WO2022097401A1 - 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
WO2022097401A1
WO2022097401A1 PCT/JP2021/036577 JP2021036577W WO2022097401A1 WO 2022097401 A1 WO2022097401 A1 WO 2022097401A1 JP 2021036577 W JP2021036577 W JP 2021036577W WO 2022097401 A1 WO2022097401 A1 WO 2022097401A1
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Prior art keywords
lens group
lens
optical system
negative
conditional expression
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PCT/JP2021/036577
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English (en)
French (fr)
Japanese (ja)
Inventor
知憲 栗林
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Nikon Corp
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Nikon Corp
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Priority to JP2022560679A priority Critical patent/JP7459968B2/ja
Priority to US18/030,272 priority patent/US20230375802A1/en
Priority to CN202511925232.2A priority patent/CN121634469A/zh
Priority to CN202180065897.4A priority patent/CN116209936B/zh
Publication of WO2022097401A1 publication Critical patent/WO2022097401A1/ja
Anticipated expiration legal-status Critical
Priority to JP2024036624A priority patent/JP7722493B2/ja
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    • 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 -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only
    • 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
    • G02B15/144105—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 +-+-
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • 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

Definitions

  • the present invention relates to an optical system, an optical device, and a method for manufacturing the optical system.
  • the first optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refraction, which are arranged in order from the object side along the optical axis. It has a third lens group having a force and a fourth lens group having a negative refractive power, and at the time of focusing, the second lens group and the third lens group move along the optical axis.
  • the distance between adjacent lens groups changes, and the following conditional expression is satisfied. 0.20 ⁇ DG4 / TL ⁇ 0.40
  • DG4 the length on the optical axis of the fourth lens group TL: the total length of the optical system in the infinity in-focus state.
  • the second optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refraction, which are arranged in order from the object side along the optical axis. It has a third lens group having a force and a fourth lens group having a negative refractive power, and at the time of focusing, the second lens group and the third lens group move along the optical axis.
  • the distance between adjacent lens groups changes, and the following conditional expression is satisfied.
  • LnR1 radius of curvature of the lens surface on the object side in the negative lens arranged on the most image side of the optical system
  • LnR2 radius of curvature of the lens surface on the image side in the negative lens arranged on the most image side of the optical system.
  • the third optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refraction, which are arranged in order from the object side along the optical axis. It has a third lens group having a force and a fourth lens group having a negative refractive power, and at the time of focusing, the second lens group and the third lens group move along the optical axis.
  • the distance between adjacent lens groups changes, and the following conditional expression is satisfied. 0.75 ⁇ f1 / (-f2) ⁇ 1.30
  • f1 the focal length of the first lens group
  • f2 the focal length of the second lens group.
  • the fourth optical system includes a first lens group having a positive refractive force, a second lens group having a negative refractive force, and a positive refraction, which are arranged in order from the object side along the optical axis. It has a third lens group having a force and a fourth lens group having a negative refractive force, and at the time of focusing, the second lens group and the third lens group move along the optical axis. The distance between adjacent lens groups changes, and the first lens group has a negative lens that satisfies the following conditional expression.
  • ndM1 the refractive index of the negative lens of the first lens group with respect to the d line
  • ⁇ dM1 the abbe number of the negative lens of the first lens group
  • ⁇ gFM1 the partial dispersion ratio of the negative lens of the first lens group.
  • the refractive index of the negative lens of the first lens group with respect to the g line is ngM1
  • the refractive index of the negative lens of the first lens group with respect to the F line is nFM1
  • C of the negative lens of the first lens group is the refractive index for a line.
  • ⁇ gFM1 (ngM1-nFM1) / (nFM1-nCM1) defined by the following equation.
  • the optical device according to the present invention is configured to include the above optical system.
  • the first method for manufacturing an optical system according to the present invention includes a first lens group having a positive refractive force and a second lens group having a negative refractive force arranged in order from the object side along the optical axis. It is a method of manufacturing an optical system having a third lens group having a positive refractive force and a fourth lens group having a negative refractive force, and is a method for manufacturing the second lens group and the third lens group at the time of focusing. And move along the optical axis, the distance between adjacent lens groups changes, and each lens is arranged in the lens barrel so as to satisfy the following conditional expression. 0.20 ⁇ DG4 / TL ⁇ 0.40 However, DG4: the length on the optical axis of the fourth lens group TL: the total length of the optical system in the infinity in-focus state.
  • the second method for manufacturing an optical system according to the present invention includes a first lens group having a positive refractive force and a second lens group having a negative refractive force arranged in order from the object side along the optical axis. It is a method of manufacturing an optical system having a third lens group having a positive refractive force and a fourth lens group having a negative refractive force, and is a method for manufacturing the second lens group and the third lens group at the time of focusing. And move along the optical axis, the distance between adjacent lens groups changes, and each lens is arranged in the lens barrel so as to satisfy the following conditional expression.
  • LnR1 radius of curvature of the lens surface on the object side in the negative lens arranged on the most image side of the optical system
  • LnR2 radius of curvature of the lens surface on the image side in the negative lens arranged on the most image side of the optical system.
  • the third method for manufacturing an optical system according to the present invention includes a first lens group having a positive refractive force and a second lens group having a negative refractive force arranged in order from the object side along the optical axis. It is a method of manufacturing an optical system having a third lens group having a positive refractive force and a fourth lens group having a negative refractive force, and is a method for manufacturing the second lens group and the third lens group at the time of focusing. And move along the optical axis, the distance between adjacent lens groups changes, and each lens is arranged in the lens barrel so as to satisfy the following conditional expression. 0.75 ⁇ f1 / (-f2) ⁇ 1.30 However, f1: the focal length of the first lens group f2: the focal length of the second lens group.
  • the fourth method for manufacturing an optical system according to the present invention includes a first lens group having a positive refractive force and a second lens group having a negative refractive force arranged in order from the object side along the optical axis. It is a method of manufacturing an optical system having a third lens group having a positive refractive force and a fourth lens group having a negative refractive force, and is a method for manufacturing the second lens group and the third lens group at the time of focusing.
  • Each lens is placed in the lens barrel so that the lens moves along the optical axis, the distance between adjacent lens groups changes, and the first lens group has a negative lens that satisfies the following conditional expression. do.
