Zoom lens and imaging device

Abstract

The present invention provides a zoom lens having a compact configuration, having a high zoom ratio, and maintaining good optical performance, and an imaging device provided with the zoom lens. The zoom lens sequentially comprises a front group, a middle group and a rear group from an object side to an image side. The front group includes two or less lens groups having positive refractive power. The lens group closest to the object side of the front group is fixed with respect to the image plane during zooming. The intermediate group includes a lens group having two or less negative refractive powers. The rear group includes a plurality of lens groups. The lens group closest to the object side of the rear group has positive refractive power, and the lens group closest to the image side of the rear group is fixed with respect to the image plane during zooming. When zooming is carried out, all intervals between adjacent lens groups can be changed. The zoom lens satisfies a predetermined conditional expression.

Description

Technical Field

[0001] The technology of the present invention relates to a zoom lens and an imaging device. Background Art

[0002] Conventionally, as a zoom lens having a long focal length on the telephoto side, for example, a zoom lens described in Patent Document 1 listed below is known.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2020-064153

[0004] There is a demand for a zoom lens that is compact, has a high zoom ratio, and maintains good optical performance. These requirements are increasing year by year. Summary of the invention

[0005] The present invention provides a zoom lens which is compact, has a high zoom ratio, and maintains good optical performance, and an imaging device having the zoom lens.

[0006] A zoom lens according to one embodiment of the present invention includes, in order from the object side to the image side, a front group, a middle group, and a rear group, wherein the front group includes two or less lens groups having positive power, the lens group of the front group closest to the object side is fixed relative to the image plane when the magnification is changed, the middle group includes two or less lens groups having negative power, the rear group includes a plurality of lens groups, the lens group of the rear group closest to the object side has positive power, the lens group of the rear group closest to the image side is fixed relative to the image plane when the magnification is changed, and when the magnification is changed, all intervals between adjacent lens groups are changed, and the zoom lens satisfies conditional formula (1) represented by the following formula:

[0007] 0.4<(ft / fw) / Movmax(1). Here, the focal length of the entire system in the state of focusing on an object at infinity at the telephoto end is ft. The focal length of the entire system in the state of focusing on an object at infinity at the wide-angle end is fw. Among the lens groups that move when zooming, the displacement of the lens group with the largest displacement when zooming from the wide-angle end to the telephoto end is Movmax. The unit of Movmax is mm (millimeter).

[0008] When the sum of the distance on the optical axis from the lens surface of the front group closest to the object side to the lens surface of the rear group closest to the image side in a state of focusing on an object at infinity and the back focus at the air conversion distance of the entire system is set as TL, and the maximum image height is set as Y, the zoom lens of the above-mentioned embodiment preferably satisfies the conditional expression (2) represented by the following expression:

[0009] TL / 2Y<80 (2).

[0010] The zoom lens of the above aspect preferably satisfies the conditional formula (1-1) represented by the following formula:

[0011] 0.8<(ft / fw) / Movmax (1-1).

[0012] When the sum of the distance on the optical axis from the lens surface of the front group closest to the object side to the lens surface of the rear group closest to the image side in a state of focusing on an object at infinity and the back focus at the air conversion distance of the entire system is set as TL, the zoom lens of the above-mentioned embodiment preferably satisfies the conditional expression (3) represented by the following expression,

[0013] 2<ft / TL (3).

[0014] When the back focus at the air conversion distance of the entire system is set to Bf, the zoom lens of the above aspect preferably satisfies the conditional expression (4) represented by the following expression:

[0015] 10<ft / Bf (4).

[0016] When the maximum image height is set to Y, the zoom lens of the above aspect preferably satisfies the conditional expression (5) represented by the following expression:

[0017] 30<ft / 2Y (5).

[0018] When the focal length of the lens group closest to the object in the front group is set to fF1, the zoom lens of the above-mentioned embodiment preferably satisfies the conditional expression (6) represented by the following expression:

[0019] 0.5<ft / fF1 (6).

[0020] When the focal length of the lens group closest to the object in the middle group is set to fM1, the zoom lens of the above aspect preferably satisfies the conditional expression (7) represented by the following expression:

[0021] 5<|ft / fM1| (7)

[0022] Preferably, the front lens group closest to the object side includes at least four lenses, and the third lens group from the object side of the rear lens group includes an aspherical lens.

[0023] When the focal length of the rear lens group closest to the object is set to fR1, the zoom lens of the above embodiment preferably satisfies the conditional expression (8) represented by the following expression:

[0024] 0<ft / fR1<100 (8).

[0025] When the focal length of the rear lens group closest to the image side is fRe, the zoom lens of the above aspect preferably satisfies the conditional expression ((9)) represented by the following expression:

[0026] -100<ft / fRe<200(9). In addition, the zoom lens of the above-mentioned embodiment can be configured to satisfy the conditional expression (9-1) represented by the following expression:

[0027] 0<ft / fRe<200(9-1),

[0028] It can also be constructed to satisfy the conditional formula (9-6) represented by the following formula:

[0029] -100<ft / fRe<0(9-6).

[0030] In a configuration in which the zoom lens includes a focus group that moves when focusing, when the lateral magnification of the focus group in a state in which the focus is focused on an object at infinity at the telephoto end is set to βfoc, and when the composite lateral magnification of all lenses closer to the image side than the focus group in a state in which the focus is focused on an object at infinity at the telephoto end is set to βfocR, the zoom lens of the above-described embodiment preferably satisfies conditional equation (10) represented by the following equation:

[0031] |(1-βfoc 2 )×βfocR 2 |<50 (10).

[0032] The front lens group closest to the object side preferably includes at least one cemented lens.

[0033] The front lens group closest to the object side preferably includes at least one positive lens having an Abbe number of 70 or more based on the d-line.

[0034] The front lens group closest to the object side preferably includes at least one negative lens having an Abbe number of 60 or less based on the d-line.

[0035] The lens group closest to the object in the middle group preferably includes at least one positive lens having an Abbe number of 40 or less based on the d-line.

[0036] The lens group closest to the object in the middle group preferably includes at least one positive lens and at least two negative lenses.

[0037] Another aspect of the present invention is an imaging device including the zoom lens of the above aspect.

[0038] In addition, the words "including..." and "including..." in this specification mean that in addition to the listed components, it may also include lenses that essentially have no optical focal length, as well as optical components other than lenses such as diaphragms, filters and cover glasses, as well as mechanical parts such as lens flanges, lens barrels, camera elements and hand-shake correction mechanisms.

[0039] In this specification, “a group of ~ with positive optical power” and “a group of ~ with positive optical power” mean that the group as a whole has positive optical power. Similarly, “a group of ~ with negative optical power” and “a group of ~ with negative optical power” mean that the group as a whole has negative optical power. “A lens with positive optical power” has the same meaning as a “positive lens”. “A lens with negative optical power” has the same meaning as a “negative lens”. The “group of ~” in this specification is not limited to a structure including multiple lenses, but can also be a structure including only one lens.

[0040] A composite aspherical lens (a lens (e.g., a spherical lens) and a film having an aspherical shape formed on the lens are integrated and function as a single aspherical lens as a whole) is used as a single lens and is not considered a cemented lens. Unless otherwise specified, the optical power sign and surface shape related to the lens including an aspherical surface use the optical power sign and surface shape of the paraxial region.

[0041] The "entire system" in this specification refers to the zoom lens. The "back focal length at air conversion distance" is the air conversion distance on the optical axis from the lens surface closest to the image side of the entire system to the image plane. "Single lens" refers to a single lens that is not joined. The "focal length" used in the conditional expressions is the paraxial focal length. Unless otherwise specified, the "distance on the optical axis" used in the conditional expressions is the geometric distance. Unless otherwise specified, the values ​​used in the conditional expressions are the values ​​when the d line is used as the reference when focusing on an object at infinity.

[0042] Effects of the Invention

[0043] According to the present invention, it is possible to provide a zoom lens which is compact, has a high zoom ratio, and maintains excellent optical performance, and an imaging device including the zoom lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a cross-sectional view and a diagram showing a movement trajectory of a zoom lens according to one embodiment corresponding to the zoom lens of Example 1.

[0045] Figure 2 Yes means Figure 1 The diagram is a cross-sectional view of the structure and light beam in each zoom state of the zoom lens, and is a diagram for explaining symbols of conditional expressions.

[0046] Figure 3 1 and 2 are diagrams showing various aberrations of the zoom lens according to Example 1.

[0047] Figure 4 It is a cross-sectional view showing the structure of the zoom lens of Example 2 and a diagram showing a movement trajectory.

[0048] Figure 51 and 1 are diagrams showing various aberrations of the zoom lens according to Example 2.

[0049] Figure 6 It is a cross-sectional view showing the structure of the zoom lens of Example 3 and a diagram showing a movement trajectory.

[0050] Figure 7 It is a diagram showing the structure and light beams of the zoom lens of Example 3 in each zooming state.

[0051] Figure 8 It is a cross-sectional view showing the structure of the zoom lens of Example 4 and a diagram showing a movement trajectory.

[0052] Fig. 9 These are diagrams showing various aberrations of the zoom lens of Example 4.

[0053] Fig.10 It is a cross-sectional view showing the structure of the zoom lens of Example 5 and a diagram showing a movement trajectory.

[0054] Fig.11 These are diagrams showing various aberrations of the zoom lens of Example 5.

[0055] Fig.12 It is a cross-sectional view showing the structure of the zoom lens of Example 6 and a diagram showing a movement trajectory.

[0056] Fig.13 These are various aberration diagrams of the zoom lens of Example 6.

[0057] Fig.14 It is a cross-sectional view showing the structure of the zoom lens of Example 7 and a diagram showing a movement trajectory.

[0058] Fig.15 These are diagrams showing various aberrations of the zoom lens of Example 7.

[0059] Fig.16 It is a cross-sectional view showing the structure of the zoom lens of Example 8 and a diagram showing a movement trajectory.

[0060] Fig.17 These are various aberration diagrams of the zoom lens of Example 8.

[0061] Fig.18 This is a schematic diagram of the structure of an imaging device according to one embodiment.

[0062] Explanation of symbols

[0063] 1-zoom lens, 2-filter, 3-camera element, 5-signal processing unit, 6-display unit, 7-magnification control unit, 8-focus control unit, 100-camera device, GF-front group, GF1-1st front lens group, GF2-2nd front lens group, GM-middle group, GM1-1st middle lens group, GM2-2nd middle lens group, GR-rear group, GR1-1st subsequent lens group, GR2-2nd subsequent lens group, GR3-3rd subsequent lens group, L11~L65-lens, Movmax-displacement, P1-filter, PP-optical component, Sim-image plane, St-aperture stop, Y-maximum image height, Z-optical axis. DETAILED DESCRIPTION

[0064] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0065] exist Figure 1 A cross-sectional view of the structure of a zoom lens according to an embodiment of the present invention is shown in FIG. Figure 1 In FIG. 1 , arrows are written below each group that moves when zooming, indicating the approximate movement trajectory of each group when zooming from the wide-angle end to the telephoto end. Figure 2 It is shown in Figure 1 The cross-sectional view of the structure of the zoom lens also shows a diagram of the light beam. Figure 2 In FIG. 1 , the upper section labeled “Wide” shows the wide-angle end state, and the lower section labeled “Tele” shows the telephoto end state. Figure 2 In FIG. 1 , as light beams, the on-axis light beams and the light beams at the maximum half viewing angle in each state are shown. Figure 1 and Figure 2 The example shown corresponds to the zoom lens of Example 1 described later. Figure 1 and Figure 2 In the figure, the state of focusing on an object at infinity is shown, with the left side being the object side and the right side being the image side. Figure 1 Explain and refer to Figure 2 .

[0066] exist Figure 1 In FIG. 1 , an example is shown in which a parallel flat plate-shaped optical component PP is arranged between the zoom lens and the image plane Sim, assuming that the zoom lens is applied to the image pickup device. The optical component PP is a component assumed to be various filters and / or cover glass. The various filters are low-pass filters, infrared cut-off filters, and / or filters that cut off specific wavelength regions. The optical component PP is a component that does not have optical power. The image pickup device can also be configured by omitting the optical component PP.

[0067] The zoom lens of the present invention includes a front group GF, a middle group GM and a rear group GR in order from the object side to the image side along the optical axis Z. The front group GF includes a lens group with less than 2 positive optical powers. The middle group GM includes a lens group with less than 2 negative optical powers. The rear group GR includes a plurality of lens groups. When changing the magnification, all intervals between adjacent lens groups will change.

[0068] By forming the front group GF with one or two lens groups having positive power, it is easy to lengthen the focal length at the telephoto side. By forming the middle group GM with one or two lens groups having negative power, it is easy to shorten the focal length at the wide-angle end. With the above structure of the front group GF and the middle group GM, it is easy to realize a zoom lens with a high zoom ratio.

[0069] In addition, in this specification, a group whose interval in the optical axis direction changes with adjacent groups when the magnification is changed is referred to as one lens group. When the magnification is changed, the interval between adjacent lenses inside one lens group does not change. That is, the "lens group" is a component of the zoom lens, and is a part that includes at least one lens separated by an air gap that changes when the magnification is changed. When the magnification is changed, each lens group unit is moved or fixed. In addition, the "lens group" may also include components other than lenses that do not have optical focal length, for example, an aperture stop St, etc.

[0070] In the zoom lens of the present invention, the lens group closest to the object side of the front group GF is fixed relative to the image plane Sim when the zoom is changed. By making the lens group closest to the object side of the zoom lens fixed when the zoom is changed, the total length of the lens system does not change when the zoom is changed, so it is easy to put the zoom lens into a housing. In addition, when set outdoors, even if it is placed in a waterproof case, it is easy to shoot from the telephoto end to the wide-angle end without vignetting.

[0071] Furthermore, in the zoom lens of the present invention, the lens group closest to the image side of the rear group GR is fixed relative to the image plane Sim when the zoom is changed. By configuring in this way, it is possible to manufacture without greatly changing the way the light passes through the rear group GR, so it is easy to set stable performance from the wide angle end to the telephoto end. Furthermore, by configuring the lens group closest to the image side of the rear group GR to be fixed when the zoom is changed, it is easy to prevent dust and the like from intruding into the interior of the zoom lens.

[0072] As an example, Figure 1Each group of the zoom lens shown is constructed as follows. The front group GF includes a lens group with one positive optical power. The middle group GM includes a lens group with one negative optical power. The rear group GR includes three lens groups, namely, the first subsequent lens group GR1 with positive optical power, the second subsequent lens group GR2 with negative optical power, and the third subsequent lens group GR3 with positive optical power, from the object side to the image side. When changing the magnification, the front group GF and the third subsequent lens group GR3 are fixed relative to the image plane Sim, and the middle group GM, the first subsequent lens group GR1 and the second subsequent lens group GR2 change the intervals with the adjacent lens groups and move along the optical axis Z. By setting the structure as described above, a high-performance zoom lens can be made, which is compact and corrects various aberrations in the entire zoom range although the focal length at the telephoto end is sufficiently lengthened.

[0073] And, as an example, the composition Figure 1 The elements of each lens group are as follows. The lens group constituting the front group GF includes five lenses, namely lenses L11 to L15, in order from the object side to the image side. The lens group constituting the middle group GM includes three lenses, namely lenses L21 to L23, in order from the object side to the image side. The first subsequent lens group GR1 includes two lenses, namely lenses L31 to L32, in order from the object side to the image side. The second subsequent lens group GR2 includes three lenses, namely lenses L41 to L43, in order from the object side to the image side. The third subsequent lens group GR3 includes twelve lenses, namely aperture stop St and lenses L51 to L62, in order from the object side to the image side. In addition, Figure 1 The aperture stop St shown does not indicate the size or shape but indicates the position in the optical axis direction.

[0074] Figure 1 The zoom lens includes a focus group that moves when focusing. Hereinafter, the group that moves along the optical axis Z when focusing is referred to as the focus group. Focusing is performed by moving the focus group. As an example, in Figure 1 In the example of , the focus group includes three lenses, namely, lenses L57 to L59, of the third subsequent lens group GR3. Figure 1 In FIG. 1 , a double arrow pointing left and right is written together with brackets below the lens corresponding to the focus group.

[0075] and, Figure 1 The zoom lens includes an anti-vibration group that moves when correcting image shake. Hereinafter, the group that moves in a direction intersecting the optical axis Z when correcting image shake is referred to as an anti-vibration group. Image shake correction is performed by moving the anti-vibration group. As an example, in Figure 1 In the example of , the anti-vibration group includes four lenses, namely, lenses L52 to L55 of the third subsequent lens group GR3. Figure 1 In FIG. 1 , a double arrow in the up-down direction is written together with brackets below the lens corresponding to the anti-vibration group.

[0076] The lens group closest to the object side of the front group GF preferably has positive refractive power. In this case, although it is a telephoto type optical system, it is easy to be configured in a small size.

[0077] The lens group closest to the object side of the front group GF preferably includes at least 2 lenses. By using 2 or more lenses in the lens group closest to the object side of the front group GF, chromatic aberration correction becomes easier, which is conducive to high resolution. More preferably, the lens group closest to the object side of the front group GF includes at least 4 lenses. By using 4 or more lenses in the lens group closest to the object side of the front group GF, chromatic aberration correction becomes easier, which is more conducive to high resolution.

[0078] The lens group closest to the object side of the front group GF preferably includes at least two positive lenses. In this case, the positive refractive power of the lens group closest to the object side of the front group GF can be easily enhanced, which is conducive to miniaturization.

[0079] The lens group closest to the object side of the front group GF preferably includes at least one positive lens having a d-line-based Abbe number of not less than 70. In this case, chromatic aberration can be easily corrected, which is advantageous for achieving high resolution.

[0080] The lens group closest to the object side of the front group GF preferably includes at least one negative lens. In this case, chromatic aberration correction becomes easy, which is advantageous for high resolution.

[0081] The lens group closest to the object side of the front group GF preferably includes at least one negative lens having an Abbe number of 60 or less based on the d line. In this case, correction of chromatic aberration becomes easy, which is conducive to high resolution. More preferably, the lens group closest to the object side of the front group GF includes at least one negative lens having an Abbe number of 40 or less based on the d line. In this case, correction of chromatic aberration becomes easier, which is more conducive to high resolution.

[0082] The lens group closest to the object side of the front group GF preferably includes at least two positive lenses and at least two negative lenses. In this case, chromatic aberration correction becomes easy, which is advantageous for high resolution.

[0083] The lens group closest to the object side of the front group GF preferably includes at least one cemented lens. In this case, chromatic aberration correction becomes easy, which is advantageous for high resolution.

[0084] The lens group closest to the object side of the front group GF may be configured to include two cemented lenses. In this case, it is advantageous to correct axial chromatic aberration.

[0085] The lens group closest to the object of the front group GF preferably includes a single lens having positive refractive power on the closest object side. In this case, it is advantageous for a longer focal length and a smaller size.

[0086] The lens group closest to the object side of the front group GF preferably includes an aspherical lens. In this case, it is advantageous to correct various aberrations, and thus advantageous to achieve high resolution.

[0087] When the lens group closest to the object side of the front group GF includes an aspherical lens, the Abbe number of the aspherical lens based on the d line is preferably not less than 40. In this case, chromatic aberration correction becomes easy, which is advantageous for high resolution.

[0088] The second lens group from the object side of the front group GF is preferably moved during zooming. In this case, it is advantageous to realize a zoom lens with a high zoom ratio.

[0089] The second lens group from the object side of the front group GF preferably has positive refractive power. In this case, the light beam can be converged, which is advantageous in shortening the total length of the lens system.

[0090] The second lens group from the object side of the front group GF may be configured to include one lens. In this case, it is advantageous to achieve lightweight and rapid zooming. In the case where the second lens group from the object side of the front group GF includes one lens, the lens may be configured to be a positive lens. In this case, it is advantageous to suppress aberration changes during zooming and compactly configure the zoom lens.

[0091] The lens group closest to the object side of the front group GF may have a concave lens surface closest to the image side, and the lens group closest to the object side of the middle group GM may have a convex lens surface closest to the object side. In this case, it is easy to correct astigmatism and distortion well on the telephoto side.

[0092] The lens group closest to the object side of the middle group GM preferably has negative refractive power and moves during zooming. In this case, a zoom lens with a high zoom ratio is easily realized.

[0093] The lens group closest to the object side of the middle group GM preferably includes at least three lenses. In this case, chromatic aberration correction becomes easy, which is conducive to high resolution. In addition, since each lens can share the optical power, it is easy to correct each aberration well.

[0094] The lens group closest to the object in the middle group GM preferably includes at least one positive lens and at least two negative lenses. By configuring the lens group to include a positive lens and a negative lens in combination, various monochromatic aberrations and chromatic aberrations can be corrected easily and satisfactorily.

[0095] The lens group closest to the object side of the middle group GM preferably includes a plurality of negative lenses. In this case, compared with the case where the lens group closest to the object side of the middle group GM does not include a plurality of negative lenses, the optical power of each negative lens can be weakened, so it is easy to reduce the error sensitivity to decentering, thereby easily improving manufacturability.

[0096] The lens group closest to the object in the middle group GM preferably includes a plurality of negative lenses, at least one of which is cemented with a positive lens to form a cemented lens. By combining positive and negative lenses, various monochromatic aberrations and chromatic aberrations can be corrected well.

[0097] The lens group closest to the object side of the middle group GM preferably includes at least one positive lens having an Abbe number of 40 or less based on the d-line. In this case, correction of chromatic aberration becomes easy, which is conducive to high resolution. More preferably, the lens group closest to the object side of the middle group GM includes at least one positive lens having an Abbe number of 25 or less based on the d-line. In this case, correction of chromatic aberration becomes easier, which is more conducive to high resolution.

[0098] The lens group closest to the object side of the middle group GM preferably includes at least one cemented lens. In this case, correction of various monochromatic aberrations and chromatic aberrations becomes easy, which is advantageous for achieving high resolution.

[0099] The lens group closest to the object side of the middle group GM preferably includes an aspherical lens. In this case, it is advantageous to correct various aberrations and thus advantageous to achieve high resolution.

[0100] When the lens group closest to the object side of the middle group GM includes an aspherical lens, the Abbe number of the aspherical lens based on the d line is preferably not more than 40. In this case, correction of chromatic aberration becomes easy, which is advantageous for achieving high resolution.

[0101] The lens closest to the object in the lens group closest to the object in the middle group GM may be a positive lens. In this case, it is advantageous to prevent the diameter of the middle group GM from increasing.

[0102] The Abbe number of the lens closest to the object side of the lens group closest to the object side of the middle group GM based on the d-line is preferably not more than 25. In this case, it is advantageous to correct chromatic aberration.

[0103] The lens closest to the image side of the lens group closest to the object side of the middle group GM may be configured as an aspherical lens. In this case, it is advantageous to correct various aberrations, and thus advantageous to achieve high resolution.

[0104] The aspherical lens of the lens group closest to the object in the middle group GM is preferably a negative lens. In this case, spherical aberration and field curvature can be easily corrected.

[0105] The object-side surface of the lens closest to the image side in the lens group closest to the object side of the middle group GM is preferably a concave surface. In this case, spherical aberration and field curvature are easily corrected.

[0106] The second lens group from the object side of the rear group GR may also be configured as a vibration-proof group in its entirety or in part. Among the lens groups included in the zoom lens, since the second lens group from the object side of the middle group GM is relatively small, this group is provided with a vibration-proof function, thereby making it easy to miniaturize the vibration-proof mechanism.

[0107] The lens group closest to the object in the rear group GR is configured to have positive refractive power, thereby making it easy to reduce the lens diameter of the rear group GR.

[0108] The lens group closest to the object side of the rear group GR can also be configured to move when the magnification is changed. In this case, the change of spherical aberration when the magnification is changed can be suppressed, which is conducive to high performance. In the case where the lens group closest to the object side of the rear group GR is configured to have positive focal power and move when the magnification is changed, it is easy to achieve miniaturization of the lens system and it is conducive to correcting the image position deviation when the magnification is changed.

[0109] The lens group closest to the object side of the rear group GR may also be configured to be fixed relative to the image plane Sim during zooming. In this case, compared with a structure in which the lens group moves during zooming, the number of groups that move during zooming can be reduced, so it is easy to improve robustness.

[0110] The lens group closest to the object side of the rear group GR preferably includes a plurality of positive lenses. In this case, compared with the case where the lens group closest to the object side of the rear group GR does not include a plurality of positive lenses, the optical power of each positive lens can be weakened, so it is easy to reduce the error sensitivity to decentering, thereby making it easy to improve manufacturability.

[0111] The lens group closest to the object side of the rear group GR preferably includes at least three positive lenses and at least one negative lens. By configuring the lens group to include a combination of positive lenses and negative lenses, it is easy to correct various monochromatic aberrations and chromatic aberrations well.

[0112] The lens group closest to the object side of the rear group GR preferably includes at least one cemented lens. In this case, it is advantageous to correct chromatic aberration.

[0113] The lens group closest to the object side of the rear group GR preferably includes at least one negative lens having an Abbe number of 35 or less based on the d-line. In this case, it is advantageous to correct chromatic aberration.

[0114] The lens group closest to the object side of the rear group GR preferably includes an aspherical lens. In this case, it is advantageous to correct various aberrations, and thus advantageous to achieve high resolution.

[0115] The aspherical lens of the lens group closest to the object in the rear group GR is preferably a positive lens. In this case, spherical aberration can be easily corrected well.

[0116] The lens closest to the image side of the lens group closest to the object side of the rear group GR may be a positive lens. In this case, it is easier to prevent the diameter of the lens group on the image side from being larger than the positive lens, which is conducive to miniaturization.

[0117] The Abbe number of the lens closest to the image side of the lens group closest to the object side of the rear group GR may be greater than or equal to 80 based on the d-line. In this case, it is advantageous to correct chromatic aberration.

[0118] The image side surface of the lens closest to the image side of the lens group closest to the object side of the rear group GR may be convex. In this case, it is easier to prevent the diameter of the lens group on the image side from being larger than the lens, which is conducive to miniaturization.

[0119] The second lens group from the object side of the rear group GR may also be configured to have negative power and move when zooming. By configuring the second lens group from the object side of the rear group GR to have negative power, the light beam emitted from the group can be configured to be divergent light, thereby making it easy to correct spherical aberration in the group closer to the image side than the group. Furthermore, by configuring the second lens group from the object side of the rear group GR to move when zooming, it is beneficial to correct the image position shift when zooming.

[0120] When zooming from the wide-angle end to the telephoto end, the second lens group from the object side of the rear group GR is preferably moved from the object side to the image side. In this case, the moving direction of the second lens group from the object side of the rear group GR during zooming can be set to be the same as the moving direction of the middle group GM, so it is easy to ensure the required movement amount, and as a result, it is easy to shorten the total length of the lens system.

[0121] The second lens group from the object side of the rear group GR preferably includes an aspherical lens. In this case, it is advantageous to correct various aberrations, and thus advantageous to achieve high resolution.

[0122] The aspherical lens of the second lens group from the object side of the rear group GR is preferably a negative lens. The negative lens has the function of diverging the light beam, so when the focusing group is composed of the negative lens or a lens closer to the image side than the negative lens, it is easy to ensure the movement amount during focusing.

[0123] The third lens group from the object side of the rear group GR preferably includes an aspherical lens. In this case, it is advantageous to correct various aberrations, and thus advantageous to achieve high resolution.

[0124] The lens group closest to the image side of the rear group GR may also be configured to have positive refractive power. In this case, the lens group closest to the image side of the rear group GR can have a light-gathering effect, which is advantageous for miniaturization.

[0125] The lens group closest to the image side of the rear group GR may also be configured to have negative refractive power. In this case, it is beneficial to ensure the back focus and to reduce the refractive power of the lens group that moves when changing the magnification, thereby helping to suppress the aberration change when changing the magnification.

[0126] It is also possible to configure so that part of the lens group closest to the image side of the rear group GR is a focus group. In this case, the focus group can be made lightweight, so it is easy to perform focusing at high speed.

[0127] The focus group may be configured to be included in a lens group fixed relative to the image plane Sim during zooming in the rear group GR. In this case, the structure becomes simpler than when included in a lens group that moves during zooming, which is conducive to improving the accuracy of position control.

[0128] Alternatively, the focus group may be configured as a lens group that moves when the focus group is included in the rear group GR. In this case, compared with the case where the focus group is included in a lens group that is fixed relative to the image plane Sim when the focus group is changed, the number of moving groups can be reduced, so the mechanical structure becomes simple, which is conducive to the miniaturization of the device.

[0129] The lens group in the rear group GR that is fixed relative to the image plane Sim during zooming may be configured to have negative refractive power. In this case, it is advantageous to ensure a back focus.

[0130] The lens group fixed relative to the image plane Sim during zooming in the rear group GR can be constructed to include, from the object side to the image side, a first partial group fixed relative to the image plane Sim during focusing, a second partial group moving along the optical axis Z during focusing, and a third partial group fixed relative to the image plane Sim during focusing. The second partial group is a focusing group. In the above structure, when the first partial group has a negative optical focal power, the second partial group has a positive optical focal power, and the third partial group has a negative optical focal power, it is beneficial to ensure the back focal length and suppress the aberration variation during focusing. Alternatively, when the first partial group has a positive optical focal power, the second partial group has a negative optical focal power, and the third partial group has a positive optical focal power, although it is compactly constructed, it is beneficial to suppress the aberration variation during focusing.

[0131] In the case of a focusing group including a lens group having negative power that is fixed relative to the image plane Sim during zooming in the rear group GR, the average refractive index of all lenses included in the focusing group relative to the d-line is preferably greater than 1.8. In this case, it is advantageous to suppress aberration fluctuations during focusing.

[0132] The focus group may be any one of the lens group closest to the object side of the rear group GR, the second lens group from the object side of the rear group GR, and the lens group closest to the image side of the rear group GR, or may be only a part of any one of these lens groups. In this case, compared with the case where the focus group is configured in the front group GF, it is possible to achieve miniaturization and lightness, which is conducive to high-speed focusing.

[0133] A portion of the lens group closest to the image side of the rear group GR can be configured as an anti-vibration group. Since the lens group closest to the image side of the rear group GR is small among the lens groups included in the zoom lens, the anti-vibration function is provided to the group, thereby making it easy to miniaturize the anti-vibration mechanism.

[0134] The aperture stop St is preferably disposed in the rear group GR. In this case, the aperture stop St is disposed at a position relatively close to the image side in the zoom lens, so that it is easy to separate the on-axis light beam and the peripheral off-axis light beam closer to the object side than the aperture stop St. Thus, it is easy to suppress astigmatism at the wide-angle end.

[0135] It is preferred to continuously configure two positive lenses closer to the image side than the aperture stop St. In this case, it is easy to correct spherical aberration well. It is more preferred to continuously configure three positive lenses closer to the image side than the aperture stop St. In this case, it is easier to correct spherical aberration well.

[0136] Next, the preferred structure and possible structure related to the conditional formula of the zoom lens of the present invention are described. In addition, in the description related to the following conditional formula, in order to avoid redundant description, the same symbols are used for the parts with the same definition, and the repeated description of some symbols is omitted. And, in order to avoid redundant description, the "zoom lens of the present invention" is also referred to as "zoom lens" in short.

[0137] The zoom lens preferably satisfies the following conditional expression (1). Here, the focal length of the entire system in a state where the zoom is focused on an object at infinity at the telephoto end is set to ft. The focal length of the entire system in a state where the zoom is focused on an object at infinity at the wide-angle end is set to fw. The displacement of the lens group with the largest displacement when changing magnification from the wide-angle end to the telephoto end among the lens groups that move when changing magnification is set to Movmax. That is, when the lens group with the largest displacement when changing magnification from the wide-angle end to the telephoto end among the lens groups that move when changing magnification is called the maximum displacement lens group, Movmax is the distance on the optical axis between the position of the maximum displacement lens group at the wide-angle end and the position of the maximum displacement lens group at the telephoto end. Figure 1 In the example, the maximum shift lens group is the second subsequent lens group GR2. Figure 2The displacement amount Movmax is shown in . The unit of Movmax is mm (millimeter). By making the corresponding value of conditional expression (1) not less than the lower limit value, a high zoom ratio can be achieved while being easily configured in a compact size.

[0138] 0.4<(ft / fw) / Movmax (1)

[0139] In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (1-1). Furthermore, the zoom lens preferably satisfies the following conditional formula (1-2). By making the corresponding value of conditional formula (1-2) not exceed the upper limit value, Movmax will not become too small, so it is easy to perform precise zoom control. In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (1-3), further preferably satisfies the following conditional formula (1-4), and further preferably satisfies the following conditional formula (1-5).

[0140] 0.8<(ft / fw) / Movmax (1-1)

[0141] 0.55<(ft / fw) / Movmax<10 (1-2)

[0142] 0.7<(ft / fw) / Movmax<5 (1-3)

[0143] 0.8<(ft / fw) / Movmax<4 (1-4)

[0144] 1<(ft / fw) / Movmax<3 (1-5)

[0145] The zoom lens preferably satisfies the following conditional expression (2). Here, the sum of the distance on the optical axis from the lens surface of the front group GF closest to the object side to the lens surface of the rear group GR closest to the image side in the state of focusing on an infinitely distant object and the back focal length of the entire system in air conversion distance is TL. The maximum image height is Y. As an example, in Figure 2 The maximum image height Y is shown in . In addition, TL is the total length of the lens system. By making the corresponding value of conditional expression (2) not exceed the upper limit value, miniaturization becomes easy, and the maximum image height Y does not become too small, so it is easy to achieve high resolution.

[0146] TL / 2Y<80 (2)

[0147] In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (2-1). By making the corresponding value of conditional formula (2-1) not be less than the lower limit, TL will not become too small, so it is easy to increase the zoom ratio. In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (2-2), further preferably satisfies the following conditional formula (2-3), and further preferably satisfies the following conditional formula (2-4).

[0148] 30<TL / 2Y<78 (2-1)

[0149] 40<TL / 2Y<75 (2-2)

[0150] 45<TL / 2Y<70 (2-3)

[0151] 55<TL / 2Y<68 (2-4)

[0152] The zoom lens preferably satisfies the following conditional expression (3). By making the corresponding value of conditional expression (3) not less than the lower limit value, it is possible to prevent TL from becoming excessively long, thereby facilitating miniaturization.

[0153] 2<ft / TL (3)

[0154] In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (3-1). By making the corresponding value of conditional formula (3-1) not exceed the upper limit value, TL does not become too small, so it is easy to suppress the sensitivity of manufacturing errors from becoming higher. In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (3-2), further preferably satisfies the following conditional formula (3-3), and further preferably satisfies the following conditional formula (3-4).

[0155] 2.2<ft / TL<5 (3-1)

[0156] 2.4<ft / TL<4.5 (3-2)

[0157] 2.5<ft / TL<4 (3-3)

[0158] 2.8<ft / TL<3.5 (3-4)

[0159] The zoom lens preferably satisfies the following conditional expression (4). Here, the back focus of the entire system at the air conversion distance is set to Bf. By making the corresponding value of conditional expression (4) not less than the lower limit value, it is advantageous for miniaturization and telephoto.

[0160] 10<ft / Bf (4)

[0161] In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (4-1). By making the corresponding value of conditional formula (4-1) not exceed the upper limit value, the back focus will not become too small, so it is easy to configure an imaging element that captures the image formed by the zoom lens. In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (4-2), and further preferably satisfies the following conditional formula (4-3).

[0162] 30<ft / Bf<300 (4-1)

[0163] 40<ft / Bf<200 (4-2)

[0164] 50<ft / Bf<150 (4-3)

[0165] The zoom lens preferably satisfies the following conditional expression (5). By making the corresponding value of conditional expression (5) not less than the lower limit value, the maximum image height Y does not become too large, which is advantageous for miniaturization and telephoto.

[0166] 30<ft / 2Y (5)

[0167] In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (5-1). By making the corresponding value of conditional formula (5-1) not exceed the upper limit value, it is easy to increase the size of the image pickup element that captures the image formed by the zoom lens, which is conducive to high resolution. In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (5-2), and further preferably satisfies the following conditional formula (5-3).

[0168] 50<ft / 2Y<300 (5-1)

[0169] 70<ft / 2Y<200 (5-2)

[0170] 80<ft / 2Y<150 (5-3)

[0171] The zoom lens preferably satisfies the following conditional expression (6). Here, the focal length of the lens group closest to the object side of the front group GF is set to fF1. By making the corresponding value of conditional expression (6) not less than the lower limit value, it is easy to enhance the optical power of the lens group closest to the object side of the front group GF, which is conducive to miniaturization and telephoto.

[0172] 0.5<ft / fF1 (6)

[0173] In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (6-1). By making the corresponding value of conditional formula (6-1) not exceed the upper limit value, the optical power of the lens group closest to the object side of the front group GF will not become too strong, so it is easy to suppress the sensitivity of manufacturing errors from becoming higher. In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (6-2), and further preferably satisfies the following conditional formula (6-3).

[0174] 1<ft / fF1<16 (6-1)

[0175] 2<ft / fF1<13 (6-2)

[0176] 3.5<ft / fF1<10 (6-3)

[0177] The zoom lens preferably satisfies the following conditional expression (7). Here, the focal length of the lens group closest to the object side of the middle group GM is set to fM1. By making the corresponding value of conditional expression (7) not less than the lower limit value, it is easy to enhance the optical power of the lens group closest to the object side of the middle group GM, which is conducive to miniaturization and telephoto.

[0178] 5<|ft / fM1| (7)

[0179] In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (7-1). By making the corresponding value of conditional formula (7-1) not exceed the upper limit value, the optical power of the lens group closest to the object side of the middle group GM does not become too strong, so it is easy to suppress the sensitivity of manufacturing errors from becoming higher. In order to obtain better characteristics, the zoom lens more preferably satisfies the following conditional formula (7-2), further preferably satisfies the following conditional formula (7-3), and further preferably satisfies the following conditional formula (7-4).

[0180] 10<|ft / fM1|<90 (7-1)

[0181] 20<|ft / fM1|<75 (7-2)

[0182] 30<|ft / fM1|<60 (7-3)

[0183] 33<|ft / fM1|<55 (7-4)

[0184] The zoom lens preferably satisfies the following conditional expression (8). Here, the focal length of the lens group closest to the object side of the rear group GR is set to fR1. In the zoom lens of the present invention, the lens group closest to the object side of the rear group GR has positive optical focal length, so the lower limit of the conditional expression (8) becomes "0 <". By making the corresponding value of the conditional expression (8) not be greater than the upper limit value, the optical focal length of the lens group closest to the object side of the rear group GR will not become too strong, so it is easy to suppress the sensitivity of manufacturing errors from becoming high. As a result, it is easy to maintain good manufacturability, which is conducive to realizing the zoom lens of the present invention.

[0185] 0<ft / fR1<100 (8)

[0186] In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (8-1). By making the corresponding value of conditional formula (8-1) not less than the lower limit value, it is easy to enhance the optical power of the lens group closest to the object side of the rear group GR, which is conducive to miniaturization. In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (8-2), further preferably satisfies the following conditional formula (8-3), and further preferably satisfies the following conditional formula (8-4).

[0187] 1<ft / fR1<70 (8-1)

[0188] 3<ft / fR1<50 (8-2)

[0189] 5<ft / fR1<45 (8-3)

[0190] 7<ft / fR1<40 (8-4)

[0191] The zoom lens preferably satisfies the following conditional expression (9). Here, the focal length of the lens group closest to the image side of the rear group GR is set to fRe. By making the corresponding value of conditional expression (9) not less than the lower limit value, the negative focal power of the lens group closest to the image side of the rear group GR will not become too strong, so it is easy to suppress the sensitivity of manufacturing errors from becoming high. By making the corresponding value of conditional expression (9) not more than the upper limit value, the positive focal power of the lens group closest to the image side of the rear group GR will not become too strong, so it is easy to suppress the sensitivity of manufacturing errors from becoming high. By satisfying conditional expression (9), it is easy to maintain good manufacturability, which is conducive to realizing the zoom lens of the present invention.

[0192] -100<ft / fRe<200 (9)

[0193] According to the above conditional formula (9), when the lens group closest to the image side of the rear group GR has positive optical power, the zoom lens preferably satisfies the following conditional formula (9-1). In order to obtain better characteristics, the zoom lens more preferably satisfies the following conditional formula (9-2). By making the corresponding value of conditional formula (9-2) not less than the lower limit value, it is easy to enhance the optical power of the lens group closest to the image side of the rear group GR, which is conducive to miniaturization. In order to obtain better characteristics, the zoom lens more preferably satisfies the following conditional formula (9-3), further preferably satisfies the following conditional formula (9-4), and further preferably satisfies the following conditional formula (9-5).

