| 摘要 |
PCT No. PCT/JP93/01199 Sec. 371 Date Apr. 28, 1994 Sec. 102(e) Date Apr. 28, 1994 PCT Filed Aug. 26, 1993 PCT Pub. No. WO94/06113 PCT Pub. Date Mar. 17, 1994In 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 +E,uns n+EE (+E,uns n+EE 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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