Impulse pressure rejecting valve for an electronic device
A portable electronic device comprising: an enclosure having an enclosure wall that forms an interior chamber and a sound output port to an ambient environment; a speaker positioned within the interior chamber, the speaker having a front volume chamber coupling a sound output surface of the speaker to the sound output port and a back volume chamber acoustically coupled to the interior chamber by an aperiodic vent; and a valve operable to open and close the aperiodic vent in response to a pressure change.
1. A portable electronic device comprising:
an enclosure having an enclosure wall that forms an interior chamber and a sound output port to an ambient environment;
a speaker positioned within the interior chamber, the speaker having a front volume chamber coupling a sound output surface of the speaker to the sound output port and a back volume chamber acoustically coupled to the interior chamber by an aperiodic vent; and
a valve operable to transition between an open position and a closed position in response to a pressure change, and wherein the aperiodic vent is formed in the valve.
2. The portable electronic device of claim 1 wherein the pressure change is a pressure increase in the interior chamber above a pressure in the back volume chamber, or a pressure decrease in the interior chamber below a pressure in the back volume chamber.
3. The portable electronic device of claim 2 wherein the pressure increase or the pressure decrease causes the valve to transition to the closed position and close the aperiodic vent to prevent the pressure increase or the pressure decrease from causing a vibration of the sound output surface of the speaker.
4. The portable electronic device of claim 2 wherein the pressure increase or the pressure decrease is caused by an external force applied to, or removed from, the enclosure wall.
5. The portable electronic device of claim 1 wherein the pressure change is a pressure equalization between the back volume chamber and the interior chamber, and the pressure equalization causes the valve to transition to the open position and open the aperiodic vent to allow fluid flow between the back volume chamber and the interior chamber.
6. The portable electronic device of claim 5 wherein the pressure equalization occurs through the aperiodic vent.
7. The portable electronic device of claim 1 wherein the aperiodic vent comprises a flow resistive mesh that allows a fluid to leak between the back volume chamber and the interior chamber when the aperiodic vent is open.
8. The portable electronic device of claim 1 wherein the valve comprises a compliant membrane between the back volume chamber and the interior chamber and the aperiodic vent is formed in the compliant membrane.
9. The portable electronic device of claim 8 wherein in the closed position, the compliant membrane seals to a first sealing surface between the compliant membrane and the back volume chamber or a second sealing surface between the compliant membrane and the interior chamber to close the aperiodic vent.
10. A portable electronic device comprising:
an enclosure having an enclosure wall that forms an interior chamber;
a driver module positioned within the interior chamber, the driver module having a driver and a module wall forming a back volume chamber of the driver, wherein the back volume chamber comprises an opening in the module wall to the interior chamber; and
an impulse pressure rejecting valve coupled to the opening, the impulse pressure rejecting valve having a flow resistive mesh coupled to a valve diaphragm that transitions to a closed position in response to an impulse pressure and an open position in the absence of the impulse pressure.
11. The portable electronic device of claim 10 wherein the driver is a speaker and the impulse pressure is different than a sound pressure output by the speaker.
12. The portable electronic device of claim 10 wherein the impulse pressure is caused by a user applying a force to, or removing a force from, the enclosure wall.
13. The portable electronic device of claim 10 wherein in the closed position, the valve diaphragm prevents fluid flow between the back volume chamber and the interior chamber through the flow resistive mesh.
14. The portable electronic device of claim 10 wherein in the open position, the valve diaphragm allows fluid flow between the back volume chamber and the interior chamber through the flow resistive mesh.
15. The portable electronic device of claim 10 wherein the flow resistive mesh comprises a resistivity sufficient to allow for pressure equalization of the impulse pressure over time so that the valve diaphragm transitions to the open position.
16. The portable electronic device of claim 10 wherein the flow resistive mesh is part of an aperiodic vent formed through the valve diaphragm.
17. The portable electronic device of claim 10 wherein the valve diaphragm comprises a center portion aligned with the opening in the module wall and a surround portion that couples the center portion to the module wall, and wherein the flow resistive mesh is coupled to the surround portion.
18. The portable electronic device of claim 17 wherein in the closed position, the surround portion seals to a first sealing surface between the valve diaphragm and the back volume chamber or a second sealing surface between the valve diaphragm and the interior chamber.
19. The portable electronic device of claim 18 wherein a positive impulse pressure seals the valve diaphragm to the first sealing surface.
20. The portable electronic device of claim 18 wherein a negative impulse pressure seals the valve diaphragm to the second sealing surface.