CN211928290U - Zoom lens and image pickup apparatus - Google Patents

Zoom lens and image pickup apparatus Download PDF

Info

Publication number
CN211928290U
CN211928290U CN201890001294.1U CN201890001294U CN211928290U CN 211928290 U CN211928290 U CN 211928290U CN 201890001294 U CN201890001294 U CN 201890001294U CN 211928290 U CN211928290 U CN 211928290U
Authority
CN
China
Prior art keywords
lens
sub
zoom
zoom lens
positive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201890001294.1U
Other languages
Chinese (zh)
Inventor
小松大树
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujifilm Corp
Original Assignee
Fujifilm Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2017204591A priority Critical patent/JP2019078849A/en
Priority to JP2017-204591 priority
Application filed by Fujifilm Corp filed Critical Fujifilm Corp
Priority to PCT/JP2018/037630 priority patent/WO2019082641A1/en
Application granted granted Critical
Publication of CN211928290U publication Critical patent/CN211928290U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/163Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses

Abstract

The utility model provides a small-size, wide visual angle, high performance's zoom and possess this zoom's camera device. The zoom lens includes, in order from the object side, a positive 1 st lens group, a negative 2 nd lens group, a positive 3 rd lens group, and a positive 4 th lens group. In the magnification change, the 1 st lens group and the 4 th lens group do not move, and the 2 nd lens group and the 3 rd lens group move. The 1 st lens group includes, in order from the object side, a negative 1A sub-lens group that does not move during focusing, a positive 1B sub-lens group that moves during focusing, and a positive 1C sub-lens group that does not move during focusing. Conditional expressions regarding the focal length f1A of the 1 st sub-lens group, the focal length f1 of the 1 st lens group are satisfied: -1.47 < f1A/f1 < -1.08.

Description

Zoom lens and image pickup apparatus
Technical Field
The utility model relates to a zoom and camera device.
Background
Conventionally, a zoom lens having a 4-group structure has been proposed as a lens system to be mounted in a broadcasting camera, a movie camera, or the like. For example, patent documents 1 and 2 listed below describe a zoom lens in which a 1 st lens group having positive refractive power, a 2 nd lens group having negative refractive power, a 3 rd lens group having refractive power, and a 4 th lens group having positive refractive power are arranged in this order from the object side toward the image side.
Prior art documents
Patent document
Patent document 1: japanese laid-open patent publication No. 2017-026976
Patent document 2: japanese patent laid-open No. 2014-232313
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved by the utility model
In conventional broadcasting cameras, cameras equipped with HD (High definition) sensors are the mainstream, but it is considered that in the future, imaging by cameras equipped with 4K (about 800 ten thousand pixels) sensors with 4 times the number of pixels will increase. Recently, among the movie cameras, there are many cameras having a pixel number of 4K or more, and 4K shooting is increasing. Cameras equipped with 8K (about 3300 ten thousand pixels) sensors having a pixel count of 4K or more are also on the market. Cameras equipped with such high-pixel sensors are required to use lenses with higher performance. In particular, in the case of a zoom lens, bleeding is likely to occur at the wide-angle end, and is likely to become conspicuous due to changes in the imaging environment of a light source, a camera, and the like.
Zoom lenses used in broadcasting cameras and movie cameras are required to have a wide angle of view from the viewpoint of ease of use. On the other hand, since the camera is compatible with an imaging system in which mobility and operability are important, further miniaturization of the camera is required, and miniaturization of the zoom lens mounted thereon is also required.
However, the zoom lens described in patent document 1 has a large effective lens diameter and is insufficient for miniaturization. Further, the zoom lens described in patent document 2 is expected to further correct aberrations in response to recent demands for high performance.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a zoom lens having a small size and a wide angle of view and high optical performance, and an image pickup apparatus including the zoom lens.
Means for solving the technical problem
In order to solve the above problems, the zoom lens of the present invention includes only 4 lens groups including a 1 st lens group having positive refractive power, a 2 nd lens group having negative refractive power, a 3 rd lens group having positive refractive power, and a 4 th lens group having positive refractive power as lens groups in order from an object side toward an image side, wherein an aperture is disposed between a surface of the 3 rd lens group closest to the image side and an image surface, and wherein the 1 st lens group and the 4 th lens group are fixed with respect to the image surface during magnification, the 2 nd lens group and the 3 rd lens group are moved by changing an interval in an optical axis direction, the 1 st lens group includes a 1A sub-lens group having negative refractive power fixed with respect to the image surface during focusing, a 1B sub-lens group having positive refractive power moved in the optical axis direction during focusing, and a 1C sub-lens group having positive refractive power fixed with respect to the image surface at, in the case where the focal length of the 1 st sub-lens group is f1A and the focal length of the 1 st lens group upon focusing on an infinite object is f1, the zoom lens satisfies the following conditional expression (1),
-1.47<f1A/f1<-1.08 (1),
in the case where the Abbe number of d-line reference of the positive lens in the 1A sub-lens group is set to ν 1Ap, the average value of Abbe number of d-line reference of all the negative lenses in the 1A sub-lens group is set to ν 1Ana, the partial dispersion ratio between g-line and F-line of the positive lens in the 1A sub-lens group is set to θ gF1Ap, and the average value of partial dispersion ratio between g-line and F-line of all the negative lenses in the 1A sub-lens group is set to θ gF1Ana, the 1A sub-lens group has at least 1 positive lens satisfying the following conditional expressions (2) and (3),
19<ν1Ana-ν1Ap<31 (2);
0.046<θgF1Ap-θgF1Ana<0.071 (3)。
in the zoom lens of the present invention, it is preferable that at least 1 of the positive lenses of the 1A-th sub-lens group satisfying the conditional expressions (2) and (3) satisfies the following conditional expressions (2-1) and/or (3-1).
21<ν1Ana-ν1Ap<30 (2-1)
0.051<θgF1Ap-θgF1Ana<0.068 (3-1)
In the zoom lens of the present invention, when a distance difference in the optical axis direction between the position of the 3 rd lens group at the wide angle end and the position of the 3 rd lens group at the telephoto end is Z3, and the focal length of the 3 rd lens group is f3, the following conditional expression (4) is preferably satisfied, and the following conditional expression (4-1) is more preferably satisfied.
1<Z3/f3<1.4 (4)
1.05<Z3/f3<1.22 (4-1)
In the zoom lens of the present invention, it is preferable that the following conditional expression (5) is satisfied when f1Cp is a focal length of a shortest positive lens among the positive lenses in the 1C sub-lens group and f1C is a focal length of the 1C sub-lens group.
1.9<f1Cp/f1C<2.25 (5)
In the zoom lens of the present invention, when the focal length of the 2 nd lens group is f2 and the focal length of the 3 rd lens group is f3, the following conditional expression (6) is preferably satisfied, and the following conditional expression (6-1) is more preferably satisfied.
-0.58<f2/f3<-0.38 (6)
-0.5<f2/f3<-0.38 (6-1)
In the zoom lens of the present invention, when zooming from the wide-angle end to the telephoto end, it is preferable that the 2 nd lens group and the 3 rd lens group pass through respective points of which imaging magnifications are-1 times at the same time.
The utility model discloses a camera device possesses the utility model discloses a zoom.
In addition, the expressions "including" and "including" in the present specification may include, in addition to the constituent elements listed as constituent elements: a lens having substantially no optical power; optical elements other than lenses, such as a diaphragm, a filter, and a cover glass; and mechanism parts such as lens flanges, lens barrels, imaging elements, and hand shake correction mechanisms.
In the present specification, "group having positive refractive power" means that the entire group has positive refractive power. Similarly, "group having negative refractive power" means that the group as a whole has negative refractive power. The "lens group" and the "sub-lens group" do not necessarily have to be constituted by a plurality of lenses, and may include a lens group constituted by only 1 lens. Regarding the sign of the refractive power, a lens including an aspherical surface is set to be considered in the paraxial region. Unless otherwise specified, the conditional expression is based on a d-line (wavelength 587.6nm (nm)).
When the refractive indices of the lens with respect to g-line (wavelength 435.8nm (nm)), F-line (wavelength 486.1nm (nm)) and C-line (wavelength 656.3nm (nm)) are given as Ng, NF and NC, respectively, the partial dispersion ratio θ gF between g-line and F-line of one lens is defined by θ gF ═ Ng (Ng-NF)/(NF-NC).
Effect of the utility model
According to the utility model discloses, can provide a small-size and wide visual angle, have high optical performance's zoom and possess this zoom's camera device.
Drawings
Fig. 1 is a diagram showing a sectional view and a movement locus of a lens structure at a wide-angle end of a zoom lens according to an embodiment of the present invention (a zoom lens according to embodiment 1 of the present invention).
Fig. 2 is a cross-sectional view showing a lens structure and an optical path at a wide angle end, an intermediate focal length state, and a telephoto end in the zoom lens according to embodiment 1 of the present invention.
Fig. 3 is a view showing a sectional view and a movement locus of a lens structure at the wide-angle end in the zoom lens according to embodiment 2 of the present invention.
Fig. 4 is a view showing a sectional view and a movement locus of a lens structure at the wide-angle end in the zoom lens according to embodiment 3 of the present invention.
Fig. 5 is a view showing a sectional view and a movement locus of a lens structure at the wide-angle end in the zoom lens according to embodiment 4 of the present invention.
Fig. 6 is a view showing a sectional view and a movement locus of a lens structure at the wide-angle end in the zoom lens according to embodiment 5 of the present invention.
Fig. 7 is each aberration diagram of the zoom lens according to embodiment 1 of the present invention.
Fig. 8 is each aberration diagram of the zoom lens according to embodiment 2 of the present invention.
Fig. 9 is each aberration diagram of the zoom lens according to embodiment 3 of the present invention.
