Stock material or miscellaneous articles – Structurally defined web or sheet – Including variation in thickness
Patent
1989-02-09
1991-10-22
Robinson, Ellis P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Including variation in thickness
369284, 369286, 369288, 428 64, 428 65, 428 76, 428412, 428426, 430945, B32B 300
Patent
active
050594737
ABSTRACT:
An optical recording medium, which is used as an optical disc, optical card or the like for optically recording, reproducing, erasing and the like, includes a center substrate having formed on at least one side thereof recesses and/or protrusions. Recording films are formed on both sides thereof and transparent protective plates bonded to these recording films respectively. This arrangement substantially eliminates warping of the substrates constituting the optical recording medium and exfoliation of substrates or the like even when the optical recording medium is subjected to sudden changes in temperature. This optical recording medium demonstrates enhanced optical performance and protective effect. The selecting of the transparent protective plate is simplified because the forming recesses and/or protrusions is not a factor. By producing an optical recording medium utilizing the above features, the carrier-to-noise ratio and isotropy of the medium is improved.
REFERENCES:
patent: 4179532 (1979-12-01), Soeding
patent: 4268369 (1981-05-01), Barlow et al.
patent: 4363844 (1982-12-01), Lewis et al.
patent: 4544443 (1985-10-01), Ohta et al.
patent: 4731620 (1988-03-01), Yabe et al.
Reprinted from Applied Optics, vol. 27, pp. 2863-2866, Jul. 15, 1988, "Influence of Birefringence on the Signal Quality of Magnetoopics Disks Using Polycarbonate Substrates " by Akira Takashi, M. Mieda, Y. Murakami, K. Ohta, and H. Yamaoka.
Mieda Michinobu
Miyake Tomoyuki
Murakami Yoshiteru
Nakayama Junichiro
Ohta Kenji
Robinson Ellis P.
Sharp Kabushiki Kaisha
Weddington J.
LandOfFree
Optical recording medium and manufacturing method thereof 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 recording medium and manufacturing method thereof, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical recording medium and manufacturing method thereof will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-107453