CN108345872A - Fingerprint recognition harvester and system - Google Patents
Fingerprint recognition harvester and system Download PDFInfo
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- CN108345872A CN108345872A CN201810239176.0A CN201810239176A CN108345872A CN 108345872 A CN108345872 A CN 108345872A CN 201810239176 A CN201810239176 A CN 201810239176A CN 108345872 A CN108345872 A CN 108345872A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/1347—Preprocessing; Feature extraction
- G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
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- Theoretical Computer Science (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention belongs to fingerprint identification technology fields, provide fingerprint recognition harvester and system, it is mutually perpendicular to intersect with more Y-axis conducting wires respectively by more X-axis conducting wires, and more X-axis conducting wires are with more Y-axis conducting wires for receiving inductive signal, then inductive signal is transferred to by central processing unit by flexible PCB, so that central processing unit obtains image information after carrying out signal processing to inductive signal.It is thus achieved that more X-axis conducting wires and more Y-axis conducting wire square crossings, the capacitance variation of each position can be obtained, detect the position of line ridge and line valley, to form fingerprint image data, and image information is obtained according to image data, so as to the effect of identification or the verification of system, fast response time, accuracy of identification are high and noise signal is small, therefore solve the problems, such as existing fingerprint identification technology there is response speeds that slow, accuracy of identification is low and noise signal is big.
Description
Technical field
The invention belongs to fingerprint identification technology fields, more particularly to fingerprint recognition harvester and system.
Background technology
In recent years, with the continuous development of the hand-hold electronic equipments such as mobile phone, palm PC and laptop and universal,
And people also increasingly pay attention to e-commerce security and personal information security.Meanwhile photoelectric technology and microcomputer skill
The fast development of art so that acquisition and processing to fingerprint image all become more feasible, and are auto Fingerprint Identification System
Development established solid foundation.
In today of development in Hi-Tech, fingerprint identification technology is ripe, because of everyone skin including fingerprint
Lines, it is different on pattern, breakpoint and crosspoint, it is unique and constant throughout one's life.Therefore known using fingerprint as identity
The the electronic equipment of other device also the next welcomed by the people, and the identifying systems such as traditional smart card, password are troublesome and simultaneously
Very unreliable, fingerprint identification technology identifies personal identity with the physiological characteristic of human body itself, this technology be at present compared with
For convenience of with safely identify system, it need not carry smart card or remember password, can be detected at any time.Using the most
It is widely the fields such as smart mobile phone, computer, is in addition to this used in criminal investigation, fingerprint entrance guard system, fingerprint attendance system, peace
Full secrecy system, identity authentication system etc. suffer to be widely applied very much.
The 1990s, fingerprint identification technology just rose at home, and application at that time is only limitted to criminal investigation field, it can be carried
High public security organ's case-solving rate, while saving many costs.The great market foreground of fingerprint identification technology, will be to international, domestic
Security protection industry generates tremendous influence.The Automated Fingerprint Identification System operating mode of auto Fingerprint Identification System can be divided into two classes：
Validation Mode and recognition mode.Validation Mode is also known as one-to-one comparison, and principle of contrast is：Fingerprint pre-registers sample data
Library simultaneously sets an identification code.When comparison, typing fingerprint simultaneously inputs identification code, and system, which is extracted according to identification code from database, to be referred to
Grain pattern sheet is compared with typing fingerprint.Recognition mode is also known as one-to-many comparison, and being will be in typing fingerprint and sample database
All fingerprints are compared one by one, are provided after finding the fingerprint to match or the complete sample database of search and are referred to without correspondence
The conclusion of line.In general, automated fingerprint identification algorithm system substantially by fingerprint enhancing, fingerprint classification, feature extraction and refers to
Line compares four parts and forms.For high-quality fingerprint image, fingerprint enhance technology it is not necessary to.It is tested for being operated in
Automated Fingerprint Identification System under card pattern need not also carry out fingerprint classification.Feature extraction and fingerprint comparison are then to refer to automatically
The indispensable component part of line identifying system and core.
Currently, in fingerprint collecting equipment, crucial fingerprint fingerprint recognition harvester part with science and technology into
It walks and continues to develop, can be divided mainly by its operation principle following several：
1, photo-electric fingerprint fingerprint recognition harvester, it is the full transmitting principle according to light, is pressed with when light is irradiated to
When the glass surface of fingerprint, since line ridge and line valley position are different to the reflected intensity of light, image quilt after refraction by prism
Semiconductor photoelectric device captures, and forms electric signal output by opto-electronic conversion.
2, semicoductor capacitor formula fingerprint fingerprint recognition harvester, it is to utilize large scale integrated circuit technology, nearly hundred
Ten thousand capacitive sensing cells arrays are integrated into the semiconductor die on piece of a fritter, when the finger of people is pressed in fingerprint recognition harvester
Insulating surface when, since the line ridge of fingerprint and line valley are different from the distance between capacitive sensing cells, be formed by distribution electricity
Appearance also differs, and after corresponding circuit carries out analog-to-digital conversion, becomes data image signal.
3, pressure sensitive fingerprint fingerprint recognition harvester, its top layer are by tens thousand of flexible pressure sensitive medium materials
Cell array composition, when finger presses on fingerprint recognition harvester surface, by all pressure sensitive medium material cells
Array is scanned, so that it may the convex-concave change transitions of the line ridge of fingerprint and line valley are gone out output at corresponding electric signal, to
Obtain the image of fingerprint.
4 ultrasonic scanning fingerprint fingerprint recognition harvesters, its principle are the surfaces using ultrasonic scanning fingerprint, are obtained
The reflection signal of line ridge and line valley different depth on print, and analyzed, obtain fingerprint image.
It is best with the effect of semicoductor capacitor formula fingerprint recognition harvester in any of the above technology, image consistency and several
What is distorted minimum, but is limited by production process of semiconductor and manufacturing cost, and sampling area is difficult to accomplish very greatly.
Therefore, that there is response speeds is slow, accuracy of identification is low and noise signal is big asks for existing fingerprint identification technology
Topic.
Invention content
The purpose of the present invention is to provide fingerprint recognition harvester and systems, it is intended to solve existing fingerprint identification technology
It there is a problem that response speed is slow, accuracy of identification is low and noise signal is big.
One aspect of the present invention provides a kind of fingerprint recognition harvester, and the fingerprint recognition harvester includes：
Bearing substrate, insulating layer and the protective layer being cascading；
Be located between the bearing substrate and the insulating layer, be arranged in parallel and spaced first pre-determined distance it is more
Root X-axis conducting wire；
It is located between the insulating layer and the protective layer, is arranged in parallel and more of spaced second pre-determined distance
Y-axis conducting wire；And
On the protective layer, for inductive signal to be transferred to central processing unit, so that the central processing unit pair
The inductive signal obtains the flexible PCB of image information after carrying out signal processing；
Wherein, the more X-axis conducting wires are mutually perpendicular to intersect with the more Y-axis conducting wires respectively, and the more X-axis
Conducting wire is with the more Y-axis conducting wires for receiving the inductive signal.
Another aspect of the present invention provides a kind of fingerprint recognition acquisition system, including central processing unit, the fingerprint recognition
Acquisition system further includes the fingerprint recognition harvester as described above being connected with the central processing unit.
In conclusion the present invention provides fingerprint recognition harvester and system, by being located in bearing substrate and insulation
Between layer, it is arranged in parallel and more X-axis conducting wires of spaced first pre-determined distance；Be located in insulating layer and protective layer it
Between, it is arranged in parallel and more Y-axis conducting wires of spaced second pre-determined distance；More X-axis conducting wires respectively with more Y-axis conducting wire phases
Mutual square crossing, and more X-axis conducting wires are used to receive inductive signal with more Y-axis conducting wires, it then will by flexible PCB
Inductive signal is transferred to central processing unit, so that central processing unit obtains image information after carrying out signal processing to inductive signal.
It is thus achieved that more X-axis conducting wires and more Y-axis conducting wire square crossings, can be obtained the capacitance variation of each position, detect
To the position of line ridge and line valley, to form fingerprint image data, and image information is obtained according to image data, so as to system
The effect of identification or verification, fast response time, accuracy of identification are high and noise signal is small, therefore solve existing fingerprint and know
Other technology has that response speed is slow, accuracy of identification is low and noise signal is big.
Description of the drawings
Fig. 1 is the structural schematic diagram of fingerprint recognition harvester provided by the invention.
Fig. 2 is the structural schematic diagram of parasitic capacitance detection mode in fingerprint recognition harvester provided by the invention.
Fig. 3 is the exemplary circuit figure of switching capacity in fingerprint recognition harvester provided by the invention.
Fig. 4 is the principle of induction schematic diagram of fingerprint in fingerprint recognition harvester provided by the invention.
Specific implementation mode
In order to make technical problems, technical solutions and advantageous effects to be solved by the present invention be more clearly understood, below in conjunction with
Accompanying drawings and embodiments, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only used
To explain the present invention, it is not intended to limit the present invention.
The fingerprint recognition harvester and system of the embodiment of the present invention, by being located between bearing substrate and insulating layer,
It is arranged in parallel and more X-axis conducting wires of spaced first pre-determined distance；And be located between insulating layer and protective layer, it is parallel to set
It sets and more Y-axis conducting wires of spaced second pre-determined distance；More X-axis conducting wires are mutually perpendicular to hand over more Y-axis conducting wires respectively
Fork, and more X-axis conducting wires are used to receive inductive signal with more Y-axis conducting wires, then pass through flexible PCB (Flexible
Printed Circuit, FPC) inductive signal is transferred to central processing unit, so that central processing unit carries out letter to inductive signal
Number processing after obtain image information.Image information obtained above is compared with pre-stored image information, you can is obtained
The whether matched conclusion of fingerprint, is extremely easy to the identification or verification of system.
In order to illustrate technical solutions according to the invention, illustrated below by specific embodiment.
Fig. 1 shows the structure of fingerprint recognition harvester provided by the invention, for convenience of description, illustrates only and this
The relevant part of inventive embodiments, details are as follows：
Above-mentioned fingerprint recognition harvester, including：
Bearing substrate 101, insulating layer 103 and the protective layer 105 being cascading；
It is located between bearing substrate 101 and insulating layer 103, is arranged in parallel and more of spaced first pre-determined distance
X-axis conducting wire 102；
It is located between insulating layer 103 and protective layer 105, is arranged in parallel and more Y of spaced second pre-determined distance
Spindle guide line 104；And
On protective layer 105, for inductive signal to be transferred to central processing unit, so that central processing unit believes induction
Number carry out signal processing after obtain the flexible PCB 106 of image information；
Wherein, more X-axis conducting wires 102 are mutually perpendicular to intersect with more Y-axis conducting wires 104 respectively, and more X-axis conducting wires
102 are used to receive inductive signal with more Y-axis conducting wires 104.
As an embodiment of the present invention, above-mentioned more X-axis conducting wires 102 are mutually perpendicular to hand over more Y-axis conducting wires 104 respectively
Fork so that the size reduction of product entirety.
As an embodiment of the present invention, above-mentioned central processing unit to inductive signal carry out processing include denoising, signal enhancing,
Binary conversion treatment and signal refinement.After carrying out signal processing to inductive signal, obtaining comparison, really, clearly image is believed
It ceases, the image information stored in the image information and system is compared, to judge whether the image collected signal is correct.
As an embodiment of the present invention, above-mentioned more X-axis conducting wires 102 with more Y-axis conducting wires 104 in predeterminated position by wearing
Hole connect, be all connected with flexible PCB 106 in predeterminated position X-axis conducting wire and Y-axis conducting wire, and flexible PCB 106 with
Central processing unit is connected, and ensures that the inductive signal received can be transferred to central processing unit.
As an embodiment of the present invention, above-mentioned first pre-determined distance is 10um, and above-mentioned second pre-determined distance is 10um.Due to
The line width of conducting wire is 10-40um, and X-axis conducting wire is mutually perpendicular to intersect with Y-axis conducting wire, and the line-spacing between two conducting wires is
10um, because the fingerprint width of people is 200um, so no matter how to operate, line ridge and line valley can when each finger presses
Across multiple conducting wires, inductive signal can be more fully received, so that collection result is more accurate.
As an embodiment of the present invention, the line resistance value of above-mentioned X-axis conducting wire is not more than 0.3 ohm, and the line of above-mentioned Y-axis conducting wire hinders
Value is not more than 0.3 ohm, decays so as to avoid signal excessive.
As an embodiment of the present invention, between above-mentioned X-axis conducting wire and the ranks of the Y-axis conducting wire there are coupled capacitor, on
Stating the infall of X-axis conducting wire and the Y-axis conducting wire, there is also coupled capacitors.
Fig. 2 shows the structures of parasitic capacitance detection mode in fingerprint recognition harvester provided by the invention, in order to just
In explanation, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
As an embodiment of the present invention, X-axis conducting wire and Y-axis conducting wire intersect, and there are coupled capacitor Cm between ranks, hand over
Pitching overlapping, there is also coupled capacitor Cm, and when not detecting signal, whole system is in charge balance state, parasitic capacitance Cp compared with
Small (can ignore), central processing unit are scanned detection to each conducting wire of X-axis and Y-axis, specially：Central processing unit is selected
The row of X-axis one are used as driving electrodes, then scan all Y-axis and detect capacitance as induction electrode, drive again after the completion next
Row are used as driving electrodes, then scan all Y-axis and detect capacitance as induction electrode, when have finger close to when, it is parasitic electric
Holding Cp can increase sharply, and coupled capacitor Cm can reduce, radio-frequency input signals and inductive output the signal hair that central processing unit is sent out
Variation has been given birth to, after carrying out pretreatment and feature extraction to variable quantity, in the streakline direction of fingerprint and has been hung down using Gabor wavelet model
Histogram uses Gaussian function [9] and the Gabor wavelet image enhancement mathematics of trigonometric function is built to image enhancement processing is carried out
Mould, two-dimensional mathematics expression formula are as follows：
H (x, y)=1/ (2 π λ σ ^2) " exp {-((" x " ^'/λ) ^2+ (y^') ^2)/(2 σ ^2) } exp (2 π ifx^') " ^,
And it using rotation expression formula x '=xcos θ+ysin θ, y '=- xcos θ+ysin θ of reference axis, can protect in this way
Angle can be repaired automatically when the difference of direction by demonstrate,proving each finger, reduce misclassification rate.
Fig. 3 shows the exemplary circuit of switching capacity in fingerprint recognition harvester provided by the invention, for the ease of saying
It is bright, illustrate only with the relevant part of the embodiment of the present invention, details are as follows：
As an embodiment of the present invention, by the principle of switching capacity equivalent resistance, using switching capacity equivalent resistance
Partial pressure is to determine the variation of capacitance by calculating the size of voltage value in circuit.The induced electricity when finger is close to induction electrode
Hold Cp to become larger, therefore output voltage Vout will become smaller.So sense will be extrapolated by the variation for detecting output voltage Vout
Answer the variation of capacitance Cp.As shown, the charge being stored in inductance capacitance Cp can be moved in preset capacitance Cs, at the same it is preset
The voltage of capacitance Cs can rise, and the amplitude of rising is then determined by inductance capacitance Cp and the capacity ratio of preset capacitance Cs, as long as at this time
The value of inductance capacitance Cp can be extrapolated by being calculated over the predeterminated voltage required time.The inductance capacitance Cp charging stages by
Directly it is connected with power supply in electrode, therefore impedance is relatively low, but since there are resistance for human body, makes induced electricity when human body touching electrode
Holding the impedance of Cp electrode sections can get higher, but due to the capacity of inductance capacitance Cp is bigger than preset capacitance Cs, and charge
Transfer moment just terminates, thus it is easy to be affected by noise, but a sequence of time is very short in circuit for electrode, therefore can incite somebody to action
The influence of noise inhibits to a very small extent.
Fig. 4 shows the principle of induction of fingerprint in fingerprint recognition harvester provided by the invention, for convenience of description, only
Show with the relevant part of the embodiment of the present invention, details are as follows：
As an embodiment of the present invention, since the line width of conducting wire is 10-40 μm, and X-axis conducting wire and Y-axis conducting wire mutually hang down
Straight to intersect, the line-spacing between two conducting wires is 10 μm, and the fingerprint width of people is 200 μm, so no matter how to operate, each finger
Line ridge 201 and line valley 202 can cross over multiple conducting wires when 20 pressing, and line ridge 201 arrives the distance d1 of sensor, and line valley 202 is arrived
Distance d2, d1 the ＜ d2 of sensor, according to the calculation formula of capacitance：
C=EsS/d,
Parasitic capacitance Cp1 in unit area at line ridge 201, parasitic capacitance Cp2, Cp1 the ＞ Cp2 at line valley 202,
In line ridge 201 to the region of 202 transition of line valley, the inductive signal that each wire is transmitted necessarily becomes according to the variation of lines
Change, central processing unit is scanned by the way of full point addressing, can accurately acquire the capacitance variation of each point, then will
These signals carry out binary conversion treatment analysis, so that it may to obtain clearly fingerprint image, the fingerprint obtained through the above way
Image is compared with pre-stored fingerprint image again, you can obtains verification conclusion.
The present invention also provides a kind of fingerprint recognition acquisition system, including central processing unit, the fingerprint recognition acquisition systems
It further include the fingerprint recognition harvester as described above being connected with the central processing unit.
Technical principle of the present invention according to current fingerprint recognition, using the production work of the projected capacitive of technology relative maturity
Skill, which produces convenient for the miniaturization of product, while can also make large-sized harvester, the scanning side of full point addressing
Formula is far superior to the integrated technology of thin film transistor (TFT) used by current semicoductor capacitor formula fingerprint sensor, and the structure
IC chip design is also relatively easy.
It is an advantage of the invention that it provides a kind of simple, easy to produce, with high accuracy fingerprint recognition harvester and system,
The device can be very good in the identification system applied to electronic product, and making step is as follows：
1, aluminum membranous layer is coated with by magnetron sputtering on the glass substrate cleaned up, it is 200- that coating chamber, which is driven beat,
350 seconds；Vacuum degree is 3.0 × 10-2Pa~5 × 10-2Pa, and the MO thicknesses of layers plated isAL thicknesses of layers
ForMO thicknesses of layers isEnsure 0.3 Ω of sheet resistance ＜/ of film layer；
2, to scratching POSI glue on the above-mentioned glass substrate completed the production, then pass through exposure, development, etching etc. again
Technique forms wire pattern, that is, the X-axis of driver circuit；
3, the product for having completed wire pattern by above-mentioned scratches OC glue, then by the techniques such as expose, develop, it is exhausted to make OC
Edge layer, which also has other than insulating effect prevents aluminum conductor from being contacted with air, plays the role of aoxidizing；
4, after cleaning up the product for completing above-mentioned operation, aluminum membranous layer, coating chamber transmission section are coated with by magnetron sputtering
Clap is 200-350 seconds；Vacuum degree is 3.0 × 10-2Pa~5 × 10-2Pa, and the MO thicknesses of layers plated isAL
Thicknesses of layers isMO thicknesses of layers isEnsure 0.3 Ω of sheet resistance ＜/ of film layer；
5, to scratching POSI glue on the above-mentioned glass substrate completed the production, then pass through exposure, development, etching etc. again
Technique forms wire pattern, that is, the Y-axis of driver circuit, the Y-axis conductor layer are mutually perpendicular to X-axis conducting wire；
6, the product for having completed wire pattern by above-mentioned scratches OC glue, then by the techniques such as expose, develop, makes OC and protect
Sheath, the film layer can prevent aluminum conductor from being contacted with air, play the role of aoxidizing, and help to improve product uses the longevity
Life；
7, the above-mentioned product for having completed wire pattern is subjected to work(after carrying out other back works after binding PFC
It can test, finally carry out packaging shipment.
The fingerprint recognition harvester and system of above-mentioned offer, using the harvester of fingerprint image as core component, work(
Can convert somatic fingerprint picture signal to the electric signal that central processing unit is capable of calculation process.First by glass from structure
Or film is as on substrate and by magnetron sputtering and the preferable metallic aluminium film layer of electric conductivity, due to the metal ductility of aluminium
Preferably, it is not easy to be influenced by external temperature environment；Yellow light technique in being produced by twisted-pair feeder, width is made by aluminum membranous layer
For 10 μm or so of lines, form it into the X-axis of fingerprint profile positioning, ensure that the line resistance of lines must not exceed 0.3 Ω, prevent because
It is excessive for resistance value, cause model to decay too fast problem, and prevent the excessive judgement for influencing central processing unit to signal of noise；
One layer of OC glue for playing insulating effect is made on the aluminum steel surface being ready for, and is stayed in predeterminated position by positional punch technology
Go out aperture, the yellow light work with by magnetron sputtering and the preferable metallic aluminium film layer of electric conductivity, then in being produced by twisted-pair feeder
Aluminum membranous layer is made the lines that width is 10 μm or so, forms it into the Y-axis of fingerprint profile positioning by skill, ensures the line resistance of lines
Must not exceed 0.3 Ω, the conducting wire of such X-axis and Y-axis is interlaced, but is mutually not attached to, and capacitive node is formed in cross-point locations,
Each wire is all connected by FPC with central processing unit and conducting wire can generate coupled capacitor by the coupling of adjacent electrode, is not had
When having finger pressing, it is in the state of capacitive balance, but when finger presses, this equilibrium state can be beaten
It is broken.For an adult, about 200 μm of the width between the line ridge and line ridge of fingerprint is known when making to press with finger fingerprint
When other harvester surface, line ridge and line ridge must can cover a plurality of conducting wire, between line ridge and line valley, form capacitance
A pole plate, fingerprint recognition harvester forms another pole plate of capacitance, the line ridge and line valley in finger line relative to
The inevitable difference of capacitance formed between smoother fingerprint recognition harvester.Line ridge and fingerprint recognition harvester
When plate contact, the capacitance that upright position is corresponded at line ridge is larger, the influence to the electric field balance of fingerprint recognition harvester
Larger, the capacitance that upright position is corresponded at line valley is smaller, and the influence to the electric field balance of fingerprint recognition harvester is smaller,
Line ridge and the line valley speed that vertically corresponding position is discharged are also different, and the central processing unit of fingerprint recognition harvester is to X-axis
With the Scanning Detction of each conducting wire of Y-axis, the capacitance for detecting each crosspoint and the capacitance change after touch are scanning
Upper to be carried out by the way of full point addressing, central processing unit is first used as driving electrodes to the row of X-axis one, then scans all Y-axis
Capacitance is detected as induction electrode, drives next column as driving electrodes again after the completion, then scans all Y-axis as sense
The problem of answering electrode detection capacitance, therefore accuracy higher, and not will produce drift.Because line ridge, line valley, can among line ridge
To cover multiple conducting wires, the inevitable difference of variable quantity of each wire passes through the Scanning Detction to multiple conducting wires, so that it may with
To the capacitance variation figure of each fixed position, you can to detect the position of line ridge and line valley, to form fingerprint image number
According to.By image is carried out denoising, enhancing, binaryzation, refinement and etc. after, obtain that comparison is true, clearly image information
Storage is used for the identification or verification of lower subsystem.
The fingerprint recognition harvester and system of the present invention has following advantage：
1, the present invention is the technology maturation based on the production technology of the capacitance touch screen of comparative maturity, production cost phase
To relatively low；
2, relative to semicoductor capacitor formula production technology, antistatic effect is stronger, and size can also be made to relatively large；
3, using OC puncturing techniques, conducting wire can be layered laid out in parallel, save space, and the size of product can be made
Smaller；
4, traditional designing technique may be used in IC chip, unlike IC chip is complicated in traditional fingerprint recognition system.
In conclusion an embodiment of the present invention provides fingerprint recognition harvester and systems, by being located in bearing substrate
Between insulating layer, it is arranged in parallel and more X-axis conducting wires of spaced first pre-determined distance；Be located in insulating layer with protection
Between layer, it is arranged in parallel and more Y-axis conducting wires of spaced second pre-determined distance；More X-axis conducting wires are led with more Y-axis respectively
Line is mutually perpendicular to intersect, and more X-axis conducting wires are used to receive inductive signal with more Y-axis conducting wires, then pass through flexible circuit
Inductive signal is transferred to central processing unit by plate, so that central processing unit obtains image letter after carrying out signal processing to inductive signal
Breath.It is thus achieved that more X-axis conducting wires and more Y-axis conducting wire square crossings, can be obtained the capacitance variation of each position, visit
The position for measuring line ridge and line valley to form fingerprint image data, and obtains image information, so as to system according to image data
Identification or verification effect, fast response time, accuracy of identification are high and noise signal is small, therefore solve existing fingerprint
Identification technology has that response speed is slow, accuracy of identification is low and noise signal is big.Realization of the embodiment of the present invention is simple,
Additional hardware need not be increased, can be effectively reduced cost, there is stronger usability and practicality.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
1. a kind of fingerprint recognition harvester, which is characterized in that the fingerprint recognition harvester includes：
Bearing substrate, insulating layer and the protective layer being cascading；
It is located between the bearing substrate and the insulating layer, is arranged in parallel and more X of spaced first pre-determined distance
Spindle guide line；
It is located between the insulating layer and the protective layer, is arranged in parallel and more Y-axis of spaced second pre-determined distance
Conducting wire；And
On the protective layer, for inductive signal to be transferred to central processing unit, so that the central processing unit is to described
Inductive signal obtains the flexible PCB of image information after carrying out signal processing；
Wherein, the more X-axis conducting wires are mutually perpendicular to intersect with the more Y-axis conducting wires respectively, and the more X-axis conducting wires
With the more Y-axis conducting wires for receiving the inductive signal.
2. fingerprint recognition harvester as described in claim 1, which is characterized in that the more X-axis conducting wires and the more Y
Spindle guide line is connected in predeterminated position by perforating.
3. fingerprint recognition harvester as described in claim 1, which is characterized in that first pre-determined distance is 10um.
4. fingerprint recognition harvester as described in claim 1, which is characterized in that second pre-determined distance is 10um.
5. fingerprint recognition harvester as described in claim 1, which is characterized in that the thickness range of the insulating layer is 1.6-
2.5um。
6. fingerprint recognition harvester as described in claim 1, which is characterized in that the line resistance value of the X-axis conducting wire is not more than
0.3 ohm.
7. fingerprint recognition harvester as described in claim 1, which is characterized in that the line resistance value of the Y-axis conducting wire is not more than
0.3 ohm.
8. fingerprint recognition harvester as described in claim 1, which is characterized in that the signal processing includes denoising, signal
Enhancing, binary conversion treatment and signal refinement.
9. fingerprint recognition harvester as described in claim 1, which is characterized in that the X-axis conducting wire and the Y-axis conducting wire
There are coupled capacitor between ranks, there is also coupled capacitors for the infall of the X-axis conducting wire and the Y-axis conducting wire.
10. a kind of fingerprint recognition acquisition system, including central processing unit, which is characterized in that the fingerprint recognition acquisition system is also
Include being connected with the central processing unit such as claim 1-9 any one of them fingerprint recognition harvesters.
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| CN201810239176.0A CN108345872A (en) | 2018-03-22 | 2018-03-22 | Fingerprint recognition harvester and system |
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| CN201810239176.0A CN108345872A (en) | 2018-03-22 | 2018-03-22 | Fingerprint recognition harvester and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110908006A (en) * | 2018-09-14 | 2020-03-24 | 欧姆龙株式会社 | Object detection sensor and object detection system |
| CN111242052A (en) * | 2020-01-16 | 2020-06-05 | 成都唐源电气股份有限公司 | Method and device for automatically distinguishing rigid and flexible wires of contact network |
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| Publication number | Priority date | Publication date | Assignee | Title |
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