WO2008010563A1 - Système optique à puissance variable, dispositif d'imagerie, procédé d'agrandissement variable d'un système optique à puissance variable - Google Patents
Système optique à puissance variable, dispositif d'imagerie, procédé d'agrandissement variable d'un système optique à puissance variable Download PDFInfo
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- WO2008010563A1 WO2008010563A1 PCT/JP2007/064300 JP2007064300W WO2008010563A1 WO 2008010563 A1 WO2008010563 A1 WO 2008010563A1 JP 2007064300 W JP2007064300 W JP 2007064300W WO 2008010563 A1 WO2008010563 A1 WO 2008010563A1
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- lens group
- lens
- optical system
- end state
- variable magnification
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Classifications
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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
- G02B15/144—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 four groups only
- G02B15/1445—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 four groups only the first group being negative
- G02B15/144511—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 four groups only the first group being negative arranged -+-+
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/04—Reversed telephoto objectives
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- 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
-
- 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
- G02B15/16—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—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 with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
Definitions
- variable magnification optical system imaging device, variable magnification optical system magnification method
- the present invention relates to a variable magnification optical system, an imaging apparatus, and a variable magnification optical system variable magnification method.
- variable magnification optical system suitable for a photographic camera, an electronic still camera, a video camera, and the like has been proposed (see, for example, JP-A-2004-61910 and JP-A-11-174329).
- variable magnification optical system has a problem that it cannot fully satisfy the demand for high magnification because the magnification ratio is about 2 times.
- the aperture stop is not optimally arranged, there is a problem that good optical performance is not achieved.
- the present invention has been made in view of the above-described problems, and provides a variable magnification optical system, an imaging apparatus, and a variable magnification method for the variable magnification optical system that have a high variable magnification ratio and good optical performance.
- the purpose is to provide.
- the lens groups move so that the distance between the lens group and the third lens group changes, and the distance between the third lens group and the fourth lens group changes.
- a variable magnification optical system characterized by moving together with the third lens group and further satisfying the following conditional expressions (1) and (2) is provided.
- an imaging apparatus comprising the variable magnification optical system according to the first aspect of the present invention.
- Each lens group is moved so that the distance between the second lens group and the third lens group is changed at the time of magnification, and the distance between the third lens group and the fourth lens group is changed,
- the aperture stop moves together with the third lens group, and the second lens group, the third lens group, and the fourth lens group each have at least one cemented lens, and the fourth lens group
- the cemented lens in the middle consists of a positive lens and a negative lens in order from the object side.
- cl 1 w Distance on the optical axis from the lens surface closest to the object side to the image plane in the variable magnification optical system in the wide-angle end state
- a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power And a fourth lens group having a positive refractive power and when zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group changes, and The distance between the third lens group and the fourth lens group changes, and the whole or a part of the third lens group is shifted in the direction orthogonal to the optical axis as an anti-vibration lens group, and the following conditional expression (5)
- r 1 radius of curvature of the image stabilizing lens group on the object side
- r 2 radius of curvature of the image stabilizing side of the image stabilizing lens group
- an imaging apparatus comprising the variable magnification optical system according to the fourth aspect of the present invention.
- a zooming method for a variable power optical system having an aperture stop between the second lens group and the fourth lens group, and a wide-angle end state
- the distance between the second lens group and the third lens group changes, and the distance between the third lens group and the fourth lens group changes.
- Each of the lens groups moves, and the aperture stop moves with the third lens group, and further satisfies the following conditional expressions (1) and (2): Provide a double method.
- a seventh aspect of the present invention in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens having a negative refractive power And a fourth lens group having a positive refracting power, a zooming method for a variable power optical system having an aperture stop between the second lens group and the fourth lens group, and a wide-angle end state
- a zooming method for a variable power optical system having an aperture stop between the second lens group and the fourth lens group, and a wide-angle end state
- each of the second lens group, the third lens group, and the fourth lens group has at least one cemented lens.
- the cemented lenses in the fourth lens group are positive in order from the object side.
- the lens surface closest to the image plane in the variable magnification optical system is convex toward the image plane side, and further satisfies the following conditional expression (3): A zooming method for a zooming optical system is provided.
- Yin ax Maximum image height
- a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power
- the zooming method of the zooming optical system having the fourth lens unit having a positive refractive power when zooming from the wide-angle end state to the telephoto end state, the second lens unit and the third lens The distance between the third lens group and the fourth lens group changes, and the whole or a part of the third lens group is shifted in the direction orthogonal to the optical axis.
- the present invention provides a zooming method for a zooming optical system characterized by satisfying the following conditional expression (5).
- r 1 radius of curvature on the object side of the anti-vibration lens group
- r 2 radius of curvature of the image stabilizing side of the image stabilizing lens group
- variable power optical system having an anti-vibration function that corrects blurring of a photographed image due to vibration and hand blur while having a high zoom ratio and good optical performance, an imaging device, and A zooming method for a zooming optical system can be provided.
- FIG. 1 is a lens cross-sectional view in the wide-angle end state showing a configuration of a variable magnification optical system according to the first example of the first embodiment.
- 2A and 2B are diagrams showing various aberrations when focusing at infinity in the wide-angle end state of the variable magnification optical system according to the first example, and blur correction for rotation blur of 0.734 °, respectively. It is a meridional transverse aberration diagram at the time of contact.
- FIG. 3 is a diagram of various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the first example.
- 4A and 4B are diagrams showing various aberrations during focusing at infinity in the telephoto end state of the variable magnification optical system according to Example 1, and blur correction for rotational blurring of 0.432 °, respectively. It is a meridional transverse aberration diagram at the time of contact.
- FIG. 5 is a lens cross-sectional view in the wide-angle end state showing the configuration of the variable magnification optical system according to the second example of the first embodiment.
- Figures 6 and 6 respectively show various aberration diagrams during focusing at infinity in the wide-angle end state of the variable magnification optical system according to the second example, and shake correction for rotational blurring of 0.734 °. It is a meridional transverse aberration diagram at the time of contact.
- FIG. 7 is a diagram of various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the second example.
- Figures 8 and 8 show aberration diagrams for focusing at infinity in the telephoto end state of the variable magnification optical system according to the second example, and blur correction for rotational blurring of 0.432 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when performed.
- FIG. 9 is a lens cross-sectional view in the wide-angle end state showing the configuration of the variable magnification optical system according to the third example of the first embodiment.
- FIGS. 10A and 10B are diagrams showing various aberrations when focusing at infinity in the wide-angle end state of the variable magnification optical system according to the third example, and blur correction was performed for rotation blur of 0.734 °, respectively. It is a meridional transverse aberration diagram at the time.
- FIG. 11 is a diagram of various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the third example.
- 12A and 12B are diagrams showing various aberrations when focusing at infinity in the telephoto end state of the variable magnification optical system according to the third example, and blur correction was performed for rotational blurring of 0.432 °, respectively. It is a meridional transverse aberration diagram at the time.
- FIG. 13 is a lens cross-sectional view in the wide-angle end state showing a configuration of a variable magnification optical system according to the fourth example of the first embodiment.
- FIGS. 14A and 14B are diagrams showing various aberrations when focusing at infinity in the wide-angle end state of the variable magnification optical system according to the fourth example, and blur correction was performed for rotational blur of 0.734 °, respectively. It is a meridional transverse aberration diagram at the time.
- FIG. 15 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 example.
- FIGS. 16A and 16B are diagrams showing various aberrations at the time of focusing on infinity in the telephoto end state of the variable magnification optical system according to Example 4, and rotational blurring of 0.4 3 2 °, respectively.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 17 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the fifth example of the second embodiment.
- Figures 18A and 18B are diagrams showing various aberrations in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the fifth example when focused at infinity, and when image blur correction was performed.
- the meridional transverse aberration diagram is shown.
- FIG. 19 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fifth example.
- FIGS. 20A and 20B are diagrams showing various aberrations in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fifth example, and when image blur correction is performed.
- Figure 2 shows the lateral transverse aberration diagram.
- FIG. 21 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the sixth example of the second embodiment.
- Figures 2 2 and 2 2 are diagrams showing various aberrations in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the sixth example when focused at infinity, and when image blur correction was performed.
- the meridional transverse aberration diagram is shown.
- FIG. 23 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the sixth example.
- Figures 2-4 and 2-4 are diagrams showing various aberrations at the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to Example 6 and image blur correction. Shows the meridional transverse aberration diagram.
- FIG. 25 shows a wide range of the variable magnification optical system having the image stabilization function according to the seventh example of the second embodiment. It is sectional drawing which shows the lens structure in a corner end state.
- Figures 26 and 26 show the various aberration diagrams at the wide-angle end state when focusing on infinity of the variable magnification optical system having the image stabilization function according to the seventh example, and when image blur correction was performed.
- the meridional transverse aberration diagram is shown.
- FIG. 27 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the seventh example.
- Figures 28 and 28 are diagrams showing various aberrations at the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to Example 7 and image blur correction. Shows the meridional transverse aberration diagram.
