Stress sensor apparatus
First Claim
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1. A stress sensing unit comprising:
- a semiconductor material stress sensor having a first surface, said stress sensor having structural portions including substantially in a crystalline relationship a diaphragm and a constraint for constraining said diaphragm at peripheral portions thereof with said diaphragm portion being formed by a recess in said semiconductor material stress sensor which opens onto said first surface resulting in an outline of said recess in said first surface where said first surface is formed by said constraint portions; and
a mounting structure of a material of another kind from that in said semiconductor material stress sensor, said mounting structure being bonded to said semiconductor material stress sensor at bonded surfaces in said first surface contained within a closed surface band in turn contained within said first surface to thereby form a bond, said surface band having an inner outline everywhere substantially equidistant from said recess outline and having an outer outline also everywhere substantially equidistant from said recess outline with said inner and outer outlines being separated just enough to include that bonded surface portion having maximum extent perpendicular to said inner and outer outlines.
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Abstract
Semiconductor material stress sensors are provided where the sensing resistors therein have good electrical stability while being sufficiently protected without degrading sensor performance. This is accomplished through control of the locations of the maximum concentrations of the resistor dopant. The mounting of semiconductor stress sensors on mounts of a different material type in a manner minimizing offset temperature shifts is disclosed.
32 Citations
44 Claims
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1. A stress sensing unit comprising:
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a semiconductor material stress sensor having a first surface, said stress sensor having structural portions including substantially in a crystalline relationship a diaphragm and a constraint for constraining said diaphragm at peripheral portions thereof with said diaphragm portion being formed by a recess in said semiconductor material stress sensor which opens onto said first surface resulting in an outline of said recess in said first surface where said first surface is formed by said constraint portions; and a mounting structure of a material of another kind from that in said semiconductor material stress sensor, said mounting structure being bonded to said semiconductor material stress sensor at bonded surfaces in said first surface contained within a closed surface band in turn contained within said first surface to thereby form a bond, said surface band having an inner outline everywhere substantially equidistant from said recess outline and having an outer outline also everywhere substantially equidistant from said recess outline with said inner and outer outlines being separated just enough to include that bonded surface portion having maximum extent perpendicular to said inner and outer outlines. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 38)
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24. A stress sensing unit comprising:
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A semiconductor material stress sensor having a first surface, said stress sensor having structural portions including substantially a diaphragm and a constraint for constraining said diaphragm at peripheral portions thereof with said diaphragm portion being formed by a recess in said semiconductor material stress sensor which opens onto said first surface resulting in an outline of said recess in said first surface where said first surface is formed by said constraint portions; and a mounting structure of a material of another kind from that in said semiconductor material stress sensor, said mounting structure being bonded to said semiconductor material stress sensor at bonded surfaces in said first surface contained within a closed surface band in turn contained within said first surface to thereby form a bond, said surface band having an inner outline everywhere substantially equidistant from said recess outline and having an outer outline also everywhere substantially equidistant from said recess outline with said inner and outer outlines being separated just enough to include that bonded surface portion having maximum extent perpendicular to said inner and outer outlines and said surface band being in a location in said first surface such that said stress sensing unit has approximately its smallest offset shift with temperature. - View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 39, 40, 41, 42, 43, 44)
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Specification