JP2005236583A - Magnetostrictive multiplex vibrating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetostrictive multiplex vibrating device capable of multiplexing and outputting vibration of a plurality of kinds of frequencies while realizing miniaturization and cost reduction of the device. <P>SOLUTION: The magnetostrictive multiplex vibrating device 10 comprises a substantially bar-like super-magnetostrictive rod 14 which has one end 14A fixed on a mass 12 and has super-magnetostrictive members 20A, 20B; and a plurality of driving coils 16A, 16B arranged side by side along the rod 14, so as to surround the outer peripheries of the members 20A, 20B in this rod 14. The driving coils 16A, 16B are each simultaneously driven at different frequencies, thereby multiplex-vibrating the rod 14 at a plurality of kinds of frequencies. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a magnetostrictive multiple vibration device using a magnetostrictive member.

  Conventionally, various types of vibration devices have been proposed in which a single vibrator is used to generate a plurality of types of vibrations.

  For example, the vibration device 1 shown in FIG. 7 includes a dome-shaped vibrating body 2 and a vibrator 5 having a coil 3 and a magnet 4. The vibrating body 2 is disposed above the vibrating body 2. The collision part 6 is provided in the position which can contact (refer patent document 1).

  In the vibration device 1, in the sound frequency band of several hundred Hz to 3 kHz, the vibration body 2 is prevented from coming into contact with the collision portion 6, so that sound is output from the vibration body 2, and the vibration device 1 serves as a speaker. It is supposed to function. On the other hand, in the low frequency band of about several tens of Hz, as a result of the amplitude of the vibrating body 2 increasing compared to the audio frequency band, the vibrating body 2 comes into contact with the collision portion 6 and the vibrating device 1 functions as a vibrator. Yes. Thus, in the vibration device 1, the speaker function and the vibrator function can be realized by the single vibrator 5 by switching the frequency of the signal input to the vibrator 5.

JP 2000-350963 A

  However, the known vibration device 1 has a problem that the speaker function and the vibrator function cannot be realized at the same time. In addition, it is necessary to sequentially switch each function, which complicates the control and requires a circuit for switching the frequency, and there is a limit to downsizing and cost reduction of the apparatus.

  The present invention has been made to solve such problems, and at the same time achieves downsizing and cost reduction of the apparatus, and simultaneously multiplexes and outputs a plurality of types of vibrations. An object of the present invention is to provide a magnetostrictive multiple vibration device capable of performing

  As a result of earnest research, the inventor of the present invention has found a magnetostrictive multiple vibration device capable of multiplexing and outputting vibrations of a plurality of types of frequencies at the same time while realizing downsizing and cost reduction of the device. .

  That is, the above-described object can be achieved by the following present invention.

  (1) A substantially rod-shaped magnetostrictive rod having a magnetostrictive member, one end of which is fixed to a mass member, and a line along the magnetostrictive rod so as to surround the outer periphery of the magnetostrictive member in the magnetostrictive rod. A plurality of drive coils, and the magnetostrictive rod is capable of multiple vibrations at a plurality of types of frequencies by simultaneously driving the drive coils at different frequencies. apparatus.

  (2) The magnetostrictive multiple vibration device according to (1), wherein at least a vibration frequency signal and a sound frequency sound signal of the vibrator are input to the plurality of drive coils.

  (3) The magnetostrictive multiple vibration device according to (1), wherein at least a predetermined signal and a signal having an opposite phase to the predetermined signal are input to the plurality of drive coils.

  (4) The magnetostrictive multiple vibration device according to (1), wherein at least a predetermined signal and a signal obtained by delaying the predetermined signal are input to the plurality of drive coils.

  (5) The magnetostrictive rod is configured by stacking a plurality of the magnetostrictive members in the axial direction, and the plurality of magnetostrictive members are arranged in ascending order of the driving frequency of the magnetostrictive member from the mass member side. The magnetostrictive multiple vibration device according to any one of (1) to (4).

  (6) The magnetostrictive rod is configured by stacking a plurality of magnetostrictive members having different axial lengths in the axial direction, and the axial lengths of the magnetostrictive members are shortened in ascending order of the driving frequency of the magnetostrictive members. The magnetostrictive multiple vibration device according to any one of (1) to (5), wherein

  (7) The magnetostrictive rod is configured by stacking a plurality of magnetostrictive members having different shaft diameters in the axial direction, and the shaft diameters of the plurality of magnetostrictive members are reduced in ascending order of the driving frequency of the magnetostrictive members. The magnetostrictive multiple vibration device according to any one of (1) to (6), wherein:

  (8) The bias magnet for applying a bias magnetic field in the axial direction of the magnetostrictive member is disposed at both axial ends of the magnetostrictive member, according to any one of (1) to (7), Magnetostrictive multiple vibration device.

  (9) The magnetostrictive multiple vibration device according to any one of (1) to (8), wherein the magnetostrictive rod is formed in a substantially cylindrical shape.

  (10) The magnetostrictive multiple vibration device according to any one of (1) to (9), wherein a preload is applied in an axial direction of the magnetostrictive rod.

  (11) The magnetostrictive multiple vibration device according to any one of (1) to (10), wherein the magnetostrictive member is a giant magnetostrictive member made of a giant magnetostrictive element.

  According to the magnetostrictive multiplex vibration device of the present invention, there is an excellent effect that vibrations of a plurality of types of frequencies can be multiplexed and output at the same time while realizing downsizing and cost reduction of the device.

  A magnetostrictive multiple vibration device according to the present invention includes a substantially rod-shaped magnetostrictive rod having a magnetostrictive member, one end of which is fixed to a mass member, and the magnetostrictive rod so as to surround an outer periphery of the magnetostrictive member in the magnetostrictive rod. A plurality of drive coils arranged side by side, and by simultaneously driving each drive coil at different frequencies, the magnetostrictive rod can be subjected to multiple vibrations at a plurality of types of frequencies. Thus, the above problem is solved.

  Hereinafter, magnetostrictive multiple vibration devices according to Embodiments 1 to 4 of the present invention will be described in detail with reference to FIGS.

  As shown in FIG. 1, the magnetostrictive multiple vibration device 10 according to the first embodiment of the present invention includes a substantially rod-shaped giant magnetostrictive rod 14 whose one end 14 </ b> A is fixed to a mass member 12, and the giant magnetostrictive rod 14. The vibrating body 18 is fixed to the other end 14B of the giant magnetostrictive rod 14 and has two drive coils 16A and 16B arranged side by side. In addition, this to-be-vibrated body 18 is not limited to a plate-shaped member as shown in the figure, For example, the member of another shape, a human skull, etc. are included.

  The mass member 12 is for the displacement due to the expansion / contraction to be generated only on the vibrating body 18 side when the giant magnetostrictive rod 14 is driven to expand and contract, and the giant magnetostrictive rod 14 is driven to extend and contract to generate vibration. However, it is preferable to apply a member that does not vibrate the mass member 12, for example, a member having at least about 100 to 200 times the mass of the giant magnetostrictive rod 14. In other words, the mass member 12 preferably has a mass capable of exhibiting an inertial force of several hundred times the force generated when the giant magnetostrictive rod 14 expands and contracts.

  The giant magnetostrictive rod 14 fixed to the mass member 12 is disposed at two axial ends of the two giant magnetostrictive members 20A and 20B and the giant magnetostrictive members 20A and 20B. It comprises three bias magnets 22A, 22B, 22C for applying a bias magnetic field.

  The giant magnetostrictive members 20A and 20B use giant magnetostrictive elements as materials. Here, the “super magnetostrictive element” means a magnetostrictive element made of a powder sintered alloy or a single crystal alloy containing a rare earth element and / or a specific transition metal as a main component (for example, terbium, dysprosium, iron, etc.). It has the property of causing large displacement when a magnetic field is applied from the outside.

  The drive coils 16A and 16B are disposed so as to surround the outer peripheries of the giant magnetostrictive members 20A and 20B, respectively. The magnetostrictive multiple vibration device 10 is arranged in the axial direction of the giant magnetostrictive members 20A and 20B by the drive coils 16A and 16B. The coil magnetic field can be applied.

