G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 7/24 (2006.01) G11B 7/0045 (2006.01) G11B 7/005 (2006.01) G11B 7/0055 (2006.01) G11B 7/244 (2006.01)
Patent
CA 2048721
A method for recording and reproducing information using an optical memory device being constituted by a trans- parent substrate, a recording film formed on the substrate and made of a resin containing a photochromic material dispersed therein, the photochromic material being capable of reversibly changing its state from achromatic to chromat- ic and absorbing light of at least 780 nm wavelength in the chromatic state, and a reflecting film formed on the record- ing film for reflecting light, the method including the steps of: applying a visible light beam of a long wavelength onto the optical memory device to turn said recording film into the achromatic state for initialization, applying thereafter a visible light beam of a short wavelength onto the optical memory device to turn the re- cording film into the chromatic state in accordance with binary-coded data of information for recording the informa- tion, and applying another visible light beam of a long wave- length having a light intensity lower than that of the visible light beam for initialization onto the optical memory device for reproducing the information having been recorded therein.
Ishikawa Toshio
Ohta Kenji
Van Kazuo
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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