Hearing assistance device with improved microphone protection
Disclosed herein, among other things, are methods and apparatus for improved microphone protection for hearing assistance devices. One aspect of the present subject matter includes a hearing assistance device, such as a completely-in-the-canal (CIC) type hearing aid, that includes a battery door with a microphone slit and a battery contact including a microphone port. In various embodiments, the microphone slit and the microphone port are configured to create a nonlinear acoustic path to a microphone of the hearing assistance device. In various embodiments, the acoustic path is configured to prevent earwax from blocking and/or damaging the microphone, such as during insertion, removal or cleaning of the hearing assistance device.
1. A hearing assistance device configured to be powered by a battery and to be worn by a wearer having an ear canal, comprising:
a microphone;
a battery contact configured to electrically connect to the battery, the battery contact including a microphone port;
a battery door including a microphone opening and an acoustic recess, the acoustic recess configured to be positioned over the microphone port by closing the battery door to collect wax when the hearing assistance device is being worn and to be positioned to allow the wax to be cleaned from the acoustic recess by opening the battery door; and
a nonlinear acoustic path formed by closing the battery door, the acoustic path including the microphone opening, the acoustic recess, and the microphone port and allowing a sound to enter the acoustic recess through the microphone opening and reaches the microphone from the acoustic access through the microphone port.
2. The hearing assistance device of claim 1 , comprising:
a shell housing the microphone; and
a faceplate attached to the shell, the faceplate including the battery door and the battery contact.
3. The hearing assistance device of claim 2 , wherein the faceplate comprises a door axis around which the battery door rotates to open and close.
4. The hearing assistance device of claim 3 , wherein the microphone opening comprises a microphone slit formed on a side of the battery door and approximately perpendicular to the door axis.
5. The hearing assistance device of claim 4 , wherein the nonlinear acoustic path comprises at least one approximately 90 degree turn.
6. The hearing assistance device of claim 5 , wherein the nonlinear acoustic path comprises two approximately 90 degree turns.
7. The hearing assistance device of claim 2 , comprising a hearing aid including the microphone, the shell, and the faceplate.
8. The hearing assistance device of claim 7 , wherein the shell is customized to mate with the ear canal of the wearer.
9. The hearing assistance device of claim 8 , wherein the hearing aid comprises a completely-in-the-canal (CIC) hearing aid.
10. The hearing assistance device of claim 8 , wherein the hearing aid comprises invisible-in-the-canal (IIC) hearing aid.
11. A hearing assistance device configured to be worn by a wearer having an ear canal, comprising:
a microphone;
a battery door configured to open and close by rotating around an axis of rotation, the battery door including a microphone slit and an acoustic recess, the microphone slit approximately perpendicular to the axis of rotation;
a battery affixed to the battery door;
a battery contact electrically connected to the battery, the battery contact configured to be an acoustic barrier and including a microphone port; and
a nonlinear acoustic path between the microphone slit and the microphone, the acoustic path formed with the battery door and the battery contact by closing the battery door and including the microphone slit, the acoustic recess, and the microphone port,
wherein the acoustic recess is configured to be positioned over the microphone port by closing the battery door.
12. The hearing assistance device of claim 11 , comprising:
a shell housing the microphone; and
a faceplate attached to the shell, the faceplate including the battery door and the battery contact.
13. The hearing assistance device of claim 12 , wherein the shell is customized to mate the ear canal of the wearer.
14. The hearing assistance device of claim 13 , wherein the hearing assistance device is a hearing aid.
15. The hearing assistance device of claim 12 , wherein the faceplate further comprises:
a door axis around which to battery door rotates to open and close;
a hinge pin along the door axis and coupled to the battery door; and
centering bosses around the hinge pin to reduce drag during opening and closing of the battery door.
16. The hearing assistance device of claim 15 , comprising split draft sidewalls on the battery door to facilitate swing of the battery door during opening and closing of the battery door.
17. The hearing assistance device of claim 12 , wherein the microphone slit is formed on a side of the battery door.
18. The hearing assistance device of claim 17 , wherein the acoustic recess is positioned to collect wax when the hearing assistance device is being worn and allow the wax to be cleaned from the acoustic recess when the battery door is open.
19. The hearing assistance device of claim 11 , wherein the nonlinear acoustic path comprises at least one approximately 90 degree turn.
20. The hearing assistance device of claim 19 , wherein the nonlinear acoustic path comprises two approximately 90 degree turns.