JP2000081571A - Step zoom lens - Google Patents
Step zoom lensInfo
- Publication number
- JP2000081571A JP2000081571A JP11179408A JP17940899A JP2000081571A JP 2000081571 A JP2000081571 A JP 2000081571A JP 11179408 A JP11179408 A JP 11179408A JP 17940899 A JP17940899 A JP 17940899A JP 2000081571 A JP2000081571 A JP 2000081571A
- Authority
- JP
- Japan
- Prior art keywords
- lens group
- zooming
- lens
- focal length
- stop
- 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.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lenses (AREA)
- Lens Barrels (AREA)
Abstract
Description
【０００１】[0001]
【技術分野】本発明は、デジタルカメラ、ビデオカメラ
及びコンパクトカメラのズームレンズに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to zoom lenses for digital cameras, video cameras, and compact cameras.
【０００２】[0002]
【従来技術及びその問題点】ズームレンズにおいては一
般に、可動変倍レンズ群を無段階に移動させることによ
り焦点距離をステップレスに変化させることができる。
撮影レンズ系による物体像をそのままファインダ視する
一眼レフカメラでは、可動変倍レンズ群を任意位置に停
止させることができることが望ましい。レンズ系の焦点
距離を電気的に検出して何らかの制御に利用しているよ
うな一眼レフカメラにおいて、不連続なズーミング動作
でファインダ像を不自然にしないように、機械的には可
動変倍レンズ群を任意の焦点距離位置に停止させること
ができるとしても、検出される焦点距離の値は実用上問
題のない程度のステップワイズで検出され、何らかの制
御に利用されていることがある。すなわち、焦点距離の
検出がステップワイズであることと、可動変倍レンズ群
自体が任意の位置で停止できることとは意味が異なる。2. Description of the Related Art In general, in a zoom lens, the focal length can be changed steplessly by moving a movable variable power lens group steplessly.
In a single-lens reflex camera in which an object image by a photographing lens system is viewed through a finder as it is, it is desirable that the movable variable magnification lens group can be stopped at an arbitrary position. In single-lens reflex cameras, where the focal length of the lens system is electrically detected and used for some kind of control, a mechanical zoom lens is used to prevent the viewfinder image from becoming unnatural due to discontinuous zooming. Even if the group can be stopped at an arbitrary focal length position, the value of the detected focal length may be detected stepwise so as to cause no practical problem and used for some control. That is, there is a difference between the fact that the detection of the focal length is stepwise and that the movable variable power lens group itself can be stopped at an arbitrary position.
【０００３】一方、撮影光学系による像とは別の像をフ
ァインダ光学系で観察するデジタルカメラ、ビデオカメ
ラ及びコンパクトカメラでは、可動変倍レンズ群をステ
ップレスに停止させるメリットは少なく、焦点距離検出
をステップワイズにするのと合わせて、可動変倍レンズ
群をステップワイズに停止させることが行なわれてい
る。On the other hand, in a digital camera, a video camera, and a compact camera in which an image different from an image obtained by a photographing optical system is observed by a viewfinder optical system, there is little merit of stopping a movable variable-magnification lens unit steplessly, and a focal length is detected. In addition to the stepwise setting, the movable variable magnification lens group is stopped stepwise.
【０００４】[0004]
【発明の目的】本発明は、特定のズーミング基礎軌跡を
持つズームレンズにこのステップズームレンズを適用す
るに際し、小型化を図り、かつ絞り周辺のスペースを確
保することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to reduce the size and secure a space around an aperture when applying this step zoom lens to a zoom lens having a specific zooming basic locus.
【０００５】[0005]
【発明の概要】本発明は、物体側から順に、負の屈折力
の可動の第１レンズ群と、ズーミングに際してその位置
が固定の絞りと、正の屈折力の可動の第２レンズ群とを
有するズームレンズであって、そのステップズームの基
礎となるズーミング基礎軌跡、つまり像位置を変化させ
ずに焦点距離を変化させる第１レンズ群のズーミング基
礎軌跡が、広角端から望遠端へのズーミング時に、絞り
との距離を縮小した後、再び絞りとの距離を拡大し、同
第２レンズ群のズーミング基礎軌跡が、絞りとの距離を
単調に変化させるズームレンズにおいて、第１レンズ群
と第２レンズ群を、ズーミング基礎軌跡上で間隔をおい
て停止させるステップズームとし、かつ、ズーミング基
礎軌跡上で第１レンズ群と絞りの間隔が最小となる焦点
距離及びその近傍を停止焦点距離ステップから外し、停
止させないようにしたことを特徴としている。SUMMARY OF THE INVENTION The present invention comprises, in order from the object side, a movable first lens unit having a negative refractive power, a stop whose position is fixed during zooming, and a movable second lens unit having a positive refractive power. A zoom lens having a zooming basic locus that is the basis of the step zoom, that is, a zooming basic locus of the first lens group that changes the focal length without changing the image position, when zooming from the wide-angle end to the telephoto end. After reducing the distance to the stop, the distance to the stop is increased again, and the zooming basic trajectory of the second lens group is changed to a monotonous change in the distance to the stop. A step zoom in which the lens group is stopped at intervals on the basic zooming locus, and a focal length at or near the focal length where the distance between the first lens group and the aperture is minimum on the basic zooming locus. Remove from the stop focal length step, is characterized in that so as not to stop.
【０００６】第１レンズ群の停止焦点距離ステップは、
第１レンズ群と絞りとの間隔が最小となるズーミング基
礎軌跡の頂点の前後に少なくとも１つずつ以上を設ける
のが実際的である。さらに、この頂点の前後の第１レン
ズ群の停止位置は、同一位置とすれば、この２つの焦点
距離ステップでは、第１レンズ群を移動させる必要がな
い。The stop focal length step of the first lens group is:
It is practical that at least one or more is provided before and after the vertex of the zooming basic locus at which the distance between the first lens group and the aperture is minimum. Furthermore, if the stop positions of the first lens group before and after this vertex are the same position, there is no need to move the first lens group in these two focal length steps.
【０００７】本発明は、第１レンズ群と第２レンズ群の
他に、ズーミングに際してその位置が固定の第３レンズ
群を有するタイプのズームレンズにも適用できる。The present invention is applicable to a zoom lens of a type having a third lens group whose position is fixed during zooming, in addition to the first lens group and the second lens group.
【０００８】焦点距離ステップは、ズーミング時に第２
レンズ群の移動量が等ピッチになるように設定し、ある
いは第２レンズ群の移動量が該第２レンズ群の最小移動
量の整数倍になるように設定することができる。[0008] The focal length step is a second step during zooming.
The amount of movement of the lens groups can be set to be equal in pitch, or the amount of movement of the second lens group can be set to be an integral multiple of the minimum amount of movement of the second lens group.
【０００９】[0009]
【発明の実施の形態】図１は、本発明によるステップズ
ームレンズの第一の実施形態を示している。表１、表２
は、そのレンズデータである。このレンズ系は、物体側
から順に、負のパワーの第１レンズ群１１、絞り１２、
正のパワーの第２レンズ群１３を備え、ズーミング中、
第１レンズ群１１と第２レンズ群１３は可動であり、絞
り１２はズーミング中その位置が固定である。像面（Ｃ
ＣＤ）の前には、フィルタ等の平行平面板１４が配置さ
れている。表１中のＲは曲率半径、Ｄはレンズ厚または
レンズ間隔、Ｎd はｄ線の屈折率、νｄはアッベ数を示
す。FIG. 1 shows a first embodiment of a step zoom lens according to the present invention. Table 1, Table 2
Is the lens data. This lens system includes, in order from the object side, a first lens unit 11 having a negative power, an aperture 12,
A second lens group 13 having a positive power is provided, and during zooming,
The first lens group 11 and the second lens group 13 are movable, and the position of the diaphragm 12 is fixed during zooming. Image plane (C
In front of CD), a parallel flat plate 14 such as a filter is arranged. In Table 1, R represents a radius of curvature, D represents a lens thickness or a lens interval, N d represents a refractive index of a d-line, and νd represents an Abbe number.
【００１０】ステップズームを実現する上での第１レン
ズ群１１と第２レンズ群１３のズーミング基礎軌跡、つ
まり像位置を変化させずに焦点距離を変化させるための
第１レンズ群１１と第２レンズ群１３の基礎軌跡は、図
１の下方に示すように、第１レンズ群１１については、
広角端から望遠端へのズーミング時に、絞り１２との距
離を縮小した後、再び拡大させる軌跡である。つまり、
第１レンズ群１１のズーミング基礎軌跡は、頂点におい
て最も絞り１２に接近し、頂点の前後で絞り１２から離
間する。これに対し、第２レンズ群１３の基礎軌跡は、
絞り１２との距離を単調に縮小させる軌跡である。「基
礎」軌跡と称する所以は、第１レンズ群１１と第２レン
ズ群１３は常時この軌跡上を移動するわけではなく、ス
テップワイズに停止させるときの停止位置を定めるため
に利用されるからである。The first lens group 11 and the second lens group 11 for changing the focal length without changing the image position, ie, the basic locus of zooming of the first lens group 11 and the second lens group 13 for realizing the step zoom. The basic trajectory of the lens group 13 is, as shown in the lower part of FIG.
At the time of zooming from the wide-angle end to the telephoto end, this is a trajectory that reduces the distance to the diaphragm 12 and then expands again. That is,
The basic zooming locus of the first lens group 11 is closest to the stop 12 at the vertex, and is separated from the stop 12 before and after the vertex. On the other hand, the basic locus of the second lens group 13 is
This is a locus that monotonously reduces the distance from the aperture 12. The reason why the first lens group 11 and the second lens group 13 do not always move on this locus, but are used to determine the stop position when stopping stepwise is called the “basic” locus. is there.
