Zoom lens and imaging device

Abstract

To provide, for example, a zoom lens advantageous in terms of a wide angle of view, high zoom ratio, small size, and high optical performance over the entire zoom range.SOLUTION: A zoom lens has, in order from an object side to an image side, a first lens group having a positive refractive power that does not move for zooming, one or more lens groups having a negative refractive power that move to the image side in zooming from a wide angle end to a telephoto end, and two or more lens groups having a positive refractive power that move to the object side in zooming from the wide angle end to the telephoto end. In zooming from the wide angle end to the telephoto end, a lens group having the largest amount of movement, of the one or more lens groups having a negative refractive power, is defined as the N-th lens group, and a lens group having the largest amount of movement, of the two or more lens groups having a positive refractive power, as the P-th lens group. The focal length of the first lens group, the focal lengths at the wide angle end and the telephoto end, the difference in the distance from the N-th lens group to an image surface on an optical axis between the wide angle end and the telephoto end, and the difference in the distance from the P-th lens group to the image surface on the optical axis between the wide angle end and the telephoto end, are appropriately set.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a zoom lens and an imaging device.

Background Art

[0002] In imaging devices such as television cameras, movie cameras, and photographic cameras, there is a demand for a small-sized zoom lens having a wide angle of view, a high zoom ratio, and high optical performance. Further, for a zoom lens, high resolution is required over the entire imaging area of a high-resolution imaging device in a professional-use camera.

[0003] Such zoom lenses of Patent Documents 1 and 2 are composed of a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power, in order from the object side to the image side. In this zoom lens, the second to fourth lens groups move during zooming.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In order to obtain a zoom ratio exceeding 130 in the zoom lens as described above, it becomes difficult to correct chromatic aberration at the telephoto end.

[0006] An object of the present invention is to provide, for example, a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, small size, and high optical performance over the entire zoom range.

Means for Solving the Problems

[0007] It should be noted that there seems to be an error in the original text where the line break in is not properly translated in the provided rules. I've marked it as "X39" and "X52" in the translation for clarity. If this is not acceptable, the rules might need to be adjusted to handle such cases more gracefully. To achieve the above objective, the zoom lens of the present invention comprises, in order from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, and a lens that moves towards the image side during zooming from the wide-angle end to the telephoto end. 1 or 2 A group of lenses with negative refractive power. The first intermediate group consisting of And, as you zoom from the wide-angle end to the telephoto end, at least two positive refractive lens groups move toward the object. The second intermediate group consists of and , consisting of a lens group positioned closest to the image and not moving for zooming, It is a zoom lens, When zooming, the spacing between adjacent lens groups changes. In the zoom range from the wide-angle end to the telephoto end, First Interim The lens group with the largest amount of movement among the group is designated as the Nth lens group, and the above Second Interim Let the lens group with the largest amount of movement in the group be the P lens group, the focal length of the first lens group be f1, the focal length of the zoom lens at the wide-angle end be fw, the focal length of the zoom lens at the telephoto end be ft, the difference between the distance along the optical axis from the N lens group to the image plane at the wide-angle end and the distance along the optical axis from the N lens group to the image plane at the telephoto end be mn, and the difference between the distance along the optical axis from the P lens group to the image plane at the wide-angle end and the distance along the optical axis from the P lens group to the image plane at the telephoto end be mp 、 The above at the wide-angle end First Interim When the combined focal length of the group is fvw, 4.35 <ft / f1<6.00 1.0 < |mn / mp| < 2.0 0.02 <fw / f1<0.05 -15.0 <f1 / fvw≦-10.822 It is characterized by satisfying the following conditional expression. [Effects of the Invention]

[0008] According to the present invention, for example, it is possible to provide a zoom lens that is advantageous in terms of wide angle of view, high zoom ratio, compact size, and high optical performance across the entire zoom range. [Brief explanation of the drawing]

[0009] [Figure 1]Lens cross-sectional view at infinity focus at the wide-angle end of Numerical Example 1 [Figure 2] Aberration diagrams at infinity focus at the wide-angle end (a), f = 220.03 mm (b), and telephoto end (c) of Numerical Example 1 [Figure 3] Lens cross-sectional view at infinity focus at the wide-angle end of Numerical Example 2 [Figure 4] Aberration diagrams at infinity focus at the wide-angle end (a), f = 208.08 mm (b), and telephoto end (c) of Numerical Example 2 [Figure 5] Lens cross-sectional view at infinity focus at the wide-angle end of Numerical Example 3 [Figure 6] Aberration diagrams at infinity focus at the wide-angle end (a), f = 260.97 mm (b), and telephoto end (c) of Numerical Example 3 [Figure 7] Lens cross-sectional view at infinity focus at the wide-angle end of Numerical Example 4 [Figure 8] Aberration diagrams at infinity focus at the wide-angle end (a), f = 210.60 mm (b), and telephoto end (c) of Numerical Example 4 [Figure 9] Lens cross-sectional view at infinity focus at the wide-angle end of Numerical Example 5 [Figure 10] Aberration diagrams at infinity focus at the wide-angle end (a), f = 221.43 mm (b), and telephoto end (c) of Numerical Example 5 [Figure 11] Lens cross-sectional view at infinity focus at the wide-angle end of Numerical Example 6 [Figure 12] Aberration diagrams at infinity focus at the wide-angle end (a), f = 251.82 mm (b), and telephoto end (c) of Numerical Example 6 [Figure 13] Lens cross-sectional view at infinity focus at the wide-angle end of Numerical Example 7 [Figure 14] Aberration diagrams at infinity focus at the wide-angle end (a), 219.95 mm (b), and telephoto end (c) of Numerical Example 7 [Figure 15] Schematic diagram of the main part of the imaging device of the present invention

Mode for Carrying Out the Invention

[0010] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. First, the features of the zoom lens of the present invention will be explained according to each conditional formula. In order to achieve a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance across the entire zoom range, the refractive power of the first lens group and the amount of movement of the lens group that moves during zooming are defined.

[0011] The zoom lens of the present invention comprises, in order from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, at least one lens group with negative refractive power that moves toward the image side when zooming from the wide-angle end to the telephoto end, and at least two lens groups with positive refractive power that move toward the object side when zooming from the wide-angle end to the telephoto end. The first lens group L1 consists of an eleventh lens group L11 that does not move when in focus, and a twelfth lens group L12 with positive refractive power that moves when focusing from the infinity side to the near side. When zooming from the wide-angle end to the telephoto end, the lens group with the largest movement among at least one negative refractive power lens group that moves toward the image side is designated as the Nth lens group, and the lens group with the largest movement among at least two positive refractive power lens groups that move toward the object side is designated as the P lens group, and when the focal length of the first lens group is f1, the focal length at the wide-angle end is fw, the focal length at the telephoto end is ft, and the difference in positions of the Nth lens group and the P lens group from the image plane on the optical axis at the wide-angle end and telephoto end is mn and mp, respectively, 4.35 <ft / f1<6.00 ···(1) 1.0 < |mn / mp| < 2.0 ... (2) 0.02 <fw / f1<0.05 ···(3) The following condition is satisfied. With this configuration, the zoom lens of the present invention has a wide-angle field of view of about 60 to 70 degrees, a telephoto field of view of about 0.4 to 0.7 degrees, a zoom ratio of about 130 to 160, and can achieve high optical performance while being small and lightweight.

[0012] Equation (1) specifies the ratio of the focal length at the telephoto end to the focal length of the first lens group. Equation (2) specifies the ratio of the amount of movement of the negative refractive power lens group that moves toward the image side and the positive refractive power lens group that moves toward the object side when zooming from the wide-angle end to the telephoto end. Equations (1) and (2) are specified to achieve both miniaturization of the zoom lens and correction of axial chromatic aberration while achieving a high zoom ratio. If the upper limit condition of equation (1) is not met, it is advantageous for miniaturizing the zoom lens, but the magnification of aberrations occurring in the first lens group will increase, making it difficult to properly correct the optical performance at the telephoto end, especially axial chromatic aberration. Conversely, if the lower limit condition of equation (1) is not met, the refractive power of the first lens group will be weaker, making it difficult to achieve both a high zoom ratio and miniaturization of the zoom lens.

[0013] If the upper limit condition of equation (2) is not met, the amount of movement of the Nth lens group with negative refractive power increases, which increases the lateral magnification of the Nth lens group at the telephoto end and increases the axial chromatic aberration occurring in the Nth lens group. As a result, it becomes difficult to properly correct the optical performance at the telephoto end, especially axial chromatic aberration. Conversely, if the lower limit condition of equation (2) is not met, the amount of movement of the Nth lens group, which is the main zoom group, decreases, which increases the sum of the amounts of movement of the Nth lens group and the P lens group, making it difficult to miniaturize the zoom lens.

[0014] Equation (3) specifies the ratio of the focal length at the wide-angle end to the focal length of the first lens group. The upper and lower limits of equation (3) are specified to allow for miniaturization of the zoom lens and good correction of peripheral performance at the wide-angle end. If the upper limit of equation (3) is not met, the refractive power of the first lens group becomes too strong, making it difficult to correct field curvature and distortion at the wide-angle end. Conversely, if the lower limit of equation (3) is not met, the refractive power of the first lens group becomes too weak, making it difficult to achieve both a high zoom ratio and miniaturization of the zoom lens. More preferably, equations (1), (2), and (3) should be set as follows. 4.35 <ft / f1<5.80 ···(1a) 1.40 < |mn / mp| < 1.98 ···(2a) 0.025 <fw / f1<0.040 ···(3a)

[0015] In a further embodiment of the zoom lens of the present invention, the lens group that moves toward the image side when zooming from the wide-angle end to the telephoto end is designated as the V lens group, and the combined horizontal magnification at the wide-angle end and telephoto end of the V lens group is denoted as βvw and βvt, respectively.

[0016] 2.0 < (βvt / βvw) 2 ×(fw / ft)<5.0 ···(4) The following conditions are met. Equation (4) defines the ratio of the combined horizontal magnification of the wide-angle end and the telephoto end of the V lens group (zoom contribution) and the ratio of the zoom contribution of the other lens groups. By satisfying the range of equation (4), a high magnification ratio is achieved while simultaneously miniaturizing the zoom lens and correcting axial chromatic aberration. If the upper limit condition of equation (4) is not met, the combined horizontal magnification of the V lens group at the telephoto end becomes large, and the axial chromatic aberration occurring in the V lens group becomes large. As a result, it becomes difficult to properly correct the optical performance at the telephoto end, especially axial chromatic aberration. Conversely, if the lower limit condition of equation (4) is not met, the zoom contribution of the V lens group becomes small, so the amount of movement of the lens groups other than the V lens group becomes large, making it difficult to achieve both a high magnification ratio and miniaturization of the zoom lens. More preferably, equation (4) should be set as follows. 2.5 < (βvt / βvw) 2 ×(fw / ft)<4.2 ···(4a)

[0017] In a further embodiment of the zoom lens of the present invention, the lens group that moves toward the object when zooming from the wide-angle end to the telephoto end is designated as the C lens group, and the V lens group passes through a point (state) where the combined horizontal magnification is -1x when zooming from the wide-angle end to the telephoto end, and when the combined horizontal magnification of the C lens group at zoom position fz where the combined horizontal magnification of the V lens group is -1x is denoted as βcfz, -1.00 < βcfz < -0.65 ···(5) The following condition is satisfied. Equation (5) is specified in order to miniaturize the C lens group and to correct the optical performance at the intermediate and telephoto ends of the zoom range. If the upper limit condition of equation (5) is not met, the C lens group will be located on the object side at the zoom position fz, which will increase the diameter of the C lens group and make it difficult to miniaturize the zoom lens. Conversely, if the lower limit condition of equation (5) is not met, the amount of movement of the C lens group from the zoom position fz to the telephoto end will be large, making it difficult to correct the fluctuations in spherical aberration from the intermediate to the telephoto end of the zoom range. More preferably, equation (5) should be set as follows. -0.9 < βcfz < -0.7 ···(5a)

[0018] In a further embodiment of the zoom lens of the present invention, when the lens group that moves toward the object during zooming from the wide-angle end to the telephoto end is designated as the C lens group, the V lens group passes through a point where the combined horizontal magnification is -1x during zooming from the wide-angle end to the telephoto end, and the combined horizontal magnification of the C lens group at the zoom position fz where the combined horizontal magnification of the V lens group is -1x is simultaneously -1x.

[0019] In a further embodiment of the zoom lens of the present invention, the C lens group is composed of a P1 lens group with positive refractive power and a P2 lens group with positive refractive power, in order from the object side to the image side. When the distances between adjacent optical surfaces on the optical axis of the P1 lens group and the P2 lens group at the wide-angle end and telephoto end are dw and dt, respectively, 0.1 <dt / dw<2.0 ···(6) The following condition is met. Here, the distances dw and dt between the P1 and P2 lens groups at the wide-angle and telephoto ends are the distances on the optical axis between the image-side surface of the P1 lens group and the object-side surface of the P2 lens group, respectively. Equation (6) is specified to achieve both miniaturization of the zoom lens and correction of axial chromatic aberration while achieving a high magnification ratio. If the upper limit condition of equation (6) is not met, the distance between the P1 and P2 lens groups at the telephoto end widens, and the zoom contribution of the V lens group increases. As a result, the sum of the movement amounts of the V and C lens groups decreases, but the lateral magnification of the N lens group at the telephoto end increases, and the axial chromatic aberration occurring in the N lens group increases. Conversely, if the lower limit condition of equation (6) is not met, the distance between the P1 and P2 lens groups at the wide-angle end becomes wider, making it difficult to adequately correct the variation in axial chromatic aberration from the wide-angle end to the mid-zoom range. More preferably, equation (6) should be set as follows. 0.1 <dt / dw<1.5 ···(6a)

[0020] In a further embodiment of the zoom lens of the present invention, when the lens group that moves toward the image side during zooming from the wide-angle end to the telephoto end is defined as the V lens group, and the combined focal length of the V lens group at the wide-angle end is denoted as fvw, -15.0 <f1 / fvw<-8.0 ···(7) The following condition is satisfied. Equation (7) is specified to achieve both miniaturization of the zoom lens and aberration correction across the entire zoom range. If the upper limit condition of equation (7) is not met, the refractive power of the V lens group will be weak, making it difficult to miniaturize the zoom lens. Conversely, if the lower limit condition of equation (7) is not met, the refractive power of the V lens group will be strong, making it difficult to correct aberrations well, especially from the middle to the telephoto end of the zoom range. More preferably, equation (7) should be set as follows. -13.0 <f1 / fvw<-9.5 ···(7a)

[0021] In a further embodiment of the zoom lens of the present invention, when zooming from the wide-angle end to the telephoto end, the lens group that moves toward the image side is the V lens group, and the lens group that moves toward the object side is the C lens group, and the combined focal lengths of the V lens group and the C lens group at the wide-angle end are fvw and fcw, respectively, -0.50 <fvw / fcw<-0.15 ···(8) The following condition is satisfied. Equation (8) is specified to achieve both miniaturization of the zoom lens and aberration correction across the entire zoom range. If the upper limit condition of equation (8) is not met, the refractive power of the C lens group will be weaker, the amount of movement of the C lens group will be larger, and it will be difficult to miniaturize the zoom lens. Conversely, if the lower limit condition of equation (8) is not met, the refractive power of the C lens group will be stronger, making it difficult to adequately correct aberrations in the middle of the zoom range. More preferably, equation (8) should be set as follows. -0.4 <fvw / fcw<-0.2 ···(8a)

[0022] A further embodiment of the zoom lens of the present invention is characterized in that the lens closest to the object in the first lens group is a biconcave lens. By placing a biconcave lens closest to the object in the first lens group, it becomes possible to push the image-side principal point of the first lens group toward the image side. Therefore, it is advantageous for miniaturizing the zoom lens by suppressing the increase in the lens diameter of the 11th lens group that occurs with wider angles of view.

[0023] In a further embodiment of the zoom lens of the present invention, when the focal length of the lens closest to the object in the first lens group is f1n and the d-line reference Abbe number is ν1n, -1.65 <f1n / f1<-1.10 ···(9) 37 < ν1n < 48 ···(10) The following conditions are met. Equation (9) specifies the ratio of the focal length of the first lens group to the first n lens, which is the lens closest to the object in the first lens group. Equation (10) specifies the Abbe number of the first n lens, which is the lens closest to the object in the eleventh lens group. The conditions in equations (9) and (10) are specified in order to achieve a wide angle of view, a high zoom ratio, and miniaturization of the zoom lens while effectively correcting chromatic aberration at the telephoto end. If the upper limit of equation (9) is not met, the refractive power of the first n lens becomes stronger than that of the first lens group, increasing higher-order aberrations of spherical aberration at the telephoto end and making it difficult to achieve good optical performance. Conversely, if the lower limit of the condition in equation (9) is not met, the refractive power of the first n lens becomes weaker than that of the first lens group, making it difficult to miniaturize the zoom lens. Furthermore, if the refractive power of the first n lens is weak, the correction effect of chromatic aberration generated by the positive lenses constituting the first lens group will be weak, resulting in insufficient chromatic aberration correction at the telephoto end. If the upper limit of equation (10) is not met, the difference in Abbe numbers between the positive and negative lenses constituting the first lens group will be small, and the refractive power of each lens constituting the first lens group will be strong. As a result, higher-order aberrations of spherical aberration at the telephoto end will increase, making it difficult to achieve good optical performance. Conversely, if the lower limit of equation (10) is not met, the difference in Abbe numbers between the positive and negative lenses constituting the first lens group will be large, and the refractive power of the first n lens will be weak. Therefore, the correction effect of chromatic aberration generated by the positive lenses constituting the first lens group will be weak, resulting in insufficient chromatic aberration correction at the telephoto end. More preferably, equation (9) should be set as follows. -1.63 <f1n / f1<-1.15 ···(9a)

[0024] In a further embodiment of the zoom lens of the present invention, when the average Abbe number of the positive lenses constituting the first lens group with respect to the d line is νpave, 80 < νpave < 100 ···(11) The following condition is satisfied. The conditions in equation (11) are specified in order to correct axial chromatic aberration at the telephoto end and achieve high optical performance. If the upper limit of equation (11) is not satisfied, it becomes difficult to manufacture low-dispersion glass materials. Conversely, if the lower limit of the condition in equation (11) is not satisfied, the difference in Abbe numbers between the positive and negative lenses constituting the first lens group becomes small, and the refractive power of each lens constituting the first lens group becomes strong. As a result, higher-order aberrations of spherical aberration at the telephoto end increase, making it difficult to achieve good optical performance. More preferably, equation (11) is set as follows. 87<νpave<97 ···(11a)

[0025] In a further embodiment of the zoom lens of the present invention, when the focal length at the wide-angle end is fw and the focal length at the telephoto end is ft, 125 <ft / fw<200 ···(12) The following condition is met.

[0026] Furthermore, the imaging device of the present invention is characterized by having a zoom lens of each embodiment and a solid-state image sensor having a predetermined effective imaging range for receiving the image formed by the zoom lens.

[0027] Furthermore, the optical surface of the frontmost element of the zoom lens of the present invention may be protected by attaching a protective filter and a lens equivalent to a protective filter adjacent to the object side of the zoom lens of the present invention, that is, to the object side of the first lens group. Furthermore, a biconcave lens is placed on the object side of the first lens group to push the image-side principal point of the first lens group toward the image side, thereby suppressing the increase in lens diameter of the 11th lens group due to widening the angle of view and miniaturizing the zoom lens. For this reason, when the focal length of the first lens group is f1 and the focal length of the first n lens on the object side of the first lens group is f1n, |f1 / f1n|>0.05 ···(13) The following condition is met. When equation (13) is evaluated by considering a protective filter and a lens equivalent to a protective filter attached adjacent to the object side of the zoom lens as being included in the first lens group, if equation (13) is not satisfied, then the attached object shall not be included in the first lens group, i.e., the zoom lens of the present invention.

[0028] The specific configuration of the zoom lens of the present invention will be described below, starting with the characteristics of the lens configurations of Examples 1 to 7, corresponding to numerical values ​​for Examples 1 to 7. [Examples]

[0029] Figure 1 is a cross-sectional view of a zoom lens, which is Embodiment 1 of the present invention (Numerical Embodiment 1), when it is in focus at the wide-angle end and at infinity. In Figure 2, (a) shows the longitudinal aberration diagram of Numerical Embodiment 1 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 1 at a focal length of 220.03 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 1 at the telephoto end. All aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity. The focal length values ​​are the values ​​expressed in millimeters for the Numerical Embodiments described later. This is the same for all the Numerical Embodiments described below.

[0030] In Figure 1, the lens system has a first lens group L1 with positive refractive power for focusing, arranged in order from the object side to the image side. Furthermore, when zooming from the wide-angle end to the telephoto end, it has a second lens group L2 with negative refractive power for zooming, which moves toward the image side, and a third lens group L3 with positive refractive power, which moves toward the object side. Furthermore, it has a fourth lens group L4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups L2 and L3, and corrects image plane fluctuations associated with zooming. Furthermore, it has a fifth lens group L5 that does not move for zooming and has an imaging function. In this embodiment, the Nth lens group corresponds to the second lens group L2, the P lens group corresponds to the fourth lens group L4, the V lens group corresponds to the second lens group L2, and the C lens group corresponds to the third and fourth lens groups L3 and L4. Note that a focal length of 220.03 mm is the zoom position where the combined horizontal magnification of the V lens group is -1x.

[0031] In this embodiment, the zoom system is composed of the second lens group L2, the third lens group L3, and the fourth lens group L4. SP is the aperture diaphragm, which is located between the fourth lens group L4 and the fifth lens group L5. The aperture diaphragm is fixed in the optical axis direction during zooming. P is a glass block representing a color separation prism or optical filter. I is the image plane, which, when used as an imaging optical system for broadcast television cameras, video cameras, and digital still cameras, corresponds to the imaging surface of a solid-state image sensor (photoelectric conversion element) that receives light from the image formed by the zoom lens and converts it into photoelectric energy. When used as an imaging optical system for film cameras, it corresponds to the film surface to which the image formed by the zoom lens is exposed.

[0032] In the longitudinal aberration diagram, the solid line and dashed line in the spherical aberration diagram represent the e line and the g line, respectively. The dotted line and solid line in the astigmatism diagram represent the meridional image plane and the sagittal image plane, respectively, and the dashed line, single dashed line, and dotted line in the chromatic aberration diagram represent the g line, the C line, and the F line, respectively. ω is the half-angle of view, and Fno is the F number. In the longitudinal aberration diagram, spherical aberration is drawn on a scale of 0.4 mm, astigmatism on a scale of 0.4 mm, distortion on a scale of 10%, and chromatic aberration on a scale of 0.1 mm. In each of the following embodiments, the wide-angle end and telephoto end refer to the zoom position when the second lens group L2 for zoom is located at both ends of the range in which it can move along the optical axis relative to the mechanism.

[0033] The first lens group L1 corresponds to the 1st to 12th surfaces. The second lens group L2 corresponds to the 13th to 19th surfaces, the third lens group L3 corresponds to the 20th to 25th surfaces, and the fourth lens group L4 corresponds to the 26th to 30th surfaces. The fifth lens group L5 corresponds to the 31st to 53rd surfaces. The first lens group L1 consists of the 11th lens group L11, which does not move when focusing, and the 12th lens group L12, which has a positive refractive power and moves when focusing from the infinity side to the near side. The 11th lens group L11 corresponds to the 1st to 6th surfaces, and the 12th lens group L12 corresponds to the 7th to 12th surfaces. Furthermore, the first lens group L1 consists of six lenses, in order from the object side: a biconcave lens, a biconvex lens, a biconvex lens, a biconvex lens, a concave meniscus convex lens on the image side, and a concave meniscus convex lens on the image side.

[0034] Numerical Example 1, corresponding to Example 1 above, will now be described. In all numerical examples, not just Numerical Example 1, i indicates the order of the surfaces (optical surfaces) from the object side, ri is the radius of curvature of the i-th surface from the object side, and di indicates the distance (on the optical axis) between the i-th surface and the (i+1)-th surface from the object side. Also, ndi, νdi, and θgFi represent the refractive index, Abbe number, and partial dispersion ratio of the medium (optical material) between the i-th surface and the (i+1)-th surface, and BF represents the back focus in air equivalent. The aspherical shape is expressed by the following equation, where the X-axis is in the direction of the optical axis, the H-axis is perpendicular to the optical axis, the direction of light propagation is positive, R is the radius of paraxial curvature, k is the cone constant, and A3 to A16 are aspherical coefficients. Also, "eZ" is "×10 -Z It means "...".

number

[0035] Figure 15 is a schematic diagram of an imaging device (television camera system) using the zoom lens of each embodiment as the imaging optical system. In Figure 15, 101 is a zoom lens of any of Embodiments 1 to 7. 124 is a camera. The zoom lens 101 is detachable from the camera 124. 125 is the imaging device configured by attaching the zoom lens 101 to the camera 124. The zoom lens 101 has a first lens group F, a zoom section LZ, and a rear group R for image formation. The first lens group F includes a focusing lens group. The zoom section LZ includes a second lens group, a third lens group that move along the optical axis during zooming, and a fourth lens group that moves along the optical axis to correct image plane fluctuations associated with zooming. SP is the aperture diaphragm. 114 and 115 are drive mechanisms such as helicoids and cams that drive the first lens group F and the zoom section LZ in the optical axis direction, respectively. 116-118 are motors (driving means) that electrically drive the drive mechanisms 114 and 115 and the aperture diaphragm SP. 119-121 are detectors such as encoders, potentiometers, or photosensors for detecting the position of the first lens group F and zoom section LZ on the optical axis, and the aperture diameter of the aperture diaphragm SP. In camera 124, 109 is a glass block corresponding to the optical filter and color separation optical system within camera 124, and 110 is a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor that receives the subject image formed by the zoom lens 101. Also, 111 and 122 are CPUs that control various drives of camera 124 and zoom lens 101.

[0036] In this way, by applying the zoom lens of the present invention to a television camera, an imaging device with high optical performance is realized. [Examples]

[0037] Figure 3 is a cross-sectional view of the zoom lens, which is Embodiment 2 of the present invention (Numerical Embodiment 2), when it is in focus at the wide-angle end and at infinity. In Figure 4, (a) shows the longitudinal aberration diagram of Numerical Embodiment 2 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 2 at a focal length of 208.08 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 2 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0038] In Figure 3, starting from the object side, there is a first lens group L1 with positive refractive power for focusing. Furthermore, when zooming from the wide-angle end to the telephoto end, there is a second lens group L2 with negative refractive power for zooming that moves toward the image side, and a third lens group L3 with positive refractive power that moves toward the object side. Furthermore, there is a fourth lens group L4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups L2 and L3, and corrects image plane fluctuations associated with zooming. Furthermore, there is a fifth lens group L5 that does not move for zooming and has an imaging function. In this embodiment, the Nth lens group corresponds to the second lens group L2, the P lens group corresponds to the fourth lens group L4, the V lens group corresponds to the second lens group L2, and the C lens group corresponds to the third and fourth lens groups L3 and L4. Note that a focal length of 208.08 mm is the zoom position where the combined lateral magnification of the V lens group is -1x.

[0039] In this embodiment, the second lens group L2, the third lens group L3, and the fourth lens group L4 constitute a variable magnification system. SP is an aperture diaphragm and is positioned between the fourth lens group L4 and the fifth lens group L5. Furthermore, the aperture diaphragm SP remains stationary in the optical axis direction during zooming.

[0040] The first lens group L1 corresponds to the 1st to 12th surfaces. The second lens group L2 corresponds to the 13th to 19th surfaces, the third lens group L3 corresponds to the 20th to 25th surfaces, and the fourth lens group L4 corresponds to the 26th to 30th surfaces. The fifth lens group L5 corresponds to the 31st to 53rd surfaces. The first lens group L1 consists of the 11th lens group L11, which does not move when focusing, and the 12th lens group L12, which has a positive refractive power and moves when focusing from the infinity side to the near side. The 11th lens group L11 corresponds to the 1st to 6th surfaces, and the 12th lens group L12 corresponds to the 7th to 12th surfaces. Furthermore, the first lens group L1 consists of six lenses, in order from the object side: a biconcave lens, a biconvex lens, a biconvex lens, a biconvex lens, a concave meniscus convex lens on the image side, and a concave meniscus convex lens on the image side.

[0041] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (13), and by appropriately setting the refractive power of the first lens group and the amount of movement of the lens group that moves during zooming, a zoom lens with a wide angle of view, high zoom ratio, compact and lightweight design, and high optical performance across the entire zoom range is achieved. [Examples]

[0042] Figure 5 is a cross-sectional view of the zoom lens, which is Embodiment 3 of the present invention (Numerical Embodiment 3), when it is in focus at the wide-angle end and at infinity. In Figure 6, (a) shows the longitudinal aberration diagram of Numerical Embodiment 3 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 3 at a focal length of 260.97 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 3 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0043] In Figure 5, starting from the object side, there is a first lens group L1 with positive refractive power for focusing. Furthermore, when zooming from the wide-angle end to the telephoto end, there is a second lens group L2 with negative refractive power for zooming that moves toward the image side, and a third lens group L3 with positive refractive power that moves toward the object side. Furthermore, there is a fourth lens group L4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups L2 and L3, and corrects image plane fluctuations associated with zooming. Furthermore, there is a fifth lens group L5 that does not move for zooming and has an imaging function. In this embodiment, the Nth lens group corresponds to the second lens group L2, the P lens group corresponds to the fourth lens group L4, the V lens group corresponds to the second lens group L2, and the C lens group corresponds to the third and fourth lens groups L3 and L4. Note that a focal length of 260.97 mm is the zoom position where the combined lateral magnification of the V lens group is -1x.

[0044] In this embodiment, the second lens group L2, the third lens group L3, and the fourth lens group L4 constitute a variable magnification system. SP is an aperture diaphragm and is positioned between the fourth lens group L4 and the fifth lens group L5. Furthermore, the aperture diaphragm SP remains stationary in the optical axis direction during zooming.

[0045] The first lens group L1 corresponds to the 1st to 12th surfaces. The second lens group L2 corresponds to the 13th to 19th surfaces, the third lens group L3 corresponds to the 20th to 25th surfaces, and the fourth lens group L4 corresponds to the 26th to 30th surfaces. The fifth lens group L5 corresponds to the 31st to 53rd surfaces. The first lens group L1 consists of the 11th lens group L11, which does not move when focusing, and the 12th lens group L12, which has a positive refractive power and moves when focusing from the infinity side to the near side. The 11th lens group L11 corresponds to the 1st to 6th surfaces, and the 12th lens group L12 corresponds to the 7th to 12th surfaces. Furthermore, the first lens group L1 consists of six lenses, in order from the object side: a biconcave lens, a biconvex lens, a biconvex lens, a biconvex lens, a concave meniscus convex lens on the image side, and a concave meniscus convex lens on the image side.

[0046] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (13), and by appropriately setting the refractive power of the first lens group and the amount of movement of the lens group that moves during zooming, a zoom lens with a wide angle of view, high zoom ratio, compact and lightweight design, and high optical performance across the entire zoom range is achieved. [Examples]

[0047] Figure 7 is a cross-sectional view of the zoom lens, which is Embodiment 4 (Numerical Embodiment 4) of the present invention, when it is in focus at the wide-angle end and at infinity. In Figure 8, (a) shows the longitudinal aberration diagram of Numerical Embodiment 4 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 4 at a focal length of 210.60 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 4 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0048] In Figure 7, starting from the object side, there is a first lens group L1 with positive refractive power for focusing. Furthermore, when zooming from the wide-angle end to the telephoto end, there is a second lens group L2 with negative refractive power for zooming that moves toward the image side, and a third lens group L3 and a fourth lens group L4 with positive refractive power that move toward the object side. Furthermore, there is a fifth lens group L5 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second lens group L2, the third lens group L3, and the fourth lens group L4, and corrects image plane fluctuations associated with zooming. Furthermore, there is a sixth lens group L6 that has an imaging function and does not move for zooming. In this embodiment, the Nth lens group corresponds to the second lens group L2, the P lens group corresponds to the fifth lens group L5, the V lens group corresponds to the second lens group L2, and the C lens group corresponds to the third lens group L3, the fourth lens group L4, and the fifth lens group L5. Note that a focal length of 210.60mm corresponds to the zoom position where the combined horizontal magnification of the V lens group is -1x.

[0049] In this embodiment, the variable magnification system is composed of the second lens group L2, the third lens group L3, the fourth lens group L4, and the fifth lens group L5. SP is an aperture diaphragm and is positioned between the fifth lens group L5 and the sixth lens group L6. Furthermore, the aperture diaphragm SP remains stationary in the optical axis direction during zooming.

[0050] The first lens group L1 corresponds to the first to twelfth surfaces. The second lens group L2 corresponds to the thirteenth to nineteenth surfaces, the third lens group L3 corresponds to the twenty-first to twenty-first surfaces, and the fourth lens group L4 corresponds to the twenty-second to twenty-sixth surfaces. The fifth lens group L5 corresponds to the twenty-seventh to thirty-first surfaces, and the sixth lens group L6 corresponds to the thirty-second to fifty-fourth surfaces. The first lens group L1 consists of the eleventh lens group L11, which does not move when focusing, and the twelfth lens group L12, which has a positive refractive power and moves when focusing from infinity to near focus. The eleventh lens group L11 corresponds to the first to sixth surfaces, and the twelfth lens group L12 corresponds to the seventh to twelveth surfaces. Furthermore, the first lens group L1 consists of six lenses, in order from the object side: a biconcave lens, a biconvex lens, a biconvex lens, a biconvex lens, a concave meniscus convex lens on the image side, and a concave meniscus convex lens on the image side. Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (5) and (7) to (13), and by appropriately setting the refractive power of the first lens group and the amount of movement of the lens group that moves during zooming, a zoom lens with a wide angle of view, high zoom ratio, compact and lightweight design, and high optical performance across the entire zoom range is achieved. [Examples]

[0051] Figure 9 is a cross-sectional view of the zoom lens, which is Embodiment 5 of the present invention (Numerical Embodiment 5), when it is in focus at the wide-angle end and at infinity. In Figure 10, (a) shows the longitudinal aberration diagram of Numerical Embodiment 5 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 5 at a focal length of 221.43 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 5 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0052] In Figure 9, starting from the object side, there is a first lens group L1 with positive refractive power for focusing. Furthermore, when zooming from the wide-angle end to the telephoto end, there is a second lens group L2 with negative refractive power for zooming that moves toward the image side, a third lens group L3 with negative refractive power that moves toward the image side, and a fourth lens group L4 with positive refractive power that moves toward the object side. Furthermore, there is a fifth lens group L5 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second lens group L2, the third lens group L3, and the fourth lens group L4, and corrects image plane fluctuations associated with zooming. Furthermore, there is a sixth lens group L6 that has an imaging function and does not move for zooming. In this embodiment, the Nth lens group corresponds to the third lens group L3, the P lens group corresponds to the fourth lens group L4, the V lens group corresponds to the second lens group L2 and the third lens group L3, and the C lens group corresponds to the fourth lens group L4 and the fifth lens group L5. Note that a focal length of 221.43mm corresponds to the zoom position where the combined horizontal magnification of the V lens group is -1x.

[0053] In this embodiment, the variable magnification system is composed of the second lens group L2, the third lens group L3, the fourth lens group L4, and the fifth lens group L5. SP is an aperture diaphragm and is positioned between the fifth lens group L5 and the sixth lens group L6. Furthermore, the aperture diaphragm SP remains stationary in the optical axis direction during zooming.

[0054] The first lens group L1 corresponds to the first to twelfth surfaces. The second lens group L2 corresponds to the thirteenth to seventeenth surfaces, the third lens group L3 to the eighteenth to twenty-tenth surfaces, the fourth lens group L4 to the twenty-first to twenty-sixth surfaces, and the fifth lens group L5 to the twenty-seventh to thirty-first surfaces. The sixth lens group L6 corresponds to the thirty-second to fifty-fourth surfaces. The first lens group L1 consists of the eleventh lens group L11, which does not move when focusing, and the twelfth lens group L12, which has a positive refractive power and moves when focusing from infinity to near focus. The eleventh lens group L11 corresponds to the first to sixth surfaces, and the twelfth lens group L12 corresponds to the seventh to twelveth surfaces. Furthermore, the first lens group L1 consists of six lenses, in order from the object side: a biconcave lens, a biconvex lens, a biconvex lens, a biconvex lens, a concave meniscus convex lens on the image side, and a concave meniscus convex lens on the image side.

[0055] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (13), and by appropriately setting the refractive power of the first lens group and the amount of movement of the lens group that moves during zooming, a zoom lens with a wide angle of view, high zoom ratio, compact and lightweight design, and high optical performance across the entire zoom range is achieved. [Examples]

[0056] Figure 11 is a cross-sectional view of a zoom lens, which is Embodiment 6 of the present invention (Numerical Embodiment 6), when it is in focus at the wide-angle end and at infinity. In Figure 12, (a) shows the longitudinal aberration diagram of Numerical Embodiment 6 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 6 at a focal length of 251.82 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 6 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0057] In Figure 12, starting from the object side, there is a first lens group L1 with positive refractive power for focusing. Furthermore, when zooming from the wide-angle end to the telephoto end, there is a second lens group L2 with negative refractive power for zooming that moves toward the image side, and a third lens group L3 with positive refractive power that moves toward the object side. Furthermore, there is a fourth lens group L4 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second and third lens groups L2 and L3, and corrects image plane fluctuations associated with zooming. Furthermore, there is a fifth lens group L5 that has an imaging function and does not move for zooming. In this embodiment, the Nth lens group corresponds to the second lens group L2, the P lens group corresponds to the fourth lens group L4, the V lens group corresponds to the second lens group L2, and the C lens group corresponds to the third and fourth lens groups L3 and L4. Note that a focal length of 208.08 mm is the zoom position where the combined lateral magnification of the V lens group and the combined lateral magnification of the C lens group are simultaneously -1x.

[0058] In this embodiment, the second lens group L2, the third lens group L3, and the fourth lens group L4 constitute a variable magnification system. SP is an aperture diaphragm and is positioned between the fourth lens group L4 and the fifth lens group L5. Furthermore, the aperture diaphragm SP remains stationary in the optical axis direction during zooming.

[0059] The first lens group L1 corresponds to the 1st to 12th surfaces. The second lens group L2 corresponds to the 13th to 23rd surfaces, the third lens group L3 corresponds to the 24th to 28th surfaces, and the fourth lens group L4 corresponds to the 29th to 35th surfaces. The fifth lens group L5 corresponds to the 36th to 59th surfaces. The first lens group L1 consists of the 11th lens group L11, which does not move when focusing, and the 12th lens group L12, which has a positive refractive power and moves when focusing from infinity to near. The 11th lens group L11 corresponds to the 1st to 6th surfaces, and the 12th lens group L12 corresponds to the 7th to 12th surfaces. Furthermore, the first lens group L1 consists of six lenses, in order from the object side: a biconcave lens, a biconvex lens, a biconvex lens, a biconvex lens, a concave meniscus convex lens on the image side, and a concave meniscus convex lens on the image side.

[0060] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (13), and by appropriately setting the refractive power of the first lens group and the amount of movement of the lens group that moves during zooming, a zoom lens with a wide angle of view, high zoom ratio, compact and lightweight design, and high optical performance across the entire zoom range is achieved. [Examples]

[0061] Figure 13 is a cross-sectional view of the zoom lens, which is Embodiment 7 of the present invention (Numerical Embodiment 7), when it is in focus at the wide-angle end and at infinity. In Figure 14, (a) shows the longitudinal aberration diagram of Numerical Embodiment 7 at the wide-angle end, (b) shows the longitudinal aberration diagram of Numerical Embodiment 7 at a focal length of 219.95 mm, and (c) shows the longitudinal aberration diagram of Numerical Embodiment 7 at the telephoto end. All of the aberration diagrams are longitudinal aberration diagrams when the lens is in focus at infinity.

[0062] In Figure 13, starting from the object side, there is a first lens group L1 with positive refractive power for focusing. Furthermore, when zooming from the wide-angle end to the telephoto end, there is a second lens group L2 with negative refractive power for zooming that moves toward the image side, a third lens group L3 with positive refractive power that moves toward the image side, and a fourth lens group L4 with positive refractive power that moves toward the object side. Furthermore, there is a fifth lens group L5 with positive refractive power that moves nonlinearly along the optical axis in conjunction with the movement of the second lens group L2, the third lens group L3, and the fourth lens group L4, and corrects image plane fluctuations associated with zooming. Furthermore, there is a sixth lens group L6 that has an imaging function and does not move for zooming. In this embodiment, the Nth lens group corresponds to the second lens group L2, the P lens group corresponds to the fourth lens group L4, the V lens group corresponds to the second lens group L2 and the third lens group L3, and the C lens group corresponds to the fourth lens group L4 and the fifth lens group L5. Note that a focal length of 219.95mm corresponds to the zoom position where the combined horizontal magnification of the V lens group is -1x.

[0063] In this embodiment, the variable magnification system is composed of the second lens group L2, the third lens group L3, the fourth lens group L4, and the fifth lens group L5. SP is an aperture diaphragm and is positioned between the fifth lens group L5 and the sixth lens group L6. Furthermore, the aperture diaphragm SP remains stationary in the optical axis direction during zooming.

[0064] The first lens group L1 corresponds to the first to twelfth surfaces. The second lens group L2 corresponds to the thirteenth to seventeenth surfaces, the third lens group L3 to the eighteenth to twenty-first surfaces, the fourth lens group L4 to the twenty-second to twenty-seventh surfaces, and the fifth lens group L5 to the twenty-eighth to thirty-second surfaces. The sixth lens group L6 corresponds to the thirty-third to fifty-fifth surfaces. The first lens group L1 consists of the eleventh lens group L11, which does not move when focusing, and the twelfth lens group L12, which has a positive refractive power and moves when focusing from infinity to near focus. The eleventh lens group L11 corresponds to the first to sixth surfaces, and the twelfth lens group L12 corresponds to the seventh to twelveth surfaces. Furthermore, the first lens group L1 consists of six lenses, in order from the object side: a biconcave lens, a biconvex lens, a biconvex lens, a biconvex lens, a concave meniscus convex lens on the image side, and a concave meniscus convex lens on the image side.

[0065] Table 1 shows the corresponding values ​​for each conditional expression in this embodiment. This embodiment satisfies equations (1) to (13), and by appropriately setting the refractive power of the first lens group and the amount of movement of the lens group that moves during zooming, a zoom lens with a wide angle of view, high zoom ratio, compact and lightweight design, and high optical performance across the entire zoom range is achieved.

[0066] Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its gist. The feature of the present invention is to appropriately set the lens configuration, refractive power, and glass material of the first lens group, and the effects of the present invention can be achieved even if the rear group, which is the lens group on the image side of the second lens group, has a configuration other than that of numerical examples 1 to 7.

[0067] <Numerical Example 1> Unit: mm Surface data Face number rd nd vd Effective diameter 1 -2221.349 6.00 1.83481 42.7 218.21 2 342.333 1.50 205.55 3 340.133 24.31 1.43387 95.1 204.91 4 -911.250 0.20 203.54 5 565.719 14.49 1.43387 95.1 198.63 6 -1543.644 24.80 198.74 7 376.540 17.36 1.43387 95.1 198.96 8 -3838.033 0.25 198.53 9 295.848 17.80 1.43387 95.1 193.97 10 3814.344 1.60 192.94 11 192.957 15.11 1.43387 95.1 180.65 12 420.467 (variable) 179.06 13* -238.965 2.20 2.00330 28.3 45.54 14 36.896 10.74 38.74 15 -52.546 1.45 1.80610 40.9 37.98 16 47.404 11.69 1.89286 20.4 39.04 17 -48.436 3.85 39.26 18 -38.895 2.00 1.83481 42.7 36.51 19 -128.592 (variable) 38.68 20 120.021 10.14 1.78800 47.4 82.48 21* -749.646 2.46 82.39 22 119.605 16.42 1.43875 94.7 82.54 23 -148.456 0.50 81.84 24 181.335 2.50 1.85478 24.8 75.70 25 74.456 (variable) 71.70 26 88.360 13.64 1.49700 81.5 71.29 27 -302.319 2.60 1.84666 23.8 69.97 28 10294.031 0.20 68.98 29* 293.116 6.81 1.53775 74.7 68.28 30 -219.650 (variable) 67.50 31 (aperture) ∞ 2.74 34.39 32 -607.740 1.40 1.88300 40.8 32.67 33 41.820 0.70 31.19 34 33.865 4.29 1.80810 22.8 31.34 35 91.433 4.58 30.64 36 -66.359 1.50 1.88300 40.8 29.92 37 -286.035 8.19 29.89 38 -149.141 1.50 1.89190 37.1 28.99 39 45.053 6.01 1.84666 23.8 29.14 40 -128.089 3.18 29.28 41 -43.757 1.50 1.88300 40.8 29.12 42 116.859 8.22 1.51742 52.4 30.48 43 -29.469 10.21 31.56 44 79.819 4.96 1.53172 48.8 31.41 45 -88.967 1.40 31.11 46 -82.335 1.50 1.89190 37.1 30.54 47 34.621 7.78 1.48749 70.2 30.30 48 -73.557 0.20 30.90 49 130.522 7.48 1.51633 64.1 31.25 50 -32.217 1.50 1.88300 40.8 31.26 51 -85.050 0.20 32.12 52 90.792 7.25 1.54814 45.8 32.32 53 -46.746 10.00 32.06 54 ∞ 33.00 1.60859 46.4 60.00 55 ∞ 13.20 1.51633 64.2 60.00 56 ∞ 13.00 60.00 Image plane ∞ Aspherical data Page 13 K =-1.93181e+00 A 4= 2.22919e-06 A 6= 2.38151e-08 A 8= 7.72743e-10 A10= 2.13595e-12 A12=-3.64187e-15 A14=-4.78958e-18 A16=-3.47247e-22 A 3= 2.52939e-07 A 5=-4.19447e-08 A 7=-5.95656e-09 A 9=-5.68561e-11 A11=-4.13651e-15 A13= 1.87641e-16 A15= 6.43023e-20 Page 21 K = 1.95058e+00 A 4= 3.74052e-07 A 6= 1.99549e-10 A 8= 2.51258e-13 A10=-2.73849e-17 A12=-1.59352e-19 A14=-1.48582e-23 A16=-5.53240e-27 A 3=-1.37836e-07 A 5=-2.64991e-09 A 7=-9.23121e-12 A 9=-3.74119e-15 A11= 5.03388e-18 A13= 1.89531e-21 A15= 4.46991e-25 Page 29 K =-2.00000e+00 A 4= 1.60386e-07 A 6= 1.28452e-08 A 8= 5.45892e-11 A10=-6.18393e-15 A12= 3.22244e-18 A14= 3.40708e-20 A16= 1.98023e-24 A 3=-1.02506e-06 A 5=-8.91670e-08 A 7=-1.10781e-09 A 9=-1.25958e-12 A11= 8.63627e-16 A13=-1.17716e-18 A15=-4.20681e-22 Various data Zoom ratio 144.44 Wide-angle, Medium, Telephoto Focal length 8.10 220.03 1169.95 F-number 1.76 1.76 6.08 Half-angle 34.18 1.43 0.27 Image height 5.50 5.50 5.50 Lens length 680.44 680.44 680.44 BF 13.00 13.00 13.00 d12 4.04 184.81 197.98 d19 297.46 85.16 2.00 d25 9.84 4.30 8.70 d30 2.98 40.05 105.65 d56 13.00 13.00 13.00 Entrance pupil position 129.66 2638.84 17486.29 Exit pupil position 237.07 237.07 237.07 Front principal point position 138.06 3074.94 24765.04 Back principal point position 4.90 -207.03 -1156.95 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 251.69 123.43 71.51 -18.33 2 13 -22.51 31.93 3.51 -18.59 3 20 121.34 32.01 -6.54 -25.79 4 26 118.74 23.25 5.37 -10.20 5 31 46.47 142.50 59.14 20.10

[0068] <Numerical Example 2> Unit: mm Surface data Face number rd nd vd Effective diameter 1 -1043.825 5.50 1.83481 42.7 220.03 2 366.721 1.50 207.67 3 364.032 28.91 1.43387 95.1 207.11 4 -609.037 0.20 204.84 5 646.639 15.07 1.43387 95.1 201.33 6 -1086.757 21.44 201.51 7 372.369 19.69 1.43387 95.1 202.24 8 -1701.210 0.25 201.82 9 266.948 18.73 1.43387 95.1 195.72 10 1888.740 1.60 194.58 11 179.319 16.25 1.43875 94.7 180.92 12 387.193 (Variable) 179.22 13* -218.239 2.20 2.00330 28.3 42.44 14 32.360 11.03 35.55 15 -40.060 1.45 1.80610 40.9 34.75 16 49.409 12.39 1.89286 20.4 36.48 17 -44.678 3.76 37.64 18 -35.178 2.00 1.83481 42.7 37.82 19 -70.135 (variable) 40.50 20 152.043 9.44 1.78800 47.4 79.79 21* -1353.842 6.22 80.05 22 107.185 17.31 1.43875 94.7 82.57 23 -156.466 0.50 82.09 24 152.341 2.50 1.85478 24.8 77.10 25 75.362 (variable) 73.63 26 80.922 14.65 1.49700 81.5 73.82 27 -299.009 0.50 72.71 28 415.877 2.50 1.84666 23.8 70.09 29 155.921 6.43 1.59522 67.7 68.14 30* -946.891 (variable) 67.14 31 (aperture) ∞ 2.65 34.39 32 -964.271 1.40 1.88300 40.8 32.78 33 42.981 0.58 31.38 34 33.712 4.47 1.80810 22.8 31.53 35 100.338 4.51 30.82 36 -66.006 1.50 1.88300 40.8 30.04 37 -836.881 8.65 29.96 38 -357.842 1.50 1.89190 37.1 29.29 39 40.193 6.16 1.84666 23.8 29.28 40 -272.917 2.91 29.32 41 -60.533 1.50 1.88300 40.8 29.23 42 67.074 10.21 1.51742 52.4 30.22 43 -29.932 8.33 31.68 44 55.256 5.15 1.53172 48.8 30.68 45 -121.213 1.40 30.19 46 -67.916 1.50 1.89190 37.1 29.83 47 30.576 7.87 1.48749 70.2 29.50 48 -82.637 0.20 30.18 49 186.024 7.44 1.51633 64.1 30.61 50 -29.654 1.50 1.88300 40.8 30.78 51 -73.503 0.20 31.94 52 90.956 6.92 1.54814 45.8 32.44 53 -40.757 10.00 32.36 54 ∞ 33.00 1.60859 46.4 60.00 55 ∞ 13.20 1.51633 64.2 60.00 56 ∞ 13.00 60.00 Image plane ∞ Aspherical data Page 13 K =-2.00000e+00 A 4= 3.44369e-06 A 6= 1.75215e-08 A 8= 7.54946e-10 A10= 2.14912e-12 A12=-3.63493e-15 A14=-4.81730e-18 A16=-2.42956e-22 A 3= 2.85376e-07 A 5=-2.62114e-08 A 7=-5.36345e-09 A 9=-5.75280e-11 A11=-2.11882e-15 A13= 1.84793e-16 A15= 6.35958e-20 Page 21 K = 2.00000e+00 A 4= 2.64491e-07 A 6= 1.64486e-10 A 8= 2.81450e-13 A10=-1.53239e-17 A12=-1.64838e-19 A14=-1.42788e-23 A16=-8.46539e-27 A 3=-1.58738e-07 A 5=-1.55150e-09 A 7=-9.40854e-12 A 9=-4.09584e-15 A11= 4.65152e-18 A13= 1.98486e-21 A15= 6.05850e-25 Page 30 K =-2.38519e+02 A 4= 2.47257e-07 A 6= 3.38998e-10 A 8= 4.88176e-14 A10=-2.01015e-16 A12= 2.29490e-19 A14=-2.08445e-22 A16= 2.48948e-26 A 3= 4.99600e-07 A 5=-1.93641e-09 A 7=-1.30855e-11 A 9= 1.12625e-14 A11=-8.21095e-18 A13= 5.19906e-21 A15= 5.36432e-25 Various data Zoom ratio 130.00 Wide-angle, Medium, Telephoto Focal length 7.90 208.08 1026.97 F-number 1.76 1.76 5.34 Half-angle 34.85 1.51 0.31 Image height 5.50 5.50 5.50 Lens length 673.04 673.04 673.04 BF 13.00 13.00 13.00 d12 3.91 170.96 183.51 d19 278.18 77.24 2.00 d25 10.20 3.45 3.75 d30 2.96 43.61 106.00 d56 13.00 13.00 13.00 Entrance pupil position 127.37 2394.75 14430.30 Exit pupil position 232.15 232.15 232.15 Front principal point position 135.56 2800.39 20269.74 Back principal point position 5.10 -195.08 -1013.97 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 233.00 129.14 74.15 -16.84 2 13 -21.53 32.82 2.14 -22.04 3 20 133.90 35.97 -4.30 -27.75 4 26 115.12 24.09 3.23 -12.64 5 31 46.80 142.77 59.82 17.22

