CN110579867B - Zoom security lens - Google Patents

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CN110579867B
CN110579867B CN201810578431.4A CN201810578431A CN110579867B CN 110579867 B CN110579867 B CN 110579867B CN 201810578431 A CN201810578431 A CN 201810578431A CN 110579867 B CN110579867 B CN 110579867B
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lens
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CN110579867A (en
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廖一州
葛航笠
盛亚茗
尚洁阳
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Jiaxing Zhongrun Optical Technology Co Ltd
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Jiaxing Zhongrun Optical Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
    • G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
    • G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
    • G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
    • G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+

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Abstract

A zoom security lens sequentially comprises from an object plane side to an image plane side: the zoom lens comprises a first fixed lens group with positive focal power, a zoom lens group with negative focal power, a diaphragm, a second fixed lens group with positive focal power, a focusing lens group with positive focal power and an imaging surface, wherein: the zoom lens group moves from the object side to the image plane side along the optical axis, and meanwhile, the focusing lens group performs nonlinear movement corresponding to the zoom lens group along the optical axis to be used as compensation, so that the stability of the system image plane in the focal length change process is ensured; the lens has the advantages that the 4K resolution, the large aperture and the infrared confocal are realized, meanwhile, the distortion of an optical system is obviously reduced, the brightness ratio is improved, the stray light is eliminated, and the popularization of the zooming face recognition camera is facilitated.

Description

Zoom security lens
Technical Field
The invention relates to a technology in the field of optical devices, in particular to a zoom security lens for face recognition.
Background
Most of the existing lenses for face recognition are fixed-focus lenses, only have fixed field angles, have low imaging quality and small aperture when recognizing a remote face, and influence the accuracy of face recognition when light is dark; the brightness distribution of the picture is not uniform enough, the center is bright, the periphery is dark, and the recognition of the face with the edge view field is not facilitated; the ghost and stray light of the system are serious, and the picture quality is rapidly reduced under strong light, so that the face cannot be accurately identified.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the invention provides the zoom security lens, which can obviously reduce the distortion of an optical system, improve the light ratio and eliminate stray light while realizing the 4K resolution, large aperture and infrared confocal, and is beneficial to the popularization of the zoom face recognition camera.
The invention is realized by the following technical scheme:
the invention comprises the following components in sequence from the object plane side to the image plane side: the zoom lens comprises a first fixed lens group with positive focal power, a zoom lens group with negative focal power, a diaphragm, a second fixed lens group with positive focal power, a focusing lens group with positive focal power and an imaging surface, wherein: the zoom lens group moves from the object side to the image plane side along the optical axis, and meanwhile the focusing lens group does nonlinear movement corresponding to the zoom lens group along the optical axis to be used as compensation, so that the stability of the system image plane in the focal length change process is ensured.
The ratio f of the focal length of the first fixed lens group, the variable power lens group, the second fixed lens group and the focusing lens group to the focal length of the wide-angle end of the whole optical systemA/fW、fB/fW、fC/fW、fD/fWSatisfy in proper order: (4.2,5.6), (-1.7, -0.95), (1.5,2.3), (2.3, 3.4).
The first fixed lens group includes: at least three lenses or mirrors with positive optical power, any of which may be replaced by two or more lenses of the same type.
The first fixed lens group specifically includes, in order from the object plane side to the image plane side: a cemented lens with positive focal power and two spherical lenses with positive focal power.
The positive focal power cemented lens is formed by cementing a negative focal power spherical lens and a positive focal power spherical lens, and the ratio of the focal lengths of the four spherical lenses to the focal length of the whole first fixed lens group preferably satisfies the following conditions in sequence: (-3.95, -2.0), (1.8,2.5), the ratio of the combined focal length of the cemented lens to the focal length of the entire first fixed lens group a satisfies: (13.75,9.6).
The moving amount of the zoom lens group satisfies Δ BW→TTTL ∈ (0.19,0.27), where: delta BW→TTTL is the total length of the optical system, and is the relative displacement of the first lens front vertex in the variable power lens group between the wide-angle end position and the telephoto end position.
The variable power lens group comprises: at least two lenses with negative focal power and one lens with positive focal power.
