CN110174755A - A kind of zoom lens - Google Patents

A kind of zoom lens Download PDF

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Publication number
CN110174755A
CN110174755A CN201910570171.0A CN201910570171A CN110174755A CN 110174755 A CN110174755 A CN 110174755A CN 201910570171 A CN201910570171 A CN 201910570171A CN 110174755 A CN110174755 A CN 110174755A
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CN
China
Prior art keywords
lens
zoom
focal length
compensation
positive light
Prior art date
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Pending
Application number
CN201910570171.0A
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Chinese (zh)
Inventor
张品光
何剑炜
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Dongguan Yutong Optical Technology Co Ltd
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Dongguan Yutong Optical Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by Dongguan Yutong Optical Technology Co Ltd filed Critical Dongguan Yutong Optical Technology Co Ltd
Priority to CN201910570171.0A priority Critical patent/CN110174755A/en
Publication of CN110174755A publication Critical patent/CN110174755A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B15/00Optical objectives with means for varying the magnification
    • G02B15/14Optical 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
    • G02B15/16Optical 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
    • G02B15/177Optical 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 negative front lens or group of lenses

Abstract

The embodiment of the invention discloses a kind of zoom lens.The camera lens includes the compensation lens group of the negative power arranged from the object side to the image side along optical axis and the Zoom lens group of positive light coke, and compensation lens group and Zoom lens group are moved back and forth along optical axis when zooming;Compensation lens group includes the first lens, the second lens of negative power and the third lens of positive light coke for the negative power being arranged successively from the object side to the image side;Zoom lens group includes the 7th lens, the 8th lens of negative power and the 9th lens of positive light coke of the 4th lens of the positive light coke being arranged successively from the object side to the image side, the 5th lens of positive light coke, the 6th lens of negative power, positive light coke.Zoom lens provided in an embodiment of the present invention, its focal length zoom ratio is greater than 4, and using coke is not run in the environment of -40 DEG C~80 DEG C, field angle variation range is wide, visible light can be achieved and infrared light is confocal and imaging definition and resolution ratio are in 4K or more, maximum ring is up to F1.3.

Description

A kind of zoom lens
Technical field
The present embodiments relate to optical lens technology more particularly to a kind of zoom lens.
Background technique
Since the field angle of tight shot is fixed, a product can be only applied to special scenes, cause under many scenes Tight shot is unable to satisfy requirement.Zoom lens is due to focal length continuous variable, and field angle is also continuous in a certain range Variable, more kinds of application scenarios are suitable for, thus increasingly favored by market.And there is 4K (3840 × 2160) resolution ratio Camera due to the clarity with superelevation, it is high to monitored picture details reduction degree, therefore obtain in safety-security area very big Concern and application.
Wide-angle zoom lens are the common lens types of safety defense monitoring system, at present its resolution of the wide-angle zoom lens of mainstream Rate focuses primarily upon this section of three mega pixels to six mega pixels, and the type that can meet 4K requirement is few, and usually Higher cost is difficult to large-scale popularization.
Summary of the invention
The embodiment of the present invention provides a kind of zoom lens, to realize a kind of large aperture ultra-wide angle ultra high-definition zoom of low cost The design of camera lens, focal length zoom ratio are greater than 4, use in the environment of -40 DEG C~80 DEG C and do not run coke, field angle variation range Extensively, it can be achieved that visible light is confocal with infrared light and imaging definition and resolution ratio are in 4K or more, maximum ring is comprehensive up to F1.3 Conjunction is had excellent performance.
