Method and apparatus for determining an optical disc type

Details Method and apparatus for determining an optical disc type Method and apparatus for determining an optical disc type

1996-03-06

1998-01-20

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

G11B 700

Patent

active

057107491

ABSTRACT:
A method and apparatus for determining an optical disc type. A light beam is directed at an optical disc, and a focal point of the light beam moves in a focus direction with respect to the optical disc. An intensity of a reflection of the light beam from the optical disc is detected during the movement of the focal point of the light beam. A time interval between occurrences of a plurality of peaks of the detected intensity of the reflected light beam is detected, and the optical disc type is determined according to the detected time interval.

REFERENCES:
patent: 5390160 (1995-02-01), Sasaki
patent: 5428592 (1995-06-01), Endo
patent: 5452279 (1995-09-01), Yokota et al.

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