Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1996-02-21
1997-03-11
Epps, Georgia Y.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4424, 369 4423, 369118, G11B 7135
Patent
active
056108958
ABSTRACT:
An optical head includes a lens system forming light reflected from an optical disk into parallel rays, a focal error and tracking error detection system detecting focal error and tracking error based on the parallel rays, an optical reproduced signal detection system detecting a reproduced signal reproduced from the optical disk based on the parallel rays, and a light blocking part for blocking, out of the parallel rays, at least a central portion in a light amplitude distribution of parallel rays supplied to the optical reproduced signal detection system.
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patent: 5349592 (1994-09-01), Ando
patent: 5450237 (1995-09-01), Yoshida et al.
Yamanaka, et al., "High Density Recording by Superresolution in an Optical Disk Memory System," Applied Optics, vol. 29, No. 20, pp. 3046-3051, Jul. 10, 1990.
Izumi Haruhiko
Miyabe Kyoko
Chu Kim-Kwok
Epps Georgia Y.
Fujitsu Limited
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