Master disc for an optical disc and method for manufacturing the

Details Master disc for an optical disc and method for manufacturing the Master disc for an optical disc and method for manufacturing the

1995-10-23

1998-01-06

Evans, Elizabeth

Stock material or miscellaneous articles

Composite

Of quartz or glass

428642, 428644, 428913, 430320, 430321, 430322, 430945, 369116, 369121, B32B 300

Patent

active

057052468

ABSTRACT:
An exposure master disc includes a photoresist laminate formed on a glass substrate. The photoresist laminate includes an i-line type, first photoresist layer and a g-line type, second photoresist layer consecutively formed on the substrate. The photoresist laminate is exposed by a scanning laser light while selecting the exposure power level, to thereby effectively expose the first and second photoresist layers or to effectively expose only the second photoresist layer. The resultant photoresist laminate has first pits revealing the substrate and second pits revealing the first photoresist layer, thereby forming two types of pits having different depths. Two type of pits and flat surface of the photoresist laminate provide three-valued data for a higher storage density.

REFERENCES:
patent: 4732844 (1988-03-01), Ota et al.
S. Katsuda, et al., "High-density optical disk mastering using UV light source," Optical Data Storage '94, May 1994.
S. Katsuda et al., "Quadrupled Compact Disk-Read Only Memory Fabricated Using UV Light Source," JPN. J. Appl. Phys., vol. 32 (1993) pp. 5581-5583.
Patent Abstracts of Japan, vol. 014, No. 183 (P-1035), Apr. 12, 1990.

Affiliated with

Also associated with

Rating

Master disc for an optical disc and method for manufacturing the does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Master disc for an optical disc and method for manufacturing the, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Master disc for an optical disc and method for manufacturing the will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2327359