CN105376681A - Planar coil driven film loudspeaker - Google Patents
Planar coil driven film loudspeaker Download PDFInfo
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- CN105376681A CN105376681A CN201510831552.1A CN201510831552A CN105376681A CN 105376681 A CN105376681 A CN 105376681A CN 201510831552 A CN201510831552 A CN 201510831552A CN 105376681 A CN105376681 A CN 105376681A
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- loud speaker
- magnetostriction effect
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Abstract
The present invention discloses a planar coil driven film loudspeaker, belonging to the technical field of electroacoustic transducers. The planar coil driven film loudspeaker comprises a planar spiral coil (1) provided on an upper end surface of a housing (12), leads of coil electrode pair (5) connected with the planar spiral coil and a silicon chip (4) tightly embedded in the shell. A permanent magnet ring (6) is embedded inside the silicon chip which is plated with an inverse magnetostrictive effect film (3) on an upper surface thereof and plated with a positive magnetostrictive effect film (10) on a lower surface thereof. The silicon chip is connected with a sound film (7) via a coupler (9) that vertically passes through a guide ring (11) provided in the housing. The planer coil driven film loudspeaker has fast frequency response, high energy transmission density, high loading capacity and large strain, can significantly improve the stability, sensitivity, fidelity and tone quality thereof, significantly reduces the volume thereof so as to be convenient for integration at the same time, and has good dielectric property and high-frequency insulation and stable working performance.
Description
Technical field
The present invention relates to a kind of loud speaker, specifically a kind of planar coil drive-type film-type loud speaker, belongs to electroacoustic transducer technical field.
Background technology
Along with the fast development of electroacoustic techniques, loud speaker, as the core parts in high-fidelity electroacoustics system, has now been widely used in the numerous areas such as video display broadcast and interconnected communication.The operation principle of loud speaker is a kind of energy transducer AC audio signal being changed into acoustical signal, and the quality of its performance is very large on the impact of tonequality.Loud speaker can be divided into electromagnetic type, moving-coil type, electrostatic and piezoelectric type by the difference of type of drive.
But in the prior art at present, electromagnetic type needs specific field generating unit, volume is comparatively large, is difficult to realize in multimedia high-fidelity electroacoustics system integrated; The requirement of electrostatic drive-type to voltage is higher, is difficult to realize custom circuit and controls; There is the phenomenons such as drift and electrical breakdown in driving type piezoelectric actuator, makes it apply and be restricted.The executive component of planar coil drive-type film-type loud speaker adopts giant magnetostrictive thin film, has the excellent properties such as driving frequency is high, fast response time, strain is large, Energy Transfer density is high; By planar spiral winding, it is driven, effectively reduce the volume of loud speaker.Therefore the present invention has that frequency response is high, volume is little, is easy to the advantageous feature such as microminiaturized, tonequality is good, is convenient to integrated and stable work in work.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides a kind of planar coil drive-type film-type loud speaker, have that driving frequency is high, fast response time, strain is large, Energy Transfer density is high, tonequality is good excellent properties; The volume of significant reduction loud speaker; Be convenient to integrated and stable work in work.
To achieve these goals, this planar coil drive-type film-type loud speaker comprises the planar spiral winding being located at shell upper surface, and the coil electrode be connected with described planar spiral winding to lead-in wire, and closely embeds silicon chip in the enclosure;
The inside of described silicon chip is embedded with permanent magnetism annulus, and the upper surface of described silicon chip is coated with counter magnetostriction effect film, and lower surface is coated with direct magnetostriction effect film;
Described silicon chip is connected with sound film by coupler, and described coupler is vertically through the guide ring be located in shell.
Further, described planar spiral winding is become with microelectroforming technology deposited seed layer copper by silica-based fine process, and described planar spiral winding is coated with insulating protective layer.
Further, described counter magnetostriction effect film is SmFe alloy, described direct magnetostriction effect thin-film material is TbDyFe alloy, and described counter magnetostriction effect film and direct magnetostriction effect film are equipped with two panels, are plated in the both side surface of described silicon chip by radio-frequency magnetron sputter method.
Further, described counter magnetostriction effect film and direct magnetostriction effect film and all leave gap between shell and guide ring.
Further, described permanent magnetism annulus is embedded in the inside of silicon chip by micro-electromechanical processing technology.
Further, described silicon chip is made up of the disc silicon sheet with high-tension material.
Further, described sound film is made up of the polypropylene material of good tensile yield degree, and the below of described sound film is provided with dust cover.
Further, described shell is made up by bonding technology of glass-silicon-glass.
Compared with prior art, this planar coil drive-type film-type loud speaker has following beneficial effect:
1, the present invention is compared with existing loud speaker, utilize giant magnetostrictive thin film as executive component, have that frequency response is fast, Energy Transfer density is high, load capacity is strong, strain the features such as large, therefore can significantly improve the service behaviour such as stability sensitivity, fidelity, tonequality of loud speaker;
2, the present invention adopts planar spiral winding as driving element, and not only structure is simple but also can reduce the volume of loud speaker significantly, and what be convenient to realize with multimedia hardware system is integrated;
3, the present invention take polypropylene as sound membrane material, except hot strength height, also possesses good dielectric property and high-frequency insulation, effectively can improve the job stability of loud speaker.
Accompanying drawing explanation
Fig. 1 is agent structure schematic diagram of the present invention;
Fig. 2 is stereochemical structure decomposing schematic representation of the present invention;
In figure: 1, planar spiral winding, 2, insulating protective layer, 3, counter magnetostriction effect film, 4, silicon chip; 5, coil electrode is to lead-in wire, and 6, permanent magnetism annulus, 7, sound film, 8, dust cover; 9, coupler, 10, direct magnetostriction effect film, 11, guide ring, 12, shell.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described.
As depicted in figs. 1 and 2, this planar coil drive-type film-type loud speaker comprises the planar spiral winding 1 being located at shell 12 upper surface, and the coil electrode be connected with described planar spiral winding 1 to lead-in wire 5, and is closely embedded in the silicon chip 4 in shell 12;
The inside of described silicon chip 4 is embedded with permanent magnetism annulus 6, and the upper surface of described silicon chip 4 is coated with counter magnetostriction effect film 3, and lower surface is coated with direct magnetostriction effect film 10;
Described silicon chip 4 is connected with sound film 7 by coupler 9, and described coupler 9 is vertically through the guide ring 11 be located in shell 12.
Described permanent magnetism annulus 6 produces constant bias magnetic field, can not only effectively avoid " frequency-doubled effect ", and counter magnetostriction effect film 3 can be made to be within the good range of linearity with the coefficient of dilatation of direct magnetostriction effect film 10.When passing into AC audio electric current to planar spiral winding 1, planar spiral winding 1 can produce the magnetic field of alternation, counter magnetostriction effect film 3 and direct magnetostriction effect film 10 can change bending in the magnetic field of alternation, thus make silicon chip 4 up-down vibration, drive sound film 7 to vibrate simultaneously.
Further, described planar spiral winding 1 is become with microelectroforming technology deposited seed layer copper by silica-based fine process, and described planar spiral winding 1 is coated with insulating protective layer 2.Coil electrode passes from insulating protective layer 2 lead-in wire 5, insulating protective layer 2 can available protecting planar spiral winding 1 in atmosphere not exposed and occur the phenomenon that oxidized, corrosion etc. was lost efficacy.
Further, described counter magnetostriction effect film 3 is SmFe alloy, described direct magnetostriction effect film 10 material is TbDyFe alloy, described counter magnetostriction effect film 3 is equipped with two panels with direct magnetostriction effect film 10, is plated in the both side surface of described silicon chip 4 by radio-frequency magnetron sputter method.SmFe alloy and TbDyFe alloy are giant magnetostrictive material, have that Energy Transfer density is high, fast response time, driving frequency are high, load capacity is strong and strain the features such as large.
Further, described counter magnetostriction effect film 3 and direct magnetostriction effect film 10 and all leave gap between shell 12 and guide ring 11.Can effectively reduce and be located at magnetic field that planar spiral winding 1 on shell 12 the produces influence of magnetic field axially at counter magnetostriction effect film 3 and direct magnetostriction effect film 10.
Further, described permanent magnetism annulus 6 is embedded in the inside of silicon chip 4 by micro-electromechanical processing technology.
Further, described silicon chip 4 is made up of the disc silicon sheet with high-tension material.
Further, described sound film 7 is made up of the polypropylene material of good tensile yield degree, and the below of described sound film 7 is provided with dust cover 8.Ensure that sound film 7 self has the performance of vibration and response fast preferably in high frequency, adopt dust cover 8 can play protective action to sound film 7 simultaneously.
Further, described shell 12 is made up by bonding technology of glass-silicon-glass.
The specific works principle of this planar coil drive-type film-type loud speaker is as follows:
Permanent magnetism annulus 6 produces constant bias magnetic field, and counter magnetostriction effect film 3 and direct magnetostriction effect film 10 have good stability and operating characteristic under the effect of this bias magnetic field.When passing into the AC audio electric current of size variation to planar spiral winding 1, planar spiral winding 1 produces the alternating magnetic field of a magnitude of field intensity change under the effect of this electric current, when alternating magnetic field increases at forward, direct magnetostriction effect film 10 extends gradually under its effect, counter magnetostriction effect film 3 shortens gradually, silicon chip 4 is bent downwardly, drives sound film 7 to vibrate downwards by coupler 9; When alternating magnetic field forward is reduced to zero gradually and continues oppositely to increase, direct magnetostriction effect film 10 shortens gradually under its magnetic fields, counter magnetostriction effect film 3 extends gradually, makes silicon chip 4 recover former length gradually and be bent upwards, and drives sound film 7 upwards to vibrate by coupler 9.
Along with the size of AC audio electric current constantly changes, the field intensity direction of the alternating magnetic field of generation and size also in continuous change, thus make silicon chip 4 drive sound film about 7 constantly to vibrate, and realize the sounding of loud speaker.The frequency of AC audio electric current and varying in size, the frequency that sound film 7 vibrates is also different with amplitude.Energy Transfer density is high, fast response time, driving frequency are high, load capacity is strong and strain the features such as large to adopt the counter magnetostriction effect film 3 of giant magnetostrictive material to have with direct magnetostriction effect film 10, sound film 7 vibration in high frequency and response fast can be realized, improve the tonequality of loud speaker and fidelity, be applicable to realize in multimedia high-fidelity electroacoustics system integrated.
In sum, the frequency response of this planar coil drive-type film-type loud speaker is fast, Energy Transfer density is high, load capacity is strong, strain is large, can significantly improve the stability of loud speaker, sensitivity, fidelity and tonequality; Significantly reduce the volume of loud speaker simultaneously, be convenient to integrated and; Possess good dielectric property and high-frequency insulation, stable work in work.
Claims (8)
1. a planar coil drive-type film-type loud speaker, is characterized in that,
Comprise the planar spiral winding (1) being located at shell (12) upper surface, the coil electrode be connected with described planar spiral winding (1) to go between (5), and is closely embedded in the silicon chip (4) in shell (12);
The inside of described silicon chip (4) is embedded with permanent magnetism annulus (6), the upper surface of described silicon chip (4) is coated with counter magnetostriction effect film (3), and lower surface is coated with direct magnetostriction effect film (10);
Described silicon chip (4) is connected with sound film (7) by coupler (9), and described coupler (9) is vertically through the guide ring (11) be located in shell (12).
2. a kind of planar coil drive-type film-type loud speaker according to claim 1, is characterized in that,
Described planar spiral winding (1) is become with microelectroforming technology deposited seed layer copper by silica-based fine process, described planar spiral winding (1) is coated with insulating protective layer (2).
3. a kind of planar coil drive-type film-type loud speaker according to claim 1, is characterized in that,
Described counter magnetostriction effect film (3) is SmFe alloy, described direct magnetostriction effect film (10) material is TbDyFe alloy, described counter magnetostriction effect film (3) and direct magnetostriction effect film (10) are equipped with two panels, are plated in the both side surface of described silicon chip (4) by radio-frequency magnetron sputter method.
4. a kind of planar coil drive-type film-type loud speaker according to claim 1 or 3, is characterized in that,
Described counter magnetostriction effect film (3) and direct magnetostriction effect film (10) and all leave gap between shell (12) and guide ring (11).
5. a kind of planar coil drive-type film-type loud speaker according to claim 1, is characterized in that,
Described permanent magnetism annulus (6) is embedded in the inside of silicon chip (4) by micro-electromechanical processing technology.
6. a kind of planar coil drive-type film-type loud speaker according to claim 1, is characterized in that,
Described silicon chip (4) is made up of the disc silicon sheet with high-tension material.
7. a kind of planar coil drive-type film-type loud speaker according to claim 1, is characterized in that,
Described sound film (7) is made up of the polypropylene material of good tensile yield degree, and the below of described sound film (7) is provided with dust cover (8).
8. a kind of planar coil drive-type film-type loud speaker according to claim 1, is characterized in that,
Described shell (12) is made up by bonding technology of glass-silicon-glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510831552.1A CN105376681B (en) | 2015-11-24 | 2015-11-24 | A kind of planar coil drive-type film-type loud speaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510831552.1A CN105376681B (en) | 2015-11-24 | 2015-11-24 | A kind of planar coil drive-type film-type loud speaker |
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| CN105376681A true CN105376681A (en) | 2016-03-02 |
| CN105376681B CN105376681B (en) | 2018-06-12 |
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| CN201510831552.1A Expired - Fee Related CN105376681B (en) | 2015-11-24 | 2015-11-24 | A kind of planar coil drive-type film-type loud speaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109862495A (en) * | 2019-04-11 | 2019-06-07 | 贵州电网有限责任公司 | A kind of communication system of power grids equipment magnetostriction loudspeaker |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080205674A1 (en) * | 2005-04-28 | 2008-08-28 | Hirofumi Onohara | Super Magnetostriction Speaker |
| CN103152679A (en) * | 2013-03-14 | 2013-06-12 | 胡宗科 | Electromagnetism transient magnetic loudspeaker |
| CN204272378U (en) * | 2014-12-30 | 2015-04-15 | 安徽理工大学电子设备厂 | A kind of loud speaker based on giant magnetostrictive thin film |
| CN204442684U (en) * | 2015-03-24 | 2015-07-01 | 安徽理工大学 | A kind of giant magnetostrictive thin film sound transducer |
-
2015
- 2015-11-24 CN CN201510831552.1A patent/CN105376681B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080205674A1 (en) * | 2005-04-28 | 2008-08-28 | Hirofumi Onohara | Super Magnetostriction Speaker |
| CN103152679A (en) * | 2013-03-14 | 2013-06-12 | 胡宗科 | Electromagnetism transient magnetic loudspeaker |
| CN204272378U (en) * | 2014-12-30 | 2015-04-15 | 安徽理工大学电子设备厂 | A kind of loud speaker based on giant magnetostrictive thin film |
| CN204442684U (en) * | 2015-03-24 | 2015-07-01 | 安徽理工大学 | A kind of giant magnetostrictive thin film sound transducer |
Non-Patent Citations (1)
| Title |
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| 寇旗旗等，: ""基于双平面线圈驱动的GMM薄膜微泵"", 《液压与气动》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109862495A (en) * | 2019-04-11 | 2019-06-07 | 贵州电网有限责任公司 | A kind of communication system of power grids equipment magnetostriction loudspeaker |
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| CN105376681B (en) | 2018-06-12 |
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