  • ndM1 the refractive index of the negative lens of the first lens group with respect to the d line
  • ⁇ dM1 the abbe number of the negative lens of the first lens group
  • ⁇ gFM1 the partial dispersion ratio of the negative lens of the first lens group.
  • the refractive index of the negative lens of the first lens group with respect to the g line is ngM1
  • the refractive index of the negative lens of the first lens group with respect to the F line is nFM1
  • C of the negative lens of the first lens group is the refractive index for a line.
  • ⁇ gFM1 (ngM1-nFM1) / (nFM1-nCM1) defined by the following equation.
  • 6 (A) and 6 (B) are aberration diagrams of the optical system according to the third embodiment in the infinity-focused state and the closest-distance-focused state, respectively. It is a figure which shows the lens structure of the optical system which concerns on 4th Embodiment. 8 (A) and 8 (B) are aberration diagrams of the optical system according to the fourth embodiment in the infinity-focused state and the closest-distance-focused state, respectively. It is a figure which shows the lens structure of the optical system which concerns on 5th Embodiment. 10 (A) and 10 (B) are aberration diagrams of the optical system according to the fifth embodiment in the infinity-focused state and the closest-distance-focused state, respectively.
  • the camera 1 includes a main body 2 and a photographing lens 3 mounted on the main body 2.
  • the main body 2 includes an image sensor 4, a main body control unit (not shown) that controls the operation of a digital camera, and a liquid crystal screen 5.
  • the photographing lens 3 includes an optical system OL composed of a plurality of lens groups and a lens position control mechanism (not shown) for controlling the position of each lens group.
  • the lens position control mechanism includes a sensor that detects the position of the lens group, a motor that moves the lens group back and forth along the optical axis, a control circuit that drives the motor, and the like.
  • the light from the subject is collected by the optical system OL of the photographing lens 3 and reaches the image plane I of the image pickup element 4.
  • the light from the subject that has reached the image plane I is photoelectrically converted by the image pickup device 4 and recorded as digital image data in a memory (not shown).
  • the digital image data recorded in the memory can be displayed on the liquid crystal screen 5 according to the operation of the user.
  • This camera may be a mirrorless camera or a single-lens reflex type camera having a quick return mirror.
  • the optical system OL shown in FIG. 11 schematically shows the optical system provided in the photographing lens 3, and the lens configuration of the optical system OL is not limited to this configuration.
  • the optical system OL (1) as an example of the optical system OL according to the first embodiment is a first lens group having a positive refractive power arranged in order from the object side along the optical axis. It is composed of G1, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a negative refractive power. At the time of focusing, the second lens group G2 and the third lens group G3 move along the optical axis, and the distance between adjacent lens groups changes.
  • the optical system OL according to the first embodiment satisfies the following conditional expression (1). 0.20 ⁇ DG4 / TL ⁇ 0.40 ... (1)
  • DG4 the length on the optical axis of the 4th lens group
  • G4 TL the total length of the optical system OL in the infinity in-focus state.
  • the optical system OL according to the first embodiment may be the optical system OL (2) shown in FIG. 3, the optical system OL (3) shown in FIG. 5, or the optical system OL (4) shown in FIG. 7.
  • the optical system OL (5) shown in FIG. 9 may be used.
  • the conditional expression (1) defines an appropriate relationship between the length on the optical axis of the fourth lens group G4 and the total length of the optical system OL.
  • the length on the optical axis of the fourth lens group G4 with respect to the total length of the optical system OL becomes large, so that the field curvature and coma aberration in the peripheral portion over the entire range of the magnification range. Can be satisfactorily corrected.
  • the total length of the optical system OL is the distance on the optical axis from the lens surface on the most object side of the optical system OL to the image plane I (note that the image is from the lens surface on the most image side of the optical system OL).
  • the distance to the surface I is the air equivalent distance).
  • conditional expression (1) If the corresponding value of the conditional expression (1) is out of the above range, it becomes difficult to correct the curvature of field and coma in the peripheral portion in a part of the magnification range.
  • the effect of the present embodiment can be further ensured.
  • the upper limit value of the conditional expression (1) By setting the upper limit value of the conditional expression (1) to 0.38, 0.36, 0.35, and further 0.33, the effect of the present embodiment can be further ensured.
  • the optical system OL (1) as an example of the optical system OL according to the second embodiment is a first lens group having a positive refractive power arranged in order from the object side along the optical axis. It is composed of G1, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a negative refractive power.
  • the second lens group G2 and the third lens group G3 move along the optical axis, and the distance between adjacent lens groups changes.
  • the optical system OL satisfies the following conditional expression (2). 3.00 ⁇ (LnR2 + LnR1) / (LnR2-LnR1) ⁇ 5.00 ... (2)
  • LnR1 radius of curvature of the lens surface on the object side in the negative lens arranged on the most image side of the optical system OL
  • LnR2 radius of curvature of the lens surface on the image side in the negative lens arranged on the most image side of the optical system OL.
  • the optical system OL according to the second embodiment may be the optical system OL (2) shown in FIG. 3, the optical system OL (3) shown in FIG. 5, or the optical system OL (4) shown in FIG. 7.
  • the optical system OL (5) shown in FIG. 9 may be used.
  • Conditional expression (2) defines an appropriate range for the shape factor of the negative lens arranged on the image side of the optical system OL. By satisfying the conditional expression (2), curvature of field and coma can be uniformly corrected in the image plane over the entire range of the magnification.
  • conditional expression (2) If the corresponding value of the conditional expression (2) is out of the above range, it becomes difficult to uniformly correct the curvature of field and coma in the image plane in a part of the magnification range.
  • the lower limit of the conditional expression (2) By setting the lower limit of the conditional expression (2) to 3.05, 3.10, 3.15, 3.20, and further 3.23, the effect of the present embodiment can be further ensured. can.
  • the upper limit value of the conditional expression (2) to 4.90, 4.80, 4.70, 4.60, 4.50, and further 4.40, the effect of this embodiment is more reliable. Can be.
  • the optical system OL (1) as an example of the optical system OL according to the third embodiment is a first lens group having a positive refractive power arranged in order from the object side along the optical axis. It is composed of G1, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a negative refractive power.
  • the second lens group G2 and the third lens group G3 move along the optical axis, and the distance between adjacent lens groups changes.
