Patents by Inventor Louis M. Swart

Louis M. Swart 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: 4441122
    Abstract: A television camera comprising a control circuit for controlling the electron beam current intensity in a pick-up tube which has a current-controlled electron gun, for example a diode gun. The control circuit comprises a controllable current source an output of which is connected to the anode of the diode gun, which anode acts as a control electrode, and a control input of which is coupled to a pick-up tube output for producing a picture signal. In order to obtain a dynamic additional focussing of the electron beam when an electrostatic focussing means is employed the cathode of the electron gun is connected to a voltage source via a, for example, variable resistor.
    Type: Grant
    Filed: January 18, 1982
    Date of Patent: April 3, 1984
    Assignee: U.S. Philips Corporation
    Inventor: Louis M. Swart
  • Patent number: 4196369
    Abstract: In order to avoid picture disturbances by electric charging phenomena on the tube wall in a camera tube in which no target material is present on the inner wall of the cylinder tube, the tube wall is provided with a surface potential stabilizing material between the window connection and the mesh electrode of the camera tube. This stabilization can be realized by way of a local cover layer having the desired electric conductivity or secondary emission properties, or by locally adapting properties of the glass of the tube wall thereto.
    Type: Grant
    Filed: April 8, 1977
    Date of Patent: April 1, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Jacob H. Geus, Louis M. Swart