Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2007-10-16
2007-10-16
Korzuch, William (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112080
Reexamination Certificate
active
10473934
ABSTRACT:
An objective lens for converging a light beam emitted from a first light source on a recording surface (17a) of a first optical information recording medium covered with a transparent substrate (7a) and converging a light beam emitted from a second light source on a recording surface (17b) of a second optical information recording medium covered with a transparent substrate (7b) having a thickness greater than the transparent substrate (7a). On an incident plane for the light beam, there are formed a center region (A1), an intermediate region (A2) surrounding the center region (A1), and a peripheral region (A3) surrounding the intermediate region (A2). A diffraction grating (11) is provided on the lens surface of the intermediate region (A2). Between the intermediate region (A2) and the center region (A1), and also between the intermediate region (A2) and the peripheral region (A3), stepped portions (12) are provided for causing an advance or a delay of a phase of a light beam passing through the intermediate region (A2) with respect to the phases of the light beams passing through the center region (A1) and the peripheral region (A3). The stepped portions (12) are formed so that a value of a tertiary spherical aberration on the recording surface (17b) of the second optical information recording medium becomes a value that makes a jitter value of a reproduction signal from the second optical information recording medium not more than 15%.
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Official translation of WO 01/26104.
English abstract and machine translation of JP 2000-028917 A.
Hayashi Hideki
Kikuchi Atsuo
Mizuno Sadao
Danielsen Nathan
Hamre Schumann Mueller & Larson P.C.
Korzuch William
Matsushita Electric - Industrial Co., Ltd.
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