Oct. 29,1946; E-IE- TURNER, JR - 2,410,113 OSCILLATOR Original Filed March 23, 1936‘ v Fla). // k' INVENm , r (40'. BYE-4W1}; nrner J)‘, W. A?i?. Patented Oct. 29, 1946 2,410,113 UNITED STATES PTNT FFICE 2,410,113 OSCILLATOR 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. 1 (Cl. 177—386) 2 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 art, 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 plate. 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 and 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. 2,410,113 3 4 The insulating element may also be supported by the casing through the upper supporting plate inducing high frequency alternating current flux 49. 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 end. 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 same. EDWIN E. TURNER, JR.