WO2021199758A1 - Zoom lens and imaging device - Google Patents

Zoom lens and imaging device Download PDF

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Publication number
WO2021199758A1
WO2021199758A1 PCT/JP2021/005992 JP2021005992W WO2021199758A1 WO 2021199758 A1 WO2021199758 A1 WO 2021199758A1 JP 2021005992 W JP2021005992 W JP 2021005992W WO 2021199758 A1 WO2021199758 A1 WO 2021199758A1
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Prior art keywords
lens group
lens
positive
conditional expression
zoom
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PCT/JP2021/005992
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French (fr)
Japanese (ja)
Inventor
哲一朗 奥村
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ソニーグループ株式会社
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Priority to JP2022511647A priority Critical patent/JPWO2021199758A1/ja
Publication of WO2021199758A1 publication Critical patent/WO2021199758A1/en

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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
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length

Definitions

  • the present technology relates to a technical field of a zoom lens having a plurality of lens groups and an image pickup apparatus in which such a zoom lens is used.
  • Optical systems with various focal lengths and diameters are required for photographing optical systems used in imaging devices such as still cameras and video cameras.
  • a telephoto zoom lens capable of magnifying a distant subject at a desired angle of view is required to have high image quality, small size and light weight, and to be able to perform quick focusing at a high zoom ratio.
  • a positive lead type zoom lens in which a lens group having the most positive refractive power is arranged on the object side is known (see, for example, Patent Document 1 and Patent Document 2).
  • chromatic aberration such as axial chromatic aberration and Magnification chromatic aberration.
  • the most effective method for correcting chromatic aberration is to use anomalous partially dispersed glass in the group located closest to the object that passes through a position where both the on-axis luminous flux diameter and the off-axis luminous flux diameter are high, and use it to correct chromatic aberration. There is a method to do.
  • the zoom lens according to the present technology has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens The group is fixed at the time of magnification change, the second lens group and the third lens group are moved at the time of magnification change, and the first lens group is composed of four or less lenses. It satisfies (2).
  • f1 Focal length of the first lens group
  • f2 Focal length of the second lens group
  • m2 Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end
  • m3 From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
  • the total refractive power of the first lens group and the second lens group is increased, the refractive power of the first lens group is optimized, and the diameter of the light beam incident on the second lens group at the telephoto end is reduced. At the same time, the magnification reduction effect during zooming by the second lens group is suppressed.
  • the refractive power of the first lens group is optimized.
  • the refractive power of the first lens group is optimized.
  • the diameter of the light beam incident on the second lens group at the telephoto end becomes smaller, and the magnification reduction effect during zooming by the second lens group is suppressed.
  • focusing is performed by a group having a small volume and a small weight with respect to the whole system or a part thereof.
  • the imaging device includes a zoom lens and an imaging element that converts an optical image formed by the zoom lens into an electrical signal, and the zoom lenses are arranged in order from the object side to the image side. It has a positive first lens group, a positive second lens group, and a negative third lens group, the first lens group is fixed at the time of magnification change, and the second lens group and the third lens group are changed. It is moved at the time of magnification, and the first lens group is composed of four or less lenses, and satisfies the following conditional equations (1) and (2).
  • f1 Focal length of the first lens group
  • f2 Focal length of the second lens group
  • m2 Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end
  • m3 From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
  • the zoom lens As a result, in the zoom lens, the total refractive power of the first lens group and the second lens group is increased, the refractive power of the first lens group is optimized, and the light beam incident on the second lens group at the telephoto end is increased. As the diameter of the lens becomes smaller, the magnification reduction effect during zooming by the second lens group is suppressed.
  • FIGS. 2 to 73 an embodiment of the zoom lens and the image pickup apparatus of the present technology is shown, and this figure is a diagram showing a lens configuration at a wide-angle end at infinity according to the first embodiment of the zoom lens. .. It is a figure which shows the lens structure of the wide-angle end in the nearest vicinity of the 1st Embodiment of a zoom lens. It is a figure which shows the lens structure of the intermediate focal length at infinity of the 1st Embodiment of a zoom lens. It is a figure which shows the lens structure of the intermediate focal length in the nearest vicinity of the 1st Embodiment of a zoom lens.
  • the zoom lens of the present technology has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens group is fixed at the time of magnification change.
  • the second lens group and the third lens group are moved at the time of magnification change, and the first lens group is composed of four or less lenses, and satisfies the following conditional equations (1) and (2).
  • f1 Focal length of the first lens group
  • f2 Focal length of the second lens group
  • m2 Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end
  • m3 From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
  • a lens having a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens group has four or less lenses.
  • the weight of the optical system can be reduced by being configured and fixed at the time of magnification change, and by moving the second lens group and the third lens group at the time of magnification change.
  • the number of the first lens group is small, by making the second lens group a positive lens group, the total refractive power of the first lens group and the second lens group is increased and good aberration is obtained. It is possible to make corrections.
  • conditional equation (1) is an equation for achieving weight reduction while performing good aberration correction of the optical system, and is a conditional equation for optimizing the focal length of the first lens group and the focal length of the second lens group. Is.
  • the refractive power of the first lens group weakens and the diameter of the light beam incident on the second lens group becomes large, which makes it difficult to reduce the diameter of the optical system.
  • the refractive power of the first lens group becomes stronger, and it becomes difficult to correct various aberrations, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification.
  • the zoom lens satisfies the conditional equation (1)
  • the refractive power of the first lens group is optimized, the diameter of the optical system can be reduced, and various aberrations, particularly spherical aberration and axial chromatic aberration, can be achieved. And the chromatic aberration of magnification can be satisfactorily corrected.
  • the range of the conditional expression (1) can be set to the range of the following conditional expression (1A). (1A) 1.08 ⁇ f2 / f1 ⁇ 10.10 By setting the range of the conditional expression (1) to the range of the conditional expression (1A), the above-mentioned effect can be further enhanced.
  • the range of the conditional expression (1) can be set to the range of the following conditional expression (1B). (1B) 1.08 ⁇ f2 / f1 ⁇ 8.0
  • the range of the conditional expression (1) can be set to the range of the following conditional expression (1C). (1C) 1.08 ⁇ f2 / f1 ⁇ 6.0
  • the range of the conditional expression (1) can be set to the range of the conditional expression (1C)
  • the range of the conditional expression (1) can be set to the range of the following conditional expression (1D). (1D) 1.08 ⁇ f2 / f1 ⁇ 4.0
  • the range of the conditional expression (1) can be set to the range of the conditional expression (1D)
  • the range of the conditional expression (1) can be set to the range of the following conditional expression (1E). (1E) 1.08 ⁇ f2 / f1 ⁇ 2.5
  • Conditional expression (2) is a conditional expression for relatively defining the amount of movement of the second lens group and the amount of movement of the third lens group.
  • the zoom lens satisfies the condition equation (2), the diameter of the light beam incident on the second lens group at the telephoto end becomes smaller and the magnification reduction effect during zooming by the second lens group is suppressed. It is possible to reduce the diameter and increase the magnification of the optical system.
  • the range of the conditional expression (2) can be set to the range of the following conditional expression (2A). (2A) 0.59 ⁇ m2 / m3 ⁇ 0.94 By setting the range of the conditional expression (2) to the range of the conditional expression (2A), the above-mentioned effect can be further enhanced.
  • the zoom lens of the present technology it is possible to provide a zoom lens that is lightweight and has satisfactorily corrected various aberrations.
  • Conditional formula (3) is a conditional formula for defining the focal length of the first lens group relative to the combined focal length of the second lens group and the third lens group.
  • the refractive power of the first lens group becomes too strong, and it becomes difficult to correct various aberrations at the telephoto end, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification.
  • the zoom lens satisfies the conditional equation (3), the refractive power of the first lens group is optimized, and various aberrations at the telephoto end, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification can be satisfactorily corrected. This can be done and the diameter of the optical system can be reduced.
  • the range of the conditional expression (3) can be set to the range of the following conditional expression (3A). (3A) -4.2 ⁇ f1 / f23w ⁇ -2.5 By setting the range of the conditional expression (3) to the range of the conditional expression (3A), the above-mentioned effect can be further enhanced.
  • Conditional expression (4) is a conditional expression for defining the focal length of the first lens group relative to the focal length of the optical system at the telephoto end.
  • the refractive power of the first lens group becomes too strong, and it becomes difficult to correct various aberrations at the telephoto end, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification.
  • the zoom lens satisfies the conditional equation (4), the refractive power of the first lens group is optimized, and various aberrations at the telephoto end, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification can be satisfactorily corrected. This can be done and the diameter of the optical system can be reduced.
  • the range of the conditional expression (4) can be set to the range of the following conditional expression (4A). (4A) 0.45 ⁇ f1 / ft ⁇ 0.85
  • conditional expression (5) 2.1 ⁇ d1t / d2t ⁇ 9.9
  • d1t Distance between the first lens group and the second lens group at the telephoto end
  • d2t The distance between the second lens group and the third lens group at the telephoto end.
  • Conditional expression (5) is a conditional expression for relatively defining the amount of movement of the second lens group and the amount of movement of the third lens group.
  • the zoom lens satisfies the condition equation (5), the diameter of the light beam incident on the second lens group at the telephoto end becomes smaller and the magnification effect during zooming by the second lens group is suppressed.
  • the diameter of the optical system can be reduced and the magnification can be increased.
  • the range of the conditional expression (5) can be set to the range of the following conditional expression (5A).
  • the zoom lens according to the embodiment of the present technology it is desirable to focus by moving the whole or a part of the group located on the image side of the third lens group in the optical axis direction.
  • R is the paraxial radius of curvature of the i-th plane
  • d is the axial top-top spacing (thickness of the center of the lens or air spacing) between the i-th plane and the i + 1th plane
  • ⁇ d is the Abbe number on the d-line of the lens or the like starting from the i-th plane.
  • the aspherical surface is marked with * on the right side of the surface number, and the aperture diaphragm is marked with the description of "aperture" on the right side of the surface number.
  • ⁇ is a conical constant (conic constant)
  • A4", “A6”, “A8”, “A10”, “A12” are 4th, 6th, 8th, 10th, and 12th aspherical coefficients, respectively. Is shown.
  • zoom lenses used in each embodiment have an aspherical lens surface.
  • x is the distance (sag amount) in the optical axis direction from the apex of the lens surface
  • y is the height (image height) in the direction orthogonal to the optical axis direction
  • c is the lens.
  • Near-axis curvature at the apex inverse of the radius of curvature
  • ⁇ is the conical constant (conic constant)
  • A4", “A6" are the aspherical coefficients of the 4th, 6th, ... Then, it is defined by the following equation 1.
  • ⁇ First Embodiment> 1 to 6 show the lens configuration of the zoom lens 1 according to the first embodiment of the present technology.
  • the zoom lens 1 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6 arranged in order from the object side to the image side. have.
  • the first lens group G1 is provided as a positive lens group
  • the second lens group G2 is provided as a positive lens group
  • the third lens group G3 is provided as a negative lens group.
  • the first lens group G1 is fixed at the time of scaling, and the second lens group G2 and the third lens group G3 are moved at the time of scaling.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a convex surface facing the object side, a positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side to the image side.
  • the second lens group G2 is composed of a positive meniscus lens L21 with a convex surface facing the image side.
  • the third lens group G3 is composed of a negative lens L31, a positive lens L32, a negative lens L33, and a negative meniscus lens L34 with a convex surface facing the image side, in this order from the object side to the image side.
  • the positive lens L32 and the negative lens L33 are configured as a junction lens.
  • the fourth lens group G4 is composed of a negative lens L41 and a positive meniscus lens L42 with a convex surface facing the object side in order from the object side to the image side.
  • the negative lens L41 and the positive meniscus lens L42 are configured as a junction lens.
  • the fifth lens group G5 is composed of a positive lens L51, a negative meniscus lens L52 with a convex surface facing the object side, and a positive lens L53 in this order from the object side to the image side.
  • the negative meniscus lens L52 and the positive lens L53 are configured as a junction lens.
  • the sixth lens group G6 has a negative meniscus lens L61, a positive lens L62, an aperture aperture S, a positive lens L63, a negative lens L64, a positive lens L65, and an image side in order from the object side to the image side. It is composed of a positive meniscus lens L66 with a convex surface, a negative lens L67, a positive lens L68, a negative lens L69, a positive lens L610, a positive lens L611, a negative lens L612, and a negative lens L613 with a convex surface facing the image side.
  • the positive lens L63 and the negative lens L64 are configured as a junction lens
  • the positive meniscus lens L66 and the negative lens L67 are configured as a junction lens
  • the positive lens L68 and the negative lens L69 are configured as a junction lens
  • the fifth lens group G5 When focusing from infinity to a short distance, the fifth lens group G5 is moved in the optical axis direction.
  • another configuration such as a configuration in which the positive lens L610 is moved in the optical axis direction may be used.
  • vibration isolation can be performed against camera shake and the like.
  • Table 1 shows the lens data of Numerical Example 1 in which specific numerical values are applied to the zoom lens 1.
  • Table 2 shows the focal length f, the F number Fno, the half angle of view ⁇ , the image height Y, and the total optical length L of Numerical Example 1.
  • Table 4 shows the focal lengths of each lens group in Example 1.
  • FIGS. 7 to 12 are longitudinal aberration diagrams of Numerical Example 1
  • FIGS. 13 to 18 are transverse aberration diagrams of Numerical Example 1.
  • the solid line shows the value of the d line (587.56 nm)
  • the dotted line shows the value of the c line (656.27 nm)
  • the alternate long and short dash line shows the value of the g line (435.84 nm).
  • the solid line shows the value of the sagittal image plane of the d line
  • the broken line shows the value of the meridional image plane of the d line
  • the distortion shows the value of the d line.
  • the solid line indicates the value of the d line
  • the dotted line indicates the value of the c line
  • the alternate long and short dash line indicates the value of the g line.
  • the zoom lens 1 is designed to be lightweight while realizing a high-quality telephoto zoom lens.
  • the numerical embodiment 1 has various aberrations corrected well and has excellent imaging performance.
  • ⁇ Second embodiment> 19 to 24 show the lens configuration of the zoom lens 2 according to the second embodiment of the present technology.
  • the zoom lens 2 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6 arranged in order from the object side to the image side. And has a seventh lens group G7.
  • the first lens group G1 is provided as a positive lens group
  • the second lens group G2 is provided as a positive lens group
  • the third lens group G3 is provided as a negative lens group.
  • the first lens group G1 is fixed at the time of scaling, and the second lens group G2 and the third lens group G3 are moved at the time of scaling.
  • the first lens group G1 is composed of a negative meniscus lens L11, a positive lens L12, and a positive lens L13 whose convex surfaces are directed toward the object side in order from the object side to the image side.
  • the second lens group G2 is composed of a positive meniscus lens L21 having a convex surface facing the object side and a negative meniscus lens L22 having a convex surface facing the object side in order from the object side to the image side.
  • the third lens group G3 is composed of a negative lens L31, a negative lens L32, and a positive lens L33 in this order from the object side to the image side.
  • the negative lens L32 and the positive lens L33 are configured as a junction lens.
  • the fourth lens group G4 is composed of a positive lens L41, a positive lens L42, a positive lens L43, and a negative lens L44 in this order from the object side to the image side.
  • the positive lens L43 and the negative lens L44 are configured as a junction lens.
  • the fifth lens group G5 includes an aperture aperture S, a positive lens L51, a negative meniscus lens L52 with a convex surface facing the object side, a negative meniscus lens L53 with a convex surface facing the object side, and an object side in order from the object side to the image side. It is composed of a positive meniscus lens L54 with a convex surface, a positive meniscus lens L55 with a convex surface on the object side, a negative meniscus lens L56 with a convex surface on the object side, and a positive meniscus lens L57 with a convex surface on the object side.
  • the negative meniscus lens L53 and the positive meniscus lens L54 are configured as a junction lens
  • the negative meniscus lens L56 and the positive meniscus lens L57 are configured as a junction lens.
  • the sixth lens group G6 is composed of a negative meniscus lens L61, a negative lens L62, and a positive lens L63 whose convex surfaces are directed toward the object side in order from the object side to the image side.
  • the negative lens L62 and the positive lens L63 are configured as a junction lens.
  • the seventh lens group G7 includes a positive meniscus lens L71 having a convex surface facing the object side, a positive meniscus lens L72 having a convex surface facing the image side, and a negative meniscus lens L73 having a convex surface facing the image side in order from the object side to the image side. It is composed of.
  • the 6th lens group G6 When focusing from infinity to a short distance, the 6th lens group G6 is moved in the optical axis direction.
  • the fourth lens group G4 may have another configuration such as being moved in the optical axis direction. Further, by moving the negative meniscus lens L53 and the positive meniscus lens L54 constituting the bonded lens in the direction orthogonal to the optical axis direction, vibration isolation can be performed against camera shake and the like.
  • Table 5 shows the lens data of Numerical Example 2 in which specific numerical values are applied to the zoom lens 2.
  • Table 6 shows the focal length f, the F number Fno, the half angle of view ⁇ , the image height Y, and the total optical length L of Numerical Example 2.
  • Table 8 shows the 4th, 6th, 8th, 10th, and 12th aspherical coefficients A4, A6, A8, A10, and A12 of the aspherical surface in Numerical Example 2 together with the conical constant ⁇ .
  • Table 9 shows the focal lengths of each lens group in Example 2.
