Pressure-sensing semiconductor transducer

Claim 1

A pressure-sensing transducer comprising: a housing providing duct-connecting means and defining a chamber having one larger open end adjacent an end of the housing and its other smaller end interiorly of the housing, said housing generally concentric of an axis, and a passageway of relatively small diameter connecting the small end of the chamber and said duct-connecting means; a cup member of non-conducting material having an outer peripheral surface conforming to a substantial surface portion of the chamber adjacent its large end and defining a central cup-shaped cavity extending inwardly of the member away from said small end of the chamber to the bottom of the cavity; a generally cylindrical transducer unit containing a semi-conductor element seated with one end on a seating surface provided at the bottom of said cavity and extending outwardly thereof into said chamber at clearance with any side surfaces thereof; a ring of resilient non-conductive material encircling said unit with its inner surface in sealed frictional engagement with the outer cylindrical surface of the element, and an outer annular surface portion of the ring being in resilient engagement with annular surface portions of said cavity and said chamber to confine the ring in a fixed axial position; circuit connectors for said element extending through said member from said open end into an electrical connection with said element; and said housing having means for securing said member in fixed position within said chamber.