ZOOM LENS AND IMAGING APPARATUS

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2014-117373, filed on Jun. 6, 2014, and Japanese Patent Application No. 2015-045035, filed on Mar. 6, 2015. Each of the above applications is hereby expressly incorporated by reference, in its entirety, into the present application.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a zoom lens for use with electronic cameras, such as digital cameras, video cameras, broadcasting cameras, monitoring cameras, etc., and an imaging apparatus provided with the zoom lens.

2. Description of the Related Art

As a zoom lens for television cameras, those having a five-group configuration as a whole for achieving high performance, where three lens groups are moved during magnification change, are proposed in Japanese Unexamined Patent Publication Nos. 7(1995)-248449 and 2009-128491 (hereinafter, Patent Documents 1 and 2, respectively).

Further, as a zoom lens having relatively high zoom magnification, those having a four-group configuration as a whole, where two lens groups are moved during magnification change, are proposed in Japanese Unexamined Patent Publication Nos. 2010-091788 and 2011-039399 (hereinafter, Patent Documents 3 and 4, respectively).

SUMMARY OF THE INVENTION

With high-magnification zoom lenses, in general, increase of amounts of movement of the lens elements for magnification change results in increased distance from the stop to the front lens element, and it is difficult to achieve wide angle of view without increasing the lens diameter and the weight of the lens.

Patent Documents 1 and 2 do not achieve sufficiently high zoom magnification. Patent Documents 3 and 4 do achieve high zoom magnification; however, they do not achieve sufficiently wide angle of view.

In view of the above-described circumstances, the present invention is directed to providing a zoom lens that is compact and has high optical performance, and achieves both high magnification and wide angle of view, as well as an imaging apparatus provided with the zoom lens.

An aspect of the zoom lens of the invention is a zoom lens consisting of, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a positive refractive power, and a fifth lens group having a positive refractive power,

wherein, during magnification change, the first lens group and the fifth lens group are fixed relative to an image plane, and the second lens group, the third lens group, and the fourth lens group are moved to change distances therebetween,

during magnification change from the wide-angle end to the telephoto end, the second lens group is moved from the object side toward the image plane side, and the fourth lens group is moved from the image plane side toward the object side,

during magnification change from the wide-angle end to the telephoto end, a third-fourth combined lens group, which is the combination of the third lens group and the fourth lens group, and the second lens group simultaneously pass through their respective points at which the imaging magnification is −1×,

the third-fourth combined lens group comprises at least one negative lens, and

the condition expression (1) below is satisfied:

29<νdG34n<37 (1),

where νdG34n is an average value of Abbe numbers with respect to the d-line of all negative lenses of the third-fourth combined lens group.

It is more preferred that the condition expression (1-1) below be satisfied:

29.5<νdG34n<36 (1-1).

It is preferred that, in the zoom lens of the invention, the first lens group consist of, in order from the object side, a first-group first lens having a negative refractive power, a first-group second lens having a positive refractive power, a first-group third lens having a positive refractive power, a first-group fourth lens having a positive refractive power, and a first-group fifth lens which is a positive meniscus lens with the convex surface toward the object side, and

the condition expressions (2) and (3) below be satisfied:

1.75<ndL11 (2), and

νdL11<45 (3),

where ndL11 is a refractive index with respect to the d-line of the first-group first lens, and νdL11 is an Abbe number with respect to the d-line of the first-group first lens. It is more preferred that the condition expression (2-1) and/or (3-1) below be satisfied:

1.80<ndL11 (2-1),

νdL11<40 (3-1).

It is preferred that the distance between the third lens group and the fourth lens group be maximized when they are on the wide angle side of their points at which the imaging magnification of the third-fourth combined lens group is −1×.

It is preferred that the distance between the third lens group and the fourth lens group be minimized at the telephoto end.

It is preferred that the distance between the second lens group and the third lens group at the telephoto end be smaller than that at the wide-angle end.

It is preferred that the third lens group comprise at least one aspheric surface.

It is preferred that the fourth lens group comprise at least one aspheric surface.

It is preferred that a second-group first lens, which is the most object-side negative lens of the second lens group, satisfy the condition expression (4) below:

25<νd21<45 (4),

where νd21 is an Abbe number with respect to the d-line of the second-group first lens. It is more preferred that the condition expression (4-1) below be satisfied:

28<νd21<40 (4-1).

The imaging apparatus of the invention comprises the above-described zoom lens of the invention.

It should be noted that the expression “consisting/consist of” as used herein means that the zoom lens may include, besides the elements recited above: lenses substantially without any power; optical elements other than lenses, such as a stop, a mask, a cover glass, and filters; and mechanical components, such as a lens flange, a lens barrel, an image sensor, a camera shake correction mechanism, etc.

The sign (positive or negative) with respect to the surface shape and the refractive power of any lens including an aspheric surface among the lenses described above is about the paraxial region.

The zoom lens of the invention consists of, in order from the object side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, the third lens group having a positive refractive power, the fourth lens group having a positive refractive power, and the fifth lens group having a positive refractive power, wherein, during magnification change, the first lens group and the fifth lens group are fixed relative to the image plane, and the second lens group, the third lens group, and the fourth lens group are moved to change distances therebetween, during magnification change from the wide-angle end to the telephoto end, the second lens group is moved from the object side toward the image plane side, and the fourth lens group is moved from the image plane side toward the object side, during magnification change from the wide-angle end to the telephoto end, the third-fourth combined lens group, which is the combination of the third lens group and the fourth lens group, and the second lens group simultaneously pass through their respective points at which the imaging magnification is −1×, the third-fourth combined lens group comprises at least one negative lens, and the condition expression (1) below is satisfied:

29<νdG34n<37 (1).

This configuration allows providing a compact zoom lens which has high optical performance and achieves both high magnification and wide angle.

The imaging apparatus of the invention, which is provided with the zoom lens of the invention, can be made compact, and allows obtaining high image-quality, high magnification and wide-angle images.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a sectional view illustrating the lens configuration of a zoom lens according to one embodiment of the invention (a zoom lens of Example 1),

FIG. 2 is a diagram showing optical paths through the zoom lens according to one embodiment of the invention (the zoom lens of Example 1),

FIG. 3 is a sectional view illustrating the lens configuration of a zoom lens of Example 2 of the invention,

FIG. 4 is a diagram showing optical paths through the zoom lens of Example 2 of the invention,

FIG. 5 is a sectional view illustrating the lens configuration of a zoom lens of Example 3 of the invention,

FIG. 6 is a diagram showing optical paths through the zoom lens of Example 3 of the invention,

FIG. 7 is a sectional view illustrating the lens configuration of a zoom lens of Example 4 of the invention,

FIG. 8 is a diagram showing optical paths through the zoom lens of Example 4 of the invention,

FIG. 9 is a sectional view illustrating the lens configuration of a zoom lens of Example 5 of the invention,

FIG. 10 is a diagram showing optical paths through the zoom lens of Example 5 of the invention,

FIG. 11 is a sectional view illustrating the lens configuration of a zoom lens of Example 6 of the invention,

FIG. 12 is a diagram showing optical paths through the zoom lens of Example 6 of the invention,

FIG. 13 is a sectional view illustrating the lens configuration of a zoom lens of Example 7 of the invention,

FIG. 14 is a diagram showing optical paths through the zoom lens of Example 7 of the invention,

FIG. 15 is a sectional view illustrating the lens configuration of a zoom lens of Example 8 of the invention,

FIG. 16 is a diagram showing optical paths through the zoom lens of Example 8 of the invention,

FIG. 17 is a sectional view illustrating the lens configuration of a zoom lens of Example 9 of the invention,

FIG. 18 is a diagram showing optical paths through the zoom lens of Example 9 of the invention,

FIG. 19 shows aberration diagrams of the zoom lens of Example 1 of the invention,

FIG. 20 shows aberration diagrams of the zoom lens of Example 2 of the invention,

FIG. 21 shows aberration diagrams of the zoom lens of Example 3 of the invention,

FIG. 22 shows aberration diagrams of the zoom lens of Example 4 of the invention,

FIG. 23 shows aberration diagrams of the zoom lens of Example 5 of the invention,

FIG. 24 shows aberration diagrams of the zoom lens of Example 6 of the invention,

FIG. 25 shows aberration diagrams of the zoom lens of Example 7 of the invention,

FIG. 26 shows aberration diagrams of the zoom lens of Example 8 of the invention,

FIG. 27 shows aberration diagrams of the zoom lens of Example 9 of the invention, and

FIG. 28 is a diagram illustrating the schematic configuration of an imaging apparatus according to an embodiment of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view illustrating the lens configuration of a zoom lens according to one embodiment of the invention, and FIG. 2 is a diagram showing optical paths through the zoom lens. The configuration example shown in FIGS. 1 and 2 is the same as the configuration of a zoom lens of Example 1, which will be described later. In FIGS. 1 and 2, the left side is the object side and the right side is the image plane side. An aperture stop St shown in each drawing does not necessarily represent the size and the shape thereof, but represents the position thereof along the optical axis Z. In the diagram showing optical paths of FIG. 2, an on-axis bundle of rays wa, a bundle of rays wb at the maximum angle of view, loci of movement (the arrows shown in the drawing) of lens groups during magnification change, and points at which the imaging magnification is −1× (the horizontal dashed line in the drawing) are shown.

