Apparatus for discriminating optical recording media of differen

Details Apparatus for discriminating optical recording media of differen Apparatus for discriminating optical recording media of differen

1996-07-30

1999-06-29

Huber, Paul W.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369112, G11B 390, G11B 700

Patent

active

059177918

ABSTRACT:
An apparatus for discriminating optical disks has an optical pickup provided with an objective lens having an effective numerical aperture of 0.55 to 0.65, which can compatibly reproduce information from a CD and an SD. The apparatus discriminates presence/absence of waveforms of two focus error signals detected when the effective numerical aperture of the objective lens is set at 0.55 to 0.65 and 0.20 to 0.45 respectively in a process of performing focus servo control, thereby discriminating various types of optical disks from each other. Thus, optical disks having different substrate thicknesses, different track pitches, different minimum pit lengths and different reflectivity can be quickly and simply discriminated from each other.

REFERENCES:
patent: 5003521 (1991-03-01), Yoshida et al.
patent: 5235581 (1993-08-01), Miyagawa et al.

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