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Oct. 29,1946;
- 2,410,113
Original Filed March 23, 1936‘
v Fla).
, r
nrner J)‘,
W. A?i?.
Patented Oct. 29, 1946
Edwin E. Turner, Jr., West Roxbury, Mass, as
srgnor, by mesne assignments, to Submarine
Signal Company, Boston, Mass., a corporation
of Delaware
Original application March 23, 1936, Serial No.
70,365. Divided and this application October
14, 1937, Serial No. 168,920
7 Claims.
(Cl. 177—386)
The present application is a division of my co
out application this is also accomplished and at
pending application Serial No. 70,365, ?led March
the same time the magnetostrictive elements are
operated more efficiently because of a decrease
in the mechanical and electrical losses as will ap
23, 1936, entitled Oscillators,
The present invention relates to a device for
producing mechanical vibrations and in partic
ular mechanical vibrations having a rapid rate
of oscillations within the range adapted to pro
duce in a proper medium, particularly in Water
as in submarine signaling, compressional waves
above the ordinary range of audibility to the
human ear.
In the present invention the vibrations of the
pear from the description in the speci?cation.
The invention will be more fully understood
from the description of the embodiment given be
low and illustrated in the drawing in which Fig. 1
shows a plan view with a portion of the top case
removed, Fig. 2 shows a section taken on the
line 2-2 of Fig. l and Fig. 3 shows .an enlarged
detail of a portion of Fig.2.
nature described above are produced over a large
Figs. 1, 2 and v3 show a spiral shaped magneto
vibratory surface in such a manner that the
strictive element, In this embodiment as shown
propagation of the waves in the medium is in a 15 in Fig. 2 there is provided a heavy plate All which
beam, although for lower frequencies the beam
has on the inside a recessed portion 41 in which
may be spread to form a radiating cone of_ de
sired angular opening, the factors controlling the
size of the opening depending upon the relation
there is placed a magnetostrictive sheet 42 wound
in a spiral as more clearly indicated in Fig. 1.
of the wave length, the area and form of the vi
brating surface in a manner known in the prior
On the outside of this sheet there is positioned
a conductor 53 which also extends around the
entire spiral to the inside lit making the ele
ments 43 and 441 one piece of material. This may
In the present invention the beam is generated
be readily seen in Fig. l at the center of the spiral
by means of a series of elements operating si
where the element 44 continues around the end
multaneously in a plate or vibratory surface, the
of the magnetostrictive member 42. The mem
relationship of the length of the elements on the
ber 64 does not extend all of the way up on both
plate, their masses and the thickness of the plate,
sides of the magnetostrictive member 42 but is
conforming to the principles laid down in the
concentrated near the lower end adjacent the
companion Edwin
Turner application, Serial
The magnetostrictive elements are
No. 677,179, ?led June 23, 1933. In the present 30 mounted in the plate by means of some metallic
invention the elements impressing the vibratory
material 45 of suitable melting point to hold the
energy on the plate may be either magnetostric
spiral to the plate and yet not change the char
tive in which the mechanical vibrations are de
acteristic of the nickel elements themselves. The
veloped through the magnetostrictive effect of
the flux passing through the elements them
selves, electrodynamic or magnetic. In the pres
ent application the embodiment including the
magnetostrictive system is shown and described.
element surrounding the nickel spiral is supplied
' with current by means of the conductors 46 and
41 which in effect completes one turn of a coil
about the magnetostrictive element 42
therefore when supplied with current induces a
At very high frequencies such as those within
flux therein longitudinally along the axis of the
the range of 20,000 cycles per second and high 40 spiral elements.
er, there is a distinct tendency for electric cur
An enlarged section of a portion of the con
rent to crowd near the surface of the conductor
ductor shown in Fig. 2 is shown in Fig. 3 and in
and as a result in magnetostrictive and nickel
dicates quite clearly the relative sizes and posi
elements, therefore, the ?ux and magnetostric
tions of the magnetostrictive member 42 and the
tive action take place to the greatest degree near
surrounding conductor 44. The surrounding
conductor 4!! is preferably suf?ciently long to in
the external surface. This also may cause a dif-'
ference in vibratory stresses longitudinally in
sure the induction of the magnetostrictive ?ux
Various parts of the nickel and as a result the
in a position close to the ‘node in the spiral.
nickel elements may not operate at the maximum
The conductive elements 43 and 44, as indi
e?iciency. It is highly desirable, however, on 50 cated in Fig. 3, may be supported on an insulated
account of the high frequencies and the short
frame 43 which extends down between the con
wave-lengths that result, to drive the vibratory
volutions of the spiral in proximity to the sides
surfaces at a large number of points and this the
of the magnetostrictive element 42. The conduc
applicant has accomplished in his prior appli
tive elements 43 and 455 may be mounted upon
cation referred to above. However, in the pres 55 this insulating element in any usual manner.
