WO2013105190A1 - Système de lentille zoom, dispositif d'imagerie et caméra - Google Patents

Système de lentille zoom, dispositif d'imagerie et caméra Download PDF

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Publication number
WO2013105190A1
WO2013105190A1 PCT/JP2012/008241 JP2012008241W WO2013105190A1 WO 2013105190 A1 WO2013105190 A1 WO 2013105190A1 JP 2012008241 W JP2012008241 W JP 2012008241W WO 2013105190 A1 WO2013105190 A1 WO 2013105190A1
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Prior art keywords
lens
zoom lens
lens system
image
lens group
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PCT/JP2012/008241
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English (en)
Japanese (ja)
Inventor
岩下　勉
朴　一武
靖典 東地
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パナソニック株式会社
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Publication of WO2013105190A1 publication Critical patent/WO2013105190A1/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
    • G02B15/143—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 three groups only
    • G02B15/1435—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 three groups only the first group being negative
    • G02B15/143507—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 three groups only the first group being negative 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
    • G02B15/144—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 +-++
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof

Definitions

  • the present disclosure relates to a zoom lens system, an imaging device, and a camera.
  • a digital camera such as a digital still camera or a digital video camera
  • a compact digital camera equipped with a zoom lens system having a high zooming ratio is strongly demanded for its convenience.
  • a zoom lens system having a wide angle range with a wide shooting range for example, various zoom lens systems having a negative lead three-group structure and a positive lead four-group structure have been proposed.
  • a variable aperture for determining an open F-number is arranged on the object side of a second lens group having a three-group configuration of the negative lead and having a positive refractive power.
  • a zoom lens is disclosed in which a mechanical aperture for cutting harmful rays is arranged on the image side.
  • the present disclosure not only has a high resolution but also a zooming ratio as high as 5 times or more, and also has a large angle of view at the wide-angle end and can be sufficiently adapted to wide-angle shooting while being compact.
  • a zoom lens system capable of forming an image having a desired brightness in accordance with a zoom position.
  • the present disclosure also provides an imaging apparatus including the zoom lens system and a thin and compact camera including the imaging apparatus.
  • the zoom lens system in the present disclosure is: Having a plurality of lens groups composed of at least one lens element; With at least two aperture stops, At least one lens element is disposed between the at least two aperture stops; During zooming from the wide-angle end to the telephoto end during imaging, one of the at least two aperture stops is selected and the amount of light is adjusted according to the zoom position.
  • An imaging apparatus capable of outputting an optical image of an object as an electrical image signal, A zoom lens system that forms an optical image of the object; An image sensor that converts an optical image formed by the zoom lens system into an electrical image signal;
  • the zoom lens system is Having a plurality of lens groups composed of at least one lens element; With at least two aperture stops, At least one lens element is disposed between the at least two aperture stops; During zooming from the wide-angle end to the telephoto end during imaging, one of the at least two aperture stops is selected and the amount of light is adjusted according to the zoom position.
  • the camera in the present disclosure is A camera that converts an optical image of an object into an electrical image signal, and displays and stores the converted image signal;
  • An image pickup apparatus including a zoom lens system that forms an optical image of an object, and an image sensor that converts an optical image formed by the zoom lens system into an electrical image signal;
  • the zoom lens system is Having a plurality of lens groups composed of at least one lens element; With at least two aperture stops, At least one lens element is disposed between the at least two aperture stops; During zooming from the wide-angle end to the telephoto end during imaging, one of the at least two aperture stops is selected and the amount of light is adjusted according to the zoom position.
  • the zoom lens system according to the present disclosure not only has high resolution, but also has a high zooming ratio of about 5 times or more, and also has a large angle of view at the wide-angle end and is small enough to be used for wide-angle shooting. In addition, it is possible to form an image having a desired brightness according to the zoom position.
  • FIG. 1 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 1 (Numerical Example 1).
  • FIG. 2 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 1 when the zoom lens system is in focus at infinity.
  • FIG. 3 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 2 (Numerical Example 2).
  • FIG. 4 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 2 when the zoom lens system is in focus at infinity.
  • FIG. 5 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 3 (Numerical Example 3).
  • FIG. 6 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 3 when the zoom lens system is in focus at infinity.
