Patents by Inventor David J. W. Aastuen

David J. W. Aastuen 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).

  • Patent number: 10670873
    Abstract: Projection subsystems are described. More, particularly, projection subsystems that include a light source and a polarizing beam splitter are described. The polarizing beam splitters of the presently described projection subsystems are capable of avoiding performance degradation even after exposure to large doses of incident light.
    Type: Grant
    Filed: March 19, 2018
    Date of Patent: June 2, 2020
    Assignee: 3M Innovative Properties Company
    Inventors: Stephen J. Willett, Craig R. Schardt, David J. W. Aastuen
  • Publication number: 20180210221
    Abstract: Projection subsystems are described. More, particularly, projection subsystems that include a light source and a polarizing beam splitter are described. The polarizing beam splitters of the presently described projection subsystems are capable of avoiding performance degradation even after exposure to large doses of incident light.
    Type: Application
    Filed: March 19, 2018
    Publication date: July 26, 2018
    Inventors: Stephen J. Willett, Craig R. Schardt, David J.W. Aastuen
  • Patent number: 9952443
    Abstract: Projection subsystems are described. More, particularly, projection subsystems that include a light source and a polarizing beam splitter are described. The polarizing beam splitters of the presently described projection subsystems are capable of avoiding performance degradation even after exposure to large doses of incident light.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: April 24, 2018
    Assignee: 3M Innovative Properties Company
    Inventors: Stephen J. Willett, Craig R. Schardt, David J. W. Aastuen
  • Publication number: 20170052383
    Abstract: Projection subsystems are described. More, particularly, projection subsystems that include a light source and a polarizing beam splitter are described. The polarizing beam splitters of the presently described projection subsystems are capable of avoiding performance degradation even after exposure to large doses of incident light.
    Type: Application
    Filed: November 9, 2016
    Publication date: February 23, 2017
    Inventors: Stephen J. Willett, Craig R. Schardt, David J.W. Aastuen
  • Patent number: 9525855
    Abstract: Projection subsystems are described. More, particularly, projection subsystems that include a light source and a polarizing beam splitter are described. The polarizing beam splitters of the presently described projection subsystems are capable of avoiding performance degradation even after exposure to large doses of incident light.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: December 20, 2016
    Assignee: 3M Innovative Properties Company
    Inventors: Stephen J. Willett, Craig R. Schardt, David J. W. Aastuen
  • Patent number: 8757858
    Abstract: In one embodiment, the invention provides backlight comprising a front reflector (102) and a back reflector (104) disposed to form a hollow light cavity (106) with a first light source (108) proximate one end of the front reflector (102) and having a tilt angle (110) of from 5° to 90°, and a first asymmetric light collimator (116) extending between at least the first light source (108) and the back reflector (104) for directing light from the first light source (108) into the hollow light cavity (106).
    Type: Grant
    Filed: June 1, 2009
    Date of Patent: June 24, 2014
    Assignee: 3M Innovative Properties Company
    Inventors: David J. W. Aastuen, Kenneth A. Epstein, Byung-Soo Ko, John A. Wheatley
  • Publication number: 20130044293
    Abstract: Projection subsystems are described. More, particularly, projection subsystems that include a light source and a polarizing beam splitter are described. The polarizing beam splitters of the presently described projection subsystems are capable of avoiding performance degradation even after exposure to large doses of incident light.
    Type: Application
    Filed: August 14, 2012
    Publication date: February 21, 2013
    Inventors: Stephen J. Willett, Craig R. Schardt, David J.W. Aastuen
  • Patent number: 8100535
    Abstract: An optical system is provided. The optical system comprises a first polarizing beamsplitter (PBS), a first reflecting image-forming device, and a first quarter-wave retarding element. An optical system is also provided that comprises an image-forming device, a reflective polarizing layer, at least a first birefringent element disposed on an optical path between the image-forming device and the polarizing layer, and a quarter-wave retarding element. Further provided is an optical system comprising a color combiner unit, at least two polarizing beamsplitters (PBSs), and a first quarter-wave retarding element. The present application also provides methods of compensating for birefringence in an image projection system.
    Type: Grant
    Filed: April 22, 2010
    Date of Patent: January 24, 2012
    Assignee: 3M Innovative Properties Company
    Inventors: David J. W. Aastuen, Charles L. Bruzzone, Jiaying Ma
  • Publication number: 20110134659
    Abstract: In one embodiment, the invention provides backlight comprising a front reflector (102) and a back reflector (104) disposed to form a hollow light cavity (106) with a first light source (108) proximate one end of the front reflector (102) and having a tilt angle (110) of from 5° to 90°, and a first asymmetric light collimator (116) extending between at least the first light source (108) and the back reflector (104) for directing light from the first light source (108) into the hollow light cavity (106).
    Type: Application
    Filed: June 1, 2009
    Publication date: June 9, 2011
    Inventors: David J. W. Aastuen, Kenneth A. Epstein, Byung-Soo Ko, John A. Wheatley
  • Publication number: 20100208210
    Abstract: An optical system is provided. The optical system comprises a first polarizing beamsplitter (PBS), a first reflecting image-forming device, and a first quarter-wave retarding element. An optical system is also provided that comprises an image-forming device, a reflective polarizing layer, at least a first birefringent element disposed on an optical path between the image-forming device and the polarizing layer, and a quarter-wave retarding element. Further provided is an optical system comprising a color combiner unit, at least two polarizing beamsplitters (PBSs), and a first quarter-wave retarding element. The present application also provides methods of compensating for birefringence in an image projection system.
    Type: Application
    Filed: April 22, 2010
    Publication date: August 19, 2010
    Inventors: David J.W. Aastuen, Charles L. Bruzzone, Jiaying Ma
  • Patent number: 7731366
    Abstract: An optical system is provided. The optical system comprises a first polarizing beamsplitter (PBS), a first reflecting image-forming device, and a first quarter-wave retarding element. An optical system is also provided that comprises an image-forming device, a reflective polarizing layer, at least a first birefringent element disposed on an optical path between the image-forming device and the polarizing layer, and a quarter-wave retarding element. Further provided is an optical system comprising a color combiner unit, at least two polarizing beamsplitters (PBSs), and a first quarter-wave retarding element. The present application also provides methods of compensating for birefringence in an image projection system.
    Type: Grant
    Filed: February 26, 2008
    Date of Patent: June 8, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: David J. W. Aastuen, Charles L. Bruzzone, Jiaying Ma
  • Patent number: 7652820
    Abstract: An optical imaging system including an illumination system, a Cartesian PBS, and a prism assembly. The illumination system provides a beam of light, the illumination system having an ƒ/# less than or equal to 2.5. The Cartesian polarizing beam splitter has a first tilt axis, oriented to receive the beam of light. A first polarized beam of light having one polarization direction is folded by the Cartesian polarizing beam splitter and a second polarized beam of light having a second polarization direction is transmitted by the Cartesian polarizing beam splitter. The Cartesian polarizing beam splitter nominally polarizes the beam of light with respect to the Cartesian beam splitter to yield the first polarized beam in the first polarization direction. The color separation and recombination prism is optically aligned to receive the first polarized beam. The prism has a second tilt axis, a plurality of color separating surfaces, and a plurality of exit surfaces.
    Type: Grant
    Filed: December 22, 2005
    Date of Patent: January 26, 2010
    Assignee: 3M Innovative Properties Company
    Inventors: David J. W. Aastuen, Charles L. Bruzzone
  • Patent number: 7568804
    Abstract: Single imager projection systems suffer from low light throughput, compared to three imager systems, because only one color band is illuminated at any one time. As a result, there is a need to increase the operating efficiency of the single imager projection system. The invention is directed to the incorporation of a high extinction ratio pre-polarizer, such as a compensated, multi-layer polarizer, in a single or dual imager projection system. This permits illumination with low f-number illumination light, and thus increases the efficiency of the projection system. The pre-polarizer may be incorporated within a polarization recovery unit to further enhance system efficiency.
    Type: Grant
    Filed: May 15, 2007
    Date of Patent: August 4, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Jiaying Ma, Charles L. Bruzzone, David J. W. Aastuen
  • Patent number: 7542194
    Abstract: A projection system includes an image-forming device and a polarizing beamsplitter. Illumination light illuminates the image-forming device via the first polarizing beamsplitter. A retardation element is disposed between the image-forming device and the polarizing beamsplitter. A bias controller applies a bias to pixels of the image-forming device in the dark state so as to substantially maximize contrast in image light reflected from image-forming device. In some arrangements, the volume between the polarizing beamsplitter and the image-forming device is sealed, with the retarding element being disposed within the sealed volume and being attached to either the polarizing beamsplitter or the image-forming device.
    Type: Grant
    Filed: December 8, 2005
    Date of Patent: June 2, 2009
    Assignee: 3M Innovative Properties Company
    Inventors: Charles L. Bruzzone, David J. W. Aastuen, Michael P. Keyes
  • Publication number: 20090009721
    Abstract: An optical system is provided. The optical system comprises a first polarizing beamsplitter (PBS), a first reflecting image-forming device, and a first quarter-wave retarding element. An optical system is also provided that comprises an image-forming device, a reflective polarizing layer, at least a first birefringent element disposed on an optical path between the image-forming device and the polarizing layer, and a quarter-wave retarding element. Further provided is an optical system comprising a color combiner unit, at least two polarizing beamsplitters (PBSs), and a first quarter-wave retarding element. The present application also provides methods of compensating for birefringence in an image projection system.
    Type: Application
    Filed: February 26, 2008
    Publication date: January 8, 2009
    Inventors: David J.W. Aastuen, Charles L. Bruzzone, Jiaying Ma
  • Patent number: 7357511
    Abstract: Some projection systems use a polarization beamsplitter (PBS) for coupling light to and from an image-forming device. The PBS is typically formed with a reflective polarizing layer disposed between glass covers. Stress birefringence in the glass cover lying between the reflective polarizing layer and the image-forming device can reduce the image contrast of the projection system. A quarter-wave retarding element positioned between the glass cover and the image-forming device is used to compensate for the birefringence, at least in part. This permits the PBS to use glass covers formed of a glass material having a higher stress optic coefficient than before, while still maintaining high image contrast.
    Type: Grant
    Filed: March 23, 2005
    Date of Patent: April 15, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: David J. W. Aastuen, Charles L. Bruzzone, Jiaying Ma
  • Patent number: 7329006
    Abstract: Generally, the present invention relates to an apparatus for reducing astigmatism in a projection system that is particularly well suited to reducing astigmatism in LCD projection systems. A projection system includes a light source to generate light, conditioning optics to condition the light from the light source and an imaging core to impose on image on conditioned light from the conditioning optics to form image light. The imaging core includes a polarizing beamsplitter and at least one imager, and at least one element in the imaging core is adapted to reduce astigmatism in the image light. The astigmatism may arise in the polarizing beamsplitter. A projection lens system projects the astigmatism-reduced image light from the imaging core.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: February 12, 2008
    Assignee: 3M Innovative Properties Company
    Inventors: David J. W. Aastuen, Charles L. Bruzzone, Stephen K. Eckhardt, Jiaying Ma
  • Patent number: 7237899
    Abstract: Single imager projection systems suffer from low light throughput, compared to three imager systems, because only one color band is illuminated at any one time. As a result, there is a need to increase the operating efficiency of the single imager projection system. The invention is directed to the incorporation of a high extinction ratio pre-polarizer, such as a compensated, multi-layer polarizer, in a single or dual imager projection system. This permits illumination with low f-number illumination light, and thus increases the efficiency of the projection system. The pre-polarizer may be incorporated within a polarization recovery unit to further enhance system efficiency.
    Type: Grant
    Filed: May 16, 2003
    Date of Patent: July 3, 2007
    Assignee: 3M Innovative Properties Company
    Inventors: Jiaying Ma, Charles L. Bruzzone, David J. W. Aastuen
  • Patent number: 7023602
    Abstract: An optical imaging system including an illumination system, a Cartesian PBS, and a prism assembly. The illumination system provides a beam of light, the illumination system having an f/# less than or equal to 2.5. The Cartesian polarizing beam-splitter has a first tilt axis, oriented to receive the beam of light. A first polarized beam of light having one polarization direction is folded by the Cartesian polarizing beam splitter and a second polarized beam of light having a second polarization direction is transmitted by the Cartesian polarizing beam splitter. The Cartesian polarizing beam splitter nominally polarizes the beam of light with respect to the Cartesian beam-splitter to yield the first polarized beam in the first polarization direction. The color separation and recombination prism is optically aligned to receive the first polarized beam. The prism has a second tilt axis, a plurality of color separating surfaces, and a plurality of exit surfaces.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: April 4, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: David J. W. Aastuen, Charles L. Bruzzone
  • Patent number: 6992822
    Abstract: In one embodiment, a projection screen includes a diffuse reflecting polarizer that diffusively reflects light polarized in a first direction and transmits light polarized in a second direction. The projection screen may also include a second polarizer adjacent a back side of the diffuse reflecting polarizer, wherein the second polarizer is oriented to transmit light polarized in the second direction. The projection screen may appear substantially diffuse when viewed from a front side and substantially transparent when viewed from a back side.
    Type: Grant
    Filed: May 3, 2005
    Date of Patent: January 31, 2006
    Assignee: 3M Innovative Properties Company
    Inventors: Jiaying Ma, David J. W. Aastuen, Abolghassem B. Mahmoodi