Optical disc and optical system for reproducing the optical disc

Details Optical disc and optical system for reproducing the optical disc Optical disc and optical system for reproducing the optical disc

1994-03-08

1995-07-25

Popek, Joseph A.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692755, 369283, 369284, 369285, 36944437, 428 644, G11B 724

Patent

active

054368855

ABSTRACT:
An optical disc has a recording film with information recorded thereon, and a photochromic material film provided adjacent the recording film. The photochromic material film is made of a photochromic material. The photochromic material has a first state irradiated with reading light having a first wavelength. In the first state, the transmittance of the material is increased so as to enable reading of the recorded information. The photochromic material further has a second state irradiated with auxiliary light having a second wavelength, where the transmittance becomes low so as to disable the reading of the recorded information.

REFERENCES:
patent: 4841514 (1989-06-01), Tsuboi et al.
patent: 4893298 (1990-01-01), Pasman et al.
patent: 5061582 (1991-10-01), Brettle et al.
patent: 5235582 (1993-08-01), Taniguchi et al.
patent: 5252371 (1993-10-01), Taniguchi et al.

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