Zoom lens and image pickup apparatus

Abstract

The present application provides a zoom lens which ensures a wide angle of view and a high zoom ratio while realizing miniaturization and having good optical performance, and an image pickup apparatus provided with the zoom lens. The zoom lens of the present application has only a positive first lens group, a negative second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group as lens groups in this order from the object side. An aperture stop is disposed between the most image-side lens surface of the second lens group and the most object-side lens surface of the fourth lens group. At least the first lens group, the second lens group, the third lens group, and the fourth lens group move at the time of zooming. The first lens group includes a negative lens, a positive lens, and a positive lens in this order from the object side. The zoom lens of the present application satisfies a predetermined conditional expression.

Description

[0001] This application is a divisional application of application number "201911152316.1", filed on November 20, 2019, entitled "Zoom Lens and Camera Device". Technical Field

[0002] This invention relates to a zoom lens and a camera device. Background Technology

[0003] Conventionally, zoom lenses suitable for digital cameras and the like have been known to include, from the object side, five lens groups in a structure: a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power. For example, Patent Documents 1 and 2 described below describe a zoom lens having the above-described structure.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2017-156426

[0005] Patent Document 2: Japanese Patent Application Publication No. 2017-053889

[0006] Zoom lenses with the aforementioned structure are typically used in so-called standard zoom lenses that can handle the wide-angle to standard and even medium telephoto ranges. In recent years, there has been an increasing demand for wide angles of view at the wide-angle end and for a smaller overall optical system while ensuring high optical performance. Furthermore, even with a wider angle of view at the wide-angle end, a high zoom ratio is required to ensure a long focal length at the telephoto end.

[0007] However, in the zoom lenses of Embodiments 1 and 2 described in Patent Document 1, the total optical length at the wide-angle end relative to the maximum image height is long. In the zoom lens of Embodiment 3 described in Patent Document 1, the first lens group has a two-element structure, which cannot be said to provide a sufficiently wide angle of view at the wide-angle end, and the total optical length at the wide-angle end relative to the maximum image height is long. In the zoom lenses of Embodiments 4 to 8 described in Patent Document 1, the first lens group consists of a single element, making it difficult to correct spherical aberration and on-axis chromatic aberration at the telephoto end, thus failing to ensure a high zoom ratio. Most of the zoom lenses described in Patent Document 2 have a long back focal length, resulting in a long overall optical length. Summary of the Invention

[0008] The present invention was made in view of the above circumstances, and its object is to provide a zoom lens that achieves miniaturization and good optical performance while ensuring a wide field of view and a high zoom ratio, and a camera device equipped with the zoom lens.

[0009] One aspect of the present invention relates to a zoom lens comprising only five lens groups arranged sequentially from the object side toward the image side: a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power. An aperture diaphragm is disposed between the lens surface of the second lens group closest to the image side and the lens surface of the fourth lens group closest to the object side. During zooming, the spacing between all adjacent lens groups in the optical axis direction is changed. When at least the first lens group, the second lens group, the third lens group, and the fourth lens group are moved along the optical axis, the first lens group includes, from the object side to the image side, a first lens with negative refractive power, a second lens with positive refractive power, and a third lens with positive refractive power. When the focal length of the first lens group is set to f1, the focal length of the fifth lens group is set to f5, the focal length of the fourth lens group is set to f4, and the refractive index of the second lens relative to the d line is set to Nd2, the following conditions (1), (2), and (3) are satisfied.

[0010] 0.4 < f1 / f5 < 2 (1)

[0011] -0.7 < f4 / f5 < -0.1 (2)

[0012] 1.6 < Nd2 < 2 (3)

[0013] In the zoom lens described above, when the back focal length in air-equivalent distance is set to BFw when the wide-angle end is focused on an object at infinity, and the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image and the back focal length in air-equivalent distance is set to TLw when the wide-angle end is focused on an object at infinity, the following condition (4) is preferably satisfied.

[0014] 0.07 < BFw / TLw < 0.25 (4)

[0015] In the zoom lens described above, preferably the entire third lens group or a part of the third lens group is moved in a direction intersecting the optical axis in order to correct image jitter.

[0016] In the zoom lens described above, the third lens group is preferably configured to include, from the object side toward the image side, a front group of the third lens group with positive refractive power and a rear group of the third lens group with positive refractive power, with only the rear group of the third lens group moving in a direction intersecting the optical axis to correct image jitter. In this structure, the front group of the third lens group preferably includes two positive lenses and one negative lens. Furthermore, in this structure, when the focal length of the rear group of the third lens group is set to f3R, the focal length of the front group of the third lens group is set to f3F, the lateral magnification of the rear group of the third lens group when focusing on an object at infinity at the telephoto end is set to β3Rt, the combined lateral magnification of the fourth and fifth lens groups when focusing on an object at infinity at the telephoto end is set to β45t, and the dispersion coefficient of the d-line reference of at least one positive lens of the rear group of the third lens group is set to v d3Rp, at least one of the following conditional equations (5), (6), and (7) is preferably satisfied.

[0017] 0.1 < f3R / f3F < 0.9 (5)

[0018] 2<(1-β3Rt)×β45t<5 (6)

[0019] 65<νd3Rp<105 (7)

[0020] In the zoom lens described above, when focusing from an object at infinity to a closer object, it can be configured such that only the fourth lens group moves along the optical axis. In this configuration, when the lateral magnification of the fourth lens group is set to β4t when focusing on an object at infinity at the telephoto end, and the lateral magnification of the fifth lens group is set to β5t when focusing on an object at infinity at the telephoto end, the following conditional expression (8) is preferably satisfied.

[0021] -7<(1-β4t 2 )×β5t 2 <-2.6 (8)

[0022] In the zoom lens described above, the fourth lens group can be configured to include one positive lens and one negative lens. In this configuration, when the d-line reference dispersion coefficient of the negative lens of the fourth lens group is set to vd4n and the d-line reference dispersion coefficient of the positive lens of the fourth lens group is set to vd4p, the following condition (9) is preferably satisfied.

[0023] 5<vd4n-v d4p<26 (9)

[0024] In the zoom lens described above, when the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image, which is in the state of focusing on an object at infinity at the wide-angle end, is TLw and the back focal length is measured in terms of air-equivalent distance, and the maximum image height is Y, it is preferable to satisfy the following condition (10).

[0025] 6 < TLw / |Y| < 8.6 (10)

[0026] In the zoom lens described above, when the optical axis spacing between the fourth and fifth lens groups is set to D45t when the telephoto end is focused on an object at infinity, and the optical axis spacing between the fourth and fifth lens groups is set to D45w when the wide-angle end is focused on an object at infinity, the following condition (11) is preferably satisfied.

[0027] 2<D45t / D45w<13 (11)

[0028] In the zoom lens described above, when the back focal length in air-to-ground distance is set to BFw when the wide-angle end is focused on an object at infinity, the focal length of the zoom lens when the wide-angle end is focused on an object at infinity is set to fw, and the maximum half angle of view when the wide-angle end is focused on an object at infinity is set to ωw, it is preferable to satisfy the following condition (12).

[0029] 0.5<BFw / (fw×tan|ωw|)<1.6 (12)

[0030] In the zoom lens described above, when the average value of the refractive index of the second lens relative to the d-line and the refractive index of the third lens relative to the d-line is set to NdG1p, it is preferable to satisfy the following conditional expression (13).

[0031] 1.63 < NdG1p < 1.9 (13)

[0032] In the zoom lens described above, when the focal length of the second lens group is set to f2 and the focal length of the third lens group is set to f3, it is preferable to satisfy the following condition (14).

[0033] -1.3 < f2 / f3 < -0.4 (14)

[0034] In the zoom lens described above, the fifth lens group preferably includes two positive lenses and one negative lens.

[0035] Another aspect of the present invention relates to a camera device having a zoom lens as described above.

[0036] In addition, the terms "including" and "including" in this specification mean that, in addition to the constituent elements listed, it may also include: lenses that do not substantially have refractive power; optical elements other than lenses such as apertures, filters, and cover glass; and mechanism parts such as lens flanges, lens barrels, imaging elements, and hand shaking correction mechanisms.

[0037] Furthermore, in this specification, "a group with positive refractive power" means that the group as a whole has positive refractive power. Similarly, "a group with negative refractive power" means that the group as a whole has negative refractive power. "A lens with positive refractive power" has the same meaning as "positive lens." "A lens with negative refractive power" has the same meaning as "negative lens." "A lens group" is not limited to a structure that includes multiple lenses; it can also be a structure that includes only one lens.

[0038] "Single lens" refers to a single, unbonded lens. However, a compound aspherical lens (comprising a spherical lens and an aspherical layer bonded to at least one of the object-side and image-side surfaces of the spherical lens, and functioning as a single aspherical lens as a whole) is treated as a single lens and not considered a bonded lens. Unless otherwise specified, the refractive power symbol and the surface shape of the lens surface associated with lenses including aspherical surfaces are assumed to be considered in the paraxial region.

[0039] In this specification, the "focal length" used in the conditional expressions is the paraxial focal length. The "back focal length in air equivalent distance" is the air equivalent distance along the optical axis from the lens surface closest to the image side to the focal point on the image side. The "total optical length" is the sum of the distance along the optical axis from the lens surface closest to the object side to the lens surface closest to the image side and the back focal length in air equivalent distance. The values ​​used in the conditional expressions are based on the d-line. When the refractive indices of a lens relative to the g-line, F-line, and C-line are set to Ng, NF, and NC, respectively, the partial dispersion ratio θgF between the g-line and F-line of the lens is defined by θgF = (Ng - NF) / (NF - NC). The “d-line”, “C-line”, “F-line” and “g-line” mentioned in this specification are bright lines. The wavelength of the d-line is 587.56 nm, the wavelength of the C-line is 656.27 nm, the wavelength of the F-line is 486.13 nm, and the wavelength of the g-line is 435.84 nm.

[0040] Invention Effects

[0041] According to the present invention, a zoom lens that ensures a wide field of view and a high zoom ratio while achieving miniaturization and good optical performance, and a camera device equipped with the zoom lens, can be provided. Attached Figure Description

[0042] Figure 1Corresponding to the zoom lens of Embodiment 1 of the present invention, this is a cross-sectional view showing the structure of a zoom lens according to an embodiment of the present invention.

[0043] Figure 2 This is a cross-sectional view showing the structure of the zoom lens according to Embodiment 2 of the present invention.

[0044] Figure 3 This is a cross-sectional view showing the structure of the zoom lens according to Embodiment 3 of the present invention.

[0045] Figure 4 This is a cross-sectional view showing the structure of the zoom lens of Embodiment 4 of the present invention.

[0046] Figure 5 This is a cross-sectional view showing the structure of the zoom lens of Embodiment 5 of the present invention.

[0047] Figure 6 This is a cross-sectional view showing the structure of the zoom lens according to Embodiment 6 of the present invention.

[0048] Figure 7 This is a cross-sectional view showing the structure of the zoom lens according to Embodiment 7 of the present invention.

[0049] Figure 8 This is a cross-sectional view showing the structure of the zoom lens of Embodiment 8 of the present invention.

[0050] Figure 9 This is a cross-sectional view showing the structure of the zoom lens of Embodiment 9 of the present invention.

[0051] Figure 10 This is a cross-sectional view showing the structure of the zoom lens of Embodiment 10 of the present invention.

[0052] Figure 11 This is a cross-sectional view showing the structure of the zoom lens of Embodiment 11 of the present invention.

[0053] Figure 12 This is a cross-sectional view showing the structure and beam of the zoom lens of Embodiment 1 of the present invention.

[0054] Figure 13 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens in Embodiment 1 of the present invention.

[0055] Figure 14 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens in Embodiment 2 of the present invention.

[0056] Figure 15 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens in Embodiment 3 of the present invention.

[0057] Figure 16 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens in Embodiment 4 of the present invention.

[0058] Figure 17 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens in Embodiment 5 of the present invention.

[0059] Figure 18 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens in Embodiment 6 of the present invention.

[0060] Figure 19 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens in Embodiment 7 of the present invention.

[0061] Figure 20 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens in Embodiment 8 of the present invention.

[0062] Figure 21 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens of Embodiment 9 of the present invention.

[0063] Figure 22 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens of Embodiment 10 of the present invention.

[0064] Figure 23 These are the spherical aberration diagram, astigmatism diagram, distortion aberration diagram, and magnification chromatic aberration diagram of the zoom lens of Embodiment 11 of the present invention.

[0065] Figure 24 These are the lateral aberration diagrams of the zoom lens in Embodiment 1 of the present invention during image shake correction and during image shake correction.

[0066] Figure 25 These are the lateral aberration diagrams of the zoom lens in Embodiment 2 of the present invention during image shake correction and during image shake correction.

[0067] Figure 26 These are the lateral aberration diagrams of the zoom lens in Embodiment 3 of the present invention during image shake correction and during image shake correction.

[0068] Figure 27 These are the lateral aberration diagrams of the zoom lens in Embodiment 4 of the present invention during image shake correction and during image shake correction.

[0069] Figure 28 These are the lateral aberration diagrams of the zoom lens in Embodiment 5 of the present invention during image shake correction and during image shake correction.

[0070] Figure 29 These are the lateral aberration diagrams of the zoom lens in Embodiment 6 of the present invention during image shake correction and during image shake correction.

[0071] Figure 30 These are the lateral aberration diagrams of the zoom lens in Embodiment 7 of the present invention during image shake correction and during image shake correction.

[0072] Figure 31 These are the lateral aberration diagrams of the zoom lens in Embodiment 8 of the present invention during image shake correction and during image shake correction.

[0073] Figure 32 These are the lateral aberration diagrams of the zoom lens in Embodiment 9 of the present invention during image shake correction and during image shake correction.

[0074] Figure 33 These are the lateral aberration diagrams of the zoom lens in Embodiment 10 of the present invention during image shake correction and during image shake correction.