  • FIG. 7 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 4 (Numerical Example 4).
  • FIG. 8 is a longitudinal aberration diagram of the zoom lens system according to Numerical Example 4 when the zoom lens system is in focus at infinity.
  • FIG. 9 is a schematic configuration diagram of a digital still camera according to the fifth embodiment.
  • Embodiments 1 to 4) 1, 3, 5, and 7 are lens arrangement diagrams of the zoom lens systems according to Embodiments 1 to 4, respectively, and all represent the zoom lens system in an infinitely focused state.
  • the lens configuration of T )) and (c) show the lens configuration at the telephoto end (longest focal length state: focal length f T ).
  • the broken line arrows provided between FIGS. (A) and (b) are obtained by connecting the positions of the lens groups in the wide-angle end, the intermediate position, and the telephoto end in order from the top. Straight line.
  • the wide-angle end and the intermediate position, and the intermediate position and the telephoto end are simply connected by a straight line, which is different from the actual movement of each lens group.
  • FIGS. 1, 3, 5, and 7 show directions in which a third lens group G3, which will be described later, moves during focusing from an infinitely focused state to a close object focused state.
  • the zoom lens systems according to Embodiments 1 and 2 in order from the object side to the image side, the first lens group G1 having negative power, the second lens group G2 having positive power, and the positive power And a third lens group G3.
  • the distance between the lens groups that is, the distance between the first lens group G1 and the second lens group G2, and the distance between the second lens group G2 and the third lens group G3 are all changed. All lens groups move in the direction along the optical axis.
  • the zoom lens system according to each embodiment can reduce the size of the entire lens system while maintaining high optical performance by arranging these lens groups in a desired power arrangement.
  • the zoom lens systems according to Embodiments 3 and 4 the first lens group G1 having a positive power, the second lens group G2 having a negative power, and the positive power in order from the object side to the image side. And a fourth lens group G4 having a positive power.
  • the distance between the lens groups that is, the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, and the third lens group G3 and the third lens group G3. All the lens groups are moved in the direction along the optical axis so that the intervals between the four lens groups G4 are all changed.
  • the zoom lens system according to each embodiment can reduce the size of the entire lens system while maintaining high optical performance by arranging these lens groups in a desired power arrangement.
  • an asterisk * attached to a specific surface indicates that the surface is aspherical.
  • a symbol (+) and a symbol ( ⁇ ) attached to a symbol of each lens group correspond to a power symbol of each lens group.
  • the straight line described on the rightmost side represents the position of the image plane S.
  • the object side of the image plane S (FIGS. 1 and 3: the image plane S and the most image side lens surface of the third lens group G3). 5 and 7: between the image plane S and the most image side lens surface of the fourth lens group G4), a parallel flat plate P equivalent to an optical low-pass filter, a face plate of an image sensor, or the like is provided. It has been.
  • the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a positive meniscus having a convex surface facing the object side.
  • the second lens element L2 having a shape. Among these, the second lens element L2 has two aspheric surfaces.
  • the second lens group G2 includes, in order from the object side to the image side, a biconvex third lens element L3, a biconcave fourth lens element L4, and a negative meniscus second lens element with a convex surface facing the object side.
  • the third lens element L3 and the fourth lens element L4 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesion between the third lens element L3 and the fourth lens element L4. Surface number 7 is given to the agent layer.
  • the fifth lens element L5 has two aspheric surfaces.
  • the third lens group G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side.
  • the sixth lens element L6 has two aspheric surfaces.
  • An aperture stop 1 (surface number 5 in the surface data in the corresponding numerical example described later) A1 is provided immediately on the object side of the third lens element L3, and immediately on the object side of the fifth lens element L5, An aperture stop 2 (surface number 10 in the surface data in the corresponding numerical example described later) A2 is provided.
  • the aperture stop 1A1 and the aperture stop 2A2 move on the optical axis integrally with the second lens group G2 during zooming from the wide-angle end to the telephoto end during imaging.
  • a parallel plate P is provided on the object side of the image plane S, that is, between the image plane S and the sixth lens element L6.
  • the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens group G2 moves toward the object side substantially monotonously.
  • the third lens group G3 moves to the image side substantially monotonously. That is, during zooming, all the lens groups are placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 changes and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
  • the third lens group G3 moves toward the object side along the optical axis.
  • the entire second lens group G2 By moving the entire second lens group G2 in a direction orthogonal to the optical axis, it is possible to correct image point movement due to vibration of the entire system. That is, when correcting the image point movement due to the vibration of the entire system, the entire second lens group G2 moves in a direction perpendicular to the optical axis, thereby suppressing the enlargement of the entire zoom lens system and making it compact. However, it is possible to optically correct image blur due to camera shake, vibration, etc. while maintaining excellent imaging characteristics with small decentration coma and decentering astigmatism.
  • the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a positive meniscus having a convex surface facing the object side.
  • the second lens element L2 having a shape. Among these, the second lens element L2 has two aspheric surfaces.
  • the second lens group G2 includes, in order from the object side to the image side, a biconvex third lens element L3, a biconcave fourth lens element L4, and a negative meniscus second lens element with a convex surface facing the object side.
  • the third lens element L3 and the fourth lens element L4 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesion between the third lens element L3 and the fourth lens element L4. Surface number 7 is given to the agent layer.
  • the fifth lens element L5 has two aspheric surfaces.
  • the third lens group G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side.
  • the sixth lens element L6 has two aspheric surfaces.
  • An aperture stop 1 (surface number 5 in the surface data in the corresponding numerical example described later) A1 is provided immediately on the object side of the third lens element L3, and immediately on the object side of the fifth lens element L5, An aperture stop 2 (surface number 10 in the surface data in the corresponding numerical example described later) A2 is provided.
  • the aperture stop 1A1 and the aperture stop 2A2 move on the optical axis integrally with the second lens group G2 during zooming from the wide-angle end to the telephoto end during imaging.
  • a parallel plate P is provided on the object side of the image plane S, that is, between the image plane S and the sixth lens element L6.
  • the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens group G2 moves toward the object side substantially monotonously.
  • the third lens group G3 moves to the image side substantially monotonously. That is, during zooming, all the lens groups are placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 changes and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
  • the third lens group G3 moves toward the object side along the optical axis.
  • the entire second lens group G2 By moving the entire second lens group G2 in a direction orthogonal to the optical axis, it is possible to correct image point movement due to vibration of the entire system. That is, when correcting the image point movement due to the vibration of the entire system, the entire second lens group G2 moves in a direction perpendicular to the optical axis, thereby suppressing the enlargement of the entire zoom lens system and making it compact. However, it is possible to optically correct image blur due to camera shake, vibration, etc. while maintaining excellent imaging characteristics with small decentration coma and decentering astigmatism.
  • the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a biconvex second lens element L2. It consists of.
  • the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesive layer between the first lens element L1 and the second lens element L2 is used. Surface number 2 is given.
  • the second lens element L2 has an aspheric image side surface.
  • the second lens group G2 includes, in order from the object side to the image side, a biconcave third lens element L3, a biconcave fourth lens element L4, and a positive meniscus second lens element with a convex surface facing the object side. 5 lens elements L5. Among these, the fourth lens element L4 has an aspheric object side surface.
  • the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a positive meniscus seventh lens element L7 with a convex surface facing the object side, and a convex surface facing the object side. And a negative meniscus eighth lens element L8.
  • the seventh lens element L7 and the eighth lens element L8 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesion between the seventh lens element L7 and the eighth lens element L8. Surface number 16 is given to the agent layer.
  • the sixth lens element L6 has two aspheric surfaces.
  • the fourth lens group G4 comprises solely a biconvex ninth lens element L9.
  • the ninth lens element L9 has two aspheric surfaces.
  • An aperture stop 1 (surface number 11 in the surface data in the corresponding numerical example described later) A1 is provided immediately on the object side of the sixth lens element L6, and immediately on the object side of the seventh lens element L7, An aperture stop 2 (surface number 14 in the surface data in the corresponding numerical example described later) A2 is provided.
  • the aperture stop 1A1 and the aperture stop 2A2 move on the optical axis integrally with the third lens group G3 during zooming from the wide-angle end to the telephoto end during imaging.
  • a parallel plate P is provided on the object side of the image plane S, that is, between the image plane S and the ninth lens element L9.
  • the first lens group G1 moves to the object side substantially monotonously, and the second lens group G2 slightly draws a slightly convex locus on the object side.
  • the third lens group G3 moves toward the object side with a convex locus on the object side, and the fourth lens group G4 moves toward the image side substantially monotonously. That is, during zooming, the distance between the first lens group G1 and the second lens group G2 changes, the distance between the second lens group G2 and the third lens group G3 changes, and the third lens group G3 and the fourth lens. All the lens groups move along the optical axis so that the distance from the group G4 increases.
  • the third lens group G3 moves toward the object side along the optical axis.
  • the entire third lens group G3 By moving the entire third lens group G3 in a direction perpendicular to the optical axis, it is possible to correct image point movement due to vibration of the entire system. That is, when correcting the image point movement due to the vibration of the entire system, the entire third lens group G3 moves in a direction perpendicular to the optical axis, thereby suppressing the enlargement of the entire zoom lens system and making it compact. However, it is possible to optically correct image blur due to camera shake, vibration, etc. while maintaining excellent imaging characteristics with small decentration coma and decentering astigmatism.
  • the first lens group G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface facing the object side, and a biconvex second lens element L2. It consists of.
  • the first lens element L1 and the second lens element L2 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesive layer between the first lens element L1 and the second lens element L2 is used. Surface number 2 is given.
  • the second lens element L2 has an aspheric image side surface.
  • the second lens group G2 includes, in order from the object side to the image side, a biconcave third lens element L3, a biconcave fourth lens element L4, and a positive meniscus second lens element with a convex surface facing the object side. 5 lens elements L5. Among these, the fourth lens element L4 has an aspheric object side surface.
  • the third lens group G3 includes, in order from the object side to the image side, a biconvex sixth lens element L6, a positive meniscus seventh lens element L7 with a convex surface facing the object side, and a convex surface facing the object side. And a negative meniscus eighth lens element L8.
  • the seventh lens element L7 and the eighth lens element L8 are cemented, and in the surface data in the corresponding numerical value example described later, the adhesion between the seventh lens element L7 and the eighth lens element L8. Surface number 16 is given to the agent layer.
  • the sixth lens element L6 has two aspheric surfaces.
  • the fourth lens group G4 comprises solely a biconvex ninth lens element L9.
  • the ninth lens element L9 has two aspheric surfaces.
  • An aperture stop 1 (surface number 11 in the surface data in the corresponding numerical example described later) A1 is provided immediately on the object side of the sixth lens element L6, and immediately on the object side of the seventh lens element L7, An aperture stop 2 (surface number 14 in the surface data in the corresponding numerical example described later) A2 is provided.
  • the aperture stop 1A1 and the aperture stop 2A2 move on the optical axis integrally with the third lens group G3 during zooming from the wide-angle end to the telephoto end during imaging.
  • a parallel plate P is provided on the object side of the image plane S, that is, between the image plane S and the ninth lens element L9.
  • the first lens group G1 moves to the object side substantially monotonously, and the second lens group G2 slightly draws a slightly convex locus on the object side.
  • the third lens group G3 moves toward the object side with a convex locus on the object side, and the fourth lens group G4 moves toward the image side substantially monotonously. That is, during zooming, the distance between the first lens group G1 and the second lens group G2 changes, the distance between the second lens group G2 and the third lens group G3 changes, and the third lens group G3 and the fourth lens. All the lens groups move along the optical axis so that the distance from the group G4 increases.
  • the third lens group G3 moves toward the object side along the optical axis.
  • the entire third lens group G3 By moving the entire third lens group G3 in a direction perpendicular to the optical axis, it is possible to correct image point movement due to vibration of the entire system. That is, when correcting the image point movement due to the vibration of the entire system, the entire third lens group G3 moves in a direction perpendicular to the optical axis, thereby suppressing the enlargement of the entire zoom lens system and making it compact. However, it is possible to optically correct image blur due to camera shake, vibration, etc. while maintaining excellent imaging characteristics with small decentration coma and decentering astigmatism.
  • a zoom lens system such as the zoom lens systems according to Embodiments 1 to 4 includes at least two aperture stops, and at least one lens element is disposed between the at least two aperture stops. Then, during zooming from the wide-angle end to the telephoto end during imaging, one of these at least two aperture stops is selected and the amount of light is adjusted according to the zoom position. That is, in the zoom lens system according to the present disclosure, at the time of zooming, one aperture stop selected from a plurality of aperture stops so that an image having a desired brightness can be formed at that zoom position. The light quantity is adjusted by one aperture stop selected from a plurality of aperture stops so that an image having a desired brightness can be formed at another zoom position.
  • the zoom lens system according to the present disclosure includes at least two aperture stops that can contribute to the F-number. Therefore, the light amount can be appropriately adjusted according to the zoom position, and the zoom position can be adjusted according to the zoom position. An image having a desired brightness can be formed.
  • the zoom lens system was selected at the wide-angle end during zooming from the wide-angle end to the telephoto end during imaging, as shown in various data in the corresponding numerical examples described later.
  • the aperture stop is different from the aperture stop selected at the telephoto end.
  • the aperture stop 1A1 is selected so that the F-number is small at the wide-angle end, that is, the amount of light is large and a bright image is formed, and the F-number is large at the telephoto end. That is, the aperture stop 2A2 is selected so that the amount of light is small and a dark image is formed compared to the wide-angle end.
  • Each lens group constituting the zoom lens system according to Embodiments 1 to 4 includes a refractive lens element that deflects incident light by refraction (that is, a type in which deflection is performed at an interface between media having different refractive indexes)
  • a diffractive lens element that deflects incident light by diffraction a refractive / diffractive hybrid lens element that deflects incident light by a combination of diffraction and refraction, and a refractive index that deflects incident light by the refractive index distribution in the medium
  • Each lens group may be composed of a distributed lens element or the like.
  • a diffractive / diffractive hybrid lens element forming a diffractive structure at the interface of media having different refractive indexes is advantageous because the wavelength dependency of diffraction efficiency is improved.
  • Embodiments 1 to 4 have been described as examples of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.
  • FIG. 9 is a schematic configuration diagram of a digital still camera according to the fifth embodiment.
  • the digital still camera includes an image pickup apparatus including a zoom lens system 1 and an image pickup device 2 that is a CCD, a liquid crystal monitor 3, and a housing 4.
  • the zoom lens system 1 includes a first lens group G1, a second lens group G2 including an aperture stop 1A1 and an aperture stop 2A2, and a third lens group G3.
  • the zoom lens system 1 is disposed on the front side, and the imaging element 2 is disposed on the rear side of the zoom lens system 1.
  • a liquid crystal monitor 3 is disposed on the rear side of the housing 4, and an optical image of the subject by the zoom lens system 1 is formed on the image plane S.
  • the lens barrel is composed of a main lens barrel 5, a movable lens barrel 6, and a cylindrical cam 7.
  • the first lens group G1, the aperture stop 1A1, the aperture stop 2A2, the second lens group G2, and the third lens group G3 move to predetermined positions with the image sensor 2 as a reference, and a wide angle. Zooming from the end to the telephoto end can be performed.
  • the third lens group G3 is movable in the optical axis direction by a focus adjustment motor.
  • any of the zoom lens systems according to the second to fourth embodiments may be used instead of the zoom lens system according to the first embodiment.
  • the optical system of the digital still camera shown in FIG. 9 can be used for a digital video camera for moving images. In this case, not only a still image but also a moving image with high resolution can be taken.
  • the zoom lens system according to the first to fourth embodiments is shown as the zoom lens system 1, but these zoom lens systems do not use the entire zooming area. May be. That is, a range in which the optical performance is ensured may be cut out according to a desired zooming area, and used as a zoom lens system having a lower magnification than the zoom lens system described in the first to fourth embodiments.
  • the zoom lens system is applied to a so-called collapsible lens barrel
  • a prism having an internal reflection surface or a surface reflection mirror may be disposed at an arbitrary position such as in the first lens group G1, and the zoom lens system may be applied to a so-called bent lens barrel.
  • a part of the lens groups constituting the zoom lens system such as the entire second lens group G2 and a part of the second lens group G2 are retracted from the optical axis when retracted.
  • a zoom lens system may be applied to the sliding lens barrel.
  • the fifth embodiment has been described as an example of the technique disclosed in the present application.
  • the technology in the present disclosure is not limited to this, and can also be applied to an embodiment in which changes, replacements, additions, omissions, and the like are appropriately performed.
  • an image pickup apparatus including the zoom lens system according to Embodiments 1 to 4 described above and an image pickup device such as a CCD or a CMOS is used as a camera for a portable information terminal such as a smartphone, a monitoring camera for a monitoring system, a Web
  • an image pickup apparatus including the zoom lens system according to Embodiments 1 to 4 described above and an image pickup device such as a CCD or a CMOS is used as a camera for a portable information terminal such as a smartphone, a monitoring camera for a monitoring system, a Web
  • the present invention can also be applied to cameras, in-vehicle cameras, and the like.
  • the unit of length in the table is “mm”, and the unit of angle of view is “°”.
  • r is a radius of curvature
  • d is a surface interval
  • nd is a refractive index with respect to the d line
  • vd is an Abbe number with respect to the d line
  • the diameters of the diaphragm 1 and the diaphragm 2 are effective diameters.
  • the surface marked with * is an aspherical surface, and the aspherical shape is defined by the following equation.
  • Z distance from a point on the aspheric surface having a height h from the optical axis to the tangent plane of the aspheric vertex
  • h height from the optical axis
  • r vertex radius of curvature
  • ⁇ conic constant
  • An n-order aspherical coefficient.
  • each longitudinal aberration diagram shows the aberration at the wide angle end, (b) shows the intermediate position, and (c) shows the aberration at the telephoto end.
  • SA spherical aberration
  • AST mm
  • DIS distortion
  • the vertical axis represents the F number (indicated by F in the figure)
  • the solid line is the d line (d-line)
  • the short broken line is the F line (F-line)
  • the long broken line is the C line (C- line).
  • the vertical axis represents the image height (indicated by H in the figure), the solid line represents the sagittal plane (indicated by s), and the broken line represents the meridional plane (indicated by m in the figure). is there.
  • the vertical axis represents the image height (indicated by H in the figure).
  • the present disclosure can be applied to digital input devices such as digital cameras, cameras of portable information terminals such as smartphones, surveillance cameras in surveillance systems, Web cameras, and in-vehicle cameras.
  • digital input devices such as digital cameras, cameras of portable information terminals such as smartphones, surveillance cameras in surveillance systems, Web cameras, and in-vehicle cameras.
  • the present disclosure can be applied to a photographing optical system that requires high image quality, such as a digital camera.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
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  • Adjustment Of Camera Lenses (AREA)

Abstract

La présente invention porte sur un système de lentille zoom qui : a une pluralité de groupes de lentilles configurés à partir d'un ou plusieurs éléments de lentille ; comporte au moins deux diaphragmes ; a un ou plusieurs éléments de lentille positionnés entre les au moins deux diaphragmes ; et est caractérisé en ce que lors d'une variation de focale depuis une extrémité grand angle vers une extrémité télescopique durant une imagerie, la quantité de lumière est ajustée par sélection de l'un des au moins deux diaphragmes selon la position de zoom.
PCT/JP2012/008241 2012-01-13 2012-12-25 Système de lentille zoom, dispositif d'imagerie et caméra WO2013105190A1 (fr)

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JP2012005152A JP2013145286A (ja) 2012-01-13 2012-01-13 ズームレンズ系、撮像装置及びカメラ

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EP3125011B1 (fr) 2014-03-27 2019-08-28 Nikon Corporation Système optique à puissance variable, dispositif d'imagerie, et procédé de fabrication de système optique à puissance variable
JP6507479B2 (ja) * 2014-03-27 2019-05-08 株式会社ニコン 変倍光学係および撮像装置
KR102595462B1 (ko) * 2018-04-04 2023-10-30 삼성전기주식회사 줌 광학계

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US11604338B2 (en) 2016-01-26 2023-03-14 Samsung Electro-Mechanics Co., Ltd. Zoom optical system
US11953663B2 (en) 2016-01-26 2024-04-09 Samsung Electro-Mechanics Co., Ltd. Zoom optical system

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