JP2001033701A - Zoom lens and camera provided with zoom lens - Google Patents
Zoom lens and camera provided with zoom lensInfo
- Publication number
- JP2001033701A JP2001033701A JP20174199A JP20174199A JP2001033701A JP 2001033701 A JP2001033701 A JP 2001033701A JP 20174199 A JP20174199 A JP 20174199A JP 20174199 A JP20174199 A JP 20174199A JP 2001033701 A JP2001033701 A JP 2001033701A
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- JP
- Japan
- Prior art keywords
- lens
- lens group
- refractive power
- zoom
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ズームレンズ及び
ズームレンズ付きカメラに係わり、さらに詳しくは固体
撮像素子を用いるのに適したズームレンズ、及び、前記
ズームレンズを有したズームレンズ付きカメラに関す
る。[0001] 1. Field of the Invention [0002] The present invention relates to a zoom lens and a camera with a zoom lens, and more particularly to a zoom lens suitable for using a solid-state image sensor and a camera with a zoom lens having the zoom lens.
【０００２】[0002]
【従来の技術】近年、急速に普及しているデジタルカメ
ラや従来のビデオカメラに用いられているＣＣＤ等の固
体撮像素子はレンズを通過した光が受光素子に入射する
際、受光面に対してほぼ垂直でないと受光素子が効率よ
く光を感知しない。このため、ＣＣＤ等の固体撮像素子
を用いるズームレンズでは各ズームポジションで受光面
と射出瞳位置との距離を十分にとることによって、光が
受光面にほぼ垂直に入射するようにしなくてはならな
い。2. Description of the Related Art In recent years, a solid-state imaging device such as a CCD used in a digital camera and a conventional video camera, which have been rapidly spread, has a light-receiving surface when light passing through a lens enters the light-receiving device. If it is not substantially vertical, the light receiving element will not sense light efficiently. For this reason, in a zoom lens using a solid-state image pickup device such as a CCD, the distance between the light receiving surface and the exit pupil position must be sufficient at each zoom position so that light is incident on the light receiving surface almost vertically. .
【０００３】このように各ズームポジションにおいて受
光面と射出瞳位置との距離を十分にとった３群ズームレ
ンズとして、例えば、特開平１０−３０７２５８号公報
等にみられるように、第１レンズ群が負、第２レンズ群
が正の屈折力を持つレンズが知られている。また、この
ようなズームレンズを有するカメラが知られている。As described above, as a three-unit zoom lens having a sufficient distance between the light receiving surface and the exit pupil position at each zoom position, as shown in, for example, JP-A-10-307258, the first lens unit Are known, and the second lens group has a positive refractive power. Further, a camera having such a zoom lens is known.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前記ズ
ームレンズにおいて、前記特開平１０−３０７２５８号
公報に開示している実施例に開示されているように、広
角端での最大画角の歪曲収差は−７．２から−７．５％
程度となっている。レンズの先頭が負の屈折力のレンズ
群の場合、広角端での歪曲収差の補正が十分にできなく
なるという問題がある。However, in the zoom lens, as disclosed in the embodiment disclosed in JP-A-10-307258, the distortion of the maximum angle of view at the wide-angle end is reduced. -7.2 to -7.5%
It has become about. If the head of the lens is a lens group having a negative refractive power, there is a problem that distortion at the wide-angle end cannot be sufficiently corrected.
【０００５】本発明は上記の課題に鑑みなされたもの
で、本発明の目的の１つは、歪曲収差が十分に補正でき
前玉径の小さいズームレンズを提供することにある。ま
た、本発明の他の目的の１つは、歪曲収差が十分に補正
でき前玉径の小さいズームレンズを備えたズームレンズ
付きカメラを提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a zoom lens having a small front lens diameter, which can sufficiently correct distortion. Another object of the present invention is to provide a camera with a zoom lens provided with a zoom lens having a small front lens diameter, which can sufficiently correct distortion.
【０００６】[0006]
【課題を達成するための手段】上記の目的は下記のいず
れかの手段により達成できる。The above object can be achieved by any of the following means.
【０００７】（１）物体側より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、および、少なくと
も１枚の非球面を含む第３レンズ群の３つのレンズ群を
有し、前記第１レンズ群と前記第２レンズ群を光軸方向
に移動させて変倍を行うズームレンズにおいて、下記の
条件を満足することを特徴とするズームレンズ。(1) Three lens units, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit including at least one aspherical surface, are arranged in order from the object side. A zoom lens having a variable magnification by moving the first lens group and the second lens group in an optical axis direction, wherein the zoom lens satisfies the following condition.
【０００８】 ｜Ｐ3／ＰW｜＜０．０３・・・・・・・・・・・・・式［１］ ０．０５＜ＢW／ＬW＜０．２５・・・・・・・・・・式［２］ 但し、Ｐ3；第３レンズ群の屈折力ＰW；広角端における
全系の屈折力ＢW；広角端における第３レンズ群の像側
の面から結像面までの光軸方向の距離ＬW；広角端にお
けるレンズ全長 （２）前記第３レンズ群は１枚のレンズからなり、且つ
光軸方向にレンズ移動しないことを特徴とする前記
（１）に記載のズームレンズ。| P 3 / P W | <0.03 Equation [1] 0.05 <B W / L W <0.25... Formula [2] where, P 3 ; refractive power P W of the third lens group; refractive power B W of the entire system at the wide-angle end; optical axis direction of the distance L W to; lens length (2) the third lens group at the wide-angle end is made of one lens, and according to (1), characterized in that the optical axis direction without lens movement Zoom lens.
【０００９】（３）下記の条件を満足することを特徴と
する前記（１）に記載のズームレンズ。(3) The zoom lens according to the above (1), wherein the following condition is satisfied.
【００１０】 １．１＜ＰW／｜Ｐ1｜＜４．０・・・・・・・・・・式［３］ 但し、Ｐ1；第１レンズ群の屈折力 ＰW；広角端における全系の屈折力 （４）下記の条件を満足することを特徴とする前記
（１）、（２）または、（３）に記載のズームレンズ。1.1 <P W / | P 1 | <4.0 Expression (3) where P 1 ; refractive power P W of the first lens group; (4) The zoom lens according to (1), (2) or (3), which satisfies the following condition.
