Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2006-11-07
2006-11-07
Patel, Gautam R. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S112030, C359S197100
Reexamination Certificate
active
07133332
ABSTRACT:
A light-converging optical system has an objective lens arranged at a position to be opposite to an optical information recording medium and including at least one plastic lens, and an aberration correcting element provided on an optical path between the light source and the objective lens and structured by two groups of a positive lens and a negative lens both being a plastic lens. At least one of the positive lens and the negative lens has at least one diffractive surface on which a diffractive structure is formed and a total paraxial power of the aberration correcting element has a temperature dependency satisfying a formula of:in-line-formulae description="In-line Formulae" end="lead"?PT1<PT0<PT2, or PT1>PT0>PT2,in-line-formulae description="In-line Formulae" end="tail"?where PT0, PT1and PT2are the total paraxial power (mm−1) of the aberration correcting element under the temperature of 25° C., −5° C. and 55° C. respectively.
REFERENCES:
patent: 5568197 (1996-10-01), Hamano
patent: 5838480 (1998-11-01), McIntyre et al.
patent: 6366542 (2002-04-01), Kojima et al.
patent: 2001-324673 (2001-11-01), None
patent: 2002-082280 (2002-03-01), None
patent: 2002-236252 (2002-08-01), None
Cohen & Pontani, Lieberman & Pavane
Konica Corporation
Patel Gautam R.
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