Optical reproduction apparatus
US5686227A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 28, 1996 |
| Grant date | Nov 11, 1997 |
| Priority date | — |
| Expiry date | Jun 28, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/146
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The object of the present invention is to provide an optical disc, a method of manufacturing thereof and an optical reproduction apparatus including the same 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 <2G 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 opti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.