WO2016121941A1 - Système optique à grossissement variable, instrument optique et procédé de fabrication de système optique à grossissement variable - Google Patents

Système optique à grossissement variable, instrument optique et procédé de fabrication de système optique à grossissement variable Download PDF

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Publication number
WO2016121941A1
WO2016121941A1 PCT/JP2016/052686 JP2016052686W WO2016121941A1 WO 2016121941 A1 WO2016121941 A1 WO 2016121941A1 JP 2016052686 W JP2016052686 W JP 2016052686W WO 2016121941 A1 WO2016121941 A1 WO 2016121941A1
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lens group
lens
object side
optical system
thirty
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PCT/JP2016/052686
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English (en)
Japanese (ja)
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芝山　敦史
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株式会社ニコン
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Priority to JP2016572190A priority Critical patent/JP6525015B2/ja
Publication of WO2016121941A1 publication Critical patent/WO2016121941A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—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
    • 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 -+-+

Definitions

  • the present invention relates to a variable magnification optical system, an optical apparatus, and a method for manufacturing the variable magnification optical system.
  • variable power optical system is required to be an optical system having a bright F value while having good optical performance.
  • a variable magnification optical system includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a negative refractive power, which are arranged in order from the object side.
  • the zooming is performed by changing the interval and the interval between the third lens group and the fourth lens group, and the third lens group is perpendicular to the optical axis in order to correct image blur as an anti-vibration lens group.
  • a thirty-second lens group configured to be movable so as to have a directional component, and a thirty-first lens group disposed on the object side of the thirty-second lens group, and the thirty-second lens group has a negative refractive power And satisfies the following conditional expression: 1.700 ⁇ ( ⁇ f3) / fw ⁇ 8.0000 40.0 ⁇ w ⁇ 70.0
  • f3 focal length of the third lens group
  • fw focal length of the entire system in the wide-angle end state
  • ⁇ w Half angle of view in the wide-angle end state (unit: °).
  • a variable magnification optical system includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a negative refractive power arranged in order from the object side.
  • the third lens group is used as an anti-vibration lens group by changing the distance between the lens groups.
  • a thirty-second lens group configured to be movable so as to have a component perpendicular to the optical axis in order to correct image blur, and disposed on the object side of the thirty-second lens group in the direction perpendicular to the optical axis during image blur correction.
  • f3 focal length of the third lens group
  • fw focal length of the entire system in the wide-angle end state
  • ⁇ w Half angle of view at wide angle end state (unit: °).
  • An optical apparatus includes the above-described variable magnification optical system.
  • a variable magnification optical system manufacturing method includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a negative lens, which are arranged in order from the object side. And a fourth lens group having a positive refractive power, an interval between the first lens group and the second lens group, and the second lens group and the second lens group.
  • a method of manufacturing a zoom optical system that performs zooming by changing an interval between three lens groups and an interval between the third lens group and the fourth lens group, wherein the third lens group A thirty-second lens group configured to be movable so as to have a component perpendicular to the optical axis in order to correct image blur as a vibration lens group, and a thirty-first lens group disposed on the object side of the thirty-second lens group; And the thirty-second lens group has negative refractive power and satisfies the following conditional expression: Characterized by disposing each lens in lens barrel.
  • f3 focal length of the third lens group
  • fw focal length of the entire system in the wide-angle end state
  • ⁇ w Half angle of view at wide angle end state (unit: °).
  • a variable magnification optical system manufacturing method includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a negative lens, which are arranged in order from the object side. And a fourth lens group having positive refracting power, and a method of manufacturing a variable power optical system that performs zooming by changing the distance between the lens groups.
  • the third lens group includes a thirty-second lens group configured to be movable so as to have a component perpendicular to the optical axis in order to correct image blur as an anti-vibration lens group, and an object side of the thirty-second lens group.
  • a thirty-first lens group whose position in the direction perpendicular to the optical axis does not move during image blur correction, the thirty-first lens group has a positive or negative refractive power, and the thirty-second lens group
  • Each lens in the lens barrel has negative refractive power and satisfies the following conditional expression Arrangement will be. 1.700 ⁇ ( ⁇ f3) / fw ⁇ 8.0000 40.0 ⁇ w ⁇ 70.0
  • f3 focal length of the third lens group
  • fw focal length of the entire system in the wide-angle end state
  • ⁇ w Half angle of view in the wide-angle end state (unit: °).
  • (W), (M), and (T) are cross-sectional views of the zoom optical system according to the first example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first example. is there.
  • (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the first example. is there.
  • FIG. (W), (M), and (T) are cross-sectional views of the zoom optical system according to the second example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams during focusing at infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the second example. is there.
  • FIG. (W), (M), and (T) are sectional views of the zoom optical system according to the third example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example. is there.
  • (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the third example. is there.
  • (A), (b), and (c) perform image blur correction at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example.
  • (W), (M), and (T) are cross-sectional views of the zoom optical system according to the fourth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams during focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fourth example. is there.
  • (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom optical system according to the fourth example. is there.
  • FIG. (W), (M), and (T) are cross-sectional views of the zoom optical system according to the fifth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams during focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth example. is there.
  • FIG. (W), (M), and (T) are sectional views of the zoom optical system according to the sixth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example. is there.
  • (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example. is there.
  • (A), (b), and (c) perform image blur correction at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example.
  • (W), (M), and (T) are sectional views of the zoom optical system according to the seventh example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh example. is there.
  • (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh example. is there.
  • FIG. (W), (M), and (T) are sectional views of the variable magnification optical system according to the eighth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth example. is there.
  • FIG. (W), (M), and (T) are sectional views of the variable magnification optical system according to Example 9 in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the ninth example. is there.
  • (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the ninth example. is there.
  • (A), (b), and (c) perform image blur correction at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the ninth example.
  • (W), (M), and (T) are sectional views of the zoom optical system according to the tenth example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the tenth example. is there.
  • (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the tenth example. is there.
  • FIG. (W), (M), and (T) are cross-sectional views of the zoom optical system according to the eleventh example in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams during focusing at infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the eleventh example. is there.
  • FIG. (W), (M), and (T) are sectional views of the variable magnification optical system according to Example 12 in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the twelfth example. is there.
  • (A), (b), and (c) are graphs showing various aberrations when focusing on the close-up distance in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the twelfth example. is there.