Fig. 10 is each aberration diagram of the zoom lens according to embodiment 4 of the present invention.
Fig. 11 is each aberration diagram of the zoom lens according to embodiment 5 of the present invention.
Fig. 12 is a schematic configuration diagram of an imaging apparatus according to an embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1 shows a cross-sectional view of a zoom lens according to an embodiment of the present invention at a wide-angle end, and fig. 2 shows a cross-sectional view and an optical path of the zoom lens at each state. The examples shown in fig. 1 and 2 correspond to a zoom lens system according to embodiment 1 described later. In fig. 1 and 2, the left side of the drawing sheet is the object side, and the right side of the drawing sheet is the image side, showing a state of focusing on an object at infinity. In fig. 2, the WIDE-angle end state is shown in the upper row labeled "WIDE", the intermediate focal length state is shown in the MIDDLE row labeled "MIDDLE", and the TELE end state is shown in the lower row labeled "TELE". Fig. 2 shows, as luminous fluxes, an on-axis luminous flux wa and a luminous flux wb at the maximum viewing angle in the wide-angle end state, an on-axis luminous flux ma and a luminous flux mb at the maximum viewing angle in the intermediate focal length state, and an on-axis luminous flux ta and a luminous flux tb at the maximum viewing angle in the telephoto end state. Hereinafter, description will be made mainly with reference to fig. 1.
The zoom lens of the present embodiment includes, as lens groups, 4 lens groups including, in order from the object side to the image side along the optical axis Z, a 1 st lens group G1 having positive refractive power, a 2 nd lens group G2 having negative refractive power, a 3 rd lens group G3 having positive refractive power, and a 4 th lens group G4 having positive refractive power. An aperture stop St is disposed between the image plane Sim and the most image-side surface of the 3 rd lens group G3. By setting the lens group closest to the object side to a lens group having positive refractive power, the total length of the lens system can be shortened, which is advantageous for downsizing.
In the example of fig. 1, the 1 st lens group G1 includes 12 lenses, i.e., lenses L1a to L1L, in order from the object side to the image side, the 2 nd lens group G2 includes 5 lenses, i.e., lenses L2a to L2e, in order from the object side to the image side, the 3 rd lens group G3 includes 5 lenses, i.e., lenses L3a to L3e, in order from the object side to the image side, and the 4 th lens group G4 includes 11 lenses, i.e., lenses L4a to L4k, in order from the object side to the image side.
Fig. 1 shows an example in which an optical member PP having an incident surface parallel to an exit surface is disposed between the zoom lens and the image plane Sim. The optical member PP is a member assumed to be various filters, prisms, cover glass, and the like. Examples of the various filters include a low-pass filter, an infrared cut filter, and a filter that cuts a specific wavelength region. The optical member PP of fig. 1 includes 2 members, but the number of members constituting the optical member PP can be arbitrarily selected, and the optical member PP may be omitted.
In the zoom lens of the present embodiment, at the time of magnification change, the 1 st lens group G1 and the 4 th lens group G4 are fixed with respect to the image plane Sim, and the 2 nd lens group G2 and the 3 rd lens group G3 move with changing the interval between each other in the optical axis direction, respectively. That is, at the time of magnification change, the 2 nd lens group G2 and the 3 rd lens group G3 move in the optical axis direction with different trajectories from each other, and the interval in the optical axis direction between the adjacent lens groups changes. In fig. 1, a schematic trajectory of each lens group when zooming from the wide-angle end to the telephoto end is shown by an arrow below the 2 nd lens group G2 and the 3 rd lens group G3. In the example of fig. 1, the aperture stop St is fixed with respect to the image plane Sim during magnification variation, but the aperture stop St may be configured to move in the optical axis direction during magnification variation. In the zoom lens according to the present embodiment, the lens group closest to the object side and the lens group closest to the image side are fixed at the time of magnification change, and therefore the total length of the lens system can be kept constant at the time of magnification change.
The 1 st lens group G1 includes, in order from the object side toward the image side, a 1 st a sub-lens group G1A having negative refractive power and fixed with respect to an image plane Sim at the time of focusing, a 1 st B sub-lens group G1B having positive refractive power and moving in the optical axis direction at the time of focusing, and a 1 st C sub-lens group G1C having positive refractive power and fixed with respect to the image plane Sim at the time of focusing. With this configuration, it is possible to suppress a change in angle of view during focusing and suppress a change in aberration during focusing when the subject distance changes. Further, an arrow in the horizontal direction below the 1B sub-lens group G1B in fig. 1 indicates that the 1B sub-lens group G1B moves in the optical axis direction when focusing from an infinite object to a close object.
When the focal length of the 1A sub-lens group G1A is f1A and the focal length of the 1 lens group G1 when focusing on an infinitely distant object is f1, the zoom lens of the present embodiment satisfies the following conditional expression (1). Since the refractive power of the 1A sub-lens group G1A is not excessively reduced with respect to the strength of the refractive power of the 1 st lens group G1 by not being equal to or less than the lower limit of the conditional expression (1), it is possible to secure the negative refractive power of the 1 st sub-lens group G1A in the 1 st lens group G1 which is a positive lens group, to easily correct chromatic aberration of magnification at the wide angle end and spherical aberration at the telephoto end, and to suppress variation in angle of view at the time of focusing. By setting the refractive power of the 1A sub-lens group G1A not to be equal to or higher than the upper limit of the conditional expression (1), the refractive power of the 1A sub-lens group G1A is not excessively increased with respect to the strength of the refractive power of the 1 st lens group G1, and therefore, the positive refractive power of the 1 st lens group G1 can be ensured. This can suppress the increase in the distance between the 1 St lens group G1 and the 4 th lens group G4, and can contribute to the reduction in the distance from the 1 St lens group G1 to the aperture stop St, and therefore can suppress the effective diameter of the lens in the 1 St lens group G1, which is likely to increase the diameter in a wide-angle lens system, and is advantageous for downsizing.
-1.47<f1A/f1<-1.08 (1)
In the zoom lens according to the present embodiment, when the d-line reference dispersion coefficient of the positive lens in the 1A sub-lens group G1A is ν 1Ap, the average value of the d-line reference dispersion coefficients of all the negative lenses in the 1A sub-lens group G1A is ν 1Ana, the partial dispersion ratio between the G-line and the F-line of the positive lens in the 1A sub-lens group G1A is θ gF1Ap, and the average value of the partial dispersion ratios between the G-line and the F-line of all the negative lenses in the 1A sub-lens group G1A is θ gF1Ana, the 1A sub-lens group G1A includes at least 1 positive lens satisfying the following conditional expressions (2) and (3).
19<ν1Ana-ν1Ap<31 (2)
0.046<θgF1Ap-θgF1Ana<0.071 (3)
By setting the lower limit of conditional expression (2) or less, it is easy to correct chromatic aberration of magnification at the wide-angle end and chromatic aberration on-axis at the telephoto end. Since the refractive index of the negative lens in the 1A sub-lens group G1A does not become too low by not being equal to or higher than the upper limit of the conditional expression (2), it is not necessary to reduce the absolute value of the radius of curvature to secure the refractive power, and the 1A sub-lens group G1A can be suppressed from becoming long. Further, when at least 1 positive lens satisfying the conditional expressions (2) and (3) satisfies the following conditional expression (2-1), the lens can have more favorable characteristics.
21<ν1Ana-ν1Ap<30 (2-1)
By satisfying the conditional expression (3) together with the conditional expression (2), correction of the secondary spectrum is facilitated. Further, when at least 1 positive lens satisfying the conditional expressions (2) and (3) satisfies the following conditional expression (3-1), the lens can have more favorable characteristics.
0.051<θgF1Ap-θgF1Ana<0.068 (3-1)
