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:
Mar. 02, 2021
Filed:
Dec. 17, 2018
Applicant:
Tamron Co., Ltd., Saitama, JP;
Inventors:
Yoshito Iwasawa, Saitama, JP;
Hisayuki Yamanaka, Saitama, JP;
Keisuke Okada, Saitama, JP;
Junichi Yamazoe, Saitama, JP;
Assignee:
Tamron Co., Ltd., Saitama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/17 (2006.01); G02B 15/177 (2006.01); G02B 13/18 (2006.01); G02B 27/64 (2006.01);
U.S. Cl.
CPC ...
G02B 15/177 (2013.01); G02B 13/18 (2013.01); G02B 27/646 (2013.01);
Abstract
A zoom lens including a front group and a rear group, wherein a lens group arranged on an object side of a widest air interval at a wide-angle end is defined as the front group and a lens group arranged on an image side of the widest air interval at the wide-angle end is defined as the rear group, the front group having a negative refractive power, the rear group having a positive refractive power. Changing focal length from the wide-angle end to the telephoto end is performed by changing an air interval between the lens groups.