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1. (US20110273774) Zoom lens and image pickup apparatus including the zoom lens

Office : United States of America
Application Number: 13142636 Application Date: 06.01.2010
Publication Number: 20110273774 Publication Date: 10.11.2011
Grant Number: 09019610 Grant Date: 28.04.2015
Publication Kind : B2
Prior PCT appl.: Application Number:PCTJP2010000052 ; Publication Number: Click to see the data
IPC:
G02B 27/64
G02B 15/14
G02B 15/173
G02B 9/34
G02B 13/12
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27
Other optical systems; Other optical apparatus
64
Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15
Optical objectives with means for varying the magnification
14
by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
15
Optical objectives with means for varying the magnification
14
by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
16
with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
163
having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
167
having an additional fixed front lens or group of lenses
173
arranged + +
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
9
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or
34
having four components only
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
13
Optical objectives specially designed for the purposes specified below
08
Anamorphotic objectives
12
with variable magnification
Applicants: Hiroshi Saruwatari
Canon Kabushiki Kaisha
Inventors: Hiroshi Saruwatari
Agents: Canon USA Inc. IP Division
Priority Data: 2009-001446 07.01.2009 JP
Title: (EN) Zoom lens and image pickup apparatus including the zoom lens
Abstract: front page image
(EN)

A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power. In the zoom lens, each lens unit moves to perform zooming. In addition, an amount of movement Mm of the fourth lens unit when zooming from a wide angle end to an intermediate zooming position, an amount of movement Mt of the fourth lens unit when zooming from the wide angle end to a telephoto end, a focal length fw of an entire system at the wide angle end, and focal lengths f3 and f4 of the respective third lens unit and fourth lens unit are properly set.


Also published as:
WO/2010/079750