US4353004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for alternate transmission and reception with only one sound source transducer
Assignee: Siemens AG
•
Filing: 1981-01-14
•
Granted: 1982-10-05
•
Expires: 2001-01-14
Abstract
Abstract A circuit is provided for supplying a transmission oscillator voltage suitable for a piezoelectric sound source transducer in which the transducer also serves as a receiving transducer. The circuit contains an electrical series resonant circuit having a capacitor C and an inductor L with L·C=(1/2 π f.sub.0).sup.2, wherein the electrical series resonant circuit is matched to the series resonant frequency f 0 of the transducer and is connected parallel to the transducer. The circuit further contains a pair of diodes, connected anti-parallel to one another, and connected in parallel to either the inductor L or to the capacitor C, with the output of the receiver being connected to the capacitor C or to the inductor L.
Inventors
- 👤 Peter Kleinschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:57
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/52; G01S7/523; G01S7/524; Y; Y10; Y10S; Y10S367/00; Y10S367/903
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
140 words
A circuit arrangement for supplying transmission oscillator voltage to a piezoelectric sound source transducer and further permitting the transducer to operate as a receiving transducer, comprising: an oscillator for providing an excitation voltage: a transducer responsive to an excitation voltage to emit waves and responsive to received waves to produce a reception voltage signal; switching means connected between said oscillator and said transducer and operable to couple and decouple the same; a series resonant circuit connected in parallel with said transducer and including an inductor and a capacitor and having a resonant frequency f O defined by L·C=(1/2πf.sub.O).sup.2 where L and C are the inductance and capacitance values, respectively; a pair of diodes poled opposite to one another and connected in parallel to one of said elements of said resonant circuit; and a receiver output connected to said resonant circuit.
Claim 2
Dependent Claim
140 words
A circuit arrangement for supplying transmission oscillator voltage to a piezoelectric sound source transducer and further permitting the transducer to operate as a receiving transducer, comprising: an oscillator for providing an excitation voltage: a transducer responsive to an excitation voltage to emit waves and responsive to received waves to produce a reception voltage signal; switching means connected between said oscillator and said transducer and operable to couple and decouple the same; a series resonant circuit connected in parallel with said transducer and including an inductor and a capacitor and having a resonant frequency f O defined by L·C=(1/2πf.sub.O).sup.2 where L and C are the inductance and capacitance values, respectively; a pair of diodes poled opposite to one another and connected in parallel to one of said elements of said resonant circuit; and a receiver output connected to said resonant circuit.
Claim 3
Dependent Claim
28 words
The circuit arrangement of claim 1, wherein: said inductor comprises a transformer including a primary winding connected to said capacitor and a secondary winding serving as said output.
Claim 4
Dependent Claim
27 words
The circuit arrangement of claim 1, wherein: said capacitor has a capacitance value C which is smaller than the parallel capacitance value C o of said transducer.
Claim 5
Dependent Claim
31 words
The circuit arrangement of claim 3, wherein: the capacitance value C is approximately equal to the value C·k 2 , where k 2 is the electro-mechanical coupling factor of said transducer.
Claim 6
Dependent Claim
50 words
The circuit arrangement of claim 3, wherein: the ratio α=C.sub.o /C is selected such that given a predetermined value Q el of the resonant circuit and a predetermined value Q m and a predetermined value of the coupling value k 2 of the transducer C.sub.o /C=Q.sub.el /k.sup.2 ·O.sub.m approximately occurs.
Claim 7
Dependent Claim
33 words
The circuit arrangement of claim 1, wherein; said switching means comprises a pair of diodes connected in parallel and opposite polarity to one another and in series between said oscillator and said transducer.
Claim 8
Dependent Claim
27 words
The circuit arrangement of claim 1, wherein: said switching means comprises a pair of switching transistors connected as an emitter follower between said oscillator and said transducer.
References Cited (Backward Citations)
US2852676A
Cited
US2963680A
Cited
US2983902A
Cited
US3100886A
Cited
US3989963A
Cited
US4044297A
Cited
US4096756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |