Hypercentric lens assembly with high numeric aperture aspheric element
US9274323B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 2014 |
| Grant date | Mar 1, 2016 |
| Priority date | — |
| Expiry date | Nov 24, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging hypercentric lens assembly comprising of a First Lens Group that includes: 1) At least a first high NA (0.40 or greater) aspheric lens element followed by 2) at least a second lens element that converges the light emitted from the first element to a small spot. It is further comprised of a Second Lens Group whose entrance pupil is placed at the same position as said small light spot. The Second Lens Group serves to refocus the light and form an image of an object placed in front of the First Lens Group. In this combination, the present invention allows high NA aspheric lens elements to produce good quality images of objects whose size is not limited to being considerably smaller than the diameter of the clear aperture of the high NA aspheric lens element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.