Patents Represented by Attorney David Treacy

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  • Optical velocity measuring with efficient use of radiation passing through patterns on discs
    Patent number: 5569912
    Abstract: A device for measuring the angular velocity of a rotating object (35) is described, which device comprises a first disc (23) moving with the object and having a rotationally symmetrical pattern of interruptions (24), and a second disc (29) having a similar pattern and a detector (34) which receives radiation passed by the patterns and converts it into an electric measuring signal. The device is very accurate, reliable and compact. The linear velocity of an elongated object, for example a recording tape, can also be measured with the device.
    Type: Grant
    Filed: September 29, 1994
    Date of Patent: October 29, 1996
    Assignee: U.S. Philips Corporation
    Inventors: Everardus T. G. Turk, Gerard Van Engelen, Jannis P. Van Der Linde