CN105209951B - Zoom lens and camera device - Google Patents
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- CN105209951B CN105209951B CN201380071334.1A CN201380071334A CN105209951B CN 105209951 B CN105209951 B CN 105209951B CN 201380071334 A CN201380071334 A CN 201380071334A CN 105209951 B CN105209951 B CN 105209951B
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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
- G02B15/145—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only
- G02B15/1451—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive
- G02B15/145121—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective having five groups only the first group being positive arranged +-+-+
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Abstract
There is provided and be adapted to digital camera, video camera etc., compact and zoom lens and camera device with high zoom ratio.In the zoom lens with 5 lens groups, following conditional is met.(T2+T3)/fW<2.58(1)fT/fW>16.7 wherein, T2：To thickness (mm) T3 on the optical axis near the lens face of image side from the lens face near object side of the 2nd lens group：To thickness (mm) fW on the optical axis near the lens face of image side from the lens face near object side of the 3rd lens group：Focal length (mm) fT of the wide-angle side of zoom lens：The focal length (mm) of the telescope end of zoom lens.
Description
Technical Field
The present invention relates to a zoom lens that is used in a digital camera, a video camera, or the like and is small and highly variable.
Background
In recent years, high integration and miniaturization of imaging elements such as CCD (Charge Coupled Device) type image sensors and CMOS (Complementary Metal Oxide Semiconductor) type image sensors have been achieved, and along with this, in imaging devices such as digital cameras and video cameras using CCDs or CMOSs, high functionality and miniaturization of the entire Device have been demanded.
In addition, the use of digital cameras and the like has been expanding along with their widespread use. Therefore, digital cameras and the like are required to be further improved in portability, that is, to be smaller and lighter in weight, and therefore zoom lenses mounted thereon are also required to be further smaller in size. Further, from the viewpoint of enlarging the imaging area, zoom lenses having a zoom ratio exceeding 10 times have become widespread, and further high zoom ratio is expected.
As such a high-magnification and compact zoom lens, there is known a 5-group type zoom lens in which positive, negative, positive and positive lenses (which means a configuration in which a lens having positive refractive power, a lens having negative refractive power, and a lens having positive refractive power are arranged in this order from the object side, and the same applies hereinafter) (see patent documents below).
Documents of the prior art
Patent document
Patent document l: japanese unexamined patent publication No. 2011-186417
Patent document 1: japanese unexamined patent publication No. 2012 and 008601
Patent document 2: japanese unexamined patent publication No. 2012-048199
Patent document 3: japanese unexamined patent publication No. 2012-247564
Disclosure of Invention
Problems to be solved by the invention
However, according to the zoom lens of patent document 1, although a high magnification ratio of 10 times or more can be obtained, the number of lenses is increased to obtain good optical performance, which leads to high cost.
Next, according to the zoom lens of patent document 2, as with the zoom lens of patent document 1, a high magnification ratio of 10 times or more can be obtained, but since the number of lenses is large and the diaphragm is movable, the driving mechanism becomes complicated and large. Further, since 2-group and 3-group lenses are comparatively thick in the optical axis direction, it is difficult to say that they are compact zoom lenses. On the other hand, if the 2-group or 3-group lenses are made thin, optical characteristics such as aberrations tend to deteriorate, but if the characteristics are corrected appropriately, the number of lenses increases, and thus the 2-group or 3-group lenses may become thick.
On the other hand, according to the zoom lens of patent document 3, although it is possible to achieve high magnification of about 15 times or more and downsizing, the number of lenses is large as in patent document 1, which leads to high cost. Further, since 2-group and 3-group lenses are comparatively thick in the optical axis direction, it is difficult to say that they are compact zoom lenses, and if the zoom lens is collapsed in a state of being mounted on a digital camera or the like, the thickness at the time of collapsing also increases, and miniaturization is impaired.
Further, according to the zoom lens of patent document 4, although high magnification of about 15 times or more can be achieved and the size can be reduced, in order to ensure good optical performance, the thickness of 2-group and 3-group lenses is increased, and therefore, it is difficult to say that the zoom lens is compact, and in the case of a retractable zoom lens, the thickness at the time of retraction is also increased.
The present invention has been made in view of the above problems, and an object thereof is to provide a compact zoom lens and an imaging device having a high zoom ratio suitable for a digital camera, a video camera, or the like.
Means for solving the problems
The zoom lens according to claim 1 is a zoom lens which is constituted by, in order from an object side to an image side, a 1 st lens group having positive refractive power, a 2 nd lens group having negative refractive power, a 3 rd lens group having a stop and positive refractive power, a 4 th lens group having negative refractive power, and a 5 th lens group having positive refractive power, and which is variable in magnification by changing an interval between the lens groups, and is characterized by satisfying the following conditional expression.
(T2+T3)/fW<2.58 (1)
fT/fW>16.7
Wherein,
t2: a thickness (mm) on an optical axis from a lens surface closest to an object side to a lens surface closest to an image side of the 2 nd lens group
T3: a thickness (mm) on an optical axis from a lens surface closest to an object side to a lens surface closest to an image side of the 3 rd lens group
f, w: focal length (mm) at wide angle end of the zoom lens
And f, fT: focal length (mm) of telescope end of the zoom lens
The zoom lens is configured by a 1 st lens group having positive refractive power, a 2 nd lens group having negative refractive power, a 3 rd lens group having positive refractive power, a 4 th lens group having negative refractive power, and a 5 th lens group having positive refractive power in order from the object side to the image side. Further, by moving each lens group in the optical axis direction to perform magnification change and focal position change correction by changing the air space between the lens groups, the degree of freedom of aberration correction is increased, and the total length and the foremost lens diameter can be made compact and high magnification change can be ensured while maintaining good optical performance.
Further, since the 3 rd lens group has a stop, the exit pupil position can be separated from the image pickup device, so that telecentricity required in the case where the image pickup device is a CCD or a CMOS can be easily ensured, and the entrance pupil position can be positioned further to the object side, so that the frontmost lens diameter and the rearmost lens diameter can be reduced in size.
Here, in a high magnification-varying zoom lens having a magnification ratio fT/fW of 16.7 or more, if the value of conditional expression (1) becomes larger than the upper limit, the total thickness of the 2 nd lens group and the 3 rd lens group becomes large, and the effective diameter and the total length of the zoom lens also become large. Further, if the total thickness becomes large, the lens becomes heavy, and the mechanism for moving the lens becomes complicated and large. According to the present invention, the zoom lens can be downsized by designing to satisfy the conditional expression (1). It is more preferable that the following expression is satisfied. When the value of conditional expression (1') is higher than the lower limit, it is advantageous to ensure favorable optical characteristics such as aberration. Further, when the value of conditional expression (1') is lower than the upper limit, a zoom lens having a smaller size can be provided.
1.8<(T2+T3)/fW<2.58 (1’)
The zoom lens according to claim 2 is the zoom lens according to claim 1, wherein the following conditional expression is satisfied.
1.0<(β2t/β2w)/(β3t/β3w)<3.0 (2)
Wherein,
β 2 t: lateral magnification of a telephoto end of the 2 nd lens group
β 2 w: transverse magnification of the 2 nd lens group at wide angle end
β 3 t: lateral magnification of the telephoto end of the 3 rd lens group
β 3 w: transverse magnification of the wide-angle end of the 3 rd lens group
When the value of conditional expression (2) is lower than the upper limit, the lateral magnification ratio of the 2 nd lens group does not become too large, and the magnification-varying action by the 2 nd lens group does not become too large. Therefore, since the moving amount of the 2 nd lens group can be suppressed, the zoom lens can be downsized, or the power (パワー) of the 2 nd lens group can be made not excessively strong, and thus it becomes easy to correct aberration generated in the 2 nd lens group. When the value of conditional expression (2) is higher than the lower limit, the lateral magnification ratio of the 2 nd lens group does not become too small, and the magnification variation effect by the 3 rd lens group does not become too large. Therefore, the amount of movement of the 3 rd lens group can be suppressed, so the zoom lens can be downsized, or the power of the 3 rd lens group can be made not excessively strong, and thus it becomes easy to correct aberration generated in the 3 rd lens group. That is, satisfying conditional expression (2) allows the magnification-varying action at the time of obtaining a high magnification variation to be shared between the 2 nd lens group and the 3 rd lens group, and thus, securing of good optical performance and downsizing of the zoom lens become possible. It is more preferable that the following expression is satisfied.
1.1<(β2t/β2w)/(β3t/β3w)<2.8 (2’)
The zoom lens according to claim 3 is the zoom lens according to claim 1 or 2, characterized in that the following conditional expression is satisfied.
0.4<|f2/f3|<0.8 (3)
f 2: focal length (mm) of the 2 nd lens group
f 3: focal length (mm) of the 3 rd lens group
When the value of conditional expression (3) is lower than the upper limit, the power of the 2 nd lens group is not excessively weak, and it is not necessary to increase the moving amount of the 2 nd lens group to ensure magnification variation, and the entire zoom lens can be downsized. When the value of conditional expression (3) is higher than the lower limit, the power of the 2 nd lens group is not excessively strong, and each aberration such as coma aberration, astigmatism, and field curvature is favorable, so that excellent optical performance can be ensured. When the 2 nd lens group is assembled to the lens barrel, aberration variation, which is decentering error of the lens group, is not excessively large, and mass productivity is improved. That is, by satisfying the conditional expression (3), it is possible to improve mass productivity while ensuring miniaturization and good performance of the effective diameter and the entire length. It is more preferable that the following expression is satisfied.
0.55<|f2/f3|<0.75 (3’)
The zoom lens according to claim 4 is the zoom lens according to any one of claims 1 to 3, characterized in that the following conditional expression is satisfied.
Wherein,
f 1: focal length (mm) of the 1 st lens group
The value of conditional expression (4) is lower than the upper limit, the power of the 1 st lens group is not excessively weak, and the effective diameter and the total length of the zoom lens can be reduced. On the other hand, when the value of conditional expression (4) is higher than the lower limit, the power of the 1 st lens group is not excessively strong, and coma aberration, astigmatism, field curvature, chromatic aberration of magnification, spherical aberration generated at the telephoto end, and chromatic aberration on the axis, which are mainly generated at the wide-angle end, can be corrected satisfactorily. That is, satisfying conditional expression (4) ensures miniaturization and good optical performance of the zoom lens. Further, it is more preferable if the following expression is satisfied.
The zoom lens according to claim 5 is the invention according to any one of claims 1 to 4, wherein the following conditional expression is satisfied.
Wherein,
t1: a thickness (mm) on an optical axis from a lens surface closest to an object side to a lens surface closest to an image side of the 1 st lens group,
by the value of conditional expression (5) being lower than the upper limit, the total thickness of the 1 st lens group is not excessively large, and the effective diameter and the total length of the zoom lens can be reduced. In addition, since the total thickness of the 1 st lens group is not excessively large, complication and enlargement of a mechanism for driving the 1 st lens group can be avoided. On the other hand, when the value of conditional expression (5) is higher than the lower limit, the edge thickness of each lens can be secured, and the processing becomes easy. That is, by satisfying the conditional expression (5), the zoom lens can be downsized and excellent productivity can be ensured. Further, it is more preferable if the following expression is satisfied.
The zoom lens according to claim 6 is the invention according to any one of claims 1 to 5, wherein the following conditional expression is satisfied.
When the value of conditional expression (6) is lower than the upper limit, the total thickness of the 3 rd lens group is not excessively large, and the total length of the zoom lens can be shortened. In addition, since the total thickness of the 3 rd lens group is not excessively large, complication and enlargement of a mechanism for driving the 3 rd lens group can be avoided. On the other hand, when the value of conditional expression (6) is higher than the lower limit, the edge thickness of each lens can be secured, and the processing becomes easy. That is, with conditional expression (6), the zoom lens can be downsized and good productivity can be ensured. It is more preferable that the following expression is satisfied.
The zoom lens according to claim 7 is the invention according to any one of claims 1 to 6, wherein at least one lens of each of the 1 st lens group, the 2 nd lens group, and the 3 rd lens group, the at least 2 lens groups, satisfies the following conditional expression.
nd>1.9 (7)
Wherein,
nd: refractive index of lens included in each group to d-line
When at least one lens of each group of at least 2 lens groups out of the 1 st lens group, the 2 nd lens group, and the 3 rd lens group satisfies the conditional expression (7), the power of each group including such a lens can be easily increased, and the amount of movement of each group can be reduced, so that the entire zoom lens can be downsized. Further, by using a lens satisfying the conditional expression (7), the radius of curvature of the lens can be made small, and thus occurrence of each aberration can be suppressed, and good optical performance can be ensured. Further, the curvature radius is reduced, thereby suppressing aberration variation with respect to an eccentricity error when the lens barrel is assembled. Further, by using the lens satisfying the conditional expression (7), the zoom lens can be downsized and have excellent optical performance, and the mass productivity can be improved.
The zoom lens according to claim 8, according to the invention recited in any one of claims 1 to 7, wherein the 3 rd lens group includes a cemented lens of a positive lens and a negative lens, at least one positive lens of the cemented lens is included, and the 3 rd lens group satisfies the following conditional expression.
νd3p-νd3n>27 (8)
Wherein,
vd 3 p: abbe number of positive lens of cemented lens included in the 3 rd lens group
Vd 3 n: abbe number of negative lens of cemented lens included in the 3 rd lens group
By including a cemented lens of a positive lens and a negative lens in the 3 rd lens group, and at least one or more positive lenses among the cemented lenses, chromatic aberration on the axis generated in the 3 rd lens group can be corrected well. Further, by using the cemented lens, it is possible to reduce the lens interval error and eccentricity error factor when assembling the lens barrel, and to improve productivity, as compared with the case where the positive lens and the negative lens are arranged one by one. In addition, by the value of conditional expression (8) exceeding the lower limit, chromatic aberration on the axis generated in the 3 rd lens group can be corrected well. Specifically, since chromatic aberration on the axis in which the g-line is located further on the (オーバー) side can be ensured, good optical performance can be ensured. It is more preferable that the following expression is satisfied.
νd3p-νd3n>45 (8’)
The zoom lens according to claim 9 is the invention according to any one of claims 1 to 8, wherein the 3 rd lens group is composed of, in order from the object side, a stop, a positive lens, a junction lens of a positive lens and a negative lens, and a positive lens.
By configuring the 3 rd lens group with a stop, a positive lens, a cemented lens of a positive lens and a negative lens, and a positive lens from the object side, various aberrations such as spherical aberration, coma aberration, astigmatism, and the like can be corrected, and excellent optical performance can be ensured. Further, since the exit pupil position can be separated from the image pickup device by positioning the stop on the most object side of the 3 rd lens group, telecentricity (テレセントリック) necessary when the image pickup device is a CCD or a CMOS can be easily ensured. In addition, by locating the entrance pupil position on the image side, the front-most lens effective diameter can be reduced. That is, the zoom lens can be miniaturized and good optical performance can be ensured by a configuration in which the 3 rd lens group is a stop, a positive lens, a cemented lens of a positive lens and a negative lens, and a positive lens.
The zoom lens according to claim 10 is the invention according to any one of claims 1 to 9, wherein the 1 st lens group is a cemented lens including 3 or more lenses and a positive lens and a negative lens, the positive lens of the cemented lens is at least one or more, and the 1 st lens group satisfies the following conditional expression.
νd1p-νd1n>45 (9)
Wherein,
vd 1 p: abbe number of positive lens of cemented lens included in the 1 st lens group
Vd 1 n: abbe number of negative lens of cemented lens included in the 1 st lens group
By constituting the 1 st lens group with 3 or more lenses, chromatic aberration on the axis at the telephoto end, spherical aberration, coma aberration and astigmatism in the off-axis beam at the wide-angle end, and field curvature can be suppressed. In addition, by using positive and negative cemented lenses, chromatic aberration of magnification caused by an off-axis light beam in the wide-angle end and chromatic aberration of axis generated mainly in the telephoto end can be corrected. Specifically, if the value of conditional expression (9) exceeds the lower limit, chromatic aberration on the axis such that the g-line is located further on the excess side is obtained, and the g-line has a lower image height than the d-line, thereby suppressing chromatic aberration of magnification.
The zoom lens according to claim 11 is the invention according to any one of claims 1 to 10, wherein the 2 nd lens group is composed of, in order from the object side, a negative lens, and a positive lens, and has an aspherical surface on at least one surface.
By providing the 2 nd lens group with a negative lens, and a positive lens from the object side, field curvature, distortion aberration, and chromatic aberration of magnification can be corrected satisfactorily with a small number of lenses. Further, since it is possible to favorably correct various aberrations such as coma, astigmatism, and field curvature, which are mainly generated at the wide-angle end, by making at least one surface aspherical, it is possible to reduce the size of the zoom lens and to ensure favorable optical performance.
The zoom lens according to claim 12 is the invention according to any one of claims 1 to 11, wherein image blur can be corrected by moving the 2 nd lens group or the 3 rd lens group in a direction orthogonal to the optical axis.
In the case of correcting image shake, it is preferable to move a small and lightweight lens group in the direction perpendicular to the optical axis. This is to prevent an actuator mechanism for correcting image shake from becoming complicated and large in size by using a small and lightweight lens group as a correction lens group. In addition, in order to ensure good optical performance after image shake correction, it is necessary to correct aberrations generated in a lens group moving in a direction orthogonal to the optical axis. Therefore, by using the 2 nd lens group or the 3 rd lens group, which corrects aberrations well and has a relatively thin thickness, as the camera-shake correction group, it is possible to ensure good optical performance and to miniaturize the actuator mechanism for image-shake correction.
The zoom lens according to claim 13 is the invention according to any one of claims 1 to 12, wherein the 4 th lens group is composed of 1 negative lens and has at least one aspherical surface.
By configuring the 4 th lens group with one negative lens, the lens structure can be simplified and reduced in weight, and the driving mechanism for driving the 4 th lens group can be reduced in size. Further, by making at least 1 surface of such a negative lens aspherical, it is possible to correct field curvature and distortion aberration of the off-axis light flux and to ensure good optical performance.
The zoom lens according to claim 14 is the invention according to any one of claims 1 to 13, wherein a lens group closest to the image surface side is formed of one positive lens made of plastic, and has at least one aspherical surface.
By forming the lens group closest to the image surface side by one positive lens made of plastic, cost reduction can be achieved as compared with the case of using a glass lens. Further, since there is no optical element having power after the lens group on the most image surface side, there is an advantage that aberration generated in the lens group on the most image surface side does not expand in the subsequent light path and is difficult to be conspicuous. Therefore, even if the zoom lens is made of a plastic lens having a low refractive index, deterioration of optical performance due to temperature change is small, and the influence on the optical performance of the entire zoom lens is small. Further, by making at least 1 surface aspherical, field curvature and distortion aberration in the off-axis beam can be corrected, and good optical performance can be obtained.
The zoom lens according to claim 15 is the invention according to any one of claims 1 to 14, wherein the zoom lens has a lens having substantially no optical power. Such a zoom lens is also within the scope of the present invention.
The imaging device according to claim 16, comprising the zoom lens according to any one of claims 1 to 15.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a compact zoom lens and an image pickup apparatus having a high zoom ratio suitable for a digital camera, a video camera, and the like are provided.
Drawings
Fig. 1 is an external view of a digital camera as an example of an image pickup apparatus including the zoom lens of the present embodiment, where (a) is a front view and (b) is a rear view.
Fig. 2 is a sectional view (a) at the wide angle end, a sectional view (b) at the middle, and a sectional view (c) at the telephoto end of the zoom lens of embodiment 1.
Fig. 3 are aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 1, which are an aberration diagram (a) at the wide-angle end, an intermediate aberration diagram (b), and an aberration diagram (c) at the telephoto end.
Fig. 4 is a sectional view (a) at the wide angle end, a sectional view (b) at the middle, and a sectional view (c) at the telephoto end of the zoom lens of embodiment 2.
Fig. 5 are aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 2, which are an aberration diagram (a) at the wide-angle end, an intermediate aberration diagram (b), and an aberration diagram (c) at the telephoto end.
Fig. 6 is a sectional view (a) at the wide angle end, a sectional view (b) at the middle, and a sectional view (c) at the telephoto end of the zoom lens of embodiment 3.
Fig. 7 is an aberration diagram (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 3, which is an aberration diagram (a) at the wide angle end, an intermediate aberration diagram (b), and an aberration diagram (c) at the telephoto end.
Fig. 8 is a sectional view (a) at the wide angle end, a sectional view (b) at the middle, and a sectional view (c) at the telephoto end of the zoom lens of embodiment 4.
Fig. 9 is an aberration diagram (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 4, which is an aberration diagram (a) at the wide angle end, an intermediate aberration diagram (b), and an aberration diagram (c) at the telephoto end.
Fig. 10 is a sectional view at the wide-angle end (a), an intermediate sectional view (b), and a sectional view at the telephoto end (c) of the zoom lens of embodiment 5.
Fig. 11 is an aberration diagram (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 5, which is an aberration diagram (a) at the wide-angle end, an aberration diagram (b) at the middle, and an aberration diagram (c) at the telephoto end.
Fig. 12 is a sectional view at the wide-angle end (a), an intermediate sectional view (b), and a sectional view at the telephoto end (c) of the zoom lens of embodiment 6.
Fig. 13 are aberration diagrams (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 6, which are an aberration diagram (a) at the wide-angle end, an intermediate aberration diagram (b), and an aberration diagram (c) at the telephoto end.
