Optical recording medium and read/write method therefor

Details Optical recording medium and read/write method therefor Optical recording medium and read/write method therefor

1998-08-10

2000-03-28

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428913, 43027013, 4304951, 430945, 3692751, 369283, 369288, B32B 300

Patent

active

060429216

ABSTRACT:
The invention provides a phase charge type optical recording medium comprising on both sides of a recording layer dielectric layers, each containing zinc sulfide and silicon oxide as main components. The medium comprises on a substrate 2 a first dielectric layer 31, a recording layer 4, a second dielectric layer 32 and a reflective layer 5 made up of a metal. The first dielectric layer 32 comprises a dielectric lamina 1a on a substrate 2 side thereof and a dielectric lamina 1b on a recording layer 4 side thereof. The dielectric lamina 1a has a silicon oxide content of 2 to less than 40 mol %, the dielectric lamina 1b has a silicon oxide content of 40 to 100 mol %, and the second dielectric layer 32 has a silicon oxide content of 2 to 50 mol % and a thickness of 10 to 35 nm. The number of overwritable cycles can be increased.

REFERENCES:
patent: 5976617 (1999-11-01), Hong et al.
patent: 5978349 (1999-11-01), Yoshinari et al.

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