JP2007081838A - Sounding implement using super-magnetostrictive actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sounding implement 10a which is capable of fixing a super-magnetostrictive actuator to an object of fixing with a proper arrangement, preventing sounds from leaking to the outside, making various kinds of objects of fixing serve as transmitting mediums of sounds, and utilizes the super-magnetoresistive actuator. <P>SOLUTION: The sounding implement 10a using the super-magnetoresistive actuator 2 is equipped with the super-magnetoresistive actuator 2, a holding member 11 that holds the case 21 of the super-magnetoresistive actuator 2, a fixing member 12 that fixes the holding member 11 to an object A for fixing in a detachable manner so as to bring the end of the movable rod of the super-magnetoresistive actuator 2 into contact with the object A of fixing, and an elastic member 13 that is arranged between the holding member 11 and the super-magnetoresistive actuator 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a sound producing tool using a giant magnetostrictive actuator including a giant magnetostrictive element.

  The giant magnetostrictive actuator utilizes the dimensional change (extension / contraction) of the giant magnetostrictive element that occurs according to the strength of the magnetic field, and has recently attracted attention as a high-speed, large displacement, high-power actuator. Conventionally, a giant magnetostrictive element has been used in a general acoustic device such as a speaker by utilizing the characteristics of the giant magnetostrictive element.

  When an electrical signal is input as an audio signal, the acoustic instrument generates a magnetic field according to the electric signal, and further expands and contracts the giant magnetostrictive element by the magnetic field, thereby vibrating the diaphragm, thereby It was shaking and outputting sound.

For example, Patent Literature 1 discloses a coil connected to an acoustoelectric signal current source, a super magnetostrictive material provided in the coil, an outer box for fixing one end of the super magnetostrictive material, and the other end of the super magnetostrictive material. There is described a sounding body comprising an attached vibration transmitting body, wherein the vibration transmitting body is brought into contact with any other object so that the object is oversounded. The sounding body can transmit vibration of the giant magnetostrictive material to an object to be sounded by bringing the vibration transmitting body into contact with an arbitrary object, and can vibrate and sound the object.
Japanese Utility Model Publication No. 4-92899

  Since the sounding body transmits sound by vibration of the giant magnetostrictive material, it is necessary to attach the vibration transmitting body to the attachment object accurately. Therefore, when the sounding body is attached, it is necessary to attach the sounding body accurately by holding it with a hand or the like or attaching it to an object, or providing a new attachment. Further, in order to accurately transmit sound, it is necessary to improve the mounting accuracy, and high technology is required for the installation accuracy and mounting operation of the sounding body.

  Therefore, although it is a giant magnetostrictive actuator that can be originally applied to various uses, it takes time to mount the actuator, and it is difficult to install it at an appropriate place as required. For this reason, it has not been able to be fully utilized, which has hindered the widespread use of giant magnetostrictive actuators.

  Further, when the giant magnetostrictive actuator is fixed to the attachment object, depending on the attachment method, not only the sound is transmitted to the attachment object, but the sound may leak to the outside of the sounding body.

  The present invention has been made in view of the above-mentioned various problems, and the giant magnetostrictive actuator can be attached to the attachment object in an appropriate arrangement, and various attachment objects can be attached with little sound leakage from the sounding tool to the outside. It is a technical object to provide a sound producing tool using a giant magnetostrictive actuator that can be used as a sound transmission medium.

The present invention is configured as follows in view of the above problems. A giant magnetostrictive element, a magnet that applies a magnetic field to the giant magnetostrictive element, a coil that applies a magnetic field change to the giant magnetostrictive element, a case that houses the giant magnetostrictive element, the magnet, and the coil, and one end that is the giant magnetostrictive element A giant magnetostrictive actuator having a movable rod that is coupled and the other end protrudes from the case; a holding member that holds the case of the giant magnetostrictive actuator; and the other end of the movable rod of the giant magnetostrictive actuator as an attachment object A giant magnetostriction comprising: a fixing member that detachably fixes the holding member to an attachment object so as to come into contact; and an elastic member disposed between the holding member and the giant magnetostrictive actuator. A sounding tool that uses an actuator.

  According to the sounding device using the giant magnetostrictive actuator according to the present invention, the giant magnetostrictive actuator is held by the holding member, the holding member is detachably attached to the attachment target by the fixing member, and vibration is transmitted to the attachment target. A sound can be generated from an attachment object. In addition, since an elastic member is provided between the giant magnetostrictive actuator and the holding member, vibration from the giant magnetostrictive actuator can be prevented from being transmitted to the holding member, and sound leakage from the sounding tool to the outside can be prevented.

  For example, if the holding member and the giant magnetostrictive actuator are fixedly joined, vibration of the giant magnetostrictive actuator is transmitted not only to the object to be attached, but also to the holding member, although it is minute, and may be transmitted to the outside via the holding member, and sound may leak. is there. However, by providing the elastic member, the elastic member can absorb vibration.

  Furthermore, by providing the elastic member, even when the mounting accuracy of the giant magnetostrictive actuator is not sufficient, the error can be absorbed by the elastic member, and the vibration of the giant magnetostrictive actuator can be transmitted to the mounting object more accurately. It becomes.

  In the sounding tool using the giant magnetostrictive actuator according to the present invention, it is preferable that the fixing member is an elastic material having adsorptivity. The adsorptive property is a property of sticking to an object that is an attachment target. When the fixing member has adsorptivity, the giant magnetostrictive actuator can be easily fixed to the attachment object via the fixing member. In addition, the attractive force between the giant magnetostrictive actuator and the attachment object is increased, and the stability of the sounding tool is increased.

  Furthermore, since the fixing member has adsorptivity, the tip of the movable rod of the giant magnetostrictive actuator, that is, the portion that transmits vibration can be applied to the attachment object. Therefore, in addition to the weight of the sounding tool, a load of adsorption force is applied, and vibration can be transmitted more efficiently. In addition, since the fixing member is an elastic material, it is possible to absorb external force to the sounding tool and easily transmit only the vibration of the giant magnetostrictive actuator to the attachment object.

  The attachment object according to the present invention may be any material as long as it has a hardness capable of transmitting the vibration of the giant magnetostrictive actuator, and various materials are suitable. Can be used.

  Thus, when using magnetic metals, such as iron, as an attachment target object, it is desirable that the fixing member is a magnetized hard material (ferromagnetic material). When the attachment object is magnetic, the sounding tool can be easily attached to the attachment object and can be easily removed by the ferromagnetic material being magnetized. it can. Furthermore, it is possible to improve the adsorptivity between the giant magnetostrictive actuator and the object to be attached by increasing the magnetic property as necessary.

  The sounding instrument using the above-described giant magnetostrictive actuator can transmit vibrations and output sound from the attachment object by being fixed to various attachment objects. For example, furniture such as tables and shelves, housing equipment such as doors, kitchens and windows, and various display devices can be attached objects, and can be applied not only as a sound generator (speaker) that emits sound, Thus, communication can be performed as a sound transmission medium.

  According to the sounding tool using the giant magnetostrictive actuator according to the present invention, the giant magnetostrictive actuator can be attached to the attachment object in an appropriate arrangement, and various attachment objects can be attached with little sound leakage from the sounding tool to the outside. It becomes possible to make a sound transmission medium.

<Embodiment 1>
Hereinafter, a preferred embodiment 1 of the present invention will be described with reference to the drawings. The first embodiment is an embodiment in which a sounding tool 10a using a giant magnetostrictive actuator 2 is attached to a table A, and the table A is used as a sound transmission medium. FIG. 1 is a perspective view of a state in which the sounding tool 10a using the giant magnetostrictive actuator 2 according to Embodiment 1 is attached to the table A, and FIG. 2 is a cross-sectional view of the sounding tool 10a using the giant magnetostrictive actuator 2. It is. 2A shows a state where the sounding tool 10a is not fixed to the table A, and FIG. 2B shows a state where the sounding tool 10a is fixed to the table A.

  The sounding tool 10a using the giant magnetostrictive actuator 2 is detachably attached to a glass table A. A battery-driven amplifier 3 is connected to the sounding tool 10a, and a PDA 4 that is a sound source is connected to the battery-driven amplifier 3. The battery-driven amplifier 3 is an amplifier having a battery function, and greatly adjusts sound input from the PDA 4 as a sound source.

  The sounding tool 10a contacts the table A with the giant magnetostrictive actuator 2 shown in detail in FIG. 3, the holding member 11 holding the case 21 of the giant magnetostrictive actuator 2, and the end of the movable rod 22 of the giant magnetostrictive actuator 2. As described above, the suction cup 12 as a fixing member for detachably attaching the holding member 11 to the table A, the rubber material 13 as an elastic material disposed between the holding member 11 and the giant magnetostrictive actuator 2, and the rubber material And a screw 14 for fixing the giant magnetostrictive actuator 2 in the holding member 11 via 13.

  Since the rubber member 13 is provided between the holding member 11 and the giant magnetostrictive actuator 2, the sounding tool 10 a is a sound transmission object that makes it difficult for vibration of the giant magnetostrictive actuator 2 to be transmitted to the holding member 11. It can be easily transmitted only to the table A. Therefore, sound leakage from the sounding tool 10a to the outside can be prevented. Further, since the sounding tool 10a includes the suction cup 12, the suction force of the sounding tool 10a to the table A can be increased, and the stability of the sounding tool 10a is improved and the load on the table A of the giant magnetostrictive actuator 2 is increased. Can be added.

  As shown in FIG. 2A, when the sounding tool 10a is not attached to the table A, the suction cup 12 and the rubber material 13 are not subjected to compressive force and are not elastically deformed. On the other hand, when the sounding tool 10a is attached to the table A, the suction cup 12 and the rubber material 13 receive a compressive force and elastically deform due to the suction force of the suction cup 12, as shown in FIG. The sounding tool 10a shown in FIG. 2 is compressed and deformed by ΔL in the height direction. At this time, the force F applied to the sounding tool 10a and the giant magnetostrictive actuator 2 with respect to the table A is the own weight F1 of the sounding tool 10a including the giant magnetostrictive actuator 2 + the suction force F2 of the suction cup 12. That is, by using the suction cup 12 as the fixing member, the installation force of the giant magnetostrictive actuator 2 is increased by the amount of the suction force of the suction cup 12, and the transmission of vibration to the table A can be improved.

Next, the giant magnetostrictive actuator 2 constituting the sounding tool 10a will be described in detail with reference to FIG. The giant magnetostrictive actuator 2 includes a giant magnetostrictive element 27, a coil 28 that applies a magnetic field change to the giant magnetostrictive element 27, a spring 24 that applies a compressive load to the giant magnetostrictive element 27, and the giant magnetostrictive element 2.
7 includes magnets 25 and 26 for applying a bias magnetic field to the case 21. A base end of the giant magnetostrictive element 27 is positioned in the case 21, a movable rod 22 is connected to the free end, and a spring 24 is disposed between the movable rod 22 and the case 21. The case 21, the movable rod 22 and the spring 24 are made of a magnetic material such as iron.

  The case 21 includes a bottomed cylindrical case main body 21a that is open at one end side (upper end in FIG. 3), and a lid 23 that closes the opening of the case main body 21a. In this embodiment, the spring 24 is formed as a disc spring. The distal end of the movable rod 22 penetrates through the central portion of the disc spring 24 and the holes 24a and 23b provided coaxially in the lid 23 and protrudes to the outside. The peripheral edge of the disc spring 24 is in close contact with the inner surface of the case main body 21 a and covers the hole 23 b of the lid 23 from the inside of the case 21.

  A disc spring recess (first recess) 23 a is provided on the inner surface of the lid 23 to fit and position the peripheral edge of the disc spring 24. The reason why the first recess 23a for positioning by inserting the peripheral edge of the disc spring 24 into the inner surface of the lid 23 is provided is to reliably position the disc spring 24 itself. Further, the movable rod 22 penetrating through the central portion of the disc spring 24 can also be positioned (centered) by the disc spring 24. The flange 22b of the movable rod 22 has a two-stage configuration having a step part 22c in the middle. By fitting the hole 24a at the center of the disc spring 24 into the stepped portion 22c, a close contact structure is obtained.

