WO2022137820A1 - 変倍光学系、光学機器、および変倍光学系の製造方法 - Google Patents
変倍光学系、光学機器、および変倍光学系の製造方法 Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/143—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 ++-
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—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
- G02B15/144107—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
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B21/00—Microscopes
- G02B21/18—Arrangements with more than one light path, e.g. for comparing two specimens
- G02B21/20—Binocular arrangements
Definitions
- the present invention relates to a variable magnification optical system, an optical device, and a method for manufacturing the variable magnification optical system.
- variable magnification optical systems suitable for photographic cameras, electronic still cameras, video cameras, etc. have been proposed (see, for example, Patent Document 1).
- a variable magnification optical system it is difficult to obtain bright and good optical performance while making it compact.
- the first variable magnification optical system is composed of a first lens group having a positive refractive power and a rear group having a plurality of lens groups arranged in order from the object side along the optical axis.
- the distance between adjacent lens groups changes, and the plurality of lens groups in the rear group include a second lens group having a positive refractive power arranged on the most object side of the rear group.
- the following conditional expression is satisfied. 0.15 ⁇ f2 / f1 ⁇ 0.80
- f1 the focal length of the first lens group
- f2 the focal length of the second lens group.
- the second variable magnification optical system consists of a first lens group having a positive refractive force and a rear group having a plurality of lens groups arranged in order from the object side along the optical axis, and has a wide angle.
- the first lens group moves toward the object along the optical axis, the distance between adjacent lens groups changes, and the first lens group emits light.
- fP1 the focal length of the front fixed group
- fF1 the focal length of the front focusing group
- fw the focal length of the variable magnification optical system in the wide-angle end state.
- the optical device according to the present invention is configured to include the above-mentioned variable magnification optical system.
- the first method for manufacturing a variable magnification optical system according to the present invention is from a first lens group having a positive refractive power and a rear group having a plurality of lens groups arranged in order from the object side along the optical axis.
- This is a method for manufacturing a variable magnification optical system, in which the distance between adjacent lens groups changes during magnification change, and the plurality of lens groups in the rear group are arranged on the most object side of the rear group.
- Each lens is arranged in a lens barrel so as to include a second lens group having a positive refractive power and satisfy the following conditional expression. 0.15 ⁇ f2 / f1 ⁇ 0.80
- f1 the focal length of the first lens group
- f2 the focal length of the second lens group.
- the second method for manufacturing a variable magnification optical system according to the present invention is from a first lens group having a positive refractive force and a rear group having a plurality of lens groups arranged in order from the object side along the optical axis.
- This is a method for manufacturing a variable magnification optical system, in which the first lens group moves toward an object along the optical axis when the magnification is changed from the wide-angle end state to the telescopic end state, and the adjacent lens groups are connected to each other.
- the distance changes, and the first lens group is the front fixed group, which is arranged in order from the object side along the optical axis and whose position is fixed with respect to the image plane during focusing, and the light during focusing.
- each lens has a front focusing group that moves along the axis, and each lens is arranged in the lens barrel so as to satisfy the following conditional expression. 0.60 ⁇ fP1 / (-fF1) ⁇ 1.00 0.80 ⁇ (-fF1) / fw ⁇ 1.40
- fP1 the focal length of the front fixed group
- fF1 the focal length of the front focusing group
- fw the focal length of the variable magnification optical system in the wide-angle end state.
- 6 (A) and 6 (B) are aberration diagrams at infinity focusing in the wide-angle end state and the telephoto end state of the variable magnification optical system according to the third embodiment, respectively. It is a figure which shows the lens structure of the variable magnification optical system which concerns on 4th Embodiment. 8 (A) and 8 (B) are aberration diagrams at infinity focusing in the wide-angle end state and the telephoto end state of the variable magnification optical system according to the fourth embodiment, respectively. It is a figure which shows the structure of the camera provided with the variable magnification optical system which concerns on each embodiment. It is a flowchart which shows the manufacturing method of the variable magnification optical system which concerns on 1st Embodiment. It is a flowchart which shows the manufacturing method of the variable magnification optical system which concerns on 2nd Embodiment.
- 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 pickup element 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 a variable magnification optical system ZL 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.
- variable magnification optical system ZL of the photographing lens 3 The light from the subject is focused by the variable magnification optical system ZL 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 variable magnification optical system ZL shown in FIG. 9 schematically shows the variable magnification optical system provided in the photographing lens 3, and the lens configuration of the variable magnification optical system ZL is not limited to this configuration. do not have.
- variable magnification optical system ZL (1) as an example of the variable magnification optical system (zoom lens) ZL according to the first embodiment is positive, arranged in order from the object side along the optical axis. It is composed of a first lens group G1 having a refractive power and a rear group GR having a plurality of lens groups. At the time of scaling, the distance between adjacent lens groups changes.
- the plurality of lens groups of the rear group GR include a second lens group G2 having a positive refractive power arranged on the most object side of the rear group GR.
- variable magnification optical system ZL satisfies the following conditional expression (1). 0.15 ⁇ f2 / f1 ⁇ 0.80 ... (1)
- f1 focal length of the first lens group G1
- f2 focal length of the second lens group G2
- variable magnification optical system ZL may be the variable magnification optical system ZL (2) shown in FIG. 3, the variable magnification optical system ZL (3) shown in FIG. 5, and the variable magnification optical system shown in FIG. 7.
- the system ZL (4) may be used.
- the conditional expression (1) defines an appropriate relationship between the focal length of the first lens group G1 and the focal length of the second lens group G2.
- the focal length of the first lens group G1 is the focal length of the first lens group G1 at the time of focusing at infinity.
- conditional expression (1) If the corresponding value of the conditional expression (1) is out of the above range, it becomes difficult to obtain good optical performance in at least a part of the scaling range.
- This implementation is carried out by setting the upper limit of the conditional expression (1) to 0.75, 0.70, 0.65, 0.60, 0.55, 0.50, 0.45, and further 0.40.
- the effect of the morphology can be made more certain.
- the lower limit of the conditional expression (1) to 0.18, 0.20, 0.23, 0.25, 0.25, and 0.30, the effect of the present embodiment is more reliable. Can be.
- variable magnification optical system ZL (1) as an example of the variable magnification optical system (zoom lens) ZL according to the second embodiment is positively arranged in order from the object side along the optical axis. It is composed of a first lens group G1 having a refractive power and a rear group GR having a plurality of lens groups.
- first lens group G1 When scaling from the wide-angle end state to the telephoto end state, the first lens group G1 moves toward the object along the optical axis, and the distance between adjacent lens groups changes.
- the first lens group G1 is a front fixed group GP1 that is arranged in order from the object side along the optical axis and whose position is fixed with respect to the image plane I during focusing, and along the optical axis during focusing. It has an anterior focusing group GF1 that moves.
- variable magnification optical system ZL satisfies the following conditional expression (2) and conditional expression (3). 0.60 ⁇ fP1 / (-fF1) ⁇ 1.00 ... (2) 0.80 ⁇ (-fF1) / fw ⁇ 1.40 ... (3)
- fP1 focal length of the front fixed group
- GP1 fF1 focal length of the front focusing group
- GF1 fw focal length of the variable magnification optical system ZL in the wide-angle end state.
- variable magnification optical system ZL may be the variable magnification optical system ZL (2) shown in FIG. 3, the variable magnification optical system ZL (3) shown in FIG. 5, and the variable magnification optical system shown in FIG. 7.
- the system ZL (4) may be used.
- Conditional expression (2) defines an appropriate relationship between the focal length of the front fixed group GP1 and the focal length of the front focusing group GF1.
- the conditional equation (3) defines an appropriate relationship between the focal length of the front focusing group GF1 and the focal length of the variable magnification optical system ZL in the wide-angle end state.
- conditional expression (2) If the corresponding value of the conditional expression (2) is out of the above range, it becomes difficult to obtain good optical performance when focusing on a short-distance object.
- the upper limit of the conditional expression (2) By setting the upper limit of the conditional expression (2) to 0.98, 0.96, 0.95, 0.93, 0.90, 0.88, and further 0.85, the effect of this embodiment can be obtained. It can be made more reliable. Further, by setting the lower limit of the conditional expression (2) to 0.63, 0.65, 0.68, 0.70, 0.73, 0.75, 0.76, and further 0.80, The effect of this embodiment can be made more certain.
- variable magnification optical system ZL it is desirable that the variable magnification optical system ZL according to the first embodiment and the second embodiment satisfies the following conditional expression (4). 1.20 ⁇ ft / fw ⁇ 2.00 ... (4) However, ft: focal length of the variable magnification optical system ZL in the telephoto end state fw: focal length of the variable magnification optical system ZL in the wide-angle end state.
- Conditional expression (4) defines an appropriate range for the magnification ratio of the variable magnification optical system ZL.
- conditional expression (4) exceeds the upper limit value, it becomes difficult to correct curvature of field in at least a part of the scaling range.
- the scaling ratio of the scaling optical system ZL becomes too small, so that it cannot be used as a scaling optical system (zoom lens).
- variable magnification optical system ZL satisfies the following conditional expression (5). 0.01 ⁇ Bfw / TLw ⁇ 0.20 ... (5)
- Bfw the back focus of the variable magnification optical system ZL in the wide-angle end state
- TLw the total length of the variable magnification optical system ZL in the wide-angle end state.
- Conditional expression (5) defines an appropriate relationship between the back focus of the variable magnification optical system ZL in the wide-angle end state and the total length of the variable magnification optical system ZL in the wide-angle end state.
- the corresponding value of the conditional expression (5) When the corresponding value of the conditional expression (5) is less than the lower limit value, the total length of the variable magnification optical system ZL becomes large, so that it becomes difficult to correct the curvature of field while reducing the size of the variable magnification optical system ZL.
- the lower limit of the conditional expression (5) By setting the lower limit of the conditional expression (5) to 0.02, 0.04, 0.05, 0.06, and further 0.07, the effect of each embodiment can be further ensured. can.
- variable magnification optical system ZL satisfies the following conditional expression (6). 0.60 ⁇ YLE / IHw ⁇ 1.00 ... (6)
- YLE the effective diameter of the lens arranged on the most image side of the variable magnification optical system ZL
- IHw the maximum image height of the variable magnification optical system ZL in the wide-angle end state.
- the conditional expression (6) defines an appropriate relationship between the effective diameter of the lens arranged on the most image side of the variable magnification optical system ZL and the maximum image height of the variable magnification optical system ZL in the wide-angle end state. ..
- the lens arranged on the image side of the variable magnification optical system ZL may be referred to as a final lens.
- the effective diameter of the final lens indicates the effective diameter of the final lens on the image side of the lens surface in the wide-angle end state.
- the effective diameter of the final lens becomes large, and it becomes difficult to correct the curvature of field while reducing the size of the variable magnification optical system ZL.
- the upper limit of the conditional expression (6) 0.96, 0.95, 0.93, 0.90, 0.88, and further 0.85, the effect of each embodiment is more reliable. Can be.
- the effective diameter of the final lens becomes small, and it becomes difficult to correct the curvature of field.
- the lower limit of the conditional expression (6) 0.65, 0.70, 0.73, 0.75, 0.78, and further 0.80, the effect of each embodiment is more reliable. Can be.
- variable magnification optical system ZL satisfies the following conditional expression (7).
- FNOw F number of the variable magnification optical system ZL in the wide-angle end state.
- Conditional expression (7) defines an appropriate range for the F number of the variable magnification optical system ZL in the wide-angle end state. Satisfying the conditional expression (7) is preferable because a bright variable magnification optical system can be obtained.
- the upper limit of the conditional expression (7) may be larger than 1.20, 1.40, 1.50, and further 1.80.
- variable magnification optical system ZL satisfies the following conditional expression (8). 10.00 ° ⁇ 2 ⁇ w ⁇ 35.00 ° ⁇ ⁇ ⁇ (8)
- 2 ⁇ w the total angle of view of the variable magnification optical system ZL in the wide-angle end state.
- Conditional expression (8) defines an appropriate range for the entire angle of view of the variable magnification optical system ZL in the wide-angle end state. Satisfying the conditional expression (8) is preferable because a variable magnification optical system in the medium telephoto range can be obtained.
- the upper limit of the conditional expression (8) 32.00 °, 30.00 °, 29.00 °, and further 28.00 °
- the effect of each embodiment can be further ensured.
- the lower limit of the conditional expression (8) By setting the lower limit of the conditional expression (8) to 15.00 °, 20.00 °, 24.00 °, and further 27.00 °, the effect of each embodiment can be further ensured. can.
- variable magnification optical system ZL satisfies the following conditional expression (9). 0.30 ⁇ fw / f1 ⁇ 0.70 ... (9)
- fw focal length of the variable magnification optical system ZL in the wide-angle end state
- f1 focal length of the first lens group G1.
- Conditional expression (9) defines an appropriate relationship between the focal length of the variable magnification optical system ZL in the wide-angle end state and the focal length of the first lens group G1. By satisfying the conditional expression (9), spherical aberration can be satisfactorily corrected over the entire range of scaling.
- conditional expression (9) exceeds the upper limit value, the refractive power (power) of the first lens group G1 is too strong, and it becomes difficult to correct the spherical aberration.
- the upper limit of the conditional expression (9) 0.68, 0.65, 0.62, 0.58, and further 0.55, the effect of each embodiment can be further ensured. can.
- the plurality of lens groups of the rear group GR are the second lens group G2 having a positive refractive power arranged on the most object side of the rear group GR. It is desirable that the following conditional expression (10) is satisfied. 0.30 ⁇ f2 / fRw ⁇ 0.65 ... (10) However, f2: focal length of the second lens group G2 fRw: combined focal length of the rear group GR in the wide-angle end state.
- Conditional expression (10) defines an appropriate relationship between the focal length of the second lens group G2 and the combined focal length of the rear group GR in the wide-angle end state. By satisfying the conditional equation (10), spherical aberration can be satisfactorily corrected over the entire range of scaling.
- the refractive power (power) of the second lens group G2 is too weak, and it becomes difficult to correct the curvature of field.
- the refractive power of the second lens group G2 is too strong, and it becomes difficult to correct the spherical aberration.
- the lower limit of the conditional expression (10) is 0.32, 0.34, 0.35, 0.36, 0.38, and further 0.40, the effect of each embodiment is more reliable. Can be.
- the plurality of lens groups of the rear group GR include the final lens group GE arranged on the most image side of the rear group GR, and the following conditional expression is used. It is desirable to satisfy (11). 0.50 ⁇ (-fGE) / fw ⁇ 1.00 ... (11) However, fGE: focal length of the final lens group GE fw: focal length of the variable magnification optical system ZL in the wide-angle end state.
- Conditional expression (11) defines an appropriate relationship between the focal length of the final lens group GE and the focal length of the variable magnification optical system ZL in the wide-angle end state. By satisfying the conditional expression (11), the variable magnification optical system ZL can be miniaturized and the curvature of field can be satisfactorily corrected.
- conditional expression (11) exceeds the upper limit value, the refractive power (power) of the final lens group GE is too weak, and it becomes difficult to correct the curvature of field.
- Each implementation is carried out by setting the upper limit of the conditional expression (11) to 0.98, 0.95, 0.93, 0.90, 0.88, 0.85, 0.83, and further 0.80. The effect of the morphology can be made more certain.
- the lower limit of the conditional expression (11) is set to 0.53, 0.55, 0.58, 0.60, 0.63, 0.65, 0.68, 0.70, and further 0.72. Therefore, the effect of each embodiment can be made more certain.
- variable magnification optical system ZL satisfies the following conditional expression (12). 1.00 ⁇ (L1r2 + L1r1) / (L1r2-L1r1) ⁇ 2.50 ... (12)
- L1r1 radius of curvature of the lens surface on the object side of the lens arranged on the most object side of the variable magnification optical system ZL
- L1r2 the lens surface on the image side of the lens arranged on the most object side of the variable magnification optical system ZL. curvature radius
- Conditional expression (12) defines an appropriate range for the shape factor of the lens arranged on the most object side of the variable magnification optical system ZL. By satisfying the conditional expression (12), various aberrations such as coma can be satisfactorily corrected over the entire range of scaling.
- conditional expression (12) exceeds the upper limit value, it becomes difficult to correct the spherical aberration.
- Each implementation is carried out by setting the upper limit of the conditional expression (12) to 2.40, 2.25, 2.10, 2.00, 1.95, 1.90, 1.85, and further 1.80. The effect of the morphology can be made more certain.
