US1663884A - Device for the transmission of vibratory energy - Google Patents

Device for the transmission of vibratory energy Download PDF

Info

Publication number
US1663884A
US1663884A US711044A US71104424A US1663884A US 1663884 A US1663884 A US 1663884A US 711044 A US711044 A US 711044A US 71104424 A US71104424 A US 71104424A US 1663884 A US1663884 A US 1663884A
Authority
US
United States
Prior art keywords
armature
line
rubber
bar
transmission
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
US711044A
Other languages
English (en)
Inventor
Henry C Harrison
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to US711044A priority Critical patent/US1663884A/en
Application granted granted Critical
Publication of US1663884A publication Critical patent/US1663884A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/001—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor with vibrating mechanical coupling means between pick-up element and sound producing element
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/16—Mounting or connecting stylus to transducer with or without damping means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus

Definitions

  • This invention relates to mechanical sys-.
  • each portion of the line should have substantially the same characteristic impedance throughout the frequency range to be transmitted as the and following it.
  • the invention pro- 'vides an improved supporting and balancing means for an armature i n an electromagnetic high dissipative and 14, 15, preferably being secured by short stiff springs, and the balancing is accomplished by providing knee-shaped springs on each side of the pivot, the tension in the springs being adjusted by deforming them at the point olf support.
  • Fig. 1 is a front view
  • Fig. 2 a longitudinal sectional view
  • Fig. 3 a transverse sectional view of one embodiment of the invention.
  • Figs. 4 and 5 are detail views of the armature support.
  • Figs. 6 and 7 are a front view and a longitudinal sectional view, respectively. of another form of the invention.
  • Fig. 8 is a longitudinal sectional View of a modification of Fig. 2.
  • Figs. 9 and 10 are a longitudinal sectional View and a transverse sectional view, respectively, of another form of the invention.
  • Fig. 11 shows graphically the characteristics of the device of Figs. 9 and 10.
  • FIG. 1 there is shown an electromagnetic phonograph reproducer or recorder having a permanent magnetlO.
  • An electromagnet may, however, be used if desired.
  • Secured to the magnet 10 are soft iron pole pieces 12, 13
  • the armature 17 is mounted on an elongated bar 20, preferably e made to vary with the armaof a suitable aluminum alloy, and is'pro- 20/is held on its pivots andthe armature balanced, preferably by the4 resilient supporting and balancing means shown-in detail 1n Figs. 4 and5, and' described hereinafter.
  • a pair of windings 24and 25 are mountedcoaxially with the amature between the pole pieces and are connected by to a suitable electric circuit.
  • the bar 20 is turned downwardly at .its outer end to form a stylus holder 29, ih
  • the device may be used either as a recorder of speech and music or as a reproducer thereof.
  • a cord 42 or the like may be positioned atlany desired point within the rubber cylinder for tensioning the spring and thereby holding the rubber cylinder against a plate 34.
  • end A28 of the bar20 is preferably rectangular in cross-section and slightly tapered, and the plate 34 is provided with a rectangular hole in which the end 28 is held by the tension of the sprin 38 and the rubber tube 36.
  • the rubber cy inder or tube 36 is enclosed in a casing formed of channel-shaped members 45 and 43, and' is preferably. out of contact with the casing so as to avo1d so far as possible friction at the surface of the rubber, which would interfere with the transmission of the vibrationsl By making theein'side dimensions of the channel-shaped members 45 and therethrough.
  • the tngo may, however, vbe supportedits whole length by soft felt or cotton wrapping, as shown'in 7 or at its outer end by-a felt, a cotton or a spongerubber ring as shown in Fig. 8, For most cases, however, it is believed pref- ⁇ erable to reinforce the vtube 36 by a thin "metal strip 35, as shown in Figs. 9 andlIO..
  • the rubber line herein described is analo-l gous to a uniformly loaded electrical line.
  • any mechanical network is where r is mechanical resistance per unit
  • the rubber line 36 ' is in by a wrappmg 48 of soft fabric such as cot-. ⁇
  • g is the mechanical conductance in a unit section of the line and corresponds to the dielectric conductance, or leakage
  • m the electrical case
  • M is the mass corresponding to electrical inductance
  • S is the elastlcity per unit length corresponding to the reciprocal of the capacity in an electrical clrcult.
  • the conditions requisite for a mechanical line to have ⁇ a pure resistance characteristlc impedance are analogouslto those requlsite to an electrical network for pure resistance.
  • the velocity of the arma- In order that the velocities of the armature corresponds to the current in an electrical circuit.
  • the impedance may .therefore be made independent of the frequency, in'which case the velocity of the armature is a faithful copy of the mechanical force in the case of a reproducer or the electromagnetic force in therese of a recorder.
  • the rubber line should be olfconsiderable length. At least it shouldbe long enough to dissipate practically all 'the-energy imparted to it' before it is transmitted from one .end
  • the line would have a variable impedance and hence would not respond with equalmvelocities to equal forces at all frequencies. ⁇ If the -material used for ⁇ the line has a-small rate of dissipation of motional energy, the line ⁇ must be long, while if the material has a high rate of disslpationt,
  • the line. may be4 short. Excellent results -havebeen obtainedi by means of a cylindrical line of pure gum rubber nine inches long, one-halfsinch outside diameter and oneuarter inch inside diameter. It is obvious owever that other vibrationv dissipating materials than rubber might be used such as leather, felt, cork, spongy lead.
  • Figs. 6 and 7 show the application of the lnvention to an electromagnetic transmitter.
  • the arm 56 in this case is connected by means of a rod 46 to the usual diaphragm 47.
  • This case supported ton or felt, but itmay be supported by. any
  • this arran ement may be used as a loud speaking recelvei ⁇ it is preferablewhen Y length of the cylinder.
  • the rubber line is shown as gradually tapered from the arm 20. This taper may be reversed, depending upon the characteristics desired.
  • the reproducer may be supported on a comparatively heavy meta-l block 50 by a. yoke or U-shaped member 51 pivoted to the case 45 to permit vertical movement and to the block 50 to permit horizontal movement. This arrangement provides a convenient support for the re.- corder andthe reproducer, rendering them portable and readily attachable to any standard type of talking machine.
  • the disc 81 is held snugly against the cylinder 36 by means of a strip 35 of aluminum or other suitable material extending the One end of the strip 35 is secured by a rivet or other suitable means to the bar 20 and the tube is secured in place by a pin 52.
  • the tube 36 By slightly compressing the tube longitudinally, the proper' tension is provided to hold the parts together.
  • the tube 36 may be filled with comminuted material 53 of any desired mass. Small size lead shot has been found to give very satisfactory results.
  • the end of the tube may then be sealed by any suitable Fig.
  • FIG. 9 also shows the preferred arrangement for a recorder'.
  • the stylus bar 54C in this case is located between the armature 17 and the rubber line 36 and carries a cutting style 55.
  • a micrometer screw 57attached to the recorder' rests on the record 58 for gauging the depth of the cut in the record.
  • the supporting member 60 carries the knife edges 61 which engage the recesses 21 and the bar 2() to which the armature 17 is attached by any suitable, means.
  • the bar 20 is held on its knife-edge pivots by a thin rod 62 extending through the mounting 60 and the bar 20.
  • One end of the rod 62 is secured to the mounting 60 by means ofy a plate 63, Whichhas two opposing lugs 64 and 65 sheared from the plate. These lugs are bent outwardly and act as springs and engage the head 66 of the rod 62.
  • the opposite end of the rod 62 projects through the bar 20 and is threaded for a nut 67 to adjust the tensioning rod 62 and the springs 64 and 65.
  • resilient members 68 and 69 are attached to the bar 20 on each side of a pivot. Members 68 arrangement for supportthe armature is shown 1n.
  • the mounting 60 is provided with transverse slots or grooves 72 and 73, into which the springs may be deformed under the pressure of ynuts 74 and 75 to regulate the tension therein and effect a balance of the armar.
  • Fig. -11 shows curves comparing the characteristics of recordersl with and without the rubber line of the invention.
  • the curves are plotted .with velocity in transmission units as ordinates and frequency at constant driving current as abscissae.
  • a transmission unit is defined by the relation.
  • Curve A is a typical curve showing the characteristic of an improved type ofl damped recorder. It will be noted that although damping was applied in this case,
  • VV-hat is claimed is: 1.
  • a solid medium for receiving and dissiusual type y pating vibrator-y energy comprising an elon- ⁇ gated body of non-metallic vibration absorb- 1n material of a "homogeneous character;E
  • sald body having precomputed values o mass, elasticit reslstance and d1ss1pat1on per unit'len t i such that the characteristic impedance o saidfbody is substantially const ant throughout a range of frequencies to v be transmitted.
  • a solid medium for receiving and d1ss1- pating vibratory energy according Yto claim A 1 in which said mass, elasticity, resistance, and dissi ation are uniformly distributed t throughout the length of said body. 4
  • a terminatingportion cpm prising an elongated body of vibratlon d1ss1- patingfmaterial, and means for torsionally vibrating said homogeneous body.
  • a terminating portion therefor comprising an elongated homogeneous l body of vibration-dissipating material having a characteristic impedance substantially equal to thaty of said line throughout a range ture, means for pivotally supporting said armature, an elongated homogeneous body of vibration dissipating material, the axis of said body being in alignment with the axis of oscillation of said yarmature and means securing said/ body to said armature for rotation therewith.
  • an armature an elongated member receiving torsional forces from the vibrationI of said armature, a mechanical line of a homogeneous material having a high degree of dissipation connected to the end of sald member remote from said armature, and a recording stylus connected to an intermediate point on said p member.
  • a pivoted armature a mounting for said armature, means for supporting said armature-on its pivots, said means comprising a thinflexible rod extending through the axis of su'pport of "said mounting, and a short spring transverse and engaging said rod to yieldingly maintain said rod under tension.
  • An electromagnetic system comprising an armature, a bar supporting said armature, a mounting pivotally lsupporting said ss f bar, tensioning means securing said bar on 1 its pivots, a palr of springs extending from said armature support to said mounting, and means for distorting said sprin transversely tov vary the tension in sai effecting -a balance of said armature.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Vibration Prevention Devices (AREA)
  • Mobile Radio Communication Systems (AREA)
US711044A 1924-05-05 1924-05-05 Device for the transmission of vibratory energy Expired - Lifetime US1663884A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US711044A US1663884A (en) 1924-05-05 1924-05-05 Device for the transmission of vibratory energy

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US711044A US1663884A (en) 1924-05-05 1924-05-05 Device for the transmission of vibratory energy
GB18973/25A GB262839A (en) 1925-07-25 1925-07-25 Improvements in vibratory systems

Publications (1)

Publication Number Publication Date
US1663884A true US1663884A (en) 1928-03-27

Family

ID=10121612

Family Applications (1)

Application Number Title Priority Date Filing Date
US711044A Expired - Lifetime US1663884A (en) 1924-05-05 1924-05-05 Device for the transmission of vibratory energy

Country Status (5)

Country Link
US (1) US1663884A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH122103A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR605442A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB262839A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL18285C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3531601A (en) * 1968-06-26 1970-09-29 Sonotone Corp Phonograph pickup cartridge with selectively settable compliance
US3576955A (en) * 1967-08-22 1971-05-04 Matsushita Electric Ind Co Ltd Armature assembly for magnetic-type phonograph pickup
US3761647A (en) * 1968-08-14 1973-09-25 Audio Technica Kk Cartridge for detecting vibrations representing stereophonic sound

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3576955A (en) * 1967-08-22 1971-05-04 Matsushita Electric Ind Co Ltd Armature assembly for magnetic-type phonograph pickup
US3531601A (en) * 1968-06-26 1970-09-29 Sonotone Corp Phonograph pickup cartridge with selectively settable compliance
US3761647A (en) * 1968-08-14 1973-09-25 Audio Technica Kk Cartridge for detecting vibrations representing stereophonic sound

Also Published As

Publication number Publication date
FR605442A (fr) 1926-05-26
GB262839A (en) 1926-11-25
NL18285C (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1928-07-16
CH122103A (de) 1927-09-01

Similar Documents

Publication Publication Date Title
US1678116A (en) Device for the transmission of mechanical vibratory energy
GB2162718A (en) Electro-vibration transducer
GB1500055A (en) Headphone
US2380514A (en) Vibration-translating device
US2037255A (en) Electromagnetic translating device
US1573739A (en) Telephonic device
US1663884A (en) Device for the transmission of vibratory energy
US2982819A (en) Artificial reverberation apparatus
US2491794A (en) Variable resistance phonograph pickup
US2032194A (en) Vibration translating device
US2441651A (en) Phonograph recording head
US3311712A (en) Sonic transducer
US1905669A (en) Vibration translating device
US2106051A (en) Electromechanical translating device
US1944258A (en) Sound reproducing instrument
US1669170A (en) Damped phonograph apparatus
US2510342A (en) Pickup mounting
US2621260A (en) Electrical sound recording, reproducing, and like apparatus
US2608265A (en) Ribbon-type microphone diaphragm
US3193627A (en) High fidelity loudspeakers
US2776342A (en) High fidelity phonograph stylus assembly
US2213936A (en) Electrodynamic pickup
US1733013A (en) Sound-reproducing device
US2238863A (en) Translation device for phonographs
US2534725A (en) Electrodynamic pickup hearing u-shaped coil holder