[0075] Figure 34 These are the lateral aberration diagrams of the zoom lens in Embodiment 11 of the present invention during image shake correction and during image shake correction.

[0076] Figure 35 This is a perspective view of the front side of a camera device according to an embodiment of the present invention.

[0077] Figure 36 This is a perspective view of the rear side of a camera device according to an embodiment of the present invention.

[0078] Symbol Explanation

[0079] 1-Zoom lens, 20-Interchangeable lens, 30-Camera, 31-Camera body, 32-Shutter button, 33-Power button, 34, 35-Operation unit, 36-Display unit, 37-Leg mount, G1-First lens group, G2-Second lens group, G3-Third lens group, G3F-Front group of the third lens group, G3R-Rear group of the third lens group, G4-Fourth lens group, G5-Fifth lens group, L11- Lens 1, L12 - Lens 2, L13 - Lens 3, L21-L24, L31-L34, L41, L42, L51-L53 - Lenses, ma, ta, wa - On-axis beams, mb, mc, tb, tc, wb, wc - Beams with maximum viewing angles, PP - Optical components, Sim - Image plane, St - Aperture, Y - Maximum image height, Z - Optical axis, ωw - Maximum half-angle. Detailed Implementation

[0080] Hereinafter, embodiments related to the technology of the present invention will be described in detail with reference to the accompanying drawings. Figure 1 The image shows a cross-sectional view of the lens structure in various zoom states according to an embodiment of the present invention. Furthermore, in... Figure 12 The middle shows Figure 1 The image shows a cross-sectional view of the lens structure and light beam at various zoom levels of the zoom lens. Figure 1 and Figure 12 The example shown corresponds to the zoom lens of Embodiment 1 described later. Figure 1 and Figure 12 In the diagram, the left side represents the object side, and the right side represents the image side. It shows the state of focusing on an object at infinity. The top row, labeled "Wide Angle," shows the wide-angle state; the middle row, labeled "Middle," shows the middle focal length state; and the bottom row, labeled "Telephoto," shows the telephoto state. Figure 12 In the diagram, the on-axis beam wa and the beams wb and wc at maximum angle are shown as the beams at the wide-angle end; the on-axis beam ma and the beams mb and mc at maximum angle are shown as the beams at the intermediate focal length; and the on-axis beam ta and the beams tb and tc at maximum angle are shown as the beams at the telephoto end. Furthermore, the beams wb, mb, and tb at maximum angle correspond to the beams with the maximum image height on the - side, and the beams wc, mc, and tc at maximum angle correspond to the beams with the maximum image height on the + side. Here, in Figure 12 In this model, the side above the Z-axis of the optical axis is designated as the "+" side of the image height, and the side below is designated as the "-" side. The following mainly refers to... Figure 1 Please provide an explanation.

[0081] exist Figure 1 and Figure 12 The image illustrates an example of a zoom lens being used in a camera device, with a parallel flat optical component PP positioned between the zoom lens and the image plane (Sim). The optical component PP is envisioned as various filters and / or cover glass, etc. These filters include, for example, low-pass filters, infrared cutoff filters, and filters that cut off specific wavelength regions. The optical component PP may be a component without refractive power, or it may be omitted from the design.

[0082] The zoom lens of the present invention comprises only five lens groups arranged sequentially along the optical axis Z from the object side toward the image side: a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, a third lens group G3 with positive refractive power, a fourth lens group G4 with negative refractive power, and a fifth lens group G5 with positive refractive power. Furthermore, the zoom lens of the present invention has an aperture St positioned between the image-side lens surface of the second lens group G2 and the object-side lens surface of the fourth lens group G4. However, Figure 1The aperture St shown indicates the position on the optical axis, not the shape.

[0083] The zoom lens of this invention employs a refractive power configuration of positive-negative-positive-negative-positive from the object side toward the image side. The refractive power configuration of the lens system is symmetrically centered on the third lens group G3, thereby effectively correcting distortion aberrations and chromatic aberration. This ensures a wide angle of view at the wide-angle end.

[0084] In the zoom lens of the present invention, during zooming, all the intervals in the optical axis direction of adjacent lens groups are changed, thereby causing at least the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 to move along the optical axis Z. Figure 1 In the example shown, during zooming, lens groups G1 through G4 move along the optical axis Z along different trajectories, while lens group G5 remains fixed relative to the image plane Sim. Figure 1 In the top and middle rows of the diagrams, arrows below each lens group that moves during zoom indicate the approximate direction of movement of each lens group when zooming towards the telephoto side, and grounding marks are shown below the lens groups that are fixed relative to the image plane Sim during zooming.

[0085] The first lens group G1 comprises three lenses in sequence from the object side to the image side: a first lens L11 with negative refractive power, a second lens L12 with positive refractive power, and a third lens L13 with positive refractive power. By arranging the first lens group G1 into a three-lens structure as described above, it is easy to effectively correct spherical aberration and axial chromatic aberration at the telephoto end, and image plane curvature and distortion aberration at the wide-angle end, which is beneficial for achieving high zoom ratios and wide viewing angles at the wide-angle end. The first lens L11 and the second lens L12 can be joined together, and with this configuration, it is further beneficial for correcting axial chromatic aberration at the telephoto end.

[0086] As an example, in Figure 1 In the zoom lens of the example shown, the second lens group G2 includes four lenses L21 to L24 sequentially from the object side to the image side; the third lens group G3 includes four lenses L31 to L34 sequentially from the object side to the image side; the fourth lens group G4 includes two lenses L41 to L42 sequentially from the object side to the image side; and the fifth lens group G5 includes three lenses L51 to L53 sequentially from the object side to the image side. However, as shown in the embodiments described later, the number of lenses constituting the second lens group G2 to the fifth lens group G5 can be set to... Figure 1 The examples shown have different numbers of pieces.

[0087] As an example, the second lens group G2 can be configured to include three negative lenses and one positive lens. With this configuration, the negative refractive power of the second lens group G2 can be shared by the three negative lenses, thus facilitating the correction of coma and astigmatism. Furthermore, since the second lens group G2 includes both negative and positive lenses, chromatic aberration is easily corrected. More specifically, the second lens group G2 can be configured to include, from the object side towards the image side, a negative lens, a negative lens, a positive lens, and another negative lens in sequence.

[0088] The third lens group G3 is preferably configured to have image jitter correction function. To correct image jitter, it is preferable that the entire third lens group G3 or a portion of the third lens group G3 is moved in a direction intersecting the optical axis Z. That is, when correcting image jitter, it is preferable that the entire third lens group G3 or a portion of the third lens group G3 is moved in a direction intersecting the optical axis Z. Hereinafter, the lens group that moves when correcting image jitter will be referred to as the anti-vibration lens group.

[0089] In zoom lenses where the refractive power is arranged in a positive-negative-positive-negative-positive sequence from the object side to the image side, increasing the positive refractive power of the third lens group G3 is advantageous when miniaturization is desired. In this configuration, by placing the anti-shake lens group within the third lens group G3, the refractive power of the anti-shake lens group is easily ensured, reducing the amount of movement of the anti-shake lens group when correcting image shake. Furthermore, since the aperture St is positioned within the aforementioned range, the off-axis ray height in the third lens group G3 is lower. By placing the anti-shake lens group within the third lens group G3, where the off-axis ray height is low, the diameter of the anti-shake lens group can be reduced. This reduces the load on the drive system that drives the anti-shake lens group, contributing to the miniaturization of the device. Additionally, to reduce the load on the drive system of the anti-shake lens group, the anti-shake lens group is preferably configured as a whole of the third lens group G3 or as a part of the third lens group G3.

[0090] When the anti-vibration lens group is configured in the third lens group G3, it is preferable that the third lens group G3 includes, from the object side to the image side, a front group G3F with positive refractive power and a rear group G3R with positive refractive power. In order to correct image jitter, only the rear group G3R of the third lens group moves in a direction intersecting the optical axis Z. By setting the above structure, the light beam with positive refractive power converged through the front group G3F of the third lens group can be incident on the rear group G3R of the third lens group, which serves as the anti-vibration lens group, thus the diameter of the anti-vibration lens group can be kept relatively small.

[0091] Furthermore, in zoom lenses with refractive powers arranged in positive-negative-positive-negative-positive order from the object side to the image side, the third lens group G3 primarily bears the convergent function of the entire system, and for miniaturization, the refractive power of the third lens group G3 needs to be increased. If the refractive powers of the front group G3F and the rear group G3R of the third lens group are given different signs, it is difficult to ensure the overall refractive power of the third lens group G3, which is therefore undesirable. Alternatively, it would be necessary to increase the refractive power of a lens group further away from the image side than the third lens group G3, making it difficult to effectively correct aberrations such as spherical aberration, which is also undesirable. Considering the above, it is preferable to set the refractive powers of both the front group G3F and the rear group G3R of the third lens group to positive.

[0092] When the third lens group G3 includes the aforementioned front group G3F and rear group G3R of the third lens group, and only the rear group G3R of the third lens group is configured as a vibration-damping lens group, the rear group G3R of the third lens group preferably includes a single positive lens. By using a single lens to form the rear group G3R of the third lens group as a vibration-damping lens group, the vibration-damping lens group can be miniaturized and made lighter, reducing the load on the drive system of the vibration-damping lens group. This enables miniaturization of the actuator and even the entire device.

[0093] The front group G3F of the third lens group preferably includes two positive lenses and one negative lens. By arranging the front group G3F of the third lens group in the above-described structure, even when the refractive power of the front group G3F of the third lens group is increased for miniaturization, or even when the refractive power of the front group G3F of the third lens group is increased to reduce the ray height incident on the rear group G3R of the third lens group, which serves as an anti-vibration lens group, is increased, spherical aberration and chromatic aberration can be easily and effectively corrected. Furthermore, by keeping the number of lenses in the front group G3F of the third lens group no more than the above-described number, it is beneficial to miniaturize the entire system.

[0094] exist Figure 1 In the example shown, the front group G3F of the third lens group includes lenses L31 to L33, and the rear group G3R of the third lens group includes lens L34. (Note: This is a simplified explanation of the concept of lens group G3F.) Figure 1 The double vertical arrow above lens L34 in the lower row of the diagram indicates that lens L34 constitutes the anti-vibration lens group. Figure 1 In the top and middle rows of the diagrams, the arrows representing the anti-vibration lens group have been omitted to avoid complicating the diagrams.

[0095] The fourth lens group G4 preferably includes one positive lens and one negative lens. With this arrangement, chromatic aberration generated in the fourth lens group G4 can be well corrected. Furthermore, by comprising the fourth lens group G4 with only two lenses, miniaturization of the entire system is advantageous. In the case of the fourth lens group G4 being composed of only these two lenses, these two lenses can be joined together, and this joining further facilitates miniaturization.

[0096] Preferably, the fourth lens group G4 is configured to focus by moving along the optical axis Z. That is, when focusing from an object at infinity to a closer object, it is preferable that only the fourth lens group G4 among the five lens groups moves along the optical axis v. Hereinafter, the lens group that moves during focusing will be referred to as the focusing lens group. Figure 1 In the example shown, when focusing from an object at infinity to a closer object, the fourth lens group G4 moves towards the image side. This is recorded in... Figure 1 The right-pointing arrow above the fourth lens group G4 in the lower row of the diagram indicates that when focusing from an object at infinity to a closer object, the fourth lens group G4 is a focusing lens group that moves towards the image side. Figure 1 In the top and middle rows of the diagrams, the arrows representing the focusing lens group have been omitted to avoid complicating the diagrams.

[0097] The fourth lens group G4 is positioned between the third lens group G3 and the fifth lens group G5, which are both lenses with positive refractive power. Therefore, it is easy to reduce the outer diameter of the lens. By making the fourth lens group G4 the focusing lens group, it is easy to miniaturize and lighten the focusing lens group, which is beneficial for high-speed autofocus and can reduce the load on the driving system of the focusing lens group.

[0098] As an example, the fifth lens group G5 can be configured to include two positive lenses and one negative lens. This configuration facilitates good correction of magnification chromatic aberration and image plane curvature. When the fifth lens group G5 includes the aforementioned three lenses, it can be configured as a combined lens consisting of a positive lens and a negative lens joined sequentially from the object side towards the image side, and a single lens with positive refractive power.

[0099] Alternatively, the fifth lens group G5 can be configured to include a single positive lens. This configuration is advantageous for miniaturization.

[0100] The fifth lens group G5 can be configured to be fixed relative to the image plane Sim during zooming. By setting the lens group located on the image side to be fixed during zooming, the intrusion of dust and other contaminants can be reduced.

[0101] Alternatively, the fifth lens group G5 can be configured to move along the optical axis Z during zooming. With this configuration, the degrees of freedom for aberration correction are increased, further improving optical performance.

[0102] Next, the structure related to the conditional expression will be explained. When the focal length of the first lens group G1 is set to f1 and the focal length of the fifth lens group G5 is set to f5, the zoom lens of the present invention satisfies the following conditional expression (1). By setting it to not be below the lower limit of conditional expression (1), it is possible to prevent the refractive power of the first lens group G1 from becoming too strong, thus making it particularly easy to correct spherical aberration and on-axis chromatic aberration at the telephoto end. Alternatively, by setting it to not be below the lower limit of conditional expression (1), it is possible to prevent the refractive power of the fifth lens group G5 from becoming too weak, thus making it possible to prevent the incident angle of the off-axis principal ray to the imaging element arranged on the image plane Sim from becoming too large, resulting in the reduction of shadows. By setting it to not be above the upper limit of conditional expression (1), it is possible to prevent the refractive power of the first lens group G1 from becoming too weak, thus making it possible to suppress the amount of movement of the first lens group G1 during zooming, resulting in the miniaturization of the lens system. Alternatively, by setting it to not exceed the upper limit of condition (1), it is possible to prevent the refractive power of the fifth lens group G5 from becoming too strong, thus easily and effectively correcting image plane curvature and distortion aberrations at the wide-angle end. Furthermore, if the structure satisfies the following condition (1-1), it can achieve even better characteristics, and if the structure satisfies the following condition (1-2), it can achieve even better characteristics.

