KR20150058949A - Zoom lens and photographing apparatus having the same - Google Patents

Abstract

Disclosed are a zoom lens and a photographing apparatus including the same. The disclosed zoom lens comprises a first lens group sequentially arranged from a material side, and having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power, and three piece contacting lens having a first lens, a second lens, and a third lens; and a fourth lens group having a positive refractive power. When zooming from a wide angle end to a telephoto end, distance of each lens group is changed.

Description

[0001] The present invention relates to a zoom lens and a photographing apparatus including the zoom lens.

Embodiments of the present invention relate to a small zoom lens having a high zoom magnification and a photographing apparatus including the zoom lens.

BACKGROUND ART In a photographing apparatus using a solid-state image pickup device such as a digital camera, an interchangeable lens system, or a video camera, users have a demand for high resolution, high magnification and the like. In addition, the consumer's expertise with respect to a photographing apparatus is increasing, and a zoom lens in a digital camera or a digital camcorder connected to an image pickup apparatus such as a CCD or a CMOS is required to have a compact and high magnification optical system. However, miniaturization is difficult to construct a high-performance, high-magnification optical system.

Embodiments of the present invention provide a zoom lens with a high magnification and a small size.

Embodiments of the present invention provide a photographing apparatus including a zoom lens having a high magnification and a small size.

A zoom lens according to an embodiment of the present invention is arranged in order from an object side,

A first lens group having a positive refractive power; A second lens group having negative refractive power; A third lens group having a positive refracting power and including a three-piece cemented lens having a first lens, a second lens and a third lens; And a fourth lens unit having a positive refractive power,

The distance of each lens group changes when zooming from the wide-angle end to the telephoto end,

The following equation is satisfied.

<Expression>

Here, vd1 is the Abbe number of the first lens of the third lens group, vd2 is the Abbe number of the second lens of the third lens group of the third lens group, and Vd3 is the three- G2 represents the distance between the object-side vertex and the object vertex on the optical axis in the second lens group, and fw represents the total focal length of the wide-angle end.

The first lens, the second lens, and the third lens of the three-point cemented lens of the third lens group may be meniscus lenses convex on the object side.

The first lens group may include a cemented lens.

The second lens group may include, in order from the object side, an aspherical lens, a biconcave lens, and a convex meniscus lens toward the object side.

The third lens group includes five lenses, and the five lenses may be convex meniscus lenses toward the object side.

The fourth lens group may include a convex meniscus lens on the object side.

The meniscus lens of the fourth lens group may be an aspherical lens.

The meniscus lens of the fourth lens group may be a plastic lens.

The zoom lens may have a zoom magnification in a range of 9 to 12 inclusive.

The zoom lens may have an F number in the range of 1.6 to 2.0.

The zoom lens can satisfy the following expression.

<Expression>

G2 is a distance between the object side apex and the image side vertex on the optical axis in the second lens group, G3 is a distance between the object side apex and the image side vertex on the optical axis in the third lens group, Represents the focal distance.

The fourth lens group may perform focusing.

The distance between the first lens group and the second lens group increases in zooming, the distance between the third lens groups decreases in the second lens group, and the distance between the third lens group and the fourth lens group increases have.

An imaging apparatus according to an exemplary embodiment of the present invention includes a zoom lens and an imaging element that receives an image formed by the zoom lens,

Arranged in this order from the object side,

A first lens group having a positive refractive power; A second lens group having negative refractive power; A third lens group having a positive refracting power and including a three-piece cemented lens having a first lens, a second lens and a third lens; And a fourth lens unit having a positive refractive power,

The distance of each lens group changes when zooming from the wide-angle end to the telephoto end,

The following equation is satisfied.

<Expression>

Here, vd1 is the Abbe number of the first lens of the three-piece cemented lens of the third lens group, and vd2 is the Abbe number of the second lens of the three-piece cemented lens of the third lens group. Vd3 denotes the Abbe number of the third lens of the third lens group of the third lens group, G2 denotes the distance between the object side apex and the upper side apex on the optical axis in the second lens group, and fw denotes the total focal length of the wide- .

The zoom lens according to the embodiment of the present invention is small and has a high zoom magnification. In addition, the zoom lens can realize a bright lens system having a low F number.

FIG. 1 is a view showing a zoom lens according to a first embodiment of the present invention in a wide-angle end, a middle end, and a telephoto end.
2A and 2B are aberration diagrams at the wide angle end and the telephoto end of the zoom lens according to the first embodiment of the present invention.
3 is a view showing a zoom lens according to a second embodiment of the present invention in a wide angle end, a middle end, and a telephoto end.
FIGS. 4A and 4B show aberration diagrams at the wide-angle end and the telephoto end of the zoom lens according to the second embodiment of the present invention.
5 is a view illustrating a zoom lens according to a third embodiment of the present invention, in which the zoom lens is divided into a wide-angle end, a middle end, and a telephoto end.
6A and 6B show aberration diagrams at the wide angle end and the telephoto end of the zoom lens according to the third embodiment of the present invention.
7 illustrates a photographing apparatus according to an embodiment of the present invention.

A zoom lens according to an embodiment of the present invention and a photographing apparatus including the zoom lens will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a zoom lens 100 according to an embodiment of the present invention. The zoom lens 100 is arranged in order from the object side O to the image side I and includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, The third lens group G3 may include a fourth lens group G4 having positive refractive power.

When the zoom lens 100 zooms from a wide angle end to a telephoto end, each lens group can be moved. For example, when the zoom lens 100 zooms, the interval between the first lens group G1 and the second lens group G2 increases, and the distance between the second lens group G2 and the third lens group G3 , And the interval between the third lens group G3 and the fourth lens group G4 can be increased.

The first lens group G1 may include, for example, a first lens 1 and a second lens 2. The first lens 1 may have a convex meniscus shape on the object side O, for example. The second lens 2 may have a convex surface on the object side (0). The first lens 1 and the second lens 2 can be joined. The first lens 1 may have a negative refractive power, for example, and the second lens 2 may have a positive refractive power. For example, the first lens 1 may have a refractive index of 1.9 or more and 2.2 or less and an Abbe number of 15 or more and 20 or less. The second lens 2 may have a refractive index of, for example, 1.8 or more and 2.0 or less and an Abbe number of 35 or more and 45 or less.

The first lens 1 and the second lens 2 may be formed of a high refractive index material so as to correct chromatic aberration occurring at the time of zooming and reduce the overall length of the zoom lens at the telephoto end.

The second lens group G2 may include a third lens 3, a fourth lens 4, and a fifth lens 5. For example, the third lens 3 may have a negative refractive power, the fourth lens 4 may have a negative refractive power, and the fifth lens 5 may have a positive refractive power. The third lens 3 may be a meniscus lens convex to the object side O. [ The third lens 3 may be an aspherical lens.

The fourth lens 4 may be a double concave lens. The fifth lens 5 may be a convex meniscus lens on the object side (O). The astigmatism can be easily corrected by the second lens group G2.

The third lens 5 and the fifth lens 5 may be formed of a high-refraction material and may have a relatively high refractive power as compared with other lenses. It is possible to reduce the amount of movement of the second lens group G2 and obtain a high zoom magnification when zooming from the wide angle end to the telephoto end by the third lens 5 and the fifth lens 5. The radius of curvature of the object side surface of the third lens 3 and the radius of curvature of the image side surface of the fifth lens 5 may be set to 50 or more,

On the other hand, the second lens group G2 may consist of one aspheric lens and two spherical lenses to reduce the occurrence of astigmatism.

The third lens group G3 may include a three-piece cemented lens.

For example, the third lens group G3 includes a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, and a tenth lens 10 . The sixth lens 6 may be a convex lens. The sixth lens 6 may be an aspherical lens. The seventh, eighth, and ninth lenses 7, 8, and 9 may be meniscus lenses convex on the object side O, respectively. The seventh, eighth, and ninth lenses 7, 8, and 9 may be joined. The seventh to ninth lenses 7, 8, and 9 are meniscus lenses convex in the same direction, and they are jointed to reduce the size. The tenth lens 10 may be a convex meniscus lens on the object side (O).

The third lens group G3 can easily correct spherical aberration and longitudinal chromatic aberration generated in the large-diameter optical system of Fno 2.0 or less at the wide-angle end and Fno 4.0 or less at the telephoto end. In addition, the three-point cemented lens has positive, negative, and positive refractive powers, thereby reducing the chromatic aberration of magnification occurring at the time of zooming. For example, the seventh lens 9 and the ninth lens 9 have a refractive index of 1.5 or less and an Abbe number of 70 or less, the eighth lens 8 has a refractive index of 1.9 or more, Can have a number.