【００１１】 ０．１５＜（ｔ1＋ｔ2＋ｄ1t）／ＬT＜０．８０ ・・式［４］ 但し、ｔ1；第１レンズ群の長さ ｔ2；第２レンズ群の長さ ｄ1t；望遠端における第１レンズ群と第２レンズ群との
光軸方向の間隔 ＬT；望遠端におけるレンズ全長 （５）物体側より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、および、第３レンズ群の３つの
レンズ群を有し、前記第１レンズ群と前記第２レンズ群
を光軸方向に移動させて変倍を行うズームレンズにおい
て、前記第１レンズ群は物体側より順に物体側に凸面を
向けたメニスカス形状の負の屈折力を有するレンズ、お
よび、負の屈折力を有するプラスチックレンズと該プラ
スチックレンズに隣接する正の屈折力を有するプラスチ
ックレンズから成る２枚のプラスチックレンズを含み、
前記第２レンズ群は負の屈折力を有するプラスチックレ
ンズと正の屈折力を有するプラスチックレンズを接合し
た接合レンズ及び正の屈折力を有するレンズを含み、前
記第３レンズ群は少なくとも１枚の非球面レンズを含む
ことを特徴とするズームレンズ。0.15 <(t 1 + t 2 + d 1t ) / L T <0.80 Formula [4] where t 1 ; length of the first lens group t 2 ; length of the second lens group d 1t ; distance in the optical axis direction between the first lens unit and the second lens unit at the telephoto end L T ; total length of the lens at the telephoto end (5) The first lens unit having a negative refractive power and the positive refraction in order from the object side A zoom lens having three lens groups, a second lens group for power and a third lens group, and performing zooming by moving the first lens group and the second lens group in the optical axis direction; The first lens group has a meniscus lens having a negative refractive power with the convex surface facing the object side in order from the object side, and a plastic lens having a negative refractive power and a positive refractive power adjacent to the plastic lens. Two plastic lenses consisting of plastic lenses It includes,
The second lens group includes a cemented lens obtained by cementing a plastic lens having a negative refractive power and a plastic lens having a positive refractive power, and a lens having a positive refractive power. The third lens group includes at least one non-reflective lens. A zoom lens comprising a spherical lens.
【００１２】（６）前記第３レンズ群が１枚のプラスチ
ックレンズよりなることを特徴とする前記（５）に記載
のズームレンズ。(6) The zoom lens according to (5), wherein the third lens group comprises one plastic lens.
【００１３】（７）前記第３レンズ群は光軸方向にレン
ズ移動しないことを特徴とする前記（５）または前記
（６）に記載のズームレンズ。(7) The zoom lens according to (5) or (6), wherein the third lens group does not move in the optical axis direction.
【００１４】（８）下記の条件を満足することを特徴と
する前記（５）、（６）または（７）に記載のズームレ
ンズ。(8) The zoom lens according to (5), (6) or (7), wherein the following condition is satisfied.
【００１５】 １．１＜ＰW／｜Ｐ1｜＜４．０・・・・・・・・・・式［３］ 但し、Ｐ1；第１レンズ群の屈折力 ＰW；広角端の全系の屈折力 （９）下記の条件を満足することを特徴とする前記
（５）、（６）、（７）または（８）に記載のズームレ
ンズ。1.1 <P W / | P 1 | <4.0 (3) where P 1 ; refractive power P W of the first lens group; (9) The zoom lens according to (5), (6), (7) or (8), which satisfies the following condition.
【００１６】 ０．１５＜（ｔ1＋ｔ2＋ｄ1t）／ＬT＜０．８０ ・・式［４］ ０．０５＜ＢW／ＬW＜０．２５・・・・・・・・・・式［２］ 但し、ｔ1；第１レンズ群の長さ ｔ2；第２レンズ群の長さ ｄ1t；望遠端における前記第１レンズ群と前記第２レン
ズ群との間隔 ＢW；広角端における第３レンズ群の像側の面から結像
面までの距離 ＬW；広角端におけるレンズ全長 ＬT；望遠端におけるレンズ全長 （１０）下記の条件を満足することを特徴とする前記
（５）から（９）のいずれか１項に記載のズームレン
ズ。0.15 <(t 1 + t 2 + d 1t ) / L T <0.80 Equation [4] 0.05 <B W / L W <0.25... Formula (2), where t 1 ; length of the first lens group t 2 ; length of the second lens group d 1t ; distance B W between the first and second lens groups at the telephoto end; The distance L W from the image-side surface of the third lens group at the wide-angle end to the image forming surface L W ; the total length L T at the wide-angle end L T ; the total length of the lens at the telephoto end (10) The following condition is satisfied: The zoom lens according to any one of (5) to (9).
【００１７】 ０＜｜Ｐ1P／Ｐ1｜＜０．１２・・・・・・・・・・式［５］ ０＜｜Ｐ2P／Ｐ2｜＜０．０３・・・・・・・・・・式［６］ 但し、Ｐ1；第１レンズ群の屈折力 Ｐ1P；第１レンズ群の負の屈折力を持つプラスチックレ
ンズと正の屈折力を持つプラスチックレンズの合成屈折
力 Ｐ2；第２レンズ群の屈折力 Ｐ2P；第２レンズ群の負の屈折力を持つプラスチックレ
ンズと正の屈折力を持つプラスチックレンズを接合した
レンズの屈折力 （１１）物体側より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、および、第３レンズ群の３つ
のレンズ群を有し、前記第１レンズ群と第２レンズ群を
光軸方向に移動させて変倍を行うズームレンズにおい
て、前記第１レンズ群は物体側より順に２枚の負の屈折
力を持つレンズと正の屈折力を持つレンズの３枚から成
り、前記第２レンズ群は正の屈折力を持つレンズ２枚と
負の屈折力を持つレンズの３枚から成り、前記第３レン
ズ群は１枚のレンズから成ることを特徴とするズームレ
ンズ。0 <| P 1P / P 1 | <0.12... Formula (5) 0 <| P 2P / P 2 | <0.03. Formula [6] where P 1 : refractive power of the first lens group P 1P ; composite refractive power of a plastic lens having a negative refractive power and a plastic lens having a positive refractive power of the first lens group P 2 Refracting power of the second lens group P 2P ; refracting power of a lens in which the plastic lens having negative refractive power and the plastic lens having positive refractive power of the second lens group are joined (11) Negative refraction in order from the object side A first lens group having a positive power, a second lens group having a positive refractive power, and a third lens group. The first lens group and the second lens group are moved in the optical axis direction. In a zoom lens that performs zooming, the first lens group includes two lenses having negative refractive power in order from the object side. And the second lens group includes two lenses having a positive refractive power and three lenses having a negative refractive power, and the third lens group includes one lens having a positive refractive power. A zoom lens comprising a plurality of lenses.