In the zoom lens according to the present embodiment, it is preferable that the following conditional expression (4) is satisfied, where Z3 is a distance difference in the optical axis direction between the position of the 3 rd lens group G3 at the wide angle end and the position of the 3 rd lens group G3 at the telephoto end, and f3 is a focal length of the 3 rd lens group G3. By setting the refractive power of the 3 rd lens group G3 to be not too low as the lower limit of conditional expression (4), the back focal length is not too long, which is advantageous for downsizing. By setting the upper limit of conditional expression (4) or more, Z3 does not become too large, which is advantageous for downsizing. Further, by setting the refractive power of the 3 rd lens group G3 not to be more than the upper limit of the conditional expression (4), the spherical aberration on the telephoto side and the on-axis chromatic aberration are easily corrected. Further, a structure satisfying the following conditional expression (4-1) can provide more favorable characteristics.
1<Z3/f3<1.4 (4)
1.05<Z3/f3<1.22 (4-1)
In the zoom lens according to the present embodiment, it is preferable that the following conditional expression (5) is satisfied where f1Cp is a focal length of a shortest positive lens among the positive lenses in the 1C sub-lens group G1C, and f1C is a focal length of the 1C sub-lens group G1C. The conditional expression (5) is an expression relating to the refractive power of the positive lens having the strongest refractive power in the 1C sub-lens group G1C, that is, the positive lens having a large influence in the 1C sub-lens group G1C. Satisfying the conditional expression (5) is advantageous for correcting the aberration while maintaining a good balance between the spherical aberration of the lower order and the spherical aberration of the higher order. Here, the high order represents 5 th order or more, and the low order represents 3 rd order or less.
1.9<f1Cp/f1C<2.25 (5)
In the zoom lens according to the present embodiment, it is preferable that the following conditional expression (6) is satisfied where f2 denotes a focal length of the 2 nd lens group G2 and f3 denotes a focal length of the 3 rd lens group G3. Satisfying conditional expression (6) makes it possible to maintain the ratio of refractive powers of the 2 nd lens group G2 as a negative lens group and the 3 rd lens group G3 as a positive lens group within an appropriate range, which is advantageous in suppressing variation in chromatic aberration of magnification at the time of magnification variation, variation in axial chromatic aberration at the time of magnification variation, and variation in spherical aberration at the time of magnification variation. Further, a structure satisfying the following conditional expression (6-1) can provide more favorable characteristics.
-0.58<f2/f3<-0.38 (6)
-0.5<f2/f3<-0.38 (6-1)
Further, in the zoom lens according to the present embodiment, it is preferable that the 2 nd lens group G2 and the 3 rd lens group G3 simultaneously pass through a point at which their respective imaging magnifications are-1 times when varying the magnification from the wide angle end to the telephoto end. In this case, it is advantageous to ensure a high zoom ratio. Positions in a movement locus where the imaging magnification of each of the 2 nd lens group G2 and the 3 rd lens group G3 becomes-1 times are shown by a broken line in the horizontal direction in fig. 1.
In the example shown in fig. 1, the optical member PP is disposed between the lens system and the image plane Sim, but instead of disposing a low-pass filter and/or various filters for blocking light of a specific wavelength range between the lens system and the image plane Sim, these various filters may be disposed between the lenses, or a coating having the same function as that of the various filters may be applied to the lens surface of any of the lenses.
The above-described preferred configurations and possible configurations can be arbitrarily combined, and are preferably selected and used as appropriate according to the required specifications. According to the present embodiment, a zoom lens having a small size, a wide angle of view, and high optical performance can be realized. The "wide angle" as used herein means a total angle of view at the wide angle end of 80 degrees or more.
Next, numerical embodiments of the zoom lens of the present invention will be described.
[ example 1]
The cross-sectional view of the zoom lens system according to embodiment 1 is shown in fig. 1 and 2, and the method of illustrating the same is as described above, and therefore a part of the repetitive description thereof is omitted here. The zoom lens of embodiment 1 includes, in order from the object side toward the image side, a 1 St lens group G1 having positive refractive power, a 2 nd lens group G2 having negative refractive power, a 3 rd lens group G3 having positive refractive power, an aperture stop St, and a 4 th lens group G4 having positive refractive power. At the time of magnification change, the 1 St lens group G1, the aperture stop St, and the 4 th lens group G4 are fixed with respect to the image plane Sim, and the 2 nd lens group G2 and the 3 rd lens group G3 move in the optical axis direction with different trajectories from each other. The 1 st lens group G1 includes, in order from the object side toward the image side, a 1 st a sub-lens group G1A fixed with respect to the image plane Sim at the time of focusing, a 1 st B sub-lens group G1B having positive refractive power moving from an infinity object to a close object at the time of focusing, and a 1 st C sub-lens group G1C fixed with respect to the image plane Sim at the time of focusing. The 1A sub-lens group G1A includes 4 lenses, i.e., lenses L1A to L1d, in order from the object side to the image side. The 1B sub-lens group G1B includes 3 lenses, i.e., lenses L1e to L1G, in order from the object side to the image side. The 1C sub-lens group G1C includes 5 lenses L1h to L1L in order from the object side to the image side. The 2 nd lens group G2 includes 5 lenses, i.e., lenses L2a to L2e, in order from the object side to the image side. The 3 rd lens group G3 includes 5 lenses, i.e., lenses L3a to L3e, in order from the object side to the image side. The 4 th lens group G4 includes 11 lenses, i.e., lenses L4a to L4k, in order from the object side to the image side. The above is an outline of the zoom lens system of embodiment 1.
Table 1 shows basic lens data of the zoom lens of example 1, table 2 shows specifications and variable surface distances, and table 3 shows aspherical surface coefficients. In table 1, the area number column indicates the area number when the most object-side area is the 1 st area and the number is increased one by one toward the image side, the area column indicates the radius of curvature of each area, and the area column indicates the area interval on the optical axis between each area and the adjacent area on the image side. The refractive index of each component element with respect to the d-line is shown in the Nd column, the d-line-based dispersion coefficient of each component element is shown in the vd column, and the partial dispersion ratio between the g-line and the F-line of each component element is shown in the θ gF column.
In table 1, the sign of the radius of curvature of the surface of the shape in which the convex surface faces the object side is positive, and the sign of the radius of curvature of the surface of the shape in which the convex surface faces the image side is negative. Table 1 also shows the aperture stop St and the optical member PP. In table 1, the term (St) is described in the column of the surface number corresponding to the surface of the aperture stop St together with the surface number. The value in the lowermost column of D in table 1 is the distance between the image plane Sim and the surface closest to the image side in the table. In table 1, the variable surface interval at the time of magnification change is denoted by DD [ ], and the object-side surface number of the interval is denoted by [ ]andis shown in the column D.
Table 2 shows the values of the zoom ratio Zr, the focal length F, the F value fno, the maximum full view angle 2 ω, and the variable surface interval on the d-line basis. The (°) column 2 ω represents units of degrees. In table 2, the respective values of the WIDE-angle end state, the intermediate focal length state, and the telephoto end state are shown in columns labeled WIDE, MIDDLE, and TELE, respectively. Table 1 and table 2 show respective values of the state of focusing on an infinite object.
In table 1, the aspheric surface is denoted by a symbol, and the column of the curvature radius of the aspheric surface shows the numerical value of the paraxial curvature radius. The aspheric surface numbers and aspheric surface coefficients associated with the respective aspheric surfaces are shown in table 3."E. + -. n" (n: integer) of numerical values of aspherical surface coefficients of Table 3 represents ". times.10±n". The aspherical surface coefficient is a value of each of coefficients KA and Am (m is 4, 6, 8, and … …) in an aspherical surface formula expressed by the following expression.
Zd=C×h2/{1+(1-KA×C2×h2)1/2}+∑Am×hm
Wherein the content of the first and second substances,
and (d) is as follows: aspheric depth (length of a perpendicular line that depends from a point on the aspheric surface of height h to a plane tangent to the aspheric vertex and perpendicular to the optical axis);
h: height (distance from optical axis to lens surface)
C: paraxial curvature;
KA. Am, and (2): the coefficient of the aspherical surface is,
the aspherical Σ represents a sum associated with m.
