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:
Sep. 03, 2019
Filed:
Nov. 16, 2016
Konica Minolta, Inc., Chiyoda-ku, JP;
Atsuo Masui, Sakai, JP;
KONICA MINOLTA, INC., Tokyo, JP;
Abstract
A projection optical system capable of performing magnification projection of an image displayed on an image display surface, with a 40° half angle of view, or more includes, in an order from a magnification side: a first optical system; and a second optical system, wherein the second optical system forms an intermediate image of the image, the first optical system performs magnification projection of the intermediate image, and the following conditional expressions (1) and (2) are satisfied: 1<Ff/|Fw|<2 . . . (1), 0.4<Lf/Lw<0.6 . . . (2), where, Ff: a focal length of the first optical system, Fw: a focal length of an entire system, Lf: a distance on optical axis, from a most-magnification-side surface vertex to the intermediate image, in the first optical system, Lw: an entire length of a lens.