  • FIGS. 25 to 30 are longitudinal aberration diagrams of Numerical Example 2
  • FIGS. 31 to 36 are transverse aberration diagrams of Numerical Example 2.
  • the solid line shows the value of the d line (587.56 nm)
  • the dotted line shows the value of the c line (656.27 nm)
  • the alternate long and short dash line shows the value of the g line (435.84 nm).
  • the solid line shows the value of the sagittal image plane of the d line
  • the broken line shows the value of the meridional image plane of the d line
  • the distortion shows the value of the d line.
  • the solid line indicates the value of the d line
  • the dotted line indicates the value of the c line
  • the alternate long and short dash line indicates the value of the g line.
  • the zoom lens 2 is designed to be lightweight while realizing a high-quality telephoto zoom lens.
  • ⁇ Third embodiment> 37 to 42 show the lens configuration of the zoom lens 3 according to the third embodiment of the present technology.
  • the zoom lens 3 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6 arranged in order from the object side to the image side. have.
  • the first lens group G1 is provided as a positive lens group
  • the second lens group G2 is provided as a positive lens group
  • the third lens group G3 is provided as a negative lens group.
  • the first lens group G1 is fixed at the time of scaling, and the second lens group G2 and the third lens group G3 are moved at the time of scaling.
  • the first lens group G1 is composed of a positive meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, a positive lens L13, and a positive lens L14 in order from the object side to the image side. There is.
  • the second lens group G2 is composed of a positive meniscus lens L21 with a convex surface facing the image side.
  • the third lens group G3 is composed of a negative lens L31, a positive lens L32, a negative lens L33, and a negative lens L34 in this order from the object side to the image side.
  • the positive lens L32 and the negative lens L33 are configured as a junction lens.
  • the fourth lens group G4 is composed of a negative lens L41 and a positive meniscus lens L42 with a convex surface facing the object side in order from the object side to the image side.
  • the negative lens L41 and the positive meniscus lens L42 are configured as a junction lens.
  • the fifth lens group G5 is composed of a positive lens L51, a negative meniscus lens L52 with a convex surface facing the object side, and a positive lens L53 in this order from the object side to the image side.
  • the negative meniscus lens L52 and the positive lens L53 are configured as a junction lens.
  • the sixth lens group G6 includes a negative meniscus lens L61 with a convex surface facing the image side, a positive meniscus lens L62 with a convex surface facing the object side, an aperture aperture S, a positive lens L63, and a negative lens L64 in order from the object side to the image side.
  • Positive meniscus lens L65 with convex surface facing the object side positive lens L66, negative lens L67, positive lens L68, negative meniscus lens L69 with convex surface facing the image side
  • positive lens L610 positive meniscus with convex surface facing the image side It is composed of a lens L611, a negative meniscus lens L612 with a convex surface facing the image side, and a negative lens L613.
  • the positive lens L63 and the negative lens L64 are configured as a junction lens
  • the positive lens L66 and the negative lens L67 are configured as a junction lens
  • the positive meniscus lens L611 and the negative meniscus lens L612 are configured as a junction lens.
  • the fifth lens group G5 When focusing from infinity to a short distance, the fifth lens group G5 is moved in the optical axis direction.
  • the positive meniscus lens L611 and the negative meniscus lens L612 may have other configurations such as being moved in the optical axis direction. Further, by moving the positive lens L66 and the negative lens L67 constituting the bonded lens in the direction orthogonal to the optical axis direction, vibration isolation can be performed against camera shake and the like.
  • Table 10 shows the lens data of Numerical Example 3 in which specific numerical values are applied to the zoom lens 3.
  • Table 11 shows the focal length f, the F number Fno, the half angle of view ⁇ , the image height Y, and the total optical length L of Numerical Example 3.
  • Table 13 shows the focal lengths of each lens group in Example 3.
  • FIGS. 43 to 48 are longitudinal aberration diagrams of Numerical Example 3
  • FIGS. 49 to 54 are transverse aberration diagrams of Numerical Example 3.
  • the solid line shows the value of the d line (587.56 nm)
  • the dotted line shows the value of the c line (656.27 nm)
  • the alternate long and short dash line shows the value of the g line (435.84 nm).
  • the solid line shows the value of the sagittal image plane of the d line
  • the broken line shows the value of the meridional image plane of the d line
  • the distortion shows the value of the d line.
  • the solid line indicates the value of the d line
  • the dotted line indicates the value of the c line
  • the alternate long and short dash line indicates the value of the g line.
  • the zoom lens 3 is designed to be lightweight while realizing a high-quality telephoto zoom lens.
  • ⁇ Fourth Embodiment> 55 to 60 show the lens configuration of the zoom lens 4 according to the fourth embodiment of the present technology.
  • the zoom lens 4 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6 arranged in order from the object side to the image side. have.
  • the first lens group G1 is provided as a positive lens group
  • the second lens group G2 is provided as a positive lens group
  • the third lens group G3 is provided as a negative lens group.
  • the first lens group G1 is fixed at the time of scaling, and the second lens group G2 and the third lens group G3 are moved at the time of scaling.
  • the first lens group G1 is composed of a negative meniscus lens L11 having a convex surface facing the object side, a positive meniscus lens L12 having a convex surface facing the object side, and a positive lens L13 in order from the object side to the image side.
  • the second lens group G2 is composed of a positive meniscus lens L21 having a convex surface facing the object side and a negative meniscus lens L22 having a convex surface facing the object side in order from the object side to the image side.
  • the third lens group G3 is composed of a negative lens L31, a negative lens L32, and a positive lens L33 in this order from the object side to the image side.
  • the negative lens L32 and the positive lens L33 are configured as a junction lens.
  • the fourth lens group G4 includes a positive meniscus lens 41, a positive lens L42, a positive lens L43, a negative lens L44, an aperture aperture S, a positive lens L45, and an object side in order from the object side to the image side.
  • Negative meniscus lens L46 with convex surface negative meniscus lens L47 with convex surface toward the object side, positive meniscus lens L48 with convex surface toward the object side, positive meniscus lens L49 with convex surface toward the object side, convex surface toward the object side It is composed of a negative meniscus lens L410 directed toward the object and a positive meniscus lens L411 with a convex surface facing the object side.
  • the positive lens L43 and the negative lens L44 are configured as a junction lens
  • the negative meniscus lens L47 and the positive meniscus lens L48 are configured as a junction lens
  • the negative meniscus lens L410 and the positive meniscus lens L411 are configured as a junction lens.
  • the fifth lens group G5 is composed of a negative meniscus lens L51, a negative lens L52, and a positive lens L53 whose convex surfaces are directed toward the object side in order from the object side to the image side.
  • the negative lens L52 and the positive lens L53 are configured as a junction lens.
  • the sixth lens group G6 includes a positive meniscus lens L61 having a convex surface facing the object side, a positive meniscus lens L62 having a convex surface facing the image side, and a negative meniscus lens L63 having a convex surface facing the image side in order from the object side to the image side. It is composed of.
  • the fifth lens group G5 When focusing from infinity to a short distance, the fifth lens group G5 is moved in the optical axis direction.
  • other configurations such as a configuration in which the positive lens 41, the positive lens L42, the positive lens L43, and the negative lens L44 are moved in the optical axis direction may be used.
  • vibration isolation can be performed against camera shake and the like.
  • Table 14 shows the lens data of Numerical Example 4 in which specific numerical values are applied to the zoom lens 4.
  • Table 15 shows the focal length f, the F number Fno, the half angle of view ⁇ , the image height Y, and the total optical length L of Numerical Example 4.
  • Table 17 shows the 4th, 6th, 8th, 10th, and 12th aspherical coefficients A4, A6, A8, A10, and A12 of the aspherical surface in Numerical Example 4 together with the conical constant ⁇ .
  • Table 18 shows the focal lengths of each lens group in Example 4.
  • FIGS. 61 to 66 are longitudinal aberration diagrams of Numerical Example 4, and FIGS. 67 to 72 are transverse aberration diagrams of Numerical Example 4.
  • the solid line shows the value of the d line (587.56 nm)
  • the dotted line shows the value of the c line (656.27 nm)
  • the alternate long and short dash line shows the value of the g line (435.84 nm).
  • the solid line shows the value of the sagittal image plane of the d line
  • the broken line shows the value of the meridional image plane of the d line
  • the distortion shows the value of the d line.
  • the solid line indicates the value of the d line
  • the dotted line indicates the value of the c line
  • the alternate long and short dash line indicates the value of the g line.
  • the zoom lens 4 is designed to be lightweight while realizing a high-quality telephoto zoom lens.
  • Table 19 shows the values of the conditional expressions (1) to (5) in the numerical examples 1 to 4 of the zoom lenses 1 to 4.
  • the zoom lenses 1 to 4 are designed to satisfy the conditional expressions (1) to (5).
  • the zoom lens has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens group is changed.
  • the second lens group and the third lens group are fixed at the time of magnification and are moved at the time of magnification change, and the first lens group is composed of four or less lenses and satisfies the following conditional equations (1) and (2). ..
  • f1 Focal length of the first lens group
  • f2 Focal length of the second lens group
  • m2 Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end
  • m3 At the time of scaling from the wide-angle end to the telephoto end It is the amount of movement of the third lens group in.
  • a lens having a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens group has four or less lenses.
  • the weight of the optical system can be reduced by being configured and fixed at the time of magnification change, and by moving the second lens group and the third lens group at the time of magnification change. Further, although the number of the first lens group is small, the total refractive power is increased and good aberration correction can be performed by making the second lens group a positive lens group.
  • the zoom lens when the zoom lens satisfies the condition equation (1), the refractive power of the first lens group is optimized, the diameter of the optical system can be reduced, and various aberrations, particularly spherical aberration, can be achieved. , Axial chromatic aberration and lateral chromatic aberration can be satisfactorily corrected.
  • the zoom lens when the zoom lens satisfies the condition equation (2), the diameter of the light beam incident on the second lens group at the telephoto end becomes smaller and the magnification effect at the time of zooming by the second lens group becomes smaller. Therefore, it is possible to reduce the diameter and increase the magnification of the optical system.
  • the image pickup device of the present technology it is possible to provide an image pickup device provided with a zoom lens that is lightweight and has satisfactorily corrected various aberrations.
  • FIG. 73 shows a block diagram of a digital still camera according to an embodiment of the imaging device of the present technology.
  • the image pickup device (digital still camera) 100 includes an image pickup element 10 having a photoelectric conversion function for converting captured light into an electric signal, and a camera signal processing unit that performs signal processing such as analog-digital conversion of the captured image signal. 20 and an image processing unit 30 that performs recording / reproduction processing of an image signal. Further, the image pickup device 100 includes a display unit 40 for displaying a captured image and the like, an R / W (reader / writer) 50 for writing and reading an image signal to the memory 90, and the entire image pickup device 100.
  • a CPU Central Processing Unit
  • an input unit 70 such as various switches for which a user performs a required operation
  • a zoom lens 1 including a zoom lens 2, a zoom lens 3 and a zoom lens 4
  • a lens drive control unit 80 for controlling the above.
  • the camera signal processing unit 20 performs various signal processing such as conversion of the output signal from the image pickup element 10 into a digital signal, noise removal, image quality correction, and conversion into a brightness / color difference signal.
  • the image processing unit 30 performs compression coding / decompression decoding processing of an image signal based on a predetermined image data format, conversion processing of data specifications such as resolution, and the like.
  • the display unit 40 has a function of displaying various data such as an operation state of the user's input unit 70 and a captured image.
  • the R / W 50 writes the image data encoded by the image processing unit 30 to the memory 90 and reads the image data recorded in the memory 90.
  • the CPU 60 functions as a control processing unit that controls each circuit block provided in the image pickup apparatus 100, and controls each circuit block based on an instruction input signal or the like from the input unit 70.
  • the input unit 70 outputs an instruction input signal according to the operation by the user to the CPU 60.
  • the lens drive control unit 80 controls a motor or the like (not shown) that drives a lens group based on a control signal from the CPU 60.
  • the memory 90 is, for example, a semiconductor memory that can be attached to and detached from the slot connected to the R / W 50.
  • the memory 90 is not detachable from the slot and may be incorporated inside the image pickup apparatus 100.
  • the shot image signal is output to the display unit 40 via the camera signal processing unit 20 and displayed as a camera-through image.
  • the shot image signal is output from the camera signal processing unit 20 to the image processing unit 30, compressed and encoded, and converted into digital data in a predetermined data format. Will be done.
  • the converted data is output to the R / W 50 and written to the memory 90.
  • Focusing is performed by the lens drive control unit 80 moving the focus lens group based on the control signal from the CPU 60.
  • the R / W 50 reads out the predetermined image data from the memory 90 in response to the operation on the input unit 70, and the image processing unit 30 performs the decompression / decoding process. After that, the reproduced image signal is output to the display unit 40 and the reproduced image is displayed.
  • imaging means converting the photoelectric conversion process of converting the light captured by the image pickup element 10 into an electric signal to the digital signal of the output signal from the image pickup element 10 by the camera signal processing unit 20.
  • imaging may refer only to the photoelectric conversion process for converting the light captured by the imaging element 10 into an electric signal, and from the photoelectric conversion process for converting the light captured by the imaging element 10 into an electric signal. It may also refer to processing such as conversion of the output signal from the image pickup element 10 by the camera signal processing unit 20 into a digital signal, noise removal, image quality correction, and conversion into a brightness / color difference signal, and is captured by the image pickup element 10.
  • the camera signal processing unit 20 converts the output signal from the image pickup element 10 into a digital signal, noise removal, image quality correction, conversion into a brightness / color difference signal, and the like.
  • the photoelectric conversion process of converting to It may be pointed out through compression coding / decompression decoding processing of an image signal based on a predetermined image data format, conversion processing of data specifications such as resolution, and writing processing of an image signal to the memory 90 by the R / W 50. You may point. In the above processing, the order of each processing may be changed as appropriate.
  • the image pickup device 100 may be configured to include only a part or all of the image pickup element 10, the camera signal processing section 20, the image processing section 30, and the R / W 50 that perform the above processing. ..
  • the lens configuration of the zoom lens of the present technology is substantially a 6- or 7-group lens configuration of the 1st lens group G1 to the 6th lens group G6 or the 1st lens group G1 to the 7th lens group G7. ..
  • the image pickup device is applied to a digital still camera
  • the scope of application of the image pickup device is not limited to the digital still camera, and a digital video camera, a mobile phone having a built-in camera, etc. It can be widely applied as a camera unit of a digital input / output device in a mobile terminal.
  • the first lens group has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side.
  • the first lens group is fixed at the time of magnification change, and the second lens group and the third lens group are moved at the time of magnification change.
  • the first lens group is composed of four or less lenses.
  • a zoom lens that satisfies the following conditional expression (1) and conditional expression (2).
  • f1 Focal length of the first lens group
  • f2 Focal length of the second lens group
  • m2 Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end
  • m3 From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
  • ⁇ 2> The zoom lens according to ⁇ 1>, which satisfies the following conditional expression (3). (3) -5.0 ⁇ f1 / f23w ⁇ -1.0 However, f23w: The combined focal length at the wide-angle end of the second lens group and the third lens group.
  • ⁇ 3> The zoom lens according to ⁇ 1> or ⁇ 2>, which satisfies the following conditional expression (4). (4) 0.35 ⁇ f1 / ft ⁇ 1.20
  • ft The focal length of the entire system at the telephoto end.
  • ⁇ 4> The zoom lens according to any one of ⁇ 1> to ⁇ 3>, which satisfies the following conditional expression (5).
  • d1t Distance between the first lens group and the second lens group at the telephoto end
  • d2t The distance between the second lens group and the third lens group at the telephoto end.
  • ⁇ 5> The zoom lens according to any one of ⁇ 1> to ⁇ 4>, which focuses by moving all or a part of a group located on the image side of the third lens group in the optical axis direction.
  • ⁇ 6> It includes a zoom lens and an image pickup device that converts an optical image formed by the zoom lens into an electrical signal.
  • the zoom lens is It has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side.
  • the first lens group is fixed at the time of magnification change, and the second lens group and the third lens group are moved at the time of magnification change.
  • the first lens group is composed of four or less lenses.
  • An imaging device that satisfies the following conditional expression (1) and conditional expression (2).
  • f1 Focal length of the first lens group
  • f2 Focal length of the second lens group
  • m2 Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end
  • m3 From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.

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Abstract

The present invention has a positive first lens group, a positive second lens group, and a negative third lens group that are disposed in that order from the object side to the image side. The first lens group is fixed when varying magnification, and the second and third lens groups are moved when varying magnification. The first lens group is constituted by four or fewer lenses, thereby satisfying the following conditional equations (1) and (2). (1) 1.00<f2/f1<11.00 (2) 0.57<m2/m3<0.95, where f1 is the focal length of the first lens group, f2 is the focal length of the second lens group, m2 is the amount of movement of the second lens group when varying magnification from the wide-angle end to the telephoto end, and m3 is the amount of movement of the third lens group when varying magnification from the wide-angle end to the telephoto end.

Description

ズームレンズ及び撮像装置Zoom lens and imaging device
　本技術は、複数のレンズ群を有するズームレンズ及びこのようなズームレンズが用いられる撮像装置の技術分野に関する。 The present technology relates to a technical field of a zoom lens having a plurality of lens groups and an image pickup apparatus in which such a zoom lens is used.