  • the optical system OL according to the third embodiment satisfies the following conditional expression (3). 0.75 ⁇ f1 / (-f2) ⁇ 1.30 ... (3)
  • f1 focal length of the first lens group G1
  • f2 focal length of the second lens group G2
  • the optical system OL according to the third embodiment may be the optical system OL (2) shown in FIG. 3, the optical system OL (3) shown in FIG. 5, or the optical system OL (4) shown in FIG. 7.
  • the optical system OL (5) shown in FIG. 9 may be used.
  • Conditional expression (3) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the second lens group G2. By satisfying the conditional equation (3), it is possible to suppress fluctuations in spherical aberration and curvature of field when focusing from an infinity object to a short-distance object.
  • conditional expression (3) If the corresponding value of the conditional expression (3) is out of the above range, it becomes difficult to suppress fluctuations in spherical aberration and curvature of field during focusing.
  • the lower limit of the conditional expression (3) By setting the lower limit of the conditional expression (3) to 0.80, 0.90, 0.95, 1.00, 1.05, and further 1.10, the effect of this embodiment is more reliable. Can be. Further, by setting the upper limit value of the conditional expression (3) to 1.28, 1.25, 1.23, and further 1.20, the effect of the present embodiment can be further ensured.
  • the optical system OL (1) as an example of the optical system OL according to the fourth embodiment is a first lens group having a positive refractive power arranged in order from the object side along the optical axis. It is composed of G1, a second lens group G2 having a negative refractive power, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a negative refractive power. At the time of focusing, the second lens group G2 and the third lens group G3 move along the optical axis, and the distance between adjacent lens groups changes.
  • the optical system OL satisfies the following conditional expressions (4) to (6). 1.80 ⁇ ndM1 ... (4) ⁇ dM1 ⁇ 26.00 ⁇ ⁇ ⁇ (5) ⁇ gFM1- (0.6415-0.00162 ⁇ ⁇ dM1) ⁇ 0.0120 ... (6)
  • ndM1 the refractive index of the negative lens of the first lens group G1 with respect to the d line
  • ⁇ dM1 the number of negative lenses of the first lens group G1
  • ⁇ gFM1 the partial dispersion ratio of the negative lens of the first lens group G1.
  • the refractive index of the negative lens of the lens group G1 with respect to the g line is ngM1
  • the refractive index of the negative lens of the first lens group G1 with respect to the F line is nFM1
  • the refractive index of the negative lens of the first lens group G1 with respect to the C line is nCM1.
  • the optical system OL according to the fourth embodiment may be the optical system OL (2) shown in FIG. 3, the optical system OL (3) shown in FIG. 5, or the optical system OL (4) shown in FIG. 7.
  • the optical system OL (5) shown in FIG. 9 may be used.
  • Conditional expression (4) defines an appropriate range for the refractive index of the negative lens of the first lens group G1 with respect to the d-line.
  • the conditional expression (5) defines an appropriate range for the Abbe number of the negative lens of the first lens group G1.
  • the conditional equation (6) defines an appropriate relationship between the partial dispersion ratio of the negative lens of the first lens group G1 and the Abbe number.
  • conditional expression (4) If the corresponding value of the conditional expression (4) is out of the above range, it becomes difficult to correct the axial chromatic aberration and the chromatic aberration of magnification in a part of the magnification range.
  • the lower limit of the conditional expression (4) By setting the lower limit of the conditional expression (4) to 1.82, 1.83, and further 1.84, the effect of the present embodiment can be further ensured.
  • conditional expression (5) If the corresponding value of the conditional expression (5) is out of the above range, it becomes difficult to correct the axial chromatic aberration and the chromatic aberration of magnification in a part of the magnification range.
  • the upper limit of the conditional expression (5) By setting the upper limit of the conditional expression (5) to 25.90, 25.85, 25.70, 25.50, and further 25.35, the effect of the present embodiment can be further ensured. can.
  • conditional expression (6) If the corresponding value of the conditional expression (6) is out of the above range, it becomes difficult to correct the axial chromatic aberration and the chromatic aberration of magnification in a part of the magnification range.
  • the upper limit of the conditional expression (6) By setting the upper limit of the conditional expression (6) to 0.0115, 0.0110, 0.0105, 0.0100, and further 0.0098, the effect of the present embodiment can be further ensured. can.
  • the lower limit of the conditional expression (6) may be larger than 0.0000.
  • the optical system OL according to the second to fourth embodiments satisfies the above-mentioned conditional expression (1).
  • the conditional expression (1) it is possible to satisfactorily correct the curvature of field and coma in the peripheral portion in the entire range of the magnification as in the first embodiment.
  • the lower limit of the conditional expression (1) By setting the lower limit of the conditional expression (1) to 0.21, 0.23, and further 0.25, the effect of each embodiment can be further ensured.
  • the upper limit value of the conditional expression (1) to 0.38, 0.36, 0.35, and further 0.33, the effect of each embodiment can be further ensured.
  • the optical system OL according to the third embodiment and the fourth embodiment satisfies the above-mentioned conditional expression (2).
  • conditional expression (2) curvature of field and coma can be uniformly corrected in the image plane over the entire range of the magnification as in the second embodiment.
  • the lower limit of the conditional expression (2) is 3.05, 3.10, 3.15, 3.20, and further 3.23, the effect of each embodiment can be further ensured.
  • the upper limit value of the conditional expression (2) to 4.90, 4.80, 4.70, 4.60, 4.50, and further 4.40, the effect of each embodiment is more reliable. Can be.
  • the optical system OL according to the fourth embodiment satisfies the above-mentioned conditional expression (3).
  • the conditional equation (3) it is possible to suppress fluctuations in spherical aberration and curvature of field when focusing from an infinity object to a short-distance object, as in the third embodiment.
  • the lower limit of the conditional expression (3) 0.80, 0.90, 0.95, 1.00, 1.05, and further 1.10, the effect of this embodiment is more reliable.
  • the upper limit value of the conditional expression (3) to 1.28, 1.25, 1.23, and further 1.20, the effect of the present embodiment can be further ensured.
  • the optical system OL according to the first to fourth embodiments satisfies the following conditional expression (7). 0.75 ⁇ f1 / f3 ⁇ 1.20 ... (7)
  • f1 focal length of the first lens group G1
  • f3 focal length of the third lens group G3
  • Conditional expression (7) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the third lens group G3.
