Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-03-27
2009-08-11
Agustin, Peter Vincent (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S053220
Reexamination Certificate
active
07573788
ABSTRACT:
An optical disk unit of this invention includes a defocus detecting system for detecting a defocus of an objective lens, a thickness unevenness detecting system for detecting a thickness unevenness of a transparent resin layer provided nearest the objective lens of a recording medium, and a thickness unevenness correcting mechanism for changing the focusing characteristic of light impinging upon the objective lens based on a change in the thickness of the transparent resin layer detected by the thickness detecting system.
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Hideo Ando; “Preventing Coma Aberration by Annular Apodizer for Optical Disk Tilting”; Japanese Journal of Applied Physics; vol. 38; 1999; pp. 775-766; Part 1, No. 2A; p. 764; Appendix A.
Agustin Peter Vincent
Kabushiki Kaisha Toshiba
Pillsbury Winthrop Shaw & Pittman LLP
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