Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1993-10-26
1995-08-29
Young, W. R.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369 32, 369 4429, 369 4432, G11B 7085
Patent
active
054467136
ABSTRACT:
An optical pickup is provided with a slider for transporting the optical pickup in a direction of crossing a track on an optical disk, and a tracking unit mounted on the slider movably in the direction of crossing the track. A rough seeking mode to access a desired track on the optical disk at a high speed is set as one operation mode of the optical pickup. The drive control apparatus for the optical pickup includes: a slider transferring speed detecting device for detecting a transferring speed of the slider; a track crossing speed detecting device for detecting a track crossing speed when the slider crosses the track, the track crossing speed being prescribed by a sum of the transferring speed of the slider and a relative speed of the tracking unit with respect to the slider including a vibrating component of the tracking unit; a vibrating component extracting device for extracting the vibrating component of the tracking unit by subtracting the detected transferring speed of the slider from the detected track crossing speed in the rough seeking mode, and for outputting a vibrating component signal indicating the extracted vibrating component; and a loop for feeding back the vibrating component signal to the tracking unit in the rough seeking mode.
REFERENCES:
patent: 4562562 (1985-12-01), Moriya et al.
patent: 4866687 (1989-09-01), Kasai et al.
patent: 4930114 (1990-05-01), Tateishi
patent: 5054013 (1991-10-01), Kawamura
patent: 5063549 (1991-11-01), Yamamuro
patent: 5182736 (1993-01-01), Yanagi
Pioneer Electronic Corporation
Tran Thang V.
Young W. R.
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