Position detector, position detection method, exposure apparatus, and method of manufacturing device to align wafer by adjusting optical member
US8810772B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 30, 2008 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | May 4, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F9/7092
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A position detector (16), configured to detect a position of a mark on an object to be detected, comprises an image pickup unit (34), an optical system, a noise obtaining unit (36) and a correction unit (38). The image pickup unit picks up an image of the object to be detected. The optical system forms an image of the object to be detected on an image pickup surface of the image pickup unit. The noise obtaining unit obtains noise information by picking up an image of a region other than the mark using the optical system and the image pickup unit in accordance with the result of adjustment of an optical member included in the optical system. The correction unit corrects, using the noise information obtained by the noise obtaining unit, the image of the mark obtained using the optical system and the image pickup unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.