JP2006309000A - Imaging optical system and imaging apparatus - Google Patents

Imaging optical system and imaging apparatus Download PDF

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JP2006309000A
JP2006309000A JP2005133426A JP2005133426A JP2006309000A JP 2006309000 A JP2006309000 A JP 2006309000A JP 2005133426 A JP2005133426 A JP 2005133426A JP 2005133426 A JP2005133426 A JP 2005133426A JP 2006309000 A JP2006309000 A JP 2006309000A
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lens
optical system
shape
imaging optical
imaging
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Takao Saito
隆夫 齊藤
Koji Masuda
浩二 増田
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Ricoh Co Ltd
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Ricoh Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To obtain an imaging optical system capable of varying the degree of soft focus without causing the fluctuation of an angle of view (focal distance) and a focal position when switching a normal photographing state and a soft focus state. <P>SOLUTION: The imaging optical system 1 forms a subject image on an imaging device. A lens L2 adjacent to a diaphragm 21 is constituted of (droplet of) a liquid lens. The liquid lens can change the shape of the lens surface of the lens L2 (droplet). By thus changing the shape, the normal photographing state and the soft focus state where larger spherical aberration is caused than in the normal photographing state are switched in the imaging optical system 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、被写体像を撮像素子上に結像するための撮像光学系、及びこの撮像光学系を備えた撮像装置に関する。   The present invention relates to an image pickup optical system for forming a subject image on an image pickup device, and an image pickup apparatus including the image pickup optical system.

従来の切換え可能な軟焦点（ソフトフォーカス）光学系では、光学系を構成するレンズの間隔を変化させることにより、通常撮影状態と軟焦点状態とを切換え、あるいは、高い空間周波数成分をカットするような部材を光学系の中に配置することにより、通常撮影状態と軟焦点状態とを切換えるようにしている（特許文献１〜８参照）。また、液状レンズについて特許文献９などに開示されている。
特開２００２−３１８３４６公報 特開２００２−３１８３４７公報 特開２００３−２９１４３公報 特開２００３−２１５４４５公報 特開２００２−３０３７８６公報 特許第３３６４９９８号 特許第３５２８１６２号 特開２００１−１０００９２公報 特開２００３−５０３０３公報 In a conventional soft focus optical system that can be switched, the distance between the lenses constituting the optical system is changed to switch between the normal photographing state and the soft focus state, or to cut a high spatial frequency component. By arranging such a member in the optical system, the normal photographing state and the soft focus state are switched (see Patent Documents 1 to 8). A liquid lens is disclosed in Patent Document 9 and the like.
JP 2002-318346 A JP 2002-318347 A JP 2003-29143 A JP 2003-215445 A JP 2002-303786 A Japanese Patent No. 3364998 Japanese Patent No. 3528162 JP 2001-100092 A JP 2003-50303 A

しかしながら、光学系を構成するレンズの間隔を変化させることにより、通常撮影状態と軟焦点状態とを切換える前述の従来技術では、レンズ間隔の変化による焦点距離の変化を別の部分の間隔を変化させることにより補償することが必要であり、また、レンズを可動とすることにより、光軸からの位置ずれが起きて光学性能が劣化するなどの問題も発生し易くなるという不具合がある。
さらに、高い空間周波数成分をカットするような部材を光学系の中に配置することにより、通常撮影状態と軟焦点状態とを切換える前述の従来技術では、レンズ間隔が変化することや可動であることの問題は発生しないものの、軟焦点の度合いは１種類固定で実現可能なものであり、軟焦点の度合いを可変とすることは非常に困難であるという不具合がある。
そこで、本発明の目的は、通常撮影状態と軟焦点状態とを切換えるのに際して、画角（焦点距離）や焦点位置の変動が発生せず、軟焦点の度合いについても可変できる撮像光学系を実現することである。 However, in the above-described prior art that switches between the normal photographing state and the soft focus state by changing the interval between the lenses constituting the optical system, the change in the focal length due to the change in the lens interval changes the interval of another part. It is necessary to compensate for this, and there is a problem that by making the lens movable, problems such as the occurrence of a positional deviation from the optical axis and the deterioration of the optical performance are likely to occur.
Furthermore, by arranging a member that cuts high spatial frequency components in the optical system, the above-mentioned conventional technology for switching between the normal photographing state and the soft focus state has a change in the lens interval and is movable. However, there is a problem that it is very difficult to make the soft focus level variable.
Therefore, an object of the present invention is to realize an imaging optical system that does not change the angle of view (focal length) or the focal position when switching between the normal shooting state and the soft focus state, and can vary the degree of soft focus. It is to be.

請求項１に記載の発明は、被写体像を撮像素子上に結像するための撮像光学系において、レンズと、該レンズのレンズ面の形状を変化させるレンズ形状可変手段を備え、前記形状変化により通常撮影状態と通常撮影状態よりも大きな球面収差を発生させた軟焦点状態とを切換えることを特徴とする。
請求項２に記載の発明は、請求項１に記載の撮像光学系において、絞りをさらに備え、前記レンズ形状可変手段は、前記形状変化を行う前記レンズを前記絞りに隣接するレンズの少なくとも一つとしていることを特徴とする。
請求項３に記載の発明は、請求項１又は２に記載の撮像光学系において、液状レンズをさらに備え、前記液状レンズの小滴が前記形状変化を行う前記レンズであり、前記レンズ形状可変手段は、前記液状レンズが有する前記小滴の形状を変えることを特徴とする。
請求項４に記載の発明は、請求項１乃至請求項３のいずれか１項に記載の撮像光学系において、形状が変化する前記レンズ面は非球面形状であることを特徴とする。
請求項５に記載の発明は、前記レンズ形状可変手段は、非球面係数の変化により前記形状の変化を発生させることを特徴とする。
請求項６に記載の発明は、被写体像を撮像素子で撮像する撮像装置において、前記被写体像を前記撮像素子上に結像するための撮像光学系として請求項１乃至請求項５のいずれか１項に記載の撮像光学系を備えていることを特徴とする。 According to a first aspect of the present invention, in an imaging optical system for forming a subject image on an imaging element, the imaging optical system includes a lens and a lens shape changing unit that changes the shape of the lens surface of the lens, and the shape change It is characterized by switching between a normal photographing state and a soft focus state in which a larger spherical aberration is generated than in the normal photographing state.
According to a second aspect of the present invention, in the imaging optical system according to the first aspect of the present invention, the lens further includes a diaphragm, and the lens shape changing unit has the lens that changes the shape as at least one of the lenses adjacent to the diaphragm. It is characterized by that.
The invention according to claim 3 is the imaging optical system according to claim 1 or 2, further comprising a liquid lens, wherein the droplet of the liquid lens changes the shape, and the lens shape changing means Is characterized by changing the shape of the droplet of the liquid lens.
According to a fourth aspect of the present invention, in the imaging optical system according to any one of the first to third aspects, the lens surface whose shape changes is an aspherical shape.
The invention according to claim 5 is characterized in that the lens shape changing means generates the change of the shape by the change of the aspheric coefficient.
According to a sixth aspect of the present invention, in the image pickup apparatus that picks up a subject image with an image pickup device, the image pickup optical system for forming the subject image on the image pickup device is any one of the first to fifth aspects. The imaging optical system according to the item is provided.

