JP2009159551A - Device for sound output - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a desktop speaker relating to a device for sound output using a desk or the like as a vibrating body. <P>SOLUTION: An output device 1 which includes an actuator 20 including a super magnetostrictive element and an enclosure unit 10 which covers the outside of the actuator 20, in which a vibration-transmitting plate 29 is set on a desk 5, and which can get sound output by transmitting the output of the actuator 20 is provided. The enclosure unit 10 includes, outside a housing 22, a cell storage section 13 in which a plurality of cells 31 are arranged around a first axis 21 and adds a weight of the plurality of cells 31 from above a housing 22 via a silicon damper 35 along the first axis 21 when the vibration-transmitting plate 29 is set on the desk 5. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sound output device using a desk or the like as a vibrating body.

  In Patent Document 1, in a speaker core and a speaker unit using the same, a counter mass using the mass of a receiving circuit, a battery, and a case is provided on one end side of the vibration element, and the vibration element is extended and driven by a drive coil. It is described that the vibration generated by this is efficiently transmitted to the diaphragm on the other end side. A typical example of a vibration element used in a speaker unit is a speaker core using a giant magnetostrictive material having quick response. This type of speaker core connects the tip of an elongated rod-shaped vibrating element made of a giant magnetostrictive material to a vibrating plate, and this vibrating element is driven to extend and contract in the axial direction by a magnetic field in the axial direction of the vibrating element generated by a magnetic field generating coil. To vibrate the diaphragm.

  Patent Document 1 further describes that the counter mass is located on the side opposite to the transmission rod provided on one end side of the vibration element and is fixed to the housing. Further, in Patent Document 1, the counter mass is for causing a displacement due to the expansion / contraction to occur only on the transmission rod side when the vibration element is driven to expand and contract. However, it is preferable that the counter mass has a mass that hardly oscillates, for example, at least about 100 to 200 times the mass of the vibration element. In other words, the counter mass expands and contracts the vibration element. It is described that it is preferable to have a mass capable of exhibiting an inertial force several hundred times as large as the force generated sometimes. Further, in order to effectively contribute the inertial force to be exerted to the vibration element (vibration thereof), the counter mass is concentrated on the central axis of the vibration element by reducing the dimension protruding in the radial direction of the vibration element as much as possible. It is described that it is preferable to provide them.

  Patent Document 2 describes providing a giant magnetostrictive speaker having good acoustic characteristics when mounted on a horizontal plane. This super magnetostrictive speaker has a bottomed and covered cylinder that constitutes a magnetic path, one end fixed to the lid of the yoke, the other end configured as a free end, and arranged in the cylindrical direction of the yoke. A giant magnetostrictive element that generates a displacement according to fluctuations, a coil that is arranged around the giant magnetostrictive element in the yoke and that generates a magnetic field according to a signal supplied from the outside, and one end is in contact with the free end of the giant magnetostrictive element The other end of the yoke passing through the central hole at the bottom is disposed so as to transmit the displacement of the giant magnetostrictive element to an external object, and a vibrating rod having a flange in the middle, and a flange provided on the vibrating rod, A rubber elastic body sandwiched between the bottom of the yoke and a super magnetostrictive element via the yoke with the other end of the vibrating rod placed on an external object so that the super magnetostrictive speaker is self-supporting. A magnetostrictive element is applied by applying a load to the mass. Displacement and a body portion to effectively transmitted to the external object.

In Patent Document 2, a preload member made of an elastic member such as a coil spring disposed between a plug at an end of a housing and a flange portion of a transmission rod in a speaker core of Patent Document 1, a rubber elastic body ( It is described that faithful vibration corresponding to a change in magnetic field can be obtained by using low-elasticity rubber or butyl rubber.
JP 2004-266307 A JP 2006-311255 A

  In an actuator that vibrates a diaphragm by driving a magnetostrictive (super-magnetostrictive) element to expand and contract in the axial direction by an axial magnetic field generated by a magnetic field generating coil, to efficiently transmit displacement due to the expansion and contraction to the rod side It is important to provide a counter mass in the axial direction. However, in such an arrangement device, the center of gravity becomes too high and becomes unstable, and it is difficult to stand on a desk or the like. Furthermore, even if the counter mass is heavier, it cannot be easily carried when it reaches a weight of several kilograms, and a device that can be easily used on a desk cannot be realized. Currently, a prototype of a vibration speaker using a giant magnetostrictive element that can be installed on a desktop is as heavy as about 2 kg. If such a weight is realized by providing a weight made of metal or the like, it also causes a cost increase.

  There is a demand for an output device that is provided with a vibration actuator that serves as a sound source such as a magnetostrictive actuator and that can be used as a vibrating body, and that can be provided at a low weight, is easy to use, and is low in cost. That is, there is a demand for an output device that is relatively lightweight, easy to carry, can be stably and easily installed on a desk, and has good sound quality.

  One aspect of the present invention is an actuator in which a rod extends downward from a vertically long housing along a first axis, and a vibration transmission plate connected to the tip of the rod is vertically displaced; an exterior unit that covers the outside of the actuator; The output device can obtain sound output by setting the vibration transmission plate on the vibrating body and transmitting the output of the actuator. The exterior unit is added to the plurality of counterweight sections around the housing when the plurality of counterweight sections arranged symmetrically about the first axis and the vibration transmission plate are set on the vibrating body. An elastic member that applies weight from the top of the housing along a first axis and a controller that receives a control signal for driving the actuator from the outside are included.

  In the output device including such an exterior unit, since the counterweight section is disposed around the housing of the actuator, the center of gravity can be lowered. Therefore, it is easy to stand on a vibrating body such as a desk. In addition, by arranging the counterweight section symmetrically about the first axis of the housing, the exterior unit including the counterweight is centered on the elastic member arranged on the housing along the first axis. The weight distribution is easy to balance. For this reason, when the vibration transmission plate is set on the vibrating body, the weight of the exterior unit including the weight applied to the plurality of counterweight sections is set along the first axis via the elastic member. Can be added to. Therefore, the weight applied to the plurality of counterweight sections can be efficiently used as an actuator countermass that displaces the vibration transmission plate up and down.

  Further, by transmitting the weight, which is arranged to balance around the housing around the first axis, to the upper portion of the housing via the elastic member, the upward movement of the actuator is caused to be the inertial force of the mass. In addition to being suppressed by the gravitational acceleration (weight), the elastic member can provide resistance to the upward movement of the actuator, and / or the elastic member can attenuate the upward movement of the actuator. As a result, the upward movement of the actuator can be more effectively suppressed. Therefore, even if the weight applied to the counterweight section is smaller, vibration can be efficiently transmitted to the diaphragm via the vibration transmission plate, sound with good sound quality and high volume can be output. For this reason, it is relatively light-weight, easy to carry, can be stably and easily installed on a desk, and can provide an output device with good sound quality.

  The exterior unit further supports the actuator by the exterior unit by mechanical connection with the actuator housing when the vibration transmission plate is separated from the vibration body, and when the vibration transmission plate is set on the vibration body, It is desirable to include a connection mechanism that releases the mechanical connection. When the output device is set on the vibrating body, the contact between the exterior unit and the actuator is limited to the elastic member disposed above the housing, so that the weight that can be used more effectively in the exterior unit is more effective. Can be added to the top of the.

  The plurality of counterweight sections preferably include at least one battery case or battery for driving the actuator. A typical counterweight section is a weight made of metal or the like. The counterweight section may be a battery case or a battery (a rechargeable battery) to which a dry battery can be attached and detached. The battery can be used as a weight and can provide a mobile type output device.

  It is desirable that the controller is disposed on the upper part of the housing of the actuator of the exterior unit. The operability can be improved by arranging the controller in the upper part. In addition, it is easier to balance the weight of the exterior unit centering on the actuator by arranging the controller in the upper part than arranging the controller around the exterior unit.

  It is desirable that the elastic member has a damper function. The movement of the upper part of the actuator can be more actively damped. A typical elastic member is a rubber sheet or a rubber block.

  A typical actuator includes a giant magnetostrictive element and a coil that generates a magnetic field around the actuator. The giant magnetostrictive element expands and contracts along the first axis by the magnetic field, and the displacement is output via a rod. This is a magnetostrictive (super magnetostrictive) actuator.

