WO2020088859A1 - A sound device with magnetized diaphragm - Google Patents

A sound device with magnetized diaphragm Download PDF

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Publication number
WO2020088859A1
WO2020088859A1 PCT/EP2019/076351 EP2019076351W WO2020088859A1 WO 2020088859 A1 WO2020088859 A1 WO 2020088859A1 EP 2019076351 W EP2019076351 W EP 2019076351W WO 2020088859 A1 WO2020088859 A1 WO 2020088859A1
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WO
WIPO (PCT)
Prior art keywords
diaphragm
sound device
coil
sound
present
Prior art date
Application number
PCT/EP2019/076351
Other languages
French (fr)
Inventor
Ibrahim DEMIREL
Ridvan YUKSEL
Mustafa KUCUKKURU
Caglar Henden
Fatih CETINDAG
Original Assignee
Arcelik Anonim Sirketi
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 Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Publication of WO2020088859A1 publication Critical patent/WO2020088859A1/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04—Plane diaphragms

Definitions

  • the present invention relates to a sound device comprising a magnetized diaphragm.
  • a diaphragm In the field of acoustics, a diaphragm is a transducer for converting mechanical vibrations to sounds or sounds to mechanical vibrations. It is generally composed of a thin membrane or sheet of various materials, suspended at its edges. The varying air pressure of sound waves imparts mechanical vibrations to the diaphragm which can then be converted to some other type of signal. Examples of this type of diaphragm are found in microphones and the human eardrum. Conversely a diaphragm vibrated by a source of energy beats against the air, creating sound waves. Examples of this type of diaphragm are loudspeaker cones and earphone diaphragms.
  • a diaphragm is the thin, semi-rigid membrane attached to the voice coil, and said voice coil moves in a magnetic gap, vibrates the diaphragm and produces sound.
  • the diaphragm can also be called a cone; however, not all speaker diaphragms are cone-shaped. Diaphragms are also found in headphones.
  • Quality midrange and bass drivers are usually produced from paper, paper composites and laminates, plastic materials such as polypropylene, or mineral/fiber filled polypropylene. Such materials have very high strength/weight ratios and tend to be relatively immune from flexing during large excursions. This allows the driver to react quickly during transitions in music (fast changing transient impulses) and minimizes acoustical output distortion.
  • diaphragms can outperform more expensive ones.
  • Other materials used for diaphragms include polypropylene (PP), polyetheretherketone (PEEK) polycarbonate (PC), Mylar (PET), silk, glassfibre, carbon fibre, titanium, aluminium, aluminium-magnesium alloy, nickel, and beryllium.
  • Paper-based cones account for approximately 85% of the cones sold worldwide.
  • the ability of paper (cellulose) to be easily modified by chemical or mechanical means provides a practical advantage not found in other common cone materials.
  • Microphones can be thought of as speakers in reverse.
  • the sound waves strike the thin diaphragm and vibrates the diaphragm.
  • Microphone diaphragms unlike speaker diaphragms, tend to be thin and flexible, since they need to absorb as much sound as possible.
  • the diaphragm In a condenser microphone, the diaphragm is placed in front of a plate and is charged.
  • the diaphragm is glued to a magnetic coil, similar to the one in a dynamic loudspeaker.
  • a dynamic speaker can be used as a rudimentary microphone, and vice versa.
  • the diaphragm in a microphone works similarly to the human eardrum.
  • a state of the art patent publication can be referred to as US2009161905.
  • Said patent publication discloses a loudspeaker having a simple structure without any complex production process.
  • Said loudspeaker comprises an internal magnet-type magnetic circuit having a magnet, a plate, a yoke, a voice coil and a diaphragm supporting the voice coil.
  • Said patent publication comprises a dual-cone loudspeaker having a primary speaker cone and an axially displaced secondary speaker cone mounted to the back of a magnet structure.
  • a rigid link causes both cones to move in unison.
  • the rigid link includes an open support structure with equiangularly extending spokes that form a central hub.
  • a ring circumscribes the spokes and attaches to the first speaker cone.
  • a rigid element connects to the spokes and the secondary speaker cone so the primary and secondary speaker cones move in unison and improve the bass response for the loudspeaker.
  • the rigid coupling device is also adapted to support a high frequency radiator to extend the overall loudspeaker frequency response into higher frequencies.
  • the system of the present invention relates to the elimination of the magnet system which is critical in terms of weight, size and cost in sound processing systems.
  • the aim of the present invention is the elimination of the magnet structure in microphone or loudspeaker systems.
  • Figure 1 - is the top view of the wound coil in the sound device of the present invention.
  • Figure 2 - is the sideways view of the diaphragm, coil and mechanical retainers in the sound device of the present invention.
  • Figure 3 - is the top view of the diaphragm in the sound device of the present invention.
  • Figure 4 - is the flow chart showing the operation process of the sound device of the present invention.
  • the present invention relates to the magnetization of a diaphragm (4) in sound devices in order to create a fixed magnetic field and a variable magnetic field and to form a fixed magnetic force.
  • Said diaphragm (4) can be produced from paper or fabric.
  • a planar coil (3) which is wound in the horizontal plane and which has a first coil pole (1) and a second coil pole (2) is used.
  • Variable voltage values applied to said first coil pole (1) and second coil pole (2) provide the generation of electromagnetic flux by way of induction.
  • At least one mechanical retainer (5) is used in order to protect the resulting structure and to provide the interaction of the variable magnetic field and the magnetized structure.
  • Said diaphragm (4) is supported by the mechanical retainer at a certain position in the magnetic flux generated by said coil (3).
  • said coil (3) generates an electromagnetic force by way of induction according to the sound signal.
  • the electromagnetic force generates a drive force which causes said diaphragm (4) to vibrate in the vertical axis.
  • the diaphragm (4) magnetized depending on the variable magnetic field on said coil (3) moves the air.
  • the sensor receives the moving air as sound.
  • Figure 4 shows the flow chart of the process for magnetizing said diaphragm (4), generating sound, recording sound or detecting sound.
  • Said sound device can be used by itself or on an electronic device such as television, computer, telephone, radio set, record player, recording device, etc.
  • a sound device configuration comprising a coil (3) system having a first coil pole (1) and a second coil pole (2).
  • a magnetized diaphragm (4) is provided, which is moved by the electromagnetic flux generated by the induction of said coil (3) system.
  • the sound device comprises a diaphragm (4) which moves in the vertical axis.
  • At least one mechanical retainer (5) is provided in order to protect the resulting structure and to provide the interaction of the variable magnetic field generated by said coil (3) and said magnetized diaphragm (4).
  • said diaphragm (4) is produced from paper.
  • said diaphragm (4) is produced from fabric.
  • said coil (3) has a planar wound structure.
  • said sound device is a sound source.
  • said sound device is a loudspeaker.
  • said sound device is a microphone.
  • a magnetized diaphragm is realized, which can be moved by using the magnetic field changed by the coil in the sound devices.

Abstract

The present invention relates to a sound device comprising a magnetized diaphragm (4). The present invention in particular relates to a magnetized diaphragm (4) which is moved by the electromagnetic flux generated by the induction of said coil (3) system in a sound device comprising a coil (3) system having a first coil pole (1) and a second coil pole (2).

Description

A SOUND DEVICE WITH MAGNETIZED DIAPHRAGM
Technical Field of the Present Invention
The present invention relates to a sound device comprising a magnetized diaphragm.
Prior Art
In the field of acoustics, a diaphragm is a transducer for converting mechanical vibrations to sounds or sounds to mechanical vibrations. It is generally composed of a thin membrane or sheet of various materials, suspended at its edges. The varying air pressure of sound waves imparts mechanical vibrations to the diaphragm which can then be converted to some other type of signal. Examples of this type of diaphragm are found in microphones and the human eardrum. Conversely a diaphragm vibrated by a source of energy beats against the air, creating sound waves. Examples of this type of diaphragm are loudspeaker cones and earphone diaphragms.
In dynamic loudspeakers, a diaphragm is the thin, semi-rigid membrane attached to the voice coil, and said voice coil moves in a magnetic gap, vibrates the diaphragm and produces sound. The diaphragm can also be called a cone; however, not all speaker diaphragms are cone-shaped. Diaphragms are also found in headphones.
Quality midrange and bass drivers are usually produced from paper, paper composites and laminates, plastic materials such as polypropylene, or mineral/fiber filled polypropylene. Such materials have very high strength/weight ratios and tend to be relatively immune from flexing during large excursions. This allows the driver to react quickly during transitions in music (fast changing transient impulses) and minimizes acoustical output distortion.
If properly designed in terms of mass, stiffness, and damping, midrange diaphragms can outperform more expensive ones. Other materials used for diaphragms include polypropylene (PP), polyetheretherketone (PEEK) polycarbonate (PC), Mylar (PET), silk, glassfibre, carbon fibre, titanium, aluminium, aluminium-magnesium alloy, nickel, and beryllium.
Paper-based cones account for approximately 85% of the cones sold worldwide. The ability of paper (cellulose) to be easily modified by chemical or mechanical means provides a practical advantage not found in other common cone materials.
Microphones can be thought of as speakers in reverse. The sound waves strike the thin diaphragm and vibrates the diaphragm. Microphone diaphragms, unlike speaker diaphragms, tend to be thin and flexible, since they need to absorb as much sound as possible. In a condenser microphone, the diaphragm is placed in front of a plate and is charged. In a dynamic microphone, the diaphragm is glued to a magnetic coil, similar to the one in a dynamic loudspeaker. In fact, a dynamic speaker can be used as a rudimentary microphone, and vice versa. The diaphragm in a microphone works similarly to the human eardrum.
A state of the art patent publication can be referred to as US2009161905. Said patent publication discloses a loudspeaker having a simple structure without any complex production process. Said loudspeaker comprises an internal magnet-type magnetic circuit having a magnet, a plate, a yoke, a voice coil and a diaphragm supporting the voice coil.
Another state of the art patent publication can be referred to as US6343128. Said patent publication comprises a dual-cone loudspeaker having a primary speaker cone and an axially displaced secondary speaker cone mounted to the back of a magnet structure. A rigid link causes both cones to move in unison. The rigid link includes an open support structure with equiangularly extending spokes that form a central hub. A ring circumscribes the spokes and attaches to the first speaker cone. A rigid element connects to the spokes and the secondary speaker cone so the primary and secondary speaker cones move in unison and improve the bass response for the loudspeaker. The rigid coupling device is also adapted to support a high frequency radiator to extend the overall loudspeaker frequency response into higher frequencies.
On the other hand, in sound processing systems the elimination of the magnet structure which is very critical in terms of size and cost, and of the structure which is used for returning the diaphragm to the initial position after movement is desired.
In other words, the system of the present invention relates to the elimination of the magnet system which is critical in terms of weight, size and cost in sound processing systems.
Aims of the Present Invention
The aim of the present invention is the elimination of the magnet structure in microphone or loudspeaker systems.
Brief Explanation of Figures
A product realized in order to attain the aim of the present invention is illustrated in the attached figures, which are briefly explained below.
The technical drawings attached to the present description should not be used alone in the interpretation of the scope of protection of the invention without reference to the description. On the other hand, the attached technical drawings should be used to determine the scope of protection described in the claims of the present invention and to interpret and not to delimit it.
The attached figures do not refer to the absolute dimensions of the product unless otherwise specified and the proportions of the opposing sections do not reflect the actual product one to one.
Figure 1 - is the top view of the wound coil in the sound device of the present invention.
Figure 2 - is the sideways view of the diaphragm, coil and mechanical retainers in the sound device of the present invention.
Figure 3 - is the top view of the diaphragm in the sound device of the present invention.
Figure 4 - is the flow chart showing the operation process of the sound device of the present invention.
Detailed Description of the Invention
The elements illustrated in the figures are numbered as follows:
1) First coil pole
2) Second coil pole
3) Coil
4) Diaphragm
5) Mechanical retainer
The present invention relates to the magnetization of a diaphragm (4) in sound devices in order to create a fixed magnetic field and a variable magnetic field and to form a fixed magnetic force. Said diaphragm (4) can be produced from paper or fabric.
As shown in Figure 1, in order to create a variable magnetic field, a planar coil (3) which is wound in the horizontal plane and which has a first coil pole (1) and a second coil pole (2) is used. Variable voltage values applied to said first coil pole (1) and second coil pole (2) provide the generation of electromagnetic flux by way of induction.
As shown in Figure 2, at least one mechanical retainer (5) is used in order to protect the resulting structure and to provide the interaction of the variable magnetic field and the magnetized structure. Said diaphragm (4) is supported by the mechanical retainer at a certain position in the magnetic flux generated by said coil (3). Thus, when a sound signal is applied, said coil (3) generates an electromagnetic force by way of induction according to the sound signal. The electromagnetic force generates a drive force which causes said diaphragm (4) to vibrate in the vertical axis.
As shown in Figure 3, the diaphragm (4) magnetized depending on the variable magnetic field on said coil (3) moves the air. In case the sound device is a loudspeaker, the sensor receives the moving air as sound.
Figure 4 shows the flow chart of the process for magnetizing said diaphragm (4), generating sound, recording sound or detecting sound.
Said sound device can be used by itself or on an electronic device such as television, computer, telephone, radio set, record player, recording device, etc.
In an embodiment of the present invention, a sound device configuration is proposed, comprising a coil (3) system having a first coil pole (1) and a second coil pole (2).
In another embodiment of the present invention, a magnetized diaphragm (4) is provided, which is moved by the electromagnetic flux generated by the induction of said coil (3) system.
In another embodiment of the present invention, the sound device comprises a diaphragm (4) which moves in the vertical axis.
In another embodiment of the present invention, at least one mechanical retainer (5) is provided in order to protect the resulting structure and to provide the interaction of the variable magnetic field generated by said coil (3) and said magnetized diaphragm (4).
In another embodiment of the present invention, said diaphragm (4) is produced from paper.
In another embodiment of the present invention, said diaphragm (4) is produced from fabric.
In another embodiment of the present invention, said coil (3) has a planar wound structure.
In another embodiment of the present invention, said sound device is a sound source.
In another embodiment of the present invention, said sound device is a loudspeaker.
In another embodiment of the present invention, said sound device is a microphone.
Consequently, by means of the present invention, a magnetized diaphragm is realized, which can be moved by using the magnetic field changed by the coil in the sound devices.

Claims (9)

  1. A sound device comprising a coil (3) having a first coil pole (1) and a second coil pole (2),
    characterized by a magnetized diaphragm (4) which is moved by the electromagnetic flux generated by the induction of said coil (3) system.
  2. A sound device as in Claim 1, characterized by a diaphragm (4) which moves in the vertical axis in said sound device.
  3. A sound device as in Claim 1, characterized by at least one mechanical retainer (5) which is provided in order to protect the resulting structure and to provide the interaction of the variable magnetic field generated by said coil (3) and said magnetized diaphragm (4).
  4. A sound device as in Claim 1 or 2, characterized by the diaphragm (4) which is produced from paper.
  5. A sound device as in Claim 1 or 2, characterized by the diaphragm (4) which is produced from fabric.
  6. A sound device as in Claim 1, characterized by said coil (3) which has a planar wound structure.
  7. A sound device as in any one of the above claims, which is a sound source.
  8. A sound device as in any one of the above claims, which is a loudspeaker.
  9. A sound device as in any one of the above claims, which is a microphone.
PCT/EP2019/076351 2018-10-31 2019-09-30 A sound device with magnetized diaphragm WO2020088859A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201816267 2018-10-31
TR2018/16267 2018-10-31

Publications (1)

Publication Number Publication Date
WO2020088859A1 true WO2020088859A1 (en) 2020-05-07

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PCT/EP2019/076351 WO2020088859A1 (en) 2018-10-31 2019-09-30 A sound device with magnetized diaphragm

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6343128B1 (en) 1999-02-17 2002-01-29 C. Ronald Coffin Dual cone loudspeaker
US20090161905A1 (en) 2005-11-15 2009-06-25 Sinsuke Konuma Speaker and magnetic circuit
US20120294474A1 (en) * 2011-05-19 2012-11-22 Zonghan Wu Moving-Magnet Electromagnetic Device with Planar Coil
US20160014518A1 (en) * 2014-07-08 2016-01-14 Shih-Tung Liu Speaker and diaphragm thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6343128B1 (en) 1999-02-17 2002-01-29 C. Ronald Coffin Dual cone loudspeaker
US20090161905A1 (en) 2005-11-15 2009-06-25 Sinsuke Konuma Speaker and magnetic circuit
US20120294474A1 (en) * 2011-05-19 2012-11-22 Zonghan Wu Moving-Magnet Electromagnetic Device with Planar Coil
US20160014518A1 (en) * 2014-07-08 2016-01-14 Shih-Tung Liu Speaker and diaphragm thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
SYLVAIN GALLAND ET AL: "Cellulose nanofibers decorated with magnetic nanoparticles - synthesis, structure and use in magnetized high toughness membranes for a prototype loudspeaker", JOURNAL OF MATERIALS CHEMISTRY C, vol. 1, no. 47, 1 January 2013 (2013-01-01), pages 7963 - 7972, XP055212605, ISSN: 2050-7526, DOI: 10.1039/c3tc31748j *

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