WO2011001663A1 - 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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- WO2011001663A1 WO2011001663A1 PCT/JP2010/004284 JP2010004284W WO2011001663A1 WO 2011001663 A1 WO2011001663 A1 WO 2011001663A1 JP 2010004284 W JP2010004284 W JP 2010004284W WO 2011001663 A1 WO2011001663 A1 WO 2011001663A1
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- Prior art keywords
- lens
- lens group
- object side
- lens element
- zoom lens
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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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
- G02B15/143—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only
- G02B15/1435—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative
- G02B15/143507—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having three groups only the first group being negative arranged -++
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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 -+++
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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
Definitions
- the present invention relates to a zoom lens system, an imaging device, and a camera.
- the present invention not only has a high resolution, but also has a short optical total length (lens total length), a large zoom ratio of about 5 times, and a wide angle with a field angle of about 82 ° at the wide angle end.
- the present invention relates to a zoom lens system that can be sufficiently adapted for photographing, an imaging device including the zoom lens system, and a thin and extremely compact camera including the imaging device.
- a first lens group having a negative power, a second lens group having a positive power, and a positive lens are sequentially arranged in order from the object side to the image side.
- Zoom with a short optical total length (lens total length: distance from the apex of the lens surface closest to the object side to the image plane in the entire lens system) in a negative lead type three-group configuration in which a third lens group having the same power is arranged
- Various lens systems have been proposed.
- Japanese Patent Application Laid-Open No. 2008-241794 has three negative and positive lens groups in order from the object side to the image side, and the distance between the lens groups changes at the time of zooming.
- the specific relationship between the focal length at the end, the imaging magnification at the telephoto end of the second lens group, and the focal length, Abbe number, partial dispersion ratio, refractive index, and radius of curvature of the lenses constituting the second lens group A zoom lens satisfying the above has been disclosed.
- the zoom lens disclosed in Japanese Patent Laid-Open No. 2008-241794 has a large angle of view at the wide-angle end and a relatively large zoom ratio.
- Japanese Patent Application Laid-Open No. 2007-140359 has at least two negative and positive lens groups in order from the object side to the image side, and the distance between the lens groups changes at the time of zooming, and constitutes the first lens group There is disclosed a zoom lens in which the refractive index, the focal length, and the radius of curvature satisfy a specific relationship.
- the zoom lens disclosed in Japanese Patent Application Laid-Open No. 2007-140359 has a reduced optical total length and has high optical performance over the entire zoom range.
- Japanese Patent Laid-Open No. 2006-227197 has three negative and positive lens groups in order from the object side to the image side, and the distance between the first and second lens groups is greater at the telephoto end than at the wide angle end. Each lens group is moved so as to decrease and the distance between the second and third lens groups increases, and zooming is performed.
- the first lens group is composed of two negative positive lenses
- the second lens group is positive and negative.
- the zoom lens disclosed in Japanese Patent Laid-Open No. 2006-227197 has a relatively large zoom ratio while maintaining desired optical performance.
- Japanese Patent No. 3589555 has three negative and positive lens groups in order from the object side to the image side.
- the first lens group moves in a convex miracle toward the image side.
- the lens group moves monotonically toward the object side, and the third lens group moves along a convex miracle toward the object side.
- a zoom lens is disclosed in which the focal length satisfies a specific relationship.
- the optical total length is shortened, and distortion is suppressed with a small number of lenses.
- Japanese Patent No. 3868092 has three negative and positive lens groups in order from the object side to the image side. During zooming, the first lens group moves in a convex miracle toward the image side. When moving from the wide-angle end to the telephoto end, the lens group moves monotonically toward the object side, and the third lens group moves along a convex miracle toward the object side. A zoom lens is disclosed in which the focal length satisfies a specific relationship. The zoom lens disclosed in Japanese Patent No. 3868092 has a reduced optical total length and suppresses distortion with a small number of lenses.
- the zoom lens disclosed in Japanese Patent Application Laid-Open No. 2008-241794 has high optical performance, has a large field angle of 75 ° at the wide-angle end, and a large zoom ratio of 6 to 8 times. Since the lens configuration increases the amount of movement of the second lens group on the optical axis, the total optical length is long, and it is not possible to further reduce the thickness of a compact digital camera.
- the zoom lens disclosed in Japanese Patent Application Laid-Open No. 2007-140359 has a short optical total length, so that it is possible to further reduce the thickness of a compact digital camera. It is not possible to satisfy the demand for a compact type digital camera which is as small as 56 ° and has a large zoom ratio in recent years.
- the zoom lens disclosed in Japanese Patent Laid-Open No. 2006-227197 has high optical performance and a large zoom ratio of about 5 times, as with the zoom lens disclosed in Japanese Patent Laid-Open No. 2007-140359, a wide-angle lens is disclosed.
- the angle of view at the edge is also as small as 60 °, and it cannot satisfy the recent demand for a digital camera corresponding to a wide angle of view.
- the zoom lens disclosed in Japanese Patent No. 3589555 is similar to the zoom lens disclosed in Japanese Patent Application Laid-Open No. 2007-140359, and since the total optical length is short, a compact digital camera can be made thinner.
- the ratio is as small as about three times, and the demand for a compact type digital camera having a large zoom ratio in recent years cannot be satisfied.
- the zoom lens disclosed in Japanese Patent No. 3868092 is similar to the zoom lens disclosed in Japanese Patent Laid-Open No. 2007-140359 and Japanese Patent No. 3589555, and the optical total length is short, so that a compact digital camera can be made thinner.
- the zoom ratio is as small as about 3 times, and the demand for a compact type digital camera whose zoom ratio has been increasing in recent years cannot be satisfied.
- the object of the present invention is not only high in resolution, but also has a short optical total length, a large zoom ratio of about 5 times, and an angle of view at the wide angle end of about 82 °, which is sufficient for wide angle photography.
- a zoom lens system that can be adapted to the zoom lens system, an imaging apparatus including the zoom lens system, and a thin and extremely compact camera including the imaging apparatus.
- zoom lens system having a plurality of lens groups each composed of at least one lens element, From the object side to the image side, A first lens group having negative power and comprising at least two lens elements; A second lens group having a positive power, During zooming from the wide-angle end to the telephoto end during imaging, zooming is performed by moving each lens group along the optical axis so that the distance between the first lens group and the second lens group decreases.
- the present invention An imaging apparatus capable of outputting an optical image of an object as an electrical image signal, A zoom lens system that forms an optical image of the object; An image sensor that converts an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is Having a plurality of lens groups composed of at least one lens element; From the object side to the image side, A first lens group having negative power and comprising at least two lens elements; A second lens group having a positive power, During zooming from the wide-angle end to the telephoto end during imaging, zooming is performed by moving each lens group along the optical axis so that the distance between the first lens group and the second lens group decreases.
- the present invention relates to an imaging apparatus that is a zoom lens system that satisfies the above.
- the present invention A camera that converts an optical image of an object into an electrical image signal, and displays and stores the converted image signal;
- An image pickup apparatus including a zoom lens system that forms an optical image of an object, and an image sensor that converts an optical image formed by the zoom lens system into an electrical image signal;
- the zoom lens system is Having a plurality of lens groups composed of at least one lens element; From the object side to the image side, A first lens group having negative power and comprising at least two lens elements; A second lens group having a positive power, During zooming from the wide-angle end to the telephoto end during imaging, zooming is performed by moving each lens group along the optical axis so that the distance between the first lens group and the second lens group decreases.
- the zoom ratio is as large as about 5 times, and the angle of view at the wide angle end is about 82 °, which is sufficient for wide angle photography. It is possible to provide a zoom lens system that can be adapted to the above. Furthermore, according to the present invention, an imaging device including the zoom lens system and a thin and extremely compact camera including the imaging device can be provided.
- FIG. 1 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 1 (Example 1).
- FIG. 2 is a longitudinal aberration diagram of the zoom lens system according to Example 1 when the zoom lens system is in focus at infinity.
- 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 the telephoto end of the zoom lens system according to Example 1.
- FIG. 4 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 2 (Example 2).
- FIG. 5 is a longitudinal aberration diagram of the zoom lens system according to Example 2 when the zoom lens system is in focus at infinity.
- FIG. 5 is a longitudinal aberration diagram of the zoom lens system according to Example 2 when the zoom lens system is in focus at infinity.
- FIG. 6 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of the zoom lens system according to Example 2.
- FIG. 7 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 3 (Example 3).
- FIG. 8 is a longitudinal aberration diagram of the zoom lens system according to Example 3 when the zoom lens system is in focus at infinity.
- FIG. 9 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of the zoom lens system according to Example 3.
- FIG. 10 is a lens layout diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 4 (Example 4).
- FIG. 11 is a longitudinal aberration diagram of the zoom lens system according to Example 4 when the zoom lens system is in focus at infinity.
- 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 the telephoto end of a zoom lens system according to Example 4.
- FIG. 13 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 5 (Example 5).
- FIG. 14 is a longitudinal aberration diagram of the zoom lens system according to Example 5 when the zoom lens system is in focus at infinity.
- FIG. 15 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of a zoom lens system according to Example 5.
- 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 the telephoto end of a zoom lens system according to Example 4.
- FIG. 12 is a lateral
- FIG. 16 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 6 (Example 6).
- FIG. 17 is a longitudinal aberration diagram of the zoom lens system according to Example 6 at an infinite focus state.
- FIG. 18 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of a zoom lens system according to Example 6.
- FIG. 19 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 7 (Example 7).
- FIG. 20 is a longitudinal aberration diagram of the zoom lens system according to Example 7 at the infinite focus state.
- FIG. 21 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state, at the telephoto end of a zoom lens system according to Example 7.
- FIG. 22 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 8 (Example 8).
- FIG. 23 is a longitudinal aberration diagram of the zoom lens system according to Example 8 when the zoom lens system is in focus at infinity.
- 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 the telephoto end of a zoom lens system according to Example 8.
- FIG. 25 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 9 (Example 9).
- FIG. 9 Example 9
- FIG. 26 is a longitudinal aberration diagram of the zoom lens system according to Example 9 at the infinite focus state.