[0103] 0.4 < f1 / f5 < 2 (1)

[0104] 0.45 < f1 / f5 < 1.8 (1-1)

[0105] 0.5 < f1 / f5 < 1.6 (1-2)

[0106] Furthermore, when the focal length of the fourth lens group G4 is set to f4 and the focal length of the fifth lens group G5 is set to f5, the zoom lens of the present invention satisfies the following conditional expression (2). By setting it to not be below the lower limit of conditional expression (2), it is possible to prevent the refractive power of the fourth lens group G4 from becoming too weak relative to the refractive power of the fifth lens group G5, thus easily suppressing the variation of chromatic aberration during zoom while effectively correcting astigmatism and image plane curvature. By setting it to not be above the upper limit of conditional expression (2), it is possible to prevent the refractive power of the fourth lens group G4 from becoming too strong relative to the refractive power of the fifth lens group G5, thus easily correcting spherical aberration effectively. In addition, if the structure satisfies the following conditional expression (2-1), it can achieve even better characteristics, and if the structure satisfies the following conditional expression (2-2), it can achieve even better characteristics.

[0107] -0.7 < f4 / f5 < -0.1 (2)

[0108] -0.64 < f4 / f5 < -0.15 (2-1)

[0109] -0.58 < f4 / f5 < -0.2 (2-2)

[0110] Furthermore, when the refractive index of the second lens L12 relative to the d-line is set to Nd2, the zoom lens of the present invention satisfies the following conditional expression (3). By setting it to not be below the lower limit of conditional expression (3), the lens system can be easily miniaturized. By setting it to not be above the upper limit of conditional expression (3), axial chromatic aberration can be easily and well corrected. In addition, if the structure satisfies the following conditional expression (3-1), it can achieve even better characteristics, and if the structure satisfies the following conditional expression (3-2), it can achieve even better characteristics.

[0111] 1.6 < Nd2 < 2 (3)

[0112] 1.62 < Nd2 < 1.96 (3-1)

[0113] 1.63 < Nd2 < 1.93 (3-2)

[0114] Furthermore, the zoom lens of the present invention preferably satisfies the following condition formula. When the back focal length in air-equivalent distance is set to BFw when the wide-angle end is focused on an object at infinity, and the sum of the distance on the optical axis from the lens surface closest to the object to the lens surface closest to the image, and the back focal length in air-equivalent distance is set to TLw, the following condition formula (4) is preferably satisfied. By setting it to not be below the lower limit of condition formula (4), the required back focal length for interchangeable lens cameras and the like can be easily ensured. By setting it to not be above the upper limit of condition formula (4), the back focal length will not become too long, so the range of lenses that can be arranged can be increased relative to the total optical length, thus ensuring the range of movement of each lens group during zoom. As a result, the refractive power of each lens group can be prevented from becoming too strong, thus easily suppressing aberrations and ensuring good optical performance. In addition, if the structure satisfies the following condition formula (4-1), even better characteristics can be achieved.

[0115] 0.07 < BFw / TLw < 0.25 (4)

[0116] 0.1 < BFw / TLw < 0.23 (4-1)

[0117] In a structure in which the third lens group G3, from the object side to the image side, sequentially includes a front group G3F of the third lens group with positive refractive power and a rear group G3R of the third lens group with positive refractive power, and only the rear group G3R of the third lens group is set as an anti-vibration lens group, the following arrangement is preferred. That is, when the focal length of the rear group G3R of the third lens group is set to f3R and the focal length of the front group G3F of the third lens group is set to f3F, the following condition (5) is satisfied. By setting it to not be below the lower limit value of condition (5), it is possible to prevent the refractive power of the rear group G3R of the third lens group from becoming too strong. By setting it to not be above the upper limit value of condition (5), it is possible to prevent the refractive power of the front group G3F of the third lens group from becoming too strong. By setting f3R / f3F within the range of condition (5), the positive refractive power of the third lens group G3 can be appropriately distributed to the front group G3F and the rear group G3R of the third lens group, thereby reducing the difference in spherical aberration curves caused by the wavelength during magnification. Furthermore, it can suppress the sensitivity to performance degradation caused by assembly errors such as the relative tilt of the front group G3F and the rear group G3R of the third lens group. Moreover, the sensitivity for image jitter correction can be appropriately set, and aberration variations during image jitter correction can be well suppressed. Additionally, if the structure satisfies the following condition (5-1), even better characteristics can be achieved.

[0118] 0.1 < f3R / f3F < 0.9 (5)

[0119] 0.15 < f3R / f3F < 0.8 (5-1)

[0120] In a structure in which the third lens group G3 sequentially comprises a front group G3F with positive refractive power and a rear group G3R with positive refractive power from the object side to the image side, and only the rear group G3R of the third lens group is set as the anti-vibration lens group, the following configuration is preferred. That is, when the lateral magnification of the rear group G3R of the third lens group is set to β3Rt when the object is focused at infinity at the telephoto end, and the combined lateral magnification of the fourth lens group G4 and the fifth lens group G5 is set to β45t when the object is focused at infinity at the telephoto end, the following conditional expression (6) is satisfied. (1-β3Rt)×β45t in conditional expression (6) represents the amount of image movement on the image plane Sim relative to the amount of movement of the anti-vibration lens group in the direction perpendicular to the optical axis Z, i.e., the anti-vibration sensitivity. Conditional expression (6) is an expression representing the preferred range of this anti-vibration sensitivity. By setting it to not be below the lower limit value of conditional expression (6), the amount of movement of the anti-vibration lens group when correcting image jitter can be reduced. Therefore, it is possible to suppress the increase in the diameter of the anti-vibration lens group and reduce the load on the drive system that drives the anti-vibration lens group. By setting it to not exceed the upper limit of condition (6), it is possible to suppress the sensitivity degradation caused by assembly errors such as the relative tilt of the anti-vibration lens group and the lens group disposed on its object side and image side. Furthermore, if the anti-vibration sensitivity becomes too high, it may sometimes lead to an undesirable situation where image jitter correction is difficult to perform stably, but by setting it to not exceed the upper limit of condition (6), this undesirable situation can be prevented. In addition, if the structure satisfies the following condition (6-1), even better characteristics can be achieved.

[0121] 2<(1-β3Rt)×β45t<5 (6)

[0122] 2.3<(1-3Rt)×β45t<4.5 (6-1)

[0123] Furthermore, in a structure in which the third lens group G3 sequentially includes a front group G3F of the third lens group with positive refractive power and a rear group G3R of the third lens group with positive refractive power from the object side to the image side, and only the rear group G3R of the third lens group is set as an anti-vibration lens group, the following arrangement is preferred. That is, when the dispersion coefficient of the d-line reference of at least one positive lens in the rear group G3R of the third lens group is set to vd3Rp, the following conditional expression (7) is satisfied. By setting it to not be below the lower limit value of conditional expression (7), the variation of chromatic aberration during image jitter correction can be suppressed. By setting it to not be above the upper limit value of conditional expression (7), the refractive index of the material constituting the positive lens can be prevented from becoming too low and the lens can be made thinner, thus contributing to miniaturization. In addition, if the structure is set to satisfy the following conditional expression (7-1), it can have better characteristics, and if the structure is set to satisfy the following conditional expression (7-2), it can have even better characteristics.

[0124] 65<νd3Rp<105(7)

[0125] 72<ν d3Rp>100 (7-1)

[0126] 80<ν d3Rp>98 (7-2)

[0127] In a structure where only the fourth lens group G4 is used as the focusing lens group, when the lateral magnification of the fourth lens group G4 is set to β4t when focusing on an object at infinity at the telephoto end, and the lateral magnification of the fifth lens group G5 is set to β5t when focusing on an object at infinity at the telephoto end, it is preferable to satisfy the following condition (8). Condition (8) has (1-β4t) 2 )×β5t 2 The focal point sensitivity is the amount of movement relative to the optical axis of the fourth lens group G4, which is the focusing lens group, at the telephoto end. Condition (8) represents the preferred range of this focal point sensitivity. By setting it to not be below the lower limit of condition (8), the sensitivity can suppress performance degradation relative to the eccentricity error of the fourth lens group G4. Furthermore, by setting it to not be below the lower limit of condition (8), the refractive power of the fourth lens group G4 is less likely to become excessively strong, thus facilitating good correction of spherical aberration. By setting it to not be above the upper limit of condition (8), the amount of movement of the fourth lens group G4 during focusing can be reduced, enabling faster autofocus or a shorter minimum shooting distance. Additionally, if the structure satisfies condition (8-1), it can achieve even better characteristics; if the structure satisfies condition (8-2), it can achieve even better characteristics.

[0128] -7<(1-β4t 2 )×β5t 2 <-2.6 (8)

[0129] -6.5<(1-β4t 2 )×β5t 2 <-2.8 (8-1)

[0130] -6.2<(1-β4t 2 )×β5t 2 <-3 (8-2)

[0131] In the structure of the fourth lens group G4, which includes one positive lens and one negative lens, when the d-line reference dispersion coefficient of the negative lens of the fourth lens group G4 is set to vd4n and the d-line reference dispersion coefficient of the positive lens of the fourth lens group G4 is set to vd4p, it is preferable to satisfy the following condition (9). By setting it to not be below the lower limit of condition (9), the difference between the dispersion of the positive lens and the dispersion of the negative lens constituting the fourth lens group G4 will not become too small, thus enabling good correction of chromatic aberration (especially magnification chromatic aberration). By setting it to not be above the upper limit of condition (9), it is possible to prevent the refractive index of the material used for the negative lens of the fourth lens group G4 from becoming low, thus facilitating good correction of image plane curvature. In addition, if the structure is set to satisfy the following condition (9-1), even better characteristics can be achieved.

[0132] 5<vd4n-v d4p<26 (9)

[0133] 7<νd4n-νd4p<24 (9-1)

[0134] When focusing on an object at infinity at the wide-angle end, the sum of the distance along the optical axis from the lens surface closest to the object to the lens surface closest to the image, and the back focal length (measured in air distance) is TLw, and the maximum image height is Y, it is preferable to satisfy the following condition (10). As an example, in Figure 12 The maximum image height Y is shown in the figure. By setting it to not be below the lower limit of condition (10), it is possible to prevent the refractive power of each group from becoming too strong, thus making it easy to correct various aberrations such as spherical aberration. Alternatively, by setting it to not be below the lower limit of condition (10), it is possible to configure lenses that ensure high optical performance and / or ensure high zoom ratio, etc. By setting it to not be above the upper limit of condition (10), the lens system can be configured in a small size. In addition, if the structure satisfies the following condition (10-1), it can have better characteristics, and if the structure satisfies the following condition (10-2), it can have even better characteristics.

[0135] 6 < TLw / |Y| < 8.6 (10)

[0136] 6.2 < TLw / |Y| < 8 (10-1)

[0137] 6.4 < TLw / |Y| < 7.6 (10-2)

[0138] When the optical axis spacing between the fourth lens group G4 and the fifth lens group G5 is set to D45t when focusing on an object at infinity at the telephoto end, and the optical axis spacing between the fourth lens group G4 and the fifth lens group G5 is set to D45w when focusing on an object at infinity at the wide-angle end, it is preferable to satisfy the following condition (11). By setting it to not be below the lower limit of condition (11), the variation of image plane curvature during zoom can be well suppressed. By setting it to not be above the upper limit of condition (11), the variation of chromatic aberration during zoom can be reduced. In addition, if the structure satisfies the following condition (11-1), even better characteristics can be achieved.

[0139] 2<D45t / D45w<13 (11)

[0140] 3 < D45t / D45w < 12 (11-1)

[0141] When the back focal length (in terms of air distance) is set to BFw when focusing on an object at infinity at the wide-angle end, the focal length of the zoom lens is set to fw when focusing on an object at infinity at the wide-angle end, and the maximum half-angle of view is set to ωw when focusing on an object at infinity at the wide-angle end, it is preferable to satisfy the following condition (12). As an example, in Figure 12 The maximum half-angle of view ωw is shown in the figure. By setting it to not be below the lower limit of condition (12), the required back focal length for interchangeable lens cameras and the like can be ensured. By setting it to not be above the upper limit of condition (12), the back focal length will not become too long, thus increasing the range of lenses that can be arranged relative to the total optical length, and thus ensuring the range of movement of each lens group during zoom. As a result, the refractive power of each lens group can be prevented from becoming too strong, thus easily suppressing aberrations and ensuring good optical performance. In addition, if the structure satisfies the following condition (12-1), it can have even better characteristics, and if the structure satisfies the following condition (12-2), it can have even better characteristics.

[0142] 0.5<BFw / (fw×tan|ωw|)<1.6 (12)

[0143] 0.6<BFw / (fw×tan|ωw|)<1.5 (12-1)

[0144] 0.7<BFw / (fw×tan|ωw|)<1.4 (12-2)

[0145] When the average value of the refractive index of the second lens L12 relative to the d-line and the refractive index of the third lens L13 relative to the d-line in the first lens group G1 is set to NdG1p, it is preferable to satisfy the following condition (12). By setting it to not be below the lower limit of condition (12), the lens system can be easily miniaturized. By setting it to not be above the upper limit of condition (13), axial chromatic aberration can be easily and well corrected. In addition, if the structure is set to satisfy the following condition (13-1), even better characteristics can be achieved.

[0146] 1.63 < NdG1p < 1.9 (13)

[0147] 1.64 < NdG1p < 1.85 (13-1)

[0148] When the focal length of the second lens group G2 is set to f2 and the focal length of the third lens group G3 is set to f3, it is preferable to satisfy the following condition (14). By setting it to not be below the lower limit of condition (14), the amount of movement of the second lens group G2 during zoom can be reduced, or the second lens group G2 can have a strong zoom function. By setting it to not be above the upper limit of condition (14), it is particularly easy to correct chromatic aberration at the wide-angle end. In addition, if the structure is set to satisfy the following condition (14-1), even better characteristics can be achieved.