　スチルカメラやビデオカメラ等の撮像装置に用いられる撮影光学系には、用途に応じて様々な焦点距離や口径の光学系が要望されている。例えば、遠くの被写体を所望の画角で拡大して撮影できる望遠ズームレンズに対しては、高画質で小型軽量であり、高ズーム比で迅速なフォーカシングができること等が要求されている。 Optical systems with various focal lengths and diameters are required for photographing optical systems used in imaging devices such as still cameras and video cameras. For example, a telephoto zoom lens capable of magnifying a distant subject at a desired angle of view is required to have high image quality, small size and light weight, and to be able to perform quick focusing at a high zoom ratio.
　これらの要求を満足するズームレンズとして、最も物体側に正の屈折力を有するレンズ群が配置されたポジティブリード型のズームレンズが知られている（例えば、特許文献１及び特許文献２参照）。 As a zoom lens that satisfies these requirements, a positive lead type zoom lens in which a lens group having the most positive refractive power is arranged on the object side is known (see, for example, Patent Document 1 and Patent Document 2).
特開２０１３－２３８８２７号公報Japanese Unexamined Patent Publication No. 2013-238827 特開２０１９－１２０７７３号公報Japanese Unexamined Patent Publication No. 2019-127073
　しかしながら、望遠ズームレンズの高画質化のためには軸上色収差や倍率色収差と言った色収差の補正が重要になる。 However, in order to improve the image quality of the telephoto zoom lens, it is important to correct chromatic aberration such as axial chromatic aberration and Magnification chromatic aberration.
　最も効果的に色収差の補正が可能な手法としては、軸上光束径と軸外光束径がともに高い位置を通過する最も物体側に位置する群に異常部分分散ガラスを用いて色収差の補正に活用する手法がある。 The most effective method for correcting chromatic aberration is to use anomalous partially dispersed glass in the group located closest to the object that passes through a position where both the on-axis luminous flux diameter and the off-axis luminous flux diameter are high, and use it to correct chromatic aberration. There is a method to do.
　一方、望遠ズームレンズの高画質化のためには球面収差やコマ収差を良好に補正することも重要であるが、異常部分分散ガラスは屈折率が低い傾向にある。従って、収差の補正のためには多くのレンズの枚数が必要であり、レンズの枚数が多くなるため重量化を来すおそれがある。 On the other hand, it is important to satisfactorily correct spherical aberration and coma in order to improve the image quality of the telephoto zoom lens, but the abnormal partially dispersed glass tends to have a low refractive index. Therefore, a large number of lenses is required to correct the aberration, and the number of lenses is large, which may result in weight increase.
　そこで、本技術ズームレンズ及び撮像装置は、軽量でありながら諸収差を良好に補正したズームレンズ及びこれを備えた撮像装置を提供することを目的とする。 Therefore, it is an object of the present technology zoom lens and an image pickup apparatus to provide a zoom lens which is lightweight and has satisfactorily corrected various aberrations, and an image pickup apparatus equipped with the same.
　第１に、本技術に係るズームレンズは、物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、前記第１レンズ群は変倍時に固定され前記第２レンズ群と前記第３レンズ群は変倍時に移動され、前記第１レンズ群は４枚以下のレンズによって構成され、以下の条件式（１）及び条件式（２）を満足するものである。
（１）１．００<ｆ２／ｆ１<１１．００
（２）０．５７<ｍ２／ｍ３<０．９５
　但し、
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
ｍ２：広角端から望遠端までの変倍時における前記第２レンズ群の移動量
ｍ３：広角端から望遠端までの変倍時における前記第３レンズ群の移動量
とする。 First, the zoom lens according to the present technology has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens The group is fixed at the time of magnification change, the second lens group and the third lens group are moved at the time of magnification change, and the first lens group is composed of four or less lenses. It satisfies (2).
(1) 1.00 <f2 / f1 <11.00
(2) 0.57 <m2 / m3 <0.95
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group m2: Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end m3: From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
　これにより、第１レンズ群と第２レンズ群の合計の屈折力が大きくなると共に第１レンズ群の屈折力が適正化され、また、望遠端における第２レンズ群に入射する光線の径が小さくなると共に第２レンズ群によるズーミング時の減倍効果が抑制される。 As a result, the total refractive power of the first lens group and the second lens group is increased, the refractive power of the first lens group is optimized, and the diameter of the light beam incident on the second lens group at the telephoto end is reduced. At the same time, the magnification reduction effect during zooming by the second lens group is suppressed.
　第２に、上記した本技術に係るズームレンズにおいては、以下の条件式（３）を満足することが望ましい。
（３）－５．０<ｆ１／ｆ２３ｗ<－１．０
但し、
ｆ２３ｗ：前記第２レンズ群と前記第３レンズ群の広角端における合成焦点距離
とする。 Secondly, in the zoom lens according to the present technology described above, it is desirable that the following conditional expression (3) is satisfied.
(3) -5.0 <f1 / f23w <-1.0
However,
f23w: The combined focal length at the wide-angle end of the second lens group and the third lens group.
　これにより、第１レンズ群の屈折力が適正化される。 As a result, the refractive power of the first lens group is optimized.
　第３に、上記した本技術に係るズームレンズにおいては、以下の条件式（４）を満足することが望ましい。
（４）０．３５<ｆ１／ｆｔ<１．２０
但し、
ｆｔ：望遠端における全系の焦点距離
とする。 Thirdly, in the zoom lens according to the present technology described above, it is desirable that the following conditional expression (4) is satisfied.
(4) 0.35 <f1 / ft <1.20
However,
ft: The focal length of the entire system at the telephoto end.
　これにより、第１レンズ群の屈折力が適正化される。 As a result, the refractive power of the first lens group is optimized.
　第４に、上記した本技術に係るズームレンズにおいては、以下の条件式（５）を満足することが望ましい。
（５）２．１<ｄ１ｔ／ｄ２ｔ<９．９
但し、
ｄ１ｔ：望遠端における前記第１レンズ群と前記第２レンズ群の間隔
ｄ２ｔ：望遠端における前記第２レンズ群と前記第３レンズ群の間隔
とする。 Fourth, in the zoom lens according to the present technology described above, it is desirable that the following conditional expression (5) is satisfied.
(5) 2.1 <d1t / d2t <9.9
However,
d1t: Distance between the first lens group and the second lens group at the telephoto end d2t: The distance between the second lens group and the third lens group at the telephoto end.
　これにより、望遠端における第２レンズ群に入射する光線の径が小さくなると共に第２レンズ群によるズーミング時の減倍効果が抑制される。 As a result, the diameter of the light beam incident on the second lens group at the telephoto end becomes smaller, and the magnification reduction effect during zooming by the second lens group is suppressed.
　第５に、上記した本技術に係るズームレンズにおいては、前記第３レンズ群より像側に位置する群の全体又は一部を光軸方向へ移動させることによりフォーカシングすることが望ましい。 Fifth, in the zoom lens according to the present technology described above, it is desirable to focus by moving all or a part of the group located on the image side of the third lens group in the optical axis direction.
　これにより、全系に対する体積が小さく重量の小さい群又はその一部によってフォーカシングが行われる。 As a result, focusing is performed by a group having a small volume and a small weight with respect to the whole system or a part thereof.
　第６に、本技術に係る撮像装置は、ズームレンズと前記ズームレンズによって形成された光学像を電気的信号に変換する撮像素子とを備え、前記ズームレンズは、物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、前記第１レンズ群は変倍時に固定され前記第２レンズ群と前記第３レンズ群は変倍時に移動され、前記第１レンズ群は４枚以下のレンズによって構成され、以下の条件式（１）及び条件式（２）を満足するものである。
（１）１．００<ｆ２／ｆ１<１１．００
（２）０．５７<ｍ２／ｍ３<０．９５
　但し、
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
ｍ２：広角端から望遠端までの変倍時における前記第２レンズ群の移動量
ｍ３：広角端から望遠端までの変倍時における前記第３レンズ群の移動量
とする。 Sixth, the imaging device according to the present technology includes a zoom lens and an imaging element that converts an optical image formed by the zoom lens into an electrical signal, and the zoom lenses are arranged in order from the object side to the image side. It has a positive first lens group, a positive second lens group, and a negative third lens group, the first lens group is fixed at the time of magnification change, and the second lens group and the third lens group are changed. It is moved at the time of magnification, and the first lens group is composed of four or less lenses, and satisfies the following conditional equations (1) and (2).
(1) 1.00 <f2 / f1 <11.00
(2) 0.57 <m2 / m3 <0.95
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group m2: Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end m3: From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
　これにより、ズームレンズにおいて、第１レンズ群と第２レンズ群の合計の屈折力が大きくなると共に第１レンズ群の屈折力が適正化され、また、望遠端における第２レンズ群に入射する光線の径が小さくなると共に第２レンズ群によるズーミング時の減倍効果が抑制される。 As a result, in the zoom lens, the total refractive power of the first lens group and the second lens group is increased, the refractive power of the first lens group is optimized, and the light beam incident on the second lens group at the telephoto end is increased. As the diameter of the lens becomes smaller, the magnification reduction effect during zooming by the second lens group is suppressed.
図２乃至図７３と共に本技術ズームレンズ及び撮像装置の実施の形態を示すものであり、本図は、ズームレンズの第１の実施の形態の無限遠における広角端のレンズ構成を示す図である。Along with FIGS. 2 to 73, an embodiment of the zoom lens and the image pickup apparatus of the present technology is shown, and this figure is a diagram showing a lens configuration at a wide-angle end at infinity according to the first embodiment of the zoom lens. .. ズームレンズの第１の実施の形態の最至近における広角端のレンズ構成を示す図である。It is a figure which shows the lens structure of the wide-angle end in the nearest vicinity of the 1st Embodiment of a zoom lens. ズームレンズの第１の実施の形態の無限遠における中間焦点距離のレンズ構成を示す図である。It is a figure which shows the lens structure of the intermediate focal length at infinity of the 1st Embodiment of a zoom lens. ズームレンズの第１の実施の形態の最至近における中間焦点距離のレンズ構成を示す図である。It is a figure which shows the lens structure of the intermediate focal length in the nearest vicinity of the 1st Embodiment of a zoom lens. ズームレンズの第１の実施の形態の無限遠における望遠端のレンズ構成を示す図である。It is a figure which shows the lens composition of the telephoto end at infinity of the 1st Embodiment of a zoom lens. ズームレンズの第１の実施の形態の最至近における望遠端のレンズ構成を示す図である。It is a figure which shows the lens structure of the telephoto end in the nearest vicinity of the 1st Embodiment of a zoom lens. 第１の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における広角端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion at the wide-angle end at infinity. 第１の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における広角端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure which shows the spherical aberration, astigmatism, and distortion at the wide-angle end in the nearest vicinity. 第１の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における中間焦点距離の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the intermediate focal length at infinity. 第１の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における中間焦点距離の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the nearest intermediate focal length. 第１の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における望遠端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion at the telephoto end at infinity. 第１の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における望遠端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the telephoto end at the nearest telephoto end. 第１の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における広角端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure of the wide-angle end at infinity. 第１の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における広角端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure of the wide-angle end at the nearest. 第１の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における中間焦点距離の図である。It is a lateral aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure of the intermediate focal length at infinity. 第１の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における中間焦点距離の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure of the intermediate focal length at the nearest. 第１の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における望遠端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure of the telephoto end at infinity. 第１の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における望遠端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 1st Embodiment, and is the figure of the telephoto end at the nearest. ズームレンズの第２の実施の形態の無限遠における広角端のレンズ構成を示す図である。It is a figure which shows the lens structure of the wide-angle end at infinity of the 2nd Embodiment of a zoom lens. ズームレンズの第２の実施の形態の最至近における広角端のレンズ構成を示す図である。It is a figure which shows the lens structure of the wide-angle end in the nearest vicinity of the 2nd Embodiment of a zoom lens. ズームレンズの第２の実施の形態の無限遠における中間焦点距離のレンズ構成を示す図である。It is a figure which shows the lens structure of the intermediate focal length at infinity of the 2nd Embodiment of a zoom lens. ズームレンズの第２の実施の形態の最至近における中間焦点距離のレンズ構成を示す図である。It is a figure which shows the lens structure of the intermediate focal length in the nearest vicinity of the 2nd Embodiment of a zoom lens. ズームレンズの第２の実施の形態の無限遠における望遠端のレンズ構成を示す図である。It is a figure which shows the lens composition of the telephoto end at infinity of the 2nd Embodiment of a zoom lens. ズームレンズの第２の実施の形態の最至近における望遠端のレンズ構成を示す図である。It is a figure which shows the lens composition of the telephoto end in the nearest vicinity of the 2nd Embodiment of a zoom lens. 第２の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における広角端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion at the wide-angle end at infinity. 第２の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における広角端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure which shows the spherical aberration, astigmatism, and distortion at the wide-angle end in the nearest vicinity. 第２の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における中間焦点距離の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the intermediate focal length at infinity. 第２の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における中間焦点距離の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the nearest intermediate focal length. 第２の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における望遠端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion at the telephoto end at infinity. 第２の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における望遠端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the telephoto end at the nearest telephoto end. 第２の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における広角端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure of the wide-angle end at infinity. 第２の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における広角端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure of the wide-angle end at the nearest. 第２の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における中間焦点距離の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure of the intermediate focal length at infinity. 第２の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における中間焦点距離の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure of the intermediate focal length at the nearest. 第２の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における望遠端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure of the telephoto end at infinity. 第２の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における望遠端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 2nd Embodiment, and is the figure of the telephoto end at the nearest. ズームレンズの第３の実施の形態の無限遠における広角端のレンズ構成を示す図である。It is a figure which shows the lens structure of the wide-angle end at infinity of the 3rd Embodiment of a zoom lens. ズームレンズの第３の実施の形態の最至近における広角端のレンズ構成を示す図である。It is a figure which shows the lens structure of the wide-angle end in the nearest vicinity of the 3rd Embodiment of a zoom lens. ズームレンズの第３の実施の形態の無限遠における中間焦点距離のレンズ構成を示す図である。It is a figure which shows the lens structure of the intermediate focal length at infinity of the 3rd Embodiment of a zoom lens. ズームレンズの第３の実施の形態の最至近における中間焦点距離のレンズ構成を示す図である。It is a figure which shows the lens structure of the intermediate focal length in the closest vicinity of the 3rd Embodiment of a zoom lens. ズームレンズの第３の実施の形態の無限遠における望遠端のレンズ構成を示す図である。It is a figure which shows the lens composition of the telephoto end at infinity of the 3rd Embodiment of a zoom lens. ズームレンズの第３の実施の形態の最至近における望遠端のレンズ構成を示す図である。It is a figure which shows the lens composition of the telephoto end in the nearest vicinity of the 3rd Embodiment of a zoom lens. 第３の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における広角端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion at the wide-angle end at infinity. 第３の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における広角端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure which shows the spherical aberration, astigmatism, and distortion at the wide-angle end in the nearest vicinity. 第３の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における中間焦点距離の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the intermediate focal length at infinity. 第３の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における中間焦点距離の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the nearest intermediate focal length. 第３の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における望遠端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion at the telephoto end at infinity. 第３の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における望遠端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the telephoto end at the nearest telephoto end. 第３の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における広角端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure of the wide-angle end at infinity. 第３の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における広角端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure of the wide-angle end at the nearest. 第３の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における中間焦点距離の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure of the intermediate focal length at infinity. 第３の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における中間焦点距離の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure of the intermediate focal length at the nearest. 第３の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における望遠端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure of the telephoto end at infinity. 第３の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における望遠端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 3rd Embodiment, and is the figure of the telephoto end at the nearest. ズームレンズの第４の実施の形態の無限遠における広角端のレンズ構成を示す図である。It is a figure which shows the lens structure of the wide-angle end at infinity of the 4th Embodiment of a zoom lens. ズームレンズの第４の実施の形態の最至近における広角端のレンズ構成を示す図である。It is a figure which shows the lens structure of the wide-angle end in the nearest vicinity of the 4th Embodiment of a zoom lens. ズームレンズの第４の実施の形態の無限遠における中間焦点距離のレンズ構成を示す図である。It is a figure which shows the lens structure of the intermediate focal length at infinity of the 4th Embodiment of a zoom lens. ズームレンズの第４の実施の形態の最至近における中間焦点距離のレンズ構成を示す図である。It is a figure which shows the lens structure of the intermediate focal length in the nearest vicinity of the 4th Embodiment of a zoom lens. ズームレンズの第４の実施の形態の無限遠における望遠端のレンズ構成を示す図である。It is a figure which shows the lens composition of the telephoto end at infinity of the 4th Embodiment of a zoom lens. ズームレンズの第４の実施の形態の最至近における望遠端のレンズ構成を示す図である。It is a figure which shows the lens composition of the telephoto end in the nearest vicinity of the 4th Embodiment of a zoom lens. 第４の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における広角端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion at the wide-angle end at infinity. 第４の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における広角端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion at the wide-angle end in the nearest vicinity. 第４の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における中間焦点距離の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the intermediate focal length at infinity. 第４の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における中間焦点距離の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the nearest intermediate focal length. 第４の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、無限遠における望遠端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion at the telephoto end at infinity. 第４の実施の形態に具体的な数値を適用した数値実施例における縦収差図であり、最至近における望遠端の球面収差、非点収差及び歪曲収差を示す図である。It is a longitudinal aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure which shows the spherical aberration, astigmatism and distortion of the telephoto end at the nearest telephoto end. 第４の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における広角端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure of the wide-angle end at infinity. 第４の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における広角端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure of the wide-angle end at the nearest. 第４の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における中間焦点距離の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure of the intermediate focal length at infinity. 第４の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における中間焦点距離の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure of the intermediate focal length at the nearest. 第４の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、無限遠における望遠端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure of the telephoto end at infinity. 第４の実施の形態に具体的な数値を適用した数値実施例における横収差図であり、最至近における望遠端の図である。It is the lateral aberration diagram in the numerical example which applied the specific numerical value to the 4th Embodiment, and is the figure of the telephoto end at the nearest. 撮像装置の一例を示すブロック図である。It is a block diagram which shows an example of an image pickup apparatus.
　以下に、本技術ズームレンズ及び撮像装置を実施するための形態について説明する。 Hereinafter, a mode for implementing the present technology zoom lens and an imaging device will be described.
　［ズームレンズの構成］
　本技術ズームレンズは、物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、前記第１レンズ群は変倍時に固定され前記第２レンズ群と第３レンズ群は変倍時に移動され、前記第１レンズ群は４枚以下のレンズによって構成され、以下の条件式（１）及び条件式（２）を満足する。
（１）１．００<ｆ２／ｆ１<１１．００
（２）０．５７<ｍ２／ｍ３<０．９５
　但し、
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
ｍ２：広角端から望遠端までの変倍時における前記第２レンズ群の移動量
ｍ３：広角端から望遠端までの変倍時における前記第３レンズ群の移動量
とする。 [Zoom lens configuration]
The zoom lens of the present technology has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens group is fixed at the time of magnification change. The second lens group and the third lens group are moved at the time of magnification change, and the first lens group is composed of four or less lenses, and satisfies the following conditional equations (1) and (2).
(1) 1.00 <f2 / f1 <11.00
(2) 0.57 <m2 / m3 <0.95
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group m2: Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end m3: From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
　上記のように、物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、第１レンズ群が４枚以下のレンズによって構成されて変倍時に固定され、第２レンズ群と第３レンズ群が変倍時に移動されることにより、光学系の軽量化を図ることが可能になる。また、第１レンズ群が少ない枚数の構成にされているが、第２レンズ群を正レンズ群にすることにより第１レンズ群と第２レンズ群の合計の屈折力を大きくすると共に良好な収差補正ができるようにしている。 As described above, a lens having a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens group has four or less lenses. The weight of the optical system can be reduced by being configured and fixed at the time of magnification change, and by moving the second lens group and the third lens group at the time of magnification change. Further, although the number of the first lens group is small, by making the second lens group a positive lens group, the total refractive power of the first lens group and the second lens group is increased and good aberration is obtained. It is possible to make corrections.
　条件式（１）は、光学系の良好な収差補正を行いながら軽量化を達成するための式であり、第１レンズ群の焦点距離と第２レンズ群の焦点距離の適正化を図る条件式である。 The conditional equation (1) is an equation for achieving weight reduction while performing good aberration correction of the optical system, and is a conditional equation for optimizing the focal length of the first lens group and the focal length of the second lens group. Is.
　条件式（１）の下限値を下回ると、第１レンズ群の屈折力が弱まり第２レンズ群に入射する光線の径が大きくなるため光学系の小径化が困難になる。 If it falls below the lower limit of the conditional expression (1), the refractive power of the first lens group weakens and the diameter of the light beam incident on the second lens group becomes large, which makes it difficult to reduce the diameter of the optical system.
　一方、条件式（１）の上限値を上回ると、第１レンズ群の屈折力が強まり諸収差、特に、球面収差、軸上色収差、倍率色収差の補正が困難になる。 On the other hand, if the upper limit of the conditional expression (1) is exceeded, the refractive power of the first lens group becomes stronger, and it becomes difficult to correct various aberrations, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification.
　従って、ズームレンズが条件式（１）を満足することにより、第１レンズ群の屈折力が適正化され、光学系の小径化を図ることができると共に諸収差、特に、球面収差、軸上色収差及び倍率色収差を良好に補正することができる。 Therefore, when the zoom lens satisfies the conditional equation (1), the refractive power of the first lens group is optimized, the diameter of the optical system can be reduced, and various aberrations, particularly spherical aberration and axial chromatic aberration, can be achieved. And the chromatic aberration of magnification can be satisfactorily corrected.
　尚、条件式（１）の範囲を以下の条件式（１Ａ）の範囲に設定することが可能である。
（１Ａ）１．０８<ｆ２／ｆ１<１０．１０
　条件式（１）の範囲を条件式（１Ａ）の範囲に設定することにより、上記した効果を一層高めることができる。 The range of the conditional expression (1) can be set to the range of the following conditional expression (1A).
(1A) 1.08 <f2 / f1 <10.10
By setting the range of the conditional expression (1) to the range of the conditional expression (1A), the above-mentioned effect can be further enhanced.
　また、条件式（１）の範囲を以下の条件式（１Ｂ）の範囲に設定することが可能である。
（１Ｂ）１．０８<ｆ２／ｆ１<８．０
　条件式（１）の範囲を条件式（１Ｂ）の範囲に設定することにより、上記した効果をより一層高めることができる。 Further, the range of the conditional expression (1) can be set to the range of the following conditional expression (1B).
(1B) 1.08 <f2 / f1 <8.0
By setting the range of the conditional expression (1) to the range of the conditional expression (1B), the above-mentioned effect can be further enhanced.
　さらに、条件式（１）の範囲を以下の条件式（１Ｃ）の範囲に設定することが可能である。
（１Ｃ）１．０８<ｆ２／ｆ１<６．０
　条件式（１）の範囲を条件式（１Ｃ）の範囲に設定することにより、上記した効果をさらに一層高めることができる。 Further, the range of the conditional expression (1) can be set to the range of the following conditional expression (1C).
(1C) 1.08 <f2 / f1 <6.0
By setting the range of the conditional expression (1) to the range of the conditional expression (1C), the above-mentioned effect can be further enhanced.
　さらにまた、条件式（１）の範囲を以下の条件式（１Ｄ）の範囲に設定することが可能である。
（１Ｄ）１．０８<ｆ２／ｆ１<４．０
　条件式（１）の範囲を条件式（１Ｄ）の範囲に設定することにより、上記した効果をさらにより一層高めることができる。 Furthermore, the range of the conditional expression (1) can be set to the range of the following conditional expression (1D).
(1D) 1.08 <f2 / f1 <4.0
By setting the range of the conditional expression (1) to the range of the conditional expression (1D), the above-mentioned effect can be further enhanced.
　加えて、条件式（１）の範囲を以下の条件式（１Ｅ）の範囲に設定することが可能である。
（１Ｅ）１．０８<ｆ２／ｆ１<２．５
　条件式（１）の範囲を条件式（１Ｅ）の範囲に設定することにより、上記した効果をさらにまたより一層高めることができる。 In addition, the range of the conditional expression (1) can be set to the range of the following conditional expression (1E).
(1E) 1.08 <f2 / f1 <2.5
By setting the range of the conditional expression (1) to the range of the conditional expression (1E), the above-mentioned effect can be further enhanced.
　条件式（２）は、第２レンズ群の移動量と第３レンズ群の移動量とを相対的に規定するための条件式である。 Conditional expression (2) is a conditional expression for relatively defining the amount of movement of the second lens group and the amount of movement of the third lens group.
　条件式（２）の下限値を下回ると、望遠端における第２レンズ群に入射する光線の径が大きくなるため光学系の小径化が困難になる。 If it falls below the lower limit of the conditional expression (2), the diameter of the light beam incident on the second lens group at the telephoto end becomes large, which makes it difficult to reduce the diameter of the optical system.
　一方、条件式（２）の上限値を上回ると、第２レンズ群によるズーミング時の減倍効果が大きくなってしまうため高倍率化の達成が困難になる。 On the other hand, if the upper limit of the conditional expression (2) is exceeded, the magnification reduction effect during zooming by the second lens group becomes large, and it becomes difficult to achieve high magnification.
　従って、ズームレンズが条件式（２）を満足することにより、望遠端における第２レンズ群に入射する光線の径が小さくなると共に第２レンズ群によるズーミング時の減倍効果が抑制されるため、光学系の小径化及び高倍率化を図ることができる。 Therefore, when the zoom lens satisfies the condition equation (2), the diameter of the light beam incident on the second lens group at the telephoto end becomes smaller and the magnification reduction effect during zooming by the second lens group is suppressed. It is possible to reduce the diameter and increase the magnification of the optical system.
　尚、条件式（２）の範囲を以下の条件式（２Ａ）の範囲に設定することが可能である。
（２Ａ）０．５９<ｍ２／ｍ３<０．９４
　条件式（２）の範囲を条件式（２Ａ）の範囲に設定することにより、上記した効果を一層高めることができる。 The range of the conditional expression (2) can be set to the range of the following conditional expression (2A).
(2A) 0.59 <m2 / m3 <0.94
By setting the range of the conditional expression (2) to the range of the conditional expression (2A), the above-mentioned effect can be further enhanced.
　以上のように、本技術ズームレンズによれば、軽量でありながら諸収差を良好に補正したズームレンズを提供することができる。 As described above, according to the zoom lens of the present technology, it is possible to provide a zoom lens that is lightweight and has satisfactorily corrected various aberrations.
　［一実施形態によるズームレンズの構成］
　本技術の一実施形態によるズームレンズにあっては、以下の条件式（３）を満足することが望ましい。
（３）－５．０<ｆ１／ｆ２３ｗ<－１．０
但し、
ｆ２３ｗ：第２レンズ群と第３レンズ群の広角端における合成焦点距離
とする。 [Structure of zoom lens according to one embodiment]
It is desirable that the following conditional expression (3) is satisfied for the zoom lens according to the embodiment of the present technology.
(3) -5.0 <f1 / f23w <-1.0
However,
f23w: The combined focal length at the wide-angle end of the second lens group and the third lens group.
　条件式（３）は第１レンズ群の焦点距離を第２レンズ群と第３レンズ群の合成焦点距離に対して相対的に規定するための条件式である。 Conditional formula (3) is a conditional formula for defining the focal length of the first lens group relative to the combined focal length of the second lens group and the third lens group.
　条件式（３）の下限値を下回ると、第１レンズ群の屈折力が強くなり過ぎるため、望遠端における諸収差、特に、球面収差や軸上色収差や倍率色収差の補正が困難になる。 If it falls below the lower limit of the conditional expression (3), the refractive power of the first lens group becomes too strong, and it becomes difficult to correct various aberrations at the telephoto end, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification.
　一方、条件式（３）の上限値を上回ると、第１レンズ群の屈折力が弱くなり過ぎるため、望遠端における第２レンズ群に入射する光線の径が大きくなり光学系の小径化が困難になる。 On the other hand, if the upper limit of the conditional expression (3) is exceeded, the refractive power of the first lens group becomes too weak, so that the diameter of the light beam incident on the second lens group at the telephoto end becomes large and it is difficult to reduce the diameter of the optical system. become.
　従って、ズームレンズが条件式（３）を満足することにより、第１レンズ群の屈折力が適正化され、望遠端における諸収差、特に、球面収差や軸上色収差や倍率色収差の良好な補正を行うことができると共に光学系の小径化を図ることができる。 Therefore, when the zoom lens satisfies the conditional equation (3), the refractive power of the first lens group is optimized, and various aberrations at the telephoto end, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification can be satisfactorily corrected. This can be done and the diameter of the optical system can be reduced.
　尚、条件式（３）の範囲を以下の条件式（３Ａ）の範囲に設定することが可能である。
（３Ａ）－４．２<ｆ１／ｆ２３ｗ<－２．５
　条件式（３）の範囲を条件式（３Ａ）の範囲に設定することにより、上記した効果を一層高めることができる。 The range of the conditional expression (3) can be set to the range of the following conditional expression (3A).
(3A) -4.2 <f1 / f23w <-2.5
By setting the range of the conditional expression (3) to the range of the conditional expression (3A), the above-mentioned effect can be further enhanced.
　本技術の一実施形態によるズームレンズにあっては、以下の条件式（４）を満足することが望ましい。
（４）０．３５<ｆ１／ｆｔ<１．２０
但し、
ｆｔ：望遠端における全系の焦点距離
とする。 It is desirable that the following conditional expression (4) is satisfied in the zoom lens according to the embodiment of the present technology.
(4) 0.35 <f1 / ft <1.20
However,
ft: The focal length of the entire system at the telephoto end.
　条件式（４）は、第１レンズ群の焦点距離を望遠端における光学系の焦点距離に対して相対的に規定するための条件式である。 Conditional expression (4) is a conditional expression for defining the focal length of the first lens group relative to the focal length of the optical system at the telephoto end.
　条件式（４）の下限値を下回ると、第１レンズ群の屈折力が強くなり過ぎるため、望遠端における諸収差、特に、球面収差や軸上色収差や倍率色収差の補正が困難になる。 If it falls below the lower limit of the conditional equation (4), the refractive power of the first lens group becomes too strong, and it becomes difficult to correct various aberrations at the telephoto end, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification.
　一方、条件式（４）の上限値を上回ると、第１レンズ群の屈折力が弱くなり過ぎるため、望遠端における第２レンズ群に入射する光線の径が大きくなり光学系の小径化が困難になる。 On the other hand, if the upper limit of the conditional equation (4) is exceeded, the refractive power of the first lens group becomes too weak, so that the diameter of the light beam incident on the second lens group at the telephoto end becomes large and it is difficult to reduce the diameter of the optical system. become.
　従って、ズームレンズが条件式（４）を満足することにより、第１レンズ群の屈折力が適正化され、望遠端における諸収差、特に、球面収差や軸上色収差や倍率色収差の良好な補正を行うことができると共に光学系の小径化を図ることができる。 Therefore, when the zoom lens satisfies the conditional equation (4), the refractive power of the first lens group is optimized, and various aberrations at the telephoto end, particularly spherical aberration, axial chromatic aberration, and chromatic aberration of magnification can be satisfactorily corrected. This can be done and the diameter of the optical system can be reduced.
　尚、条件式（４）の範囲を以下の条件式（４Ａ）の範囲に設定することが可能である。
（４Ａ）０．４５<ｆ１／ｆｔ<０．８５
　条件式（４）の範囲を条件式（４Ａ）の範囲に設定することにより、上記した効果を一層高めることができる。 The range of the conditional expression (4) can be set to the range of the following conditional expression (4A).
(4A) 0.45 <f1 / ft <0.85
By setting the range of the conditional expression (4) to the range of the conditional expression (4A), the above-mentioned effect can be further enhanced.
　本技術の一実施形態によるズームレンズにあっては、以下の条件式（５）を満足することが望ましい。
（５）２．１<ｄ１ｔ／ｄ２ｔ<９．９
但し、
ｄ１ｔ：望遠端における第１レンズ群と第２レンズ群の間隔
ｄ２ｔ：望遠端における第２レンズ群と第３レンズ群の間隔
とする。 It is desirable that the following conditional expression (5) is satisfied for the zoom lens according to the embodiment of the present technology.
(5) 2.1 <d1t / d2t <9.9
However,
d1t: Distance between the first lens group and the second lens group at the telephoto end d2t: The distance between the second lens group and the third lens group at the telephoto end.
　条件式（５）は、第２レンズ群の移動量と第３レンズ群の移動量を相対的に規定するための条件式である。 Conditional expression (5) is a conditional expression for relatively defining the amount of movement of the second lens group and the amount of movement of the third lens group.
　条件式（５）の下限値を下回ると、望遠端における第２レンズ群に入射する光線の径が大きくなるため、光学系の小径化が困難になる。 If it is less than the lower limit of the conditional expression (5), the diameter of the light beam incident on the second lens group at the telephoto end becomes large, so that it becomes difficult to reduce the diameter of the optical system.
　一方、条件式（５）の上限値を上回ると、第２レンズ群によるズーミング時の減倍効果が大きくなってしまうため、高倍率化の達成が困難になる。 On the other hand, if the upper limit of the conditional expression (5) is exceeded, the magnification reduction effect during zooming by the second lens group becomes large, and it becomes difficult to achieve high magnification.
　従って、ズームレンズが条件式（５）を満足することにより、望遠端における第２レンズ群に入射する光線の径が小さくなると共に第２レンズ群によるズーミング時の減倍効果が抑制されるため、光学系の小径化を図ることができると共に高倍率化を図ることができる。 Therefore, when the zoom lens satisfies the condition equation (5), the diameter of the light beam incident on the second lens group at the telephoto end becomes smaller and the magnification effect during zooming by the second lens group is suppressed. The diameter of the optical system can be reduced and the magnification can be increased.
　尚、条件式（５）の範囲を以下の条件式（５Ａ）の範囲に設定することが可能である。
（５Ａ）３．０<ｄ１ｔ／ｄ２ｔ<７．０
　条件式（５）の範囲を条件式（５Ａ）の範囲に設定することにより、上記した効果を一層高めることができる。 The range of the conditional expression (5) can be set to the range of the following conditional expression (5A).
(5A) 3.0 <d1t / d2t <7.0
By setting the range of the conditional expression (5) to the range of the conditional expression (5A), the above-mentioned effect can be further enhanced.
　本技術の一実施形態によるズームレンズにあっては、第３レンズ群より像側に位置する群の全体又は一部を光軸方向へ移動させることによりフォーカシングすることが望ましい。 In the zoom lens according to the embodiment of the present technology, it is desirable to focus by moving the whole or a part of the group located on the image side of the third lens group in the optical axis direction.
