Optical information recording medium and recording method

Details Optical information recording medium and recording method Optical information recording medium and recording method

1990-07-06

1992-01-14

Ryan, Patrick J.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 65, 428204, 428206, 428913, 430311, 430945, 346 76L, 3461351, 369272, 369284, 369286, 369288, B32B 302

Patent

active

050809466

ABSTRACT:
An optical information recording medium comprising a light transmitting substrate having a spiral pregroove formed on its surface, a light absorptive layer of a coloring matter formed on the substrate directly or with other layer interposed therebetween, and a light reflective layer made of a metal film formed on the light absorptive layer directly or with other layer interposed therebetween, wherein .DELTA.S.ltoreq.0.3 wherein .DELTA.S is the optical phase difference represented by .DELTA.S=2d.sub.sub {n.sub.sub -n.sub.abs (1-d.sub.abs /d.sub.sub)}/.lambda. wherein d.sub.sub is the depth of the layer boundary on the substrate side of the light absorptive layer at the portion corresponding to the pregroove, d.sub.abs is the depth of the layer boundary on the light absorptive layer side of the light reflective layer at the portion corresponding to the pregroove, n.sub.sub is the real part of the complex refractive index of the substrate and any layer present on the substrate side of the light absorptive layer, n.sub.abs is the real part of the complex refractive index of the light absorptive layer, and .lambda. is the wavelength of a laser beam.

REFERENCES:
patent: 4359750 (1982-11-01), Howe
patent: 4547875 (1985-10-01), Ohta et al.
patent: 4954380 (1990-09-01), Kanome et al.
Patent Abstracts of Japan, vol. 11, No. 362 (P-640) (2809), Nov. 26, 1987 & JP-A-62 137745 (Matsushita Electric Industrial Co. Ltd.), Jun. 20, 1987.

Affiliated with

Also associated with

Rating

Optical information recording medium and recording method does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical information recording medium and recording method, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical information recording medium and recording method will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-540395