CN2857391Y - Magnetic circuit system and moving-coil electroacoustic transducer adopting the same - Google Patents
Magnetic circuit system and moving-coil electroacoustic transducer adopting the same Download PDFInfo
- Publication number
- CN2857391Y CN2857391Y CN 200520067645 CN200520067645U CN2857391Y CN 2857391 Y CN2857391 Y CN 2857391Y CN 200520067645 CN200520067645 CN 200520067645 CN 200520067645 U CN200520067645 U CN 200520067645U CN 2857391 Y CN2857391 Y CN 2857391Y
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- iron
- voice coil
- base
- pole piece
- protuberance
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Abstract
The utility model relates to a magnetic circuit system, comprising a piece of T-shaped iron, two pieces of magnetic iron and a pole piece, wherein the T-shaped iron contains a base and a projection. The cross-section of the projection parallel to the base is of narrow and long strip shape. Said magnetic ion contains two pieces of strip magnetic iron, which are disposed on the base of the T-shaped iron along the length direction and are symmetrically distributed at the two sides of the T-shaped iron projection. Said pole piece, covering said magnetic iron, is provided with a through hole sorted with the projection of the T-shaped iron. The utility model also relates to a moving-coil type electroacoustic transducer using said magnetic circuit system, comprising a magnetic circuit system, a vibration system, a front cover and a basin frame, wherein the vibration system contains a vibration film and a voice coil. The voice coil is of narrow and long type, pasting at the reverse side of said vibration film. If the lateral size of the electroacoustic transducer in the utility model is reduced, such as smaller than 6mm, ideal frequency region and voice volume can still be obtained. The utility model is also characterized in simple process.
Description
Technical field
The utility model relates to a kind of electroacoustic transducer, relates in particular to a kind of magnetic circuit system and adopts the moving-coil type electroacoustic transducer of this system, as be used for the coil-moving speaker or the moving coil receiver of mobile phone.
Background technology
Mobile phone products become more diverse and the evolution of miniaturization in, mobile phone is also reducing its volume with components and parts as far as possible, reserves enough spaces with integrated more function in mobile phone.But the microphone device in mobile phone when constantly dwindling as the volume of Microspeaker and micro-telephone receiver, can influence its output volume and tonequality undoubtedly.For this reason, people are deformed into cuboid with traditional circular loudspeakers or receiver outward appearance, and product adopts the internal magnetization structure usually, can work as product further dwindles, when especially lateral dimension reduced, when being respectively 7 * 11mm, 6 * 15mm and 5 * 15mm as Microspeaker or the receiver cross section parallel with vibrating diaphragm, lateral dimension corresponded to 7mm, 6mm and 5mm, the magnet lateral dimension that is wherein adopted is less than 3mm, even 2mm.In this case, the magnetic field intensity that magnet can provide in the internal magnetization constructed products will reduce gradually with the magnet volume, and the output volume of product (SPL) is restricted again.Simultaneously, when adopting the internal magnetization structure, the size that reduces voice coil loudspeaker voice coil also has a lower limit (lateral dimension of voice coil loudspeaker voice coil is greater than the magnet lateral dimension), and bigger voice coil loudspeaker voice coil takies original just very narrow vibrating diaphragm ring width, make the F0 of microphone device higher, the effective frequency response range diminishes.In order to address this problem, people have expected the external magnetic type structure that once adopted originally naturally in big speaker product, are about to magnet and are arranged at outside the voice coil loudspeaker voice coil and change the magnet that occupy the voice coil loudspeaker voice coil center in the internal magnetization structure into T iron.
See also Fig. 1, open day is on September 15th, 2005, application number is to have disclosed the external magnetic type structure Microspeaker that a kind of outward appearance is a cuboid in the U.S. Patent application document of US2005/0201587, and magnet wherein is the writing board shape of band center hole, and voice coil loudspeaker voice coil and T iron occupy circular hole central authorities; Perhaps this magnet is divided into the identical two halves of size, respectively is with a semicircle breach, and when being arranged in the product, two semicircle breach form circular hole to place voice coil loudspeaker voice coil and T iron, specifically can be with reference to 10 among Fig. 1,10A and 10B.But the magnet processing technology of this kind structure is too complicated, and the required machining accuracy of assembling accurate miniature product is difficult to guarantee, obtains also to compare difficulty than high finished product rate.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of manufacture craft simple, and when whole lateral dimension hour, still can obtain the magnetic circuit system of desirable Hz-KHz and volume and adopt the moving-coil type electroacoustic transducer of this system.
For solving the problems of the technologies described above, the technical scheme that the utility model adopted is: a kind of magnetic circuit system is provided, and it comprises T iron, two blocks of magnet and pole piece, and described T iron comprises base and protuberance, and this protuberance cross section parallel with base is long narrow shape; Described magnet is two bar magnets, these two bar magnets are positioned on the base of described T iron along its length, and be symmetrically distributed in the both sides of described T iron protuberance, and offering the through hole that cooperates with this T iron protuberance in the described pole piece, this pole piece covers on the described magnet.
For solving above-mentioned another technical problem, the technical scheme that the utility model adopted is: a kind of moving-coil type electroacoustic transducer is provided, it comprises magnetic circuit system, vibrational system, protecgulum and basin frame, wherein magnetic circuit system comprises T iron, magnet and pole piece, vibrational system comprises vibrating diaphragm and voice coil loudspeaker voice coil, described T iron comprises base and protuberance, and this protuberance cross section parallel with base is long narrow shape; Described magnet is two bar magnets, these two bar magnets are positioned on the base of described T iron along its length, and be symmetrically distributed in the both sides of described T iron protuberance, offer the through hole that cooperates with this T iron protuberance in the described pole piece, this pole piece covers on the described magnet, described voice coil loudspeaker voice coil is long narrow shape, and this voice coil loudspeaker voice coil adheres to the reverse side of described vibrating diaphragm.
Further improvement in the technical proposal is: this base is runway shape, ellipse or rectangle.
The protuberance of the through hole in this voice coil loudspeaker voice coil, the pole piece and this T iron cross section parallel with base is runway shape, rectangle or ellipse.
The beneficial effects of the utility model are: because the magnet that the utility model adopts is two bar magnets, these two bar magnets are positioned on the base of this T iron along its length, therefore working as the whole lateral dimension of electroacoustic transducer of the present utility model dwindles, as less than 6mm the time, still can obtain desirable Hz-KHz and volume, and manufacture craft is simple.
Description of drawings
Fig. 1 is the schematic diagram of existing external magnetic type structure Microspeaker.
Fig. 2 is the exploded view of the utility model moving-coil type electroacoustic transducer.
Fig. 3 is the profile of moving-coil type electroacoustic transducer shown in Figure 2.
Fig. 4 is the front view of moving-coil type electroacoustic transducer shown in Figure 2.
Fig. 5 is the magnetic circuit system schematic diagram of moving-coil type electroacoustic transducer shown in Figure 2.
Embodiment
Moving-coil type electroacoustic transducer of the present utility model generally includes magnetic circuit system and vibrational system, and wherein magnetic circuit system mainly is made up of magnet, T iron or bowl-type magnetic conductor and pole piece etc., and vibrational system then is made of vibrating diaphragm and voice coil loudspeaker voice coil.See also Fig. 2 to Fig. 5, the base 12 of the T iron 1 that permeability magnetic material is made is rectangle, its protuberance 11 and base 12 parallel cross sections are runway shape, and two bar magnets 2 are positioned on the base 12 of T iron 1 along its length, and are symmetrically distributed in the both sides of T iron protuberance 11.Offer the runway shape through hole 31 that cooperates with T iron protuberance 11 in the pole piece 3 of magnetic conduction, pole piece 3 covers on the magnet 2, the height of the thickness sum of the thickness of pole piece 3 and magnet 2 and T iron protuberance 11 is approaching, thereby between magnet 2 and T iron 1, form to drive the required runway shape magnetic gap of voice coil loudspeaker voice coil 5, voice coil loudspeaker voice coil 5 is a runway shape, voice coil loudspeaker voice coil 5 is adhered to the reverse side of vibrating diaphragm 6, protecgulum 7 and T iron base 12 are with vibrating diaphragm 6, voice coil loudspeaker voice coil 5, be encapsulated in the basin frame 4 with above-mentioned magnetic gap etc., the two ends lead-out wire of voice coil loudspeaker voice coil 5 (figure do not show) is electrically connected with reed 41 and 42 in the basin frame 4 respectively, to connect external electric signal, the metal spring leaf 41 and 42 that is used for binding post is injection-moulded in plastic frame and is made into basin frame 4.
What moving-coil type electroacoustic transducer of the present utility model provided magnetic field is the bar magnet 2 that two branches are arranged, and its processing technology is simple, and obtains required machining accuracy easily.When the whole lateral dimension of miniature electro-acoustic transducer dwindles, as less than 6mm the time, adopt structure of the present utility model, the magnetic gap between bar magnet 2 and the T iron protuberance 11 is about 0.5mm, and magnetic field intensity therebetween can satisfy the designing requirement that driving voice coil loudspeaker voice coil 5 will reach.Simultaneously, adopt external magnetic type structure provided by the utility model, the lateral dimension of voice coil loudspeaker voice coil 5 can require to determine, thereby make this narrow long type electroacoustic transducer according to product design, still can obtain desirable Hz-KHz and volume as 5 * 15mm loud speaker, and manufacture craft is simple.
If the voice coil loudspeaker voice coil 5 that moving-coil type electroacoustic transducer of the present utility model adopts is a rectangle, then the through hole in the pole piece 3 also adopts rectangle accordingly, the protuberance 11 of T iron 1 and base 12 parallel cross sections also are rectangle, drive the required rectangle magnetic gap of rectangle voice coil loudspeaker voice coil thereby form.
If the voice coil loudspeaker voice coil 5 that moving-coil type electroacoustic transducer of the present utility model adopts is oval, then the through hole in the pole piece 3 also adopts oval accordingly, the protuberance 11 of T iron 1 and base 12 parallel cross sections also are oval, drive the required oval magnetic gap of rectangle voice coil loudspeaker voice coil thereby form.
In addition, but the base 12 of the utility model moving-coil type electroacoustic transducer also ovalize and rectangle.
Claims (10)
1, a kind of magnetic circuit system, it comprises T iron, magnet and pole piece, it is characterized in that: described T iron comprises base and protuberance, this protuberance cross section parallel with base is long narrow shape; Described magnet is two bar magnets, these two bar magnets are positioned on the base of described T iron along its length, and be symmetrically distributed in the both sides of described T iron protuberance, and offering the through hole that cooperates with this T iron protuberance in the described pole piece, this pole piece covers on the described magnet.
2. magnetic circuit system as claimed in claim 1 is characterized in that: described T iron base is runway shape, ellipse or rectangle.
3. magnetic circuit system as claimed in claim 1 is characterized in that: the protuberance cross section parallel with base of through hole in the described pole piece and described T iron is runway shape.
4. magnetic circuit system as claimed in claim 1 is characterized in that: the protuberance cross section parallel with base of through hole in the described pole piece and described T iron is rectangle.
5. magnetic circuit system as claimed in claim 1 is characterized in that: the protuberance cross section parallel with base of through hole in the described pole piece and described T iron is ellipse.
6, a kind of moving-coil type electroacoustic transducer, it comprises magnetic circuit system, vibrational system, protecgulum and basin frame, wherein magnetic circuit system comprises T iron, magnet and pole piece, vibrational system comprises vibrating diaphragm and voice coil loudspeaker voice coil, it is characterized in that: described T iron comprises base and protuberance, and this protuberance cross section parallel with base is long narrow shape; Described magnet is two bar magnets, these two bar magnets are positioned on the base of described T iron along its length, and be symmetrically distributed in the both sides of described T iron protuberance, offer the through hole that cooperates with this T iron protuberance in the described pole piece, this pole piece covers on the described magnet, described voice coil loudspeaker voice coil is long narrow shape, and this voice coil loudspeaker voice coil adheres to the reverse side of described vibrating diaphragm.
7. moving-coil type electroacoustic transducer as claimed in claim 6 is characterized in that: described base is runway shape, ellipse or rectangle.
8. moving-coil type electroacoustic transducer as claimed in claim 6 is characterized in that: the protuberance cross section parallel with base of through hole in described voice coil loudspeaker voice coil, the described pole piece and described T iron is runway shape.
9. moving-coil type electroacoustic transducer as claimed in claim 6 is characterized in that: the protuberance cross section parallel with base of through hole in described voice coil loudspeaker voice coil, the described pole piece and described T iron is rectangle.
10. moving-coil type electroacoustic transducer as claimed in claim 6 is characterized in that: the protuberance cross section parallel with base of through hole in described voice coil loudspeaker voice coil, the described pole piece and described T iron is ellipse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520067645 CN2857391Y (en) | 2005-11-12 | 2005-11-12 | Magnetic circuit system and moving-coil electroacoustic transducer adopting the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520067645 CN2857391Y (en) | 2005-11-12 | 2005-11-12 | Magnetic circuit system and moving-coil electroacoustic transducer adopting the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2857391Y true CN2857391Y (en) | 2007-01-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520067645 Expired - Lifetime CN2857391Y (en) | 2005-11-12 | 2005-11-12 | Magnetic circuit system and moving-coil electroacoustic transducer adopting the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2857391Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101662715B (en) * | 2009-09-15 | 2013-01-02 | 天津市洪波电子有限公司 | Multipurpose bidirectional horn loudspeaker |
| CN103024636A (en) * | 2012-12-14 | 2013-04-03 | 东星电声科技(东莞)有限公司 | Loudspeaker structure |
| CN101562768B (en) * | 2009-05-22 | 2013-04-10 | 瑞声声学科技(深圳)有限公司 | Minitype acoustic generator |
-
2005
- 2005-11-12 CN CN 200520067645 patent/CN2857391Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101562768B (en) * | 2009-05-22 | 2013-04-10 | 瑞声声学科技(深圳)有限公司 | Minitype acoustic generator |
| CN101662715B (en) * | 2009-09-15 | 2013-01-02 | 天津市洪波电子有限公司 | Multipurpose bidirectional horn loudspeaker |
| CN103024636A (en) * | 2012-12-14 | 2013-04-03 | 东星电声科技(东莞)有限公司 | Loudspeaker structure |
| CN103024636B (en) * | 2012-12-14 | 2016-04-20 | 东星电声科技(东莞)有限公司 | A kind of loadspeaker structure |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20070110 |
|
| EXPY | Termination of patent right or utility model |