US2328496A - Magnetostrictive microphone - Google Patents

Magnetostrictive microphone Download PDF

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Publication number
US2328496A
US2328496A US320608A US32060840A US2328496A US 2328496 A US2328496 A US 2328496A US 320608 A US320608 A US 320608A US 32060840 A US32060840 A US 32060840A US 2328496 A US2328496 A US 2328496A
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United States
Prior art keywords
microphone
bar
magneto
diaphragm
magnetostrictive
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Expired - Lifetime
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US320608A
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Rocard Yves
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Rocard Yves
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Priority to FR857272T priority Critical
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R15/00Magnetostrictive transducers

Description

1943- Y. ROCARD I ,4
'MAGNETOSTRICTIVE MICROPHONE Filed Feb. 24, 1940 May 1 e fos fr/cf) i'c 4 INVENTOR YVELS -ROCARD- ATTORNEYS Patented Aug. 31, 1943 MAGNETOSTRICTIVE MICROPHONE Yves Rocard, Paris, France; vested in the Alien Property Custodian Application February 24, 1940, Serial No. 320,608 In France March 22, 1939 4 Claims. (Cl. 177-386) The present invention is for improvements in or relating to magnetic apparatus and particularly to magneto-striction microphones and has for its object the provision of means for attenuating the mechanical resonance in apparatus such as magneto-striction microphones. In apparatus in which the sonorous pressures .are transformed into variations of magnetic phase'in a coil, a mechanical resonance is desired in order to increase the sensitivity. It will be understood, for example, that if a microphone is designed to receive frequencies in the vicinity of 15,000 per second, if it be estimated that the head-phones and the ear only require after heterodyning, a passing band of 1500 cycles per second, a mechanical resonance on 15,000 with a band width of 1500, constitutes the ideal solution. Unfortunately experience indicates that with known systems the mechanical resonance, even dampened by radiation in water, is always too acute and the width of band of uniform response desired is not attained. By voluntarily creating a supplementary mechanical damping, this eifect can be attained but it is detrimental to the sensitivity.
This invention presents a novel means by which the passing band is increased without losses due to a supplementary damping. It is applicable in particular to apparatus in which a bar or a tube of magneto-strictive metal enters into longitudinal vibrations in the normal working of the apparatus and it consists of a terminal section of the bar or tube being cut at right angles in order to fix it on to a piston or a diaphragm, and of cutting obliquely the other section. so that the bar operates as a plurality of narrow bars placed side by side but of unequal length. A particularly efficient construction is obtained with a laminated bar, the plates of which are of unequal length. The extremity of the sheets regularly distributed in order to produce the oblique design may remain free or may be soldered to a mass placed obliquely or in a straight manner on the .bar. It is not necessary for the section to be fiat and any profile whatever can be given to it. Experience shows that, under these conditions, the microphone using the resonance of such a bar retains its entire sensitivity with a width of passing band increased by 50% to 100% according to circumstances, which effect is desired for listening to submarine noises. In test arrangements an inclination of 45 to 60 of the terminal section has 'given good results.
The invention will be more particularly de scribed with reference to the accompanying drawing in which:
Figures 1 and 2 illustrate two methods of carrying the invention into effect.
Referring to Figure 1 which illustrates in perspective the mounting of a laminated magnetostrictive bar I, all the magnetic circuits and accessories being removed. The bar I, cut obliquely according to the invention, is surmounted by the mass 2 represented as having the same height above each bar, which is in no way necessary. The bar I is soldered, on to the piston 3 of the diaphragm, the edge 4 of which is utilized in the fixture, while a coil 5 connected to a proper source of current surrounds the bar.
Figure 2 illustrates in perspective, a thin cylinder of magneto-strictive metal with its upper extremity cut obliquely and having the lower extremity thereof soldered to the piston 3, also having a coil 5 surrounding the same and having a diiierent form of diaphragm which'is intended for example to be held in a rubber mounting.
What- I claim as my invention and desire to secure by Letters Patent of the United States is:
1. In a magneto-striction apparatus such as a magneto-striction microphone having a diaphragm, the combination of a straight vibrating bar fixed to the said diaphragm at one of the extremities thereof so as to project longitudinally from the same along the axis thereof, the other extremity terminating in an oblique section.
2. In a, magneto-striction apparatus such as a magneto-striction microphone having a diaphragm, the combination of a vibrating bar in the form of a straight elongated member having inner and outer sides fixed to the said diaphragm at one of the extremities thereof so as to project longitudinally from the same along the axis thereof, the other extremity terminating in an oblique section so as to present an end portion out of parallel with respect to said diaphragm.
3. In a magneto-striction apparatus such as a magneto-striction microphone having 3. diaphragm, the combination of a vibrating bar subdivided into flat straight strips of progressively increased length in the direction of the length thereof and fixed to the said diaphragm at one of the extremities thereof so as to project longitudinally from the same along the axis thereof,
the other extremity terminating in an oblique YVES ROCARD.
US320608A 1939-03-22 1940-02-24 Magnetostrictive microphone Expired - Lifetime US2328496A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR857272T 1939-03-22

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US2328496A true US2328496A (en) 1943-08-31

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FR (1) FR857272A (en)
GB (1) GB534599A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468270A (en) * 1944-12-30 1949-04-26 Rca Corp Magnetostrictive transducer
US2526229A (en) * 1947-11-12 1950-10-17 Hazeltine Research Inc Magnetostrictive signal-translating arrangement
US2549578A (en) * 1947-12-30 1951-04-17 Hazeltine Research Inc Magnetostrictive converter time delay device
US2638567A (en) * 1950-05-05 1953-05-12 Eugene J Cronin Magnetostriction apparatus
US2705460A (en) * 1951-01-26 1955-04-05 Harl C Burdick Ultrasonic attachment for oil pumps
US2846654A (en) * 1952-06-25 1958-08-05 Burroughs Corp Magnetostrictive delay line
US2858108A (en) * 1953-04-22 1958-10-28 Drilling Res Inc Well drilling system
US2879496A (en) * 1948-09-30 1959-03-24 Research Corp Plastic cast ring stack transducer
US2922999A (en) * 1956-04-17 1960-01-26 Alcar Instr Inc Nuisance control technique and apparatus therefor
US2984819A (en) * 1944-07-14 1961-05-16 Laymon N Miller Magnetostrictive transducer
US3019660A (en) * 1956-04-26 1962-02-06 Gulton Ind Inc Ultrasonic transducer
US3070790A (en) * 1959-12-30 1962-12-25 Wilfred Roth Acoustic transducers
US3235836A (en) * 1958-06-23 1966-02-15 Motorola Inc Sonic transmitter
US3238476A (en) * 1960-05-14 1966-03-01 Telefunken Patent Electrostrictive torsional vibrator
US3274540A (en) * 1964-12-30 1966-09-20 Leonard J Melhart High energy sonic and ultra-sonic magnetostriction transducer
US3315663A (en) * 1964-04-02 1967-04-25 Goldfarb Herman Bronchoscope having means for producing mechanical vibrations in the bronchial tract
US20120228877A1 (en) * 2011-03-10 2012-09-13 Robello Samuel Systems and methods of energy harvesting with positive displacement motor

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2984819A (en) * 1944-07-14 1961-05-16 Laymon N Miller Magnetostrictive transducer
US2468270A (en) * 1944-12-30 1949-04-26 Rca Corp Magnetostrictive transducer
US2526229A (en) * 1947-11-12 1950-10-17 Hazeltine Research Inc Magnetostrictive signal-translating arrangement
US2549578A (en) * 1947-12-30 1951-04-17 Hazeltine Research Inc Magnetostrictive converter time delay device
US2879496A (en) * 1948-09-30 1959-03-24 Research Corp Plastic cast ring stack transducer
US2638567A (en) * 1950-05-05 1953-05-12 Eugene J Cronin Magnetostriction apparatus
US2705460A (en) * 1951-01-26 1955-04-05 Harl C Burdick Ultrasonic attachment for oil pumps
US2846654A (en) * 1952-06-25 1958-08-05 Burroughs Corp Magnetostrictive delay line
US2858108A (en) * 1953-04-22 1958-10-28 Drilling Res Inc Well drilling system
US2922999A (en) * 1956-04-17 1960-01-26 Alcar Instr Inc Nuisance control technique and apparatus therefor
US3019660A (en) * 1956-04-26 1962-02-06 Gulton Ind Inc Ultrasonic transducer
US3235836A (en) * 1958-06-23 1966-02-15 Motorola Inc Sonic transmitter
US3070790A (en) * 1959-12-30 1962-12-25 Wilfred Roth Acoustic transducers
US3238476A (en) * 1960-05-14 1966-03-01 Telefunken Patent Electrostrictive torsional vibrator
US3315663A (en) * 1964-04-02 1967-04-25 Goldfarb Herman Bronchoscope having means for producing mechanical vibrations in the bronchial tract
US3274540A (en) * 1964-12-30 1966-09-20 Leonard J Melhart High energy sonic and ultra-sonic magnetostriction transducer
US20120228877A1 (en) * 2011-03-10 2012-09-13 Robello Samuel Systems and methods of energy harvesting with positive displacement motor
US8836179B2 (en) * 2011-03-10 2014-09-16 Halliburton Energy Services, Inc. Systems and methods of energy harvesting with positive displacement motor

Also Published As

Publication number Publication date
GB534599A (en) 1941-03-11
FR857272A (en) 1940-09-03

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