[0194] 0<ft / fRe<200 (9-1)

[0195] 10<ft / fRe<100 (9-2)

[0196] 20<ft / fRe<80 (9-3)

[0197] 25<ft / fRe<60 (9-4)

[0198] 30<ft / fRe<50 (9-5)

[0199] Furthermore, according to the above-mentioned conditional formula (9), when the lens group closest to the image side of the rear group GR has negative optical power, the zoom lens preferably satisfies the following conditional formula (9-6). In order to obtain better characteristics, the zoom lens more preferably satisfies the following conditional formula (9-7). By making the corresponding value of the conditional formula (9-7) not be greater than the upper limit value, it is easy to enhance the optical power of the lens group closest to the image side of the rear group GR, which is conducive to ensuring the back focal length. In order to obtain better characteristics, the zoom lens more preferably satisfies the following conditional formula (9-8), further preferably satisfies the following conditional formula (9-9), and further preferably satisfies the following conditional formula (9-10).

[0200] -100<ft / fRe<0 (9-6)

[0201] -50<ft / fRe<-0.5 (9-7)

[0202] -30<ft / fRe<-1 (9-8)

[0203] -20<ft / fRe<-1.5 (9-9)

[0204] -10<ft / fRe<-2 (9-10).

[0205] In a structure in which the zoom lens includes a focus group, the zoom lens preferably satisfies the following conditional expression (10). Here, the lateral magnification of the focus group in a state of focusing on an object at infinity at the telephoto end is set to βfoc. The composite lateral magnification of all lenses closer to the image side of the focus group in a state of focusing on an object at infinity at the telephoto end is set to βfocR. In a case where there is no lens at a position closer to the image side than the focus group, βfocR is set to 1. By making the corresponding value of conditional expression (10) not exceed the upper limit value, the movement amount of the image per unit movement amount of the focus group can be reduced, so that precise focusing is easy.

[0206] |(1-βfoc 2 )×βfocR 2 |<50 (10)

[0207] In order to obtain better characteristics, the zoom lens preferably satisfies the following conditional formula (10-1), further preferably satisfies the following conditional formula (10-2), further preferably satisfies the following conditional formula (10-3), and further preferably satisfies the following conditional formula (10-4).

[0208] 0<|(1-βfoc 2 )×βfocR 2 |<20 (10-1)

[0209] 0<|(1-βfoc 2 )×βfocR 2 |<10 (10-2)

[0210] 0<|(1-βfoc 2 )×βfocR 2 |<8 (10-3)

[0211] 0<|(1-βfoc 2 )×βfocR 2 |<6 (10-4)

[0212] The zoom lens preferably satisfies the following conditional expression (11). Here, the lens group on the object side of the middle group GM is referred to as the first intermediate lens group. The lateral magnification of the first intermediate lens group in the state of focusing on an object at infinity at the telephoto end is set to βM1. The composite lateral magnification of all lenses on the image side of the first intermediate lens group in the state of focusing on an object at infinity at the telephoto end is set to βM1R. By making the corresponding value of the conditional expression (11) not be less than the lower limit value, miniaturization is facilitated. By making the corresponding value of the conditional expression (11) not be more than the upper limit value, the movement amount of the image per unit movement amount of the first intermediate lens group will not become too large, so it is easy to prevent the manufacturing difficulty from becoming higher.

[0213] 10<|(1-βM1 2 )×βM1R 2 |<100 (11)

[0214] In addition, when the middle group GM includes only one lens group, the middle group GM becomes a first middle lens group.

[0215] In order to obtain better characteristics, the zoom lens more preferably satisfies the following conditional formula (11-1), further preferably satisfies the following conditional formula (11-2), and further preferably satisfies the following conditional formula (11-3).

[0216] 20<|(1-βM1 2 )×βM1R 2 |<90 (11-1)

[0217] 30<|(1-βM1 2 )×βM1R 2 |<80 (11-2)

[0218] 40<|(1-βM1 2 )×βM1R 2 |<70 (11-3)

[0219] in addition, Figure 1 The example shown is only an example, and various modifications can be made without departing from the technical spirit of the present invention. For example, the number of lens groups included in each of the front group GF, the middle group GM, and the rear group GR can also be set to the same number as Figure 1 Furthermore, the number of lenses included in each lens group, the number of lenses included in the focus group, and the number of lenses included in the anti-vibration group may also be set to be different from the number of lenses included in the focus group. Figure 1 The lens corresponding to the focus group, the lens corresponding to the anti-vibration group, the position of the aperture stop St, and the lens group that moves when changing the magnification can also be configured as Figure 1 The examples are different.

[0220] Furthermore, at least one of an infrared cut filter, a visible light cut filter, a filter that transmits only light of a specific wavelength, an ND (Neutral Density) filter, and a polarization filter may be disposed at any position of the zoom lens.

[0221] The above-mentioned preferred structures and possible structures can be arbitrarily combined within the scope of no contradiction, and are preferably appropriately and selectively adopted according to the required specifications.

[0222] As an example, in a preferred embodiment of the zoom lens of the present invention, the front group GF, the middle group GM and the rear group GR are included in sequence from the object side to the image side, the front group GF includes no more than two lens groups with positive optical focal length, the lens group of the front group GF closest to the object side is fixed relative to the image plane Sim when the magnification is changed, the middle group GM includes no more than two lens groups with negative optical focal length, the rear group GR includes multiple lens groups, the lens group of the rear group GR closest to the object side has positive optical focal length, the lens group of the rear group GR closest to the image side is fixed relative to the image plane Sim when the magnification is changed, and when the magnification is changed, all intervals between adjacent lens groups change and satisfy the above-mentioned conditional formula (1).

[0223] Next, embodiments of the zoom lens of the present invention are described with reference to the accompanying drawings. In addition, the reference symbols marked on each lens and each group in the cross-sectional view of each embodiment are used independently in each embodiment to avoid the complication of the description and drawings caused by the increase in the number of digits of the reference symbols. Therefore, even if the same reference symbols are marked in the drawings of different embodiments, they are not necessarily the same structure.

[0224] [Example 1]

[0225] The structure and movement trajectory of the zoom lens of Example 1 are shown in Figure 1 , and its illustration method and structure are as described above, so part of the repeated description is omitted here. The zoom lens of Example 1 includes a front group GF, a middle group GM, and a rear group GR in sequence from the object side to the image side. The front group GF includes one lens group with positive focal power. The middle group GM includes one lens group with negative focal power. The rear group GR includes three lens groups, namely, a first subsequent lens group GR1 with positive focal power, a second subsequent lens group GR2 with negative focal power, and a third subsequent lens group GR3 with positive focal power, in sequence from the object side to the image side. When changing the magnification from the wide-angle end to the telephoto end, the front group GF and the third subsequent lens group GR3 are fixed relative to the image plane Sim, and the middle group GM, the first subsequent lens group GR1, and the second subsequent lens group GR2 change the intervals between the adjacent lens groups and move along the optical axis Z.

[0226] Regarding the zoom lens of Example 1, basic lens data are shown in Table 1, specifications are shown in Table 2, variable surface intervals are shown in Table 3, and aspheric surface coefficients are shown in Table 4.

[0227] The table of basic lens data is as follows. The Sn column shows the face number when the face closest to the object side is set as the first face and the face number increases one by one toward the image side. The R column shows the radius of curvature of each face. The D column shows the face spacing on the optical axis between each face and the face adjacent to the image side. The Nd column shows the refractive index of each lens with respect to the d-line. The νd column shows the Abbe number of each lens based on the d-line.

[0228] The "d line", "C line", and "F line" described in this specification are clear lines, and the wavelength of the d line is considered to be 587.56 nm (nanometers), the wavelength of the C line is considered to be 656.27 nm (nanometers), and the wavelength of the F line is considered to be 486.13 nm (nanometers).

[0229] In the table of basic lens data, the sign of the radius of curvature of the surface that makes the convex shape face the object side is set to positive, and the sign of the radius of curvature of the surface that makes the convex shape face the image side is set to negative. Table 1 also shows the aperture stop St and the optical component PP. The surface number and the term (St) are recorded in the surface number column corresponding to the aperture stop St. The value at the bottom of column D in the table is the interval between the surface closest to the image side in the table and the image plane Sim. Regarding the variable surface interval when changing magnification, the symbol DD[] is used, and the surface number on the object side of the interval is marked in [] and recorded in column D.

[0230] In Table 2, the zoom ratio Zr, focal length f, back focal length Bf at air conversion distance, open F value FNo., maximum total angle of view 2ω, and maximum image height Y are shown based on the d-line. The zoom ratio has the same meaning as the zoom factor. The [°] in the 2ω column indicates the unit is degree. In Table 2, the columns marked "Wide" and "Tele" respectively show the values ​​of the wide-angle end state and the telephoto end state.

[0231] Table 3 shows the variable surface intervals when zooming. In Table 3, the columns labeled "Wide" and "Tele" show the values ​​for the wide-angle end state and the telephoto end state, respectively.

[0232] In the basic lens data, the surface number of the aspheric surface is marked with an * mark, and the value of the paraxial curvature radius is recorded in the curvature radius column of the aspheric surface. In Table 4, the surface number of the aspheric surface is shown in the Sn row, and the numerical values ​​of the aspheric coefficients of each aspheric surface are shown in the KA and Am rows. In addition, m in Am is an integer greater than 3 and varies depending on the surface. For example, in the 11th surface of Example 1, m=3, 4, 5, ... 20. The numerical values ​​of the aspheric coefficients in Table 4 are "E±n" (n: integer) means "×10 ±n KA and Am are aspherical coefficients in the aspherical formula represented by the following formula.

[0233] Zd=C×h 2 / {1+(1-KA×C 2 ×h 2 ) 1 / 2}+∑Am×h m

[0234] in,

[0235] Zd: depth of aspheric surface (the length of the perpendicular line from a point on the aspheric surface at height h to a plane tangent to the vertex of the aspheric surface and perpendicular to the optical axis Z);

[0236] h: height (the distance from the optical axis Z to the lens surface);

[0237] C: the reciprocal of the paraxial curvature radius;

[0238] KA, Am: Aspheric coefficients,

[0239] The ∑ of the aspherical type is the sum related to m.

[0240] In the data of each table, degrees are used as the unit of angle and millimeters are used as the unit of length. Since the optical system can be used at either a magnified or reduced scale, other appropriate units can also be used. In addition, in each table shown below, the values ​​rounded to a predetermined number of digits are recorded.

[0241] [Table 1] Example 1

[0242] Sn R D Nd νd 1 147.6534 16.6706 1.49700 81.54 2 -414.4192 0.0594 3 113.2390 19.5723 1.43875 94.66 4 -251.8451 0.3546 5 -244.8250 3.0555 1.81600 46.62 6 122.1038 0.3566 7 87.5317 14.9714 1.49700 81.54 8 2484.7195 0.0776 9 71.9900 11.3958 1.49700 81.54 10 162.7856 DD

[10] *11 206.5353 1.8627 1.96300 24.11 *12 31.6144 6.7039 13 -154.7149 7.0548 1.95906 17.47 14 -29.9827 1.6437 1.72916 54.09 15 40.4244 DD

[15] 16 41.1516 10.6812 1.80100 34.97 17 -30.3155 1.7687 2.00100 29.14 18 342.1222 DD

[18] 19 -223.0172 1.4848 1.60300 65.44 20 16.2896 3.0929 1.68893 31.07 21 41.2505 2.3813 22 -30.5188 1.3615 1.55200 70.70 23 263.5177 DD

[23] 24(St) ∞ 0.2500 25 47.4779 4.0926 1.49700 81.54 26 -84.5197 2.0115 27 455.1103 2.1943 1.49700 81.54 28 -95.0230 0.0318 29 112.8905 1.8035 1.65160 58.54 30 2456.8899 0.0345 31 47.6626 5.2336 1.49700 81.54 32 -43.3266 0.9999 1.95375 32.32 33 1442.5172 3.8123 34 -33.5272 4.9914 1.92286 18.90 35 -34.4209 34.2500 *36 31.4149 3.0041 1.55332 71.68 *37 -125.8833 1.1246 38 -28.3923 1.0000 1.64850 53.02 39 16.2384 8.5114 1.51633 64.14 40 -21.7659 1.0000 41 -23.5453 2.1302 1.43875 94.66 42 -11.3338 1.0449 1.95375 32.32 43 -59.3529 0.4118 44 -38.7859 3.4795 1.84666 23.78 45 -15.0799 7.0000 46 ∞ 1.0000 1.51680 64.20 47 ∞ 0.4400

[0243] [Table 2]

[0244] Example 1

[0245]

[0246] [Table 3]

[0247] Example 1

[0248] Wide Tele DD

[10] 1.83 47.53 DD

[15] 15.91 0.52 DD

[18] 45.42 62.54 DD

[23] 48.10 0.68

[0249] [Table 4]

[0250] Example 1

[0251] Sn 11 12 36 37 KA -3.1881964E+00 9.5945908E-01 6.8174766E-01 -5.7736037E-01 A3 2.9914579E-05 2.9755000E-05 -3.9293723E-05 -2.8048129E-05 A4 1.5636982E-06 2.8380368E-06 4.3720309E-06 5.4529912E-06 A5 7.9794438E-08 5.3460576E-08 -3.6352797E-08 2.6248745E-07 A6 -3.4127702E-09 3.8093423E-09 2.2565203E-08 -7.8553248E-09 A7 -1.1601342E-10 -9.9726877E-11 3.1856377E-09 4.6372196E-10 A8 1.5135284E-12 1.1801621E-12 -6.3482730E-11 -1.4698462E-10 A9 -1.1130423E-13 -3.2398722E-13 -6.5412637E-12 -1.2967333E-11 A10 4.5339654E-15 4.5700449E-15 -1.8528531E-12 7.1319926E-13 A11 4.3391680E-17 -1.2367743E-16 -2.1066161E-13 1.0126831E-13 A12 2.5225840E-17 6.5069356E-17 -2.7634124E-16 -1.1632251E-14 A13 2.0588366E-18 -2.8189867E-18 6.1575112E-16 -4.3208640E-16 A14 -1.4169173E-19 5.5250116E-19 -4.3523865E-18 -2.9328814E-16 A15 1.7302364E-21 1.3929424E-20 2.1671742E-17 -2.6035164E-17 A16 -3.5984515E-23 -5.4989548E-22 -3.3421575E-18 -5.9228571E-19 A17 -1.1992709E-23 -1.5336957E-22 -3.0183171E-19 -3.7843290E-20 A18 4.7525995E-25 7.2259726E-26 -1.1840670E-20 -3.3198439E-20 A19 -8.5662921E-27 -1.1054246E-25 1.4265769E-21 -2.5504526E-21 A20 2.6258322E-28 1.4778264E-26 7.3011972E-23 7.1928279E-22

[0252] exist Figure 3 , various aberration diagrams are shown when the zoom lens of Example 1 is in focus on an object at infinity. Figure 3 In the figure, spherical aberration, astigmatism, distortion and chromatic aberration of magnification are shown from left to right. Figure 3In the figure, the aberrations in the wide-angle end state are shown in the upper section marked as "Wide", and the aberrations in the telephoto end state are shown in the lower section marked as "Tele". In the spherical aberration diagram, the aberrations of the d-line, C-line and F-line are shown with solid lines, long dashed lines and short dashed lines, respectively. In the astigmatism diagram, the aberrations under the d-line in the sagittal direction are shown with solid lines, and the aberrations under the d-line in the meridional direction are shown with short dashed lines. In the distortion diagram, the aberrations under the d-line are shown with solid lines. In the lateral chromatic aberration diagram, the aberrations of the C-line and F-line are shown with long dashed lines and short dashed lines, respectively. In the spherical aberration diagram, the value of the open F value is shown after FNo.=. In the other aberration diagrams, the value of the maximum half viewing angle is shown after ω=.

