US 10,241,306 B2 · Telephoto lens and image pickup apparatus using the same

Abstract

A telephoto lens includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit, and the first lens unit includes a front-side lens unit having a positive refractive power and a rear-side lens unit, and the second lens unit moves at the time of focusing, and the third lens unit has a positive lens and a negative lens, and the front-side lens unit includes lenses positioned closer to the object side than a predetermined negative lens that satisfies Conditional Expression (a), and the rear-side lens unit has the predetermined negative lens and a positive lens, and Conditional Expressions (1A) and (14) are satisfied: 0.5≤|f/fLn| (a), 0.015≤DGFGR/f≤0.25 (1A), and 0.19≤DGFairmax/DGF≤1.0 (14).

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Drawings

Claims41

Dependent claims

A telephoto lens comprising lens units consisting of, in order from an object side:

a first lens unit having a positive refractive power;
a second lens unit having a negative refractive power;
and
a third lens unit,
wherein:
the first lens unit consists of, in order from the object side, a front-side lens unit having a positive refractive power and a rear-side lens unit,
at a time of focusing, the second lens unit moves,
the third lens unit has a positive lens and a negative lens,
the first lens unit has one or a plurality of negative lens elements which satisfies following Conditional Expression (a),
the rear-side lens unit comprises a predetermined negative lens element that is closest to the object side from among lens elements in the rear-side lens unit, and that is closest to the object side from among the one or plurality of negative lens elements of the first lens unit,
lens elements of the front-side lens unit which are positioned closer to the object side than the predetermined negative lens element include a plurality of positive lens elements,
the rear-side lens unit has the predetermined negative lens element and a positive lens element, and
following Conditional Expressions (1A) and (14) are satisfied:
0.5≤|f/fLn|≤4.908 (a),
0.015≤DGFGR/f≤0.25 (1A),
and
0.19≤DGFairmax/DGF≤1.0 (14),
where,
f is a focal length of the telephoto lens at a time of focusing on an infinite object;
fLn is a focal length of the predetermined negative lens element;
DGFGR is an axial air space between the front-side lens unit and the rear-side lens unit;
DGFairmax is a largest axial air space, of axial air spaces in the front-side lens unit;
and
DGF is an axial thickness of the front-side lens unit.

21 more elements

A telephoto lens comprising lens units consisting of, in order from an object side:

a first lens unit having a positive refractive power;
a second lens unit having a negative refractive power;
and
a third lens unit,
wherein:
the first lens unit consists of, in order from the object side, a front-side lens unit having a positive refractive power, a first rear-side lens unit, and a second rear-side lens unit,
at a time of focusing, the second lens unit moves,
the third lens unit has a positive lens element and a negative lens element,
the first lens unit has one or a plurality of negative lens elements which satisfies following Conditional Expression (a),
the first rear-side lens unit comprises a predetermined negative lens element that is closest to the object side from among lens elements in the first rear-side lens unit, and that is closest to the object side from among the one or plurality of negative lens elements of the first lens unit,
lens elements of the front-side lens unit which are positioned closer to the object side than the predetermined negative lens element include a plurality of positive lens elements,
the first rear-side lens unit has the predetermined negative lens element and a positive lens element,
the second rear-side lens unit has a positive lens element, and
following Conditional Expressions (2B) and (16) are satisfied:
0.5.≤|f/fLn|4.908 (a),
0.10≤ΔGFGR1/f≤0.5 (2B),
and
50≤vdLp1≤70.23 (16),
where,
f is a focal length of the telephoto lens at a time of focusing on an infinite object;
fLn is a focal length of the predetermined negative lens element;
ΔGFGR1 is an axial air space from an object-side surface in the front-side lens unit to an object-side surface in the first rear-side lens unit;
and
vdLp1 is an Abbe number of a positive lens positioned closest to the object side.

21 more elements

Dependencies are inferred from the claim text.

Description21,936 words

Summary935 words

#The present application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2016-004631 filed on Jan. 13, 2016; the entire contents of which are incorporated herein by reference.

#Field of the Invention

#The present invention relates to a telephoto lens and an image pickup apparatus using the same.

Brief description of the drawings22 figures

#FIG. 1A and FIG. 1B are lens cross-sectional views of a telephoto lens of Example 1;

#FIG. 2A and FIG. 2B are lens cross-sectional views of a telephoto lens of Example 2;

#FIG. 3A and FIG. 3B are lens cross-sectional views of a telephoto lens of Example 3;

Detailed description20,557 words

#Prior to a description of examples, the operation effects of embodiments according to an aspect of the present invention will be described. When the operation effects of the present embodiment are described, specific examples will be illustrated. However, as is the case with the examples described later, the illustrated aspects are only a few of the aspects included in the present invention, and the aspects include a number of variations. Therefore, the present invention is not limited to the illustrated aspects.

#A telephoto lens of a first embodiment includes, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit, and the first lens unit includes, in order from the object side, a front-side lens unit having a positive refractive power and a rear-side lens unit, and at a time of focusing, the second lens unit moves, and the third lens unit has a positive lens and a negative lens, and the front-side lens unit includes lenses positioned closer to the object side than a predetermined negative lens that satisfies following Conditional Expression (a), and the lenses positioned closer to the object side than the predetermined negative lens include a plurality of positive lenses, and the rear-side lens unit has the predetermined negative lens and a positive lens, and following Conditional Expressions (1A) and (14) are satisfied: 0.5≤|f/fLn| (a), 0.015≤DGFGR/f≤0.25 (1A), and 0.19≤DGFairmax/DGF≤1.0 (14),

#where,

Facts

Application

15/372,328Filed 7 Dec 2016

Priority

JP 2016-00463113 Jan 2016

Published

US 2017/0199358 A113 Jul 2017

Granted

26 Mar 2019

Term ends

7 Dec 2036

Estimated · how

20 years from earliest known nonprovisional domestic filing plus recorded patent term adjustment. Maintenance-fee lapses, terminal disclaimers and statutory extensions have not been checked. The continuity chain may be incomplete; this is not an enforceability determination.

Classification7 codes

G02B 13/02
Optical objectives specially designed for the purposes specified below: telephoto objectives, i.e. systems of the type + - in which the distance…
G02B 27/646
Imaging systems using optical elements for stabilisation of the lateral and angular position of the image: compensating for small deviations, e.g.…
G03B 5/00
Adjustment of optical system relative to image or object surface other than
G03B 13/32
Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras: means for focusing

Timeline

13 Jan 2016Priority claimedJP 2016-004631
7 Dec 2016Application filedUS 15/372,328
7 Dec 2016Assigned to Olympus Corporationassignment of assignor's interest
13 Jul 2017PublishedUS 2017/0199358 A1
26 Mar 2019GrantedUS 10,241,306 B2
19 Nov 2021Assigned to Om Digital Solutions Corporationassignment of assignor's interest
12 Oct 2026TodayWithin its term
7 Dec 2036Term endsEstimated

Telephoto lens and image pickup apparatus using the same

Life of this patent

Telephoto lens and image pickup apparatus using the same

Life of this patent

Life of this patent

Abstract

Drawings

Drawings

Claims41

Description21,936 words

Drawings

Classification7 codes

Life of this patent

Description21,936 words