【００１８】（１２）前記第３レンズ群は少なくとも１
面を非球面とし、且つ光軸方向にレンズ移動しないこと
を特徴とする前記（１１）に記載のズームレンズ。(12) The third lens group has at least one lens.
The zoom lens according to (11), wherein the surface is aspherical and the lens does not move in the optical axis direction.
【００１９】（１３）下記の条件を満足することを特徴
とする前記（１１）または（１２）に記載のズームレン
ズ。(13) The zoom lens according to (11) or (12), wherein the following condition is satisfied.
【００２０】 １．１＜ＰW／｜Ｐ1｜＜４．０・・・・・・・・・式［３］ 但し、Ｐ1；第１レンズ群の屈折力 ＰW；広角端における全系の屈折力 （１４）下記の条件を満足することを特徴とする前記
（１１）、（１２）または（１３）に記載のズームレン
ズ。1.1 <P W / | P 1 | <4.0 (3) where P 1 ; refractive power of the first lens unit P W ; (14) The zoom lens according to (11), (12) or (13), wherein the following condition is satisfied.
【００２１】 ０．１５＜（ｔ1＋ｔ2＋ｄ1t）／ＬT＜０．８０ ・・式［４］ ０．０５＜ＢW／ＬW＜０．２５・・・・・・・・・・式［２］ 但し、ｔ1；第１レンズ群の長さ ｔ2；第２レンズ群の長さ ｄ1t；望遠端における前記第１レンズ群と前記第２レン
ズ群との間隔 ＢW；広角端における第３レンズ群の像側の面から結像
面までの距離 ＬW；広角端におけるレンズ全長 ＬT；望遠端におけるレンズ全長 （１５）前記（１）から（１４）のいずれか１項に記載
のズームレンズを備えたことを特徴とするズームレンズ
付きカメラ。0.15 <(t 1 + t 2 + d 1t ) / L T <0.80 Formula [4] 0.05 <B W / L W <0.25... Formula (2), where t 1 ; length of the first lens group t 2 ; length of the second lens group d 1t ; distance B W between the first and second lens groups at the telephoto end; from the image-side surface of the third lens group at the wide-angle end distance L W to the imaging plane; total lens length L T at the wide-angle end; one lens length (15) at the telephoto end of (1) to (14) 1 A camera equipped with a zoom lens, comprising the zoom lens described in the above section.
【００２２】次に、上記の各条件式について説明する。
最初に、条件式［１］は第３レンズ群の屈折力を適切に
定めるものであり、条件式［１］の範囲を超え、第３レ
ンズ群の屈折力が正の屈折力を持つと、相対的に第２レ
ンズ群の屈折力が弱くなることによって、変倍時の第２
レンズ群の移動量が大きくなるために小型化が困難にな
る。また、第３レンズ群が負の屈折力を持つと、相対的
に第２レンズ群の正の屈折力が強くなることにより、変
倍時の球面収差の変動量が大きくなる。Next, each of the above conditional expressions will be described.
First, the conditional expression [1] appropriately determines the refractive power of the third lens group. If the refractive power of the third lens group exceeds the range of the conditional expression [1] and the refractive power of the third lens group has a positive refractive power, Since the refractive power of the second lens group becomes relatively weak, the second
Since the amount of movement of the lens group is large, miniaturization is difficult. When the third lens group has a negative refractive power, the positive refractive power of the second lens group becomes relatively strong, so that the amount of change in spherical aberration during zooming increases.
【００２３】また、条件式［２］を満足すると、広角端
において、球面収差やコマ収差などを悪化させることな
く、歪曲収差を補正することができる。条件式［２］の
上限を越えると、第３レンズ群の最終面から結像面まで
の距離が長くなることにより、歪曲収差の補正が困難に
なる。また、逆に条件式［２］の下限を越えると、広角
端でのレンズ全長が長くなり小型化が困難になる。ま
た、第３レンズ群の最終面から結像面までの距離が長く
なることにより、歪曲収差の補正が困難になる。また、
第３レンズ群の最終面から結像面までの距離が短くなり
過ぎると、光路分割などの光学素子が配置できない。好
ましくは０．０５＜ＢW／ＬW＜０．１５であり、広角端
におけるレンズ全長をより小さくすることができる。If conditional expression [2] is satisfied, distortion can be corrected at the wide-angle end without deteriorating spherical aberration, coma, and the like. If the upper limit of conditional expression [2] is exceeded, the distance from the final surface of the third lens group to the image forming surface will be long, making it difficult to correct distortion. On the other hand, if the lower limit of conditional expression [2] is exceeded, the overall length of the lens at the wide-angle end becomes longer, and miniaturization becomes difficult. In addition, since the distance from the final surface of the third lens group to the image forming surface becomes longer, it becomes difficult to correct distortion. Also,
If the distance from the final surface of the third lens group to the image plane is too short, optical elements such as optical path splitting cannot be arranged. Preferably, 0.05 <B W / L W <0.15, and the overall length of the lens at the wide-angle end can be further reduced.
