled. COPYRIGHT: (C)1991,JPO&Japio




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Cited By (4)

    Publication numberPublication dateAssigneeTitle
    US-6577560-B2June 10, 2003Fujitsu LimitedMagneto-optic recording medium in which magnetic partition tracks are removed for high track density
    US-7916617-B2March 29, 2011Koninklijke Philips Electronics N.V.Recognizable patterns in adjacent tracks of ROM record carriers for simultaneous scanning for copy protection
    WO-0101409-A1January 04, 2001Fujitsu LimitedSupport d'enregistrement magnetique et optique, procede et dispositif de reproduction d'un enregistrement magnetique et optique
    WO-2005119664-A1December 15, 2005Koninklijke Philips Electronics N.V.Record carrier comprising a rom mark and a playback device for retrieving the rom mark