Patents by Inventor John F. Filhaber
John F. Filhaber 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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Publication number: 20230236434Abstract: An illumination apparatus for reducing speckle effect in light reflected off an illumination target includes a laser; a linear diffuser positioned in an optical path between an illumination target and the laser to diffuse collimated laser light in a planar fan of diffused light that spreads in one dimension across at least a portion of the illumination target; and a beam deflector to direct the collimated laser light incident on the beam deflector to sweep across different locations on the linear diffuser within an exposure time for illumination of the illumination target by the diffused light. The different locations span a distance across the linear diffuser that provides sufficient uncorrelated speckle patterns, at an image sensor, in light reflected from an intersection of the planar fan of light with the illumination target to add incoherently when imaged by the image sensor within the exposure time.Type: ApplicationFiled: October 31, 2022Publication date: July 27, 2023Inventor: John F. Filhaber
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Patent number: 11598973Abstract: A system for forming a homogenized illumination line which can be imaged as a low-speckle line is disclosed. The system includes a laser configured to emit a collimated laser beam; and an illumination-fan generator that includes one or more linear diffusers. The illumination-fan generator is arranged and configured to (i) receive the collimated laser beam, (ii) output a planar fan of diffused light, such that the planar fan emanates from a light line formed on the distal-most one of the one or more linear diffusers, and (iii) cause formation of an illumination line at an intersection of the planar fan and an object.Type: GrantFiled: April 19, 2022Date of Patent: March 7, 2023Assignee: Cognex CorporationInventors: Andrew Parrett, John F. Filhaber, Andrew Goodale, Laurent Belanger, Ronald Zimmerman
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Patent number: 11563931Abstract: A calibration fixture that enables more accurate calibration of a touch probe on, for example, a CMM, with respect to the camera. The camera is mounted so that its optical axis is approximately or substantially parallel with the z-axis of the probe. The probe and workpiece are in relative motion, along a plane defined by orthogonal x and y axes, and optionally the z-axis and/or and rotation R about the z-axis. The calibration fixture is arranged to image from beneath the touch surface of the probe and, via a 180-degree prism structure, to transmit light from the probe touch point along the optical axis to the camera. Alternatively, two cameras respectively view the fiducial location relative to the CMM arm and the probe location when aligned on the fiducial. The fixture can define an integrated assembly with an optics block and a camera assembly.Type: GrantFiled: November 23, 2020Date of Patent: January 24, 2023Assignee: Cognex CorporationInventors: John F. Filhaber, Lowell D. Jacobson, George J. Costigan
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Patent number: 11493454Abstract: This invention provides a system and method for detecting and imaging specular surface defects on a specular surface that employs a knife-edge technique in which the camera aperture or an external device is set to form a physical knife-edge structure within the optical path that effectively blocks reflected rays from an illuminated specular surface of a predetermined degree of slope values and allows rays deflected at differing slopes to reach the vision system camera sensor. The light reflected from the flat part of the surface is mostly blocked by the knife-edge. Light reflecting from the sloped parts of the defects is mostly reflected into the entrance aperture. The illumination beam is angled with respect to the optical axis of the camera to provide the appropriate degree of incident angle with respect to the surface under inspection. The surface can be stationary or in relative motion with respect to the camera.Type: GrantFiled: November 11, 2016Date of Patent: November 8, 2022Assignee: Cognex CorporationInventors: Fariborz Rostami, John F. Filhaber, Feng Qian
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Patent number: 11487130Abstract: An illumination apparatus for reducing speckle effect in light reflected off an illumination target includes a laser; diffuser positioned in an optical path between an illumination target and the laser to diffuse collimated laser light in a planar fan of diffused light that spreads in one dimension across at least a portion of the illumination target; and a beam deflector to direct the collimated laser light incident on the beam deflector to sweep across different locations on the linear diffuser within an exposure time for illumination of the illumination target by the diffused light. The different locations span a distance across the linear diffuser that provides sufficient uncorrelated speckle patterns, at an image sensor, in light reflected from an intersection of the planar fan of light with the illumination target to add incoherently when imaged by the image sensor within the exposure time.Type: GrantFiled: January 19, 2018Date of Patent: November 1, 2022Assignee: Cognex CorporationInventor: John F. Filhaber
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Publication number: 20220236580Abstract: A system for forming a homogenized illumination line which can be imaged as a low-speckle line is disclosed. The system includes a laser configured to emit a collimated laser beam; and an illumination-fan generator that includes one or more linear diffusers. The illumination-fan generator is arranged and configured to (i) receive the collimated laser beam, (ii) output a planar fan of diffused light, such that the planar fan emanates from a light line formed on the distal-most one of the one or more linear diffusers, and (iii) cause formation of an illumination line at an intersection of the planar fan and an object.Type: ApplicationFiled: April 19, 2022Publication date: July 28, 2022Inventors: Andrew Parrett, John F. Filhaber, Andrew Goodale, Laurent Belanger, Ronald Zimmerman
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Publication number: 20220146848Abstract: A coherent beam moves across a stationary line generator, allowing the speckle pattern projected through the diffuser onto the surface—for example using a MEMS mirror, or another arrangement that is free of a moving mass, such as solid state beam deflector (e.g. an AOM). Where an image sensor is employed, such as a DS, the beam is moved at a speed of at least ½ cycle per image frame so that the full length of the line within the imaged scene is captured by the image sensor. The distance traversed on the diffuser provides sufficient uncorrelated speckle patterns within an exposure time to average to a smooth line. The MEMS mirror can be arranged to oscillate in two substantially orthogonal degrees of freedom so that the line is generated along a first direction and the line moves along the working surface in a second direction.Type: ApplicationFiled: June 14, 2021Publication date: May 12, 2022Inventor: John F. Filhaber
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Patent number: 11314100Abstract: A system for forming a homogenized illumination line which can be imaged as a low-speckle line is disclosed. The system includes a laser configured to emit a collimated laser beam; and an illumination-fan generator that includes one or more linear diffusers. The illumination-fan generator is arranged and configured to (i) receive the collimated laser beam, (ii) output a planar fan of diffused light, such that the planar fan emanates from a light line formed on the distal-most one of the one or more linear diffusers, and (iii) cause formation of an illumination line at an intersection of the planar fan and an object.Type: GrantFiled: January 18, 2019Date of Patent: April 26, 2022Assignee: Cognex CorporationInventors: Andrew Parrett, John F. Filhaber, Andrew Goodale, Laurent Belanger, Ronald Zimmerman
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Patent number: 11159784Abstract: A calibration fixture is provided that enables more accurate calibration of a touch probe on, for example, a coordinate measuring machine (CMM), with respect to the camera. The camera is mounted so that its optical axis is approximately or substantially parallel with the z-axis of the probe. The probe and workpiece are in relative motion, along a plane defined by orthogonal x and y axes, and optionally the z-axis and/or and rotation R about the z-axis. The calibration fixture is arranged to image from beneath the touch surface of the probe and, via a 180-degree prism structure, to transmit light from the probe touch point along the optical axis to the camera. Alternatively, two cameras respectively view the fiducial location relative to the CMM arm and the probe location when aligned on the fiducial. The fixture can define an integrated assembly with an optics block and a camera assembly.Type: GrantFiled: October 16, 2015Date of Patent: October 26, 2021Assignee: Cognex CorporationInventors: John F. Filhaber, Lowell D. Jacobson, George J. Costigan
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Patent number: 11036057Abstract: A coherent beam moves across a stationary line generator, allowing the speckle pattern projected through the diffuser onto the surface—for example using a MEMS mirror, or another arrangement that is free of a moving mass, such as solid state beam deflector (e.g. an AOM). Where an image sensor is employed, such as a DS, the beam is moved at a speed of at least ½ cycle per image frame so that the full length of the line within the imaged scene is captured by the image sensor. The distance traversed on the diffuser provides sufficient uncorrelated speckle patterns within an exposure time to average to a smooth line. The MEMS mirror can be arranged to oscillate in two substantially orthogonal degrees of freedom so that the line is generated along a first direction and the line moves along the working surface in a second direction.Type: GrantFiled: April 13, 2020Date of Patent: June 15, 2021Assignee: Cognex CorporationInventor: John F. Filhaber
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Publication number: 20210176456Abstract: This invention provides a calibration fixture that enables more accurate calibration of a touch probe on, for example, a CMM, with respect to the camera. The camera is mounted so that its optical axis is approximately or substantially parallel with the z-axis of the probe. The probe and workpiece are in relative motion, along a plane defined by orthogonal x and y axes, and optionally the z-axis and/or and rotation R about the z-axis. The calibration fixture is arranged to image from beneath the touch surface of the probe and, via a 180-degree prism structure, to transmit light from the probe touch point along the optical axis to the camera. Alternatively, two cameras respectively view the fiducial location relative to the CMM arm and the probe location when aligned on the fiducial. The fixture can define an integrated assembly with an optics block and a camera assembly.Type: ApplicationFiled: November 23, 2020Publication date: June 10, 2021Inventors: John F. Filhaber, Lowell D. Jacobson, George J. Costigan
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Publication number: 20210132403Abstract: An illumination apparatus for reducing speckle effect in light reflected off an illumination target (120) includes a laser (150); a linear diffuser (157) positioned in an optical path between an illumination target and the laser to diffuse collimated laser light (154) in a planar fan of diffused light (158, 159) that spreads in one dimension across at least a portion of the illumination target; and a beam deflector (153) to direct the collimated laser light incident on the beam deflector to sweep across different locations on the linear diffuser within an exposure time for illumination of the illumination target by the diffused light. The different locations span a distance across the linear diffuser that provides sufficient uncorrelated speckle patterns, at an image sensor (164), in light reflected from an intersection of the planar fan of light with the illumination target to add incoherently when imaged by the image sensor within the exposure time.Type: ApplicationFiled: January 19, 2018Publication date: May 6, 2021Inventor: John F. Filhaber
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Publication number: 20200341287Abstract: A coherent beam moves across a stationary line generator, allowing the speckle pattern projected through the diffuser onto the surface—for example using a MEMS mirror, or another arrangement that is free of a moving mass, such as solid state beam deflector (e.g. an AOM). Where an image sensor is employed, such as a DS, the beam is moved at a speed of at least ½ cycle per image frame so that the full length of the line within the imaged scene is captured by the image sensor. The distance traversed on the diffuser provides sufficient uncorrelated speckle patterns within an exposure time to average to a smooth line. The MEMS mirror can be arranged to oscillate in two substantially orthogonal degrees of freedom so that the line is generated along a first direction and the line moves along the working surface in a second direction.Type: ApplicationFiled: April 13, 2020Publication date: October 29, 2020Inventor: John F. Filhaber
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Patent number: 10620447Abstract: A coherent beam moves across a stationary line generator, allowing the speckle pattern projected through the diffuser onto the surface—for example using a MEMS mirror, or another arrangement that is free of a moving mass, such as solid state beam deflector (e.g. an AOM). Where an image sensor is employed, such as a DS, the beam is moved at a speed of at least ½ cycle per image frame so that the full length of the line within the imaged scene is captured by the image sensor. The distance traversed on the diffuser provides sufficient uncorrelated speckle patterns within an exposure time to average to a smooth line. The MEMS mirror can be arranged to oscillate in two substantially orthogonal degrees of freedom so that the line is generated along a first direction and the line moves along the working surface in a second direction.Type: GrantFiled: August 11, 2017Date of Patent: April 14, 2020Assignee: COGNEX CORPORATIONInventor: John F. Filhaber
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Publication number: 20190227336Abstract: A system for forming a homogenized illumination line which can be imaged as a low-speckle line is disclosed. The system includes a laser configured to emit a collimated laser beam; and an illumination-fan generator that includes one or more linear diffusers. The illumination-fan generator is arranged and configured to (i) receive the collimated laser beam, (ii) output a planar fan of diffused light, such that the planar fan emanates from a light line formed on the distal-most one of the one or more linear diffusers, and (iii) cause formation of an illumination line at an intersection of the planar fan and an object.Type: ApplicationFiled: January 18, 2019Publication date: July 25, 2019Inventors: Andrew Parrett, John F. Filhaber, Andrew Goodale, Laurent Belanger, Ronald Zimmerman
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Publication number: 20180203249Abstract: A coherent beam moves across a stationary line generator, allowing the speckle pattern projected through the diffuser onto the surface—for example using a MEMS mirror, or another arrangement that is free of a moving mass, such as solid state beam deflector (e.g. an AOM). Where an image sensor is employed, such as a DS, the beam is moved at a speed of at least ½ cycle per image frame so that the full length of the line within the imaged scene is captured by the image sensor. The distance traversed on the diffuser provides sufficient uncorrelated speckle patterns within an exposure time to average to a smooth line. The MEMS mirror can be arranged to oscillate in two substantially orthogonal degrees of freedom so that the line is generated along a first direction and the line moves along the working surface in a second direction.Type: ApplicationFiled: August 11, 2017Publication date: July 19, 2018Inventor: John F. Filhaber
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Publication number: 20170236266Abstract: This invention provides a system and method for detecting and imaging specular surface defects on a specular surface that employs a knife-edge technique in which the camera aperture or an external device is set to form a physical knife-edge structure within the optical path that effectively blocks reflected rays from an illuminated specular surface of a predetermined degree of slope values and allows rays deflected at differing slopes to reach the vision system camera sensor. The light reflected from the flat part of the surface is mostly blocked by the knife-edge. Light reflecting from the sloped parts of the defects is mostly reflected into the entrance aperture. The illumination beam is angled with respect to the optical axis of the camera to provide the appropriate degree of incident angle with respect to the surface under inspection. The surface can be stationary or in relative motion with respect to the camera.Type: ApplicationFiled: November 11, 2016Publication date: August 17, 2017Inventors: Fariborz Rostami, John F. Filhaber, Feng Qian
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Publication number: 20160191911Abstract: This invention provides a calibration fixture that enables more accurate calibration of a touch probe on, for example, a CMM, with respect to the camera. The camera is mounted so that its optical axis is approximately or substantially parallel with the z-axis of the probe. The probe and workpiece are in relative motion, along a plane defined by orthogonal x and y axes, and optionally the z-axis and/or and rotation R about the z-axis. The calibration fixture is arranged to image from beneath the touch surface of the probe and, via a 180-degree prism structure, to transmit light from the probe touch point along the optical axis to the camera. Alternatively, two cameras respectively view the fiducial location relative to the CMM arm and the probe location when aligned on the fiducial. The fixture can define an integrated assembly with an optics block and a camera assembly.Type: ApplicationFiled: October 16, 2015Publication date: June 30, 2016Inventors: John F. Filhaber, Lowell D. Jacobson, George J. Costigan
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Patent number: 6836602Abstract: Methods of bonding optical components are disclosed. Bonding is achieved without use of adhesives or high temperature fusion. The invention is useful for bonding optical fibers together and for bonding optical fiber arrays to lens arrays.Type: GrantFiled: October 26, 2001Date of Patent: December 28, 2004Assignee: Corning IncorporatedInventors: John F. Filhaber, Clarence E. Ford, Jr., Robert Sabia, Jackson P. Trentelman
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Publication number: 20040226910Abstract: Methods of forming bulk optical elements, such as prisms, incorporating gratings are disclosed. Grating structures are formed by etching a uniform-thickness or generally planar substrate. Direct bonding, particularly chemical bonding, is then employed to bond the etched planar substrate to a bulk optical material without the use of adhesives or high temperature fusion.Type: ApplicationFiled: December 29, 2003Publication date: November 18, 2004Inventors: Dilip K. Chatterjee, John F. Filhaber, John R. Marciante, Jeff Hirsh, Larry Mann, Daniel H. Raguln, Robert Sabia, Dennis W. Smith, Tony L. Whitman