WO2016104786A1 - Système optique à grossissement variable, dispositif optique, et procédé de production de système optique à grossissement variable - Google Patents

Système optique à grossissement variable, dispositif optique, et procédé de production de système optique à grossissement variable Download PDF

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Publication number
WO2016104786A1
WO2016104786A1 PCT/JP2015/086410 JP2015086410W WO2016104786A1 WO 2016104786 A1 WO2016104786 A1 WO 2016104786A1 JP 2015086410 W JP2015086410 W JP 2015086410W WO 2016104786 A1 WO2016104786 A1 WO 2016104786A1
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Prior art keywords
lens group
lens
group
refractive power
optical system
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PCT/JP2015/086410
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English (en)
Japanese (ja)
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山本　浩史
拓 松尾
昭彦 小濱
健介 内田
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株式会社ニコン
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Priority to JP2016566567A priority Critical patent/JP6512227B2/ja
Publication of WO2016104786A1 publication Critical patent/WO2016104786A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
    • G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
    • G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++

Definitions

  • the present invention relates to a variable magnification optical system, an optical apparatus, and a method for manufacturing the variable magnification optical system.
  • variable power optical system as described above has a problem that it cannot achieve good optical performance.
  • a variable magnification optical system has a first lens group having a positive refractive power disposed closest to the object side, and a negative refractive power disposed on the image side from the first lens group.
  • the distance between the lens arranged at the position facing the object side of the focal group changes, the distance between the lens arranged at the position facing the image side of the focused group and the focusing group changes, and
  • the focusing group is composed of one single lens having a positive refractive power, and satisfies the following conditional expression. 1.00 ⁇ ff / ( ⁇ fn) ⁇ 2.30
  • ff focal length of the focusing group
  • fn focal length of the negative lens group
  • a variable magnification optical system includes a first lens group having a positive refractive power arranged closest to the object side, and a negative refractive power arranged on the image side from the first lens group.
  • a focusing group disposed between the first lens group and the positive lens group, and the distance between the first lens group and the negative lens group changes during zooming, and the negative lens group and the positive lens group
  • the distance between the focusing group and the lens arranged at the position facing the object side of the focusing group changes during focusing, and the focusing side and the image side of the focusing group change
  • the distance between the lens and the lens disposed at a position facing the lens changes, and the focusing group is formed by a single lens having a positive refractive power
  • Another aspect of the present invention is: In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power And having a group During zooming, the distance between the lens groups changes,
  • the third lens group comprises one single lens having positive refractive power;
  • a variable magnification optical system that satisfies the following conditional expression is provided. 1.00 ⁇ ff / ( ⁇ fn) ⁇ 2.30
  • fn focal length of the second lens group
  • ff focal length of the third lens group
  • Another aspect of the present invention provides an optical device having the zooming optical system.
  • Another embodiment of the present invention is as follows.
  • a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power A variable magnification optical system having a group,
  • the third lens group is composed of one single lens having a positive refractive power;
  • the zoom optical system satisfies the following conditional expression, Provided is a method for manufacturing a variable magnification optical system in which the distance between the lens groups changes at the time of variable magnification. 1.00 ⁇ ff / ( ⁇ fn) ⁇ 2.30
  • fn focal length of the second lens group
  • ff focal length of the third lens group
  • FIG. 1 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the first example.
  • 2 (a), 2 (b) and 2 (c) are respectively when an object at infinity is in focus in the wide-angle end state, the intermediate focal length state and the telephoto end state of the variable magnification optical system according to the first example.
  • FIG. 3 (a), 3 (b) and 3 (c) are respectively when focusing on a short-distance object in the wide-angle end state, intermediate focal length state and telephoto end state of the variable magnification optical system according to the first example.
  • FIG. FIG. 4 is a cross-sectional view showing the lens configuration of the variable magnification optical system according to the second example.
  • FIG. 5 (a), 5 (b) and 5 (c) are respectively when an object at infinity is in focus in the wide-angle end state, the intermediate focal length state and the telephoto end state of the variable magnification optical system according to the second example.
