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. 03, 2021
Filed:
Aug. 22, 2019
Fujifilm Corporation, Tokyo, JP;
Kenji Ito, Saitama, JP;
Toshio Sasaki, Saitama, JP;
Masayasu Konishi, Saitama, JP;
Michio Cho, Saitama, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
There are provided a lens, a zoom lens, and an imaging lens capable of eliminating blurriness of a ring zone without reducing resolution and increasing the number of steps of processing. A lenshas random unevenness within an optical effective diameter D of an optical surface, an arithmetic mean roughness Ra within the optical effective diameter D of the optical surfaceis 20 nm or more and 50 nm or less, and an average value of widths W of protrusion portionsof the unevenness on an average line Cof a roughness curve Cof the optical surfaceis 1/200 or more and 1/50 or less of the optical effective diameter D of the optical surface. The lensis suitably used as a lens that composes a zoom lens or an imaging lens.