The third lens group G3 may include, for example, a diaphragm ST. The diaphragm ST may be disposed between the sixth lens 6 and the seventh lens 7 of the third lens group. Also, the size of the diaphragm at the time of zooming can be configured not to change. Thereby, it is possible to realize Fno approximately 3.5 at the telephoto end and Fno approximately 1.8 at the wide angle end.

The fourth lens group G4 may include an eleventh lens 11. The eleventh lens 11 may be, for example, a plastic lens having a refractive index of 1.55 or less. The eleventh lens 11 may be an aspherical lens. The fourth lens group G4 may perform focusing. The fourth lens group G4 makes it possible to reduce the change of the surface curvature aberration with the change of the object distance while the angle of incidence of the light beam is not increased. The eleventh lens 11 may be a convex meniscus lens on the object side (O). The distortion aberration at the astigmatism and the telephoto end can be easily corrected by the fourth lens group G4. Further, the eleventh lens 11 can be formed of a plastic lens, thereby reducing the manufacturing cost.

Meanwhile, the zoom lens 100 according to the embodiment of the present invention can satisfy the following expression.

<식 1>

<Formula 1>

<식 2>

<Formula 2>

Here, vd1 is the Abbe number of the first lens of the third lens group, vd2 is the Abbe number of the second lens of the third lens group of the third lens group, and Vd3 is the three- G2 represents the distance between the object-side vertex and the object vertex on the optical axis in the second lens group, and fw represents the total focal length of the wide-angle end.

Equation 1 shows the ratio of the Abbe number of the seventh lens 9 to the Abbe number of the eighth lens 8 of the three-point cemented lens of the third lens group. ((vd1 + vd3) / vd2) exceeds the upper limit value of Equation (1), the chromatic aberration occurring at the time of zooming can be corrected easily, but the lens material cost may increase. ((vd1 + vd3) / vd2) exceeds the upper limit value of Equation (1), it may become difficult to correct the chromatic aberration occurring at the time of zooming and reduce the total length of the optical system.

Equation 2 defines the ratio of the distance between the object-side vertex and the image vertex on the optical axis of the second lens unit and the total focal length of the wide-angle end. (G2 / Fw) exceeds the upper limit value of the equation (2), the entire thickness of the second lens unit increases and it becomes difficult to downsize. When (G2 / Fw) exceeds the lower limit value, It can be difficult.

The zoom lens 100 may satisfy the following expression.

<식 3>

<Formula 3>

G2 is a distance between the object side apex and the image side vertex on the optical axis in the second lens group, G3 is a distance between the object side apex and the image side vertex on the optical axis in the third lens group, Represents the focal distance.

If ((G2 + G3) / fw} exceeds the upper limit value of the formula (3), the thickness of the second lens group and the third lens group increases, , Aberration correction may become difficult.

The zoom lens 100 according to the embodiment of the present invention may have a small zoom magnification as described above and a zoom magnification in the range of 9 to 12, for example.

In addition, the zoom lens 100 may have an F number in the range of 1.6 to 2.0.

The definition of an aspherical surface used in a zoom lens according to an embodiment of the present invention is as follows.

The aspheric surface shape can be expressed by the following equation with the optical axis direction as x axis and the direction perpendicular to the optical axis direction as the y axis, assuming that the traveling direction of the ray is positive. Where x is the distance from the vertex of the lens to the optical axis direction, y is the distance in a direction perpendicular to the optical axis, K is a conic constant, A, B, C, and D are aspheric coefficients, and c represents the inverse number (1 / R) of the radius of curvature at the apex of the lens.

<식 4>

<Formula 4>

Hereinafter, the design data of the zoom lens according to the embodiment of the present invention will be described. Hereinafter, f denotes a total focal length in mm units, Fno denotes an F number, 2ω denotes a unit of degree in terms of angle of view, R denotes a radius of curvature, Dn denotes a distance between lenses, Nd represents the refractive index, Vd represents the Abbe number, ST represents the aperture, OBJ represents the object surface, and ASP represents the aspherical surface. At least one filter (12) (13) may be provided on the uppermost side (I) in each embodiment.

