WO2022085208A1 - 光学系、光学機器および光学系の製造方法 - Google Patents

光学系、光学機器および光学系の製造方法 Download PDF

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Publication number
WO2022085208A1
WO2022085208A1 PCT/JP2021/000726 JP2021000726W WO2022085208A1 WO 2022085208 A1 WO2022085208 A1 WO 2022085208A1 JP 2021000726 W JP2021000726 W JP 2021000726W WO 2022085208 A1 WO2022085208 A1 WO 2022085208A1
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Prior art keywords
lens
optical system
conditional expression
present
following conditional
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PCT/JP2021/000726
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English (en)
French (fr)
Japanese (ja)
Inventor
真美 村谷
拓 松尾
哲史 三輪
陽子 小松原
晶乃 近藤
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Nikon Corp
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Nikon Corp
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Priority to US17/917,551 priority Critical patent/US12360340B2/en
Priority to JP2022556375A priority patent/JP7306587B2/ja
Priority to CN202180019804.4A priority patent/CN115244444B/zh
Priority to CN202410351431.6A priority patent/CN118112768A/zh
Publication of WO2022085208A1 publication Critical patent/WO2022085208A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/12—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having three components only
    • 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
    • G02B15/143—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 three groups only
    • G02B15/1431—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 three groups only the first group being positive
    • G02B15/143101—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 three groups only the first group being positive arranged +--
    • 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
    • G02B15/143—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 three groups only
    • G02B15/1431—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 three groups only the first group being positive
    • G02B15/143103—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 three groups only the first group being positive arranged ++-
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/64—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having more than six components

Definitions

  • the present invention relates to an optical system, an optical device, and a method for manufacturing the optical system.
  • the optical system of the present disclosure has a plurality of lens groups, and the plurality of lens groups are the final lenses arranged on the image side of the plurality of lens groups because the distance between the lens groups changes at the time of focusing.
  • the group has at least one lens surface having poles and satisfies all of the following conditional equations. 0.020 ⁇ Y / f ⁇ 0.120 0.010 ⁇ Bf / TL ⁇ 0.150 however, Y: Image height f: Focal length of the optical system TL: Total optical length of the optical system Bf: Back focus of the optical system
  • the method for manufacturing an optical system according to the present disclosure is a method for manufacturing an optical system composed of a plurality of lens groups.
  • the distance between the lens groups changes during focusing
  • the final lens group arranged on the image side has at least one lens surface having a pole point, and is arranged so as to satisfy all of the following conditional expressions. 0.020 ⁇ Y / f ⁇ 0.120 0.010 ⁇ Bf / TL ⁇ 0.150 however, Y: Image height f: Focal length of the optical system TL: Total optical length of the optical system Bf: Back focus of the optical system
  • the optical system of the present embodiment has a plurality of lens groups, and the distance between the plurality of lens groups changes at the time of focusing, and the final lens group is arranged on the image side of the plurality of lens groups.
  • the lens group has at least one lens surface having pole points, and all of the following conditional expressions are satisfied.
  • the pole point means a point on the lens surface other than the optical axis where the tangent plane of the lens surface intersects the optical axis perpendicularly.
  • the optical system of the present embodiment can effectively suppress various on-axis and off-axis aberrations by having a lens surface having a pole in the final lens group.
  • the optical system of the present embodiment can satisfactorily correct off-axis aberrations such as coma with respect to the image height by making the value of the conditional expression (1) smaller than the upper limit value.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (1) to 0.120.
  • the upper limit of the conditional expression (1) is set to 0.110, 0.100, 0.095, 0.090, 0.085, 0.080, 0. It is preferably set to 075, 0.070, 0.065, 0.063, 0.060, and further 0.058.
  • the optical system of the present embodiment can satisfactorily correct chromatic aberration at an appropriate focal length by making the value of the conditional expression (1) larger than the lower limit value.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (1) to 0.020. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit values of the conditional expression (1) to 0.025, 0.028, 0.030, 0.033, and further 0.035. ..
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (2) to 0.150. Further, in order to further ensure the effect of the present embodiment, the upper limit values of the conditional expression (2) are set to 0.120, 0.100, 0.090, 0.085, 0.080, and further 0.075. It is preferable to do so.
  • the optical system of the present embodiment can satisfactorily correct off-axis aberrations such as coma by making the value of the conditional expression (2) larger than the lower limit value.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (2) to 0.010. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit of the conditional expression (2) to 0.013, 0.015, 0.018, 0.020, and further 0.022. ..
  • At least one of the lens surfaces having poles satisfies the following conditional expression. (3) 0.02 ⁇ h / Y ⁇ 1.20 however, h: The height of the pole closest to the optical axis on the lens surface having the pole from the optical axis.
  • the optical system of the present embodiment can correct axial aberrations and off-axis aberrations such as coma, distortion, and curvature of field in a well-balanced manner.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (3) to 1.20. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit values of the conditional expression (3) to 1.15, 1.10, 1.05, 1.00, and further 0.95. ..
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (3) to 0.02. Further, in order to further ensure the effect of the present embodiment, the lower limit values of the conditional expression (3) are set to 0.05, 0.10, 0.25, 0.30, 0.35, 0.40, 0. It is preferably set to 45 and further to 0.50.
  • the optical system of the present embodiment has one or more positive lenses having a lens surface having poles and having a positive refractive power, and at least one of the one or more positive lenses is as follows. It is preferable to satisfy the conditional expression. (4) -1 -0.15 ⁇ (Dh-Dc) / rK ⁇ 0.00 however, Dh: Thickness on the optical axis of a lens having a lens surface having a pole point Dc: Thickness on the pole point of a lens having a lens surface having a pole point rK: Effective radius of a lens having a lens surface having a pole point
  • the optical system of the present embodiment can satisfactorily correct the curvature of field and appropriately control the position of the exit pupil.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (4) -1 to 0.00. Further, in order to further ensure the effect of the present embodiment, the upper limit of the conditional expression (4) -1 is set to ⁇ 0.03, ⁇ 0.05, ⁇ 0.08, and further ⁇ 0.10. Is preferable.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (4) -1 to ⁇ 0.15. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit value of the conditional expression (4) -1 to ⁇ 0.13.
  • the optical system of the present embodiment has one or more negative lenses having a lens surface having poles and having a negative refractive power, and at least one of the one or more negative lenses is as follows. It is preferable to satisfy the conditional expression. (4) -2 0.000 ⁇ (Dh-Dc) / rK ⁇ 0.100 however, Dh: Thickness on the optical axis of a lens having a lens surface having a pole point Dc: Thickness on the pole point of a lens having a lens surface having a pole point rK: Effective radius of a lens having a lens surface having a pole point
  • the optical system of the present embodiment can satisfactorily correct the curvature of field and appropriately control the position of the exit pupil.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (4) -2 to 0.100. Further, in order to further ensure the effect of the present embodiment, the upper limit of the conditional expression (4) -2 is set to 0.095, 0.090, 0.085, 0.080, and further 0.075. Is preferable.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (4) -2 to 0.000. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit of the conditional expression (4) -2 to 0.003 and further to 0.005.
  • the optical system of the present embodiment preferably satisfies the following conditional expression. (5) 0.020 ⁇ KML / TL ⁇ 0.140 however, KML: Distance from the lens plane with the pole closest to the image plane to the image plane
  • the curvature of field can be satisfactorily corrected by making the value of the conditional expression (5) smaller than the upper limit value.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (5) to 0.140. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit values of the conditional expression (5) to 0.135, 0.130, 0.125, 0.120, and further 0.118. ..
  • the decrease in the amount of peripheral light can be suppressed by making the value of the conditional expression (5) larger than the lower limit value.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (5) to 0.020.
  • the lower limit values of the conditional expression (5) are set to 0.025, 0.030, 0.035, 0.040, 0.045, 0.050, and further 0. It is preferable to set it to 0.055.