請求項１に記載の発明によれば、通常撮影状態と軟焦点状態とを切換えるのに際して、画角（焦点距離）や焦点位置の変動が発生せず、軟焦点の度合いについても可変できる撮像光学系を実現することができる。
請求項２に記載の発明によれば、効果的に球面収差の大きさを変えて軟焦点状態を実現することができる。
請求項３に記載の発明によれば、通常撮影状態と軟焦点状態とを切換えるのに際して、液状レンズにより、画角（焦点距離）や焦点位置の変動が発生せず、軟焦点の度合いについても可変できる撮像光学系を、少ない部品点数で実現することができる。
請求項４に記載の発明によれば、焦点距離、焦点位置を変化させずに球面収差の変化、即ち軟焦点状態の変化を実現することができる。
請求項５に記載の発明によれば、焦点距離、焦点位置を変化させずに、球面収差の変化、即ち軟焦点状態の変化を実現することができる。
請求項６に記載の発明によれば、請求項１乃至請求項５のいずれか１項に記載の発明と同様の効果を発揮する撮像装置を提供することができる。 According to the first aspect of the present invention, there is no change in the angle of view (focal length) or focal position when switching between the normal photographing state and the soft focus state, and the imaging optical that can vary the degree of soft focus. A system can be realized.
According to the second aspect of the present invention, the soft focus state can be realized by effectively changing the magnitude of the spherical aberration.
According to the third aspect of the present invention, when switching between the normal photographing state and the soft focus state, the liquid lens does not cause a change in the angle of view (focal length) or the focus position, and the degree of soft focus is also reduced. A variable imaging optical system can be realized with a small number of parts.
According to the fourth aspect of the present invention, it is possible to realize a change in spherical aberration, that is, a change in soft focus state without changing the focal length and the focal position.
According to the fifth aspect of the present invention, a change in spherical aberration, that is, a change in soft focus state can be realized without changing the focal length and the focal position.
According to the invention described in claim 6, it is possible to provide an imaging apparatus that exhibits the same effect as the invention described in any one of claims 1 to 5.

以下、本発明を実施するための最良の一形態について説明する。
図１は、本実施形態の撮像光学系１の構成図である。
この撮像光学系１は、被写体像をＣＣＤなどの撮像素子（いずれも図示せず）に結像するための結像光学系である。この撮像光学系１は、被写体となる物体（図示せず）側より順に、第１群は両凹レンズＬ１と両凸レンズＬ２とにより構成され、第２群は物体側より順に配置されている正レンズＬ３と負レンズＬ４とを張り合わせた張り合わせレンズＬ３４と、両凸レンズＬ５とから構成されている。
ここで、所定のレンズ形状可変手段により、撮像光学系１で絞り２１に隣接するレンズの少なくとも一つ、この例では両凸レンズＬ２は、そのレンズ面の形状を変化させることができ、このレンズ面の形状変化により、通常撮影状態と通常撮影状態よりも大きな球面収差を発生させた軟焦点状態との切換ができる。具体的には、両凸レンズＬ２を液状レンズ１１（図２、図３参照）で構成して、両凸レンズＬ２の被写体側の面を面形状可変としている。
図２は、この液状レンズ１１の拡大縦断面図であり、図３は後述の複数の電極１３の構成を示す拡大平面図である。なお、図２、図３に示すような液状レンズ１１は、例えば特許文献９などに開示されている。
図２、図３に示すように、この液状レンズ１１は、透明な絶縁層１２と、その表面上に配置された透明な流体からなる小滴ｔと、この小滴ｔから絶縁層１２により絶縁された複数の電極１３と、さらには絶縁層１２と電極１３とを支持する透明基板１４と、小滴ｔに接続された小滴電極１５と備えている。小滴電極１５の電位をＶ０、各電極１３の各電位はそれぞれＶ１〜Ｖ４とすると、これら電圧Ｖ０〜Ｖ５の電位差によって、液状レンズを前述のように駆動することができる。この電極１３、小滴電極１５と、これらの電極への電圧印加の制御により、レンズ形状可変手段を実現している。 Hereinafter, the best mode for carrying out the present invention will be described.
FIG. 1 is a configuration diagram of an imaging optical system 1 of the present embodiment.
The imaging optical system 1 is an imaging optical system for forming a subject image on an imaging element (not shown) such as a CCD. In this imaging optical system 1, a first lens is composed of a biconcave lens L <b> 1 and a biconvex lens L <b> 2 in order from an object (not shown) that is a subject, and a second lens is disposed in order from the object side. It is composed of a cemented lens L34 in which L3 and a negative lens L4 are bonded together, and a biconvex lens L5.
Here, at least one of the lenses adjacent to the stop 21 in the imaging optical system 1, in this example, the biconvex lens L <b> 2, can change the shape of the lens surface by a predetermined lens shape changing unit. By changing the shape, it is possible to switch between a normal shooting state and a soft focus state in which a larger spherical aberration is generated than in the normal shooting state. Specifically, the biconvex lens L2 is constituted by the liquid lens 11 (see FIGS. 2 and 3), and the surface of the biconvex lens L2 on the subject side is variable in surface shape.
FIG. 2 is an enlarged vertical sectional view of the liquid lens 11, and FIG. 3 is an enlarged plan view showing a configuration of a plurality of electrodes 13 described later. The liquid lens 11 as shown in FIGS. 2 and 3 is disclosed in, for example, Patent Document 9.
As shown in FIGS. 2 and 3, the liquid lens 11 includes a transparent insulating layer 12, a droplet t made of a transparent fluid disposed on the surface thereof, and the insulating layer 12 from the droplet t. A plurality of electrodes 13, a transparent substrate 14 that supports the insulating layer 12 and the electrode 13, and a droplet electrode 15 connected to the droplet t. If the potential of the droplet electrode 15 is V0 and the potentials of the electrodes 13 are V1 to V4, respectively, the liquid lens can be driven as described above by the potential difference between these voltages V0 to V5. The lens shape variable means is realized by controlling the electrode 13 and the droplet electrode 15 and the voltage application to these electrodes.

次に、液状レンズ１１の動作について説明する。
小滴ｔと絶縁層１２とがなす接触角θ１は、小滴ｔと絶縁層１２と周囲の空気との相互の界面張力から決定される。そして小滴ｔと電極１３との間に電位差が存在しない場合（Ｖ０＝Ｖ１＝Ｖ２＝Ｖ３＝Ｖ４）には、小滴ｔは、小滴ｔの体積Ｖｏｌと接触角θ１とにより規定される形状（図２、図３に実線で示している）を維持し、小滴ｔの曲率半径Ｒ１が定まる。次に、Ｖ０とＶ１からＶ４との間にそれぞれ等しい電圧を印加すると、接触角θが変化することにより、小滴ｔの面形状が変化する。
本実施の形態の撮像光学系１では、被写体となる被測定物側から第２番目のレンズとなる両凸レンズＬ２の像側の面を形状可変な液状レンズ１１としている。これは、この面の形状変化が球面収差に与える影響が大きいからである。逆にいえば、この面で球面収差の補正の効果が大きいからであるといえる。通常、絞り２１に隣接するレンズへの光束はレンズの有効径に比べて大きく広がっており、また、各像高の光束がレンズの同じような場所を通過し、この結果、球面収差の補正効果が絞り２１に隣接するレンズにおいて大きい。従って、球面収差の大きさを変えて軟焦点状態を実現する為には、絞り２１に隣接するレンズにおいて形状変化を起こすのが効果的である。
このとき、球面形状（曲率半径）の変化が起こると、撮像光学系１全体の焦点距離が変化してしまい、画角が変わるとともに、焦点位置がずれてしまう。このような事態を避ける為に、形状が変化する面を非球面形状とし、近軸曲率半径を保ったまま、非球面係数のみを変化させることにより、焦点距離、焦点位置を変化させずに、“球面収差の変化＝軟焦点状態”を実現可能である。ここで、前述のＶ１〜Ｖ４の印加電圧を適宜変化させることにより面形状の変化量を変えれば、球面収差の大きさ、即ち軟焦点の度合いを変化させることも可能である。 Next, the operation of the liquid lens 11 will be described.
The contact angle θ1 formed by the droplet t and the insulating layer 12 is determined from the interfacial tension between the droplet t, the insulating layer 12, and the surrounding air. When there is no potential difference between the droplet t and the electrode 13 (V0 = V1 = V2 = V3 = V4), the droplet t is defined by the volume Vol of the droplet t and the contact angle θ1. The shape (shown by a solid line in FIGS. 2 and 3) is maintained, and the radius of curvature R1 of the droplet t is determined. Next, when an equal voltage is applied between V0 and V1 to V4, the contact angle θ changes, whereby the surface shape of the droplet t changes.
In the imaging optical system 1 according to the present embodiment, the image-side surface of the biconvex lens L2 that is the second lens from the measured object side that is the subject is the liquid lens 11 whose shape is variable. This is because a change in the shape of this surface has a great influence on the spherical aberration. Conversely, it can be said that this surface has a great effect of correcting the spherical aberration. Usually, the light flux to the lens adjacent to the stop 21 is greatly spread compared to the effective diameter of the lens, and the light flux of each image height passes through the same place of the lens, and as a result, the effect of correcting spherical aberration Is large in the lens adjacent to the stop 21. Therefore, in order to realize a soft focus state by changing the magnitude of the spherical aberration, it is effective to cause a shape change in the lens adjacent to the stop 21.
At this time, when the spherical shape (curvature radius) changes, the focal length of the entire imaging optical system 1 changes, the angle of view changes, and the focal position shifts. In order to avoid such a situation, the surface where the shape changes is an aspheric shape, and the focal length and the focal position are not changed by changing only the aspheric coefficient while maintaining the paraxial curvature radius. “Spherical aberration change = soft focus state” can be realized. Here, if the amount of change in the surface shape is changed by appropriately changing the applied voltages V1 to V4, the magnitude of the spherical aberration, that is, the degree of soft focus can be changed.

図１に示す撮像光学系１において、最も像面２２側の屈折力を有する両凸レンズＬ５と像面２２との間にある平行平板２３は、水晶ローパスフィルター、赤外カットフィルター等のフィルター類、あるいはＣＣＤなどの撮像素子（図示せず）を保護する保護ガラス、などである。また、物体側から第２番目の両凸レンズＬ２の物体側面と、第３番目の正レンズＬ３の物体側面と、第５番目の両凸レンズＬ５の像側面とはガラスレンズの上に樹脂材料により非球面部を形成した複合非球面レンズで、前述のとおり、両凸レンズＬ２の像側面は面形状が可変である液状レンズ１１（の小滴ｔ）によって構成されている。
非球面は光軸からの高さをＨとしたとき、面頂点からの光軸方向の変位量をＳとして次に式で表される。ただし、Ｒは曲率半径、Ａ2iは非球面係数である。

Figure 2006309000
撮像光学系１において、焦点距離ｆ＝７．９ｍｍ、ＦNO＝２．６、半画角ω＝３１°であるときに、表１〜３には非球面係数、軟焦点時非球面係数を示す。また、図４には通常撮影状態での収差図を示し、図５には軟焦点状態での収差図を示す。











In the imaging optical system 1 shown in FIG. 1, the parallel flat plate 23 between the biconvex lens L5 having the refractive power closest to the image plane 22 and the image plane 22 includes filters such as a crystal low-pass filter and an infrared cut filter. Or it is protective glass etc. which protect image pick-up elements (not shown), such as CCD. Further, the object side surface of the second biconvex lens L2 from the object side, the object side surface of the third positive lens L3, and the image side surface of the fifth biconvex lens L5 are made of a resin material on the glass lens. As described above, the image side surface of the biconvex lens L2 is composed of the liquid lens 11 (the droplet t thereof) having a variable surface shape.
The aspherical surface is expressed by the following equation, where S is the amount of displacement in the optical axis direction from the surface vertex, where H is the height from the optical axis. However, R is a radius of curvature and A 2i is an aspherical coefficient.
Figure 2006309000
 In the imaging optical system 1, when the focal length f = 7.9 mm, F NO = 2.6, and the half angle of view ω = 31 °, Tables 1 to 3 show aspheric coefficients and soft focus aspheric coefficients. Show. FIG. 4 shows aberration diagrams in the normal photographing state, and FIG. 5 shows aberration diagrams in the soft focus state.











（表１）
面 曲率半径 間隔 Nd Vd
1 -9.81900 2.00000 1.53172 48.84
2 5.04600 1.12000 1.00000
3 14.91600 0.05000 1.50703 53.43
4 13.12700 2.88000 1.77250 49.62
5 -6.56300 0.02000 1.50703 53.43
6 -8.07400 1.26000 1.00000
7 0.00000 1.77000 1.00000
8 10.28300 0.02000 1.50703 53.43
9 6.67100 3.00000 1.69680 55.46
10 -6.67100 1.00000 1.68893 31.16
11 6.67100 0.50000 1.00000
12 28.59000 2.52000 1.62041 60.34
13 -8.59900 0.02000 1.50703 53.43
14 -9.22900 1.00000 1.00000
15 0.00000 4.11000 1.51680 64.20
16 0.00000 1.00000
（表２）
非球面係数
面 K A4 A6 A8 A10
3 -9.89000 7.76600E-04 -3.92900E-05 7.38300E-06 -3.69300E-07
6 -3.07500 -1.23100E-04 -4.48800E-05 4.38700E-06 -3.02700E-07
8 8.38400 -4.88300E-05 -8.03400E-05 3.57900E-06 -9.08700E-07
14 -20.18500 -1.94300E-03 2.82100E-04 -1.74600E-05 6.54200E-07
（表３）
軟焦点時非球面係数
面 K A4 A6 A8 A10
6 -3.07500 -1.23100E-04 -4.48800E-05 5.58700E-06 -3.02700E-07

図６は、被写体像をＣＣＤなどの撮像素子上に結像するための撮像光学系として、前述の撮像光学系１を備えたデジタルカメラ１０１の斜視図である。デジタルカメラ１０１は、本発明の撮像装置を実施するものである。
図６において、符号１０２は光学ファインダー、符号１０３は撮影レンズユニット、符号１０４はＬＣＤ表示部、符号１０５はメインスイッチ、符号１０６はレリーズ釦、符号１０７はＬＣＤモニタである。 (Table 1)
Surface curvature radius spacing Nd Vd
1 -9.81900 2.00000 1.53172 48.84
2 5.04600 1.12000 1.00000
3 14.91600 0.05000 1.50703 53.43
4 13.12700 2.88000 1.77250 49.62
5 -6.56300 0.02000 1.50703 53.43
6 -8.07400 1.26000 1.00000
7 0.00000 1.77000 1.00000
8 10.28300 0.02000 1.50703 53.43
9 6.67100 3.00000 1.69680 55.46
10 -6.67100 1.00000 1.68893 31.16
11 6.67100 0.50000 1.00000
12 28.59000 2.52000 1.62041 60.34
13 -8.59900 0.02000 1.50703 53.43
14 -9.22900 1.00000 1.00000
15 0.00000 4.11000 1.51680 64.20
16 0.00000 1.00000
(Table 2)
Aspheric coefficient
Face KA 4 A 6 A 8 A 10
3 -9.89000 7.76600E-04 -3.92900E-05 7.38300E-06 -3.69300E-07
6 -3.07500 -1.23100E-04 -4.48800E-05 4.38700E-06 -3.02700E-07
8 8.38400 -4.88300E-05 -8.03400E-05 3.57900E-06 -9.08700E-07
14 -20.18500 -1.94300E-03 2.82100E-04 -1.74600E-05 6.54200E-07
(Table 3)
Aspheric coefficient at soft focus Surface KA 4 A 6 A 8 A 10
6 -3.07500 -1.23100E-04 -4.48800E-05 5.58700E-06 -3.02700E-07

FIG. 6 is a perspective view of a digital camera 101 including the above-described imaging optical system 1 as an imaging optical system for forming a subject image on an imaging element such as a CCD. The digital camera 101 implements the imaging apparatus of the present invention.
In FIG. 6, reference numeral 102 denotes an optical viewfinder, reference numeral 103 denotes a photographing lens unit, reference numeral 104 denotes an LCD display unit, reference numeral 105 denotes a main switch, reference numeral 106 denotes a release button, and reference numeral 107 denotes an LCD monitor.

本発明の一実施形態である撮像光学系の構成図である。It is a block diagram of the imaging optical system which is one Embodiment of this invention. 撮像光学系の液状レンズの拡大縦断面図である。It is an expanded vertical sectional view of the liquid lens of an imaging optical system. 撮像光学系の液状レンズの拡大平面図である。It is an enlarged plan view of a liquid lens of an imaging optical system. 撮像光学系の通常撮影状態での収差図である。It is an aberration diagram in the normal photographing state of the imaging optical system. 撮像光学系の軟焦点状態での収差図である。It is an aberration diagram in the soft focus state of the imaging optical system. 本発明の一実施形態であるデジタルカメラの斜視図である。1 is a perspective view of a digital camera that is an embodiment of the present invention.