- FIG. 27 is a lateral aberration diagram in a basic state where image blur correction is not performed and in an image blur correction state at the telephoto end of a zoom lens system according to Example 9.
- FIG. 28 is a lens arrangement diagram illustrating an infinitely focused state of the zoom lens system according to Embodiment 10 (Example 10).
- FIG. 29 is a longitudinal aberration diagram of the zoom lens system according to Example 10 when the zoom lens system is in focus at infinity.
- 30 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 end of a zoom lens system according to Example 10.
- FIG. FIG. 31 is a schematic configuration diagram of a digital still camera according to Embodiment 11. In FIG.
- Embodiments 1 to 10 1, 4, 7, 10, 13, 16, 19, 22, 25, and 28 are lens arrangement diagrams of the zoom lens systems according to Embodiments 1 to 10, respectively, all in an infinite focus state. A zoom lens system is shown.
- the lens configuration of T )) and (c) show the lens configuration at the telephoto end (longest focal length state: focal length f T ).
- the broken line arrows provided between FIGS. (A) and (b) are obtained by connecting the positions of the lens groups in the wide-angle end, the intermediate position, and the telephoto end in order from the top. Straight line.
- the arrow attached to the lens group represents the focusing from the infinite focus state to the close object focus state. That is, the moving direction during focusing from the infinitely focused state to the close object focused state is shown.
- an asterisk * attached to a specific surface indicates that the surface is aspherical.
- a symbol (+) and a symbol ( ⁇ ) attached to a symbol of each lens group correspond to a power symbol of each lens group.
- the straight line described on the rightmost side represents the position of the image plane S, and the object side of the image plane S (between the image plane S and the most image side lens plane of the third lens group G3 or an image).
- a parallel flat plate equivalent to an optical low-pass filter, a face plate of an image sensor, or the like is provided between the surface S and the most image side lens surface of the fourth lens group G4.
- an aperture stop A is provided between the second lens group G2 and the third lens group G3.
- the aperture stop A moves on the optical axis integrally with the second lens group G2 during zooming from the wide-angle end to the telephoto end during photographing.
- the first lens group G1 is a negative meniscus first lens element L1 having a convex surface directed toward the object side in order from the object side to the image side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens group G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side.
- the fourth lens element L4 having a positive meniscus shape
- the fifth lens element L5 having a negative meniscus shape having a convex surface facing the object side
- the sixth lens element L6 having a biconvex shape.
- the 4th lens element L4 and the 5th lens element L5 are joined, and in the surface data in the corresponding numerical value example mentioned later, adhesion between these 4th lens element L4 and the 5th lens element L5 Surface number 8 is given to the agent layer.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- the seventh lens element L7 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the seventh lens element L7).
- the zoom lens system according to Embodiment 1 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 monotonously moves toward the object side, and the third lens group G3 monotonously moves toward the image side. That is, during zooming, each lens group is placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens unit G1 includes a negative meniscus first lens element L1 having a convex surface directed toward the object side in order from the object side to the image side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens group G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side.
- the fourth lens element L4 having a positive meniscus shape
- the fifth lens element L5 having a negative meniscus shape having a convex surface facing the object side
- the sixth lens element L6 having a biconvex shape.
- the 4th lens element L4 and the 5th lens element L5 are joined, and in the surface data in the corresponding numerical value example mentioned later, adhesion between these 4th lens element L4 and the 5th lens element L5 Surface number 8 is given to the agent layer.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- the seventh lens element L7 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the seventh lens element L7).
- the zoom lens system according to Embodiment 2 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 monotonously moves toward the object side, and the third lens group G3 moves toward the image side while drawing a convex locus on the object side. That is, during zooming, each lens group is placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens group G1 is a negative meniscus first lens element L1 having a convex surface directed toward the object side in order from the object side to the image side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens group G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side.
- the fourth lens element L4 having a positive meniscus shape
- the fifth lens element L5 having a negative meniscus shape having a convex surface facing the object side
- the sixth lens element L6 having a biconvex shape.
- the 4th lens element L4 and the 5th lens element L5 are joined, and in the surface data in the corresponding numerical value example mentioned later, adhesion between these 4th lens element L4 and the 5th lens element L5 Surface number 8 is given to the agent layer.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- the seventh lens element L7 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the seventh lens element L7).
- the zoom lens system according to Embodiment 3 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 monotonously moves toward the object side, and the third lens group G3 moves toward the image side while drawing a convex locus on the object side. That is, during zooming, each lens group is placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens unit G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface directed toward the object side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens unit G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side.
- the fourth lens element L4 having a positive meniscus shape
- the fifth lens element L5 having a negative meniscus shape having a convex surface facing the object side
- the sixth lens element L6 having a biconvex shape.
- the 4th lens element L4 and the 5th lens element L5 are joined, and in the surface data in the corresponding numerical value example mentioned later, adhesion between these 4th lens element L4 and the 5th lens element L5 Surface number 8 is given to the agent layer.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- the seventh lens element L7 has two aspheric surfaces.
- the seventh lens element L7 is made of a resin material.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the seventh lens element L7).
- the zoom lens system according to Embodiment 4 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 monotonously moves toward the object side, and the third lens group G3 moves toward the image side while drawing a convex locus on the object side. That is, during zooming, each lens group is placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens unit G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface directed toward the object side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens unit G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side. And a negative meniscus fourth lens element L4 directed toward the object, a negative meniscus fifth lens element L5 having a convex surface directed toward the object side, and a biconvex sixth lens element L6.
- the third lens element L3 and the fourth lens element L4 are joined, and the fifth lens element L5 and the sixth lens element L6 are joined.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the seventh lens element L7).
- the zoom lens system according to Embodiment 5 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 monotonously moves toward the object side, and the third lens group G3 moves toward the image side while drawing a convex locus on the object side. That is, during zooming, each lens group is placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens unit G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 having a convex surface directed toward the object side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens group G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side.
- the fourth lens element L4 having a positive meniscus shape
- the fifth lens element L5 having a negative meniscus shape having a convex surface facing the object side
- the sixth lens element L6 having a biconvex shape.
- the 4th lens element L4 and the 5th lens element L5 are joined, and in the surface data in the corresponding numerical value example mentioned later, adhesion between these 4th lens element L4 and the 5th lens element L5 Surface number 8 is given to the agent layer.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- the seventh lens element L7 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the seventh lens element L7).
- the zoom lens system according to Embodiment 6 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 monotonously moves toward the object side, and the third lens group G3 monotonously moves toward the image side. That is, during zooming, each lens group is placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens unit G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 with a convex surface directed toward the object side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens unit G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side.
- the fourth lens element L4 having a positive meniscus shape
- the fifth lens element L5 having a negative meniscus shape having a convex surface facing the object side
- the sixth lens element L6 having a biconvex shape.
- the 4th lens element L4 and the 5th lens element L5 are joined, and in the surface data in the corresponding numerical value example mentioned later, adhesion between these 4th lens element L4 and the 5th lens element L5 Surface number 8 is given to the agent layer.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- the seventh lens element L7 has two aspheric surfaces.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the seventh lens element L7).
- the zoom lens system according to Embodiment 7 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 monotonously moves toward the object side, and the third lens group G3 monotonously moves toward the image side. That is, during zooming, each lens group is placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens unit G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 with a convex surface directed toward the object side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens unit G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side. And a negative meniscus fourth lens element L4 directed toward the object, a negative meniscus fifth lens element L5 having a convex surface directed toward the object side, and a biconvex sixth lens element L6.
- the third lens element L3 and the fourth lens element L4 are joined, and the fifth lens element L5 and the sixth lens element L6 are joined.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the seventh lens element L7).
- the zoom lens system according to Embodiment 8 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 monotonously moves toward the object side, and the third lens group G3 moves toward the image side while drawing a convex locus on the object side. That is, during zooming, each lens group is placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens unit G1 includes a negative meniscus first lens element L1 with a convex surface directed toward the object side in order from the object side to the image side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens unit G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side.
- the fourth lens element L4 having a positive meniscus shape
- the fifth lens element L5 having a negative meniscus shape having a convex surface facing the object side
- the sixth lens element L6 having a biconvex shape.
- the 4th lens element L4 and the 5th lens element L5 are joined, and in the surface data in the corresponding numerical value example mentioned later, adhesion between these 4th lens element L4 and the 5th lens element L5 Surface number 8 is given to the agent layer.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- the seventh lens element L7 has two aspheric surfaces.
- the fourth lens unit G4 comprises solely a positive meniscus eighth lens element L8 with the convex surface facing the object side.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the eighth lens element L8).
- the zoom lens system according to Embodiment 9 during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 moves monotonously to the object side, the third lens group G3 moves monotonously to the image side, and the fourth lens group G4 is fixed with respect to the image plane S. That is, during zooming, the first lens group G1, the second lens group G2, the first lens group G1, the second lens group G2, and the first lens group G1, the second lens group G3 are increased so that the distance between the second lens group G2 and the third lens group G3 increases. The second lens group G2 and the third lens group G3 move along the optical axis.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens unit G1 includes, in order from the object side to the image side, a negative meniscus first lens element L1 with a convex surface directed toward the object side. And a positive meniscus second lens element L2 having a convex surface facing the object side.
- the first lens element L1 has two aspheric surfaces.
- the second lens group G2 includes, in order from the object side to the image side, a positive meniscus third lens element L3 with a convex surface facing the object side, and a convex surface facing the object side.
- the fourth lens element L4 having a positive meniscus shape
- the fifth lens element L5 having a negative meniscus shape having a convex surface facing the object side
- the sixth lens element L6 having a biconvex shape.
- the 4th lens element L4 and the 5th lens element L5 are joined, and in the surface data in the corresponding numerical value example mentioned later, adhesion between these 4th lens element L4 and the 5th lens element L5 Surface number 8 is given to the agent layer.
- the third lens element L3 has an aspheric object side surface.
- the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
- a parallel plate P is provided on the object side of the image plane S (between the image plane S and the seventh lens element L7).
- the zoom lens system In the zoom lens system according to Embodiment 10, during zooming from the wide-angle end to the telephoto end during imaging, the first lens group G1 moves toward the object side along a locus convex to the image side, and the second lens The group G2 monotonously moves toward the object side, and the third lens group G3 moves toward the image side while drawing a convex locus on the object side. That is, during zooming, each lens group is placed on the optical axis so that the distance between the first lens group G1 and the second lens group G2 decreases and the distance between the second lens group G2 and the third lens group G3 increases. Move along each.
- the third lens group G3 moves toward the object side along the optical axis.
- the first lens group G1 has, in order from the object side to the image side, a lens element having negative power, a positive power, and a convex surface on the object side. Therefore, a short optical total length can be realized while satisfactorily correcting various aberrations, particularly distortion at the wide-angle end.
- the first lens group G1 includes at least one lens element having an aspheric surface, or includes at least two aspheric surfaces. Therefore, aberrations are further improved. Can be corrected.
- the third lens group G3 is composed of one lens element, the total number of lens elements is reduced and the lens system has a short optical total length. .
- one lens element constituting the third lens group G3 includes an aspherical surface, aberration can be corrected more satisfactorily.
- the second lens group G2 is composed of four lens elements including one or two sets of cemented lens elements therein, the second lens group The lens system has a small G2 thickness and a short optical total length.
- any one of the lens groups constituting the zoom lens system or a part of the sub-lens groups of each lens group is orthogonal to the optical axis.
- Image blur can be corrected while maintaining excellent imaging characteristics with small decentration coma and decentering astigmatism.
- one lens group is composed of a plurality of lens elements
- a part of the sub-lens groups of each lens group is any one of the plurality of lens elements or adjacent to each other.
- a zoom lens system such as the zoom lens systems according to Embodiments 1 to 10
- a plurality of preferable conditions are defined for the zoom lens system according to each embodiment, but a zoom lens system configuration that satisfies all of the plurality of conditions is most desirable.
- individual conditions it is possible to obtain a zoom lens system that exhibits the corresponding effects.
- f W / D 1 > 7.5
- f W focal length of the entire system at the wide-angle end
- D 1 is the center thickness of the lens element located on the most object side of the first lens group.
- the condition (1) is a condition for defining the thickness of the lens element located on the most object side of the first lens group in the optical axis direction. If the lower limit of the condition (1) is not reached, the thickness of the lens element located on the most object side of the first lens group in the optical axis direction increases, and the overall length of the zoom lens system becomes longer. It becomes difficult to provide an imaging device and a camera.
- condition (1) and (1) ′ are satisfied simultaneously with the condition (a).
- f T / D 1 focal length of the entire system at the telephoto end
- D 1 is the center thickness of the lens element located on the most object side of the first lens group.
- the condition (2) is a condition for defining the thickness in the optical axis direction of the lens element located on the most object side of the first lens group. If the lower limit of the condition (2) is not reached, the thickness of the lens element located on the most object side of the first lens group increases in the optical axis direction, and the overall length of the zoom lens system becomes longer. It becomes difficult to provide an imaging device and a camera.
- the condition (3) is a condition for defining the thickness of the first lens group in the optical axis direction.
- the thickness of the first lens group in the optical axis direction increases, and the overall length of the zoom lens system increases, so that a compact lens barrel, imaging device, and camera can be provided. It becomes difficult. If the lower limit of the condition (3) is not reached, the curvature of field becomes large, and it becomes difficult to ensure the peripheral performance.
- the above effect can be further achieved by further satisfying at least one of the following conditions (3) ′ and (3) ′′. 0.65 ⁇ D G1 / Ir (3) ′ D G1 /Ir ⁇ 1.00 (3) ''
- a third lens group having a positive power is provided on the image side of the second lens group, and from the wide-angle end to the telephoto end during imaging.
- a zoom lens system that performs zooming by moving each lens unit along the optical axis so as to increase the distance between the second lens unit and the third lens unit during zooming is as follows. It is desirable to satisfy (4).
- D G1 center thickness of the first lens group
- D G3 Center thickness of the third lens group
- the condition (4) is a condition for defining the sum of the thickness of the first lens group in the optical axis direction and the thickness of the third lens group in the optical axis direction. If the upper limit of condition (4) is exceeded, the sum of the thickness in the optical axis direction of the first lens group and the thickness in the optical axis direction of the third lens group becomes large, and the overall length of the zoom lens system becomes long. It is difficult to provide a simple lens barrel, imaging device, and camera. If the lower limit of the condition (4) is not reached, the curvature of field becomes large, and it becomes difficult to ensure the peripheral performance.
- the above effect can be further achieved by satisfying at least one of the following conditions (4) ′ and (4) ′′. 0.75 ⁇ (D G1 + D G3 ) / Ir (4) ′ (D G1 + D G3 ) / Ir ⁇ 1.20 (4) ''
- D 1 the center thickness of the lens element located on the most object side of the first lens group
- D 12 is an air space between a lens element located on the most object side of the first lens group and a lens element adjacent to the lens element located on the most object side.
- the condition (5) is a condition for defining the thickness in the optical axis direction of the lens element located on the most object side of the first lens group. If the upper limit of condition (5) is exceeded, the thickness of the lens element located on the most object side of the first lens group in the optical axis direction increases, and the overall length of the zoom lens system becomes longer. It becomes difficult to provide an imaging device and a camera. If the lower limit of the condition (5) is not reached, the air space between the lens element located on the most object side of the first lens group and the lens element located on the most object side and the adjacent lens element becomes large, and the zoom lens Since the total length of the system becomes long, it becomes difficult to provide a compact lens barrel, imaging device, and camera.
- D 2 the center thickness of the lens element adjacent to the lens element located on the most object side of the first lens group
- R 2F radius of curvature of the object side surface of the lens element adjacent to the lens element located on the most object side of the first lens group
- R 2R the radius of curvature of the image side surface of the lens element adjacent to the lens element located on the most object side of the first lens group
- the condition (6) is a condition for defining the thickness in the optical axis direction of the lens element adjacent to the lens element located on the most object side of the first lens group. If the upper limit of condition (6) is exceeded, the thickness of the lens element adjacent to the most object side of the first lens group in the optical axis direction increases, and the overall length of the zoom lens system becomes longer. It is difficult to provide a simple lens barrel, imaging device, and camera. If the lower limit of the condition (6) is not reached, the thickness in the optical axis direction at the outer portion of the lens element adjacent to the lens element located on the most object side of the first lens group becomes small, and the necessary lens diameter is secured. It becomes difficult.
- the above effect can be further achieved by further satisfying at least one of the following conditions (6) ′ and (6) ′′.
- condition (a) it is particularly preferable that the conditions (6), (6) ′ and (6) ′′ are satisfied simultaneously with the condition (a).
- the second lens group includes at least one pair of cemented lens elements, and the cemented surface of the cemented lens element has a convex shape on the object side. It is desirable that a certain zoom lens system satisfies the following condition (7). 1.03 ⁇ Nd 2 / Nd 1 ⁇ 2.00 (7) here, Nd 1 : Refractive index with respect to d-line of the lens element located on the most object side of the cemented lens element, Nd 2 is a refractive index with respect to the d-line of the lens element that is cemented with the lens element located on the most object side of the cemented lens element.
- the condition (7) is for defining the relationship between the refractive index of the lens element located on the most object side of the cemented lens element included in the second lens group and the refractive index of the lens element cemented thereto. It is a condition. If the condition (7) is not satisfied, it is difficult to correct various aberrations, particularly spherical aberration.
- the above effect can be further achieved by satisfying at least one of the following conditions (7) ′ and (7) ′′. 1.15 ⁇ Nd 2 / Nd 1 (7) ′ Nd 2 / Nd 1 ⁇ 1.50 ⁇ (7) ''
- the zoom lens system in which the third lens group includes one lens element satisfies the following condition (8). desirable. 0.5 ⁇ ((2 ⁇ D 7 ⁇ R 7F ⁇ R 7R ) / (R 7R ⁇ R 7F )) 0.5 /Ir ⁇ 1.5 ...
- D 7 Center thickness of the lens element of the third lens group
- R 7F radius of curvature of the object side surface of the lens element of the third lens group
- R 7R radius of curvature of the image side surface of the lens element of the third lens group
- the condition (8) is a condition for defining the thickness in the optical axis direction of the lens elements constituting the third lens group. If the upper limit of the condition (8) is exceeded, the thickness of the lens elements constituting the third lens group increases in the optical axis direction, and the overall length of the zoom lens system becomes longer. Therefore, a compact lens barrel, imaging device, camera It will be difficult to provide. If the lower limit of the condition (8) is not reached, the thickness in the optical axis direction at the outer portion of the lens elements constituting the third lens group becomes small, and it becomes difficult to ensure the necessary lens diameter.
- condition (8) is particularly preferably satisfied simultaneously with the condition (a).
- the zoom lens system in which the second lens group moves in the direction perpendicular to the optical axis has the following conditions (9) and (10) It is desirable to satisfy in all systems.
- the conditions (9) and (10) are conditions related to the movement amount at the time of maximum blur correction of the second lens group moving in the direction perpendicular to the optical axis.
- the condition (9) is not satisfied or when the upper limit of the condition (10) is exceeded, the blur correction becomes excessive, and the optical performance may be greatly deteriorated.
- the lower limit of the condition (10) is not reached, there is a possibility that the shake cannot be corrected sufficiently.
- the above effect can be further achieved by further satisfying at least one of the following conditions (10) ′ and (10) ′′. 2.0 ⁇ (Y / Y T ) / (f / f T ) (10) ′ (Y / Y T ) / (f / f T ) ⁇ 2.6 (10) ''
- Each lens group of the zoom lens system according to each embodiment includes only a refractive lens element that deflects incident light by refraction (that is, a lens element that deflects at the interface between media having different refractive indexes).
- a diffractive lens element that deflects incident light by diffraction a refractive lens element that deflects incident light by diffraction
- a refractive / diffractive hybrid lens element that deflects incident light by a combination of diffractive action and refractive action
- Each lens group may be composed of a distributed lens element or the like.
- the object side of the image surface S (between the image surface S and the most image side lens surface of the third lens group G3 or between the image surface S and the most image side lens surface of the fourth lens group G4).
- Between a configuration in which a parallel flat plate equivalent to an optical low-pass filter, a face plate of an image sensor, or the like is disposed.
- the low-pass filter a crystal having a predetermined crystal axis direction adjusted is used as a material.
- a birefringent low-pass filter that achieves the required optical cut-off frequency characteristics by a diffraction effect can be applied.
- FIG. 31 is a schematic configuration diagram of a digital still camera according to Embodiment 11.
- the digital still camera includes an image pickup apparatus including a zoom lens system 1 and an image pickup device 2 that is a CCD, a liquid crystal monitor 3, and a housing 4.
- the zoom lens system 1 As the zoom lens system 1, the zoom lens system according to Embodiment 1 is used.
- the zoom lens system 1 includes a first lens group G1, a second lens group G2, an aperture stop A, and a third lens group G3.
- the zoom lens system 1 is disposed on the front side, and the imaging element 2 is disposed on the rear side of the zoom lens system 1.
- a liquid crystal monitor 3 is disposed on the rear side of the housing 4, and an optical image of the subject by the zoom lens system 1 is formed on the image plane S.
- the lens barrel is composed of a main lens barrel 5, a movable lens barrel 6, and a cylindrical cam 7.
- the first lens group G1, the second lens group G2, the aperture stop A, and the third lens group G3 move to predetermined positions with reference to the image sensor 2, and from the wide-angle end to the telephoto end. Zooming can be performed.
- the third lens group G3 is movable in the optical axis direction by a focus adjustment motor.
- any of the zoom lens systems according to Embodiments 2 to 10 may be used instead of the zoom lens system according to Embodiment 1.
- the optical system of the digital still camera shown in FIG. 31 can also be used for a digital video camera for moving images. In this case, not only a still image but also a moving image with high resolution can be taken.
- the zoom lens system according to the first to tenth embodiments is shown as the zoom lens system 1.
- these zoom lens systems need to use all zooming areas. There is no. That is, a range in which the optical performance is ensured according to a desired zooming area may be cut out and used as a zoom lens system having a lower magnification than the zoom lens system described in Embodiments 1 to 10.
- the zoom lens system is applied to a so-called retractable lens barrel
- a prism having an internal reflection surface or a surface reflection mirror may be disposed at an arbitrary position such as in the first lens group G1, and the zoom lens system may be applied to a so-called bent lens barrel.
- some lens groups constituting the zoom lens system such as the entire second lens group G2, the entire third lens group G3, and a part of the second lens group G2, are irradiated with light when retracted.
- the zoom lens system may be applied to a so-called sliding lens barrel that is retracted from the axis.
- An imaging apparatus including the zoom lens system according to Embodiments 1 to 10 described above and an imaging device such as a CCD or a CMOS is used as a mobile phone device, a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, a Web
- an imaging device such as a CCD or a CMOS
- PDA Personal Digital Assistance
- a surveillance camera in a surveillance system a surveillance system
- Web a Web
- the present invention can also be applied to cameras, in-vehicle cameras, and the like.
- the unit of length in the table is “mm”, and the unit of angle of view is “°”.
- r is a radius of curvature
- d is a surface interval
- nd is a refractive index with respect to the d line
- vd is an Abbe number with respect to the d line.
- the surface marked with * is an aspherical surface
- the aspherical shape is defined by the following equation.
- ⁇ is a conic constant
- A4, A6, A8, A10, A12, A14, and A16 are fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order, and sixteenth-order aspheric coefficients, respectively.
- each longitudinal aberration diagram shows the aberration at the wide angle end, (b) shows the intermediate position, and (c) shows the aberration at the telephoto end.
- SA spherical aberration
- AST mm
- DIS distortion
- the vertical axis represents the F number (indicated by F in the figure)
- the solid line is the d line (d-line)
- the short broken line is the F line (F-line)
- the long broken line is the C line (C- line).
- the vertical axis represents the image height (indicated by H in the figure), the solid line represents the sagittal plane (indicated by s), and the broken line represents the meridional plane (indicated by m in the figure). is there.
- the vertical axis represents the image height (indicated by H in the figure).
- 3, 6, 9, 12, 15, 18, 21, 24, 27 and 30 are lateral aberration diagrams at the telephoto end of the zoom lens systems according to Embodiments 1 to 10, respectively.
- the upper three aberration diagrams show a basic state in which image blur correction is not performed at the telephoto end, and the lower three aberration diagrams move the entire second lens group G2 by a predetermined amount in a direction perpendicular to the optical axis. This 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 lateral aberration at the image point of -70% of the maximum image height.
- the upper stage is the lateral aberration at the image point of 70% of the maximum image height
- the middle stage is the lateral aberration at the axial image point
- the lower stage is at the image point of -70% of the maximum image height.
- the horizontal axis represents the distance from the principal ray on the pupil plane
- the solid line is the d line (d-line)
- the short broken line is the F line (F-line)
- the long broken line is the C line ( C-line) characteristics.
- the meridional plane is a plane including the optical axis of the first lens group G1 and the optical axis of the second lens group G2.
- the movement amount (Y T ) in the direction perpendicular to the optical axis of the second lens group G2 in the image blur correction state at the telephoto end is as shown in the following table. is there. Numerical Example Movement Amount Y T (mm) 1 0.081 2 0.079 3 0.082 4 0.081 5 0.069 6 0.081 7 0.082 8 0.070 9 0.081 10 0.082
- the entire amount of the second lens group G2 translates in the direction perpendicular to the optical axis by the above values. It is equal to the amount of eccentricity of the image.
- Table 31 below shows corresponding values of the respective conditions in the zoom lens systems of Numerical Examples 1 to 10.
- the zoom lens system according to the present invention is applicable to digital input devices such as a digital camera, a mobile phone device, a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, a Web camera, an in-vehicle camera, etc. It is suitable for a photographing optical system that requires high image quality.
- digital input devices such as a digital camera, a mobile phone device, a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, a Web camera, an in-vehicle camera, etc. It is suitable for a photographing optical system that requires high image quality.
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Abstract
Description
少なくとも1枚のレンズ素子で構成されたレンズ群を複数有するズームレンズ系であって、
物体側から像側へと順に、
負のパワーを有し、少なくとも2枚のレンズ素子からなる第1レンズ群と、
正のパワーを有する第2レンズ群とを備え、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群と第2レンズ群との間隔が減少するように各レンズ群を光軸に沿ってそれぞれ移動させて変倍を行い、
以下の条件(1)及び(a):
fW/D1>7.5 ・・・(1)
Z=fT/fW>4.0 ・・・(a)
(ここで、
fW:広角端における全系の焦点距離、
fT:望遠端における全系の焦点距離、
D1:第1レンズ群の最物体側に位置するレンズ素子の中心厚み
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、
少なくとも1枚のレンズ素子で構成されたレンズ群を複数有し、
物体側から像側へと順に、
負のパワーを有し、少なくとも2枚のレンズ素子からなる第1レンズ群と、
正のパワーを有する第2レンズ群とを備え、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群と第2レンズ群との間隔が減少するように各レンズ群を光軸に沿ってそれぞれ移動させて変倍を行い、
以下の条件(1)及び(a):
fW/D1>7.5 ・・・(1)
Z=fT/fW>4.0 ・・・(a)
(ここで、
fW:広角端における全系の焦点距離、
fT:望遠端における全系の焦点距離、
D1:第1レンズ群の最物体側に位置するレンズ素子の中心厚み
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、
少なくとも1枚のレンズ素子で構成されたレンズ群を複数有し、
物体側から像側へと順に、
負のパワーを有し、少なくとも2枚のレンズ素子からなる第1レンズ群と、
正のパワーを有する第2レンズ群とを備え、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群と第2レンズ群との間隔が減少するように各レンズ群を光軸に沿ってそれぞれ移動させて変倍を行い、
以下の条件(1)及び(a):
fW/D1>7.5 ・・・(1)
Z=fT/fW>4.0 ・・・(a)
(ここで、
fW:広角端における全系の焦点距離、
fT:望遠端における全系の焦点距離、
D1:第1レンズ群の最物体側に位置するレンズ素子の中心厚み
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。
図1、4、7、10、13、16、19、22、25及び28は、各々実施の形態1~10に係るズームレンズ系のレンズ配置図であり、いずれも無限遠合焦状態にあるズームレンズ系を表している。
Z=fT/fW>4.0 ・・・(a)
ここで、
fT:望遠端における全系の焦点距離、
fW:広角端における全系の焦点距離
である。
ωW>37 ・・・(b)
ここで、
ωW:広角端における最大画角の半値(°)
である。
fW/D1>7.5 ・・・(1)
ここで、
fW:広角端における全系の焦点距離、
D1:第1レンズ群の最物体側に位置するレンズ素子の中心厚み
である。
fW/D1>14.0 ・・・(1)’
fT/D1>30.0 ・・・(2)
ここで、
fT:望遠端における全系の焦点距離、
D1:第1レンズ群の最物体側に位置するレンズ素子の中心厚み
である。
fT/D1>60.0 ・・・(2)’
0.50<DG1/Ir<1.06 ・・・(3)
ここで、
DG1:第1レンズ群の中心厚み、
Ir:次式で表される値
Ir=fT×tan(ωT)、
fT:望遠端における全系の焦点距離、
ωT:望遠端における最大画角の半値(°)
である。
0.65<DG1/Ir ・・・(3)’
DG1/Ir<1.00 ・・・(3)’’
0.60<(DG1+DG3)/Ir<1.40 ・・・(4)
ここで、
DG1:第1レンズ群の中心厚み、
DG3:第3レンズ群の中心厚み、
Ir:次式で表される値
Ir=fT×tan(ωT)、
fT:望遠端における全系の焦点距離、
ωT:望遠端における最大画角の半値(°)
である。
0.75<(DG1+DG3)/Ir ・・・(4)’
(DG1+DG3)/Ir<1.20 ・・・(4)’’
0.01<D1/D12<0.40 ・・・(5)
ここで、
D1:第1レンズ群の最物体側に位置するレンズ素子の中心厚み、
D12:第1レンズ群の最物体側に位置するレンズ素子と該最物体側に位置するレンズ素子と隣り合うレンズ素子との空気間隔
である。
D1/D12<0.20 ・・・(5)’
1.2<((2×D2×R2F×R2R)/(R2R-R2F))0.5/Ir<2.0
・・・(6)
ここで、
D2:第1レンズ群の最物体側に位置するレンズ素子と隣り合うレンズ素子の中心厚み、
R2F:第1レンズ群の最物体側に位置するレンズ素子と隣り合うレンズ素子の物体側面の曲率半径、
R2R:第1レンズ群の最物体側に位置するレンズ素子と隣り合うレンズ素子の像側面の曲率半径、
Ir:次式で表される値
Ir=fT×tan(ωT)、
fT:望遠端における全系の焦点距離、
ωT:望遠端における最大画角の半値(°)
である。
1.4<((2×D2×R2F×R2R)/(R2R-R2F))0.5/Ir
・・・(6)’
((2×D2×R2F×R2R)/(R2R-R2F))0.5/Ir<1.9
・・・(6)’’
1.03<Nd2/Nd1<2.00 ・・・(7)
ここで、
Nd1:接合レンズ素子の、最物体側に位置するレンズ素子のd線に対する屈折率、
Nd2:接合レンズ素子の、最物体側に位置するレンズ素子と接合しているレンズ素子のd線に対する屈折率
である。
1.15<Nd2/Nd1 ・・・(7)’
Nd2/Nd1<1.50 ・・・(7)’’
0.5<((2×D7×R7F×R7R)/(R7R-R7F))0.5/Ir<1.5
・・・(8)
ここで、
D7:第3レンズ群のレンズ素子の中心厚み、
R7F:第3レンズ群のレンズ素子の物体側面の曲率半径、
R7R:第3レンズ群のレンズ素子の像側面の曲率半径、
Ir:次式で表される値
Ir=fT×tan(ωT)、
fT:望遠端における全系の焦点距離、
ωT:望遠端における最大画角の半値(°)
である。
YT>Y ・・・(9)
1.5<(Y/YT)/(f/fT)<3.0 ・・・(10)
ここで、
f:全系の焦点距離、
fT:望遠端における全系の焦点距離、
Y:全系の焦点距離fにおける、第2レンズ群の、最大ぶれ補正時の光軸に対して垂直方向への移動量、
YT:望遠端での全系の焦点距離fTにおける、第2レンズ群の、最大ぶれ補正時の光軸に対して垂直方向への移動量
である。
2.0<(Y/YT)/(f/fT) ・・・(10)’
(Y/YT)/(f/fT)<2.6 ・・・(10)’’
図31は、実施の形態11に係るデジタルスチルカメラの概略構成図である。図31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31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。
数値実施例 移動量Y T (mm)
1 0.081
2 0.079
3 0.082
4 0.081
5 0.069
6 0.081
7 0.082
8 0.070
9 0.081
10 0.082
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* 376.90300 0.10000 1.77200 50.0
2* 5.00600 2.02000
3 8.81800 1.17100 1.99537 20.7
4 14.80000 可変
5* 4.76400 1.22300 1.80434 40.8
6 20.42500 0.15000
7 6.32100 0.97600 1.72000 50.3
8 83.09200 0.01000 1.56732 42.8
9 83.09200 0.30000 1.84666 23.8
10 3.46000 0.79800
11 25.79800 0.55800 1.83400 37.3
12 -25.42400 0.44800
13(絞り) ∞ 可変
14* 30.81700 1.38300 1.51835 70.3
15* -14.49800 可変
16 ∞ 0.78000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4=-2.07504E-04, A6= 1.79274E-05, A8=-3.76493E-07
A10=-1.87220E-09, A12= 1.70356E-10, A14=-1.74409E-12, A16= 0.00000E+00
第2面
K=-3.88161E+00, A4= 3.04951E-03, A6=-1.57450E-04, A8= 1.09635E-05
A10=-4.51143E-07, A12= 8.77171E-09, A14=-2.02447E-11, A16=-1.21955E-12
第5面
K= 0.00000E+00, A4=-5.29795E-04, A6=-1.86252E-05, A8=-1.72108E-06
A10= 2.29543E-07, A12= 4.49667E-10, A14=-1.70054E-09, A16= 0.00000E+00
第14面
K= 0.00000E+00, A4= 6.43797E-04, A6=-1.59684E-04, A8= 1.78702E-05
A10=-1.01388E-06, A12= 2.02058E-08, A14= 0.00000E+00, A16= 0.00000E+00
第15面
K= 0.00000E+00, A4= 1.00911E-03, A6=-1.81490E-04, A8= 1.93687E-05
A10=-1.05735E-06, A12= 2.05281E-08, A14= 0.00000E+00, A16= 0.00000E+00
ズーム比 4.74080
広角 中間 望遠
焦点距離 4.5524 10.2934 21.5820
Fナンバー 2.89303 4.73146 6.08515
画角 41.9012 20.9296 10.0952
像高 3.6000 3.9000 3.9000
レンズ全長 30.6963 28.5343 37.4510
BF 0.81535 0.79133 0.74456
d4 13.1497 4.0849 0.3000
d13 3.3156 10.5660 23.8497
d15 3.4987 3.1751 2.6397
入射瞳位置 6.6848 5.3769 4.4876
射出瞳位置 -9.2658 -30.7761 86.0868
前側主点位置 9.1815 12.3139 31.5273
後側主点位置 26.1440 18.2410 15.8690
単レンズデータ
レンズ 始面 焦点距離
1 1 -6.5725
2 3 19.9681
3 5 7.4647
4 7 9.4517
5 9 -4.2716
6 11 15.4299
7 14 19.2213
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -10.78884 3.29100 -0.60798 -0.05266
2 5 9.53628 4.46300 -1.16896 0.36648
3 14 19.22127 1.38300 0.62596 1.08851
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.57527 -1.26944 -2.55852
3 14 0.73348 0.75157 0.78186
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* 47.67570 0.30000 1.80470 41.0
2* 4.40240 2.02000
3 9.11440 1.31380 1.99537 20.7
4 17.58820 可変
5* 5.36520 1.10000 1.80470 41.0
6 16.76820 0.15000
7 5.53700 1.72350 1.48749 70.4
8 17.48420 0.01000 1.56732 42.8
9 17.48420 0.30000 1.84666 23.8
10 3.69180 0.56190
11 10.36260 0.87940 1.71300 53.9
12 -33.39860 0.44800
13(絞り) ∞ 可変
14* 12.25540 1.38300 1.51835 70.3
15* -100.15000 可変
16 ∞ 0.78000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4=-4.31892E-04, A6= 1.71184E-05, A8=-6.11570E-07
A10= 1.14513E-08, A12=-6.58467E-11, A14=-3.45648E-13, A16= 0.00000E+00
第2面
K=-1.92659E+00, A4= 1.29147E-03, A6=-3.49146E-05, A8= 2.61576E-06
A10=-1.55494E-07, A12= 3.49670E-09, A14= 2.18826E-11, A16=-1.30739E-12
第5面
K= 0.00000E+00, A4=-3.40457E-04, A6=-1.00479E-05, A8=-9.67088E-07
A10= 5.25306E-07, A12=-9.45088E-08, A14= 5.18417E-09, A16= 0.00000E+00
第14面
K= 0.00000E+00, A4=-1.25406E-03, A6= 1.88903E-04, A8=-1.84993E-05
A10= 9.05200E-07, A12=-1.95790E-08, A14= 0.00000E+00, A16= 0.00000E+00
第15面
K= 0.00000E+00, A4=-1.25200E-03, A6= 1.91105E-04, A8=-1.78367E-05
A10= 8.17466E-07, A12=-1.67813E-08, A14= 0.00000E+00, A16= 0.00000E+00
ズーム比 4.67013
広角 中間 望遠
焦点距離 4.5699 9.8757 21.3419
Fナンバー 2.90114 4.54392 6.12766
画角 41.4426 21.8652 10.2088
像高 3.6000 3.9000 3.9000
レンズ全長 32.0163 28.7643 38.1935
BF 0.50460 0.51133 0.45327
d4 13.5088 4.0658 0.3000
d13 4.2411 9.6159 23.8116
d15 2.7922 3.6017 2.6590
入射瞳位置 6.7067 5.5673 4.8381
射出瞳位置 -9.5829 -22.8988 179.4711
前側主点位置 9.2063 11.2768 28.7243
後側主点位置 27.4464 18.8886 16.8515
単レンズデータ
レンズ 始面 焦点距離
1 1 -6.0461
2 3 17.6414
3 5 9.4000
4 7 15.8718
5 9 -5.5832
6 11 11.1858
7 14 21.1542
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -10.40646 3.63380 -0.61009 0.04913
2 5 9.47561 5.17280 -1.16523 0.63304
3 14 21.15418 1.38300 0.09973 0.56803
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.56205 -1.27771 -2.59585
3 14 0.78132 0.74273 0.79004
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* 85.83000 0.50000 1.80470 41.0
2* 4.65000 1.94300
3 8.92900 1.50400 2.01960 21.5
4 16.94100 可変
5* 5.70000 1.19600 1.80359 40.8
6 27.40300 0.15000
7 5.35800 1.53300 1.49700 81.6
8 23.32100 0.01000 1.56732 42.8
9 23.32100 0.30000 1.84666 23.8
10 3.77400 0.63500
11 23.14600 0.70000 1.83481 42.7
12 -23.14600 0.44800
13(絞り) ∞ 可変
14* 16.73500 1.36200 1.51845 70.0
15* -35.04600 可変
16 ∞ 0.78000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4= 1.67521E-05, A6=-6.32273E-06, A8= 1.49631E-07
A10=-1.17542E-09, A12= 0.00000E+00, A14= 0.00000E+00, A16= 0.00000E+00
第2面
K=-6.56425E-01, A4= 1.31278E-06, A6=-1.52009E-05, A8= 1.18927E-06
A10=-1.16818E-07, A12= 5.23273E-09, A14=-1.01819E-10, A16= 6.36437E-13
第5面
K= 0.00000E+00, A4=-2.75821E-04, A6=-3.29535E-05, A8= 8.16234E-06
A10=-1.41592E-06, A12= 1.12370E-07, A14=-3.21408E-09, A16= 0.00000E+00
第14面
K= 0.00000E+00, A4=-1.38176E-05, A6=-6.21437E-05, A8= 9.32874E-06
A10=-5.46078E-07, A12= 9.60122E-09, A14= 0.00000E+00, A16= 0.00000E+00
第15面
K= 0.00000E+00, A4= 2.21664E-04, A6=-1.07372E-04, A8= 1.35168E-05
A10=-7.28810E-07, A12= 1.26395E-08, A14= 0.00000E+00, A16= 0.00000E+00
ズーム比 4.74713
広角 中間 望遠
焦点距離 4.6614 10.1581 22.1283
Fナンバー 2.90559 4.46621 6.13215
画角 41.0122 21.3353 9.9552
像高 3.6000 3.9000 3.9000
レンズ全長 33.7031 29.3487 39.0352
BF 0.72648 0.73604 0.67837
d4 14.7264 4.2856 0.3000
d13 4.9288 9.6091 24.0017
d15 2.2604 3.6570 2.9941
入射瞳位置 7.1024 5.7895 4.9539
射出瞳位置 -10.2290 -22.7593 233.9598
前側主点位置 9.7804 11.5558 29.1812
後側主点位置 29.0417 19.1906 16.9069
単レンズデータ
レンズ 始面 焦点距離
1 1 -6.1264
2 3 16.9141
3 5 8.7415
4 7 13.6108
5 9 -5.3558
6 11 13.9591
7 14 22.0447
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -10.77296 3.94700 -0.45083 0.45305
2 5 9.62416 4.97200 -1.27736 0.50691
3 14 22.04473 1.36200 0.29252 0.74942
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.53196 -1.25790 -2.62569
3 14 0.81339 0.74961 0.78229
数値実施例4のズームレンズ系は、図10に示した実施の形態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に、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* 64.98300 0.30000 1.80470 41.0
2* 4.86000 2.12200
3 9.18800 1.45400 2.00272 19.3
4 15.84200 可変
5* 5.80600 1.19000 1.80436 40.9
6 28.10800 0.15000
7 5.41900 1.49100 1.49700 81.6
8 23.25400 0.01000 1.56732 42.8
9 23.25400 0.30000 1.84666 23.8
10 3.87700 0.63500
11 23.30600 0.71000 1.83481 42.7
12 -23.30600 0.42300
13(絞り) ∞ 可変
14* 20.07100 1.44300 1.52996 55.8
15* -38.10900 可変
16 ∞ 0.78000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4=-9.66470E-05, A6=-1.47019E-06, A8= 1.64608E-07
A10=-3.66265E-09, A12= 1.71491E-11, A14= 3.69371E-13, A16=-4.12022E-15
第2面
K=-7.43416E-01, A4= 3.61467E-05, A6=-1.18123E-05, A8= 1.59746E-06
A10=-1.19135E-07, A12= 5.16044E-09, A14=-1.12667E-10, A16= 9.02143E-13
第5面
K= 0.00000E+00, A4=-2.74010E-04, A6=-3.07773E-05, A8= 1.13844E-05
A10=-2.72034E-06, A12= 3.09310E-07, A14=-1.35981E-08, A16= 0.00000E+00
第14面
K= 0.00000E+00, A4=-3.97245E-04, A6=-1.62382E-05, A8= 6.14516E-06
A10=-4.16218E-07, A12= 1.39981E-09, A14= 4.13302E-10, A16=-6.82361E-12
第15面
K= 0.00000E+00, A4=-2.29091E-04, A6=-4.29717E-05, A8= 9.36646E-06
A10=-5.93566E-07, A12= 5.24991E-09, A14= 4.02615E-10, A16=-7.10074E-12
ズーム比 4.75073
広角 中間 望遠
焦点距離 4.6355 10.1748 22.0218
Fナンバー 2.89659 4.46169 6.12235
画角 41.2910 21.2335 9.9497
像高 3.6140 3.9020 3.9020
レンズ全長 34.0115 29.4047 38.3928
BF 0.83152 0.83371 0.68876
d4 15.0540 4.4380 0.3000
d13 4.7360 9.5210 23.4180
d15 2.3820 3.6040 2.9780
入射瞳位置 7.0890 5.7474 4.8637
射出瞳位置 -9.8686 -20.9839 -469.7425
前側主点位置 9.7163 11.1771 25.8547
後側主点位置 29.3761 19.2299 16.3709
単レンズデータ
レンズ 始面 焦点距離
1 1 -6.5423
2 3 19.6643
3 5 8.8859
4 7 13.8325
5 9 -5.5346
6 11 14.0563
7 14 25.0223
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -10.79533 3.87600 -0.48140 0.32976
2 5 9.65689 4.90900 -1.15966 0.56358
3 14 25.02229 1.44300 0.32819 0.81986
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.51977 -1.21272 -2.52466
3 14 0.82612 0.77719 0.80801
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* 43.59900 0.30000 1.88300 40.8
2* 4.57200 1.87000
3 7.15000 1.60000 1.92287 18.9
4 11.32800 可変
5* 4.23600 2.00000 1.77250 49.6
6 9.39400 0.50000 1.64769 33.8
7 3.67100 0.48000
8 8.25100 0.50000 1.76183 26.5
9 4.05300 2.00000 1.60311 60.6
10 -11.60700 0.30000
11(絞り) ∞ 可変
12 48.09900 1.60000 1.60311 60.6
13 -28.05300 可変
14 ∞ 1.40000 1.51633 64.1
15 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4= 2.17331E-04, A6=-5.74760E-06, A8= 5.32242E-08
A10= 7.72352E-10, A12= 2.59391E-11, A14= 3.03642E-13, A16=-1.87017E-14
第2面
K=-1.47346E+00, A4= 1.50049E-03, A6= 1.66066E-06, A8= 1.22327E-07
A10=-1.49908E-09, A12=-1.13887E-10, A14= 6.97810E-12, A16= 1.72221E-12
第5面
K=-3.90818E-01, A4=-1.15574E-04, A6=-1.47326E-07, A8=-5.30480E-07
A10= 6.29464E-08, A12= 0.00000E+00, A14= 0.00000E+00, A16= 0.00000E+00
ズーム比 4.79875
広角 中間 望遠
焦点距離 4.2668 10.4194 20.4753
Fナンバー 2.99449 5.07586 6.29349
画角 41.0556 19.5893 10.0393
像高 3.3000 3.6000 3.6000
レンズ全長 31.1062 29.2955 38.5732
BF 1.02162 1.02626 1.01656
d4 11.8326 2.5052 0.1500
d11 1.7085 7.7422 23.0251
d13 3.9935 5.4718 1.8315
入射瞳位置 6.3039 5.1695 4.7118
射出瞳位置 -7.8328 -18.4483 -120.8323
前側主点位置 8.5146 10.0142 21.7465
後側主点位置 26.8394 18.8761 18.0979
単レンズデータ
レンズ 始面 焦点距離
1 1 -5.8053
2 3 17.7449
3 5 8.5431
4 6 -9.6343
5 8 -11.0242
6 9 5.2323
7 12 29.6131
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -9.12343 3.77000 -0.15473 0.84525
2 5 8.99051 5.78000 0.23803 1.80748
3 12 29.61311 1.60000 0.63542 1.22940
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.59428 -1.54985 -2.60919
3 12 0.78695 0.73688 0.86013
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* 388.35400 0.30000 1.77200 50.0
2* 5.00700 2.02000
3 8.81800 1.17100 1.99537 20.7
4 14.80000 可変
5* 4.76400 1.22300 1.80434 40.8
6 20.42500 0.15000
7 6.32100 0.97600 1.72000 50.3
8 83.09200 0.01000 1.56732 42.8
9 83.09200 0.30000 1.84666 23.8
10 3.46000 0.79800
11 25.79800 0.55800 1.83400 37.3
12 -25.42400 0.44800
13(絞り) ∞ 可変
14* 30.81700 1.38300 1.51835 70.3
15* -14.49800 可変
16 ∞ 0.78000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4=-1.70236E-04, A6= 1.57345E-05, A8=-3.38808E-07
A10=-1.66954E-09, A12= 1.55183E-10, A14=-1.58235E-12, A16= 0.00000E+00
第2面
K=-3.90260E+00, A4= 3.09719E-03, A6=-1.58540E-04, A8= 1.10039E-05
A10=-4.56689E-07, A12= 8.76183E-09, A14=-1.02722E-11, A16=-1.39663E-12
第5面
K= 0.00000E+00, A4=-5.29795E-04, A6=-1.86252E-05, A8=-1.72108E-06
A10= 2.29543E-07, A12= 4.49667E-10, A14=-1.70054E-09, A16= 0.00000E+00
第14面
K= 0.00000E+00, A4= 6.43797E-04, A6=-1.59684E-04, A8= 1.78702E-05
A10=-1.01388E-06, A12= 2.02058E-08, A14= 0.00000E+00, A16= 0.00000E+00
第15面
K= 0.00000E+00, A4= 1.00911E-03, A6=-1.81490E-04, A8= 1.93687E-05
A10=-1.05735E-06, A12= 2.05281E-08, A14= 0.00000E+00, A16= 0.00000E+00
ズーム比 4.74006
広角 中間 望遠
焦点距離 4.5528 10.2951 21.5805
Fナンバー 2.89308 4.73186 6.08560
画角 41.8796 20.9264 10.0954
像高 3.6000 3.9000 3.9000
レンズ全長 30.8970 28.7374 37.6645
BF 0.81535 0.79222 0.74193
d4 13.1497 4.0849 0.3000
d13 3.3156 10.5660 23.8497
d15 3.4993 3.1773 2.6559
入射瞳位置 6.7994 5.4914 4.6019
射出瞳位置 -9.2664 -30.7783 86.0706
前側主点位置 9.2962 12.4292 31.6403
後側主点位置 26.3442 18.4424 16.0840
単レンズデータ
レンズ 始面 焦点距離
1 1 -6.5727
2 3 19.9681
3 5 7.4647
4 7 9.4517
5 9 -4.2716
6 11 15.4299
7 14 19.2213
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -10.78804 3.49100 -0.49277 0.14993
2 5 9.53628 4.46300 -1.16896 0.36648
3 14 19.22127 1.38300 0.62596 1.08851
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.57539 -1.27002 -2.56085
3 14 0.73345 0.75141 0.78115
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* 577.05700 0.10000 1.77200 50.0
2* 5.17500 2.02000
3 8.86400 0.78700 1.99537 20.7
4 14.43100 可変
5* 4.71800 1.22300 1.80434 40.8
6 21.37800 0.15000
7 6.21100 0.97600 1.72000 50.3
8 48.76700 0.01000 1.56732 42.8
9 48.76700 0.30000 1.84666 23.8
10 3.37500 0.79800
11 24.64300 0.55800 1.83400 37.3
12 -29.28600 0.44800
13(絞り) ∞ 可変
14* 25.29100 1.01400 1.51835 70.3
15* -14.93700 可変
16 ∞ 0.78000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4=-1.41328E-04, A6= 1.77078E-05, A8=-3.80834E-07
A10=-1.96260E-09, A12= 1.69558E-10, A14=-1.70289E-12, A16= 0.00000E+00
第2面
K=-4.07113E+00, A4= 3.01642E-03, A6=-1.53223E-04, A8= 1.09812E-05
A10=-4.52714E-07, A12= 8.75368E-09, A14=-1.94024E-11, A16=-1.24676E-12
第5面
K= 0.00000E+00, A4=-5.25358E-04, A6=-2.41420E-05, A8=-1.41858E-06
A10= 2.33286E-07, A12=-2.78033E-09, A14=-1.46078E-09, A16= 0.00000E+00
第14面
K= 0.00000E+00, A4= 6.43797E-04, A6=-1.59684E-04, A8= 1.78702E-05
A10=-1.01388E-06, A12= 2.02058E-08, A14= 0.00000E+00, A16= 0.00000E+00
第15面
K= 0.00000E+00, A4= 1.00911E-03, A6=-1.81490E-04, A8= 1.93687E-05
A10=-1.05735E-06, A12= 2.05281E-08, A14= 0.00000E+00, A16= 0.00000E+00
ズーム比 4.77449
広角 中間 望遠
焦点距離 4.5209 10.2608 21.5850
Fナンバー 2.21864 3.44045 5.85342
画角 42.0205 20.9626 10.0596
像高 3.6000 3.9000 3.9000
レンズ全長 29.9517 27.7940 36.7648
BF 0.82306 0.80178 0.79515
d4 13.1497 4.0849 0.3000
d13 3.3156 10.5660 23.8497
d15 3.4993 3.1773 2.6559
入射瞳位置 6.5390 5.0830 4.0701
射出瞳位置 -9.6953 -34.5145 66.6482
前側主点位置 9.1168 12.3627 32.7302
後側主点位置 25.4307 17.5331 15.1797
単レンズデータ
レンズ 始面 焦点距離
1 1 -6.7645
2 3 21.5638
3 5 7.2883
4 7 9.7914
5 9 -4.2956
6 11 16.1218
7 14 18.2739
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -10.91313 2.90700 -0.66820 -0.35967
2 5 9.49701 4.01500 -1.28883 0.30208
3 14 18.27390 1.01400 0.42350 0.76388
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.57406 -1.26985 -2.57097
3 14 0.72164 0.74043 0.76932
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* 43.35000 0.10000 1.88300 40.8
2* 4.63400 1.80100
3 7.02800 0.89200 1.92287 18.9
4 11.21300 可変
5* 4.23300 2.00000 1.77250 49.6
6 9.10100 0.50000 1.64769 33.8
7 3.65000 0.48000
8 8.19600 0.50000 1.76183 26.5
9 4.03100 2.00000 1.60311 60.6
10 -11.56500 0.30000
11(絞り) ∞ 可変
12 35.71000 0.53500 1.60311 60.6
13 -38.28900 可変
14 ∞ 1.40000 1.51633 64.1
15 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4= 2.22751E-04, A6=-5.57619E-06, A8= 5.24555E-08
A10= 7.84525E-10, A12= 2.86538E-11, A14= 3.52576E-13, A16=-2.47398E-14
第2面
K=-1.47289E+00, A4= 1.49495E-03, A6= 1.63460E-06, A8= 2.30658E-07
A10= 3.22245E-09, A12= 1.59094E-11, A14= 4.57897E-12, A16= 9.80534E-13
第5面
K=-3.91335E-01, A4=-1.31856E-04, A6= 1.04723E-05, A8=-2.19704E-07
A10=-1.31946E-07, A12= 0.00000E+00, A14= 0.00000E+00, A16= 0.00000E+00
ズーム比 4.79761
広角 中間 望遠
焦点距離 4.2700 10.4414 20.4858
Fナンバー 2.44803 3.71028 6.20650
画角 41.6796 19.6031 10.0133
像高 3.3000 3.6000 3.6000
レンズ全長 30.1328 27.6130 36.1785
BF 1.03360 1.04041 1.02915
d4 12.3267 2.5746 0.1500
d11 2.0724 7.8501 23.0014
d13 4.1921 5.6399 1.4900
入射瞳位置 6.0761 4.7652 4.2292
射出瞳位置 -8.0502 -18.1308 -101.9046
前側主点位置 8.3389 9.5198 20.6380
後側主点位置 25.8628 17.1716 15.6927
単レンズデータ
レンズ 始面 焦点距離
1 1 -5.8833
2 3 18.5105
3 5 8.6887
4 6 -9.7608
5 8 -10.9823
6 9 5.2074
7 12 30.7202
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -9.43753 2.79300 -0.49513 -0.07971
2 5 9.02732 5.48000 0.23639 1.80412
3 12 30.72022 0.53500 0.16149 0.36185
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.56969 -1.48137 -2.46023
3 12 0.79420 0.74685 0.88231
数値実施例9のズームレンズ系は、図25に示した実施の形態9に対応する。数値実施例9のズームレンズ系の面データを表25に、非球面データを表26に、各種データを表27に示す。
面番号 r d nd vd
物面 ∞
1* 1695.36900 0.10000 1.77200 50.0
2* 5.00000 2.02000
3 8.67000 0.78700 1.99537 20.7
4 14.48800 可変
5* 4.69200 1.22300 1.80434 40.8
6 19.35900 0.15000
7 6.13300 0.97600 1.72000 50.3
8 61.32000 0.01000 1.56732 42.8
9 61.32000 0.30000 1.84666 23.8
10 3.36800 0.79800
11 24.07500 0.55800 1.83400 37.3
12 -26.22100 0.48800
13(絞り) ∞ 可変
14* 42.12100 1.01400 1.51835 70.3
15* -14.33000 可変
16 25.04600 0.50000 1.51680 64.2
17 43.18400 0.40000
18 ∞ 0.28000 1.51680 64.2
19 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4=-1.78655E-04, A6= 1.78850E-05, A8=-3.97728E-07
A10=-1.54273E-09, A12= 1.76094E-10, A14=-1.87170E-12, A16= 0.00000E+00
第2面
K=-3.79730E+00, A4= 3.03280E-03, A6=-1.51755E-04, A8= 1.07402E-05
A10=-4.51070E-07, A12= 8.93059E-09, A14=-1.72068E-11, A16=-1.39873E-12
第5面
K= 0.00000E+00, A4=-5.25998E-04, A6=-2.96663E-05, A8= 4.21460E-07
A10= 1.28255E-07, A12=-2.65635E-08, A14= 8.48687E-10, A16= 0.00000E+00
第14面
K= 0.00000E+00, A4= 6.43797E-04, A6=-1.59684E-04, A8= 1.78702E-05
A10=-1.01388E-06, A12= 2.02058E-08, A14= 0.00000E+00, A16= 0.00000E+00
第15面
K= 0.00000E+00, A4= 1.00911E-03, A6=-1.81490E-04, A8= 1.93687E-05
A10=-1.05735E-06, A12= 2.05281E-08, A14= 0.00000E+00, A16= 0.00000E+00
ズーム比 4.72709
広角 中間 望遠
焦点距離 4.5498 10.2364 21.5074
Fナンバー 2.26419 3.48945 5.90718
画角 41.9033 20.9704 10.0886
像高 3.6000 3.9000 3.9000
レンズ全長 30.1928 27.9553 36.7971
BF 0.40673 0.38827 0.34716
d4 13.1360 4.1603 0.3000
d13 3.5311 10.6830 23.7691
d15 3.5550 3.1597 2.8168
入射瞳位置 6.3953 4.9993 3.9956
射出瞳位置 -11.1178 -40.8409 58.7768
前側主点位置 9.1489 12.6942 33.4197
後側主点位置 25.6430 17.7188 15.2897
単レンズデータ
レンズ 始面 焦点距離
1 1 -6.4960
2 3 20.3194
3 5 7.4235
4 7 9.3951
5 9 -4.2192
6 11 15.1256
7 14 20.7549
8 16 114.3117
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -10.68426 2.90700 -0.71594 -0.42959
2 5 9.44926 4.01500 -1.19933 0.34857
3 14 20.75494 1.01400 0.50138 0.84343
4 16 114.31172 1.18000 -0.45095 -0.18213
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.57240 -1.25445 -2.57314
3 14 0.75566 0.77562 0.79419
4 16 0.98453 0.98469 0.98505
数値実施例10のズームレンズ系は、図28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28に、非球面データを表29に、各種データを表30示す。
面番号 r d nd vd
物面 ∞
1* 77.76600 0.30000 1.80470 41.0
2* 4.62600 1.94300
3 8.92900 1.50400 2.01960 21.5
4 16.94100 可変
5* 5.70000 1.19600 1.80359 40.8
6 27.40300 0.15000
7 5.35800 1.53300 1.49700 81.6
8 23.32100 0.01000 1.56732 42.8
9 23.32100 0.30000 1.84666 23.8
10 3.77400 0.63500
11 23.14600 0.70000 1.83481 42.7
12 -23.14600 0.44800
13(絞り) ∞ 可変
14* 16.73500 1.36200 1.51845 70.0
15* -35.04600 可変
16 ∞ 0.78000 1.51680 64.2
17 ∞ (BF)
像面 ∞
第1面
K= 0.00000E+00, A4=-4.96052E-05, A6=-5.44364E-06, A8= 1.84959E-07
A10=-1.85294E-09, A12= 0.00000E+00, A14= 0.00000E+00, A16= 0.00000E+00
第2面
K=-7.01947E-01, A4=-6.24141E-06, A6=-1.63099E-05, A8= 1.31846E-06
A10=-1.11371E-07, A12= 5.01378E-09, A14=-9.87969E-11, A16= 5.64359E-13
第5面
K= 0.00000E+00, A4=-2.75821E-04, A6=-3.29535E-05, A8= 8.16234E-06
A10=-1.41592E-06, A12= 1.12370E-07, A14=-3.21408E-09, A16= 0.00000E+00
第14面
K= 0.00000E+00, A4=-1.38176E-05, A6=-6.21437E-05, A8= 9.32874E-06
A10=-5.46078E-07, A12= 9.60122E-09, A14= 0.00000E+00, A16= 0.00000E+00
第15面
K= 0.00000E+00, A4= 2.21664E-04, A6=-1.07372E-04, A8= 1.35168E-05
A10=-7.28810E-07, A12= 1.26395E-08, A14= 0.00000E+00, A16= 0.00000E+00
ズーム比 4.74774
広角 中間 望遠
焦点距離 4.6588 10.1500 22.1189
Fナンバー 2.90561 4.46552 6.13304
画角 41.0090 21.3536 9.9582
像高 3.6000 3.9000 3.9000
レンズ全長 33.5016 29.1418 38.8021
BF 0.72591 0.73278 0.65613
d4 14.7264 4.2856 0.3000
d13 4.9288 9.6091 24.0017
d15 2.2595 3.6533 2.9833
入射瞳位置 6.9823 5.6706 4.8359
射出瞳位置 -10.2281 -22.7556 233.9706
前側主点位置 9.6597 11.4345 29.0518
後側主点位置 28.8428 18.9918 16.6832
単レンズデータ
レンズ 始面 焦点距離
1 1 -6.1235
2 3 16.9141
3 5 8.7415
4 7 13.6108
5 9 -5.3558
6 11 13.9591
7 14 22.0447
ズームレンズ群データ
群 始面 焦点距離 レンズ構成長 前側主点位置 後側主点位置
1 1 -10.77079 3.74700 -0.57077 0.24304
2 5 9.62416 4.97200 -1.27736 0.50691
3 14 22.04473 1.36200 0.29252 0.74942
ズームレンズ群倍率
群 始面 広角 中間 望遠
1 1 0.00000 0.00000 0.00000
2 5 -0.53173 -1.25661 -2.62009
3 14 0.81346 0.74992 0.78379
YW:広角端での全系の焦点距離fWにおける、第2レンズ群の、最大ぶれ補正時の光軸に対して垂直方向への移動量
を示し、ズームレンズ系が広角端の状態のとき、すなわち条件式(10)においてY=YW(f=fW)のときの対応値(YW/YT)/(fW/fT)を求めた。
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
P 平行平板
A 開口絞り
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 (20)
- 少なくとも1枚のレンズ素子で構成されたレンズ群を複数有するズームレンズ系であって、
物体側から像側へと順に、
負のパワーを有し、少なくとも2枚のレンズ素子からなる第1レンズ群と、
正のパワーを有する第2レンズ群とを備え、
撮像時の広角端から望遠端へのズーミングの際に、前記第1レンズ群と第2レンズ群との間隔が減少するように各レンズ群を光軸に沿ってそれぞれ移動させて変倍を行い、
以下の条件(1)及び(a)を満足する、ズームレンズ系:
fW/D1>7.5 ・・・(1)
Z=fT/fW>4.0 ・・・(a)
ここで、
fW:広角端における全系の焦点距離、
fT:望遠端における全系の焦点距離、
D1:第1レンズ群の最物体側に位置するレンズ素子の中心厚み
である。 - 第2レンズ群よりも像側に、正のパワーを有する第3レンズ群を備え、撮像時の広角端から望遠端へのズーミングの際に、前記第2レンズ群と第3レンズ群との間隔が増大するように各レンズ群を光軸に沿ってそれぞれ移動させて変倍を行う、請求項1に記載のズームレンズ系。
- 以下の条件(2)を満足する、請求項1に記載のズームレンズ系:
fT/D1>30.0 ・・・(2)
ここで、
fT:望遠端における全系の焦点距離、
D1:第1レンズ群の最物体側に位置するレンズ素子の中心厚み
である。 - 以下の条件(3)を満足する、請求項1に記載のズームレンズ系:
0.50<DG1/Ir<1.06 ・・・(3)
ここで、
DG1:第1レンズ群の中心厚み、
Ir:次式で表される値
Ir=fT×tan(ωT)、
fT:望遠端における全系の焦点距離、
ωT:望遠端における最大画角の半値(°)
である。 - 以下の条件(4)を満足する、請求項2に記載のズームレンズ系:
0.60<(DG1+DG3)/Ir<1.40 ・・・(4)
ここで、
DG1:第1レンズ群の中心厚み、
DG3:第3レンズ群の中心厚み、
Ir:次式で表される値
Ir=fT×tan(ωT)、
fT:望遠端における全系の焦点距離、
ωT:望遠端における最大画角の半値(°)
である。 - 以下の条件(5)を満足する、請求項1に記載のズームレンズ系:
0.01<D1/D12<0.40 ・・・(5)
ここで、
D1:第1レンズ群の最物体側に位置するレンズ素子の中心厚み、
D12:第1レンズ群の最物体側に位置するレンズ素子と該最物体側に位置するレンズ素子と隣り合うレンズ素子との空気間隔
である。 - 以下の条件(6)を満足する、請求項1に記載のズームレンズ系:
1.2<((2×D2×R2F×R2R)/(R2R-R2F))0.5/Ir<2.0
・・・(6)
ここで、
D2:第1レンズ群の最物体側に位置するレンズ素子と隣り合うレンズ素子の中心厚み、
R2F:第1レンズ群の最物体側に位置するレンズ素子と隣り合うレンズ素子の物体側面の曲率半径、
R2R:第1レンズ群の最物体側に位置するレンズ素子と隣り合うレンズ素子の像側面の曲率半径、
Ir:次式で表される値
Ir=fT×tan(ωT)、
fT:望遠端における全系の焦点距離、
ωT:望遠端における最大画角の半値(°)
である。 - 第1レンズ群が、物体側から像側へと順に、
最物体側に位置するレンズ素子である、負のパワーを有する第1レンズ素子と、
前記最物体側に位置するレンズ素子と隣り合うレンズ素子である、正のパワーを有し、物体側に凸面を向けたメニスカス形状の第2レンズ素子と
で構成される、請求項1に記載のズームレンズ系。 - 第1レンズ群が、非球面を有するレンズ素子を少なくとも1枚含む、請求項1に記載のズームレンズ系。
- 第1レンズ群が、少なくとも2面の非球面を含む、請求項1に記載のズームレンズ系。
- 第2レンズ群が、少なくとも1組の接合レンズ素子を含み、該接合レンズ素子の接合面が物体側に凸形状であり、以下の条件(7)を満足する、請求項1に記載のズームレンズ系:
1.03<Nd2/Nd1<2.00 ・・・(7)
ここで、
Nd1:接合レンズ素子の、最物体側に位置するレンズ素子のd線に対する屈折率、
Nd2:接合レンズ素子の、最物体側に位置するレンズ素子と接合しているレンズ素子のd線に対する屈折率
である。 - 第3レンズ群が、1枚のレンズ素子で構成される、請求項2に記載のズームレンズ系。
- 以下の条件(8)を満足する、請求項12に記載のズームレンズ系:
0.5<((2×D7×R7F×R7R)/(R7R-R7F))0.5/Ir<1.5
・・・(8)
ここで、
D7:第3レンズ群のレンズ素子の中心厚み、
R7F:第3レンズ群のレンズ素子の物体側面の曲率半径、
R7R:第3レンズ群のレンズ素子の像側面の曲率半径、
Ir:次式で表される値
Ir=fT×tan(ωT)、
fT:望遠端における全系の焦点距離、
ωT:望遠端における最大画角の半値(°)
である。 - 第3レンズ群のレンズ素子が、非球面を含む、請求項12に記載のズームレンズ系。
- 第3レンズ群のレンズ素子が、樹脂材料からなる、請求項12に記載のズームレンズ系。
- 第3レンズ群が、撮像時の広角端から望遠端へのズーミングの際に、物体側に凸の軌跡を描いて光軸に沿って移動する、請求項2に記載のズームレンズ系。
- 第2レンズ群が、光軸に対して垂直方向に移動する、請求項1に記載のズームレンズ系。
- 以下の条件(9)及び(10)を全系において満足する、請求項17に記載のズームレンズ系:
YT>Y ・・・(9)
1.5<(Y/YT)/(f/fT)<3.0 ・・・(10)
ここで、
f:全系の焦点距離、
fT:望遠端における全系の焦点距離、
Y:全系の焦点距離fにおける、第2レンズ群の、最大ぶれ補正時の光軸に対して垂直方向への移動量、
YT:望遠端での全系の焦点距離fTにおける、第2レンズ群の、最大ぶれ補正時の光軸に対して垂直方向への移動量
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、請求項1に記載の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、請求項1に記載のズームレンズ系である、カメラ。
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