Acoustic transducer, wearable sound device and manufacturing method of acoustic transducer
An acoustic transducer is configured to perform an acoustic transformation. The acoustic transducer is disposed within a wearable sound device or to be disposed within the wearable sound device. The acoustic transducer includes at least one anchor structure, a film structure and an actuator. The film structure is disposed within a first layer and anchored by the anchor structure disposed within a second layer. The actuator is disposed on the film structure, and the actuator is configured to actuate the film structure to form a vent temporarily. The film structure partitions a space into a first volume to be connected to an ear canal of a wearable sound device user and a second volume to be connected to an ambient of the wearable sound device. The ear canal and the ambient are to be connected via the vent temporarily opened when the film structure is actuated.
1. An acoustic transducer, disposed within a wearable sound device or to be disposed within the wearable sound device, configured to perform an acoustic transformation, the acoustic transducer comprising:
at least one anchor structure;
a film structure disposed within a first layer and anchored by the at least one anchor structure disposed within a second layer, wherein the film structure comprises a membrane, and a slit is formed within the membrane; and
an actuator disposed on the film structure, the actuator configured to actuate the film structure to form a vent temporarily;
wherein the film structure partitions a space into a first volume to be connected to an ear canal of a wearable sound device user and a second volume to be connected to an ambient of the wearable sound device;
wherein the ear canal and the ambient are to be connected via the vent temporarily opened when the film structure is actuated;
wherein the slit divides the membrane into a first membrane portion and a second membrane portion, the first membrane portion is actuated to have a first displacement, and the second membrane portion is actuated to have a second displacement;
wherein over a segment of the slit, a difference between the first displacement of the first membrane portion and the second displacement of the second membrane portion is larger than a thickness of the membrane, and the vent is formed over the segment of the slit.
2. The acoustic transducer of claim 1 , wherein the membrane is configured to perform the acoustic transformation.
3. The acoustic transducer of claim 1 , wherein the membrane is configured to be actuated to form the vent, and the vent is formed because of the slit.
4. The acoustic transducer of claim 1 , wherein a portion of the film structure by the slit makes no physical contact with any other component within the acoustic transducer.
5. The acoustic transducer of claim 1 , wherein the film structure comprises:
a first flap disposed within the first layer, the first flap comprising:
a first end anchored by a first anchor structure of the at least one anchor structure; and
a second end configured to perform a first up-and-down movement to form the vent.
6. The acoustic transducer of claim 5 , wherein the film structure comprises:
a second flap disposed within the first layer, the second flap comprising:
a first end anchored by a second anchor structure of the at least one anchor structure; and
a second end opposite to the second end of the first flap and configured to perform a second up-and-down movement to form the vent.
7. The acoustic transducer of claim 6 , wherein the membrane configured to perform the acoustic transformation comprises the first flap and the second flap.
8. The acoustic transducer of claim 1 , wherein the wearable sound device further comprises a housing structure, and the space divided into the first volume and the second volume is formed within the housing structure.
9. The acoustic transducer of claim 1 , wherein the wearable sound device further comprises:
a sensing device configured to generate a sensing result;
wherein whether the vent is formed is determined according to the sensing result.
10. The acoustic transducer of claim 9 , wherein
the vent is to be opened when a sensed quantity indicated by the sensing result crosses a certain threshold with a first polarity;
the vent is to be closed when the sensed quantity crosses the certain threshold with a second polarity opposite to the first polarity.
11. The acoustic transducer of claim 9 , wherein a degree of opening of the vent is to be monotonically related to a sensed quantity indicated by the sensing result.
12. The acoustic transducer of claim 9 , wherein the sensing device comprises a proximity sensor, a sensed quantity indicated by the sensing result represents a distance between an object and the proximity sensor, and a degree of opening of the vent is to be correlated to the distance sensed.
13. The acoustic transducer of claim 9 , wherein the sensing device comprises a motion sensor, a sensed quantity indicated by the sensing result represents a motion of the wearable sound device, and a degree of opening of the vent is to be correlated to the motion sensed.
14. The acoustic transducer of claim 1 , wherein
the wearable sound device comprises a driving circuit configured to generate a driving signal to actuate the membrane configured to perform the acoustic transformation;
the driving circuit comprises a frequency response equalizer;
the frequency response equalizer is enabled when the vent is opened;
the frequency response equalizer is disabled when the vent is closed.
15. The acoustic transducer of claim 1 , comprising a base, wherein a back vent is formed within the base.