WO2016104785A1 - 変倍光学系、光学装置、変倍光学系の製造方法 - Google Patents
変倍光学系、光学装置、変倍光学系の製造方法 Download PDFInfo
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- WO2016104785A1 WO2016104785A1 PCT/JP2015/086407 JP2015086407W WO2016104785A1 WO 2016104785 A1 WO2016104785 A1 WO 2016104785A1 JP 2015086407 W JP2015086407 W JP 2015086407W WO 2016104785 A1 WO2016104785 A1 WO 2016104785A1
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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
- G02B15/16—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
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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, an optical apparatus, and a method for manufacturing the variable magnification optical system.
- This application claims priority based on the Japan patent application 2014-266036 for which it applied on December 26, 2014, and uses the content here.
- variable power optical system as described above has a problem that it cannot achieve good optical performance.
- 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.
- the distance from the lens disposed at the position facing the image side of the focusing group changes, and the focusing group is composed of one single lens having a positive refractive power, and satisfies the following conditional expression: . 1.40 ⁇ f1 / ff ⁇ 2.20
- f1 Focal length of the first lens group
- ff Focal length of the focusing group
- variable magnification optical system includes 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.
- 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 at the time of zooming.
- the focusing group is composed of a single lens having positive refractive power, and satisfies the following conditional expression: The variable magnification optical system. 1.40 ⁇ f1 / ff ⁇ 2.20 However, f1: Focal length of the first lens group ff: Focal length of the focusing group
- Another aspect of the present invention is: In order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power And having a group
- the third lens group comprises one single lens having positive refractive power
- a variable magnification optical system that satisfies the following conditional expression is provided. 1.40 ⁇ f1 / ff ⁇ 2.20
- f1 Focal length ff of the first lens group
- ff Focal length of the third lens group
- Another embodiment of the present invention is as follows.
- An optical apparatus having the zoom optical system is provided.
- 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 power optical system manufacturing method comprising: a negative lens group having a refractive power of 5; and a focusing group disposed between the negative lens group and an aperture stop. The distance between the negative lens group and the negative lens group is changed, and the distance between the negative lens group and the aperture is changed. When focusing, the focus group and the object side of the focus group are opposed to each other. The distance between the lens arranged at the position is changed, and the distance between the focusing group and the lens arranged at the position facing the image side of the focusing group is changed.
- the lens is composed of one single lens having a positive refractive power and satisfies the following conditional expression. 1.40 ⁇ f1 / ff ⁇ 2.20 However, f1: Focal length of the first lens group ff: Focal length of the focusing group
- Another embodiment of the present invention is as follows.
- a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens having a positive refractive power A variable magnification optical system having a group,
- the third lens group is composed of one single lens having a positive refractive power;
- the zoom optical system satisfies the following conditional expression, At the time of 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
- a method for manufacturing a variable magnification optical system in which the distance from a group is changed 1.40 ⁇ f1 / ff ⁇ 2.20
- f1 Focal length ff of the first lens group
- ff Focal length of the third lens group
- FIG. 1 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the first example.
- 2 (a), 2 (b) and 2 (c) are respectively when an 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.
- FIG. 3 (a), 3 (b) and 3 (c) are respectively 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 first example.
- FIG. FIG. 4 is a cross-sectional view showing the lens configuration of the variable magnification optical system according to the second example.
- FIG. 5 (a), 5 (b) and 5 (c) are respectively when an 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.
- FIG. 6 (a), 6 (b) and 6 (c) are respectively when a short distance object is focused 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. FIG. 7 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the third example.
- FIGS. 9A, 9B, and 9C are diagrams for focusing 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, respectively.
- FIG. FIG. 10 is a cross-sectional view showing a lens configuration of a variable magnification optical system according to the fourth example.
- FIG. 11 (a), 11 (b), and 11 (c), respectively, are focused 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 fourth example.
- FIG. 12 (a), 12 (b), and 12 (c), respectively, are those 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 fourth example.
- FIG. FIG. 13 is a diagram showing a configuration of an example of a camera provided with a variable magnification optical system.
- FIG. 14 is a diagram showing an outline of an example of a method for manufacturing a variable magnification optical system.
- FIG. 15 is a diagram showing an outline of an example of a manufacturing method of the variable magnification optical system.
- variable magnification optical system an optical apparatus, and a method for manufacturing 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. And a focusing group disposed between the negative lens group and the aperture stop, and the distance between the first lens group and the negative lens group changes during zooming, and the negative lens The distance between the group and the diaphragm changes.
- the distance between the focusing group and the lens arranged at the position facing the object side of the focusing group changes, and the position facing the focusing group and the image side of the focusing group
- the distance between the lens and the lens arranged on the lens changes, and the focusing group is composed of one single lens having a positive refractive power.
- 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 a group, an anti-vibration group movable so as to have at least a part of a component orthogonal to the optical axis, and a focusing group disposed between the negative lens group and the positive lens group
- 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.
- the distance between the focusing group and the lens arranged at the position facing the object side of the focusing group changes, and the position facing the focusing group and the image side of the focusing group
- the distance between the lens and the lens arranged on the lens changes, and the focusing group is composed of one single lens having a positive refractive power.
