Optical head device, and recording and/or reproducing device

Details Optical head device, and recording and/or reproducing device Optical head device, and recording and/or reproducing device

2008-05-29

2011-10-25

Agustin, Peter Vincent (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

08045426

ABSTRACT:
An object of the invention is to suppress an influence of a wavefront aberration which is generated at the time of correcting a third-order spherical aberration, and realize satisfactory information recording and/or reproducing. A collimator lens4corrects a third-order spherical aberration which is generated depending on the thickness of a light transmissive layer from a surface of a first optical information recording medium30, corresponding to an optimal substrate thickness of a first objective lens6, to an intended information recording surface, assuming that the light transmissive layer thickness of the first optical information recording medium30which minimizes a residual third-order spherical aberration at the time of incidence of parallel light into the first objective lens6is defined as the optimal substrate thickness of the first objective lens6. The optimal substrate thickness of the first objective lens6is defined in such a manner that a variation of a wavefront aberration which is generated on the information recording surface of the first optical information recording medium30farthest from the first objective lens6at the time of correcting the third-order spherical aberration, and a variation of a wavefront aberration which is generated on the information recording surface of the first optical information recording medium30closest to the first objective lens6at the time of correcting the third-order spherical aberration are set equal to each other.

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International Search Report issued Sep. 2, 2008 in International (PCT) Application No. PCT/JP2008/001347.
Noboru Murayama et al., “Optical Disk Technology”, published by Radio Technology Publications, Inc., Jan. 1989, p. 60 (along with partial translation).

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