Patent ID: 6069869
Filing Date: 2000-05-30
Classification: G11B

Abstract:
An optical disk drive device using an optical disk having information recording tracks in the form of land and groove tracks, said disk being divided into a plurality of annular zones, each revolution of said information recording track belonging to one of the zones depending on the position in the radial direction of the track,each revolution of the information recording track being divided into a plurality of sectors of a unit length of information recording in the direction of the scanning,said disk having a header portion at the head of each sector,said header portion including a recognition pattern which is formed of a sequence of pits having a pattern which is not used as a pattern for data or address in the information recording part, said header further including a VFO,said device comprising:means for generating a light spot and causing the light spot to scan along the track;means for receiving light reflected from the disk;means for reproducing a signal based on the reflected light;means responsive to the reproduced signal corresponding to the VFO, for generating PLL clock pulses;means for counting the clock pulses; andmeans for responsive to the result of the counting, for outputting a signal at a timing at which the light spot scans the wobbling address pits, or the mirror surface part.