  • conditional expression (7) If the corresponding value of the conditional expression (7) is out of the above range, it becomes difficult to suppress fluctuations in spherical aberration and curvature of field during focusing.
  • the lower limit of the conditional expression (7) By setting the lower limit of the conditional expression (7) to 0.80, 0.85, 0.90, 0.95, and further 1.00, the effect of each embodiment can be further ensured. can. Further, by setting the upper limit value of the conditional expression (7) to 1.18, 1.15, 1.13, and further 1.10, the effect of each embodiment can be further ensured.
  • the optical system OL according to the first to fourth embodiments satisfies the following conditional expression (8). 0.45 ⁇ (- ⁇ ) ⁇ ⁇ ⁇ (8)
  • ⁇ horizontal magnification of the optical system OL
  • Conditional expression (8) defines an appropriate range for the lateral magnification of the entire optical system OL. By satisfying the conditional expression (8), it is possible to take a picture at a close distance, which is preferable. By setting the lower limit of the conditional expression (8) to 0.52, 0.55, 0.60, 0.70, 0.75, and further 0.80, the effect of each embodiment is more reliable. Can be.
  • the optical system OL according to the first to fourth embodiments satisfies the following conditional expression (9). 35.0 ⁇ 2 / ⁇ 3 ⁇ 350.0 ... (9)
  • ⁇ 2 lateral magnification of the second lens group G2 in the infinity-focused state
  • ⁇ 3 lateral magnification of the third lens group G3 in the infinity-focused state.
  • Conditional expression (9) defines an appropriate relationship between the lateral magnification of the second lens group G2 in the infinity-focused state and the lateral magnification of the third lens group G3 in the infinity-focused state. .. By satisfying the conditional equation (9), it is possible to suppress the curvature of field and the fluctuation of spherical aberration during focusing.
  • conditional expression (9) If the corresponding value of the conditional expression (9) is out of the above range, it becomes difficult to suppress the curvature of field and the fluctuation of spherical aberration during focusing.
  • the lower limit of the conditional expression (9) By setting the lower limit of the conditional expression (9) to 35.50, 36.00, 36.50, 37.00, and further 37.30, the effect of each embodiment can be further ensured. can.
  • the upper limit of the conditional expression (9) By setting the upper limit of the conditional expression (9) to 300.00, 250.00, 200.00, 150.00, 100.00, 85.00, and further 75.00, the embodiment of each embodiment can be set. The effect can be made more certain.
  • the optical system OL according to the first to fourth embodiments may satisfy the following conditional expression (10). 0.005 ⁇ 3 / ⁇ 2 ⁇ 0.035 ... (10) However, ⁇ 2: lateral magnification of the second lens group G2 in the infinity-focused state ⁇ 3: lateral magnification of the third lens group G3 in the infinity-focused state.
  • conditional expression (10) defines an appropriate relationship between the lateral magnification of the second lens group G2 and the lateral magnification of the third lens group G3 in the infinity focusing state.
  • conditional expression (10) If the corresponding value of the conditional expression (10) is out of the above range, it becomes difficult to suppress the curvature of field and the fluctuation of spherical aberration at the time of focusing.
  • the effect of each embodiment can be further ensured.
  • the upper limit value of the conditional expression (10) By setting the upper limit value of the conditional expression (10) to 0.033, 0.030, and further 0.029, the effect of each embodiment can be further ensured.
  • the optical system OL satisfies the following conditional expression (11). ⁇ 2 + (1 / ⁇ 2) ⁇ -2 ⁇ 0.10 ⁇ ⁇ ⁇ (11) However, ⁇ 2: lateral magnification of the second lens group G2 in the infinity in-focus state.
  • Conditional expression (11) defines an appropriate range for the lateral magnification of the second lens group G2 in the infinity in-focus state.
  • various aberrations such as spherical aberration and curvature of field in the infinity in-focus state can be satisfactorily corrected.
  • conditional expression (11) If the corresponding value of the conditional expression (11) is out of the above range, it becomes difficult to correct various aberrations such as spherical aberration and curvature of field in the infinity in-focus state.
  • the upper limit values of the conditional expression (11) By setting the upper limit values of the conditional expression (11) to 0.08, 0.06, and further 0.05, the effect of each embodiment can be further ensured.
  • the optical system OL according to the first to fourth embodiments satisfies the following conditional expression (12). ⁇ 3 + (1 / ⁇ 3) ⁇ -2 ⁇ 0.10 ⁇ ⁇ ⁇ (12) However, ⁇ 3: lateral magnification of the third lens group G3 in the infinity in-focus state.
  • Conditional expression (12) defines an appropriate range for the lateral magnification of the third lens group G3 in the infinity in-focus state.
  • various aberrations such as spherical aberration and curvature of field in the infinity in-focus state can be satisfactorily corrected.
  • conditional expression (12) If the corresponding value of the conditional expression (12) is out of the above range, it becomes difficult to correct various aberrations such as spherical aberration and curvature of field in the infinity in-focus state.
  • the upper limit values of the conditional expression (12) By setting the upper limit values of the conditional expression (12) to 0.08, 0.06, and further 0.05, the effect of each embodiment can be further ensured.
  • the optical system OL according to the first to fourth embodiments satisfies the following conditional expression (13). 0.05 ⁇ Bf / TL ⁇ 0.35 ... (13)
  • Bf the back focus of the optical system OL in the infinity-focused state
  • TL the total length of the optical system OL in the infinity-focused state.
  • Conditional expression (13) defines an appropriate relationship between the back focus of the optical system OL and the total length of the optical system OL.
  • the back focus of the optical system OL is the distance on the optical axis (air conversion distance) from the lens surface on the image side of the optical system OL to the image plane I.
  • the optical system OL according to the first to fourth embodiments satisfies the following conditional expression (14). 0.10 ⁇ Bf / f ⁇ 0.50 ... (14) However, Bf: the back focus of the optical system OL in the infinite focus state f: the focal length of the optical system OL
  • the conditional expression (14) defines an appropriate relationship between the back focus of the optical system OL and the focal length of the optical system OL. By satisfying the conditional equation (14), it is possible to obtain an optical system having a short back focus while satisfactorily suppressing the occurrence of various aberrations. By setting the lower limit of the conditional expression (14) to 0.12, 0.14, and further 0.15, the effect of each embodiment can be further ensured. Further, by setting the upper limit value of the conditional expression (20) to 0.45, 0.40, 0.35, 0.30, 0.25, and further 0.20, the effect of each embodiment is more reliable. Can be.
  • the optical system OL has a diaphragm (aperture diaphragm) S and satisfies the following conditional expression (15). 0.50 ⁇ L1S / SLn ⁇ 1.00 ... (15)
  • L1S the distance on the optical axis from the lens surface on the most object side of the optical system OL in the infinite focus state to the aperture S
  • SLn the most image side of the optical system OL from the aperture S in the infinity focus state.
  • the distance on the optical axis from the lens surface on the most object side of the optical system OL to the aperture S and the distance on the optical axis from the aperture S to the lens surface on the most image side of the optical system OL It defines the appropriate relationship between.
  • the optical system OL satisfies the following conditional expression (16). 0.70 ⁇ Mf2 / Mf3 ⁇ 1.10 ... (16)
  • Mf2 the absolute value of the amount of movement of the second lens group G2 when focusing from the infinity object to the closest object
  • Mf3 the third lens when focusing from the infinity object to the closest object. Absolute value of movement amount of group G3
  • Conditional expression (16) defines an appropriate relationship between the amount of movement of the second lens group G2 and the amount of movement of the third lens group G3 during focusing.
  • the closest distance corresponds to the shortest shooting distance.
  • conditional expression (16) If the corresponding value of the conditional expression (16) is out of the above range, it becomes difficult to suppress fluctuations in spherical aberration and curvature of field during focusing.
  • the lower limit of the conditional expression (16) By setting the lower limit of the conditional expression (16) to 0.73, 0.75, 0.78, 0.80, and further 0.82, the effect of each embodiment can be further ensured. can. Further, by setting the upper limit values of the conditional expression (16) to 0.99, 0.98, and further 0.97, the effect of each embodiment can be further ensured.
  • the third lens group G3 has a negative lens satisfying the following conditional expressions (17) to (19). 1.80 ⁇ ndM3 ... (17) ⁇ dM3 ⁇ 26.00 ⁇ ⁇ ⁇ (18) ⁇ gFM3- (0.6415-0.00162 ⁇ ⁇ dM3) ⁇ 0.0120 ... (19)
  • ndM3 the refractive index of the negative lens of the third lens group G3 with respect to the d line
  • ⁇ dM3 the abbe number of the negative lens of the third lens group G3
  • ⁇ gFM3 the partial dispersion ratio of the negative lens of the third lens group G3.
  • the refractive index of the negative lens of the lens group G3 with respect to the g line is ngM3
  • the refractive index of the negative lens of the third lens group G3 with respect to the F line is nFM3
  • the refractive index of the negative lens of the third lens group G3 with respect to the C line is nCM3.
  • ⁇ gFM3 (ngM3-nFM3) / (nFM3-nCM3) defined by the following equation.
  • Conditional expression (17) defines an appropriate range for the refractive index of the negative lens of the third lens group G3 with respect to the d-line.
  • the conditional expression (18) defines an appropriate range for the Abbe number of the negative lens of the third lens group G3.
  • the conditional expression (19) defines an appropriate relationship between the partial dispersion ratio of the negative lens of the third lens group G3 and the Abbe number.
  • conditional expression (17) If the corresponding value of the conditional expression (17) is out of the above range, it becomes difficult to suppress the fluctuation of the axial chromatic aberration at the time of focusing.
  • the lower limit of the conditional expression (17) By setting the lower limit of the conditional expression (17) to 1.82, 1.83, and further 1.84, the effect of each embodiment can be further ensured.
  • conditional expression (18) If the corresponding value of the conditional expression (18) is out of the above range, it becomes difficult to suppress the fluctuation of the axial chromatic aberration at the time of focusing.
  • the upper limit of the conditional expression (18) By setting the upper limit of the conditional expression (18) to 25.90, 25.85, 25.70, 25.50, and further 25.35, the effect of each embodiment can be further ensured. can.
  • conditional expression (19) If the corresponding value of the conditional expression (19) is out of the above range, it becomes difficult to suppress the fluctuation of the axial chromatic aberration at the time of focusing.
  • the upper limit of the conditional expression (19) By setting the upper limit of the conditional expression (19) to 0.0115, 0.0110, 0.0105, 0.0100, and further 0.0098, the effect of each embodiment can be further ensured. can. Further, the lower limit of the conditional expression (19) may be larger than 0.0000.
  • the optical system OL satisfies the following conditional expression (20).
  • L1R1 radius of curvature of the lens surface on the object side of the positive lens arranged on the most object side of the optical system OL
  • L1R2 radius of curvature of the lens surface on the image side of the positive lens arranged on the most object side of the optical system OL.
  • Conditional expression (20) defines an appropriate range for the shape factor of the positive lens arranged on the most object side of the optical system OL. By satisfying the conditional expression (20), the spherical aberration in the infinity in-focus state can be satisfactorily corrected.
  • the upper limit of the conditional expression (20) is set to 0.00, -0.01, -0.03, -0.08, -0.10, -0.30, -0.50, and further -0.60. By setting, the effect of each embodiment can be made more certain. Further, the lower limit of the conditional expression (20) may be set to -2.00, -1.80, -1.50, -1.45, and further -1.40.
  • the lens arranged on the image side of the fourth lens group G4 has a negative refractive power. This makes it possible to satisfactorily correct curvature of field and coma in the peripheral portion over the entire range of the magnification.
  • the optical system OL according to the first to fourth embodiments when focusing from an infinite object to a short-range object, the second lens group G2 moves toward the image side along the optical axis, and the third lens group G3 Is desirable to move toward the object along the optical axis.
  • it is desirable that the position of the fourth lens group G4 is fixed with respect to the image plane I at the time of focusing. This makes it possible to suppress aberration fluctuations during focusing.
  • At least one lens surface of the negative lens arranged on the image side of the optical system OL is an aspherical surface. Thereby, the curvature of field can be uniformly corrected in the image plane.
  • the manufacturing method of the optical system OL will be outlined.
  • a fourth lens group G4 having a negative refractive power is arranged (step ST1).
