Optical recording medium

Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier

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428913, 430270, 430945, 369283, 369288, 346137, 347264, B32B 300

Patent

active

054706289

ABSTRACT:
An optical recording medium has a mask layer 4, an intermediate dielectric layer 5, a recording layer 6, and a reflective layer 8 on a transparent substrate 2. The recording layer 6 contains a recording material which changes its crystallographic structure upon exposure to recording light for recording information. The mask layer 4 contains a mask material which increases its light transmittance when melted and has a complex refractive index (n.sub.0 -ik.sub.0), of which the real part n.sub.0 drops by 1.0 or less and the imaginary part k.sub.0 drops by 0.25-1.0 when the mask material converts from a crystalline state to an amorphous or microcrystalline state. Signals can be reproduced from the medium with high C/N without resorting to reading light of shorter wavelength or an optical pickup objective lens having a larger numerical aperture and even when the linear velocity of the medium relative to recording and reproducing light is low.

REFERENCES:
patent: 5018119 (1991-05-01), Aratani et al.
patent: 5147701 (1992-09-01), Furukawa
patent: 5153873 (1992-10-01), Spruit et al.
patent: 5389417 (1995-02-01), Tominaga
patent: 5418030 (1995-05-01), Tominaga
Optical Storage Readout of Nonlinear Disks; Bouwhuis et al; Applied Optics; Sep. 10, 1990; pp. 3766-3768.
Premastered Optical Disk by Superresolution; Yasuda et al; Optical Memory Symposium; 1993; pp. 65 & 66.
Magentically Induced Super Resolution in Novel Magneto Optical Disk; Aratani et al; Optical Data Storage; 1991; SPIE vol. 1499; pp. 209-215.

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