【００２４】また、条件式［３］を満足すると、広角端
でのレンズ全長と広角端での歪曲収差をバランス良く補
正できる。条件式［３］の下限を越えると広角端でのレ
ンズ全長は短くなるが偏心等の像への影響が大きくなり
好ましくない。また条件式［３］の上限を越えると広角
端でのレンズ全長が長くなるとともに、変倍時の第１レ
ンズ群の移動量が大きくなってしまい小型化が困難にな
る。好ましくは１．１＜ＰW／｜Ｐ1｜＜３．２で、広角
端でのレンズ全長と広角端での歪曲収差をよりバランス
良く補正できる。If conditional expression [3] is satisfied, the total lens length at the wide-angle end and the distortion at the wide-angle end can be corrected in a well-balanced manner. If the lower limit of conditional expression [3] is exceeded, the overall length of the lens at the wide-angle end will be short, but the effect of decentering on the image will be undesirably large. If the upper limit of conditional expression [3] is exceeded, the total length of the lens at the wide-angle end becomes long, and the amount of movement of the first lens unit during zooming becomes large, making it difficult to reduce the size. Preferably, 1.1 <P W / | P 1 | <3.2, so that the total lens length at the wide-angle end and the distortion at the wide-angle end can be corrected with a better balance.
【００２５】また、条件式［４］を満足すると、カメラ
の携帯時に、第２レンズ群と第３レンズ群の間隔を短縮
してレンズを収納する場合、レンズ全長を短くすること
ができてカメラが小型となる。好ましくは０．３＜（ｔ
1＋ｔ2＋ｄ1t）／ＬT＜０．８０であり、カメラがより
小型となる。Further, when conditional expression [4] is satisfied, when the camera is carried and the lens is housed by shortening the distance between the second lens group and the third lens group, the overall length of the lens can be shortened. Becomes smaller. Preferably 0.3 <(t
1 + t 2 + d 1t) / L T < 0.80, the camera becomes more compact.
【００２６】さらに、条件式［５］と［６］とを共に満
足すると、プラスチックの温度変化による体積変化、屈
折率変化によっておこる結像性能の劣化を抑えることが
できる。この範囲を超えると、温度変化による体積変
化、屈折率変化によっておこる結像性能の劣化が大きく
なる。Further, when both conditional expressions [5] and [6] are satisfied, it is possible to suppress the deterioration of the imaging performance caused by the change in the volume and the change in the refractive index due to the temperature change of the plastic. Above this range, the deterioration of imaging performance caused by a change in volume and a change in refractive index due to a change in temperature becomes large.
【００２７】なお、第３レンズ群は正レンズであっても
負レンズであっても良い。The third lens group may be a positive lens or a negative lens.
【００２８】[0028]
【発明の実施の形態】本発明のズームレンズ、及び、ズ
ームレンズ付きカメラについて図面を参照して説明す
る。図７は撮影状態のズームレンズ付きカメラの斜視図
である。ズームレンズ付きカメラとしてデジタルカメラ
について説明するがこれに限定されるものではなく、例
えば、デジタルビデオカメラでもよい。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A zoom lens and a camera with a zoom lens according to the present invention will be described with reference to the drawings. FIG. 7 is a perspective view of a camera with a zoom lens in a shooting state. A digital camera will be described as a camera with a zoom lens, but is not limited thereto. For example, a digital video camera may be used.
【００２９】図７に示す如く、ズームレンズ付きカメラ
であるデジタルカメラ２０は固体撮像素子としてＣＣＤ
を用いたカメラである。また、デジタルカメラ２０は正
面中央に撮影レンズＬがあり、正面上部にはファインダ
２１がある。また、カメラの上面左側にレリーズボタン
２２と鏡胴部２４を繰り出す釦２５があり、上面右側に
ストロボ窓２３がある。前記撮影レンズＬは後述する
［実施例］に記載のズームレンズである。鏡胴部２４は
沈胴式となっており、撮影時には繰り出され、携帯時に
は沈胴する。As shown in FIG. 7, a digital camera 20, which is a camera with a zoom lens, has a CCD as a solid-state image sensor.
This is a camera using. The digital camera 20 has a photographic lens L at the front center and a finder 21 at the upper front. A release button 22 and a button 25 for extending the lens barrel 24 are provided on the upper left side of the camera, and a strobe window 23 is provided on the upper right side. The photographing lens L is a zoom lens described in [Example] described later. The lens barrel 24 is of a retractable type, which is extended when photographing and retracted when carried.
【００３０】以上により、デジタルカメラ２０は、歪曲
収差を十分に補正でき、変倍比が３倍程度の小型のズー
ムレンズを組み込んでいるために小型となる。As described above, the digital camera 20 can sufficiently correct the distortion, and has a small size because of incorporating a small zoom lens having a zoom ratio of about 3 times.
【００３１】[0031]
【実施例】次に、本発明にかかわるズームレンズの実施
例を示す。なお、実施例で使用する記号は下記の通りで
ある。Next, an embodiment of a zoom lens according to the present invention will be described. The symbols used in the examples are as follows.
【００３２】ｆ；焦点距離 ω；半画角 Ｆno；Ｆナンバー Ｒi；物体側より順に第ｉ番目のレンズ面の曲率半径 Ｄi；物体側より順に第ｉ番目のレンズ厚さ、および、
空気間隔 ｎdi；物体側より順に第ｉ番目のレンズのｄ線でのガラ
スの屈折率 νdi；物体側より順に第ｉ番目のレンズのｄ線でのガラ
スのアッベ数 実施例の非球面形状を以下の「数１」に表す。F; focal length ω; half angle of view F no ; F number R i ; radius of curvature of the i-th lens surface in order from the object side Di ; i-th lens thickness in order from the object side, and
Air spacing n di ; refractive index of glass at d-line of i-th lens in order from object side v di ; Abbe number of glass at d-line of i-th lens in order from object side Aspherical shape of the embodiment Is represented by the following “Formula 1”.
