Method of optical disc discrimination

Details Method of optical disc discrimination Method of optical disc discrimination

2008-03-25

2008-03-25

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S112030, C369S053240

Reexamination Certificate

active

10904879

ABSTRACT:
A method for discriminating between different types of optical discs is intended to apply to an optical storage device with a pick-up head having three beams. A main beam push-pull signal and a sub-beam push-pull signal, both acquired by means of the photo-detector of the pick-up head, are superposed on each other to have an additive push-pull signal, whereas, on subtraction, the difference between the main beam push-pull signal and the sub-beam push-pull signal generates a differential push-pull signal. If the peak-to-peak voltage of the differential push-pull signal is greater than that of the additive push-pull signal, it is judged that the light spots derived from the sub-beams and the main beam of the three beams respectively fall on two contiguous lands and a groove therebetween on an optical disc inside the optical storage device. Also, if the peak-to-peak voltage of the differential push-pull signal is smaller than that of the additive push-pull signal, it is judged that the light spots derived from the sub-beams and the main beam separately fall on three contiguous grooves on the optical disc respectively.

REFERENCES:
patent: 2002/0176342 (2002-11-01), Worthington et al.
patent: 2003/0080274 (2003-05-01), Izumi et al.
patent: 2003/0095486 (2003-05-01), Furuichi et al.
patent: 2004/0130986 (2004-07-01), Minase et al.
patent: 2004/0184376 (2004-09-01), Ishibashi et al.
patent: 2005/0185539 (2005-08-01), Shimano et al.

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