JP2014021313A5

JP2014021313A5 -

Info

Publication number: JP2014021313A5
Application number: JP2012160422A
Authority: JP
Filing date: 2012-07-19
Publication date: 2014-06-26
Anticipated expiration: 2032-07-19

Description

本発明の一側面としての光学系は、焦点調節に際して移動するフォーカスレンズ群と他のレンズ群を含み、撮像装置に設けられた撮像素子上に物体像を形成する光学系であって、以下の条件を満足することを特徴とする。
１＜｜Δyum＋Δylm｜／｜Δyui＋Δyli｜＜１２
２＜｜（Δyum＋Δylm）｜／２ｐ＜６
ただし、該光学系の最大像高の８割の像高を８割像高とし、該光学系を通過するメリジオナル光線のうち有効光束径の７割の位置を通る上線および下線をそれぞれ、７割上線および７割下線とするとき、Δyumは、中間物体距離に対する合焦状態において、８割像高に到達する７割上線のうちｄ線の横収差量であり、Δylmは、中間物体距離に対する合焦状態において、８割像高に到達する７割下線のうちｄ線の横収差量であり、Δyuiは、無限遠物体距離に対する合焦状態において、８割像高に到達する７割上線のうちｄ線の横収差量であり、Δyliは、無限遠物体距離に対する合焦状態において、８割像高に到達する７割下線のうちｄ線の横収差量であり、Ｐは前記撮像素子の画素ピッチであり、前記中間物体距離は、
（前記光学系全体の焦点距離／前記撮像素子の対角長）×５２０
である。 An optical system according to an aspect of the present invention is an optical system that includes a focus lens group that moves during focus adjustment and another lens group, and that forms an object image on an image sensor provided in an image pickup apparatus . It satisfies the conditions.
1 <| Δyum + Δylm | / | Δyui + Δyli | <12
2 <| (Δyum + Δylm) | / 2p <6
However, an image height of 80% of the maximum image height of the optical system is set to 80% image height, and an upper line and an underline passing through a position of 70% of the effective light beam diameter among meridional rays passing through the optical system are 70% respectively. When the upper line and the underline are 70%, Δyum is the amount of lateral aberration of the d-line among the 70% overline that reaches 80% image height in the focused state with respect to the intermediate object distance, and Δylm is the alignment with respect to the intermediate object distance. The amount of lateral aberration of the d-line among the 70% underline that reaches 80% image height in the focus state, and Δyui is the value of the 70% overline that reaches 80% image height in the focused state for the object distance at infinity. The amount of lateral aberration of the d-line, Δyli is the amount of lateral aberration of the d-line among the 70% underline that reaches 80% image height in the focused state with respect to the object distance at infinity, and P is the pixel of the image sensor. Pitch, and the intermediate object distance is
(Focal length of the entire optical system / diagonal length of the image sensor) × 520
It is.

Claims

An optical system that includes a focus lens group that moves during focus adjustment and another lens group, and that forms an object image on an image sensor provided in the imaging device ,
An optical system characterized by satisfying the following conditions.
1 <| Δyum + Δylm | / | Δyui + Δyli | <12
2 <| (Δyum + Δylm) | / 2p <6
However, an image height of 80% of the maximum image height of the optical system is set to 80% image height, and an upper line and an underline passing through a position of 70% of the effective beam diameter of meridional rays passing through the optical system are 70% respectively. When overline and 70% underline,
Δyum is the amount of lateral aberration of the d-line in the 70% upper line that reaches the 80% image height in the focused state with respect to the intermediate object distance.
Δylm is a lateral aberration amount of the d-line among the 70% underline that reaches the 80% image height in a focused state with respect to the intermediate object distance,
Δyui is the amount of lateral aberration of the d-line in the 70% upper line that reaches the 80% image height in the focused state with respect to the object distance at infinity,
Δyli is the lateral aberration amount of the d-line among the 70% underline that reaches the 80% image height in a focused state with respect to the object distance at infinity,
P is the pixel pitch of the image sensor,
The intermediate object distance is
(Focal length of the entire optical system / diagonal length of the image sensor) × 520
It is.

2. The optical system according to claim 1, further comprising a first lens group having a positive refractive power and a second lens group having a negative refractive power in order from the object side.

An imaging device for imaging an object image formed by the optical system according to claim 1 or 2,
An image processing unit that generates an image using an output from the image sensor and performs an image restoration process on the image using an image restoration filter having a filter value corresponding to the aberration of the optical system. An imaging apparatus characterized by the above.