JP7088327B2 - Variable magnification optics and optical equipment - Google Patents

Description

The present invention relates to a variable magnification optical system and an optical device using the same.

Conventionally, variable magnification optical systems suitable for photographic cameras, electronic still cameras, video cameras and the like have been proposed (see, for example, Patent Document 1).

Japanese Patent Laid-Open No. 4-293007

However, in the conventional variable magnification optical system, the weight reduction of the focusing lens group is insufficient.

The variable magnification optical system according to the present invention has a front lens group composed of one lens group and having a positive refractive force, an M1 lens group having a negative refractive force, and a positive refractive force in order from the object side. It consists of an M2 lens group, an RN lens group composed of one lens group and having a negative refractive force, and a subsequent lens group composed of one lens group. The distance between the groups changes, the distance between the M1 lens group and the M2 lens group changes, the distance between the M2 lens group and the RN lens group changes, and the RN lens group and the subsequent lens group change. When the distance between the M1 lens groups is composed of a plurality of lens groups, the distance between adjacent lens groups in the M1 lens group is changed, and when the M2 lens group is composed of a plurality of lens groups. The distance between adjacent lens groups in the M2 lens group changes, and when the magnification is changed from the wide-angle end state to the telephoto end state, the front lens group moves to the object side, and the lens group moves from an infinity object to a short-range object. At the time of focusing, the RN lens group moves and has a negative meniscus lens with a concave surface facing the object side adjacent to the image side of the RN lens group, and the subsequent lens group is negative in order from the object side. It has a lens having a refractive power of the above and a lens having a positive refractive power, and satisfies the following conditional expression.
0.90 <(-fN) /fP <2.00
3.20 <f1 / fTM2 <5.00
However, fN: the focal length of the lens having the strongest negative refractive force in the trailing lens group fP: the focal length of the lens having the strongest positive refractive force in the trailing lens group f1: the focal length of the front lens group fTM2 : Focal length of the M2 lens group in the telephoto end state

The optical device according to the present invention is configured to include the variable magnification optical system.

It is a figure which shows the lens structure of the variable magnification optical system which concerns on 1st Example of this Embodiment. FIG. 2A is an aberration diagram at the time of infinity focusing in the wide-angle end state of the variable magnification optical system according to the first embodiment, and FIG. 2B is image stabilization for rotational blur of 0.30 °. It is a meridional lateral aberration diagram (coma aberration diagram) at the time of performing. It is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system according to the first embodiment. FIG. 4A is an aberration diagram at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the first embodiment, and FIG. 4B is image stabilization for rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of performing. 5 (a), 5 (b), and 5 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first embodiment, respectively, at the time of short-distance focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 2nd Example of this Embodiment. FIG. 7A is an aberration diagram at infinity focusing in the wide-angle end state of the variable magnification optical system according to the second embodiment, and FIG. 7B is image stabilization for rotational blur of 0.30 °. It is a meridional lateral aberration diagram at the time of performing. It is a diagram of various aberrations at the time of infinity focusing in the intermediate focal length state of the variable magnification optical system according to the second embodiment. FIG. 9A is an aberration diagram at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the second embodiment, and FIG. 9B is image stabilization for rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of performing. 10 (a), 10 (b), and 10 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the second embodiment, respectively, at the time of short-distance focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 3rd Example of this Embodiment. FIG. 12 (a) is an aberration diagram at infinity focusing in the wide-angle end state of the variable magnification optical system according to the third embodiment, and FIG. 12 (b) is image stabilization for rotational blur of 0.30 °. It is a meridional lateral aberration diagram at the time of performing. It is a diagram of various aberrations at the time of infinity focusing in the intermediate focal length state of the variable magnification optical system according to the third embodiment. FIG. 14A is a diagram of various aberrations at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the third embodiment, and FIG. 14B is image stabilization for rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of performing. 15 (a), 15 (b), and 15 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 4th Embodiment of this Embodiment. FIG. 17A is an aberration diagram at infinity focusing in the wide-angle end state of the variable magnification optical system according to the fourth embodiment, and FIG. 17B is image stabilization for rotational blur of 0.30 °. It is a meridional lateral aberration diagram at the time of performing. It is a diagram of various aberrations at the time of infinity focusing in the intermediate focal length state of the variable magnification optical system according to the fourth embodiment. FIG. 19A is a diagram of various aberrations at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the fourth embodiment, and FIG. 19B is image stabilization for rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of performing. 20 (a), 20 (b), and 20 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fourth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 5th Embodiment of this Embodiment. FIG. 22A is a diagram of various aberrations at the time of infinity focusing in the wide-angle end state of the variable magnification optical system according to the fifth embodiment, and FIG. 22B is a blurring with respect to a rotational blur of 0.30 °. It is a meridional lateral aberration diagram at the time of correction. It is a diagram of various aberrations at the time of infinity focusing in the intermediate focal length state of the variable magnification optical system according to the fifth embodiment. FIG. 24A is a diagram of various aberrations at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the fifth embodiment, and FIG. 24B is a blurring with respect to a rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of correction. 25 (a), 25 (b), and 25 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 6th Embodiment of this Embodiment. FIG. 27 (a) is a diagram of various aberrations at the time of infinity focusing in the wide-angle end state of the variable magnification optical system according to the sixth embodiment, and FIG. 27 (b) is a blur with respect to a rotational blur of 0.30 °. It is a meridional lateral aberration diagram at the time of correction. It is a diagram of various aberrations at the time of infinity focusing in the intermediate focal length state of the variable magnification optical system according to the sixth embodiment. FIG. 29 (a) is an aberration diagram at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the sixth embodiment, and FIG. 29 (b) is a blur with respect to a rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of correction. 30 (a), 30 (b), and 30 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 7th Example of this Embodiment. FIG. 32 (a) is a diagram of various aberrations at infinity focusing in the wide-angle end state of the variable magnification optical system according to the seventh embodiment, and FIG. 32 (b) shows blurring with respect to rotational blurring of 0.30 °. It is a meridional lateral aberration diagram at the time of correction. It is a diagram of various aberrations at the time of infinity focusing in the intermediate focal length state of the variable magnification optical system according to the seventh embodiment. FIG. 34 (a) is a diagram of various aberrations at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the seventh embodiment, and FIG. 34 (b) is a blur with respect to a rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of correction. 35 (a), 35 (b), and 35 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 8th Embodiment of this Embodiment. FIG. 37 (a) is a diagram of various aberrations at the time of infinity focusing in the wide-angle end state of the variable magnification optical system according to the eighth embodiment, and FIG. 37 (b) shows blur with respect to rotational blur of 0.30 °. It is a meridional lateral aberration diagram at the time of correction. It is a diagram of various aberrations at the time of infinity focusing in the intermediate focal length state of the variable magnification optical system according to the eighth embodiment. FIG. 39 (a) is a diagram of various aberrations at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the eighth embodiment, and FIG. 39 (b) is a blur with respect to a rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of correction. 40 (a), 40 (b), and 40 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on the 9th Example of this Embodiment. FIG. 42 (a) is an aberration diagram at the time of infinity focusing in the wide-angle end state of the variable magnification optical system according to the ninth embodiment, and FIG. 42 (b) is a blur with respect to a rotational blur of 0.30 °. It is a meridional lateral aberration diagram at the time of correction. 9 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system according to the ninth embodiment. FIG. 44 (a) is a diagram of various aberrations at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the ninth embodiment, and FIG. 44 (b) is a blur with respect to a rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of correction. 45 (a), 45 (b), and 45 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the ninth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 10th Embodiment of this Embodiment. FIG. 47 (a) is a diagram of various aberrations at the time of infinity focusing in the wide-angle end state of the variable magnification optical system according to the tenth embodiment, and FIG. 47 (b) is a blur with respect to a rotational blur of 0.30 °. It is a meridional lateral aberration diagram at the time of correction. It is a diagram of various aberrations at the time of infinity focusing in the intermediate focal length state of the variable magnification optical system according to the tenth embodiment. FIG. 49A is a diagram of various aberrations at the time of infinity focusing in the telephoto end state of the variable magnification optical system according to the tenth embodiment, and FIG. 49B is a blurring with respect to a rotational blur of 0.20 °. It is a meridional lateral aberration diagram at the time of correction. 50 (a), 50 (b), and 50 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the tenth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on the eleventh embodiment of this embodiment. 52 (a), 52 (b), and 52 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eleventh embodiment, respectively. It is a diagram of various aberrations of. 53 (a), 53 (b), and 53 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eleventh embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on the twelfth embodiment of this embodiment. 55 (a), 55 (b), and 55 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the twelfth embodiment, respectively. It is a diagram of various aberrations of. 56 (a), 56 (b), and 56 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the twelfth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the lens structure of the variable magnification optical system which concerns on the thirteenth embodiment of this embodiment. 58 (a), 58 (b), and 58 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the thirteenth embodiment, respectively. It is a diagram of various aberrations of. 59 (a), 59 (b), and 59 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the thirteenth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of. It is a figure which shows the structure of the camera provided with the variable magnification optical system which concerns on this embodiment. It is a flowchart which shows the manufacturing method of the variable magnification optical system which concerns on this embodiment.

Hereinafter, the variable magnification optical system, the optical device, and the image pickup device of the present embodiment will be described with reference to the drawings. As shown in FIG. 1, the variable magnification optical system ZL (1) as an example of the variable magnification optical system (zoom lens) ZL according to the present embodiment has a front lens group GFS having a positive refractive force in order from the object side. It has an M1 lens group GM1 having a negative refractive power, an M2 lens group GM2 having a positive refractive power, an RN lens group GRN having a negative refractive power, and a subsequent lens group GRS, and at the time of scaling. , The distance between the front lens group GFS and the M1 lens group GM1 changes, the distance between the M1 lens group GM1 and the M2 lens group GM2 changes, the distance between the M2 lens group GM2 and the RN lens group GRN changes, and is infinite. The RN lens group GRN moves when focusing from a distant object to a short-range object.

The variable-magnification optical system ZL according to the present embodiment includes the variable-magnification optical system ZL (2) shown in FIG. 6, the variable-magnification optical system ZL (3) shown in FIG. 11, and the variable-magnification optical system ZL shown in FIG. 4), the variable magnification optical system ZL (5) shown in FIG. 21, the variable magnification optical system ZL (6) shown in FIG. 26, the variable magnification optical system ZL (7) shown in FIG. 31, and FIG. 36. The variable magnification optical system ZL (8), the variable magnification optical system ZL (9) shown in FIG. 41, the variable magnification optical system ZL (10) shown in FIG. 46, and the variable magnification optical system ZL (11) shown in FIG. 51. Alternatively, the variable magnification optical system ZL (12) shown in FIG. 54 or the variable magnification optical system ZL (13) shown in FIG. 57 may be used.

The variable magnification optical system of the present embodiment has at least five lens groups, and by changing the distance between each lens group at the time of scaling from the wide-angle end state to the telephoto end state, good aberration correction at the time of scaling is performed. Can be planned. Further, by focusing with the RN lens group GRN, the lens group for focusing can be made smaller and lighter. Further, the same effect can be obtained by the manufacturing method of the optical device, the image pickup device, and the variable magnification optical system according to the present embodiment.

In the present embodiment, the succeeding lens group GRS may have a lens having a negative refractive power and a lens having a positive refractive power in order from the object side. This makes it possible to effectively correct various aberrations such as coma.

Further, it is preferable to configure the variable magnification optical system so as to satisfy the following conditional expression (1).
0.70 <(-fN) /fP <2.00 ... (1)
however,
fN: Focal length of the lens with the strongest negative power in the trailing lens group GRS fP: Focal length of the lens with the strongest positive power in the trailing lens group GRS

The above conditional equation (1) is the focal length of the lens having the strongest negative power on the image side of the succeeding lens group GRS and the focal length of the lens having the strongest positive power on the image side of the trailing lens group GRS. It defines the ratio of. By satisfying this conditional equation (1), various aberrations such as coma can be effectively corrected.

When the corresponding value of the above conditional expression (1) exceeds the upper limit value, the refractive power of the lens having a positive refractive power on the image side of the in-focus lens group becomes strong, and the occurrence of coma aberration becomes excessive. By setting the upper limit value of the conditional expression (1) to 1.90, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (1) to 1.80.

When the corresponding value of the above conditional expression (1) is less than the lower limit value, the refractive power of the lens having a negative refractive power on the image side of the in-focus lens group becomes strong, and the correction of coma aberration becomes excessive. By setting the lower limit of the conditional expression (1) to 0.80, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit value of the conditional expression (1) to 0.90.

In the present embodiment, it is preferable that the front lens group GFS moves toward the object when the magnification is changed from the wide-angle end state to the telephoto end state. As a result, the total length of the lens can be shortened in the wide-angle end state, and the variable magnification optical system can be miniaturized.

In the present embodiment, the RN lens group GRN preferably has at least one lens having a positive refractive power and at least one lens having a negative refractive power.

In the present embodiment, it is preferable that the variable magnification optical system satisfies the following conditional expression (2).
0.15 <(-fTM1) /f1 <0.35 ... (2)
however,
fTM1: Focal length of M1 lens group GM1 in the telephoto end state f1: Focal length of front lens group GFS

Conditional expression (2) defines the ratio between the focal length of the M1 lens group GM1 and the focal length of the front lens group GFS in the telephoto end state. By satisfying this conditional equation (2), it is possible to suppress fluctuations in various aberrations such as spherical aberration when scaling from the wide-angle end to the telephoto end.

When the corresponding value of the conditional expression (2) exceeds the upper limit value, the refractive power of the front lens group GFS becomes stronger, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are corrected. Becomes difficult. By setting the upper limit value of the conditional expression (2) to 0.33, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (2) to 0.31.

When the corresponding value of the above conditional expression (2) is less than the lower limit value, the refractive power of the M1 lens group GM1 becomes stronger, and fluctuations of various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are caused. It becomes difficult to suppress. By setting the lower limit of the conditional expression (2) to 0.16, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit value of the conditional expression (2) to 0.17.

