CN109960023A

CN109960023A - Zoom lens and photographic device

Info

Publication number: CN109960023A
Application number: CN201811123285.2A
Authority: CN
Inventors: 濑川敏也; 田口博规
Original assignee: Tamron Co Ltd
Current assignee: Tamron Co Ltd
Priority date: 2017-12-22
Filing date: 2018-09-26
Publication date: 2019-07-02
Anticipated expiration: 2038-09-26
Also published as: JP2019113700A; CN109960023B; JP6840661B2

Abstract

The present invention discloses a kind of zoom ratio with higher, and is able to maintain that in entire zoom area good optical property, small-sized and high performance zoom lens.The zoom lens are configured to, and are configured in order from object side: the 1st lens group (G with negative refractive power₁), the 2nd lens group (G with positive refractive power₂), the 3rd lens group (G with negative refractive power₃) and subsequent lens group (G_R).The zoom lens are being always maintained at the 1st lens group (G when carrying out the zoom from wide-angle side to telescope end₁) relative to image planes IMG it is fixed in the state of, at least make the 2nd lens group (G₂) and the 3rd lens group (G₃) moved along optical axis, to change interval of each lens group on optical axis.Also, by meeting predetermined condition, zoom ratio with higher is realized, and is able to maintain that in entire zoom area good optical property, small-sized and high performance zoom lens.

Description

Zoom lens and photographic device

Technical field

The present invention relates to zoom lens and photographic device, more particularly, to suitable for equipped with solid-state image pickups such as CCD and CMOS The zoom lens of the photographic device of element and photographic device with the zoom lens.

Background technique

It is solid equipped with CCD such as single-lens reflex camera, digital still camera, video camera, monitor camera and COMS etc. The photographic device of body photographing element is just in rapid proliferation.It is accompanied by this, proposing one kind can be applied to equipped with CCD and CMOS Deng solid-state imager photographic device in zoom lens (referring for example to patent document 1).

Zoom lens disclosed in patent document 1 are following optical systems: from object side, successively by the 1st of negative refractive power the Lens group, the 2nd lens group of positive refractive power, the 3rd lens group, the 4th lens group of positive or negative refractive power, Yi Jizheng of negative refractive power 5th lens group of refractive power is constituted, and by fixing the 1st lens group and the 5th lens group relative to imaging surface, and is made the 2nd thoroughly Microscope group, the 3rd lens group and the 4th lens group are mobile, to carry out the zoom from wide-angle side to telescope end.

Existing technical literature

Patent document

Patent document 1: No. 3226297 bulletins of Japanese Patent Publication No.

As the zoom lens of monitor camera, preferably high magnification heavy caliber zoom lens always, but in recent years, Due to the development of the high pixelation of solid-state image pickup element, to the high-resolution with the subtleer feature that can confirm subject The expectation of the lens of (high-performance) is higher and higher.It is accompanied by this, tight demand is on the basis for the high performance for realizing optical system On, realize the zoom lens of miniaturization, further high zoom and low cost.

However, although zoom lens disclosed in patent document 1 are wide-angles, but zoom ratio is down to 4 times or so, therefore can not fill Divide the needs of meeting in recent years.

Summary of the invention

In order to eliminate above-mentioned problem of the prior art point, it is an advantage of the invention to provide zooms with higher Than, and it is able to maintain that in entire zoom area good optical property, small-sized and high performance zoom lens.The present invention Another purpose be, zoom ratio with higher, small-sized and high performance zoom lens photographic device are provided.

In order to solve the above problems, to achieve the goal, zoom lens of the invention are characterized in that, which is By configured in order from object side the 1st lens group with negative refractive power, the 2nd lens group with positive refractive power, have it is negative What the 3rd lens group and subsequent lens group of refractive power were constituted, wherein by be always maintained at the 1st lens group relative to In the state that image planes are fixed, move the 2nd lens group and the 3rd lens group along optical axis, to change described each Thus interval of the lens group on optical axis carries out the zoom from wide-angle side to telescope end, also, zoom lens satisfaction is as follows Shown in conditional:

(1)3.5≦|F1/Fw|≦20.0

(2)0.7≦|F1/Ft|≦2.0

(3)1.9≦|F2/F3|≦5.0

Wherein, F1 indicates the focal length of the 1st lens group, Fw indicate the zoom lens wide-angle side focus away from From Ft indicates the zoom lens in the focal length of telescope end, and F2 indicates that the focal length of the 2nd lens group, F3 indicate institute State the focal length of the 3rd lens group.

According to the present invention it is possible to provide a kind of zoom ratio with higher, and it is able to maintain that in entire zoom area Good optical property, small-sized and high performance zoom lens.

Beneficial effects of the present invention are as follows:

According to the present invention it is possible to play following effect: being capable of providing zoom ratio with higher, and in entire zoom area Good optical property, small-sized and high performance zoom lens are able to maintain that in domain.Furthermore it is also possible to play following effect: It is capable of providing zoom ratio with higher, small-sized and high performance zoom lens photographic device.

Detailed description of the invention

Fig. 1 illustrates that the sectional view along optical axis of the structure of the zoom lens of embodiment 1.

Fig. 2 shows the various aberration diagrams of the zoom lens of embodiment 1.

Fig. 3 illustrates that the sectional view along optical axis of the structure of the zoom lens of embodiment 2.

Fig. 4 shows the various aberration diagrams of the zoom lens of embodiment 2.

Fig. 5 illustrates that the sectional view along optical axis of the structure of the zoom lens of embodiment 3.

Fig. 6 shows the various aberration diagrams of the zoom lens of embodiment 3.

Fig. 7 illustrates that the sectional view along optical axis of the structure of the zoom lens of embodiment 4.

Fig. 8 shows the various aberration diagrams of the zoom lens of embodiment 4.

Fig. 9 illustrates that the figure of an example of the photographic device with zoom lens of the invention.

Specific embodiment

Hereinafter, the ideal embodiment of zoom lens and photographic device of the invention is described in detail.

Zoom lens of the invention be by configured in order from object side the 1st lens group with negative refractive power, have What the 2nd lens group, the 3rd lens group with negative refractive power and the subsequent lens group of positive refractive power were constituted.Also, from wide-angle It holds the zoom of telescope end to carry out in the following way: being always maintained at the 1st lens group state fixed relative to image planes Under, move the 2nd lens group and the 3rd lens group along optical axis, to change interval of each lens group on optical axis.

In zoom lens of the invention, the 2nd lens group and the 3rd lens group take on zoom effect.When zooming, by making 2nd lens group and the 3rd lens group move together, and it is good can to change progress to the focus movement generated when zooming and aberration Correction, so as to realize with high-resolution varifocal optical system.In addition to this, when zooming, by the 1st lens group It is fixed, optical system overall length can be maintained shorter, so as to realize small-sized optical system.In addition, due to the 1st The outer diameter of lens group is larger to have the tendency that as ponderable lens group, therefore when zooming, by the way that it is fixed, It can be realized the simplification of the driving mechanism of optical system.By doing so, the aberration correction in entire zoom area becomes It is easy, and the small-sized zoom lens with good optical property may be implemented.

