JP2015044165A - Vibration electric conversion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration electric conversion device capable of reducing a size and cost, by efficiently generating vibration or an electric signal.SOLUTION: The vibration electric conversion device 100 comprises a magnetostriction rod 102 for mutually converting mechanical strain by vibration and a magnetic flux change by the magnetostriction effect, a coil 103 wound on the magnetostriction rod 102, joining yokes 104a and 104b joined to respective both ends of the magnetostriction rod 102 and permanent magnets 105a and 105b for forming a magnetic flux loop of passing through the magnetostriction rod 102, and the joining yokes 104a and 104b are joined to a vibration medium part 10 for imparting vibration to the magnetostriction rod 102, and a parallel beam is constituted of the magnetostriction rod 102 and the vibration medium part 10.

Description

  The present invention relates to a vibroelectric conversion device, and more particularly to a vibroelectric conversion device using a magnetostrictive material.

  Conventionally, techniques using familiar vibrations have been actively developed. As one of the techniques, a power generation method using a piezoelectric element and a power generation method using a change in magnetic flux of a permanent magnet are known.

  A magnetostrictive power generation device is known as a power generation method using a change in magnetic flux of a permanent magnet (see, for example, Patent Document 1).

  Patent Document 1 discloses a vibration power generation device that can generate power by vibration using the magnetostriction effect. This vibration power generation device includes a giant magnetostrictive member that expands and contracts by being strained by the movement of a weight, permanent magnets disposed at both ends of the giant magnetostrictive member, and a coil wound around the giant magnetostrictive member. The giant magnetostrictive member generates a bias magnetic flux in the longitudinal direction in a beam-like configuration with a permanent magnet, and the bias magnetic flux changes as the giant magnetostrictive member expands and contracts. Thereby, an electromotive force is generated in the coil wound around the giant magnetostrictive member.

Japanese Patent Laid-Open No. 09-90065

  Conventional vibration power generation devices (for example, permanent magnet movable type, electret, bimorph piezoelectric element) generate power in a cantilever state. In such a configuration, when the frequency of the vibrating medium and the resonant frequency of the vibration power generation device do not match, the amount of power generation is greatly reduced.

  In addition, when a magnetostrictive vibration power generation device using the magnetostriction effect due to bending of the magnetostrictive rod is attached to a vibrating medium and used as a generator or an actuator, a magnetic body (magnetic rod) provided in parallel with the magnetostrictive rod is: It becomes a resistance (deformation resistance) when the magnetostrictive rod is deformed. For this reason, in a magnetostrictive vibration power generation device attached to a vibrating medium, it is difficult to efficiently generate vibration from a given electric signal or to generate power from vibration.

  Further, in the conventional permanent magnet movable type vibration device, in order to efficiently generate an electric signal from given vibration, it is necessary to increase the size of the permanent magnet provided in these vibration power generation devices. Even in the magnetostrictive vibration power generation device, it is necessary to consider the balance between the volume of the magnetostrictive rod and the bias magnetic flux, but it is effective to increase the size of the permanent magnet. However, when the size of the permanent magnet is increased, the size of the vibration power generation device is increased and the cost is increased.

  In view of the above problems, an object of the present invention is to provide a vibroelectric conversion device that can efficiently generate vibrations or electrical signals, and can achieve downsizing and cost reduction.

  In order to solve the above problems, a vibroelectric conversion device according to an aspect of the present invention includes a magnetostrictive rod that mutually converts mechanical strain and magnetic flux change due to vibration by a magnetostrictive effect, and the magnetostrictive rod wound around the magnetostrictive rod. A coil, a joining yoke joined to each of both ends of the magnetostrictive rod, and a permanent magnet for forming a magnetic flux loop passing through the magnetostrictive rod, and the joining yoke provides vibration to the magnetostrictive rod The magnetostrictive rod and the vibration medium part constitute a parallel beam.

  According to this configuration, the leakage magnetic circuit sufficiently forms a magnetic path (flux loop) necessary for mutual conversion between vibration and electric signal, and is equivalent to the voltage value obtained by a conventional vibration electric conversion device. Can be obtained. Further, according to the vibroelectric conversion device, since the magnetic rod is not provided, the deformation resistance of the magnetostrictive rod can be reduced, and the force required to bend the magnetostrictive rod can be reduced. Therefore, according to the oscillating electrical conversion device, it is possible to efficiently generate vibrations or electrical signals.

  In addition, since the vibroelectric conversion device can be retrofitted, the functions of power generation and actuator can be added to the existing vibrator.

  The aspect ratio of the magnetostrictive rod may be 20 or more and 40 or less.

  According to this configuration, it is possible to efficiently generate vibrations or electrical signals using the leakage magnetic path.

  Moreover, it is good also as having the back yoke arrange | positioned in parallel with the said magnetostriction stick | rod, and one part connected to the said permanent magnet.

  According to this configuration, the bias magnetic flux forms a closed magnetic path that passes through the back yoke, and is less likely to leak out to the outside, that is, the magnetostrictive rod or the magnetic rod. In addition, by providing a back yoke, a bias magnetic flux is generated with a small magnet and an appropriate magnetostriction constant is given, so that a change in magnetic flux due to stress or a magnetic field is increased, and an electric signal (or vibration) is efficiently generated, Miniaturization and cost reduction can be realized.

  The vibration medium unit may be a nonmagnetic material.

  According to this configuration, the size of the permanent magnet for generating the bias magnetic flux can be reduced to at least half that of the conventional magnet. Therefore, it is possible to reduce the size and cost of the vibroelectric conversion device.

  In addition, a nonmagnetic layer may be provided between the joining yoke and the vibration medium portion.

  According to this configuration, even if the oscillating electrical conversion device is provided on the oscillating medium unit made of a magnetic material, the magnetostrictive rod is long because the oscillating electrical conversion device and the oscillating medium unit are separated from each other. The reduction of the bias flux passing in the direction is small. The oscillating electrical conversion device efficiently generates an electrical signal (or vibration) due to a change in the leakage magnetic flux, and can realize downsizing and cost reduction of the oscillating electrical conversion device.

  Further, the joining yoke may be formed in a tapered shape so that the height decreases from one end where the magnetostrictive rod is joined to the other end where the magnetostrictive rod is not joined.

  According to this configuration, one end of the joining yoke where the magnetostrictive rod is not disposed is deformed along with the deformation of the vibration medium portion. Therefore, it is possible to suppress the joining yoke from peeling from the vibration medium portion.

  The joint yoke is disposed below the magnetostrictive rod and disposed on the magnetostrictive rod disposed on the lower joint yoke and the lower joint yoke disposed on the vibration medium portion, An upper joint yoke that fixes the magnetostrictive rod between the lower joint yoke and at least one of the lower joint yoke and the upper joint yoke has a recess for fitting the magnetostrictive rod. Also good.

  According to this configuration, the upper and lower surfaces of the magnetostrictive rod are firmly fixed by being sandwiched between the lower joint yoke and the upper joint yoke. Therefore, it is possible to suppress the magnetostrictive rod from coming off the joining yoke. Further, the joining yoke can be easily formed by press working.

  Further, the joining yoke may be covered with a peeling prevention cover for preventing the joining yoke from peeling from the vibration medium portion.

  According to this configuration, it is possible to efficiently convert the vibration and the electric signal by suppressing the joining yoke from being separated from the vibration medium portion.

  The magnetostrictive rod may be disposed at a position shifted from a neutral axis when the vibration medium portion is curved.

  According to this configuration, it is possible to generate vibration or generate power not only in the X direction but also in the Y direction.

  Further, two oscillating electrical conversion devices having the above characteristics may be arranged in parallel.

  According to this configuration, a closed magnetic path is configured by the magnetostrictive rods, the permanent magnets, and the pole pieces of the two oscillating electric devices. Therefore, leakage of the bias magnetic flux to the outside of the oscillating electrical conversion device can be suppressed. Further, when the two oscillating electrical conversion devices include a back yoke, the back yoke can be firmly fixed.

  ADVANTAGE OF THE INVENTION According to this invention, the vibration electrical conversion device which can generate | occur | produce a vibration or an electrical signal efficiently, and can implement | achieve size reduction and cost reduction can be provided.

1 is a schematic diagram illustrating a configuration of a vibroelectric conversion device according to a first embodiment. It is a photograph which shows the external appearance of a vibroelectric conversion device. It is the schematic which shows the magnetic path in a vibroelectric conversion device. It is a figure which shows the structure at the time of the measurement of the generated voltage at the time of free vibration. It is a figure which shows the bending of the aluminum material by the free vibration in the vibroelectric conversion device which concerns on Embodiment 1. FIG. It is a figure which shows the voltage which generate | occur | produces by the free vibration in the oscillating electricity conversion device which concerns on Embodiment 1. FIG. It is a figure which shows the bending of the aluminum material by the free vibration in the conventional vibroelectric conversion device. It is a figure which shows the voltage which generate | occur | produces by the free vibration in the conventional vibroelectric conversion device. FIG. 6 is a schematic diagram illustrating a configuration of a vibroelectric conversion device according to a first modification of the first embodiment. FIG. 5B is a cross-sectional view of the vibroelectric conversion device taken along the line AA ′ of FIG. 5A. It is the figure which has arrange | positioned the vibroelectric conversion device shown to FIG. 5A in the vibration medium part. It is a figure which shows the magnetic path of the bias magnetic flux of the oscillating electricity conversion device shown to FIG. 5A. It is a figure which shows the magnetic path of the magnetization change by the vibration of the vibroelectric conversion device shown to FIG. 5A. 6 is a schematic diagram illustrating a configuration of a vibroelectric conversion device according to a second modification of the first embodiment. FIG. 6 is a schematic diagram illustrating a configuration of a vibroelectric conversion device according to Embodiment 2. FIG. FIG. 10B is a cross-sectional view of the vibroelectric conversion device taken along line AA ′ of FIG. 10A. It is the schematic which shows the structure of the joining yoke of the oscillating electricity conversion device in FIG. 10A. 6 is a schematic diagram illustrating a configuration of a vibroelectric conversion device according to a first modification of the second embodiment. FIG. FIG. 11B is a cross-sectional view of the vibroelectric conversion device taken along line AA ′ of FIG. 11A. 6 is a schematic diagram illustrating a configuration of a vibroelectric conversion device according to a second modification of the second embodiment. FIG. It is sectional drawing of the oscillating electricity conversion device in the AA 'line of FIG. 12A. 6 is a schematic diagram illustrating a configuration of a vibroelectric conversion device according to a third modification of the second embodiment. FIG. 6 is a schematic diagram illustrating a configuration of a vibroelectric conversion device according to a third modification of the second embodiment. FIG. It is the schematic which shows an example of the vibration medium part and arrangement | positioning of a vibroelectric conversion device. It is the schematic which shows the other example of the vibration medium part and arrangement | positioning of a vibroelectric conversion device. It is the schematic which shows the other example of the vibration medium part and arrangement | positioning of a vibroelectric conversion device. It is the schematic which shows the other example of the vibration medium part and arrangement | positioning of a vibroelectric conversion device. It is the schematic which shows the other example of the vibration medium part and arrangement | positioning of a vibroelectric conversion device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, constituent elements, arrangement positions and connecting forms of constituent elements, processes, order of processes, and the like shown in the following embodiments are merely examples and do not limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment 1)
Hereinafter, the configuration of the oscillating electrical conversion device according to Embodiment 1 of the present invention will be described with reference to FIGS. 1A to 1C. FIG. 1A is a schematic diagram showing the configuration of the oscillating electrical conversion device according to the present embodiment, FIG. 1B is a photograph showing the appearance of the oscillating electrical conversion device, and FIG. 1C is a schematic diagram showing a magnetic path in the oscillating electrical conversion device. It is.

  As shown in FIG. 1A, a vibroelectric conversion device 100 includes a magnetostrictive rod 102 having a long shape, a coil 103 wound around the magnetostrictive rod 102, and a junction yoke in which both sides of the magnetostrictive rod 102 are connected. 104a and 104b, and permanent magnets 105a and 105b disposed on the joining yokes 104a and 104b, respectively.

  Further, as shown in FIG. 1B, the vibroelectric conversion device 100 is disposed on the vibration medium unit 10.

  The vibration medium unit 10 is made of a nonmagnetic material, and is formed in an arbitrary shape such as a flat plate, a rectangular parallelepiped, or a cylinder. The vibration medium unit 10 has a plane on which the joining yokes 104a and 104b are joined, and has an appropriate rigidity. The moderate rigidity is a rigidity that does not have a neutral axis (an axis at which stress becomes zero) at the time of bending in the magnetostrictive rod 102. As a result, when the vibration medium portion 10 is curved, the stress inside the magnetostrictive rod 102 is uniformly pulled or compressed, and a uniform magnetization change occurs.

  As the material of the vibration medium part 10 satisfying this condition, nonmagnetic materials such as aluminum, nonmagnetic stainless steel, phosphor bronze, glass, and acrylic can be selected.

  As an example, the vibration medium unit 10 shown in FIG. 1B is made of an aluminum material. Thereby, the vibrating medium unit 10 and the magnetostrictive rod 102 constitute a parallel beam. Vibration is transmitted to the oscillating electrical conversion device 100 via the oscillating medium unit 10, and the magnetic flux changes in the oscillating electrical conversion device 100 due to expansion and contraction of the magnetostrictive rod 102 with respect to the oscillating medium unit 10. The change in the magnetic flux at this time will be described in detail later.

  The oscillating electricity conversion device 100 may further include a back yoke. The vibroelectric conversion device including the back yoke will be described in detail later.

The magnetostrictive rod 102 is made of, for example, Galfenol (Fe _81.4 Ga _18.6 ), which is one of Fe-Ga alloys, which are magnetostrictive materials, and mechanical distortion and magnetic flux change due to vibration are mutually caused by the magnetostrictive effect. Convert. The magnetostrictive rod 102 has, for example, a rectangular parallelepiped rod shape of 2 × 0.5 × 22 mm ³ .

  A copper wire is wound around the magnetostrictive rod 102 to form a coil 103. In the coil, for example, a copper wire having a wire diameter of 0.05 mm is wound around the magnetostrictive rod 102 1800 times, the layer thickness is 0.5 mm, and the resistance is 110Ω.

  The joining yokes 104a and 104b are made of, for example, SS400 that is soft magnetic steel. The lower surfaces of the joining yokes 104a and 104b are flat, and are firmly joined to the vibration medium portion 10 on which the joining yokes 104a and 104b are disposed by welding or an adhesive.

  Further, the joining yokes 104a and 104b are formed at such a height that a gap can be provided so that the coil 103 and the vibration medium unit 10 do not contact each other. Further, the joint yokes 104a and 104b are formed so as to have a sufficient joint area where the joint surface with the vibration medium unit 10 is not peeled off by a shearing force due to bending.

  A groove for fitting the magnetostrictive rod 102 is formed at one end of each of the joining yokes 104a and 104b. The groove is formed in accordance with the shape of both ends of the magnetostrictive rod 102. Both ends of the magnetostrictive rod 102 are fitted in the grooves of the joining yokes 104a and 104b, respectively, and are firmly joined by welding or an adhesive.

  The permanent magnets 105a and 105b are composed of Nd—Fe—B magnets, for example. Permanent magnet 105a is arranged so that the side in contact with joining yoke 104a is the N pole and the side not in contact with joining yoke 104a is the S pole. Further, the permanent magnet 105b is arranged so that the side in contact with the joining yoke 104b is the S pole and the side not in contact with the joining yoke 104b is the N pole. By providing the permanent magnets 105a and 105b in this way, the unidirectional and uniform bias magnetic flux passes through the magnetostrictive rod 102.

  As shown in FIG. 1A, the permanent magnets 105a and 105b may be disposed on the upper surfaces of the joining yokes 104a and 104b, or may be disposed on the side surfaces of the joining yokes 104a and 104b. Further, the oscillating electrical conversion device 100 may be provided with a pole piece or a back yoke for efficiently extracting the magnetic flux from the permanent magnets 105a and 105b.

  Here, the magnetic flux in the oscillating electrical conversion device 100 will be described.

  The magnetic flux in the vibroelectric conversion device 100 is composed of a bias magnetic flux passing through the magnetostrictive rod 102 and a leakage magnetic flux returning from the side surface of the magnetostrictive rod 102 to the side surface of the magnetostrictive rod 102 through the air.

  That is, in addition to the magnetic path of the bias magnetic flux penetrating the magnetostrictive rod 102 in the major axis direction, as shown in FIG. 1C, a leakage magnetic path is formed that returns from the side surface of the magnetostrictive rod 102 to the side surface of the magnetostrictive rod 102 through the air. . Since a closed loop passing through the permanent magnets 105a and 105b having a large magnetic resistance is unlikely to occur, a change in magnetization due to the inverse magnetostriction effect at the time of bending of the magnetostrictive rod 102 occurs in the closed magnetic path due to this leakage magnetic path. Therefore, even if there is no magnetic bar which forms a closed magnetic circuit for the oscillating electrical conversion device, the oscillating electrical conversion device 100 can operate.

  Further, by applying a uniform stress during bending, the magnetization change of the magnetostrictive rod 102 due to the inverse magnetostrictive effect becomes uniform. In the Fe—Ga alloy or the Fe—Ga—Al alloy used as the magnetostrictive rod 102, the non-magnetic permeability is as low as about 50 or more and 200 or less, so that leakage flux is likely to occur.

  In addition, it is preferable that the magnetostrictive rod 102 is elongated as compared with a conventional oscillating electric conversion device including a magnetic rod. For example, an aspect ratio that is a ratio of the length (the longest side of the rectangular parallelepiped rod-shaped shapes) to the thickness of the magnetostrictive rod 102 (the shortest side of the rectangular parallelepiped rod-shaped shapes) is used efficiently. You may set to 20 or more and 40 or less which is a possible range. Thereby, the oscillating electricity conversion device 100 can generate a vibration or an electric signal efficiently using a leakage magnetic path efficiently.

  Here, the effect of the oscillating electrical conversion device 100 will be described. Below, the result of having performed the comparative experiment of the oscillating electricity conversion device 100 and the conventional oscillating electricity conversion device is shown. FIG. 2 is a diagram illustrating a configuration of the oscillating electrical conversion device 100 in which this experiment was performed.

  As shown in FIG. 2, the oscillating electricity conversion device 100 used in this experiment uses Galfenol having a width of 2 mm, a thickness of 0.5 mm, and a length of 22 mm as the magnetostrictive rod 102. The aspect ratio of the magnetostrictive rod 102 is 16 / 0.5 = 32, which satisfies the above-described conditions for efficiently using the leakage magnetic path.

  The magnetostrictive rod 102 is provided with a copper wire having a wire diameter of 0.05 mm, 1800 turns, a layer thickness of 0.5 mm, and a resistance of 110Ω as the coil 103. The coil 103 is connected to a voltmeter 120 generated by the coil due to the bending of the magnetostrictive rod 102.

  In addition, the oscillating electrical conversion device 100 includes joint yokes 104 a and 104 b at both ends of the magnetostrictive rod 102. The joining yokes 104 a and 104 b are joined to the main surface of the vibration medium unit 10.

Moreover, the oscillating electrical conversion device 100 includes permanent magnets 105a and 105b made of Nd—Fe—B having a volume of 2 × 3 × 1 mm ³ on the joining yokes 104a and 104b. The permanent magnets 105a and 105b are permanent magnets of such a size that an optimum bias magnetic flux is added when an optimum bias magnetic flux is added when the largest voltage is generated.

  The vibration medium unit 10 is made of an aluminum material having a width of 10 mm, a thickness of 2 mm, and a length of 120 mm. The main surface of the vibration medium unit 10 and the magnetostrictive rod 102 constitute a parallel beam. The vibration medium unit 10 has, for example, a so-called cantilever structure in which one end is fixed and the other end can freely vibrate. By vibrating the other end of the vibration medium unit 10, the vibration medium unit 10 freely vibrates.

  A strain gauge 130 for measuring the amount of deflection of the vibration medium unit 10 is provided on the surface opposite to the main surface of the vibration medium unit 10.