- conditional expression (12) If the corresponding value of the conditional expression (12) is less than the lower limit value, it becomes difficult to correct the coma aberration.
- Each implementation is carried out by setting the lower limit of the conditional expression (12) to 1.05, 1.10, 1.15, 1.20, 1.25, 1.30, 1.35, and further 1.40. The effect of the morphology can be made more certain.
- variable magnification optical system ZL satisfies the following conditional expression (13). 1.50 ⁇ (LEr2 + LEr1) / (LEr2-LEr1) ⁇ 3.00 ... (13)
- LEr1 radius of curvature of the lens surface on the object side of the lens arranged on the most image side of the variable magnification optical system ZL
- LEr2 the lens surface on the image side of the lens arranged on the most image side of the variable magnification optical system ZL. curvature radius
- conditional expression (13) defines an appropriate range for the shape factor of the lens (final lens) arranged on the image side of the variable magnification optical system ZL.
- conditional expression (13) If the corresponding value of the conditional expression (13) is less than the lower limit value, it becomes difficult to correct the coma aberration.
- Each implementation is carried out by setting the lower limit of the conditional expression (13) to 1.60, 1.65, 1.75, 1.80, 1.85, 1.90, 1.95, and 2.00. The effect of the morphology can be made more certain.
- variable magnification optical system ZL satisfies the following conditional expression (14). 1.00 ⁇ f1 / fRw ⁇ 1.80 ... (14) However, f1: focal length of the first lens group G1 fRw: combined focal length of the rear group GR in the wide-angle end state.
- Conditional expression (14) defines an appropriate relationship between the focal length of the first lens group G1 and the combined focal length of the rear group GR in the wide-angle end state.
- the refractive power (power) of the first lens group G1 is too weak, so that the variable magnification optical system ZL becomes large. Therefore, it becomes difficult to correct spherical aberration while reducing the size of the variable magnification optical system ZL.
- the upper limit of the conditional expression (14) is 1.75, 1.70, 1.68, 1.65, 1.63, and further 1.60, the effect of each embodiment is more reliable. Can be.
- the corresponding value of the conditional expression (14) is less than the lower limit value, the refractive power of the first lens group G1 is too strong, and it becomes difficult to correct the spherical aberration.
- the lower limit of the conditional expression (14) is 1.03, 1.05, 1.08, and further 1.10, the effect of each embodiment can be further ensured.
- the plurality of lens groups of the rear group GR are the second lens group G2 having a positive refractive power arranged on the most object side of the rear group GR.
- the third lens group G3 arranged adjacent to the image side of the second lens group G2, and the second lens group G2 and the third lens at the time of scaling from the wide-angle end state to the telephoto end state. It is desirable to reduce the distance from group G3.
- variable-magnification optical system ZL has an aperture stop S arranged between the first lens group G1 and the rear group GR, and the first lens is used at the time of scaling. It is desirable that the group G1 moves along the optical axis together with the aperture stop S.
- the first lens group G1 has a front focusing group GF1 that moves along the optical axis during focusing
- the rear group GR has a rear focusing group GF1.
- It has a rear focusing group GF2 that moves along the optical axis in a trajectory different from that of the front focusing group GF1 at the time of focusing, and is one of a plurality of lens groups of the rear group GR. It is desirable that at least a part of it constitutes the posterior focusing group GF2.
- the anterior focusing group GF1 and the posterior focusing group GF2 may satisfy the following conditional expression (15). -0.30 ⁇ fF2 / fF1 ⁇ 0.30 ... (15) However, fF1: focal length of the anterior focusing group GF1 fF2: focal length of the posterior focusing group GF2
- Conditional expression (15) defines an appropriate relationship between the focal length of the anterior focusing group GF1 and the focal length of the posterior focusing group GF2.
- conditional expression (15) exceeds the upper limit value, it becomes difficult to suppress the fluctuation of the curvature of field during focusing.
- upper limit of the conditional expression (15) 0.28, 0.25, 0.25, 0.20, and further 0.18, the effect of each embodiment can be further ensured. can.
- the anterior focusing group GF1 and the posterior focusing group GF2 may satisfy the following conditional expression (16). 0.01 ⁇ fF2 / (-fF1) ⁇ 0.30 ... (16) However, fF1: focal length of the anterior focusing group GF1 fF2: focal length of the posterior focusing group GF2
- Conditional expression (16) defines an appropriate relationship between the focal length of the anterior focusing group GF1 and the focal length of the posterior focusing group GF2.
- conditional expression (16) exceeds the upper limit value, it becomes difficult to suppress the fluctuation of the curvature of field during focusing.
- upper limit of the conditional expression (16) 0.28, 0.25, 0.25, 0.20, and further 0.18, the effect of each embodiment can be further ensured. can.
- a first lens group G1 having a positive refractive power and a rear group GR having a plurality of lens groups are arranged in order from the object side along the optical axis (step ST1).
- it is configured so that the distance between adjacent lens groups changes at the time of scaling step ST2.
- the second lens group G2 having a positive refractive power is arranged on the most object side of the rear group GR (step ST3).
- each lens is arranged in the lens barrel so as to satisfy at least the above conditional expression (1) (step ST4). According to such a manufacturing method, it becomes possible to manufacture a variable magnification optical system that is compact but bright and has good optical performance.
- a first lens group G1 having a positive refractive power and a rear group GR having a plurality of lens groups are arranged in order from the object side along the optical axis (step ST11).
- the first lens group G1 moves toward the object along the optical axis, and the distance between the adjacent lens groups changes. Step ST12).
- the first lens group G1 has the front fixed group GP1 whose position is fixed with respect to the image plane I at the time of focusing in order from the object side along the optical axis, and the optical axis at the time of focusing.
- the front focusing group GF1 moving along the line is arranged (step ST13).
- each lens is arranged in the lens barrel so as to satisfy at least the above conditional expressions (2) and (3) (step ST14). According to such a manufacturing method, it becomes possible to manufacture a variable magnification optical system that is compact but bright and has good optical performance.
- FIG. 1, FIG. 3, FIG. 5, and FIG. 7 are cross-sectional views showing the configuration and refractive power distribution of the variable magnification optical system ZL ⁇ ZL (1) to ZL (4) ⁇ according to the first to fourth embodiments. ..
- the moving direction along the optical axis of the focusing group when focusing on a short-range object from infinity is shown. It is indicated by an arrow with the word "focus".
- variable magnification optical systems ZL (1) to ZL (4) according to the first to fourth embodiments, the magnification of each lens group when scaling from the wide-angle end state (W) to the telephoto end state (T)
- W wide-angle end state
- T telephoto end state
- 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 codes 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 lens system
- FNO is the F number
- 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 to the final surface of the lens on the optical axis at infinity, plus BF
- BF is the image from the final surface of the lens on the optical axis at infinity.
- the distance to the surface I (back focus) is shown. It should be noted that these values are shown for each of the wide-angle end (W) and the telephoto end (T) in each variable magnification state.
- YLE indicates the effective diameter of the lens (final lens) arranged on the image side of the variable magnification optical system.
- IHw indicates the maximum image height of the variable magnification optical system in the wide-angle end state.
- fP1 indicates the focal length of the anterior fixed group.
- fF1 indicates the focal length of the anterior focusing group.
- fRw indicates the composite focal length of the rear group in the wide-angle end state.
- fF2 indicates the focal length of the posterior focusing group.
- 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 numbers based on the d-line of the material of the member are shown. “ ⁇ ” of the radius of curvature indicates a plane or an opening, and (aperture S) indicates an opening aperture 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 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].
- the table of [Variable Interval Data] shows the surface spacing in the infinity focusing state and the surface spacing in the close range focusing state.
- 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. Alternatively, it 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 a variable magnification optical system according to the first embodiment.
- the variable magnification optical system ZL (1) according to the first embodiment has a first lens group G1 having a positive refractive power, an aperture aperture S, and a positive refractive power arranged in order from the object side along the optical axis. It is composed of a second lens group G2 having a negative refractive power and a third lens group G3 having a negative refractive power.
- the first lens group G1 and the third lens group G3 move toward the object along the optical axis, and the distance between adjacent lens groups. Changes. Further, at the time of scaling, the aperture stop S moves along the optical axis together with the first lens group G1, and the position of the second lens group G2 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 positive meniscus lens L11 having a convex surface facing the object side, a regular meniscus lens L12 having a convex surface facing the object side, and a convex surface facing the object side, which are arranged in order from the object side along the optical axis. It is composed of a bonded lens with a negative meniscus lens L13, a positive meniscus lens L14 with a convex surface facing the object side, and a bonded lens of a biconvex positive lens L15 and a biconcave negative lens L16.
- the second lens group G2 has a biconcave negative lens L21, a biconvex positive lens L22, a biconvex positive lens L23, and a concave surface on the object side, which are arranged in order from the object side along the optical axis. It is composed of a bonded lens with a negative meniscus lens L24 directed to the lens.
- the positive lens L23 has an aspherical lens surface on the object side.
- the third lens group G3 is a junction lens of a positive meniscus lens L31 having a concave surface facing the object side and a negative lens L32 having a biconcave shape, arranged in order from the object side along the optical axis, and the concave surface facing the object side. It is composed of a negative meniscus lens L33.
- the negative lens L32 has an aspherical lens surface on the image side.
- the image plane I is arranged on the image side of the third lens group G3.
- the second lens group G2 and the third lens group G3 form a rear group GR having a positive refractive power as a whole.
- the third lens group G3 corresponds to the final lens group GE arranged on the image side of the rear group GR.
- the negative meniscus lens L33 of the third lens group G3 corresponds to the final lens.
- the positions of the positive meniscus lens L11 of the first lens group G1, the junction lens of the positive meniscus lens L12 and the negative meniscus lens L13, and the positive meniscus lens L14 are fixed with respect to the image plane I at the time of focusing. It constitutes the front fixed group GP1.
- the junction lens of the positive lens L15 and the negative lens L16 of the first lens group G1 constitutes the front focusing group GF1 that moves along the optical axis during focusing.
- the front focusing group GF1 (the junction lens between the positive lens L15 and the negative lens L16 of the first lens group G1) moves toward the image side along the optical axis.
- Table 1 below lists the specifications of the variable magnification optical system according to the first embodiment.
- FIG. 2A is a diagram of various aberrations at infinity focusing in the wide-angle end state of the variable magnification optical system according to the first embodiment.
- FIG. 2B is an aberration diagram at infinity focusing in the telephoto end state of the variable magnification optical system according to the first embodiment.
- FNO indicates an F number
- Y indicates an image height.
- the spherical aberration diagram shows the value of the F number 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.
- variable magnification optical system according to the first embodiment has excellent imaging performance with various aberrations satisfactorily corrected from the wide-angle end state to the telephoto end state.
- FIG. 3 is a diagram showing a lens configuration of the variable magnification optical system according to the second embodiment.
- the variable magnification optical system ZL (2) according to the second embodiment has a first lens group G1 having a positive refractive power, an aperture aperture S, and a positive refractive power arranged in order from the object side along the optical axis. It is composed of a second lens group G2 having a negative refractive power and a third lens group G3 having a negative refractive power.
- the first lens group G1 and the third lens group G3 move toward the object along the optical axis, and the distance between adjacent lens groups. Changes. Further, at the time of scaling, the aperture stop S moves along the optical axis together with the first lens group G1, and the position of the second lens group G2 is fixed with respect to the image plane I.
- the first lens group G1 is a junction of a positive meniscus lens L11 having a convex surface facing the object side arranged in order from the object side along the optical axis, a biconvex positive lens L12, and a biconcave negative lens L13. It is composed of a lens, a positive meniscus lens L14 having a convex surface facing the object side, and a junction lens of a biconvex positive lens L15 and a biconcave negative lens L16.
- the second lens group G2 has a biconcave negative lens L21, a biconvex positive lens L22, a biconvex positive lens L23, and a concave surface on the object side, which are arranged in order from the object side along the optical axis. It is composed of a bonded lens with a negative meniscus lens L24 directed to the lens.
- the positive lens L23 has an aspherical lens surface on the object side.
- the third lens group G3 is a junction lens of a positive meniscus lens L31 having a concave surface facing the object side and a negative lens L32 having a biconcave shape, arranged in order from the object side along the optical axis, and the concave surface facing the object side. It is composed of a negative meniscus lens L33.
- the negative lens L32 has an aspherical lens surface on the image side.
- the image plane I is arranged on the image side of the third lens group G3.
- the second lens group G2 and the third lens group G3 form a rear group GR having a positive refractive power as a whole.
- the third lens group G3 corresponds to the final lens group GE arranged on the image side of the rear group GR.
- the negative meniscus lens L33 of the third lens group G3 corresponds to the final lens.
- the front fixed position of the positive meniscus lens L11 of the first lens group G1, the junction lens of the positive lens L12 and the negative lens L13, and the positive meniscus lens L14 with respect to the image plane I at the time of focusing is fixed. It constitutes the group GP1.
- the junction lens of the positive lens L15 and the negative lens L16 of the first lens group G1 constitutes the front focusing group GF1 that moves along the optical axis during focusing.
- the junction lens of the positive lens L23 and the negative meniscus lens L24 of the second lens group G2 constitutes the rear focusing group GF2 that moves along the optical axis during focusing.
- the front focusing group GF1 (the junction lens between the positive lens L15 and the negative lens L16 of the first lens group G1) moves toward the image side along the optical axis.
- the rear focusing group GF2 (the junction lens between the positive lens L23 of the second lens group G2 and the negative meniscus lens L24) moves toward the object along the optical axis.
- Table 2 below lists the specifications of the variable magnification optical system according to the second embodiment.
- FIG. 4A is a diagram of various aberrations at infinity focusing in the wide-angle end state of the variable magnification optical system according to the second embodiment.
- FIG. 4B is an aberration diagram at infinity focusing in the telephoto end state of the variable magnification optical system according to the second embodiment. From each aberration diagram, it can be seen that the variable magnification optical system according to the second embodiment has excellent imaging performance with various aberrations satisfactorily corrected from the wide-angle end state to the telephoto end state.
- FIG. 5 is a diagram showing a lens configuration of the variable magnification optical system according to the third embodiment.
- the variable magnification optical system ZL (3) according to the third embodiment has a first lens group G1 having a positive refractive power, an aperture aperture S, and a positive refractive power arranged in order from the object side along the optical axis. It is composed of a second lens group G2 having a positive refractive power, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a negative refractive power.
- the first lens group G1, the third lens group G3, and the fourth lens group G4 move toward the object along the optical axis and are adjacent to each other.
- the distance between each matching lens group changes.
- the aperture stop S moves along the optical axis together with the first lens group G1, and the position of the second lens group G2 is fixed with respect to the image plane I.
- the first lens group G1 is a junction of a positive meniscus lens L11 having a convex surface facing the object side arranged in order from the object side along the optical axis, a biconvex positive lens L12, and a biconcave negative lens L13. It is composed of a lens, a biconvex positive lens L14, a positive meniscus lens L15 with a concave surface facing the object side, and a junction lens of a biconcave negative lens L16.
- the second lens group G2 has a biconcave negative lens L21, a biconvex positive lens L22, a biconvex positive lens L23, and a concave surface on the object side, which are arranged in order from the object side along the optical axis. It is composed of a bonded lens with a negative meniscus lens L24 directed to the lens.
- the positive lens L23 has an aspherical lens surface on the object side.
- the third lens group G3 is composed of a junction lens of a positive meniscus lens L31 having a concave surface facing the object side and a negative meniscus lens L32 having a concave surface facing the object side arranged in order from the object side along the optical axis. ..
- the negative meniscus lens L32 has an aspherical lens surface on the image side.
- the fourth lens group G4 is composed of a negative meniscus lens L41 with a concave surface facing the object side.
- the image plane I is arranged on the image side of the fourth lens group G4.
- the second lens group G2, the third lens group G3, and the fourth lens group G4 constitute a rear group GR having a positive refractive power as a whole.
- the fourth lens group G4 corresponds to the final lens group GE arranged on the image side of the rear group GR.
- the negative meniscus lens L41 of the fourth lens group G4 corresponds to the final lens.
- the junction lens of the positive meniscus lens L15 and the negative lens L16 of the first lens group G1 constitutes the front focusing group GF1 that moves along the optical axis during focusing.
- the entire third lens group G3 constitutes the rear focusing group GF2 that moves along the optical axis during focusing.
- the front focusing group GF1 (the junction lens between the positive meniscus lens L15 and the negative lens L16 of the first lens group G1) moves toward the image side along the optical axis.
- the rear focusing group GF2 (the entire third lens group G3) moves toward the image side along the optical axis with a trajectory (movement amount) different from that of the front focusing group GF1.
- Table 3 lists the specifications of the variable magnification optical system according to the third embodiment.
- FIG. 6A is an aberration diagram at infinity focusing in the wide-angle end state of the variable magnification optical system according to the third embodiment.
- FIG. 6B is an aberration diagram at infinity focusing in the telephoto end state of the variable magnification optical system according to the third embodiment. From each aberration diagram, it can be seen that the variable magnification optical system according to the third embodiment has excellent imaging performance with various aberrations satisfactorily corrected from the wide-angle end state to the telephoto end state.
- FIG. 7 is a diagram showing a lens configuration of the variable magnification optical system according to the fourth embodiment.
- the variable magnification optical system ZL (4) according to the fourth embodiment has a first lens group G1 having a positive refractive power, an aperture aperture S, and a positive refractive power arranged in order from the object side along the optical axis. It is composed of a second lens group G2 having a negative refractive power and a third lens group G3 having a negative refractive power.
- the first lens group G1 and the third lens group G3 move toward the object along the optical axis, and the second lens group G2 emits light. It moves to the image side along the axis, and the distance between adjacent lens groups changes. Further, at the time of scaling, the aperture stop S moves along the optical axis together with the first lens group G1.
- the first lens group G1 includes a positive meniscus lens L11 having a convex surface facing the object side, a regular meniscus lens L12 having a convex surface facing the object side, and a convex surface facing the object side, which are arranged in order from the object side along the optical axis. It is composed of a bonded lens with a negative meniscus lens L13, a positive meniscus lens L14 with a convex surface facing the object side, and a bonded lens of a biconvex positive lens L15 and a biconcave negative lens L16.
- the second lens group G2 has a biconcave negative lens L21, a biconvex positive lens L22, a biconvex positive lens L23, and a concave surface on the object side, which are arranged in order from the object side along the optical axis. It is composed of a bonded lens with a negative meniscus lens L24 directed to the lens.
- the positive lens L23 has an aspherical lens surface on the object side.
- the third lens group G3 is a junction lens of a positive meniscus lens L31 having a concave surface facing the object side and a negative lens L32 having a biconcave shape, arranged in order from the object side along the optical axis, and the concave surface facing the object side. It is composed of a negative meniscus lens L33.
- the negative lens L32 has an aspherical lens surface on the image side.
- the image plane I is arranged on the image side of the third lens group G3.
- the second lens group G2 and the third lens group G3 form a rear group GR having a positive refractive power as a whole.
- the third lens group G3 corresponds to the final lens group GE arranged on the image side of the rear group GR.
- the negative meniscus lens L33 of the third lens group G3 corresponds to the final lens.
- the positions of the positive meniscus lens L11 of the first lens group G1, the junction lens of the positive meniscus lens L12 and the negative meniscus lens L13, and the positive meniscus lens L14 are fixed with respect to the image plane I at the time of focusing. It constitutes the front fixed group GP1.
- the junction lens of the positive lens L15 and the negative lens L16 of the first lens group G1 constitutes the front focusing group GF1 that moves along the optical axis during focusing.
- the front focusing group GF1 (the junction lens between the positive lens L15 and the negative lens L16 of the first lens group G1) moves toward the image side along the optical axis.
- Table 4 lists the specifications of the variable magnification optical system according to the fourth embodiment.
- FIG. 8A is an aberration diagram at infinity focusing in the wide-angle end state of the variable magnification optical system according to the fourth embodiment.
- FIG. 8B is an aberration diagram at infinity focusing in the telephoto end state of the variable magnification optical system according to the fourth embodiment. From each aberration diagram, it can be seen that the variable magnification optical system according to the fourth embodiment has excellent imaging performance with various aberrations satisfactorily corrected from the wide-angle end state to the telephoto end state.
- Conditional expression (1) 0.15 ⁇ f2 / f1 ⁇ 0.80
- Conditional expression (2) 0.60 ⁇ fP1 / (-fF1) ⁇ 1.00
- Conditional expression (3) 0.80 ⁇ (-fF1) / fw ⁇ 1.40
- Conditional expression (4) 1.20 ⁇ ft / fw ⁇ 2.00
- Conditional expression (5) 0.01 ⁇ Bfw / TLw ⁇ 0.20
- Conditional expression (6) 0.60 ⁇ YLE / IHw ⁇ 1.00
- Conditional expression (7) FNOw ⁇ 2.8
- Conditional expression (8) 10.00 ° ⁇ 2 ⁇ w ⁇ 35.00 °
- Conditional expression (9) 0.30 ⁇ fw / f1 ⁇ 0.70
- Conditional expression (10) 0.30 ⁇ f2 / fRw ⁇ 0.65
- Conditional expression (11) 0.50 ⁇ (-
- variable magnification optical system of the present embodiment a three-group configuration and a four-group configuration are shown, but the present application is not limited to this, and a variable magnification optical system having another group configuration (for example, five groups, etc.) is used. It can also be configured. Specifically, a lens or a lens group may be added to the most object side or the most image plane side of the variable magnification 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 scaling.
- It may be a focusing lens group that focuses on a short-distance object from an infinity object by moving a single lens group, a plurality of lens groups, or a partial lens group in the optical axis direction.
- the in-focus lens group can also be applied to autofocus, and is also suitable for driving a motor for autofocus (using an ultrasonic motor or the like).
- 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 first lens group and the second 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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Abstract
Description
0.15<f2/f1<0.80
但し、f1:前記第1レンズ群の焦点距離
f2:前記第2レンズ群の焦点距離
0.60<fP1/(-fF1)<1.00
0.80<(-fF1)/fw<1.40
但し、fP1:前記前側固定群の焦点距離
fF1:前記前側合焦群の焦点距離
fw:広角端状態における前記変倍光学系の焦点距離
0.15<f2/f1<0.80
但し、f1:前記第1レンズ群の焦点距離
f2:前記第2レンズ群の焦点距離
0.60<fP1/(-fF1)<1.00
0.80<(-fF1)/fw<1.40
但し、fP1:前記前側固定群の焦点距離
fF1:前記前側合焦群の焦点距離
fw:広角端状態における前記変倍光学系の焦点距離
0.15<f2/f1<0.80 ・・・(1)
但し、f1:第1レンズ群G1の焦点距離
f2:第2レンズ群G2の焦点距離
0.60<fP1/(-fF1)<1.00 ・・・(2)
0.80<(-fF1)/fw<1.40 ・・・(3)
但し、fP1:前側固定群GP1の焦点距離
fF1:前側合焦群GF1の焦点距離
fw:広角端状態における変倍光学系ZLの焦点距離
1.20<ft/fw<2.00 ・・・(4)
但し、ft:望遠端状態における変倍光学系ZLの焦点距離
fw:広角端状態における変倍光学系ZLの焦点距離
0.01<Bfw/TLw<0.20 ・・・(5)
但し、Bfw:広角端状態における変倍光学系ZLのバックフォーカス
TLw:広角端状態における変倍光学系ZLの全長
0.60<YLE/IHw<1.00 ・・・(6)
但し、YLE:変倍光学系ZLの最も像側に配置されたレンズの有効径
IHw:広角端状態における変倍光学系ZLの最大像高
FNOw<2.8 ・・・(7)
但し、FNOw:広角端状態における変倍光学系ZLのFナンバー
10.00°<2ωw<35.00° ・・・(8)
但し、2ωw:広角端状態における変倍光学系ZLの全画角
0.30<fw/f1<0.70 ・・・(9)
但し、fw:広角端状態における変倍光学系ZLの焦点距離
f1:第1レンズ群G1の焦点距離
0.30<f2/fRw<0.65 ・・・(10)
但し、f2:第2レンズ群G2の焦点距離
fRw:広角端状態における後群GRの合成焦点距離
0.50<(-fGE)/fw<1.00 ・・・(11)
但し、fGE:最終レンズ群GEの焦点距離
fw:広角端状態における変倍光学系ZLの焦点距離
1.00<(L1r2+L1r1)/(L1r2-L1r1)<2.50
・・・(12)
但し、L1r1:変倍光学系ZLの最も物体側に配置されたレンズにおける物体側のレンズ面の曲率半径
L1r2:変倍光学系ZLの最も物体側に配置されたレンズにおける像側のレンズ面の曲率半径
1.50<(LEr2+LEr1)/(LEr2-LEr1)<3.00
・・・(13)
但し、LEr1:変倍光学系ZLの最も像側に配置されたレンズにおける物体側のレンズ面の曲率半径
LEr2:変倍光学系ZLの最も像側に配置されたレンズにおける像側のレンズ面の曲率半径
1.00<f1/fRw<1.80 ・・・(14)
但し、f1:第1レンズ群G1の焦点距離
fRw:広角端状態における後群GRの合成焦点距離
-0.30<fF2/fF1<0.30 ・・・(15)
但し、fF1:前側合焦群GF1の焦点距離
fF2:後側合焦群GF2の焦点距離
0.01<fF2/(-fF1)<0.30 ・・・(16)
但し、fF1:前側合焦群GF1の焦点距離
fF2:後側合焦群GF2の焦点距離
第1実施例について、図1~図2および表1を用いて説明する。図1は、第1実施例に係る変倍光学系のレンズ構成を示す図である。第1実施例に係る変倍光学系ZL(1)は、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、開口絞りSと、正の屈折力を有する第2レンズ群G2と、負の屈折力を有する第3レンズ群G3とから構成される。広角端状態(W)から望遠端状態(T)に変倍する際、第1レンズ群G1と第3レンズ群G3とが光軸に沿って物体側へ移動し、隣り合う各レンズ群の間隔が変化する。また、変倍の際、開口絞りSは、第1レンズ群G1とともに光軸に沿って移動し、第2レンズ群G2は、像面Iに対して位置が固定される。各レンズ群記号に付けている符号(+)もしくは(-)は各レンズ群の屈折力を示し、このことは以下の全ての実施例でも同様である。
[全体諸元]
変倍比=1.497
YLE=18.000 IHw=21.600
fP1=84.022 fF1=-101.078
fRw=119.920
W T
f 87.497 130.992
FNO 1.859 2.788
2ω 27.50 18.79
Ymax 21.600 21.600
TL 119.454 149.236
Bf 9.103 24.335
[レンズ諸元]
面番号 R D nd νd
1 46.914 6.995 1.846660 23.8
2 166.537 0.200
3 47.658 7.580 1.593190 67.9
4 33336.213 2.000 1.846660 23.8
5 30.363 2.896
6 40.058 5.343 1.593190 67.9
7 165.681 (D7)
8 362.425 3.014 1.945944 18.0
9 -100.065 1.100 1.850000 27.0
10 62.769 (D10)
11 ∞ (D11) (絞りS)
12 -39.802 1.100 1.720000 43.6
13 5040.621 0.200
14 65.807 6.882 1.696800 55.5
15 -83.001 7.355
16* 254.149 7.210 1.772500 49.6
17 -39.577 1.100 1.846660 23.8
18 -60.083 (D18)
19 -412.223 4.304 1.846660 23.8
20 -59.324 1.600 1.487490 70.3
21* 87.613 8.473
22 -37.483 1.600 1.834000 37.2
23 -96.128 Bf
[非球面データ]
第16面
κ=1.0000,A4=-4.16377E-06,A6=1.34984E-10,A8=-2.63295E-12,A10=2.51738E-15
第21面
κ=1.0000,A4=-3.27383E-06,A6=-4.18982E-09,A8=2.10935E-12,A10=-1.03143E-14
[可変間隔データ]
無限遠合焦状態
W M T
焦点距離 87.497 104.995 130.992
物体距離 ∞ ∞ ∞
D7 2.675 2.675 2.675
D10 13.768 13.768 13.768
D11 4.479 17.898 34.262
D18 16.479 9.390 1.246
Bf 9.103 16.191 24.335
至近距離合焦状態
W M T
倍率 -0.085 -0.103 -0.131
物体距離 1080.047 1066.880 1050.516
D7 11.703 11.826 11.983
D10 4.740 4.617 4.460
D11 4.479 17.898 34.262
D18 16.479 9.390 1.246
Bf 9.103 16.191 24.335
[レンズ群データ]
群 始面 焦点距離
G1 1 186.610
G2 12 59.317
G3 19 -66.172
第2実施例について、図3~図4および表2を用いて説明する。図3は、第2実施例に係る変倍光学系のレンズ構成を示す図である。第2実施例に係る変倍光学系ZL(2)は、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、開口絞りSと、正の屈折力を有する第2レンズ群G2と、負の屈折力を有する第3レンズ群G3とから構成される。広角端状態(W)から望遠端状態(T)に変倍する際、第1レンズ群G1と第3レンズ群G3とが光軸に沿って物体側へ移動し、隣り合う各レンズ群の間隔が変化する。また、変倍の際、開口絞りSは、第1レンズ群G1とともに光軸に沿って移動し、第2レンズ群G2は、像面Iに対して位置が固定される。
[全体諸元]
変倍比=1.499
YLE=18.000 IHw=21.600
fP1=82.997 fF1=-99.080
fRw=118.936 fF2=671.573
W T
f 87.387 131.002
FNO 1.859 2.791
2ω 27.48 18.77
Ymax 21.600 21.600
TL 115.452 145.326
Bf 9.106 24.310
[レンズ諸元]
面番号 R D nd νd
1 48.237 6.840 1.846660 23.8
2 176.058 0.201
3 47.311 7.706 1.593190 67.9
4 -10977.113 2.000 1.846660 23.8
5 30.989 2.743
6 40.022 5.341 1.593190 67.9
7 158.515 (D7)
8 288.236 3.092 1.945944 18.0
9 -101.965 1.100 1.850000 27.0
10 58.937 (D10)
11 ∞ (D11) (絞りS)
12 -38.826 1.100 1.720000 43.6
13 1908.000 0.200
14 63.919 7.360 1.696800 55.5
15 -78.285 (D15)
16* 305.745 7.228 1.772500 49.6
17 -38.870 1.100 1.846660 23.8
18 -58.392 (D18)
19 -329.356 4.313 1.846660 23.8
20 -57.876 1.600 1.487490 70.3
21* 88.263 8.353
22 -38.199 1.600 1.834000 37.2
23 -96.156 Bf
[非球面データ]
第16面
κ=1.0000,A4=-4.42907E-06,A6=2.27606E-10,A8=-3.87693E-12,A10=4.36472E-15
第21面
κ=1.0000,A4=-3.09349E-06,A6=-4.12964E-09,A8=3.11255E-12,A10=-9.85811E-15
[可変間隔データ]
無限遠合焦状態
W M T
焦点距離 87.387 105.000 131.002
物体距離 ∞ ∞ ∞
D7 2.600 2.600 2.600
D10 13.859 13.859 13.859
D11 4.529 18.085 34.404
D15 6.736 6.736 6.736
D18 16.744 9.652 1.541
Bf 9.106 16.198 24.310
至近距離合焦状態
W M T
倍率 -0.105 -0.128 -0.160
物体距離 880.077 866.739 850.411
D7 12.676 13.336 12.579
D10 3.783 3.123 3.881
D11 4.529 18.085 34.404
D15 6.092 6.334 5.007
D18 17.389 10.053 3.269
Bf 9.106 16.199 24.310
[レンズ群データ]
群 始面 焦点距離
G1 1 185.733
G2 12 58.900
G3 19 -66.353
第3実施例について、図5~図6および表3を用いて説明する。図5は、第3実施例に係る変倍光学系のレンズ構成を示す図である。第3実施例に係る変倍光学系ZL(3)は、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、開口絞りSと、正の屈折力を有する第2レンズ群G2と、正の屈折力を有する第3レンズ群G3と、負の屈折力を有する第4レンズ群G4とから構成される。広角端状態(W)から望遠端状態(T)に変倍する際、第1レンズ群G1と第3レンズ群G3と第4レンズ群G4とが光軸に沿って物体側へ移動し、隣り合う各レンズ群の間隔が変化する。また、変倍の際、開口絞りSは、第1レンズ群G1とともに光軸に沿って移動し、第2レンズ群G2は、像面Iに対して位置が固定される。
[全体諸元]
変倍比=1.497
YLE=18.000 IHw=21.600
fP1=74.366 fF1=-90.157
fRw=147.649 fF2=2886.045
W T
f 87.500 131.001
FNO 1.858 2.786
2ω 27.43 18.80
Ymax 21.600 21.600
TL 116.222 142.023
Bf 9.251 25.667
[レンズ諸元]
面番号 R D nd νd
1 56.682 6.478 1.846660 23.8
2 318.773 0.200
3 50.234 8.612 1.593190 67.9
4 -271.667 1.200 1.854779 24.8
5 37.409 4.817
6 44.054 6.278 1.497820 82.6
7 -2142.172 (D7)
8 -369.420 3.507 1.922860 20.9
9 -52.787 1.100 1.770470 29.7
10 67.323 (D10)
11 ∞ (D11) (絞りS)
12 -34.128 1.100 1.723420 38.0
13 306.831 0.200
14 92.900 6.152 1.834810 42.7
15 -56.452 4.410
16* 875.397 9.115 1.693430 53.3
17 -26.311 1.100 1.850260 32.4
18 -44.283 (D18)
19 -132.378 3.586 1.846660 23.8
20 -50.802 1.600 1.588870 61.1
21* -371.956 (D21)
22 -29.395 1.600 1.693500 53.2
23 -86.978 Bf
[非球面データ]
第16面
κ=1.0000,A4=-4.22271E-06,A6=-3.12823E-10,A8=-1.96537E-12,A10=2.59367E-15
第21面
κ=1.0000,A4=-6.06022E-06,A6=-5.54411E-09,A8=-1.79582E-12,A10=-6.81506E-15
[可変間隔データ]
無限遠合焦状態
W M T
焦点距離 87.500 105.000 131.001
物体距離 ∞ ∞ ∞
D7 2.737 2.737 2.737
D10 12.555 12.555 12.555
D11 4.854 16.294 30.654
D18 17.472 10.297 2.001
D21 8.299 7.849 7.354
Bf 9.251 16.876 25.667
至近距離合焦状態
W M T
倍率 -0.104 -0.127 -0.161
物体距離 880.418 868.885 854.626
D7 11.412 11.574 11.749
D10 3.881 3.719 3.543
D11 4.854 16.294 30.654
D18 19.896 11.712 3.066
D21 5.875 6.434 6.289
Bf 9.283 16.924 25.744
[レンズ群データ]
群 始面 焦点距離
G1 1 163.682
G2 12 62.062
G3 19 2886.045
G4 22 -64.759
第4実施例について、図7~図8および表4を用いて説明する。図7は、第4実施例に係る変倍光学系のレンズ構成を示す図である。第4実施例に係る変倍光学系ZL(4)は、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、開口絞りSと、正の屈折力を有する第2レンズ群G2と、負の屈折力を有する第3レンズ群G3とから構成される。広角端状態(W)から望遠端状態(T)に変倍する際、第1レンズ群G1と第3レンズ群G3とが光軸に沿って物体側へ移動し、第2レンズ群G2が光軸に沿って像側へ移動し、隣り合う各レンズ群の間隔が変化する。また、変倍の際、開口絞りSは、第1レンズ群G1とともに光軸に沿って移動する。
[全体諸元]
変倍比=1.497
YLE=18.000 IHw=21.600
fP1=82.088 fF1=-96.051
fRw=118.327
W T
f 87.500 131.000
FNO 1.860 2.785
2ω 27.51 18.80
Ymax 21.600 21.600
TL 115.456 145.509
Bf 9.105 23.679
[レンズ諸元]
面番号 R D nd νd
1 47.389 6.930 1.846660 23.8
2 168.915 0.200
3 46.629 7.713 1.593190 67.9
4 20954.696 2.000 1.846660 23.8
5 30.529 2.967
6 40.993 5.299 1.593190 67.9
7 183.696 (D7)
8 389.304 3.072 1.945944 18.0
9 -93.280 1.100 1.850000 27.0
10 60.942 (D10)
11 ∞ (D11) (絞りS)
12 -40.799 1.100 1.720000 43.6
13 6130.299 0.200
14 65.875 6.929 1.696800 55.5
15 -87.261 7.752
16* 234.100 7.362 1.772500 49.6
17 -40.329 1.100 1.846660 23.8
18 -61.665 (D18)
19 -723.265 4.425 1.846660 23.8
20 -61.965 1.600 1.487490 70.3
21* 82.427 7.649
22 -40.118 1.600 1.834000 37.2
23 -116.183 Bf
[非球面データ]
第16面
κ=1.0000,A4=-4.01821E-06,A6=3.20252E-10,A8=-3.12345E-12,A10=3.14559E-15
第21面
κ=1.0000,A4=-2.97715E-06,A6=-3.92189E-09,A8=1.79480E-12,A10=-9.46067E-15
[可変間隔データ]
無限遠合焦状態
W M T
焦点距離 87.500 105.000 131.000
物体距離 ∞ ∞ ∞
D7 2.689 2.689 2.689
D10 13.153 13.153 13.153
D11 4.613 18.735 35.490
D18 16.898 9.784 1.500
Bf 9.105 15.838 23.679
至近距離合焦状態
W M T
倍率 -0.085 -0.103 -0.130
物体距離 1084.544 1070.803 1054.491
D7 11.156 11.275 11.422
D10 4.686 4.566 4.420
D11 4.613 18.735 35.490
D18 16.898 9.784 1.500
Bf 9.105 15.838 23.679
[レンズ群データ]
群 始面 焦点距離
G1 1 187.387
G2 12 59.720
G3 19 -67.423
条件式(1) 0.15<f2/f1<0.80
条件式(2) 0.60<fP1/(-fF1)<1.00
条件式(3) 0.80<(-fF1)/fw<1.40
条件式(4) 1.20<ft/fw<2.00
条件式(5) 0.01<Bfw/TLw<0.20
条件式(6) 0.60<YLE/IHw<1.00
条件式(7) FNOw<2.8
条件式(8) 10.00°<2ωw<35.00°
条件式(9) 0.30<fw/f1<0.70
条件式(10) 0.30<f2/fRw<0.65
条件式(11) 0.50<(-fGE)/fw<1.00
条件式(12)
1.00<(L1r2+L1r1)/(L1r2-L1r1)<2.50
条件式(13)
1.50<(LEr2+LEr1)/(LEr2-LEr1)<3.00
条件式(14) 1.00<f1/fRw<1.80
条件式(15) -0.30<fF2/fF1<0.30
条件式(16) 0.01<fF2/(-fF1)<0.30
条件式 第1実施例 第2実施例 第3実施例 第4実施例
(1) 0.318 0.317 0.379 0.319