[0253] Unless otherwise specified, the symbols, meanings, recording methods and graphical representation methods of various data related to the above-mentioned embodiment 1 are basically the same in the following embodiments, and therefore repeated descriptions are omitted below.

[0254] [Example 2]

[0255] The structure and movement trajectory of the zoom lens of Example 2 are shown in FIG. Figure 4 . The zoom lens of Example 2 includes, from the object side to the image side, a front group GF, a middle group GM, and a rear group GR. The front group GF includes one lens group having positive focal power. The middle group GM includes one lens group having negative focal power. The rear group GR includes, from the object side to the image side, three lens groups, namely, a first subsequent lens group GR1 having positive focal power, a second subsequent lens group GR2 having negative focal power, and a third subsequent lens group GR3 having positive focal power. When zooming from the wide-angle end to the telephoto end, the front group GF and the third subsequent lens group GR3 are fixed relative to the image plane Sim, and the middle group GM, the first subsequent lens group GR1, and the second subsequent lens group GR2 change the intervals between adjacent lens groups and move along the optical axis Z.

[0256] The front group GF includes five lenses, namely, lenses L11 to L15, from the object side to the image side. The middle group GM includes three lenses, namely, lenses L21 to L23, from the object side to the image side. The first subsequent lens group GR1 includes two lenses, namely, lenses L31 to L32, from the object side to the image side. The second subsequent lens group GR2 includes three lenses, namely, lenses L41 to L43, from the object side to the image side. The third subsequent lens group GR3 includes 11 lenses, namely, aperture stop St and lenses L51 to L61, from the object side to the image side. The focus group includes three lenses, namely, lenses L56 to L58. The anti-vibration group includes four lenses, namely, lenses L51 to L54.

[0257] Regarding the zoom lens of Example 2, basic lens data is shown in Table 5, specifications are shown in Table 6, variable surface spacing is shown in Table 7, aspheric coefficients are shown in Table 8, and various aberration diagrams are shown in Table 9. Figure 5 middle.

[0258] [Table 5]

[0259] Example 2

[0260] Sn R D Nd νd 1 151.5768 18.4588 1.49700 81.54 2 -387.8515 1.4209 3 165.6241 19.8244 1.43875 94.66 4 -216.0083 6.1019 1.83481 42.74 5 211.0380 1.1655 *6 98.6566 12.8704 1.49700 81.54 *7 1171.4109 0.0250 8 76.2442 11.4272 1.49700 81.54 9 129.4214 DD[9] *10 101.0475 1.8543 1.95150 29.83 *11 29.1368 7.4203 12 -209.8949 10.0320 1.95906 17.47 13 -32.7224 6.8605 1.78800 47.37 14 44.6063 DD

[14] 15 46.6766 6.6531 1.76200 40.10 16 -38.8252 1.5045 2.00100 29.14 17 1527.4475 DD

[17] 18 -280.1552 1.0020 1.62041 60.29 19 16.7919 2.9119 1.69895 30.13 20 45.2184 2.1711 21 -28.6486 1.0002 1.55200 70.70 22 377.0683 DD

[22] 23(St) ∞ 0.2500 *24 43.8709 4.6716 1.49700 81.54 *25 -91.8232 0.0250 26 60.4512 3.4245 1.49700 81.54 27 -171.9570 0.0756 28 47.8309 6.5758 1.49700 81.54 29 -30.6829 1.3351 1.95375 32.32 30 -1043.1686 4.8025 31 -32.3850 2.5432 1.95906 17.47 32 -28.5503 29.1000 *33 23.5386 3.1879 1.49710 81.56 *34 -46.2792 0.7806 35 -25.5458 1.0002 1.80400 46.53 36 23.0522 6.0219 1.51742 52.43 37 -18.6678 1.0000 38 -13.4415 1.6124 1.43875 94.66 39 -9.7175 1.0000 2.00100 29.14 40 41.2790 1.7398 41 109.7541 3.3729 1.85478 24.80 42 -12.4236 8.0000 43 ∞ 1.0000 1.51680 64.20 44 ∞ 0.4500

[0261] [Table 6]

[0262] Example 2

[0263]

[0264] [Table 7]

[0265] Example 2

[0266] Wide Tele DD[9] 0.50 53.03 DD

[14] 16.55 0.51 DD

[17] 47.87 62.12 DD

[22] 51.67 0.92

[0267] [Table 8]

[0268] Example 2

[0269]

[0270] [Example 3]

[0271] The structure and movement trajectory of the zoom lens of Example 3 are shown in FIG. Figure 6 . The zoom lens of Example 3 includes, from the object side to the image side, a front group GF, a middle group GM, and a rear group GR. The front group GF includes one lens group having positive focal power. The middle group GM includes one lens group having negative focal power. The rear group GR includes, from the object side to the image side, three lens groups, namely, a first subsequent lens group GR1 having positive focal power, a second subsequent lens group GR2 having negative focal power, and a third subsequent lens group GR3 having positive focal power. When zooming from the wide-angle end to the telephoto end, the front group GF, the first subsequent lens group GR1, and the third subsequent lens group GR3 are fixed relative to the image plane Sim, and the middle group GM and the second subsequent lens group GR2 change the intervals between the adjacent lens groups and move along the optical axis Z.

[0272] The front group GF includes four lenses, namely, lenses L11 to L14, in order from the object side to the image side. The middle group GM includes five lenses, namely, lenses L21 to L25, in order from the object side to the image side. The first subsequent lens group GR1 includes four lenses, namely, lenses L31 to L34, in order from the object side to the image side, and an aperture stop St. The second subsequent lens group GR2 includes four lenses, namely, lenses L41 to L44, in order from the object side to the image side. The third subsequent lens group GR3 includes 15 lenses, namely, lenses L51 to L65, in order from the object side to the image side. The focusing group includes the second subsequent lens group GR2.

[0273] Regarding the zoom lens of Example 3, basic lens data are shown in Tables 9A and 9B, specifications are shown in Table 10, variable surface intervals are shown in Table 11, aspheric coefficients are shown in Table 12, and various aberration diagrams are shown in Table 13. Figure 7 In Examples 3, 4, 7, and 8, the basic lens data is divided into two tables to show the data in order to avoid lengthening one table.

[0274] [Table 9A]

[0275] Example 3

[0276] Sn R D Nd νd 1 247.0132 4.0000 1.64769 33.84 2 135.9541 19.2417 1.49700 81.61 3 -254.8294 0.1000 4 101.9135 20.5187 1.49700 81.61 5 -325.1368 3.0000 1.66672 48.32 6 246.3851 DD[6] 7 465.2322 8.0000 1.84666 23.78 8 -44.6990 1.0100 1.67790 55.34 9 48.2074 4.2724 10 -84.6935 1.0102 1.80420 46.50 11 59.3825 3.3477 1.85451 25.15 12 -1628.2054 2.9568 13 -43.9693 1.0002 1.80420 46.50 14 172.6194 DD

[14] *15 50.5583 5.0000 1.51633 64.06 *16 -125.3084 1.3411 17 61.1190 8.0872 1.49700 81.61 18 -59.0873 1.6933 19 83.7151 1.2610 1.85451 25.15 20 31.6889 8.8762 1.49700 81.61 21 -57.0227 1.1106 22(St) ∞ DD

[22] 23 285.1349 1.6494 1.74950 35.33 24 17.8611 1.5696 25 -62.3904 1.0100 1.72916 54.68 26 10.5309 1.8878 1.80518 25.42 27 149.3643 1.1735 28 -23.5963 0.9999 1.71700 47.93 29 90.8642 DD

[29]

[0277] [Table 9B]

[0278] Example 3

[0279] Sn R D Nd νd *30 48.7805 2.2673 1.51633 64.06 *31 -270.3360 0.1000 32 21.4268 6.3809 1.49700 81.61 33 589.0228 0.5318 34 22.6441 7.0428 1.49700 81.61 35 -45.1099 1.2873 1.77250 49.60 36 -133.3459 0.1001 37 43.6056 1.1647 1.85026 32.27 38 13.5562 5.0108 1.49700 81.61 39 54.9688 0.1937 40 99.2214 3.1141 1.49700 81.61 41 -14.7705 1.7783 1.80400 46.58 42 28.6695 7.1137 43 64.4441 2.4069 1.89286 20.36 44 -8.8639 0.8000 1.90043 37.37 45 10.2165 0.1001 46 10.7107 3.0377 1.62004 36.26 47 -8.9759 1.0001 1.90043 37.37 48 67.6153 0.1073 49 17.5822 3.2369 1.58144 40.89 50 -8.0039 1.0000 1.88300 40.80 51 -115.1517 0.1002 52 17.8446 1.1272 1.51823 58.90 53 -56.4855 7.7002 54 ∞ 0.6000 1.51680 64.20 55 ∞ 0.8000 56 ∞ 1.5500 1.51680 64.20 57 ∞ 0.8500 58 ∞ 0.7000 1.51680 64.20 59 ∞ 0.7000

[0280] [Table 10]

[0281] Example 3

[0282]

[0283] [Table 11]

[0284] Example 3

[0285] Wide Tele DD[6] 3.12 97.94 DD

[14] 95.49 0.67 DD

[22] 3.07 30.67 DD

[29] 33.01 5.42

[0286] [Table 12]

[0287] Example 3

[0288] Sn 15 16 30 31 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 0.0000000E+00 8.4326836E-21 1.4705433E-20 -8.6271874E-21 A4 -6.4069336E-06 3.4695349E-06 -7.7733878E-07 9.3143684E-06 A5 3.8909772E-07 4.1919621E-07 -2.6094269E-06 -2.3203159E-06 A6 1.5979068E-08 2.2919374E-09 3.8048437E-08 7.1964048E-08 A7 -2.8798503E-09 -1.5591686E-09 4.8779352E-08 3.9960023E-08 A8 -7.2369391E-11 -5.6640693E-11 4.7627062E-10 -2.9993011E-10 A9 1.1713556E-11 5.1359614E-12 -1.0867135E-09 -7.5583929E-10 A10 3.6244534E-13 4.3331373E-13 1.6126726E-11 -1.0167132E-11 A11 -3.0354570E-14 -1.2095044E-14 1.5504112E-11 1.3984530E-11 A12 -1.3047757E-15 -1.6318478E-15 -7.6843099E-13 -1.2630224E-13 A13 4.9385469E-17 1.8948601E-17 -1.3682998E-13 -1.8582519E-13 A14 2.7643229E-18 3.3254297E-18 1.1093197E-14 6.5572289E-15 A15 -4.8752595E-20 -1.8518121E-20 7.3483378E-16 1.4744748E-15 A16 -3.3050141E-21 -3.7717600E-21 -7.9745187E-17 -7.7071970E-17 A17 2.6667536E-23 1.0166081E-23 -2.1906053E-18 -6.1640990E-18 A18 2.0752763E-24 2.2514236E-24 2.8893006E-19 3.8348590E-19 A19 -6.1975853E-27 -2.3874545E-27 2.7824994E-21 1.0419283E-20 A20 -5.3352706E-28 -5.5304790E-28 -4.1695435E-22 -7.0494583E-22

[0289] [Example 4]

[0290] The structure and movement trajectory of the zoom lens of Example 4 are shown in FIG. Figure 8 . The zoom lens of Example 4 includes, from the object side to the image side, a front group GF, a middle group GM, and a rear group GR. The front group GF includes one lens group having positive focal power. The middle group GM includes one lens group having negative focal power. The rear group GR includes, from the object side to the image side, three lens groups, namely, a first subsequent lens group GR1 having positive focal power, a second subsequent lens group GR2 having negative focal power, and a third subsequent lens group GR3 having positive focal power. When zooming from the wide-angle end to the telephoto end, the front group GF, the first subsequent lens group GR1, and the third subsequent lens group GR3 are fixed relative to the image plane Sim, and the middle group GM and the second subsequent lens group GR2 change the intervals between the adjacent lens groups and move along the optical axis Z.