&Lt; Embodiment 1 >

1 shows the wide angle end, the middle end, and the telephoto end of the zoom lens according to the first embodiment, respectively, and the following is the design data of the first embodiment. In the following table, the signs of the lens surfaces S1, S2, .., and Sn are denoted in order from the first surface of the object-side lens, and only the lens surface marks are shown in the drawings.

f; 4.54 ~ 14.30 ~ 43.13 Fno; 1.87 to 2.62 to 3.53 2?; 82.74 to 31.247 to 10.58

Lens face R Dn Nd Vd OBJ: INFINITY INFINITY S1 29.52600 0.500000 2.002700 19.317 S2 19.00091 3.290349 1.883000 40.8054 S3 227.59889 D1 S4 394.71229 0.400000 1.883000 40.8054 ASP:
K: 1.000000
A: 0.666482E-04 B: 0.154134E-06 C: - 265297E-07 D: 0.223071E-09 S5 7.43183 3.128578 ASP:
K: -0.647113
A: 0.294684E-03 B: 0.423645E-05 C: 0.701047E-07 D: - 147149E-08 S6 -19.47934 0.400000 1.613519 62.2454 S7 35.84535 0.100000 S8 15.74378 1.410300 2.091900 17.246 S9 45.44505 D2 S10 6.78700 2.165232 1.789088 45.2428 ASP:
K: -0.003159
A: -. 154648E-03 B: - 261377E-05 C: - 346091E-07 D: - 672105E-09 S11 195.94684 0.536368 ASP:
K: 1.000000
A: 0.117207E-03 B: - 144151E-05 C: 0.211432E-07 D: 0.587360E-09 ST INFINITY 0.350000 S13 10.11450 1.319070 1.487489 70.4412 S14 66.29302 0.400000 1.912352 25.2898 S15 3.81116 1.343048 1.487489 70.4412 S16 6.26415 0.683431 S17 7.59924 1.211065 1.899554 30.2052 S18 25.55627 D3 S19 8.03258 1.262560 1.531200 56.5100 ASP:
K: -1.000000
A: - 107400E-02 B: - 435787E-04 C: 0.367842E-05 D: - 105852E-06 S20 12.73034 D4 ASP:
K: -1.000000
A: -. 138562E-02 B: - 378823E-04 C: 0.381239E-05 D: - 105995E-06 S21 INFINITY 0.300000 1.516798 64.1983 S22 INFINITY 0.300000 S23 INFINITY 0.500000 1.516798 64.1983 S24 INFINITY 0.500000 IMG: INFINITY

The following shows the variable distance during zooming in the first embodiment.

Variable distance Wide angle stage Middle stage Telescope D1 0.3839 9.3821 19.508 D2 22.0490 6.7396 0.3 D3 4.5562 6.6150 14.2393 D4 2.2511 5.9407 5.8312

FIGS. 2A and 2B respectively show longitudinal spherical aberration, astigmatic field curves, and distortion at the wide-angle end and the telephoto end of the zoom lens according to the first embodiment of the present invention. will be. Tangential field curvature (T) and sagittal field curvature (S) are shown for the curvature of field.

&Lt; Embodiment 2 >

FIG. 3 shows a zoom lens according to the second embodiment, and the following is a design data of the second embodiment.

