CN101988985B - Zoom lens - Google Patents
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- CN101988985B CN101988985B CN201010236631.5A CN201010236631A CN101988985B CN 101988985 B CN101988985 B CN 101988985B CN 201010236631 A CN201010236631 A CN 201010236631A CN 101988985 B CN101988985 B CN 101988985B
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Abstract
The present invention provides a zoom lens which increases resolution and multiplying power without reduction of aperture ratio. The following components are successively provided from an objective side: a first group (G1) which has positive refractive power; a second group (G2) which has negative refractive power; a lens group (GK) which is set after the second group (G2). Furthermore the second group (G2) is successively provided with the following components from an objective side: a negative lens (L5) which has a dent surface that faces the image side, and a double-surface aspheric lens (L6). Furthermore, a lens surface (R10) of the objective side of the double-surface aspheric lens (L6) satisfies the following formulae: (1) sagM-sagZ<0, and (2) sagM/sagZ >2.3. When the zoom setting is varied from a wide-angle end to a telescopic end, the first group (G1) is fixed and the first group (G2) is moved to the image side for zooming, wherein, the sagM and the sagZ are respectively set to the depth of a lens set to an effective diameter position on the lens surface R10 of the wide angle end and the depth of the lens at the diameter position which is equal to 80% of the effective diameter.
Description
Technical Field
The present invention relates to a zoom lens, and more particularly, to a zoom lens in which a 1 st group is fixed and a 2 nd group is moved when a zoom setting is changed.
Background
Conventionally, there is known a high-magnification zoom lens having a zoom ratio of, for example, 30 or more and a high resolution, which is used in a video camera, an electronic still camera, or the like. As such a zoom lens having a large zoom ratio, for example, a zoom lens having a 1 st group having a positive refractive power, a 2 nd group having a negative refractive power, a 3 rd group having a positive refractive power, an aperture stop, and a 4 th group having a positive refractive power in this order is known.
Further, as such a zoom lens, there is known a zoom lens in which, when the setting of the zoom is changed to the wide angle side or the telephoto side, the 1 st group is fixed and the 2 nd group is moved to perform magnification change (see patent document 1).
Patent document 1: japanese patent laid-open No. 2007-148340
However, with the increase in the number of pixels of an image pickup device and the expansion of the application range of a video camera or an electronic still camera, a zoom lens having a higher resolution and a higher magnification is required as a zoom lens to be applied to such a video camera or an electronic still camera.
Here, it is relatively easy to increase the magnification ratio by reducing the aperture ratio, but if this is done, the light amount may be insufficient in the shooting in a dark place. Further, if the aperture ratio is increased so as not to cause insufficient light, the size of the apparatus may be increased.
Therefore, there is a demand for a zoom lens that can achieve higher resolution and higher magnification while maintaining a diameter ratio and a device size that can be applied to a small-sized surveillance camera and the like.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide a compact zoom lens having a high resolution and a high magnification without reducing an aperture ratio.
The zoom lens of the present invention is characterized by comprising, in order from an object side: when the zoom ratio is changed from the wide-angle end to the telephoto end, the 1 st group is fixed, and the 2 nd group is moved along the optical axis toward the image side to perform magnification change, and the 2 nd group includes, in order from the object side: and a negative lens having a concave surface facing the image side, and a double-sided aspherical lens, wherein a lens surface of the double-sided aspherical lens on the object side satisfies formula (1) sagM-sagZ < 0 and formula (2) sagM/sagZ > 2.3.
Where sagM is a lens depth at an effective diameter position on a lens surface on the object side of the double-sided aspherical lens when the zoom lens is set at the wide-angle end, and sagZ is a lens depth at a diameter position of 80% of an effective diameter on a lens surface on the object side of the aspherical lens when the zoom lens is set at the wide-angle end.
