JP2014021312A5 - Optical system and imaging apparatus - Google Patents
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本発明の一側面としての光学系は、変倍が可能であり、物体側から像側に順に第１レンズ群と第２レンズ群を含み、変倍に際して前記第１レンズ群と前記第２レンズ群の少なくとも一方が移動し、撮像装置に設けられた撮像素子上に物体像を形成し、以下の条件を満足することを特徴とする。
|(ΔTMyu＋ΔTMyl)／(ΔWMyu＋ΔWMyl)|＜０．６７
０．７５＜|(ΔWMyu＋ΔWMyl)|／２Ｐ＜１６．０
ただし、前記光学系における望遠端よりも広角端に近い中間焦点距離を広角側中間焦点距離とし、前記広角端よりも前記望遠端に近い中間焦点距離を望遠側中間焦点距離とし、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、
ΔWMyuは、前記広角側中間焦点距離において、前記８割像高に到達する前記７割上線のうちｄ線の横収差量であり、
ΔWMylは、前記広角側中間焦点距離において、前記８割像高に到達する前記７割下線のうちｄ線に対する横収差量であり、
ΔＴMyuは、前記望遠側中間焦点距離において、前記８割像高に到達する前記７割上線のうち前記ｄ線に対する横収差量であり、
ΔＴMylは、前記望遠側中間焦点距離において、前記８割像高に到達する前記７割下線のうちｄ線に対する横収差量であり、
Ｐは前記撮像素子の画素ピッチであり、
ｆｗを前記光学系の前記広角端での焦点距離とし、ｆｔを前記光学系の前記望遠端での焦点距離とし、ｆｍ＝√（ｆｗ×ｆｔ）とするとき、
前記広角側中間焦点距離ｆｗｍは、ｆｗｍ＝√（ｆｗ×ｆｍ）であり、
前記望遠側中間焦点距離ｆｔｍは、ｆｔｍ＝√（ｆｍ×ｆｔ）である。
An optical system according to an aspect of the present invention is capable of zooming and includes a first lens group and a second lens group in order from the object side to the image side, and the first lens group and the second lens in zooming At least one of the groups moves to form an object image on an image sensor provided in the image pickup apparatus, and the following conditions are satisfied.
| (ΔTMyu + ΔTMyl) / (ΔWMyu + ΔWMyl) | <0.67
0.75 <| (ΔWMyu + ΔWMyl) | / 2P <16.0
However, the intermediate focal length and the wide-angle side intermediate focal length closer to the wide-angle end than at the telephoto end in an optical system, wherein the intermediate focal length closer to the telephoto end than at the wide angle end to the telephoto side intermediate focal length, of the optical system maximum image height 80% of the image height of the 80% image height, respectively the upper line and the underline, 70% on lines and 70% underlined through the 70% position of the effective beam diameter of the meridional rays passing through the optical system and when,
ΔWMyu is the lateral aberration amount of the d line out of the 70% upper line that reaches the 80% image height at the intermediate focal length on the wide angle side,
ΔWMyl is the amount of lateral aberration with respect to the d-line among the 70% underline that reaches the 80% image height at the intermediate focal length on the wide angle side,
ΔTMyu is the amount of lateral aberration with respect to the d-line among the 70% above line reaching the 80% image height at the telephoto-side intermediate focal length;
ΔTMyl is the amount of lateral aberration with respect to the d-line among the 70% underline that reaches the 80% image height at the telephoto side intermediate focal length;
P is the pixel pitch of the image sensor,
When the fw is a focal length of at the wide angle end of the optical system, a ft a focal length at the telephoto end of the optical system, and fm = √ (fw × ft) ,
The wide-angle-side intermediate focal length fwm is fwm = √ (fw × fm),
The telephoto side intermediate focal length ftm is ftm = √ (fm × ft).
また、本発明の他の一側面としての光学系は、変倍が可能であり、物体側から像側に順に第１レンズ群と第２レンズ群を含み、変倍に際して前記第１レンズ群と前記第２レンズ群の少なくとも一方が移動し、撮像装置に設けられた撮像素子上に物体像を形成し、以下の条件を満足することを特徴とする。
Ｓｗｍ／Ｓｔｍ＜０．６７
０．７５＜Ｓｗｍ／２Ｐ＜１６．０
ただし、前記光学系における望遠端よりも広角端に近い中間焦点距離を広角側中間焦点距離とし、前記広角端よりも前記望遠端に近い中間焦点距離を望遠側中間焦点距離とし、該光学系の最大像高の８割の像高を８割像高とし、該光学系を通過して前記８割像高に到達するｄ線に対するメリジオナル方向でのＭＴＦがピークとなる位置での該ｄ線の点像強度分布において有効光束径の７割の位置までの光束が形成するスポットの径を、７割スポット径とするとき、
Ｓｗｍは、前記広角側中間焦点距離における前記７割スポット径であり、
Ｓｔｍは、前記望遠側中間焦点距離における前記７割スポット径であり、
Ｐは前記撮像素子の画素ピッチであり、
ｆｗを前記光学系の前記広角端での焦点距離とし、ｆｔを前記光学系の前記望遠端での焦点距離とし、ｆｍ＝√（ｆｗ×ｆｔ）とするとき、
前記広角側中間焦点距離ｆｗｍは、ｆｗｍ＝√（ｆｗ×ｆｍ）であり、
前記望遠側中間焦点距離ｆｔｍは、ｆｔｍ＝√（ｆｍ×ｆｔ）である。
なお、上記いずれかの光学系により形成された物体像を撮像する撮像素子と、該撮像素子から入力された入力画像に対して、光学系の収差に応じたフィルタ値を有する画像回復フィルタを用いて画像回復処理を行う画像処理部とを有する撮像装置も、本発明の他の一側面を構成する。
An optical system according to another aspect of the present invention is capable of zooming and includes a first lens group and a second lens group in order from the object side to the image side. At least one of the second lens groups is moved to form an object image on an image sensor provided in the image pickup apparatus, and the following conditions are satisfied.
Swm / Stm <0.67
0.75 <Swm / 2P <16.0
However, the intermediate focal length and the wide-angle side intermediate focal length closer to the wide-angle end than at the telephoto end in an optical system, wherein the intermediate focal length closer to the telephoto end than at the wide angle end to the telephoto side intermediate focal length, of the optical system 80% of the maximum image height of the image height as a 80% image height, MTF of the meridional direction with respect to the d-line which passes through the optical system to reach the 80% image height of the d-line at the position where the peak When the spot diameter formed by the light beam up to 70% of the effective light beam diameter in the point image intensity distribution is the 70% spot diameter,
Swm is the 70% spot diameter at the wide-angle-side intermediate focal length,
Stm is the 70% spot diameter at the telephoto side intermediate focal length;
P is the pixel pitch of the image sensor,
When the fw is a focal length of at the wide angle end of the optical system, a ft a focal length at the telephoto end of the optical system, and fm = √ (fw × ft) ,
The wide-angle-side intermediate focal length fwm is fwm = √ (fw × fm),
The telephoto side intermediate focal length ftm is ftm = √ (fm × ft).
An image sensor that captures an object image formed by any one of the optical systems described above, and an image restoration filter that has a filter value corresponding to the aberration of the optical system for an input image input from the image sensor. An imaging device having an image processing unit that performs image restoration processing also constitutes another aspect of the present invention.
同様に、図４（Ｂ），（Ｃ）には、実施例２のズームレンズの広角端での縦収差図および横収差図を示している。また、図５（Ａ），（Ｂ）には実施例２のズームレンズの広角側中間焦点距離での縦収差図および横収差図を、図５（Ｃ），（Ｄ）には実施例２のズームレンズの望遠側中間焦点距離での縦収差図および横収差図を示している。さらに、図６（Ａ），（Ｂ）には、実施例２のズームレンズの望遠端での縦収差図および横収差図を示している。 Similarly, FIG. 4 (B), the shows a longitudinal aberration diagram and the lateral aberration diagram in a, the wide-angle end of the zoom lens of Embodiment 2 (C). Further, FIG. 5 (A), the longitudinal aberration diagram and the lateral aberration diagram of the (B) at the wide angle end the intermediate focal length of the zoom lens of Embodiment 2, FIG. 5 (C), the in (D) Example 2 FIG. 2 shows longitudinal aberration diagrams and lateral aberration diagrams at the intermediate focal length on the telephoto side of the zoom lens of FIG. Further, FIGS. 6A and 6B are longitudinal aberration diagrams and lateral aberration diagrams at the telephoto end of the zoom lens according to the second embodiment.
条件（３）の範囲を以下のようにすることがより望ましい。
Ｓｗｍ／Ｓｔｍ＜０．５５ （３）′
条件（４）は、条件（２）と同様に、ズームレンズの小型化および高倍化と画質に関する条件である。条件（４）の値がその下限を下回る場合は、変倍時の像面湾曲の変動が小さいことを表す。このことは、ズームレンズを構成する各レンズ群の屈折力が弱いことを意味し、これではズームレンズを小型化することができない。一方、条件（４）の値がその上限を超えると、発生するコマ収差が大きすぎるため、良好な画像回復が行えなくなる。
It is more desirable to set the range of condition (3) as follows.
Swm / Stm <0.55 (3) ′
The condition (4) is a condition related to downsizing and high magnification of the zoom lens and image quality, similarly to the condition (2). When the value of the condition (4) is less than the lower limit, it indicates that the variation in field curvature at the time of zooming is small. This means that the refractive power of each lens group constituting the zoom lens is weak, and this makes it impossible to downsize the zoom lens. On the other hand, if the value of the condition (4) exceeds the upper limit, the coma generated will be too large, and good image recovery cannot be performed.
Claims (7)
|(ΔTMyu＋ΔTMyl)／(ΔWMyu＋ΔWMyl)|＜０．６７
０．７５＜|(ΔWMyu＋ΔWMyl)|／２Ｐ＜１６．０
ただし、前記光学系における望遠端よりも広角端に近い中間焦点距離を広角側中間焦点距離とし、前記広角端よりも前記望遠端に近い中間焦点距離を望遠側中間焦点距離とし、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、
ΔWMyuは、前記広角側中間焦点距離において、前記８割像高に到達する前記７割上線のうちｄ線の横収差量であり、
ΔWMylは、前記広角側中間焦点距離において、前記８割像高に到達する前記７割下線のうちｄ線に対する横収差量であり、
ΔＴMyuは、前記望遠側中間焦点距離において、前記８割像高に到達する前記７割上線のうち前記ｄ線に対する横収差量であり、
ΔＴMylは、前記望遠側中間焦点距離において、前記８割像高に到達する前記７割下線のうちｄ線に対する横収差量であり、
Ｐは前記撮像素子の画素ピッチであり、
ｆｗを前記光学系の前記広角端での焦点距離とし、ｆｔを前記光学系の前記望遠端での焦点距離とし、ｆｍ＝√（ｆｗ×ｆｔ）とするとき、
前記広角側中間焦点距離ｆｗｍは、ｆｗｍ＝√（ｆｗ×ｆｍ）であり、
前記望遠側中間焦点距離ｆｔｍは、ｆｔｍ＝√（ｆｍ×ｆｔ）である。 Variable magnification is possible, and includes a first lens group and a second lens group in order from the object side to the image side. At the time of zooming, at least one of the first lens group and the second lens group moves, and the imaging apparatus An optical system characterized in that an object image is formed on a provided image sensor and the following conditions are satisfied.
| (ΔTMyu + ΔTMyl) / (ΔWMyu + ΔWMyl) | <0.67
0.75 <| (ΔWMyu + ΔWMyl) | / 2P <16.0
However, the intermediate focal length and the wide-angle side intermediate focal length closer to the wide-angle end than at the telephoto end in an optical system, wherein the intermediate focal length closer to the telephoto end than at the wide angle end to the telephoto side intermediate focal length, of the optical system maximum image height 80% of the image height of the 80% image height, respectively the upper line and the underline, 70% on lines and 70% underlined through the 70% position of the effective beam diameter of the meridional rays passing through the optical system and when,
ΔWMyu is the lateral aberration amount of the d line out of the 70% upper line that reaches the 80% image height at the intermediate focal length on the wide angle side,
ΔWMyl is the amount of lateral aberration with respect to the d-line among the 70% underline that reaches the 80% image height at the intermediate focal length on the wide angle side,
ΔTMyu is the amount of lateral aberration with respect to the d-line among the 70% above line reaching the 80% image height at the telephoto-side intermediate focal length;
ΔTMyl is the amount of lateral aberration with respect to the d-line among the 70% underline that reaches the 80% image height at the telephoto side intermediate focal length;
P is the pixel pitch of the image sensor,
When the fw is a focal length of at the wide angle end of the optical system, a ft a focal length at the telephoto end of the optical system, and fm = √ (fw × ft) ,
The wide-angle-side intermediate focal length fwm is fwm = √ (fw × fm),
The telephoto side intermediate focal length ftm is ftm = √ (fm × ft).
Ｓｗｍ／Ｓｔｍ＜０．６７
０．７５＜Ｓｗｍ／２Ｐ＜１６．０
ただし、前記光学系における望遠端よりも広角端に近い中間焦点距離を広角側中間焦点距離とし、前記広角端よりも前記望遠端に近い中間焦点距離を望遠側中間焦点距離とし、該光学系の最大像高の８割の像高を８割像高とし、該光学系を通過して前記８割像高に到達するｄ線に対するメリジオナル方向でのＭＴＦがピークとなる位置での該ｄ線の点像強度分布において有効光束径の７割の位置までの光束が形成するスポットの径を、７割スポット径とするとき、
Ｓｗｍは、前記広角側中間焦点距離における前記７割スポット径であり、
Ｓｔｍは、前記望遠側中間焦点距離における前記７割スポット径であり、
Ｐは前記撮像素子の画素ピッチであり、
ｆｗを前記光学系の前記広角端での焦点距離とし、ｆｔを前記光学系の前記望遠端での焦点距離とし、ｆｍ＝√（ｆｗ×ｆｔ）とするとき、
前記広角側中間焦点距離ｆｗｍは、ｆｗｍ＝√（ｆｗ×ｆｍ）であり、
前記望遠側中間焦点距離ｆｔｍは、ｆｔｍ＝√（ｆｍ×ｆｔ）である。 Variable magnification is possible, and includes a first lens group and a second lens group in order from the object side to the image side. At the time of zooming, at least one of the first lens group and the second lens group moves, and the imaging apparatus An optical system characterized in that an object image is formed on a provided image sensor and the following conditions are satisfied.
Swm / Stm <0.67
0.75 <Swm / 2P <16.0
However, the intermediate focal length and the wide-angle side intermediate focal length closer to the wide-angle end than at the telephoto end in an optical system, wherein the intermediate focal length closer to the telephoto end than at the wide angle end to the telephoto side intermediate focal length, of the optical system 80% of the maximum image height of the image height as a 80% image height, MTF of the meridional direction with respect to the d-line which passes through the optical system to reach the 80% image height of the d-line at the position where the peak When the spot diameter formed by the light beam up to 70% of the effective light beam diameter in the point image intensity distribution is the 70% spot diameter,
Swm is the 70% spot diameter at the wide-angle-side intermediate focal length,
Stm is the 70% spot diameter at the telephoto side intermediate focal length;
P is the pixel pitch of the image sensor,
When the fw is a focal length of at the wide angle end of the optical system, a ft a focal length at the telephoto end of the optical system, and fm = √ (fw × ft) ,
The wide-angle-side intermediate focal length fwm is fwm = √ (fw × fm),
The telephoto side intermediate focal length ftm is ftm = √ (fm × ft).
０．３０＜ｆ１／ｆｔ＜１．２０
−０．２０＜ｆ２／ｆｔ＜−０．０３ 4. The optical system according to claim 3, wherein the following condition is satisfied, where f1 is a focal length of the first lens group and f2 is a focal length of the second lens group.
0.30 <f1 / ft <1.20
−0.20 <f2 / ft <−0.03
−１．２０＜ｆ１／ｆｔ＜−０．３０
０．２０＜ｆ２／ｆｔ＜１．１０ 6. The optical system according to claim 5, wherein when the focal length of the first lens group is f1 and the focal length of the second lens group is f2, the following condition is satisfied.
−1.20 <f1 / ft <−0.30
0.20 <f2 / ft <1.10
該撮像素子から入力された入力画像に対して、前記光学系の収差に応じたフィルタ値を有する画像回復フィルタを用いて画像回復処理を行う画像処理部とを有することを特徴とする撮像装置。 An imaging device that captures an object image formed by the optical system according to any one of claims 1 to 6,
An image processing apparatus comprising: an image processing unit that performs an image restoration process on an input image input from the image sensor using an image restoration filter having a filter value corresponding to the aberration of the optical system .
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| JP2012160421A JP5649621B2 (en) | 2012-07-19 | 2012-07-19 | Optical system and imaging apparatus |
| US13/941,991 US8976271B2 (en) | 2012-07-19 | 2013-07-15 | Optical system and image pickup apparatus |
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| JP2016156903A (en) * | 2015-02-24 | 2016-09-01 | 株式会社ニコン | Zoom lens, optical device, and method for manufacturing zoom lens |
| WO2016047129A1 (en) | 2014-09-24 | 2016-03-31 | 株式会社ニコン | Zoom lens, optical device and method of manufacturing zoom lens |
| JP6467900B2 (en) * | 2014-12-16 | 2019-02-13 | リコーイメージング株式会社 | Zoom lens system |
| JP6240811B2 (en) | 2015-04-16 | 2017-11-29 | 富士フイルム株式会社 | Imaging apparatus, image processing apparatus, image processing method, program, and recording medium |
| JP6259165B2 (en) | 2015-04-16 | 2018-01-10 | 富士フイルム株式会社 | Imaging apparatus, image processing apparatus, image processing method, program, and recording medium |
| JP7150475B2 (en) * | 2018-05-24 | 2022-10-11 | キヤノン株式会社 | ZOOM LENS AND IMAGING DEVICE HAVING THE SAME |
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| JP2008172321A (en) * | 2007-01-09 | 2008-07-24 | Olympus Imaging Corp | Image pickup device for performing electric image recovery processing |
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