CN103268488B - A kind of wet finger print harvester - Google Patents
A kind of wet finger print harvester Download PDFInfo
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- CN103268488B CN103268488B CN201310191208.1A CN201310191208A CN103268488B CN 103268488 B CN103268488 B CN 103268488B CN 201310191208 A CN201310191208 A CN 201310191208A CN 103268488 B CN103268488 B CN 103268488B
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Abstract
A kind of wet finger print harvester, comprise housing and be arranged on the optical finger print image-forming module in housing, optical finger print image-forming module comprises complies with prism, image-forming objective lens, the fingerprint image acquisition unit that light path arranges, and LED light source, prism is that refractive index is at least the prism that 1.7 glass is made; Light path between prism and image-forming objective lens is provided with the first plane mirror and the second plane mirror, the large end face angle of the first plane mirror and prism is 97.1 °, the light of its reflection enters the second plane mirror, the large end face angle of the second plane mirror and prism is 13 °, and the light of its reflection directly enters image-forming objective lens. Efficiently solve existing fingerprint acquisition device and cause not collecting the problem of the wet finger print image of high-quality lower than the refractive index of glass because of the refractive index of water, the wet finger print image gathering can clearly be seen fingerprint lines, can be used for registering comparison, also obviously reduce the volume of wet finger print harvester.
Description
Technical field
The present invention relates to method or device that applying electronic circuit carries out bio-identification, particularly relate to onePlant wet finger print harvester.
Background technology
Fingerprint identification technology has convenience, reliable, non-infringement and the low feature of cost compare, by userFinger print data is assigned to corresponding fingerprint verifying apparatus, can upload in real time fingerprint and press record, and generation refers toLine is pressed form, for the accident of tracing provides foundation. The fingerprint quality of fingerprint recognition and collection is closely related,Gathered person's finger is had to corresponding requirement, be especially applied to gate inhibition or outdoor fingerprint collectingDevice, has stricter requirement to gathered person's finger, for example finger can not be too wet, too dry orPeel too serious. But finger can be perspired or touched water unavoidably and become wet in actual life,Because the refractive index of water is lower than the refractive index of glass, directly have influence on the wet hand of existing fingerprint capturer collectionThe quality that refers to fingerprint image, the fingerprint image quality collecting is very poor, can't see fingerprint lines, can notRegister comparison.
Summary of the invention
Technical problem to be solved by this invention is the defect that makes up above-mentioned prior art, provides a kind of wetFinger print harvester.
Technical problem of the present invention is solved by the following technical programs.
This wet finger print harvester, comprises housing and the optics that is arranged in described housing refers toLine image-forming module, described optical finger print image-forming module comprise the prism, image-forming objective lens complying with light path and arrange,Be provided with colored complementary metal oxide semiconductors (CMOS) (ComplementaryMetalOxideSemicon-Ductor, initialism is CMOS) the fingerprint image acquisition unit of chip, and light emitting diode(LightEmittingDiode, initialism is LED) light source, described prism is six Dove prisms,Include large end face, small end face, downside and its excess-three side, described large end face is IMAQFace, described small end face is that light source is injected face, described downside is the image planes relative with image-forming objective lens.
The feature of this wet finger print harvester is:
Described prism is that refractive index is at least the prism that 1.7 glass is made, and it is higher than general glass systemThe refractive index of prism of doing, can effectively solve existing fingerprint acquisition device because the refractive index of water is lower than glassThe refractive index of glass and causing does not collect the problem of the wet finger print image of high-quality.
Light path between described prism and described image-forming objective lens is provided with the first plane mirror and second flatFace speculum, the angle of the large end face of described the first plane mirror and described prism is 97.1 °, it is anti-The light of penetrating enters the second plane mirror, the large end face of described the second plane mirror and described prismAngle be 13 °, the light of its reflection directly enters described image-forming objective lens.
The light that described LED light source sends enters prism through the small end face of described prism, described in being pressed againstA part for finger reflection ray on the large end face of prism, injects to institute by the downside of described prismState on the first plane mirror, the light of described the first plane mirror reflection enters the second plane reflectionMirror, the light of described the second plane mirror reflection directly enters described image-forming objective lens, and through described one-tenthAs object lens disappear distortion, aberration, the image in light images in the colour of described fingerprint image acquisition unitOn the photosurface of CMOS chip, and convert signal of telecommunication output to. Adopt two plane mirrors to carry outTwo secondary reflections, light is broken line, can obviously reduce the volume of fingerprint acquisition device, realizes miniaturization.
Technical problem of the present invention is solved by following further technical scheme.
Described the first plane mirror is the rectangular-shaped thin plate mirror that only has a mirror surface.
Described the second plane mirror is the rectangular-shaped thin plate mirror that only has a mirror surface.
Described image-forming objective lens is lens, the primary optical axis of described image-forming objective lens and described prism large end faceAngle be 21 °.
Between the rear of described housing and the mainboard of described fingerprint image acquisition unit, be provided with image-forming objective lensBase, clamps fixing by the locating hole on described housing and described fingerprint image acquisition unit mainboard.
Described LED light source is at least 1 visible or infrared light LED light source, is arranged on independentlyOn lamp plate, be positioned at the small end face below of described prism, parallel with small end face just right, can be used as lastingLight source, uses for a long time.
Technical problem of the present invention by below further technical scheme solved.
Described fingerprint image acquisition unit is colored complementary metal oxide semiconductors (CMOS) (ComplementaryMetal-Oxide-Semiconductor, initialism is CMOS) sensor, its motherboard circuit comprisesColor cmos chip, main control chip, crystal oscillator, memory cell chip, encryption chip,Low pressure difference linear voltage regulator (LowDropoutLinearRegulator, initialism is LDO), multiplePosition circuit, and data communication interface, described color cmos chip respectively with memory cell chip,LDO connects, described main control chip respectively with crystal oscillator, memory cell chip, encryption chip,LDO, reset circuit and data communication interface connect, described LDO also respectively with memory cell coreSheet, data communication interface and described LED light source connect.
Described color cmos chip is arranged in the image planes of described image-forming objective lens, and and image-forming objective lensThe angle of primary optical axis be 77.8 °.
The photosurface of described color cmos chip is 5mm to the back focal length of described image-forming objective lens.
The photosurface of described color cmos chip gathers the image in the light presenting on itFingerprint image converts signal of telecommunication output to, described main control chip for finger collection, finger-image proofread and correct,Data communication and output are controlled, and described crystal oscillator is for providing clock signal to main control chip, instituteState memory cell chip for memory function file, to complete registration and identification after collection, described inEncryption chip is used for downloading own software algorithm and code, to gathered person's significant data provide comprehensive,The protection of high degree of safety, safeguards self rights and interests, avoids software piracy, and described LDO is for will be fromThe backward color cmos chip of power supply step-down and the main control chip of data communication interface provide power supply, instituteState reset circuit for providing reset signal to main control chip, described data communication interface is used for and calculatingMachine is combined use, with the wet finger print collection of completing user, wet finger print comparison, abnormal alarm,Control signal output function, effectively improves wet finger print acquisition rate and accuracy of identification.
The beneficial effect that the present invention is compared with the prior art is:
The present invention adopts refractive index to be at least the prism that 1.7 glass is made, and it is higher than general glassRefractive index, efficiently solves existing fingerprint acquisition device because the refractive index of water is lower than the refractive index of glassCause not collecting the problem of the wet finger print image of high-quality; The wet finger print image gathering can be clearClearly see fingerprint lines, can be used for registering comparison. In addition, adopt two plane mirrors to comply withLight path reasonably reflects, and can improve space utilization efficiency, obviously reduces wet finger print collectionThe volume of device, realizes miniaturization, makes its application more extensive.
Brief description of the drawings
Fig. 1 is the index path of the specific embodiment of the invention;
Fig. 2 is the motherboard circuit composition square frame of the fingerprint image acquisition unit of the specific embodiment of the inventionFigure.
Detailed description of the invention
Below in conjunction with detailed description of the invention and contrast accompanying drawing the present invention will be described.
A wet finger print harvester as shown in Fig. 1～2, comprises housing and is arranged on housingIn optical finger print image-forming module, optical finger print image-forming module comprise comply with light path arrange prism 1,Image-forming objective lens 6, be provided with the fingerprint image acquisition unit 5 of color cmos chip and LED light source4, prism 1 is that model that the bright Co., Ltd in Chengdu produces is six of making of environmental protection H-LAK7Dove prism, glass refraction is 1.713, prism 1 include large end face, small end face, downside andIts excess-three side, large end face is IMAQ face, small end face is that light source is injected face, downside be withThe image planes that image-forming objective lens 6 is relative. Image-forming objective lens 6 is lens, the primary optical axis of image-forming objective lens 6 withThe angle of prism 1 large end face is 21 °. Prism 1 has the refraction of the prism of making higher than general glassRate, can effectively solve existing fingerprint acquisition device and lead lower than the refractive index of glass because of the refractive index of waterCause the problem that does not collect the wet finger print image of high-quality.
Light path between prism 1 and image-forming objective lens 6 is provided with the first plane mirror 2 and the second planeSpeculum 3, the first plane mirrors 2 are 97.1 ° with the angle of the large end face of prism 1, its reflectionLight enters the second plane mirror 3, the second plane mirrors 313 °, the light of its reflection directly enters image-forming objective lens 6. The first plane mirror 2 and the second plane are anti-Penetrating mirror 3 is all the rectangular-shaped thin plate mirror that only has a mirror surface.
Between the rear of housing and the mainboard of fingerprint image acquisition unit 5, be provided with image-forming objective lens base,Clamp fixing by the locating hole on housing and fingerprint image acquisition unit 5 mainboards.
LED light source 4 is at least 1 visible or infrared light LED light source, is arranged on independently lampOn plate, be positioned at the small end face below of prism 1, parallel with small end face just right, can be used as lasting light source,Long-time use. The light that LED light source 4 sends enters prism 1 through the small end face of prism 1, is pressedA part for finger reflection ray on the large end face of prism 1, is injected to by the downside of prism 1On the first plane mirror 2, the light that the first plane mirror 2 reflects enters the second plane mirrorThe light that 3, the second plane mirrors 3 reflect directly enters image-forming objective lens 6, and disappears through image-forming objective lens 6Distortion, aberration, the image in light images in the color cmos chip of fingerprint image acquisition unit 5Photosurface on, and convert signal of telecommunication output to. Adopt two plane mirrors to carry out two secondary reflections,Light is broken line, can obviously reduce the volume of fingerprint acquisition device, realizes miniaturization.
Fingerprint image acquisition unit 5 is color cmos sensors, and its motherboard circuit comprises Ge Kewei(Galaxycore) 1/4 inch of coloured silk that model is GC0303 that electronics (Shanghai) Co., Ltd. producesLook CMOS chip, main control chip, crystal oscillator, memory cell chip, encryption chip, lowPressure reduction linear voltage regulator LDO, reset circuit, and data communication interface, color cmos chipBe connected with memory cell chip, LDO respectively, main control chip respectively with crystal oscillator, memory cellChip, encryption chip, LDO, reset circuit and data communication interface connect, and LDO also distinguishesBe connected with memory cell chip, data communication interface and described LED light source. GC0303 colourLaterally minimum is 684DPI to the DPI resolution ratio of CMOS chip, longitudinally minimum is 756DPI, maximumTrapezoidal distortion amount is 4.1%, is of a size of 43.1mm × 22mm × 22.4mm.
Color cmos chip is arranged in the image planes of image-forming objective lens, and with the primary optical axis of image-forming objective lensAngle be 77.8 °. The photosurface of color cmos chip is 5mm to the back focal length of image-forming objective lens.
The fingerprint that photosurface of color cmos chip gathers the image in the light presenting on itImage converts signal of telecommunication output to, and main control chip leads to for finger collection, finger-image correction, dataNews and output are controlled, and crystal oscillator is for providing clock signal to main control chip, memory cell chipFor memory function file, to complete registration and the identification after collection, encryption chip is used for downloading certainlyThere are software algorithm and code, provide protection comprehensive, high degree of safety to gathered person's significant data,Safeguard self rights and interests, avoid software piracy, LDO is for falling the power supply from data communication interfacePress backward color cmos chip and main control chip that power supply is provided, reset circuit is used for to main control chipReset signal is provided, and data communication interface is for combining use with computer, with the wet finger of completing userFingerprint collecting, wet finger print comparison, abnormal alarm, control signal output function, effectively improve wetFinger print acquisition rate and accuracy of identification.
Above content is in conjunction with concrete preferred embodiment further description made for the present invention,Can not assert that specific embodiment of the invention is confined to these explanations. For the technical field of the inventionThose of ordinary skill, make without departing from the inventive concept of the premise some be equal to substitute orObviously modification, and performance or purposes are identical, all should be considered as belonging to the present invention by submitted to rightThe scope of patent protection that claim is definite.
Claims (9)
1. a wet finger print harvester, comprises housing and is arranged on the optics in described housingFingerprint imaging module, described optical finger print image-forming module comprises complies with prism, the imaging thing that light path arrangesMirror, be provided with the fingerprint image acquisition unit of colored complementary metal oxide semiconductors (CMOS) CMOS chip, withAnd LED light source, described prism is six Dove prisms, includes large end face, small endFace, downside and its excess-three side, described large end face is IMAQ face, described small end face is lightFace is injected in source, and described downside is the image planes relative with image-forming objective lens, it is characterized in that:
Described prism is that refractive index is at least the prism that 1.7 glass is made;
Light path between described prism and described image-forming objective lens is provided with the first plane mirror and second flatFace speculum, the angle of the large end face of described the first plane mirror and described prism is 97.1 °, it is anti-The light of penetrating enters the second plane mirror, the large end face of described the second plane mirror and described prismAngle be 13 °, the light of its reflection directly enters described image-forming objective lens, described LED light source sendsLight enter prism through the small end face of described prism, be pressed against the finger on the large end face of described prismA part for reflection ray, is injected on described the first plane mirror by the downside of described prism,The light of described the first plane mirror reflection enters the second plane mirror, described the second plane reflectionThe light of mirror reflection directly enters described image-forming objective lens, and through described image-forming objective lens disappear distortion, aberration,Image in light images in the photosurface of the color cmos chip of described fingerprint image acquisition unitUpper, and convert signal of telecommunication output to.
2. wet finger print harvester as claimed in claim 1, is characterized in that:
Described the first plane mirror is the rectangular-shaped thin plate mirror that only has a mirror surface.
3. wet finger print harvester as claimed in claim 1, is characterized in that:
Described the second plane mirror is the rectangular-shaped thin plate mirror that only has a mirror surface.
4. wet finger print harvester as claimed in claim 2 or claim 3, is characterized in that:
Described image-forming objective lens is lens, the primary optical axis of described image-forming objective lens and described prism large end faceAngle be 21 °.
5. wet finger print harvester claimed in claim 4, is characterized in that:
Between the rear of described housing and the mainboard of described fingerprint image acquisition unit, be provided with imaging thingMirror base, clamps fixing by the locating hole on described housing and described fingerprint image acquisition unit mainboard.
6. wet finger print harvester as claimed in claim 5, is characterized in that:
Described LED light source is at least 1 visible or infrared light LED light source, is arranged on independentlyOn lamp plate, be positioned at the small end face below of described prism, parallel with small end face just right.
7. wet finger print harvester as claimed in claim 6, is characterized in that:
Described fingerprint image acquisition unit is color cmos sensor, and its motherboard circuit comprises colourCMOS chip, main control chip, crystal oscillator, memory cell chip, encryption chip, low voltage differenceLinear voltage regulator LDO, reset circuit, and data communication interface, described color cmos chipBe connected with memory cell chip, LDO respectively, described main control chip respectively with crystal oscillator, storageUnit chip, encryption chip, LDO, reset circuit and data communication interface connect, described LDOAlso be connected respectively described colour with memory cell chip, data communication interface and described LED light sourceThe fingerprint image conversion that photosurface of CMOS chip gathers the image in the light presenting on itBecome signal of telecommunication output, described main control chip for finger collection, finger-image correction, data communication andOutput is controlled, and described crystal oscillator is for providing clock signal to main control chip, described memory cellChip is for memory function file, to complete registration and the identification after collection, described encryption chip is usedIn downloading own software algorithm and code, provide comprehensive, high degree of safety to gathered person's significant dataProtection, safeguard self rights and interests, avoid software piracy, described LDO is for will be from data communicationThe backward color cmos chip of power supply step-down and the main control chip of interface provide power supply, described reset electricityRoad is for providing reset signal to main control chip, and described data communication interface is for combining and make with computerWith, with the wet finger print collection of completing user, wet finger print comparison, abnormal alarm, control signalOutput function.
8. wet finger print harvester as claimed in claim 7, is characterized in that:
Described color cmos chip is arranged in the image planes of described image-forming objective lens, and and image-forming objective lensThe angle of primary optical axis be 77.8 °.
9. wet finger print harvester as claimed in claim 8, is characterized in that:
The photosurface of described color cmos chip is 5mm to the back focal length of described image-forming objective lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310191208.1A CN103268488B (en) | 2013-05-21 | 2013-05-21 | A kind of wet finger print harvester |
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| CN201310191208.1A CN103268488B (en) | 2013-05-21 | 2013-05-21 | A kind of wet finger print harvester |
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| CN103268488A CN103268488A (en) | 2013-08-28 |
| CN103268488B true CN103268488B (en) | 2016-05-18 |
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| CN110945525B (en) * | 2019-10-31 | 2023-08-22 | 深圳市汇顶科技股份有限公司 | Fingerprint identification method, fingerprint identification device and electronic equipment |
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| FR2862408A1 (en) * | 2003-11-14 | 2005-05-20 | Sagem | Fingerprint imaging system used in e.g. banking machines, includes illuminated plate through which light reflected from finger is propagated to mirror and focussing lens |
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| CN102496014A (en) * | 2011-12-06 | 2012-06-13 | 长春方圆光电技术有限责任公司 | Optical fingerprint acquisition system for living body finger identification |
| CN102667675A (en) * | 2009-09-30 | 2012-09-12 | 夏普株式会社 | Optical pointing device and electronic equipment provided with the same, and light-guide and light-guiding method |
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2013
- 2013-05-21 CN CN201310191208.1A patent/CN103268488B/en active Active
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|---|---|---|---|---|
| JPH05134105A (en) * | 1991-11-14 | 1993-05-28 | Nhk Spring Co Ltd | Thin-type polarizing prism structure |
| FR2862408A1 (en) * | 2003-11-14 | 2005-05-20 | Sagem | Fingerprint imaging system used in e.g. banking machines, includes illuminated plate through which light reflected from finger is propagated to mirror and focussing lens |
| CN101485570A (en) * | 2008-01-16 | 2009-07-22 | 索尼株式会社 | Vein authentication device and vein authentication method |
| CN102667675A (en) * | 2009-09-30 | 2012-09-12 | 夏普株式会社 | Optical pointing device and electronic equipment provided with the same, and light-guide and light-guiding method |
| CN102496014A (en) * | 2011-12-06 | 2012-06-13 | 长春方圆光电技术有限责任公司 | Optical fingerprint acquisition system for living body finger identification |
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Address after: 26 No. 523710 Guangdong province Dongguan city Tangxia town Pingshan Industrial Avenue 188 Patentee after: Central Intelligence Polytron Technologies Inc Address before: 26 No. 523710 Guangdong province Dongguan city Tangxia town Pingshan Industrial Avenue 188 Patentee before: Dongguan ZK Electronic Technology Co., Ltd. |
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Address after: No.32, Pingshan Industrial Road, Tangxia Town, Dongguan City, Guangdong Province, 523710 Patentee after: Entropy Technology Co., Ltd Address before: 523710 26 Pingshan 188 Industrial Avenue, Tangxia Town, Dongguan, Guangdong Patentee before: Entropy Technology Co., Ltd |
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