Semiconductor pressure transducer
First Claim
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1. A semiconductor pressure transducer comprising:
- a base comprising a semiconductor monocrystal;
a strain gauge resistor element formed on said base;
an oxide film formed on said base in contact with said strain gauge resistor element for protecting said strain gauge resistor element; and
a conductive layer formed on said oxide film, said layer not overlapping said strain gauge resistor element through said oxide film, being adjacent two opposed sides of said strain gauge element and functioning to cause movable ions within and on the oxide film in proximity to the strain gauge resistor element to be fixed.
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Abstract
In a semiconductor pressure transducer in accordance with the present invention, an oxide film is formed on a semiconductor base having a strain gauge resistor element for the purpose of protecting the strain gauge resistor element. Over the oxide film, a conductive metal film is formed which does not overlap with the strain gauge resistor element through said oxide film.
27 Citations
15 Claims
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1. A semiconductor pressure transducer comprising:
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a base comprising a semiconductor monocrystal; a strain gauge resistor element formed on said base; an oxide film formed on said base in contact with said strain gauge resistor element for protecting said strain gauge resistor element; and a conductive layer formed on said oxide film, said layer not overlapping said strain gauge resistor element through said oxide film, being adjacent two opposed sides of said strain gauge element and functioning to cause movable ions within and on the oxide film in proximity to the strain gauge resistor element to be fixed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A semiconductor pressure transducer comprising:
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a base comprising a n-type silicon monocrystal having a thin strain causing portion on a central part and a thick fixed portion on an exterior periphery; a p-type strain gauge resistor element formed in said strain causing portion; an oxide film formed on said base in contact with said strain gauge resistor element for protecting said strain gauge resistor element; aluminum wiring formed on said oxide film for outputting the output of said strain gauge resistor element; and a conductive layer formed on said oxide film, said layer not overlapping said strain gauge resistor element through said oxide film, being adjacent two opposed sides of said strain gauge resistor element and functioning to cause movable ions within and on the oxide film in proximity to the strain gauge resistor element to be fixed. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification