CN102073128B - Zoom lens - Google Patents

Abstract

The invention provides a zoom lens of an internal focusing system, which is small and light, has good imaging performance, reduces the weight of a focusing lens by using a 3 rd lens group closer to an imaging side than a diaphragm as the focusing lens, and does not bring a large burden to an automatic focusing mechanism. The zoom lens capable of moving a part of an M lens group in a direction perpendicular to an optical axis while preventing vibration, includes: a 1 st lens group located on the object side of the M lens group, the 1 st lens group moving on an optical axis upon zooming such that an air space between the 1 st lens group and a lens group located on the object side of the M lens group becomes larger at a telephoto end with respect to a wide-angle end; and an F lens group disposed between the 1 st lens group and the M lens group, the F lens group having positive power and moving back and forth on the optical axis during zooming, and a stop S disposed on the object side of the F lens group, the F lens group moving back and forth on the optical axis during focusing from an object distance infinity to a close distance.

Description

zoom lens

technical field

The present invention relates to a zoom lens used for a 35mm camera, video camera, electronic still camera (Still Camera) and the like. A zoom lens on a monocular camera.

Background technique

In conventional zoom lenses for single-lens reflex cameras, there is a rotating mirror between the zoom lens and the light-receiving element, which requires a longer back focal length, limiting the freedom of zoom lens design. In the mirrorless SLR camera, there is an advantage that the back focal length of the zoom lens can be shortened and the degree of freedom in zoom lens design can be increased.

As a conventional zoom lens, there has been proposed a zoom lens having, in order from the longer conjugate side: a first lens group with positive refractive power, a second lens group with negative refractive power, and multiple A follow-up group composed of one or one lens group and the overall positive refractive power, wherein, when zooming from the wide-angle end to the telephoto end, the interval between the first lens group and the second lens group becomes larger, and the first lens group The interval between the 2 lens groups and the above-mentioned subsequent groups becomes smaller, and the above-mentioned 2nd lens group has a negative refractive power of the 2a group and a negative light arranged on the shorter conjugate side than the 2a group. The 2b group of focal power, when using this 2b group for focusing (Focusing) and the magnification of the above-mentioned 2b group at the wide-angle end as β2bw, satisfies the condition of 0<β2bw<1 (for example, refer to Patent Document 1 ).

As another conventional zoom lens, there has been proposed a zoom lens having an aperture stop (diaphragm) S and a plurality of lens groups, and having, in order from the closest to the object side: the first lens of positive refractive power. Lens group G1, the second lens group G2 with negative refractive power, and the third lens group G3, wherein when zooming from the wide-angle end state W to the telephoto end state T, the first lens group and the second lens group The distance between the above-mentioned second lens group and the above-mentioned third lens group is reduced, and the above-mentioned second lens group and at least one lens group located on the image side than the above-mentioned second lens group are focusing lenses. group, according to the focal length state from the wide-angle end state to the telephoto end state, at least one lens group in the above-mentioned focusing lens group is moved to focus from a distant object to a short-distance object, thereby satisfying a prescribed condition (for example, refer to the patent document 2).

As another conventional zoom lens, the following zoom lens system has been proposed, which includes sequentially from the object side to the image side:

The first lens group with positive refractive power;

A second lens group with negative power;

3rd lens group with negative power;

4th lens group with positive power,

When zooming (zooming), at least the first lens group is moved from the wide-angle end to the telephoto end,

The above-mentioned 4th lens group includes: the 1st sub-lens (sub-lens) group that has positive refractive power, the 2nd sub-lens group that is disposed on the image side than the above-mentioned 1st sub-lens group and has negative refractive power,

When correcting image blur caused by vibration of the zoom lens system, the first sub-lens group or the second sub-lens group is moved in a direction perpendicular to the optical axis (for example, refer to Patent Document 3).

044848号Patent Document 1: JP-A-11

044848

093974号Patent Document 2: JP 2007

093974

175954号Patent Document 3: JP 2010

175954

In the zoom lens disclosed in Patent Document 1, the above-mentioned second lens components are group 2a with negative refractive power and group 2b with negative refractive power arranged on the conjugate side shorter than group 2a. , using the 2b group lens composed of about 3 lenses to adjust the focus. The lens group 2b composed of about three lenses is relatively heavy, and thus has a problem of placing a large burden on an auto focus (Auto Focus) mechanism.

In the zoom lens disclosed in Patent Document 2, the zoom lens has a structure in which the second lens group and at least one lens group located on the image side of the second lens group are the focusing lens group. The focal length state from the state to the telephoto end state moves at least one of the focusing lens groups to focus from a distant object to a short-distance object. That is, in the first embodiment (FIG. 1) of Patent Document 2, G2 and G3 are moved to focus in the wide-angle state and the intermediate state, and only G2 is moved to focus in the telephoto state. In the second example (FIG. 4) of Patent Document 2, only G3 is moved to focus in the wide-angle state, G2 and G3 are moved to focus in the intermediate state, and only G2 is moved to focus in the telephoto state.

In the zoom lens disclosed in Patent Document 2, focusing is performed by selectively moving the second lens group G2 with negative refractive power and at least one lens group G3 located on the image side of the second lens group, Therefore, there is a problem that the structure of the lens barrel becomes complicated, and there is also a problem that the operation load of the autofocus mechanism increases due to the large number of movable lenses of the focus lens.

In the zoom lens disclosed in Patent Document 3, with the above configuration, it is possible to obtain a zoom lens system in which the focus lens group is compact and the change in imaging magnification is small when the focus lens group is moved. However, since the diaphragm of Patent Document 3 is arranged very close to the subject-side first surface of the fourth lens group G4, there is a problem that the lens diameters of the first lens group G1 to the third lens group G3 become large.

Contents of the invention

The present invention is made in view of the above-mentioned problems of conventional zoom lenses, and an object of the present invention is to provide a small, lightweight, high-magnification zoom lens with an inner focus method and excellent imaging performance.

In particular, an object of the present invention is to provide a zoom lens that reduces the weight of the focus lens by using the third lens group on the imaging side of the aperture as the focus lens without placing a large burden on the autofocus mechanism.

Another object of the present invention is to provide a zoom lens that reduces the number of lens groups for focusing, simplifies lens movement for focusing, is light in weight, and does not place a large burden on an autofocus mechanism.

In addition, the object of the present invention is to provide a lens group that arranges the aperture position closer to the subject side to reduce the diameter of the lens group on the subject side than the aperture position, thereby achieving miniaturization, weight reduction, and cost reduction. zoom lens.

The present invention is a zoom lens. Among the lens groups constituting the zoom lens system, the zoom lens can make a part of the M lens group move in a direction perpendicular to the optical axis during anti-vibration. It is characterized in that it includes:

The first lens group is located on the object side of the above-mentioned M lens group, and the first lens group moves on the optical axis during zooming in such a manner that the first lens group is positioned closer to the object side than the above-mentioned M lens group. Compared with the wide-angle end, the air gap between the lens groups on the object side becomes larger at the telephoto end;

F lens group, which is arranged between the above-mentioned first lens group and the above-mentioned M lens group, the F lens group has positive refractive power, and moves back and forth on the optical axis during zooming,

The aperture S is located on the object side of the above-mentioned F lens group,

When focusing from an object distance of infinity to a short distance, the above-mentioned F lens group moves back and forth on the optical axis.

The zoom lens of the present invention is configured as described above, and can be configured as a zoom lens with a zoom ratio of, for example, about 10 times: using the inner focusing method, the overall length does not change due to focusing from the infinite distance of the object to the short distance, It is compact and lightweight and has good optical performance even when shooting subjects at close range.

According to the zoom lens of the present invention, it is also possible to configure a zoom lens in which the weight of the focus lens can be reduced by using the third lens group as the focus lens without imposing a large burden on the autofocus mechanism.

In addition, it is also possible to configure a zoom lens that reduces the number of lens groups for focusing, simplifies lens movement for focusing, is lightweight, and does not place a large burden on the autofocus mechanism.

In addition, it is also possible to configure a zoom lens in which the diameter of the lens group closer to the object than the aperture position is reduced by arranging the aperture position on the object side, thereby achieving miniaturization, weight reduction, and cost reduction.

In the zoom lens of the present invention described above, the total thickness of the first lens group can be reduced, and the overall length of the zoom lens can be shortened. The aperture of the aperture S can be a constant aperture or a variable aperture in the full zoom area and the focus area.

In the zoom lens of the present invention, the aperture at the telephoto end can be larger than the aperture at the wide-angle end.

Embodiments of the present invention and characteristics of the embodiments will be described below.

(1) In the present invention, the first embodiment is characterized in that the F lens group is constituted by a single lens element. The above-mentioned F lens group has fewer lenses than other lens groups and properly corrects aberrations. Therefore, at least one or more aspheric surfaces are provided to properly correct spherical aberration and off-axis coma aberration. By configuring the F-lens group with a simple structure, it is possible to reduce the weight of the F-lens group and perform autofocus at high speed.

The above-mentioned F lens group can also be composed of a spherical lens, but when high imaging performance is required, it is preferable to provide at least one aspheric surface.

Here, a single lens element includes a single ground lens, an aspheric lens, a compound aspheric lens, and a cemented lens. In addition, single lens elements also include compound aspheric lenses and cemented lenses, excluding positive/negative lenses with an air layer in between.

(2) In the present invention, the second embodiment is characterized in that when zooming, the distance between the above-mentioned F lens group and the lens group arranged on the object side of the above-mentioned F lens group is at the telephoto end with respect to the wide-angle end. Variations in the way the end narrows.

With this configuration, it is possible to ensure a constant image plane position while ensuring a sufficient zoom ratio. In addition, since the F lens group has positive refractive power, the F lens group moves toward the imaging surface side when focusing from infinity to a short distance from an object. Therefore, the interval between the above-mentioned F lens group and the above-mentioned M lens group is smaller at the wide-angle end than at the telephoto end when the object distance is infinite, and the interval is the largest at the telephoto end.

(3) In the present invention, the third embodiment is characterized by satisfying the following condition (1).

0.03<FF/FT<0.50(1)

FF: Focal length of F lens group

FT: focal length at the telephoto end

The conditional expression (1) is used to define the focal length of the above-mentioned F lens group at the telephoto end.

If the focal length of the above-mentioned F lens group becomes longer than the upper limit value, the amount of movement required to focus from the object distance infinity to a short distance increases, resulting in an increase in the overall length of the optical system, so the above-mentioned F lens group is not preferable. The focal length exceeds the upper limit.

Conversely, if the focal length of the F lens group is shortened below the lower limit, the amount of movement required to focus from the object distance infinity to the short distance is reduced, and the overall length can be shortened. However, the negative optical power is too strong, causing the image to fall into the objective lens side, especially the curvature of the image plane in the close state becomes large, which cannot be tolerated.

If the conditional expression (1) is further limited to 0.05<FF/FT<0.45, the total optical length can be further appropriately limited, and field curvature at the time of approach can be corrected.

If the conditional expression (1) is further limited to 0.06<FF/FT<0.40, the total optical length can be further appropriately limited and field curvature at the time of approach can be corrected.

(4) In the present invention, the fourth embodiment is characterized in that the anti-vibration lens group MVC that moves in a direction perpendicular to the optical axis during anti-vibration has negative refractive power as a whole, and that the anti-vibration lens group MVC includes at least positive lens and negative lens, and satisfy the following condition (2).

-1.0＜FVC/FM＜-0.1(2)

FVC: Focal length of the anti-vibration lens group MVC included in the M lens group

FM: Focal length of M lens group

If the paraxial lateral magnification of the anti-vibration group is set as β1, and the paraxial lateral magnification of the lens group after the anti-vibration group is set as β2, then the anti-vibration group required for anti-vibration along the direction perpendicular to the optical axis The amount of movement and the so-called

Blur correction coefficient: proportional to (1-β1)×β2.

The paraxial lateral magnification β1 of the lens group with negative power is negative. This makes it possible to easily increase the absolute value of the blur correction coefficient and perform necessary anti-vibration with a small amount of movement, compared to the case of a lens group with positive refractive power.

In this embodiment, in order to prevent the deterioration of the axial chromatic aberration during the anti-vibration, the anti-vibration group is composed of at least two lenses, positive and negative. About 7 or so.

The conditional expression (2) defines the ratio of the focal length of the anti-vibration lens group MVC included in the M lens group to the focal length of the M lens group.

When the anti-vibration lens group MVC is moved in a direction perpendicular to the optical axis during anti-vibration, if FVC/FM exceeds the upper limit value of the conditional expression, the anti-vibration correction amount increases, resulting in the failure of the anti-vibration mechanism. Since the size increases, it is not preferable that FVC/FM exceed the upper limit. Also, if FVC/FM is lower than the lower limit value of the conditional expression, the anti-vibration sensitivity of the above-mentioned anti-vibration lens group MVC becomes high, making it difficult to ensure the accuracy of position control necessary for performing blur correction.

If the conditional expression (2) is limited to −0.54<FVC/FM<−0.12, the miniaturization of the anti-vibration mechanism and the imaging performance during anti-vibration can be further improved.

If the conditional expression (2) is further limited to -0.33<FVC/FM<-0.21, the miniaturization of the anti-vibration mechanism and the imaging performance during anti-vibration can be further improved.

