CN103268488A - Fingerprint acquisition device for wet finger - Google Patents
Fingerprint acquisition device for wet finger Download PDFInfo
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- CN103268488A CN103268488A CN2013101912081A CN201310191208A CN103268488A CN 103268488 A CN103268488 A CN 103268488A CN 2013101912081 A CN2013101912081 A CN 2013101912081A CN 201310191208 A CN201310191208 A CN 201310191208A CN 103268488 A CN103268488 A CN 103268488A
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Abstract
A fingerprint acquisition device for a wet finger comprises a shell body and an optical fingerprint imaging module arranged in the shell body. The optical fingerprint imaging module comprises a prism, an imaging objective lens, a fingerprint image acquisition unit and an LED light source, wherein the prism, the imaging objective lens, the fingerprint image acquisition unit and the LED light source are arranged according to a light path. The prism is made of glass with a refractive index of at least 1.7. A light patch between the prism and the imaging objective lens is provided with a first plane mirror and a second plane mirror, the intersection angle between the first plane mirror and the large end face of the prism is 97.1 degrees, light rays reflected by the first plane mirror enter the second plane mirror, the intersection angle between the second plane mirror and the large end face of the prism is 13 degrees, and light rays reflected by the second plane mirrors directly enter the imaging objective lens. The problem that the high-quality fingerprint image of the wet finger cannot be acquired due to the fact that the refractive index of water is lower than that of glass in an existing fingerprint acquisition device is solved, the fingerprint lines of an acquired fingerprint image of the wet finger can be clearly seen, the fingerprint acquisition device can be applied to register and comparison, and the size of the fingerprint acquisition device for the wet finger is obviously reduced.
Description
Technical field
The present invention relates to method or device that the applying electronic circuit carries out bio-identification, particularly relate to a kind of wet finger print harvester.
Background technology
Fingerprint identification technology has convenience, reliable, non-infringement and the lower characteristics of cost, and the user fingerprints data allocations to corresponding fingerprint verifying apparatus, can be uploaded fingerprint in real time and pressed record, generates fingerprint and presses form, for the accident of tracing provides foundation.The fingerprint quality of fingerprint recognition and collection is closely related, to by picker's finger corresponding requirement being arranged, especially be applied to gate inhibition or outdoor fingerprint acquisition device, to by picker's finger stricter requirement being arranged, for example finger can not be too wet, too dried or decortication is too serious.Yet, finger can be perspired or be 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 quality of the wet finger print image of existing fingerprint capturer collection, the fingerprint image poor quality that collects, can't see the fingerprint lines, can not register comparison.
Summary of the invention
Technical matters to be solved by this invention is the defective that remedies above-mentioned prior art, and a kind of wet finger print harvester is provided.
Technical matters of the present invention is solved by the following technical programs.
This wet finger print harvester, comprise housing and be arranged on the interior optical finger print image-forming module of described housing, described optical finger print image-forming module comprises complies with the prism that light path arranges, image-forming objective lens, be provided with colored complementary metal oxide semiconductor (CMOS) (Complementary Metal Oxide Semicon-ductor, initialism is CMOS) the fingerprint image acquisition unit of chip, and light emitting diode (Light Emitting Diode, 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 the image acquisition face, described small end face is that light source is injected face, and described downside is the image planes relative with image-forming objective lens.
The characteristics of this wet finger print harvester are:
Described prism is that refractive index is at least the prism that 1.7 glass is made, the refractive index that it is higher than the prism that general glass makes can effectively solve refractive index that existing fingerprint acquisition device is lower than glass because of the refractive index of water and cause gathering problem less than the wet finger print image of high-quality.
Light path between described prism and described image-forming objective lens is provided with first plane mirror and second plane mirror, the angle of the large end face of described first plane mirror and described prism is 97.1 °, the light of its reflection enters second plane mirror, the angle of the large end face of described second plane mirror and described prism is 13 °, and 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, be pressed against the part of the finger reflection ray on the large end face of described prism, downside by described prism injects on described first plane mirror, the light of the described first plane reflection mirror reflection enters second plane mirror, the light of the described second plane reflection mirror reflection directly enters described image-forming objective lens, and through the distortion that disappears of described image-forming objective lens, aberration, image in the light images on the light-sensitive surface of color cmos chip of described fingerprint image acquisition unit, and converts electric signal 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.
Technical matters of the present invention is solved by following further technical scheme.
Described first plane mirror is the rectangular-shaped thin plate mirror that has only a mirror surface.
Described second plane mirror is the rectangular-shaped thin plate mirror that has only a mirror surface.
Described image-forming objective lens is lens, and the angle of the primary optical axis of described image-forming objective lens and described prism large end face is 21 °.
Between the mainboard of the rear of described housing and described fingerprint image acquisition unit, be provided with the image-forming objective lens base, clamp fixing by the pilot hole on described housing and the described fingerprint image acquisition unit mainboard.
Described led light source is at least 1 visible or infrared light led light source, is installed in independently on the lamp plate, is positioned at the small end face below of described prism, parallel with small end face over against, can be used as lasting light source, the long-time use.
Technical matters of the present invention is solved by following further technical scheme again.
Described fingerprint image acquisition unit is colored complementary metal oxide semiconductor (CMOS) (Complementary Metal-Oxide-Semiconductor, initialism is CMOS) sensor, its motherboard circuit comprises the color cmos chip, main control chip, crystal oscillator, the storage unit chip, encryption chip, low pressure difference linear voltage regulator (Low Dropout Linear Regulator, initialism is LDO), reset circuit, and data communication interface, described color cmos chip respectively with the storage unit chip, LDO connects, described main control chip respectively with crystal oscillator, the storage unit chip, encryption chip, LDO, reset circuit and data communication interface connect, described LDO also respectively with the storage unit chip, data communication interface and described led light source connect.
Described color cmos chip is arranged on the image planes of described image-forming objective lens, and with the angle of the primary optical axis of image-forming objective lens be 77.8 °.
The light-sensitive surface of described color cmos chip is 5mm to the back focal length of described image-forming objective lens.
The light-sensitive surface of described color cmos chip will present the fingerprint image that the image in the light on it namely gathers and convert electric signal output to; described main control chip is used for finger collection; finger-image is proofreaied and correct; data communication and output control; described crystal oscillator is used for providing clock signal to main control chip; described storage unit chip is used for the memory function file; in order to finish registration and identification after the collection; described encryption chip is used for downloading own software algorithm and code; to being provided comprehensive by picker's significant data; the protection of high degree of safety; safeguard self rights and interests; avoid software piracy; described LDO is used for and will provides power supply to color cmos chip and main control chip after the power supply step-down from data communication interface; described reset circuit is used for providing reset signal to main control chip; described data communication interface is used for uniting use with computing machine; to finish the wet finger print collection of user; wet finger print comparison; abnormal alarm; the 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, the refractive index that it is higher than general glass efficiently solves refractive index that existing fingerprint acquisition device is lower than glass because of the refractive index of water and causes gathering problem less than the wet finger print image of high-quality; The wet finger print image of gathering can clearly be seen the fingerprint lines, can be used for registering comparison.In addition, adopt two plane mirrors to comply with light path and reasonably reflect, can improve space utilization efficient, obviously reduce the volume of wet finger print harvester, realize miniaturization, make its application more extensive.
Description of drawings
Fig. 1 is the index path of the specific embodiment of the invention;
Fig. 2 is that the motherboard circuit of the fingerprint image acquisition unit of the specific embodiment of the invention is formed block scheme.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing the present invention will be described.
A kind of as shown in the figure 1～2 shown in wet finger print harvester, comprise housing and be arranged on the interior optical finger print image-forming module of housing, the optical finger print image-forming module comprises complies with the prism 1 that light path arranges, image-forming objective lens 6, be provided with the fingerprint image acquisition unit 5 of color cmos chip, and led light source 4, prism 1 is that the model that the bright company limited in Chengdu produces is six Dove prisms of the making of environmental protection H-LAK7, glass refraction is 1.713, prism 1 includes large end face, small end face, downside and its excess-three side, large end face is the image acquisition face, small end face is that light source is injected face, and downside is the image planes relative with image-forming objective lens 6.Image-forming objective lens 6 is lens, and the angle of the primary optical axis of image-forming objective lens 6 and prism 1 large end face is 21 °.Prism 1 has the refractive index that is higher than the prism that general glass makes, and can effectively solve refractive index that existing fingerprint acquisition device is lower than glass because of the refractive index of water and cause gathering problem less than the wet finger print image of high-quality.
Light path between prism 1 and image-forming objective lens 6 is provided with first plane mirror 2 and second plane mirror 3, first plane mirror 2 is 97.1 ° with the angle of the large end face of prism 1, the light of its reflection enters second plane mirror 3, second plane mirror 3 is 13 ° with the large end face angle of prism 1, and the light of its reflection directly enters image-forming objective lens 6.First plane mirror 2 and second plane mirror 3 all are the rectangular-shaped thin plate mirrors that has only a mirror surface.
Between the mainboard of the rear of housing and fingerprint image acquisition unit 5, be provided with the image-forming objective lens base, clamp fixing by the pilot 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 installed in independently on the lamp plate, is positioned at the small end face below of prism 1, parallel with small end face over against, can be used as lasting light source, the long-time use.The light that led light source 4 sends enters prism 1 through the small end face of prism 1, be pressed against the part of the finger reflection ray on the large end face of prism 1, downside by prism 1 injects on first plane mirror 2, the light of first plane mirror, 2 reflections enters second plane mirror 3, the light of second plane mirror, 3 reflections directly enters image-forming objective lens 6, and through image-forming objective lens 6 disappear distortion, aberration, image in the light images on the light-sensitive surface of color cmos chip of fingerprint image acquisition unit 5, and converts electric signal 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, its motherboard circuit comprises the color cmos chip that 1/4 inch model of Ge Kewei (Galaxycore) electronics (Shanghai) Co., Ltd. product is GC0303, main control chip, crystal oscillator, the storage unit chip, encryption chip, low pressure difference linear voltage regulator LDO, reset circuit, and data communication interface, the color cmos chip respectively with the storage unit chip, LDO connects, main control chip respectively with crystal oscillator, the storage unit chip, encryption chip, LDO, reset circuit and data communication interface connect, LDO also respectively with the storage unit chip, data communication interface and described led light source connect.Laterally minimum is 684DPI to the DPI resolution of GC0303 color cmos chip, vertically minimum is 756DPI, and maximum trapezoidal distortion amount is 4.1%, is of a size of 43.1mm * 22mm * 22.4mm.
The color cmos chip is arranged on the image planes of image-forming objective lens, and with the angle of the primary optical axis of image-forming objective lens be 77.8 °.The light-sensitive surface of color cmos chip is 5mm to the back focal length of image-forming objective lens.
The light-sensitive surface of color cmos chip will present the fingerprint image that the image in the light on it namely gathers and convert electric signal output to; main control chip is used for finger collection; finger-image is proofreaied and correct; data communication and output control; crystal oscillator is used for providing clock signal to main control chip; the storage unit chip is used for the memory function file; in order to finish registration and identification after the collection; encryption chip is used for downloading own software algorithm and code; to being provided comprehensive by picker's significant data; the protection of high degree of safety; safeguard self rights and interests; avoid software piracy; LDO is used for and will provides power supply to color cmos chip and main control chip after the power supply step-down from data communication interface; reset circuit is used for providing reset signal to main control chip; data communication interface is used for uniting use with computing machine; to finish the wet finger print collection of user; wet finger print comparison; abnormal alarm; the control signal output function effectively improves wet finger print acquisition rate and accuracy of identification.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention does, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention; make some alternative or obvious modification that are equal to without departing from the inventive concept of the premise; and performance or purposes are identical, all should be considered as belonging to the scope of patent protection that the present invention is determined by claims of submitting to.
Claims (9)
1. wet finger print harvester, comprise housing and be arranged on the interior optical finger print image-forming module of described housing, described optical finger print image-forming module comprises complies with the prism that light path arranges, image-forming objective lens, be provided with the fingerprint image acquisition unit of colored complementary metal oxide semiconductor (CMOS) CMOS chip, and 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 the image acquisition face, described small end face is that light source is injected face, 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 first plane mirror and second plane mirror, the angle of the large end face of described first plane mirror and described prism is 97.1 °, the light of its reflection enters second plane mirror, the angle of the large end face of described second plane mirror and described prism is 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, be pressed against the part of the finger reflection ray on the large end face of described prism, downside by described prism injects on described first plane mirror, the light of the described first plane reflection mirror reflection enters second plane mirror, the light of the described second plane reflection mirror reflection directly enters described image-forming objective lens, and through the distortion that disappears of described image-forming objective lens, aberration, image in the light images on the light-sensitive surface of color cmos chip of described fingerprint image acquisition unit, and converts electric signal output to.
2. wet finger print harvester as claimed in claim 1 is characterized in that:
Described first plane mirror is the rectangular-shaped thin plate mirror that has only a mirror surface.
3. wet finger print harvester as claimed in claim 1 is characterized in that:
Described second plane mirror is the rectangular-shaped thin plate mirror that has only a mirror surface.
4. as claim 2 or 3 described wet finger print harvesters, it is characterized in that:
Described image-forming objective lens is lens, and the angle of the primary optical axis of described image-forming objective lens and described prism large end face is 21 °.
5. the described wet finger print harvester of claim 4 is characterized in that:
Between the mainboard of the rear of described housing and described fingerprint image acquisition unit, be provided with the image-forming objective lens base, clamp fixing by the pilot hole on described housing and the 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 installed in independently on the lamp plate, is positioned at the small end face below of described prism, parallel with small end face over against.
7. wet finger print harvester as claimed in claim 6 is characterized in that:
Described fingerprint image acquisition unit is the color cmos sensor; its motherboard circuit comprises the color cmos chip; main control chip; crystal oscillator; the storage unit chip; encryption chip; low pressure difference linear voltage regulator LDO; reset circuit; and data communication interface; described color cmos chip respectively with the storage unit chip; LDO connects; described main control chip respectively with crystal oscillator; the storage unit chip; encryption chip; LDO; reset circuit and data communication interface connect; described LDO also respectively with the storage unit chip; data communication interface and described led light source connect; the light-sensitive surface of described color cmos chip will present the fingerprint image that the image in the light on it namely gathers and convert electric signal output to; described main control chip is used for finger collection; finger-image is proofreaied and correct; data communication and output control; described crystal oscillator is used for providing clock signal to main control chip; described storage unit chip is used for the memory function file; in order to finish registration and identification after the collection; described encryption chip is used for downloading own software algorithm and code; to being provided comprehensive by picker's significant data; the protection of high degree of safety; safeguard self rights and interests; avoid software piracy; described LDO is used for and will provides power supply to color cmos chip and main control chip after the power supply step-down from data communication interface; described reset circuit is used for providing reset signal to main control chip; described data communication interface is used for uniting use with computing machine, to finish the wet finger print collection of user; wet finger print comparison; abnormal alarm; the control signal output function.
8. wet finger print harvester as claimed in claim 7 is characterized in that:
Described color cmos chip is arranged on the image planes of described image-forming objective lens, and with the angle of the primary optical axis of image-forming objective lens be 77.8 °.
9. wet finger print harvester as claimed in claim 8 is characterized in that:
The light-sensitive surface 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 true CN103268488A (en) | 2013-08-28 |
| CN103268488B CN103268488B (en) | 2016-05-18 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110945525A (en) * | 2019-10-31 | 2020-03-31 | 深圳市汇顶科技股份有限公司 | Method for fingerprint identification, fingerprint identification device and electronic equipment |
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2013
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110945525A (en) * | 2019-10-31 | 2020-03-31 | 深圳市汇顶科技股份有限公司 | Method for fingerprint identification, fingerprint identification device and electronic equipment |
| 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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| CN103268488B (en) | 2016-05-18 |
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