Optical disk thickness discriminating apparatus

Details Optical disk thickness discriminating apparatus Optical disk thickness discriminating apparatus

1996-07-25

1998-11-03

Hindi, Nabil

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 94, 369 4427, 369 4429, G11B 700

Patent

active

058319522

ABSTRACT:
An optical disk apparatus comprising a device for moving a focal point of a light beam for reproducing information recorded on an information face of a disk, in the direction perpendicular to the information face; a device for detecting a reflected light from the disk; and a device for discriminating whether the disk set in the apparatus is a disk having a thick base substrate or a disk having a thin base substrate. In this apparatus, a maximum value AS1L.sub.max of an output signal from the reflected light detecting device and a maximum value ENV.sub.max of an amplitude of an information reproducing signal are detected while driving the focal point moving device so that the focal point passes through the information face, and the discriminating device discriminates whether the disk set in the apparatus is a disk having a thick base substrate or a disk having a thin base substrate, on the basis of the ratio of ENV.sub.max to AS1L.sub.max. Therefore, it is possible to discriminate between a DVD having a thin base substrate and a CD having a thick base substrate.

REFERENCES:
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5446565 (1995-08-01), Komma et al.
patent: 5677903 (1997-10-01), Holtslag et al.

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