【００３３】[0033]
【数１】 (Equation 1)
【００３４】なお、光軸方向をｘ軸、光軸と垂直方向を
ｈ軸、Ｒは近軸曲率半径、Ｋは円錐係数、Ａ4、Ａ6、Ａ
8、Ａ10はそれぞれ非球面係数を示す。The optical axis direction is the x-axis, the direction perpendicular to the optical axis is the h-axis, R is the paraxial radius of curvature, K is the conic coefficient, A 4 , A 6 , A
8, A 10 represents an aspherical coefficient, respectively.
【００３５】各実施例において、図中のＬＧ１は第１レ
ンズ群、ＬＧ２は第２レンズ群、ＬＧ３は第３レンズ群
をそれぞれ示す。また、レンズ光学系の結像面近傍の３
枚の平行ガラスは物体側から順に赤外カットフィルタ、
ローパスフィルタ、ＣＣＤカバーガラスをそれぞれ示
す。また、各実施例では第３レンズ群を光軸方向にレン
ズ移動しない固定としたが、レンズ移動としても良い。In each embodiment, LG1 in the figures denotes a first lens group, LG2 denotes a second lens group, and LG3 denotes a third lens group. Further, 3 near the image plane of the lens optical system.
The sheets of parallel glass are infrared cut filters in order from the object side,
A low-pass filter and a CCD cover glass are shown. In each embodiment, the third lens group is fixed so as not to move the lens in the optical axis direction.
【００３６】（実施例１）請求項１から１４にかかわる
実施例について説明する。実施例１の短焦点端における
レンズ断面図と変倍時の各レンズ群の移動軌跡を図１に
示す。また、レンズデータを表１、表２に示す。(Embodiment 1) An embodiment according to claims 1 to 14 will be described. FIG. 1 shows a lens cross-sectional view at the short focal length end of Example 1 and the movement locus of each lens group during zooming. Tables 1 and 2 show lens data.
【００３７】[0037]
【表１】 [Table 1]
【００３８】[0038]
【表２】 [Table 2]
【００３９】プラスチックレンズは物体側から第２レン
ズ（曲率半径Ｒ３、Ｒ４のレンズ）、第３レンズ（曲率
半径Ｒ４、Ｒ５のレンズ）、第５レンズ（曲率半径Ｒ
９、Ｒ１０のレンズ）、第６レンズ（曲率半径Ｒ１０、
Ｒ１１のレンズ）及び第７レンズ（曲率半径Ｒ１２、Ｒ
１３のレンズ）である。また、実施例１の広角端、中間
望遠端でのレンズ収差図を図２の（Ａ）広角端（Ｂ）中
間（Ｃ）望遠端に示す。レンズ収差はいずれも良好に補
正されている。From the object side, the plastic lens includes a second lens (a lens having a radius of curvature R3 and R4), a third lens (a lens having a radius of curvature R4 and R5), and a fifth lens (a lens having a radius of curvature R).
9, R10), sixth lens (radius of curvature R10,
R11) and a seventh lens (radius of curvature R12, R
13 lenses). Further, lens aberration diagrams at the wide-angle end and an intermediate telephoto end of the first embodiment are shown at (A) wide-angle end (B) and intermediate (C) telephoto end in FIG. All lens aberrations are well corrected.
【００４０】（実施例２）請求項１から４，１１から１
４にかかわる実施例について説明する。実施例２の短焦
点端におけるレンズ断面図と変倍時の各レンズ群の移動
軌跡を図３に示す。また、レンズデータを表３、表４に
示す。(Embodiment 2) Claims 1 to 4, 11 to 1
Fourth embodiment will be described. FIG. 3 shows a lens cross-sectional view at the short focal length end of Example 2 and the movement locus of each lens unit during zooming. Tables 3 and 4 show lens data.
【００４１】[0041]
【表３】 [Table 3]
【００４２】[0042]
【表４】 [Table 4]
【００４３】プラスチックレンズは物体側から第５レン
ズ、第６レンズ及び第７レンズである。また、実施例２
の広角端、中間望遠端でのレンズ収差図を図４の（Ａ）
広角端（Ｂ）中間（Ｃ）望遠端に示す。レンズ収差はい
ずれも良好に補正されている。The plastic lenses are a fifth lens, a sixth lens and a seventh lens from the object side. Example 2
FIG. 4A is a lens aberration diagram at the wide-angle end and the intermediate telephoto end of FIG.
It is shown at the wide-angle end (B), at the middle (C), and at the telephoto end. All lens aberrations are well corrected.
【００４４】（実施例３）請求項１から１４にかかわる
実施例について説明する。実施例３の短焦点端における
レンズ断面図と変倍時の各レンズ群の移動軌跡を図５に
示す。また、レンズデータを表５、表６に示す。(Embodiment 3) An embodiment according to claims 1 to 14 will be described. FIG. 5 shows a lens cross-sectional view at the short focal length end of Example 3 and the movement locus of each lens unit during zooming. Tables 5 and 6 show lens data.
【００４５】[0045]
【表５】 [Table 5]
【００４６】[0046]
【表６】 [Table 6]
【００４７】プラスチックレンズは物体側から第２レン
ズ、第３レンズ、第５レンズ、第６レンズ及び第７レン
ズである。また、実施例３の広角端、中間望遠端でのレ
ンズ収差図を図６の（Ａ）広角端（Ｂ）中間（Ｃ）望遠
端に示す。レンズ収差はいずれも良好に補正されてい
る。The plastic lenses are a second lens, a third lens, a fifth lens, a sixth lens and a seventh lens from the object side. In addition, lens aberration diagrams at the wide-angle end and an intermediate telephoto end according to the third embodiment are shown in FIG. 6A at the wide-angle end, (B) at the intermediate (C) telephoto end. All lens aberrations are well corrected.
【００４８】次に、実施例１から３の条件式の数値を表
７に示す。Next, Table 7 shows numerical values of the conditional expressions of Examples 1 to 3.
【００４９】[0049]
【表７】 [Table 7]
【００５０】表７に示す如く、いずれも条件式を満足し
ている。As shown in Table 7, all satisfy the conditional expressions.
