Patents by Inventor David K. Towner
David K. Towner 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: 10078216Abstract: An optical scanning apparatus includes: an array of optical emitters to provide a plurality of optical beams; a plurality of corresponding microlenses to receive the optical beams; and a variable collimator to receive the plurality of optical beams from the microlenses. The microlenses and variable collimator are arranged to decouple the illumination spot size of the optical beams from the illumination spot separation of the optical beams such that the illumination spot size and the illumination spot separation at a scanning surface are independently controllable.Type: GrantFiled: April 13, 2016Date of Patent: September 18, 2018Assignee: Hewlett-Packard Development Company, L.P.Inventors: Michael Plotkin, David K. Towner, Haim Livne, Mark Shechterman
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Publication number: 20160223811Abstract: An optical scanning apparatus, a system and a method of optical scanning independently determine illumination spot size and spacing. The apparatus includes an array of optical emitters to provide a plurality of optical beams and a plurality of microlenses to receive the optical beams. The microlenses form an intermediate image of the array at substantially unity array magnification. The apparatus further includes an adjustable collimator to receive the plurality of optical beams from the intermediate image, a beam scanner to scan the optical beams in an in-scan direction, and a scan lens to focus the scanned optical beams. An arrangement of illumination spots forms an image of the array.Type: ApplicationFiled: April 13, 2016Publication date: August 4, 2016Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.Inventors: Michael Plotkin, David K. Towner, Haim Livne, Mark Shechterman
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Patent number: 9348137Abstract: An optical scanning apparatus, a system and a method of optical scanning independently determine illumination spot size and spacing. The apparatus includes an array of optical emitters to provide a plurality of optical beams and a plurality of microlenses to receive the optical beams. The microlenses form an intermediate image of the array at substantially unity array magnification. The apparatus further includes an adjustable collimator to receive the plurality of optical beams from the intermediate image, a beam scanner to scan the optical beams in an in-scan direction, and a scan lens to focus the scanned optical beams. An arrangement of illumination spots forms an image of the array.Type: GrantFiled: June 10, 2011Date of Patent: May 24, 2016Assignee: Hewlett-Packard Development Company, L.P.Inventors: Michael Plotkin, David K. Towner, Haim Livne, Mark Schechterman
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Patent number: 8928720Abstract: Apparatus comprising a two-dimensional array of light sources (40) and a scanning device (26) arranged to scan light (14) emitted from the light sources (40) onto a medium (10) to generate a plurality of scan lines (52) on the medium (10), the light sources (24 and scanning device (26) being arranged such that a plurality of light sources (24) can be used to generate each scan line (52) of the plurality of scan lines (52).Type: GrantFiled: October 27, 2005Date of Patent: January 6, 2015Assignee: Hewlett-Packard Development Company, L.P.Inventors: David K. Towner, Michael Plotkin, Dror Kella
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Publication number: 20140085393Abstract: An optical scanning apparatus, a system and a method of optical scanning independently determine illumination spot size and spacing. The apparatus includes an array of optical emitters to provide a plurality of optical beams and a plurality of microlenses to receive the optical beams. The microlenses form an intermediate image of the array at substantially unity array magnification. The apparatus further includes an adjustable collimator to receive the plurality of optical beams from the intermediate image, a beam scanner to scan the optical beams in an in-scan direction, and a scan lens to focus the scanned optical beams. An arrangement of illumination spots forms an image of the array.Type: ApplicationFiled: June 10, 2011Publication date: March 27, 2014Inventors: Michael Plotkin, David K. Towner, Haim Livine, Mark Shechterman
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Publication number: 20100182893Abstract: An optical disk structure and optical disk recorder which enables data to be re-written onto the recording layer of the optical disk. A clock reference structure is permanently formed along servo tracks of the optical disk. An optical transducer is coupled to the clock reference structure and generates a clock reference signal simultaneously with writing new data onto the recording layer of the optical disk. The data is written as data marks along the servo tracks. Each of the data marks includes edges. The edges of the data marks are recorded in synchronization with a write clock. The write clock is phase-locked with the clock reference signal. Therefore, the edges of the data marks are aligned with the clock reference structure with sub-bit accuracy. Standard DVD-ROM disk readers are not able to detect the high spatial frequency of the clock reference structure.Type: ApplicationFiled: March 16, 2010Publication date: July 22, 2010Inventors: Daniel Y. ABRAMOVITCH, David K. TOWNER
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Patent number: 7701836Abstract: An optical disk structure and optical disk recorder which enables data to be re-written onto the recording layer of the optical disk. A clock reference structure is permanently formed along servo tracks of the optical disk. An optical transducer is coupled to the clock reference structure and generates a clock reference signal simultaneously with writing new data onto the recording layer of the optical disk. The data is written as data marks along the servo tracks. Each of the data marks includes edges. The edges of the data marks are recorded in synchronization with a write clock. The write clock is phase-locked with the clock reference signal. Therefore, the edges of the data marks are aligned with the clock reference structure with sub-bit accuracy. Standard DVD-ROM disk readers are not able to detect the high spatial frequency of the clock reference structure.Type: GrantFiled: August 9, 2006Date of Patent: April 20, 2010Assignee: Hewlett-Packard Development Company, L.P.Inventors: Daniel Y. Abramovitch, David K. Towner