The variable power lens group specifically comprises the following components in sequence from the object plane side to the image plane side: the ratio of the focal length of the three spherical lenses to the focal length of the whole zoom lens group preferably satisfies the following conditions in sequence: (1.5,2.0), (1.5,2.2), (-4.5, -3.25).
The diaphragm is an iris diaphragm, namely, the diaphragm is correspondingly narrowed along with the increase of the ambient light intensity, and the position of the diaphragm meets LS-L1a/TTL ∈ (0.49,0.57), wherein: l isS-L1The distance from the diaphragm to the front surface of the first lens in the first fixed lens group, and the TTL is the total optical length of the zoom security lens, that is, the distance from the center vertex of the front surface of the first lens in the first fixed lens group to the image plane。
The second fixed lens group includes: at least two lenses with positive focal power and two lenses or lenses with negative focal power.
The second fixed lens group specifically includes in order from the object plane side to the image plane side: the optical lens comprises a spherical lens with positive focal power, a first cemented doublet with negative focal power, an aspheric lens with positive focal power and a second cemented doublet with negative focal power.
The first double cemented lens is formed by cementing a spherical lens with negative focal power and a spherical lens with positive focal power; the second double cemented lens is formed by cementing a spherical lens with positive focal power and a spherical lens with negative focal power, and the ratio of the focal lengths of the six lenses to the focal length of the whole second fixed lens group preferably satisfies the following requirements in sequence: (1.2,2.4), (-1.4, -0.75), (0.9,1.6), (0.6,1.1), (0.75,1.7), (-0.8, -0.4), the ratio of the combined focal length of the first and second cemented doublet to the focal length of the entire second fixed lens group C preferably satisfies in sequence: (-7.4, -4.5), (-1.9, -1.0).
The focusing lens group comprises: at least one lens or lens with positive focal power.
The focusing lens group is a positive focal power double cemented lens formed by a negative focal power spherical lens and a positive focal power spherical lens in a cemented mode.
And a filter lens for filtering out light rays of unnecessary wave bands and stray light is arranged in front of the imaging surface.
The imaging surface is provided with a semiconductor photosensitive element.
Further, the zoom security lens meets the following conditions.
The refractive indexes of the third lens and the fourth lens in the first fixed lens group sequentially satisfy that: (1.3,1.65), Abbe number satisfies in order: (60,100), (60, 100).
The refractive index of the third lens in the variable power lens group satisfies the following conditions: (1.8,2.0), the abbe number satisfies: (15,40).
The refractive indexes of the first lens, the third lens and the fifth lens in the second fixed lens group sequentially satisfy that: (1.3,1.65), the abbe number satisfies in order: (60,100), (60, 100).
The aspherical formulae of all aspherical lenses of the present invention are expressed as follows:
Figure BDA0001687785980000021
wherein: z is the rise sag of the distance from the aspheric surface to the vertex when the height of the aspheric surface along the optical axis direction is h; r represents the radius of curvature of the mirror surface, K is the conic coefficient conc, A, B, C, D, E, F is the higher order aspheric coefficient, and e in the coefficients represents the scientific count number, as shown by example e-005.
Technical effects
Compared with the prior art, the invention adopts a four-group two-group linkage zooming structure, realizes 4K high-definition imaging at all multiplying powers, realizes face monitoring at different field angles, can change the focal length when scanning a remote face at a large field angle, and ensures imaging quality to identify the face at a small field angle; the structure that the aperture of the front lens is large and the aperture of the rear lens is small is adopted in the zoom group, so that imaging under all multiplying powers is free of distortion, and the identification speed and accuracy are remarkably improved; the aperture of the lens is firstly reduced, then increased and then reduced, so that the aperture of the system is increased, the light incoming quantity of the system is higher than that of a common security lens by more than 40%, and the imaging quality at night is ensured; ghost images and veiling glare of the system are significantly reduced by the focal length setting.