(5) In the present invention, the fifth embodiment is characterized by satisfying the following condition (3)

0.18＜|F1/FT|＜2.10(3)

F1: focal length of the first lens group

FT: focal length at the telephoto end

The conditional expression (3) defines the focal length of the first lens group at the telephoto end. If the focal length of the above-mentioned first lens group becomes longer than the upper limit, the total length of the optical system at the telephoto end increases, and the amount of movement of the first lens group from the wide-angle end to the telephoto end increases, resulting in Problems where the diameter of the lens barrel becomes larger or the overall length of the lens barrel increases. If the focal length of the first lens group becomes shorter than the lower limit, it will be difficult to correct excessive g-line axial chromatic aberration that occurs at the telephoto end.

If the conditional expression (3) is further limited to 0.20<|F1/FT|<2.05, the size of the lens barrel can be appropriately controlled, and axial chromatic aberration can be corrected more appropriately and well-balanced.

If the conditional expression (3) is further limited to 0.21<|F1/FT|<2.00, the size of the lens barrel can be further appropriately controlled, and axial chromatic aberration can be corrected in a more appropriate and well-balanced manner.

(6) In the present invention, a sixth embodiment is characterized in that a second lens group having negative refractive power is provided between the first lens group and the F lens group.

The present invention can also adopt a so-called PLUSLEAD (PLUSLEAD: the first lens group has a positive refractive power) 4-group zoom structure, 5-group zoom structure, etc., and the sixth embodiment has a small number of lenses and can realize a simple lens barrel Structure of 4 groups of zoom structures. In the sixth embodiment, when zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the F lens group decrease. With this structure, the image plane position can be kept constant while securing a sufficient zoom ratio

(7) In addition to the first to sixth embodiments, the seventh embodiment is characterized in that the distance between the first lens group and the second lens group increases from the wide-angle end to the The telephoto end moves on the optical axis, and the above-mentioned F lens group and the above-mentioned M lens group move on the optical axis from the wide-angle end to the telephoto end in such a manner that the interval therebetween is narrowed.

In the seventh embodiment, from the wide-angle end to the telephoto end, the above-mentioned first lens group moves in a direction of emitting toward the object side with respect to the imaging plane. According to this configuration, the zoom ratio between the first lens group and the second lens group can be further increased, and the size of the lens barrel can be reduced in size.

During zooming, the above-mentioned second lens group may be fixed with respect to the imaging surface, or may move with respect to the imaging surface.

In the present invention, an eighth embodiment is characterized in that the aperture S moves integrally with the M lens group during zooming.

In the eighth embodiment, if the diaphragm constitutes the lens barrel as one independent moving group, dedicated cam grooves for the cam ring are required. In order to avoid interference with other cam grooves, it is inevitable to increase the diameter of the lens barrel.

(8) In the present invention, the ninth embodiment is characterized by satisfying the following condition (4).

0.70<|ΔT1/F1|<1.10(4)

ΔT1: The amount of movement of the above-mentioned first lens group from the wide-angle end to the telephoto end based on the position of the wide-angle end (the release to the object side is a positive value)

F1: Focal length of the first lens group above

The conditional expression (4) defines the amount of movement on the optical axis of the first lens group.

When the moving mechanism of the first lens group is constituted by a cam, if the upper limit value of the conditional expression (4) is exceeded, the cam curve of the cam groove cannot be formed smoothly, and a compact lens barrel cannot be formed.

If it is less than the lower limit value of conditional expression (4), the decentering sensitivity of the said 1st lens group will become high by shortening the total length of a telephoto end, and there will be a problem in manufacture. There is also a problem that the overall length of the wide-angle end becomes longer, resulting in a larger diameter of the front lens.

If the conditional expression (4) is further limited to 0.74<|ΔT1/F1|<0.97, the balance between the lens barrel size and decentering sensitivity can be rationalized.

If the conditional expression (4) is further limited to 0.78<|ΔT1/F1|<0.84, the balance between the size of the lens barrel and the eccentricity sensitivity can be further rationalized.

In the present invention, the ninth embodiment is characterized by satisfying the following conditional expression (5).

0.025<ΔT3/F3<0.160(5)

ΔT3: The amount of movement of Group F from the wide-angle end to the telephoto end based on the position of the wide-angle end (the release to the object side is a positive value)

F3: focal length of the third lens group

The conditional expression (5) is used to define the amount of movement on the optical axis of the above-mentioned group F.

When the upper limit value of the conditional expression (5) is exceeded, the movement amount of the third lens group increases, and the problem of unavoidable enlargement of the driving device for performing focusing occurs.

If it is less than the lower limit value of the conditional expression (5), the above-mentioned problem that the optical power of the F group increases and the eccentricity sensitivity becomes high will arise.

If the conditional expression (5) is further limited to 0.030<ΔT3/F3<0.140, the balance between the lens barrel size and decentering sensitivity can be further rationalized.

If the conditional expression (5) is further limited to 0.037<ΔT3/F3<0.120, the balance between the lens barrel size and decentering sensitivity can be further rationalized.

Description of drawings

FIG. 1 is an optical diagram of a zoom lens according to a first embodiment of the present invention, and the diagram also includes a zoom shift diagram of each lens group.

2 is an aberration diagram of spherical aberration, astigmatism, and distortion at the zoom wide-angle end of the zoom lens according to the first embodiment of the present invention.

3 is an aberration diagram of spherical aberration, astigmatism, and distortion at a zoom intermediate focal length of the zoom lens according to the first embodiment of the present invention.

4 is an aberration diagram of spherical aberration, astigmatism, and distortion at the zoom telephoto end of the zoom lens according to the first embodiment of the present invention.

5 is a lateral aberration diagram of a basic state without blur correction and a state after blur correction at the zoom telephoto end of the zoom lens according to the first embodiment of the present invention.

6 is an optical diagram of a zoom lens according to a second embodiment of the present invention, and the diagram also includes a diagram of zoom movement of each lens group.

7 is an aberration diagram of spherical aberration, astigmatism, and distortion at the zoom wide-angle end of the zoom lens according to the second embodiment of the present invention.

8 is an aberration diagram of spherical aberration, astigmatism, and distortion at the zoom intermediate focal length of the zoom lens according to the second embodiment of the present invention.

9 is an aberration diagram of spherical aberration, astigmatism, and distortion at the zoom telephoto end of the zoom lens according to the second embodiment of the present invention.

10 is a lateral aberration diagram of a basic state without blur correction and a state after blur correction at the zoom telephoto end of the zoom lens according to the second embodiment of the present invention.

FIG. 11 is an optical diagram of a zoom lens according to a third embodiment of the present invention, and the diagram also includes a zoom shift diagram of each lens group.

12 is an aberration diagram of spherical aberration, astigmatism, and distortion at the zoom wide-angle end of the zoom lens according to the third embodiment of the present invention.

13 is an aberration diagram of spherical aberration, astigmatism, and distortion at the zoom intermediate focal length of the zoom lens according to the third embodiment of the present invention.

14 is an aberration diagram of spherical aberration, astigmatism, and distortion at the zoom telephoto end of the zoom lens according to the third embodiment of the present invention.

15 is a lateral aberration diagram of a basic state without blur correction and a state after blur correction at the zoom telephoto end of the zoom lens according to the third embodiment of the present invention.

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each embodiment, the length unit of the numerical table is all "mm", and the unit of the viewing angle is all "°". In addition, R is the radius of curvature, D is the distance between planes, Nd is the refractive index with respect to the d-line, and Vd is the Abbe number with respect to the d-line. In addition, the surface with ASP is aspherical. The aspherical shape is defined by the following equation.

z=ch2/[1+{1-(1+k)c2h2}1/2]+A4h4+A6h6+A8h8+A10h10...

c: Curvature (1/r)

h: height from the optical axis

k: Conic coefficient

A4, A6, A8, A10...: aspherical coefficients of each order

In the aberration diagrams of the respective embodiments, spherical aberration (mm), astigmatism (mm), and distortion (%) are shown in order from the left. In the spherical aberration diagram, the vertical axis represents the F value (indicated by Fno in the figure), the solid line is the characteristic of the d-line, and the dotted line is the characteristic of the g-line. In the astigmatism diagram, the vertical axis represents the field angle (indicated by ω in the figure), the solid line is the characteristic of the sagittal image plane (indicated by s in the figure), and the dotted line is the characteristic of the meridional image plane (in the figure denoted by m). In the distortion graph, the vertical axis represents the angle of view (indicated by ω in the graph).

In each lateral aberration diagram, the state of no blur correction at the telephoto end is shown in the center, and the blur at the telephoto end by moving the anti-vibration group by a predetermined amount in a direction approximately perpendicular to the optical axis is shown on the upper or lower side Calibration status.

The upper row of each lateral aberration diagram corresponds to the lateral aberration of an image point at 70% of the maximum real image height, and the lower row corresponds to the lateral aberration of an image point at −70% of the maximum real image height.

The horizontal axis of each lateral aberration diagram represents the distance from the chief ray on the pupil plane, the solid line represents the d-line characteristic, and the dotted line represents the g-line characteristic.

first embodiment

As shown in FIG. 1 , the zoom lens according to the first embodiment of the present invention includes in order from the object side: a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a diaphragm S, and The F lens group F of the focus lens with positive refractive power, the M lens group M with positive refractive power.