f; 4.34 to 13.67 to 41.21 Fno; 1.83 to 2.60 to 3.73 2?; 85.25 to 32.60 to 11.08

R Dn Nd Vd OBJ INFINITY INFINITY S1 27.11223 0.500000 1.968461 19.9271 S2 18.53500 3.355571 1.825491 44.8634 S3 335.88023 D1 S4 517.99619 0.400000 1.883000 40.8054 ASP:
K: 1.000000
A: 0.950741E-04 B: - 378777E-06 C: - 280846E-07 D: 0.276763E-09 S5 6.92737 3.174776 ASP:
K: -0.555317
A: 0.327875E-03 B: 0.538696E-05 C: 0.118690E-06 D: - 330120E-08 S6 -20.27851 0.400000 1.721814 54.0403 S7 40.39844 0.100000 S8 15.87234 1.413251 2.104200 17.0190 S9 50.77615 D2 S10 6.77867 2.108226 1.786092 44.6133 ASP:
K: -0.006547
A: -. 157569E-03 B: - 258410E-05 C: - 322807E-07 D: - 694451E-09 S11 159.42638 0.517303 ASP:
K: 1.000000
A: 0.114820E-03 B: - 138935E-05 C: 0.104291E-07 D: 0.969807E-09 ST INFINITY 0.350000 S13 10.29190 1.327244 1.496997 81.6084 S14 97.39956 0.400000 1.907706 26.8623 S15 3.88326 1.336124 1.496997 81.6084 S16 6.29177 0.604016 S17 7.78793 1.239652 1.892257 34.0658 S18 37.66864 D3 S19 7.89669 1.273838 1.531200 56.5100 ASP:
K: -1.000000
A: -. 119344E-02 B: - 466370E-04 C: 0.404743E-05 D: - 106245E-06 S20 12.18199 D4 ASP:
K: -1.000000
A: -. 157276E-02 B: - 376292E-04 C: 0.420116E-05 D: - 110265E-06 S21 INFINITY 0.300000 1.516798 64.1983 S22 INFINITY 0.300000 S23 INFINITY 0.500000 1.516798 64.1983 S24 INFINITY 0.500000 IMG INFINITY

The following shows the variable distance during zooming in the second embodiment.

Variable distance Wide angle stage Middle stage Telescope D1 0.35 8.7310 17.1810 D2 20.1055 6.2480 0.3 D3 4.5728 6.9813 15.9008 D4 2.2538 5.7783 6.5038

FIGS. 4A and 4B are schematic diagrams illustrating longitudinal spherical aberration, astigmatic field curves, and distortion at a wide angle end and a telephoto end of a zoom lens according to a second embodiment of the present invention, respectively. .

&Lt; Third Embodiment >

FIG. 5 shows a zoom lens according to the third embodiment, and the following is a design data of the third embodiment.

f; 4.52 to 16.73 to 51.55 Fno; 1.83 ~ 2.74 ~ 4.14 2?; 82.96 ~ 26.88 ~ 8.86

Lens face R Dn Nd Vd OBJ INFINITY INFINITY S1 27.46273 0.500000 1.945945 17.9843 S2 17.87939 3.796497 1.883000 40.8054 S3 254.50592 D1 S4 1000.00000 0.400000 1.883000 40.8054 ASP:
K: 1.000000
A: 0.111809E-03 B: 0.331302E-05 C: - 135567E-06 D: 0.114505E-08 S5 7.25946 3.030480 ASP:
K: -0.492014
A: 0.364212E-03 B: 0.115668E-04 C: 0.187741E-06 D: - 503159E-08 S6 -20.33740 0.400000 1.755000 52.3228 S7 30.87507 0.100000 S8 14.53154 1.409808 2.104200 17.019 S9 42.97813 D2 S10 6.79073 2.287296 1.834479 44.1375 ASP:
K: 0.003509
A: - 136697E-03 B: - 219646E-05 C: - 495867E-07 D: - 547447E-09 S11 1000.00000 0.500000 ASP:
K: 1.000000
A: 0.185959E-03 B: - 190875E-05 C: - 133287E-07 D: 0.165706E-08 ST INFINITY 0.350000 S13 9.95378 1.266627 1.496997 81.6084 S14 39.68797 0.400000 1.927178 21.3792 S15 3.51513 1.266830 1.496997 81.6084 S16 5.15152 0.240845 S17 5.66092 1.231107 1.887014 18.9829 S18 13.67232 4.043160 S19 8.20025 1.320512 1.531200 56.5100 ASP:
K: -1.000000
A: - 209454E-02 B: - 356984E-05 C: 0.437614E-05 D: - 940569E-07 S20 13.27303 2.160201 ASP:
K: -1.000000
A: - 265371E-02 B: 0.127075E-04 C: 0.463424E-05 D: - 102870E-06 S21 INFINITY 0.300000 1.516798 64.1983 S22 INFINITY 0.300000 S23 INFINITY 0.500000 1.516798 64.1983 S24 INFINITY 0.500000 IMG INFINITY

The following is a zooming variable distance in the third embodiment.