As shown in FIG. 1, this zoom lens includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, an aperture stop St, and a fifth lens group G5 having a positive refractive power.

When this zoom lens is used with an imaging apparatus, it is preferred to provide a cover glass, a prism, and various filters, such as an infrared cutoff filter and a low-pass filter, etc., between the optical system and an image plane Sim depending on the configuration of the camera on which the lens is mounted. In the example shown in FIGS. 1 and 2, optical members PP1 to PP3 in the form of plane-parallel plates, which are assumed to represent such elements, are disposed between the lens system and the image plane Sim.

During magnification change, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim, and the second lens group G2, the third lens group G3, and the fourth lens group G4 are moved to change distances therebetween. During magnification change from the wide-angle end to the telephoto end, the second lens group G2 is moved from the object side toward the image plane side, and the fourth lens group G4 is moved from the image plane side toward the object side. Also, during magnification change from the wide-angle end to the telephoto end, a third-fourth combined lens group, which is the combination of the third lens group G3 and the fourth lens group G4, and the second lens group G2 simultaneously pass through their respective points at which the imaging magnification is −1×.

In this zoom lens, the second lens group G2 works to effect magnification change, and the third lens group G3 and the fourth lens group G4 work to correct for changes of the image plane along with magnification change. Further, the third lens group G3 and the fourth lens group G4 are moved relative to each other, and this allows successfully correcting for changes of spherical aberration and coma aberration during magnification change, as well as correcting for changes of the image plane during magnification change.

Further, configuring the third-fourth combined lens group, which is the combination of the third lens group G3 and the fourth lens group G4, and the second lens group G2 to simultaneously pass through their respective points at which the imaging magnification is −1× during magnification change from the wide-angle end to the telephoto end allows achieving a compact high-magnification zoom lens with successfully suppressed changes of aberrations.

The third-fourth combined lens group is configured to include at least one negative lens and satisfy the condition expression (1) below. Satisfying the lower limit of the condition expression (1) allows successfully correcting chromatic aberration at the fourth lens group G4. Satisfying the upper limit of condition expression (1) allows successfully correcting spherical aberration and coma aberration. That is, satisfying the condition expression (1) allows successfully correcting spherical aberration and coma aberration during magnification change while successfully correcting longitudinal chromatic aberration that occurs at the telephoto side during magnification change, and this allows achieving a high-magnification zoom lens with successfully suppressed changes of aberrations across the entire zoom range. It should be noted that higher performance can be obtained when the condition expression (1-1) below is satisfied.

29<νdG34n<37 (1),

29.5<νdG34n<36 (1-1),

where νdG34n is an average value of Abbe numbers with respect to the d-line of all negative lenses of the third-fourth combined lens group.

It is preferred that, in the zoom lens of this embodiment, the first lens group G1 include, in order from the object side, a first-group first lens L11 having a negative refractive power, a first-group second lens L12 having a positive refractive power, a first-group third lens L13 having a positive refractive power, a first-group fourth lens L14 having a positive refractive power, and a first-group fifth lens L15 which is a positive meniscus lens with the convex surface toward the object side, and the first lens group G1 satisfy the condition expressions (2) and (3) below. The above-described configuration of the first lens group G1 allows suppressing increase of the weight. Satisfying the condition expressions (2) and (3) allows successfully correcting spherical aberration and coma aberration while suppressing chromatic aberration across the entire zoom range. It should be noted that higher performance can be obtained when the condition expression (2-1) and/or (3-1) below is satisfied.

1.75<ndL11 (2),

1.80<ndL11 (2-1),

νdL11<45 (3),

νdL11<40 (3-1),

where ndL11 is a refractive index with respect to the d-line of the first-group first lens, and νdL11 is an Abbe number with respect to the d-line of the first-group first lens.

It is preferred that the distance between the third lens group G3 and the fourth lens group G4 be maximized when they are on the wide angle side of their points at which the imaging magnification of the third-fourth combined lens group is −1×. On the wide angle side of their points at which the imaging magnification of the third-fourth combined lens group is −1×, the ray height at the first-group first lens L11, which is at the most object-side position, is high, and the configuration where the distance between the third lens group G3 and the fourth lens group G4 is maximized when they are on the wide angle side of their points at which the imaging magnification of the third-fourth combined lens group is −1× is advantageous for achieving wide angle of view.

It is preferred that the distance between the third lens group G3 and the fourth lens group G4 be minimized at the telephoto end. Since the second lens group G2, the third lens group G3 and the fourth lens group G4 are brought close to each other at the telephoto end, the configuration where the distance between the third lens group G3 and the fourth lens group G4 is minimized at the telephoto end is advantageous for achieving high magnification.

It is preferred that the distance between the second lens group G2 and the third lens group G3 at the telephoto end be smaller than that at the wide-angle end. This configuration is advantageous for achieving high magnification.

It is preferred that the third lens group G3 include at least one aspheric surface. Providing the third lens group G3 with at least one aspheric surface allows more effective correction of spherical aberration and coma aberration. Also, this configuration enhances the advantageous effect provided by changing the distance between the third lens group G3 and the fourth lens group G4 during magnification change.

It is preferred that the fourth lens group G4 include at least one aspheric surface. Providing the fourth lens group G4, which is at the most image plane-side position among the lens groups which are moved during magnification change, with at least one aspheric surface allows successfully correcting spherical aberration across the entire zoom range.

It is preferred that a second-group first lens, which is the most object-side negative lens of the second lens group G2, satisfy the condition expression (4) below. Satisfying the lower limit of the condition expression (4) allows suppressing changes of primary lateral chromatic aberration and primary longitudinal chromatic aberration during magnification change. Satisfying the upper limit of condition expression (4) allows correcting secondary lateral chromatic aberration at the wide-angle end which occurs at the first lens group G1 when secondary longitudinal chromatic aberration at the telephoto end is corrected, thereby allowing well balanced correction of the secondary longitudinal chromatic aberration at the telephoto end, the lateral chromatic aberration at the telephoto end, and the secondary lateral chromatic aberration at the wide-angle end. It should be noted that higher performance can be obtained when the condition expression (4-1) below is satisfied.

25<νd21<45 (4),

28<νd21<40 (4-1),

where νd21 is an Abbe number with respect to the d-line of the second-group first lens.

In the example shown in FIGS. 1 and 2, the optical members PP1 to PP3 are disposed between the lens system and the image plane Sim. However, in place of disposing the various filters, such as a low-pass filter and a filter that cuts off a specific wavelength range, between the lens system and the image plane Sim, the various filters may be disposed between the lenses, or coatings having the same functions as the various filters may be applied to the lens surfaces of some of the lenses.

Next, numerical examples of the zoom lens of the invention are described.

First, a zoom lens of Example 1 is described. FIG. 1 is a sectional view illustrating the lens configuration of the zoom lens of Example 1. FIG. 2 is a diagram showing optical paths through the zoom lens of Example 1. It should be noted that, in FIGS. 1 and 2, and FIGS. 3 to 18 corresponding to Examples 2 to 9, which will be described later, the left side is the object side and the right side is the image plane side. The aperture stop St shown in the drawings does not necessarily represent the size and the shape thereof, but represents the position thereof along the optical axis Z. The diagram showing optical paths shows an on-axis bundle of rays wa, a bundle of rays wb at the maximum angle of view, loci of movement (the arrows shown in the drawing) of the lens groups during magnification change, and points at which the imaging magnification is −1× (the horizontal dashed line in the drawing).

In the zoom lens of Example 1, the first lens group G1 is formed by five lenses, i.e., lenses L11 to L15, the second lens group G2 is formed by six lenses, i.e., lenses L21 to L26, the third lens group G3 is formed by one lens L31, the fourth lens group G4 is formed by four lenses, i.e., lenses L41 to L44, and the fifth lens group G5 is formed by thirteen lenses, i.e., lenses L51 to L63.

Table 1 shows basic lens data of the zoom lens of Example 1, Table 2 shows data about specifications of the zoom lens, Table 3 shows data about surface distances to be changed of the zoom lens, and Table 4 shows data about aspheric coefficients of the zoom lens. In the following description, meanings of symbols used in the tables are explained with respect to Example 1 as an example. The same explanations basically apply to those with respect to Examples 2 to 9.

