CN115032775A - High-resolution double-light-path zoom lens and imaging device - Google Patents

High-resolution double-light-path zoom lens and imaging device Download PDF

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Publication number
CN115032775A
CN115032775A CN202210567721.5A CN202210567721A CN115032775A CN 115032775 A CN115032775 A CN 115032775A CN 202210567721 A CN202210567721 A CN 202210567721A CN 115032775 A CN115032775 A CN 115032775A
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lens
focal length
lens group
group
positive
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Chinese (zh)
Inventor
龚俊强
欧俊星
王晓
肖明志
杨坤
刘超
沈辰弋
邱盛平
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Hangzhou Hikvision Digital Technology Co Ltd
Union Optech Co Ltd
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Hangzhou Hikvision Digital Technology Co Ltd
Union Optech Co Ltd
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Priority to CN202210567721.5A priority Critical patent/CN115032775A/en
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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
    • G02B15/145129—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 +-+++
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+

Abstract

The invention discloses a high-resolution double-light-path zoom lens and an imaging device, wherein the high-resolution double-light-path zoom lens comprises a lens main body, and the direction from an object side to an image side along the optical axis of the lens main body is from front to back; the lens main body comprises a lens cone, a fixed group and a movable group, the lens cone is arranged along the front-back direction, and a cavity is formed in the lens cone; the fixed group is fixed in the cavity and comprises a first lens group with positive focal power and a fifth lens group with positive focal power; the moving group is movably arranged in the cavity in the front-back direction, is positioned between the first lens group and the fifth lens group, and comprises a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with positive focal power, and the second lens group and the third lens group are arranged in a linkage manner; that is, by setting five lens groups and limiting the ratio of the focal length of the wide-angle end of the lens body to the focal length of each lens group, the lens body has the effects of large variable magnification, high resolution and double optical paths.

Description

High-resolution double-light-path zoom lens and imaging device
Technical Field
The invention relates to the technical field of optical lenses, in particular to a high-resolution double-light-path zoom lens and an imaging device.
Background
With the development of society, people's security awareness is constantly improved, security monitoring industry also obtains high-speed development, and the effect that the monitoring camera lens that zooms played is also bigger and bigger. Currently, the resolution of a mainstream zoom monitoring lens is 1080P, and the detail restoration capability of a monitored scene is not excellent. And when the zoom monitoring lens is in a night shooting mode, the monitoring system generally adopts active infrared supplementary lighting. Because the visible light of the monitored scene is mixed with the infrared light of the auxiliary supplementary lighting, the monitoring equipment cannot truly restore the color of the monitored scene, and the output monitoring picture is generally black and white.
Disclosure of Invention
The invention mainly aims to provide a high-resolution double-optical-path zoom lens and an imaging device, and aims to solve the problems that the existing zoom lens is low in resolution and insufficient in night shooting color restoring force.
In order to achieve the above object, the present invention provides a high resolution dual optical path zoom lens, which includes a lens body, a front-to-back direction along an optical axis of the lens body from an object side to an image side;
the lens body includes:
the lens cone is arranged along the front-back direction, and a cavity is formed in the lens cone;
the fixed group is fixed in the cavity and comprises a first lens group with positive focal power and a fifth lens group with positive focal power, which are sequentially arranged from front to back;
the moving group is movably arranged in the cavity in the front-back direction, is positioned between the first lens group and the fifth lens group, comprises a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with positive focal power which are sequentially arranged from front to back, and is in linkage arrangement with the third lens group; and the number of the first and second groups,
wherein the focal length of the lens body at the wide-angle end is f w The focal length of the first lens group is f 1 The focal length of the second lens group is f 2 A focal length f of the third lens group 3 The focal length of the fourth lens group is f 4 The focal length of the fifth lens group is f 5 And satisfies the following relation:
Figure BDA0003657138930000021
Figure BDA0003657138930000022
optionally, the first lens group includes a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with positive focal power, and a fifth lens with positive focal power, which are sequentially arranged from front to back;
wherein the focal length of the first lens group is f 1 The focal length of the first lens is f 11 The focal length of the second lens is f 12 A focal length f of the third lens 13 A focal length f of the fourth lens 14 A focal length f of the fifth lens 15 The following relational expression is satisfied:
Figure BDA0003657138930000023
Figure BDA0003657138930000024
optionally, the first lens has an effective clear aperture of Φ L11 The total optical length of the lens body is TTL, and
Figure BDA0003657138930000025
optionally, the second lens group includes a sixth lens with negative focal power, a seventh lens with negative focal power, an eighth lens with positive focal power, and a ninth lens with negative focal power, which are arranged in sequence from front to back;
wherein the focal length of the second lens group is f 2 A focal length f of the sixth lens 21 A focal length f of the seventh lens 22 A focal length f of the eighth lens 23 The focal length of the ninth lens is f 24 The following relational expression is satisfied:
Figure BDA0003657138930000026
optionally, the third lens group comprises a tenth lens with positive focal power, an eleventh lens with positive focal power, a twelfth lens with positive focal power and a thirteenth lens with negative focal power which are arranged in sequence from front to back;
wherein the focal length of the third lens group is f 3 A focal length of the tenth lens is f 31 A focal length f of the eleventh lens 32 A focal length f of the twelfth lens 33 A focal length f of the thirteenth lens 34 The following relational expression is satisfied:
Figure BDA0003657138930000031
optionally, the fourth lens group includes a fourteenth lens having positive optical power.