Variable distance Wide angle stage Middle stage Telescope D1 0.35 9.8415 16.5419 D2 20.0273 6.1680 0.3 D3 4.0432 6.3621 17.0206 D4 2.1602 6.0820 6.0170

FIGS. 6A and 6B are views showing longitudinal and lateral spherical aberrations, astigmatic field curves, and distortion at the telephoto end of the zoom lens according to the third embodiment of the present invention, respectively. .

The following shows that the first to third embodiments described above satisfy the above-mentioned expressions 1 to 3, respectively.

First Embodiment Second Embodiment Third Embodiment Equation (1) 5.571 6.076 7.634 Equation (2) 1.197 1.264 1.180 Equation (3) 2.962 3.081 2.848

FIG. 7 shows a photographing apparatus having a zoom lens 100 according to an embodiment of the present invention. The photographing apparatus includes the zoom lens 100 described above according to the embodiment and the imaging element 112 that receives the light image formed by the zoom lens 100. The photographing apparatus may include a recording means 113 recording information corresponding to the photoelectrically-converted object from the imaging element 112, and a finder 114 for observing a subject image. In addition, a display unit 115 for displaying a subject image may be provided. Here, an example in which the viewfinder 114 and the display unit 115 are separately provided is shown, but only the display unit can be provided without a viewfinder. The photographing apparatus shown in FIG. 7 is merely an example, and the present invention is not limited thereto, but can be applied to various optical apparatuses other than a camera. As described above, by applying the zoom lens of the present invention to a photographing apparatus such as a digital camera or a phone camera, it is possible to realize an optical apparatus that is small, bright, and capable of photographing at a high magnification.

The above-described embodiments are merely illustrative, and various modifications and equivalent other embodiments are possible without departing from the scope of the present invention. Therefore, the scope of the true technical protection according to the embodiment of the present invention should be determined by the technical idea of the invention described in the following claims.

G1 ... first lens group, G2 ... second lens group
G3 third lens group, D1, D2, D3, D4 ... variable distance

Claims (14)

Arranged in this order from the object side,
A first lens group having a positive refractive power;
A second lens group having negative refractive power;
A third lens group having a positive refracting power and including a three-piece cemented lens having a first lens, a second lens and a third lens; And
And a fourth lens group having positive refractive power,
The distance of each lens group changes when zooming from the wide-angle end to the telephoto end,
A zoom lens satisfying the following expression.
<Expression>

Here, vd1 is the Abbe number of the first lens of the third lens group, vd2 is the Abbe number of the second lens of the third lens group of the third lens group, and Vd3 is the three- G2 represents the distance between the object-side vertex and the object vertex on the optical axis in the second lens group, and fw represents the total focal length of the wide-angle end. The method according to claim 1,
And the first lens, the second lens, and the third lens of the three-piece cemented lens of the third lens group are each a convex meniscus lens toward the object side. The method according to claim 1,
Wherein the first lens group includes a cemented lens. The method according to claim 1,
And the second lens group includes, in order from the object side, an aspherical lens, a biconcave lens, and a meniscus lens convex on the object side. 5. The method according to any one of claims 1 to 4,
Wherein the third lens group includes five lenses, and the five lenses are convex meniscus lenses on the object side. 5. The method according to any one of claims 1 to 4,
And the fourth lens group includes a convex meniscus lens toward the object side. The method according to claim 6,
And the meniscus lens of the fourth lens group is an aspherical lens. The method according to claim 6,
And the meniscus lens of the fourth lens group is a plastic lens. 5. The method according to any one of claims 1 to 4,
Wherein the zoom lens has a zoom magnification in a range of 9 to 12 inclusive. 9. The method of claim 8,
Wherein the zoom lens has an F number in a range of 1.6 to 2.0. 5. The method according to any one of claims 1 to 4,
Wherein the zoom lens satisfies the following expression.
<Expression>

G2 is a distance between the object side apex and the image side vertex on the optical axis in the second lens group, G3 is a distance between the object side apex and the image side vertex on the optical axis in the third lens group, Represents the focal distance. 5. The method according to any one of claims 1 to 4,
And the fourth lens group performs focusing. 5. The method according to any one of claims 1 to 4,
Wherein the zoom lens has a zooming function in which the distance between the first lens unit and the second lens unit increases when zooming, the interval between the third lens unit decreases with the distance between the third lens unit and the fourth lens unit, lens. A zoom lens according to any one of claims 1 to 4, And
And an imaging element for receiving the image formed by the zoom lens.

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