The lens depth at the effective diameter position of the lens surface is a distance in the optical axis direction from a position of an intersection point intersecting the optical axis on the lens surface to the effective diameter position on the lens surface. The lens depth at a diameter position of 80% of the effective diameter of the lens surface is a distance in the optical axis direction from a position of an intersection point on the lens surface, the intersection point intersecting the optical axis, to a diameter position of 80% of the effective diameter of the lens surface.
The lens depth value is negative when the effective diameter position or the diameter position of 80% of the effective diameter on the lens surface is closer to the object side than the position of the intersection point on the lens surface, and positive when the effective diameter position or the diameter position of 80% of the effective diameter on the lens surface is closer to the image side than the position of the intersection point on the lens surface.
Preferably, the group 2 includes, in order from the object side: the negative lens, the aspherical double-sided lens, the negative lens, and the positive lens, which have concave surfaces facing the image side, are joined to each other to form a cemented lens.
Preferably, the zoom lens includes a stop between the 2 nd group and the subsequent lens group, the subsequent lens group includes the 3 rd group of positive refractive power and the 4 th group of positive refractive power in order from the object side, and when the zoom setting is changed from the wide-angle end to the telephoto end, the 1 st group and the 3 rd group are fixed, the 2 nd group is moved along the optical axis to zoom to the image side, and the 4 th group is moved along the optical axis to correct and focus the image plane.
The group 3 may include only 3 positive aspherical double lenses, a positive meniscus lens having a concave surface facing the object side, and a negative lens having a concave surface facing the object side in this order from the object side.
The 4 th group may include 3 pieces of positive aspherical surface lenses, positive lenses, and negative lenses in this order from the object side, and the positive lenses and the negative lenses may be joined to each other to form a cemented lens.
The aspherical double-sided lens of group 2 may be a plastic lens.
The zoom lens of the present invention includes, in order from an object side: a group 1 having positive refractive power, a group 2 having negative refractive power, and a lens group subsequent to the group 2, wherein the group 1 is fixed and the group 2 is moved along the optical axis toward the image side to be magnified when the zoom setting is changed from the wide-angle end to the telephoto end, and the group 2 includes, in order from the object side: a negative lens having a concave surface facing the image side, and a double-sided aspherical lens, wherein the lens surfaces of the double-sided aspherical lens at the object side satisfy formula (1): sagM-sagZ < 0 and formula (2): since sagM/sagZ > 2.3, a compact zoom lens with high resolution and high magnification without reducing the aperture ratio can be obtained, and a compact high-magnification zoom lens with high resolution suitable for a monitoring camera or the like can be realized.
Further, if the lens surface on the object side of the double-sided aspherical lens of group 2 is shaped so as not to satisfy expressions (1) and (2), in particular, field curvature (also referred to as field curvature) and coma aberration (also referred to as coma aberration) increase, and it becomes difficult to correct the image aberration in a manner of suppressing the image aberration over the entire zoom range.
Drawings
Fig. 1 is a cross-sectional view showing a schematic configuration of a zoom lens according to an embodiment of the present invention in a state set at a wide-angle end, together with an optical path of a light beam passing through the zoom lens.
Fig. 2 is an enlarged schematic view of optical paths of rays passing through the 2 nd group of the above-described zoom lens set at the wide-angle end.
Fig. 3 is a cross-sectional view showing a schematic configuration of the zoom lens set at the telephoto end, together with an optical path of light passing through the zoom lens.
Fig. 4A is a diagram showing a schematic configuration of a zoom lens of embodiment 1 in a state set at the wide-angle end.
Fig. 4B is a diagram showing longitudinal aberrations of the zoom lens of embodiment 1 set at the wide-angle end.
Fig. 4C is a diagram showing the longitudinal aberration of the zoom lens of example 1 set at the telephoto end.
Fig. 4D is a diagram showing lateral aberrations of the zoom lens of example 1 set at the wide-angle end.
Fig. 4E is a diagram showing lateral aberrations of the zoom lens of example 1 set at the telephoto end.
Fig. 5A is a diagram showing a schematic configuration of a zoom lens of embodiment 2 in a state set at the wide-angle end.
Fig. 5B is a diagram showing longitudinal aberrations of the zoom lens of embodiment 2 set at the wide-angle end.
Fig. 5C is a diagram showing the longitudinal aberration of the zoom lens of example 2 set at the telephoto end.
Fig. 5D is a diagram showing lateral aberrations of the zoom lens of example 2 set at the wide-angle end.
Fig. 5E is a diagram showing lateral aberrations of the zoom lens of example 2 set at the telephoto end.
Fig. 6A is a diagram showing a schematic configuration of a zoom lens of embodiment 3 in a state set at the wide-angle end.
Fig. 6B is a diagram showing longitudinal aberrations of the zoom lens of example 3 set at the wide-angle end.
Fig. 6C is a diagram showing the longitudinal aberration of the zoom lens of example 3 set at the telephoto end.
Fig. 6D is a diagram showing lateral aberrations of the zoom lens of example 3 set at the wide-angle end.
Fig. 6E is a diagram showing lateral aberrations of the zoom lens of example 3 set at the telephoto end.
Fig. 7A is a diagram showing a schematic configuration of a zoom lens of embodiment 4 in a state set at the wide-angle end.
Fig. 7B is a diagram showing longitudinal aberrations of the zoom lens of example 4 set at the wide-angle end.
Fig. 7C is a diagram showing the longitudinal aberration of the zoom lens of example 4 set at the telephoto end.
Fig. 7D is a diagram showing lateral aberrations of the zoom lens of example 4 set at the wide-angle end.
Fig. 7E is a diagram showing lateral aberrations of the zoom lens of example 4 set at the telephoto end.
Fig. 8A is a diagram showing a schematic configuration of a zoom lens of embodiment 5 in a state set at the wide-angle end.
Fig. 8B is a diagram showing longitudinal aberrations of the zoom lens of example 5 set at the wide-angle end.
Fig. 8C is a diagram showing the longitudinal aberration of the zoom lens of example 5 set at the telephoto end.
Fig. 8D is a diagram showing lateral aberrations of the zoom lens of example 5 set at the wide-angle end.
Fig. 8E is a diagram showing lateral aberrations of the zoom lens of example 5 set at the telephoto end.
Fig. 9A is a diagram showing a schematic configuration of a zoom lens of example 6 in a state set at the wide-angle end.
Fig. 9B is a diagram showing longitudinal aberrations of the zoom lens of example 6 set at the wide-angle end.
Fig. 9C is a diagram showing the longitudinal aberration of the zoom lens of example 6 set at the telephoto end.
Fig. 9D is a diagram showing lateral aberrations of the zoom lens of example 6 set at the wide-angle end.
Fig. 9E is a diagram showing lateral aberrations of the zoom lens of example 6 set at the telephoto end.
Fig. 10 is a diagram showing a video camera configured by using the zoom lens of the present invention.
In the figure: g1-group 1, G2-group 2, GK-subsequent lens group, L5-negative lens, L6-double-sided aspherical lens, R10-lens surface of object side of double-sided aspherical lens L6, Z1-optical axis.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a cross-sectional view showing a schematic configuration of a zoom lens according to an embodiment of the present invention together with an optical path of a light beam passing through the zoom lens. Fig. 1 shows a state in which the zoom lens described above is set at the wide-angle end. Fig. 2 is a cross-sectional view showing an enlarged optical path of a ray passing through the 2 nd group of the zoom lens set at the wide-angle end, and fig. 3 is a cross-sectional view showing a schematic configuration of the zoom lens set at the telephoto end.
The zoom lens 100 shown in the drawing includes, in order from the object side (Z side in the drawing): when the zoom setting is changed from the wide-angle end to the telephoto end, the lens group GK after the 1 st group G1, the 2 nd group G2, and the 2 nd group G2 having positive refractive power is fixed in position with respect to the 1 st group G1, and is changed in magnification by moving the position of the 2 nd group G2 to the image side (the + Z side in the drawing) along the optical axis Z1.
The group 2G 2 of the zoom lens 100 includes, in order from the object: the negative lens L5 and the aspherical doublet L6 each have a concave surface facing the image side, and the object-side lens surface R10 of the aspherical doublet L6 satisfies formula (1) sagM-sagZ < 0 and formula (2) sagM/sagZ > 2.3.
In addition, as shown in fig. 2, sagM is a value of the lens depth De100 at a position E100 of an effective diameter on the lens surface R10 on the object side of the aspherical double-sided lens L6 when the zoom lens 100 is set at the wide-angle end.
Also, as shown in fig. 2, sagZ is a value of the lens depth De80 at a diameter position E80 of 80% of an effective diameter on the lens surface R10 on the object side of the aspherical lens L6 of the 2 nd group G2 when the zoom lens 100 is set at the wide-angle end.
The lens depth De100 is a distance in the optical axis direction (Z direction) from a position P10 of an intersection point where the lens surface R10 intersects the optical axis Z1 to a position E100 of the effective diameter on the lens surface R10, and is expressed by a negative value when the effective diameter position E100 is on the object side with reference to a position P10, and by a positive value when the effective diameter position E100 is on the image side with reference to a position P10. Accordingly, in fig. 2, the value of sagM indicating the lens depth is a negative value because the effective diameter position E100 is on the object side with reference to the position P10, and the magnitude thereof (the absolute value of the value) is the distance in the optical axis direction (Z direction) from the position P10 to the effective diameter position E100.
The sagZ value indicating the lens depth De80 at the diameter position E80 of 80% of the effective diameter on the lens surface R10 is also defined in the same manner as in the above-described sagM.
The effective diameter of the lens surface constituting the lens having the rotationally symmetric shape is fixed at a fixed distance from the optical axis Z1 of the lens.
Hereinafter, although not essential to the invention of the present application, preferred configurations of the invention of the present application will be described. The zoom lens 100 includes these structures.
In fig. 1 and 3, lenses L1 to L15 constituting the zoom lens 100 are shown in order from the object side (in the-Z direction in the figure) to the image side (in the + Z direction in the figure), and lens surfaces R1 to R27 of the lenses L1 to L15 are shown in order from the object side to the image side.
Here, a lens surface R2 represents a joint surface between the lens L1 and the lens L2, a lens surface L13 represents a joint surface between the lens L7 and the lens L8, and a lens surface R24 represents a joint surface between the lens L13 and the lens L14.
Note that, with respect to the lens surface R2, a lens surface on the image side of the lens L1 and a lens surface on the object side of the lens L2 are denoted by a common reference symbol R2. The same applies to the lens surfaces R13 and R24 which are other bonding surfaces.
The parallel plane plate L15 is a filter for blocking unnecessary light incident on the imaging surface.
Further, light incident from the object side to the zoom lens 100 is imaged on an imaging surface Jk by the zoom lens 100.
Aperture stop St is disposed between group 2G 2 and lens group GK.
The group 1G 1 includes, in order from the object side: lens L1, lens L2, lens L3, and lens L4, lens L1 and lens L2 constitute a cemented lens S12 in which both are cemented.
The group 2G 2 includes only 4 lenses, i.e., a negative lens L5, a aspherical double-sided lens L6, a negative lens L7, and a positive lens L8, which have concave surfaces facing the image side in this order from the object side, and the negative lens L7 and the positive lens L8 are joined to each other to form a joined lens S78. When the group 2G 2 is configured as described above, aberrations can be corrected satisfactorily over the entire zoom range of the zoom lens 100.
The lens group GK following the group 2G 2 includes, in order from the object: group 3 having positive refractive power, group 4 having positive refractive power. Therefore, when the zoom setting is changed from the wide-angle end to the telephoto end, the 1 st group G1 and the 3 rd group G3 are fixed to the image plane Jk, and the 2 nd group G2 is moved along the optical axis Z1 to the image side to perform magnification change, and the 4 th group G4 is moved along the optical axis Z1 to perform image plane correction and focusing. By configuring the subsequent lens group GK in this manner, the zoom lens 100 can be further downsized.
The fixing and movement of the position when the zoom lens 100 is set for zooming are fixing and movement of the position of each group with respect to the position of the image forming surface Jk.
The correction of the image point position (correction of the image plane) is a correction in which the 2 nd group is moved along the optical axis to be multiplied and the variation of the image point position accompanying the multiplication is corrected by the 4 th group, and the focusing is an adjustment of the imaging position in which the image formed by the zoom lens is positioned on the imaging plane Jk.
The group 3G 3 is a 3-piece lens group including, in order from the object side, only a positive aspherical lens L9, a positive meniscus lens L10 having a concave surface facing the object side, and a negative lens L11 having a concave surface facing the object side. When the group 3G 3 is configured in this manner, the zoom lens 100 can be further downsized.
The 4 th group G4 is a 3-piece lens group including only a positive aspherical lens L12, a positive lens L13, and a negative lens L4 in this order from the object side, and the positive lens L13 and the negative lens L4 are both joined to form a cemented lens S1314. With the group 4G 4 configured as described above, the distance variation in focusing (focusing) can be reduced.
The aspherical double-sided lens L6 of group 2G 2 may be a plastic lens. Thus, the cost of the lens member required for suppressing various aberrations can be reduced and the apparatus cost can be reduced.
< specific examples >
Next, numerical data and the like relating to the zoom lenses of examples 1 to 6 will be collectively described with reference to fig. 4 (fig. 4A, 4B, 4C, 4D, and 4E) to fig. 9 (fig. 9A, 9B, 9C, 9D, and 9E) and tables 1 (tables 1a, 1B, and 1C) to 6 (tables 6a, 6B, and 6C).
In addition, the values of sagM-sagZ and the values of sagM/sagZ when the respective zoom lenses from embodiment 1 to embodiment 6 are set at the wide-angle end are shown below.
Example 1: the value of sagM-sagZ is-0.010, and the value of sagM/sagZ is 2.70
Example 2: the value of sagM-sagZ is-0.009, and the value of sagM/sagZ is 8.20
Example 3: the value of sagM-sagZ is-0.008 and the value of sagM/sagZ is 4.57
Example 4: the value of sagM-sagZ is-0.007, and the value of sagM/sagZ is 3.04
Example 5: the value of sagM-sagZ is-0.010, and the value of sagM/sagZ is 2.84
Example 6: the value of sagM-sagZ is-0.010, and the value of sagM/sagZ is 2.76
Tables 1 to 6 show basic data of the zoom lenses of examples 1 to 6, respectively.
The lens data are shown in tables 1a to 6a, and the difference between the setting at the wide angle end and the setting at the telephoto end is shown in tables 1b to 6b in comparison. Table 1c to table 6c show coefficients of aspheric expressions indicating shapes of aspheric surfaces used in the zoom lenses.
In the lens data in tables 1a to 6a, the lens surface number is indicated as the i-th (i is 1, 2, 3, …) surface number which increases in order from the object side to the image side. Note that these lens data do not include the surface numbers of the aperture stop St and the imaging surface Jk, but include the surface numbers of the object-side surface and the image-side surface of the parallel plane plate L15 (i is 26 and 27).
Ri denotes a paraxial curvature radius of the ith (i: 1, 2, 3, …) plane, and Di (i: 1, 2, 3, …) denotes a plane interval on the optical axis Z1 between the ith plane and the (i + 1) th plane. Note that a symbol Ri indicating a paraxial radius of curvature of the lens data corresponds to a symbol Ri (i is 1, 2, 3, and …) indicating a lens surface in fig. 1.
Note that the lens surface R2 serving as a joint surface is a lens surface in which the lens surface on the image side of the lens L1 and the lens surface on the object side of the lens L2 are denoted by the common reference symbol R2. The lens surface R13 serving as a joint surface is a lens surface that is represented by the common reference symbol R13 for the image side lens surface of the lens L7 and the object side lens surface of the lens L8. The lens surface R24 serving as a joint surface is a lens surface in which the image-side lens surface of the lens L13 and the object-side lens surface of the lens L14 are denoted by the common reference symbol R24.
Nej denotes a refractive index for the e-line (wavelength 546.1nm) of the j-th (j is 1, 2, 3, …) optical element which increases in order from the object side toward the image side, and vdj denotes an abbe number for the d-line (wavelength 587.6nm) of the j-th optical element.
The paraxial radius of curvature and the surface interval are expressed in units of mm, and the paraxial radius of curvature is positive when it is convex toward the object side and negative when it is convex toward the image side.
The comparison between the settings at the wide-angle end and the settings at the telephoto end shown in tables 1b to 6b shows the difference between the distances D7, D14, D20, D25, and the focal length f'.
The coefficients KA, B3, B4, and B5 … of the aspherical surface formulae shown in tables 1c to 6c are coefficients applied to the following aspherical surface formulae.
[ number 1 ]
Z is the aspheric depth (from a point on the aspheric surface at height Y depending on the tangent to the aspheric vertex and on the aspheric surface
The length of the perpendicular to the plane where the optical axis is perpendicular) (mm),
y is height (distance from the optical axis) (mm),
r is the paraxial radius of curvature (mm),
bi represents an aspheric coefficient (i is 3 to n),
KA is a conic constant
[ Table 1a ]
Example 1
[ Table 1b ]
Example 1
[ Table 1c ]
[ Table 2a ]
Example 2
[ Table 2b ]
Example 2
[ Table 2c ]
[ Table 3a ]
Example 3
[ Table 3b ]
Example 3
[ Table 3c ]
[ Table 4a ]
Example 4
[ Table 4b ]
Example 4
[ Table 4c ]
[ Table 5a ]
Example 5
[ Table 5b ]
Example 5
[ Table 5c ]
[ Table 6a ]
Example 6
[ Table 6b ]
Example 6
[ Table 6c ]
Fig. 4A, 5A, and … 9A are cross-sectional views showing a schematic configuration of the zoom lens according to embodiments 1 to 6 in a state in which the zoom lens is set at the wide-angle end, and the reference numerals in fig. 4A to 9A that coincide with the reference numerals in fig. 1 to 3 described above indicate portions corresponding to each other.
Fig. 4B, 5B, and … 9B are diagrams illustrating longitudinal aberrations at the wide-angle end of the zoom lenses according to examples 1 to 6, respectively.
Fig. 4C, 5C, and … 9C are diagrams illustrating longitudinal aberrations at the telephoto end of each of the zoom lenses according to embodiments 1 to 6.
Fig. 4D, 5D, and … 9D are diagrams illustrating lateral aberrations at the wide-angle end of the zoom lenses of examples 1 to 6, respectively.
Fig. 4E, 5E, and … 9E are diagrams showing lateral aberrations at the telephoto end of the zoom lenses according to examples 1 to 6.
In each graph showing the aberration, the aberration at a wavelength of 546.1nm (e line), a wavelength of 460.0nm, and a wavelength of 615.0nm are shown.
In each graph showing the aberration, a solid line is shown for a wavelength of 546.1nm (e-line), a broken line is shown for a wavelength of 460.0nm, and a dot-dash line is shown for a wavelength of 615.0 nm.
In each of the figures showing the lateral aberration, coma aberration is shown, and coma aberration in the sagittal direction and coma aberration in the meridional direction are shown in correspondence with each other in the lateral direction.
In addition, an angle shown by the vertical axis of a graph relating to astigmatism (also referred to as astigmatism) and distortion (also referred to as distortion aberration) in a graph showing longitudinal aberration is a half angle of view. Assuming that the half angle of view is ω, the distortion in the figure is an aberration in which the amount of shift in the image height direction from the ideal image height is expressed by percentage when the focal length of the entire zoom lens system is f, the angle of view is θ (variable, 0 ≦ θ ≦ ω), and the ideal image height is f × tan θ.
The astigmatism in the figure is an aberration indicating a shift amount in the optical axis direction from the paraxial image plane when the angle of view is θ (variable, 0. ltoreq. theta. ltoreq. omega.).
As is clear from the graphs showing the basic data and various aberrations of examples 1 to 6, the zoom lens of the present invention can obtain a compact zoom lens with high resolution and high magnification without reducing the aperture ratio by optimizing the shape and material of each lens.
Fig. 10 shows a configuration of a camera 101 configured by using a zoom lens 100 according to an embodiment of the present invention as an example of an imaging apparatus according to an embodiment of the present invention. Fig. 10 schematically shows the 1 St group G1, the 2 nd group G2, the aperture stop St, the 3 rd group G3, and the 4 th group G4 included in the zoom lens 100, and double arrows are added to the moving direction of the 2 nd group G2 and the 4 th group G4 that move during magnification variation.
The camera 101 includes: a zoom lens 100, a filter 2 having functions of a low-pass filter, an infrared cut filter, and the like, which is disposed on the image side of the zoom lens 100, an image pickup device 4 disposed on the image side of the filter 2, and a signal processing circuit 5. Here, the position of the light receiving surface of the image pickup element 4 coincides with the position of the image forming surface Jk of the zoom lens 100.
An image of an object is formed on a light receiving surface of the image pickup device 4 by the zoom lens 100, an image signal carrying the image output from the image pickup device 4 is processed by the signal processing circuit 5, and a visible image representing the image is displayed on the display device 6.
The present invention is not limited to the above-described embodiments and examples, and various modifications may be made. For example, the radius of curvature, refractive index, dispersion, or surface spacing between lenses of each lens is not limited to the above values, and may have other values.
Claims (6)
1. A zoom lens characterized in that a lens element is provided,
composed of a 1 st group, a 2 nd group and a lens group in order from the object side,
the above group 1, having positive refractive power;
the above group 2, having negative refractive power;
the lens group, which is subsequent to the group 2,
an aperture stop is provided between the 2 nd group and the subsequent lens group,
the above-mentioned subsequent lens groups are composed of a 3 rd group having positive refractive power and a 4 th group having positive refractive power in order from the object side,
when the zoom setting is changed from the wide-angle end to the telephoto end, the 1 st group and the 3 rd group are fixed, the 2 nd group is moved to the image side to perform zooming, and the 4 th group is moved in the optical axis direction to perform image plane correction and focusing,
the 2 nd group includes, in order from the object side, a negative lens having a concave surface facing the image side, and a aspherical bifacial lens, and a lens surface on the object side of the aspherical bifacial lens satisfies the following expressions (1) and (2):
sagM-sagZ<0…(1)
sagM／sagZ>2.3…(2)
wherein,
sagM is a lens depth at an effective diameter position on the lens surface on the object side of the above-described double-sided aspherical lens when the zoom lens is set at the wide-angle end,
sagZ is a lens depth at a diameter position of 80% of an effective diameter on a lens surface on the object side of the above-described double-sided aspherical lens when the zoom lens is set at the wide-angle end.
2. The variable focus lens of claim 1,
the group 2 includes only, in order from the object side: a negative lens having a concave surface facing the image side, the aspherical bifacial lens, a negative lens, and a positive lens, wherein the negative lens and the positive lens are joined to each other to form a joined lens.
3. The variable focus lens of claim 1,
the group 3 includes, in order from the object side: a positive double-sided aspherical lens, a positive meniscus lens with a concave surface facing the object side, and a negative lens with a concave surface facing the object side.
4. The variable focus lens of claim 2,
the group 3 includes, in order from the object side: a positive double-sided aspherical lens, a positive meniscus lens with a concave surface facing the object side, and a negative lens with a concave surface facing the object side.
5. Zoom lens according to any of claims 1 to 4,
the group 4 includes, in order from the object side: a positive double-sided aspherical lens, a positive lens, a negative lens,
the positive lens and the negative lens are joined to each other to form a joined lens.
6. An image pickup apparatus is characterized in that,
a zoom lens according to any one of claims 1 to 5.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009176111A JP5496565B2 (en) | 2009-07-29 | 2009-07-29 | Zoom lens |
| JP2009-176111 | 2009-07-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101988985A CN101988985A (en) | 2011-03-23 |
| CN101988985B true CN101988985B (en) | 2014-04-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010236631.5A Expired - Fee Related CN101988985B (en) | 2009-07-29 | 2010-07-23 | Zoom lens |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP5496565B2 (en) |
| CN (1) | CN101988985B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5528157B2 (en) * | 2010-02-26 | 2014-06-25 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| JP5751991B2 (en) * | 2011-08-30 | 2015-07-22 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
| WO2018123672A1 (en) * | 2016-12-28 | 2018-07-05 | パナソニックＩｐマネジメント株式会社 | Imaging optical system, and imaging device and camera system provided with same |
| JP6692304B2 (en) * | 2017-01-27 | 2020-05-13 | 富士フイルム株式会社 | Zoom lens and imaging device |
| CN113625420B (en) * | 2020-05-06 | 2022-10-04 | 华为技术有限公司 | Optical lens, lens module and terminal |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002365540A (en) * | 2001-06-05 | 2002-12-18 | Matsushita Electric Ind Co Ltd | Camera shake compensating function mounting zoom lens, camera shake compensated function mounting video camera, optical instrument and optical device |
| CN1682141A (en) * | 2002-09-10 | 2005-10-12 | 松下电器产业株式会社 | Image stabilization zoom lens |
| JP2006154481A (en) * | 2004-11-30 | 2006-06-15 | Konica Minolta Opto Inc | Variable power optical system, imaging lens device and digital equipment |
| JP2006163075A (en) * | 2004-12-08 | 2006-06-22 | Konica Minolta Opto Inc | Variable power optical system, imaging lens device, and digital equipment |
| CN1967312A (en) * | 2005-11-17 | 2007-05-23 | 松下电器产业株式会社 | Zoom lens system, imaging device and camera |
| JP5224125B2 (en) * | 2008-12-18 | 2013-07-03 | アイシン精機株式会社 | Driving force transmission device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3196283B2 (en) * | 1992-02-13 | 2001-08-06 | ミノルタ株式会社 | Zoom lens device |
| JPH11242158A (en) * | 1998-02-26 | 1999-09-07 | Minolta Co Ltd | Zoom lens |
| JPH11242159A (en) * | 1998-02-26 | 1999-09-07 | Minolta Co Ltd | Zoom lens |
| JP5038685B2 (en) * | 2005-11-17 | 2012-10-03 | パナソニック株式会社 | Zoom lens system, imaging device and camera |
-
2009
- 2009-07-29 JP JP2009176111A patent/JP5496565B2/en not_active Expired - Fee Related
-
2010
- 2010-07-23 CN CN201010236631.5A patent/CN101988985B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002365540A (en) * | 2001-06-05 | 2002-12-18 | Matsushita Electric Ind Co Ltd | Camera shake compensating function mounting zoom lens, camera shake compensated function mounting video camera, optical instrument and optical device |
| CN1682141A (en) * | 2002-09-10 | 2005-10-12 | 松下电器产业株式会社 | Image stabilization zoom lens |
| JP2006154481A (en) * | 2004-11-30 | 2006-06-15 | Konica Minolta Opto Inc | Variable power optical system, imaging lens device and digital equipment |
| JP2006163075A (en) * | 2004-12-08 | 2006-06-22 | Konica Minolta Opto Inc | Variable power optical system, imaging lens device, and digital equipment |
| CN1967312A (en) * | 2005-11-17 | 2007-05-23 | 松下电器产业株式会社 | Zoom lens system, imaging device and camera |
| JP5224125B2 (en) * | 2008-12-18 | 2013-07-03 | アイシン精機株式会社 | Driving force transmission device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5496565B2 (en) | 2014-05-21 |
| JP2011028144A (en) | 2011-02-10 |
| CN101988985A (en) | 2011-03-23 |
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