Also, in zoom lens of the invention, in view of the high pixelation of solid-state image pickup element, in order to realize that have can be true The high-resolution lens for recognizing the more fine feature of subject set various conditions as follows.

Firstly, zoom lens of the invention the focal length of the 1st lens group is set as F1, by the zoom lens in wide-angle When the focal length at end is set as Fw, preferably satisfy the following conditional expression.

(1)3.5≦|F1/Fw|≦20.0

Conditional (1) be define the 1st lens group focal length and the zoom lens wide-angle side focal length it Between ratio formula.By meeting conditional (1), high zoom ratios can be realized in wide-angle side, and remain good optical Energy.

In conditional (1), when being less than its lower limit, the refractive power of the 1st lens group is become too strong, to be difficult to carry out picture The correction of field bend, astigmatism, therefore it is unable to maintain that good optical property.On the other hand, in conditional (1), when greater than it When the upper limit, the refractive power of the 1st lens group is become too weak, to realize high zoom ratios it is necessary to make the 2nd lens group when zooming and The amount of movement of 3rd lens group increases, so that optical system overall length extends, therefore, it is difficult to realize the miniaturization of optical system.In addition, When being responsible for the increase of the amount of movement of lens group of zoom, the focus generated when zooming is mobile and aberration becomes larger, therefore light Learn penalty.

In addition, the lower limit value of the above conditions (1) can mode as following set: preferably 5.0 with On, more preferably 6.0 or more, more preferably 7.0 or more, more preferably 8.0 or more, more preferably 8.5 or more, more preferably More than 8.9.In addition, the upper limit value of the above conditions (1) can mode as following set: preferably 19.0 with Under, more preferably 18.0 hereinafter, more preferably 17.0 hereinafter, more preferably 16.0 hereinafter, more preferably 15.5 hereinafter, more preferably It is 15.0 or less.

Then, when the focal length by the zoom lens in telescope end is set as Ft, the focal length of the 2nd lens group is set as When F2, preferably satisfy the following conditional expression.

(2)0.7≦|F1/Ft|≦2.0

Conditional (2) be define the 1st lens group focal length and the zoom lens telescope end focal length it Between ratio formula.By meeting conditional (2), high zoom ratios can be realized in telescope end, and remain good optical Energy.

In conditional (2), when being less than its lower limit, the refractive power of the 1st lens group is become too strong, to be difficult to carry out picture The correction of field bend, astigmatism, therefore it is unable to maintain that good optical property.On the other hand, in conditional (2), when greater than it When the upper limit, the refractive power of the 1st lens group is become too weak, to realize high zoom ratios it is necessary to make the 2nd lens group when zooming and The amount of movement of 3rd lens group increases, so that optical system overall length extends, therefore, it is difficult to realize the miniaturization of optical system.In addition, When being responsible for the increase of the amount of movement of lens group of zoom, the focus generated when zooming is mobile and aberration becomes larger, therefore light Learn penalty.

In addition, the lower limit value of the above conditions (2) can mode as following set: preferably 0.74 with On, more preferably 0.78 or more.In addition, the upper limit value of the above conditions (2) can mode as following set: Preferably 1.8 hereinafter, more preferably 1.4 or less.

In addition, the focal length of the 3rd lens group is set as when the focal length by the zoom lens in telescope end is set as Ft When F3, preferably satisfy the following conditional expression.

(3)1.9≦|F2/F3|≦5.0

Conditional (3) is the public affairs for defining the ratio between the focal length of the 2nd lens group and the focal length of the 3rd lens group Formula.It, can be real reducing the amount of movement of the 2nd lens group when zooming and the 3rd lens group by meeting conditional (3) Existing high zoom ratios.As a result, it is suppressed that the focus generated when zooming is mobile and aberration changes so as to remain good Optical property, also, optical system overall length is maintained into obtain the shorter miniaturization so as to realize optical system.

In conditional (3), when being less than its lower limit, compared to the 3rd lens group, the refractive power variable of the 2nd lens group obtains mistake By force, thus be difficult to carry out in entire zoom area spherical aberration, on axis color difference correction, therefore be unable to maintain that good optics Performance.On the other hand, in conditional (3), when prescribing a time limit thereon greatly, compared with the 2nd lens group, the refractive power of the 3rd lens group It become too strong, to be difficult to carry out the correction of filed curvature, astigmatism in entire zoom area, therefore is unable to maintain that good light Learn performance.

In addition, the lower limit value of the above conditions (3) can mode as following set: preferably 2.0 with On, more preferably 2.5 or more.In addition, the upper limit value of the above conditions (3) can mode as following set: Preferably 4.5 hereinafter, more preferably 4.0 hereinafter, more preferably 3.6 or less.

By meeting each conditional, above-mentioned effect can be played.It, can be with also, by meeting conditional (1)~(3) It realizes zoom ratio with higher, also, is able to maintain that in entire zoom area good optical property, small-sized and high property The zoom lens of energy.

It, will when the 3rd lens group is set as β 3t in the lateral magnification of telescope end also, in zoom lens of the invention 3rd lens group is preferably satisfied the following conditional expression when the lateral magnification of wide-angle side is set as β 3w.

(4)3.0≦|β3t/β3w|≦9.0

Conditional (4) be define the 3rd lens group in the formula of the ratio of the lateral magnification of wide-angle side and telescope end, and Show the ratio of the zoom of the 3rd lens group.By meeting conditional (4), though reduce the 2nd lens group when zooming and The amount of movement of 3rd lens group also can be realized high zoom ratios.As a result, it is suppressed that the focus movement generated when zooming and picture Difference changes to maintain good optical property, also, maintains shorter so as to realizing light by optical system overall length The miniaturization of system.

In conditional (4), when being less than its lower limit, since the ratio of the zoom of the 3rd lens group reduces, it is therefore necessary to increase The ratio of the zoom of the other lenses group of big responsible zoom, so that the amount of movement for being responsible for the other lenses group of zoom increases.It is tied Fruit is, it is difficult to realize the miniaturization of optical system.On the other hand, in conditional (4), when prescribing a time limit thereon greatly, the 3rd lens group The ratio of zoom increase, be difficult to carry out the correction of filed curvature, astigmatism in entire zoom area, therefore be unable to maintain that good Optical property.

In addition, the lower limit value of the above conditions (4) can mode as following set: preferably 3.2 with On, more preferably 3.4 or more.In addition, the upper limit value of the above conditions (4) can mode as following set: Preferably 8.0 hereinafter, more preferably 7.0 hereinafter, more preferably 6.5 hereinafter, more preferably 6.0 hereinafter, more preferably 5.5 with Under, more preferably 5.0 or less.

Also, in zoom lens of the invention, preferably the subsequent lens group is configured to include from object side Act configure in order, the 4th lens group with positive refractive power and the 5th lens group with positive refractive power.

And, it is preferred that when carrying out zoom, make any one in the 4th lens group or the 5th lens group along light Axis is mobile.At this point, when the movable group in subsequent lens group is set as β pt in the lateral magnification of telescope end, by subsequent lens group In movable group when the lateral magnification of wide-angle side is set as β pw, preferably satisfy the following conditional expression.

(5)3.0≦|βpt/βpw|≦10.0

Conditional (5) is to define the movable group in subsequent lens group in the ratio of the lateral magnification of wide-angle side and telescope end Formula, and show the ratio of the zoom of the movable group.By meeting conditional (5), both inhibited when zooming can The amount of movement of dynamic group, and can be realized high zoom ratios.As a result, it is suppressed that the focus generated when zooming is mobile and aberration becomes It is dynamic so as to maintain good optical property, also, optical system overall length is maintained shorter so as to realizing optical system The miniaturization of system.

In conditional (5), when being less than its lower limit, since the ratio of the zoom of the movable group in subsequent lens group subtracts It is small, it is therefore necessary to increase the ratio for being responsible for the zoom of other lenses group of zoom, to be responsible for the shifting of the other lenses group of zoom Momentum increases.As a result, especially when wanting to realize high zoom ratios, it is difficult to realize the miniaturization of optical system.Another party Face, in conditional (5), when prescribing a time limit thereon greatly, the ratio of the zoom of the movable group in subsequent lens group increases, thus whole It is difficult to carry out the correction of filed curvature, astigmatism in a zoom area, therefore is unable to maintain that good optical property.

In addition, the lower limit value of the above conditions (5) can mode as following set: preferably 3.4 with On, more preferably 3.9 or more.In addition, the upper limit value of the above conditions (5) can mode as following set: Preferably 9.0 hereinafter, more preferably 8.0 hereinafter, more preferably 7.0 hereinafter, more preferably 6.7 hereinafter, more preferably 6.2 with Under.

It is further preferred, that when carrying out zoom, in the lens group that includes in subsequent lens group, the 4th lens group or Any one lens group in 5th lens group is movable group.By the way that any one lens group is set as movable group, zoom can be made Mechanism simplifying, so as to realize the miniaturization of optical system.In addition, being the feelings being made of 2 lens groups in subsequent lens group Under condition, the 4th lens group can be, any one in the 5th lens group is movable group.It is by 3 or more in subsequent lens group Lens group is constituted, and the lens group (the 6th lens group) configured in the image side of the 5th lens is fixed on optical axis when zooming In the case of, it is preferred that the 5th lens group is set as movable group, the 4th lens group is fixed on when zooming on optical axis, is being configured In the case where the lens group (the 6th lens group) of the image side of the 5th lens is movable when zooming, can be the 4th lens group or Any one in 5th lens group is movable group.

Also, in zoom lens of the invention, it is preferred that the 1st lens group is made of 1 lens.Due to the 1st lens The outer diameter of group has bigger tendency, therefore by constituting the 1st lens group by 1 lens, can be realized the light weight of the 1st lens group Change, also, by the 1st lens group is thinning and maintain shorter by optical system overall length, can be realized the small of optical system Type.In addition, the mechanism for keeping the 1st lens group can be simplified since the 1st lens group is made of 1 lens. The lens for constituting the 1st lens group have negative refractive power, and shape can be meniscus shape, be also possible to bi-concave shape.However, To generate stronger negative refractive power, preferably bi-concave shape.

Also, in zoom lens of the invention, it is preferred that in subsequent lens group, the 5th lens group image planes side Configured with the 6th lens group with positive refractive power.By doing so, can to by before the 5th lens group without complete school Correction is effectively performed in the various aberrations of filed curvature just etc., and can be realized in entire zoom area with higher The zoom lens of resolution ratio.

Also, in zoom lens of the invention, it is preferred that when carrying out the zoom from wide-angle side to telescope end, the 1st Lens group and being spaced at the intermediate region of zoom for the 2nd lens group reach maximum.Here, the intermediate region of zoom refers to from wide Angle end is also possible to the arbitrary focal length other than wide-angle side and telescope end to the region of the zoom midway of telescope end. By the configuration of lens group when taking such zoom, it can be realized high zoom ratios.

Also, in zoom lens of the invention, it is preferred that aperture is configured in the 4th lens group.Also, work as light It is excellent in the case that circle moves together with the 4th lens group when zooming or the 4th lens group is fixed on optical axis when zooming Choosing, aperture slot are fixed.Here, aperture is configured in the 4th lens group and refers to, aperture is configured in the 4th lens group In any one in object side, image side or the lens that are configured in the 4th lens group, if it is along optical axis direction with 4th lens group moves together or fixed structure, then the position being configured is not particularly limited.By the way that aperture configuration is existed In 4th lens group, aberration when being able to suppress zoom changes, so as to realize high performance.

Also, in zoom lens of the invention, it is preferred that the 3rd lens group is in the zoom from wide-angle side to telescope end When it is mobile to image side.By the configuration of lens group when taking such zoom, it can be realized high zoom ratios.

As described above, according to the present invention, by can be realized zoom with higher with above structure Than, and it is able to maintain that in entire zoom area good optical property, small-sized and high performance zoom lens.The zoom Lens be it is a kind of particularly suitable for the photographic device equipped with the solid-state imager for having carried out high pixelation, optical property it is higher Lens.

In addition, the object of the present invention is to provide zoom ratio with higher, small-sized and high performance zoom lens Photographic device.To realize the purpose, if photographic device is configured to include the zoom lens for having above structure, and The optical image formed by the zoom lens is converted to the solid-state imager of electric signal.By doing so, can be realized High-resolution photographic device.

Hereinafter, with reference to the accompanying drawings, the embodiment of zoom lens of the invention is described in detail.In addition, the present invention is not It is limited to embodiment below.

[embodiment 1]

Fig. 1 illustrates that the sectional view along optical axis of the structure of the zoom lens of embodiment 1.The zoom lens are configured To be configured in order from object side (not shown): the 1st lens group G with negative refractive power₁, the with positive refractive power 2nd thoroughly Microscope group G₂, the 3rd lens group G with positive refractive power₃And subsequent lens group G_R.In the 3rd lens group G₃With subsequent lens group G_RIt Between configured with defining the opening aperture STP of predetermined bore.In subsequent lens group G_RCover glass is configured between image planes IMG CG.Cover glass CG is configured as needed.

In addition, subsequent lens group G_RIt is configured to, is configured in order from object side: the 4th lens with positive refractive power Group G₄, the 5th lens group G with positive refractive power₅And the 6th lens group G with positive refractive power₆。

1st lens group G₁It is only by double-concave negative lens L₁₁It constitutes.

2nd lens group G₂It is configured to, is configured in order from object side: diverging meniscus lens of the convex surface towards object side L₂₁, biconvex positive lens L₂₂And biconvex positive lens L₂₃.Diverging meniscus lens L₂₁With biconvex positive lens L₂₂It engages.Biconvex just Lens L₂₃Two surfaces on formed it is aspherical.

3rd lens group G₃It is configured to, is configured in order from object side: double-concave negative lens L₃₁, double-concave negative lens L₃₂, it is double Convex positive lens L₃₃And convex surface is towards the diverging meniscus lens L of image side₃₄.In double-concave negative lens L₃₁Two surfaces on form aspheric Face.Biconvex positive lens L₃₃With diverging meniscus lens L₃₄It engages.

4th lens group G₄It is configured to, is configured in order from object side: biconvex positive lens L₄₁With convex surface towards image side Diverging meniscus lens L₄₂.Biconvex positive lens L₄₁With diverging meniscus lens L₄₂It engages.

5th lens group G₅It is configured to, is configured in order from object side: biconvex positive lens L₅₁, biconvex positive lens L₅₂, it is double Recessed negative lens L₅₃, biconvex positive lens L₅₄, convex surface towards object side diverging meniscus lens L₅₅, biconvex positive lens L₅₆And convex surface court To the diverging meniscus lens L of image side₅₇.In biconvex positive lens L₅₁Two surfaces on formed it is aspherical.Biconvex positive lens L₅₂, concave-concave Negative lens L₅₃And biconvex positive lens L₅₄It engages.Diverging meniscus lens L₅₅, biconvex positive lens L₅₆And diverging meniscus lens L₅₇ It engages.

6th lens group G₆It is configured to, is configured in order from object side: diverging meniscus lens L of the convex surface towards object side₆₁ With convex surface towards the positive meniscus lens L of object side₆₂。

The zoom lens are being always maintained at the 1st lens group G when carrying out the zoom from wide-angle side to telescope end₁, the 4th thoroughly Microscope group G₄And the 6th lens group G₆In the state of being fixed relative to image planes IMG, the 2nd lens group G₂Along optical axis in image planes IMG The mode that side forms convex track is mobile, the 3rd lens group G₃It is moved along optical axis from object side to the side image planes IMG dullness, the 5th thoroughly Microscope group G₅It is moved along optical axis from the side image planes IMG to object side dullness.

Hereinafter, showing various numeric datas relevant to the zoom lens of embodiment 1.

(surface data)

r₁=-258.600

d₁=1.300 nd₁=1.8042 ν d₁=46.50

r₂=39.170

d₂=D (2) (variable)

r₃=56.700

d₃=0.900 nd₂=1.8548 ν d₂=24.80

r₄=31.260

d₄=5.700 nd₃=1.4970 ν d₃=81.61

r₅=-79.000

d₅=0.150

r₆=30.850 (aspherical)

d₆=5.000 nd₄=1.6935 ν d₄=53.20

r₇=-96.512 (aspherical)

d₇=D (7) (variable)

r₈=-103.233 (aspherical)

d₈=0.600 nd₅=1.8514 ν d₅=40.10

r₉=10.784 (aspherical)

d₉=3.441

r₁₀=-10.850

d₁₀=0.600 nd₆=1.6385 ν d₆=55.45

r₁₁=186.000

d₁₁=0.176

r₁₂=76.800

d₁₂=2.310 nd₇=1.9229 ν d₇=20.88

r₁₃=-16.960

d₁₃=0.600 nd₈=1.7292 ν d₈=54.67

r₁₄=-88.880

d₁₄=D (14) (variable)

r₁₅=∞ (opening aperture)

d₁₅=0.600

r₁₆=39.720

d₁₆=4.210 nd₉=1.4970 ν d₉=81.61

r₁₇=-19.300

d₁₇=0.600 nd₁₀=1.8042 ν d₁₀=46.50

r₁₈=-40.040

d₁₈=D (18) (variable)

r₁₉=48.511 (aspherical)

d₁₉=3.200 nd₁₁=1.6935 ν d₁₁=53.20

r₂₀=-68.078 (aspherical)

d₂₀=0.150

r₂₁=15.300

d₂₁=7.440 nd₁₂=1.4970 ν d₁₂=81.61

r₂₂=-15.300

d₂₂=1.000 nd₁₃=1.8061 ν d₁₃=40.73

r₂₃=118.600

d₂₃=3.480 nd₁₄=1.8081 ν d₁₄=22.76

r₂₄=-30.260

d₂₄=0.150

r₂₅=26.300

d₂₅=1.000 nd₁₅=2.0010 ν d₁₅=29.13

r₂₆=8.672

d₂₆=5.290 nd₁₆=1.4970 ν d₁₆=81.61

r₂₇=-12.864

d₂₇=0.600 nd₁₇=1.6204 ν d₁₇=60.34

r₂₈=-49.000

d₂₈=D (28) (variable)

r₂₉=46.000

d₂₉=0.600 nd₁₈=1.9037 ν d₁₈=31.31

r₃₀=18.300

d₃₀=2.711

r₃₁=20.440

d₃₁=2.250 nd₁₉=1.6968 ν d₁₉=55.46

r₃₂=126.500

d₃₂=4.400

r₃₃=∞

d₃₃=1.000 nd₂₀=1.5163 ν d₂₀=64.14

r₃₄=∞

d₃₄=1.000

r₃₅=∞ (image planes)

Circular cone coefficient (k) and asphericity coefficient (A₄, A₆, A₈, A₁₀, A₁₂, A₁₄)

(the 6th face)

K=0,

A₄=-2.8400 × 10^-6, A₆=3.9875 × 10^-8,

A₈=-4.8993 × 10^-10, A₁₀=8.6640 × 10^-12,

A₁₂=-6.7380 × 10^-14, A₁₄=2.2082 × 10^-16

(the 7th face)

K=0,

A₄=3.3475 × 10^-7, A₆=1.0920 × 10^-8,

A₈=3.7294 × 10^-10, A₁₀=-1.5000 × 10^-12,

A₁₂=-1.2478 × 10^-14, A₁₄=1.1593 × 10^-16

(the 8th face)

K=0,

A₄=1.3969 × 10^-5, A₆=-1.3224 × 10^-7,

A₈=6.1860 × 10^-9, A₁₀=-1.0476 × 10^-10,

A₁₂=0, A₁₄=0

(the 9th face)

K=0,

A₄=4.9520 × 10^-6, A₆=-7.5303 × 10^-7,

A₈=5.6418 × 10^-8, A₁₀=-7.6164 × 10^-10,

A₁₂=0, A₁₄=0

(the 19th face)

K=0,

A₄=7.6863 × 10^-6, A₆=-1.0741 × 10^-8,

A₈=2.1915 × 10^-9, A₁₀=-1.7507 × 10^-11,

A₁₂=-1.2945 × 10^-14, A₁₄=0

(the 20th face)

K=0,

A₄=2.0382 × 10^-5, A₆=-8.9746 × 10^-8,

A₈=3.1841 × 10^-9, A₁₀=-3.1291 × 10^-11,

A₁₂=2.2543 × 10^-14, A₁₄=0

(various data)

(variable focus lens package data)

(the relevant numerical value of conditional (1))

| F1/Fw |=9.86

(the relevant numerical value of conditional (2))

| F1/Ft |=0.87

(the relevant numerical value of conditional (3))

| F2/F3 |=3.16

(the relevant numerical value of conditional (4))

β 3t (the 3rd lens group G₃In the lateral magnification of telescope end)=- 0.85

β 3w (the 3rd lens group G₃In the lateral magnification of wide-angle side)=- 0.24

| β 3t/ β 3w |=3.49

(the relevant numerical value of conditional (5))

β pt (movable group (the 5th lens group G in subsequent lens group₅) in the lateral magnification of telescope end)=- 0.86

β pw (movable group (the 5th lens group G in subsequent lens group₅) in the lateral magnification of wide-angle side)=- 0.14

| β pt/ β pw |=6.09

Fig. 2 shows the various aberration diagrams of the zoom lens of embodiment 1.In spherical aberration diagram, the longitudinal axis indicates F number (figure In indicated with FNO), solid line shows the characteristic for being equivalent to the wavelength of d line (587.56nm), and single dotted broken line, which is shown, is equivalent to C line The characteristic of the wavelength of (656.28nm), dotted line show the characteristic for being equivalent to the wavelength of F line (486.13nm).In astigmatism figure, indulge Axis indicates angle of half field-of view (indicating in figure with ω), and shows the characteristic for being equivalent to the wavelength of d line.In addition, in astigmatism figure, it is real Line shows the characteristic of sagittal plane (indicating in figure with S), and dotted line shows the characteristic of meridional plane (indicating in figure with M).It is distorting In aberration diagram, the longitudinal axis indicates angle of half field-of view (indicating in figure with ω), and shows the characteristic for being equivalent to the wavelength of d line.

[embodiment 2]

Fig. 3 illustrates that the sectional view along optical axis of the structure of the zoom lens of embodiment 2.The zoom of the present embodiment is saturating The movement of the optical texture of mirror and each lens group when zooming is identical as zoom lens shown in embodiment 1.Therefore, in this reality It applies in example, identical label is added to component same as Example 1, and omit the detailed description about them.

Hereinafter, the relevant various numeric datas of the zoom lens for showing embodiment 2.

(surface data)

r₁=-128.642

d₁=1.300 nd₁=1.8042 ν d₁=46.50

r₂=86.633

d₂=D (2) (variable)

r₃=97.555

d₃=0.900 nd₂=1.8548 ν d₂=24.80

r₄=40.754

d₄=5.700 nd₃=1.4970 ν d₃=81.61

r₅=-81.000

d₅=0.150

r₆=33.462 (aspherical)

d₆=5.000 nd₄=1.6935 ν d₄=53.20

r₇=-105.004 (aspherical)

d₇=D (7) (variable)

r₈=-184.258 (aspherical)

d₈=0.600 nd₅=1.8514 ν d₅=40.10

r₉=9.660 (aspherical)

d₉=3.441

r₁₀=-12.151

d₁₀=0.600 nd₆=1.6385 ν d₆=55.45

r₁₁=67.822

d₁₁=0.176

r₁₂=40.190

d₁₂=2.310 nd₇=1.9229 ν d₇=20.88

r₁₃=-21.037

d₁₃=0.600 nd₈=1.7292 ν d₈=54.67

r₁₄=-106.143

d₁₄=D (14) (variable)

r₁₅=∞ (opening aperture)

d₁₅=0.600

r₁₆=35.038

d₁₆=4.210 nd₉=1.4970 ν d₉=81.61

r₁₇=-22.407

d₁₇=0.600 nd₁₀=1.8042 ν d₁₀=46.50

r₁₈=-67.185

d₁₈=D (18) (variable)

r₁₉=39.835 (aspherical)

d₁₉=3.200 nd₁₁=1.6935 ν d₁₁=53.20

r₂₀=-80.656 (aspherical)

d₂₀=0.150

r₂₁=15.683

d₂₁=7.440 nd₁₂=1.4970 ν d₁₂=81.61

r₂₂=-15.929

d₂₂=1.000 nd₁₃=1.8061 ν d₁₃=40.73

r₂₃=115.784

d₂₃=3.480 nd₁₄=1.8081 ν d₁₄=22.76

r₂₄=-31.156

d₂₄=0.150

r₂₅=24.351

d₂₅=1.000 nd₁₅=2.0010 ν d₁₅=29.13

r₂₆=8.639

d₂₆=5.290 nd₁₆=1.4970 ν d₁₆=81.61

r₂₇=-13.086

d₂₇=0.600 nd₁₇=1.6204 ν d₁₇=60.34

r₂₈=-43.515

d₂₈=D (28) (variable)

r₂₉=15.050

d₂₉=0.600 nd₁₈=1.9037 ν d₁₈=31.31

r₃₀=9.741

d₃₀=2.711

r₃₁=15.775

d₃₁=2.250 nd₁₉=1.6968 ν d₁₉=55.46

r₃₂=50.681

d₃₂=4.400

r₃₃=∞

d₃₃=1.000 nd₂₀=1.5163 ν d₂₀=64.14

r₃₄=∞

d₃₄=1.000

r₃₅=∞ (image planes)

(the 6th face)

K=0,

A₄=-2.7204 × 10^-6, A₆=4.0454 × 10^-8,

A₈=-4.6815 × 10^-10, A₁₀=8.5225 × 10^-12,

A₁₂=-6.9515 × 10^-14, A₁₄=2.2082 × 10^-16

(the 7th face)

K=0,

A₄=1.0655 × 10^-6, A₆=1.5711 × 10^-8,

A₈=3.6582 × 10^-10, A₁₀=-1.8761 × 10^-12,

A₁₂=-1.3073 × 10^-14, A₁₄=1.1593 × 10^-16

(the 8th face)

K=0,

A₄=-2.3816 × 10^-7, A₆=-2.2000 × 10^-7,

A₈=8.6543 × 10^-9, A₁₀=-1.1481 × 10^-10,

A₁₂=0, A₁₄=0

(the 9th face)

K=0,

A₄=-2.4723 × 10^-5, A₆=-1.7377 × 10^-6,

A₈=7.4493 × 10^-8, A₁₀=-1.1663 × 10^-9,

A₁₂=0, A₁₄=0

(the 19th face)

K=0,

A₄=4.9385 × 10^-6, A₆=-1.2067 × 10^-8,

A₈=2.2353 × 10^-9, A₁₀=-1.8036 × 10^-11,

A₁₂=-1.2945 × 10^-14, A₁₄=0

(the 20th face)

K=0,

A₄=2.2832 × 10^-5, A₆=-8.0148 × 10^-8,

A₈=3.1887 × 10^-9, A₁₀=-3.1279 × 10^-11,

A₁₂=2.2543 × 10^-14, A₁₄=0

(various data)

(variable focus lens package data)

(the relevant numerical value of conditional (1))

| F1/Fw |=15.00

(the relevant numerical value of conditional (2))

| F1/Ft |=1.33

(the relevant numerical value of conditional (3))

| F2/F3 |=3.57

(the relevant numerical value of conditional (4))

β 3t (the 3rd lens group G₃In the lateral magnification of telescope end)=- 0.88

| β 3t/ β 3w |=3.66

(the relevant numerical value of conditional (5))

β pt (movable group (the 5th lens group G in subsequent lens group₅) in the lateral magnification of telescope end)=- 0.91

β pw (movable group (the 5th lens group G in subsequent lens group₅) in the lateral magnification of wide-angle side)=- 0.21

| β pt/ β pw |=4.33

Fig. 4 shows the various aberration diagrams of the zoom lens of embodiment 2.In spherical aberration diagram, the longitudinal axis indicates F number (figure In indicated with FNO), solid line shows the characteristic for being equivalent to the wavelength of d line (587.56nm), and single dotted broken line, which is shown, is equivalent to C line The characteristic of the wavelength of (656.28nm), dotted line show the characteristic for being equivalent to the wavelength of F line (486.13nm).In astigmatism figure, indulge Axis indicates angle of half field-of view (indicating in figure with ω), and shows the characteristic for being equivalent to the wavelength of d line.In addition, in astigmatism figure, it is real Line shows the characteristic of sagittal plane (indicating in figure with S), and dotted line shows the characteristic of meridional plane (indicating in figure with M).It is distorting In aberration diagram, the longitudinal axis indicates angle of half field-of view (indicating in figure with ω), and shows the characteristic for being equivalent to the wavelength of d line.

[embodiment 3]

Fig. 5 illustrates that the sectional view along optical axis of the structure of the zoom lens of embodiment 3.The zoom of the present embodiment is saturating The movement of the optical texture of mirror and each lens group when zooming is identical as zoom lens shown in embodiment 1.Therefore, in this reality It applies in example, identical label is added to component same as Example 1, and omit the detailed description about them.

Hereinafter, the relevant various numeric datas of the zoom lens for showing embodiment 3.

(surface data)

r₁=-106.965

d₁=1.300 nd₁=1.8042 ν d₁=46.50

r₂=43.788

d₂=D (2) (variable)

r₃=69.161

d₃=0.900 nd₂=1.8548 ν d₂=24.80

r₄=35.650

d₄=5.700 nd₃=1.4970 ν d₃=81.61

r₅=-64.651

d₅=0.150

r₆=34.803 (aspherical)

d₆=5.000 nd₄=1.6935 ν d₄=53.20

r₇=-69.145 (aspherical)

d₇=D (7) (variable)

r₈=-75.672 (aspherical)

d₈=0.600 nd₅=1.8514 ν d₅=40.10

r₉=11.109 (aspherical)

d₉=3.441

r₁₀=-11.051

d₁₀=0.600 nd₆=1.6385 ν d₆=55.45r₁₁=72.120

d₁₁=0.176

r₁₂=54.292

d₁₂=2.310 nd₇=1.9229 ν d₇=20.88

r₁₃=-21.981

d₁₃=0.600 nd₈=1.7292 ν d₈=54.67

r₁₄=-31.329

d₁₄=D (14) (variable)

r₁₅=∞ (opening aperture)

d₁₅=0.600

r₁₆=38.054

d₁₆=4.210 nd₉=1.4970 ν d₉=81.61

r₁₇=-30.804

d₁₇=0.600 nd₁₀=1.8042 ν d₁₀=46.50

r₁₈=-134.701

d₁₈=D (18) (variable)

r₁₉=36.618 (aspherical)

d₁₉=3.200 nd₁₁=1.6935 ν d₁₁=53.20

r₂₀=-102.581 (aspherical)

d₂₀=0.150

r₂₁=14.586

d₂₁=7.440 nd₁₂=1.4970 ν d₁₂=81.61

r₂₂=-16.933

d₂₂=1.000 nd₁₃=1.8061 ν d₁₃=40.73

r₂₃=70.311

d₂₃=3.480 nd₁₄=1.8081 ν d₁₄=22.76

r₂₄=-34.965

d₂₄=0.150

r₂₅=23.865

d₂₅=1.000 nd₁₅=2.0010 ν d₁₅=29.13

r₂₆=7.955

d₂₆=5.290 nd₁₆=1.4970 ν d₁₆=81.61

r₂₇=-15.619

d₂₇=0.600 nd₁₇=1.6204 ν d₁₇=60.34

r₂₈=-66.177

d₂₈=D (28) (variable)

r₂₉=13.302

d₂₉=0.600 nd₁₈=1.9037 ν d₁₈=31.31

r₃₀=10.303

d₃₀=2.711

r₃₁=23.890

d₃₁=2.250 nd₁₉=1.6968 ν d₁₉=55.46

r₃₂=78.008

d₃₂=4.400

r₃₃=∞

d₃₃=1.000 nd₂₀=1.5163 ν d₂₀=64.14

r₃₄=∞

d₃₄=1.000

r₃₅=∞ (image planes)

(the 6th face)

K=0,

A₄=-2.7204 × 10^-6, A₆=4.0454 × 10^-8,

A₈=-4.6815 × 10^-10, A₁₀=8.5225 × 10^-12,

A₁₂=-6.9515 × 10^-14, A₁₄=2.2082 × 10^-16

(the 7th face)

K=0,

A₄=1.0655 × 10^-6, A₆=1.5711 × 10^-8,

A₈=3.6582 × 10^-10, A₁₀=-1.8761 × 10^-12,

A₁₂=-1.3073 × 10^-14, A₁₄=1.1593 × 10^-16

(the 8th face)

K=0,

A₄=-2.3816 × 10^-7, A₆=-2.2000 × 10^-7,

A₈=8.6543 × 10^-9, A₁₀=-1.1481 × 10^-10,

A₁₂=0, A₁₄=0

(the 9th face)

K=0,

A₄=-2.4723 × 10^-5, A₆=-1.7377 × 10^-6,

A₈=7.4493 × 10^-8, A₁₀=-1.1663 × 10^-9,

A₁₂=0, A₁₄=0

(the 19th face)

K=0,

A₄=4.9385 × 10^-6, A₆=-1.2067 × 10^-8,

A₈=2.2353 × 10^-9, A₁₀=-1.8036 × 10^-11,

A₁₂=-1.2945 × 10^-14, A₁₄=0

(the 20th face)

K=0,

A₄=2.2832 × 10^-5, A₆=-8.0148 × 10^-8,

A₈=3.1887 × 10^-9, A₁₀=-3.1279 × 10^-11,

A₁₂=2.2543 × 10^-14, A₁₄=0

(various data)

(variable focus lens package data)

(the relevant numerical value of conditional (1))

| F1/Fw |=8.99

(the relevant numerical value of conditional (2))

| F1/Ft |=0.80

(the relevant numerical value of conditional (3))

| F2/F3 |=2.60

(the relevant numerical value of conditional (4))

β 3t (the 3rd lens group G₃In the lateral magnification of telescope end)=- 0.94

β 3w (the 3rd lens group G₃In the lateral magnification of wide-angle side)=- 0.26

| β 3t/ β 3w |=3.59

(the relevant numerical value of conditional (5))

β pt (movable group (the 5th lens group G in subsequent lens group₅) in the lateral magnification of telescope end)=- 0.96

β pw (movable group (the 5th lens group G in subsequent lens group₅) in the lateral magnification of wide-angle side)=- 0.24

| β pt/ β pw |=4.05

Fig. 6 shows the various aberration diagrams of the zoom lens of embodiment 3.In spherical aberration diagram, the longitudinal axis indicates F number (figure In indicated with FNO), solid line shows the characteristic for being equivalent to the wavelength of d line (587.56nm), and single dotted broken line, which is shown, is equivalent to C line The characteristic of the wavelength of (656.28nm), dotted line show the characteristic for being equivalent to the wavelength of F line (486.13nm).In astigmatism figure, indulge Axis indicates angle of half field-of view (indicating in figure with ω), and shows the characteristic for being equivalent to the wavelength of d line.In addition, in astigmatism figure, it is real Line shows the characteristic of sagittal plane (indicating in figure with S), and dotted line shows the characteristic of meridional plane (indicating in figure with M).It is distorting In aberration diagram, the longitudinal axis indicates angle of half field-of view (indicating in figure with ω), and shows the characteristic for being equivalent to the wavelength of d line.

[embodiment 4]

Fig. 7 is the sectional view along optical axis for indicating the structure of the zoom lens of embodiment 4.The zoom lens of the present embodiment Optical texture and each lens group when zooming movement, in addition in the 6th lens group G₆Middle configuration biconvex positive lens L₄₆₂Carry out generation For positive meniscus lens L₆₂It is identical as zoom lens shown in embodiment 1 except this point.Therefore, in the present embodiment, to The identical component of embodiment 1 adds identical label, and omits the detailed description about them.

Hereinafter, the relevant various numeric datas of the zoom lens for showing embodiment 4.

(surface data)

r₁=-87.698

d₁=1.300 nd₁=1.8042 ν d₁=46.50

r₂=52.797

d₂=D (2) (variable)

r₃=93.413

d₃=0.900 nd₂=1.8548 ν d₂=24.80

r₄=37.838

d₄=5.700 nd₃=1.4970 ν d₃=81.61

r₅=-53.869

d₅=0.150

r₆=33.677 (aspherical)

d₆=5.000 nd₄=1.6935 ν d₄=53.20

r₇=-67.360 (aspherical)

d₇=D (7) (variable)

r₈=-70.691 (aspherical)

d₈=0.600 nd₅=1.8514 ν d₅=40.10

r₉=10.250 (aspherical)

d₉=3.441

r₁₀=-11.717

d₁₀=0.600 nd₆=1.6385 ν d₆=55.45

r₁₁=80.294

d₁₁=0.176

r₁₂=43.624

d₁₂=2.310 nd₇=1.9229 ν d₇=20.88

r₁₃=-24.524

d₁₃=0.600 nd₈=1.7292 ν d₈=54.67

r₁₄=-46.616

d₁₄=D (14) (variable)

r₁₅=∞ (opening aperture)

d₁₅=0.600

r₁₆=36.940

d₁₆=4.210 nd₉=1.4970 ν d₉=81.61

r₁₇=-37.184

d₁₇=0.600 nd₁₀=1.8042 ν d₁₀=46.50

r₁₈=-82.098

d₁₈=D (18) (variable)

r₁₉=43.988 (aspherical)

d₁₉=3.200 nd₁₁=1.6935 ν d₁₁=53.20

r₂₀=-92.518 (aspherical)

d₂₀=0.150

r₂₁=14.558

d₂₁=7.440 nd₁₂=1.4970 ν d₁₂=81.61

r₂₂=-17.048

d₂₂=1.000 nd₁₃=1.8061 ν d₁₃=40.73

r₂₃=63.629

d₂₃=3.480 nd₁₄=1.8081 ν d₁₄=22.76

r₂₄=-33.337

d₂₄=0.150

r₂₅=26.905

d₂₅=1.000 nd₁₅=2.0010 ν d₁₅=29.13

r₂₆=8.052

d₂₆=5.290 nd₁₆=1.4970 ν d₁₆=81.61

r₂₇=-14.799

d₂₇=0.600 nd₁₇=1.6204 ν d₁₇=60.34

r₂₈=-49.354

d₂₈=D (28) (variable)

r₂₉=18.620

d₂₉=0.600 nd₁₈=1.9037 ν d₁₈=31.31

r₃₀=9.463

d₃₀=2.711

r₃₁=15.084

d₃₁=2.250 nd₁₉=1.6968 ν d₁₉=55.46

r₃₂=-181.440

d₃₂=4.400

r₃₃=∞

d₃₃=1.000 nd₂₀=1.5163 ν d₂₀=64.14

r₃₄=∞

d₃₄=1.000

r₃₅=∞ (image planes)

(the 6th face)

K=0,

A₄=-4.2932 × 10^-6, A₆=4.0241 × 10^-8,

A₈=-4.7280 × 10^-10, A₁₀=8.4476 × 10^-12,

A₁₂=-6.7890 × 10^-14, A₁₄=2.1651 × 10^-16

(the 7th face)

K=0,

A₄=4.1939 × 10^-7, A₆=8.9980 × 10^-9,

A₈=4.0304 × 10^-10, A₁₀=-1.6528 × 10^-12,

A₁₂=-1.5116 × 10^-14, A₁₄=1.1739 × 10^-16

(the 8th face)

K=0,

A₄=-3.9949 × 10^-6, A₆=1.8192 × 10^-7,

A₈=2.0321 × 10^-9, A₁₀=-6.3171 × 10^-11,

A₁₂=0, A₁₄=0

(the 9th face)

K=0,

A₄=-3.8713 × 10^-5, A₆=-1.0134 × 10^-6,

A₈=5.2657 × 10^-8, A₁₀=-7.4101 × 10^-10,

A₁₂=0, A₁₄=0

(the 19th face)

K=0,

A₄=4.7575 × 10^-6, A₆=-4.5557 × 10^-8,

A₈=2.1444 × 10^-9, A₁₀=-1.7342 × 10^-11,

A₁₂=-1.2945 × 10^-14, A₁₄=0

(the 20th face)

K=0,

A₄=2.2402 × 10^-5, A₆=-9.4619 × 10^-8,

A₈=3.0257 × 10^-9, A₁₀=-2.9738 × 10^-11,

A₁₂=2.2543 × 10^-14, A₁₄=0

(various data)

(variable focus lens package data)

(the relevant numerical value of conditional (1))

| F1/Fw |=9.54

(the relevant numerical value of conditional (2))

| F1/Ft |=0.85

(the relevant numerical value of conditional (3))

| F2/F3 |=2.85

(the relevant numerical value of conditional (4))

β 3t (the 3rd lens group G₃In the lateral magnification of telescope end)=- 1.21

β 3w (the 3rd lens group G₃In the lateral magnification of wide-angle side)=- 0.25

| β 3t/ β 3w |=4.90

(the relevant numerical value of conditional (5))

β pt (movable group (the 5th lens group G in subsequent lens group₅) in the lateral magnification of telescope end)=- 0.63

β pw (movable group (the 5th lens group G in subsequent lens group₅) in the lateral magnification of wide-angle side)=- 0.11

| β pt/ β pw |=5.60

Fig. 8 shows the various aberration diagrams of the zoom lens of embodiment 4.In spherical aberration diagram, the longitudinal axis indicates F number (figure In indicated with FNO), solid line shows the characteristic for being equivalent to the wavelength of d line (587.56nm), and single dotted broken line, which is shown, is equivalent to C line The characteristic of the wavelength of (656.28nm), dotted line show the characteristic for being equivalent to the wavelength of F line (486.13nm).In astigmatism figure, indulge Axis indicates angle of half field-of view (indicating in figure with ω), and shows the characteristic for being equivalent to the wavelength of d line.In addition, in astigmatism figure, it is real Line shows the characteristic of sagittal plane (indicating in figure with S), and dotted line shows the characteristic of meridional plane (indicating in figure with M).It is distorting In aberration diagram, the longitudinal axis indicates angle of half field-of view (indicating in figure with ω), and shows the characteristic for being equivalent to the wavelength of d line.

The correspondence table of conditional in the various embodiments described above described below.

[table 1]

Embodiment	1	2	3	4
					Conditional 1	9.86	15.00	8.99	9.54
Conditional 2	0.87	1.33	0.80	0.85
					Conditional 3	3.16	3.57	2.60	2.85
Conditional 4	3.49	3.66	3.59	4.90
					Conditional 5	6.09	4.33	4.05	5.60

In addition, in numeric data of the various embodiments described above, r₁, r₂... ... indicate the radius of curvature of lens surface etc., d₁, d₂... ... indicate the surface interval between the wall thickness or lens of lens etc., nd₁, nd₂... ... indicate lens etc. relative to d The refractive index of line (λ=587.56nm), ν d₁, ν d₂... ... indicate the Abbe number relative to d line (λ=587.56nm) such as lens. Also, the unit of length is all " mm ", and the unit of angle is all " ° ".

In addition, h is being set as by the height on the direction vertical with optical axis for above-mentioned each aspherical shape, it will be with lens Displacement at height h when surface vertices are origin in the direction of the optical axis is set as X, paraxial curvature radius is set as R, by circular cone Coefficient is set as k, and by 4 times, 6 times, 8 times, 10 times, 12 times, 14 asphericity coefficients are set to A₄, A₆, A₈, A₁₀, A₁₂, A₁₄, When image planes direction is set as positive direction, above-mentioned each aspherical shape can be indicated by formula as follows.

[formula 1]

As shown in the above embodiments, by meeting above-mentioned each conditional, it can be realized with higher Zoom ratio, and it is able to maintain that in entire zoom area good optical property, small-sized and high performance zoom lens.

< application examples >

Then, it shows zoom lens applications of the invention in the example of photographic device.Fig. 9, which is illustrated that, has the present invention Zoom lens photographic device an example figure.As shown in figure 9, photographic device 100 is by being accommodated with the saturating of zoom lens 10 What mirror lens barrel portion 11 and camera body 21 with solid-state imager 20 were constituted.Zoom lens 10 pass through machinery (not shown) The driving of mechanism executes zoom etc..In addition, as zoom lens 10, showing the change of embodiment 1 (referring to Fig.1) in Fig. 9 Focus lens, but zoom lens shown in embodiment 2~4 can be similarly carried on photographic device 100.

In the photographic device 100 with zoom lens 10 and solid-state imager 20, image planes IMG shown in FIG. 1 is suitable In the imaging surface of solid-state imager 20.As solid-state imager 20, CCD (Charge Coupled can be used for example Device: charge coupled device) or CMOS (Complementary Metal Oxide Semiconductor: Complementary metal Oxide semiconductor) etc. photo-electric conversion element.

In photographic device 100, from final the taking the photograph in solid-state imager 20 of the light of the object side incidence of zoom lens 10 It is imaged in image planes.Also, solid-state imager 20 carries out photoelectric conversion to the light received and exports as electric signal.The output Signal carries out calculation processing by signal processing circuit (not shown), and generates digital picture corresponding with subject image.Number Word image for example can recorde the record of HDD (Hard Disk Drive: hard disk drive), storage card, CD, tape etc. In medium.

By with structure as shown in Figure 9, may be implemented zoom ratio with higher, it is small-sized and high performance The photographic device of zoom lens.

In fig. 9 it is shown that by zoom lens applications of the invention in the example of monitor camera.But it is of the invention Zoom lens can be applied not only to monitor camera, can also be applied to video camera, digital still camera, single lens reflex type In camera, reflector-free single-lens reflex camera etc..

[industrial utilizability]

As described above, zoom lens of the invention take the photograph the small-sized of the solid-state imager equipped with CCD or CMOS etc. As device be it is useful, be particularly suitable for requiring the monitor camera of higher optical property.

Detailed description of the invention:

G₁: the 1st lens group；G₂: the 2nd lens group；G₃: the 3rd lens group；G₄: the 4th lens group；G₅: the 5th lens group；G₆: the 6th Lens group；G_R: subsequent lens group；L₁₁, L₃₁, L₃₂, L₅₃: double-concave negative lens；L₂₁, L₃₄, L₄₂, L₅₅, L₅₇, L₆₁: diverging meniscus lens； L₂₂, L₂₃, L₃₃, L₄₁, L₅₁, L₅₂, L₅₄, L₅₆, L₄₆₂: biconvex positive lens；L₆₂: positive meniscus lens；STP: opening aperture；CG: outer cover Glass；IMG: image planes；10: zoom lens；11: lens barrel portion；20: solid-state imager；21: camera body；100: taking the photograph As device.

Claims

1. a kind of zoom lens, which is characterized in that

The zoom lens are the 1st lens groups with negative refractive power, with positive refractive power by configuring in order from object side What the 2nd lens group, the 3rd lens group with negative refractive power and subsequent lens group were constituted,

Wherein, by least making the 2nd lens in the state of being always maintained at the 1st lens group relative to image planes fixation Group and the 3rd lens group are moved along optical axis, to change interval of each lens group on optical axis, are thus carried out from wide-angle The zoom of telescope end is held,

Also, the zoom lens meet conditional as follows:

(1)3.5≦|F1/Fw|≦20.0

(2)0.7≦|F1/Ft|≦2.0

(3)1.9≦|F2/F3|≦5.0

Wherein, F1 indicates that the focal length of the 1st lens group, Fw indicate the zoom lens in the focal length of wide-angle side, Ft The zoom lens are indicated in the focal length of telescope end, F2 indicates that the focal length of the 2nd lens group, F3 indicate the described 3rd The focal length of lens group.

2. zoom lens according to claim 1, which is characterized in that

The zoom lens meet conditional as follows:

(4)3.0≦|β3t/β3w|≦9.0

Wherein, β 3t indicates the 3rd lens group in the lateral magnification of telescope end, and β 3w indicates the 3rd lens group in wide-angle The lateral magnification at end.

3. zoom lens according to claim 1, which is characterized in that

The subsequent lens group is with the 4th lens group configuring in order from object side, with positive refractive power and has just in the wrong 5th lens group of luminous power.

4. zoom lens according to claim 3, which is characterized in that

When carrying out zoom, any one in the 4th lens group or the 5th lens group is moved along optical axis, and Meet conditional as follows:

(5)3.0≦|βpt/βpw|≦10.0

Wherein, β pt indicates the movable group in the subsequent lens group in the lateral magnification of telescope end, and β pw indicates described subsequent The lateral magnification of movable group in lens group in wide-angle side.

5. zoom lens according to claim 1, which is characterized in that

1st lens group is made of 1 lens.

6. zoom lens according to claim 3, which is characterized in that

The image planes side of 5th lens group in the subsequent lens group, described is configured with the 6th lens group with positive refractive power.

7. a kind of photographic device, which is characterized in that the photographic device includes

Zoom lens described in any one in claim 1~6, and

The optical image formed by the zoom lens is converted to electric signal by solid-state imager.