  • At least one of the lenses having a lens surface having a pole point satisfies the following conditional expression. (6) 0.70 ⁇ rK / Y ⁇ 1.10 however, rK: Effective radius of a lens having a lens surface with poles
  • the optical system of the present embodiment can satisfactorily correct off-axis aberrations such as coma, distortion, and curvature of field by satisfying the conditional expression (6).
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (6) to 1.10. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit values of the conditional expression (6) to 1.05, 1.00, 0.98, and further 0.95.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (6) to 0.70. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit values of the conditional expression (6) to 0.73, 0.75, 0.78, 0.80, and further 0.82. ..
  • At least one of the lenses having a lens surface having a pole point satisfies the following conditional expression. (7) -0.40 ⁇ Bf / fK ⁇ 0.40 however, fK: Focal length of a lens having a lens surface having extreme points
  • the optical system of the present embodiment can appropriately control the position of the exit pupil and satisfactorily correct the curvature of field.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (7) to 0.40. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit values of the conditional expression (7) to 0.38, 0.35, 0.33, and further 0.30.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (7) to ⁇ 0.40.
  • the lower limit values of the conditional expression (7) are set to ⁇ 0.35, ⁇ 0.30, ⁇ 0.25, ⁇ 0.20, ⁇ 0.15, and further. It is preferably set to ⁇ 0.10.
  • At least one of the lenses having a lens surface having a pole point satisfies the following conditional expression. (8) 25.00 ⁇ dK ⁇ 70.00 however, ⁇ dK: Abbe number based on the d-line of a lens having a lens surface with poles
  • the optical system of this embodiment can satisfactorily correct chromatic aberration by satisfying the conditional expression (8).
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (8) to 70.00. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit values of the conditional expression (8) to 68.00, 66.00, and further to 65.00.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (8) to 25.00. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit of the conditional expression (8) to 30.00, 35.00, 38.00, 40.00, and further to 42.00. ..
  • At least one of the lenses having a lens surface having a pole point satisfies the following conditional expression. (9) -1.00 ⁇ fR / fK ⁇ 0.60 however, fR: Focal length of the final lens group fK: Focal length of a lens having a lens surface with poles
  • the optical system of the present embodiment can appropriately control the position of the exit pupil and satisfactorily correct the curvature of field.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (9) to 0.60. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (9) to 0.55, 0.50, 0.45, 0.40, and further to 0.35. ..
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (9) to ⁇ 1.00. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit values of the conditional expression (9) to ⁇ 0.98, ⁇ 0.95, ⁇ 0.93, and further ⁇ 0.90. ..
  • the optical system of the present embodiment preferably satisfies the following conditional expression. (10) -0.50 ⁇ Bf / rR ⁇ 0.20 however, rR: Radius of curvature of the lens surface placed closest to the image side
  • the optical system of the present embodiment can appropriately control the position of the exit pupil and satisfactorily correct the curvature of field.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (10) to 0.20. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit values of the conditional expression (10) to 0.15, 0.10, 0.05, and further 0.02.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (10) to ⁇ 0.50. Further, in order to further ensure the effect of the present embodiment, the lower limit of the conditional expression (10) is set to -0.48, -0.45, -0.43, -0.40, -0.38, and further. It is preferable to set it to ⁇ 0.35.
  • At least one of the lenses having a lens surface having a pole point satisfies the following conditional expression. (11) -2.00 ⁇ fK / f ⁇ 0.50 however, fK: Focal length of a lens having a lens surface having extreme points
  • the optical system of the present embodiment can correct axial aberrations and off-axis aberrations such as coma aberration, distortion, and curvature of field in a well-balanced manner.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (11) to 0.50. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (11) to 0.45, 0.40, 0.35, 0.30, and further 0.28. ..
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (11) to ⁇ 2.00. Further, in order to further ensure the effect of this embodiment, the lower limit values of the conditional expression (11) are set to -1.95, -1.90, -1.85, -1.80, and further -1.75. It is preferable to set it.