In the present embodiment, it is preferable that the variable magnification optical system satisfies the following conditional expression (3).
0.20 <fTM2 / f1 <0.40 ... (3)
however,
fTM2: Focal length of M2 lens group GM2 in the telephoto end state f1: Focal length of front lens group GFS

The conditional equation (3) defines the ratio between the focal length of the M2 lens group GM2 and the focal length of the front lens group GFS in the telephoto end state. By satisfying this conditional equation (3), it is possible to suppress fluctuations in various aberrations such as spherical aberration when scaling from the wide-angle end to the telephoto end.

When the corresponding value of the above conditional expression (3) exceeds the upper limit value, the refractive power of the front lens group GFS becomes stronger, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are corrected. Will be difficult. By setting the upper limit value of the conditional expression (3) to 0.37, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (3) to 0.34.

When the corresponding value of the above conditional expression (3) is less than the lower limit value, the refractive power of the M2 lens group GM2 becomes stronger, and fluctuations of various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are caused. It becomes difficult to suppress. By setting the lower limit value of the conditional expression (3) to 0.22, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit value of the conditional expression (3) to 0.24.

In the present embodiment, it is preferable to have a negative meniscus lens with a concave surface facing the object side adjacent to the image side of the RN lens group GRN. This makes it possible to effectively correct various aberrations such as coma.

In the present embodiment, it is preferable that the variable magnification optical system satisfies the following conditional expression (4).
1.80 <f1 / fw <3.50 ... (4)
however,
f1: Focal length of front lens group GFS fw: Focal length of variable magnification optical system in wide-angle end state

Conditional expression (4) defines the ratio between the focal length of the front lens group GFS and the focal length of the variable magnification optical system in the wide-angle end state. By satisfying this conditional equation (4), it is possible to prevent the lens barrel from becoming large in size and suppress fluctuations in various aberrations such as spherical aberration when scaling from the wide-angle end to the telephoto end.

When the corresponding value of the above conditional expression (4) exceeds the upper limit value, the refractive power of the front lens group GFS becomes weak and the lens barrel becomes large. By setting the upper limit value of the conditional expression (4) to 3.30, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (4) to 3.10.

When the corresponding value of the above conditional expression (4) is less than the lower limit value, the refractive power of the front lens group GFS becomes strong, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are corrected. Will be difficult. By setting the lower limit of the conditional expression (4) to 1.90, the effect of the present embodiment can be further ensured. In order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (4) to 2.00, and it is more preferable to set the lower limit value of the conditional expression (4) to 2.10. preferable.

In the present embodiment, it is preferable that the variable magnification optical system satisfies the following conditional expression (5).
3.70 <f1 / (-fTM1) <5.00 ... (5)
however,
f1: Focal length of the front lens group GFS fTM1: Focal length of the M1 lens group GM1 in the telephoto end state

Conditional expression (5) defines the ratio between the focal length of the front lens group GFS and the focal length of the M1 lens group GM1. By satisfying this conditional equation (5), it is possible to suppress fluctuations in various aberrations such as spherical aberration when scaling from the wide-angle end to the telephoto end.

When the corresponding value of the above conditional expression (5) exceeds the upper limit value, the refractive power of the M1 lens group GM1 becomes stronger, and fluctuations of various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are caused. It becomes difficult to suppress. By setting the upper limit value of the conditional expression (5) to 4.90, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (5) to 4.80.

When the corresponding value of the above conditional expression (5) is less than the lower limit value, the refractive power of the front lens group GFS becomes strong, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are corrected. Will be difficult. By setting the lower limit of the conditional expression (5) to 3.90, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit of the conditional expression (5) to 3.95.

In the present embodiment, it is preferable that the variable magnification optical system satisfies the following conditional expression (6).
3.20 <f1 / fTM2 <5.00 ... (6)
however,
f1: Focal length of front lens group GFS fTM2: Focal length of M2 lens group GM2 in the telephoto end state

The conditional expression (6) defines the ratio between the focal length of the front lens group GFS and the focal length of the M2 lens group GM2. By satisfying this conditional equation (6), it is possible to suppress fluctuations in various aberrations such as spherical aberration when scaling from the wide-angle end to the telephoto end.

When the corresponding value of the above conditional expression (6) exceeds the upper limit value, the refractive power of the M2 lens group GM2 becomes stronger, and fluctuations of various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are caused. It becomes difficult to suppress. By setting the upper limit value of the conditional expression (6) to 4.80, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (6) to 4.60.

When the corresponding value of the above conditional expression (6) is less than the lower limit value, the refractive power of the front lens group GFS becomes strong, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are corrected. Will be difficult. By setting the lower limit of the conditional expression (6) to 3.40, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit of the conditional expression (6) to 3.60.

In the present embodiment, it is preferable that the lens group closest to the object side in the M1 lens group GM1 is fixed to the image plane at the time of scaling. As a result, performance deterioration due to manufacturing errors can be suppressed and mass productivity can be ensured.

In the present embodiment, it is preferable that the M2 lens group GM2 has a vibration-proof lens group that can move in a direction orthogonal to the optical axis in order to correct the image formation position displacement due to camera shake or the like. By arranging the anti-vibration lens group in the M2 lens group GM2 in this way, it is possible to effectively suppress the performance deterioration when the image stabilization is performed.

In the present embodiment, the anti-vibration lens group is preferably composed of a lens having a negative refractive power and a lens having a positive refractive power in order from the object side. As a result, it is possible to effectively suppress performance deterioration when image stabilization is performed.

In the present embodiment, it is preferable that the variable magnification optical system satisfies the following conditional expression (7).
1.00 <nvrN / nvrP <1.25 ... (7)
however,
nvrN: Refractive index of the lens having a negative refractive index in the anti-vibration lens group nvrP: Refractive index of the lens having a positive refractive index in the anti-vibration lens group

The conditional expression (7) is a combination of the refractive index of the lens having a negative refractive index in the anti-vibration lens group provided in the M2 lens group GM2 and the refractive index of the lens having a positive refractive index in the anti-vibration lens group. It defines the ratio. By satisfying this conditional expression (7), it is possible to effectively suppress performance deterioration when image stabilization is performed.

When the corresponding value of the conditional equation (7) exceeds the upper limit value, the refractive index of the lens having a positive refractive power in the anti-vibration lens group becomes low, and the eccentric coma aberration generated when the image stabilization is performed. Occurrence becomes excessive and it becomes difficult to correct. By setting the upper limit value of this conditional expression (7) to 1.22, the effect of this embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (7) to 1.20.

When the corresponding value of the above conditional expression (7) is within this range, the refractive index of the lens having a negative refractive power in the anti-vibration lens group is appropriate, and the eccentric coma aberration when blur correction is performed. Is well corrected and is preferable. By setting the lower limit value of the conditional expression (7) to 1.03, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit value of the conditional expression (7) to 1.05.

In the present embodiment, it is preferable that the variable magnification optical system satisfies the following conditional expression (8).
0.30 <νvrN / νvrP <0.90 ... (8)
however,
νvrN: Abbe number of lenses having a negative refractive power in the anti-vibration lens group νvrP: Abbe number of lenses having a positive refractive power in the anti-vibration lens group

Conditional expression (8) defines the ratio of the Abbe number of the lens having a negative refractive power in the anti-vibration lens group to the Abbe number of the lens having a positive refractive power in the anti-vibration lens group. By satisfying this conditional expression (8), it is possible to effectively suppress performance deterioration when image stabilization is performed.

When the corresponding value of the conditional expression (8) is within this range, the Abbe number of the lens having a positive refractive power in the anti-vibration lens group is appropriate, and the chromatic aberration generated when the image stabilization is performed is good. It is corrected to and is preferable. By setting the upper limit value of the conditional expression (8) to 0.85, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (8) to 0.80.

When the corresponding value of the conditional expression (8) is less than the lower limit value, the Abbe number of the lens having a negative refractive power in the anti-vibration lens group becomes small, and it is difficult to correct the chromatic aberration generated when the image stabilization is performed. Become. By setting the lower limit of the conditional expression (8) to 0.35, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit value of the conditional expression (8) to 0.40.

In the present embodiment, it is also preferable that the M1 lens group GM1 has a vibration-proof lens group that can move in a direction orthogonal to the optical axis in order to correct the image formation position displacement due to camera shake or the like. In this case, it is preferable that the anti-vibration lens group includes a lens having a negative refractive power and a lens having a positive refractive power in this order from the object side.

In the present embodiment, it is preferable that the variable magnification optical system satisfies the following conditional expression (9).
0.80 <nvrN / nvrP <1.00 ... (9)
however,
nvrN: Refractive index of the lens having a negative refractive index in the anti-vibration lens group nvrP: Refractive index of the lens having a positive refractive index in the anti-vibration lens group

Conditional expression (9) sets the refractive index of the lens having a negative refractive index in the anti-vibration lens group provided in the M1 lens group GM1 and the positive refractive index in the anti-vibration lens group provided in the M1 lens group GM1. It defines the ratio to the refractive index of the lens it has. By satisfying this conditional expression (9), it is possible to effectively suppress performance deterioration when image stabilization is performed.

When the corresponding value of the above conditional expression (9) exceeds the upper limit value, the refractive index of the lens having a positive refractive power in the anti-vibration lens group provided in the M1 lens group GM1 becomes low, and when blur correction is performed, the refractive index becomes low. It becomes difficult to correct the eccentric coma that occurs. By setting the upper limit value of the conditional expression (9) to 0.98, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (9) to 0.96.

When the corresponding value of the above conditional expression (9) is less than the lower limit value, the refractive index of the lens having a negative refractive power in the anti-vibration lens group provided in the M1 lens group GM1 becomes low, and when blur correction is performed, the refractive index becomes low. It becomes difficult to correct the eccentric coma that occurs. By setting the lower limit of the conditional expression (9) to 0.82, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit value of the conditional expression (9) to 0.84.

In the present embodiment, it is preferable that the variable magnification optical system satisfies the following conditional expression (10).
1.20 <νvrN / νvrP <2.40 ... (10)
however,
νvrN: Abbe number of lenses having a negative refractive power in the anti-vibration lens group νvrP: Abbe number of lenses having a positive refractive power in the anti-vibration lens group

In the conditional equation (10), the Abbe number of the lens having a negative refractive power in the anti-vibration lens group provided in the M1 lens group GM1 and the positive refractive power in the anti-vibration lens group provided in the M1 lens group GM1 are obtained. It defines the ratio of the lens to the Abbe number. By satisfying this conditional expression (10), it is possible to effectively suppress performance deterioration when image stabilization is performed.

When the corresponding value of the above conditional expression (10) exceeds the upper limit value, the Abbe number of the lens having a positive refractive power in the anti-vibration lens group provided in the M1 lens group GM1 becomes too small, so that blur correction is performed. It becomes difficult to correct the chromatic aberration that occurs at that time. By setting the upper limit value of the conditional expression (10) to 2.30, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (10) to 2.20.

When the corresponding value of the above conditional expression (10) is less than the lower limit value, the Abbe number of the lens having a negative refractive power in the anti-vibration lens group provided in the M1 lens group GM1 becomes too small, so that blur correction is performed. It becomes difficult to correct the chromatic aberration that occurs at that time. By setting the lower limit of the conditional expression (10) to 1.30, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit of the conditional expression (10) to 1.40.

In the present embodiment, the subsequent lens group GRS preferably has a lens having a positive refractive power. This makes it possible to effectively correct various aberrations such as coma.

In this case, it is preferable that the variable magnification optical system satisfies the conditional expression (2).
0.15 <(-fTM1) /f1 <0.35 ... (2)
The conditional expression (2) is the same as that described above, and the description thereof is as described above.

Even in this case, when the corresponding value of the conditional expression (2) exceeds the upper limit value, the refractive power of the front lens group GFS becomes stronger, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end become stronger. It becomes difficult to correct the aberration. By setting the upper limit value of the conditional expression (2) to 0.33, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (2) to 0.31.

Further, when the corresponding value of the above conditional expression (2) is less than the lower limit value, the refractive power of the M1 lens group GM1 becomes stronger, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end become stronger. It becomes difficult to suppress fluctuations. By setting the lower limit of the conditional expression (2) to 0.16, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit value of the conditional expression (2) to 0.17.

In the above case, it is preferable that the variable magnification optical system satisfies the following conditional expression (3).
0.20 <fTM2 / f1 <0.40 ... (3)
This conditional expression (3) is the same as that described above, and the description thereof is as described above.

Even in this case, when the corresponding value of the above conditional expression (3) exceeds the upper limit value, the refractive power of the front lens group GFS becomes strong, including spherical aberration at the time of scaling from the wide-angle end to the telephoto end. It becomes difficult to correct various aberrations. By setting the upper limit value of the conditional expression (3) to 0.37, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (3) to 0.34.

When the corresponding value of the above conditional expression (3) is less than the lower limit value, the refractive power of the M2 lens group GM2 becomes stronger, and fluctuations of various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are caused. It becomes difficult to suppress. By setting the lower limit value of the conditional expression (3) to 0.22, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit value of the conditional expression (3) to 0.24.

In the above case, it is preferable that the variable magnification optical system satisfies the following conditional expression (4).
1.80 <f1 / fw <3.50 ... (4)
This conditional expression (4) is the same as that described above, and the description thereof is as described above.

Even in this case, if the corresponding value of the conditional expression (4) exceeds the upper limit value, the refractive power of the front lens group GFS becomes weak and the lens barrel becomes large. By setting the upper limit value of the conditional expression (4) to 3.30, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (4) to 3.10.

When the corresponding value of the above conditional expression (4) is less than the lower limit value, the refractive power of the front lens group GFS becomes strong, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are corrected. Will be difficult. By setting the lower limit of the conditional expression (4) to 1.90, the effect of the present embodiment can be further ensured. In order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (4) to 2.00, and it is more preferable to set the lower limit value of the conditional expression (4) to 2.10. preferable.

