Patents Assigned to Siemens Nixdorf Informationssysteme Aktiengesellchaft
  • Patent number: 5548487
    Abstract: A flat circuit module assembly includes a circuit board and unpackaged, or housingless, chips mounted on its surface, with an elastic pressure pad between the circuit board and the chips. To achieve an adequate spring characteristic, the elastic pressure pad is dimensioned to be correspondingly thick, the consequence of which is that the Z bend of the terminal legs would be greater than would actually be needed for compensating for the thermal stress. To avoid this disadvantage, the invention provides depressions on the circuit board surface into which the pressure pads are placed. This reduces the tolerance range in the surface soldering area. The invention also provides that the circuit board is a multilayer board that has internal conductors, and further that the depression into with the pressure pad is placed extends to one of the internal conductive layers.
    Type: Grant
    Filed: May 17, 1993
    Date of Patent: August 20, 1996
    Assignee: Siemens Nixdorf Informationssysteme Aktiengesellchaft
    Inventors: Berhard Brabetz, Hermann Wessely