CN104698575B - Zoom lens, lens unit and camera device - Google Patents
Zoom lens, lens unit and camera device Download PDFInfo
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- CN104698575B CN104698575B CN201410737277.2A CN201410737277A CN104698575B CN 104698575 B CN104698575 B CN 104698575B CN 201410737277 A CN201410737277 A CN 201410737277A CN 104698575 B CN104698575 B CN 104698575B
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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
- G02B15/163—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—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 first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The present invention provides zoom lens, carries the lens unit and camera device of the zoom lens, reply wide angle, ensures big relative aperture, each aberration of well-corrected.Zoom lens is made up of the first lens group, the second lens group, the 3rd lens group, the 4th lens group, the 5th lens group configured successively from object side, first lens group has reflection part, 4th lens group is made up of the 41st lens, the 42nd lens successively from object side, 5th lens group is made up of the 51st lens, the 52nd lens, the 53rd lens successively from object side, is met：‑1.50<f2/fw<‑1.003.30<f4/fw<4.300.3<|β4T/β4W|<1.0 wherein, the lateral magnification of the telescope end of the lens groups of lateral magnification β 4T the 4th of the wide-angle side of the lens groups of synthesis focal length mm β 4W the 4th of the whole system of the focal length mmfw wide-angle sides of the lens groups of focal length mmf4 the 4th of the lens groups of f2 second.
Description
Technical Field
The present invention relates to a zoom lens, a lens unit, and an imaging device, and more particularly to a zoom lens having a high magnification ratio and an image blur correction function and capable of achieving a reduction in size, a reduction in thickness, and a wider angle, a lens unit including the zoom lens, and an imaging device, such as an optical unit for capturing a still image or a moving image of a subject using an imaging element.
Background
Conventionally, as an optical system capable of reducing the thickness of a camera, a bending optical system in which the first lens group, which is the lens group closest to the object side in a zoom lens, has an optical axis bent by using a reflecting member such as a prism) has been widely used. By mounting such a buckling optical system on a camera, imaging can be performed without causing the lens to protrude from the camera body when in use, and therefore, the waterproof property and impact resistance of the camera can be improved.
On the other hand, in view of the demand for a thinner imaging device, there has recently been a demand for a zoom lens having a higher zoom ratio, a wider angle, and a larger diameter. The following patent publications disclose optical systems that meet such demands for imaging devices (see, for example, patent documents 1 and 2).
Patent document 1: japanese patent laid-open publication No. 2011-
Patent document 2: japanese patent laid-open publication No. 2011-141328
However, the zoom lens described in patent document 1 has a relatively simple four-group structure, but has a problem that a wide angle of focus cannot be achieved. The zoom lens described in patent document 2 has a five-group structure and can achieve a wide angle of a focal length, but has a problem of a large F-number (dark) at the wide angle end, and cannot satisfy both the wide angle of the focal length and the brightness.
Disclosure of Invention
The present invention has been made in view of the above problems, and an object of the present invention is to provide a zoom lens capable of correcting various aberrations more favorably while securing a large relative aperture in response to a wide angle of view, and a lens unit and an imaging device incorporating the zoom lens.
In order to achieve at least one of the above objects, a zoom lens reflecting one side of the present invention is composed of, arranged in order from an object side, a first lens group having positive power which does not move at the time of magnification change, a second lens group having negative power which moves along an optical axis at the time of magnification change, a third lens group having positive power which includes a stop and does not move at the time of magnification change, a fourth lens group having positive power which moves along the optical axis at the time of magnification change, and a fifth lens group which does not move at the time of magnification change,
the first lens group has a reflecting member for bending an optical axis,
the fourth lens group is composed of, in order from the object side, a 41 th lens having negative refractive power and a 42 th lens having positive refractive power,
the fifth lens group is composed of a 51 st lens with negative focal power, a 52 nd lens with positive focal power and a 53 th lens in sequence from the object side, and the zoom lens satisfies the following conditional expression:
-1.50<f2/fw<-1.00 (1)
3.30<f4/fw<4.30(2)
0.3<|β4T/β4W|<1.0 (3)
wherein,
f 2: focal length (mm) of the second lens group
f 4: focal length (mm) of the fourth lens group
fw: synthetic focal length (mm) of the entire system at wide-angle end
β 4W: a lateral magnification of a wide-angle end of the fourth lens group
Beta 4T: a lateral magnification of a telephoto end of the fourth lens group.
The basic structure of the present invention is composed of, in order from the object side, a first lens group having positive power, a second lens group having negative power, a third lens group having positive power, a fourth lens group having positive power, and a fifth lens group.
The first lens group, the third lens group, and the fifth lens group are configured not to move in the optical axis direction during magnification variation or focusing. By fixing the first lens group, the lens closest to the object side does not protrude during shooting, and therefore, the oppressive feeling of the shooting object can be avoided. Further, if the configuration is such that the lens closest to the object side does not protrude when the image pickup apparatus is inadvertently dropped, the influence of the impact of the drop can be reduced, and such a configuration is preferable. Further, by fixing the third lens group, even in the case where the third lens group has an iris diaphragm mechanism, the structure does not become complicated but is a simple mechanism. Further, by fixing the fifth lens group, a space between the lens closest to the image side of the fifth lens group and the solid-state imaging element can be closed, and foreign substances or dust can be prevented from entering the imaging element.
Further, the second lens group and the fourth lens group are configured to move along the optical axis during zooming or focusing, and when a zooming operation is performed from the wide-angle end to the telephoto end, the second lens group is moved in the image-side direction and the fourth lens group is moved in the object-side direction, whereby the zooming function can be shared between the two lens groups.
Since the first lens group has a reflecting member for bending (meandering) the optical axis, the size in the incident optical axis direction is reduced, and the size (thickness) in the depth direction of the imaging device can be reduced.
The fourth lens group is composed of a lens having negative refractive power (41 st lens) and a lens having positive refractive power (42 th lens) in this order from the object side, and thus astigmatism can be corrected well and high optical performance can be ensured.