【００５１】[0051]
【発明の効果】以上のように構成したので、下記のよう
な効果を奏する。請求項１から請求項１４に記載のズー
ムレンズによれば、歪曲収差が十分に補正でき前玉径の
小さいズームレンズとなった。特に、高画素数のデジタ
ルカメラ等に最適な変倍比３倍程度のコンパクトなズー
ムレンズとなった。According to the structure described above, the following effects can be obtained. According to the zoom lens described in any one of the first to fourteenth aspects, a zoom lens having a small front lens diameter can sufficiently correct distortion. In particular, a compact zoom lens with a zoom ratio of about three times, which is optimal for a digital camera with a large number of pixels and the like, was obtained.
【００５２】さらに詳しくは、請求項１に記載の発明に
よれば、変倍時の第２レンズ群の移動量が小さく小型化
でき、変倍時の球面収差の変動量も小さい。また、広角
端におけるレンズ全長を小さくすることができた。More specifically, according to the first aspect of the present invention, the amount of movement of the second lens unit at the time of zooming can be small, and the size can be reduced, and the amount of variation of spherical aberration at the time of zooming can be small. Also, the overall length of the lens at the wide-angle end could be reduced.
【００５３】請求項２に記載の発明によれば、広角端に
おいて第１レンズ群、第２レンズ群で発生する歪曲収差
を補正することができた。According to the second aspect of the invention, it is possible to correct the distortion occurring in the first lens unit and the second lens unit at the wide angle end.
【００５４】請求項３に記載の発明によれば、広角端で
のレンズ全長と広角端での歪曲収差をバランス良く補正
できた。According to the third aspect of the invention, the total lens length at the wide-angle end and the distortion at the wide-angle end can be corrected with good balance.
【００５５】請求項４に記載の発明によれば、カメラの
携帯時に、第２レンズ群と第３レンズ群の間隔を短縮し
て、レンズを収納するようにした時、レンズ全長を短く
することができ、カメラの小型化が可能となった。According to the fourth aspect of the present invention, when the camera is carried, the distance between the second lens group and the third lens group is reduced to accommodate the lens, and the overall length of the lens is reduced. And the size of the camera can be reduced.
【００５６】請求項５に記載の発明によれば、倍率色収
差、および、歪曲収差を良好に補正するとともに、プラ
スチックの欠点である温度変化による像への影響を小さ
くすることができ、負の屈折力と正の屈折力を持つプラ
スチックレンズを接合することによってレンズ組立ての
際に発生する偏心の像への影響を抑えことができた。According to the fifth aspect of the invention, it is possible to satisfactorily correct lateral chromatic aberration and distortion, and to reduce the influence of a temperature change, which is a disadvantage of plastic, on an image. By joining the lens with a plastic lens having a positive refractive power, the influence of the eccentricity generated at the time of assembling the lens on the image could be suppressed.
【００５７】請求項６に記載の発明によれば、全体とし
てプラスチックレンズを多く使用し、レンズ枚数を少な
くすることで軽量、且つ、安価なズームレンズとするこ
とができた。According to the sixth aspect of the present invention, a lightweight and inexpensive zoom lens can be obtained by using many plastic lenses as a whole and reducing the number of lenses.
【００５８】請求項７に記載の発明によれば、広角端に
おいて第１レンズ群、第２レンズ群で発生する歪曲収差
を補正することができた。According to the seventh aspect of the invention, it is possible to correct the distortion generated in the first lens unit and the second lens unit at the wide angle end.
【００５９】請求項８に記載の発明によれば、広角端で
のレンズ全長と広角端での歪曲収差をバランス良く補正
できた。According to the eighth aspect of the invention, the total lens length at the wide-angle end and the distortion at the wide-angle end can be corrected with good balance.
【００６０】請求項９に記載の発明によれば、広角端に
おけるレンズ全長を小さくすることができ、望遠端での
レンズ全長を小さくすることができた。According to the ninth aspect of the present invention, the overall length of the lens at the wide-angle end can be reduced, and the overall length of the lens at the telephoto end can be reduced.
【００６１】請求項１０に記載の発明によれば、プラス
チックの温度変化による体積変化、屈折率変化によって
おこる結像性能の劣化を抑えることができた。According to the tenth aspect, it is possible to suppress the deterioration of the imaging performance caused by the change in volume and the change in the refractive index of the plastic due to the change in temperature.
【００６２】請求項１１に記載の発明によれば、色収差
の補正を行うとともに、コンパクトな３群ズームレンズ
にすることができた。According to the eleventh aspect, chromatic aberration can be corrected and a compact three-unit zoom lens can be obtained.
【００６３】請求項１２に記載の発明によれば、広角端
において第１レンズ群、第２レンズ群で発生する歪曲収
差を補正することができた。According to the twelfth aspect of the invention, it is possible to correct the distortion generated in the first lens unit and the second lens unit at the wide angle end.
【００６４】請求項１３に記載の発明によれば、広角端
でのレンズ全長と広角端での歪曲収差をバランス良く補
正できた。According to the thirteenth aspect, the total lens length at the wide-angle end and the distortion at the wide-angle end can be corrected with good balance.
【００６５】請求項１４に記載の発明によれば、広角端
におけるレンズ全長を小さくすることができ、望遠端で
のレンズ全長を小さくすることができた。According to the fourteenth aspect, the total lens length at the wide-angle end can be reduced, and the total lens length at the telephoto end can be reduced.
【００６６】更に、請求項１５に記載の発明によれば、
歪曲収差が十分に補正でき、前玉径の小さいズームレン
ズを有するズームレンズ付きカメラとなった。特に、変
倍比３倍程度のズームレンズを有するコンパクトなズー
ムレンズ付きカメラとなった。Further, according to the invention of claim 15,
Distortion can be sufficiently corrected, and a camera with a zoom lens having a zoom lens with a small front lens diameter is obtained. In particular, a compact camera with a zoom lens having a zoom lens with a zoom ratio of about three times was obtained.
【図１】実施例１の短焦点端におけるレンズ断面図と変
倍時の各レンズ群の移動軌跡である。FIG. 1 is a sectional view of a lens at a short focal length end of Example 1 and a movement locus of each lens group during zooming.
