Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1978-03-07
1979-11-06
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
H01L 4110
Patent
active
041737253
ABSTRACT:
An ultrasonic transducer comprising a first cylindrical member which includes a mechanical vibration amplifying part formed in symmetry around the axis thereof and having a gradually increased cross-sectional area toward a base portion thereof, the base portion having a flat surface perpendicular to the axis thereof, and an annular rigid part formed with the mechanical vibration amplifying part coaxially therewith, the annular rigid part being extended from the outer wall of the base portion axially and radially outwardly to have sufficient rigidity and weight, and the annular rigid part being provided, in the proximity of the outer wall of the base portion, with an annular groove or gap having a predetermined axial depth in order to reduce the diameter of the flat surface. The transducer further comprises a second cylindrical member which includes a backing block of a cylindrical body, a base portion of which is formed with a flange and a flat surface perpendicular to the axis thereof having the larger diameter than that of the flat surface of the first cylindrical member. An ultrasonic transducer portion is interposed between the flat surfaces of the first and second cylindrical members and comprises a pair of piezoelectric elements having flat surfaces perpendicular to the axis of the first and second surfaces, and an electrode plate interposed between the pair of piezoelectric elements. A fastening device pressingly abuts the flat surfaces of the piezoelectric elements against the flat surfaces of first and second cylindrical members and integrally clamps the annular rigid part and the flange of the second cylindrical member to each other in a manner to circumvent said annular groove or gap. The ultrasonic transducer prevents the flexural vibration of the flat surface of the first cylindrical member and prevents cracking of piezoelectric elements to ensure stabilized operations without transitional variations in electric impedance and resonance frequency and to allow continuous vibrating operations in large amplitude over a long period of time.
REFERENCES:
patent: 2512743 (1950-06-01), Hansell
patent: 3328610 (1967-06-01), Jacke et al.
patent: 3578996 (1971-05-01), Balamuth
patent: 3772538 (1973-11-01), Supitilov
patent: 3845332 (1974-10-01), Last
Asai Kiyokazu
Takeuchi Akihiro
Budd Mark O.
Kabushiki Kaisha Toyota Chuo Kenkyusho
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