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US 2013/0095897 A1Published application
Electromagnetic shielding and an acoustic chamber for a microphone in a mobile electronic device
AssigneeResearch In Motion Limited
InventorWolfgang EDELER
Life of this patent
Estimating the term…
Abstract
A circuit board in a mobile electronic device has a microphone and related amplifier and signal conditioning circuitry mounted thereon. A radio frequency (RF) shield surrounds and isolates the microphone from electromagnetic interference (EMI). The RF shield together with the circuit board forms an acoustic chamber surrounding the microphone. A hole in the RF shield permits acoustic energy to enter the acoustic chamber and reach the microphone.
Claims25
A mobile electronic device, comprising:
- a housing having an opening for entry of acoustic energy into said housing;
- radio frequency ‘RF’ circuitry secured inside said housing and capable of producing electromagnetic emission;
- a circuit board secured inside said housing;
- an audio system comprising a microphone mounted on said circuit board;
- a radio frequency ‘RF’ shield that is mechanically and electrically coupled to said circuit board and surrounds said microphone, said RF shield to provide some electromagnetic interference ‘EMI’ isolation for said microphone from at least said electromagnetic emission;
- an acoustic chamber surrounding said microphone, said acoustic chamber enclosed within said RF shield and bounded by said circuit board, wherein said RF shield has an opening to permit said acoustic energy to enter said acoustic chamber and wherein said acoustic energy, after entering said acoustic chamber through said opening in said RF shield, is able to propagate throughout said acoustic chamber;
- and
- an acoustic coupler to conduct said acoustic energy from said opening in said housing to said opening in said RF shield,
- wherein dimensions of said acoustic chamber are selected to achieve acoustical properties of said audio system at predefined values or within a predefined range.
6 more elements
An electromagnetic shielded audio system, comprising:
- a circuit board;
- a microphone mounted on said circuit board;
- and
- a radio frequency ‘RF’ shield that is mechanically and electrically coupled to said circuit board and surrounds said microphone, said RF shield to provide some electromagnetic interference ‘EMI’ isolation for said microphone;
- and
- an acoustic chamber surrounding said microphone, said acoustic chamber enclosed within said RF shield and bounded by said circuit board,
- wherein said RF shield has an opening to permit acoustic energy from outside of said chamber to enter said acoustic chamber and wherein acoustic energy, after entering said acoustic chamber through said opening, is able to propagate throughout said acoustic chamber, and
- wherein dimensions of said acoustic chamber are selected to achieve acoustical properties of said audio system at predefined values or within a predefined range.
5 more elements
Dependencies are inferred from the claim text.