In the lens data shown in Table 1, each value in the column of “Surface No.” represents each surface number, where the object-side surface of the most object-side element is the 1st surface and the number is sequentially increased toward the image plane side, each value in the column of “Radius of Curvature” represents the radius of curvature of each surface, and each value in the column of “Surface Distance” represents the distance along the optical axis Z between each surface and the next surface. Each value in the column of “nd” represents the refractive index with respect to the d-line (the wavelength of 587.6 nm) of each optical element, each value in the column of “νd” represents the Abbe number with respect to the d-line (the wavelength of 587.6 nm) of each optical element, and each value in the column of “θg,F” represents the partial dispersion ratio of each optical element.

It should be noted that the partial dispersion ratio θg,F is expressed by the formula below:

θg,F=(Ng−NF)/(NF−NC),

where Ng is a refractive index with respect to the g-line, NF is a refractive index with respect to F-line, and NC is a refractive index with respect to the C-line.

The sign with respect to the radius of curvature is provided such that a positive radius of curvature indicates a surface shape that is convex toward the object side, and a negative radius of curvature indicates a surface shape that is convex toward the image plane side. The basic lens data also includes data of the aperture stop St and the optical members PP1 to PP3, and the surface number and the text “(stop)” are shown at the position in the column of the surface number corresponding to the aperture stop St. In the lens data shown in Table 1, the value of each surface distance that is changed during magnification change is represented by the symbol “DD[surface number]”. The numerical value corresponding to each DD[surface number] is shown in Table 3.

The data about specifications shown in Table 2 show values of zoom magnification, focal length f′, back focus Bf′, f-number FNo., and total angle of view 2ω.

With respect to the basic lens data, the data about specifications, and the data about surface distances to be changed, the unit of angle is degrees, and the unit of length is millimeters; however, any other suitable units may be used since optical systems are usable when they are proportionally enlarged or reduced.

In the lens data shown in Table 1, the symbol “*” is added to the surface number of each aspheric surface, and a numerical value of the paraxial radius of curvature is shown as the radius of curvature of each aspheric surface. In the data about aspheric coefficients shown in Table 4, the surface number of each aspheric surface and aspheric coefficients about each aspheric surface are shown. The aspheric coefficients are values of the coefficients KA and Am (where m=3, . . . , 20) in the formula of aspheric surface shown below:

Zd=C·h
²/{1+(1−KA·C²·h²)^1/2}+ΣAm·h^m,

where Zd is a depth of the aspheric surface (a length of a perpendicular line from a point with a height h on the aspheric surface to a plane tangent to the apex of the aspheric surface and perpendicular to the optical axis), h is the height (a distance from the optical axis), C is a reciprocal of the paraxial radius of curvature, and KA and Am are aspheric coefficients (where m=3, . . . , 20).

TABLE 1

Example 1 - Lens Data

Surface
Radius of
Surface

No.
Curvature
Distance
nd
νd
θg, F

1
2758.4371
4.4000
1.83400
37.16
0.57759

2
347.8180
2.2600

3
353.7539
24.3000
1.43387
95.20
0.53733

4
−666.4931
28.4000

5
418.1856
16.3800
1.43387
95.20
0.53733

6
−1937.2403
0.1100

7
230.5824
22.0200
1.43387
95.20
0.53733

8
2488.7921
2.1100

9
193.0855
13.7800
1.43875
94.93
0.53433

10
375.2290
DD[10]

*11
∞
2.8000
1.90366
31.32
0.59481

12
87.7087
3.6231

13
−276.3450
1.7000
2.00100
29.13
0.59952

14
61.6678
6.0762

15
−81.4336
1.7200
1.90043
37.37
0.57720

16
71.5780
4.6500
1.80809
22.76
0.63073

17
−491.0384
0.1200

18
197.1668
9.6900
1.80809
22.76
0.63073

19
−36.8210
1.7000
1.81600
46.62
0.55682

20
−1318.6602
DD[20]

21
228.3648
10.2000
1.49700
81.54
0.53748

*22
−164.6345
DD[22]

23
92.3550
13.4300
1.43700
95.10
0.53364

24
−316.4534
0.2500

*25
227.5428
5.7000
1.43700
95.10
0.53364

26
−613.2058
0.1200

27
264.9897
2.0200
1.80000
29.84
0.60178

28
78.0000
14.2700
1.43700
95.10
0.53364

29
−182.7058
DD[29]

30 (stop)
∞
5.2100

31
−143.8399
1.5000
1.77250
49.60
0.55212

32
62.1750
0.1200

33
45.5708
3.9900
1.80518
25.46
0.61572

34
122.8996
3.0300

35
−124.1653
1.5000
1.48749
70.23
0.53007

36
301.7353
6.3100

37
−119.7638
1.8000
1.80400
46.58
0.55730

38
79.0480
4.8500
1.80518
25.43
0.61027

39
−105.3465
1.6800

40
−50.3148
3.5000
1.88300
40.76
0.56679

41
49.1400
9.7900
1.54072
47.23
0.56511

42
−49.1400
0.1200

43
103.1349
14.2700
1.83481
42.73
0.56486

44
−1054.0996
7.9200

45
1676.5876
6.3800
1.72916
54.68
0.54451

46
−58.7491
0.1200

47
−788.2525
5.5000
1.95375
32.32
0.59015

48
37.8837
1.2100

49
40.1643
14.8800
1.56883
56.36
0.54890

50
−74.6440
0.1500

51
56.8324
5.7900
1.48749
70.23
0.53007

52
−93.6800
3.4700
1.95375
32.32
0.59015

53
−539.4314
0.2500

54
∞
1.0000
1.51633
64.14
0.53531

55
∞
0.0000

56
∞
33.0000
1.60863
46.60
0.56787

57
∞
13.2000
1.51633
64.14
0.53531

58
∞
17.3072

TABLE 2

Example 1 - Specifications (d-line)

Wide Angle End
Middle
Telephoto End

Zoom Magnification
1.0
48.0
103.0

f′
8.69
417.22
895.29

Bf′
47.19
47.19
47.19

FNo.
1.76
2.15
4.63

2ω[°]
68.6
1.6
0.8

TABLE 3

Example 1 - Distances with respect to Zoom

Wide Angle End
Middle
Telephoto End

DD[10]
2.4775
181.1074
187.6171

DD[20]
295.1513
38.9769
3.9195

DD[22]
3.0900
9.7300
2.5900

DD[29]
1.9491
72.8536
108.5413

TABLE 4

Example 1 - Aspheric Coefficients

Surface No.

11
22
25

KA
1.0000000E+00
1.0000000E+00
1.0000000E+00

A4
5.6023431E−07
1.6745016E−07
−3.2928660E−07

A6
5.5737260E−10
−4.2600970E−10
−6.3312762E−10

A8
−5.9458545E−12
1.1531254E−12
1.8433516E−12

A10
3.2911833E−14
−1.7585791E−15
−3.2645155E−15

A12
−9.8784592E−17
1.6366241E−18
3.6730696E−18

A14
1.4175173E−19
−9.2252153E−22
−2.6523443E−21

A16
−2.4068796E−23
2.9245702E−25
1.1923581E−24

A18
−1.6366837E−25
−4.1873551E−29
−3.0407546E−28

A20
1.3060328E−28
8.2582942E−34
3.3622504E−32

FIG. 19 shows aberration diagrams of the zoom lens of Example 1. The aberration diagrams shown at the top of FIG. 19 are those of spherical aberration, offense against the sine condition, astigmatism, distortion, and lateral chromatic aberration at the wide-angle end in this order from the left side, the aberration diagrams shown at the middle of FIG. 19 are those of spherical aberration, offense against the sine condition, astigmatism, distortion, and lateral chromatic aberration at the middle position in this order from the left side, and the aberration diagrams shown at the bottom of FIG. 19 are those of spherical aberration, offense against the sine condition, astigmatism, distortion, and lateral chromatic aberration at the telephoto end in this order from the left side. These aberration diagrams show aberrations when the object distance is infinity. The aberration diagrams of spherical aberration, offense against the sine condition, astigmatism, and distortion show those with respect to the d-line (the wavelength of 587.6 nm), which is used as a reference wavelength. The aberration diagrams of spherical aberration show those with respect to the d-line (the wavelength of 587.6 nm), the C-line (the wavelength of 656.3 nm), the F-line (the wavelength of 486.1 nm), and the g-line (the wavelength of 435.8 nm) in the solid line, the long dashed line, the short dashed line, and the gray solid line, respectively. The aberration diagrams of astigmatism show those in the sagittal direction and the tangential direction in the solid line, and the short dashed line, respectively. The aberration diagrams of lateral chromatic aberration show those with respect to the C-line (the wavelength of 656.3 nm) the F-line (the wavelength of 486.1 nm), and the g-line (the wavelength of 435.8 nm) in the long dashed line, the short dashed line, and the gray solid line, respectively. The “FNo.” in the aberration diagrams of spherical aberration and offense against the sine condition means “f-number”, and the “ω” in the other aberration diagrams means “half angle of view”.

