WO2017094664A1 - 変倍光学系、光学機器および変倍光学系の製造方法 - Google Patents
変倍光学系、光学機器および変倍光学系の製造方法 Download PDFInfo
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- WO2017094664A1 WO2017094664A1 PCT/JP2016/085194 JP2016085194W WO2017094664A1 WO 2017094664 A1 WO2017094664 A1 WO 2017094664A1 JP 2016085194 W JP2016085194 W JP 2016085194W WO 2017094664 A1 WO2017094664 A1 WO 2017094664A1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-++-
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/146—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups
- G02B15/1461—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having more than five groups the first group being positive
Definitions
- the present invention relates to a variable magnification optical system, an optical apparatus using the same, and a method for manufacturing the variable magnification optical system.
- variable power optical system suitable for a photographic camera, an electronic still camera, a video camera, and the like has been proposed (see, for example, Patent Document 1).
- the conventional variable power optical system has insufficient optical performance.
- a variable magnification optical system includes a first lens group having positive refractive power, arranged in order from the object side, an intermediate group having at least one lens group and having negative refractive power as a whole, and a positive An intermediate lens group having a refractive power of: a subsequent lens group having a positive refractive power, and a subsequent group composed of at least one lens group, and at the time of zooming, the first lens group;
- the distance between the intermediate group changes, the distance between the intermediate group and the intermediate lens group changes, the distance between the intermediate lens group and the subsequent lens group changes, and the subsequent lens group
- the interval with the subsequent group changes, and the subsequent lens group moves during focusing, and the intermediate group has a subgroup that satisfies the following conditional expression.
- An optical apparatus is configured by mounting the above-described variable magnification optical system.
- a method of manufacturing a variable magnification optical system includes a first lens group having a positive refractive power arranged in order from the object side, and an intermediate group having at least one lens group and having a negative refractive power as a whole.
- an interval between the first lens group and the intermediate group changes, an interval between the intermediate group and the intermediate lens group changes, and the intermediate lens group and the intermediate group
- the distance between the subsequent lens group changes, the distance between the subsequent lens group and the subsequent group changes, and the subsequent lens group moves during focusing, and the intermediate group satisfies the following conditional expression:
- Each lens is arranged in the lens barrel so that it has a satisfactory subgroup To.
- FIG. 2A is a diagram showing various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the first example.
- FIG. 2B is a graph showing a rotational blur of 0.30 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 7 is a diagram illustrating various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the first example.
- FIG. 2A is a diagram showing various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the first example.
- FIG. 2B is a graph showing a rotational blur of 0.30 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 7 is a diagram illustrating various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to
- FIG. 4A is a diagram of various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to the first example.
- FIG. 4B is a graph showing a rotational blur of 0.20 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- 5 (a), 5 (b), and 5 (c), respectively, are in close focus at 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 example.
- FIG. 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 a diagram of various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the second example, and FIG. 7B is a graph showing a rotational blur of 0.30 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 12 is a diagram illustrating various aberrations at the time of focusing on infinity in the intermediate focal length state of the variable magnification optical system according to the second example.
- FIG. 9A is a diagram of various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to the second example, and FIG. 9B is a graph showing a rotational blur of 0.20 °.
- FIG. 9A is a diagram of various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the second example
- FIG. 9B is a graph showing a rotation
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- 10 (a), 10 (b), and 10 (c) respectively show the close-up focusing in 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 example.
- FIG. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 3rd Example of this embodiment.
- FIG. 12A is a diagram of various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the third example, and
- FIG. 12B is a graph showing a rotational blur of 0.30 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 14A is a diagram of various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to the third example
- FIG. 14B is a graph showing a rotational blur of 0.20 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- 15 (a), 15 (b), and 15 (c) respectively show the close-up focusing in 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 example.
- FIG. 14A is a diagram of various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to the third example
- FIG. 14B is a graph showing a rotational blur of 0.20 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- 15 (a), 15 (b), and 15 (c) respectively show the close-up
- FIG. 17A is a diagram of various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the fourth example
- FIG. 17B is a graph showing a rotational blur of 0.30 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 12 is a diagram illustrating various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the fourth example.
- FIG. 17A is a diagram of various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the fourth example
- FIG. 17B is a graph showing a rotational blur of 0.30 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 12 is a diagram illustrating various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the fourth
- FIG. 19A is a diagram of various aberrations at the time of focusing on infinity in the telephoto end state of the variable magnification optical system according to the fourth example
- FIG. 19B is a graph showing a rotational blur of 0.20 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed. 20 (a), 20 (b), and 20 (c), respectively, at the time of close focus in 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 example.
- FIG. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 5th Example of this embodiment.
- FIG. 22A is a diagram of various aberrations at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the fifth example, and FIG. 22B is a graph showing a rotational blur of 0.30 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 10 is a diagram illustrating various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the fifth example.
- FIG. 24A is a diagram of various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to the fifth example, and FIG. 24B is a graph showing a rotational blur of 0.20 °.
- FIG. 24A is a diagram of various aberrations at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the fifth example
- FIG. 24B is a graph showing a rotational blur of
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIGS. 25 (a), 25 (b), and 25 (c) are respectively close-focused in 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 example.
- FIG. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 6th Example of this embodiment.
- FIG. 27A is a diagram of various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the sixth example.
- FIG. 27B is a graph showing a rotational blur of 0.30 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 12 is a diagram illustrating various aberrations at the time of focusing on infinity in the intermediate focal length state of the variable magnification optical system according to the sixth example.
- FIG. 29A is a diagram of various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to the sixth example
- FIG. 29B is a graph showing a rotational blur of 0.20 °.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- 30 (a), 30 (b), and 30 (c), respectively, are in close focus at 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 example.
- FIG. 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.
- variable magnification optical system ZL (1) as an example of a variable magnification optical system (zoom lens) ZL according to the present embodiment has a first refractive power arranged in order from the object side, as shown in FIG.
- a subsequent lens group GRP2 fourth lens group G4 having a positive refractive power, and a subsequent group GR (fifth lens group G5) including at least one lens group. .
- the distance between the first lens group G1 and the intermediate group GM changes, the distance between the intermediate group GM and the intermediate lens group GRP1 changes, and the intermediate lens group GRP1 and the subsequent lens group GRP2 change.
- the interval changes, and the interval between the subsequent lens group GRP2 and the subsequent group GR changes.
- the subsequent lens group GRP2 moves as the focusing lens group.
- variable magnification optical system ZL may be the variable magnification optical system ZL (2) shown in FIG. 6 or the variable magnification optical system ZL (3) shown in FIG. 11, and the variable magnification optical system shown in FIG. ZL (4) may be used, the variable magnification optical system ZL (5) shown in FIG. 21 may be used, and the variable magnification optical system ZL (6) shown in FIG. 26 may be used.
- Each group of the variable magnification optical systems ZL (2), ZL (3), ZL (4) shown in FIGS. 6, 11, and 16 is the same as the variable magnification optical system ZL (1) shown in FIG. Configured.
- the intermediate group GM (second lens group G2), the intermediate side lens group GRP1 (third lens group G3), and the subsequent side lens group GRP2 (fourth lens group).
- G4) is configured in the same manner as the variable magnification optical system ZL (1) shown in FIG. 1, and the subsequent group GR includes a fifth lens group G5 and a sixth lens group G6.
- the intermediate group GM includes the second lens group G2 and the third lens group G3, and the intermediate lens group GRP1 includes the fourth lens group G4.
- the side lens group GRP2 is composed of a fifth lens group G5, and the subsequent group GR is composed of a sixth lens group G6.
- variable magnification optical system ZL of the present embodiment has at least five lens groups, and by changing the distance between the lens groups at the time of zooming, good aberration correction at the time of zooming can be achieved. Further, the focusing lens group can be reduced in size and weight by performing focusing using the subsequent lens group GRP2 as the focusing lens group. In addition, by disposing an anti-vibration lens group that can move so as to have a component in a direction perpendicular to the optical axis in order to correct image blur in the intermediate group GM, it is possible to reduce performance when blur correction is performed. Can be suppressed.
- the aperture stop is preferably arranged on the object side or the image plane side of the intermediate lens group GRP1. Further, the aperture stop may be disposed between the lenses constituting the intermediate lens group GRP1.
- the intermediate group GM has a negative refractive power in the entire region from the wide-angle end state to the telephoto end state.
- the intermediate group GM may be composed of one lens group having negative refractive power, or may be composed of two lens groups having negative refractive power.
- the intermediate group GM may be composed of two lens groups having positive / negative refractive power in order from the object side, or may be composed of two lens groups having negative / positive refractive power. .
- the subsequent group GR preferably has a negative or positive refractive power as a whole.
- the succeeding group GR may be composed of one lens group having negative refractive power, or may be composed of two lens groups having negative refractive power.