[0149] -1.3 < f2 / f3 < -0.4 (14)

[0150] -1.1 < f2 / f3 < -0.5 (14-1)

[0151] When the focal length of the first lens group G1 is set to f1 and the focal length of the second lens group G2 is set to f2, it is preferable to satisfy the following condition (15). By setting it to not be below the lower limit of condition (15), the amount of movement of the first lens group G1 during zoom and the effective diameter of the lens closest to the object are reduced, making it easy to miniaturize the entire system. By setting it to not be above the upper limit of condition (15), spherical aberration and on-axis chromatic aberration at the telephoto end can be easily and well corrected. In addition, if the structure satisfies the following condition (15-1), it can achieve even better characteristics, and if the structure satisfies the following condition (15-2), it can achieve even better characteristics.

[0152] -8 < f1 / f2 < -3 (15)

[0153] -7.3 < f1 / f2 < -3.5 (15-1)

[0154] -6.6 < f1 / f2 < -4 (15-2)

[0155] When the focal length of the third lens group G3 is set to f3 and the focal length of the fourth lens group G4 is set to f4, it is preferable to satisfy the following condition (16). The third lens group G3 and the fourth lens group G4 are lens groups with a relatively high ray height for on-axis marginal rays. By satisfying condition (16), the ratio of the positive refractive power of the third lens group G3 to the negative refractive power of the fourth lens group G4 can be appropriately set, thus enabling good correction of spherical aberration. In addition, if the structure is designed to satisfy the following condition (16-1), even better characteristics can be achieved.

[0156] -0.9 < f3 / f4 < -0.4 (16)

[0157] -0.8 < f3 / f4 < -0.5 (16-1)

[0158] When the focal length of the second lens group G2 is set to f2 and the focal length of the fourth lens group G4 is set to f4, it is preferable to satisfy the following condition (17). By setting it to not be below the lower limit of condition (17), it is possible to prevent the refractive power of the second lens group G2 from becoming too strong, thereby reducing the variation of distortion aberration and image plane curvature during zoom. By setting it to not be above the upper limit of condition (17), it is possible to prevent the refractive power of the fourth lens group G4 from becoming too strong, thereby making it easier to correct spherical aberration well. In addition, if the structure is set to satisfy the following condition (17-1), even better characteristics can be achieved.

[0159] 0.2 < f2 / f4 < 0.8 (17)

[0160] 0.3 < f2 / f4 < 0.7 (17-1)

[0161] In the above structure in which the third lens group G3 includes, from the object side to the image side, a front group G3F of the third lens group with positive refractive power and a rear group G3R of the third lens group with positive refractive power, and only the rear group G3R of the third lens group is set as the anti-vibration lens group, the following arrangement is preferred. That is, when the focal length of the rear group G3R of the third lens group is set to f3R and the focal length of the third lens group G3 is set to f3, the following condition (18) is satisfied. By setting it to not be below the lower limit of condition (18), the refractive power of the anti-vibration lens group can be prevented from becoming too strong, and thus the changes in coma and chromatic aberration when the anti-vibration lens group moves can be suppressed. Furthermore, the stability of image jitter correction can be prevented from decreasing due to excessively high anti-vibration sensitivity. By setting it to not be above the upper limit of condition (18), the refractive power of the anti-vibration lens group can be prevented from becoming too weak, and thus the amount of movement of the anti-vibration lens group when correcting image jitter can be reduced. Furthermore, if the structure satisfies the following condition (18-1), it can become a better characteristic; if the structure satisfies the following condition (18-2), it can become an even better characteristic.

[0162] 0.6 < f3R / f3 < 1.8 (18)

[0163] 0.7 < f3R / f3 < 1.6 (18-1)

[0164] 0.8 < f3R / f3 < 1.4 (18-2)

[0165] In a structure where only the fourth lens group G4 is used as the focusing lens group, when the lateral magnification of the fourth lens group G4 is set to β4w when focusing on an object at infinity at the wide-angle end, and the lateral magnification of the fifth lens group G5 is set to β5w when focusing on an object at infinity at the wide-angle end, it is preferable to satisfy the following condition (19). Condition (19) (1-β4w) 2 )×β5w 2 The focal point sensitivity is the amount of movement relative to the optical axis of the fourth lens group G4, which is the focusing lens group, at the wide-angle end. Condition (19) represents the preferred range of this focal point sensitivity. By setting it to be below the lower limit of condition (19), the sensitivity can suppress performance degradation relative to the eccentricity error of the fourth lens group G4. Furthermore, by setting it to be below the lower limit of condition (19), the refractive power of the fourth lens group G4 is less likely to become excessively strong, thus facilitating good correction of spherical aberration. By setting it to be above the upper limit of condition (19), the amount of movement of the fourth lens group G4 during focusing can be reduced, thus helping to shorten the total optical length at the wide-angle end and enabling high-speed autofocus. Additionally, if the structure satisfies the following condition (19-1), even better characteristics can be achieved.

[0166] -3.1<(1-β4w 2 )×β5w 2 <-1.2 (19)

[0167] -2.8<(1-β4w 2 )×β5w 2 <-1.4 (19-1)

[0168] When the chromatic dispersion coefficient of the first lens of the first lens group G1 is set to v d1, it is preferable to satisfy the following condition (20). By setting it to not be below the lower limit of condition (20), it is particularly effective to correct axial chromatic aberration at the telephoto end. In addition, if the negative dispersion coefficient of the first lens increases and the difference between it and the positive dispersion coefficient of the second lens decreases, then in order to correct axial chromatic aberration, it is necessary to increase the refractive power of the first and second lenses, but this will lead to increased spherical aberration and image plane curvature. By setting it to not be above the upper limit of condition (20), it is possible to prevent the refractive power of the first and second lenses from becoming too strong in order to correct axial chromatic aberration, which is particularly beneficial for correcting spherical aberration and image plane curvature on the telephoto side. In addition, if the structure satisfies the following condition (20-1), it can have even better characteristics.

[0169] 15<νd1<26 (20)

[0170] 16<νd1<25 (20-1)

[0171] When the fourth lens group G4 has at least one positive lens and at least one negative lens, and the chromatic aberration coefficient of the d-line reference of the positive lens of the fourth lens group G4 is set to vd4p, the fourth lens group G4 preferably has at least one positive lens that satisfies the following condition (21). By setting it to not be below the lower limit of condition (21), it is easy to correct the on-axis chromatic aberration on the telephoto side (especially the chromatic aberration on the short wavelength side). In addition, if the chromatic aberration coefficient of the positive lens of the fourth lens group G4 increases and the difference between its chromatic aberration coefficient and that of the negative lens of the fourth lens group G4 decreases, then in order to correct the on-axis chromatic aberration, it is necessary to increase the refractive power of both the positive and negative lenses, but this will lead to an increase in spherical aberration and coma. By setting it to not be above the upper limit of condition (21), it is possible to prevent the refractive power of each lens constituting the fourth lens group G4 from becoming too strong, which is especially beneficial for correcting spherical aberration and coma of order 5 or higher on the telephoto side. Furthermore, if the structure is designed to satisfy the following condition (21-1), it can achieve even better characteristics.

[0172] 15 < vd4p < 28 (21)

[0173] 16 < νd4p < 26 (21-1)

[0174] The above-described preferred and feasible structures can be combined in any way, and are preferably selectively adopted according to the required specifications. According to the technology of the present invention, a zoom lens that ensures a wide angle of view and a high zoom ratio while achieving miniaturization and good optical performance can be realized. Furthermore, "wide angle of view" here refers to a maximum half-angle of 40 degrees or more at the wide-angle end, and "high zoom ratio" refers to a zoom ratio of 4x or more.

[0175] Next, a numerical embodiment of the zoom lens of the present invention will be described.

[0176] [Example 1]

[0177] A cross-sectional view showing the structure of the zoom lens of Embodiment 1 is shown in Figure 1 The illustrated method and structure are as described above, therefore, some repetitive descriptions are omitted here. The zoom lens of Embodiment 1, from the object side to the image side, sequentially includes a first lens group G1 with positive refractive power, a second lens group G2 with negative refractive power, an aperture St, a third lens group G3 with positive refractive power, a fourth lens group G4 with negative refractive power, and a fifth lens group G5 with positive refractive power. The third lens group G3, from the object side to the image side, sequentially includes a front third lens group G3F with positive refractive power and a rear third lens group G3R with positive refractive power. The first lens group G1, from the object side to the image side, sequentially includes three lenses: a first lens L11, a second lens L12, and a third lens L13. The second lens group G2, from the object side to the image side, sequentially includes four lenses: lenses L21 to L24. The front third lens group G3F, from the object side to the image side, sequentially includes three lenses: lenses L31 to L33. The third lens group, rear group G3R, includes lens L34. The fourth lens group, G4, includes lenses L41 to L42 sequentially from the object side to the image side. The fifth lens group, G5, includes lenses L51 to L53 sequentially from the object side to the image side. When zooming from the wide-angle end to the telephoto end, the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 change all the spacing in the optical axis direction of adjacent lens groups and move along the optical axis Z, while the fifth lens group G5 is fixed relative to the image plane Sim. The image stabilization lens group only includes the third lens group, rear group G3R. The focusing lens group only includes the fourth lens group G4. The above is a summary of the zoom lens of Embodiment 1.

[0178] Regarding the zoom lens of Embodiment 1, basic lens data is shown in Table 1, specifications and variable surface spacing are shown in Table 2, and aspherical coefficients are shown in Table 3. In Table 1, the Sn column shows the surface numbering with the surface closest to the object side as the first surface and the numbering increasing sequentially towards the image side; the R column shows the radius of curvature of each surface; and the D column shows the surface spacing on the optical axis between each surface and its adjacent surface on the image side. Furthermore, the Nd column shows the refractive index of each component relative to the d-line; the νd column shows the dispersion coefficient of each component based on the d-line; and the θgF column shows the partial dispersion ratio between the g-line and F-line of each component.

[0179] In Table 1, the radius of curvature of the convex surface facing the object side is marked positive, and the radius of curvature of the convex surface facing the image side is marked negative. Table 1 also shows the optical components PP and the aperture diaphragm St, with the surface number and the term (St) listed in the column corresponding to the surface number of the aperture diaphragm St. The bottom column of D in Table 1 represents the interval between the image-side surface and the image plane Sim. In Table 1, the notation DD[] is used for variable surface intervals that change with magnification; the object-side surface number of this interval is indicated in [] and recorded in column D.

[0180] Table 2 shows the zoom ratio Zr, focal length f, F-number FNo., maximum full angle of view 2ω, and variable surface spacing during zoom. The (°) in the 2ω column indicates the unit as degrees. In Table 2, the values ​​for the wide-angle, intermediate focal length, and telephoto ends are shown in the columns labeled "Wide-angle," "Intermediate," and "Telephoto," respectively. The values ​​shown in Tables 1 and 2 are based on the d-line when focusing on an object at infinity.

[0181] In Table 1, the aspherical surfaces are marked with an asterisk (*), and the paraxial radius of curvature is recorded in the column for the radius of curvature of the aspherical surfaces. In Table 3, the surface number of the aspherical surface is shown in the Sn column, and the aspherical coefficients for each aspherical surface are shown in the KA and Am (m = 3, 4, 5, ..., 10) columns. The "E±n" (n: integer) value for the aspherical coefficients in Table 3 represents "×10". ±n KA and Am are the aspheric coefficients in the aspheric formula expressed by the following equation.

[0182] Zd=C×h 2 / {1+(1-KA×C 2 ×h 2 ) 1 / 2}+∑Am×h m

[0183] in,

[0184] Zd: Aspherical depth (the length of the perpendicular line from a point on the aspherical surface at height h to a plane tangent to the vertex of the aspherical surface and perpendicular to the optical axis);

[0185] h: Height (distance from the optical axis to the lens surface);

[0186] C: The reciprocal of the paraxial radius of curvature;

[0187] KA, Am: Aspheric coefficients

[0188] In aspherical form, ∑ represents the summation related to m.

[0189] In the data in each table, degrees are used as the unit for angles and millimeters as the unit for lengths. However, optical systems can use both magnified and reduced scales, so other appropriate units can also be used. Furthermore, the values ​​are rounded to a specified number of decimal places in the tables shown below.