【００１１】本実施形態は、第１レンズ群１１、第２レ
ンズ群１３が以上のようなズーミング基礎軌跡を有し、
絞り１２が移動しないズームレンズをステップズーム化
するに当たり、その第１レンズ群１１と第２レンズ群１
３の停止位置について制約を与えることにより、小型化
と絞り周辺のスペースの確保を図ったものである。その
制約は、ズーミング基礎軌跡上で第１レンズ群１１と絞
り１２の間隔が最小となる焦点距離及びその近傍を焦点
距離ステップから外したことにある。このような制約を
与えると、レンズ全長を短縮することができ、絞り１２
の周辺のスペースを確保して、絞り機構やフィルタ類の
設置を容易にすることができる。In the present embodiment, the first lens group 11 and the second lens group 13 have the above-described basic zooming trajectory,
When the zoom lens in which the aperture 12 does not move is changed to the step zoom, the first lens group 11 and the second lens group 1 are used.
By restricting the stop position of No. 3, the size is reduced and the space around the stop is secured. The restriction lies in that the focal length at which the distance between the first lens group 11 and the aperture 12 on the basic zooming locus becomes minimum and its vicinity are excluded from the focal length step. By giving such a restriction, the overall length of the lens can be reduced, and the aperture 12
A space around the device can be secured to facilitate installation of the aperture mechanism and filters.
【００１２】図１の例で具体的に述べると、広角端から
望遠端の間（両端を含む）に、ｆ１、ｆ２、ｆ３、ｆ
４、ｆ５、ｆ６、ｆ７の７段階の停止焦点距離ステップ
を有している。このうち、ｆ６とｆ７は、第１レンズ群
の基礎軌跡のを挟んでその前後に位置しており、かつｆ
６とｆ７における第１レンズ群１１の停止位置は同一で
ある。図１、表２から明らかなように、この実施形態で
は、焦点距離ステップは、ズーミング時に第２レンズ群
１３の移動量が等ピッチになるように設定されている。
このように焦点距離ステップを定めると、焦点距離ピッ
チが等ピッチとなり、さらには第２レンズ群を移動させ
るための制御が容易になるという利点がある。表２は、
各焦点距離ステップでのＦナンバーＦNO、焦点距離ｆ、
半画角ｗ（゜）、レンズ間隔Ｄ８、ＤＳ、Ｄ１６のデー
タである。また、回転対称非球面は次式で定義される。 x=cy2/[1+[1-(1+K)c2y2]1/2]+A4y4+A6y6+A8y8 +A10y10+
A12y12・・・ （但し、cは曲率（１／Ｒ）、ｙは光軸からの高さ、Ｋ
は円錐係数、Ａ４、Ａ６、Ａ８、Ａ１０・・・・・は各
次数の非球面係数）More specifically, referring to the example of FIG. 1, f1, f2, f3, f are provided between the wide-angle end and the telephoto end (including both ends).
It has seven stop focal length steps of 4, f5, f6 and f7. Of these, f6 and f7 are located before and after the basic trajectory of the first lens group, and
The stop positions of the first lens group 11 at 6 and f7 are the same. As is clear from FIG. 1 and Table 2, in this embodiment, the focal length step is set so that the amount of movement of the second lens group 13 becomes equal during zooming.
When the focal length step is determined in this manner, there is an advantage that the focal length pitch becomes equal pitch, and further, the control for moving the second lens group is facilitated. Table 2
F number F NO at each focal length step, focal length f,
This is data of a half angle of view w (゜) and lens intervals D8, DS, and D16. The rotationally symmetric aspheric surface is defined by the following equation. x = cy 2 / [1+ [1- (1 + K) c 2 y 2 ] 1/2 ] + A4y 4 + A6y 6 + A8y 8 + A10y 10 +
A12y 12 ... (where c is the curvature (1 / R), y is the height from the optical axis, K
Is a conical coefficient, and A4, A6, A8, A10... Are aspherical coefficients of respective orders.
