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:
Jun. 29, 2004
Filed:
Jun. 19, 2001
Applicant:
Inventors:
Assignee:
Nikon Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 2/754 ; G03B 2/742 ; G03B 2/126 ; A61N 5/00 ; G02B 2/608 ;
U.S. Cl.
CPC ...
G03B 2/754 ; G03B 2/742 ; G03B 2/126 ; A61N 5/00 ; G02B 2/608 ;
Abstract
A projection optical system forms an image of an object in a first plane onto a second plane. The projection optical system has an optical element group including at least one refractive member and plural reflective members, and a plurality of lens-barrel units holding the optical element group divided into a plurality of respective groupings. The reflective members are all held by a single lens-barrel unit of the plurality of lens-barrels units.