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:
Nov. 06, 2018
Filed:
Aug. 19, 2016
Nikon Vision Co., Ltd, Shinagawa-ku, Tokyo, JP;
Yosuke Miyazaki, Ichihara, JP;
NIKON VISION CO., LTD., Tokyo, JP;
Abstract
A variable-power optical system includes, in order from an object, an objective optical system (O), a relay optical system (R), and an eyepiece optical system (E), wherein the relay optical system is provided with, in order from the object, a first lens group (G) having positive refractive power, a second lens group (G) having positive refractive power, and a third lens group (G) having positive refractive power, and is an optical system in which an image formed by the objective optical system with variable optical power, and the variable-power optical system is configured so as to satisfy expressions: 0.7<|β|<1.4, and 12 (mm)<f<15 (mm), where |β|denotes a minimum of absolute value of imaging magnification of the relay optical system, and fdenotes a shortest focal length.