Off-axial three-mirror optical system with freeform surfaces
US9268122B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 16, 2014 |
| Grant date | Feb 23, 2016 |
| Priority date | — |
| Expiry date | Dec 16, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B17/0642
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An off-axial three-mirror optical system with freeform surfaces includes a primary mirror, a secondary mirror, a tertiary mirror, and an image sensor. The primary mirror is located on an incident light path. The secondary mirror is located on a primary mirror reflecting light path. The tertiary mirror is located on a secondary mirror reflecting light path. The image sensor is located on a tertiary mirror reflecting light path. The primary mirror, the secondary mirror, and the tertiary mirror are all xy polynomial surfaces up to the sixth order. The off-axial three-mirror optical system with freeform surfaces can achieve push-broom image with small F-number and large field angles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.