CN101382644A - Zoom lens apparatus for recognizing eye iris mould - Google Patents
Zoom lens apparatus for recognizing eye iris mould Download PDFInfo
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- CN101382644A CN101382644A CNA200810071474XA CN200810071474A CN101382644A CN 101382644 A CN101382644 A CN 101382644A CN A200810071474X A CNA200810071474X A CN A200810071474XA CN 200810071474 A CN200810071474 A CN 200810071474A CN 101382644 A CN101382644 A CN 101382644A
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Abstract
The invention relates to a zoom lens apparatus used for an eye iris pattern recognition, consisting of a four-component mechanical compensation zoom lens and an eyeball alignment device. The zoom process requires air space on: D1 plus D2 equals C1, D3 plus l' equals C2, C1 and C2 are set values. By taking the measures of causing the distance TC equaling to C3 from the first surface of the lens to an image surface to be an invariable value, amending the cam curve pointwise, arranging two diaphragms to limit aperture beams and the like, that the image surface is stable without focusing can be ensured when object distance varies within the design range, leading the multiplying power value M and image space value NA of objective images to basically remain unchanged; an optical device also has to meet the following prerequisites: C1/fC short' is more than 1.24 and less than 1.32; l'/fC short' is more than 0.8; C3 is less than 4fC short'; f variable'/fC short' is more than 0.39 and less than 0.43; and Td-T760nm is less than 6lambda/(NA)<2>micron. The lens apparatus can lead the image surface to be stable, the multiplying power value M and image space value NA of objective images not to change with object distance and images to be clear in the conditions of change of the object distance within certain range.
Description
Technical field
The present invention relates to optical camera lens device; be used for supporting eye iris mould recognition system image acquisition; be specially adapted to key sector, military security, financial circles, special occasions passage gate inhibition, major cultural relic protection etc. and require the field of the strict authentication of identity such as high security, high reliability, also can be used for the back of the hand blood vessel, refer to the safety anti-fake system of other patterns such as vein.
Background technology
Because some position of human body and organ have uniqueness clearly, unchangeable property and be difficult to biological characteristic such as replicability makes them become the identification important basis.Along with the continuous development of high-speed computer image processing techniques, based on the identification of these biological characteristics, as people's face, fingerprint, the back of the hand blood vessel, refer to that vein, the identification of an eye iris isotype comes into social all trades and professions successively.Because advantages such as eye iris mould formula identification precision height, the antifalsification spy is good and almost can't duplicate have become the emphasis that all trades and professions identification system is developed.Currently, be used for the optical lens that eye iris mould formula recognition system image acquisition selects for use and be the camera lens that focuses distance and narrow spectral range.Because simple in structure, the revisal parameter that can adapt to different object distances and environmental change is less, obviously there is following deficiency in it: the one, must constantly focus to the target of activity to obtain distinct image in good time.Eye iris mould formula recognition system is to carry out image acquisition in that conjugate distance is short, so its focusing range is bigger (can not realize the collection of picture rich in detail by the depth of field), has reduced the opportunity to the image true-false collection; The 2nd, along with the variation of gathering target range, optical lens enlargement ratio and picture side NA value also constantly change, and have increased the burden of image processing function software.In addition, the adaptable spectral range of the fixed focus lens of choosing at present is narrow, can not the simultaneous adaptation visible light and the environmental baseline of near infrared lighting requirement.
Summary of the invention
The objective of the invention is to overcome the deficiency of said fixing focal length lens scheme, adopt the scheme of special varifocal structure, develop under a kind of condition that can in certain object distance scope, change, can keep all that image planes are stable, image multiplying power M and as square NA value basically not with object distance change, the Zoom lens apparatus for recognizing eye iris mould of clear picture.
Technical scheme of the present invention is to constitute like this:
A kind of Zoom lens apparatus for recognizing eye iris mould, it is characterized in that: it comprises eyeball aligning parts and zoom lens, described zoom lens is made of four constituent element mechanical compensation zoom lenses, four constituent elements are followed successively by that the change of preceding fixedly group, the negative power of positive light coke is doubly organized, the back fixedly group of positive light coke and the compensation group of positive light coke, and the focal length value of four constituent element correspondences is respectively
With
The back fixed light hurdle of the short focal length of control aperture light beam is set before group is fixed in the back, the preceding fixed light hurdle of long-focus aperture light beam in the control is set near becoming the last one side of times group, be used for guaranteeing that the NA value of picture side does not change with object distance basically; When the optical element of each constituent element was set, the optical element of each constituent element must meet the following conditions:
D
1+D
2＝C
1，
D
3+l′＝C
2，
TC＝C
3，
Wherein, D
1Be the doubly airspace between the group of preceding fixedly group and change, D
2Be the airspace that becomes between the preceding back fixed light hurdle of the fixing group of times group and back, D
3Be the airspace between fixing group in back and the compensation group, l ' is the airspace between last one side of compensation group and the image planes, T
cBe design main spectral line first distance of zoom lens when being the c spectral line to image planes, C
1, C
2, C
3Be the fixed value of setting according to actual request for utilization,
Be the shortest focal length value of zoom lens when main spectral line is the c spectral line.
First three constituent element is carrying out in the process of varifocal with the object distance change, and its outgoing beam trend is far away burnt.C
1And C
2To choose be to be decided by the object distance moving range of actual request for utilization and the structural requirement of optical system.In order to realize when object distance changes, need not focus just guaranteeing that image planes are stable, also set during design the zoom lens in object distance change process its first between image planes apart from T
cBe certain value, i.e. T
c=C
3
According to actual request for utilization, the eye iris target that is taken by the surplus of special exercise scope when moving on to the shortest object distance, its image multiplying power should remain constant, is beneficial to increase catch grab time, number of times and the comparative that an iris is taken, thereby improves the reliability that the identification true and false is distinguished.For reaching this specific practical requirement, apparatus of the present invention have been carried out following improvement to technique scheme: change and carry out in the process of zoom in good time in object distance, becoming doubly, the optical element of group and compensation group is to adjust synchronously according to the change times Compensation Cam of correspondence; A described change times Compensation Cam is in advance according to image optical imagery rule, and the displacement of object distance and corresponding focal length value and image multiplier value M are obtained in pointwise roughly earlier, then by continuous correction D
1And D
3Value reaches unanimity image multiplier value M in the process that changes object distance, the change that forms after a pointwise correction times Compensation Cam is two nonlinear curves.
For adapting to the requirement of different lighting conditions (as white light or near infrared light illumination), the further improvement of apparatus of the present invention is: the scheme that adopts Chinese utility model patent (ZL2004 20048615.3) to provide, described zoom lens is designed to the confocal pattern of wide spectrum, the SPECTRAL REGION scope that is about to wavelength and is the broad of 486.1nm-900nm is (usually during initial designs, it is the near infrared region of 656.3nm-900nm that its main spectral line is selected in c spectral line-656.3nm) resolve into visible region and the wavelength that wavelength is 486.1nm-656.3nm, the design main spectral line of visible region and near infrared region is respectively d spectral line (587.6nm) and 760nm spectral line, and the deviator of two main spectral lines must meet the following conditions when being provided with: T
d-T
760nm＜6 λ/(NA)
2Micron ... 5..Camera lens designs respectively by two SPECTRAL REGION of decomposing, and requires them to carry out the evaluation of image quality on totally one imaging surface.All reach favorable imaging quality until two SPECTRAL REGION in totally one image planes through image difference balance repeatedly.
Than prior art, the invention has the advantages that: Zoom lens apparatus for recognizing eye iris mould of the present invention, adopt the zoom lens of mechanical compensation Zoom structure form to substitute the scheme of the fixed focal length structure of employing at present, overcome the constantly focusing deficiency that just can get a distinct image of fixed focus lens, adopt simultaneously and the conventional fixed light hurdle that becomes the different cams of times Compensation Cam and two control aperture beam size are set, guarantee the image multiplier value M of new invention device and do not change basically with object distance as square NA value, reduce the pressure of Flame Image Process computing, increase the opportunity and the comparative of gathering the eye iris image, the false proof reliability of raising system.In addition, for adapting to the requirement of different lighting conditions (white light or near infrared light illumination), zoom lens of the present invention is designed to the confocal form of wide spectrum.Under the confocal condition of wide spectrum, when spatial frequency is 50lp/mm, the minimum mtf value of each visual field of different object distances is all greater than 0.3,
Wherein the mtf value in white-light spectrum zone is all greater than 0.4.
