WO2009122459A1 - 電磁変換器 - Google Patents
電磁変換器 Download PDFInfo
- Publication number
- WO2009122459A1 WO2009122459A1 PCT/JP2008/000825 JP2008000825W WO2009122459A1 WO 2009122459 A1 WO2009122459 A1 WO 2009122459A1 JP 2008000825 W JP2008000825 W JP 2008000825W WO 2009122459 A1 WO2009122459 A1 WO 2009122459A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- magnetic pole
- magnetic
- vibration film
- magnets
- yoke
- Prior art date
Links
- 238000006243 chemical reaction Methods 0.000 title abstract 2
- 239000012528 membrane Substances 0.000 claims description 9
- 230000005855 radiation Effects 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 abstract 4
- 230000004907 flux Effects 0.000 description 5
- 230000005236 sound signal Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
Images
Classifications
-
- 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
- H04R9/025—Magnetic circuit
-
- 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
-
- 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
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/046—Construction
- H04R9/047—Construction in which the windings of the moving coil lay in the same plane
Definitions
- the present invention relates to an electromagnetic transducer that is provided with a coil pattern on the surface of a diaphragm and reproduces sound from an audio signal.
- the electromagnetic transducer described in Patent Document 1 includes a permanent magnet plate, a vibration film disposed at a position facing the permanent magnet plate, and a buffer member interposed between the permanent magnet plate and the vibration film. .
- the permanent magnet plate different strip-shaped magnetic poles are alternately formed at regular intervals.
- a coil made of a meandering conductor pattern is formed at a position facing the so-called neutral zone of magnetization, which is a gap portion between different magnetic poles of the permanent magnet plate.
- the coil and the multipolar magnetization pattern of the permanent magnet plate are electromagnetically coupled, and audio vibration is generated in the diaphragm according to Fleming's law.
- the permanent magnet plate, the diaphragm and the buffer member are covered with a metal frame and attached to the speaker housing, and sound waves generated by the vibration are radiated through the radiation holes provided in the permanent magnet plate and the metal frame for audio reproduction. Done.
- the conventional electromagnetic transducer Since the conventional electromagnetic transducer is configured as described above, it is necessary to dispose the permanent magnet plate at a position facing the vibration membrane so that the vibration membrane is sandwiched from both directions, and the thickness of the permanent magnet plate is increased. Then, there existed a subject that it led to the enlargement of a magnetic circuit. Therefore, in order to obtain the magnetic flux density necessary for driving the diaphragm without increasing the thickness of the permanent magnet plate, it is necessary to use a magnet with a high maximum energy product (BHmax) such as a neodymium iron boron magnet. There was a problem that the circuit was expensive.
- BHmax high maximum energy product
- the present invention has been made to solve the above-described problems, and even when a magnetic circuit is configured using a magnet having a low maximum energy product, the vibration film is driven without causing an increase in the size of the magnetic circuit.
- An object of the present invention is to provide an electromagnetic transducer capable of obtaining a magnetic flux density required for the above.
- the electromagnetic transducer according to the present invention is disposed between at least two magnets having at least two magnets having opposite poles on opposite surfaces, a plurality of magnetic pole yokes magnetized by the magnets to form a magnetic pole, And a vibrating film that is electromagnetically coupled to the magnetic pole yoke to vibrate in a predetermined direction by energizing the coil pattern formed on the magnetic pole yoke, and the magnetic pole yoke includes an abutting portion magnetized by abutting on the magnet
- a magnetic pole portion that forms the magnetic pole in a strip shape, and the magnetic pole portions of the magnetic pole yokes are disposed on the upper side and the lower side of the vibrating membrane, respectively, and the magnetic pole portions are arranged in the left-right direction of the vibrating membrane.
- the different magnetic pole portions are arranged at intervals so as to be alternately positioned, and magnetic pole surfaces are formed on the upper side and the lower side of the vibration film.
- At least two magnets having both poles on opposite surfaces, a plurality of magnetic pole yokes magnetized by the magnets to form magnetic poles, and disposed between the at least two magnets and formed on the surface.
- a vibration film that is electromagnetically coupled to the magnetic pole yoke and vibrates in a predetermined direction by energizing the coil pattern, wherein the magnetic pole yoke is in contact with the magnet and magnetized.
- FIG. 2 is a sectional view taken along line AA in FIG. 1.
- FIG. 2 is a sectional view taken along line BB in FIG.
- FIG. 1 is an exploded perspective view showing a configuration of an electromagnetic transducer according to Embodiment 1 of the present invention.
- FIG. 2 is an upper view showing the configuration of the electromagnetic transducer according to Embodiment 1 of the present invention.
- 3 is a cross-sectional view taken along line AA in FIG. 1
- FIG. 4 is a cross-sectional view taken along line BB in FIG.
- the electromagnetic transducer 10 includes two magnets 11, 12, a first magnetic pole yoke 13, a second magnetic pole yoke 14, a third magnetic pole yoke 15, a fourth magnetic pole yoke 16, a vibration film 17, a gasket (fixing member) 18, and sound radiation. It consists of holes 19.
- the magnet 11 and the magnet 12 are disposed at both ends on the short side of the rectangular diaphragm 17 and have magnetic poles in the vertical direction with respect to the surface on which the diaphragm 17 is formed.
- the upper surface of the magnet 11 and the magnet 12 is composed of an N pole and the lower surface is composed of an S pole.
- the first magnetic pole yoke 13 and the second magnetic pole yoke 14 are disposed so as to sandwich the magnet 11 and the magnet 12 from the upper side, and the third magnetic pole yoke 15 and the fourth magnetic pole yoke 16 are disposed so as to sandwich the magnet 11 and the magnet 12 from the lower side.
- Each magnetic pole yoke 13-16 is made of a material having high magnetic permeability such as iron.
- the first magnetic pole yoke 13 includes an abutting portion 13a that abuts on the N pole on the upper surface of the magnet 12, three magnetic pole portions 13b that extend in a strip shape from the abutting portion 13a at a predetermined interval, and a magnetic pole portion 13b. It is comprised by the surrounding part 13c extended in a substantially L shape downward from two outer sides, respectively.
- the three magnetic pole portions 13b are positioned above the vibration film 17 when the electromagnetic transducer 10 is assembled.
- the second magnetic pole yoke 14 includes a contact portion 14a that contacts the N pole on the upper surface of the magnet 11, and a magnetic pole portion 14b that extends from the contact portion 14a in a strip shape.
- the magnetic pole portion 14 b is positioned below the vibration film 17 so as to intersect with a magnetic pole portion of a fourth magnetic pole yoke 16 described later when the electromagnetic transducer 10 is assembled. Further, a concave portion 14c into which the central portion of the magnetic pole portion 13b can be fitted is formed on the upper surface of the contact portion 14a.
- the third magnetic pole yoke 15 is composed of a contact portion 15a that contacts the S pole on the lower surface of the magnet 12, and two magnetic pole portions 15b that extend from the contact portion 15a at a certain interval in a band shape.
- the two magnetic pole portions 15b are positioned below the vibration film 17 when the electromagnetic transducer 10 is assembled.
- the fourth magnetic pole yoke 16 includes a contact portion 16a that contacts the S pole on the lower surface of the magnet 11, and a magnetic pole portion 16b that extends in a strip shape from the contact portion 16a at a predetermined interval.
- the magnetic pole portion 16 b is formed to be bent so as to cross the magnetic pole portion 14 b of the second magnetic pole yoke 14 and to be positioned below the vibration film 17 when the electromagnetic transducer 10 is assembled.
- the first magnetic pole yoke 13 and the second magnetic pole yoke 14 that contact the N pole of the magnet 11 and the magnet 12 are magnetized to the N pole, and the third magnetic pole yoke 15 and the fourth magnetic pole yoke that contact the S pole of the magnet 11 and the magnet 12. 16 is magnetized to the south pole.
- the magnetic pole portion 14b of the second magnetic pole yoke 14 and the magnetic pole portion 16b of the fourth magnetic pole yoke 16 are arranged so as to intersect vertically, when each magnetic pole yoke 13-16 is assembled, FIG. 2 and FIG. As shown in FIG. 6, the N pole magnetic pole portion 13b and the S pole magnetic pole portion 16b are alternately arranged on the upper side of the vibration film 17 to form a magnetic pole surface.
- the magnetic pole portions 15b of the poles are alternately arranged to form a magnetic pole surface.
- the vibration film 17 is formed of a thin and flexible rectangular resin film 17a, and a meandering coil pattern 17b, which is a meandering conductor pattern, is formed on both surfaces.
- the vibration film 17 is disposed opposite to the magnetic pole surface formed by each magnetic pole yoke 13-16.
- the meandering coil pattern 17b is located on the neutral zone nz in the gap formed between the magnetic pole portions 13b-16b of the N pole and the S pole when the magnetic pole yokes 13-16 are assembled. is doing.
- the gasket 18 is made of a resin or a non-magnetic metal and sandwiches the outer peripheral portion of the vibration film 17.
- the vibration film 17 is positioned by further sandwiching the gasket 18 between the magnetic pole yokes 13-16.
- Each magnetic pole yoke 13-16 that sandwiches the vibration film 17 and the gasket 18 also has a frame function.
- the sound radiation hole 19 is a gap portion formed between the magnetic pole portions 13b and 16b and a gap portion formed between the magnetic pole portions 14b and 15b when the magnetic pole yokes 13-16 are assembled.
- the linear portion extending in the longitudinal direction of the meandering coil pattern 17b of the vibration film 17 is positioned at the portion where the sound radiation hole 19 is formed.
- the straight line portion refers to a long straight line portion arranged in parallel with each other at a predetermined interval in the meandering coil pattern 17b.
- the operation of the electromagnetic transducer 10 will be described.
- a current as an audio signal flows through the meandering coil pattern 17b of the vibration film 17, the meandering coil pattern 17b and the magnetic poles of the first magnetic pole yoke 13, the second magnetic pole yoke 14, the third magnetic pole yoke 15, and the fourth magnetic pole yoke 16 are connected.
- the vibrating membrane 17 vibrates in the thickness direction according to Fleming's law.
- the sound wave generated by this vibration is emitted from the sound emission hole 19 and audio reproduction is performed.
- the two magnets are arranged at the outer end portions of the vibration membrane, it is possible to change the size and thickness of the magnet, such as a ferrite magnet. Even if an inexpensive magnet having a relatively low maximum energy product is used, the magnetic flux density necessary for driving the diaphragm can be obtained.
- the magnetic pole portions of the magnetic pole yokes are alternately arranged so that the gap between the magnetic pole portions is used as the sound radiating hole. Without providing them, each magnetic pole yoke can be shared as a frame, and the low cost of the electromagnetic transducer can be realized.
- each magnetic pole yoke is shared as a frame for fixing the diaphragm.
- the configuration using the two magnets 11 and 12 has been described.
- the number of magnets is not limited to this as long as the magnetic pole yoke is magnetized.
- the magnetic pole yoke 13 has three magnetic pole portions 13b
- the magnetic pole yoke 14 has one magnetic pole portion 14b
- the magnetic pole yoke 15 and the magnetic pole yoke 16 have two magnetic pole portions 15b and 16b, respectively.
- the number of the magnetic pole portions is not limited to the above-mentioned number, and can be appropriately changed as long as a magnetic pole surface in which N pole magnetic pole portions and S pole magnetic pole portions are alternately arranged can be formed.
- the magnetic pole portion 14b of the magnetic pole yoke 14 and the magnetic pole portion 16b of the magnetic pole yoke 16 intersect each other.
- the magnetic pole portion in which the N-pole magnetic pole portion and the S-pole magnetic pole portion are alternately arranged is not limited to the above as long as the surface can be formed.
- the electromagnetic transducer according to the present invention makes it possible to obtain a necessary magnetic flux density using a magnet having a relatively low maximum energy product (BHmax), such as a ferrite magnet, so that an audio signal is reproduced. Suitable for sound equipment.
- BHmax maximum energy product
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
Description
実施の形態1.
図1から図4に基づきこの発明の実施の形態1に係る電磁変換器の構成について説明する。図1は、この発明の実施の形態1に係る電磁変換器の構成を示す分解斜視図である。図2は、この発明の実施の形態1に係る電磁変換器の構成を示す上方図である。さらに、図3は図1におけるA-A線断面図、図4は図1におけるB-B線断面図である。
電磁変換器10は、2つの磁石11,12、第1磁極ヨーク13、第2磁極ヨーク14、第3磁極ヨーク15、第4磁極ヨーク16、振動膜17、ガスケット(固定部材)18、音放射孔19で構成されている。
振動膜17の蛇行コイルパターン17bにオーディオ信号である電流が流れると、蛇行コイルパターン17bと第1磁極ヨーク13、第2磁極ヨーク14、第3磁極ヨーク15、第4磁極ヨーク16の磁極とが電磁的に結合し、フレミングの法則に従って振動膜17が厚み方向に振動する。この振動によって発生した音波が、音放射孔19から放射されてオーディオ再生が行われる。
Claims (4)
- 対向する面に両極を有する少なくとも二つの磁石と、
前記磁石により磁化されて磁極を形成する複数の磁極ヨークと、
前記少なくとも二つの磁石の間に配置し、表面に形成されたコイルパターンを通電することにより前記磁極ヨークと電磁的に結合して所定方向に振動する振動膜とを備え、
前記磁極ヨークは、前記磁石と当接して磁化される当接部と、前記磁極を帯状に形成する磁極部とを備え、
前記複数の磁極ヨークの複数の磁極部を前記振動膜の上側及び下側にそれぞれ配設すると共に、前記振動膜の左右方向に磁極の異なる前記磁極部が交互に位置するように間隔を開けて配設し、前記振動膜の上側及び下側に磁極面を形成する電磁変換器。 - 振動膜の左右方向の磁極部間に生じる間隙を音放射孔とすることを特徴とする請求項1記載の電磁変換器。
- 複数の磁極ヨークは、振動膜を覆い固定することを特徴とする請求項1記載の電磁変換器。
- 振動膜の外周部を狭持する固定部材を設け、
複数の磁極ヨークは、前記振動膜及び前記固定部材を狭持して覆うことを特徴とする請求項1記載の電磁変換器。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/812,529 US8345897B2 (en) | 2008-03-31 | 2008-03-31 | Electromagnetic conversion unit |
PCT/JP2008/000825 WO2009122459A1 (ja) | 2008-03-31 | 2008-03-31 | 電磁変換器 |
JP2010505039A JP4902784B2 (ja) | 2008-03-31 | 2008-03-31 | 電磁変換器 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2008/000825 WO2009122459A1 (ja) | 2008-03-31 | 2008-03-31 | 電磁変換器 |
Publications (1)
Publication Number | Publication Date |
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WO2009122459A1 true WO2009122459A1 (ja) | 2009-10-08 |
Family
ID=41134881
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2008/000825 WO2009122459A1 (ja) | 2008-03-31 | 2008-03-31 | 電磁変換器 |
Country Status (3)
Country | Link |
---|---|
US (1) | US8345897B2 (ja) |
JP (1) | JP4902784B2 (ja) |
WO (1) | WO2009122459A1 (ja) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4902784B2 (ja) * | 2008-03-31 | 2012-03-21 | 三菱電機エンジニアリング株式会社 | 電磁変換器 |
CN104094368A (zh) * | 2012-01-30 | 2014-10-08 | 三菱电机株式会社 | 磁路 |
DE102013221752A1 (de) * | 2013-10-25 | 2015-04-30 | Kaetel Systems Gmbh | Ohrhörer und verfahren zum herstellen eines ohrhörers |
WO2016020835A1 (en) * | 2014-08-04 | 2016-02-11 | Katz David Micah | Electromechanical transducer with non-circular voice coil |
US20160212544A1 (en) * | 2014-10-30 | 2016-07-21 | Sennheiser Electronic Gmbh & Co. Kg | Planar dynamic sound transducer |
US20160192079A1 (en) * | 2014-12-31 | 2016-06-30 | Knowles Ipc (M) Sdn. Bhd. | Rotary flux acoustic transducer |
Citations (1)
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JPS52113717A (en) * | 1976-03-19 | 1977-09-24 | Toshiba Corp | Electro-acoustic transducer |
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2008
- 2008-03-31 JP JP2010505039A patent/JP4902784B2/ja not_active Expired - Fee Related
- 2008-03-31 WO PCT/JP2008/000825 patent/WO2009122459A1/ja active Application Filing
- 2008-03-31 US US12/812,529 patent/US8345897B2/en active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS52113717A (en) * | 1976-03-19 | 1977-09-24 | Toshiba Corp | Electro-acoustic transducer |
Also Published As
Publication number | Publication date |
---|---|
JP4902784B2 (ja) | 2012-03-21 |
JPWO2009122459A1 (ja) | 2011-07-28 |
US20100283567A1 (en) | 2010-11-11 |
US8345897B2 (en) | 2013-01-01 |
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