Next, a zoom lens of Example 2 is described. FIG. 3 is a sectional view illustrating the lens configuration of the zoom lens of Example 2, and FIG. 4 is a diagram showing optical paths through the zoom lens. The zoom lens of Example 2 differs from the zoom lens of Example 1 in that, in the zoom lens of Example 2, the fourth lens group G4 is formed by five lenses, i.e., lenses L41 to L45, and the fifth lens group G5 is formed by fourteen lenses, i.e., lenses L51 to L64. Table 5 shows basic lens data of the zoom lens of Example 2, Table 6 shows data about specifications of the zoom lens, Table 7 shows data about surface distances to be changed of the zoom lens, Table 8 shows data about aspheric coefficients of the zoom lens, and FIG. 20 shows aberration diagrams of the zoom lens.

TABLE 5

Example 2 - Lens Data

Surface
Radius of
Surface

No.
Curvature
Distance
nd
νd
θg, F

1
1621.8264
4.4000
1.83400
37.34
0.57908

2
321.1166
2.3074

3
319.8571
24.6282
1.43387
95.20
0.53733

4
−846.0399
27.3529

5
351.3661
20.0650
1.43387
95.20
0.53733

6
−1402.9128
0.1200

7
233.6545
20.0438
1.43387
95.20
0.53733

8
1255.5213
2.0341

9
192.7395
13.1724
1.43875
94.93
0.53433

10
363.0563
DD[10]

*11
−2777777.9346
2.8000
1.90366
31.32
0.59481

12
98.7837
4.9567

13
−102.1714
1.7000
2.00100
29.13
0.59952

14
66.3514
5.8916

15
−81.8572
1.7000
1.95375
32.32
0.59015

16
72.4934
6.6056
1.80809
22.76
0.63073

17
−121.1396
0.1200

18
188.8503
10.2510
1.80809
22.76
0.63073

19
−39.5623
1.7000
1.81600
46.62
0.55682

20
753.8351
DD[20]

21
268.1342
9.0636
1.59282
68.63
0.54414

*22
−186.9580
DD[22]

23
116.3677
15.0601
1.43875
94.93
0.53433

24
−135.2846
2.0000
1.59270
35.31
0.59336

25
−288.4689
0.1200

*26
210.0268
8.6054
1.43875
94.93
0.53433

27
−250.1556
0.1200

28
168.6619
2.0000
1.80000
29.84
0.60178

29
73.2023
12.5372
1.43875
94.93
0.53433

30
−456.7046
DD[30]

31 (stop)
∞
5.0115

32
−84.0203
1.5000
1.77250
49.60
0.55212

33
61.9110
0.1200

34
46.2228
4.5175
1.80518
25.42
0.61616

35
211.3971
1.8300

36
−177.3816
1.5000
1.48749
70.23
0.53007

37
125.6004
7.2756

38
−114.0392
1.8000
1.80400
46.58
0.55730

39
63.0729
6.2400
1.80518
25.43
0.61027

40
−105.3906
1.9324

41
−46.7551
2.1750
2.00100
29.13
0.59952

42
492.1494
6.8481
1.51823
58.90
0.54567

43
−38.0880
0.1200

44
344.0131
18.2262
1.59270
35.31
0.59336

45
−192.6033
6.7109

46
654.7236
9.9919
1.68893
31.07
0.60041

47
−87.5160
0.1200

48
201.4706
7.2349
1.91082
35.25
0.58224

49
45.5310
0.1910

50
42.6154
7.8868
1.51742
52.43
0.55649

51
−76.2445
0.1200

52
70.9272
6.7891
1.48749
70.23
0.53007

53
−49.5244
1.8295
2.00100
29.13
0.59952

54
−10986903.2517
3.5616
1.51823
58.90
0.54567

55
−79.2918
0.2498

56
∞
1.0000
1.51633
64.14
0.53531

57
∞
0.0000

58
∞
33.0000
1.60863
46.60
0.56787

59
∞
13.2000
1.51633
64.14
0.53531

60
∞
17.3478

TABLE 6

Example 2 − Specifications (d-line)

Wide Angle End
Middle
Telephoto End

Zoom Magnification
1.0
48.0
103.0

f′
8.70
417.36
895.60

Bf′
47.48
47.48
47.48

FNo.
1.76
2.14
4.61

2ω[°]
69.0
1.6
0.8

TABLE 7

Example 2 - Distances with respect to Zoom

Wide Angle End
Middle
Telephoto End

DD[10]
2.1062
178.0467
184.5595

DD[20]
291.3621
38.9988
3.9233

DD[22]
1.2197
7.1626
1.2218

DD[30]
3.5802
74.0602
108.5638

TABLE 8

Example 2 - Aspheric Coefficients

Surface No.

11
22
26

KA
1.0000000E+00
1.0000000E+00
1.0000000E+00

A4
1.3617401E−06
6.8856999E−08
−2.8066697E−07

A6
2.1211905E−11
5.4670539E−12
−3.1663334E−12

A8
−8.7707146E−14
4.8525628E−15
4.6640532E−15

A10
4.1075859E−16
−1.8961447E−18
−1.6978421E−18

Next, a zoom lens of Example 3 is described. FIG. 5 is a sectional view illustrating the lens configuration of the zoom lens of Example 3, and FIG. 6 is a diagram showing optical paths through the zoom lens. The zoom lens of Example 3 is formed by the same number of lenses as the zoom lens of Example 2. Table 9 shows basic lens data of the zoom lens of Example 3, Table 10 shows data about specifications of the zoom lens, Table 11 shows data about surface distances to be changed of the zoom lens, Table 12 shows data about aspheric coefficients of the zoom lens, and FIG. 21 shows aberration diagrams of the zoom lens.

TABLE 9

Example 3 - Lens Data

Radius of

Surface No.
Curvature
Surface Distance
nd
νd
θg, F

1
3401.6455
4.4000
1.83400
37.16
0.57759

2
351.0096
1.8868

3
342.2938
25.8399
1.43387
95.20
0.53733

4
−617.1126
27.5208

5
376.1863
18.8689
1.43387
95.20
0.53733

6
−1480.7062
0.1200

7
231.2856
19.2460
1.43387
95.20
0.53733

8
989.5463
2.0149

9
197.6466
13.4721
1.49700
81.54
0.53748

10
375.6095
DD[10]

*11
∞
3.0000
2.00069
25.46
0.61364

12
117.2892
4.6982

13
−94.1530
1.7000
2.00100
29.13
0.59952

14
62.7238
6.3333

15
−68.8577
1.7000
2.00100
29.13
0.59952

16
82.7458
7.1864
1.80809
22.76
0.63073

17
−83.6047
0.1200

18
203.1800
11.2541
1.80809
22.76
0.63073

19
−36.9251
1.7000
1.81600
46.62
0.55682

20
1365.5915
DD[20]

21
241.0954
7.8946
1.59282
68.63
0.54414

*22
−241.6904
DD[22]

23
103.8609
15.7378
1.43875
94.93
0.53433

24
−143.9534
2.0000
1.59270
35.31
0.59336

25
−204.8217
0.1201

*26
288.8799
5.1397
1.43875
94.93
0.53433

27
−602.9309
0.1200

28
148.1149
2.0000
1.71736
29.52
0.60483

29
61.8772
14.4753
1.43875
94.93
0.53433

30
−435.0225
DD[30]

31 (stop)
∞
5.1564

32
−110.6957
1.5000
1.77250
49.60
0.55212

33
56.7314
0.1198

34
44.3333
4.8711
1.80518
25.42
0.61616

35
303.5707
1.8584

36
−109.1693
1.5000
1.48749
70.23
0.53007

37
112.1803
7.6633

38
−86.9018
1.8000
1.80400
46.58
0.55730

39
53.6132
6.4361
1.80518
25.43
0.61027

40
−72.8379
1.2686

41
−46.5273
3.3491
2.00069
25.46
0.61364

42
801.7665
6.5335
1.51633
64.14
0.53531

43
−41.5451
0.1200

44
−624.9701
16.7392
1.59270
35.31
0.59336

45
−160.0078
7.1806

46
−556.3538
4.1093
1.76182
26.52
0.61361

47
−78.7616
0.1250

48
281.5288
4.7676
1.88300
40.76
0.56679

49
51.2333
0.1377

50
46.8988
8.1690
1.51633
64.14
0.53531

51
−67.6554
0.1198

52
65.7102
7.2583
1.48749
70.23
0.53007

53
−49.7664
5.0000
2.00100
29.13
0.59952

54
1098.4109
7.7546
1.51633
64.14
0.53531

55
−77.0153
0.2498

56
∞
1.0000
1.51633
64.14
0.53531

57
∞
0.0000

58
∞
33.0000
1.60863
46.60
0.56787

59
∞
13.2000
1.51633
64.14
0.53531

60
∞
17.3402

TABLE 10

Example 3 - Specifications (d-line)

Wide Angle End
Middle
Telephoto End

Zoom Magnification
1.0
48.0
103.0

f′
8.69
417.11
895.06

Bf′
47.47
47.47
47.47

FNo.
1.76
2.16
4.63

2ω [°]
69.2
1.6
0.8

TABLE 11

Example 3 - Distances with respect to Zoom

Wide Angle End
Middle
Telephoto End

DD[10]
2.0564
178.6194
184.7805

DD[20]
292.3116
37.5494
2.9266

DD[22]
1.1659
9.3749
1.1694

DD[30]
3.5498
73.5399
110.2071

TABLE 12

Example 3 - Aspheric Coefficients

Surface No.