Description of drawings
Fig. 1 is the optical texture synoptic diagram of Zoom lens apparatus for recognizing eye iris mould of the present invention.Among the figure: R
1, R
2, R
3Be followed successively by the radius-of-curvature of each face of lens; d
1, d
2, d
3Be followed successively by the thickness of each lens, D
1, D
2, D
3Be followed successively by the space interval between each lens; L ' is picture side's rear cut-off distance of zoom lens, and above-mentioned unit is mm; 1-13 represents 13 lens successively, 14 expression completely reflecting mirrors, 15 expression Quasi-straight light-focusing mirrors, 16 expression white light sources.
Fig. 2 is the change times Compensation Cam synoptic diagram of zoom lens's employing of Zoom lens apparatus for recognizing eye iris mould of the present invention.
Fig. 3 is that apparatus of the present invention zoom lens is at horizontal multiplying power M=-0.122, NA=0.135, maximum true field 2 η=36.85mm, under the situation of T=102.32mm, when object distance is 100 millimeters, (a) and (b), (c) represent respectively white light field d (F, C), near infrared region 760nm (C, 900nm), territory, wide spectral range C (F, 900nm) the MTF curve under the condition.Wherein " 1 ', 2 ', 3 ' " represent respectively that axle is gone up, the MTF curve of 0.707 ω and 1 ω, the horizontal ordinate of MTF curve is: line is right/mm.
Fig. 4 is that apparatus of the present invention zoom lens is at horizontal multiplying power M=-0.122, NA=0.135, maximum true field 2 η=36.85mm, under the situation of T=102.32mm, when object distance is 250 millimeters, (a) and (b), (c) represent respectively white light field d (F, C), near infrared region 760nm (C, 900nm), territory, wide spectral range C (F, 900nm) the MTF curve under the condition.Wherein " 1 ", 2 ", 3 " " respectively expression axle go up, the MTF curve of 0.707 ω and 1 ω, the horizontal ordinate of MTF curve is: line is right/mm.
Fig. 5 is that apparatus of the present invention zoom lens is at horizontal multiplying power M=-0.122, NA=0.135, maximum true field 2 η=36.85mm, under the situation of T=102.32mm, when object distance is 500 millimeters, (a) and (b), (c) represent respectively white light field d (F, C), near infrared region 760nm (C, 900nm), territory, wide spectral range C (F, 900nm) the MTF curve under the condition.Wherein " 1 " ', 2 " ', 3 " ' " respectively the expression axle go up, the MTF curve of 0.707 ω and 1 ω, the horizontal ordinate of MTF curve is: line is right/mm.
Fig. 6 is the optical-mechanical contour structures synoptic diagram of Zoom lens apparatus for recognizing eye iris mould of the present invention.
Embodiment
Below in conjunction with Figure of description and specific embodiment content of the present invention is elaborated:
Zoom lens apparatus for recognizing eye iris mould of the present invention comprises zoom lens and eyeball aligning parts.Be illustrated in figure 1 as a kind of embodiment organigram provided by the invention, the material that constitutes 13 lens of zoom lens among the figure is followed successively by: ZF
7, ZK
3, ZK
3, LaK
2, ZK
7, ZF
7, LaK
7, QF
3, ZK
7, ZK
3, ZK
9, ZF
13, LaK
12Its profile is followed successively by: 1-convex-concave negative lens, 2-biconvex positive lens, 3-convex-concave positive lens, 4-convex-concave negative lens, 5-biconvex positive lens, 6-concave-concave positive lens, 7-convex-concave positive lens, 8-biconvex positive lens, the concavo-convex negative lens of 9-, 10-convex-concave negative lens, 11-biconvex positive lens, 12-biconvex positive lens, 13-double-concave negative lens.Wherein lens 1 and lens 2, lens 5 and lens 6, lens 9 and lens 10, lens 12 and lens 13 are formed balsaming lens respectively.What apparatus of the present invention were selected for use is four constituent element mechanical compensation Zoom structure forms, and that the focal power of its each constituent element is respectively is positive and negative, just, just.Wherein lens 1 to lens 3 are zoom lens's preceding fixedly group, and its complex focus is made as
Lens 4 are doubly organized for zoom lens's change to lens 6, and its complex focus is made as
Lens 7 to lens 8 are zoom lens's back fixedly group, and its complex focus is made as
Lens 9 to lens 13 are zoom lens's compensation group, with
The complex focus of representing it.First three constituent element makes its emergent ray trend far away burnt in the process that object distance changes.In the camera lens zoom process, require the preceding fixing airspace value of organizing and becoming between doubly organizing (to be made as D
1) and the airspace value that becomes between the preceding light hurdle of doubly group and the fixing group in back (be made as D
2) the fixed value C of sum for setting
1, i.e. D
1+ D
2=C
1Also require the airspace value between fixing group in back and the compensation group (to be made as D simultaneously
3) and camera lens picture side rear cut-off distance (being made as l ') sum be the fixed value C of another setting
2, i.e. D
3+ l '=C
2In order under the situation of not setting up focusing structure, to guarantee the stability of image planes, the zoom lens in object distance change process its first to image planes apart from T
cRemain constant.In order to increase the timeliness and the comparative of catching the eyeball image, be beneficial to the true and false of identification and the efficient of raising computer picture software processes, the object distance and accordingly focal length value and image multiplier value and constantly correction D of optical devices of the present invention by obtaining the pointwise displacement
1And D
3The airspace value guarantees that image multiplying power M does not change with the variation of object distance; Simultaneously by becoming the doubly last one side of group A
1On the position and back fixing group front A
2On constant aperture light hurdle is set respectively, make the NA value of picture side constant substantially.In addition, for adapting to the requirement of different lighting conditions (white light or near infrared light), the zoom lens is designed to the confocal pattern of wide spectrum.
Among Fig. 1, the eyeball aligning parts that the present invention program adopts is made up of completely reflecting mirror 14, Quasi-straight light-focusing mirror 15 and the white light source 16 (white light source can be led light source) of little garden, a slice center spot printing opacity.
The concrete structure of zoom lens in the Zoom lens apparatus for recognizing eye iris mould of the present invention and eyeball aligning parts is not limited to the foregoing description, wherein, the eyeball aligning parts also can adopt existing other structure, and, also can allow eyes and zoom lens with parallel angle or other arbitrarily angled incident except eyes shown in Figure 1 and zoom lens adopt the vertical angle incident.In addition, the number, material and the shape that constitute zoom lens's lens all can be set according to the occasion of concrete application, but the optical element that constitutes four constituent elements when being provided with must satisfy following condition:
D
1+D
2＝C
1，
D
3+l′＝C
2，
TC＝C
3，
T
d-T
760nm＜6 λ/(NA)
2Micron ... 5.
Setting the above-mentioned purpose that must satisfy is:
The purpose that 1. condition is set is that the change that guarantees the zoom lens is doubly organized and moved on to longly when can not collide with the fixing group in back when burnt, and control becomes group doubly to move to short amount of movement when burnt little as far as possible, is beneficial to the miniaturization of camera lens.
The purpose that 2. condition is set is when guaranteeing that image planes are stable, makes rear cut-off distance bigger space be arranged to adapt to the contour structures needs of C type and CS type interface.
The purpose that 3. condition is set is when object distance changes, and need not focus and just can guarantee the stability of image planes, also plays a part the restriction lens length simultaneously.
The purpose that 4. condition is set is that the control zoom lens becomes the doubly displacement of group, and fixing group bore is beneficial to the miniaturization of system before can dwindling, and will prevent that meanwhile higher order aberrations from increasing too much.
The purpose that 5. condition is set is that it is controlled in picture side's field depth all the time at the imaging surface of the design main spectral line of two SPECTRAL REGION in zoom lens's zoom process, guarantees that image planes image quality stable and that proofreaied and correct is constant.
The principal character of Zoom lens apparatus for recognizing eye iris mould of the present invention is: adopt zoom lens structure (becoming about 4 times of multiple proportions), substitute the scheme of the fixed focal length structure that adopts at present, overcome fixed focus lens and change the deficiency that needs continuous focusing just can get a distinct image with object distance.Adopt special change times mechanical compensation cam curve structure and the constant aperture light hurdle that two diverse locations are set simultaneously, guarantee the image multiplying power M of new invention device and do not change basically with object distance as square NA value, be beneficial to and alleviate the pressure that image software is handled, increase the time and the comparability of gathering the eye iris image, the reliability that the raising system is false proof.In addition, for adapting to different lighting conditions, neoteric zoom lens is designed to the confocal form of wide spectrum.Zoom lens apparatus for recognizing eye iris mould provided by the invention, between object distance variation range 100mm to 500mm, maximum object height is 36.55mm, T=102.32mm, picture side NA=0.135, image multiplying power m=-0.122 is during spatial resolution 50lp/mm, the mtf value of its each SPECTRAL REGION, each visual field is all greater than 0.3, and wherein the mtf value of white light field is all greater than 0.4.
Table 1 is the embodiment data (carrying out normalization by C spectral line shortest focal length) of apparatus of the present invention
Object distance l=4.483031～11.207581～22.415162 (mm)
Picture side F
NO=(3.5,3.57,3.64)
Colour killing spectral line C (F, d, 760nm, 900nm)
N in the table 1
1, n
2, n
3Be followed successively by the refractive index of each lens glass material; υ
1, υ
2, υ
3Be followed successively by the Abbe coefficient of the glass material of each lens correspondence.R
1, R
2, R
3Be followed successively by the radius-of-curvature of each face of lens; d
1, d
2, d
3Be followed successively by the thickness of each lens, D
1, D
2, D
3Be followed successively by the space interval between each lens; L ' is picture side's rear cut-off distance of zoom lens, and above-mentioned unit is mm;
Table 1
| Sequence number | R(mm) | d(mm) | n d | v d | The remarks explanation |
| The |
|||||
| 1 | 2.585275 | 0.0717285 | 1.80627 | 25.37 | ZF 7 |
| 2 | 1.276947 | 0.3138122 | 1.58919 | 61.25 | ZK 3 |
| 3 | -5.077033 | 0.00448303 | |||
| 4 | 1.068844 | 0.134491 | 1.58919 | 61.25 | |
| 5 | 1.789626 | |
|||
| 6 | 1.531179 | 0.0313812 | 1.69211 | 54.54 | |
| 7 | 0.412618 | 0.197253 | |||
| 8 | -0.544688 | 0.0313812 | 1.61309 | 60.58 | ZK 7 |
| 9 | 0.544688 | 0.121042 | 1.80627 | 25.37 | ZF 7 |
| 10 | 4.619316 | D 2 | Middle long burnt time field is put | ||
| 11 | ∞ | 0.0537964 | Short burnt time field is put | ||
| 12 | 1.712518 | 0.116559 | 1.713 | 53.83 | laK 7 |
| 13 | -1.301872 | 0.0555896 | |||
| 14 | -0.628745 | 0.0313812 | 1.57502 | 41.31 | QF 3 |
| 15 | -1.323839 | |
|||
| 16 | 2.480910 | 0.0313812 | 1.80627 | 25.37 | ZF 7 |
| 17 | 0.591222 | 0.179321 | 1.58919 | 61.25 | ZK 3 |
| 18 | -1.202349 | 0.00448303 | |||
| 19 | 0.838327 | 0.121042 | 1.62041 | 60.29 | ZK 9 |
| 20 | -4.340919 | 0.103110 | |||
| 21 | 3.983891 | 0.0762115 | 1.78472 | 25.76 | ZF 13 |
| 22 | -7.715297 | 0.0313812 | 1.69680 | 56.18 | laK 12 |
| 23 | 1.082921 | l′ | |||
| 24 | The ∞ image planes |
Wherein: D
1+ D
2=1.255249 (mm), D
3+ l '=1.621961 (mm), first to image planes apart from T=4.587038 (mm).
Table 2 is to become the corresponding mobile spacing value of the main object distance of times compensated curve in apparatus of the present invention example.
