Title:
ズームレンズ及びそれを有する画像投射装置
Document Type and Number:
Japanese Patent JP5709640
Kind Code:
B2
Abstract:
Provided is a zoom lens, including in order from a magnification conjugate side to a reduction conjugate side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a negative refractive power; a fifth lens unit having a negative refractive power; and a sixth lens unit having a positive refractive power. The first and sixth lens units do not move for zooming, while the second to fifth lens units move to the magnification conjugate side during zooming from a wide-angle end to a telephoto end. Each of the second and third lens units is composed of a single positive lens. Movement amounts of the second, third and fourth lens units during zooming from the wide-angle end to the telephoto end satisfy appropriate relationships.
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Inventors:
Junya Ichimura
Application Number:
JP2011105632A
Publication Date:
April 30, 2015
Filing Date:
May 10, 2011
Export Citation:
Assignee:
Canon Inc
International Classes:
G02B15/20
Domestic Patent References:
| JP200584352A |
Attorney, Agent or Firm:
Takuma Abe
Sogo Kuroiwa
Sogo Kuroiwa