In the data of each table, degrees are used as a unit of angle, mm (millimeter) is used as a unit of length, and the optical system can be used in an enlarged scale or in a reduced scale. In each table shown below, numerical values rounded to a predetermined number of digits are shown.
[ Table 1]
Example 1
Noodle numbering R D Nd νd θgF
1 385.2971 4.000 1.77250 49.60 0.55212
2 103.8530 35.778
3 -1099.8787 3.500 1.83501 44.50 0.55862
4 1495.5799 12.995
5 -256.7911 3.500 1.80500 47.50 0.55318
6 998.7359 1.000
7 323.5907 12.611 1.80518 25.43 0.61027
8 -1458.8251 3.204
9 -999.0022 3.500 1.80518 25.43 0.61027
10 534.3154 23.311 1.43875 94.94 0.53433
11 -182.3211 0.120
12 -1123.9264 8.637 1.43387 95.18 0.53733
13 -282.2255 31.988
14 205.0671 19.175 1.43387 95.18 0.53733
15 -695.2448 0.120
16 199.8954 3.600 1.85025 30.05 0.59797
17 138.8945 4.963
18 180.7385 25.093 1.43387 95.18 0.53733
19 -300.4769 0.120
20 220.8769 13.000 1.49700 81.54 0.53748
21 -10293.9437 0.120
22 124.4904 9.510 1.55032 75.50 0.54001
23 216.9978 DD[23]
*24 208.3730 2.000 1.59216 61.46 0.54196
25 83.8466 4.036
26 -213.4127 1.700 1.81628 46.37 0.55513
27 45.3722 9.144
28 -44.7824 1.700 1.79977 48.02 0.55232
29 71.4393 12.072 1.80518 25.43 0.61027
30 -43.3655 1.700 1.80400 46.57 0.55724
31 -117.6938 DD[31]
32 134.9830 7.794 1.43875 94.94 0.53433
33 -175.4891 0.120
34 176.4713 4.948 1.43875 94.94 0.53433
*35 -356.7125 0.120
36 176.0297 2.000 1.84666 23.83 0.61603
37 77.8112 10.134 1.49700 81.54 0.53748
38 -187.5656 0.120
39 320.7159 4.932 1.49700 81.54 0.53748
40 -208.4661 DD[40]
41(St) 7.714
42 -59.9005 1.800 1.72879 55.06 0.54273
43 33.8348 6.963 1.80518 25.43 0.61027
44 -115.9650 1.239
45 -56.3392 1.800 1.80400 46.57 0.55724
46 63.9767 6.222 1.80518 25.43 0.61027
47 132.9266 8.129
48 -92.5576 5.635 1.58795 61.62 0.54188
49 -40.1519 18.103
50 -3348.3638 1.800 1.90473 33.26 0.58844
51 61.3065 7.046 1.54980 63.08 0.54051
52 -85.2346 0.856
53 42.8510 1.800 1.80518 25.42 0.61616
54 32.4972 10.055 1.48749 70.24 0.53007
55 -78.4804 0.120
56 52.2312 1.800 1.91082 35.25 0.58224
57 23.4884 7.221 1.61800 63.33 0.54414
58 179.4649 5.000
59 33.000 1.60859 46.44 0.56664
60 13.200 1.51633 64.05 0.53463
61 8.806
[ Table 2]
Example 1
WIDE middle TELE
Zr 1.00 5.20 27.00
f 6.51 33.80 175.64
FNo. 1.54 1.54 2.27
2ω(°) 84.4 17.8 3.6
DD[23] 3.79 67.19 91.14
DD[31] 161.66 72.91 1.48
DD[40] 1.88 27.23 74.71
[ Table 3]
Example 1
Noodle numbering 24 35
KA 8.53962266E+00 -7.04245401E+01
A4 1.05250629E-06 3.30702466E-07
A6 -1.49654653E-13 -1.99057453E-10
A8 -2.98761901E-12 9.29373387E-13
A10 3.28010378E-14 -1.86783041E-15
A12 -1.48849127E-16 1.76265558E-18
A14 3.49372703E-19 -2.95485592E-22
A16 -4.14102241E-22 -8.27213895E-25
A18 1.96487523E-25 6.48376342E-28
A20 0.00000000E+00 -1.48721886E-31
Fig. 7 shows aberration diagrams in order from the left in a state where the zoom lens system according to embodiment 1 is focused on an object at infinity. Fig. 7 shows spherical aberration, astigmatism, distortion aberration, and chromatic aberration of magnification in this order from the left. In fig. 7, aberration diagrams in the WIDE-angle end state are shown in the upper row on the scale WIDE, aberration diagrams in the intermediate focal length state are shown in the MIDDLE row on the scale midle, and aberration diagrams in the telephoto end state are shown in the lower row on the scale TELE. In the spherical aberration diagram, aberrations in d-line, C-line, and F-line are shown by a solid black line, a long dashed line, and a short dashed line, respectively. In the astigmatism diagrams, aberrations in d-line in the sagittal direction are shown by solid lines, and aberrations in d-line in the meridional direction are shown by short dashed lines. In the distortion aberration diagram, the aberration under the d-line is shown with a solid line. In the chromatic aberration of magnification map, aberrations in the C, F and g lines are shown by long dashed lines, short dashed lines and two-dot chain lines, respectively. Fno of the spherical aberration diagram indicates the F value, and ω of the other aberration diagrams indicates the half angle of view.
The symbols, meanings, and description methods of the respective data described in the above description of embodiment 1 are the same in the following embodiments unless otherwise specified, and therefore, the repetitive description thereof will be omitted below.
[ example 2]
Fig. 3 is a sectional view of the zoom lens system according to embodiment 2. The zoom lens of embodiment 2 has the same configuration as the outline of the zoom lens of embodiment 1. Table 4 shows basic lens data of the zoom lens of example 2, table 5 shows specifications and variable surface distances, table 6 shows aspherical coefficients, and fig. 8 shows aberrations in a state of focusing on an object at infinity.
[ Table 4]
Example 2
Noodle numbering R D Nd νd θgF
1 133.2729 4.100 1.77250 49.60 0.55212
2 83.1562 51.066
3 -660.9634 3.600 1.83499 44.50 0.55861
4 354.5742 20.784
5 -193.2525 3.600 1.80499 47.50 0.55318
6 2777.9698 1.000
7 405.2777 11.489 1.80518 25.43 0.61027
8 -815.4184 4.716
9 -594.5505 3.600 1.80518 25.43 0.61027
10 670.1420 24.240 1.43875 94.94 0.53433
11 -154.8271 0.120
12 -2193.5052 8.825 1.43387 95.18 0.53733
13 -309.5874 24.293
14 351.9471 18.823 1.43387 95.18 0.53733
15 -371.5952 0.120
16 222.1674 3.700 1.85025 30.05 0.59797
17 166.2807 6.400
18 240.5131 30.000 1.43387 95.18 0.53733
19 -208.1570 0.120
20 201.0340 12.075 1.49700 81.54 0.53748
21 778.1627 0.120
22 116.3713 10.277 1.55032 75.50 0.54001
23 183.3167 DD[23]
*24 171.1551 2.000 1.51801 64.31 0.53824
25 78.4807 3.174
26 1190.8955 1.700 1.85582 42.42 0.56287
27 43.1117 12.310
28 -39.6402 1.700 1.80000 48.00 0.55236
29 126.4970 11.957 1.80518 25.43 0.61027
30 -40.1510 1.700 1.80400 46.57 0.55724
31 -91.7330 DD[31]
32 171.1850 8.614 1.43875 94.94 0.53433
33 -167.7751 0.120
34 134.8192 6.944 1.43875 94.94 0.53433
*35 -331.0393 0.120
36 228.6296 2.000 1.84666 23.83 0.61603
37 94.7631 10.813 1.49700 81.54 0.53748
38 -165.3395 0.120
39 -1201.8508 2.764 1.49700 81.54 0.53748
40 -273.2436 DD[40]
41(St) 7.313
42 -83.9414 1.800 1.63680 49.55 0.56054
43 29.5476 6.956 1.80518 25.43 0.61027
44 926.3016 3.232
45 -49.7982 1.800 1.80400 46.57 0.55724
46 67.6226 3.665 1.80518 25.43 0.61027
47 -1341.9464 3.573
48 -65.6708 3.002 1.61057 60.75 0.54217
49 -39.9449 20.000
50 -224.5155 1.800 1.90674 33.11 0.58884
51 50.2562 8.425 1.57427 62.14 0.54153
52 -58.8802 2.331
53 38.1425 1.800 1.80518 25.42 0.61616
54 30.8471 9.077 1.48749 70.24 0.53007
55 -125.7866 0.120
56 56.6157 1.800 1.91082 35.25 0.58224
57 23.2290 7.636 1.61800 63.33 0.54414
58 2133.6808 5.000
59 33.000 1.60859 46.44 0.56664
60 13.200 1.51633 64.05 0.53463
61 8.782
[ Table 5]
Example 2
WIDE middle TELE
Zr 1.00 5.43 29.50
f 6.00 32.60 177.07
FNo. 1.55 1.55 2.28
2ω(°) 89.2 18.6 3.4
DD[23] 2.32 74.23 100.50
DD[31] 186.16 84.34 1.47
DD[40] 1.93 31.83 88.44
[ Table 6]
Example 2
Noodle numbering 24 35
KA 8.53962266E+00 -7.04245401E+01
A4 1.00235261E-06 1.96764291E-07
A6 -9.50614096E-10 2.43186296E-11
A8 5.61915198E-12 -8.96226930E-15
A10 -2.44461982E-14 3.39192167E-16
A12 6.67716048E-17 -1.18751060E-18
A14 -1.10237641E-19 1.93540717E-21
A16 1.00714236E-22 -1.70625935E-24
A18 -3.90478300E-26 7.86273571E-28
A20 0.00000000E+00 -1.48721886E-31
[ example 3]
Fig. 4 is a sectional view of the zoom lens system according to embodiment 3. The zoom lens of embodiment 3 has the same configuration as the outline of the zoom lens of embodiment 1. Table 7 shows basic lens data of the zoom lens of example 3, table 8 shows specifications and variable surface distances, and fig. 9 shows aberrations in a state of focusing on an infinite object.
[ Table 7]
Example 3
Noodle numbering R D Nd νd θgF
1 237.0012 5.500 1.78800 47.37 0.55598
2 94.4504 42.582
3 -563.2072 3.8/00 1.77250 49.60 0.55212
4 553.7210 16.144
5 -242.1666 3.800 1.72916 54.68 0.54451
6 -6191.3956 1.000
7 340.6060 9.119 1.84139 24.56 0.61274
8 4939.2691 3.620
9 -5547.0812 4.600 1.84139 24.56 0.61274
10 430.3341 0.521
11 418.7206 23.320 1.43387 95.18 0.53733
12 -189.8379 0.120
13 -403.3943 6.499 1.43875 94.66 0.53402
14 -230.9294 27.885
15 282.0764 19.043 1.43387 95.18 0.53733
16 -506.7463 0.120
17 226.9477 4.600 1.85025 30.05 0.59797
18 165.7711 7.886
19 266.1605 28.980 1.43387 95.18 0.53733
20 -209.3887 0.120
21 234.3058 11.839 1.49700 81.54 0.53748
22 1331.0455 0.120
23 141.9424 9.916 1.49700 81.54 0.53748
24 245.8248 DD[24]
25 163.3095 2.000 1.83084 44.92 0.55781
26 63.8087 2.797
27 159.8014 1.700 1.83292 44.71 0.55821
28 66.7838 8.586
29 -57.8512 1.680 1.81444 46.56 0.55481
30 110.0253 12.554 1.80518 25.43 0.61027
31 -42.5267 1.700 1.80400 46.57 0.55724
32 -329.2057 DD[32]
33 2067.9569 4.942 1.43875 94.94 0.53433
34 -167.7754 0.120
35 245.2386 6.656 1.43875 94.94 0.53433
36 -177.1901 0.120
37 132.0130 2.000 1.84139 24.56 0.61274
38 74.7835 9.795 1.49700 81.54 0.53748
39 -730.5527 0.120
40 162.3696 4.638 1.49700 81.54 0.53748
41 -3105.2838 DD[41]
42(St) 7.698
43 -67.0768 1.710 1.51600 53.03 0.55412
44 30.0378 6.465 1.80518 25.43 0.61027
45 287.1442 3.624
46 -63.2556 1.710 1.80400 46.57 0.55724
47 59.1174 3.043 1.80518 25.43 0.61027
48 137.5323 8.939
49 -57.5176 3.037 1.75877 48.78 0.55430
50 -39.6535 15.663
51 -175.8260 1.800 1.90977 35.13 0.58212
52 51.2747 8.074 1.68006 56.53 0.54456
53 -69.9684 4.848
54 39.7555 1.860 1.80518 25.42 0.61616
55 30.5464 9.281 1.48749 70.24 0.53007
