US2003284A - Acoustic apparatus - Google Patents

Acoustic apparatus Download PDF

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Publication number
US2003284A
US2003284A US320368A US32036828A US2003284A US 2003284 A US2003284 A US 2003284A US 320368 A US320368 A US 320368A US 32036828 A US32036828 A US 32036828A US 2003284 A US2003284 A US 2003284A
Authority
US
United States
Prior art keywords
diaphragm
lever
armature
rod
sound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US320368A
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English (en)
Inventor
Ivan C Clement
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Submarine Signal Co
Original Assignee
Submarine Signal Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Submarine Signal Co filed Critical Submarine Signal Co
Priority to US320368A priority Critical patent/US2003284A/en
Priority to FR682933D priority patent/FR682933A/fr
Application granted granted Critical
Publication of US2003284A publication Critical patent/US2003284A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S1/00—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith
    • G01S1/72—Beacons or beacon systems transmitting signals having a characteristic or characteristics capable of being detected by non-directional receivers and defining directions, positions, or position lines fixed relatively to the beacon transmitters; Receivers co-operating therewith using ultrasonic, sonic or infrasonic waves

Definitions

  • the present invention relates to sound receivreceiving sound in'yvater.
  • Such a receiver is'useful in listening tonoises of a boat in the water where there is no single pitch of the sound but a general mingling of many sounds of different frequencies and char acteristics. It is also useful in the transmission of speech under water-and in the air. It has,
  • Receivers of this character have been built, some of which. have been fairly successful and others of which have failed in operation in many places where it has been attempted to use .them.
  • One type of receiver-which has been used combines the balanced armature drive or detector unit with a soft rubber diaphragm.
  • receivers have been tried, such as combinations of coupled and tuned circuits, some with fair success in operation, but as a rule such receivers require careful workmanship in construction to make two alike. Further, very often changes in material. through use or change -in temperature so change the characteristics of the unit that it no longer performs the function for which it was designed. Again, where tuned circuits are employed there are always resonant points which continue to persist by virtue of the resonant structure. These are, in many cases, partially smoothed out, but it is never possible to iron them out completely.
  • Inmy device I have entirely eliminated all resonance indications in the operating range and further have obtained a remarkably sensitive device. This has been possible, not only because of the material which I have used for a diaphragm, but also because of the combinationoi diaphragm and structure, as will appear laier.
  • the diaphragm should be a piston type diaphragm in which practically the entire bending is confined to a small annular section of the diaphragm near its periphery and further that the material should be of the nature of so called linen bakelite; that is, linen sheets impregnated with a phenol resinous product and united in a rigid structure.
  • linen bakelite linen sheets impregnated with a phenol resinous product and united in a rigid structure.
  • Such a material presents an extremely rigid element which yields only as a whole and not in spotspas soft rubber might, and further has a high viscous loss which makes the diaphragm practically non-resonant.
  • the 'hydrophone comprises a casing l, which, when used in water, should be watertight and entirely enclosed, a diaphragm 2 and the deand the bolts 6.
  • the diaphragm 2 is composed of so called linen bakelite or the like and is shaped to be thicker at the middle portion than the edges, so 40 that all the bending which takes place is in a small circular strip near the-clamping edge of the diaphragm.
  • a stud I embedded therein and held firmly in place by the nut 8.
  • the stud I has a hole 9 drilled at 5 the top thereof, in which the rod l0 flts.
  • a set screw 1 I threading in the piece 1 is provided so that the rod Ill might be held firmly in place.
  • the rod I0 is soldered or welded to a horizontally mounted cross lever i2 between its pivot and its outer edge. At the outer edge of the lever I! there is a rod 13 whichmay be welded or riveted to the lever I! at its end, as indicated in the drawing, and which extends vertically to the armature ll.
  • the armature l4 and the rod I: may
  • the armature I 4 is of the balanced type, balanced by the center support It operates in the air gap oi'the permanent magnet is between four poles formed by the magnet.
  • the poles l1 and It may be regarded as north and I8 and 20 as south.
  • the sound energy is picked up by the diainches, and further is relatively thick at the middie with a bending area near the clamping rim.
  • the diaphragm is built up of layers of linen impregnated with a phenol resinous condensation product such as bakelite and is, furthermore, very hard and unyielding to local pressure on points on the diaphra but will yield and bend slightly as a whole, the whole yielding and bending taking place at the edge and furnishing, by means oi! the friction between successive layers, very high viscous losses.
  • a phenol resinous condensation product such as bakelite
  • a magnetophone for submarine sound reception comprising a watertight casing, a plate of woven textile fabric impregnated with phenol resinous condensation product covering the end of said casing to v an acoustic piston diaphragm having an annular bending section, a magnetophone unit mounted within said casing lever pivoted at one end, said armature and lever being disposed parallel to said diaphragm and perpendicularly disposed means connecting one end of said lever with said armature and consystem is in the diaphragm. 2.
  • a submarine sound receiving device comprising a watertight casing having a diaphragm at one side thereof, said diaphragm being composed of a plurality of layers of relatively thin woven textile fabric impregnated with a phenol resinous condensation product and having an annular bending section with a thicker stifier central portion,'an electromagnetic pick-up means including a movable current inducing element and means connecting the latter with the center of the diaphragm, substantially all of the restoring force for the device being furnished by said diaphragm.
  • a submarine sound receivng device comprising a watertight casing having a diaphragm at one side thereof, said diaphragm being composed of a plurality of layers of relatively thin woven textile fabric impregnated with a. phenol resinous condensation product and having an annular bending section with a thicker stiffer central portion, an electromagnetic pick-up means including a magnet, a pivoted armature associated therewith and means connecting the latter to the center of said diaphragm, substantially .all of] the restoringforce for the device being furnished by said diaphr I r IVAN c.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US320368A 1928-11-19 1928-11-19 Acoustic apparatus Expired - Lifetime US2003284A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US320368A US2003284A (en) 1928-11-19 1928-11-19 Acoustic apparatus
FR682933D FR682933A (fr) 1928-11-19 1929-10-08 Magnétophone ou récepteur de son

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US320368A US2003284A (en) 1928-11-19 1928-11-19 Acoustic apparatus

Publications (1)

Publication Number Publication Date
US2003284A true US2003284A (en) 1935-06-04

Family

ID=23246102

Family Applications (1)

Application Number Title Priority Date Filing Date
US320368A Expired - Lifetime US2003284A (en) 1928-11-19 1928-11-19 Acoustic apparatus

Country Status (2)

Country Link
US (1) US2003284A (fr)
FR (1) FR682933A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2838127A (en) * 1953-11-04 1958-06-10 Philips Corp Device for the transmission of sound from rooms having a high noise level

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2838127A (en) * 1953-11-04 1958-06-10 Philips Corp Device for the transmission of sound from rooms having a high noise level

Also Published As

Publication number Publication date
FR682933A (fr) 1930-06-04

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