【００１３】[0013]
【表１】 面 No. R D Nd νd 1 23.001 1.300 1.83481 42.7 2 9.519 3.064 - - 3 -78.783 2.111 1.80518 25.4 4 -18.069 0.500 - - 5 -50.606 1.100 1.83400 37.2 6 8.208 1.724 - - 7 10.277 2.200 1.80518 25.4 8 28.368 D8 - - 絞り ∞ DS - - 9 8.837 2.391 1.65160 58.5 10 66.089 0.123 - - 11 10.132 2.892 1.58913 61.2 12 -26.075 0.438 - - 13 -16.474 1.200 1.80518 25.4 14 12.656 1.875 - - 15* 23.608 1.827 1.66910 55.4 16 -53.449 D16 - - 17 ∞ 5.000 1.51633 64.1 18 ∞ - - - ＊は回転対称非球面。 非球面データ（表示していない非球面係数は0.00である。）： 面Ｎｏ． Ｋ Ａ４ Ａ６ Ａ８ 15 0.00 -0.7345×10-3 -0.1270×10-4 -0.2706×10-6 [Table 1] Surface No.RD Nd νd 1 23.001 1.300 1.83481 42.7 2 9.519 3.064--3 -78.783 2.111 1.80518 25.4 4 -18.069 0.500--5 -50.606 1.100 1.83400 37.2 6 8.208 1.724--7 10.277 2.200 1.80518 25.4 8 28.368 D8--Aperture ∞ DS--9 8.837 2.391 1.65160 58.5 10 66.089 0.123--11 10.132 2.892 1.58913 61.2 12 -26.075 0.438--13 -16.474 1.200 1.80518 25.4 14 12.656 1.875--15 * 23.608 1.827 1.66910 55.4 16 -53.449 D16 --17 ∞ 5.000 1.51633 64.1 18 ∞---* indicates a rotationally symmetric aspherical surface. Aspherical surface data (the aspherical coefficient not shown is 0.00): Surface No. K A4 A6 A8 15 0.00 -0.7345 × 10 -3 -0.1270 × 10 -4 -0.2706 × 10 -6
【００１４】[0014]
【表２】 FNO＝1：2.8-3.1-3.3-3.7-4.1-4.5-5.1 f＝5.28-6.65-8.02-9.39-10.76-12.13-13.50 W＝33.4-27.2-22.8-19.6-17.2-15.3-13.8 D8＝13.016-8.282-5.607-4.090-3.288-2.959-2.959 DS＝8.990-7.698-6.406-5.114-3.822-2.530-1.238 D16＝5.752-7.044-8.336-9.628-10.920-12.212-13.504[Table 2] F NO = 1: 2.8-3.1-3.3-3.7-4.1-4.5-5.1 f = 5.28-6.65-8.02-9.39-10.76-12.13-13.50 W = 33.4-27.2-22.8-19.6-17.2-15.3 -13.8 D8 = 13.016-8.282-5.607-4.090-3.288-2.959-2.959 DS = 8.990-7.698-6.406-5.114-3.822-2.530-1.238 D16 = 5.752-7.044-8.336-9.628-10.920-12.212-13.504
【００１５】図２は、本発明によるステップズームレン
ズの第二の実施形態を示している。表３、表４は、その
レンズデータである。このレンズ系は、具体的なレンズ
構成は第一の実施形態とは異なるが、物体側から順に、
負のパワーの第１レンズ群１１、絞り１２、正のパワー
の第２レンズ群１３を備え、ズーミング中、第１レンズ
群１１と第２レンズ群１３は可動であり、絞り１２はズ
ーミング中その位置が固定である点、及び像面の前に平
行平面板１４が配置されている点では、第一の実施形態
と同じである。FIG. 2 shows a second embodiment of the step zoom lens according to the present invention. Tables 3 and 4 show the lens data. This lens system has a specific lens configuration different from that of the first embodiment, but in order from the object side,
The zoom lens includes a first lens group 11 having a negative power, an aperture 12, and a second lens group 13 having a positive power. The first lens group 11 and the second lens group 13 are movable during zooming, and the aperture 12 is moved during zooming. The point that the position is fixed and the point that the parallel plane plate 14 is arranged in front of the image plane are the same as those of the first embodiment.
【００１６】ステップズームを実現する上での第１レン
ズ群１１と第２レンズ群１３のズーミング基礎軌跡も、
第一の実施形態と同様であり、ズーミング基礎軌跡上で
第１レンズ群１１と絞り１２の間隔が最小となる焦点距
離及びその近傍を焦点距離ステップから外している。The basic locus of zooming of the first lens group 11 and the second lens group 13 for realizing the step zoom is
As in the first embodiment, the focal length at which the distance between the first lens group 11 and the aperture 12 becomes minimum on the basic zooming locus and its vicinity are excluded from the focal length step.
【００１７】この実施形態では、広角端から望遠端の間
（両端を含む）に、ｆ１、ｆ２、ｆ３、ｆ４、ｆ５、ｆ
６の６段階の停止焦点距離ステップを有し、このうち、
ｆ５とｆ６は、第１レンズ群１１の基礎軌跡のを挟んで
その前後に位置し、かつ、ｆ５とｆ６の第１レンズ群１
１の停止位置は同一である。図２、表４から明らかなよ
うに、この実施形態では、焦点距離ステップは、ズーミ
ング時に第２レンズ群１３の移動量が、該第２レンズ群
１３の最小移動量の整数倍になるように設定されてい
る。このように焦点距離ステップを定めると、第２レン
ズ群１３を移動させるための制御が容易になるという利
点がある。In this embodiment, f1, f2, f3, f4, f5, f are provided between the wide-angle end and the telephoto end (including both ends).
6 stop focal length steps of 6, of which
f5 and f6 are located before and after the basic trajectory of the first lens group 11, and the first lens group 1 of f5 and f6.
The stop positions of 1 are the same. As is clear from FIG. 2 and Table 4, in this embodiment, the focal length step is such that the moving amount of the second lens group 13 during zooming is an integral multiple of the minimum moving amount of the second lens group 13. Is set. When the focal length step is determined in this manner, there is an advantage that control for moving the second lens group 13 is facilitated.
【００１８】[0018]
【表３】 面 No. R D Nd νd 1* 12.093 1.200 1.66910 55.4 2 5.738 4.381 - - 3 -27.439 1.100 1.83400 37.2 4 13.687 0.748 - - 5 13.013 2.305 1.80518 25.4 6 -162.028 D6 - - 絞り ∞ DS - - 7 23.881 2.004 1.81600 46.6 8 -55.291 0.100 - - 9 13.847 2.600 1.48749 70.2 10 -13.847 1.000 1.80518 25.4 11 -53.397 4.678 - - 12 13.711 1.000 1.84666 23.8 13 7.373 0.991 - - 14 30.093 2.000 1.61772 49.8 15 -78.471 1.182 - - 16 13.391 2.000 1.83481 42.7 17 21.092 D17 - - 18 ∞ 5.000 1.51633 64.1 19 ∞ - - - ＊は回転対称非球面。 非球面データ（表示していない非球面係数は0.00である。）： 面Ｎｏ． Ｋ Ａ４ Ａ６ Ａ８ 1 0.00 0.9806×10-4 0.6760×10-6 0.1711×10-7 [Table 3] Surface No.RD Nd νd 1 * 12.093 1.200 1.66910 55.4 2 5.738 4.381--3 -27.439 1.100 1.83400 37.2 4 13.687 0.748--5 13.013 2.305 1.80518 25.4 6 -162.028 D6--Aperture ∞ DS--7 23.881 2.004 1.81600 46.6 8 -55.291 0.100--9 13.847 2.600 1.48749 70.2 10 -13.847 1.000 1.80518 25.4 11 -53.397 4.678--12 13.711 1.000 1.84666 23.8 13 7.373 0.991--14 30.093 2.000 1.61772 49.8 15 -78.471 1.182--16 13.391 2.000 1.83481 42.7 17 21.092 D17--18 ∞ 5.000 1.51633 64.1 19 ∞---* is a rotationally symmetric aspherical surface. Aspherical surface data (the aspherical coefficient not shown is 0.00): Surface No. K A4 A6 A8 1 0.00 0.9806 × 10 -4 0.6760 × 10 -6 0.1711 × 10 -7
【００１９】[0019]
【表４】 FNO＝1：2.8-3.0-3.1-3.4-4.0-5.2 f＝5.76-6.58-7.39-9.03-11.48-14.75 W＝33.3-29.6-26.6-22.1-17.6-13.8 D6＝12.201-9.247-7.135-4.519-2.900-2.900 DS＝10.453-9.603-8.753-7.052-4.501-1.100 D17=3.646-4.496-5.346-7.047-9.598-12.999[Table 4] F NO = 1: 2.8-3.0-3.1-3.4-4.0-5.2 f = 5.76-6.58-7.39-9.03-11.48-14.75 W = 33.3-29.6-26.6-22.1-17.6-13.8 D6 = 12.201- 9.247-7.135-4.519-2.900-2.900 DS = 10.453-9.603-8.753-7.052-4.501-1.100 D17 = 3.646-4.496-5.346-7.047-9.598-12.999
【００２０】図３は、本発明によるステップズームレン
ズの第三の実施形態を示している。表５、表６は、その
レンズデータである。このレンズ系は第一、第二の実施
形態とは異なり、像面の前に配置されている平行平面板
１４の前方に第３レンズ群１５を有する。具体的なレン
ズ構成は、物体側から順に、負のパワーの第１レンズ群
１１、絞り１２、正のパワーの第２レンズ群１３、正の
パワーの第３レンズ群１５を備え、ズーミング中、第１
レンズ群１１と第２レンズ群１３は可動であり、絞り１
２及び第３レンズ群１５はズーミング中その位置が固定
である。なお、第３レンズ群は、正負いずれも可能であ
る。FIG. 3 shows a third embodiment of the step zoom lens according to the present invention. Tables 5 and 6 show the lens data. This lens system differs from the first and second embodiments in that it has a third lens group 15 in front of a plane-parallel plate 14 arranged in front of the image plane. A specific lens configuration includes, in order from the object side, a first lens group 11 having a negative power, an aperture 12, a second lens group 13 having a positive power, and a third lens group 15 having a positive power. First
The lens group 11 and the second lens group 13 are movable,
The positions of the second and third lens groups 15 are fixed during zooming. The third lens group can be either positive or negative.