  • optical system of the present embodiment preferably satisfies the following conditional expression. (12) 0.20 ⁇ TL / f ⁇ 1.10
  • the size of the optical system can be avoided by making the value of the conditional expression (12) smaller than the upper limit value.
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (12) to 1.10. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit values of the conditional expression (12) to 1.08, 1.05, 1.03, and further to 1.00.
  • various aberrations can be satisfactorily corrected by making the value of the conditional expression (12) larger than the lower limit value.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (12) to 0.20.
  • the lower limit values of the conditional expression (12) are set to 0.25, 0.30, 0.35, 0.40, 0.43, and further 0.45. It is preferable to do so.
  • optical system of the present embodiment preferably satisfies the following conditional expression. (13) 0.005 ⁇ Bf / f ⁇ 0.100
  • the effect of the present embodiment can be further ensured by setting the upper limit value of the conditional expression (13) to 0.100. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit of the conditional expression (13) to 0.095, 0.090, 0.085, 0.080, and further 0.075. ..
  • the position of the exit pupil does not come too close to the image plane, and off-axis aberrations such as coma are satisfactorily corrected. be able to.
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (13) to 0.005. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit values of the conditional expression (13) to 0.008, 0.010, 0.013, and further 0.015.
  • the optical system of the present embodiment has at least one lens Z that satisfies all of the following conditional expressions.
  • ndLZ Refraction coefficient of lens Z with respect to d-line
  • ⁇ dLZ Abbe number ⁇ gFLZ with reference to d-line of lens Z: Partial dispersion ratio of lens Z.
  • ⁇ gFLZ (ngLZ ⁇ nFLZ) / (nFLZ ⁇ nCLZ) defined by the following equation.
  • the optical system of the present embodiment can satisfactorily correct various aberrations.
  • the value of the conditional expression (14) by making the value of the conditional expression (14) smaller than the upper limit value, the Petzval sum does not become too small, and the curvature of field can be satisfactorily corrected. Further, by setting the upper limit value of the conditional expression (14) to 2.12, the effect of the present embodiment can be further ensured. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit value of the conditional expression (14) to 2.10 and further to 2.08.
  • the optical system of the present embodiment can satisfactorily correct the secondary dispersion of axial chromatic aberration by making the value of the conditional expression (15) smaller than the upper limit value. Further, by setting the upper limit value of the conditional expression (15) to 35.00, the effect of the present embodiment can be further ensured. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the upper limit values of the conditional expression (15) to 33.50, 32.50, 31.00, 30.00, and further 28.50.
  • the optical system of the present embodiment can satisfactorily correct the secondary dispersion of axial chromatic aberration by making the value of the conditional expression (16) larger than the lower limit value. Further, by setting the lower limit value of the conditional expression (16) to 0.702, the effect of the present embodiment can be further ensured. Further, in order to further ensure the effect of the present embodiment, the upper limit values of the conditional expression (17) are set to 0.705, 0.708, 0.710, 0.712, 0.714, and further 0.716. Is preferable.
  • the optical system of the present embodiment has at least one lens X that satisfies the following conditional expression. (18) 80.00 ⁇ dLX however, ⁇ dLX: Abbe number based on the d line of lens X
  • the optical system of the present embodiment can satisfactorily correct chromatic aberration by having the lens X satisfying the conditional expression (18).
  • the effect of the present embodiment can be further ensured by setting the lower limit value of the conditional expression (18) to 80.00. Further, in order to further ensure the effect of the present embodiment, it is preferable to set the lower limit of the conditional expression (18) to 83.00, 85.00, 88.00, 90.00, and further 92.50.
  • the lens group arranged on the object side most has a positive refractive power.
  • the optical device of this embodiment has an optical system having the above-mentioned configuration. This makes it possible to realize an optical device that is small in size and has good imaging performance.
  • the method for manufacturing an optical system is a method for manufacturing an optical system composed of a plurality of lens groups.
