Mechanically-adjustable optical phase filters for modifying depth of field, aberration-tolerance, anti-aliasing in optical systems
US7180673B2 · kind B2 · utility
38Cited by
19References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 25, 2004 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | Mar 25, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/81
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical system with mechanical adjustment provides for the rotation and/or translation of one or more optical phase filters to variably select an extended depth of field, aberration-tolerance, and/or anti-aliasing properties of an optical imaging system. By adjusting the amount of phase induced on the wavefront, a user may select image quality selectively. The system may further automatically counter change of focus and/or aperture to maintain substantially constant image properties. Typically, two phase filters are used and moved concurrently to achieve desired image properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.