Patents by Inventor Wolfram Doetzel

Wolfram Doetzel 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: 8186225
    Abstract: The invention relates to a sensor element for pressure measurement, having a substrate (5) and at least one mass element (1), which is arranged spaced apart from the substrate (5) and is connected in an oscillating manner to the substrate (5) and/or a support body (6) fixed relative to the substrate (5), so that a gap is formed between the mass element (1) and the substrate (5), the width of which can be varied through oscillations of the mass element (1). At least one recess and/or at least one bushing (4) is located in the surface of the substrate (5) delimiting the gap, which recess is used for reducing the damping of the oscillation of the mass element through the gas or plasma surrounding the mass element (1). The sensor element is used in particular in pressure sensors for measuring pressures in the vacuum range. Through the use of the sensor element according to the invention as a pressure sensor, maximum pressures up to the range of atmospheric air pressure can be recorded.
    Type: Grant
    Filed: May 9, 2007
    Date of Patent: May 29, 2012
    Assignees: Fraunhofer-Gesellschaft zur Foerderung der Angewandten Forschung E.V., Technische Univeristaet Chemnitz
    Inventors: Steffen Kurth, Dirk Tenholte, Karla Hiller, Christian Kaufmann, Thomas Gessner, Wolfram Doetzel
  • Publication number: 20100024562
    Abstract: The invention relates to a sensor element for pressure measurement, having a substrate (5) and at least one mass element (1), which is arranged spaced apart from the substrate (5) and is connected in an oscillating manner to the substrate (5) and/or a support body (6) fixed relative to the substrate (5), so that a gap is formed between the mass element (1) and the substrate (5), the width of which can be varied through oscillations of the mass element (1). At least one recess and/or at least one bushing (4) is located in the surface of the substrate (5) delimiting the gap, which recess is used for reducing the damping of the oscillation of the mass element through the gas or plasma surrounding the mass element (1). The sensor element is used in particular in pressure sensors for measuring pressures in the vacuum range. Through the use of the sensor element according to the invention as a pressure sensor, maximum pressures up to the range of atmospheric air pressure can be recorded.
    Type: Application
    Filed: May 9, 2007
    Publication date: February 4, 2010
    Applicant: FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.,
    Inventors: Steffen Kurth, Dirk Tenholte, Karla Hiller, Christian Kaufmann, Thomas Gessner, Wolfram Doetzel
  • Patent number: 6975442
    Abstract: A resonance scanner, wherein a frame (3), a drive plate (4), a mirror (5) and torsion springs (6, 7) form an actuator part (1), said drive plate (4) being attached within the frame (3) by two first torsion springs (6) such that the drive plate (4) can oscillate about a common first axis of torsion (8) of both torsion springs (6), said mirror (5) being attached within the drive plate (4) by two second torsion springs (7) such that the mirror (5) can oscillate about a common second axis of torsion (9) of both torsion springs (7), and said first axis of torsion (8) and said second axis of torsion (9) being parallel to each other; wherein, further, only the frame (3) of the actuator part (1) is attached to side walls (10) of a box-shaped stator part (2), a drive means (stator electrodes 15 or coil 24) is arranged at a bottom (11) of the stator part (2) only in the region of the geometrical surface area of the drive plate (4) and said bottom (11) has a recess (13) in the region of the geometrical surface area of t
    Type: Grant
    Filed: April 12, 2002
    Date of Patent: December 13, 2005
    Assignee: Jenoptik Ldt GmbH
    Inventors: Thomas Gessner, Wolfram Doetzel, Christian Kaufmann, Jan Mehner, Ramon Hahn, Steffen Kurt
  • Publication number: 20040130765
    Abstract: A resonance scanner, wherein a frame (3), a drive plate (4), a mirror (5) and torsion springs (6, 7) form an actuator part (1), said drive plate (4) being attached within the frame (3) by two first torsion springs (6) such that the drive plate (4) can oscillate about a common first axis of torsion (8) of both torsion springs (6), said mirror (5) being attached within the drive plate (4) by two second torsion springs (7) such that the mirror (5) can oscillate about a common second axis of torsion (9) of both torsion springs (7), and said first axis of torsion (8) and said second axis of torsion (9) being parallel to each other; wherein, further, only the frame (3) of the actuator part (1) is attached to side walls (10) of a box-shaped stator part (2), a drive means (stator electrodes 15 or coil 24) is arranged at a bottom (11) of the stator part (2) only in the region of the geometrical surface area of the drive plate (4) and said bottom (11) has a recess (13) in the region of the geometrical surface area of t
    Type: Application
    Filed: October 9, 2003
    Publication date: July 8, 2004
    Inventors: Thomas Gessner, Wolfram Doetzel, Christian Kaufmann, Jan Mehner, Ramon Hahn, Steffen Kurt