- a plurality of lens groups may be moved along the same movement locus during zooming. Specifically, it is preferable that the intermediate lens group GRP1 and at least one lens group included in the subsequent group GR are moved along the same movement locus, and further, the first lens group G1 and the intermediate lens are moved. It is better that the group GRP1 and at least one lens group included in the subsequent group GR are moved along the same movement locus.
- variable magnification optical system ZL has a subgroup in which the intermediate group GM satisfies the following conditional expression.
- Conditional expression (1) defines an appropriate range of the ratio between the focal length of the subgroup (arranged in the intermediate group GM) and the focal length of the intermediate group GM in the telephoto end state.
- conditional expression (1) it is possible to suppress the occurrence of various aberrations including spherical aberration during zooming and various aberrations including decentered coma when blurring correction is performed. it can.
- the partial group includes a case where a part of a certain lens group included in the intermediate group GM is shown and a case where all the lenses of a certain lens group included in the intermediate group GM are shown. .
- conditional expression (1) If the corresponding value of the conditional expression (1) exceeds the upper limit value, the refractive power of the intermediate group GM becomes strong, and it becomes difficult to suppress fluctuations of various aberrations including spherical aberration during zooming.
- the upper limit of conditional expression (1) By setting the upper limit of conditional expression (1) to 2.3, the effect of the present embodiment can be made more reliable. In order to further secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 2.1.
- conditional expression (1) If the corresponding value of conditional expression (1) is below the lower limit value, the refractive power of the subgroup becomes strong, and it becomes difficult to suppress the occurrence of various aberrations such as decentering coma when performing blur correction. .
- the lower limit of conditional expression (1) By setting the lower limit of conditional expression (1) to 1.5, the effect of this embodiment can be made more reliable. In order to ensure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (1) to 1.6.
- Conditional expression (2) defines an appropriate range of the ratio between the focal length of the subgroup (arranged in the intermediate group GM) and the focal length of the variable magnification optical system ZL in the telephoto end state.
- conditional expression (2) When the corresponding value of conditional expression (2) exceeds the upper limit value, the refractive power of the subgroup becomes weak, and the amount of movement of the image stabilizing lens group in the direction perpendicular to the optical axis for blur correction increases. For this reason, the size of the lens barrel is increased, and it is difficult to suppress the occurrence of various aberrations including decentration coma.
- the upper limit of conditional expression (2) By setting the upper limit of conditional expression (2) to 0.33, the effect of this embodiment can be made more reliable. In order to further secure the effect of this embodiment, it is preferable to set the upper limit of conditional expression (2) to 0.31.
- conditional expression (2) If the corresponding value of conditional expression (2) is below the lower limit value, the refractive power of the subgroup increases, making it difficult to suppress the occurrence of various aberrations including decentered coma when blur correction is performed. .
- the lower limit of conditional expression (2) By setting the lower limit of conditional expression (2) to 0.17, the effect of this embodiment can be made more reliable. In order to further secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (2) to 0.19.
- the partial group (arranged in the intermediate group GM) is an anti-vibration lens group movable so as to have a component in a direction perpendicular to the optical axis in order to correct image blur. Preferably there is. As a result, it is possible to effectively suppress performance degradation when blur correction is performed.
- variable magnification optical system of the present embodiment satisfies the following conditional expression (3). 2.9 ⁇ f1 / ( ⁇ fMt) ⁇ 5.5 (3) Where f1: focal length of the first lens group G1.
- Conditional expression (3) defines an appropriate range of the ratio between the focal length of the first lens group G1 and the focal length of the intermediate group GM in the telephoto end state. By satisfying conditional expression (3), it is possible to suppress fluctuations in various aberrations including spherical aberration during zooming.
- conditional expression (3) If the corresponding value of the conditional expression (3) exceeds the upper limit value, the refractive power of the intermediate group GM becomes strong, and it becomes difficult to suppress fluctuations of various aberrations including spherical aberration at the time of zooming.
- the upper limit of conditional expression (3) By setting the upper limit of conditional expression (3) to 5.2, the effect of this embodiment can be made more reliable. In order to further secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (3) to 4.9.
- conditional expression (3) When the corresponding value of conditional expression (3) is below the lower limit, the refractive power of the first lens group G1 becomes strong, and it becomes difficult to correct various aberrations including spherical aberration during zooming.
- the lower limit of conditional expression (3) By setting the lower limit of conditional expression (3) to 3.1, the effect of this embodiment can be made more reliable. In order to further secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (3) to 3.3.
- the first lens group G1 moves to the object side when zooming from the wide-angle end state to the telephoto end state.
- the total lens length in the wide-angle end state can be shortened, and the variable magnification optical system can be miniaturized.
- the rear lens group GRP2 includes at least one lens having a positive refractive power and at least one lens having a negative refractive power.
- variable magnification optical system of the present embodiment satisfies the following conditional expression (4).
- fP focal length of the lens having the strongest positive refractive power in the rear lens group GRP2.
- fN focal length of the lens having the strongest negative refractive power in the rear lens group GRP2.
- Conditional expression (4) indicates that the ratio of the focal length of the lens having the strongest positive refractive power in the rear lens group GRP2 and the focal length of the lens having the strongest negative refractive power in the rear lens group GRP2 is appropriate. It defines the range. By satisfying conditional expression (4), fluctuations in various aberrations including spherical aberration during focusing can be suppressed.
- conditional expression (4) When the corresponding value of the conditional expression (4) exceeds the upper limit value, the refractive power of the lens having the strongest negative refractive power in the succeeding side lens group GRP2 is increased, and various aberrations including spherical aberration at the time of focusing are increased. It becomes difficult to suppress fluctuations.
- the upper limit value of conditional expression (4) By setting the upper limit value of conditional expression (4) to 0.75, the effect of the present embodiment can be made more reliable. In order to further secure the effect of the present embodiment, it is preferable to set the upper limit value of conditional expression (4) to 0.70.
- the refractive power of the lens having the strongest positive refractive power in the succeeding lens group GRP2 becomes strong, and various aberrations including spherical aberration at the time of focusing are increased. It becomes difficult to suppress fluctuations.
- the lower limit of conditional expression (4) it is preferable to set the lower limit of conditional expression (4) to 0.30.
- the first lens group G1 includes a 1-1 lens having a positive refractive power and a 1-2 lens having a negative refractive power, which are arranged in order from the object side. It is preferable to have a first to third lens having a positive refractive power. Thereby, spherical aberration and chromatic aberration can be corrected effectively.
- variable magnification optical system of the present embodiment satisfies the following conditional expression (5). 0.85 ⁇ nP / nN ⁇ 1.00 (5)
- nP the refractive index of the lens having the strongest positive refractive power in the first lens group G1
- nN the refractive index of the lens having the strongest negative refractive power in the first lens group G1.
- Conditional expression (5) is an appropriate ratio of the refractive index of the lens having the strongest positive refractive power in the first lens group G1 and the refractive index of the lens having the strongest negative refractive power in the first lens group G1. It defines the range.
- conditional expression (5) When the corresponding value of the conditional expression (5) exceeds the upper limit value, the refractive index of the lens having the strongest negative refractive power in the first lens group G1 becomes small, and various aberrations including spherical aberration can be corrected. It becomes difficult.
- the upper limit value of conditional expression (5) By setting the upper limit value of conditional expression (5) to 0.98, the effect of this embodiment can be made more reliable. In order to further secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (5) to 0.96.
- conditional expression (5) When the corresponding value of the conditional expression (5) is less than the lower limit value, the refractive index of the lens having the strongest positive refractive power in the first lens group G1 becomes small, the generation of spherical aberration becomes excessive, and correction is difficult. It becomes.
- the lower limit value of conditional expression (5) By setting the lower limit value of conditional expression (5) to 0.86, the effect of the present embodiment can be made more reliable. In order to further secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (5) to 0.87.
- variable magnification optical system of the present embodiment satisfies the following conditional expression (6).
- ⁇ P Abbe number of the lens having the strongest positive refractive power in the first lens group G1
- ⁇ N Abbe number of the lens having the strongest negative refractive power in the first lens group G1.
- Conditional expression (6) is an appropriate ratio between the Abbe number of the lens having the strongest positive refractive power in the first lens group G1 and the Abbe number of the lens having the strongest negative refractive power in the first lens group G1. It defines the range.
- conditional expression (6) When the corresponding value of the conditional expression (6) exceeds the upper limit value, the Abbe number of the lens having the strongest negative refractive power in the first lens group G1 becomes small, and the correction of chromatic aberration becomes excessive.
- the upper limit value of conditional expression (6) By setting the upper limit value of conditional expression (6) to 2.85, the effect of the present embodiment can be made more reliable. In order to further secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (6) to 2.80.
- conditional expression (6) If the corresponding value of conditional expression (6) is less than the lower limit value, the Abbe number of the lens having the strongest positive refractive power in the first lens group G1 becomes small, the occurrence of chromatic aberration becomes excessive, and correction is difficult. Become.