Drawings
FIG. 1 is a schematic structural view (intermediate magnification) of example 1;
FIG. 2 is a schematic view of the wide-angle end structure of example 1;
FIG. 3 is a schematic view of the telescopic end structure of embodiment 1;
FIG. 4 is a schematic view of the resulting spherical aberration for the structure of FIG. 1;
FIG. 5 is a schematic view of the resulting spherical aberration for the structure of FIG. 2;
FIG. 6 is a schematic view of the resulting spherical aberration for the structure of FIG. 3;
FIG. 7 is a schematic structural view of example 2;
the middle magnification, the wide-angle end and the telephoto end are sequentially arranged from top to bottom in the figure;
FIG. 8 is a schematic view of the spherical aberration obtained by the structure of example 2;
the middle magnification, the wide-angle end and the telephoto end structure are sequentially corresponding to each other from top to bottom in the drawing;
FIG. 9 is a schematic structural view of example 3;
the middle magnification, the wide-angle end and the telephoto end are sequentially arranged from top to bottom in the figure;
FIG. 10 is a schematic view of the spherical aberration obtained by the structure of example 3;
the middle magnification, the wide-angle end and the telephoto end structure are sequentially corresponding to each other from top to bottom in the drawing;
in the figure: the zoom lens comprises a first fixed lens group A, lenses A1-A4 in the first fixed lens group, a zoom lens group B, lenses B1-B4 in the zoom lens group, a diaphragm S, a second fixed lens group C, lenses C1-C4 in the second fixed lens group, a focusing lens group D, lenses D1-D4 in the focusing lens group, an image plane IMG, a filter lens IRCF, lens surfaces S1-S29, air intervals D7, D13, D24 and D27.
Detailed Description
Example 1
As shown in fig. 1, the zoom optical system of the present embodiment includes, in order from the object plane side to the image plane side: the zoom lens comprises a first fixed lens group A with positive focal power, a zoom lens group B with negative focal power, a diaphragm S, a second fixed lens group C with positive focal power and a focusing lens group D with positive focal power, wherein: the first fixed lens group A and the second fixed lens group C are always in a fixed state, the zoom lens group B moves from the object side to the image plane side along the optical axis to be used as a zoom group, the field angle of a lens is zoomed from the wide-angle end to the telephoto end, meanwhile, the focusing lens group D performs nonlinear movement which has a specific function relation with the position, the imaging wavelength, the temperature and the imaging object distance of the zoom lens group B along the optical axis to be used as a focusing group, the image plane fluctuation caused by zooming is corrected and focused, and the stability of the system image plane in the process of focal length change is ensured.
The specific settings of the zoom optical system in the present embodiment are as follows:
wide angle end focal length fW＝9mm，Focal length f of telescope T50 mm; wide angle end f number FNOW1.30, f-number FNO of telescopeT1.50; wide-angle end half field angle omegaW25.0 °, half field angle ω of the telescopic endT5.0 °; the total optical length (i.e., the distance from the center vertex of the front surface of the first lens to the image plane) TTL of the optical system is 85 mm.
Figure BDA0001687785980000041
Figure BDA0001687785980000051
Wherein D7, D13, D24 and D27 sequentially represent the distance from the surface of s7 to the surface of s8, the distance from the surface of s13 to the diaphragm s, the distance from the surface of s24 to the surface of s25 and the distance from the surface of s27 to the surface of s 28.
The corresponding conic coefficients (K) and aspherical coefficients (A, B, C, D, E) of the aspherical lens applied in the present embodiment are as follows:
Figure BDA0001687785980000052
the wide-angle end, intermediate magnification position, and telephoto end magnification variation data of this embodiment are as follows:
wide angle end Intermediate magnification position Telescope end
D7 0.90 14.70 20.55
D13 20.25 6.45 0.60
D24 5.32 3.25 7.00
D27 6.43 8.50 4.75
In this embodiment, the ratio f of the focal length of the first fixed lens group a, the variable power lens group B, the second fixed lens group C, and the focusing lens group D to the focal length at the wide-angle end of the entire optical systemA/fW、fB/fW、fC/fW、fD/fWSequentially comprises the following steps: 4.75, -1.23, 1.95, 3.02.
In this embodiment, the ratio f of the focal lengths of the a1, a2, A3 and a4 lenses in the first fixed lens group a to the focal length of the entire first fixed lens group aA1/fA、fA2/fA、fA3/fA、fA4/fASequentially comprises the following steps: the ratio f of the combined focal length of the cemented lens formed by the 3.91, 2.07, 2.19 and 2.08, A1 lens and the A2 lens through the cementing to the focal length of the whole first fixed lens group AA1A2/fAComprises the following steps: 11.24.
variations in the present embodimentThe ratio f of the focal lengths of the B1 lens, the B2 lens and the B3 lens in the zoom lens group B to the focal length of the whole zoom lens group BB1/fB、fB2/fB、fB3/fBSequentially comprises the following steps: 1.65, 1.74, -3.70.
The position of the diaphragm S in this embodiment is: l isS-L10.54, wherein: l isS-L1TTL is the total optical length of the optical system (i.e., the distance from the center vertex of the front surface of the first lens to the image plane).
In the present embodiment, the ratio f of the focal lengths of the C1 lens, the C2 lens, the C3 lens, the C4 lens, the C5 lens and the C6 lens in the second fixed lens group C to the focal length of the entire second fixed lens group CC1/fC、fC2/fC、fC3/fC、fC4/fC、fC5/fC、fC6/fCSequentially comprises the following steps: the ratio f of the combined focal length of the double cemented lens formed by the lens C2, the lens C3 and the lens C5 and the lens C6 through the cementing of the lens C7, the lens C97, the lens C27, the lens C01, the lens C12, the lens C56 and the lens C3 to the focal length of the whole second fixed lens group CC2C3/fC、fC5C6/fCSequentially comprises the following steps: -5.45, -1.31.
Refractive index Nd of A3 and a4 lenses in the first fixed lens group a in this embodimentA3、NdA4Sequentially comprises the following steps: 1.49700, 1.49700, A3 and A4 Abbe numbers Vd of lensesA3、VdA4Sequentially comprises the following steps: 81.61, 81.61.
Refractive index Nd of B3 lens in variable power lens group B in this embodimentB3Comprises the following steps: 1.945945 Abbe number Vd of B3 lensB3Comprises the following steps: 17.98.
refractive index Nd of C1, C3 and C5 lenses in the second fixed lens group C in the embodimentC1、NdC3、NdC5Comprises the following steps: 1.49700, 1.618000, 1.618000, C1, C3 and C5 Abbe number Vd of lensC1、VdC3、VdC5Comprises the following steps: 81.61, 63.40, 63.40.
The variable power lens group B in the present embodiment has a movement amount and light from a position at the wide-angle end of the optical system to a position at the telephoto end of the optical systemRatio of total optical length of optical system Delta BW→Tthe/TTL is: 0.23, wherein: delta BW→TTTL is the total optical length of the optical system (i.e., the distance from the center vertex of the front surface of the first lens to the image plane), which is the relative displacement of the front vertex of the B1 lens in the variable power lens group B between the wide-angle end position and the telephoto end position.
Example 2
As shown in fig. 2, the zoom optical system of the present embodiment has the following specific settings compared to embodiment 1:
wide angle end focal length fW6.5mm, telescope focal length fT35 mm; wide angle end f number FNOW1.30, f-number FNO of telescopeT1.50; wide-angle end half field angle omegaW28.0 °, half field angle ω of the telescopic endT5.8 °; the total optical length (i.e., the distance from the center vertex of the front surface of the first lens to the image plane) TTL of the optical system is 60 mm.
Figure BDA0001687785980000061
Figure BDA0001687785980000071
The corresponding conic coefficients (K) and aspherical coefficients (A, B, C, D, E) of the aspherical lens applied in the present embodiment are as follows:
Figure BDA0001687785980000072
the wide-angle end, intermediate magnification position, and telephoto end magnification variation data of this embodiment are as follows:
Figure BDA0001687785980000073
Figure BDA0001687785980000081
in this embodiment, the ratio f of the focal length of the first fixed lens group a, the variable power lens group B, the second fixed lens group C, and the focusing lens group D to the focal length at the wide-angle end of the entire optical systemA/fW、fB/fW、fC/fW、fD/fWSequentially comprises the following steps: 5.33, -1.35, 1.66, 2.56.
