Optical lens system and position measurement system using the same
US7274461B2 · kind B2 · utility
3Cited by
5References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 17, 2004 |
| Grant date | Sep 25, 2007 |
| Priority date | — |
| Expiry date | Aug 7, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/001
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical lens system includes a lens surface capable of forming concentric interference patterns on an object as if light emitted from a single light source were virtually emitted from two or more light sources within a plane containing an optical axis of the single light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.