- FIG. 29 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to Example 8 of Embodiment 2.
- Figures' 3 0 ⁇ and 3 0 ⁇ ⁇ ⁇ ⁇ show various aberration diagrams at the wide-angle end state when focusing on infinity of the variable magnification optical system having the image stabilization function according to Example 8 and image blur correction, respectively.
- the meridional transverse aberration diagram is shown.
- FIG. 31 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the eighth example.
- Figures 3 2 and 3 2 are graphs showing various aberrations in the telephoto end state at the time of focusing on infinity and image blur correction of the variable magnification optical system having the image stabilization function according to Example 8. Shows the meridional transverse aberration diagram.
- FIG. 33 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to Example 9 of Embodiment 2.
- Figures 3-4 and 3-4 are diagrams showing various aberrations in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the ninth example when focused at infinity, and when image blur correction was performed.
- the meridional transverse aberration diagram is shown.
- FIG. 35 is a diagram of various aberrations in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to Example 9.
- FIG. ' Figures 36A and 36B are diagrams showing various aberrations at the telephoto end state at the time of focusing on infinity and image blur correction of the variable magnification optical system having the image stabilization function according to the ninth example. Shows the meridional transverse aberration diagram. '
- FIG. 37 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to Example 10 of the third embodiment.
- Figures 3 8 A and 3 8 B show aberration diagrams of the variable magnification optical system having the image stabilization function according to Example 10 in the wide-angle end state when focused at infinity, and Figure 3 8 A shows image blur correction.
- Fig. 38B shows the meridional lateral aberration when image blur correction is performed.
- FIG. 39 is a diagram of various aberrations in the intermediate focal length state when the variable magnification optical system having the image stabilization function according to Example 10 is in focus at infinity.
- FIGS. 40A and 40B show aberration diagrams in the telephoto end state at the time of infinity of the variable magnification optical system having the image stabilization function according to Example 10.
- FIG. 4 OA shows image blur correction.
- Figure 40B shows the meridional lateral aberration when image blur correction is performed.
- FIG. 41 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the first example of the third embodiment.
- Fig. 4 2 A and 4 2 B show aberration diagrams of the variable magnification optical system having the image stabilization function according to Example 1 in the wide-angle end state when focused at infinity, and Fig. 4 2 A shows image blur correction. Fig. 4 2B shows the meridional transverse aberration when image blur correction is performed.
- FIG. 43 is a diagram illustrating various aberrations in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example.
- FIG. 4A and 4B show aberration diagrams of the variable magnification optical system having the image stabilization function according to Example 1 in the telephoto end state when focused at infinity, and FIG. 4 4A shows image blur correction.
- Fig. 4 4B shows the various aberrations when image blurring is not performed. Null aberration is shown.
- FIG. 45 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the first to second examples of the third embodiment.
- Figures 4-6 and 4-6 indicate aberration diagrams of the variable magnification optical system having the image stabilization function according to Example 1 in the wide-angle end state when focused at infinity, and Figure 4-6 indicates image blur correction.
- Fig. 46B shows the meridional lateral aberration when image blur correction is performed.
- FIG. 47 is a diagram of various aberrations in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having a torsion prevention function according to the first and second examples.
- FIG. 4A and 4B show aberration diagrams in the telephoto end state of the variable magnification optical system having the image stabilization function according to Example 1 2 at the time of focusing on infinity, and FIG. 4 8A shows image blur correction.
- Figure 48B shows the meridional lateral aberration when image blur correction is performed.
- FIG. 49 is a schematic configuration diagram of an image pickup apparatus (camera) including a variable magnification optical system having a vibration isolation function according to the first example of the first embodiment.
- BEST MODE FOR CARRYING OUT THE INVENTION is a schematic configuration diagram of an image pickup apparatus (camera) including a variable magnification optical system having a vibration isolation function according to the first example of the first embodiment.
- variable power optical system an imaging apparatus, and a variable power method of the variable power optical system according to the first embodiment of the present application will be described.
- the variable magnification optical system includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a negative refractive power, and a positive A fourth lens group having a refractive power, an aperture stop between the second lens group and the fourth lens group, and in the zooming from the wide-angle end state to the telephoto end state,
- the lens groups are moved so that the distance between the lens group and the third lens group is increased, and the distance between the third lens group and the fourth lens group is decreased. It moves with the third lens group, and further satisfies the following conditional expressions (1) and (2).
- the zoom optical system corrects the image plane when an image blur occurs by shifting the entire third lens group in a direction orthogonal to the optical axis.
- Conditional expression (1) defines an appropriate range of the refractive power of the second lens group.
- conditional expression (1) If the lower limit of conditional expression (1) is not reached, the refractive power of the second lens group becomes too large, and coma becomes worse. In addition, the decentration aberration during vibration isolation, that is, coma aberration or astigmatism is deteriorated.
- conditional expression (1) In order to secure the effect of the present invention, it is desirable to set the lower limit value of conditional expression (1) to 1.30.
- conditional expression (1) In order to secure the effect of the present invention, it is desirable to set the upper limit value of conditional expression (1) to 1.80.
- Conditional expression (2) defines the refractive power of the third lens group.
- the present zoom optical system effectively secures a predetermined zoom ratio, Good optical performance, particularly good optical performance can be achieved even during image stabilization. If the lower limit of conditional expression (2) is not reached, the refractive power of the third lens unit becomes too small, and the amount of movement of the third lens unit during zooming increases. For this reason, the variation in curvature of field at the time of zooming becomes large, and it becomes difficult to correct this.
- conditional expression (2) If the upper limit of conditional expression (2) is exceeded, the refractive power of the third lens group will become too large and the spherical aberration will deteriorate. In addition, the decentration aberration during vibration isolation, that is, coma aberration or astigmatism is deteriorated.
- conditional expression (2) In order to secure the effect of the present invention, it is desirable to set the upper limit value of conditional expression (2) to ⁇ 1.50. In order to further secure the effect of the present invention, it is desirable to set the lower limit value of conditional expression (2) to 12.0.
- the aperture stop is disposed between the second lens group and the fourth lens group, and when zooming from the wide angle end state to the telephoto end state, Move with.
- the third lens group has a cemented lens.
- the fourth lens group is composed of a cemented lens composed of a negative lens and a positive lens, and a single lens having a positive refractive power, in order from the most image side. It is desirable.
- each of the second lens group, the third lens group, and the fourth lens group has at least one cemented lens.
- the zoom lens unit moves to the object side after moving to the image plane side when zooming from the wide-angle end state to the telephoto end state.
- the variable magnification optical system satisfies the following conditional expression (3).
- Conditional expression (3) defines the moving condition of the first lens unit upon zooming from the wide-angle end state to the telephoto end state.
- conditional expression (3) it is desirable to set the lower limit value of conditional expression (3) to ⁇ 0.15.
- conditional expression (3) it is desirable to set the upper limit value of conditional expression (3) to 0.05.
- variable magnification optical system it is desirable that the lens surface closest to the image plane in the variable magnification optical system is convex toward the image plane side.
- the variable magnification optical system includes, in order from the object side, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power, A fourth lens group having a positive refractive power, an aperture stop between the second lens group and the fourth lens group, and in zooming from the wide-angle end state to the telephoto end state,
- the first lens group moves to the object side after moving to the image plane side, the distance between the second lens group and the third lens group increases, and the third lens group and the fourth lens group
- the aperture stop moves together with the third lens group, the second lens group, the third lens group, and the fourth lens.
- Each lens group has at least one cemented lens, and the cemented lens in the fourth lens group Is composed of a positive lens and a negative lens in order from the object side, and the lens surface closest to the image plane in the zoom optical system is convex toward the image plane, and the following conditional expression ( 3) is satisfied.
- cM t Distance on the optical axis from the lens surface closest to the object side to the image plane in the variable magnification optical system in the telephoto end state
- the aperture stop moves together with the third lens group when zooming from the wide-angle end state to the telephoto end state.
- each of the second lens group, the third lens group, and the fourth lens group has at least one cemented lens. 10 With this configuration, it is possible to satisfactorily correct the variation in lateral chromatic aberration during zooming.
- the fourth lens group includes a cemented lens including a negative lens and a positive lens in order from the most image side, and a single lens having a positive refractive power. It is configured. With this configuration, it is possible to satisfactorily correct lateral chromatic aberration, spherical aberration, and coma aberration while securing the distances if,, between the third lens group and the fourth lens group.
- the third lens group as an anti-vibration lens group, coma or astigmatism during image stabilization can be corrected well.
- the present variable magnification optical system has a convex shape toward the image surface side of the lens surface force closest to the image surface in the variable magnification optical system. With this configuration, it is possible to reduce 0 ghost wrinkles due to reflected light from the image plane.
- conditional expression (3) is the same as that described above, its description is omitted.
- variable magnification optical system satisfies the following conditional expression (4).
- f 2 Focal length of the second lens group
- f 3 Focal length of the third lens group
- Conditional expression (4) appropriately defines the refractive power of the second lens group and the refractive power of the third lens group.
- the present variable magnification optical system can realize good optical performance by satisfying the conditional expression (4).
- conditional expression (4) If the lower limit value of conditional expression (4) is not reached, the refractive power of the second lens group becomes too large, so that coma during zooming cannot be corrected well.
- conditional expression (4) it is desirable to set the lower limit value of conditional expression (4) to 0.75.
- conditional expression (4) it is desirable to set the upper limit value of conditional expression (4) to 1.1.
- the main image apparatus includes the variable magnification optical system having the above-described configuration.
- an imaging device having a high zoom ratio and good optical performance can be realized.
- the variable magnification method of the variable magnification optical system includes, in order from the object side, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power. And a fourth lens group having a positive refractive power, a zooming method of the variable power optical system having an aperture stop between the second lens group and the fourth lens group, and a wide-angle end state
- zooming from the telephoto end state to the telephoto end state the distance between the second lens group and the third lens group is increased, and the distance between the third lens group and the fourth lens group is decreased.
- Each lens group moves, and the aperture stop moves together with the third lens group, and further satisfies the following conditional expressions (1) and (2).
- the zooming method of the zoom optical system includes, in order from the object side, a first lens group having negative refractive power; a second lens group having positive refractive power; and a third lens group having negative refractive power And a fourth lens group having a positive refractive power, a zooming method of the variable power optical system having an aperture stop between the second lens group and the fourth lens group, and a wide-angle end state
- the first lens group moves to the object side once after moving to the image plane side, and the distance between the second lens group and the third lens group increases.
- the lens groups move so that the distance between the third lens group and the fourth lens group decreases, and the aperture stop moves with the third lens group, and the second lens group,
- Each of the third lens group and the fourth lens group has at least one cemented lens
- the cemented lens in the fourth lens group is composed of a positive lens and a negative lens in order from the object side, and the lens surface closest to the image plane in the variable magnification optical system is convex toward the image plane side. Further, the following conditional expression (3) is satisfied.
- variable magnification optical system according to each numerical example of the first embodiment will be described below with reference to the accompanying drawings.
- FIG. 1 is a lens cross-sectional view in the wide-angle end state showing a configuration of a variable magnification optical system according to the first example of the first embodiment.
- variable magnification optical system includes, in order from the object side, a first lens group G 1 having a negative refractive power, a second lens group G 2 having a positive refractive power, and a negative refractive power.
- the third lens group G 3 has a fourth lens group G 4 having a positive refractive power.
- the first lens group G 1 includes, in order from the object side, a negative meniscus lens L 11 having a convex surface facing the object side, a negative meniscus lens L 12 having a convex surface facing the object side, and a positive surface having a convex surface facing the object side. It consists of a cemented lens with a meniscus lens L 1 3.
- the negative meniscus / cass lens 11 is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the glass lens surface on the image side.
- the second lens group G 2 includes, in order from the object side, a biconvex positive lens L 2 1 and a cemented lens of a biconvex positive lens L 2 2 and a biconcave negative lens L 2 3.
- the third lens group G 3 includes, in order from the object side, a cemented lens of a positive meniscus lens L 3 1 having a concave surface facing the object side and a biconcave negative lens L 3 2.
- the fourth lens unit G4 consists of a positive meniscus lens L 4 1 with a concave surface facing the object side, a biconvex positive lens L 4 2 and a negative meniscus lens L 4 with a convex surface facing the image side. 3 and a cemented lens.
- the zoom optical system when zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group G2 and the third lens group G3 is increased.
- the first lens group G 1 moves to the object side after moving to the image side so that the distance between the lens group G 3 and the fourth lens group G 4 decreases, and the second lens group G 2,
- the third lens group G 3 and the fourth lens group G 4 move to the object side.
- the aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 upon zooming from the wide-angle end state to the telephoto end state. .
- variable magnification optical system the entire third lens group G3 is shifted in a direction perpendicular to the optical axis to correct the image plane when an image blur occurs.
- Table 1 below lists the values of the specifications of the variable magnification optical system according to the first example.
- f is the focal length
- FNO is the F number
- W is the wide-angle end state
- M is the intermediate focal length state
- T is the telephoto end state.
- the first column N is the order of the lens surfaces counted from the object side
- the second column r is the radius of curvature of the lens surfaces
- the third column d is the distance between the lens surfaces
- R 0.000 represents a plane
- Bf represents back focus
- [Aspherical data] shows the aspherical coefficient when the shape of the aspherical surface is expressed by the following equation.
- x (h 2 / r) / [1 + ⁇ 1 - ⁇ (h / r) 2 ⁇ 1/2 ]
- x is the displacement in the optical axis direction at the height h from the optical axis when the apex of the aspherical surface is the reference (sag amount)
- ⁇ is the conic constant
- C4, C6, C8, C10 are non
- the spherical coefficient r is the radius of curvature of the reference sphere (paraxial radius of curvature).
- ⁇ -nj indicates “XI 0— ⁇ ”, for example, ⁇ 1.234E-05J is “1.234X10 1 5 ”.
- the focal length f and the variable interval between the lens groups are shown.
- the focal length f, the radius of curvature r, and other length units listed in all the specification values in the following examples are generally “mm”.
- the optical system can obtain the same optical performance even when proportionally enlarged or proportionally reduced, so the unit is limited to “mm”. It is not something that can be done. Note that the same reference numerals as in the present embodiment are used in the specification values of the following embodiments.
- the lens where the focal length of the entire lens system is f, and the ratio of the image movement amount on the image plane I to the movement amount of the image stabilizing lens group at the time of blurring correction, that is, the lens whose image stabilization coefficient is K In order to correct the rotational blur of the lens, it is only necessary to move the anti-vibration lens group by (f ⁇ tan ⁇ ) ZK in a direction perpendicular to the optical axis. Since the anti-vibration coefficient is 1.321 and the focal length is 18.5 (mm) in the end state, the amount of movement of the third lens group G3 to correct the rotational blur of 0.734 ° is ⁇ . 1 79 In the telephoto end state, the anti-vibration coefficient is 2.2 and the focal length is 53.4 (mm), so the third lens is used to correct rotation blur of 0.432 °. The movement of group G3 is 0.183 (mm).
- 2A and 2B are diagrams showing various aberrations at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the first example, and when blur correction is performed for rotational blurring of 0.734 °, respectively. It is a meridional transverse aberration diagram.
- FIG. 3 is a diagram of various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the first example.
- FIG. 4A and 4B are diagrams showing various aberrations during focusing at infinity in the telephoto end state of the variable magnification optical system according to the first example, and blur correction for rotational blurring of 0.432 °.
- FIG. 4A and 4B are diagrams showing various aberrations during focusing at infinity in the telephoto end state of the variable magnification optical system according to the first example, and blur correction for rotational blurring of 0.432 °.
- F NO is the F picker and Y is the image height.
- the spherical aberration diagram shows the F-number value corresponding to the maximum aperture
- the astigmatism diagram and the distortion graph show the maximum field angle
- the coma diagram shows the value of each field angle.
- the solid line shows the sagittal image plane
- the broken line shows the meridional image plane.
- variable magnification optical system corrects various aberrations well from the wide-angle end state to the telephoto end state and has excellent imaging performance.
- FIG. 5 is a lens cross-sectional view in the wide-angle end state showing the configuration of the variable magnification optical system according to the second example of the first embodiment.
- the variable magnification optical system according to this example includes, in order from the object side, a first lens group G 1 having a negative refractive power, a second lens group G 2 having a positive refractive power, and a negative refractive power.
- the third lens group G 3 has a fourth lens group G 4 having a positive refractive power.
- the first lens group G1 consists of a negative meniscus lens L 1 1 with a convex surface facing the object side, a biconcave negative lens L 1 2 and a positive meniscus lens L with a convex surface facing the object side. It consists of 1 and 3.
- the negative meniscus lens L I 1 is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the image-side glass lens surface.
- the second lens group G 2 includes, in order from the object side, a cemented lens of a negative meniscus lens L 2 1 having a convex surface facing the object side and a biconvex positive lens L 2 2, and a biconvex positive lens L 2. It consists of three.
- the third lens group G 3 includes, in order from the object side, a cemented lens of a positive meniscus lens L 3 1 having a concave surface facing the object side and a biconcave negative lens L 3 2.
- the fourth lens group G4 consists of a negative meniscus lens L 4 1 with a concave surface facing the object side, a biconvex positive lens L 4 2 and a negative meniscus lens L 4 with a convex surface facing the image side. 3 and a cemented lens.
- the zoom optical system according to the present embodiment having such a configuration, when zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group G2 and the third lens group G3 is increased.
- the first lens group G 1 once moves to the image plane side and then moves to the object side so that the distance between the third lens group G 3 and the fourth lens group G 4 decreases.
- the third lens group G 3 and the fourth lens group G 4 move to the object side.
- the aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 upon zooming from the wide-angle end state to the telephoto end state. .
- variable magnification optical system the entire third lens group G3 is shifted in a direction perpendicular to the optical axis, thereby correcting the image plane when an image blur occurs.
- Table 2 below provides values of specifications of the variable magnification optical system according to the second example.
- the variable magnification optical system according to the present example corrects rotational blur of 0.734 ° because the image stabilization coefficient is 1.162 and the focal length is 18.5 (mm) in the wide-angle end state. Therefore, the moving amount of the third lens group G3 is 0.204 (mm). In the telephoto end state, the anti-vibration coefficient is 1.914 and the focal length is 53.6 (mm), so the amount of movement of the third lens group G3 to correct rotation blur of 0.432 ° is 0. 21 1 (mm).
- FIG. 6A and 6B are diagrams showing various aberrations when focusing on infinity in the wide-angle end state of the variable magnification optical system according to the second example, and for rotational blurring of 0.734 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when the measurement is performed.
- FIG. 7 is a diagram of various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the second example.
- FIGS. 8A and 8B are diagrams showing various aberrations when focusing at infinity in the telephoto end state of the variable magnification optical system according to the second example, and for blurring correction for rotational blurring of 0.4 3 2 °, respectively.
- FIG. 6 is a meridional transverse aberration diagram when the measurement is performed.
- variable magnification optical system corrects various aberrations well from the wide-angle end state to the telephoto end state and has excellent imaging performance.
- FIG. 9 is a lens sectional view in the wide-angle end state showing the configuration of the variable magnification optical system according to the third example of the first embodiment.
- variable magnification optical system includes, in order from the object side, a first lens group G 1 having a negative refractive power, a second lens group G 2 having a positive refractive power, and a negative refractive power.
- the third lens group G 3 has a fourth lens group G 4 having a positive refractive power.
- the first lens group G1 consists of a negative meniscus lens L 1 1 with a convex surface facing the object side, a biconcave negative lens L 1 2 and a positive meniscus lens L with a convex surface facing the object side. It consists of 1 and 3.
- the negative meniscus lens L 11 is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the image-side glass lens surface.
- the second lens group G 2 includes, in order from the object side, a cemented lens of a negative meniscus lens L 2 1 having a convex surface facing the object side and a biconvex positive lens L 2 2, and a biconvex positive lens L 2. It consists of three.
- the third lens group G 3 includes, in order from the object side, a cemented lens of a biconcave negative lens L 3 1 and a positive meniscus lens L 3 2 having a convex surface facing the object side.
- the fourth lens group G4 consists of a positive meniscus lens L 4 1 with a concave surface facing the object side, a biconvex positive lens L 4 2 and a negative meniscus lens L 4 with a convex surface facing the image side. 3 and a cemented lens.
- the zoom optical system according to the present embodiment having such a configuration, when zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group G2 and the third lens group G3 is increased.
- the first lens group G 1 once moves to the image plane side and then moves to the object side so that the distance between the lens group G 3 and the fourth lens group G 4 decreases.
- the third lens group G 3 and the fourth lens group G 4 move to the object side.
- the aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 upon zooming from the wide-angle end state to the telephoto end state. .
- variable magnification optical system the entire third lens group G3 is shifted in a direction perpendicular to the optical axis to perform image plane correction when image blur occurs.
- Table 3 lists the values of the specifications of the variable magnification optical system according to the third example.
- the zoom optical system according to the present example has a vibration isolation coefficient of 1.1 6 2 and a focal length of 18.5 (mm) in the wide-angle end state, the rotation is 0.7 3 4 °.
- the amount of movement of the third lens group G 3 for correcting blur is 0.204 (mm).
- the anti-vibration coefficient is 2.0 3 7 and the focal length is 5 3.6 (mm), so the third lens group is used to correct rotation blur of 0.4 3 2 °.
- G 3 travel is 0.
- FIGS. 10A and 10B are graphs 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 third example, and 0.7.
- FIG. 6 is a meridional lateral aberration diagram when blur correction is performed.
- FIG. 11 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 example.
- Figures 12A and 12B are graphs showing various aberrations when focusing at infinity in the telephoto end state of the variable magnification optical system according to the third example.
- FIG. 6 is a meridional transverse aberration diagram when correction is performed.
- FIG. 13 is a lens cross-sectional view in the wide-angle end state showing a configuration of a variable magnification optical system according to the fourth example of the first embodiment.
- variable magnification optical system includes, in order from the object side, a first lens group G 1 having a negative refractive power, a second lens group G 2 having a positive refractive power, and a negative refractive power.
- the third lens group G 3 has a fourth lens group G 4 having a positive refractive power.
- the first lens group G1 consists of a negative meniscus lens L 1 1 with a convex surface facing the object side, a biconcave negative lens L 1 2 and a positive meniscus lens L with a convex surface facing the object side. It consists of 1 and 3.
- the negative meniscus lens L 11 is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the glass lens surface on the image side.
- the second lens group G2 consists of, in order from the object side, a cemented lens of a negative meniscus lens L2 1 with a convex surface facing the object side and a biconvex positive lens L22, and a biconvex positive lens L. It consists of 2 and 3.
- the third lens group G3 includes, in order from the object side, a cemented lens of a positive meniscus lens L3 1 with a concave surface facing the object side and a negative lens L3 2 with a biconcave shape, and a positive surface with a concave surface facing the image side.
- the fourth lens group G4 consists of a positive meniscus lens L 4 1 with a concave surface facing the object side, a biconvex positive lens L 4 2 and a negative meniscus lens L with the heel surface facing the image side. 4 It consists of a cemented lens with 3.
- the zoom optical system according to the present embodiment having such a configuration, when zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group G2 and the third lens group G3 is increased.
- the first lens group G 1 once moves to the image plane side and then moves to the object side so that the distance between the lens group G 3 and the fourth lens group G 4 decreases.
- the third lens group G 3 and the fourth lens group G 4 move to the object side.
- the aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 upon zooming from the wide-angle end state to the telephoto end state. .
- the entire third lens group G3 is shifted in a direction perpendicular to the optical axis to perform image plane correction when image blur occurs.
- Table 4 lists the values of the specifications of the variable magnification optical system according to the fourth example.
- variable magnification optical system has a vibration isolation coefficient of 1.3 3 5 and a focal length of 18.5 (mm) in the wide-angle end state.
- the amount of movement of the third lens group G3 is 0.179 (mm).
- the anti-vibration coefficient is 2.128 and the focal length is 53.6 (mm), so the third lens group G3 is moved to correct rotational blur of 0.432 °.
- the amount is 0.1 90 (mm).
- FIGS. 14A and 14B are graphs showing various aberrations during focusing at infinity in the wide-angle end state of the variable magnification optical system according to Example 4, and blur correction for rotational blurring of 0.734 °. It is a meridional transverse aberration diagram when it is performed.
- FIG. 15 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 example.
- FIGS. 16A and 16B are diagrams showing various aberrations at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to Example 4, and blur correction for rotational blurring of 0.432 °.
- FIG. 6 is a meridional transverse aberration diagram when performed.
- variable magnification optical system corrects various aberrations well from the wide-angle end state to the telephoto end state and has excellent imaging performance.
- variable magnification optical system having an image stabilization function according to the second embodiment of the present application will be described.
- the variable magnification optical system having the image stabilization function includes, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power.
- the lens group and the fourth lens group having a positive refractive power, and when zooming from the wide-angle end state to the telephoto end state, the distance between the second lens group and the third lens group increases.
- the distance between the third lens group and the fourth lens group is decreased, and the entire or a part of the third lens group is moved as a vibration-proof lens group in a direction perpendicular to the optical axis, so that the variable magnification optical system vibrates.
- the image blur is corrected and the following conditional expressions (5) and (6) are satisfied. (5) 0.12 ⁇ (r 2+ rl) / (r 2- r 1) ⁇ 1.30
- r 1 radius of curvature on the object side of the anti-vibration lens group
- ⁇ 2 radius of curvature of the image stabilizing lens group on the image plane side
- Conditional expression (5) defines the shape of the anti-vibration lens group, which effectively secures the predetermined high zoom ratio and ensures good optical performance while maintaining anti-vibration. Sometimes good optical performance is achieved.
- conditional expression (5) If the lower limit of conditional expression (5) is not reached, the fluctuation of decentration coma aberration will increase, and the anti-vibration effect will be reduced, or the power will be weak, and a high zoom ratio cannot be secured. If the upper limit of conditional expression (5) is exceeded, it will be difficult to correct spherical aberration during zooming.
- conditional expression (5) In order to secure the effect of the present invention, it is desirable to set the lower limit value of conditional expression (5) to 0.25. In order to ensure the effect of the present invention, it is desirable to set the upper limit value of conditional expression (5) to 1.00. In order to further secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (5) to 0.36.
- Conditional expression (6) defines the focal length of the anti-vibration lens group with respect to the focal length of the entire variable magnification optical system in the wide-angle end state. Realized.
