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:
Apr. 16, 2024
Filed:
Nov. 12, 2020
Applicant:
Ricoh Company, Ltd., Tokyo, JP;
Inventor:
Akinori Suzuki, Kanagawa, JP;
Assignee:
RICOH COMPANY, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 13/00 (2006.01); G02B 9/64 (2006.01); G02B 13/06 (2006.01);
U.S. Cl.
CPC ...
G02B 13/0045 (2013.01); G02B 9/64 (2013.01); G02B 13/006 (2013.01); G02B 13/06 (2013.01);
Abstract
An imaging lens includes a first group, a second group, an aperture stop, a third group, and a fourth group. The second group includes one positive lens. The third group includes two positive lenses and one negative lens. At least two of the third group are joined together to form a compound lens. The imaging lens has a fixed focal length and an angle of view of 120 degrees or more. Conditional expressions (1), (2), (3), and (4) below are satisfied:−2.7≤1/≤−0.7 (1)2.2≤2/≤6.6 (2)3.9≤3/≤14.3 (3)2.8≤4/≤11.0 (4)