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Patent number: 7460146Abstract: Systems and methods are described that dynamically correct field curvature and other focus errors in imaging systems that use rotating scanners to scan an image field. The dynamic correction controls the focusing of an image field such that focus is maintained across the width of a photosensitive element as a rotating scanner scans the field. The described systems and methods enable the use of post-objective scanning configurations in which the complexity and expense of objective lenses is significantly reduced.Type: GrantFiled: October 28, 2004Date of Patent: December 2, 2008Inventor: David K. Towner
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Publication number: 20080278566Abstract: Apparatus comprising a two-dimensional array of light sources (40) and a scanning device (26) arranged to scan light (14) emitted from the light sources (40) onto a medium (10) to generate a plurality of scan lines (52) on the medium (10), the light sources (24 and scanning device (26) being arranged such that a plurality of light sources (24) can be used to generate each scan line (52) of the plurality of scan lines (52).Type: ApplicationFiled: October 27, 2005Publication date: November 13, 2008Inventors: David K. Towner, Michael Plotkin, Dror Kella
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Patent number: 6765739Abstract: A method and apparatus for creating a machine-readable medium such as a CD or a DVD disc is disclosed. The disc includes encoded copy protection data that, when decoded and re-encoded, produces a tracking prevention sequence of bits that causes a duplicate disc (containing the re-encoded copy protection data) to temporarily lose tracking. The temporary loss of tracking is utilized to render the duplicated disc unusable by placing key data immediately following the encoded copy protection data.Type: GrantFiled: March 18, 2002Date of Patent: July 20, 2004Assignee: Hewlett-Packard Development Company, L.P.Inventors: Josh N. Hogan, David K. Towner
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Publication number: 20030174427Abstract: A method and apparatus for creating a machine-readable medium such as a CD or a DVD disc is disclosed. The disc includes encoded copy protection data that, when decoded and re-encoded, produces a tracking prevention sequence of bits that causes a duplicate disc (containing the re-encoded copy protection data) to temporarily lose tracking. The temporary loss of tracking is utilized to render the duplicated disc unusable by placing key data immediately following the encoded copy protection data.Type: ApplicationFiled: March 18, 2002Publication date: September 18, 2003Inventors: Josh N. Hogan, David K. Towner
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Publication number: 20030099007Abstract: A method of varying gloss in hard copy output from a hard copy output engine includes providing a user with a user-adjustable control for varying hard copy output gloss and varying at least one processing parameter in producing the hard copy output in response to user adjustment of the user-adjustable control to provide a first user-selected gloss level over a first portion of a page of hard copy output.Type: ApplicationFiled: November 29, 2001Publication date: May 29, 2003Inventors: David K. Towner, Ben B. Tyson, Laurent A. Regimbal, Lori Clifton
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Patent number: 6559878Abstract: An apparatus and method are provided for fusing toner to a print medium. According to one embodiment, the apparatus includes a laser source optically coupled to a predefined position in a print medium pathway. A laser beam generated by the laser source is directed to fall upon the print medium shuttled along the print medium pathway. Finally, a laser controller is coupled to the laser source to control the laser beam to generate a predefined fusing exposure of the laser beam on the print medium.Type: GrantFiled: December 20, 2000Date of Patent: May 6, 2003Assignee: Hewlett-Packard Development Co., L.P.Inventors: George V. McIlvaine, Laurent A. Regimbal, David K. Towner
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Patent number: 6536907Abstract: Optical projection systems for the display of electronic images often suffer from degraded image quality due to color field registration errors caused by lateral chromatic aberration. Although most projection lenses are partially corrected for lateral chromatic aberration during the design process, the uncorrected residual aberration limits the imaging performance of many projection displays, especially when displaying text and graphics with single-pixel-wide features. Some embodiments of the invention correct color field registration errors due to lateral chromatic aberration in multiple-imager projection systems. Other embodiments of the invention correct radial distortion and keystone distortion in single-imager and multiple-imager projection displays. In some embodiments of the invention, the imager(s) pixel geometry is arranged to compensate for optical aberrations, which result from the optical system so as to achieve a corrected image.Type: GrantFiled: February 8, 2000Date of Patent: March 25, 2003Assignee: Hewlett-Packard Development Company, L.P.Inventors: David K. Towner, Mark Butterworth
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Publication number: 20020075376Abstract: An apparatus and method are provided for fusing toner to a print medium. According to one embodiment, the apparatus includes a laser source optically coupled to a predefined position in a print medium pathway. A laser beam generated by the laser source is directed to fall upon the print medium shuttled along the print medium pathway. Finally, a laser controller is coupled to the laser source to control the laser beam to generate a predefined fusing exposure of the laser beam on the print medium.Type: ApplicationFiled: December 20, 2000Publication date: June 20, 2002Inventors: George V. Mcllvaine, Laurent A. Regimbal, David K. Towner
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Patent number: 6046968Abstract: An optical disk structure and optical disk recorder which enables data to be rewritten onto the recording layer of the optical disk. A clock reference structure is permanently formed along servo tracks of the optical disk. An optical transducer is coupled to the clock reference structure and generates a clock reference signal simultaneously with writing new data onto the recording layer of the optical disk. The data is written as data marks along the servo tracks. Each of the data marks includes edges. The edges of the data marks are recorded in synchronization with a write clock. The write clock is phase-locked with the clock reference signal. Therefore, the edges of the data marks are aligned with the clock reference structure with sub-bit accuracy. Standard DVD-ROM disk readers are not able to detect the high spatial frequency of the clock reference structure.Type: GrantFiled: July 24, 1997Date of Patent: April 4, 2000Assignee: Hewlett-Packard CompanyInventors: Daniel Y. Abramovitch, David K. Towner
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Patent number: 6046969Abstract: A system and method for generating a write clock for writing data along servo tracks of an erasable/rewriteable optical disk utilize clock patterns that correspond on a one-to-one basis to designated data zones on an optical disk. The clock patterns are located in one or more clock tracks and are dedicated to providing reference clock information. In one embodiment, an optical disk is divided radially into constant angular velocity (CAV) data zones and corresponding circular clock tracks are located near the outer edge of the disk. The circular clock tracks correspond on a one-to-one basis to the CAV data zones, and the unique clock patterns within the clock tracks are utilized to generate write clock signals. Clock information is read by a dedicated reference clock transducer and data is written to and read from a servo track of an optical disk by a read/write transducer.Type: GrantFiled: March 17, 1998Date of Patent: April 4, 2000Assignee: Hewlett-Packard CompanyInventors: David K. Towner, Josh N. Hogan
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Patent number: RE41881Abstract: An optical disk structure and optical disk recorder which enables data to be rewritten onto the recording layer of the optical disk. A clock reference structure is permanently formed along servo tracks of the optical disk. An optical transducer is coupled to the clock reference structure and generates a clock reference signal simultaneously with writing new data onto the recording layer of the optical disk. The data is written as data marks along the servo tracks. Each of the data marks includes edges. The edges of the data marks are recorded in synchronization with a write clock. The write clock is phase-locked with the clock reference signal. Therefore, the edges of the data marks are aligned with the clock reference structure with sub-bit accuracy. Standard DVD-ROM disk readers are not able to detect the high spatial frequency of the clock reference structure.Type: GrantFiled: November 27, 2001Date of Patent: October 26, 2010Assignee: Hewlett-Packard Development Company, L.P.Inventors: Daniel Y. Abramovitch, David K. Towner
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Patent number: RE43788Abstract: An optical disk structure and optical disk recorder which enables data to be re-written onto the recording layer of the optical disk. A clock reference structure is permanently formed along servo tracks of the optical disk. An optical transducer is coupled to the clock reference structure and generates a clock reference signal simultaneously with writing new data onto the recording layer of the optical disk. The data is written as data marks along the servo tracks. Each of the data marks includes edges. The edges of the data marks are recorded in synchronization with a write clock. The write clock is phase-locked with the clock reference signal. Therefore, the edges of the data marks are aligned with the clock reference structure with sub-bit accuracy. Standard DVD-ROM disk readers are not able to detect the high spatial frequency of the clock reference structure.Type: GrantFiled: March 16, 2010Date of Patent: November 6, 2012Assignee: Hewlett-Packard Development Company, L.P.Inventors: Daniel Y. Abramovitch, David K. Towner
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Patent number: RE45292Abstract: An optical disk structure and optical disk recorder which enables data to be rewritten onto the recording layer of the optical disk. A clock reference structure is permanently formed along servo tracks of the optical disk. An optical transducer is coupled to the clock reference structure and generates a clock reference signal simultaneously with writing new data onto the recording layer of the optical disk. The data is written as data marks along the servo tracks. Each of the data marks includes edges. The edges of the data marks are recorded in synchronization with a write clock. The write clock is phase-locked with the clock reference signal. Therefore, the edges of the data marks are aligned with the clock reference structure with sub-bit accuracy. Standard DVD-ROM disk readers are not able to detect the high spatial frequency of the clock reference structure.Type: GrantFiled: September 19, 2012Date of Patent: December 16, 2014Assignee: Hewlett-Packard Development Company, L.P.Inventors: Daniel Y. Abramovitch, David K. Towner