WO2006032884A1 - Systeme de commutateurs destine a la detection mecanique d'empreintes digitales - Google Patents

Systeme de commutateurs destine a la detection mecanique d'empreintes digitales Download PDF

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Publication number
WO2006032884A1
WO2006032884A1 PCT/GB2005/003640 GB2005003640W WO2006032884A1 WO 2006032884 A1 WO2006032884 A1 WO 2006032884A1 GB 2005003640 W GB2005003640 W GB 2005003640W WO 2006032884 A1 WO2006032884 A1 WO 2006032884A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact portion
conductors
contact
switch
gap
Prior art date
Application number
PCT/GB2005/003640
Other languages
English (en)
Other versions
WO2006032884A8 (fr
Inventor
William Leslie Ross
Original Assignee
Personal Biometric Encoders Limited
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
Priority claimed from GB0420958A external-priority patent/GB2418285A/en
Priority claimed from GB0420957A external-priority patent/GB2418284A/en
Priority claimed from GB0420956A external-priority patent/GB2418283A/en
Application filed by Personal Biometric Encoders Limited filed Critical Personal Biometric Encoders Limited
Publication of WO2006032884A1 publication Critical patent/WO2006032884A1/fr
Publication of WO2006032884A8 publication Critical patent/WO2006032884A8/fr

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
    • G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
    • G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
    • G06V40/12—Fingerprints or palmprints
    • G06V40/13—Sensors therefor
    • G06V40/1329—Protecting the fingerprint sensor against damage caused by the finger

Definitions

  • the present invention is concerned with a fingerprint sensor and a method of identity verification using a sensed fingerprint pattern.
  • Embodiments of the present invention are particularly concerned with an array of switches defining a digitiser including a matrix or array of individual sensing cells for sensing the presence or absence of an epidermal fingerprint ridge and thereby sensing fingerprint patterns.
  • Embodiments of the present invention are concerned with improvements to fingerprint sensors of the type described in EP 459,808, EP 699,325, GB 2,243,235, WO 98/11499 and Now 98/11500.
  • WO 98/11500 and WO 98/11499 describe digitisers defined by a matrix of sensing cells where each sensing cell is defined by a switch which can be closed in response to the presence of a fingerprint epidermal ridge.
  • a problem with the prior art systems is the possibility that current can sneak between adjacent sensing cells. This can distort the sensor output and restricts how close adjacent sensing cells can be.
  • the present invention in a first aspect provides a fingerprint sensor as set out in claim 1.
  • the present invention in a second aspect provides a fingerprint sensor as set out in claim 12.
  • the present invention in a third aspect provides a fingerprint sensor as set out in claim 14.
  • the present invention in a fourth aspect provides a method of verifying the identity of a person as set out in claim 16.
  • FIGS 1 and 2 are cross-sectional views through fingerprint sensors embodying the present invention
  • Figures 3 and 4 illustrate the sensing (ie upper) surface of the sensors of figures 1 and 2;
  • Figure 5 is an enlarged view of the contact pad of figure 3 illustrating the resistance of the current paths between the contact pad and its respective second conductor;
  • Figure 6 is an enlarged view of an alternative contact pad construction to that of figure 5;
  • FIGS 7 and 8 illustrate cross-sectional views through alternative fingerprint sensors embodying the present invention
  • Figures 9 and 10 illustrate the sensing (i.e. upper) surface of an alternative sensor construction
  • Figures 11a and 11b illustrates the relative resistance of the different current paths available from the contact pads of figures 7 to 10;
  • Figures 12 and 13 illustrate alternative contact pads suitable for the sensor construction of figures 7 to 10.
  • Figure 14 illustrates a comparison method embodying the present invention.
  • the present invention is concerned with digitisers comprising a matrix of individually actuable sensing cells 1.
  • the cells are defined by the cross-over points of two sets of parallel conductors 2,3.
  • a second set of parallel conductors 3 overlies and is separated from a first set of parallel conductors 2.
  • a conductive via 4 through the insulating material 5 separating the two sets of conductors 2,3 connects a lower conductor 2 with a contact pad 6 in the same plane as the second conductor 3 (or alternatively in an arrangement not illustrated, a second contact pad itself connected to the second conductor).
  • One set of conductors defines input or drive buses and the other set of conductors defines output or sensing buses.
  • the present invention is essentially only concerned with the shape of the contact pads, and how this relates to the conductor with which it is connected when the respective switch is closed.
  • the construction of digitisers embodying the present invention is in all other aspects identical to one or other of the constructions described in EP 459, 808, EP 699,325, GB 2, 43,235, WO 98/11499 and/or WO 98/11500.
  • the applicant therefore expressly incorporates the disclosure of these documents in this application and confirms that the described digitisers or fingerprint sensors are or may be constructed in one or other of the manners described in all of these publications.
  • each sensing cell 1 comprises a second conductor 3 overlying and separated from a first conductor 2 with the first conductor being connected to a contact pad 6.
  • a resiliency deformable membrane 7 including a continuously conductive film 8 of the type described in WO 98/11499 overlies the switch contacts defined by the contact pads 6 and second conductors 2.
  • Downward pressure on the conductive membrane 7 caused by, for example, pressure from an epidermal fingerprint ridge causes the film 8 to contact the second conductor 3 and contact pad 6 at a respective cell and thereby allows current to flow between the first and second conductors 2,3 (one of which defines an input bus and the other an output bus).
  • the contact pad 6 is a rectangular pad within the second conductor but separated therefrom by track or groove 9 of insulating material.
  • the contact pad arrangement is simple to make as it is simply a question of a different metal or conductor pattern on the devices surface.
  • the pattern is controlled in the known manner as described in, for example, EP 459,808, EP 699,325, GB 2243325, WO 98/11499 and/or WO 98/11500.
  • the inventor has appreciated that this results in a lower likelihood of sneak currents when one, for example, uses a continuously conductive membrane of the type described in WO 98/11499 to form the contact bridge for the array of switches making up the digitiser.
  • the resistance of a continuously conductive membrane of the type described in WO 98/11499 is defined as ohms per square .
  • the use of a contact pad 6 entirely surrounded by the second conductor 3 forming the other switch contact means that the effective resistance of the continuously conductive film 8 between the contact pad 6 and its respective conductor 3 can be made significantly lower than that between the contact pad and adjacent contact pads and/or conductors of adjacent sensing cells.
  • the resistance between the contact pad 6 and its respective second conductor 3 would be R/46 ohms per square as each square can be considered to be a resistance in parallel to the other squares.
  • the contact pad 6 is a circular or oval pad within the second conductor but separated therefrom by a track or groove 9 of insulating material.
  • the contact pads are rectangular.
  • the contact pad 6 is substantially triangular. The inventor has appreciated that this results in a lower likelihood of sneak currents when using a continuously conductive membrane of the type described in WO 98/11499 to form the contact bridge for the array of switches making up the digitiser.
  • the resistance of a continuously conductive membrane of the type described in WO 98/11499 is defined as ohms per square .
  • the use of a triangular contact pad 6 means that the effective resistance of the continuously conductive membrane between the contact pad and its respective conductor can be made significantly lower than that between the contact pad and adjacent contact pads and/or just conductors of adjacent sensing cells.
  • the contact pad is shaped either like a triangle (see figure 12) or like a squashed diamond (see figure 13) and is separated by a constant width gap from a respective second conductor having an indentation matching a side of the contact pad.
  • this arrangement results in a longer thinner gap between the contact pad and the respective seconf conductor and therefore results in a lower resistance because of the resistance of the connecting portion of the overlying membrane or bridge member being lower than that for a shorter fatter gap.
  • a fingerprint reader is coupled to a data processor including a comparator for a comparing fingerprint pattern sensed by the print reader with a fingerprint pattern stored in a memory.
  • the comparator When the sensed and stored patterns match, the comparator generates an acceptance signal indicating that the sensed pattern matches the stored pattern.
  • the acceptance signal may, for example, be used to authorise a financial transaction or open a door by releasing a lock.
  • the print reader may be of any of the known types of print reader.
  • the print reader or sensor may be as described in EP 459,808 or EP 1 ,021,785
  • the print reader generates a bit map or digital signal train representing an image of the sensed fingerprint.
  • the memory includes a stored bit or digital signal train representation, or image of a fingerprint pattern corresponding to, for example, an authorised person or user.
  • the comparator directly compares the bit map produced by the print reader or sensor with the bit map stored in the memory.

Landscapes

  • Engineering & Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Theoretical Computer Science (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Image Input (AREA)

Abstract

L'invention concerne un détecteur d'empreintes digitales défini par un réseau de commutateurs, chaque commutateur (1) présentant une première et une deuxième partie de contact (3, 6) séparées par un espace, et un élément de pontage défini par une section de film conducteur en continu destinée à connecter la première et la deuxième partie au travers de l'espace (9). Une des parties de contact est définie par une pastille de contact (6) et la longueur de l'espace dans la direction essentiellement parallèle aux bords adjacents de la première et de la deuxième partie de contact est supérieure à la largeur de l'espace entre la première et la deuxième partie de contact.
PCT/GB2005/003640 2004-09-21 2005-09-21 Systeme de commutateurs destine a la detection mecanique d'empreintes digitales WO2006032884A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
GB0420958.1 2004-09-21
GB0420958A GB2418285A (en) 2004-09-21 2004-09-21 Identity verification using bitmaps of complete fingerprint
GB0420957.3 2004-09-21
GB0420956.5 2004-09-21
GB0420957A GB2418284A (en) 2004-09-21 2004-09-21 Switch array having first electrode enclosed by second electrode
GB0420956A GB2418283A (en) 2004-09-21 2004-09-21 Array of switches having triangular electrodes

Publications (2)

Publication Number Publication Date
WO2006032884A1 true WO2006032884A1 (fr) 2006-03-30
WO2006032884A8 WO2006032884A8 (fr) 2006-05-04

Family

ID=35478677

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2005/003640 WO2006032884A1 (fr) 2004-09-21 2005-09-21 Systeme de commutateurs destine a la detection mecanique d'empreintes digitales

Country Status (1)

Country Link
WO (1) WO2006032884A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243235A (en) * 1990-04-20 1991-10-23 William Leslie Ross Fingerprint sensor
EP0459808A2 (fr) * 1990-05-31 1991-12-04 Personal Biometric Encoders Limited Convertisseur numérique
EP0566366A2 (fr) * 1992-04-15 1993-10-20 Wako Pure Chemical Industries Ltd Procédé de préparation de dérivés de maltooligosaccharides
EP0699325A1 (fr) * 1993-04-27 1996-03-06 Personal Biometric Encoders Limited Detecteur d'empreintes digitales
WO1998011500A1 (fr) * 1996-09-10 1998-03-19 Personal Biometric Encoders Ltd. Numeriseur d'empreintes digitales dote d'un substrat deformable
US6578436B1 (en) * 2000-05-16 2003-06-17 Fidelica Microsystems, Inc. Method and apparatus for pressure sensing

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2243235A (en) * 1990-04-20 1991-10-23 William Leslie Ross Fingerprint sensor
EP0459808A2 (fr) * 1990-05-31 1991-12-04 Personal Biometric Encoders Limited Convertisseur numérique
EP0566366A2 (fr) * 1992-04-15 1993-10-20 Wako Pure Chemical Industries Ltd Procédé de préparation de dérivés de maltooligosaccharides
EP0699325A1 (fr) * 1993-04-27 1996-03-06 Personal Biometric Encoders Limited Detecteur d'empreintes digitales
WO1998011500A1 (fr) * 1996-09-10 1998-03-19 Personal Biometric Encoders Ltd. Numeriseur d'empreintes digitales dote d'un substrat deformable
WO1998011499A1 (fr) * 1996-09-10 1998-03-19 Personal Biometric Encoders Ltd. Numeriseur d'empreintes digitales dote d'une membrane conductrice continue
US6578436B1 (en) * 2000-05-16 2003-06-17 Fidelica Microsystems, Inc. Method and apparatus for pressure sensing

Also Published As

Publication number Publication date
WO2006032884A8 (fr) 2006-05-04

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