[0190] [Table 1]

[0191] Example 1

[0192] 1 147.65954 1.500 1.84666 23.78 0.62054 2 66.26836 5.470 1.75976 52.02 0.54640 3 413.58552 0.150 4 61.13525 4.830 1.74437 53.56 0.54443 5 210.90455 DD[5] *6 293.87219 1.500 1.80998 40.95 0.56644 *7 13.80754 8.421 8 -17.04404 0.700 1.66656 56.91 0.54500 9 -55.15886 0.705 10 117.74408 3.699 1.94595 17.98 0.65460 11 -39.74485 1.406 12 -20.28011 0.700 1.84700 22.65 0.62089 13 -30.35505 DD

[13] 14 (St) ∞ 0.500 *15 19.72898 4.886 1.68948 31.02 0.59874 *16 -228.86837 2.415 17 35.75828 0.700 1.85896 22.73 0.62844 18 11.37584 3.606 1.61800 63.33 0.54414 19 19.94929 1.600 *20 17.11541 5.718 1.49700 81.61 0.53887 *21 -22.47607 DD

[21] 22 78.01772 2.000 1.85896 22.73 0.62844 23 -105.36171 0.610 1.80440 39.59 0.57297 24 20.27468 DD

[24] 25 119.51326 3.106 1.61807 47.62 0.56442 26 -75.27031 1.300 1.81996 46.01 0.5557g 27 120.38400 0.933 *28 -109.16204 3.553 1.58313 59.38 0.54237 *29 -31.21099 14.685 30 ∞ 2.850 1.51680 64.20 0.53430 31 ∞ 1.000

[0193] [Table 2]

[0194] Example 1

[0195] Zr 1.000 2.215 4.713 f 16.504 36.548 77.783 FNo. 4.12 4.13 4.13 2ω(°) 87.2 40.8 19.8 DD[5] 0.800 14.741 35.652 DD

[13] 19.488 6.274 1.188 DD

[21] 2.496 3.840 2.495 DD

[24] 3.861 17.125 31.386

[0196] [Table 3]

[0197] Example 1

[0198] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -2.0156062E-05 -5.1708119E-05 -3.7833014E-05 -2.8854059E-05 A5 3.1332925E-06 3.8228839E-06 8.9432918E-06 1.2730218E-05 A6 1.0876565E-07 -1.1063845E-08 -1.8848688E-06 -3.2220609E-06 A7 -1.7774067E-08 -2.4210034E-08 8.0755296E-08 2.5722342E-07 A8 -2.0072742E-11 3.3662549E-09 1.2507349E-08 1.3197679E-08 A9 3.3457813E-11 -3.8954053E-11 -1.2306669E-09 -3.4051477E-09 A10 -3.6041271E-13 -1.1521318E-11 -1.3124899E-11 1.2147994E-10

[0199] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -3.8001832E-05 3.2816072E-05 9.9652891E-06 3.7008339E-05 A5 -1.4671735E-05 -1.2839953E-05 5.3568193E-06 -1.8060076E-06 A6 8.9777112E-06 7.3318923E-06 -5.3160786E-07 2.4328182E-07 A7 -2.5684771E-06 -1.9257261E-06 1.2498677E-08 -1.2493449E-09 A8 3.9432287E-07 2.7375207E-07 1.8271499E-09 -1.5154824E-09 A9 -3.1518780E-08 -2.0706246E-08 -1.7695720E-10 6.3461976E-11 A10 1.0102143E-09 6.3878265E-10 4.9789359E-12 -2.0584295E-15

[0200] exist Figure 13 and Figure 24 The diagram shows the aberrations of the zoom lens of Embodiment 1 when focused on an object at infinity. Figure 13 The image shows aberration maps without jitter correction. Figure 13 In the image, from left to right, spherical aberration, astigmatism, distortion aberration, and magnification chromatic aberration are shown. Figure 13 In the spherical aberration diagram, the top row labeled "Wide-angle" shows aberrations at wide-angle, the middle row labeled "Intermediate" shows aberrations at intermediate focal length, and the bottom row labeled "Telephoto" shows aberrations at telephoto. In the spherical aberration diagram, aberrations below the d-line, C-line, F-line, and g-line are shown using solid lines, long dashed lines, short dashed lines, and single-dot dashed lines, respectively. In the astigmatism diagram, aberrations below the d-line in the sagittal direction are shown using solid lines, and aberrations below the d-line in the meridional direction are shown using short dashed lines. In the distortion aberration diagram, aberrations below the d-line are shown using solid lines. In the magnification chromatic aberration diagram, aberrations below the C-line, F-line, and g-line are shown using long dashed lines, short dashed lines, and single-dot dashed lines, respectively. In the spherical aberration diagram, FNo. represents the F-value; in other aberration diagrams, ω represents the half-angle.

[0201] exist Figure 24In the diagram, the left side labeled "No Image Shake Correction" shows the 10 lateral aberrations without image shake correction, while the right side labeled "With Image Shake Correction" shows the 10 lateral aberrations when the anti-shake lens group is moved in a direction perpendicular to the optical axis Z by an amount equivalent to a light ray tilt of -0.3 degrees. In the "No Image Shake Correction" diagram, the six diagrams in the left column represent aberrations in the meridional direction, and the four diagrams in the right column represent aberrations in the sagittal direction. From top to bottom, the diagrams show the aberrations at the position where the image height is 0 at the wide-angle end, the aberrations at the position where the image height is - on the - side of the wide-angle end, the aberrations at the position where the image height is + on the wide-angle end, the aberrations at the position where the image height is 0 at the telephoto end, the aberrations at the position where the image height is - on the - side of the telephoto end, and the aberrations at the position where the image height is + on the telephoto end. In the diagram, ω represents the half-angle of view, and the aberrations under the d-line, C-line, F-line, and g-line are shown with solid lines, long dashed lines, short dashed lines, and single-dot dashed lines, respectively. The diagram for "image jitter correction" is the same.

[0202] Unless otherwise specified, the notation, meaning, recording method, and illustration method of the data related to Embodiment 1 above are the same in the following embodiments, so repeated descriptions are omitted below.

[0203] [Example 2]

[0204] A cross-sectional view showing the structure of the zoom lens of Embodiment 2 is shown in Figure 2 The zoom lens of Embodiment 2 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 2, basic lens data are shown in Table 4, specifications and variable surface spacing are shown in Table 5, aspherical coefficients are shown in Table 6, and various aberrations are illustrated in Table 7. Figure 14 and Figure 25 .

[0205] [Table 4]

[0206] Example 2

[0207] 1 131.57797 1.500 1.84699 22.65 0.62089 2 67.55520 5.403 1.71053 55.97 0.54269 3 425.49740 0.150 4 58.77808 4.988 1.71727 55.64 0.54270 5 201.80604 DD[5] *6 416.64637 1.500 1.77322 44.08 0.56460 *7 13.41082 8.329 8 -17.23302 0.700 1.70216 49.39 0.55742 9 -56.24107 0.710 10 105.60952 3.078 1.94595 17.98 0.65460 11 -41.31604 1.393 12 -20.80363 0.700 1.84699 22.65 0.62089 13 -31.68401 DD

[13] 14 (St) ∞ 0.500 *15 18.85186 5.206 1.68948 31.02 0.59874 *16 -116.01791 2.093 17 62.51501 0.600 1.84573 22.71 0.62065 18 12.14801 3.609 1.58163 61.86 0.54174 19 23.68045 1.600 *20 16.74149 5.994 1.49700 81.61 0.53887 *21 -21.09500 DD

[21] 22 68.81562 2.112 1.85896 22.73 0.62844 23 -77.49432 0.610 1.80440 39.59 0.57297 24 17.95124 DD

[24] *25 116.14419 4.604 1.58313 59.38 0.54237 *26 -38.32872 0.150 27 -139.21760 1.500 1.74841 53.16 0.54494 28 34.13398 4.468 1.48749 70.24 0.53007 29 -517.25402 12.405 30 ∞ 2.850 1.51680 64.20 0.53430 31 ∞ 1.000

[0208] [Table 5]

[0209] Example 2

[0210] Zr 1.000 2.215 4.713 f 16.499 36.538 77.761 FNo. 4.12 4.13 4.13 2ω(°) 87.0 41.0 20.0 DD[5] 0.800 14.215 35.151 DD

[13] 19.731 6.650 2.034 DD

[21] 2.499 4.314 3.105 DD

[24] 4.241 17.050 31.033

[0211] [Table 6]

[0212] Example 2

[0213] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -1.4966116E-05 -4.8836895E-05 -2.2251192E-05 -8.4475879E-07 A5 2.4803547E-06 3.1121405E-06 6.3217095E-06 7.2024578E-06 A6 1.0988494E-07 1.3659886E-07 -1.6604772E-06 -2.0575753E-06 A7 -1.3252893E-08 -4.1764770E-08 1.4695868E-07 2.0514768E-07 A8 -1.5742775E-10 2.8763475E-09 4.4767350E-09 5.4178092E-09 A9 2.7322906E-11 1.8816394E-10 -1.3614374E-09 -2.2676798E-09 A10 -1.9198265E-13 -1.8097317E-11 3.9609326E-11 9.1845861E-11

[0214] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -4.5120903E-05 3.1124682E-05 1.3940193E-05 3.7240038E-05 A5 -1.5053854E-05 -1.0787545E-05 1.8917020E-06 -3.0716491E-06 A6 9.0451192E-06 6.7602758E-06 -7.5934360E-08 2.0095116E-07 A7 -2.6021055E-06 -1.8891461E-06 1.1141342E-08 3.8494441E-08 A8 3.9769025E-07 2.7813451E-07 -1.1552052E-09 -4.0348499E-09 A9 -3.1214244E-08 -2.1199576E-08 -5.8037554E-11 -7.9733250E-11 A10 9.7019543E-10 6.4468762E-10 7.6219560E-12 1.3365832E-11

[0215] [Example 3]

[0216] A cross-sectional view showing the structure of the zoom lens of Embodiment 3 is shown in Figure 3 The zoom lens of Embodiment 3 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 3, basic lens data are shown in Table 7, specifications and variable surface spacing are shown in Table 8, aspherical coefficients are shown in Table 9, and various aberrations are illustrated in Table 1. Figure 15 and Figure 26 .

[0217] [Table 7]

[0218] Example 3

[0219] 1 127.23794 1.500 1.95906 17.47 0.65993 2 68.36118 5.188 1.88300 40.76 0.56679 3 353.42458 0.150 4 51.05060 5.536 1.61014 60.76 0.54217 5 176.82084 DD[5] *6 197.67080 1.500 1.83268 39.67 0.57242 *7 12.65278 8.030 8 -16.65132 0.700 1.70054 56.20 0.54325 9 -64.65678 0.526 10 88.26127 3.078 1.94595 17.98 0.65460 11 -40.30466 1.695 12 -18.46617 0.700 1.79664 25.42 0.61156 13 -29.44876 DD

[13] 14 (St) ∞ 0.500 *15 19.22635 6.000 1.68948 31.02 0.59874 *16 -52.94274 1.415 17 66.22177 0.600 1.84693 22.65 0.62088 18 11.65503 5.166 1.51822 64.30 0.53826 19 47.46314 1.600 *20 17.59201 6.000 1.41390 100.82 0.53373 *21 -21.14694 DD

[21] 22 61.73120 2.000 1.95906 17.47 0.65993 23 -178.94136 0.610 1.80440 39.59 0.57297 24 16.61010 DD

[24] *25 202.68635 4.726 1.58313 59.38 0.54237 *26 -31.31369 0.877 27 -104.68838 1.500 1.85883 30.00 0.59793 28 32.17344 4.796 1.59827 46.77 0.56598 29 -259.27698 9.888 30 ∞ 2.850 1.51680 64.20 0.53430 31 ∞ 1.000

[0220] [Table 8]

[0221] Example 3

[0222] Zr 1.000 2.215 4.713 f 16.489 36.516 77.714 FNo. 4.13 4.13 4.13 2ω(°) 86.2 40.8 20.0 DD[5] 0.800 12.911 31.637 DD

[13] 17.932 7.217 2.961 DD

[21] 2.496 3.982 3.292 DD

[24] 5.645 20.110 33.038

[0223] [Table 9]

[0224] Example 3

[0225] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -1.7395978E-05 -5.3566161E-05 -2.7226806E-05 1.0020418E-06 A5 2.4371987E-06 3.5906409E-06 6.4928718E-06 7.3657138E-06 A6 1.0344411E-07 3.6976701E-08 -1.6697118E-06 -2.0833633E-06 A7 -1.2677658E-08 -4.6667222E-08 1.4480647E-07 2.0462468E-07 A8 -1.3209070E-10 2.5670020E-09 4.5420622E-09 5.1012960E-09 A9 2.7741079E-11 4.6681502E-10 -1.3619176E-09 -2.2513360E-09 A10 -3.0574453E-13 -3.5875113E-11 4.0475784E-11 9.4398056E-11

[0226] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -3.0824782E-05 3.9383615E-05 1.8948283E-05 4.9627909E-05 A5 -1.5396547E-05 -1.2125492E-05 2.1106325E-06 -3.1509149E-06 A6 8.9851464E-06 6.7627679E-06 -7.6404143E-08 2.0026483E-07 A7 -2.6039940E-06 -1.8805572E-06 1.2442486E-08 3.8679839E-08 A8 3.9904814E-07 2.7760299E-07 -1.2366207E-09 -3.9954683E-09 A9 -3.1272708E-08 -2.1241901E-08 -5.9605050E-11 -7.8251033E-11 A10 9.4962207E-10 6.2918187E-10 7.8724492E-12 1.3297708E-11

[0227] [Example 4]

[0228] A cross-sectional view showing the structure of the zoom lens of Embodiment 4 is shown in Figure 4 The zoom lens of Embodiment 4 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 4, basic lens data are shown in Table 10, specifications and variable surface spacing are shown in Table 11, aspherical coefficients are shown in Table 12, and various aberrations are illustrated in Table 13. Figure 16 and Figure 27 .