56 -146.0466 0.120
57 50.1812 2.200 1.91082 35.25 0.58224
58 24.8743 8.925 1.61800 63.33 0.54414
59 290.0049 5.000
60 33.000 1.60859 46.44 0.56664
61 13.200 1.51633 64.05 0.53463
62 9.052
[ Table 8]
Example 3
WIDE middle TELE
Zr 1.00 5.39 29.00
f 6.21 33.45 180.14
FNo. 1.55 1.55 2.28
2ω(°) 87.2 18.0 3.4
DD[24] 2.22 85.68 116.90
DD[32] 211.88 95.76 1.45
DD[41] 2.80 35.46 98.54
[ example 4]
Fig. 5 is a sectional view of the zoom lens system according to embodiment 4. The zoom lens of embodiment 4 has the same configuration as the outline of the zoom lens of embodiment 1. Table 9 shows basic lens data of the zoom lens of example 4, table 10 shows specifications and variable surface distances, and fig. 10 shows respective aberrations in a state of focusing on an infinite object.
[ Table 9]
Example 4
Noodle numbering R D Nd νd θgF
1 305.9182 5.500 1.77250 49.60 0.55212
2 102.7263 40.872
3 -716.7701 3.800 1.63604 58.52 0.54440
4 868.9566 12.551
5 -321.0268 3.800 1.72920 54.78 0.54332
6 1091.8474 1.000
7 254.1628 8.935 1.84139 24.56 0.61274
8 647.6638 6.060
9 4518.8065 4.600 1.74914 31.12 0.59656
10 297.1280 0.200
11 275.6141 27.168 1.43387 95.18 0.53733
12 -205.5715 0.120
13 -389.0746 4.928 1.43875 94.66 0.53402
14 -269.9616 34.579
15 381.1369 17.095 1.43387 95.18 0.53733
16 -376.3377 0.120
17 187.4114 4.600 1.85000 22.50 0.62144
18 146.7945 3.591
19 175.9384 27.677 1.43387 95.18 0.53733
20 -321.9224 0.120
21 235.8609 12.831 1.49700 81.54 0.53748
22 19478.2599 0.120
23 134.5449 10.099 1.49700 81.54 0.53748
24 247.4976 DD[24]
25 170.8403 2.000 1.83572 44.43 0.55876
26 48.4798 4.171
27 270.6754 1.700 1.80848 47.15 0.55378
28 82.0022 7.227
29 -51.0447 1.680 1.83400 44.60 0.55842
30 63.0688 12.616 1.80518 25.43 0.61027
31 -47.0849 1.700 1.80400 46.57 0.55724
32 -195.5272 DD[32]
33 -554058426.5621 4.689 1.43875 94.94 0.53433
34 -167.7754 0.120
*35 324.7133 5.982 1.43875 94.94 0.53433
36 -189.8567 0.120
37 176.7467 2.000 1.78032 25.98 0.60963
38 77.1030 10.701 1.49700 81.54 0.53748
39 -227.8770 0.120
*40 125.3226 6.672 1.49700 81.54 0.53748
41 -412.8149 DD[41]
42(St) 7.337
43 -70.8061 1.710 1.51600 52.00 0.55557
44 30.0118 5.229 1.80518 25.46 0.61572
45 93.6316 3.197
46 -77.7409 1.710 1.80400 46.57 0.55724
47 67.1485 5.970 1.80518 25.46 0.61572
48 -8534.6327 8.919
49 -98.5345 3.139 1.80001 27.49 0.60623
50 -76.9202 21.036
51 -537.2825 1.800 1.91082 35.25 0.58224
52 42.2860 8.767 1.60403 61.00 0.54212
53 -77.6929 0.120
54 44.2653 2.200 1.80518 25.42 0.61616
55 36.5589 9.259 1.48749 70.24 0.53007
56 -88.6175 0.120
57 51.6549 2.200 1.91082 35.25 0.58224
58 26.0739 11.781 1.61800 63.33 0.54414
59 290.0049 5.000
60 33.000 1.60859 46.44 0.56664
61 13.200 1.51633 64.05 0.53463
62 8.174
[ Table 10]
Example 4
WIDE middle TELE
Zr 1.00 5.39 29.00
f 6.22 33.52 180.51
FNo. 1.55 1.55 2.28
2ω(°) 87.2 18.0 3.4
DD[24] 1.90 73.95 100.59
DD[32] 184.82 83.59 1.36
DD[41] 1.64 30.83 86.41
[ example 5]
Fig. 6 is a sectional view of the zoom lens system according to embodiment 5. The zoom lens of embodiment 5 has the same configuration as the outline of the zoom lens of embodiment 1. Table 11 shows basic lens data of the zoom lens of example 5, table 12 shows specifications and variable surface intervals, table 13 shows aspherical coefficients, and fig. 11 shows aberrations in a state of focusing on an object at infinity.
[ Table 11]
Example 5
Noodle numbering R D Nd νd θgF
1 257.1538 4.300 1.78800 47.49 0.55552
2 105.2874 41.572
3 -579.9275 3.800 1.77250 49.62 0.55186
4 914.1372 13.801
5 -305.2682 3.800 1.80420 46.50 0.55723
6 677.9015 0.500
7 338.2627 13.041 1.84666 23.83 0.61603
8 -1302.3219 2.701
9 -1280.6320 4.000 1.80610 33.27 0.58845
10 422.5031 0.200
11 382.9547 24.881 1.43387 95.18 0.53733
12 -198.7931 0.123
13 -940.7072 8.039 1.43875 94.66 0.53402
14 -295.8554 36.281
15 220.2026 20.269 1.43387 95.18 0.53733
16 -570.3536 0.155
17 191.8720 4.000 1.84666 23.83 0.61603
18 142.6334 6.048
19 197.1299 24.337 1.43387 95.18 0.53733
20 -333.7604 0.124
21 234.3802 11.971 1.49710 81.56 0.53848
22 4085.7055 0.126
23 149.0058 9.048 1.49710 81.56 0.53848
24 276.9516 DD[24]
*25 265.7888 2.000 1.77250 49.60 0.55212
26 64.7872 2.570
27 159.6699 1.700 1.84850 43.79 0.56197
28 63.0146 7.929
29 -59.7385 1.700 1.80400 46.53 0.55775
30 69.5133 12.779 1.80518 25.43 0.61027
31 -44.5768 1.680 1.83481 42.74 0.56490
32 -638.2080 DD[32]
33 373.2244 6.552 1.43875 94.66 0.53402
*34 -152.2535 0.120
35 264.7297 6.281 1.43875 94.66 0.53402
36 -208.5903 0.120
37 143.0793 2.000 1.84666 23.83 0.61603
38 80.1508 10.334 1.49700 81.54 0.53748
39 -346.9155 0.120
40 183.7205 5.091 1.43875 94.66 0.53402
41 -649.3081 DD[41]
42(St) 5.917
43 -65.9736 1.710 1.51742 52.43 0.55649
44 34.3555 5.944 1.84666 23.83 0.61603
45 215.2820 3.627
46 -88.5730 1.710 1.69680 55.53 0.54341
47 142.8796 1.811 1.69895 30.13 0.60298
48 85.5707 5.308
49 -56.7353 8.476 1.80610 33.27 0.58845
50 -47.2780 24.898
51 371.3313 1.650 1.91082 35.25 0.58224
52 38.0207 8.486 1.64000 60.08 0.53704
53 -129.2474 1.029
54 45.3452 1.650 1.75520 27.51 0.61033
55 49.4971 7.469 1.48749 70.24 0.53007
56 -99.1462 0.120
57 60.3035 1.700 1.91082 35.25 0.58224
58 25.0149 12.998 1.59282 68.62 0.54414
59 931.0918 5.000
60 33.000 1.60859 46.44 0.56664
61 13.200 1.51633 64.05 0.53463
62 9.025
[ Table 12]
Example 5
WIDE middle TELE
Zr 1.00 5.55 30.82
f 6.50 36.06 200.21
FNo. 1.55 1.55 2.52
2ω(°) 84.4 16.8 3.0
DD[24] 2.25 77.76 105.19
DD[32] 195.55 89.13 1.98
DD[41] 2.28 33.20 92.92
[ Table 13]
Example 5
Noodle numbering 25 34
KA 1.00000000E+00 1.00000000E+00
A4 1.00676564E-07 1.13013542E-07
A6 -4.26151243E-07 -2.28799182E-10
A8 2.54163222E-12 9.65099348E-13
A10 -8.75259965E-15 -2.37194270E-15
A12 1.64967886E-17 3.54185416E-18
A14 -1.58739346E-20 -3.14003801E-21
A16 6.15758908E-24 1.51566663E-24
A18 -1.28183518E-28 -3.06225660E-28
A20 0.00000000E+00 0.00000000E+00
Table 14 shows the correspondence values of conditional expressions (1) to (6) of the zoom lenses of embodiments 1 to 5. Examples 1 to 5 use the d-line as the reference wavelength. The values under the d-line reference are shown in table 14.
[ Table 14]
Formula number Example 1 Example 2 Example 3 Example 4 Example 5
(1) f1A/f1 -1.435 -1.224 -1.100 -1.337 -1.335
(2) νdAna-ν1Ap 21.77 21.77 25.99 29.74 24.04
(3) θgF1Ap-θgF1Ana 0.056 0.056 0.062 0.066 0.061
(4) Z3/f3 1.116 1.159 1.182 1.161 1.202
(5) f1Cp/f1C 2.214 2.145 2.068 2.174 2.246
(6) f2/f3 -0.410 -0.396 -0.440 -0.412 -0.415
As is apparent from the above data, the zoom lenses according to embodiments 1 to 5 have a zoom ratio of 25 or more and a high zoom ratio, and have a wide angle of view configuration with a full angle of view of 80 degrees or more at the wide angle end, and are compact, and have high optical performance with good correction of various aberrations including chromatic aberration.
Next, an imaging device according to an embodiment of the present invention will be described. Fig. 12 is a schematic configuration diagram of an imaging device 10 using a zoom lens 1 according to an embodiment of the present invention, as an example of the imaging device according to the embodiment of the present invention. Examples of the imaging device 10 include a broadcasting camera, a movie camera, a digital camera, a video camera, and a monitoring camera.
The imaging device 10 includes: a zoom lens 1; an optical filter 7 disposed on the image side of the zoom lens 1; an imaging element 8 disposed on the image side of the filter 7; a signal processing unit 4 for performing arithmetic processing on an output signal from the imaging element 8; a magnification-varying control unit 5 for performing magnification variation of the zoom lens 1; and a focus control unit 6 for focusing the zoom lens 1. Fig. 12 schematically illustrates the 1 St lens group G1, the 2 nd lens group G2, the 3 rd lens group G3, the aperture stop St, and the 4 th lens group G4 of the zoom lens 1.
The imaging element 8 is an element that converts an optical image formed by the zoom lens 1 into an electrical signal, and for example, a CCD (Charge Coupled De v ice), a CMOS (complementary Metal Oxide Semiconductor), or the like can be used. The imaging element 8 is configured such that an imaging surface thereof is aligned with an image surface of the zoom lens 1. In fig. 12, only 1 imaging element 8 is illustrated, but the imaging apparatus of the present invention is not limited to this, and may be a so-called 3-plate imaging apparatus having 3 imaging elements.
The present invention has been described above by referring to the embodiments and examples, but the present invention is not limited to the above embodiments and examples, and various modifications are possible. For example, the curvature radius, surface interval, refractive index, dispersion coefficient, aspherical surface coefficient, and the like of each lens are not limited to the values shown in the numerical examples, and other values may be used.
Description of the symbols
1-zoom lens, 4-signal processing section, 5-zoom control section, 6-focus control section, 7-filter, 8-imaging element, 10-image pickup device, G1-1 St lens group, G1A-1A sub-lens group, G1B-1B sub-lens group, G1C-1C sub-lens group, G2-2 nd lens group, G3-3 rd lens group, G4-4 th lens group, L1A-L1L, L2 a-L2 e, L3 a-L3 e, L4 a-L4 k-lens, beam on ma, ta, wa-axis, beam of mb, tb, wb-maximum angle of view, PP-optical component, Sim-image plane, St-aperture stop, Z-optical axis.

