Patents by Inventor Christer Fahraeus

Christer Fahraeus 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).

  • Publication number: 20190094990
    Abstract: A touch sensing apparatus includes a group of emitters arranged to emit light to illuminate at least part of the touch surface, a light detector arranged to receive light from the group of emitters, and a processing element. Each emitter is controlled to transmit a code by way of the emitted light such that the code identifies the respective emitter. The codes may at least partly be transmitted concurrently. The codes may be selected such that a value of an autocorrelation of each code is significantly higher than a value of a cross-correlation between any two codes of different emitters. The processing element processes an output signal from the light detector to separate the light received from the individual emitters based on the transmitted codes, and to determine the position of the object/objects based on the light received from the individual emitters.
    Type: Application
    Filed: June 14, 2018
    Publication date: March 28, 2019
    Inventors: Christer FAHRAEUS, Henrik WALL, Ola WASSVIK, Tomas CHRISTIANSSON
  • Publication number: 20190025977
    Abstract: A device obtains a signal representative of objects on a touch surface of a multi-touch sensing apparatus and executes a method for extracting touch data from the signal. The method operates in a sequence of detection frames. Each detection frame comprises the steps of: obtaining (300) the signal; processing (301) the signal for identifying touches; determining (302) a set of identified touches and touch data for the set of identified touches; and outputting (303) the touch data. At least one of the steps of processing (301) and determining (302) includes a prioritization that actively favors certain touches to be identified and included in the set of identified touches, respectively. Temporal prioritization favors a touch that corresponds to a previous touch, which is identified in one or more preceding detection frames. Spatial prioritization favors a touch that is located within at least one predefined subarea on the touch surface.
    Type: Application
    Filed: June 13, 2018
    Publication date: January 24, 2019
    Inventors: Tomas CHRISTIANSSON, Ola WASSVIK, Christer FAHRAEUS
  • Patent number: 10048773
    Abstract: A touch sensing apparatus includes a group of emitters arranged to emit light to illuminate at least part of the touch surface, a light detector arranged to receive light from the group of emitters, and a processing element. Each emitter is controlled to transmit a code by way of the emitted light such that the code identifies the respective emitter. The codes may at least partly be transmitted concurrently. The codes may be selected such that a value of an autocorrelation of each code is significantly higher than a value of a cross-correlation between any two codes of different emitters. The processing element processes an output signal from the light detector to separate the light received from the individual emitters based on the transmitted codes, and to determine the position of the object/objects based on the light received from the individual emitters.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: August 14, 2018
    Assignee: FlatFrog Laboratories AB
    Inventors: Christer Fahraeus, Henrik Wall, Ola Wassvik, Tomas Christiansson
  • Patent number: 10013107
    Abstract: A device obtains a signal representative of objects on a touch surface of a multi-touch sensing apparatus and executes a method for extracting touch data from the signal. The method operates in a sequence of detection frames. Each detection frame comprises the steps of: obtaining the signal; processing the signal for identifying touches; determining a set of identified touches and touch data for the set of identified touches; and outputting the touch data. At least one of the steps of processing and determining includes a prioritization that actively favors certain touches to be identified and included in the set of identified touches, respectively.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: July 3, 2018
    Assignee: FlatFrog Laboratories AB
    Inventors: Tomas Christiansson, Ola Wassvik, Christer Fahraeus
  • Patent number: 9857917
    Abstract: A touch-sensitive apparatus operates by light frustration (FTIR) and comprises a light transmissive panel (1) with a front surface and a rear surface. Light emitters (2) and light detectors (3) optically face the rear surface along a perimeter of a touch-sensitive region (4) on the panel (1). At least one diffusively reflecting element (40) is arranged on the front surface (5) along the perimeter of the touch-sensitive region (4). The light emitters (2) are arranged to emit a respective beam of light onto the diffusively reflecting element (40), so as to generate propagating light that propagates by total internal reflection inside the panel (1) across the touch-sensitive region (4), and the light detectors (3) are arranged to receive detection light generated as the propagating light impinges on the diffusively reflecting element (40), so as to define a grid of propagation paths (D) across the touch-sensitive region (4) between pairs of light emitters (2) and light detectors (3).
