WO2018216525A1

WO2018216525A1 - Vibration transmission device and vibration transmission method

Info

Publication number: WO2018216525A1
Application number: PCT/JP2018/018495
Authority: WO
Inventors: 英樹奈良; 将士青山
Original assignee: パイオニア株式会社; 株式会社テック・エキスパーツ
Priority date: 2017-05-24
Filing date: 2018-05-14
Publication date: 2018-11-29
Also published as: JPWO2018216525A1

Abstract

When a vibration transmission device (100) is mounted to a steel board (BD) by mounting members (121, 122), a vibration transmission member (140) is closely attached to the steel board (BD). When a sound source device (500) sends a sound signal in this state, a sound signal of analog signal is generated in the vibration transmission device (100). After a power amplification unit amplifies the sound signal, an output signal is supplied to a vibration actuator. In the vibration actuator, a voice coil vibrates in response to the output signal, and a support cap generates vibration accompanied by a sound wave. When the support cap vibrates, the vibration transmission member (140) affixed to the support cap vibrates. The vibration of the vibration transmission member (140) is transmitted to the steel board (BD). As a result, the steel board (BD) vibrates air, and outputs sound to external space.

Description

Vibration transmission device and vibration transmission method

The present invention relates to a vibration transmission device and a vibration transmission method.

In recent years, attention has been paid to a vibration transmission device that is attached to an external member such as a wall, transmits vibration corresponding to an acoustic signal to the external member, and generates sound from the external member. By using such a vibration transmission device, it has become possible to enjoy music without being aware of the presence of a speaker.

As a technique proposed regarding such a vibration transmission device, for example, there is a technique in which a vibration unit vibrates an external member that can come into contact with the vibration unit to generate sound from the external member (see Patent Document 1 below). , Called “conventional example”). In this prior art technique, a permanent magnet mounting member provided in the housing of the apparatus is magnetically attracted to an external member of the magnetic member, and the vibrating portion is pressed against the external member of the magnetic member by the magnetic force of the permanent magnet. . Then, the vibration part is deformed by applying a sound signal to the vibration part, and the external member is vibrated by the deformation of the vibration part to generate sound from the external member.

Japanese Patent Laying-Open No. 2015-192241

In the above-described conventional technology, the vibrating portion is brought into contact with an external member by using the magnetic attraction force of an attachment member (permanent magnet) disposed around the vibrating portion. However, in such a configuration of the apparatus, there is a case where a period in which the vibration unit and the external member are not in contact with each other occurs instantaneously due to the relationship with the vibration frequency of the vibration unit. For this reason, compared with the case where the constant contact of a vibration part and an external member is ensured, in the technique of a prior art example, the vibration transmission efficiency to the external member of the vibration of a vibration part falls. As a result, in the conventional technique, the volume of sound generated from the external member is reduced, the sound quality is deteriorated, and the frequency band is narrowed.

For this reason, a technique that can vibrate an external member and generate high-quality sound from the member is desired. Meeting this requirement is one of the problems to be solved by the present invention.

The invention according to claim 1 is a vibration transmission device that can be attached to an external member, and a vibration actuator that vibrates a vibration unit according to a signal supplied from outside; a vibration transmission member fixed to the vibration unit; A housing member that houses the vibration actuator; an attachment member that attaches the housing member to the external member, and the housing member is attached to the external member by the attachment member, The vibration transmission member is a vibration transmission device that is attached in close contact with the external member.

The invention according to claim 8 is a vibration actuator; a vibration transmission member fixed to a vibration portion of the vibration actuator; a housing member that houses the vibration actuator; and an attachment member that attaches the housing member to an external member And a vibration transmission method used in a vibration transmission device attachable to the external member, wherein the vibration transmission member is attached to the external member by the attachment member. An acquisition step of acquiring a signal supplied from the outside in a state of being closely attached to the external member; and according to the signal acquired in the acquisition step, the vibration unit vibrates, and the vibration transmission member is A vibration transmission step of transmitting the vibration of the vibration part to the external member by vibrating in conjunction with the vibration of the vibration part. That is a vibration transmission method.

