Optical reproducing device, optical reproducing method using the

Details Optical reproducing device, optical reproducing method using the Optical reproducing device, optical reproducing method using the

1994-03-07

1997-03-11

Hindi, Nabil

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

3692752, G11B 709

Patent

active

056108796

ABSTRACT:
A record medium according to the present invention includes a substrate having concave or convex information pits and a thermosensitive material film formed on the substrate. The thermosensitive material film is changed from a high reflectance state to a low reflectance state when its temperature becomes a high level and returns to the high reflectance state when its temperature decreases to a low level. In the case where information is reproduced, when a light beam having a predetermined power is irradiated to the record medium, heat generated by the light beam is confined in the pits and the temperature in the pits increases; the thermosensitive material on the pits becomes the low reflectance state. The flat portions between the pits has high heat radiation and thus, the temperature in the flat portions does not increase so much; therefore, the state of the thermosensitive material film on the flat portions is not changed. Thus, an optical power of reflected light from the pits to which a light beam is irradiated is decreased, so that an amplitude of a reproduced signal is increased.

REFERENCES:
patent: 4332022 (1982-05-01), Ceshkovsky et al.
patent: 5024927 (1991-06-01), Yamada et al.
patent: 5194363 (1993-03-01), Yoshioka et al.
patent: 5230973 (1993-07-01), Yoshioka et al.
patent: 5249175 (1993-09-01), Akahira et al.
patent: 5291470 (1994-03-01), Yamaguchi et al.
patent: 5305297 (1994-04-01), Nishiuchi et al.
patent: 5305303 (1994-04-01), Akahira et al.
patent: 5341349 (1994-08-01), Kajami et al.
patent: 5341358 (1994-08-01), Kobayashi et al.
patent: 5346740 (1994-09-01), Ohno et al.
patent: 5390162 (1995-02-01), Fukumoto et al.
patent: 5432774 (1995-07-01), Fukumoto et al.
patent: 5450387 (1995-09-01), Ono et al.

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