  Fig. 1 shows the outline of a desktop device (output device, output device, desktop speaker) that is small and light enough to be carried and can output sound simply by placing it on a vibrating body such as a desk. Yes. FIG. 2 shows the output device 1 as viewed from the side. FIG. 3 shows a schematic configuration of the inside of the output device 1 using a cross section. The output device 1 includes an exterior unit 10 that is covered with a vertically long and cylindrical case (housing) 11 that is designed so that the outer periphery has an intermediate appearance between a circle and a regular octagon. An acrylic vibration transmission plate 29 protrudes downward on the lower side of the output device 1. When the output device 1 is placed on the desk 5 through the vibration transmission plate 29, the top plate 5 a of the desk 5 is used as a vibrating body. Used to output sound.

  The typical size of the output device 1 is that the height (length) of the case 11 is about 80 mm and the width is about 50 mm. Even if the vibration transmission plate 29 is inserted, the overall height is about 90 mm. It is compact. As will be described later, the output device 1 can accommodate four AA type batteries (weight of about 35 g / piece), and the weight including these batteries and the actuator 20 described later is about 300 g. . In the output device reduced in weight, four AAA type batteries (weight about 15g / piece) are accommodated, and the total weight including the actuator 20 (weight about 75g) is as very light as about 200g.

  The output device 1 according to the embodiment of the present invention is very lightweight compared to the conventional table-type speaker of about 2 kg. This output device 1 is gathered in a size and weight that anyone can easily grasp with one hand, and does not include a diaphragm that generates sound such as a cone, but is on the floor, shelf, box, ceiling, desk 5, etc. You can output sound as a vibrating body just by mounting.

  The output device 1 includes an actuator 20 that vertically moves a rod 23 extending along a first shaft 21 from a vertically long housing 22, and a vibration transmitting plate 29 connected to the tip of the rod 23. And an exterior unit 10 that covers the outside. A typical actuator 20 is a giant magnetostrictive actuator including a giant magnetostrictive element 24 arranged along a first axis 21 and a magnetic field generating coil 25 arranged around the element, for example, TDK Corporation. A manufactured GMM (Giant magnetostrictive material) exciter can be employed. In the giant magnetostrictive actuator 20, a magnetic field is generated in the coil 25 by a drive signal input from the input terminal 28, whereby the giant magnetostrictive element 24 expands and contracts. The rod (actuator rod) 23 is pressed against the element 24 by the prestress spring 26 (preloaded), and the displacement of the element 24 is output via the rod 23. The housing 22 is also referred to as a yoke.

  The exterior unit 10 is a unit surrounded by an ABS case 11 and is a unit having a substantially cylindrical shape with a first axis (center axis) 21 as a center. The exterior unit 10 is disposed above the actuator housing section 12, a section (actuator housing section) 12 that houses the actuator 20 at the center, a section (battery housing section) 13 that houses the battery disposed around the exterior unit 10, and the actuator housing section 12. And a section 14 for accommodating the control unit 40.

  The control unit 40 includes a wireless transmission / reception unit 41 for wirelessly transmitting / receiving data and a controller 43 for performing various controls relating to sound output. A typical wireless transmission / reception unit 41 is a Bluetooth communication module or an 800 MHz band wireless module. A communication antenna may be built in, or an external antenna may be connected. The functions provided by the controller 43 are volume adjustment, mute, sound data selection function provided by a plurality of channels, and the like. These functions can be operated from the control panel 45 provided on the upper surface of the case 11. The control unit 40 may include a microphone and a sound collection module that provides services associated with sound collection such as echo cancellation. The control unit 40 may include a module that provides a sound source such as an MP3 player. The control unit 40 may further include other interfaces such as a wireless LAN and a wired LAN.

  In FIG. 4, the cross section which cut the part containing the battery accommodating section 13 of the exterior unit 10 in the horizontal direction is shown. The battery storage section 13 can store four batteries 31 at the positions of the respective vertices of a square that is symmetrical about the axis 21. As shown in FIG. 5, the battery storage section 13 is exposed by removing the lower half of the case 11, and the four batteries 31 can be attached and detached. The attachment / detachment structure of the battery 31 is not limited to this. These batteries 31 may be of a charge type, and the control panel 45 can be provided with an interface with a power adapter.

  FIG. 6 shows a state where the actuator 20 is housed in the actuator housing section 12 of the exterior unit 10. The actuator 20 is housed in the actuator housing section 12 in a state where a silicon rubber sheet (silicon damper) 35 having a thickness of about 1 mm is set on the housing 22. An acrylic vibration transmission plate 29 is set at the lower end of the rod 23 protruding downward from the actuator 20. The vibration transmission plate 29 includes a disk-shaped grounding part 29a having a diameter of about 30 mm and a rod storage part 29b provided on the grounding part 29a. The silicon damper 35 has a disk shape with a diameter of about 20-25 mm, and is provided with a slit 36 through which the input terminal 28 protruding upward from the upper part 22a of the housing 22 of the actuator 20 is provided.

  When the actuator 20 is housed in the actuator housing section 12 of the exterior unit 10, the input terminal 28 passes through the silicon damper 35 and enters the interface portion (terminal block) 15 disposed below the control unit housing section 14. The actuator 20 is electrically connected to the controller stored in the control unit storage section 14. Further, when the vibration transmission plate 29 is set (mounted) on the desk 5, the upper end 22 a of the housing 22 of the actuator 20 hits (contacts) the ceiling portion 12 a of the actuator housing section 12 via the silicon damper 35. .

  The shape of the case 11 of the exterior unit 10 and the internal arrangement of the sections 13 and 14 are arranged so as to have a symmetrical load distribution around the axis 21. The actuator 20 is also configured to have a symmetrical load distribution around the axis (first axis) 21. Therefore, the output device 1 is self-supporting when the vibration transmission plate 29 protruding from the actuator 20 is set on the desk 5 below the central shaft 21. Further, the battery storage section 13 is provided around the actuator storage section 12, and the weight of the battery 31 set in the battery storage section 13 has a significant influence on the main weight or balance of the exterior unit 10. Therefore, it becomes a low position close to the center of gravity of the entire actuator 20 of the output device 1 itself. Therefore, the output device 1 becomes stable and independent by setting the vibration transmission plate 29 on the desk 5.

  The actuator housing portion 12 of the exterior unit 10 has an inner diameter slightly larger than the outer diameter of the housing 22 of the actuator 20, and there is a slight gap between the side wall portion 12 b of the actuator housing portion 12 of the case 11 and the actuator 20. A gap 39 is opened. The length (height) of the actuator housing portion 12 is set slightly longer than the length (height) obtained by adding the silicon damper 35 to the housing 22 of the actuator 20. That is, the lower end portion 12c of the actuator housing portion 12 of the case 11 projects inward so that a space through which the rod 23 passes is sufficiently secured, and can support the lower side 22b of the housing 22 of the actuator 20. ing. The length between the inside of the protruding portion 12c at the lower end and the ceiling portion 12a is set slightly longer than the length of the housing 22 of the actuator 20 plus the thickness of the silicon damper 35. Therefore, when the output device 1 is self-supported with the vibration transmission plate 29 facing down, the upper end 22a of the housing 22 of the actuator 20 hits the ceiling portion 12a via the silicon damper 35, and the lower end 22b of the housing 22 and the overhanging portion 12c A gap 39 is opened between the two.

  Therefore, when the output device 1 is self-supported with the vibration transmission plate 29 facing down, only the upper part (upper end) 22 a of the housing 22 is connected to the exterior unit 10 except for the connection of the input terminal 28. For this reason, almost the entire weight of the exterior unit 10 is added to the upper portion of the housing 22 via the silicon damper 35. Of the total weight of the exterior unit 10, the proportion of the weight of the batteries 31 arranged symmetrically around the central axis 21 in the battery housing section 13 is large. Therefore, first, the weight (mass) of the battery 31 arranged symmetrically around the first shaft 21 around the housing 22 serves as a counterweight for the actuator 20 via the silicon damper 35. And acts (applied) from the upper part 22a of the housing 22. Further, since the main mass (weight) is symmetrically arranged around the central axis 21, other weights (mass) of the exterior unit 10 excluding the battery 31 are also balanced around the central axis 21, and the battery 31 Together with the weight, it acts from the upper part 22a of the housing 22 along the first shaft 21 as a counterweight for the actuator 20 via the silicon damper 35.

