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:
May. 30, 2006
Filed:
Nov. 03, 2005
Takashi Kato, Tochigi, JP;
Chiaki Terasawa, Tochigi, JP;
Takashi Kato, Tochigi, JP;
Chiaki Terasawa, Tochigi, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A projection optical system projects an image of a first object onto a second object. A first imaging optical system forms a first intermediate image of the first object, and is a refractive optical system. A second imaging optical system forms a second intermediate image of the first object, and includes two mirrors, one of the two being concave. A third imaging optical system forms an image of the first object onto the second object, and includes a lens. The first, second and third imaging optical systems are arranged along an optical path from the first object in this order. The system satisfies the expression 0.80<|β<2.0 where βand βare paraxial magnifications of the first and second imaging optical systems, respectively. The first imaging optical system and the concave mirror have a common straight optical axis.