【００２１】ステップズームを実現する上での第１レン
ズ群１１と第２レンズ群１３のズーミング基礎軌跡も、
第一、第二の実施形態と同様であり、ズーミング基礎軌
跡上で第１レンズ群１１と絞り１２の間隔が最小となる
焦点距離及びその近傍を焦点距離ステップから外してい
る。The basic locus of zooming of the first lens group 11 and the second lens group 13 for realizing the step zoom is
As in the first and second embodiments, the focal length at which the interval between the first lens group 11 and the aperture 12 becomes minimum on the basic zooming locus and its vicinity are excluded from the focal length step.
【００２２】この実施形態では、広角端から望遠端の間
（両端を含む）に、ｆ１、ｆ２、ｆ３、ｆ４、ｆ５、ｆ
６の６段階の停止焦点距離ステップを有し、このうち、
ｆ５とｆ６は、第１レンズ群１１の基礎軌跡のを挟んで
その前後に位置し、かつ、ｆ５とｆ６の第１レンズ群１
１の停止位置は同一である。図３、表５から明らかなよ
うに、この実施形態では、焦点距離ステップは、ズーミ
ング時に第２レンズ群１３の移動量が、該第２レンズ群
１３の最小移動量の整数倍になるように設定されてい
る。このように焦点距離ステップを定めると、第２レン
ズ群１３を移動させるための制御が容易になるという利
点がある。In this embodiment, f1, f2, f3, f4, f5, f are provided between the wide-angle end and the telephoto end (including both ends).
6 stop focal length steps of 6, of which
f5 and f6 are located before and after the basic trajectory of the first lens group 11, and the first lens group 1 of f5 and f6.
The stop positions of 1 are the same. As is clear from FIG. 3 and Table 5, in this embodiment, the focal length step is such that the moving amount of the second lens group 13 during zooming is an integral multiple of the minimum moving amount of the second lens group 13. Is set. When the focal length step is determined in this manner, there is an advantage that control for moving the second lens group 13 is facilitated.
【００２３】[0023]
【表５】 面 No. R D Nd νd 1* 12.356 1.300 1.66910 55.4 2 6.250 4.622 - - 3 -70.102 1.100 1.72000 50.2 4 12.351 1.328 - - 5 11.946 2.200 1.80518 25.4 6 34.386 D6 - - 絞り ∞ DS - - 7 8.937 2.341 1.58913 61.2 8 109.840 0.582 - - 9 9.247 3.000 1.48749 70.2 10 -26.849 1.200 1.80518 25.4 11 14.316 1.635 - - 12* 19.132 2.000 1.66910 55.4 13 62.488 D13 - - 14 15.870 2.500 1.74077 27.8 15 16.617 4.001 - - 16 ∞ 5.000 1.51633 64.1 17 ∞ - - - ＊は回転対称非球面。 非球面データ（表示していない非球面係数は0.00である。）： 面Ｎｏ． Ｋ Ａ４ Ａ６ Ａ８ 1 0.00 0.6085×10-4 0.4954×10-6 0.9721×10-8 12 0.00 -0.7024×10-3 -0.8844×10-5 -0.3487×10-6 [Table 5] Surface No.RD Nd νd 1 * 12.356 1.300 1.66910 55.4 2 6.250 4.622--3 -70.102 1.100 1.72000 50.2 4 12.351 1.328--5 11.946 2.200 1.80518 25.4 6 34.386 D6--Aperture ∞ DS--7 8.937 2.341 1.58913 61.2 8 109.840 0.582--9 9.247 3.000 1.48749 70.2 10 -26.849 1.200 1.80518 25.4 11 14.316 1.635--12 * 19.132 2.000 1.66910 55.4 13 62.488 D13--14 15.870 2.500 1.74077 27.8 15 16.617 4.001--16 ∞ 5.000 1.51633 64.1 17 ∞---* is a rotationally symmetric aspherical surface. Aspherical surface data (the aspherical coefficient not shown is 0.00): Surface No. KA4 A6 A8 1 0.00 0.6085 × 10 -4 0.4954 × 10 -6 0.9721 × 10 -8 12 0.00 -0.7024 × 10 -3 -0.8844 × 10 -5 -0.3487 × 10 -6
【００２４】[0024]
【表６】 FNO＝1：2.8-3.0-3.2-3.4-3.9-5.4 f＝5.60-6.62-7.64-8.65-10.69-14.75 W＝34.3-29.5-25.9-23.0-18.8-13.8 D6＝11.379-8.038-5.862-4.439-2.991-2.991 DS＝10.246-9.218-8.190-7.163-5.108-0.998 D13=0.200-1.228-2.255-3.282-5.338-9.448[Table 6] F NO = 1: 2.8-3.0-3.2-3.4-3.9-5.4 f = 5.60-6.62-7.64-8.65-10.69-14.75 W = 34.3-29.5-25.9-23.0-18.8-13.8 D6 = 11.379- 8.038-5.862-4.439-2.991-2.991 DS = 10.246-9.218-8.190-7.163-5.108-0.998 D13 = 0.200-1.228-2.255-3.282-5.338-9.448
【００２５】[0025]
【発明の効果】本発明によれば、第１レンズ群が、広角
端から望遠端へのズーミング時に、絞りとの距離を縮小
した後再び拡大するようなズーミング基礎軌跡を描くズ
ームレンズにステップズームレンズを適用して、小型化
を図り、絞り周辺のスペースを確保することができる。According to the present invention, step zooming is performed on a zoom lens in which the first lens group draws a zooming basic trajectory in which the distance from the aperture is reduced and then enlarged again during zooming from the wide-angle end to the telephoto end. By using a lens, it is possible to reduce the size and secure a space around the stop.