  Next, the operation of the magnetostrictive multiple vibration device 10 will be described.

  When a signal having a predetermined frequency is input to the drive coils 16A and 16B, the magnitude of the coil magnetic field applied to the giant magnetostrictive members 20A and 20B is changed by this signal. As a result, axial displacement occurs in the giant magnetostrictive members 20A and 20B due to the magnetostrictive effect, and the giant magnetostrictive rod 14 repeats expansion and contraction in the axial direction at a predetermined frequency and vibrates.

  By the way, in the magnetostrictive multiple vibration device 10, since the drive coils 16A and 16B are simultaneously driven at different frequencies, the super magnetostrictive members 20A and 20B vibrate at different frequencies according to the drive frequencies of the drive coils 16A and 16B, respectively. . Accordingly, the giant magnetostrictive rod 14 as a whole undergoes multiple vibrations at a plurality of types of frequencies.

  For example, when the vibration frequency signal of the vibrator is input to the drive coil 16A and the sound frequency signal is input to the drive coil 16B, the giant magnetostrictive rod 14 is vibrated by the vibration frequency signal of the vibrator and the sound frequency. Multiple vibrations occur due to the acoustic vibration caused by this signal. Here, the “vibration frequency of the vibrator” in the present invention means a frequency of about several tens of hertz to several hundreds of hertz, and generally means a frequency used for driving the vibrator. On the other hand, the “voice frequency” in the present invention refers to a frequency of about several hundred hertz to several tens of kilohertz other than the vibration frequency of the vibrator, and means a general human audible frequency.

  The super magnetostrictive members 20A and 20B are members having very low magnetic permeability. Therefore, interference of coil magnetic fields generated from the two drive coils 16A and 16B can be greatly reduced. That is, the giant magnetostrictive member 20A is driven only by the drive coil 16A and the giant magnetostrictive member 20B is driven only by the drive coil 16B, and the vibrations are multiplexed and transmitted to the vibrator 18 without substantially interfering with each other.

  FIG. 2 shows the results of an experiment conducted by the inventors of the present invention. In FIG. 2A, a vibration frequency signal and a sound frequency signal of a vibrator are simultaneously input to a conventional magnetostrictive vibration device constituted by a giant magnetostrictive rod made of one giant magnetostrictive member and one drive coil. It is the graph which showed the output waveform of the magnetostriction vibration apparatus in the case of doing. On the other hand, FIG. 2B shows a case where a vibration frequency signal of the vibrator is input to one of the drive coils 16A and 16B in the magnetostrictive multiple vibration device 10 of the first embodiment and a sound frequency signal is input to the other. 4 is a graph showing an output waveform of the magnetostrictive multiple vibration device 10.

  As a result of the experiment, as shown in FIG. 2B, in the magnetostrictive multiple vibration device 10 of the first embodiment, the vibrator vibration based on the vibration frequency signal of the vibrator and the acoustic vibration based on the sound frequency signal substantially interfere with each other. It was found that it was multiplexed and output without any problems.

  FIG. 3 shows another experimental result performed by the inventors of the present invention. FIG. 3A is a graph showing an output waveform of the magnetostrictive vibration device when a sound signal and a signal obtained by delaying the same sound signal are simultaneously input to a conventional magnetostrictive vibration device. On the other hand, FIG. 3B shows magnetostrictive multiplexing when an audio signal is input to one of the drive coils 16A and 16B in the magnetostrictive multiplex vibration device 10 of the first embodiment and the same audio signal is input to the other while being delayed. 3 is a graph showing an output waveform of the vibration device 10.

  As a result of the experiment, as shown in FIG. 3B, in the magnetostrictive multiple vibration device 10 of the first embodiment, the acoustic signal based on the audio signal and the acoustic vibration based on the signal obtained by delaying the same audio signal substantially interfere with each other. It was found that it was multiplexed and output without any problems.

  According to the magnetostrictive multiple vibration device 10 according to the first embodiment, a substantially rod-shaped giant magnetostrictive rod 14 having giant magnetostrictive members 20A and 20B having one end 14A fixed to the mass member 12, and the giant magnetostrictive rod. 14 and a plurality of drive coils 16A, 16B arranged along the giant magnetostrictive rod 14 so as to surround the outer periphery of the giant magnetostrictive members 20A, 20B, and each of the drive coils 16A, 16B. Since the giant magnetostrictive rod 14 can be subjected to multiple vibrations at a plurality of frequencies by simultaneously driving at different frequencies, it is possible to multiplex vibrations of a plurality of frequencies at the same time while reducing the size and cost of the device. Can be output.

  Therefore, for example, if a vibration frequency signal and a voice signal of a vibrator frequency are input to the drive coils 16A and 16B, a vibrator function is realized by the vibrator vibration and a speaker function is also achieved by the acoustic vibration. Can be realized.

  If a predetermined signal and a signal obtained by delaying the predetermined signal are input to the drive coils 16A and 16B, an echo effect or the like can be easily realized.

  Furthermore, if a predetermined signal and a signal opposite in phase to the predetermined signal are input to the drive coils 16A and 16B, output adjustment of the predetermined signal is performed by adjusting the signal level in the opposite phase. Can do.

  Further, since the bias magnets 22A, 22B, and 22C for applying a bias magnetic field in the axial direction of the giant magnetostrictive members 20A and 20B are disposed at both axial ends of the giant magnetostrictive members 20A and 20B, the amount of vibration is further increased. can do.

  Hereinafter, the magnetostrictive multiple vibration device 30 according to the second embodiment of the present invention will be described in detail with reference to FIG.

  As shown in the figure, the magnetostrictive multiple vibration device 30 according to the second embodiment is replaced by the substantially cylindrical mass member 32 and the super magnetostrictive rod 14 instead of the mass member 12 and the giant magnetostrictive rod 14 of the magnetostrictive multiple vibration device 10 according to the first embodiment. The magnetostrictive rods 34 are respectively applied. In addition, about the same part as the said Example 1, it shall attach | subject the same code | symbol in a figure, and the description is abbreviate | omitted.

  The substantially cylindrical mass member 32 and the giant magnetostrictive rod 34 are formed by a single bolt 36 penetrating the inner space and two nuts 38A and 38B screwed to both ends of the bolt 36. It is fixed to.

  The substantially cylindrical super magnetostrictive rod 34 includes two substantially cylindrical super magnetostrictive members 40A and 40B, and three substantially cylindrical bias magnets 42A disposed at both axial ends of the super magnetostrictive members 40A and 40B. 42B and 42C.

  According to the magnetostrictive multiple vibration device 30 according to the second embodiment, the preload is applied in the axial direction of the giant magnetostrictive rod 34 by the bolts 36 and nuts 38A and 38B. In comparison, the amount of vibration can be further increased.

  Further, since the giant magnetostrictive rod 34 is formed in a substantially cylindrical shape, it can be easily attached to the vibrating body 18 with bolts 36, nuts 38A, 38B, and the like.

  Hereinafter, the magnetostrictive multiple vibration device 50 according to the third embodiment of the present invention will be described in detail with reference to FIG.

  As shown in the figure, the magnetostrictive multiple vibration device 50 according to the third embodiment includes a plurality of three giant magnetostrictive members 52A, 52B, and 52C having different axial lengths L1, L2, and L3 (L1> L2> L3) in the axial direction. The super-magnetostrictive rod 54 configured to overlap, and the low-frequency drive coil 56A, the medium-frequency drive coil 56B, and the high-frequency drive coil 56C disposed so as to surround the three super-magnetostrictive members 52A, 52B, and 52C, respectively. Configured. The three giant magnetostrictive members 52A, 52B, and 52C have axial lengths L1, L2, and L3 that increase in ascending order of the driving frequency of the giant magnetostrictive members 52A, 52B, and 52C, that is, in the order of low frequency, medium frequency, and high frequency. In addition, they are arranged from the mass member 58 side to the vibrating body 18 side in ascending drive frequency order.

  According to the magnetostrictive multiple vibration device 50 according to the third embodiment, the giant magnetostrictive rod 54 is configured by overlapping a plurality of giant magnetostrictive members 52A, 52B, and 52C in the axial direction, and a plurality of giant magnetostrictive members 52A, 52B, Since 52C is arranged from the mass member 58 side in ascending order of the driving frequency, it is possible to suppress the attenuation of vibrations at a high frequency and to transmit vibrations of a plurality of types of frequencies to the vibrating body more efficiently. .

  In particular, since the axial lengths of the plurality of giant magnetostrictive members 52A, 52B, and 52C are made shorter in ascending order of the driving frequency of the giant magnetostrictive members 52A, 52B, and 52C, the change in sound pressure due to the frequency is reduced. Can do. That is, in general, in order to obtain the same sound pressure at all frequencies, an amplitude larger than the amplitude of the high frequency is required at the low frequency, but according to the magnetostrictive multiple vibration device 50 according to the third embodiment, the lower the frequency, the lower the frequency. The amount of vibration can be increased, and low-frequency sound pressure can be obtained at the same level as high-frequency sound pressure.

  Hereinafter, the magnetostrictive multiple vibration device 70 according to the fourth embodiment of the present invention will be described in detail with reference to FIG.

  As shown in the figure, the magnetostrictive multiple vibration device 70 according to Example 4 includes a plurality of super magnetostrictive members 72A, 72B, 72C having different shaft diameters R1, R2, R3 (R1> R2> R3) in the axial direction. The super magnetostrictive rod 74 configured to overlap with each other, and a low frequency drive coil 76A, a medium frequency drive coil 76B, and a high frequency drive coil 76C disposed so as to surround the three super magnetostrictive members 72A, 72B, and 72C, respectively. Configured. The three giant magnetostrictive members 72A, 72B, and 72C have shaft diameters R1, R2, and R3 that increase in ascending order of the driving frequencies of the giant magnetostrictive members 72A, 72B, and 72C, that is, in order of low frequency, medium frequency, and high frequency. In addition, they are arranged from the mass member 78 side to the vibrating body 18 side in ascending order of the drive frequency.

  According to the magnetostrictive multiple vibration device 70 according to the fourth embodiment, the giant magnetostrictive rod 74 is configured by overlapping a plurality of giant magnetostrictive members 72A, 72B, 72C in the axial direction, and a plurality of giant magnetostrictive members 72A, 72B, Since the shaft diameter of 72C is made thinner in ascending order of the driving frequency of the giant magnetostrictive members 72A, 72B, 72C, the amount of vibration can be increased at a lower frequency, and the change in sound pressure due to the frequency can be reduced. Can do.

  The magnetostrictive multiple vibration device according to the present invention is not limited to the structure and shape of the magnetostrictive multiple vibration devices 10, 30, 50 and 70 according to the first to fourth embodiments. For example, a giant magnetostrictive rod is used. A single giant magnetostrictive member may be used.

  In the case where it is not necessary to increase the vibration amount of the magnetostrictive multiple vibration device so much, a magnetostrictive member made of a magnetostrictive element may be applied instead of the super magnetostrictive member.

  That is, the magnetostrictive multiple vibration device according to the present invention includes a substantially rod-shaped magnetostrictive rod having a magnetostrictive member, one end of which is fixed to a mass member, and the magnetostrictive so as to surround an outer periphery of the magnetostrictive member in the magnetostrictive rod. A plurality of drive coils arranged side by side along the rod, and by simultaneously driving the drive coils at different frequencies, the magnetostrictive rod can be subjected to multiple vibrations at a plurality of types of frequencies. Anything that has been done.

  In addition, if the magnetostrictive multiple vibration device according to the present invention is applied to a speaker, it is not necessary to provide individual speakers for each frequency as in the prior art, and a wide sound range can be faithfully reproduced with one speaker. It is possible to easily reduce the cost and size of the speaker.

1 is a schematic side sectional view of a magnetostrictive multiple vibration device according to Embodiment 1 of the present invention. The graph (A) showing the output waveform of the conventional magnetostrictive vibration device when the vibration frequency signal of the vibrator and the sound frequency signal are inputted to the drive coil, and the output waveform of the magnetostrictive multiple vibration device in FIG. Shown graph (B) A graph (A) showing an output waveform of the conventional magnetostrictive vibration device when a predetermined signal and a signal obtained by delaying the predetermined signal are input to the drive coil, and an output of the magnetostrictive multiple vibration device in FIG. Graph showing waveform (B) Schematic side sectional view of a magnetostrictive multiple vibration device according to Embodiment 2 of the present invention Schematic side sectional view of a magnetostrictive multiple vibration device according to Embodiment 3 of the present invention Schematic side sectional view of a magnetostrictive multiple vibration device according to Embodiment 4 of the present invention Partially cut perspective view of a conventional vibration device

Explanation of symbols

L1, L2, L3 ... Shaft length R1, R2, R3 ... Shaft diameter 1 ... Vibrating device 2 ... Vibrating body 3 ... Coil 4 ... Magnet 5 ... Vibrator 6 ... Collision part 10, 30, 50, 70 ... Magnetostrictive multiple vibration device 12, 32, 58, 78 ... Mass members 14, 34, 54, 74 ... Giant magnetostrictive rods 16A, 16B ... Drive coil 18 ... Vibrated body 20A, 20B, 20C, 40A, 40B, 52A, 52B, 52C,
72A, 72B, 72C ... Giant magnetostrictive member 22A, 22B, 22C, 42A, 42B, 42C ... Bias magnet 36 ... Bolt 38A, 38B ... Nut 56A, 76A ... Low frequency drive coil 56B, 76B ... Medium frequency drive coil 56C, 76C ... High frequency drive coil

Claims (11)

  A substantially rod-shaped magnetostrictive rod having a magnetostrictive member, one end of which is fixed to the mass member, and a plurality of the magnetostrictive rods arranged side by side along the magnetostrictive rod so as to surround the outer periphery of the magnetostrictive member. A magnetostrictive multiple vibration device characterized in that the magnetostrictive rod is capable of multiple vibrations at a plurality of types of frequencies by simultaneously driving the drive coils at different frequencies. In claim 1,
A magnetostrictive multiple vibration device, wherein at least a vibration frequency signal and a sound frequency sound signal are input to the plurality of drive coils. In claim 1,
A magnetostrictive multiple vibration device characterized in that at least a predetermined signal and a signal having an opposite phase to the predetermined signal are input to the plurality of drive coils. In claim 1,
A magnetostrictive multiple vibration device characterized in that at least a predetermined signal and a signal obtained by delaying the predetermined signal are input to the plurality of drive coils. In any one of Claims 1 thru | or 4,
The magnetostrictive rod is configured by stacking a plurality of the magnetostrictive members in the axial direction, and the plurality of magnetostrictive members are arranged in ascending order of the driving frequency of the magnetostrictive member from the mass member side. Vibration device. In any one of Claims 1 thru | or 5,
The magnetostrictive rod is configured by stacking a plurality of magnetostrictive members having different axial lengths in the axial direction, and the axial length of the plurality of magnetostrictive members is shortened in ascending order of the driving frequency of the magnetostrictive members. A magnetostrictive multiple vibration device characterized by the above. In any one of Claims 1 thru | or 6.
The magnetostrictive rod is configured by stacking a plurality of magnetostrictive members having different shaft diameters in the axial direction, and the shaft diameters of the plurality of magnetostrictive members are reduced in ascending order of the driving frequency of the magnetostrictive members. A magnetostrictive multiple vibration device characterized by that. In any one of Claims 1 thru | or 7,
2. A magnetostrictive multiple vibration device according to claim 1, wherein bias magnets for applying a bias magnetic field in the axial direction of the magnetostrictive member are disposed at both axial ends of the magnetostrictive member. In any one of Claims 1 thru | or 8.
The magnetostrictive multiple vibration device according to claim 1, wherein the magnetostrictive rod is formed in a substantially cylindrical shape. In any one of Claims 1 thru | or 9,
A magnetostrictive multiple vibration device, wherein a preload is applied in an axial direction of the magnetostrictive rod. In any one of Claims 1 thru | or 10.
The magnetostrictive multi-vibration device, wherein the magnetostrictive member is a giant magnetostrictive member made of a giant magnetostrictive element.

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