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:
Nov. 24, 2020
Filed:
Sep. 24, 2018
Applicant:
Kazuyasu Ohashi, Chiba, JP;
Inventor:
Kazuyasu Ohashi, Chiba, JP;
Assignee:
Ricoh Company, Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B 9/62 (2006.01); G02B 9/58 (2006.01); G02B 27/00 (2006.01); G02B 13/04 (2006.01); G02B 13/00 (2006.01);
U.S. Cl.
CPC ...
G02B 9/62 (2013.01); G02B 9/58 (2013.01); G02B 13/0045 (2013.01); G02B 13/04 (2013.01); G02B 27/0037 (2013.01);
Abstract
An imaging optical system including a first lens having negative refractive power; a second lens having negative refractive power; a third lens having positive refractive power; an aperture stop; a fourth lens having positive refractive power; a fifth lens having negative refractive power; and a six lens arranged in that order from an object side. The first lens is a negative lens with a concave surface facing the image side. The second lens is a negative lens with a concave surface facing the object side. The second lens and the third lens are joined together to form a cemented lens have positive refractive power.