- the zoom optical system includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power.
- a lens group and a fourth lens group having a positive refractive power and at the time of zooming, an interval between the first lens group and the second lens group changes, and the second lens group and the third lens group The distance between the lens group changes, and the distance between the third lens group and the fourth lens group changes.
- the third lens group is composed of a single lens having positive refractive power. With this configuration, it is possible to satisfactorily correct aberration fluctuations during zooming while reducing the size of the lens barrel.
- variable magnification optical system satisfies the following conditional expression (1).
- (1) 1.40 ⁇ f1 / ff ⁇ 2.20
- f1 Focal length ff of the first lens group: Focal length of the focusing group (third lens group)
- Conditional expression (1) defines the ratio between the focal length of the first lens group and the focal length of the focusing group (focusing lens group, third lens group).
- variable magnification optical system when the corresponding value of the conditional expression (1) is less than the lower limit value, the refractive power of the first lens unit increases. This is not preferable because it becomes difficult to correct spherical aberration and longitudinal chromatic aberration in the telephoto end state.
- the lower limit value of conditional expression (1) In order to secure the effect, it is preferable that the lower limit value of conditional expression (1) is 1.45. In order to make the effect more reliable, it is preferable that the lower limit value of the conditional expression (1) is 1.48.
- the refractive power of the third lens group increases. This is not preferable because it becomes difficult to correct spherical aberration and coma in the telephoto end state.
- the upper limit value of conditional expression (1) is 2.00. In order to make the effect more reliable, it is preferable that the upper limit value of the conditional expression (1) is 1.93.
- variable magnification optical system with good optical performance can be realized.
- the aberration fluctuation is large when focusing on a short distance object.
- the conventional variable magnification optical system is configured to extend the first lens group having a large weight when focusing on a short-distance object, the load on the autofocus mechanism such as a motor is large.
- the variable magnification optical system can suppress aberration fluctuations when focusing on a short-distance object.
- the variable magnification optical system adopts an inner focus method and performs focusing with a small and lightweight lens, so that the burden on the autofocus mechanism is small.
- variable magnification optical system can perform focusing from an object at infinity to a near object by moving the focusing group (third lens group) along the optical axis. It is. With this configuration, it is possible to satisfactorily correct aberration fluctuations during focusing.
- the zoom optical system includes, in order from the object side, a first lens group having a positive refractive power and a second lens group having a negative refractive power (negative lens group).
- a first lens group having a positive refractive power and a second lens group having a negative refractive power (negative lens group).
- 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
- Conditional expression (2) defines the ratio between the focal length of the first lens group and the focal length of the second lens group.
- variable magnification optical system when the corresponding value of the conditional expression (2) is lower than the lower limit value, the refractive power of the first lens unit is increased. This is not preferable because it becomes difficult to correct spherical aberration and longitudinal chromatic aberration in the telephoto end state.
- the lower limit value of conditional expression (2) is 2.50.
- the lower limit value of the conditional expression (2) is 2.85.
- conditional expression (2) when the corresponding value of the conditional expression (2) exceeds the upper limit value, the refractive power of the second lens group increases. This is not preferable because correction of coma and astigmatism becomes difficult in the wide-angle end state.
- the upper limit value of conditional expression (2) is 3.70. In order to make the effect more reliable, it is preferable that the upper limit value of conditional expression (2) is 3.63.
- variable magnification optical system includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power (negative lens group), and a positive refractive power.
- a distance between the first lens group and the second lens group changes, and a distance between the second lens group and the third lens group changes during zooming.
- f2 focal length of the second lens group
- ff focal length of the third lens group
- Conditional expression (3) defines the ratio of the focal length of the second lens group and the focal length of the third lens group.
- conditional expression (3) when the corresponding value of conditional expression (3) is below the lower limit, the refractive power of the third lens unit increases. This is not preferable because it becomes difficult to correct spherical aberration and coma in the telephoto end state.
- the lower limit value of conditional expression (3) is 1.40. In order to make the effect more reliable, it is preferable that the lower limit value of the conditional expression (3) is 1.61.
- the refractive power of the second lens group increases. This is not preferable because correction of coma and astigmatism becomes difficult in the wide-angle end state.
- the upper limit value of conditional expression (3) is 2.20. In order to make the effect more reliable, it is preferable that the upper limit value of conditional expression (3) is 2.16.
- variable magnification optical system includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power (negative lens group), and a positive refractive power. And a fourth lens group (positive lens group) having a positive refractive power, and at the time of 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, the distance between the third lens group and the fourth lens group changes, and at least a part of the fourth lens group is orthogonal to the optical axis.
- variable magnification optical system includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power (negative lens group), and a positive refractive power.
- a fourth lens group (positive lens group) having a positive refractive power and at the time of zooming, the distance between the first lens group and the second lens group changes, Preferably, the distance between the second 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 (4) is satisfied. Is possible. (4) 0.10 ⁇ ff / f4 ⁇ 0.90 However, ff: focal length of the third lens group f4: focal length of the fourth lens group
- Conditional expression (4) defines the ratio between the focal length of the third lens group and the focal length of the fourth lens group. In the variable magnification optical system, satisfying conditional expression (4) makes it possible to satisfactorily correct spherical aberration, coma aberration, and astigmatism in the telephoto end state.