【図２】実施例１の（Ａ）広角端（Ｂ）中間（Ｃ）望遠
端でのレンズ収差図である。FIGS. 2A and 2B are lens aberration diagrams of Example 1 at (A) a wide-angle end, (B) at an intermediate position (C), and at a telephoto end.
【図３】実施例２の短焦点端におけるレンズ断面図と変
倍時の各レンズ群の移動軌跡である。FIG. 3 is a sectional view of a lens at a short focal length end of Example 2 and a movement locus of each lens unit during zooming.
【図４】実施例２の（Ａ）広角端（Ｂ）中間（Ｃ）望遠
端でのレンズ収差図である。FIG. 4 is a lens aberration diagram at a wide-angle end (B), at a middle (C), and at a telephoto end in Example 2;
【図５】実施例３の短焦点端におけるレンズ断面図と変
倍時の各レンズ群の移動軌跡である。5A and 5B are a sectional view of a lens at a short focal length end of Example 3 and a movement locus of each lens unit during zooming.
【図６】実施例３の（Ａ）広角端（Ｂ）中間（Ｃ）望遠
端でのレンズ収差図である。6A and 6B are lens aberration diagrams at the wide-angle end (B), at the middle (C), and at the telephoto end in Example 3;
【図７】撮影状態のズームレンズ付きカメラの斜視図で
ある。FIG. 7 is a perspective view of a camera with a zoom lens in a shooting state.
２０ デジタルカメラ Ｌ 撮影レンズ ＬＧ１ 第１レンズ群 ＬＧ２ 第２レンズ群 ＬＧ３ 第３レンズ群 20 Digital camera L Photographing lens LG1 First lens group LG2 Second lens group LG3 Third lens group
Claims (15)
群、正の屈折力の第２レンズ群、および、少なくとも１
枚の非球面を含む第３レンズ群の３つのレンズ群を有
し、前記第１レンズ群と前記第２レンズ群を光軸方向に
移動させて変倍を行うズームレンズにおいて、下記の条
件を満足することを特徴とするズームレンズ。 ｜Ｐ3／ＰW｜＜０．０３ ０．０５＜ＢW／ＬW＜０．２５ 但し、Ｐ3；第３レンズ群の屈折力 ＰW；広角端における全系の屈折力 ＢW；広角端における第３レンズ群の像側の面から結像
面までの光軸方向の距離 ＬW；広角端におけるレンズ全長1. A first lens group having a negative refractive power, a second lens group having a positive refractive power, and at least one
In a zoom lens having three lens groups including a third aspherical surface and performing zooming by moving the first lens group and the second lens group in the optical axis direction, the following condition is satisfied. A zoom lens characterized by satisfaction. | P 3 / P W | <0.03 0.05 <B W / L W <0.25 where P 3 ; refractive power of the third lens group P W ; refractive power of the whole system at the wide-angle end B W ; Distance in the optical axis direction from the image-side surface of the third lens unit to the image forming surface at the wide-angle end L W ; overall length of the lens at the wide-angle end
り、且つ光軸方向にレンズ移動しないことを特徴とする
請求項１に記載のズームレンズ。2. The zoom lens according to claim 1, wherein the third lens group includes a single lens and does not move in the optical axis direction.
請求項１に記載のズームレンズ。 １．１＜ＰW／｜Ｐ1｜＜４．０ 但し、Ｐ1；第１レンズ群の屈折力 ＰW；広角端における全系の屈折力3. The zoom lens according to claim 1, wherein the following condition is satisfied. 1.1 <P W / | P 1 | <4.0 where P 1 ; refractive power of the first lens group P W ; refractive power of the entire system at the wide-angle end
請求項１、２または、３に記載のズームレンズ。 ０．１５＜（ｔ1＋ｔ2＋ｄ1t）／ＬT＜０．８０ 但し、ｔ1；第１レンズ群の長さ ｔ2；第２レンズ群の長さ ｄ1t；望遠端における第１レンズ群と第２レンズ群との
光軸方向の間隔 ＬT；望遠端におけるレンズ全長4. The zoom lens according to claim 1, wherein the following condition is satisfied. 0.15 <(t 1 + t 2 + d 1t) / L T <0.80 where, t 1; first lens at the telephoto end; length d 1t of the second lens group; length t 2 of the first lens group The distance L T between the lens unit and the second lens unit in the optical axis direction; total lens length at the telephoto end
群、正の屈折力の第２レンズ群、および、第３レンズ群
の３つのレンズ群を有し、前記第１レンズ群と前記第２
レンズ群を光軸方向に移動させて変倍を行うズームレン
ズにおいて、前記第１レンズ群は物体側より順に物体側
に凸面を向けたメニスカス形状の負の屈折力を有するレ
ンズ、および、負の屈折力を有するプラスチックレンズ
と該プラスチックレンズに隣接する正の屈折力を有する
プラスチックレンズから成る２枚のプラスチックレンズ
を含み、前記第２レンズ群は負の屈折力を有するプラス
チックレンズと正の屈折力を有するプラスチックレンズ
を接合した接合レンズ及び正の屈折力を有するレンズを
含み、前記第３レンズ群は少なくとも１枚の非球面レン
ズを含むことを特徴とするズームレンズ。5. There are three lens groups, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group, in that order from the object side. The second
In a zoom lens that performs zooming by moving a lens group in the optical axis direction, the first lens group has a meniscus-shaped lens having a negative refractive power with a convex surface facing the object side in order from the object side, and a negative lens. The second lens group includes a plastic lens having a negative refractive power and a plastic lens having a negative refractive power, the plastic lens having a refractive power and a plastic lens having a positive refractive power adjacent to the plastic lens. And a third lens group including at least one aspherical lens, wherein the third lens group includes at least one aspherical lens.
レンズよりなることを特徴とする請求項５に記載のズー
ムレンズ。6. The zoom lens according to claim 5, wherein said third lens group comprises one plastic lens.
動しないことを特徴とする請求項５または６に記載のズ
ームレンズ。7. The zoom lens according to claim 5, wherein the third lens group does not move in the optical axis direction.
