US3366749A - Audio transducer - Google Patents

Audio transducer Download PDF

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Publication number
US3366749A
US3366749A US358475A US35847564A US3366749A US 3366749 A US3366749 A US 3366749A US 358475 A US358475 A US 358475A US 35847564 A US35847564 A US 35847564A US 3366749 A US3366749 A US 3366749A
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Prior art keywords
post
coil
pole piece
audio transducer
rod
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Expired - Lifetime
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US358475A
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Ries Hugo
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Priority to US358475A priority Critical patent/US3366749A/en
Priority to GB55132/67A priority patent/GB1201359A/en
Priority to AU30706/67A priority patent/AU425651B2/en
Priority to DE1537581A priority patent/DE1537581B2/en
Priority to CH1758767A priority patent/CH482260A/en
Priority to NL6717439A priority patent/NL6717439A/xx
Priority to BE708438A priority patent/BE708438A/xx
Application granted granted Critical
Publication of US3366749A publication Critical patent/US3366749A/en
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06—Loudspeakers
    • H04R9/066—Loudspeakers using the principle of inertia

Definitions

  • a sound-producing device having a post adapted to be rigidly atlixed, by one end, to a sounding board, a voice coil mounted on said board, a permanent magnet assembly coaxial with the coil with one pole piece around and on the outside of the coil and a second pole piece within the coil, the post extending through a clearance hole in the latter pole piece, and means resiliently mounting the magnet on the post.
  • This invention relates to an audio transducer for producing sound in a sounding board member on which the transducer is mounted.
  • An object of the present invention is to provide a transducer that converts the electrical impulses received from a sound head or similar source into dynamic movement of a coil unit, the movement of the latter imparting conforming vibration to a post on which the transducer is mounted and which, in turn, is affixed to the sounding board member. The latter, thereby, produces sound translated from said electric impulses.
  • Another object of the invention is to provide a transducer in which the mass of the magnetic components thereof has inertia that causes a reactive vibratory movement in the post on which the same is mounted.
  • a further object of the invention is to provide an audio transducer, as above characterized, provided with a resilient interconnection between the post and magnetic components through which the vi-bratory drive of the post is effected.
  • This invention also has for its objects to provide such means that are positive in operation, convenient in use, easily installed in a working position and easily disconnected therefrom, economical of manufacture, relatively simple, and of general superiority and serviceability.
  • the invention also comprises novel details of construction and novel combinations and arrangements of parts, which will more fully appear in the course of the following description, and which is based on the accompanying drawing.
  • said drawing merely shows, and the following description merely describes, one embodiment of the present invention, which is given by way of illustration or example only.
  • FIG. l is a top plan view, partly broken, of an audio transducer according to the present invention.
  • FIG. 2 is a cross-sectional View as taken on the line 2 2 of FIG. 1.
  • the audio transducer of the present invention is shown as mounted on a sounding board member 5 which may be of any suitable material, as wood, plastic or metal, so long as the same is capable of sound-producing vibration.
  • the present transducer comprises, generally, a mounting post 6 that is aixed to the member 5, a coil unit 7 carried by the post 6, a permanent magnet assembly 8, and oppositely arranged resilient means 9 mounting said assembly 8 on the post 6.
  • the post 6 is shown as an externally threaded rod 10 of a diametral size to be inexible.
  • Said rod is preferably made of brass or other non-magnetic material.
  • a plate 11 is shown as threadedly connected to one end of said rod 10, suitable screws or other fastener elements ⁇ 12 connecting said plate to the sounding board 5.
  • This arrangement of rod, plate and sounding board provides for said end of the rod being directed toward the sounding board and enabling a tight and preferably recessed or indented engagement of the rod with the sounding board, merely by turning the rod so the threads thereof tighten in the plate 11.
  • the above describes an exemplary manner of rigidly aiixing the post 6 to the sounding board 5.
  • the coil unit 7 is mounted on the rod 10 of the post 6, a nut 13 threadedly engaged with the rod being provided for effecting longitudinal adjustment of said unit on the rod.
  • Said unit 7 is shown as a non-magnetic cup 14 that is staked to the nut 13 and has a cylindrical outer wall 15 concentric with the axis of said rod, and a voice coil 16 wound on said wall 15.
  • Said coil in the usual manner, has conductor leads 17 that connect to a sound head or other such device. It will be understood that electro-magnetic impulses are brought to the coil by said leads 17.
  • the permanent magnet assembly is shown as a ring permanent magnet 18 preferably of the ceramic-alloy type typically having opposite polarity at the outer and inner circumferential portions thereof. Such poles are indicated on magnet 18 in FIG. 2. Opposite ring-shaped, soft iron pole pieces 19 and 20 are applied to the opposite side faces of the magnet 18, thereby producing an assembly in which the magnet and pole pieces form a three-layer arrangement, clearly shown in FIG. 2.
  • the inner peripheral surface 21 of the pole piece 19 is larger than the outer peripheral surface of the coil 16, providing a gap 'between said surfaces, as shown.
  • the pole piece 20 is provided at its central part with a projecting pole 22 that extends in-to the interior of the wall 15 of the cup 14 with an annular gap between said pole 22 and said cup wall.
  • the rod 10 extends through a clearance hole in the pole 22.
  • the coil 16 is disposed in the magnetic field between the pole piece 19 and the pole 22 and that the non-magnetic cup 14 serves only as a carrier for the coil, having no magnetic elect on the ield, as above described.
  • the resilient mounting means 9 is shown as a threearmed, non-magnetic, ilexible spider 23 staked at its center to the nut 13 and connected to the pole piece 19 by screws 24 that fasten the ends of the spider arms 25 to the outer portion of said pole piece, and a similar threearmed, non-magnetic, flexible spider 26 staked at its center to a nut 27 on the rod 10 and connected to the pole piece 20 by screws 28 that fasten -the ends of the spider arms 29 to the outer portion of said latter pole piece.
  • the magnet assembly is resiliently carried by the post 6, the lat-ter vibrating, due to impulses of the voice coil, relative to the mass of the magnet assembly, the latter, by reaction, moving on its resilient connection 9 with the post 6.
  • the amount of the relative reaction movements of the magnet assembly 8 and post 6 may be regulated by first mounting the magnet assembly on the post 6 by means of the spider 23, and then, when applying the spider 26 to said post and before applying the screws 28, setting said spider on the post ⁇ 6 relative to the spider 23, so as to inwardly flex the respective arms 25 and 29, as desired, and accordingly increasing or decreasing the resilience of the magnet mount.
  • the greater the flexure of the spiders the higher the pitch of the sound produced in the sounding board 5.
  • Such change in resilience of the spider arms may also be effected by locating the nut 27 in such spaced relation to the magnet assembly 8 that it will be necessary to lex the arms thereof toward the pole piece 20 before the screws can be applied.
  • the spider arms 25 and 29 will thus be exed oppositely outwardly from their inward flexure, as above described.
  • the mounting spiders may be set to control pitch of the sound produced by the vibrating member 5.
  • An audio transducer comprising,
  • the second pole piece having an axial bore therethrough and the post extending freely through said bore and out of contact with the bore wall, said post and magnet assembly having relative vibratory reaction movements in response to electrical impulses in said coil.
  • An audio transducer in which an annular space is provided between the pole pieces, and a cup of non-magnetic material mounts the coil on the post in said annular space with gaps separating said coil from the pole pieces.
  • each flexible mounting means comprises a non-magnetic spider member with radial flexible arms.
  • An audio transducer according to claim 1 in which means are interposed between the exible mounting means and the post and adjustably engaged with the post to adjust the degree of flexure of the ilexible mounting means.
  • An audio transducer comprising:

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Multimedia (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Description

1m30, 1961sA H. RES 3,366,749
AUDIO TRANSDUCER Filed April 9, 1954 INVENTOR HUG /E B wfj fram/5y Patented Jan. 30, 1968 3,366,749 AUDIO TRANSDUCER Hugo Ries, Los Angeles, Calif., assignor of one-half to Alan A. Allen, Los Angeles, and one-half to Harry Z. Marx, La Jolla, Calif.
Filed Apr. 9, 1964, Ser. No. 358,475 Claims. (Cl. 179-1155) ABSTRACT OF THE DISCLOSURE A sound-producing device having a post adapted to be rigidly atlixed, by one end, to a sounding board, a voice coil mounted on said board, a permanent magnet assembly coaxial with the coil with one pole piece around and on the outside of the coil and a second pole piece within the coil, the post extending through a clearance hole in the latter pole piece, and means resiliently mounting the magnet on the post.
This invention relates to an audio transducer for producing sound in a sounding board member on which the transducer is mounted.
An object of the present invention is to provide a transducer that converts the electrical impulses received from a sound head or similar source into dynamic movement of a coil unit, the movement of the latter imparting conforming vibration to a post on which the transducer is mounted and which, in turn, is affixed to the sounding board member. The latter, thereby, produces sound translated from said electric impulses.
Another object of the invention is to provide a transducer in which the mass of the magnetic components thereof has inertia that causes a reactive vibratory movement in the post on which the same is mounted.
A further object of the invention is to provide an audio transducer, as above characterized, provided with a resilient interconnection between the post and magnetic components through which the vi-bratory drive of the post is effected.
This invention also has for its objects to provide such means that are positive in operation, convenient in use, easily installed in a working position and easily disconnected therefrom, economical of manufacture, relatively simple, and of general superiority and serviceability.
The invention also comprises novel details of construction and novel combinations and arrangements of parts, which will more fully appear in the course of the following description, and which is based on the accompanying drawing. However, said drawing merely shows, and the following description merely describes, one embodiment of the present invention, which is given by way of illustration or example only.
In the drawing, like reference characters designate similar parts in the several views.
FIG. l is a top plan view, partly broken, of an audio transducer according to the present invention.
FIG. 2 is a cross-sectional View as taken on the line 2 2 of FIG. 1.
The audio transducer of the present invention is shown as mounted on a sounding board member 5 which may be of any suitable material, as wood, plastic or metal, so long as the same is capable of sound-producing vibration.
The present transducer comprises, generally, a mounting post 6 that is aixed to the member 5, a coil unit 7 carried by the post 6, a permanent magnet assembly 8, and oppositely arranged resilient means 9 mounting said assembly 8 on the post 6.
The post 6 is shown as an externally threaded rod 10 of a diametral size to be inexible. Said rod is preferably made of brass or other non-magnetic material. A plate 11 is shown as threadedly connected to one end of said rod 10, suitable screws or other fastener elements `12 connecting said plate to the sounding board 5. This arrangement of rod, plate and sounding board provides for said end of the rod being directed toward the sounding board and enabling a tight and preferably recessed or indented engagement of the rod with the sounding board, merely by turning the rod so the threads thereof tighten in the plate 11. The above describes an exemplary manner of rigidly aiixing the post 6 to the sounding board 5.
The coil unit 7 is mounted on the rod 10 of the post 6, a nut 13 threadedly engaged with the rod being provided for effecting longitudinal adjustment of said unit on the rod. Said unit 7 is shown as a non-magnetic cup 14 that is staked to the nut 13 and has a cylindrical outer wall 15 concentric with the axis of said rod, and a voice coil 16 wound on said wall 15. Said coil, in the usual manner, has conductor leads 17 that connect to a sound head or other such device. It will be understood that electro-magnetic impulses are brought to the coil by said leads 17.
The permanent magnet assembly is shown as a ring permanent magnet 18 preferably of the ceramic-alloy type typically having opposite polarity at the outer and inner circumferential portions thereof. Such poles are indicated on magnet 18 in FIG. 2. Opposite ring-shaped, soft iron pole pieces 19 and 20 are applied to the opposite side faces of the magnet 18, thereby producing an assembly in which the magnet and pole pieces form a three-layer arrangement, clearly shown in FIG. 2. The inner peripheral surface 21 of the pole piece 19 is larger than the outer peripheral surface of the coil 16, providing a gap 'between said surfaces, as shown. The pole piece 20 is provided at its central part with a projecting pole 22 that extends in-to the interior of the wall 15 of the cup 14 with an annular gap between said pole 22 and said cup wall. The rod 10 extends through a clearance hole in the pole 22.
It will be seen that the coil 16 is disposed in the magnetic field between the pole piece 19 and the pole 22 and that the non-magnetic cup 14 serves only as a carrier for the coil, having no magnetic elect on the ield, as above described.
The resilient mounting means 9 is shown as a threearmed, non-magnetic, ilexible spider 23 staked at its center to the nut 13 and connected to the pole piece 19 by screws 24 that fasten the ends of the spider arms 25 to the outer portion of said pole piece, and a similar threearmed, non-magnetic, flexible spider 26 staked at its center to a nut 27 on the rod 10 and connected to the pole piece 20 by screws 28 that fasten -the ends of the spider arms 29 to the outer portion of said latter pole piece.
In the above manner, the magnet assembly is resiliently carried by the post 6, the lat-ter vibrating, due to impulses of the voice coil, relative to the mass of the magnet assembly, the latter, by reaction, moving on its resilient connection 9 with the post 6.
The amount of the relative reaction movements of the magnet assembly 8 and post 6 may be regulated by first mounting the magnet assembly on the post 6 by means of the spider 23, and then, when applying the spider 26 to said post and before applying the screws 28, setting said spider on the post `6 relative to the spider 23, so as to inwardly flex the respective arms 25 and 29, as desired, and accordingly increasing or decreasing the resilience of the magnet mount. The greater the flexure of the spiders, the higher the pitch of the sound produced in the sounding board 5. Such change in resilience of the spider arms may also be effected by locating the nut 27 in such spaced relation to the magnet assembly 8 that it will be necessary to lex the arms thereof toward the pole piece 20 before the screws can be applied. The spider arms 25 and 29 will thus be exed oppositely outwardly from their inward flexure, as above described.
Regardless how exed, the mounting spiders may be set to control pitch of the sound produced by the vibrating member 5.
While the foregoing has illustrated and described what is now contemplated to. be the best mode of carrying out the invention, the construction is, of course, subject to modification without departing from the spirit and scope of the invention. Therefore, it is not desired to restrict the invention to the particular form of construction illustrated and described, but to cover all modifications that may fall within the scope of the appended claims.
Having thus described the invention, what is claimed and desired to be secured by Letters Patent is:
1. An audio transducer comprising,
(a) a post adapted to be iixedly engaged by one end to a sounding board,
(b) an annular voice coil coaxially carried by said post and spaced radially therefrom,
(c) a permanent magnet assembly having one pole piece coaxial with said voice coil and spaced radially outwardly therefrom and a second pole piece radially spaced from and within said annular voice coil, and
(d) a rst resilient flexible mounting means on said post resiliently supporting said one pole piece,
(e) a second resilient exible mounting means on said post spaced axially from said rst mounting means, resiliently supporting said Second pole piece,
(f) the second pole piece having an axial bore therethrough and the post extending freely through said bore and out of contact with the bore wall, said post and magnet assembly having relative vibratory reaction movements in response to electrical impulses in said coil.
2. An audio transducer according to claim 1 in which an annular space is provided between the pole pieces, and a cup of non-magnetic material mounts the coil on the post in said annular space with gaps separating said coil from the pole pieces.
3. An audio transducer according to claim 1 in which each flexible mounting means comprises a non-magnetic spider member with radial flexible arms.
4. An audio transducer according to claim 1 in which means are interposed between the exible mounting means and the post and adjustably engaged with the post to adjust the degree of flexure of the ilexible mounting means.
5. An audio transducer comprising:
(a) an axial member adapted to be lixedly engaged at one end to a sounding board,
(b) a voice coil concentrically carried by said member and radially spaced therefrom,
(c) a permanent magnet with one pole around and on the outside of the voice coil and the other pole thereof within said coil, said magnet between its poles being disposed along the axis of said axial member and along said axis at a position beyond the coil with respect to the point of engagement of the axial member with the sounding board, and
(d) resilient means extending from said axial member and having peripheral portions engaged with and mounting said magnet,
(e) the axial member and the magnet having relative reaction movements in response to electrical impulses in the coil,
(f) said axial member sewing as the sole support for said magnet and voice coil.
References Cited UNITED STATES PATENTS 2,341,275 2/1944 Holland 179-1155 2,756,281 7/ 1956 `Pittinger 179-1155 2,862,069 ll/l958 Marchand 179-1155 3,125,647 3/1964 Rowy 179-1155 3,236,958 2/1966 Cohen 179-1155 KATHLEEN H. CLAFFY, Primary Examiner.
A. A. MCGILL, Assistant Examiner.
US358475A 1964-04-09 1964-04-09 Audio transducer Expired - Lifetime US3366749A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US358475A US3366749A (en) 1964-04-09 1964-04-09 Audio transducer
GB55132/67A GB1201359A (en) 1964-04-09 1967-12-04 Audio-transducer
AU30706/67A AU425651B2 (en) 1964-04-09 1967-12-05 Audio transducer
DE1537581A DE1537581B2 (en) 1964-04-09 1967-12-13 Electroacoustic transducer arrangement
CH1758767A CH482260A (en) 1964-04-09 1967-12-15 Electro-acoustic converter
NL6717439A NL6717439A (en) 1964-04-09 1967-12-21
BE708438A BE708438A (en) 1964-04-09 1967-12-22

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Application Number Priority Date Filing Date Title
US358475A US3366749A (en) 1964-04-09 1964-04-09 Audio transducer

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US3366749A true US3366749A (en) 1968-01-30

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AU (1) AU425651B2 (en)
BE (1) BE708438A (en)
CH (1) CH482260A (en)
DE (1) DE1537581B2 (en)
GB (1) GB1201359A (en)
NL (1) NL6717439A (en)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3430007A (en) * 1966-03-16 1969-02-25 Rolen Diversified Investors In Dynamic transducer with wall mounted diaphragm
US3449531A (en) * 1968-01-09 1969-06-10 William J Ashworth Electro-mechanical transducer
US3524027A (en) * 1967-05-04 1970-08-11 Rolen Diversified Investors In Sound transducer with wall mounted diaphragm
US3553392A (en) * 1968-03-07 1971-01-05 Electronics Inc Of Pennsylvani Electrodynamic sound radiator
US3618062A (en) * 1969-04-02 1971-11-02 American District Telegraph Co Vault protection system
US3728497A (en) * 1970-07-06 1973-04-17 A Komatsu Dynamic loudspeaker using wall as diaphragm
US4064376A (en) * 1975-04-08 1977-12-20 Bodysonic Kabushiki Kaisha Sound reproduction system and device
EP0083310A1 (en) * 1981-12-22 1983-07-06 Multiphonie S.A. Electro-acoustic transducer
US4914750A (en) * 1987-07-13 1990-04-03 Avm Hess, Inc. Sound transducer
US4926486A (en) * 1987-07-17 1990-05-15 Barsumian Bruce R Transducer assembly for automatic message system
WO1990014169A1 (en) * 1989-05-16 1990-11-29 Infrawave Technology A.S Electromechanical transducer for low frequency vibrations
US5335284A (en) * 1993-11-23 1994-08-02 Lemons James W Coneless, no-moving-parts speaker
US5546469A (en) * 1994-08-15 1996-08-13 Donahoe; Danny T. Sound transducer
US20050207609A1 (en) * 2004-02-19 2005-09-22 Oser R B Transducer for tactile applications and apparatus incorporating transducers
US20070025575A1 (en) * 2005-02-18 2007-02-01 So Sound Solutions Llc System and method for integrating transducers into body support structures
US20090010468A1 (en) * 2004-02-19 2009-01-08 Richard Barry Oser Actuation of floor systems using mechanical and electro-active polymer transducers
DE102009048866A1 (en) 2009-08-27 2011-03-03 Bösnecker, Robert, Dr. Device for vibration stimulation of diaphragms or diaphragm-type materials showing frequencies in audio range of humans, has electrical change signal partly converted in mechanical motion, where converter possess hole or opening
WO2015030602A1 (en) * 2013-08-30 2015-03-05 Redcord As A vibrator apparatus for use in physical treatment
WO2020245467A1 (en) 2019-06-07 2020-12-10 Syndermix Ag Vibration generator
USD963868S1 (en) 2019-08-09 2022-09-13 Syndermix Ag Medical device

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4635287A (en) * 1983-10-19 1987-01-06 Mutsuo Hirano Audio-frequency electromechanical vibrator
DE102016111872A1 (en) * 2016-06-29 2018-01-04 Arno Heinen Broadband Exciter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341275A (en) * 1940-11-16 1944-02-08 Holland Glen Sound reproducing instrument
US2756281A (en) * 1949-05-03 1956-07-24 Abraham L Pittinger Explosion proof acoustic device
US2862069A (en) * 1956-02-28 1958-11-25 Roanwell Corp Dynamic transducer
US3125647A (en) * 1964-03-17 Frequency-o cycles sec
US3236958A (en) * 1961-04-25 1966-02-22 Electronic Res Associates Inc Loudspeaker system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3125647A (en) * 1964-03-17 Frequency-o cycles sec
US2341275A (en) * 1940-11-16 1944-02-08 Holland Glen Sound reproducing instrument
US2756281A (en) * 1949-05-03 1956-07-24 Abraham L Pittinger Explosion proof acoustic device
US2862069A (en) * 1956-02-28 1958-11-25 Roanwell Corp Dynamic transducer
US3236958A (en) * 1961-04-25 1966-02-22 Electronic Res Associates Inc Loudspeaker system

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3430007A (en) * 1966-03-16 1969-02-25 Rolen Diversified Investors In Dynamic transducer with wall mounted diaphragm
US3524027A (en) * 1967-05-04 1970-08-11 Rolen Diversified Investors In Sound transducer with wall mounted diaphragm
US3449531A (en) * 1968-01-09 1969-06-10 William J Ashworth Electro-mechanical transducer
US3553392A (en) * 1968-03-07 1971-01-05 Electronics Inc Of Pennsylvani Electrodynamic sound radiator
US3618062A (en) * 1969-04-02 1971-11-02 American District Telegraph Co Vault protection system
US3728497A (en) * 1970-07-06 1973-04-17 A Komatsu Dynamic loudspeaker using wall as diaphragm
US4064376A (en) * 1975-04-08 1977-12-20 Bodysonic Kabushiki Kaisha Sound reproduction system and device
EP0083310A1 (en) * 1981-12-22 1983-07-06 Multiphonie S.A. Electro-acoustic transducer
US4914750A (en) * 1987-07-13 1990-04-03 Avm Hess, Inc. Sound transducer
US4926486A (en) * 1987-07-17 1990-05-15 Barsumian Bruce R Transducer assembly for automatic message system
WO1990014169A1 (en) * 1989-05-16 1990-11-29 Infrawave Technology A.S Electromechanical transducer for low frequency vibrations
US5335284A (en) * 1993-11-23 1994-08-02 Lemons James W Coneless, no-moving-parts speaker
US5546469A (en) * 1994-08-15 1996-08-13 Donahoe; Danny T. Sound transducer
US8077884B2 (en) 2004-02-19 2011-12-13 So Sound Solutions, Llc Actuation of floor systems using mechanical and electro-active polymer transducers
US7418108B2 (en) 2004-02-19 2008-08-26 So Sound Solutions, Llc Transducer for tactile applications and apparatus incorporating transducers
US20090010468A1 (en) * 2004-02-19 2009-01-08 Richard Barry Oser Actuation of floor systems using mechanical and electro-active polymer transducers
US20050207609A1 (en) * 2004-02-19 2005-09-22 Oser R B Transducer for tactile applications and apparatus incorporating transducers
US8761417B2 (en) 2004-02-19 2014-06-24 So Sound Solutions, Llc Tactile stimulation using musical tonal frequencies
US20070025575A1 (en) * 2005-02-18 2007-02-01 So Sound Solutions Llc System and method for integrating transducers into body support structures
US7981064B2 (en) 2005-02-18 2011-07-19 So Sound Solutions, Llc System and method for integrating transducers into body support structures
US8617089B2 (en) 2005-02-18 2013-12-31 So Sound Solutions Llc Inducing tactile stimulation of musical tonal frequencies
DE102009048866A1 (en) 2009-08-27 2011-03-03 Bösnecker, Robert, Dr. Device for vibration stimulation of diaphragms or diaphragm-type materials showing frequencies in audio range of humans, has electrical change signal partly converted in mechanical motion, where converter possess hole or opening
WO2015030602A1 (en) * 2013-08-30 2015-03-05 Redcord As A vibrator apparatus for use in physical treatment
US10363196B2 (en) 2013-08-30 2019-07-30 Redcord As Vibrator apparatus for use in physical treatment
WO2020245467A1 (en) 2019-06-07 2020-12-10 Syndermix Ag Vibration generator
USD963868S1 (en) 2019-08-09 2022-09-13 Syndermix Ag Medical device

Also Published As

Publication number Publication date
DE1537581B2 (en) 1975-05-22
DE1537581A1 (en) 1970-01-08
AU425651B2 (en) 1972-06-30
AU3070667A (en) 1969-06-12
NL6717439A (en) 1969-06-24
GB1201359A (en) 1970-08-05
CH482260A (en) 1969-11-30
BE708438A (en) 1968-05-02

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