Microphone
When external pressure extremely increases, a waterproof vibration membrane tends to be resiliently deformed extremely toward the inside. However, an inward resilient deformation inhibiting member provided on the inner side of the waterproof vibration membrane with a space therebetween inhibits this extreme inward resilient deformation of the waterproof vibration membrane, whereby the waterproof vibration membrane is prevented from being ruptured or plastically deformed. On the other hand, when the internal pressure extremely increases, the waterproof vibration membrane tends to be resiliently deformed extremely toward the outside. However, an outward resilient deformation inhibiting member provided on the outer side of the waterproof vibration membrane with a space therebetween inhibits this extreme outward resilient deformation of the waterproof vibration membrane, whereby the waterproof vibration membrane is prevented from being ruptured or plastically deformed.
1. A microphone comprising:
a waterproof vibration membrane;
a microphone element which receives a vibration as a sound from the waterproof vibration membrane;
an outward resilient deformation inhibiting member which is provided on an outer side of the waterproof vibration membrane with a first space therebetween and inhibits outward resilient deformation of the waterproof vibration membrane; and
a first spacer provided between the outward resilient deformation inhibiting member and the waterproof vibration membrane, the first spacer having an opening in an area thereof.
2. The microphone according to claim 1 , further comprising:
an inward resilient deformation inhibiting member which is provided on an inner side of the waterproof vibration membrane with a second space therebetween and inhibits inward resilient deformation of the waterproof vibration membrane.
3. The microphone according to claim 1 , further comprising:
a housing having an opening;
wherein the outward resilient deformation inhibiting member and the waterproof vibration membrane are provided in a portion of the housing having the opening, with the outward resilient deformation inhibiting member closer to the opening than the waterproof vibration membrane; and
wherein the microphone element is provided more at an interior of the housing with respect to the outward resilient deformation inhibiting member and the waterproof vibration membrane.
4. The microphone according to claim 1 , wherein the outward resilient deformation inhibiting member has an opening portion, and the opening in the first spacer corresponds to the opening portion of the outward resilient deformation inhibiting member, such that the first spacer does not overlap the opening portion.
5. The microphone according to claim 4 , further comprising:
an inward resilient deformation inhibiting member which is provided on an inner side of the waterproof vibration membrane with a space therebetween and inhibits inward resilient deformation of the waterproof vibration membrane,
wherein the inward resilient deformation inhibiting member has an opening portion.
6. The microphone according to claim 5 , further comprising:
a second spacer provided between the inward resilient deformation inhibiting member and the waterproof vibration membrane and having an opening in an area corresponding to the opening portion of the inward resilient deformation inhibiting member, such that the second spacer does not overlap the opening portion of the inward resilient deformation inhibiting member.
7. The microphone according to claim 2 , wherein the outward resilient deformation inhibiting member has a thickness different from a thickness of the inward resilient deformation inhibiting member.
8. The microphone according to claim 2 , wherein the first space between the outward resilient deformation inhibiting member and the waterproof vibration membrane and the second space between the inward resilient deformation inhibiting member and the waterproof vibration membrane are different from each other.
9. The microphone according to claim 5 , wherein the opening portion of the outward resilient deformation inhibiting member has an aperture ratio different from an aperture ratio of the opening portion of the inward resilient deformation inhibiting member.
10. The microphone according to claim 1 , wherein the first spacer has a thickness such that the waterproof vibration membrane touches the outward resilient deformation inhibiting member in response to an increase of internal pressure inside of the microphone.
11. A wearable device comprising the microphone according to claim 1 .
12. The microphone according to claim 4 , wherein the opening portion of the outward resilient deformation inhibiting member comprises an area of the outward resilient deformation inhibiting member in which a plurality of holes are provided.
13. The microphone according to claim 5 , wherein the opening portion of the outward resilient deformation inhibiting member comprises an area of the outward resilient deformation inhibiting member in which a plurality of holes are provided; and
wherein the opening portion of the inward resilient deformation inhibiting member comprises an area of the inward resilient deformation inhibiting member in which a plurality of holes are provided.