CN114002834B - Zoom lens and imaging device - Google Patents
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- CN114002834B CN114002834B CN202111279618.2A CN202111279618A CN114002834B CN 114002834 B CN114002834 B CN 114002834B CN 202111279618 A CN202111279618 A CN 202111279618A CN 114002834 B CN114002834 B CN 114002834B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims description 107
- 230000004075 alteration Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 7
- 238000012544 monitoring process Methods 0.000 description 7
- 239000011521 glass Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000006185 dispersion Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 206010034972 Photosensitivity reaction Diseases 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000005499 meniscus Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000036211 photosensitivity Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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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
- G02B15/146—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 more than five groups
- G02B15/1461—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 more than five groups the first group being positive
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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
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Abstract
The invention discloses a zoom lens and an imaging device, wherein the zoom lens comprises a lens main body, the lens main body comprises a lens barrel, and a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with positive focal power, a fifth lens group with negative focal power, a sixth lens group with positive focal power, a seventh lens group with negative focal power and a photosensitive chip, which are sequentially arranged in the lens barrel from front to back, and the second lens group, the fourth lens group, the fifth lens group and the sixth lens group are respectively and movably arranged along the front to back direction relative to the lens barrel.
Description
Technical Field
The present invention relates to the field of optical system design, and in particular, to a zoom lens and an imaging device.
Background
With the development of society, the safety precaution consciousness of people is continuously improved, the security monitoring industry is also developed at a high speed, and the monitoring function is also increased. Zoom lenses have been practically designed and used in the last century, and as lens design technology develops, the application occasions of the zoom lenses are gradually increased. Nowadays, the zoom lens is widely applied to the fields of civil products, security monitoring and the like. However, since the imaging quality of the zoom lens is inferior to that of a normal fixed focal length lens, the use popularity of the zoom lens is not high. In addition, most of the zoom lenses on the market are smaller in target surface size, so that the acquired image resolution is lower, the shooting effect is general, and the picture value is low. In addition, most of the zoom lenses on the market are smaller in aperture, so that the lenses are less in light transmission, the acquired images are darker in low-illumination scenes, and the image quality is difficult to ensure. With the advancement of security and protection to high definition and miniaturization, a lens is required to achieve higher performance and smaller volume.
Disclosure of Invention
The invention mainly aims to provide a zoom lens, which aims to solve the technical problems that the aperture of the zoom lens is smaller, the image plane is smaller, and large zoom and small volume cannot coexist in the prior art.
In order to achieve the above object, the present invention provides a zoom lens, comprising a lens body, wherein the direction from an object side to an image side along an optical axis of the lens body is from front to back;
The lens main body comprises a lens barrel, a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with positive focal power, a fifth lens group with negative focal power, a sixth lens group with positive focal power, a seventh lens group with negative focal power and a photosensitive chip, wherein the first lens group, the second lens group, the fourth lens group, the fifth lens group and the sixth lens group are sequentially arranged in the lens barrel from front to back, at least one of the second lens group, the fourth lens group and the fifth lens group is moved along the optical axis so as to enable the zoom lens to zoom, and the sixth lens group is moved along the optical axis so as to enable the zoom lens to focus;
Wherein the zoom lens satisfies the following conditions: 0.04 < fw/f1 < 0.38, and-2.15 < fw/f2 < -0.24, and 0.35 < fw/f3 < 0.04, and 0.1 < fw/f4 < 0.93, and-1.22 < fw/f5 < -0.14, and 0.15 < fw/f61.31, and-0.85 < fw/f7 < -0.09;
Wherein fw is a focal length of the zoom lens at a wide angle end, f1 is a focal length of the first lens group, f2 is a focal length of the second lens group, f3 is a focal length of the third lens group, f4 is a focal length of the fourth lens group, f5 is a focal length of the fifth lens group, f6 is a focal length of the sixth lens group, and f7 is a focal length of the seventh lens group.
Optionally, the first lens group includes a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, and a fourth lens having positive optical power, which are sequentially arranged from front to back;
The first lens group and the first lens, the second lens, the third lens and the fourth lens meet the following conditions: 0.03 < f1/f11 < 0.28, and-2.21 < f1/f12 < -0.25, and 0.11 < f1/f13 < 1.02, and 0.21 < f1/f14 < 1.91;
wherein f1 is the focal length of the first lens group, f11 is the focal length of the first lens, f12 is the focal length of the second lens, f13 is the focal length of the third lens, and f14 is the focal length of the fourth lens.
Optionally, the second lens group includes a fifth lens with negative focal power, a sixth lens with negative focal power, a seventh lens with positive focal power and an eighth lens with negative focal power, which are sequentially arranged from front to back, wherein the eighth lens is an aspheric lens;
The second lens group and the fifth lens, the sixth lens, the seventh lens and the eighth lens satisfy the following conditions: 0.21 < f2/f21 < 1.91, and 0.07 < f2/f22 < 0.63, and-0.56 < f2/f23 < -0.06, and 0.05 < f2/f24 < 0.49;
Wherein f2 is the focal length of the second lens group, f21 is the focal length of the fifth lens, f22 is the focal length of the sixth lens, f23 is the focal length of the seventh lens, and f24 is the focal length of the eighth lens.
Optionally, the third lens group includes a ninth lens having positive optical power, and the ninth lens is an aspherical lens.
Optionally, the fourth lens group includes a tenth lens with positive optical power, an eleventh lens with positive optical power, a twelfth lens with negative optical power, and a thirteenth lens with negative optical power, which are sequentially arranged from front to back, wherein the tenth lens is an aspheric lens;
The fourth lens group satisfies the following relationship with the tenth lens, the eleventh lens, the twelfth lens, and the thirteenth lens: 0.25 < f4/f41 < 2.21, 0.24 < f4/f42 < 2.18, and-0.18 < f4/f43 < -1.65, and 0.01 < f4/f44 < 0.11;
wherein f4 is a focal length of the fourth lens group, f41 is a focal length of the tenth lens, f42 is a focal length of the eleventh lens, f43 is a focal length of the twelfth lens, and f44 is a focal length of the thirteenth lens.
Optionally, the fifth lens group includes a fourteenth lens having negative optical power, a fifteenth lens having negative optical power, and a sixteenth lens having negative optical power, which are sequentially disposed from front to back;
the fifth lens group satisfies the following relationships with the fourteenth lens, the fifteenth lens, and the sixteenth lens: 0.19 < f5/f51 < 1.7, 0.09 < f5/f52 < 0.82, and 0.06 < f5/f53 < 0.52;
wherein f5 is a focal length of the fifth lens group, f51 is a focal length of the fourteenth lens, f52 is a focal length of the fifteenth lens, and f53 is a focal length of the sixteenth lens.
Optionally, the sixth lens group includes a seventeenth lens having negative optical power, an eighteenth lens having negative optical power, a nineteenth lens having positive optical power, and a twentieth lens having positive optical power, which are sequentially arranged from front to back, wherein the twentieth lens is an aspheric lens;
The sixth lens group satisfies the following relationship with the seventeenth lens, the eighteenth lens, the nineteenth lens, and the twenty-eighth lens: -1.93 < f6/f61 < -0.21, and-0.16 < f6/f62 < -0.02, and 0.15 < f6/f63 < 1.37, and 0.21 < f6/f64 < 1.85;
wherein f6 is a focal length of the sixth lens group, f61 is a focal length of the seventeenth lens, f62 is a focal length of the eighteenth lens, f63 is a focal length of the nineteenth lens, and f64 is a focal length of the twentieth lens.
Optionally, the seventh lens group includes a twenty-first lens having negative optical power.
Optionally, the zoom lens further comprises a diaphragm, and the diaphragm is located between the fourth lens group and the fifth lens group;
the zoom lens satisfies the following conditions: L/TTL is more than 0.09 and less than 0.8;
Wherein L is the distance between the diaphragm and the imaging surface of the zoom lens on the optical axis, and TTL is the total optical length of the zoom lens.
The invention also provides an imaging device, which comprises the zoom lens.
In the technical scheme provided by the invention, the lens main body comprises a lens barrel, a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with positive focal power, a fifth lens group with negative focal power, a sixth lens group with positive focal power, a seventh lens group with negative focal power and a photosensitive chip, wherein the first lens group, the fourth lens group, the fifth lens group and the sixth lens group are sequentially arranged in the lens barrel from front to back, at least one of the second lens group, the fourth lens group and the fifth lens group is moved along the optical axis, so that the zoom lens is zoomed, and the sixth lens group is moved along the optical axis, so that the zoom lens is focused, and the volume, the large aperture and the large aperture of the zoom lens are realized through reasonable arrangement of seven lens groups, the limited focal length ratio of the wide angle end and each lens group, and the large aperture ratio.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a zoom lens according to an embodiment of the present invention;
FIG. 2 is a schematic view of an MTF curve of the zoom lens of FIG. 1 at the wide-angle end;
Fig. 3 is a schematic view of an MTF curve of the zoom lens of fig. 1 at a telephoto end.
Reference numerals illustrate:
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the case where a directional instruction is involved in the embodiment of the present invention, the directional instruction is merely used to explain the relative positional relationship, movement condition, etc. between the components in a specific posture, and if the specific posture is changed, the directional instruction is changed accordingly.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. Also, the technical solutions of the embodiments may be combined with each other, but it is necessary to base the implementation on the basis of those skilled in the art, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist and is not within the scope of protection claimed by the present invention.
With the development of society, the safety precaution consciousness of people is continuously improved, the security monitoring industry is also developed at a high speed, and the monitoring function is also increased. Zoom lenses have been practically designed and used in the last century, and as lens design technology develops, the application occasions of the zoom lenses are gradually increased. Nowadays, the zoom lens is widely applied to the fields of civil products, security monitoring and the like. However, since the imaging quality of the zoom lens is inferior to that of a normal fixed focal length lens, the use popularity of the zoom lens is not high. In addition, most of the zoom lenses on the market are smaller in target surface size, so that the acquired image resolution is lower, the shooting effect is general, and the picture value is low. In addition, most of the zoom lenses on the market are smaller in aperture, so that the lenses are less in light transmission, the acquired images are darker in low-illumination scenes, and the image quality is difficult to ensure. With the advancement of security and protection to high definition and miniaturization, a lens is required to achieve higher performance and smaller volume.
In view of the foregoing, the present invention provides a zoom lens and an imaging apparatus, which are capable of improving the technical problems of the zoom lens in the prior art that the aperture of the zoom lens is small, the image plane is small, and the large zoom and the small volume cannot coexist, and refer to fig. 1 to 3 for an embodiment of the zoom lens.
First, it can be appreciated that the optical power is equal to the difference between the image side beam convergence and the object side beam convergence, which characterizes the ability of the imaging device to deflect light. The greater the absolute value of the optical power, the greater the ability to bend the light, the smaller the absolute value of the optical power, and the weaker the ability to bend the light. When the focal power is positive, the refraction of the light rays is convergent; when the optical power is negative, the refraction of the light is divergent. The optical power may be suitable for characterizing a refractive surface of a lens (i.e. a surface of a lens), for characterizing a lens, or for characterizing a system of lenses together (i.e. a lens group).
The direction from the object side to the image side of the optical axis of the zoom lens is from front to back, and it can be understood that the object side faces the object, and the light transmission direction is from the object side to the image side.
The zoom lens comprises a lens body, wherein the lens body comprises a lens barrel, a first lens group 1 with positive focal power, a second lens group 2 with negative focal power, a third lens group 3 with positive focal power, a fourth lens group 4 with positive focal power, a fifth lens group 5 with negative focal power, a sixth lens group 6 with positive focal power, a seventh lens group 7 with negative focal power and a photosensitive chip 9, which are sequentially arranged in the lens barrel from front to back, the second lens group 2, the fourth lens group 4, the fifth lens group 5 and the sixth lens group 6 are respectively and movably arranged along the front to back relative to the lens barrel, and at least one of the second lens group 2, the fourth lens group 4 and the fifth lens group 5 moves along the optical axis so as to enable the zoom lens to zoom, and the sixth lens group 6 moves along the optical axis so as to enable the zoom lens to focus; wherein the zoom lens satisfies the following conditions: 0.04 < fw/f1 < 0.38, and-2.15 < fw/f2 < -0.24, and 0.35 < fw/f3 < 0.04, and 0.1 < fw/f4 < 0.93, and-1.22 < fw/f5 < -0.14, and 0.15 < fw/f61.31, and-0.85 < fw/f7 < -0.09; wherein fw is a focal length of the zoom lens at a wide-angle end, f1 is a focal length of the first lens group 1, f2 is a focal length of the second lens group 2, f3 is a focal length of the third lens group 3, f4 is a focal length of the fourth lens group 4, f5 is a focal length of the fifth lens group 5, f6 is a focal length of the sixth lens group 6, and f7 is a focal length of the seventh lens group 7.
Specifically, in the present embodiment, the ratio of the focal length of the zoom lens at the wide-angle end to the focal length of each lens group is specifically as follows: fw/f1=8/63, fw/f2= - (68/95), fw/f3=3/26, fw/f4=30/97, fw/f5= - (15/37), fw/f6=38/87, fw/f7= - (28/99).
In the technical solution provided in the present invention, at least one of the second lens group 2, the fourth lens group 4 and the fifth lens group 5 moves along the optical axis to make the zoom lens zoom, the sixth lens group 6 moves along the optical axis to make the zoom lens focus, and the zoom lens has the effects of small volume, large zoom, large image plane and large aperture by reasonable arrangement of seven lens groups and conditional limitation of focal length of wide-angle end of the zoom lens and focal length ratio of each lens group, and the present invention distributes the long zoom stroke of the high magnification lens into the short zoom strokes of a plurality of zoom groups: the lens adopts the structures of zooming of the second lens group 2, the fourth lens group 4, the fifth lens group 5 and the sixth lens group 6, wherein the zooming strokes of the groups are shorter, have certain overlapping and are not interfered with each other, and the zooming strokes of the lens are effectively compressed.
Specifically, the first lens group 1 includes a first lens 11 having positive optical power, a second lens 12 having negative optical power, a third lens 13 having positive optical power, and a fourth lens 14 having positive optical power, which are disposed in this order from front to back; the first lens group 1 and the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 satisfy the following conditions: 0.03 < f1/f11 < 0.28, and-2.21 < f1/f12 < -0.25, and 0.11 < f1/f13 < 1.02, and 0.21 < f1/f14 < 1.91; wherein f1 is the focal length of the first lens group 1, f11 is the focal length of the first lens group 11, f12 is the focal length of the second lens group 12, f13 is the focal length of the third lens group 13, and f14 is the focal length of the fourth lens group 14.
More specifically, in the present embodiment, the first lens element 11 is a convex-concave lens element, i.e., the object-side surface of the first lens element 11 is a convex surface, the image-side surface is a concave surface, the second lens element 12 is a convex-concave lens element, i.e., the object-side surface of the second lens element 12 is a convex surface, the image-side surface is a concave surface, the third lens element 13 is a convex-concave lens element, i.e., the object-side surface of the third lens element 13 is a convex surface, the image-side surface is a concave surface, the fourth lens element 14 is a convex surface, i.e., the object-side surface of the fourth lens element 14 is a convex surface, and the specific ratio of the first lens group to each of the first lens elements is as follows: f1/f11=5/54, f1/f12= - (25/34), f1/f13=29/85, f1/f14=7/11, the powers of the first lens 11 to the fourth lens 14 being in order: 838.37, -105.54, 227.54, 121.88.
Further, the first lens 11 and the second lens 12 constitute a first cemented lens having positive optical power, and the following condition is satisfied: f1/f101 is more than 0.02 and less than 0.16; wherein f1 is the focal length of the first lens group 11, and f101 is the focal length of the first cemented lens; in this embodiment, a specific ratio of the first lens group to the first cemented lens is f1/f101=4/77.
Specifically, the second lens group 2 includes a fifth lens 21 having negative optical power, a sixth lens 22 having negative optical power, a seventh lens 23 having positive optical power, and an eighth lens 24 having negative optical power, which are disposed in order from front to back, wherein the eighth lens 24 is an aspherical lens; the second lens group 2 satisfies the following conditions with the fifth lens 21, the sixth lens 22, the seventh lens 23, and the eighth lens 24: 0.21 < f2/f21 < 1.91, and 0.07 < f2/f22 < 0.63, and-0.56 < f2/f23 < -0.06, and 0.05 < f2/f24 < 0.49; wherein f2 is the focal length of the second lens group 2, f21 is the focal length of the fifth lens element 21, f22 is the focal length of the sixth lens element 22, f23 is the focal length of the seventh lens element 23, and f24 is the focal length of the eighth lens element 24.
More specifically, in the present embodiment, the fifth lens element 21 is a convex-concave lens element, i.e., the object-side surface of the fifth lens element 2121 is a convex surface, the image-side surface of the fifth lens element 2121 is a concave surface, the sixth lens element 22 is a biconcave lens element, the seventh lens element 2323 is a biconvex lens element, and the eighth lens element 24 is a biconcave lens element; and, the specific ratio of the second lens group to each lens is as follows: f2/f21=7/11, f2/f22=5/24, f2/f23= - (18/97), f2/f24=6/37, the optical powers of the fifth lens 21 to the eighth transparent lens are in order: -21.62, -66.13, 74.16, -84.74.
Further, the sixth lens 22 and the seventh lens 23 constitute a second cemented lens having negative optical power, and satisfy the following conditions: 0.03 < f2/f201 < 0.23, wherein f2 is the focal length of the second lens group 2, f201 is the focal length of the second cemented lens, and in this embodiment, the specific ratio of the second lens group to the second cemented lens is f2/f201=1/13.
Specifically, the third lens group 3 includes a ninth lens 31 having positive optical power, and the ninth lens 31 is an aspherical lens.
More specifically, in the present embodiment, the ninth lens 31 is a biconvex lens, and the optical power of the ninth lens 31 is 85.22.
Specifically, the fourth lens group 4 includes a tenth lens 41 having positive optical power, an eleventh lens 42 having positive optical power, a twelfth lens 43 having negative optical power, and a thirteenth lens 44 having negative optical power, which are disposed in this order from front to back, wherein the tenth lens 41 is an aspherical lens; the fourth lens group 4 satisfies the following relationship with the tenth lens 41, the eleventh lens 42, the twelfth lens 43, and the thirteenth lens 44: 0.25 < f4/f41 < 2.21, 0.24 < f4/f42 < 2.18, and-0.18 < f4/f43 < -1.65, and 0.01 < f4/f44 < 0.11; wherein f4 is a focal length of the fourth lens group 4, f41 is a focal length of the tenth lens 41, f42 is a focal length of the eleventh lens 42, f43 is a focal length of the twelfth lens 43, and f44 is a focal length of the thirteenth lens 44.
More specifically, in the present embodiment, the tenth lens 41 is a biconvex lens, the eleventh lens 42 is a biconvex lens, the twelfth lens 43 is a biconcave lens, the thirteenth lens 44 is a biconvex lens, and the specific ratio of the fourth lens group to each of them is as follows: f4/f41=39/53, f4/f42=8/11, f4/f43= - (17/31), f4/f44=1/28, the optical powers of the tenth lens 41 to the thirteenth transparent being, in order: 43.29, 43.77, -58.09, -885.87.
Further, the twelfth lens 43 and the thirteenth lens 44 constitute a third cemented lens having negative optical power, and satisfy the following condition: -1.4 < f4/f401 < -0.16; wherein f4 is a focal length of the fourth lens group 4, f401 is a focal length of the third cemented lens, and in this embodiment, a specific ratio of the fourth lens group to the third cemented lens is f4/f401= - (7/15).
Specifically, the fifth lens group 5 includes a fourteenth lens 51 having negative optical power, a fifteenth lens 52 having negative optical power, and a sixteenth lens 53 having negative optical power, which are disposed in this order from front to back; the fifth lens group 5 satisfies the following relationships with the fourteenth lens 51, the fifteenth lens 52, and the sixteenth lens 53: 0.19 < f5/f51 < 1.7, 0.09 < f5/f52 < 0.82, and 0.06 < f5/f53 < 0.52; wherein f5 is a focal length of the fifth lens group 5, f51 is a focal length of the fourteenth lens group 51, f52 is a focal length of the fifteenth lens group 52, and f53 is a focal length of the sixteenth lens group 53.
More specifically, in the present embodiment, the fourteenth lens element 51 is a biconcave lens element, the fifteenth lens element 52 is a meniscus lens element, i.e., the object-side surface of the fifteenth lens element 52 is a concave surface, the image-side surface is a convex surface, the sixteenth lens element 53 is a biconcave lens element, and the specific ratio of the fifth lens group to each of the lens elements is as follows: f5/f51=38/67, f5/f52=25/92, f5/f53=5/29, the optical powers of the fourteenth lens 51 to the sixteenth lens 53 are in order: -42.85, -89.43, -140.75.
Further, the fifteenth lens 52 and the sixteenth lens 53 constitute a fourth cemented lens having negative optical power, and the following condition is satisfied: 0.13 < f5/f501 < 1.19, where f5 is the focal length of the fifth lens group 5, and f501 is the focal length of the fourth cemented lens, and in this embodiment, the specific ratio of the fifth lens group to the fourth cemented lens is f5/f501=35/88.
Specifically, the sixth lens group 6 includes a seventeenth lens 61 having negative optical power, an eighteenth lens 62 having negative optical power, a nineteenth lens 63 having positive optical power, and a twentieth lens 64 having positive optical power, which are disposed in this order from front to back, wherein the twentieth lens 64 is an aspherical lens; the sixth lens group 6 satisfies the following relationship with the seventeenth lens 61, the eighteenth lens 62, the nineteenth lens 63, and the twentieth lens 64: -1.93 < f6/f61 < -0.21, and-0.16 < f6/f62 < -0.02, and 0.15 < f6/f63 < 1.37, and 0.21 < f6/f64 < 1.85; wherein f6 is a focal length of the sixth lens group, f61 is a focal length of the seventeenth lens 61, f62 is a focal length of the eighteenth lens 62, f63 is a focal length of the nineteenth lens 63, and f64 is a focal length of the twentieth lens 64.
More specifically, in the present embodiment, the seventeenth lens 61 is a convex lens, that is, the object side surface of the seventeenth lens 61 is a plane, the image side surface is a convex surface, the eighteenth lens 62 is a concave lens, that is, the object side surface of the eighteenth lens 62 is a concave surface, the image side surface is a convex surface, the nineteenth lens 63 is a biconvex lens, the twenty-th lens 64 is a concave lens, that is, the object side surface of the twenty-th lens 64 is a concave surface, the image side surface is a convex surface, and the specific ratio of the sixth lens group to each lens therein is as follows: f6/f61= - (61/95), f6/f62= - (5/94), f6/f63=16/35, f6/f64=55/89, the optical powers of the seventeenth lens 61 to the twentieth lens 64 being in order: -35.12, -424.39, 49.32, 36.49.
Further, the seventeenth lens 61 and the eighteenth lens 62 constitute a fifth cemented lens having negative optical power, and satisfy the following conditions: -0.16 < f6/f601 < -0.02, wherein f6 is the focal length of the sixth lens group 6, f601 is the focal length of the fifth cemented lens, and in this embodiment, the specific ratio of the sixth lens group to the fifth cemented lens is f6/f601= - (5/94).
Specifically, the seventh lens group 7 includes a twenty-first lens 71 having negative optical power.
More specifically, in the present embodiment, the twenty-first lens 71 is a biconcave lens, and the optical power of the twenty-first lens 71 is-34.83.
Specifically, the zoom lens further includes a stop 8, the stop 8 being located between the fourth lens group 4 and the fifth lens group 5; the zoom lens satisfies the following conditions: L/TTL is more than 0.09 and less than 0.8; wherein L is the distance between the diaphragm 8 and the imaging surface of the zoom lens on the optical axis, and TTL is the total optical length of the zoom lens. In this embodiment, L/ttl=13/49, and the diaphragm 8 is an adjustable diaphragm 8, where the adjustable diaphragm 8 can perform a corresponding aperture scaling measure along with a change of ambient illumination intensity, and the diaphragm 8 is used to limit a light beam, so as to further improve the imaging quality of the zoom lens.
