Inductive acoustic filters for acoustic devices
AssigneeApple Inc.
InventorsAnthony D. Minervini, Peter C. Hrudey, Gokhan Hatipoglu
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Abstract
Aspects of the subject technology relate to inductive acoustic filters for acoustic devices. An inductive filter may include a substrate, an etched serpentine channel in a surface of the substrate and extending within the substrate from a first port in the substrate to a second port in the substrate. The inductive filter may also include a polymer cover layer adhesively attached to the surface of the substrate over the etched serpentine channel. The inductive filter may be positioned over an opening in a substrate of an acoustic module, such as a microphone module or a speaker module.
Claims26
A microphone module, comprising:
- a substrate;
- a cover mounted to the substrate and at least partially defining a back volume of the microphone module,
- a front volume that is separated from the back volume by a sound-responsive element and that is fluidly coupled to a first opening in the substrate;
- a non-porous membrane that defines a sealed volume that is fluidly coupled to the front volume via the first opening, and that provides a liquid-resistant seal between the front volume and a first environment external to the microphone module on a first side of the substrate;
- a second opening in the substrate that extends from the sealed volume defined by the non-porous membrane, through the substrate, to a second environment external to the microphone module on an opposing second side of the substrate;
- and
- an inductive filter disposed between at least a portion of the non-porous membrane and at least a portion of the substrate, the inductive filter having a first port coupled to the front volume, a second port coupled to the second opening in the substrate, and a serpentine fluid pathway from the first port to the second port.
A microphone module, comprising:
- a substrate;
- a cover mounted to the substrate and at least partially defining a back volume of the microphone module,
- a front volume that is separated from the back volume by a sound-responsive element and that is fluidly coupled to a first opening in the substrate;
- a non-porous membrane that defines a sealed volume that is fluidly coupled to the front volume via the first opening, and that provides a liquid-resistant seal between the front volume and a first environment external to the microphone module on a first side of the substrate;
- a second opening in the substrate that extends from the sealed volume defined by the non-porous membrane, through the substrate, to a second environment external to the microphone module on an opposing second side of the substrate;
- and
- an inductive filter at least partially defined in the substrate, the inductive filter having a first port coupled to the second opening, a second port coupled to the second environment, and a serpentine fluid pathway within the substrate from the first port to the second port.
An inductive acoustic filter, comprising:
- a substrate;
- an etched serpentine channel in a surface of the substrate and extending within the substrate from a first port in the substrate to a second port in the substrate, the etched serpentine channel comprising a plurality of switchback segments;
- and
- a polymer cover layer adhesively attached to the surface of the substrate over the etched serpentine channel.
Dependencies are inferred from the claim text.