  Further, the conventional vibroelectric conversion device includes a magnetostrictive rod similar to the magnetostrictive rod 102 of the above-described vibroelectric conversion device 100 and a magnetic rod made of SUS430 having a thickness of 0.5 mm. In a conventional oscillating electrical conversion device, a magnetostrictive rod and a magnetic rod constitute a parallel beam.

In the conventional oscillating electrical conversion device, a permanent magnet made of Nd—Fe—B having a volume of 2 × 3 × 2 mm ³ is arranged on a junction yoke (not shown). This permanent magnet is a permanent magnet having such a size that an optimum bias magnetic flux is added when an optimum bias magnetic flux is added when the largest voltage is generated. The permanent magnet in the conventional vibroelectric conversion device has a volume twice that of the permanent magnets 105 a and 105 b arranged in the vibroelectric conversion device 100.

  Further, in the conventional vibroelectric conversion device, the magnetic bar is arranged on the aluminum material side at the same position as the position where the vibroelectric conversion device 100 is arranged on the main surface of the aluminum material similar to that of the vibration medium portion 10 described above. Are joined together. In the vibronic electrical conversion device 100, the neutral axis during bending (the axis at which stress is zero) is in the aluminum material.

  Furthermore, in the aluminum material, a strain gauge for measuring the amount of deflection of the aluminum material is provided on the surface opposite to the main surface to which the oscillating electrical conversion device is bonded.

  In each of the vibroelectric conversion device 100 having the above-described configuration and the conventional vibroelectric conversion device, one end of the aluminum material (vibration medium portion 10) is fixed and cantilevered, and the same initial strain is applied to the other end of the aluminum material. The amount of distortion of the aluminum material and the voltage generated in the oscillating electrical conversion device when it was bent and flipped freely were measured.

  FIG. 3A is a diagram illustrating bending of an aluminum material due to free vibration in the oscillating electricity conversion device 100, and FIG. 3B is a diagram illustrating voltage generated by the free vibration in the oscillating electricity conversion device 100. FIG. 4A is a diagram showing bending of an aluminum material due to free vibration in a conventional oscillating / electrical conversion device, and FIG. 4B is a diagram showing voltage generated by free vibration in the conventional oscillating / electrical conversion device.

  As shown in FIG. 3A and FIG. 4A, the maximum distortion of about 350 ppm is generated in both the oscillating electricity conversion device 100 and the conventional oscillating electricity conversion device. Further, as shown in FIGS. 3B and 4B, a voltage of about 1 V is generated. It can be seen that the voltage value generated in the oscillating electricity conversion device 100 is slightly larger than the voltage value generated in the conventional oscillating electricity conversion device, and the vibration continues longer.

  As described above, the oscillating electricity conversion device 100 does not have a magnetic rod as compared with the conventional oscillating electricity conversion device, but the leakage magnetic circuit has a magnetic path necessary for mutually converting the vibration and the electric signal. Since it is formed sufficiently, it is considered that a voltage value equivalent to the voltage value obtained with the conventional oscillating electrical conversion device could be obtained.

  Moreover, in the oscillating electricity conversion device 100, it has been confirmed that the size of the permanent magnet for generating the bias magnetic flux can be reduced to at least half that of the conventional one.

  Furthermore, it can be said that in the oscillating electrical conversion device 100, since the magnetic rod is not provided, the deformation resistance is reduced, and the force required to bend the magnetostrictive rod can be reduced.

  Further, in each of the oscillating / electrical conversion device 100 and the conventional oscillating / electrical conversion device, the magnitude of vibration generated when a current is passed through the coil and used as an actuator was compared.

  As a comparison method, a sinusoidal AC voltage having a frequency of 100 Hz and an amplitude of ± 10 V was applied to each coil of the oscillating electricity conversion device 100 and the conventional oscillating electricity conversion device by an oscillator having an output resistance of 50Ω. And the bending amount of the aluminum material (vibration medium part 10) was measured with the strain gauge.

As a result, vibration with an amplitude of 25 ppm occurs in the oscillating electricity conversion device 100, and vibration with an amplitude of 24 ppm occurs in the conventional oscillating electricity conversion device. The volume of the permanent magnet at this time, in the vibration electric conversion device 100 2 × ³ × 1mm 3, a 2 × ³ × 2mm 3 in conventional oscillating electric conversion device. That is, the permanent magnet in the conventional oscillating electricity conversion device has a volume twice that of the permanent magnets 105 a and 105 b arranged in the oscillating electricity conversion device 100.

  As described above, the oscillating electricity conversion device 100 has a configuration that does not include a magnetic rod, but is equivalent to a conventional oscillating and electrical conversion device that includes a magnetic rod and forms a magnetic circuit with a magnetic rod, a magnetostrictive rod, and a permanent magnet. It has been found that the vibration medium unit 10 (aluminum material) can be vibrated with high sensitivity (efficiency).

  From the above, according to the oscillating electrical conversion device 100 according to the present embodiment, the leakage magnetic circuit sufficiently forms a magnetic path (flux loop) necessary for mutually converting vibration and electrical signals. A voltage value equivalent to the voltage value obtained by the vibroelectric conversion device can be obtained. In addition, according to the oscillating electrical conversion device 100 according to the present embodiment, since the magnetic rod is not provided, the deformation resistance of the magnetostrictive rod can be reduced, and the force required to bend the magnetostrictive rod is reduced. be able to. Therefore, according to the oscillating electrical conversion device 100 according to the present embodiment, it is possible to efficiently generate vibrations or electrical signals.

  Further, according to the oscillating electrical conversion device 100 according to the present embodiment, the size of the permanent magnet for generating the bias magnetic flux can be reduced to at least half of that of the conventional one, so that downsizing and cost reduction are realized. can do.

  As an advantage over the prior art when the oscillating electricity conversion device according to the present embodiment is used for oscillating power generation, the oscillating electricity conversion device is integrated with the oscillating electricity conversion device so that the oscillating electricity conversion device is integrated with the oscillating electricity conversion device. There exists a point which comprises a device and can generate electric power by deformation | transformation of a vibration medium part.

  That is, a conventional vibration power generation device (for example, a permanent magnet movable type, an electret, a bimorph piezoelectric element) generates power in a cantilever state. In such a configuration, power generation is performed with high efficiency when the frequency of vibration of the vibration medium unit matches the resonance frequency of the vibration power generation device. However, when the frequency of the vibration medium unit and the resonance frequency of the vibration power generation device do not match, the power generation amount is significantly reduced. Therefore, it is necessary to have an active function of adjusting the resonance frequency of the vibration power generation device in advance or causing the resonance frequency of the vibration power generation device to follow this when the frequency of the vibration medium portion changes.

  On the other hand, when the oscillating electrical conversion device according to the present embodiment is used, the vibrating medium (vibrating medium unit) and the oscillating electrical conversion device are integrally configured as a vibration power generation device. That is, the magnetostrictive rod and the vibration medium portion of the vibroelectric conversion device constitute a parallel beam. In such a configuration, if the vibration medium portion vibrates, the magnetostrictive rod is bent with the same displacement as the displacement of the vibration medium portion in synchronism with this, and power generation is performed. Therefore, it is not necessary to consider the coincidence and follow-up of the resonance frequency as in the prior art.

  As described above, according to the vibration-electric conversion device according to the present embodiment, if the vibration medium unit in which the vibration-electric conversion device is arranged vibrates, the vibration-electric conversion device and the vibration medium unit are integrated into a vibration power generation device. It is possible to configure and reliably generate power.

(Modification 1 of Embodiment 1)
Next, Modification 1 of the present embodiment will be described with reference to FIGS. 5A to 8.

  The vibroelectric conversion device 150 according to this modification is different from the vibroelectric conversion device 100 according to the first embodiment described above in that the back yoke is arranged in parallel with the magnetostrictive rod 102 and partially connected to a permanent magnet. It is a point provided with.

  FIG. 5A is a schematic diagram illustrating a configuration of the oscillating electricity conversion device 150 according to the present modification. FIG. 5B is a cross-sectional view of the vibroelectric conversion device taken along line AA ′ of FIG. 5A. FIG. 6 is a diagram in which the vibroelectric conversion device shown in FIG. 5A is arranged in the vibration medium section. FIG. 7 is a diagram showing a magnetic path of a bias magnetic flux of the oscillating electricity conversion device shown in FIG. 5A. FIG. 8 is a diagram showing a magnetic path of magnetization change due to vibration of the oscillating electrical conversion device shown in FIG. 5A.

  As shown in FIGS. 5A and 5B, the oscillating electrical conversion device 150 according to this modification includes a back yoke 160a having one end connected to the permanent magnet 105a and the other end opened. Similarly, the vibroelectric conversion device 150 includes a back yoke 160b having one end connected to the permanent magnet 105b and the other end open. The other end of the back yoke 160a and the other end of the back yoke 160b are arranged to face each other with a predetermined gap. The back yokes 160a and 160b are connected to the permanent magnets 105a and 105b by magnetic force, respectively.

  As shown in FIG. 6, the lower surfaces of the joining yokes 104a and 104b of the oscillating electrical conversion device 150 are joined to the main surface of the vibration medium unit 10 made of a nonmagnetic material (for example, aluminum, SUS304, etc.). Yes. In addition, a predetermined gap is provided between the coil 103 and the vibration medium unit 10. At this time, the vibroelectric conversion device 150 and the vibration medium unit 10 are integrated, and the neutral axis during bending (the axis at which stress becomes zero) is in the vibration medium unit 10.

  Here, as shown in FIG. 7, the vibroelectric conversion device 150 has a bias magnetic flux passing through the permanent magnet 105 a, the magnetostrictive rod 102, the permanent magnet 105 b, the back yoke 160 b, and the back yoke 160 a. Similarly to the above-described oscillating electrical conversion device 100, as shown in FIG. 8, there is also a leakage magnetic flux that passes through the air from the side surface of the magnetostrictive rod 102 and returns to the side surface of the magnetostrictive rod 102.

  Generally, it is not preferable that the bias magnetic flux of the permanent magnet forms a leakage magnetic path outside the outside, that is, the magnetostrictive rod or the magnetic rod, like a permanent magnet composed of Nd-Fe-B. This is because the adjusted bias magnetic flux changes, for example, when a magnetic material approaches in the external world, or changes due to influence from a medium such as an electronic device or magnetic recording. By providing the back yokes 160a and 160b as shown in FIG. 7, the bias magnetic flux forms a closed magnetic path that passes through the back yoke and is less likely to leak to the outside.

  In addition, since a slight gap is provided between the back yoke 160a and the back yoke 160b, the back yokes 160a and 160b do not affect the deformation of the oscillating electrical conversion device 150. However, since the back yokes 160a and 160b are cantilever beams having one ends fixed to the permanent magnets 105a and 105b, respectively, the back yokes 160a and 160b may be detached when an excessive force is applied to the other end.

  Therefore, the oscillating electrical conversion device 150 can operate without a magnetic bar constituting a closed magnetic circuit. Further, by providing the back yokes 160a and 160, it is possible to suppress the leakage magnetic flux from leaking to the outside. Further, by providing the back yokes 160a and 160b, a bias magnetic flux is generated by a smaller permanent magnet and a change in the magnetic flux is increased, so that an electric signal (or vibration) is efficiently generated, thereby reducing the size and reducing the cost. Can be realized.

(Modification 2 of Embodiment 1)
In the first embodiment and the first modification described above, the vibration-electric conversion devices 100 and 150 are provided on the main surface of the vibration medium unit 10 made of, for example, an aluminum material that is a non-magnetic material. The part 10 may be made of a magnetic material. FIG. 9 shows a configuration of the oscillating electrical conversion device 170 according to this modification.

  The difference between the vibroelectric conversion device 170 according to the present modification and the vibroelectric conversion device 100 according to Embodiment 1 is that the vibroelectric conversion device 170 according to the first embodiment is provided on the main surface of the vibration medium unit 190 made of a magnetic material.

  As shown in FIG. 9, the oscillating electrical conversion device 170 is joined to the main surface of the oscillating medium unit 190 made of a magnetic material. At this time, the nonmagnetic layers 180a and 180b are disposed on the lower surfaces of the bonding yokes 104a and 104b. As the nonmagnetic layer, aluminum, nonmagnetic stainless steel or the like can be selected. For example, in the oscillating electrical conversion device 170 shown in FIG. 9, the nonmagnetic layers 180a and 180b are made of an aluminum material.

  As a result, even if the oscillating electrical conversion device 170 is provided on the oscillating medium unit 190 made of a magnetic material, the magnetostrictive rod 102 is removed because the oscillating electrical conversion device 170 and the oscillating medium unit 190 are separated from each other. The influence of the bias magnetic flux passing in the longitudinal direction is reduced. The oscillating electrical conversion device 170 can efficiently generate an electrical signal (or vibration) due to a change in the leakage magnetic flux, and can realize downsizing and cost reduction of the oscillating electrical conversion device 170.

(Embodiment 2)
Next, Embodiment 2 will be described with reference to FIGS. 10A and 10B.

  The difference between the vibroelectric conversion device 200 according to the present embodiment and the vibroelectric conversion device 100 according to the first embodiment is that the joining yoke is formed in a tapered shape.

  FIG. 10A is a schematic diagram showing the configuration of the oscillating electricity conversion device 200 according to the present embodiment. FIG. 10B is a cross-sectional view of the vibroelectric conversion device 200 taken along the line AA ′ of FIG. 10A. FIG. 10C is a schematic diagram illustrating an example of the configuration of the junction yokes 204a and 204b of the oscillating electrical conversion device 200 in FIG. 10A.