Specifically, the effective clear aperture of the first lens satisfies: wherein, For the effective clear aperture of the first lens 11, TTL is the total optical length of the zoom lens, in this embodiment, specifically
Specifically, the zoom lens satisfies the following conditions: Δ0.08 < Z1W-T/TTL < 0.71, and-0.49 < Z2W-T/TTL < -0.05, and-0.18 < Z3W-T/TTL < -0.02, wherein: Δz1w—t is the relative displacement of the front vertex of the second lens group 2 at the wide-angle end position and the telephoto end position, Δz2w—t is the relative displacement of the front vertex of the fourth lens group 4 at the wide-angle end position and the telephoto end position, Δz3w—t is the relative displacement of the front vertex of the fifth lens group 5 at the wide-angle end position and the telephoto end position, and TTL is the total optical length of the zoom lens, in this embodiment, Δz1w—t/ttl=21/89, z2w—t/ttl= - (11/68), z3w—t/ttl= - (2/33).
Specifically, the zoom lens further includes an optical filter located between the twenty-first lens 71 and the photosensitive chip 9, the optical filter being for filtering out light and stray light of unnecessary wavelength bands, thereby improving imaging quality.
Further, the zoom lens may further include a protective glass provided between the optical filter and the photosensitive chip 9 to prevent internal elements (e.g., chips) of the zoom lens from being damaged.
Based on the above, the eighth lens 24, the ninth lens 31, the tenth lens 41, and the twentieth lens 64 are all aspheric lenses, and it is understood that the aspheric lenses are characterized in that: the curvature is continuously changed from the center of the lens to the periphery of the lens, and the aspherical lens has better curvature radius characteristics, has the advantages of improving distortion aberration and astigmatism aberration, and can eliminate aberration occurring during imaging as much as possible after adopting the aspherical lens, thus improving the imaging quality of the lens.
Further, in the present embodiment, the aspherical surface shape of the aspherical lens satisfies the following condition:
in the formula, the parameter c is the curvature corresponding to the radius, r is the radial coordinate, the unit is the same as the unit of the lens length, k is a conic coefficient, the surface shape curve is hyperbolic when the k coefficient is smaller than-1, the surface shape curve is parabolic when the k coefficient is equal to-1, the surface shape curve is elliptical when the k coefficient is between-1 and 0, the surface shape curve is circular when the k coefficient is equal to 0, the surface shape curve is oblate when the k coefficient is greater than 0, and the surface shape curve is alpha 1 to alpha 8 respectively represent the coefficients corresponding to the radial coordinates. The requirement of light weight of the product is realized under the condition of ensuring that the lens has good picture requirements, the driving load is reduced, and the lens has great contribution to reducing the volume of driving components.
Specifically, in the present embodiment, parameters of the zoom lens are shown in the following table.
Parameters of each lens of the zoom lens described in Table 1
In this embodiment, the even term coefficients of the respective aspherical surfaces are shown in the following table.
The even term coefficients of the aspherical lens of the zoom lens described in Table 3
The wide-angle end focal length efl_w=9.85 mm and the telephoto end focal length efl_t=303.1 mm of the zoom; wide-angle end f-number fno_w=1.6, telephoto end f-number fno_t=5.4; wide-angle end horizontal field angle FOVH _w=61°, telephoto end field angle FOVH _t=2.1°; system optical distortion e (-5%, 2%); the total optical length of the optical system (i.e. the distance between the center vertex of the front surface of the first lens and the image plane) ttl=180 mm
The zoom imaging device adopts a five-group structure of positive and negative, and the system contains 4 glass aspheric surfaces, so that the manufacturing cost is sufficiently reduced under the conditions of realizing large image surface, large aperture, small distortion and large variable multiplying power.
Although the zoom lens uses an aspheric lens, the temperature change has little influence on the performance of the lens by limiting the focal length of the zoom lens, the back focus change is little, the performance is stable under the condition of indoor environment change, and refocusing is not needed.
In the zoom lens, as the second lens group, the fourth lens group and the fifth lens group move forwards and backwards, the focal length changes, the fourth lens group is used for focusing, the focal length (1/1.2' 16:9 CCD is an example) can change at the WIDE angle end by 9.85mm and the long focal end by 303.1mm, the shooting angle level of the WIDE angle end (WIDE) is more than 61 degrees, the optical distortion of the WIDE angle end (WIDE) and the long focal end is within 2%, and the zoom lens has the effects of WIDE angle, small distortion and large zoom.
The zoom lens uses an adjustable aperture, and has FNO. 1.6 at the wide angle end and FNO. 5.4 at the long focal end, so that the zoom lens has extremely high photosensitivity, and can still shoot clearer pictures in darker environments.
The zoom lens takes the first lens group as the highest point, the distance position between the first lens group and the image plane is fixed, and the height is smaller than 180mm (taking 1/2.8' CCD as an example).
The zoom lens can reach a resolution higher than 4K (800 ten thousand pixels), and the resolution of the center is higher than 300lp/mm, and the resolution of the periphery is higher than 1400TVline at 0.7H (70% diagonal position) by taking a sensor of 1/2.8' as an example.
The invention takes chromatic aberration into account and also takes focal power distribution into account. Based on the theory of optical chromatic aberration, part of convex lens sheets use ultra-low dispersion glass, the rest of convex lens materials are assisted by ultra-high refractive index materials to ensure optical power, and medium-high refractive index materials with excellent chromatic aberration characteristics are selected on negative lenses irregularly to optimize system chromatic aberration as much as possible. Through repeated material combination and replacement, infrared confocal of the full-focus section is truly realized.
In order to improve the imaging quality of the lens under various multiplying powers, the invention reduces various optical aberration and effectively suppresses the chromatic aberration of the system in a mode of matching the high refractive index glass with the ultra-low dispersion glass material. Different from the traditional single-die aspheric surface manufacturing process, in the zooming moving group, the aspheric surface design of a plurality of double-concave ultra-low dispersion glass materials is adopted for the first time, the chromatic aberration of peripheral visual fields is compressed by utilizing the abnormal dispersion characteristic lens of the materials, and the plurality of concave surfaces sequentially correct field curves with different multiplying powers, so that the problem that the wide-angle end and the telescopic end cannot be combined is greatly solved. The general zoom lens focuses on a group with positive focal power, and is characterized by simple focusing curve and short focusing stroke; the invention uses the structure of negative group focusing to compensate the image quality loss in close-range shooting by using a long focusing area, thereby obtaining better effect. The 4K-level color reproducibility and detail reproduction capability are achieved from the wide-angle end to either the observation at a large field angle or the capture of close-range details.
The invention also provides an imaging device, the mobile equipment comprises the zoom lens in the technical scheme, and the imaging device can be a monitoring lens without limitation.
The foregoing description is only of alternative embodiments of the present invention, and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (10)
1. The zoom lens is characterized by comprising a lens main body, wherein the direction from an object space to an image space along the optical axis of the lens main body is from front to back;
The lens main body comprises a lens barrel, a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with positive focal power, a fifth lens group with negative focal power, a sixth lens group with positive focal power, a seventh lens group with negative focal power and a photosensitive chip, wherein the first lens group, the second lens group, the fourth lens group, the fifth lens group and the sixth lens group are arranged in the lens barrel in sequence from front to back, the first lens group, the third lens group and the seventh lens group are fixedly arranged relative to the lens barrel, at least one of the second lens group, the fourth lens group and the fifth lens group moves along the optical axis so as to enable the zoom lens to zoom, and the sixth lens group moves along the optical axis so as to enable the zoom lens to focus;
Wherein the zoom lens satisfies the following conditions: 0.04 < fw/f 1< 0.38, and-2.15 < fw/f 2< -0.24, and 0.35 < fw/f3 < 0.04, and 0.1 < fw/f4 < 0.93, and-1.22 < fw/f5 < -0.14, and 0.15 < fw/f6 < 1.31, and-0.85 < fw/f7 < -0.09;
Wherein fw is a focal length of the zoom lens at a wide angle end, f1 is a focal length of the first lens group, f2 is a focal length of the second lens group, f3 is a focal length of the third lens group, f4 is a focal length of the fourth lens group, f5 is a focal length of the fifth lens group, f6 is a focal length of the sixth lens group, and f7 is a focal length of the seventh lens group.
2. The zoom lens according to claim 1, wherein the first lens group includes a first lens having positive optical power, a second lens having negative optical power, a third lens having positive optical power, and a fourth lens having positive optical power, which are disposed in this order from front to back;
The first lens group and the first lens, the second lens, the third lens and the fourth lens meet the following conditions: 0.03 < f1/f11 < 0.28, and-2.21 < f1/f12 < -0.25, and 0.11 < f1/f13 < 1.02, and 0.21 < f1/f14 < 1.91;
wherein f1 is the focal length of the first lens group, f11 is the focal length of the first lens, f12 is the focal length of the second lens, f13 is the focal length of the third lens, and f14 is the focal length of the fourth lens.
3. The zoom lens according to claim 1, wherein the second lens group includes a fifth lens having negative optical power, a sixth lens having negative optical power, a seventh lens having positive optical power, and an eighth lens having negative optical power, which are disposed in this order from front to back;
The second lens group and the fifth lens, the sixth lens, the seventh lens and the eighth lens satisfy the following conditions: 0.21 < f2/f21 < 1.91, and 0.07 < f2/f22 < 0.63, and-0.56 < f2/f23 < -0.06, and 0.05 < f2/f24 < 0.49;
Wherein f2 is the focal length of the second lens group, f21 is the focal length of the fifth lens, f22 is the focal length of the sixth lens, f23 is the focal length of the seventh lens, and f24 is the focal length of the eighth lens.
4. The zoom lens of claim 1, wherein the third lens group comprises a ninth lens having positive optical power.
5. The zoom lens according to claim 1, wherein the fourth lens group includes a tenth lens having positive optical power, an eleventh lens having positive optical power, a twelfth lens having negative optical power, and a thirteenth lens having negative optical power, which are disposed in this order from front to back;
The fourth lens group satisfies the following relationship with the tenth lens, the eleventh lens, the twelfth lens, and the thirteenth lens: 0.25 < f4/f41 < 2.21, 0.24 < f4/f42 < 2.18, and-0.18 < f4/f43 < -1.65, and 0.01 < f4/f44 < 0.11;
wherein f4 is a focal length of the fourth lens group, f41 is a focal length of the tenth lens, f42 is a focal length of the eleventh lens, f43 is a focal length of the twelfth lens, and f44 is a focal length of the thirteenth lens.
6. The zoom lens according to claim 1, wherein the fifth lens group includes a fourteenth lens having negative optical power, a fifteenth lens having negative optical power, and a sixteenth lens having negative optical power, which are disposed in this order from front to back;
the fifth lens group satisfies the following relationships with the fourteenth lens, the fifteenth lens, and the sixteenth lens: 0.19 < f5/f51 < 1.7, 0.09 < f5/f52 < 0.82, and 0.06 < f5/f53 < 0.52;
wherein f5 is a focal length of the fifth lens group, f51 is a focal length of the fourteenth lens, f52 is a focal length of the fifteenth lens, and f53 is a focal length of the sixteenth lens.
7. The zoom lens according to claim 1, wherein the sixth lens group includes a seventeenth lens having negative optical power, an eighteenth lens having negative optical power, a nineteenth lens having positive optical power, and a twentieth lens having positive optical power, which are disposed in this order from front to back;
The sixth lens group satisfies the following relationship with the seventeenth lens, the eighteenth lens, the nineteenth lens, and the twenty-eighth lens: -1.93 < f6/f61 < -0.21, and-0.16 < f6/f62 < -0.02, and 0.15 < f6/f63 < 1.37, and 0.21 < f6/f64 < 1.85;
wherein f6 is a focal length of the sixth lens group, f61 is a focal length of the seventeenth lens, f62 is a focal length of the eighteenth lens, f63 is a focal length of the nineteenth lens, and f64 is a focal length of the twentieth lens.
8. The zoom lens of claim 1, wherein the seventh lens group comprises a twenty-first lens having negative optical power.
9. The zoom lens of claim 1, further comprising a stop located between the fourth lens group and the fifth lens group;
the zoom lens satisfies the following conditions: L/TTL is more than 0.09 and less than 0.8;
Wherein L is the distance between the diaphragm and the imaging surface of the zoom lens on the optical axis, and TTL is the total optical length of the zoom lens.
10. An imaging apparatus, characterized in that the imaging apparatus comprises a zoom lens according to any one of claims 1 to 9.
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| CN115004074A (en) * | 2020-01-20 | 2022-09-02 | 株式会社尼康 | Variable magnification optical system, optical apparatus, and method for manufacturing variable magnification optical system |
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| JP2006301474A (en) * | 2005-04-25 | 2006-11-02 | Sony Corp | Zoom lens and imaging apparatus |
| TWI314217B (en) * | 2006-09-15 | 2009-09-01 | Asia Optical Co Inc | Periscope-type zooming lens |
| JP6300070B2 (en) * | 2013-02-22 | 2018-03-28 | パナソニックＩｐマネジメント株式会社 | Zoom lens system, interchangeable lens device and camera system |
| CN103235399B (en) * | 2013-05-17 | 2015-04-22 | 中山联合光电科技有限公司 | High-pixel macro-focus high-zoom-ratio zooming optical system |
| JP6586636B2 (en) * | 2015-01-21 | 2019-10-09 | パナソニックＩｐマネジメント株式会社 | Zoom lens system, interchangeable lens device and camera system |
| JP6784564B2 (en) * | 2016-10-11 | 2020-11-11 | リコーインダストリアルソリューションズ株式会社 | Projection zoom lens and projection image display device |
| WO2018185867A1 (en) * | 2017-04-05 | 2018-10-11 | 株式会社ニコン | Variable magnification optical system, optical device, and production method for variable magnification optical system |
| JP7033916B2 (en) * | 2017-12-28 | 2022-03-11 | Ｏｍデジタルソリューションズ株式会社 | Imaging optical system and an imaging device equipped with it |
| JP7149795B2 (en) * | 2018-09-28 | 2022-10-07 | 株式会社タムロン | Zoom lens and imaging device |
| CN112867953B (en) * | 2018-11-20 | 2023-03-21 | 株式会社尼康 | Variable magnification optical system and optical apparatus |
| JP7134481B2 (en) * | 2018-11-26 | 2022-09-12 | 株式会社シグマ | Variable magnification imaging optical system |
| JP7132105B2 (en) * | 2018-11-30 | 2022-09-06 | リコーインダストリアルソリューションズ株式会社 | Projection zoom lens and projection image display device |
| JP7150625B2 (en) * | 2019-01-23 | 2022-10-11 | キヤノン株式会社 | zoom lens, imaging device, lens device |
| JP7520566B2 (en) * | 2020-04-27 | 2024-07-23 | キヤノン株式会社 | Zoom lens and imaging device |
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| CN216248548U (en) * | 2021-10-29 | 2022-04-08 | 中山联合光电研究院有限公司 | Zoom lens and imaging device |
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