Optical element, optical element molding die, and method of molding the optical element
US5805361A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 15, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Jul 15, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B2215/72
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In the process of press molding an optical element having an optical functioning face having a grating which is rotationally asymmetric, both ends of an molding face of an lower press die are cut off to form inclined faces. During a press molding, glass material filled in the cuttings presses the inclined faces so that the rotation of a lower press die in an barrel die around an axis is prevented. In addition, the part filled in the cuttings is used as the reference point to mount on an optical apparatus. As a result, the rotation of the press dies is prevented, and the placement of the rotationally asymmetric optical functioning face is avoided. Therefore, the direction for mounting the optical element on an optical apparatus can be easily decided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.