- variable magnification optical system when the corresponding value of conditional expression (4) is below the lower limit value, the refractive power of the third lens unit increases. This is not preferable because it becomes difficult to correct spherical aberration and coma in the telephoto end state.
- the lower limit value of conditional expression (4) is 0.20. In order to further secure the effect, it is preferable that the lower limit value of conditional expression (4) is 0.24.
- variable magnification optical system when the corresponding value of the conditional expression (4) exceeds the upper limit value, the refractive power of the fourth lens group increases. This is not preferable because correction of coma and astigmatism becomes difficult in the telephoto end state.
- variable magnification optical system includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power (negative lens group), and a positive refractive power.
- a distance between the first lens group and the second lens group changes, and a distance between the second lens group and the third lens group changes during zooming.
- conditional expression (5) 60.00 ⁇ d3
- ⁇ d3 Abbe number of the single lens included in the third lens group
- Conditional expression (5) defines the Abbe number of a single lens in the third lens group.
- conditional expression (5) In a variable magnification optical system, if the corresponding value of conditional expression (5) is less than the lower limit, it is not preferable because it is difficult to correct longitudinal chromatic aberration and spherical aberration in the telephoto end state. In order to secure the effect, it is preferable to set the lower limit value of conditional expression (5) to 63.00. In order to further secure the effect, it is preferable that the lower limit value of conditional expression (5) is 64.00.
- the optical device includes a variable magnification optical system having the above-described configuration. Thereby, an optical device having good optical performance 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 negative lens group, and a focusing group disposed between the negative lens group and an aperture stop, wherein the first lens group and the negative The distance between the lens group is changed and the distance between the negative lens group and the stop is changed, and at the time of focusing, the lens is disposed at a position facing the object side of the focusing group and the focusing group.
- a variable power optical system that is composed of a single lens having power and satisfies the following conditional expression (1): It is a method. Thereby, a variable magnification optical system having good optical performance can be manufactured.
- (1) 1.40 ⁇ f1 / ff ⁇ 2.20
- f1 Focal length of the first lens group
- ff Focal length of the focusing group
- the zoom optical system manufacturing method includes, in order from the object side, 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 single lens having a positive refractive power.
- the zoom optical system satisfies the following conditional expression (1) so that the distance between the lens groups changes during zooming from the wide-angle end state to the telephoto end state. Thereby, a variable magnification optical system having good optical performance can be manufactured.
- (1) 1.40 ⁇ f1 / ff ⁇ 2.20
- f1 Focal length ff of the first lens group
- ff Focal length of the third lens group
- FIG. 1 is a cross-sectional view of the variable magnification optical system according to the first example in the wide-angle end state. 1 and FIG. 4, FIG. 7 and FIG. 10, which will be described later, indicate the movement trajectory of each lens group during zooming from the wide-angle end state (W) to the telephoto end state (T).
- variable magnification optical system 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 third lens having a positive refractive power.
- the lens group G3 includes a fourth lens group G4 having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a positive meniscus lens L11 having a convex surface facing the object side, and a cemented lens of a negative meniscus lens L12 having a convex surface facing the object side and a biconvex positive lens L13.
- the second lens group G2 includes, in order from the object side, a cemented 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 aperture stop S, a cemented lens of a biconvex positive lens L41, a negative meniscus lens L42 having a convex surface on the image side, and a positive surface having a convex surface on the image side. It consists of a cemented lens of a meniscus lens L43 and a biconcave negative lens L44, a biconvex positive lens L45, and a negative meniscus lens L46 with a convex surface facing the image side.
- the air gap between the first lens group G1 and the second lens group G2 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state is arranged along the optical axis so that the air gap between G2 and the third lens group G3 and the air gap between the third lens group G3 and the fourth lens group G4 are changed. Move each.
- the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to an object at a short distance.
- the image stabilization is achieved by moving the cemented lens of the positive meniscus lens L43 and the negative lens L44 in the fourth lens group G4 so as to include a component in a direction orthogonal to the optical axis. I do.
- Table 1 below lists values of specifications of the variable magnification optical system according to the present example.
- f represents the focal length
- Bf represents the back focus (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 interval (the interval between the nth surface (n is an integer) and the n + 1th 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.
- FNO is the F number
- ⁇ is the half angle of view (unit is “°”)
- Y is the image height
- TL is the total length of the variable magnification optical system according to the present embodiment (from the first surface to the image surface I).
- Dn represents the variable distance between the nth surface and the (n + 1) th surface.
- W represents the wide-angle end state
- M represents the intermediate focal length state
- T represents the telephoto end state.
- d0 represents the distance from the object to the first surface.
- [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
- FIG. 2 (a), 2 (b) and 2 (c) are respectively when an 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.