The embodiment of the present invention provides a kind of zoom lens, including the benefit of the negative power arranged from the object side to the image side along optical axis The Zoom lens group of lens group and positive light coke is repaid, the compensation lens group and the Zoom lens group are when zooming along the light Axis moves back and forth;
The compensation lens group includes the first lens of the negative power being arranged successively from the object side to the image side, negative power The third lens of second lens and positive light coke;
The Zoom lens group includes the 4th lens, the positive light coke for the positive light coke being arranged successively from the object side to the image side 5th lens, the 6th lens of negative power, the 7th lens of positive light coke, negative power the 8th lens and positive light coke The 9th lens;
The focal length of the compensation lens group and the focal length of the Zoom lens group meet following relational expression:
0.7<∣Ff'/Bf'∣<1.1;
Second lens, the third lens, the 5th lens, the 6th lens and the 9th lens coke Focal length away from focal length and the Zoom lens group with the compensation lens group meets following relational expression:
1<∣f2/Ff'∣<4;
1.2<∣f3/Ff'∣<6.1;
1.2<∣f5/Bf'∣<3.8;
0.9<∣f6/Bf'∣<2.5;
4<∣f9/Bf'∣<35;
0.7<∣f5/f6∣<1.8;
Wherein, f2, f3, f5, f6 and f9 respectively indicate second lens, the third lens, the 5th lens, institute The focal length of the 6th lens and the 9th lens is stated, Ff' indicates that the focal length of the compensation lens group, Bf' indicate that the zoom is saturating The focal length of microscope group.
Optionally, each focal length and refractive index of first lens to the 9th lens meet the following conditions:
Wherein, f1~f9 respectively indicates the focal length of first lens to the 9th lens, unit mm, n1~n9 point The refractive index of first lens to the 9th lens is not indicated.
Optionally, first lens are one of meniscus, plano-concave lens or biconcave lens;Second lens For biconcave lens;The third lens are one of meniscus, convex plano lens or biconvex lens.
Optionally, first lens and second lens are directly born against by rims of the lens, second lens and The third lens are directly born against by rims of the lens.
Optionally, the 4th lens are one of convex plano lens, biconvex lens or meniscus;5th lens For one of convex plano lens, biconvex lens or meniscus;6th lens are that biconcave lens, meniscus, plano-concave are saturating One of mirror;7th lens are biconvex lens;8th lens are in biconcave lens, concave-convex lens or recessed plano lens One kind;9th lens are one of biconvex lens, meniscus or convex plano lens.
Optionally, it is born against between the 4th lens and the 5th lens using space collar, the 6th lens and institute It states and is born against between the 7th lens using space collar, the 7th lens and the 8th lens forming cemented doublet, the described 8th thoroughly It is born against between mirror and the 9th lens using space collar.
Optionally, further include diaphragm, be set between the third lens and the 4th lens.
Optionally, first lens, the 4th lens, the 7th lens and the 8th lens are that spherical surface is saturating Mirror, second lens, the third lens, the 5th lens, the 6th lens and the 9th lens are aspheric Face lens.
Optionally, the first lens, the 4th lens, the 7th lens and the 8th lens are that glass spherical surface is saturating Mirror, second lens, the third lens, the 5th lens and the 6th lens are plastic aspheric lens.
Optionally, the 9th lens are glass aspheric lenses or plastic aspheric lens.
Zoom lens provided in an embodiment of the present invention, including the compensation of the negative power arranged from the object side to the image side along optical axis The Zoom lens group of lens group and positive light coke, compensation lens group and Zoom lens group are moved back and forth along optical axis when zooming;It mends Repaying lens group includes the first lens of the negative power being arranged successively from the object side to the image side, the second lens of negative power and just The third lens of focal power;Zoom lens group includes the 4th lens, the positive light for the positive light coke being arranged successively from the object side to the image side 5th lens of focal power, the 6th lens of negative power, the 7th lens of positive light coke, the 8th lens of negative power and just 9th lens of focal power;Changed between two microscope groups by compensation lens group and Zoom lens group along optical axis reciprocating movement Zoom is realized at interval, and focal length zoom ratio is greater than 4;The collocation between structure and material by rationally designing each lens, so that Camera lens can be in the environment of -40 DEG C~80 DEG C using coke is not run, and field angle variation range is wide, and field angle variation range is 32 ° Below to 145 ° or more, it also can achieve visible light and infrared light be confocal and imaging definition, resolution ratio are in 4K or more, it is maximum Aperture reaches F1.3, guarantees that camera lens is high performance while reducing cost of manufacture, has vast market prospect.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of zoom lens wide-angle side provided in an embodiment of the present invention;
Fig. 2 is a kind of structural schematic diagram of zoom lens telescope end provided in an embodiment of the present invention;
Fig. 3 is the modulation transfer function curve signal of zoom lens wide-angle side visible light provided in an embodiment of the present invention Figure;
Fig. 4 is the MTF curve schematic diagram of zoom lens wide-angle side infrared light provided in an embodiment of the present invention;
Fig. 5 is the MTF curve schematic diagram of zoom lens telescope end visible light provided in an embodiment of the present invention;
Fig. 6 is the MTF curve schematic diagram of zoom lens telescope end infrared light provided in an embodiment of the present invention.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
The term used in embodiments of the present invention is only to be not intended to be limiting merely for for the purpose of describing particular embodiments The present invention.It should be noted that the nouns of locality such as "upper", "lower" described in the embodiment of the present invention, "left", "right" are with attached drawing institute The angle shown should not be construed as the restriction to the embodiment of the present invention come what is be described.Furthermore within a context, it is also necessary to understand , when mentioning an element and being formed on "above" or "below" another element, another can not only be formed directly into Perhaps "lower" can also be indirectly formed by intermediary element in another element "upper" or "lower" for element "upper".Term " first ", " second " etc. is used for description purposes only, and is not offered as any sequence, quantity or importance, and is used only to distinguish different groups At part.For the ordinary skill in the art, above-mentioned term in the present invention specific can be understood with concrete condition Meaning.
Fig. 1 show a kind of structural schematic diagram of zoom lens wide-angle side provided in an embodiment of the present invention, and Fig. 2 show this A kind of structural schematic diagram for zoom lens telescope end that inventive embodiments provide.With reference to Fig. 1 and Fig. 2, the embodiment of the present invention is provided Zoom lens include the compensation lens group 10 of the negative power arranged from the object side to the image side along optical axis and the zoom of positive light coke Lens group 20, compensation lens group 10 and Zoom lens group 20 are moved back and forth along optical axis when zooming;Compensation lens group 10 include from First lens 101 of the negative power that object space is arranged successively to image space, the second lens 102 of negative power and positive light coke The third lens 103;Zoom lens group 20 includes the 4th lens 201, the positive light for the positive light coke being arranged successively from the object side to the image side 5th lens 202 of focal power, the 6th lens 203 of negative power, the 7th lens 204 of positive light coke, negative power the 8th 9th lens 206 of lens 205 and positive light coke;
The focal length of the focal length and Zoom lens group 20 that compensate lens group 10 meets following relational expression:
0.7<∣Ff'/Bf'∣<1.1;
Second lens 102, the third lens 103, the 5th lens 202, the 6th lens 203 and the 9th lens 206 focal length with The focal length of the focal length and Zoom lens group 20 that compensate lens group 10 meets following relational expression:
1<∣f2/Ff'∣<4;
1.2<∣f3/Ff'∣<6.1;
1.2<∣f5/Bf'∣<3.8;
0.9<∣f6/Bf'∣<2.5;
4<∣f9/Bf'∣<35;
0.7<∣f5/f6∣<1.8;
Wherein, f2, f3, f5, f6 and f9 respectively indicate the second lens 102, the third lens 103, the 5th lens the 202, the 6th The focal length of lens 203 and the 9th lens 206, Ff' indicate that the focal length of compensation lens group, Bf' indicate the focal length of Zoom lens group.
It is understood that focal power is equal to the difference of image space light beam convergence degree and object space light beam convergence degree, it characterizes optics The ability of system deviation light.The absolute value of focal power is bigger, stronger to the bending ability of light, and the absolute value of focal power is got over It is small, it is weaker to the bending ability of light.When focal power is positive number, the flexion of light is convergence property;When focal power is negative, light The flexion of line is diversity.Focal power can be adapted for some plane of refraction (the i.e. table for lens for characterizing a lens Face), it can be adapted for characterizing some lens, be readily applicable to characterize system (the i.e. lens that multiple lens are collectively formed Group).In the present embodiment, compensation lens group 10 and Zoom lens group 20 can be set to a lens barrel (not shown in figure 1) Interior, Zoom lens group 20 is drawn when compensation lens group 10 is for compensating the movement of Zoom lens group 20 for realizing lens focus variation The aberration risen realizes clearly zoom function by compensation lens group 10 and the combination movement of Zoom lens group 20.It is mended by setting The focal length of the focal length and Zoom lens group 20 of repaying lens group 10 meets ∣ < 1.1 0.7 < ∣ Ff'/Bf', and focal length zoom ratio may be implemented Greater than 4;By adjusting the second lens 102, the third lens 103, the 5th lens 202, the 6th lens 203 and the 9th lens 206 The focal length relationship of the focal length and Zoom lens group 20 of focal length and compensation lens group 10, can achieve miniaturization, high performance wants It asks.
The technical solution of the present embodiment changes two along optical axis reciprocating movement by compensation lens group and Zoom lens group Zoom is realized at interval between microscope group, and focal length zoom ratio is greater than 4;Between structure and material by rationally designing each lens Collocation allows camera lens in the environment of -40 DEG C~80 DEG C using coke is not run, and field angle variation range is wide, field angle variation Range is 32 ° or less to 145 ° or more, also can achieve visible light and infrared light is confocal and imaging definition, resolution ratio are in 4K More than, maximum ring reaches F1.3, guarantees that camera lens is high performance while reducing cost of manufacture, has vast market prospect.
Based on the above technical solution, optionally, each focal length and folding of 101 to the 9th lens 206 of the first lens The rate of penetrating meets the following conditions:
1 focal length of lens of table and refractive index
Wherein, f1~f9 respectively indicates the focal length of 101 to the 9th lens 206 of the first lens, unit mm, n1~n9 difference Indicate the refractive index of 101 to the 9th lens 206 of the first lens.
It should be noted that f9=- ∞~+∞ indicates that the 9th lens 206 are the lens for being similar to no focal power, focal length Range is determined according to after the focus design of the first eight lens, guarantees the zoom ratio of zoom lens for designing focal power according to demand With image quality.
Optionally, the first lens 101 can be one of meniscus, plano-concave lens or biconcave lens;Second lens 102 can be biconcave lens;The third lens 103 can be one of meniscus, convex plano lens or biconvex lens.
Optionally, the first lens 101 and the second lens 102 are directly born against by rims of the lens, the second lens 102 and third Lens 103 are directly born against by rims of the lens.
It in the specific implementation, can be according to the shape of physical condition and each lens of Demand Design, in the present embodiment, first Lens 101, the second lens 102 and the third lens 103 are closer, and can directly be born against by rims of the lens, so that fixed mend The relative position for repaying each lens in lens group 10 avoids two lens light effective diameter regions from colliding.
Optionally, the 4th lens 201 can be one of convex plano lens, biconvex lens or meniscus;5th lens 202 can be one of convex plano lens, biconvex lens or meniscus;6th lens 203 can be saturating for biconcave lens, convex-concave One of mirror, plano-concave lens;7th lens 204 can be biconvex lens;8th lens 205 can be biconcave lens, bumps One of lens or recessed plano lens;9th lens 206 can be one of biconvex lens, meniscus or convex plano lens.
Optionally, it is born against between the 4th lens 201 and the 5th lens 202 using space collar, the 6th lens 203 and the 7th are saturating Born against between mirror 204 using space collar, the 7th lens 204 and the 8th lens 205 form cemented doublet, the 8th lens 205 with It is born against between 9th lens 206 using space collar.