【図１】本発明によるステップズームレンズの第一の実
施形態のレンズ構成図およびズーミング基礎軌跡を示す
図である。FIG. 1 is a diagram illustrating a lens configuration diagram and a basic zooming locus of a first embodiment of a step zoom lens according to the present invention.
【図２】本発明によるステップズームレンズの第二の実
施形態のレンズ構成図およびズーミング基礎軌跡を示す
図である。FIG. 2 is a diagram illustrating a lens configuration diagram and a basic zooming locus of a second embodiment of a step zoom lens according to the present invention.
【図３】本発明によるステップズームレンズの第三の実
施形態のレンズ構成図およびズーミング基礎軌跡を示す
図である。FIG. 3 is a diagram illustrating a lens configuration diagram and a basic zooming locus of a third embodiment of a step zoom lens according to the present invention.
１１ 第１レンズ群 １２ 絞り １３ 第２レンズ群 １４ 平行平面板 １５ 第３レンズ群 Ｘ 第２レンズ群１３の１ステップ当たりの最小移動
量DESCRIPTION OF SYMBOLS 11 1st lens group 12 Aperture 13 2nd lens group 14 Parallel plane plate 15 3rd lens group X Minimum movement amount of 1st step of 2nd lens group 13
Claims (6)
１レンズ群と、ズーミングに際してその位置が固定の絞
りと、正の屈折力の可動の第２レンズ群とを有し、 像位置を変化させずに焦点距離を変化させる第１レンズ
群のズーミング基礎軌跡が、広角端から望遠端へのズー
ミング時に、絞りとの距離を縮小した後、再び絞りとの
距離を拡大し、第２レンズ群の同ズーミング基礎軌跡
が、絞りとの距離を単調に変化させるズームレンズにお
いて、 第１レンズ群と第２レンズ群を、上記ズーミング基礎軌
跡上で間隔をおいて停止させるステップズームとし、 かつ、上記ズーミング基礎軌跡上で第１レンズ群と絞り
の間隔が最小となる焦点距離及びその近傍を停止焦点距
離ステップから外したことを特徴とするステップズーム
レンズ。1. An optical system comprising, in order from the object side, a movable first lens group having a negative refractive power, a stop whose position is fixed during zooming, and a movable second lens group having a positive refractive power. The zooming basic trajectory of the first lens group, which changes the focal length without changing the position, reduces the distance to the stop when zooming from the wide-angle end to the telephoto end, and then increases the distance to the stop again. In a zoom lens in which the same zooming basic locus of the two lens groups monotonously changes the distance to the stop, a step zoom in which the first lens group and the second lens group are stopped at intervals on the zooming basic locus, A step zoom lens wherein the focal length at which the distance between the first lens group and the aperture is minimum on the basic zooming locus and the vicinity thereof are excluded from the stop focal length step.
おいて、第１レンズ群の停止焦点距離ステップは、第１
レンズ群と絞りとの間隔が最小となるズーミング基礎軌
跡の頂点の前後に少なくとも１つずつ以上設けられてい
るステップズームレンズ。2. The step zoom lens according to claim 1, wherein the stop focal length step of the first lens group is the first zoom lens.
A step zoom lens provided at least one before and after a vertex of a zooming basic locus that minimizes the distance between the lens group and the aperture.
おいて、頂点の前後の第１レンズ群の停止位置は、同一
位置であるステップズームレンズ。3. The step zoom lens according to claim 2, wherein the stop positions of the first lens group before and after the vertex are the same position.
ステップズームレンズにおいて、さらにズーミングに際
してその位置が固定の第３レンズ群を備えているステッ
プズームレンズ。4. The step zoom lens according to claim 1, further comprising a third lens group whose position is fixed during zooming.
