Dynamic information storage or retrieval – Storage medium structure – Optical track structure
Patent
1994-06-01
1996-08-20
Epps, Georgia Y.
Dynamic information storage or retrieval
Storage medium structure
Optical track structure
369121, 369112, G11B 700
Patent
active
055485766
ABSTRACT:
An optical recording medium from which data is reproduced by use of a light beam scanning the optical recording medium, the optical recording medium has a recording area on which marks each of which has an optical singularity are formed at a density so that a plurality of marks is included in a spot area of the light beam, an arrangement of the marks corresponding to the data to be recorded in the optical recording medium. Furthermore, the data reproducing apparatus has a signal output unit for receiving a reflected beam from the recording area onto which the light beam is projected, and for outputting a signal based on the reflected beam, the signal including information depending on a number of marks in the spot area of the light beam, and a signal processing unit for reproducing the data based on variation of the signal output from the signal output unit while the light beam is scanning the optical recording medium.
REFERENCES:
patent: 5257249 (1993-10-01), Rokutan
patent: 5278816 (1994-01-01), Russell
patent: 5394385 (1995-02-01), Sakurada et al.
patent: 5412635 (1995-05-01), Maeda
Matsumoto Koji
Shono Keiji
Tanaka Tsutomu
Epps Georgia Y.
Fujitsu Limited
Hindi Nabil
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