WO2010001545A1 - ズームレンズ系、撮像装置及びカメラ - Google Patents
ズームレンズ系、撮像装置及びカメラ Download PDFInfo
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- WO2010001545A1 WO2010001545A1 PCT/JP2009/002852 JP2009002852W WO2010001545A1 WO 2010001545 A1 WO2010001545 A1 WO 2010001545A1 JP 2009002852 W JP2009002852 W JP 2009002852W WO 2010001545 A1 WO2010001545 A1 WO 2010001545A1
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- lens
- lens group
- zoom lens
- positive power
- zoom
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/177—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a negative front lens or group of lenses
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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
- G02B15/1445—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
- G02B15/144515—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 system, an imaging device, and a camera.
- the present invention not only has high resolution, but is sufficiently adapted not only to a short optical total length (lens total length) but also to wide-angle shooting at an angle of view of 70 ° or more at the wide-angle end.
- the present invention relates to a zoom lens system having a large aperture with an F number of about 2.0, an imaging device including the zoom lens system, and a thin and extremely compact camera including the imaging device.
- zoom lens system having a wide-angle end with a short focal length and a large angle of view.
- a zoom lens system having a short focal length at the wide-angle end and a large angle of view a first lens group having a negative power and a second lens group having a positive power in order from the object side to the image side
- zoom lens systems of a negative lead type four lens unit configuration in which a third lens unit having a positive power and a fourth lens unit having a positive power are arranged have been proposed.
- Japanese Patent No. 3805212 has at least two lens groups of a first lens group of negative refractive power and a second lens group of positive refractive power in order from the object side, and the telephoto end with respect to the wide angle end
- the zoom lens performs zooming by moving the second lens group to the object side so that the distance between the first lens group and the second lens group becomes smaller.
- a zoom lens consisting of two lenses of a negative lens having a spherical surface and a positive lens.
- a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power are sequentially arranged from the object side.
- the distance between the first and second lens groups is reduced, and the distance between the second and third lens groups is reduced.
- the second lens group has a fixed distance on the optical axis of each lens constituting the lens group, and the second lens group is moved in the direction of the image plane to move from a long distance object to a near distance object.
- Japanese Patent No. 3943922 has a first lens group having a negative refractive power, a second lens group having a positive refractive power, a third lens group having a positive refractive power, and a positive lens in order from the object side.
- a zoom lens comprising a fourth lens group having a refractive power is disclosed.
- the zoom lens disclosed in Japanese Patent No. 3943922 has a negative lens with an aspheric concave surface facing the aperture stop side of the first lens group of negative power, and the aspheric surface has a refractive power on the optical axis. On the other hand, the refractive power becomes weaker toward the outside.
- Japanese Patent Application Laid-Open No. 2001-188172 discloses, in order from the screen side to the original side, the first lens group of negative refractive power and the second lens of positive refractive power.
- a retro lens having a lens unit, a third lens unit of positive refracting power, and a fourth lens unit of positive refracting power, and in which the entire lens length of the entire system is longest at the telephoto end during zooming from the wide-angle end to the telephoto end.
- a focus type zoom lens is disclosed.
- the zoom lens system described in each of the patent documents can not satisfy recent requirements in terms of achieving both wide-angle and compact.
- the zoom lens system described in each patent document can not satisfy the demand for recent high specs also in terms of F number.
- the object of the present invention is not only to have high resolution but also to be sufficiently adapted to wide-angle shooting with an angle of view of 70 ° or more at the wide-angle end as well as a short total optical length (lens total length). It is an object of the present invention to provide a zoom lens system having a large aperture with an F number of about 2.0, an image pickup apparatus including the zoom lens system, and a thin and extremely compact camera provided with the image pickup apparatus.
- zoom lens system In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes, The following conditions (I-1): 2 ⁇ W / F W 34 34 (I-1) (However, f T / f W > 2.0) (here, ⁇ W : Half angle of view (°) at wide angle end, F W : F-number at the wide-angle end, f T : focal length of the entire system at the telephoto end, f W is related to a zoom lens system which satisfies the focal length of the entire system at the wide angle end).
- the present invention An imaging device capable of outputting an optical image of an object as an electrical image signal, A zoom lens system that forms an optical image of an object; An imaging device for converting an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups,
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups,
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists
- the imaging apparatus includes: a zoom lens system that forms an optical image of an object; and an imaging device that converts the optical image formed by the zoom lens system into an electrical image signal.
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes, The following conditions (I-1): 2 ⁇ W / F W 34 34 (I-1) (However, f T / f W > 2.0) (here, ⁇ W : Half angle of view (°) at wide angle end, F W : F-number at the wide-angle end, f T : focal length of the entire system at the telephoto end, f w is a zoom lens system that satisfies the focal length of the entire system at the wide angle end).
- the zoom lens system In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes,
- the first lens unit includes, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power, The following conditions (II-1) and (II-2): n d1 P > 1.85 ⁇ ⁇ ⁇ (II-1) d d1 P ⁇ 35 ⁇ ⁇ ⁇ (II-2) (However, ⁇ W > 35) (here, n d1 P : refractive index to the d-line of the first lens element, d d1 P : Abbe's number for the d-line of the first lens element,
- the present invention An imaging device capable of outputting an optical image of an object as an electrical image signal, A zoom lens system that forms an optical image of an object; An imaging device for converting an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes,
- the first lens unit includes, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power,
- the imaging apparatus includes: a zoom lens system that forms an optical image of an object; and an imaging device that converts the optical image formed by the zoom lens system into an electrical image signal.
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes,
- the first lens unit includes, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power, The following conditions (II-1) and (II-2): n d1 P > 1.85 ⁇ ⁇ ⁇ (II-1) d d1 P ⁇ 35 ⁇ ⁇ ⁇ (II-2) (However, ⁇ W > 35) (here, n d1 P : refractive index to the d-line of the first lens element, d d1 P : Abbe's number for the d-line of the first lens element, ⁇ W : Half angle of view (°) at the wide angle end
- the zoom lens system In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes,
- the first lens unit includes, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power,
- the present invention An imaging device capable of outputting an optical image of an object as an electrical image signal, A zoom lens system that forms an optical image of an object; An imaging device for converting an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes,
- the first lens unit includes, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power,
- III-1 ⁇ W > 35 ⁇ ⁇ ⁇ (III-1) (However, f T / f W > 2.0) (here, ⁇ W : Half angle of view (°) at wide angle end, f T : focal length
- the imaging apparatus includes: a zoom lens system that forms an optical image of an object; and an imaging device that converts the optical image formed by the zoom lens system into an electrical image signal.
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes,
- the first lens unit includes, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power,
- III-1 ⁇ W > 35 ⁇ ⁇ ⁇ (III-1) (However, f T / f W > 2.0) (here, ⁇ W : Half angle of view (°) at wide angle end, f T : focal length of the entire system at the telephoto end, f w is a zoom lens system that satisfies the focal length of the entire system at the wide angle end).
- the zoom lens system In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes,
- the first lens unit includes, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power,
- the present invention relates to a zoom lens system in which an aperture stop is between the second lens group and the third lens group.
- the present invention An imaging device capable of outputting an optical image of an object as an electrical image signal, A zoom lens system that forms an optical image of an object; An imaging device for converting an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes,
- the first lens unit includes, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power,
- the present invention relates to an imaging device in which an aperture stop is a zoom lens system located between the second lens group and the third lens group.
- the imaging apparatus includes: a zoom lens system that forms an optical image of an object; and an imaging device that converts the optical image formed by the zoom lens system into an electrical image signal.
- the zoom lens system is In order from the object side to the image side, a first lens group having a negative power, a second lens group having a positive power, a third lens group having a positive power, and a fourth lens having a positive power Consists of groups, During zooming, the distance between the lens units changes,
- the first lens unit includes, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power,
- the present invention relates to a camera in which an aperture stop is a zoom lens system located between the second lens group and the third lens group.
- the present invention is sufficiently adaptable to wide-angle photography having a high resolution, a short optical total length (lens total length), and an angle of view of 70 ° or more at the wide-angle end.
- FIG. 1 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 1 (Example 1).
- FIG. 2 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 1.
- FIG. 3 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 1.
- FIG. 4 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 2 (Example 2).
- FIG. 5 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 2.
- FIG. 6 is a lateral aberration diagram in a basic state in which image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 2.
- FIG. 7 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 3 (Example 3).
- FIG. 8 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 3.
- FIG. FIG. 9 is a lateral aberration diagram in a basic state where image blurring correction is not performed and in an image blurring correction state at a telephoto limit of a zoom lens system according to Example 3.
- FIG. 10 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 4 (Example 4).
- FIG. 11 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 4.
- FIG. 12 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 4.
- FIG. 13 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 5 (Example 5).
- FIG. 14 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 5.
- FIG. 15 is a lateral aberration diagram in a basic state in which image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 5.
- FIG. 16 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 6 (Example 6).
- FIG. 17 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 6.
- FIG. FIG. 18 is a lateral aberration diagram in a basic state where image blurring correction is not performed and in an image blurring correction state at a telephoto limit of a zoom lens system according to Example 6.
- FIG. 19 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 7 (Example 7).
- FIG. 20 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 7.
- FIG. 21 is a lateral aberration diagram in a basic state in which image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 7.
- FIG. 22 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 8 (Example 8).
- FIG. 23 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 8.
- FIG. 24 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 8.
- FIG. 25 is a schematic block diagram of a digital still camera according to the ninth embodiment.
- FIG. 26 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 10 (Example 10).
- FIG. 27 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 10.
- FIG. FIG. 28 is a lateral aberration diagram in a basic state in which image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 10.
- FIG. 29 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 11 (Example 11).
- FIG. 30 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 11.
- FIG. 31 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 11.
- FIG. 32 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 12 (Example 12).
- FIG. 33 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 12.
- FIG. 34 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 12.
- FIG. 35 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 13 (Example 13).
- FIG. 36 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 13.
- FIG. FIG. 37 is a lateral aberration diagram at a telephoto limit of a zoom lens system according to Example 13 in a basic state in which image blur correction is not performed and in an image blur correction state.
- FIG. 38 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 14 (Example 14).
- FIG. 39 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example 14.
- FIG. 40 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at a telephoto limit of a zoom lens system according to Example 14.
- FIG. 41 is a schematic block diagram of a digital still camera according to the fifteenth embodiment.
- FIGS. 1, 4, 7, 10, 13, 16, 19 and 22 are lens arrangement diagrams of zoom lens systems according to Embodiments 1 to 8, respectively.
- FIGS. 1, 4, 7, 10, 13, 16, 19 and 22 represents a zoom lens system in focus at infinity.
- the lens configuration of T 1 )) and the lens configuration of the telephoto end (longest focal length state: focal length f T ) are shown in FIG.
- straight or curved arrows provided between (a) and (b) show the movement of each lens group from the wide-angle end to the telephoto end via the intermediate position.
- the arrow attached to the lens unit represents focusing from an infinity in-focus condition to a close-object in-focus condition. That is, the moving direction at the time of focusing from an infinity in-focus condition to a close-object in-focus condition is shown.
- the zoom lens system according to each embodiment includes, in order from the object side to the image side, a first lens group G1 having negative power, a second lens group G2 having positive power, and a second lens group G2 having positive power. 3 lens group G3 and a fourth lens group having a positive power, and during zooming, an interval between each lens group, that is, an interval between the first lens group and a second lens group, a second lens group and a second lens group Each lens group is moved in the direction along the optical axis such that the distance between the third lens group and the distance between the third lens group and the fourth lens group are all changed.
- the zoom lens system according to each embodiment enables downsizing of the entire lens system while maintaining high optical performance by arranging the respective lens units in a desired power arrangement.
- an asterisk * attached to a specific surface indicates that the surface is aspheric.
- the symbol (+) and the symbol (-) attached to the symbols of the respective lens units correspond to the symbols of the powers of the respective lens units.
- the straight line described on the right side represents the position of the image surface S, and on the object side of the image surface S (between the image surface S and the most image side lens surface of the fourth lens group G4) Is provided with a parallel plate P equivalent to an optical low pass filter, a face plate of an imaging device, and the like.
- an aperture stop A is provided on the object side of the second lens group G2 (between the most image side lens surface of the first lens group G1 and the most object side lens surface of the second lens group G2).
- the aperture stop A moves integrally with the second lens group G2 on the optical axis during zooming from the wide-angle end to the telephoto end during imaging.
- the object side of the third lens group G3 (the most image side lens surface of the second lens group G2 and the most object side lens surface of the third lens group G3 ) Is provided, and the aperture stop A moves on the optical axis integrally with the third lens group G3 during zooming from the wide-angle end to the telephoto end at the time of imaging Do.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has both aspheric surfaces, and the second lens element L2 has an aspheric object side surface.
