WO2012117857A1 - Objectif zoom, dispositif optique d'imagerie, et appareil numérique - Google Patents

Objectif zoom, dispositif optique d'imagerie, et appareil numérique Download PDF

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Publication number
WO2012117857A1
WO2012117857A1 PCT/JP2012/053595 JP2012053595W WO2012117857A1 WO 2012117857 A1 WO2012117857 A1 WO 2012117857A1 JP 2012053595 W JP2012053595 W JP 2012053595W WO 2012117857 A1 WO2012117857 A1 WO 2012117857A1
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Prior art keywords
group
zoom lens
conditional expression
lens
image
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PCT/JP2012/053595
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English (en)
Japanese (ja)
Inventor
祥人 相馬
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コニカミノルタオプト株式会社
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Publication of WO2012117857A1 publication Critical patent/WO2012117857A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/144—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
    • G02B15/1445—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 negative
    • G02B15/144511—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 negative arranged -+-+

Definitions

  • the present invention relates to a zoom lens, an imaging optical device, and a digital device.
  • a digital device with an image input function such as a digital camera that captures a subject image with an image sensor (for example, a solid-state image sensor such as a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor).
  • an image sensor for example, a solid-state image sensor such as a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal-Oxide Semiconductor) type image sensor.
  • a large-diameter, compact zoom lens suitable for the camera, an imaging optical device that outputs the image of the subject captured by the zoom lens and the imaging device as an electrical signal, and image input such as a digital camera equipped with the imaging optical device And digital devices with functions.
  • Both of the above types achieve the required magnification by moving the second group relatively large toward the object side when zooming from the wide-angle end to the telephoto end. For this reason, it has been difficult to shorten the optical total length at the telephoto end.
  • it is necessary to secure a sufficient air gap between the first group and the second group at the wide-angle end, and the overall length is also shortened at the wide-angle end. was difficult.
  • the minimum optical total length in the zoom range is relatively large, and in order to improve portability, it is necessary to mount a retracting mechanism to realize a state in which the total length is shorter than the entire zoom range. It was.
  • the present invention has been made in view of such a situation, and an object of the present invention is to include a relatively wide focal length range in which the angle of view (2 ⁇ ) exceeds 80 degrees, and about F2.8 in the entire zoom range.
  • an imaging optical device and digital apparatus equipped with the zoom lens It is in.
  • a zoom lens according to a first invention comprises, in order from the object side, a first group having negative power, a second group having positive power, a third group having negative power, and a positive group.
  • a zoom lens that performs zooming by changing an interval between each group, and at least zooming from the first group to the third group in zooming from the wide-angle end to the telephoto end.
  • Each move the distance between the first group and the second group decreases, the distance between the second group and the third group changes, and the distance between the third group and the fourth group changes.
  • conditional expression (1) and conditional expression (3) are satisfied.
  • M1 Movement amount of the first lens unit from the wide-angle end to the telephoto end
  • M2 the amount of movement of the second group from the wide-angle end to the telephoto end
  • ⁇ 3t Paraxial lateral magnification of the third lens unit at the telephoto end, It is.
  • the zoom lens according to a second aspect of the invention is characterized in that, in the first aspect of the invention, the following conditional expression (2) is satisfied.
  • TL2t / Ymax ⁇ 8.0 (2)
  • TL2t distance from the lens surface closest to the object side to the image plane in the second group at the telephoto end
  • Ymax maximum image height
  • a zoom lens according to a third aspect of the invention is characterized in that, in the first aspect of the invention, the following conditional expression (4) is satisfied. ⁇ 3.0 ⁇ f1 / fw ⁇ 2.0 (4) However, f1: focal length of the first group, fw: focal length of the entire system at the wide-angle end, It is.
  • a zoom lens according to a fourth aspect of the invention is characterized in that, in the first aspect of the invention, the following conditional expression (5) is satisfied.
  • T3 thickness on the optical axis of the third group
  • TLw distance from the lens surface closest to the object side of the first group at the wide angle end to the image plane, It is.
  • the zoom lens according to a fifth aspect of the present invention is characterized in that, in the first aspect, the third group includes at least one aspheric surface.
  • a zoom lens according to a sixth aspect of the invention is characterized in that, in the first aspect, the following conditional expression (6) is satisfied. 0.7 ⁇ 3t / ⁇ 3w ⁇ 1.5 (6) However, ⁇ 3w: Paraxial lateral magnification of the third lens unit at the wide angle end, It is.
  • the zoom lens according to an eighth aspect of the present invention is characterized in that, in the first aspect, focusing is performed by moving the third group.
  • a zoom lens according to a ninth aspect of the invention is characterized in that, in the first aspect of the invention, the following conditional expression (8) is satisfied. 0.7 ⁇ f2 / ⁇ (fw ⁇ ft) ⁇ 1.5 (8)
  • f2 focal length of the second group
  • fw focal length of the entire system at the wide-angle end
  • ft focal length of the entire system at the telephoto end
  • a zoom lens according to a tenth aspect of the invention is characterized in that, in the first aspect of the invention, the following conditional expression (9) is satisfied. ⁇ 1.6 ⁇ f3 / ⁇ (fw ⁇ ft) ⁇ 0.5 (9)
  • f3 focal length of the third group
  • fw focal length of the entire system at the wide-angle end
  • ft focal length of the entire system at the telephoto end
  • a zoom lens according to an eleventh aspect of the invention is characterized in that, in the first aspect of the invention, the following conditional expression (10) is satisfied. 1.1 ⁇ f4 / ⁇ (fw ⁇ ft) ⁇ 2.3 (10) However, f4: focal length of the fourth group, fw: focal length of the entire system at the wide-angle end, ft: focal length of the entire system at the telephoto end, It is.
  • a zoom lens according to a twelfth aspect of the present invention is the zoom lens according to the first aspect of the present invention, in which the lens group including the most image side lens constituting the second group is moved perpendicularly to the optical axis to correct camera shake. It is characterized by performing.
  • a zoom lens according to a thirteenth aspect of the present invention is the interchangeable lens for a digital camera according to the first aspect of the present invention.
  • An image pickup optical apparatus includes the zoom lens according to the first aspect and an image pickup element that converts an optical image formed on the light receiving surface into an electrical signal, and receives light from the image pickup element.
  • the zoom lens is provided so that an optical image of a subject is formed on the surface.
  • a digital apparatus is characterized in that at least one of a still image shooting and a moving image shooting function of a subject is added by including the imaging optical device according to the fourteenth aspect.
  • the zoom lens system has a configuration that satisfies the conditional expression (1) and further satisfies the conditional expression (3) in zooming from the wide-angle end to the telephoto end, so that the total optical length on the telephoto side can be shortened. Is possible. Therefore, it includes a relatively wide angle focal length range in which the angle of view (2 ⁇ ) exceeds 80 degrees, and has high optical performance in spite of a relatively large aperture of about F2.8 in the entire zoom range. A zoom lens and an imaging optical device that are excellent in portability can be realized by reducing the minimum value of the optical total length. Further, by using the large-diameter and compact zoom lens or the imaging optical device for a digital device (for example, a digital camera), a high-performance image input function can be added to the digital device in a compact manner.
  • a digital device for example, a digital camera
  • FIG. 3 is a longitudinal aberration diagram of Example 1.
  • FIG. 6 is a longitudinal aberration diagram of Example 2.
  • FIG. 6 is a longitudinal aberration diagram of Example 3.
  • FIG. 6 is a longitudinal aberration diagram of Example 4.
  • FIG. 6 is a longitudinal aberration diagram of Example 5.
  • FIG. 6 is a longitudinal aberration diagram of Example 6.
  • FIG. 6 is a lateral aberration diagram at the wide-angle end before and after camera shake correction in Example 1.
  • FIG. 4 is a lateral aberration diagram before and after camera shake correction in Example 1 at the telephoto end.
  • FIG. 6 is a lateral aberration diagram at the wide-angle end before and after camera shake correction in Example 2.
  • FIG. 6 is a lateral aberration diagram before and after camera shake correction in Example 2 at the telephoto end.
  • FIG. 10 is a lateral aberration diagram at the wide-angle end before and after camera shake correction in Example 3.
  • FIG. 10 is a lateral aberration diagram before and after camera shake correction in Example 3 at the telephoto end.
  • FIG. 10 is a lateral aberration diagram before and after camera shake correction in Example 4 at the wide-angle end.
  • FIG. 10 is a lateral aberration diagram before and after camera shake correction in Example 4 at the telephoto end.
  • FIG. 10 is a lateral aberration diagram at the wide-angle end before and after camera shake correction in Example 5.
  • FIG. 12 is a lateral aberration diagram before and after camera shake correction in Example 5 at the telephoto end.
  • FIG. 12 is a lateral aberration diagram before and after camera shake correction in Example 6 at the wide-angle end.
  • FIG. 10 is a lateral aberration diagram before and after camera shake correction in Example 6 at the telephoto end.
  • FIG. 3 is a schematic diagram illustrating a schematic configuration example of a digital device equipped with an imaging optical device.
  • the zoom lens according to the present invention includes, in order from the object side, a first group having negative power, a second group having positive power, a third group having negative power, and a fourth group having positive power.
  • M1 Movement amount of the first lens unit from the wide-angle end to the telephoto end
  • M2 the amount of movement of the second group from the wide-angle end to the telephoto end, It is.
  • zooming by changing the distance between the first group and the second group is the same as in the conventional zoom type.
  • the conditional expression (1 ) Is moved so as to satisfy (2), the optical total length on the telephoto side can be shortened.
  • the moving amount of the first group is relatively larger than the moving amount of the second group (the moving amount is a lens at the wide-angle end and the telephoto end). This is a difference in the group position.)
  • the total optical length at the telephoto end is significantly shortened. Therefore, even if a retractable configuration is not employed, the minimum value of the optical total length in the zoom range is reduced, and a zoom lens having excellent portability can be realized.
  • conditional expression (1) If the lower limit of conditional expression (1) is not reached, the above effect cannot be fully exhibited, and the shortening of the optical total length on the telephoto side becomes insufficient. If the upper limit of conditional expression (1) is exceeded, the amount of movement of the first group becomes too large, and the effective diameter of the lenses constituting the first group increases in order to ensure peripheral illuminance at the wide-angle end. Not desirable. In addition, distortion and astigmatism may increase and the off-axis performance may deteriorate.
  • the optical field of view (2 ⁇ ) includes a relatively wide focal length range exceeding 80 degrees, and has high optical performance in spite of a relatively large aperture of about F2.8 in the entire zoom range. It is possible to reduce the minimum optical total length in the zoom range and realize a zoom lens having excellent portability and an image pickup optical apparatus including the zoom lens. If the zoom lens or the imaging optical device is used in a digital device such as a digital camera, a high-performance image input function can be added to the digital device in a lightweight and compact manner. Therefore, it can contribute to the downsizing, cost reduction, high performance, high functionality, etc. of digital equipment.
  • the zoom lens according to the present invention is an interchangeable lens for a mirrorless type digital camera in order to shorten the lens back and increase the diameter (for example, to maintain F2.8 in the entire zoom range). Therefore, it is possible to realize a compact interchangeable lens that is convenient to carry.
  • the conditions for achieving such effects in a well-balanced manner and achieving higher optical performance, downsizing, etc. will be described below.
  • conditional expression (1a) 1.1 ⁇
  • the conditional expression (1a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (1). Therefore, the above effect can be further enhanced preferably by satisfying conditional expression (1a).
  • the effective diameter of the second lens group can be made relatively small while setting a relatively small F number of F2.8 at the telephoto end. If the condition range of the conditional expression (2) is not satisfied, the effective diameter of the second group becomes large. In addition, since the thickness on the optical axis of the first group must be shortened, it becomes difficult to correct distortion and astigmatism at the wide-angle end.
  • conditional expression (2a) It is more desirable to satisfy the following conditional expression (2a). TL2t / Ymax ⁇ 7.0 (2a)
  • This conditional expression (2a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (2). Therefore, the above effect can be further increased preferably by satisfying conditional expression (2a).
  • conditional expression (3) the convergence degree of the axial light beam emitted from the second group at the telephoto end can be relaxed after passing through the third group, and can be brought close to a so-called telephoto type. As a result, the total optical length at the telephoto end can be shortened. If the lower limit of conditional expression (3) is not reached, the above effect cannot be sufficiently exhibited, and it becomes difficult to shorten the optical total length at the telephoto end. Alternatively, since the principal point position of the second group must be moved to the object side, it is necessary to increase the power of the lens located closest to the object side in the second group.
  • conditional expression (3a) It is more desirable to satisfy the following conditional expression (3a). 2.4 ⁇ 3t ⁇ 3.9 (3a)
  • This conditional expression (3a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (3). Therefore, the above effect can be further increased preferably by satisfying conditional expression (3a).
  • f1 focal length of the first group
  • fw focal length of the entire system at the wide-angle end
  • the power of the first group becomes too weak and the total length of the wide-angle end becomes large. As a result, the effective diameter of the lenses constituting the first group increases, which is not desirable. Further, if the total length is to be suppressed, the principal point position of the second group must be brought close to the image plane, so that it is necessary to increase the power of the second group and it becomes difficult to correct spherical aberration and coma aberration. If the upper limit of conditional expression (4) is exceeded, the power of the first lens group becomes too strong, and it becomes difficult to correct astigmatism and distortion at the wide-angle end.
  • conditional expression (4a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (4). Therefore, the above effect can be further increased preferably by satisfying conditional expression (4a).
  • T3 thickness on the optical axis of the third group
  • TLw distance from the lens surface closest to the object side of the first group at the wide angle end to the image plane
  • the thickness of the third group is reduced so as to satisfy the conditional expression (5), the position of the second group at the wide-angle end can be brought closer to the image plane, and the widening at the wide-angle end can be easily achieved. If the upper limit of conditional expression (5) is exceeded, the optical total length at the wide-angle end will increase, or the power of the first group will need to be increased. As a result, an increase in the lens system of the first group occurs, or correction of astigmatism and distortion at the wide-angle end becomes difficult, which is not desirable.
  • conditional expression (5a) T3 / TLw ⁇ 0.014
  • This conditional expression (5a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (5). Therefore, the above effect can be further increased preferably by satisfying conditional expression (5a).
  • the third group includes at least one aspheric surface.
  • the third group has an appropriate on-axis ray height and off-axis chief ray height in the entire zoom range, and is an effective part for correcting astigmatism and coma aberration.
  • As the aspherical surface an aspherical surface having a negative power stronger toward the periphery is preferable, and it is more preferable that the aspherical surface is disposed on the image side surface of the lens.
  • conditional expression (6) For example, if at least one aspherical surface is used for the third lens group, and further satisfying conditional expression (6) to reduce the zooming burden of the third lens group, the change in the light incident angle in the entire zoom range is suppressed.
  • a degree of freedom can be used for correction of point aberration and coma. If the condition range of the conditional expression (6) is not satisfied, the zooming load of the third lens group will increase, and astigmatism and coma may be deteriorated.
  • the third group has one negative lens that satisfies the following conditional expression (7). 0.4 ⁇ SF ⁇ 0.88 (7)
  • SF (R1 + R2) / (R1-R2)
  • R1 radius of curvature of object side surface of negative lens
  • R2 radius of curvature of the image side surface of the negative lens
  • conditional expression (7) By satisfying conditional expression (7), it is possible to generate positive distortion in the third group and cancel out large negative distortion generated in the first group at the wide-angle end. If the lower limit of conditional expression (7) is not reached, the above effect cannot be obtained sufficiently, and if the upper limit of conditional expression (7) is exceeded, coma may increase.
  • the third group is preferable as the focusing group.
  • conditional expressions (8) to (10) It is desirable to satisfy at least one of the following conditional expressions (8) to (10), and it is more desirable to satisfy all three conditional expressions (8) to (10).
  • f2 focal length of the second group
  • f3 focal length of the third group
  • f4 focal length of the fourth group
  • fw focal length of the entire system at the wide-angle end
  • ft focal length of the entire system at the telephoto end
  • conditional expression (8) If the lower limit of conditional expression (8) is not reached, the power of the second group becomes too strong, and it becomes difficult to correct spherical aberration and coma. If the upper limit of conditional expression (8) is exceeded, the optical system becomes undesirably large.
  • conditional expression (8a) It is more desirable to satisfy the following conditional expression (8a). 0.9 ⁇ f2 / ⁇ (fw ⁇ ft) ⁇ 1.3 (8a)
  • This conditional expression (8a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (8). Therefore, the above effect can be further increased preferably by satisfying conditional expression (8a).
  • conditional expression (9) If the upper limit of conditional expression (9) is exceeded, the power of the third lens group becomes too strong, making it difficult to correct astigmatism and coma. If the lower limit of conditional expression (9) is not reached, the optical system becomes undesirably large.
  • conditional expression (10) If the lower limit of conditional expression (10) is not reached, the power of the fourth group becomes too strong, and it becomes difficult to secure a sufficient lens back. If the upper limit of conditional expression (10) is exceeded, the optical system becomes undesirably large.
  • the third group generates a large amount of aberration due to decentration, and is not suitable as a camera shake correction group.
  • the fourth group is unsuitable because the camera shake correction sensitivity is too low, and the first group and the first lens in the first group are unsuitable because the lens outer diameter is large.
  • the entire second group is unsuitable because the camera shake correction sensitivity is too high. Therefore, a part of the second group is a candidate, but since the object-side lens in the second group has a high axial ray height, it is difficult to suppress the occurrence of aberration due to the decentering of the lens. Therefore, it is desirable that the element closest to the image plane in the second group is a camera shake correction group.
  • the camera shake correction group satisfies the following conditional expressions (11) and (12). 0.2 ⁇ (1- ⁇ dw) ⁇ rw ⁇ 2.0 (11) 0.6 ⁇ (1- ⁇ dt) ⁇ rt ⁇ 2.0 (12)
  • ⁇ dw Paraxial lateral magnification at the wide angle end of the image stabilization group
  • ⁇ rw Paraxial lateral magnification at the wide angle end of the lens system arranged on the image plane side relative to the camera shake correction group
  • ⁇ dt Paraxial lateral magnification at the telephoto end of the camera shake correction group
  • ⁇ rt Paraxial lateral magnification at the telephoto end of the lens system arranged on the image plane side relative to the camera shake correction group
  • conditional expression (11) or conditional expression (12) If the lower limit of conditional expression (11) or conditional expression (12) is not reached, the sensitivity of camera shake correction is too low, and it becomes necessary to ensure a large movement range of the camera shake correction group. If the upper limit of conditional expression (11) or conditional expression (12) is exceeded, the sensitivity of camera shake correction is too high and control becomes difficult. For example, if the camera shake correction group moves due to electrical noise or the like, the image moves, so the image quality integrated over the entire exposure time deteriorates.
  • the zoom lens according to the present invention is suitable for use as an imaging lens for a digital device with an image input function (for example, a digital camera). By combining this with an imaging device or the like, an image of a subject is optically captured.
  • an imaging optical device that outputs an electrical signal can be configured.
  • the imaging optical device is an optical device that constitutes a main component of a camera used for still image shooting and moving image shooting of a subject, for example, a zoom lens that forms an optical image of an object in order from the object (that is, subject) side, And an imaging device that converts an optical image formed by the zoom lens into an electrical signal.
  • the zoom lens having the above-described characteristic configuration is arranged so that an optical image of the subject is formed on the light receiving surface (that is, the imaging surface) of the image sensor.
  • a high-performance imaging optical device and a digital device for example, a digital camera or a mobile phone
  • a digital device for example, a digital camera or a mobile phone
  • cameras include digital cameras, video cameras, surveillance cameras, in-vehicle cameras, videophone cameras, etc., and small and portable information such as personal computers and digital devices (for example, mobile phones and mobile computers).
  • Device terminals for example, mobile phones and mobile computers.
  • peripheral devices for example, peripheral devices (scanners, printers, etc.), cameras incorporated in or external to other digital devices, and the like.
  • a digital device with an image input function such as a mobile phone with a camera can be configured.
  • FIG. 25 is a schematic cross-sectional view showing a schematic configuration example of a digital device DU having an image input function.
  • the imaging optical device LU mounted on the digital device DU shown in FIG. 25 sequentially forms an optical image (image plane) IM of the object so as to be variable in order from the object (namely, subject) side.
  • an imaging element SR that converts an optical image IM formed on the light receiving surface SS by ZL into an electrical signal.
  • the imaging optical device LU When a digital device DU with an image input function is constituted by this imaging optical device LU, the imaging optical device LU is usually arranged inside the body, but when necessary to realize the camera function, a form as necessary is adopted. Is possible.
  • the unitized imaging optical device LU can be configured to be detachable or rotatable with respect to the main body of the digital device DU.
  • the image sensor SR for example, a solid-state image sensor such as a CCD image sensor or a CMOS image sensor having a plurality of pixels is used. Since the zoom lens ZL is provided so that the optical image IM of the subject is formed on the light receiving surface SS which is a photoelectric conversion unit of the image sensor SR, the optical image IM formed by the zoom lens ZL is the image sensor. It is converted into an electric signal by SR.
  • the digital device DU includes a signal processing unit 1, a control unit 2, a memory 3, an operation unit 4, a display unit 5 and the like in addition to the imaging optical device LU.
  • the signal generated by the image sensor SR is subjected to predetermined digital image processing, image compression processing, and the like as required by the signal processing unit 1 and recorded as a digital video signal in the memory 3 (semiconductor memory, optical disk, etc.) In some cases, it is transmitted to other devices via a cable or converted into an infrared signal or the like (for example, a communication function of a mobile phone).
  • the control unit 2 is composed of a microcomputer, and controls functions such as a shooting function (still image shooting function, moving image shooting function, etc.), an image reproduction function, etc .; control of a lens moving mechanism for zooming and focusing, etc. Do.
  • the control unit 2 controls the imaging optical device LU so as to perform at least one of still image shooting and moving image shooting of a subject.
  • the display unit 5 includes a display such as a liquid crystal monitor, and displays an image using an image signal converted by the image sensor SR or image information recorded in the memory 3.
  • the operation unit 4 is a part including operation members such as an operation button (for example, a release button) and an operation dial (for example, a shooting mode dial), and transmits information input by the operator to the control unit 2.
  • the zoom lens ZL has a large-aperture negative lead zoom configuration including four negative, positive, and positive groups. At least the first to third groups move along the optical axis AX, respectively. In this configuration, zooming is performed by changing the group interval, and an optical image IM is formed on the light receiving surface SS of the image sensor SR.
  • FIGS. 1 to 6 are lens configuration diagrams respectively corresponding to the zoom lenses ZL constituting the first to sixth embodiments.
  • the wide-angle end (W), the intermediate focal length state (M), and the telephoto end (T The lens arrangement at) is shown by an optical cross section.
  • Arrows m1, m2, m3, and m4 in each lens configuration diagram indicate the first group Gr1, the second group Gr2, the third group Gr3, and the fourth group Gr4 in zooming from the wide-angle end (W) to the telephoto end (T). Are schematically shown by approximating each of them linearly (the broken line indicates the fixed zoom position).
  • the first group Gr1 to the third group Gr3 are moving groups, and the fourth group Gr4 is a fixed group. Therefore, the first group Gr1 to the third group Gr3 move during zooming, and the fourth group Gr4 is fixed at the zoom position.
  • the third group Gr3 is a focus group, and as shown by an arrow mF, the third group Gr3 is extended to the image side during focusing on a short-distance object.
  • the aperture stop ST is located on the object side of the second group Gr2, and moves together with the second group Gr2 during zooming.
  • One lens on the most image side constituting the second group Gr2 constitutes a camera shake correction group GrC, and the camera shake correction group GrC is moved perpendicularly to the optical axis AX as indicated by an arrow mC. Is used to correct camera shake.
  • the aspheric surfaces are the image side surface of the second lens, both surfaces of the fourth lens, the image side surface of the seventh lens, and both surfaces of the ninth lens.
  • the first group Gr1 to the fourth group Gr4 are moving groups. Accordingly, the first group Gr1 to the fourth group Gr4 move during zooming.
  • the third group Gr3 is a focus group, and as shown by an arrow mF, the third group Gr3 is extended to the image side during focusing on a short-distance object.
  • the aperture stop ST is located on the object side of the second group Gr2, and moves together with the second group Gr2 during zooming.
  • One lens on the most image side constituting the second group Gr2 constitutes a camera shake correction group GrC, and the camera shake correction group GrC is moved perpendicularly to the optical axis AX as indicated by an arrow mC. Is used to correct camera shake.
  • the aspheric surfaces are the image side surface of the second lens, both surfaces of the fourth lens, and both surfaces of the ninth lens.
  • the first group Gr1 to the fourth group Gr4 are moving groups. Accordingly, the first group Gr1 to the fourth group Gr4 move during zooming.
  • the third group Gr3 is a focus group, and as shown by an arrow mF, the third group Gr3 is extended to the image side during focusing on a short-distance object.
  • One lens on the most image side constituting the second group Gr2 constitutes a camera shake correction group GrC, and the camera shake correction group GrC is moved perpendicularly to the optical axis AX as indicated by an arrow mC. Is used to correct camera shake.
  • the aperture stop ST is located on the object side of the camera shake correction group GrC and moves together with the second group Gr2 during zooming.
  • the aspheric surfaces are the image side surface of the second lens, both surfaces of the fourth lens, and both surfaces of the ninth lens.
  • the first group Gr1 to the third group Gr3 are moving groups, and the fourth group Gr4 is a fixed group. Therefore, the first group Gr1 to the third group Gr3 move during zooming, and the fourth group Gr4 is fixed at the zoom position.
  • the third group Gr3 is a focus group, and as shown by an arrow mF, the third group Gr3 is extended to the image side during focusing on a short-distance object.
  • One lens on the most image side constituting the second group Gr2 constitutes a camera shake correction group GrC, and the camera shake correction group GrC is moved perpendicularly to the optical axis AX as indicated by an arrow mC. Is used to correct camera shake.
  • the aperture stop ST is located on the object side of the camera shake correction group GrC and moves together with the second group Gr2 during zooming. Between the first group Gr1 and the second group Gr2, a flare stopper FS that moves without changing the aperture diameter during zooming is disposed.
  • the aspheric surfaces are the image side surface of the second lens, both surfaces of the fourth lens, and both surfaces of the ninth lens.
  • the first group Gr1 to the fourth group Gr4 are moving groups. Accordingly, the first group Gr1 to the fourth group Gr4 move during zooming.
  • the third group Gr3 is a focus group, and as shown by an arrow mF, the third group Gr3 is extended to the image side during focusing on a short-distance object.
  • the aperture stop ST is located on the object side of the second group Gr2, and moves together with the second group Gr2 during zooming.
  • the cemented lens closest to the image side constituting the second group Gr2 constitutes a camera shake correction group GrC. As indicated by an arrow mC, the camera shake correction group GrC is moved perpendicularly to the optical axis AX. Camera shake correction is performed.
  • the aspheric surfaces are the image side surface of the second lens, both surfaces of the fourth lens, and both surfaces of the ninth lens.
  • Examples 1 to 6 (EX1 to EX6) listed here are numerical examples corresponding to the first to sixth embodiments, respectively, and are optical configuration diagrams showing the first to sixth embodiments. (FIGS. 1 to 6) show the lens configurations of the corresponding Examples 1 to 6, respectively.
  • the back focus (BF, mm) and the variable surface interval di (i: surface number, mm) are shown for each focal length state, and the focal length (mm) of each lens group is shown as zoom lens group data.
  • BF used here is the distance from the image side surface of the cover glass (corresponding to the plane parallel plate PT) to the image plane
  • the total lens length is the distance from the lens front surface to the image plane.
  • Table 1 shows values of parameters used in the conditional expressions for each example
  • Table 2 shows values corresponding to the conditional expressions of each example.
  • FIGS. 7 to 12 are aberration diagrams corresponding to Examples 1 to 6 (EX1 to EX6), respectively (normal time (before decentering), longitudinal aberration diagram in the infinite focus state), and (W) Indicates various aberrations at the wide-angle end, (M) at the middle, and (T) at the telephoto end (in order from the left are spherical aberration, astigmatism, and distortion aberration).
  • FNO is the F number
  • Y '(mm) is the maximum image height Ymax (corresponding to the distance from the optical axis AX) on the light receiving surface SS of the image sensor SR.
  • solid line d, alternate long and short dash line g, and alternate long and two short dashes line c represent spherical aberration (mm) with respect to d line, g line, and c line, respectively, and broken line SC represents unsatisfactory sine condition (mm).
  • broken line DM represents the meridional surface
  • the solid line DS represents each astigmatism (mm) with respect to the d-line on the sagittal surface.
  • the solid line represents the distortion (%) with respect to the d-line.
  • FIGS. 13 to 24 are lateral aberration diagrams of the first to sixth embodiments (EX1 to EX6) in the infinite focus state before the eccentricity (normal time) and after the eccentricity (when the camera shake is corrected).
  • 14 and FIG. 14 are Embodiment 1
  • FIGS. 15 and 16 are Embodiment 2
  • FIGS. 17 and 18 are Embodiment 3
  • FIGS. 19 and 20 are Embodiment 4
  • FIGS. 21 and 22 are Embodiment 5
  • FIG. 24 and FIG. 24 correspond to Example 6, respectively.
  • (A) and (B) are lateral aberration diagrams before decentration
  • (C) to (E) are lateral aberration diagrams after decentration (y ′ (mm) is the image sensor SR.
  • the maximum image height Ymax on the light receiving surface SS (corresponding to the distance from the optical axis AX).
  • FIG. 13, FIG. 15, FIG. 17, FIG. 19, FIG. 21, and FIG. 23 correct the image blur of 0.3 degrees at the wide angle end (W) by the eccentricity of the decentering lens component (ie, camera shake correction group GrC).
  • FIG. 16, FIG. 18, FIG. 20, FIG. 22, and FIG. 24 show an angle of 0.3 degrees at the telephoto end (T). It represents the deterioration of lateral aberration on and off the axis when image blur is corrected by the eccentricity of the decentering lens component.
  • the aberration deterioration is small, and good performance can be ensured even in the camera shake correction state.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

La présente invention concerne un objectif zoom négatif/positif/négatif/positif dans lequel lors de la modification de l'agrandissement depuis l'extrémité grand angle vers l'extrémité télescopique les effets suivants se produisent: au moins un premier jusqu'à un troisième groupe se déplacent individuellement, l'intervalle entre le premier groupe et le troisième groupe diminue, l'intervalle entre le second groupe et le troisième groupe se modifie, l'intervalle entre le troisième groupe et le quatrième groupe augmente, et les expressions conditionnelles 0,9 < |M1/M2| < 2,5 et 2,0 < β3t < 4,4 sont remplies, où M1 est le déplacement du premier groupe depuis l'extrémité grand angle jusqu'à l'extrémité télescopique, M2 est le déplacement du second groupe depuis l'extrémité grand angle jusqu'à l'extrémité télescopique, et β3t est l'agrandissement latéral de la région paraxiale du troisième groupe à l'extrémité télescopique.
PCT/JP2012/053595 2011-03-02 2012-02-16 Objectif zoom, dispositif optique d'imagerie, et appareil numérique WO2012117857A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114467047A (zh) * 2019-10-08 2022-05-10 华为技术有限公司 光学装置、成像装置及移动设备
WO2024057734A1 (fr) * 2022-09-13 2024-03-21 富士フイルム株式会社 Lentille à focale variable et dispositif d'imagerie

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4923912B1 (fr) * 1970-12-15 1974-06-19
JPH0392808A (ja) * 1989-09-05 1991-04-18 Canon Inc ズームレンズ
JP2008191306A (ja) * 2007-02-02 2008-08-21 Olympus Imaging Corp 結像光学系及びそれを有する電子撮像装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4923912B1 (fr) * 1970-12-15 1974-06-19
JPH0392808A (ja) * 1989-09-05 1991-04-18 Canon Inc ズームレンズ
JP2008191306A (ja) * 2007-02-02 2008-08-21 Olympus Imaging Corp 結像光学系及びそれを有する電子撮像装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114467047A (zh) * 2019-10-08 2022-05-10 华为技术有限公司 光学装置、成像装置及移动设备
CN114467047B (zh) * 2019-10-08 2023-04-28 华为技术有限公司 光学装置、成像装置及移动设备
WO2024057734A1 (fr) * 2022-09-13 2024-03-21 富士フイルム株式会社 Lentille à focale variable et dispositif d'imagerie

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