　第３レンズ群より像側に位置する群の全体又は一部を光軸方向へ移動させることにより、全系に対する体積が小さく重量の小さい群又はその一部によってフォーカシングが行われるため、フォーカス駆動の高速化を図ることができる。 By moving all or a part of the group located on the image side of the third lens group in the optical axis direction, focusing is performed by the group having a small volume and a small weight with respect to the whole system or a part thereof. The speed can be increased.
　［ズームレンズの数値実施例］
　以下に、本技術ズームレンズの具体的な実施の形態及び実施の形態に具体的な数値を適用した数値実施例について、図面及び表を参照して説明する。 [Numerical example of zoom lens]
Hereinafter, specific embodiments of the zoom lens of the present technology and numerical examples in which specific numerical values are applied to the embodiments will be described with reference to drawings and tables.
　尚、以下の各表や説明において示した記号の意味等については、下記に示す通りである。 The meanings of the symbols shown in the following tables and explanations are as shown below.
　「ｒ」は第ｉ番目の面の近軸曲率半径、「ｄ」は第ｉ番目の面と第ｉ＋１番目の面の間の軸上面間隔（レンズの中心の厚み又は空気間隔）、「ｎｄ」は第ｉ番目の面から始まるレンズ等のｄ線（λ＝５８７．６ｎｍ）における屈折率、「νｄ」は第ｉ番目の面から始まるレンズ等のｄ線におけるアッベ数を示す。 "R" is the paraxial radius of curvature of the i-th plane, "d" is the axial top-top spacing (thickness of the center of the lens or air spacing) between the i-th plane and the i + 1th plane, "nd" Is the refractive index on the d-line (λ = 587.6 nm) of the lens or the like starting from the i-th plane, and “νd” is the Abbe number on the d-line of the lens or the like starting from the i-th plane.
　「ｒ」に関し「∞」は当該面が平面であることを示す。「ｄ」に関し「可変」とあるのは可変間隔であることを示す。 Regarding "r", "∞" indicates that the surface is a plane. Regarding "d", "variable" indicates that the interval is variable.
　非球面には面番号の右側に＊印を付しており、開口絞りには面番号の右側に「絞り」の記述を付している。 The aspherical surface is marked with * on the right side of the surface number, and the aperture diaphragm is marked with the description of "aperture" on the right side of the surface number.
　「κ」は円錐定数（コーニック定数）、「Ａ４」、「Ａ６」、「Ａ８」、「Ａ１０」、「Ａ１２」はそれぞれ４次、６次、８次、１０次、１２次の非球面係数を示す。 "Κ" is a conical constant (conic constant), "A4", "A6", "A8", "A10", "A12" are 4th, 6th, 8th, 10th, and 12th aspherical coefficients, respectively. Is shown.
　尚、以下の非球面係数を示す各表において、「Ｅ－ｎ」は１０を底とする指数表現、即ち、「１０のマイナスｎ乗」を表しており、例えば、「０．１２３４５Ｅ－０５」は「０．１２３４５×（１０のマイナス五乗）」を表している。 In each table showing the aspherical coefficient below, "En" represents an exponential notation with a base of 10, that is, "10 minus nth power", for example, "0.12345E-05". Represents "0.12345 x (10 minus the fifth power)".
　各実施の形態において用いられたズームレンズには、レンズ面が非球面に形成されたものがある。非球面形状は、「ｘ」をレンズ面の頂点からの光軸方向における距離（サグ量）、「ｙ」を光軸方向に直交する方向における高さ（像高）、「ｃ」をレンズの頂点における近軸曲率（曲率半径の逆数）、「κ」を円錐定数（コーニック定数）、「Ａ４」、「Ａ６」、・・・をそれぞれ４次、６次、・・・の非球面係数とすると、以下の数式１によって定義される。 Some of the zoom lenses used in each embodiment have an aspherical lens surface. For the aspherical shape, "x" is the distance (sag amount) in the optical axis direction from the apex of the lens surface, "y" is the height (image height) in the direction orthogonal to the optical axis direction, and "c" is the lens. Near-axis curvature at the apex (inverse of the radius of curvature), "κ" is the conical constant (conic constant), "A4", "A6", ... are the aspherical coefficients of the 4th, 6th, ... Then, it is defined by the following equation 1.
　各図において、像面は「ＩＭＧ」で示す。 In each figure, the image plane is indicated by "IMG".
Figure JPOXMLDOC01-appb-M000001
Figure JPOXMLDOC01-appb-M000001
　<第１の実施の形態>
　図１乃至図６は、本技術の第１の実施の形態におけるズームレンズ１のレンズ構成を示している。 <First Embodiment>
1 to 6 show the lens configuration of the zoom lens 1 according to the first embodiment of the present technology.
　ズームレンズ１は、物体側より像側へ順に配置された第１レンズ群Ｇ１と第２レンズ群Ｇ２と第３レンズ群Ｇ３と第４レンズ群Ｇ４と第５レンズ群Ｇ５と第６レンズ群Ｇ６を有している。第１レンズ群Ｇ１は正のレンズ群として設けられ、第２レンズ群Ｇ２は正のレンズ群として設けられ、第３レンズ群Ｇ３は負のレンズ群として設けられている。 The zoom lens 1 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6 arranged in order from the object side to the image side. have. The first lens group G1 is provided as a positive lens group, the second lens group G2 is provided as a positive lens group, and the third lens group G3 is provided as a negative lens group.
　第１レンズ群Ｇ１は変倍時に固定され、第２レンズ群Ｇ２と第３レンズ群Ｇ３は変倍時に移動される。 The first lens group G1 is fixed at the time of scaling, and the second lens group G2 and the third lens group G3 are moved at the time of scaling.
　第１レンズ群Ｇ１は、物体側から像側へ順に、物体側に凸面を向けた負メニスカスレンズＬ１１、正レンズＬ１２、物体側に凸面を向けた正メニスカスレンズＬ１３によって構成されている。 The first lens group G1 is composed of a negative meniscus lens L11 having a convex surface facing the object side, a positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side in order from the object side to the image side.
　第２レンズ群Ｇ２は、像側に凸面を向けた正メニスカスレンズＬ２１によって構成されている。 The second lens group G2 is composed of a positive meniscus lens L21 with a convex surface facing the image side.
　第３レンズ群Ｇ３は、物体側から像側へ順に、負レンズＬ３１、正レンズＬ３２、負レンズＬ３３、像側に凸面を向けた負メニスカスレンズＬ３４によって構成されている。正レンズＬ３２と負レンズＬ３３は接合レンズとして構成されている。 The third lens group G3 is composed of a negative lens L31, a positive lens L32, a negative lens L33, and a negative meniscus lens L34 with a convex surface facing the image side, in this order from the object side to the image side. The positive lens L32 and the negative lens L33 are configured as a junction lens.
　第４レンズ群Ｇ４は、物体側から像側へ順に、負レンズＬ４１、物体側に凸面を向けた正メニスカスレンズＬ４２によって構成されている。負レンズＬ４１と正メニスカスレンズＬ４２は接合レンズとして構成されている。 The fourth lens group G4 is composed of a negative lens L41 and a positive meniscus lens L42 with a convex surface facing the object side in order from the object side to the image side. The negative lens L41 and the positive meniscus lens L42 are configured as a junction lens.
　第５レンズ群Ｇ５は、物体側から像側へ順に、正レンズＬ５１、物体側に凸面を向けた負メニスカスレンズＬ５２、正レンズＬ５３によって構成されている。負メニスカスレンズＬ５２と正レンズＬ５３は接合レンズとして構成されている。 The fifth lens group G5 is composed of a positive lens L51, a negative meniscus lens L52 with a convex surface facing the object side, and a positive lens L53 in this order from the object side to the image side. The negative meniscus lens L52 and the positive lens L53 are configured as a junction lens.
　第６レンズ群Ｇ６は、物体側から像側へ順に、像側に凸面を向けた負メニスカスレンズＬ６１、正レンズＬ６２、開口絞りＳ、正レンズＬ６３、負レンズＬ６４、正レンズＬ６５、像側に凸面を向けた正メニスカスレンズＬ６６、負レンズＬ６７、正レンズＬ６８、負レンズＬ６９、正レンズＬ６１０、正レンズＬ６１１、負レンズＬ６１２、像側に凸面を向けた負レンズＬ６１３によって構成されている。正レンズＬ６３と負レンズＬ６４は接合レンズとして構成され、正メニスカスレンズＬ６６と負レンズＬ６７は接合レンズとして構成され、正レンズＬ６８と負レンズＬ６９は接合レンズとして構成され、正レンズＬ６１１と負レンズＬ６１２は接合レンズとして構成されている。 The sixth lens group G6 has a negative meniscus lens L61, a positive lens L62, an aperture aperture S, a positive lens L63, a negative lens L64, a positive lens L65, and an image side in order from the object side to the image side. It is composed of a positive meniscus lens L66 with a convex surface, a negative lens L67, a positive lens L68, a negative lens L69, a positive lens L610, a positive lens L611, a negative lens L612, and a negative lens L613 with a convex surface facing the image side. The positive lens L63 and the negative lens L64 are configured as a junction lens, the positive meniscus lens L66 and the negative lens L67 are configured as a junction lens, the positive lens L68 and the negative lens L69 are configured as a junction lens, and the positive lens L611 and the negative lens L612. Is configured as a junction lens.
　無限遠から近距離へのフォーカシングに際しては、第５レンズ群Ｇ５が光軸方向へ移動される。尚、フォーカシングに際しては、正レンズＬ６１０が光軸方向へ移動される構成等の他の構成にされていてもよい。また、接合レンズを構成する正レンズＬ６６と負レンズＬ６７が光軸方向に直交する方向へ移動されることにより、手振れ等に対して防振を行うことができる。 When focusing from infinity to a short distance, the fifth lens group G5 is moved in the optical axis direction. At the time of focusing, another configuration such as a configuration in which the positive lens L610 is moved in the optical axis direction may be used. Further, by moving the positive lens L66 and the negative lens L67 constituting the bonded lens in the direction orthogonal to the optical axis direction, vibration isolation can be performed against camera shake and the like.
　表１に、ズームレンズ１に具体的数値を適用した数値実施例１のレンズデータを示す。 Table 1 shows the lens data of Numerical Example 1 in which specific numerical values are applied to the zoom lens 1.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　数値実施例１の焦点距離ｆ、ＦナンバーＦｎｏ、半画角ω、像高Ｙ及び光学全長Ｌを表２に示す。 Table 2 shows the focal length f, the F number Fno, the half angle of view ω, the image height Y, and the total optical length L of Numerical Example 1.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　無限遠と最至近（２０００ｍｍ）の間のフォーカシングに際して、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間隔、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間隔、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間隔、第４レンズ群Ｇ４と第５レンズ群Ｇ５の間隔、第５レンズ群Ｇ５と第６レンズ群Ｇ６の間隔が変化する。数値実施例１における各面間隔の無限遠と最至近における可変間隔を表３に示す。 When focusing between infinity and the closest (2000 mm), the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, the third lens group G3 and the fourth The distance between the lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6 change. Numerical values Table 3 shows the infinity and the closest variable spacing of each surface spacing in Example 1.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
　数値実施例１における各レンズ群の焦点距離を表４に示す。 Numerical values Table 4 shows the focal lengths of each lens group in Example 1.
Figure JPOXMLDOC01-appb-T000005
Figure JPOXMLDOC01-appb-T000005
　図７乃至図１２は数値実施例１の縦収差図、図１３乃至図１８は数値実施例１の横収差図である。図７乃至図１２には、球面収差において実線はｄ線（５８７．５６ｎｍ）の値を示し、点線はｃ線（６５６．２７ｎｍ）の値を示し、一点鎖線はｇ線（４３５．８４ｎｍ）の値を示し、非点収差において実線はｄ線のサジタル像面の値を示し、破線はｄ線のメリジオアナル像面の値を示し、歪曲収差においてｄ線の値を示す。図１３乃至図１８において、実線はｄ線の値を示し、点線はｃ線の値を示し、一点鎖線はｇ線の値を示す。 7 to 12 are longitudinal aberration diagrams of Numerical Example 1, and FIGS. 13 to 18 are transverse aberration diagrams of Numerical Example 1. In FIGS. 7 to 12, the solid line shows the value of the d line (587.56 nm), the dotted line shows the value of the c line (656.27 nm), and the alternate long and short dash line shows the value of the g line (435.84 nm). In the astigmatism, the solid line shows the value of the sagittal image plane of the d line, the broken line shows the value of the meridional image plane of the d line, and the distortion shows the value of the d line. In FIGS. 13 to 18, the solid line indicates the value of the d line, the dotted line indicates the value of the c line, and the alternate long and short dash line indicates the value of the g line.
　以上の構成により、ズームレンズ１は高画質な望遠ズームレンズを実現した上で軽量化が図られている。 With the above configuration, the zoom lens 1 is designed to be lightweight while realizing a high-quality telephoto zoom lens.
　また、各収差図から、数値実施例１は諸収差が良好に補正され、優れた結像性能を有していることが明らかである。 Further, from each aberration diagram, it is clear that the numerical embodiment 1 has various aberrations corrected well and has excellent imaging performance.
　<第２の実施の形態>
　図１９乃至図２４は、本技術の第２の実施の形態におけるズームレンズ２のレンズ構成を示している。 <Second embodiment>
19 to 24 show the lens configuration of the zoom lens 2 according to the second embodiment of the present technology.
　ズームレンズ２は、物体側より像側へ順に配置された第１レンズ群Ｇ１と第２レンズ群Ｇ２と第３レンズ群Ｇ３と第４レンズ群Ｇ４と第５レンズ群Ｇ５と第６レンズ群Ｇ６と第７レンズ群Ｇ７を有している。第１レンズ群Ｇ１は正のレンズ群として設けられ、第２レンズ群Ｇ２は正のレンズ群として設けられ、第３レンズ群Ｇ３は負のレンズ群として設けられている。 The zoom lens 2 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6 arranged in order from the object side to the image side. And has a seventh lens group G7. The first lens group G1 is provided as a positive lens group, the second lens group G2 is provided as a positive lens group, and the third lens group G3 is provided as a negative lens group.
　第１レンズ群Ｇ１は変倍時に固定され、第２レンズ群Ｇ２と第３レンズ群Ｇ３は変倍時に移動される。 The first lens group G1 is fixed at the time of scaling, and the second lens group G2 and the third lens group G3 are moved at the time of scaling.
　第１レンズ群Ｇ１は、物体側から像側へ順に、物体側に凸面を向けた負メニスカスレンズＬ１１、正レンズＬ１２、正レンズＬ１３によって構成されている。 The first lens group G1 is composed of a negative meniscus lens L11, a positive lens L12, and a positive lens L13 whose convex surfaces are directed toward the object side in order from the object side to the image side.
　第２レンズ群Ｇ２は、物体側から像側へ順に、物体側に凸面を向けた正メニスカスレンズＬ２１、物体側に凸面を向けた負メニスカスレンズＬ２２によって構成されている。 The second lens group G2 is composed of a positive meniscus lens L21 having a convex surface facing the object side and a negative meniscus lens L22 having a convex surface facing the object side in order from the object side to the image side.
　第３レンズ群Ｇ３は、物体側から像側へ順に、負レンズＬ３１、負レンズＬ３２、正レンズＬ３３によって構成されている。負レンズＬ３２と正レンズＬ３３は接合レンズとして構成されている。 The third lens group G3 is composed of a negative lens L31, a negative lens L32, and a positive lens L33 in this order from the object side to the image side. The negative lens L32 and the positive lens L33 are configured as a junction lens.
　第４レンズ群Ｇ４は、物体側から像側へ順に、正レンズＬ４１、正レンズＬ４２、正レンズＬ４３、負レンズＬ４４によって構成されている。正レンズＬ４３と負レンズＬ４４は接合レンズとして構成されている。 The fourth lens group G4 is composed of a positive lens L41, a positive lens L42, a positive lens L43, and a negative lens L44 in this order from the object side to the image side. The positive lens L43 and the negative lens L44 are configured as a junction lens.
　第５レンズ群Ｇ５は、物体側から像側へ順に、開口絞りＳ、正レンズＬ５１、物体側に凸面を向けた負メニスカスレンズＬ５２、物体側に凸面を向けた負メニスカスレンズＬ５３、物体側に凸面を向けた正メニスカスレンズＬ５４、物体側に凸面を向けた正メニスカスレンズＬ５５、物体側に凸面を向けた負メニスカスレンズＬ５６、物体側に凸面を向けた正メニスカスレンズＬ５７によって構成されている。負メニスカスレンズＬ５３と正メニスカスレンズＬ５４は接合レンズとして構成され、負メニスカスレンズＬ５６と正メニスカスレンズＬ５７は接合レンズとして構成されている。 The fifth lens group G5 includes an aperture aperture S, a positive lens L51, a negative meniscus lens L52 with a convex surface facing the object side, a negative meniscus lens L53 with a convex surface facing the object side, and an object side in order from the object side to the image side. It is composed of a positive meniscus lens L54 with a convex surface, a positive meniscus lens L55 with a convex surface on the object side, a negative meniscus lens L56 with a convex surface on the object side, and a positive meniscus lens L57 with a convex surface on the object side. The negative meniscus lens L53 and the positive meniscus lens L54 are configured as a junction lens, and the negative meniscus lens L56 and the positive meniscus lens L57 are configured as a junction lens.