  • FIG. (W), (M), and (T) are sectional views of the variable magnification optical system according to Example 13 in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively.
  • (A), (b), and (c) are various aberration diagrams at the time of focusing at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the thirteenth example. is there.
  • FIG. It is a figure which shows an example of a structure of the camera carrying a variable magnification optical system. It is a figure which shows the outline of an example of the manufacturing method of a variable magnification optical system. It is a figure which shows the outline of an example of the manufacturing method of a variable magnification optical system.
  • FIG. 1 shows an example of the configuration of the variable magnification optical system ZL.
  • the number of lens groups, the lens configuration in each lens group, and the like can be changed as appropriate.
  • the variable magnification optical system has a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and negative refractive power, which are arranged in order from the object side.
  • a thirty-second lens group G32 configured to be movable so as to have a vertical component, and a thirty-first lens group G31 disposed on the object side of the thirty-second lens group G32. Have a refractive power of.
  • variable magnification optical system ZL has a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and negative refractive power, which are arranged in order from the object side. It has a third lens group G3 and a fourth lens group G4 having a positive refractive power, and performs zooming by changing the interval between the lens groups.
  • the third lens group G3 is an anti-vibration lens group ( VR) and a thirty-second lens group G32 configured to be movable so as to have a component perpendicular to the optical axis in order to correct image blur, and disposed on the object side of the thirty-second lens group G32.
  • the 31st lens group G31 whose position in the vertical direction does not move, the 31st lens group G31 has a positive or negative refractive power, and the 32nd lens group G32 has a negative refractive power.
  • the negative third lens group G3 is configured to have a 31st lens group G31 and a negative 32nd lens group G32, and the 32nd lens group G32 has a component in a direction perpendicular to the optical axis.
  • the F value is decreased (lightened) and the image height is increased.
  • the image height is increased.
  • manufacturing sensitivity increases and manufacturing becomes difficult.
  • a part of the third lens group G3 is an anti-vibration lens group and a lens that is on the object side of the anti-vibration lens group and is fixed in the third lens group G3 at the time of anti-vibration, the F value is reduced. Has the effect that the vibration-proof performance does not deteriorate.
  • variable magnification optical system ZL satisfies the following conditional expressions (1) and (2). 1.700 ⁇ ( ⁇ f3) / fw ⁇ 8.0000 (1) 40.0 ⁇ w ⁇ 70.0 (2)
  • f3 the third lens group G3 focal length
  • fw focal length of the entire system in the wide-angle end state
  • ⁇ w Half angle of view at wide angle end state (unit: °).
  • Conditional expression (1) is a conditional expression for defining an appropriate value of the focal length of the entire third lens group G3.
  • the F value is bright (about F2.8 to F3.5), and various aberrations including spherical aberration can be corrected well.
  • conditional expression (1) If the upper limit value of conditional expression (1) is exceeded, the focal length of the third lens group G3 becomes long, so that the zooming effect is insufficient, and it is difficult to obtain a desired zoom ratio (about twice or more). Become. Moreover, it may be difficult to correct astigmatism well.
  • conditional expression (1) is 7.000. In order to ensure the effect of the present embodiment, it is preferable that the upper limit value of the conditional expression (1) is 6.000.
  • conditional expression (1) If the lower limit value of conditional expression (1) is not reached, the focal length of the third lens group G3 becomes short, and it may be difficult to correct spherical aberration. As a result, it may be difficult to ensure a desired bright F value (about F2.8 to F3.5). Or generation
  • conditional expression (1) is 1.800. In order to ensure the effect, it is preferable that the lower limit value of the conditional expression (1) is 1.900.
  • Conditional expression (2) is a condition that defines an optimum value of the angle of view in the wide-angle end state. By satisfying this conditional expression (2), coma aberration, distortion aberration, and field curvature can be favorably corrected while having a wide angle of view.
  • conditional expression (2) is 65.0 °. In order to ensure the effect, it is preferable that the upper limit value of the conditional expression (2) is 66.0 °.
  • conditional expression (2) is 44.0 °. In order to ensure the effect, it is preferable that the lower limit value of the conditional expression (2) is 48.0 °.
  • variable magnification optical system ZL preferably satisfies the following conditional expression (3). 0.700 ⁇ f32 / f3 ⁇ 2.500 (3)
  • f32 Focal length of the 32nd lens group G32.
  • Conditional expression (3) is a conditional expression for defining the focal length of the thirty-second lens group G32, which is the image stabilizing lens group (VR), with respect to the focal length of the third lens group G3.
  • conditional expression (3) it is possible to make the amount of movement of the thirty-second lens group G32 appropriate while improving the imaging performance during image blur correction.
  • conditional expression (3) is 2.100. In order to ensure the effect, it is preferable that the upper limit value of conditional expression (3) is 1.700.
  • conditional expression (3) If the lower limit value of conditional expression (3) is not reached, the focal length of the thirty-second lens group G32 will be shortened, and the occurrence of decentration coma aberration or one-sided blur occurring during image blur correction will increase, resulting in good results during image blur correction. Image performance may not be maintained.
  • the lower limit value of conditional expression (3) is 0.800. In order to ensure the effect, it is preferable that the lower limit value of conditional expression (3) is 0.900.
  • variable magnification optical system ZL preferably satisfies the following conditional expression (4). 0.200 ⁇ f1 / f3 ⁇ 0.900 (4) However, f1: Focal length of the first lens group G1.
  • Conditional expression (4) is a conditional expression for satisfactorily correcting curvature of field and coma aberration while obtaining a wide angle of view (a half angle of view of about 50 ° or more) in the wide-angle end state.
  • the focal length of the first lens group G1 becomes long, and it may be difficult to obtain a wide angle of view (half angle of view of about 50 ° or more) in the wide-angle end state. There is. Alternatively, the total lens length and the lens diameter of the first lens group G1 are increased.
  • conditional expression (4) is 0.800. In order to ensure the effect, it is preferable to set the upper limit value of conditional expression (4) to 0.700.
  • the focal length of the first lens group G1 becomes short, and it becomes difficult to correct curvature of field and coma, and it may not be possible to realize good imaging performance. There is.
  • conditional expression (4) is 0.250. In order to secure the effect, it is preferable that the lower limit value of conditional expression (4) is 0.300.
  • variable magnification optical system ZL preferably satisfies the following conditional expression (5). 0.400 ⁇ f4 / f2 ⁇ 1.600 (5) However, f4: focal length of the fourth lens group G4, f2: focal length of the second lens group G2.
