Objective optical element, optical pickup apparatus and...

Details Objective optical element, optical pickup apparatus and... Objective optical element, optical pickup apparatus and...

2005-08-22

2009-02-10

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112230

Reexamination Certificate

active

07489615

ABSTRACT:
An objective optical element for use in an optical pickup apparatus for recording and/or reproducing information on first—third optical information recording media using first—third light fluxes respectively, includes:a first phase structure for compensating a deterioration in a performance forming the converged spot on the information recording surface of the first optical information recording medium caused by an temperature change,a second phase structure for reducing a spherical aberration based on a thickness difference between the protective substrates of the first and second optical information media or the a wavelength difference between the first and second wavelengths, anda third phase structure for reducing a spherical aberration based on a thickness difference between the protective substrate of the first and third optical information media.

REFERENCES:
patent: 6418108 (2002-07-01), Ueda et al.
Kyu Takada, et al., “Blu-ray Disc / DVD Compatible Objective Lens Assembly”, “Technical Digest”, International Symposium on Optical Memory 2003 (ISOM 2003), Nov. 3-7, 2003 p. 230, 231.

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