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. 12, 2017
Filed:
Apr. 19, 2016
Hibiki Tatsuno, Kawasaki, JP;
Kiichiro Nishina, Yokohama, JP;
Yasuyuki Shibayama, Ebina, JP;
Takanobu Osaka, Yokohama, JP;
Makoto Hirakawa, Hiratsuka, JP;
Hibiki Tatsuno, Kawasaki, JP;
Kiichiro Nishina, Yokohama, JP;
Yasuyuki Shibayama, Ebina, JP;
Takanobu Osaka, Yokohama, JP;
Makoto Hirakawa, Hiratsuka, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A magnification optical system forms an enlarged image of an object. It includes a refractive optical system including a plurality of lens groups; and a mirror train including a curved mirror, arranged in this order from an object side, a first focus structure configured to move the respective lens groups of the refractive optical system by different amounts along a normal line of a conjugate surface on the object side, and a second focus structure configured to move the respective lens groups along the normal line of the conjugate surface on the object side by different amounts from those of the first focus structure.