[0229] [Table 10]

[0230] Example 4

[0231] 1 140.15920 1.500 1.92286 18.90 0.64960 2 76.57562 4.600 1.77250 49.60 0.55212 3 338.17154 0.150 4 61.25862 4.716 1.77423 47.35 0.55640 5 190.24297 DD[5] *6 416.65153 1.500 1.80998 40.95 0.56644 *7 14.54810 8.214 8 -19.31908 0.700 1.67439 37.17 0.58327 9 -115.85599 0.150 10 98.21866 4.473 1.94595 17.98 0.65460 11 -36.04825 1.330 12 -21.47670 0.700 1.83667 23.17 0.61902 13 -30.19670 DD

[13] 14 (St) ∞ 0.500 *15 16.81445 5.001 1.68948 31.02 0.59874 *16 -245.46598 0.174 17 34.32449 0.700 1.85896 22.73 0.62844 18 11.10736 3.010 1.61800 63.33 0.54414 19 16.22876 1.600 *20 17.65941 5.267 1.49700 81.61 0.53887 *21 -22.39316 DD

[21] 22 130.93020 2.000 1.84666 23.78 0.62054 23 -90.34011 0.610 1.80440 39.59 0.57297 24 18.86350 DD

[24] 25 120.70098 3.000 1.77357 50.62 0.54837 26 -99.45133 1.310 1.76574 43.54 0.56641 27 123.89655 0.974 *28 -101.34788 3.778 1.58313 59.38 0.54237 *29 -27.87020 14.622 30 ∞ 2.850 1.51680 64.20 0.53430 31 ∞ 1.000

[0232] [Table 11]

[0233] Example 4

[0234] Zr 1.000 2.215 4.713 f 16.529 36.603 77.900 FNo. 4.12 4.12 4.12 2ω(°) 85.0 40.6 19.6 DD[5] 0.800 12.423 37.532 DD

[13] 22.958 6.937 1.196 DD

[21] 2.498 3.950 3.020 DD

[24] 3.826 18.352 28.365

[0235] [Table 12]

[0236] Example 4

[0237] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -2.1573661E-05 -3.9022740E-05 -4.8405706E-05 -4.4169435E-05 A5 3.4921030E-06 1.1943667E-06 8.8946671E-06 1.5305559E-05 A6 8.2025268E-08 4.2655315E-07 —2.1312271E-06 -3.5539537E-06 A7 -1.5931433E-08 -3.3045461E-08 9.2082608E-08 2.3009141E-07 A8 -3.1506580E-11 4.3607644E-10 1.3166819E-08 1.4786052E-08 A9 3.3946573E-11 1.1452099E-10 -1.3579324E-09 -3.5116072E-09 A10 -6.0576814E-13 -3.0153512E-12 -4.2184579E-11 1.2094256E-10

[0238] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -5.2874727E-05 2.3466953E-05 -4.1957056E-06 2.5963740E-05 A5 -7.3734243E-06 -8.3472818E-06 4.6862198E-06 -1.8441578E-06 A6 8.6426532E-06 7.1763170E-06 -4.8423437E-07 1.9590948E-07 A7 -2.6160163E-06 -1.9596690E-06 1.4614956E-08 2.5074796E-09 A8 3.9003698E-07 2.7207633E-07 2.0827550E-09 -1.3312155E-09 A9 -3.0978989E-08 -2.0482438E-08 -1.8838102E-10 8.4706074E-11 A10 1.0991537E-09 7.1873611E-10 5.3234032E-12 -9.1069571E-13

[0239] [Example 5]

[0240] A cross-sectional view showing the structure of the zoom lens of Embodiment 5 is shown in Figure 5 The zoom lens of Embodiment 5 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 5, basic lens data are shown in Table 13, specifications and variable surface spacing are shown in Table 14, aspherical coefficients are shown in Table 15, and various aberrations are illustrated in Table 16. Figure 17 and Figure 28 .

[0241] [Table 13]

[0242] Example 5

[0243] 1 276.64953 1.500 2.10420 17.02 0.66311 2 106.19860 4.552 1.89190 37.13 0.57813 3 -1677.82377 0.150 4 56.33140 4.817 1.77250 49.60 0.55212 5 155.87618 DD[5] *6 149.55316 1.500 1.80998 40.95 0.56644 *7 13.57868 8.395 8 -17.68901 0.700 1.70300 52.38 0.55070 9 -54.91943 0.875 10 105.03887 3.591 1.94595 17.98 0.65460 11 -46.32614 1.558 12 -20.64389 0.700 1.78880 28.43 0.60092 13 -30.18069 DD

[13] 14 (St) ∞ 0.500 *15 19.33407 5.075 1.68948 31.02 0.59874 *16 -182.20393 1.728 17 41.69835 0.700 1.77830 23.91 0.62490 18 10.65894 4.233 1.59410 60.47 0.55516 19 20.25219 1.600 *20 16.23382 6.000 1.43875 94.66 0.53402 *21 -20.10236 DD

[21] 22 77.20179 2.000 1.85896 22.73 0.62844 23 -120.80822 0.610 1.80440 39.59 0.57297 24 19.96950 DD

[24] 25 198.83439 3.010 1.95375 32.32 0.59056 26 -77.70704 1.300 2.00100 29.14 0.59974 27 173.84906 1.124 *28 -63.29840 3.294 1.58313 59.38 0.54237 *29 -27.70698 14.724 30 ∞ 2.850 1.51680 64.20 0.53430 31 ∞ 1.000

[0244] [Table 14]

[0245] Example 5

[0246] Zr 1.000 2.215 4.713 f 16.494 36.526 77.736 FNo. 4.12 4.13 4.13 2ω(°) 86.6 40.8 19.8 DD[5] 0.800 12.774 34.757 DD

[13] 19.916 6.256 1.433 DD

[21] 2.494 3.934 2.492 DD

[24] 3.953 18.598 32.685

[0247] [Table 15]

[0248] Example 5

[0249] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -2.3655363E-05 -5.3728186E-05 -3.4165966E-05 -2.5732809E-05 A5 2.8434972E-06 3.8702629E-06 9.0520891E-06 1.4563115E-05 A6 1.2915494E-07 -1.1307658E-07 -1.7407849E-06 -3.3956346E-06 A7 -1.5994964E-08 -1.5080856E-08 6.7458682E-08 2.5664612E-07 A8 -1.1375601E-10 3.5036777E-09 1.2063751E-08 1.4397885E-08 A9 2.9945832E-11 -1.2107170E-10 -1.1489145E-09 -3.3702215E-09 A10 -1.9862184E-13 -6.5028915E-12 -6.5171513E-12 1.1861303E-10

[0250] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -4.4280271E-05 4.4114101E-05 9.3389749E-06 4.0215836E-05 A5 -1.5653598E-05 -1.5431545E-05 6.7261449E-06 -8.4851556E-07 A6 9.0540750E-06 7.7459060E-06 -6.0563648E-07 1.9487091E-07 A7 -2.5669171E-06 -1.9405480E-06 1.1966300E-08 -3.1052206E-10 A8 3.9472318E-07 2.7266272E-07 1.6794483E-09 -1.8555477E-09 A9 -3.1668403E-08 -2.0784346E-08 -1.5723829E-10 8.6125504E-11 A10 1.0098062E-09 6.4383577E-10 4.7559789E-12 -1.2615438E-13

[0251] [Example 6]

[0252] A cross-sectional view showing the structure of the zoom lens of Embodiment 6 is shown in Figure 6 Except that the second lens group G2 includes three lenses L21 to L23 sequentially from the object side to the image side, and the fifth lens group G5 includes one lens L51, the zoom lens of Embodiment 6 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 6, basic lens data are shown in Table 16, specifications and variable surface spacing are shown in Table 17, aspherical coefficients are shown in Table 18, and various aberrations are illustrated in Table 19. Figure 18 and Figure 29 .

[0253] [Table 16]

[0254] Example 6

[0255] 1 195.53115 1.500 1.85896 22.73 0.62844 2 86.76544 5.023 1.72720 55.14 0.54272 3 1574.16747 0.150 4 59.25939 4.789 1.74873 53.13 0.54497 5 176.68922 DD[5] 6 95.14642 0.900 1.73147 54.85 0.54289 7 11.67452 8.554 *8 -22.02773 1.500 1.69350 53.20 0.54661 *9 -73.73379 0.863 10 181.48116 2.290 1.95906 17.47 0.65993 11 -90.14539 DD

[11] 12 (St) ∞ 0.500 *13 18.98763 5.806 1.68948 31.02 0.59874 *14 -103.40755 0.150 15 46.67854 0.600 1.84700 22.65 0.62089 16 12.35452 2.337 1.59597 60.18 0.54388 17 16.67564 1.600 *18 16.37080 5.591 1.49700 81.61 0.53887 *19 -18.28048 DD

[19] 20 115.11383 2.111 1.89286 20.36 0.63944 21 -72.73789 0.610 1.73800 32.33 0.59005 22 17.38170 DD

[22] *23 -194.24953 5.000 1.58313 59.38 0.54237 *24 -35.49614 15.307 25 ∞ 2.850 1.51680 64.20 0.53430 26 ∞ 1.000

[0256] [Table 17]

[0257] Example 6

[0258] Zr 1.000 2.068 4.124 f 16.494 34.108 68.018 FNo. 4.12 4.12 4.12 2ω(°) 86.8 43.4 22.8 DD[5] 0.800 15.581 36.540 DD

[11] 19.977 6.249 1.786 DD

[19] 2.498 4.682 3.255 DD

[22] 7.702 15.844 28.468

[0259] [Table 18]

[0260] Example 6

[0261] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 4.7373189E-05 2.5192973E-05 -6.3293482E-05 -5.7886884E-05 A5 -9.6054676E-06 -1.0829721E-05 6.7008866E-06 1.9094374E-06 A6 -4.9995523E-07 -2.8512812E-07 -2.2724721E-06 -1.6043189E-06 A7 1.8214891E-07 1.8202868E-07 1.5488404E-07 2.4076072E-07 A8 -8.7603437E-09 -9.8345504E-09 1.0364797E-08 -8.6072636E-09 A9 -1.0127774E-09 -1.0026794E-09 -2.2613856E-09 -2.7327284E-09 A10 6.8101188E-11 7.7857893E-11 4.1839797E-12 1.7631883E-10

[0262] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -5.6626742E-05 2.3149554E-05 -2.4360205E-05 -7.3443391E-06 A5 -1.7898609E-05 -3.4762525E-06 4.8569381E-06 -9.4393343E-07 A6 9.0631618E-06 5.4719541E-06 -1.8355027E-07 4.6339658E-07 A7 -2.5725642E-06 -1.9400684E-06 -6.6976288E-09 -2.2416225E-08 A8 4.0370075E-07 3.0286510E-07 9.8021940E-10 -1.6054852E-09 A9 -3.1983972E-08 -2.1697419E-08 -4.8407130E-11 1.6800329E-10 A10 8.8530237E-10 4.7630221E-10 1.0659909E-12 -3.9963385E-12

[0263] [Example 7]

[0264] A cross-sectional view showing the structure of the zoom lens of Embodiment 7 is shown in Figure 7 Except that the fifth lens group G5 includes only one lens, lens L51, and that all lens groups, including the fifth lens group G5, move along the optical axis Z by changing all the spacing of adjacent lens groups in the optical axis direction during zooming, the zoom lens of Embodiment 7 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 7, basic lens data are shown in Table 19, specifications and variable surface spacing are shown in Table 20, aspherical coefficients are shown in Table 21, and various aberrations are illustrated in Table 22. Figure 19 and Figure 30 .

[0265] [Table 19]

[0266] Example 7

[0267] 1 113.64101 1.500 1.84666 23.78 0.62054 2 58.14689 4.447 1.71345 55.83 0.54270 3 211.06714 0.150 4 51.16998 4.623 1.75865 52.14 0.54625 5 183.59726 DD[5] *6 416.72917 1.500 1.80139 45.45 0.55814 *7 12.09655 5.782 8 -29.29465 0.710 1.84701 43.30 0.56102 9 416.72918 3.417 1.87068 21.47 0.62537 10 -22.00226 0.936 *11 -24.17670 1.200 1.83135 33.60 0.58952 *12 -47.50496 DD

[12] 13 (St) ∞ 0.500 *14 17.67089 5.666 1.68948 31.02 0.59874 *15 -46.67564 0.150 16 77.29506 0.600 1.84700 22.65 0.62089 17 12.52123 2.313 1.54544 63.25 0.54027 18 17.13631 1.600 *19 16.87557 5.634 1.49700 81.61 0.53887 *20 -17.56029 DD

[20] 21 233.79674 1.952 1.89286 20.36 0.63944 22 -55.17846 0.610 1.73800 32.33 0.59005 23 18.48020 DD

[23] 24 -92.29233 4.722 1.68005 57.50 0.54262 25 -31.83840 DD

[25] 26 ∞ 2.850 1.51680 64.20 0.53430 27 ∞ 1.000

[0268] [Table 20]

[0269] Example 7

[0270] Zr 1.000 2.068 4.124 f 16.500 34.120 68.042 FNo. 4.12 4.12 4.12 2ω(°) 85.8 43.4 22.8 DD[5] 0.800 15.662 30.734 DD

[12] 17.213 6.756 1.182 DD

[20] 2.497 4.102 2.872 DD

[23] 6.364 15.608 26.540 DD

[25] 16.346 15.900 20.967

[0271] [Table 21]

[0272] Example 7

[0273] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 1.8091328E-05 -1.2314959E-05 -2.5016662E-04 -2.4329153E-04 A5 5.1803351E-06 1.5867207E-05 -5.0108301E-06 -4.8645063E-06 A6 -1.9803780E-07 -1.0912822E-06 3.7868352E-06 3.6275866E-06 A7 -3.7487095E-08 -2.6542143E-08 -2.8809156E-08 -2.4969052E-08 A8 1.2484754E-09 1.7170655E-08 -2.7839049E-08 -3.0653783E-08 A9 9.2233607E-11 -8.6841684E-11 -6.3320407E-11 4.3472503E-11 A10 -3.3072791E-12 -6.4486092E-11 5.4737239E-11 9.5255312E-11

[0274] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -8.0910133E-05 -5.5923151E-05 -6.0529074E-05 2.8994012E-05 A5 1.0582953E-05 1.0415673E-05 -1.2842890E-05 -2.9594968E-06 A6 -2.2364914E-06 -3.5019710E-06 8.0452982E-06 5.2756847E-06 A7 -6.6409847E-08 3.2795082E-07 -2.4875696E-06 -1.9390444E-06 A8 3.4546021E-08 4.0349678E-09 4.0134090E-07 3.0612004E-07 A9 -1.2577609E-09 -4.4216452E-09 -3.2658987E-08 -2.1920891E-08 A10 -2.3812027E-10 2.0147480E-10 9.8120085E-10 4.9326041E-10

[0275] [Example 8]

[0276] A cross-sectional view showing the structure of the zoom lens of Embodiment 8 is shown in Figure 8Except that the fifth lens group G5 includes only one lens, lens L51, and that all lens groups, including the fifth lens group G5, move along the optical axis Z by changing all the spacing of adjacent lens groups in the optical axis direction during zooming, the zoom lens of Embodiment 8 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 8, basic lens data are shown in Table 22, specifications and variable surface spacing are shown in Table 23, aspherical coefficients are shown in Table 24, and various aberrations are illustrated in Table 25. Figure 20 and Figure 31 .