The insulating element may also be supported by
the casing through the upper supporting plate
inducing high frequency alternating current flux
The conducting element 43 may itself have
in said spiral normal to said plate member a d
means adapted to conduct current to said ? st
a coat of insulation on the outside, as, for in
stance, varnish or enamel or any other suitable
named means.
strictive sheet formed in a spiral with one edge
wave length of the wave in the propagating me
3. A device for producing mechanical vibrations
of very high frequency comprising a plate mem
material, but this is not needed where the con
ber, a' sheet of magnetostrictive material formed
ductive element does not come in contact with
the magnetostriction spiral. The plate 40 upon
in a spiral and having one of its edges ?xed to said
plate, said plate and spiral forming together a
which the magnetostrictive spiral is mounted
may be supported in the manner described in the 10 vibrational system of one-half wave length with
original application by means of the ?ange 50
the vibrational node in the spiral adjacent the
plate, means positioned adjacent said spiral
extending over the ?anged rim 5| of the casing
52 to which it is attached by means of the clamp
member at the vibrational node thereof for elec
trodynamically inducing high frequency current
ing ring 53 and the bolts 54, The same general
principle as stated in the original application Se 15 flux in said spiral normal to said plate and means
for conducting current to said means.
rial No. 70,365 between cylindrical elements ap
4. A device for producing mechanical vibra
plies equally here with the distance between
tions of very high frequency comprising a plate
spiral convolutions and the principles also stated
member having a recessed portion at the back
therein are equally well applied to the relations
of the thickness of the plates. The plate or 20 thereof extending substantially over its entire
mass 453 in the present case is so proportioned
surface, a sheet of magnetostrictive material
formed as a spiral and having its edges positioned
that the system including the spiral convolutions
42 is established as a one-half wave length sys
in the recessed portion of said plate member, a
metal of comparatively low melting point ?lling
tem wherein the nodes of the system occur in a
the spaces between the convolutions of the spiral
plane normal to the convolution elements sub
and ?lling the recessed portion of said plate, con
stantially near the plate d0. In accordance with
ductive means enveloping the surface of said
this limitation the plate must have the proper
magnetostrictive sheet but positioned free from
thickness and mass and for the same material
said plate for inducing alternating high frequen
the thickness is preferably one-quarter wave
length or less in the direction normal to the sur 30 cy current flux in said spiral normal to said plate
face of the wave generated and propagated in
and means for conducting current to said con
ductive means.
the material.
5. A device for producing mechanical vibra
In the operation of the system the coil as set
tions of very high frequency comprising a plate
up surrounding both the inside and the outside
of the magnetostrictive member 42 tends to con
member, a sheet of magnetostrictive material
formed in a spiral having equally spaced convo
centrate the flux in the magnetostrictive mate
rial. This concentration of flux is in the part of
lutions, means securing one of the edges of said
spiral in said plate, the space between succes
the spiral, as is pointed out just above, where a
sive convolutions being less than the thickness of
node of motion exists and where, therefore, the
maximum variation of magnetostrictive ?ux is 40 said plate, conductive means enveloping and ad
jacent the surface of said magnetostrictive sheet
obtained. Since the greatest variation of mag
for inducing alternating high frequency current
netic flux occurs around the node, it is only nec
?ux in said spiral normal to said plate and means
essary for the conductive element 43 to extend
upwards for a short distance along the magneto
for conducting current to said conductive means.
6. An acoustical apparatus comprising in com
strictive spiral, and the conductive element 43 is 45
therefore shown as extending only a portion of
bination a plate member, electromechanical en
the distance along the magnetostrictive element.
ergy interchanging means ?xedly mounted on
said plate, said means including a spirally
Having now described my invention, I claim:
1. A device for producing a beam of supersonic
mounted magnetostrictive element in which each
compressional wave energy comprising a plate 50 spiral is spaced from its adjacent spiral, the con
having a large diameter compared with the wave
volutions covering substantially the plate which
length of the wave to be produced, a magneto
has linear dimensions large as compared with the
of the sheet ?xed to said plate, the spiral form
dium within which the apparatus is to operate.
ing with the plate a vibrational system of one 55
7. An acoustical apparatus comprising in com
half wave length with the vibrational node in the
bination a plate member, electromechanical en
spiral adjacent the plate, and a single copper
ergy interchanging means ?xedly mounted on
turn following the spiral on one side from the
said plate, said means including a spirally
outer end of the sheet to the center of the spiral,
mounted element in which each spiral is spaced
passing around the central end of the latter, and 60 from its adjacent spiral, the convolutions cover
following the other side of the spiral to its outer
ing substantially the plate which has linear di
mensions large as compared with the wave
2. A device for producing mechanical vibra
length of the wave in the propagating medium
tions of very high frequency comprising a plate
within which the apparatus is to operate and a
member, a sheet element of magnetostrictive ma (£5 coil surrounding the spiral for energizing the
terial formed as a spiral with one edge thereof
?xed to said plate member, means positioned ad
jacent said spiral sheet for electrodynamically
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