In the present embodiment, the 4th lens 201 and the 5th lens 202, the 6th lens 203 and the 7th lens 204, the 8th lens 206 and the 9th lens 206 edge between distance relatively far away from, therefore born against by space collar, thus fixed Zoom lens group The relative position of each lens in 20.By making the 7th lens 204 and the 8th lens 205 form cemented doublet, can effectively disappear Except color difference, the infrared confocal effect of camera lens is improved.
Optionally, it continues to refer to figure 1 and Fig. 2, zoom lens provided in this embodiment further includes diaphragm 30, be set to third Between lens 103 and the 4th lens 201.When zoom lens zoom, 30 position of diaphragm is fixed, and compensate lens group 10 with Zoom lens group 20 is alternative mobile.
Optionally, the first lens 101, the 4th lens 201, the 7th lens 204 and the 8th lens 205 are spherical lens, Second lens 102, the third lens 103, the 5th lens 202, the 6th lens 203 and the 9th lens 206 are non-spherical lens.
Optionally, the first lens 101, the 4th lens 201, the 7th lens 204 and the 8th lens 205 are that glass spherical surface is saturating Mirror, the second lens 102, the third lens 103, the 5th lens 202 and the 6th lens 203 are plastic aspheric lens.
The embodiment of the present invention moulds mixed optical texture using glass, and glass lens is easy to process, and plastic aspheric lens can Preferably to correct aberration, so that the resolution of camera lens improves, reach 4K resolution ratio, aperture increases, and maximum supports that F1.3's is big Aperture.
Optionally, the 9th lens 206 are glass aspheric lenses or plastic aspheric lens.In high/low temperature balanced design When, when other eight lens strengths are more inadequate than the degree of balance, using glass aspheric lenses, when other eight lens strengths When than balance, using plastic aspheric lens, cost can be effectively reduced.
Illustratively, table 2 show a kind of each structural parameters of the compound lens value of zoom lens provided in an embodiment of the present invention:
A kind of design value of each lens of 2 zoom lens of table
Face serial number Face type R(mm) D(mm) nd k
1 Spherical surface 151.21 0.60 1.72
2 Spherical surface 6.94 5.04
3 It is aspherical -16.07 1.25 1.54 -23.10
4 It is aspherical 22.78 0.30 4.10
5 It is aspherical 14.81 1.95 1.66 -19.10
6 It is aspherical 285.20 Airspace is variable -145.60
Diaphragm Plane PL Airspace is variable
7 Spherical surface 8.37 2.20 1.59
8 Spherical surface 143.82 0.10
9 It is aspherical 14.11 1.62 1.53 -8.82
10 It is aspherical -80.01 0.05 -91.63
11 It is aspherical -73.30 0.80 1.63 -89.42
12 It is aspherical 15.35 0.37 -0.53
13 Spherical surface 11.01 3.50 1.43
14 Spherical surface -5.30 0
15 Spherical surface -5.30 3.25 1.61
16 Spherical surface -25.51 0.40
17 It is aspherical 11.59 1.30 1.53 -15.52
18 It is aspherical 14.81 Airspace is variable -10.42
19 Image planes Plane
Wherein, face serial number 1 indicate the first lens 101 close to object space front surface, and so on, PL indicates that the surface is flat Face;R indicates spherical radius, and positive to indicate sphere centre close to image planes side, bearing indicates sphere centre close to object plane side;D is indicated On optical axis distance of the Current surface to next surface;The refractive index of nd expression lens;K indicates aspherical circular cone coefficient.
Wherein, the face type of each non-spherical lens is by formula:
It determines, wherein z is rise, and c is the curvature of curved surface apex, and r is surface points coordinate perpendicular to optical axial plane At a distance from optical axis, k is circular cone coefficient, a for projection1、a2、a3、a4、a5、a6、a7And a8Indicate the corresponding coefficient of even order terms.
Table 3 indicates each aspherical even term coefficient in above-described embodiment:
Each aspherical parameter of table 3
Face serial number a1 a2 a3 a4 a5 a6 a7 a8
3 0 -1.251807E-4 -1.231690E-4 2.336421E-5 -3.128164E-6 -6.110247E-8 0 0
4 0 -1.381426E-3 -2.583452E-4 6.991472E-5 -7.554671E-6 1.317432E-7 0 0
5 0 1.684651E-3 -7.614720E-4 1.253214E-4 -1.664723E-5 1.297412E-7 0 0
6 0 8.921745E-3 -1.487014E-3 1.331472E-4 8.213241E-6 -1.837121E-6 0 0
9 0 1.881256E-4 -6.118213E-4 2.184151E-5 1.214281E-5 -1.262101E-6 0 0
10 0 1.614752E-3 -6.940023E-4 2.527101E-5 1.727322E-6 -1.531025E-8 0 0
11 0 -8.024715E-4 -1.910123E-5 -1.516123E-6 5.216241E-8 1.017632E-9 0 0
12 0 7.223765E-5 8.821565E-6 -1.216523E-6 8.719271E-9 9.615672E-10 0 0
17 0 -8.064115E-4 -1.091805E-4 2.721501E-6 -3.521903E-7 2.881506E-8 0 0
18 0 -5.421705E-4 -1.361901E-4 6.621504E-6 -4.811501E-7 3.281463E-8 0 0
Wherein, face serial number 3,5,9,11,17 respectively corresponds the second lens 102, the third lens 103, the 5th lens 202, Close to the front surface of object plane, face serial number 4,6,10,12,18 respectively corresponds the second lens for six lens 203 and the 9th lens 206 102, the third lens 103, the 5th lens 202, the 6th lens 203 and the 9th lens 206 close to image planes rear surface ,- 1.251807E-4 indicating -1.251807 × 10-4
Fig. 3 show the modulation transfer function curve of zoom lens wide-angle side visible light provided in an embodiment of the present invention Schematic diagram, Fig. 4 show the MTF curve schematic diagram of zoom lens wide-angle side infrared light provided in an embodiment of the present invention, shown in Fig. 5 For the MTF curve schematic diagram of zoom lens telescope end visible light provided in an embodiment of the present invention, Fig. 6 show the embodiment of the present invention The MTF curve schematic diagram of the zoom lens telescope end infrared light of offer.Zoom lens provided in this embodiment, using glass spherical surface The optical texture that lens are mixed with plastic aspheric lens significantly reduces the cost of camera lens, and glass lens is easy to process, modeling Material non-spherical lens can preferably correct aberration, and camera lens has a higher imaging performance, and camera lens has total focal power and is The compensation lens group that positive Zoom lens group and total focal power are negative, by changing Zoom lens group and compensating the interval of lens group The function of zoom may be implemented, focal length zoom ratio is greater than 4, by the material of reasonably combined plastic aspherical element eyeglass, so that camera lens Can be in the environment of -40 DEG C~80 DEG C using coke is not run, field angle variation range is wide, and field angle variation range is 32 ° or less To 145 ° or more, it also can achieve visible light and infrared light be confocal and imaging definition, resolution ratio are in the effect of 4K or more.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation, It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.

Claims (10)

1. a kind of zoom lens, which is characterized in that including the compensation lens of the negative power arranged from the object side to the image side along optical axis The Zoom lens group of group and positive light coke, the compensation lens group are reciprocal along the optical axis when zooming with the Zoom lens group It is mobile;
It is described compensation lens group include the first lens of the negative power being arranged successively from the object side to the image side, negative power second The third lens of lens and positive light coke;
The Zoom lens group include the 4th lens of the positive light coke being arranged successively from the object side to the image side, positive light coke the 5th Lens, the 6th lens of negative power, the 7th lens of positive light coke, the 8th lens of negative power and positive light coke Nine lens;
The focal length of the compensation lens group and the focal length of the Zoom lens group meet following relational expression:
0.7<∣Ff'/Bf'∣<1.1;
Second lens, the third lens, the 5th lens, the 6th lens and the 9th lens focal length with The focal length of the compensation lens group and the focal length of the Zoom lens group meet following relational expression:
1<∣f2/Ff'∣<4;
1.2<∣f3/Ff'∣<6.1;
1.2<∣f5/Bf'∣<3.8;
0.9<∣f6/Bf'∣<2.5;
4<∣f9/Bf'∣<35;
0.7<∣f5/f6∣<1.8;
Wherein, f2, f3, f5, f6 and f9 respectively indicate second lens, the third lens, the 5th lens, described The focal length of six lens and the 9th lens, Ff' indicate that the focal length of the compensation lens group, Bf' indicate the Zoom lens group Focal length.
2. zoom lens according to claim 1, which is characterized in that each coke of first lens to the 9th lens Away from and refractive index meet the following conditions:
F1=-20~-6 N1=1.5~2.05 F2=-35~-8.8 N2=1.43~1.75 F3=10~50 N3=1.5~2.05 F4=7~30 N4=1.43~1.75 F5=10~50 N5=1.4~1.65 F6=-40~-9.5 N6=1.5~1.85 F7=4.1~16.8 N7=1.4~1.7 F8=-21~-5.5 N8=1.45~1.85 F9=- ∞~+∞ N9=1.4~1.85
Wherein, f1~f9 respectively indicates the focal length of first lens to the 9th lens, and unit mm, n1~n9 distinguish table Show the refractive index of first lens to the 9th lens.
3. zoom lens according to claim 1, which is characterized in that first lens are meniscus, plano-concave lens Or one of biconcave lens;Second lens are biconcave lens;The third lens are meniscus, convex plano lens or double One of convex lens.
4. zoom lens according to claim 3, which is characterized in that first lens and second lens pass through thoroughly Mirror edge is directly born against, and second lens and the third lens are directly born against by rims of the lens.
5. zoom lens according to claim 1, which is characterized in that the 4th lens are convex plano lens, biconvex lens Or one of meniscus;5th lens are one of convex plano lens, biconvex lens or meniscus;Described 6th Lens are one of biconcave lens, meniscus, plano-concave lens;7th lens are biconvex lens;8th lens For one of biconcave lens, concave-convex lens or recessed plano lens;9th lens are that biconvex lens, meniscus or convex flat are saturating One of mirror.
6. zoom lens according to claim 5, which is characterized in that make between the 4th lens and the 5th lens It is born against with space collar, is born against between the 6th lens and the 7th lens using space collar, the 7th lens and the 8th Lens forming cemented doublet is born against between the 8th lens and the 9th lens using space collar.
7. zoom lens according to claim 1, which is characterized in that further include diaphragm, be set to the third lens with Between 4th lens.
8. zoom lens according to claim 1, which is characterized in that first lens, the 4th lens, described Seven lens and the 8th lens are spherical lens, second lens, the third lens, the 5th lens, described 6th lens and the 9th lens are non-spherical lens.
9. zoom lens according to claim 8, which is characterized in that the first lens, the 4th lens, the described 7th are thoroughly Mirror and the 8th lens are glass spherical lens, second lens, the third lens, the 5th lens and described 6th lens are plastic aspheric lens.
10. zoom lens according to claim 8, which is characterized in that the 9th lens be glass aspheric lenses or Plastic aspheric lens.
CN201910570171.0A 2019-06-27 2019-06-27 A kind of zoom lens Pending CN110174755A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110568600A (en) * 2019-08-28 2019-12-13 深圳市灿锐科技有限公司 Variable-working-distance variable-magnification telecentric lens and use method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110568600A (en) * 2019-08-28 2019-12-13 深圳市灿锐科技有限公司 Variable-working-distance variable-magnification telecentric lens and use method thereof

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