Optical data storage media

Details Optical data storage media Optical data storage media

1993-01-08

1995-08-29

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428913, 430270, 430945, 3401351, B23B 300

Patent

active

054458536

ABSTRACT:
The present invention is directed to an optical data storage medium in which a reflecting layer is formed on a substrate. A dye containing layer having a reflectivity of 15 to 25% is used as the reflecting layer, and a signal modulation degree of an information signal falls within a range of from 0.3 to 0.6. Further, a real number portion n of complex index of refraction of the reflecting layer is selected so as to satisfy n.gtoreq.1.84.
According to the present invention, there is provided an optical data storage medium which can be reproduced by a recording and reproducing apparatus which is designed so as to record and reproduce a medium such as a magneto-optical disc or the like having a reflectivity of about 15 to 25%. Therefore, the recording and reproducing apparatus that can record and reproduce the medium having the reflecting layer whose reflectivity is low can be made small in size and light in weight.

REFERENCES:
patent: 4873131 (1989-10-01), Kashima et al.
patent: 4996089 (1991-02-01), Saito et al.
patent: 5002812 (1991-03-01), Umehara et al.
patent: 5080946 (1992-01-01), Takagisi et al.
Patent Abstracts of Japan, vol. 16, No. 96 (P-1322), Mar. 10, 1992 & Jp-A-32 76 008, Dec. 6, 1991.
Patent Abstracts of Japan, vol. 9, No. 170 (P-373, Jul. 16, 1985 & JP-A-60 047 247, Mar. 14, 1985.

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