Title:
ズームレンズ及びそれを有する撮像装置
Document Type and Number:
Japanese Patent JP5582918
Kind Code:
B2
Abstract:
A zoom lens includes in order from an object side to an image side and arranged along an optical axis thereof, a first lens unit having a negative refractive power, and a second lens unit having a positive refractive power. A distance between each lens unit changes when zooming from a wide-angle end to a telephoto end. The first lens unit includes a first lens sub-unit including a positive lens element and a negative lens element, and having a negative refractive power, and a second lens sub-unit including a single negative lens element. Focusing is performed by moving the second lens sub-unit in an optical axis direction, a focal length of the second lens sub-unit f1b and a focal length of the entire zoom lens fw at a wide-angle end are suitably set based on predetermined mathematical expressions.
Inventors:
Okumura 哲一朗
Application Number:
JP2010184920A
Publication Date:
September 03, 2014
Filing Date:
August 20, 2010
Export Citation:
Assignee:
Canon, Inc.
International Classes:
G02B15/20; G02B13/18; G03B17/14
Attorney, Agent or Firm:
Yukio Takanashi