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:
Jul. 05, 2022
Filed:
Jun. 04, 2019
Nittoh Inc., Suwa, JP;
Tetsuya Abe, Sapporo, JP;
NITTOH INC., Suwa, JP;
Abstract
A zoom lens system () for imaging, includes, in order from an object side (); a first lens group (G) with negative refractive power that moves at the time of zooming; a second lens group (G) with a positive refractive power that moves at the time of zooming, the second lens group including an aperture stop (St); a third lens group (G) with a positive refractive power, the position of which is fixed relative to the image plane. The second lens group includes: a first sub-lens group (S) with a positive refractive power arranged on the object side and having the aperture stop; and a second sub-lens group (S) with a negative refractive power arranged on the image plane side and configured to move independently of the first sub-lens group at the time of focusing.