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:
Feb. 07, 2006
Filed:
May. 21, 2004
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 for projecting an image of a first object onto a second object includes a first imaging optical system that forms a first intermediate image of the first object, and includes a lens, a second imaging optical system that forms a second intermediate image of the first object, and includes a lens and a concave mirror, and a third imaging optical system that forms an image of the first object onto the second object, and includes a lens, wherein the first, second and third imaging optical systems are arranged along an optical path from the first object in this order, and 0.7<|β|<3.0 is met where βis a paraxial magnification of the first imaging optical system, and βis a paraxial magnification of the second imaging optical system.