  • FIG. 6 (a), 6 (b) and 6 (c) are respectively when a short distance object is focused in the wide-angle end state, intermediate focal length state and telephoto end state of the variable magnification optical system according to the second example.
  • FIG. FIG. 7 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the third example.
  • FIGS. 9A, 9B, and 9C are diagrams for focusing a short distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example, respectively.
  • FIG. FIG. 10 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the fourth example.
  • FIG. 11 (a), 11 (b), and 11 (c), respectively, are focused on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fourth example.
  • FIG. 12 (a), 12 (b), and 12 (c), respectively, are those when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the fourth example.
  • FIG. FIG. 13 is a diagram showing a configuration of an example of a camera provided with a variable magnification optical system.
  • FIG. 14 is a diagram showing an outline of an example of a method for manufacturing a variable magnification optical system.
  • variable magnification optical system an optical apparatus, and a method for manufacturing the variable magnification optical system will be described.
  • variable magnification optical system includes a first lens group having a positive refractive power disposed closest to the object side, and a negative lens having a negative refractive power disposed closer to the image side than the first lens group.
  • the group consists of a single lens having positive refractive power.
  • a first lens group having a positive refractive power disposed closest to the object side a negative lens group having a negative refractive power disposed closer to the image side than the first lens group, and Having a vibration-proof group movable so as to include a component in a direction orthogonal to the optical axis, and disposed between a positive lens group having positive refractive power and the negative lens group and the positive lens group A focusing group, and at the time of zooming, the distance between the first lens group and the negative lens group changes, the distance between the negative lens group and the positive lens group changes, and in focusing, The distance between the focusing group and the lens arranged at the position facing the object side of the focusing group changes, and the lens arranged at the position facing the focusing group and the image side of the focusing group;
  • the focusing group is composed of one single lens having a positive refractive power.
  • the zoom optical system includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power.
  • a lens group and a fourth lens group having a positive refractive power, and at the time of zooming, the distance between the lens groups changes, and the third lens group is a single lens having a positive refractive power. It consists of a lens.
  • variable magnification optical system satisfies the following conditional expression (1).
  • (1) 1.00 ⁇ ff / ( ⁇ fn) ⁇ 2.30
  • fn focal length of the negative lens group (second lens group)
  • ff focal length of the focusing group (third lens group)
  • Conditional expression (1) defines the ratio between the focal length of the negative lens group (second lens group) and the focal length of the focusing group (third lens group).
  • conditional expression (1) when the corresponding value of conditional expression (1) is below the lower limit value, the refractive power of the focusing group (third lens group) increases. This is not preferable because it becomes difficult to correct spherical aberration and coma in the telephoto end state.
  • the lower limit value of conditional expression (1) is 1.40. In order to further secure the effect, it is preferable that the lower limit value of conditional expression (1) is 1.61.
  • the refractive power of the negative lens group increases. This is not preferable because correction of coma and astigmatism becomes difficult in the wide-angle end state.
  • the upper limit value of conditional expression (1) is 2.20. In order to make the effect more reliable, it is preferable that the upper limit value of the conditional expression (1) is 2.16.
  • variable magnification optical system with good optical performance can be realized.
  • the aberration fluctuation is large when focusing on a short distance object.
  • the conventional variable magnification optical system is configured to extend the first lens group having a large weight when focusing on a short-distance object, the load on the autofocus mechanism such as a motor is large.
  • the variable magnification optical system can suppress aberration fluctuations when focusing on a short-distance object.
  • the variable magnification optical system adopts an inner focus method and performs focusing with a small and lightweight lens, so that the burden on the autofocus mechanism is small.
  • variable magnification optical system can focus from an object at infinity to an object at a short distance by moving the third lens group along the optical axis. With this configuration, it is possible to satisfactorily correct aberration fluctuations during focusing.
  • the zoom optical system includes, in order from the object side, a first lens group having a positive refractive power and a second lens group having a negative refractive power. It is preferable that the distance between the first lens group and the second lens group changes and the following conditional expression (2) is satisfied. (2) 2.00 ⁇ f1 / ( ⁇ fn) ⁇ 4.00 However, f1: Focal length of the first lens group fn: Focal length of the second lens group
  • Conditional expression (2) defines the ratio between the focal length of the first lens group and the focal length of the second lens group.
  • variable magnification optical system when the corresponding value of the conditional expression (2) is lower than the lower limit value, the refractive power of the first lens unit is increased. This is not preferable because it becomes difficult to correct spherical aberration and longitudinal chromatic aberration in the telephoto end state.
  • the lower limit value of conditional expression (2) is 2.50.
  • the lower limit value of the conditional expression (2) is 2.85.
  • conditional expression (2) when the corresponding value of the conditional expression (2) exceeds the upper limit value, the refractive power of the second lens group increases. This is not preferable because correction of coma and astigmatism becomes difficult in the wide-angle end state.
  • the upper limit value of conditional expression (2) is 3.70. In order to make the effect more reliable, it is preferable that the upper limit value of conditional expression (2) is 3.63.
  • variable magnification optical system includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power. And a fourth lens group having a positive refractive power, and the distance between the first lens group and the second lens group changes during zooming, and the second lens group and the third lens The distance between the third lens group and the fourth lens group changes, and at least a part of the fourth lens group moves so as to include a component in a direction orthogonal to the optical axis. It is preferably possible. As a result, image blur due to camera shake, vibration, or the like can be corrected, that is, image stabilization can be achieved, and in particular, excellent optical performance can be achieved even during image stabilization while reducing the size of the lens barrel.
  • variable magnification optical system includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power. And a fourth lens group having a positive refractive power, and the distance between the first lens group and the second lens group changes during zooming, and the second lens group and the third lens It is preferable that the distance between the groups changes, the distance between the third lens group and the fourth lens group changes, and the following conditional expression (3) is satisfied.
  • (3) 0.10 ⁇ ff / fp ⁇ 0.90
  • ff focal length of the third lens group
  • fp focal length of the fourth lens group
  • Conditional expression (3) defines the ratio between the focal length of the third lens group and the focal length of the fourth lens group.
  • the variable magnification optical system can satisfactorily correct spherical aberration, coma and astigmatism in the telephoto end state by satisfying conditional expression (3).
  • conditional expression (3) when the corresponding value of conditional expression (3) is below the lower limit, the refractive power of the third lens unit increases. This is not preferable because it becomes difficult to correct spherical aberration and coma in the telephoto end state.
  • the lower limit value of conditional expression (3) is 0.20. In order to further secure the effect, it is preferable that the lower limit value of conditional expression (3) is 0.24.
  • variable magnification optical system when the corresponding value of the conditional expression (3) exceeds the upper limit value, the refractive power of the fourth lens group increases. This is not preferable because correction of coma and astigmatism becomes difficult in the telephoto end state.
  • variable magnification optical system includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power. And the distance between the first lens group and the second lens group changes, the distance between the second lens group and the third lens group changes, and the following conditions are satisfied: It is preferably possible to satisfy equation (4). (4) 60.00 ⁇ d3 However, ⁇ d3: Abbe number of a single lens included in the third lens group
  • Conditional expression (4) defines the Abbe number of a single lens in the third lens group.
  • conditional expression (4) In a variable magnification optical system, if the corresponding value of conditional expression (4) is less than the lower limit, it is not preferable because it is difficult to correct longitudinal chromatic aberration and spherical aberration in the telephoto end state. In order to secure the effect, it is preferable to set the lower limit value of conditional expression (4) to 63.00. In order to make the effect more reliable, it is preferable that the lower limit value of conditional expression (4) is 64.00.
  • the optical device includes a variable magnification optical system having the above-described configuration. Thereby, an optical device having good optical performance can be realized.
  • the zoom optical system manufacturing method includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a first lens group having a positive refractive power.
  • a variable magnification optical system manufacturing method having three lens groups and a fourth lens group having a positive refractive power, wherein the third lens group is composed of one single lens having a positive refractive power.
  • the zoom optical system satisfies the following conditional expression (1) so that the distance between the lens groups changes during zooming. Thereby, a variable magnification optical system having good optical performance can be manufactured.
  • (1) 1.00 ⁇ ff / ( ⁇ fn) ⁇ 2.30
  • fn focal length of the second lens group
  • ff focal length of the third lens group
  • FIG. 1 is a cross-sectional view of the variable magnification optical system according to the first example in the wide-angle end state. 1 and FIG. 4, FIG. 7 and FIG. 10, which will be described later, indicate the movement trajectory of each lens group during zooming from the wide-angle end state (W) to the telephoto end state (T).
  • variable magnification optical system includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens having a positive refractive power.
  • the lens group G3 includes a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a positive meniscus lens L11 having a convex surface facing the object side, and a cemented lens of a negative meniscus lens L12 having a convex surface facing the object side and a biconvex positive lens L13.
  • the second lens group G2 includes, in order from the object side, a cemented lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an aperture stop S, a cemented lens of a biconvex positive lens L41, a negative meniscus lens L42 having a convex surface on the image side, and a positive surface having a convex surface on the image side. It consists of a cemented lens of a meniscus lens L43 and a biconcave negative lens L44, a biconvex positive lens L45, and a negative meniscus lens L46 with a convex surface facing the image side.
  • the air gap between the first lens group G1 and the second lens group G2 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state is arranged along the optical axis so that the air gap between G2 and the third lens group G3 and the air gap between the third lens group G3 and the fourth lens group G4 are changed. Move each.
  • the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to an object at a short distance.
  • the image stabilization is achieved by moving the cemented lens of the positive meniscus lens L43 and the negative lens L44 in the fourth lens group G4 so as to include a component in a direction orthogonal to the optical axis. I do.
  • Table 1 below lists values of specifications of the variable magnification optical system according to the present example.
  • f represents the focal length
  • Bf represents the back focus (distance on the optical axis between the lens surface closest to the image side and the image plane I).
  • the surface number is the order of the optical surfaces counted from the object side
  • r is the radius of curvature
  • d is the surface interval (the interval between the nth surface (n is an integer) and the n + 1th surface)
  • nd is The refractive index for d-line (wavelength 587.6 nm) and ⁇ d indicate the Abbe number for d-line (wavelength 587.6 nm), respectively.
  • the object plane indicates the object plane
  • the variable indicates the variable plane spacing
  • the stop S indicates the aperture stop S
  • the image plane indicates the image plane I.
  • the radius of curvature r ⁇ indicates a plane.
  • FNO is the F number
  • ⁇ is the half angle of view (unit is “°”)
  • Y is the image height
  • TL is the total length of the variable magnification optical system according to the present embodiment (from the first surface to the image surface I).
  • Dn represents the variable distance between the nth surface and the (n + 1) th surface.
  • W represents the wide-angle end state
  • M represents the intermediate focal length state
  • T represents the telephoto end state.
  • d0 represents the distance from the object to the first surface.
  • [Lens Group Data] indicates the start surface and focal length of each lens group.
  • [Conditional Expression Corresponding Value] shows the corresponding value of each conditional expression of the variable magnification optical system according to the present example.
  • the focal length f, the radius of curvature r, and other length units listed in Table 1 are generally “mm”.
  • the optical system is not limited to this because an equivalent optical performance can be obtained even when proportionally enlarged or proportionally reduced.
  • symbol of Table 1 described above shall be similarly used also in the table
  • FIG. 2 (a), 2 (b) and 2 (c) are respectively when an object at infinity is in focus in the wide-angle end state, the intermediate focal length state and the telephoto end state of the variable magnification optical system according to the first example.
  • FIG. 3 (a), 3 (b) and 3 (c) are respectively when focusing on a short-distance object in the wide-angle end state, intermediate focal length state and telephoto end state of the variable magnification optical system according to the first example.
  • FNO represents the F number
  • Y represents the image height
  • NA represents the numerical aperture
  • the spherical aberration diagram shows the value of the F number FNO or the numerical aperture NA corresponding to the maximum aperture
  • the astigmatism diagram and the distortion diagram show the maximum value of the image height Y
  • the coma aberration diagram shows each image height. Indicates the value of.
  • d indicates the aberration at the d-line (wavelength 587.6 nm)
  • g indicates the aberration at the g-line (wavelength 435.8 nm).
  • the solid line indicates the sagittal image plane
  • the broken line indicates the meridional image plane.
  • the coma aberration diagram shows coma aberration at each image height Y. Note that the same reference numerals as in this embodiment are used in the aberration diagrams of each embodiment described later.
  • variable magnification optical system according to this example has various aberrations corrected satisfactorily and has excellent imaging performance.
  • FIG. 4 is a sectional view of the variable magnification optical system according to the second example in the wide-angle end state.
  • the variable magnification optical system according to the present example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens having a positive refractive power.
  • the lens group G3 includes a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface directed toward the object side and a biconvex positive lens L12.
  • the second lens group G2 includes, in order from the object side, a cemented lens of a biconvex positive lens L21 and a biconcave negative lens L22, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, an aperture stop S, a cemented lens of a biconvex positive lens L41, a negative meniscus lens L42 having a convex surface on the image side, and a positive surface having a convex surface on the image side. It consists of a cemented lens of a meniscus lens L43 and a biconcave negative lens L44, a biconvex positive lens L45, and a negative meniscus lens L46 with a convex surface facing the image side.
  • the air gap between the first lens group G1 and the second lens group G2 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state is arranged along the optical axis so that the air gap between G2 and the third lens group G3 and the air gap between the third lens group G3 and the fourth lens group G4 are changed. Move each.
  • the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to an object at a short distance.
  • the image stabilization is achieved by moving the cemented lens of the positive meniscus lens L43 and the negative lens L44 in the fourth lens group G4 so as to include a component in a direction orthogonal to the optical axis. I do.
  • Table 2 below provides values of specifications of the variable magnification optical system according to the present example.
  • FIG. 5 (a), 5 (b) and 5 (c) are respectively when an object at infinity is in focus in the wide-angle end state, the intermediate focal length state and the telephoto end state of the variable magnification optical system according to the second example.
  • FIG. 6 (a), 6 (b) and 6 (c) are respectively when a short distance object is focused in the wide-angle end state, intermediate focal length state and telephoto end state of the variable magnification optical system according to the second example.
  • variable magnification optical system according to the present example has various aberrations corrected satisfactorily and has excellent imaging performance.
  • FIG. 7 is a cross-sectional view of the zoom optical system according to the third example in the wide-angle end state.
  • the variable magnification optical system according to the present example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens having a positive refractive power.
  • the lens group G3 includes a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface directed toward the object side and a biconvex positive lens L12.
  • the second lens group G2 includes, in order from the object side, a cemented lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, a cemented lens of a biconvex positive lens L41 and a biconcave negative lens L42, an aperture stop S, and a positive meniscus lens L43 with a convex surface facing the image side. It consists of a cemented lens with a biconcave negative lens L44, a biconvex positive lens L45, a biconvex positive lens L46, and a biconcave negative lens L47.
  • the air gap between the first lens group G1 and the second lens group G2 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state is arranged along the optical axis so that the air gap between G2 and the third lens group G3 and the air gap between the third lens group G3 and the fourth lens group G4 are changed. Move each.
  • the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to an object at a short distance.
  • the image stabilization is achieved by moving the cemented lens of the positive meniscus lens L43 and the negative lens L44 in the fourth lens group G4 so as to include a component in a direction orthogonal to the optical axis. I do. Table 3 below lists values of specifications of the variable magnification optical system according to the present example.
  • FIGS. 8A, 8B, and 8C are respectively focused on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example.
  • FIGS. 9A, 9B, and 9C are diagrams for focusing a short distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example, respectively.
  • FIG. 9A, 9B, and 9C are diagrams for focusing a short distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example, respectively.
  • variable magnification optical system according to the present example has various aberrations corrected satisfactorily and has excellent imaging performance.
  • FIG. 10 is a sectional view of the zoom optical system according to the fourth example in the wide-angle end state.
  • the variable magnification optical system according to the present example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens having a positive refractive power.
  • the lens group G3 includes a fourth lens group G4 having a positive refractive power.
  • the first lens group G1 includes, in order from the object side, a positive meniscus lens L11 having a convex surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. It consists of a cemented lens.
  • the second lens group G2 includes, in order from the object side, a cemented lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
  • the third lens group G3 is composed of a biconvex positive lens L31.
  • the fourth lens group G4 includes, in order from the object side, a positive meniscus lens L41 having a convex surface directed toward the object side, a cemented lens of a biconvex positive lens L42 and a biconcave negative lens L43, an aperture stop S, A cemented lens of a positive meniscus lens L44 having a convex surface facing the image side and a biconcave negative lens L45, and a cemented lens of a negative meniscus lens L46 having a convex surface facing the object side and a biconvex positive lens L47; And a negative meniscus lens L48 having a convex surface directed toward the object side.
  • the air gap between the first lens group G1 and the second lens group G2 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state is arranged along the optical axis so that the air gap between G2 and the third lens group G3 and the air gap between the third lens group G3 and the fourth lens group G4 are changed. Move each.
  • the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to an object at a short distance.
  • the image stabilization is achieved by moving the cemented lens of the positive meniscus lens L44 and the negative lens L45 in the fourth lens group G4 so as to include a component in a direction perpendicular to the optical axis. I do. Table 4 below lists values of specifications of the variable magnification optical system according to the present example.
  • FIG. 11 (a), 11 (b), and 11 (c), respectively, are focused on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fourth example.
  • FIG. 12 (a), 12 (b), and 12 (c), respectively, are those when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the fourth example.
  • FIG. 12 (a), 12 (b), and 12 (c), respectively, are those when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the fourth example.
  • variable magnification optical system according to the present example has various aberrations corrected satisfactorily and has excellent imaging performance.
  • each of the above embodiments it is possible to realize a variable magnification optical system having a good optical performance while having an anti-vibration function.
  • each said Example has shown one specific example of this invention, and this invention is not limited to these. The following contents can be appropriately adopted as long as the optical performance of the variable magnification optical system is not impaired.
  • variable magnification optical system Although a four-group configuration is shown as a numerical example of the variable magnification optical system, the present application is not limited to this, and a variable magnification optical system of another group configuration (for example, five groups) can also be configured. Specifically, a configuration in which a lens or a lens group is added on the most object side or the most image side of the zoom optical system may be used.
  • the variable magnification optical system uses the third lens group consisting of one positive single lens as the focusing group (focusing lens group) on the optical axis in order to focus from an object at infinity to an object at a short distance. It is the structure moved along.
  • the above focusing group can also be applied to autofocus, and is also suitable for driving by an autofocus motor, such as an ultrasonic motor.
  • any lens group or a part thereof is moved as a vibration-proof lens group so as to include a component in a direction perpendicular to the optical axis, or an in-plane direction including the optical axis It can also be set as the structure which carries out anti-vibration by carrying out rotational movement (oscillation) to (F).
  • the lens surface of the lens constituting the variable magnification optical system may be a spherical surface, a flat surface, or an aspherical surface.
  • the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, there is little deterioration in drawing performance.
  • the lens surface is aspherical, any of aspherical surface by grinding, glass mold aspherical surface in which glass is molded into an aspherical shape, or composite aspherical surface in which resin provided on the glass surface is formed in an aspherical shape Good.
  • the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
  • GRIN lens gradient index lens
  • the aperture stop be disposed in the fourth lens group, and the role may be substituted by a lens frame without providing a member as the aperture stop. Further, an antireflection film having a high transmittance in a wide wavelength region may be provided on the lens surface of the lens constituting the variable magnification optical system. Thereby, flare and ghost can be reduced, and high optical performance with high contrast can be achieved.
  • FIG. 13 is a diagram illustrating a configuration of an example of a camera including a variable magnification optical system.
  • the camera 1 is a so-called mirrorless camera of an interchangeable lens type that includes the variable magnification optical system according to the first example as the photographing lens 2.
  • the camera 1 In the camera 1, light from an object (not shown) that is not shown is collected by the taking lens 2, and passes through an OLPF (Optical Low Pass Filter) that is not shown on the imaging surface of the imaging unit 3. Form a subject image. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject. This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1. Thus, the photographer can observe the subject via the EVF 4. When the release button (not shown) is pressed by the photographer, the subject image generated by the imaging unit 3 is stored in a memory (not shown). In this way, the photographer can shoot the subject with the camera 1.
  • OLPF Optical Low Pass Filter
  • variable magnification optical system according to the first embodiment mounted on the camera 1 as the photographing lens 2 has good optical performance. That is, the camera 1 can realize good optical performance. Even if a camera equipped with the variable magnification optical system according to the second to fourth embodiments as the photographing lens 2 is configured, the same effect as the camera 1 can be obtained. Further, even when the variable magnification optical system according to each of the above embodiments is mounted on a single-lens reflex camera that has a quick return mirror and observes a subject with a finder optical system, the same effect as the camera 1 can be obtained. it can.
  • FIG. 14 is a diagram showing an outline of a manufacturing method of the variable magnification optical system.
  • the zoom optical system manufacturing method shown in FIG. 14 includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power.
  • a method for manufacturing a variable magnification optical system having a lens group and a fourth lens group having a positive refractive power includes the following steps S1 to S3.
  • Step S1 First to fourth lens groups are prepared, and the third lens group is made of one single lens having a positive refractive power. Then, each lens group is arranged in the lens barrel in order from the object side.
  • Step S2 The variable magnification optical system is made to satisfy the following conditional expression (1).
  • (1) 1.00 ⁇ ff / ( ⁇ fn) ⁇ 2.30
  • fn focal length of the second lens group
  • ff focal length of the third lens group
  • Step S3 A known moving mechanism is provided in the lens barrel so that the distance between the lens groups changes during zooming.
  • variable magnification optical system having good optical performance can be manufactured.
  • G1 First lens group G2 Second lens group (negative lens group) G3 Third lens group (focusing group) G4 4th lens group (positive lens group) S aperture stop I image plane W wide-angle end state T telephoto end state

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Lenses (AREA)

Abstract

La présente invention porte sur un système optique à grossissement variable qui comprend un premier groupe de lentilles (G1) qui est disposé le plus vers un côté objet et a une réfringence positive, un groupe de lentilles négatives (G2) qui est disposé plus vers un côté image que le premier groupe de lentilles et a une réfringence négative, un groupe de lentilles positives (G4) qui est disposé plus vers le côté image que le groupe de lentilles négatives et a une réfringence positive, et un groupe de mise au point (G3) qui est disposé entre le groupe de lentilles négatives et le groupe de lentilles positives, dans lequel : lorsque le grossissement est modifié, l'espace entre le premier groupe de lentilles et le groupe de lentilles négatives change, et l'espace entre le groupe de lentilles négatives et le groupe de lentilles positives change; pendant la mise au point, l'espace entre le groupe de mise au point et une lentille qui est disposée dans une position faisant face au côté objet du groupe de mise au point change, et l'espace entre le groupe de mise au point et une lentille qui est disposée dans une position faisant face au côté image du groupe de mise au point change; et le groupe de mise au point comprend une lentille unique (L31) ayant une réfringence positive et satisfait une expression conditionnelle prescrite.
PCT/JP2015/086410 2014-12-26 2015-12-25 Système optique à grossissement variable, dispositif optique, et procédé de production de système optique à grossissement variable WO2016104786A1 (fr)

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JP2020115231A (ja) * 2015-09-18 2020-07-30 株式会社ニコン 変倍光学系、光学装置、撮像装置、変倍光学系の製造方法
CN113156615A (zh) * 2021-04-26 2021-07-23 惠州萨至德光电科技有限公司 一种八片式大光圈成像镜头

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