US3163723A - Damping means for magnetic translating device - Google Patents

Damping means for magnetic translating device Download PDF

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Publication number
US3163723A
US3163723A US210338A US21033862A US3163723A US 3163723 A US3163723 A US 3163723A US 210338 A US210338 A US 210338A US 21033862 A US21033862 A US 21033862A US 3163723 A US3163723 A US 3163723A
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Prior art keywords
armature
translating device
magnetic
folded
magnetic translating
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US210338A
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George C Tibbetts
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Tibbetts Industries Inc
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Tibbetts Industries Inc
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    • 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

Definitions

  • a damping means attached to a substantially nou-vibratory portion of a magnetic translating device and leading therefrom into fixed relation with a vibratory portion of the armature of the translating device.
  • the undesirable resonance to be damped is generally the second normal mode of vibration in iiexure.
  • the frequency of the second normal mode is roughly six times the frequency of the fundamental or first normal mode, and thus the former is usually above the upper cutoff frequency of the translating device yand thus of no detrimental effect.
  • the problem arises in the magnetic translating device of copending application Serial No. 168,183, tiled January 23, 1962. In that device the armature is folded rather than straight, and is free to vibrate throughout its length, including the folded region.
  • the frequency of the second normal mode may be less than twice the fundamental frequency, and thereby may introduce a severe dip in the response of the translating device below its upper cutoff frequency, thus necessitating correction by some means. That means is provided by the damping means of the present invention.
  • FIG l. is a sectional schematic view of the invention
  • FIG. 2 is a sectional view of the invention applied to a magnetic translating device along line 2-2 of FIG. 3;
  • FIG. 3 is a plan view of the invention in a magnetic translating device lalong line 3--3 of FIG. 2.
  • the invention is shown schematically in a preferred embodiment as a member 1 of damping material suitable for such purpose, preferably a highly plasticized vinyl; however any plasticized thermoplastic, silicone gel, elastomer or other flexible material having a lossy elastic modulus may be employed.
  • the member has one end secured to a substantially fixed portion 2 of a magnetic translating device generally of the form disclosed in the aforesaid copending application, and the other end secured to fthe armature 3 of such translating device in the vicinity of the folded region of the armature.
  • the member may be secured by suitable attaching means such as a solvent type adhesive.
  • FIGS. 2 and 3 show the invention applied in the particular embodiment of the magnetic translating device disclosed in the aforesaid application.
  • This device comprises a casing 4, a folded armature 5 having one end fixed in a recess in plate 18 as by spot welding, the end 7 of the armature being free to vibrate between the upper and lower magnets 8 land 9 with pole pieces lltl and ill having tapered faces.
  • the device may include a coil 12 through which the armature passes.
  • a drive pin 13 has a lower tongue extending through a circular hole in the free end of the armature and passes through armature hole 14 to a further driven or driving element such as the diaphragm of a microphone or idfz?,
  • Patented ec. 29, i964 receiver Vernier or fine magnetic adjustment disk 15 with slug le thereon is adjusted and then ixed in position to the case as by epoxy bonding.
  • the magnets 3 and 9 extend laterally of the plane of the free end of the armature on opposite sides thereof and are magnetized approximately perpendicular to the plane of said free end of the armature and have opposite poles facing each other across the gap in which the free end of the armature vibrates.
  • a damping member 17 has one end mounted in a recess in the substantially fixed plate 18 and the other end secured to the armature 5 in the vicinity of the folded portion.
  • the attachment of the damping member to the other parts of the device is preferably by an adhesive which does not appreciably swell the damping material, so as to avoid distortion of Ithe damping member during bonding.
  • the armature remains substantially free to vibrate throughout its full folded extent but is prevented from unduly building up undesirable amplitude of vibration in the second normal mode. Similar damping means may be provided at somewhat different locations along the armature, but in the vicinity of the folded portion of the armature, either instead of or in addition to that shown. ⁇
  • a damping member for a magnetic translating devi which has a folded armature having a fixed end and an end free to vibrate, comprising an element of vibration damping material having one portion attached to a substantially lixed portion of a magnetic translating device and having another portion attached to the armature between the fixed and free ends thereof in the vicinity of the folded region.
  • a magnetic translating device having an armature extending along the device from -a fixed end of the armature, turning around, and then extending back along the device to an end of the armature free to vibrate, the irnprovement comprising a ldamping means secured to the armature in the vicinity of the turn-around portion and extending to a substantially fixed portion of the device.
  • damping means secured to the armature in the vicinity of the folded portion'and extending to a substantially iixed portion of the device, wherein the damping means is a member of plasticized thermoplastic.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Vibration Prevention Devices (AREA)

Description

De@ 29, 1964 s. c. TIBBr-:T'rs 3,163,723
DAMEING MEANS FOR MAGNETIC .TRANSLATING DEVICE Filed July 17, 1962 Izzi.
nited f ares l t This invention concerns damping means utilized to reduce undesirable resonances in magnetic translating devices having vibratory armatures.
Accordingly, it is an object of this invention to provide a damping means attached to a substantially nou-vibratory portion of a magnetic translating device and leading therefrom into fixed relation with a vibratory portion of the armature of the translating device. The undesirable resonance to be damped is generally the second normal mode of vibration in iiexure. In ordinary magnetic translating devices having straight armatures, the frequency of the second normal mode is roughly six times the frequency of the fundamental or first normal mode, and thus the former is usually above the upper cutoff frequency of the translating device yand thus of no detrimental effect. The problem arises in the magnetic translating device of copending application Serial No. 168,183, tiled January 23, 1962. In that device the armature is folded rather than straight, and is free to vibrate throughout its length, including the folded region. In such case, the frequency of the second normal mode may be less than twice the fundamental frequency, and thereby may introduce a severe dip in the response of the translating device below its upper cutoff frequency, thus necessitating correction by some means. That means is provided by the damping means of the present invention.
The above and further objects Will be more readily apparent by reference to the following specification and drawings in which FIG l. is a sectional schematic view of the invention;
FIG. 2 is a sectional view of the invention applied to a magnetic translating device along line 2-2 of FIG. 3; and
FIG. 3 is a plan view of the invention in a magnetic translating device lalong line 3--3 of FIG. 2.
Referring to FIG. l, the invention is shown schematically in a preferred embodiment as a member 1 of damping material suitable for such purpose, preferably a highly plasticized vinyl; however any plasticized thermoplastic, silicone gel, elastomer or other flexible material having a lossy elastic modulus may be employed. The member has one end secured to a substantially fixed portion 2 of a magnetic translating device generally of the form disclosed in the aforesaid copending application, and the other end secured to fthe armature 3 of such translating device in the vicinity of the folded region of the armature. The member may be secured by suitable attaching means such as a solvent type adhesive.
FIGS. 2 and 3 show the invention applied in the particular embodiment of the magnetic translating device disclosed in the aforesaid application. This device comprises a casing 4, a folded armature 5 having one end fixed in a recess in plate 18 as by spot welding, the end 7 of the armature being free to vibrate between the upper and lower magnets 8 land 9 with pole pieces lltl and ill having tapered faces. When utilized as a transducer the device may include a coil 12 through which the armature passes. A drive pin 13 has a lower tongue extending through a circular hole in the free end of the armature and passes through armature hole 14 to a further driven or driving element such as the diaphragm of a microphone or idfz?,
Patented ec. 29, i964 receiver. Vernier or fine magnetic adjustment disk 15 with slug le thereon is adjusted and then ixed in position to the case as by epoxy bonding.
The magnets 3 and 9 extend laterally of the plane of the free end of the armature on opposite sides thereof and are magnetized approximately perpendicular to the plane of said free end of the armature and have opposite poles facing each other across the gap in which the free end of the armature vibrates. According to this embodiment of the invention a damping member 17 has one end mounted in a recess in the substantially fixed plate 18 and the other end secured to the armature 5 in the vicinity of the folded portion. The attachment of the damping member to the other parts of the device is preferably by an adhesive which does not appreciably swell the damping material, so as to avoid distortion of Ithe damping member during bonding. The armature remains substantially free to vibrate throughout its full folded extent but is prevented from unduly building up undesirable amplitude of vibration in the second normal mode. Similar damping means may be provided at somewhat different locations along the armature, but in the vicinity of the folded portion of the armature, either instead of or in addition to that shown.`
It should be undenstood that the present disclosure is for the purpose of illustration only and that this invention includes all modifications and equivalents which fall within the scope of the appended claims.
l claim:
l. A damping member for a magnetic translating devi which has a folded armature having a fixed end and an end free to vibrate, comprising an element of vibration damping material having one portion attached to a substantially lixed portion of a magnetic translating device and having another portion attached to the armature between the fixed and free ends thereof in the vicinity of the folded region.
2. In combination with a magnetic translating device having a folded armature with a fixed end and an end free to vibrate, the improvement comprisinga member of damping material having one part secured'to ya substantially xed portion of the translating device and having another part secured to the `armature of said device between the ends thereof in the vicinity of the folded region.
3. The improvement recited in claim 2 wherein the damping member is secured to the portions of the translating device by adhesive.
4. Thevimprovement recited in claim 2 wherein the material is plasticized thermoplastic.
5. In a magnetic translating device having an armature extending along the device from -a fixed end of the armature, turning around, and then extending back along the device to an end of the armature free to vibrate, the irnprovement comprising a ldamping means secured to the armature in the vicinity of the turn-around portion and extending to a substantially fixed portion of the device.
6. In a magnetic translating device having a folded armature, fthe improvement comprising damping means secured to the armature in the vicinity of the folded portion'and extending to a substantially iixed portion of the device, wherein the damping means is a member of plasticized thermoplastic.
References Cited bythe Examiner UNITED STATES PATENTS ROBERT H. ROSE, Primary Examiner.

Claims (1)

1. A DAMPING MEMBER FOR A MAGNETIC TRANSLATING DEVICE WHICH HAS A FOLDED ARMATURE HAVING A FIXED END AND AN END FREE TO VIBRATE, COMPRISING AN ELEMENT OF VIBRATION DAMPING MATERIAL HAVING ONE PORTION ATTACHED TO A SUBSTANTIALLY FIXED PORTION OF A MAGNETIC TRANSLATING DEVICE AND HAVING ANOTHER PORTION ATTACHED TO THE ARMATURE BETWEEN THE FIXED AND FREE ENDS THEREOF IN THE VICINITY OF THE FOLDED REGION.
US210338A 1962-07-17 1962-07-17 Damping means for magnetic translating device Expired - Lifetime US3163723A (en)

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3347991A (en) * 1964-03-17 1967-10-17 Industrial Res Prod Inc Shock resistant transducer
US3560667A (en) * 1968-05-01 1971-02-02 Industrial Research Prod Inc Transducer having an armature arm split along its length
US3686446A (en) * 1968-12-19 1972-08-22 Manger J W Push-pull moving coil loudspeaker having electromagnetic centering means
US6075870A (en) * 1996-12-02 2000-06-13 Microtronic B.V. Electroacoustic transducer with improved shock resistance
EP1077586A2 (en) * 1999-08-16 2001-02-21 Microtronic Nederland B.V. Shock improvement for an electroacoustic transducer
US6526153B2 (en) 2001-02-08 2003-02-25 Tibbetts Industries, Inc. Armature assembly for balanced moving armature magnetic transducer and method of locating and adjusting same
US7065224B2 (en) 2001-09-28 2006-06-20 Sonionmicrotronic Nederland B.V. Microphone for a hearing aid or listening device with improved internal damping and foreign material protection
US7072482B2 (en) 2002-09-06 2006-07-04 Sonion Nederland B.V. Microphone with improved sound inlet port
US7236609B1 (en) 1999-10-07 2007-06-26 Knowles Electronics, Llc. Electro-acoustic transducer with resistance to shock-waves
US9859879B2 (en) 2015-09-11 2018-01-02 Knowles Electronics, Llc Method and apparatus to clip incoming signals in opposing directions when in an off state
US10945077B2 (en) 2017-12-30 2021-03-09 Knowles Electronics, Llc Electroacoustic transducer with improved shock protection
US11659337B1 (en) 2021-12-29 2023-05-23 Knowles Electronics, Llc Balanced armature receiver having improved shock performance

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1573739A (en) * 1922-10-02 1926-02-16 O'neill John Hugh Telephonic device
US3076062A (en) * 1959-10-30 1963-01-29 Dyna Magnetic Devices Inc Hearing-aid sound transducer

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1573739A (en) * 1922-10-02 1926-02-16 O'neill John Hugh Telephonic device
US3076062A (en) * 1959-10-30 1963-01-29 Dyna Magnetic Devices Inc Hearing-aid sound transducer

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3347991A (en) * 1964-03-17 1967-10-17 Industrial Res Prod Inc Shock resistant transducer
US3560667A (en) * 1968-05-01 1971-02-02 Industrial Research Prod Inc Transducer having an armature arm split along its length
US3686446A (en) * 1968-12-19 1972-08-22 Manger J W Push-pull moving coil loudspeaker having electromagnetic centering means
US6075870A (en) * 1996-12-02 2000-06-13 Microtronic B.V. Electroacoustic transducer with improved shock resistance
US6658134B1 (en) 1999-08-16 2003-12-02 Sonionmicrotronic Nederland B.V. Shock improvement for an electroacoustic transducer
EP1077586A2 (en) * 1999-08-16 2001-02-21 Microtronic Nederland B.V. Shock improvement for an electroacoustic transducer
EP1077586A3 (en) * 1999-08-16 2004-11-10 Microtronic Nederland B.V. Shock improvement for an electroacoustic transducer
US7236609B1 (en) 1999-10-07 2007-06-26 Knowles Electronics, Llc. Electro-acoustic transducer with resistance to shock-waves
US20070258616A1 (en) * 1999-10-07 2007-11-08 Knowles Electronics, Llc Electroacoustic transducer with resistance to shock-waves
US7995789B2 (en) 1999-10-07 2011-08-09 Knowles Electronics, Llc Electroacoustic transducer with resistance to shock-waves
US6763571B2 (en) * 2001-02-08 2004-07-20 Tibbetts Industries, Inc. Armature assembly for balanced moving armature magnetic transducer and method of locating and adjusting same
US20030138114A1 (en) * 2001-02-08 2003-07-24 Tibbetts Industries, Inc. Armature assembly for balanced moving armature magnetic transducer and method of locating and adjusting same
US6526153B2 (en) 2001-02-08 2003-02-25 Tibbetts Industries, Inc. Armature assembly for balanced moving armature magnetic transducer and method of locating and adjusting same
US7065224B2 (en) 2001-09-28 2006-06-20 Sonionmicrotronic Nederland B.V. Microphone for a hearing aid or listening device with improved internal damping and foreign material protection
US7072482B2 (en) 2002-09-06 2006-07-04 Sonion Nederland B.V. Microphone with improved sound inlet port
US9859879B2 (en) 2015-09-11 2018-01-02 Knowles Electronics, Llc Method and apparatus to clip incoming signals in opposing directions when in an off state
US10945077B2 (en) 2017-12-30 2021-03-09 Knowles Electronics, Llc Electroacoustic transducer with improved shock protection
US11659337B1 (en) 2021-12-29 2023-05-23 Knowles Electronics, Llc Balanced armature receiver having improved shock performance

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