Patents by Inventor Doo-Young Hah

Doo-Young Hah 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).

  • Patent number: 7085122
    Abstract: A MEMS tunable capacitor with angular vertical comb-drive (AVC) actuators is described where high capacitances and a wide continuous tuning range is achieved in a compact space. The comb fingers rotate through a small vertical angle which allows a wider tuning range than in conventional lateral comb drive devices. Fabrication of the device is straightforward, and involves a single deep reactive ion etching step followed by release and out-of-plane assembly of the angular combs.
    Type: Grant
    Filed: May 21, 2004
    Date of Patent: August 1, 2006
    Assignee: The Regents of the University of California
    Inventors: Ming C. Wu, Hung D. Nguyen, Doo-Young Hah, Pamela R. Patterson
  • Publication number: 20050013087
    Abstract: A MEMS tunable capacitor with angular vertical comb-drive (AVC) actuators is described where high capacitances and a wide continuous tuning range is achieved in a compact space. The comb fingers rotate through a small vertical angle which allows a wider tuning range than in conventional lateral comb drive devices. Fabrication of the device is straightforward, and involves a single deep reactive ion etching step followed by release and out-of-plane assembly of the angular combs.
    Type: Application
    Filed: May 21, 2004
    Publication date: January 20, 2005
    Inventors: Ming Wu, Hung Nguyen, Doo-Young Hah, Pamela Patterson
  • Patent number: 6822776
    Abstract: The present invention relates to a scanning micromirror for optical communications. The scanning micromirror comprises an outer frame having an aperture therein, an inner frame located within the aperture of the outer frame and having an aperture therein, an optical reflecting means located within the aperture of the inner frame, a plurality of first torsion springs connected between an inner wall of the outer frame and an outer wall of the inner frame, for supporting the inner frame, a plurality of second torsion springs connected between the inner wall of the inner frame and the optical reflecting means, for supporting the optical reflecting means, first comb-type electrostatic actuators for applying electrostatic torque by which the inner frame is rotated about an axis of the first torsion springs, and second comb-type electrostatic actuators for applying electrostatic torque by which the optical reflecting means is rotated about an axis of the second torsion springs.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: November 23, 2004
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Doo-Young Hah, Ho-Jun Ryu, Chang-Auck Choi, Chi-Hoon Jun, Youn Tae Kim
  • Patent number: 6791731
    Abstract: The present invention relates to a micro-optical switch and comprises an external frame having a plurality of holes inside; an internal frame positioned in the plurality of holes and having holes inside; light reflecting means positioned inside the holes of the internal frame; external magnetic substances positioned at both sides of the external frame; outside torsion hinge for connecting the external frame to the internal frame and having 45° to the magnetic field produced by the external magnetic substances; inside torsion hinge for connecting the internal frame to the light reflecting means and for being perpendicular to said outside torsion hinge; an outside coil wired in the internal frame; and an inside coil wired in the light reflecting means, and is characterized in that the light reflecting means and the internal frame are preferably rotated by the inside torsion hinge and the outside torsion hinge as an axis when a current is applied to the inside coil and the outside coil.
    Type: Grant
    Filed: December 27, 2002
    Date of Patent: September 14, 2004
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ho Jun Ryu, Doo Young Hah, Chi Hoon Jun, Yun Tae Kim
  • Publication number: 20040070806
    Abstract: The present invention relates to a micro-optical switch and comprises an external frame having a plurality of holes inside; an internal frame positioned in the plurality of holes and having holes inside; light reflecting means positioned inside the holes of the internal frame; external magnetic substances positioned at both sides of the external frame; outside torsion hinge for connecting the external frame to the internal frame and having 45° to the magnetic field produced by the external magnetic substances; inside torsion hinge for connecting the internal frame to the light reflecting means and for being perpendicular to said outside torsion hinge; an outside coil wired in the internal frame; and an inside coil wired in the light reflecting means, and is characterized in that the light reflecting means and the internal frame are preferably rotated by the inside torsion hinge and the outside torsion hinge as an axis when a current is applied to the inside coil and the outside coil.
    Type: Application
    Filed: December 27, 2002
    Publication date: April 15, 2004
    Inventors: Ho Jun Ryu, Doo Young Hah, Chi Hoon Jun, Yun Tae Kim
  • Publication number: 20040032634
    Abstract: The present invention relates to a scanning micromirror for optical communications. The scanning micromirror comprises an outer frame having an aperture therein, an inner frame located within the aperture of the outer frame and having an aperture therein, an optical reflecting means located within the aperture of the inner frame, a plurality of first torsion springs connected between an inner wall of the outer frame and an outer wall of the inner frame, for supporting the inner frame, a plurality of second torsion springs connected between the inner wall of the inner frame and the optical reflecting means, for supporting the optical reflecting means, first comb-type electrostatic actuators for applying electrostatic torque by which the inner frame is rotated about an axis of the first torsion springs, and second comb-type electrostatic actuators for applying electrostatic torque by which the optical reflecting means is rotated about an axis of the second torsion springs.
    Type: Application
    Filed: December 3, 2002
    Publication date: February 19, 2004
    Inventors: Doo-Young Hah, Ho-Jun Ryu, Chang-Auck Choi, Chi-Hoon Jun, Youn Tae Kim