Patents by Inventor Zhuan Yun Zhang

Zhuan Yun 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).

  • Optical system having selectable field for inspection
    Patent number: 7830597
    Abstract: An optical system for viewing an object has a plurality of lenses and a main optical axis coincident with the centers of the lenses. The optical system further comprises a low magnification optical subsystem that is operative to view the object at a first magnification and a high magnification optical subsystem that is operative to view the object at a second magnification that is higher than the first magnification. The high magnification optical subsystem has a high magnification optical axis along which light rays that are received from the main optical axis are transmitted. A movable element is locatable on the high magnification optical axis and is movable in directions transverse to the axis for receiving and transmitting light rays.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: November 9, 2010
    Assignee: ASM Assembly Automation Ltd
    Inventors: Siu Wing Lau, Zhuan Yun Zhang, Yiu Ming Cheung, Chi Ping Hung
  • OPTICAL SYSTEM HAVING SELECTABLE FIELD FOR INSPECTION
    Publication number: 20090067043
    Abstract: An optical system for viewing an object has a plurality of lenses and a main optical axis coincident with the centers of the lenses. The optical system further comprises a low magnification optical subsystem that is operative to view the object at a first magnification and a high magnification optical subsystem that is operative to view the object at a second magnification that is higher than the first magnification. The high magnification optical subsystem has a high magnification optical axis along which light rays that are received from the main optical axis are transmitted. A movable element is locatable on the high magnification optical axis and is movable in directions transverse to the axis for receiving and transmitting light rays.
    Type: Application
    Filed: September 11, 2007
    Publication date: March 12, 2009
    Inventors: Siu Wing LAU, Zhuan Yun ZHANG, Yiu Ming CHEUNG, Chi Ping HUNG