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:
Aug. 07, 2018
Filed:
Sep. 06, 2017
Fujifilm Corporation, Tokyo, JP;
Hitoshi Shimizu, Saitama, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A projection lens has lens holding frames that hold lenses. In a case where an image forming panel is disposed to be shifted with respect to an optical axis of the projection lens, an increase in temperature of a first part on a side to which the image forming panel is shifted with respect to the optical axis L, is greater than that of a second part on the opposite side. A hollow structure, which makes the first partand the second partcommunicate with each other, has a porous layer and is filled with a heat storage medium. By circulating the heat storage medium through the inside of the hollow structure, the first part is cooled, and the second part is heated. Therefore, temperature distribution in the circumferential direction of the lens barrel becomes uniform, and deterioration in performance of the projected image is suppressed.