請求項５、６または７に記載のズームレンズ。 １．１＜ＰW／｜Ｐ1｜＜４．０ 但し、Ｐ1；第１レンズ群の屈折力 ＰW；広角端の全系の屈折力8. The zoom lens according to claim 5, wherein the following condition is satisfied. 1.1 <P W / | P 1 | <4.0, where P 1 ; refractive power of the first lens unit P W ; refractive power of the entire system at the wide-angle end
請求項５、６、７または８に記載のズームレンズ。 ０．１５＜（ｔ1＋ｔ2＋ｄ1t）／ＬT＜０．８０ ０．０５＜ＢW／ＬW＜０．２５ 但し、ｔ1；第１レンズ群の長さ ｔ2；第２レンズ群の長さ ｄ1t；望遠端における前記第１レンズ群と前記第２レン
ズ群との間隔 ＢW；広角端における第３レンズ群の像側の面から結像
面までの距離 ＬW；広角端におけるレンズ全長 ＬT；望遠端におけるレンズ全長9. The zoom lens according to claim 5, wherein the following condition is satisfied. 0.15 <(t 1 + t 2 + d 1t) / L T <0.80 0.05 <B W / L W <0.25 where, t 1; the length of the first lens group t 2; the second lens Group length d 1t ; Distance between the first lens group and the second lens group at the telephoto end B W ; Distance from the image side surface of the third lens group at the wide angle end to the imaging plane L W ; Total lens length at the end L T ; Total lens length at the telephoto end
る請求項５から９のいずれか１項に記載のズームレン
ズ。 ０＜｜Ｐ1P／Ｐ1｜＜０．１２ ０＜｜Ｐ2P／Ｐ2｜＜０．０３ 但し、Ｐ1；第１レンズ群の屈折力 Ｐ1P；第１レンズ群の負の屈折力を持つプラスチックレ
ンズと正の屈折力を持つプラスチックレンズの合成屈折
力 Ｐ2；第２レンズ群の屈折力 Ｐ2P；第２レンズ群の負の屈折力を持つプラスチックレ
ンズと正の屈折力を持つプラスチックレンズを接合した
レンズの屈折力10. The zoom lens according to claim 5, wherein the following condition is satisfied. 0 <| P 1P / P 1 | <0.12 0 <| P 2P / P 2 | <0.03, where P 1 : refractive power of the first lens group P 1P ; negative refractive power of the first lens group The composite refractive power of a plastic lens having a positive refractive power and a plastic lens having a positive refractive power P 2 ; the refractive power of the second lens group P 2P ; the plastic lens having a negative refractive power of the second lens group and having a positive refractive power Refractive power of lens with plastic lens
ズ群、正の屈折力の第２レンズ群、および、第３レンズ
群の３つのレンズ群を有し、前記第１レンズ群と第２レ
ンズ群を光軸方向に移動させて変倍を行うズームレンズ
において、前記第１レンズ群は物体側より順に２枚の負
の屈折力を持つレンズと正の屈折力を持つレンズの３枚
から成り、前記第２レンズ群は正の屈折力を持つレンズ
２枚と負の屈折力を持つレンズの３枚から成り、前記第
３レンズ群は１枚のレンズから成ることを特徴とするズ
ームレンズ。11. A lens system comprising, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group. In the zoom lens which performs zooming by moving the second lens group in the optical axis direction, the first lens group is composed of two lenses having a negative refractive power and a lens having a positive refractive power in order from the object side. The second lens group is composed of two lenses having positive refractive power and three lenses having negative refractive power, and the third lens group is composed of one lens. Zoom lens.
非球面とし、且つ光軸方向にレンズ移動しないことを特
徴とする請求項１１に記載のズームレンズ。12. The zoom lens according to claim 11, wherein the third lens group has at least one aspheric surface and does not move in the optical axis direction.
る請求項１１または１２に記載のズームレンズ。 １．１＜ＰW／｜Ｐ1｜＜４．０ 但し、Ｐ1；第１レンズ群の屈折力 ＰW；広角端における全系の屈折力13. The zoom lens according to claim 11, wherein the following condition is satisfied. 1.1 <P W / | P 1 | <4.0 where P 1 ; refractive power of the first lens group P W ; refractive power of the entire system at the wide-angle end
る請求項１１、１２または１３に記載のズームレンズ。 ０．１５＜（ｔ1＋ｔ2＋ｄ1t）／ＬT＜０．８０ ０．０５＜ＢW／ＬW＜０．２５ 但し、ｔ1；第１レンズ群の長さ ｔ2；第２レンズ群の長さ ｄ1t；望遠端における前記第１レンズ群と前記第２レン
ズ群との間隔 ＢW；広角端における第３レンズ群の像側の面から結像
面までの距離 ＬW；広角端におけるレンズ全長 ＬT；望遠端におけるレンズ全長14. The zoom lens according to claim 11, wherein the following condition is satisfied. 0.15 <(t 1 + t 2 + d 1t) / L T <0.80 0.05 <B W / L W <0.25 where, t 1; the length of the first lens group t 2; the second lens Group length d 1t ; Distance between the first lens group and the second lens group at the telephoto end B W ; Distance from the image side surface of the third lens group at the wide angle end to the imaging plane L W ; Total lens length at the end L T ; Total lens length at the telephoto end
項に記載のズームレンズを備えたことを特徴とするズー
ムレンズ付きカメラ。15. The method according to claim 1, wherein:
A camera equipped with a zoom lens, comprising the zoom lens described in the paragraph.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20174199A JP4411693B2 (en) | 1999-07-15 | 1999-07-15 | Zoom lens and camera with zoom lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20174199A JP4411693B2 (en) | 1999-07-15 | 1999-07-15 | Zoom lens and camera with zoom lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001033701A true JP2001033701A (en) | 2001-02-09 |
| JP4411693B2 JP4411693B2 (en) | 2010-02-10 |
Family
ID=16446179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20174199A Expired - Fee Related JP4411693B2 (en) | 1999-07-15 | 1999-07-15 | Zoom lens and camera with zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4411693B2 (en) |
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