Fig. 14 is a sectional view at the wide-angle end (a), an intermediate sectional view (b), and a sectional view at the telephoto end (c) of the zoom lens of embodiment 7.
Fig. 15 is an aberration diagram (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 7, which is an aberration diagram (a) at the wide angle end, an intermediate aberration diagram (b), and an aberration diagram (c) at the telephoto end.
Detailed Description
Embodiments of the present invention are described below with reference to the drawings. Fig. 1 is an external view of a digital camera as an example of an image pickup apparatus including the zoom lens according to the present embodiment. Fig. 1(a) is a front view of the digital camera 1, and fig. 1(b) is a rear view.
As shown in fig. 2, the digital camera 1 is constituted by an image pickup section 2 having a lens barrel (lens body) holding a zoom lens and an image pickup element, and a camera body section 3.
The image pickup section 2 is configured by a lens barrel holding a zoom lens capable of variable magnification operation shown in the embodiment described below and a solid-state image pickup device such as a CCD or a CMOS, and converts an object image formed through the zoom lens in the lens barrel into an image signal by the solid-state image pickup device.
The camera main body 3 has an LCD Display unit 6 including an LCD (Liquid Crystal Display), an EVF (Electronic View Finder) 7, and an external connection terminal for connecting the digital camera 1 to a personal computer (not shown), and performs predetermined signal processing on an image signal acquired by the image pickup unit 2, such as image Display on the LCD Display unit 6 or the EVF7, image recording on a recording medium such as a memory card (not shown), or image transfer to the personal computer.
A flash light emitting unit 4 is provided at an appropriate upper position on the front surface of the camera body 3. Further, an LCD display unit 6 and an EVF7 for displaying a photographed image and reproducing and displaying a recorded image are provided on the rear surface of the camera body 3.
A shutter button 5 is provided on the upper surface of the camera body section 3, and a photographing mode switching switch, not shown, for switching between a "recording mode" and a "playback mode" is provided in the vicinity of the shutter button 5. The recording mode is a mode for photographing from the photographing standby state through the process of exposure control, and the reproducing mode is a mode for reproducing and displaying a photographed image recorded in the memory card on the LCD display unit 6 or the EVF 7.
A playback frame-by-frame playback switch/zoom switch 9 for performing playback image playback (コマ delivery り) or zoom operation during shooting is provided on the back surface of the camera body section 3. The frame-by-frame playback for playing back the playback image in the frame-by-frame playback switch/zoom switch 9 is a mode in which the camera is set to the playback mode, and the image recorded in the memory card 13 is sequentially displayed on the LCD display unit 6 together with the frame (コマ) number. Further, the image display on the LCD display unit 6 can be instructed to be changed in the ascending direction (direction of the shooting order) or the descending direction (direction opposite to the shooting order). In the zoom operation during shooting, the zoom lens is zoomed in the telephoto direction or the wide-angle direction by operating the playback frame-by-frame play switch/zoom switch 9.
Further, an EVF changeover switch 8 for selecting the LCD display unit 6 and the EVF7 for displaying images is provided on the rear surface of the camera body 3.
A battery (not shown) as an operating power source of the digital camera 1 is provided inside the bottom surface of the camera body 3.
(examples)
Next, examples of zoom lenses suitable for the above-described embodiments are described. However, the present invention is not limited to the examples shown below. The symbols used in the respective examples are as follows.
f: focal length of entire system of camera lens (mm)
Fno: f number (number)
2 ω: angle of vision (°)
Y: image height (mm)
R: radius of curvature (mm)
D: spacing above the shaft (mm)
Nd: refractive index of d-line relative to lens material
V d: abbe number of lens material
In each of the embodiments, a surface denoted by "", which is a surface having an aspherical shape, is represented by the following "expression 1" in which the vertex of the surface is set as the origin, the X axis is taken along the optical axis direction, and the height in the direction perpendicular to the optical axis is set as h.
[ formula 1]
Wherein,
ai: i-th order aspherical surface coefficient
R: radius of curvature
K: constant of cone
(example 1)
Table 1 shows lens data of example 1, and further, after that (including lens data of the table), a power multiplier of 10 (for example, 2.5 × 10)-02) It is represented by E (e.g., 2.5E-02). The values expressed in size are in mm.
(Table 1)
Example 1
f (focal length of the whole system) is 4.62-20.99-96.60
Fno＝3.51-5.62-6.47
2 omega (field angle) 79.71-20.82-4.57 °
Y (image height) 3.170-3.873-3.888
Group 1: 1 to 6 sides
And 2, group: 7 to 12 sides
And 3, group: 13 to 21 sides
4 groups are as follows: 22 to 23 sides
And 5, group: 24 to 25 sides
Focal length, F number, group interval of each position
Entrance pupil position, exit pupil position (all positive from the image side of L1),
Front principal point position, rear principal point position (both positive image side from L1)
Lens group data
Coefficient of aspheric surface
The 20 th plane K is 0
A4＝-0.3977E-03
A6＝0.3107E-03
A8＝-0.4596E-04
A10＝0.1065E-05
A12＝0.1732E-06
The 21 st plane K is 0
A4＝0.2276E-03
A6＝0.1841E-03
A8＝-0.2010E-04
A10＝-0.3031E-06
A12＝0.1549E-06
Fig. 2 is a sectional view of a zoom lens according to embodiment 1, fig. 2(a) is a sectional view at the wide-angle end, fig. 2(b) is a sectional view in the middle, and fig. 2(c) is a sectional view at the telephoto end. In the figure, G1 is the 1 st lens group having positive refractive power, G2 is the 2 nd lens group having negative refractive power, G3 is the 3 rd lens group having positive refractive power, G4 is the 4 th lens group having negative refractive power, and G5 is the 5 th lens group having positive refractive power, and they are arranged in this order from the object side. The 1 st lens group G1 is composed of a cemented lens that cemented a negative lens L1 and a positive lens L2, and a positive lens L3. The 2 nd lens group G2 is composed of a negative lens L4, a negative lens L5, and a positive lens L6. The 3 rd lens group G3 is composed of a stop S, a positive lens L7, a cemented lens that cemented the positive lens L8 and the negative lens L9, and a positive lens L10. The 4 th lens group G4 is constituted only by the negative lens L11. The 5 th lens group G5 is composed of only a plastic positive lens L12. I denotes an imaging surface. F1 and F2 represent parallel flat plates assuming optical low-pass filters, IR cut filters, sealing glasses for solid-state imaging devices, and the like.
In the zoom lens according to embodiment 1, the 1 st lens group G1, the 2 nd lens group G2, the 3 rd lens group G3, the 4 th lens group G4 move in the optical axis direction at the time of magnification change, and magnification change can be performed by changing the intervals of the respective lens groups. The 5 th lens group G5 is fixed. Further, by moving the 4 th lens group G4, focusing (focusing) can be performed from infinity over a limited distance. Further, image blur correction can be performed by displacing either the 2 nd lens group G2 or the 3 rd lens group G3 in the direction orthogonal to the optical axis. In example 1, the lens satisfying the zoom ratio of 20.9 and nd >1.9 is surface number 1 of the 1 st lens group G1, surface number 11 of the 2 nd lens group G2, and surface number 18 of the 3 rd lens group G1. The surface numbers 2 and 17 denote adhesives.
Fig. 3 is an aberration diagram (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 1. Here, fig. 3(a) is an aberration diagram at the wide-angle end. Fig. 3(b) is an intermediate aberration diagram. Fig. 3(c) is an aberration diagram of the telephoto end. In the spherical aberration diagram, the broken line indicates the amount of spherical aberration with respect to the g-line and the solid line indicates the amount of spherical aberration with respect to the d-line. In the astigmatism diagrams, a solid line S represents a sagittal plane and a broken line M represents a meridional plane (the same applies hereinafter).
(example 2)
Table 2 shows lens data of example 2.
(Table 2)
Example 2
f (focal length of the whole system) is 4.70-22.51-97.31
Fno＝3.58-5.68-6.88
2 omega (field angle) 78.70-19.44-4.54 °
Y (image height) 3.190-3.911-3.789
Group 1: 1 to 6 sides
And 2, group: 7 to 12 sides
And 3, group: 13 to 21 sides
4 groups are as follows: 22 to 23 sides
And 5, group: 24 to 25 sides
Focal length, F number, group interval of each position
Entrance pupil position, exit pupil position (all positive from the image side of L1),
Front principal point position, rear principal point position (both positive image side from L1)
Lens group data
Coefficient of aspheric surface
The 22 nd plane K is 0
A4＝-0.9903E-04
A6＝0.1097E-04
A8＝-0.1720E-05
A10＝-0.3895E-06
A12＝0.0000E+00
No. 23K is 0
A4＝0.3300E-03
A6＝0.4214E-04
A8＝-0.8571E-05
A10＝0.0000E+00
A12＝0.0000E+00
Fig. 4 is a sectional view of a zoom lens according to embodiment 2, fig. 4(a) is a sectional view at the wide-angle end, fig. 4(b) is a sectional view in the middle, and fig. 4(c) is a sectional view at the telephoto end. In the figure, G1 is the 1 st lens group having positive refractive power, G2 is the 2 nd lens group having negative refractive power, G3 is the 3 rd lens group having positive refractive power, G4 is the 4 th lens group having negative refractive power, and G5 is the 5 th lens group having positive refractive power, and they are arranged in this order from the object side. The 1 st lens group G1 is composed of a cemented lens that cemented a negative lens L1 and a positive lens L2, and a positive lens L3. The 2 nd lens group G2 is composed of a negative lens L4, a cemented lens that cemented the negative lens L5 and the positive lens L6. The 3 rd lens group G3 is composed of a stop S, a positive lens L7, a cemented lens that cemented the positive lens L8, the negative lens L9, and the positive lens 10. The 4 th lens group G4 is constituted only by the negative lens L11. The 5 th lens group G5 is composed of only a plastic positive lens L12. I denotes an imaging surface. F1 and F2 represent parallel flat plates assuming optical low-pass filters, IR cut filters, sealing glasses for solid-state imaging devices, and the like.
In the zoom lens according to embodiment 2, the 1 st lens group G1, the 2 nd lens group G2, the 3 rd lens group G3, the 4 th lens group G4 move in the optical axis direction at the time of magnification change, and magnification change can be performed by changing the intervals of the respective lens groups. The 5 th lens group G5 is fixed. Further, by moving the 4 th lens group G4, focusing (focusing) can be performed from infinity over a limited distance. Further, image blur correction can be performed by displacing either the 2 nd lens group G2 or the 3 rd lens group G3 in the direction perpendicular to the optical axis. In example 2, the lens satisfying the zoom ratio of 20.7 and nd >1.9 is the surface number 1 of the 1 st lens group G1, and is the surface number 7 or 11 of the 2 nd lens group G2. Note that the surface numbers 2, 10, 17, and 19 denote adhesives.
Fig. 5 is an aberration diagram (spherical aberration, astigmatism, and distortion) of the zoom lens according to embodiment 2. Here, fig. 5(a) is an aberration diagram at the wide-angle end. Fig. 5(b) is an intermediate aberration diagram. Fig. 5(c) is an aberration diagram of the telephoto end.
(example 3)
Table 3 shows lens data of example 3.
(Table 3)
Example 3
f (total focal length) ═ 4.62-20.98-96.60
Fno＝3.46-5.65-6.43
2 omega (field angle) 79.71-20.83-4.57 °
Y (image height) 3.161-3.953-3.950
Group 1: 1 to 6 sides
And 2, group: 7 to 12 sides
And 3, group: 13 to 21 sides
4 groups are as follows: 22 to 23 sides
And 5, group: 24 to 25 sides
Focal length, F number, group interval of each position
Entrance pupil position, exit pupil position (all positive from the image side of L1),
Front principal point position, rear principal point position (both positive image side from L1)
Lens group data
Coefficient of aspheric surface
The 20 th plane K is 0
A4＝-0.1103E-02
A6＝0.5275E-04
A8＝0.3812E-04
A10＝-0.7761E-05
A12＝0.4748E-06
The 21 st plane K is 0
A4＝0.1114E-03
A6＝0.2933E-04
A8＝0.3905E-04
A10＝-0.7457E-05
A12＝0.4704E-06
Fig. 6 is a sectional view of a zoom lens according to embodiment 3, fig. 6(a) being a sectional view at the wide-angle end, fig. 6(b) being a sectional view in the middle, and fig. 6(c) being a sectional view at the telephoto end. In the figure, G1 is the 1 st lens group having positive refractive power, G2 is the 2 nd lens group having negative refractive power, G3 is the 3 rd lens group having positive refractive power, G4 is the 4 th lens group having negative refractive power, and G5 is the 5 th lens group having positive refractive power, and they are arranged in this order from the object side. The 1 st lens group G1 is composed of a cemented lens that cemented a negative lens L1 and a positive lens L2, and a positive lens L3. The 2 nd lens group G2 is composed of a negative lens L4, a negative lens L5, and a positive lens L6. The 3 rd lens group G3 is composed of a stop S, a positive lens L7, a cemented lens that cemented the positive lens L8 and the negative lens L9, and a positive lens 10. The 4 th lens group G4 is constituted only by the negative lens L11. The 5 th lens group G5 is composed of only a plastic positive lens L12. I denotes an imaging surface. F1 and F2 represent parallel flat plates assuming optical low-pass filters, IR cut filters, sealing glasses for solid-state imaging devices, and the like.
In the zoom lens according to embodiment 3, the 1 st lens group G1, the 2 nd lens group G2, the 3 rd lens group G3, the 4 th lens group G4 move in the optical axis direction at the time of magnification change, and magnification change can be performed by changing the intervals of the respective lens groups. The 5 th lens group G5 is fixed. Further, by moving the 4 th lens group G4, focusing (focusing) can be performed from infinity over a limited distance. Further, image blur correction can be performed by displacing either the 2 nd lens group G2 or the 3 rd lens group G3 in the direction perpendicular to the optical axis. In example 3, the lens satisfying the zoom ratio of 20.9 and nd >1.9 is the surface number 1 of the 1 st lens group G1, the surface number 11 of the 2 nd lens group G2, and the surface number 18 of the 3 rd lens group G3. Further, the surface numbers 2 and 17 denote adhesives.
Fig. 7 is an aberration diagram (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 3. Here, fig. 7(a) is an aberration diagram at the wide-angle end. Fig. 7(b) is an intermediate aberration diagram. Fig. 5(c) is an aberration diagram of the telephoto end.
(example 4)
Table 4 shows lens data of example 4.
(Table 4)
Example 4
f (focal length of the whole system) is 4.75-22.50-98.49
Fno＝3.24-5.62-6.89
2 omega (field angle) 78.13-19.45-4.48 degree
Y (image height) 3.139-3.953-3.871
Group 1: 1 to 6 sides
And 2, group: 7 to 12 sides
And 3, group: 13 to 21 sides
4 groups are as follows: 22 to 23 sides
And 5, group: 24 to 25 sides
Focal length, F number, group interval of each position
Entrance pupil position, exit pupil position (all positive from the image side of L1),
Front principal point position, rear principal point position (both positive image side from L1)
Lens group data
Coefficient of aspheric surface
The 22 nd plane K is 0
A4＝0.3995E-03
A6＝0.2173E-04
A8＝-0.4049E-05
A10＝-0.2530E-06
A12＝0.0000E+00
No. 23K is 0
A4＝0.1075E-02
A6＝0.7550E-04
A8＝-0.1193E-04
A10＝0.0000E+00
A12＝0.0000E+00
Fig. 8 is a sectional view of a zoom lens according to embodiment 4, fig. 8(a) is a sectional view at the wide-angle end, fig. 8(b) is a sectional view in the middle, and fig. 8(c) is a sectional view at the telephoto end. In the figure, G1 is the 1 st lens group having positive refractive power, G2 is the 2 nd lens group having negative refractive power, G3 is the 3 rd lens group having positive refractive power, G4 is the 4 th lens group having negative refractive power, and G5 is the 5 th lens group having positive refractive power, and they are arranged in this order from the object side. The 1 st lens group G1 is composed of a cemented lens that cemented a negative lens L1 and a positive lens L2, and a positive lens L3. The 2 nd lens group G2 is composed of a negative lens L4, a cemented lens that cemented the negative lens L5 and the positive lens L6. The 3 rd lens group G3 is composed of a stop S, a positive lens L7, a cemented lens that cemented the positive lens L8, the negative lens L9, and the positive lens 10. The 4 th lens group G4 is constituted only by the negative lens L11. The 5 th lens group G5 is composed of only a plastic positive lens L12. I denotes an imaging surface. F1 and F2 represent parallel flat plates assuming optical low-pass filters, IR cut filters, sealing glasses for solid-state imaging devices, and the like.
In the zoom lens according to embodiment 4, the 1 st lens group G1, the 2 nd lens group G2, the 3 rd lens group G3, the 4 th lens group G4 move in the optical axis direction at the time of magnification change, and magnification change can be performed by changing the intervals of the respective lens groups. The 5 th lens group G5 is fixed. Further, by moving the 4 th lens group G4, Focusing (Focusing) can be performed from infinity over a limited distance. Further, image blur correction can be performed by displacing either the 2 nd lens group G2 or the 3 rd lens group G3 in the direction perpendicular to the optical axis. In example 4, the lens satisfying the zoom ratio of 20.7 and nd >1.9 is surface number 1 of the 1 st lens group G1, surface number 11 of the 2 nd lens group G2, and surface number 18 of the 3 rd lens group G3. The surface numbers 2, 10, 17 and 19 denote adhesives.
Fig. 9 is an aberration diagram (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 4. Here, fig. 9(a) is an aberration diagram at the wide-angle end. Fig. 9(b) is an intermediate aberration diagram. Fig. 9(c) is an aberration diagram of the telephoto end.
(example 5)
Table 5 shows lens data of example 5.
(Table 5)
Example 5
f (focal length of the whole system) is 4.23-21.50-105.71
Fno＝3.45-6.18-6.43
2 omega (field angle) 84.73-20.33-4.18 °
Y (image height) 3.160-3.953-3.875
Group 1: 1 to 6 sides
And 2, group: 7 to 12 sides
And 3, group: 13 to 21 sides
4 groups are as follows: 22 to 23 sides
And 5, group: 24 to 25 sides
Focal length, F number, group interval of each position
Entrance pupil position, exit pupil position (all positive from the image side of L1),
Front principal point position, rear principal point position (both positive image side from L1)
Lens group data
Focal length of lens set starting surface (mm)
Coefficient of aspheric surface
The 20 th plane K is 0
A4＝-0.2538E-02
A6＝0.3573E-04
A8＝0.7366E-04
A10＝-0.1004E-04
A12＝0.4810E-06
The 21 st plane K is 0
A4＝-0.3137E-03
A6＝-0.2115E-05
A8＝0.6566E-04
A10＝-0.8804E-05
A12＝0.4674E-06
Fig. 10 is a sectional view of a zoom lens according to embodiment 5, fig. 10(a) is a sectional view at the wide-angle end, fig. 10(b) is a sectional view in the middle, and fig. 10(c) is a sectional view at the telephoto end. In the figure, G1 is the 1 st lens group having positive refractive power, G2 is the 2 nd lens group having negative refractive power, G3 is the 3 rd lens group having positive refractive power, G4 is the 4 th lens group having negative refractive power, and G5 is the 5 th lens group having positive refractive power, and they are arranged in this order from the object side. The 1 st lens group G1 is composed of a cemented lens that cemented a negative lens L1 and a positive lens L2, and a positive lens L3. The 2 nd lens group G2 is composed of a negative lens L4, a negative lens L5, and a positive lens L6. The 3 rd lens group G3 is composed of a stop S, a positive lens L7, a cemented lens that cemented the positive lens L8 and the negative lens L9, and a positive lens 10. The 4 th lens group G4 is constituted only by the negative lens L11. The 5 th lens group G5 is composed of only a plastic positive lens L12. I denotes an imaging surface. F1 and F2 represent parallel flat plates assuming optical low-pass filters, IR cut filters, sealing glasses for solid-state imaging devices, and the like.
In the zoom lens according to embodiment 5, the 1 st lens group G1, the 2 nd lens group G2, the 3 rd lens group G3, the 4 th lens group G4 move in the optical axis direction at the time of magnification change, and magnification change can be performed by changing the intervals of the respective lens groups. The 5 th lens group G5 is fixed. Further, by moving the 4 th lens group G4, Focusing (Focusing) can be performed from infinity over a limited distance. Further, image blur correction can be performed by displacing either the 2 nd lens group G2 or the 3 rd lens group G3 in the direction perpendicular to the optical axis. In example 5, the lens satisfying the zoom ratio of 25.0 and nd >1.9 is the surface number 1 of the 1 st lens group G1, the surface number 11 of the 2 nd lens group G2, and the surface number 18 of the 3 rd lens group G3. Further, the surface numbers 2 and 17 denote adhesives.
Fig. 11 is an aberration diagram (spherical aberration, astigmatism, and distortion) of the zoom lens according to embodiment 5. Here, fig. 11(a) is an aberration diagram at the wide-angle end. Fig. 11(b) is an intermediate aberration diagram. Fig. 11(c) is an aberration diagram of the telephoto end.
(example 6)
Table 6 shows lens data of example 6.
(Table 6)
Example 6
f (focal length of the whole system) is 4.51-18.93-75.74
Fno＝3.45-5.19-5.86
2 omega (field angle) 81.08-23.02-5.83 °
Y (image height) 3.163-3.953-3.916
Group 1: 1 to 6 sides
And 2, group: 7 to 12 sides
And 3, group: 13 to 21 sides
4 groups are as follows: 22 to 23 sides
And 5, group: 24 to 25 sides
Focal length, F number, group interval of each position
Entrance pupil position, exit pupil position (all positive from the image side of L1),
Front principal point position, rear principal point position (both positive image side from L1)
Lens group data
Coefficient of aspheric surface
The 20 th plane K is 0
A4＝-0.2416E-02
A6＝0.2907E-05
A8＝0.3953E-04
A10＝-0.7100E-05
A12＝0.4748E-06
The 21 st plane K is 0
A4＝-0.2346E-03
A6＝-0.1964E-04
A8＝0.4351E-04
A10＝-0.7082E-05
A12＝0.4704E-06
Fig. 12 is a sectional view of a zoom lens according to embodiment 6, fig. 12(a) being a sectional view at the wide-angle end, fig. 12(b) being a sectional view in the middle, and fig. 12(c) being a sectional view at the telephoto end. In the figure, G1 is the 1 st lens group having positive refractive power, G2 is the 2 nd lens group having negative refractive power, G3 is the 3 rd lens group having positive refractive power, G4 is the 4 th lens group having negative refractive power, and G5 is the 5 th lens group having positive refractive power, and they are arranged in this order from the object side. The 1 st lens group G1 is composed of a cemented lens that cemented a negative lens L1 and a positive lens L2, and a positive lens L3. The 2 nd lens group G2 is composed of a negative lens L4, a negative lens L5, and a positive lens L6. The 3 rd lens group G3 is composed of a stop S, a positive lens L7, a cemented lens that cemented the positive lens L8 and the negative lens L9, and a positive lens 10. The 4 th lens group G4 is constituted only by the negative lens L11. The 5 th lens group G5 is composed of only a plastic positive lens L12. I denotes an imaging surface. F1 and F2 represent parallel flat plates assuming optical low-pass filters, IR cut filters, sealing glasses for solid-state imaging devices, and the like.
In the zoom lens according to embodiment 6, the 1 st lens group G1, the 2 nd lens group G2, the 3 rd lens group G3, the 4 th lens group G4 move in the optical axis direction at the time of magnification change, and magnification change can be performed by changing the intervals of the respective lens groups. The 5 th lens group G5 is fixed. Further, by moving the 4 th lens group G4, focusing (focusing) can be performed from infinity over a limited distance. Further, image blur correction can be performed by displacing either the 2 nd lens group G2 or the 3 rd lens group G3 in the direction perpendicular to the optical axis. In example 6, the lens satisfying the zoom ratio of 16.8 and nd >1.9 is the surface number 1 of the 1 st lens group G1, the surface number 11 of the 2 nd lens group G2, and the surface number 18 of the 3 rd lens group G3. Further, the surface numbers 2 and 17 denote adhesives.
Fig. 13 is an aberration diagram (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 6. Here, fig. 13(a) is an aberration diagram at the wide-angle end. Fig. 13(b) is an intermediate aberration diagram. Fig. 13(c) is an aberration diagram of the telephoto end.
(example 7)
Table 7 shows lens data of example 7.
(Table 7)
Example 7
f (focal length of the whole system) is 4.62-22.97-96.60
Fno＝3.45-5.64-6.42
2 omega (field angle) is 79.72-19.06-4.57 °
Y (image height) 3.169-3.951-3.965
Group 1: 1 to 6 sides
And 2, group: 7 to 12 sides
And 3, group: 13 to 21 sides
4 groups are as follows: 22 to 23 sides
And 5, group: 24 to 25 sides
Focal length, F number, group interval of each position
Entrance pupil position, exit pupil position (all positive from the image side of L1),
Front principal point position, rear principal point position (both positive image side from L1)
Lens group data
Coefficient of aspheric surface
The 20 th plane K is 0
A4＝-0.9623E-03
A6＝0.7784E-04
A8＝0.2933E-04
A10＝-0.7365E-05
A12＝0.4748E-06
The 21 st plane K is 0
A4＝0.4079E-03
A6＝0.6379E-04
A8＝0.3184E-04
A10＝-0.7161E-05
A12＝0.4704E-06
Fig. 14 is a sectional view of a zoom lens according to embodiment 7, fig. 14(a) is a sectional view at the wide-angle end, fig. 14(b) is a sectional view in the middle, and fig. 14(c) is a sectional view at the telephoto end. In the figure, G1 is the 1 st lens group having positive refractive power, G2 is the 2 nd lens group having negative refractive power, G3 is the 3 rd lens group having positive refractive power, G4 is the 4 th lens group having negative refractive power, and G5 is the 5 th lens group having positive refractive power, and they are arranged in this order from the object side. The 1 st lens group G1 is composed of a cemented lens that cemented a negative lens L1 and a positive lens L2, and a positive lens L3. The 2 nd lens group G2 is composed of a negative lens L4, a negative lens L5, and a positive lens L6. The 3 rd lens group G3 is composed of a stop S, a positive lens L7, a cemented lens that cemented the positive lens L8 and the negative lens L9, and a positive lens 10. The 4 th lens group G4 is constituted only by the negative lens L11. The 5 th lens group G5 is composed of only a plastic positive lens L12. I denotes an imaging surface. F1 and F2 represent parallel flat plates assuming optical low-pass filters, IR cut filters, sealing glasses for solid-state imaging devices, and the like.
In the zoom lens according to embodiment 7, the 1 st lens group G1, the 2 nd lens group G2, the 3 rd lens group G3, the 4 th lens group G4 move in the optical axis direction at the time of magnification change, and magnification change can be performed by changing the intervals of the respective lens groups. The 5 th lens group G5 is fixed. Further, by moving the 4 th lens group G4, focusing (focusing) can be performed from infinity over a limited distance. Further, image blur correction can be performed by displacing either the 2 nd lens group G2 or the 3 rd lens group G3 in the direction perpendicular to the optical axis. In example 7, the lens satisfying the zoom ratio of 20.9 and nd >1.9 is surface number 1 of the 1 st lens group G1, surface number 11 of the 2 nd lens group G2, and surface number 18 of the 3 rd lens group G3. Further, the surface numbers 2 and 17 denote adhesives.
Fig. 15 is an aberration diagram (spherical aberration, astigmatism, and distortion aberration) of the zoom lens according to embodiment 7. Here, fig. 15(a) is an aberration diagram at the wide-angle end. Fig. 15(b) is an intermediate aberration diagram. Fig. 15(c) is an aberration diagram of the telephoto end.
Table 8 shows values of each example corresponding to each conditional expression.
[ Table 8]
The present invention is not limited to the embodiments and/or examples described in the specification but includes other examples and/or modifications, and it is obvious to those skilled in the art from the embodiments, examples, or technical ideas described in the specification. The description and examples are intended for purposes of illustration only, and the scope of the present invention is set forth in the claims that follow. For example, a virtual lens (ダミーレンズ) having substantially no optical power is further provided, and the present invention is also applicable. In addition, the zoom lens may be made retractable.
Description of the reference symbols
1 digital camera
2 image pickup part
3 Camera body part
4 flash light emitting part
5 shutter button
6 display part
7 EVF
8 change-over switch
9 zoom switch
G1-G5 lens group
L1-L12 lens
Claims (15)
1. A zoom lens comprising, in order from an object side to an image side, a 1 st lens group having positive refractive power, a 2 nd lens group having negative refractive power, a 3 rd lens group having a stop and positive refractive power, a 4 th lens group having negative refractive power, and a 5 th lens group having positive refractive power, wherein magnification is changed by changing an interval between the lens groups, wherein the following conditional expressions are satisfied:
(T2+T3)/fW<2.58 (1)
fT/fW>16.7
wherein,
t2: a thickness (mm) on an optical axis from a lens surface closest to an object side to a lens surface closest to an image side of the 2 nd lens group,
t3: a thickness (mm) on an optical axis from a lens surface closest to an object side to a lens surface closest to an image side of the 3 rd lens group,
f, w: a focal length (mm) at a wide-angle end of the zoom lens,
and f, fT: a focal length (mm) of a telephoto end of the zoom lens,
the 3 rd lens group is composed of, in order from the object side, a diaphragm, a positive lens, a cemented lens of a positive lens and a negative lens, and a positive lens.
2. The zoom lens according to claim 1, wherein the following conditional expression is satisfied:
1.0<(β2t/β2w)/(β3t/β3w)<3.0 (2)
wherein,
β 2 t: the lateral magnification of the telephoto end of the 2 nd lens group,
β 2 w: a lateral magnification at a wide-angle end of the 2 nd lens group,
β 3 t: the lateral magnification of the telephoto end of the 3 rd lens group,
β 3 w: a wide angle end of the 3 rd lens group.
3. A zoom lens according to claim 1 or 2, wherein the following conditional expression is satisfied:
0.4<|f2/f3|<0.8 (3)
f 2: a focal length (mm) of the 2 nd lens group,
f 3: a focal length (mm) of the 3 rd lens group.
4. A zoom lens according to claim 1 or 2, wherein the following conditional expression is satisfied:
wherein,
f 1: a focal length (mm) of the 1 st lens group.
5. A zoom lens according to claim 1 or 2, wherein the following conditional expression is satisfied:
wherein,
t1: a thickness (mm) on an optical axis from a lens surface closest to an object side to a lens surface closest to an image side of the 1 st lens group.
6. A zoom lens according to claim 1 or 2, wherein the following conditional expression is satisfied:
7. the zoom lens according to claim 1 or 2,
at least one lens of each of at least 2 lens groups of the 1 st lens group, the 2 nd lens group, and the 3 rd lens group satisfies the following conditional expression:
nd>1.9 (7)
wherein,
nd: the refractive index of the lenses included in each group with respect to the d-line.
8. The zoom lens according to claim 1 or 2,
the 3 rd lens group includes a cemented lens including a positive lens and a negative lens, the positive lens of the cemented lens is at least one or more, and the 3 rd lens group satisfies the following conditional expression:
νd3p-νd3n>27 (8)
wherein,
vd 3 p: an abbe number of a positive lens of the cemented lens included in the 3 rd lens group,
vd 3 n: an abbe number of a negative lens of the cemented lens included in the 3 rd lens group.
9. The zoom lens according to claim 1 or 2,
the 1 st lens group includes 3 or more lenses and a cemented lens including a positive lens and a negative lens, the positive lens of the cemented lens being at least one or more, and the 1 st lens group satisfies the following conditional expression:
νd1p-νd1n>45 (9)
wherein,
vd 1 p: an abbe number of a positive lens of the cemented lens included in the 1 st lens group,
vd 1 n: an abbe number of a negative lens of the cemented lens included in the 1 st lens group.
10. The zoom lens according to claim 1 or 2,
the 2 nd lens group is composed of, in order from the object side, a negative lens, and a positive lens, and has an aspherical surface on at least one surface.
11. The zoom lens according to claim 1 or 2,
by moving the 2 nd lens group or the 3 rd lens group in the optical axis orthogonal direction, image shake is corrected.
12. The zoom lens according to claim 1 or 2,
the 4 th lens group is composed of 1 negative lens and has at least one aspheric surface.
13. The zoom lens according to claim 1 or 2,
the lens group closest to the image surface side is composed of one positive lens formed by plastic, and has at least one aspheric surface.
14. The zoom lens according to claim 1 or 2,
a lens having substantially no optical power.
15. An image pickup apparatus is characterized in that,
a zoom lens according to any one of claims 1 to 14.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013011857 | 2013-01-25 | ||
| JP2013-011857 | 2013-01-25 | ||
| PCT/JP2013/084570 WO2014115470A1 (en) | 2013-01-25 | 2013-12-25 | Zoom lens and image-capturing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105209951A CN105209951A (en) | 2015-12-30 |
| CN105209951B true CN105209951B (en) | 2017-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201380071334.1A Expired - Fee Related CN105209951B (en) | 2013-01-25 | 2013-12-25 | Zoom lens and camera device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6156706B2 (en) |
| CN (1) | CN105209951B (en) |
| WO (1) | WO2014115470A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6425463B2 (en) * | 2014-08-28 | 2018-11-21 | キヤノン株式会社 | Zoom lens and imaging device having the same |
| JPWO2017131223A1 (en) * | 2016-01-28 | 2018-11-15 | 株式会社ニコン | Zoom lens, optical device, and method of manufacturing zoom lens |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6606200B1 (en) * | 1996-09-19 | 2003-08-12 | Canon Kabushiki Kaisha | Zoom lens device and optical apparatus provided with the same |
| JP2005352183A (en) * | 2004-06-10 | 2005-12-22 | Sony Corp | Variable-focal-length lens system and imaging unit |
| CN101587233A (en) * | 2008-05-23 | 2009-11-25 | 佳能株式会社 | Zoom lens and image pickup apparatus including the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3754805B2 (en) * | 1996-09-19 | 2006-03-15 | キヤノン株式会社 | Zoom lens and optical apparatus using the same |
| US8416505B2 (en) * | 2011-05-26 | 2013-04-09 | Olympus Imaging Corp. | Zoom lens and image pickup apparatus using the same |
| JP5791966B2 (en) * | 2011-05-26 | 2015-10-07 | オリンパス株式会社 | Zoom lens and image pickup apparatus using the same |
-
2013
- 2013-12-25 JP JP2014558475A patent/JP6156706B2/en not_active Expired - Fee Related
- 2013-12-25 CN CN201380071334.1A patent/CN105209951B/en not_active Expired - Fee Related
- 2013-12-25 WO PCT/JP2013/084570 patent/WO2014115470A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6606200B1 (en) * | 1996-09-19 | 2003-08-12 | Canon Kabushiki Kaisha | Zoom lens device and optical apparatus provided with the same |
| JP2005352183A (en) * | 2004-06-10 | 2005-12-22 | Sony Corp | Variable-focal-length lens system and imaging unit |
| CN101587233A (en) * | 2008-05-23 | 2009-11-25 | 佳能株式会社 | Zoom lens and image pickup apparatus including the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JP6156706B2 (en) | 2017-07-05 |
| CN105209951A (en) | 2015-12-30 |
| WO2014115470A1 (en) | 2014-07-31 |
| JPWO2014115470A1 (en) | 2017-01-26 |
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