Optical disc drive and objective lens for the same

Details Optical disc drive and objective lens for the same Optical disc drive and objective lens for the same

2006-09-28

2010-11-23

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112010

Reexamination Certificate

active

07839752

ABSTRACT:
There is provided an optical disc drive for recordation/reproduction for three types of optical discs by selectively using one of three types of light beams. The optical disc drive comprises an objective lens. The objective lens has a step structure which gives an optical path length difference to an incident beam at each step. When the third laser beam passes through the objective lens, the objective lens produces normal diffraction order light converging to a recording surface of the third optical disc and undesired diffraction order light converging to a point deviating from the recording surface of the third optical disc. A distance from a point to which the normal diffraction order light converges to a point to which the undesired diffraction order light converges is larger than or equal to twice a pull-in range of a focus error signal obtained when the third optical disc is used.

REFERENCES:
patent: 2004/0047269 (2004-03-01), Ikenaka et al.
patent: 2005/0270958 (2005-12-01), Ikenaka
patent: 2005/0281172 (2005-12-01), Wachi
patent: 2006/0114796 (2006-06-01), Maruyama et al.
patent: 8-240718 (1996-09-01), None
patent: 2004-247025 (2004-09-01), None
English Language Abstract of JP 2004-247025.
U.S. Appl. No. 11/456,943 to Koreeda et al., filed Jul. 12, 2006.
U.S. Appl. No. 11/419,810 to Koreeda et al., filed Mar. 23, 2006.
English Language Abstract of JP 8-240718.

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