JP2017097263A5

JP2017097263A5 -

Info

Publication number: JP2017097263A5
Application number: JP2015231502A
Authority: JP
Filing date: 2015-11-27
Publication date: 2019-01-10
Anticipated expiration: 2035-11-27

Description

本発明は、隣り合うレンズの光軸上の間隔のうち最も大きい間隔を境に、物体側に配置された負の屈折力の第１レンズ群と、像側に配置された正の屈折力の第２レンズ群から成る光学系において、前記第１レンズ群と前記第２レンズ群の間隔をＬ、前記第１レンズ群の焦点距離をｆ１、前記光学系の焦点距離をｆとするとき、
−０．６０＜ｆ１／Ｌ＜−０．１０
３．２０＜Ｌ／ｆ＜５．５０
なる条件式を満足することを特徴としている。 The present invention includes a first lens unit having a negative refractive power arranged on the object side and a positive refractive power arranged on the image side, with the largest interval among the intervals on the optical axis of adjacent lenses. in an optical system consisting of the second lens group, a distance between the second lens group and the third lens group L, and the focal length of the first lens group f1, the focal length of the optical system when is f,
−0.60 <f1 / L <−0.10
3.20 <L / f <5.50
It satisfies the following conditional expression.

本発明の光学系Ｌ０は、隣り合うレンズの光軸上の間隔のうち最も大きい間隔を境に、
物体側に配置された負の屈折力の第１レンズ群と、像側に配置された正の屈折力の第２レ
ンズ群から成る。第１レンズ群と第２レンズ群のレンズ間隔をＬ、第１レンズ群Ｌ１の焦
点距離をｆ１、光学系の焦点距離をｆとする。このとき、
−０．６０＜ｆ１／Ｌ＜−０．１０・・・（１）
３．２０＜Ｌ／ｆ＜５．５０・・・（２）
なる条件式を満足する。 The optical system L0 of the present invention has the largest interval among the intervals on the optical axis of adjacent lenses,
The first lens group having negative refractive power disposed on the object side and the second lens group having positive refractive power disposed on the image side . The lens interval between the first lens unit and the second lens unit is L, the focal length of the first lens unit L1 is f1, and the focal length of the optical system is f. At this time,
−0.60 <f1 / L <−0.10 (1)
3.20 <L / f <5.50 (2)
The following conditional expression is satisfied.

各実施例において第２レンズ群Ｌ２は、物体側から像側に順に配置されたフォーカシングに際して不動の正の屈折力の前方群（前群）、フォーカシングに際して移動するフォーカス群、フォーカシングに際して不動の後方群（後群）より構成される。 In each embodiment, the second lens unit L2 is arranged in order from the object side to the image side, and has a positive refractive power front group (front group) that does not move during focusing, a focus group that moves during focusing, and a rear group that does not move during focusing. It consists of (back group).

Claims

A first lens group having a negative refractive power arranged on the object side and a second lens group having a positive refractive power arranged on the image side with the largest interval among the intervals on the optical axis of adjacent lenses as a boundary. In an optical system consisting of
When the distance between the first lens group and the second lens group is L, the focal length of the first lens group is f1, and the focal length of the optical system is f,
−0.60 <f1 / L <−0.10
3.20 <L / f <5.50
An optical system that satisfies the following conditional expression:

When the distance on the optical axis from the front principal point position of the first lens group to the object-side lens surface of the most object-side lens of the second lens group is X,
3.50 <X / f <5.50
The optical system according to claim 1, wherein the following conditional expression is satisfied.

The distance on the optical axis from the lens surface closest to the object side of the optical system to the entrance pupil position of the optical system is T, and the optical axis from the effective diameter position of the light beam on the lens surface closest to the image side of the first lens group. when the perpendicular to the optical axis point to point intersects P drawn down to, when the DL1 a distance on the optical axis from the point P to the lens surface on the most object side of the first lens group,
0.50 <T / DL1 <2.50
The optical system according to claim 1, wherein the following conditional expression is satisfied.

The second lens group includes, in order from the object side to the image side, a positive refractive power front group that does not move during focusing, a focus group that moves during focusing, and a rear group that does not move during focusing. The optical system according to any one of claims 1 to 3 .

The optical system according to claim 1, wherein the first lens group includes one negative lens.

The optical system according to any one of claims 1 to 4, wherein the first lens group includes two negative lenses.

An imaging apparatus comprising: the optical system according to claim 1; and an imaging element that receives an image formed by the optical system.

When the half length of the diagonal of the image sensor is IH,
−1.40 <f1 / IH <−0.40
The image pickup apparatus according to claim 7, wherein the following conditional expression is satisfied.

When the length of half of the diagonal length of the image sensor is IH, and the focal length of the second lens group is f2,
1.2 <f2 / IH <2.6
The imaging apparatus according to claim 7, wherein the following conditional expression is satisfied.

A plurality of the optical systems according to claim 1, wherein the plurality of optical systems is a point on the optical axis between the first lens group and the second lens group of each optical system. The image pickup apparatus according to claim 7, wherein the optical axes of the optical systems are arranged so as to intersect each other.