Transducer glass bonding technique
First Claim
1. A method for bonding a glass tube to a glass surface of a transducer, comprising the steps of:
- applying a solvent-containing polyimide adhesive to a surface of said glass tube, said polyimide adhesive being at room temperature, or below when applied;
placing the adhesive applied surface of said glass tube onto the glass surface of said transducer to form a composite structure;
maintaining said composite structure at about room temperature or below, for a sufficiently long period of time to allow substantially all of the solvent to escape; and
thereafter raising the temperature of the composite structure to a temperature sufficient to cure the polyimide adhesive to realize a substantially void-free thermosetting bond.
3 Assignments
0 Petitions
Accused Products
Abstract
A polyimide adhesive is applied in liquid form between surfaces of a pressure transducer glass surface and a glass pedestal tube and maintained at room temperature, or below, for a period of 10-15 hours to allow the adhesive solvent to evaporate. After such time, the temperature of the transducer and attached pedestal tube is elevated over a period of time to about 320° C. to completely imidize the polyimide adhesive. The pedestal is then fixed within an opening in a base portion of a case, and electrical conductors are connected between pins in the case and transducer contacts. A cover is hermetically sealed to the case to thereby encase the transducer.
96 Citations
41 Claims
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1. A method for bonding a glass tube to a glass surface of a transducer, comprising the steps of:
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applying a solvent-containing polyimide adhesive to a surface of said glass tube, said polyimide adhesive being at room temperature, or below when applied; placing the adhesive applied surface of said glass tube onto the glass surface of said transducer to form a composite structure; maintaining said composite structure at about room temperature or below, for a sufficiently long period of time to allow substantially all of the solvent to escape; and thereafter raising the temperature of the composite structure to a temperature sufficient to cure the polyimide adhesive to realize a substantially void-free thermosetting bond. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for bonding a transducer having an apertured glass layer, to a glass tube, comprising the steps of:
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coating a surface of the glass tube for the transducer glass layer with a liquid polyimide adhesive; applying a predetermined pressure between the glass tube and the transducer glass layer so that a thin layer of said adhesive is formed; maintaining the thin polyimide layer at room temperature, or below, for a period of time sufficient to allow substantially all of an adhesive solvent to evaporate; and elevating a temperature of the transducer and attached glass tube such that complete imidizing of the polyimide adhesive occurs. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for fabricating a transducer device, comprising the steps of:
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coating at least one surface of a transducer assembly or a glass pedestal with an adhesive composition composed of the reaction product of 3, 3'"'"' -diaminobenzophenone and 3, 3'"'"', 4, 4'"'"' benzophenone tetra-carboxylic acid dianhydride; resting the pedestal upon the transducer assembly so that a thin layer of said adhesive is formed therebetween; maintaining the temperature of said adhesive at less than about 10°
C. for a period of about 10-15 hours for allowing substantially all of an adhesive solvent to evaporate from said polyimide adhesive;elevating the temperature of said transducer assembly and attached glass pedestal for a period of about 3-8 hours to a final temperature of greater than about 300°
C.;fixing said pedestal and attached transducer assembly to a base of a case; forming at least one fluid inlet to said case; bonding conductors between pins of said case and contact surfaces of said transducer assembly; and hermetically sealing a cover to the base of said transducer case. - View Dependent Claims (15, 16, 17, 18)
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19. A method for assembling a transducer structure, comprising the steps of:
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bonding a pedestal tube to a transducer assembly such that a channel is defined for communicating fluids to said transducer assembly; fixing the pedestal tube in a base portion of a case having electrical feed through pins; connecting conductors between said feed through pins and contact surfaces of said transducer assembly; and hermetically sealing a cover to said case for encasing said transducer assembly. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method for bonding a transducer assembly to a pedestal tube, comprising the steps of:
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applying a polyimide adhesive at room temperature or below, to a surface of said transducer assembly or to said pedestal tube; resting said pedestal tube on said transducer assembly to form a thin layer of said adhesive therebetween; maintaining said polyimide adhesive layer at said low room temperature or below until substantially all of an adhesive solvent has evaporated therefrom; and elevating the temperature of said adhesive layer sufficient to imidize said polyimide adhesive and securely bond said pedestal tube to said transducer assembly. - View Dependent Claims (30, 31, 32, 33)
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34. A method for assembling transducer parts together, comprising the steps of:
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applying a liquid polyimide adhesive to one or the other of a transducer chip and one end of a pedestal tube; placing the parts together by butting the one end of the pedestal tube against a planar surface of the transducer chip while the polyimide adhesive is yet a liquid so that a fillet of the adhesive is formed on a sidewall of the other of the chip or tube; allowing the polyimide adhesive to remain at a low temperature until a solvent therein is substantially removed; and elevating the temperature so that imidizing of the polyimide occurs. - View Dependent Claims (35, 36, 37, 38)
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39. A transducer structure, comprising:
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a transducer assembly having an apertured face; a pedestal tube mounted to said transducer assembly face so as to provide a fluid channel to said aperture; and a polyimide adhesive film between said pedestal tube and said transducer assembly, said adhesive film being less than about 0.3 mil in thickness. - View Dependent Claims (40, 41)
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Specification