11
22
26

KA
1.0000000E+00
1.0000000E+00
1.0000000E+00

A4
1.5986805E−06
6.3959084E−08
−3.0646162E−07

A6
6.2257478E−11
3.1977885E−12
−6.8530435E−12

A8
−1.1157694E−13
6.8145266E−15
5.0409987E−15

A10
5.4339717E−16
−2.4409123E−18
−1.8612932E−18

Next, a zoom lens of Example 4 is described. FIG. 7 is a sectional view illustrating the lens configuration of the zoom lens of Example 4, and FIG. 8 is a diagram showing optical paths through the zoom lens. The zoom lens of Example 4 is formed by the same number of lenses as the zoom lens of Example 2. Table 13 shows basic lens data of the zoom lens of Example 4, Table 14 shows data about specifications of the zoom lens, Table 15 shows data about surface distances to be changed of the zoom lens, Table 16 shows data about aspheric coefficients of the zoom lens, and FIG. 22 shows aberration diagrams of the zoom lens.

TABLE 13

Example 4 - Lens Data

Radius of

Surface No.
Curvature
Surface Distance
nd
νd
θg, F

1
3987.0357
4.4000
1.83400
37.16
0.57759

2
353.1677
1.8868

3
343.7377
25.8399
1.43387
95.20
0.53733

4
−600.0703
27.5208

5
377.0135
18.8689
1.43387
95.20
0.53733

6
−1427.2777
0.1200

7
232.5651
19.2460
1.43387
95.20
0.53733

8
1032.3959
2.0149

9
190.7154
13.4721
1.49700
81.54
0.53748

10
363.3054
DD[10]

*11
∞
3.0000
2.00069
25.46
0.61364

12
109.9598
4.7781

13
−86.4093
1.7000
2.00100
29.13
0.59952

14
60.8206
6.1620

15
−67.0110
1.7000
2.00100
29.13
0.59952

16
99.6297
6.8701
1.80809
22.76
0.63073

17
−77.3020
0.1202

18
211.9794
12.1921
1.80809
22.76
0.63073

19
−33.5155
1.7000
1.83481
42.73
0.56486

20
−3739.2878
DD[20]

21
245.2840
7.7949
1.59282
68.63
0.54414

*22
−242.6299
DD[22]

23
98.6538
17.0946
1.43875
94.93
0.53433

24
−129.2951
2.0000
1.59270
35.31
0.59336

25
−232.6237
0.1201

*26
177.7072
7.3589
1.43875
94.93
0.53433

27
−392.0255
0.1200

28
152.2737
2.0000
1.80610
33.27
0.58845

29
62.6647
14.1273
1.43875
94.93
0.53433

30
−437.9227
DD[30]

31 (stop)
∞
5.2201

32
−101.8698
1.5000
1.77250
49.60
0.55212

33
58.9475
0.1198

34
45.0327
4.4319
1.80518
25.42
0.61616

35
187.8627
2.1344

36
−103.3506
1.5000
1.48749
70.23
0.53007

37
102.5090
7.6689

38
−92.2208
1.8000
1.80400
46.58
0.55730

39
53.4800
7.1105
1.80518
25.43
0.61027

40
−70.0090
1.2248

41
−46.5357
3.4999
2.00069
25.46
0.61364

42
853.2807
6.5996
1.51633
64.14
0.53531

43
−41.9580
0.1200

44
−1519.5243
15.9644
1.59270
35.31
0.59336

45
−158.9375
7.1691

46
−495.7287
4.4353
1.76182
26.52
0.61361

47
−81.0614
0.1252

48
227.7152
9.6335
1.88300
40.76
0.56679

49
52.1877
0.1248

50
46.3121
8.1613
1.51633
64.14
0.53531

51
−70.4373
0.1198

52
64.0581
8.3921
1.48749
70.23
0.53007

53
−50.1528
2.3091
2.00100
29.13
0.59952

54
461.9674
4.1378
1.51633
64.14
0.53531

55
−81.3407
0.2498

56
∞
1.0000
1.51633
64.14
0.53531

57
∞
0.0000

58
∞
33.0000
1.60863
46.60
0.56787

59
∞
13.2000
1.51633
64.14
0.53531

60
∞
17.3349

TABLE 14

Example 4 - Specifications (d-line)

Wide Angle End
Middle
Telephoto End

Zoom Magnification
1.0
48.0
103.0

f′
8.69
417.07
894.96

Bf′
47.46
47.46
47.46

FNo.
1.76
2.15
4.62

2ω [°]
69.0
1.6
0.8

TABLE 15

Example 4 - Distances with respect to Zoom

Wide Angle End
Middle
Telephoto End

DD[10]
2.5703
176.3673
182.4081

DD[20]
288.2875
36.9367
2.8736

DD[22]
1.1146
9.3236
1.1181

DD[30]
3.5225
72.8673
109.0952

TABLE 16

Example 4 - Aspheric Coefficients

Surface No.

11
22
26

KA
1.0000000E+00
1.0000000E+00
1.0000000E+00

A4
1.8116407E−06
5.7079490E−08
−3.6373275E−07

A6
8.9293870E−11
8.4712262E−12
−5.3119700E−12

A8
−9.6769912E−14
5.3128698E−15
2.7758261E−15

A10
6.9368360E−16
−2.3597980E−18
−1.5135427E−18

Next, a zoom lens of Example 5 is described. FIG. 9 is a sectional view illustrating the lens configuration of the zoom lens of Example 5, and FIG. 10 is a diagram showing optical paths through the zoom lens. The zoom lens of Example 5 differs from the zoom lens of Example 2 in that, in the zoom lens of Example 5, the third lens group G3 is formed by three lenses, i.e., lenses L31 to L33, and the fourth lens group G4 is formed by three lenses, i.e., lenses L41 to L43. Table 17 shows basic lens data of the zoom lens of Example 5, Table 18 shows data about specifications of the zoom lens, Table 19 shows data about surface distances to be changed of the zoom lens, Table 20 shows data about aspheric coefficients of the zoom lens, and FIG. 23 shows aberration diagrams of the zoom lens.

TABLE 17

Example 5 - Lens Data

Radius of

Surface No.
Curvature
Surface Distance
nd
νd
θg, F

1
6979.0358
4.4000
1.83400
37.16
0.57759

2
361.3278
1.8868

3
350.6223
25.8399
1.43387
95.20
0.53733

4
−584.8124
27.5208

5
386.8086
18.8689
1.43387
95.20
0.53733

6
−1291.2649
0.1200

7
237.4752
19.2460
1.43387
95.20
0.53733

8
1163.7767
2.0149

9
189.3873
13.4721
1.49700
81.54
0.53748

10
354.9406
DD[10]

*11
∞
3.0000
1.90366
31.32
0.59481

12
81.4565
5.4302

13
−87.5993
1.7000
2.00100
29.13
0.59952

14
81.5555
5.5072

15
−68.9623
1.7000
2.00100
29.13
0.59952

16
91.5134
7.3631
1.80809
22.76
0.63073

17
−71.3250
0.1484

18
143.1363
11.4349
1.80809
22.76
0.63073

19
−35.8094
1.7000
1.88300
40.76
0.56679

20
325.8952
DD[20]

21
629.3569
7.8153
1.59282
68.63
0.54414

*22
−144.9999
0.1200

23
110.7548
9.7232
1.43875
94.93
0.53433

24
−954.5669
2.0000
1.59270
35.31
0.59336

25
259.2839
DD[25]

*26
119.9299
15.1215
1.43875
94.93
0.53433

27
−187.9074
0.1201

28
131.8988
2.0000
1.80000
29.84
0.60178

29
67.6155
14.6824
1.43875
94.93
0.53433

30
−244.5287
DD[30]

31 (stop)
∞
5.1723

32
−102.3335
1.5000
1.77250
49.60
0.55212

33
59.4127
0.1198

34
44.8915
4.5220
1.80518
25.42
0.61616

35
207.0999
2.0524

36
−104.6229
1.5000
1.48749
70.23
0.53007

37
102.8295
7.7469

38
−92.3741
1.8000
1.80400
46.58
0.55730

39
54.3270
6.8091
1.80518
25.43
0.61027

40
−70.1486
1.2530

41
−46.5200
3.4514
2.00069
25.46
0.61364

42
859.6076
6.5702
1.51633
64.14
0.53531

43
−41.9951
0.1200

44
−1480.4554
16.3196
1.59270
35.31
0.59336

45
−160.6608
7.4504

46
−492.6416
4.1681
1.76182
26.52
0.61361

47
−81.1062
0.1232

48
229.0858
9.5504
1.88300
40.76
0.56679

49
52.0025
0.1248

50
46.5291
8.3550
1.51633
64.14
0.53531

51
−70.4018
0.1198

52
64.0556
8.4215
1.48749
70.23
0.53007

53
−50.1526
2.3421
2.00100
29.13
0.59952

54
468.8769
4.1547
1.51633
64.14
0.53531

55
−82.2655
0.2498

56
∞
1.0000
1.51633
64.14
0.53531

57
∞
0.0000

58
∞
33.0000
1.60863
46.60
0.56787

59
∞
13.2000
1.51633
64.14
0.53531

60
∞
17.3247

TABLE 18

Example 5 - Specifications (d-line)

Wide Angle End
Middle
Telephoto End

Zoom Magnification
1.0
48.0
103.0

f′
8.69
417.32
895.50

Bf′
47.45
47.45
47.45

FNo.
1.76
2.16
4.64

2ω [°]
69.4
1.6
0.8

TABLE 19

Example 5 - Distances with respect to Zoom

Wide Angle End
Middle
Telephoto End

DD[10]
2.1031
179.0734
184.9796

DD[20]
281.9252
39.0922
2.9115

DD[25]
6.7024
6.0644
1.1808

DD[30]
2.4569
68.9575
104.1158

TABLE 20

Example 5 - Aspheric Coefficients

Surface No.

11
22
26

KA
1.0000000E+00
1.0000000E+00
1.0000000E+00

A4
1.5730579E−06
3.4196618E−08
−3.3795215E−07

A6
6.5856876E−11
3.6752602E−11
4.0016204E−11

A8
−2.2114707E−13
−6.0806094E−15
−1.5474428E−14

A10
6.9670557E−16
5.8997611E−19
2.3256752E−18

Next, a zoom lens of Example 6 is described. FIG. 11 is a sectional view illustrating the lens configuration of the zoom lens of Example 6, and FIG. 12 is a diagram showing optical paths through the zoom lens. The zoom lens of Example 6 differs from the zoom lens of Example 1 in that, in the zoom lens of Example 6, the fourth lens group G4 is formed by five lenses, i.e., lenses L41 to L45. Table 21 shows basic lens data of the zoom lens of Example 6, Table 22 shows data about specifications of the zoom lens, Table 23 shows data about surface distances to be changed of the zoom lens, Table 24 shows data about aspheric coefficients of the zoom lens, and FIG. 24 shows aberration diagrams of the zoom lens.

TABLE 21

Example 6 - Lens Data

Radius of

Surface No.
Curvature
Surface Distance
nd
νd
θg, F

1
2149.2163
4.4000
1.83400
37.16
0.57759

2
364.4008
1.8100

3
357.1559
24.5800
1.43387
95.18
0.53733

4
−629.0299
32.8500

5
363.8700
15.6200
1.43387
95.18
0.53733

6
∞
0.1200

7
310.1672
17.8400
1.43387
95.18
0.53733

8
∞
2.9000

9
173.0993
14.6700
1.43875
94.94
0.53433

10
310.0848
DD[10]

*11
109963.7968
2.8000
1.90366
31.31
0.59481

12
56.5266
8.6300

13
−84.6070
1.6000
2.00100
29.13
0.59952

14
321.4052
6.6700

15
−62.2824
1.6000
1.95375
32.32
0.59015

16
115.4560
6.9400
1.89286
20.36
0.63944

17
−73.9497
0.1200

18
962.3821
7.7100
1.80518
25.43
0.61027

19
−51.3780
1.6200
1.80400
46.58
0.55730

20
2303.8825
DD[20]

21
170.3657
9.7800
1.49700
81.54
0.53748

*22
−209.1383
DD[22]

23
137.4359
11.9100
1.43700
95.10
0.53364

24
−175.8090
2.0000
1.59270
35.31
0.59336

25
−597.2019
0.2500

*26
188.3526
9.3100
1.43700
95.10
0.53364

27
−195.4929
0.1200

28
247.3158
2.0000
1.80000
29.84
0.60178

29
94.0850
12.0500
1.43700
95.10
0.53364

30
−217.6314
DD[30]

31 (stop)
∞
5.0700

32
−188.3440
1.4000
1.77250
49.60
0.55212

33
62.0923
0.1200

34
43.4903
4.5500
1.80518
25.42
0.61616

35
151.4362
2.0300

36
−188.3403
1.4000
1.48749
70.24
0.53007

37
72.1812
9.2600

38
−50.3918
3.2500
1.80440
39.59
0.57297

39
63.9801
8.1300
1.80518
25.43
0.61027

40
−46.8126
0.3400

41
−50.8827
1.6600
1.95375
32.32
0.59015

42
56.9580
7.3800
1.72916
54.68
0.54451

43
−73.6910
0.1200

44
215.7126
10.9800
1.73800
32.26
0.58995

45
−215.7126
8.8100

46
182.7540
17.0600
1.67003
47.23
0.56276

47
−103.9363
0.1200

48
148.7010
2.9000
1.95375
32.32
0.59015

49
44.8210
0.8500

50
44.9406
10.1300
1.51633
64.14
0.53531

51
−64.7286
0.1200

52
65.6410
5.1900
1.48749
70.24
0.53007

53
−65.6410
1.8500
1.95375
32.32
0.59015

54
∞
0.2500

55
∞
1.0000
1.51633
64.14
0.53531

56
∞
0.0000

57
∞
33.0000
1.60863
46.60
0.56787

58
∞
13.2000
1.51633
64.14
0.53531

59
∞
17.3299

TABLE 22

Example 6 - Specifications (d-line)

Wide Angle End
Middle
Telephoto End

Zoom
1.0
48.0
77.0

Magnification

f′
9.30
446.26
715.88

Bf′
47.46
47.46
47.46

FNo.
1.76
2.27
3.64

2ω[°]
65.0
1.4
0.8

TABLE 23

Example 6 - Distances with respect to Zoom

Wide Angle End
Middle
Telephoto End

DD[10]
2.8554
186.6407
191.1526

DD[20]
291.2076
26.4986
3.9764

DD[22]
1.4039
6.7033
1.9940

DD[30]
3.1233
78.7475
101.4671

TABLE 24

Example 6 - Aspheric Coefficients

Surface No.

11
22
26

KA
1.0000000E+00
1.0000000E+00
1.0000000E+00

A3
−1.8505954E−21
−7.1721817E−22
6.6507804E−22

A4
4.0660287E−07
1.6421968E−07
−2.8081272E−07

A5
−6.4796240E−09
−5.6511999E−09
−8.0962001E−09

A6
8.4021729E−10
1.7414539E−10
2.8172499E−10

A7
−4.5016908E−11
7.4176985E−13
−1.6052722E−12

A8
4.3463314E−13
−9.7299399E−14
−1.0541094E−13

A9
3.5919548E−14
1.1281878E−15
2.1399424E−15

A10
−8.9257498E−16
−4.4848875E−19
−1.0917621E−17

Next, a zoom lens of Example 7 is described. FIG. 13 is a sectional view illustrating the lens configuration of the zoom lens of Example 7, and FIG. 14 is a diagram showing optical paths through the zoom lens. The zoom lens of Example 7 is formed by the same number of lenses as the zoom lens of Example 6. Table 25 shows basic lens data of the zoom lens of Example 7, Table 26 shows data about specifications of the zoom lens, Table 27 shows data about surface distances to be changed of the zoom lens, Table 28 shows data about aspheric coefficients of the zoom lens, and FIG. 25 shows aberration diagrams of the zoom lens.

