Optical disk capable of inhibiting from rental use

Details Optical disk capable of inhibiting from rental use Optical disk capable of inhibiting from rental use

1997-04-30

2000-03-14

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692754, G11B 724

Patent

active

060382074

ABSTRACT:
A recording medium and technique which reduces problems relating to copyright, reduces the necessity for collecting an optical disk for, e.g., rental use and enables the optical disk itself to be inhibited from rental use. A reflectance of a reproducing film of the optical disk is changed by an irradiating laser beam having a greater strength than the laser beam strength used to form the film. The depth of a pre-pit in a data section is set to less than a quarter of the wavelength of the laser beam and the reproducing film is composed such that its reflectance drops if it is irradiated by the laser beam having the greater strength.

REFERENCES:
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patent: 4527173 (1985-07-01), Gupta et al.
patent: 4538159 (1985-08-01), Gupta et al.
patent: 4577306 (1986-03-01), Howe et al.
patent: 5304440 (1994-04-01), Ono et al.
Patent Abstracts of Japan, vol. 017, No. 457 (P-1597), JP 5-101471, Published Apr. 23, 1993.
Patent Abstracts of Japan, vol. 095, No. 004, JP 7-006368, Published Jan. 10, 1995.

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