WO2016104771A1 - 変倍光学系、光学装置、および変倍光学系の製造方法 - Google Patents
変倍光学系、光学装置、および変倍光学系の製造方法 Download PDFInfo
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- WO2016104771A1 WO2016104771A1 PCT/JP2015/086371 JP2015086371W WO2016104771A1 WO 2016104771 A1 WO2016104771 A1 WO 2016104771A1 JP 2015086371 W JP2015086371 W JP 2015086371W WO 2016104771 A1 WO2016104771 A1 WO 2016104771A1
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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
- 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
- G02B15/16—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
- G02B15/163—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 a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—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 a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses 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
- the present invention relates to a variable magnification optical system suitable for a photographic camera, an electronic still camera, a video camera, and the like, an optical apparatus having the variable magnification optical system, and a method for manufacturing the variable magnification optical system.
- a variable magnification optical system has a first lens group having a positive refractive power disposed closest to the object side, and a negative refractive power disposed on the image side from the first lens group.
- a focusing group disposed between the first lens group and the first lens group, and a distance between the first lens group and the negative lens group is changed.
- the distance between the negative lens group and the positive lens group changes, and when focusing, the distance between the focusing group and the lens disposed at a position facing the object side of the focusing group changes, An interval between the focusing group and a lens disposed at a position facing the image side of the focusing group changes, and the focusing group
- the positive lens group includes a front group having a positive refractive power and a rear group having a negative refractive power, and the interval between the front group and the rear group is the positive lens group.
- the rear air group is composed of two lens components.
- a first lens group having a positive refractive power in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a first lens group having a positive refractive power.
- Three lens groups and a fourth lens group having a positive refractive power and during zooming, the distance between the first lens group and the second lens group changes, and the second lens group and the second lens group.
- the distance between the third lens group changes, the distance between the third lens group and the fourth lens group changes, and the third lens group moves during focusing from an object at infinity to a near object.
- the third lens group includes one lens component
- the fourth lens group includes a front group having a positive refractive power and a rear group having a negative refractive power, and the front group and the rear group
- the distance from the group is the largest air distance in the fourth lens group, and the rear group is composed of two lens components. It is to provide a variable power optical system has.
- Another aspect of the present invention provides an optical device including the above-described variable magnification optical system.
- a variable magnification optical system manufacturing method includes a first lens group having a positive refractive power disposed closest to the object side, and a negative lens disposed closer to the image side than the first lens group.
- a variable magnification optical system having a focusing group disposed between the negative lens group and the positive lens group, wherein the first lens group moves with respect to the image plane during zooming
- the first lens group and the negative lens group are arranged so that the distance between them changes, and the distance between the negative lens group and the positive lens group changes, and when focusing, the focusing group and the focusing group The distance between the lens arranged at the position facing the object side of the lens and the lens arranged at the position facing the image side of the focusing group is changed.
- the focusing group is composed of one lens component, and the positive lens group includes a front group having a positive refractive power and a rear group having a negative refractive power, and the front group and the rear group
- the interval is the largest air interval in the positive lens group, and the rear group consists of two lens components. That.
- a first lens group having a positive refractive power in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a first lens group having a positive refractive power.
- a variable magnification optical system manufacturing method having three lens groups and a fourth lens group having a positive refractive power, wherein the third lens group is composed of one lens component, and the fourth lens group is It is composed of a front group having a positive refractive power and a rear group having a negative refractive power, and the distance between the front group and the rear group is the largest air distance in the fourth lens group.
- the rear group is composed of two lens components, and the distance between the first lens group and the second lens group changes during zooming, and the second lens group and the third lens The distance between the third lens group and the fourth lens group is changed, and the distance between the third lens group and the fourth lens group is changed.
- FIG. 4 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 1 when focusing on an object at infinity, where (a) is a wide-angle end state, (b) is an intermediate focal length state, and (c) is a telephoto end state. Respectively.
- FIG. 4A is a diagram illustrating various aberrations of the zoom optical system according to the first example when focusing on a short-distance object, where FIG. Respectively.
- FIG. 4 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 1 when focusing on an object at infinity, where (a) is a wide-angle end state, (b) is an intermediate focal length state, and (c) is a telephoto end state. Respectively.
- FIG. 4A is a diagram illustrating various aberrations of the zoom optical system according to the first example when focusing on a short-
- FIG. 7 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 2 when focusing on an object at infinity, where (a) is a wide-angle end state, (b) is an intermediate focal length state, and (c) is a telephoto end state. Respectively.
- FIG. 6 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 2 when focusing on a short-distance object; Respectively. It is sectional drawing which shows the structure of the variable magnification optical system which concerns on 3rd Example.
- FIG. 10 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 3 when focusing on an object at infinity, where (a) is a wide-angle end state, (b) is an intermediate focal length state, and (c) is a telephoto end state. Respectively.
- FIG. 10 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 3 when focusing on a short distance object, where (a) is a wide-angle end state, (b) is an intermediate focal length state, and (c) is a telephoto end state. Respectively. It is sectional drawing which shows the structure of the variable magnification optical system which concerns on 4th Example.
- FIG. 10 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 3 when focusing on an object at infinity, where (a) is a wide-angle end state, (b) is an intermediate focal length state, and (c) is a telephoto end state. Respectively. It is sectional
- FIG. 11 is a diagram illustrating various aberrations of the variable magnification optical system according to Example 4 when focusing on an object at infinity, where (a) is a wide-angle end state, (b) is an intermediate focal length state, and (c) is a telephoto end state. Respectively.
- FIG. 11 is a diagram illustrating various aberrations of the zoom optical system according to Example 4 when focusing on a short distance object, where (a) shows a wide-angle end state, (b) shows an intermediate focal length state, and (c) shows a telephoto end state.
- variable magnification optical system an optical apparatus, and a method for manufacturing the variable magnification optical system will be described.
- the variable magnification optical system will be described.
- variable magnification optical system includes a first lens group having a positive refractive power disposed closest to the object side, and a negative lens having a negative refractive power disposed closer to the image side than the first lens group.
- a positive lens group having at least one lens disposed on the image side of the negative lens group and moving integrally with an aperture stop, and having a positive refractive power; the negative lens group and the positive lens group;
- a focusing group disposed between the first lens group and the negative lens group during zooming, the distance between the first lens group and the negative lens group is changed.
- the interval between the negative lens group and the positive lens group changes.
- the distance between the focusing group and the lens disposed at the position facing the object side of the focusing group changes, and the focusing group and the image side of the focusing group are opposed to each other.
- the distance from the lens arranged at the position changes, and the focusing group is composed of one lens component.
- the positive lens group includes a front group having a positive refractive power and a rear group having a negative refractive power, and an interval between the front group and the rear group is the largest air space in the positive lens group. Large air spacing.
- the rear group is composed of two lens components. With this configuration, various aberrations including coma can be effectively corrected.
- variable magnification optical system includes, in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power.
- the third lens group is moved when focusing from an object at infinity to an object at a short distance, and the third lens group is composed of one lens component.
- the lens component means a cemented lens formed by joining two or more lenses or a single lens.