Optionally, the fifth lens group comprises a fifteenth lens with negative focal power, a sixteenth lens with positive focal power, a seventeenth lens with positive focal power and an eighteenth lens with negative focal power, which are arranged in sequence from front to back;
wherein the focal length of the fifth lens group is f 5 A focal length f of the fifteenth lens 51 A focal length f of the sixteenth lens 52 A focal length f of the seventeenth lens 53 The focal length of the eighteenth lens is f 54 The following relational expression is satisfied:
Figure BDA0003657138930000032
optionally, the second lens group is movable from front to back to enable the lens body to be adjusted from a wide angle end to a telephoto end, and a relative displacement amount of a front vertex of the second lens group when the lens body is at the wide angle end and the telephoto end is Δ Z1 W-T The total optical length of the lens body is TTL, and
Figure BDA0003657138930000033
and/or the presence of a gas in the gas,
the third lens group is movable from back to front so as to adjust the lens body from a wide angle end to a telephoto end, and a relative displacement amount of a front vertex of the third lens group when the lens body is at the wide angle end and the telephoto end is Δ Z2 W-T The total optical length of the lens body is TTL, and
Figure BDA0003657138930000034
optionally, the high-resolution dual-optical-path zoom lens further includes a diaphragm disposed in the cavity, and the diaphragm is disposed between the second lens group and the third lens group; and/or the presence of a gas in the gas,
the high-resolution double-light-path zoom lens further comprises a light splitting element arranged in the cavity, and the light splitting element is positioned on the rear side of the fifth lens group.
The invention also provides an imaging device which comprises the high-resolution double-light-path zoom lens.
In the present invention, the first lens group and the fifth lens group are fixedly mounted in the inner cavity, the second lens group, the third lens group and the fourth lens group are provided in the inner cavity and movable in the forward and backward directions, wherein the second lens group and the third lens group are used for zooming, the fourth lens group is used for focusing, the lens body can be zoomed from the wide angle end to the telephoto end in the linkage process of the second lens group and the third lens group, and the fourth lens group can move and focus corresponding to the positions, the imaging wavelengths and the imaging object distances of the second lens group and the third lens group in the forward and backward directions in the movement process of the fourth lens group relative to the second lens group and the third lens group, so that the lens body can keep clear imaging in the zooming process, meanwhile, the first lens group has positive focal power, the second lens group has negative focal power, the third lens group has positive focal power, the fourth lens group has positive focal power, and the fifth lens group has positive focal power, and the first lens group to the fifth lens group are sequentially arranged from front to back, and the ratio of the focal length of the lens body at the wide-angle end to the focal length of each lens group is limited, so that the lens body has the effects of large variable magnification, high resolution and double optical paths.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments and/or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a high-resolution dual-optical-path zoom lens (at a wide-angle end) provided by the present invention;
FIG. 2 is a spherical aberration diagram of the high resolution dual optical path zoom lens of FIG. 1 at the wide-angle end;
FIG. 3 is a curvature of field of the high resolution dual optical path zoom lens of FIG. 1 at the wide-angle end;
FIG. 4 is a distortion diagram of the high resolution dual optical path zoom lens of FIG. 1 at the wide-angle end;
FIG. 5 is a schematic structural diagram of a high-resolution dual-optical path zoom lens (at intermediate magnification) according to the present invention;
FIG. 6 is a spherical aberration diagram at intermediate magnification for the high resolution dual optical path zoom lens of FIG. 5;
FIG. 7 is a field curvature diagram at intermediate magnification for the high resolution dual optical path zoom lens of FIG. 5;
FIG. 8 is a distortion plot of the high resolution dual optical path zoom lens of FIG. 5 at intermediate magnification;
FIG. 9 is a schematic structural diagram of a high-resolution dual-optical path zoom lens (at the telephoto end) according to the present invention;
FIG. 10 is a spherical aberration diagram of the high resolution dual optical path zoom lens of FIG. 9 at the telephoto end;
FIG. 11 is a curvature of field diagram of the high resolution dual optical path zoom lens of FIG. 9 at the telephoto end;
fig. 12 is a distortion diagram of the high-resolution dual-optical path zoom lens in fig. 9 at the telephoto end.
The embodiment of the invention is illustrated by reference numerals:
reference numerals Name (R) Reference numerals Name (R)
1000 High-resolution double-light-path zoom lens 34 Thirteenth lens
100 Lens body 4 The fourth lens group
1 A first lens group 41 Fourteenth lens element
11 First lens 5 The fifth lens group
12 Second lens 51 Fifteenth lens element
13 Third lens 52 Sixteenth lens
14 Fourth lens 53 Seventeenth lens
15 Fifth lens element 54 Eighteenth lens
2 The second lens group 6 Diaphragm
21 Sixth lens element 7 Photosensitive chip
22 Seventh lens element 71 First photosensitive chip
23 Eighth lens element 72 Second photosensitive chip
24 Ninth lens 8 Light splitting element
3 Third lens group 9 Optical filter
31 Tenth lens 91 First optical filter
32 Eleventh lens 92 Second optical filter
33 Twelfth lens element
The implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used for explaining the relative position relationship between the components, the motion situation, and the like under a certain posture (as shown in the drawing), and if the certain posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "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 relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B", including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Along with the development of society, people's safety precaution consciousness is constantly improved, and security protection monitoring industry also obtains high-speed development, and the effect that the monitoring camera lens that zooms played is also bigger and bigger. Currently, the resolution of a mainstream zoom monitoring lens is 1080P, and the detail restoration capability of a monitored scene is not excellent. And when the zoom monitoring lens is in a night shooting mode, the monitoring system generally adopts active infrared supplementary lighting. Because the visible light of the monitored scene is mixed with the infrared light of the auxiliary supplementary lighting, the monitoring equipment cannot truly restore the color of the monitored scene, and the output monitoring picture is generally black and white.
In view of this, the present invention provides a high-resolution dual-optical-path zoom lens and an imaging device, which are used to solve the problems of low resolution and insufficient color reduction capability in night photographing of the conventional zoom lens. Fig. 1 to 12 show an embodiment of a high-resolution dual-optical-path zoom lens according to the present invention.
Referring to fig. 1 to 12, in the present embodiment, the high resolution dual optical path zoom lens 1000 includes a lens body 100, and a front-to-back direction is along an optical axis of the lens body 100 from an object side to an image side; the lens body 100 includes a lens barrel (not shown), a fixed group, and a movable group, the lens barrel is disposed in a front-back direction, and a cavity is formed in the lens barrel; the fixingThe group is fixed in the cavity and comprises a first lens group 1 with positive focal power and a fifth lens group 5 with positive focal power which are sequentially arranged from front to back; the moving group is movably arranged in the cavity in the front-back direction, is positioned between the first lens group 1 and the fifth lens group 5, comprises a second lens group 2 with negative focal power, a third lens group 3 with positive focal power and a fourth lens group 4 with positive focal power which are sequentially arranged from front to back, and the second lens group 2 and the third lens group 3 are arranged in a linkage manner; wherein the focal length of the lens body 100 at the wide-angle end is f w The focal length of the first lens group 1 is f 1 The focal length of the second lens group 2 is f 2 A focal length f of the third lens group 3 3 The focal length of the fourth lens group 4 is f 4 The focal length of the fifth lens group 5 is f 5 The following relational expression is satisfied:
Figure BDA0003657138930000071
Figure BDA0003657138930000072
in the technical solution of the present invention, the first lens group 1 and the fifth lens group 5 are fixedly mounted in the inner cavity, the second lens group 2, the third lens group 3, and the fourth lens group 4 are disposed in the inner cavity and movable in the forward and backward directions, wherein the second lens group 2 and the third lens group 3 are used for zooming, the fourth lens group 4 is used for focusing, the lens body 100 can be zoomed from the wide-angle end to the telephoto end in the linkage process of the second lens group 2 and the third lens group 3, and the fourth lens group 4 can move and focus corresponding to the positions of the second lens group 2 and the third lens group 3, the imaging wavelength, and the imaging object distance in the forward and backward directions in the movement process of the second lens group 2 and the third lens group 3, so that the lens body 100 can keep imaging clarity in the zooming process, meanwhile, the first lens group 1 has positive focal power, the second lens group 2 has negative focal power, the third lens group 3 has positive focal power, the fourth lens group 4 has positive focal power, and the fifth lens group 5 has positive focal power, and by arranging the first lens group 1 to the fifth lens group 5 in sequence from front to back and limiting the ratio of the focal length of the lens body 100 at the wide-angle end to the focal length of each lens group, the lens body 100 can have the effects of large variable magnification, high resolution, and dual optical paths.
The second lens group 2, the third lens group 3, and the fourth lens group 4 can move back and forth after being driven by external force, wherein the external force may be driven by a driving motor, or manually adjusted without limitation.
Specifically, in the present embodiment, the focal length of the lens body 100 at the wide-angle end is f w The focal length of the first lens group 1 is f 1 The focal length of the second lens group 2 is f 2 A focal length f of the third lens group 3 3 The focal length of the fourth lens group 4 is f 4 The focal length of the fifth lens group 5 is f 5 Wherein, in the process,
Figure BDA0003657138930000073
in the present invention, the first lens group 1 includes a first lens 11 having a negative refractive power, a second lens 12 having a positive refractive power, a third lens 13 having a positive refractive power, a fourth lens 14 having a positive refractive power, and a fifth lens 15 having a positive refractive power, which are arranged in this order from front to back; wherein the focal length of the first lens group 1 is f 1 The focal length of the first lens 11 is f 11 The focal length of the second lens 12 is f 12 The focal length of the third lens 13 is f 13 The focal length of the fourth lens 14 is f 14 The focal length of the fifth lens 15 is f 15 The following relational expression is satisfied:
Figure BDA0003657138930000081
Figure BDA0003657138930000082
more specifically, in the present embodiment, the first lens 11 is configured as a convex-concave spherical lens having negative optical power, that is, the object-side surface of the first lens 11 is a convex surface, and the image-side surface thereof is a concave surface, the second lens 12 is configured as a convex-concave spherical lens having positive optical power, and the third lens 13 is configured as a convex-flat spherical lens having positive optical power; the fourth lens 14 is a convex-concave spherical lens with positive focal power, the fifth lens 15 is a convex-concave spherical lens with positive focal power, and the focal length of the first lens group 1 is f 1 The focal length of the first lens 11 is f 11 The focal length of the second lens 12 is f 12 The focal length of the third lens 13 is f 13 The focal length of the fourth lens 14 is f 14 A focal length f of the fifth lens 15 15 Wherein, in the step (A),
Figure BDA0003657138930000083
meanwhile, in the present embodiment, the first lens 11 is cemented with the second lens 12 to form a first cemented lens. The refractive index of the first lens 11 is ND 11 The refractive index of the second lens 12 is ND 12 The refractive index of the third lens 13 is ND 13 The refractive index of the fourth lens 14 is ND 14 The refractive index of the fifth lens 15 is ND 15 The abbe number of the first lens 11 is VD 11 The abbe number of the second lens 12 is VD 12 The abbe number of the third lens 13 is VD 13 The Abbe number of the fourth lens 14 is VD 14 The Abbe number of the fifth lens 15 is VD 15 And satisfies the following relation:
1.7<ND 11 <2.0，1.4<ND 12 <1.7，1.4<ND 13 <1.7，1.4<ND 14 <1.7，1.4<ND 15 <1.7；20<VD 11 <40, and 60 of<VD 12 <100，60<VD 13 <100，60<VD 14 <100，60<VD 15 <100。
Specifically, the second lens group 2 includes a sixth lens 21 having a negative power, a seventh lens 22 having a negative power, an eighth lens 23 having a positive power, and a ninth lens 24 having a negative power, which are arranged in this order from front to back; wherein the focal length of the second lens group 2 is f 2 The focal length of the sixth lens 21 is f 21 A focal length f of the seventh lens 22 22 A focal length f of the eighth lens 23 23 A focal length f of the ninth lens 24 24 The following relational expression is satisfied:
Figure BDA0003657138930000084
more specifically, in the present embodiment, the sixth lens 21 is provided as a convex-concave spherical lens having negative refractive power, the seventh lens 22 is provided as an aspherical lens, the eighth lens 23 is provided as a convex-concave spherical lens having positive refractive power, the ninth lens 24 is provided as an aspherical spherical lens, and the focal length of the second lens group 2 is f 2 The focal length of the sixth lens 21 is f 21 A focal length f of the seventh lens 22 22 A focal length f of the eighth lens 23 23 A focal length f of the ninth lens 24 24 And is and
Figure BDA0003657138930000091
Figure BDA0003657138930000092
specifically, the third lens group 3 includes, in order from front to back, a tenth lens 31 having positive optical power, an eleventh lens 32 having positive optical power, a twelfth lens 33 having positive optical power, and a thirteenth lens 34 having negative optical power; wherein the focal length of the third lens group 3 is f 3 Focal length of the tenth lens 31Is f 31 A focal length f of the eleventh lens 32 32 A focal length f of the twelfth lens element 33 33 A focal length f of the thirteenth lens 34 34 The following relational expression is satisfied:
Figure BDA0003657138930000093
meanwhile, in the embodiment of the present invention, the twelfth lens 33 and the thirteenth lens 34 form a second cemented lens by cementing.
More specifically, in the present embodiment, the tenth lens 31 is provided as a biconvex aspherical lens having positive power, the eleventh lens 32 is provided as a biconvex spherical lens having positive power, the twelfth lens 33 is provided as a biconvex spherical lens having positive power, the thirteenth lens 34 is provided as a biconcave spherical lens having negative power, and the focal length f of the third lens group 3 is 3 The tenth lens 31 has a focal length f 31 A focal length f of the eleventh lens 32 32 A focal length f of the twelfth lens element 33 33 A focal length f of the thirteenth lens 34 34 And is made of
Figure BDA0003657138930000094
Figure BDA0003657138930000095
Specifically, the fourth lens group 4 includes a fourteenth lens 41 having positive optical power.
Specifically, the fifth lens group 5 includes a fifteenth lens 51 having a negative optical power, a sixteenth lens 52 having a positive optical power, a seventeenth lens 53 having a positive optical power, and an eighteenth lens 54 having a negative optical power, which are arranged in this order from front to back; wherein the focal length of the fifth lens group 5 is f 5 A focal length f of the fifteenth lens 51 51 The focal length of the sixteenth lens 52 is f 52 A focal length f of the seventeenth lens 53 53 A focal length f of the eighteenth lens 54 54 The following relational expression is satisfied:
Figure BDA0003657138930000096
more specifically, in the present embodiment, the fifteenth lens 51 is provided as a biconcave aspheric lens having a negative refractive power, the sixteenth lens 52 is provided as a biconvex spherical lens having a positive refractive power, the seventeenth lens 53 is provided as a meniscus lens having a positive refractive power, the eighteenth lens 54 is provided as a meniscus lens having a negative refractive power, and the focal length f of the fifth lens group 5 is 5 A focal length f of the fifteenth lens 51 51 The focal length of the sixteenth lens 52 is f 52 The seventeenth lens 53 has a focal length f 53 A focal length f of the eighteenth lens 54 54 And is and
Figure BDA0003657138930000101
Figure BDA0003657138930000102
specifically, the first lens group 1 includes a first lens 11 having negative optical power, a second lens 12 having positive optical power, a third lens 13 having positive optical power, a fourth lens 14 having positive optical power, and a fifth lens 15 having positive optical power, which are arranged in this order from front to back; the effective clear aperture of the first lens 11 is phi L11 The total optical length of the lens body 100 is TTL, and
Figure BDA0003657138930000103
more specifically, in the present embodiment, the effective clear aperture of the first lens 11 is Φ L11 The total optical length of the lens body 100 is TTL, and
Figure BDA0003657138930000104
in the present invention, the second lens group 2 is movable from front to back so as to be able to adjust the lens body 100 from a wide angle end to a telephoto end, and a relative displacement amount of a front vertex of the second lens group 2 when the lens body 100 is at the wide angle end and the telephoto end is Δ Z1 W-T The total optical length of the lens body 100 is TTL, and
Figure BDA0003657138930000105
in the present invention, the third lens group 3 is movable from the rear to the front so as to adjust the lens body 100 from the wide angle end to the telephoto end, and a relative displacement amount of a front vertex of the third lens group 3 when the lens body 100 is at the wide angle end and the telephoto end is Δ Z2 W-T The total optical length of the lens body 100 is TTL, and
Figure BDA0003657138930000106
specifically, in the present embodiment, the two technical features are provided at the same time, that is, the relative displacement amount between the front vertex of the second lens group 2 when the lens body 100 is at the wide-angle end position and the front vertex of the lens body 100 when the lens body 100 is at the telephoto end position is Δ Z1 W-T The total optical length of the lens body 100 is TTL, and
Figure BDA0003657138930000107
the relative displacement between the front vertex of the third lens group 3 when the lens body 100 is at the wide-angle end position and the lens body 100 is at the telephoto end position is Δ Z2 W-T The total optical length of the lens body 100 is TTL, and
Figure BDA0003657138930000108
more specifically, in the present embodiment, the front vertex of the second lens group 2 comes into contact with the lens body 100 when the lens body 100 is at the wide-angle end positionThe relative displacement amount when the head main body 100 is at the telescopic end position is Δ Z1 W-T A relative displacement amount between a front vertex of the third lens group 3 when the lens body 100 is at the wide-angle end position and a front vertex of the third lens group 3 when the lens body 100 is at the telephoto end position is Δ Z2 W-T The total optical length of the lens body 100 is TTL, and
Figure BDA0003657138930000111
in the present invention, the high resolution dual optical path zoom lens 1000 further includes a diaphragm 6 disposed in the cavity, the diaphragm 6 is located between the second lens group 2 and the third lens group 3, the diaphragm 6 is an adjustable diaphragm, and the adjustable diaphragm can perform corresponding measures for zooming the diaphragm 6 along with the change of the ambient light intensity; the position of the diaphragm 6 and the size of the light-transmitting hole have a direct relationship with the brightness, the definition and the size of partial aberration of the image formed by the lens body 100, and the diaphragm 6 is arranged between the second lens group 2 and the third lens group 3, so that the lens body 100 can achieve the brightness and the definition of the image which are more suitable in the zooming process.
