Spindle motor control system for use in an optical disk player

Details Spindle motor control system for use in an optical disk player Spindle motor control system for use in an optical disk player

1997-02-13

1998-11-10

Dinh, Tan

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

388815, G11B 509

Patent

active

058354638

ABSTRACT:
In the case where a CPS unit (9) detects a period of clock components of reproduction data to be within a given range, the spindle motor (8) is driven in the CLV mode in stable and the mean value or the low-frequency components of the drive signal data (Smd) during a given time period is stored in the memory unit (11), and in the meanwhile, when the clock components of the reproduction data can not be extracted, the spindle motor is driven in accordance with the mean value or low-frequency components stored in the memory unit. In the case where the reproduction data per se including the clock signal components for use in the CLV control is not obtained due to cracks and stains on the optical disk or due to external shock or vibrations applied from the outside, the stable rotation of the optical disk can be maintained for reproducing the data without causing undesirable burst rotation of the optical disk.

REFERENCES:
patent: 4710827 (1987-12-01), Okita
patent: 4727530 (1988-02-01), Tomisawa
patent: 4866695 (1989-09-01), Suzuki et al.
patent: 5243587 (1993-09-01), Itoh et al.
patent: 5377295 (1994-12-01), Ueda et al.
patent: 5420841 (1995-05-01), Hwang
patent: 5590105 (1996-12-01), Enami et al.
patent: 5666341 (1997-09-01), Horibe et al.

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