Miniature silicon condenser microphone
AssigneeKnowles Electronics, LLC
InventorsPeter V. Loeppert, David E. Schafer
Life of this patent
Estimating the term…
Abstract
A housing for shielding a transducer of the type mounted on a silicon die attached to a flexible circuit. The housing provides a jacket which protects the silicon die from physical damage. The jacket, in cooperation with the top and bottom cups, further provides a shield for the silicon die from light and electromagnetic interferences. An acoustic port located on the top portion of the jacket furnishes the means by which acoustic energy enters the jacket to contact the transducer. A back cavity, formed between the bottom cup and the silicon die, serves as the acoustic pressure reference which allows the microphone to function properly.
Claims38
A housing for shielding a transducer of the type mounted on a silicon die attached to a flexible circuit, said housing comprising:
- a jacket, said jacket having a longitudinal axis, a shell extending from a top portion, and an opening at an opposing end, said shell being substantially parallel to said longitudinal axis;
- a bottom cup, said bottom cup engaging an inner surface of said shell and said transducer wherein said transducer is fixed within said jacket, and said bottom cup having a light barrier and a sealing member, said light barrier being positioned adjacent said top portion, and said sealing member being positioned at said opening;
- and,
- a top cup, said top cup engaging said inner surface of said shell, and said top cup having an open end which mates with said light barrier, and a closed end.
A housing for shielding a transducer of the type mounted on a silicon die attached to a flexible circuit, said housing comprising:
- a jacket, said jacket having a longitudinal axis, a generally cylindrical shell extending from a top portion, and an opening at an opposing end, said generally cylindrical shell being substantially parallel to said longitudinal axis;
- a bottom cup, said bottom cup having a curved surface for engaging an inner surface of said generally cylindrical shell, a light barrier, and a sealing member, said light barrier being positioned adjacent said top portion, and said sealing member being positioned at said opening, said bottom cup engaging said silicon die wherein said bottom cup and said silicon die define a back cavity;
- and,
- a top cup, said top cup having a curved outer surface for engaging said inner surface of said generally cylindrical shell, an open end which mates with said light barrier, and a closed end, said closed end engaging said transducer wherein said transducer is fixed within said jacket.
A housing for shielding a transducer of the type mounted on a silicon die and connected to a flexible circuit, said housing comprising:
- a jacket, said jacket having a longitudinal axis, a generally cylindrical shell extending from a top portion, and an opening at an opposing end, said generally cylindrical shell being substantially parallel to said longitudinal axis, and said top portion including an acoustic input port;
- a bottom cup, said bottom cup having a curved surface for engaging an inner surface of said generally cylindrical shell, a light barrier, and a sealing member, said light barrier including a rim on an upper surface for engaging a lower surface of said top portion wherein a chamber is formed between said top portion and said light barrier through which an acoustic energy may travel, and said sealing member being positioned at said opening, said bottom cup engaging said silicon die wherein said bottom cup and said silicon die define a back cavity;
- and,
- a top cup, said top cup having a curved outer surface for engaging said inner surface of said generally cylindrical shell, an open end including a mating surface which engages an under side of said light barrier to form an optical baffle wherein said acoustic energy travels from said chamber through said optical baffle to contact said transducer, and a closed end which mates with said transducer wherein said transducer is fixed within said jacket.
A miniature silicon condenser microphone comprising;
- a transducer, said transducer being mounted on a silicon die and connected to a flexible circuit;
- and,
- a housing, said housing comprising, in combination,
- a jacket, said jacket having a longitudinal axis, a shell extending from a top portion, and an opening at an opposing end, said shell being substantially parallel to said longitudinal axis;
- a bottom cup, said bottom cup engaging an inner surface of said shell and said transducer wherein said transducer is fixed within said jacket, and said bottom cup having a light barrier, and a sealing member, said light barrier being positioned adjacent said top portion, and said sealing member being positioned at said opening;
- and,
- a top cup, said top cup engaging said inner surface of shell, and said top cup having an open end which mates with said light barrier, and a closed end.
Dependencies are inferred from the claim text.