符号の説明Explanation of symbols

１ 撮像光学系、１１ 液状レンズ、２１ 絞り、１０１ 撮像装置、ｔ 小滴、Ｌ２ レンズ   DESCRIPTION OF SYMBOLS 1 Imaging optical system, 11 Liquid lens, 21 Aperture, 101 Imaging device, t droplet, L2 lens

Claims (6)

被写体像を撮像素子上に結像するための撮像光学系において、レンズと、該レンズのレンズ面の形状を変化させるレンズ形状可変手段を備え、前記形状変化により通常撮影状態と通常撮影状態よりも大きな球面収差を発生させた軟焦点状態とを切換えることを特徴とする撮像光学系。   An imaging optical system for forming a subject image on an imaging device includes a lens and a lens shape changing unit that changes the shape of the lens surface of the lens. An imaging optical system characterized by switching between a soft focus state in which a large spherical aberration is generated. 絞りをさらに備え、前記レンズ形状可変手段は、前記形状変化を行う前記レンズを前記絞りに隣接するレンズの少なくとも一つとしていることを特徴とする請求項１に記載の撮像光学系。   The imaging optical system according to claim 1, further comprising a diaphragm, wherein the lens shape changing unit uses the lens that changes the shape as at least one lens adjacent to the diaphragm. 液状レンズをさらに備え、前記液状レンズの小滴が前記形状変化を行う前記レンズであり、前記レンズ形状可変手段は、前記液状レンズが有する前記小滴の形状を変えることを特徴とする請求項１又は２に記載の撮像光学系。   The liquid lens is further provided, wherein the droplet of the liquid lens is the lens that changes the shape, and the lens shape changing unit changes the shape of the droplet of the liquid lens. Or the imaging optical system of 2. 形状が変化する前記レンズ面は非球面形状であることを特徴とする請求項１乃至請求項３のいずれか１項に記載の撮像光学系。   The imaging optical system according to claim 1, wherein the lens surface whose shape changes is an aspherical shape. 前記レンズ形状可変手段は、非球面係数の変化により前記形状の変化を発生させることを特徴とする請求項４に記載の撮像光学系。   The imaging optical system according to claim 4, wherein the lens shape changing unit generates the change in shape by a change in an aspheric coefficient. 被写体像を撮像素子で撮像する撮像装置において、前記被写体像を前記撮像素子上に結像するための撮像光学系として請求項１乃至請求項５のいずれか１項に記載の撮像光学系を備えていることを特徴とする撮像装置。   The imaging apparatus which images a to-be-photographed image with an image sensor, The imaging optical system of any one of Claim 1 thru | or 5 is provided as an imaging optical system for forming the said to-be-photographed image on the said image sensor. An imaging device characterized by comprising:
JP2005133426A 2005-04-28 2005-04-28 Imaging optical system and imaging apparatus Pending JP2006309000A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009134023A (en) * 2007-11-29 2009-06-18 Kyocera Corp Imaging device and information code reading device
JP2010008794A (en) * 2008-06-27 2010-01-14 Kyocera Corp Image pickup apparatus and electronic device
CN110716289A (en) * 2019-12-12 2020-01-21 江西联创电子有限公司 Optical imaging lens

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009134023A (en) * 2007-11-29 2009-06-18 Kyocera Corp Imaging device and information code reading device
JP2010008794A (en) * 2008-06-27 2010-01-14 Kyocera Corp Image pickup apparatus and electronic device
JP4658162B2 (en) * 2008-06-27 2011-03-23 京セラ株式会社 Imaging apparatus and electronic apparatus
CN110716289A (en) * 2019-12-12 2020-01-21 江西联创电子有限公司 Optical imaging lens
WO2021114458A1 (en) * 2019-12-12 2021-06-17 江西联创电子有限公司 Optical imaging lens and imaging apparatus

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