Disc recording and/or reproduction apparatus and method thereof

Details Disc recording and/or reproduction apparatus and method thereof Disc recording and/or reproduction apparatus and method thereof

1997-10-24

2000-06-06

Edun, Muhammad

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 54, 369 47, G11B 700

Patent

active

060727586

ABSTRACT:
In accordance with the invention, an apparatus and method are provided in which it is possible to determine a type of disc which has been loaded before servoing is locked. A disc is rotated by a spindle motor, and a pickup is gradually moved toward the disc from a position spaced apart from the disc. A peak value of an obtained reflection is detected by a peak hold circuit is stored into a CPU. If the disc is a DVD (by way of example), a single layer DVD has a reflectivity higher than that of a double layer DVD. Accordingly, a single layer DVD and a double layer DVD can be discriminated from each other from the value of the peak reflection value obtained by the peak hold circuit.

REFERENCES:
patent: 5003521 (1991-03-01), Yoshida et al.

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