Claims (10)

1. A zoom lens, characterized in that,
only 4 lens groups including a 1 st lens group having positive refractive power, a 2 nd lens group having negative refractive power, a 3 rd lens group having positive refractive power, and a 4 th lens group having positive refractive power are provided as lens groups in order from the object side to the image side,
a stop is disposed between the image plane and the surface closest to the image plane of the 3 rd lens group,
in zooming, the 1 st lens group and the 4 th lens group are fixed with respect to an image surface, the 2 nd lens group and the 3 rd lens group move with changing an interval in an optical axis direction,
the 1 st lens group includes, in order from the object side toward the image side, a 1A sub-lens group having negative refractive power and fixed to an image surface at the time of focusing, a 1B sub-lens group having positive refractive power and moving in an optical axis direction at the time of focusing, and a 1C sub-lens group having positive refractive power and fixed to an image surface at the time of focusing,
the zoom lens satisfying the following conditional expression (1) with the focal length of the 1 st sub-lens group set to f1A and the focal length of the 1 st lens group upon focusing on an infinite object set to f1,
-1.47<f1A/f1<-1.08 (1),
in the case where the d-line reference Abbe number of positive lenses in the 1A sub-lens group is set to v 1Ap, the average value of the d-line reference Abbe numbers of all negative lenses in the 1A sub-lens group is set to v1Ana, the partial dispersion ratio between the g-line and the F-line of the positive lenses in the 1A sub-lens group is set to θ gF1Ap, and the average value of the partial dispersion ratio between the g-line and the F-line of all negative lenses in the 1A sub-lens group is set to θ gF1Ana, the 1A sub-lens group has at least 1 positive lens satisfying the following conditional expressions (2) and (3),
19<v 1Ana-v 1Ap<31 (2);
0.046<θgF1Ap-θgF1Ana<0.071 (3)。
2. the zoom lens according to claim 1,
the zoom lens satisfying the following conditional expression (4) with a distance difference in an optical axis direction between a position of the 3 rd lens group at a wide angle end and a position of the 3 rd lens group at a telephoto end being set to Z3 and a focal length of the 3 rd lens group being set to f3,
1<Z3/f3<1.4 (4)。
3. the zoom lens according to claim 1 or 2,
in the case where a focal length of a positive lens having a shortest focal length among positive lenses in the 1C sub-lens group is set to f1Cp, and a focal length of the 1C sub-lens group is set to f1C, the zoom lens satisfies the following conditional expression (5),
1.9<f1Cp/f1C<2.25 (5)。
4. the zoom lens according to claim 1 or 2,
the zoom lens satisfying the following conditional expression (6) with the focal length of the 2 nd lens group set to f2 and the focal length of the 3 rd lens group set to f3,
-0.58<f2/f3<-0.38 (6)。
5. the zoom lens according to claim 1 or 2,
the 2 nd lens group and the 3 rd lens group simultaneously pass through points at which respective imaging magnifications are-1 times, upon varying magnification from a wide-angle end to a telephoto end.
6. The zoom lens according to claim 1,
at least 1 of the positive lenses satisfying the conditional expressions (2) and (3) satisfies the following conditional expression (2-1),
21<v 1Ana-v 1Ap<30 (2-1)。
7. the zoom lens according to claim 1,
at least 1 of the positive lenses satisfying the conditional expressions (2) and (3) satisfies the following conditional expression (3-1),
0.051<θgF1Ap-θgF1Ana<0.068 (3-1)。
8. the zoom lens according to claim 2,
the zoom lens satisfies the following conditional expression (4-1),
1.05<Z3/f3<1.22 (4-1)。
9. the zoom lens according to claim 4,
the zoom lens satisfies the following conditional expression (6-1),
-0.5<f2/f3<-0.38 (6-1)。
10. an image pickup apparatus is characterized in that,
a zoom lens according to any one of claims 1 to 9.
CN201890001294.1U 2017-10-23 2018-10-09 Zoom lens and image pickup apparatus Active CN211928290U (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2017204591A JP2019078849A (en) 2017-10-23 2017-10-23 Zoom lens and image capturing device
JP2017-204591 2017-10-23
PCT/JP2018/037630 WO2019082641A1 (en) 2017-10-23 2018-10-09 Zoom lens and imaging device

