Phase-change type optical disk

Details Phase-change type optical disk Phase-change type optical disk

1999-01-19

2000-05-16

Dinh, Tan

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

428 644, 43027013, G11B 724

Patent

active

06064642&

ABSTRACT:
A first dielectric layer, a second dielectric layer, a third dielectric layer, a recording layer, a fourth dielectric layer, and a reflective layer are provided in that order on a substrate to constitute a phase-change type optical disk. The first dielectric layer, the second dielectric layer, and the third dielectric layer are constructed to satisfy the relationships: n1>n2 and n3>n2 wherein n1 represents the refractive index of the first dielectric layer, n2 represents the refractive index of the third dielectric layer, n3 represents the refractive index of the second dielectric layer. According to the above construction, the light reflectance of the amorphous area can be increased to lower the light absorption of the amorphous area, realizing inhibition of cross erasing. Further, since no light absorptive layer is present between the substrate and the recording layer, the temperature rise around the surface of the substrate can be inhibited to reduce the thermal deformation of the substrate. This can improve rewrite cycling properties.

REFERENCES:
patent: 5410534 (1995-04-01), Nagata et al.
patent: 5424106 (1995-06-01), Yamada et al.
patent: 5719006 (1998-02-01), Ohkubo

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