DESCRIPTION OF SYMBOLS 100 ... Vibration transmission device 110 ... Housing member 121,122 ... Mounting member 130 ... Vibration actuator 139 ... Support cap (vibration part)
140 ... vibration transmission member 151 ... signal processing unit (circuit parts)
BD ... External member

1 is an external view of a vibration transmission device according to an embodiment of the present invention. It is a figure for demonstrating the external view and usage example of the apparatus of FIG. FIG. 2 is an internal view of the apparatus of FIG. 1. FIG. 2 is a cross-sectional view of the apparatus of FIG. It is a figure for demonstrating the cover part of FIG. FIG. 4 is an exploded perspective view of the vibration actuator of FIG. 3 and a diagram for explaining a vibration transmission member fixed to the vibration actuator. It is a block diagram which shows the structure of the vibration signal generation part of FIG. It is a figure for demonstrating the vibration transmission to the steel board by the apparatus of FIG.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. In the following description and drawings, the same or equivalent elements are denoted by the same reference numerals, and redundant description is omitted.

[Constitution]
1A and 1B are external views of a vibration transmission device 100 according to an embodiment. Here, the coordinate system (X, Y, Z) used in this embodiment is defined as shown. FIG. 1A is a perspective view showing the vibration transmitting device 100 in the coordinate system shown in FIG. FIG. 1B is a plan view of the vibration transmitting device 100 viewed from the + Z direction side.

FIG. 2 shows an external view of the vibration transmitting device 100 attached to a magnetic steel board BD (external member). Here, FIG. 2 is a plan view of the vibration transmission device 100 as viewed from the + X direction side, and shows an example of use of the vibration transmission device 100. Examples of the steel board BD include a white board, an office wall and ceiling, and a file cabinet.

FIG. 3 shows an internal view of the vibration transmitting device 100. FIG. 3 is a plan view of the inside of the vibration transmitting device 100 as viewed from the + Z direction side. Further, FIGS. 4A and 4B are cross-sectional views of the vibration transmitting device 100. FIG. 4A is a cross-sectional view of the vibration transmission device 100 taken along the line AA (see FIG. 1B) when viewed from the + X direction side, and FIG. 4B shows the vibration transmission device 100. FIG. 5 is a cross-sectional view taken along the line BB (see FIG. 1B) viewed from the −Y direction side.

As comprehensively shown in FIGS. 1 (A), 1 (B) to 4 (A), (B), the vibration transmitting device 100 includes a housing member 110 and mounting

members

121, 122. . The vibration transmission device 100 includes a vibration actuator 130, a vibration transmission member 140, and a vibration signal generation unit 150. Note that the vibration signal generation unit 150 is not illustrated in FIG.

<Configuration of casing member 110>
The configuration of the casing member 110 will be described. The housing member 110 is a hollow rectangular parallelepiped member, as comprehensively shown in FIGS. 1 (A), 1 (B) to 4 (A), 4 (B), and includes a vibration actuator 130 and vibration signal generation. The unit 150 is fixed and stored. The casing member 110 includes a casing main body 111 and a lid 112. The lid 112 is attached to the housing main body 111 with a screw or the like (not shown). Note that FIG. 3 described above is an internal view of the vibration transmitting device 100 that appears when the lid 112 is virtually removed from the housing main body 111.

The lid portion 112 is a rectangular member. As shown in FIG. 5, a circular opening HL for projecting the vibration transmission member 140 fixed to the vibration actuator 130 to the outside is formed in the lid 112 at the center of the rectangular surface. . In addition, four screw insertion holes SH1 to SH4 for fixing the vibration actuator 130 to the housing member 110 are formed at substantially equal intervals around the circular opening HL in the lid portion 112. Here, FIG. 5 is a plan view of the lid 112 removed from the housing main body 111 when viewed from the + Z direction side.

<Mounting

members

121 and 122>
The mounting

members

121 and 122 will be described. As shown in FIGS. 1A, 1B, 4A, 4B, and 5 in a comprehensive manner, the

attachment members

121, 122 are long plates having a predetermined thickness in this embodiment. Shaped neodymium magnet. The attachment member 121 is fixed to the lid portion 112 with a screw or the like (not shown) at an end portion on the −Y direction side of the surface on the + Z direction side of the lid portion 112 so that the extending direction is the X-axis direction. The attachment member 122 is fixed to the lid portion 112 by a screw or the like (not shown) at the end portion on the + Y direction side of the surface on the + Z direction side of the lid portion 112 so that the extending direction is the X-axis direction.