Publications (1)

Publication Number Publication Date
CN211928290U true CN211928290U (en) 2020-11-13

Family

ID=66247801

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201890001294.1U Active CN211928290U (en) 2017-10-23 2018-10-09 Zoom lens and image pickup apparatus

Country Status (3)

Country Link
JP (1) JP2019078849A (en)
CN (1) CN211928290U (en)
WO (1) WO2019082641A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3486560B2 (en) * 1998-10-14 2004-01-13 キヤノン株式会社 Zoom lens
JP4463909B2 (en) * 1999-10-19 2010-05-19 キヤノン株式会社 Zoom lens
JP4469625B2 (en) * 2004-02-12 2010-05-26 フジノン株式会社 Zoom lens
JP5031475B2 (en) * 2007-07-31 2012-09-19 キヤノン株式会社 Zoom lens and photographing system having the same
JP5393259B2 (en) * 2009-05-27 2014-01-22 キヤノン株式会社 Zoom lens and imaging apparatus having the same
JP5901401B2 (en) * 2012-04-13 2016-04-06 キヤノン株式会社 Zoom lens and imaging apparatus having the same
JP2014016510A (en) * 2012-07-10 2014-01-30 Canon Inc Zoom lens and imaging device having the same
JP2016109952A (en) * 2014-12-09 2016-06-20 キヤノン株式会社 Zoom lens and image capturing device having the same
JP6711666B2 (en) * 2016-03-30 2020-06-17 キヤノン株式会社 Zoom lens and imaging device having the same

Also Published As

Publication number Publication date
WO2019082641A1 (en) 2019-05-02
JP2019078849A (en) 2019-05-23

Similar Documents

Publication Publication Date Title
US9759899B2 (en) Zoom lens and imaging apparatus
CN108700729B (en) Zoom lens and imaging device
US9874731B2 (en) Zoom lens and imaging apparatus
CN108398773B (en) Zoom lens and image pickup apparatus having the same
CN105388597B (en) Zoom lens and imaging device
US20200110251A1 (en) Zoom lens and image pickup apparatus including the same
CN106842526B (en) Zoom lens and imaging device
JP2016173481A (en) Zoom lens and imaging apparatus
WO2013031180A1 (en) Zoom lens and imaging device
US9746667B2 (en) Zoom lens and imaging apparatus
US20160259155A1 (en) Zoom lens and imaging apparatus
CN107544129B (en) Zoom lens and imaging device
CN108885333B (en) Zoom lens and imaging device
US9069158B2 (en) Variable magnification optical system and imaging apparatus
JP6493896B2 (en) Zoom lens and imaging device
JP6411678B2 (en) Zoom lens and imaging device
CN108363195B (en) Zoom lens and image pickup apparatus
CN110850565A (en) Zoom lens and imaging device
CN108780213B (en) Zoom lens and imaging device
JP2019040020A (en) Zoom lens and imaging device
CN211928290U (en) Zoom lens and image pickup apparatus
CN108279489B (en) Zoom lens and image pickup apparatus
CN210742600U (en) Zoom lens and image pickup apparatus
US10698187B2 (en) Extender lens and imaging apparatus
CN108279490B (en) Zoom lens and image pickup apparatus

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant