Transducer device

• US 4,691,363 A
• Filed: 12/11/1985
• Issued: 09/01/1987
• Est. Priority Date: 12/11/1985
• Status: Expired due to Term

• Current Assignee: AT&T Information Systems Inc. (AT&T, Inc.)
• Original Assignee: AMERICAN TELEPHONE & TELEGRAPH COMPANY, AT&T INFORMATION SYSTEMS INC.
• Inventors: Khanna, Satya P.
• Primary Examiner(s): Rubinson, Gene Z.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/807,636
• Time in Patent Office: 629 Days
• Field of Search: 381/91, 381/87, 381/113, 381/88, 381/205, 381/188, 381/191, 179/146 E, 179/111 E, 361/421, 361/403, 361/400, 361/405
• US Class Current: 381/394
• CPC Class Codes: H04R 1/04 Structural association of microphone with electric circuitry therefor in deaf-aid sets H04R25/00

Abstract

A silicon micro-transmitter chip is housed within top and bottom closures snap-fitted together by legs and catches on the two closures. The chip is mounted between two acoustic cavities in the closures by a plate part of a configured metal sheet having other strip parts extending through grooves in the bottom closure to its outside where the strips are bent to provide arms for surface mounting the entire device on a printed wiring board. The sheet serves both as a continuous strap for effecting such surface mounting and as an electrode for connecting a terminal of the chip to ground. Other terminals of the chip are connectable to the board by flat leads passing through other grooves in the bottom closure to its outside where they are bent for surface mounting purposes. The housing formed by the two closures includes an adhesive impregnated gasket for providing an acoustic seal between the two cavities as to which the air pressures therein are equalized by a vent hole in the plate.

Claims

1. A transducer device comprising:

a silicon microtransmitter chip, a housing for said chip comprising top and bottom transversely-displaced insulative closures having their front ends in registration at an interface between them in a transversely central region of said housing, and having respective acoustic cavities extending rearwardly thereinto from their front ends, said closures at their front ends having respective end surfaces facing towards each other and extending around the respective acoustic cavities formed in said closures and separated from each other by a discontinuity between them providing said interface between said closures, said top closure having a sound port formed in the top thereof to communicate with the cavity therein, chip-mounting means mounting said chip in said region in longitudinally and laterally centralized relation in said housing so that said chip is between said cavities, and closure coupling means comprising parts integral with, respectively, said top closure and bottom closure and snap-fittable together to lock said closures together in predetermined fixed relation and to cause said end surfaces to be in flush pressure engagement with each other at said interface when said closures are locked together by said closure coupling means.

2. A device according to claim 1 in which a first of said end surfaces of a first of said closures has aperturing to provide passage through such closure from the inside to the outside of said housing, and in which said chip-mounting means comprises a metallic sheet having, as integral parts thereof, a plate in said housing mounting said chip, and an extension part of said sheet extending longitudinally from one end of such plate, said extension part of said sheet being seated in said aperturing to hold said plate positioned in said housing.

3. A device according to claim 2 in which said extension part of said sheet passes through said aperturing to the outside of said housing and, outside it, is bent so as to comprise downwardly extending arm means and outwardly extending arm means of which the latter is adapted to be bonded to metallic material on a printed wiring board to surface mount said device on said board.

4. A device according to claim 3 in which said plate is adapted upon bonding of said downwardly extending arm means to said material to provide an electrical ground plane for said chip.

5. A device according to claim 3 in which said aperturing comprises a plurality of grooves formed in said first end surfaces, and in which said extension part of said sheet comprises a plurality of flat metal strips of which each passes through a respective one of said grooves.

6. A device according to claim 2 in which said plate part of said sheet is dished to form a central concavity in said plate, and in which said chip is seated in said concavity and is adhesively bonded to said plate.

7. A device according to claim 6 in which said plate has formed therein within said concavity a hole extending through said plate to acoustically couple said chip with the acoustic cavity in said bottom closure.

8. A device according to claim 2 in which said first closure has at its front end a gasket seat disposed inwardly of the front end surface of said first closure and extending around the front-end opening of the acoustic cavity formed in such closure, and in which said device further comprises a ring gasket seated on said seat so that the inner rim of said gasket underlies and contacts the outer edge of said plate.

