Patents by Inventor Chinh Tan

Chinh Tan 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).

  • Scanning devices and methods using surface emitting laser diodes
    Publication number: 20080308639
    Abstract: A bar code scanning device, system and method that utilizes one or more vertical cavity surface emitting laser diodes for producing at least one laser beam, where the vertical cavity surface emitting laser diodes are disposed on a substrate, and wherein the produced laser beam is substantially an essential single spatial mode laser beam. The bar code scanning device, system and method of present invention also comprise a photodiode attached to the substrate and arranged to receive at least a portion of the beam of light reflected off the scanned bar code or symbol.
    Type: Application
    Filed: August 7, 2008
    Publication date: December 18, 2008
    Inventors: Miklos Stern, Chinh Tan, Yajun Li, Howard Shepard, Thomas Mazz, Eric Barkan, Vikram Bhargava, Andrew Fusco, Mark Weitzner
  • Arrangement for and method of increasing pixel symmetry, especially for image projection arrangements
    Patent number: 7460287
    Abstract: A lightweight, compact image projection module, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality in color. The pixels are rendered symmetrical in cross-section by aligning a narrow dimension of a beam spot of a laser beam along scan lines of the raster pattern.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: December 2, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Chinh Tan, Dmitriy Yavid, Miklos Stern, Carl Wittenberg
  • Color laser projection display
    Patent number: 7445339
    Abstract: A method and apparatus are provided to provide a laser projection display (LPD).
    Type: Grant
    Filed: October 18, 2006
    Date of Patent: November 4, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Paul Dvorkis, Ron Goldman, Narayan Nambudiri, Carl Wittenberg, Chinh Tan, Miklos Stern, Dmitriy Yavid, Frederick F. Wood
  • High-resolution image projection
    Patent number: 7446822
    Abstract: A lightweight, compact image projection module, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality in monochrome, color or gray scale. Pixel size is controlled as a function of distance of the image from the module to control image resolution and allow the image to remain sharp and clear over an extended range of distances from the module.
    Type: Grant
    Filed: May 1, 2003
    Date of Patent: November 4, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Miklos Stern, Dmitriy Yavid, Chinh Tan, Frederick F. Wood
  • Large size image projection
    Patent number: 7441902
    Abstract: A plurality of image projection modules is operative for causing selected pixels in overlapping raster patterns to be illuminated to produce a large size image of high resolution of VGA quality in monochrome or color. The selected pixels in an overlap region of the patterns are illuminated at a lesser intensity to provide uniform brightness over the image. Multiple single mode lasers, or a multimode laser with an aperture stop, are employed to increase laser output power. Speckle noise is reduced by controlling the optical transmission characteristic of a projection screen. Three-dimensional images are generated by moving the screen. Cross-coupling between drive and feedback mechanisms in image projection is reduced for better image quality.
    Type: Grant
    Filed: October 27, 2004
    Date of Patent: October 28, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Paul Dvorkis, Ron Goldman, Chinh Tan, Dmitriy Yavid, Frederick F. Wood
  • Arrangement for and method of improving image quality, especially for image projection arrangements
    Patent number: 7433108
    Abstract: A lightweight, compact image projection module, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality in color. The brightness of the illuminated pixels is enhanced by combining constituent laser beams of the same wavelength. The contrast of the illuminated pixels is improved by sweeping a composite beam across a polarized screen, and by making the polarizations of all the constituent laser beams of the composite beam the same.
    Type: Grant
    Filed: April 25, 2007
    Date of Patent: October 7, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Chinh Tan, Miklos Stern
  • Scanning devices and methods using surface emitting laser diodes
    Patent number: 7428995
    Abstract: A bar code scanning device, system and method that utilizes one or more vertical cavity surface emitting laser diodes for producing at least one laser beam, where the vertical cavity surface emitting laser diodes are disposed on a substrate, and wherein the produced laser beam is substantially an essential single spatial mode laser beam. The bar code scanning device, system and method of present invention also comprise a photodiode attached to the substrate and arranged to receive at least a portion of the beam of light reflected off the scanned bar code or symbol.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: September 30, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Miklos Stern, Chinh Tan, Yajun Li, Howard Shepard, Thomas Mazz, Eric Barkan, Vikram Bhargava, Andrew Fusco, Mark Weitzner
  • Method and apparatus for conserving power in a laser projection display
    Patent number: 7425073
    Abstract: A method and apparatus are provided to controllably reduce power of a laser projection display (LPD). Light is scanned from a laser onto a viewing surface to produce an image thereon, and power used by the laser is reduced used while scanning at least a portion of the viewing surface.
