Patent ID: 7483235

Claim:
A position detecting circuit, in an information recording apparatus comprising a recording disk medium having more than one track with a servo area being formed and rotating at a prescribed speed and a head crossing each track over the recording disk medium on a prescribed trajectory and scanning each track by the rotation of the recording disk medium, for detecting a position of the head on the recording disk medium through a servo area of a track where the head is located during the rotation of the recording disk medium, comprising: a first detection timing generator unit to generate a first detection timing of a servo area in a track on the recording disk medium; and a second detection timing generator unit to generate a second detection timing in a track different from the track where the first detection timing is generated, in accordance with a rotation traveling time based on the speed of a rotation of the recording disk medium between the position of the servo area on the track at the first detection timing and the head position on the track, wherein a delay time from a rotation start of the recording disk medium to a servo pattern being read is obtained with respect to a radial position from a phase delay that a trajectory of the head by a rotary actuator causes with respect to a radial direction axis of the recording disk medium, and is reflected in a generated delay time of a servo gate signal used at servo reading; and a deviation of a timing to read information of the servo area occurring between tracks is corrected, consequently, a read timing of the servo area follows the head traveling between tracks, and accurate position information is detected in any track.