Ultrasonic transducer

Details Ultrasonic transducer Ultrasonic transducer

1999-07-08

2001-08-21

Larkin, Daniel S. (Department: 2856)

Measuring and testing

Vibration

By mechanical waves

C073S652000, C310S324000

Reexamination Certificate

active

06276212

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an ultrasonic transducer.
BACKGROUND OF THE INVENTION
Known ultrasonic transducers produce ultrasonic waves in response to the application of an electrical signal to a piezoelectric material. In addition, known ultrasonic transducers produce an electrical signal in response to ultrasonic waves that act on a piezoelectric material.
SUMMARY OF THE INVENTION
In accordance with the present invention, an ultrasonic transducer comprises a housing having an axis and a diaphragm centered on the axis at one end of the housing. A cylindrical vibratable mass is disposed in the housing and centered on the axis. The vibratable mass has a first end secured to and centered relative to an inner surface of the diaphragm. The vibratable mass has a second end opposite the first end. The vibratable mass can be vibrated in a direction along the axis. A second cylindrical mass is disposed in the housing and centered on the axis. The second mass has a third end with a recess centered on the axis and an opposite fourth end. The second end of the vibratable mass extends into the recess and is secured to the second mass. The second mass resists the vibration of the vibratable mass toward the second mass. An electrode is fixed to a fourth end of the second mass opposite the third end.
The ultrasonic transducer produces ultrasonic waves in response to the application of an electrical signal to the vibratable mass and/or produces an electrical signal in response to ultrasonic waves acting upon the vibratable mass.


REFERENCES:
patent: 3233465 (1966-02-01), Tolliver et al.
patent: 3349629 (1967-10-01), Elazar
patent: 3651353 (1972-03-01), Hugli et al.
patent: 3821834 (1974-07-01), McElroy
patent: 4030396 (1977-06-01), Mariner
patent: 5477729 (1995-12-01), Cavalloni
patent: 5748567 (1998-05-01), Mori et al.
patent: 19816456 (1999-06-01), None

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