    Type: Grant
    Filed: November 24, 2014
    Date of Patent: January 2, 2018
    Assignee: FLATFROG LABORATORIES AB
    Inventors: Ola Wassvik, Hakan Bergstrom, Thomas Craven-Bartle, Christer Fahraeus
  • Publication number: 20170293392
    Abstract: A device obtains a signal representative of objects on a touch surface of a multi-touch sensing apparatus and executes a method for extracting touch data from the signal. The method operates in a sequence of detection frames. Each detection frame comprises the steps of: obtaining the signal; processing the signal for identifying touches; determining a set of identified touches and touch data for the set of identified touches; and outputting the touch data. At least one of the steps of processing and determining includes a prioritization that actively favors certain touches to be identified and included in the set of identified touches, respectively.
    Type: Application
    Filed: June 26, 2017
    Publication date: October 12, 2017
    Applicant: FlatFrog Laboratories AB
    Inventors: Tomas CHRISTIANSSON, Ola WASSVIK, Christer FAHRAEUS
  • Patent number: 9710101
    Abstract: A device obtains a signal representative of objects on a touch surface of a multi-touch sensing apparatus and executes a method for extracting touch data from the signal. The method operates in a sequence of detection frames. Each detection frame comprises the steps of: obtaining (300) the signal; processing (301) the signal for identifying touches; determining (302) a set of identified touches and touch data for the set of identified touches; and outputting (303) the touch data. At least one of the steps of processing (301) and determining (302) includes a prioritization that actively favors certain touches to be identified and included in the set of identified touches, respectively. Temporal prioritization favors a touch that corresponds to a previous touch, which is identified in one or more preceding detection frames. Spatial prioritization favors a touch that is located within at least one predefined subarea on the touch surface.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: July 18, 2017
    Assignee: Flatfrog Laboratories AB
    Inventors: Tomas Christiansson, Ola Wassvik, Christer Fåhraeus
  • Publication number: 20170010688
    Abstract: A touch sensing apparatus includes a group of emitters arranged to emit light to illuminate at least part of the touch surface, a light detector arranged to receive light from the group of emitters, and a processing element. Each emitter is controlled to transmit a code by way of the emitted light such that the code identifies the respective emitter. The codes may at least partly be transmitted concurrently. The codes may be selected such that a value of an autocorrelation of each code is significantly higher than a value of a cross-correlation between any two codes of different emitters. The processing element processes an output signal from the light detector to separate the light received from the individual emitters based on the transmitted codes, and to determine the position of the object/objects based on the light received from the individual emitters.
    Type: Application
    Filed: August 23, 2016
    Publication date: January 12, 2017
    Applicant: Flatfrog Laboratories AB
    Inventors: Christer FAHRAEUS, Henrik WALL, Ola WASSVIK, Tomas CHRISTIANSSON
  • Patent number: 9442574
    Abstract: A touch sensing apparatus includes a group of emitters arranged to emit light to illuminate at least part of the touch surface, a light detector arranged to receive light from the group of emitters, and a processing element. Each emitter is controlled to transmit a code by way of the emitted light such that the code identifies the respective emitter. The codes may at least partly be transmitted concurrently. The codes may be selected such that a value of an autocorrelation of each code is significantly higher than a value of a cross-correlation between any two codes of different emitters. The processing element processes an output signal from the light detector to separate the light received from the individual emitters based on the transmitted codes, and to determine the position of the object/objects based on the light received from the individual emitters.
    Type: Grant
    Filed: October 11, 2013
    Date of Patent: September 13, 2016
    Assignee: FLATFROG LABORATORIES AB
    Inventors: Christer Fåhraeus, Henrik Wall, Ola Wassvik, Tomas Christiansson
  • Patent number: 9304605
    Abstract: An information management system is intended for management of digitally represented information which is associated with absolute positions on an imaginary surface (200). The imaginary surface (200) contains at least two regions (201-208), each of which is dedicated to predetermined management of the digitally represented information. In the system the management of the digitally represented information is carried out on the basis of the region affiliation of the absolute positions associated with the information. The system is suitably based on use of a position-coding pattern which defines the imaginary surface (200) and which in parts is applicable on different bases. The system makes possible both digital recording of information and control of how the information thus recorded is to be managed. A database, a method for management of information, a method for compiling a pattern layout, a product and use are also described.
    Type: Grant
    Filed: December 15, 2008
    Date of Patent: April 5, 2016
    Assignee: Anoto AB
    Inventors: Linus Wiebe, Christer Fåhraeus, Petter Ericson
  • Publication number: 20160050746
    Abstract: The disclosure relates to a printed circuit assembly, PCA, comprising: a printed circuit board, PCB; a group of components comprising an emitter, a detector and an integrated circuit, IC wherein the components are electrically bonded to the PCB, and the emitter and the detector are electrically connected to the integrated circuit via the PCB, the integrated circuit is further configured to control operation of the emitter and the detector in the same group, and a first coating covering at least one of the components in the group, wherein the first coating is made of an optically transparent material. The disclosure also relates to a method for fabricating a printed circuit assembly, and a touch sensitive system comprising the printed circuit assembly.
    Type: Application
    Filed: April 9, 2014
    Publication date: February 18, 2016
    Inventors: Ola Wassvik, Christer Fåhraeus
  • Publication number: 20160034099
    Abstract: A device obtains a signal representative of objects on a touch surface of a multi-touch sensing apparatus and executes a method for extracting touch data from the signal. The method operates in a sequence of detection frames. Each detection frame comprises the steps of: obtaining (300) the signal; processing (301) the signal for identifying touches; determining (302) a set of identified touches and touch data for the set of identified touches; and outputting (303) the touch data. At least one of the steps of processing (301) and determining (302) includes a prioritization that actively favors certain touches to be identified and included in the set of identified touches, respectively. Temporal prioritization favors a touch that corresponds to a previous touch, which is identified in one or more preceding detection frames. Spatial prioritization favors a touch that is located within at least one predefined subarea on the touch surface.
    Type: Application
    Filed: October 13, 2015
    Publication date: February 4, 2016
    Inventors: Tomas CHRISTIANSSON, Ola WASSVIK, Christer FÅHRAEUS
  • Publication number: 20160026337
    Abstract: A touch-sensitive apparatus operates by light frustration (FTIR) and comprises a light transmissive panel (1) with a front surface and a rear surface. Light emitters (2) and light detectors (3) optically face the rear surface along a perimeter of a touch-sensitive region (4) on the panel (1). At least one diffusively reflecting element (40) is arranged on the front surface (5) along the perimeter of the touch-sensitive region (4). The light emitters (2) are arranged to emit a respective beam of light onto the diffusively reflecting element (40), so as to generate propagating light that propagates by total internal reflection inside the panel (1) across the touch-sensitive region (4), and the light detectors (3) are arranged to receive detection light generated as the propagating light impinges on the diffusively reflecting element (40), so as to define a grid of propagation paths (D) across the touch-sensitive region (4) between pairs of light emitters (2) and light detectors (3).
    Type: Application
    Filed: November 24, 2014
    Publication date: January 28, 2016
    Inventors: Ola WASSVIK, Hakan BERGSTROM, Thomas CRAVEN-BARTLE, Christer FAHRAEUS
  • Publication number: 20150331545
    Abstract: A laminated optical element is provided for a touch-sensitive apparatus which operates by light frustration (FTIR), and comprises: a light-transmissive panel (1) that defines a front surface (5) and an opposite, rear surface (6); a light-coupling mechanism for light input to and output from the panel, arranged along a perimeter of a touch-sensitive region (4) of the optical element; a shielding element (70) applied at the front surface (5) over the light-coupling mechanism; and a light-transmissive sheet (60) disposed overlapping the shielding element and covering the front surface of the panel within the shielding element, wherein a lower surface of the light-transmissive sheet is in optical contact with the front surface of the panel, so as to allow light within a predetermined wavelength range to propagate between at least first and second positions of the light-coupling mechanism by total internal reflection in an upper surface of the light-transmissive sheet.
    Type: Application
    Filed: December 17, 2013
    Publication date: November 19, 2015
    Applicant: FlatFrog Laboraties AB
    Inventors: Ola WASSVIK, Håkan BERGSTRÖM, Thomas CRAVEN-BARTLE, Christer FÅHRAEUS
  • Publication number: 20150324028
    Abstract: A touch-sensitive apparatus operates by light frustration (FTIR) and comprises a light transmissive panel (1) with a front surface (5) and a rear surface (6). Light emitters (2) and light detectors are optically coupled to the panel (1) to define a grid of light propagation paths inside the panel (1) between pairs of light emitters (2) and light detectors. A light in coupling structure comprises a diffusively reflective element (20) on the rear surface (6) and a specularly reflective element (22) on the front surface (5). Each light emitter (2) is arranged to project a beam of light onto a transmissive surface portion (24) on the rear surface (6), such that at least a portion of the beam of light enters the light transmissive panel (1) through the transmissive surface portion (24), is specularly reflected against the specularly reflective element (22) and impinges on the diffusively reflective element (20) from inside the light transmissive panel (1).
    Type: Application
    Filed: December 17, 2013
    Publication date: November 12, 2015
    Inventors: Ola WASSVIK, Håkan BERGSTRÖM, Thomas CRAVEN-BARTLE, Christer FÅHRAEUS
  • Patent number: 9158401
    Abstract: A device obtains a signal representative of objects on a touch surface of a multi-touch sensing apparatus and executes a method for extracting touch data from the signal. The method operates in a sequence of detection frames. Each detection frame comprises the steps of: obtaining (300) the signal; processing (301) the signal for identifying touches; determining (302) a set of identified touches and touch data for the set of identified touches; and outputting (303) the touch data. At least one of the steps of processing (301) and determining (302) includes a prioritization that actively favors certain touches to be identified and included in the set of identified touches, respectively. Temporal prioritization favors a touch that corresponds to a previous touch, which is identified in one or more preceding detection frames. Spatial prioritization favors a touch that is located within at least one predefined subarea on the touch surface.
    Type: Grant
    Filed: June 29, 2011
    Date of Patent: October 13, 2015
    Assignee: FLATFROG LABORATORIES AB
    Inventors: Tomas Christiansson, Christer Fåhraeus, Ola Wassvik
  • Publication number: 20140125633
    Abstract: A touch sensing apparatus includes a group of emitters arranged to emit light to illuminate at least part of the touch surface, a light detector arranged to receive light from the group of emitters, and a processing element. Each emitter is controlled to transmit a code by way of the emitted light such that the code identifies the respective emitter. The codes may at least partly be transmitted concurrently. The codes may be selected such that a value of an autocorrelation of each code is significantly higher than a value of a cross-correlation between any two codes of different emitters. The processing element processes an output signal from the light detector to separate the light received from the individual emitters based on the transmitted codes, and to determine the position of the object/objects based on the light received from the individual emitters.
    Type: Application
    Filed: October 11, 2013
    Publication date: May 8, 2014
    Applicant: FlatFrog Laboratories AB
    Inventors: Christer FÅHRAEUS, Henrik WALL, Ola WASSVIK, Tomas CHRISTIANSSON
  • Patent number: 8581884
    Abstract: A touch sensing apparatus is controlled to determine the position of one or more objects (7) that interact with a touch surface (1). The apparatus includes a group of emitters (2) arranged to emit light to illuminate at least part of the touch surface (1), a light detector (4) arranged to receive light from the group of emitters (2), and a processing element (7). Each emitter (2) is controlled to transmit a code by way of the emitted light such that the code identifies the respective emitter (2). The codes may at least partly be transmitted concurrently. The codes may be selected such that a value of an autocorrelation of each code is significantly higher than a value of a cross-correlation between any two codes of different emitters (2).
    Type: Grant
    Filed: December 2, 2009
    Date of Patent: November 12, 2013
    Assignee: FlatFrog Laboratories AB
    Inventors: Christer Fåhraeus, Henrik Wall, Ola Wassvik, Tomas Christiansson
  • Publication number: 20130154983
    Abstract: A device obtains a signal representative of objects on a touch surface of a multi-touch sensing apparatus and executes a method for extracting touch data from the signal. The method operates in a sequence of detection frames. Each detection frame comprises the steps of: obtaining (300) the signal; processing (301) the signal for identifying touches; determining (302) a set of identified touches and touch data for the set of identified touches; and outputting (303) the touch data. At least one of the steps of processing (301) and determining (302) includes a prioritization that actively favors certain touches to be identified and included in the set of identified touches, respectively. Temporal prioritization favors a touch that corresponds to a previous touch, which is identified in one or more preceding detection frames. Spatial prioritization favors a touch that is located within at least one predefined subarea on the touch surface.
    Type: Application
    Filed: June 29, 2011
    Publication date: June 20, 2013
    Applicant: FlatFrog Laboratories AB
    Inventors: Tomas Christiansson, Christer Fåhraeus, Ola Wassvik
  • Publication number: 20120256882
    Abstract: A device is configured to process data from a touch-sensitive apparatus for the purpose of identifying a reduced performance of components in the apparatus. The apparatus may be an FTIR system that comprises a light transmissive panel, an illumination arrangement for introducing light into the panel, and a light detection arrangement for receiving the light propagating in the panel and for measuring the energy of the received light. The device comprises a processor unit which is configured to obtain a signal comprising a time series of signal values that represent the energy of the light received by the light detection arrangement; calculate a parameter value representing a temporal variability of the signal values in the signal; and identify, based on the parameter value, a reduced performance of any of the illumination arrangement and the light detection arrangement.
    Type: Application
    Filed: December 20, 2010
    Publication date: October 11, 2012
    Applicant: FlatFrog Laboratories AB
    Inventors: Tomas Christiansson, Christer Fåhraeus, Ola Wassvik