Optical pickup apparatus including collimator lens with...

Details Optical pickup apparatus including collimator lens with... Optical pickup apparatus including collimator lens with...

2005-04-25

2008-08-26

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044230

Reexamination Certificate

active

07417938

ABSTRACT:
Provided is an optical pickup apparatus which has a function for correcting spherical aberration caused by a thickness error of a transparent substrate and which is sufficiently compact, wherein a collimator lens used in the apparatus is composed of two lens groups, an interval between the two lens groups is changeable, and therefore spherical aberration caused by the thickness error of the transparent substrate is corrected.

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patent: 2001-216662 (2001-08-01), None
patent: 2002-236252 (2002-08-01), None
patent: WO 03/075266 (2003-09-01), None
Dec. 8, 2005 European Search Report in EP 05 25 2613.
Patent Abstracts of Japan, vol. 2000, No. 25, Apr. 12, 2001 (JP-A 2001-216662, Aug. 10, 2001).
Patent Abstracts of Japan, vol. 2002, No. 12, Dec. 12, 2002 (JP-A 2002-236252, Aug. 23, 2002).

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