    Type: Grant
    Filed: May 31, 2004
    Date of Patent: September 16, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Frederick F. Wood, Paul Dvorkis, Ron Goldman, Narayan Nambudiri, Miklos Stern, Chinh Tan, Carl Wittenberg, Dmitriy Yavid
  • Photodiode with improved performance in ambient light
    Publication number: 20080203164
    Abstract: An arrangement for improving performance of a sensor operative for collecting light from a target to generate a data signal in a presence of ambient light, includes a sample and hold circuit for operating the sensor during a sampling time period in which the sensor only collects the ambient light to generate an ambient signal, and during a holding time period in which the sensor collects both the ambient light and the light from the target to generate a composite signal comprised of the ambient signal and the data signal; and a subtracting circuit operative for subtracting the ambient signal from the composite signal to produce the data signal as an output.
    Type: Application
    Filed: February 28, 2007
    Publication date: August 28, 2008
    Inventors: Costanzo DiFazio, Dmitriy Yavid, Miklos Stern, Chinh Tan, Askold Strat, Daniel Gonzalez
  • Aperture stop in an image projection arrangement for preserving color fidelity over an image
    Publication number: 20080204541
    Abstract: A lightweight, compact image projection module has a laser assembly for emitting a plurality of laser beams of different wavelengths, an optical assembly for focusing and nearly collinearly arranging the laser beams to form a composite beam, a scanner for sweeping the composite beam in a pattern of scan lines, each scan line having a number of pixels, and a controller for causing selected pixels to be illuminated, and rendered visible, by the composite beam to produce the image. An aperture stop located between the laser assembly and the scanner, limits a cross-sectional dimension of at least one of the laser beams to below a prescribed level to preserve color fidelity over the image.
    Type: Application
    Filed: February 28, 2007
    Publication date: August 28, 2008
    Inventors: Chinh Tan, Carl Wittenberg
  • Method and apparatus for controllably producing a laser display
    Patent number: 7414621
    Abstract: A laser projection device (LPD) suitable for displaying color images is disclosed. The LPD is used to excite various photoluminescent materials located on a display screen so as to produce multi-color displays. Additionally, the screen may be movably mounted so as to reduce laser speckling.
    Type: Grant
    Filed: October 31, 2004
    Date of Patent: August 19, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Dmitriy Yavid, Paul Dvorkis, Ron Goldman, Joseph Katz, Narayan Nambudiri, Miklos Stern, Chinh Tan, Carl Wittenberg, Frederick F. Wood
  • Color image projection arrangement and method
    Patent number: 7367682
    Abstract: A lightweight, compact image projection module, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality in color.
    Type: Grant
    Filed: January 26, 2005
    Date of Patent: May 6, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Paul Dvorkis, Ron Goldman, Chinh Tan, Dmitriy Yavid, Miklos Stern, Carl Wittenberg, Frederick F. Wood, Askold Strat, Michael Slutsky, Narayan Nambudiri, Richard Rizza, Thomas Mazz, Lisa Fan
  • Laser projection display
    Patent number: 7369584
    Abstract: A method and apparatus are provided for controlling the operation of a Laser Projection Display (LPD). Generally, the LPD is comprised of a laser, an optical system and a controller. The laser is adapted to emit a beam of laser light. The optical system is adapted to scan the beam of laser light on a display surface in a two-dimensional raster pattern. The controller is adapted to control the rate at which the laser beam is scanned to produce regions of varying resolution on the display surface. The controller is also adapted to present laser light onto the display surface within only selected portions of the two-dimensional raster scan pattern so that spaced apart image regions may be created.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: May 6, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Ron Goldman, Paul Dvorkis, Joseph Katz, Narayan Nambudiri, Miklos Stern, Chinh Tan, Carl Wittenberg, Frederick F. Wood, Dmitriy Yavid
  • Color image projection system and method
    Patent number: 7357512
    Abstract: An image projection system projects an image on a projection screen having a phosphor for converting incident violet light into green light which, together with red and blue light, creates the image in full color. The screen includes an apertured mask having apertures filled with the phosphor, or a phosphor plate in contact with the mask and having lenslets extending through and past the apertures.
    Type: Grant
    Filed: January 26, 2005
    Date of Patent: April 15, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Chinh Tan, Paul Dvorkis, Miklos Stern, Frederick F. Wood
  • Method and apparatus for controllably modulating a laser in a laser projection display
    Publication number: 20080055557
    Abstract: A laser projection device suitable for displaying full color images is disclosed. The LPD includes a variety of techniques for modulating laser beams produced by one or more lasers with image data to controllably produce the image using a modified raster scan.
    Type: Application
    Filed: October 2, 2007
    Publication date: March 6, 2008
    Inventors: Dmitriy Yavid, Paul Dvorkis, Ron Goldman, Joseph Katz, Narayan Nambudiri, Miklos Stern, Chinh Tan, Carl Wittenberg, Frederick Wood
  • Method and apparatus for controllably modulating a laser in a laser projection display
    Patent number: 7325929
    Abstract: A laser projection device suitable for displaying full color images is disclosed. The LPD includes a variety of techniques for modulating laser beams produced by one or more lasers with image data to controllably produce the image using a modified raster scan.
    Type: Grant
    Filed: July 31, 2004
    Date of Patent: February 5, 2008
    Assignee: Symbol Technologies, Inc.
    Inventors: Dmitriy Yavid, Paul Dvorkis, Ron Goldman, Joseph Katz, Narayan Nambudiri, Miklos Stern, Chinh Tan, Carl Wittenberg, Frederick F. Wood
  • Arrangement for and method of improving image quality, especially for image projection arrangements
    Patent number: 7312911
    Abstract: A lightweight, compact image projection module, especially for mounting in a housing having a light-transmissive window, is operative for causing selected pixels in a raster pattern to be illuminated to produce an image of high resolution of VGA quality in color. The brightness of the illuminated pixels is enhanced by combining constituent laser beams of the same wavelength. The contrast of the illuminated pixels is improved by sweeping a composite beam across a polarized screen, and by making the polarizations of all the constituent laser beams of the composite beam the same.
    Type: Grant
    Filed: May 20, 2005
    Date of Patent: December 25, 2007
    Assignee: Symbol Technologies, Inc.
    Inventors: Chinh Tan, Miklos Stern
  • Arrangement for and method of projecting an image with safety circuitry
    Publication number: 20070285625
    Abstract: Red, blue and green lasers respectively emit a plurality of red, blue and green laser beams having respective output powers. The beams are optically focused and collinearly arranged to form a composite beam which is swept by a pair of scan mirrors in a pattern of scan lines on a projection surface, each scan line having a number of pixels. A controller causes selected pixels to be illuminated, and rendered visible, by the composite beam to produce an image. A safety circuit detects a malfunction of at least one of the lasers and the scan mirrors, and deenergizes the at least one of the lasers and the scan mirrors upon detection of the malfunction.
    Type: Application
    Filed: June 5, 2006
    Publication date: December 13, 2007
    Inventors: Dmitriy Yavid, Miklos Stern, Thomas Mazz, Costanzo Difazio, Chinh Tan, Carl Wittenberg, Daniel Gonzalez
  • Arrangement for and method of projecting an image with modulated lasers
    Publication number: 20070279509
    Abstract: An acousto-optical modulator modulates a green laser beam, and generates a modulated non-diffracted beam and a modulated diffracted beam. A scanner sweeps the modulated diffracted green beam, as well as modulated red and blue beams, as a pattern of scan lines, each scan line having a number of pixels. A controller causes selected pixels along the scan lines to be illuminated, and rendered visible, by the diffracted green beam, the red beam and the blue beam to produce the image. The non-diffracted green beam is employed in a laser shut-down safety circuit.
    Type: Application
    Filed: June 5, 2006
    Publication date: December 6, 2007
    Inventors: Chinh Tan, Miklos Stern, Dmitriy Yavid, Askold Strat, Frederick F. Wood, Michael Slutsky, Richard Rizza, Carl Wittenberg
  • Arrangement for and method of projecting an image to be viewed over extended viewing range
    Publication number: 20070279536
    Abstract: A laser beam is swept by a scan mirror as a pattern of scan lines on a projection surface. Selected pixels arranged along each scan line are illuminated to produce an image. The laser beam is optically modified to form each scan line with a desired high resolution having no less than a desired large number of the pixels over an extended viewing range, by focusing the laser beam to form a beam waist having a scan dimension proportional to the resolution at a focal location positioned between the scan mirror and the projection surface.
    Type: Application
    Filed: June 5, 2006
    Publication date: December 6, 2007
    Inventors: Chinh Tan, Dmitriy Yavid, Miklos Stern