- FIG. 3 (a), 3 (b) and 3 (c) are respectively 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 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 in this embodiment are used in the aberration diagrams of each embodiment described later.
- variable magnification optical system according to the present example has various aberrations corrected satisfactorily and has excellent imaging performance.
- FIG. 4 is a cross-sectional view of the variable magnification optical system according to the second example in the wide-angle end state.
- the variable magnification optical system according to the present 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 third lens having a positive refractive power.
- the lens group G3 includes a fourth lens group G4 having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface directed toward the object side and a biconvex positive lens L12.
- the second lens group G2 includes, in order from the object side, a cemented lens of a biconvex positive lens L21 and a biconcave negative lens L22, 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 aperture stop S, a cemented lens of a biconvex positive lens L41, a negative meniscus lens L42 having a convex surface on the image side, and a positive surface having a convex surface on the image side. It consists of a cemented lens of a meniscus lens L43 and a biconcave negative lens L44, a biconvex positive lens L45, and a negative meniscus lens L46 with a convex surface facing the image side.
- the air gap between the first lens group G1 and the second lens group G2 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state is arranged along the optical axis so that the air gap between G2 and the third lens group G3 and the air gap between the third lens group G3 and the fourth lens group G4 are changed. Move each.
- the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to an object at a short distance.
- the image stabilization is achieved by moving the cemented lens of the positive meniscus lens L43 and the negative lens L44 in the fourth lens group G4 so as to include a component in a direction orthogonal to the optical axis. I do.
- Table 2 below provides values of specifications of the variable magnification optical system according to the present example.
- FIG. 5 (a), 5 (b) and 5 (c) are respectively when an 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.
- FIG. 6 (a), 6 (b) and 6 (c) are respectively when a short distance object is focused 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.
- variable magnification optical system according to the present example has various aberrations corrected satisfactorily and has excellent imaging performance.
- FIG. 7 is a cross-sectional view of the zoom optical system according to the third example in the wide-angle end state.
- the variable magnification optical system according to the present 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 third lens having a positive refractive power.
- the lens group G3 includes a fourth lens group G4 having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface directed toward the object side and a biconvex positive lens L12.
- the second lens group G2 includes, in order from the object side, a cemented 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, a cemented lens of a biconvex positive lens L41 and a biconcave negative lens L42, an aperture stop S, and a positive meniscus lens L43 with a convex surface facing the image side. It consists of a cemented lens with a biconcave negative lens L44, a biconvex positive lens L45, a biconvex positive lens L46, and a biconcave negative lens L47.
- the air gap between the first lens group G1 and the second lens group G2 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state is arranged along the optical axis so that the air gap between G2 and the third lens group G3 and the air gap between the third lens group G3 and the fourth lens group G4 are changed. Move each.
- the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to an object at a short distance.
- the image stabilization is achieved by moving the cemented lens of the positive meniscus lens L43 and the negative lens L44 in the fourth lens group G4 so as to include a component in a direction orthogonal to the optical axis. I do. Table 3 below lists values of specifications of the variable magnification optical system according to the present example.
- FIGS. 8A, 8B, and 8C are respectively focused 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 third example.
- FIGS. 9A, 9B, and 9C are diagrams for focusing 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, respectively.
- FIG. 9A, 9B, and 9C are diagrams for focusing 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, respectively.
- variable magnification optical system according to the present example has various aberrations corrected satisfactorily and has excellent imaging performance.
- FIG. 10 is a sectional view of the zoom optical system according to the fourth example in the wide-angle end state.
- the variable magnification optical system according to the present 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 third lens having a positive refractive power.
- the lens group G3 includes a fourth lens group G4 having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a positive meniscus lens L11 having a convex surface facing the object side, 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. It consists of a cemented lens.
- the second lens group G2 includes, in order from the object side, a cemented 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, a positive meniscus lens L41 having a convex surface directed toward the object side, a cemented lens of a biconvex positive lens L42 and a biconcave negative lens L43, an aperture stop S, A cemented lens of a positive meniscus lens L44 having a convex surface facing the image side and a biconcave negative lens L45, and a cemented lens of a negative meniscus lens L46 having a convex surface facing the object side and a biconvex positive lens L47; And a negative meniscus lens L48 having a convex surface directed toward the object side.
- the air gap between the first lens group G1 and the second lens group G2 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state is arranged along the optical axis so that the air gap between G2 and the third lens group G3 and the air gap between the third lens group G3 and the fourth lens group G4 are changed. Move each.
- the third lens group G3 is moved to the image side along the optical axis, thereby focusing from an object at infinity to an object at a short distance.
- the image stabilization is achieved by moving the cemented lens of the positive meniscus lens L44 and the negative lens L45 in the fourth lens group G4 so as to include a component in a direction perpendicular to the optical axis. I do. Table 4 below lists values of specifications of the variable magnification optical system according to the present example.
- FIG. 11 (a), 11 (b), and 11 (c), respectively, are focused 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 fourth example.
- FIG. 12 (a), 12 (b), and 12 (c), respectively, are those 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 fourth example.
- FIG. 12 (a), 12 (b), and 12 (c), respectively, are those 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 fourth example.
