WO2012070559A1 - 変倍光学系、光学機器、および変倍光学系の製造方法 - Google Patents
変倍光学系、光学機器、および変倍光学系の製造方法 Download PDFInfo
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- WO2012070559A1 WO2012070559A1 PCT/JP2011/076882 JP2011076882W WO2012070559A1 WO 2012070559 A1 WO2012070559 A1 WO 2012070559A1 JP 2011076882 W JP2011076882 W JP 2011076882W WO 2012070559 A1 WO2012070559 A1 WO 2012070559A1
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- 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
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145121—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+-+
-
- 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
- G02B15/146—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 more than five groups
- G02B15/1461—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 more than five groups the first group being positive
-
- 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
-
- 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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
- G03B3/02—Focusing arrangements of general interest for cameras, projectors or printers moving lens along baseboard
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- the present invention relates to a variable magnification optical system, an optical apparatus, and a method for manufacturing the variable magnification optical system.
- the present invention has been made in view of such problems, and has a variable power optical system, an optical apparatus, and a variable power optical system that have a high variable power ratio and have good optical performance with sufficiently corrected aberrations.
- An object of the present invention is to provide a manufacturing method of the system.
- the first aspect of the present invention is configured 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. And a third lens group having a negative refracting power, and a fifth lens group having a positive refracting power. It is fixed in the optical axis direction, and at the time of focusing, at least a part of the third lens group moves along the optical axis.
- variable magnification optical system when the focal length of the first lens group is f1, and the focal length of the third lens group is f3, the following conditional expression (1) 0.010 ⁇ f1 / f3 ⁇ 1.410 (1)
- the focal length of the third lens group is f3 and the focal length of the fourth lens group is f4, the following conditional expression (3) 0.370 ⁇ f3 / ( ⁇ f4) ⁇ 0.620 (3) Is preferably satisfied.
- the focal length of the fourth lens group is f4 and the focal length of the fifth lens group is f5
- At least a part of the fourth lens group moves so as to include a component in a direction orthogonal to the optical axis.
- 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.
- the distance between the fourth lens group and the fourth lens group changes, and the distance between the fourth lens group and the fifth lens group changes.
- all lens surfaces are spherical surfaces.
- a second aspect of the present invention provides an optical apparatus characterized by having a variable magnification optical system according to the first aspect of the present invention.
- a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power A method of manufacturing a variable magnification optical system having a fourth lens group having a negative refractive power and a fifth lens group having a positive refractive power.
- the first lens unit is arranged so as to move along the optical axis at the time of focusing, and the focal length of the first lens unit is f1,
- the focal length of the third lens group is f3
- the following conditional expression (1) 0.010 ⁇ f1 / f3 ⁇ 1.410 (1) Is provided so as to satisfy the above requirements.
- variable magnification optical system an optical apparatus, and a method for manufacturing the variable magnification optical system that have a good optical performance in which aberrations are sufficiently corrected while having a high variable magnification ratio.
- FIG. 1 is a sectional view showing a configuration of a variable magnification optical system according to the first example of the present embodiment.
- 2A, 2B, and 2C are aberration diagrams in the wide-angle end state of the variable magnification optical system according to the first example.
- FIG. 2A shows various aberrations at the time of focusing on infinity
- 3A and 3B are aberration diagrams in the intermediate focal length state of the variable magnification optical system according to the first example.
- FIG. 3A shows various aberrations at the time of focusing on infinity
- FIG. 4A, 4B, and 4C are aberration diagrams in the telephoto end state of the variable magnification optical system according to the first example.
- FIG. 4A shows various aberrations at the time of focusing on infinity
- FIG. 5 is a cross-sectional view showing the configuration of the variable magnification optical system according to the second example of the present embodiment.
- 6A, 6B, and 6C are aberration diagrams in the wide-angle end state of the variable magnification optical system according to Example 2.
- FIG. 6A shows various aberrations at the time of focusing on infinity
- 7A and 7B are aberration diagrams in the intermediate focal length state of the variable magnification optical system according to the second example.
- FIG. 7A shows various aberrations at the time of focusing on infinity
- 8A, 8B, and 8C are aberration diagrams in the telephoto end state of the variable magnification optical system according to the second example.
- FIG. 8A shows various aberrations at the time of focusing on infinity
- FIG. 9 is a cross-sectional view showing the configuration of the variable magnification optical system according to the third example of the present embodiment.
- 10A, 10B, and 10C are aberration diagrams in the wide-angle end state of the variable magnification optical system according to the third example.
- FIG. 10A shows various aberrations at the time of focusing on infinity
- FIG. 11A and 11B are aberration diagrams in the intermediate focal length state of the variable magnification optical system according to the third example.
- FIG. 11A shows various aberrations at the time of focusing on infinity
- 12A, 12B, and 12C are aberration diagrams in the telephoto end state of the variable magnification optical system according to the third example.
- FIG. 12A shows various aberrations at the time of focusing on infinity
- FIG. 12A shows various aberrations at the time of focusing on infinity
- FIG. 13 is a cross-sectional view showing a configuration of a variable magnification optical system according to the fourth example of the present embodiment.
- 14A, 14B, and 14C are aberration diagrams in the wide-angle end state of the variable magnification optical system according to the fourth example.
- FIG. 14A shows various aberrations at the time of focusing on infinity
- 15A and 15B are aberration diagrams in the intermediate focal length state of the zoom optical system according to the fourth example.
- FIG. 15A shows various aberrations at the time of focusing on infinity
- FIG. 16A, 16B, and 16C are aberration diagrams in the telephoto end state of the variable magnification optical system according to the fourth example.
- FIG. 16A shows various aberrations at the time of focusing on infinity
- FIG. 17 is an explanatory diagram showing a cross section of a single-lens reflex camera having a variable magnification optical system according to the present embodiment.
- FIG. 18 is a flowchart showing an outline of a method for manufacturing a variable magnification optical system according to the present embodiment.
- the variable magnification optical system ZL 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, A third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power are configured. Further, in the zoom optical system ZL, the first lens group G1 is fixed in the optical axis direction with respect to the image plane during zooming, and at least a part of the third lens group G3 during focusing. Is configured to move along the optical axis.
- the variable magnification optical system ZL can also have a six-group configuration as shown in FIG.
- the zoom optical system ZL of the present embodiment satisfies the following conditional expression (1) when the focal length of the first lens group G1 is f1 and the focal length of the third lens group G3 is f3. It is characterized by. 0.010 ⁇ f1 / f3 ⁇ 1.410 (1)
- variable magnification optical system ZL is configured to have five or more lens groups as a whole, and the movable group is at least four of these lens groups, thereby simplifying the configuration. Yes. For this reason, it becomes easy to suppress a decrease in optical performance due to decentering of the lens, and a variable magnification optical system ZL having stable and good optical performance can be realized.
- the zoom optical system ZL makes the first lens group G1 a fixed group at the time of zooming, so that the center of gravity hardly changes and it is easy to handle.
- the structure will be stable and resistant to impact by eliminating contact with an external object of the variable magnification optical system due to falling by its own weight and reducing the number of moving lens groups.
- the third lens group G3 is smaller and lighter than the first lens group G1. Therefore, focusing can be performed at high speed by configuring the third lens group G3 to move on the optical axis as a lens group for focusing.
- Conditional expression (1) defines the ratio between the focal length f1 of the first lens group G1 and the focal length f3 of the third lens group G3.
- the present variable magnification optical system ZL can realize good optical performance by satisfying the conditional expression (1).
- the value of f1 / f3 exceeds the upper limit value of the conditional expression (1), the refractive power of the first lens group G1 becomes weak. For this reason, it is difficult to sufficiently reduce the field curvature generated in the first lens group G1, which is not preferable.
- the curvature of field deteriorates, which is not preferable.
- Conditional expression (2) defines the ratio between the focal length f2 of the second lens group G2 and the focal length f4 of the fourth lens group G4.
- the present variable magnification optical system ZL can realize good optical performance by satisfying the conditional expression (2).
- the refractive power of the second lens group G2 becomes strong. Therefore, it is not preferable because it becomes difficult to sufficiently reduce the coma generated in the second lens group G2.
- conditional expression (2) when the value of f2 / f4 exceeds the upper limit value of the conditional expression (2), the refractive power of the fourth lens group G4 becomes strong. For this reason, it is difficult to sufficiently reduce the coma generated in the fourth lens group G4. In order to secure the effect of the present embodiment, it is preferable to set the upper limit value of conditional expression (2) to 0.300.
- Conditional expression (3) defines the ratio between the focal length f3 of the third lens group G3 and the focal length f4 of the fourth lens group G4.
- the present variable magnification optical system ZL can realize good optical performance by satisfying the conditional expression (3).
- the value of f3 / ( ⁇ f4) falls below the lower limit value of the conditional expression (3), the refractive power of the third lens group G3 becomes strong. Therefore, it is not preferable because it becomes difficult to sufficiently reduce the negative spherical aberration generated in the third lens group G3.
- the refractive power of the fourth lens group G4 becomes strong. Therefore, it is not preferable because it is difficult to sufficiently reduce the positive spherical aberration generated in the fourth lens group G4. In order to secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (3) to 0.600.
- the zoom optical system ZL it is preferable that the following conditional expression (4) is satisfied when the focal length of the fourth lens group G4 is f4 and the focal length of the fifth lens group G5 is f5. 1.140 ⁇ ( ⁇ f4) / f5 ⁇ 1.540 (4)
- Conditional expression (4) defines the ratio between the focal length f4 of the fourth lens group G4 and the focal length f5 of the fifth lens group G5.
- the present variable magnification optical system ZL can realize good optical performance by satisfying the conditional expression (4).
- the refractive power of the fourth lens group G4 becomes strong. Therefore, it is not preferable because it is difficult to sufficiently reduce the positive distortion generated in the fourth lens group G4.
- the zoom optical system ZL it is preferable that at least a part of the fourth lens group G4 moves so as to have a component in a direction orthogonal to the optical axis. Thereby, image plane correction at the time of image blur occurrence can be performed, and good optical performance can be realized.
- variable magnification optical system ZL is arranged such that the distance between the first to fifth lens groups G1 to G5 (the distance between the first lens group G1 and the second lens group G2, the second lens) It is preferable that the distance between the group G2 and the third lens group G3, the distance between the third lens group G3 and the fourth lens group G4, and the distance between the fourth lens group G4 and the fifth lens group G5) change. With this configuration, a high zoom ratio can be ensured, and aberration correction at the time of zooming can be facilitated.
- variable magnification optical system ZL it is preferable that all lens surfaces are spherical surfaces. It is preferable that the lens surface is a spherical surface because lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to errors in processing and assembly adjustment is prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance. The same applies to a flat lens surface.
- FIG. 17 shows a schematic cross-sectional view of a single-lens reflex camera 1 (hereinafter simply referred to as a camera) as an optical apparatus including the above-described variable magnification optical system ZL.
- a camera single-lens reflex camera 1
- variable magnification optical system ZL variable magnification optical system
- light from an object (subject) (not shown) is collected by the taking lens 2 (variable magnification optical system ZL) and imaged on the focusing screen 4 via the quick return mirror 3.
- the light imaged on the focusing screen 4 is reflected a plurality of times in the pentaprism 5 and guided to the eyepiece lens 6.
- the photographer can observe the object (subject) image as an erect image through the eyepiece 6.
- the quick return mirror 3 is retracted out of the optical path, and light of an object (subject) (not shown) condensed by the photographing lens 2 is captured on the image sensor 7. Form an image. Thereby, the light from the object (subject) is captured by the image sensor 7 and recorded as an object (subject) image in a memory (not shown). In this way, the photographer can shoot an object (subject) with the camera 1.
- the camera 1 shown in FIG. 17 may hold the variable magnification optical system ZL in a detachable manner, or may be formed integrally with the variable magnification optical system ZL.
- the camera 1 may be a so-called single-lens reflex camera. Further, even a camera that does not have a quick return mirror can achieve the same effects as the above camera.
- each lens is arranged in a cylindrical barrel to prepare a lens group.
- a cemented lens of the negative meniscus lens L13 and the positive meniscus lens L14 having a convex surface facing the object side is arranged as the first lens group G1, and in order from the object side, the negative meniscus lens L21 having a convex surface facing the object side, both A cemented lens of a concave lens L22 and a biconvex lens L23, and a negative meniscus lens L24 having a concave surface facing the object side are arranged as a second lens group G2, and in order from the object side, the biconvex lens L31, the biconvex lens L32 and the object side are arranged.
- a third lens unit is formed by arranging a cemented lens with a negative meniscus lens L33 having a concave surface and a negative meniscus lens L34 having a convex surface facing the object side.
- a positive meniscus lens L41 having a convex surface facing the object side, and a cemented lens of a biconcave lens L42 and a positive meniscus lens L43 having a convex surface facing the object side are arranged as a fourth lens group G4, and the fourth lens group
- An aperture stop S is disposed on the image side of G4, and a positive meniscus lens L51 having a convex surface facing the object side and a negative meniscus lens L52 having a convex surface facing the object side in order from the object side to the image side of the aperture stop S;
- a cemented lens with the biconvex lens L53 and a cemented lens with the biconcave lens L54 and the biconvex lens L55 are arranged to form a fifth lens group G5.
- Step S200 the first lens group G1 is arranged so as to be fixed in the optical axis direction with respect to the image plane during zooming.
- Step S300 At least a part of the third lens group G3 is arranged so as to move along the optical axis during focusing.
- Step S400 When these lens groups G1 to G5 have the focal length of the first lens group G1 as f1 and the focal length of the third lens group G3 as f3, the conditional expression (1) is satisfied. Deploy.
- the lenses When the lenses are assembled in the lens barrel, the lenses may be incorporated in the lens barrel one by one in the order along the optical axis, and some or all of the lenses are integrally held by the holding member and then assembled with the lens barrel member. May be.
- Step S500 After each lens is assembled in the lens barrel in this way, whether an image of an object is formed with each lens incorporated in the lens barrel, that is, whether the centers of the lenses are aligned. Check. Subsequently, various operations of the variable magnification optical system are confirmed. As an example of various operations, a zooming operation for zooming from the wide-angle end state to the telephoto end state (for example, the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens in FIG. 1). Lens group G5 moves along the optical axis direction), and a lens (for example, the third lens group G3 in FIG. 1) that focuses from an infinite object point to a short-distance object point moves along the optical axis direction.
- a zooming operation for zooming from the wide-angle end state to the telephoto end state for example, the second lens group G2, the third lens group G3, the fourth lens group G4, and the fifth lens in FIG. 1).
- Lens group G5 moves along the optical axis
- a camera shake correction operation for moving at least a part of the lenses (for example, the fourth lens group G4 in FIG. 1) so as to have a component in a direction orthogonal to the optical axis. Note that the order of confirming the various operations is arbitrary.
- variable magnification optical system ZL having an excellent optical performance, suitable for a photographic camera, an electronic still camera, a video camera, etc., and having corrected chromatic aberration, and an optical apparatus (for example, the camera 1) having the same. Can be provided.
- FIG. 1, FIG. 5, FIG. 9, and FIG. 13 are cross-sectional views showing the configuration of the variable magnification optical system ZL (ZL1 to ZL4) according to each example. Further, in the lower part of the sectional views of these variable magnification optical systems ZL1 to ZL4, the light of each of the lens groups G1 to G5 (or G6) when changing magnification from the wide-angle end state (W) to the telephoto end state (T) is shown. The direction of movement along the axis is indicated by an arrow (the first lens group G1 is fixed in the optical axis direction with respect to the image plane during zooming).
- FIG. 1 shows a lens configuration diagram and zoom locus of the variable magnification optical system ZL1 according to the first example.
- the zoom optical system ZL1 according to the first example includes a first lens group G1 having a positive refractive power and a first lens having a negative refractive power in order from the object side along the optical axis.
- the first lens group G1 includes, in order from the object side along the optical axis, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12, and a negative meniscus lens 13 having a convex surface facing the object side. It has a cemented lens with a positive meniscus lens L14 having a convex surface facing the object side.
- the second lens group G2 includes, in order from the object side along the optical axis, a negative meniscus lens L21 having a convex surface facing the object side, a cemented lens of the biconcave lens L22 and the biconvex lens L23, and a concave surface facing the object side. And a negative meniscus lens L24.
- the third lens group G3 includes, in order from the object side along the optical axis, a cemented lens of a biconvex lens L31, a biconvex lens L32, and a negative meniscus lens L33 having a concave surface on the object side, and a convex surface on the object side. And a negative meniscus lens L34.
- the fourth lens group G4 includes, in order from the object side along the optical axis, a positive meniscus lens L41 having a convex surface directed toward the object side, and a biconcave lens L42 and a positive meniscus lens L43 having a convex surface directed toward the object side. Has a lens.
- the fifth lens group G5 includes a positive meniscus lens L51 having a convex surface facing the object side, a negative meniscus lens L52 having a convex surface facing the object side, and a biconvex lens L53, which are arranged in order from the object side along the optical axis.
- a cemented lens includes a cemented lens of a biconcave lens L54 and a biconvex lens L55.
- the zoom optical system ZL1 when zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group G1 and the second lens group G2 increases.
- the distance between the second lens group G2 and the third lens group G3 decreases, the distance between the third lens group G3 and the fourth lens group G4 changes, and the distance between the fourth lens group G4 and the fifth lens group G5.
- the second to fifth lens groups G2 to G5 move so as to decrease.
- the first lens group G1 is fixed with respect to the image plane I in the optical axis direction.
- the aperture stop S is disposed between the fourth lens group G4 and the fifth lens group G5, and moves together with the fourth lens group G4 upon zooming from the wide-angle end state to the telephoto end state.
- the third lens group G3 moves on the optical axis from the object side to the image side when focusing from an infinite object point to a short distance object point. .
- variable magnification optical system ZL1 the negative meniscus lens L41 and the cemented lens of the biconcave lens L42 and the positive meniscus lens L43 in the fourth lens group G4 are used as an anti-vibration lens group.
- image plane correction at the time of blurring is performed.
- the focal length of the entire system is f
- the blurring correction coefficient that is, the rotational blurring at an angle ⁇ with a lens whose ratio of the moving amount of the image on the image plane I to the moving amount of the image stabilizing lens group in the optical axis direction is K.
- K the blurring correction coefficient
- the shake correction coefficient K is ⁇ 0.785, and the focal length is 81.6 (mm). Therefore, image stabilization for correcting a rotational shake of 0.350 ° is performed.
- the moving amount of the lens group is ⁇ 0.635 (mm).
- the shake correction coefficient K is ⁇ 1.234 and the focal length is 392 (mm), so that the image stabilization for correcting the rotation shake of 0.160 ° is performed.
- the moving amount of the lens group is -0.885 (mm).
- Table 1 below lists values of each item of the variable magnification optical system ZL1 according to the first example.
- W is the wide-angle end state
- M is the intermediate focal length state
- T is the telephoto end state
- f is the focal length of the entire system
- FNO is the F number
- TL is the total length of the entire system (infinite (Distance on the optical axis from the first surface of the lens surface to the image plane I at the time of focusing in the distance) 2 ⁇ indicates the total angle of view
- ⁇ indicates the aperture stop diameter.
- the first column m is the order (surface number) of the lens surfaces from the object side along the traveling direction of the light beam
- the second column r is the radius of curvature of each lens surface
- the third column d Is the distance (surface spacing) on the optical axis from each optical surface to the next optical surface (or image surface I)
- the fourth column nd is the refractive index for the d-line (wavelength 587.6 nm)
- the fifth column ⁇ d is d
- the Abbe numbers for the lines are shown respectively.
- the surface numbers 1 to 34 shown in Table 1 correspond to the surfaces 1 to 34 shown in FIG.
- (Lens Group Data) the start surface (ST) and focal length of each of the first to fifth lens groups G1 to G5 are shown.
- INF indicates a focused state at an object point at infinity
- D0 is the distance on the optical axis from the vertex of the lens surface closest to the object side to the object in the variable magnification optical system ZL1.
- (Values corresponding to conditional expressions) shows values corresponding to each conditional expression.
- the focal length f, the radius of curvature r, the surface spacing d, and other length units listed in all the following specification values are generally “mm”.
- the optical system is proportionally enlarged or reduced.
- the same optical performance can be obtained, and the present invention is not limited to this.
- the radius of curvature of 0.0000 indicates a plane in the case of a lens surface, and indicates an aperture or a diaphragm surface in the case of a stop. Further, the refractive index of air of 1.0000 is omitted.
- the description of these symbols and the description of the specification table are the same in the following examples.
- FIG. 2A, 2B, and 2C are aberration diagrams in the wide-angle end state of the variable magnification optical system according to the first example.
- FIG. 2A shows various aberrations at the time of focusing on infinity
- 3A and 3B are aberration diagrams in the intermediate focal length state of the variable magnification optical system according to the first example.
- FIG. 3A shows various aberrations at the time of focusing on infinity
- FIG. 4A, 4B, and 4C are aberration diagrams in the telephoto end state of the variable magnification optical system according to the first example.
- FIG. 4A shows various aberrations at the time of focusing on infinity
- FNO represents the F number
- NA represents the numerical aperture
- Y represents the image height (unit: mm).
- d indicates aberration with respect to the d-line (wavelength 587.6 nm)
- g indicates aberration with respect to the g-line (wavelength 435.8 nm)
- those not described indicate aberration with respect to the d-line.
- the spherical aberration diagram shows the F-number value corresponding to the maximum aperture
- the astigmatism and distortion diagram shows 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. The description of these aberration diagrams is the same in the following examples.
- FIG. 5 shows a lens configuration diagram and zoom locus of the variable magnification optical system ZL2 according to the second example.
- the variable magnification optical system ZL2 according to the second example has a first lens group G1 having a positive refractive power and a negative refractive power in order from the object side along the optical axis. It has a second lens group G2, a third lens group G3 having a positive refractive power, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.
- the first lens group G1 includes, in order from the object side along the optical axis, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12, and a negative meniscus lens L13 having a convex surface facing the object side. It has a cemented lens with a positive meniscus lens L14 having a convex surface facing the object side.
- the second lens group G2 includes, in order from the object side along the optical axis, a negative meniscus lens L21 having a convex surface directed toward the object side, a cemented lens of a biconcave lens L22 and a biconvex lens L23, and a biconcave lens L24.
- the third lens group G3 includes, in order from the object side along the optical axis, a cemented lens of a biconvex lens L31 and a biconvex lens L32 and a negative meniscus lens L33 having a concave surface facing the object side.
- the fourth lens group G4 includes, in order from the object side along the optical axis, a cemented lens of a positive meniscus lens L41 having a concave surface facing the object side and a negative meniscus lens L42 having a concave surface facing the object side.
- the fifth lens group G5 includes a positive meniscus lens L51 having a convex surface directed toward the object side, a negative meniscus lens L52 having a convex surface directed toward the object side, and a biconvex positive lens L53 in order from the object side along the optical axis. And a cemented lens composed of a biconcave lens L54 and a biconvex lens L55.
- variable magnification optical system ZL2 In the variable magnification optical system ZL2 according to the second example having such a configuration, the distance between the first lens group G1 and the second lens group G2 is increased upon zooming from the wide-angle end state to the telephoto end state.
- the distance between the second lens group G2 and the third lens group G3 decreases, the distance between the third lens group G3 and the fourth lens group G4 changes, and the distance between the fourth lens group G4 and the fifth lens group G5.
- Each lens group is moved so as to decrease.
- the first lens group G1 is fixed with respect to the image plane I in the optical axis direction at the time of zooming from the wide-angle end state to the telephoto end state.
- the aperture stop S is disposed between the fourth lens group G4 and the fifth lens group G5, and moves together with the fourth lens group G4 upon zooming from the wide-angle end state to the telephoto end state.
- the third lens group G3 moves on the optical axis from the object side to the image side when focusing from an infinite object point to a short distance object point. .
- the cemented lens of the positive meniscus lens L41 and the negative meniscus lens L42 in the fourth lens group G4 is used as an anti-vibration lens group, and the anti-vibration lens group is used as an optical axis.
- image plane correction at the time of occurrence of blurring is performed.
- the shake correction coefficient K is ⁇ 0.638, and the focal length is 81.6 (mm). Therefore, the image stabilizing lens for correcting the rotational shake of 0.350 ° is used.
- the amount of movement of the group is -0.781 (mm).
- the image stabilizing lens for correcting the rotational shake of 0.160 ° is used.
- the amount of movement of the group is ⁇ 1.122 (mm).
- Table 2 below lists values of each item of the variable magnification optical system ZL2 according to the second example.
- the surface numbers 1 to 30 shown in Table 2 correspond to the surfaces 1 to 30 shown in FIG.
- FIG. 6A, 6B, and 6C are aberration diagrams in the wide-angle end state of the variable magnification optical system according to Example 2.
- FIG. 6A shows various aberrations at the time of focusing on infinity
- 7A and 7B are aberration diagrams in the intermediate focal length state of the variable magnification optical system according to the second example.
- FIG. 7A shows various aberrations at the time of focusing on infinity
- FIG. 8A, 8B, and 8C are aberration diagrams in the telephoto end state of the variable magnification optical system according to the second example.
- FIG. 8A shows various aberrations at the time of focusing on infinity
- FIG. 9 shows a lens configuration diagram and zoom locus of the variable magnification optical system ZL3 according to the third example.
- the variable magnification optical system ZL3 according to the third example includes, in order from the object side along the optical axis, the first lens group G1 having a positive refractive power and the first lens group G1 having a negative refractive power.
- the first lens group G1 includes, in order from the object side along the optical axis, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a positive meniscus lens L12 having a convex surface facing the object side, a biconvex lens L13, and It has a cemented lens of a negative meniscus lens L14 having a convex surface facing the object side and a positive meniscus lens L15 having a convex surface facing the object side.
- the second lens group G2 includes, in order from the object side along the optical axis, a negative meniscus lens L21 having a convex surface directed toward the object side, a cemented lens of a biconcave lens L22 and a biconvex lens L23, and a biconcave lens L24.
- the third lens group G3 includes, in order from the object side along the optical axis, a cemented lens of a biconvex lens L31 and a biconvex lens L32 and a negative meniscus lens L33 having a concave surface facing the object side.
- the fourth lens group G4 includes, in order from the object side along the optical axis, a cemented lens of a positive meniscus lens L41 having a concave surface facing the object side and a negative meniscus lens L42 having a concave surface facing the object side.
- the fifth lens group G5 includes, in order from the object side along the optical axis, a positive meniscus lens L51 having a convex surface facing the object side, and a cemented lens of a negative meniscus lens L52 having a convex surface facing the object side and a biconvex lens L53. And a cemented lens of a biconcave lens L54 and a biconvex lens L55.
- variable magnification optical system ZL3 In the variable magnification optical system ZL3 according to the third example having such a configuration, the distance between the first lens group G1 and the second lens group G2 increases upon zooming from the wide-angle end state to the telephoto end state.
- the distance between the second lens group G2 and the third lens group G3 decreases, the distance between the third lens group G3 and the fourth lens group G4 changes, and the fourth lens group G4 and the fifth lens group G5 change.
- Each lens group moves so that the interval decreases.
- the first lens group G1 is fixed with respect to the image plane I in the optical axis direction at the time of zooming from the wide-angle end state to the telephoto end state.
- the aperture stop S is disposed between the fourth lens group G4 and the fifth lens group G5, and moves together with the fourth lens group G4 upon zooming from the wide-angle end state to the telephoto end state.
- the third lens group G3 moves on the optical axis from the object side to the image side when focusing from an infinite object point to a short distance object point. .
- the cemented lens of the positive meniscus lens L41 and the negative meniscus lens L42 in the fourth lens group G4 is used as an anti-vibration lens group, and the anti-vibration lens group is used as an optical axis.
- image plane correction at the time of occurrence of blurring is performed.
- the shake correction coefficient K is ⁇ 0.571 and the focal length is 81.6 (mm). Therefore, the image stabilizing lens for correcting the rotational shake of 0.350 ° is used.
- the amount of movement of the group is -0.872 (mm).
- the shake correction coefficient K is ⁇ 0.870 and the focal length is 392 (mm), so that the image stabilization for correcting the rotation shake of 0.160 ° is performed.
- the moving amount of the lens group is ⁇ 1.256 (mm).
- Table 3 below lists values of various specifications of the variable magnification optical system ZL3 according to the third example.
- the surface numbers 1 to 32 shown in Table 7 correspond to the surfaces 1 to 32 shown in FIG.
- FIG. 10A, 10B, and 10C are aberration diagrams in the wide-angle end state of the variable magnification optical system according to the third example.
- FIG. 10A shows various aberrations at the time of focusing on infinity
- 11A and 11B are aberration diagrams in the intermediate focal length state of the variable magnification optical system according to the third example.
- FIG. 11A shows various aberrations at the time of focusing on infinity
- FIG. 12A, 12B, and 12C are aberration diagrams in the telephoto end state of the variable magnification optical system according to the third example.
- FIG. 12A shows various aberrations at the time of focusing on infinity
- FIG. 13 shows a lens configuration diagram and zoom locus of the zoom optical system ZL4 according to the fourth example.
- the zoom optical system ZL4 according to the fourth example includes a first lens group G1 having a positive refractive power and a first lens having a negative refractive power in order from the object side along the optical axis.
- a sixth lens group G6 is a sixth lens group G6.
- the first lens group G1 includes, in order from the object side along the optical axis, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex lens L12, and a negative meniscus lens 13 having a convex surface facing the object side. It has a cemented lens with a positive meniscus lens L14 having a convex surface facing the object side.
- the second lens group G2 includes, in order from the object side along the optical axis, a negative meniscus lens L21 having a convex surface directed toward the object side, a cemented lens of the biconcave lens L22 and the biconvex lens L23, and a negative lens having a concave surface directed toward the object side.
- the third lens group G3 includes, in order from the object side along the optical axis, a biconvex lens L31, a cemented lens of the biconvex lens L32 and a negative meniscus lens L33 having a concave surface on the object side, and a negative lens having a convex surface on the object side. It has a meniscus lens L34.
- the fourth lens group G4 includes, in order from the object side along the optical axis, a positive meniscus lens L41 having a convex surface facing the object side, and a cemented lens of a biconcave lens L42 and a positive meniscus lens L43 having a convex surface facing the object side. Have.
- the fifth lens group G5 includes, in order from the object side along the optical axis, a positive meniscus lens L51 having a convex surface directed toward the object side, and a cemented lens of a negative meniscus lens L52 having a convex surface directed toward the object side and a biconvex lens L53.
- the sixth lens group G6 includes a cemented lens of a biconcave lens L61 and a biconvex lens L62 in order from the object side along the optical axis.
- variable magnification optical system ZL4 In the variable magnification optical system ZL4 according to the fourth example having such a configuration, the distance between the first lens group G1 and the second lens group G2 is increased upon zooming from the wide-angle end state to the telephoto end state.
- the distance between the second lens group G2 and the third lens group G3 decreases, the distance between the third lens group G3 and the fourth lens group G4 changes, and the distance between the fourth lens group G4 and the fifth lens group G5.
- Each lens group moves so that the distance between the fifth lens group G5 and the sixth lens group G6 increases.
- the first lens group G1 is fixed with respect to the image plane I in the optical axis direction at the time of zooming from the wide-angle end state to the telephoto end state.
- the aperture stop S is disposed between the fourth lens group G4 and the fifth lens group G5, and moves together with the fourth lens group G4 upon zooming from the wide-angle end state to the telephoto end state.
- variable magnification optical system ZL4 the negative meniscus lens L34 among the lenses constituting the third lens group G3 is arranged from the object side when focusing from an infinite object point to a short distance object point. Move on the optical axis toward the image side.
- the cemented lens of the lens L41 and the lenses L42 and L43 in the fourth lens group G4 is used as an anti-vibration lens group, and the anti-vibration lens group is used as an optical axis.
- image plane correction at the time of occurrence of blurring is performed.
- the shake correction coefficient K is ⁇ 0.770 and the focal length is 81.6 (mm). Therefore, the image stabilizing lens for correcting the rotational shake of 0.350 ° is used.
- the amount of movement of the group is -0.676 (mm).
- the shake correction coefficient K is ⁇ 1.253, and the focal length is 392 (mm), so that the image stabilization for correcting the rotation shake of 0.160 ° is performed.
- the moving amount of the lens group is ⁇ 0.911 (mm).
- Table 4 below lists values of various specifications of the variable magnification optical system ZL4 according to the fourth example.
- the surface numbers 1 to 34 shown in Table 4 correspond to the surfaces 1 to 34 shown in FIG.
- (lens group data) indicates the start surfaces and focal lengths of the first to sixth lens groups G1 to G6.
- the focal length of the third lens group G3 indicates the value at the time of focusing on infinity.
- FIG. 14A, 14B, and 14C are aberration diagrams in the wide-angle end state of the variable magnification optical system according to the fourth example.
- FIG. 14A shows various aberrations when focusing on infinity
- FIG. 14B shows focusing on infinity
- 15A and 15B are aberration diagrams in the intermediate focal length state of the zoom optical system according to the fourth example.
- FIG. 15A shows various aberrations at the time of focusing on infinity, and FIG.
- FIG. 16A, 16B, and 16C are aberration diagrams in the telephoto end state of the variable magnification optical system according to the fourth example.
- FIG. 16A shows various aberrations at the time of focusing on infinity
- variable magnification optical system ZL having the 5-group and 6-group configurations is shown, but the above-described configuration conditions and the like can be applied to other group configurations such as the 7-group and 8-group configurations.
- a configuration in which a lens or a lens group is added to the most object side, or a configuration in which a lens or a lens group is added to the most image side may be used.
- the lens group is separated depending on whether or not it moves so as to have a component substantially orthogonal to the optical axis, or a portion having at least one lens separated by an air interval that changes at the time of zooming or focusing. The portion having at least one lens is shown.
- a focusing lens group that performs focusing from an infinite object point to a short distance object point by moving a single lens group, a plurality of lens groups, or a partial lens group in the optical axis direction may be used.
- the focusing lens group can be applied to autofocus, and is also suitable for driving a motor for autofocus (such as an ultrasonic motor).
- a motor for autofocus such as an ultrasonic motor
- the lens group or the partial lens group is moved so as to have a component in a direction orthogonal to the optical axis, or is rotated (swayed) in the in-plane direction including the optical axis to reduce image blur caused by camera shake.
- a vibration-proof lens group to be corrected may be used.
- the lens surface may be formed as a spherical surface as in the variable magnification optical system ZL shown in the present embodiment, a part thereof may include a flat surface, or may be formed as an aspherical surface.
- the aspherical surface is an aspherical surface by grinding, a glass mold aspherical surface made of glass with an aspherical shape, and a composite type in which resin is formed on the glass surface in an aspherical shape Any aspherical surface may be used.
- 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 S is preferably arranged in the vicinity of the fourth lens group G4 (preferably on the image side) or in the vicinity of the third lens group G3. That role may be substituted.
- each lens surface may be provided with an antireflection film having a high transmittance in a wide wavelength range in order to reduce flare and ghost and achieve high contrast optical performance.
- the variable magnification optical system ZL has a variable magnification ratio of about 4-6.
- the first lens group G1 preferably includes two or three positive lenses and one or two negative lenses.
- the first lens group G1 includes, in order from the object side, a negative lens, a positive lens, a negative lens, a positive lens, or a negative lens, a positive lens, a positive lens, a negative lens, and a positive lens.
- a negative lens a positive lens, a negative lens, or a negative lens
- Each lens may be a single lens or may be bonded to form a cemented lens.
- the second lens group G2 has one or two positive lenses and three negative lenses.
- the second lens group G2 includes, in order from the object side, a negative lens, a negative lens, a positive lens, a negative lens, or a positive lens, a negative lens, a negative lens, a positive lens, and a negative lens. It is preferable to arrange a lens.
- Each lens may be a single lens or may be bonded to form a cemented lens.
- the third lens group G3 has two or three positive lenses and one or two negative lenses.
- a positive lens, a positive lens, a negative lens, and a negative lens, or a positive lens, a positive lens, and a negative lens are arranged in order from the object side.
- Each lens may be a single lens or may be bonded to form a cemented lens.
- the fourth lens group G4 has one or two positive lenses and one or two negative lenses.
- a positive lens, a negative lens, and a positive lens, or a positive lens and a negative lens are arranged in order from the object side.
- Each lens may be a single lens or may be bonded to form a cemented lens.
- the fifth lens group G5 has three or four positive lenses and two or three negative lenses.
- a positive lens, a negative lens, a positive lens, a negative lens, and a positive lens are arranged in this order from the object side.
- Each lens may be a single lens or may be bonded to form a cemented lens.
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Abstract
Description
0.010 < f1/f3 < 1.410 (1)
を満足することを特徴とする変倍光学系を提供する。
0.160 < f2/f4 < 0.370 (2)
を満足することが好ましい。
0.370 < f3/(-f4) < 0.620 (3)
を満足することが好ましい。
1.140 < (-f4)/f5 < 1.540 (4)
を満足することが好ましい。
0.010 < f1/f3 < 1.410 (1)
を満足するように配置することを特徴とする変倍光学系の製造方法を提供する。
0.010 < f1/f3 < 1.410 (1)
0.160 < f2/f4 < 0.370 (2)
0.370 < f3/(-f4) < 0.620 (3)
1.140 < (-f4)/f5 < 1.540 (4)
以下、本願の各実施例を、図面に基づいて説明する。なお、図1、図5、図9、および図13は、各実施例に係る変倍光学系ZL(ZL1~ZL4)の構成を示す断面図である。また、これらの変倍光学系ZL1~ZL4の断面図の下部には、広角端状態(W)から望遠端状態(T)に変倍する際の各レンズ群G1~G5(またはG6)の光軸に沿った移動方向が矢印で示されている(第1レンズ群G1は、変倍に際して像面に対して光軸方向に固定されている)。
図1は、第1実施例に係る変倍光学系ZL1のレンズ構成図およびズーム軌跡を示したものである。図1に示すように、第1実施例に係る変倍光学系ZL1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、負の屈折力を有する第4レンズ群G4と、正の屈折力を有する第5レンズ群G5とを有する。
(全体諸元)
W M T
f= 81.6 200.0 392.0
FNO= 4.6 4.9 5.8
TL= 300.0 300.0 300.0
2ω= 30.3 12.1 6.2
Φ= 25.2 28.0 32.0
(レンズデータ)
m r d nd νd
1 90.3626 3.3 1.79952 42.1
2 64.4126 13.7 1.49782 82.6
3 -323.4131 0.2
4 90.0991 3.0 1.84666 23.8
5 66.7633 6.9 1.59319 67.9
6 221.4083 D1
7 289.4442 2.0 1.77250 49.6
8 54.5420 4.4
9 -85.1025 2.0 1.75500 52.3
10 56.3666 5.6 1.80809 22.7
11 -157.5631 1.9
12 -63.3615 2.0 1.81600 46.6
13 -303.6297 D2
14 136.0550 4.7 1.72000 43.6
15 -119.9075 0.2
16 128.5528 7.0 1.60300 65.4
17 -76.6023 2.0 1.84666 23.8
18 -1425.8055 0.4
19 53.8121 5.0 1.59319 67.9
20 43.5920 D3
21 90.8618 2.0 1.83400 37.2
22 94.8728 2.6
23 -116.9535 1.8 1.77250 49.6
24 287.3742 3.5 1.84666 23.8
25 844.7596 3.3
26 0.0000 D4 開口絞りS
27 33.3813 4.9 1.80400 46.6
28 70.0018 13.3
29 65.7975 1.3 1.68893 31.2
30 18.9846 14.0 1.48749 70.3
31 -54.3746 5.2
32 -30.2199 1.5 1.81600 46.6
33 39.6615 4.5 1.80518 25.5
34 -96.7465 BF
(レンズ群データ)
レンズ群 ST 焦点距離
G1 1 114.4955
G2 7 -39.0000
G3 14 82.4344
G4 21 -146.9238
G5 27 110.8862
(可変間隔データ)
INF
W M T
f= 81.6 200.0 392.0
D0= ∞ ∞ ∞
D1= 2.3136 25.2531 34.1938
D2= 74.5443 34.7297 2.0000
D3= 15.6961 31.1663 29.4377
D4= 25.6497 10.4793 2.0000
BF= 59.4758 76.0510 110.0483
CLD
W M T
β= -0.04 -0.10 -0.17
D0= 1500 1500 1500
D1= 2.3136 25.2531 34.1938
D2= 86.9877 52.0579 27.6034
D3= 3.2527 13.8381 3.8343
D4= 25.6497 10.4793 2.0000
BF= 59.4758 76.0510 110.0483
(条件式対応値)
(1)f1/f3=1.389
(2)f2/f4=0.265
(3)f3/(-f4)=0.561
(4)(-f4)/f5=1.325
図5は、第2実施例に係る変倍光学系ZL2のレンズ構成図およびズーム軌跡を示したものである。この図5に示すように、第2実施例に係る変倍光学系ZL2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、負の屈折力を有する第4レンズ群G4と、正の屈折力を有する第5レンズ群G5とを有する。
(全体諸元)
W M T
f= 81.6 200.0 392.0
FNO= 4.6 4.8 5.8
TL= 300.0 300.0 300.0
2ω= 30.6 12.1 6.2
Φ= 28.6 32.0 35.2
(レンズデータ)
m r d nd νd
1 88.3109 3.3 1.79952 42.1
2 64.9396 13.3 1.49782 82.6
3 -396.6101 0.1
4 91.4065 3.0 1.84666 23.8
5 67.3855 6.9 1.59319 67.9
6 226.2386 D1
7 289.4312 2.0 1.77250 49.6
8 59.5668 4.4
9 -109.2759 2.0 1.75500 52.3
10 53.9405 5.4 1.80809 22.7
11 -193.3459 1.9
12 -68.1720 2.0 1.81600 46.6
13 3004.7073 D2
14 272.5667 4.7 1.72000 43.6
15 -97.9868 0.2
16 349.4350 7.0 1.60300 65.4
17 -70.7966 2.0 1.84666 23.8
18 -296.8721 D3
19 -100.9730 2.0 1.83400 37.2
20 -66.4844 1.8 1.77250 49.6
21 -319.2856 3.0
22 0.0000 D4 開口絞りS
23 33.4163 4.0 1.80400 46.6
24 69.6041 15.3
25 87.7229 1.3 1.68893 31.2
26 19.0435 14.0 1.48749 70.3
27 -54.4058 5.3
28 -31.0254 1.5 1.81600 46.6
29 37.8341 4.5 1.80518 25.5
30 -92.5488 BF
(レンズ群データ)
レンズ群 ST 焦点距離
G1 1 115.4964
G2 7 -39.0000
G3 14 90.3722
G4 19 -205.4648
G5 23 139.0895
(可変間隔データ)
INF
W M T
f 81.6 200.0 392.0
D0 ∞ ∞ ∞
D1 4.9581 26.3218 34.9568
D2 80.4033 37.3598 2.0000
D3 15.8892 34.3003 30.3362
D4 21.3886 7.0919 2.0000
BF 66.4915 84.0567 119.8377
CLD
W M T
β -0.04 -0.10 -0.17
D0 1500 1500 1500
D1 4.9581 26.3218 34.9568
D2 92.8179 55.0105 28.4573
D3 3.4746 16.6496 3.8789
D4 21.3886 7.0919 2.0000
BF 66.4916 84.0571 119.8389
(条件式対応値)
(1)f1/f3=1.278
(2)f2/f4=0.190
(3)f3/(-f4)=0.440
(4)(-f4)/f5=1.477
図9は、第3実施例に係る変倍光学系ZL3のレンズ構成図およびズーム軌跡を示したものである。図9に示すように、第3実施例に係る変倍光学系ZL3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、負の屈折力を有する第4レンズ群G4と、正の屈折力を有する第5レンズ群G5とを有する。
(全体諸元)
W M T
f= 81.6 200.0 392.0
FNO= 4.6 4.8 5.8
TL= 300.0 300.0 300.0
2ω= 30.6 12.1 6.2
Φ= 28.6 32.0 35.2
(レンズデータ)
m r d nd νd
1 88.8502 3.3 1.79952 42.1
2 65.7614 10.3 1.49782 82.6
3 461.9657 0.1
4 219.2034 5.0 1.49782 82.6
5 -682.7306 0.1
6 100.7146 3.0 1.84666 23.8
7 72.6863 6.3 1.59319 67.9
8 223.1238 D1
9 454.6325 2.0 1.77250 49.6
10 62.1215 4.4
11 -116.1137 2.0 1.75500 52.3
12 54.3078 5.3 1.80809 22.7
13 -199.2381 1.9
14 -68.8551 2.0 1.81600 46.6
15 4047.5114 D2
16 265.9300 4.7 1.72000 43.6
17 -98.1908 0.2
18 496.8226 7.0 1.60300 65.4
19 -68.7179 2.0 1.84666 23.8
20 -256.9321 D3
21 -97.1763 2.0 1.83400 37.2
22 -66.4692 1.8 1.77250 49.6
23 -236.7733 3.0
24 0.0000 D4 開口絞りS
25 33.0102 4.0 1.80400 46.6
26 66.4615 15.4
27 89.2303 1.3 1.68893 31.2
28 18.9449 14.0 1.48749 70.3
29 -52.5904 5.2
30 -30.8360 1.5 1.81600 46.6
31 36.0629 4.7 1.80518 25.5
32 -97.4474 BF
(レンズ群データ)
レンズ群 ST 焦点距離
G1 1 115.3571
G2 9 -39.0000
G3 16 91.5440
G4 21 -230.9495
G5 25 151.0655
(可変間隔データ)
INF
W M T
f 81.6 200.0 392.0
D0 ∞ ∞ ∞
D1 5.0373 26.0405 34.5903
D2 81.4597 37.7472 2.0000
D3 15.7565 34.4194 30.5155
D4 20.3376 6.4059 2.0000
BF 65.0107 82.9888 118.4960
CLD
W M T
β -0.04 -0.10 -0.17
D0 1500 1500 1500
D1 5.0373 26.0405 34.5903
D2 93.9050 55.4470 28.6351
D3 3.3112 16.7195 3.8804
D4 20.3376 6.4059 2.0000
BF 65.0107 82.9888 118.4960
(条件式対応値)
(1)f1/f3=1.260
(2)f2/f4=0.169
(3)f3/(-f4)=0.396
(4)(-f4)/f5=1.529
図13は、第4実施例に係る変倍光学系ZL4のレンズ構成図およびズーム軌跡を示したものである。図13に示すように、第4実施例に係る変倍光学系ZL4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、負の屈折力を有する第4レンズ群G4と、正の屈折力を有する第5レンズ群G5と、負の屈折力を有する第6レンズ群G6とを有する。
(全体諸元)
W M T
f= 81.6 200.0 392.0
FNO= 4.5 4.9 5.9
TL= 300.0 300.0 300.0
2ω= 30.3 12.1 6.2
Φ= 25.2 28.0 32.0
(レンズデータ)
m r d nd νd
1 90.3626 3.3 1.79952 42.1
2 64.4126 13.7 1.49782 82.6
3 -323.4131 0.2
4 90.0991 3.0 1.84666 23.8
5 66.7633 6.9 1.59319 67.9
6 221.4083 D1
7 289.4442 2.0 1.77250 49.6
8 54.5420 4.4
9 -85.1025 2.0 1.75500 52.3
10 56.3666 5.6 1.80809 22.7
11 -157.5631 1.9
12 -63.3615 2.0 1.81600 46.6
13 -303.6297 D2
14 136.0550 4.7 1.72000 43.6
15 -119.9075 0.2
16 128.5528 7.0 1.60300 65.4
17 -76.6023 2.0 1.84666 23.8
18 -1425.8055 D3
19 53.8121 5.0 1.59319 67.9
20 43.5920 D4
21 90.8618 2.0 1.83400 37.2
22 94.8728 2.6
23 -116.9535 1.8 1.77250 49.6
24 287.3742 3.5 1.84666 23.8
25 844.7596 3.3
26 0.0000 D5 開口絞りS
27 33.3813 4.9 1.80400 46.6
28 70.0018 13.3
29 65.7975 1.3 1.68893 31.2
30 18.9846 14.0 1.48749 70.3
31 -54.3746 D6
32 -30.2199 1.5 1.81600 46.6
33 39.6615 4.5 1.80518 25.5
34 -96.7465 BF
(レンズ群データ)
レンズ群 ST 焦点距離
G1 1 114.4955
G2 7 -39.0000
G3 14 82.4344
G4 21 -146.92377
G5 27 52.83669
G6 32 -54.94003
(可変間隔データ)
INF
W M T
f 81.6 200.0 392.0
D0 ∞ ∞ ∞
D1 2.3136 25.2531 34.1938
D2 74.5443 34.7297 2.0000
D3 0.4000 0.4000 0.4000
D4 18.5925 31.1663 25.7084
D5 24.7359 10.4793 3.0850
D6 5.1 5.2 5.3
BF 57.3932 76.0510 112.7924
CLD
W M T
β -0.04 -0.10 -0.17
D0 1500 1500 1500
D1 2.3136 25.2531 34.1938
D2 86.9877 52.0579 27.6034
D3 0.7044 1.8063 4.4070
D4 18.2881 29.7599 21.7014
D5 24.7359 10.4793 3.0850
D6 5.1 5.2 5.3
BF 57.3932 76.0510 112.7924
(条件式対応値)
(1)f1/f3=1.389
(2)f2/f4=0.265
(3)f3/(-f4)=0.561
(4)(-f4)/f5=2.780
本実施形態では、5群および6群構成の変倍光学系ZLを示しているが、以上の構成条件等は、7群、8群構成等の他の群構成にも適用可能である。また、最も物体側にレンズまたはレンズ群を追加した構成や、最も像側にレンズまたはレンズ群を追加した構成でも構わない。また、レンズ群とは、変倍時、または合焦時に変化する空気間隔で分離された少なくとも1枚のレンズを有する部分、若しくは光軸と略直交成分を持つように移動するか否かで分離された少なくとも1枚のレンズを有する部分を示す。
また、本実施形態の変倍光学系ZLは、第1レンズ群G1が正レンズを2つ又は3つと、負レンズを1つ又は2つ有するのが好ましい。また、第1レンズ群G1は、物体側から順に、負レンズと、正レンズと、負レンズと、正レンズとを、または負レンズと、正レンズと、正レンズと、負レンズと、正レンズとを配置するのが好ましい。なお、各レンズは、単レンズとしてもよく、貼り合わせて接合レンズとしてもよい。
Claims (9)
- 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、負の屈折力を有する第4レンズ群と、正の屈折力を有する第5レンズ群と、を有し、
変倍に際し、前記第1レンズ群は、像面に対して光軸方向に固定されており、
合焦に際し、前記第3レンズ群の少なくとも一部は、光軸に沿って移動し、
以下の条件式を満足することを特徴とする変倍光学系。
0.010 < f1/f3 < 1.410
ただし、
f1:前記第1レンズ群の焦点距離
f3:前記第3レンズ群の焦点距離 - 以下の条件式を満足することを特徴とする請求項1に記載の変倍光学系。
0.160 < f2/f4 < 0.370
ただし、
f2:前記第2レンズ群の焦点距離
f4:前記第4レンズ群の焦点距離 - 以下の条件を満足することを特徴とする請求項1に記載の変倍光学系。
0.370 < f3/(-f4) < 0.620
ただし、
f3: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 - 以下の条件式を満足することを特徴とする請求項1記載の変倍光学系。
1.140 < (-f4)/f5 < 1.540
ただし、
f4:前記第4レンズ群の焦点距離
f5:前記第5レンズ群の焦点距離 - 前記第4レンズ群の少なくとも一部は、光軸と直交する方向の成分を含むように移動することを特徴とする請求項1記載の変倍光学系。
- 変倍に際し、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レンズ群と前記第5レンズ群との間隔が変化することを特徴とする請求項1記載の変倍光学系。
- 全てのレンズ面が球面で構成されていることを特徴とする請求項1記載の変倍光学系。
- 請求項1記載の変倍光学系を有することを特徴とする光学機器。
- 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、負の屈折力を有する第4レンズ群と、正の屈折力を有する第5レンズ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レンズ群を像面に対して光軸方向に固定されるように配置し、
合焦に際し、前記第3レンズ群の少なくとも一部を光軸に沿って移動するように配置し、
以下の条件式を満足するように配置することを特徴とする変倍光学系の製造方法。
0.010 < f1/f3 < 1.410
ただし、
f1:前記第1レンズ群の焦点距離
f3:前記第3レンズ群の焦点距離
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CN107272173B (zh) * | 2017-08-10 | 2019-11-15 | 福建福光股份有限公司 | 具有视场连续输出功能的强透雾高清变焦摄像镜头 |
CN107643591B (zh) * | 2017-11-01 | 2023-08-15 | 河南中光学集团有限公司 | 一种反衰减透雾可见光镜头及实现方法 |
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