WO2010004806A1 - ズームレンズ、これを有する光学機器及びズームレンズの製造方法 - Google Patents
ズームレンズ、これを有する光学機器及びズームレンズの製造方法 Download PDFInfo
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- WO2010004806A1 WO2010004806A1 PCT/JP2009/058862 JP2009058862W WO2010004806A1 WO 2010004806 A1 WO2010004806 A1 WO 2010004806A1 JP 2009058862 W JP2009058862 W JP 2009058862W WO 2010004806 A1 WO2010004806 A1 WO 2010004806A1
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- lens
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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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- 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 zoom lens, an optical apparatus having the zoom lens, and a method for manufacturing the zoom lens.
- zoom lenses Due to recent advances in optical design technology and manufacturing technology, zoom lenses have been reduced in size and increased in magnification. However, the increase in the focal length at the telephoto end due to high zooming has made the camera shake problem more prominent. Regarding this camera shake, zoom lenses having various camera shake correction functions have been proposed (see, for example, Patent Document 1).
- the conventional zoom lens having the camera shake correction function has a problem that the optical performance is significantly deteriorated when zooming is performed while the camera shake correction function is provided.
- the present invention has been made in view of such a problem, and performs image shift by an optical system that can move so as to have a component orthogonal to the optical axis, enables camera shake correction, and achieves high zooming.
- An object of the present invention is to provide a zoom lens in which an appropriate amount of movement at the time of zooming is set so as to reduce the deterioration of performance while achieving it, an optical apparatus having the zoom lens, and a method of manufacturing the zoom lens.
- the zoom lens of the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a positive refraction arranged in order from the object side.
- a third lens group having a power and a fourth lens group having a positive refractive power are configured such that the distance between the lens groups changes upon zooming from the wide-angle end state to the telephoto end state.
- the third lens group includes a positive lens group having a positive refractive power and a negative lens group having a negative refractive power arranged in order from the object side, and the negative lens group is orthogonal to the optical axis.
- the first lens group is moved by X1 when zooming from the wide-angle end state to the telephoto end state, and the focal length of the entire lens system in the wide-angle end state.
- Another zoom lens according to the present invention includes 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, which are arranged in order from the object side. It has a lens group and a fourth lens group having a positive refractive power, and is configured such that the distance between the lens groups changes upon zooming from the wide-angle end state to the telephoto end state. Further, the third lens group includes a positive lens group having a positive refractive power and a negative lens group having a negative refractive power arranged in order from the object side, and the negative lens group is orthogonal to the optical axis.
- the focal length of the first lens unit is f1 and the focal length of the entire lens system in the wide-angle end state is fw, the following condition 3.5 ⁇ f1 / fw ⁇ 5.0 is satisfied. preferable.
- the negative lens group preferably comprises a cemented lens of a biconcave negative lens and a positive lens.
- the negative lens group preferably has an aspherical surface.
- the negative lens group preferably has a negative lens, and the negative lens preferably has an aspherical surface.
- the negative lens group includes a cemented lens of a biconcave negative lens and a positive meniscus lens having a convex surface facing the object side arranged in order from the object side, or a convex surface arranged in order from the object side. It is preferable to consist of a cemented lens of a directed positive meniscus lens and a biconcave negative lens.
- the fourth lens group includes a positive lens disposed closest to the object side and at least one cemented lens.
- the first lens group, the third lens group, and the fourth lens group move in the object direction upon zooming from the wide-angle end state to the telephoto end state.
- the distance between the first lens group and the second lens group increases, and the distance between the second lens group and the third lens group decreases.
- the distance between the third lens group and the fourth lens group is preferably changed.
- an air gap between the third lens group and the fourth lens group in the wide-angle end state is larger than an air gap between the third lens group and the fourth lens group in the telephoto end state.
- the optical apparatus of the present invention has the zoom lens.
- the zoom lens manufacturing method includes 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 in a lens barrel.
- the third lens group includes a positive lens group having a positive refractive power and a negative lens group having a negative refractive power arranged in this order from the object side, and the negative lens group is orthogonal to the optical axis. And assembling to move with a directional component.
- the focal length of the second lens group is f2 and the focal length of the third lens group is f3, the following formula is 0.38 ⁇ ( ⁇ f2) / f3 ⁇ 0.50. It is preferable to satisfy the conditions.
- Another method of manufacturing a zoom lens according to the present invention includes 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,
- the fourth lens group having a positive refractive power is arranged in this order from the object side, and the assembling step is performed so that the distance between the lens groups changes upon zooming from the wide-angle end state to the telephoto end state.
- the third lens group includes a positive lens group having a positive refractive power and a negative lens group having a negative refractive power arranged in this order from the object side, and the negative lens group is orthogonal to the optical axis. And assembling it so as to be moved.
- the focal length of the second lens group is f2 and the focal length of the third lens group is f3, the following condition 0.38 ⁇ ( ⁇ f2) / f3 ⁇ 0.50 is satisfied.
- the zoom lens has the various configurations described above.
- image shift is performed by an optical system that can move so as to have a component orthogonal to the optical axis, image stabilization is possible, and it is appropriate to reduce performance deterioration while achieving high zooming. It is possible to provide a zoom lens in which a moving amount at the time of zooming is set, an optical apparatus having the zoom lens, and a zooming method.
- FIG. 1 is a configuration diagram of a zoom lens according to a first example.
- FIG. (A) and (b) are diagrams showing various aberrations at the time of focusing on infinity in the wide-angle end state of the zoom lens according to the first example and when shake correction is performed for 0.59 ° rotational blur. It is a coma aberration diagram.
- FIG. 5 is a diagram illustrating various aberrations when the zoom lens according to Example 1 is in focus at infinity in the intermediate focal length state.
- FIGS. 9A and 9B are diagrams showing various aberrations when focusing at infinity in the telephoto end state of the zoom lens according to the first example, and when the shake correction is performed for a rotational shake of 0.19 °.
- FIGS. It is a coma aberration diagram.
- FIG. 12 is a diagram illustrating various aberrations when the zoom lens according to Example 2 is focused at infinity in the intermediate focal length state.
- FIGS. 9A and 9B are diagrams showing various aberrations at the time of focusing on infinity in the telephoto end state of the zoom lens according to the second example, and are obtained when shake correction is performed for a rotational shake of 0.19 °. It is a coma aberration diagram. It is a schematic sectional drawing of the digital single-lens reflex camera which has the zoom lens of the said structure. It is a flowchart which shows the manufacturing method of the said zoom lens.
- the zoom lens according to the present embodiment includes a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a positive lens arranged in order from the object side.
- the first lens group G1 and the second lens group at the time of zooming from the wide-angle end state to the telephoto end state have a third lens group G3 having a refractive power of 4 and a fourth lens group G4 having a positive refractive power.
- the third lens group G3 is suitable for incorporating an anti-vibration mechanism because the lens diameter can be reduced as compared with other lens groups. Therefore, even if an anti-vibration mechanism is incorporated in the lens barrel, an increase in the size of the lens barrel can be avoided. Further, the third lens group G3 includes a thirty-first lens group G31 having a positive refractive power and a thirty-second lens group G32 having a negative refractive power, and the thirty-second lens group G32 is used as an anti-vibration lens group. By using it, it is possible to reduce the size of the vibration isolation mechanism and reduce the mass of the vibration isolation lens group.
- the third lens group G3 is set to an appropriate refractive power distribution, the result obtained when the thirty-second lens group G32, which is a vibration-proof lens group, is moved so as to have a component perpendicular to the optical axis. Degradation of image performance can be reduced.
- the amount of movement of the first lens group G1 when zooming from the wide-angle end state to the telephoto end state is X1
- the focal length of the zoom lens in the wide-angle end state is X1.
- fw the condition of the following formula (1) is satisfied.
- the sign of the movement amount X1 is positive when the position of the first lens group G1 in the telephoto end state is located in the object direction from the origin with the position on the optical axis in the wide-angle end state of the first lens group G1 as the origin.
- the conditional expression (1) is a conditional expression that prescribes an appropriate amount of movement X1 of the first lens group G1 upon zooming from the wide-angle end state to the telephoto end state in order to secure a high magnification. If the upper limit of conditional expression (1) is exceeded, the amount of movement of the first lens group G1 with respect to zooming increases, and the amount of light in the telephoto end state decreases. As a result, the overall length and diameter of the zoom lens increase, making it difficult to put it into practical use. Moreover, since the fluctuation
- conditional expression (1) On the other hand, if the lower limit value of conditional expression (1) is not reached, the amount of movement of the first lens group G1 with respect to zooming will decrease too much, and the power of the first lens group G1 will be made relatively strong, or another lens will be used. A zooming effect in the lens group is required, and as a result, the image plane variation due to zooming and the spherical aberration in the telephoto end state are significantly deteriorated.
- the upper limit of conditional expression (1) it is preferable to set the upper limit of conditional expression (1) to 5.0. In order to make the effect of the present embodiment more reliable, it is preferable to set the upper limit value of conditional expression (1) to 3.5. In order to further secure the effect of the present embodiment, it is preferable to set the upper limit of conditional expression (1) to 3.0. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (1) to 2.8.
- the focal length of the second lens group G2 is f2
- the focal length of the third lens group G3 is f3
- the conditional expression (2) is a conditional expression that defines an appropriate ratio of the focal length f2 of the second lens group G2 to the focal length f3 of the third lens group G3. Exceeding the upper limit value of conditional expression (2) is not preferable because it becomes difficult to simultaneously correct the coma aberration in the wide-angle end state, the spherical aberration in the telephoto end state, and the variation in field curvature during camera shake correction. On the other hand, if the lower limit value of conditional expression (2) is not reached, the refractive power of the second lens group G2 becomes relatively strong, and astigmatism and field curvature in the wide-angle end state are significantly deteriorated.
- conditional expression (2) In order to secure the effect of the present embodiment, it is preferable to set the upper limit value of conditional expression (2) to 0.48. In order to make the effect of the present embodiment more certain, it is preferable to set the upper limit value of conditional expression (2) to 0.45. In order to secure the effect of the present embodiment, it is preferable to set the lower limit of conditional expression (2) to 0.40.
- the focal length of the second lens group G2 is set to f2 and the focal length of the third lens group G3 is set to f3 based on the zoom lens configuration including the first to fourth lens groups. Is configured to satisfy the condition of the conditional expression (2).
- the upper limit value and lower limit value of conditional expression (2) are the same as described above.
- the focal length of the first lens group G1 is f1
- the focal length of the zoom lens in the wide-angle end state is fw
- the conditional expression (3) is a conditional expression that defines an appropriate range of the focal length f1 of the first lens group G1 suitable for securing the back focus and securing the imaging performance. If the upper limit value of the conditional expression (3) is exceeded, the total length and diameter of the zoom lens will increase, making it difficult to put it into practical use. Further, it is not preferable because the variation in field curvature increases. On the other hand, if the lower limit value of the conditional expression (3) is not reached, the back focus is shortened, the imaging performance in the telephoto end state is deteriorated, particularly the spherical aberration is deteriorated.
- the thirty-second lens group G32 is preferably composed of a cemented lens composed of a biconcave negative lens and a positive lens (a cemented lens composed of the lens L321 and the lens L322 in FIG. 1). As a result, it is possible to reduce fluctuations in image plane chromatic aberration when the thirty-second lens group G32 is decentered for image stabilization.
- the thirty-second lens group G32 preferably has an aspheric surface (surface number 24 in FIG. 1).
- the negative lens (lens L322 in FIG. 1) included in the thirty-second lens group G32 has an aspherical surface. Accordingly, it is possible to reduce the fluctuation of the decentration coma aberration when the thirty-second lens group G32 is decentered for image stabilization.
- the thirty-second lens group G32 is preferably composed of a cemented lens of a biconcave negative lens and a positive lens (see FIG. 5).
- the thirty-second lens group G32 is arranged in order from the object side, a cemented lens of a biconcave negative lens and a positive meniscus lens having a convex surface facing the object side, or arranged in order from the object side. It is preferably composed of a cemented lens of a positive meniscus lens having a convex surface facing the image surface side and a biconcave lens.
- the fourth lens group G4 includes a positive lens (lens L41 in FIG. 1) arranged on the most object side and at least one cemented lens (lens L43 and lens L44 in FIG. 1). Lens).
- a positive lens lens (lens L41 in FIG. 1) arranged on the most object side and at least one cemented lens (lens L43 and lens L44 in FIG. 1). Lens).
- the divergent light beam from the third lens group G3 can be quickly converged, the enlargement of the fourth lens group G4 can be reduced, and fluctuations in coma aberration in the wide-angle end state can be reduced.
- the most object side lens surface (surface number 25 in FIG. 1) in the fourth lens group G4 is an aspherical surface, coma aberration can be reduced and image plane variation due to zooming can be corrected well. it can. As a result, it is possible to further reduce performance degradation when the 32nd lens group is decentered for image stabilization.
- the first lens group G1, the third lens group G3, and the fourth lens group G4 move in the object direction when zooming from the wide-angle end state to the telephoto end state. Thereby, zooming efficiency can be improved.
- the air gap between the third lens group G3 and the fourth lens group G4 in the wide-angle end state is larger than the air gap between the third lens group G3 and the fourth lens group G4 in the telephoto end state. It is preferable. As a result, image plane fluctuations due to zooming, particularly waviness at the intermediate position can be reduced.
- FIG. 9 is a schematic cross-sectional view of a digital single-lens reflex camera CAM (optical device) provided with the zoom lens having the above configuration as a photographing lens 1.
- a digital single-lens reflex camera CAM optical device
- FIG. 9 shows that light from an object (subject) (not shown) is collected by the photographing lens 1 and focused 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 1 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 photograph an object (subject) with the camera CAM.
- the camera CAM described in FIG. 9 may be one that holds the photographing lens 1 in a detachable manner or may be molded integrally with the photographing lens 1.
- the zoom lens of the present embodiment can ensure a sufficiently long back focus, and the camera CAM may be a so-called single-lens reflex camera or a camera without a quick return mirror or the like.
- Tables 1 and 2 are shown below, but these are tables of specifications in the first and second examples.
- f represents the focal length of the zoom lens
- FNO represents the F number
- 2 ⁇ represents the angle of view.
- the surface number is the order of the lens surfaces from the object side along the direction in which the light beam travels
- r is the radius of curvature of each lens surface
- d is the next optical surface from each optical surface (or The surface interval, which is the distance on the optical axis to the image plane)
- ⁇ d is the Abbe number for the d-line
- nd is the refractive index for the d-line (wavelength 587.6 nm).
- mm is generally used as the focal length f, radius of curvature r, surface interval d, and other length units.
- the unit is not limited to “mm”, and other appropriate units can be used.
- FIG. 1 is a lens configuration diagram of Example 1, and shows a wide-angle end state (W), an intermediate focal length state (M), and a telephoto end state (T) in order from the top in the drawing.
- the zoom lens according to the first example includes a first lens group G1 having a positive refractive power and a second lens having a negative refractive power, which are arranged in order from the object side along the optical axis. It has a lens group G2, a third lens group G3 having a positive refractive power, and a fourth lens group G4 having a positive refractive power.
- the first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side.
- the second lens group G2 includes a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a negative meniscus having a concave surface directed toward the object side. And a lens L24.
- the negative meniscus lens L21 located closest to the object side of the second lens group G2 is an aspheric lens in which an aspheric surface is formed on the object side lens surface.
- the third lens group G3 includes a thirty-first lens group G31 having a positive refractive power and a thirty-second lens group G32 having a negative refractive power, which are arranged in order from the object side.
- Camera shake correction is performed by moving the lens so as to have a component perpendicular to the axis.
- the thirty-first lens group G31 includes a biconvex positive lens L311, a biconvex positive lens L312, and a cemented lens of a biconvex positive lens L313 and a biconcave negative lens L314 arranged in order from the object side.
- the thirty-second lens group G32 includes a cemented lens of a positive meniscus lens L321 and a biconcave negative lens L322, which are arranged in order from the object side and have a convex surface directed toward the image surface side.
- the biconcave negative lens L322 located closest to the image plane in the thirty-second lens group G32 is an aspheric lens having an aspheric lens surface on the image plane side.
- the fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, a negative lens L42 having a convex surface directed toward the object side, a biconvex positive lens L43, and a negative meniscus lens having a convex surface directed toward the image surface side. And a cemented lens with L44.
- the biconvex positive lens L41 located closest to the object side in the fourth lens group G4 is an aspheric lens having an aspheric lens surface on the object side.
- the air gap between the first lens group G1 and the second lens group G2 increases during zooming from the wide-angle end state to the telephoto end state
- the first lens group G1, the third lens group G3, and the third lens group G3 are arranged so that the air gap between the group G2 and the third lens group G3 is reduced and the air gap between the third lens group G3 and the fourth lens group G4 is reduced.
- the fourth lens group G4 moves in the object direction.
- the second lens group G2 once moves in the object direction and then moves in the image direction.
- the aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the 31st lens group G31 upon zooming from the wide-angle end state to the telephoto end state.
- the image stabilization coefficient is K.
- the moving lens group for shake correction may be moved by (f ⁇ tan ⁇ ) / K so as to have a component orthogonal to the optical axis.
- the image stabilization coefficient is 1.034 and the focal length is 28.80 (mm). Therefore, the thirty-second lens group G32 for correcting a rotational blur of 0.59 °. Is moved to 0.282 (mm).
- the movement amount of the group G32 is 0.432 (mm).
- Table 1 below lists the values of each specification of the zoom lens according to the first example.
- the surface numbers 1 to 31 in Table 1 correspond to the surfaces 1 to 31 shown in FIG.
- FIGS. 2A and 2B are diagrams illustrating various aberrations at the time of focusing on infinity in the wide-angle end state of the zoom lens according to the first example and blur correction for 0.59 ° rotational shake.
- FIG. FIG. 3 is a diagram illustrating various aberrations when the zoom lens according to Example 1 is focused at infinity in the intermediate focal length state.
- FIGS. 4A and 4B are diagrams illustrating various aberrations at the time of focusing on infinity in the telephoto end state of the zoom lens according to the first example and blur correction with respect to a rotational shake of 0.19 °.
- FNO represents an F number
- Y represents an image height (unit: mm).
- the spherical aberration diagram shows the F-number value corresponding to the maximum aperture
- the astigmatism diagram and the distortion diagram show the maximum image height
- the coma diagram shows the value of each image height.
- d indicates various aberrations with respect to the d-line (wavelength 587.6 nm)
- g indicates various aberrations with respect to the g-line (wavelength 435.8 nm)
- those not described indicate various aberrations with respect to the d-line.
- the solid line indicates the sagittal image plane
- the broken line indicates the meridional image plane.
- the first embodiment has a zoom ratio of about 10 times, an angle of view of 70 ° or more in the wide-angle end state, and each of the wide-angle end state to the telephoto end state. It can be seen that, in the focal length state, various aberrations are corrected well and the imaging performance is excellent.
- FIG. 5 is a lens configuration diagram of the second example, and shows a wide-angle end state (W), an intermediate focal length state (M), and a telephoto end state (T) in order from the top in the drawing.
- the zoom lens according to the second example includes a first lens group G1 having a positive refractive power, arranged in order from the object side along the optical axis, and arranged in order from the object side.
- 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 facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side.
- the second lens group G2 includes a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a biconcave negative lens L24 arranged in order from the object side.
- the negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens in which an aspheric surface is formed by providing a resin layer on the glass lens surface on the object side.
- the third lens group G3 includes a thirty-first lens group G31 having a positive refractive power and a thirty-second lens group G32 having a negative refractive power, which are arranged in order from the object side.
- Camera shake correction is performed by moving the lens so as to have a component perpendicular to the axis.
- the thirty-first lens group G31 includes a biconvex positive lens L311 and a cemented lens of a biconvex positive lens L312 and a biconcave negative lens L313 arranged in order from the object side.
- the thirty-second lens group G32 has a cemented lens composed of a biconcave negative lens L321 and a positive meniscus lens L322 having a convex surface directed toward the object side, which are arranged in order from the object side.
- the fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, a cemented lens of a biconvex positive lens L42 and a biconcave negative lens L43, and a positive lens L44 having a convex surface facing the image surface side.
- the biconvex positive lens L41 located closest to the object side in the fourth lens group G4 is an aspheric lens having an aspheric lens surface on the image plane side.
- the air gap between the first lens group G1 and the second lens group G2 increases during zooming from the wide-angle end state to the telephoto end state
- the first lens group G1, the third lens group G3, and the third lens group G3 are arranged so that the air gap between the group G2 and the third lens group G3 is reduced and the air gap between the third lens group G3 and the fourth lens group G4 is reduced.
- the fourth lens group G4 moves in the object direction.
- the second lens group G2 once moves in the object direction and then moves in the image direction.
- the aperture stop S is disposed between the second lens group G2 and the third lens group G3, and moves together with the 31st lens group G31 upon zooming from the wide-angle end state to the telephoto end state.
- the image stabilization coefficient K.
- the moving lens group for shake correction may be moved by (f ⁇ tan ⁇ ) / K so as to have a component orthogonal to the optical axis.
- the thirty-second lens group G32 for correcting a rotational blur of 0.59 °. Is moved to 0.370 (mm).
- the image stabilization coefficient is 1.638 and the focal length is 292.0 (mm). Therefore, the 32nd lens for correcting the rotation blur of 0.19 °.
- the movement amount of the group G32 is 0.583 (mm).
- Table 2 below lists the values of various specifications of the zoom lens according to the second example.
- the surface numbers 1 to 30 in Table 2 correspond to the surfaces 1 to 30 shown in FIG.
- FIGS. 6A and 6B are diagrams illustrating various aberrations at the time of focusing at infinity in the wide-angle end state of the zoom lens according to Example 2 and blur correction with respect to a rotational blur of 0.59 °.
- FIG. FIG. 7 is a diagram illustrating various aberrations when the zoom lens according to Example 2 is focused at infinity in the intermediate focal length state.
- FIGS. 8A and 8B are diagrams illustrating various aberrations at the time of focusing at infinity in the telephoto end state of the zoom lens according to the second example and blur correction for 0.19 ° rotational blur.
- the second embodiment has a zoom ratio of about 10 times, has an angle of view of 70 ° or more in the wide-angle end state, and has various angles from the wide-angle end state to the telephoto end state. It can be seen that, in the focal length state, various aberrations are corrected well and the imaging performance is excellent.
- a zoom lens having a four-group configuration is shown, but the present invention can also be applied to other group configurations such as a fifth group and a sixth group.
- group configurations such as a fifth group and a sixth group.
- a configuration in which a positive or negative lens group is added on the most object side a configuration in which a positive or negative lens group is added on the most image side, or a positive or negative value between the third group and the fourth group.
- the structure which added the lens group is mentioned.
- the focusing lens group may be a focusing lens group that performs focusing from an object at infinity to a near object by moving a single lens group, a plurality of lens groups, or a partial lens group in the optical axis direction.
- the focusing lens group can be applied to autofocus, and is also suitable for driving a motor for autofocus (such as an ultrasonic motor).
- the second lens group G2 is preferably a focusing lens group.
- the lens group or the partial lens group may be vibrated in a direction perpendicular to the optical axis so as to correct the image blur caused by camera shake.
- the thirty-second lens group G32 is an anti-vibration lens group.
- the lens surface may be formed of a spherical surface, a flat surface, or an aspheric surface. It is preferable that the lens surface is a spherical surface or a flat surface because lens processing and assembly adjustment are facilitated, and deterioration of optical performance due to errors in processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance.
- the lens surface is an aspheric surface
- the aspheric surface is an aspheric surface by grinding, a glass mold aspheric surface made of glass with an aspheric shape, or a composite type non-spherical surface made of resin on the glass surface. 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.
- the aperture stop S is preferably arranged in the vicinity of the third lens group G3, but the role may be substituted by a lens frame without providing a member as an aperture stop.
- 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 optical performance with high contrast.
- the zoom ratio is 5 to 18 times, and more preferably 8 to 12 times.
- the first lens group G1 has two positive lenses and one negative lens. Further, in the first lens group G1, it is preferable to dispose the lenses in order of negative positive / positive in order from the object side.
- the second lens group G2 has one positive lens and three negative lenses. In the second lens group G2, it is preferable to dispose lenses in order of negative, negative, positive and negative in order from the object side.
- the third lens group G3 has three positive lenses and two negative lenses.
- the third lens group G3 includes, in order from the object side, two positive lens components that are fixed during vibration isolation and one negative lens component that is movable during vibration isolation.
- the fourth lens group G4 has two positive lenses and one negative lens.
- the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens group G4 of this embodiment are assembled in a cylindrical barrel (step S1).
- the lens groups may be incorporated in the lens barrel one by one in the order along the optical axis, and a part or all of the lens groups are integrally held by the holding member and then the lens barrel member You may assemble to.
- the third to fifth lens groups may be held by one holding member and then incorporated into the lens barrel.
- step S3 various operations of the zoom lens are confirmed (step S3).
- a zooming operation in which at least a part of the lens group moves along the optical axis direction at the time of zooming, and a lens group that performs focusing from a long-distance object to a short-distance object along the optical axis direction.
- a camera shake correction operation in which at least part of the lens moves so as to have a component in a direction perpendicular to the optical axis.
- the distance between the first lens group G1 and the second lens group G2 increases during zooming from the wide-angle end state to the telephoto end state, and the second lens group G2 and the third lens are increased.
- Each lens group is moved so that the distance between the group G3 is decreased and the distance between the third lens group G3 and the fourth lens group G4 is decreased.
- the first lens group G1 moves toward the object side by an amount of movement X1 along the optical axis direction.
- the order of confirming the various operations is arbitrary.
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Abstract
Description
+A4×y4+A6×y6+A8×y8+A10×y10+A12×y12 …(a)
第1実施例について、図1~図4及び表1を用いて説明する。図1は、第1実施例のレンズ構成図であり、図中上方より順に、広角端状態(W)、中間焦点距離状態(M)、望遠端状態(T)をそれぞれ示している。図1に示すように、第1実施例に係るズームレンズは、光軸に沿って物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、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とを有している。
[全体諸元]
広角端状態 中間焦点距離状態 望遠端状態
f 28.80 ~ 100.0 ~ 292.0
FNO 3.61 ~ 5.16 ~ 5.87
2ω 76.3 ~ 23.6 ~ 8.2
[レンズデータ]
面番号 r d νd nd
1 138.374 2.00 32.3 1.85026
2 69.100 9.60 82.5 1.49782
3 -614.820 0.10
4 64.544 6.70 67.9 1.59319
5 381.843 D5
*6 142.335 1.00 42.7 1.83481
7 19.500 6.70
8 -38.699 1.00 49.6 1.77250
9 89.261 0.10
10 41.755 4.80 23.8 1.84666
11 -36.916 1.07
12 -25.585 1.00 46.6 1.80400
13 -739.100 D13
14 0.000 0.50 (絞りS)
15 45.269 3.30 46.6 1.81600
16 -253.290 0.10
17 46.089 3.20 65.5 1.60300
18 -580.837 0.10
19 32.415 4.90 82.6 1.49782
20 -45.043 1.00 23.8 1.84666
21 68.276 3.46
22 -104.946 2.95 25.7 1.78472
23 -28.646 1.00 49.5 1.74443
*24 55.403 D24
*25 39.560 4.40 61.2 1.58913
26 -37.069 0.10
27 83.477 1.50 25.7 1.78472
28 36.395 2.10
29 89.675 7.60 40.8 1.58144
30 -14.341 1.50 46.6 1.81600
31 -120.866 Bf
[非球面データ]
第6面
κ=-5.9513,A4=3.1708E-06,A6=-8.3003E-09,A8=6.2568E-11,
A10=-1.4653E-13,A12=2.7995E-16
第24面
κ=1.1502,A4=-3.2253E-06,A6=-8.4832E-09,A8=2.0857E-11,
A10=0.0000E+00,A12=0.0000E+00
第25面
κ=1.2459,A4=-1.1565E-05,A6=7.7439E-09,A8=5.7384E-11,
A10=0.0000E+00,A12=0.0000E+00
[可変間隔データ]
広角端状態 中間焦点距離状態 望遠端状態
f 28.8 100.0 292.0
D5 2.62 34.44 59.31
D13 28.91 12.89 1.47
D24 7.65 3.34 2.25
BF 38.84 76.40 96.07
[各群焦点距離データ]
群番号 群初面 群焦点距離
G1 1 106.0
G2 6 -16.8
G3 15 43.3
G4 25 67.5
[条件式対応値]
条件式(1)|X1|/fw=2.82
条件式(2)(-f2)/f3=0.40
条件式(3)f1/fw=3.66
第2実施例について、図5~図8及び表2を用いて説明する。図5は、第2実施例のレンズ構成図であり、図中上方より順に、広角端状態(W)、中間焦点距離状態(M)、望遠端状態(T)をそれぞれ示している。図5に示すように、第2実施例に係るズームレンズは、光軸に沿って物体側から順に並んだ、物体側から順に並んだ、正の屈折力を有する第1レンズ群G1と、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とを有している。
[全体諸元]
広角端状態 中間焦点距離状態 望遠端状態
f 28.80 ~ 100.0 ~ 292.0
FNO 3.52 ~ 5.23 ~ 5.87
2ω 76.3 ~ 23.6 ~ 8.2
[レンズデータ]
面番号 r d νd nd
1 136.714 2.00 32.34 1.85026
2 64.523 9.38 82.52 1.49782
3 -1208.949 0.10
4 64.486 7.48 65.44 1.60300
5 562.453 D5
*6 123.462 0.05 38.09 1.55389
7 99.219 1.00 46.62 1.81600
8 17.885 5.87
9 -36.477 1.00 46.62 1.81600
10 125.973 0.10
11 38.196 4.49 23.77 1.84666
12 -35.498 1.00
13 -24.440 1.00 46.62 1.81600
14 4961.248 D14
15 0.000 0.50 (絞りS)
16 38.660 4.28 55.79 1.70027
17 -64.767 0.10
18 28.095 5.79 82.52 1.49782
19 -31.008 1.00 23.77 1.84666
20 173.822 2.56
21 -159.081 1.00 36.06 1.70809
22 17.328 3.80 25.42 1.80518
23 51.582 D24
24 47.087 4.89 33.11 1.64431
*25 -29.683 0.10
26 52.252 5.82 70.23 1.48749
27 -20.000 1.00 40.70 1.8829
28 39.198 1.73
29 0.000 2.14 46.42 1.58267
30 -100.220 Bf
[非球面データ]
第6面
κ=1.0000,A4=3.2821E-06,A6=3.6768E-09,A8=-3.4596E-11,
A10=2.7077E-13,A12=2.0135E-16
第25面
κ=1.0000,A4=-1.3777E-05,A6=5.1709E-09,A8=-1.5922E-11,
A10=-1.8029E-14,A12=0.0000E+00
[可変間隔データ]
広角端状態 中間焦点距離状態 望遠端状態
f 28.8 100.0 292.0
D5 2.26 32.73 60.92
D14 26.99 12.49 2.00
D24 7.79 2.76 2.09
BF 38.04 77.81 90.08
[各群焦点距離データ]
群番号 群初面 群焦点距離
G1 1 105.5
G2 6 -17.4
G3 16 43.3
G4 24 57.0
[条件式対応値]
条件式(1)|X1|/fw=2.78
条件式(2)(-f2)/f3=0.39
条件式(3)f1/fw=3.68
G2 第2レンズ群
G3 第3レンズ群
G31 第31レンズ群(正レンズ群)
G32 第32レンズ群(負レンズ群)
G4 第4レンズ群
S 絞り
I 像面
CAM デジタル一眼レフカメラ(光学機器)
Claims (25)
- 物体側から順に並んだ、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とを有し、
広角端状態から望遠端状態への変倍に際して各レンズ群の間隔が変化し、
前記第3レンズ群は、物体側から順に並んだ、正の屈折力を有する正レンズ群と、負の屈折力を有する負レンズ群とを有し、前記負レンズ群を光軸と直交方向の成分を有して移動させる構成であり、
広角端状態から望遠端状態への変倍の際の前記第1レンズ群の移動量をX1とし、広角端状態におけるレンズ全系の焦点距離をfwとしたとき、次式
2.6<|X1|/fw<8.0
の条件を満足することを特徴とするズームレンズ。 - 前記第2レンズ群の焦点距離をf2とし、前記第3レンズ群の焦点距離をf3としたとき、次式
0.38<(-f2)/f3<0.50
の条件を満足することを特徴とする請求項1に記載のズームレンズ。 - 物体側から順に並んだ、正の屈折力を有する第1レンズ群と、負の屈折力を有する第2レンズ群と、正の屈折力を有する第3レンズ群と、正の屈折力を有する第4レンズ群とを有し、
広角端状態から望遠端状態への変倍に際して各レンズ群の間隔が変化し、
前記第3レンズ群は、物体側から順に並んだ、正の屈折力を有する正レンズ群と、負の屈折力を有する負レンズ群とを有し、前記負レンズ群を光軸と直交方向の成分を有して移動させる構成であり、
前記第2レンズ群の焦点距離をf2とし、前記第3レンズ群の焦点距離をf3としたとき、次式
0.38<(-f2)/f3<0.50
の条件を満足することを特徴とするズームレンズ。 - 前記第1レンズ群の焦点距離をf1とし、広角端状態におけるレンズ全系の焦点距離をfwとしたとき、次式
3.5<f1/fw<5.0
の条件を満足することを特徴とする請求項1に記載のズームレンズ。 - 前記負レンズ群は、両凹負レンズと正レンズとの接合レンズからなることを特徴とする請求項1に記載のズームレンズ。
- 前記負レンズ群は、非球面を有することを特徴とする請求項1に記載のズームレンズ。
- 前記負レンズ群は、負レンズを有し、該負レンズが非球面を有することを特徴とする請求項1に記載のズームレンズ。
- 前記負レンズ群は、物体側から順に並んだ、両凹負レンズと物体側に凸面を向けた正メニスカスレンズとの接合レンズ、または、物体側から順に並んだ、像面側に凸面を向けた正メニスカスレンズと両凹負レンズとの接合レンズからなることを特徴とする請求項1に記載のズームレンズ。
- 前記第4レンズ群は、最も物体側に配置された正レンズと、少なくとも1つの接合レンズとを有することを特徴とする請求項1に記載のズームレンズ。
- 広角端状態から望遠端状態への変倍に際し、前記第1レンズ群、前記第3レンズ群及び前記第4レンズ群が物体方向に移動することを特徴とする請求項1に記載のズームレンズ。
- 広角端状態から望遠端状態への変倍に際し、前記第1レンズ群と前記第2レンズ群との間隔は増大し、前記第2レンズ群と前記第3レンズ群との間隔は減少し、前記第3レンズ群と前記第4レンズ群との間隔は変化することを特徴とする請求項1に記載のズームレンズ。
- 広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔は、望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔よりも大きいことを特徴とする請求項1に記載のズームレンズ。
- 請求項1に記載のズームレンズを有することを特徴とする光学機器。
- 鏡筒内に、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レンズ群とを物体側からこの順に並べ、広角端状態から望遠端状態への変倍に際して各レンズ群の間隔が変化するように組み付けるステップと、
前記組み付けるステップを行うに際して、前記第3レンズ群を、正の屈折力を有する正レンズ群と、負の屈折力を有する負レンズ群とを物体側からこの順に並べて構成し、前記負レンズ群を光軸と直交方向の成分を有して移動させるように組み付けるステップとを有し、
前記組み付けるステップにおいて、広角端状態から望遠端状態への変倍の際の前記第1レンズ群の移動量をX1とし、広角端状態におけるレンズ全系の焦点距離をfwとしたとき、次式
2.6<|X1|/fw<8.0
の条件を満足することを特徴とするズームレンズの製造方法。 - 前記第2レンズ群の焦点距離をf2とし、前記第3レンズ群の焦点距離をf3としたとき、次式
0.38<(-f2)/f3<0.50
の条件を満足することを特徴とする請求項14に記載のズームレンズの製造方法。 - 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レンズ群とを物体側からこの順に並べ、広角端状態から望遠端状態への変倍に際して各レンズ群の間隔が変化するように組み付けるステップと、
前記組み付けるステップを行うに際して、前記第3レンズ群を、正の屈折力を有する正レンズ群と、負の屈折力を有する負レンズ群とを物体側からこの順に並べて構成し、前記負レンズ群を光軸と直交方向の成分を有して移動させるように組み付けるステップとを有し、
前記第2レンズ群の焦点距離をf2とし、前記第3レンズ群の焦点距離をf3としたとき、次式
0.38<(-f2)/f3<0.50
の条件を満足することを特徴とするズームレンズの製造方法。 - 前記第1レンズ群の焦点距離をf1とし、広角端状態におけるレンズ全系の焦点距離をfwとしたとき、次式
3.5<f1/fw<5.0
の条件を満足することを特徴とする請求項14に記載のズームレンズの製造方法。 - 前記負レンズ群は、両凹負レンズと正レンズとの接合レンズからなることを特徴とする請求項14に記載のズームレンズの製造方法。
- 前記負レンズ群は、非球面を有することを特徴とする請求項14に記載のズームレンズの製造方法。
- 前記負レンズ群は、負レンズを有し、該負レンズが非球面を有することを特徴とする請求項14に記載のズームレンズの製造方法。
- 前記負レンズ群は、物体側から順に並んだ、両凹負レンズと物体側に凸面を向けた正メニスカスレンズとの接合レンズ、または、物体側から順に並んだ、像面側に凸面を向けた正メニスカスレンズと両凹負レンズとの接合レンズからなることを特徴とする請求項14に記載のズームレンズの製造方法。
- 前記第4レンズ群は、最も物体側に配置された正レンズと、少なくとも1つの接合レンズとを有することを特徴とする請求項14に記載のズームレンズの製造方法。
- 広角端状態から望遠端状態への変倍に際し、前記第1レンズ群、前記第3レンズ群及び前記第4レンズ群が物体方向に移動することを特徴とする請求項14に記載のズームレンズの製造方法。
- 広角端状態から望遠端状態への変倍に際し、前記第1レンズ群と前記第2レンズ群との間隔は増大し、前記第2レンズ群と前記第3レンズ群との間隔は減少し、前記第3レンズ群と前記第4レンズ群との間隔は変化することを特徴とする請求項14に記載のズームレンズの製造方法。
- 広角端状態における前記第3レンズ群と前記第4レンズ群との空気間隔は、望遠端状態における前記第3レンズ群と前記第4レンズ群との空気間隔よりも大きいことを特徴とする請求項14に記載のズームレンズの製造方法。
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CN200980126899.9A CN102089699B (zh) | 2008-07-09 | 2009-05-12 | 变焦镜头、具有其的光学设备、和制造变焦镜头的方法 |
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US20110141578A1 (en) * | 2009-12-15 | 2011-06-16 | Takahiro Nakayama | Zoom lens, camera apparatus, information device and mobile information terminal apparatus |
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JP5171982B2 (ja) | 2011-04-15 | 2013-03-27 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
JP5825965B2 (ja) * | 2011-10-05 | 2015-12-02 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
JP5870786B2 (ja) * | 2012-03-19 | 2016-03-01 | ソニー株式会社 | ズームレンズおよび撮像装置 |
JP5972075B2 (ja) | 2012-07-09 | 2016-08-17 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
JP5984539B2 (ja) | 2012-07-09 | 2016-09-06 | キヤノン株式会社 | ズームレンズ及びそれを有する撮像装置 |
JP2014126851A (ja) | 2012-12-27 | 2014-07-07 | Tamron Co Ltd | ズームレンズ及び撮像装置 |
CN109188663B (zh) * | 2013-06-28 | 2021-10-15 | 株式会社尼康 | 变倍光学系统、光学设备和该变倍光学系统的制造方法 |
CN110612720B (zh) * | 2017-05-18 | 2022-04-12 | 索尼公司 | 信息处理装置、信息处理方法以及可读存储介质 |
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EP2128676B1 (en) | 2006-07-20 | 2016-08-17 | Nikon Corporation | Vibration-proof telephoto zoom lens having four lens groups |
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2009
- 2009-05-12 US US13/002,984 patent/US8625203B2/en active Active
- 2009-05-12 CN CN200980126899.9A patent/CN102089699B/zh active Active
- 2009-05-12 WO PCT/JP2009/058862 patent/WO2010004806A1/ja active Application Filing
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JP2004258509A (ja) * | 2003-02-27 | 2004-09-16 | Nikon Corp | ズームレンズ |
JP2005107280A (ja) * | 2003-09-30 | 2005-04-21 | Nikon Corp | 像シフト可能な高変倍光学系 |
JP2008152049A (ja) * | 2006-12-18 | 2008-07-03 | Nikon Corp | ズームレンズ、撮像装置、ズームレンズの防振方法、ズームレンズの変倍方法 |
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US20110141578A1 (en) * | 2009-12-15 | 2011-06-16 | Takahiro Nakayama | Zoom lens, camera apparatus, information device and mobile information terminal apparatus |
US8873161B2 (en) * | 2009-12-15 | 2014-10-28 | Ricoh Company, Ltd. | Zoom lens, camera apparatus, information device and mobile information terminal apparatus |
Also Published As
Publication number | Publication date |
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US8625203B2 (en) | 2014-01-07 |
CN102089699A (zh) | 2011-06-08 |
US20110116174A1 (en) | 2011-05-19 |
CN102089699B (zh) | 2014-02-05 |
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