- variable magnification optical system according to the present example has various aberrations corrected satisfactorily and has excellent imaging performance.
- each of the above embodiments it is possible to realize a variable magnification optical system having a good optical performance while having an anti-vibration function.
- each said Example has shown one specific example of this invention, and this invention 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 application is not limited to this, and a variable magnification optical system of another group configuration (for example, five groups) can also be configured. 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 variable magnification optical system may be used.
- the variable magnification optical system uses the third lens group consisting of one positive single lens as the focusing group (focusing lens group) on the optical axis in order to focus from an object at infinity to an object at a short distance. It is the structure moved along.
- the above focusing group can also be applied to autofocus, and is also suitable for driving by an autofocus motor, such as an ultrasonic motor.
- any lens group or a part thereof is moved as an anti-vibration lens group so as to include a component in a direction perpendicular to the optical axis, or an in-plane direction including the optical axis It can also be set as the structure which carries out anti-vibration by carrying out rotational movement (oscillation) to (F).
- 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 be disposed in the fourth lens group, and a configuration may be adopted in which the role is replaced by a lens frame without providing a member as the 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 so-called mirrorless camera of an interchangeable lens type that includes 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 (not shown) that is not shown is collected by the taking lens 2, and passes through an OLPF (Optical Low Pass Filter) that is not shown on the imaging surface of the imaging unit 3. Form a subject image. 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. That is, the camera 1 can realize good optical performance. Even if a camera equipped with the variable magnification optical system according to the second to fourth embodiments as the photographing 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.
- FIGS. 14 and 15 are diagrams showing an outline of a method for manufacturing a variable magnification optical system.
- the zoom 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 variable magnification optical system manufacturing method including a negative lens group having power and a focusing group disposed between the negative lens group and an aperture stop, and includes the following steps S1 to S3.
- step S1 at the time of zooming, the distance between the first lens group and the negative lens group is changed, and the distance between the negative lens group and the stop is changed.
- the distance between the focusing group (at least part of the third lens group) and the lens disposed at the position facing the object side of the focusing group changes, and the focusing group (at least part of the third lens group) ) And a lens disposed at a position facing the image side of the focusing group.
- the focusing group is constituted by one single lens having a positive refractive power.
- step S3 the following conditional expression (1) is satisfied.
- f1 Focal length of the first lens group
- ff Focal length of the focusing group
- variable magnification optical system manufacturing method includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refractive power.
- a variable magnification optical system manufacturing method including a third lens group having a fourth lens group having a positive refractive power, and includes the following steps S1 to S3.
- Step S1 First to fourth lens groups are prepared, and the third lens group is made of one single lens having a positive refractive power. Then, each lens group is arranged in the lens barrel in order from the object side.
- Step S2 The variable magnification optical system is made to satisfy the following conditional expression (1).
- (1) 1.40 ⁇ f1 / ff ⁇ 2.20
- f1 Focal length ff of the first lens group
- ff Focal length of the third lens group
- Step S3 By providing a known moving mechanism in the lens barrel, the distance between the lens groups is changed at the time of zooming from the wide-angle end state to the telephoto end state.
- variable magnification optical system According to the above method for manufacturing a variable magnification optical system, it is possible to manufacture a variable magnification optical system having good optical performance.
- G1 First lens group G2 Second lens group (negative lens group) G3 Third lens group (focusing group) G4 4th lens group (positive lens group) S aperture stop I image plane W wide-angle end state T telephoto end state
Abstract
Description
本願は、2014年12月26日に出願された日本国特許出願2014-266036号に基づき優先権を主張し、その内容をここに援用する。
1.40<f1/ff<2.20
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
1.40<f1/ff<2.20
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
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、
変倍時に、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、
前記第3レンズ群が、正の屈折力を有する1枚の単レンズからなり、
以下の条件式を満足する変倍光学系を提供する。
1.40<f1/ff<2.20
ただし、
f1:前記第1レンズ群の焦点距離
ff:前記第3レンズ群の焦点距離
前記変倍光学系を有する光学装置を提供する。
1.40<f1/ff<2.20
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
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レンズ群とを有する変倍光学系の製造方法であって、
前記第3レンズ群が、正の屈折力を有する1枚の単レンズからなるようにし、
前記変倍光学系が以下の条件式を満足するようにし、
変倍時に、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するようにする変倍光学系の製造方法を提供する。
1.40<f1/ff<2.20
ただし、
f1:前記第1レンズ群の焦点距離
ff:前記第3レンズ群の焦点距離
(1) 1.40<f1/ff<2.20
ただし、
f1:前記第1レンズ群の焦点距離
ff:前記合焦群(第3レンズ群)の焦点距離
(2) 2.00<f1/(-f2)<4.00
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
(3) 1.00<ff/(-f2)<2.30
ただし、
f2:前記第2レンズ群の焦点距離
ff:前記第3レンズ群の焦点距離
(4) 0.10<ff/f4<0.90
ただし、
ff:前記第3レンズ群の焦点距離
f4:前記第4レンズ群の焦点距離
(5) 60.00<νd3
ただし、
νd3:前記第3レンズ群に含まれる前記単レンズのアッベ数
(1)1.40<f1/ff<2.20
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
(1) 1.40<f1/ff<2.20
ただし、
f1:前記第1レンズ群の焦点距離
ff:前記第3レンズ群の焦点距離
(第1実施例)
図1は第1実施例に係る変倍光学系の広角端状態における断面図である。なお、図1及び後述する図4、図7及び図10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との接合レンズと、両凹形状の負レンズL23とからなる。
第4レンズ群G4は、物体側から順に、開口絞りSと、両凸形状の正レンズL41と像側に凸面を向けた負メニスカスレンズL42との接合レンズと、像側に凸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との接合レンズと、両凸形状の正レンズL45と、像側に凸面を向けた負メニスカスレンズL46とからなる。
また本実施例に係る変倍光学系では、第4レンズ群G4中の正メニスカスレンズL43と負レンズL44との接合レンズを光軸と直交する方向の成分を含むように移動させることにより防振を行う。
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。
[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、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 71.181 3.783 1.51680 63.88
2 215.901 0.095 1.00000
3 63.130 1.500 1.78472 25.64
4 39.888 7.004 1.48749 70.31
5 -337.340 可変
6 -522.329 1.200 1.72916 54.61
7 18.825 4.059 1.80518 25.45
8 50.914 3.117 1.00000
9 -43.738 1.100 1.80400 46.60
10 217.724 可変
11 94.133 3.391 1.49782 82.57
12 -41.765 可変
13(絞りS) ∞ 0.100 1.00000
14 29.229 4.644 1.56384 60.71
15 -31.326 1.100 1.80518 25.45
16 -2034.980 13.423 1.00000
17 -65.010 2.981 1.85026 32.35
18 -15.931 1.100 1.75500 52.34
19 42.547 4.150 1.00000
20 95.432 2.397 1.77250 49.62
21 -36.738 8.561 1.00000
22 -22.000 1.400 1.80100 34.92
23 -39.498 Bf
像面 ∞
[各種データ]
変倍比 3.43
W T
f 56.59 193.99
FNO 4.12 5.80
ω 14.31° 4.06°
Y 14.00 14.00
TL 148.31 170.32
Bf 39.30 63.82
<無限遠物体合焦時>
W M T
d0 ∞ ∞ ∞
d5 3.619 23.832 27.378
d10 34.229 11.631 1.500
d12 6.050 10.275 12.507
<近距離物体合焦時(撮影距離1.5m)>
W M T
d0 1351.68 1337.34 1329.67
d5 3.619 23.832 27.378
d10 36.680 18.152 9.762
d12 3.599 3.753 4.244
[レンズ群データ]
群 始面 f
1 1 89.021
2 6 -27.756
3 11 58.599
4 13 165.813
[条件式対応値]
(1) f1/ff = 1.52
(2) f1/(-f2) = 3.21
(3) ff/(-f2) = 2.11
(4) ff/f4 = 0.35
(5) νd3 = 82.57
図3(a)、図3(b)及び図3(c)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4は第2実施例に係る変倍光学系の広角端状態における断面図である。
本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、両凸形状の正レンズL21と両凹形状の負レンズL22との接合レンズと、両凹形状の負レンズL23とからなる。
第4レンズ群G4は、物体側から順に、開口絞りSと、両凸形状の正レンズL41と像側に凸面を向けた負メニスカスレンズL42との接合レンズと、像側に凸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との接合レンズと、両凸形状の正レンズL45と、像側に凸面を向けた負メニスカスレンズL46とからなる。
また本実施例に係る変倍光学系では、第4レンズ群G4中の正メニスカスレンズL43と負レンズL44との接合レンズを光軸と直交する方向の成分を含むように移動させることにより防振を行う。
以下の表2に、本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 63.095 1.500 1.80518 25.45
2 41.791 7.123 1.58913 61.22
3 -386.418 可変
4 479.014 3.954 1.80518 25.45
5 -32.519 1.100 1.72916 54.61
6 59.138 3.181 1.00000
7 -37.896 1.100 1.80400 46.60
8 743.156 可変
9 114.932 2.900 1.49782 82.57
10 -47.146 可変
11(絞りS) ∞ 0.100 1.00000
12 32.029 4.395 1.60300 65.44
13 -34.300 1.100 1.80518 25.45
14 -459.609 15.385 1.00000
15 -63.416 3.199 1.85026 32.35
16 -16.491 1.100 1.75500 52.34
17 44.329 5.586 1.00000
18 92.872 2.697 1.71999 50.26
19 -40.382 8.116 1.00000
20 -22.000 1.400 1.80100 34.92
21 -35.076 Bf
像面 ∞
[各種データ]
変倍比 3.43
W T
f 56.60 194.00
FNO 4.12 5.86
ω 14.25° 4.06°
Y 14.00 14.00
TL 148.32 180.32
Bf 39.01 65.83
<無限遠物体合焦時>
W M T
d0 ∞ ∞ ∞
d3 3.000 31.280 36.518
d8 34.644 12.104 1.500
d10 7.717 12.876 12.530
<近距離物体合焦時(撮影距離1.5m)>
W M T
d0 1351.67 1327.14 1319.67
d3 3.000 31.280 36.518
d8 36.933 18.430 9.778
d10 5.427 6.550 4.252
[レンズ群データ]
群 始面 f
1 1 109.858
2 4 -32.251
3 9 67.558
4 11 127.122
[条件式対応値]
(1) f1/ff = 1.63
(2) f1/(-f2) = 3.41
(3) ff/(-f2) = 2.09
(4) ff/f4 = 0.53
(5) νd3 = 82.57
図6(a)、図6(b)及び図6(c)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7は第3実施例に係る変倍光学系の広角端状態における断面図である。
本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との接合レンズと、両凹形状の負レンズL23とからなる。
第4レンズ群G4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との接合レンズと、開口絞りSと、像側に凸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との接合レンズと、両凸形状の正レンズL45と、両凸形状の正レンズL46と、両凹形状の負レンズL47とからなる。
また本実施例に係る変倍光学系では、第4レンズ群G4中の正メニスカスレンズL43と負レンズL44との接合レンズを光軸と直交する方向の成分を含むように移動させることにより防振を行う。
以下の表3に、本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 52.406 1.800 1.80518 25.45
2 38.475 8.542 1.48749 70.31
3 -284.767 可変
4 -199.633 1.200 1.79500 45.31
5 20.975 3.861 1.80518 25.45
6 77.691 3.309 1.00000
7 -41.578 1.200 1.60300 65.44
8 934.959 可変
9 132.334 3.206 1.60300 65.44
10 -49.998 可変
11 23.991 4.868 1.49782 82.57
12 -45.086 1.100 1.84666 23.80
13 540.330 4.000 1.00000
14(絞りS) ∞ 7.518 1.00000
15 -65.783 2.726 1.90366 31.27
16 -17.427 1.100 1.77250 49.62
17 36.809 2.000 1.00000
18 43.409 2.613 1.58913 61.22
19 -46.365 7.365 1.00000
20 65.436 2.969 1.51823 58.82
21 -74.103 1.270 1.00000
22 -22.594 1.300 1.48749 70.31
23 90.297 Bf
像面 ∞
[各種データ]
変倍比 3.43
W T
f 56.60 194.00
FNO 4.03 5.87
ω 14.30° 4.06°
Y 14.00 14.00
TL 145.47 177.47
Bf 39.01 65.81
<無限遠物体合焦時>
W M T
d0 ∞ ∞ ∞
d3 1.945 30.560 35.645
d8 33.942 11.510 1.500
d10 8.611 12.554 12.554
<近距離物体合焦時(撮影距離1.5m)>
W M T
d0 1354.52 1330.98 1322.52
d3 1.945 30.560 35.645
d8 36.720 18.240 9.780
d10 5.834 5.824 4.273
[レンズ群データ]
群 始面 f
1 1 113.015
2 4 -33.355
3 9 60.579
4 11 212.840
[条件式対応値]
(1) f1/ff = 1.87
(2) f1/(-f2) = 3.39
(3) ff/(-f2) = 1.82
(4) ff/f4 = 0.28
(5) νd3 = 65.44
図9(a)、図9(b)及び図9(c)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10は第4実施例に係る変倍光学系の広角端状態における断面図である。
本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との接合レンズと、両凹形状の負レンズL23とからなる。
第4レンズ群G4は、物体側から順に、物体側に凸面を向けた正メニスカスレンズL41と、両凸形状の正レンズL42と両凹形状の負レンズL43との接合レンズと、開口絞りSと、像側に凸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との接合レンズと、物体側に凸面を向けた負メニスカスレンズL46と両凸形状の正レンズL47との接合レンズと、物体側に凸面を向けた負メニスカスレンズL48とからなる。
また本実施例に係る変倍光学系では、第4レンズ群G4中の正メニスカスレンズL44と負レンズL45との接合レンズを光軸と直交する方向の成分を含むように移動させることにより防振を行う。
以下の表4に、本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 51.1394 5.8000 1.487490 70.31
2 1133.2099 0.1000 1.000000
3 82.0020 1.5000 1.672700 32.19
4 33.9780 6.2000 1.516800 63.88
5 133.9229 可変
6 -577.3429 1.0000 1.772500 49.62
7 21.5312 3.4000 1.846660 23.80
8 63.3609 3.4167 1.000000
9 -39.1089 1.0000 1.622990 58.12
10 126.2187 可変
11 2276.1596 3.2242 1.603000 65.44
12 -37.4736 可変
13 23.6470 3.8000 1.487490 70.31
14 161.4472 0.1000 1.000000
15 35.8671 4.4658 1.497820 82.57
16 -50.2203 1.6000 1.902000 25.26
17 64.6451 5.3469 1.000000
18(絞りS) ∞ 7.4591 1.000000
19 -157.1854 2.9000 1.850260 32.35
20 -14.7113 0.9000 1.795000 45.31
21 35.0299 2.2000 1.000000
22 29.4465 1.0000 1.806100 40.97
23 21.3319 3.3000 1.603420 38.03
24 -48.3688 11.6956 1.000000
25 -16.7768 1.0000 1.744000 44.81
26 -31.2907 Bf
像面 ∞
[各種データ]
変倍比 3.43
W M T
f 56.60 135.00 194.00
FNO 4.11 5.27 5.82
ω 14.23° 5.84° 4.07°
Y 14.00 14.00 14.00
TL 131.99 157.03 166.71
Bf 23.64 39.59 52.68
<無限遠物体合焦時>
W M T
d0 ∞ ∞ ∞
d5 2.595 24.025 28.556
d10 28.666 9.576 1.980
d12 5.674 12.431 12.086
<近距離物体合焦時(撮影距離1.5m)>
W M T
d0 1368.01 1342.97 1333.288
d5 2.595 24.025 28.5560
d10 30.970 14.542 8.1859
d12 3.371 7.464 5.8803
[レンズ群データ]
群 始面 f
1 1 108.548
2 6 -30.400
3 11 61.171
4 13 141.532
[条件式対応値]
(1) f1/ff = 1.77
(2) f1/(-f2) = 3.57
(3) ff/(-f2) = 2.01
(4) ff/f4 = 0.43
(5) νd3 = 65.44
図12(a)、図12(b)及び図12(c)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、撮影者はカメラ1による被写体の撮影を行うことができる。
(1) 1.40<f1/ff<2.20
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
(1) 1.40<f1/ff<2.20
ただし、
f1:第1レンズ群の焦点距離
ff:第3レンズ群の焦点距離
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)
S 開口絞り
I 像面
W 広角端状態
T 望遠端状態。
Claims (11)
- 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、
前記負レンズ群と開口絞りとの間に配置された合焦群と、を有し、
変倍時に、前記第1レンズ群と前記負レンズ群との間隔が変化し、前記負レンズ群と前記絞りとの間隔が変化し、
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し、
前記合焦群が、正の屈折力を有する1枚の単レンズからなり、
以下の条件式を満足する変倍光学系。
1.40<f1/ff<2.20
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 - 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、
少なくとも一部に光軸と直交方向の成分を持つように移動可能な防振群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、
変倍時に、前記第1レンズ群と前記負レンズ群との間隔が変化し、前記負レンズ群と前記正レンズ群との間隔が変化し、
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し、
前記合焦群が、正の屈折力を有する1枚の単レンズからなり、
以下の条件式を満足する変倍光学系。
1.40<f1/ff<2.20
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 - 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、
変倍時に、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、
前記第3レンズ群が、正の屈折力を有する1枚の単レンズからなり、
以下の条件式を満足する変倍光学系。
1.40<f1/ff<2.20
ただし、
f1:前記第1レンズ群の焦点距離
ff:前記第3レンズ群の焦点距離 - 前記第3レンズ群を光軸に沿って移動させることにより合焦を行う請求項3に記載の変倍光学系。
- 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、
変倍時に、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から請求項4のいずれか一項に記載の変倍光学系。
2.00<f1/(-f2)<4.00
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 - 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、
変倍時に、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、
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。
1.00<ff/(-f2)<2.30
ただし、
f2:前記第2レンズ群の焦点距離
ff:前記第3レンズ群の焦点距離 - 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、
変倍時に、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、
前記第4レンズ群の少なくとも一部が光軸と直交する方向の成分を含むように移動する請求項1から請求項6のいずれか一項に記載の変倍光学系。 - 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、
変倍時に、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から請求項7のいずれか一項に記載の変倍光学系。
0.10<ff/f4<0.90
ただし、
ff:前記第3レンズ群の焦点距離
f4:前記第4レンズ群の焦点距離 - 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、
変倍時に、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、
以下の条件式を満足する請求項1から請求項8のいずれか一項に記載の変倍光学系。
60.00<νd3
ただし、
νd3:前記第3レンズ群に含まれる単レンズのアッベ数 - 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を有する光学装置。
- 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、
前記負レンズ群と開口絞り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、
変倍時に、前記第1レンズ群と前記負レンズ群との間隔が変化し、前記負レンズ群と前記絞りと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、
前記合焦群が、正の屈折力を有する1枚の単レンズからなるように構成し、
以下の条件式を満足する変倍光学系の製造方法。
1.40<f1/ff<2.20
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
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JPH07113955A (ja) * | 1993-10-18 | 1995-05-02 | Minolta Co Ltd | ズームレンズ |
JP2001033698A (ja) * | 1999-07-26 | 2001-02-09 | Canon Inc | リアフォーカス式ズームレンズ及びそれを用いた光学機器 |
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JPH07113955A (ja) * | 1993-10-18 | 1995-05-02 | Minolta Co Ltd | ズームレンズ |
JP2001033698A (ja) * | 1999-07-26 | 2001-02-09 | Canon Inc | リアフォーカス式ズームレンズ及びそれを用いた光学機器 |
WO2013146758A1 (ja) * | 2012-03-30 | 2013-10-03 | 株式会社ニコン | 変倍光学系、光学装置、および変倍光学系の製造方法 |
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