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.:

US 11372206 B1

Date of Patent:

Jun. 28, 2022

Filed:

Nov. 25, 2019

Optical system with two lens groups of +− refractive powers having five lens subgroups of +−+−− refractive powers, and image pickup apparatus including the same

Applicant:

Canon Kabushiki Kaisha, Tokyo, JP;

Inventor:

Takeo Mori, Utsunomiya, JP;

Assignee:

CANON KABUSHIKI KAISHA, Tokyo, JP;

Attorney:

Canon U.S.A., Inc. IP Division

Primary Examiner:

Wen Huang

Int. Cl.

CPC ...

G02B 9/64 (2006.01); G02B 13/02 (2006.01); G02B 15/14 (2006.01);

U.S. Cl.

CPC ...

G02B 9/64 (2013.01); G02B 13/02 (2013.01); G02B 15/145105 (2019.08);

Abstract

An optical system includes a front lens group and a rear lens group that are disposed in order from an object side to an image side of the optical system, the front lens group having a positive refractive power and the rear lens group having a negative refractive power. The rear lens group consists of a lens unit Lnthat is arranged to move towards the image side when focusing and that has a negative refractive power, and a lens unit Lnthat is disposed closer to the image side than the lens unit Lnand that has a negative refractive power. The front lens group includes a lens unit Lpf arranged to move during focusing. The rear lens group satisfies a predetermined conditional expression.

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