The M lens group M includes, in order from the object side, an MA lens group MA with positive refractive power, an MVC lens group MVC that moves in a direction perpendicular to the optical axis during vibration prevention, and an MC lens group MC.

The MA lens group MA includes, from the object side, a cemented lens of two convex lenses and a negative convex-concave lens having a convex surface on the image plane side, and a cemented lens of a negative convex-concave lens and a positive lens having a convex surface on the object side.

By employing such a structure, it is possible to effectively correct axial chromatic aberration from the wide-angle end to the telephoto end.

Compared with the front and rear lens groups and the lens groups in the entire lens system, the MVC lens group has a smaller lens diameter, which makes the anti-vibration mechanism easy to assemble into the lens barrel.

By interposing the MA lens unit between the F lens unit and the MVC lens unit that serves as an anti-vibration lens unit, a space is secured for the drive unit to be easily accommodated in the lens barrel.

By employing such a configuration, it is possible to reduce the size of the lens barrel, and to appropriately disperse the optical power among the lens groups, so that it is possible to satisfactorily correct aberration fluctuations accompanying hand-shake correction.

In addition, whether it is a structure in which a positive lens or a negative lens with weaker refractive power is arranged as a fixed group closer to the imaging surface side than the MC lens group, or the distance between the MVC lens group and the MC lens group is changed during zooming, structure, the effects of the present invention can be obtained by properly implementing the present invention.

The optical data of the zoom lens of the first embodiment are as follows.

Side No. R D D Nd Vd

1 ∞ variable

2 132.680 1.500 1.90366 31.3

3 58.992 7.413 1.43500 95.0

4 -463.265 0.200

5 58.944 5.895 1.72916 54.7

6 459.705 variable

7ASP 52.006 0.200 1.51460 50.0

8 38.999 1.200 1.88300 40.8

9 12.134 6.494

10 -24.705 0.800 1.80420 46.5

11 798.423 0.200

12 38.348 3.000 1.92286 20.9

13 -39.115 1.264

14 -17.349 1.000 1.80139 45.4

15ASP -56.221 variable

16 aperture ∞ variable

17ASP 38.831 2.600 1.69350 53.2

18ASP -61.605 variable

19 19.089 5.206 1.49700 81.6

20 -20.334 1.656 1.80610 33.3

21 -41.800 1.237

22 22.199 1.221 1.90366 31.3

23 10.389 3.774 1.49700 81.6

24 129.045 1.100

25ASP 244.003 3.500 1.68893 31.1

26 -11.815 0.800 1.83481 42.7

27 22.012 1.905

28 36.993 7.000 1.54072 47.2

29 -22.175 2.991

30 -13.027 1.000 1.88300 40.8

31 -38.763 0.200

32 98.457 3.051 1.67270 32.2

33 -46.273 variable

34 ∞ 2.000 1.51680 64.2

35 ∞

Aspheric coefficient

The seventh side K＝0.00000E+00A4＝2.11773E-05A6＝-7.42565E-08A8＝2.76094E-10

A10＝4.23754E-13

Face 15 K=0.00000E+00A4=-2.56488E-06A6=-1.77205E-08A8=-1.29711E-09

A10＝1.69949E-11

The 17th face K=2.50125E+00A4=-9.11521E-06A6=-7.20102E-07A8=1.32972E-08

A10＝-1.24641E-10

The 18th face K=0.00000E+00A4=1.01753E-05A6=-8.28466E-07A8=1.46868E-08

A10＝-1.30385E-10

The 25th face K=0.00000E+00A4=4.27471E-05A6=-5.26048E-07A8=1.52615E-08

A10＝-1.07325E-10

Wide Angle Middle Telephoto Closest Telephoto Telephoto VC

Focal Length 18.50 60.00 194.00 102.82 194.02

F value 3.56 5.50 6.47 6.35 6.43

Field of view 39.18 13.03 4.09 5.26 4.62

D1 ∞ ∞ ∞ ∞ ∞ 310.769 ∞

D6 0.800 25.131 55.897 55.897 55.897

D15 18.053 4.815 1.050 1.050 1.050

D16 4.056 5.655 1.898 8.486 1.898

D18 5.652 4.054 7.810 1.223 7.811

D33 12.500 39.912 49.348 49.348 49.348

Lens full length 114.296 152.841 189.246 189.412 189.250

2nd embodiment

The optical data of the zoom lens of the second embodiment are as follows.