　第６レンズ群Ｇ６は、物体側から像側へ順に、物体側に凸面を向けた負メニスカスレンズＬ６１、負レンズＬ６２、正レンズＬ６３によって構成されている。負レンズＬ６２と正レンズＬ６３は接合レンズとして構成されている。 The sixth lens group G6 is composed of a negative meniscus lens L61, a negative lens L62, and a positive lens L63 whose convex surfaces are directed toward the object side in order from the object side to the image side. The negative lens L62 and the positive lens L63 are configured as a junction lens.
　第７レンズ群Ｇ７は、物体側から像側へ順に、物体側に凸面を向けた正メニスカスレンズＬ７１、像側に凸面を向けた正メニスカスレンズＬ７２、像側に凸面を向けた負メニスカスレンズＬ７３によって構成されている。 The seventh lens group G7 includes a positive meniscus lens L71 having a convex surface facing the object side, a positive meniscus lens L72 having a convex surface facing the image side, and a negative meniscus lens L73 having a convex surface facing the image side in order from the object side to the image side. It is composed of.
　無限遠から近距離へのフォーカシングに際しては、第６レンズ群Ｇ６が光軸方向へ移動される。尚、フォーカシングに際しては、第４レンズ群Ｇ４が光軸方向へ移動される等の他の構成にされていてもよい。また、接合レンズを構成する負メニスカスレンズＬ５３と正メニスカスレンズＬ５４が光軸方向に直交する方向へ移動されることにより、手振れ等に対して防振を行うことができる。 When focusing from infinity to a short distance, the 6th lens group G6 is moved in the optical axis direction. At the time of focusing, the fourth lens group G4 may have another configuration such as being moved in the optical axis direction. Further, by moving the negative meniscus lens L53 and the positive meniscus lens L54 constituting the bonded lens in the direction orthogonal to the optical axis direction, vibration isolation can be performed against camera shake and the like.
　表５に、ズームレンズ２に具体的数値を適用した数値実施例２のレンズデータを示す。 Table 5 shows the lens data of Numerical Example 2 in which specific numerical values are applied to the zoom lens 2.
Figure JPOXMLDOC01-appb-T000006
Figure JPOXMLDOC01-appb-T000006
　数値実施例２の焦点距離ｆ、ＦナンバーＦｎｏ、半画角ω、像高Ｙ及び光学全長Ｌを表６に示す。 Table 6 shows the focal length f, the F number Fno, the half angle of view ω, the image height Y, and the total optical length L of Numerical Example 2.
Figure JPOXMLDOC01-appb-T000007
Figure JPOXMLDOC01-appb-T000007
　無限遠と最至近（２０００ｍｍ）の間のフォーカシングに際して、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間隔、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間隔、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間隔、第４レンズ群Ｇ４と第５レンズ群Ｇ５の間隔、第５レンズ群Ｇ５と第６レンズ群Ｇ６の間隔、第６レンズ群Ｇ６と第７レンズ群Ｇ７の間隔が変化する。数値実施例２における各面間隔の無限遠と最至近における可変間隔を表７に示す。 When focusing between infinity and the closest (2000 mm), the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, the third lens group G3 and the fourth The distance between the lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, the distance between the fifth lens group G5 and the sixth lens group G6, and the distance between the sixth lens group G6 and the seventh lens group G7 change. .. Numerical values Table 7 shows the infinity and the closest variable spacing of each surface spacing in Example 2.
Figure JPOXMLDOC01-appb-T000008
Figure JPOXMLDOC01-appb-T000008
　数値実施例２における非球面の４次、６次、８次、１０次、１２次の非球面係数Ａ４、Ａ６、Ａ８、Ａ１０、Ａ１２を円錐定数κと共に表８に示す。 Table 8 shows the 4th, 6th, 8th, 10th, and 12th aspherical coefficients A4, A6, A8, A10, and A12 of the aspherical surface in Numerical Example 2 together with the conical constant κ.
Figure JPOXMLDOC01-appb-T000009
Figure JPOXMLDOC01-appb-T000009
　数値実施例２における各レンズ群の焦点距離を表９に示す。 Numerical values Table 9 shows the focal lengths of each lens group in Example 2.
Figure JPOXMLDOC01-appb-T000010
Figure JPOXMLDOC01-appb-T000010
　図２５乃至図３０は数値実施例２の縦収差図、図３１乃至図３６は数値実施例２の横収差図である。図２５乃至図３０には、球面収差において実線はｄ線（５８７．５６ｎｍ）の値を示し、点線はｃ線（６５６．２７ｎｍ）の値を示し、一点鎖線はｇ線（４３５．８４ｎｍ）の値を示し、非点収差において実線はｄ線のサジタル像面の値を示し、破線はｄ線のメリジオアナル像面の値を示し、歪曲収差においてｄ線の値を示す。図３１乃至図３６において、実線はｄ線の値を示し、点線はｃ線の値を示し、一点鎖線はｇ線の値を示す。 25 to 30 are longitudinal aberration diagrams of Numerical Example 2, and FIGS. 31 to 36 are transverse aberration diagrams of Numerical Example 2. In FIGS. 25 to 30, the solid line shows the value of the d line (587.56 nm), the dotted line shows the value of the c line (656.27 nm), and the alternate long and short dash line shows the value of the g line (435.84 nm). In the astigmatism, the solid line shows the value of the sagittal image plane of the d line, the broken line shows the value of the meridional image plane of the d line, and the distortion shows the value of the d line. In FIGS. 31 to 36, the solid line indicates the value of the d line, the dotted line indicates the value of the c line, and the alternate long and short dash line indicates the value of the g line.
　以上の構成により、ズームレンズ２は高画質な望遠ズームレンズを実現した上で軽量化が図られている。 With the above configuration, the zoom lens 2 is designed to be lightweight while realizing a high-quality telephoto zoom lens.
　また、各収差図から、数値実施例２は諸収差が良好に補正され、優れた結像性能を有していることが明らかである。 Further, from each aberration diagram, it is clear that Numerical Example 2 has various aberrations corrected well and has excellent imaging performance.
　<第３の実施の形態>
　図３７乃至図４２は、本技術の第３の実施の形態におけるズームレンズ３のレンズ構成を示している。 <Third embodiment>
37 to 42 show the lens configuration of the zoom lens 3 according to the third embodiment of the present technology.
　ズームレンズ３は、物体側より像側へ順に配置された第１レンズ群Ｇ１と第２レンズ群Ｇ２と第３レンズ群Ｇ３と第４レンズ群Ｇ４と第５レンズ群Ｇ５と第６レンズ群Ｇ６を有している。第１レンズ群Ｇ１は正のレンズ群として設けられ、第２レンズ群Ｇ２は正のレンズ群として設けられ、第３レンズ群Ｇ３は負のレンズ群として設けられている。 The zoom lens 3 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6 arranged in order from the object side to the image side. have. The first lens group G1 is provided as a positive lens group, the second lens group G2 is provided as a positive lens group, and the third lens group G3 is provided as a negative lens group.
　第１レンズ群Ｇ１は変倍時に固定され、第２レンズ群Ｇ２と第３レンズ群Ｇ３は変倍時に移動される。 The first lens group G1 is fixed at the time of scaling, and the second lens group G2 and the third lens group G3 are moved at the time of scaling.
　第１レンズ群Ｇ１は、物体側から像側へ順に、物体側に凸面を向けた正メニスカスレンズＬ１１、物体側に凸面を向けた負メニスカスレンズＬ１２、正レンズＬ１３、正レンズＬ１４によって構成されている。 The first lens group G1 is composed of a positive meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, a positive lens L13, and a positive lens L14 in order from the object side to the image side. There is.
　第２レンズ群Ｇ２は像側に凸面を向けた正メニスカスレンズＬ２１によって構成されている。 The second lens group G2 is composed of a positive meniscus lens L21 with a convex surface facing the image side.
　第３レンズ群Ｇ３は、物体側から像側へ順に、負レンズＬ３１、正レンズＬ３２、負レンズＬ３３、負レンズＬ３４によって構成されている。正レンズＬ３２と負レンズＬ３３は接合レンズとして構成されている。 The third lens group G3 is composed of a negative lens L31, a positive lens L32, a negative lens L33, and a negative lens L34 in this order from the object side to the image side. The positive lens L32 and the negative lens L33 are configured as a junction lens.
　第４レンズ群Ｇ４は、物体側から像側へ順に、負レンズＬ４１、物体側に凸面を向けた正メニスカスレンズＬ４２によって構成されている。負レンズＬ４１と正メニスカスレンズＬ４２は接合レンズとして構成されている。 The fourth lens group G4 is composed of a negative lens L41 and a positive meniscus lens L42 with a convex surface facing the object side in order from the object side to the image side. The negative lens L41 and the positive meniscus lens L42 are configured as a junction lens.
　第５レンズ群Ｇ５は、物体側から像側へ順に、正レンズＬ５１、物体側に凸面を向けた負メニスカスレンズＬ５２、正レンズＬ５３によって構成されている。負メニスカスレンズＬ５２と正レンズＬ５３は接合レンズとして構成されている。 The fifth lens group G5 is composed of a positive lens L51, a negative meniscus lens L52 with a convex surface facing the object side, and a positive lens L53 in this order from the object side to the image side. The negative meniscus lens L52 and the positive lens L53 are configured as a junction lens.
　第６レンズ群Ｇ６は、物体側から像側へ順に、像側に凸面を向けた負メニスカスレンズＬ６１、物体側に凸面を向けた正メニスカスレンズＬ６２、開口絞りＳ、正レンズＬ６３、負レンズＬ６４、物体側に凸面を向けた正メニスカスレンズＬ６５、正レンズＬ６６、負レンズＬ６７、正レンズＬ６８、像側に凸面を向けた負メニスカスレンズＬ６９、正レンズＬ６１０、像側に凸面を向けた正メニスカスレンズＬ６１１、像側に凸面を向けた負メニスカスレンズＬ６１２、負レンズＬ６１３によって構成されている。正レンズＬ６３と負レンズＬ６４は接合レンズとして構成され、正レンズＬ６６と負レンズＬ６７は接合レンズとして構成され、正メニスカスレンズＬ６１１と負メニスカスレンズＬ６１２は接合レンズとして構成されている。 The sixth lens group G6 includes a negative meniscus lens L61 with a convex surface facing the image side, a positive meniscus lens L62 with a convex surface facing the object side, an aperture aperture S, a positive lens L63, and a negative lens L64 in order from the object side to the image side. , Positive meniscus lens L65 with convex surface facing the object side, positive lens L66, negative lens L67, positive lens L68, negative meniscus lens L69 with convex surface facing the image side, positive lens L610, positive meniscus with convex surface facing the image side It is composed of a lens L611, a negative meniscus lens L612 with a convex surface facing the image side, and a negative lens L613. The positive lens L63 and the negative lens L64 are configured as a junction lens, the positive lens L66 and the negative lens L67 are configured as a junction lens, and the positive meniscus lens L611 and the negative meniscus lens L612 are configured as a junction lens.
　無限遠から近距離へのフォーカシングに際しては、第５レンズ群Ｇ５が光軸方向へ移動される。尚、フォーカシングに際しては、正メニスカスレンズＬ６１１、負メニスカスレンズＬ６１２が光軸方向へ移動される構成等の他の構成にされていてもよい。また、接合レンズを構成する正レンズＬ６６と負レンズＬ６７が光軸方向に直交する方向へ移動されることにより、手振れ等に対して防振を行うことができる。 When focusing from infinity to a short distance, the fifth lens group G5 is moved in the optical axis direction. At the time of focusing, the positive meniscus lens L611 and the negative meniscus lens L612 may have other configurations such as being moved in the optical axis direction. Further, by moving the positive lens L66 and the negative lens L67 constituting the bonded lens in the direction orthogonal to the optical axis direction, vibration isolation can be performed against camera shake and the like.
　表１０に、ズームレンズ３に具体的数値を適用した数値実施例３のレンズデータを示す。 Table 10 shows the lens data of Numerical Example 3 in which specific numerical values are applied to the zoom lens 3.
Figure JPOXMLDOC01-appb-T000011
Figure JPOXMLDOC01-appb-T000011
　数値実施例３の焦点距離ｆ、ＦナンバーＦｎｏ、半画角ω、像高Ｙ及び光学全長Ｌを表１１に示す。 Table 11 shows the focal length f, the F number Fno, the half angle of view ω, the image height Y, and the total optical length L of Numerical Example 3.
Figure JPOXMLDOC01-appb-T000012
Figure JPOXMLDOC01-appb-T000012
　無限遠と最至近（２０００ｍｍ）の間のフォーカシングに際して、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間隔、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間隔、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間隔、第４レンズ群Ｇ４と第５レンズ群Ｇ５の間隔、第５レンズ群Ｇ５と第６レンズ群Ｇ６の間隔が変化する。数値実施例３における各面間隔の無限遠と最至近における可変間隔を表１２に示す。 When focusing between infinity and the closest (2000 mm), the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, the third lens group G3 and the fourth The distance between the lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6 change. Numerical values Table 12 shows the infinity and the closest variable spacing of each surface spacing in Example 3.
Figure JPOXMLDOC01-appb-T000013
Figure JPOXMLDOC01-appb-T000013
　数値実施例３における各レンズ群の焦点距離を表１３に示す。 Numerical values Table 13 shows the focal lengths of each lens group in Example 3.
Figure JPOXMLDOC01-appb-T000014
Figure JPOXMLDOC01-appb-T000014
　図４３乃至図４８は数値実施例３の縦収差図、図４９乃至図５４は数値実施例３の横収差図である。図４３乃至図４８には、球面収差において実線はｄ線（５８７．５６ｎｍ）の値を示し、点線はｃ線（６５６．２７ｎｍ）の値を示し、一点鎖線はｇ線（４３５．８４ｎｍ）の値を示し、非点収差において実線はｄ線のサジタル像面の値を示し、破線はｄ線のメリジオアナル像面の値を示し、歪曲収差においてｄ線の値を示す。図４９乃至図５４において、実線はｄ線の値を示し、点線はｃ線の値を示し、一点鎖線はｇ線の値を示す。 43 to 48 are longitudinal aberration diagrams of Numerical Example 3, and FIGS. 49 to 54 are transverse aberration diagrams of Numerical Example 3. In FIGS. 43 to 48, the solid line shows the value of the d line (587.56 nm), the dotted line shows the value of the c line (656.27 nm), and the alternate long and short dash line shows the value of the g line (435.84 nm). In the astigmatism, the solid line shows the value of the sagittal image plane of the d line, the broken line shows the value of the meridional image plane of the d line, and the distortion shows the value of the d line. In FIGS. 49 to 54, the solid line indicates the value of the d line, the dotted line indicates the value of the c line, and the alternate long and short dash line indicates the value of the g line.
　以上の構成により、ズームレンズ３は高画質な望遠ズームレンズを実現した上で軽量化が図られている。 With the above configuration, the zoom lens 3 is designed to be lightweight while realizing a high-quality telephoto zoom lens.
　また、各収差図から、数値実施例３は諸収差が良好に補正され、優れた結像性能を有していることが明らかである。 Further, from each aberration diagram, it is clear that Numerical Example 3 has various aberrations corrected well and has excellent imaging performance.
　<第４の実施の形態>
　図５５乃至図６０は、本技術の第４の実施の形態におけるズームレンズ４のレンズ構成を示している。 <Fourth Embodiment>
55 to 60 show the lens configuration of the zoom lens 4 according to the fourth embodiment of the present technology.
　ズームレンズ４は、物体側より像側へ順に配置された第１レンズ群Ｇ１と第２レンズ群Ｇ２と第３レンズ群Ｇ３と第４レンズ群Ｇ４と第５レンズ群Ｇ５と第６レンズ群Ｇ６を有している。第１レンズ群Ｇ１は正のレンズ群として設けられ、第２レンズ群Ｇ２は正のレンズ群として設けられ、第３レンズ群Ｇ３は負のレンズ群として設けられている。 The zoom lens 4 includes a first lens group G1, a second lens group G2, a third lens group G3, a fourth lens group G4, a fifth lens group G5, and a sixth lens group G6 arranged in order from the object side to the image side. have. The first lens group G1 is provided as a positive lens group, the second lens group G2 is provided as a positive lens group, and the third lens group G3 is provided as a negative lens group.
　第１レンズ群Ｇ１は変倍時に固定され、第２レンズ群Ｇ２と第３レンズ群Ｇ３は変倍時に移動される。 The first lens group G1 is fixed at the time of scaling, and the second lens group G2 and the third lens group G3 are moved at the time of scaling.
　第１レンズ群Ｇ１は、物体側から像側へ順に、物体側に凸面を向けた負メニスカスレンズＬ１１、物体側に凸面を向けた正メニスカスレンズＬ１２、正レンズＬ１３によって構成されている。 The first lens group G1 is composed of a negative meniscus lens L11 having a convex surface facing the object side, a positive meniscus lens L12 having a convex surface facing the object side, and a positive lens L13 in order from the object side to the image side.
　第２レンズ群Ｇ２は、物体側から像側へ順に、物体側に凸面を向けた正メニスカスレンズＬ２１、物体側に凸面を向けた負メニスカスレンズＬ２２によって構成されている。 The second lens group G2 is composed of a positive meniscus lens L21 having a convex surface facing the object side and a negative meniscus lens L22 having a convex surface facing the object side in order from the object side to the image side.