[0277] [Table 22]

[0278] Example 8

[0279] 1 116.96901 1.500 1.84666 23.78 0.62054 2 62.11394 4.708 1.65474 58.76 0.54248 3 393.92446 0.150 4 50.08602 4.780 1.68308 57.35 0.54263 5 195.33798 DD[5] *6 416.66645 1.500 1.80139 45.45 0.55814 *7 11.69322 6.093 8 -31.71325 0.700 1.78877 49.12 0.55057 9 57.59597 4.182 1.78199 25.90 0.60989 10 -21.59297 0.613 *11 -27.18976 1.200 1.85135 40.10 0.56954 *12 -55.92124 DD

[12] 13 (St) ∞ 0.500 *14 15.27381 5.029 1.68948 31.02 0.59874 *15 -58.57788 0.710 16 135.18908 0.600 1.79459 25.27 0.61188 17 9.93672 2.231 1.53610 63.61 0.53967 18 16.62362 1.600 *19 14.45534 4.452 1.49700 81.61 0.53887 *20 -17.34341 DD

[20] 21 1369.27629 1.999 1.89286 20.36 0.63944 22 -36.54413 0.610 1.73800 32.33 0.59005 23 17.08005 DD

[23] 24 -96.75442 4.883 1.51599 53.22 0.55385 25 -28.74283 DD

[25] 26 ∞ 2.850 1.51680 64.20 0.53430 27 ∞ 1.000

[0280] [Table 23]

[0281] Example 8

[0282] Zr 1.000 2.215 4.713 f 16.495 36.528 77.740 FNo. 3.61 4.79 5.72 2ω(°) 86.4 41.2 20.2 DD[5] 0.800 12.570 32.398 DD

[12] 19.269 5.515 1.182 DD

[20] 2.498 4.663 3.260 DD

[23] 7.924 17.849 29.971 DD

[25] 14.660 15.418 17.415

[0283] [Table 24]

[0284] Example 8

[0285] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -5.3370017E-05 -9.2240206E-05 -2.1397479E-04 -2.0580119E-04 A5 1.2857344E-05 2.4601542E-05 -4.8937900E-06 -7.8781394E-06 A6 2.7493740E-09 -1.0854913E-06 3.2921030E-06 3.5195188E-06 A7 -9.9469272E-08 -1.2258560E-07 9.0515517E-09 5.6459044E-08 A8 2.5543665E-09 2.5391244E-08 -2.1559518E-08 -3.4837612E-08 A9 2.4298503E-10 3.1239151E-10 -4.2937320E-10 -5.6547589E-10 A10 -9.4647334E-12 -1.1498912E-10 1.1400081E-11 1.2284443E-10

[0286] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -5.8998224E-05 -4.3126794E-05 -1.0850211E-04 1.1213377E-05 A5 8.9478792E-07 3.1985514E-06 2.2247176E-06 1.0635823E-05 A6 -1.1123416E-06 -2.4298590E-06 6.0320674E-06 3.6812248E-06 A7 4.0793820E-08 3.6302388E-07 -2.5907002E-06 -2.0738128E-06 A8 1.0171003E-08 -1.9800330E-08 4.3938268E-07 3.4144147E-07 A9 -2.3885984E-09 -4.7031909E-09 -3.2513951E-08 -2.1331256E-08 A10 -1.2813731E-10 3.1586098E-10 7.8340797E-10 2.8684695E-10

[0287] [Example 9]

[0288] A cross-sectional view showing the structure of the zoom lens of Embodiment 9 is shown. Figure 9 Except that the fifth lens group G5 includes only one lens, lens L51, and that all lens groups, including the fifth lens group G5, move along the optical axis Z by changing all the spacing of adjacent lens groups in the optical axis direction during zooming, the zoom lens of Embodiment 9 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 9, basic lens data are shown in Table 25, specifications and variable surface spacing are shown in Table 26, aspherical coefficients are shown in Table 27, and various aberrations are illustrated in Table 28. Figure 21 and Figure 32 .

[0289] [Table 25]

[0290] Example 9

[0291] 1 63.32268 1.500 1.84666 23.78 0.62054 2 39.15094 5.253 1.73001 51.57 0.55042 3 96.46578 0.150 4 42.55067 4.863 1.78112 49.89 0.54941 5 132.53932 DD[5] *6 416.72918 1.500 1.80139 45.45 0.55814 *7 10.83401 6.151 8 -37.04296 0.710 1.84700 43.30 0.56102 9 416.72918 3.122 1.86858 21.57 0.62497 10 -25.51502 0.550 *11 -33.55142 1.200 1.84701 43.30 0.56102 *12 -85.47266 DD

[12] 13 (St) ∞ 0.500 *14 18.30004 4.910 1.68948 31.02 0.59874 *15 -60.60573 0.150 16 68.05349 0.600 1.84064 23.16 0.61917 17 12.81549 2.135 1.52740 52.31 0.55580 18 17.34604 1.600 *19 17.58352 5.629 1.49700 81.61 0.53887 *20 -16.81802 DD

[20] 21 216.54557 1.882 1.85896 22.73 0.62844 22 -59.49832 0.610 1.73800 32.33 0.59005 23 19.04753 DD

[23] 24 -112.34760 4.008 1.67878 53.85 0.55001 25 -30.30405 DD

[25] 26 ∞ 2.850 1.51680 64.20 0.53430 27 ∞ 1.000

[0292] [Table 26]

[0293] Example 9

[0294] Zr 1.000 2.068 4.124 f 16.524 34.170 68.141 FNo. 4.12 4.12 4.12 2ω(°) 84.8 43.8 23.0 DD[5] 0.800 12.584 23.745 DD

[12] 17.648 8.336 1.165 DD

[20] 3.540 4.468 3.155 DD

[23] 6.481 17.463 24.384 DD

[25] 16.802 16.887 26.509

[0295] [Table 27]

[0296] Example 9

[0297] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 1.2483959E-05 -2.1822112E-05 -2.4682274E-04 -2.4670708E-04 A5 5.1148046E-06 1.2567627E-05 -5.2400186E-06 -5.6908412E-06 A6 -1.7791453E-07 -4.9607841E-07 3.9026046E-06 3.7077117E-06 A7 -3.8805889E-08 -1.4624386E-08 -9.7211739E-09 1.3124815E-11 A8 1.5642458E-09 1.1750599E-08 -2.8850749E-08 -3.1460097E-08 A9 7.1751179E-11 -1.7414577E-10 1.3812847E-11 4.0932415E-11 A10 -3.3762849E-12 -1.0037514E-11 6.7087029E-11 8.9012201E-11

[0298] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -8.6565866E-05 -8.0561004E-05 -7.6341409E-05 1.0148045E-05 A5 9.8877771E-06 1.2318453E-05 -1.3773755E-05 1.0168377E-07 A6 -2.1362462E-06 -3.7643994E-06 8.4739468E-06 4.9693136E-06 A7 -8.2316639E-08 3.1662448E-07 -2.5212635E-06 -1.9345842E-06 A8 3.3253841E-08 5.3583168E-09 3.9874662E-07 3.0330134E-07 A9 -1.3565995E-09 -4.4399578E-09 -3.2945861E-08 -2.2069840E-08 A10 -2.3862198E-10 1.9520412E-10 9.7946305E-10 4.8729525E-10

[0299] [Example 10]

[0300] A cross-sectional view showing the structure of the zoom lens of Embodiment 10 is shown in Figure 10 Except that the fifth lens group G5 includes lens L51, and that all lens groups, including the fifth lens group G5, move along the optical axis Z by changing the spacing of all adjacent lens groups in the optical axis direction during zooming, the zoom lens of Embodiment 10 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 10, basic lens data are shown in Table 28, specifications and variable surface spacing are shown in Table 29, aspherical coefficients are shown in Table 30, and various aberrations are illustrated in Table 30. Figure 22 and Figure 33 .

[0301] [Table 28]

[0302] Example 10

[0303] 1 110.51724 1.500 1.84666 23.78 0.62054 2 55.36877 5.023 1.64850 53.02 0.55487 3 315.13587 0.150 4 53.12546 4.604 1.72818 52.65 0.54819 5 223.06908 DD[5] *6 416.61482 1.500 1.80139 45.45 0.55814 *7 12.08307 5.872 8 -31.48789 0.700 1.79921 48.08 0.55222 9 67.98488 4.020 1.79300 25.35 0.61163 10 -21.48315 0.651 *11 -24.95184 1.200 1.85135 40.10 0.56954 *12 -53.43944 DD

[12] 13 (St) ∞ 0.500 *14 15.38319 4.983 1.68948 31.02 0.59874 *15 -56.10848 0.854 16 193.00748 0.600 1.81718 25.31 0.61244 17 10.21793 2.123 1.53291 63.71 0.53949 18 16.53024 1.768 *19 14.54004 4.814 1.53775 74.70 0.53936 *20 -17.19165 DD

[20] 21 -893.74776 2.227 1.89286 20.36 0.63944 22 -33.66060 0.610 1.73800 32.33 0.59005 23 16.84692 DD

[23] 24 -76.65356 4.390 1.51600 59.57 0.54486 25 -26.95790 DD

[25] 26 ∞ 2.850 1.51680 64.20 0.53430 27 ∞ 1.000

[0304] [Table 29]

[0305] Example 10

[0306] Zr 1.000 2.215 4.713 f 16.503 36.546 77.777 FNo. 3.61 4.84 5.77 2ω(°) 87.0 41.4 20.2 DD[5] 0.800 12.167 32.605 DD

[12] 19.040 5.621 1.169 DD

[20] 2.499 4.521 3.573 DD

[23] 8.190 19.285 30.369 DD

[25] 14.585 14.988 16.619

[0307] [Table 30]

[0308] Example 10

[0309] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -5.0917286E-05 -8.8075470E-05 -2.1379959E-04 -2.0413890E-04 A5 1.2781851E-05 2.4829902E-05 -5.0991835E-06 -7.8919736E-06 A6 -3.2468558E-09 -1.1836899E-06 3.3263984E-06 3.5371433E-06 A7 -9.9764766E-08 -1.0715768E-07 1.9812913E-08 5.5232556E-08 A8 2.5347225E-09 2.4607403E-08 -2.2830503E-08 -3.4472923E-08 A9 2.4339282E-10 2.5218920E-10 -4.3353828E-10 -5.6005695E-10 A10 -9.2161232E-12 -1.1775357E-10 1.1269996E-11 1.2018373E-10

[0310] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -5.6765193E-05 -4.4655190E-05 -1.0074194E-04 2.4509451E-05 A5 -1.3128489E-06 4.8343020E-07 -5.3553740E-08 7.1248534E-06 A6 -1.0972584E-06 -2.4736241E-06 5.6518125E-06 3.5612444E-06 A7 2.8407847E-08 3.5501580E-07 -2.5162466E-06 -2.0291991E-06 A8 1.0487077E-08 -1.9909438E-08 4.3729982E-07 3.4086074E-07 A9 -2.7278899E-09 -4.5520823E-09 -3.2450348E-08 -2.1485957E-08 A10 -1.2685596E-10 3.1668339E-10 7.6894063E-10 2.8683412E-10

[0311] [Example 11]

[0312] A cross-sectional view showing the structure of the zoom lens of Embodiment 11 is shown in Figure 11 The zoom lens of Embodiment 11 has the same general structure as the zoom lens of Embodiment 1. Regarding the zoom lens of Embodiment 11, basic lens data are shown in Table 31, specifications and variable surface spacing are shown in Table 32, aspherical coefficients are shown in Table 33, and various aberrations are illustrated in Table 34. Figure 23 and Figure 34 .

[0313] [Table 31]

[0314] Example 11

[0315] 1 128.24623 1.500 1.84666 23.78 0.62054 2 66.35400 5.420 1.72916 54.67 0.54503 3 370.23098 0.150 4 60.85319 4.910 1.69680 55.53 0.54404 5 218.25042 DD[5] *6 294.10562 2.000 1.80780 40.89 0.56949 *7 13.29231 8.380 8 -17.12196 0.700 1.61800 63.39 0.54015 9 -108.18599 0.150 10 89.95607 3.620 1.92287 20.88 0.63943 11 -33.23372 1.450 12 -19.01017 0.700 1.84667 23.79 0.61771 13 -27.63008 DD

[13] 14 (St) ∞ 1.100 *15 16.62717 4.510 1.68893 31.16 0.60397 *16 -416.39974 1.640 17 50.66171 0.700 1.84667 23.79 0.61771 18 10.88100 3.750 1.61800 63.39 0.54015 19 19.23257 1.600 *20 16.53927 5.890 1.49710 81.56 0.53859 *21 -20.80043 DD

[21] 22 87.20800 2.000 1.85896 22.73 0.62844 23 -87.20800 0.610 1.80440 39.59 0.57297 24 20.15648 DD

[24] 25 398.56925 3.300 1.51680 64.20 0.53430 26 -46.61600 1.200 1.69350 53.35 0.54844 27 ∞ 0.511 *28 -83.44813 3.690 1.58313 59.46 0.54067 *29 -29.56019 14.614 30 ∞ 2.850 1.51680 64.20 0.53430 31 ∞ 1.000

[0316] [Table 32]

[0317] Example 11

[0318] Zr 1.000 2.215 4.713 f 16.497 36.533 77.751 FNo. 4.12 4.12 4.13 2ω(°) 87.2 40.4 19.8 DD[5] 0.800 16.301 36.160 DD

[13] 20.010 6.315 0.948 DD

[21] 2.400 3.974 2.502 DD

[24] 4.010 15.227 30.211

[0319] [Table 33]

[0320] Example 11

[0321] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -2.8490089E-05 -7.0282771E-05 -2.6026370E-05 -5.2519720E-06 A5 3.4001978E-06 5.3460017E-06 8.9327675E-06 1.1905465E-05 A6 8.6025369E-08 -3.5251621E-08 —2.0288251E-06 -2.8991687E-06 A7 -1.5881372E-08 -6.1941991E-08 1.4984851E-07 2.5206330E-07 A8 4.6954316E-11 6.3478737E-09 8.9124018E-09 1.1490979E-08 A9 2.5563829E-11 4.1329015E-11 -1.6175571E-09 -3.0037271E-09 A10 -2.8828379E-13 -2.5970681E-11 3.8219433E-11 1.0930036E-10

[0322] KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 0.0000000E+00 0.0000000E+00 0.0000000E+00 A4 -5.1646523E-05 3.0888509E-05 2.2349857E-05 4.5879069E-05 A5 -1.3212713E-05 -1.1362506E-05 5.5598856E-06 -1.7722904E-06 A6 9.0512974E-06 7.4686715E-06 -8.5821407E-07 2.7031166E-07 A7 -2.6426652E-06 -2.0164295E-06 1.4544149E-08 -3.9980318E-08 A8 3.9970349E-07 2.7982876E-07 3.8678891E-09 4.4104943E-10 A9 -3.0895564E-08 -1.9958501E-08 -1.9921474E-10 2.3673571E-10 A10 9.5538736E-10 5.7836273E-10 -3.5162202E-14 -1.1877867E-11

[0323] Table 34 shows the corresponding values ​​of the conditional expressions (1) to (21) for the zoom lenses of Examples 1 to 11.

