JP2010057112A - Acoustic generating device and acoustic system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acoustic generating device and acoustic system in which voice sound is easily heard even during traveling of a motorcycle and sound quality is improved. <P>SOLUTION: The acoustic generating device 1 includes: a coil 17 for generating a magnetic field in response to a signal input; a magnetostrictive element 16 that is deformed in accordance with the magnetic field from the coil 17; a case body 12 for housing therein the magnetostrictive element 16 and the coil 17; a contact member 11 which is abutted with the magnetostrictive element 16 and protruded from the case body 12; and a fixing component 20 for fixing the case body 12 onto a member 51 to be vibrated. The fixing component 20 is fixed in such a way that the magnetostrictive element 16 is abutted on the member 51 to be vibrated through the contact member 11. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a sound generator and a sound system.

  When driving a motorcycle, it is mandatory to wear a helmet. Therefore, in order for a driver to enjoy music while driving a motorcycle using a portable audio device or the like, the earphone needs to be worn on the ear. For this reason, there was a problem that the ear hurts when the earphone attached to the ear is pulled when the helmet is attached or detached. In addition, it is conceivable to incorporate a speaker in a helmet or chin guard, but in this case, it is necessary to modify the helmet. When the helmet is remodeled, the cord is connected to the helmet, so that handling of the helmet itself becomes complicated, for example, the cord gets tangled with the driver.

  In order to solve such problems, an acoustic generator that generates sound by storing a piezoelectric element as a vibration element and transmitting vibrations of the piezoelectric element to a plate material via a bonding surface of the piezoelectric element is provided. It is known (see Patent Document 1).

JP 2007-110608 A (abstract)

  When the above-described sound generation device is attached to the helmet, a part or all of the helmet as a plate material to which the sound generation device is attached is pronounced. Therefore, the user of the motorcycle can listen to good sound without using an earphone. However, as the traveling speed of the motorcycle increases, there is a problem that it is difficult for the user to hear the sound due to wind noise, engine sound, road surface traveling noise, or the like.

  Accordingly, an object of the present invention is to solve the above-described problems, that is, to provide a high-quality sound generating apparatus and sound system that can easily hear sound even while a motorcycle is running.

  In order to solve the above problems, as one aspect of the sound generator according to the present invention, a coil that generates a magnetic field according to an input current, a magnetostrictive element that expands and contracts according to the magnetic field from the coil, a magnetostrictive element, and A case body in which the coil is housed, a contact member that contacts the magnetostrictive element and protrudes from the case body, and a fixing component for fixing the case body to the member to be vibrated. The sound generator is configured such that the element is fixed so as to come into contact with the member to be vibrated through the contact member.

  As another aspect of the present invention, in addition to the above-described invention, the contact member is formed in a shape that follows the contact portion with the member to be vibrated.

  As another aspect of the present invention, in addition to the above-described invention, the gap between the case body and the contact member is covered with a protective member that prevents foreign substances from entering.

  An aspect of an acoustic system according to another invention includes a first coil that generates a magnetic field according to an input current, a magnetostrictive element that expands and contracts according to a magnetic field from the first coil, a magnetostrictive element, A case body in which one coil is accommodated, a contact member that abuts on the magnetostrictive element, protrudes from the case body, the case body is fixed to the vibration member, and the magnetostriction element is attached to the vibration member via the contact member. In addition to a first sound generator including a fixing component that is fixed so as to abut, a first magnetic generator that includes a magnetized magnetic element and a second coil that circulates around the magnetic element with a gap provided therebetween. The second sound generator is configured to transmit vibration to the member to be vibrated by moving the magnetic element in accordance with the magnetic field generated by the second coil.

  Further, according to another aspect of the invention, in addition to the above-described invention, the member to be vibrated is a part of a helmet.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as a high-quality sound generator and sound system that it is easy to hear a sound even while the motorcycle is running.

(First embodiment)
Hereinafter, a sound generator 1 according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a perspective view of a sound generator 1 according to an embodiment of the present invention.

  The sound generator 1 is a device that reproduces sound by vibrating a member to be vibrated. The sound generator 1 mainly includes a magnetostrictor 10 and a clip 20 that convert an input signal into vibration. Further, the contact member 11, the case body 12, and the protective member 15 surrounding the connection portion between the contact member 11 and the case body 12 are exposed to the outside of the magnetostrictive device 10. 1 to 3, the surface side of the contact member 11 in contact with the member to be vibrated is the Z1 direction, and the opposite side to the Z1 direction is the Z2 direction. Further, in the longitudinal direction of the clip 20, the opening side is the X2 direction, and the opposite is the X1 direction. Of the short side directions of the clip 20, the rear side of the paper is defined as the Y1 direction, and the front side of the paper is defined as the Y2 direction.

  FIG. 2 is a perspective view of the magnetostrictor 10 of the sound generator 1 as viewed from the Y2 direction. 3 is a cross-sectional view of the magnetostrictive device 10 taken along the XZ plane including the WW line shown in FIG.

  The case body 12 of the magnetostrictive device 10 is mainly composed of a case base portion 13 and a sealing portion 14. The case body 12 includes a magnetostrictive element 16 and a coil 17. The surface on the Z1 direction side of the magnetostrictive element 16 is in contact with or bonded to the contact member 11. The coil 17 circulates around the magnetostrictive element 16 with the Z-axis direction as an axis.

  The contact member 11 is a part that contacts the member to be vibrated. Specifically, the contact member 11 has the contact plate 11a, the support portion 11b, and the magnetostrictive element connection portion 11c in this order in the Z2 direction, and the surface on the Z1 direction side of the contact plate 11a is the vibration member. Contact. The surface on the Z2 direction side of the magnetostrictive element connecting portion 11c is in contact with the surface on the Z1 direction side of the magnetostrictive element 16.

  The contact plate 11a, the support portion 11b, and the magnetostrictive element connection portion 11c have a cylindrical shape in which the XY cross section forms a circle, and the cross sectional area of the XY plane of the support portion 11b is smaller than that of the contact plate 11a. Further, the cross-sectional area of the magnetostrictive element connection portion 11c in the XY plane is smaller than the cross-sectional area of the support portion 11b in the XY plane. In addition, the surface in the Z1 direction of the contact plate 11a is curved with a curvature substantially the same as the mounting surface of the member to be vibrated so that the surface can be brought into close contact with the surface of the member to be vibrated.

  The case body 12 has a cylindrical appearance. The case body 12 includes a case base portion 13 and a sealing portion 14 having substantially the same outer periphery as the outer periphery of the case body 12. The case base portion 13 includes a bottom portion 13a facing the XY plane, and a side wall 13b erected in the Z-axis direction from the outer peripheral portion of the bottom portion 13a. Therefore, the case base portion 13 is provided with a space for arranging the magnetostrictive element 16 and the coil 17 and is open on the Z1 direction side. Furthermore, an extending portion 13c is provided at the end of the side wall 13b in the Z1 direction. The outer periphery of the extension part 13c and the outer periphery of the side wall 13b are flush with each other. However, the thickness of the extending portion 13c in the radial direction is smaller than the thickness of the side wall 13b in the radial direction. Therefore, the Z1 direction side end of the side wall 13b is provided so as to be recessed toward the outside.

  The sealing portion 14 has the same diameter as the case base portion 13 and has a hole 14c that penetrates in the Z-axis direction. The hole 14c is substantially the same as or larger than the cross section of the magnetostrictive element 16 in the XY plane. Further, on the Z2 direction side of the sealing portion 14, an insertion portion 14b having a smaller XY cross section than the Z1 direction side of the sealing portion 14 is provided. The outer periphery of the insertion part 14b has the same outer periphery as the inner periphery of the extension part 13c. Therefore, when the sealing portion 14 is disposed in the opening of the case base portion 13, the insertion portion 14 b of the sealing portion 14 is fitted to the inner peripheral side of the extension portion 13 c of the case base portion 13.

  The protection member 15 is a member for preventing water, dust, and the like from entering from the gap between the inner peripheral surface of the hole 14 c of the sealing portion 14 and the outer peripheral surface of the magnetostrictive element 16. The protection member 15 abuts on the surface in the Z1 direction of the sealing portion 14 and the surface in the Z2 direction of the support portion 11b of the contact member 11, and circulates around the contact member 11 about the Z1 axis. The outer periphery of the end on the Z2 side of the protective member 15 is larger than the size of the hole 14c. On the other hand, the outer periphery of the end of the protective member 15 on the Z1 side is smaller than the outer periphery of the protective member 15 on the Z2 side. The protection member 15 is made of, for example, an elastic body such as rubber so as not to hinder the vibration of the contact member 11 caused by the expansion and contraction of the magnetostrictive element 16. Furthermore, the protection member 15 is configured in a stepped shape having a hollow inside. Therefore, the protection member 15 can be easily expanded and contracted in the Z-axis direction. Since the protection member 15 can expand and contract in the Z-axis direction following the vibration of the contact member 11, a gap can hardly be formed between the sealing portion 14 and the contact member 11.

  The magnetostrictive element 16 is an element that mainly expands and contracts in the Z-axis direction by a surrounding magnetic field. The magnetostrictive element 16 is preferably composed of a lanthanoid element such as terbium having a large magnetic moment and a metal compound such as iron element. Such a metal compound has a large amount of expansion and contraction due to a magnetic field, and has a high response speed to the magnetic field. In the present embodiment, the magnetostrictive element 16 has a cylindrical shape that is long in the Z-axis direction, and the end in the Z1 direction is in contact with or bonded to the self-strain element connecting portion 11 c of the contact member 11.

  The coil 17 has a hollow bobbin (not shown) and a winding (not shown). For example, a copper bobbin is wound around a resin bobbin having a hollow portion corresponding to the winding shaft. When both ends of the winding are pulled out and an electric signal is input from the end of the winding, the coil 17 generates a magnetic field corresponding to the electric signal. When the variable magnetic field emitted from the coil 17 penetrates the magnetostrictive element 16, the magnetostrictive element 16 expands and contracts in accordance with the strength of the variable magnetic field. In the present embodiment, the magnetostrictive element 16 is disposed in the hollow portion of the bobbin. That is, the winding is wound around the magnetostrictive element 16 to constitute the coil 17.

  The clip 20 is a spring-like member integrally formed by bending a rod-like member such as an elastically deformable metal or resin. The clip 20 may be formed not by bending but by molding. The clip 20 is formed so as to be in contact with the surface of the contact member 11 in the Z1 direction, and has a substantially U shape. A hole portion 21 having an outer periphery substantially the same as the outer periphery of the case body 12 is provided on one end side of the clip 20, and the case body 12 portion of the magnetostrictive device 10 is fitted into and bonded to the hole portion 21. ing.

  The sound generator 1 configured as described above can easily attach and detach the sound generator 1 to and from the vibration member by sandwiching the vibration member by the clip 20 and the contact member 11. Further, since the contact member 11 has a curved surface that follows the member to be vibrated, when the sound generator 1 is attached to the member to be vibrated, the contact member 11 and the member to be vibrated are in close contact with each other. Therefore, since the sound generator 1 can be securely fixed to the vibration member, the vibration member can be vibrated via the contact member 11, that is, the sound can be reproduced using the vibration member as a vibration surface. Become.

  In the sound generator 1, the contact member 11 is brought into contact with the vibration member, and vibrations generated by expansion and contraction of the magnetostrictive element 16 are transmitted to the vibration member via the contact member 11 to reproduce sound. For this reason, it is only necessary to attach the sound generator 1 to the member to be vibrated when performing music appreciation or the like, and it can be used as appropriate according to various environments.

  In addition, the sound generator 1 having a magnetostrictive element can listen to good sound while riding on a motorcycle and running. This is because, as will be described later in the embodiments, in the frequency band of about 1 KHz to 10 KHz, the sound pressure of the sound generator 1 according to the present invention uses a vibration element other than the magnetostrictive element 16. It is because it becomes larger than the sound pressure of.

  Next, the acoustic system 100 will be described.

  FIG. 4 is a perspective view showing an acoustic system 100 in which the acoustic generators 1, 1 are mounted on the helmet 60.

  The helmet 50 is a general one having a visor 51 that covers the front surface of the face. The visor 51 is made of a transparent resin such as polycarbonate. Since the visor 51 includes a convex surface having a curved surface substantially the same as the surface of the contact member 11 of the sound generator 1 facing the surface, the visor 51 is formed so as to contact at least a part of the surface of the contact member 11. ing. One sound generator 1, 1 is mounted on each of the left and right sides of the visor 51 so as to be symmetrical from the midline of the face. Specifically, a visor 51 is sandwiched and fixed between one end of the clip 20 and the contact member 11 of the sound generator 1 provided at the other end of the clip 20. As a result, the visor 51 comes into contact with the contact member 11. For this reason, the coil 17 to which the music signal / audio signal is input via the cord 52 generates a magnetic field, and the magnetostrictive element 16 expands and contracts in response to the magnetic field, so that the vibration is transmitted via the contact member 11 to the visor 51. The sound is played back.

  When the sound generator 1 is mounted on the visor 51 of the helmet 50 as described above, it is not necessary to put a sound source directly into the ear using an earphone as in the prior art. Disappear. Further, since the contact member 11 can be brought into and out of contact with the visor 51, it is not necessary to directly modify the helmet 50, and the conventional helmet 50 can be used. Further, when the helmet 50 is worn without listening to music or the like, the sound generator 1 does not need to be worn on the helmet 50, so that an obstacle such as the cord 52 is not attached to the helmet 50. For this reason, handling of the helmet 50 becomes easy. Further, since the sound is reproduced when the visor 51 vibrates, the rider of the motorcycle can secure a sufficient sound volume, and sound leakage to the surroundings can be extremely reduced.

(Second Embodiment)
Next, an acoustic system 200 according to the second embodiment will be described. Note that, in the acoustic system 200 according to the second embodiment, portions common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  FIG. 5 is a perspective view showing a state in which the sound generators 1, 1 and the sound generator 90 are attached to the helmet 50.

  In the acoustic system 200 according to the second embodiment, the acoustic generators 1 and 1 are attached to the visor 51 of the helmet 50 as in the acoustic system 100 of the first embodiment. In addition to the sound generator 1, a sound generator 90 is disposed on the back of the helmet 50. Further, a cord 52 extending from the sound generators 1, 1 and the sound generator 90 is connected to the connection portion 53.

  The sound generator 90 is a so-called moving coil type sound generator. FIG. 6 is a cross-sectional view of the acoustic generator 90 taken along a plane perpendicular to the attachment surface of the acoustic generator 90 and the helmet 50 including the TT line of FIG. 5. 7 is a cut perspective view of the sound generator 90 including the cross section of FIG.

  As shown in FIG. 5, the sound generator 90 has a substantially disk shape and includes a case 63 in which a magnetic circuit 61, a voice coil 62, and the like are accommodated. The magnetic circuit 61 is mainly composed of a permanent magnet 71, an inner plate 72, and an outer plate 73. The case 63 is mainly configured by a bottomed cylindrical case body 64 and a base plate 65 that closes an opening of the case body 64.

  A disc-shaped installation part 64 a is formed to protrude from the inner peripheral side bottom of the case body 64. A disk-shaped permanent magnet 71 is placed on the installation portion 64a. A disk-shaped inner plate 72 is disposed on the permanent magnet 71. A ring-shaped outer plate 73 is disposed on the inner peripheral side surface of the case body 64. The inner plate 72 and the outer plate 73 are fixed with a magnetic gap S in the outer circumferential direction of the ring. A cylindrical voice coil 62 is disposed in the magnetic gap S.

  Two ring-shaped dampers 74 and 75 are attached to the outer periphery of the voice coil 62 so as to be separated from each other in the axial direction of the voice coil 62. The outer peripheries of the dampers 74 and 75 are fixed to the inner surface of the case main body 64. Thereby, the voice coil 62 is held without being deviated from a predetermined position in the magnetic gap S. The dampers 74 and 75 are formed with slits at predetermined intervals in the circumferential direction and the radial direction. Further, one end portion (the upper end portion in FIGS. 6 and 7) of the voice coil 62 is fitted from the outside into a disc-shaped convex portion 65d protruding from the lower surface of the base plate 65, whereby the voice coil 62 is It is connected to the base plate 65.

  A ring-shaped packing 76 formed of an elastic member is provided between the inner periphery of the opening of the case body 64 and the outer periphery of the base plate 65. The packing 76 prevents dust and the like from entering the case main body 64.

  The cord 25 for inputting an acoustic signal to the voice coil 62 is inserted into the case main body 64 through a groove 77 formed in the upper end portion of the case main body 62 and connected to the winding of the voice coil 62. Further, as shown in FIG. 5, the cord 52 is connected to a joint for connecting to a cord 25 from an amplifier or a player. The winding of the voice coil 62 has two layers and one circuit. However, when music is reproduced by mixing L / R signals, the winding may be four layers and two circuits.

  A surface of the base plate 65 facing the helmet 50 is a concave curved surface. The curved surface is formed in a shape that follows the outer peripheral curved surface (convex curved surface) of the helmet 50 that is an attachment object. For example, when the outer peripheral curved surface of the helmet is a part of a spherical surface, the surface of the base plate 65 facing the helmet 50 is formed as a concave curved surface having substantially the same curvature as the spherical surface. Here, since the base plate 65 and the helmet 50 are formed of a hard material such as a metal or a hard resin, the surface of the base plate 65 that faces the helmet 50 and the outer peripheral curved surface of the helmet 50 are completely brought into close contact with each other. difficult. Therefore, a film material 78 is provided for bringing the surface of the base plate 65 facing the helmet 50 into close contact with the outer peripheral curved surface of the helmet 50. As this film material 78, for example, a flexible double-sided adhesive tape is preferably used. Then, the concave curved surface of the base plate 65 is tightly fixed to the outer peripheral curved surface of the helmet 50 by interposing the film material.

  When the acoustic generator 90 configured as described above is attached to the helmet 50, sufficient fixing strength can be obtained by closely fixing the concave curved surface of the base plate 65 to the outer peripheral curved surface of the helmet 50 with the membrane material 78. You can get the music characteristics.

  In addition, the acoustic generator 90 may be fixed to the wall surface of the helmet 50 by a fixing member 77 in order to improve reliability in consideration of outdoor use, weather, and the like. The fixing member 77 is a so-called clip-like member formed by integrally bending a rod-shaped member such as an elastically deformable metal or resin, like the fixing member 20 of the first sound generating device 1. Therefore, the sound generator 90 can be easily detached from the helmet 50. Further, the cord 52 extending from the sound generator 90 is connected to the connection portion 53.

  The acoustic system 200 configured as described above is easy to hear the voice during traveling while keeping the voice in a wider frequency range. This is because when the magnet 62 and the plate 64 vibrate, the entire case 70 vibrates and the member to be vibrated resonates, that is, the vibration is transmitted to the helmet 50, so that the helmet 50 resonates. And the sound generator 90 emits a low sound (for example, sound of a sound range of 1 kHz or less) from the back of the helmet 50 by using the helmet 50 as a diaphragm. In addition, the sound generators 1 and 1 emit a high sound (for example, sound in a range of 1 kHz or higher) from the visor 51 side.

  Moreover, by attaching the sound generators 1 and 1 to the visor 51 portion of the helmet 50, it becomes easy to emit a high sound. This is because the visor 51 is thinner than the helmet 50 and therefore easily propagates minute vibrations. On the other hand, by attaching the sound generator 90 to the main body side of the helmet 50, the vibration member to emit low sound and the vibration member to emit high sound are separate members, so that a high-quality sound with a three-dimensional feeling is obtained. Can be reproduced.

Example 1
FIG. 8 shows a sound generator 1 according to an embodiment of the present invention, that is, a sound generator 1 (implementing apparatus A) using a magnetostrictive element 16 as a vibration element, and a sound generation using a piezoelectric element as a vibration element. It is a figure which shows the frequency characteristic of an apparatus (comparison apparatus B). The sound pressure was measured in an anechoic chamber with a dummy head with the implementation device A and the comparison device B attached to the helmet 50, respectively.

  As shown in FIG. 8, in the region of 4 Hz or less, the sound pressure of the implementation apparatus A is not significantly different from the sound pressure of the comparison apparatus B. However, paying attention to a frequency band (frequency band indicated by “C” in FIG. 8) in the vicinity of about 4 Hz to 10 KHz, the sound pressure of the implementation apparatus A is larger than that of the comparison apparatus B. That is, it was found that the sound pressure of the comparison device B began to decrease significantly at 3 to 4 KHz or higher, and that the implementation device A was clearly superior in sound quality at high frequencies. Further, as a result of listening to the sounds of both devices while actually running on a motorcycle, the implementation device was superior to the comparison device B in sound quality.

  From the above experimental results, by using the sound generator 1 using the magnetostrictive element 16 as a vibration element rather than the sound generator using the piezoelectric element as a vibration element, the sound output in the vicinity of about 1 KHz or more and 10 KHz or less is improved. As a result, it was found that good audio can be heard when listening to a sample while running on a motorcycle.

(Example 2)
FIG. 9 is a diagram illustrating frequency characteristics of the sound generation device 1 (implementing device A) and the sound generation device 90 (acoustic device M) included in the sound system 200 according to the second embodiment of the present invention. The sound pressure was measured by the same method as in Example 1.

  As shown in FIG. 9, the acoustic device M is in charge of the low range of 5 KHz or lower, and the implementation device A maintains a high sound pressure in the frequency region of 5 KHz or higher where the sound pressure drops suddenly in the acoustic device M. I understand. Therefore, in the system combining the implementation apparatus A and the acoustic apparatus M, a good sound pressure can be obtained as a whole. As a result of actually listening to the sound while running on a motorcycle, the sound can be heard even when traveling at high speed, and the sound quality that can be heard at low speed or when the vehicle is stopped has improved.

  From the above experimental results, by providing both the moving magnet type sound generation device 90 and the sound generation device 1 using the magnetostriction device 10, the viewer can listen to the sound during high speed running and low speed running. In addition, it was found that the sound quality of the audible voice can be improved during low-speed driving.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and can be implemented in various modifications.

  For example, in the above-described embodiment, the clip 20 or the fixing component 77 that is a fixing component is used as a means for attaching the sound generation device 1 and the sound generation device 90 to the vibrating member. It is not limited to the fixing component 77. For example, other means such as a suction cup, a magnet, or screw fixing may be employed.

  Moreover, in the above-mentioned embodiment, although the magnetostriction apparatus 10 is provided with the protection member 15, the protection member 15 is not essential. However, the presence of the protective member 15 makes it possible to provide the sound generator 1 that is excellent in waterproofing or dustproofing.

  Moreover, in the above-mentioned embodiment, the case body 12 of the magnetostrictive device 10 has a cylindrical appearance, but is not limited to such a form. The sound generator 1 may have a shape that can reduce the resistance of air generated in the sound generator 1, for example, a streamline shape.

  In the second embodiment, the connection portion 53 is provided, but the connection portion 53 is not essential. However, it is preferable to provide the connection portion 53 because it is not necessary to insert / remove the plurality of cords 52 when the helmet 50 is attached / detached with the sound generator 1 or the sound generator 90 attached to the helmet 50 or the like. The connection unit 53 may function as an amplifier that amplifies the audio signal or a distributor that separates the audio signal for each sound range.

  In the above-described embodiment, the clip 20 included in the sound generator 1 is used for fixing the magnetostrictor 10 to the visor 51. However, the clip 20 may have other uses. For example, the clip 20 may have a function of removing water droplets or dirt attached to the visor 51.

  In the above-described embodiment, in the acoustic system 100 or the acoustic system 200, the two sound generators 1 are attached to the visor 51. However, the present invention is not limited to such a form. One sound generator 1 may be attached, or three or more sound generators 1 may be attached to the visor 51.

  Moreover, in the above-mentioned embodiment, although the case where the sound generator 1 is mounted | worn with the helmet 50 is shown as an example, the sound generator 1 is installed in the cowl of a motorcycle, or a room other than the helmet 50, for example. You may make it mount | wear with other members, such as the board | plate material. Moreover, you may provide in moving bodies other than a motorcycle. Moreover, you may use for helmets 50 other than the helmet 50 for motorcycles. For example, you may use for the helmet for mounting | wearing at the construction site etc. with a loud noise. Moreover, you may make it provide the sound generator 1 in the helmet which does not have the visor 51. FIG.

  In the second embodiment, the sound generators 1 and 1 are fixed to the visor 51, and the sound generator 90 is fixed to a portion of the helmet 50 that is not the visor 51. Not exclusively. For example, the sound generators 1, 1 and the visor 51 may be provided in the visor 51, or they may be fixed to portions other than the visor 51. Moreover, it is good also as an acoustic system provided with acoustic generators other than the acoustic generator 1 and the acoustic generator 90. For example, an acoustic generator using a piezoelectric element may be used as a mid range that emits mid-range sound. Moreover, the sound generator 1 may emit not only the high sound range but also the sound in the middle sound range or the low sound range. Similarly, the sound generation device 90 may emit sound other than the low sound range.

  The sound generator of the present invention can be used in various kinds of audio equipment or industries that manufacture motorcycles.

1 is a perspective view of a sound generator according to a first embodiment of the present invention. It is a perspective view which shows the external appearance of the magnetostriction apparatus of FIG. It is sectional drawing at the time of cut | disconnecting a magnetostriction apparatus in the XZ plane containing the WW line of FIG. It is a perspective view which shows the external appearance of the acoustic system using the acoustic generator shown in FIG. It is a perspective view which shows the external appearance of the acoustic system which concerns on the 2nd Embodiment of this invention. It is sectional drawing at the time of cut | disconnecting the 2nd sound generator in the surface containing the TT line | wire of FIG. It is a perspective view of the state which cut | disconnected the sound generator in the cross section of FIG. It is a figure which shows the frequency characteristic of the acoustic generator which concerns on the 1st Embodiment of this invention, and the conventional acoustic generator. It is a figure which shows the frequency characteristic of two types of sound generators which comprise the acoustic system which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Sound generator (Sound generator, 1st sound generator), 11 ... Contact member (contact member), 12 ... Case body, 16 ... Magnetostrictive element (vibration element), 17 ... Coil (coil, 1st Coil), 20 ... Clip (fixing part), 34a ... Sticking surface, 35 ... Plate material (vibrated member), 50 ... Helmet (vibrated member), 51 ... Visor (vibrated member), 62 ... Magnet (magnetic) Element), 67 ... voice coil (second coil) 90 ... sound generator (second sound generator), 100, 200 ... sound system

Claims (5)

A coil that generates a magnetic field according to an input current;
A magnetostrictive element that expands and contracts in response to the magnetic field from the coil;
A case body in which the magnetostrictive element and the coil are accommodated;
A contact member that contacts the magnetostrictive element and protrudes from the case body;
A fixing part for fixing the case body to the member to be vibrated,
The acoustic generator according to claim 1, wherein the fixing component is fixed so that the magnetostrictive element comes into contact with the member to be vibrated through the contact member.   The sound generator according to claim 1, wherein the contact member is formed in a shape that follows a contact portion with the member to be vibrated.   The sound generator according to claim 1, wherein a gap between the case body and the contact member is covered with a protective member that prevents entry of foreign matter. A first coil that generates a magnetic field in response to an input current;
A magnetostrictive element that expands and contracts in response to a magnetic field from the first coil;
A case body that houses the magnetostrictive element and the first coil;
A contact member that contacts the magnetostrictive element and protrudes from the case body;
A fixing part for fixing the case body to the vibrating member, and fixing the magnetostrictive element so as to contact the vibrating member via the contact member;
In addition to the first sound generator comprising:
A magnetized magnetic element;
A second coil that circulates around the magnetic element with a gap therebetween;
A second sound generator comprising:
The acoustic system, wherein the second acoustic generator transmits vibration to the member to be vibrated by moving the magnetic element in accordance with a magnetic field generated by the second coil.   The acoustic system according to claim 4, wherein the vibrating member is a part of a helmet.

Images