In the present invention, the high-resolution dual-optical path zoom lens 1000 further includes a light splitting element 8 disposed in the cavity, and the light splitting element 8 is located at the rear side of the fifth lens group 5; the light splitting element 8 is also a light splitter, which is a passive device, also called an optical splitter, and does not require external energy as long as there is input light. The beam splitter consists of entrance and exit slits, a mirror and a dispersive element, and has the function of separating out the required resonance absorption lines.
It should be noted that the two technical features may be set alternatively or simultaneously, specifically, in this embodiment, the two technical features are set simultaneously, that is, the high-resolution dual-optical-path zoom lens 1000 further includes a diaphragm 6 and a light splitting element 8 which are disposed in the cavity, where the diaphragm 6 is located between the second lens group 2 and the third lens group 3, and the light splitting element 8 is located at the rear side of the fifth lens group 5; the diaphragm 6 is arranged between the second lens group 2 and the third lens group 3, so that the lens body 100 can achieve a suitable imaging brightness degree and definition in the zooming process; and the light splitting element 8 is arranged to separate out the required resonance absorption lines.
It should be noted that, the smaller the light-passing hole of the diaphragm 6, the smaller the spherical aberration, the sharper the image, the larger the depth of field, but the weaker the brightness of the image; conversely, the larger the light-passing hole of the diaphragm 6 is, the stronger the brightness of the image is, the larger the rice spherical aberration is, the worse the relative definition is, and the smaller the depth of field is. Therefore, in this embodiment, the light passing hole of the diaphragm 6 may be set to a fixed size, or may be set to be adjustable within a certain size range.
In order to ensure the brightness, the sharpness and the magnitude of partial aberration of the image formed by the high-resolution dual-optical-path zoom lens 1000, the distance from the stop 6 to the imaging plane of the lens body 100 in the front-back direction is L, the total optical length of the lens body 100 is TTL, and the following relations are satisfied:
Figure BDA0003657138930000112
the total optical length is a distance from a vertex of the center of the object side surface of the first lens element 11 to the image plane of the lens body 100.
Specifically, in the present embodiment, the distance from the diaphragm 6 to the imaging surface of the lens body 100 in the front-rear direction is L, the total optical length of the lens body 100 is TTL, and
Figure BDA0003657138930000121
it should be noted that the high-resolution dual-optical-path zoom lens 1000 further includes an optical filter 9 and a photosensitive chip 7, which are disposed on the rear side of the fifth lens group 5, and a surface of the photosensitive chip 7 facing the object side is an imaging surface.
Specifically, the light splitting element 8 is configured to separate a visible light path from an infrared light path, and the high-resolution dual-light-path zoom lens 1000 further includes a first light sensing chip 71, a second light sensing chip 72, a first light filter 91, and a second light filter 92, where the first light filter 91 and the first light sensing chip 71 are located at a rear side of the light splitting element 8, and the second light filter 92 and the second light sensing chip 72 are located at an upper side of the light splitting element 8, so that visible light and infrared light are respectively imaged on the first light sensing chip 71 and the second light sensing chip 72.
Specifically, the imaging surface may be a surface of the light-sensing chip 7 facing the object side, that is, a surface of an image pickup device such as a CCD or a CMOS, and more specifically, in the present embodiment, the imaging surface is a surface of a CMOS solid-state image pickup device (in the present embodiment, the size of a CMOS is 1/1.8 "inch H V is 7.68mm x 4.32mm), and it is understood that light rays carrying object information can sequentially pass through the first lens group 1, the second lens group 2, the diaphragm 6, the third lens group 3, the fourth lens group 4, the fifth lens group 5, the light-splitting element 8, the first optical filter 91, and the second optical filter 92, and be split into visible light and infrared light, and finally correspond to and image on the first light-sensing chip 71 and the second light-sensing chip 72, respectively.
Specifically, in this embodiment, the parameters of the high-resolution dual-optical path zoom lens 1000 are as follows: the focal length fw at the wide-angle end is 6.86mm, and the focal length ft at the telephoto end is 137.52 mm; diaphragm number Fno at wide angle end w 1.6, telescope end f-number Fno T 3.8; the optical distortion range is between-8% and 2.5%; the total optical length TTL of the zoom lens is 142.2 mm.
Specifically, in this embodiment, the refractive index, the radius of curvature, and the thickness interval of the lens material are shown in the following table:
TABLE 1 parameters of the lenses
Figure BDA0003657138930000122
Figure BDA0003657138930000131
Figure BDA0003657138930000141
In this embodiment, the seventh lens 22, the ninth lens 24, the tenth lens 31, the fifteenth lens 51, and the eighteenth lens 54 are aspheric lenses; it should be noted that the aspheric lens has the following characteristics: the curvature is continuously changed from the lens center to the lens periphery, and the aspheric lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatic aberration, and after the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, so that the imaging quality of the lens is improved.
Further, in the present embodiment, the aspherical surface shape of the aspherical lens satisfies the following condition:
Figure BDA0003657138930000142
where c is the curvature corresponding to the radius, y is the radial coordinate (the unit is the same as the unit of the lens length), k is the conic coefficient, (when the k coefficient is smaller than-1, the surface curve is hyperbolic curve, when the k coefficient is equal to-1, the curve is parabolic curve, when the k coefficient is between-1 and 0, the curve is elliptic curve, when the k coefficient is equal to 0, the curve is circular, when the k coefficient is greater than 0, the curve is oblate) A, B, C, D, E, F is the high-order aspheric coefficient (please refer to table 2 below), and the shape and size of the aspheric object-side surface and the image-side surface of the lens can be set by the above parameters.
TABLE 2 Cone and aspheric coefficients for aspheric lenses
Figure BDA0003657138930000143
TABLE 3 zoom lens at wide angle end, intermediate magnification position, and telephoto end
Figure BDA0003657138930000144
Figure BDA0003657138930000151
In the present invention, the zoom lens adopts a five-group structure of "positive, negative, positive and positive", including two zoom groups, a focusing group and two fixed groups, the focal length changes with the corresponding movement of the second lens group 2 and the third lens group 3, and the fourth lens group 4 is used for focusing, specifically, taking 1/1.8 ", 16:9 photosensitive chips as an example, the focal length can reach 6.86mm at the wide-angle end and 137.5mm at the telephoto end.
The light splitting element 8 separates a visible light path from an infrared light path, so that visible light and infrared light are imaged on different imaging surfaces respectively, and then a colorful picture is shot in a night environment through software processing.
The lens body 100 uses an adjustable diaphragm, and the diaphragm number reaches 1.6 at the wide-angle end and 3.8 at the telephoto end.
The distance between the first lens group 1 and the photosensitive chip 7 is fixed, the distance between the first lens group 1 and the photosensitive chip 7 can be adjusted according to the size of the photosensitive chip actually selected, and taking 1/1.8 ", 16:9 photosensitive chips as an example, the distance between the first lens group 1 and the photosensitive chip 7 is 142.2 mm.
The zoom lens can achieve the resolution higher than 4K (800 ten thousand pixels), the central resolution is higher than 1800TVline, and the peripheral 0.7H (70% diagonal position) resolution is higher than 1600 TVline.
In addition, the invention also provides an imaging device, which comprises the high-resolution dual-optical-path zoom lens 1000 according to the technical scheme. It should be noted that, for the detailed structure of the high-resolution dual-optical-path zoom lens 1000 in the imaging device, reference may be made to the embodiment of the high-resolution dual-optical-path zoom lens 1000, which is not described herein again; since the imaging device of the present invention uses the high-resolution dual-optical-path zoom lens 1000, the embodiment of the imaging device of the present invention includes all technical solutions of all embodiments of the high-resolution dual-optical-path zoom lens 1000, and the achieved technical effects are also completely the same, and are not described herein again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the specification and drawings, or any other related technical fields, which are directly or indirectly applied to the present invention, are included in the scope of the present invention.

Claims (10)

1. The high-resolution double-light-path zoom lens is characterized by comprising a lens main body, wherein the direction from an object side to an image side along the optical axis of the lens main body is from front to back;
the lens body includes:
the lens cone is arranged along the front-back direction, and a cavity is formed in the lens cone;
the fixed group is fixed in the cavity and comprises a first lens group with positive focal power and a fifth lens group with positive focal power, which are sequentially arranged from front to back;
the moving group is movably arranged in the cavity in the front-back direction, is positioned between the first lens group and the fifth lens group, comprises a second lens group with negative focal power, a third lens group with positive focal power and a fourth lens group with positive focal power which are sequentially arranged from front to back, and is in linkage arrangement with the third lens group; and the number of the first and second groups,
wherein the focal length of the lens body at the wide-angle end is f w The focal length of the first lens group is f 1 The focal length of the second lens group is f 2 A focal length f of the third lens group 3 The focal length of the fourth lens group is f 4 The focal length of the fifth lens group is f 5 The following relational expression is satisfied:
Figure FDA0003657138920000011
2. the high resolution dual optical path zoom lens according to claim 1, wherein the first lens group comprises a first lens having a negative optical power, a second lens having a positive optical power, a third lens having a positive optical power, a fourth lens having a positive optical power, and a fifth lens having a positive optical power, which are arranged in this order from front to back;
wherein the focal length of the first lens group is f 1 The focal length of the first lens is f 11 A focal length f of the second lens 12 A focal length f of the third lens 13 The focal length of the fourth lens is f 14 A focal length f of the fifth lens 15 The following relational expression is satisfied:
Figure FDA0003657138920000012
3. the high resolution dual optical path zoom lens of claim 2, wherein the first lens has an effective clear aperture of Φ L11 The total optical length of the lens body is TTL, and
Figure FDA0003657138920000021
4. the high resolution dual optical path zoom lens according to claim 1, wherein the second lens group comprises a sixth lens having a negative optical power, a seventh lens having a negative optical power, an eighth lens having a positive optical power, and a ninth lens having a negative optical power, which are arranged in this order from front to back;
wherein the focal length of the second lens group is f 2 A focal length f of the sixth lens 21 A focal length f of the seventh lens 22 A focal length f of the eighth lens 23 The focal length of the ninth lens is f 24 The following relational expression is satisfied:
Figure FDA0003657138920000022
5. the high resolution dual optical path zoom lens according to claim 1, wherein the third lens group comprises a tenth lens having positive optical power, an eleventh lens having positive optical power, a twelfth lens having positive optical power, and a thirteenth lens having negative optical power, which are arranged in this order from front to back;
wherein the focal length of the third lens group is f 3 A focal length of the tenth lens is f 31 A focal length f of the eleventh lens 32 A focal length f of the twelfth lens 33 A focal length f of the thirteenth lens 34 The following relational expression is satisfied:
Figure FDA0003657138920000023
6. the high resolution dual optical path zoom lens of claim 1, wherein the fourth lens group comprises a fourteenth lens having positive optical power.
7. The high resolution dual optical path zoom lens according to claim 1, wherein the fifth lens group comprises a fifteenth lens with negative optical power, a sixteenth lens with positive optical power, a seventeenth lens with positive optical power and an eighteenth lens with negative optical power, which are arranged in sequence from front to back;
wherein the focal length of the fifth lens group is f 5 A focal length f of the fifteenth lens 51 The first mentionedThe focal length of the sixteen lenses is f 52 A focal length f of the seventeenth lens 53 A focal length f of the eighteenth lens 54 The following relational expression is satisfied:
Figure FDA0003657138920000031
8. the high resolution twin optical path zoom lens according to claim 1, wherein the second lens group is movable from front to rear to enable the lens body to be adjusted from a wide angle end to a telephoto end, and a relative displacement amount of a front vertex of the second lens group when the lens body is at the wide angle end and the telephoto end is Δ Z1 W-T The total optical length of the lens body is TTL, and
Figure FDA0003657138920000032
and/or the presence of a gas in the gas,
the third lens group is movable from back to front so as to adjust the lens body from a wide angle end to a telephoto end, and a relative displacement amount of a front vertex of the third lens group when the lens body is at the wide angle end and the telephoto end is Δ Z2 W-T The total optical length of the lens body is TTL, and
Figure FDA0003657138920000033
9. the high resolution dual optical path zoom lens of claim 1, further comprising a stop disposed in the cavity, the stop being between the second lens group and the third lens group; and/or the presence of a gas in the atmosphere,
the high-resolution double-light-path zoom lens further comprises a light splitting element arranged in the cavity, and the light splitting element is positioned on the rear side of the fifth lens group.
10. An imaging apparatus comprising the high resolution dual optical path zoom lens according to any one of claims 1 to 9.
CN202210567721.5A 2022-05-23 2022-05-23 High-resolution double-light-path zoom lens and imaging device Pending CN115032775A (en)

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