[0069] <Numerical Example 3> Unit: mm Surface data Face number rd nd vd Effective diameter 1 -2640.787 6.00 1.83481 42.7 217.94 2 336.021 1.50 205.56 3 333.782 24.22 1.43387 95.1 205.20 4 -982.483 0.20 204.25 5 572.375 14.77 1.43387 95.1 203.94 6 -1669.583 24.51 204.06 7 366.303 19.18 1.43387 95.1 204.59 8 -2715.734 0.25 204.15 9 294.365 18.26 1.43387 95.1 198.83 10 2906.754 1.60 197.76 11 189.946 15.80 1.43387 95.1 184.45 12 408.286 (variable) 182.82 13* -341.785 2.20 2.00330 28.3 42.45 14 34.515 10.27 36.00 15 -46.098 1.45 1.80610 40.9 35.09 16 48.098 11.91 1.89286 20.4 35.96 17 -45.986 1.41 37.56 18 -37.502 2.00 1.83481 42.7 37.56 19 -115.875 (variable) 40.26 20 101.863 12.07 1.76385 48.5 84.37 21* -775.375 3.25 84.15 22 195.252 13.40 1.43875 94.7 83.98 23 -146.652 0.85 83.57 24 253.827 2.50 1.85478 24.8 78.51 25 81.675 (variable) 74.95 26 79.787 14.31 1.49700 81.5 76.40 27 -369.567 2.60 1.84666 23.8 75.63 28 1334.585 0.20 74.64 29* 223.959 9.17 1.53775 74.7 74.08 30 -153.782 (variable) 73.44 31 (aperture) ∞ 2.87 33.68 32 -377.940 1.40 1.88300 40.8 31.89 33 36.203 0.78 30.30 34 30.540 5.35 1.80810 22.8 30.65 35 204.910 3.50 29.95 36 -77.957 1.50 1.88300 40.8 28.99 37 193.909 9.11 28.59 38 -301.472 1.50 1.89190 37.1 27.80 39 39.221 3.85 1.84666 23.8 27.77 40 138.609 5.30 27.79 41 -80.184 1.50 1.88300 40.8 28.44 42 137.813 8.33 1.51742 52.4 29.41 43 -29.801 10.33 30.71 44 59.065 5.04 1.53172 48.8 30.72 45 -116.981 1.40 30.34 46 -68.241 1.50 1.89190 37.1 30.03 47 36.062 7.24 1.48749 70.2 29.98 48 -89.814 0.20 30.65 49 104.175 7.19 1.51633 64.1 31.20 50 -36.575 1.50 1.88300 40.8 31.28 51 -82.065 0.20 31.99 52 78.404 6.28 1.54814 45.8 32.11 53 -52.540 10.00 32.09 54 ∞ 33.00 1.60859 46.4 60.00 55 ∞ 13.20 1.51633 64.2 60.00 56 ∞ 12.99 60.00 Image plane ∞ Aspherical data Page 13 K =-1.98003e+00 A 4= 2.20198e-06 A 6= 2.51518e-08 A 8= 8.03825e-10 A10= 1.57670e-12 A12=-4.66646e-15 A14=-2.78721e-18 A16= 1.80718e-22 A 3= 2.41302e-07 A 5=-3.66593e-08 A 7=-6.34925e-09 A 9=-5.47960e-11 A11= 3.59373e-14 A13= 1.67667e-16 A15= 1.19221e-20 Page 21 K = 7.94738e-01 A 4= 3.90977e-07 A 6=-1.66736e-09 A 8=-7.36421e-12 A10= 6.31669e-15 A12= 1.52958e-17 A14= 2.58533e-21 A16=-3.23171e-28 A 3=-9.36022e-08 A 5= 9.57405e-09 A 7= 1.50044e-10 A 9= 1.28810e-13 A11=-4.88837e-16 A13=-2.68027e-19 A15=-1.07510e-23 Page 29 K =-1.86470e+00 A 4=-1.88288e-07 A 6= 1.02042e-08 A 8= 5.62942e-11 A10= 5.40989e-14 A12= 6.52653e-17 A14= 3.92509e-20 A16= 1.70284e-24 A 3=-5.92818e-07 A 5=-6.42825e-08 A 7=-9.73542e-10 A 9=-2.05372e-12 A11=-1.63236e-15 A13=-2.05465e-18 A15=-4.02843e-22 Various data Zoom ratio 140.00 Wide-angle, Medium, Telephoto Focal length 8.20 260.97 1147.98 F-number 1.77 1.76 5.80 Half-angle 33.85 1.21 0.27 Image height 5.50 5.50 5.50 Lens length 680.06 680.06 680.06 BF 12.99 12.99 12.99 d12 3.67 183.40 195.07 d19 289.44 65.94 2.00 d25 15.11 13.50 2.71 d30 2.90 48.27 111.34 d56 12.99 12.99 12.99 Entrance pupil position 130.21 2865.72 16950.50 Exit pupil position 181.90 181.90 181.90 Front principal point position 138.80 3529.93 25900.81 Back principal point position 4.79 -247.98 -1134.98 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 250.00 126.29 71.99 -19.77 2 13 -22.00 29.24 2.85 -17.70 3 20 134.69 32.07 -9.12 -28.21 4 26 98.91 26.28 6.97 -10.85 5 31 41.99 142.06 56.80 20.82

[0070] <Numerical Example 4> Unit: mm Surface data Face number rd nd vd Effective diameter 1 -1555.043 5.00 1.83481 42.7 214.10 2 353.750 1.50 202.74 3 351.223 24.01 1.43387 95.1 202.15 4 -794.951 0.20 200.89 5 517.913 16.02 1.43387 95.1 201.35 6 -1396.076 23.31 201.45 7 389.370 19.31 1.43387 95.1 202.46 8 -1592.411 0.25 202.12 9 312.362 16.50 1.43387 95.1 197.53 10 2189.440 1.65 196.55 11 178.724 16.99 1.43387 95.1 184.19 12 389.334 (Variable) 182.60 13* -221.493 2.20 2.00330 28.3 45.55 14 41.464 9.65 39.35 15 -63.287 1.45 1.80610 40.9 38.48 16 43.505 11.97 1.89286 20.4 38.69 17 -50.745 3.45 38.60 18 -39.588 2.00 1.83481 42.7 35.67 19 -377.493 (variable) 35.90 20 121.892 10.03 1.76385 48.5 82.90 21* -726.216 (variable) 82.81 22 113.831 16.58 1.43875 94.7 83.01 23 -155.147 0.68 82.30 24 189.566 2.20 1.85025 30.1 76.16 25 67.579 4.50 1.48749 70.2 71.71 26 84.449 (Variable) 71.00 27 91.763 12.23 1.49700 81.5 70.35 28 -492.764 2.20 1.84666 23.8 69.05 29 735.845 0.15 68.08 30* 206.961 7.67 1.53775 74.7 67.46 31 -207.052 (variable) 66.66 32 (aperture) ∞ 4.46 35.77 33 -225.885 1.40 1.88300 40.8 33.05 34 38.662 0.88 31.53 35 33.392 4.14 1.80810 22.8 31.94 36 74.832 4.95 31.35 37 -69.438 1.50 1.88300 40.8 30.92 38 -113.828 7.51 31.08 39 -98.347 1.50 1.89190 37.1 30.28 40 69.830 5.65 1.84666 23.8 30.68 41 -132.325 1.10 30.99 42 -237.028 1.50 1.88300 40.8 30.97 43 55.024 13.41 1.51742 52.4 31.21 44 -48.886 7.46 33.02 45 188.178 4.26 1.53172 48.8 32.60 46 -86.116 1.40 32.43 47 -55.004 1.50 1.89190 37.1 32.25 48 136.879 7.29 1.48749 70.2 32.81 49 -38.771 0.20 33.35 50 97.451 7.09 1.51633 64.1 32.58 51 -42.844 1.50 1.88300 40.8 32.04 52 -230.030 0.20 32.01 53 93.901 5.11 1.54814 45.8 31.72 54 -76.659 10.00 31.27 55 ∞ 33.00 1.60859 46.4 60.00 56 ∞ 13.20 1.51633 64.2 60.00 57 ∞ 12.90 60.00 Image plane ∞ Aspherical data Page 13 K = 2.57263e-02 A 4= 2.06021e-06 A 6= 2.95254e-08 A 8= 8.51538e-10 A10= 3.03005e-12 A12=-4.03732e-15 A14=-3.74363e-18 A16= 5.40859e-22 A 3=-1.28433e-07 A 5=-8.75942e-08 A 7=-6.44264e-09 A 9=-6.86019e-11 A11=-2.96767e-14 A13= 2.11032e-16 A15=-6.68244e-22 Page 21 K =-1.16140e+00 A 4= 4.16737e-07 A 6= 3.33199e-10 A 8= 2.60425e-13 A10=-6.05661e-18 A12=-1.66061e-19 A14=-1.22475e-23 A16=-3.80232e-27 A 3=-2.58118e-07 A 5=-6.24072e-09 A 7=-1.08703e-11 A 9=-5.03203e-15 A11= 5.50700e-18 A13= 1.82229e-21 A15= 3.22254e-25 Page 30 K = 1.90377e+00 A 4= 4.01683e-08 A 6= 1.21219e-08 A 8= 5.42643e-11 A10=-5.92002e-15 A12= 3.32588e-18 A14= 3.39734e-20 A16= 1.89067e-24 A 3=-7.63348e-07 A 5=-7.89396e-08 A 7=-1.08224e-09 A 9=-1.26694e-12 A11= 8.61788e-16 A13=-1.18177e-18 A15=-4.13522e-22 Various data Zoom ratio 160.00 Wide-angle, Medium, Telephoto Focal length 8.50 210.60 1359.98 F-number 1.77 1.76 7.00 Half-angle 32.91 1.50 0.23 Image height 5.50 5.50 5.50 Lens length 681.11 681.11 681.11 BF 12.90 12.90 12.90 d12 4.27 175.40 188.47 d19 297.58 94.87 2.00 d21 6.63 4.69 1.46 d26 4.79 4.05 3.64 d31 3.03 37.29 120.75 d57 12.90 12.90 12.90 Entrance pupil position 132.87 2525.33 21522.41 Exit pupil position 573.56 573.56 573.56 Front principal point position 141.50 2815.04 26181.25 Back principal point position 4.40 -197.70 -1347.08 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 243.98 124.75 70.39 -19.87 2 13 -22.00 30.71 4.71 -15.27 3 20 136.68 10.03 0.82 -4.88 4 22 2306.66 23.96 -181.00 -182.88 5 27 117.56 22.25 5.37 -9.52 6 32 55.43 140.21 61.65 23.46

