CN103024650A - Giant magnetostrictive rare-earth transducer for parametric loudspeaker - Google Patents
Giant magnetostrictive rare-earth transducer for parametric loudspeaker Download PDFInfo
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- CN103024650A CN103024650A CN2012105530486A CN201210553048A CN103024650A CN 103024650 A CN103024650 A CN 103024650A CN 2012105530486 A CN2012105530486 A CN 2012105530486A CN 201210553048 A CN201210553048 A CN 201210553048A CN 103024650 A CN103024650 A CN 103024650A
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- earth
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- magnetostrictive rare
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Abstract
A giant magnetostrictive rare-earth transducer for a parametric loudspeaker comprises a bottom board, a giant magnetostrictive rare-earth rod, a coil, a telescopic rod cavity, vibrating plate fixing screws, a vibrating plate, elastic ring fixing screws, a fixed elastic ring and bottom board fixing screws. The transducer for the parametric loudspeaker can generate high sound power by the aid of the advantages of high mechanical energy to electric energy conversion rate, high energy density, high response speed, fine reliability and simple driving mode of giant magnetostrictive rare-earth materials at room temperature, and has significance for solving the problem of low output sound power of a parametric array loudspeaker.
Description
Technical field
A kind of transducer relates in particular to the super magnetostrictive rare-earth transducer that a kind of parametric loudspeaker is used.
Background technology
Parametric loudspeaker is a kind of New-type loudspeaker that occurs in recent years, can realize that the high directivity of audio signal is propagated.The transducer of at present parametric loudspeaker use generally adopts piezoelectric ceramic transducer or pvdf membrane transducer.The used piezoelectric ceramic of piezoelectric ceramic transducer has larger fragility, therefore be difficult to obtain very large acoustical power by this type of transducer, and the transducer volume of making in low-frequency range is very large; Also there is the problem that bandwidth is narrower, remained shock is larger simultaneously in this type of transducer.Although the pvdf membrane transducer can be made the transducer of arbitrary shape, and broader bandwidth, there is equally the lower problem of acoustical power.
At room temperature mechanical energy-energy conversion rate is high, energy density is large, response speed is high for the super magnetostrictive rare-earth material, good reliability, type of drive are simple, therefore can be used as the high-power transducer that parametric array loudspeaker uses and makes material.
Summary of the invention
The object of the present invention is to provide a kind of parametric loudspeaker super magnetostrictive rare-earth transducer, to solve the less problem of parametric acoustic array output acoustic power of loudspeaker.
The objective of the invention is to be realized by following technical scheme.
A kind of parametric loudspeaker comprises with the super magnetostrictive rare-earth transducer:
Base plate be used for to be installed parametric loudspeaker with each parts of super magnetostrictive rare-earth transducer, and as base to lay transducer; Base plate is fixed on the extension stem cavity by the base plate hold-down screw.
The super magnetostrictive rare-earth rod is used for producing vibration under magnetic fields, promotes the vibrating reed sounding.
Coil is for generation of magnetic field.
The extension stem cavity is used for installing the super magnetostrictive rare-earth rod, has the hole at cavity wall, to draw coil wire.
Fixedly elastic ring is used for the super magnetostrictive rare-earth rod is fixed in the extension stem cavity; Fixedly elastic ring must have favorable elasticity, so that the vibration of super magnetostrictive rare-earth rod; Fixedly elastic ring is fixed on the extension stem cavity with the elastic ring hold-down screw.
Vibrating reed, its resonance frequency are positioned at ultrasonic section, are fixed on the super magnetostrictive rare-earth rod by the vibrating reed hold-down screw, by the generation of vibration corresponding vibration of super magnetostrictive rare-earth rod.
The sound that sound source produces is processed into the signal of the pre-output of parametric array loudspeaker by the parametric source signal processing circuit, after the power amplifier amplification, drive the super magnetostrictive rare-earth rod and produce vibration, the vibrating reed that drive is fixed thereon produces vibration, sends the ultrasonic signal that carries audio signal.When this ultrasonic signal is propagated, by the aerial nonlinear interaction of parametric acoustic array, certainly demodulate the high directivity audio signal in air.
The present invention utilizes the super magnetostrictive rare-earth rod can produce the ability of high-power sound wave output, and a kind of parametric loudspeaker super magnetostrictive rare-earth transducer is provided.Because parametric acoustic array is non-linear from the demodulation effect, the sub-fraction of the ultrasonic energy that transducer can be produced is converted to the high directivity audio frequency sound, this efficient is very low, when therefore improving ultrasonic power by parametric loudspeaker with the super magnetostrictive rare-earth transducer, can make from the power that demodulates the directive property audio frequency sound that comes and obtain corresponding raising.This has very positive meaning to solving the low problem of the ubiquitous audio frequency sound power output of acoustic current parametric array loudspeaker.
Description of drawings
Figure 1 shows that parametric loudspeaker super magnetostrictive rare-earth transducer architecture.
Figure 2 shows that parametric loudspeaker super magnetostrictive rare-earth transducer plan view from above.
Embodiment
Fig. 1 shows parametric loudspeaker super magnetostrictive rare-earth transducer implementation structure.This transducer is by base plate 1, super magnetostrictive rare-earth rod 2, coil 3, extension stem cavity 4, vibrating reed hold-down screw 5, vibrating reed 6, elastic ring hold-down screw 7, fixedly elastic ring 8, base plate hold-down screw 9 form.
Sound source produces audio signal to be played, obtains the signal that the parametric acoustic array loud speaker is intended output by the parametric source signal processing circuit; Output on the coil 3 after this signal amplifies by power amplifier and produce alternating magnetic field; This magnetic field makes super magnetostrictive rare-earth rod 2 produce vibration, thereby drives vibrating reed 6 vibrations, thereby produces ultrasonic signal; This ultrasonic signal in the communication process, demodulates the audio frequency sound with high directivity by the parametric acoustic array effect certainly in air.
Fig. 2 shows parametric loudspeaker super magnetostrictive rare-earth transducer plan view from above.Transducer driver is by super magnetostrictive rare-earth rod 2, coil 3, extension stem cavity 4, elastic ring hold-down screw 7, fixedly elastic ring 8 forms.For improving the sound wave power output, generally adopt a plurality of transducer drivers.The parametric loudspeaker that contains four transducer drivers super magnetostrictive rare-earth transducer has been shown among Fig. 2, has generally adopted symmetrical arrangement.At this moment, must guarantee transducer driver resonance frequency, phase equalization, error is not more than 1%.
Claims (4)
1. super magnetostrictive rare-earth transducer that parametric loudspeaker is used comprises:
Base plate be used for to be installed parametric loudspeaker with each parts of super magnetostrictive rare-earth transducer, and as base to lay transducer;
The super magnetostrictive rare-earth rod is used for producing vibration under magnetic fields, promotes the vibrating reed sounding;
Coil is for generation of magnetic field;
The extension stem cavity is used for installing the super magnetostrictive rare-earth rod, has the hole at cavity wall, to draw coil wire;
Fixedly elastic ring is used for the super magnetostrictive rare-earth rod is fixed in the extension stem cavity;
Vibrating reed is fixed on the super magnetostrictive rare-earth rod by the vibrating reed hold-down screw, by the generation of vibration corresponding vibration of super magnetostrictive rare-earth rod;
Sound source produces audio signal to be played, obtains the signal that the parametric acoustic array loud speaker is intended output by the parametric source signal processing circuit; Output to after this signal amplifies by power amplifier and produce alternating magnetic field on the coil; This magnetic field makes the super magnetostrictive rare-earth rod produce vibration, thereby drives the vibrating reed vibration, thereby produces ultrasonic signal; This ultrasonic signal in the communication process, demodulates the audio frequency sound with high directivity by the parametric acoustic array effect certainly in air.
2. super magnetostrictive rare-earth transducer according to claim 1 is characterized in that, described base plate is fixed on the extension stem cavity by the base plate hold-down screw; Described coil is around on the super magnetostrictive rare-earth rod, and draws coil lead and receive on the power amplifier by the aperture on the extension stem cavity; Described fixedly elastic ring is fixed in the super magnetostrictive rare-earth rod on the extension stem cavity by the elastic ring hold-down screw.
3. super magnetostrictive rare-earth transducer according to claim 1 is characterized in that, fixedly elastic ring is selected thin and material that elasticity is large is made, and guarantees that the vibration resistance that the extension stem cavity is subject to is less.
4. super magnetostrictive rare-earth transducer according to claim 1 is characterized in that, super magnetostrictive rare-earth rod, coil, extension stem cavity, elastic ring hold-down screw, fixedly elastic ring forms transducer driver jointly; Described super magnetostrictive rare-earth transducer is made of one or more transducer drivers, adopts symmetric mode to arrange; The resonance frequency of transducer driver and phase place must keep consistency, and error is not more than 1%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105530486A CN103024650A (en) | 2012-12-19 | 2012-12-19 | Giant magnetostrictive rare-earth transducer for parametric loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105530486A CN103024650A (en) | 2012-12-19 | 2012-12-19 | Giant magnetostrictive rare-earth transducer for parametric loudspeaker |
Publications (1)
| Publication Number | Publication Date |
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| CN103024650A true CN103024650A (en) | 2013-04-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105530486A Pending CN103024650A (en) | 2012-12-19 | 2012-12-19 | Giant magnetostrictive rare-earth transducer for parametric loudspeaker |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108463292A (en) * | 2016-01-07 | 2018-08-28 | 奥林巴斯株式会社 | Vibration transfer member, ultrasonic treatment apparatus and vibration body unit |
| 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 (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009005197A (en) * | 2007-06-24 | 2009-01-08 | Fureei Kk | Vibration device |
| CN101366320A (en) * | 2005-12-22 | 2009-02-11 | 弗锐株式会社 | Magnetostriction apparatus |
| CN102150290A (en) * | 2008-09-10 | 2011-08-10 | 松下电器产业株式会社 | Magnetorestrictive actuator and speaker and device using said magnetorestrictive actuator |
-
2012
- 2012-12-19 CN CN2012105530486A patent/CN103024650A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101366320A (en) * | 2005-12-22 | 2009-02-11 | 弗锐株式会社 | Magnetostriction apparatus |
| JP2009005197A (en) * | 2007-06-24 | 2009-01-08 | Fureei Kk | Vibration device |
| CN102150290A (en) * | 2008-09-10 | 2011-08-10 | 松下电器产业株式会社 | Magnetorestrictive actuator and speaker and device using said magnetorestrictive actuator |
Non-Patent Citations (1)
| Title |
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| 陈敏: ""声频定向系统理论与关键技术研究"", 《中国优秀博士论文库》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108463292A (en) * | 2016-01-07 | 2018-08-28 | 奥林巴斯株式会社 | Vibration transfer member, ultrasonic treatment apparatus and vibration body unit |
| 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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Application publication date: 20130403 |