Method of manufacturing a die for use in molding glass optical elements having a fine pattern of concavities and convexities
US5405652A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1993 |
| Grant date | Apr 11, 1995 |
| Priority date | — |
| Expiry date | Jul 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/08
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of manufacturing glass optical elements such as gratings, microlenses, Fresnel lenses, optical disks with pregrooves, and the like includes heating a glass plate to a temperature higher than the softening point of the glass and then press-molding the glass using upper and lower dies. The upper die includes a base made of a hard metal and a work layer made of a noble metal alloy which has been sputtered on a press plane of the base through a mask. The mask has a fine aperture pattern such as a line and space pattern corresponding to the fine pattern of concavities and convexities which is to be formed at the surface of the glass optical element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.