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Optical information recording medium which uses diffraction grating
| Details |
Inventors: Toda, Toshiki; Takahashi, Susumu; Iwata, Fujio;
Assignee: Toppan Printing Co., Ltd. (Tokyo, JP)
Primary Examiner: Dinh; Tan
Assistant Examiner:
Attorney, Agent or Firm: Burns, Doane, Swecker & Mathis, LLP
In an optical information recording medium of this invention, at least one cell including diffraction gratings is disposed on a planar substrate. This cell is divided into n (n is an integer of 2 or more) regions such that each divided region represents one binary data. To read information, light-receiving elements corresponding in number of the number n of divided regions of the cell are disposed to correspond to the respective divided regions. One incident light beam is caused to be incident on the cell. Diffracted light components emerging from the respective divided regions of the cell are received by the 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. |
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DETAILED DESCRIPTION We claim: 1.
An optical information recording medium characterized in that at least one cell comprising diffraction gratings is disposed on a planar substrate, and said cell is divided along two dimensions into n (n is an integer of not less than 2) regions such that each divided region represents one binary data.
2.
An optical information recording medium according to claim (1), characterized in that a cell comprising diffraction gratings having at least either different azimuth angles or different grating pitches and formed in said divided regions is used as said cell.
3.
An optical information recording medium according to claim (1), characterized in that a cell comprising diffraction gratings which are obtained by aligning curved gratings parallel to each other to have constant grating pitches is used as said cell.
4.
An optical information recording medium according to claim (1), characterized in that a cell comprising diffraction gratings which are obtained by aligning curved gratings parallel to each other to have different grating pitches is used as said cell.
5.
An optical information recording medium according to claim (1), characterized in that a cell comprising diffraction gratings which are obtained by aligning concentric circles at a predetermined gap is used as said cell, and said cell is divided into n regions by lines extending through the center of the concentric circles such that each divided region represents one binary data.
6.
An optical information recording medium according to claim (1), characterized in that a cell comprising diffraction gratings which are obtained by aligning concentric circles at different gaps is used as said cell, and said cell is divided into n regions by lines extending through the center of the concentric circles such that each divided region represents one binary data.
7.
An optical information recording medium according to claim 1, wherein either a reflection type cell or a transmission type cell is used as said cell
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I/O Systems 