TABLE 25

Example 7 - Lens Data

Surface
Radius of
Surface

No.
Curvature
Distance
nd
νd
θg, F

1
3475.3702
4.4000
1.83400
37.16
0.57759

2
372.4955
5.0357

3
366.9209
23.9056
1.43387
95.18
0.53733

4
−682.9236
32.9837

5
454.1605
18.2207
1.43387
95.18
0.53733

6
−986.9790
0.1100

7
253.2817
19.6205
1.43387
95.18
0.53733

8
1947.2332
2.0966

9
173.1049
13.3055
1.43875
94.94
0.53433

10
292.3182
DD[10]

*11
841.9448
2.8000
1.95375
32.32
0.59015

12
64.1193
5.9910

13
−139.9177
1.7000
2.00100
29.13
0.59952

14
103.9852
6.2479

15
−79.6795
1.7000
1.95375
32.32
0.59015

16
86.5057
6.0539
1.84666
23.83
0.61603

17
−153.6438
0.1200

18
487.2966
11.2129
1.80809
22.76
0.63073

19
−38.0425
1.7000
1.81600
46.62
0.55682

20
−403.3473
DD[20]

21
152.9719
9.0813
1.59282
68.62
0.54414

*22
−317.0888
DD[22]

23
126.9262
12.2707
1.43700
95.10
0.53364

24
−172.5904
2.0000
1.59270
35.31
0.59336

25
−585.3741
0.1200

*26
225.1390
9.6209
1.43700
95.10
0.53364

27
−151.7222
0.1200

28
263.3903
2.0000
1.80000
29.84
0.60178

29
88.7553
11.7320
1.43700
95.10
0.53364

30
−232.3846
DD[30]

31 (stop)
∞
4.1987

32
−163.6964
1.5000
1.78800
47.37
0.55598

33
66.6579
0.1200

34
46.2167
4.0850
1.76182
26.52
0.61361

35
152.4046
2.8557

36
−98.8029
1.5000
1.48749
70.24
0.53007

37
67.8883
8.2120

38
−103.2169
1.8000
1.83481
42.72
0.56486

39
62.9851
10.1794
1.84666
23.83
0.61603

40
−74.4274
0.8479

41
−63.4207
3.4958
1.95375
32.32
0.59015

42
101.4326
7.1124
1.60311
60.64
0.54148

43
−57.8040
0.1200

44
127.8051
19.0888
1.61772
49.81
0.56035

45
−5769.3694
7.1792

46
244.7704
5.7290
1.58913
61.13
0.54067

47
−108.1583
0.1200

48
234.3868
7.4062
1.95375
32.32
0.59015

49
50.8661
0.7019

50
51.8722
7.3813
1.58913
61.13
0.54067

51
−74.1423
0.1500

52
64.9784
5.7488
1.48749
70.24
0.53007

53
−92.6312
3.8115
1.95375
32.32
0.59015

54
−6201.4507
0.2500

55
∞
1.0000
1.51633
64.14
0.53531

56
∞
0.0000

57
∞
33.0000
1.60863
46.60
0.56787

58
∞
13.2000
1.51633
64.14
0.53531

59
∞
17.5370

TABLE 26

Example 7 - Specifications (d-line)

Wide Angle End
Middle
Telephoto End

Zoom
1.0
48.0
77.0

Magnification

f′
9.27
444.91
713.71

Bf′
47.67
47.67
47.67

FNo.
1.76
2.30
3.70

2ω[°]
65.4
1.4
0.8

TABLE 27

Example 7 - Distances with respect to Zoom

Wide Angle End
Middle
Telephoto End

DD[10]
2.5512
185.1434
189.5366

DD[20]
280.2287
26.2040
3.9658

DD[22]
8.3473
5.5415
1.2476

DD[30]
2.3437
76.5819
98.7208

TABLE 28

Example 7 - Aspheric Coefficients

Surface No.

11
22
26

KA
1.0000000E+00
1.0000000E+00
1.0000000E+00

A4
2.7395225E−07
1.1987876E−07
−4.8883780E−07

A6
−4.8949478E−11
2.4237606E−11
2.3182674E−11

A8
1.8491556E−13
−2.9894229E−15
−3.2052197E−15

A10
−1.9679971E−16
−3.3833557E−19
9.7256769E−20

Next, a zoom lens of Example 8 is described. FIG. 15 is a sectional view illustrating the lens configuration of the zoom lens of Example 8, and FIG. 16 is a diagram showing optical paths through the zoom lens. The zoom lens of Example 8 is formed by the same number of lenses as the zoom lens of Example 6. Table 29 shows basic lens data of the zoom lens of Example 8, Table 30 shows data about specifications of the zoom lens, Table 31 shows data about surface distances to be changed of the zoom lens, Table 32 shows data about aspheric coefficients of the zoom lens, and FIG. 26 shows aberration diagrams of the zoom lens.

TABLE 29

Example 8 - Lens Data

Surface
Radius of
Surface

No.
Curvature
Distance
nd
νd
θg, F

1
3055.3747
4.4000
1.83400
37.16
0.57759

2
372.1635
1.9397

3
366.5958
22.9318
1.43387
95.18
0.53733

4
−745.5153
30.9741

5
447.2910
17.8731
1.43387
95.18
0.53733

6
−1022.1176
0.1202

7
250.7002
20.0594
1.43387
95.18
0.53733

8
2497.1844
2.0893

9
173.5560
13.5554
1.43875
94.94
0.53433

10
296.5606
DD[10]

*11
−536.2036
2.8000
1.90366
31.31
0.59481

12
59.0403
11.2534

13
−94.9158
1.7000
2.00100
29.13
0.59952

14
266.5653
4.8654

15
−73.3496
1.7000
1.95375
32.32
0.59015

16
114.5658
6.3833
1.89286
20.36
0.63944

17
−87.7169
0.1202

18
660.4559
10.0644
1.80518
25.43
0.61027

19
−42.5900
1.7000
1.81600
46.62
0.55682

20
2697.8154
DD[20]

21
163.2078
9.6780
1.53775
74.70
0.53936

*22
−262.8890
DD[22]

23
161.2674
13.7150
1.43700
95.10
0.53364

24
−135.7995
2.0000
1.59270
35.31
0.59336

25
−425.7431
0.2500

*26
165.9002
10.7003
1.43700
95.10
0.53364

27
−172.4386
0.1734

28
209.1264
2.0000
1.80000
29.84
0.60178

29
88.7369
11.9532
1.43700
95.10
0.53364

30
−285.7611
DD[30]

31 (stop)
∞
4.8788

32
−183.6883
1.5000
1.72916
54.68
0.54451

33
65.0566
0.1200

34
46.1588
3.1785
1.89286
20.36
0.63944

35
74.9110
3.4315

36
−155.5064
1.5000
1.48749
70.24
0.53007

37
286.4381
10.8498

38
−46.9919
1.8000
1.95375
32.32
0.59015

39
54.2501
7.9488
1.84666
23.83
0.61603

40
−45.8449
0.2577

41
−49.2346
1.8305
1.80100
34.97
0.58642

42
45.4781
8.0001
1.80400
46.58
0.55730

43
−89.8875
0.1849

44
377.4389
4.9915
1.57135
52.95
0.55544

45
−154.4243
14.2327

46
186.3239
4.9508
1.58267
46.42
0.56716

47
−95.3723
5.4549

48
144.8648
1.8002
1.95375
32.32
0.59015

49
45.1508
0.3951

50
44.2996
8.0066
1.51633
64.14
0.53531

51
−70.4722
0.1425

52
65.0540
6.2761
1.48749
70.24
0.53007

53
−59.8318
1.8002
1.95375
32.32
0.59015

54
−463.5944
0.2500

55
∞
1.0000
1.51633
64.14
0.53531

56
∞
0.0000

57
∞
33.0000
1.60863
46.60
0.56787

58
∞
13.2000
1.51633
64.14
0.53531

59
∞
17.3431

TABLE 30

Example 8 - Specifications (d-line)

Wide Angle End
Middle
Telephoto End

Zoom
1.0
48.0
77.0

Magnification

f′
9.23
443.00
710.64

Bf′
47.47
47.47
47.47

FNo.
1.76
2.28
3.66

2ω[°]
65.6
1.4
0.8

TABLE 31

Example 8 - Distances with respect to Zoom

Wide Angle End
Middle
Telephoto End

DD[10]
3.4238
181.0344
185.5983

DD[20]
284.5381
25.8471
3.9765

DD[22]
1.2485
5.8275
1.4969

DD[30]
2.6912
79.1928
100.8300

TABLE 32

Example 8 - Aspheric Coefficients

Surface No.

11
22
26

KA
1.0000000E+00
1.0000000E+00
1.0000000E+00

A3
−1.8734223E−21
−9.4994419E−23
−1.9744504E−22

A4
4.0377651E−07
2.5885178E−08
−3.7276810E−07

A5
2.8838804E−08
8.1208148E−09
−7.1416960E−09

A6
−2.3778998E−09
−4.4404402E−10
6.1323910E−10

A7
−1.3752036E−10
−1.1642324E−11
−4.5003167E−12

A8
3.3235604E−11
2.2808889E−12
−1.8306327E−12

A9
−1.1806499E−12
−3.8082037E−14
7.2409382E−14

A10
−1.1119723E−13
−4.3094590E−15
1.7877810E−15

A11
8.8174734E−15
1.5931457E−16
−1.4970490E−16

A12
9.1414991E−17
3.2617744E−18
4.0269046E−19

A13
−2.4438511E−17
−2.2129774E−19
1.3563698E−19

A14
2.8333842E−19
−9.8414232E−23
−1.9299794E−21

A15
3.4151692E−20
1.4709791E−22
−5.7156780E−23

A16
−7.6652516E−22
−1.2247393E−24
1.3194211E−24

A17
−2.3926906E−23
−4.6409036E−26
8.4439905E−27

A18
7.0330122E−25
6.1748066E−28
−3.3787964E−28

A19
6.6810099E−27
5.3374486E−30
3.6923088E−31

A20
−2.3184109E−28
−8.8908536E−32
2.2335912E−32

Next, a zoom lens of Example 9 is described. FIG. 17 is a sectional view illustrating the lens configuration of the zoom lens of Example 9, and FIG. 18 is a diagram showing optical paths through the zoom lens. The zoom lens of Example 9 is formed by the same number of lenses as the zoom lens of Example 6. Table 33 shows basic lens data of the zoom lens of Example 9, Table 34 shows data about specifications of the zoom lens, Table 35 shows data about surface distances to be changed of the zoom lens, Table 36 shows data about aspheric coefficients of the zoom lens, and FIG. 27 shows aberration diagrams of the zoom lens.

TABLE 33

Example 9 - Lens Data

Surface
Radius of
Surface

No.
Curvature
Distance
nd
νd
θg, F

1
1404.7647
4.4000
1.83400
37.16
0.57759

2
331.7428
2.0290

3
330.6824
25.1725
1.43387
95.18
0.53733

4
−684.6165
32.8963

5
332.8725
15.4555
1.43387
95.18
0.53733

6
3192.0621
0.1200

7
330.0570
18.0043
1.43387
95.18
0.53733

8
−4225.7159
2.9113

9
173.7787
13.4351
1.43875
94.66
0.53402

10
294.8116
DD[10]

*11
3646.4256
2.8000
1.91082
35.25
0.58224

12
54.3093
7.3207

13
−83.4371
1.6000
2.00100
29.13
0.59952

14
337.9217
4.5408

15
−62.1882
1.6000
1.95375
32.32
0.59015

16
128.3598
6.5865
1.89286
20.36
0.63944

17
−75.9599
0.1200

18
629.8856
9.4791
1.79504
28.69
0.60656

19
−42.5230
1.6200
1.77250
49.60
0.55212

20
2233.5230
DD[20]

21
185.1580
9.3099
1.49700
81.54
0.53748

*22
−216.7260
DD[22]

23
135.0164
14.0074
1.43875
94.66
0.53402

24
−170.1053
2.0000
1.59270
35.31
0.59336

25
−547.0734
0.2500

*26
212.2662
8.7456
1.43875
94.66
0.53402

27
−201.9044
0.1200

28
255.6587
2.0000
1.80000
29.84
0.60178

29
100.2233
14.6056
1.43875
94.66
0.53402

30
−192.7222
DD[30]

31 (stop)
∞
4.4530

32
−327.4803
1.5000
1.72916
54.68
0.54451

33
69.9336
0.1200

34
45.9379
5.2438
1.84661
23.88
0.62072

35
80.2736
3.2540

36
−136.5718
1.5000
1.48749
70.24
0.53007

37
172.9017
9.6930

38
−48.1573
1.5996
1.95375
32.32
0.59015

39
64.0378
7.9580
1.84661
23.88
0.62072

40
−45.9067
0.2385

41
−49.7226
1.8719
1.80100
34.97
0.58642

42
50.1721
8.9651
1.80400
46.58
0.55730

43
−90.0272
0.1198

44
379.5125
11.4833
1.51742
52.43
0.55649

45
−145.3944
6.4985

46
185.6172
4.7307
1.54814
45.78
0.56859

47
−90.8051
5.4933

48
144.8094
1.4061
1.95375
32.32
0.59015

49
44.8523
2.4761

50
45.7750
6.4411
1.51633
64.14
0.53531

51
−73.1882
0.1199

52
61.3330
5.4690
1.48749
70.24
0.53007

53
−58.5284
1.3999
1.95375
32.32
0.59015

54
−429.0874
0.2500

55
∞
1.0000
1.51633
64.14
0.53531

56
∞
0.0000

57
∞
33.0000
1.60863
46.60
0.56787

58
∞
13.2000
1.51633
64.14
0.53531

59
∞
13.9324

TABLE 34

Example 9 - Specifications (d-line)

Wide Angle End
Middle
Telephoto End

Zoom
1.0
48.0
77.0

Magnification

f′
9.30
446.43
716.14

Bf′
44.06
44.06
44.06

FNo.
1.76
2.27
3.63

2ω[°]
65.0
1.4
0.8

TABLE 35

Example 9 - Distances with respect to Zoom

Wide Angle End
Middle
Telephoto End

DD[10]
4.1494
191.9872
196.6227

DD[20]
296.5791
26.5197
3.9711

DD[22]
1.5430
6.4538
1.2477

DD[30]
2.3959
79.7067
102.8260

TABLE 36

Example 9 - Aspheric Coefficients

Surface No.

11
22
26

KA
1.0000000E+00
1.0000000E+00
1.0000000E+00

A3
2.7541588E−22
−8.9652271E−22
6.6507804E−22

A4
2.2200270E−07
1.5442509E−07
−2.6398668E−07

A5
3.6655960E−09
−5.7414857E−09
−1.0060099E−08

A6
3.5909489E−11
1.4641121E−10
3.5807861E−10

A7
−1.9924682E−11
1.9156089E−12
−2.2883080E−12

A8
7.9185956E−13
−9.8085610E−14
−1.3269105E−13

A9
−5.7638394E−15
5.8482396E−16
2.9778250E−15

A10
−1.5115490E−16
5.8511099E−18
−1.8171297E−17

Table 37 shows values corresponding to the condition expressions (1) to (4) of the zoom lenses of Examples 1 to 9. In all the examples, the d-line is used as a reference wavelength, and the values shown in Table 37 below are with respect to the reference wavelength.

TABLE 37

No.
Condition Expression
Example 1
Example 2
Example 3
Example 4
Example 5

(1)
νdG34n
29.84
32.58
32.42
34.29
32.58

(2)
ndL11
1.83400
1.83400
1.83400
1.83400
1.83400

(3)
νdL11
37.16
37.34
37.16
37.16
37.16

(4)
νd21
31.32
31.32
25.46
25.46
31.32

No.
Condition Expression
Example 6
Example 7
Example 8
Example 9

(1)
νdG34n
32.58
32.58
32.58
32.58

(2)
ndL11
1.83400
1.83400
1.83400
1.83400

(3)
νdL11
37.16
37.16
37.16
37.16

(4)
νd21
31.31
32.32
31.31
35.25

As can be seen from the above-described data, all the zoom lenses of Examples 1 to 9 satisfy the condition expressions (1) to (4), and are compact, and have high optical performance, a high magnification of 77× or more, and a wide angle of view with a total angle of view of at least 65° at the wide-angle end.

Next, an imaging apparatus according to an embodiment of the invention is described. FIG. 28 is a diagram illustrating the schematic configuration of an imaging apparatus employing the zoom lens of the embodiment of the invention, which is one example of the imaging apparatus of the embodiment of the invention. It should be noted that the lens groups are schematically shown in FIG. 28. Examples of the imaging apparatus may include a video camera and an electronic still camera which include a solid-state image sensor, such as a CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor), serving as a recording medium.

The imaging apparatus 10 shown in FIG. 28 includes a zoom lens 1; a filter 6 having a function of a low-pass filter, etc., disposed on the image plane side of the zoom lens 1; an image sensor 7 disposed on the image plane side of the filter 6; and a signal processing circuit 8. The image sensor 7 converts an optical image formed by the zoom lens 1 into an electric signal. As the image sensor 7, a CCD or a CMOS, for example, may be used. The image sensor 7 is disposed such that the imaging surface thereof is positioned in the same position as the image plane of the zoom lens 1.

An image taken through the zoom lens 1 is formed on the imaging surface of the image sensor 7. Then, a signal about the image outputted from the image sensor 7 is processed by the signal processing circuit 8, and the image is displayed on a display unit 9.

The present invention has been described with reference to the embodiments and the examples. However, the invention is not limited to the above-described embodiments and examples, and various modifications may be made to the invention. For example, the values of the radius of curvature, the surface distance, the refractive index, the Abbe number, etc., of each lens element are not limited to the values shown in the above-described numerical examples and may take different values.

Number	Date	Country	Kind
117373/2014	Jun 2014	JP	national
045035/2015	Mar 2015	JP	national

ZOOM LENS AND IMAGING APPARATUS

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