  Magnets 25 and 26 for applying a bias magnetic field to the giant magnetostrictive element 27 are disposed at the proximal end and the free end of the giant magnetostrictive element 27, respectively. The base end of the movable rod 22 is provided with a connecting recess (second recess) 22a for fitting and positioning the free end of the giant magnetostrictive element 27 and the magnet 25 disposed at the free end. A flange 22b is provided at the base end of the movable rod 22 to increase the diameter of the base end. The second recess 22a is formed as a recess having a downward opening. The depth of the second recess 22 a is formed deeper than the thickness of the magnet 25. Thereby, the magnet 25 is accommodated in the second recess 22a, and the free end of the giant magnetostrictive element 27 is also inserted.

  The second recess 22a having such a depth is provided because both the free end of the giant magnetostrictive element 27 and the magnet 25 disposed at the free end are coaxial with the movable rod 22 by the second recess 22a. This is to enable positioning. Thereby, the free end of the giant magnetostrictive element 27, the magnet 25 arranged at the free end, and the base end of the movable rod 22 can be centered and connected with high accuracy so as not to be displaced. As a result, the giant magnetostrictive element 27, the magnet 25, and the movable rod 22 can be connected without using an adhesive or the like. Of course, it can also be connected by an adhesive or the like.

  The bottom surface portion 21b of the case body 21a is provided with a positioning concave portion (third concave portion) 21c for fitting and positioning the base end portion of the giant magnetostrictive element 27 and the magnet 26 arranged at the base end portion. ing. The third recess 21c is formed as a recess having an upward opening. The depth of the third recess 21 c is formed deeper than the thickness of the magnet 26. Thereby, the magnet 26 is accommodated in the third recess 21c, and the base end portion of the giant magnetostrictive element 27 is also inserted.

  The third concave portion 21c having such a depth is provided by the third concave portion 21c so that both the base end portion of the giant magnetostrictive element 27 and the magnet 26 disposed at the base end portion are placed on the bottom surface of the case body 21a. This is for positioning coaxially with respect to the portion 21b. Thereby, the base end of the giant magnetostrictive element 27 and the magnet 26 arranged at the base end can be centered and positioned with high accuracy so as not to be displaced from the bottom surface portion 21b of the case main body 21a.

A bobbin concave portion (fourth concave portion) 21d for fitting and fixing a part of the bobbin 29 of the coil 28 is provided on the bottom surface portion 21b of the case main body 21a. The bobbin 29 has a cylindrical portion through which the giant magnetostrictive element 27 passes and disk-shaped flanges provided at both ends thereof. Accordingly, the planar shape of the fourth recess 21 d corresponds to the shape of the end surface of the bobbin 29. It is formed as a so-called donut-shaped recess. The fourth recess 21d is provided because the bobbin 29 of the coil 28 is reliably positioned with respect to the bottom surface part 21b of the case main body 21a, and the gap between the giant magnetostrictive element 27 and the bobbin 29 is made with high accuracy. This is to make it possible to set a minute gap. A cylindrical rib is raised at the central portion of the bottom surface portion 21b, and the third concave portion 21c and the fourth concave portion 21d are formed by this rib.

  In the first embodiment, the case 21 including the case main body 21a and the lid 23, the movable rod 22, and the disc spring 24 are formed of a magnetic material, and the bobbin 29 of the coil 28 is heated. It is made of conductive resin. By forming the bobbin 29 with a heat conductive resin, the heat dissipation of the bobbin 29 itself can be enhanced. That is, it is possible to enhance the heat dissipation effect from the heat generating coil 28 and the giant magnetostrictive element 27, and to solve the problem that the characteristics change due to heat generation, the vibration state changes, and the high frequency characteristics of the sound deteriorate. it can.

  Further, according to the first embodiment, since the case 21, the movable rod 22 and the disc spring 24 are made of a magnetic material, the bias magnetic field applying magnets 25 disposed at both ends of the giant magnetostrictive element 27, The magnetic field by 26 constitutes a complete magnetic circuit (closed loop) that passes through the movable rod 22, the disc spring 24, and the case 21, as indicated by a broken line with an arrow in FIG. Thereby, high efficiency of the giant magnetostrictive actuator 2 can be realized. As a result, battery driving can also be realized, and this giant magnetostrictive actuator 2 can be incorporated into, for example, a mobile product. Furthermore, by increasing the efficiency in this way, it is possible to reduce the size accordingly.

Next, a method for mounting and using the sounding tool 10a using the giant magnetostrictive actuator 2 configured as described above will be described. The mounting method is configured such that the tip of the movable rod 22 of the giant magnetostrictive actuator 2 and the table A are in contact with each other. In the first embodiment, since the table A as an attachment object is a mirror surface, the giant magnetostrictive actuator 2 is directly fixed to the table A. However, when the table A is a non-mirror surface, the giant magnetostrictive actuator 2 and the table are fixed. It is desirable to provide a mirror thin plate 16 made of a seal or the like between A and A (see FIG. 4). Thereby, the giant magnetostrictive actuator 2 can be attracted and fixed.

  It is desirable that the installation pressure of the sounding tool 10a on the table A is higher. By increasing the installation pressure, the stability of the giant magnetostrictive actuator 2 is improved, vibrations are transmitted well, and a better timbre can be output. The sounding tool 10a according to the first embodiment can increase the installation pressure by the suction force of the suction cup 12. Further, since the rubber material 13 also has elastic force and is fixed by the screw 14, the rubber material A is elastically deformed with the sounding tool 10a attached to the table A, whereby the giant magnetostrictive actuator 2 is moved to the table A side. The installation pressure can be increased.

  In the first embodiment, the diameter of the giant magnetostrictive element 27 is 3 mm, and the giant magnetostrictive actuator 2 is adjusted to be added to the table A by 0.35 kg. However, it is desirable to change this value appropriately according to the embodiment, and it may be in a range not exceeding 5 kg / cm 2 in the area of the giant magnetostrictive element 27 of the giant magnetostrictive actuator 2.

As described above, according to the first embodiment, the sounding tool 10a using the giant magnetostrictive actuator 2 can be attached to the table A, which is an attachment target, in an appropriate arrangement, and various purposes can be achieved to prevent sound leakage to the outside. Can be applied to. In the first embodiment, the giant magnetostrictive actuator 2 is attached to the table A. However, the present invention is not limited to this, and not only a speaker but also a plurality of attachment objects can be used as sound transmission media. Communication is also possible.

<Embodiment 2>
The sounding tool 10b according to the second embodiment is obtained by replacing the suction cup 12 which is a fixing member of the sounding tool 10a according to the first embodiment with a magnet 15a and a yoke 15b which are magnetic members. Since other configurations are the same as those in the first embodiment, the same reference numerals are used and description thereof is omitted. FIG. 5 is a cross-sectional view of the sounding tool 10 b using the giant magnetostrictive actuator 2. 5A shows a state in which the sounding tool 10b is not fixed to the table B, and FIG. 5B shows a state in which the sounding tool 10b is fixed to the table B.

  The sounding tool 10b is detachably attached to a magnetic metal table B. A battery-driven amplifier 3 is connected to the sounding tool 10b, and a PDA 4 that is a sound source is connected to the battery-driven amplifier 3.

  The sounding tool 10 b includes the giant magnetostrictive actuator 2, the holding member 11, a magnet 15 a as a fixing member, a yoke 15 b, the rubber material 13, and the screw 14.

  Similar to the sounding tool 10a, the sounding tool 10b is provided with a rubber material 13 between the holding member 11 and the giant magnetostrictive actuator 2, so that the vibration of the giant magnetostrictive actuator 2 is hardly transmitted to the holding member 11. , It can be easily transmitted only to the table B. Therefore, sound leakage from the sounding tool 10b to the outside can be prevented.

  The fixing members of the sounding tool 10b are a magnet 15a and a yoke 15b, which are ferromagnetic members. FIG. 6 is a cross-sectional view of the fixing member according to the second embodiment, and the magnet 15a is included in the yoke 15b. Thus, the magnetic force can be increased by combining the magnet 15b and the yoke 15b. Since the attachment object has magnetism, the attractive force of the sounding tool 10b on the table B can be increased by the magnetic field attraction, and the stability of the sounding tool 10b is improved and the load on the table B of the giant magnetostrictive actuator 2 is added. can do. Furthermore, since the fixing member of the sounding tool 10b according to Embodiment 2 is the magnet 15a, it can be easily removed and moved to an appropriate place for use.

  As shown in FIG. 5A, in a state where the sounding tool 10b is not attached to the table B, the magnet 15a and the table B are not attracted, and the rubber material 13 does not receive a compressive force and does not elastically deform. On the other hand, when the sounding tool 10b is attached to the table B, as shown in FIG. 5B, the rubber material 13 receives a compressive force and elastically deforms due to the magnetic force of the magnet 15a. The sounding tool 10b shown in FIG. 5 is compressed and deformed by ΔL in the height direction. At this time, the force F of the sounding tool 10b with respect to the table B is the weight F1 of the sounding tool 10b including the giant magnetostrictive actuator 2 + the attractive force F2 of the magnet 15a. That is, the installation force of the giant magnetostrictive actuator 2 is increased by the amount of magnetic force of the magnet 15a, and the transmission of vibration can be improved.

  In the second embodiment, since the table B that is an attachment object is a magnetic metal, the super magnetostrictive actuator 2 is directly fixed to the table B. However, when the table B is not a magnetic metal, the super magnetostrictive actuator 2 and It is desirable to provide a thin plate 17 made of magnetic metal between the table B (see FIG. 7). Thereby, the giant magnetostrictive actuator 2 can be fixed to the table B.

  As described above, according to the second embodiment as well, the sounding tool 10b using the giant magnetostrictive actuator 2 can be attached to the table B that is an attachment target in an appropriate arrangement, and the vibration is absorbed by the rubber material 13 to the outside. Sound leakage can be prevented.

  As mentioned above, although the embodiment of the sounding instrument using the giant magnetostrictive actuator according to the present invention has been exemplarily described, the present invention is not limited thereto, and includes combinations thereof as much as possible.

It is a perspective view which shows the attachment state of the sounding instrument using the giant magnetostrictive actuator which concerns on Embodiment 1. FIG. FIG. 3 is a cross-sectional view of a sound producing tool using the giant magnetostrictive actuator according to the first embodiment. It is sectional drawing of a giant magnetostrictive actuator. FIG. 3 is a cross-sectional view of a sound producing tool using the giant magnetostrictive actuator according to the first embodiment. It is sectional drawing of the sounding tool using the giant magnetostrictive actuator which concerns on Embodiment 2. FIG. 6 is a cross-sectional view of a fixing member according to Embodiment 2. FIG. It is sectional drawing of the sounding tool using the giant magnetostrictive actuator which concerns on Embodiment 2. FIG.

Explanation of symbols

2 Giant magnetostrictive actuator 3 Battery-powered amplifier 4 PDA
10a, 10b Sounding tool 11 Holding member 12 Suction cup 13 Rubber material 14 Screw 15a Magnet 15b Yoke 16 Mirror surface thin plate 17 Thin plate 21 Case 21a Case body 21b Bottom surface portion 21c Third recess 21d Fourth recess 21e Collar portion 22 Movable rod 22a Second recess 22b Flange 22c Step 23 Lid 23a First recess 23b Hole 24 Belleville spring 24a Hole 25, 26 Magnet 27 Super magnetostrictive element 28 Coil 29 Bobbin A, B Table

Claims (3)

A giant magnetostrictive element, a magnet for applying a magnetic field to the giant magnetostrictive element, a coil for applying a magnetic field change to the giant magnetostrictive element, a case for housing the giant magnetostrictive element, the magnet and the coil, and one end of the giant magnetostrictive element A magnetostrictive actuator having a movable rod connected to the other end and protruding from the case;
A holding member for holding the case of the giant magnetostrictive actuator;
A fixing member that detachably fixes the holding member to the attachment object so that the other end of the movable rod of the giant magnetostrictive actuator is in contact with the attachment object;
A sounding instrument using a giant magnetostrictive actuator, comprising: an elastic member disposed between the holding member and the giant magnetostrictive actuator.   The sounding tool using a giant magnetostrictive actuator according to claim 1, wherein the fixing member is an elastic material having adsorptivity.   The sounding tool using the giant magnetostrictive actuator according to claim 1, wherein the fixing member is a magnetized ferromagnetic material.

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