- the second lens unit G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 having a convex surface facing the object, and a biconvex third lens element L3. It consists of a four-lens element L4 and a bi-concave fifth lens element L5. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 has a biconvex sixth lens element L6 and a negative meniscus lens having a convex surface facing the object, in order from the object side to the image side. And the seventh lens element L7.
- the sixth lens element L6 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a positive meniscus eighth lens element L8 with the convex surface facing the object side. Both surfaces of the eighth lens element L8 are aspheric.
- the zoom lens system according to Embodiment 1 at the time of zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side with the aperture stop A, and both the third lens group G3 and the fourth lens group G4 move to the object side.
- each lens group moves along the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface
- the second lens element L2 has an aspheric object side.
- the second lens unit G2 is composed of, in order from the object side to the image side, a biconvex third lens element L3 and a biconcave fourth lens element L4. .
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex fifth lens element L5 and a biconvex sixth lens element L6. And a biconcave seventh lens element L7. Among these, the sixth lens element L6 and the seventh lens element L7 are cemented.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a biconvex eighth lens element L8.
- the eighth lens element L8 has an aspheric image side surface.
- the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, during zooming, each lens group moves along the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface
- the second lens element L2 has an aspheric object side.
- the second lens unit G2 is composed of a biconvex third lens element L3 and a biconcave fourth lens element L4 in order from the object side to the image side.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex fifth lens element L5 and a biconvex sixth lens element L6. And a biconcave seventh lens element L7. Among these, the sixth lens element L6 and the seventh lens element L7 are cemented.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a biconvex eighth lens element L8.
- the eighth lens element L8 has an aspheric image side surface.
- the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, during zooming, each lens group moves along the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface.
- the second lens unit G2 in order from the object side to the image side, has a positive meniscus third lens element L3 with the convex surface facing the object side, and a convex surface on the object side It consists of the 4th lens element L4 of the negative meniscus shape which turned.
- the third lens element L3 and the fourth lens element L4 are cemented.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex fifth lens element L5 and a biconvex sixth lens element L6. And a biconcave seventh lens element L7. Among these, the sixth lens element L6 and the seventh lens element L7 are cemented.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a positive meniscus eighth lens element L8 with the convex surface facing the object side.
- the eighth lens element L8 has an aspheric image side surface.
- the zoom lens system according to Embodiment 4 when zooming from the wide-angle end to the telephoto end at the time of imaging, the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, during zooming, each lens group moves along the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface.
- the second lens unit G2 in order from the object side to the image side, has a positive meniscus third lens element L3 with the convex surface facing the object side, and a convex surface on the object side It consists of the 4th lens element L4 of the negative meniscus shape which turned.
- the third lens element L3 and the fourth lens element L4 are cemented.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex fifth lens element L5 and a biconvex sixth lens element L6. And a biconcave seventh lens element L7. Among these, the sixth lens element L6 and the seventh lens element L7 are cemented.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a positive meniscus eighth lens element L8 with the convex surface facing the object side.
- the eighth lens element L8 has an aspheric image side surface.
- the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, during zooming, each lens group moves along the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface.
- the second lens unit G2 is composed, in order from the object side to the image side, of a biconvex third lens element L3 and a biconcave fourth lens element L4. .
- the third lens element L3 and the fourth lens element L4 are cemented, and in the surface data in the corresponding numerical example to be described later, in the adhesive layer between the third lens element L3 and the fourth lens element L4. Face number 6 is assigned.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex fifth lens element L5 and a biconvex sixth lens element L6. And a biconcave seventh lens element L7.
- the sixth lens element L6 and the seventh lens element L7 are cemented, and in the surface data in the corresponding numerical example to be described later, the adhesion between the sixth lens element L6 and the seventh lens element L7 Surface number 13 is given to the agent layer.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a positive meniscus eighth lens element L8 with the convex surface facing the object side.
- the eighth lens element L8 has an aspheric image side surface.
- the zoom lens system according to Embodiment 6 when zooming from the wide-angle end to the telephoto end at the time of imaging, the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, at the time of zooming from the wide angle end to the telephoto end at the time of imaging, each lens group moves along the optical axis such that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface.
- the second lens unit G2 is composed, in order from the object side to the image side, of a biconvex third lens element L3 and a biconcave fourth lens element L4. .
- the third lens element L3 and the fourth lens element L4 are cemented, and in the surface data in the corresponding numerical example to be described later, in the adhesive layer between the third lens element L3 and the fourth lens element L4. Face number 6 is assigned.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 has a biconvex fifth lens element L5 and a biconvex sixth lens element L6 in this order from the object side to the image side. And a biconcave seventh lens element L7.
- the sixth lens element L6 and the seventh lens element L7 are cemented, and in the surface data in the corresponding numerical example to be described later, the adhesion between the sixth lens element L6 and the seventh lens element L7 Surface number 13 is given to the agent layer.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a biconvex eighth lens element L8.
- the eighth lens element L8 has an aspheric image side surface.
- the first lens group G1 draws a locus convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, at the time of zooming from the wide angle end to the telephoto end at the time of imaging, each lens group moves along the optical axis such that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface.
- the second lens unit G2 in order from the object side to the image side, has a positive meniscus third lens element L3 with the convex surface facing the object side, and a convex surface on the object side It consists of the 4th lens element L4 of the negative meniscus shape which turned.
- the third lens element L3 and the fourth lens element L4 are cemented, and in the surface data in the corresponding numerical example to be described later, in the adhesive layer between the third lens element L3 and the fourth lens element L4. Face number 6 is assigned.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 has a biconvex fifth lens element L5 and a biconvex sixth lens element L6 in this order from the object side to the image side. And a biconcave seventh lens element L7.
- the sixth lens element L6 and the seventh lens element L7 are cemented, and in the surface data in the corresponding numerical example to be described later, the adhesion between the sixth lens element L6 and the seventh lens element L7 Surface number 13 is given to the agent layer.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a biconvex eighth lens element L8.
- the eighth lens element L8 has an aspheric image side surface.
- the zoom lens system according to Embodiment 8 when zooming from the wide-angle end to the telephoto end at the time of imaging, the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, at the time of zooming from the wide angle end to the telephoto end at the time of imaging, each lens group moves along the optical axis such that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 includes, in order from the object side to the image side, a first lens element L1 having a negative power, and a second lens unit having a positive power. Since the lens element L2 and the lens element L2 are used, it is possible to realize a short optical total length (lens total length) while satisfactorily correcting various aberrations, in particular distortion at the wide-angle end.
- the first lens unit G1 includes at least one lens element having an aspheric surface, aberration, particularly distortion at the wide-angle end, can be corrected even better. Can.
- the fourth lens unit G4 is configured of a single lens element, the total number of lens elements is reduced, and a lens system having a short optical total length (lens total length) It has become.
- one lens element constituting the fourth lens unit G4 includes an aspheric surface, it is possible to correct the aberration more satisfactorily.
- the second lens unit G2 positioned immediately on the image side of the aperture stop A is configured of three lens elements including one cemented lens element therein.
- the second lens group G2 has a small thickness and a short optical total length (lens total length).
- the third lens unit G3 located immediately on the image side of the aperture stop A is constituted by three lens elements including one cemented lens element in the third lens unit G3. Therefore, the thickness of the third lens group G3 is small, and the total optical length (lens total length) is short.
- the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens are provided during zooming from the wide-angle end to the telephoto end during imaging.
- the zooming operation is performed by moving the group G4 along the optical axis, and one of the first lens group G1, the second lens group G2, the third lens group G3 and the fourth lens group G4, Alternatively, the image point movement due to the vibration of the entire system is corrected by moving a part of the sub lens units of each lens group in the direction orthogonal to the optical axis, that is, the image blurring due to camera shake, vibration etc. Can be corrected.
- the third lens group G3 moves in the direction orthogonal to the optical axis, thereby suppressing the enlargement of the entire zoom lens system and making it compact.
- Image blur correction can be performed while maintaining excellent imaging characteristics with small decentering coma and decentering astigmatism.
- one lens unit is composed of a plurality of lens elements
- one of the lens elements of the plurality of lens elements or ones adjacent to each other is referred to as a part of the sub lens unit of each lens unit. It refers to multiple lens elements.
- a first lens unit having negative power, a second lens unit having positive power, and positive power And a fourth lens group having a positive power, and the distance between the lens groups changes during zooming (hereinafter, this lens configuration is referred to as a basic configuration I of the embodiment)
- the lens system satisfies the following condition (I-1).
- the condition (I-1) defines the ratio of the half angle of view to the f-number at the wide angle end. If the condition (I-1) is not satisfied, the half angle of view is too small or the F number is too large, and a large aperture zoom lens system compatible with wide angle shooting can not be achieved.
- the zoom lens system having the basic configuration I satisfy the following condition (I-2). 1.0 ⁇
- the condition (I-2) defines an appropriate focal length of the first lens group.
- the value exceeds the upper limit of the condition (I-2) the focal length of the first lens group that bears all the negative powers of the entire system becomes too large, so that the basic zooming function as a zoom lens system can be achieved. It will be difficult. If the value exceeds the upper limit of the condition (I-2), even if the zooming function can be achieved, the ability to correct the occurrence of distortion and astigmatism is extremely insufficient, so that sufficient optical performance can be ensured. It will be difficult.
- the focal length of the first lens group becomes too small conversely, so distortion aberration generated in the first lens group is regarded as the first lens group or another lens group. While it becomes difficult to correct with the provided aspheric surface, the fluctuation of off-axis aberrations such as distortion aberration and coma aberration during zooming becomes too large, and it becomes difficult to secure sufficient optical performance.
- the zoom lens system is composed of two lens elements of a first lens element having a power of and a second lens element having a positive power (hereinafter, this lens configuration is referred to as a basic configuration II of the embodiment), The following conditions (II-1) and (II-2) are satisfied.
- n d1 P > 1.85 ⁇ ⁇ ⁇ (II-1) d d1 P ⁇ 35 ⁇ ⁇ ⁇ (II-2) (However, ⁇ W > 35) here, n d1 P : refractive index to the d-line of the first lens element, d d1 P : Abbe's number for the d-line of the first lens element, ⁇ W : Half angle of view (°) at the wide angle end It is.
- the conditions (II-1) and (II-2) set forth the optical constants of the first lens element having negative power included in the first lens unit. If the conditions (II-1) and (II-2) are not satisfied at the same time, it becomes extremely difficult to correct distortion aberration and lateral chromatic aberration generated in the first lens group, and for this correction, the first lens group Can not be composed of two lens elements. Therefore, a compact zoom lens system can not be achieved while maintaining optical performance for the required specifications.
- the zoom lens system having the basic configuration I or the basic configuration II and in which the fourth lens unit moves in the direction along the optical axis during zooming It is preferable to satisfy the condition (I, II-3) of 0.07 ⁇
- the condition (I, II-3) defines the amount of movement of the fourth lens unit.
- the value exceeds the upper limit of the condition (I, II-3) the amount of movement of the fourth lens unit becomes too large, which makes it difficult to achieve a compact zoom lens system.
- the value goes below the lower limit of the condition (I, II-3) the amount of movement of the fourth lens unit becomes too small, which makes it difficult to correct aberrations which fluctuate during zooming, which is not preferable.
- the zoom lens system having the basic configuration I or the basic configuration II satisfy the following conditions (I, II-4).
- I, II-4 1.5 ⁇ f G4 / f W ⁇ 10.0 (I, II-4) (However, f T / f W > 2.0) here, f G4 : Focal length of the fourth lens unit, f T : focal length of the entire system at the telephoto end, f W is the focal length of the entire system at the wide angle end.
- the condition (I, II-4) defines the focal length of the fourth lens unit.
- the focal length of the fourth lens unit becomes too large, and it becomes difficult to secure the ambient light illuminance on the image plane.
- the focal length of the fourth lens unit becomes too small, which makes it difficult to correct aberration generated by the fourth lens unit, in particular spherical aberration.
- the zoom lens system having the basic configuration I or the basic configuration II satisfy the following conditions (I, II-5).
- the condition (I, II-5) defines the lateral magnification of the fourth lens group at the wide-angle end, and is a condition relating to back focus. If the condition (I, II-5) is not satisfied, the lateral magnification of the fourth lens unit disposed closest to the image side becomes large, so the back focus becomes too long, and a compact zoom lens system is achieved. Will be difficult.
- the zoom lens system having the basic configuration II satisfy the following condition (II-6). 0.5 ⁇ f L1 / f G1 ⁇ 0.8 (II-6) here, f L1 : focal length of the first lens element, f G1 is the focal length of the first lens group.
- the condition (II-6) sets forth the focal length of the first lens element of the first lens unit.
- the value exceeds the upper limit of the condition (II-6) the focal length of the first lens element becomes too large, which makes it difficult to correct distortion particularly at the wide-angle end, and the moving amount of the first lens unit in zooming is also large. This makes it difficult to achieve a compact zoom lens system.
- the value goes below the lower limit of the condition (II-6) the focal length of the first lens element becomes too small, which makes it difficult to correct distortion particularly at the wide-angle end.
- the zoom lens system having the basic configuration II satisfy the following condition (II-7).
- the condition (II-7) sets forth the focal length of the second lens element of the first lens unit.
- the value exceeds the upper limit of the condition (II-7) the focal length of the second lens element becomes too large, which makes it difficult to correct distortion particularly at the wide-angle end, and the moving amount of the first lens unit in zooming is also large. This makes it difficult to achieve a compact zoom lens system.
- the value goes below the lower limit of the condition (II-7) the focal length of the second lens element becomes too small, which makes it difficult to correct distortion particularly at the wide-angle end.
- the zoom lens system having the basic configuration II satisfy the following condition (II-8). 0.15 ⁇
- the condition (II-8) sets forth the ratio of the focal length of the first lens element of the first lens unit to the second lens element. If the upper limit of the condition (II-8) is exceeded, the focal length of the first lens element becomes relatively large compared to the focal length of the second lens element, making it difficult to correct distortion particularly at the wide-angle end. As a result, the amount of movement of the first lens unit in zooming also increases, making it difficult to achieve a compact zoom lens system. On the other hand, when the value goes below the lower limit of the condition (II-8), the focal length of the second lens element becomes relatively large compared to the focal length of the first lens element. It will be difficult.
- Each lens unit constituting the zoom lens system according to Embodiments 1 to 8 is 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 indices).
- the lens element of (1) is not limited to this.
- a diffractive lens element that deflects an incident light beam by diffraction a refractive-diffractive hybrid lens element that deflects an incident light beam by a combination of a diffractive action and a refractive action, a refractive index that deflects an incident ray by a refractive index distribution in a medium
- Each lens unit may be configured by a distributed lens element or the like.
- the refractive-diffractive hybrid type lens element it is preferable to form a diffractive structure at the interface of media having different refractive indexes, because the wavelength dependency of the diffraction efficiency is improved.
- an optical low pass filter or a face plate of an imaging device on the object side of the image surface S (between the image surface S and the most image side lens surface of the fourth lens group G4), it is equivalent to an optical low pass filter or a face plate of an imaging device.
- the low pass filter a birefringent low pass filter made of quartz or the like whose crystal axis direction has been adjusted in a predetermined direction, an optical cutoff frequency required
- a phase type low pass filter or the like which achieves the characteristics by the diffraction effect is applicable.
- FIG. 25 is a schematic block diagram of a digital still camera according to the ninth embodiment.
- the digital still camera includes an imaging device including a zoom lens system 1 and an imaging element 2 which is a CCD, a liquid crystal monitor 3 and a housing 4.
- the zoom lens system according to Embodiment 1 is used as the zoom lens system 1.
- the zoom lens system 1 is composed of a first lens group G1, an aperture stop A, a second lens group G2, a third lens group G3, and a fourth lens group G4.
- the zoom lens system 1 is disposed on the front side
- the imaging device 2 is disposed on the rear side of the zoom lens system 1.
- the liquid crystal monitor 3 is disposed on the rear side of the housing 4, and an optical image of an object 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 A and the second lens group G2, the third lens group G3 and the fourth lens group G4 move to a predetermined position based on the imaging device 2, Zooming can be performed from the wide-angle end to the telephoto end.
- the fourth lens group G4 is movable in the optical axis direction by the focus adjustment motor.
- any of the zoom lens systems according to Embodiments 2 to 8 may be used instead of the zoom lens system according to Embodiment 1.
- the optical system of the digital still camera shown in FIG. 25 can also be used in a digital video camera for moving images. In this case, not only still images but also moving images with high resolution can be captured.
- the zoom lens system according to the first to eighth embodiments is shown as the zoom lens system 1.
- these zoom lens systems need to use all the zooming regions. There is no. That is, the range in which the optical performance is secured may be cut out according to the desired zooming range, and used as a zoom lens system having a lower magnification than the zoom lens system described in the first to eighth embodiments.
- the zoom lens system is applied to a so-called lens barrel having a collapsed configuration
- a prism having an internal reflection surface or a surface reflection mirror may be disposed at an arbitrary position within the first lens group G1 or the like, and the zoom lens system may be applied to a so-called lens barrel having a bending configuration.
- a part of lenses constituting a zoom lens system such as the whole second lens group G2, the whole third lens group G3, the second lens group G2 or a part of the third lens group G3.
- the zoom lens system may be applied to a so-called sliding lens barrel which retracts the group from the optical axis at the time of retraction.
- a mobile phone device a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, and an imaging device including the zoom lens system according to the first to eighth embodiments described above and an imaging device such as a CCD or CMOS. , Web camera, in-vehicle camera, etc.
- FIGS. 26, 29, 32, 35 and 38 each show a zoom lens system in focus at infinity.
- the lens configuration of T 1 )) and the lens configuration of the telephoto end (longest focal length state: focal length f T ) are shown in FIG.
- straight or curved arrows provided between (a) and (b) show the movement of each lens group from the wide-angle end to the telephoto end via the intermediate position.
- the arrow attached to the lens unit represents focusing from an infinity in-focus condition to a close-object in-focus condition. That is, the moving direction in focusing from an infinity in-focus condition to a close-object in-focus condition is shown.
- the zoom lens system according to each embodiment includes, in order from the object side to the image side, a first lens group G1 having negative power, a second lens group G2 having positive power, and a second lens group G2 having positive power. 3 lens group G3 and a fourth lens group having a positive power, and during zooming, an interval between each lens group, that is, an interval between the first lens group and a second lens group, a second lens group and a second lens group Each lens group moves along the optical axis such that the distance between the third lens group and the distance between the third lens group and the fourth lens group change.
- the zoom lens system according to each embodiment enables downsizing of the entire lens system while maintaining high optical performance by arranging the respective lens units in a desired power arrangement.
- an asterisk * attached to a specific surface indicates that the surface is aspheric.
- the symbol (+) and the symbol (-) attached to the symbols of the respective lens units correspond to the symbols of the powers of the respective lens units.
- the straight line described on the right side represents the position of the image surface S, and on the object side of the image surface S (between the image surface S and the most image side lens surface of the fourth lens group G4) Is provided with a parallel plate P equivalent to an optical low pass filter, a face plate of an imaging device, and the like.
- An aperture stop A is provided, and moves along the optical axis integrally with the third lens group G3 during zooming from the wide-angle end to the telephoto end during imaging.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface
- the second lens element L2 has an aspheric object side.
- the second lens unit G2 is composed, in order from the object side to the image side, of a biconvex third lens element L3 and a biconcave fourth lens element L4. .
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex fifth lens element L5 and a biconvex sixth lens element L6. And a biconcave seventh lens element L7. Among these, the sixth lens element L6 and the seventh lens element L7 are cemented.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a biconvex eighth lens element L8.
- the eighth lens element L8 has an aspheric image side surface.
- the first lens group G1 draws a locus convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, at the time of zooming from the wide angle end to the telephoto end at the time of imaging, each lens group moves along the optical axis such that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface
- the second lens element L2 has an aspheric object side.
- the second lens unit G2 is composed, in order from the object side to the image side, of a biconvex third lens element L3 and a biconcave fourth lens element L4. .
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 has a biconvex fifth lens element L5 and a biconvex sixth lens element L6 in this order from the object side to the image side. And a biconcave seventh lens element L7.
- the sixth lens element L6 and the seventh lens element L7 are cemented.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a biconvex eighth lens element L8.
- the eighth lens element L8 has an aspheric image side surface.
- the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, at the time of zooming from the wide angle end to the telephoto end at the time of imaging, each lens group moves along the optical axis such that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface.
- the second lens unit G2 in order from the object side to the image side, has a positive meniscus third lens element L3 with the convex surface facing the object side, and a convex surface on the object side It consists of the 4th lens element L4 of the negative meniscus shape which turned.
- the third lens element L3 and the fourth lens element L4 are cemented.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 has a biconvex fifth lens element L5 and a biconvex sixth lens element L6 in this order from the object side to the image side. And a biconcave seventh lens element L7.
- the sixth lens element L6 and the seventh lens element L7 are cemented.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a positive meniscus eighth lens element L8 with the convex surface facing the object side.
- the eighth lens element L8 has an aspheric image side surface.
- the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, at the time of zooming from the wide angle end to the telephoto end at the time of imaging, each lens group moves along the optical axis such that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side in order from the object side to the image side And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface.
- the second lens unit G2 is composed of a biconvex third lens element L3 and a biconcave fourth lens element L4 in order from the object side to the image side.
- the third lens element L3 and the fourth lens element L4 are cemented, and in the surface data in the corresponding numerical example to be described later, in the adhesive layer between the third lens element L3 and the fourth lens element L4. Face number 6 is assigned.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 has a biconvex fifth lens element L5 and a biconvex sixth lens element L6 in this order from the object side to the image side. And a biconcave seventh lens element L7.
- the sixth lens element L6 and the seventh lens element L7 are cemented, and in the surface data in the corresponding numerical example to be described later, the adhesion between the sixth lens element L6 and the seventh lens element L7 Surface number 13 is given to the agent layer.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a biconvex eighth lens element L8.
- the eighth lens element L8 has an aspheric image side surface.
- the first lens group G1 draws a locus convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, at the time of zooming from the wide angle end to the telephoto end at the time of imaging, each lens group moves along the optical axis such that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 has a negative meniscus first lens element L1 with the convex surface facing the object side, in order from the object side to the image side. And a positive meniscus second lens element L2 with the convex surface facing the object side.
- the first lens element L1 has an aspheric image side surface.
- the second lens unit G2 in order from the object side to the image side, has a positive meniscus third lens element L3 with the convex surface facing the object side, and a convex surface on the object side It consists of the 4th lens element L4 of the negative meniscus shape which turned.
- the third lens element L3 and the fourth lens element L4 are cemented, and in the surface data in the corresponding numerical example to be described later, in the adhesive layer between the third lens element L3 and the fourth lens element L4. Face number 6 is assigned.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 includes, in order from the object side to the image side, a biconvex fifth lens element L5 and a biconvex sixth lens element L6. And a biconcave seventh lens element L7.
- the sixth lens element L6 and the seventh lens element L7 are cemented, and in the surface data in the corresponding numerical example to be described later, the adhesion between the sixth lens element L6 and the seventh lens element L7 Surface number 13 is given to the agent layer.
- the fifth lens element L5 has an aspheric object side surface.
- the fourth lens unit G4 comprises solely a biconvex eighth lens element L8.
- the eighth lens element L8 has an aspheric image side surface.
- the zoom lens system according to Embodiment 14 when zooming from the wide-angle end to the telephoto end at the time of imaging, the first lens group G1 draws a locus of a convex on the image side and the position at the telephoto end is the wide-angle end
- the second lens group G2 moves to the object side
- the third lens group G3 moves to the object side with the aperture stop A
- the fourth lens group G4 moves to the object side. Move to the object side. That is, at the time of zooming from the wide angle end to the telephoto end at the time of imaging, each lens group moves along the optical axis such that the distance between the first lens group G1 and the second lens group G2 decreases.
- the first lens unit G1 includes, in order from the object side to the image side, a first lens element L1 having negative power, and a second lens element having positive power. Since the lens element L2 and the lens element L2 are used, it is possible to realize a short optical total length (lens total length) while satisfactorily correcting various aberrations, in particular distortion at the wide-angle end.
- the first lens unit G1 includes at least one lens element having an aspheric surface, aberration, particularly distortion at the wide-angle end, can be corrected even better. Can.
- the fourth lens unit G4 is composed of a single lens element, the total number of lens elements is reduced, and a lens system having a short optical total length (lens total length) It has become.
- one lens element constituting the fourth lens unit G4 includes an aspheric surface, it is possible to correct the aberration more satisfactorily.
- the third lens unit G3 located immediately on the image side of the aperture stop A is constituted by three lens elements including one cemented lens element in it. Therefore, the thickness of the third lens group G3 is small, and the total optical length (lens total length) is short.
- the first lens group G1, the second lens group G2, the third lens group G3, and the fourth lens are provided during zooming from the wide-angle end to the telephoto end during imaging.
- the zooming operation is performed by moving the group G4 along the optical axis, and one of the first lens group G1, the second lens group G2, the third lens group G3 and the fourth lens group G4, Alternatively, the image point movement due to the vibration of the entire system is corrected by moving a part of the sub lens units of each lens group in the direction orthogonal to the optical axis, that is, the image blurring due to camera shake, vibration etc. Can be corrected.
- the third lens group G3 moves in the direction orthogonal to the optical axis, thereby suppressing the enlargement of the entire zoom lens system and making it compact.
- Image blur correction can be performed while maintaining excellent imaging characteristics with small decentering coma and decentering astigmatism.
- one lens unit is composed of a plurality of lens elements
- one of the lens elements of the plurality of lens elements or ones adjacent to each other is referred to as a part of the sub lens unit of each lens unit. It refers to multiple lens elements.
- the zoom lens system is composed of two lens elements of a first lens element having a power of and a second lens element having a positive power (hereinafter, this lens configuration is referred to as a basic configuration III of the embodiment), The following condition (III-1) is satisfied.
- ⁇ W 35 ⁇ ⁇ ⁇ (III-1) (However, f T / f W > 2.0) here, ⁇ W : Half angle of view (°) at wide angle end, f T : focal length of the entire system at the telephoto end, f W is the focal length of the entire system at the wide angle end.
- the lens system comprises, in order from the object side to the image side, two lens elements of a first lens element having negative power and a second lens element having positive power, and the aperture stop is a second lens unit
- the zoom lens system located between it and the third lens group (hereinafter, this lens configuration is referred to as the basic configuration IV of the embodiment) satisfy the following conditions (III, IV-6).
- f L1 focal length of the first lens element
- f G1 is the focal length of the first lens group.
- the condition (III, IV-6) defines the focal length of the first lens element of the first lens unit.
- the value exceeds the upper limit of the condition (III, IV-6) the focal length of the first lens element becomes too large, which makes it difficult to correct distortion particularly at the wide-angle end, and the amount of movement of the first lens unit during zooming Also, it becomes difficult to achieve a compact zoom lens system.
- the focal length of the first lens element becomes too small, which makes it difficult to correct distortion particularly at the wide-angle end.
- the zoom lens system having Basic Configuration III or Basic Configuration IV satisfy the following conditions (III, IV-7).
- f L2 focal length of the second lens element
- f G1 is the focal length of the first lens group.
- the conditions (III, IV-7) define the focal length of the second lens element of the first lens unit.
- the focal length of the second lens element becomes too large, which makes it difficult to correct distortion particularly at the wide-angle end, and the amount of movement of the first lens unit in zooming Also, it becomes difficult to achieve a compact zoom lens system.
- the focal length of the second lens element becomes too small, which makes it difficult to correct distortion particularly at the wide-angle end.
- a zoom lens system having Basic Configuration III or Basic Configuration IV satisfy the following conditions (III, IV-8). 0.15 ⁇
- the condition (III, IV-8) defines the ratio of the focal length of the first lens element of the first lens unit to the second lens element. If the upper limit of the condition (III, IV-8) is exceeded, the focal length of the first lens element becomes relatively large compared to the focal length of the second lens element, and distortion correction particularly at the wide-angle end Not only becomes difficult, but also the amount of movement of the first lens unit in zooming becomes large, and it becomes difficult to achieve a compact zoom lens system. On the other hand, when the value goes below the lower limit of the conditions (III, IV-8), the focal length of the second lens element becomes relatively large compared to the focal length of the first lens element. Correction becomes difficult.
- the zoom lens system having the basic configuration IV satisfy the following condition (IV-3). 0.07 ⁇
- the condition (IV-3) defines the amount of movement of the fourth lens unit.
- the value exceeds the upper limit of the condition (IV-3) the amount of movement of the fourth lens unit becomes too large, which makes it difficult to achieve a compact zoom lens system.
- the value goes below the lower limit of the condition (IV-3) the amount of movement of the fourth lens unit becomes excessively small, which is not preferable because it becomes difficult to correct the aberration which fluctuates during zooming.
- the zoom lens system having the basic configuration IV satisfy the following condition (IV-4).
- IV-4 1.5 ⁇ f G4 / f W ⁇ 10.0 (IV-4) (However, f T / f W > 2.0) here, f G4 : Focal length of the fourth lens unit, f T : focal length of the entire system at the telephoto end, f W is the focal length of the entire system at the wide angle end.
- the condition (IV-4) sets forth the focal length of the fourth lens unit.
- the focal length of the fourth lens unit becomes too large, and it becomes difficult to secure the ambient light illuminance on the image plane.
- the focal length of the fourth lens unit becomes too small, which makes it difficult to correct aberration generated by the fourth lens unit, in particular spherical aberration.
- the zoom lens system having the basic configuration IV satisfy the following condition (IV-5).
- the condition (IV-5) sets forth the lateral magnification of the fourth lens group at the wide-angle end, and relates to the back focus. If the condition (IV-5) is not satisfied, the lateral magnification of the fourth lens unit disposed closest to the image side becomes large, so the back focus becomes too long and it is difficult to achieve a compact zoom lens system become.
- Each lens unit constituting the zoom lens system according to Embodiments 10 to 14 is 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 indices).
- the lens element of (1) is not limited to this.
- a diffractive lens element that deflects an incident light beam by diffraction a refractive-diffractive hybrid lens element that deflects an incident light beam by a combination of a diffractive action and a refractive action, a refractive index that deflects an incident ray by a refractive index distribution in a medium
- Each lens unit may be configured by a distributed lens element or the like.
- the refractive-diffractive hybrid type lens element it is preferable to form a diffractive structure at the interface of media having different refractive indexes, because the wavelength dependency of the diffraction efficiency is improved.
- an optical low pass filter or a face plate of an imaging device on the object side of the image surface S (between the image surface S and the most image side lens surface of the fourth lens group G4), it is equivalent to an optical low pass filter or a face plate of an imaging device.
- the low pass filter a birefringent low pass filter made of quartz or the like whose crystal axis direction has been adjusted in a predetermined direction, an optical cutoff frequency required
- a phase type low pass filter or the like which achieves the characteristics by the diffraction effect is applicable.
- FIG. 41 is a schematic block diagram of a digital still camera according to the fifteenth embodiment.
- the digital still camera includes an imaging device including a zoom lens system 1 and an imaging element 2 which is a CCD, a liquid crystal monitor 3 and a housing 4.
- the zoom lens system according to Embodiment 10 is used as the zoom lens system 1.
- the zoom lens system 1 includes a first lens group G1, a second lens group G2, an aperture stop A, a third lens group G3, and a fourth lens group G4.
- the zoom lens system 1 is disposed on the front side
- the imaging device 2 is disposed on the rear side of the zoom lens system 1.
- the liquid crystal monitor 3 is disposed on the rear side of the housing 4, and an optical image of an object 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 second lens group G2, the aperture stop A, the third lens group G3, and the fourth lens group G4 move to a predetermined position based on the imaging device 2, Zooming can be performed from the wide-angle end to the telephoto end.
- the fourth lens group G4 is movable in the optical axis direction by the focus adjustment motor.
- any of the zoom lens systems according to Embodiments 11 to 14 may be used instead of the zoom lens system according to Embodiment 10.
- the optical system of the digital still camera shown in FIG. 41 can also be used for a digital video camera for moving images. In this case, not only still images but also moving images with high resolution can be captured.
- the zoom lens systems according to Embodiments 10 to 14 are shown as the zoom lens system 1, but these zoom lens systems need to use all the zooming regions. There is no. That is, the range in which the optical performance is secured may be cut out according to the desired zooming range, and used as a zoom lens system having a lower magnification than the zoom lens system described in the tenth to fourteenth embodiments.
- the zoom lens system is applied to a so-called lens barrel having a collapsed configuration, but the present invention is not limited to this.
- a prism having an internal reflection surface or a surface reflection mirror may be disposed at an arbitrary position within the first lens group G1 or the like, and the zoom lens system may be applied to a so-called lens barrel having a bending configuration.
- a part of lenses constituting a zoom lens system such as the entire second lens group G2, the entire third lens group G3, the second lens group G2 or a part of the third lens group G3.
- the zoom lens system may be applied to a so-called sliding lens barrel which retracts the group from the optical axis at the time of retraction.
- a mobile phone device a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, and an imaging device including the zoom lens system according to the above-described Embodiments 10 to 14 and an imaging device such as a CCD or CMOS. , Web camera, in-vehicle camera, etc.
- the unit of length in the table is all "mm" and the unit of angle of view is all "°".
- r is the radius of curvature
- d is the surface separation
- nd is the refractive index for the d-line
- vd is the Abbe number for the d-line.
- the surface marked with * is an aspheric surface
- the aspheric shape is defined by the following equation.
- ⁇ is a conical constant
- A4, A6, A8, A10 and A12 are fourth-order, sixth-order, eighth-order, tenth-order and twelfth-order aspheric coefficients, respectively.
- 27, 30, 33, 36 and 39 are longitudinal aberration diagrams of the zoom lens systems according to Embodiments 10 to 14, respectively.
- each longitudinal aberration diagram shows the wide-angle end, (b) shows the intermediate position, and (c) shows the aberration at the telephoto end.
- Each longitudinal aberration figure shows spherical aberration (SA (mm)), astigmatism (AST (mm)), and distortion (DIS (%)) sequentially from the left side.
- the vertical axis represents the f-number (indicated by F in the figure)
- the solid line represents d-line
- the short broken line represents f-line
- the long broken line represents c-line (C- line) characteristics.
- the vertical axis represents the image height (indicated by H in the figure)
- the solid line represents the sagittal plane (indicated by s in the figure)
- the broken line represents the characteristics of the meridional plane (indicated by m in the figure). is there.
- the vertical axis represents the image height (indicated by H in the figure).
- FIGS. 3, 6, 9, 12, 15, 18, 21 and 24 are lateral aberration diagrams of the zoom lens systems at a telephoto limit according to Embodiments 1 to 8, respectively.
- each lateral aberration diagram the upper three aberration diagrams show the basic state without image blur correction at the telephoto end, and the lower three aberration diagrams show the entire third lens group G3 moving a predetermined amount in the direction perpendicular to the optical axis Each corresponds to the image blur correction state at the telephoto end.
- the upper row shows the lateral aberration at the image point of 70% of the maximum image height
- the middle row shows the lateral aberration at the axial image point
- the lower row shows the horizontal aberration at the image point of -70% Correspond to each.
- the upper stage shows the lateral aberration at the image point of 70% of the maximum image height
- the middle stage shows the lateral aberration at the axial image point
- the lower stage shows the image point at -70%
- the horizontal axis represents the distance from the chief ray on the pupil plane
- the solid line represents d-line
- the short broken line represents F-line
- the long broken line represents C-line C-line) characteristics.
- the meridional plane is a plane including the optical axis of the first lens group G1 and the optical axis of the third lens group G3.
- the movement amount of the third lens group G3 in the direction perpendicular to the optical axis in the image blur correction state at the telephoto end is as follows. Travel distance (mm) Example 1 0.108 Example 2 0.107 Example 3 0.127 Example 4 0.130 Example 5 0.130 Example 6 0.130 Example 7 0.123 Example 8 0.124 Example 10 0.107 Example 11 0.127 Example 12 0.130 Example 13 0.123 Example 14 0.117
- the image decentering amount when the zoom lens system is inclined by 0.6 ° at the telephoto end when the shooting distance is ⁇ is that the entire third lens group G3 moves in parallel in the direction perpendicular to the optical axis by the above values. Equal to the image eccentricity of
- the symmetry of the lateral aberration at the on-axis image point is good.
- the degree of curvature is small and the inclination of the aberration curve is almost equal. It can be seen that the aberration is small. This means that sufficient imaging performance is obtained even in the image blur correction state.
- the image blur correction angle of the zoom lens system is the same, as the focal length of the entire zoom lens system becomes shorter, the amount of parallel movement necessary for the image blur correction decreases. Therefore, at any zoom position, it is possible to perform sufficient image blur correction for the image blur correction angle up to 0.6 ° without degrading the imaging characteristics.
- A10 0.00000E + 00
- A12 0.00000E + 00
- Table 25 shows the corresponding values of the conditions in the zoom lens systems of Numerical Embodiments 1 to 8.
- Numerical Embodiment 10 The zoom lens system of Numerical Value Example 10 corresponds to Embodiment 10 shown in FIG. Table 26 shows the surface data of the zoom lens system of Numerical Example 10, Table 27 shows the aspheric surface data, and Table 28 shows various data.
- A10 0.00000E + 00
- A12 0.00000E + 00
- Numerical Embodiment 12 The zoom lens system of Numerical Example 12 corresponds to Embodiment 12 shown in FIG. Table 32 shows the surface data of the zoom lens system of Numerical Example 12, Table 33 shows the aspheric surface data, and Table 34 shows various data.
- Numerical Example 14 The zoom lens system of Numerical Example 14 corresponds to Embodiment 14 shown in FIG. Table 38 shows the surface data of the zoom lens system of Numerical Example 14, Table 39 shows the aspheric surface data, and Table 40 shows various data.
- Table 41 below shows the corresponding values of the conditions in the zoom lens systems of Numerical Embodiments 10 to 14.
- the zoom lens system according to the present invention is applicable to digital input devices such as digital cameras, cellular phones, PDAs (Personal Digital Assistants), surveillance cameras in surveillance systems, web cameras, in-vehicle cameras, etc. It is suitable for a photographing optical system that requires high image quality.
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Abstract
Description
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
以下の条件(I-1):
2ωW/FW≧34 ・・・(I-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
FW:広角端でのFナンバー、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足する、ズームレンズ系
に関する。
物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
以下の条件(I-1):
2ωW/FW≧34 ・・・(I-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
FW:広角端でのFナンバー、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足するズームレンズ系である、撮像装置
に関する。
物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
以下の条件(I-1):
2ωW/FW≧34 ・・・(I-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
FW:広角端でのFナンバー、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足するズームレンズ系である、カメラ
に関する。
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(II-1)及び(II-2):
nd1P>1.85 ・・・(II-1)
νd1P<35 ・・・(II-2)
(ただし、ωW>35)
(ここで、
nd1P:第1レンズ素子のd線に対する屈折率、
νd1P:第1レンズ素子のd線に対するアッベ数、
ωW:広角端での半画角(°)
である)を満足する、ズームレンズ系
に関する。
物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(II-1)及び(II-2):
nd1P>1.85 ・・・(II-1)
νd1P<35 ・・・(II-2)
(ただし、ωW>35)
(ここで、
nd1P:第1レンズ素子のd線に対する屈折率、
νd1P:第1レンズ素子のd線に対するアッベ数、
ωW:広角端での半画角(°)
である)を満足するズームレンズ系である、撮像装置
に関する。
物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(II-1)及び(II-2):
nd1P>1.85 ・・・(II-1)
νd1P<35 ・・・(II-2)
(ただし、ωW>35)
(ここで、
nd1P:第1レンズ素子のd線に対する屈折率、
νd1P:第1レンズ素子のd線に対するアッベ数、
ωW:広角端での半画角(°)
である)を満足するズームレンズ系である、カメラ
に関する。
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(III-1):
ωW>35 ・・・(III-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足する、ズームレンズ系
に関する。
物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(III-1):
ωW>35 ・・・(III-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足するズームレンズ系である、撮像装置
に関する。
物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(III-1):
ωW>35 ・・・(III-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足するズームレンズ系である、カメラ
に関する。
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
開口絞りが、前記第2レンズ群と前記第3レンズ群との間にある、ズームレンズ系
に関する。
物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
開口絞りが、前記第2レンズ群と前記第3レンズ群との間にあるズームレンズ系である、撮像装置
に関する。
物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
開口絞りが、前記第2レンズ群と前記第3レンズ群との間にあるズームレンズ系である、カメラ
に関する。
図1、4、7、10、13、16、19及び22は、各々実施の形態1~8に係るズームレンズ系のレンズ配置図である。
2ωW/FW≧34 ・・・(I-1)
(ただし、fT/fW>2.0)
ここで、
ωW:広角端での半画角(°)、
FW:広角端でのFナンバー、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
2ωW/FW≧38 ・・・(I-1)’
(ただし、fT/fW>2.0)
1.0<|fG1/fW|<4.0 ・・・(I-2)
(ただし、fT/fW>2.0)
ここで、
fG1:第1レンズ群の焦点距離、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
nd1P>1.85 ・・・(II-1)
νd1P<35 ・・・(II-2)
(ただし、ωW>35)
ここで、
nd1P:第1レンズ素子のd線に対する屈折率、
νd1P:第1レンズ素子のd線に対するアッベ数、
ωW:広角端での半画角(°)
である。
nd1P>1.90 ・・・(II-1)’
νd1P<22 ・・・(II-2)’
(ただし、ωW>35)
0.07<|DG4/fG4|<0.25 ・・・(I,II-3)
(ただし、fT/fW>2.0)
ここで、
DG4:第4レンズ群のズーミング時の光軸に沿った方向への移動量、
fG4:第4レンズ群の焦点距離、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
1.5<fG4/fW<10.0 ・・・(I,II-4)
(ただし、fT/fW>2.0)
ここで、
fG4:第4レンズ群の焦点距離、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
fG4/fW<7.5 ・・・(I,II-4)’
(ただし、fT/fW>2.0)
|β4W|<1.5 ・・・(I,II-5)
(ただし、fT/fW>2.0)
ここで、
β4W:第4レンズ群の広角端での横倍率、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
|β4W|<1.0 ・・・(I,II-5)’
|β4W|<0.8 ・・・(I,II-5)’’
(ただし、fT/fW>2.0)
0.5<fL1/fG1<0.8 ・・・(II-6)
ここで、
fL1:第1レンズ素子の焦点距離、
fG1:第1レンズ群の焦点距離
である。
fL1/fG1<0.67 ・・・(II-6)’
1.5<|fL2/fG1|<4.0 ・・・(II-7)
ここで、
fL2:第2レンズ素子の焦点距離、
fG1:第1レンズ群の焦点距離
である。
2.4<|fL2/fG1| ・・・(II-7)’
0.15<|fL1/fL2|<4.00 ・・・(II-8)
ここで、
fL1:第1レンズ素子の焦点距離、
fL2:第2レンズ素子の焦点距離
である。
|fL1/fL2|<0.25 ・・・(II-8)’
図25は、実施の形態9に係るデジタルスチルカメラの概略構成図である。図25において、デジタルスチルカメラは、ズームレンズ系1とCCDである撮像素子2とを含む撮像装置と、液晶モニタ3と、筐体4とから構成される。ズームレンズ系1として、実施の形態1に係るズームレンズ系が用いられている。図25において、ズームレンズ系1は、第1レンズ群G1と、開口絞りAと、第2レンズ群G2と、第3レンズ群G3と、第4レンズ群G4とから構成されている。筐体4は、前側にズームレンズ系1が配置され、ズームレンズ系1の後側には、撮像素子2が配置されている。筐体4の後側に液晶モニタ3が配置され、ズームレンズ系1による被写体の光学的な像が像面Sに形成される。
図26、29、32、35及び38は、各々実施の形態10~14に係るズームレンズ系のレンズ配置図である。
ωW>35 ・・・(III-1)
(ただし、fT/fW>2.0)
ここで、
ωW:広角端での半画角(°)、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
0.5<fL1/fG1<0.8 ・・・(III,IV-6)
ここで、
fL1:第1レンズ素子の焦点距離、
fG1:第1レンズ群の焦点距離
である。
fL1/fG1<0.67 ・・・(III,IV-6)’
1.5<|fL2/fG1|<4.0 ・・・(III,IV-7)
ここで、
fL2:第2レンズ素子の焦点距離、
fG1:第1レンズ群の焦点距離
である。
2.4<|fL2/fG1| ・・・(III,IV-7)’
0.15<|fL1/fL2|<4.00 ・・・(III,IV-8)
ここで、
fL1:第1レンズ素子の焦点距離、
fL2:第2レンズ素子の焦点距離、
である。
|fL1/fL2|<0.25 ・・・(III,IV-8)’
0.07<|DG4/fG4|<0.25 ・・・(IV-3)
(ただし、fT/fW>2.0)
ここで、
DG4:第4レンズ群のズーミング時の光軸に沿った方向への移動量、
fG4:第4レンズ群の焦点距離、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
1.5<fG4/fW<10.0 ・・・(IV-4)
(ただし、fT/fW>2.0)
ここで、
fG4:第4レンズ群の焦点距離、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
fG4/fW<7.5 ・・・(IV-4)’’
(ただし、fT/fW>2.0)
|β4W|<1.5 ・・・(IV-5)
(ただし、fT/fW>2.0)
ここで、
β4W:第4レンズ群の広角端での横倍率、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。
|β4W|<1.0 ・・・(IV-5)’
|β4W|<0.8 ・・・(IV-5)’’
(ただし、fT/fW>2.0)
図41は、実施の形態15に係るデジタルスチルカメラの概略構成図である。図41において、デジタルスチルカメラは、ズームレンズ系1とCCDである撮像素子2とを含む撮像装置と、液晶モニタ3と、筐体4とから構成される。ズームレンズ系1として、実施の形態10に係るズームレンズ系が用いられている。図41において、ズームレンズ系1は、第1レンズ群G1と、第2レンズ群G2と、開口絞りAと、第3レンズ群G3と、第4レンズ群G4とから構成されている。筐体4は、前側にズームレンズ系1が配置され、ズームレンズ系1の後側には、撮像素子2が配置されている。筐体4の後側に液晶モニタ3が配置され、ズームレンズ系1による被写体の光学的な像が像面Sに形成される。
ここで、κは円錐定数、A4、A6、A8、A10及びA12は、それぞれ4次、6次、8次、10次及び12次の非球面係数である。
移動量(mm)
実施例1 0.108
実施例2 0.107
実施例3 0.127
実施例4 0.130
実施例5 0.130
実施例6 0.130
実施例7 0.123
実施例8 0.124
実施例10 0.107
実施例11 0.127
実施例12 0.130
実施例13 0.123
実施例14 0.117
数値実施例1のズームレンズ系は、図1に示した実施の形態1に対応する。数値実施例1のズームレンズ系の面データを表1に、非球面データを表2に、各種データを表3に示す。
面番号 r d nd vd
物面 ∞
1* 26.46600 2.01600 1.68966 53.0
2* 5.48900 5.03400
3* 16.02300 2.20000 1.99537 20.7
4 23.30000 可変
5(絞り) ∞ 0.30000
6* 10.05500 1.39800 1.80470 41.0
7 49.69300 0.93300
8 22.05300 1.35000 1.83500 43.0
9 -140.13900 0.40000 1.80518 25.5
10 8.94000 可変
11* 8.19300 2.50000 1.68863 52.8
12 -22.84400 0.30000
13 14.14700 0.70000 1.72825 28.3
14 6.21900 可変
15* 9.93700 1.92200 1.51443 63.3
16* 40.88200 可変
17 ∞ 0.90000 1.51680 64.2
18 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4=-1.15959E-04, A6= 1.46087E-07, A8= 2.55385E-10
A10= 0.00000E+00
第2面
K=-8.94415E-01, A4= 1.56211E-04, A6=-8.50454E-07, A8=-6.92380E-08
A10= 5.41652E-10
第3面
K=-1.15758E+00, A4= 9.48348E-05, A6=-1.26303E-07, A8=-2.58189E-09
A10= 0.00000E+00
第6面
K=-5.75419E-01, A4=-1.53947E-06, A6=-4.49953E-07, A8=-3.34490E-08
A10= 9.55120E-10
第11面
K= 0.00000E+00, A4=-3.56486E-04, A6=-5.33043E-07, A8=-3.91783E-08
A10= 0.00000E+00
第15面
K= 1.37651E+00, A4=-2.07124E-04, A6=-1.43147E-05, A8= 2.83699E-07
A10=-7.50170E-09
第16面
K= 0.00000E+00, A4= 9.63145E-05, A6=-1.13976E-05, A8= 9.43475E-08
A10= 0.00000E+00
ズーム比 2.21958
広角 中間 望遠
焦点距離 4.6402 6.9137 10.2992
Fナンバー 2.07000 2.29000 2.65000
画角 49.7098 35.0496 24.7918
像高 4.6250 4.6250 4.6250
レンズ全長 54.2809 44.9071 40.2351
BF 0.88151 0.88677 0.88337
d4 23.6313 11.9638 4.2975
d10 2.1787 2.1453 1.5345
d14 5.0864 6.4956 8.6386
d16 2.5500 3.4626 4.9381
ズームレンズ群データ
群 始面 焦点距離
1 1 -14.74961
2 5 36.14986
3 11 16.01110
4 15 24.99213
数値実施例2のズームレンズ系は、図4に示した実施の形態2に対応する。数値実施例2のズームレンズ系の面データを表4に、非球面データを表5に、各種データを表6に示す。
面番号 r d nd vd
物面 ∞
1 248.89100 1.85000 1.68966 53.0
2* 7.26600 5.72400
3* 16.57200 1.55000 1.99537 20.7
4 22.76600 可変
5* 10.28400 1.42400 1.80470 41.0
6 -43.92800 0.69900
7 -59.56600 0.80000 1.80610 33.3
8 11.22300 可変
9(絞り) ∞ 0.30000
10* 10.08700 2.65000 1.68863 52.8
11 -29.30300 0.30000
12 15.18000 1.54000 1.88300 40.8
13 -10.53100 0.40000 1.72825 28.3
14 6.04600 可変
15 11.50000 2.30000 1.51443 63.3
16* -116.95500 可変
17 ∞ 0.90000 1.51680 64.2
18 ∞ (BF)
像面 ∞
第2面
K=-1.90619E+00, A4= 3.22023E-04, A6=-1.23588E-06, A8= 8.64360E-09
A10=-3.70529E-12, A12= 0.00000E+00
第3面
K= 0.00000E+00, A4=-1.46549E-05, A6= 1.71224E-07, A8= 0.00000E+00
A10= 0.00000E+00, A12= 0.00000E+00
第5面
K=-5.76319E-01, A4=-5.22325E-06, A6=-4.56173E-06, A8= 4.04842E-07
A10=-1.50861E-08, A12= 0.00000E+00
第10面
K= 0.00000E+00, A4=-3.51812E-04, A6= 1.11646E-05, A8=-1.26405E-06
A10= 4.22889E-08, A12= 0.00000E+00
第16面
K= 0.00000E+00, A4= 9.23930E-05, A6= 2.18939E-05, A8=-2.29808E-06
A10= 9.53998E-08, A12=-1.47284E-09
ズーム比 2.21854
広角 中間 望遠
焦点距離 4.6594 6.9418 10.3371
Fナンバー 2.48000 2.84000 3.39000
画角 48.6081 34.7387 24.3068
像高 4.5700 4.5700 4.5700
レンズ全長 53.4593 43.3220 38.8923
BF 0.88011 0.88360 0.85886
d4 20.5602 8.4927 1.5000
d8 4.6413 4.2277 2.9000
d14 4.3469 5.5163 8.1536
d16 2.5938 3.7647 5.0428
ズームレンズ群データ
群 始面 焦点距離
1 1 -14.92842
2 5 42.19028
3 9 15.54876
4 15 20.47806
数値実施例3のズームレンズ系は、図7に示した実施の形態3に対応する。数値実施例3のズームレンズ系の面データを表7に、非球面データを表8に、各種データを表9に示す。
面番号 r d nd vd
物面 ∞
1 137.47500 1.85000 1.68966 53.0
2* 7.49600 4.87500
3* 13.06200 1.55000 1.99537 20.7
4 16.13900 可変
5* 10.44100 1.81100 1.80470 41.0
6 -28.71300 0.30000
7 -30.99400 0.70000 1.80610 33.3
8 12.27400 可変
9(絞り) ∞ 0.30000
10* 10.04700 2.60000 1.68863 52.8
11 -55.91400 0.30000
12 14.28600 1.53000 1.88300 40.8
13 -14.49300 0.40000 1.72825 28.3
14 6.37000 可変
15 14.84000 1.52700 1.51443 63.3
16* -66.89200 可変
17 ∞ 0.90000 1.51680 64.2
18 ∞ (BF)
像面 ∞
第2面
K=-2.38335E+00, A4= 5.13474E-04, A6=-3.40371E-06, A8= 2.93983E-08
A10=-7.99911E-11, A12= 0.00000E+00
第3面
K= 0.00000E+00, A4=-3.10440E-07, A6= 5.90876E-09, A8= 0.00000E+00
A10= 0.00000E+00, A12= 0.00000E+00
第5面
K=-5.11546E-01, A4=-3.37256E-06, A6=-2.47048E-06, A8= 1.54019E-07
A10=-4.29662E-09, A12= 0.00000E+00
第10面
K= 1.83293E-01, A4=-2.87629E-04, A6= 5.82833E-06, A8=-6.20443E-07
A10= 1.88935E-08, A12= 0.00000E+00
第16面
K= 0.00000E+00, A4= 5.68928E-05, A6= 1.42306E-05, A8=-1.72170E-06
A10= 8.29689E-08, A12=-1.47000E-09
ズーム比 2.33132
広角 中間 望遠
焦点距離 5.2420 8.0004 12.2208
Fナンバー 2.07092 2.40703 2.86353
画角 45.2836 31.1674 20.9682
像高 4.5700 4.5700 4.5700
レンズ全長 54.8826 44.6604 39.5720
BF 0.88341 0.88121 0.87308
d4 21.0288 8.8031 1.5000
d8 5.7474 4.9089 2.9000
d14 4.3088 5.5978 7.1913
d16 4.2712 5.8264 8.4646
ズームレンズ群データ
群 始面 焦点距離
1 1 -15.41285
2 5 43.10870
3 9 17.20921
4 15 23.76045
数値実施例4のズームレンズ系は、図10示した実施の形態4に対応する。数値実施例4のズームレンズ系の面データを表10、非球面データを表11に、各種データを表12に示す。
面番号 r d nd vd
物面 ∞
1 180.00000 1.85000 1.68966 53.0
2* 7.08400 4.51300
3 13.82400 2.20000 1.92286 20.9
4 19.67200 可変
5* 10.57800 1.97800 1.80470 41.0
6 100.00000 0.50000 1.75520 27.5
7 12.65900 可変
8(絞り) ∞ 0.30000
9* 10.49500 2.48400 1.68863 52.8
10 -61.25500 0.65400
11 11.53900 1.46100 1.83500 43.0
12 -24.34800 0.40000 1.72825 28.3
13 6.09300 可変
14 13.01800 2.25000 1.60602 57.4
15* 120.99600 可変
16 ∞ 0.90000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第2面
K=-1.81575E+00, A4= 4.07000E-04, A6=-1.69323E-06, A8= 1.55354E-08
A10=-6.73938E-11, A12= 0.00000E+00
第5面
K= 2.34407E+00, A4=-2.77129E-04, A6=-8.78661E-06, A8= 1.99478E-07
A10=-1.20026E-08, A12= 0.00000E+00
第9面
K= 5.52606E-02, A4=-2.18084E-04, A6= 5.79842E-06, A8=-5.60474E-07
A10= 1.65403E-08, A12= 0.00000E+00
第15面
K= 0.00000E+00, A4= 5.15970E-05, A6= 9.83168E-06, A8=-1.34794E-06
A10= 7.28423E-08, A12=-1.46950E-09
ズーム比 2.34657
広角 中間 望遠
焦点距離 5.2710 8.0458 12.3688
Fナンバー 2.07093 2.41762 2.90325
画角 41.6744 30.6121 21.1415
像高 4.1630 4.4870 4.6250
レンズ全長 53.8341 44.7346 40.6770
BF 0.88586 0.88254 0.87072
d4 20.6756 9.1296 1.5000
d7 4.5413 4.0383 3.0000
d13 4.3151 5.9535 7.9915
d15 3.9262 5.2407 7.8248
ズームレンズ群データ
群 始面 焦点距離
1 1 -15.39956
2 5 45.00188
3 8 17.93655
4 14 23.88315
数値実施例5のズームレンズ系は、図13に示した実施の形態5に対応する。数値実施例5のズームレンズ系の面データを表13に、非球面データを表14に、各種データを表15に示す。
面番号 r d nd vd
物面 ∞
1 180.00000 1.85000 1.68966 53.0
2* 7.05700 4.40400
3 13.75200 2.20000 1.92286 20.9
4 19.69600 可変
5* 10.85300 2.00300 1.80470 41.0
6 125.00000 0.50000 1.75520 27.5
7 13.13500 可変
8(絞り) ∞ 0.30000
9* 10.63000 2.52400 1.68863 52.8
10 -51.08600 0.62800
11 12.32000 1.44700 1.83481 42.7
12 -22.32700 0.40000 1.72825 28.3
13 6.30600 可変
14 12.84300 2.40000 1.60602 57.4
15* 142.13200 可変
16 ∞ 0.90000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第2面
K=-8.33929E-01, A4= 6.02474E-05, A6= 5.14320E-07, A8=-3.69741E-09
A10= 2.97017E-11, A12= 0.00000E+00
第5面
K= 2.55396E+00, A4=-2.77018E-04, A6=-8.65400E-06, A8= 1.94516E-07
A10=-1.20753E-08, A12= 0.00000E+00
第9面
K= 1.02267E-01, A4=-2.26353E-04, A6= 5.35520E-06, A8=-5.40727E-07
A10= 1.65403E-08, A12= 0.00000E+00
第15面
K= 0.00000E+00, A4= 5.39823E-05, A6= 8.65875E-06, A8=-1.14875E-06
A10= 6.05261E-08, A12=-1.19039E-09
ズーム比 2.34513
広角 中間 望遠
焦点距離 5.2746 8.0479 12.3696
Fナンバー 2.07200 2.42052 2.90092
画角 45.4615 31.4763 21.1596
像高 4.6250 4.6250 4.6250
レンズ全長 53.8431 45.0390 41.0317
BF 0.89382 0.88677 0.87271
d4 20.6391 9.1232 1.5000
d7 4.4541 4.1301 3.0000
d13 4.6411 6.4485 8.6880
d15 3.6590 4.8944 7.4150
ズームレンズ群データ
群 始面 焦点距離
1 1 -15.40155
2 5 44.99112
3 8 17.94798
4 14 23.13547
数値実施例6のズームレンズ系は、図16に示した実施の形態6に対応する。数値実施例6のズームレンズ系の面データを表16に、非球面データを表17に、各種データを表18に示す。
面番号 r d nd vd
物面 ∞
1 180.00000 2.28900 1.68966 53.0
2* 7.28800 4.71100
3 14.17100 2.20000 1.92286 20.9
4 19.49100 可変
5* 10.51800 1.92700 1.80359 40.8
6 -51.34000 0.00500 1.56732 42.8
7 -51.34000 0.50000 1.80610 33.3
8 13.35600 可変
9(絞り) ∞ 0.30000
10* 10.52500 2.65000 1.68863 52.8
11 -54.91900 0.41900
12 12.87200 1.53100 1.83481 42.7
13 -15.87000 0.00500 1.56732 42.8
14 -15.87000 0.40000 1.72825 28.3
15 6.37600 可変
16 12.87400 2.40000 1.60602 57.4
17* 97.67400 可変
18 ∞ 0.90000 1.51680 64.2
19 ∞ (BF)
像面 ∞
第2面
K=-2.35110E+00, A4= 5.39797E-04, A6=-4.24274E-06, A8= 4.31700E-08
A10=-2.06007E-10, A12= 0.00000E+00
第5面
K= 2.25128E+00, A4=-2.69414E-04, A6=-8.36928E-06, A8= 1.70475E-07
A10=-1.06907E-08, A12= 0.00000E+00
第10面
K=-6.79889E-02, A4=-2.35469E-04, A6= 7.04263E-06, A8=-6.68534E-07
A10= 2.00970E-08, A12= 0.00000E+00
第17面
K= 0.00000E+00, A4= 4.92082E-05, A6= 1.12407E-05, A8=-1.40025E-06
A10= 7.38260E-08, A12=-1.46950E-09
ズーム比 2.34600
広角 中間 望遠
焦点距離 5.2722 8.0461 12.3686
Fナンバー 2.07113 2.41942 2.90424
画角 45.5746 31.5348 21.1424
像高 4.6250 4.6250 4.6250
レンズ全長 54.6289 45.6581 41.5604
BF 0.88890 0.88292 0.86816
d4 20.6299 9.0961 1.5000
d8 4.5627 4.1342 3.0000
d15 4.3710 6.0841 8.1675
d17 3.9394 5.2238 7.7877
ズームレンズ群データ
群 始面 焦点距離
1 1 -15.39799
2 5 45.00265
3 9 18.05232
4 16 24.21008
数値実施例7のズームレンズ系は、図19に示した実施の形態7に対応する。数値実施例7のズームレンズ系の面データを表19に、非球面データを表20に、各種データを表21に示す。
面番号 r d nd vd
物面 ∞
1 74.15600 1.85000 1.74993 45.4
2* 7.58000 3.85300
3 12.45500 2.10000 1.92286 20.9
4 17.84100 可変
5* 13.34800 2.25500 1.80359 40.8
6 -18.64600 0.00500 1.56732 42.8
7 -18.64600 0.50000 1.80610 33.3
8 16.85000 可変
9(絞り) ∞ 0.30000
10* 10.88900 3.00000 1.68863 52.8
11 -48.29500 0.58200
12 11.19600 1.71300 1.83481 42.7
13 -12.55000 0.00500 1.56732 42.8
14 -12.55000 0.43900 1.71736 29.5
15 5.79600 可変
16 15.38300 1.36400 1.60602 57.4
17* -289.01800 可変
18 ∞ 0.90000 1.51680 64.2
19 ∞ (BF)
像面 ∞
第2面
K=-1.85142E+00, A4= 3.96910E-04, A6=-1.32061E-06, A8= 1.62746E-08
A10=-4.52082E-11, A12= 2.52047E-26
第5面
K= 3.92686E+00, A4=-2.20840E-04, A6=-6.53734E-06, A8= 1.49216E-07
A10=-7.69756E-09, A12=-7.32507E-28
第10面
K=-1.06936E-01, A4=-2.13740E-04, A6= 5.10378E-06, A8=-5.19377E-07
A10= 1.61556E-08, A12= 0.00000E+00
第17面
K= 0.00000E+00, A4= 3.22743E-05, A6= 5.56174E-06, A8=-9.74806E-07
A10= 6.08346E-08, A12=-1.46950E-09
ズーム比 2.34773
広角 中間 望遠
焦点距離 5.2691 8.0454 12.3704
Fナンバー 2.07001 2.35450 2.77182
画角 45.5749 31.4639 21.0274
像高 4.6250 4.6250 4.6250
レンズ全長 56.5780 44.7974 38.7099
BF 0.87800 0.87842 0.87352
d4 23.3636 9.7995 1.5000
d8 5.0995 4.5171 3.0000
d15 4.2965 5.2005 6.5542
d17 4.0744 5.5359 7.9162
ズームレンズ群データ
群 始面 焦点距離
1 1 -17.39958
2 5 60.06224
3 9 16.18585
4 16 24.14170
数値実施例8のズームレンズ系は、図22に示した実施の形態8に対応する。数値実施例8のズームレンズ系の面データを表22に、非球面データを表23に、各種データを表24に示す。
面番号 r d nd vd
物面 ∞
1 50.88200 1.85000 1.80470 41.0
2* 7.91600 4.84100
3 12.74900 2.00000 1.94595 18.0
4 16.63500 可変
5* 11.92600 1.63200 1.80359 40.8
6 81.44300 0.00500 1.56732 42.8
7 81.44300 0.50000 1.80610 33.3
8 14.07200 可変
9(絞り) ∞ 0.30000
10* 10.57400 3.00000 1.68863 52.8
11 -38.11600 0.30000
12 11.72700 1.62500 1.83481 42.7
13 -17.69200 0.00500 1.56732 42.8
14 -17.69200 0.89400 1.75520 27.5
15 5.84700 可変
16 20.08500 1.28700 1.60602 57.4
17* -46.85500 可変
18 ∞ 0.90000 1.51680 64.2
19 ∞ (BF)
像面 ∞
第2面
K=-1.96432E+00, A4= 3.86726E-04, A6=-1.20023E-06, A8= 1.44052E-08
A10=-2.31846E-11, A12= 2.49554E-19
第5面
K= 3.27670E+00, A4=-2.62488E-04, A6=-8.11789E-06, A8= 1.84716E-07
A10=-1.14850E-08, A12=-7.28049E-20
第10面
K=-1.52083E-01, A4=-1.97624E-04, A6= 3.78296E-06, A8=-3.31425E-07
A10= 9.40208E-09, A12= 0.00000E+00
第17面
K= 0.00000E+00, A4= 3.29937E-05, A6= 2.46700E-06, A8=-7.44412E-07
A10= 5.43571E-08, A12=-1.46950E-09
ズーム比 2.34927
広角 中間 望遠
焦点距離 5.2640 8.0389 12.3667
Fナンバー 2.07513 2.35485 2.77604
画角 45.6219 31.3656 20.9437
像高 4.6250 4.6250 4.6250
レンズ全長 56.7299 45.2183 39.4747
BF 0.88065 0.88038 0.87429
d4 23.4665 9.9195 1.5000
d8 4.4715 4.1353 3.0000
d15 4.2446 4.9320 6.0621
d17 4.5276 6.2121 8.8993
ズームレンズ群データ
群 始面 焦点距離
1 1 -16.95991
2 5 68.03082
3 9 16.53511
4 16 23.36777
数値実施例10のズームレンズ系は、図26に示した実施の形態10に対応する。数値実施例10のズームレンズ系の面データを表26に、非球面データを表27に、各種データを表28に示す。
面番号 r d nd vd
物面 ∞
1 248.89100 1.85000 1.68966 53.0
2* 7.26600 5.72400
3* 16.57200 1.55000 1.99537 20.7
4 22.76600 可変
5* 10.28400 1.42400 1.80470 41.0
6 -43.92800 0.69900
7 -59.56600 0.80000 1.80610 33.3
8 11.22300 可変
9(絞り) ∞ 0.30000
10* 10.08700 2.65000 1.68863 52.8
11 -29.30300 0.30000
12 15.18000 1.54000 1.88300 40.8
13 -10.53100 0.40000 1.72825 28.3
14 6.04600 可変
15 11.50000 2.30000 1.51443 63.3
16* -116.95500 可変
17 ∞ 0.90000 1.51680 64.2
18 ∞ (BF)
像面 ∞
第2面
K=-1.90619E+00, A4= 3.22023E-04, A6=-1.23588E-06, A8= 8.64360E-09
A10=-3.70529E-12, A12= 0.00000E+00
第3面
K= 0.00000E+00, A4=-1.46549E-05, A6= 1.71224E-07, A8= 0.00000E+00
A10= 0.00000E+00, A12= 0.00000E+00
第5面
K=-5.76319E-01, A4=-5.22325E-06, A6=-4.56173E-06, A8= 4.04842E-07
A10=-1.50861E-08, A12= 0.00000E+00
第10面
K= 0.00000E+00, A4=-3.51812E-04, A6= 1.11646E-05, A8=-1.26405E-06
A10= 4.22889E-08, A12= 0.00000E+00
第16面
K= 0.00000E+00, A4= 9.23930E-05, A6= 2.18939E-05, A8=-2.29808E-06
A10= 9.53998E-08, A12=-1.47284E-09
ズーム比 2.21854
広角 中間 望遠
焦点距離 4.6594 6.9418 10.3371
Fナンバー 2.48000 2.84000 3.39000
画角 48.6081 34.7387 24.3068
像高 4.5700 4.5700 4.5700
レンズ全長 53.4593 43.3220 38.8923
BF 0.88011 0.88360 0.85886
d4 20.5602 8.4927 1.5000
d8 4.6413 4.2277 2.9000
d14 4.3469 5.5163 8.1536
d16 2.5938 3.7647 5.0428
ズームレンズ群データ
群 始面 焦点距離
1 1 -14.92842
2 5 42.19028
3 9 15.54876
4 15 20.47806
数値実施例11のズームレンズ系は、図29に示した実施の形態11に対応する。数値実施例11のズームレンズ系の面データを表29に、非球面データを表30に、各種データを表31に示す。
面番号 r d nd vd
物面 ∞
1 137.47500 1.85000 1.68966 53.0
2* 7.49600 4.87500
3* 13.06200 1.55000 1.99537 20.7
4 16.13900 可変
5* 10.44100 1.81100 1.80470 41.0
6 -28.71300 0.30000
7 -30.99400 0.70000 1.80610 33.3
8 12.27400 可変
9(絞り) ∞ 0.30000
10* 10.04700 2.60000 1.68863 52.8
11 -55.91400 0.30000
12 14.28600 1.53000 1.88300 40.8
13 -14.49300 0.40000 1.72825 28.3
14 6.37000 可変
15 14.84000 1.52700 1.51443 63.3
16* -66.89200 可変
17 ∞ 0.90000 1.51680 64.2
18 ∞ (BF)
像面 ∞
第2面
K=-2.38335E+00, A4= 5.13474E-04, A6=-3.40371E-06, A8= 2.93983E-08
A10=-7.99911E-11, A12= 0.00000E+00
第3面
K= 0.00000E+00, A4=-3.10440E-07, A6= 5.90876E-09, A8= 0.00000E+00
A10= 0.00000E+00, A12= 0.00000E+00
第5面
K=-5.11546E-01, A4=-3.37256E-06, A6=-2.47048E-06, A8= 1.54019E-07
A10=-4.29662E-09, A12= 0.00000E+00
第10面
K= 1.83293E-01, A4=-2.87629E-04, A6= 5.82833E-06, A8=-6.20443E-07
A10= 1.88935E-08, A12= 0.00000E+00
第16面
K= 0.00000E+00, A4= 5.68928E-05, A6= 1.42306E-05, A8=-1.72170E-06
A10= 8.29689E-08, A12=-1.47000E-09
ズーム比 2.33132
広角 中間 望遠
焦点距離 5.2420 8.0004 12.2208
Fナンバー 2.07092 2.40703 2.86353
画角 45.2836 31.1674 20.9682
像高 4.5700 4.5700 4.5700
レンズ全長 54.8826 44.6604 39.5720
BF 0.88341 0.88121 0.87308
d4 21.0288 8.8031 1.5000
d8 5.7474 4.9089 2.9000
d14 4.3088 5.5978 7.1913
d16 4.2712 5.8264 8.4646
ズームレンズ群データ
群 始面 焦点距離
1 1 -15.41285
2 5 43.10870
3 9 17.20921
4 15 23.76045
数値実施例12のズームレンズ系は、図32に示した実施の形態12に対応する。数値実施例12のズームレンズ系の面データを表32に、非球面データを表33に、各種データを表34に示す。
面番号 r d nd vd
物面 ∞
1 180.00000 1.85000 1.68966 53.0
2* 7.05700 4.40400
3 13.75200 2.20000 1.92286 20.9
4 19.69600 可変
5* 10.85300 2.00300 1.80470 41.0
6 125.00000 0.50000 1.75520 27.5
7 13.13500 可変
8(絞り) ∞ 0.30000
9* 10.63000 2.52400 1.68863 52.8
10 -51.08600 0.62800
11 12.32000 1.44700 1.83481 42.7
12 -22.32700 0.40000 1.72825 28.3
13 6.30600 可変
14 12.84300 2.40000 1.60602 57.4
15* 142.13200 可変
16 ∞ 0.90000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第2面
K=-8.33929E-01, A4= 6.02474E-05, A6= 5.14320E-07, A8=-3.69741E-09
A10= 2.97017E-11, A12= 0.00000E+00
第5面
K= 2.55396E+00, A4=-2.77018E-04, A6=-8.65400E-06, A8= 1.94516E-07
A10=-1.20753E-08, A12= 0.00000E+00
第9面
K= 1.02267E-01, A4=-2.26353E-04, A6= 5.35520E-06, A8=-5.40727E-07
A10= 1.65403E-08, A12= 0.00000E+00
第15面
K= 0.00000E+00, A4= 5.39823E-05, A6= 8.65875E-06, A8=-1.14875E-06
A10= 6.05261E-08, A12=-1.19039E-09
ズーム比 2.34513
広角 中間 望遠
焦点距離 5.2746 8.0479 12.3696
Fナンバー 2.07200 2.42052 2.90092
画角 45.4615 31.4763 21.1596
像高 4.6250 4.6250 4.6250
レンズ全長 53.8431 45.0390 41.0317
BF 0.89382 0.88677 0.87271
d4 20.6391 9.1232 1.5000
d7 4.4541 4.1301 3.0000
d13 4.6411 6.4485 8.6880
d15 3.6590 4.8944 7.4150
ズームレンズ群データ
群 始面 焦点距離
1 1 -15.40155
2 5 44.99112
3 8 17.94798
4 14 23.13547
数値実施例13のズームレンズ系は、図35に示した実施の形態13に対応する。数値実施例13のズームレンズ系の面データを表35に、非球面データを表36に、各種データを表37に示す。
面番号 r d nd vd
物面 ∞
1 74.15600 1.85000 1.74993 45.4
2* 7.58000 3.85300
3 12.45500 2.10000 1.92286 20.9
4 17.84100 可変
5* 13.34800 2.25500 1.80359 40.8
6 -18.64600 0.00500 1.56732 42.8
7 -18.64600 0.50000 1.80610 33.3
8 16.85000 可変
9(絞り) ∞ 0.30000
10* 10.88900 3.00000 1.68863 52.8
11 -48.29500 0.58200
12 11.19600 1.71300 1.83481 42.7
13 -12.55000 0.00500 1.56732 42.8
14 -12.55000 0.43900 1.71736 29.5
15 5.79600 可変
16 15.38300 1.36400 1.60602 57.4
17* -289.01800 可変
18 ∞ 0.90000 1.51680 64.2
19 ∞ (BF)
像面 ∞
第2面
K=-1.85142E+00, A4= 3.96910E-04, A6=-1.32061E-06, A8= 1.62746E-08
A10=-4.52082E-11, A12= 2.52047E-26
第5面
K= 3.92686E+00, A4=-2.20840E-04, A6=-6.53734E-06, A8= 1.49216E-07
A10=-7.69756E-09, A12=-7.32507E-28
第10面
K=-1.06936E-01, A4=-2.13740E-04, A6= 5.10378E-06, A8=-5.19377E-07
A10= 1.61556E-08, A12= 0.00000E+00
第17面
K= 0.00000E+00, A4= 3.22743E-05, A6= 5.56174E-06, A8=-9.74806E-07
A10= 6.08346E-08, A12=-1.46950E-09
ズーム比 2.34773
広角 中間 望遠
焦点距離 5.2691 8.0454 12.3704
Fナンバー 2.07001 2.35450 2.77182
画角 45.5749 31.4639 21.0274
像高 4.6250 4.6250 4.6250
レンズ全長 56.5780 44.7974 38.7099
BF 0.87800 0.87842 0.87352
d4 23.3636 9.7995 1.5000
d8 5.0995 4.5171 3.0000
d15 4.2965 5.2005 6.5542
d17 4.0744 5.5359 7.9162
ズームレンズ群データ
群 始面 焦点距離
1 1 -17.39958
2 5 60.06224
3 9 16.18585
4 16 24.14170
数値実施例14のズームレンズ系は、図38に示した実施の形態14に対応する。数値実施例14のズームレンズ系の面データを表38に、非球面データを表39に、各種データを表40に示す。
面番号 r d nd vd
物面 ∞
1 120.24000 1.70000 1.80470 41.0
2* 7.76000 4.30900
3 14.85900 1.80000 1.94595 18.0
4 23.49400 可変
5* 11.62700 1.52000 1.80359 40.8
6 142.85700 0.00500 1.56732 42.8
7 142.85700 0.50000 1.80610 33.3
8 13.32300 可変
9(絞り) ∞ 0.30000
10* 12.80100 3.00000 1.68863 52.8
11 -36.79400 1.56900
12 10.37200 1.76800 1.83481 42.7
13 -13.18500 0.00500 1.56732 42.8
14 -13.18500 0.40000 1.75520 27.5
15 6.10400 可変
16 18.91900 1.45800 1.60602 57.4
17* -49.23900 可変
18 ∞ 0.90000 1.51680 64.2
19 ∞ (BF)
像面 ∞
第2面
K=-2.28649E+00, A4= 4.25785E-04, A6=-2.79189E-06, A8= 2.37543E-08
A10=-9.54904E-11, A12=-1.07445E-15
第5面
K= 3.61159E+00, A4=-3.16565E-04, A6=-9.25957E-06, A8= 1.86987E-07
A10=-1.62320E-08, A12=-4.80450E-19
第10面
K= 7.70809E-02, A4=-1.57049E-04, A6= 3.10975E-06, A8=-3.50418E-07
A10= 1.07860E-08, A12= 0.00000E+00
第17面
K= 0.00000E+00, A4= 8.39459E-06, A6= 8.89406E-06, A8=-1.18450E-06
A10= 6.69475E-08, A12=-1.46950E-09
ズーム比 2.34652
広角 中間 望遠
焦点距離 5.2750 8.0447 12.3780
Fナンバー 2.07998 2.40399 2.80753
画角 45.1600 31.3231 20.9681
像高 4.6250 4.6250 4.6250
レンズ全長 56.7415 46.7922 41.1921
BF 0.89182 0.87805 0.89672
d4 20.5042 8.5076 1.5000
d8 7.0596 5.9981 3.0000
d15 4.3377 6.1230 7.5808
d17 4.7142 6.0515 8.9806
ズームレンズ群データ
群 始面 焦点距離
1 1 -15.71457
2 5 75.06879
3 9 16.54470
4 16 22.73649
G2 第2レンズ群
G3 第3レンズ群
G4 第4レンズ群
L1 第1レンズ素子
L2 第2レンズ素子
L3 第3レンズ素子
L4 第4レンズ素子
L5 第5レンズ素子
L6 第6レンズ素子
L7 第7レンズ素子
L8 第8レンズ素子
A 開口絞り
P 平行平板
S 像面
1 ズームレンズ系
2 撮像素子
3 液晶モニタ
4 筐体
5 主鏡筒
6 移動鏡筒
7 円筒カム
Claims (22)
- 物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
以下の条件(I-1)を満足する、ズームレンズ系:
2ωW/FW≧34 ・・・(I-1)
(ただし、fT/fW>2.0)
ここで、
ωW:広角端での半画角(°)、
FW:広角端でのFナンバー、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。 - ズーミングに際して、各レンズ群の間隔が変化するように、前記第1レンズ群と、前記第2レンズ群と、前記第3レンズ群と、前記第4レンズ群とが、すべて光軸に沿った方向に移動する、請求項1に記載のズームレンズ系。
- 前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなる、請求項1に記載のズームレンズ系。
- 以下の条件(I-2)を満足する、請求項1に記載のズームレンズ系:
1.0<|fG1/fW|<4.0 ・・・(I-2)
(ただし、fT/fW>2.0)
ここで、
fG1:第1レンズ群の焦点距離、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。 - 物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
以下の条件(I-1):
2ωW/FW≧34 ・・・(I-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
FW:広角端でのFナンバー、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足するズームレンズ系である、撮像装置。 - 物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
以下の条件(I-1):
2ωW/FW≧34 ・・・(I-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
FW:広角端でのFナンバー、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足するズームレンズ系である、カメラ。 - 物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(II-1)及び(II-2)を満足する、ズームレンズ系:
nd1P>1.85 ・・・(II-1)
νd1P<35 ・・・(II-2)
(ただし、ωW>35)
ここで、
nd1P:第1レンズ素子のd線に対する屈折率、
νd1P:第1レンズ素子のd線に対するアッベ数、
ωW:広角端での半画角(°)
である。 - 物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(II-1)及び(II-2):
nd1P>1.85 ・・・(II-1)
νd1P<35 ・・・(II-2)
(ただし、ωW>35)
(ここで、
nd1P:第1レンズ素子のd線に対する屈折率、
νd1P:第1レンズ素子のd線に対するアッベ数、
ωW:広角端での半画角(°)
である)を満足するズームレンズ系である、撮像装置。 - 物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(II-1)及び(II-2):
nd1P>1.85 ・・・(II-1)
νd1P<35 ・・・(II-2)
(ただし、ωW>35)
(ここで、
nd1P:第1レンズ素子のd線に対する屈折率、
νd1P:第1レンズ素子のd線に対するアッベ数、
ωW:広角端での半画角(°)
である)を満足するズームレンズ系である、カメラ。 - 物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(III-1)を満足する、ズームレンズ系:
ωW>35 ・・・(III-1)
(ただし、fT/fW>2.0)
ここで、
ωW:広角端での半画角(°)、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である。 - ズーミングに際して、各レンズ群の間隔が変化するように、前記第1レンズ群と、前記第2レンズ群と、前記第3レンズ群と、前記第4レンズ群とが、すべて光軸に沿った方向に移動する、請求項10に記載のズームレンズ系。
- 以下の条件(III,IV-6)を満足する、請求項10に記載のズームレンズ系:
0.5<fL1/fG1<0.8 ・・・(III,IV-6)
ここで、
fL1:第1レンズ素子の焦点距離、
fG1:第1レンズ群の焦点距離
である。 - 以下の条件(III,IV-7)を満足する、請求項10に記載のズームレンズ系:
1.5<|fL2/fG1|<4.0 ・・・(III,IV-7)
ここで、
fL2:第2レンズ素子の焦点距離、
fG1:第1レンズ群の焦点距離
である。 - 以下の条件(III,IV-8)を満足する、請求項10に記載のズームレンズ系:
0.15<|fL1/fL2|<4.00 ・・・(III,IV-8)
ここで、
fL1:第1レンズ素子の焦点距離、
fL2:第2レンズ素子の焦点距離、
である。 - 物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(III-1):
ωW>35 ・・・(III-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足するズームレンズ系である、撮像装置。 - 物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
以下の条件(III-1):
ωW>35 ・・・(III-1)
(ただし、fT/fW>2.0)
(ここで、
ωW:広角端での半画角(°)、
fT:望遠端での全系の焦点距離、
fW:広角端での全系の焦点距離
である)を満足するズームレンズ系である、カメラ。 - 物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
開口絞りが、前記第2レンズ群と前記第3レンズ群との間にある、ズームレンズ系。 - 以下の条件(III,IV-6)を満足する、請求項17に記載のズームレンズ系:
0.5<fL1/fG1<0.8 ・・・(III,IV-6)
ここで、
fL1:第1レンズ素子の焦点距離、
fG1:第1レンズ群の焦点距離
である。 - 以下の条件(III,IV-7)を満足する、請求項17に記載のズームレンズ系:
1.5<|fL2/fG1|<4.0 ・・・(III,IV-7)
ここで、
fL2:第2レンズ素子の焦点距離、
fG1:第1レンズ群の焦点距離
である。 - 以下の条件(III,IV-8)を満足する、請求項17に記載のズームレンズ系:
0.15<|fL1/fL2|<4.00 ・・・(III,IV-8)
ここで、
fL1:第1レンズ素子の焦点距離、
fL2:第2レンズ素子の焦点距離、
である。 - 物体の光学的な像を電気的な画像信号として出力可能な撮像装置であって、
物体の光学的な像を形成するズームレンズ系と、
該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
開口絞りが、前記第2レンズ群と前記第3レンズ群との間にあるズームレンズ系である、撮像装置。 - 物体の光学的な像を電気的な画像信号に変換し、変換された画像信号の表示及び記憶の少なくとも一方を行うカメラであって、
物体の光学的な像を形成するズームレンズ系と、該ズームレンズ系により形成された光学的な像を電気的な画像信号に変換する撮像素子とを含む撮像装置を備え、
前記ズームレンズ系が、
物体側から像側へと順に、負のパワーを有する第1レンズ群と、正のパワーを有する第2レンズ群と、正のパワーを有する第3レンズ群と、正のパワーを有する第4レンズ群とからなり、
ズーミングに際して、各レンズ群の間隔が変化するとともに、
前記第1レンズ群が、物体側から像側へと順に、負のパワーを有する第1レンズ素子と、正のパワーを有する第2レンズ素子との2枚のレンズ素子からなり、
開口絞りが、前記第2レンズ群と前記第3レンズ群との間にあるズームレンズ系である、カメラ。
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JP2015203735A (ja) * | 2014-04-11 | 2015-11-16 | 株式会社シグマ | 超広角ズームレンズ |
JP6909362B1 (ja) * | 2021-03-30 | 2021-07-28 | ジョウシュウシ レイテック オプトロニクス カンパニーリミテッド | ズームレンズ |
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JP5129821B2 (ja) * | 2008-01-28 | 2013-01-30 | パナソニック株式会社 | ズームレンズ系、撮像装置及びカメラ |
US9250422B2 (en) * | 2012-03-25 | 2016-02-02 | Iain A. Neil | Zoom lens with forward-located aperture stop |
CN103424846A (zh) * | 2012-05-18 | 2013-12-04 | 华晶科技股份有限公司 | 摄像用光学透镜组及其摄像装置 |
TWI475245B (zh) * | 2012-05-18 | 2015-03-01 | Altek Corp | 攝像用光學透鏡組及其攝像裝置 |
JP2014059480A (ja) * | 2012-09-18 | 2014-04-03 | Ricoh Co Ltd | ズームレンズ及びプロジェクタ |
KR102052126B1 (ko) * | 2013-07-09 | 2019-12-05 | 삼성전자주식회사 | 줌 렌즈 및 이를 포함한 촬영 장치 |
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JP2007327991A (ja) * | 2006-06-06 | 2007-12-20 | Olympus Imaging Corp | ズームレンズ及びそれを備えた撮像装置 |
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JP3590807B2 (ja) | 1995-03-08 | 2004-11-17 | 株式会社ニコン | ズームレンズ |
US5668668A (en) * | 1995-03-08 | 1997-09-16 | Nikon Corporation | Zoom lens with five lens groups |
JP2001188172A (ja) | 1999-12-28 | 2001-07-10 | Canon Inc | レトロフォーカス型のズームレンズ及びそれを有する光学機器 |
JP3805212B2 (ja) | 2001-06-11 | 2006-08-02 | キヤノン株式会社 | ズームレンズ及びそれを有する光学機器 |
US6888683B2 (en) * | 2001-05-17 | 2005-05-03 | Canon Kabushiki Kaisha | Zoom lens and camera |
JP3943922B2 (ja) | 2001-12-11 | 2007-07-11 | オリンパス株式会社 | 撮像装置 |
US8472125B2 (en) * | 2007-11-15 | 2013-06-25 | Konica Minolta Opto, Inc. | Variable power optical system, imaging device, and digital device |
JP5445307B2 (ja) * | 2009-05-19 | 2014-03-19 | コニカミノルタ株式会社 | 変倍光学系、撮像装置およびデジタル機器 |
JP5530868B2 (ja) * | 2009-09-11 | 2014-06-25 | パナソニック株式会社 | ズームレンズ系、撮像装置及びカメラ |
JP5543838B2 (ja) * | 2010-04-27 | 2014-07-09 | パナソニック株式会社 | ズームレンズ系、撮像装置及びカメラ |
-
2009
- 2009-06-23 US US13/001,236 patent/US8446520B2/en not_active Expired - Fee Related
- 2009-06-23 JP JP2010518889A patent/JPWO2010001545A1/ja active Pending
- 2009-06-23 WO PCT/JP2009/002852 patent/WO2010001545A1/ja active Application Filing
Patent Citations (1)
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JP2007327991A (ja) * | 2006-06-06 | 2007-12-20 | Olympus Imaging Corp | ズームレンズ及びそれを備えた撮像装置 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014126603A (ja) * | 2012-12-25 | 2014-07-07 | Ricoh Co Ltd | 投射用ズームレンズ、投射光学系および画像表示装置 |
JP2015203735A (ja) * | 2014-04-11 | 2015-11-16 | 株式会社シグマ | 超広角ズームレンズ |
JP6909362B1 (ja) * | 2021-03-30 | 2021-07-28 | ジョウシュウシ レイテック オプトロニクス カンパニーリミテッド | ズームレンズ |
Also Published As
Publication number | Publication date |
---|---|
US20110128418A1 (en) | 2011-06-02 |
US8446520B2 (en) | 2013-05-21 |
JPWO2010001545A1 (ja) | 2011-12-15 |
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