In this embodiment, the ratio f of the focal lengths of the a1, a2, A3 and a4 lenses in the first fixed lens group a to the focal length of the entire first fixed lens group aA1/fA、fA2/fA、fA3/fA、fA4/fASequentially comprises the following steps: the ratio f of the combined focal length of the cemented lens formed by the 2.91, 2.44, 2.41, 2.33, A1 lens and the A2 lens through the cementing to the focal length of the whole first fixed lens group AA1A2/fAComprises the following steps: 10.18.
in the present embodiment, the ratio f of the focal lengths of the B1 lens, the B2 lens and the B3 lens in the variable power lens group B to the focal length of the entire variable power lens group BB1/fB、fB2/fB、fB3/fBSequentially comprises the following steps: 1.91, 1.94, -4.16.
The position of the diaphragm S in this embodiment is: l isS-L10.55, wherein: l isS-L1TTL is the total optical length of the optical system (i.e., the distance from the center vertex of the front surface of the first lens to the image plane).
In the present embodiment, the ratio f of the focal lengths of the C1 lens, the C2 lens, the C3 lens, the C4 lens, the C5 lens and the C6 lens in the second fixed lens group C to the focal length of the entire second fixed lens group CC1/fC、fC2/fC、fC3/fC、fC4/fC、fC5/fC、fC6/fCSequentially comprises the following steps: the ratio f of the combined focal length of the double cemented lens formed by the lens C2, the lens C3 and the lens C5 and the lens C6 through the cementing to the focal length of the whole second fixed lens group C is 1.98, -1.12, 1.02, 0.98, 1.54, -0.71C2C3/fC、fC5C6/fCSequentially comprises the following steps: -6.98, -1.81.
Refractive index Nd of A3 and a4 lenses in the first fixed lens group a in this embodimentA3、NdA4Sequentially comprises the following steps: 1.61800, 1.49700, A3 and A4 Abbe numbers Vd of lensesA3、VdA4Sequentially comprises the following steps: 63.40, 81.61.
Refractive index Nd of B3 lens in variable power lens group B in this embodimentB3Comprises the following steps: abbe number Vd of 1.922860, B3 lensB3Comprises the following steps: 20.88.
refractive index Nd of C1, C3 and C5 lenses in the second fixed lens group C in the embodimentC1、NdC3、NdC5Comprises the following steps: 1.593490, 1.593490, 1.618000, C1, C3 and C5 Abbe number Vd of lensC1、VdC3、VdC5Comprises the following steps: 67.00, 63.40.
In this embodiment, the ratio Δ B of the amount of movement of the variable power lens group B from the wide-angle end position to the telephoto end position of the optical system to the total optical length of the optical system is set to the valueW→Tthe/TTL is: 0.25, wherein: delta BW→TTTL is the total optical length of the optical system (i.e., the distance from the center vertex of the front surface of the first lens to the image plane), which is the relative displacement of the front vertex of the B1 lens in the variable power lens group B between the wide-angle end position and the telephoto end position.
Example 3
As shown in fig. 3, the zoom optical system of the present embodiment is shown. Compared with embodiment 1, the C1 lens and the C2 lens in this embodiment continuously use two positive power lenses to achieve the effect originally achieved by using only C1 one positive lens, and the combined focal length, refractive index and abbe number of the C1 and C2 lenses in this embodiment are in the same range as those of the C1 one positive lens.
The specific settings of the zoom optical system in the present embodiment are as follows:
wide angle end focal length fWFocal length f of telescope equal to 10.0mmT50.0 mm; wide angle end f number FNOW1.30, f-number FNO of telescopeT1.50; wide-angle end half field angle omegaW24.5 degrees, half field angle omega at the telescopic endT5.0 °; optical systemTTL (i.e., the distance from the center vertex of the front surface of the first lens to the image plane) is 85.0 mm.
Figure BDA0001687785980000091
Figure BDA0001687785980000101
The corresponding conic coefficients (K) and aspherical coefficients (A, B, C, D, E) of the aspherical lens applied in the present embodiment are as follows:
Figure BDA0001687785980000102
the wide-angle end, intermediate magnification position, and telephoto end magnification variation data of this embodiment are as follows:
wide angle end Intermediate magnification position Telescope end
D7 0.80 13.81 19.14
D13 19.00 5.99 0.66
D24 5.28 2.98 6.46
D27 5.91 8.21 4.73
In this embodiment, the ratio f of the focal length of the first fixed lens group a, the variable power lens group B, the second fixed lens group C, and the focusing lens group D to the focal length at the wide-angle end of the entire optical systemA/fW、fB/fW、fC/fW、fD/fWSequentially comprises the following steps: 4.99, -1.64, 2.11, 3.31.
In this embodiment, the ratio f of the focal lengths of the a1, a2, A3 and a4 lenses in the first fixed lens group a to the focal length of the entire first fixed lens group aA1/fA、fA2/fA、fA3/fA、fA4/fASequentially comprises the following steps: the ratio f of the combined focal length of the cemented lens formed by the 2.12, 1.88, 2.43 and 2.46A 1 lens and the A2 lens to the focal length of the entire first fixed lens group AA1A2/fAComprises the following steps: 9.89.
in the present embodiment, the ratio f of the focal lengths of the B1 lens, the B2 lens and the B3 lens in the variable power lens group B to the focal length of the entire variable power lens group BB1/fB、fB2/fB、fB3/fBSequentially comprises the following steps: 1.77, 1.98, -3.92.
The position of the diaphragm S in this embodiment is: l isS-L10.53, wherein: l isS-L1TTL is the total optical length of the optical system (i.e., the first order)The distance from the center vertex of the front surface of the lens to the image plane).
In this embodiment, the ratio f between the focal length of the C1 and the C2 lenses, the focal length of the C3 lenses, the C4 lenses, the C5 lenses, the C6 lenses, and the C7 lenses in the second fixed lens group C and the focal length of the entire second fixed lens group CC1/fC、fC2/fC、fC3/fC、fC4/fC、fC5/fC、fC6/fC、fC7/fCSequentially comprises the following steps: the ratio f of the combined focal length of the double cemented lens formed by the lens C3, the lens C4 and the lens C6 and the lens C7 through the cementing to the focal length of the whole second fixed lens group C is 1.97, -1.31, 1.02, 0.71, 1.29, -0.62C3C4/fC、fC6C7/fCSequentially comprises the following steps: -6.63, -1.59.
Refractive index Nd of A3 and a4 lenses in the first fixed lens group a in this embodimentA3、NdA4Sequentially comprises the following steps: 1.49700, 1.49700, A3 and A4 Abbe numbers Vd of lensesA3、VdA4Sequentially comprises the following steps: 81.61, 81.61.
Refractive index Nd of B3 lens in variable power lens group B in this embodimentB3Comprises the following steps: 2.002720 Abbe number Vd of B3 lensB3Comprises the following steps: 19.32.
the refractive index Nd of the C1, C2, C4 and C6 lenses in the second fixed lens group C in the present embodimentC1、NdC2、NdC4、NdC6Comprises the following steps: 1.592820, 1.49700, 1.618000, 1.592820, C1, C2, C4 and C6 lens abbe number VdC1、VdC2、VdC4、VdC6Comprises the following steps: 68.63, 81.61, 63.40, 68.63.
In this embodiment, the ratio Δ B of the amount of movement of the variable power lens group B from the wide-angle end position to the telephoto end position of the optical system to the total optical length of the optical system is set to the valueW→Tthe/TTL is: 0.23, wherein: delta BW→TTTL is the total optical length of the optical system (i.e., the distance from the center vertex of the front surface of the first lens to the image plane), which is the relative displacement of the front vertex of the B1 lens in the variable power lens group B between the wide-angle end position and the telephoto end position.
The foregoing embodiments may be modified in many different ways by those skilled in the art without departing from the spirit and scope of the invention, which is defined by the appended claims and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (12)

1. A zoom security lens is characterized by comprising a first fixed lens group with positive focal power, a variable power lens group with negative focal power, a diaphragm, a second fixed lens group with positive focal power, a focusing lens group with positive focal power and an imaging surface in sequence from an object surface side to an image surface side, wherein: the zoom lens group moves from the object side to the image plane side along the optical axis, and meanwhile, the focusing lens group performs nonlinear movement corresponding to the zoom lens group along the optical axis to be used as compensation, so that the stability of the system image plane in the focal length change process is ensured;
the moving amount of the zoom lens group satisfies Δ BW→TTTL ∈ (0.19,0.27), where: delta BW→TThe lens is characterized in that relative displacement of the front vertex of a first lens in a variable power lens group at the wide-angle end position and the telephoto end position is provided, and TTL is the total length of an optical system;
the first fixed lens group includes: at least three lenses or lenses having positive optical power;
the variable power lens group comprises: at least two lenses with negative focal power and one lens with positive focal power;
the focusing lens group comprises: at least one lens or lens with positive focal power;
the second fixed lens group specifically includes in order from the object plane side to the image plane side: the optical lens comprises a spherical lens with positive focal power, a first cemented doublet with negative focal power, an aspheric lens with positive focal power and a second cemented doublet with negative focal power.
2. The lens barrel as claimed in claim 1, wherein the first fixed lens group includes, in order from the object plane side to the image plane side: a cemented lens with positive focal power and two spherical lenses with positive focal power.
3. The lens barrel as claimed in claim 2, wherein the positive focal power cemented lens is composed of a negative focal power spherical lens cemented with a positive focal power spherical lens, and the ratio of the focal lengths of the four spherical lenses to the focal length of the entire first fixed lens group satisfies in sequence: (-3.95, -2.0), (1.8,2.5), the ratio of the combined focal length of the cemented lens to the focal length of the entire first fixed lens group satisfies: (13.75,9.6).
4. The lens barrel according to claim 1, wherein the variable power lens group includes, in order from an object plane side to an image plane side: the ratio of the focal length of the three spherical lenses to the focal length of the whole zoom lens group sequentially satisfies the following conditions: (1.5,2.0), (1.5,2.2), (-4.5, -3.25).
5. The lens barrel as claimed in claim 1, wherein the diaphragm is an iris diaphragm, and the position of the diaphragm satisfies LS-L1a/TTL ∈ (0.49,0.57), wherein: l isS-L1The distance from the diaphragm to the front surface of the first lens in the first fixed lens group is defined, and the TTL is the total optical length of the zoom security lens, that is, the distance from the center vertex of the front surface of the first lens in the first fixed lens group to the image plane.
6. The lens barrel as claimed in claim 1, wherein the first cemented doublet is composed of a negative-focal-power spherical lens cemented with a positive-focal-power spherical lens; the second double cemented lens is formed by cementing a spherical lens with positive focal power and a spherical lens with negative focal power, and the ratio of the focal lengths of the six lenses to the focal length of the whole second fixed lens group satisfies the following requirements in sequence: (1.2,2.4), (-1.4, -0.75), (0.9,1.6), (0.6,1.1), (0.75,1.7), (-0.8, -0.4), the ratio of the combined focal length of the first and second cemented doublet to the focal length of the entire second fixed lens group C satisfies in sequence: (-7.4, -4.5), (-1.9, -1.0).
7. The lens barrel as claimed in claim 1, wherein the focusing lens group is a positive-power double cemented lens formed by a negative-power spherical lens and a positive-power spherical lens cemented together.
8. The lens barrel according to any one of claims 1 to 7, wherein the ratio of the focal length of the first fixed lens group, the variable power lens group, the second fixed lens group, and the focusing lens group to the focal length at the wide-angle end of the entire optical system satisfies, in order: (4.2,5.6), (-1.7, -0.95), (1.5,2.3), (2.3, 3.4).
9. The lens barrel according to claim 1, 2, 3 or 5, wherein refractive indices of the third and fourth lenses from the object side to the image plane side in the first fixed lens group satisfy, in order: (1.3,1.65), Abbe number satisfies in order: (60,100), (60, 100).
10. The lens barrel according to claim 1 or 4, wherein the refractive index of the third lens from the object side to the image plane side in the variable power lens group satisfies: (1.8,2.0), the abbe number satisfies: (15,40).
11. The lens barrel according to claim 1 or 6, wherein the refractive indices of the first, third and fifth lenses from the object side to the image plane side in the second fixed lens group satisfy, in order: (1.3,1.65), the abbe number satisfies in order: (60,100), (60, 100).
12. The lens barrel as claimed in claim 1, wherein the aspherical lens has a surface shape satisfying:
Figure FDA0003146878500000021
wherein: z is the height h of the aspheric surface along the optical axisThe distance vector sag of the aspheric vertex, c 1/R, R represents the radius of curvature of the mirror surface, K is conic coefficient, and A, B, C, D, E, F is a high-order aspheric coefficient.
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