Keypad and microphone arrangement
View Patent ↗Disclosed is a keypad and microphone arrangement for a communication device. The arrangement comprises: a key having a cap portion and a stem portion; a base layer attached to the stem portion; a key circuit to recognize activation of the key; a support member to support the key and base layer; a microphone located beneath the support member; a port in the base layer extending from an upper surface of the base, through an interior of the base layer, to a lower surface of the base layer. The support member has an opening extending from its top surface, through its interior, to its bottom surface. There is also an air channel connecting the microphone to ambient air above the cap portion, the air channel comprising the port and the opening. The stem portion and the cap portion are located about the port such that the cap portion extends fully over the port. The arrangement may be used in any communication device having voice reception capabilities.
1. A keypad and microphone arrangement for a communication device, said arrangement comprising:
a key comprising a cap portion and a stem portion;
a base layer supporting said key, said base layer being attached to a bottom part of said stem portion;
a microphone located below said keypad;
a port connecting said microphone to ambient air above said base layer, said port having a first opening extending from a top side to a bottom side of said base layer;
a key circuit to recognize activation of said key, said key circuit located beneath said base layer and mounted on a first printed circuit board (PCB), said first PCB having a second opening from its to surface through its interior to its bottom surface;
a second PCB for mounting said microphone thereon; and
a support member for said key circuit mounted to said second PCB and located below said key circuit, said support member having a third opening from its top surface, through its interior to its bottom surface,
wherein
said cap portion extends fully over said first opening of said port on said top side; and
an air channel is defined from said microphone to said port on said top side of said base layer, said air channel comprising said first opening, said second opening and said third opening.
2. The keypad and microphone arrangement for a communication device as claimed in claim 1 , wherein said support member is located above said microphone.
3. The keypad and microphone arrangement for a communication device as claimed in claim 2 , wherein said air channel extends vertically from said microphone to said port in a column.
4. The keypad and microphone arrangement for a communication device as claimed in claim 1 , wherein said first opening of said port in said top surface of said base layer is located under a corner of said cap.
5. The keypad and microphone arrangement for a communication device as claimed in claim 1 , wherein said stem has an inward notch in its body adjacent to said corner of said cap.
6. The keypad and microphone arrangement for a communication device as claimed in claim 1 , wherein said microphone is enclosed in a Faraday shield mounted on said first PCB.
7. The keypad and microphone arrangement for a communication device as claimed in claim 1 , wherein:
said base layer is made from a silicon polymer; and
said cap is made from polycarbonate.
8. The keypad and microphone arrangement for a communication device as claimed in claim 1 , further comprising a keypad frame placed on top of said base layer.
9. The keypad and microphone arrangement for a communication device as claimed in claim 1 , further comprising adhesive tape to secure said first PCB to said support member.
10. The keypad and microphone arrangement for a communication device as claimed in claim 1 , further comprising a Faraday shield on said second PCB to enclose said microphone.
11. The keypad and microphone arrangement for a communication device as claimed in claim 10 , further comprising an acoustic gasket located between said Faraday shield and said support member.