Pressure sensor
First Claim
1. A method of producing a differential pressure sensor comprising:
- fabricating a plurality of sensor die sites on a semiconductor wafer,forming first and second wafer scale seals on each of the sensor die sites, the first and second wafer scale seal being formed on first and second surfaces of each of the sensor die sites,providing each of the sensor die sites with die electrical output pads,singularizing the plurality of sensor die sites to provide a plurality of singularized die sites, each singularized die site representing a sensor die comprising one of the sensor die sites with its respective first and second wafer scale seals, die electrical output pads, and first and second surfaces, andproviding a sensor die support member and a top cover to the sensor die, wherein the sensor die support member has a support member fluid access port with a support member port perimeter and the top cover has a top cover fluid access port having a top cover port perimeter and wherein the first and second wafer scale seals on the sensor die fully seal the first and second surfaces of the sensor die around the support member port perimeter and around the top cover port perimeter.
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Accused Products
Abstract
A differential pressure sensor includes a micro-electromechanical sensor die fabricated as a plurality of sensor die sites on a semiconductor wafer, and then singularized, the sensor die having a top face surface including die electrical output pads exposed to a first test fluid source and a bottom side surface exposed to a second test fluid source. The differential pressure further has a sensor die support member having a die support member fluid access port with a support member port perimeter; wherein one of the top face surface or the bottom side surface is sealed fully around the support member port perimeter by a wafer scale seal formed on the plurality of sensor die sites before die singulation. Wafer scale seals may be formed by a photofabrication process, screen printing, stamp printing, or pressure transfer printing. Some embodiments may include a photofabricated seal formed by a photosensitive polydimethylsiloxane material, by a filled photofabricated mold, and by photopatterned glass frit.
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Citations
51 Claims
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1. A method of producing a differential pressure sensor comprising:
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fabricating a plurality of sensor die sites on a semiconductor wafer, forming first and second wafer scale seals on each of the sensor die sites, the first and second wafer scale seal being formed on first and second surfaces of each of the sensor die sites, providing each of the sensor die sites with die electrical output pads, singularizing the plurality of sensor die sites to provide a plurality of singularized die sites, each singularized die site representing a sensor die comprising one of the sensor die sites with its respective first and second wafer scale seals, die electrical output pads, and first and second surfaces, and providing a sensor die support member and a top cover to the sensor die, wherein the sensor die support member has a support member fluid access port with a support member port perimeter and the top cover has a top cover fluid access port having a top cover port perimeter and wherein the first and second wafer scale seals on the sensor die fully seal the first and second surfaces of the sensor die around the support member port perimeter and around the top cover port perimeter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 28, 29, 37, 38, 39, 40, 41, 42, 46, 47)
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13. A method of producing a differential pressure sensor comprising:
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fabricating a plurality of sensor die sites on a semiconductor wafer, forming a first wafer scale seal on each of the sensor die sites, the first wafer scale seal being formed on one of a first or second surface of each of the sensor die sites, providing each of the sensor die sites with die electrical output pads, singularizing the plurality of sensor die sites to provide a plurality of singularized die sites, each singularized die site representing a sensor die comprising one of the sensor die sites with its respective first wafer scale seal, die electrical output pads, and first and second surfaces, providing a sensor die support member to the sensor die, wherein the sensor die support member has a support member fluid access having a support member port perimeter and wherein the first wafer scale seal on the sensor die fully seals the one of the first or second surface of the sensor die sites around the support member port perimeter, and providing a top cover for the sensor die after providing the sensor die support member and applying an applied-in-place seal on the sensor die or top cover before providing the top cover to the sensor die, wherein the top cover has a top cover fluid access port which has a top cover port perimeter, and wherein the applied-in-place seal fully seals the other of the first or second surface of the sensor die sites around the top cover port perimeter. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 30, 31, 32, 33, 34, 35, 36, 48, 49)
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43. A method of producing a differential pressure sensor comprising:
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fabricating a plurality of sensor die sites on a semiconductor wafer, the sensor die sites each having a first and second surface, forming first and second wafer scale seals on each of the sensor die sites, providing a first surface of each of the sensor die sites with die electrical output pads, singularizing the plurality of sensor die sites to provide a plurality of singularized die sites, each singularized die site representing a sensor die comprising one of the sensor die sites with its respective first and second wafer scale seals, die electrical output pads, and first and second surfaces, providing a rigid outer sensor case having a sensor cavity formed by a sensor cavity wall enclosure having an interior wall surface adapted to receive the sensor die, wherein the rigid outer sensor case has first and second test fluid access ports formed through the sensor cavity wall enclosure and having first and second openings in the interior wall surface, respectively, the first and second openings having first and second access port inner perimeters, respectively, and wherein the first and second wafer scale seals are adapted to seal the first and second surfaces of the sensor die fully around the first and second access port inner perimeters, and wherein the sensor cavity is dimensioned so as to ensure contact between the first and second wafer scale seals and the first and second test fluid access ports, respectively. - View Dependent Claims (44, 45, 50, 51)
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Specification