  On the other hand, when the output device 1 is lifted away from the desk 5 by holding the outside of the case 11 or the like, the upper side 22a of the housing 22 of the actuator 20 is separated from the ceiling portion 12a and The side 22b hits the overhanging portion 12c and supports the actuator 20. Therefore, in this output device 1, the protruding portion 12 c on the lower side of the actuator housing section 12 of the case 11 is a mechanical connection mechanism between the exterior unit 10 and the actuator 20. That is, when the vibration transmission plate 29 is separated from the vibrating body such as the desk 5, the housing 22 of the actuator 20 is mechanically connected by the protruding portion 12 c and the actuator 20 can be supported by the exterior unit 10. On the other hand, when the vibration transmission plate 29 is set on the desk 5, a gap 39 is opened between the actuator 20 and the overhanging portion 12c, and the mechanical connection between the actuator 20 and the overhanging portion 12c is released. .

  For this reason, when carrying the output device 1, the actuator 20 can be supported by the exterior unit 10, and when the output device 1 is set on the desk 5 to produce sound, the mass of the exterior unit 10 is used as the counter mass of the actuator 20. Available. Further, in this usage pattern, the actuator 20 vibrates in the vertical direction, so that the weight of the exterior unit 10 due to gravitational acceleration can be used as the counterweight of the actuator 20. Therefore, the displacement of the actuator 20 (extension and contraction of the giant magnetostrictive element 24) can be efficiently transmitted to the vibration transmission plate 29 via the rod 23. Therefore, vibration for generating sound can be efficiently transmitted from the output device 1 to the desk 5, and a sound with high sound quality and high sound quality can be output via the desk 5 (the top plate 5a of the desk 5).

  Further, the exterior unit 10 causes the weights of the plurality of batteries 31 arranged symmetrically around the central axis 21 to act on the upper end 22a of the housing 22 of the actuator 20 via the ceiling portion 12a. A structure such as a doubly-supported beam (balance) in which the weight of the battery 31 is on both sides of the ceiling portion 12a is effective for lowering the center of gravity of the output device 1, and the ceiling portion 12a has a spring (plate spring, It acts as a leaf spring or a flat spring, and is effective in suppressing or attenuating the vibration of the battery 31 due to the vibration applied to the ceiling portion 12a. Therefore, the situation where the exterior unit 10 resonates (resonates) with the vibration output from the actuator 20 can be suppressed, and the upward movement of the actuator 20 can be further suppressed.

  Further, the weight of the exterior unit 10 is applied to the actuator 20 via the silicon rubber sheet 35. The silicon rubber sheet (silicon damper) 35 is an elastic member and further includes a function of damping vibration (damper function, damping action). The elastic force of the silicon damper 35 is a resistance force against the upward movement of the actuator 20. Further, the upward movement of the actuator can be attenuated by the silicon damper 35. Therefore, the upward movement of the actuator 20 can be effectively suppressed. Although the weight of the vibration element itself included in the actuator 20 is not clear, according to the inventors' prototype, it is not necessary to prepare a mass (weight) several hundred times that of the vibration element 24 as a counter mass (counterweight). The displacement due to the expansion and contraction of the vibration element 24 can be efficiently output from the lower rod 23 of the actuator 20 only by preparing a mass (weight) of several tens of times or less as a counter mass (counter weight). is assumed. For this reason, the total weight of the output device 1 can be suppressed to about several hundred grams. Instead of the silicon rubber sheet 35, a low elastic rubber sheet, a butyl rubber sheet, or the like can be used. Although the thickness of the silicon rubber sheet 35 is not limited to 1 mm, the displacement output from the actuator 20 varies depending on the frequency or the like, but a maximum effect is about several μm, so a sufficient effect can be obtained with a sheet of about 1 mm. A rubber block may be used instead of the silicon rubber sheet.

  Thus, the output device 1 is a movable and wireless speaker device that can be operated by the battery 31. Furthermore, since the output device 1 is light and about several hundred grams including the battery 31, it is easy to carry. As long as the output device 1 such as a desk, a shelf, a floor, or a ceiling can be mounted, the sound can be output using almost anything as a vibrating body, and a sound with sufficient sound volume and excellent sound quality can be output even if it is lightweight. it can. For this reason, the output device 1 can be used for various purposes and scenes. For example, if this output device 1 is used, different music and voice can be output for each desk. For this reason, in a cafe, a restaurant, etc., the output device 1 is installed for every table, and the music which a user likes can be output as BGM. Further, since audio can be output for each table by the output device 1 in a conference hall, event hall, seminar hall, etc., a loud speaker that is harsh and loud is unnecessary. It is also possible to install the output device 1 on the ceiling of each booth at an event venue or an exhibition hall to flow guidance for each booth. It is also possible to use the output device 1 as a remote audio output of a television at home. Further, the output device 1 equipped with a microphone function can be used as a video conference audio terminal or a hands-free communication terminal. These utilization methods are only examples of utilization methods of the output device 1.

  FIG. 7 shows a different example of the output device. The output device 1 also includes a giant magnetostrictive actuator 20 and an exterior unit 10 that covers the outside. The exterior unit 10 includes a case 11, and the case 11 includes an actuator storage section 12, a battery storage section 13, and a control unit storage section 14. A hemispherical protrusion 27 is provided on the extended line of the first shaft 21 at the upper end 22 a of the housing 22 of the actuator 20. When the vibration transmission plate 29 protruding downward from the actuator 20 is set on the desk 5, the actuator 20 is connected to the ceiling portion of the actuator storage section 12 via the protrusion 27 and the silicon rubber damper 35 disposed thereon. Hit 12a. Therefore, almost the entire weight of the exterior unit 10 acts on (adds to) the upper end of the hemispherical protrusion 27 and on the line of the first shaft 21.

  In such an arrangement, since the weight of the battery 31 stored in the battery storage section 13 is concentrated and transmitted along the first shaft 21, the magnetostrictive element that expands and contracts vertically along the shaft 21 is displaced upward. And the output of the magnetostrictive element can be transmitted more efficiently downward. Also, in this arrangement, particularly when considering the transmission of weight by the ceiling portion 12a, the ceiling portion 12a is used as a beam, weights are arranged on both sides of the beam, and the center of the beam is a hemispherical shape on the actuator 20. Since it is supported by the protrusions 27, it is arranged more like a both-end supported beam or a balance. Therefore, it can be further expected that the ceiling portion 12a functions like a leaf spring. The case 11 is formed of a highly rigid resin such as ABS or a light and highly rigid metal such as aluminum. In addition to the resistance and damping function of the silicon damper 35, the case 11 having such a structure can be used. The resonance of the exterior unit 10 can be suppressed. For this reason, the output (vibration force, vibration energy) of the actuator 20 can be transmitted to a vibrating body such as the desk 5 below, and sound can be output efficiently.

  Further, the protrusion 27 protruding in a hemispherical shape comes into contact with a block or sheet 35 made of silicon rubber, and the side of the silicon rubber sheet 35 is adapted to the shape of the protrusion 27 (along the shape) and deformed. For this reason, the weight balance (mass balance) of the exterior unit 10 is not completely symmetric with respect to the first axis (center axis) 21, and even if there is a minute deviation (bias), it is upward with respect to the center axis 21. Thus, it is possible to stably realize the state in which the exterior unit 10 is supported by the actuator 20 in a state where the weight of the exterior unit 10 acts in the vertical direction along the central axis 21. That is, by setting the output device 1 on the desk 5, the state of the exterior unit 10 is automatically set so that the center of gravity 10g of the exterior unit 10 is aligned on the axis of the central axis 21 passing through the center of gravity 20g of the actuator 20. Can be set. Therefore, the weight of the exterior unit 10 can be concentrated to act as a counterweight with respect to the displacement of the element 24 that expands and contracts vertically along the central axis 21 of the actuator 20. Therefore, it is possible to provide the output device 1 that is relatively light and easy to carry, can be stably and easily installed on a desk, and has good sound quality.

  Further, in the output device 1 shown in FIG. 7, an arm 37 that is fixed to the upper part 22 a of the housing 22 of the actuator 20 by a dedicated part and protrudes upward from the housing 22 is provided. The arm 37 passes through the ceiling portion 12a of the actuator storage section 12, and the tip 37a through which the arm 37 penetrates spreads. The arm 37 moves up and down with respect to the ceiling portion 12a. The arm 37 does not come off the ceiling portion 12a, and the actuator 20 can be supported by the ceiling portion 12a. Therefore, in this output device 1, the arm 37 functions as a connection mechanism, and when the vibration transmission plate 29 is separated from the vibrating body such as the desk 5, the upper end 37 a of the arm 37 engages with the ceiling portion 12 a and the housing of the actuator 20. The actuator 20 is supported by the exterior unit 10. When the vibration transmission plate 29 is set on the vibrating body, the upper end 37a of the arm 37 is detached from the ceiling portion 12a, and the mechanical connection between the actuator 20 and the exterior unit 10 can be released. In addition, the same code | symbol is attached | subjected about the part which is common in the output device shown in FIG. 3, and description is abbreviate | omitted.

  In these output devices 1, the battery 31 is used as a counterweight (counter mass), but a weight made of metal or the like may be arranged. By using the battery 31 as a counterweight, a cableless speaker can be realized and an increase in unnecessary weight can be suppressed. Therefore, using the battery 31 as a counterweight is one of the most preferable modes. Further, the arrangement of the plurality of batteries 31 in the battery storage section 13 is not limited to being arranged at each vertex of a square centering on the central axis 21 as described above. You may arrange | position the two dry batteries 31 in the symmetrical position with respect to the central axis 21. FIG. Three dry batteries 31 may be arranged at each vertex of an equilateral triangle with the central axis 21 as the center. Four dry batteries 31 may be arranged at each vertex of a rectangle centered on the central axis 21. Further, a plurality of dry batteries 31 may be arranged at each vertex of a regular polygon with the central axis 21 as the center.

  In addition to the giant magnetostrictive actuator, examples of the actuator that can control the expansion and contraction of the element by a signal include a piezo type actuator in which the element expands and contracts by a voltage.

The perspective view which shows the outline | summary of an output device. The side view of an output device. Sectional drawing of the perpendicular direction which shows schematic structure of an output device. FIG. 3 is a horizontal cross-sectional view showing the arrangement of batteries. The figure which shows a mode that a battery is attached or detached. The figure which expand | deploys and shows the state which accommodates an actuator. Sectional drawing which shows the example from which an output device differs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Output device (desktop speaker), 5 Desk 10 Exterior unit, 11 Case 20 Actuator, 21 First axis (center axis), 22 Housing 23 Rod, 29 Vibration transmission plate 31 Dry cell, 35 Silicon damper (silicone rubber sheet)

Claims (7)

An actuator that extends downward from a vertically long housing along a first axis, and that vertically displaces a vibration transmission plate connected to the tip of the rod;
An exterior unit that covers the outside of the actuator,
An output device capable of obtaining a sound output by setting the vibration transmission plate on a vibrating body and transmitting the output of the actuator,
The exterior unit includes a plurality of counterweight sections arranged around the housing and symmetrically about the first axis;
An elastic member for applying a weight applied to the plurality of counterweight sections from above the housing along the first axis when the vibration transmitting plate is set on the vibrating body;
A controller for receiving a control signal for driving the actuator from outside. The exterior unit according to claim 1, further comprising:
When the vibration transmitting plate is separated from the vibrating body, the actuator is supported by the exterior unit by mechanical connection with the housing of the actuator, and when the vibration transmitting plate is set on the vibrating body, An output device including a connection mechanism for releasing a mechanical connection with an actuator.   The output device according to claim 1 or 2, wherein the plurality of counterweight sections include at least one battery case or battery for driving the actuator.   4. The output device according to claim 1, wherein the controller is disposed on an upper portion of the housing of the actuator of the exterior unit.   The output device according to claim 1, wherein the elastic member has a damper function.   6. The output device according to claim 1, wherein the elastic member is a rubber sheet or a rubber block.   The output device according to claim 1, wherein the actuator is a magnetostrictive actuator.

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