Further, in the above case, it is preferable that the variable magnification optical system satisfies the following conditional expression (5).
3.70 <f1 / (-fTM1) <5.00 ... (5)
This conditional expression (5) is the same as that described above, and the description thereof is as described above.

Even in this case, if the corresponding value of the above conditional expression (5) exceeds the upper limit value, the M1 lens group G
The refractive power of M1 becomes stronger, and it becomes difficult to suppress fluctuations in various aberrations such as spherical aberration when scaling from the wide-angle end to the telephoto end. By setting the upper limit value of the conditional expression (5) to 4.90, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (5) to 4.80.

When the corresponding value of the above conditional expression (5) is less than the lower limit value, the refractive power of the front lens group GFS becomes strong, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are corrected. Will be difficult. By setting the lower limit of the conditional expression (5) to 3.90, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit of the conditional expression (5) to 3.95.

Further, in the above case, it is preferable that the variable magnification optical system satisfies the following conditional expression (6).
3.20 <f1 / fTM2 <5.00 ... (6)
This conditional expression (6) is the same as that described above, and the description thereof is as described above.

Even in this case, when the corresponding value of the above conditional expression (6) exceeds the upper limit value, the refractive power of the M2 lens group GM2 becomes stronger, including spherical aberration at the time of scaling from the wide-angle end to the telephoto end. It becomes difficult to suppress fluctuations in various aberrations. By setting the upper limit value of the conditional expression (6) to 4.80, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the upper limit value of the conditional expression (6) to 4.60.

When the corresponding value of the above conditional expression (6) is less than the lower limit value, the refractive power of the front lens group GFS becomes strong, and various aberrations such as spherical aberration at the time of scaling from the wide-angle end to the telephoto end are corrected. Will be difficult. By setting the lower limit of the conditional expression (6) to 3.40, the effect of the present embodiment can be further ensured. In order to further ensure the effect of this embodiment, it is preferable to set the lower limit of the conditional expression (6) to 3.60.

The optical device and the image pickup device of the present embodiment are configured to include the variable magnification optical system having the above-described configuration. As a specific example thereof, a camera equipped with the above-mentioned variable magnification optical system ZL (corresponding to the image pickup apparatus of the present invention) will be described with reference to FIG. 60. As shown in FIG. 60, the camera 1 has a lens assembly configuration in which the photographing lens 2 is interchangeable, and the photographing lens 2 is provided with a variable magnification optical system having the above-mentioned configuration. That is, the photographing lens 2 corresponds to the optical device of the present invention. The camera 1 is a digital camera, and light from an object (subject) (not shown) is collected by the photographing lens 2 and reaches the image pickup element 3. As a result, the light from the subject is captured by the image sensor 3 and recorded as a subject image in a memory (not shown). In this way, the photographer can shoot the subject with the camera 1. This camera may be a mirrorless camera or a single-lens reflex type camera having a quick return mirror.

With the above configuration, the camera 1 equipped with the variable magnification optical system ZL on the photographing lens 2 can be used for high-speed AF and AF without increasing the size of the lens barrel by reducing the size and weight of the focusing lens group. Quietness can be achieved. Further, it is possible to satisfactorily suppress the aberration fluctuation at the time of scaling from the wide-angle end state to the telephoto end state and the aberration fluctuation at the time of focusing from the infinity object to the short-distance object, and to realize good optical performance.

Subsequently, the method for manufacturing the above-mentioned variable magnification optical system ZL will be outlined with reference to FIG. 61. First, in order from the object side, the front lens group GFS having a positive refractive power, the M1 lens group GM1 having a negative refractive power, the M2 lens group GM2 having a positive refractive power, and the RN having a negative refractive power. The lens group GRN and the succeeding lens group GRS are arranged (step ST1). Then, at the time of scaling, the distance between the front lens group GFS and the M1 lens group GM1 changes, and the M1 lens group G
The distance between the M1 and the M2 lens group GM2 changes, and the distance between the M2 lens group GM2 and the RN lens group GRN changes (step ST2). At this time, the RN lens group GRN is configured to move when focusing from an infinity object to a short-range object (step ST3), and the succeeding lens group GRS has a negative refractive power in order from the object side. It is configured to have a lens and a lens having a positive refractive power (step ST4). Further, each lens is arranged so as to satisfy a predetermined conditional expression (step ST5).

Hereinafter, the variable magnification optical system (zoom lens) ZL according to the embodiment of the present embodiment will be described with reference to the drawings. 1, FIG. 6, FIG. 11, FIG. 16, FIG. 21, FIG. 26, FIG. 31, FIG. 36, FIG. 41, FIG. 46, FIG. 51, FIG. 54, and FIG. 57 are modifications according to the first to thirteenth embodiments. It is sectional drawing which shows the structure and the refractive power distribution of a double optical system ZL {ZL (1)-ZL (13)}. At the bottom of the cross-sectional view of the variable magnification optical system ZL (1) to ZL (13), the movement along the optical axis of each lens group when scaling from the wide-angle end state (W) to the telephoto end state (T). The direction is indicated by an arrow. Further, the moving direction when the focusing group GRN focuses on a short-distance object from infinity is indicated by an arrow together with the character "focusing".

In FIG. 1, FIG. 6, FIG. 11, FIG. 16, FIG. 21, FIG. 26, FIG. 31, FIG. 36, FIG. 41, FIG. 46, FIG. 51, FIG. 54, and FIG. Each lens is represented by a combination of letters L and a number by a combination of alphabets. In this case, in order to prevent the types and numbers of codes and numbers from becoming large and complicated, the lens group and the like are represented by independently using combinations of codes and numbers for each embodiment. Therefore, even if the same combination of reference numerals and numbers is used between the examples, it does not mean that they have the same configuration.

Tables 1 to 13 are shown below, and among them, Tables 1 to 13 are tables showing each specification data in each of the first embodiment to the thirteenth embodiment. In each embodiment, the d-line (wavelength 587.562 nm) and the g-line (wavelength 435.835 nm) are selected as the calculation targets of the aberration characteristics.

In the [Lens Specifications] table, the plane numbers indicate the order of the optical planes from the object side along the traveling direction of the light beam, and R is the radius of curvature of each optical plane (the plane whose center of curvature is located on the image side). (Positive value), D is the distance on the optical axis from each optical surface to the next optical surface (or image surface), nd is the refractive index of the material of the optical member with respect to the d line, and νd is optical. The Abbe number based on the d-line of the material of the member is shown. The object surface indicates an object surface, an "∞" of radius of curvature indicates a plane or an aperture, (aperture S) indicates an aperture stop S, and an image surface indicates an image surface I. The description of the refractive index nd of air = 1.00000 is omitted.

In the [Various data] table, f is the focal length of the entire lens system, FNO is the F number, 2ω is the angle of view (unit is ° (degrees), and ω is the half angle of view), and Ymax is the maximum image height. show. TL indicates the distance from the frontmost surface of the lens to the final surface of the lens on the optical axis at infinity, plus BF, and BF is the image from the final surface of the lens on the optical axis at infinity. The distance to the surface I (back focus) is shown. These values are shown for each of the wide-angle end (W), intermediate focal length (M), and telephoto end (T) in each variable magnification state.

The table of [variable spacing data] is the surface number in which the surface spacing is "variable" in the table showing [lens specifications] (for example, surface numbers 5, 13, 25, 29 in the first embodiment). Indicates the surface spacing of. Here, the plane spacings at the wide-angle end (W), the intermediate focal length (M), and the telephoto end (T) are shown for each of the focused states at infinity and short distance.

In the table of [lens group data], the start surface (the surface on the most object side) and the focal length of each of the first to fifth lens groups (or the sixth lens group) are shown.

The table of [Conditional expression corresponding values] shows the values corresponding to the above conditional expressions (1) to (10). At this time, not all the examples correspond to all the conditional expressions, so the values of the corresponding conditional expressions are shown in each embodiment.

Hereinafter, in all the specification values, "mm" is generally used for the focal length f, the radius of curvature R, the plane spacing D, other lengths, etc., unless otherwise specified, but the optical system is expanded proportionally. Alternatively, it is not limited to this because the same optical performance can be obtained even if the proportional reduction is performed.

The description of the table so far is common to all the examples, and the duplicate description below is omitted.

(First Example)
The first embodiment will be described with reference to FIGS. 1 and 1. FIG. 1 is a diagram showing a lens configuration of a variable magnification optical system according to the first embodiment of the present embodiment. The variable magnification optical system ZL (1) according to the present embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a first lens group having a positive refractive power in order from the object side. It is composed of three lens groups G3, a fourth lens group G4 having a negative power, and a fifth lens group G5 having a positive power. The symbol (+) or (−) attached to each lens group symbol indicates the refractive power of each lens group, and this also applies to all the following examples.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 includes a regular convex flat lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side. Consists of a bonded positive lens.

The second lens group G2 has a negative meniscus lens L21 with a convex surface facing the object side, a biconvex positive lens L22, a biconcave negative lens L23, and a concave surface facing the object side in order from the object side. It is composed of a negative meniscus lens L24.

The third lens group G3 is a junction positive lens of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32, and a biconvex positive lens L33 and a biconcave shape in order from the object side. From the bonded positive lens with the negative lens L34, the aperture aperture S, the bonded negative lens between the negative meniscus lens L35 with the convex surface facing the object side and the biconvex positive lens L36, and the biconvex positive lens L37. It is composed.

The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a negative lens L42 having both concave shapes in order from the object side.

The fifth lens group G5 is composed of a negative meniscus lens L51 having a concave surface facing the object side and a biconvex positive lens L52 in order from the object side.

In the optical system according to the present embodiment, focusing of a long-distance object to a short-distance object is performed by moving the fourth lens group G4 in the image plane direction.

In the variable magnification optical system according to the present embodiment, a junction positive lens of a negative meniscus lens L31 having a convex surface facing the object side constituting the third lens group G3 (M2 lens group GM2) and a biconvex positive lens L32 is used. By moving the lens in a direction orthogonal to the optical axis, the displacement of the image formation position due to camera shake or the like is corrected (vibration-proof).

To correct rotational blur at an angle θ with a lens whose focal length of the entire system is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K, The moving lens group for image stabilization may be moved in the direction orthogonal to the optical axis by (f · tan θ) / K. At the wide-angle end of the first embodiment, the anti-vibration coefficient is 1.65 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is 0.23 mm. In the telephoto end state of the first embodiment, the anti-vibration coefficient is 2.10 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is 0.49 mm.

Table 1 below lists the values of the specifications of the optical system according to this embodiment. In Table 1, f indicates the focal length and BF indicates the back focus.

(Table 1) First Example
[Lens specifications]
Surface number R D nd νd
Physical surface ∞
1 109.4870 4.600 1.48749 70.31
2 ∞ 0.200
3 101.1800 1.800 1.62004 36.40
4 49.8109 7.200 1.49700 81.61
5 385.8166 Variable
6 176.0187 1.700 1.69680 55.52
7 31.3680 5.150
8 32.6087 5.500 1.78472 25.64
9 -129.7634 1.447
10 -415.4105 1.300 1.77250 49.62
11 34.3083 4.300
12 -33.1502 1.200 1.85026 32.35
13 -203.5644 Variable
14 70.9040 1.200 1.80100 34.92
15 30.2785 5.900 1.64000 60.20
16 -70.1396 1.500
17 34.0885 6.000 1.48749 70.31
18 -42.6106 1.300 1.80610 40.97
19 401.2557 2.700
20 ∞ 14.110 (Aperture S)
21 350.0000 1.200 1.83400 37.18
22 30.1592 4.800 1.51680 63.88
23 -94.9908 0.200
24 66.3243 2.800 1.80100 34.92
25 -132.5118 Variable
26 -92.0997 2.200 1.80518 25.45
27 -44.0090 6.500
28 -36.9702 1.000 1.77250 49.62
29 68.3346 Variable
30 -24.5000 1.400 1.62004 36.40
31 -41.1519 0.200
32 106.0000 3.800 1.67003 47.14
33 -106.0000 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 100.0 292.0
FNO 4.49 4.86 5.88
2ω 33.96 24.48 8.44
Ymax 21.60 21.60 21.60
TL 190.13 205.07 245.82
BF 39.12 46.45 67.12

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 6.204 21.150 61.895 6.204 21.150 61.895
d13 30.000 22.666 2.000 30.000 22.666 2.000
d25 2.180 3.742 3.895 2.837 4.562 5.614
d29 21.418 19.856 19.703 20.761 19.036 17.984

[Lens group data]
Group start surface f
G1 1 145.319
G2 6 -29.546
G3 14 38.298
G4 26 -48.034
G5 30 324.470

[Conditional expression correspondence value]
(1) (-fN) / fP = 1.266
(2) (-fTM1) / f1 = 0.203
(3) fTM2 / f1 = 0.264
(4) f1 / fw = 2.016
(5) f1 / (-fTM1) = 4.918
(6) f1 / fTM2 = 3.794
(7) nvrN / nvrP = 1.098
(8) νvrN / νvrP = 0.580

2 (a) and 2 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the vibration isolation function according to the first embodiment, and rotation of 0.30 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the blur. FIG. 3 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the first embodiment. 4 (a) and 4 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the first embodiment, and 0.20 ° rotation, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the blur. 5 (a), 5 (b), and 5 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first embodiment, respectively, at the time of short-distance focusing. It is a diagram of various aberrations of.

In each aberration diagram of FIGS. 2 to 5, FNO indicates an F number, NA indicates a numerical aperture, and Y indicates an image height. The spherical aberration diagram shows the F number or numerical aperture value corresponding to the maximum aperture, the astigmatism diagram and the distortion diagram show the maximum image height, and the coma aberration diagram shows the value of each image height. .. d indicates the d line (λ = 587.6 nm), and g indicates the g line (λ = 435.8 nm). In the astigmatism diagram, the solid line shows the sagittal image plane and the broken line shows the meridional image plane. In the aberration diagram of each embodiment shown below, the same reference numerals as those of this embodiment are used.

From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and even during short-distance focusing. It can be seen that it has excellent imaging performance.

