Disk discrimination method and device

Details Disk discrimination method and device Disk discrimination method and device

1997-10-30

2000-08-29

Edun, Muhammad

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4427, 369112, G11B 700

Patent

active

06111832&

ABSTRACT:
An optical disk has a reflecting layer and a transparent substrate formed on the reflecting layer. The type of the optical disk changes depending on the physical characteristics of the reflecting layer and the thickness of the transparent substrate. When discriminating such a disk, an objective lens which focuses an optical beam on the disk is moved toward the disk. Along with this movement, a detection signal that detects an optical beam reflected by the disk generates a detection signal. First, a peak accompanying mirror surface reflection of the surface of the disk appears, and then a peak accompanying reflection of the reflecting layer appears. The type of the disk which concerns the transparent substrate of the optical disk is discriminated from the time interval between the two peaks. The characteristics and reflection level of the RF component of detection signal generated by the detector change in accordance with the count of reflecting layers and the reflectance of the reflecting layer(s). This discriminates the physical characteristics of the reflecting surface and the type of the optical disk. In this manner, with the disk type discrimination method and device according to the present invention, discrimination can be performed within a substantially constant, short period of time after the disk is set in the device until the disk is recognized.

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patent: 5856965 (1999-01-01), Tsuchiya et al.
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Patent Abstracts of Japan, vol. 017, No. 366 (P-1571), Jul. 9, 1993 & JP 05 054406 A (Matsushita Electric Ind Co Ltd), Mar. 5, 1993.
Anonymous: "Detection of Optical Disk Type", IBM Technical Disclosure Bulletin, vol. 29, No. 3, Aug. 1986, pp. 995-999, XP002092918 New York, US, *the whole document*.
Patent Abstracts of Japan, vol.097, No. 012, Dec. 25, 1997 & JP 09 219056 A (Hitachi LTD), Aug. 19, 1997.

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