ステップズームレンズにおいて、ズーミング時に第２レ
ンズ群の移動量が等ピッチになるように焦点距離ステッ
プが設定されているステップズームレンズ。5. The step zoom lens according to claim 1, wherein a focal length step is set so that a movement amount of the second lens group becomes equal pitch during zooming.
ステップズームレンズにおいて、ズーミング時に第２レ
ンズ群の移動量が該第２レンズ群の最小移動量の整数倍
になるように焦点距離ステップが設定されているステッ
プズームレンズ。6. The step zoom lens according to claim 1, wherein a moving distance of the second lens group during zooming is an integral multiple of a minimum moving distance of the second lens group. Step zoom lens with steps set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11179408A JP2000081571A (en) | 1998-06-26 | 1999-06-25 | Step zoom lens |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10-181031 | 1998-06-26 | ||
| JP18103198 | 1998-06-26 | ||
| JP11179408A JP2000081571A (en) | 1998-06-26 | 1999-06-25 | Step zoom lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000081571A true JP2000081571A (en) | 2000-03-21 |
Family
ID=26499271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11179408A Pending JP2000081571A (en) | 1998-06-26 | 1999-06-25 | Step zoom lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000081571A (en) |
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| JP2006091643A (en) * | 2004-09-27 | 2006-04-06 | Fujinon Corp | Variable power optical system |
| WO2008056512A1 (en) * | 2006-11-10 | 2008-05-15 | Sharp Kabushiki Kaisha | Driving method for zoom lens device, image pickup device using the method, and mobile information device |
| JP2008233284A (en) * | 2007-03-19 | 2008-10-02 | Nikon Corp | Zoom lens, optical device, and imaging method |
| WO2013031189A1 (en) * | 2011-08-29 | 2013-03-07 | 富士フイルム株式会社 | Zoom lens and imaging device |
| WO2013031183A1 (en) * | 2011-08-29 | 2013-03-07 | 富士フイルム株式会社 | Zoom lens and imaging device |
| WO2013031184A1 (en) * | 2011-08-29 | 2013-03-07 | 富士フイルム株式会社 | Zoom lens and imaging device |
| WO2013031186A1 (en) * | 2011-08-29 | 2013-03-07 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JPWO2013031178A1 (en) * | 2011-08-29 | 2015-03-23 | 富士フイルム株式会社 | Zoom lens and imaging device |
| CN111650735A (en) * | 2020-08-10 | 2020-09-11 | 嘉兴中润光学科技有限公司 | Large wide-angle camera device and zoom lens |
-
1999
- 1999-06-25 JP JP11179408A patent/JP2000081571A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006091643A (en) * | 2004-09-27 | 2006-04-06 | Fujinon Corp | Variable power optical system |
| JP4596418B2 (en) * | 2004-09-27 | 2010-12-08 | 富士フイルム株式会社 | Variable magnification optical system |
| WO2008056512A1 (en) * | 2006-11-10 | 2008-05-15 | Sharp Kabushiki Kaisha | Driving method for zoom lens device, image pickup device using the method, and mobile information device |
| US8212898B2 (en) | 2006-11-10 | 2012-07-03 | Sharp Kabushiki Kaisha | Driving method for zoom lens device, image pickup device using the method, and mobile information device |
| JP2008233284A (en) * | 2007-03-19 | 2008-10-02 | Nikon Corp | Zoom lens, optical device, and imaging method |
| WO2013031186A1 (en) * | 2011-08-29 | 2013-03-07 | 富士フイルム株式会社 | Zoom lens and imaging device |
| WO2013031183A1 (en) * | 2011-08-29 | 2013-03-07 | 富士フイルム株式会社 | Zoom lens and imaging device |
| WO2013031184A1 (en) * | 2011-08-29 | 2013-03-07 | 富士フイルム株式会社 | Zoom lens and imaging device |
| WO2013031189A1 (en) * | 2011-08-29 | 2013-03-07 | 富士フイルム株式会社 | Zoom lens and imaging device |
| CN103842882A (en) * | 2011-08-29 | 2014-06-04 | 富士胶片株式会社 | Zoom lens and imaging device |
| JPWO2013031186A1 (en) * | 2011-08-29 | 2015-03-23 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JPWO2013031183A1 (en) * | 2011-08-29 | 2015-03-23 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JPWO2013031184A1 (en) * | 2011-08-29 | 2015-03-23 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JPWO2013031178A1 (en) * | 2011-08-29 | 2015-03-23 | 富士フイルム株式会社 | Zoom lens and imaging device |
| US9046675B2 (en) | 2011-08-29 | 2015-06-02 | Fujifilm Corporation | Zoom lens and imaging apparatus |
| CN111650735A (en) * | 2020-08-10 | 2020-09-11 | 嘉兴中润光学科技有限公司 | Large wide-angle camera device and zoom lens |
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