Patents by Inventor Venkatakrishnan Krishnan

Venkatakrishnan Krishnan 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).

  • Focusing an optical beam to two foci
    Patent number: 7858901
    Abstract: A Plate polarising beam splitter 22 splits an incident laser beam 21 to form a first laser beam 24 and a second laser beam 25. The first laser beam is optically modified using an arcuate reflector 23 so that the first laser beam has a different divergence or convergence from that of the second laser beam. The first laser beam 24 is focussed at a first focus 27 on an optical axis of a focussing lens 26 and the second laser beam is focussed at a second focus 28 on the optical axis for machining a workpiece. The apparatus is suitable for machining with the laser beams steered by a galvanometer scanner.
    Type: Grant
    Filed: May 27, 2004
    Date of Patent: December 28, 2010
    Assignee: Electro Scientific Industries, Inc.
    Inventors: Venkatakrishnan Krishnan, Tan Bo
  • Focusing an optical beam to two foci
    Publication number: 20060261050
    Abstract: A Plate polarising beam splitter 22 splits an incident laser beam 21 to form a first laser beam 24 and a second laser beam 25. The first laser beam is optically modified using an arcuate reflector 23 so that the first laser beam has a different divergence or convergence from that of the second laser beam. The first laser beam 24 is focussed at a first focus 27 on an optical axis of a focussing lens 26 and the second laser beam is focussed at a second focus 28 on the optical axis for machining a workpiece. The apparatus is suitable for machining with the laser beams steered by a galvanometer scanner.
    Type: Application
    Filed: May 27, 2004
    Publication date: November 23, 2006
    Inventors: Venkatakrishnan Krishnan, Tan Bo