Radiation imagery chemistry: process – composition – or product th – Combined
Patent
1995-01-20
1996-08-06
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Combined
43027011, 430945, 369112, G11B 724
Patent
active
055432719
ABSTRACT:
The object of the present invention is to provide an optical disc and a method of manufacturing thereof wherein defects and deterioration in the optical disc are minimized at the time of manufacture, during operation and storage thereof as well. The invention conceives an optical disc suitable for accomplishing the above object through specifications such as providing a cross-sectional structure thereof comprising a pair of transparent substrates each provided with at least one layer of a recording film formed on the surface of information patterns thereof, with the pair being bonded and laminated with an adhesive, and further providing an instantaneous axial acceleration <2 G measured at room temperatures, a skew angle <5 mrad measured at room temperatures, and a skew angle <5 mrad measured after being left for one hour as heated to 80.degree. C. (otherwise, a shear mass <20 .mu.m measured after being left for one hour as heated to 80.degree. C.), and still further by utilizing a reaction adhesive the hardness of which after cure is between A30 and A80 in Shore hardness. On the other hand, preferred methods of manufacturing optical discs suitable for implementing the object of the invention were set forth, which utilize reaction adhesives having a Shore hardness after cure between A30 and A80.
REFERENCES:
patent: 4799210 (1989-01-01), Wilson et al.
patent: 5189655 (1993-02-01), Ogata et al.
patent: 5214630 (1993-05-01), Goto et al.
patent: 5318653 (1994-06-01), Toide et al.
patent: 5401610 (1995-03-01), Miwa et al.
Koyama Eiji
Miwa Hiroaki
Sudo Ryoichi
Tajima Tetsuo
Bowers Jr. Charles L.
Hitachi , Ltd.
Hitachi Maxell Ltd.
McPherson John A.
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