Apparatus for recording and/or reproducing information and/or fr

Details Apparatus for recording and/or reproducing information and/or fr Apparatus for recording and/or reproducing information and/or fr

1999-05-27

2000-06-20

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 50, 369 54, 369 725, G11B 700

Patent

active

060785500

ABSTRACT:
An apparatus for recording and/or reproducing information on and/or from a magneto-optical disk including an optical head for projecting a laser beam onto a magneto-optical disk and receiving the laser beam reflected by the disk, an up-down block arranged movably between a lower position and an upper position, an up-down motor for moving said up-down block up and down, a turntable for supporting the disk and a spindle motor secured to said up-down block and having a driving shaft coupled with said turntable for rotating the turntable, a position detecting device for detecting a position of said up-down block to derive a position signal when the up-down block is driven into the upper position, a rotation detecting device for detecting a rotation of said optical information record disk to derive a rotation signal when the optical information record disk is rotated at a predetermined revolving speed, and a control device for initiating a focus control for moving said objective lens and turntable relative to each other in accordance with said position signal and rotation signal.

REFERENCES:
patent: 4850695 (1989-07-01), Mikuriya et al.
patent: 4882723 (1989-11-01), Van Rosmalen
patent: 4918678 (1990-04-01), Dolby
patent: 5414687 (1995-05-01), Ohmuri et al.
patent: 5446711 (1995-08-01), Yamamiya
patent: 5917785 (1999-06-01), Masaki et al.

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