- conditional expression (6) If the lower limit of conditional expression (6) is not reached, the variation in field curvature due to decentration becomes too large. On the other hand, if the value exceeds the upper limit, the power of the anti-vibration lens group becomes too weak and the anti-vibration effect is reduced. As a result, the power of the first lens group becomes strong and spherical aberration occurs, which is not preferable.
- conditional expression (6) In order to secure the effect of the present invention, it is desirable to set the lower limit of conditional expression (6) to 1.60. In order to ensure the effect of the present invention, the conditional expression (6) It is desirable to set the upper upper limit value of to 33 .. 00 00. .
- variable magnification optical system that has the functions of the present anti-vibration and vibration isolator satisfies the following conditional expression ((77)): This is what you want to add. .
- conditional condition formula ((77)) expresses the focal point distance of the anti-vibration anti-vibration Renrens group as opposed to the focal point distance of the twenty-second Renrens group. This means that the optical and optical performance performance is good and good at the time of anti-vibration and vibration prevention. I'm going. .
- the telephoto end end state remains unchanged from the wide-angle end state.
- the decentration decentration aberration difference ((comacoma aberration difference, image field plane curve curvature aberration difference)) cannot be compensated positively. Naruru. .
- the power of the anti-vibration anti-vibration Renrenz group will become weak and weak, and the anti-vibration anti-vibration effect will be obtained. I can't get lost. .
- the eleventh lens of the 11th Renrens group became stronger, and the spherical surface aberration difference was generated and remained unfavorable. No. .
- the lower and lower limit values of the conditional expression ((77)) must be set. 11 .. 11 00 1155 This is what you want. .
- the upper and lower limit values of the conditional expression ((77)) must be set. 22 .. This is what I want to do at 00 00. .
- variable magnification optical system that has the functions of the present anti-vibration and vibration isolator has a negative and negative yield in order from the object side.
- the 33rd Renrenz group with power and the 44th Renrenz group with positive flexural refracting power When performing 2200 variable magnification with the telephoto end in the end state, the 22nd Renrens group and the 33rd Renrenz group The distance between the 33rd Renrenz group and the 44th Renrenz group decreased and decreased, and the entire 33rd Renrens group The whole body More specifically, a part of the anti-vibration and vibration-proofing Renrenz group group is moved and moved in the direction perpendicular to the optical axis axis. Then, the image blurring at the time when the variable magnification optical system is vibrated is corrected and corrected. This is a composition that satisfies the formulas ((55)), ((77)). .
- r 1 radius of curvature on the object side of the anti-vibration lens group
- r 2 radius of curvature of the image stabilizing side of the image stabilizing lens group
- Conditional expression (5) defines the shape of the anti-vibration lens group, but since it has already been described above, redundant description is omitted.
- Conditional expression (7) defines the focal length of the anti-vibration lens unit relative to the focal length of the second lens unit, and this achieves good optical performance during anti-vibration. If the lower limit of conditional expression (7) is not reached, decentration aberrations (coma aberration and field curvature aberration) cannot be corrected during zooming from the wide-angle end state to the telephoto end state. If the value exceeds the upper limit, the power of the anti-vibration lens group becomes weak and the anti-vibration effect cannot be obtained. As a result, the power of the first lens group becomes strong, and spherical aberration occurs, which is not preferable.
- the first lens unit moves along a convex locus toward the image plane when zooming from the wide-angle end state to the telephoto end state.
- a high zoom ratio can be achieved, and the amount of movement of each lens group can be reduced.
- variable magnification optical system having the image stabilization function it is desirable that the lens surface closest to the image surface is convex toward the image surface. With this configuration, the curvature of field can be corrected satisfactorily, and ghosts caused by reflected light from the image plane can be reduced.
- the fourth lens group includes a negative lens, a positive lens, and a positive lens in order from the image side.
- the third lens group has a cemented lens. It is desirable. By adopting such a configuration, it is possible to maintain good lateral chromatic aberration during image stabilization.
- variable magnification optical system having the image stabilization function
- the second lens group, the third lens group, and the fourth lens group each have a cemented lens.
- variable magnification optical system having the anti-vibration function it is desirable that the second lens unit and the fourth lens unit move as a body during zooming from the wide-angle end state to the telephoto end state. .
- the aperture stop is arranged in the vicinity of the third lens group and performs zooming from the wide-angle end state to the telephoto end state. It is preferable to move to the body.
- the vicinity of the third lens group means a range including between the second lens group and the third lens group, within the third lens group, and between the third lens group and the fourth lens group.
- the aperture stop is disposed in the vicinity of the second lens group, and is integrated with the second lens group when zooming from the wide-angle end state to the telephoto end state. It is preferable to move to.
- the vicinity of the second lens group means a range including between the first lens group and the second lens group, in the second lens group, and between the second lens group and the third lens group.
- variable magnification optical system having the anti-vibration function it is desirable to dispose a fixed diaphragm between the third lens group and the fourth lens group. By adopting such a configuration, it is possible to cut the frame and maintain good optical performance.
- FIG. 17 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the fifth example of the second embodiment.
- variable magnification optical system having the image stabilization function according to the fifth example includes, in order from the object side, the first lens group G 1 having a negative refractive power, and the first lens group having a positive refractive power. It consists of two lens group G2, aperture stop S, third lens group G3 with negative refractive power, and fourth lens group G4 with positive refractive power.
- the first lens group G 1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
- the negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.
- the second lens group G 2 includes, in order from the object side, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a plano-concave negative lens with the plane facing the image plane I side.
- the third lens group G3 is composed of, in order from the object side, a cemented lens of a positive meniscus lens having a concave surface facing the object side and a biconcave negative lens.
- the fourth lens group G4 includes, in order from the object side, a positive meniscus lens having a concave surface facing the object side, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface facing the image surface I side. Become.
- the aperture stop S is located between the second lens group G 2 and the third lens group G 3 and moves together with the third lens group G 3 when zooming from the wide-angle end state to the telephoto end state. To do.
- the first lens unit G 1 moves along a convex locus toward the image plane I, and the second lens unit G 2 and the fourth lens unit G 4 are integrated.
- the third lens group G3 moves to the object side.
- the blur of the photographed image is corrected by shifting the entire third lens group G3 in the direction orthogonal to the optical axis.
- the image stabilization coefficient ⁇ is 1.02
- the focal length is Since the distance is 18.5 (mm), the amount of movement of the third lens group G 3 for correcting the rotational blur of 0.734 ° is .232 (mm).
- the image stabilization coefficient K is 1.71 and the focal length is 53.4 (mm), so the third lens group for correcting rotational blur of 0.432 °.
- the amount of movement of G 3 is 0.235 ( ⁇ ).
- Table 5 below shows specifications of the variable magnification optical system having the image stabilization function according to the fifth example.
- Figures 18A and 18B show the variable magnification optical system having the image stabilization function according to the fifth example.
- Fig. 4 shows various aberration diagrams at the wide-angle end when focusing on infinity, and a meridional lateral aberration diagram when image blur correction is performed.
- FIG. 19 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the fifth example.
- FIGS. 20A and 20B are diagrams showing various aberrations in the telephoto end state at the time of focusing at infinity and image blur correction in the variable magnification optical system having the image stabilization function according to the fifth example. The meridional transverse aberration diagram is shown.
- variable magnification optical system having the anti-vibration function according to Example 5 has excellent imaging performance by correcting various aberrations well from the wide-angle end state to the telephoto end state. Recognize.
- FIG. 21 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the sixth example of the second embodiment.
- variable magnification optical system having the image stabilization function includes, in order from the object side, a first lens group G 1 having a negative refractive power, a first lens group having a positive refractive power. It consists of two lens group G2, aperture stop S, third lens group G3 with negative refractive power, and fourth lens group G4 with positive refractive power.
- the first lens group G 1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a negative meniscus lens having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side.
- the most object-side negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the image-side glass lens surface.
- the second lens group G 2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a biconvex positive lens.
- the third lens group G3 is composed of a positive meniscus lens having a concave surface facing the object side and a biconcave negative lens in order from the object side, and a negative meniscus lens having a convex surface facing the object side. .
- the fourth lens group G4 is a positive meniscus lens with a concave surface facing the object side in order from the object side. And a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface facing the image plane I.
- the aperture stop S is located between the second lens group G 2 and the third lens group G 3 and moves together with the third lens group G 3 when zooming from the wide-angle end state to the telephoto end state. To do.
- the first lens unit G1 moves along a convex locus toward the image plane I, and the second lens unit G2 and the fourth lens unit G4 are integrated.
- the third lens group G3 moves to the object side.
- variable magnification optical system having the image stabilization function the blur of the photographed image is corrected by shifting the cemented negative lens on the object side in the third lens group G3 in a direction perpendicular to the optical axis. is doing.
- the image stabilization coefficient K is 0.807, and the focal length is 18: 5 (mm), so the third lens for correcting rotational blur of 0.736 °
- the movement of group G 3 is 0.294 (mm).
