Method of manufacturing integral transducer assemblies employing built-in pressure limiting
First Claim
Patent Images
1. A method for fabricating a semiconductor transducer, comprising the steps of:
- a. forming a first depression on a first surface in a semiconductor wafer, said depression as formed being of a predetermined depth and having a plurality of "finger-like" projections extending from the periphery,b. diffusing a serpentine piezoresistor within said depression and having a resistance line width approximately equal to said predetermined depth,c. metallizing the surface of said depression to form a series of terminal areas extending into said projections,d. covering said depression with a glass sheet,e. bonding leads to said terminal areas within said projections.
0 Assignments
0 Petitions
Accused Products
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.
45 Citations
6 Claims
-
1. A method for fabricating a semiconductor transducer, comprising the steps of:
-
a. forming a first depression on a first surface in a semiconductor wafer, said depression as formed being of a predetermined depth and having a plurality of "finger-like" projections extending from the periphery, b. diffusing a serpentine piezoresistor within said depression and having a resistance line width approximately equal to said predetermined depth, c. metallizing the surface of said depression to form a series of terminal areas extending into said projections, d. covering said depression with a glass sheet, e. bonding leads to said terminal areas within said projections. - View Dependent Claims (2, 3, 4, 5, 6)
-
Specification