(2) 0.831 0.838 0.825 0.855
(3) 1.155 1.134 1.030 1.098
(4) 1.497 1.499 1.497 1.497
(5) 0.076 0.079 0.080 0.079
(6) 0.833 0.833 0.833 0.833
(7) 1.859 1.859 1.858 1.860
(8) 27.50 27.48 27.43 27.51
(9) 0.469 0.470 0.535 0.467
(10) 0.495 0.495 0.420 0.505
(11) 0.756 0.759 0.740 0.771
(12) 1.784 1.755 1.433 1.780
(13) 2.278 2.278 2.021 2.055
(14) 1.556 1.562 1.109 1.584
(15) ― 0.148 0.031 ―
(16) ― 0.148 0.031 ―
G3 第3レンズ群 G4 第4レンズ群
I 像面 S 開口絞り
Claims (21)
- 光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群と、複数のレンズ群を有する後群とからなり、
変倍の際に、隣り合う各レンズ群の間隔が変化し、
前記後群の前記複数のレンズ群は、前記後群の最も物体側に配置された正の屈折力を有する第2レンズ群を含み、
以下の条件式を満足する変倍光学系。
0.15<f2/f1<0.80
但し、f1:前記第1レンズ群の焦点距離
f2:前記第2レンズ群の焦点距離 - 光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群と、複数のレンズ群を有する後群とからなり、
広角端状態から望遠端状態への変倍の際に、前記第1レンズ群が光軸に沿って物体側へ移動し、隣り合う各レンズ群の間隔が変化し、
前記第1レンズ群は、光軸に沿って物体側から順に並んだ、合焦の際に像面に対して位置が固定される前側固定群と、合焦の際に光軸に沿って移動する前側合焦群とを有し、
以下の条件式を満足する変倍光学系。
0.60<fP1/(-fF1)<1.00
0.80<(-fF1)/fw<1.40
但し、fP1:前記前側固定群の焦点距離
fF1:前記前側合焦群の焦点距離
fw:広角端状態における前記変倍光学系の焦点距離 - 以下の条件式を満足する請求項1または2に記載の変倍光学系。
1.20<ft/fw<2.00
但し、ft:望遠端状態における前記変倍光学系の焦点距離
fw:広角端状態における前記変倍光学系の焦点距離 - 以下の条件式を満足する請求項1~3のいずれか一項に記載の変倍光学系。
0.01<Bfw/TLw<0.20
但し、Bfw:広角端状態における前記変倍光学系のバックフォーカス
TLw:広角端状態における前記変倍光学系の全長 - 以下の条件式を満足する請求項1~4のいずれか一項に記載の変倍光学系。
0.60<YLE/IHw<1.00
但し、YLE:前記変倍光学系の最も像側に配置されたレンズの有効径
IHw:広角端状態における前記変倍光学系の最大像高 - 以下の条件式を満足する請求項1~5のいずれか一項に記載の変倍光学系。
FNOw<2.8
但し、FNOw:広角端状態における前記変倍光学系のFナンバー - 以下の条件式を満足する請求項1~6のいずれか一項に記載の変倍光学系。
10.00°<2ωw<35.00°
但し、2ωw:広角端状態における前記変倍光学系の全画角 - 以下の条件式を満足する請求項1~7のいずれか一項に記載の変倍光学系。
0.30<fw/f1<0.70
但し、fw:広角端状態における前記変倍光学系の焦点距離
f1:前記第1レンズ群の焦点距離 - 前記後群の前記複数のレンズ群は、前記後群の最も物体側に配置された正の屈折力を有する第2レンズ群を含み、
以下の条件式を満足する請求項1~8のいずれか一項に記載の変倍光学系。
0.30<f2/fRw<0.65
但し、f2:前記第2レンズ群の焦点距離
fRw:広角端状態における前記後群の合成焦点距離 - 前記後群の前記複数のレンズ群は、前記後群の最も像側に配置された最終レンズ群を含み、
以下の条件式を満足する請求項1~9のいずれか一項に記載の変倍光学系。
0.50<(-fGE)/fw<1.00
但し、fGE:前記最終レンズ群の焦点距離
fw:広角端状態における前記変倍光学系の焦点距離 - 以下の条件式を満足する請求項1~10のいずれか一項に記載の変倍光学系。
1.00<(L1r2+L1r1)/(L1r2-L1r1)<2.50
但し、L1r1:前記変倍光学系の最も物体側に配置されたレンズにおける物体側のレンズ面の曲率半径
L1r2:前記変倍光学系の最も物体側に配置されたレンズにおける像側のレンズ面の曲率半径 - 以下の条件式を満足する請求項1~11のいずれか一項に記載の変倍光学系。
1.50<(LEr2+LEr1)/(LEr2-LEr1)<3.00
但し、LEr1:前記変倍光学系の最も像側に配置されたレンズにおける物体側のレンズ面の曲率半径
LEr2:前記変倍光学系の最も像側に配置されたレンズにおける像側のレンズ面の曲率半径 - 以下の条件式を満足する請求項1~12のいずれか一項に記載の変倍光学系。
1.00<f1/fRw<1.80
但し、f1:前記第1レンズ群の焦点距離
fRw:広角端状態における前記後群の合成焦点距離 - 前記後群の前記複数のレンズ群は、前記後群の最も物体側に配置された正の屈折力を有する第2レンズ群と、前記第2レンズ群の像側に隣り合って配置された第3レンズ群とを含み、
広角端状態から望遠端状態への変倍の際に、前記第2レンズ群と前記第3レンズ群との間隔が減少する請求項1~13のいずれか一項に記載の変倍光学系。 - 前記第1レンズ群と前記後群との間に配置された開口絞りを有し、
変倍の際に、前記第1レンズ群が前記開口絞りとともに光軸に沿って移動する請求項1~14のいずれか一項に記載の変倍光学系。 - 前記第1レンズ群は、合焦の際に光軸に沿って移動する前側合焦群を有し、
前記後群は、合焦の際に前記前側合焦群と異なる軌跡で光軸に沿って移動する後側合焦群を有し、
前記後群の前記複数のレンズ群のうち、いずれか1つのレンズ群の少なくとも一部が前記後側合焦群を構成する請求項1~15のいずれか一項に記載の変倍光学系。 - 以下の条件式を満足する請求項16に記載の変倍光学系。
-0.30<fF2/fF1<0.30
但し、fF1:前記前側合焦群の焦点距離
fF2:前記後側合焦群の焦点距離 - 以下の条件式を満足する請求項16に記載の変倍光学系。
0.01<fF2/(-fF1)<0.30
但し、fF1:前記前側合焦群の焦点距離
fF2:前記後側合焦群の焦点距離 - 請求項1~18のいずれか一項に記載の変倍光学系を備えて構成される光学機器。
- 光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群と、複数のレンズ群を有する後群とからなる変倍光学系の製造方法であって、
変倍の際に、隣り合う各レンズ群の間隔が変化し、
前記後群の前記複数のレンズ群は、前記後群の最も物体側に配置された正の屈折力を有する第2レンズ群を含み、
以下の条件式を満足するように、
レンズ鏡筒内に各レンズを配置する変倍光学系の製造方法。
0.15<f2/f1<0.80
但し、f1:前記第1レンズ群の焦点距離
f2:前記第2レンズ群の焦点距離 - 光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群と、複数のレンズ群を有する後群とからなる変倍光学系の製造方法であって、
広角端状態から望遠端状態への変倍の際に、前記第1レンズ群が光軸に沿って物体側へ移動し、隣り合う各レンズ群の間隔が変化し、
前記第1レンズ群は、光軸に沿って物体側から順に並んだ、合焦の際に像面に対して位置が固定される前側固定群と、合焦の際に光軸に沿って移動する前側合焦群とを有し、
以下の条件式を満足するように、
レンズ鏡筒内に各レンズを配置する変倍光学系の製造方法。
0.60<fP1/(-fF1)<1.00
0.80<(-fF1)/fw<1.40
但し、fP1:前記前側固定群の焦点距離
fF1:前記前側合焦群の焦点距離
fw:広角端状態における前記変倍光学系の焦点距離
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Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0588085A (ja) * | 1991-09-24 | 1993-04-09 | Asahi Optical Co Ltd | ズームレンズ |
JPH08179215A (ja) * | 1994-12-22 | 1996-07-12 | Canon Inc | ズームレンズ |
JPH08211289A (ja) * | 1995-11-10 | 1996-08-20 | Olympus Optical Co Ltd | コンパクトな高変倍率ズームレンズ |
JPH10221601A (ja) * | 1996-12-06 | 1998-08-21 | Olympus Optical Co Ltd | ズームレンズ |
JPH11223771A (ja) * | 1998-02-06 | 1999-08-17 | Nikon Corp | 可変焦点距離レンズ系 |
JPH11326764A (ja) * | 1998-05-15 | 1999-11-26 | Olympus Optical Co Ltd | ズームレンズ |
JP2002365551A (ja) * | 2001-06-06 | 2002-12-18 | Canon Inc | ズームレンズ及びそれを有する光学機器 |
-
2021
- 2021-11-04 JP JP2022571932A patent/JPWO2022137820A1/ja active Pending
- 2021-11-04 CN CN202180084625.9A patent/CN116648920A/zh active Pending
- 2021-11-04 WO PCT/JP2021/040485 patent/WO2022137820A1/ja active Application Filing
- 2021-11-04 US US18/266,594 patent/US20240201475A1/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0588085A (ja) * | 1991-09-24 | 1993-04-09 | Asahi Optical Co Ltd | ズームレンズ |
JPH08179215A (ja) * | 1994-12-22 | 1996-07-12 | Canon Inc | ズームレンズ |
JPH08211289A (ja) * | 1995-11-10 | 1996-08-20 | Olympus Optical Co Ltd | コンパクトな高変倍率ズームレンズ |
JPH10221601A (ja) * | 1996-12-06 | 1998-08-21 | Olympus Optical Co Ltd | ズームレンズ |
JPH11223771A (ja) * | 1998-02-06 | 1999-08-17 | Nikon Corp | 可変焦点距離レンズ系 |
JPH11326764A (ja) * | 1998-05-15 | 1999-11-26 | Olympus Optical Co Ltd | ズームレンズ |
JP2002365551A (ja) * | 2001-06-06 | 2002-12-18 | Canon Inc | ズームレンズ及びそれを有する光学機器 |
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