　第３レンズ群Ｇ３は、物体側から像側へ順に、負レンズＬ３１、負レンズＬ３２、正レンズＬ３３によって構成されている。負レンズＬ３２と正レンズＬ３３は接合レンズとして構成されている。 The third lens group G3 is composed of a negative lens L31, a negative lens L32, and a positive lens L33 in this order from the object side to the image side. The negative lens L32 and the positive lens L33 are configured as a junction lens.
　第４レンズ群Ｇ４は、物体側から像側へ順に、像側に凸面を向けた正メニスカスレンズ４１、正レンズＬ４２、正レンズＬ４３、負レンズＬ４４、開口絞りＳ、正レンズＬ４５、物体側に凸面を向けた負メニスカスレンズＬ４６、物体側に凸面を向けた負メニスカスレンズＬ４７、物体側に凸面を向けた正メニスカスレンズＬ４８、物体側に凸面を向けた正メニスカスレンズＬ４９、物体側に凸面を向けた負メニスカスレンズＬ４１０、物体側に凸面を向けた正メニスカスレンズＬ４１１によって構成されている。正レンズＬ４３と負レンズＬ４４は接合レンズとして構成され、負メニスカスレンズＬ４７と正メニスカスレンズＬ４８は接合レンズとして構成され、負メニスカスレンズＬ４１０と正メニスカスレンズＬ４１１は接合レンズとして構成されている。 The fourth lens group G4 includes a positive meniscus lens 41, a positive lens L42, a positive lens L43, a negative lens L44, an aperture aperture S, a positive lens L45, and an object side in order from the object side to the image side. Negative meniscus lens L46 with convex surface, negative meniscus lens L47 with convex surface toward the object side, positive meniscus lens L48 with convex surface toward the object side, positive meniscus lens L49 with convex surface toward the object side, convex surface toward the object side It is composed of a negative meniscus lens L410 directed toward the object and a positive meniscus lens L411 with a convex surface facing the object side. The positive lens L43 and the negative lens L44 are configured as a junction lens, the negative meniscus lens L47 and the positive meniscus lens L48 are configured as a junction lens, and the negative meniscus lens L410 and the positive meniscus lens L411 are configured as a junction lens.
　第５レンズ群Ｇ５は、物体側から像側へ順に、物体側に凸面を向けた負メニスカスレンズＬ５１、負レンズＬ５２、正レンズＬ５３によって構成されている。負レンズＬ５２と正レンズＬ５３は接合レンズとして構成されている。 The fifth lens group G5 is composed of a negative meniscus lens L51, a negative lens L52, and a positive lens L53 whose convex surfaces are directed toward the object side in order from the object side to the image side. The negative lens L52 and the positive lens L53 are configured as a junction lens.
　第６レンズ群Ｇ６は、物体側から像側へ順に、物体側に凸面を向けた正メニスカスレンズＬ６１、像側に凸面を向けた正メニスカスレンズＬ６２、像側に凸面を向けた負メニスカスレンズＬ６３によって構成されている。 The sixth lens group G6 includes a positive meniscus lens L61 having a convex surface facing the object side, a positive meniscus lens L62 having a convex surface facing the image side, and a negative meniscus lens L63 having a convex surface facing the image side in order from the object side to the image side. It is composed of.
　無限遠から近距離へのフォーカシングに際しては、第５レンズ群Ｇ５が光軸方向へ移動される。尚、フォーカシングに際しては、正レンズ４１、正レンズＬ４２、正レンズＬ４３、負レンズＬ４４が光軸方向へ移動される構成等の他の構成にされていてもよい。また、接合レンズを構成する負メニスカスレンズＬ４７と正メニスカスレンズＬ４８が光軸方向に直交する方向へ移動されることにより、手振れ等に対して防振を行うことができる。 When focusing from infinity to a short distance, the fifth lens group G5 is moved in the optical axis direction. At the time of focusing, other configurations such as a configuration in which the positive lens 41, the positive lens L42, the positive lens L43, and the negative lens L44 are moved in the optical axis direction may be used. Further, by moving the negative meniscus lens L47 and the positive meniscus lens L48 constituting the bonded lens in the direction orthogonal to the optical axis direction, vibration isolation can be performed against camera shake and the like.
　表１４に、ズームレンズ４に具体的数値を適用した数値実施例４のレンズデータを示す。 Table 14 shows the lens data of Numerical Example 4 in which specific numerical values are applied to the zoom lens 4.
Figure JPOXMLDOC01-appb-T000015
Figure JPOXMLDOC01-appb-T000015
　数値実施例４の焦点距離ｆ、ＦナンバーＦｎｏ、半画角ω、像高Ｙ及び光学全長Ｌを表１５に示す。 Table 15 shows the focal length f, the F number Fno, the half angle of view ω, the image height Y, and the total optical length L of Numerical Example 4.
Figure JPOXMLDOC01-appb-T000016
Figure JPOXMLDOC01-appb-T000016
　無限遠と最至近（２０００ｍｍ）の間のフォーカシングに際して、第１レンズ群Ｇ１と第２レンズ群Ｇ２の間隔、第２レンズ群Ｇ２と第３レンズ群Ｇ３の間隔、第３レンズ群Ｇ３と第４レンズ群Ｇ４の間隔、第４レンズ群Ｇ４と第５レンズ群Ｇ５の間隔、第５レンズ群Ｇ５と第６レンズ群Ｇ６の間隔が変化する。数値実施例４における各面間隔の無限遠と最至近における可変間隔を表１６に示す。 When focusing between infinity and the closest (2000 mm), the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, the third lens group G3 and the fourth The distance between the lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6 change. Numerical values Table 16 shows the infinity and the closest variable spacing of each surface spacing in Example 4.
Figure JPOXMLDOC01-appb-T000017
Figure JPOXMLDOC01-appb-T000017
　数値実施例４における非球面の４次、６次、８次、１０次、１２次の非球面係数Ａ４、Ａ６、Ａ８、Ａ１０、Ａ１２を円錐定数κと共に表１７に示す。 Table 17 shows the 4th, 6th, 8th, 10th, and 12th aspherical coefficients A4, A6, A8, A10, and A12 of the aspherical surface in Numerical Example 4 together with the conical constant κ.
Figure JPOXMLDOC01-appb-T000018
Figure JPOXMLDOC01-appb-T000018
　数値実施例４における各レンズ群の焦点距離を表１８に示す。 Numerical values Table 18 shows the focal lengths of each lens group in Example 4.
Figure JPOXMLDOC01-appb-T000019
Figure JPOXMLDOC01-appb-T000019
　図６１乃至図６６は数値実施例４の縦収差図、図６７乃至図７２は数値実施例４の横収差図である。図６１乃至図６６には、球面収差において実線はｄ線（５８７．５６ｎｍ）の値を示し、点線はｃ線（６５６．２７ｎｍ）の値を示し、一点鎖線はｇ線（４３５．８４ｎｍ）の値を示し、非点収差において実線はｄ線のサジタル像面の値を示し、破線はｄ線のメリジオアナル像面の値を示し、歪曲収差においてｄ線の値を示す。図６７乃至図７２において、実線はｄ線の値を示し、点線はｃ線の値を示し、一点鎖線はｇ線の値を示す。 61 to 66 are longitudinal aberration diagrams of Numerical Example 4, and FIGS. 67 to 72 are transverse aberration diagrams of Numerical Example 4. In FIGS. 61 to 66, the solid line shows the value of the d line (587.56 nm), the dotted line shows the value of the c line (656.27 nm), and the alternate long and short dash line shows the value of the g line (435.84 nm). In the astigmatism, the solid line shows the value of the sagittal image plane of the d line, the broken line shows the value of the meridional image plane of the d line, and the distortion shows the value of the d line. In FIGS. 67 to 72, the solid line indicates the value of the d line, the dotted line indicates the value of the c line, and the alternate long and short dash line indicates the value of the g line.
　以上の構成により、ズームレンズ４は高画質な望遠ズームレンズを実現した上で軽量化が図られている。 With the above configuration, the zoom lens 4 is designed to be lightweight while realizing a high-quality telephoto zoom lens.
　また、各収差図から、数値実施例４は諸収差が良好に補正され、優れた結像性能を有していることが明らかである。 Further, from each aberration diagram, it is clear that the numerical embodiment 4 has various aberrations corrected well and has excellent imaging performance.
　［ズームレンズの条件式の各値］
　以下に、本技術ズームレンズの条件式の各値について説明する。 [Each value of the conditional expression of the zoom lens]
Each value of the conditional expression of the zoom lens of this technology will be described below.
　表１９にズームレンズ１乃至ズームレンズ４の数値実施例１乃至数値実施例４における条件式（１）乃至条件式（５）の各値を示す。 Table 19 shows the values of the conditional expressions (1) to (5) in the numerical examples 1 to 4 of the zoom lenses 1 to 4.
Figure JPOXMLDOC01-appb-T000020
Figure JPOXMLDOC01-appb-T000020
　表１９から明らかなように、ズームレンズ１乃至ズームレンズ４は条件式（１）乃至条件式（５）を満足するようにされている。 As is clear from Table 19, the zoom lenses 1 to 4 are designed to satisfy the conditional expressions (1) to (5).
　［撮像装置の構成］
　本技術撮像装置は、ズームレンズが、物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、第１レンズ群は変倍時に固定され第２レンズ群と第３レンズ群は変倍時に移動され、第１レンズ群は４枚以下のレンズによって構成され、以下の条件式（１）及び条件式（２）を満足する。
（１）１．００<ｆ２／ｆ１<１１．００
（２）０．５７<ｍ２／ｍ３<０．９５
　但し、
ｆ１：第１レンズ群の焦点距離
ｆ２：第２レンズ群の焦点距離
ｍ２：広角端から望遠端までの変倍時における第２レンズ群の移動量
ｍ３：広角端から望遠端までの変倍時における第３レンズ群の移動量
とする。 [Configuration of imaging device]
In the imaging device of the present technology, the zoom lens has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens group is changed. The second lens group and the third lens group are fixed at the time of magnification and are moved at the time of magnification change, and the first lens group is composed of four or less lenses and satisfies the following conditional equations (1) and (2). ..
(1) 1.00 <f2 / f1 <11.00
(2) 0.57 <m2 / m3 <0.95
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group m2: Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end m3: At the time of scaling from the wide-angle end to the telephoto end It is the amount of movement of the third lens group in.
　上記のように、物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、第１レンズ群が４枚以下のレンズによって構成されて変倍時に固定され、第２レンズ群と第３レンズ群が変倍時に移動されることにより、光学系の軽量化を図ることが可能になる。また、第１レンズ群が少ない枚数の構成にされているが、第２レンズ群を正レンズ群にすることにより合計の屈折力を大きくすると共に良好な収差補正ができるようにしている。 As described above, a lens having a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side, and the first lens group has four or less lenses. The weight of the optical system can be reduced by being configured and fixed at the time of magnification change, and by moving the second lens group and the third lens group at the time of magnification change. Further, although the number of the first lens group is small, the total refractive power is increased and good aberration correction can be performed by making the second lens group a positive lens group.
　本技術撮像装置は、ズームレンズが条件式（１）を満足することにより、第１レンズ群の屈折力が適正化され、光学系の小径化を図ることができると共に諸収差、特に、球面収差、軸上色収差及び倍率色収差を良好に補正することができる。 In the imaging device of the present technology, when the zoom lens satisfies the condition equation (1), the refractive power of the first lens group is optimized, the diameter of the optical system can be reduced, and various aberrations, particularly spherical aberration, can be achieved. , Axial chromatic aberration and lateral chromatic aberration can be satisfactorily corrected.
　また、本技術撮像装置は、ズームレンズが条件式（２）を満足することにより、望遠端における第２レンズ群に入射する光線の径が小さくなると共に第２レンズ群によるズーミング時の減倍効果が抑制されるため、光学系の小径化及び高倍率化を図ることができる。　以上のように、本技術撮像装置によれば、軽量でありながら諸収差を良好に補正したズームレンズを備えた撮像装置を提供することができる。 Further, in the imaging device of the present technology, when the zoom lens satisfies the condition equation (2), the diameter of the light beam incident on the second lens group at the telephoto end becomes smaller and the magnification effect at the time of zooming by the second lens group becomes smaller. Therefore, it is possible to reduce the diameter and increase the magnification of the optical system. As described above, according to the image pickup device of the present technology, it is possible to provide an image pickup device provided with a zoom lens that is lightweight and has satisfactorily corrected various aberrations.
　［撮像装置の一実施形態］
　図７３に、本技術撮像装置の一実施形態によるデジタルスチルカメラのブロック図を示す。 [One Embodiment of an Imaging Device]
FIG. 73 shows a block diagram of a digital still camera according to an embodiment of the imaging device of the present technology.
　撮像装置（デジタルスチルカメラ）１００は、取り込まれた光を電気信号に変換する光電変換機能を有する撮像素子１０と、撮影された画像信号のアナログ－デジタル変換等の信号処理を行うカメラ信号処理部２０と、画像信号の記録再生処理を行う画像処理部３０とを有している。また、撮像装置１００は、撮影された画像等を表示する表示部４０と、メモリー９０への画像信号の書込及び読出を行うＲ／Ｗ（リーダ／ライタ）５０と、撮像装置１００の全体を制御するＣＰＵ（Central Processing Unit）６０と、ユーザーによって所要の操作が行われる各種のスイッチ等の入力部７０と、ズームレンズ１（ズームレンズ２、ズームレンズ３及びズームレンズ４を含む。）の駆動を制御するレンズ駆動制御部８０とを備えている。 The image pickup device (digital still camera) 100 includes an image pickup element 10 having a photoelectric conversion function for converting captured light into an electric signal, and a camera signal processing unit that performs signal processing such as analog-digital conversion of the captured image signal. 20 and an image processing unit 30 that performs recording / reproduction processing of an image signal. Further, the image pickup device 100 includes a display unit 40 for displaying a captured image and the like, an R / W (reader / writer) 50 for writing and reading an image signal to the memory 90, and the entire image pickup device 100. Driving of a CPU (Central Processing Unit) 60 to control, an input unit 70 such as various switches for which a user performs a required operation, and a zoom lens 1 (including a zoom lens 2, a zoom lens 3 and a zoom lens 4). It is provided with a lens drive control unit 80 for controlling the above.
　カメラ信号処理部２０は、撮像素子１０からの出力信号に対するデジタル信号への変換、ノイズ除去、画質補正、輝度・色差信号への変換等の各種の信号処理を行う。 The camera signal processing unit 20 performs various signal processing such as conversion of the output signal from the image pickup element 10 into a digital signal, noise removal, image quality correction, and conversion into a brightness / color difference signal.
　画像処理部３０は、所定の画像データフォーマットに基づく画像信号の圧縮符号化・伸張復号化処理や解像度等のデータ仕様の変換処理等を行う。 The image processing unit 30 performs compression coding / decompression decoding processing of an image signal based on a predetermined image data format, conversion processing of data specifications such as resolution, and the like.
　表示部４０はユーザーの入力部７０に対する操作状態や撮影した画像等の各種のデータを表示する機能を有している。 The display unit 40 has a function of displaying various data such as an operation state of the user's input unit 70 and a captured image.
　Ｒ／Ｗ５０は、画像処理部３０によって符号化された画像データのメモリー９０への書込及びメモリー９０に記録された画像データの読出を行う。 The R / W 50 writes the image data encoded by the image processing unit 30 to the memory 90 and reads the image data recorded in the memory 90.
　ＣＰＵ６０は、撮像装置１００に設けられた各回路ブロックを制御する制御処理部として機能し、入力部７０からの指示入力信号等に基づいて各回路ブロックを制御する。 The CPU 60 functions as a control processing unit that controls each circuit block provided in the image pickup apparatus 100, and controls each circuit block based on an instruction input signal or the like from the input unit 70.
　入力部７０はユーザーによる操作に応じた指示入力信号をＣＰＵ６０に対して出力する。 The input unit 70 outputs an instruction input signal according to the operation by the user to the CPU 60.
　レンズ駆動制御部８０は、ＣＰＵ６０からの制御信号に基づいてレンズ群を駆動する図示しないモータ等を制御する。 The lens drive control unit 80 controls a motor or the like (not shown) that drives a lens group based on a control signal from the CPU 60.
　メモリー９０は、例えば、Ｒ／Ｗ５０に接続されたスロットに対して着脱可能な半導体メモリーである。尚、メモリー９０は、スロットに対して着脱可能にされておらず、撮像装置１００の内部に組み込まれていてもよい。 The memory 90 is, for example, a semiconductor memory that can be attached to and detached from the slot connected to the R / W 50. The memory 90 is not detachable from the slot and may be incorporated inside the image pickup apparatus 100.
　以下に、撮像装置１００における動作を説明する。 The operation of the image pickup apparatus 100 will be described below.
　撮影の待機状態では、ＣＰＵ６０による制御の下で、撮影された画像信号がカメラ信号処理部２０を介して表示部４０に出力され、カメラスルー画像として表示される。 In the shooting standby state, under the control of the CPU 60, the shot image signal is output to the display unit 40 via the camera signal processing unit 20 and displayed as a camera-through image.
