Optical disc player with molded diffractive optical elements
US5825741A · kind A · utility
8Cited by
31References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Jul 10, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7224
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of fabricating a diffractive optical element includes the steps of: etching a negative of a desired multi-level diffraction pattern onto a molding surface of a quartz master element using photolithography, assembling the master element as a portion of a mold,and injecting a plastic molding composition into the mold and against the molding surface of the master element to injection mold a diffractive optical element whereby the optical element has the desired diffraction pattern on its surface. The diffraction pattern is preferably formed on the quartz master using VLSI photolithography.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.