- the effect of this embodiment can be made more reliable by setting the lower limit value of conditional expression (6) to 2.30. In order to further secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (6) to 2.35.
- the optical apparatus includes the variable magnification optical system having the above-described configuration.
- a camera (optical apparatus) provided with the variable magnification optical system ZL will be described with reference to FIG.
- This camera 1 is a digital camera provided with the variable magnification optical system according to the above embodiment as a photographic lens 2 as shown in FIG.
- light from an object (subject) (not shown) is collected by the photographing lens 2 and reaches the image sensor 3.
- the light from the subject is picked up by the image pickup device 3 and recorded as a subject image in a memory (not shown).
- This camera may be a mirrorless camera or a single-lens reflex camera having a quick return mirror.
- the camera 1 equipped with the variable magnification optical system ZL as the photographic lens 2 can be reduced in size and weight by using the subsequent lens group GRP2 as a focusing lens group, and without increasing the size of the lens barrel.
- AF autofocus
- quietness during AF can be realized.
- An intermediate lens group GRP1 having a positive refractive power, a subsequent lens group GRP2 having a positive refractive power, and a subsequent group GR composed of at least one lens group are disposed (step ST1).
- the distance between the first lens group G1 and the intermediate group GM changes, the distance between the intermediate group GM and the intermediate lens group GRP1 changes, and the intermediate lens group GRP1 and the subsequent lens group GRP2 change.
- the distance between the rear lens group GRP2 and the subsequent group GR is changed (step ST2).
- the rear lens group GRP2 is configured to move during focusing (step ST3).
- each lens is arranged in the lens barrel so that the intermediate group GM has at least a partial group satisfying the conditional expressions (1) and (2) (step ST4).
- variable magnification optical system (zoom lens) ZL according to an example of the present embodiment will be described with reference to the drawings.
- 1, 6, 11, 16, 21, and 26 illustrate the configuration and refractive power distribution of the variable magnification optical system ZL ⁇ ZL (1) to ZL (6) ⁇ according to the first to sixth examples.
- FIG. At the bottom of the sectional view of the variable magnification optical systems ZL (1) to ZL (6), the movement of each lens group along the optical axis when changing magnification from the wide-angle end state (W) to the telephoto end state (T) Directions are indicated by arrows. Further, the moving direction when the subsequent lens group GRP2 focuses on an object at a short distance from infinity as a focusing lens group is indicated by an arrow together with characters “focusing”.
- each lens group is represented by a combination of a symbol G and a number, and each lens is represented by a combination of a symbol L and a number.
- the lens groups and the like are represented using combinations of codes and numbers independently for each embodiment. For this reason, even if the combination of the same code
- Tables 1 to 6 are shown below. Of these, Table 1 is the first example, Table 2 is the second example, Table 3 is the third example, Table 4 is the fourth example, and Table 5 is the first example. 5 Example, Table 6 is a table
- the surface number indicates the order of the optical surfaces from the object side along the light traveling direction, and R indicates the radius of curvature of each optical surface (the surface where the center of curvature is located on the image side).
- D is a positive value
- D is a surface interval that 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 d-line
- ⁇ d is optical The Abbe numbers based on the d-line of the material of the member are shown respectively.
- the object plane indicates the object plane
- the curvature radius “ ⁇ ” indicates a plane or aperture
- (aperture S) indicates the aperture stop S
- the image plane indicates the image plane I.
- Description of the refractive index of air nd 1.000 is omitted.
- f is the focal length of the entire lens system
- FNO is the F number
- 2 ⁇ is the angle of view (unit is ° (degree)
- ⁇ is the half angle of view
- Ymax is the maximum image height.
- Show. TL indicates a distance obtained by adding BF to the distance from the forefront lens to the final lens surface on the optical axis at the time of focusing on infinity
- BF is an image from the final lens surface on the optical axis at the time of focusing on infinity.
- the distance to the surface I (back focus) is shown.
- the table of [Variable distance data] indicates the surface distance at the surface number where the surface distance is “variable” in the table indicating [Lens specifications].
- W wide angle end
- M intermediate focal length
- T telephoto end
- mm is generally used for the focal length f, curvature radius R, surface distance D, and other lengths, etc. unless otherwise specified, but the optical system is proportionally enlarged. Alternatively, the same optical performance can be obtained even by proportional reduction, and the present invention is not limited to this.
- FIG. 1 is a diagram showing a lens configuration of a variable magnification optical system according to the first example of the present embodiment.
- the variable magnification optical system ZL (1) according to the first example includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive lens arranged in order from the object side.
- the first to fifth lens groups G1 to G5 move in directions indicated by arrows in FIG.
- the second lens group G2 constitutes an intermediate group GM
- the third lens group G3 and the aperture stop S constitute an intermediate lens group GRP1
- the fourth lens group G4 constitutes a subsequent lens group GRP2.
- the fifth lens group G5 constitutes the subsequent group GR.
- the sign (+) or ( ⁇ ) attached to each lens group symbol indicates the refractive power of each lens group, and this is the same in all the following embodiments.
- the first lens group G1 includes a biconvex positive lens (1-1 lens) L11 arranged in order from the object side, a negative meniscus lens (1-2 lens) L12 having a convex surface facing the object side, and an object. And a cemented positive lens composed of a positive meniscus lens (first-3 lens) L13 having a convex surface directed to the side.
- the second lens group G2 includes a negative meniscus lens L21 having a convex surface directed toward the object side, a positive meniscus lens L22 having a convex surface directed toward the object side, a biconcave negative lens L23, and an object side. And a cemented negative lens composed of a positive meniscus lens L24 having a convex surface directed toward the surface.
- the third lens group G3 includes a biconvex positive lens L31, and a cemented positive lens including a biconvex positive lens L32 and a biconcave negative lens L33, which are arranged in order from the object side.
- the aperture stop S is provided in the vicinity of the image side of the third lens group G3, and moves integrally with the third lens group G3 during zooming.
- the fourth lens group G4 includes a biconvex positive lens L41 and a cemented positive lens including a negative meniscus lens L42 having a concave surface directed toward the object side.
- the fifth lens group G5 includes, in order from the object side, a biconcave negative lens L51, a positive meniscus lens L52 with a concave surface facing the object side, a negative meniscus lens L53 with a concave surface facing the object side, And a convex positive lens L54.
- An image plane I is disposed on the image side of the fifth lens group G5.
- the fourth lens group G4 (the subsequent lens group GRP2) is moved in the object direction, thereby focusing from a long distance object to a short distance object. Is called.
- the cemented negative lens including the negative lens L23 and the positive meniscus lens L24 of the second lens group G2 can be moved in a direction perpendicular to the optical axis.
- a vibration lens group (partial group) is configured to correct displacement of the imaging position (image blur on the image plane I) due to camera shake or the like.
- the focal length of the entire system is f and the image stabilization coefficient (the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) is K
- the rotational shake at an angle ⁇ is corrected.
- the moving lens group for blur correction may be moved in the direction orthogonal to the optical axis by (f ⁇ tan ⁇ ) / K.
- the image stabilization coefficient is 0.97 and the focal length is 72.1 mm. Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.30 ° is as follows. 0.39 mm.
- the image stabilization coefficient is 2.01 and the focal length is 292.0 mm
- the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.20 ° is as follows. 0.51 mm.
- Table 1 below lists values of specifications of the optical system according to the first example.
- FIGS. 4A and 4B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system having the image stabilization function according to the first example, and 0.20 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- FIG. 3 is a diagram of various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system having the image stabilization function according to the first example.
- FIGS. 4A and 4B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system having the image stabilization function according to the first example, and 0.20 °, respectively.
- 5 (a), 5 (b), and 5 (c), respectively, are in close focus at 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 example.
- FIG. 1 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- FNO represents the F number
- NA represents the numerical aperture
- Y represents the 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
- the coma diagram shows the value of each image height.
- the solid line indicates the sagittal image plane
- the broken line indicates the meridional image plane.
- the same reference numerals as those in this example are used, and redundant description is omitted.
- variable magnification optical system according to the first example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has excellent imaging performance.
- FIG. 6 is a diagram showing a lens configuration of the variable magnification optical system according to the second example of the present embodiment.
- the variable magnification optical system ZL (2) according to the second example includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive lens arranged in order from the object side.
- the first to fifth lens groups G1 to G5 move in directions indicated by arrows in FIG.
- the second lens group G2 constitutes an intermediate group GM
- the third lens group G3 and the aperture stop S constitute an intermediate lens group GRP1
- the fourth lens group G4 constitutes a subsequent lens group GRP2.
- the fifth lens group G5 constitutes the subsequent group GR.
- the first lens group G1 includes a biconvex positive lens (1-1 lens) L11 arranged in order from the object side, a negative meniscus lens (1-2 lens) L12 having a convex surface facing the object side, and an object. And a cemented positive lens composed of a positive meniscus lens (first-3 lens) L13 having a convex surface directed to the side.
- the second lens group G2 includes a negative meniscus lens L21 having a convex surface directed toward the object side, a negative meniscus lens L22 having a concave surface directed toward the object side, and a positive meniscus lens having a convex surface directed toward the object side.
- the third lens group G3 includes a biconvex positive lens L31, and a cemented positive lens including a biconvex positive lens L32 and a biconcave negative lens L33, which are arranged in order from the object side.
- the aperture stop S is provided in the vicinity of the image side of the third lens group G3, and moves integrally with the third lens group G3 during zooming.
- the fourth lens group G4 includes a biconvex positive lens L41 and a cemented positive lens including a negative meniscus lens L42 having a concave surface directed toward the object side.
- the fifth lens group G5 includes, in order from the object side, a biconcave negative lens L51, a biconvex positive lens L52, a negative meniscus lens L53 with a concave surface facing the object, and a biconvex positive Lens L54.
- An image plane I is disposed on the image side of the fifth lens group G5.
- variable magnification optical system ZL (2) In the variable magnification optical system ZL (2) according to the second example, the fourth lens group G4 (following lens group GRP2) is moved in the object direction, thereby focusing from a long distance object to a short distance object. Is called.
- the cemented negative lens including the negative lens L24 and the positive meniscus lens L25 in the second lens group G2 is movable in a direction perpendicular to the optical axis.
- a vibration lens group (partial group) is configured to correct displacement of the imaging position (image blur on the image plane I) due to camera shake or the like.
- the focal length of the entire system is f and the image stabilization coefficient (the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) is K
- the rotational shake at an angle ⁇ is corrected.
- the moving lens group for blur correction may be moved in the direction orthogonal to the optical axis by (f ⁇ tan ⁇ ) / K.
- the image stabilization coefficient is 0.97 and the focal length is 72.1 mm. Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.30 ° is 0.39 mm.
- the image stabilization coefficient is 2.03 and the focal length is 292.0 mm. Therefore, the amount of movement of the image stabilization lens group for correcting the rotational blur of 0.20 ° is as follows. 0.50 mm.
- Table 2 below lists values of specifications of the optical system according to the second example.
- FIGS. 7A and 7B are diagrams showing various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the second example, and 0.30 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- FIG. 8 is a diagram of various aberrations when focusing on infinity in the intermediate focal length state of the variable magnification optical system having the image stabilization function according to the second example.
- FIGS. 9A and 9B are diagrams showing various aberrations when focusing at infinity in the telephoto end state of the variable magnification optical system having the image stabilization function according to the second example, and 0.20 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- 10 (a), 10 (b), and 10 (c) respectively show the close-up focusing in 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 example.
- FIG. 10 (a), 10 (b), and 10 (c) respectively show the close-up focusing in 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 example.
- variable magnification optical system according to the second example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has excellent imaging performance.
- FIG. 11 is a diagram showing a lens configuration of the variable magnification optical system according to the third example of the present embodiment.
- the variable magnification optical system ZL (3) according to the third example includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive lens arranged in order from the object side.
- the first to fifth lens groups G1 to G5 move in directions indicated by arrows in FIG. 11, respectively.
- the second lens group G2 constitutes an intermediate group GM
- the third lens group G3 and the aperture stop S constitute an intermediate lens group GRP1
- the fourth lens group G4 constitutes a subsequent lens group GRP2.
- the fifth lens group G5 constitutes the subsequent group GR.
- the first lens group G1 includes a biconvex positive lens (1-1 lens) L11 arranged in order from the object side, a negative meniscus lens (1-2 lens) L12 having a convex surface facing the object side, and an object. And a cemented positive lens composed of a positive meniscus lens (first-3 lens) L13 having a convex surface directed to the side.
- the second lens group G2 includes a negative meniscus lens L21 having a convex surface directed toward the object side, a positive meniscus lens L22 having a convex surface directed toward the object side, a biconcave negative lens L23, and an object side. And a cemented negative lens composed of a positive meniscus lens L24 having a convex surface directed toward the surface.
- the third lens group G3 includes a biconvex positive lens L31, and a cemented positive lens including a biconvex positive lens L32 and a biconcave negative lens L33, which are arranged in order from the object side.
- the aperture stop S is provided in the vicinity of the image side of the third lens group G3, and moves integrally with the third lens group G3 during zooming.
- the fourth lens group G4 includes a biconvex positive lens L41 and a cemented positive lens including a negative meniscus lens L42 having a concave surface directed toward the object side.
- the fifth lens group G5 includes, in order from the object side, a biconcave negative lens L51, a biconcave negative lens L52, a biconvex positive lens L53, and a negative meniscus with a concave surface facing the object side.
- An image plane I is disposed on the image side of the fifth lens group G5.
- the fourth lens group G4 (rear lens group GRP2) is moved in the object direction, thereby focusing from a long distance object to a short distance object. Is called.
- the cemented negative lens including the negative lens L23 and the positive meniscus lens L24 of the second lens group G2 is movable in a direction perpendicular to the optical axis.
- a vibration lens group (partial group) is configured to correct displacement of the imaging position (image blur on the image plane I) due to camera shake or the like.
- the focal length of the entire system is f and the image stabilization coefficient (the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) is K
- the rotational shake at an angle ⁇ is corrected.
- the moving lens group for blur correction may be moved in the direction orthogonal to the optical axis by (f ⁇ tan ⁇ ) / K.
- the image stabilization coefficient is 0.96 and the focal length is 72.1 mm. Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.30 ° is 0.39 mm.
- the image stabilization coefficient is 1.99 and the focal length is 292.0 mm
- the amount of movement of the image stabilization lens group for correcting the 0.20 ° rotational blur is 0.51 mm.
- Table 3 lists the values of the specifications of the optical system according to the third example.
- FIGS. 14A and 14B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system having the image stabilization function according to the third example, and 0.20 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- FIG. 13 is a diagram of various aberrations at the time of focusing at infinity in the intermediate focal length state of the variable magnification optical system having the image stabilization function according to the third example.
- FIGS. 14A and 14B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system having the image stabilization function according to the third example, and 0.20 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- 15 (a), 15 (b), and 15 (c) respectively show the close-up focusing in 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 example.
- FIG. 15 (a), 15 (b), and 15 (c) respectively show the close-up focusing in 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 example.
- variable magnification optical system according to the third example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has excellent imaging performance.
- FIG. 16 is a diagram showing a lens configuration of a variable magnification optical system according to the fourth example of the present embodiment.
- the variable magnification optical system ZL (4) according to the fourth example includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive lens arranged in order from the object side.
- the first to fifth lens groups G1 to G5 move in directions indicated by arrows in FIG.
- the second lens group G2 constitutes an intermediate group GM
- the third lens group G3 and the aperture stop S constitute an intermediate lens group GRP1
- the fourth lens group G4 constitutes a subsequent lens group GRP2.
- the fifth lens group G5 constitutes the subsequent group GR.
- the first lens group G1 includes a biconvex positive lens (1-1 lens) L11 arranged in order from the object side, a negative meniscus lens (1-2 lens) L12 having a convex surface facing the object side, and an object. And a cemented positive lens composed of a positive meniscus lens (first-3 lens) L13 having a convex surface directed to the side.
- the second lens group G2 includes a negative meniscus lens L21 having a convex surface directed toward the object side, a positive meniscus lens L22 having a convex surface directed toward the object side, a biconcave negative lens L23, and an object side. And a cemented negative lens composed of a positive meniscus lens L24 having a convex surface directed toward the surface.
- the third lens group G3 includes a biconvex positive lens L31, and a cemented positive lens including a biconvex positive lens L32 and a biconcave negative lens L33, which are arranged in order from the object side.
- the aperture stop S is provided in the vicinity of the image side of the third lens group G3, and moves integrally with the third lens group G3 during zooming.
- the fourth lens group G4 includes a biconvex positive lens L41 arranged in order from the object side, and a negative meniscus lens L42 having a concave surface facing the object side.
- the fifth lens group G5 includes a negative meniscus lens L51 having a convex surface directed toward the object side, a positive meniscus lens L52 having a concave surface directed toward the object side, and a negative meniscus lens having a concave surface directed toward the object side. L53 and a biconvex positive lens L54.
- An image plane I is disposed on the image side of the fifth lens group G5.
- the fourth lens group G4 (the subsequent lens group GRP2) is moved in the object direction, thereby focusing from a long distance object to a short distance object. Is called.
- the cemented negative lens including the negative lens L23 and the positive meniscus lens L24 in the second lens group G2 is movable in a direction perpendicular to the optical axis.
- a vibration lens group (partial group) is configured to correct displacement of the imaging position (image blur on the image plane I) due to camera shake or the like.
- the focal length of the entire system is f and the image stabilization coefficient (the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) is K
- the rotational shake at an angle ⁇ is corrected.
- the moving lens group for blur correction may be moved in the direction orthogonal to the optical axis by (f ⁇ tan ⁇ ) / K.
- the image stabilization coefficient in the wide-angle end state, the image stabilization coefficient is 0.99 and the focal length is 72.1 mm. Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.30 ° is 0.38 mm.
- the image stabilization coefficient is 2.04 and the focal length is 292.0 mm. Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.20 ° is as follows. 0.50 mm.
- Table 4 lists values of specifications of the optical system according to the fourth example.
- FIGS. 17A and 17B are graphs showing various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the fourth example, and 0.30 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- FIG. 18 is a diagram of various aberrations when focusing on infinity in the intermediate focal length state of the variable magnification optical system having the image stabilization function according to the fourth example.
- FIGS. 19A and 19B are graphs showing various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system having the image stabilization function according to the fourth example, and 0.20 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur. 20 (a), 20 (b), and 20 (c), respectively, at the time of close focus in 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 example.
- FIG. 1 is a meridional transverse aberration diagram when blur correction is performed for rotational blur. 20 (a), 20 (b), and 20 (c), respectively, at the time of close focus in 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 example.
- variable magnification optical system according to the fourth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has excellent imaging performance.
- FIG. 21 is a diagram showing a lens configuration of a variable magnification optical system according to the fifth example of the present embodiment.
- the variable magnification optical system ZL (5) according to the fifth example includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive lens arranged in order from the object side.
- 6 lens group G6 is a diagram showing a lens configuration of a variable magnification optical system according to the fifth example of the present embodiment.
- the variable magnification optical system ZL (5) according to the fifth example includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a
- the first to sixth lens groups G1 to G6 move in directions indicated by arrows in FIG.
- the second lens group G2 constitutes an intermediate group GM
- the third lens group G3 and the aperture stop S constitute an intermediate lens group GRP1
- the fourth lens group G4 constitutes a subsequent lens group GRP2.
- the fifth lens group G5 and the sixth lens group G6 constitute the subsequent group GR.
- the succeeding group GR has a negative refractive power as a whole.
- the first lens group G1 includes a biconvex positive lens (1-1 lens) L11 arranged in order from the object side, a negative meniscus lens (1-2 lens) L12 having a convex surface facing the object side, and an object. And a cemented positive lens composed of a positive meniscus lens (first-3 lens) L13 having a convex surface directed to the side.
- the second lens group G2 includes a negative meniscus lens L21 having a convex surface directed toward the object side, a positive meniscus lens L22 having a convex surface directed toward the object side, a biconcave negative lens L23, and an object side. And a cemented negative lens composed of a positive meniscus lens L24 having a convex surface directed toward the surface.
- the third lens group G3 includes a biconvex positive lens L31, and a cemented positive lens including a biconvex positive lens L32 and a biconcave negative lens L33, which are arranged in order from the object side.
- the aperture stop S is provided in the vicinity of the image side of the third lens group G3, and moves integrally with the third lens group G3 during zooming.
- the fourth lens group G4 includes a biconvex positive lens L41 arranged in order from the object side, and a negative meniscus lens L42 having a concave surface facing the object side.
- the fifth lens group G5 includes a negative meniscus lens L51 having a convex surface facing the object side and a positive meniscus lens L52 having a concave surface facing the object side, which are arranged in order from the object side.
- the sixth lens group G6 is composed of a negative meniscus lens L61 having a concave surface directed toward the object side and a biconvex positive lens L62 arranged in order from the object side.
- An image plane I is disposed on the image side of the sixth lens group G6.
- variable magnification optical system ZL (5) In the variable magnification optical system ZL (5) according to the fifth example, the fourth lens group G4 (following lens group GRP2) is moved in the object direction, thereby focusing from a long distance object to a short distance object. Is called.
- the cemented negative lens including the negative lens L23 and the positive meniscus lens L24 of the second lens group G2 is movable in a direction perpendicular to the optical axis.
- a vibration lens group (partial group) is configured to correct displacement of the imaging position (image blur on the image plane I) due to camera shake or the like.
- the focal length of the entire system is f and the image stabilization coefficient (the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) is K
- the rotational shake at an angle ⁇ is corrected.
- the moving lens group for blur correction may be moved in the direction orthogonal to the optical axis by (f ⁇ tan ⁇ ) / K.
- the image stabilization coefficient is 1.00 and the focal length is 72.1 mm. Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.30 ° is 0.38 mm.
- the image stabilization coefficient is 2.07 and the focal length is 292.0 mm
- the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.20 ° is 0.49 mm.
- Table 5 lists values of specifications of the optical system according to the fifth example.
- FIGS. 22A and 22B are diagrams showing various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the fifth example, and 0.30 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- FIG. 23 is a diagram of various aberrations at the time of focusing at infinity in the intermediate focal length state of the variable magnification optical system having the image stabilization function according to the fifth example.
- FIGS. 24A and 24B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system having the image stabilization function according to the fifth example, and 0.20 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- FIGS. 25 (a), 25 (b), and 25 (c) are respectively close-focused in 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 example.
- FIG. 25 (a), 25 (b), and 25 (c) are respectively close-focused in 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 example.
- variable magnification optical system according to the fifth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has excellent imaging performance.
- FIG. 26 is a diagram showing a lens configuration of a variable magnification optical system according to the sixth example of the present embodiment.
- the zoom optical system ZL (6) according to the sixth example includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a negative lens arranged in order from the object side.
- 6 lens group G6 is a diagram showing a lens configuration of a variable magnification optical system according to the sixth example of the present embodiment.
- the zoom optical system ZL (6) according to the sixth example includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a negative lens arranged in
- the first to sixth lens groups G1 to G6 move in directions indicated by arrows in FIG.
- the second lens group G2 and the third lens group G3 constitute an intermediate group GM
- the fourth lens group G4 and the aperture stop S constitute an intermediate lens group GRP1
- the fifth lens group G5 follows.
- the side lens group GRP2 is configured
- the sixth lens group G6 configures the subsequent group GR.
- the intermediate group GM has a negative refractive power as a whole.
- the first lens group G1 includes a biconvex positive lens (1-1 lens) L11 arranged in order from the object side, a negative meniscus lens (1-2 lens) L12 having a convex surface facing the object side, and an object. And a cemented positive lens composed of a positive meniscus lens (first-3 lens) L13 having a convex surface directed to the side.
- the second lens group G2 includes a negative meniscus lens L21 having a convex surface facing the object side and a positive meniscus lens L22 having a convex surface facing the object side, which are arranged in order from the object side.
- the third lens group G3 includes a cemented negative lens including a biconcave negative lens L23 and a positive meniscus lens L24 having a convex surface directed toward the object side.
- the fourth lens group G4 includes a biconvex positive lens L41, and a cemented positive lens including a biconvex positive lens L42 and a biconcave negative lens L43, which are arranged in order from the object side.
- the aperture stop S is provided in the vicinity of the image side of the fourth lens group G4, and moves integrally with the fourth lens group G4 during zooming.
- the fifth lens group G5 includes a biconvex positive lens L51 and a cemented positive lens including a negative meniscus lens L52 having a concave surface directed toward the object side.
- the sixth lens group G6 includes a biconcave negative lens L61 arranged in order from the object side, a positive meniscus lens L62 with a concave surface facing the object side, a negative meniscus lens L63 with a concave surface facing the object side, And a positive lens L64 having a convex shape.
- An image plane I is disposed on the image side of the sixth lens group G6.
- variable magnification optical system ZL (6) In the variable magnification optical system ZL (6) according to the sixth example, the fifth lens group G5 (following lens group GRP2) is moved in the object direction, thereby focusing from a long distance object to a short distance object. Is called.
- all the lenses (junction negative lenses) of the third lens group G3 are movable in the direction perpendicular to the optical axis (partial). Group), and the displacement of the imaging position (image blur on the image plane I) due to camera shake or the like is corrected.
- the focal length of the entire system is f and the image stabilization coefficient (the ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction) is K
- the rotational shake at an angle ⁇ is corrected.
- the moving lens group for blur correction may be moved in the direction orthogonal to the optical axis by (f ⁇ tan ⁇ ) / K.
- the image stabilization coefficient is 0.97 and the focal length is 72.1 mm. Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.30 ° is 0.39 mm.
- the image stabilization coefficient is 2.01 and the focal length is 292.0 mm
- the amount of movement of the image stabilization lens group for correcting 0.20 ° rotational blur is 0.51 mm.
- Table 6 below lists values of specifications of the optical system according to the sixth example.
- FIGS. 27A and 27B are diagrams showing various aberrations at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the sixth example, and 0.30 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- FIG. 28 is a diagram of various aberrations at the time of focusing at infinity in the intermediate focal length state of the variable magnification optical system having the image stabilization function according to the sixth example.
- FIGS. 29A and 29B are diagrams showing various aberrations at the time of focusing on infinity in the telephoto end state of the variable magnification optical system having the image stabilization function according to the sixth example, and 0.20 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when blur correction is performed for rotational blur.
- 30 (a), 30 (b), and 30 (c), respectively, are in close focus at 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 example.
- variable magnification optical system according to the sixth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has excellent imaging performance.
- the subsequent lens group GRP2 is reduced in size and weight as a focusing lens group, so that high-speed AF (autofocus) and quietness during AF can be achieved without increasing the size of the lens barrel.
- AF autofocus
- the subsequent lens group GRP2 is reduced in size and weight as a focusing lens group, so that high-speed AF (autofocus) and quietness during AF can be achieved without increasing the size of the lens barrel.
- each of the above embodiments shows a specific example of the present invention, and the present invention is not limited to these.
- variable magnification optical system of the present embodiment a five-group configuration and a six-group configuration are shown. However, the present application is not limited to this, and other group configurations (e.g., seven groups) have variable magnification.
- An optical system can also be configured. Specifically, a configuration in which a lens or a lens group is added to the most object side or the most image plane side of the variable magnification optical system of the present embodiment may be used.
- the lens group refers to a portion having at least one lens separated by an air interval that changes during zooming.
- the focusing lens group indicates a portion having at least one lens separated by an air interval that changes during focusing. That is, a single lens group, a plurality of lens groups, or a partial lens group may be moved in the optical axis direction to be a focusing lens group that performs focusing from an object at infinity to a near object.
- This focusing lens group can be applied to autofocus, and is also suitable for driving a motor for autofocus (using an ultrasonic motor or the like).
- the lens surface may be formed as a spherical or flat surface or an aspherical surface.
- lens processing and assembly adjustment are facilitated, and optical performance deterioration due to errors in processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance.
- the aspheric surface is an aspheric surface by grinding, a glass mold aspheric surface made of glass with an aspheric shape, or a composite aspheric surface made of resin with an aspheric shape on the glass surface. Either is fine.
- the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
- the aperture stop is preferably disposed in the vicinity of the third lens group or the fourth lens group.
- the aperture stop may be disposed in the third lens group or the fourth lens group, and no member as an aperture stop is provided.
- the role of the lens may be substituted.
- Each lens surface may be provided with an antireflection film having high transmittance in a wide wavelength range in order to reduce flare and ghost and achieve high contrast optical performance. Thereby, flare and ghost can be reduced, and high optical performance with high contrast can be achieved.
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- Physics & Mathematics (AREA)
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- Nonlinear Science (AREA)
Abstract
Description
0.15<(-fvr)/ft<0.35
但し、fvr:前記部分群の焦点距離、
fMt:望遠端状態における前記中間群の焦点距離、
ft:望遠端状態における前記変倍光学系の焦点距離。
1.4<fvr/fMt<2.5
0.15<(-fvr)/ft<0.35
但し、fvr:前記部分群の焦点距離、
fMt:望遠端状態における前記中間群の焦点距離、
ft:望遠端状態における前記変倍光学系の焦点距離。
0.15<(-fvr)/ft<0.35 ・・・(2)
但し、fvr:部分群の焦点距離、
fMt:望遠端状態における中間群GMの焦点距離、
ft:望遠端状態における変倍光学系ZLの焦点距離。
2.9<f1/(-fMt)<5.5 ・・・(3)
但し、f1:第1レンズ群G1の焦点距離。
0.2<fP/(-fN)<0.8 ・・・(4)
但し、fP:後続側レンズ群GRP2内の最も正の屈折力が強いレンズの焦点距離、
fN:後続側レンズ群GRP2内の最も負の屈折力が強いレンズの焦点距離。
0.85<nP/nN<1.00 ・・・(5)
但し、nP:第1レンズ群G1内の最も正の屈折力が強いレンズの屈折率、
nN:第1レンズ群G1内の最も負の屈折力が強いレンズの屈折率。
2.25<νP/νN<2.90 ・・・(6)
但し、νP:第1レンズ群G1内の最も正の屈折力が強いレンズのアッベ数、
νN:第1レンズ群G1内の最も負の屈折力が強いレンズのアッベ数。
第1実施例について、図1~図5および表1を用いて説明する。図1は、本実施形態の第1実施例に係る変倍光学系のレンズ構成を示す図である。第1実施例に係る変倍光学系ZL(1)は、物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、開口絞りSと、正の屈折力を有する第4レンズ群G4と、負の屈折力を有する第5レンズ群G5とから構成されている。広角端状態(W)から望遠端状態(T)に変倍する際、第1~第5レンズ群G1~G5がそれぞれ図1の矢印で示す方向に移動する。本実施例では、第2レンズ群G2が中間群GMを構成し、第3レンズ群G3および開口絞りSが中間側レンズ群GRP1を構成し、第4レンズ群G4が後続側レンズ群GRP2を構成し、第5レンズ群G5が後続群GRを構成する。各レンズ群記号に付けている符号(+)もしくは(-)は各レンズ群の屈折力を示し、このことは以下の全ての実施例でも同様である。
[レンズ諸元]
面番号 R D nd νd
物面 ∞
1 443.9646 3.817 1.48749 70.31
2 -469.6963 0.200
3 100.9381 1.700 1.67270 32.19
4 64.8256 8.767 1.49700 81.73
5 2578.1121 可変
6 189.1236 1.000 1.77250 49.62
7 35.4799 7.123
8 37.2041 2.691 1.80518 25.45
9 57.9432 4.513
10 -64.2854 1.000 1.67003 47.14
11 37.2626 3.500 1.75520 27.57
12 146.7584 可変
13 107.2202 3.817 1.80610 40.97
14 -71.1994 0.200
15 41.9753 5.272 1.49700 81.73
16 -54.1569 1.000 1.85026 32.35
17 154.3187 1.508
18 ∞ 可変 (絞りS)
19 104.1819 4.528 1.51680 63.88
20 -28.6539 1.000 1.80100 34.92
21 -53.7161 可変
22 -120.9949 1.000 1.90366 31.27
23 61.5584 10.276
24 -319.9239 4.049 1.68893 31.16
25 -33.0322 16.448
26 -24.1471 1.000 1.77250 49.62
27 -213.3380 0.200
28 79.7473 3.205 1.71736 29.57
29 -323.3417 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 99.9 292.0
FNO 4.54 4.73 5.88
2ω 33.60 23.92 8.26
Ymax 21.60 21.60 21.60
TL 193.31 211.69 248.31
BF 38.31 41.11 61.31
[可変間隔データ]
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.000 26.394 73.625 2.000 26.394 73.625
d12 41.625 32.810 2.000 41.625 32.810 2.000
d18 21.563 20.201 21.407 20.665 19.062 19.151
d21 2.000 3.362 2.156 2.899 4.501 4.413
[レンズ群データ]
群 始面 焦点距離
G1 1 169.064
G2 6 -41.090
G3 13 50.436
G4 19 100.808
G5 22 -52.611
[条件式対応値]
条件式(1) fvr/fMt=1.818
条件式(2) (-fvr)/ft=0.256
条件式(3) f1/(-fMt)=4.114
条件式(4) fP/(-fN)=0.564
条件式(5) nP/nN=0.895
条件式(6) νP/νN=2.539
第2実施例について、図6~図10および表2を用いて説明する。図6は、本実施形態の第2実施例に係る変倍光学系のレンズ構成を示す図である。第2実施例に係る変倍光学系ZL(2)は、物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、開口絞りSと、正の屈折力を有する第4レンズ群G4と、負の屈折力を有する第5レンズ群G5とから構成されている。広角端状態(W)から望遠端状態(T)に変倍する際、第1~第5レンズ群G1~G5がそれぞれ図6の矢印で示す方向に移動する。本実施例では、第2レンズ群G2が中間群GMを構成し、第3レンズ群G3および開口絞りSが中間側レンズ群GRP1を構成し、第4レンズ群G4が後続側レンズ群GRP2を構成し、第5レンズ群G5が後続群GRを構成する。
[レンズ諸元]
面番号 R D nd νd
物面 ∞
1 524.3080 3.649 1.48749 70.31
2 -473.1509 0.200
3 99.8647 1.700 1.67270 32.19
4 65.5021 8.680 1.49700 81.73
5 1712.5853 可変
6 93.5170 1.000 1.83400 37.18
7 34.3474 6.920
8 -111.6255 1.000 1.60300 65.44
9 -404.2382 0.200
10 45.6203 2.882 1.84666 23.80
11 103.2990 3.776
12 -66.2945 1.000 1.70000 48.11
13 38.4320 3.453 1.79504 28.69
14 151.5709 可変
15 101.1563 3.699 1.80400 46.60
16 -81.9293 0.200
17 39.5595 5.119 1.49700 81.73
18 -67.2517 1.000 1.85026 32.35
19 148.7139 1.531
20 ∞ 可変 (絞りS)
21 99.6360 4.438 1.51680 63.88
22 -28.3755 1.000 1.80610 40.97
23 -55.9883 可変
24 -69.2441 1.000 1.90366 31.27
25 64.7455 7.965
26 1599.2908 4.469 1.67270 32.19
27 -30.6814 16.326
28 -23.5416 1.000 1.80400 46.60
29 -175.4914 0.343
30 82.8193 3.436 1.67270 32.19
31 -167.6215 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.54 4.76 5.88
2ω 33.58 23.98 8.28
Ymax 21.60 21.60 21.60
TL 193.32 210.95 248.32
BF 38.32 41.61 61.32
[可変間隔データ]
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.000 25.989 75.552 2.000 25.989 75.552
d14 43.552 33.897 2.000 43.552 33.897 2.000
d20 21.465 19.956 21.465 20.527 18.788 19.123
d23 2.000 3.509 2.000 2.938 4.677 4.341
[レンズ群データ]
群 始面 焦点距離
G1 1 173.986
G2 6 -42.714
G3 15 49.108
G4 21 106.792
G5 24 -51.186
[条件式対応値]
条件式(1) fvr/fMt=1.743
条件式(2) (-fvr)/ft=0.255
条件式(3) f1/(-fMt)=4.073
条件式(4) fP/(-fN)=0.596
条件式(5) nP/nN=0.895
条件式(6) νP/νN=2.539
第3実施例について、図11~図15並びに表3を用いて説明する。図11は、本実施形態の第3実施例に係る変倍光学系のレンズ構成を示す図である。第3実施例に係る変倍光学系ZL(3)は、物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、開口絞りSと、正の屈折力を有する第4レンズ群G4と、負の屈折力を有する第5レンズ群G5とから構成されている。広角端状態(W)から望遠端状態(T)に変倍する際、第1~第5レンズ群G1~G5がそれぞれ図11の矢印で示す方向に移動する。本実施例では、第2レンズ群G2が中間群GMを構成し、第3レンズ群G3および開口絞りSが中間側レンズ群GRP1を構成し、第4レンズ群G4が後続側レンズ群GRP2を構成し、第5レンズ群G5が後続群GRを構成する。
[レンズ諸元]
面番号 R D nd νd
物面 ∞
1 394.8396 3.845 1.48749 70.31
2 -543.4808 0.200
3 105.1984 1.700 1.67270 32.19
4 67.0764 8.688 1.49700 81.73
5 3999.3650 可変
6 187.7927 1.000 1.83481 42.73
7 39.3002 8.392
8 40.6875 2.537 1.84666 23.80
9 61.9560 4.302
10 -65.9607 1.000 1.70000 48.11
11 47.5227 2.966 1.84666 23.80
12 155.3071 可変
13 100.1220 3.921 1.80400 46.60
14 -71.7118 0.200
15 39.6874 5.409 1.49700 81.73
16 -55.1551 1.000 1.85026 32.35
17 138.4368 1.566
18 ∞ 可変 (絞りS)
19 90.1287 4.430 1.51680 63.88
20 -29.8148 1.000 1.83400 37.18
21 -56.5509 可変
22 -89.4853 1.000 1.90366 31.27
23 58.7258 1.623
24 -119.8149 1.000 1.77250 49.62
25 125.4243 2.815
26 86.3318 5.240 1.67270 32.19
27 -30.2745 18.277
28 -22.8447 1.000 1.80400 46.60
29 -60.6486 0.200
30 89.8891 2.703 1.66446 35.87
31 3303.4609 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 99.9 292.0
FNO 4.53 4.71 5.88
2ω 33.50 23.86 8.24
Ymax 21.60 21.60 21.60
TL 193.32 211.55 248.32
BF 38.32 41.10 61.32
[可変間隔データ]
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.000 26.748 74.901 2.000 26.748 74.901
d12 42.901 33.607 2.000 42.901 33.607 2.000
d18 22.086 20.598 21.608 21.186 19.465 19.388
d21 2.000 3.489 2.479 2.900 4.621 4.698
[レンズ群データ]
群 始面 焦点距離
G1 1 172.579
G2 6 -42.044
G3 13 48.716
G4 19 101.916
G5 22 -49.748
[条件式対応値]
条件式(1) fvr/fMt=1.821
条件式(2) (-fvr)/ft=0.262
条件式(3) f1/(-fMt)=4.105
条件式(4) fP/(-fN)=0.571
条件式(5) nP/nN=0.895
条件式(6) νP/νN=2.539
第4実施例について、図16~図20および表4を用いて説明する。図16は本実施形態の第4実施例に係る変倍光学系のレンズ構成を示す図である。第4実施例に係る変倍光学系ZL(4)は、物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、開口絞りSと、正の屈折力を有する第4レンズ群G4と、負の屈折力を有する第5レンズ群G5とから構成されている。広角端状態(W)から望遠端状態(T)に変倍する際、第1~第5レンズ群G1~G5がそれぞれ図16の矢印で示す方向に移動する。本実施例では、第2レンズ群G2が中間群GMを構成し、第3レンズ群G3および開口絞りSが中間側レンズ群GRP1を構成し、第4レンズ群G4が後続側レンズ群GRP2を構成し、第5レンズ群G5が後続群GRを構成する。
[レンズ諸元]
面番号 R D nd νd
物面 ∞
1 397.7403 3.807 1.48749 70.31
2 -541.2704 0.200
3 98.5962 1.700 1.67270 32.19
4 64.4142 7.530 1.49700 81.73
5 2167.3548 可変
6 153.3759 1.000 1.80610 40.97
7 35.8256 8.557
8 37.5306 2.567 1.84666 23.80
9 55.0899 4.528
10 -64.5906 1.000 1.70000 48.11
11 45.3004 3.006 1.84666 23.80
12 146.7719 可変
13 120.3729 3.847 1.79952 42.09
14 -66.6553 0.200
15 40.5542 5.444 1.49700 81.73
16 -51.5427 1.000 1.85026 32.35
17 136.7432 1.574
18 ∞ 可変 (絞りS)
19 73.0072 4.267 1.51680 63.88
20 -41.6199 1.157
21 -36.8096 1.000 1.80100 34.92
22 -63.5855 可変
23 142.7978 1.000 1.90366 31.27
24 39.2858 5.972
25 -32.2173 2.394 1.80518 25.45
26 -25.4336 17.643
27 -22.2559 1.000 1.77250 49.62
28 -60.4849 0.200
29 133.6379 3.767 1.69895 30.13
30 -86.4148 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.58 4.77 5.88
2ω 33.52 23.92 8.28
Ymax 21.60 21.60 21.60
TL 193.32 210.92 248.32
BF 38.32 41.32 62.32
[可変間隔データ]
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.000 25.714 72.838 2.000 25.714 72.838
d12 41.838 32.720 2.000 41.838 32.720 2.000
d18 24.804 23.298 24.804 23.943 22.207 22.596
d22 2.000 3.505 2.000 2.861 4.597 4.208
[レンズ群データ]
群 始面 焦点距離
G1 1 166.403
G2 6 -40.599
G3 13 52.091
G4 19 95.393
G5 23 -58.282
[条件式対応値]
条件式(1) fvr/fMt=1.831
条件式(2) (-fvr)/ft=0.255
条件式(3) f1/(-fMt)=4.099
条件式(4) fP/(-fN)=0.468
条件式(5) nP/nN=0.895
条件式(6) νP/νN=2.539
第5実施例について、図21~図25および表5を用いて説明する。図21は本実施形態の第5実施例に係る変倍光学系のレンズ構成を示す図である。第5実施例に係る変倍光学系ZL(5)は、物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、開口絞りSと、正の屈折力を有する第4レンズ群G4と、負の屈折力を有する第5レンズ群G5と、負の屈折力を有する第6レンズ群G6とから構成されている。広角端状態(W)から望遠端状態(T)に変倍する際、第1~第6レンズ群G1~G6がそれぞれ図21の矢印で示す方向に移動する。本実施例では、第2レンズ群G2が中間群GMを構成し、第3レンズ群G3および開口絞りSが中間側レンズ群GRP1を構成し、第4レンズ群G4が後続側レンズ群GRP2を構成し、第5レンズ群G5および第6レンズ群G6が後続群GRを構成する。後続群GRは、全体として負の屈折力を有する。
[レンズ諸元]
面番号 R D nd νd
物面 ∞
1 410.0484 3.688 1.48749 70.31
2 -563.1103 0.200
3 102.5753 1.700 1.67270 32.19
4 66.0707 7.494 1.49700 81.73
5 15350.0260 可変
6 139.4435 1.000 1.80610 40.97
7 35.1229 7.231
8 37.6103 2.601 1.84666 23.80
9 56.2791 4.573
10 -62.1771 1.000 1.70000 48.11
11 45.7876 3.019 1.84666 23.80
12 152.3777 可変
13 118.3464 3.864 1.79952 42.09
14 -66.5127 0.200
15 41.1734 5.431 1.49700 81.73
16 -51.3614 1.000 1.85026 32.35
17 129.2055 1.610
18 ∞ 可変 (絞りS)
19 79.6726 4.263 1.51680 63.88
20 -41.5025 1.192
21 -36.1506 1.000 1.80100 34.92
22 -57.7482 可変
23 360.1366 1.000 1.90366 31.27
24 48.3936 6.817
25 -37.2103 2.515 1.80518 25.45
26 -27.2408 可変
27 -22.1710 1.000 1.80400 46.60
28 -62.3440 0.200
29 129.8338 3.640 1.71736 29.57
30 -94.8486 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.57 4.79 5.88
2ω 33.64 23.96 8.26
Ymax 21.60 21.60 21.60
TL 193.32 211.43 248.32
BF 38.32 41.66 60.02
[可変間隔データ]
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.000 25.563 73.573 2.000 25.563 73.573
d12 42.573 33.490 2.000 42.573 33.490 2.000
d18 24.947 23.743 24.947 24.097 22.674 22.767
d22 2.000 3.203 2.000 2.849 4.273 4.180
d26 17.243 17.537 19.544 17.243 17.537 19.544
[レンズ群データ]
群 始面 焦点距離
G1 1 168.635
G2 6 -41.024
G3 13 53.154
G4 19 92.760
G5 23 -175.236
G6 27 -106.197
[条件式対応値]
条件式(1) fvr/fMt=1.779
条件式(2) (-fvr)/ft=0.250
条件式(3) f1/(-fMt)=4.111
条件式(4) fP/(-fN)=0.434
条件式(5) nP/nN=0.895
条件式(6) νP/νN=2.539
第6実施例について、図26~図30および表6を用いて説明する。図26は本実施形態の第6実施例に係る変倍光学系のレンズ構成を示す図である。第6実施例に係る変倍光学系ZL(6)は、物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、負の屈折力を有する第2レンズ群G2と、負の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4と、開口絞りSと、正の屈折力を有する第5レンズ群G5と、負の屈折力を有する第6レンズ群G6とから構成されている。広角端状態(W)から望遠端状態(T)に変倍する際、第1~第6レンズ群G1~G6がそれぞれ図26の矢印で示す方向に移動する。本実施例では、第2レンズ群G2および第3レンズ群G3が中間群GMを構成し、第4レンズ群G4および開口絞りSが中間側レンズ群GRP1を構成し、第5レンズ群G5が後続側レンズ群GRP2を構成し、第6レンズ群G6が後続群GRを構成する。中間群GMは、全体として負の屈折力を有する。
[レンズ諸元]
面番号 R D nd νd
物面 ∞
1 508.9189 3.766 1.48749 70.31
2 -429.0392 0.200
3 100.5086 1.700 1.67270 32.19
4 64.9622 8.695 1.49700 81.73
5 2159.2215 可変
6 177.6966 1.000 1.83481 42.73
7 35.6714 6.299
8 37.8917 2.779 1.84666 23.80
9 62.3935 可変
10 -64.2559 1.000 1.67003 47.14
11 36.7145 3.536 1.75520 27.57
12 146.9123 可変
13 109.3840 3.810 1.80610 40.97
14 -70.8019 0.200
15 42.2948 5.265 1.49700 81.73
16 -53.8261 1.000 1.85026 32.35
17 161.9717 1.485
18 ∞ 可変 (絞りS)
19 106.0675 4.532 1.51680 63.88
20 -28.5067 1.000 1.80100 34.92
21 -53.2383 可変
22 -126.6137 1.000 1.90366 31.27
23 60.3618 10.455
24 -323.4470 4.054 1.68893 31.16
25 -33.1410 16.327
26 -24.3740 1.000 1.77250 49.62
27 -200.9248 0.200
28 79.6785 3.126 1.71736 29.57
29 -428.7833 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.54 4.72 5.88
2ω 33.58 23.90 8.26
Ymax 21.60 21.60 21.60
TL 193.32 211.83 248.32
BF 38.32 41.01 61.32
[可変間隔データ]
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.000 26.835 74.493 2.000 26.835 74.493
d9 5.400 5.100 4.500 5.400 5.100 4.500
d12 41.592 32.879 2.000 41.592 32.879 2.000
d18 21.578 20.267 21.578 20.680 19.126 19.320
d21 2.000 3.311 2.001 2.898 4.453 4.259
[レンズ群データ]
群 始面 焦点距離
G1 1 170.267
G2 6 -114.490
G3 10 -74.908
G4 13 50.411
G5 19 100.849
G6 22 -52.429
[条件式対応値]
条件式(1) fvr/fMt=1.807
条件式(2) (-fvr)/ft=0.257
条件式(3) f1/(-fMt)=4.107
条件式(4) fP/(-fN)=0.564
条件式(5) nP/nN=0.895
条件式(6) νP/νN=2.539
G3 第3レンズ群 G4 第4レンズ群
G5 第5レンズ群 G6 第6レンズ群
GM 中間群 GR 後続群
GRP1 中間側レンズ群 GRP2 後続側レンズ群
I 像面 S 開口絞り
Claims (11)
- 物体側から順に並んだ、正の屈折力を有する第1レンズ群と、少なくとも一つのレンズ群を有し全体で負の屈折力を有する中間群と、正の屈折力を有する中間側レンズ群と、正の屈折力を有する後続側レンズ群と、少なくとも一つのレンズ群から構成される後続群とを有し、
変倍の際、前記第1レンズ群と前記中間群との間隔が変化し、前記中間群と前記中間側レンズ群との間隔が変化し、前記中間側レンズ群と前記後続側レンズ群との間隔が変化し、前記後続側レンズ群と前記後続群との間隔が変化し、
合焦の際、前記後続側レンズ群が移動し、
前記中間群が以下の条件式を満足する部分群を有することを特徴とする変倍光学系。
1.4<fvr/fMt<2.5
0.15<(-fvr)/ft<0.35
但し、fvr:前記部分群の焦点距離、
fMt:望遠端状態における前記中間群の焦点距離、
ft:望遠端状態における前記変倍光学系の焦点距離。 - 前記部分群は、像ブレを補正するために光軸と垂直な方向の成分を有するように移動可能な防振レンズ群であることを特徴とする請求項1に記載の変倍光学系。
- 以下の条件式を満足することを特徴とする請求項1又は2に記載の変倍光学系。
2.9<f1/(-fMt)<5.5
但し、f1:前記第1レンズ群の焦点距離。 - 広角端状態から望遠端状態への変倍の際、前記第1レンズ群が物体側へ移動することを特徴とする請求項1~3のいずれかに記載の変倍光学系。
- 前記後続側レンズ群は、少なくとも一つの正の屈折力を有するレンズと、少なくとも一つの負の屈折力を有するレンズとを有することを特徴とする請求項1~4のいずれかに記載の変倍光学系。
- 以下の条件式を満足することを特徴とする請求項5に記載の変倍光学系。
0.2<fP/(-fN)<0.8
但し、fP:前記後続側レンズ群内の最も正の屈折力が強いレンズの焦点距離、
fN:前記後続側レンズ群内の最も負の屈折力が強いレンズの焦点距離。 - 前記第1レンズ群は、物体側から順に並んだ、正の屈折力を有する第1-1レンズと、負の屈折力を有する第1-2レンズと、正の屈折力を有する第1-3レンズとを有することを特徴とする請求項1~6のいずれかに記載の変倍光学系。
- 以下の条件式を満足することを特徴とする請求項7に記載の変倍光学系。
0.85<nP/nN<1.00
但し、nP:前記第1レンズ群内の最も正の屈折力が強いレンズの屈折率、
nN:前記第1レンズ群内の最も負の屈折力が強いレンズの屈折率。 - 以下の条件式を満足することを特徴とする請求項7又は8に記載の変倍光学系。
2.25<νP/νN<2.90
但し、νP:前記第1レンズ群内の最も正の屈折力が強いレンズのアッベ数、
νN:前記第1レンズ群内の最も負の屈折力が強いレンズのアッベ数。 - 請求項1~9のいずれかに記載の変倍光学系を搭載して構成される光学機器。
- 物体側から順に並んだ、正の屈折力を有する第1レンズ群と、少なくとも一つのレンズ群を有し全体で負の屈折力を有する中間群と、正の屈折力を有する中間側レンズ群と、正の屈折力を有する後続側レンズ群と、少なくとも一つのレンズ群から構成される後続群とを有して構成される変倍光学系の製造方法であって、
変倍の際、前記第1レンズ群と前記中間群との間隔が変化し、前記中間群と前記中間側レンズ群との間隔が変化し、前記中間側レンズ群と前記後続側レンズ群との間隔が変化し、前記後続側レンズ群と前記後続群との間隔が変化し、
合焦の際、前記後続側レンズ群が移動し、
前記中間群が以下の条件式を満足する部分群を有するように、
レンズ鏡筒内に各レンズを配置することを特徴とする変倍光学系の製造方法。
1.4<fvr/fMt<2.5
0.15<(-fvr)/ft<0.35
但し、fvr:前記部分群の焦点距離、
fMt:望遠端状態における前記中間群の焦点距離、
ft:望遠端状態における前記変倍光学系の焦点距離。
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