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WO2018151547A1 - Appareil de reconnaissance d'informations biométriques et procédé de reconnaissance d'informations biométriques utilisant ledit appareil - Google Patents

Appareil de reconnaissance d'informations biométriques et procédé de reconnaissance d'informations biométriques utilisant ledit appareil Download PDF

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Publication number
WO2018151547A1
WO2018151547A1 PCT/KR2018/001965 KR2018001965W WO2018151547A1 WO 2018151547 A1 WO2018151547 A1 WO 2018151547A1 KR 2018001965 W KR2018001965 W KR 2018001965W WO 2018151547 A1 WO2018151547 A1 WO 2018151547A1
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Prior art keywords
image
piezoelectric sensor
signal
biometric information
frequency
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PCT/KR2018/001965
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English (en)
Korean (ko)
Inventor
방창혁
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BEFS Co Ltd
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BEFS Co Ltd
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N30/00—Piezoelectric or electrostrictive devices
    • H10N30/20—Piezoelectric or electrostrictive devices with electrical input and mechanical output, e.g. functioning as actuators or vibrators

Definitions

  • the present invention relates to a biometric information recognition device and a biometric information recognition method using the same, and more particularly, a biometric information recognition device capable of recognizing not only the epidermis of a fingerprint but also dermis and finger vein information using multiple frequencies, and a biometric using the same It relates to an information recognition method.
  • the user's finger fingerprint is one of the authentication media that can meet the above demand, many operators and developers continue to develop devices and methods that can be authenticated using the user's fingerprint.
  • the conventional ultrasonic fingerprint recognition device has a problem that it is difficult to recognize a variety of biometric information such as finger vein or bone.
  • An object of the present invention is to provide an apparatus and method for recognizing a biometric information capable of applying a plurality of different frequencies to a piezoelectric sensor.
  • an object of the present invention is to provide a biometric information recognition apparatus and method capable of simultaneously recognizing not only the fingerprint but also the blood vessel information inside the finger.
  • Biometric information recognition apparatus comprises a piezoelectric sensor array including a plurality of piezoelectric sensors arranged in an array in a two-dimensional plane and having a predetermined height; And a controller configured to apply a plurality of different frequency signals to the piezoelectric sensor and to receive a plurality of ultrasonic signals reflected from the piezoelectric sensor to obtain a surface image of an object in contact with or in proximity to the piezoelectric sensor and an internal image of the object. It may include.
  • the controller may control the plurality of frequencies to be alternately input to a column or a row of the piezoelectric sensor array.
  • the control unit includes a signal generator for generating a plurality of frequency signals applied to the piezoelectric sensor; A signal detector configured to detect a signal generated by the plurality of frequency signals and reflected by the piezoelectric sensor; And an image generator for analyzing the reflected signal to generate a fingerprint image and an image inside the living body.
  • the controller may generate and apply a first frequency signal having a low transmittance and a second frequency signal having a high transmittance.
  • the plurality of frequency signals may be applied to the piezoelectric sensor in different directions.
  • the surface image of the object may be a fingerprint image
  • the internal image of the object may include at least one or more of a dermal image, a blood vessel image, and a bone image.
  • the plurality of frequency signals may be an integer multiple of the resonance frequency of the piezoelectric sensor.
  • the biometric information recognition method is a biometric information recognition method for recognizing the biometric information by applying a predetermined frequency signal to the piezoelectric sensor array consisting of a plurality of piezoelectric sensors, different from the piezoelectric sensor array Applying a plurality of frequency signals; Sensing a plurality of ultrasonic signals reflected from the piezoelectric sensor; And analyzing each of the plurality of frequency signals to generate a surface image and an in vivo image of the object.
  • the plurality of frequency signals may be alternately input to a column or a row of the piezoelectric sensor array.
  • the plurality of frequency signals may be applied to the piezoelectric sensor in different directions.
  • the plurality of frequency signals may include a first frequency signal having a low transmittance and a second frequency signal having a high transmittance.
  • the surface image of the object is a fingerprint image
  • the internal image of the object may include at least one or more of the dermal image, blood vessel image, and bone image.
  • the fingerprint image not only the fingerprint image but also other biometric information inside the finger can be recognized simultaneously.
  • an epidermal fingerprint and a dermal fingerprint may be obtained to generate a 3D fingerprint image.
  • security can be enhanced by using not only the fingerprint but also other biometric information.
  • forgery fingerprint can be prevented by recognizing not only the fingerprint image but also biometric information such as blood vessels or bones such as the finger vein.
  • FIG. 1 conceptually illustrates a biometric information recognition apparatus according to an embodiment of the present invention.
  • FIG. 2 is a block diagram schematically illustrating an apparatus for recognizing biometric information according to an exemplary embodiment of the present invention.
  • FIG. 3 illustrates a piezoelectric sensor array of a biometric information recognition apparatus according to an embodiment of the present invention.
  • FIG. 4 shows an example of generating biometric information according to an embodiment of the present invention.
  • FIG. 5 illustrates a biometric information recognition method according to an embodiment of the present invention.
  • any configuration sensors merely refers to the presence of the configuration sensors as an open expression, and should not be understood as excluding additional configuration sensors.
  • a component sensor when referred to as being connected or connected to another component sensor, it should be understood that there may be another component sensor in between, although it may be directly connected or connected to the other component sensor.
  • an expression such as 'first' and 'second' is used only for distinguishing a plurality of components, and does not limit the order or other features between the components.
  • FIG. 1 schematically shows a biometric information recognition apparatus 100 according to an embodiment of the present invention.
  • the biometric information recognition apparatus 100 includes a plurality of piezoelectric sensors 110, a controller 120 electrically connected to the plurality of piezoelectric sensors to detect a fingerprint, and a filler 112 provided between the plurality of piezoelectric sensors. ) May be included.
  • the plurality of piezoelectric sensors 110 may form an m ⁇ n array on a two-dimensional plane together with the filler 112.
  • the piezoelectric sensor 110 may be configured of any one of an ultrasonic piezoelectric ceramic sensor, an ultrasonic piezoelectric film sensor, a CMUT sensor, and a PMUT sensor.
  • the ultrasonic piezoelectric ceramic sensor is a method using a polycrystalline piezoelectric ceramic capable of generating ultrasonic waves
  • the ultrasonic piezoelectric film sensor is a method of forming or coating a film in the film form
  • the CMUT sensor is a method using a semiconductor manufacturing method Capacitive Micromachined Ultrasonic Transducers (CMUTs) are used
  • the PMUT sensor is a method using a MEMS process, using a Piezoelectric Micromachined Ultrasonic Transducers (PMUT).
  • Each sensor configured in the form of an array may be arranged at regular intervals to independently transmit and receive signals, and may be configured so that interference between the sensor and the sensor may not occur chemically, physically, or electrically.
  • the filler 112 may be composed of a polymer or an epoxy.
  • the controller 120 is connected to each of the plurality of piezoelectric sensors 110, and in particular, is connected to an electrode provided up and down in the height direction of each piezoelectric sensor 110.
  • the piezoelectric sensor 110 may be 1-3 piezo composites, and may be manufactured by disposing electrodes on upper and lower surfaces of pillars extending in a height direction.
  • the pillar portion may include at least one material of PZT, PST, Quartz, (Pb, Sm) TiO3, PMN (Pb (MgNb) O3) -PT (PbTiO3), PVDF, or PVDF-TrFe.
  • the controller 120 may generate an ultrasonic signal by applying a voltage having a resonant frequency of the ultrasonic band to electrodes provided on the upper and lower surfaces of the pillar part to vibrate the pillar part up and down.
  • the upper and lower surfaces of each of the plurality of piezoelectric sensors 110 may be a square or a circle having one side or a diameter of 40 to 50 ⁇ m. In addition, it can be implemented in various shapes such as triangle, pentagon, hexagon.
  • the filler 112 provided between the plurality of piezoelectric sensors 110 may block the vibrations of the plurality of piezoelectric sensors 110 from affecting each other.
  • An array structure including the piezoelectric sensor 110 is manufactured by densely arranging a plurality of piezoelectric sensors 110 having a columnar shape and forming a filler 112 therebetween. Accordingly, as the number of piezoelectric sensors 110 is disposed in the same area, problems such as a decrease in yield may occur due to an increase in difficulty of the manufacturing process.
  • the fingerprint can be accurately detected by measuring the difference in acoustic impedance generated from the valley and the ridge of the fingerprint by the ultrasonic signal generated by each piezoelectric sensor 110, in order to accurately detect the fingerprint It is necessary to place as many piezoelectric sensors 110 as possible in the same area.
  • FIG. 2 is a block diagram schematically showing the biometric information recognition apparatus 100 according to an embodiment of the present invention.
  • the biometric information recognition apparatus 100 includes a piezoelectric sensor array 210 including a plurality of piezoelectric sensors 110 and a polymer filler 112, and a controller 220.
  • the controller 220 may include a signal generator 222, a signal detector 224, an image generator 226, and the like.
  • the piezoelectric sensor array 210 includes a plurality of piezoelectric sensors 110 densely arranged in a matrix form as shown in FIG. 1, and a filler 112 disposed therebetween to insulate the vibration between the piezoelectric sensors 110. ) May be included.
  • Each of the piezoelectric sensors 110 may include a pillar formed of a material that is easy to vibrate, and an electrode provided of a conductive material on upper and lower surfaces of the pillar.
  • the pillar portion may be formed of a material such as PZT, and the electrode may be formed of a metal having excellent conductivity (Cu, Ag, Ni, Mo, or an alloy thereof).
  • the signal generator 222 is electrically connected to an electrode of the piezoelectric sensor 110 included in the piezoelectric sensor array 210, and applies an AC voltage having a predetermined frequency to each electrode. As the pillar portion of the piezoelectric sensor 110 vibrates up and down by an alternating voltage applied to the electrode, an ultrasonic signal having an integer multiple of a predetermined resonance frequency is emitted to the outside.
  • a predetermined protective layer may be further provided on the piezoelectric sensor array 210, and a specific object may contact one surface of the protective layer.
  • the object in contact with one surface of the protective layer is a finger of a person including a fingerprint
  • the reflection pattern of the ultrasonic signal emitted by the piezoelectric sensor 110 is different depending on minute valleys and ridges present in the fingerprint. Is determined.
  • the signal detector 224 may obtain a fingerprint image by measuring a difference in acoustic impedance generated by an ultrasonic signal at a valley and a ridge of the fingerprint from each piezoelectric sensor 110.
  • the signal generator generates a plurality of different frequencies. It is possible to generate two or more different frequencies.
  • the apparatus may include a first signal generator for generating a first frequency signal and a second signal generator for generating a second frequency signal.
  • a signal is applied from the signal generator to the piezoelectric sensor, ultrasonic waves are generated while the piezoelectric element vibrates, and the generated ultrasonic waves generate ultrasonic waves having different frequencies according to the frequency of the applied signal.
  • Ultrasonic signals have different reflectances and transmittances according to frequency, so when only one frequency signal is applied, a clear image cannot be obtained for both the fingerprint of the epidermis and the body signals such as blood vessels and bones. If the ultrasound signal has a high reflectance and a low transmittance, the finger epidermal fingerprint signal may be clearly obtained, but the biosignal (blood vessel, bone) inside the finger may not be obtained clearly. On the contrary, when the reflectance is low and the transmittance is low, the biosignal inside the finger can be obtained clearly, but the epidermal fingerprint cannot be obtained clearly.
  • an image of the epidermal part and a biosignal (dermis, blood vessel, bone, etc.) inside the finger can be obtained at the same time.
  • a thickness of 1.7 millimeters 30 MHz provides nearly 100% transmittance and 10 MHz provides approximately 65% transmittance. Therefore, if the first signal generator oscillates at a frequency of 5 MHz, and the second signal generator oscillates at a frequency of 30 MHz, not only an image of the epidermal fingerprint but also an image of a blood vessel in the skin can be obtained.
  • the epidermal image and the dermis or the finger vein image can be obtained at the same time by applying the first signal to the odd column and the second signal to the even column of the sensor array.
  • the resonant frequency of the piezoelectric sensor is 5 MHz
  • the first signal generator applies a frequency of 10 MHz to the odd column
  • the second signal generator applies a frequency of 20 MHz to the even column
  • the ultrasonic waves generated in the odd column are the epidermis.
  • the fingerprint image of the part may be clearly obtained, and the ultrasound generated in the even rows may acquire the dermal fingerprint or the finger vein image clearly.
  • the image generator 226 analyzes a signal detected by the signal detector 224 to calculate a fingerprint pattern, and generates an image accordingly.
  • the piezoelectric sensor 110 generated with low intensity of the reflected signal is the piezoelectric sensor 110 abutting the ridge of the fingerprint, and the generated ultrasonic signal has high intensity-ideally output ultrasonic signal
  • the piezoelectric sensor 110 which is generated approximately equal to the strength of the piezoelectric sensor 110, corresponds to the valley of the fingerprint. Therefore, a fingerprint image may be generated by calculating a difference in acoustic impedance detected by each piezoelectric sensor 110.
  • the image generator 226 may generate an image of blood vessel or bone shape by analyzing signals reflected from blood vessels or bones inside the finger as well as the fingerprint.
  • FIG. 3 briefly illustrates the piezoelectric sensor array 310 and the electrode arrangement.
  • a plurality of piezoelectric sensors 110 are arranged in a matrix form in the piezoelectric sensor array 310, and each of the piezoelectric sensors 110 is connected to an upper electrode 310 and a lower electrode 320.
  • Any one of the upper electrode 310 and the lower electrode 320 may be used as the transmission electrode Tx.
  • the upper electrode 310 is a transmission electrode.
  • the upper electrode 310 and the lower electrode 320 may be disposed to cross each other at right angles.
  • the signal input directions of the electrodes 310 and 320 may be alternately input in opposite directions.
  • an electrode may be connected to an odd column of the piezoelectric sensor array in an upward direction, and an electrode may be connected to an even column in a downward direction.
  • an electrode may be connected to an odd row of the piezoelectric sensor array in a left direction, and an electrode may be connected to an even row in a right direction.
  • the upper electrode 310 includes the first upper electrode 312 and the second upper electrode 314, and the lower electrode 320 includes the first lower electrode 322 and the second lower electrode 324.
  • the upper electrode 310 includes the first upper electrode 312 and the second upper electrode 314, and the lower electrode 320 includes the first lower electrode 322 and the second lower electrode 324.
  • a first frequency signal may be applied to the first upper electrode 312, and a second frequency signal may be applied to the second upper electrode 314.
  • the first frequency signal may be a signal for recognizing the epidermal fingerprint
  • the second frequency signal may be a signal for recognizing a biosignal inside the finger.
  • the first frequency signal may be 10 MHz, and the second frequency signal may be 15 MHz or 20 MHz.
  • the frequency may vary depending on the resonance frequency of the piezoelectric sensor, and may be variously set within a range that is an integer multiple of the resonance frequency.
  • an example in which different frequencies are alternately input to odd and even columns of the sensor array may be input based on rows. That is, the first frequency may be input to odd rows of the sensor array, and the second frequency may be input to even rows.
  • FIG. 4 illustrates an example of simultaneously acquiring a fingerprint and a blood vessel image according to an embodiment of the present invention.
  • a cover substrate 450 is disposed on the piezoelectric sensor array 410, and a finger is positioned on the cover substrate 450.
  • the cover substrate 450 is formed above the plurality of piezoelectric elements, which means a substrate to which a user's finger directly touches.
  • the cover substrate may be embodied as a glass substrate, and may further include reinforced or soft plastics such as polyimide, polyethylene terephthalate, propylene glycol, polycarbonate, and sapphire.
  • the piezoelectric sensor of the portion where the finger is positioned is activated to generate an ultrasonic signal.
  • the odd-numbered piezoelectric sensors may generate ultrasonic waves of the first frequency
  • the even-numbered piezoelectric sensors may generate ultrasonic waves of the second frequency.
  • the first frequency may be 10 MHz and the second frequency may be 20 MHz. Therefore, an odd number of piezoelectric sensors may generate a fingerprint image of the finger epidermis, and an even number of piezoelectric sensors may generate a blood vessel image inside the finger.
  • the fingerprint image can be generated in three dimensions by generating not only the epidermal fingerprint but also the dermal fingerprint image.
  • the present invention by simultaneously applying different frequencies to the piezoelectric sensor to generate ultrasonic waves having different transmittances, it is possible to simultaneously measure not only the image of the epidermal part of the finger but also the bioinformation inside the finger.
  • FIG. 5 illustrates a biometric information recognition method according to an embodiment of the present invention.
  • a plurality of different frequency signals are applied to a piezoelectric sensor array including a plurality of piezoelectric sensors (S510). And sensing (S520), and analyzing each of the plurality of frequency signals to generate a surface image and an in vivo image of the object (S530).
  • the plurality of different ultrasonic signals may be two or more, and as described above, the ultrasonic signals may include a first frequency signal having a low transmittance and a second frequency signal having a high transmittance.
  • the piezoelectric sensor When the frequency signal is applied to the piezoelectric sensor, the piezoelectric sensor generates an ultrasonic signal, the ultrasonic signal is reflected on the object located above the piezoelectric sensor.
  • the ultrasonic signal generated by the first frequency signal has a low transmittance and is mainly reflected from the surface of the object
  • the ultrasonic signal generated by the second frequency signal has a high transmittance and penetrates to the inside of the object and then may return. have.
  • the first frequency signal may be input to an odd column of the piezoelectric sensor array, and the second frequency signal may be input to an even column of the piezoelectric sensor array.
  • the surface image of the object may be generated by analyzing the ultrasonic signals reflected from the odd rows of the piezoelectric sensor array, and the internal image of the object may be generated by analyzing the ultrasonic signals reflected from the even columns of the piezoelectric sensor array.
  • the surface image of the object may include an epidermal fingerprint image of a finger
  • the internal image of the object may include a dermal fingerprint image, a blood vessel image, and a bone image of a finger.
  • a three-dimensional fingerprint image can be generated by synthesizing the epidermal fingerprint image and the dermal fingerprint image.

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Abstract

La présente invention concerne un appareil de reconnaissance d'informations biométriques. L'appareil de reconnaissance d'informations biométriques selon la présente invention peut comprendre : un réseau de capteurs piézoélectriques comprenant une pluralité de capteurs piézoélectriques qui sont agencés en un réseau dans un plan bidimensionnel et dont chacun a une hauteur prédéterminée ; et une unité de commande pour appliquer une pluralité de signaux de fréquence différents aux capteurs piézoélectriques et recevoir une pluralité de signaux ultrasonores réfléchis par les capteurs piézoélectriques, de façon à acquérir une image de surface d'un objet qui touche les capteurs piézoélectriques ou s'en approche et une image interne de l'objet.
PCT/KR2018/001965 2017-02-16 2018-02-14 Appareil de reconnaissance d'informations biométriques et procédé de reconnaissance d'informations biométriques utilisant ledit appareil Ceased WO2018151547A1 (fr)

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KR20170021089 2017-02-16

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110112284A (zh) * 2019-05-27 2019-08-09 京东方科技集团股份有限公司 柔性声电基板及其制备方法、柔性声电装置
WO2020263477A1 (fr) * 2019-06-26 2020-12-30 Qualcomm Incorporated Système de capteur ultrasonore à double fréquence comportant un diviseur de fréquence
WO2021046688A1 (fr) * 2019-09-09 2021-03-18 北京微动数联科技有限公司 Procédé et appareil de reconnaissance de partie du corps, coussin intelligent, dispositif et support
US20220205821A1 (en) * 2020-12-30 2022-06-30 Itron Golbal SARL Unified system for pressure and flowrate measurement
EP4338854A2 (fr) 2023-12-20 2024-03-20 Sicpa Holding SA Procédés de production de couches à effets optiques

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110112284A (zh) * 2019-05-27 2019-08-09 京东方科技集团股份有限公司 柔性声电基板及其制备方法、柔性声电装置
WO2020263477A1 (fr) * 2019-06-26 2020-12-30 Qualcomm Incorporated Système de capteur ultrasonore à double fréquence comportant un diviseur de fréquence
US11580204B2 (en) 2019-06-26 2023-02-14 Qualcomm Incorporated Dual-frequency ultrasonic sensor system with frequency splitter
TWI843854B (zh) * 2019-06-26 2024-06-01 美商高通公司 包含具有分頻層之雙頻超音波感測器系統之設備及其控制方法
WO2021046688A1 (fr) * 2019-09-09 2021-03-18 北京微动数联科技有限公司 Procédé et appareil de reconnaissance de partie du corps, coussin intelligent, dispositif et support
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US20220205821A1 (en) * 2020-12-30 2022-06-30 Itron Golbal SARL Unified system for pressure and flowrate measurement
EP4338854A2 (fr) 2023-12-20 2024-03-20 Sicpa Holding SA Procédés de production de couches à effets optiques
WO2025131613A1 (fr) 2023-12-20 2025-06-26 Sicpa Holding Sa Procédés de production de couches à effets optiques

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