JP2019101286A5

JP2019101286A5 -

Info

Publication number: JP2019101286A5
Application number: JP2017233337A
Authority: JP
Filing date: 2017-12-05
Publication date: 2021-01-21
Anticipated expiration: 2037-12-05

Description

本発明のズームレンズは、最も物体側に配置された正の屈折力のレンズ群ＬＰ１と、該レンズ群ＬＰ１の像側に配置された負の屈折力のレンズ群ＬＮ１と、該レンズ群ＬＮ１の像側に配置された開口絞りと、該開口絞りの像側に配置された負の屈折力のレンズ群ＬＮ２と、該レンズ群ＬＮ２の像側に隣接して順に配置された正の屈折力のレンズ群ＬＰ２及び負の屈折力のレンズ群ＬＮ３を有し、
広角端から望遠端へのズーミングに際して、前記レンズ群ＬＰ１は物体側へ移動し、前記レンズ群ＬＮ１は像側へ移動し、前記レンズ群ＬＰ２と前記レンズ群ＬＮ３の間隔は狭まり、隣り合うレンズ群の間隔が変化し、
無限遠から近距離へのフォーカシングに際して前記レンズ群ＬＮ２は像側へ移動し、
望遠端におけるレンズ全長をＴｄｔ、広角端におけるレンズ全長をＴｄｗ、広角端から望遠端へのズーミングにおける前記レンズ群ＬＮ１の移動量をΔＭ_ＬＮ１、望遠端における全系の焦点距離をｆｔとするとき、
０．４０＜ｆｔ／Ｔｄｔ＜１．２０
０．０３＜ΔＭ_ＬＮ１／Ｔｄｗ＞１．８０
なる条件式を満足することを特徴としている。 The zoom lens of the present invention, the most object placed positive refractive power lens groups side LP1, a lens group LN1 of negative refractive power disposed on the image side of the lens group LP1, of the lens group LN1 An aperture aperture arranged on the image side, a lens group LN2 having a negative refractive force arranged on the image side of the aperture aperture, and a positive refractive force arranged in order adjacent to the image side of the lens group LN2. It has a lens group LP2 and a lens group LN3 with a negative refractive force .
When zooming from the wide-angle end to the telephoto end, the lens group LP1 moves to the object side, the lens group LN1 moves to the image side, the distance between the lens group LP2 and the lens group LN3 narrows, and adjacent lens groups interval of changes,
Infinity front sharp lens group LN2 during focusing on a close range is moved to the image side,
Tdt the overall length of lens Nozomu far end, Tdw the total lens length at the wide-angle end, when the moving amount .DELTA.M _LN1 of the lens group LN1 in the zooming from the wide-angle end to the telephoto _end, the focal length of the entire system at the telephoto end and ft ,
0.40 <ft / Tdt <1.20
0.03 <ΔM _{LN1 /} Tdw> 1.80
It is characterized by satisfying the conditional expression.

Claims

The most object placed positive refractive power lens groups side LP1, a lens group LN1 of negative refractive power disposed on the image side of the lens group LP1, arranged on the image side of the lens group LN1 opening aperture and a lens group LN2 of negative refractive power disposed on the image side of the aperture stop, a positive lens group LP2 and negative refractive refractive power arranged in this order adjacent to the image side of the lens group LN2 It has a power lens group LN3 and
When zooming from the wide-angle end to the telephoto end, the lens group LP1 moves to the object side, the lens group LN1 moves to the image side, the distance between the lens group LP2 and the lens group LN3 narrows, and adjacent lens groups interval of changes,
Infinity front sharp lens group LN2 during focusing on a close range is moved to the image side,
Tdt the overall length of lens Nozomu far end, Tdw the total lens length at the wide-angle end, when the moving amount .DELTA.M _LN1 of the lens group LN1 in the zooming from the wide-angle end to the telephoto _end, the focal length of the entire system at the telephoto end and ft ,
0.40 <ft / Tdt <1.20
0.03 <ΔM _{LN1 /} Tdw> 1.80
A zoom lens characterized by satisfying the conditional expression.

When the focal length of the lens group LN1 is f _LN1 ,
0.15 <-f _{LN1 /} ft <0.50
The zoom lens according to claim 1, wherein the zoom lens satisfies the conditional expression.

The zoom lens according to claim 1 or 2 hands the lens group LP2 characterized in that it is a stationary during zooming.

When the amount of movement of the lens group LP1 in zooming from the wide-angle end to the telephoto end is ΔM _LP1 .
0.25 <-ΔM _{LP1 /} Tdw <0.60
The zoom lens according to any one of claims 1 to 3, wherein the zoom lens satisfies the conditional expression.

When the amount of movement of the lens group LN2 in zooming from the wide-angle end to the telephoto end is ΔM _LN2 ,
0.02 <-ΔM _{LN2 /} Tdw <0.10
The zoom lens according to any one of claims 1 to 4, wherein the zoom lens satisfies the conditional expression.

When the amount of movement of the lens group LN3 in zooming from the wide-angle end to the telephoto end is ΔM _LN3 ,
0.05 <−ΔM _{LN3 /} Tdw <0.30
The zoom lens according to any one of claims 1 to 5, wherein the zoom lens satisfies the conditional expression.

When the focal distance of the lens group LP2 is f _LP2 and the focal distance of the lens group LN3 is f _LN3 ,
0.40 <-f _LP2 / f _LN3 <1.50
The zoom lens according to any one of claims 1 to 6, wherein the zoom lens satisfies the conditional expression.

When the focal length of the lens group LP1 is f _LP1 , the focal length of the lens group LN2 is f _LN2 , the focal length of the lens group LP2 is f _LP2 , and the focal length of the lens group LN3 is f _LN3 .
0.60 <f _{LP1 /} ft <2.00
0.10 <-f _{LN2 /} ft <0.50
0.30 <f _{LP2 /} ft <1.00
0.40 <-f _{LN3 /} ft <1.50
The zoom lens according to any one of claims 1 to 7, wherein the zoom lens satisfies the conditional expression.

Disposed in this order toward the image side from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, an aperture stop, a third lens unit having a positive refractive power, the negative refractive power first It is composed of 4 lens groups, a 5th lens group with a positive refractive power, a 6th lens group with a negative refractive power, a 7th lens group with a positive refractive power, and an 8th lens group with a negative refractive power.
The first lens group is the lens group LP1, the second lens group is the lens group LN1, the sixth lens group is the lens group LN2, and the seventh lens group is the lens group LP2. The zoom lens according to any one of claims 1 to 8, wherein the eighth lens group is the lens group LN3.

Disposed in this order toward the image side from the object side, a first lens unit having a positive refractive power, a second lens unit having positive refractive power, a third lens unit having a negative refractive power, an aperture stop, a positive refractive power first 4 lens groups, 5th lens group with negative refractive power, 6th lens group with positive refractive power, 7th lens group with negative refractive power, 8th lens group with positive refractive power, 1st negative refractive power Consists of 9 lens groups
The first lens group is the lens group LP1, the third lens group is the lens group LN1, the seventh lens group is the lens group LN2, and the eighth lens group is the lens group LP2. The zoom lens according to any one of claims 1 to 8, wherein the ninth lens group is the lens group LN3.

An image pickup apparatus comprising the zoom lens according to any one of claims 1 to 10 and an image pickup element that receives an image formed by the zoom lens.