<Configuration of vibration actuator 130>
The configuration of the vibration actuator 130 will be described. In the present embodiment, the vibration actuator 130 includes a yoke 131, a first magnet 132, a plate 133, and a second as shown in FIGS. 3, 4A, 6B and 6 as a whole. And a magnet 134. The vibration actuator 130 includes a frame assembly 135, a voice coil 136, a terminal 137, a damper 138, and a support cap 139. Here, FIG. 6 is an exploded perspective view of the vibration actuator 130. Then, after combining the elements of the vibration actuator 130 shown in the exploded perspective view of FIG. 6, the configuration of the vibration actuator 130 housed in the housing member 110 is shown in FIGS. 3, 4 </ b> A, and 4 </ b> B. Is shown in

The yoke 131 is a cylindrical member having a bottom and serves as a base of the vibration actuator 130. The first magnet 132 is a disk-shaped magnet member having an outer diameter shorter than the inner diameter of the yoke 131 and is disposed at the bottom of the yoke 131. The plate 133 is a disk-shaped member made of a magnetic material having an outer diameter shorter than the inner diameter of the yoke 131, and is laminated on the disk surface on the + Z direction side of the first magnet 132. The second magnet 134 is a disk-shaped magnet member having an outer diameter shorter than the inner diameter of the yoke 131 and is laminated on the disk surface of the plate 133 on the + Z direction side. The first magnet 132, the plate 133 and the second magnet 134 stacked in this way are fixed inside the yoke 131. The yoke 131, the first magnet 132, the plate 133, and the second magnet 134 form a magnetic circuit.

The frame assembly 135 supports the magnetic circuit of the vibration actuator 130 and the vibration system including the voice coil 136, the damper 138, and the support cap 139, and fixes the vibration actuator 130 to the housing member 110. The frame assembly 135 is molded and processed into a structure having four columnar portions CY1 to CY4 arranged at substantially equal intervals and a terminal mounting portion TM to which the terminal 137 is attached on the outer peripheral portion of the annular member. Yes.

Here, a screw insertion hole for fixing the vibration actuator 130 to the casing member 110 is formed in the center of the cylindrical portions CY1 to CY4. Then, by using the screw insertion holes SH1 to SH4 formed in the lid portion 112 and the screw insertion holes formed in the columnar portions CY1 to CY4, screwing is performed, so that the vibration actuator 130 becomes the housing member 110. (See FIGS. 4A and 4B).

The voice coil 136 includes a cylindrical bobbin and a coil wound around the outer peripheral surface of the bobbin. The voice coil 136 is arranged such that the outer peripheral portion of the voice coil 136 is spaced from the inner peripheral surface of the yoke 131 by a damper 138 formed of an elastic member, and the inner peripheral portion of the voice coil 136. Are arranged to have a predetermined distance from the first magnet 132, the plate 133, and the second magnet 134.

Terminal 137 is attached to frame assembly 135. The terminal 137 is configured to output the output signal to the voice coil 136 via a lead wire when an output signal (electric signal) sent from a power amplification unit described later is input. The voice coil 136 that has received the output signal from the power amplifier in this way vibrates in the Z-axis direction by the output signal and the magnetic force of the magnetic circuit.

The support cap 139 is molded into a structure in which a disk portion is attached to the + Z direction side of a substantially conical hollow member whose bottom is the −Z direction side. The support cap 139 is attached to the voice coil 136 on the −Z direction side, and generates vibration in the Z-axis direction in accordance with the vibration of the voice coil 136. Here, the support cap 139 corresponds to the vibrating portion.

<Vibration transmission member 140>
The vibration transmission member 140 will be described. The vibration transmitting member 140 is a disc-shaped neodymium magnet as comprehensively shown in FIGS. 1 (A), (B) to FIGS. 4 (A), (B) and FIG. The vibration transmission member 140 is fixed to the disk portion on the + Z direction side of the support cap 139 of the vibration actuator 130. When the support cap 139 vibrates, the vibration transmission member 140 vibrates in conjunction with the vibration of the support cap 139.

Here, when the vibration actuator 130 to which the vibration transmission member 140 is fixed is housed in the housing member 110, the vibration transmission member 140 projects outside the housing member 110 through the opening HL of the lid portion 112. It is arranged so that. The length of the portion of the vibration transmitting member 140 protruding outward from the housing member 110 on the + Z direction side is substantially the same as the thickness of the mounting

members

121 and 122 in the Z-axis direction (FIGS. 2 and 2). 4 (A) and (B)).

That is, when the vibration transmission device 100 is attached to the steel board BD made of a material that can be attracted to the magnet using the

attachment members

121 and 122, the thickness is such that the steel board BD can also be attracted to the vibration transmission member 140. The vibration transmission member 140 has. Further, the thickness of the

attachment members

121 and 122 and the thickness of the vibration transmission member 140 are determined when the support cap 139 and the vibration transmission member 140 vibrate in a state where the housing member 110 is attached to the steel board BD. The housing member 110 is set so as not to contact the steel board BD. When the casing member 110 is attached to the steel board BD by the

attachment members

121 and 122, the vibration transmission member 140 is attached in close contact with the steel board BD.

Note that the portion of the opening HL of the lid 112 that is not occupied by the vibration transmission member 140 is covered with an annular cover CV in a mode that does not inhibit the vibration of the vibration transmission member 140 (FIG. 1A, (See (B)).

In this embodiment, the disk-shaped shape of the vibration transmitting member 140 is the same as the disk portion of the support cap 139 in order to efficiently transmit the vibration of the support cap 139 to the steel board, and is in contact with the steel board BD. The area is not expanded. Further, each of the attachment member 121 and the attachment member 122 is disposed at the end portion on the −Y direction side and the end portion on the + Y direction side of the lid portion 112, and the vibration transmitting member 140 is the most from both the

attachment members

121 and 122. It arrange | positions so that it may become the center of the separated cover part 112. FIG. Thus, the

attachment members

121 and 122 and the vibration transmission member 140 in the present embodiment are arranged so that the vibration transmission efficiency of the vibration transmission member 140 (support cap 139) to the steel board BD is high.

The contact area of the vibration transmission member 140 with the steel board BD and the contact area of the mounting

members

121 and 122 with the steel board BD are determined by the vibration transmission device 100 when the vibration transmission member 140 vibrates. From the standpoint of keeping it from falling outside, it is determined in advance based on experiments, simulations, experiences, and the like. Then, on condition that the vibration transmission device 100 is attached to the steel board BD when the vibration transmission member 140 vibrates, the contact area of the vibration transmission member 140 with the steel board BD and the steel in the

attachment members

121 and 122 are the same. The contact area with the board BD is set to be small.

<Configuration of Vibration Signal Generation Unit 150>
The vibration signal generation unit 150 is configured by a part of circuit components connected to the vibration actuator 130. As illustrated in FIG. 7, the vibration signal generation unit 150 includes a signal processing unit 151 and a battery unit 159 (not illustrated in FIG. 3). Here, FIG. 7 is a block diagram illustrating a configuration of the vibration signal generation unit 150. The signal processing unit 151 corresponds to a circuit component.

The signal processing unit 151 includes a wireless communication unit 152, a control unit 153, a digital / analog conversion unit (DAC) 154, and a power amplification unit (PA) 155.

The wireless communication unit 152 includes an antenna (not shown) and the like. Under the control of the control unit 153, Bluetooth (registered trademark; hereinafter referred to as “BT”) is connected to the external sound source device 500. (Note) Communicate. When a radio signal carrying sound data (sound signal) transmitted from the sound source device 500 is received by BT communication, the radio communication unit 152 converts the received radio signal into a digital signal that can be processed by the control unit 153. The converted signal is sent to the control unit 153.

The control unit 153 performs wireless communication control processing on the wireless communication unit 152 for receiving sound data transmitted from the sound source device 500. Upon receiving the digital signal transmitted from the wireless communication unit 152, the control unit 153 receives a digital sound signal (hereinafter referred to as “digital sound signal”) corresponding to the sound data included in the digital signal. To the DAC 154.

