INTEGRATED ACOUSTIC HORN AND LEAD FRAME

• US 20110103632A1
• Filed: 10/30/2009
• Published: 05/05/2011
• Est. Priority Date: 10/30/2009
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies Wireless IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Leclair, Timothy, Goel, Atul
• Application Number:
  US12/609,176
• Publication Number:
  US 20110103632A1
• Time in Patent Office: Days
• US Class Current: 381/340
• CPC Class Codes: H01L 2224/45124 Aluminium (Al) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/1461 MEMS
• CPC Class Codes: H01L 2924/3011 Impedance
• CPC Class Codes: H04R 1/30 Combinations of transducers with horns, e.g. with mechanical matching means , i.e. front-loaded hornshorns in general G10K; transducer enclosures or mountings using a back-loaded horn H04R1/2861; application of horns as guiding means to obtain a predetermined directivity characteristic H04R1/345

Abstract

A device for manipulating acoustic signals includes a transducer die and a horn. The transducer die is attached to a lead frame and configured to convert between electrical energy and the acoustic signals, the transducer die having a transducer membrane. The horn is integrally connected with the lead frame, the horn extending from the lead frame and having a throat positioned adjacent to the transducer membrane and a mouth opening at an opposite end of the horn from the throat.

Claims

1. A device for manipulating acoustic signals, the device comprising:

a transducer die attached to a lead frame and configured to convert between electrical energy and the acoustic signals, the transducer die comprising a transducer membrane; and

a horn integrally connected with the lead frame, the horn extending from the lead frame and comprising a throat positioned adjacent to the transducer membrane and a mouth opening at an opposite end of the horn from the throat.

2. The device of claim 1, wherein the transducer die comprises a micro electro-mechanical system (MEMS) transducer.

3. The device of claim 1, wherein the transducer die is attached to a top surface of the lead frame and the horn extends from a bottom surface of the lead frame, the lead frame defining an aperture between the transducer membrane and the throat of the horn.

4. The device of claim 3, further comprising:

a lid connected to the top surface of the lead frame, the lid and a base portion of the horn defining a cavity, wherein the transducer die is positioned within the cavity.

5. The device of claim 4, wherein the cavity is hermetically sealed.

6. The device of claim 1, wherein the horn comprises plastic transfer molded through a portion of the lead frame and extending from the lead frame to the mouth of the horn.

7. The device of claim 6, wherein at least a portion of a cross-section of the horn has a widening shape.

8. The device of claim 6, wherein the molded plastic comprises at least one of liquid crystal polymer (LCP), polybutylene terephthalate (PBT), polypropylene (PP), polyphthalamide (PPA).

9. The device of claim 6, wherein the lead frame defines at least one port through which the transfer molded plastic extends, knitting together the lead frame and the horn.

10. The device of claim 1, wherein the transducer die comprises at least one contact pad connected to the lead frame via at least one corresponding bonding wire.

11. The device of claim 1, further comprising:

a screen covering the mouth of the horn and configured to protect the transducer die from at least one of debris, contaminates, and moisture.

12. A device comprising:

a lead frame;

an acoustic horn comprising a base portion integrated with the lead frame and a protruding portion extending from the lead frame, the acoustic horn defining a first aperture corresponding to a horn throat and a second aperture corresponding to a horn mouth; and

an transducer die positioned on the lead frame adjacent to the first aperture of the acoustic horn, and configured to convert between electrical energy and acoustic signals, wherein the acoustic horn adjusts a radiation pattern of the acoustic signals.

13. The device of claim 12, wherein the transducer die comprises a micro electro-mechanical system (MEMS) transducer.

14. The device of claim 12, further comprising:

a lid connected to the base portion of the acoustic horn and defining a cavity between an inner surface of the lid and a top surface of the base portion, the transducer die being positioned within the cavity.

15. The device of claim 14, wherein the first aperture has a smaller diameter than the second aperture.

16. The device of claim 14, further comprising:

a screen covering the second aperture of the acoustic horn and configured to protect the transducer die from at least one of debris, contaminates and moisture.

17. A packaged semiconductor device comprising:

a lead frame defining an aperture;

a transfer molded acoustic horn comprising a base portion integrated with the lead frame and a protruding portion extending from the lead frame, a throat of the acoustic horn being substantially aligned with the aperture of the lead frame;

a lid connected to the integrated acoustic horn and lead frame to form a cavity; and

a transducer die positioned in the cavity on the lead frame, the transducer die comprising a micro electro-mechanical system (MEMS) transducer configured to convert between electrical energy and acoustic signals, the MEMS transducer having a membrane and a back-etched portion substantially aligned with the aperture of the lead frame and the throat of the acoustic horn.

18. The device of claim 17, wherein the acoustic horn adjusts a radiation pattern of the acoustic signals.

19. The device of claim 17, wherein the acoustic horn provides impedance matching for the acoustic signals.

20. The device of claim 17, further comprising:

a screen covering a mouth of the acoustic horn, opposite the throat of the acoustic horn, the screen protecting the transducer die from at least one of debris, contaminates and moisture.