- the image stabilization coefficient K is 1.321, and the focal length is 53.4 (mm), so the third lens for correcting the rotational blur of 0.433 °.
- Group G 3 moves 0.36 (mm).
- Table 6 below shows values of specifications of the variable magnification optical system having the image stabilization function according to the sixth example.
- FIGS. 22A and 22B are graphs showing various aberrations in the wide-angle end state of the zoom optical system having the image stabilization function according to the sixth example when focused at infinity, and the meridional transverse aberration when image blur correction is performed.
- FIG. 23 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the sixth example.
- FIGS. 24A and 24B are diagrams showing various aberrations in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the sixth example, and the meridional horizontal when the image blur correction is performed. An aberration diagram is shown.
- variable magnification optical system having the image stabilization function according to the second example has excellent imaging performance by properly correcting various aberrations from the wide-angle end state to the telephoto end state. I understand that.
- FIG. 25 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to Example 7 of Embodiment 2.
- the variable magnification optical system having the image stabilization function according to the seventh example includes a first lens group G 1 having a negative refractive power and an aperture stop S in order from the object side, as shown in FIG. It consists of a second lens group G 2 having a refractive power, a third lens group G 3 having a negative refractive power, and a fourth lens group G 4 having a positive refractive power.
- the first lens group G 1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
- the negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the lens surface on the image plane I side.
- the second lens group G 2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, an aperture stop S, and a positive meniscus facing the convex surface toward the object side. It consists of a lens.
- the third lens group G3 is composed of, in order from the object side, a cemented lens of a positive meniscus lens having a concave surface facing the object side and a biconcave negative lens.
- the fourth lens group G4 includes, in order from the object side, a positive meniscus lens having a concave surface facing the object side, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface facing the image surface I side. Become.
- the aperture stop S is located in the second lens group G2, and moves together with the second lens group G2 when zooming from the wide-angle end state to the telephoto end state.
- the first lens unit G 1 moves along a convex locus toward the image plane I, and the second lens unit G 2 and the fourth lens unit G 4 are integrated.
- the third lens group G3 moves to the object side.
- the blur of the photographed image is corrected by shifting the third third lens group G3 in the direction orthogonal to the optical axis.
- the anti-vibration coefficient 2 is 1.0 2 4 and the focal length is 18.5 (mm), so the rotational blur of 0.7 3 4 ° is corrected. Therefore, the movement amount of the third lens group G3 is 0.2 3 1 (mm).
- the anti-vibration coefficient K is 1.674 and the focal length is 53.4 (mm)
- the amount of movement of the third lens group G3 to correct the rotation blur of 0.432 ° is 0. 24 1 (mm).
- Table 7 below shows values of specifications of the variable magnification optical system having the image stabilization function according to the seventh example.
- FIGS. 26A and 26B are diagrams showing various aberrations in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to Example 7, and the merit when image blur correction is performed.
- a diagram of the diagonal transverse aberration is shown.
- FIG. 27 is a diagram of various aberrations in the intermediate focal length state when the variable magnification optical system having the image stabilization function according to the seventh example is focused at infinity.
- Figures 28A and 28B are diagrams showing various aberrations in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the seventh example, and when image blur correction is performed.
- the meridional transverse aberration diagram is shown.
- variable magnification optical system having the anti-vibration function according to Example 7 has excellent imaging performance by properly correcting various aberrations from the wide-angle end state to the telephoto end state. I understand that.
- FIG. 29 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to Example 8 of Embodiment 2.
- variable magnification optical system having the image stabilization function according to the eighth example includes, in order from the object side, the first lens group G 1 having negative refractive power, the first lens group having positive refractive power, 2 lens group G2, aperture stop S, third lens group G3 with negative refractive power, fixed aperture FS, and fourth lens group G4 with positive refractive power.
- the first lens group G 1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
- the negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.
- the second lens group G 2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.
- the third lens group G3 is composed of, in order from the object side, a cemented lens of a positive meniscus lens having a concave surface facing the object side and a biconcave negative lens.
- the fourth lens group G 4 is composed of, in order from the object side, a positive meniscus lens having a concave surface facing the object side, a biconvex positive lens, and a negative meniscus lens having a convex surface facing the image surface I side. Consists of a lens.
- the aperture stop S is located between the second lens group G2 and the third lens group G3, and the fixed diaphragm FS is located between the third lens group G3 and the fourth lens group G4. Both move together with the third lens group during zooming from the zoom position to the telephoto end.
- the first lens group G 1 moves along a convex locus toward the image plane I, and the second lens group G 2 and the fourth lens group G are integrated.
- the third lens group G3 moves to the object side.
- the blur of the photographed image is corrected by shifting the entire third lens group G3 in a direction perpendicular to the optical axis.
- the third for correcting rotational blur of 0.731 ° The moving amount of the lens group G3 is 0.202 (mm).
- the image stabilization coefficient K is 1.906, and the focal length is 53.4 (mm), so 0.432.
- the amount of movement of the third lens group G 3 for correcting the rotational blur is 0.221 1 (mm).
- Table 8 below shows values of specifications of the variable magnification optical system having the image stabilization function according to the eighth example.
- Figures 30 and 3OB are graphs showing various aberrations in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to Example 8, and the merit when image blur correction is performed.
- a diagram of the diagonal transverse aberration is shown.
- FIG. 31 shows various aberration diagrams in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the eighth example.
- Figures 3 2A and 3 2B are graphs showing various aberrations in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to Example 8, and when image blur correction was performed.
- a meridional transverse aberration diagram is shown.
- variable magnification optical system having the image stabilization function according to Example 8 has excellent imaging performance by properly correcting various aberrations from the wide-angle end state to the telephoto end state. I understand.
- FIG. 33 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to Example 9 of the second embodiment.
- variable magnification optical system having the image stabilization function includes, in order from the object side, the first lens group G 1 having negative refractive power, the first lens group having positive refractive power, 2 lenses It consists of group G2, aperture stop S, third lens group G3 with negative refractive power, and fourth lens group G4 with positive refractive power.
- the first lens group G 1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a negative meniscus lens having a convex surface facing the object side, and a positive meniscus lens having a convex surface facing the object side.
- the most negative meniscus lens on the object side is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image side.
- the second lens group G 2 includes, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a biconvex positive lens.
- the third lens group G 3 includes, in order from the object side, a cemented negative lens composed of a positive meniscus lens having a concave surface facing the object side and a biconcave negative lens, a positive meniscus lens having a convex surface facing the object side, and an object. And a negative meniscus lens having a convex surface on the side.
- the fourth lens group G4 includes, in order from the object side, a positive meniscus lens having a concave surface facing the object side, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed to the image surface I. Become.
- the aperture stop S is located between the second lens group G 2 and the third lens group G 3 and moves together with the third lens group G 3 when zooming from the wide-angle end state to the telephoto end state. To do.
- the first lens unit G 1 moves along a convex locus toward the image plane I, and the second lens unit G 2 and the fourth lens unit G 4 are integrated.
- the third lens group G3 moves to the object side.
- variable magnification optical system having the image stabilization function the cemented negative lens on the object side in the third lens group G 3 and the positive meniscus lens having a convex surface facing the object side are orthogonal to the optical axis.
- the camera shake is corrected by shifting in the direction.
- the image stabilization coefficient K is 1.086 and the focal length is 18.7 (mm), so that the rotational blur of 0.73 1 ° is corrected. Therefore, the moving amount of the third lens group G3 is 0.2 18 (mm). In the telephoto end state of the present embodiment, the image stabilization coefficient K is 1.792, and the focal length is 53.4 (mm). The amount of movement of the third lens group G 3 for correcting the rotational blur of 0.43 2 ° is 0.225 (mm).
- Table 9 below shows values of specifications of the variable magnification optical system having the image stabilization function according to Example 9.
- Figures 34A and 34B are diagrams showing various aberrations in the wide-angle end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the ninth example, and the merit when the image blur correction is performed.
- a diagram of the diagonal transverse aberration is shown.
- FIG. 35 is a diagram showing various aberrations in the intermediate focal length state at the time of focusing on the infinity of the variable magnification optical system having the image stabilization function according to the ninth example.
- variable magnification optical system having the anti-vibration function according to the ninth example has excellent imaging performance by properly correcting various aberrations from the wide-angle end state to the telephoto end state. I understand that. '
- variable magnification optical system having a vibration isolating function according to the third embodiment of the present application. Having a vibration isolating vibration isolator functional function according to the 33rd embodiment.
- the variable-magnification optical system is composed of, in order from the object body side, the 11th Renrens group having negative and negative bending power, A 22nd Renrenz group with positive and negative bending power, a 33rd Renrens group with negative and negative bending power, and positive and negative It has the 44th Renrenz group having the bending and bending refracting power of the above, and it is zoomed in the telephoto state from the wide and wide angle end state to the telephoto state 3 ⁇ 43 ⁇ 411 state.
