Optical recording medium having a plurality of different diffrac

Details Optical recording medium having a plurality of different diffrac Optical recording medium having a plurality of different diffrac

1995-06-07

1997-04-29

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

369109, G11B 724

Patent

active

056256191

ABSTRACT:
In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. In accordance with exemplary embodiments, a ratio of a line width of the diffraction gratings to a grating pitch of the diffraction gratings is changed based on the data. To read information, an incident light beam is caused to be incident on the cell. Diffracted light components emerging from the cell are received by light receiving elements, thereby reproducing data. Thus, information can be recorded at a very high density, and information can be read at a high speed.

REFERENCES:
patent: 4847478 (1989-07-01), Sugiura
patent: 5007690 (1991-04-01), Chern et al.
patent: 5331626 (1994-07-01), Sugiura
patent: 5337301 (1994-08-01), Sugiura et al.
patent: 5359591 (1994-10-01), Nomoto
patent: 5400313 (1995-03-01), Belser et al.
patent: 5566387 (1996-10-01), DeWald
Patent Abstracts of Japan, vol. 17, No. 358, (M-1440), Jul. 7, 1993.

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