Optical disk apparatus which determines the type of optical...

Details Optical disk apparatus which determines the type of optical... Optical disk apparatus which determines the type of optical...

2006-01-31

2006-01-31

Huber, Paul W. (Department: 2653)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053370, C369S124100

Reexamination Certificate

active

06992961

ABSTRACT:
An optical disk apparatus capable of determining the type of a loaded optical disk. In accordance with an RF signal output from a pickup, an RF processing section of the optical disk apparatus generates a focus signal (an FOK signal), which is an envelope of the RF signal, and supplies the focus signal to a DSP. In the DSP, the level of the FOK signal is compared with a threshold value, and a result of comparison is supplied to a controller. The controller determines occurrence of defocus on the basis of the comparison result. Concurrently, the controller quantitatively evaluates the level of the FOK signal by means of sequentially changing the threshold value, thereby determining the type of the optical disk on the basis of the reflectivity of the optical disk.

REFERENCES:
patent: 5003521 (1991-03-01), Yoshida et al.
patent: 5289451 (1994-02-01), Ashinuma et al.
patent: 5966357 (1999-10-01), Ryoo
patent: 6249499 (2001-06-01), Andoh
patent: 6272087 (2001-08-01), Hirashima
patent: 6493304 (2002-12-01), Watanabe et al.
patent: 6744705 (2004-06-01), Sumida et al.
patent: 6816443 (2004-11-01), Hwang
patent: 6822936 (2004-11-01), Ono et al.
patent: 6853609 (2005-02-01), Kusumoto et al.
patent: 6879555 (2005-04-01), Takeuchi
patent: 61160838 (1986-07-01), None
patent: 6267181 (1994-09-01), None

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