- the interval between the 22nd Renrens group and the 33rd Renrens group is changed to 2200, and No. 33
- the Renrenz group moves, and the 33rd At least a part of the Renrenz group can be shifted in the direction perpendicular to the optical axis and at the time of occurrence of image blurring.
- the anti-vibration and anti-vibration Lehrenz group that performs the image surface correction is corrected.
- the above-mentioned anti-vibration and anti-vibration Lehrenz group is at least 11 and above. This has a non-spherical spherical surface, and satisfies the following conditional expressions ((11)), and ((22)): Is a special feature. .
- Conditional expression (1) defines the refractive power of the second lens group, but since it has already been described above, a duplicate description is omitted.
- Conditional expression (2) defines the refractive power of the third lens group, but since it has already been described above, a duplicate description is omitted.
- a high zoom ratio can be achieved by increasing the distance between the second lens group and the third lens group and decreasing the distance between the third lens group and the fourth lens group. This is preferable because the variation in spherical aberration during zooming can be reduced.
- at least one aspheric surface in the third lens group has a weak positive refractive power or a negative refractive power from the optical axis toward the periphery compared to a spherical surface having a paraxial radius of curvature. Further, the following conditions (8), (9), and (1 0) are satisfied with the formed shape.
- H is the effective diameter of the aspheric lens
- ASPd O. 5 is the deviation between the paraxial radius of curvature and the aspheric shape at 50% of the aspheric effective diameter
- ASPd l. 0 is the effective diameter of the aspheric surface. The deviation between the paraxial radius of curvature and the aspherical shape at a height of 100% is shown.
- Conditional expressions (8), (9), and (10) are aspherical shapes that minimize degradation of imaging performance when the third lens group, which is an anti-vibration lens group, is moved in the direction orthogonal to the optical axis. Stipulate. If the lower limit of conditional expression (8) and conditional expression (9) is exceeded, the effect of aspherical correction cannot be achieved, and the number of lenses increases to correct various aberrations. Or, it is not desirable because the coma aberration deteriorates. On the other hand, above conditional expression (8) and conditional expression (9) If the limit value is exceeded, correction of various aberrations such as spherical aberration becomes excessive, and at the same time, the imaging performance deteriorates when the anti-vibration lens is moved.
- the aspherical surface is formed so that the positive refractive power gradually increases from the optical axis toward the periphery or the negative refractive power becomes weaker than a spherical surface having the same paraxial curvature half.
- various aberrations of the on-axis light beam and off-axis light beam can be efficiently corrected when the vibration-proof lens moves. If the upper limit value of conditional expression (1 0) is exceeded, spherical aberration and coma aberration will occur in the anti-vibration lens group when moving the anti-vibration lens, and the imaging performance after movement will deteriorate. Will be invited.
- the variable magnification optical system having the image stabilization function it is desirable to have a cemented lens in the third lens group. By adopting such a configuration, it is possible to maintain good lateral chromatic aberration during image stabilization.
- the first lens group has at least one aspherical surface and includes three or less lenses. With such a configuration, the total lens length can be shortened, and the curvature of field can be corrected well.
- the lens closest to the object side in the first lens group is a negative lens having an aspheric surface on the image side surface. With this configuration, it is possible to satisfactorily correct field curvature and wide-angle coma.
- the fourth lens group is composed of three or less lenses and has at least one aspherical surface. With this configuration, the overall lens length can be shortened and coma can be corrected well.
- it is desirable that at least one cemented lens is provided in each of the second lens group to the fourth lens group. With such a configuration, it is possible to maintain good chromatic aberration, particularly lateral chromatic aberration, that occurs during zooming.
- it is desirable that the lens surface closest to the image surface is convex toward the image surface.
- the curvature of field is satisfactorily corrected, and ghost caused by reflected light from the image plane can be reduced.
- various aberrations such as spherical aberration can be obtained. The difference can be corrected well.
- the aperture stop moves together with the third lens group when zooming from the wide-angle end state to the telephoto end state, thereby reducing variations in various aberrations such as spherical aberration during zooming. can do.
- variable magnification optical system having an image stabilization function according to each numerical example of the third embodiment will be described with reference to the accompanying drawings.
- FIG. 37 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to Example 10 of the third embodiment.
- the zoom optical system having the image stabilization function according to Example 10 has, in order from the object side, the first lens group G 1 having a negative refractive power, and a positive refractive power. It consists of the second lens group G2, the aperture stop S, the third lens group G'3 with negative refractive power, and the fourth lens group G4 with positive refractive power.
- the first lens group G 1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
- the negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.
- the second lens group G 2 is composed of, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.
- the third lens group G3 is composed of a cemented lens composed of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens in order from the object side.
- the fourth lens group G4 is composed of, in order from the object side, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface facing the image plane I side.
- the aperture stop S is disposed between the second lens group G 2 and the third lens group G 3 and has a wide angle.
- zooming from the end state to the telephoto end state it moves with the third lens group G3.
- the first lens unit G 1 moves along a convex locus toward the image plane I, and the second lens unit G2, the third lens unit G3, the fourth lens unit
- the lens group G 4 moves to the object side.
- the blur of the photographed image is corrected by shifting the third lens group G3 in the direction orthogonal to the optical axis.
- the image stabilization coefficient K is 1.155, and the focal length is 18.7 (mm). Therefore, the third lens for correcting rotational blur of 0.731 ° The amount of movement of the group is 0.207 (mm).
- the image stabilization coefficient K is 1.845, and the focal length is 53.3 (mm), so the third lens group for correcting rotational blur of ⁇ -433 ° The amount of movement is 0.218 (mm).
- Table 10 below shows specification values of the variable magnification optical system having the image stabilization function according to Example 10.
- Figures 3 8 A and 3 8 B show aberration diagrams of the variable magnification optical system having the image stabilization function according to Example 10 in the wide-angle end state when focused at infinity
- Figure 3 8 A shows image blur correction
- Fig. 38B shows the meridional lateral aberration when image blur correction is performed.
- FIG. 39 is a diagram of various aberrations in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to Example 10.
- FIGS. 40A and 4OB show aberration diagrams in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to Example 10.
- FIG. 4OA shows image blur correction.
- ⁇ 40 B shows meridional lateral aberration when image blur correction is performed. From the various aberration diagrams, the variable magnification optical system having the anti-vibration function according to Example 10 has excellent imaging performance by properly correcting various aberrations from the wide-angle end state to the telephoto end state. I understand that.
- FIG. 41 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the first example of the third embodiment.
- the variable magnification optical system having the image stabilization function according to the first example has, in order from the object side, the first lens group G 1 having a negative refractive power and a positive refractive power. It consists of a second lens group G2, an aperture stop S, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power.
- the first lens group G 1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
- the negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.
- the second lens group G2 includes, in order from the object side, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a biconcave negative lens.
- the third lens group G3 is composed of a cemented lens composed of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens in order from the object side.
- the fourth lens group G4 is composed of a cemented lens composed of a biconvex positive lens and a negative meniscus lens having a convex surface facing the image plane I.
- the cemented lens has a resin layer on the glass lens surface on the object side. It is an aspherical lens in which an aspherical surface is formed.
- the aperture stop S is located between the second lens group G 2 and the third lens group G 3 and moves together with the third lens group G 3 when zooming from the wide-angle end state W to the telephoto end state T. To do.
- the first lens group G1 moves along a convex locus toward the image plane I, and the second lens group G2, the third lens group G3, and the fourth lens
- the lens group G 4 moves to the object side.
- the image stabilization coefficient K is 1.024, and the focal length is 19.0 (mm), so that the third for correcting rotational blur of 0.725 ° is used.
- the amount of movement of the lens group is 0.234 (mm).
- the image stabilization coefficient K is 1.785, and the focal length is 54.0 (mm). Therefore, the third lens for correcting rotational blur of 0.430 ° is used.
- the movement of the group is 0.227 (mm).
- Table 11 shows the values of the variable magnification optical system having the image stabilization function according to the first example.
- Figures 42A and 42B show the infinite range of the variable magnification optical system with the image stabilization function according to the first example.
- Fig. 4 2 ⁇ shows various aberrations when no image blur correction is performed
- Fig. 4 2 B shows the meridional horizontal when image blur correction is performed.
- Aberrations are shown.
- FIG. 43 is a diagram of various aberrations in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example.
- 4A and 4B show aberration diagrams in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first example 1
- FIG. 4 4A shows image blur correction.
- variable magnification optical system having the anti-vibration function according to the first example corrects various aberrations well from the wide-angle end state to the telephoto end state, and has excellent imaging performance. I understand that power s.
- FIG. 45 is a cross-sectional view showing the lens configuration in the wide-angle end state of the variable magnification optical system having the image stabilization function according to the first to second examples of the third embodiment.
- the variable magnification optical system having the image stabilization function according to the first and second examples has, in order from the object side, the first lens group G 1 having a negative refractive power and a positive refractive power. It consists of a second lens group G2, an aperture stop S, a third lens group G3 having a negative refractive power, and a fourth lens group G4 having a positive refractive power.