[0071] <Numerical Example 5> Unit: mm Surface data Face number rd nd vd Effective diameter 1 -2101.929 6.00 1.83481 42.7 218.34 2 342.328 1.50 205.58 3 340.607 24.50 1.43387 95.1 204.94 4 -875.684 0.20 203.59 5 560.163 14.62 1.43387 95.1 198.75 6 -1533.335 24.57 198.85 7 377.116 17.19 1.43387 95.1 199.03 8 -4384.450 0.25 198.59 9 293.129 18.00 1.43387 95.1 194.06 10 3866.415 1.60 193.03 11 190.528 15.23 1.43387 95.1 180.54 12 412.617 (variable) 178.94 13* -535.729 2.20 2.00330 28.3 44.50 14 32.743 10.74 37.34 15 -53.839 1.45 1.80610 40.9 36.62 16 43.546 11.58 1.89286 20.4 37.52 17 -54.689 (variable) 37.71 18 -41.384 2.50 1.80518 25.4 36.31 19 -37.207 1.50 1.83481 42.7 37.11 20* -118.415 (variable) 39.36 21 118.835 11.27 1.78800 47.4 82.81 22* -1393.025 3.88 82.66 23 119.092 16.81 1.43875 94.7 83.12 24 -151.232 0.50 82.42 25 174.513 2.50 1.85478 24.8 76.46 26 73.619 (variable) 72.46 27 83.987 14.33 1.49700 81.5 72.35 28 -287.336 2.60 1.84666 23.8 71.08 29 -7693.666 0.20 70.10 30* 307.100 6.85 1.53775 74.7 69.38 31 -215.218 (variable) 68.61 32 (aperture) ∞ 2.61 34.92 33 -1437.318 1.40 1.88300 40.8 33.21 34 38.725 0.77 31.58 35 32.559 5.07 1.80810 22.8 31.80 36 99.727 4.62 30.93 37 -63.305 1.50 1.88300 40.8 30.15 38 -315.783 8.22 30.11 39 -173.845 1.50 1.89190 37.1 29.23 40 42.468 4.87 1.84666 23.8 29.34 41 -447.471 2.98 29.42 42 -67.619 1.50 1.88300 40.8 29.44 43 86.019 10.10 1.51742 52.4 30.42 44 -31.109 9.67 31.99 45 63.074 4.92 1.53172 48.8 31.21 46 -127.855 1.40 30.79 47 -77.173 1.50 1.89190 37.1 30.41 48 34.257 7.50 1.48749 70.2 30.14 49 -87.239 0.20 30.73 50 127.064 7.31 1.51633 64.1 31.12 51 -33.484 1.50 1.88300 40.8 31.16 52 -84.848 0.20 31.99 53 82.918 6.46 1.54814 45.8 32.21 54 -48.094 10.00 32.00 55 ∞ 33.00 1.60859 46.4 60.00 56 ∞ 13.20 1.51633 64.2 60.00 57 ∞ 12.99 60.00 Image plane ∞ Aspherical data Page 13 K = 3.58921e-01 A 4= 1.88098e-06 A 6= 2.39834e-08 A 8= 7.59027e-10 A10= 2.14113e-12 A12=-3.65983e-15 A14=-4.82700e-18 A16=-3.60162e-22 A 3=-1.47106e-07 A 5=-4.52292e-08 A 7=-5.85496e-09 A 9=-5.62715e-11 A11=-4.81713e-15 A13= 1.89219e-16 A15= 6.51550e-20 Page 20 K = 0.00000e+00 A 4=-2.38299e-07 A 6=-1.23927e-11 A 8=-7.52279e-14 Page 22 K = 2.00000e+00 A 4= 3.49606e-07 A 6= 2.24134e-10 A 8= 3.17632e-13 A10=-5.86994e-17 A12=-1.49856e-19 A14=-1.31141e-23 A16=-5.48418e-27 A 3=-9.98745e-08 A 5=-2.69982e-09 A 7=-1.11064e-11 A 9=-4.22950e-15 A11= 5.60505e-18 A13= 1.58601e-21 A15= 4.49484e-25 Page 30 K =-2.00000e+00 A 4= 7.24426e-08 A 6= 1.28878e-08 A 8= 5.47702e-11 A10=-6.17749e-15 A12= 2.87589e-18 A14= 3.38425e-20 A16= 1.96588e-24 A 3=-6.71400e-07 A 5=-8.77572e-08 A 7=-1.11210e-09 A 9=-1.26532e-12 A11= 8.72399e-16 A13=-1.16818e-18 A15=-4.17308e-22 Various data Zoom ratio 140.00 Wide-angle, Medium, Telephoto Focal length 8.00 221.43 1119.99 F-number 1.77 1.77 5.82 Half-angle 34.51 1.42 0.28 Image height 5.50 5.50 5.50 Lens length 682.98 682.98 682.98 BF 12.99 12.99 12.99 d12 3.49 184.35 197.45 d17 3.19 3.03 3.99 d20 297.48 83.42 2.00 d26 8.29 4.01 10.54 d31 3.00 40.65 101.47 d57 12.99 12.99 12.99 Entrance pupil position 128.08 2647.44 16280.31 Exit pupil position 258.47 258.47 258.47 Front principal point position 136.34 3068.60 22510.09 Back principal point position 4.99 -208.44 -1107.00 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 250.49 123.64 71.44 -18.42 2 13 -45.13 25.97 -6.66 -31.75 3 18 -77.05 4.00 -1.12 -3.37 4 21 127.59 34.96 -7.27 -28.50 5 27 113.84 23.98 5.47 -10.63 6 32 47.88 141.99 59.92 20.37

[0072] <Numerical Example 6> Unit: mm Surface data Face number rd nd vd Effective diameter 1 -1979.490 6.00 1.83481 42.7 216.00 2 356.735 1.60 203.78 3 355.588 24.20 1.43387 95.1 203.09 4 -773.722 0.20 201.73 5 556.581 14.23 1.43387 95.1 198.42 6 -1751.765 24.14 198.49 7 403.411 15.77 1.43387 95.1 198.20 8 -6837.871 0.25 197.78 9 286.795 18.64 1.43387 95.1 193.51 10 5493.466 1.60 192.50 11 190.061 15.47 1.43387 95.1 179.87 12 424.696 (variable) 178.28 13* 487.277 1.80 1.90366 31.3 44.35 14 43.289 7.54 38.60 15 -128.946 1.80 1.88300 40.8 36.92 16 43.897 4.92 1.43875 94.7 34.69 17 110.906 4.45 34.23 18 -54.799 1.80 1.90525 35.0 34.18 19 87.973 5.16 1.89286 20.4 37.20 20 -117.643 0.14 38.22 21 267.405 8.16 1.80518 25.4 40.56 22 -39.052 1.82 1.80400 46.5 41.18 23 -289.280 (Variable) 43.96 24 266.014 13.34 1.49700 81.5 86.51 25* -128.569 0.20 87.24 26 231.088 11.04 1.43875 94.7 88.47 27 -242.563 2.52 1.59270 35.3 88.35 28 401.146 (Variable) 88.30 29 118.659 13.66 1.43875 94.7 89.53 30 -347.072 0.12 89.20 31* 417.397 4.97 1.43875 94.7 87.72 32 -485.991 0.23 87.28 33 443.462 2.41 1.85025 30.1 85.40 34 136.534 14.00 1.43875 94.7 83.17 35 -175.018 (Variable) 82.56 36 (Aperture) ∞ 5.74 40.56 37 -132.613 1.30 1.80100 35.0 37.96 38 78.613 0.12 37.07 39 44.330 4.61 1.84666 23.8 37.19 40 164.209 2.50 36.60 41 -130.313 1.30 1.64000 60.1 36.50 42 103.456 8.00 35.69 43 -446.160 2.45 1.80100 35.0 35.11 44 49.371 16.95 1.80518 25.4 35.00 45 -57.577 1.65 34.78 46 -39.653 1.80 1.77250 49.6 34.55 47 41.027 8.70 1.53172 48.8 35.72 48 -55.585 0.12 36.20 49 -242.138 3.16 1.56732 42.8 36.45 50 -91.852 8.51 36.69 51 -59.298 4.28 1.54814 45.8 36.36 52 -33.892 0.58 36.70 53 -100.095 9.19 2.00069 25.5 34.77 54 55.943 1.22 34.38 55 49.611 11.26 1.53172 48.8 35.58 56 -45.485 0.12 36.07 57 55.692 7.68 1.59551 39.2 34.16 58 -40.526 2.10 2.00069 25.5 33.59 59 -113.434 13.00 33.00 60 ∞ 33.00 1.60859 46.4 60.00 61 ∞ 13.20 1.51633 64.2 60.00 62 ∞ 13.25 60.00 Image plane ∞ Aspherical data Page 13 K = 0.00000e+00 A 4= 1.71364e-07 A 6=-4.86825e-08 A 8=-8.88400e-10 A10=-2.96153e-12 A12=-4.72336e-15 A14= 2.75739e-18 A16= 1.70315e-21 A 3= 1.87120e-07 A 5= 1.38289e-07 A 7= 8.66794e-09 A 9= 5.88775e-11 A11= 1.33121e-13 A13= 6.57385e-17 A15=-1.34271e-19 Page 25 K = 0.00000e+00 A 4= 1.74550e-07 A 6=-4.97174e-10 A 8=-3.23403e-12 A10=-2.49644e-15 A12= 5.29486e-19 A14= 2.55506e-22 A16=-2.59288e-26 A 3=-5.72878e-07 A 5=-1.20232e-09 A 7= 5.78346e-11 A 9= 1.11014e-13 A11= 2.65894e-17 A13=-2.41331e-20 A15= 1.14297e-24 Page 31 K = 0.00000e+00 A 4=-1.48026e-07 A 6= 1.53986e-10 A 8=-2.35867e-12 A10=-1.18763e-15 A12= 4.70615e-19 A14=-1.15016e-22 A16=-2.67386e-26 A 3=-8.82590e-07 A 5=-9.69861e-09 A 7= 2.75235e-11 A 9= 8.16021e-14 A11=-5.17598e-18 A13=-4.78599e-21 A15= 3.49613e-24 Various data Zoom ratio 144.44 Wide angle, intermediate, telephoto Focal length 8.10 251.82 1169.94 F-number 1.76 1.77 6.08 Half angle of view 34.18 1.25 0.27 Image height 5.50 5.50 5.50 Overall lens length 715.83 715.83 715.83 BF 13.25 13.25 13.25 d12 2.70 180.00 194.11 d23 301.19 73.33 1.50 d28 11.02 2.65 1.50 d35 2.98 61.91 120.78 d62 13.25 13.25 13.25 Entrance pupil position 128.50 2659.69 16159.86 Exit pupil position 508.91 508.91 508.91 Front principal point position 136.73 3039.45 20091.29 Rear principal point position 5.15 -238.57 -1156.69 Zoom lens group data Group, starting surface, focal length, lens construction length, front principal point position, rear principal point position 1 1 248.34 122.09 69.94 -19.01 2 13 -22.50 37.58 4.34 -23.27 3 24 178.58 27.10 2.62 -15.49 4 29 125.39 35.38 9.48 -15.69 5 36 63.45 162.54 72.79 14.14