(Second Example)
FIG. 6 is a diagram showing a lens configuration of the variable magnification optical system according to the second embodiment of the present application. In the variable magnification optical system according to the present embodiment, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a negative refractive power. It is composed of a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, and a sixth lens group G6 having a positive refractive power.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 and the third lens group G3 are in the M1 lens group GM1, and the fourth lens group G4 is in the M2 lens group. The fifth lens group G5 corresponds to the RN lens group GRN, and the sixth lens group G6 corresponds to the subsequent lens group GRS in GM2.

The first lens group G1 includes a regular convex flat lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side. Consists of a bonded positive lens.

The second lens group G2 is composed of a negative meniscus lens L21 having a convex surface facing the object side, a biconvex positive lens L22, and a biconcave negative lens L23 in order from the object side.

The third lens group G3 is composed of a negative meniscus lens L31 with a concave surface facing the object side.

The fourth lens group G4 is a junction positive lens of a negative meniscus lens L41 having a convex surface facing the object side and a biconvex positive lens L42, and a biconvex positive lens L43 and a biconcave shape in order from the object side. From the bonded positive lens with the negative lens L44, the aperture aperture S, the bonded negative lens with the negative meniscus lens L45 with the convex surface facing the object side and the biconvex positive lens L46, and the biconvex positive lens L47. It is composed.

The fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side and a negative lens L52 having a biconcave shape in order from the object side.

The sixth lens group G6 is composed of a negative meniscus lens L61 having a concave surface facing the object side and a biconvex positive lens L62 in order from the object side.

In the optical system according to the present embodiment, focusing of a long-distance object to a short-distance object is performed by moving the fifth lens group G5 in the image plane direction. Further, the junction positive lens of the negative meniscus lens L41 having the convex surface facing the object side constituting the fourth lens group G4 (M2 lens group GM2) and the biconvex positive lens L42 is moved in the direction orthogonal to the optical axis. This corrects the image formation position displacement due to camera shake or the like.

To correct rotational blur at an angle θ with a lens whose focal length of the entire system is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K. Is sufficient to move the moving lens group for image stabilization by (f · tan θ) / K in the direction orthogonal to the optical axis. At the wide-angle end of the second embodiment, the anti-vibration coefficient is 1.66 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is 0.23 mm. In the telephoto end state of the second embodiment, the anti-vibration coefficient is 2.10 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is 0.49 mm.

Table 2 below lists the values of the specifications of the optical system according to this embodiment.
(Table 2) Second Example
[Lens specifications]
Surface number R D nd νd
Physical surface ∞
1 107.5723 4.600 1.48749 70.32
2 ∞ 0.200
3 96.9007 1.800 1.62004 36.40
4 47.8324 7.200 1.49700 81.61
5 361.3792 Variable
6 139.8663 1.700 1.69680 55.52
7 33.7621 6.806
8 33.5312 5.500 1.78472 25.64
9 -139.8348 0.637
10 -492.0620 1.300 1.80400 46.60
11 35.1115 Variable
12 -34.6163 1.200 1.83400 37.18
13 -377.1306 Variable
14 74.8969 1.200 1.80100 34.92
15 31.6202 5.900 1.64000 60.19
16 -69.0444 1.500
17 34.2668 6.000 1.48749 70.32
18 -42.8334 1.300 1.80610 40.97
19 434.9585 2.700
20 ∞ 14.312 (Aperture S)
21 350.0000 1.200 1.83400 37.18
22 30.4007 4.800 1.51680 63.88
23 -98.0361 0.200
24 68.9306 2.800 1.80100 34.92
25 -129.3404 Variable
26 -90.5065 2.200 1.80518 25.45
27 -44.1796 6.500
28 -37.6907 1.000 1.77250 49.62
29 68.3000 Variable
30 -24.5545 1.400 1.62004 36.40
31 -41.7070 0.200
32 106.0000 3.800 1.67003 47.14
33 -106.0000 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 100.0 292.0
FNO 4.53 4.89 5.88
2ω 33.98 24.48 8.44
Ymax 21.60 21.60 21.60
TL 190.82 206.02 245.82
BF 39.12 46.27 66.46

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 2.861 18.057 57.861 2.861 18.057 57.861
d11 5.727 5.812 6.883 5.727 5.812 6.883
d13 30.500 23.259 2.000 30.500 23.259 2.000
d25 2.246 3.634 3.634 2.888 4.436 5.329
d29 22.411 21.023 21.023 21.770 20.221 19.329

[Lens group data]
Group start surface f
G1 1 141.867
G2 6 -104.910
G3 12 -45.774
G4 14 38.681
G5 26 -48.266
G6 30 340.779

[Conditional expression correspondence value]
(1) (-fN) / fP = 1.248
(2) (-fTM1) / f1 = 0.208
(3) fTM2 / f1 = 0.273
(4) f1 / fw = 1.968
(5) f1 / (-fTM1) = 4.804
(6) f1 / fTM2 = 3.668
(7) nvrN / nvrP = 1.098
(8) νvrN / νvrP = 0.580

7 (a) and 7 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the anti-vibration function according to the second embodiment, and rotation of 0.30 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the blur. FIG. 8 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the second embodiment. 9 (a) and 9 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the second embodiment, and 0.20 ° rotation, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the blur. 10 (a), 10 (b), and 10 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the second embodiment, respectively, at the time of short-distance focusing. It is a diagram of various aberrations of.

From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and even during short-distance focusing. It can be seen that it has excellent imaging performance.

(Third Example)

FIG. 11 is a diagram showing a lens configuration of a variable magnification optical system according to a third embodiment of the present application. In the variable magnification optical system according to this embodiment, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. It is composed of a fourth lens group G4 having a positive refractive power, a fifth lens group G5 having a negative refractive power, and a sixth lens group G6 having a positive refractive power.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, and the third lens group G3 and the fourth lens group G4 are in the M2 lens group. The fifth lens group G5 corresponds to the RN lens group GRN, and the sixth lens group G6 corresponds to the subsequent lens group GRS in GM2.

The first lens group G1 includes a regular convex flat lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side. Consists of a bonded positive lens.

The second lens group G2 has a negative meniscus lens L21 with a convex surface facing the object side, a biconvex positive lens L22, a biconcave negative lens L23, and a concave surface facing the object side in order from the object side. It is composed of a negative meniscus lens L24.

The third lens group G3 is a junction positive lens of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32, and a biconvex positive lens L33 and a biconcave shape in order from the object side. It is composed of a bonded positive lens with a negative lens L34 and an aperture stop S.

The fourth lens group G4 is composed of a negative meniscus lens L41 having a convex surface facing the object side, a junction negative lens of a biconvex positive lens L42, and a biconvex positive lens L43 in order from the object side. ..

The fifth lens group G5 is composed of a positive meniscus lens L51 having a concave surface facing the object side and a negative lens L52 having a biconcave shape in order from the object side.
The sixth lens group G6 is composed of a negative meniscus lens L61 having a concave surface facing the object side and a biconvex positive lens L62 in order from the object side.

In the optical system according to the present embodiment, focusing of a long-distance object to a short-distance object is performed by moving the fifth lens group G5 in the image plane direction. Further, the junction positive lens of the negative meniscus lens L31 having the convex surface facing the object side constituting the third lens group G3 (M2 lens group GM2) and the biconvex positive lens L32 is moved in the direction orthogonal to the optical axis. This corrects the image formation position displacement due to camera shake or the like.

To correct rotational blur at an angle θ with a lens whose focal length of the entire system is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K. Is sufficient to move the moving lens group for image stabilization by (f · tan θ) / K in the direction orthogonal to the optical axis. At the wide-angle end of the third embodiment, the anti-vibration coefficient is 1.65 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is 0.23 mm. In the telephoto end state of the third embodiment, the anti-vibration coefficient is 2.10 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is 0.49 mm.

Table 3 below lists the values of the specifications of the optical system according to this embodiment.

(Table 3) Third Example
[Lens specifications]
Surface number R D nd νd
Physical surface ∞
1 106.7563 4.600 1.48749 70.32
2 ∞ 0.200
3 99.4635 1.800 1.62004 36.40
4 49.2336 7.200 1.49700 81.61
5 332.7367 Variable
6 152.3830 1.700 1.69680 55.52
7 31.0229 5.695
8 32.0867 5.500 1.78472 25.64
9 -139.5695 1.399
10 -403.4713 1.300 1.77250 49.62
11 33.8214 4.300
12 -34.0003 1.200 1.85026 32.35
13 -235.0206 Variable
14 69.3622 1.200 1.80100 34.92
15 29.8420 5.900 1.64000 60.19
16 -71.2277 1.500
17 34.4997 6.000 1.48749 70.32
18 -43.1246 1.300 1.80610 40.97
19 382.2412 2.700
20 ∞ Variable (Aperture S)
21 350.0000 1.200 1.83400 37.18
22 30.6178 4.800 1.51680 63.88
23 -88.2508 0.200
24 66.4312 2.800 1.80100 34.92
25 -142.7832 Variable
26 -93.6206 2.200 1.80518 25.45
27 -44.3477 6.500
28 -37.1859 1.000 1.77250 49.62
29 68.3000 Variable
30 -24.9508 1.400 1.62004 36.40
31 -42.7086 0.200
32 106.0000 3.800 1.67003 47.14
33 -106.0000 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 100.0 292.0
FNO 4.49 4.85 5.88
2ω 33.98 24.48 8.44
Ymax 21.60 21.60 21.60
TL 190.26 205.79 245.82
BF 39.12 46.10 67.12

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 5.981 21.510 61.535 5.981 21.510 61.535
d13 30.000 23.014 2.000 30.000 23.014 2.000
d20 14.365 14.107 14.196 14.365 14.107 14.196
d25 2.202 3.476 3.676 2.867 4.301 5.396
d29 21.004 19.988 19.700 20.339 19.163 17.979

[Lens group data]
Group start surface f
G1 1 145.335
G2 6 -29.607
G3 14 48.974
G4 21 62.364
G5 26 -48.296
G6 30 336.791

[Conditional expression correspondence value]
(1) (-fN) / fP = 1.253
(2) (-fTM1) / f1 = 0.204
(3) fTM2 / f1 = 0.264
(4) f1 / fw = 2.016
(5) f1 / (-fTM1) = 4.909
(6) f1 / fTM2 = 3.786
(7) nvrN / nvrP = 1.098
(8) νvrN / νvrP = 0.580

12 (a) and 12 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the vibration isolation function according to the third embodiment, and rotation of 0.30 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the blur. FIG. 13 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the third embodiment. 14 (a) and 14 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the third embodiment, and 0.20 ° rotation, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the blur. 15 (a), 15 (b), and 15 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of.

From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and even during short-distance focusing. It can be seen that it has excellent imaging performance.

(Fourth Example)
FIG. 16 is a diagram showing a lens configuration of a variable magnification optical system according to a fourth embodiment of the present application. In the variable magnification optical system according to the present embodiment, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a positive refractive power. It is composed of a fourth lens group G4 having a negative power and a fifth lens group G5 having a positive power.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 includes a regular convex flat lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side. Consists of a bonded positive lens.

The second lens group G2 has a negative meniscus lens L21 with a convex surface facing the object side, a biconvex positive lens L22, a biconcave negative lens L23, and a concave surface facing the object side in order from the object side. It is composed of a negative meniscus lens L24.

The third lens group G3 is a junction positive lens of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32, and a biconvex positive lens L33 and a biconcave shape in order from the object side. From the bonded positive lens with the negative lens L34, the aperture aperture S, the bonded negative lens between the negative meniscus lens L35 with the convex surface facing the object side and the biconvex positive lens L36, and the biconvex positive lens L37. It is composed.

The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a negative lens L42 having both concave shapes in order from the object side.

The fifth lens group G5 is composed of a negative meniscus lens L51 having a concave surface facing the object side, a biconvex positive lens L52, and a positive meniscus lens L53 having a convex surface facing the object side in order from the object side. ..

In the optical system according to the present embodiment, focusing of a long-distance object to a short-distance object is performed by moving the fourth lens group G4 in the image plane direction. Further, the junction positive lens of the negative meniscus lens L31 having the convex surface facing the object side constituting the third lens group G3 (M2 lens group GM2) and the biconvex positive lens L32 is moved in the direction orthogonal to the optical axis. This corrects the image formation position displacement due to camera shake or the like.

To correct rotational blur at an angle θ with a lens whose focal length of the entire system is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K. Is sufficient to move the moving lens group for image stabilization by (f · tan θ) / K in the direction orthogonal to the optical axis. At the wide-angle end of the fourth embodiment, the anti-vibration coefficient is 1.65 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is 0.23 mm. In the telephoto end state of the fourth embodiment, the anti-vibration coefficient is 2.10 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is 0.49 mm.

Table 4 below lists the values of the specifications of the optical system according to this embodiment.

(Table 4) Fourth Example
[Lens specifications]
Surface number R D nd νd
Physical surface ∞
1 109.5099 4.600 1.48749 70.32
2 ∞ 0.200
3 101.8486 1.800 1.62004 36.40
4 49.8873 7.200 1.49700 81.61
5 403.0130 Variable
6 166.1577 1.700 1.69680 55.52
7 31.1882 3.953
8 32.0256 5.500 1.78472 25.64
9 -139.5816 1.553
10 -767.2482 1.300 1.77250 49.62
11 33.9202 4.300
12 -32.8351 1.200 1.85026 32.35
13 -256.2484 Variable
14 69.5902 1.200 1.80100 34.92
15 29.9877 5.900 1.64000 60.19
16 -70.0411 1.500
17 36.2271 6.000 1.48749 70.32
18 -39.9358 1.300 1.80610 40.97
19 820.8027 2.700
20 ∞ 14.092 (Aperture S)
21 427.1813 1.200 1.83400 37.18
22 31.7606 4.800 1.51680 63.88
23 -89.4727 0.200
24 73.5865 2.800 1.80100 34.92
25 -110.0493 Variable
26 -83.7398 2.200 1.80518 25.45
27 -42.9999 6.500
28 -36.8594 1.000 1.77250 49.62
29 73.0622 Variable
30 -26.0662 1.400 1.62004 36.4
31 -40.4068 0.200
32 143.0444 3.035 1.67003 47.14
33 -220.8402 0.200
34 100.4330 2.145 1.79002 47.32
35 170.3325 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 100.0 292.0
FNO 4.48 4.85 5.87
2ω 33.94 24.44 8.42
Ymax 21.60 21.60 21.60
TL 190.21 205.27 245.82
BF 39.12 46.37 67.13

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 5.892 20.953 61.502 5.892 20.953 61.502
d13 30.000 22.752 2.000 30.000 22.752 2.000
d25 2.212 3.707 3.900 2.864 4.521 5.606
d29 21.306 19.811 19.618 20.654 18.997 17.912

[Lens group data]
Group start surface f
G1 1 145.022
G2 6 -29.562
G3 14 38.233
G4 26 -48.257
G5 30 318.066

[Conditional expression correspondence value]
(1) (-fN) / fP = 0.947
(2) (-fTM1) / f1 = 0.204
(3) fTM2 / f1 = 0.264
(4) f1 / fw = 2.011
(5) f1 / (-fTM1) = 4.906
(6) f1 / fTM2 = 3.793
(7) nvrN / nvrP = 1.098
(8) νvrN / νvrP = 0.580

17 (a) and 17 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the anti-vibration function according to the fourth embodiment, and rotation of 0.30 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the blur. FIG. 18 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the fourth embodiment. 19 (a) and 19 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the fourth embodiment, and 0.20 ° rotation, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the blur. 20 (a), 20 (b), and 20 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fourth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of.

From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and even during short-distance focusing. It can be seen that it has excellent imaging performance.

(Fifth Example)
The fifth embodiment will be described with reference to FIGS. 21 to 25 and Table 5. FIG. 21 is a diagram showing a lens configuration of a variable magnification optical system according to a fifth embodiment of the present embodiment. The variable magnification optical system ZL (5) according to the fifth embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative power, and a positive lens group G2 arranged in order from the object side. It is composed of a third lens group G3 having an optical power of the above, a fourth lens group G4 having a negative optical power, and a fifth lens group G5 having a positive optical power. When scaling from the wide-angle end state (W) to the telephoto end state (T), the first to fifth lens groups G1 to G5 move in the directions indicated by the arrows in FIG.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 is a joint positive lens L11 composed of a positive meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a biconvex positive lens L13 arranged in order from the object side. It consists of a lens.

The second lens group G2 includes a negative meniscus lens L21 having a convex surface facing the object side, a biconvex positive lens L22, a biconcave negative lens L23, and a biconcave negative lens L21 arranged in order from the object side. It is composed of a bonded negative lens composed of a lens L24 and a positive meniscus lens L25 having a convex surface facing the object side.

The third lens group G3 includes a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 arranged in order from the object side, a junction positive lens, and an aperture aperture S. It is composed of a junction positive lens consisting of a negative meniscus lens L34 having a convex surface facing the object side, a biconvex positive lens L35, and a biconvex positive lens L36.

The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a negative lens L42 having both concave shapes arranged in order from the object side.

The fifth lens group G5 is composed of a negative meniscus lens L51 having a concave surface facing the object side and a positive meniscus lens L52 having a convex surface facing the object side, which are arranged in order from the object side. The image plane I is arranged on the image side of the fifth lens group G5.

In the variable magnification optical system ZL (5) according to the fifth embodiment, the entire fourth lens group G4 constitutes the in-focus lens group, and the entire fourth lens group G4 is moved toward the image plane to be far away. Focusing is performed from a distance object to a short-range object. Further, in the variable magnification optical system ZL (5) according to the fifth embodiment, the junction negative lens composed of the negative lens L24 and the positive meniscus lens L25 constituting the second lens group G2 (M1 lens group GM1) is the optical axis. A group of anti-vibration lenses that can move in the vertical direction is configured to correct the displacement of the image formation position (image blur on the image plane I) due to camera shake or the like.

To correct rotational blurring at an angle θ with a lens whose focal length is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K. Is sufficient to move the moving lens group for image stabilization by (f · tan θ) / K in the direction orthogonal to the optical axis. In the wide-angle end state of the fifth embodiment, the anti-vibration coefficient is 0.97 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is It is 0.39 mm. In the telephoto end state of the fifth embodiment, the anti-vibration coefficient is 2.01 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is It is 0.51 mm.

Table 5 below lists the values of the specifications of the optical system according to the fifth embodiment.

(Table 5) Fifth Example [Lens Specifications]
Surface number R D nd νd
Physical surface ∞
1 121.1094 4.980 1.48749 70.31
2 474.6427 0.200
3 104.9110 1.700 1.83400 37.18
4 63.9583 9.069 1.49700 81.73
5 -1816.1542 Variable
6 153.9285 1.000 1.83400 37.18
7 37.0130 9.180
8 41.8122 5.321 1.80518 25.45
9 -148.0087 1.552
10 -153.0936 1.000 1.90366 31.27
11 74.4958 4.888
12 -65.0702 1.000 1.69680 55.52
13 35.9839 3.310 1.83400 37.18
14 121.5659 Variable
15 85.1793 3.534 1.80400 46.60
16 -101.3301 0.200
17 38.9890 5.033 1.49700 81.73
18 -62.2191 1.200 1.95000 29.37
19 378.6744 1.198
20 ∞ 19.885 (Aperture S)
21 44.8832 1.200 1.85026 32.35
22 20.5002 4.485 1.51680 63.88
23 -586.4581 0.200
24 64.4878 2.563 1.62004 36.40
25 -357.2881 Variable
26 -801.6030 2.383 1.80518 25.45
27 -50.3151 1.298
28 -57.1873 1.000 1.77250 49.62
29 26.1668 Variable
30 -21.0000 1.300 1.77250 49.62
31 -28.8136 0.200
32 58.9647 3.137 1.62004 36.40
33 524.5289 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 99.9 292.0
FNO 4.57 4.79 5.88
2ω 33.24 23.82 8.24
Ymax 21.60 21.60 21.60
TL 191.32 204.14 241.16
BF 38.52 42.04 60.52

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 2.000 22.163 69.630 2.000 22.163 69.630
d14 41.783 30.929 2.000 41.783 30.929 2.000
d25 2.000 3.259 2.000 2.462 3.867 3.166
d29 14.999 13.740 14.999 14.538 13.133 13.833

[Lens group data]
Group start surface f
G1 1 167.635
G2 6 -39.933
G3 15 37.727
G4 26 -36.765
G5 30 2825.740

[Conditional expression correspondence value]
(1) (-fN) / fP = 1.011
(2) (-fTM1) / f1 = 0.238
(3) fTM2 / f1 = 0.225
(4) f1 / fw = 2.325
(5) f1 / (-fTM1) = 4.198
(6) f1 / fTM2 = 4.443
(9) nvrN / nvrP = 0.925
(10) νvrN / νvrP = 1.493

22 (a) and 22 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the anti-vibration function according to the fifth embodiment, and 0.30 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. FIG. 23 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the fifth embodiment. 24 (a) and 24 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the fifth embodiment, and 0.20 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. 25 (a), 25 (b), and 25 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of.

From each aberration diagram, the variable magnification optical system according to the fifth embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, at the time of short-distance focusing. It can be seen that also has excellent imaging performance.

(6th Example)
The sixth embodiment will be described with reference to FIGS. 26 to 30 and Table 6. FIG. 26 is a diagram showing a lens configuration of a variable magnification optical system according to a sixth embodiment of the present embodiment. The variable magnification optical system ZL (6) according to the sixth embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative power, and a positive lens group G2 arranged in order from the object side. It is composed of a third lens group G3 having an optical power of the above, a fourth lens group G4 having a negative optical power, and a fifth lens group G5 having a negative optical power. When scaling from the wide-angle end state (W) to the telephoto end state (T), the first to fifth lens groups G1 to G5 move in the directions indicated by the arrows in FIG. 26, respectively.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 is a joint positive lens L11 composed of a positive meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a biconvex positive lens L13 arranged in order from the object side. It consists of a lens.

The second lens group G2 includes a negative meniscus lens L21 arranged in order from the object side and having a convex surface facing the object side, and a bonded positive lens composed of a biconvex positive lens L22 and a biconcave negative lens L23. It is composed of a concave negative lens L24 and a junction negative lens composed of a positive meniscus lens L25 with a convex surface facing the object side.

The third lens group G3 includes a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 arranged in order from the object side, a junction positive lens, and an aperture aperture S. It is composed of a junction negative lens consisting of a negative meniscus lens L34 having a convex surface facing the object side and a positive meniscus lens L35 having a convex surface facing the object side, and a biconvex positive lens L36.

The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a negative lens L42 having both concave shapes arranged in order from the object side.

The fifth lens group G5 is composed of a negative meniscus lens L51 having a concave surface facing the object side and a positive meniscus lens L52 having a convex surface facing the object side, which are arranged in order from the object side. The image plane I is arranged on the image side of the fifth lens group G5.

In the variable magnification optical system ZL (6) according to the sixth embodiment, the entire fourth lens group G4 constitutes the in-focus lens group, and the entire fourth lens group G4 is moved toward the image plane to be far away. Focusing is performed from a distance object to a short-range object. Further, in the variable magnification optical system ZL (6) according to the sixth embodiment, the junction negative lens composed of the negative lens L24 and the positive meniscus lens L25 constituting the second lens group G2 (M1 lens group GM1) is the optical axis. A group of anti-vibration lenses that can move in the vertical direction is configured to correct the displacement of the image formation position (image blur on the image plane I) due to camera shake or the like.

To correct rotational blurring at an angle θ with a lens whose focal length is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K. Is sufficient to move the moving lens group for image stabilization by (f · tan θ) / K in the direction orthogonal to the optical axis. In the wide-angle end state of the sixth embodiment, the anti-vibration coefficient is 0.93 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is It is 0.41 mm. In the telephoto end state of the sixth embodiment, the anti-vibration coefficient is 1.90 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is It is 0.54 mm.

Table 6 below lists the values of the specifications of the optical system according to the sixth embodiment.

(Table 6) 6th Example [Lens Specifications]
Surface number R D nd νd
Physical surface ∞
1 114.5391 5.639 1.48749 70.31
2 663.8041 0.200
3 103.9783 1.700 1.83400 37.18
4 62.4686 8.805 1.49700 81.73
5 -43979.1830 Variable
6 146.6152 1.000 1.77250 49.62
7 35.8241 11.693
8 37.5245 4.696 1.68893 31.16
9 -254.6834 1.000 1.83400 37.18
10 64.6045 5.066
11 -60.5874 1.000 1.56883 56.00
12 39.1203 2.952 1.75520 27.57
13 93.1442 Variable
14 92.3597 3.688 1.80400 46.60
15 -87.7395 0.200
16 36.8528 5.291 1.49700 81.73
17 -63.3187 1.200 1.95000 29.37
18 264.8384 1.289
19 ∞ 19.911 (Aperture S)
20 52.0583 1.200 1.85026 32.35
21 20.7485 3.983 1.51680 63.88
22 439.3463 0.200
23 64.0215 2.788 1.62004 36.40
24 -130.2911 Variable
25 -343.5287 2.371 1.80518 25.45
26 -47.6881 1.474
27 -51.9782 1.000 1.77250 49.62
28 29.6298 Variable
29 -21.0360 1.300 1.60300 65.44
30 -30.1613 0.200
31 64.8879 2.981 1.57501 41.51
32 614.9077 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 99.9 292.0
FNO 4.59 4.76 5.87
2ω 33.22 23.72 8.22
Ymax 21.60 21.60 21.60
TL 191.32 205.16 240.15
BF 38.52 41.03 60.02

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 2.000 23.304 67.717 2.000 23.304 67.717
d13 40.383 30.413 2.000 40.383 30.413 2.000
d24 2.000 3.305 2.001 2.487 3.962 3.248
d28 15.588 14.284 15.587 15.101 13.626 14.340

[Lens group data]
Group start surface f
G1 1 161.728
G2 6 -38.469
G3 14 38.469
G4 25 -39.083
G5 29 -12107.081

[Conditional expression correspondence value]
(1) (-fN) / fP = 0.968
(2) (-fTM1) / f1 = 0.238
(3) fTM2 / f1 = 0.238
(4) f1 / fw = 2.243
(5) f1 / (-fTM1) = 4.204
(6) f1 / fTM2 = 4.204
(9) nvrN / nvrP = 0.894
(10) νvrN / νvrP = 2.031

27 (a) and 27 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the anti-vibration function according to the sixth embodiment, and 0.30 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. FIG. 28 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the sixth embodiment. 29 (a) and 29 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the sixth embodiment, and 0.20 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. 30 (a), 30 (b), and 30 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of.

From each aberration diagram, the variable magnification optical system according to the sixth embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, at the time of short-distance focusing. It can be seen that also has excellent imaging performance.

(7th Example)
The seventh embodiment will be described with reference to FIGS. 31 to 35 and Table 7. FIG. 31 is a diagram showing a lens configuration of a variable magnification optical system according to a seventh embodiment of the present embodiment. The variable magnification optical system ZL (7) according to the seventh embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative power, and a positive lens group G2 arranged in order from the object side. It is composed of a third lens group G3 having an optical power of the above, a fourth lens group G4 having a negative optical power, and a fifth lens group G5 having a positive optical power. When scaling from the wide-angle end state (W) to the telephoto end state (T), the first to fifth lens groups G1 to G5 move in the directions indicated by the arrows in FIG. 31, respectively.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 is composed of a biconvex positive lens L11 arranged in order from the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a bonded positive lens L13 composed of a biconvex positive lens L13. It is composed.

The second lens group G2 includes a negative meniscus lens L21 arranged in order from the object side and having a convex surface facing the object side, and a bonded positive lens composed of a biconvex positive lens L22 and a biconcave negative lens L23. It is composed of a concave negative lens L24 and a junction negative lens composed of a positive meniscus lens L25 with a convex surface facing the object side.

