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. 05, 2019
Filed:
Feb. 09, 2017
Fujifilm Corporation, Tokyo, JP;
Tetsuya Ori, Saitama, JP;
Michio Cho, Saitama, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
Provided are a rear converter lens and an imaging apparatus capable of achieving favorable optical performance and an appropriate back focal length with high magnification. The rear converter lens RCL consists of, in order from the object side, four lens-groups of positive, negative, negative, and positive lens-groups. In order from the object side, a first lens-group RGconsists of a negative lens RLand a positive lens RL, a second lens-group RGconsists of a negative lens RLand a positive lens RL, a third lens-group RGconsists of a negative lens RL, a positive lens RL, and a negative lens RL, and a fourth lens-group RGconsists of a biconvex lens RLand a negative lens RL. Here, 0.22<cf/f12<1 is satisfied, where f12 is a composite focal length of the first lens-group RGand the second lens-group RG, and cf is a focal length of the rear converter lens RCL.