[0291] The front group GF includes four lenses, namely, lenses L11 to L14, in order from the object side to the image side. The middle group GM includes five lenses, namely, lenses L21 to L25, in order from the object side to the image side. The first subsequent lens group GR1 includes five lenses, namely, lenses L31 to L35, and an aperture stop St, in order from the object side to the image side. The second subsequent lens group GR2 includes four lenses, namely, lenses L41 to L44, in order from the object side to the image side. The third subsequent lens group GR3 includes 15 lenses, namely, lenses L51 to L65, in order from the object side to the image side. The focusing group includes the second subsequent lens group GR2.

[0292] Regarding the zoom lens of Example 4, basic lens data are shown in Tables 13A and 13B, specifications are shown in Table 14, variable surface intervals are shown in Table 15, aspheric coefficients are shown in Table 16, and various aberration diagrams are shown in Table 17. Fig. 9 .

[0293] [Table 13A]

[0294] Example 4

[0295] Sn R D Nd νd 1 190.1440 6.6675 1.80518 25.46 2 143.8589 20.8760 1.49700 81.61 3 -453.0417 10.4135 4 138.5199 16.2831 1.49700 81.61 5 -552.7561 8.2227 1.77250 49.62 6 383.0685 DD[6] 7 299.8818 15.0000 1.89286 20.36 8 -50.7023 2.0738 1.65160 58.54 9 49.3895 2.8035 10 -171.2639 1.0100 1.80400 46.58 11 63.0976 1.9810 1.90043 37.37 12 123.3247 3.3346 13 -34.9445 1.0002 1.71299 53.87 14 149.7756 DD

[14] 15 59.4532 4.7854 1.49700 81.61 16 -136.5582 1.2650 *17 -244.0193 2.1880 1.51633 64.06 *18 -294.5579 1.4081 19 53.6618 9.0765 1.49700 81.61 20 -57.0724 1.9187 21 72.2479 1.0449 1.80000 29.84 22 26.8727 9.9873 1.49700 81.61 23 67.0371 1.9839 24(St) ∞ DD

[24] 25 100.2859 1.0221 2.00100 29.13 26 18.4256 1.2409 27 -89.4469 2.2562 1.75500 52.32 28 13.2979 2.9564 1.92286 20.88 29 465.6185 1.0524 30 -25.1182 1.2956 1.90043 37.37 31 115.5237 DD

[31]

[0296] [Table 13B]

[0297] Example 4

[0298] Sn R D Nd νd *32 52.2537 3.6617 1.51633 64.06 *33 -288.2367 0.0999 34 26.5634 5.7836 1.49700 81.61 35 -228.2036 0.1429 36 22.6322 7.3560 1.49700 81.61 37 -36.6601 1.1282 1.85883 30.00 38 -59.9409 0.1053 39 92.3102 1.0050 1.90366 31.31 40 23.1162 3.7980 1.51823 58.90 41 -62.1920 2.1047 42 -28.5150 1.2141 1.85150 40.78 43 20.0540 4.4540 1.51742 52.43 44 -28.5152 1.7441 45 75.3030 2.8426 1.89286 20.36 46 -16.4475 1.1323 1.90043 37.37 47 11.9658 0.4111 48 9.9696 4.1342 1.57501 41.50 49 -18.0007 1.7294 1.90043 37.37 50 13.3346 0.3680 51 16.5772 6.0346 1.68893 31.07 52 -7.2680 1.0000 1.90043 37.37 53 -40.9374 1.6147 54 30.0976 3.2323 1.51823 58.90 55 -116.4360 8.2821 56 ∞ 0.6000 1.51680 64.20 57 ∞ 0.8000 58 ∞ 1.5500 1.51680 64.20 59 ∞ 0.8500 60 ∞ 0.7000 1.51680 64.20 61 ∞ 0.7100

[0299] [Table 14]

[0300] Example 4

[0301]

[0302] [Table 15]

[0303] Example 4

[0304] Wide Tele DD[6] 6.52 124.46 DD

[14] 121.66 3.71 DD

[24] 3.07 30.63 DD

[31] 35.88 8.32

[0305] [Table 16]

[0306] Example 4

[0307] Sn 17 18 32 33 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 1.2143064E-21 -1.1275703E-21 -1.8822954E-20 -1.4117216E-20 A4 -1.4433774E-05 -5.9726797E-06 -1.4620962E-05 -3.1932829E-06 A5 1.9089245E-07 1.3285024E-07 1.4842904E-06 5.2268705E-08 A6 -3.2319483E-08 -2.4036628E-08 -2.3449996E-07 2.2446983E-07 A7 -1.7409936E-09 -1.1188317E-09 -4.3422881E-08 -6.4961359E-08 A8 5.6784563E-10 4.6483252E-10 3.3707102E-08 1.2639022E-08 A9 9.4062010E-12 5.3382827E-12 -5.9555689E-10 2.2797526E-09 A10 -3.5598661E-12 -2.7423838E-12 -9.2072583E-10 -5.5772049E-10 A11 -3.0005189E-14 -1.4746207E-14 3.1876261E-11 -3.9912698E-11 A12 1.3949088E-14 1.0201734E-14 1.2944334E-11 1.0106115E-11 A13 5.9007756E-17 2.4564018E-17 -4.9294700E-13 3.8999251E-13 A14 -3.4280427E-17 -2.4055281E-17 -1.0581234E-13 -1.0120094E-13 A15 -7.0792263E-20 -2.4287062E-20 3.8460518E-15 -2.1323019E-15 A16 5.0553670E-20 3.4295294E-20 5.0034578E-16 5.8015269E-16 A17 4.7766635E-23 1.3035969E-23 -1.5352170E-17 6.0147257E-18 A18 -4.0808387E-23 -2.6924479E-23 -1.2501065E-18 -1.7832238E-18 A19 -1.3951826E-26 -2.8880116E-27 2.4946728E-20 -6.6779000E-21 A20 1.3846880E-26 8.9276669E-27 1.2392024E-21 2.2789463E-21

[0308] [Example 5]

[0309] The structure and movement trajectory of the zoom lens of Example 5 are shown in FIG. Fig.10. The zoom lens of Example 5 includes, from the object side to the image side, a front group GF, a middle group GM, and a rear group GR. The front group GF includes one lens group having positive focal power. The middle group GM includes one lens group having negative focal power. The rear group GR includes, from the object side to the image side, two lens groups, a first subsequent lens group GR1 having positive focal power and a second subsequent lens group GR2 having negative focal power. When changing magnification from the wide-angle end to the telephoto end, the front group GF and the second subsequent lens group GR2 are fixed relative to the image plane Sim, and the middle group GM and the first subsequent lens group GR1 change the intervals between the adjacent lens groups and move along the optical axis Z.

[0310] The front group GF includes four lenses, L11 to L14, in order from the object side to the image side. The middle group GM includes three lenses, L21 to L23, in order from the object side to the image side. The first subsequent lens group GR1 includes four lenses, L31 to L34, in order from the object side to the image side. The second subsequent lens group GR2 includes an aperture stop St, lenses L41 to L47, a filter P1, and lenses L48 to L49 in order from the object side to the image side. The focus group includes three lenses, L45 to L47.

[0311] Regarding the zoom lens of Example 5, basic lens data is shown in Table 17, specifications are shown in Table 18, variable surface intervals are shown in Table 19, aspheric coefficients are shown in Table 20, and various aberration diagrams are shown in Table 21. Fig.11 middle.

[0312] [Table 17] Example 5

[0313] Sn R D Nd νd 1 215.2881 1.0200 1.51680 64.20 2 112.4813 20.0583 1.49700 81.61 3 -354.1377 0.2000 4 117.5491 15.4841 1.49700 81.61 5 -697.9575 1.0000 1.84999 31.50 6 365.6764 DD[6] 7 89.2890 8.4696 1.84999 22.50 8 -44.1422 10.0156 1.84999 41.06 9 27.6238 7.4951 *10 -26.6925 1.0000 1.58313 59.46 *11 68.0245 DD

[11] 12 28.8407 6.8007 1.59684 65.10 13 300.0107 0.2791 *14 47.7932 3.7403 1.49710 81.56 *15 -211.5914 0.3283 16 76.7956 1.0000 1.86980 38.49 17 20.4012 9.6839 1.49700 81.61 18 -42.0728 DD

[18] 19(St) ∞ 1.8000 20 81.3782 2.5399 1.73974 28.01 21 -244.3696 0.9653 22 -67.3532 3.6636 1.52001 52.82 23 -18.1297 1.0000 1.84999 41.05 24 24.5174 0.2000 25 23.6119 4.7814 1.55795 44.13 26 -20.8789 0.4000 27 -117.6425 0.9700 1.84999 43.00 28 15.0691 5.2475 1.65575 33.16 29 -26.1803 0.4987 30 -52.0553 1.0000 1.78466 49.53 31 15.0022 15.6532 32 ∞ 1.0000 1.51680 64.20 33 ∞ 1.4697 34 -32.6903 1.2639 1.84999 22.50 35 -48.1152 1.1923 36 21.8784 3.8948 1.66450 34.14 37 -233.2844 7.3300 38 ∞ 0.6000 1.51680 64.20 39 ∞ 0.8000 40 ∞ 1.5500 1.51680 64.20 41 ∞ 0.8500 42 ∞ 0.7000 1.51680 64.20 43 ∞ 1.2100

[0314] [Table 18]

[0315] Example 5

[0316]

[0317] [Table 19]

[0318] Example 5

[0319] Wide Tele DD[6] 1.41 118.38 DD

[11] 151.30 0.97 DD

[18] 0.98 34.34

[0320] [Table 20]

[0321] Example 5

[0322] Sn 10 11 14 15 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 1.3908133E-20 -1.5172509E-20 2.1625515E-19 -7.7233981E-20 A4 -1.2549382E-04 -1.2574593E-04 -1.9601635E-05 -5.4550320E-06 A5 1.6102357E-05 1.4250672E-05 1.0445875E-06 1.3564136E-06 A6 -9.7992847E-07 -4.2990876E-07 -2.4002717E-07 -2.9784489E-07 A7 -5.8648688E-08 -1.0433727E-07 3.0657685E-08 4.0273203E-08 A8 2.2601423E-08 1.6188300E-08 -1.6322094E-10 -1.9862934E-10 A9 2.5651675E-10 1.3380679E-09 -3.3850308E-10 -5.1883653E-10 A10 -3.1889039E-10 -2.6166819E-10 3.2797586E-12 1.1446302E-11 A11 -4.2454035E-12 -2.3535801E-11 2.9827746E-12 4.8324502E-12 A12 3.0386569E-12 3.3159114E-12 -3.4931718E-14 -1.5093750E-13 A13 4.6025421E-14 2.3728858E-13 -1.6360368E-14 -2.7294286E-14 A14 -1.8483399E-14 -2.7904493E-14 1.3474417E-16 9.2625521E-16 A15 -3.0067359E-16 -1.3501598E-15 5.4304645E-17 9.1981557E-17 A16 7.2290272E-17 1.4587948E-16 -1.1600946E-19 -3.0504064E-18 A17 1.0244835E-18 4.0574105E-18 -9.9747522E-20 -1.7024726E-19 A18 -1.7031602E-19 -4.2567271E-19 -5.5053869E-22 5.1340682E-21 A19 -1.4035076E-21 -5.0065393E-21 7.7778213E-23 1.3325485E-22 A20 1.8669798E-22 5.2708089E-22 1.1202109E-24 -3.3863481E-24

[0323] [Example 6]

[0324] The structure and movement trajectory of the zoom lens of Example 6 are shown in FIG. Fig.12. The zoom lens of Example 6 includes, from the object side to the image side, a front group GF, a middle group GM, and a rear group GR. The front group GF includes one lens group having positive focal power. The middle group GM includes one lens group having negative focal power. The rear group GR includes, from the object side to the image side, two lens groups, a first subsequent lens group GR1 having positive focal power and a second subsequent lens group GR2 having negative focal power. When changing magnification from the wide-angle end to the telephoto end, the front group GF and the second subsequent lens group GR2 are fixed relative to the image plane Sim, and the middle group GM and the first subsequent lens group GR1 change the interval between the adjacent lens groups and move along the optical axis Z.

[0325] The front group GF includes four lenses, L11 to L14, in order from the object side to the image side. The middle group GM includes three lenses, L21 to L23, in order from the object side to the image side. The first subsequent lens group GR1 includes four lenses, L31 to L34, in order from the object side to the image side. The second subsequent lens group GR2 includes an aperture stop St, lenses L41 to L47, a filter P1, and lenses L48 to L49 in order from the object side to the image side. The focus group includes three lenses, L45 to L47.

[0326] Regarding the zoom lens of Example 6, basic lens data is shown in Table 21, specifications are shown in Table 22, variable surface intervals are shown in Table 23, aspheric coefficients are shown in Table 24, and various aberration diagrams are shown in Table 25. Fig.13 middle.

