WO2019234939A1

WO2019234939A1 - Acoustic device

Info

Publication number: WO2019234939A1
Application number: PCT/JP2018/022127
Authority: WO
Inventors: 潤勝沼
Original assignee: バブルラボカンパニー・リミテッド
Priority date: 2018-06-08
Filing date: 2018-06-08
Publication date: 2019-12-12

Abstract

Provided is an acoustic device that can be used as earphones worn on the head and as speakers worn on the shoulders and that makes it possible to obtain an ideal acoustic effect. An acoustic device 10 according to an embodiment of the present invention is provided with: a U-shaped band 20; a pair of arms 30 attached to each of the two ends of the band; and a pair of speaker units 60 that are attached to each of the pair of arms and that comprise a speaker 611, a communication module 607 for receiving audio data by wireless communication from an external device, a driver 609 for driving the speaker in accordance with the audio data, and a control unit 600 for controlling the communication module and the driver. In order to enable the orientations of the speaker units to be changed, the arms are provided so as to be capable of rotating axially on the band, and the speaker units are provided so as to be capable of rotating on the arms. The control unit controls the driver so that the volume of a speaker unit is adjusted in accordance with rotation thereof and a reference volume is changed together with a change in the orientation of the speaker unit.

Description

Acoustic device

The present invention relates to an acoustic device that can be used as a head-mounted earphone that covers a user's ear or as a shoulder-type speaker.

Earphones, speakers, etc. are known as acoustic devices for enjoying music and voice, and many types of devices have been developed. Such an acoustic device is connected by a lead wire that transmits audio data from a music player that reproduces music.

In recent years, many wireless earphones have been used as one of acoustic devices (for example, see Patent Document 1). In such an earphone, audio data is received wirelessly from a music player at hand, and sound is output from a speaker built in the earpad body. Such an acoustic device is very convenient because it allows you to enjoy music without being bothered by chords.

On the other hand, a shoulder type speaker that is of a wireless type and is used on both shoulders of a user is known (for example, see Patent Document 2). Such a shoulder-type speaker has speaker pads at both ends. Such an acoustic device is safe because it can always enjoy music in the best position even when the user walks around, and can also hear environmental sounds because it does not block both hands and ears.

The above-mentioned acoustic device has the following problems. That is, the user has to prepare earphones or shoulder-type speakers separately according to the situation. Also, if the earphone is forced to be used as a shoulder speaker, the position and orientation of the speaker is inappropriate and the volume is insufficient, making it difficult to use comfortably.

Japanese Patent Laying-Open No. 2015-084568 JP 2017-527177 A

The purpose is to provide an acoustic device that can be used as a headphone or a shoulder-type speaker and can achieve an acoustically ideal acoustic effect.

The acoustic device according to the present embodiment includes a U-shaped band, a pair of arms attached to both ends of the band, and a pair of arms attached to the pair of arms, and a speaker and audio data received from an external device by wireless communication. Communication module, a driver for driving the speaker in accordance with the audio data, and a pair of speaker units having a control unit for controlling the communication module and the driver. The arm is rotatably provided on the band to change the posture of the speaker unit, the speaker unit is rotatably provided on the arm, and the control unit adjusts the volume according to the rotation of the speaker unit. At the same time, the driver is controlled to change the reference volume in accordance with the change in the posture of the speaker unit.

According to the acoustic device according to the present embodiment, it can be used as a headphone or a shoulder speaker, and an ideal acoustic effect can be obtained.

FIG. 1 is a diagram illustrating a usage state when the acoustic device according to the present embodiment is used as a headphone type earphone. FIG. 2 is a diagram showing an external configuration of the acoustic device 10 of FIG. FIG. 3 is a diagram illustrating a usage state when the acoustic device according to the present embodiment is used as a shoulder-type speaker. FIG. 4 is a diagram showing an external configuration of the acoustic device 10 of FIG. FIG. 5 is an exploded perspective view showing the switching mechanism of the acoustic device according to the present embodiment. FIG. 6 is a supplementary diagram for explaining the operation of the switching mechanism of FIG. FIG. 7 is a supplementary diagram for explaining the operation of the switching mechanism of FIG. FIG. 8 is a supplementary diagram for explaining the operation of the switching mechanism of FIG. FIG. 9 is a block diagram showing the configuration of the acoustic device according to this embodiment.