  As shown in FIGS. 10A and 10B, the oscillating and electrical conversion device 200 according to the present embodiment is similar to the oscillating and electrical conversion device 100 according to Embodiment 1 in that the magnetostrictive rod 202 has a long shape, and the magnetostrictive rod. 202, coil 203 wound around 202, joining yokes 204a and 204b to which both sides of magnetostrictive rod 202 are connected, and permanent magnets 205a and 205b disposed on joining yokes 204a and 204b, respectively. . Furthermore, the vibroelectric conversion device 200 includes magnetic pole pieces 206a and 206b on the permanent magnets 205a and 205b, respectively.

  As shown in FIGS. 10A and 10B, the oscillating electricity conversion device 200 is disposed on the vibration medium unit 10.

  Here, as shown in FIG. 10B, the joining yoke 204b is formed in a tapered shape so that the height decreases from one end where the magnetostrictive rod 202 is joined to the other end where the magnetostrictive rod 202 is not joined. Yes.

  When the joining yokes 204a and 204b and the vibration medium unit 10 are separated, the characteristics of the oscillating electrical conversion device are greatly deteriorated. For example, in a joint yoke having a uniform height such as the joint yokes 104a and 104b of the oscillating electrical conversion device 100 shown in the first embodiment, the joint yoke is difficult to be deformed along the curvature of the vibration medium unit 10, and from the end. Peeling easily occurs. To prevent this peeling, as shown in FIG. 10B, the joining yokes 204a and 204b have a height that decreases from one end where the magnetostrictive rod 202 is disposed toward the other end where the magnetostrictive rod 202 is not joined. It is formed in a taper shape. Furthermore, it is preferable to provide a thin flat portion at the other end of the joining yokes 204a and 204b where the magnetostrictive rod 202 is not disposed.

  As a result, one end of the joining yokes 204a and 204b where the magnetostrictive rod 202 is not disposed is deformed along with the deformation of the vibration medium unit 10, so that the joining yokes 204a and 204b are prevented from being separated from the vibration medium unit 10. it can.

  In addition to the tapered configuration described above, the joining yokes 204a and 204b are formed so that the joining area with the vibration medium unit 10 is increased, that is, in the longitudinal direction of the magnetostrictive rod 202, or the magnetostrictive rod. It is preferable to increase the length in a direction (width direction) orthogonal to the long direction of 202. Thereby, it is possible to further suppress the joining yokes 204 a and 204 b from being separated from the vibration medium unit 10 by increasing the bonding area with the vibration medium unit 10.

  Further, as shown in FIG. 10C, the joining yoke 204b may be composed of a lower joining yoke 214a and an upper joining yoke 214b. The lower joint yoke 214a is formed with a recess according to the shape of the magnetostrictive rod 202, and the magnetostrictive rod 202 is fitted into the recess. Further, the upper joint yoke 214b is joined on the lower joint yoke 214a in which the magnetostrictive rod 202 is fitted. The magnetostrictive rod 202, the lower joint yoke 214a, and the upper joint yoke 214b are joined by welding or an adhesive. Accordingly, the upper and lower surfaces of the magnetostrictive rod 202 are firmly fixed with the lower joint yoke 214a and the upper joint yoke 214b interposed therebetween. Thereby, it can suppress that a magnetostriction stick | rod remove | deviates from a joining yoke. Since the junction yoke 204a has the same configuration as the junction yoke 204b, the description thereof is omitted.

  The recesses described above may be formed not only in the lower bonding yoke 214a but also in the upper bonding yoke 214b, or may be formed in both the lower bonding yoke 214a and the upper bonding yoke 214b.

  The pole pieces 206a and 206b are made of, for example, SS400 that is soft magnetic steel. By providing the magnetic pole pieces 206a and 206b on the permanent magnets 205a and 205b, respectively, it is possible to increase the generation amount of the bias magnetic flux as compared with the case where the magnetic pole pieces 206a and 206b are not provided. Therefore, by providing the pole pieces 206a and 206b, the volume of the permanent magnets 205a and 205b can be reduced.

  As described above, according to the oscillating electricity conversion device 200 according to the present embodiment, it is possible to efficiently convert vibration and electric signals by suppressing the separation of the joining yokes 204a and 204b from the vibration medium unit 10.

(Modification 1 of Embodiment 2)
Next, Modification 1 of Embodiment 2 will be described with reference to FIGS. 11A and 11B.

  The point of difference between the vibroelectric conversion device 250 according to the present modification and the vibroelectric conversion device 200 according to the second embodiment is that the vibroelectric conversion device 250 includes a peeling prevention cover for preventing peeling of the joint yoke. .

  FIG. 11A is a schematic diagram showing a configuration of a vibroelectric conversion device 250 according to this modification. FIG. 11B is a cross-sectional view of the vibroelectric conversion device 250 taken along the line AA ′ of FIG. 11A.

  As shown in FIG. 11A, the vibroelectric conversion device 250 includes peeling prevention covers 208a and 208b so as to cover the upper portions of the joining yokes 204a and 204b, respectively. The peeling prevention covers 208a and 208b are made of, for example, aluminum, plastic, resin, or the like, and press the joining yokes 204a and 204b as upper lids. Further, the peeling prevention covers 208 a and 208 b are joined to the vibration medium unit 10.

  Further, as shown in FIG. 11B, the peeling prevention covers 208a and 208b are formed sufficiently larger than the width of the joining yokes 204a and 204b.

  Thereby, it can suppress that the joining yokes 204a and 204b peel from the vibration medium part 10, and can convert a vibration and an electrical signal efficiently.

  Note that the vibroelectric conversion device 250 may include back yokes 207a and 207b as shown in FIGS. 11A and 11B. In this case, each of the back yoke 207a and the back yoke 207b has a cantilever structure in which one end is joined to the permanent magnets 205a and 205b. Further, since there is a gap between the back yoke 207a and the back yoke 207b, the back yokes 207a and 207b can vibrate, and the joining yokes 204a and 204b can be prevented from being separated from the vibration medium unit 10. .

(Modification 2 of Embodiment 2)
Next, Modification 2 of Embodiment 2 will be described with reference to FIGS. 12A and 12B.

  The difference between the oscillating / electrical conversion device according to the present modification and the oscillating / electrical conversion device 200 according to the second embodiment is that two oscillating / electrical conversion devices are arranged in parallel on the vibration medium unit 10.

  FIG. 12A is a schematic diagram illustrating a configuration of the oscillating electricity conversion device 300 according to the present modification. FIG. 12B is a cross-sectional view of the vibroelectric conversion device 300 taken along the line AA ′ of FIG. 12A.

  As shown in FIG. 12A, the oscillating electricity conversion device 300 has two oscillating electricity conversion devices 200 shown in FIG. 10A in parallel. That is, as shown in FIG. 12B, each device of the oscillating electrical conversion device 300 includes a magnetostrictive rod 302 having a long shape, a coil 303 wound around the magnetostrictive rod 302, and both sides of the magnetostrictive rod 302. The connecting yokes 304a and 304b are connected to each other, and permanent magnets 305a and 305b disposed on the connecting yokes 304a and 304b, respectively. Furthermore, each device of the vibroelectric conversion device 300 includes back yokes 307a and 307b on the permanent magnets 305a and 305b, respectively.

  Here, in the two devices constituting the vibroelectric conversion device 300, the polarities of the permanent magnets 305a and 305b are provided to be alternated in the two devices. That is, as shown in FIG. 12A, when the permanent magnet 305a of one of the two devices constituting the oscillating electrical conversion device 300 is arranged so that the N pole is on the upper side, The permanent magnet 305a is disposed so that the south pole is on the top. Similarly, when the permanent magnet 305b of one device is arranged with the south pole on top, the permanent magnet 305b of the other device is arranged with the north pole on top.

  In the two devices constituting the oscillating electricity conversion device 300, a back yoke 307a is provided on the permanent magnet 305a in common with the two devices. Similarly, in the two devices constituting the oscillating electrical conversion device 300, a back yoke 307b is provided on the permanent magnet 305b in common with the two devices.

  Accordingly, the magnetostrictive rod 302 of the two devices, the permanent magnets 305a and 305b, and the back yokes 307a and 307b constitute a closed magnetic path. Therefore, leakage of the bias magnetic flux to the outside of the oscillating electrical conversion device 300 can be suppressed.

  Also, since the back yokes 307a and 307b are provided in common to the two devices so as to connect the two devices, the back yokes 307a and 307b are similar to the back yokes 207a and 207b shown in FIGS. 11A and 11B. It does not have a cantilever structure. Therefore, since the back yokes 307a and 307b are fixed on the permanent magnets 305a and 305b, a more robust vibroelectric conversion device 300 can be provided.

(Modification 3 of Embodiment 2)
Next, Modification 1 of Embodiment 2 will be described with reference to FIGS. 13A and 13B.

  The difference between the oscillating / electrical conversion device 250 according to this modification and the oscillating / electrical conversion device 200 according to the second embodiment is that it has a simple configuration in which the joint yoke is omitted.

  FIG. 13A and FIG. 13B are schematic views illustrating the configuration of the oscillating electrical conversion device according to the present modification.

  As shown in FIG. 13A, the vibroelectric conversion device 400 includes a magnetostrictive rod 402 having a long shape, a coil 403 wound around the magnetostrictive rod 402, and a permanent magnet disposed on the magnetostrictive rod 402. 405a and 405b, and pole pieces 407a and 407b on the permanent magnets 405a and 405b, respectively.

  The vibroelectric conversion device 400 is disposed on the vibration medium unit 210. The vibration medium unit 210 has a recess at a position where the coil 403 is disposed, and both ends of the magnetostrictive rod 402 are joined to the vibration medium unit 210 on both sides of the recess. The height of the recess is formed larger than the layer thickness of the coil 403. Therefore, a gap exists between the vibration medium unit 210 and the coil 403.

  Further, both ends of the magnetostrictive rod 402 are formed in a tapered shape so that the height decreases from the side around which the coil 403 is wound toward both ends. Thereby, it is possible to suppress the magnetostrictive rod 402 from being peeled off from the vibration medium unit 210 in the vibroelectric conversion device 400.

  Note that the vibration medium section has a recess at a position where the coil 403 is disposed, and a protrusion at the portion where the magnetostrictive rod 402 is joined on both sides of the recess, as in the vibration medium section 220 shown in FIG. 13B. You may do it.

(Other embodiments)
As described above, the embodiment has been described as an example of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and implementations in which changes, replacements, additions, omissions, etc. are appropriately made. It is applicable also to the form of. Moreover, it is also possible to combine each component demonstrated in the said embodiment and it can also be set as a new embodiment.

  Thus, hereinafter, other embodiments will be described together.

  First, modified examples of the vibration medium unit for joining the vibroelectric conversion device will be described with reference to FIGS.

  14 to 18 are diagrams showing examples of the vibration medium portion of the oscillating electricity conversion device and the arrangement positions of the oscillating electricity conversion device.

  The vibration medium section may be made of, for example, aluminum, phosphor bronze, stainless steel, glass, a flat plate such as a floor, a post, a pipe, a tire rim having a curvature on the joint surface, an epoxy resin, or the like. The magnetostrictive rod and the vibration converting portion are firmly joined by welding or adhesive, etc. to form a parallel beam, so that the vibroelectric conversion device can generate power by the given vibration or generate vibration by the given electric signal. Can occur.

  For example, like the vibration medium unit 410 illustrated in FIG. 14, the vibration medium unit may be a flat plate. When vibration or impact is applied to the vibration medium unit 410, power is generated in the oscillating electrical conversion device 250 joined to the vibration medium unit 410.

  For example, the oscillating electrical conversion device 250 may generate power by vibration due to an impact when the vibration medium unit 410 is stepped on by a person or vibration due to an impact when a ball hits. By this power generation, when the vibration medium unit 410 is stepped on by a person or a ball hits, the light emitting diode can be blinked to notify.

  Further, the vibration medium unit 410 may be a glass flat plate. For example, the vibroelectric conversion device 250 may be joined to a window glass that is the vibration medium unit 410, power generation may be performed by chatter vibration of the window glass, and a signal may be transmitted using the generated power, which may be useful for crime prevention.

  Moreover, you may join the oscillating electricity conversion device 250 by using the glass plate which comprises the touch panel of a smart phone as the vibration medium part 410. FIG. If the touch panel is excited at a high frequency as the vibration medium unit 410, a pseudo tactile sensation can be presented when the touch panel is touched by the curved vibration.

  Further, a vibration plate of a percussion instrument (a drum, a drum, a cymbal, an iron koto) may be used as the vibration medium unit 410. As a result, sound is generated by impact and power can be generated by the vibration. For example, by providing a light emitting diode in a musical instrument, entertainment such as a musical instrument that shines by striking can be provided.

  Further, like the vibration medium unit 420 shown in FIG. 15, the vibration medium unit may be a corner, a round bar, or a support to which it is fixed. Thereby, the oscillating electricity conversion device 250 can generate electric power by an impact applied to the vibration medium unit 420 or an excitation force by a fluid such as wind or water.

  An example of a round bar is a cane. An example of a support post is a road sign or pole.

  In this case, in the vibroelectric conversion device 250, the magnetostrictive rod is shifted from the neutral axis during bending (the axis where stress is zero) indicated by the one-dot chain line in FIG. Thus, power generation can be performed not only by the X direction shown in FIG. 15 but also by vibrations in the Y direction.

  Further, like the vibration medium unit 430 illustrated in FIG. 16, the vibration medium unit may be a cylindrical body. In this case, it is preferable that the joint surface of the joint yoke in the oscillating electrical conversion device 250 has a shape that follows the curvature of the cylindrical body that constitutes the vibration medium portion 430.

  Alternatively, a part of the piping may be used as the vibration medium unit 430, and the vibration / electric conversion device 250 may generate power by vibration caused by the flow of fluid (water or air) to detect the presence or absence of the flow. Similarly, as the vibration medium unit 430, an automobile muffler, a bicycle frame, or a cane cylinder may be used to generate power by vibration or impact acting on the cylinder.

  In addition, as shown in FIG. 17, an annular shape such as a rim of an automobile or a bicycle tire may be used as the vibration medium unit 440. Thereby, the oscillating electricity conversion device 250 can generate electric power by the vibration of the rim during traveling. In this case, the outer shape of the joining yoke may be processed into a curved shape so that the curved rim and the joining yoke are firmly joined. The air pressure sensor and the wireless module can be operated with the generated electric power, and a battery for them is unnecessary.

  Moreover, as shown in FIG. 18, it is good also as a structure which has a vibration medium part as a member which connects the machine (vibrating body) which vibrates. As the shape of the vibration medium portion, it is assumed that U-shaped force conversion portions 450 are arranged at both ends of the prism and are integrally configured. Then, the vibroelectric conversion device 250 is joined to the two surfaces of the central prism. The U-shaped force conversion unit 450 has a role of converting the translational vibration of the vibrating body 460 in three directions (X direction, Y direction, and Z direction) into a curved deformation of a central prism. Thereby, the conversion part A is bent by the translational vibration in the X direction and the Y direction, the conversion part B is bent by the vibration in the Z direction, and the oscillating electrical conversion device 250 can generate power.

  The present invention is not limited to the above-described embodiment, and various improvements and modifications may be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, Galfenol has been described as an example of the magnetostrictive material constituting the magnetostrictive rod. However, the magnetostrictive material is not limited to Galfenol, and may be other materials. For example, permendur which is an iron cobalt alloy may be used.

  In addition, the shape of the magnetostrictive rod is not limited to the shape shown in the above-described embodiment, and may be, for example, a cylindrical rod shape or other shapes. Further, the shape and size of the joining yoke are not limited to the above example, and may be changed. Further, the shape, size, and material of the permanent magnet are not limited to the above example, and may be changed.

  Further, the method of joining the magnetostrictive rod to the joining yoke is not limited to the above example, and other methods may be used.

  In addition, the above-described oscillating electrical conversion device may have a configuration including a magnetic pole piece or a configuration including a back yoke. Moreover, the structure which is not provided with a pole piece and a back yoke may be sufficient as an oscillating electricity conversion device. Further, the shapes of the pole piece and the back yoke are not limited to the shapes described above, but may be other shapes.

  Moreover, you may change suitably the number of turns of a coil, and the material and thickness of the conducting wire which comprise a coil.

  Further, the vibration medium unit is not limited to the example shown in the above embodiment, and may be any medium. Further, the shape of the vibration medium portion is not limited to the configuration shown in the above embodiment, and may be a plate shape, a rod shape, a circular tube shape, a ring shape, or the like. Moreover, the structure which has a both-ends U-shaped connection board, a tuning fork, etc. which connect both ends to U-shape may be sufficient.

  In addition, the oscillating electrical conversion device according to the present invention includes another embodiment realized by combining arbitrary components in the above-described embodiment, and a range that does not depart from the gist of the present invention with respect to the embodiment. Modifications obtained by various modifications conceived by those skilled in the art, various devices including the oscillating electrical conversion device according to the present invention, for example, portable electronic devices such as mobile phones and music players, in-body sensors, and ultra-compact power supply Devices, actuators and the like are also included in the present invention.

  The present invention relates to a device that generates vibration, in particular, an electronic device such as a mobile phone that generates vibration on a daily basis, a power generation device for supplying power to a sensor mounted on a vibrating object, or the like. This is useful for an information terminal or the like that generates vibration and gives the user a click feeling.

10, 210, 220, 410, 420, 430, 440 Vibration medium part 100, 150, 170, 200, 250, 300 Vibratory electrical conversion device 102, 202, 302 Magnetostrictive rod 103, 203, 303 Coil 104a, 104b, 204a, 204b, 304a, 304b Joining yoke 105a, 105b, 205a, 205b, 305a, 305b Permanent magnet 120 Voltmeter 130 Strain gauge 160a, 160b, 207a, 207b, 307a, 307b Back yoke 180a, 180b Non-magnetic layer 206a, 206b, 407a , 407b Pole pieces 208a, 208b Peeling prevention cover 214a Lower joint yoke 214b Upper joint yoke 450 Force conversion section (vibration medium section)
460 Vibrating body

Claims (10)

A magnetostrictive rod that mutually converts mechanical strain and magnetic flux change due to vibration by the magnetostrictive effect;
A coil wound around the magnetostrictive rod;
A joining yoke joined to each of both ends of the magnetostrictive rod;
A permanent magnet for forming a magnetic flux loop through the magnetostrictive rod,
The joining yoke is joined to a vibration medium part for applying vibration to the magnetostrictive rod,
An oscillating electrical conversion device in which a parallel beam is constituted by the magnetostrictive rod and the vibration medium part. 2. The vibroelectric conversion device according to claim 1, wherein the magnetostrictive rod has an aspect ratio of 20 or more and 40 or less. 3. The vibroelectric conversion device according to claim 1, further comprising a back yoke disposed in parallel with the magnetostrictive rod and partially connected to the permanent magnet. The oscillating electrical conversion device according to claim 1, wherein the vibration medium unit is a non-magnetic material. The oscillating electrical conversion device according to claim 1, further comprising a nonmagnetic layer between the joining yoke and the vibration medium unit. The said joining yoke is formed in the taper shape so that height may become low toward the other end to which the said magnetostriction rod is not joined from the end where the said magnetostriction rod was joined. The vibratory electrical conversion device according to Item. The joining yoke is
A lower joint yoke disposed under the magnetostrictive rod and joined to the vibration medium part;
An upper joint yoke disposed on the magnetostrictive rod disposed on the lower joint yoke, and sandwiching the magnetostrictive rod with the lower joint yoke;
7. The oscillating electrical conversion device according to claim 1, wherein at least one of the lower joint yoke and the upper joint yoke has a recess for fitting the magnetostrictive rod. The oscillating electrical conversion device according to claim 1, wherein the bonding yoke is covered with a peeling prevention cover for preventing the bonding yoke from peeling from the vibration medium portion. 9. The vibroelectric conversion device according to claim 1, wherein the magnetostrictive rod is disposed at a position shifted from a neutral axis when the vibration medium portion is curved. A vibroelectric conversion device in which two vibroelectric conversion devices according to claim 1 are arranged in parallel.