  • Conditional expression (5) is a conditional expression for defining an appropriate ratio between the focal length of the second lens group G2 and the focal length of the fourth lens group G4.
  • the focal length of the second lens group G2 becomes shorter than the focal length of the fourth lens group G4, and it may be difficult to correct spherical aberration. It becomes difficult to achieve a bright F number (about F2.8 to F3.5).
  • conditional expression (5) is 1.400. In order to ensure the effect, it is preferable that the upper limit value of the conditional expression (5) is 1.200.
  • the focal length of the second lens group G2 becomes longer than the focal length of the fourth lens group G4, and it may be difficult to reduce the total lens length.
  • conditional expression (5) is 0.500. In order to secure the effect, it is preferable that the lower limit value of conditional expression (5) is 0.600.
  • the thirty-second lens group G32 is composed of a cemented lens of a positive lens and a negative lens.
  • This configuration is effective for correcting decentration coma and one-sided blur when the 32nd lens group G32 is moved for image blur correction.
  • the lens that moves for image blur correction can be reduced in size and weight, which is effective in reducing the size of the image blur correction mechanism and the entire lens.
  • the thirty-first lens group G31 preferably has a negative lens and a positive lens.
  • This configuration is effective for correcting decentration coma and one-sided blur when the 32nd lens group G32 is moved for image blur correction.
  • the thirty-first lens group G31 is preferably composed of a negative lens and a positive lens arranged in order from the object side.
  • This configuration is effective for correcting decentration coma and one-sided blur when the 32nd lens group G32 is moved for image blur correction.
  • the thirty-first lens group G31 is preferably composed of a cemented lens of a negative lens and a positive lens arranged in order from the object side.
  • This configuration is effective for correcting decentration coma and one-sided blur when the 32nd lens group G32 is moved for image blur correction.
  • the thirty-first lens group G31 is preferably composed of a positive lens and a negative lens arranged in order from the object side.
  • This configuration is effective for correcting decentration coma and one-sided blur when the 32nd lens group G32 is moved for image blur correction.
  • the thirty-first lens group 31 includes a cemented lens of a positive lens and a negative lens arranged in order from the object side.
  • This configuration is effective for correcting decentration coma and one-sided blur when the 32nd lens group G32 is moved for image blur correction.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side. It is preferable to perform focusing by moving the 21 lens group G21 in the optical axis direction as a focusing lens group.
  • the lens group that moves during focusing can be reduced in size and weight, the entire lens system can be reduced in size, and the focusing speed during autofocus can be increased.
  • the most image-side lens surface of the thirty-second lens group G32 is preferably an aspherical surface.
  • This configuration is effective for correcting decentration coma and one-sided blur when the 32nd lens group G32 is moved for image blur correction.
  • variable magnification optical system ZL preferably satisfies the following conditional expression (6). 1.100 ⁇ A (T3.5) / A (T4.0) ⁇ 5.000 (6)
  • Aspheric amount A (T4.0): An axial ray corresponding to an F value of F / 4.0 in the telephoto end state passes through an aspherical surface formed on the lens surface closest to the image side of the thirty-second lens group G32.
  • the aspheric amount is an amount obtained by measuring the sag amount of the aspheric surface with respect to the approximate spherical surface along the optical axis on the aspheric optical axis.
  • Conditional expression (6) is a conditional expression for defining an appropriate value of the aspheric amount on the most aspherical surface on the image side of the thirty-second lens group G32.
  • conditional expression (6) If the upper limit of conditional expression (6) is exceeded, the aspheric amount of the thirty-second lens group G32 becomes excessive, and decentration coma and one-sided blur when the thirty-second lens group G32 is moved for image blur correction are corrected. Difficult to do.
  • conditional expression (6) is set to 4.000. In order to secure the effect, it is preferable that the upper limit value of conditional expression (6) is 3.000.
  • conditional expression (6) is 1.250. In order to secure the effect, it is preferable that the lower limit value of conditional expression (6) is 1.400.
  • variable magnification optical system ZL having a bright F value, a wide angle of view, and various aberrations corrected satisfactorily.
  • FIG. 53 shows an example of the configuration of a camera equipped with a variable magnification optical system.
  • the camera 1 is an interchangeable lens camera (so-called mirrorless camera) provided with the above-described variable magnification optical system ZL as the photographing lens 2.
  • this camera 1 light from an object (not shown) that is not shown is condensed by the taking lens 2, and then on the image pickup surface of the image pickup unit 3 via an OLPF (Optical Low Pass Filter) that is not shown.
  • a subject image is formed on the screen.
  • the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject.
  • This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1.
  • EVF Electronic view finder
  • variable magnification optical system ZL mounted on the camera 1 as the photographing lens 2 has a bright F value, a wide angle of view, and various aberrations due to its characteristic lens configuration, as will be understood from each of the embodiments described later. And has good optical performance. Therefore, according to the camera 1, it is possible to realize an optical apparatus having a bright F value, a wide angle of view, various aberrations being favorably corrected, and good optical performance.
  • the example of the mirrorless camera was demonstrated as the camera 1, it is not limited to this.
  • the above zooming optical system ZL is mounted on a single-lens reflex camera that has a quick return mirror in the camera body and observes a subject with a viewfinder optical system, the same effect as the camera 1 can be obtained. Can do.
  • variable magnification optical system ZL a manufacturing method of the above-described variable magnification optical system ZL will be described with reference to the drawings.
  • 54 and 55 show an outline of an example of a manufacturing method of the variable magnification optical system.
  • Each lens is arranged so as to perform zooming by changing the distance between the lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 (step ST1).
  • the third lens group G3 includes a thirty-second lens group G32 configured to be movable so as to have a component perpendicular to the optical axis in order to correct image blur as an anti-vibration lens group (VR), and a thirty-second lens group G32.
  • the thirty-first lens group G31 is arranged on the object side, and the thirty-second lens group G32 arranges each lens so as to have a negative refractive power (step ST2).
  • Each lens is arranged so as to satisfy the following conditional expressions (1) and (2) (step ST3).
  • f3 focal length of the third lens group G3
  • fw focal length of the entire system in the wide-angle end state
  • ⁇ w Half angle of view in the wide-angle end state (unit: °).
  • the thirty-first lens group G31 whose position in the direction perpendicular to the optical axis does not move during image blur correction.
  • the thirty-first lens group G31 has a positive or negative refractive power and has a thirty-second lens.
  • the lenses are arranged so as to have a negative refractive power (step ST20).
  • Each lens is arranged so as to satisfy the following conditional expressions (1) and (2) (step ST30).
  • f3 focal length of the third lens group G3
  • fw focal length of the entire system in the wide-angle end state
  • ⁇ w Half angle of view in the wide-angle end state (unit: °).
  • a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 are arranged in order from the object side.
  • a first lens group G1 a cemented lens of a biconvex lens L21, a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side, and a concave surface facing the biconvex lens L24 and the object side
  • the second lens group G2 is formed by arranging a cemented lens with a negative meniscus lens L25 facing the lens, and includes a biconcave lens L31, a biconvex lens L32, a biconcave lens L33, and a positive meniscus lens L34 having a convex surface facing the object side.
  • a cemented lens is arranged to form a third lens group G3, a biconvex lens L41, a cemented lens of a biconcave lens L42 and a biconcave lens L43, and a biconvex lens. Place the L44 and a biconcave lens L45 and the fourth lens group G4 with.
  • the third lens group G3 includes a biconcave lens L31 to a biconvex lens L32 as a thirty-first lens group G31.
  • a cemented lens of the biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side is the thirty-second lens group G32.
  • Anti-vibration lens group VR Anti-vibration lens group VR.
  • the lens groups thus prepared are arranged in the above-described procedure to manufacture the variable magnification optical system ZL.
  • variable magnification optical system ZL having a bright F value, a wide angle of view, and various aberrations corrected favorably.
  • FIG. 3 is a cross-sectional view showing a configuration of (ZL1 to ZL13) and refractive power distribution.
  • the optical axis of each lens group when changing the magnification from the wide-angle end state (W) through the intermediate focal length state (M) to the telephoto end state (T) is shown.
  • the moving direction along is indicated by an arrow.
  • variable magnification optical systems ZL1 to ZL13 In the upper part of the sectional view of the variable magnification optical systems ZL1 to ZL13, the moving direction of the focusing lens group when focusing on an object at a short distance from infinity is indicated by an arrow, and the anti-vibration lens group when correcting image blurring The state of VR is also shown.
  • each reference symbol for FIG. 1 according to the first embodiment is used independently for each embodiment in order to avoid complication of explanation due to an increase in the number of digits of the reference symbol. Therefore, even if the same reference numerals as those in the drawings according to the other embodiments are given, they are not necessarily in the same configuration as the other embodiments.
  • Tables 1 to 13 are shown below. These are tables of specifications in the first to thirteenth examples.
  • d-line (wavelength 587.562 nm) and g-line (wavelength 435.835 nm) are selected as the calculation targets of the aberration characteristics.
  • the surface number is the order of the optical surfaces from the object side along the light traveling direction
  • R is the radius of curvature of each optical surface
  • D is the next optical surface from each optical surface
  • Or nd is the refractive index of the material of the optical member with respect to the d-line
  • ⁇ d is the Abbe number based on the d-line of the material of the optical member.
  • (Di) indicates the surface interval between the i-th surface and the (i + 1) -th surface
  • (aperture stop) indicates the aperture stop S.
  • the optical surface is an aspherical surface
  • the surface number is marked with *
  • the column of curvature radius R indicates the paraxial curvature radius.
  • f is the focal length of the entire lens system
  • FNo is the F number
  • ⁇ is the half angle of view (unit: °)
  • Y is the maximum image height
  • BF is the optical axis at the time of focusing on infinity.
  • the distance from the last lens surface to the image surface I is expressed in terms of air length.
  • TL is the distance from the front lens surface to the last lens surface on the optical axis when focusing on infinity. Each one is shown.
  • Di is the surface distance between the i-th surface and the (i + 1) -th surface
  • D0 is the axial air space between the object surface and the lens surface closest to the object side of the first lens group G1
  • f represents the focal length of the entire lens system
  • ⁇ represents the photographing magnification.
  • mm is generally used for the focal length f, the radius of curvature R, the surface interval D, and other lengths, etc. unless otherwise specified.
  • the optical system is not limited to this because the same optical performance can be obtained even when proportional expansion or proportional reduction is performed.
  • the unit is not limited to “mm”, and other appropriate units can be used.
  • variable magnification optical system ZL (ZL1) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 includes a biconcave lens L31 and a biconvex lens L32 which are arranged in order from the object side.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes a biconvex lens L41, a cemented lens of a biconvex lens L42 and a biconcave lens L43, and a cemented lens of a biconvex lens L44 and a biconcave lens L45, which are arranged in order from the object side.
  • the biconcave lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization coefficient in the wide-angle end state, is ⁇ 0.73 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotation blur of 0.81 degrees is used.
  • the amount of movement is -0.32 mm.
  • the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.85 and the focal length is 23.50 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. .33 mm.
  • the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 1.14, and the focal length is 34.00 mm. 29 mm.
  • Table 1 below shows the values of each item in the first example.
  • Surface numbers 1 to 32 in Table 1 correspond to the optical surfaces m1 to m32 shown in FIG.
  • FIG. 2 is a diagram showing various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL1 according to the first example.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 3 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zoom optical system ZL1 according to the first example is in close focus.
  • FIG. 4A is a wide-angle end state
  • FIG. 4B is an intermediate focus.
  • the distance state, (c) shows the telephoto end state.
  • FNO is the F number
  • NA is the numerical aperture
  • A is the half field angle (unit: °) with respect to each image height
  • H0 is the object height.
  • d indicates the d-line
  • g indicates the aberration at the g-line.
  • those without these descriptions show aberrations at the d-line.
  • the value of the F number corresponding to the maximum aperture is shown.
  • the numerical aperture value corresponding to the maximum aperture is shown.
  • the solid line indicates the sagittal image plane
  • the broken line indicates the meridional image plane.
  • variable magnification optical system ZL1 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL2) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power. 2 lens group G2, 3rd lens group G3 which has negative refractive power, and 4th lens group G4 which has positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 is composed of a negative meniscus lens L31 arranged in order from the object side and having a concave surface directed toward the object side, and a biconvex lens L32.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes a biconvex lens L41, a cemented lens of a biconvex lens L42 and a biconcave lens L43, and a cemented lens of a biconvex lens L44 and a biconcave lens L45, which are arranged in order from the object side.
