Focusing leveling device
US9857702B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 2014 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | Jan 13, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F9/7034
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A focusing and leveling apparatus, including: an illumination light source (201) for emanating a light beam; an illumination lens group (202), a projecting unit, an object (209) being measured, a detecting unit, a refractive unit, a relay lens group and a photoelectric detector (220), disposed sequentially in this order in a transmission path of the light beam. The projecting unit includes projection slits (203) defining a plurality of non-linearly arranged marks, such that after passing sequentially through the illumination lens group (202), the projecting unit, the object (209) being measured and the detecting unit, the light beam emanated by the illumination light source (201) becomes a plurality of non-linearly arranged sub-beams corresponding to the plurality of marks. The refractive unit is so configured that after passing through the refractive unit, the plurality of sub-beams form a plurality of linearly arranged light spots.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.