9. A device according to claim 8 in which said gasket includes adhesive material by which said gasket is adhesively bonded both to said seat and to said outer edge of said plate so as to adhesively fasten said sheet to said first closure.

10. A device according to claim 8 in which said plate and chip cover the acoustic cavity in said first closure to provide a barrier to air flow between that cavity and the acoustic cavity in said second closure, and in which said plate has formed therein a vent hole disposed between said chip and the outer edge of said plate and adapted by air flow therethrough to equalize the respective air pressures in such two acoustic cavities.

11. A device according to claim 1 in which said closure coupling means comprises a plurality of outwardly deflectable resilient legs extending transversely from a first of said closures beyond the front end thereof to overlap with the outside of the second of said closures, and a plurality of catches on the outside of said second closure and adapted by snap-fitting with said legs to releasably lock such closures together in predetermined fixed relation.

12. A transducer device comprising, a silicon micro-transmitter chip, a housing having a hollow interior and a transversely displaced top and bottom and having at its top a sound port permitting sound waves to enter said interior, said housing having in a transversely central region thereof and on one longitudinal side thereof a passage therethrough from the inside to the outside of said housing, and metallic sheet means extending through said passage so as to have a part inside and a part outside said housing, such inside part mounting said chip in said interior to be disposed between and in acoustic communication with upper and lower acoustic cavities provided by said interior, and said outside part of said sheet means being bent so as to comprise a downwardly extending arm portion and an outwardly extending arm portion of which the latter is adapted to be bonded to metallic material on a printed wiring board so as both to surface mount said device on said board and to provide an electrical ground plane for said chip.

13. A device according to claim 12 in which said housing has formed in the other longitudinal side thereof a plurality of passages extending therethrough from the inside to the outside of said housing, and in which said device further comprises a plurality of flat strip leads of which each extends through a respective one of said passages and has a part inside and a part outside said housing, and which the outside part of each such lead is bent to have a downwardly extending arm portion and an outwardly extending arm portion of which the latter is adapted to be bonded to metallic material on a said board to contribute to the surface mounting of said device thereon, said device further comprising a plurality of conductors in said interior and connecting the inside parts of said sheet means and said leads to terminals on said chip.

14. A surface mountable electronic component device comprising, an insulative housing for said device and having a top and a bottom, said housing have aperturing therein disposed intermediate its top and bottom and providing passage on longitudinally opposite sides of said housing between the inside and outside thereof, electronic means in said housing, and a longitudinally elongated metallic means extending through said aperturing to have a part thereof inside said housing and parts thereof disposed outside said housing on, respectively, one and the other of said longitudinally opposite sides of said housing, such outside parts being joined with said inside part in a continuous strap and being respectively shaped to be bondable to metallic material at respective longitudinally spaced locations on a printed wiring board to surface mount such device on such board.

15. A device according to claim 14 in which said inside part of said metallic means mounts said electronic means and is electrically connected thereto.

16. An electronic component device comprising, a housing for said device comprising top and bottom transversely displaced insulative closures having their front ends in registration at an interface between them, said closures on longitudinally opposite sides of said housing being non-overlapping with each other in the transverse direction, electronic means in said housing, a plurality of electrical leads electrically connected to such means on the inside of said housing and passing therethrough on longitudinally opposite sides thereof to the outside thereof, and separate closure coupling means on laterally opposite sides of said housing and each comprising a set of cooperable parts integral with, respectively, said top closure and bottom closure, at least one part in each of such sets being outwardly resiliently deflectable relative to the one of said closures with which such part is integral so as to cause the parts in each of such sets to be snap-fittable together to lock said closures together in predetermined fixed translational and angular relation relative to each other.

17. A device according to claim 16 in which said separate closure coupling means comprise first and second leg means integral with one of said closures and on laterally opposite sides thereof and extending transversely to overlap with the outside of the other of said closures in close laterally fitting relation therewith, first and second catch means integral with said other closure and on laterally opposite sides thereof and adapted by latching with, respectively, said first and second leg means to snap-fit said closures together so as to produce pressure engagement therebetween at their interface, and guide means integral with and on the outside of said other closure and cooperable with at least one of said first and second leg means to preclude significant longitudinal misalignment of said top and bottom closures when snap-fitted together.