- the first lens group G 1 includes, in order from the object side, a negative meniscus lens having a convex surface facing the object side, a biconcave negative lens, and a positive meniscus lens having a convex surface facing the object side.
- the negative meniscus lens is an aspherical lens in which an aspherical surface is formed by providing a resin layer on the glass lens surface on the image plane I side.
- the second lens group G 2 is composed of, in order from the object side, a cemented lens of a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.
- the third lens group G3 is composed of a cemented lens composed of a positive meniscus lens having a concave surface directed toward the object side and a biconcave negative lens in order from the object side.
- the fourth lens group G4 is composed of, in order from the object, a biconvex positive lens, and a cemented lens of a biconvex positive lens and a negative meniscus lens having a convex surface directed toward the image plane I side.
- the aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the third lens group G3 when zooming from the wide-angle end state to the telephoto end state.
- the first lens unit G 1 moves along a convex locus toward the image plane I, and the second lens unit G2, the third lens unit G3, the fourth lens unit
- the lens group G 4 moves to the object side.
- the blur of the photographed image is corrected by shifting the third lens group G3 in the direction orthogonal to the optical axis.
- the image stabilization coefficient K is 1.162, and the focal length is 18.5 (mm). Therefore, the third lens for correcting the rotation blur of 0.734 °
- the movement of the group is 0.204 (mm).
- the image stabilization coefficient K is 2.037, and the focal length is 53.5 (mm), so the third lens group for correcting rotational blur of 0.432 °.
- the amount of movement is 0.1 98 (mm).
- Table 12 below shows the specifications of the variable magnification optical system having the image stabilization function according to the twelfth example.
- Figures 4 6 A and 4 6 B show aberration diagrams of the variable magnification optical system having the image stabilization function according to Example 1 in the wide-angle end state when focused at infinity
- Figure 4 6 A shows image blur correction
- Fig. 46B shows the meridional lateral aberration when image blur correction is performed.
- FIG. 47 is a diagram of various aberrations in the intermediate focal length state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first and second examples.
- FIGS. 48A and 48B show aberration diagrams in the telephoto end state at the time of focusing on infinity of the variable magnification optical system having the image stabilization function according to the first and second examples.
- FIG. 48A shows image blur correction.
- variable magnification optical system having the anti-vibration function according to the first and second examples corrects various aberrations well from the wide-angle end state to the telephoto end state, and has excellent imaging performance. I understand that.
- variable magnification optical system having the image stabilization function
- group configuration of the variable magnification optical system is not limited to this, and other group configurations such as the five groups are shown. Is also applicable.
- a part of the lens group, one lens group, or a plurality of lens groups is used as a focusing lens. It is good also as a structure which moves to an optical axis direction as a group.
- This focusing lens group can also be applied to autofocus, and is also suitable for driving by a motor for autofocus, such as an ultrasonic motor.
- the entire first lens group G1 or a part thereof is the focusing lens group. .
- variable power optical system that shifts the whole or a part of the third lens group G3 as a vibration-proof lens group in a direction perpendicular to the optical axis is exemplified.
- the whole group or a part thereof, in particular, the second lens group G2 and the fourth lens group G4 can be used as the anti-vibration lens group.
- the lens surface of the lens constituting the variable magnification optical system having the image stabilization function may be an aspherical surface.
- This aspherical surface may be any one of an aspherical surface by grinding, a glass mold aspherical surface obtained by molding glass into an aspherical shape, or a composite aspherical surface in which a resin provided on the glass surface is formed into an aspherical shape.
- 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 having the anti-vibration function.
- flare is reduced and high optical performance can be achieved with high contrast.
- an image pickup apparatus single-lens reflex camera equipped with a zoom lens having an image stabilization function according to the present application will be described.
- FIG. 49 is a schematic configuration diagram of an image pickup apparatus (single-lens reflex camera) equipped with a zoom lens having an image stabilization function according to the first example of the first embodiment.
- FIG. 49 light from a subject (not shown) is collected by the zoom lens 11 having the above-described anti-vibration function, reflected by the quick return mirror 12 and imaged on the focusing screen 1 3.
- the subject image formed on the focusing screen 13 is reflected by the pen prism 14 a plurality of times, and can be observed as an erect image by the photographer via the eyepiece lens 15.
- the release button When the release button is fully pressed, the quick return mirror 1 2 jumps upward, the light from the subject is received by the image sensor 16 and a captured image is acquired and recorded in a memory (not shown).
- the tilt of the camera 10 is detected by the sensor 1 7 (for example, an angle sensor) built in the imaging device (single-lens reflex camera) 10 and transmitted to the CPU 18. 1
- the amount of rotational blur is detected in 8 and the lens drive means to drive the lens group for camera shake correction in the direction orthogonal to the optical axis is driven, Image blur on the image sensor 16 is corrected.
- the image pickup apparatus 10 including the zoom lens 11 having the above-described image stabilization function is configured.
- the present invention is not limited to the above, and it is the same as the camera 10 even if a camera equipped with the zoom lens according to any one of the second to first embodiments as the photographing lens 11 is configured. Of course, the effect can be achieved.
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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CN200780027520XA CN101490594B (zh) | 2006-07-21 | 2007-07-12 | 变焦透镜系统、成像设备和变焦透镜系统的变焦方法 |
EP07791042A EP2045639A4 (en) | 2006-07-21 | 2007-07-12 | VARIABLE POWER OPTICAL SYSTEM, IMAGING DEVICE, VARIABLE ENLARGEMENT METHOD OF OPTICAL SYSTEM WITH VARIABLE POWER |
US12/303,305 US20090231708A1 (en) | 2006-07-21 | 2007-07-12 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
US13/090,936 US20110194191A1 (en) | 2006-07-21 | 2011-04-20 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
US13/545,651 US20120275032A1 (en) | 2006-07-21 | 2012-07-10 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
US14/092,748 US10437026B2 (en) | 2006-07-21 | 2013-11-27 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
Applications Claiming Priority (10)
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JP2006-199860 | 2006-07-21 | ||
JP2006199860 | 2006-07-21 | ||
JP2006341590 | 2006-12-19 | ||
JP2006-341590 | 2006-12-19 | ||
JP2006-347841 | 2006-12-25 | ||
JP2006347841A JP5082431B2 (ja) | 2006-12-25 | 2006-12-25 | 防振機能を有する変倍光学系、撮像装置、変倍光学系の変倍方法 |
JP2007177530A JP5130806B2 (ja) | 2006-07-21 | 2007-07-05 | 変倍光学系、撮像装置、変倍光学系の変倍方法 |
JP2007177540A JP5358902B2 (ja) | 2006-12-19 | 2007-07-05 | 防振機能を有する変倍光学系、撮像装置 |
JP2007-177540 | 2007-07-05 | ||
JP2007-177530 | 2007-07-05 |
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US12/303,305 A-371-Of-International US20090231708A1 (en) | 2006-07-21 | 2007-07-12 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
US13/090,936 Continuation US20110194191A1 (en) | 2006-07-21 | 2011-04-20 | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
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WO2008010563A1 true WO2008010563A1 (fr) | 2008-01-24 |
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PCT/JP2007/064300 WO2008010563A1 (fr) | 2006-07-21 | 2007-07-12 | Système optique à puissance variable, dispositif d'imagerie, procédé d'agrandissement variable d'un système optique à puissance variable |
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US (4) | US20090231708A1 (ja) |
EP (1) | EP2045639A4 (ja) |
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JP2010141441A (ja) * | 2008-12-09 | 2010-06-24 | Fujitsu Ltd | パラレル−シリアル変換器及びデータ受信システム |
US7961409B2 (en) | 2007-06-29 | 2011-06-14 | Nikon Corporation | Zoom lens system, optical apparatus, and method for zooming |
US8144403B2 (en) | 2007-06-29 | 2012-03-27 | Nikon Corporation | Zoom lens system, optical apparatus, and method for zooming |
US10437026B2 (en) | 2006-07-21 | 2019-10-08 | Nikon Corporation | Zoom lens system, imaging apparatus, and method for zooming the zoom lens system |
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WO2008075539A1 (ja) * | 2006-12-20 | 2008-06-26 | Konica Minolta Opto, Inc. | 変倍光学系、撮像装置及びデジタル機器 |
JP5544731B2 (ja) * | 2009-03-17 | 2014-07-09 | 株式会社ニコン | 撮影レンズ、及び、この撮影レンズを備えた光学機器 |
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Also Published As
Publication number | Publication date |
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EP2045639A1 (en) | 2009-04-08 |
US20110194191A1 (en) | 2011-08-11 |
US10437026B2 (en) | 2019-10-08 |
CN102608736A (zh) | 2012-07-25 |
US20140085732A1 (en) | 2014-03-27 |
CN101490594B (zh) | 2012-05-16 |
CN101490594A (zh) | 2009-07-22 |
EP2045639A4 (en) | 2012-06-13 |
US20090231708A1 (en) | 2009-09-17 |
US20120275032A1 (en) | 2012-11-01 |
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