  • the biconcave lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization coefficient in the wide-angle end state, is ⁇ 0.64 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.36 mm.
  • the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.72, and the focal length is 23.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. .39 mm.
  • the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 0.95 and the focal length is 34.00 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 35 mm.
  • Table 2 shows the values of each item in the second example.
  • Surface numbers 1 to 32 in Table 2 correspond to the optical surfaces m1 to m32 shown in FIG.
  • variable magnification optical system ZL2 satisfies the conditional expressions (1) to (6).
  • FIG. 6 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) of the zoom optical system ZL2 according to the second example when focusing on infinity.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 7 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zoom optical system ZL2 according to the second example is in close focus.
  • FIG. 8 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL2 according to the second example, where (a) is a wide-angle end state, and (b) is an intermediate focus.
  • the distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL2 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL3) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group G1 having positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 includes a biconvex lens L24.
  • the third lens group G3 includes a thirty-first lens group G31 having a positive refractive power and a thirty-second lens group G32 having a negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 is composed of a negative meniscus lens L31 arranged in order from the object side and having a concave surface directed toward the object side, and a biconvex lens L32.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes a biconvex lens L41, a cemented lens of a biconvex lens L42 and a biconcave lens L43, and a cemented lens of a biconvex lens L44 and a biconcave lens L45, which are arranged in order from the object side.
  • the biconcave lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization coefficient in the wide-angle end state, is ⁇ 0.63 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.37 mm.
  • the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.73 and the focal length is 23.95 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotation blur of 0.67 degrees is ⁇ 0. .38 mm.
  • the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 0.95 and the focal length is 34.00 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 35 mm.
  • Table 3 shows the values of each item in the third example.
  • Surface numbers 1 to 31 in Table 3 correspond to the optical surfaces m1 to m31 shown in FIG.
  • variable magnification optical system ZL3 satisfies the conditional expressions (1) to (6).
  • FIG. 10 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL3 according to Example 3.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 11 is a diagram showing various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on the close-up distance of the variable magnification optical system ZL3 according to Example 3.
  • FIG. 12A is a wide-angle end state
  • FIG. The distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL3 has various aberrations from the wide-angle end state to the telephoto end state and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL4) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power. 2 lens group G2, 3rd lens group G3 which has negative refractive power, and 4th lens group G4 which has positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 includes a biconvex lens L24.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 is composed of a negative meniscus lens L31 arranged in order from the object side and having a concave surface directed toward the object side, and a biconvex lens L32.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes, in order from the object side, a biconvex lens L41, a cemented lens of a biconvex lens L42, a biconcave lens L43, and a biconvex lens L44, and a negative meniscus lens L45 having a concave surface facing the object side.
  • the negative meniscus lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.36 mm.
  • the image stabilization coefficient is ⁇ 0.77 and the focal length is 23.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.67 degrees is ⁇ 0. 37 mm.
  • the image stabilization coefficient is ⁇ 0.99 and the focal length is 34.00 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 34 mm.
  • Table 4 shows the values of each item in the fourth example.
  • Surface numbers 1 to 31 in Table 4 correspond to the optical surfaces m1 to m31 shown in FIG.
  • Table 4 shows that the variable magnification optical system ZL4 according to the fourth example satisfies the conditional expressions (1) to (6).
  • FIG. 14 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) of the zoom optical system ZL4 according to the fourth example when focusing on infinity.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 15 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zoom optical system ZL4 according to Example 4 is in close focus.
  • FIG. 16A shows a wide-angle end state
  • FIG. 16B shows an intermediate focal length state
  • FIG. 16A and 16B are lateral aberration diagrams when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL4 according to the fourth example, where FIG. 16A is a wide-angle end state, and FIG. The distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL4 has various aberrations from the wide-angle end state to the telephoto end state and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL5) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group G1 having positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 is composed of a biconvex lens L24 and a biconcave lens L25 arranged in this order from the object side.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 includes a biconcave lens L31 and a biconvex lens L32 which are arranged in order from the object side.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex lens L41 and a negative meniscus lens L42 having a concave surface facing the object side, a negative meniscus lens L43 and a biconvex lens L44 having a concave surface facing the image side. And a negative meniscus lens L46 having a concave surface facing the object side, and a negative meniscus lens L46 having a concave surface facing the object side.
  • the negative meniscus lens L46 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization lens group VR for correcting the rotation blur of 0.81 degrees is used.
  • the amount of movement is -0.36 mm.
  • the image stabilization coefficient is ⁇ 0.75 and the focal length is 23.50 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. 37 mm.
  • the image stabilization coefficient is ⁇ 1.00 and the focal length is 34.00 mm, so that the amount of movement of the image stabilization lens group VR for correcting the rotation blur of 0.57 degrees is ⁇ 0. 33 mm.
  • Table 5 shows the values of each item in the fifth example.
  • Surface numbers 1 to 34 in Table 5 correspond to the optical surfaces m1 to m34 shown in FIG.
  • variable magnification optical system ZL5 satisfies the conditional expressions (1) to (6).
  • FIG. 18 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL5 according to Example 5.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 19 is a diagram showing various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on a close distance of the variable magnification optical system ZL5 according to Example 5.
  • FIG. 20 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL5 according to the fifth example.
  • (A) is a wide-angle end state, and (b) is an intermediate focus.
  • the distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL5 has various aberrations from the wide-angle end state to the telephoto end state and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL6) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group G1 having positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 includes a biconvex lens L24.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 includes a biconcave lens L31 and a biconvex lens L32 which are arranged in order from the object side.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex lens L41 and a negative meniscus lens L42 having a concave surface facing the object side, a negative meniscus lens L43 and a biconvex lens L44 having a concave surface facing the image side. And a negative meniscus lens L45 having a concave surface facing the object side.
  • the negative meniscus lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization coefficient in the wide-angle end state, is ⁇ 0.64 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.36 mm.
  • the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.75 and the focal length is 23.50 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. 37 mm.
  • the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 0.99 and the focal length is 34.00 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 34 mm.
  • Table 6 shows the values of each item in the sixth example.
  • Surface numbers 1 to 31 in Table 6 correspond to the optical surfaces m1 to m31 shown in FIG.
  • Table 6 shows that the zoom optical system ZL6 according to Example 6 satisfies the conditional expressions (1) to (6).
  • FIG. 22 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL6 according to Example 6.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 23 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL6 according to Example 6 is in close focus.