The DAC 154 receives the digital sound signal sent from the control unit 153. Subsequently, the DAC 154 converts the digital sound signal into an analog sound signal in an analog format. Then, the DAC 154 sends an analog sound signal to the power amplification unit 155.

The power amplification unit 155 receives the analog sound signal sent from the DAC 154. Then, the power amplifier 155 amplifies the analog sound signal and supplies the output signals S1 and S2 for driving the vibration actuator 130 with a differential output to the vibration actuator 130. As a result, the vibration actuator 130 and the vibration transmission member 140 vibrate according to the output signals S1 and S2.

The battery unit 159 includes a rechargeable and replaceable storage battery. The battery unit 159 supplies operating power to the signal processing unit 151.

[Operation]
The operation of the vibration transmission device 100 configured as described above will be described mainly focusing on the vibration transmission processing linked to the vibration of the vibration actuator 130.

As a premise, it is assumed that the vibration transmission device 100 is attached to the steel board BD by

attachment members

121 and 122 as shown in FIG. At this time, the vibration transmission member 140 is attracted to the steel board BD, and the vibration transmission member 140 is attached in close contact with the steel board BD.

In this state, when the sound source device 500 transmits a wireless signal carrying sound data by BT communication, the wireless communication unit 152 of the vibration signal generation unit 150 in the vibration transmitting device 100 transmits the wireless signal transmitted from the sound source device 500. The received radio signal is converted into a digital signal that can be processed by the control unit 153. Next, the control unit 153 and the DAC 154 sequentially perform processing to generate an analog sound signal. Then, the power amplifier 155 amplifies the analog sound signal sent from the DAC 154, and then supplies the output signals S1 and S2 to the vibration actuator 130.

In the vibration actuator 130, the output signals S 1 and S 2 sent from the power amplifier 155 are input to the voice coil 136 via the terminal 137. When receiving the output signal sent from the power amplifier 155 in this way, the voice coil 136 vibrates due to the interaction between the magnetism accompanied by the current generated in response to the output signal and the magnetism of the magnetic circuit. The support cap 139 attached to the voice coil 136 vibrates according to the vibration of the voice coil 136.

Thus, when the support cap 139 vibrates, the vibration transmitting member 140 fixed to the support cap 139 and attached to the steel board BD vibrates in conjunction with the vibration of the support cap 139. When the vibration transmitting member 140 vibrates, the vibration of the vibration actuator 130 (support cap 139) is transmitted to the steel board BD.

As a result, the steel board BD functions as a diaphragm and vibrates according to the sound signal, and the steel board BD vibrates air and outputs sound to the external space.

As described above, in this embodiment, when the vibration transmission device 100 is attached to the steel board BD by the

attachment members

121 and 122, the vibration transmission member 140 is attached in close contact with the steel board BD. In this state, when the sound source device 500 transmits a radio signal carrying sound data to the vibration transmission device 100, the wireless communication unit 152 is transmitted from the sound source device 500 in the vibration signal generation unit 150 of the vibration transmission device 100. Receive radio signals. Next, in the vibration signal generation unit 150, the control unit 153 and the DAC 154 sequentially perform processing to generate an analog sound signal. Then, the power amplifier 155 amplifies the analog sound signal and then supplies the output signals S1 and S2 to the vibration actuator 130.

In the vibration actuator 130, the voice coil 136 that has received the output signal sent from the power amplifier 155 vibrates due to the interaction between the magnetism accompanied by the current generated according to the output signal and the magnetic force of the magnetic circuit. The support cap 139 vibrates according to the vibration of the voice coil 136.

Thus, when the support cap 139 vibrates, the vibration transmitting member 140 fixed to the support cap 139 and attached to the steel board BD vibrates in conjunction with the vibration of the support cap 139. When the vibration transmission member 140 vibrates, the vibration of the vibration actuator 130 is transmitted to the steel board BD. The steel board BD functions as a so-called speaker diaphragm, vibrates air according to the sound signal of the sound source device 500, and outputs sound to the external space.

Here, in the present embodiment, the vibration transmitting member 140 employs a disc-shaped neodymium magnet. For this reason, the vibration transmission member 140 is attracted to the steel board BD, so that the vibration transmission member 140 is attached in close contact with the steel board BD. Even if it is instantaneous, the vibration transmission member 140 and the steel board BD are connected. There is no divergence. For this reason, it can suppress that the vibration transmission efficiency to the steel board BD of the vibration of the vibration actuator 130 falls. As a result, it is possible to suppress the sound volume generated from the steel board BD from being reduced, the sound quality from being deteriorated, and the frequency band from being narrowed.

Therefore, in this embodiment, an external member can be vibrated to generate a high-quality sound from the member.

In the present embodiment, the disc shape of the vibration transmitting member 140 is the same as the disc portion of the support cap 139 in order to efficiently transmit the vibration of the vibration actuator 130 to the steel board BD. The contact area is not expanded. Further, each of the attachment member 121 and the attachment member 122 is disposed at the end portion on the −Y direction side and the end portion on the + Y direction side of the lid portion 112, and the vibration transmitting member 140 is the most from both the

attachment members

121 and 122. It arrange | positions so that it may become the center of the separated cover part 112. FIG. The arrangement of the mounting

members

121 and 122 and the vibration transmission member 140 suppresses a reaction from the steel board BD applied to the vibration transmission device 100 when vibration is applied to the steel board BD. The vibration transmission efficiency to BD can be improved.

For this reason, it can further suppress that the vibration transmission efficiency to the steel board BD of the vibration of the vibration actuator 130 falls. As a result, it is possible to further suppress the sound volume generated from the steel board BD from being reduced, the sound quality from being deteriorated, and the frequency band from being narrowed.

Therefore, in this embodiment, an external member can be vibrated to generate a higher quality sound from the member.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and various modifications are possible.

For example, in the above embodiment, the attachment member and the vibration transmission member are neodymium magnets, and the external member to which the vibration transmission device is attached is a steel board that can be attracted to the magnet. On the other hand, the attachment member and the vibration transmission member may be other types of magnets such as a ferrite magnet. When the external member is a magnet, the attachment member and the vibration transmitting member may be made of a material that can be attracted to the magnet (for example, a ferromagnetic such as iron).

Further, the external member may be a plate member such as a wooden member. In this case, when a plate member such as a wooden member is installed on a horizontal plane (a surface perpendicular to the direction in which gravity acts), the mounting member and the vibration transmission member are vertically downward, and the vibration transmission device is placed on the wooden plate member. It can be placed on. In addition, when the wooden board is not installed on the horizontal plane, the attachment member and the vibration transmission member in the vibration transmission device may be attached to the wooden board member with an adhesive or the like.

In the above embodiment, the number of vibration actuators is one. On the other hand, the number of vibration actuators may be two or more.

In the above embodiment, the vibration signal generation unit of the vibration transmission device includes a wireless communication unit, a control unit, a digital / analog conversion unit, and a power amplification unit. A digital sound field correction circuit may be provided in the preceding stage.

In the above embodiment, the vibration transmission device receives a sound signal from the external sound source device by BT communication. On the other hand, the vibration transmission device may receive a wireless signal transmitted from an external sound source device by wireless communication other than BT communication. The vibration transmitting device may acquire sound data (sound signal) from an external sound source device by wire. In this case, the external sound source device may include a power amplification unit and the like, and the vibration transmission device may acquire an output signal from the power amplification unit. In this case, the vibration signal generation unit can be omitted in the configuration of the vibration transmission device.

Further, the vibration transmission device of the present invention may be attached to a place where the user can see (for example, the surface of the whiteboard) or may be attached to a place where the user cannot see (for example, the back surface of the whiteboard). When the vibration transmission device is attached to a place where the user cannot see, it is possible to contribute to the interior design by making the user not aware of the presence of the vibration transmission device. In addition, when a waterproof vibration transmitting device is attached to the back surface of a waterproof wall or the back surface of a whiteboard, music can be enjoyed even in a humid place as a waterproof invisible speaker.

Further, the vibration transmission device of the present invention may be attached to a signboard or the like at a construction site. In this case, it is possible to output a sound for calling attention to a pedestrian passing near the construction site.

The vibration transmission device of the present invention can also be used for signage related products. For example, the vibration transmission device of the present invention is attached to the back surface of a mobile board placed in a public facility or school, and an advertisement display is pasted on the surface of the board. By combining the vibration transmission device of the present invention and the human sensor, it is possible to construct a signage system that can advertise by voice when there is a person near the board.

