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).
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Patent number: 10474249Abstract: 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: GrantFiled: June 14, 2018Date of Patent: November 12, 2019Assignee: FlatFrog Laboratories ABInventors: Christer Fahraeus, Henrik Wall, Ola Wassvik, Tomas Christiansson
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Publication number: 20190094990Abstract: 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: ApplicationFiled: June 14, 2018Publication date: March 28, 2019Inventors: Christer FAHRAEUS, Henrik WALL, Ola WASSVIK, Tomas CHRISTIANSSON
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Publication number: 20190025977Abstract: 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: ApplicationFiled: June 13, 2018Publication date: January 24, 2019Inventors: Tomas CHRISTIANSSON, Ola WASSVIK, Christer FAHRAEUS
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Patent number: 10048773Abstract: 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: GrantFiled: August 23, 2016Date of Patent: August 14, 2018Assignee: FlatFrog Laboratories ABInventors: Christer Fahraeus, Henrik Wall, Ola Wassvik, Tomas Christiansson
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Patent number: 10013107Abstract: 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: GrantFiled: June 26, 2017Date of Patent: July 3, 2018Assignee: FlatFrog Laboratories ABInventors: Tomas Christiansson, Ola Wassvik, Christer Fahraeus
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Patent number: 9857917Abstract: 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: GrantFiled: November 24, 2014Date of Patent: January 2, 2018Assignee: FLATFROG LABORATORIES ABInventors: Ola Wassvik, Hakan Bergstrom, Thomas Craven-Bartle, Christer Fahraeus
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Publication number: 20170293392Abstract: 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: ApplicationFiled: June 26, 2017Publication date: October 12, 2017Applicant: FlatFrog Laboratories ABInventors: Tomas CHRISTIANSSON, Ola WASSVIK, Christer FAHRAEUS
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Patent number: 9710101Abstract: 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: GrantFiled: October 13, 2015Date of Patent: July 18, 2017Assignee: Flatfrog Laboratories ABInventors: Tomas Christiansson, Ola Wassvik, Christer Fåhraeus
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Publication number: 20170010688Abstract: 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: ApplicationFiled: August 23, 2016Publication date: January 12, 2017Applicant: Flatfrog Laboratories ABInventors: Christer FAHRAEUS, Henrik WALL, Ola WASSVIK, Tomas CHRISTIANSSON
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Patent number: 9442574Abstract: 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: GrantFiled: October 11, 2013Date of Patent: September 13, 2016Assignee: FLATFROG LABORATORIES ABInventors: Christer Fåhraeus, Henrik Wall, Ola Wassvik, Tomas Christiansson
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Patent number: 9304605Abstract: 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: GrantFiled: December 15, 2008Date of Patent: April 5, 2016Assignee: Anoto ABInventors: Linus Wiebe, Christer Fåhraeus, Petter Ericson
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Publication number: 20160050746Abstract: 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: ApplicationFiled: April 9, 2014Publication date: February 18, 2016Inventors: Ola Wassvik, Christer Fåhraeus
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Publication number: 20160034099Abstract: 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: ApplicationFiled: October 13, 2015Publication date: February 4, 2016Inventors: Tomas CHRISTIANSSON, Ola WASSVIK, Christer FÅHRAEUS
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Publication number: 20160026337Abstract: 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: ApplicationFiled: November 24, 2014Publication date: January 28, 2016Inventors: Ola WASSVIK, Hakan BERGSTROM, Thomas CRAVEN-BARTLE, Christer FAHRAEUS
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Publication number: 20150331545Abstract: 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: ApplicationFiled: December 17, 2013Publication date: November 19, 2015Applicant: FlatFrog Laboraties ABInventors: Ola WASSVIK, Håkan BERGSTRÖM, Thomas CRAVEN-BARTLE, Christer FÅHRAEUS
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Publication number: 20150324028Abstract: 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: ApplicationFiled: December 17, 2013Publication date: November 12, 2015Inventors: Ola WASSVIK, Håkan BERGSTRÖM, Thomas CRAVEN-BARTLE, Christer FÅHRAEUS
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Patent number: 9158401Abstract: 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: GrantFiled: June 29, 2011Date of Patent: October 13, 2015Assignee: FLATFROG LABORATORIES ABInventors: Tomas Christiansson, Christer Fåhraeus, Ola Wassvik
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Publication number: 20140125633Abstract: 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: ApplicationFiled: October 11, 2013Publication date: May 8, 2014Applicant: FlatFrog Laboratories ABInventors: Christer FÅHRAEUS, Henrik WALL, Ola WASSVIK, Tomas CHRISTIANSSON
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Patent number: 8581884Abstract: 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: GrantFiled: December 2, 2009Date of Patent: November 12, 2013Assignee: FlatFrog Laboratories ABInventors: Christer Fåhraeus, Henrik Wall, Ola Wassvik, Tomas Christiansson
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Publication number: 20130154983Abstract: 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: ApplicationFiled: June 29, 2011Publication date: June 20, 2013Applicant: FlatFrog Laboratories ABInventors: Tomas Christiansson, Christer Fåhraeus, Ola Wassvik