Push-pull capacitive micro-machined ultrasound transducer array

Details Push-pull capacitive micro-machined ultrasound transducer array Push-pull capacitive micro-machined ultrasound transducer array

2011-03-08

2011-03-08

Ni, Suhan (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Microphone capsule only

C381S369000

Reexamination Certificate

active

07903830

ABSTRACT:
A push-pull capacitive micromechanical ultrasound transducer (CMUT) is provided for ultrasound imaging or therapy. Gaps and electrodes on both sides of an electrostatic membrane provide push-pull operation. The membrane is oriented to flex in a direction of acoustic propagation. A surface connected to the membrane may better expose the movement to the acoustic medium even in the push-pull arrangement.

REFERENCES:
patent: 2631196 (1953-03-01), Janszen
patent: 4533794 (1985-08-01), Beveridge
patent: 2003/0118203 (2003-06-01), Raicevich
Frederick V. Hunt, Electroacoustics, The Analysis of Transduction, and Its Historical Background, copyright 1954 & 1982, pp. 172-212, American Institute of Physics for the Acoustical Society of America.
J. H. Streng, Charge Movements on the Stretched Membrane in Circular Electrostatic Push-Pull Loudspeaker, J. Audio Eng. Soc., vol. 38, No. 5, 1990 May, pp. 331-338, Philips Research Laboratories, The Netherlands.
Patrick De. Visschere, Accurate Model for the Push-Pull Electrostatic Loudspeaker, J. Audio Eng. Soc., vol. 43, No. 7/8, Jul./Aug. 1995, pp. 563-571, University of Gent, Department of Electronics and Information Systems, Belgium.
U.S. Appl. No. 11/051,349, filed Feb. 4, 2005, Lu et al., Multi-Dimensional Ultrasound Transducer Array.
U.S. Appl. No. 11/236,700, filed Sep. 26, 2005, Oliver et al., 3-1 Mode Capacitive Membrane Ultrasound Transducer.

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