Sound producing apparatus and wearable sound device
A sound producing apparatus includes an airflow generator configured to generate an airflow, a first resonance chamber and a second resonance chamber. The second resonance chamber is stacked on the first resonance chamber. A sound is produced via the airflow generated by the airflow generator passing through the first resonance chamber and the second resonance chamber.
1 . A sound producing apparatus, comprising:
an air-pulse generating package, comprising an airflow generator configured to generate an airflow and a first covering structure;
a first resonance chamber and a second resonance chamber; and
a second covering structure, disposed on the air-pulse generating package;
wherein the second covering structure comprises a sealing structure and a covering layer;
wherein the second resonance chamber is stacked on the first resonance chamber;
wherein a sound is produced via the airflow generated by the airflow generator passing through the first resonance chamber and the second resonance chamber.
2 . The sound producing apparatus of claim 1 ,
wherein the airflow generator comprises an air-pulse generating device, configured to produce a plurality of airflow pulses at an ultrasonic frequency;
wherein the airflow comprises the plurality of airflow pulses.
3 . The sound producing apparatus of claim 2 ,
wherein the air-pulse generating device comprises a flap pair, the flap pair comprises a first flap and a second flap opposite to each other.
4 . The sound producing apparatus of claim 3 ,
wherein the flap pair performs a differential movement to form an opening at the ultrasonic frequency.
5 . The sound producing apparatus of claim 3 ,
wherein the flap pair performs a common mode movement and a differential movement;
wherein the air-pulse generating device produces the plurality of airflow pulses via the flap pair performing the common mode movement and the differential movement.
6 . The sound producing apparatus of claim 1 , comprising:
wherein the first resonance chamber is formed between the airflow generator and the first covering structure.
7 . The sound producing apparatus of claim 1 ,
wherein the first covering structure comprises a plurality of first outlets formed on a top side of the first covering structure.
8 . The sound producing apparatus of claim 1 , comprising:
wherein the second resonance chamber is formed within the second covering structure.
9 . The sound producing apparatus of claim 1 ,
wherein a hollow cavity is formed within the sealing structure.
10 . The sound producing apparatus of claim 9 ,
wherein the covering layer covers the sealing structure;
wherein the second resonance chamber is formed between the covering layer, the sealing structure and the first covering structure because of the hollow cavity.
11 . The sound producing apparatus of claim 9 ,
wherein a diameter of the hollow cavity within the sealing structure is gradually narrow from the first covering structure to the covering layer.
12 . The sound producing apparatus of claim 1 , wherein
the sealing structure is a gasket.
13 . The sound producing apparatus of claim 1 ,
wherein the covering layer comprises a plastic layer, a polymer layer or a polyester layer.
14 . The sound producing apparatus of claim 1 ,
wherein the second covering structure comprises at least a second outlet formed on a top side of the second covering structure.
15 . The sound producing apparatus of claim 1 ,
wherein the second resonance chamber is configured to enhance an acoustic impedance of the sound producing apparatus at the ultrasonic frequency.
16 . A wearable sound device, comprising:
a housing; and
a sound producing apparatus, comprising:
an air-pulse generating package, comprising an airflow generator configured to generate an airflow and a first covering structure;
a first resonance chamber and a second resonance chamber; and
a second covering structure, disposed on the air-pulse generating package;
wherein the second covering structure comprises a sealing structure and a covering layer;
wherein the second resonance chamber is stacked on the first resonance chamber;
wherein a sound is produced via the airflow generated by the airflow generator passing through the first resonance chamber and the second resonance chamber.
17 . The wearable sound device of claim 16 ,
wherein the airflow generator comprises an air-pulse generating device, configured to produce a plurality of airflow pulses at an ultrasonic frequency;
wherein the airflow comprises the plurality of airflow pulses.
18 . The wearable sound device of claim 17 ,
wherein the air-pulse generating device comprises a flap pair, the flap pair comprises a first flap and a second flap opposite to each other.
19 . The wearable sound device of claim 18 ,
wherein the flap pair performs a common mode movement and a differential movement;
wherein the air-pulse generating device produces the plurality of airflow pulses via the flap pair performing the common mode movement and the differential movement.
20 . The wearable sound device of claim 16 , comprising:
wherein the first resonance chamber is formed between the airflow generator and the first covering structure.
21 . The wearable sound device of claim 16 , comprising:
wherein the second resonance chamber is formed within the second covering structure.
22 . The wearable sound device of claim 16 , comprising:
an ear tip;
wherein the wearable sound device is an in-ear wearable sound device.