Optical information reproduction method and apparatus

Details Optical information reproduction method and apparatus Optical information reproduction method and apparatus

2008-04-22

2008-04-22

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053200, C369S053280

Reexamination Certificate

active

10986300

ABSTRACT:
In an optical information reproduction apparatus having optical beam sources having at least two types of wavelengths, an object lens may be damaged by colliding with an information recording medium while driving a focus servo, which is caused by a fake signal generated due to an incompatibility of the wavelength in use with the information recording medium. To solve such a problem, in case the type of the information recording medium is unrecognizable and a focus servo is led in by using the optical beam source having the first wavelength, the focus servo is led in by using the second focus servo lead-in unit which is driven by an output of a near focus point detection unit during an operation of a second focus search unit which renders the object lens move away from the information recording medium.

REFERENCES:
patent: 6104019 (2000-08-01), Yokota
patent: 2001/0030915 (2001-10-01), Suzuki
patent: 2005/0002286 (2005-01-01), Yonezawa et al.
patent: 1318830 (2001-10-01), None
patent: 2001-202632 (2001-07-01), None

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