  • FIG. 24A is a wide-angle end state
  • FIG. The distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL6 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • the zoom optical system ZL (ZL7) according to the seventh example includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power. 2 lens group G2, 3rd lens group G3 which has negative refractive power, and 4th lens group G4 which has positive refractive power.
  • the first lens group G1 includes a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a negative meniscus lens L13 having a concave surface facing the object side, and a biconvex lens L14, which are arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the negative meniscus lens L13 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a negative meniscus lens L21 arranged in order from the object side and having a concave surface directed toward the image side, and a biconvex lens L21.
  • the 22nd lens group G22 includes a biconvex lens L23.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 is composed of a negative meniscus lens L31 arranged in order from the object side and having a concave surface directed toward the object side, and a biconvex lens L32.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex lens L41 and a negative meniscus lens L42 having a concave surface facing the object side, a negative meniscus lens L43 and a biconvex lens L44 having a concave surface facing the image side. And a biconcave lens L45.
  • the biconcave lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization coefficient in the wide-angle end state, is ⁇ 0.65 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.36 mm.
  • the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.75 and the focal length is 23.50 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. 37 mm.
  • the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 0.98 and the focal length is 34.00 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotation blur of 0.57 degrees is ⁇ 0. 34 mm.
  • Table 7 shows the values of each item in the seventh example.
  • Surface numbers 1 to 30 in Table 7 correspond to the respective optical surfaces m1 to m30 shown in FIG.
  • variable magnification optical system ZL7 satisfies the conditional expressions (1) to (6).
  • FIG. 26 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL7 according to Example 7.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 27 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL7 according to the seventh example is in close focus.
  • FIG. 28 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL7 according to Example 7, where (a) is a wide-angle end state and (b) is an intermediate focus. The distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL7 has excellent various aberrations from the wide-angle end state to the telephoto end state and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL8) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power. 2 lens group G2, 3rd lens group G3 which has negative refractive power, and 4th lens group G4 which has positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 includes a biconcave lens L31 and a biconvex lens L32 which are arranged in order from the object side.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes a biconvex lens L41, a cemented lens composed of a biconvex lens L42 and a biconcave lens L43, and a cemented bilens lens L44 and a negative meniscus lens L45 having a concave surface facing the object side, arranged in order from the object side. It consists of a lens.
  • the negative meniscus lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization coefficient in the wide-angle end state, is ⁇ 0.94 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.25 mm.
  • the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 1.09 and the focal length is 24.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.67 degrees is ⁇ 0. .26 mm.
  • the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 1.39 and the focal length is 34.00 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotation blur of 0.57 degrees is ⁇ 0. 24 mm.
  • Table 8 shows the values of each item in the eighth example.
  • Surface numbers 1 to 32 in Table 8 correspond to the optical surfaces m1 to m32 shown in FIG.
  • variable magnification optical system ZL8 satisfies the conditional expressions (1) to (6).
  • FIG. 30 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) at the time of focusing on infinity of the variable magnification optical system ZL8 according to Example 8.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 31 is a diagram showing various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL8 according to Example 8 is in close focus.
  • FIG. 32 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL8 according to Example 8, where (a) is a wide-angle end state and (b) is an intermediate focus. The distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL8 has various aberrations from the wide-angle end state to the telephoto end state and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • the zoom optical system ZL (ZL9) according to the ninth example includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power. 2 lens group G2, 3rd lens group G3 which has negative refractive power, and 4th lens group G4 which has positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power, a thirty-second lens group G32 having negative refractive power, and a thirty-third lens group having positive refractive power arranged in order from the object side.
  • the thirty-first lens group G31 includes a biconcave lens L31 and a biconvex lens L32 which are arranged in order from the object side.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the thirty-third lens group G33 includes a positive meniscus lens L35 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes a biconvex lens L41, a cemented lens composed of a biconvex lens L42 and a biconcave lens L43, and a cemented bilens lens L44 and a negative meniscus lens L45 having a concave surface facing the object side, arranged in order from the object side. It consists of a lens.
  • the negative meniscus lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 and the thirty-third lens group G33 located on both sides of the thirty-second lens group G32 are fixed at the time of image blur correction.
  • the image stabilization coefficient in the wide-angle end state, is ⁇ 1.10 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.21 mm.
  • the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 1.30, and the focal length is 24.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.67 degrees is ⁇ 0. .22 mm.
  • the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 1.67 and the focal length is 34.00 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 20 mm.
  • Table 9 shows the values of each item in the ninth example.
  • Surface numbers 1 to 34 in Table 9 correspond to the respective optical surfaces m1 to m34 shown in FIG.
  • Table 9 shows that the variable magnification optical system ZL9 according to Example 9 satisfies the conditional expressions (1) to (6).
  • FIG. 34 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) of the zoom optical system ZL9 according to Example 9 at the time of focusing on infinity.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 35 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL9 according to Example 9 is in close focus.
  • FIG. 36 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL9 according to Example 9, where (a) is a wide-angle end state, and (b) is an intermediate focus. The distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL9 has various aberrations from the wide-angle end state to the telephoto end state and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL10) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
  • the third lens group G3 includes a thirty-first lens group G31 having a positive refractive power, a thirty-second lens group G32 having a negative refractive power, and a thirty-third lens group having a negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 includes a biconcave lens L31 and a biconvex lens L32 which are arranged in order from the object side.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the thirty-third lens group G33 includes a negative meniscus lens L35 having a concave surface directed toward the image side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes a biconvex lens L41, a cemented lens of a biconvex lens L42 and a biconcave lens L43, and a cemented lens of a biconvex lens L44 and a biconcave lens L45, which are arranged in order from the object side.
  • the biconcave lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 and the thirty-third lens group G33 located on both sides of the thirty-second lens group G32 are fixed at the time of image blur correction.
  • the image stabilization lens group VR for correcting the rotation blur of 0.81 degrees is used.
  • the amount of movement is -0.33 mm.
  • the anti-vibration coefficient is ⁇ 0.83 and the focal length is 23.50 mm. Therefore, the movement amount of the anti-vibration lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. 34 mm.
  • the movement amount of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 30 mm.
  • Table 10 shows the values of each item in the tenth embodiment.
  • Surface numbers 1 to 34 in Table 10 correspond to the optical surfaces m1 to m34 shown in FIG.
  • variable magnification optical system ZL10 satisfies the conditional expressions (1) to (6).
  • FIG. 38 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) of the variable magnification optical system ZL10 according to Example 10 at the time of focusing on infinity.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 39 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL10 according to Example 10 is in close focus.
  • FIG. 40 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL10 according to Example 10, where (a) is a wide-angle end state and (b) is an intermediate focus. The distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL10 has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL11) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power. 2 lens group G2, 3rd lens group G3 which has negative refractive power, and 4th lens group G4 which has positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 includes a positive meniscus lens L31 having a convex surface directed toward the image side and a negative meniscus lens L32 having a concave surface directed toward the object side, which are arranged in order from the object side.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes a biconvex lens L41, a cemented lens of a biconvex lens L42 and a biconcave lens L43, and a cemented lens of a biconvex lens L44 and a biconcave lens L45, which are arranged in order from the object side.
  • the biconcave lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization coefficient in the wide-angle end state, the image stabilization coefficient is ⁇ 0.70 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.33 mm.
  • the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.84 and the focal length is 23.50 mm. Therefore, the movement amount of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. .33 mm.
  • the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is ⁇ 1.11 and the focal length is 34.00 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 30 mm.
  • Table 11 shows the values of each item in the eleventh embodiment.
  • Surface numbers 1 to 32 in Table 11 correspond to the optical surfaces m1 to m32 shown in FIG.
  • variable magnification optical system ZL11 satisfies the conditional expressions (1) to (6).
  • FIG. 42 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) of the zoom optical system ZL11 according to the eleventh example at the time of focusing on infinity.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 43 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL11 according to Example 11 is in close focus.
  • FIG. 44A is a wide-angle end state
  • FIG. 44B is an intermediate focus.
  • the distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL11 has good various aberrations from the wide-angle end state to the telephoto end state and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL12) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group having positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 is composed of a cemented lens that is arranged in order from the object side and includes a positive meniscus lens L31 having a convex surface facing the image side and a negative meniscus lens L32 having a concave surface facing the object side.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes a biconvex lens L41, a cemented lens of a biconvex lens L42 and a biconcave lens L43, and a cemented lens of a biconvex lens L44 and a biconcave lens L45, which are arranged in order from the object side.
  • the biconcave lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization coefficient in the wide-angle end state, is ⁇ 0.67 and the focal length is 16.40 mm. Therefore, the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.35 mm.
  • the image stabilization coefficient In the intermediate focal length state, the image stabilization coefficient is ⁇ 0.80 and the focal length is 23.50 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. .35 mm.
  • the image stabilization coefficient In the telephoto end state, the image stabilization coefficient is -1.06 and the focal length is 34.00 mm, so the amount of movement of the image stabilization lens group VR for correcting 0.57 degree rotational blur is -0. 32 mm.
  • Table 12 below shows values of various specifications in the twelfth embodiment.
  • Surface numbers 1 to 31 in Table 12 correspond to the optical surfaces m1 to m31 shown in FIG.
  • variable magnification optical system ZL12 satisfies the conditional expressions (1) to (6).
  • FIG. 46 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the variable magnification optical system ZL12 according to Example 12 is in focus at infinity.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 47 is a diagram of various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL12 according to Example 12 is in close focus.
  • FIG. 48A is a wide-angle end state
  • FIG. 48B shows the telephoto end state.
  • variable magnification optical system ZL12 according to the twelfth example has various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • variable magnification optical system ZL (ZL13) includes a first lens group G1 having negative refractive power arranged in order from the object side, and a first lens group G1 having positive refractive power.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a concave surface facing the image side, a biconcave lens L12, a biconcave lens L13, and a biconvex lens L14 arranged in order from the object side.
  • the negative meniscus lens L11 is a glass mold aspheric lens in which both lens surfaces are aspherical.
  • the biconcave lens L12 is a glass mold aspheric lens having an aspheric lens surface on the object side.
  • the second lens group G2 includes a twenty-first lens group G21 having a positive refractive power and a twenty-second lens group G22 having a positive refractive power, which are arranged in order from the object side.
  • the twenty-first lens group G21 includes a biconvex lens L21 arranged in order from the object side, and a cemented lens of a negative meniscus lens L22 having a concave surface facing the image side and a positive meniscus lens L23 having a convex surface facing the object side.
  • the 22nd lens group G22 is composed of a cemented lens composed of a biconvex lens L24 and a negative meniscus lens L25 having a concave surface directed toward the object side, which are arranged in order from the object side.
  • the third lens group G3 includes a thirty-first lens group G31 having negative refractive power and a thirty-second lens group G32 having negative refractive power, which are arranged in order from the object side.
  • the thirty-first lens group G31 is composed of a cemented lens of a biconcave lens L31 and a biconvex lens L32, which are arranged in order from the object side.
  • the thirty-second lens group G32 is composed of a cemented lens which is arranged in order from the object side and includes a biconcave lens L33 and a positive meniscus lens L34 having a convex surface directed toward the object side.
  • the positive meniscus lens L34 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • the fourth lens group G4 includes a biconvex lens L41, a cemented lens of a biconvex lens L42 and a biconcave lens L43, and a cemented lens of a biconvex lens L44 and a biconcave lens L45, which are arranged in order from the object side.
  • the biconcave lens L45 is a glass mold aspheric lens having an aspheric lens surface on the image side.
  • An aperture stop S is provided between the second lens group G2 and the third lens group G3, and the aperture stop S constitutes the third lens group G3.
  • the zooming from the wide-angle end state to the telephoto end state is performed by changing each lens group interval (the interval between the first lens group G1 and the second lens group G2, the interval between the second lens group G2 and the third lens group G3,
  • the first lens group G1 is once moved to the image side and then moved to the object side so that the distance between the third lens group G3 and the fourth lens group G4 changes), and the second lens group G2 is moved to the object side.
  • the third lens group G3 is moved to the object side, and the fourth lens group G4 is moved to the object side.
  • the aperture stop S is moved to the object side integrally with the third lens group G3.
  • Focusing from infinity to a close object is performed by moving the 21st lens group G21 to the image side.
  • image blur correction on the image plane I is performed by moving the thirty-second lens group G32 as a vibration-proof lens group VR so as to have a component perpendicular to the optical axis.
  • the image stabilization coefficient ratio of the amount of image movement on the imaging surface to the amount of movement of the moving lens group in shake correction
  • K rotational blurring at an angle ⁇ is used.
  • the thirty-first lens group G31 located on the object side of the thirty-second lens group G32 is fixed at the time of image blur correction.
  • the image stabilization lens group VR for correcting the rotational blur of 0.81 degrees is used.
  • the amount of movement is -0.33 mm.
  • the anti-vibration coefficient is ⁇ 0.83 and the focal length is 23.50 mm. Therefore, the movement amount of the anti-vibration lens group VR for correcting the rotation blur of 0.68 degrees is ⁇ 0. 34 mm.
  • the image stabilization coefficient is ⁇ 1.11 and the focal length is 34.00 mm. Therefore, the amount of movement of the image stabilization lens group VR for correcting the rotational blur of 0.57 degrees is ⁇ 0. 30 mm.
  • Table 13 below shows values of various specifications in the thirteenth embodiment.
  • Surface numbers 1 to 31 in Table 13 correspond to the optical surfaces m1 to m31 shown in FIG.
  • variable magnification optical system ZL13 satisfies the conditional expressions (1) to (6).
  • FIG. 50 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) of the zoom optical system ZL13 according to Example 13 at the time of focusing on infinity.
  • (A) shows a wide-angle end state
  • (b) shows an intermediate focal length state
  • (c) shows a telephoto end state.
  • FIG. 51 is a diagram illustrating various aberrations (spherical aberration diagram, astigmatism diagram, distortion diagram, lateral chromatic aberration diagram, and lateral aberration diagram) when the zooming optical system ZL13 according to Example 13 is in close focus.
  • FIG. 52 is a lateral aberration diagram when image blur correction is performed at the time of focusing on infinity of the variable magnification optical system ZL13 according to Example 13, where (a) is a wide-angle end state and (b) is an intermediate focus. The distance state, (c) shows the telephoto end state.
  • variable magnification optical system ZL13 has good various aberrations from the wide-angle end state to the telephoto end state, and from the infinite focus state to the close-up focus state. It can be seen that it has a good optical performance. Further, it can be seen that the image formation performance is high at the time of image blur correction.
  • the F value is smaller than about F3.5 from the wide-angle end state to the telephoto end state (preferably smaller than F2.8), and the F value is substantially reduced from the wide-angle end state to the telephoto end state.
  • a variable magnification optical system that is constant, has a wide field angle of about 50 or more at a half field angle, and has various aberrations corrected satisfactorily can be realized.
  • variable magnification optical system ZL As a numerical example of the variable magnification optical system ZL, a four-group configuration is shown, but the present invention is not limited to this, and can be applied to other group configurations (for example, five groups). Specifically, a configuration in which a lens or a lens group is added closest to the object side or a configuration in which a lens or a lens group is added closest to the image side may be used.
  • the lens group refers to a portion having at least one lens separated by an air interval that changes at the time of zooming or focusing.
  • variable magnification optical system ZL in order to focus from infinity to a short distance object, a part of the lens group, one entire lens group, or a plurality of lens groups is moved in the optical axis direction as a focusing lens group.
  • a configuration may be adopted.
  • such a focusing lens group can be applied to autofocus, and is also suitable for driving by an autofocus motor (for example, an ultrasonic motor).
  • an autofocus motor for example, an ultrasonic motor.
  • variable magnification optical system ZL either one of the entire lens group or the partial lens group is moved so as to have a component in a direction perpendicular to the optical axis, or rotated (oscillated) in an in-plane direction including the optical axis.
  • a vibration-proof lens group that corrects image blur caused by camera shake may be used.
  • a fixed lens may be disposed on the image side of the thirty-second lens group G32 during image stabilization.
  • the lens surface may be formed as a spherical surface, a flat surface, or an aspherical surface.
  • the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to processing and assembly adjustment errors can be prevented. Further, even when the image plane is deviated, there is little deterioration in drawing performance.
  • the lens surface is an aspheric surface
  • the aspheric surface is an aspheric surface by grinding, a glass mold aspheric surface made of glass with an aspheric shape, or a composite aspheric surface made of resin with an aspheric shape on the glass surface. Any aspherical surface may be used.
  • the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
  • GRIN lens gradient index lens
  • the aperture stop S is preferably arranged in the vicinity of the third lens group G3.
  • a lens frame may be used instead of a member as an aperture stop.
  • each lens surface may be provided with an antireflection film having a high transmittance in a wide wavelength region in order to reduce flare and ghost and achieve good optical performance with high contrast.
  • variable magnification optical system ZL can have a variable magnification ratio of about twice.
  • ZL ZL1 to ZL13
  • Variable magnification optical system G1 First lens group G2 Second lens group G21 21st lens group (focusing lens group) G22 22nd lens group G3 3rd lens group G31 31st lens group G32 32nd lens group (anti-vibration lens group) G33 33rd lens group G4 4th lens group S Aperture stop I Image surface 1 Camera (optical equipment)

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Abstract

L'invention concerne un système optique à grossissement variable qui comprend, dans l'ordre à partir du côté objet, un premier groupe de lentilles (G1) ayant une puissance de réfraction négative, un deuxième groupe de lentilles (G2) ayant une puissance de réfraction positive, un troisième groupe de lentilles (G3) ayant une puissance de réfraction négative, et un quatrième groupe de lentilles (G4) ayant une puissance de réfraction positive, et fait varier le grossissement en changeant l'intervalle entre le premier groupe de lentilles et le deuxième groupe de lentilles, l'intervalle entre le deuxième groupe de lentilles et le troisième groupe de lentilles, et l'intervalle entre le troisième groupe de lentilles et le quatrième groupe de lentilles. Le troisième groupe de lentilles comprend un 32ème groupe de lentilles (G32) qui, afin de corriger un flou d'image comme un groupe de lentilles de réduction des vibrations (VR), est configuré de manière à être mobile dans une manière qui maintient un élément dans une direction orthogonale à l'axe optique, et un 31ème groupe de lentilles (G31) qui est agencé du côté objet du 32ème groupe de lentilles. Le 32ème groupe de lentilles a une puissance de réfraction négative et satisfait les conditions suivantes. 1.700 < (-f3)/fw < 8.000 40.0 < ωw < 70.0
PCT/JP2016/052686 2015-01-30 2016-01-29 Système optique à grossissement variable, instrument optique et procédé de fabrication de système optique à grossissement variable WO2016121941A1 (fr)

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