  • the second lens group G2 and the third lens group G3 move along the optical axis, and the distance between the adjacent lens groups changes (step ST2).
  • each lens is arranged in the lens barrel so as to satisfy at least the above conditional expression (1) (step ST3). According to such a manufacturing method, it becomes possible to manufacture an optical system having less aberration fluctuation during focusing.
  • the manufacturing method of the optical system OL according to the second embodiment will be outlined. Since the manufacturing method of the optical system OL according to the second embodiment is the same as the manufacturing method described in the first embodiment, it will be described with reference to FIG. 12, which is the same as the first embodiment.
  • a fourth lens group G4 having a negative refractive power is arranged (step ST1).
  • each lens is arranged in the lens barrel so as to satisfy at least the above conditional expression (2) (step ST3). According to such a manufacturing method, it becomes possible to manufacture an optical system having less aberration fluctuation during focusing.
  • the manufacturing method of the optical system OL according to the third embodiment will be outlined. Since the manufacturing method of the optical system OL according to the third embodiment is the same as the manufacturing method described in the first embodiment, it will be described with reference to FIG. 12, which is the same as the first embodiment.
  • a fourth lens group G4 having a negative refractive power is arranged (step ST1).
  • each lens is arranged in the lens barrel so as to satisfy at least the above conditional expression (3) (step ST3). According to such a manufacturing method, it becomes possible to manufacture an optical system having less aberration fluctuation during focusing.
  • the manufacturing method of the optical system OL according to the fourth embodiment will be outlined.
  • a fourth lens group G4 having a negative refractive power is arranged (step ST11).
  • the second lens group G2 and the third lens group G3 move along the optical axis, and the distance between the adjacent lens groups changes (step ST12).
  • each lens is arranged in the lens barrel so that at least the first lens group G1 has a negative lens satisfying the above conditional expressions (4) to (6) (step ST13). According to such a manufacturing method, it becomes possible to manufacture an optical system having less aberration fluctuation during focusing.
  • FIG. 1, FIG. 3, FIG. 5, FIG. 7, and FIG. 9 are cross-sectional views showing the configuration and refractive power distribution of the optical systems OL ⁇ OL (1) to OL (5) ⁇ according to the first to fifth embodiments. be.
  • the cross-sectional views of the optical systems OL (1) to OL (5) according to the first to fifth embodiments they are along the optical axis of each lens group when focusing from infinity to a short-distance object (finite-distance object). The direction of movement is indicated by an arrow with the word "focus".
  • each lens group is represented by a combination of reference numerals G and numbers, and each lens is represented by a combination of reference numerals L and numbers.
  • the lens group and the like are represented by independently using combinations of the reference numerals and numbers for each embodiment. Therefore, even if the same combination of reference numerals and numbers is used between the examples, it does not mean that they have the same configuration.
  • f is the focal length of the entire optical system
  • 2 ⁇ is the angle of view (unit is ° (degrees)
  • ⁇ is the half angle of view
  • Ymax is the maximum image height
  • TL indicates the distance from the frontmost surface of the lens on the optical axis in the infinity-focused state to the final surface of the lens plus Bf
  • Bf is the final surface of the lens on the optical axis in the infinity-focused state.
  • the air conversion distance (back focus) from to the image plane is shown.
  • ⁇ 2 indicates the lateral magnification of the second lens group in the infinity in-focus state.
  • ⁇ 3 indicates the lateral magnification of the third lens group in the infinity in-focus state.
  • Mf2 indicates the absolute value of the movement amount of the second lens group at the time of focusing from the infinity object to the closest object.
  • Mf3 indicates the absolute value of the movement amount of the third lens group at the time of focusing from the infinity object to the closest object.
  • the plane numbers indicate the order of the optical planes from the object side along the traveling direction of the light beam
  • R is the radius of curvature of each optical plane (the plane whose center of curvature is located on the image side).
  • D is the distance on the optical axis from each optical surface to the next optical surface (or image surface)
  • nd is the refractive index of the material of the optical member with respect to the d line
  • ⁇ d is optical.
  • the Abbe number and ⁇ gF with respect to the d-line of the material of the member indicate the partial dispersion ratio of the material of the optical member.
  • ⁇ of the radius of curvature indicates a plane or an aperture, and (aperture S) indicates an aperture stop S.
  • the description of the refractive index nd of air 1.00000 is omitted.
  • the optical surface is an aspherical surface, the surface number is marked with *, and the radius of curvature R indicates the near-axis radius of curvature.
  • the refractive index of the material of the optical member is C.
  • the partial dispersion ratio ⁇ gF of the material of the optical member is defined by the following equation (A).
  • Equation (B) the shape of the aspherical surface shown in [Lens specifications] is shown by the following equation (B).
  • X (y) is the distance (sag amount) along the optical axis direction from the tangent plane at the apex of the aspherical surface to the position on the aspherical surface at the height y
  • R is the radius of curvature (near axis radius of curvature) of the reference spherical surface.
  • Kappa is the conical constant
  • Ai is the i-th order aspherical coefficient.
  • E-n indicates " x10 -n ".
  • 1.234E-05 1.234 ⁇ 10 -5 .
  • the second-order aspherical coefficient A2 is 0, and the description thereof is omitted.
  • the table of [Variable spacing data] shows the surface spacing at the surface number i in which the surface spacing is (Di) in the table of [Lens specifications]. Note that D0 indicates the distance from the object to the optical surface on the most object side in the optical system.
  • f indicates the focal length of the entire optical system
  • ⁇ indicates the photographing magnification (horizontal magnification) of the optical system
  • FNO indicates the F number of the optical system.
  • the table of [lens group data] shows the starting surface (the surface closest to the object) and the focal length of each lens group.
  • mm is generally used for the focal length f, the radius of curvature R, the plane spacing D, other lengths, etc., unless otherwise specified, but the optical system is expanded proportionally.
  • the optical performance is not limited to this because the same optical performance can be obtained even if the proportional reduction is performed.
  • FIG. 1 is a diagram showing a lens configuration of an optical system according to the first embodiment.
  • the optical system OL (1) according to the first embodiment has a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power arranged in order from the object side along the optical axis.
  • the second lens group G2 moves to the image side along the optical axis
  • the third lens group G3 moves to the object side along the optical axis and is adjacent to each other.
  • the distance between each lens group changes.