In the above embodiment, the vibration transmission device receives a sound signal from an external sound source device. However, for example, the vibration transmission device may receive a sound signal of a sound input to a wireless microphone. As described above, when the sound signal of the sound input to the wireless microphone is received and the vibration transmission device is attached to an educational site such as a school or an office whiteboard, the vibration transmission device is amplified. It can also be used as a device.

In the above embodiment, the vibration transmission device receives a sound signal from an external sound source device. However, sound data may be stored in the vibration transmission device.

Also, if the vibration transmission device is provided with a timer function and the external member is vibrated at a set time, the vibration transmission device can be used as a notification device for recognizing the time. In this case, for example, sound data of a chime sound or music sound may be stored inside the vibration transmission device.

In the above embodiment, the shape of the vibration transmission device is a rectangular parallelepiped, but other shapes may be used. For example, the vibration transmission device can be used as a toy if the appearance of the vibration transmission device is in the shape of an insect and the content of the sound data is the sound of the insect. In this case, the sound data may be acquired from the outside, and the sound data may be stored in the vibration transmission device.

Also, for example, if the appearance of the vibration transmission device is adapted to the interior space design and the content of the sound data is music, the music transmission can be enjoyed while making the vibration transmission device a part of the interior decoration.

In the above embodiment, the present invention is applied to sound reproduction in which sound corresponding to a sound signal is output to an external space, but the present invention can also be applied to other uses. For example, the vibration transmission device of the present invention can be applied to a vibration suppression (braking) application for attenuating vibrations of a building in the event of an earthquake or the like, or an application for removing water drops and dust.

Also, the vibration transmission device of the present invention can be applied to an acoustic watermark technology that embeds character information or the like obtained by encrypting an audio signal. For example, the present invention is applied to a technique in which a vibration transmission device transmits vibration corresponding to a signal in which character information is embedded in a non-audible band (around 20 kHz) to an external member, and a smartphone reads character information with dedicated software. be able to.

Claims

A vibration transmission device that can be attached to an external member,
A vibration actuator that vibrates in accordance with a signal supplied from the outside;
A vibration transmitting member fixed to the vibrating part;
A housing member that houses the vibration actuator;
An attachment member for attaching the housing member to the external member;
When the housing member is attached to the external member by the attachment member, the vibration transmission member is attached in close contact with the external member.
A vibration transmission device characterized by that.
The area of the connection portion of the vibration transmission member with the external member, and the interval between the vibration transmission member and the mounting member are determined according to the vibration transmission efficiency of the vibration of the vibration portion to the external member. The vibration transmission device according to claim 1.
3. The vibration transmission device according to claim 1, wherein the externally supplied signal is a sound signal.
The mounting member is a magnet,
The external member is a member made of a material that can be attracted to the magnet.
The vibration transmission device according to any one of claims 1 to 3, wherein
The vibration transmitting member is a magnet,
The external member is a member made of a material that can be attracted to the magnet.
The vibration transmission device according to any one of claims 1 to 4, wherein:
The housing member has an opening,
At least a part of the vibration transmitting member has the opening so that the casing member does not contact the external member when the vibrating part vibrates in a state where the casing member is attached to the external member. Through which the casing member is arranged so as to protrude outside.
The vibration transmitting device according to any one of claims 1 to 5, wherein
The vibration transmission device according to any one of claims 1 to 6, wherein the casing member accommodates a circuit component connected to the vibration actuator.
A vibration actuator; a vibration transmission member fixed to a vibration portion of the vibration actuator; a housing member that houses the vibration actuator; and an attachment member that attaches the housing member to an external member. A vibration transmission method used in an attachable vibration transmission device,
An acquisition step of acquiring a signal supplied from the outside in a state where the vibration transmission member is attached in close contact with the external member when the housing member is attached to the external member by the attachment member; ;
According to the signal acquired in the acquisition step, the vibration part vibrates, and the vibration transmission member vibrates in conjunction with the vibration of the vibration part, thereby transmitting vibration of the vibration part to the external member. Process and;
A vibration transmission method comprising: