Stepped thickness spectral filter for focal plane flattening
US5002347A · kind A · utility
4Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 25, 1989 |
| Grant date | Mar 26, 1991 |
| Priority date | — |
| Expiry date | Aug 25, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01J2001/448
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A spectral filter for use in optical systems receiving field-of-view (FOV) optical beams at differing angles refracts all FOV beams onto a single plane focal surface. The spectral filter comprises a combination of lens having varied thicknesses incorporated into a single filter unit. Each thickness, or step, of the spectral filter corresponds to a different one of the received FOV beams.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.