JP2014137483A5

JP2014137483A5 -

Info

Publication number: JP2014137483A5
Application number: JP2013006178A
Authority: JP
Filing date: 2013-01-17
Publication date: 2016-03-03

Description

本発明の撮像装置は、物体側から像側へ順に、負の屈折力の第１レンズ群、正の屈折力の第２レンズ群を有し、広角端から望遠端へのズーミングに際して前記第１レンズ群と前記第２レンズ群が光軸上を移動し、隣り合うレンズ群の間隔が変化するズームレンズと、該ズームレンズによって結像される像を受光する撮像素子を有する撮像装置において、
広角端と望遠端における撮像範囲は異なっており、無限遠に位置する物体から出射し、撮影半画角θで入射した光束の広角端と望遠端における結像像高を各々Ｙｗ∞、Ｙｔ∞、至近距離に位置する物体から出射し、撮影半画角θで入射した光束の広角端と望遠端における結像像高を各々Ｙｗ至近、Ｙｔ至近、無限遠物体にフォーカスしているときの広角端と望遠端における全系の焦点距離を各々ｆｗ∞、ｆｔ∞とするとき、焦点距離ｆｉが
ｆｗ∞＜ｆｉ＜ｆｔ∞
を満足するズーム位置において、
撮影半画角θで入射した光束の焦点距離ｆｉにおける結像像高をＹｉとするとき、
１．８０≦Ｙｔ∞／Ｙｗ∞≦２．５
１．６０≦Ｙｔ至近／Ｙｗ至近＜１．８０
ただし、Ｙｉ＝２×ｆｉ×ｓｉｎ（θ／２）（８５°≦θ≦９０°）
なる条件式を満足し、前記第１レンズ群の内部に開口径が可変又は固定の遮光部材を有することを特徴としている。 The imaging apparatus according to the present invention includes a first lens unit having a negative refractive power and a second lens group having a positive refractive power in order from the object side to the image side, and the first lens unit during zooming from the wide angle end to the telephoto end. In an imaging apparatus having a zoom lens in which a lens group and the second lens group move on an optical axis and an interval between adjacent lens groups is changed , and an image sensor that receives an image formed by the zoom lens,
The imaging range at the wide-angle end and the telephoto end are different, and the formed image heights at the wide-angle end and the telephoto end of a light beam emitted from an object located at infinity and incident at a shooting half angle of view θ are respectively Yw∞ and Yt∞. The wide angle when the image height at the wide-angle end and the telephoto end of the light beam emitted from an object located at a close distance and incident at a shooting half angle of view θ is focused on an object at Yw, Yt, and infinity, respectively. When the focal lengths of the entire system at the end and the telephoto end are fw∞ and ft∞, respectively, the focal length fi is fw∞ <fi <ft∞.
In the zoom position that satisfies
When the image height at the focal length fi of the light beam incident at the shooting half angle of view θ is Yi,
1.80 ≦ Yt∞ / Yw∞ ≦ 2.5
1.60 ≦ Yt close / Yw close <1.80
However, Yi = 2 × fi × sin (θ / 2) (85 ° ≦ θ ≦ 90 °)
The following conditional expression is satisfied, and the first lens group includes a light shielding member having a variable or fixed aperture diameter.

この他、本発明のズームレンズは、物体側から像側へ順に、負の屈折力の第１レンズ群、正の屈折力の第２レンズ群を有し、広角端から望遠端へのズーミングに際して第１レンズ群と第２レンズ群が光軸上を移動し、隣り合うレンズ群の間隔が変化するズームレンズにおいて、第１レンズ群は広角端において最大軸外光線の一部を遮光し、望遠端において最大軸外光線を遮光しない開口径が可変又は固定の遮光部材を有することを特徴としている。 In addition, the zoom lens of the present invention has a first lens group having a negative refractive power and a second lens group having a positive refractive power in order from the object side to the image side, and during zooming from the wide-angle end to the telephoto end. In a zoom lens in which the first lens group and the second lens group move on the optical axis, and the interval between adjacent lens groups changes , the first lens group shields part of the maximum off-axis light beam at the wide angle end, and telephoto A light-shielding member having a variable or fixed aperture diameter that does not shield the maximum off-axis light beam at the end is characterized.

以下に、本発明の好ましい実施の形態を、添付の図面に基づいて詳細に説明する。本発明の撮像装置は、物体側から像側へ順に、負の屈折力の第１レンズ群、正の屈折力の第２レンズ群を有し、広角端から望遠端へのズーミングに際して第１レンズ群と第２レンズ群が光軸上を移動し、隣り合うレンズ群の間隔が変化するズームレンズを有する。更にズームレンズによって結像される像を受光する撮像素子を有する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The imaging apparatus of the present invention includes a first lens group having a negative refractive power and a second lens group having a positive refractive power in order from the object side to the image side, and the first lens is used for zooming from the wide angle end to the telephoto end. There is a zoom lens in which the group and the second lens group move on the optical axis, and the interval between the adjacent lens groups changes . In addition, an image sensor that receives an image formed by the zoom lens is provided.

本発明の撮像装置は、物体側から像側へ順に、負の屈折力の第１レンズ群Ｌ１、正の屈折力の第２レンズ群Ｌ２を有し、広角端から望遠端へのズーミングに際して第１レンズ群Ｌ１と第２レンズ群Ｌ２が光軸上を移動し、隣り合うレンズ群の間隔が変化するズームレンズを有する。ズームレンズによって結像される像を受光する撮像素子を有する。広角端と望遠端における撮像範囲は異なっている。無限遠物体において撮影半画角θで入射した光束の広角端と望遠端における結像像高を各々Ｙｗ∞、Ｙｔ∞とする。至近距離に位置する物体から出射し、撮影半画角θで入射した光束の広角端と望遠端における結像像高を各々Ｙｗ至近、Ｙｔ至近とする。 The imaging apparatus according to the present invention includes a first lens unit L1 having a negative refractive power and a second lens unit L2 having a positive refractive power in order from the object side to the image side, and performs first zooming from the wide angle end to the telephoto end. The first lens unit L1 and the second lens unit L2 have a zoom lens that moves on the optical axis and changes the interval between adjacent lens units . An image sensor that receives an image formed by the zoom lens is included. The imaging range at the wide-angle end and the telephoto end are different. Let Yw∞ and Yt∞ be the image heights at the wide-angle end and the telephoto end of the light beam incident at an infinitely far object at the shooting half angle of view θ. The image heights at the wide-angle end and the telephoto end of a light beam emitted from an object located at a close distance and incident at an imaging half angle of view θ are respectively close to Yw and Yt.

無限遠物体にフォーカスしているときの広角端と望遠端における全系の焦点距離を各々ｆｗ∞、ｆｔ∞とする。このとき、焦点距離ｆｉが
ｆｗ∞＜ｆｉ＜ｆｔ∞
を満足するズーム位置において、撮影半画角θで入射した光線の焦点距離ｆｉにおける結像像高をＹｉとする。このとき、
１．８０≦Ｙｔ∞／Ｙｗ∞≦２．５・・・（１）
１．６０≦Ｙｔ至近／Ｙｗ至近＜１．８０・・・（２）
ただし、Ｙｉ＝２×ｆｉ×ｓｉｎ（θ／２）（８５°≦θ≦９０°）
なる条件式を満足する。 The focal lengths of the entire system at the wide-angle end and the telephoto end when focusing on an object at infinity are fw∞ and ft∞, respectively. At this time, the focal length fi is fw∞ <fi <ft∞.
In a zoom position that satisfies the above, let Yi be an image height at the focal length fi of a light beam incident at a shooting half angle of view θ. At this time,
1.80 ≦ Yt∞ / Yw∞ ≦ 2.5 (1)
1.60 ≦ Yt close / Yw close <1.80 (2)
However, Yi = 2 × fi × sin (θ / 2) (85 ° ≦ θ ≦ 90 °)
The following conditional expression is satisfied.

そして、第１レンズ群Ｌ１の内部にズーミング又はフォーカシングに際して開口径が可変又は固定の遮光部材を有する。また、本発明の撮像装置において無限遠物体にフォーカスしているときにおける結像像高Ｙに結像する光束の撮影半画角をθ∞、至近距離物体にフォーカスしているときにおける結像像高Ｙに結像する光束の撮影半画角をθｍｏｄとする。このとき、
０．６７＜θ∞／θｍｏｄ≦１・・・（３）
なる条件式を満足する。また遮光部材は第１レンズ群の中で最も物体側に位置するレンズの像側に配置されている。 The first lens unit L1 includes a light shielding member whose aperture diameter is variable or fixed during zooming or focusing. Further, the photographing half angle of the light beam focused on the imaging image height Y in when focusing on an object at infinity in the imaging device of the present invention Shita∞, Yuizozo in when focusing on a close object Let θ mod be the shooting half angle of view of the light beam focused at high Y. At this time,
0.67 <θ∞ / θmod ≦ 1 (3)
The following conditional expression is satisfied. The light shielding member is disposed on the image side of the lens located closest to the object side in the first lens group .

この他、本発明の撮像装置では広角端において最大画角光束（最軸外光束）（最大画角光線）を遮光せず、望遠端において最大画角光束を遮光する第２遮光部材が最も物体側に位置するレンズの外周側に配置されている。 In addition, in the image pickup apparatus of the present invention, the second light-shielding member that shields the maximum field-angle light beam at the telephoto end without shielding the maximum field-angle light beam (the most off-axis light beam) (maximum field-angle light beam) at the wide-angle end is the most object. It is arrange | positioned at the outer peripheral side of the lens located in the side.

１．８０≦Ｙｔ∞／Ｙｗ∞≦２．２・・・（１ａ）
ただし、Ｙ＝２×ｆ×ｓｉｎ（θ／２）（８５°≦θ≦９０°）
一般的な画面サイズは、縦横比が２：３であるものが多い。この比率の画面サイズにおいて円周魚眼から対角線魚眼までを包括するには少なくとも条件式（１）の数値は１．８以上とするのが良い。 1.80 ≦ Yt∞ / Yw∞ ≦ 2.2 (1a)
However, Y = 2 × f × sin (θ / 2) (85 ° ≦ θ ≦ 90 °)
Many common screen sizes have an aspect ratio of 2: 3. In order to include from the circumference fisheye to the diagonal fisheye in the screen size of this ratio, at least the numerical value of the conditional expression (1) is preferably 1.8 or more.

本発明に係る遮光部材ＬＣはその特徴を活かし、図２（ｅ）に示すように望遠側においての光束Ｌ（Ｔ）にはあまり影響を与えず、広角側の光束Ｌ（Ｗ）のみを多く遮光するように配置している。図２（ｅ）に示すように、遮光部材ＬＣは望遠端において最軸外光束（半画角９０度）の光束を遮光しなく、広角端において最軸外光束（半画角９０度）の光束の一部を遮光する開口径よりなっている。また、広角端から望遠端におけるズーミングに際して、同じ画角の入射光が通過する光軸からの距離（高さ）は変動する。このため本発明で用いる遮光部材ＬＣの内径を可変としても良い。 The light-shielding member LC according to the present invention takes advantage of its characteristics and does not significantly affect the light beam L (T) on the telephoto side as shown in FIG. 2 (e), and only the light beam L (W) on the wide-angle side is increased. It is arranged so as to be shielded from light. As shown in FIG. 2 (e), the light blocking member LC is not shield the light flux of the most off-axis light flux (a half field angle of 90 degrees) at the telephoto end, the outermost off-axis light beam at the wide angle end (half angle of 90 degrees) It has an aperture diameter that blocks a part of the light beam. Further, during zooming from the wide-angle end to the telephoto end, the distance (height) from the optical axis through which incident light having the same angle of view passes varies. Therefore, the inner diameter of the light shielding member LC used in the present invention may be variable.

Claims

In order from the object side to the image side, the first lens group having a negative refractive power and the second lens group having a positive refractive power are provided, and the first lens group and the second lens are used for zooming from the wide angle end to the telephoto end. In an imaging apparatus having a zoom lens in which a group moves on an optical axis and an interval between adjacent lens groups changes , and an imaging element that receives an image formed by the zoom lens,
The imaging range at the wide-angle end and the telephoto end are different, and the formed image heights at the wide-angle end and the telephoto end of a light beam emitted from an object located at infinity and incident at a shooting half angle of view θ are respectively Yw∞ and Yt∞. The wide angle when the image height at the wide-angle end and the telephoto end of the light beam emitted from an object located at a close distance and incident at a shooting half angle of view θ is focused on an object at Yw, Yt, and infinity, respectively. When the focal lengths of the entire system at the end and the telephoto end are fw∞ and ft∞, respectively, the focal length fi is fw∞ <fi <ft∞.
In the zoom position that satisfies
When the image height at the focal length fi of the light beam incident at the shooting half angle of view θ is Yi,
1.80 ≦ Yt∞ / Yw∞ ≦ 2.5
1.60 ≦ Yt close / Yw close <1.80
However, Yi = 2 × fi × sin (θ / 2) (85 ° ≦ θ ≦ 90 °)
An imaging apparatus characterized by satisfying the following conditional expression and having a light shielding member with a variable or fixed aperture diameter inside the first lens group.

When the focal lengths of the entire system at the wide-angle end and the telephoto end when focusing on an object at infinity are fw∞ and ft∞, respectively, the focal length fi is fw∞ <fi <ft∞.
In the zoom position that satisfies
The imaging half angle of the light beam focused on the imaging image height Y in when focusing on an object at infinity Shita∞, the light beam forms an image on the imaging image height Y in when focusing on a close object When the shooting half angle of view is θ mod,
0.67 <θ∞ / θmod ≦ 1
The imaging apparatus according to claim 1 , wherein the following conditional expression is satisfied.

The light blocking member, an imaging apparatus according to claim 1 or 2, characterized in that arranged on the image side of the lens positioned closest to the object side in the first lens group.

A second light-shielding member that does not shield the most off-axis light beam at the wide-angle end and shields the most off-axis light beam at the telephoto end is further provided on the outer peripheral side of the lens located closest to the object side in the first lens group. The imaging apparatus according to any one of claims 1 to 3, wherein

The light shielding member shields a portion of the outermost off-axis light beam at the wide-angle end, the imaging according to any one of claims 1 to 4, characterized in the go, such shields the outermost off-axis light beam at the telephoto end apparatus.

In order from the object side to the image side, it has a first lens group having a negative refractive power and a second lens group having a positive refractive power,
In a zoom lens in which the first lens group and the second lens group move on the optical axis during zooming from the wide-angle end to the telephoto end, and the interval between adjacent lens groups changes .
The inside of the first lens group, and shielding a part of the outermost off-axis light beam at the wide-angle end, the zoom lens characterized by having a light-shielding and a decoction shielding light member outermost off-axis light beam at the telephoto end.

A second light-shielding member that does not shield the most off-axis light beam at the wide-angle end and shields the most off-axis light beam at the telephoto end is further provided on the outer peripheral side of the lens located closest to the object side in the first lens group. the zoom lens according to claim 6, wherein.