Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2005-05-31
2005-05-31
Ometz, David L. (Department: 2655)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S112010, C369S118000, C369S044230
Reexamination Certificate
active
06901036
ABSTRACT:
An apparatus for reproducing information stored in an optical recording medium which comprises marks or pits which are arranged at a pitch less than λ/2NA, wherein λ is a wavelength of light used for reproduction and NA is an numerical aperture of an objective lens. The apparatus generally comprises a laser diode, a polarization beam splitter, an objective lens, beam splitters, a low-frequency light detecting system with a photodetector, a high-frequency light detecting system with a photodetector, and a signal processing circuit for combining detection signals from the photodetectors. In the high-frequency light detecting system, before a convergent lens, a shielding band is provided so as to shield the middle of a bundle of rays of reproduction light.
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High Density ROM Disc with Super-Resolution Reflective Layer TDK R&D Ctr. Kikukawa T., Kato T., et al. Extended Abstracts (the 47th Spring Meeting, 2000); the Japanese Society of Applied Physics and Related Societies (No. 28-p-R-2) (with English translation).
Atoda Nobufumi
Kikukawa Takashi
Kuiseko Manami
Nakano Takashi
Sato Akira
Minolta Co. , Ltd.
Morrison & Foerster / LLP
National Institute of Advanced Industrial Science and Technology
Ometz David L.
Ortiz-Criado Jorge L.
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