The fifth lens group is composed of a lens having negative refractive power (51 st lens), a lens having positive refractive power (52 th lens), and a lens (53 th lens) from the object side, and is a combination of a lens having negative refractive power and a lens having positive refractive power, whereby occurrence of various aberrations such as chromatic aberration of magnification can be suppressed. The fifth lens group may have positive power or negative power, and the 53 th lens group may have positive power or negative power or no power.
The conditional expression (1) is a conditional expression for specifying the power of the second lens group and the focal length at the wide-angle end of the entire lens system. When the value of conditional expression (1) is lower than the upper limit, overcorrection in the negative direction by the petzval can be suppressed, and when the value of conditional expression (1) exceeds the lower limit, the amount of movement of the second lens group for magnification change does not become excessively large, and the lens unit can be made compact. Further, the following conditional expressions are preferably satisfied.
-1.40<f2/fw<-1.00 (1)’
The conditional expression (2) is a conditional expression that specifies the power of the fourth lens group and the focal length at the wide-angle end of the entire lens system. When the value of conditional expression (2) exceeds the lower limit value, the power of the fourth lens group does not become excessively weak, and the optical system can be miniaturized even if the movement amount necessary for magnification variation is secured. When the value of conditional expression (2) is lower than the upper limit value, the refractive power of the fourth lens group does not become excessively strong, so that it is possible to effectively suppress the occurrence of an excessive aberration, and to effectively suppress an excessive change in optical performance due to a manufacturing error of the fourth lens group. Further, the following conditional expressions are preferably satisfied.
3.40<f4/fw<4.00 (2)’
Conditional expression (3) specifies the lateral magnification at the telephoto end and the lateral magnification at the wide-angle end of the fourth lens group. When the value of conditional expression (3) is lower than the upper limit, the fluctuation amount of curvature of field does not become excessively large, and correction is easily performed by another lens group (in this case, a lens group other than the fourth lens group). Conversely, when the value of conditional expression (3) exceeds the lower limit, a high zoom ratio is easily obtained. The effect of the conditional expression (1) is further improved by satisfying the conditional expressions (2) and (3). Further, the following conditional expressions are preferably satisfied.
0.3<|β4T/β4W|<0.9 (3)’
The present lens unit mounts the zoom lens described above on a lens barrel that holds the zoom lens.
The imaging device is equipped with the zoom lens, a lens barrel holding the zoom lens, and a solid-state imaging element that photoelectrically converts an image formed by the zoom lens.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide a zoom lens, a lens unit having the zoom lens mounted thereon, and an imaging device, which can further favorably correct various aberrations while ensuring a large relative aperture in response to a wide angle of view.
Drawings
Fig. 1 is a front perspective view of an imaging device 10 according to the present embodiment.
Fig. 2 is a rear side perspective view of the imaging device 10 of the present embodiment.
Fig. 3(a) is a sectional view at the wide-angle end of the zoom lens of embodiment 1, fig. 3(b) is a sectional view at the middle of the zoom lens of embodiment 1, and fig. 3(c) is a sectional view at the telephoto end of the zoom lens of embodiment 1.
Fig. 4(a) is an aberration diagram of spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens of embodiment 1, fig. 4(b) is an aberration diagram of spherical aberration, astigmatism and distortion at the middle of the zoom lens of embodiment 1, and fig. 4(c) is an aberration diagram of spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens of embodiment 1.
Fig. 5(a) is a sectional view at the wide-angle end of the zoom lens of embodiment 2, fig. 5(b) is a sectional view at the middle of the zoom lens of embodiment 2, and fig. 5(c) is a sectional view at the telephoto end of the zoom lens of embodiment 2.
Fig. 6(a) is an aberration diagram of spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens of embodiment 2, fig. 6(b) is an aberration diagram of spherical aberration, astigmatism and distortion at the middle of the zoom lens of embodiment 2, and fig. 6(c) is an aberration diagram of spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens of embodiment 2.
Fig. 7(a) is a sectional view at the wide-angle end of the zoom lens of embodiment 3, fig. 7(b) is a sectional view of the middle of the zoom lens of embodiment 3, and fig. 7(c) is a sectional view of the telephoto end of the zoom lens of embodiment 3.
Fig. 8(a) is an aberration diagram of spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens of embodiment 3, fig. 8(b) is an aberration diagram of spherical aberration, astigmatism and distortion at the middle of the zoom lens of embodiment 3, and fig. 8(c) is an aberration diagram of spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens of embodiment 3.
Fig. 9(a) is a sectional view at the wide-angle end of the zoom lens of embodiment 4, fig. 9(b) is a sectional view of the middle of the zoom lens of embodiment 4, and fig. 9(c) is a sectional view of the telephoto end of the zoom lens of embodiment 4.
Fig. 10(a) is an aberration diagram of spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens of embodiment 4, fig. 10(b) is an aberration diagram of spherical aberration, astigmatism and distortion at the middle of the zoom lens of embodiment 4, and fig. 10(c) is an aberration diagram of spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens of embodiment 4.
Fig. 11(a) is a sectional view at the wide-angle end of the zoom lens of embodiment 5, fig. 11(b) is a sectional view at the middle of the zoom lens of embodiment 5, and fig. 11(c) is a sectional view at the telephoto end of the zoom lens of embodiment 5.
Fig. 12(a) is an aberration diagram of spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens of embodiment 5, fig. 12(b) is an aberration diagram of spherical aberration, astigmatism and distortion at the middle of the zoom lens of embodiment 5, and fig. 12(c) is an aberration diagram of spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens of embodiment 5.
Detailed Description
An imaging device according to an embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a front perspective view of an imaging device 10 according to the present embodiment, and fig. 2 is a rear perspective view of the imaging device 10 according to the present embodiment.
The imaging device 10 as a digital camera includes a housing 12, and the housing 12 holds a lens barrel 50 accommodating a curved zoom lens (described later in detail) composed of first to fifth lens groups in order from the object side and forms an outer package. As shown in fig. 1 and 2, the frame 12 has a thickness in the front-rear direction, a height in the vertical direction larger than the thickness, and a width in the left-right direction larger than the height, and is formed in a flat thin rectangular plate shape.
As shown in fig. 1, an opening 12a is provided in a portion near the right side portion of the upper portion of the front surface of the housing 12, and a first lens group of a zoom lens described later is provided toward the front through the opening 12 a.
As shown in fig. 2, a display screen 32 is provided on the rear surface of the housing 12, and displays a captured screen (image data), an operation screen for performing various setting operations related to image capturing and playback, a menu screen, and the like. The display unit is constituted by the display screen 32. As the display panel 32, a conventionally known display device such as a liquid crystal display device or an organic EL display device can be used.
A release button 34 and a power switch 36 are provided on the upper surface of the housing 12. The left side portion of the rear surface of the frame 12 is provided with: a zoom operation switch 38 for adjusting a zoom ratio of the imaging lens system to a telephoto side (far side) or a wide angle side (wide side); and a plurality of operation switches 40 for performing various operations such as switching between an image pickup mode and a playback mode, selecting an item from a menu screen displayed on the display 32, and setting a setting item. In fig. 1, reference numeral 44 denotes a strobe light emitting section, reference numeral 46 denotes a memory card, and reference numeral 48 denotes a battery.
The operation of the imaging apparatus of the present embodiment will be described. In fig. 1 and 2, when the zoom operation switch 38 is operated in a state where the power switch 36 is turned on, the second lens group and the third lens group of the zoom lens move in the optical axis direction in a predetermined relationship, and magnification change is realized. Alternatively, focusing is achieved by moving the fourth lens group in the optical axis direction using a known AF image plane function.
When the release button 34 is pressed, subject light incident through the zoom lens enters the image pickup surface of the image pickup device, and is converted into an image signal by a predetermined exposure time specified by the shutter mechanism, and therefore, after predetermined image processing is performed by the processing device, a subject image based on the image signal is displayed on the display screen 32 and is stored in the memory card 46.
The zoom lens is composed of a first lens group having positive power and not moving during zooming, a second lens group having negative power and moving along the optical axis during zooming, a third lens group having positive power and not moving during zooming, a fourth lens group having positive power and moving along the optical axis during zooming, and a fifth lens group not moving during zooming, which are arranged in order from the object side. The first lens group has a reflecting member for bending an optical axis, the fourth lens group is composed of, in order from the object side, a 41 th lens having negative refractive power and a 42 th lens having positive refractive power, and the fifth lens group is composed of, in order from the object side, a 51 st lens having negative refractive power, a 52 th lens having positive refractive power, and a 53 th lens, and the following conditional expressions are satisfied.
-1.50<f2/fw<-1.00 (1)
3.30<f4/fw<4.30 (2)
0.3<|β4T/β4W|<1.0 (3)
Wherein,
f 2: focal length of the second lens group (mm)
f 4: focal length of the fourth lens group (mm)
fw: synthetic focal length (mm) of the entire system at wide-angle end
β 4W: transverse magnification of the fourth lens group at wide angle end
Beta 4T: lateral magnification of telephoto end of fourth lens group
Hereinafter, preferred embodiments of the zoom lens will be described.
Preferably, the first lens group of the zoom lens includes, in order from the object side, an 11 th lens having negative refractive power, the reflecting member, and a 12 th lens having positive refractive power.
The first lens group is composed of, in order from the object side, a lens (11 th lens) having negative refractive power, an optical element (reflecting member) for bending (curving) the optical path, and a lens (12 th lens) having positive refractive power, and therefore, the height of the light beam incident on the reflecting member for bending the optical path can be suppressed low, the reflecting member can be reduced, and particularly, a lens having negative refractive power and a lens group having positive refractive power can be disposed from the object side, so that coma aberration at the wide-angle end can be corrected satisfactorily.
In addition, the following conditional expressions are preferably satisfied.
5<dL1PR/(2Y/fw)<8 (4)
Wherein,
dL1 PR: a distance (mm) from an object-side vertex of the 11 th lens to an object-side-most vertex of the 12 th lens on an optical axis
2Y: imaging face angle length (mm) of solid-state imaging element for forming image by using the zoom lens
The conditional expression (4) specifies a relationship between a distance from an object side surface of a lens located on the object side of the reflecting member to an image side surface of the reflecting member in the first lens group, an image-pickup surface angle length of the solid-state image pickup element, and a focal length of the entire lens system at the wide-angle end. Specifically, when the value of conditional expression (4) exceeds the lower limit, it is possible to suppress the distance from the object side surface of the lens located on the object side of the reflecting member to the image side surface of the reflecting member from becoming excessively small with respect to the angle of view at the wide-angle end, and to easily perform off-axis aberration correction by reducing the effective diameter of the first lens group at the wide-angle end, and to ensure good optical performance. On the other hand, when the value of the conditional expression (4) is lower than the upper limit, it is possible to suppress the thickness dimension of the imaging apparatus from becoming excessively large, and it is possible to ensure compactness, and it is preferable that the following conditional expression is satisfied.
6<dL1PR/(2Y/fw)<7 (4)’
In addition, the following conditional expressions are preferably satisfied.
1.0<f1/(fw×Fnow)<1.5 (5)
f 1: focal length (mm) of the first lens group
Fnow: f number at wide angle end
Conditional expression (5) specifies a relationship of a focal length of the first lens group, a focal length of the entire lens system at the wide-angle end, and an F-number at the wide-angle end. Specifically, when the value of conditional expression (5) exceeds the lower limit, the power of the first lens group does not become too weak with respect to the power of the entire system of lenses at the wide-angle end, and aberration at the wide-angle end can be suppressed, and good optical performance can be ensured. When the value of conditional expression (5) is less than the upper limit, the refractive power of the first lens group does not become excessively strong with respect to the refractive power of the entire lens system at the wide-angle end, and it is possible to suppress the thickness dimension of the image pickup apparatus from becoming excessively large, and it is possible to ensure compactness. Further, the following conditional expressions are preferably satisfied.
1.1<f1/(fw×Fnow)<1.4 (5)’
In addition, the following conditional expressions are preferably satisfied.
2.0<|β2T/β2W|<3.0 (6)
β 2W: a lateral magnification of the second lens group at a wide angle end
Beta 2T: a lateral magnification of a telephoto end of the second lens group
The conditional expression (6) specifies the ratio of the lateral magnification of the second lens group at the wide-angle end of the entire system to the telephoto end of the entire system. When the value of conditional expression (6) is lower than the upper limit, high coking can be ensured and aberration correction can be performed. On the other hand, when the value of conditional expression (6) exceeds the lower limit, a high zoom ratio can be obtained. Further, the following conditional expressions are preferably satisfied.
2.2<|β2T/β2W|<2.7 (6)’
Further, the 52 th lens of the fifth lens group is an image blur correction lens that corrects an image blur on an image surface by moving in a direction perpendicular to an optical axis, and preferably satisfies the following conditional expression.
0.3<(1-β52T)×β53T<0.9 (7)
Wherein,
β 52T: a lateral magnification of a telephoto end of the 52 th lens of the fifth lens group
β 53T: a lateral magnification of a telephoto end of the 53 th lens of the fifth lens group
The image blur can be corrected by moving a lens having positive power (52 th lens) of the fifth lens group in a direction perpendicular to the optical axis. By moving the 52 th lens of the fifth lens group, which does not move in the optical axis direction, in the direction perpendicular to the optical axis during magnification change and focusing, interference between the driving mechanism for shake correction and other driving mechanisms can be eliminated, and therefore further miniaturization can be achieved. Further, since the 52 th lens is a lens having positive refractive power, chromatic aberration of magnification can be suppressed, and thus high optical performance can be ensured.
The conditional expression (7) is a conditional expression that defines how much an image is moved with respect to a unit movement amount of the lens having positive power (the 52 th lens) of the fifth lens group moved at the time of shake correction. Specifically, when the value of conditional expression (7) exceeds the lower limit, the amount of lens movement required to move the image by a predetermined amount does not become excessively large, and therefore, the necessary space can be prevented from becoming excessively large. When the value of conditional expression (7) is lower than the upper limit, the amount of lens movement required to move the image by a certain predetermined amount does not become excessively small, and high accuracy is not required for control of the driving device, so that the cost of the imaging device can be suppressed. Further, the following conditional expressions are preferably satisfied.
0.3<(1-β52T)×β53T<0.8 (7)’
In addition, it is preferable that the 53 th lens of the fifth lens group is formed of plastic. Since the 53 th lens of the fifth lens group is formed of a plastic lens, the 53 th lens can be easily given an aspherical shape, and each aberration can be corrected to ensure high optical performance. In addition, since plastic is inexpensive and lightweight compared to glass, it contributes to cost reduction and weight reduction.
In addition, the following conditional expressions are preferably satisfied.
0.3<|fp/ft| (8)
fp: focal length (mm) of the 53 th lens
ft: synthetic focal length (mm) of the entire system at the telescope end
The conditional expression (8) is a conditional expression that specifies a ratio of the focal length of the 53 th lens to the focal length of the telephoto end of the entire system. Specifically, when the value of conditional expression (8) exceeds the lower limit, the refractive power of the lens does not become excessively strong, the influence of the change in the refractive index due to the temperature change of the plastic does not become excessively large, and the focus shift and the deterioration of the optical performance can be suppressed. Further, the following conditional expressions are preferably satisfied.
0.3<|fp/ft|<10 (8)’
If the refractive power is lower than the upper limit of conditional expression (8)', the refractive power of the lens does not become excessively weak, and the size of the entire imaging optical system can be prevented from becoming excessively large, thereby ensuring compactness.
In addition, the following conditional expressions are preferably satisfied.
1.0<d2wt/d4wt<1.7 (9)
d2 wt: a distance (mm) by which the second lens group moves from a wide-angle end to a telephoto end at the time of varying magnification
d4 wt: a distance (mm) by which the fourth lens group moves from a wide-angle end to a telephoto end at magnification varying
The conditional expression (9) specifies a conditional expression of a ratio of moving amounts of the second lens group and the fourth lens group which move at the time of magnification change. Specifically, when the value of the conditional expression (9) exceeds the lower limit, the moving amount of the second lens group does not become too small compared to the moving amount of the fourth lens group, the magnification-varying effect of the second lens group does not become too small, and even if the fourth lens group is caused to bear the corresponding magnification-varying effect, the effective diameter behind the fourth lens group does not increase too much, so that the thinning of the imaging apparatus can be ensured. In addition, even if the magnification-varying effect of the second lens group is ensured, the power of the second lens group does not become excessively strong, optical performance is easily ensured, and error sensitivity does not become excessively large. On the other hand, when the value of conditional expression (9) is lower than the upper limit, the moving amount of the second lens group does not become too large compared to the moving amount of the fourth lens group, the distance from the stop to the most object side lens of the first lens group does not become too large, and the effective diameter of the first lens can be suppressed from increasing.
Further, it is preferable that a stop be disposed on the object side of the third lens group. By providing the aperture stop on the object side of the lens of the third lens group located at the substantially central portion of the zoom lens, off-axis aberrations can be corrected in a balanced manner, and a large difference is less likely to occur between the front lens diameter (each lens diameter disposed on the object side of the aperture stop) and the rear lens diameter (each lens diameter disposed on the image side of the aperture stop), so that there is an advantage in that the shape of the lens unit in the thickness direction of the image pickup device is easily flattened, and the degree of freedom in the arrangement of the image pickup device is improved.
In addition, it is preferable that the 41 th lens and the 42 th lens of the fourth lens group are cemented lenses. By joining the 41 th lens and the 42 th lens, the group member is suppressed to one, and it is possible to make the zoom lens easier in production management than when all the lenses of the fourth lens group are single-lensed. In addition, the distance of the entire imaging optical system can be shortened. Further, in the case of not a cemented lens, since the degree of freedom of the optical surface is increased as compared with the case of a cemented lens, aberration can be corrected well.
Further, it is preferable that focusing is performed by moving the fourth lens group along the optical axis. By focusing with the fourth lens group, it is possible to obtain a clear image by performing appropriate focusing up to a close object without causing an increase in the total optical length of the projection and an increase in the diameter of the front lens.
In addition, the zoom lens may have a lens having substantially no optical power.
Hereinafter, an embodiment of a zoom lens that can be used in the image pickup apparatus 10 of fig. 1 is shown, but the present invention is not limited thereto. Symbols used in the respective examples are as follows. In the lens data described later, the unit indicating the length is mm.
f: focal length of zoom lens whole system (mm)
Fno: f number
R: radius of curvature (mm)
D: spacing above the shaft (mm)
nd: refractive index of lens material with respect to d-line
V d: abbe number of d-line of lens material
2Y: diagonal line (mm) of image pickup surface of solid-state image pickup element
In each embodiment, a surface denoted by "", after each surface number, is a surface having an aspherical shape, and the aspherical shape is represented by "equation 1" below, with the vertex of the surface as the origin, the optical axis direction as the X axis, and the height in the direction perpendicular to the optical axis as h.
[ mathematical formula 1 ]
Wherein,
ai: i-th order aspherical surface coefficient
R: radius of curvature
K: constant of cone
In addition, E (e.g., 2.5E-02) is used hereinafter (including the lens data in the table) to represent a power of 10 (e.g., 2.5 × 10)-02)。
(example 1)
Lens data of the zoom lens of embodiment 1 is shown in table 1. Fig. 3(a) is a sectional view of the zoom lens according to embodiment l at the wide-angle end, fig. 3(b) is a sectional view of the zoom lens according to embodiment 1 at the middle, and fig. 3(c) is a sectional view of the zoom lens according to embodiment 1 at the telephoto end. Fig. 4(a) is an aberration diagram showing spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens according to embodiment 1, fig. 4(b) is an aberration diagram showing spherical aberration, astigmatism and distortion at the middle of the zoom lens according to embodiment 1, and fig. 4(c) is an aberration diagram showing spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens according to embodiment 1. In the aberration diagrams hereinafter, the solid line represents the d-line and the broken line represents the g-line in the spherical aberration diagram, the solid line represents the arc-off image plane and the broken line represents the meridional image plane in the astigmatism diagram.
[ TABLE 1 ]
Example 1
f is 4.43-9.66-21.06[ Wide angle, middle and telescope ]
Fno 2.88-4.50-5.05[ wide angle, middle, telescope ]
Zoom ratio of 4.75
Coefficient of aspheric surface
Focal length, F number, and inter-group distance at each position
Lens group data
The zoom lens of embodiment 1 is composed of, in order from the object side along the optical axis, a first lens group Gr1 having positive power which does not move when varying magnification, a second lens group Gr2 having negative power which moves along the optical axis when varying magnification, a third lens group Gr3 having positive power which includes a stop S and does not move when varying magnification, a fourth lens group Gr4 having positive power which moves along the optical axis when varying magnification, and a fifth lens group Gr5 which does not move when varying magnification. An infrared cut filter F having an infrared cut coating on its optical surface and a seal glass CG covering the imaging surface IM of the solid-state imaging element are disposed between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging element.
The first lens group Gr1 is composed of, in order from the object side, an 11 th lens L11 having negative refractive power, a prism ML as a reflecting member for bending the optical axis, and a 12 th lens L12 having positive refractive power. The second lens group Gr2 is composed of, in order from the object side, a 21 st lens L21 having positive refractive power, a 22 nd lens L22 having negative refractive power, and a 23 rd lens L23 having positive refractive power. The 22 nd lens L22 and the 23 rd lens L23 are cemented lenses cemented to each other. The third lens group Gr3 is composed of, in order from the object side, a stop S and a 31 st lens L31 having positive refractive power. The fourth lens group Gr4 is composed of, in order from the object side, a 41 th lens L41 having negative refractive power, and a 42 th lens L42 having positive refractive power. The 41 st lens L41 and the 42 th lens L42 are cemented lenses cemented to each other. The fifth lens group Gr5 is composed of, in order from the object side, a 51 st lens L51 having negative refractive power, a 52 nd lens L52 having positive refractive power, and a 53 th lens L53. In addition, at the time of focusing, the fourth lens group Gr4 moves in the optical axis direction. Also, at the time of shake correction, the 52 nd lens L52 of the fifth lens group Gr5 moves in a direction perpendicular to the optical axis. The 53 th lens L53 is formed of plastic.
(example 2)
Lens data of the zoom lens of embodiment 2 is shown in table 2. Fig. 5(a) is a sectional view at the wide-angle end of the zoom lens according to embodiment 2, fig. 5(b) is a sectional view at the middle of the zoom lens according to embodiment 2, and fig. 5(c) is a sectional view at the telephoto end of the zoom lens according to embodiment 2. Fig. 6(a) is an aberration diagram showing spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens according to embodiment 2, fig. 6(b) is an aberration diagram showing spherical aberration, astigmatism and distortion at the middle of the zoom lens according to embodiment 2, and fig. 6(c) is an aberration diagram showing spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens according to embodiment 2.
[ TABLE 2 ]
Example 2
f is 4.43-9.65-21.05[ wide angle, middle and telescope ]
Fno 2.88-4.46-5.17[ wide angle, middle, telescope ]
Zoom ratio of 4.75
Coefficient of aspheric surface
Focal length, F number, and inter-group distance at each position
Lens group data
The zoom lens of embodiment 2 is composed of, in order from the object side along the optical axis, a first lens group Gr1 having positive power which does not move when varying magnification, a second lens group Gr2 having negative power which moves along the optical axis when varying magnification, a third lens group Gr3 having positive power which includes a stop S and does not move when varying magnification, a fourth lens group Gr4 having positive power which moves along the optical axis when varying magnification, and a fifth lens group Gr5 which does not move when varying magnification. An infrared cut filter F having an infrared cut coating on its optical surface and a seal glass CG covering the imaging surface IM of the solid-state imaging element are disposed between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging element.
The first lens group Gr1 is composed of, in order from the object side, an 11 th lens L11 having negative refractive power, a prism ML as a reflecting member for bending the optical axis, and a 12 th lens L12 having positive refractive power. The second lens group Gr2 is composed of, in order from the object side, a 21 st lens L21 having positive refractive power, a 22 nd lens L22 having negative refractive power, and a 23 rd lens L23 having positive refractive power. The 22 nd lens L22 and the 23 rd lens L23 are cemented lenses cemented to each other. The third lens group Gr3 is composed of, in order from the object side, a stop S and a 31 st lens L31 having positive refractive power. The fourth lens group Gr4 is composed of, in order from the object side, a 41 th lens L41 having negative refractive power, and a 42 th lens L42 having positive refractive power. The 41 st lens L41 and the 42 th lens L42 are cemented lenses cemented to each other. The fifth lens group Gr5 is composed of, in order from the object side, a 51 st lens L51 having negative refractive power, a 52 nd lens L52 having positive refractive power, and a 53 th lens L53. In addition, at the time of focusing, the fourth lens group Gr4 moves in the optical axis direction. Also, at the time of shake correction, the 52 nd lens L52 of the fifth lens group Gr5 moves in a direction perpendicular to the optical axis. The 53 th lens L53 is formed of plastic.
(example 3)
Lens data of the zoom lens of embodiment 3 is shown in table 3. Fig. 7(a) is a sectional view at the wide-angle end of the zoom lens according to embodiment 3, fig. 7(b) is a sectional view at the middle of the zoom lens according to embodiment 3, and fig. 7(c) is a sectional view at the telephoto end of the zoom lens according to embodiment 3. Fig. 8(a) is an aberration diagram showing spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens according to embodiment 3, fig. 8(b) is an aberration diagram showing spherical aberration, astigmatism and distortion at the middle of the zoom lens according to embodiment 3, and fig. 8(c) is an aberration diagram showing spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens according to embodiment 3.
[ TABLE 3 ]
Example 3
f is 4.42-9.66-20.98[ Wide angle, middle and telescope ]
Fno 2.88-4.49-5.01[ wide angle, middle, telescope ]
Zoom ratio of 4.75
Coefficient of aspheric surface
Focal length, F number, and inter-group distance at each position
Lens group data
The zoom lens of embodiment 3 is composed of, in order from the object side along the optical axis, a first lens group Gr1 having positive power which does not move when varying magnification, a second lens group Gr2 having negative power which moves along the optical axis when varying magnification, a third lens group Gr3 having positive power which includes a stop S and does not move when varying magnification, a fourth lens group Gr4 having positive power which moves along the optical axis when varying magnification, and a fifth lens group Gr5 which does not move when varying magnification. An infrared cut filter F having an infrared cut coating on its optical surface and a seal glass CG covering the imaging surface IM of the solid-state imaging element are disposed between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging element.
The first lens group Gr1 is composed of, in order from the object side, an 11 th lens L11 having negative refractive power, a prism ML as a reflecting member for bending the optical axis, and a 12 th lens L12 having positive refractive power. The second lens group Gr2 is composed of, in order from the object side, a 21 st lens L21 having positive refractive power, a 22 nd lens L22 having negative refractive power, and a 23 rd lens L23 having positive refractive power. The 22 nd lens L22 and the 23 rd lens L23 are cemented lenses cemented to each other. The third lens group Gr3 is composed of, in order from the object side, a stop S and a 31 st lens L31 having positive refractive power. The fourth lens group Gr4 is composed of, in order from the object side, a 41 th lens L41 having negative refractive power, and a 42 th lens L42 having positive refractive power. The fifth lens group Gr5 is composed of, in order from the object side, a 51 st lens L51 having negative refractive power, a 52 nd lens L52 having positive refractive power, and a 53 th lens L53. In addition, at the time of focusing, the fourth lens group Gr4 moves in the optical axis direction. Also, at the time of shake correction, the 52 nd lens L52 of the fifth lens group Gr5 moves in a direction perpendicular to the optical axis. The 53 th lens L53 is formed of plastic.
(example 4)
Lens data of the zoom lens of embodiment 4 is shown in table 4. Fig. 9(a) is a sectional view at the wide-angle end of the zoom lens according to embodiment 4, fig. 9(b) is a sectional view at the middle of the zoom lens according to embodiment 4, and fig. 9(c) is a sectional view at the telephoto end of the zoom lens according to embodiment 4. Fig. 10(a) is an aberration diagram showing spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens according to embodiment 4, fig. 10(b) is an aberration diagram showing spherical aberration, astigmatism and distortion at the middle of the zoom lens according to embodiment 4, and fig. 10(c) is an aberration diagram showing spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens according to embodiment 4.
[ TABLE 4 ]
Example 4
f is 4.43-9.57-21.05[ Wide angle, middle and telescope ]
Fno 2.88-4.54-5.07[ wide angle, middle, telescope ]
Zoom ratio of 4.75
Coefficient of aspheric surface
Focal length, F number, and inter-group distance at each position
Lens group data
The zoom lens of embodiment 4 is composed of, in order from the object side along the optical axis, a first lens group Gr1 having positive power which does not move when varying magnification, a second lens group Gr2 having negative power which moves along the optical axis when varying magnification, a third lens group Gr3 having positive power which includes a stop S and does not move when varying magnification, a fourth lens group Gr4 having positive power which moves along the optical axis when varying magnification, and a fifth lens group Gr5 which does not move when varying magnification. An infrared cut filter F having an infrared cut coating on its optical surface and a seal glass CG covering the imaging surface IM of the solid-state imaging element are disposed between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging element.
The first lens group Gr1 is composed of, in order from the object side, an 11 th lens L11 having negative refractive power, a prism ML serving as a reflecting member for bending the optical axis, and a 12 th lens L12 having positive refractive power. The second lens group Gr2 is composed of, in order from the object side, a 21 st lens L21 having positive refractive power, a 22 nd lens L22 having negative refractive power, and a 23 rd lens L23 having positive refractive power. The 22 nd lens L22 and the 23 rd lens L23 are cemented lenses cemented to each other. The third lens group Gr3 is composed of, in order from the object side, a stop S and a 31 st lens L31 having positive refractive power. The fourth lens group Gr4 is composed of, in order from the object side, a 41 th lens L41 having negative refractive power, and a 42 th lens L42 having positive refractive power. The 41 st lens L41 and the 42 th lens L42 are cemented lenses cemented to each other. The fifth lens group Gr5 is composed of, in order from the object side, a 51 st lens L51 having negative refractive power, a 52 nd lens L52 having positive refractive power, and a 53 th lens L53. In addition, at the time of focusing, the fourth lens group Gr4 moves in the optical axis direction. Also, at the time of shake correction, the 52 nd lens L52 of the fifth lens group Gr5 is displaced in the direction perpendicular to the optical axis. The 53 th lens L53 is formed of plastic.
(example 5)
Lens data of the zoom lens of embodiment 5 is shown in table 5. Fig. 11(a) is a sectional view at the wide-angle end of the zoom lens according to embodiment 5, fig. 11(b) is a sectional view at the middle of the zoom lens according to embodiment 5, and fig. 11(c) is a sectional view at the telephoto end of the zoom lens according to embodiment 5. Fig. 12(a) is an aberration diagram showing spherical aberration, astigmatism and distortion at the wide angle end of the zoom lens according to embodiment 5, fig. 12(b) is an aberration diagram showing spherical aberration, astigmatism and distortion at the middle of the zoom lens according to embodiment 5, and fig. 12(c) is an aberration diagram showing spherical aberration, astigmatism and distortion at the telephoto end of the zoom lens according to embodiment 5.
[ TABLE 5 ]
Example 5
f is 4.43-9.66-21.03[ Wide angle, middle and telescope ]
Fno 2.88-4.37-5.07[ wide angle, middle, telescope ]
Zoom ratio of 4.75
Coefficient of aspheric surface
Focal length, F number, and inter-group distance at each position
Lens group data
The zoom lens of embodiment 5 is composed of, in order from the object side along the optical axis, a first lens group Gr1 having positive power which does not move when varying magnification, a second lens group Gr2 having negative power which moves along the optical axis when varying magnification, a third lens group Gr3 having positive power which includes a stop S and does not move when varying magnification, a fourth lens group Gr4 having positive power which moves along the optical axis when varying magnification, and a fifth lens group Gr5 which does not move when varying magnification. An infrared cut filter F having an infrared cut coating on its optical surface and a seal glass CG covering the imaging surface IM of the solid-state imaging element are disposed between the fifth lens group Gr5 and the imaging surface IM of the solid-state imaging element.
The first lens group Gr1 is composed of, in order from the object side, an 11 th lens L11 having negative refractive power, a prism ML as a reflecting member for bending the optical axis, and a 12 th lens L12 having positive refractive power. The second lens group Gr2 is composed of, in order from the object side, a 21 st lens L21 having positive refractive power, a 22 nd lens L22 having negative refractive power, and a 23 rd lens L23 having positive refractive power. The 22 nd lens L22 and the 23 rd lens L23 are cemented lenses cemented to each other. The third lens group Gr3 is composed of, in order from the object side, a stop S and a 31 st lens L31 having positive refractive power. The fourth lens group Gr4 is composed of, in order from the object side, a 41 th lens L41 having negative refractive power, and a 42 th lens L42 having positive refractive power. The 41 st lens L41 and the 42 th lens L42 are cemented lenses cemented to each other. The fifth lens group Gr5 is composed of, in order from the object side, a 51 st lens L51 having negative refractive power, a 52 nd lens L52 having positive refractive power, and a 53 th lens L53. In addition, at the time of focusing, the fourth lens group Gr4 moves in the optical axis direction. Also, at the time of shake correction, the 52 nd lens L52 of the fifth lens group Gr5 moves in a direction perpendicular to the optical axis. The 53 th lens L53 is formed of plastic.
The expressions corresponding to the above-described examples and the respective numerical values used for calculating the respective expressions are summarized in tables 6 and 7.
[ TABLE 6 ]
[ TABLE 7 ]
The present invention is not limited to the embodiments or examples described in the present specification, and other embodiments and modifications will be apparent to those skilled in the art from the embodiments, examples, or technical ideas described in the present specification. For example, a case where a dummy lens having substantially no optical power is further mounted is also within the applicable range of the present invention.
Description of the reference numerals
10 image pickup device
12 frame body
12a opening
32 display screen
34 Release button
36 power switch
38 zoom operation switch
40 operating switch
50 lens cone
F infrared ray cut-off filter
Grl-Gr 5 lens group
ML prism (reflection parts)
S aperture
CG sealing glass
Image pickup surface of IM solid-state image pickup element
Claims (15)
1. A zoom lens comprising, arranged in order from an object side, a first lens group having positive power and not moving during magnification variation, a second lens group having negative power and moving along an optical axis during magnification variation, a third lens group having positive power and not moving during magnification variation, a fourth lens group having positive power and moving along the optical axis during magnification variation, and a fifth lens group not moving during magnification variation,
the zoom lens is characterized in that the zoom lens,
the first lens group has a reflecting member for bending an optical axis,
the fourth lens group is composed of, in order from the object side, a 41 th lens having negative refractive power and a 42 th lens having positive refractive power,
the fifth lens group is composed of a 51 st lens with negative focal power, a 52 nd lens with positive focal power, and a 53 rd lens in order from the object side, wherein the 53 th lens has positive focal power or negative focal power,
the zoom lens satisfies the following conditional expression:
-1.50<f2/fw<-1.00 (1)
3.30<f4/fw<4.30 (2)
0.3<|β4T/β4W|<1.0 (3)
wherein,
f 2: focal length (mm) of the second lens group
f 4: focal length (mm) of the fourth lens group
fw: synthetic focal length (mm) of the entire system at wide-angle end
β 4W: a lateral magnification of a wide-angle end of the fourth lens group
Beta 4T: a lateral magnification of a telephoto end of the fourth lens group.
2. The zoom lens according to claim 1,
the first lens group is composed of, in order from the object side, an 11 th lens having negative refractive power, the reflecting member, and a 12 th lens having positive refractive power.
3. The zoom lens according to claim 2, wherein the following conditional expression is satisfied:
5<dL1PR/(2Y/fw)<8 (4)
wherein,
dL1 PR: a distance (mm) from an object-side vertex of the 11 th lens to an object-side-most vertex of the 12 th lens on an optical axis
2Y: an imaging face angle of the solid-state imaging element for forming an image with the zoom lens is long (mm).
4. The zoom lens according to claim 1, wherein the following conditional expression is satisfied:
1.0<f1/(fw×Fnow)<1.5 (5)
f 1: focal length (mm) of the first lens group
Fnow: f number at wide end.
5. The zoom lens according to claim 1, wherein the following conditional expression is satisfied:
2.0<|β2T/β2W|<3.0 (6)
β 2W: a lateral magnification of the second lens group at a wide angle end
Beta 2T: a lateral magnification of a telephoto end of the second lens group.
6. The zoom lens according to claim 1,
the 52 th lens of the fifth lens group is an image blur correction lens that corrects an image blur on an image plane by moving to a direction perpendicular to an optical axis, and satisfies the following conditional expression:
0.3<(1-β52T)×β53T<0.9 (7)
wherein,
β 52T: a lateral magnification of a telephoto end of the 52 th lens of the fifth lens group
β 53T: a lateral magnification of a telephoto end of the 53 th lens of the fifth lens group.
7. The zoom lens according to claim l,
the 53 th lens of the fifth lens group is formed of plastic.
8. The zoom lens according to claim 1, wherein the following conditional expression is satisfied:
0.3<|fp/ft| (8)
fp: focal length (mm) of the 53 th lens
ft: the resultant focal length (mm) of the entire system at the telephoto end.
9. The zoom lens according to claim 1, wherein the following conditional expression is satisfied:
1.0<d2wt/d4wt<1.7 (9)
d2 wt: a distance (mm) by which the second lens group moves from a wide-angle end to a telephoto end at the time of varying magnification
d4 wt: a distance (mm) by which the fourth lens group moves from a wide-angle end to a telephoto end at the time of varying magnification.
10. The zoom lens according to claim 1,
a diaphragm is disposed on the object side of the third lens group.
11. The zoom lens according to claim 1,
the 41 th lens and the 42 th lens of the fourth lens group are cemented lenses.
12. The zoom lens according to claim 1,
focusing is performed by moving the fourth lens group along an optical axis.
13. The zoom lens according to claim 1,
the zoom lens has a lens having substantially no optical power.
14. A lens unit is characterized in that a lens unit is provided,
mounting the zoom lens according to any one of claims 1 to 13 on a lens barrel that holds the zoom lens.
15. An imaging device having the zoom lens according to any one of claims 1 to 13 mounted thereon; a lens barrel holding the zoom lens; and a solid-state imaging element that photoelectrically converts an image formed by the zoom lens.
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| JP2013-252797 | 2013-12-06 | ||
| JP2013252797A JP6323742B2 (en) | 2013-12-06 | 2013-12-06 | Zoom lens, lens unit, and imaging apparatus |
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| JP6685950B2 (en) * | 2017-02-17 | 2020-04-22 | 富士フイルム株式会社 | Zoom lens and imaging device |
| JP2022013958A (en) * | 2018-11-01 | 2022-01-19 | 株式会社ニコン | Relay optical system and telescope having relay optical system |
| JP7433875B2 (en) * | 2019-12-11 | 2024-02-20 | キヤノン株式会社 | Optical system and imaging device |
| CN111897115B (en) * | 2020-07-31 | 2021-07-27 | 中国科学院西安光学精密机械研究所 | Continuous zooming optical system with heat dissipation and wide pressure adaptability |
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| JP3288422B2 (en) * | 1992-04-14 | 2002-06-04 | オリンパス光学工業株式会社 | High zoom lens |
| JP2008083125A (en) * | 2006-09-26 | 2008-04-10 | Olympus Imaging Corp | Zoom lens and imaging apparatus using the same |
| JP4352347B2 (en) * | 2007-08-22 | 2009-10-28 | ソニー株式会社 | Zoom lens and imaging device |
| JP2010008679A (en) * | 2008-06-26 | 2010-01-14 | Sony Corp | Zoom lens and imaging apparatus |
| JPWO2012090757A1 (en) * | 2010-12-27 | 2014-06-05 | コニカミノルタ株式会社 | Zoom lens and imaging device |
| JP2013044757A (en) * | 2011-08-19 | 2013-03-04 | Konica Minolta Advanced Layers Inc | Zoom lens and imaging apparatus |
| JP6153310B2 (en) * | 2012-10-30 | 2017-06-28 | キヤノン株式会社 | Zoom lens and imaging apparatus having the same |
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| JP2015111185A (en) | 2015-06-18 |
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