US20080175450A1 - Biometric piezo scanner - Google Patents

Biometric piezo scanner Download PDF

Info

Publication number
US20080175450A1
US20080175450A1 US11819270 US81927007A US2008175450A1 US 20080175450 A1 US20080175450 A1 US 20080175450A1 US 11819270 US11819270 US 11819270 US 81927007 A US81927007 A US 81927007A US 2008175450 A1 US2008175450 A1 US 2008175450A1
Authority
US
Grant status
Application
Patent type
Prior art keywords
detected
pixel
fingerprint
sensor array
example
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US11819270
Inventor
Walter G. Scott
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sonavation Inc
Original Assignee
Cross Match Technologies Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

Links

Images

Classifications

    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K9/00Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
    • G06K9/00006Acquiring or recognising fingerprints or palmprints
    • G06K9/00013Image acquisition
    • G06K9/00053Protecting the fingerprint sensor against damage caused by the finger
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K9/00Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
    • G06K9/00006Acquiring or recognising fingerprints or palmprints
    • G06K9/00013Image acquisition
    • G06K9/0002Image acquisition by non-optical methods, e.g. by ultrasonic or capacitive sensing
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K9/00Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
    • G06K9/00885Biometric patterns not provided for under G06K9/00006, G06K9/00154, G06K9/00335, G06K9/00362, G06K9/00597; Biometric specific functions not specific to the kind of biometric
    • G06K9/00899Spoof detection
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61BDIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B8/00Diagnosis using ultrasonic, sonic or infrasonic waves
    • A61B8/06Measuring blood flow

Abstract

A piezoelectric thin film sensor array is used to scan and capture biometric data, for example, a fingerprint image. In one embodiment, a multi-layer structure includes a PVDF layer in between two conductor grids arranged orthogonally to one another. Urethane can be added to one side where a finger is placed. A foam substrate can be used as a support. In one feature, the PVDF, and grids can be peeled off like a label for easy replacement. Multiplexers are switched to scan the sensor. A single pixel or a group of pixels can be detected and output to an image memory. The presence of a fingerprint ridge is detected by virtue of a ring-down oscillation that arises from reflection when an electric field is applied to the piezoelectric thin film sensor array at a pixel in contact with the fingerprint ridge. For example, such a ring-down value associated with a fingerprint ridge can be detected at about 150 ns. (or 5 cycles at 30 MHZ). Other reflections indicative of additional biometrics (e.g. from tissue, blood, bone, fingernail, etc.) can also be detected. A Doppler effect due to reflections from circulating blood can also be detected. Such a Doppler effect can provide further information about direction and speed of blood circulation. An instantaneous pyroelectric effect can also be detected to indicate a live finger presence.

Description

  • This application claims the benefit of the filing date of U.S. Provisional Application Ser. No. 60/147,497, filed 9 Aug. 1999, which is hereby incorporated by reference in its entirety.
  • BACKGROUND OF THE INVENTION
  • 1. Field of the Invention
  • The present invention relates generally to fingerprint scanning and imaging. More specifically, this invention relates to a piezoelectric film used within a fingerprint scanner.
  • 2. Related Art
  • Biometrics are a group of technologies that provide a high level of security. Fingerprint capture and recognition is an important biometric technology. Law enforcement, banking, voting, and other industries increasingly rely upon fingerprints as a biometric to recognize or verify identity. See, Biometrics Explained, v. 2.0, G. Roethenbaugh, International Computer Society Assn. Carlisle, Pa. 1998, pages 1-34 (incorporated herein by reference in its entirety). A number of companies are currently active in biometric finger technologies. See, a listing of companies published by Biometric Technology Today (Btt™), two pages, 1999 (http://www.sjbresearch.com).
  • Optical fingerprint scanners are available that detect a reflected optical image of a fingerprint. To capture a quality image at a sufficiently high resolution, optical fingerprint scanners require at minimum optical components (e.g., lenses), an illumination source, and an imaging camera. Such components add to the overall cost of a fingerprint scanner. Mechanical structures to maintain alignment also increase manufacturing and maintenance costs.
  • Solid-state silicon-based transducers are also available in commercial fingerprint scanners sold by Seimens, Lucent, and Harris Semiconductor. Such silicon transducers measure capacitance. This requires the silicon transducers to be thin, reducing their durability. To detect a rolled fingerprint, the sensing array of the solid-state transducer needs to have an area of sufficient size, for example one-inch by one-inch with a thickness of about 50 microns. A silicon array with such a large size increases the base cost of a fingerprint scanner and leads to greater maintenance costs. Durability and structural integrity are also more likely to suffer in such a large silicon geometry.
  • What is needed is an inexpensive, durable fingerprint scanner with low maintenance costs.
  • SUMMARY OF THE INVENTION
  • The present invention provides a piezoelectric film biometric sensing device. A piezoelectric film sensor array is used to detect biometric data, for example, a fingerprint image. In one embodiment the piezo film sensor array is a multi-layer structure that includes a piezo layer sandwiched by two conductor grids. The conductor grids are oriented orthogonally to one another. A shield layer can be added to one side where a finger is placed to provide a protective coating. A foam substrate can be used as a support.
  • In one example, the piezo layer comprises a polarized fluoropolymer film, such as polyvinylidene fluoride (PVDF) film or its copolymers. Conductor grids are silver ink electrodes printed on opposite sides of the PVDF film. A shield layer is made of urethane or other plastic. A foam substrate is made of Teflon™. An adhesive holds the shield layer and foam substrate on opposite sides of the printed PVDF film.
  • In one feature, the PVDF film, including the printed electrodes, can be peeled off like a label for easy replacement.
  • According to one embodiment, a fingerprint scanner uses a piezo film sensor array to scan and capture an image of a fingerprint. The fingerprint scanner further includes an oscillator, gate counter, pulser, two multiplexers, controller, detector, filter and image memory. An input pulse of one cycle of the oscillator frequency (e.g., 30 MHZ) is applied by the pulser through a multiplexer to a single pixel or group of pixels in the piezo sensor array. A reflection from a ridge can be detected within a number of cycles after the input pulse is applied by the pulser. The presence of a fingerprint ridge is detected by virtue of a ring-down oscillation. The ring-down oscillation arises from reflections that occur when an electric field is applied to the piezoelectric thin film sensor array at a pixel in contact with the fingerprint ridge. A single pixel or a group of pixels is then detected and output to an image memory. The controller switches the multiplexers to scan the piezo film sensor array in coordination with the cycles of pulses output from the pulser and the detected pixel readings made by the detector.
  • Other reflections indicative of additional biometrics related to the finger (e.g. from tissue, blood, bone, fingernail, etc.) can also be detected. A Doppler effect due to reflections from circulating blood can also be detected. Such a Doppler effect can provide further information about direction and speed of blood circulation.
  • According to another embodiment, an instantaneous pyroelectric effect can also be detected by the piezoelectric film sensor array to indicate a live finger presence. A signal indicative of the live finger detection can then be used to automatically initiate or “awaken” the fingerprint scanner to scan and capture an image of the fingerprint using the same piezoelectric scanner array.
  • Further features and advantages of the present invention, as well as the structure and operation of various embodiments of the present invention, are described in detail below with reference to the accompanying drawings.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • The accompanying drawings, which are incorporated herein and form part of the specification, illustrate the present invention and, together with the description, further serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the invention.
  • FIG. 1A is a cross-sectional view of a piezoelectric film sensor array according to one embodiment of the present invention;
  • FIG. 1B is an overhead diagram illustrating the conductor grids of a piezoelectric film sensor array according to one embodiment of the present invention;
  • FIG. 2 is a flowchart showing a routine for capturing a fingerprint image in a piezoelectric film sensor array scan according to one embodiment of the present invention;
  • FIG. 3 is a block diagram of a piezoelectric film fingerprint scanner having a piezoelectric film sensor array according to one embodiment of the present invention;
  • FIGS. 4A and 4B are plots of an example input pulse and detected output signal with ring-down oscillation according to the present invention;
  • FIG. 5 is a cross-sectional view of a piezoelectric film sensor array having a fingerprint ridge (not to scale) in contact with the sensor array; and
  • FIG. 6 is a plot of an example output signal with an extended range that shows other reflections indicative of further biometric information according to another embodiment of the present invention.
  • The present invention is described with reference to the accompanying drawings. In the drawings, like reference numbers indicate identical or functionally similar elements. Additionally, the left-most digit(s) of a reference number identifies the drawing in which the reference number first appears.
  • DETAILED DESCRIPTION OF THE EMBODIMENTS 1. Overview and Terminology
  • According to the present invention, a piezoelectric film biometric data sensing device is provided. The biometric sensing device can be, for example, a fingerprint scanner. A piezoelectric film sensor array is used to detect biometric data, for example, a fingerprint image.
  • The terms “piezoelectric” and “piezo” are used interchangeably herein to refer to the piezoelectric effect found in certain materials, including but not limited to piezoelectric polymer materials.
  • The term “conductor grid” as used herein is meant to refer to a pattern of conductors and includes, for example, a plurality of conductors arranged in parallel.
  • 2. Piezoelectric Film Sensor Array
  • FIG. 1A is a cross-sectional view of a piezoelectric film sensor array 100 according to one embodiment of the present invention. Piezoelectric film sensor array 100 is a multi-layer structure that includes a piezo film 120 sandwiched between two conductor grids 115, 125. Piezo film in one example of the instant invention is a polarized fluoropolymer film, such as polyvinylidene fluoride (PVDF) or its copolymers.
  • Conductor grids 115 and 125 each include parallel electrically conductive lines. Preferably, the lines of grid 115 are oriented orthogonally with respect to the lines of grid 125. This relationship is shown in FIG. 1B. FIG. 1B is an overhead diagram illustrating the conductor grids of a piezoelectric film sensor array according to one embodiment of the present invention. As seen in FIG. 1B, the two conductor grids are arranged orthogonally to one another such that a first of the two grids may be characterized as including conductive rows 1 to n, while a second of the two grids may be characterized as including conductive columns 1 to m. These conductive rows and columns are connected to respective associated row and column multiplexers, which will be discussed in greater detail below. Pixels within the array are the regions associated with points where ones of the rows cross ones of the columns. For example, the region where row n crosses column m corresponds to a pixel (n,m). In one example, conductor grids 115, 125 are silver ink electrodes printed on opposite sides of the PVDF film 120.
  • Returning to FIG. 1A, shield layer 110 can be added as a protective coating to a side where a finger is placed. Shield layer 110 can be made of urethane or another plastic capable of acting as a protective coating. Shield layer 110 can be affixed to conductor grid 115 and piezo film 120 with an adhesive 142. Materials suitable for use as such an adhesive are known to those skilled in the art and so the selection of an appropriate adhesive material is within the ordinary level of skill in the relevant art given this disclosure.
  • Foam substrate 130 can be used as a support within the piezo sensor array 100. Foam substrate 130 can be made of Teflon™. Other types of supportive material can be used in place of foam substrate 130, as would be apparent to a person skilled in the relevant art given this disclosure. Foam substrate 130 can be affixed to the conductor grid 125 and the piezo film 120 with an adhesive layer 144. Materials suitable for use as such an adhesive are known to those skilled in the art and so the selection of an appropriate adhesive material is within the level of skill in the art given this disclosure.
  • The above description is illustrative and not intended to limit the present invention. For example, piezo layer 120 can be any material exhibiting a piezoelectric effect including, but not limited to, piezoelectric polymers. Conductor grids 115, 125 can be any electrically conductive material including, but not limited to, metals. Likewise, other types of protective material can be used for shield layer 110 as would be apparent to a person skilled in the art given this description.
  • Piezoelectric polymer film sensors are further described in Piezo Film Sensors: Technical Manual, available from Measurement Specialties, Inc. Norristown, Pa., Apr. 2, 1999 REVB (incorporated by reference herein in its entirety).
  • 3. Peel-Off Application
  • As an additional feature of the present invention, the PVDF film, including the printed electrodes, can be peeled off like a label for easy replacement. As shown in FIG. 1, piezo sensor array 100 can be mounted by adhesive 146 onto wax-paper or other material (not shown) for easy peel off. Materials suitable for use as such an adhesive are known to those skilled in the art and so the selection of an appropriate adhesive material is within the level of skill in the art given this disclosure. This allows the piezo sensor to be installed and/or replaced simply and easily at minimum cost. Indeed, compared to optical and silicon technologies maintenance of the piezo sensor array 100 is trivial.
  • 4. Piezoelectric Film Fingerprint Scanner
  • The present invention further uses piezo film technology to detect and capture biometric data. For example, a fingerprint image can be detected.
  • The operation and structure of a piezoelectric film fingerprint scanner according to one embodiment of the present invention is described further with respect to FIGS. 2 and 3. FIG. 2 is a flowchart showing a routine 200 for capturing a fingerprint image in a piezoelectric film sensor array scan according to one embodiment of the present invention (steps 210-290). FIG. 3 is a block diagram of a piezoelectric film fingerprint scanner 300 that includes piezo film sensor array 100 according to one embodiment of the present invention. Piezo film fingerprint scanner 300 includes oscillator 310, gate counter 320, pulser 330, row multiplexer 340, column multiplexer 350, controller 360, filter 362, detector 370, memory controller 380 and image memory 385. For clarity and in the interest of brevity, the steps of routine 200 are described in further detail with respect to the structure of FIG. 3. However, routine 200 is not so limited and other structure can be used as would be apparent to a person skilled in the art given the description herein.
  • In step 210, piezo film sensor array 100 is switched to detect an initial pixel or a group of pixels. In the example of FIG. 3, controller 360 switches row multiplexer 340 to a particular row or rows and column multiplexer 350 to a particular column or columns. In this manner, a particular associated pixel or group of pixels is designated as the initial pixel or group of pixels. For example, as shown in FIG. 1B, if the row multiplexer is switched to row n and the column multiplexer is switched to column m, pixel (n, m) is designated. In one example, piezo film sensor array is a 512×512 pixel array. Multiplexers 340 and 350 are each addressed by nine digit binary numbers to select a particular grid line at a designated address of the initial pixel or group of pixels being detected.
  • In step 220, a pulse is applied in one 30 MHz cycle. Oscillator 310 generates an oscillation signal at 30 MHz. This oscillation signal is applied to gate counter 320. Gate counter 320 then initiates pulser 330 to send an input pulse to row multiplexer 340. Gate counter 320 also sends a signal to controller 360 and detector 370 indicating a count of the number of cycles. Controller 360 is coupled to row multiplexer 340 and a column multiplexer 350. Controller 360 sends signals to row multiplexer 340 and 350 that cause an initial particular pixel or group of pixels to be selected by the multiplexers 340, 350. Row multiplexer 340 forwards the input pulse to the initial pixel or group of pixels. Due to the piezoelectric characteristic of the piezo film, the pulse causes an oscillation at the pixel or pixels where the pulse is applied.
  • In step 230, piezo fingerprint scanner 300 waits a number of cycles before detecting a signal at the pixel. For example, in response to the signal sent from gate counter 320, detector 370 waits a number of cycles after the pulse is applied to the pixel (or group of pixels). Detector 370 is coupled to column multiplexer 350 and a filter circuit 362. In step 240, when the wait is complete the voltage at the initial pixel or group of pixels selected by column multiplexer 350 is evaluated at detector 370.
  • For example, one 30 MHz cycle corresponds to approximately 33 nanoseconds. The wait can be approximately 5 cycles or 150 nanoseconds. Other wait durations (e.g. a greater or smaller number of periods) can be used depending upon the oscillator frequency and/or other design considerations that would be apparent to a person skilled in the relevant art given this disclosure. This wait allows the ring down oscillation due to the presence of a fingerprint ridge to occur in response to the applied electrical pulse at the pixel.
  • In step 240, a filtered voltage is evaluated by detector 370 and a gray scale or a binary pixel value is output representative of the detected voltage (step 250). Filter circuit 362 is a band-pass filter that filters the output voltage to detect an output voltage signal in a passband centered about a frequency of approximately 30 MHz. The gray scale or binary pixel value is output to memory controller 380 for storage in an image memory 385. In one example, the output gray scale or binary pixel value is stored in an address in image memory 385 that corresponds to the detected pixel.
  • In step 260, a check is made to determine if the scan is complete. In other words, a check is made to determine whether each pixel in the 512×512 sensor array 100 has been scanned and a corresponding output value has been stored and accumulated in image memory 385. If the scan is complete, then the routine ends (step 290). A signal or other indication can then be generated and output from scanner 300 to indicate that a fingerprint image has been successfully captured. If the scan is not complete, then the piezo film sensor array 100 is switched to detect the next pixel or next group of pixels (step 270). Control then returns to perform steps 220 through 250 at the next pixel or next group of pixels.
  • Multiple Pixel Hits
  • As described above in steps 210 and 270, piezo film sensor array 100 can be switched by multiplexers 340 and 350 to detect voltage values at a single pixel or a group of pixels. In general, any pattern for scanning pixels can be used. For example, a raster scan of pixels can be performed. Pixels can be scanned row by row or column by column.
  • In one preferred example, when multiple groups of pixels are read out at a given instant, each pixel in a group of pixels are separated by a predetermined distance. In this way, interfering effects from the ring down oscillation in neighboring pixels are minimized or avoided. In one example, pixels detected in a given cycle are separated by a minimum distance of at least 8 pixels. In this way any ring down oscillations between neighboring pixels are attenuated significantly.
  • Other Implementations
  • Piezoelectric fingerprint scanner 300 as described above with respect to FIG. 3 is illustrative and not necessarily intended to limit the present invention. As it would be apparent to a person skilled in the art other implementations are possible given this description. For example, filter circuit 362 can be tuned as desired to remove noise and other oscillations. Filter circuit 362 can be a LC circuit or other type of filter circuit. Multiplexers 340 and 350 can be any type of multiplexer. For example, a single 1 to N multiplexer or multiple stages of multiplexers can be used. Oscillator 310 can be any type of oscillator, including but not limited to, a simple LC oscillator, variable-frequency oscillator, tunable oscillator, or crystal oscillator. In one preferred example, the oscillator is a radio-frequency 30 MHz oscillator. Other oscillation frequencies could be used as would be apparent to one skilled in the relevant art given this disclosure. Detector 370 can include an analog-to-digital converter (ADC) for output to a processor (e.g. a CPU) to support additional processing and control.
  • In general, control for carrying out routine 200 can be implemented in software, firmware, hardware, or any combination thereof. Such implementation would be apparent to a person skilled in the relevant art given this disclosure.
  • Fingerprint Ridge Detection
  • FIGS. 4A, 4B and 5 illustrate how fingerprint scanner 300 uses ring-down oscillation in piezo film sensor array 100 to detect a fingerprint ridge at a pixel C according to the present invention. Multiplexers 340 and 350 are switched to the address of pixel C (step 210 or 270). An input pulse in one 30 MHZ cycle is applied by pulser 330 (step 220). As shown in FIG. 4A, the voltage of the pulse (and consequently the electric field applied to pixel C) varies sinusoidally. The varying electric field causes the piezo layer 120 to likewise stress and unstress in an oscillating fashion. The stress on the piezo layer 120 creates wave energy. Such wave energy is reflected on the substrate side of piezo sensor array 100 at the interface with air. The wave energy is likewise reflected at the shield layer boundary when air is present. However, when a fingerprint ridge is present at pixel C, as shown in FIG. 5, creating a non-reflecting or transmissive boundary for the wave energy is created. This causes a ring-down oscillation to occur. This ring-down oscillation dampens over time due to inherent friction in the piezo film sensor array 100.
  • FIG. 4B shows a plot of an example detected output signal at pixel C with ring-down oscillation according to the present invention. The plots of FIGS. 4A and 4B are illustrative sketches and are not drawn to scale to represent actual signal outputs. As shown in FIG. 4B, after a wait of approximately five 30 MHZ cycles (or about 150 ns), a detector signal output can be filtered and detected to indicate the presence of a fingerprint ridge at pixel C. If the fingerprint ridge were not in contact at pixel C, ring-down oscillation would not occur. The filtered detector signal output would equal zero or at least be below a minimum voltage.
  • Extended Range and Other Biometric Information
  • Other reflections indicative of additional biometrics related to the finger (e.g. from tissue, blood, bone, fingernail, etc.) can also be detected. A Doppler effect due to reflections from circulating blood can also be detected. Such a Doppler effect can provide further information about direction and speed of blood circulation. FIG. 6 is a plot of an example output signal with an extended range that shows other reflections indicative of further biometric information according to another embodiment of the present invention.
  • Live Finger Presence Detection Based on Pyroelectric Effect
  • According to another embodiment, an instantaneous pyroelectric effect can also be detected by the piezoelectric film sensor array to indicate a live finger presence. A signal indicative of the live finger detection can then be used to automatically initiate or “awaken” the fingerprint scanner to scan and capture an image of the fingerprint using the same piezoelectric scanner array.
  • CONCLUSION
  • While various embodiments of the present invention have been described above, it should be understood that they have been presented by way of example only, and not limitation. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined in the appended claims. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.

Claims (2)

  1. 1. A biometric sensing device, comprising: a first conductor grid including a first set of conductors; a second conductor grid including a second set of conductors arranged orthogonally to said first set of conductors such that pixels within an array of pixels correspond to regions where ones of said first set of conductors cross ones of said second set of conductors; and a piezoelectric film disposed between said first and second conductor grids; wherein biometric data can be produced by applying an electric pulse to a pixel through said first and second conductor grids and measuring a voltage across said first and second conductor grids at said pixel subsequent to said application of said electric pulse.
  2. 2-17. (canceled)
US11819270 1999-08-09 2007-06-26 Biometric piezo scanner Abandoned US20080175450A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US14749799 true 1999-08-09 1999-08-09
PCT/US2000/021658 WO2001010296A3 (en) 1999-08-09 2000-08-09 Piezoelectric film fingerprint scanner
US4910002 true 2002-02-08 2002-02-08
US11819270 US20080175450A1 (en) 1999-08-09 2007-06-26 Biometric piezo scanner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US11819270 US20080175450A1 (en) 1999-08-09 2007-06-26 Biometric piezo scanner

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2000/021658 Continuation WO2001010296A3 (en) 1999-08-09 2000-08-09 Piezoelectric film fingerprint scanner
US4910002 Continuation 2002-02-08 2002-02-08

Publications (1)

Publication Number Publication Date
US20080175450A1 true true US20080175450A1 (en) 2008-07-24

Family

ID=22521801

Family Applications (2)

Application Number Title Priority Date Filing Date
US10049100 Active 2021-10-06 US7236616B1 (en) 1999-08-09 2000-08-09 Biometric piezo scanner
US11819270 Abandoned US20080175450A1 (en) 1999-08-09 2007-06-26 Biometric piezo scanner

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US10049100 Active 2021-10-06 US7236616B1 (en) 1999-08-09 2000-08-09 Biometric piezo scanner

Country Status (5)

Country Link
US (2) US7236616B1 (en)
EP (1) EP1207786B1 (en)
JP (1) JP4578041B2 (en)
DE (1) DE60043112D1 (en)
WO (1) WO2001010296A3 (en)

Cited By (55)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080186174A1 (en) * 2007-02-02 2008-08-07 Sensormatic Electronics Corporation Item level inventory with a radio frequency identification (RFID) system
US20090252384A1 (en) * 2008-04-04 2009-10-08 Validity Sensors, Inc. Fingerprint Sensing Circuit Having Programmable Sensing Patterns
US20100272329A1 (en) * 2004-10-04 2010-10-28 Validity Sensors, Inc. Fingerprint sensing assemblies and methods of making
US8077935B2 (en) 2004-04-23 2011-12-13 Validity Sensors, Inc. Methods and apparatus for acquiring a swiped fingerprint image
US8107212B2 (en) 2007-04-30 2012-01-31 Validity Sensors, Inc. Apparatus and method for protecting fingerprint sensing circuitry from electrostatic discharge
US8131026B2 (en) 2004-04-16 2012-03-06 Validity Sensors, Inc. Method and apparatus for fingerprint image reconstruction
US8165355B2 (en) 2006-09-11 2012-04-24 Validity Sensors, Inc. Method and apparatus for fingerprint motion tracking using an in-line array for use in navigation applications
US8175345B2 (en) 2004-04-16 2012-05-08 Validity Sensors, Inc. Unitized ergonomic two-dimensional fingerprint motion tracking device and method
US8204281B2 (en) 2007-12-14 2012-06-19 Validity Sensors, Inc. System and method to remove artifacts from fingerprint sensor scans
US8229184B2 (en) 2004-04-16 2012-07-24 Validity Sensors, Inc. Method and algorithm for accurate finger motion tracking
US8278946B2 (en) 2009-01-15 2012-10-02 Validity Sensors, Inc. Apparatus and method for detecting finger activity on a fingerprint sensor
US8276816B2 (en) 2007-12-14 2012-10-02 Validity Sensors, Inc. Smart card system with ergonomic fingerprint sensor and method of using
US8290150B2 (en) 2007-05-11 2012-10-16 Validity Sensors, Inc. Method and system for electronically securing an electronic device using physically unclonable functions
US8331096B2 (en) 2010-08-20 2012-12-11 Validity Sensors, Inc. Fingerprint acquisition expansion card apparatus
US8358815B2 (en) 2004-04-16 2013-01-22 Validity Sensors, Inc. Method and apparatus for two-dimensional finger motion tracking and control
US8374407B2 (en) 2009-01-28 2013-02-12 Validity Sensors, Inc. Live finger detection
US8391568B2 (en) 2008-11-10 2013-03-05 Validity Sensors, Inc. System and method for improved scanning of fingerprint edges
US8421890B2 (en) 2010-01-15 2013-04-16 Picofield Technologies, Inc. Electronic imager using an impedance sensor grid array and method of making
US8447077B2 (en) 2006-09-11 2013-05-21 Validity Sensors, Inc. Method and apparatus for fingerprint motion tracking using an in-line array
US20130160109A1 (en) * 2010-09-10 2013-06-20 Sony Ericsson Mobile Communications Ab Method and device
US8520913B2 (en) 2008-04-04 2013-08-27 Validity Sensors, Inc. Apparatus and method for reducing noise in fingerprint sensing circuits
US8538097B2 (en) 2011-01-26 2013-09-17 Validity Sensors, Inc. User input utilizing dual line scanner apparatus and method
US8594393B2 (en) 2011-01-26 2013-11-26 Validity Sensors System for and method of image reconstruction with dual line scanner using line counts
US8600122B2 (en) 2009-01-15 2013-12-03 Validity Sensors, Inc. Apparatus and method for culling substantially redundant data in fingerprint sensing circuits
US8698594B2 (en) 2008-07-22 2014-04-15 Synaptics Incorporated System, device and method for securing a user device component by authenticating the user of a biometric sensor by performance of a replication of a portion of an authentication process performed at a remote computing device
US8716613B2 (en) 2010-03-02 2014-05-06 Synaptics Incoporated Apparatus and method for electrostatic discharge protection
US8791792B2 (en) 2010-01-15 2014-07-29 Idex Asa Electronic imager using an impedance sensor grid array mounted on or about a switch and method of making
US8866347B2 (en) 2010-01-15 2014-10-21 Idex Asa Biometric image sensing
US20140354596A1 (en) * 2013-06-03 2014-12-04 Qualcomm Incorporated Display with peripherally configured ultrasonic biometric sensor
US9001040B2 (en) 2010-06-02 2015-04-07 Synaptics Incorporated Integrated fingerprint sensor and navigation device
US9137438B2 (en) 2012-03-27 2015-09-15 Synaptics Incorporated Biometric object sensor and method
US9152838B2 (en) 2012-03-29 2015-10-06 Synaptics Incorporated Fingerprint sensor packagings and methods
US9195877B2 (en) 2011-12-23 2015-11-24 Synaptics Incorporated Methods and devices for capacitive image sensing
US9251329B2 (en) 2012-03-27 2016-02-02 Synaptics Incorporated Button depress wakeup and wakeup strategy
US9262003B2 (en) 2013-11-04 2016-02-16 Qualcomm Incorporated Piezoelectric force sensing array
US9268991B2 (en) 2012-03-27 2016-02-23 Synaptics Incorporated Method of and system for enrolling and matching biometric data
US9274553B2 (en) 2009-10-30 2016-03-01 Synaptics Incorporated Fingerprint sensor and integratable electronic display
US9336428B2 (en) 2009-10-30 2016-05-10 Synaptics Incorporated Integrated fingerprint sensor and display
US9400911B2 (en) 2009-10-30 2016-07-26 Synaptics Incorporated Fingerprint sensor and integratable electronic display
US9406580B2 (en) 2011-03-16 2016-08-02 Synaptics Incorporated Packaging for fingerprint sensors and methods of manufacture
US9600709B2 (en) 2012-03-28 2017-03-21 Synaptics Incorporated Methods and systems for enrolling biometric data
US9607203B1 (en) 2014-09-30 2017-03-28 Apple Inc. Biometric sensing device with discrete ultrasonic transducers
US9665762B2 (en) 2013-01-11 2017-05-30 Synaptics Incorporated Tiered wakeup strategy
US9666635B2 (en) 2010-02-19 2017-05-30 Synaptics Incorporated Fingerprint sensing circuit
US9747488B2 (en) 2014-09-30 2017-08-29 Apple Inc. Active sensing element for acoustic imaging systems
US9785299B2 (en) 2012-01-03 2017-10-10 Synaptics Incorporated Structures and manufacturing methods for glass covered electronic devices
US9798917B2 (en) 2012-04-10 2017-10-24 Idex Asa Biometric sensing
US9824254B1 (en) 2014-09-30 2017-11-21 Apple Inc. Biometric sensing device with discrete ultrasonic transducers
US9904836B2 (en) * 2014-09-30 2018-02-27 Apple Inc. Reducing edge effects within segmented acoustic imaging systems
WO2018047878A1 (en) * 2016-09-06 2018-03-15 積水化学工業株式会社 Piezoelectric sensor
US9952095B1 (en) 2014-09-29 2018-04-24 Apple Inc. Methods and systems for modulation and demodulation of optical signals
US9979955B1 (en) 2014-09-30 2018-05-22 Apple Inc. Calibration methods for near-field acoustic imaging systems
US9984271B1 (en) 2014-09-30 2018-05-29 Apple Inc. Ultrasonic fingerprint sensor in display bezel
US10043052B2 (en) 2011-10-27 2018-08-07 Synaptics Incorporated Electronic device packages and methods
US10055629B2 (en) 2014-08-05 2018-08-21 Lg Innotek Co., Ltd. Fingerprint sensor and touch device including the same

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1207786B1 (en) * 1999-08-09 2009-10-07 Sonavation, Inc. Piezoelectric film fingerprint scanner
EP1254425B1 (en) * 2000-02-09 2006-04-05 Infineon Technologies AG Fingerprint sensor and method for the operation thereof
US7067962B2 (en) 2000-03-23 2006-06-27 Cross Match Technologies, Inc. Multiplexer for a piezo ceramic identification device
US20030001459A1 (en) * 2000-03-23 2003-01-02 Cross Match Technologies, Inc. Secure wireless sales transaction using print information to verify a purchaser's identity
EP1266346B1 (en) 2000-03-23 2009-04-29 Cross Match Technologies, Inc. Piezoelectric biometric identification device and applications thereof
EP2328111A1 (en) 2002-05-09 2011-06-01 Sony Corporation Method of detecting biological pattern, biologial pattern detector, method of biological certificate and biological certificate apparatus
US7760918B2 (en) * 2003-08-06 2010-07-20 Zinayida Bezvershenko Identification of a person based on ultra-sound scan analyses of hand bone geometry
CA2438220C (en) * 2003-08-06 2011-11-08 Click-Into Inc. Identification of a person based on ultra-sound scan analyses of hand bone geometry
JP4784041B2 (en) * 2003-11-07 2011-09-28 パナソニック株式会社 Input device using a touch panel
KR100561851B1 (en) * 2003-11-18 2006-03-16 삼성전자주식회사 Fingerprint Sensor and Fabrication Method thereof
JP2007143623A (en) * 2005-11-24 2007-06-14 Seiko Instruments Inc Biological information measuring apparatus
US7515252B2 (en) 2005-12-30 2009-04-07 Cardinal Health 303, Inc. Optical fingerprint imaging system and method with protective film
US20080080750A1 (en) * 2006-10-02 2008-04-03 Wison Technology Corp. Interactive wireless fingerprint recognition system
JP4254840B2 (en) * 2006-10-12 2009-04-15 セイコーエプソン株式会社 Suppression of uneven density in the printing
CN101978381B (en) * 2008-01-09 2015-05-20 纳米识别技术股份公司 Biometric security device
US8212575B2 (en) * 2008-12-29 2012-07-03 Lexmark International, Inc. Device for analyzing size and location of conductive item
DE102009051704A1 (en) * 2009-11-03 2011-05-05 Gabriele Trinkel Biometric data detection device for e.g. payment transaction, has detection system i.e. finger scanner system, for detecting technical parameters simultaneously or in time intervals, and sensor integrated into plate
US8977013B2 (en) * 2010-07-12 2015-03-10 The Institute For Diagnostic Imaging Research, University Of Windsor Biometric sensor and method for generating a three-dimensional representation of a portion of a finger
US9798372B2 (en) 2013-06-03 2017-10-24 Qualcomm Incorporated Devices and methods of sensing combined ultrasonic and infrared signal
US9582705B2 (en) 2014-08-31 2017-02-28 Qualcomm Incorporated Layered filtering for biometric sensors
US9665763B2 (en) 2014-08-31 2017-05-30 Qualcomm Incorporated Finger/non-finger determination for biometric sensors
US9195879B1 (en) 2014-08-31 2015-11-24 Qualcomm Incorporated Air/object determination for biometric sensors
CN104553113A (en) * 2014-12-11 2015-04-29 业成光电(深圳)有限公司 Acoustic wave fingerprint identification component and manufacturing method thereof
CN105091725B (en) * 2015-08-31 2017-12-22 中国矿业大学 One kind of articular cartilage wear evaluation method

Citations (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979565A (en) * 1975-08-11 1976-09-07 Westinghouse Electric Corporation Metal enclosed transducer assembly
US4265126A (en) * 1979-06-15 1981-05-05 General Electric Company Measurement of true blood velocity by an ultrasound system
US4316115A (en) * 1979-12-03 1982-02-16 Raytheon Company Polymeric piezoelectric microprobe with damper
US4394773A (en) * 1980-07-21 1983-07-19 Siemens Corporation Fingerprint sensor
US4429413A (en) * 1981-07-30 1984-01-31 Siemens Corporation Fingerprint sensor
US4437033A (en) * 1980-06-06 1984-03-13 Siemens Aktiengesellschaft Ultrasonic transducer matrix having filler material with different acoustical impedance
US4499394A (en) * 1983-10-21 1985-02-12 Koal Jan G Polymer piezoelectric sensor of animal foot pressure
US4536673A (en) * 1984-01-09 1985-08-20 Siemens Aktiengesellschaft Piezoelectric ultrasonic converter with polyurethane foam damper
US4539554A (en) * 1982-10-18 1985-09-03 At&T Bell Laboratories Analog integrated circuit pressure sensor
US4555953A (en) * 1984-04-16 1985-12-03 Paolo Dario Composite, multifunctional tactile sensor
US4616152A (en) * 1983-11-09 1986-10-07 Matsushita Electric Industrial Co., Ltd. Piezoelectric ultrasonic probe using an epoxy resin and iron carbonyl acoustic matching layer
US4634028A (en) * 1984-11-16 1987-01-06 Larosiere Pierre J De Container reinforcement
US4709342A (en) * 1983-08-03 1987-11-24 Hitachi, Ltd. Tactile sensing apparatus
US4747192A (en) * 1983-12-28 1988-05-31 Kabushiki Kaisha Toshiba Method of manufacturing an ultrasonic transducer
US4814661A (en) * 1986-05-23 1989-03-21 Washington State University Research Foundation, Inc. Systems for measurement and analysis of forces exerted during human locomotion
US4849668A (en) * 1987-05-19 1989-07-18 Massachusetts Institute Of Technology Embedded piezoelectric structure and control
US5055838A (en) * 1988-12-09 1991-10-08 The Regents Of The University Of Michigan Silicon tactile imaging array and method of making same
US5079949A (en) * 1990-07-06 1992-01-14 Enix Corporation Surface pressure distribution detecting element
US5097709A (en) * 1989-02-16 1992-03-24 Hitachi, Ltd. Ultrasonic imaging system
US5224174A (en) * 1990-11-07 1993-06-29 Niagara Technology Incorporated Surface feature mapping using high resolution c-scan ultrasonography
US5240004A (en) * 1989-04-28 1993-08-31 Thomas Jefferson University Intravascular, ultrasonic imaging catheters and methods for making same
US5258922A (en) * 1989-06-12 1993-11-02 Wieslaw Bicz Process and device for determining of surface structures
US5273045A (en) * 1991-05-23 1993-12-28 Fujitsu Limited Ultrasonic equipment and its catheter-type ultrasonic probe
US5305752A (en) * 1991-05-31 1994-04-26 Thermotrex Corporation Acoustic imaging device
US5311095A (en) * 1992-05-14 1994-05-10 Duke University Ultrasonic transducer array
US5321765A (en) * 1986-05-07 1994-06-14 Costello Brendan D Method and apparatus for verifying identity
US5337369A (en) * 1992-09-09 1994-08-09 Nec Corporation Equipment for fingerprint pattern classification
US5339051A (en) * 1991-12-09 1994-08-16 Sandia Corporation Micro-machined resonator oscillator
US5365154A (en) * 1991-07-12 1994-11-15 North Coast Electronics, Inc. Appliance control system and method
US5370120A (en) * 1992-12-08 1994-12-06 Siemens Aktiengesellschaft Ultrasound imaging apparatus
US5374787A (en) * 1992-06-08 1994-12-20 Synaptics, Inc. Object position detector
US5389849A (en) * 1993-01-20 1995-02-14 Olympus Optical Co., Ltd. Tactility providing apparatus and manipulating device using the same
US5406163A (en) * 1990-06-25 1995-04-11 Carson; Paul L. Ultrasonic image sensing array with acoustical backing
US5421335A (en) * 1994-01-21 1995-06-06 Wild; John J. Intrinsically collimated ultrasonic transducer
US5424596A (en) * 1992-10-05 1995-06-13 Trw Inc. Activated structure
US5456256A (en) * 1993-11-04 1995-10-10 Ultra-Scan Corporation High resolution ultrasonic imaging apparatus and method
US5500635A (en) * 1990-02-20 1996-03-19 Mott; Jonathan C. Products incorporating piezoelectric material
US5515738A (en) * 1993-10-19 1996-05-14 Enix Corporation Piezoelectric surface pressure input panel
US5526701A (en) * 1993-10-25 1996-06-18 Enix Corporation Magnetic surface pressure input panel
US5543590A (en) * 1992-06-08 1996-08-06 Synaptics, Incorporated Object position detector with edge motion feature
US5550274A (en) * 1994-03-30 1996-08-27 Reierson; Robert L. In-situ phosphation reagent process
US5578761A (en) * 1995-08-25 1996-11-26 Duke University Adaptive piezoelectric sensoriactuator
US5623930A (en) * 1995-05-02 1997-04-29 Acuson Corporation Ultrasound system for flow measurement
US5647364A (en) * 1995-02-15 1997-07-15 Ultra-Scan Corporation Ultrasonic biometric imaging and identity verification system
US5673041A (en) * 1994-03-30 1997-09-30 Chatigny; Joseph Victor Reflective mode ultrasonic touch sensitive switch
US5760530A (en) * 1992-12-22 1998-06-02 The United States Of America As Represented By The Secretary Of The Air Force Piezoelectric tactile sensor
US5844287A (en) * 1995-10-17 1998-12-01 France Telecom Monolithic sensor of fingerprints
US5870723A (en) * 1994-11-28 1999-02-09 Pare, Jr.; David Ferrin Tokenless biometric transaction authorization method and system
US5889236A (en) * 1992-06-08 1999-03-30 Synaptics Incorporated Pressure sensitive scrollbar feature
US5902240A (en) * 1996-02-21 1999-05-11 Sekisui Kagaku Kogyo Kabushiki Kaisya Method and apparatus for osteoporosis diagnosis
US5907521A (en) * 1995-06-23 1999-05-25 Murata Manufacturing Co., Ltd. Ultrasonic range finder using ultrasonic sensor
US5971927A (en) * 1996-10-21 1999-10-26 Kabushiki Kaisha Toshiba Ultrasonic diagnostic apparatus for obtaining blood data
US6002786A (en) * 1998-01-22 1999-12-14 Sagem Sa Device for imaging prints
US6038666A (en) * 1997-12-22 2000-03-14 Trw Inc. Remote identity verification technique using a personal identification device
US6061464A (en) * 1996-11-05 2000-05-09 Thomson-Csf Fingerprint-reading system with integrated heating resistors
US6095979A (en) * 1996-01-29 2000-08-01 Aloka Co., Ltd. Bone assessment apparatus
US6111342A (en) * 1993-03-17 2000-08-29 Seiko Instruments Inc. Instrument for chemical measurement
US6117075A (en) * 1998-09-21 2000-09-12 Meduck Ltd. Depth of anesthesia monitor
US6120449A (en) * 1998-11-25 2000-09-19 General Electric Company Method and apparatus for compensating for inoperative elements in ultrasonic transducer array
US6131464A (en) * 1998-06-16 2000-10-17 Smarttouch, Inc. Pressure sensitive biometric input apparatus
US6162485A (en) * 1998-05-07 2000-12-19 Wallace Computers Services, Inc. Fingerprinting system and method
US6183419B1 (en) * 1999-02-01 2001-02-06 General Electric Company Multiplexed array transducers with improved far-field performance
US6234031B1 (en) * 1997-11-27 2001-05-22 Nec Corporaion Fingerprint detection apparatus
US6289114B1 (en) * 1996-06-14 2001-09-11 Thomson-Csf Fingerprint-reading system
US6411726B1 (en) * 1998-10-08 2002-06-25 Durel Corporation Fingerprint detector using an EL lamp
US6437583B1 (en) * 1996-02-14 2002-08-20 Stmicroelectronics, Inc.. Capacitive distance sensor
US6461314B1 (en) * 1999-02-02 2002-10-08 Transurgical, Inc. Intrabody hifu applicator
US20030001459A1 (en) * 2000-03-23 2003-01-02 Cross Match Technologies, Inc. Secure wireless sales transaction using print information to verify a purchaser's identity
US6517487B1 (en) * 1995-03-01 2003-02-11 Lunar Corporation Ultrasonic densitometer with opposed single transducer and transducer array
US6522773B1 (en) * 1998-03-03 2003-02-18 Siemens Aktiengesellschaft Fingertip sensor with integrated key switch
US6714666B1 (en) * 1999-06-10 2004-03-30 Nippon Telegraph And Telephone Corporation Surface shape recognition apparatus
US6720712B2 (en) * 2000-03-23 2004-04-13 Cross Match Technologies, Inc. Piezoelectric identification device and applications thereof
US6817130B2 (en) * 2002-06-17 2004-11-16 New Jersey Institute Of Technology Sensor array for unauthorized user prevention device
US6954025B2 (en) * 2002-05-13 2005-10-11 University Of Florida Research Foundation, Inc. Resonant energy MEMS array and system including dynamically modifiable power processor
US7067962B2 (en) * 2000-03-23 2006-06-27 Cross Match Technologies, Inc. Multiplexer for a piezo ceramic identification device
US7132780B2 (en) * 2000-03-23 2006-11-07 Cross Match Technologies, Inc. Method for obtaining biometric data for an individual in a secure transaction
US7236616B1 (en) * 1999-08-09 2007-06-26 Cross Match Technologies, Inc. Biometric piezo scanner

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60196688A (en) 1984-03-19 1985-10-05 Hitachi Medical Corp Scanning type ultrasonic wave apparatus
US4634917A (en) 1984-12-26 1987-01-06 Battelle Memorial Institute Active multi-layer piezoelectric tactile sensor apparatus and method
EP0587408A1 (en) 1992-09-07 1994-03-16 Terumo Kabushiki Kaisha Method for determination of DNA and sensor therefor
JP3268907B2 (en) 1993-08-26 2002-03-25 株式会社日立メディコ Ultrasonic probe
JP3724846B2 (en) 1995-06-15 2005-12-07 株式会社東芝 The ultrasonic diagnostic apparatus
DE19750179A1 (en) 1997-08-23 1999-02-25 Fraunhofer Ges Forschung Sonic transducer e.g. for air
DE60040795D1 (en) 1999-09-10 2008-12-24 Ultra Scan Corp Mobile fingerprint scanner and coupling device
WO2001018740A1 (en) 1999-09-10 2001-03-15 Ultra-Scan Corporation Left hand right hand invariant dynamic finger positioning guide
WO2001067383A1 (en) 2000-03-06 2001-09-13 Koo Hong Sik A method of settlement of an electronic card organizer for financial information using a fingerprinter information
CA2409826C (en) 2000-06-01 2010-02-02 Science Applications International Corporation Systems and methods for monitoring health and delivering drugs transdermally
WO2002012660A1 (en) 2000-08-03 2002-02-14 Koo Hong Sik Method, device, and system for door lock
WO2002048485A1 (en) 2000-12-15 2002-06-20 Hong-Sik Koo Fingerprint recognition key, lock, and control method
KR100408835B1 (en) 2001-08-07 2003-12-06 구홍식 Method For Division Saving A Living Body Information

Patent Citations (91)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3979565A (en) * 1975-08-11 1976-09-07 Westinghouse Electric Corporation Metal enclosed transducer assembly
US4265126A (en) * 1979-06-15 1981-05-05 General Electric Company Measurement of true blood velocity by an ultrasound system
US4316115A (en) * 1979-12-03 1982-02-16 Raytheon Company Polymeric piezoelectric microprobe with damper
US4437033A (en) * 1980-06-06 1984-03-13 Siemens Aktiengesellschaft Ultrasonic transducer matrix having filler material with different acoustical impedance
US4394773A (en) * 1980-07-21 1983-07-19 Siemens Corporation Fingerprint sensor
US4429413A (en) * 1981-07-30 1984-01-31 Siemens Corporation Fingerprint sensor
US4539554A (en) * 1982-10-18 1985-09-03 At&T Bell Laboratories Analog integrated circuit pressure sensor
US4709342A (en) * 1983-08-03 1987-11-24 Hitachi, Ltd. Tactile sensing apparatus
US4499394A (en) * 1983-10-21 1985-02-12 Koal Jan G Polymer piezoelectric sensor of animal foot pressure
US4616152A (en) * 1983-11-09 1986-10-07 Matsushita Electric Industrial Co., Ltd. Piezoelectric ultrasonic probe using an epoxy resin and iron carbonyl acoustic matching layer
US4747192A (en) * 1983-12-28 1988-05-31 Kabushiki Kaisha Toshiba Method of manufacturing an ultrasonic transducer
US4536673A (en) * 1984-01-09 1985-08-20 Siemens Aktiengesellschaft Piezoelectric ultrasonic converter with polyurethane foam damper
US4555953A (en) * 1984-04-16 1985-12-03 Paolo Dario Composite, multifunctional tactile sensor
US4634028A (en) * 1984-11-16 1987-01-06 Larosiere Pierre J De Container reinforcement
US5321765A (en) * 1986-05-07 1994-06-14 Costello Brendan D Method and apparatus for verifying identity
US4814661A (en) * 1986-05-23 1989-03-21 Washington State University Research Foundation, Inc. Systems for measurement and analysis of forces exerted during human locomotion
US4849668A (en) * 1987-05-19 1989-07-18 Massachusetts Institute Of Technology Embedded piezoelectric structure and control
US5055838A (en) * 1988-12-09 1991-10-08 The Regents Of The University Of Michigan Silicon tactile imaging array and method of making same
US5097709A (en) * 1989-02-16 1992-03-24 Hitachi, Ltd. Ultrasonic imaging system
US5240004A (en) * 1989-04-28 1993-08-31 Thomas Jefferson University Intravascular, ultrasonic imaging catheters and methods for making same
US5258922A (en) * 1989-06-12 1993-11-02 Wieslaw Bicz Process and device for determining of surface structures
US5500635A (en) * 1990-02-20 1996-03-19 Mott; Jonathan C. Products incorporating piezoelectric material
US5406163A (en) * 1990-06-25 1995-04-11 Carson; Paul L. Ultrasonic image sensing array with acoustical backing
US5079949A (en) * 1990-07-06 1992-01-14 Enix Corporation Surface pressure distribution detecting element
US5224174A (en) * 1990-11-07 1993-06-29 Niagara Technology Incorporated Surface feature mapping using high resolution c-scan ultrasonography
US5587533A (en) * 1990-11-07 1996-12-24 Ultra-Scan Corporation Surface feature mapping using high resolution C-scan ultrasonography
US5689576A (en) * 1990-11-07 1997-11-18 Ultra-Scan Corporation Surface feature mapping using high resolution C-scan ultrasonography
US5273045A (en) * 1991-05-23 1993-12-28 Fujitsu Limited Ultrasonic equipment and its catheter-type ultrasonic probe
US5305752A (en) * 1991-05-31 1994-04-26 Thermotrex Corporation Acoustic imaging device
US5365154A (en) * 1991-07-12 1994-11-15 North Coast Electronics, Inc. Appliance control system and method
US5339051A (en) * 1991-12-09 1994-08-16 Sandia Corporation Micro-machined resonator oscillator
US5311095A (en) * 1992-05-14 1994-05-10 Duke University Ultrasonic transducer array
US5889236A (en) * 1992-06-08 1999-03-30 Synaptics Incorporated Pressure sensitive scrollbar feature
US5543590A (en) * 1992-06-08 1996-08-06 Synaptics, Incorporated Object position detector with edge motion feature
US5374787A (en) * 1992-06-08 1994-12-20 Synaptics, Inc. Object position detector
US5337369A (en) * 1992-09-09 1994-08-09 Nec Corporation Equipment for fingerprint pattern classification
US5424596A (en) * 1992-10-05 1995-06-13 Trw Inc. Activated structure
US5370120A (en) * 1992-12-08 1994-12-06 Siemens Aktiengesellschaft Ultrasound imaging apparatus
US5760530A (en) * 1992-12-22 1998-06-02 The United States Of America As Represented By The Secretary Of The Air Force Piezoelectric tactile sensor
US5389849A (en) * 1993-01-20 1995-02-14 Olympus Optical Co., Ltd. Tactility providing apparatus and manipulating device using the same
US6111342A (en) * 1993-03-17 2000-08-29 Seiko Instruments Inc. Instrument for chemical measurement
US5515738A (en) * 1993-10-19 1996-05-14 Enix Corporation Piezoelectric surface pressure input panel
US5526701A (en) * 1993-10-25 1996-06-18 Enix Corporation Magnetic surface pressure input panel
US5456256A (en) * 1993-11-04 1995-10-10 Ultra-Scan Corporation High resolution ultrasonic imaging apparatus and method
US5421335A (en) * 1994-01-21 1995-06-06 Wild; John J. Intrinsically collimated ultrasonic transducer
US5550274A (en) * 1994-03-30 1996-08-27 Reierson; Robert L. In-situ phosphation reagent process
US5673041A (en) * 1994-03-30 1997-09-30 Chatigny; Joseph Victor Reflective mode ultrasonic touch sensitive switch
US5870723A (en) * 1994-11-28 1999-02-09 Pare, Jr.; David Ferrin Tokenless biometric transaction authorization method and system
US5935071A (en) * 1995-02-15 1999-08-10 Ultra-Scan Corporation Ultrasonic biometric imaging and identity verification system
US6296610B1 (en) * 1995-02-15 2001-10-02 Ultra-Scan Corporation Ultrasonic biometric imaging and identity verification system
US5647364A (en) * 1995-02-15 1997-07-15 Ultra-Scan Corporation Ultrasonic biometric imaging and identity verification system
US6517487B1 (en) * 1995-03-01 2003-02-11 Lunar Corporation Ultrasonic densitometer with opposed single transducer and transducer array
US5623930A (en) * 1995-05-02 1997-04-29 Acuson Corporation Ultrasound system for flow measurement
US5907521A (en) * 1995-06-23 1999-05-25 Murata Manufacturing Co., Ltd. Ultrasonic range finder using ultrasonic sensor
US5578761A (en) * 1995-08-25 1996-11-26 Duke University Adaptive piezoelectric sensoriactuator
US5844287A (en) * 1995-10-17 1998-12-01 France Telecom Monolithic sensor of fingerprints
US6095979A (en) * 1996-01-29 2000-08-01 Aloka Co., Ltd. Bone assessment apparatus
US6437583B1 (en) * 1996-02-14 2002-08-20 Stmicroelectronics, Inc.. Capacitive distance sensor
US5902240A (en) * 1996-02-21 1999-05-11 Sekisui Kagaku Kogyo Kabushiki Kaisya Method and apparatus for osteoporosis diagnosis
US6459804B2 (en) * 1996-06-14 2002-10-01 Thomson-Csf Fingerprint-reading system
US20010026636A1 (en) * 1996-06-14 2001-10-04 Thomson-Csf Fingerprint-reading system
US6289114B1 (en) * 1996-06-14 2001-09-11 Thomson-Csf Fingerprint-reading system
US5971927A (en) * 1996-10-21 1999-10-26 Kabushiki Kaisha Toshiba Ultrasonic diagnostic apparatus for obtaining blood data
US6061464A (en) * 1996-11-05 2000-05-09 Thomson-Csf Fingerprint-reading system with integrated heating resistors
US6234031B1 (en) * 1997-11-27 2001-05-22 Nec Corporaion Fingerprint detection apparatus
US6038666A (en) * 1997-12-22 2000-03-14 Trw Inc. Remote identity verification technique using a personal identification device
US6002786A (en) * 1998-01-22 1999-12-14 Sagem Sa Device for imaging prints
US6522773B1 (en) * 1998-03-03 2003-02-18 Siemens Aktiengesellschaft Fingertip sensor with integrated key switch
US6162485A (en) * 1998-05-07 2000-12-19 Wallace Computers Services, Inc. Fingerprinting system and method
US6131464A (en) * 1998-06-16 2000-10-17 Smarttouch, Inc. Pressure sensitive biometric input apparatus
US6117075A (en) * 1998-09-21 2000-09-12 Meduck Ltd. Depth of anesthesia monitor
US6411726B1 (en) * 1998-10-08 2002-06-25 Durel Corporation Fingerprint detector using an EL lamp
US6120449A (en) * 1998-11-25 2000-09-19 General Electric Company Method and apparatus for compensating for inoperative elements in ultrasonic transducer array
US6183419B1 (en) * 1999-02-01 2001-02-06 General Electric Company Multiplexed array transducers with improved far-field performance
US6461314B1 (en) * 1999-02-02 2002-10-08 Transurgical, Inc. Intrabody hifu applicator
US6714666B1 (en) * 1999-06-10 2004-03-30 Nippon Telegraph And Telephone Corporation Surface shape recognition apparatus
US7236616B1 (en) * 1999-08-09 2007-06-26 Cross Match Technologies, Inc. Biometric piezo scanner
US6844660B2 (en) * 2000-03-23 2005-01-18 Cross Match Technologies, Inc. Method for obtaining biometric data for an individual in a secure transaction
US20040140735A1 (en) * 2000-03-23 2004-07-22 Cross Match Technologies, Inc. Biometric sensing device with isolated piezo ceramic elements
US6720712B2 (en) * 2000-03-23 2004-04-13 Cross Match Technologies, Inc. Piezoelectric identification device and applications thereof
US20070132342A1 (en) * 2000-03-23 2007-06-14 Scott Walter G Method for obtaining biometric data for an individual in a secure transaction
US6812621B2 (en) * 2000-03-23 2004-11-02 Cross Match Technologies, Inc. Multiplexer for a piezo ceramic identification device
US20070126315A1 (en) * 2000-03-23 2007-06-07 Cross Match Technologies, Inc. Multiplexer for a piezo ceramic identification device
US20050225212A1 (en) * 2000-03-23 2005-10-13 Scott Walter G Biometric sensing device with isolated piezo ceramic elements
US7067962B2 (en) * 2000-03-23 2006-06-27 Cross Match Technologies, Inc. Multiplexer for a piezo ceramic identification device
US20030001459A1 (en) * 2000-03-23 2003-01-02 Cross Match Technologies, Inc. Secure wireless sales transaction using print information to verify a purchaser's identity
US7141918B2 (en) * 2000-03-23 2006-11-28 Cross Match Technologies, Inc. Method for obtaining biometric data for an individual in a secure transaction
US20070108873A1 (en) * 2000-03-23 2007-05-17 Cross March Technologies, Inc. Method for obtaining biometric data for an individual in a secure transaction
US7132780B2 (en) * 2000-03-23 2006-11-07 Cross Match Technologies, Inc. Method for obtaining biometric data for an individual in a secure transaction
US6954025B2 (en) * 2002-05-13 2005-10-11 University Of Florida Research Foundation, Inc. Resonant energy MEMS array and system including dynamically modifiable power processor
US6817130B2 (en) * 2002-06-17 2004-11-16 New Jersey Institute Of Technology Sensor array for unauthorized user prevention device

Cited By (74)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8131026B2 (en) 2004-04-16 2012-03-06 Validity Sensors, Inc. Method and apparatus for fingerprint image reconstruction
US8811688B2 (en) 2004-04-16 2014-08-19 Synaptics Incorporated Method and apparatus for fingerprint image reconstruction
US8315444B2 (en) 2004-04-16 2012-11-20 Validity Sensors, Inc. Unitized ergonomic two-dimensional fingerprint motion tracking device and method
US8229184B2 (en) 2004-04-16 2012-07-24 Validity Sensors, Inc. Method and algorithm for accurate finger motion tracking
US8175345B2 (en) 2004-04-16 2012-05-08 Validity Sensors, Inc. Unitized ergonomic two-dimensional fingerprint motion tracking device and method
US8358815B2 (en) 2004-04-16 2013-01-22 Validity Sensors, Inc. Method and apparatus for two-dimensional finger motion tracking and control
US8077935B2 (en) 2004-04-23 2011-12-13 Validity Sensors, Inc. Methods and apparatus for acquiring a swiped fingerprint image
US20100272329A1 (en) * 2004-10-04 2010-10-28 Validity Sensors, Inc. Fingerprint sensing assemblies and methods of making
US8224044B2 (en) 2004-10-04 2012-07-17 Validity Sensors, Inc. Fingerprint sensing assemblies and methods of making
US8867799B2 (en) 2004-10-04 2014-10-21 Synaptics Incorporated Fingerprint sensing assemblies and methods of making
US8447077B2 (en) 2006-09-11 2013-05-21 Validity Sensors, Inc. Method and apparatus for fingerprint motion tracking using an in-line array
US8165355B2 (en) 2006-09-11 2012-04-24 Validity Sensors, Inc. Method and apparatus for fingerprint motion tracking using an in-line array for use in navigation applications
US8693736B2 (en) 2006-09-11 2014-04-08 Synaptics Incorporated System for determining the motion of a fingerprint surface with respect to a sensor surface
US20080186174A1 (en) * 2007-02-02 2008-08-07 Sensormatic Electronics Corporation Item level inventory with a radio frequency identification (RFID) system
US8107212B2 (en) 2007-04-30 2012-01-31 Validity Sensors, Inc. Apparatus and method for protecting fingerprint sensing circuitry from electrostatic discharge
US8290150B2 (en) 2007-05-11 2012-10-16 Validity Sensors, Inc. Method and system for electronically securing an electronic device using physically unclonable functions
US8276816B2 (en) 2007-12-14 2012-10-02 Validity Sensors, Inc. Smart card system with ergonomic fingerprint sensor and method of using
US8204281B2 (en) 2007-12-14 2012-06-19 Validity Sensors, Inc. System and method to remove artifacts from fingerprint sensor scans
US7953258B2 (en) * 2008-04-04 2011-05-31 Validity Sensors, Inc. Fingerprint sensing circuit having programmable sensing patterns
USRE45601E1 (en) * 2008-04-04 2015-07-07 Synaptics Incorporated Fingerprint sensing circuit having programmable sensing patterns
US20090252384A1 (en) * 2008-04-04 2009-10-08 Validity Sensors, Inc. Fingerprint Sensing Circuit Having Programmable Sensing Patterns
US8520913B2 (en) 2008-04-04 2013-08-27 Validity Sensors, Inc. Apparatus and method for reducing noise in fingerprint sensing circuits
US8787632B2 (en) 2008-04-04 2014-07-22 Synaptics Incorporated Apparatus and method for reducing noise in fingerprint sensing circuits
US8698594B2 (en) 2008-07-22 2014-04-15 Synaptics Incorporated System, device and method for securing a user device component by authenticating the user of a biometric sensor by performance of a replication of a portion of an authentication process performed at a remote computing device
US8391568B2 (en) 2008-11-10 2013-03-05 Validity Sensors, Inc. System and method for improved scanning of fingerprint edges
US8278946B2 (en) 2009-01-15 2012-10-02 Validity Sensors, Inc. Apparatus and method for detecting finger activity on a fingerprint sensor
US8593160B2 (en) 2009-01-15 2013-11-26 Validity Sensors, Inc. Apparatus and method for finger activity on a fingerprint sensor
US8600122B2 (en) 2009-01-15 2013-12-03 Validity Sensors, Inc. Apparatus and method for culling substantially redundant data in fingerprint sensing circuits
US8374407B2 (en) 2009-01-28 2013-02-12 Validity Sensors, Inc. Live finger detection
US9336428B2 (en) 2009-10-30 2016-05-10 Synaptics Incorporated Integrated fingerprint sensor and display
US9274553B2 (en) 2009-10-30 2016-03-01 Synaptics Incorporated Fingerprint sensor and integratable electronic display
US9400911B2 (en) 2009-10-30 2016-07-26 Synaptics Incorporated Fingerprint sensor and integratable electronic display
US8791792B2 (en) 2010-01-15 2014-07-29 Idex Asa Electronic imager using an impedance sensor grid array mounted on or about a switch and method of making
US9600704B2 (en) 2010-01-15 2017-03-21 Idex Asa Electronic imager using an impedance sensor grid array and method of making
US8421890B2 (en) 2010-01-15 2013-04-16 Picofield Technologies, Inc. Electronic imager using an impedance sensor grid array and method of making
US8866347B2 (en) 2010-01-15 2014-10-21 Idex Asa Biometric image sensing
US9659208B2 (en) 2010-01-15 2017-05-23 Idex Asa Biometric image sensing
US9268988B2 (en) 2010-01-15 2016-02-23 Idex Asa Biometric image sensing
US9666635B2 (en) 2010-02-19 2017-05-30 Synaptics Incorporated Fingerprint sensing circuit
US8716613B2 (en) 2010-03-02 2014-05-06 Synaptics Incoporated Apparatus and method for electrostatic discharge protection
US9001040B2 (en) 2010-06-02 2015-04-07 Synaptics Incorporated Integrated fingerprint sensor and navigation device
US8331096B2 (en) 2010-08-20 2012-12-11 Validity Sensors, Inc. Fingerprint acquisition expansion card apparatus
US20130160109A1 (en) * 2010-09-10 2013-06-20 Sony Ericsson Mobile Communications Ab Method and device
US9330243B2 (en) * 2010-09-10 2016-05-03 Sony Corporation Method for biometrically controlling device access and device therefor
US8538097B2 (en) 2011-01-26 2013-09-17 Validity Sensors, Inc. User input utilizing dual line scanner apparatus and method
US8594393B2 (en) 2011-01-26 2013-11-26 Validity Sensors System for and method of image reconstruction with dual line scanner using line counts
US8811723B2 (en) 2011-01-26 2014-08-19 Synaptics Incorporated User input utilizing dual line scanner apparatus and method
US8929619B2 (en) 2011-01-26 2015-01-06 Synaptics Incorporated System and method of image reconstruction with dual line scanner using line counts
US9406580B2 (en) 2011-03-16 2016-08-02 Synaptics Incorporated Packaging for fingerprint sensors and methods of manufacture
US10043052B2 (en) 2011-10-27 2018-08-07 Synaptics Incorporated Electronic device packages and methods
US9195877B2 (en) 2011-12-23 2015-11-24 Synaptics Incorporated Methods and devices for capacitive image sensing
US9785299B2 (en) 2012-01-03 2017-10-10 Synaptics Incorporated Structures and manufacturing methods for glass covered electronic devices
US9697411B2 (en) 2012-03-27 2017-07-04 Synaptics Incorporated Biometric object sensor and method
US9251329B2 (en) 2012-03-27 2016-02-02 Synaptics Incorporated Button depress wakeup and wakeup strategy
US9137438B2 (en) 2012-03-27 2015-09-15 Synaptics Incorporated Biometric object sensor and method
US9268991B2 (en) 2012-03-27 2016-02-23 Synaptics Incorporated Method of and system for enrolling and matching biometric data
US9824200B2 (en) 2012-03-27 2017-11-21 Synaptics Incorporated Wakeup strategy using a biometric sensor
US9600709B2 (en) 2012-03-28 2017-03-21 Synaptics Incorporated Methods and systems for enrolling biometric data
US9152838B2 (en) 2012-03-29 2015-10-06 Synaptics Incorporated Fingerprint sensor packagings and methods
US9798917B2 (en) 2012-04-10 2017-10-24 Idex Asa Biometric sensing
US9665762B2 (en) 2013-01-11 2017-05-30 Synaptics Incorporated Tiered wakeup strategy
US20140354596A1 (en) * 2013-06-03 2014-12-04 Qualcomm Incorporated Display with peripherally configured ultrasonic biometric sensor
US9323393B2 (en) * 2013-06-03 2016-04-26 Qualcomm Incorporated Display with peripherally configured ultrasonic biometric sensor
US9262003B2 (en) 2013-11-04 2016-02-16 Qualcomm Incorporated Piezoelectric force sensing array
US10055629B2 (en) 2014-08-05 2018-08-21 Lg Innotek Co., Ltd. Fingerprint sensor and touch device including the same
US9952095B1 (en) 2014-09-29 2018-04-24 Apple Inc. Methods and systems for modulation and demodulation of optical signals
US9607203B1 (en) 2014-09-30 2017-03-28 Apple Inc. Biometric sensing device with discrete ultrasonic transducers
US9904836B2 (en) * 2014-09-30 2018-02-27 Apple Inc. Reducing edge effects within segmented acoustic imaging systems
US9747488B2 (en) 2014-09-30 2017-08-29 Apple Inc. Active sensing element for acoustic imaging systems
US9979955B1 (en) 2014-09-30 2018-05-22 Apple Inc. Calibration methods for near-field acoustic imaging systems
US9984271B1 (en) 2014-09-30 2018-05-29 Apple Inc. Ultrasonic fingerprint sensor in display bezel
US10061963B2 (en) 2014-09-30 2018-08-28 Apple Inc. Active sensing element for acoustic imaging systems
US9824254B1 (en) 2014-09-30 2017-11-21 Apple Inc. Biometric sensing device with discrete ultrasonic transducers
WO2018047878A1 (en) * 2016-09-06 2018-03-15 積水化学工業株式会社 Piezoelectric sensor

Also Published As

Publication number Publication date Type
US7236616B1 (en) 2007-06-26 grant
EP1207786B1 (en) 2009-10-07 grant
DE60043112D1 (en) 2009-11-19 grant
EP1207786A2 (en) 2002-05-29 application
WO2001010296A3 (en) 2001-10-11 application
WO2001010296A2 (en) 2001-02-15 application
JP2003506693A (en) 2003-02-18 application
JP4578041B2 (en) 2010-11-10 grant

Similar Documents

Publication Publication Date Title
US4526043A (en) Conformable tactile sensor
US6686546B2 (en) Static charge dissipation for an active circuit surface
US6346739B1 (en) Static charge dissipation pads for sensors
US5852670A (en) Fingerprint sensing apparatus with finger position indication
US6052475A (en) Fingerprint detector using ridge resistance sensing array
US20030123714A1 (en) Method and system for capturing fingerprints from multiple swipe images
US6191593B1 (en) Method for the non-invasive sensing of physical matter on the detection surface of a capacitive sensor
US20030091220A1 (en) Capacitive sensor device
US6501284B1 (en) Capacitive finger detection for fingerprint sensor
EP0786745A2 (en) Enhanced security fingerprint sensor package and related methods
US7113622B2 (en) Swipe imager with improved sensing control features
EP0791899A2 (en) Electric field fingerprint sensor apparatus and related methods
US20050220329A1 (en) Method of focusing a fingerprint image and a fingerprint sensing device
US5673041A (en) Reflective mode ultrasonic touch sensitive switch
US6088585A (en) Portable telecommunication device including a fingerprint sensor and related methods
US6700606B1 (en) Micromirror optical imager
US8204281B2 (en) System and method to remove artifacts from fingerprint sensor scans
US20110175703A1 (en) Electronic Imager Using an Impedance Sensor Grid Array Mounted on or about a Switch and Method of Making
US6317508B1 (en) Scanning capacitive semiconductor fingerprint detector
US6330145B1 (en) Apparatus and method for contacting a sensor conductive layer
US8421890B2 (en) Electronic imager using an impedance sensor grid array and method of making
US20090235750A1 (en) Capacitive Ultrasonic Sensors and Display Devices Using the Same
US20130181949A1 (en) Finger sensor having pixel sensing circuitry for coupling electrodes and pixel sensing traces and related methods
US5920640A (en) Fingerprint sensor and token reader and associated methods
US4394773A (en) Fingerprint sensor

Legal Events

Date Code Title Description
AS Assignment

Owner name: CROSS MATCH TECHNOLOGIES, INC., FLORIDA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SCOTT, WALTER G.;REEL/FRAME:019521/0561

Effective date: 20020206

AS Assignment

Owner name: SONAVATION, INC., FLORIDA

Free format text: CHANGE OF NAME;ASSIGNOR:AUTHORIZER TECHNOLOGIES, INC.;REEL/FRAME:021817/0880

Effective date: 20080411

Owner name: AUTHORIZER TECHNOLOGIES, INC., FLORIDA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:CROSS MATCH TECHNOLOGIES, INC.;REEL/FRAME:021817/0874

Effective date: 20071026

AS Assignment

Owner name: JOHNSON, COLLATERAL AGENT, THEODORE M., FLORIDA

Free format text: SECURITY AGREEMENT;ASSIGNOR:SONAVATION, INC.;REEL/FRAME:023409/0336

Effective date: 20081201

AS Assignment

Owner name: CROSS MATCH TECHNOLOGIES, INC., FLORIDA

Free format text: ASSIGNMENT OF SECURITY INTEREST;ASSIGNOR:SONAVATION, INC.;REEL/FRAME:025066/0580

Effective date: 20100920