公开(公告)号：JPH1050014A

公开(公告)日：1998-02-20

申请号：JP12360197

申请日：1997-05-14

Applicant: IBM

Inventor： CHAINER TIMOTHY JOSEPH ,  MAAKU DERORUMAN SUKARUTSU ,  BATSUKUNERU CHIYAPUMAN UEBU ,  EDOWAADO JIYON YARUMUCHIYAKU

IPC: G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B21/08 ,  G11B21/10 ,  G11B27/30

Abstract: PROBLEM TO BE SOLVED: To reduce the necessity of a complicated positioning system by preventing a 1st track from being immediately precedent to a 2nd track at the time of writing a 2nd propagation burst in the 2nd track while control is performed to a 1st propagation burst. SOLUTION: When a min. moving distance exceeds a servo track interval, this is attained by combining a larger forward moving step and a smaller backward moving step of propagation of a head than that shown in the figure. In each step with a dotted line in the figure shows for a self-servo writing process that the head is servo-controlled to the 1st propagation burst and is in a point of writing the 2nd propagation burst. A product servo pattern is shown as a continuous vertical line of data on the left side of the figure. The propagation bursts are shown with labels n, n+1,... in the middle. At the step 1, the propagation burst n is written, whereas the propagation burst n+2 is written by subsequent servo control on outer side edge of the burst (n).

公开(公告)号：JPH1069742A

公开(公告)日：1998-03-10

申请号：JP17736697

申请日：1997-07-02

Applicant: IBM

Inventor： TIMOTHY CHIEINAA ,  MARK DEROOMAN SHIYURUTSU ,  BATSUKUNERU CHIYAPUMAN UEBU ,  EDWARD JOHN YAAMUCHIYATSUKU

IPC: G11B21/10 ,  G11B5/596

Abstract: PROBLEM TO BE SOLVED: To minimize an error by optimizing at least one operating parameter in a self servo writing system using a measured mark and whereby reducing the error introduction into positional information written after that. SOLUTION: A read back signal from a reading control electronic system 29 is fed to an amplitude demodulator circuit 34, and the amplitude is converted into a digital value with an A/D converter 36 at the time of being determined with a sequence controller 33 and timing controller 32. The output is fed to an analog divider 40 and the signal is divided by a normalized value stored in a memory 38. The output of the analog divider 40 is inputted into a subtracter 42 and subtracted from the reference value taken out of the memory 38 to make a positional error signal PES. The signal PES is inputted into a servo controller 44, converted into a suitable regulation control signal, converted into analog with a D/A converter 46 and amplified, applied to an actuator 24, and a recording converter 22 is approximately transferred in the radial direction with respect to a recording medium 26 with the signal PES.