The third lens group G3 includes a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 arranged in order from the object side, a junction positive lens, and an aperture aperture S. It is composed of a bonded positive lens composed of a negative meniscus lens L34 having a convex surface facing the object side and a biconvex positive lens L35.

The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a negative lens L42 having both concave shapes arranged in order from the object side.

The fifth lens group G5 is composed of a negative meniscus lens L51 having a concave surface facing the object side and a biconvex positive lens L52 arranged in order from the object side. The image plane I is arranged on the image side of the fifth lens group G5.

In the variable magnification optical system ZL (7) according to the seventh embodiment, the entire fourth lens group G4 constitutes the in-focus lens group, and the entire fourth lens group G4 is moved toward the image plane to be far away. Focusing is performed from a distance object to a short-range object. Further, in the variable magnification optical system ZL (7) according to the seventh embodiment, the junction negative lens composed of the negative lens L24 and the positive meniscus lens L25 constituting the second lens group G2 (M1 lens group GM1) is the optical axis. A group of anti-vibration lenses that can move in the vertical direction is configured to correct the displacement of the image formation position (image blur on the image plane I) due to camera shake or the like.

To correct rotational blurring at an angle θ with a lens whose focal length is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K. Is sufficient to move the moving lens group for image stabilization by (f · tan θ) / K in the direction orthogonal to the optical axis. In the wide-angle end state of the seventh embodiment, the anti-vibration coefficient is 0.96 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is It is 0.39 mm. In the telephoto end state of the seventh embodiment, the anti-vibration coefficient is 2.00 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is It is 0.51 mm.

Table 7 below lists the values of the specifications of the optical system according to the seventh embodiment.

(Table 7) The 7th Example [Lens Specifications]
Surface number R D nd νd
Physical surface ∞
1 268.8673 3.827 1.48749 70.31
2 -1922.6559 0.200
3 111.5860 1.700 1.62004 36.40
4 61.6123 8.761 1.49700 81.73
5 -1745.4439 Variable
6 124.2629 1.000 1.77250 49.62
7 34.3759 7.147
8 35.3149 5.189 1.60342 38.03
9 -190.5775 1.000 1.77250 49.62
10 75.4448 4.904
11 -65.2960 1.000 1.67003 47.14
12 37.2634 3.301 1.80518 25.45
13 119.9726 Variable
14 80.9765 3.968 1.77250 49.62
15 -78.4621 0.200
16 33.2120 5.701 1.49700 81.73
17 -56.7466 1.200 1.85026 32.35
18 108.8392 1.685
19 ∞ 18.569 (Aperture S)
20 40.1917 1.200 1.85026 32.35
21 18.3878 4.752 1.54814 45.79
22 -98.0255 Variable
23 -121.4042 2.367 1.75520 27.57
24 -36.6433 2.111
25 -37.5895 1.000 1.77250 49.62
26 35.8631 Variable
27 -21.0000 1.300 1.60311 60.69
28 -30.2149 0.200
29 95.7916 3.938 1.67003 47.14
30 -115.9256 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 99.9 292.0
FNO 4.61 4.79 5.87
2ω 33.52 23.90 8.28
Ymax 21.60 21.60 21.60
TL 191.32 207.98 243.25
BF 38.52 41.37 61.52

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 2.000 25.429 72.273 2.000 25.429 72.273
d13 43.342 33.718 2.000 43.342 33.718 2.000
d22 2.000 3.210 3.710 2.512 3.900 5.147
d26 19.235 18.025 17.525 18.723 17.335 16.088

[Lens group data]
Group start surface f
G1 1 169.647
G2 6 -39.988
G3 14 38.817
G4 23 -37.515
G5 27 207.702

[Conditional expression correspondence value]
(1) (-fN) / fP = 1.529
(2) (-fTM1) / f1 = 0.236
(3) fTM2 / f1 = 0.229
(4) f1 / fw = 2.353
(5) f1 / (-fTM1) = 4.242
(6) f1 / fTM2 = 4.370
(9) nvrN / nvrP = 0.925
(10) νvrN / νvrP = 1.852

32 (a) and 32 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the anti-vibration function according to the seventh embodiment, and 0.30 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. FIG. 33 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the seventh embodiment. 34 (a) and 34 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the seventh embodiment, and 0.20 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. 35 (a), 35 (b), and 35 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of.

From each aberration diagram, the variable magnification optical system according to the seventh embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, at the time of short-distance focusing. It can be seen that also has excellent imaging performance.

(8th Example)
The eighth embodiment will be described with reference to FIGS. 36 to 40 and Table 8. FIG. 36 is a diagram showing a lens configuration of a variable magnification optical system according to an eighth embodiment of the present embodiment. The variable magnification optical system ZL (8) according to the eighth embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative power, and a positive lens group G2 arranged in order from the object side. It is composed of a third lens group G3 having an optical power of the above, a fourth lens group G4 having a negative optical power, and a fifth lens group G5 having a positive optical power. When scaling from the wide-angle end state (W) to the telephoto end state (T), the first to fifth lens groups G1 to G5 move in the directions indicated by the arrows in FIG. 36, respectively.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 is composed of a biconvex positive lens L11 arranged in order from the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a bonded positive lens L13 composed of a biconvex positive lens L13. It is composed.

The second lens group G2 includes a negative meniscus lens L21 arranged in order from the object side and having a convex surface facing the object side, and a bonded positive lens composed of a biconvex positive lens L22 and a biconcave negative lens L23. It is composed of a concave negative lens L24 and a junction negative lens composed of a positive meniscus lens L25 with a convex surface facing the object side.

The third lens group G3 includes a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 arranged in order from the object side, a junction positive lens, and an aperture aperture S. It is composed of a bonded positive lens composed of a negative meniscus lens L34 having a convex surface facing the object side and a biconvex positive lens L35.

The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a negative lens L42 having both concave shapes arranged in order from the object side.

The fifth lens group G5 is composed of a negative meniscus lens L51 having a concave surface facing the object side and a biconvex positive lens L52. The image plane I is arranged on the image side of the fifth lens group G5.

In the variable magnification optical system ZL (8) according to the eighth embodiment, the positive meniscus lens L41 and the negative lens L42 of the fourth lens group G4 form a focusing lens group, and the positive meniscus lens L41 and the positive meniscus lens L41 of the fourth lens group G4. By moving the negative lens L42 toward the image plane, focusing from a long-distance object to a short-range object is performed. Further, in the variable magnification optical system ZL (8) according to the eighth embodiment, the junction negative lens composed of the negative lens L24 and the positive meniscus lens L25 constituting the second lens group G2 (M1 lens group GM1) is the optical axis. A group of anti-vibration lenses that can move in the vertical direction is configured to correct the displacement of the image formation position (image blur on the image plane I) due to camera shake or the like.

To correct rotational blurring at an angle θ with a lens whose focal length is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K. Is sufficient to move the moving lens group for image stabilization by (f · tan θ) / K in the direction orthogonal to the optical axis. In the wide-angle end state of the eighth embodiment, the anti-vibration coefficient is 1.05 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is It is 0.36 mm. In the telephoto end state of the eighth embodiment, the anti-vibration coefficient is 2.20 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is It is 0.46 mm.

Table 8 below lists the values of the specifications of the optical system according to the eighth embodiment.

(Table 8) Eighth Example [Lens Specifications]
Surface number R D nd νd
Physical surface ∞
1 384.8872 4.307 1.48749 70.31
2 -459.3665 0.200
3 108.5471 1.700 1.62004 36.40
4 59.1633 8.722 1.49700 81.73
5 -3828.8091 Variable
6 116.0785 1.000 1.77250 49.62
7 33.3782 6.789
8 34.8547 5.123 1.64769 33.73
9 -166.2311 1.000 1.80400 46.60
10 68.6485 5.021
11 -58.3172 1.000 1.66755 41.87
12 33.1524 3.543 1.80518 25.45
13 108.5224 Variable
14 80.6236 4.111 1.77250 49.62
15 -73.7947 0.200
16 32.8485 5.846 1.49700 81.73
17 -53.4390 1.200 1.85026 32.35
18 100.1735 1.748
19 ∞ 17.032 (Aperture S)
20 45.6071 1.200 1.80100 34.92
21 18.9488 5.048 1.54814 45.79
22 -90.5382 Variable
23 -106.0821 2.387 1.72825 28.38
24 -35.2284 2.066
25 -36.8890 1.000 1.77250 49.62
26 46.9619 Variable
27 -21.5153 1.300 1.60311 60.69
28 -31.7338 0.200
29 126.4587 3.612 1.77250 49.62
30 -132.9868 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 99.9 292.0
FNO 4.60 4.77 5.88
2ω 33.56 23.82 8.26
Ymax 21.60 21.60 21.60
TL 192.32 210.67 244.12
BF 38.52 40.08 57.94

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 2.000 25.713 69.580 2.000 25.713 69.580
d13 40.783 32.701 2.000 40.783 32.701 2.000
d22 2.000 3.163 5.584 2.559 3.917 7.234
d26 23.661 23.661 23.661 23.103 22.908 22.012

[Lens group data]
Group start surface f
G1 1 164.404
G2 6 -37.386
G3 14 38.634
G4 23 -43.744
G5 27 272.771

[Conditional expression correspondence value]
(1) (-fN) /fP=1.378
(2) (-fTM1) / f1 = 0.227
(3) fTM2 / f1 = 0.235
(4) f1 / fw = 2.280
(5) f1 / (-fTM1) = 4.397
(6) f1 / fTM2 = 4.255
(9) nvrN / nvrP = 0.924
(10) νvrN / νvrP = 1.645

37 (a) and 37 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the anti-vibration function according to the eighth embodiment, respectively, and 0.30 °. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. FIG. 38 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the eighth embodiment. 39 (a) and 39 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the eighth embodiment, respectively, and 0.20 °. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. 40 (a), 40 (b), and 40 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of.

From each aberration diagram, the variable magnification optical system according to the eighth embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, at the time of short-distance focusing. It can be seen that also has excellent imaging performance.

(9th Example)
A ninth embodiment will be described with reference to FIGS. 41 to 45 and Table 9. FIG. 41 is a diagram showing a lens configuration of a variable magnification optical system according to a ninth embodiment of the present embodiment. The variable magnification optical system ZL (9) according to the ninth embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative power, and a positive lens group G2 arranged in order from the object side. It is composed of a third lens group G3 having an optical power of the above, a fourth lens group G4 having a negative optical power, and a fifth lens group G5 having a positive optical power. When scaling from the wide-angle end state (W) to the telephoto end state (T), the first to fifth lens groups G1 to G5 move in the directions indicated by the arrows in FIG. 41, respectively.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 is composed of a biconvex positive lens L11 arranged in order from the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a bonded positive lens L13 composed of a biconvex positive lens L13. It is composed.

The second lens group G2 includes a negative meniscus lens L21 having a convex surface facing the object side, a positive meniscus lens L22 having a convex surface facing the object side, a biconcave negative lens L23, and the object side, which are arranged in order from the object side. It is composed of a junction negative lens made of a positive meniscus lens L24 having a convex surface facing the surface.

The third lens group G3 includes a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 arranged in order from the object side, a junction positive lens, and an aperture aperture S. It is composed of a bonded positive lens composed of a negative meniscus lens L34 having a convex surface facing the object side and a biconvex positive lens L35.

The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a negative lens L42 having both concave shapes arranged in order from the object side.

The fifth lens group G5 is composed of a negative meniscus lens L51 having a concave surface facing the object side and a biconvex positive lens L52 arranged in order from the object side. The image plane I is arranged on the image side of the fifth lens group G5.

In the variable magnification optical system ZL (9) according to the ninth embodiment, the entire fourth lens group G4 constitutes the in-focus lens group, and the entire fourth lens group G4 is moved in the image plane direction to be far away. Focusing is performed from a distance object to a short-range object. Further, in the variable magnification optical system ZL (9) according to the ninth embodiment, the junction negative lens composed of the negative lens L23 and the positive meniscus lens L24 constituting the second lens group G2 (M1 lens group GM1) is the optical axis. A group of anti-vibration lenses that can move in the vertical direction is configured to correct the displacement of the image formation position (image blur on the image plane I) due to camera shake or the like.

To correct rotational blurring at an angle θ with a lens whose focal length is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K. Is sufficient to move the moving lens group for image stabilization by (f · tan θ) / K in the direction orthogonal to the optical axis. In the wide-angle end state of the ninth embodiment, the anti-vibration coefficient is 1.02 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is It is 0.37 mm. In the telephoto end state of the ninth embodiment, the anti-vibration coefficient is 2.10 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is It is 0.49 mm.

Table 9 below lists the values of the specifications of the optical system according to the ninth embodiment.

(Table 9) 9th Example [Lens Specifications]
Surface number R D nd νd
Physical surface ∞
1 494.4763 3.486 1.48749 70.31
2 -654.7200 0.200
3 104.3848 1.700 1.62004 36.40
4 60.0944 8.673 1.49700 81.73
5 -2277.9468 Variable
6 131.3496 1.300 1.80400 46.60
7 35.6812 7.900
8 36.7192 2.871 1.68893 31.16
9 62.4101 4.726
10 -66.4912 1.000 1.70000 48.11
11 36.3174 3.414 1.80518 25.45
12 127.2974 Variable
13 90.0733 3.862 1.80400 46.60
14 -78.6804 0.200
15 33.8033 5.583 1.49700 81.73
16 -57.6791 1.200 1.85026 32.35
17 101.7237 1.726
18 ∞ 19.598 (Aperture S)
19 49.9975 1.200 1.85026 32.35
20 20.1023 4.713 1.54814 45.79
21 -72.4003 Variable
22 -158.4470 2.458 1.71736 29.57
23 -37.7406 1.732
24 -39.9149 1.000 1.77250 49.62
25 43.7406 Variable
26 -22.3495 1.300 1.69680 55.52
27 -32.8093 0.200
28 139.7659 3.301 1.80610 40.97
29 -141.5832 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 99.9 292.0
FNO 4.68 4.85 5.88
2ω 33.48 23.86 8.26
Ymax 21.60 21.60 21.60
TL 192.32 208.96 243.67
BF 38.32 41.06 60.32

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 2.000 26.074 74.834 2.000 26.074 77.834
d12 45.487 35.318 2.000 45.487 35.318 2.000
d21 2.000 3.315 2.845 2.597 4.123 4.511
d25 21.171 19.856 20.326 20.574 19.048 18.660

[Lens group data]
Group start surface f
G1 1 171.348
G2 6 -41.929
G3 13 40.969
G4 22 -45.959
G5 26 423.598

[Conditional expression correspondence value]
(1) (-fN) / fP = 1.209
(2) (-fTM1) / f1 = 0.245
(3) fTM2 / f1 = 0.239
(4) f1 / fw = 2.377
(5) f1 / (-fTM1) = 4.087
(6) f1 / fTM2 = 4.182
(9) nvrN / nvrP = 0.942
(10) νvrN / νvrP = 1.890

42 (a) and 42 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the anti-vibration function according to the ninth embodiment, and 0.30 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. FIG. 43 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the ninth embodiment. 44 (a) and 44 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the ninth embodiment, and 0.20 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. 45 (a), 45 (b), and 45 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the ninth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of.

From each aberration diagram, the variable magnification optical system according to the ninth embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, at the time of short-distance focusing. It can be seen that also has excellent imaging performance.

(10th Example)
The tenth embodiment will be described with reference to FIGS. 46 to 50 and Table 10. FIG. 46 is a diagram showing a lens configuration of a variable magnification optical system according to a tenth embodiment of the present embodiment. The variable magnification optical system ZL (10) according to the tenth embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative power, and a positive lens group G2 arranged in order from the object side. It is composed of a third lens group G3 having an optical power of the above, a fourth lens group G4 having a negative optical power, and a fifth lens group G5 having a positive optical power. When scaling from the wide-angle end state (W) to the telephoto end state (T), the first to fifth lens groups G1 to G5 move in the directions indicated by the arrows in FIG. 46, respectively.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, and the third lens group G3 is in the M2 lens group GM2.
The fourth lens group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the subsequent lens group GRS.

The first lens group G1 is a bonded positive lens composed of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12 arranged in order from the object side, and a positive meniscus lens having a convex surface facing the object side. It is composed of L13 and.

The second lens group G2 includes a biconvex positive lens L21, a biconcave negative lens L22, a positive meniscus lens L23 with a convex surface facing the object side, and a biconcave negative lens L21 arranged in order from the object side. It is composed of a bonded negative lens composed of a lens L24 and a positive meniscus lens L25 having a convex surface facing the object side.

The third lens group G3 includes a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 arranged in order from the object side, a junction positive lens, and an aperture aperture S. It is composed of a bonded positive lens composed of a negative meniscus lens L34 having a convex surface facing the object side and a biconvex positive lens L35.

The fourth lens group G4 is composed of a biconvex positive lens L41 and a biconcave negative lens L42 arranged in order from the object side.

The fifth lens group G5 is composed of a negative meniscus lens L51 having a concave surface facing the object side and a positive meniscus lens L52 having a convex surface facing the object side, which are arranged in order from the object side. The image plane I is arranged on the image side of the fifth lens group G5.

In the variable magnification optical system ZL (10) according to the tenth embodiment, the entire fourth lens group G4 constitutes the in-focus lens group, and the entire fourth lens group G4 is moved in the image plane direction to be far away. Focusing is performed from a distance object to a short-range object. Further, in the variable magnification optical system ZL (10) according to the tenth embodiment, the junction negative lens composed of the negative lens L24 and the positive meniscus lens L25 constituting the second lens group G2 (M1 lens group GM1) is the optical axis. A group of anti-vibration lenses that can move in the vertical direction is configured to correct the displacement of the image formation position (image blur on the image plane I) due to camera shake or the like.

To correct rotational blurring at an angle θ with a lens whose focal length is f and whose anti-vibration coefficient (ratio of image movement amount on the image plane to the movement amount of the moving lens group in image stabilization) is K. Is sufficient to move the moving lens group for image stabilization by (f · tan θ) / K in the direction orthogonal to the optical axis. In the wide-angle end state of the tenth embodiment, the anti-vibration coefficient is 1.01 and the focal length is 72.1 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.30 ° is It is 0.37 mm. In the telephoto end state of the tenth embodiment, the anti-vibration coefficient is 2.10 and the focal length is 292.0 mm, so that the amount of movement of the anti-vibration lens group for correcting the rotational blur of 0.20 ° is It is 0.49 mm.

Table 10 below lists the values of the specifications of the optical system according to the tenth embodiment.

(Table 10) The tenth embodiment [lens specifications]
Surface number R D nd νd
Physical surface ∞
1 139.3408 1.700 1.64769 33.73
2 77.5654 9.455 1.49700 81.73
3 -496.0322 0.200
4 144.5249 3.734 1.48749 70.31
5 357.2933 Variable
6 142.3498 3.303 1.84666 23.80
7 -361.0297 1.824
8-451.3220 1.300 1.83400 37.18
9 33.3045 7.193
10 35.8308 3.147 1.71736 29.57
11 69.2532 4.718
12 -63.1663 1.000 1.66755 41.87
13 34.7105 3.239 1.80518 25.45
14 102.2323 Variable
15 73.7312 3.697 1.77250 49.62
16 -95.2978 0.200
17 33.5557 5.512 1.49700 81.73
18 -68.5312 1.200 1.90366 31.27
19 129.3820 1.534
20 ∞ 17.193 (Aperture S)
21 40.0826 1.200 1.85026 32.35
22 17.3868 5.268 1.56732 42.58
23 -141.3282 Variable
24 297.2824 2.624 1.64769 33.73
25 -42.2438 0.835
26 -48.9103 1.000 1.77250 49.62
27 31.0082 Variable
28 -22.3095 1.300 1.69680 55.52
29 -31.0148 0.200
30 73.8865 3.135 1.80100 34.92
31 3043.5154 BF
Image plane ∞

[Various data]
Variable ratio 4.05
WMT
f 72.1 100.0 292.0
FNO 4.65 4.93 5.88
2ω 33.24 23.86 8.28
Ymax 21.60 21.60 21.60
TL 192.32 206.35 244.34
BF 38.32 42.77 60.32

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 2.000 22.642 74.835 2.000 22.642 74.835
d14 44.818 33.757 2.000 44.818 33.757 2.000
d23 2.000 3.329 2.024 2.604 4.116 3.661
d27 19.472 18.143 19.448 18.869 17.356 17.812

[Lens group data]
Group start surface f
G1 1 176.000
G2 6 -42.283
G3 15 38.971
G4 24 -44.470
G5 28 381.600

[Conditional expression correspondence value]
(1) (-fN) /fP=1.286
(2) (-fTM1) / f1 = 0.240
(3) fTM2 / f1 = 0.221
(4) f1 / fw = 2.441
(5) f1 / (-fTM1) = 4.162
(6) f1 / fTM2 = 4.516
(9) nvrN / nvrP = 0.924
(10) νvrN / νvrP = 1.645

47 (a) and 47 (b) are aberration diagrams at infinity focusing in the wide-angle end state of the variable magnification optical system having the anti-vibration function according to the tenth embodiment, and 0.30 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. FIG. 48 is a diagram of various aberrations at infinity focusing in the intermediate focal length state of the variable magnification optical system having the vibration isolating function according to the tenth embodiment. 49 (a) and 49 (b) are aberration diagrams at infinity focusing in the telephoto end state of the variable magnification optical system having the anti-vibration function according to the tenth embodiment, and 0.20 °, respectively. It is a meridional lateral aberration diagram when the blur correction is performed for the rotation blur. 50 (a), 50 (b), and 50 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the tenth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations of.

From each aberration diagram, the variable magnification optical system according to the tenth embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and further, at the time of short-distance focusing. It can be seen that also has excellent imaging performance.

(11th Example)
The eleventh embodiment will be described with reference to FIGS. 51, 52 and 53, and Table 11. FIG. 51 is a diagram showing a lens configuration of a variable magnification optical system according to the eleventh embodiment of the present embodiment. The variable magnification optical system ZL (11) according to the eleventh embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative power, and a positive lens group G2 arranged in order from the object side. It is composed of a third lens group G3 having an optical power of the above, a fourth lens group G4 having a negative optical power, and a fifth lens group G5 having a positive optical power. An aperture diaphragm S is provided in the third lens group G3, and an image plane I is provided facing the image plane side of the fifth lens group G5.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 consists of a biconvex positive lens L11 arranged in order from the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. It consists of a lens.

The second lens group G2 is composed of a junction negative lens consisting of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side arranged in order from the object side, and a biconcave negative lens L23. It is composed.

The third lens group G3 includes a biconvex positive lens L31, an aperture aperture S, a biconvex positive lens L32, and a biconcave negative lens L33 arranged in order from the object side. It is composed of a bonded positive lens composed of a negative meniscus lens L34 having a convex surface facing the object side and a biconvex positive lens L35, and a positive meniscus lens L36 having a convex surface facing the object side.

The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a junction negative lens composed of a biconcave negative lens L42.

The fifth lens group G5 is composed of a biconvex positive lens L51.

In the optical system according to the eleventh embodiment, focusing from a long-distance object to a short-distance object is performed by moving the fourth lens group G4 (RN lens group GRN) in the image plane direction. Further, the second lens group G2 (M1 lens group GM1) constitutes an anti-vibration lens group having a displacement component in the direction perpendicular to the optical axis and the optical axis, and image blur correction (vibration-proof, camera shake) on the image plane I. It is preferable to perform correction).

Table 11 below lists the values of the specifications of the optical system according to the eleventh embodiment.

(Table 11) 11th Example
[Lens specifications]
Surface number R D nd νd
Physical surface ∞
1 91.1552 6.167 1.51680 63.88
2 -844.6033 0.204
3 92.5357 1.500 1.64769 33.73
4 45.6802 6.598 1.48749 70.31
5 154.0927 Variable
6 -211.4795 1.000 1.69680 55.52
7 22.5821 3.677 1.80518 25.45
8 60.3602 2.652
9 -46.9021 1.000 1.77250 49.62
10 299.7358 Variable
11 48.8916 3.796 1.69680 55.52
12 -131.4333 1.000
13 ∞ 1.000 (Aperture S)
14 39.8799 4.932 1.69680 55.52
15 -49.6069 1.000 1.85026 32.35
16 72.3703 8.805
17 57.3477 1.000 1.80100 34.92
18 18.1075 6.038 1.48749 70.31
19 -116.1586 0.200
20 26.5494 3.513 1.62004 36.40
21 96.5593 Variable
22 -119.7021 3.510 1.74950 35.25
23 -16.6839 1.000 1.69680 55.52
24 25.6230 Variable
25 124.9308 2.143 1.48749 70.31
26 -480.8453 BF
Image plane ∞

[Various data]
Magnification ratio 4.12
WMT
f 71.4 100.0 294.0
FNO 4.56 4.26 5.89
2ω 22.82 16.04 5.46
Ymax 14.25 14.25 14.25
TL 159.32 185.24 219.32
BF 45.32 39.43 70.09

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 2.881 37.560 65.654 2.881 37.560 65.654
d10 29.543 26.683 2.000 29.543 26.683 2.000
d21 5.002 5.002 5.002 5.295 5.470 5.772
d24 15.836 15.836 15.836 15.543 15.368 15.066

[Lens group data]
Group start surface f
G1 1 146.976
G2 6 -31.771
G3 11 30.544
G4 22 -32.594
G5 25 203.039

[Conditional expression correspondence value]
(2) (-fTM1) / f1 = 0.216
(3) fTM2 / f1 = 0.208
(4) f1 / fw = 2.058
(5) f1 / (-fTM1) = 4.626
(6) f1 / fTM2 = 4.809

52 (a), 52 (b), and 52 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eleventh embodiment, respectively, at the time of infinity focusing. It is a diagram of various aberrations.

53 (a), 53 (b), and 53 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eleventh embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations.

From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and even during short-distance focusing. It can be seen that it has excellent imaging performance.

(12th Example)
A twelfth embodiment will be described with reference to FIGS. 54, 55 and 56, and Table 12. FIG. 54 is a diagram showing a lens configuration of a variable magnification optical system according to a twelfth embodiment of the present embodiment. The variable magnification optical system ZL (12) according to the twelfth embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative power, and a positive lens group G2 arranged in order from the object side. It is composed of a third lens group G3 having an optical power of the above, a fourth lens group G4 having a negative optical power, and a fifth lens group G5 having a positive optical power.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 consists of a biconvex positive lens L11 arranged in order from the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. It consists of a lens.

The second lens group G2 is composed of a junction negative lens L21 composed of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side arranged in order from the object side, and a biconcave negative lens L23. Will be done.

The third lens group G3 includes a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 arranged in order from the object side, a junction positive lens, and an aperture aperture S. It is composed of a bonded positive lens composed of a negative meniscus lens L34 having a convex surface facing the object side and a biconvex positive lens L35, and a positive meniscus lens L36 having a convex surface facing the object side.

The fourth lens group G4 is composed of a positive meniscus lens L41 having a concave surface facing the object side and a junction negative lens of a biconcave negative lens L42.

The fifth lens group G5 is composed of a positive meniscus lens L51 with a convex surface facing the object side.

In the optical system according to the twelfth embodiment, focusing from a long-distance object to a short-distance object is performed by moving the fourth lens group G4 in the image plane direction. In this embodiment, the second lens group G2 (M1 lens group GM1) constitutes an anti-vibration lens group having a displacement component in the direction perpendicular to the optical axis and the optical axis, and image stabilization (anti-vibration) on the image plane I. , It is preferable to perform camera shake correction).

Table 12 below lists the values of the specifications of the optical system according to the twelfth embodiment.

(Table 12) 12th Example
[Lens specifications]
Surface number R D nd νd
Physical surface ∞
1 100.0120 5.590 1.51680 63.88
2-356.7115 0.200
3 87.0822 1.500 1.62004 36.40
4 36.8924 7.184 1.51680 63.88
5 131.1594 Variable
6 -122.1413 1.000 1.69680 55.52
7 20.4910 3.496 1.80518 25.45
8 49.8357 2.470
9 -48.8699 1.000 1.77250 49.62
10 8360.2394 Variable
11 56.6713 3.785 1.58913 61.22
12 -64.2309 0.200
13 35.4309 4.669 1.48749 70.31
14 -48.4394 1.000 1.80100 34.92
15 159.7328 1.860
16 ∞ 16.684 (Aperture S)
17 57.8297 1.000 1.80100 34.92
18 19.6163 4.946 1.48749 70.31
19 -96.4204 0.200
20 27.1066 2.717 1.62004 36.40
21 65.2029 Variable
22 -157.1131 3.395 1.64769 33.73
23 -22.3553 1.000 1.56883 56.00
24 25.0407 Variable
25 46.5745 2.500 1.62004 36.40
26 60.0000
Image plane ∞

[Various data]
Magnification ratio 4.29
WMT
f 68.6 100.0 294.0
FNO 4.69 4.72 6.10
2ω 23.74 16.04 5.46
Ymax 14.25 14.25 14.25
TL 164.32 184.76 221.32
BF 38.52 38.73 64.73

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 4.964 31.058 63.669 4.964 31.058 63.669
d10 29.909 24.050 2.000 29.909 24.050 2.000
d21 3.666 4.368 2.697 4.068 4.962 3.755
d24 20.866 20.163 21.834 20.464 19.569 20.776

[Lens group data]
Group start surface f
G1 1 137.939
G2 6 -30.083
G3 11 34.644
G4 22 -42.585
G5 25 313.363

[Conditional expression correspondence value]
(2) (-fTM1) / f1 = 0.218
(3) fTM2 / f1 = 0.251
(4) f1 / fw = 2.011
(5) f1 / (-fTM1) = 4.585
(6) f1 / fTM2 = 3.982

55 (a), 55 (b), and 55 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the twelfth embodiment, respectively, at the time of infinity focusing. It is a diagram of various aberrations. 56 (a), 56 (b), and 56 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the twelfth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations. From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and even during short-distance focusing. It can be seen that it has excellent imaging performance.

(13th Example)
The thirteenth embodiment will be described with reference to FIGS. 57, 58 and 59, and Table 13. FIG. 57 is a diagram showing a lens configuration of a variable magnification optical system according to a thirteenth embodiment of the present embodiment. The variable magnification optical system ZL (13) according to the thirteenth embodiment has a first lens group G1 having a positive refractive power, a second lens group G2 having a negative power, and a positive lens group G2 arranged in order from the object side. It is composed of a third lens group G3 having an optical power of the above, a fourth lens group G4 having a negative optical power, and a fifth lens group G5 having a positive optical power.

In relation to the above embodiment, the first lens group G1 is in the front lens group GFS, the second lens group G2 is in the M1 lens group GM1, the third lens group G3 is in the M2 lens group GM2, and the fourth lens. The group G4 corresponds to the RN lens group GRN, and the fifth lens group G5 corresponds to the succeeding lens group GRS.

The first lens group G1 is a junction composed of a biconvex positive lens L11 arranged in order from the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. It consists of a positive lens.

The second lens group G2 is composed of a junction negative lens L21 composed of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side arranged in order from the object side, and a biconcave negative lens L23. Will be done.

The third lens group G3 includes a biconvex positive lens L31, a biconvex positive lens L32, and a biconcave negative lens L33 arranged in order from the object side, a junction positive lens, and an aperture aperture S. It is composed of a bonded positive lens composed of a negative meniscus lens L34 having a convex surface facing the object side and a biconvex positive lens L35, and a positive meniscus lens L36 having a convex surface facing the object side.

The fourth lens group G4 is composed of a bonded negative lens composed of a positive meniscus lens L41 having a concave surface facing the object side and a negative lens L42 having a biconcave shape, and a negative meniscus lens L43 having a convex surface facing the object side.

The fifth lens group G5 is composed of a positive meniscus lens L51 with a convex surface facing the object side.

In the optical system according to the thirteenth embodiment, focusing from a long-distance object to a short-distance object is performed by moving the fourth lens group G4 in the image plane direction. In this embodiment, the second lens group G2 (M1 lens group GM1) constitutes an anti-vibration lens group having a displacement component in the direction perpendicular to the optical axis and the optical axis, and image stabilization (anti-vibration) on the image plane I. , It is preferable to perform camera shake correction).

Table 13 below lists the values of the specifications of the optical system according to the thirteenth embodiment.

(Table 13) 13th Example
[Lens specifications]
Surface number R D nd νd
Physical surface ∞
1 102.5193 5.542 1.51680 63.88
2-366.1796 0.200
3 90.4094 1.500 1.62004 36.40
4 37.8518 7.229 1.51680 63.88
5 144.7539 Variable
6 -163.5053 1.000 1.69680 55.52
7 20.5835 3.475 1.80518 25.45
8 48.1602 2.598
9 -47.4086 1.000 1.77250 49.62
10 4634.3570 Variable
11 57.6094 3.843 1.58913 61.22
12 -66.7307 0.200
13 36.4629 4.709 1.48749 70.31
14 -48.7603 1.000 1.80100 34.92
15 206.1449 1.786
16 ∞ 16.497 (Aperture S)
17 55.1101 1.000 1.80100 34.92
18 19.3181 4.785 1.48749 70.31
19 -100.3387 0.200
20 26.0254 2.707 1.62004 36.40
21 57.5286 Variable
22 -201.9970 3.376 1.64769 33.73
23 -22.7237 1.000 1.56883 56.00
24 29.2295 1.172
25 34.9681 1.000 1.79952 42.09
26 26.1166 Variable
27 39.9439 2.135 1.62004 36.40
28 60.0000 BF
Image plane ∞

[Various data]
Scale ratio 4.28
WMT
f 68.7 100.0 294.0
FNO 4.70 4.73 6.06
2ω 23.74 16.08 5.48
Ymax 14.25 14.25 14.25
TL 164.32 184.47 221.32
BF 38.52 38.72 64.52

[Variable interval data]
WMTWMT
Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity Point at infinity
d5 4.000 30.052 63.492 4.000 30.052 63.492
d10 30.492 24.393 2.000 30.492 24.393 2.000
d21 3.686 4.454 2.923 4.052 4.994 3.907
d26 19.668 18.899 20.430 19.301 18.359 19.446

[Lens group data]
Group start surface f
G1 1 138.289
G2 6 -30.436
G3 11 34.256
G4 22 -36.764
G5 27 185.180

[Conditional expression correspondence value]
(2) (-fTM1) / f1 = 0.220
(3) fTM2 / f1 = 0.248
(4) f1 / fw = 2.013
(5) f1 / (-fTM1) = 4.544
(6) f1 / fTM2 = 4.037

58 (a), 58 (b), and 58 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the thirteenth embodiment, respectively, at the time of infinity focusing. It is a diagram of various aberrations. 59 (a), 59 (b), and 59 (c) show the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the thirteenth embodiment, respectively, at the time of short-range focusing. It is a diagram of various aberrations. From each aberration diagram, the variable magnification optical system according to this embodiment satisfactorily corrects various aberrations from the wide-angle end state to the telephoto end state and has excellent imaging performance, and even during short-distance focusing. It can be seen that it has excellent imaging performance.

According to each of the above embodiments, by reducing the size and weight of the focusing lens group, high-speed AF and quietness during AF are realized without increasing the size of the lens barrel, and further, from the wide-angle end state to the telephoto end. It is possible to realize a variable magnification optical system that satisfactorily suppresses aberration fluctuations during scaling to a state and aberration fluctuations during focusing from an infinity object to a short-range object.

Here, each of the above examples shows a specific example of the present invention, and the present invention is not limited thereto.

The following contents can be appropriately adopted as long as the optical performance of the variable magnification optical system of the present application is not impaired.

As numerical examples of the variable magnification optical system of the present application, those having a 5-group configuration and those having a 6-group configuration are shown, but the present application is not limited to this, and the variable-magnification optical system having another group configuration (for example, 7 groups, etc.) is shown. Can also be configured. Specifically, a lens or a lens group may be added to the most object side or the most image plane side of the variable magnification optical system of the present application. The lens group refers to a portion having at least one lens separated by an air interval that changes at the time of scaling.

Further, the lens surface of the lens constituting the variable magnification optical system of the present application may be a spherical surface or a flat surface, or may be an aspherical surface. When the lens surface is spherical or flat, lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented, which is preferable. Further, even if the image plane is displaced, the deterioration of the depiction performance is small, which is preferable. When the lens surface is an aspherical surface, it can be either an aspherical surface obtained by grinding, a glass molded aspherical surface formed by molding glass into an aspherical surface shape, or a composite aspherical surface formed by forming a resin provided on the glass surface into an aspherical surface shape. good. Further, the lens surface may be a diffraction surface, and the lens may be a refractive index distribution type lens (GRIN lens) or a plastic lens.

Further, an antireflection film having a high transmittance in a wide wavelength range may be applied to the lens surface of the lens constituting the variable magnification optical system of the present application. As a result, flare and ghost can be reduced, and high-contrast and high optical performance can be achieved.

With the above configuration, the camera 1 equipped with the variable magnification optical system according to the first embodiment as the photographing lens 2 is capable of reducing the size and weight of the focusing lens group, thereby achieving high speed without increasing the size of the lens barrel. Achieves excellent AF and quietness during AF, and also satisfactorily suppresses aberration fluctuations during scaling from the wide-angle end state to the telephoto end state and aberration fluctuations during focusing from an infinity object to a short-range object. , Good optical performance can be achieved. Even if a camera equipped with the variable magnification optical system according to the second to seventh embodiments as the photographing lens 2, the same effect as that of the camera 1 can be obtained.

G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G5 5th lens group GFS front lens group GM1 M1 lens group GM2 M2 lens group GRN RN lens group GRS trailing lens group I image plane S aperture Aperture

Claims (11)

From the object side, from the front lens group which is composed of one lens group and has a positive refractive power, the M1 lens group which has a negative refractive power, the M2 lens group which has a positive refractive power, and one lens group. It consists of an RN lens group that is composed and has a negative refractive power, and a subsequent lens group that is composed of one lens group.
At the time of scaling, the distance between the front lens group and the M1 lens group changes, the distance between the M1 lens group and the M2 lens group changes, and the distance between the M2 lens group and the RN lens group changes. Then, the distance between the RN lens group and the subsequent lens group changes, and when the M1 lens group consists of a plurality of lens groups, the distance between adjacent lens groups in the M1 lens group changes, and the M2 When the lens group consists of a plurality of lens groups, the distance between adjacent lens groups in the M2 lens group changes.
When scaling from the wide-angle end state to the telephoto end state, the front lens group moves to the object side,
When focusing from an infinity object to a short-distance object, the RN lens group moves.
Adjacent to the image side of the RN lens group, it has a negative meniscus lens with a concave surface facing the object side.
The subsequent lens group includes a lens having a negative refractive power and a lens having a positive refractive power in order from the object side.
A variable magnification optical system that satisfies the following conditional expression.
0.90 <(-fN) /fP <2.00
3.20 <f1 / fTM2 <5.00
However, fN: the focal length of the lens having the strongest negative refractive force in the trailing lens group fP: the focal length of the lens having the strongest positive refractive force in the trailing lens group f1: the focal length of the front lens group fTM2 : Focal length of the M2 lens group in the telephoto end state The variable magnification optical system according to claim 1, wherein the M1 lens group has a vibration-proof lens group that can move in a direction orthogonal to the optical axis in order to correct the image formation position displacement due to camera shake or the like. The anti-vibration lens group is composed of a lens having a negative refractive power and a lens having a positive refractive power in order from the object side.
The variable magnification optical system according to claim 2 , which satisfies the following conditional expression.
0.80 <nvrN / nvrP <1.00
However, nvrN: the refractive index of the lens having a negative refractive index in the anti-vibration lens group nvrP: the refractive index of the lens having a positive refractive index in the anti-vibration lens group. The anti-vibration lens group is composed of a lens having a negative refractive power and a lens having a positive refractive power in order from the object side.
The variable magnification optical system according to claim 2 or 3 , which satisfies the following conditional expression.
1.20 <νvrN / νvrP <2.40
However, νvrN: Abbe number of lenses having a negative refractive power in the anti-vibration lens group νvrP: Abbe number of lenses having a positive refractive power in the anti-vibration lens group. The variable magnification optical system according to claim 1, wherein the M2 lens group has a vibration-proof lens group that can move in a direction orthogonal to the optical axis in order to correct the image formation position displacement due to camera shake or the like. The variable magnification optical system according to claim 5 , wherein the anti-vibration lens group includes a lens having a negative refractive power and a lens having a positive refractive power in order from the object side. The variable magnification optical system according to claim 6 , which satisfies the following conditional expression.
1.00 <nvrN / nvrP <1.25
However, nvrN: the refractive index of the lens having a negative refractive index in the anti-vibration lens group nvrP: the refractive index of the lens having a positive refractive index in the anti-vibration lens group. The variable magnification optical system according to claim 6 or 7 , which satisfies the following conditional expression.
0.30 <νvrN / νvrP <0.90
However, νvrN: Abbe number of lenses having a negative refractive power in the anti-vibration lens group νvrP: Abbe number of lenses having a positive refractive power in the anti-vibration lens group. The variable magnification optical system according to any one of claims 1 to 8 , which satisfies the following conditional expression.
0.15 <(-fTM1) /f1 <0.35
However, fTM1: the focal length of the M1 lens group in the telephoto end state. The variable magnification optical system according to any one of claims 1 to 9 , which satisfies the following conditional expression.
0.20 <fTM2 / f1 <0.40 An optical device having the variable magnification optical system according to any one of claims 1 to 10 .

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