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US4635484A Expired / Lapsed US ⏱️ 0.0 years remaining

Ultrasonic transducer system

Assignee: Siemens AG
•
Filing: 1985-06-06
•
Granted: 1987-01-13
•
Expires: 2005-06-06
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Abstract

Abstract An ultrasonic transducer system is disclosed consisting of a support body (2), a radiating layer (8,9), a first λ/4 matching layer (10,11) and a second λ/4 matching layer (12,13). According to the invention, at least two ultrasonic transducers (4,6) with different and predetermined mid-frequencies are attached to a common support body (2) and have natural foci which overlap if the ultrasonic transducers (4,6) are mechanically separated. The ultrasonic transducer (4), having the higher mid-frequency, is provided with a larger radiating surface (4). This configuration, through the appropriate selection of the mid-frequencies, allows compensation for the frequency dependent damping of the transmission medium by frequency related weighting during radiation. In this manner, substantial improvements with respect to bandwidth of the total transmission path, from transmitting transducer through transmission media to receiving transducer, and the image quality can be realized.

Inventors

  • 👤 Reinhard Lerch

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 05:21
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/32; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2437; G01N29/245

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 58 words
An ultrasonic transducer system characterized by at least two ultrasonic transducers (4,6) having different predetermined mid-frequencies, attached to a common support body and having overlapping natural foci, the ultrasonic transducers (4,6) being separately, electrically controllable, the ultrasonic transducer (4) having the highest mid-frequency being equipped with the largest radiating surface area for producing the highest acoustic power output.
Claim 2
Dependent Claim 58 words
An ultrasonic transducer system characterized by at least two ultrasonic transducers (4,6) having different predetermined mid-frequencies, attached to a common support body and having overlapping natural foci, the ultrasonic transducers (4,6) being separately, electrically controllable, the ultrasonic transducer (4) having the highest mid-frequency being equipped with the largest radiating surface area for producing the highest acoustic power output.
Claim 3
Dependent Claim 31 words
An ultrasonic transducer system according to claim 1, characterized by one of the, at least, two ultrasonic transducers (4,6) being arranged to form a number of sub-resonators connected in parallel electrically.
Claim 4
Dependent Claim 23 words
An ultrasonic transducer system according to claim 1 characterized by arranging the radiating surfaces (14,16) of the ultrasonic transducers (4,6) in a plane.
Claim 5
Dependent Claim 29 words
An ultrasonic transducer system according to claim 1 characterized by the radiating surfaces (142,144,16) of the, at least, two ultrasonic transducers (42,44 and/or 6) being inclined toward one another.
Claim 6
Dependent Claim 89 words
An ultrasonic transducer system according to claim 1 characterized by the ultrasonic transducers (4,6) being provided with a radiating surface (8 and/or 9) of a material having a relatively high dielectric constant and a high acoustic impedance, the surface being coupled on its side facing a load to a first λ/4 matching layer (10 and/or 11), the first λ/4 matching layer attached respectively to a second λ/4 matching layer (12 and/or 13), the second layer being located beween the first λ/4 matching layer (10 and/or 11) and the load.
Claim 7
Dependent Claim 39 words
An ultrasonic transducer system according to claim 5 characterized by at least one of the second λ/4 matching layers (12 and/or 13) of the ultrasonic transducer (4 and/or 60) being employed as a receiving layer and comprising piezo-electrical plastic.

References Cited (Backward Citations)

US3457543A Cited
US4011750A Cited
US3924454A Cited
GB1505411A Cited
DE3014878A1 Cited
US4366406A Cited
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US4398421A Cited
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US4537074A Cited
US4569231A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1990-01-12 1990-07-14 1991-01-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1994-01-12 1994-07-14 1995-01-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1998-01-12 1998-07-14 1999-01-13 $7700.00 Window Closed / Lapsed

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