Method and apparatus for controlling a spindle servo using picku

Details Method and apparatus for controlling a spindle servo using picku Method and apparatus for controlling a spindle servo using picku

1987-05-06

1990-03-13

Psitos, Aristotelis M.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

360 7303, 369 32, G11B 700

Patent

active

049088106

ABSTRACT:
A method of initiating a spindle servo for use in an apparatus which reproduces signals from a video disk. When a spindle servo control loop is opened, a spindle motor is controlled according to a spindle information of a pickup in the radial direction of the disk and according to a shift direction information of the pickup. After the control loop is closed, a difference is detected between the frequency of a regenerative synchronizing signal and a reference synchronizing signal and the spindle motor is controlled according to the frequency difference. When the frequency difference has come down below a predetermined level, the phase difference between the regenerative synchronizing signal and the reference synchronizing signal is detected and the spindle motor is controlled in accordance with the detected phase difference.

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patent: 4646280 (1987-02-01), Toyosawa
patent: 4672595 (1987-06-01), Senso
patent: 4675855 (1987-06-01), Iso et al.
patent: 4698695 (1987-10-01), Kosaka et al.
patent: 4748608 (1988-05-01), Matsumoto et al.

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