　入力部７０からの指示入力信号により撮影が行われると、撮影された画像信号がカメラ信号処理部２０から画像処理部３０に出力されて圧縮符号化処理され、所定のデータフォーマットのデジタルデータに変換される。変換されたデータはＲ／Ｗ５０に出力され、メモリー９０に書き込まれる。 When shooting is performed by the instruction input signal from the input unit 70, the shot image signal is output from the camera signal processing unit 20 to the image processing unit 30, compressed and encoded, and converted into digital data in a predetermined data format. Will be done. The converted data is output to the R / W 50 and written to the memory 90.
　フォーカシングはＣＰＵ６０からの制御信号に基づいてレンズ駆動制御部８０がフォーカスレンズ群を移動させることにより行われる。 Focusing is performed by the lens drive control unit 80 moving the focus lens group based on the control signal from the CPU 60.
　メモリー９０に記録された画像データを再生する場合には、入力部７０に対する操作に応じてＲ／Ｗ５０によってメモリー９０から所定の画像データが読み出され、画像処理部３０によって伸張復号化処理が行われた後に、再生画像信号が表示部４０に出力されて再生画像が表示される。 When the image data recorded in the memory 90 is reproduced, the R / W 50 reads out the predetermined image data from the memory 90 in response to the operation on the input unit 70, and the image processing unit 30 performs the decompression / decoding process. After that, the reproduced image signal is output to the display unit 40 and the reproduced image is displayed.
　尚、本技術において、「撮像」とは、撮像素子１０による取り込まれた光を電気信号に変換する光電変換処理から、カメラ信号処理部２０による撮像素子１０からの出力信号に対するデジタル信号への変換、ノイズ除去、画質補正、輝度・色差信号への変換等の処理、画像処理部３０による所定の画像データフォーマットに基づく画像信号の圧縮符号化・伸張復号化処理や解像度等のデータ仕様の変換処理、Ｒ／Ｗ５０によるメモリー９０への画像信号の書込処理までの一連の処理の一部のみ、又は全てを含む処理のことを言う。 In the present technology, "imaging" means converting the photoelectric conversion process of converting the light captured by the image pickup element 10 into an electric signal to the digital signal of the output signal from the image pickup element 10 by the camera signal processing unit 20. , Noise removal, image quality correction, conversion to brightness / color difference signals, etc., compression coding / decompression decoding processing of image signals based on a predetermined image data format by the image processing unit 30, and conversion processing of data specifications such as resolution. , A process including only a part or all of a series of processes up to the process of writing an image signal to the memory 90 by the R / W 50.
　即ち、「撮像」とは、撮像素子１０による取り込まれた光を電気信号に変換する光電変換処理のみを指してもよく、撮像素子１０による取り込まれた光を電気信号に変換する光電変換処理からカメラ信号処理部２０による撮像素子１０からの出力信号に対するデジタル信号への変換、ノイズ除去、画質補正、輝度・色差信号への変換等の処理までを指してもよく、撮像素子１０による取り込まれた光を電気信号に変換する光電変換処理からカメラ信号処理部２０による撮像素子１０からの出力信号に対するデジタル信号への変換、ノイズ除去、画質補正、輝度・色差信号への変換等の処理を経て、画像処理部３０による所定の画像データフォーマットに基づく画像信号の圧縮符号化・伸張復号化処理や解像度等のデータ仕様の変換処理までを指してもよく、撮像素子１０による取り込まれた光を電気信号に変換する光電変換処理からカメラ信号処理部２０による撮像素子１０からの出力信号に対するデジタル信号への変換、ノイズ除去、画質補正、輝度・色差信号への変換等の処理、及び画像処理部３０による所定の画像データフォーマットに基づく画像信号の圧縮符号化・伸張復号化処理や解像度等のデータ仕様の変換処理を経て指してもよく、Ｒ／Ｗ５０によるメモリー９０への画像信号の書込処理までを指してもよい。上記の処理において各処理の順番は適宜入れ替わってもよい。 That is, "imaging" may refer only to the photoelectric conversion process for converting the light captured by the imaging element 10 into an electric signal, and from the photoelectric conversion process for converting the light captured by the imaging element 10 into an electric signal. It may also refer to processing such as conversion of the output signal from the image pickup element 10 by the camera signal processing unit 20 into a digital signal, noise removal, image quality correction, and conversion into a brightness / color difference signal, and is captured by the image pickup element 10. After the photoelectric conversion process for converting light into an electric signal, the camera signal processing unit 20 converts the output signal from the image pickup element 10 into a digital signal, noise removal, image quality correction, conversion into a brightness / color difference signal, and the like. It may also refer to compression coding / decompression decoding processing of an image signal based on a predetermined image data format by the image processing unit 30 and conversion processing of data specifications such as resolution, and the light captured by the image pickup element 10 is an electric signal. The photoelectric conversion process of converting to It may be pointed out through compression coding / decompression decoding processing of an image signal based on a predetermined image data format, conversion processing of data specifications such as resolution, and writing processing of an image signal to the memory 90 by the R / W 50. You may point. In the above processing, the order of each processing may be changed as appropriate.
　また、本技術において、撮像装置１００は、上記の処理を行う撮像素子１０、カメラ信号処理部２０、画像処理部３０、Ｒ／Ｗ５０の一部のみ又は全てを含むように構成されていてもよい。 Further, in the present technology, the image pickup device 100 may be configured to include only a part or all of the image pickup element 10, the camera signal processing section 20, the image processing section 30, and the R / W 50 that perform the above processing. ..
　［その他］
　本技術ズームレンズ及び本技術撮像装置においては、第１レンズ群Ｇ１から第６レンズ群Ｇ６に加え又は第１レンズ群Ｇ１から第７レンズ群Ｇ７に加えて屈折力を有さないレンズ等の他の光学要素が配置されていてもよい。この場合において、本技術ズームレンズのレンズ構成は第１レンズ群Ｇ１から第６レンズ群Ｇ６又は第１レンズ群Ｇ１から第７レンズ群Ｇ７の実質的に６群又は７群のレンズ構成にされる。 [others]
In the present technology zoom lens and the present technology imaging device, in addition to the first lens group G1 to the sixth lens group G6 or in addition to the first lens group G1 to the seventh lens group G7, other lenses having no refractive power, etc. Optical elements may be arranged. In this case, the lens configuration of the zoom lens of the present technology is substantially a 6- or 7-group lens configuration of the 1st lens group G1 to the 6th lens group G6 or the 1st lens group G1 to the 7th lens group G7. ..
　尚、上記には、撮像装置をデジタルスチルカメラに適用した例を示したが、撮像装置の適用範囲はデジタルスチルカメラに限られることはなく、デジタルビデオカメラ、カメラが組み込まれた携帯電話等の携帯端末におけるデジタル入出力機器のカメラ部等として広く適用することができる。 Although an example in which the image pickup device is applied to a digital still camera is shown above, the scope of application of the image pickup device is not limited to the digital still camera, and a digital video camera, a mobile phone having a built-in camera, etc. It can be widely applied as a camera unit of a digital input / output device in a mobile terminal.
　［本技術］
　本技術は、以下の構成にすることもできる。 [Technology]
The present technology can also have the following configurations.
　<１>
　物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、
　前記第１レンズ群は変倍時に固定され前記第２レンズ群と前記第３レンズ群は変倍時に移動され、
　前記第１レンズ群は４枚以下のレンズによって構成され、
　以下の条件式（１）及び条件式（２）を満足する
　ズームレンズ。
（１）１．００<ｆ２／ｆ１<１１．００
（２）０．５７<ｍ２／ｍ３<０．９５
　但し、
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
ｍ２：広角端から望遠端までの変倍時における前記第２レンズ群の移動量
ｍ３：広角端から望遠端までの変倍時における前記第３レンズ群の移動量
とする。 <1>
It has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side.
The first lens group is fixed at the time of magnification change, and the second lens group and the third lens group are moved at the time of magnification change.
The first lens group is composed of four or less lenses.
A zoom lens that satisfies the following conditional expression (1) and conditional expression (2).
(1) 1.00 <f2 / f1 <11.00
(2) 0.57 <m2 / m3 <0.95
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group m2: Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end m3: From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
　<２>
　以下の条件式（３）を満足する
　前記<１>に記載のズームレンズ。
（３）－５．０<ｆ１／ｆ２３ｗ<－１．０
但し、
ｆ２３ｗ：前記第２レンズ群と前記第３レンズ群の広角端における合成焦点距離
とする。 <2>
The zoom lens according to <1>, which satisfies the following conditional expression (3).
(3) -5.0 <f1 / f23w <-1.0
However,
f23w: The combined focal length at the wide-angle end of the second lens group and the third lens group.
　<３>
　以下の条件式（４）を満足する
　前記<１>又は前記<２>に記載のズームレンズ。
（４）０．３５<ｆ１／ｆｔ<１．２０
但し、
ｆｔ：望遠端における全系の焦点距離
とする。 <3>
The zoom lens according to <1> or <2>, which satisfies the following conditional expression (4).
(4) 0.35 <f1 / ft <1.20
However,
ft: The focal length of the entire system at the telephoto end.
　<４>
　以下の条件式（５）を満足する
　前記<１>から前記<３>の何れかに記載のズームレンズ。
（５）２．１<ｄ１ｔ／ｄ２ｔ<９．９
但し、
ｄ１ｔ：望遠端における前記第１レンズ群と前記第２レンズ群の間隔
ｄ２ｔ：望遠端における前記第２レンズ群と前記第３レンズ群の間隔
とする。 <4>
The zoom lens according to any one of <1> to <3>, which satisfies the following conditional expression (5).
(5) 2.1 <d1t / d2t <9.9
However,
d1t: Distance between the first lens group and the second lens group at the telephoto end d2t: The distance between the second lens group and the third lens group at the telephoto end.
　<５>
　前記第３レンズ群より像側に位置する群の全体又は一部を光軸方向へ移動させることによりフォーカシングする
　前記<１>から前記<４>の何れかに記載のズームレンズ。 <5>
The zoom lens according to any one of <1> to <4>, which focuses by moving all or a part of a group located on the image side of the third lens group in the optical axis direction.
　<６>
　ズームレンズと前記ズームレンズによって形成された光学像を電気的信号に変換する撮像素子とを備え、
　前記ズームレンズは、
　物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、
　前記第１レンズ群は変倍時に固定され前記第２レンズ群と前記第３レンズ群は変倍時に移動され、
　前記第１レンズ群は４枚以下のレンズによって構成され、
　以下の条件式（１）及び条件式（２）を満足する
　撮像装置。
（１）１．００<ｆ２／ｆ１<１１．００
（２）０．５７<ｍ２／ｍ３<０．９５
　但し、
ｆ１：前記第１レンズ群の焦点距離
ｆ２：前記第２レンズ群の焦点距離
ｍ２：広角端から望遠端までの変倍時における前記第２レンズ群の移動量
ｍ３：広角端から望遠端までの変倍時における前記第３レンズ群の移動量
とする。 <6>
It includes a zoom lens and an image pickup device that converts an optical image formed by the zoom lens into an electrical signal.
The zoom lens is
It has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side.
The first lens group is fixed at the time of magnification change, and the second lens group and the third lens group are moved at the time of magnification change.
The first lens group is composed of four or less lenses.
An imaging device that satisfies the following conditional expression (1) and conditional expression (2).
(1) 1.00 <f2 / f1 <11.00
(2) 0.57 <m2 / m3 <0.95
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group m2: Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end m3: From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
１　　　　ズームレンズ
２　　　　ズームレンズ
３　　　　ズームレンズ
４　　　　ズームレンズ
１００　　撮像装置
Ｇ１　　　第１レンズ群
Ｇ２　　　第２レンズ群
Ｇ３　　　第３レンズ群 1 Zoom lens 2 Zoom lens 3 Zoom lens 4 Zoom lens 100 Imaging device G1 1st lens group G2 2nd lens group G3 3rd lens group

Claims (6)

  1. 　物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、
    　前記第１レンズ群は変倍時に固定され前記第２レンズ群と前記第３レンズ群は変倍時に移動され、
    　前記第１レンズ群は４枚以下のレンズによって構成され、
    　以下の条件式（１）及び条件式（２）を満足する
    　ズームレンズ。
    （１）１．００<ｆ２／ｆ１<１１．００
    （２）０．５７<ｍ２／ｍ３<０．９５
    　但し、
    ｆ１：前記第１レンズ群の焦点距離
    ｆ２：前記第２レンズ群の焦点距離
    ｍ２：広角端から望遠端までの変倍時における前記第２レンズ群の移動量
    ｍ３：広角端から望遠端までの変倍時における前記第３レンズ群の移動量
    とする。     It has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side.
    The first lens group is fixed at the time of magnification change, and the second lens group and the third lens group are moved at the time of magnification change.
    The first lens group is composed of four or less lenses.
    A zoom lens that satisfies the following conditional expression (1) and conditional expression (2).
    (1) 1.00 <f2 / f1 <11.00
    (2) 0.57 <m2 / m3 <0.95
    However,
    f1: Focal length of the first lens group f2: Focal length of the second lens group m2: Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end m3: From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
  2. 　以下の条件式（３）を満足する
    　請求項１に記載のズームレンズ。
    （３）－５．０<ｆ１／ｆ２３ｗ<－１．０
    但し、
    ｆ２３ｗ：前記第２レンズ群と前記第３レンズ群の広角端における合成焦点距離
    とする。     The zoom lens according to claim 1, which satisfies the following conditional expression (3).
    (3) -5.0 <f1 / f23w <-1.0
    However,
    f23w: The combined focal length at the wide-angle end of the second lens group and the third lens group.
  3. 　以下の条件式（４）を満足する
    　請求項１に記載のズームレンズ。
    （４）０．３５<ｆ１／ｆｔ<１．２０
    但し、
    ｆｔ：望遠端における全系の焦点距離
    とする。     The zoom lens according to claim 1, which satisfies the following conditional expression (4).
    (4) 0.35 <f1 / ft <1.20
    However,
    ft: The focal length of the entire system at the telephoto end.
  4. 　以下の条件式（５）を満足する
    　請求項１に記載のズームレンズ。
    （５）２．１<ｄ１ｔ／ｄ２ｔ<９．９
    但し、
    ｄ１ｔ：望遠端における前記第１レンズ群と前記第２レンズ群の間隔
    ｄ２ｔ：望遠端における前記第２レンズ群と前記第３レンズ群の間隔
    とする。     The zoom lens according to claim 1, which satisfies the following conditional expression (5).
    (5) 2.1 <d1t / d2t <9.9
    However,
    d1t: Distance between the first lens group and the second lens group at the telephoto end d2t: The distance between the second lens group and the third lens group at the telephoto end.
  5. 　前記第３レンズ群より像側に位置する群の全体又は一部を光軸方向へ移動させることによりフォーカシングする
    　請求項１に記載のズームレンズ。     The zoom lens according to claim 1, wherein focusing is performed by moving all or a part of the group located on the image side of the third lens group in the optical axis direction.
  6. 　ズームレンズと前記ズームレンズによって形成された光学像を電気的信号に変換する撮像素子とを備え、
    　前記ズームレンズは、
    　物体側より像側へ順に配置された正の第１レンズ群と正の第２レンズ群と負の第３レンズ群を有し、
    　前記第１レンズ群は変倍時に固定され前記第２レンズ群と前記第３レンズ群は変倍時に移動され、
    　前記第１レンズ群は４枚以下のレンズによって構成され、
    　以下の条件式（１）及び条件式（２）を満足する
    　撮像装置。
    （１）１．００<ｆ２／ｆ１<１１．００
    （２）０．５７<ｍ２／ｍ３<０．９５
    　但し、
    ｆ１：前記第１レンズ群の焦点距離
    ｆ２：前記第２レンズ群の焦点距離
    ｍ２：広角端から望遠端までの変倍時における前記第２レンズ群の移動量
    ｍ３：広角端から望遠端までの変倍時における前記第３レンズ群の移動量
    とする。     It includes a zoom lens and an image pickup device that converts an optical image formed by the zoom lens into an electrical signal.
    The zoom lens is
    It has a positive first lens group, a positive second lens group, and a negative third lens group arranged in order from the object side to the image side.
    The first lens group is fixed at the time of magnification change, and the second lens group and the third lens group are moved at the time of magnification change.
    The first lens group is composed of four or less lenses.
    An imaging device that satisfies the following conditional expression (1) and conditional expression (2).
    (1) 1.00 <f2 / f1 <11.00
    (2) 0.57 <m2 / m3 <0.95
    However,
    f1: Focal length of the first lens group f2: Focal length of the second lens group m2: Movement amount of the second lens group at the time of scaling from the wide-angle end to the telephoto end m3: From the wide-angle end to the telephoto end It is the amount of movement of the third lens group at the time of variable magnification.
PCT/JP2021/005992 2020-03-31 2021-02-17 Zoom lens and imaging device WO2021199758A1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6352113A (en) * 1986-08-22 1988-03-05 Ricoh Co Ltd Zoom lens for infrared ray
JP2017040874A (en) * 2015-08-21 2017-02-23 株式会社タムロン Zoom lens and imaging apparatus
JP2018132675A (en) * 2017-02-16 2018-08-23 キヤノン株式会社 Zoom lens and imaging device having the same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6352113A (en) * 1986-08-22 1988-03-05 Ricoh Co Ltd Zoom lens for infrared ray
JP2017040874A (en) * 2015-08-21 2017-02-23 株式会社タムロン Zoom lens and imaging apparatus
JP2018132675A (en) * 2017-02-16 2018-08-23 キヤノン株式会社 Zoom lens and imaging device having the same

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