Disc substrate used for an optical disc and a molding die for molding the same
US5827593A · kind A · utility
29Cited by
4References
5Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Dec 17, 1996 |
| Grant date | Oct 27, 1998 |
| Priority date | — |
| Expiry date | Dec 17, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/21
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A disc substrate inject-molded comprises; a first circular surface having an inner non-data region formed around a center hole thereof and an outer data region formed around the non-data region; a second circular flat surface opposite and parallel to the first circular surface; and a ring shaped stack-rib formed on the non-data region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.