Pressure sensor
First Claim
1. A pressure sensor for sensing pressure comprising:
- a sensor element formed of a semiconductor element having a piezoresistance effect;
a base plate for mounting said sensor element;
a holder to which said sensor element is airtightly fixed using said base plate;
a pressure case to which said holder is airtightly fixed, said pressure case having an electromagnetic shield function and forming a reference pressure space by covering said sensor element; and
a housing having a pressure introducing hole supporting said holder, wherein said base plate has a collar portion which is connected by welding to said holder.
1 Assignment
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Accused Products
Abstract
A pressure sensor 1 comprises a metallic housing 10 having a space 18 communicated to a pressure detection space and a thin rising portion 17 formed on the upper end of the peripheral area, a sensor element 20, a sensor element holder 30, a metallic pressure case 60 having a ceiling portion 61, and a connector case 70 formed of an insulating material, wherein a collar portion 211 of a base plate 21 of the sensor element 20 including a pressure sensing element 22 is contacted to an annular protrusion 33 positioned around the opening 32 of the sensor element holder 30, and the collar portion 211 is airtightly welded to the annular protrusion 33 by projection welding. Further, the collar portion 63 on the pressure case 60 and the peak surface 35 of the holder 30 is airtightly welded by an electron beam welding. The airtight interior space defined by the sensor element 20, the sensor element holder 30 and the pressure case 60 is utilized as the reference pressure space.
54 Citations
33 Claims
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1. A pressure sensor for sensing pressure comprising:
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a sensor element formed of a semiconductor element having a piezoresistance effect;
a base plate for mounting said sensor element;
a holder to which said sensor element is airtightly fixed using said base plate;
a pressure case to which said holder is airtightly fixed, said pressure case having an electromagnetic shield function and forming a reference pressure space by covering said sensor element; and
a housing having a pressure introducing hole supporting said holder, wherein said base plate has a collar portion which is connected by welding to said holder. - View Dependent Claims (2, 3, 4, 5, 6, 13, 14)
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7. A pressure sensor comprising:
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a housing having a pressure introducing hole;
a sensor element formed of a semiconductor element having a piezoresistance effect;
a holder to which said sensor element is fixed; and
a pressure case having a ceiling portion, said sensor element, said holder and said pressure case being welded air tightly together to form a reference pressure space, wherein said sensor element is formed by mounting said semiconductor element on a metallic base plate having a first collar portion through an upper base and a lower base, said holder includes an opening formed in a center portion thereof, an annular protrusion positioned surrounding said opening at a lower surface thereof, and a flat surface formed on a peak surface of a rising portion formed around said holder, said pressure case includes a second collar portion where a lower end of a surrounding wall hanging from said ceiling portion is bent outwardly, said base plate of said sensor element is welded and fixed airtightly to said annular protrusion of said holder, and said second collar portion of said pressure case is welded and fixed airtightly to said peak surface of said holder. - View Dependent Claims (8, 9)
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10. A pressure sensor comprising:
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a metallic housing having a pressure introducing hole;
a sensor element formed of a semiconductor element having a piezoresistance effect;
a holder to which said sensor element is airtightly fixed; and
a metallic pressure case having a ceiling portion, said sensor element, said holder and said pressure case being welded airtightly together to form a reference pressure space, wherein said sensor element is formed by mounting said semiconductor element on a metallic base plate having a first collar portion through an upper base and a lower base, said holder comprises an interior space, an opening formed in a center portion thereof, an annular protrusion positioned surrounding said opening at a lower surface thereof, and a flat surface formed on a peak surface of the rising portion formed around said holder, said pressure case comprises a second collar portion where a lower end of a surrounding wall hanging from a peripheral of said ceiling portion is bent outwardly, said base plate is welded and fixed airtightly to said annular protrusion of said holder, and said second collar portion of said pressure case is welded and fixed airtightly to said peak surface of said holder. - View Dependent Claims (11, 12)
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15. A pressure sensor comprising:
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a sensor element formed of a semiconductor element having a piezoresistance effect, said sensor element being mounted on a base plate;
a housing for introducing pressure to said sensor element; and
a holder for airtightly supporting said sensor element, said holder being supported by said housing, wherein said base plate has a collar portion which is connected by welding to said holder. - View Dependent Claims (16, 17, 18)
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19. A pressure sensor comprising:
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a sensor element formed of a pressure sensing element, a base, and a base plate;
a holder for supporting said sensor element; and
a housing for supporting said holder, said housing having a pressure introducing hole, wherein said base plate of said sensor element is welded airtightly to said holder, and said base plate has a collar portion which is connected by welding to said holder. - View Dependent Claims (20, 21, 22)
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23. A pressure sensor comprising:
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a housing having a pressure introducing hole;
a sensor element having a pressure sensing element; and
a holder for supporting said sensor element, wherein said sensor element is formed by mounting said semiconductor element on a metallic base plate having a collar portion through an upper base and a lower base, said holder comprises an opening formed in a center portion thereof and an annular protrusion positioned surrounding said opening at a lower surface thereof, and said base plate of said sensor element is welded and fixed airtightly to said annular protrusion of said holder.
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24. A pressure sensor comprising:
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a sensor element formed of a pressure sensing element, a base and a base plate; and
a holder for supporting said sensor element, wherein said base plate has a collar portion which is connected by welding to said holder, said base plate of said sensor element is welded and fixed airtightly to said holder, said holder is welded and fixed airtightly to a pressure case having an electromagnetic shield function and forming a reference pressure space by covering said sensor element, said holder being further supported by a housing having a pressure introducing hole. - View Dependent Claims (25, 26, 27, 32, 33)
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28. A pressure sensor comprising:
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a housing having a pressure introducing hole;
a sensor element having a pressure sensing element formed of a semiconductor element;
a holder to which said sensor element is fixed; and
a pressure case having a ceiling portion, said sensor element, said holder and said pressure case being welded airtightly together to form a reference pressure space, wherein said sensor element is formed by mounting said semiconductor element on a metallic base plate having a first collar portion through an upper base and a lower base, said holder comprises an opening formed in a center portion thereof, an annular protrusion positioned surrounding said opening at a lower surface thereof, and a flat surface formed on a upper surface thereof, said pressure case comprises a second collar portion where a lower end of a surrounding wall hanging from said ceiling portion is bent outwardly, and an annular protrusion is formed on a surface opposing said holder, said base plate of said sensor element is welded and fixed airtightly to said annular protrusion of said holder, and said annular protrusion formed on a second collar portion of said pressure case is welded and fixed airtightly to said flat surface of said holder.
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29. A pressure sensor comprising:
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a housing having a pressure introducing hole;
a sensor element having a pressure sensing element formed of a semiconductor element;
a holder for supporting said sensor element; and
a pressure case having a ceiling portion, said sensor element, said holder and said pressure case being welded airtightly together to form a reference pressure space, wherein said sensor element is formed by mounting said semiconductor element on a metallic plate having a first collar portion through an upper base and a lower base, said holder comprises an opening formed on a center portion thereof, an annular protrusion positioned surrounding said opening at a lower surface thereof, and an annular protrusion positioned opposing said pressure case, said pressure case comprises a second collar portion where a lower end of a surrounding wall hanging from a peripheral of said ceiling portion is bent outwardly, said base plate of said sensor element is welded and fixed airtightly to said annular protrusion positioned on a lower surface of said holder, and said second collar portion of said pressure case is welded and fixed airtightly to said annular protrusion on said holder positioned opposing said pressure case. - View Dependent Claims (30, 31)
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Specification