Dual mode recording and reproducing apparatus having two recordi

Details Dual mode recording and reproducing apparatus having two recordi Dual mode recording and reproducing apparatus having two recordi

1994-06-08

1997-01-07

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 50, 369 54, 369 58, G11B 700

Patent

active

055924468

ABSTRACT:
A recording and/or reproducing apparatus for a disc shaped recording medium having a first recording region in which an information signal is recorded using pits and a second recording region in which an information signal is recorded using a magneto-optical method includes a rotational driving unit, a servo apparatus and a controller. A head moves between the first and second recording regions of the disc-shaped recording medium and records and reproduces information signals to and from the disc-shaped recording medium. The rotational driving unit rotates the disc-shaped recording medium at a constant linear velocity by using the output signal outputted from the head. The servo apparatus generates a servo signal according to an error signal generated using the output signal from the head and carries out servo control on the head and the rotational driving unit. The controller determines which of the first or second regions of the disc-shaped recording medium the head is in based on the output signal from the head and then uses this determination result to control the servo apparatus.

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