[0327] [Table 21]

[0328] Example 6

[0329] Sn R D Nd νd 1 167.3167 2.7210 1.51680 64.20 2 116.0664 20.0120 1.43700 95.10 3 -320.2512 0.2001 4 116.7744 16.8094 1.49700 81.61 5 -430.1466 1.0001 1.84990 33.36 6 463.2843 DD[6] 7 82.7717 10.4228 1.84990 22.51 8 -36.0013 3.7154 1.79560 47.64 9 28.9449 6.7088 *10 -47.0446 1.0001 1.80610 40.73 *11 40.7756 DD

[11] 12 32.2731 7.0285 1.73325 54.67 13 -484.2106 0.6914 *14 42.2630 3.5403 1.58313 59.46 *15 175.2210 0.1868 16 98.9740 1.0007 1.91090 36.17 17 20.8165 9.7305 1.43700 95.10 18 -44.6903 DD

[18] 19(St) ∞ 1.8001 20 43.5559 2.8574 1.82376 23.93 21 415.9484 0.5440 22 -133.2437 4.1718 1.53021 49.34 23 -18.8928 1.0002 1.90366 31.31 24 80.3875 0.2001 25 132.3844 3.5384 1.59492 38.51 26 -22.9220 0.4002 27 -40.8556 0.9701 1.84990 42.68 28 15.0028 6.1715 1.63090 34.94 29 -16.3554 0.2001 *30 -28.6465 1.2901 1.80610 40.73 *31 19.4835 14.2362 32 ∞ 1.0000 1.51680 64.20 33 ∞ 0.5425 *34 -37.8085 1.0001 1.80610 40.73 *35 41.5025 0.7896 36 15.0237 6.2829 1.67417 33.13 37 -37.5425 7.3300 38 ∞ 0.6000 1.51680 64.20 39 ∞ 0.8000 40 ∞ 1.5500 1.51680 64.20 41 ∞ 0.8500 42 ∞ 0.7000 1.51680 64.20 43 ∞ 1.3800

[0330] [Table 22]

[0331] Example 6

[0332]

[0333] [Table 23]

[0334] Example 6

[0335] Wide Tele DD[6] 0.95 111.30 DD

[11] 153.97 0.96 DD

[18] 0.98 43.64

[0336] [Table 24]

[0337] Example 6

[0338]

[0339] [Example 7]

[0340] The structure and movement trajectory of the zoom lens of Example 7 are shown in FIG. Fig.14 . The zoom lens of Example 7 includes a front group GF, a middle group GM, and a rear group GR in order from the object side to the image side. The front group GF includes two lens groups, a first front lens group GF1 having positive focal power and a second front lens group GF2 having positive focal power, in order from the object side to the image side. The middle group GM includes one lens group having negative focal power. The rear group GR includes two lens groups, a first subsequent lens group GR1 having positive focal power and a second subsequent lens group GR2 having negative focal power, in order from the object side to the image side. When changing the magnification from the wide-angle end to the telephoto end, the first front lens group GF1 and the second subsequent lens group GR2 are fixed relative to the image plane Sim, and the second front lens group GF2, the middle group GM and the first subsequent lens group GR1 change the intervals between the adjacent lens groups and move along the optical axis Z.

[0341] The first front lens group GF1 includes three lenses, L11 to L13, in order from the object side to the image side. The second front lens group GF2 includes one lens, L14. The middle group GM includes four lenses, L21 to L24, in order from the object side to the image side. The first subsequent lens group GR1 includes three lenses, L31 to L33, in order from the object side to the image side. The second subsequent lens group GR2 includes an aperture stop St, lenses L41 to L52, a filter P1, and lenses L53 to L57 in order from the object side to the image side. The focusing group includes four lenses, L47 to L50.

[0342] Regarding the zoom lens of Example 7, basic lens data are shown in Tables 25A and 25B, specifications are shown in Table 26, variable surface spacing is shown in Table 27, aspheric coefficients are shown in Table 28, and various aberration diagrams are shown in Table 29. Fig.15 .

[0343] [Table 25A]

[0344] Example 7

[0345] Sn R D Nd νd 1 270.9874 14.0514 1.51122 78.27 2 -219.0967 0.1256 3 128.3875 19.8509 1.48856 81.48 4 -175.3735 2.5192 1.80627 47.05 5 161.0078 DD[5] 6 87.1170 13.5146 1.47118 83.06 7 1289.4215 DD[7] *8 647.5762 2.9866 1.69770 56.61 *9 54.5943 2.3711 10 -176.6265 1.2159 1.74939 53.06 11 96.3605 3.0218 12 v36.5399 3.3604 1.90956 19.52 13 -18.8811 1.2102 1.78876 49.12 14 99.1313 DD

[14] *15 58.4686 5.6183 1.49710 81.56 *16 -65.3425 0.1217 17 40.6268 1.3591 1.87440 29.76 18 25.2752 7.4361 1.48317 82.59 19 -204.4595 DD

[19] 20(St) ∞ 0.7122 21 61.0593 1.2001 1.43001 68.12 22 27.5250 2.9300 1.50407 75.42 23 81.7295 1.7438 24 -120.2220 1.2067 1.81482 46.05 25 64.6387 0.1202 26 29.6286 2.1449 1.90618 19.80 27 64.4798 0.1201 28 19.0111 2.3466 1.49142 72.15 29 31.9871 1.0730 30 56.4259 1.2002 1.90999 30.35 31 19.1363 14.6000 32 166.1915 1.2002 1.55659 44.39 33 -369.7628 0.8159 34 33.4343 1.5831 1.43001 68.12 35 3422.6674 0.1201

[0346] [Table 25B]

[0347] Example 7

[0348] Sn R D Nd νd 36 20.1558 0.8001 1.90651 19.67 37 14.2548 1.8526 1.68082 41.39 38 58.9909 0.9300 39 43.0755 1.3335 1.78426 26.77 40 -222.5791 0.2288 41 26.9791 0.7003 1.82460 42.97 42 8.3645 1.6885 43 ∞ 1.0000 1.51680 64.20 44 ∞ 0.6666 45 30.2506 2.5494 1.43000 68.12 46 -9.9396 0.8002 1.85003 42.33 47 13.0820 0.3858 48 16.9176 3.0653 1.57316 41.28 49 -10.9665 0.1271 50 -16.4199 1.2002 1.86578 40.34 51 124.0175 0.1621 52 16.3464 2.3299 1.69200 30.57 53 -45.2801 5.0000 54 ∞ 1.0000 1.51633 64.05 55 ∞ 6.9546

[0349] [Table 26]

[0350] Example 7

[0351]

[0352] [Table 27]

[0353] Example 7

[0354] Wide Tele DD[5] 0.97 8.89 DD[7] 8.89 92.94 DD

[14] 145.00 0.93 DD

[19] 0.83 52.93

[0355] [Table 28]

[0356] Example 7

[0357] Sn 8 9 15 16 KA 1.0000000E+00 1.0000000E+00 1.0000000E+00 1.0000000E+00 A3 1.5830279E-05 1.7800161E-05 1.5287583E-05 1.7151489E-05 A4 9.5030393E-07 6.8721054E-07 7.1179650E-08 9.3853640E-07 A5 9.6420217E-08 8.5864173E-08 -3.2679307E-08 2.9046684E-08 A6 1.3527176E-09 3.4143803E-10 2.7373704E-10 2.9104740E-10 A7 2.6550743E-11 5.2570916E-10 1.3216346E-10 -3.8976669E-11 A8 7.7064854E-12 1.0668034E-11 4.6146211E-12 2.7070293E-12 A9 3.6025658E-13 3.0635527E-12 -1.9794321E-13 4.8934621E-13 A10 3.9347141E-14 -3.3703439E-13 5.6056036E-15 -9.5874213E-15 A11 3.7699520E-15 -6.9643483E-15 5.5804118E-16 -5.1598395E-16 A12 -2.7297027E-16 7.4353186E-16 -7.6435714E-18 3.2268775E-17 A13 -1.3585792E-17 7.2951158E-17 -2.7699780E-18 4.9074764E-19 A14 -3.4645082E-18 1.4643621E-17 2.2760523E-20 -1.9327224E-19 A15 -2.4341682E-19 1.0044652E-18 -1.9753562E-20 -1.0341968E-20 A16 2.8185198E-20 -3.2619340E-19 4.5463912E-22 1.8966525E-22 A17 -5.1987712E-21 -1.3649245E-21 4.9352306E-23 1.3255614E-23 A18 8.5129634E-23 -8.6170587E-22 3.6754963E-25 -1.4242248E-24 A19 1.6793188E-23 -6.8683642E-25 1.4685284E-25 -3.7756960E-26 A20 -7.4002946E-27 9.1729947E-24 -2.2297325E-27 1.1014891E-26

[0358] [Example 8]

[0359] The structure and movement trajectory of the zoom lens of Example 8 are shown in FIG. Fig.16 . The zoom lens of Example 8 includes, from the object side to the image side, a front group GF, a middle group GM, and a rear group GR. The front group GF includes one lens group having positive focal power. The middle group GM includes, from the object side to the image side, two lens groups, namely, a first middle lens group GM1 having negative focal power and a second middle lens group GM2 having negative focal power. The rear group GR includes, from the object side to the image side, two lens groups, namely, a first subsequent lens group GR1 having positive focal power and a second subsequent lens group GR2 having negative focal power. When changing magnification from the wide-angle end to the telephoto end, the front group GF and the second subsequent lens group GR2 are fixed relative to the image plane Sim, and the first intermediate lens group GM1, the second intermediate lens group GM2 and the first subsequent lens group GR1 change the intervals between adjacent lens groups and move along the optical axis Z.

[0360] The front group GF includes five lenses, namely, lenses L11 to L15, in order from the object side to the image side. The first intermediate lens group GM1 includes one lens, namely, lens L21. The second intermediate lens group GM2 includes four lenses, namely, lenses L31 to L34, in order from the object side to the image side. The first subsequent lens group GR1 includes four lenses, namely, lenses L41 to L44, in order from the object side to the image side. The second subsequent lens group GR2 includes an aperture stop St, lenses L51 to L61, a filter P1, and lenses L62 to L63, in order from the object side to the image side. The focusing group includes three lenses, namely, lenses L55 to L57.

[0361] Regarding the zoom lens of Example 8, basic lens data are shown in Tables 29A and 29B, specifications are shown in Table 30, variable surface spacing is shown in Table 31, aspheric coefficients are shown in Table 32, and various aberration diagrams are shown in Table 33. Fig.17 .

[0362] [Table 29A]

[0363] Example 8

[0364] Sn R D Nd νd 1 242.0119 3.0014 1.51727 59.71 2 96.5960 17.8922 1.61612 61.93 3 -2770.8574 0.6388 4 198.6458 3.0183 1.83481 42.73 5 79.8489 16.5614 1.43700 95.10 6 789.5321 0.2957 7 84.0040 12.9061 1.43700 95.10 8 358.5406 DD[8] *9 163.2521 1.4833 1.82318 45.28 *10 53.4631 DD

[10] 11 85.2718 1.3103 1.75163 41.22 12 18.4240 3.7246 1.89743 20.11 13 35.4800 3.4429 14 -55.4280 2.5931 1.87310 21.26 15 -27.2379 1.2000 1.90128 37.61 16 95.4592 DD

[16] *17 67.9299 4.3522 1.49710 81.56 *18 -103.0682 1.9773 19 71.1528 2.4107 1.90366 31.31 20 35.2832 5.7849 1.43700 95.10 21 -180.7488 0.1252 22 63.7876 4.7937 1.72236 55.27 23 149.3313 DD

[23] 24(St) ∞ 0.9503 25 37.5810 1.6733 1.81572 39.35 26 15.2710 6.6424 1.57791 45.89 27 -151.3683 0.1255 28 ∞ 1.2008 1.65972 32.84 29 68.2869 0.1202 30 15.6699 1.9110 1.65890 33.15 31 19.7695 3.2400 32 3268.5462 1.0102 1.86670 41.29 33 54.1396 1.6443 1.90999 19.46 34 406.7660 0.1681

[0365] [Table 29B]

[0366] Example 8

[0367] Sn R D Nd νd 35 2739.8343 1.0023 1.85533 42.47 36 21.9834 21.9800 *37 74.2539 2.5367 1.66808 32.38 *38 -21.0962 0.6103 39 50.6304 3.4605 1.49700 81.54 40 -14.3385 1.2003 1.88300 40.76 41 -75.1769 0.3353 42 29.8340 1.2050 1.77126 46.32 43 12.1786 1.6080 44 ∞ 1.0000 1.51680 64.20 45 ∞ 0.1202 46 ∞ 1.2001 1.77361 26.35 47 49.2112 2.0540 1.46106 59.97 48 -29.8442 5.0000 49 ∞ 1.0000 1.51633 64.05 50 ∞ 13.5348

[0368] [Table 30]

[0369] Example 8

[0370]

[0371] [Table 31]

[0372] Example 8

[0373] Wide Tele DD[8] 8.36 104.62 DD

[10] 6.20 7.99 DD

[16] 169.72 1.00 DD

[23] 3.00 73.67

[0374] [Table 32]

[0375] Example 8

[0376]

[0377] Tables 33 and 34 show the corresponding values ​​of conditional expressions (1) to (11) of the zoom lenses of Examples 1 to 8. The corresponding values ​​of the examples shown in Tables 33 and 34 may be used as the upper limit or lower limit of the conditional expression to set the preferred range of the conditional expression.

[0378] [Table 33]

[0379] Type No. Example 1 Example 2 Example 3 Example 4 (1) (ft / fw) / Movmax 1.20 1.27 0.60 0.57 (2) TL / 2Y 65.66 66.87 67.36 82.67 (3) ft / TL 2.71 3.09 2.83 2.70 (4) ft / Bf 102.16 105.52 71.02 79.62 (5) ft / 2Y 88.91 103.33 95.20 111.80 (6) ft / fF1 7.57 8.11 4.60 4.37 (7) |ft / fM1| 38.56 44.16 35.85 41.72 (8) ft / fR1 9.16 9.56 28.33 31.15 (9) ft / fRe -2.90 -6.00 40.10 38.94 (10) <![CDATA[|(1-βfoc 2 )×βfocR 2 |]]> 0.51 0.80 18.55 17.47 (11) <![CDATA[|(1-βM1 2 )×βM1R 2 |]]> 56.94 65.74 0.71 1.70

[0380] [Table 34]

[0381] Type No. Example 5 Example 6 Example 7 Example 8 (1) (ft / fw) / Movmax 0.49 0.61 0.62 0.68 (2) TL / 2Y 64.18 64.18 64.59 75.55 (3) ft / TL 2.77 3.25 2.76 2.77 (4) ft / Bf 68.67 79.66 65.60 50.78 (5) ft / 2Y 88.73 104.32 88.98 104.81 (6) ft / fF1 4.29 5.36 1.64 5.75 (7) |ft / fM1| 41.67 49.83 44.55 10.04 (8) ft / fR1 26.99 28.68 19.93 19.55 (9) ft / fRe -0.01 -0.01 -9.00 -4.57 (10) <![CDATA[|(1-βfoc 2 )×βfocR 2 |]]> 5.64 7.03 3.35 4.41 (11) <![CDATA[|(1-βM1 2 )×βM1R 2 |]]> 0.24 0.24 21.70 21.11

[0382] Although the zoom lenses of Examples 1 to 8 are all compact, they all achieve a zoom ratio of 40 or more and have a high zoom ratio. In addition, the zoom lenses of Examples 1 to 8 all correct various aberrations well and maintain high optical performance. The zoom ratio of the zoom lens of the present invention is preferably 50 or more, more preferably 55 or more, and even more preferably 57 or more.

[0383] Next, an imaging device according to an embodiment of the present invention will be described. Fig.18 2 shows a schematic diagram of an imaging device 100 according to an embodiment of the present invention. The imaging device 100 includes a zoom lens 1 according to an embodiment of the present invention. Examples of the imaging device 100 include surveillance cameras, broadcast cameras, movie cameras, and video cameras.

[0384] The imaging device 100 includes a zoom lens 1, a filter 2 disposed on the image side of the zoom lens 1, and an imaging element 3 disposed on the image side of the filter 2. Fig.18 , a plurality of lenses included in the zoom lens 1 are schematically illustrated.

[0385] The imaging element 3 converts the optical image formed by the zoom lens 1 into an electric signal, and can use, for example, a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). The imaging element 3 is arranged so that its imaging surface is aligned with the image surface of the zoom lens 1 .

[0386] The imaging device 100 further includes a signal processing unit 5, a display unit 6, a magnification control unit 7, and a focus control unit 8. The signal processing unit 5 performs computational processing on the output signal from the imaging element 3. The display unit 6 displays the image formed by the signal processing unit 5. The magnification control unit 7 controls the magnification of the zoom lens 1. The focus control unit 8 controls the focus of the zoom lens 1. Fig.18 Although only one imaging element 3 is shown in the figure, a so-called three-panel imaging device including three imaging elements may be used.

[0387] The above embodiments and examples are used to illustrate the technology of the present invention, 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, Abbe number and aspheric coefficient of each lens are not limited to the values ​​shown in the above embodiments, and other values ​​can be used.

[0388] The following supplementary notes are further disclosed with respect to the above-mentioned embodiments and examples.

[0389] [Note 1]

[0390] A zoom lens comprises a front group, a middle group and a rear group in order from the object side to the image side.

[0391] The front group includes no more than 2 lens groups with positive optical power,

[0392] The lens group closest to the object side of the front group is fixed relative to the image plane when the magnification is changed.

[0393] The intermediate group includes no more than two lens groups with negative optical power,

[0394] The rear group includes a plurality of lens groups,

[0395] The lens group closest to the object in the rear group has positive refractive power.

[0396] The lens group closest to the image side of the rear group is fixed relative to the image plane when changing the magnification.

[0397] When changing magnification, all the intervals between adjacent lens groups change.

[0398] When the focal length of the entire system is set to ft,

[0399] The focal length of the entire system at the wide-angle end with the focus on an object at infinity is fw.

[0400] Among the lens groups that move when zooming, the displacement of the lens group with the largest displacement from the wide angle end to the telephoto end when zooming is defined as Movmax,

[0401] When the unit of Movmax is set to mm,

[0402] The zoom lens satisfies the conditional formula (1) represented by the following formula:

[0403] 0.4<(ft / fw) / Movmax (1).

[0404] [Note 2]

[0405] The zoom lens according to Supplementary Note 1, wherein:

[0406] The sum of the distance on the optical axis from the lens surface of the front group closest to the object side to the lens surface of the rear group closest to the image side in a state of focusing on an infinitely distant object and the back focal length in the air conversion distance of the entire system is set as TL,

[0407] When the maximum image height is set to Y,

[0408] The zoom lens satisfies the conditional formula (2) represented by the following formula:

[0409] TL / 2Y<80 (2).

[0410] [Note 3]

[0411] The zoom lens according to Supplement 1 or 2, wherein:

[0412] When the sum of the distance on the optical axis from the lens surface closest to the object side of the front group to the lens surface closest to the image side of the rear group in a state of focusing on an infinitely distant object and the back focus at the air conversion distance of the entire system is defined as TL,

[0413] The zoom lens satisfies the conditional formula (3) represented by the following formula:

[0414] 2<ft / TL (3).

[0415] [Note 4]

[0416] A zoom lens according to any one of Supplementary Notes 1 to 3, wherein:

[0417] When the back focal length of the entire system at the air conversion distance is set to Bf,

[0418] The zoom lens satisfies the conditional equation (4) represented by the following equation:

[0419] 10<ft / Bf (4).

[0420] [Note 5]

[0421] The zoom lens according to any one of Supplementary Notes 1 to 4, wherein:

[0422] When the maximum image height is set to Y,

[0423] The zoom lens satisfies the conditional equation (5) represented by the following equation:

[0424] 30<ft / 2Y (5).

[0425] [Note 6]

[0426] A zoom lens according to any one of Supplementary Notes 1 to 5, wherein:

[0427] When the focal length of the lens group closest to the object in the front group is set to fF1, the zoom lens satisfies the conditional expression (6) represented by the following expression:

[0428] 0.5<ft / fF1 (6).

[0429] [Note 7]

[0430] A zoom lens according to any one of Supplementary Notes 1 to 6, wherein:

[0431] When the focal length of the lens group closest to the object in the intermediate group is fM1, the zoom lens satisfies the conditional expression (7) represented by the following expression: 5<|ft / fM1| (7).

[0432] [Note 8]

[0433] A zoom lens according to any one of Supplementary Notes 1 to 7, wherein:

[0434] The lens group closest to the object side of the front group includes at least 4 lenses.

[0435] The third lens group from the object side of the rear group includes an aspherical lens.

[0436] [Note 9]

[0437] A zoom lens according to any one of Supplementary Notes 1 to 8, wherein:

[0438] When the focal length of the rear lens group closest to the object is fR1, the zoom lens satisfies the conditional expression (8) represented by the following expression: 0<ft / fR1<100 (8).

[0439] [Note 10]

[0440] A zoom lens according to any one of Supplementary Notes 1 to 9, wherein:

[0441] When the focal length of the lens group closest to the image side of the rear group is set to fRe, the zoom lens satisfies the conditional expression (9) represented by the following expression:

[0442] -100<ft / fRe<200 (9).

[0443] [Note 11]

[0444] The zoom lens according to Supplementary Note 10 satisfies Conditional Formula (9-1) represented by the following formula: 0<ft / fRe<200 (9-1).

[0445] [Note 12]

[0446] The zoom lens according to Supplementary Note 10 satisfies Conditional Formula (9-6) represented by the following formula: -100<ft / fRe<0 (9-6).

[0447] [Note 13]

[0448] A zoom lens according to any one of Supplementary Notes 1 to 12, wherein:

[0449] The zoom lens includes a focus group that moves when focusing.

[0450] The lateral magnification of the focus group in a state where the focus is focused on an infinitely distant object at the telephoto end is βfoc,

[0451] When the combined lateral magnification of all lenses closer to the image side than the focus group in a state of focusing on an infinitely distant object at the telephoto end is βfocR,

[0452] The zoom lens satisfies the conditional equation (10) represented by the following equation:

[0453] |(1-βfoc 2 )×βfocR 2 |<50 (10).

[0454] [Note 14]

[0455] A zoom lens according to any one of Supplementary Notes 1 to 13, wherein:

[0456] The front lens group closest to the object side includes at least one cemented lens.

[0457] [Note 15]

[0458] The zoom lens according to any one of Supplementary Notes 1 to 14, wherein:

[0459] The front lens group closest to the object side includes at least one positive lens having an Abbe number of 70 or more based on the d-line.

[0460] [Note 16]

[0461] A zoom lens according to any one of Supplementary Notes 1 to 15, wherein:

[0462] The front lens group closest to the object side includes at least one negative lens having an Abbe number of 60 or less based on d-line.

[0463] [Note 17]

[0464] A zoom lens according to any one of Supplementary Notes 1 to 16, wherein:

[0465] The lens group closest to the object side of the intermediate group includes at least one positive lens having an Abbe number of 40 or less based on d-line.

[0466] [Note 18]

[0467] A zoom lens according to any one of Supplementary Notes 1 to 17, wherein:

[0468] The lens group closest to the object in the middle group includes at least one positive lens and at least two negative lenses.

[0469] [Note 19]

[0470] A zoom lens according to any one of Supplementary Notes 1 to 18, which satisfies Conditional Formula (1-1) represented by the following formula,

[0471] 0.8<(ft / fw) / Movmax (1-1).

[0472] [Note 20]

[0473] An imaging device comprising the zoom lens according to any one of Supplementary Notes 1 to 19.

Claims

1. A zoom lens, comprising, in order from the object side to the image side, a front group, a middle group and a rear group, The front group includes no more than 2 lens groups with positive optical power, The lens group closest to the object side of the front group is fixed relative to the image plane when the magnification is changed. The intermediate group includes no more than two lens groups with negative optical power, The rear group includes a plurality of lens groups, The lens group closest to the object in the rear group has positive refractive power. The lens group closest to the image side of the rear group is fixed relative to the image plane when changing the magnification. When changing magnification, all the intervals between adjacent lens groups change. When the focal length of the entire system is set to ft, The focal length of the entire system at the wide-angle end when focusing on an object at infinity is fw. Among the lens groups that move when zooming, the displacement of the lens group with the largest displacement from the wide angle end to the telephoto end when zooming is defined as Movmax, When the unit of Movmax is set to mm, The zoom lens satisfies the conditional formula (1) represented by the following formula: 0.4<(ft / fw) / Movmax (1).

2. The zoom lens according to claim 1, wherein: The sum of the distance on the optical axis from the lens surface of the front group closest to the object side to the lens surface of the rear group closest to the image side in a state of focusing on an infinitely distant object and the back focal length in the air conversion distance of the entire system is set as TL, When the maximum image height is set to Y, The zoom lens satisfies the conditional formula (2) represented by the following formula: TL / 2Y<80 (2).

3. The zoom lens according to claim 1 or 2, which satisfies the conditional formula (1-1) represented by the following formula: 0.8<(ft / fw) / Movmax (1-1).

4. The zoom lens according to claim 1 or 2, wherein: When the sum of the distance on the optical axis from the lens surface closest to the object side of the front group to the lens surface closest to the image side of the rear group in a state of focusing on an infinitely distant object and the back focus at the air conversion distance of the entire system is defined as TL, The zoom lens satisfies the conditional formula (3) represented by the following formula: 2 <ft / TL (3)。 5. The zoom lens according to claim 1 or 2, wherein: When the back focal length of the entire system at the air conversion distance is set to Bf, The zoom lens satisfies the conditional equation (4) represented by the following equation: 10 <ft / Bf (4)。 6. The zoom lens according to claim 1 or 2, wherein: When the maximum image height is set to Y, The zoom lens satisfies the conditional equation (5) represented by the following equation: 30 <ft / 2Y (5)。 7. The zoom lens according to claim 1 or 2, wherein: When the focal length of the lens group closest to the object in the front group is set to fF1, The zoom lens satisfies the conditional equation (6) represented by the following equation: 0.5 <ft / fF1 (6)。 8. The zoom lens according to claim 1 or 2, wherein: When the focal length of the lens group closest to the object in the intermediate group is set to fM1, The zoom lens satisfies the conditional equation (7) represented by the following equation: 5<|ft / fM1| (7).

9. The zoom lens according to claim 1 or 2, wherein: The lens group closest to the object side of the front group includes at least 4 lenses. The third lens group from the object side of the rear group includes an aspherical lens.

10. The zoom lens according to claim 1 or 2, wherein: When the focal length of the lens group closest to the object in the rear group is set to fR1, The zoom lens satisfies the conditional equation (8) represented by the following equation: 0 <ft / fR1<100 (8)。 11. The zoom lens according to claim 1 or 2, wherein: When the focal length of the lens group closest to the image side of the rear group is fRe, The zoom lens satisfies the conditional equation (9) represented by the following equation: -100 <ft / fRe<200 (9)。 12. The zoom lens according to claim 11, which satisfies the conditional expression (9-1) represented by the following expression: 0 <ft / fRe<200 (9-1)。 13. The zoom lens according to claim 11, which satisfies the conditional expression (9-6) represented by the following expression: -100 <ft / fRe<0 (9-6)。 14. The zoom lens according to claim 1 or 2, wherein: The zoom lens includes a focus group that moves when focusing. The lateral magnification of the focus group in a state where the focus is focused on an infinitely distant object at the telephoto end is βfoc, When the combined lateral magnification of all lenses closer to the image side than the focus group in a state of focusing on an infinitely distant object at the telephoto end is β focR, The zoom lens satisfies the conditional equation (10) represented by the following equation: |(1-βfoc 2 )×βfocR 2 |<50 (10)。 15. The zoom lens according to claim 1 or 2, wherein: The front lens group closest to the object side includes at least one cemented lens.

16. The zoom lens according to claim 1 or 2, wherein: The front lens group closest to the object side includes at least one positive lens having an Abbe number of 70 or more based on the d-line.

17. The zoom lens according to claim 1 or 2, wherein: The front lens group closest to the object side includes at least one negative lens having an Abbe number of 60 or less based on d-line.

18. The zoom lens according to claim 1 or 2, wherein: The lens group closest to the object in the intermediate group includes at least one positive lens having an Abbe number of 40 or less based on d-line.

19. The zoom lens according to claim 1 or 2, wherein: The lens group closest to the object in the middle group includes at least one positive lens and at least two negative lenses. 20 . An imaging device comprising the zoom lens according to claim 1 .

Images