Integral transducer assemblies employing built-in pressure limiting
First Claim
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1. An electromechanical transducer for responding to the magnitude of an applied force, comprising:
- a. a semiconductor member having a depression of a predetermined depth located on a first surface thereof,b. at least one piezoresistive element diffused within said depression and located relatively centrally and comprising a given line configuration having a line width selected in accordance to said predetermined depth,c. pressure limiting means including a layer of glass coupled to said semiconductor member to cover said depression to restrain said semiconductor material containing said element from moving beyond said pressure limiting means.
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Abstract
A transducer of an H-shaped cross section employs a depression relatively equal to the line width of a diffused piezoresistor located in said depression. The depression is sealed by means of a glass member which acts as a "stop" for the transducer for all forces in excess of a rated force which causes a maximum diaphragm deflection relatively equal to the depth of said depression as selected in accordance with said resistor line width and the overall diaphragm diameter.
27 Citations
15 Claims
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1. An electromechanical transducer for responding to the magnitude of an applied force, comprising:
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a. a semiconductor member having a depression of a predetermined depth located on a first surface thereof, b. at least one piezoresistive element diffused within said depression and located relatively centrally and comprising a given line configuration having a line width selected in accordance to said predetermined depth, c. pressure limiting means including a layer of glass coupled to said semiconductor member to cover said depression to restrain said semiconductor material containing said element from moving beyond said pressure limiting means. - View Dependent Claims (2, 3, 4)
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5. An electromechanical transducer for responding to the magnitude of an applied force, comprising:
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a. a semiconductor member having a depression of a predetermined depth and of a given surface dimension located on a first surface thereof, b. at least one piezoresistive element diffused within said depression in a relatively central region thereof, and comprising a given line configuration having a line width selected in accordance with said predetermined depth, c. a sheet of glass of a dimension greater than said surface dimension secured to said semiconductor member to cover said depression, said glass sheet having a plurality of apertures located on the surface thereof and aligned to surround said central region within a non-active area, d. output leads coupled to said piezoresistive elements and directed through said apertures in said glass sheet.
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6. An electromechanical transducer for responding to the magnitude of an applied force, comprising:
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a. a semiconductor member having a depression of a predetermined depth located on a first surface thereof, b. at least one piezoresistive element diffused within said depression and located relatively centrally and comprising a given line configuration having a line width selected in accordance with said predetermined depth, c. a sheet of glass coupled to said semiconductor member for covering said depression to restrain said semiconductor material containing said element from moving beyond the position occupied by said sheet. - View Dependent Claims (7, 8, 9)
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10. An electromechanical transducer for responding to the magnitude of an applied force, comprising:
a. a semiconductor member having an H-shaped cross section with a top depression and a bottom depression, each of a predetermined depth and located relatively coaxially, one on a top surface and one on a bottom surface of said semiconductor, with the area between said depressions forming the central arm of said "H" to define an active region of a diaphragm adapted to deflect upon application of said force thereto, - View Dependent Claims (12, 14)
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11. b. at least one piezoresistive element diffused on said central arm of said "H" within said active area, said piezoresistive element comprising a serpentine line configuration of a line width relatively equal to the depth of said depressions,
c. first and second glass sheets, one secured to said top surface and one secured to said bottom surface to cover said depressions to form a barrier for restraining said diaphragm from deflecting beyond said glass sheets for all directions of forces applied to said top or bottom surfaces.
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13. Apparatus for use as a diaphragm with an integral stop for positioning pressure transducer elements thereon, comprising:
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a. a housing including a central depression of a relatively small depth on a surface thereof, said housing being of a U-shaped cross section with the area located between the arms of said "U" defining a diaphragm portion and being of a thickness for deflecting readily upon application of a pressure thereto, b. a layer of glass secured relatively congruent with said surface of said housing and bonded to the top portion of the arms of said U to cover said depression and to serve as a stop for deflections of said diaphragm exceeding the length of said arms. - View Dependent Claims (15)
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Specification