Optical recording medium and method for forming same

Details Optical recording medium and method for forming same Optical recording medium and method for forming same

1995-10-18

1997-07-08

Ryan, Patrick

Stock material or miscellaneous articles

Circular sheet or circular blank

428 644, 428 645, 428 646, 428913, 43027012, 43027013, 4304951, 430945, 3692751, 3692752, 3692753, 3692754, 369283, B32B 300

Patent

active

056459092

ABSTRACT:
An optical recording medium for a land & groove recording method capable of suppressing crosstalk and cross-erase (increase of jitter) upon increasing the capacity by the increase of track density, wherein a depth for a groove is made greater than 60 nm, at least one of a protection layer, a recording layer and an interference layer is formed to a layer thickness different between the groove and the land, such that reflectance to an optical beam upon irradiation of the optical beam to a predetermined track comprising the land or the groove is equal with each other between a portion in a recorded state and a portion in a unrecorded state of an adjacent track adjacent with the predetermined track, and a land wall for one of the protection layer, the recording layer and the interference layer is made thinner than the thickness of the groove and the land or removed.

REFERENCES:
"Land & Groove Recording on Phase Change Optical Disk (3) Track pitch dependence;" K. Nishiuchi, et al.; pre-text 28p-L-5, 94 Spring Appl. Phys. Association, 1994.
"Land and Groove Recording for High Track Density on Phase-Change Optical Disks;" N. Miyagawa et al.; Jpn. J Appl. Phys. vol. 32 (1993) pp. 5324-5328.
"High Density Phase Change Optical Disks Using Land & Groove Recording Method;" E. Ohno et al., Proc. 93, 5th Phase Change Recording Mtg., (1993) pp. 114-119.
"Recording characteristics of a GeSbTe phase change optical disk using a 488 nm wavelength laser beam;" H. Yamazaki et al., Proc. '93 Symposium on Phase Change Optical Disks, (1993), pp. 75-80.
"High Density Optical Recording by Superresolution," Y. Yamanaka et al., Jpn. J. Appl. Phys. vol. 28, (1989), pp. 197-200.
"High Density optical disk with V-shaped grooves;" M. Nagashima, App.. Phys. Lett. 42(2), (1983), pp. 144-146.
"Suppression of Crosstalk by Control of Groove Depth in Recording on land and Groove" K. Miyagawa et al.; pre-text 18a-T-3, '92 Autumn Appl. Phys. Association (1992).

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