[0073] <Numerical Example 7> Unit: mm Surface data Face number rd nd vd Effective diameter 1 -2209.695 6.00 1.83481 42.7 218.26 2 341.889 1.50 205.58 3 339.919 24.40 1.43387 95.1 204.95 4 -889.124 0.20 203.62 5 559.308 14.37 1.43387 95.1 198.48 6 -1638.781 24.63 198.58 7 382.453 17.03 1.43387 95.1 198.80 8 -4097.047 0.25 198.38 9 294.905 18.08 1.43387 95.1 193.93 10 4765.116 1.60 192.91 11 191.673 15.16 1.43387 95.1 181.00 12 419.037 (variable) 179.59 13* -289.959 2.20 2.00330 28.3 45.81 14 37.660 10.53 38.99 15 -55.227 1.45 1.80610 40.9 38.11 16 45.332 6.03 1.89286 20.4 38.72 17 -840.505 (variable) 38.75 18 -526.771 5.06 1.89286 20.4 38.74 19 -49.365 3.33 38.78 20 -38.563 2.00 1.83481 42.7 36.79 21 -141.380 (variable) 39.10 22 120.942 10.34 1.78800 47.4 83.55 23* -694.900 2.79 83.45 24 121.227 16.19 1.43875 94.7 83.53 25 -150.560 0.48 82.90 26 179.392 2.50 1.85478 24.8 76.56 27 74.396 (Variable) 72.46 28 90.094 13.43 1.49700 81.5 72.06 29 -300.995 2.60 1.84666 23.8 70.84 30 6830.305 0.20 69.83 31* 290.609 6.90 1.53775 74.7 69.12 32 -225.074 (variable) 68.34 33 (aperture) ∞ 3.22 35.10 34 -1087.040 1.40 1.88300 40.8 33.00 35 41.815 0.71 31.48 36 34.073 4.37 1.80810 22.8 31.61 37 95.174 4.66 30.90 38 -63.843 1.50 1.88300 40.8 30.14 39 -203.028 8.14 30.10 40 -128.165 1.50 1.89190 37.1 28.89 41 42.391 5.22 1.84666 23.8 29.02 42 -164.006 3.28 29.11 43 -44.925 1.50 1.88300 40.8 29.01 44 133.399 8.33 1.51742 52.4 30.34 45 -29.390 10.79 31.52 46 82.663 4.80 1.53172 48.8 31.35 47 -94.767 1.40 31.06 48 -89.200 1.50 1.89190 37.1 30.51 49 34.307 8.58 1.48749 70.2 30.24 50 -69.136 0.20 30.98 51 125.204 7.61 1.51633 64.1 31.30 52 -32.816 1.50 1.88300 40.8 31.26 53 -93.692 0.20 32.06 54 89.512 6.60 1.54814 45.8 32.25 55 -46.999 10.00 32.05 56 ∞ 33.00 1.60859 46.4 60.00 57 ∞ 13.20 1.51633 64.2 60.00 58 ∞ 13.00 60.00 Image plane ∞ Aspherical data Page 13 K =-1.15600e+00 A 4= 2.06167e-06 A 6= 2.37163e-08 A 8= 7.71464e-10 A10= 2.13881e-12 A12=-3.64738e-15 A14=-4.78375e-18 A16=-3.39020e-22 A 3= 2.47197e-07 A 5=-3.95002e-08 A 7=-5.93337e-09 A 9=-5.68527e-11 A11=-4.22622e-15 A13= 1.87969e-16 A15= 6.37161e-20 Page 23 K =-1.99999e+00 A 4= 3.67612e-07 A 6= 2.05049e-10 A 8= 2.53553e-13 A10=-2.49940e-17 A12=-1.58306e-19 A14=-1.48454e-23 A16=-5.38308e-27 A 3=-1.09998e-07 A 5=-2.77004e-09 A 7=-9.40643e-12 A 9=-3.75874e-15 A11= 4.92123e-18 A13= 1.91359e-21 A15= 4.34738e-25 Page 31 K =-1.30139e+00 A 4= 1.82753e-07 A 6= 1.28586e-08 A 8= 5.44389e-11 A10=-6.62904e-15 A12= 3.45636e-18 A14= 3.39906e-20 A16= 1.94990e-24 A 3=-9.50776e-07 A 5=-8.91812e-08 A 7=-1.10762e-09 A 9=-1.24702e-12 A11= 8.66524e-16 A13=-1.18162e-18 A15=-4.17343e-22 Various data Zoom ratio 144.43 Wide-angle, Medium, Telephoto Focal length 8.10 219.95 1169.92 F-number 1.76 1.76 6.08 Half-angle 34.18 1.43 0.27 Image height 5.50 5.50 5.50 Lens length 681.21 681.21 681.21 BF 13.00 13.00 13.00 d12 3.85 183.66 196.76 d17 0.99 1.95 2.02 d21 299.35 86.05 2.99 d27 8.67 3.73 6.93 d32 2.88 40.36 107.05 d58 13.00 13.00 13.00 Entrance pupil position 129.68 2617.63 17135.57 Exit pupil position 223.58 223.58 223.58 Front principal point position 138.09 3067.31 24805.18 Back principal point position 4.90 -206.95 -1156.92 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 250.77 123.22 71.35 -18.31 2 13 -21.98 20.21 3.53 -11.30 3 18 600.00 10.40 -22.01 -27.99 4 22 121.73 32.30 -6.44 -25.95 5 28 121.42 23.12 5.31 -10.16 6 33 46.53 143.21 60.30 19.95

[0074] [Table 1] [Explanation of symbols]

[0075] L1 First lens group L2 Second lens group L3 Third lens group L4 4th lens group L5 5th lens group SP aperture diaphragm

Claims

1. A zoom lens comprising, in order from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, a first intermediate group consisting of one or two lens groups with negative refractive power that move toward the image side when zooming from the wide-angle end to the telephoto end, a second intermediate group consisting of at least two lens groups with positive refractive power that move toward the object side when zooming from the wide-angle end to the telephoto end, and a lens group positioned furthest toward the image side that does not move for zooming, When zooming, the spacing between adjacent lens groups changes. In zooming from the wide-angle end to the telephoto end, the lens group with the largest amount of movement among the first intermediate group is designated as the Nth lens group, and the lens group with the largest amount of movement among the second intermediate group is designated as the Pth lens group. When the focal length of the first lens group is f1, the focal length of the zoom lens at the wide-angle end is fw, the focal length of the zoom lens at the telephoto end is ft, the difference between the distance along the optical axis from the N lens group to the image plane at the wide-angle end and the distance along the optical axis from the N lens group to the image plane at the telephoto end is mn, the difference between the distance along the optical axis from the P lens group to the image plane at the wide-angle end and the distance along the optical axis from the P lens group to the image plane at the telephoto end is mp, and the combined focal length of the first intermediate group at the wide-angle end is fvw, 4.35<ft / f1<6.00 1.0<|mn / mp|<2.0 0.02<fw / f1<0.05 -15.0<f1 / fvw≦-10.822 A zoom lens characterized by satisfying the following condition.

2. When the combined horizontal magnification of the first intermediate group at the wide-angle end is βvw and the combined horizontal magnification of the first intermediate group at the telephoto end is βvt, 2.0<(βvt / βvw)2×(fw / ft)<5.0 The zoom lens according to claim 1, characterized in that it satisfies the following condition.

3. The first intermediate group has a state in which the combined horizontal magnification is -1 times, When the combined horizontal magnification of the second intermediate group is βcfz in a state where the combined horizontal magnification of the first intermediate group is -1, -1.00<βcfz<-0.65 The zoom lens according to claim 2, characterized in that it satisfies the following condition.

4. The first intermediate group has a state in which the combined horizontal magnification is -1 times, The zoom lens according to claim 2, characterized in that the combined horizontal magnification of the second intermediate group is -1 when the combined horizontal magnification of the first intermediate group is -1.

5. The second intermediate group consists of a P1 lens group with positive refractive power and a P2 lens group with positive refractive power, and when the distance between adjacent surfaces of the P1 lens group and the P2 lens group on the optical axis at the wide-angle end is dw, and the distance between adjacent surfaces of the P1 lens group and the P2 lens group on the optical axis at the telephoto end is dt, 0.1<dt / dw<2.0 The zoom lens according to claim 3, characterized in that it satisfies the following condition.

6. When the combined focal length of the first intermediate group at the wide-angle end is fvw and the combined focal length of the second intermediate group at the wide-angle end is fcw, -0.50<fvw / fcw<-0.15 A zoom lens according to any one of items 1 to 5, characterized in that it satisfies the following condition.

7. The zoom lens according to any one of claims 1 to 6, characterized in that the lens closest to the object in the first lens group is a biconcave lens.

8. When the focal length of the biconcave lens is f1n and the d-line reference Abbe number of the biconcave lens is ν1n, -1.65<f1n / f1<-1.10 37 < ν1n < 48 The zoom lens according to claim 7, characterized in that it satisfies the following condition.

9. When νpave is the average of the d-line reference Abbe numbers of the positive lenses included in the first lens group, 80<νpave<100 A zoom lens according to any one of items 1 to 8, characterized in that it satisfies the following condition.

10. 125<ft / fw<200 A zoom lens according to any one of items 1 to 9, characterized in that it satisfies the following condition.

11. An imaging device characterized by having a zoom lens according to any one of claims 1 to 10 and an image sensor for capturing an image formed by the zoom lens.

Images