WO2017047758A1 - 変倍光学系、光学装置、撮像装置、変倍光学系の製造方法 - Google Patents
変倍光学系、光学装置、撮像装置、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
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/20—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having an additional movable lens or lens group for varying the objective focal length
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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
- G02B15/144—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only
- G02B15/1441—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive
- G02B15/144113—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having four groups only the first group being positive arranged +-++
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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
- G02B15/145—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 five groups only
- G02B15/1451—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 five groups only the first group being positive
- G02B15/145113—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 five groups only the first group being positive arranged +-++-
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
Definitions
- variable magnification optical systems suitable for photographic cameras, electronic still cameras, video cameras, etc.
- the variable power optical system as disclosed in Japanese Patent Laid-Open No. 4-293007 has not been sufficiently reduced in weight of the focusing group, and is unsuitable for speeding up the focusing operation.
- FIG. 5 is a diagram illustrating various aberrations of the variable magnification optical system according to the first example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the first example.
- FIG. 5 is a diagram illustrating various aberrations of the variable magnification optical system according to the first example. It is sectional drawing of the variable magnification optical system which concerns on 2nd Example.
- FIG. 12 is a diagram illustrating all aberrations of the variable magnification optical system according to the second example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the second example.
- FIG. 12 is a diagram illustrating all aberrations of the variable magnification optical system according to the second example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the second example.
- FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the fourth example. It is sectional drawing of the variable magnification optical system which concerns on 5th Example.
- FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the fifth example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the fifth example.
- FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the fifth example. It is sectional drawing of the variable magnification optical system which concerns on 6th Example.
- FIG. 10 is a diagram illustrating all aberrations of the variable magnification optical system according to the fourth example. It is sectional drawing of the variable magnification optical system which concerns on 6th Example.
- FIG. 10 is a diagram illustrating various aberrations of the variable magnification optical system according to the eighth example. It is a meridional lateral aberration diagram of the variable magnification optical system according to the eighth example.
- FIG. 10 is a diagram illustrating various aberrations of the variable magnification optical system according to the eighth example. It is a figure which shows the structure of the camera provided with the variable magnification optical system. It is a figure which shows the outline of the manufacturing method of a variable magnification optical system.
- the interval between the first lens group and the intermediate group, the interval between the intermediate group and the focusing group, and the interval between the focusing group and the image side group change, and Conditional expression (1) is satisfied.
- f1fw the combined focal length from the first lens group to the in-focus group in the wide-angle end state
- ff the focal length of the in-focus group
- the lens is composed of two lens components.
- the variable magnification optical system of the present embodiment includes a vibration-proof group that is movably disposed so that the image-side group includes a displacement component in a direction perpendicular to the optical axis.
- Conditional expression (1) defines the ratio of the combined focal length from the first lens group to the focusing group in the wide-angle end state and the focal length of the focusing group.
- the variable magnification optical system of the present embodiment suppresses fluctuations in various aberrations including spherical aberration when focusing from an infinitely distant object to a close object in the wide-angle end state by satisfying conditional expression (1). Can do.
- the corresponding value of the conditional expression (1) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the focusing group increases, and when focusing from an infinitely distant object to a close object in the wide-angle end state, It becomes difficult to suppress fluctuations in various aberrations including spherical aberration.
- the upper limit of conditional expression (1) it is preferable to set the upper limit of conditional expression (1) to 8.50. In order to further secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 8.00.
- the corresponding value of conditional expression (1) of the variable magnification optical system of the present embodiment is less than the lower limit value, the refractive power from the first lens group to the focusing group becomes large in the wide-angle end state, and in the wide-angle end state.
- variable magnification optical system of the present embodiment preferably has a focal length of 50 to 100 mm in the wide-angle end state.
- the focal length in the wide-angle end state is more preferably 50 to 80 mm.
- the focal length in the wide-angle end state is more preferably 50 to 75 mm.
- the image side group includes, in order from the object side, an A group having a positive refractive power, a B group having a negative refractive power, and a C group. It is desirable that In the zoom optical system according to the present embodiment, it is preferable that the distance between the A group and the B group is larger than the distance between the B group and the C group.
- variable magnification optical system of the present embodiment satisfies the following conditional expression (2).
- f1 Focal length of the first lens group
- ff Focal length of the focusing group
- Conditional expression (2) defines the ratio between the focal length of the first lens group and the focal length of the focusing group.
- the variable magnification optical system of the present embodiment can suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to a near object.
- the corresponding value of the conditional expression (2) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the focusing group increases, and spherical aberrations and the like start when focusing from an object at infinity to a near object. It becomes difficult to suppress fluctuations in various aberrations.
- the upper limit of conditional expression (2) it is preferable to set the upper limit of conditional expression (2) to 2.25.
- the corresponding value of the conditional expression (2) of the variable magnification optical system of the present embodiment is below the lower limit value, the refractive power of the first lens unit increases, and various aberrations including spherical aberration can be corrected. It becomes difficult.
- the zoom optical system according to the present embodiment it is desirable that the first lens unit moves toward the object side when zooming from the wide-angle end state to the telephoto end state.
- the overall length of the variable magnification optical system according to the present embodiment can be shortened in the wide-angle end state, and the variable magnification optical system according to the present embodiment can be reduced in size.
- the distance between the focusing group and the image side group is increased when zooming from the wide-angle end state to the telephoto end state.
- various aberrations can be corrected well during zooming. In particular, since a sufficient movement space for focusing the focusing group can be secured in the telephoto end state, spherical aberration can be favorably corrected when focusing on a short-distance object in the telephoto end state.
- variable magnification optical system of the present embodiment satisfies the following conditional expression (3).
- ff focal length of the focusing group
- fi focal length of the image side group
- Conditional expression (3) defines the ratio between the focal length of the focusing group and the focal length of the image side group.
- the variable magnification optical system of the present embodiment can suppress fluctuations in various aberrations including spherical aberration when focusing from an object at infinity to a near object.
- the corresponding value of the conditional expression (3) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the image side group increases, and it becomes difficult to correct various aberrations including coma. End up.
- conditional expression (3) it is preferable to set the upper limit of conditional expression (3) to 1.00.
- the corresponding value of conditional expression (3) of the variable magnification optical system of the present embodiment is below the lower limit value, the refractive power of the focusing group increases, and spherical aberration occurs when focusing from an object at infinity to a near object. It becomes difficult to suppress fluctuations in various aberrations including the above.
- variable magnification optical system of the present embodiment satisfies the following conditional expression (4). (4) 1.80 ⁇ fi / ( ⁇ fvr) ⁇ 5.20
- fi focal length of the image side group
- fvr focal length of the image stabilizing group
- Conditional expression (4) defines the ratio between the focal length of the image side group and the focal length of the image stabilizing group.
- the variable magnification optical system of the present embodiment can effectively suppress deterioration of optical performance during image stabilization by satisfying conditional expression (4).
- conditional expression (4) When the corresponding value of the conditional expression (4) of the variable magnification optical system of the present embodiment exceeds the upper limit value, the refractive power of the image stabilizing group increases, and the deterioration of the eccentric coma during the image stabilizing increases.
- the first lens group has at least two positive lenses. With this configuration, spherical aberration and chromatic aberration can be effectively corrected.
- the focusing group is composed of one lens component. With this configuration, the focusing group can be further reduced in size and weight.
- the focusing group is composed of a single lens. With this configuration, the focusing group can be further reduced in weight.
- the focusing group includes at least one positive lens and satisfies the following conditional expression (5).
- (5) 58.00 ⁇ FP
- ⁇ FP Abbe number in the d-line (wavelength 587.6 nm) of the positive lens included in the focusing group
- Conditional expression (5) defines the Abbe number of the positive lens included in the focusing group.
- the variable magnification optical system according to the present embodiment satisfies the conditional expression (5), and thus can suppress fluctuations in chromatic aberration during focusing from an object at infinity to an object at short distance.
- the corresponding value of conditional expression (5) of the variable magnification optical system of the present embodiment is less than the lower limit value, the occurrence of chromatic aberration in the focusing group increases, and the chromatic aberration is reduced when focusing from an object at infinity to a close object. Fluctuation will increase.
- a method of manufacturing a variable magnification optical system includes a first lens group having a positive refractive power arranged closest to the object side, and a negative refractive power arranged on the image side from the first lens group.
- An intermediate group having a positive refractive power arranged on the image side from the intermediate group and moving at the time of focusing; and a positive refractive power arranged on the image side from the focusing group.
- the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
- the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
- the third lens group G3 is composed of a biconvex positive lens L31.
- the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
- An aperture stop S is disposed between the A group G4A and the B group G4B.
- the A group G4A includes, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a biconvex positive lens L43.
- the B group G4B is composed of, in order from the object, a cemented negative lens of a biconvex positive lens L44 and a biconcave negative lens L45.
- the C group G4C includes, in order from the object side, a biconvex positive lens L46 and a negative meniscus lens L47 with a concave surface facing the object side.
- the zoom optical system In the zoom optical system according to the first example, during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, and the second lens group G2 and the second lens group G2
- the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
- the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a near object.
- the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
- the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
- the variable magnification optical system in a lens in which the focal length of the entire lens system is f and the image stabilization coefficient (the ratio of the amount of image movement on the image plane I to the amount of movement of the image stabilization group during image stabilization) is K, the angle ⁇ In order to correct the rotation blur, the vibration isolation group may be moved in the direction orthogonal to the optical axis by (f ⁇ tan ⁇ ) / K. Therefore, the variable magnification optical system according to the first example has a vibration proof coefficient of 1.06 and a focal length of 71.40 (mm) in the wide-angle end state, and therefore corrects rotational blur of 0.30 °.
- the amount of movement of the B group G4B is 0.35 (mm). In the telephoto end state, since the image stabilization coefficient is 1.86 and the focal length is 294.00 (mm), the amount of movement of the B group G4B for correcting the rotation blur of 0.20 ° is 0. 55 (mm).
- the object plane indicates the object plane
- the variable indicates the variable plane spacing
- the stop S indicates the aperture stop S
- the image plane indicates the image plane I.
- the radius of curvature r ⁇ indicates a plane.
- the description of the refractive index of air nd 1.0000 is omitted.
- FNO is the F number
- 2 ⁇ is the angle of view (unit is “°”)
- Ymax is the maximum image height
- TL is the total length of the variable magnification optical system according to the first example (from the first surface to the image surface) (Distance on the optical axis to I)
- dn indicates a variable distance between the nth surface and the (n + 1) th surface.
- W is the wide-angle end state
- M is the intermediate focal length state
- T is the telephoto end state
- infinity is when focusing on an object at infinity
- short distance indicates when focusing on a near object.
- [Lens Group Data] indicates the start surface and focal length of each lens group.
- [Conditional Expression Corresponding Value] the corresponding value of each conditional expression of the variable magnification optical system according to the first example is shown.
- the focal length f, the radius of curvature r, and other length units listed in Table 1 are generally “mm”.
- the optical system is not limited to this because an equivalent optical performance can be obtained even when proportionally enlarged or proportionally reduced.
- symbol of Table 1 described above shall be similarly used also in the table
- FIGS. 2A, 2B, and 2C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first example.
- 3A and 3B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the first example.
- FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
- 4A, 4B, and 4C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first example.
- FNO represents the F number
- Y represents the image height
- NA represents the numerical aperture
- the spherical aberration diagram shows the value of the F number FNO or the numerical aperture NA corresponding to the maximum aperture
- the astigmatism diagram and the distortion diagram show the maximum value of the image height Y
- the coma aberration diagram shows each image height. Indicates the value of.
- d indicates the aberration at the d-line (wavelength 587.6 nm)
- g indicates the aberration at the g-line (wavelength 435.8 nm).
- the solid line indicates the sagittal image plane
- the broken line indicates the meridional image plane.
- the coma aberration diagram shows coma aberration at each image height Y. Note that the same reference numerals as those in the first embodiment are used in the aberration diagrams of the respective embodiments described later.
- variable magnification optical system according to the first example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
- FIG. 5 is a sectional view of a variable magnification optical system according to the second example.
- the variable magnification optical system according to the second example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
- the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
- the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
- the third lens group G3 is composed of a biconvex positive lens L31.
- the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
- An aperture stop S is disposed between the A group G4A and the B group G4B.
- the A group G4A is composed of, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
- the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44 in order from the object side.
- the C group G4C includes, in order from the object side, a biconvex positive lens L45 and a negative meniscus lens L46 having a concave surface directed toward the object side.
- FIGS. 6A, 6B, and 6C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the second example.
- 7A and 7B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the second example.
- FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
- FIGS. 8A, 8B, and 8C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the second example.
- FIG. 9 is a sectional view of a variable magnification optical system according to the third example.
- the variable magnification optical system according to the third example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens having a positive refractive power. It consists of a group GR.
- the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
- the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
- the third lens group G3 is composed of a biconvex positive lens L31.
- the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
- An aperture stop S is disposed between the A group G4A and the B group G4B.
- the A group G4A is composed of, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
- the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44 in order from the object side.
- the C group G4C includes, in order from the object side, a biconvex positive lens L45, and a cemented negative lens of a biconcave negative lens L46 and a biconvex positive lens L47.
- the zoom optical system according to the third example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, the second lens group G2, and the second lens group G2
- the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
- the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a near object.
- the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
- the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
- the variable magnification optical system according to the third example has the image stabilization coefficient of 1.22 and the focal length of 71.40 (mm) in the wide-angle end state, the rotation blur of 0.30 ° is corrected. Therefore, the movement amount of the B-th group G4B is 0.31 (mm).
- FIGS. 10A, 10B, and 10C are graphs showing various aberrations during focusing of an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example.
- 11A and 11B respectively show meridional lateral aberrations when a vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the third example.
- FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
- 12A, 12B, and 12C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example.
- variable magnification optical system according to the third example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
- FIG. 13 is a sectional view of a variable magnification optical system according to the fourth example.
- the zoom optical system according to the fourth example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
- the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
- the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
- An aperture stop S is disposed between the A group G4A and the B group G4B.
- the A group G4A is composed of, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
- the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44 in order from the object side.
- the C group G4C includes, in order from the object side, a biconvex positive lens L45, and a cemented negative lens of a biconcave negative lens L46 and a biconvex positive lens L47.
- the zoom optical system according to the fourth example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, and the second lens group G2 and the second lens group G2
- the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
- the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a short-distance object.
- the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
- the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
- the zoom optical system according to the fourth example since the zoom optical system according to the fourth example has the image stabilization coefficient of 1.21 and the focal length of 71.40 (mm) in the wide-angle end state, it corrects rotational blur of 0.30 °. Therefore, the movement amount of the B-th group G4B is 0.31 (mm).
- 16A, 16B, and 16C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively, of the zoom optical system according to the fourth example.
- variable magnification optical system according to the fourth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
- FIG. 17 is a sectional view of a variable magnification optical system according to the fifth example.
- the variable magnification optical system according to the fifth example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
- the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
- the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
- the third lens group G3 is composed of a biconvex positive lens L31.
- the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
- An aperture stop S is disposed between the A group G4A and the B group G4B.
- the A group G4A is composed of, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
- the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L43 having a concave surface directed toward the object side and a biconcave negative lens L44 in order from the object side.
- the C group G4C includes, in order from the object side, a cemented positive lens of a biconvex positive lens L45 and a negative meniscus lens L46 having a concave surface facing the object side, and a negative meniscus lens L47 having a concave surface facing the object side.
- variable magnification optical system the distance between the first lens group G1 and the second lens group G2 and the second lens group G2 and the second lens group G2 are varied at the time of zooming between the wide-angle end state and the telephoto end state.
- the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
- the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a near object.
- variable magnification optical system image stabilization is performed by moving the B group G4B as the image stabilization group so as to include a component in a direction perpendicular to the optical axis.
- the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
- the variable magnification optical system according to the fifth example has an anti-vibration coefficient of 1.61 and a focal length of 72.10 (mm) in the wide-angle end state, it corrects rotational blur of 0.30 °. Therefore, the movement amount of the B-th group G4B is 0.23 (mm).
- FIGS. 18A, 18B, and 18C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth example.
- 19A and 19B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the fifth example.
- FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
- 20A, 20B, and 20C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth example.
- the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
- the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
- the third lens group G3 is composed of a biconvex positive lens L31.
- the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
- An aperture stop S is disposed between the A group G4A and the B group G4B.
- the A group G4A includes, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a biconvex positive lens L43.
- the B group G4B is composed of a cemented negative lens composed of a negative meniscus lens L44 having a concave surface directed toward the object side and a biconcave negative lens L45 in order from the object side.
- the C group G4C includes, in order from the object side, a biconvex positive lens L46 and a negative meniscus lens L47 with a concave surface facing the object side.
- the zoom optical system according to the sixth example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, and the second lens group G2 and the second lens group G2
- the first to fourth lens groups G1 to G4 move along the optical axis so that the distance between the third lens group G3 and the distance between the third lens group G3 and the fourth lens group G4 change.
- the third lens group G3 is moved to the image side along the optical axis as a focusing group, thereby focusing from an object at infinity to a near object.
- FIGS. 22A, 22B, and 22C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example.
- FIG. 23A and FIG. 23B are respectively meridional transverse aberrations when performing vibration isolation against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the zoom optical system according to the sixth example.
- FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
- FIGS. 24A, 24B, and 24C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom optical system according to the sixth example.
- variable magnification optical system according to the sixth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
- FIG. 25 is a sectional view of the variable magnification optical system according to the seventh example.
- the variable magnification optical system according to the seventh example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a succeeding lens having a positive refractive power. It consists of a group GR.
- the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power and a fourth lens group G4 having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
- the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
- the third lens group G3 is composed of a biconvex positive lens L31.
- the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
- An aperture stop S is disposed between the A group G4A and the B group G4B.
- the A group G4A includes, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a biconvex positive lens L43.
- the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
- the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
- the variable magnification optical system according to the seventh example has an anti-vibration coefficient of 1.61 and a focal length of 72.10 (mm) in the wide-angle end state, it corrects rotational blur of 0.30 °. Therefore, the movement amount of the B-th group G4B is 0.23 (mm).
- FIGS. 26A, 26B, and 26C are graphs showing various aberrations when the object at infinity is in focus in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the seventh example.
- FIGS. 27A and 27B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the seventh example.
- FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
- FIGS. 28A, 28B, and 28C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom optical system according to the seventh example.
- FIG. 29 is a sectional view of a variable magnification optical system according to the eighth example.
- the variable magnification optical system according to the eighth example includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a subsequent lens having a positive refractive power. It consists of a group GR.
- the succeeding group GR includes, in order from the object side, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a positive refractive power, and a fifth lens group G5 having a negative refractive power. Has been.
- the first lens group G1 includes, in order from the object side, a biconvex positive lens L11, a cemented positive lens of a negative meniscus lens L12 having a convex surface facing the object side, and a positive meniscus lens L13 having a convex surface facing the object side. Consists of.
- the second lens group G2 includes, in order from the object side, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface facing the object side, and a biconcave negative lens L23.
- the third lens group G3 is composed of a biconvex positive lens L31.
- the fourth lens group G4 includes, in order from the object side, an A group G4A having a positive refractive power, a B group G4B having a negative refractive power, and a C group G4C having a positive refractive power. ing.
- An aperture stop S is disposed between the A group G4A and the B group G4B.
- the A group G4A includes, in order from the object side, a cemented positive lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a biconvex positive lens L43.
- the B group G4B is composed of a cemented negative lens composed of a positive meniscus lens L44 having a concave surface directed toward the object side and a biconcave negative lens L45 in order from the object side.
- the C group G4C includes a biconvex positive lens L46.
- the fifth lens group G5 includes a negative meniscus lens L51 having a concave surface directed toward the object side.
- the zoom optical system according to the eighth example during zooming between the wide-angle end state and the telephoto end state, the distance between the first lens group G1 and the second lens group G2, and the second lens group G2 and the second lens group G2
- the first to fifth lens groups so that the distance between the third lens group G3, the distance between the third lens group G3 and the fourth lens group G4, and the distance between the fourth lens group G4 and the fifth lens group G5 change.
- G1 to G5 move along the optical axis.
- focusing is performed from an object at infinity to a short-distance object by moving the third lens group G3 as the focusing group toward the image side along the optical axis.
- the image stabilization is performed by moving the B group G4B as the image stabilization group so as to include the component in the direction perpendicular to the optical axis.
- the positions in the direction perpendicular to the optical axis of the A group G4A and the C group G4C are fixed.
- the variable magnification optical system according to the eighth example has the image stabilization coefficient of 1.62 and the focal length of 72.10 (mm) in the wide-angle end state, the rotation blur of 0.30 ° is corrected. Therefore, the movement amount of the B-th group G4B is 0.23 (mm).
- FIGS. 30A, 30B, and 30C are graphs showing various aberrations during focusing on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth example.
- FIG. 31A and FIG. 31B respectively show meridional lateral aberrations when vibration is prevented against 0.30 ° rotation blur at the time of focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the eighth example.
- FIG. 6 is a meridional lateral aberration diagram when a vibration is prevented against 0.20 ° rotation blur at the time of focusing on an object at infinity in the telephoto end state.
- 32A, 32B, and 32C are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the eighth example.
- variable magnification optical system according to the eighth example has excellent imaging performance by satisfactorily correcting various aberrations from the wide angle end state to the telephoto end state. It can be seen that the imaging performance is excellent even when the object is focused.
- variable magnification optical system in which the focusing group is reduced in size and weight.
- This variable power optical system allows the focusing group to be driven by a small motor or mechanical mechanism by reducing the size and weight of the focusing group, so that the focusing operation can be performed quickly and silently without increasing the size of the lens barrel. Can be achieved.
- each said Example has shown one specific example of this invention, and this invention is not limited to these.
- the following contents can be adopted as appropriate as long as the optical performance of the variable magnification optical system of the present embodiment is not impaired.
- variable magnification optical system of the present embodiment a four-group or five-group configuration is shown, but the present application is not limited to this, and a variable-magnification optical system having other group configurations (for example, six groups) is configured.
- the second lens group is shown as an intermediate group having a negative refractive power disposed on the image side from the first lens group, but this is not restrictive.
- the third lens group is shown as the focusing group having positive refractive power disposed on the image side from the second lens group as the intermediate group, but this is not restrictive.
- the fourth lens group is shown as the image side group having a positive refractive power disposed on the image side from the focusing group, but this is not restrictive.
- a lens group having a positive or negative refractive power is disposed between the first lens group and the intermediate group (second lens group), and the distance between the lens groups may change during zooming. Good.
- a lens group having positive or negative refractive power is disposed between the intermediate group (second lens group) and the focusing group (third lens group), and the distance between the lens groups changes during zooming. It is good. Further, a lens group having a positive or negative refractive power is disposed between the focusing group (third lens group) and the image side group (fourth lens group), and the distance between the lens groups changes during zooming. It is good as well.
- variable magnification optical system it is preferable to dispose the image stabilizing group on the image side from the focusing group, and it is more preferable to arrange another lens between the focusing group and the image stabilizing group.
- another lens when another lens is disposed between the focusing group and the image stabilization group, the air distance between the lens facing the object side of the image stabilization group and the image stabilization group is the air distance between the subsequent groups. Of these, it is preferable to have the largest air spacing.
- the subsequent group it is preferable to arrange an aperture stop between the focusing group and the image stabilization group, and it is more preferable to arrange the aperture stop at a position facing the object side of the image stabilization group.
- the refractive power of the C group is positive in each embodiment, but may be negative.
- the sub-combination of the feature group of each embodiment can also be an invention.
- the entire third lens group is set as the focusing group, but a part of the lens group or a plurality of lens groups may be set as the focusing group. Further, it is preferable that the focusing group has a positive refractive power. Further, the focusing group only needs to be composed of one or two lens components, and a configuration composed of one lens component is more preferable. Such a focusing group can also be applied to autofocus, and is also suitable for driving by an autofocus motor such as an ultrasonic motor, a stepping motor, or a VCM motor.
- an autofocus motor such as an ultrasonic motor, a stepping motor, or a VCM motor.
- variable magnification optical system of each of the above embodiments either the entire lens unit or a part of the lens unit is moved so as to include a component in a direction perpendicular to the optical axis as an anti-vibration group, or the optical axis is changed. It can also be set as the structure which shake-proofs by carrying out rotational movement (oscillation) to the in-plane direction including.
- the B group is a vibration proof group.
- the anti-vibration group may be composed of one cemented lens as in the above embodiments, but the number of lenses is not particularly limited, and may be composed of a single lens or a plurality of lens components. Good. Moreover, it is preferable that the vibration isolating group has a negative refractive power.
- the image stabilizing group is preferably configured by a part of one lens group, and more preferably configured by a central part obtained by dividing one lens group into three parts. Further, it is preferable that the image stabilizing group is composed of a central negative part by dividing one lens group into three parts, positive, negative, positive and negative.
- the lens surface of the lens constituting the variable magnification optical system of each of the above embodiments may be a spherical surface, a flat surface, or an aspherical surface.
- Each lens may be formed of a glass material, a resin material, or a composite of a glass material and a resin material.
- the lens surface is a spherical surface or a flat surface, it is preferable because lens processing and assembly adjustment are easy, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance.
- the lens surface is aspherical, any of aspherical surface by grinding, glass mold aspherical surface in which glass is molded into an aspherical shape, or composite aspherical surface in which resin provided on the glass surface is formed in an aspherical shape Good.
- the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
- GRIN lens gradient index lens
- an antireflection film may be provided on the lens surface of the lens constituting the variable magnification optical system of each of the above embodiments.
- flare and ghost can be reduced, and high optical performance with high contrast can be achieved.
- FIG. 33 is a diagram showing a configuration of a camera provided with the variable magnification optical system of the present embodiment.
- the camera 1 is a so-called mirrorless camera of an interchangeable lens provided with the variable magnification optical system according to the first example as the photographing lens 2.
- the camera 1 In the camera 1, light from an object (subject) (not shown) is collected by the photographing lens 2 and is on the imaging surface of the imaging unit 3 via an OLPF (Optical low pass filter) (not shown). A subject image is formed on the screen. Then, the subject image is photoelectrically converted by the photoelectric conversion element provided in the imaging unit 3 to generate an image of the subject. This image is displayed on an EVF (Electronic view finder) 4 provided in the camera 1. Thus, the photographer can observe the subject via the EVF 4. When the release button (not shown) is pressed by the photographer, the subject image generated by the imaging unit 3 is stored in a memory (not shown). In this way, the photographer can shoot the subject with the camera 1.
- OLPF Optical low pass filter
- variable magnification optical system according to the first embodiment mounted on the camera 1 as the photographing lens 2 has good optical performance as described above, and the focusing group is reduced in weight. That is, the camera 1 can realize a high speed focusing operation and good optical performance. Even if a camera equipped with the variable magnification optical system according to the second to eighth examples as the taking lens 2 is configured, the same effect as the camera 1 can be obtained. Further, even when the variable magnification optical system according to each of the above embodiments is mounted on a single-lens reflex camera that has a quick return mirror and observes a subject with a finder optical system, the same effect as the camera 1 can be obtained. it can.
- FIG. 34 is a diagram showing an outline of a manufacturing method of the variable magnification optical system of the present embodiment.
- the manufacturing method of the variable magnification optical system of the present embodiment shown in FIG. 34 includes a first lens group having a positive refractive power arranged closest to the object side, and a negative lens arranged closer to the image side than the first lens group.
- An intermediate group having a refractive power, a focusing group having a positive refractive power arranged on the image side from the intermediate group and moving during focusing, and a positive refractive power arranged on the image side from the focusing group And an interval between the first lens group and the intermediate group when zooming the first lens group, the intermediate group, the focusing group, and the image side group.
- step S2 in which the distance between the intermediate group and the focusing group and the distance between the focusing group and the image side group are changed, and the following conditional expression (1) is satisfied.
- f1fw the combined focal length from the first lens group to the focusing group in the wide-angle end state
- ff the focal length of the focusing group
- variable magnification optical system having good optical performance and reducing the weight of the focusing group for speeding up the focusing operation is manufactured. Can do.
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Abstract
Description
最も物体側に配置された正の屈折力を有する第1レンズ群と、
前記第1レンズ群より像側に配置された負の屈折力を有する中間群と、
前記中間群より像側に配置された正の屈折力を有し合焦時に移動する合焦群と、
前記合焦群より像側に配置された正の屈折力を有する像側群とを有し、
変倍時に、前記第1レンズ群と前記中間群との間隔、前記中間群と前記合焦群との間隔及び前記合焦群と前記像側群との間隔が変化し、
以下の条件式を満足する変倍光学系を提供する。
3.00<f1fw/ff<9.00
ただし、
f1fw:広角端状態における前記第1レンズ群から前記合焦群までの合成焦点距離
ff:前記合焦群の焦点距離
最も物体側に配置された正の屈折力を有する第1レンズ群と、
前記第1レンズ群より像側に配置された負の屈折力を有する中間群と、
前記中間群より像側に配置された正の屈折力を有し合焦時に移動する合焦群と、
前記合焦群より像側に配置された正の屈折力を有する像側群とを、
変倍時に、前記第1レンズ群と前記中間群との間隔、前記中間群と前記合焦群との間隔及び前記合焦群と前記像側群との間隔が変化するように配置することを含み、
以下の条件式を満足する変倍光学系の製造方法を提供する。
3.00<f1fw/ff<9.00
ただし、
f1fw:広角端状態における前記第1レンズ群から前記合焦群までの合成焦点距離
ff:前記合焦群の焦点距離
本実施形態の変倍光学系は、最も物体側に配置された正の屈折力を有する第1レンズ群と、前記第1レンズ群より像側に配置された負の屈折力を有する中間群と、前記中間群より像側に配置された正の屈折力を有し合焦時に移動する合焦群と、前記合焦群より像側に配置された正の屈折力を有する像側群とを有し、変倍時に、前記第1レンズ群と前記中間群との間隔、前記中間群と前記合焦群との間隔及び前記合焦群と前記像側群との間隔が変化し、以下の条件式(1)を満足する。
(1) 3.00<f1fw/ff<9.00
ただし、
f1fw:広角端状態における前記第1レンズ群から前記合焦群までの合成焦点距離
ff:前記合焦群の焦点距離
また本実施形態の変倍光学系は、前記合焦群が1つ又は2つのレンズ成分で構成されていることが望ましい。
また本実施形態の変倍光学系は、前記像側群が光軸に対して垂直な方向の変位成分を含むように移動可能に配置される防振群を有することが望ましい。
上記のように本実施形態の変倍光学系は、少なくとも4つのレンズ群を有し、変倍時にレンズ群同士の間隔が変化する。この構成により、変倍時に諸収差を良好に補正することができる。
また上記のように本実施形態の変倍光学系は、合焦群が1つ又は2つのレンズ成分で構成されている。これにより、合焦群の小型軽量化を図ることができる。なお、本実施形態においてレンズ成分とは単レンズ又は接合レンズをいう。また、本実施形態において、合焦群とは、合焦時に変化する空気間隔で分離された、少なくとも1枚のレンズを有する部分をいう。
また上記のように本実施形態の変倍光学系は、像側群中の防振群が光軸に対して垂直な方向の変位成分を含むように移動する。この構成により、手ブレ等による結像位置の変位を補正する、即ち防振を行うことができる。また、防振群の小径化を図ることができるとともに、防振時の光学性能の劣化を効果的に抑えることができる。なお、本実施形態において防振群とは、防振時に光軸に対して垂直方向の成分を持つように移動する部分をいう。
本実施形態の変倍光学系の条件式(1)の対応値が上限値を上回ると、合焦群の屈折力が大きくなり、広角端状態において無限遠物体から近距離物体への合焦時に球面収差をはじめとする諸収差の変動を抑えることが困難になってしまう。なお、本実施形態の効果を確実にするために、条件式(1)の上限値を8.50にすることが好ましい。また、本実施形態の効果をより確実にするために、条件式(1)の上限値を8.00にすることが好ましい。
一方、本実施形態の変倍光学系の条件式(1)の対応値が下限値を下回ると、広角端状態において第1レンズ群から合焦群までの屈折力が大きくなり、広角端状態において無限遠物体から近距離物体への合焦時に球面収差をはじめとする諸収差の変動を抑えることが困難になってしまう。なお、本実施形態の効果を確実にするために、条件式(1)の下限値を3.30にすることが好ましい。また、本実施形態の効果をより確実にするために、条件式(1)の下限値を3.60にすることが好ましい。
また本実施形態の変倍光学系は、前記像側群は、物体側から順に、正の屈折力を有する第A群と、負の屈折力を有する第B群と、第C群とから構成されることが望ましい。
また本実施形態の変倍光学系は、前記第A群と前記第B群との間隔は、前記第B群と前記第C群との間隔よりも大きいことが望ましい。
(2) 1.50<f1/ff<2.35
ただし、
f1:前記第1レンズ群の焦点距離
ff:前記合焦群の焦点距離
本実施形態の変倍光学系の条件式(2)の対応値が上限値を上回ると、合焦群の屈折力が大きくなり、無限遠物体から近距離物体への合焦時に球面収差をはじめとする諸収差の変動を抑制することが困難になってしまう。なお、本実施形態の効果を確実にするために、条件式(2)の上限値を2.30にすることが好ましい。また、本実施形態の効果をより確実にするために、条件式(2)の上限値を2.25にすることが好ましい。
一方、本実施形態の変倍光学系の条件式(2)の対応値が下限値を下回ると、第1レンズ群の屈折力が大きくなり、球面収差をはじめとする諸収差を補正することが困難になってしまう。なお、本実施形態の効果を確実にするために、条件式(2)の下限値を1.60にすることが好ましい。また、本実施形態の効果をより確実にするために、条件式(2)の下限値を1.70にすることが好ましい。
また本実施形態の変倍光学系は、広角端状態から望遠端状態への変倍時に前記合焦群と前記像側群との間隔が増加することが望ましい。この構成により、変倍時に諸収差を良好に補正することができる。特に、望遠端状態で合焦群の合焦のための移動スペースを十分に確保することができるので、望遠端状態の近距離物体合焦時に球面収差を良好に補正することができる。
(3) 0.25<ff/fi<1.10
ただし、
ff:前記合焦群の焦点距離
fi:前記像側群の焦点距離
本実施形態の変倍光学系の条件式(3)の対応値が上限値を上回ると、像側群の屈折力が大きくなり、コマ収差をはじめとする諸収差を補正することが困難になってしまう。なお、本実施形態の効果を確実にするために、条件式(3)の上限値を1.05にすることが好ましい。また、本実施形態の効果をより確実にするために、条件式(3)の上限値を1.00にすることが好ましい。
一方、本実施形態の変倍光学系の条件式(3)の対応値が下限値を下回ると、合焦群の屈折力が大きくなり、無限遠物体から近距離物体への合焦時に球面収差をはじめとする諸収差の変動を抑制することが困難になってしまう。なお、本実施形態の効果を確実にするために、条件式(3)の下限値を0.28にすることが好ましい。また、本実施形態の効果をより確実にするために、条件式(3)の下限値を0.31にすることが好ましい。
(4) 1.80<fi/(-fvr)<5.20
ただし、
fi:前記像側群の焦点距離
fvr:前記防振群の焦点距離
本実施形態の変倍光学系の条件式(4)の対応値が上限値を上回ると、防振群の屈折力が大きくなり、防振時の偏芯コマ収差の劣化が大きくなってしまう。なお、本実施形態の効果を確実にするために、条件式(4)の上限値を5.00にすることが好ましい。また、本実施形態の効果をより確実にするために、条件式(4)の上限値を4.90にすることが好ましい。
一方、本実施形態の変倍光学系の条件式(4)の対応値が下限値を下回ると、像側群の屈折力が大きくなり、コマ収差をはじめとする諸収差を補正することが困難になってしまう。また、防振群の屈折力が小さくなり、防振時の防振群の移動量が大きくなる。このため、本実施形態の変倍光学系を収容する鏡筒が大型化してしまうため好ましくない。なお、本実施形態の効果を確実にするために、条件式(4)の下限値を1.90にすることが好ましい。また、本実施形態の効果をより確実にするために、条件式(4)の下限値を2.00にすることが好ましい。
また本実施形態の変倍光学系は、前記合焦群が1つのレンズ成分で構成されていることが望ましい。この構成により、合焦群をより小型軽量化することができる。
また本実施形態の変倍光学系は、前記合焦群が1枚の単レンズで構成されていることが望ましい。この構成により、合焦群をさらに軽量化することができる。
(5) 58.00<νFP
ただし、
νFP:前記合焦群に含まれる前記正レンズのd線(波長587.6nm)におけるアッベ数
本実施形態の変倍光学系の条件式(5)の対応値が下限値を下回ると、合焦群での色収差の発生が大きくなり、無限遠物体から近距離物体への合焦時に色収差の変動が大きくなってしまう。なお、本実施形態の効果を確実にするために、条件式(5)の下限値を59.00にすることが好ましい。また、本実施形態の効果をより確実にするために、条件式(5)の下限値を60.00にすることが好ましい。
本発明の実施形態の撮像装置は、上述した構成の変倍光学系と、前記変倍光学系によって形成される像を撮像する撮像部とを備えている。
これにより、良好な光学性能を備え、合焦動作の高速化のために合焦群の軽量化を図った光学装置、撮像装置を実現することができる。
(1) 3.00<f1fw/ff<9.00
ただし、
f1fw:広角端状態における前記第1レンズ群から前記合焦群までの合成焦点距離
ff:前記合焦群の焦点距離
(第1実施例)
図1は第1実施例に係る変倍光学系の断面図である。なお、図1及び後述する図5、図9、図13、図17、図21、図25及び図29中の矢印は、広角端状態(W)から望遠端状態(T)への変倍時の各レンズ群の移動軌跡を示している。
第1実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第1レンズ群G1と、負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後続群GRとから構成されている。後続群GRは、物体側から順に、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と物体側に凸面を向けた正メニスカスレンズL22との接合負レンズと、両凹形状の負レンズL23とからなる。
第3レンズ群G3は、両凸形状の正レンズL31からなる。
第4レンズ群G4は、物体側から順に、正の屈折力を有する第A群G4Aと、負の屈折力を有する第B群G4Bと、正の屈折力を有する第C群G4Cとから構成されている。なお、第A群G4Aと第B群G4Bの間には、開口絞りSが配置されている。
第A群G4Aは、物体側から順に、両凸形状の正レンズL41と両凹形状の負レンズL42との接合正レンズと、両凸形状の正レンズL43とからなる。
第B群G4Bは、物体側から順に、両凸形状の正レンズL44と両凹形状の負レンズL45との接合負レンズからなる。
第C群G4Cは、物体側から順に、両凸形状の正レンズL46と、物体側に凹面を向けた負メニスカスレンズL47とからなる。
第1実施例に係る変倍光学系では、合焦群として第3レンズ群G3を光軸に沿って像側へ移動させることにより無限遠物体から近距離物体への合焦を行う。
ここで、レンズ全系の焦点距離がf、防振係数(防振時の防振群の移動量に対する像面I上での像の移動量の比)がKであるレンズにおいて、角度θの回転ブレを補正するためには、防振群を(f・tanθ)/Kだけ光軸と直交する方向へ移動させればよい。したがって、第1実施例に係る変倍光学系は、広角端状態において防振係数が1.06、焦点距離が71.40(mm)であるため、0.30°の回転ブレを補正するための第B群G4Bの移動量は0.35(mm)となる。また、望遠端状態においては防振係数が1.86、焦点距離が294.00(mm)であるため、0.20°の回転ブレを補正するための第B群G4Bの移動量は0.55(mm)となる。
表1において、fは焦点距離、BFはバックフォーカス(最も像側のレンズ面と像面Iとの光軸上の距離)を示す。
[面データ]において、面番号は物体側から数えた光学面の順番、rは曲率半径、dは面間隔(第n面(nは整数)と第n+1面との間隔)、ndはd線(波長587.6nm)に対する屈折率、νdはd線(波長587.6nm)に対するアッベ数をそれぞれ示している。また、物面は物体面、可変は可変の面間隔、絞りSは開口絞りS、像面は像面Iをそれぞれ示している。なお、曲率半径r=∞は平面を示している。空気の屈折率nd=1.00000の記載は省略している。
[レンズ群データ]には、各レンズ群の始面と焦点距離を示す。
[条件式対応値]には、第1実施例に係る変倍光学系の各条件式の対応値を示す。
なお、以上に述べた表1の符号は、後述する各実施例の表においても同様に用いるものとする。
[面データ]
面番号 r d nd νd
物面 ∞
1 72.3688 6.972 1.51680 63.88
2 -604.5951 0.499
3 88.4675 1.500 1.62004 36.40
4 32.5526 8.844 1.51680 63.88
5 149.4554 可変
6 -453.8182 1.000 1.69680 55.52
7 18.7304 3.761 1.80518 25.45
8 40.0562 3.501
9 -33.7169 1.000 1.69680 55.52
10 3769.5898 可変
11 91.7620 4.268 1.51680 63.88
12 -46.5887 可変
13 54.6217 5.361 1.48749 70.31
14 -31.8367 1.000 1.85026 32.35
15 829.9126 0.200
16 34.8197 4.124 1.48749 70.31
17 -190.4880 1.633
18(絞りS) ∞ 27.478
19 316.7035 2.575 1.80518 25.45
20 -37.0122 1.000 1.74400 44.81
21 28.1012 3.267
22 27.6380 3.921 1.54814 45.79
23 -54.2282 2.418
24 -22.4640 1.000 1.77250 49.62
25 -55.2971 BF
像面 ∞
[各種データ]
変倍比 4.12
W M T
f 71.4 105.0 294.0
FNO 4.17 4.18 6.38
2ω 22.84 15.30 5.48
Ymax 14.25 14.25 14.25
TL 166.32 183.64 219.32
BF 38.52 38.53 73.71
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 3.555 24.790 43.361 3.555 24.790 43.361
d10 26.610 21.614 2.000 27.368 22.723 3.114
d12 12.316 13.381 14.933 11.558 12.271 13.819
[レンズ群データ]
群 始面 f
1 1 115.478
2 6 -26.653
3 11 60.427
4 13 138.481
[条件式対応値]
(1) f1fw/ff = 6.400
(2) f1/ff = 1.911
(3) ff/fi = 0.436
(4) fi/(-fvr) = 3.064
(5) νFP = 63.88
図3A、及び図3Bはそれぞれ、第1実施例に係る変倍光学系の広角端状態における無限遠物体合焦時に0.30°の回転ブレに対して防振を行った際のメリディオナル横収差図、及び望遠端状態における無限遠物体合焦時に0.20°の回転ブレに対して防振を行った際のメリディオナル横収差図である。
図4A、図4B及び図4Cはそれぞれ、第1実施例に係る変倍光学系の広角端状態、中間焦点距離状態及び望遠端状態における近距離物体合焦時の諸収差図である。
図5は第2実施例に係る変倍光学系の断面図である。
第2実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第1レンズ群G1と、負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後続群GRとから構成されている。後続群GRは、物体側から順に、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と物体側に凸面を向けた正メニスカスレンズL22との接合負レンズと、両凹形状の負レンズL23とからなる。
第3レンズ群G3は、両凸形状の正レンズL31からなる。
第4レンズ群G4は、物体側から順に、正の屈折力を有する第A群G4Aと、負の屈折力を有する第B群G4Bと、正の屈折力を有する第C群G4Cとから構成されている。なお、第A群G4Aと第B群G4Bの間には、開口絞りSが配置されている。
第A群G4Aは、物体側から順に、両凸形状の正レンズL41と物体側に凹面を向けた負メニスカスレンズL42との接合正レンズからなる。
第B群G4Bは、物体側から順に、物体側に凹面を向けた正メニスカスレンズL43と両凹形状の負レンズL44との接合負レンズからなる。
第C群G4Cは、物体側から順に、両凸形状の正レンズL45と、物体側に凹面を向けた負メニスカスレンズL46とからなる。
第2実施例に係る変倍光学系では、合焦群として第3レンズ群G3を光軸に沿って像側へ移動させることにより無限遠物体から近距離物体への合焦を行う。
ここで、第2実施例に係る変倍光学系は、広角端状態において防振係数が1.17、焦点距離が71.35(mm)であるため、0.30°の回転ブレを補正するための第B群G4Bの移動量は0.32(mm)となる。また、望遠端状態においては防振係数が1.80、焦点距離が294.00(mm)であるため、0.20°の回転ブレを補正するための第B群G4Bの移動量は0.57(mm)となる。
以下の表2に、第2実施例に係る変倍光学系の諸元の値を掲げる。
[面データ]
面番号 r d nd νd
物面 ∞
1 84.0136 6.369 1.51680 63.88
2 -569.5201 0.287
3 111.7962 1.500 1.62004 36.40
4 36.8295 8.708 1.51680 63.88
5 239.6437 可変
6 -196.3998 1.000 1.69680 55.52
7 17.8250 4.472 1.80518 25.45
8 63.8758 2.220
9 -50.1550 1.000 1.80100 34.92
10 107.3132 可変
11 98.4276 3.799 1.51680 63.88
12 -44.7987 可変
13 33.5689 5.221 1.48749 70.31
14 -34.6171 1.000 1.75520 27.57
15 -464.1612 1.880
16(絞りS) ∞ 31.253
17 -215.7008 3.558 1.80610 40.97
18 -18.9067 1.000 1.69680 55.52
19 29.6933 2.000
20 25.4517 4.902 1.51742 52.20
21 -34.1288 6.212
22 -19.1689 1.000 1.77250 49.62
23 -46.3649 BF
像面 ∞
[各種データ]
変倍比 4.12
W M T
f 71.4 105.0 294.0
FNO 4.70 4.74 6.44
2ω 22.84 15.30 5.46
Ymax 14.25 14.25 14.25
TL 167.32 188.67 222.32
BF 38.52 39.12 64.52
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 3.000 27.419 53.254 3.000 27.419 53.254
d10 29.124 23.882 2.000 29.965 25.078 3.487
d12 9.294 10.871 15.165 8.453 9.675 13.679
[レンズ群データ]
群 始面 f
1 1 128.484
2 6 -29.436
3 11 60.115
4 13 180.542
[条件式対応値]
(1) f1fw/ff= 3.954
(2) f1/ff = 2.137
(3) ff/fi = 0.333
(4) fi/(-fvr) = 3.886
(5) νFP = 63.88
図7A、及び図7Bはそれぞれ、第2実施例に係る変倍光学系の広角端状態における無限遠物体合焦時に0.30°の回転ブレに対して防振を行った際のメリディオナル横収差図、及び望遠端状態における無限遠物体合焦時に0.20°の回転ブレに対して防振を行った際のメリディオナル横収差図である。
図8A、図8B及び図8Cはそれぞれ、第2実施例に係る変倍光学系の広角端状態、中間焦点距離状態及び望遠端状態における近距離物体合焦時の諸収差図である。
図9は第3実施例に係る変倍光学系の断面図である。
第3実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第1レンズ群G1と、負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後続群GRとから構成されている。後続群GRは、物体側から順に、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と物体側に凸面を向けた正メニスカスレンズL22との接合負レンズと、両凹形状の負レンズL23とからなる。
第3レンズ群G3は、両凸形状の正レンズL31からなる。
第4レンズ群G4は、物体側から順に、正の屈折力を有する第A群G4Aと、負の屈折力を有する第B群G4Bと、正の屈折力を有する第C群G4Cとから構成されている。なお、第A群G4Aと第B群G4Bの間には、開口絞りSが配置されている。
第A群G4Aは、物体側から順に、両凸形状の正レンズL41と物体側に凹面を向けた負メニスカスレンズL42との接合正レンズからなる。
第B群G4Bは、物体側から順に、物体側に凹面を向けた正メニスカスレンズL43と両凹形状の負レンズL44との接合負レンズからなる。
第C群G4Cは、物体側から順に、両凸形状の正レンズL45と、両凹形状の負レンズL46と両凸形状の正レンズL47との接合負レンズとからなる。
第3実施例に係る変倍光学系では、合焦群として第3レンズ群G3を光軸に沿って像側へ移動させることにより無限遠物体から近距離物体への合焦を行う。
ここで、第3実施例に係る変倍光学系は、広角端状態において防振係数が1.22、焦点距離が71.40(mm)であるため、0.30°の回転ブレを補正するための第B群G4Bの移動量は0.31(mm)となる。また、望遠端状態においては防振係数が1.79、焦点距離が294.00(mm)であるため、0.20°の回転ブレを補正するための第B群G4Bの移動量は0.57(mm)となる。
以下の表3に、第3実施例に係る変倍光学系の諸元の値を掲げる。
[面データ]
面番号 r d nd νd
物面 ∞
1 85.0462 5.776 1.51680 63.88
2 -660.6172 0.468
3 127.3802 1.500 1.62004 36.40
4 39.1726 7.903 1.51680 63.88
5 338.5447 可変
6 -132.1891 1.000 1.69680 55.52
7 19.2602 4.667 1.80518 25.45
8 76.0183 2.071
9 -54.4201 1.000 1.80100 34.92
10 119.2030 可変
11 101.6158 3.707 1.51680 63.88
12 -48.1136 可変
13 32.8274 5.339 1.48749 70.31
14 -36.1413 1.000 1.80518 25.45
15 -208.8127 1.719
16(絞りS) ∞ 20.897
17 -111.8106 3.901 1.66755 41.87
18 -18.5066 1.000 1.58913 61.22
19 35.2076 2.000
20 26.2172 5.000 1.48749 70.31
21 -44.8232 10.387
22 -18.5590 1.000 1.77250 49.62
23 39.9065 4.006 1.60342 38.03
24 -29.6411 BF
像面 ∞
[各種データ]
変倍比 4.12
W M T
f 71.4 105.0 294.0
FNO 4.68 4.76 6.45
2ω 22.80 15.28 5.44
Ymax 14.25 14.25 14.25
TL 166.39 188.89 221.32
BF 38.52 39.12 64.52
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 3.000 27.909 54.414 3.000 27.909 54.414
d10 30.861 25.246 2.000 31.772 26.533 3.581
d12 9.676 12.274 16.047 8.765 10.987 14.466
[レンズ群データ]
群 始面 f
1 1 130.814
2 6 -30.984
3 11 63.720
4 13 184.004
[条件式対応値]
(1) f1fw/ff= 3.924
(2) f1/ff = 2.063
(3) ff/fi = 0.345
(4) fi/(-fvr) = 3.433
(5) νFP = 63.88
図11A、及び図11Bはそれぞれ、第3実施例に係る変倍光学系の広角端状態における無限遠物体合焦時に0.30°の回転ブレに対して防振を行った際のメリディオナル横収差図、及び望遠端状態における無限遠物体合焦時に0.20°の回転ブレに対して防振を行った際のメリディオナル横収差図である。
図12A、図12B及び図12Cはそれぞれ、第3実施例に係る変倍光学系の広角端状態、中間焦点距離状態及び望遠端状態における近距離物体合焦時の諸収差図である。
図13は第4実施例に係る変倍光学系の断面図である。
第4実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第1レンズ群G1と、負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後続群GRとから構成されている。後続群GRは、物体側から順に、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と物体側に凸面を向けた正メニスカスレンズL22との接合負レンズと、両凹形状の負レンズL23とからなる。
第3レンズ群G3は、両凸形状の正レンズL31からなる。
第4レンズ群G4は、物体側から順に、正の屈折力を有する第A群G4Aと、負の屈折力を有する第B群G4Bと、正の屈折力を有する第C群G4Cとから構成されている。なお、第A群G4Aと第B群G4Bの間には、開口絞りSが配置されている。
第A群G4Aは、物体側から順に、両凸形状の正レンズL41と物体側に凹面を向けた負メニスカスレンズL42との接合正レンズからなる。
第B群G4Bは、物体側から順に、物体側に凹面を向けた正メニスカスレンズL43と両凹形状の負レンズL44との接合負レンズからなる。
第C群G4Cは、物体側から順に、両凸形状の正レンズL45と、両凹形状の負レンズL46と両凸形状の正レンズL47との接合負レンズとからなる。
第4実施例に係る変倍光学系では、合焦群として第3レンズ群G3を光軸に沿って像側へ移動させることにより無限遠物体から近距離物体への合焦を行う。
ここで、第4実施例に係る変倍光学系は、広角端状態において防振係数が1.21、焦点距離が71.40(mm)であるため、0.30°の回転ブレを補正するための第B群G4Bの移動量は0.31(mm)となる。また、望遠端状態においては防振係数が1.79、焦点距離が292.00(mm)であるため、0.20°の回転ブレを補正するための第B群G4Bの移動量は0.57(mm)となる。
以下の表4に、第4実施例に係る変倍光学系の諸元の値を掲げる。
[面データ]
面番号 r d nd νd
物面 ∞
1 86.4475 5.443 1.51680 63.88
2 -981.1690 0.200
3 146.3378 1.500 1.62004 36.40
4 41.2453 8.000 1.51680 63.88
5 1154.1773 可変
6 -105.1301 1.000 1.69680 55.52
7 20.4832 4.124 1.80518 25.45
8 77.3629 1.964
9 -62.6354 1.000 1.83400 37.18
10 142.2611 可変
11 123.7504 3.431 1.58913 61.22
12 -57.1062 可変
13 33.8130 5.634 1.49700 81.73
14 -38.7693 1.000 1.80518 25.45
15 -194.5892 1.688
16(絞りS) ∞ 21.000
17 -99.8095 3.775 1.66755 41.87
18 -18.8632 1.000 1.58913 61.22
19 36.8056 2.500
20 34.3226 3.724 1.51680 63.88
21 -51.2601 11.445
22 -20.6818 1.000 1.77250 49.62
23 51.2093 3.854 1.60342 38.03
24 -30.0976 BF
像面 ∞
[各種データ]
変倍比 4.09
W M T
f 71.4 100.0 292.0
FNO 4.70 4.69 6.48
2ω 22.78 16.04 5.48
Ymax 14.25 14.25 14.25
TL 169.32 189.52 221.32
BF 39.12 38.52 66.12
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 3.000 26.086 53.441 3.000 26.086 53.441
d10 32.425 27.561 2.000 33.360 28.885 3.621
d12 11.493 14.070 16.477 10.558 12.746 14.856
[レンズ群データ]
群 始面 f
1 1 128.221
2 6 -31.614
3 11 66.796
4 13 176.525
[条件式対応値]
(1) f1fw/ff= 4.017
(2) f1/ff = 1.920
(3) ff/fi = 0.378
(4) fi/(-fvr) = 3.308
(5) νFP = 61.22
図15A、及び図15Bはそれぞれ、第4実施例に係る変倍光学系の広角端状態における無限遠物体合焦時に0.30°の回転ブレに対して防振を行った際のメリディオナル横収差図、及び望遠端状態における無限遠物体合焦時に0.20°の回転ブレに対して防振を行った際のメリディオナル横収差図である。
図16A、図16B及び図16Cはそれぞれ、第4実施例に係る変倍光学系の広角端状態、中間焦点距離状態及び望遠端状態における近距離物体合焦時の諸収差図である。
図17は第5実施例に係る変倍光学系の断面図である。
第5実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第1レンズ群G1と、負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後続群GRとから構成されている。後続群GRは、物体側から順に、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と物体側に凸面を向けた正メニスカスレンズL22との接合負レンズと、両凹形状の負レンズL23とからなる。
第3レンズ群G3は、両凸形状の正レンズL31からなる。
第4レンズ群G4は、物体側から順に、正の屈折力を有する第A群G4Aと、負の屈折力を有する第B群G4Bと、正の屈折力を有する第C群G4Cとから構成されている。なお、第A群G4Aと第B群G4Bの間には、開口絞りSが配置されている。
第A群G4Aは、物体側から順に、両凸形状の正レンズL41と物体側に凹面を向けた負メニスカスレンズL42との接合正レンズからなる。
第B群G4Bは、物体側から順に、物体側に凹面を向けた正メニスカスレンズL43と両凹形状の負レンズL44との接合負レンズからなる。
第C群G4Cは、物体側から順に、両凸形状の正レンズL45と物体側に凹面を向けた負メニスカスレンズL46との接合正レンズと、物体側に凹面を向けた負メニスカスレンズL47とからなる。
第5実施例に係る変倍光学系では、合焦群として第3レンズ群G3を光軸に沿って像側へ移動させることにより無限遠物体から近距離物体への合焦を行う。
ここで、第5実施例に係る変倍光学系は、広角端状態において防振係数が1.61、焦点距離が72.10(mm)であるため、0.30°の回転ブレを補正するための第B群G4Bの移動量は0.23(mm)となる。また、望遠端状態においては防振係数が2.44、焦点距離が292.00(mm)であるため、0.20°の回転ブレを補正するための第B群G4Bの移動量は0.42(mm)となる。
以下の表5に、第5実施例に係る変倍光学系の諸元の値を掲げる。
[面データ]
面番号 r d nd νd
物面 ∞
1 90.0000 5.600 1.51680 63.88
2 -517.3850 0.200
3 123.0815 1.700 1.62004 36.40
4 39.0000 7.800 1.51680 63.88
5 324.1762 可変
6 -110.0000 1.300 1.69680 55.52
7 21.2201 3.957 1.84666 23.80
8 73.0429 1.848
9 -75.3714 1.200 1.85026 32.35
10 106.1768 可変
11 148.9696 3.374 1.58913 61.22
12 -56.4978 可変
13 28.2564 5.746 1.49700 81.73
14 -48.4258 1.200 1.84666 23.80
15 -580.3411 2.897
16(絞りS) ∞ 23.051
17 -77.0000 3.951 1.72825 28.38
18 -14.4874 1.000 1.67003 47.14
19 29.3362 2.500
20 29.8903 5.510 1.62004 36.40
21 -17.4201 1.000 1.84666 23.80
22 -35.2773 7.314
23 -22.7541 1.000 1.77250 49.62
24 -46.2730 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.70 4.63 6.53
2ω 22.62 16.08 5.50
Ymax 14.25 14.25 14.25
TL 169.32 187.97 221.32
BF 39.61 38.52 66.61
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 3.001 26.619 53.461 3.001 26.619 53.461
d10 33.373 28.524 2.000 34.372 29.969 3.698
d12 11.187 12.162 17.100 10.188 10.718 15.402
[レンズ群データ]
群 始面 f
1 1 131.155
2 6 -32.550
3 11 69.956
4 13 165.331
[条件式対応値]
(1) f1fw/ff= 4.519
(2) f1/ff = 1.902
(3) ff/fi = 0.417
(4) fi/(-fvr) = 4.755
(5) νFP = 61.22
図19A、及び図19Bはそれぞれ、第5実施例に係る変倍光学系の広角端状態における無限遠物体合焦時に0.30°の回転ブレに対して防振を行った際のメリディオナル横収差図、及び望遠端状態における無限遠物体合焦時に0.20°の回転ブレに対して防振を行った際のメリディオナル横収差図である。
図20A、図20B及び図20Cはそれぞれ、第5実施例に係る変倍光学系の広角端状態、中間焦点距離状態及び望遠端状態における近距離物体合焦時の諸収差図である。
図21は第6実施例に係る変倍光学系の断面図である。
第6実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第1レンズ群G1と、負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後続群GRとから構成されている。後続群GRは、物体側から順に、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と物体側に凸面を向けた正メニスカスレンズL22との接合負レンズと、両凹形状の負レンズL23とからなる。
第3レンズ群G3は、両凸形状の正レンズL31からなる。
第4レンズ群G4は、物体側から順に、正の屈折力を有する第A群G4Aと、負の屈折力を有する第B群G4Bと、正の屈折力を有する第C群G4Cとから構成されている。なお、第A群G4Aと第B群G4Bの間には、開口絞りSが配置されている。
第A群G4Aは、物体側から順に、両凸形状の正レンズL41と両凹形状の負レンズL42との接合正レンズと、両凸形状の正レンズL43とからなる。
第B群G4Bは、物体側から順に、物体側に凹面を向けた負メニスカスレンズL44と両凹形状の負レンズL45との接合負レンズからなる。
第C群G4Cは、物体側から順に、両凸形状の正レンズL46と、物体側に凹面を向けた負メニスカスレンズL47とからなる。
第6実施例に係る変倍光学系では、合焦群として第3レンズ群G3を光軸に沿って像側へ移動させることにより無限遠物体から近距離物体への合焦を行う。
ここで、第6実施例に係る変倍光学系は、広角端状態において防振係数が1.54、焦点距離が72.10(mm)であるため、0.30°の回転ブレを補正するための第B群G4Bの移動量は0.25(mm)となる。また、望遠端状態においては防振係数が2.42、焦点距離が292.00(mm)であるため、0.20°の回転ブレを補正するための第B群G4Bの移動量は0.42(mm)となる。
以下の表6に、第6実施例に係る変倍光学系の諸元の値を掲げる。
[面データ]
面番号 r d nd νd
物面 ∞
1 94.0000 5.600 1.51680 63.88
2 -475.5757 0.200
3 128.0000 1.700 1.62004 36.40
4 39.6000 8.000 1.51680 63.88
5 425.5305 可変
6 -190.0000 1.300 1.69680 55.52
7 20.4656 4.300 1.84666 23.80
8 66.5049 2.063
9 -61.8359 1.200 1.85026 32.35
10 109.1965 可変
11 128.7113 3.300 1.58913 61.22
12 -63.7222 可変
13 37.0000 5.400 1.49700 81.73
14 -45.9212 1.300 1.85026 32.35
15 148.3744 0.200
16 45.1050 3.600 1.48749 70.31
17 -172.8812 4.000
18(絞りS) ∞ 26.764
19 -95.3704 3.900 1.74950 35.25
20 -14.2257 1.000 1.69680 55.52
21 24.1570 2.279
22 26.2427 4.000 1.62004 36.40
23 -55.0000 2.250
24 -20.2886 1.000 1.84666 23.80
25 -34.0000 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.69 4.66 6.54
2ω 22.56 16.04 5.50
Ymax 14.25 14.25 14.25
TL 169.32 189.24 221.32
BF 38.93 38.52 65.93
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.500 25.118 52.806 2.500 25.118 52.806
d10 33.481 28.557 2.155 34.454 29.917 3.849
d12 11.047 13.692 17.068 10.075 12.332 15.373
[レンズ群データ]
群 始面 f
1 1 130.472
2 6 -32.352
3 11 72.809
4 13 142.608
[条件式対応値]
(1) f1fw/ff= 6.295
(2) f1/ff = 1.792
(3) ff/fi = 0.511
(4) fi/(-fvr) = 4.779
(5) νFP = 61.22
図23A、及び図23Bはそれぞれ、第6実施例に係る変倍光学系の広角端状態における無限遠物体合焦時に0.30°の回転ブレに対して防振を行った際のメリディオナル横収差図、及び望遠端状態における無限遠物体合焦時に0.20°の回転ブレに対して防振を行った際のメリディオナル横収差図である。
図24A、図24B及び図24Cはそれぞれ、第6実施例に係る変倍光学系の広角端状態、中間焦点距離状態及び望遠端状態における近距離物体合焦時の諸収差図である。
図25は第7実施例に係る変倍光学系の断面図である。
第7実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第1レンズ群G1と、負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後続群GRとから構成されている。後続群GRは、物体側から順に、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4とから構成されている。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と物体側に凸面を向けた正メニスカスレンズL22との接合負レンズと、両凹形状の負レンズL23とからなる。
第3レンズ群G3は、両凸形状の正レンズL31からなる。
第4レンズ群G4は、物体側から順に、正の屈折力を有する第A群G4Aと、負の屈折力を有する第B群G4Bと、正の屈折力を有する第C群G4Cとから構成されている。なお、第A群G4Aと第B群G4Bの間には、開口絞りSが配置されている。
第A群G4Aは、物体側から順に、両凸形状の正レンズL41と両凹形状の負レンズL42との接合正レンズと、両凸形状の正レンズL43とからなる。
第B群G4Bは、物体側から順に、物体側に凹面を向けた正メニスカスレンズL44と両凹形状の負レンズL45との接合負レンズからなる。
第C群G4Cは、物体側から順に、両凸形状の正レンズL46と、物体側に凹面を向けた負メニスカスレンズL47とからなる。
第7実施例に係る変倍光学系では、合焦群として第3レンズ群G3を光軸に沿って像側へ移動させることにより無限遠物体から近距離物体への合焦を行う。
ここで、第7実施例に係る変倍光学系は、広角端状態において防振係数が1.61、焦点距離が72.10(mm)であるため、0.30°の回転ブレを補正するための第B群G4Bの移動量は0.23(mm)となる。また、望遠端状態においては防振係数が2.42、焦点距離が292.00(mm)であるため、0.20°の回転ブレを補正するための第B群G4Bの移動量は0.42(mm)となる。
以下の表7に、第7実施例に係る変倍光学系の諸元の値を掲げる。
[面データ]
面番号 r d nd νd
物面 ∞
1 94.0000 5.600 1.51680 63.88
2 -477.1369 0.200
3 127.9954 1.700 1.62004 36.40
4 39.7182 8.000 1.51680 63.88
5 477.0326 可変
6 -133.8008 1.300 1.69680 55.52
7 20.5210 4.000 1.84666 23.80
8 68.1000 2.028
9 -63.5000 1.200 1.85026 32.35
10 113.2367 可変
11 102.3130 3.400 1.58913 61.22
12 -69.1650
13 39.2000 5.500 1.49700 81.73
14 -39.2000 1.300 1.85026 32.35
15 209.5771 0.200
16 50.7811 3.700 1.48749 70.31
17 -101.5494 1.393
18(絞りS) ∞ 22.905
19 -80.0000 3.300 1.80100 34.92
20 -18.0344 1.000 1.70000 48.11
21 29.8801 2.000
22 34.2607 3.800 1.60342 38.03
23 -54.3498 7.014
24 -20.2978 1.000 1.77250 49.62
25 -34.3298 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.71 4.68 6.51
2ω 22.58 16.04 5.50
Ymax 14.25 14.25 14.25
TL 169.32 188.35 221.32
BF 42.82 42.30 69.82
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.500 25.131 52.658 2.500 25.131 52.658
d10 32.209 27.505 2.151 33.116 28.781 3.756
d12 11.251 12.875 16.152 10.345 11.599 14.546
[レンズ群データ]
群 始面 f
1 1 128.381
2 6 -31.506
3 11 70.567
4 13 143.423
[条件式対応値]
(1) f1fw/ff= 6.330
(2) f1/ff = 1.819
(3) ff/fi = 0.492
(4) fi/(-fvr) = 4.048
(5) νFP = 61.22
図27A、及び図27Bはそれぞれ、第7実施例に係る変倍光学系の広角端状態における無限遠物体合焦時に0.30°の回転ブレに対して防振を行った際のメリディオナル横収差図、及び望遠端状態における無限遠物体合焦時に0.20°の回転ブレに対して防振を行った際のメリディオナル横収差図である。
図28A、図28B及び図28Cはそれぞれ、第7実施例に係る変倍光学系の広角端状態、中間焦点距離状態及び望遠端状態における近距離物体合焦時の諸収差図である。
図29は第8実施例に係る変倍光学系の断面図である。
第8実施例に係る変倍光学系は、物体側から順に、正の屈折力を有する第1レンズ群G1と、負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後続群GRとから構成されている。後続群GRは、物体側から順に、正の屈折力を有する第3レンズ群G3と、正の屈折力を有する第4レンズ群G4と、負の屈折力を有する第5レンズ群G5とから構成されている。
第2レンズ群G2は、物体側から順に、両凹形状の負レンズL21と物体側に凸面を向けた正メニスカスレンズL22との接合負レンズと、両凹形状の負レンズL23とからなる。
第3レンズ群G3は、両凸形状の正レンズL31からなる。
第4レンズ群G4は、物体側から順に、正の屈折力を有する第A群G4Aと、負の屈折力を有する第B群G4Bと、正の屈折力を有する第C群G4Cとから構成されている。なお、第A群G4Aと第B群G4Bの間には、開口絞りSが配置されている。
第A群G4Aは、物体側から順に、両凸形状の正レンズL41と両凹形状の負レンズL42との接合正レンズと、両凸形状の正レンズL43とからなる。
第B群G4Bは、物体側から順に、物体側に凹面を向けた正メニスカスレンズL44と両凹形状の負レンズL45との接合負レンズからなる。
第C群G4Cは、両凸形状の正レンズL46からなる。
第5レンズ群G5は、物体側に凹面を向けた負メニスカスレンズL51からなる。
第8実施例に係る変倍光学系では、合焦群として第3レンズ群G3を光軸に沿って像側へ移動させることにより無限遠物体から近距離物体への合焦を行う。
ここで、第8実施例に係る変倍光学系は、広角端状態において防振係数が1.62、焦点距離が72.10(mm)であるため、0.30°の回転ブレを補正するための第B群G4Bの移動量は0.23(mm)となる。また、望遠端状態においては防振係数が2.42、焦点距離が292.00(mm)であるため、0.20°の回転ブレを補正するための第B群G4Bの移動量は0.42(mm)となる。
以下の表8に、第8実施例に係る変倍光学系の諸元の値を掲げる。
[面データ]
面番号 r d nd νd
物面 ∞
1 94.0000 5.600 1.51680 63.88
2 -475.1178 0.200
3 128.0000 1.700 1.62004 36.40
4 39.6000 8.000 1.51680 63.88
5 485.7465 可変
6 -132.5210 1.300 1.69680 55.52
7 20.5172 4.000 1.84666 23.80
8 68.1000 2.042
9 -63.5000 1.200 1.85026 32.35
10 115.6235 可変
11 101.8918 3.400 1.58913 61.22
12 -69.9544 可変
13 39.2000 5.500 1.49700 81.73
14 -39.2000 1.300 1.85026 32.35
15 212.6596 0.200
16 51.4164 3.700 1.48749 70.31
17 -99.0728 1.373
18(絞りS) ∞ 23.152
19 -80.0000 3.300 1.80100 34.92
20 -17.8244 1.000 1.70000 48.11
21 29.4302 2.000
22 34.1234 3.800 1.60342 38.03
23 -54.6969 可変
24 -20.3466 1.000 1.77250 49.62
25 -34.1069 BF
像面 ∞
[各種データ]
変倍比 4.05
W M T
f 72.1 100.0 292.0
FNO 4.71 4.69 6.49
2ω 22.58 16.06 5.50
Ymax 14.25 14.25 14.25
TL 169.32 188.16 221.32
BF 43.07 42.89 70.02
W M T W M T
無限遠 無限遠 無限遠 近距離 近距離 近距離
d5 2.500 24.944 52.518 2.500 24.944 52.518
d10 32.517 27.845 2.150 33.434 29.131 3.779
d12 10.875 12.288 16.347 9.958 11.001 14.718
d23 6.586 6.430 6.515 6.586 6.430 6.515
[レンズ群データ]
群 始面 f
1 1 128.138
2 6 -31.607
3 11 70.925
4 13 71.734
5 24 -67.420
[条件式対応値]
(1) f1fw/ff= 6.215
(2) f1/ff = 1.807
(3) ff/fi = 0.989
(4) fi/(-fvr) = 2.046
(5) νFP = 61.22
図31A、及び図31Bはそれぞれ、第8実施例に係る変倍光学系の広角端状態における無限遠物体合焦時に0.30°の回転ブレに対して防振を行った際のメリディオナル横収差図、及び望遠端状態における無限遠物体合焦時に0.20°の回転ブレに対して防振を行った際のメリディオナル横収差図である。
図32A、図32B及び図32Cはそれぞれ、第8実施例に係る変倍光学系の広角端状態、中間焦点距離状態及び望遠端状態における近距離物体合焦時の諸収差図である。
また、上記各実施例では、第1レンズ群より像側に配置された負の屈折力を有する中間群として第2レンズ群を示したがこの限りではない。また、上記各実施例では、中間群としての第2レンズ群より像側に配置された正の屈折力を有する合焦群として第3レンズ群を示したがこの限りではない。また、上記各実施例では、合焦群より像側に配置された正の屈折力を有する像側群として第4レンズ群を示したがこの限りではない。具体的には、第1レンズ群と中間群(第2レンズ群)との間に、正又は負の屈折力を有するレンズ群を配置し、変倍時に各レンズ群間隔が変化することとしてもよい。また、中間群(第2レンズ群)と合焦群(第3レンズ群)との間に、正又は負の屈折力を有するレンズ群を配置し、変倍時に各レンズ群間隔が変化することとしてもよい。また、合焦群(第3レンズ群)と像側群(第4レンズ群)との間に、正又は負の屈折力を有するレンズ群を配置し、変倍時に各レンズ群間隔が変化することとしてもよい。
また、後続群は、合焦群と防振群との間に開口絞りを配置することが好ましく、防振群の物体側に対向する位置に開口絞りを配置することがより好ましい。なお、開口絞りとしての部材を設けずにレンズ枠でその役割を代用する構成としてもよい。
また、第C群の屈折力は、各実施例では正の屈折力としたが、負の屈折力としてもよい。
また、各実施例の特徴群のサブコンビネーションもまた発明となりうる。
図33は本実施形態の変倍光学系を備えたカメラの構成を示す図である。
図33に示すようにカメラ1は、撮影レンズ2として上記第1実施例に係る変倍光学系を備えたレンズ交換式の所謂ミラーレスカメラである。
また、撮影者によって不図示のレリーズボタンが押されると、撮像部3で生成された被写体の画像が不図示のメモリに記憶される。このようにして、撮影者は本カメラ1による被写体の撮影を行うことができる。
図34は本実施形態の変倍光学系の製造方法の概略を示す図である。
(1) 3.00<f1fw/ff<9.00
ただし、
f1fw:広角端状態における前記第1レンズ群から前記合焦群までの合成焦点距離
ff:前記合焦群の焦点距離
Claims (15)
- 最も物体側に配置された正の屈折力を有する第1レンズ群と、
前記第1レンズ群より像側に配置された負の屈折力を有する中間群と、
前記中間群より像側に配置された正の屈折力を有し合焦時に移動する合焦群と、
前記合焦群より像側に配置された正の屈折力を有する像側群とを有し、
変倍時に、前記第1レンズ群と前記中間群との間隔、前記中間群と前記合焦群との間隔及び前記合焦群と前記像側群との間隔が変化し、
以下の条件式を満足する変倍光学系。
3.00<f1fw/ff<9.00
ただし、
f1fw:広角端状態における前記第1レンズ群から前記合焦群までの合成焦点距離
ff:前記合焦群の焦点距離 - 前記像側群が光軸に対して垂直な方向の変位成分を含むように移動可能に配置される防振群を有する請求項1に記載の変倍光学系。
- 以下の条件式を満足する請求項1又は請求項2に記載の変倍光学系。
1.50<f1/ff<2.35
ただし、
f1:前記第1レンズ群の焦点距離
ff:前記合焦群の焦点距離 - 広角端状態から望遠端状態への変倍時に前記第1レンズ群が物体側へ移動する請求項1から請求項3のいずれか一項に記載の変倍光学系。
- 広角端状態から望遠端状態への変倍時に前記合焦群と前記像側群との間隔が増加する請求項1から請求項4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1から請求項5のいずれか一項に記載の変倍光学系。
0.25<ff/fi<1.10
ただし、
ff:前記合焦群の焦点距離
fi:前記像側群の焦点距離 - 以下の条件式を満足する請求項1から請求項6のいずれか一項に記載の変倍光学系。
1.80<fi/(-fvr)<5.20
ただし、
fi:前記像側群の焦点距離
fvr:前記防振群の焦点距離 - 前記第1レンズ群が少なくとも2枚の正レンズを有する請求項1から請求項7のいずれか一項に記載の変倍光学系。
- 前記合焦群が1つ又は2つのレンズ成分で構成されている請求項1から請求項8のいずれか一項に記載の変倍光学系。
- 前記合焦群が1つのレンズ成分で構成されている請求項1から請求項9のいずれか一項に記載の変倍光学系。
- 前記合焦群が1枚の単レンズで構成されている請求項1から請求項10のいずれか一項に記載の変倍光学系。
- 前記合焦群は、少なくとも1枚の正レンズを有し、
以下の条件式を満足する請求項1から請求項11のいずれか一項に記載の変倍光学系。
58.00<νFP
ただし、
νFP:前記合焦群に含まれる前記正レンズのd線(波長587.6nm)におけるアッベ数 - 請求項1から請求項12のいずれか一項に記載の変倍光学系を有する光学装置。
- 請求項1から請求項13のいずれか一項に記載の変倍光学系と、前記変倍光学系によって形成される像を撮像する撮像部とを備えた撮像装置。
- 最も物体側に配置された正の屈折力を有する第1レンズ群と、
前記第1レンズ群より像側に配置された負の屈折力を有する中間群と、
前記中間群より像側に配置された正の屈折力を有し合焦時に移動する合焦群と、
前記合焦群より像側に配置された正の屈折力を有する像側群とを、
変倍時に、前記第1レンズ群と前記中間群との間隔、前記中間群と前記合焦群との間隔及び前記合焦群と前記像側群との間隔が変化するように配置することを含み、
以下の条件式を満足する変倍光学系の製造方法。
3.00<f1fw/ff<9.00
ただし、
f1fw:広角端状態における前記第1レンズ群から前記合焦群までの合成焦点距離
ff:前記合焦群の焦点距離
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