  • the positions of the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane I.
  • the aperture stop S is arranged between the second lens group G2 and the third lens group G3.
  • the position of the aperture stop S is fixed with respect to the image plane I.
  • the symbol (+) or ( ⁇ ) attached to each lens group symbol indicates the refractive power of each lens group, and this also applies to all the following examples.
  • the first lens group G1 includes a biconvex positive lens L11 arranged in order from the object side along the optical axis, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L12 having a convex surface facing the object side. It is composed of a bonded lens to which L13 is bonded and a positive meniscus lens L14 having a convex surface facing the object side.
  • the negative meniscus lens L12 of the first lens group G1 corresponds to a negative lens satisfying the conditional expressions (4) to (6).
  • the second lens group G2 includes a biconcave negative lens L21 arranged in order from the object side along the optical axis, a negative meniscus lens L22 having a convex surface facing the object side, and a positive meniscus lens L22 having a convex surface facing the object side. It is composed of a bonded lens to which L23 is bonded and a bonded lens.
  • a biconvex positive lens L31 arranged in order from the object side along the optical axis, a negative meniscus lens L32 having a convex surface facing the object side, and a biconvex positive lens L33 are joined. It is composed of a bonded lens and a lens.
  • the negative meniscus lens L32 of the third lens group G3 corresponds to a negative lens satisfying the conditional expressions (17) to (19).
  • the fourth lens group G4 has a negative meniscus lens L41 having a convex surface facing the object side, a negative meniscus lens L42 having a convex surface facing the object side, and a convex surface facing the object side, arranged in order from the object side along the optical axis.
  • a bonded lens to which a positive meniscus lens L43 is bonded, a bonded lens to which a negative meniscus lens L44 having a convex surface facing the object side and a positive meniscus lens L45 having a convex surface facing the object side are bonded, and a concave surface to the object side. It is composed of a negative meniscus lens L46, which is directed toward the lens.
  • the negative meniscus lens L46 has an aspherical lens surface on the object side.
  • the image plane I is arranged on the image side of the fourth lens group G4.
  • Table 1 below lists the values of the specifications of the optical system according to the first embodiment.
  • FIG. 2A is a diagram of various aberrations in the infinity-focused state of the optical system according to the first embodiment.
  • FNO indicates an F number
  • Y indicates an image height.
  • NA indicates the numerical aperture
  • Y indicates the image height.
  • the spherical aberration diagram shows the value of the F number or numerical aperture corresponding to the maximum aperture
  • the astigmatism diagram and the distortion diagram show the maximum image height
  • the coma aberration diagram shows the value of each image height. ..
  • 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 present embodiment are used, and duplicate description is omitted.
  • the optical system according to the first embodiment has excellent imaging performance in which various aberrations are satisfactorily corrected in the entire range from the infinity focusing state to the closest distance focusing state. You can see that there is.
  • FIG. 3 is a diagram showing a lens configuration of an optical system according to a second embodiment.
  • the optical system OL (2) according to the second embodiment has a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power arranged in order from the object side along the optical axis.
  • the second lens group G2 moves to the image side along the optical axis
  • the third lens group G3 moves to the object side along the optical axis and is adjacent to each other.
  • the distance between each lens group changes.
  • the positions of the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane I.
  • the aperture stop S is arranged between the second lens group G2 and the third lens group G3. At the time of focusing, the position of the aperture stop S is fixed with respect to the image plane I.
  • the first lens group G1 includes a positive meniscus lens L11 having a concave surface facing the object side, a negative meniscus lens L12 having a convex surface facing the object side, and a convex surface facing the object side, arranged in order from the object side along the optical axis. It is composed of a bonded lens to which the positive meniscus lens L13 is bonded and a regular meniscus lens L14 having a convex surface facing the object side.
  • the negative meniscus lens L12 of the first lens group G1 corresponds to a negative lens satisfying the conditional expressions (4) to (6).
  • the negative meniscus lens L32 of the third lens group G3 corresponds to a negative lens satisfying the conditional expressions (17) to (19).
  • Table 2 below lists the values of the specifications of the optical system according to the second embodiment.
  • FIG. 4A is a diagram of various aberrations in the infinity-focused state of the optical system according to the second embodiment.
  • FIG. 5 is a diagram showing a lens configuration of an optical system according to a third embodiment.
  • the optical system OL (3) according to the third embodiment has a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power arranged in order from the object side along the optical axis.
  • the second lens group G2 moves to the image side along the optical axis
  • the third lens group G3 moves to the object side along the optical axis and is adjacent to each other.
  • the distance between each lens group changes.
  • the positions of the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane I.
  • the aperture stop S is arranged between the second lens group G2 and the third lens group G3. At the time of focusing, the position of the aperture stop S is fixed with respect to the image plane I.
  • the first lens group G1 includes a biconvex positive lens L11 arranged in order from the object side along the optical axis, a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L12 having a convex surface facing the object side. It is composed of a bonded lens to which L13 is bonded and a positive meniscus lens L14 having a convex surface facing the object side.
  • the positive meniscus lens L14 has an aspherical lens surface on the object side.
  • the negative meniscus lens L12 of the first lens group G1 corresponds to a negative lens satisfying the conditional expressions (4) to (6).
  • the negative meniscus lens L32 of the third lens group G3 corresponds to a negative lens satisfying the conditional expressions (17) to (19).
  • Table 3 below lists the values of the specifications of the optical system according to the third embodiment.
  • FIG. 6A is a diagram of various aberrations in the infinity-focused state of the optical system according to the third embodiment.
  • FIG. 7 is a diagram showing a lens configuration of an optical system according to a fourth embodiment.
  • the optical system OL (4) according to the fourth embodiment has a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power arranged in order from the object side along the optical axis.
  • the second lens group G2 moves to the image side along the optical axis
  • the third lens group G3 moves to the object side along the optical axis and is adjacent to each other.
  • the distance between each lens group changes.
  • the positions of the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane I.
  • the aperture stop S is arranged between the second lens group G2 and the third lens group G3. At the time of focusing, the position of the aperture stop S is fixed with respect to the image plane I.
  • the second lens group G2 and the third lens group G3 are configured in the same manner as in the first embodiment, the same reference numerals as in the case of the first embodiment are assigned to each of these lenses. A detailed description will be omitted.