[0324] Examples 1-11 use the d-line as the reference wavelength. Table 34 shows the values ​​based on the d-line reference.

[0325] [Table 34]

[0326] (1) f1 / f5 0.837 0.719 0.621 1.422 0.936 1.247 (2) f4 / f5 -0.342 -0.267 -0.250 -0.442 -0.381 -0.423 (3) Nd2 1.760 1.711 1.883 1.773 1.892 1.727 (4) BFw / TLw 0.168 0.147 0.123 0.169 0.169 0.184 (5) f3R / f3F 0.387 0.365 0.682 0.374 0.434 0.227 (6) (1β3Rt)×β45t 3.079 3.247 2.711 2.752 2.946 3.103 (7) νd3Rp 81.61 81.61 100.82 81.61 94.66 81.61 (8) <![CDATA[(1-β4t 2 )×β5t 2 ]]> -4.038 -4.494 -4.694 -4.374 -4.084 -3.845 (9) νd4n-νd4p 16.86 16.86 22.12 15.81 16.86 11.97 (10) TLw / |Y| 7.339 7.327 7.326 7.291 7.343 6.974 (11) D45t / D45w 8.129 7.315 5.852 7.414 8.267 3.696 (12) BFw / (fw×tan|ωw|) 1.117 0.979 0.829 0.844 1.135 1.166 (13) NdG1p 1.752 1.714 1.747 1.773 1.832 1.738 (14) f2 / f3 -0.771 -0.758 -0.663 -0.940 -0.773 -0.895 (15) f1 / f2 -5.727 -5.845 -6.204 -5.021 -5.559 -5.447 (16) f3 / f4 -0.554 -0.609 -0.604 -0.682 -0.572 -0.604 (17) f2 / f4 0.427 0.461 0.401 0.641 0.442 0.541 (18) f3R / f3 1.020 1.003 1.247 1.075 1.058 0.975 (19) <![CDATA[(1-β4w 2 )×β5w 2 ]]> -1.648 -1.869 -1.867 -1.991 -1.620 -1.966 (20) νd1 23.78 22.65 17.47 18.90 17.02 22.73 (21) νd4p 22.73 22.73 17.47 23.78 22.73 20.36

[0327] (1) f1 / f5 1.153 1.022 1.080 1.026 0.961 (2) f4 / f5 -0.436 -0.338 -0.513 -0.318 -0.370 (3) Nd2 1.713 1.655 1.730 1.649 1.729 (4) BFw / TLw 0.204 0.182 0.207 0.182 0.168 (5) f3R / f3F 0.297 0.250 0.236 0.193 0.336 (6) (1-β3Rt)×β45t 3.095 3.655 3.044 4.033 3.140 (7) νd3Rp 81.61 81.61 81.61 74.70 81.56 (8) <![CDATA[(1-β4t 2 )×β5t 2 ]]> -3.953 -5.538 -3.407 -5.997 -4.069 (9) νd4n-νd4p 11.97 11.97 9.60 11.97 16.86 (10) TLw / |Y| 6.627 6.765 6.702 6.766 7.338 (11) D45t / D45w 4.170 3.782 3.762 3.708 10.876 (12) BFw / (fw×tan|ωw|) 1.255 1.133 1.304 1.115 1.117 (13) NdG1p 1.736 1.669 1.756 1.688 1.713 (14) f2 / f3 -0.831 -0.853 -0.743 -0.856 -0.804 (15) f1 / f2 -5.351 -5.313 -4.769 -5.469 -5.612 (16) f3 / f4 -0.594 -0.666 -0.594 -0.689 -0.575 (17) f2 / f4 0.494 0.569 0.442 0.590 0.462 (18) f3R / f3 1.019 0.954 1.001 0.902 0.982 (19) <![CDATA[(1-β4w 2 )×β5w 2 ]]> -1.962 -2.553 -1.809 -2.743 -1.709 (20) vd1 23.78 23.78 23.78 23.78 23.78 (21) νd4p 20.36 20.36 22.73 20.36 22.73

[0328] As can be seen from the above data, the zoom lenses of Examples 1 to 11 have a wide field of view with a maximum half angle of view of more than 42 degrees at the wide-angle end, a high zoom ratio of more than 4 times, achieve miniaturization, and have good suppression of various aberrations, thus achieving high optical performance.

[0329] Next, the imaging device according to the embodiments of the present invention will be described. Figure 35 and Figure 36 The diagram shows the external appearance of the camera 30 of the imaging device according to one embodiment of the present invention. Figure 35 The image shows a perspective view of camera 30 from the front side. Figure 36 The image shows a perspective view of the camera 30 as seen from the rear side. The camera 30 is a so-called mirrorless digital camera, which can be detachably fitted with an interchangeable lens 20. The interchangeable lens 20 is configured to include a zoom lens 1 according to an embodiment of the present invention housed within a lens barrel.

[0330] The camera 30 includes a camera body 31, and a shutter button 32 and a power button 33 are provided on the upper surface of the camera body 31. Furthermore, an operation unit 34, an operation unit 35, and a display unit 36 ​​are provided on the back of the camera body 31. The display unit 36 ​​can display the captured image and the image existing in the field of view before the shot.

[0331] A camera aperture for light from the subject is provided at the center of the front surface of the camera body 31. A clip 37 is provided at the position corresponding to the camera aperture, and the interchangeable lens 20 is mounted to the camera body 31 via the clip 37.

[0332] The camera body 31 contains an imaging element such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) that outputs an imaging signal corresponding to the image of the subject formed by the interchangeable lens 20, a signal processing circuit that processes the imaging signal output from the imaging element and generates an image, and a recording medium for recording the generated image. In this camera 30, pressing the shutter button 32 allows for the capture of still or moving images, and the resulting image data is recorded in the aforementioned recording medium.

[0333] The present invention has been described above with examples of embodiments and examples, but the technology of the present invention is not limited to the above embodiments and examples, and various modifications are possible. For example, the radius of curvature, surface spacing, refractive index, dispersion coefficient, and aspherical coefficient of each lens are not limited to the values ​​shown in the above numerical embodiments, and other values ​​can be used.

[0334] Furthermore, the imaging device involved in the embodiments of the present invention is not limited to the examples described above, and can be configured as various types of cameras other than mirrorless cameras, film cameras, video cameras, etc.

Claims

1. A zoom lens, characterized in that, It only has five lens groups as lens groups, arranged sequentially from the object side to the image side: a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power. An aperture diaphragm is disposed between the lens surface of the second lens group closest to the image and the lens surface of the fourth lens group closest to the object. During zooming, the spacing of all adjacent lens groups along the optical axis is changed, thereby moving the first, second, third, and fourth lens groups along the optical axis, while keeping the fifth lens group fixed relative to the image plane. When focusing from an object at infinity to a closer object, only the fourth lens group moves along the optical axis. The second lens group includes: A meniscus lens with a convex surface on the object side and the first negative lens located on the object side in the second lens group. A second negative lens, whose object-side surface is concave and disposed adjacent to the image side of the first negative lens; and A third negative lens has a concave surface on the object side and is positioned further on the image side than the second negative lens. The third lens group consists of only four lenses, including one negative lens and three positive lenses, to serve as refractive elements. The negative lens of the third lens group and one of the three positive lenses in the third lens group are joined sequentially from the object side to the image side. When the focal length of the first lens group is set to f1, Set the focal length of the fifth lens group to f5. Set the focal length of the fourth lens group to f4. Set the focal length of the third lens group to f3. The back focal length, measured in air distance, is set to BFw when focusing on an object at infinity at the wide-angle end. When focusing on an object at infinity at the wide-angle end, the sum of the distance along the optical axis from the lens surface closest to the object to the lens surface closest to the image, and the back focal length measured in air-converted distance, is defined as TLw. The following conditions (1-3), (2), (16-2) and (4-2) must be satisfied. 0.621≤f1 / f5≤1.422 (1-3) -0.7 < f4 / f5 < -0.1 (2) -0.682 ≤ f3 / f4 < -0.4 (16-2) 0.168≤BFw / TLw<0.25 (4-2).

2. The zoom lens according to claim 1, wherein, The focal length of the zoom lens is set to fw when it is focusing on an object at infinity at the wide-angle end. When the maximum half-angle view is set to ωw when focusing on an object at infinity at the wide-angle end, The following condition (12) must be satisfied. 0.5 <BFw / (fw×tan|ωw|)<1.6 (12)。 3. The zoom lens according to claim 2, wherein, The following condition (12-3) must be satisfied. 0.829≤BFw / (fw×tan|ωw|)<1.6 (12-3).

4. The zoom lens according to claim 3, wherein, When the focal length of the second lens group is set to f2... The following condition (14) must be satisfied. -1.3 <f2 / f3<-0.4 (14)。 5. The zoom lens according to claim 4, wherein, The following condition (17) must be satisfied. 0.2 <f2 / f4<0.8 (17)。 6. The zoom lens according to claim 5, wherein, The second lens group, from the object side to the image side, includes the first negative lens, the second negative lens, the biconvex lens, and the third negative lens in sequence.

7. The zoom lens according to claim 6, wherein, The lens closest to the image side in the fifth lens group is a positive meniscus lens with a convex image side surface.

8. A zoom lens, characterized in that, It only has five lens groups as lens groups, arranged sequentially from the object side to the image side: a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power. An aperture diaphragm is disposed between the lens surface of the second lens group closest to the image and the lens surface of the fourth lens group closest to the object. During zooming, all the spacing in the optical axis direction of adjacent lens groups is changed, thereby causing at least the first lens group, the second lens group, the third lens group, and the fourth lens group to move along the optical axis. When focusing from an object at infinity to a closer object, only the fourth lens group moves along the optical axis. The second lens group includes: A meniscus lens with a convex surface on the object side and the first negative lens located on the object side in the second lens group. A second negative lens, whose object-side surface is concave and disposed adjacent to the image side of the first negative lens; and A third negative lens has a concave surface on the object side and is positioned further on the image side than the second negative lens. The third lens group consists of only four lenses, including one negative lens and three positive lenses, to serve as refractive elements. The negative lens of the third lens group and one of the three positive lenses in the third lens group are joined sequentially from the object side to the image side. The fifth lens group includes a positive meniscus lens with a convex image-side surface. When the focal length of the first lens group is set to f1, Set the focal length of the fifth lens group to f5. Set the focal length of the fourth lens group to f4. The back focal length, measured in air distance, is set to BFw when focusing on an object at infinity at the wide-angle end. When focusing on an object at infinity at the wide-angle end, the sum of the distance along the optical axis from the lens surface closest to the object to the lens surface closest to the image, and the back focal length measured in air-converted distance, is defined as TLw. The following conditions (1-2), (2) and (4-3) must be met. 0.5 < f1 / f5 < 1.6 (1-2) -0.7 <f4 / f5<-0.1 (2) 0.182≤BFw / TLw<0.25 (4-3).

9. The zoom lens according to claim 8, wherein, The focal length of the zoom lens is set to fw when it is focusing on an object at infinity at the wide-angle end. When the maximum half-angle view is set to ωw when focusing on an object at infinity at the wide-angle end, The following condition (12) must be satisfied. 0.5 <BFw / (fw×tan|ωw|)<1.6 (12)。 10. The zoom lens according to claim 9, wherein, The following condition (12-4) must be satisfied. 0.5<BFw / (fw×tan|ωw|)≤1.255 (12-4).

11. The zoom lens according to claim 10, wherein, When the focal length of the second lens group is set to f2, When the focal length of the third lens group is set to f3... The following condition (14) must be satisfied. -1.3 < f2 / f3 < -0.4 (14).

12. The zoom lens according to claim 11, wherein, The following condition (16) must be satisfied. -0.9 <f3 / f4<-0.4 (16)。 13. The zoom lens according to claim 12, wherein, The following condition (17) must be satisfied. 0.2 <f2 / f4<0.8 (17)。 14. The zoom lens according to claim 13, wherein, The second lens group, from the object side to the image side, includes the first negative lens, the second negative lens, the biconvex lens, and the third negative lens in sequence.

15. A camera device, characterized in that, The zoom lens is provided with any one of claims 1 to 14.

Images