Directional microphone
A directional microphone is provided which includes a substrate having a cavity that penetrates therethrough, a resonator array of at least one resonator, and a cover member. Each of the resonator array and the cover member covers covering at least a part of the cavity.
1. A directional microphone comprising:
a substrate comprising a cavity that penetrates therethrough, the cavity comprising a first portion and a second portion, wherein the first portion and the second portion, together, comprise an entirety of the cavity;
a resonator array comprising a plurality of resonators, wherein the resonator array covers the first portion of the cavity; and
a cover member covering at least a part of the second portion of the cavity,
wherein the plurality of resonators have different center frequencies, and
wherein the cover member is disposed on the same plane as the plurality of resonators and comprises a thin film.
2. The directional microphone of claim 1 , wherein one end portion of each of the plurality of resonators is a fixed portion fixed to the substrate.
3. The directional microphone of claim 2 , wherein each of the plurality of resonators comprises:
the fixed portion fixed to the substrate;
a movable portion extending from the fixed portion and moveable in response to an acoustic signal; and
a sensing portion configured to sense a movement of the movable portion.
4. The directional microphone of claim 2 , wherein the cover member covers an entirety of the second portion of the cavity.
5. The directional microphone of claim 1 , further comprising:
a fixing member covering at least a part of the second portion in the cavity;
wherein one end portion of each of the plurality of resonators is fixed to the fixing member.
6. The directional microphone of claim 5 , wherein the fixing member comprises a thin film and moves in association with the plurality of resonators.
7. The directional microphone of claim 6 , wherein the fixing member and the plurality of resonators comprise a same material.
8. The directional microphone of claim 5 , wherein the fixing member and the cover member, together, cover an entirety of the second portion of the cavity.
9. A directional microphone comprising:
a substrate comprising a cavity that penetrates therethrough, the cavity comprising a first portion and a second portion, wherein the first portion and the second portion, together, comprise an entirety of the cavity;
a resonator array comprising a plurality of resonators, wherein the resonator array covers the first portion of the cavity; and
a fixing member covering at least a part of the second portion of the cavity,
wherein the plurality of resonators have different center frequencies,
wherein one end portion of each of the plurality of resonators is fixed to the fixing member, and
wherein the fixing member comprises a thin film and moves in association with the plurality of resonators.
10. The directional microphone of claim 9 , wherein the fixing member covers an entirety of the second portion of the cavity.
11. The directional microphone of claim 9 , further comprising a cover member covering at least a part of the second portion of the cavity.
12. The directional microphone of claim 11 , wherein the cover member comprises a thin film.
13. The directional microphone of claim 11 , wherein the cover member and the fixing member, together, cover an entirety of the second portion of the cavity.
14. A directional microphone comprising:
a substrate;
a resonator array comprising a plurality of resonators, each of the plurality of resonators comprising a fixed portion, a moveable portion moveable in response to an acoustic signal, and a sensing portion configured to sense a movement of the moveable portion;
a cavity penetrating entirely through the substrate and comprising a first portion covered by the resonator array and a second portion not covered by the resonator array, wherein the first portion and the second portion, together, comprise an entirety of the cavity; and
a cover which covers at least a part of the second portion of the cavity,
wherein the plurality of resonators have different center frequencies,
wherein the cover comprises a fixing member,
wherein one end portion of each of the plurality of resonators is fixed to the fixing member, and
wherein the fixing member comprises a thin film and moves in association with the plurality of resonators.
15. The directional microphone of claim 14 , wherein the cover further comprises a cover member, and the cover member and the fixing member, together, cover an entirety of the second portion of the cavity.