The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 27, 2011
Filed:
Mar. 24, 2010
Kenta Sudo, Tokyo, JP;
Kenta Sudo, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An alignment device is provided for aligning a primary mirror with a secondary mirror in an optical system having the primary mirror and the secondary mirror arranged so as to face each other along the optical axis. The alignment device has a dichroic film formed on a surface on the front side of the secondary mirror and configured to reflect light used in the optical system and to transmit alignment light, a back reflecting surface formed on the back side of the secondary mirror and configured to reflect the alignment light, and a detection system which detects a positional deviation between the primary mirror and the secondary mirror, based on the alignment light having traveled via the dichroic film, the back reflecting surface, and a reflecting surface of the primary mirror.