- the fourth lens group includes a front group having a positive refractive power and a rear group having a negative refractive power, and an interval between the front group and the rear group is the fourth lens group. It is the largest air space among the air spaces inside. With this configuration, it is possible to satisfactorily correct various aberrations including coma.
- the rear group is composed of two lens components.
- the zoom optical system preferably allows the first lens group to move to the object side during zooming from the wide-angle end state to the telephoto end state.
- the total lens length in the wide-angle end state can be shortened, and the variable magnification optical system can be reduced in size.
- variable magnification optical system includes, in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power. And a fourth lens group having positive refracting power, and at the time of zooming from the wide-angle end state to the telephoto end state, the first lens group and the second lens group Preferably, the distance is changed, the distance between the second lens group and the third lens group is changed, and the distance between the third lens group and the fourth lens group is increased. With such a configuration, it is possible to achieve good aberration correction at the time of zooming.
- variable magnification optical system satisfies the following conditional expression (1).
- (1) 0.4 ⁇ fF / ( ⁇ fR) ⁇ 0.9
- fF focal length of the front group
- fR focal length of the rear group
- Conditional expression (1) is a conditional expression for defining the ratio of the focal length of the front group and the focal length of the rear group of the fourth lens group. By satisfying conditional expression (1), various aberrations including coma can be corrected well.
- conditional expression (1) If the corresponding value of conditional expression (1) exceeds the upper limit, the refractive power of the rear group becomes strong, and it becomes difficult to correct various aberrations including coma. In order to secure the effect, it is preferable to set the upper limit value of conditional expression (1) to 0.88. In order to further secure the effect, it is preferable that the upper limit value of conditional expression (1) is 0.86.
- conditional expression (1) when the corresponding value of conditional expression (1) is below the lower limit, the refractive power of the front group becomes strong, and it becomes difficult to correct various aberrations including spherical aberration.
- variable magnification optical system includes, in order from the object side along the optical axis, a first lens group having a positive refractive power and a second lens group having a negative refractive power.
- the distance between the first lens group and the second lens group changes and the following conditional expression (2) is satisfied.
- f1 Focal length of the first lens group
- f2 Focal length of the second lens group (negative lens group)
- Conditional expression (2) is a conditional expression for defining a ratio between the focal length of the first lens group and the focal length of the second lens group (negative lens group). By satisfying conditional expression (2), it is possible to suppress fluctuations in various aberrations including spherical aberration during zooming from the wide-angle end state to the telephoto end state.
- conditional expression (2) If the corresponding value of conditional expression (2) exceeds the upper limit value, the refractive power of the second lens group becomes strong, and it becomes difficult to correct various aberrations including spherical aberration. In order to secure the effect, it is preferable to set the upper limit value of conditional expression (2) to 5.8. In order to further secure the effect, it is preferable that the upper limit value of conditional expression (2) is 5.5.
- conditional expression (2) when the corresponding value of the conditional expression (2) is below the lower limit value, the refractive power of the first lens group becomes strong, and it becomes difficult to correct various aberrations including spherical aberration.
- variable magnification optical system includes, in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power. And a fourth lens group having a positive refractive power, and the distance between the first lens group and the second lens group changes during zooming, and the second lens It is preferable that the distance between the third lens group and the third lens group changes, the distance between the third lens group and the fourth lens group changes, and the following conditional expression (3) is satisfied. (3) 1.7 ⁇ f4 / f3 ⁇ 2.4 However, f4: focal length of the fourth lens group (positive lens group) f3: focal length of the third lens group (focusing group)
- Conditional expression (3) is a conditional expression for defining a ratio between the focal length of the fourth lens group (positive lens group) and the focal length of the third lens group (focusing group).
- conditional expression (3) If the corresponding value of conditional expression (3) exceeds the upper limit, the refractive power of the third lens group becomes stronger, and various aberrations such as spherical aberration when focusing from an object at infinity to a near object are corrected. Difficult to do.
- conditional expression (3) when the corresponding value of the conditional expression (3) is below the lower limit value, the refractive power of the fourth lens group becomes strong, and it becomes difficult to correct various aberrations including coma.
- variable magnification optical system includes, in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power.
- a third lens group having a distance between the first lens group and the second lens group during zooming from the wide-angle end state to the telephoto end state. It is preferable that the distance from the third lens group can be reduced. With such a configuration, a zoom ratio of about 4 times or more can be secured.
- the front group preferably has a cemented lens. With such a configuration, spherical aberration and chromatic aberration can be effectively corrected.
- the front group includes a cemented lens
- the cemented lens includes a lens component having a positive refractive power and a lens component having a negative refractive power, and satisfies the following conditional expression (4): It is preferably possible to do this. (4) 0.70 ⁇ n1 / n2 ⁇ 0.95
- n1 Refractive index of the lens component having positive refractive power
- n2 Refractive index of the lens component having negative refractive power
- Conditional expression (4) defines the ratio of the refractive indices of the lens component having positive refractive power and the lens component having negative refractive power that constitute the cemented lens of the front group of the fourth lens group. This is a conditional expression. By satisfying conditional expression (4), spherical aberration can be corrected well.
- conditional expression (4) When the corresponding value of the conditional expression (4) exceeds the upper limit value, the concave refractive power at the joint surface between the lens component having a positive refractive power and the lens component having a negative refractive power becomes weak, and the spherical aberration is corrected. It becomes difficult.
- conditional expression (4) when the corresponding value of conditional expression (4) is below the lower limit, the concave refractive power at the cemented surface between the lens component having positive refractive power and the lens component having negative refractive power becomes strong, and spherical aberration is reduced. The correction becomes excessive.
- the front group includes a cemented lens
- the cemented lens includes a lens component having a positive refractive power and a lens component having a negative refractive power, and satisfies the following conditional expression (5): It is preferably possible to do this. (5) 1.7 ⁇ 1 / ⁇ 2 ⁇ 3.2
- ⁇ 1 Abbe number of the lens component having positive refractive power
- ⁇ 2 Abbe number of the lens component having negative refractive power
- Conditional expression (5) defines the ratio of the Abbe numbers of the lens component having a positive refractive power and the lens component having a negative refractive power constituting the cemented lens of the front group of the fourth lens group. This is a conditional expression. By satisfying conditional expression (5), chromatic aberration can be corrected satisfactorily.
- conditional expression (5) When the corresponding value of the conditional expression (5) exceeds the upper limit value, the Abbe number of the lens component having negative refractive power becomes small, and the correction of chromatic aberration becomes excessive. In order to secure the effect, it is preferable to set the upper limit of conditional expression (5) to 3.0. In order to further secure the effect, it is preferable to set the upper limit value of conditional expression (5) to 2.9.
- conditional expression (5) if the corresponding value of the conditional expression (5) is below the lower limit value, the Abbe number of the lens component having negative refractive power increases, and it becomes difficult to correct chromatic aberration.
- variable magnification optical system includes, in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power. And a fourth lens group having a positive refractive power, and the distance between the first lens group and the second lens group changes during zooming, and the second lens It is preferable that the distance between the third lens group and the third lens group is changed, and the distance between the third lens group and the fourth lens group is changed to satisfy the following conditional expression (6).
- (6) 0.5 ⁇ L4a / L4 ⁇ 0.9
- L4a distance of the largest air gap in the fourth lens group
- L4 distance from the most object side surface to the most image side surface of the fourth lens group
- Conditional expression (6) is a conditional expression for defining the ratio between the distance of the largest air gap in the fourth lens group and the total thickness of the fourth lens group.
- conditional expression (6) If the corresponding value of conditional expression (6) exceeds the upper limit value, the enlargement of the variable-magnification optical system will be caused, and the lens barrel will be enlarged accordingly. Furthermore, it becomes difficult to correct spherical aberration. In order to secure the effect, it is preferable to set the upper limit of conditional expression (6) to 0.86. In order to further secure the effect, it is preferable to set the upper limit value of conditional expression (6) to 0.82.
- conditional expression (6) when the corresponding value of conditional expression (6) is below the lower limit, it becomes difficult to correct various aberrations including coma. In order to secure the effect, it is preferable to set the lower limit of conditional expression (6) to 0.55. In order to further secure the effect, it is preferable to set the lower limit value of conditional expression (6) to 0.60.
- the optical device includes the variable magnification optical system having the above-described configuration.
- the focusing group focusing lens group
- the focusing lens group is reduced in weight, and an optical device with high quietness during autofocusing can be realized.
- a method for 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.
- a variable magnification optical system having a focusing group disposed between the first lens group and the first lens group. The distance between the negative lens group is changed, and the distance between the negative lens group and the positive lens group is changed, and at the time of focusing, the focus group and the focus group are opposed to the object side.
- the focusing group is composed of one lens component
- the positive lens group includes a front group having a positive refractive power and a negative refractive power.
- the distance between the front group and the rear group is the largest air distance in the positive lens group, and the rear group is composed of two lens components.
- a method of manufacturing a variable magnification optical system includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive lens in order from the object side along the optical axis.
- the four lens group includes a front group having a positive refractive power and a rear group having a negative refractive power, and the distance between the front group and the rear group is the largest in the air space in the fourth lens group.
- the rear group is composed of two lens components, and the distance between the first lens group and the second lens group changes during zooming, and the second lens group The distance between the third lens group changes and the distance between the third lens group and the fourth lens group changes. Configured to so that, when from infinity focusing to a close object, in which the third lens group is configured to move.
- variable magnification optical system reduce the weight of the focusing group and can manufacture a variable magnification optical system with high quietness during autofocus.
- FIG. 1 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the first example.
- the variable magnification optical system according to this example includes a first lens group G1 having a positive refractive power and a second lens having a negative refractive power in order from the object side along the optical axis. It includes a group G2, 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 along the optical axis, a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface on the object side, and a positive meniscus lens L13 having a convex surface on the object side. This is a positive lens.
- the second lens group G2 has, in order from the object side along the optical axis, a cemented negative lens of a biconcave negative lens L21 and a positive meniscus lens L22 having a convex surface on the object side, and a concave surface on the object side. It consists of a negative meniscus 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 along the optical axis, a front group G4F having a positive refractive power, an aperture stop S, and a rear group G4R.
- the front group G4F includes, in order from the object side along the optical axis, a cemented positive lens of a biconvex positive lens L41 and a biconcave negative lens L42, and a biconvex positive lens L43.
- the rear group G4R includes, in order from the object side along the optical axis, a cemented positive lens of a negative meniscus lens L44 having a convex surface facing the object side and a positive lens L45 having a biconvex shape, and a negative meniscus having a concave surface facing the object side.
- Lens L46
- an image sensor (not shown) composed of a CCD, a CMOS, or the like is disposed on the image plane I.
- the zoom optical system increases the distance between the first lens group G1 and the second lens group G2 when zooming from the wide-angle end state to the telephoto end state.
- the first lens group G1 and the second lens group G2 are arranged so that the distance between the second lens group G2 and the third lens group G3 decreases and the distance between the third lens group G3 and the fourth lens group G4 increases.
- the third lens group G3 and the fourth lens group G4 move along the optical axis with respect to the image plane I. Specifically, the first lens group moves toward the object side, the second lens group moves once toward the image side, then moves toward the object side, the third lens group G3 moves toward the object side, and the fourth lens group G4. Moves to the object side.
- the aperture stop S moves together with the fourth lens group G4 during zooming from the wide-angle end state to the telephoto end state.
- focusing from an object at infinity to a near object is performed by moving the third lens group G3 to the image plane side.
- Table 1 below lists values of specifications of the variable magnification optical system according to the present example.
- f indicates the focal length
- BF indicates the back focus (the distance on the optical axis between the lens surface closest to the image side and the image plane I).
- the surface number is the order of the optical surfaces counted from the object side
- r is the radius of curvature
- d is the surface spacing (the space between the nth surface (n is an integer) and the (n + 1) th surface)
- nd is The refractive index for d-line (wavelength 587.6 nm) and ⁇ d indicate the Abbe number for d-line (wavelength 587.6 nm), respectively.
- the object plane indicates the object plane
- the variable indicates the variable plane spacing
- the stop S indicates the aperture stop S
- the image plane indicates the image plane I.
- the radius of curvature r ⁇ indicates a plane.
- the description of the refractive index of air nd 1.00000 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 (image from the first surface when focusing on an object at infinity)
- the distance on the optical axis to the surface I) and dn (n is an integer) indicate variable surface intervals 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] shows the corresponding value of each conditional expression of the variable magnification optical system according to the present example.
- the focal length f, the radius of curvature r, and other length units listed in Table 1 are generally “mm”.
- the optical system is not limited to this because an equivalent optical performance can be obtained even when proportionally enlarged or proportionally reduced.
- symbol of Table 1 described above shall be similarly used also in the table
- FIGS. 3A and 3B are graphs showing various aberrations of the variable magnification optical system according to the first example when an object at infinity is focused.
- FIG. 2A shows a wide-angle end state
- FIG. 2B shows an intermediate focal length state
- FIG. Indicates the telephoto end state.
- FIGS. 3A and 3B are graphs showing various aberrations of the zoom optical system according to the first example when focusing on a short distance object.
- FIG. 3A shows a wide-angle end state
- FIG. 3B shows an intermediate focal length state
- FIG. Indicates the telephoto end state.
- FNO indicates an F number
- NA indicates a numerical aperture
- Y indicates an image height
- those not described are d-line
- the aberration curve at is shown.
- the spherical aberration diagram shows the F-number or numerical aperture corresponding to the maximum aperture
- the astigmatism diagram and the distortion diagram show the maximum image height
- the coma diagram shows the value of each image height. .
- the solid line indicates the sagittal image plane
- the broken line indicates the meridional image plane.
- variable magnification optical system according to the first example has excellent imaging performance with various aberrations corrected well from the wide-angle end state to the telephoto end state, Furthermore, it can be seen that the imaging performance is excellent even when focusing on a short-distance object.
- FIG. 4 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the second example.
- the variable magnification optical system according to this example includes a first lens group G1 having a positive refractive power and a second lens having a negative refractive power in order from the object side along the optical axis. It includes a group G2, 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 along the optical axis, a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface on the object side, and a positive meniscus lens L13 having a convex surface on the object side. This is a positive lens.
- the second lens group G2 includes, in order from the object side along the optical axis, 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. It consists of.
- 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 along the optical axis, a front group G4F having a positive refractive power, an aperture stop S, and a rear group G4R.
- the front group G4F includes, in order from the object side along the optical axis, a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side, and a positive meniscus having a convex surface facing the object side.
- Lens L43 is a cemented positive lens of a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side
- a positive meniscus having a convex surface facing the object side.
- the rear group G4R includes, in order from the object side along the optical axis, a cemented positive lens of a negative meniscus lens L44 having a convex surface facing the object side and a positive lens L45 having a biconvex shape, and a negative meniscus having a concave surface facing the object side.
- Lens L46
- an image sensor (not shown) composed of a CCD, a CMOS, or the like is disposed on the image plane I.
- the zoom optical system increases the distance between the first lens group G1 and the second lens group G2 when zooming from the wide-angle end state to the telephoto end state.
- the first lens group G1 and the second lens group G2 are arranged so that the distance between the second lens group G2 and the third lens group G3 decreases and the distance between the third lens group G3 and the fourth lens group G4 increases.
- the third lens group G3 and the fourth lens group G4 move along the optical axis with respect to the image plane I. Specifically, the first lens group moves toward the object side, the second lens group moves once toward the image side, then moves toward the object side, the third lens group G3 moves toward the object side, and the fourth lens group G4. Moves to the object side.
- the aperture stop S moves together with the fourth lens group G4 during zooming from the wide-angle end state to the telephoto end state.
- focusing from an object at infinity to a near object is performed by moving the third lens group G3 to the image plane side.
- Table 2 below lists values of specifications of the variable magnification optical system according to the present example.
- FIG. 5A and 5B are graphs showing various aberrations when the variable magnification optical system according to Example 2 is focused on an object at infinity.
- FIG. 5A shows a wide-angle end state
- FIG. 5B shows an intermediate focal length state
- 6A and 6B are graphs showing various aberrations of the zoom optical system according to the second example when focusing on a short distance object.
- FIG. 6A shows a wide-angle end state
- FIG. 6B shows an intermediate focal length state
- variable magnification optical system according to the second example has excellent imaging performance with various aberrations corrected well from the wide-angle end state to the telephoto end state. Furthermore, it can be seen that the imaging performance is excellent even when focusing on a short-distance object.
- FIG. 7 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the third example.
- the variable magnification optical system according to this example includes a first lens group G1 having a positive refractive power and a second lens having a negative refractive power in order from the object side along the optical axis. It includes a group G2, 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 along the optical axis, a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface on the object side, and a positive meniscus lens L13 having a convex surface on the object side. This is a positive lens.
- the second lens group G2 includes, in order from the object side along the optical axis, 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. It consists of.
- 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 along the optical axis, a front group G4F having a positive refractive power, an aperture stop S, and a rear group G4R.
- the front group G4F includes, in order from the object side along the optical axis, a cemented positive lens including a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
- the rear group G4R includes, in order from the object side along the optical axis, a biconvex positive lens L43 and a biconcave negative lens L44.
- an image sensor (not shown) composed of a CCD, a CMOS, or the like is disposed on the image plane I.
- the zoom optical system increases the distance between the first lens group G1 and the second lens group G2 when zooming from the wide-angle end state to the telephoto end state.
- the first lens group G1 and the second lens group G2 are arranged so that the distance between the second lens group G2 and the third lens group G3 decreases and the distance between the third lens group G3 and the fourth lens group G4 increases.
- the third lens group G3 and the fourth lens group G4 move along the optical axis with respect to the image plane I. Specifically, the first lens group moves toward the object side, the second lens group moves once toward the image side, then moves toward the object side, the third lens group G3 moves toward the object side, and the fourth lens group G4. Moves to the object side.
- the aperture stop S moves together with the fourth lens group G4 during zooming from the wide-angle end state to the telephoto end state.
- focusing from an object at infinity to a near object is performed by moving the third lens group G3 to the image plane side.
- Table 3 below lists values of specifications of the variable magnification optical system according to the present example.
- FIG. 8A and 8B are graphs showing various aberrations of the variable magnification optical system according to Example 3 when focusing on an object at infinity.
- FIG. 8A shows a wide-angle end state
- FIG. 8B shows an intermediate focal length state
- 9A and 9B are graphs showing various aberrations of the zoom optical system according to the third example when focusing on a short-distance object.
- FIG. 9A shows a wide-angle end state
- FIG. 9B shows an intermediate focal length state
- variable magnification optical system according to the third example has excellent imaging performance with various aberrations corrected well from the wide-angle end state to the telephoto end state. Furthermore, it can be seen that the imaging performance is excellent even when focusing on a short-distance object.
- FIG. 10 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the fourth example.
- the variable magnification optical system according to this example includes a first lens group G1 having a positive refractive power and a second lens having a negative refractive power in order from the object side along the optical axis. It includes a group G2, 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 along the optical axis, a biconvex positive lens L11, a negative meniscus lens L12 having a convex surface on the object side, and a positive meniscus lens L13 having a convex surface on the object side. This is a positive lens.
- the second lens group G2 includes, in order from the object side along the optical axis, 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. It consists of.
- 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 along the optical axis, a front group G4F having a positive refractive power, an aperture stop S, and a rear group G4R.
- the front group G4F includes, in order from the object side along the optical axis, a cemented positive lens including a biconvex positive lens L41 and a negative meniscus lens L42 having a concave surface facing the object side.
- the rear group G4R includes, in order from the object side along the optical axis, a biconvex positive lens L43 and a biconcave negative lens L44.
- an image sensor (not shown) composed of a CCD, a CMOS, or the like is disposed on the image plane I.
- the zoom optical system increases the distance between the first lens group G1 and the second lens group G2 when zooming from the wide-angle end state to the telephoto end state.
- the first lens group G1 and the second lens group G2 are arranged so that the distance between the second lens group G2 and the third lens group G3 decreases and the distance between the third lens group G3 and the fourth lens group G4 increases.
- the third lens group G3 and the fourth lens group G4 move along the optical axis with respect to the image plane I. Specifically, the first lens group moves toward the object side, the second lens group moves once toward the image side, then moves toward the object side, the third lens group G3 moves toward the object side, and the fourth lens group G4. Moves to the object side.
- the aperture stop S moves together with the fourth lens group G4 during zooming from the wide-angle end state to the telephoto end state.
- focusing from an object at infinity to a near object is performed by moving the third lens group G3 to the image plane side.
- Table 4 below lists values of specifications of the variable magnification optical system according to the present example.
- FIG. 11A and 11B are graphs showing various aberrations of the variable magnification optical system according to Example 4 when focusing on an object at infinity.
- FIG. 11A shows a wide-angle end state
- FIG. 11B shows an intermediate focal length state
- 12A and 12B are graphs showing various aberrations of the zoom optical system according to the fourth example when focusing on a short-distance object.
- FIG. 12A shows a wide-angle end state
- FIG. 12B shows an intermediate focal length state
- variable magnification optical system according to the fourth example has excellent imaging performance with various aberrations corrected well from the wide-angle end state to the telephoto end state, Furthermore, it can be seen that the imaging performance is excellent even when focusing on a short-distance object.
- the focusing group (focusing lens group) can be sufficiently reduced in weight.
- the focusing group can be reduced in weight, a large motor or actuator for moving the focusing group at high speed is not necessary, and autofocusing can be speeded up without increasing the size of the lens barrel.
- a variable power optical system with high optical performance that satisfactorily suppresses aberration fluctuations during zooming from the wide-angle end state to the telephoto end state and aberration fluctuations during focusing from an object at infinity to a close object.
- each said Example has shown a specific example, and this embodiment is not limited to these. The following contents can be appropriately adopted as long as the optical performance of the variable magnification optical system is not impaired.
- variable magnification optical system Although a four-group configuration is shown as a numerical example of the variable magnification optical system, the present embodiment is not limited to this, and a variable magnification optical system of another group configuration (for example, five groups, six groups, etc.) is configured. You can also. Specifically, a configuration in which a lens or a lens group is added on the most object side or the most image side of the zoom optical system may be used.
- the lens group refers to a portion having at least one lens separated by an air interval that changes during zooming.
- the third lens group G3 that is a focusing group is configured by a single lens, but the third lens group G3 may be configured by a cemented lens. Good.
- the focusing group (focusing lens group) is also suitable for driving by an autofocus motor, for example, an ultrasonic motor.
- the lens surface of the lens constituting the variable magnification optical system may be a spherical surface, a flat surface, or an aspherical surface.
- the lens surface is a spherical surface or a flat surface, lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, there is little deterioration in drawing performance.
- the lens surface is aspherical, any of aspherical surface by grinding, glass mold aspherical surface in which glass is molded into an aspherical shape, or composite aspherical surface in which resin provided on the glass surface is formed in an aspherical shape Good.
- the lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.
- GRIN lens gradient index lens
- the aperture stop is disposed in the fourth lens group, but may be disposed on the most object side of the fourth lens group. Moreover, it is good also as a structure which substitutes the role with a lens frame, without providing a member as an aperture stop.
- an antireflection film having a high transmittance in a wide wavelength range may be provided on the lens surface of the lens constituting the variable magnification optical system.
- FIG. 13 is a diagram illustrating a configuration of an example of a camera including a variable magnification optical system.
- the camera 1 is a digital single-lens reflex camera provided with the variable magnification optical system according to the first example as the photographing lens 2.
- the digital single-lens reflex camera 1 shown in FIG. 13 light from an object (subject) (not shown) is collected by the photographing lens 2 and imaged on the focusing plate 5 via the quick return mirror 3.
- the light imaged on the collecting plate 5 is reflected a plurality of times in the pentaprism 7 and guided to the eyepiece lens 9.
- the photographer can observe the object (subject) image as an erect image through the eyepiece 9.
- the quick return mirror 3 is retracted out of the optical path, and the light of the object (subject) collected by the photographing lens 2 forms a subject image on the image sensor 11. Thereby, the light from the object is picked up by the image pickup device 11 and stored in a memory (not shown) as an object image. In this way, the photographer can photograph an object with the camera 1.
- variable magnification optical system according to the first example mounted on the camera 1 as the photographing lens 2 is a variable magnification optical system in which the focusing group (focusing lens group) is sufficiently lightened. Therefore, the camera 1 is a camera with high silence during autofocus. In addition, since the camera 1 can reduce the weight of the focusing group, it is possible to increase the speed of autofocus without increasing the size of the lens barrel. Further, the camera 1 can realize high optical performance that satisfactorily suppresses the aberration fluctuation at the time of zooming from the wide-angle end state to the telephoto end state and the aberration fluctuation at the time of focusing from an object at infinity to a short distance object. it can.
- the camera 1 may hold
- FIG. The camera 1 may be a camera that does not have a quick return mirror or the like.
- 14 and 15 are diagrams showing an outline of an example of a manufacturing method of the variable magnification optical system.
- variable magnification optical system manufacturing method includes a first lens group having a positive refractive power disposed closest to the object side, and a negative refraction disposed closer to the image side than the first lens group.
- a positive lens group having a positive refractive power including a negative lens group having a force, and at least one lens disposed on the image side of the negative lens group and moving integrally with the stop;
- a variable magnification optical system manufacturing method having a focusing group disposed between the negative lens group and the positive lens group, and includes the following steps SA to SD.
- Step SA The focusing group is composed of one lens component.
- Step SB The positive lens group is composed of a front group having a positive refractive power and a rear group having a negative refractive power, and the air between the front group and the rear group is the largest air space in the positive lens group.
- the rear group is composed of two lens components.
- Step SC During zooming, the first lens group moves relative to the image plane, the distance between the first lens group and the negative lens group changes, and the distance between the negative lens group and the positive lens group changes. Arrange to change.
- Step SD At the time of focusing, the distance between the focusing group and the lens disposed at the position facing the object side of the focusing group is changed, and the focusing group and the focusing group are opposed to the image side. It arrange
- the optical system manufacturing method includes, in order from the object side along the optical axis, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive
- FIG. 14 shows a manufacturing method of a variable magnification optical system having a third lens group having a refractive power and a fourth lens group having a positive refractive power, and includes the following steps S1 to S4 as shown in FIG. It is a waste.
- Step S2 The fourth lens group is composed of a front group having a positive refractive power and a rear group having a negative refractive power, and the distance between the front group and the rear group is the largest air space in the fourth lens group.
- the rear air group is composed of two lens components.
- Step S3 During zooming, the distance between the first lens group and the second lens group changes, the distance between the second lens group and the third lens group changes, and the third lens group and the fourth lens group The interval is changed.
- Step S4 The third lens group is configured to move when focusing from an object at infinity to an object at a short distance.
- variable magnification optical system it is possible to manufacture a variable magnification optical system in which the focusing group (focusing lens group) is sufficiently lightened. As a result, it is possible to realize a variable magnification optical system with high quietness during autofocus. In addition, since the focusing group can be reduced in weight, it is possible to increase the speed of autofocus without increasing the size of the lens barrel. Furthermore, a variable power optical system with high optical performance that satisfactorily suppresses aberration fluctuations during zooming from the wide-angle end state to the telephoto end state and aberration fluctuations during focusing from an object at infinity to a close object. Can be realized.
- G1 First lens group G2 Second lens group (negative lens group) G3 Third lens group (focusing group) G4 4th lens group (positive lens group) G4F Front group G4R Rear group S Aperture stop I Image plane 1 Optical device 2 Fishing lens 3 Quick return mirror 5 Focusing plate 7 Penta prism 9 Eyepiece 11 Image sensor.
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Abstract
Description
本願は、2014年12月26日に出願された日本国特許出願2014-266038号に基づき優先権を主張し、その内容をここに援用する。
前記負レンズ群と前記正レンズ群との間に配置された合焦群と、を有する変倍光学系の製造方法であって、変倍に際し、前記第1レンズ群が像面に対して移動し、前記第1レンズ群と前記負レンズ群の間隔が変化し、前記負レンズ群と前記正レンズ群の間隔が変化するように配置し、合焦に際し、前記合焦群と前記合焦群の物体側に対向する位置に配置されたレンズとの間隔が変化し、前記合焦群と前記合焦群の像側に対向する位置に配置されたレンズとの間隔が変化するように配置し、前記合焦群は一つのレンズ成分で構成し、前記正レンズ群は、正の屈折力を有する前群と負の屈折力を有する後群とからなり、前記前群と前記後群との間隔は前記正レンズ群内の空気間隔で最も大きな空気間隔であり、前記後群は、二つのレンズ成分からなる。
この構成により、変倍を実現し、変倍時の良好な収差補正を図ることができる。
(1)0.4 < fF/(-fR) < 0.9
ただし、
fF:前記前群の焦点距離
fR:前記後群の焦点距離
(2)3.5 < f1/(-f2) < 6.5
ただし、
f1:前記第1レンズ群の焦点距離
f2:前記第2レンズ群(負レンズ群)の焦点距離
(3)1.7 < f4/f3 < 2.4
ただし、
f4:前記第4レンズ群(正レンズ群)の焦点距離
f3:前記第3レンズ群(合焦群)の焦点距離
(4)0.70 < n1/n2 < 0.95
ただし、
n1:前記正の屈折力を有するレンズ成分の屈折率
n2:前記負の屈折力を有するレンズ成分の屈折率
(5)1.7 < ν1/ν2 < 3.2
ただし、
ν1:前記正の屈折力を有するレンズ成分のアッベ数
ν2:前記負の屈折力を有するレンズ成分のアッベ数
(6)0.5 < L4a/L4 < 0.9
ただし、
L4a:前記第4レンズ群内の前記最も大きな空気間隔の距離
L4:前記第4レンズ群の最も物体側の面から最も像側の面までの距離
以下、数値実施例に係る変倍光学系を添付図面に基づいて説明する。
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断面図である。
図1に示すように、本実施例に係る変倍光学系は、光軸に沿って物体側から順に、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。
前群G4Fは、光軸に沿って物体側から順に、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。
後群G4Rは、光軸に沿って物体側から順に、物体側に凸面を向けた負メニスカスレンズL44と両凸形状の正レンズL45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L46とからなる。
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=1.000000の記載は省略している。
[条件式対応値]には、本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) 76.4258 6.548 1.51680 63.88
2) -464.2314 0.358
3) 90.4822 1.500 1.62004 36.40
4) 33.2495 8.383 1.51680 63.88
5) 160.8334 (可変)
6) -316.0803 1.032 1.69680 55.52
7) 18.6751 3.799 1.80518 25.45
8) 40.0554 3.549
9) -33.1981 1.000 1.69680 55.52
10) -1117.3765 (可変)
11) 80.6415 4.186 1.51680 63.88
12) -52.0308 (可変)
13) 59.4932 5.360 1.48749 70.31
14) -32.1755 1.000 1.85026 32.35
15) 2430.7009 0.200
16) 36.9252 4.137 1.48749 70.31
17) -180.2758 1.591
18) (絞り) ∞ 33.593
19) 103.7551 1.000 1.80610 40.97
20) 20.5037 3.557 1.72825 28.38
21) -170.9425 2.800
22) -23.0279 1.000 1.77250 49.62
23) -56.4025 (BF)
像面 ∞
[各種データ]
変倍比 4.12
W M T
f 71.4 105.0 294.0
FNO 4.13 4.13 6.39
2ω 22.78 15.24 5.48
Ymax 14.25 14.25 14.25
TL 166.24 183.88 219.32
BF 38.52 38.52 73.98
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 4.336 25.853 44.310 4.336 25.853 44.310
d10 25.705 20.825 2.000 26.431 21.891 3.062
d12 13.089 14.088 14.437 12.363 13.022 13.375
[レンズ群データ]
群 始面 f
G1 1 115.617
G2 6 -26.471
G3 11 61.860
G4 13 122.679
[各条件式対応値]
(1)fF/(-fR) = 0.832
(2)f1/(-f2) = 4.368
(3)f4/f3 = 1.983
(4)n1/n2 = 0.804
(5)ν1/ν2 = 2.173
(6)L4a/L4 = 0.649
図3は、第1実施例に係る変倍光学系の近距離物体合焦時の諸収差図であり、(a)は広角端状態を、(b)は中間焦点距離状態を、(c)は望遠端状態をそれぞれ示している。
図4は、第2実施例に係る変倍光学系のレンズ構成を示す断面図である。
図4に示すように、本実施例に係る変倍光学系は、光軸に沿って物体側から順に、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。
前群G4Fは、光軸に沿って物体側から順に、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との接合正レンズと、物体側に凸面を向けた正メニスカスレンズL43とからなる。
後群G4Rは、光軸に沿って物体側から順に、物体側に凸面を向けた負メニスカスレンズL44と両凸形状の正レンズL45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L46とからなる。
[面データ]
面番号 r d nd νd
物面 ∞
1) 86.5140 5.500 1.51680 63.88
2) -590.6740 0.642
3) 118.2660 1.500 1.62004 36.40
4) 37.8433 8.000 1.51680 63.88
5) 464.3230 (可変)
6) -180.0300 1.000 1.69680 55.52
7) 18.7396 3.789 1.80518 25.45
8) 47.3058 2.843
9) -40.0856 1.000 1.77250 49.62
10) 426.1263 (可変)
11) 80.5313 3.897 1.51680 63.88
12) -54.0834 (可変)
13) 77.9117 4.895 1.48749 70.31
14) -30.8533 1.000 1.72825 28.38
15) -280.6767 0.200
16) 35.5006 3.290 1.48749 70.31
17) 199.3937 2.336
18) (絞り) ∞ 34.528
19) 115.8527 1.000 1.77250 49.62
20) 18.2444 5.000 1.67270 32.19
21) -110.1987 4.000
22) -24.6132 1.000 1.80610 40.97
23) -57.1535 (BF)
像面 ∞
[各種データ]
変倍比 4.12
W M T
f 71.4 105.0 294.0
FNO 4.53 4.54 6.34
2ω 22.68 15.20 5.44
Ymax 14.25 14.25 14.25
TL 166.32 187.07 219.32
BF 38.51 38.71 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 27.049 51.658 3.000 27.049 51.658
d10 25.565 21.031 2.000 26.211 21.973 3.224
d12 13.818 14.860 15.725 13.172 13.917 14.501
[レンズ群データ]
群 始面 f
G1 1 120.601
G2 6 -26.990
G3 11 63.229
G4 13 117.957
[各条件式対応値]
(1)fF/(-fR) = 0.854
(2)f1/(-f2) = 4.468
(3)f4/f3 = 1.866
(4)n1/n2 = 0.861
(5)ν1/ν2 = 2.477
(6)L4a/L4 = 0.644
図6は、第2実施例に係る変倍光学系の近距離物体合焦時の諸収差図であり、(a)は広角端状態を、(b)は中間焦点距離状態を、(c)は望遠端状態をそれぞれ示している。
図7は、第3実施例に係る変倍光学系のレンズ構成を示す断面図である。
図7に示すように、本実施例に係る変倍光学系は、光軸に沿って物体側から順に、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。
前群G4Fは、光軸に沿って物体側から順に、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。
後群G4Rは、光軸に沿って物体側から順に、両凸形状の正レンズL43と、両凹形状の負レンズL44とからなる。
[面データ]
面番号 r d nd νd
物面 ∞
1) 79.181 5.916 1.51680 63.88
2) -865.935 0.515
3) 123.870 1.500 1.62004 36.40
4) 37.628 8.227 1.51680 63.88
5) 402.325 (可変)
6) -104.719 1.000 1.69680 55.52
7) 19.124 4.140 1.80518 25.45
8) 65.634 2.236
9) -50.951 1.000 1.80610 40.97
10) 160.536 (可変)
11) 102.843 3.727 1.51680 63.88
12) -48.859 (可変)
13) 38.795 5.043 1.48749 70.31
14) -39.042 1.000 1.80518 25.45
15) -165.709 1.620
16) (絞り) ∞ 46.334
17) 103.400 3.400 1.67270 32.19
18) -36.557 1.727
19) -27.830 1.000 1.77250 49.62
20) 154.941 (BF)
像面 ∞
[各種データ]
変倍比 4.12
W M T
f 71.4 105.0 294.0
FNO 4.71 4.72 6.40
2ω 22.78 15.28 5.44
Ymax 14.25 14.25 14.25
TL 167.33 188.29 221.32
BF 38.51 38.72 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 3.117 26.926 51.633 3.117 26.626 51.633
d10 28.867 23.778 2.000 29.628 24.882 3.428
d12 8.442 10.483 14.781 7.681 9.378 13.353
[レンズ群データ]
群 始面 f
G1 1 122.444
G2 6 -28.587
G3 11 64.633
G4 13 141.232
[各条件式対応値]
(1)fF/(-fR) = 0.665
(2)f1/(-f2) = 4.283
(3)f4/f3 = 2.185
(4)n1/n2 = 0.824
(5)ν1/ν2 = 2.763
(6)L4a/L4 = 0.798
図9は、第3実施例に係る変倍光学系の近距離物体合焦時の諸収差図であり、(a)は広角端状態を、(b)は中間焦点距離状態を、(c)は望遠端状態をそれぞれ示している。
図10は、第4実施例に係る変倍光学系のレンズ構成を示す断面図である。
図10に示すように、本実施例に係る変倍光学系は、光軸に沿って物体側から順に、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。
前群G4Fは、光軸に沿って物体側から順に、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。
後群G4Rは、光軸に沿って物体側から順に、両凸形状の正レンズL43と、両凹形状の負レンズL44とからなる。
[面データ]
面番号 r d nd νd
物面 ∞
1) 88.000 5.386 1.51680 63.88
2) -470.597 0.200
3) 116.000 1.500 1.62004 36.40
4) 38.400 7.368 1.51680 63.88
5) 262.431 (可変)
6) -115.000 1.000 1.69680 55.52
7) 18.736 4.257 1.80518 25.45
8) 75.513 2.005
9) -53.736 1.000 1.80100 34.92
10) 122.000 (可変)
11) 92.248 3.551 1.51680 63.88
12) -55.188 (可変)
13) 37.517 5.015 1.49700 81.73
14) -37.517 1.000 1.72825 28.38
15) -271.936 4.500
16) (絞り) ∞ 40.717
17) 110.794 3.336 1.68893 31.16
18) -32.526 1.096
19) -25.909 1.000 1.77250 49.62
20) 130.000 (BF)
像面 ∞
[各種データ]
変倍比 4.24
W M T
f 69.3 104.5 294.0
FNO 4.69 4.75 6.46
2ω 23.44 15.28 5.44
Ymax 14.25 14.25 14.25
TL 166.54 189.91 221.32
BF 38.53 39.04 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 3.600 29.972 55.757 3.600 29.972 55.757
d10 31.403 25.592 2.000 32.262 26.852 3.608
d12 10.077 12.375 16.114 9.218 11.115 14.506
[レンズ群データ]
群 始面 f
G1 1 128.797
G2 6 -30.221
G3 11 67.368
G4 13 143.638
[各条件式対応値]
(1)fF/(-fR) = 0.719
(2)f1/(-f2) = 4.262
(3)f4/f3 = 2.117
(4)n1/n2 = 0.866
(5)ν1/ν2 = 2.880
(6)L4a/L4 = 0.798
図12は、第4実施例に係る変倍光学系の近距離物体合焦時の諸収差図であり、(a)は広角端状態を、(b)は中間焦点距離状態を、(c)は望遠端状態をそれぞれ示している。
なお、上記各実施例は一具体例を示しているものであり、本実施形態はこれらに限定されるものではない。以下の内容は、変倍光学系の光学性能を損なわない範囲で適宜採用することが可能である。
図13は、変倍光学系を備えたカメラの一例の構成を示す図である。
図13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デジタル一眼レフカメラである。
図13に示すデジタル一眼レフカメラ1において、図示しない物体(被写体)からの光は、撮影レンズ2で集光されて、クイックリターンミラー3を介して集点板5に結像される。そして、集点板5に結像された光は、ペンタプリズム7中で複数回反射されて接眼レンズ9へと導かれる。これにより、撮影者は、物体(被写体)像を接眼レンズ9を介して正立像として観察することができる。
前記負レンズ群と前記正レンズ群との間に配置された合焦群と、を有する変倍光学系の製造方法であって、以下のステップSA~SDを含む。
ステップSA:合焦群を一つのレンズ成分で構成する。
ステップSB:正レンズ群を、正の屈折力を有する前群と負の屈折力を有する後群とから構成し、前群と後群との間隔を正レンズ群内の空気間隔で最も大きな空気間隔となるように構成し、後群を二つのレンズ成分で構成する。
ステップSC:変倍の際、前記第1レンズ群が像面に対して移動し、前記第1レンズ群と前記負レンズ群の間隔が変化し、前記負レンズ群と前記正レンズ群の間隔が変化するように配置する。
ステップSD:合焦の際、前記合焦群と前記合焦群の物体側に対向する位置に配置されたレンズとの間隔が変化し、前記合焦群と前記合焦群の像側に対向する位置に配置されたレンズとの間隔が変化するように配置する。
ステップS1:第3レンズ群を一つのレンズ成分で構成する。
ステップS2:第4レンズ群を、正の屈折力を有する前群と負の屈折力を有する後群とから構成し、前群と後群との間隔を第4レンズ群内の空気間隔で最も大きな空気間隔となるように構成し、後群を二つのレンズ成分で構成する。
ステップS3:変倍の際、第1レンズ群と第2レンズ群との間隔が変化し、第2レンズ群と第3レンズ群との間隔が変化し、第3レンズ群と第4レンズ群との間隔が変化するように構成する。
ステップS4:無限遠物体から近距離物体への合焦の際、第3レンズ群が移動するように構成する。
G2 第2レンズ群(負レンズ群)
G3 第3レンズ群(合焦群)
G4 第4レンズ群(正レンズ群)
G4F 前群
G4R 後群
S 開口絞り
I 像面
1 光学装置
2 撮影レンズ
3 クイックリターンミラー
5 集点板
7 ペンタプリズム
9 接眼レンズ
11 撮像素子。
Claims (14)
- 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負レンズ群と、
前記負レンズ群より像側に配置され、かつ、開口絞りと一体に動くレンズを少なくとも1つ含み、正の屈折力を有する正レンズ群と、
前記負レンズ群と前記正レンズ群との間に配置された合焦群と、を有し、
変倍の際、前記第1レンズ群が像面に対して移動し、前記第1レンズ群と前記負レンズ群の間隔が変化し、前記負レンズ群と前記正レンズ群の間隔が変化し、
合焦の際、前記合焦群と前記合焦群の物体側に対向する位置に配置されたレンズとの間隔が変化し、前記合焦群と前記合焦群の像側に対向する位置に配置されたレンズとの間隔が変化し、
前記合焦群は一つのレンズ成分で構成され、
前記正レンズ群は、正の屈折力を有する前群と負の屈折力を有する後群とからなり、前記前群と前記後群との間隔は前記正レンズ群内の空気間隔で最も大きな空気間隔であり、
前記後群は、二つのレンズ成分からなる変倍光学系。 - 光軸に沿って物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とを有し、
変倍の際、前記第1レンズ群と前記第2レンズ群との間隔が変化し、前記第2レンズ群と前記第3レンズ群との間隔が変化し、前記第3レンズ群と前記第4レンズ群との間隔が変化し、
無限遠物体から近距離物体への合焦の際、前記第3レンズ群が移動し、
前記第3レンズ群は一つのレンズ成分で構成され、
前記第4レンズ群は、正の屈折力を有する前群と負の屈折力を有する後群とからなり、前記前群と前記後群との間隔は前記第4レンズ群内の空気間隔で最も大きな空気間隔であり、
前記後群は、二つのレンズ成分で構成されている変倍光学系。 - 広角端状態から望遠端状態への変倍の際、前記第1レンズ群が物体側へ移動する請求項1または2に記載の変倍光学系。
- 光軸に沿って物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とを有し、
広角端状態から望遠端状態への変倍の際、前記第1レンズ群と前記第2レンズ群との間隔が変化し、前記第2レンズ群と前記第3レンズ群との間隔が変化し、前記第3レンズ群と前記第4レンズ群との間隔が増大する請求項1から3の何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4の何れか一項に記載の変倍光学系。
0.4 < fF/(-fR) < 0.9
ただし、
fF:前記前群の焦点距離
fR:前記後群の焦点距離 - 光軸に沿って物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群とを有し、
変倍の際、前記第1レンズ群と前記第2レンズ群との間隔が変化し、
以下の条件式を満足する請求項1から5の何れか一項に記載の変倍光学系。
3.5 < f1/(-f2) < 6.5
ただし、
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、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とを有し、
変倍の際、前記第1レンズ群と前記第2レンズ群との間隔が変化し、前記第2レンズ群と前記第3レンズ群との間隔が変化し、前記第3レンズ群と前記第4レンズ群との間隔が変化し、
以下の条件式を満足する請求項1から6の何れか一項に記載の変倍光学系。
1.7 < f4/f3 < 2.4
ただし、
f4:前記第4レンズ群の焦点距離
f3:前記第3レンズ群の焦点距離 - 光軸に沿って物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群とを有し、
広角端状態から望遠端状態への変倍の際、前記第1レンズ群と前記第2レンズ群との間隔が増大し、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から7の何れか一項に記載の変倍光学系。 - 前記前群は、接合レンズを有する請求項1から8の何れか一項に記載の変倍光学系。
- 前記前群は接合レンズを有し、前記接合レンズは正の屈折力を有するレンズ成分と負の屈折力を有するレンズ成分とからなり、以下の条件式を満足する請求項1から9の何れか一項に記載の変倍光学系。
0.70 < n1/n2 < 0.95
ただし、
n1:前記正の屈折力を有するレンズ成分の屈折率
n2:前記負の屈折力を有するレンズ成分の屈折率 - 前記前群は接合レンズを有し、前記接合レンズは正の屈折力を有するレンズ成分と負の屈折力を有するレンズ成分とからなり、以下の条件式を満足する請求項1から10の何れか一項に記載の変倍光学系。
1.7 < ν1/ν2 < 3.2
ただし、
ν1:前記正の屈折力を有するレンズ成分のアッベ数
ν2:前記負の屈折力を有するレンズ成分のアッベ数 - 光軸に沿って物体側から順に、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とを有し、
変倍の際、前記第1レンズ群と前記第2レンズ群との間隔が変化し、前記第2レンズ群と前記第3レンズ群との間隔が変化し、前記第3レンズ群と前記第4レンズ群との間隔が変化し、
以下の条件式を満足する請求項1から11の何れか一項に記載の変倍光学系。
0.5 < L4a/L4 < 0.9
ただし、
L4a:前記第4レンズ群内の前記最も大きな空気間隔の距離
L4:前記第4レンズ群の最も物体側の面から最も像側の面までの距離 - 請求項1から12の何れか一項に記載の変倍光学系を備えた光学装置。
- 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負レンズ群と、
前記負レンズ群より像側に配置され、かつ、絞りと一体に動くレンズを少なくとも1つ含み、正の屈折力を有する正レンズ群と、
前記負レンズ群と前記正レンズ群との間に配置された合焦群と、を有する変倍光学系の製造方法であって、
変倍に際し、前記第1レンズ群が像面に対して移動し、前記第1レンズ群と前記負レンズ群の間隔が変化し、前記負レンズ群と前記正レンズ群の間隔が変化するように配置し、
合焦に際し、前記合焦群と前記合焦群の物体側に対向する位置に配置されたレンズとの間隔が変化し、前記合焦群と前記合焦群の像側に対向する位置に配置されたレンズとの間隔が変化するように配置し、
前記合焦群は一つのレンズ成分で構成し、
前記正レンズ群は、正の屈折力を有する前群と負の屈折力を有する後群とからなり、前記前群と前記後群との間隔は前記正レンズ群内の空気間隔で最も大きな空気間隔であり、
前記後群は、二つのレンズ成分からなる変倍光学系の製造方法。
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JPWO2020178883A1 (ja) * | 2019-03-01 | 2021-09-30 | オリンパス株式会社 | 広角光学系及びそれを備えた撮像装置 |
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US20180052311A1 (en) | 2018-02-22 |
JPWO2016104771A1 (ja) | 2017-10-12 |
CN107209352A (zh) | 2017-09-26 |
JP6269861B2 (ja) | 2018-01-31 |
JP2018077514A (ja) | 2018-05-17 |
US11415786B2 (en) | 2022-08-16 |
US10698189B2 (en) | 2020-06-30 |
US20200363615A1 (en) | 2020-11-19 |
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