Patents by Inventor Frank Riedijk
Frank Riedijk has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11935319Abstract: A method of evaluating a dielectric structure, comprising the steps of a) changing a potential difference between each sensing structure in a first set of sensing structures and each sensing structure in a second set of sensing structures, and to providing, for each sensing structure in the first set of sensing structures, a sensing signal indicative of a strength of a capacitive coupling between each sensing structure in the second set of sensing structures and the sensing structure in the first set of sensing structures; b) assign other sensing structures to the first set of sensing structures and the second set of sensing structures; c) performing step a) and step b) until a respective sensing signal has been provided for each sensing structure in the plurality of sensing structures; and d) providing an evaluation result based on the respective sensing signals.Type: GrantFiled: November 2, 2021Date of Patent: March 19, 2024Assignee: FINGERPRINT CARDS ANACATUM IP ABInventors: Frank Riedijk, Wouter Brevet, Hans Thörnblom, Anton Landberg
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Publication number: 20240028154Abstract: A fingerprint sensor comprising a plurality of sensing elements distributed across a rectangular sensing area with mutually opposite short sides and mutually opposite long sides, the sensing elements being arranged in a plurality of rows and a plurality of columns; readout circuitry arranged in a readout area located adjacent to a short side of the sensing area; and a plurality of readout lines for connecting each of the sensing elements to the readout circuitry, the readout lines in the plurality of readout lines extending in parallel to the long sides of the sensing area. For each column of sensing elements in the plurality of columns, at least a first sensing element and a second sensing element in the column are simultaneously connectable to the readout circuitry via a first readout line and a second readout line, respectively, in the plurality of readout lines.Type: ApplicationFiled: December 16, 2021Publication date: January 25, 2024Inventors: Frank Riedijk, Wouter Brevet, Hans Thörnblom
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Patent number: 11847854Abstract: A fingerprint sensing system for sensing a finger surface of a finger, comprising: a plurality of pixel elements, each pixel element in the plurality of pixel elements comprising: a photo-sensitive element configured to provide a current including a fingerprint signal current component and a common-mode signal current component; and an integrating capacitor including a first electrode coupled to the photo-sensitive element for receiving the current provided by the photo-sensitive element, and a second electrode; and a current source arrangement coupled to the first electrode of the integrating capacitor of each pixel element in the plurality of pixel elements.Type: GrantFiled: June 10, 2021Date of Patent: December 19, 2023Assignee: FINGERPRINT CARDS ANACATUM IP ABInventors: Andreas Larsson, Frank Riedijk
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Publication number: 20230375612Abstract: A method of evaluating a dielectric structure, comprising the steps of a) changing a potential difference between each sensing structure in a first set of sensing structures and each sensing structure in a second set of sensing structures, and to providing, for each sensing structure in the first set of sensing structures, a sensing signal indicative of a strength of a capacitive coupling between each sensing structure in the second set of sensing structures and the sensing structure in the first set of sensing structures; b) assign other sensing structures to the first set of sensing structures and the second set of sensing structures; c) performing step a) and step b) until a respective sensing signal has been provided for each sensing structure in the plurality of sensing structures; and d) providing an evaluation result based on the respective sensing signals.Type: ApplicationFiled: November 2, 2021Publication date: November 23, 2023Inventors: Frank Riedijk, Wouter Brevet, Hans Thörnblom, Anton Landberg
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Patent number: 11727711Abstract: A fingerprint sensing system for sensing a finger surface of a finger, comprising: an array of sensing elements arranged under a sensing surface, each sensing element in the array of sensing elements being configured to sense a property indicative of a distance between the sensing element and the finger surface; and read-out circuitry coupled to the array of sensing elements and configured to provide, for each sensing element in the array of sensing elements, a timing indication indicative of a time when a value of the property sensed by the sensing element reached a predefined threshold value.Type: GrantFiled: June 23, 2021Date of Patent: August 15, 2023Assignee: FINGERPRINT CARDS ANACATUM IP ABInventors: Hans Thörnblom, Daniel Andersson, Frank Riedijk, Johannes Arvidsson, Rasmus Söderström Olsson
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Publication number: 20230230410Abstract: A fingerprint sensing system for sensing a finger surface of a finger, comprising: an array of sensing elements arranged under a sensing surface, each sensing element in the array of sensing elements being configured to sense a property indicative of a distance between the sensing element and the finger surface; and read-out circuitry coupled to the array of sensing elements and configured to provide, for each sensing element in the array of sensing elements, a timing indication indicative of a time when a value of the property sensed by the sensing element reached a predefined threshold value.Type: ApplicationFiled: June 23, 2021Publication date: July 20, 2023Inventors: Hans Thörnblom, Daniel Andersson, Frank Riedijk, Johannes Arvidsson, Rasmus Söderström Olsson
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Publication number: 20230090292Abstract: A fingerprint sensing system for sensing a finger surface of a finger, comprising: a plurality of pixel elements, each pixel element in the plurality of pixel elements comprising: a photo-sensitive element configured to provide a current including a fingerprint signal current component and a common-mode signal current component; and an integrating capacitor including a first electrode coupled to the photo-sensitive element for receiving the current provided by the photo-sensitive element, and a second electrode; and a current source arrangement coupled to the first electrode of the integrating capacitor of each pixel element in the plurality of pixel elements.Type: ApplicationFiled: June 10, 2021Publication date: March 23, 2023Inventors: Andreas Larsson, Frank Riedijk
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Patent number: 11538267Abstract: A fingerprint sensor comprising a plurality of electrically conductive sensing structures arranged in a sensing plane for capacitively sensing a fingerprint of a finger placed on the finger receiving surface of the fingerprint sensor arrangement, the plurality of electrically conductive sensing structures including: a first set of electrically conductive sensing structures, each sensing structure in the first set of electrically conductive sensing structures covering an area in the sensing plane being within a first area range; and a second set of electrically conductive sensing structures, each sensing structure in the second set of electrically conductive sensing structures covering an area in the sensing plane being within a second area range only including areas greater than the areas within the first area range.Type: GrantFiled: September 7, 2021Date of Patent: December 27, 2022Assignee: FINGERPRINT CARDS ANACATUM IP ABInventors: Frank Riedijk, Wouter Brevet, Hans Thörnblom
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Patent number: 11501554Abstract: A fingerprint sensor comprising a plurality of electrically conductive sensing structures arranged in a sensing plane for capacitively sensing a fingerprint of a finger; and measurement circuitry coupled to the plurality of electrically conductive sensing structures for providing measurement signals indicative of a capacitive coupling between each sensing structure in the plurality of electrically conductive sensing structures and the finger, wherein the measurement circuitry is arranged to: provide, using a first measurement circuitry configuration, a first set of measurement signals from a first set of sensing structures; and provide, using a second measurement circuitry configuration different from the first measurement circuitry configuration, a second set of measurement signals from a second set of sensing structures.Type: GrantFiled: September 7, 2021Date of Patent: November 15, 2022Assignee: FINGERPRINT CARDS ANACATUM IP ABInventors: Frank Riedijk, David Carling, Hans Thörnblom, Wouter Brevet
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Patent number: 11482033Abstract: A method for controlling a plurality of ultrasonic transducers in a fingerprint sensing system that comprises a cover plate having a sensing surface configured to be touched by a finger, and a plurality of ultrasonic transducers located at the periphery of the cover plate and configured to transmit an acoustic signal propagating in the cover plate, receive an ultrasonic signal having interacted with an object in contact with the sensing surface, and to determine properties of the object based on the received ultrasonic signal. The method comprises: in response to a first input, controlling the plurality of transducers such that at least a portion of the sensing surface has a first feature detection resolution; and in response to a second input, controlling the plurality of transducers such that at least a portion of the sensing surface has a second feature detection resolution, different from the first feature detection resolution.Type: GrantFiled: October 23, 2018Date of Patent: October 25, 2022Assignee: FINGERPRINT CARDS ANACATUM IP ABInventors: Farzan Ghavanini, Jonas Tallhage, Frank Riedijk, René Nilsson, Wieslaw Bicz, Agnieszka Bicz
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Publication number: 20220075977Abstract: A fingerprint sensor comprising a plurality of electrically conductive sensing structures arranged in a sensing plane for capacitively sensing a fingerprint of a finger placed on the finger receiving surface of the fingerprint sensor arrangement, the plurality of electrically conductive sensing structures including: a first set of electrically conductive sensing structures, each sensing structure in the first set of electrically conductive sensing structures covering an area in the sensing plane being within a first area range; and a second set of electrically conductive sensing structures, each sensing structure in the second set of electrically conductive sensing structures covering an area in the sensing plane being within a second area range only including areas greater than the areas within the first area range.Type: ApplicationFiled: September 7, 2021Publication date: March 10, 2022Applicant: Fingerprint Cards ABInventors: Frank RIEDIJK, Wouter BREVET, Hans THÖRNBLOM
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Publication number: 20220075976Abstract: A fingerprint sensor comprising a plurality of electrically conductive sensing structures arranged in a sensing plane for capacitively sensing a fingerprint of a finger; and measurement circuitry coupled to the plurality of electrically conductive sensing structures for providing measurement signals indicative of a capacitive coupling between each sensing structure in the plurality of electrically conductive sensing structures and the finger, wherein the measurement circuitry is arranged to: provide, using a first measurement circuitry configuration, a first set of measurement signals from a first set of sensing structures; and provide, using a second measurement circuitry configuration different from the first measurement circuitry configuration, a second set of measurement signals from a second set of sensing structures.Type: ApplicationFiled: September 7, 2021Publication date: March 10, 2022Applicant: Fingerprint Cards ABInventors: Frank RIEDIJK, David CARLING, Hans THÖRNBLOM, Wouter BREVET
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Patent number: 11216633Abstract: The present invention relates to providing a filtered fingerprint pattern signal indicative of a fingerprint pattern with a fingerprint sensing device comprising an array of sensing elements for sensing the fingerprint pattern. Each sensing element is configured to provide a sensing signal indicative of a local fingerprint pattern feature. The method comprises: receiving analog sensing signals from each of a set of sensing elements comprising at least four sensing elements, filtering the set of sensing signals to provide a set of filtered output signals each comprising a linear combination of the set of sensing signals in which each sensing signal has a respective coefficient. The coefficients in each linear combination sum up to zero, and wherein the linear combinations are different from each other. The set of filtered output signals are converted to a filtered digital sensing signal indicative of the user's fingerprint pattern.Type: GrantFiled: March 4, 2019Date of Patent: January 4, 2022Assignee: FINGERPRINT CARDS ANACATUM IP ABInventors: Lars Christensen, Hans Thörnblom, Frank Riedijk, Søren Skovgaard Christensen
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Publication number: 20210357603Abstract: A method for controlling a plurality of ultrasonic transducers in a fingerprint sensing system that comprises a cover plate having a sensing surface configured to be touched by a finger, and a plurality of ultrasonic transducers located at the periphery of the cover plate and configured to transmit an acoustic signal propagating in the cover plate, receive an ultrasonic signal having interacted with an object in contact with the sensing surface, and to determine properties of the object based on the received ultrasonic signal. The method comprises: in response to a first input, controlling the plurality of transducers such that at least a portion of the sensing surface has a first feature detection resolution; and in response to a second input, controlling the plurality of transducers such that at least a portion of the sensing surface has a second feature detection resolution, different from the first feature detection resolution.Type: ApplicationFiled: October 23, 2018Publication date: November 18, 2021Applicant: FINGERPRINT CARDS ABInventors: Farzan GHAVANINI, Jonas TALLHAGE, Frank RIEDIJK, René NILSSON, Wieslaw BICZ, Agnieszka BICZ
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Patent number: 11093090Abstract: A fingerprint sensing system comprising a plurality of conductive selection lines; a plurality of conductive read-out lines crossing the selection lines; selection circuitry controllable to provide a selection signal on at least one selected selection line in the plurality of selection lines; a plurality of pixel elements formed at intersections between the selection lines and the read-out lines; a reference signal source configured to provide a reference signal; and read-out circuitry coupled to each read-out line in the plurality of read-out lines and to the reference signal source, the read-out circuitry being configured to acquire a read-out signal via a read-out line connected to a selected pixel element, when the selected pixel element provides the sensing signal; acquire a reference signal from the reference signal source; form a corrected read-out signal for the selected pixel element based on the read-out signal and the reference signal; and provide corrected read-out signals.Type: GrantFiled: August 3, 2020Date of Patent: August 17, 2021Assignee: Fingerprint Cards ABInventors: Andreas Larsson, Frank Riedijk
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Publication number: 20210173501Abstract: A fingerprint sensing system comprising a plurality of conductive selection lines; a plurality of conductive read-out lines crossing the selection lines; selection circuitry controllable to provide a selection signal on at least one selected selection line in the plurality of selection lines; a plurality of pixel elements formed at intersections between the selection lines and the read-out lines; a reference signal source configured to provide a reference signal; and read-out circuitry coupled to each read-out line in the plurality of read-out lines and to the reference signal source, the read-out circuitry being configured to acquire a read-out signal via a read-out line connected to a selected pixel element, when the selected pixel element provides the sensing signal; acquire a reference signal from the reference signal source; form a corrected read-out signal for the selected pixel element based on the read-out signal and the reference signal; and provide corrected read-out signals.Type: ApplicationFiled: August 3, 2020Publication date: June 10, 2021Applicant: Fingerprint Cards ABInventors: Andreas LARSSON, Frank RIEDIJK
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Publication number: 20200410191Abstract: The present invention relates to a fingerprint sensing arrangement and to a method for providing a fingerprint pattern signal. For providing the fingerprint pattern signal a sensing signals from the sensing circuits of at least two sensing elements are combined according to an arithmetic operation to form a combined sensing signal. The combined sensing signal is compared to a threshold value. Based on the comparison a binary value is output. The fingerprint pattern signal comprises at least one set of binary values.Type: ApplicationFiled: December 4, 2018Publication date: December 31, 2020Applicant: Fingerprint Cards ABInventors: Søren SKOVGAARD CHRISTENSEN, Hans THÖRNBLOM, Frank RIEDIJK
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Publication number: 20200401778Abstract: The present invention relates to providing a filtered fingerprint pattern signal indicative of a fingerprint pattern with a fingerprint sensing device comprising an array of sensing elements for sensing the fingerprint pattern. Each sensing element is configured to provide a sensing signal indicative of a local fingerprint pattern feature. The method comprises: receiving analog sensing signals from each of a set of sensing elements comprising at least four sensing elements, filtering the set of sensing signals to provide a set of filtered output signals each comprising a linear combination of the set of sensing signals in which each sensing signal has a respective coefficient. The coefficients in each linear combination sum up to zero, and wherein the linear combinations are different from each other. The set of filtered output signals are converted to a filtered digital sensing signal indicative of the user's fingerprint pattern.Type: ApplicationFiled: March 4, 2019Publication date: December 24, 2020Applicant: Fingerprint Cards ABInventors: Lars CHRISTENSEN, Hans THÖRNBLOM, Frank RIEDIJK, Søren Skovgaard CHRISTENSEN
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Patent number: 10482307Abstract: A fingerprint sensing system for sensing a fingerprint pattern of a finger, comprising: a sensor array including a plurality of electrically conductive sensing structures; read-out circuitry connected to each of the sensing structures for providing sensing signals indicative of a capacitive coupling between the sensing structures and the finger; first signal providing circuitry for providing a first time-varying voltage signal to at least a portion of the sensor array; at least one electrically conductive edge-compensating structure arranged outside the sensor array; and second signal providing circuitry for providing a second time-varying voltage signal to the at least one edge-compensating structure.Type: GrantFiled: September 25, 2018Date of Patent: November 19, 2019Assignee: Fingerprint Cards ABInventors: Frank Riedijk, Wouter Brevet
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Fingerprint sensing using measuring configurations with different principal directions of extensions
Patent number: 10474873Abstract: A method of determining a representation of a fingerprint pattern of a finger using a fingerprint sensor comprising a two-dimensional measuring arrangement including a plurality of measuring elements, each comprising a finger electrode spaced apart from the finger by a dielectric structure. For each measurement position, the method comprises the steps of: providing a first measuring element configuration with an elongated first measuring arrangement portion having a first principal direction of extension; and a first peripheral measuring arrangement portion; acquiring a first measurement value for the measurement position; providing a second measuring element configuration having an elongated second measuring arrangement portion having a second principal direction of extension; and a second peripheral measuring arrangement portion; and acquiring a second measurement value for the measurement position.Type: GrantFiled: November 8, 2017Date of Patent: November 12, 2019Assignee: Fingerprint Cards ABInventors: Frank Riedijk, Wouter Brevet, Hans Thörnblom, Christer Jansson