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:
May. 12, 2020
Filed:
Sep. 29, 2016
Applicant:
Canon Kabushiki Kaisha, Tokyo, JP;
Inventor:
Yosuke Eguchi, Saitama, JP;
Assignee:
CANON KABUSHIKI KAISHA, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 9/00 (2006.01); G02B 13/04 (2006.01); G02B 13/00 (2006.01); G02B 27/00 (2006.01);
U.S. Cl.
CPC ...
G02B 13/04 (2013.01); G02B 13/0045 (2013.01); G02B 27/0025 (2013.01);
Abstract
At least one embodiment of an optical system includes, in order from an object side to an image side, a front unit having a plurality of lenses, an aperture stop, and a rear unit having a positive refractive power. In at least one embodiment, a positive lens and three or more negative lenses are disposed in the front unit, and the material of negative lenses included in the front unit, the focal length of the front unit, and the focal length of the entire optical system are set appropriately.