Method and apparatus for optical data storage

Details Method and apparatus for optical data storage Method and apparatus for optical data storage

2005-04-12

2005-04-12

Edun, Muhammad (Department: 2655)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S053100, C369S059250, C369S047100

Reexamination Certificate

active

06879556

ABSTRACT:
An optical disk (10) includes several tracks (21-23, 121-125) that each include a series of optical data elements (29, 39). Each optical data element includes several reflective surfaces (31-34, 41-44) with respective different orientations that represent stored information. A detection system (210) directs a beam from a laser (217) onto successive optical data elements. The multiple reflective surfaces of each optical data element produce multiple reflected sub-beams that are imaged onto respective portions of a detector (219, 501, 541). The position of each sub-beam on the corresponding portion of the detector is determined, to thereby identify the orientation of the corresponding reflective surface and thus the stored information represented by that surface.

REFERENCES:
patent: 5493545 (1996-02-01), Matsumoto
patent: 5875170 (1999-02-01), Tompkin et al.
Howe, Dennis G., “RLL Modulation for Multi-level Recording”, Optical Sciences Center, University of Arizona, Tucson, Arizona, Jul. 20, 1999, pp. 1-14.
Spielman, S., et al. “Using pit-depth modulation to increase capacity and data transfer rate in optical discs”, Calimetrics, Inc., Alameda, California, date unknown, 10 sheets.
Wong, Terrence L., et al., “Multilevel Optical Recording”, Calimetrics, Inc., Alameda, California, date unknown, 10 sheets.

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