Granted Patent B2

US 12,075,213 · App. 18/321,757 · Granted Aug 27, 2024

Inventors: Jemm Yue Liang (Sunnyvale, CA); Jye Ren (Taipei, TW)

Assignee: xMEMS Labs, Inc.

H04R23/00H04R3/04H04R7/06H04R17/00H04R2217/03

Abstract

Claims (65)

1. An air-pulse generating device, comprising:

a film structure;

a first actuator, disposed on the film structure and configured to actuate the film structure;

wherein the film structure is driven by a modulation-driving signal, so as to form an amplitude-modulated ultrasonic air pressure variation with an ultrasonic carrier frequency;

wherein the film structure is driven by a first demodulation-driving signal and a second demodulation-driving signal, so as to form an opening at a rate synchronous with the ultrasonic carrier frequency;

wherein the air-pulse generating device produces a plurality of air pulses according to the amplitude-modulated ultrasonic air pressure variation;

wherein the first actuator comprises a first electrode and a second electrode;

wherein the first electrode and the second electrode receive the modulation-driving signal and the first demodulation-driving signal.

2. The air-pulse generating device of claim 1 ,

wherein the film structure comprises a flap pair;

wherein the flap pair comprises a first flap and a second flap;

wherein the first flap is driven by the first demodulation-driving signal, and the second flap is driven by the second demodulation-driving signal;

wherein the flap pair forms the opening at the rate synchronous with the ultrasonic carrier frequency.

3. The air-pulse generating device of claim 2 ,

wherein the flap pair is driven by the modulation-driving signal to form the amplitude-modulated ultrasonic air pressure variation with the ultrasonic carrier frequency.

4. The air-pulse generating device of claim 1 ,

wherein the film structure comprises a flap pair;

wherein the flap pair comprises a first flap;

wherein the air-pulse generating device comprises a first actuator disposed on the first flap;

wherein the first actuator comprises a first electrode and a second electrode;

wherein the first electrode receives the modulation-driving signal;

wherein the second electrode receives the first demodulation-driving signal.

5. The air-pulse generating device of claim 1 ,

wherein the film structure comprises a flap pair;

wherein the flap pair comprises a first flap;

wherein the first actuator is disposed on the first flap.

6. The air-pulse generating device of claim 1 ,

wherein the film structure comprises a flap pair;

wherein the flap pair comprises a first flap and a second flap;

wherein the air-pulse generating device comprises a first actuator disposed on the first flap and a second actuator disposed on the second flap;

wherein the first actuator comprises a first electrode and a second electrode, and the second actuator comprises a third electrode and a fourth electrode;

wherein a first applied signal is applied between the first electrode and the second electrode;

wherein a second applied signal is applied between the third electrode and the fourth electrode;

wherein a common-mode signal component between the first applied signal and the second applied signal comprises the modulation-driving signal;

wherein a differential-mode signal component between the first applied signal and the second applied signal comprises the first demodulation-driving signal.

7. The air-pulse generating device of claim 6 ,

wherein the first applied signal comprises the modulation-driving signal and the first demodulation-driving signal;

wherein the second applied signal comprises the modulation-driving signal and the second demodulation-driving signal.

8. The air-pulse generating device of claim 6 ,

wherein the first electrode and the third electrode receive the modulation-driving signal, the second electrode receives the first demodulation-driving signal, and the fourth electrode receives the second demodulation-driving signal.

9. The air-pulse generating device of claim 1 ,

wherein the film structure comprises a flap pair;

wherein the flap pair comprises a first flap and a second flap;

wherein the air-pulse generating device comprises a first actuator disposed on the first flap and a second actuator disposed on the second flap;

wherein the first actuator comprises a first top electrode and a first bottom electrode, and the second actuator comprises a second top electrode and a second bottom electrode;

wherein the first top electrode receives the first demodulation-driving signal, the second top electrode receives the second demodulation-driving signal, and the first and second bottom electrodes receive the modulation-driving signal.

10. The air-pulse generating device of claim 1 ,

wherein a toggling rate of the modulation-driving signal is twice of a toggling rate of the first demodulation-driving signal.

11. The air-pulse generating device of claim 1 ,

wherein the modulation-driving signal comprises a pulse amplitude modulation signal.

12. The air-pulse generating device of claim 1 ,

wherein the modulation-driving signal comprises a plurality of pulses with alternating polarities with respect to a voltage.

13. The air-pulse generating device of claim 1 ,

wherein the modulation-driving signal comprises a plurality of pulses;

wherein a polarity of the plurality of pulses with respect to a voltage alternates twice in an operating cycle;

wherein the operating cycle is a reciprocal of the ultrasonic carrier frequency.

14. The air-pulse generating device of claim 1 ,

wherein a first polarity of the first demodulation-driving signal with respect to a voltage within a time period is opposite to a second polarity of the second demodulation-driving signal with respect to the voltage within the time period.

15. The air-pulse generating device of claim 1 ,

wherein a sum of the first demodulation-driving signal and the second demodulation-driving signal is constant.

16. The air-pulse generating device of claim 1 ,

wherein the film structure comprises a first flap pair and a second flap pair;

wherein the first flap pair comprises a first demodulating flap and a second demodulating flap, the first demodulating flap is driven by the first demodulation-driving signal and the second demodulating flap is driven by the second demodulation-driving signal;

wherein the second flap pair is driven by the modulation-driving signal, so as to form the amplitude-modulated ultrasonic air pressure variation with the ultrasonic carrier frequency;

wherein a first polarity of the first demodulation-driving signal with respect to a voltage within a time period is opposite to a second polarity of the second demodulation-driving signal with respect to the voltage within the time period.

Assignments (1)

Continuity (21)