Side No. R D D Nd Vd

1 ∞ variable

2 163.063 1.500 1.90366 31.3

3 63.626 7.400 1.49700 81.6

4 -264.648 0.200

5 57.094 5.500 1.69680 55.5

6 279.674 variable

7ASP 36.588 0.200 1.51460 50.0

8 31.367 1.200 1.88300 40.8

9 11.621 6.414

10 -22.843 0.800 1.83481 42.7

11 68.433 0.200

12 34.655 3.000 1.92286 20.9

13 -34.655 1.179

14 -15.982 1.000 1.77377 47.2

15ASP -38.141 variable

16 aperture ∞ variable

17ASP 37.949 2.600 1.60970 57.7

18 -60.068 variable

19 20.450 5.400 1.49700 81.6

20 -20.450 1.000 1.80610 33.3

21 -39.478 0.200

22 26.672 4.200 1.90366 31.3

23 10.500 4.100 1.49700 81.6

24 705.144 1.300

25ASP 92.659 3.600 1.68893 31.1

26 -12.120 0.800 1.83481 42.7

27 21.100 1.926

28 36.164 4.796 1.54072 47.2

29 -17.400 2.905

30 -12.120 1.000 1.88300 40.8

31 -91.500 0.200

32 63.150 4.200 1.62004 36.3

33 -27.795 variable

34 ∞ 2.000 1.51680 64.2

35 ∞

Aspheric coefficient

The seventh side K＝0.00000E+00A4＝1.60231E-05A6＝-4.45788E-08A8＝-7.17694E-12

A10＝2.31982E-12

The 15th face K=0.00000E+00A4=-9.11159E-07A6=-5.54231E-08A8=-7.90988E-10

A10＝1.72250E-11

The 17th face K=5.74528E+00A4=-3.06096E-05A6=9.15398E-08A8=-2.19747E-09

A10＝1.35180E-11

The 25th face K=0.00000E+00A4=4.21760E-05A6=-6.58715E-07A8=2.26551E-08

A10＝-1.98372E-10

Wide Angle Middle Telephoto Closest Telephoto Telephoto VC

Focal Length 18.50 60.00 194.00 104.13 194.01

F value 3.56 5.50 6.47 6.40 6.47

Field of view 39.18 13.01 4.10 5.17 4.64

D1 ∞ ∞ ∞ ∞ ∞ 310.600 ∞

D6 0.800 25.146 55.026 55.026 55.026

D15 18.113 5.350 1.050 1.050 1.050

D16 3.659 5.104 1.898 8.472 1.898

D18 6.034 4.590 7.796 1.223 7.796

D34 12.621 40.004 49.989 49.990 49.989

Lens full length 114.877 153.882 189.414 189.580 189.417

third embodiment

The optical data of the zoom lens of the third embodiment are as follows.

Side No. R D D Nd Vd

1 ∞ variable

2 285.090 1.500 1.90366 31.3

3 66.154 8.034 1.49700 81.6

4 -183.176 0.200

5 60.361 5.920 1.74330 49.2

6 440.538 variable

7ASP 74.180 0.200 1.51460 50.0

8 56.220 1.200 1.83400 37.3

9 12.048 5.000

10 -26.173 0.800 1.80420 46.5

11 127.032 0.200

12 44.979 3.052 1.92286 20.9

13 -30.686 2.718

14 -13.717 1.000 1.80420 46.5

15ASP -28.043 variable

16 aperture ∞ variable

17ASP 26.634 2.600 1.69680 55.5

18ASP -122.026 variable

19 18.765 7.339 1.49700 81.6

20 -19.240 1.745 1.80610 33.3

21 -33.337 0.386

22 20.040 0.919 1.90366 31.3

23 8.830 3.301 1.48749 70.4

24ASP 30.146 1.200

25 34.101 2.960 1.68893 31.1

26 -34.567 0.800 1.83481 42.7

27 21.724 1.904

28 286.649 1.000 1.91082 35.2

29 31.767 3.511 1.60342 38.0

30 -18.872 0.668

31 -13.465 1.000 1.88300 40.8

32 -634.183 0.200

33 42.628 6.700 1.63980 34.6

34 -32.581 variable

35 ∞ 2.000 1.51680 64.2

36 ∞

Aspheric coefficient

The seventh side K＝0.00000E+00A4＝1.98641E-05A6＝6.25788E-08A8＝-6.82167E-10

A10＝3.69951E-12

The 15th face K=0.00000E+00A4=-1.67728E-05A6=6.22706E-08A8=-1.81664E-09

A10＝1.20763E-11

The 17th face K=-1.44338E+01A4=7.98067E-05A6=-3.00674E-07A8=-1.29058E-09

A10＝3.18668E-11

The 18th face K=0.00000E+00A4=4.18026E-06A6=3.72388E-07A8=-5.81276E-09

A10＝4.80012E-11

The 24th face K=0.00000E+00A4=2.57469E-05A6=4.41971E-07A8=-5.70126E-09

A10＝1.09667E-10

Wide Angle Middle Telephoto Closest Telephoto Telephoto VC

Focal Length 18.00 60.00 200.00 103.64 200.00

F value 3.50 5.80 6.30 6.30 6.30

Field of view 39.86 13.08 3.92 5.19 5.00

D1 ∞ ∞ ∞ 308.213 ∞ ∞

D6 0.800 21.031 58.450 58.450 58.450

D15 18.096 3.522 1.300 1.300 1.300

D16 4.613 6.746 1.900 8.733 1.900

D18 5.220 3.087 7.933 1.100 7.933

D34 12.500 46.905 49.579 49.579 49.579

Lens full length 114.105 154.166 192.035 192.037 192.035

The values of the conditional expressions of the zoom lenses of the respective embodiments are as follows.

The first embodiment The second embodiment The third embodiment

Conditional expression (1) FF/FT 0.179 0.199 0.158

Conditional expression (2) FVC/FM -0.240 -0.355 -0.349

Conditional expression (3) |F1/FT| 0.482 0.474 0.470

Conditional expression (4) |ΔT1/F1| 0.802 0.810 0.828

Conditional expression (5) ΔT3/F3 0.062 0.046 0.086

Claims (8)

1. zoom lens, in the lens combination that constitutes Zoom lens system, this zoom lens can make the part of M lens combination move along the direction vertical with optical axis when vibrationproof, it is characterized in that this zoom lens comprises:

The 1st lens combination; It is positioned at the position of leaning on object side than above-mentioned M lens combination; The 1st lens combination moves on optical axis in the following manner when zoom; That is, make the 1st lens combination and the airspace between the lens combination of the position of leaning on object side than above-mentioned M lens combination become big at telescope end with respect to wide-angle side;

The F lens combination, it is configured between above-mentioned the 1st lens combination and the above-mentioned M lens combination, and this F lens combination has positive light coke, and move front and back on optical axis when zoom, and this F lens combination is made up of the lens element of monomer;

Aperture S, it is located at the position of leaning on object side than above-mentioned F lens combination,

From the object distance infinity when closely focusing, above-mentioned F lens combination moves before and after on optical axis.

2. zoom lens according to claim 1 is characterized in that, when zoom, and above-mentioned F lens combination and lean on interval between the lens combination that object side ground disposes to change in the mode that telescope end narrows down with respect to wide-angle side than above-mentioned F lens combination.

3. zoom lens according to claim 1 is characterized in that, the condition below satisfying,

0.03＜FF/FT＜0.50 (1)

0.18＜|F1/FT|＜2.10 (3)

The focal length of FF:F lens combination

FT: the focal length of telescope end

F1: the focal length of the 1st lens combination.

4. zoom lens according to claim 1 is characterized in that, the vibration-proof lens group MVC integral body that when vibrationproof, moves along the direction vertical with optical axis has negative power, and this vibration-proof lens group MVC comprises positive lens and negative lens at least, the condition below satisfying,

-1.0＜FVC/FM＜-0.1 (2)

The focal length of the vibration-proof lens group MVC that is comprised in the FVC:M lens combination

The focal length of FM:M lens combination.

5. zoom lens according to claim 1 is characterized in that, between above-mentioned the 1st lens combination and above-mentioned F lens combination, has the 2nd lens combination of negative power.

6. according to any described zoom lens in the claim 1～5, it is characterized in that when zoom, said aperture S and above-mentioned M lens combination move integratedly.

7. zoom lens according to claim 1 is characterized in that, the condition below satisfying,

0.70＜|ΔT1/F1|＜1.10 (4)

Δ T1: the position with wide-angle side from the wide-angle side to the telescope end is the amount of movement of above-mentioned the 1st lens combination of benchmark, to object side move on the occasion of

F1: the focal length of above-mentioned the 1st lens combination.

8. zoom lens according to claim 1 is characterized in that, the condition below satisfying,

0.025＜T3/F3＜0.160 (5)

Δ T3: the position with wide-angle side from the wide-angle side to the telescope end is the amount of movement of the F lens combination of benchmark, to object side move on the occasion of

F3: the focal length of the 3rd lens combination.

Images