  • the distance between the lens groups changes at the time of focusing
  • the plurality of lens groups Of these, the final lens group arranged on the image side has at least one lens surface having a pole point, and is arranged so as to satisfy all of the following conditional expressions.
  • Bf Back focus of the optical system
  • FIG. 1 is a cross-sectional view of an optical system of the first embodiment when focusing on an infinity object.
  • a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a third lens group G3 having a negative refractive power in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a third lens group G3 having a negative refractive power. And have.
  • the first lens group G1 includes a biconvex positive lens L1, a positive meniscus lens L2 with a convex surface facing the object side, a biconvex positive lens L3, and a biconcave negative lens L4 in order from the object side.
  • the lens is composed of a biconvex positive lens L5, a biconcave negative lens L6, and a biconvex positive lens L7.
  • the second lens group G2 is composed of a positive meniscus lens L8 with a convex surface facing the object side.
  • the third lens group G3 includes a junction negative lens of a biconvex positive lens L9 and a biconcave negative lens L10, an aperture aperture S, and a positive meniscus lens L11 with a convex surface facing the image side, in order from the object side.
  • An image sensor (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
  • a filter FL1 is arranged between the optical system of this embodiment and the image plane I.
  • the optical system of this embodiment focuses by moving the second lens group G2 along the optical axis.
  • the second lens group G2 is moved from the image side to the object side when focusing on a short-distance object from the state of being in focus at infinity.
  • the junction negative lens of the positive meniscus lens L11 and the negative lens L12 and the negative lens L13 are perpendicular to the optical axis in order to correct the image blur. It is configured as a group of anti-vibration lenses that can be moved so as to have a directional component.
  • the lens surface on the object side of the positive meniscus lens L17 and the lens surface on the image side of the negative meniscus lens L18 included in the third lens group G3 have polar points.
  • the positive meniscus lens L17 corresponds to a positive lens having a lens surface having a pole and having a positive refractive power.
  • the positive lens L5 corresponds to the lens Z
  • the positive meniscus lens L2 and the positive lens L3 correspond to the lens X.
  • Table 1 below lists the values of the specifications of the optical system of this embodiment.
  • f is the focal length of the optical system in infinity focus
  • Fno is the F value of the optical system in infinity focus
  • TL is the total optical length of the optical system in infinity focus
  • Bf is the optical system. Indicates the back focus of.
  • m is the order of the optical planes counted from the object side
  • r is the radius of curvature
  • d is the plane spacing
  • nd is the refractive index for the d line (wavelength 587.6 nm)
  • ⁇ d is the Abbe number for the d line. show.
  • the radius of curvature r ⁇ indicates a plane.
  • the optical surface marked with "*" indicates that it is an aspherical surface.
  • ASP indicates the optical surface corresponding to the aspherical data
  • K indicates the conical constant
  • A4 to A20 indicate the spherical constant.
  • the height in the direction perpendicular to the optical axis is y
  • the distance (sag amount) along the optical axis from the tangent plane of the apex of each aspherical surface to each aspherical surface at the height y is S (y).
  • the radius of curvature (near-axis radius of curvature) of the reference sphere is r
  • the conical constant is K
  • the nth-order aspherical coefficient is An
  • the unit of focal length f, radius of curvature r and other lengths shown in Table 1 is "mm".
  • the optical system is not limited to this because the same optical performance can be obtained even if the optical system is proportionally expanded or contracted.
  • FIG. 2A is an aberration diagram of the optical system of the first embodiment when the object is in focus at infinity
  • FIG. 2B is an aberration diagram of the optical system of the first embodiment when the object is in focus at a short distance.
  • FNO indicates F value and Y indicates image height.
  • the spherical aberration diagram shows the value of the F value corresponding to the maximum aperture
  • the astigmatism diagram and the distortion diagram show the maximum image height value
  • the coma aberration diagram shows the value of each image height.
  • d is the d line
  • g is the g line (wavelength 435.8 nm).
  • the solid line shows the sagittal image plane and the broken line shows the meridional image plane.
  • the same reference numerals as those of the various aberration diagrams of this embodiment are used.
  • the optical system of this embodiment effectively suppresses aberration fluctuations during focusing and has high optical performance.
  • FIG. 3 is a cross-sectional view of the optical system of the second embodiment when the object at infinity is in focus.
  • a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a third lens group G3 having a negative refractive power in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a positive refractive power, and a third lens group G3 having a negative refractive power. And have.
  • the first lens group G1 includes a positive meniscus lens L1 having a convex surface facing the object side, a biconvex positive lens L2, a biconvex positive lens L3, and a biconcave negative lens L4 in order from the object side. It is composed of a biconvex positive lens L5, a biconcave negative lens L6, and a junction negative lens of a positive meniscus lens L7 having a convex surface facing the object side.
  • the second lens group G2 is composed of a biconvex positive lens L8.
  • the third lens group G3 is a junction negative lens of a positive meniscus lens L9 having a convex surface facing the object side, an aperture aperture S, a biconvex positive lens L10, and a biconcave negative lens L11 in order from the object side.
  • An image sensor (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
  • Filters FL1 and FL2 are arranged between the optical system of this embodiment and the image plane I.
  • the optical system of this embodiment focuses by moving the second lens group G2 along the optical axis.
  • the second lens group G2 is moved from the image side to the object side when focusing on a short-distance object from the state of being in focus at infinity.
  • the lens surface on the object side of the negative lens L18 included in the third lens group G3 has a pole.
  • the negative lens L18 corresponds to a lens having a lens surface having a pole and a negative lens having a negative refractive power.
  • the positive lens L5 corresponds to the lens Z
  • the positive lens L2 and the positive lens L3 correspond to the lens X.
  • Table 2 below lists the values of the specifications of the optical system of this embodiment.
  • FIG. 4A is an aberration diagram of the optical system of the second embodiment when the object is in focus at infinity
  • FIG. 4B is an aberration diagram of the optical system of the second embodiment when the object is in focus at a short distance.
  • the optical system of this embodiment effectively suppresses aberration fluctuations during focusing and has high optical performance.
  • FIG. 5 is a cross-sectional view of the optical system of the third embodiment when the object at infinity is in focus.
  • a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group G3 having a negative refractive power 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 group G3 having a negative refractive power. And have.
  • the aperture stop S is arranged between the first lens group G1 and the second lens group G2.
  • the first lens group G1 includes a positive meniscus lens L1 having a convex surface facing the object side, a regular meniscus lens L2 having a convex surface facing the object side, and a lens surface facing the convex surface toward the object side in order from the object side.
  • It is composed of a positive meniscus lens L6 having a convex surface facing the object side, a negative meniscus lens L7 having a convex surface facing the object side, and a positive meniscus lens L8 having a convex surface facing the object side.
  • the second lens group G2 is composed of a biconcave negative lens L9.
  • the third lens group G3 is a junction positive lens of a negative meniscus lens L10 having a convex surface facing the object side and a biconvex positive lens L11, and a biconvex positive lens L12 and a biconcave shape in order from the object side.
  • An image sensor (not shown) composed of a CCD, CMOS, or the like is arranged on the image plane I.
  • the optical system of this embodiment focuses by moving the second lens group G2 along the optical axis.
  • the second lens group G2 is moved from the object side to the image side when focusing on a short-distance object from the state of being in focus at infinity.
  • the negative lens and the negative lens L14 which are the junctions of the positive lens L12 and the negative lens L13, are in the direction perpendicular to the optical axis in order to correct the image blur. It is configured as a group of anti-vibration lenses that can be moved so as to have the components of.
  • the lens surfaces of the negative meniscus lens L21 included in the third lens group G3 on the object side and the image side have poles.
  • the negative meniscus lens L21 corresponds to a lens having a lens surface having a pole and a negative lens having a negative refractive power.
  • the positive meniscus lens L8 corresponds to the lens Z.
  • Table 3 below lists the values of the specifications of the optical system of this embodiment.
  • [Diffraction optical surface data] shows n (order of diffracted light), ⁇ 0 (design wavelength), and C2 to C4 (phase coefficient) in the following equation (b) representing the phase shape ⁇ of the diffracted optical surface.
  • FIG. 6A is an aberration diagram of the optical system of the third embodiment when the object is in focus at infinity
  • FIG. 6B is an aberration diagram of the optical system of the third embodiment when the object is in focus at a short distance.
  • the optical system of this embodiment effectively suppresses aberration fluctuations during focusing and has high optical performance.
  • Y is the image height
  • f is the focal length of the optical system
  • TL is the total optical length of the optical system
  • Bf is the back focus of the optical system.
  • h is the height from the optical axis of the pole closest to the optical axis on the lens surface having the pole.
  • Dh is the thickness on the optical axis of the lens having the lens surface having the poles
  • Dc is the thickness on the poles of the lens having the lens surface having the poles
  • rK is the thickness on the poles of the lens having the lens surface having the poles. The effective radius.
  • KML is the distance from the lens plane with the pole closest to the image plane to the image plane.
  • fK is the focal length of a lens having a lens surface with poles.
  • ⁇ dK is an Abbe number based on the d-line of a lens having a lens surface having poles.
  • fR is the focal length of the final lens group.
  • rR is the radius of curvature of the lens surface placed closest to the image side.
  • ndLZ is the refractive index of the lens Z with respect to the d-line
  • ⁇ gFLZ is the partial dispersion ratio of the lens Z
  • the refractive index of the lens Z with respect to the g-line is ngLZ
  • the refractive index of the lens Z with respect to the F-line is nFLZ
  • ⁇ dLX is an Abbe number based on the d line of lens X.
  • an antireflection film having a high transmittance in a wide wavelength range may be applied to the lens surface of the lens constituting the optical system of each of the above embodiments.
  • flare and ghost can be reduced, and high-contrast optical performance can be achieved.
  • FIG. 23 is a schematic diagram of a camera provided with the optical system of the present embodiment.
  • the camera 1 is a so-called mirrorless camera with an interchangeable lens equipped with the optical system according to the first embodiment as the photographing lens 2.
  • the light from an object (subject) (not shown) is collected by the photographing lens 2 and reaches the image sensor 3.
  • the image sensor 3 converts the light from the subject into image data.
  • the image data is displayed on the electronic viewfinder 4. As a result, the photographer whose eyes are positioned at the eye point EP can observe the subject.
  • the image data is stored in the memory (not shown). In this way, the photographer can shoot the subject with the camera 1.
  • the optical system of the first embodiment mounted on the camera 1 as the photographing lens 2 is an optical system that is compact and has good optical performance. Therefore, the camera 1 is small and can realize good optical performance. Even if a camera equipped with the optical system of the second to third embodiments as the photographing lens 2 is configured, the same effect as that of the camera 1 can be obtained.
  • FIG. 8 is a flowchart showing an outline of the manufacturing method of the optical system of the present embodiment.
  • the method for manufacturing an optical system according to the present embodiment shown in FIG. 8 is a method for manufacturing an optical system including a plurality of lens groups, and includes the following steps S1 to S4.
  • Step S1 Prepare a plurality of lens groups.
  • Step S2 Make the distance between each lens group change when focusing.
  • Step S3 The final lens group arranged on the image side of the plurality of lens groups has at least one lens surface having extreme points.
  • Step S3 Make the optical system satisfy all of the following conditional expressions. (1) 0.020 ⁇ Y / f ⁇ 0.120 (2) 0.010 ⁇ Bf / TL ⁇ 0.150 however, Y: Image height f: Focal length of the optical system TL: Total optical length of the optical system Bf: Back focus of the optical system

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PCT/JP2021/000726 2020-10-22 2021-01-12 光学系、光学機器および光学系の製造方法 Ceased WO2022085208A1 (ja)

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