WO2004066671A1 - Circuit magnetique plan en serie, et transducteur sonore pour appareil electrique - Google Patents

Circuit magnetique plan en serie, et transducteur sonore pour appareil electrique Download PDF

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Publication number
WO2004066671A1
WO2004066671A1 PCT/CN2004/000036 CN2004000036W WO2004066671A1 WO 2004066671 A1 WO2004066671 A1 WO 2004066671A1 CN 2004000036 W CN2004000036 W CN 2004000036W WO 2004066671 A1 WO2004066671 A1 WO 2004066671A1
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WO
WIPO (PCT)
Prior art keywords
magnetic
magnet
magnetic field
magnetic circuit
field forming
Prior art date
Application number
PCT/CN2004/000036
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English (en)
Chinese (zh)
Inventor
Xingrong Wang
Original Assignee
Xingrong Wang
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 Xingrong Wang filed Critical Xingrong Wang
Publication of WO2004066671A1 publication Critical patent/WO2004066671A1/fr

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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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details
    • H04R9/025—Magnetic circuit

Definitions

  • the invention relates to the design of a miniature magnetic circuit and an electric-machine-acoustic transducer using the magnetic circuit.
  • the transducer is particularly suitable for miniature and small electronic products. Background technique
  • GPRS Global System for Mobile Communications
  • CDMA Code Division Multiple Access
  • GSM Global System for Mobile communications
  • IP telephone micro-terminal equipment sound dictionary
  • notebook computers handheld computers
  • PDAs handheld computers
  • LCD TVs micro-transmitting and receiving devices
  • novel electronic products such as electronic toys are versatile, miniaturized, and low-energy Consumption is the current research direction and development trend.
  • the electromagnetic transduction device has relatively high energy conversion efficiency, but its electro-acoustic performance has been unable to meet the requirements of novel mobile phones and even telephones. Electromagnetic transducers have been used for more than 100 years. Since the early 1990s, Had to quietly withdraw from its historical stage, and was completely replaced by electric transducers with low energy conversion efficiency but excellent electroacoustic performance and relatively simple manufacturing process technology.
  • electric transducers usually consist of a magnetic circuit, a vibrating body, and accessories.
  • Traditional electric magnetic circuits have two basic structures. One is called an external magnetic circuit. As shown in Figure 1, it usually consists of a T-shaped iron. 2.
  • the ring magnet 4, the ring-shaped magnetically permeable plate 1 and the T-shaped head of the T-shaped iron 2 and the gap 3 of the ring-shaped magnetically permeable plate 1 form a magnetic circuit.
  • the magnetic circuit and the current-carrying wire or coil 7 extending into the gap 3 and the vibrating body 5, the cover plate 6, and the accessory 8 form an electric-mechanical-acoustic transducing device, as shown in FIG.
  • Another conventional electric type magnetic circuit is called an inner magnetic circuit.
  • the gap 12 between the protruding edge of the magnet guide bowl 9, the magnet 10, the pole plate 11, and the magnet guide bowl '9 and the pole plate 11 is usually Form a magnetic circuit.
  • the magnetic circuit and the current-carrying wire or coil 13 extending into the gap 12 and the vibrating body 15, the cover plate 14 and the accessory 17 form an electric-mechanical-acoustic transducing device, as shown in FIG. 4.
  • the magnetic leakage of the outer magnetic circuit is relatively large, its use range is greatly limited; the inner magnetic circuit
  • the magnets are relatively small and have high requirements on the physical properties of the magnets.
  • the design of the magnetic circuit has changed for a long time, the two methods have generally not been able to break through these two methods.
  • the space occupied by the magnets of the two magnetic circuits is relatively low, which is not a problem for a relatively loose space environment.
  • new electronic products have developed rapidly, and are multifunctional, miniaturized, and low energy.
  • it is not only necessary to have excellent electro-acoustic performance of electricity, machines, and sound transducers, but also it is urgent to have high energy conversion efficiency-that is, high sensitivity, low power consumption, and small size.
  • using a high-performance magnet or increasing the size of the magnet can increase the sensitivity of the transducer.
  • the size of the speakers or receivers currently used in this type of mobile phones is approximately ⁇ 10— ⁇ 15 mm in thickness and 2. 8--3. 5 mm in thickness.
  • an acoustic adjustment hole, cavity, damping, anti-magnetic leakage, etc. must be provided on the speaker or receiver. Therefore, no matter whether the external magnetic or internal magnetic structure is used, due to space and structure constraints, the well-designed ordinary electric internal or external magnetic type magnetic circuit still seems to be inadequate, and its energy conversion efficiency still cannot meet the high requirements of miniature mobile phones.
  • the invention provides a planar series magnetic circuit.
  • the magnetic field in the magnetic gap of the magnetic circuit has a strong magnetic field strength and high conversion efficiency.
  • the invention provides an electric-machine-acoustic transducer using the above-mentioned planar series magnetic circuit.
  • the transducer has high energy conversion efficiency, multiple functions, and small size.
  • the planar series magnetic circuit of the present invention includes: A magnetic field plate, a first magnet superposed on the magnetic field plate, and a first pole plate form a first magnetic field forming portion; a magnetic field plate shared with the first magnetic field forming portion, a second magnet stacked on the magnetic field plate, The second pole plate constitutes a second magnetic field forming portion; the second magnetic field forming portion is disposed on the periphery of the first magnetic field forming portion and has a predetermined magnetic gap; the first magnet and the second magnet have opposite polarities.
  • the cross-sectional shape of the second magnet is hollow, and the cross-sectional shape of the second pole plate is matched with the second magnet.
  • the cross-sectional shape of the second magnet is any one of a ring, a square and a polygon.
  • An electric-machine-acoustic transducer using the above-mentioned planar series magnetic circuit includes a magnetically permeable plate with a cover plate, the magnetically permeable plate, a first magnet superposed on the magnetically permeable plate, and a first pole.
  • the plate constitutes a first magnetic field forming portion; the magnetically conductive plate shared with the first magnetic field forming portion, the second magnet superposed on the magnetically conductive plate, and the second pole plate constitute a second magnetic field forming portion; the second magnetic field forming portion is provided at the first A prescribed magnetic gap is provided on the periphery of a magnetic field forming part; the first magnet and the second magnet have opposite polarities; a vibration film is provided on the magnetically permeable plate, and a coil extending into the magnetic gap is provided on the vibration film, and the wire led by the coil Connects to the accessory terminal block.
  • the magnetically conductive plate is arranged in a plane or has a bowl shape.
  • the height of the first electrode plate is on the same level as the height of the second electrode plate.
  • the magnetic circuit formed by the plane series magnetic circuit is shown in FIG. 5 and its working principle is shown in FIG. 6:
  • the magnetic lines of force from the N pole of the first magnet pass through the magnetic gap through the pole plate and reach the second magnet through the second pole plate.
  • the S-pole of the second magnet passes through the magnetically conductive plate, reaches the S-pole of the first magnet, and passes through the magnetic gap through the pole plate.
  • the magnetic field lines of the first magnetic field forming portion and the magnetic field lines of the second magnetic field forming portion are superposed to form a closed magnetic circuit as shown in the figure.
  • the magnetic circuit of the present invention has a smaller magnetic leakage than the ordinary external magnetic magnetic circuit. Because the two magnets of the plane series magnetic circuit have opposite polarities, the N pole of one magnet and the S pole of the other magnet are attracted to each other through the magnetic conductive plate and the pole plate, and together form a closed magnetic circuit, and the magnetic flux is not easy to diverge. small. At the same time, because the first magnet and the second magnet of the present invention have opposite polarities, the magnetic field lines emitted from each other are superimposed on each other, which enhances the strength of the magnetic field in the magnetic gap and lays a foundation for improving the conversion efficiency of the electric-machine-acoustic transducer.
  • the basic working principle of the plane series magnetic circuit electric one machine and one acoustic transducer is: When an alternating current signal is input at both ends of the wiring board, the alternating current signal is led by the lead wire and flows in the coil, and the coil will be subjected to the force of the magnetic field. As a result, the vibration plate is driven to generate vibration and sound. Conversely, when the vibration plate is excited by vibration or sound, the coil connected to it will move in the magnetic field, and the coil cuts the magnetic field The induced electromotive force is generated and input to both ends of the wiring board, so that the mutual conversion between machine, electricity, sound or machine and electricity is completed.
  • the magnetic field in the magnetic gap of the present invention is a superposition of magnetic lines of force from the first magnet and the second magnet, its magnetic field strength is greatly enhanced. Under the same conditions, the driving force or sound generated will be greater, or the induced electromotive force will be higher. That is, the conversion efficiency of the transducer of the present invention is higher than that of the conventional transducer.
  • the magnetic circuit of the present invention is a combination of an internal magnetic type and an external magnetic type magnetic circuit, which makes full use of space and increases the duty cycle of the magnet, thereby greatly improving the efficiency of the magnetic circuit, thereby improving the electrical and mechanical applications of the planar series magnetic circuit.
  • the conversion efficiency of the acoustic transducer is improved, that is, the sensitivity is improved.
  • the magnetic circuit of the present invention has a compact design, a small volume, and a high magnetic field strength in a magnetic gap.
  • the electric-mechanical-acoustic-transduction device produced by using the planar series magnetic circuit of the present invention has a sound generating efficiency that is 3-6dB higher than that of the existing miniature electric-mechanical-acoustic transducer that has a substantially equivalent shape, and requires less energy consumption 50% to 70%.
  • the electric-machine-acoustic transducing device manufactured by using the planar series magnetic circuit of the present invention can save space or reduce its volume.
  • the electrical-mechanical-acoustic transducing device produced by using the planar series magnetic circuit of the present invention has greater flexibility in the structural design, such as the choice of the size of the coil and the location of the installation diaphragm or plate, which is beneficial to Design the frequency characteristics of the transducer, broaden the frequency band, and improve performance.
  • the planar series magnetic circuit of the present invention can reduce the requirements on the physical properties of the magnet, such as magnetic energy product (BH) and coercive force (He).
  • BH magnetic energy product
  • He coercive force
  • the working gap can be increased, which is conducive to improving the product qualification rate and increasing the withstand power.
  • the magnetically permeable pole plate can be omitted, saving material and reducing height.
  • Figure 1 is a schematic diagram of a conventional external magnetic magnetic circuit
  • Figure 2 is a schematic diagram of the basic structure of an electric-machine-to-acoustic converter using a conventional external magnetic magnetic circuit
  • Figure 3 is a schematic diagram of a conventional internal magnetic magnetic circuit
  • FIG. 4 is a schematic diagram of a basic structure of an electric-machine-acoustic converter using a conventional internal magnetic magnetic circuit
  • FIG. 5 is a schematic diagram of a planar series magnetic circuit of the present invention
  • 6 is a schematic diagram of a planar series magnetic circuit of the present invention
  • FIG. 7 is a schematic structural cross-sectional view of an electric-machine-acoustic transducer according to the present invention.
  • the planar series magnetic circuit of the present invention comprises a magnetic field plate 18, a first magnet 32 superposed on the magnetic field plate 18, and a first pole plate 31 to form a first magnetic field forming portion 30; and a first magnetic field forming portion
  • the magnetically conductive plate 18 shared by 30, the second magnet 21 and the second pole plate 22 stacked on the magnetically conductive plate 18 constitute the second magnetic field forming portion 20; the second magnetic field forming portion 20 is provided on the periphery of the first magnetic field forming portion 30 A prescribed magnetic gap 23 is provided; the first magnet 32 and the second magnet 21 have opposite polarities.
  • the cross-sectional shape of the second magnet 21 is a hollow shape, such as a ring, a square, a polygon, and the like.
  • the cross-sectional shape of the second pole plate 22 is matched with the second magnet 21 and has the same size and is stacked on the first magnet 21.
  • an electric-machine-acoustic transducer using the above-mentioned planar series magnetic circuit includes a magnetically permeable plate 18 with a cover plate 26 thereon, and the magnetically permeable plate 18 and the magnetically permeable plate 18 are stacked on top of each other.
  • the first magnet 32 and the first pole plate 31 are arranged to form the first magnetic field forming section 30; the magnetically permeable plate 1.8 shared with the first magnetic field forming section 30, the second magnet 21 superimposed on the magnetically permeable plate 18, and the second pole
  • the plate 22 constitutes a second magnetic field forming portion 20; the second magnetic field forming portion 20 is provided on the periphery of the first magnetic field forming portion 30 and is provided with a prescribed magnetic gap 23; the first magnet 32 is opposite in polarity to the second magnet 21;
  • the plate 18 is provided with a vibrating film 25.
  • the vibrating film 25 is provided with a coil 24 protruding into the magnetic gap 23.
  • the lead wires from the coil 24 are connected to the wiring board 28 of the accessory 27.
  • the electric-mechanical-acoustic transducer can be used to make various electric, mechanical or mechanical, electric conversion devices, electric, acoustic or acoustic, electric conversion devices such as vibrators, tools, and the like.
  • the electric one-machine-one sound transducer can be used to make various electric, mechanical, and acoustic conversion devices, transmitters, receivers, speakers, headphones, microphones, buzzers, and the like.
  • the magnetically permeable plate 18 can be designed in various shapes, such as flat, bowl-shaped, etc. according to actual needs. When the magnetically permeable plate 18 is in the shape of a bowl, the anti-interference resistance of the conversion device can be enhanced.
  • the height of the first electrode plate 31 and the second electrode plate 22 can be designed according to actual needs. When the height of the first electrode plate 31 and the height of the second electrode plate 22 are on the same level, the conversion sensitivity of the conversion device is the highest.
  • the planar series magnetic circuit and the electric-mechanical-acoustic transducer according to the present invention are used to make a speaker and tested.
  • the test data are as follows: (1) Magnetic circuit of ⁇ 15mm speaker with 3.5mm thickness

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

L'invention concerne un circuit magnétique plan en série, et un transducteur sonore pour appareil électrique utilisant le circuit magnétique. Le circuit magnétique plan en série comprend: une première section de formation de champ magnétique constituée d'une carte magnétique, d'un premier aimant superposé à la carte magnétique et d'une première pièce polaire; une seconde section de formation de champ magnétique constituée d'une carte magnétique identique à celle de la première section de formation de champ magnétique, d'un second aimant superposé à la carte magnétique et d'une seconde pièce polaire. La seconde section de formation de champ magnétique constituée d'une carte magnétique est disposée autour de la première section de formation de champ magnétique et présente un écartement magnétique défini. Le premier aimant et le second aimant présentent des polarités contraires. Le circuit magnétique, les enroulements qui s'insèrent dans l'écartement, le diaphragme, le couvercle et la fixation composent le transducteur sonore pour appareil électrique. La ligne de force magnétique de la première section de formation de champ magnétique et de la seconde section de formation de champ magnétique se superposent; l'intensité du champ magnétique dans l'écartement magnétique est forte; et l'efficacité du transducteur est élevée. Le transducteur sonore pour appareil électrique utilisant le circuit magnétique de l'invention (haut-parleurs, écouteurs de téléphone, etc.) est très efficace, présente plus de fonctions et un encombrement réduit, et s'adapte à des produits électroniques de petite taille ou miniatures.
PCT/CN2004/000036 2003-01-20 2004-01-13 Circuit magnetique plan en serie, et transducteur sonore pour appareil electrique WO2004066671A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 03115016 CN1253056C (zh) 2003-01-20 2003-01-20 平面串联磁路和采用该磁路的电－机－声换能器
CN03115016.0 2003-01-20

Publications (1)

Publication Number Publication Date
WO2004066671A1 true WO2004066671A1 (fr) 2004-08-05

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PCT/CN2004/000036 WO2004066671A1 (fr) 2003-01-20 2004-01-13 Circuit magnetique plan en serie, et transducteur sonore pour appareil electrique

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CN (1) CN1253056C (fr)
WO (1) WO2004066671A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11172309B2 (en) 2018-01-08 2021-11-09 Shenzhen Voxtech Co., Ltd. Bone conduction speaker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102752697A (zh) * 2012-07-10 2012-10-24 汉得利（常州）电子有限公司 多磁路系统的扬声器
CN103796120A (zh) * 2013-10-28 2014-05-14 广州市番禺奥迪威电子有限公司 一种压电式受话器

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105067A1 (de) * 1991-02-19 1991-12-12 Kraemer Rudolf Magnete fuer elektrodynamische wandler
CN2266243Y (zh) * 1996-06-13 1997-10-29 陈正宗 同轴双磁场双音圈扬声器
JPH10304493A (ja) * 1997-04-25 1998-11-13 Sony Corp 電気−音響変換装置及び音響−電気変換装置
CN2508509Y (zh) * 2001-07-18 2002-08-28 北京华本电子有限公司 电声转换装置
CN2590318Y (zh) * 2002-11-14 2003-12-03 志丰电子股份有限公司 强化磁通回路的扬声器

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4105067A1 (de) * 1991-02-19 1991-12-12 Kraemer Rudolf Magnete fuer elektrodynamische wandler
CN2266243Y (zh) * 1996-06-13 1997-10-29 陈正宗 同轴双磁场双音圈扬声器
JPH10304493A (ja) * 1997-04-25 1998-11-13 Sony Corp 電気−音響変換装置及び音響−電気変換装置
CN2508509Y (zh) * 2001-07-18 2002-08-28 北京华本电子有限公司 电声转换装置
CN2590318Y (zh) * 2002-11-14 2003-12-03 志丰电子股份有限公司 强化磁通回路的扬声器

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11172309B2 (en) 2018-01-08 2021-11-09 Shenzhen Voxtech Co., Ltd. Bone conduction speaker
US11197100B2 (en) 2018-01-08 2021-12-07 Shenzhen Voxtech Co., Ltd. Bone conduction speaker
US11310602B2 (en) 2018-01-08 2022-04-19 Shenzhen Shokz Co., Ltd. Bone conduction speaker
US11711654B2 (en) 2018-01-08 2023-07-25 Shenzhen Shokz Co., Ltd. Bone conduction speaker
US11765510B2 (en) 2018-01-08 2023-09-19 Shenzhen Shokz Co., Ltd. Bone conduction speaker
US11778384B2 (en) 2018-01-08 2023-10-03 Shenzhen Shokz Co., Ltd. Bone conduction speaker

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Publication number Publication date
CN1446024A (zh) 2003-10-01
CN1253056C (zh) 2006-04-19

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