Patents by Inventor Alfred R. Ditthardt

Alfred R. Ditthardt 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: 4100576
    Abstract: An optical beam controller for use in an image reproducing system, in which information is stored in the spiral track of a disc record and retrieved by scanning the track with a light beam, comprises first and second ring-shaped axially poled magnets. The second magnet has a pivot bearing and is supported upon a pin coaxially with and in such proximity to the first magnet as to be mechanically captivated upon the pin by that magnet while remaining free for tilting displacement with respect to a pair of orthogonal axes. A mirror is coupled to the second magnet for concurrent displacement therewith when an energized electromagnet, which reacts with the field of the second magnet, effects a desired displacement of that magnet and the mirror about one or both axes.
    Type: Grant
    Filed: April 28, 1976
    Date of Patent: July 11, 1978
    Assignee: Zenith Radio Corporation
    Inventor: Alfred R. Ditthardt