Layered lens structures and methods of production in which radius of curvature of the upper lens can be varied
US7365305B2 · kind B2 · utility
1Cited by
17References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2006 |
| Grant date | Apr 29, 2008 |
| Priority date | — |
| Expiry date | Dec 20, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/0056
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A microlens structure includes lower lens layers on a substrate. A sputtered layer of glass, such as silicon oxide, is applied over the lower lens layers at an angle away from normal to form upper lens layers that increase the effective focal length of the microlens structure. The upper lens layers can be deposited in an aspherical shape with radii of curvature longer than the lower lens layers. As a result, small microlenses can be provided with longer focal lengths. The microlenses are arranged in arrays for use in imaging devices.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.