  • a biconvex positive lens L11 arranged in order from the object side along the optical axis, a negative meniscus lens L12 with a convex surface facing the object side, and a biconvex positive lens L13 are joined. It is composed of a bonded lens and a positive meniscus lens L14 having a convex surface facing the object side.
  • the positive meniscus lens L14 has an aspherical lens surface on the object side.
  • the negative meniscus lens L12 of the first lens group G1 corresponds to a negative lens satisfying the conditional expressions (4) to (6).
  • the negative meniscus lens L32 of the third lens group G3 corresponds to a negative lens satisfying the conditional expressions (17) to (19).
  • the fourth lens group G4 includes a biconcave negative lens L41 arranged in order from the object side along the optical axis, a negative meniscus lens L42 having a convex surface facing the object side, and a positive meniscus lens L42 having a convex surface facing the object side.
  • the negative meniscus lens L46 has an aspherical lens surface on the object side.
  • the image plane I is arranged on the image side of the fourth lens group G4.
  • Table 4 lists the values of the specifications of the optical system according to the fourth embodiment.
  • FIG. 8A is a diagram of various aberrations in the infinity-focused state of the optical system according to the fourth embodiment.
  • FIG. 9 is a diagram showing a lens configuration of an optical system according to a fifth embodiment.
  • the optical system OL (5) according to the fifth embodiment has a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power arranged in order from the object side along the optical axis. , A third lens group G3 having a positive refractive power, and a fourth lens group G4 having a negative refractive power.
  • the second lens group G2 moves to the image side along the optical axis
  • the third lens group G3 moves to the object side along the optical axis and is adjacent to each other.
  • the distance between each lens group changes.
  • the positions of the first lens group G1 and the fourth lens group G4 are fixed with respect to the image plane I.
  • the aperture stop S is arranged between the second lens group G2 and the third lens group G3. At the time of focusing, the position of the aperture stop S is fixed with respect to the image plane I.
  • the second lens group G2 and the third lens group G3 are configured in the same manner as in the first embodiment, the same reference numerals as in the case of the first embodiment are assigned to each of these lenses. A detailed description will be omitted.
  • a biconvex positive lens L11 arranged in order from the object side along the optical axis, a negative meniscus lens L12 with a convex surface facing the object side, and a biconvex positive lens L13 are joined. It is composed of a bonded lens and a positive meniscus lens L14 having a convex surface facing the object side.
  • the negative meniscus lens L12 of the first lens group G1 corresponds to a negative lens satisfying the conditional expressions (4) to (6).
  • the negative meniscus lens L32 of the third lens group G3 corresponds to a negative lens satisfying the conditional expressions (17) to (19).
  • the fourth lens group G4 has a negative meniscus lens L41 having a convex surface facing the object side, a negative meniscus lens L42 having a convex surface facing the object side, and a convex surface facing the object side, arranged in order from the object side along the optical axis.
  • a bonded lens to which a positive meniscus lens L43 is bonded, a positive meniscus lens L44 having a convex surface facing the object side, a negative meniscus lens L45 having a convex surface facing the object side, and a biconvex positive lens L46 are bonded. It is composed of a bonded lens and a negative meniscus lens L47 with a concave surface facing the object side.
  • the negative meniscus lens L47 has an aspherical lens surface on the object side.
  • the image plane I is arranged on the image side of the fourth lens group G4.
  • Table 5 lists the values of the specifications of the optical system according to the fifth embodiment.
  • FIG. 10A is a diagram of various aberrations of the optical system according to the fifth embodiment in the infinity in-focus state.
  • Conditional expression (1) 0.20 ⁇ DG4 / TL ⁇ 0.40
  • Conditional expression (2) 3.00 ⁇ (LnR2 + LnR1) / (LnR2-LnR1) ⁇ 5.00
  • Conditional expression (3) 0.75 ⁇ f1 / (-f2) ⁇ 1.
  • Conditional expression (4) 1.80 ⁇ ndM1
  • Conditional expression (5) ⁇ dM1 ⁇ 26.00
  • Conditional expression (6) ⁇ gFM1- (0.6415-0.00162 ⁇ ⁇ dM1) ⁇ 0.0120
  • Conditional expression (7) 0.75 ⁇ f1 / f3 ⁇ 1.20
  • Conditional expression (8) 0.45 ⁇ (- ⁇ )
  • Conditional expression (9) 35.0 ⁇ 2 / ⁇ 3 ⁇ 350.0
  • Conditional expression (10) 0.005 ⁇ 3 / ⁇ 2 ⁇ 0.035
  • a four-group configuration is shown, but the present application is not limited to this, and an optical system having another group configuration (for example, five groups, etc.) can also be configured.
  • a lens or a lens group may be added to the most object side or the most image plane side of the optical system of the present embodiment.
  • the lens group refers to a portion having at least one lens separated by an air interval that changes at the time of focusing.
  • the lens group or partial lens group is moved so as to have a component in the direction perpendicular to the optical axis, or is rotationally moved (swinged) in the in-plane direction including the optical axis to correct image blur caused by camera shake. It may be used as an anti-vibration lens group.
  • the lens surface may be formed of a spherical surface or a flat surface, or may be formed of an aspherical surface.
  • lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to processing and assembly adjustment errors can be prevented, which is preferable. Further, even if the image plane is displaced, the deterioration of the depiction performance is small, which is preferable.
  • the aspherical surface is an aspherical surface formed by grinding, a glass mold aspherical surface formed by forming glass into an aspherical surface shape, or a composite aspherical surface formed by forming resin on the glass surface into an aspherical surface shape. It doesn't matter which one. Further, the lens surface may be a diffraction surface, and the lens may be a refractive index distribution type lens (GRIN lens) or a plastic lens.
  • GRIN lens refractive index distribution type lens
  • the aperture diaphragm is preferably arranged between the second lens group and the third lens group, but the role may be substituted by the frame of the lens without providing the member as the aperture diaphragm.
  • Each lens surface may be provided with an antireflection film having high transmittance in a wide wavelength range in order to reduce flare and ghost and achieve high contrast optical performance.
  • G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group I image plane S aperture stop

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PCT/JP2021/036577 2020-11-06 2021-10-04 光学系、光学機器、および光学系の製造方法 Ceased WO2022097401A1 (ja)

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