Table 2
| Sequence number | Object distance l (mm) | Focal distance f ' (mm) | D 1(mm) | D 2(mm) | D 3(mm) | l′(mm) | |
| 1 | 4.483031 | 1 | 0.724906 | 0.530343 | 0.674024 | 0.947937 | -0.1218 |
| 2 | 11.207581 | 2.07740 | 1.023476 | 0.231773 | 0.555 | 1.066962 | -0.1219 |
| 3 | 22.415162 | 3.95410 | 1.248883 | 0.006366 | 0.731990 | 0.889972 | -0.1210 |
Table 3 is that apparatus of the present invention embodiment is in the NA of different object distances value and primary aberration value (carrying out normalization by C spectral line shortest focal length).
Table 3
| Sequence number | Object distance l (mm) | NA | ∑S 1 | ∑S 2 | ∑S 3 | ∑S 4 | ∑S 5 | ∑C 1 | ∑ |
| 1 | 4.483031 | 0.140 | 0.00021 | -0.00017 | 0.00007 | -0.000034 | -0.00037 | -0.00017 | 0.000071 |
| 2 | 11.207581 | 0.133 | 0.00020 | -0.00015 | 0.00009 | -0.000032 | -0.00013 | -0.000186 | 0.000022 |
| 3 | 22.415162 | 0.136 | 0.00031 | 0.000014 | 0.00007 | 0.000034 | 0.00002 | -0.00027 | -0.00008 |
The focal length value of each constituent element of varifocal after the normalization:
Claims (3)
1. Zoom lens apparatus for recognizing eye iris mould, it is characterized in that: it comprises eyeball aligning parts and zoom lens, described zoom lens is made of four constituent element mechanical compensation zoom lenses, four constituent elements are followed successively by that the change of preceding fixedly group, the negative power of positive light coke is doubly organized, the back fixedly group of positive light coke and the compensation group of positive light coke, and the focal length value of four constituent element correspondences is respectively
With
The back fixed light hurdle of the short focal length of control aperture light beam is set before group is fixed in the back, the preceding fixed light hurdle of long-focus aperture light beam in the control is set near becoming the last one side of times group, be used for guaranteeing that the NA value of picture side does not change with object distance basically; When the optical element of each constituent element was set, the optical element of each constituent element must meet the following conditions:
D
1+D
2＝C
1，
D
3+l′＝C
2，
T
C＝C
3，
Wherein, D
1Be the doubly airspace between the group of preceding fixedly group and change, D
2Be the airspace that becomes between the preceding back fixed light hurdle of the fixing group of times group and back, D
3Be the airspace between fixing group in back and the compensation group, l ' is the airspace between last one side of compensation group and the image planes, T
CBe design main spectral line first distance of zoom lens when being the c spectral line to image planes, C
1, C
2, C
3Be the fixed value of setting according to actual request for utilization,
Be the shortest focal length value of zoom lens when main spectral line is the c spectral line.
2. Zoom lens apparatus for recognizing eye iris mould according to claim 1, it is characterized in that: change and carry out in the process of zoom in good time in object distance, becoming doubly, the optical element of group and compensation group is to adjust synchronously according to the change times Compensation Cam of correspondence; A described change times Compensation Cam is in advance according to image optical imagery rule, and the displacement of object distance and corresponding focal length value and image multiplier value M are obtained in pointwise roughly earlier, then by continuous correction D
1And D
3Value reaches unanimity image multiplier value M in the process that changes object distance, the change that forms after a pointwise correction times Compensation Cam is two nonlinear curves.
3. Zoom lens apparatus for recognizing eye iris mould according to claim 1, it is characterized in that: described zoom lens is designed to the confocal pattern of wide spectrum, it is the near infrared region of 656.3nm-900nm that the SPECTRAL REGION scope that is about to wavelength and is the broad of 486.1nm-900nm resolves into visible region and the wavelength that wavelength is 486.1nm-656.3nm, the design main spectral line of visible region and near infrared region is respectively d spectral line and 760nm spectral line, first the distance that calculates by two main spectral lines, i.e. T to the optimal imaging face
dAnd T
760nmIts bias must meet the following conditions:
T
d-T
760nm＜6 λ/(NA)
2Micron ... 5..
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|---|---|---|---|
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|---|---|---|---|
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