Patents by Inventor Heng (Jade) Zhang

Heng (Jade) Zhang 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).

  • Laser power control arrangements in electro-optical readers
    Patent number: 7743989
    Abstract: Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of operating conditions not conforming to preestablished standards, and adjust power to the laser to enhance reader performance without violating prevalent safety standards. Dual monitors are used to independently monitor the output power of the laser.
    Type: Grant
    Filed: September 28, 2006
    Date of Patent: June 29, 2010
    Assignee: Symbol Technologies, Inc.
    Inventors: Vladimir Gurevich, Heng (Jade) Zhang, David Tsi Shi
  • Laser power control arrangements in electro-optical readers
    Publication number: 20080078835
    Abstract: Laser power control arrangements interrupt power to a laser used in electro-optical readers upon detection of operating conditions not conforming to preestablished standards, and adjust power to the laser to enhance reader performance without violating prevalent safety standards. Dual monitors are used to independently monitor the output power of the laser.
    Type: Application
    Filed: September 28, 2006
    Publication date: April 3, 2008
    Inventors: Vladimir Gurevich, Heng Jade Zhang, David Tsi Shi
  • Electro-optical reader with improved laser intensity modulation over extended working range
    Patent number: 7224538
    Abstract: The combination of a rooftop optical element and a soft edge aperture stop, as well as the introduction of a negative spherical aberration in a positive focusing lens, improve working distance and depth of focus in both moving beam and imaging readers for electro-optically reading indicia such as bar code symbols, especially for close-in symbols, and moreover tend to reduce undesirable light intensity modulation in the beam profile thereby improving reader performance.
    Type: Grant
    Filed: March 6, 2006
    Date of Patent: May 29, 2007
    Assignee: Symbol Technologies, Inc.
    Inventors: Igor Vinogradov, Vladimir Gurevich, David Tsi Shi, Dariusz J. Madej, Mehul M. Patel, Edward Barkan, Heng (Jade) Zhang
  • Electro-optical reader with improved laser intensity modulation over extended working range
    Patent number: 7063261
    Abstract: The combination of a rooftop optical element and a soft edge aperture stop, as well as the introduction of a negative spherical aberration in a positive focusing lens, improve working distance and depth of focus in both moving beam and imaging readers for electro-optically reading indicia such as bar code symbols, especially for close-in symbols, and moreover tend to reduce undesirable light intensity modulation in the beam profile thereby improving reader performance.
    Type: Grant
    Filed: July 23, 2004
    Date of Patent: June 20, 2006
    Assignee: Symbol Technologies, Inc.
    Inventors: Igor Vinogradov, Vladimir Gurevich, David Tsi Shi, Dariusz J. Madej, Mehul M. Patel, Edward Barkan, Heng (Jade) Zhang