One feature of the acoustic device according to the embodiment of the present invention is that the posture of the pair of speaker units can be changed. With this feature, the user can use the acoustic device as a head-on earphone in a posture where the pair of speaker units face each other. In a posture in which the pair of speaker units are arranged side by side, the user can use the acoustic device as a shoulder-type speaker. In addition to the normal volume adjustment function that changes the volume (output volume) output from the speaker unit by the user's operation, the acoustic device is used in accordance with the change in the posture of the pair of speaker units, that is, the usage mode is switched. The function of automatically changing the reference value (reference sound volume) of the sound volume is provided. By changing the reference volume, the volume of the sound output from the speaker can be changed. The sound device can automatically change the volume according to the usage pattern, and the user can listen to the sound output from the speaker at a comfortable volume. With this function, for example, when switching from a headphone type earphone to a shoulder type speaker, it is possible to avoid a situation where the sound output from the speaker is too low to hear any sound. Conversely, when switching from a shoulder-type speaker to a head-mounted earphone, it is possible to avoid a situation in which a loud sound flows at the ear.

Furthermore, not only the volume but also the sound quality, directivity, etc. can be automatically switched according to the usage form. Thereby, the user can use the acoustic device 10 comfortably in a favorite acoustic environment according to the usage pattern.

Hereinafter, the acoustic device 10 according to the present embodiment will be described with reference to the drawings. FIG. 1 is a diagram illustrating a usage state when the acoustic device 10 according to the present embodiment is used as a head-on earphone. FIG. 2 is a diagram showing an external configuration of the acoustic device 10 of FIG. FIG. 3 is a diagram illustrating a usage state when the acoustic device 10 according to the present embodiment is used as a shoulder-type speaker. FIG. 4 is a diagram showing an external configuration of the acoustic device 10 of FIG. 1 and 3, H denotes the user's head, N denotes the user's neck, S denotes the user's shoulder, and 200 denotes an electronic device such as a music playback player or a smartphone.

The acoustic device 10 has a rod-shaped band 20 having a U-shape. The band 20 functions as a headband when used as a head-mounted earphone, and functions as a neckband when used as a shoulder-type speaker. The arm 30 to which a pair of arms 30 are attached to both ends of the band 20 is configured as a hollow thin cylindrical body continuous with the shape of the end of the band 20. The band 20 and the arm 30 are made of, for example, resin or metal. A speaker unit 60 is attached to the arm 30. The speaker unit 60 is covered with a pad having cushioning properties, for example.

In order to change the posture of the speaker unit 60, the arm 30 is attached to the end portion of the band 20 so as to be freely rotatable. Thereby, the speaker unit 60 can rotate around the center line C <b> 1 of the arm 30 together with the arm 30, and its posture (orientation) can be changed. This rotation of the speaker unit 60 is referred to as revolution (turning). The speaker unit 60 is attached to the arm 30 so as to be rotatable about the axis. Thereby, the speaker unit 60 can rotate around the center line C2. The rotation of the speaker unit 60 is called autorotation.

The acoustic device 10 executes a process of changing the volume when the rotation of the speaker unit 60 is detected. This process corresponds to normal volume adjustment. Here, the volume is a value representing the range of change from the reference volume, and is expressed as a change volume. Further, when the acoustic device 10 detects the revolution of the speaker unit 60, the acoustic device 10 executes a process of changing the reference volume. The acoustic device 10 calculates the output volume based on the reference volume and the change volume, and outputs the sound having the output volume. Therefore, when the reference volume is fixed, the sound output from the speaker can be increased by increasing the change volume. In addition, when the change volume is fixed, if the reference volume is increased, the sound output from the speaker is also increased.

When the speaker unit 60 revolves, the usage pattern of the acoustic device 10 changes. If the usage pattern changes, the way the sound from the acoustic device 10 is heard changes. The acoustic device 10 changes the sound output from the acoustic device 10 following the change of the usage pattern, and realizes that the user can hear the voice comfortably in any usage pattern.

A form when used as a head-on earphone as shown in FIG. 1 will be described. 2A is a top view, FIG. 2B is a front view, and FIG. 2C is a side view. The pair of speaker units 60 are arranged from one arm 30 toward the other arm 30, that is, in a direction facing each other. At this time, the center lines of the pair of speaker units 60 coincide with each other. Actually, the pair of speaker units 60 are arranged at positions slightly rotated in opposite directions around the C1 axis from the direction facing each other in accordance with the angle of the user's ear. At this time, the center lines of the pair of speaker units 60 intersect each other. The speaker unit 60 is disposed close to the lower end side of the arm 30. Thereby, a pair of speaker unit 60 can be matched with the position of a user's ear in the state which hung the band 20 on the head. The position of the speaker unit 60 in the form shown in FIG.

Next, the form when used as a shoulder-type speaker as shown in FIG. 3 will be described. 4A is a top view, FIG. 4B is a front view, and FIG. 4C is a side view. The pair of speaker units 60 are arranged so as to be parallel to the surface of the shoulder S of the user, that is, in a direction aligned with each other. At this time, the center lines of the pair of speaker units 60 are parallel to each other. The sound output from the speaker unit 60 is emitted in the same direction. Actually, the pair of speaker units 60 are arranged in a direction slightly inclined inward from the direction in which they are arranged side by side. At this time, the center lines of the pair of speaker units 60 intersect each other. The speaker unit 60 is arranged close to the upper end side (band 20 side) of the arm 30. Thus, the speaker unit 60 can be placed on the user's shoulder S with the band 20 on the neck, and the speaker unit 60 can be directed to both ears. The position of the speaker unit 60 in the form shown in FIG. 4 corresponds to a position rotated approximately 90 degrees from the initial position.

Hereinafter, details of the switching mechanism of the usage pattern of the acoustic device 10 will be described with reference to FIGS. 5 to 8. By adopting the following switching mechanism, it is not necessary to cut out the peripheral surface of the arm 30 along the circumferential direction. If the arm 30 is a thick cylindrical body, the rigidity is maintained even if the circumferential surface of the arm 30 as described above is provided with a cutout along the circumferential direction, and the speaker unit 60 is rotated along the cutout. It may be possible. However, when the arm 30 is a thin cylindrical body, the notch along the circumferential direction of the arm 30 as described above reduces the rigidity of the arm. The present embodiment employs the following mechanism without using the mechanism for cutting out the peripheral surface of the arm 30 along the circumferential direction as described above, thereby ensuring the rigidity of the arm 30 and the speaker unit. It was possible to change 60 postures.

FIG. 5 is an exploded perspective view showing the switching mechanism of the acoustic device 10 according to the present embodiment. In FIG. 5, C <b> 1 indicates the center line of the band 20. As shown in FIG. 5, the rear end portion of the arm 30 is connected to the end portion of the band 20 so as to be axially rotatable. Specifically, both end portions of the band 20 are formed in a cylindrical body. This portion is referred to as a cylindrical portion 21. On the inner wall surface of the cylindrical portion 21, a recess 22 is formed in which a locking projection 52d of a leaf spring member 52 described later is locked. Further, a first groove 23 to be engaged with an engaging projection 46 described later and a second groove 24 continuous with the first groove 23 are formed on the end side from the position where the concave portion 22 is formed. Has been. The first groove 23 is formed along the center line C <b> 1, and the second groove 24 is formed along the circumferential direction of the tubular portion 21. That is, the first groove 23 and the second groove 24 form an L-shaped groove. A convex portion 25 is provided at the innermost portion of the second groove 24. The convex portion 25 is provided to press and turn on a changeover switch 625 described later.

The front portion of the arm 30 is configured as a cylindrical body having the same outer diameter as the cylindrical portion 21 of the band 20. A front portion of the arm 30 is referred to as a cylindrical portion 40. The rear portion of the arm 30 is configured as a cylindrical body formed with an outer diameter slightly smaller than the inner diameter of the cylindrical portion 21 of the band 20. A rear portion of the arm 30 is referred to as an insertion rod portion 50. The hollow inside of the insertion rod portion 50 continues to the hollow inside of the tubular portion 40.

The cylindrical portion 40 has an elongated opening 41 formed along the axis of the cylindrical portion 40. A support piece 44 that rotatably supports the speaker unit 60 is fitted into the opening 41. The support piece 44 is connected to a columnar base 43 disposed in the hollow interior of the tubular portion 40. The base 43 can reciprocate through the hollow interior along the axis of the cylindrical portion 40.

An elongated operating piece 45 formed of a leaf spring is attached to the rear end surface (end surface on the band 20 side) of the base 43. The operation piece 45 has a proximal end fixed to the base 43 and a distal end not fixed. The operating piece 45 is inclined toward the opening 51 described later. At the tip of the operating piece 45, there is provided an engaging protrusion 46 that comes into contact with the radially outer surface of the inclined portion 52c described later. A changeover switch 625 is attached to the side surface of the engaging protrusion 46. The operating piece 45 is biased toward the opening 51 side.

The insertion rod 50 has an elongated opening 51 formed on the wall surface. An elongated leaf spring member 52 having substantially the same shape as the opening 51 is fitted in the opening 51. One end portion 52a of the leaf spring member 52 is fixed to the rear portion of the insertion rod portion 50, and the other end portion 52b is not fixed. Further, the end portion 52b is provided with an inclined portion 52c that is inclined inward of the insertion rod portion 50. A hole 53 is formed in the wall surface of the insertion rod 50 facing the inclined portion 52c. The inclined portion 52 c of the spring member 52 bent by the operating piece 45 is inserted into the hole portion 53. A locking projection 52d is provided on the radially outer surface of the intermediate position of the leaf spring member 52. In a state where the acoustic device 10 is used as a headphone type earphone, the locking projection 52d is locked to the recess 22.

Next, the operation of each component when the usage pattern is switched from the headphone type earphone to the shoulder type speaker will be described with reference to FIGS. FIG. 6A is a longitudinal sectional view of the switching mechanism when used as a headphone type earphone, and FIG. 6B is a cross-sectional view taken along the line AA in FIG. 7 (a) is a longitudinal sectional view of the switching mechanism at the start of switching from a form used as a headphone type earphone to a form used as a shoulder-type speaker, and FIG. 7 (b) is a diagram of FIG. 7 (b). It is BB sectional drawing in (a). Further, FIG. 8A is a longitudinal sectional view of the switching mechanism immediately before completion of switching from a form used as a headphone type earphone to a form used as a shoulder-type speaker, and FIG. It is CC sectional drawing in (a). FIG. 8C shows the position of the engaging projection 46 when used as a shoulder-type speaker.

As shown in FIG. 6, the support piece 44 that supports the speaker unit 60 is disposed on the front end side of the arm 30 when used as a head-on earphone. At this time, the engaging protrusion 46 is located in the cylindrical portion 40 and is not in contact with the leaf spring member 52. Since the leaf spring member 52 is urged toward the opening 51 of the insertion rod portion 50 by its own elastic force, the locking projection 52d is fitted into the recess 22. When the locking projection 52d is fitted into the concave portion 22, the insertion rod portion 50 cannot rotate.

Next, as shown in FIG. 7, the speaker unit 60 is moved toward the rear end. Thereby, the support piece 44 and the operation piece 45 are moved to the band 20 side together with the speaker unit 60. The engaging protrusion 46 rides along the inclined portion 52 c of the leaf spring member 52. Since the leaf spring member 52 tries to return to the opening 51 side by its own elastic force, the engagement protrusion 46 is pressed against the opening 51 side by the leaf spring member 52, and the first groove 23 of the tubular portion 21 is pressed. Engage. Although the locking projection 52d comes out of the concave portion 22, the insertion rod portion 50 is maintained in a state in which the shaft cannot rotate because the engagement projection portion 46 is engaged with the first groove 23.

Next, as shown in FIG. 8, the speaker unit 60 is moved to the band 20 side end of the opening 41. The support piece 44 and the operation piece 45 move further to the band 20 side together with the speaker unit 60. As a result, the engaging protrusion 46 reaches the coupling point between the first groove 23 and the second groove 24. At this time, the shaft rotation of the insertion rod portion 50 restricted by the inner wall of the first groove 23 is permitted. When the arm 30 is rotated around the center line C <b> 1, the engagement protrusion 46 enters the second groove 24 and moves until it hits the protrusion 25. When the bump 20 hits the convex portion 25, the relative rotation between the band 20 and the arm 30 is stopped, and the changeover switch 625 provided on the side surface of the engaging projection 46 is turned on by the convex portion 25. As a result, the acoustic device 10 changes to a form used as a shoulder-type speaker. When used as a shoulder-type speaker, the inclined portion 52 c of the spring member 52 is inserted into the hole portion 53, so that the arm 30 does not rotate about the band 20.

Of course, in order to switch from a form used as a shoulder-type speaker to a form used as a head-mounted earphone, the reverse operation described above may be performed. That is, the arm 30 is rotated with respect to the band 20 so that the engaging protrusion 46 is moved from the second groove 24 to the first groove 23. Thereby, the changeover switch 625 provided on the side surface of the engaging protrusion 46 is turned off. When the engaging protrusion 26 enters the first groove 23, the speaker unit 60 is moved along the opening 41 in a direction away from the band 20. As a result, the operating piece 45 is separated from the leaf spring member 52, and the leaf spring member 52 returns into the opening 51. At this time, since the locking projection 52d enters the recess 22, the arm 30 cannot rotate with respect to the band 20.

Hereinafter, functions of the acoustic device 10 according to the present embodiment will be described. As shown in FIG. 9, the acoustic device 10 includes a control circuit 600, a battery 601, a charging circuit 603, a power supply circuit 605, a communication module 607, a driver 609, a speaker 611, a connector 620, a power switch 621, an operation unit 623, and a switching. A switch 625 is included. The changeover switch 625 is attached to the engagement protrusion 46. The connector 620 is provided on the back side of the speaker unit 60. Other components are accommodated in the speaker unit 60.

The battery 601 stores power to be supplied to each part of the speaker unit 60. The battery 601 is connected to the connector 620 via the charging circuit 603. The charging circuit 603 has a function of charging the battery 601 with power supplied from the outside through the connector 620. The connector 620 may be a connector including a positive electrode terminal and a negative electrode terminal dedicated for power supply, or may be a general-purpose connector having a power supply line such as USB (Universal Serial Bus).

The power supply circuit 605 generates the power supply voltage of each unit (the control circuit 600, the communication module 607, and the driver 609) using the electric power stored in the battery 601. A power switch 621 is connected to the power circuit 605. For example, the power switch 621 is a physical switch, and is provided at a position that is turned off when the speaker unit 60 is disposed at the initial position and turned on when the shaft is rotated from the initial position. The power supply circuit 605 supplies power to the control circuit 600, the communication module 607, and the driver 609 when the power switch 621 is on, and the control circuit 600 and the communication module 607 when the power switch 621 is off. And the power supply to the driver 609 is stopped.

The control circuit 600 controls each part of the speaker unit 60 in an integrated manner.
The communication module 607 receives audio data from various electronic devices 200 by short-range wireless communication such as Bluetooth (registered trademark) under the control of the control circuit 600, and receives reception processing such as decoding processing on the received audio data. Execute. The audio data received and processed by the communication module 607 is output to the driver 609 under the control of the control circuit 600.

The driver 609 converts the digital audio data received by the communication module 607 into an analog audio signal, and drives the speaker 611 according to the audio signal. The speaker 611 is driven by the driver 609 and outputs sound corresponding to the audio data.

The operation unit 623 and the changeover switch 625 are connected to the control circuit 600. The operation unit 623 is used by the user to adjust the volume. The changeover switch 625 is for detecting the posture of the pair of speaker units 60.

The operation unit 623 can use a rotation sensor. The operation unit 623 is attached to a position where the rotation (axial rotation) of the speaker unit 60 can be detected. The user can adjust the volume by rotating the speaker unit 60. The operation unit 623 outputs a signal corresponding to the rotation angle of the speaker unit 60 from the initial position to the control circuit 600. The control circuit 600 controls the driver 609 according to the output of the operation unit 623. The driver 609 holds a change volume table in which the rotation angle of the speaker unit 60 from the initial position and the change volume are associated with each other. The driver 609 identifies the change volume by referring to the change volume table based on the output of the operation unit 623.

The change-over switch 625 is for detecting whether the pair of speaker units 60 is in a posture that can be used as a head-on earphone or a posture that can be used as a shoulder-type speaker. In other words, the changeover switch 625 detects the revolution of the speaker unit 60. When the pair of speaker units 60 are used as shoulder-type speakers, the changeover switch 625 is turned on. The changeover switch 625 outputs a specific signal corresponding to ON / OFF to the control circuit 600. The control circuit 600 controls the driver 609 based on the output of the changeover switch 625. The driver 609 holds a reference volume table that defines a reference volume when the changeover switch 625 is on and a reference volume when the changeover switch 625 is off. For example, the reference volume when the usage pattern is a shoulder-type speaker is set higher than that when the usage pattern is a headphone type earphone. The reference volume can be changed by a user operation on dedicated application software installed on the external electronic device 200. Based on the output of the changeover switch 625, the driver 609 specifies the reference volume by referring to the reference volume table.

The driver 609 calculates the output volume based on the reference volume and the change volume, and changes the signal amplification factor of the amplifier that amplifies the audio signal according to the output volume. Of course, the driver 609 may modulate the audio data in order to change the amplitude of the audio signal in accordance with the output volume. Thereby, the volume of the sound output from the speaker 611 is changed.

In addition, in order to change not only the volume but also the sound quality according to the change in the posture of the pair of speaker units 60, it can be configured as follows.

That is, the control circuit 600 holds the sound quality table when the changeover switch 625 is on and the sound quality table when the changeover switch 625 is off. In the sound quality table, an amplification factor (correction value) for each frequency band of audio data is defined. Each sound quality table can be changed by the user's operation on dedicated application software installed on the external electronic device 200. The control circuit 600 determines a sound quality table to be used based on the output of the changeover switch 625. The driver 609 modulates the audio data using the sound quality table determined by the control circuit 600. Thereby, the sound quality of the sound output from the speaker 611 can be changed.

Furthermore, in order to change not only the volume but also the directivity according to the change in the posture of the pair of speaker units 60, the following configuration can be made.

That is, the speaker unit 60 accommodates a plurality of speakers 611 having different directivities. The control circuit 600 holds a speaker 611 and a sound quality table that are driven when the changeover switch 625 is turned on, and a table that defines the speaker 611 that is driven when the changeover switch 625 is turned off. This table can be changed by a user operation on dedicated application software installed on the external electronic device 200. The control circuit 600 determines the speaker 611 to be used based on the output of the changeover switch 625. The driver 609 drives the speaker 611 determined by the control circuit 600 according to the audio signal. Thereby, the directivity of the sound output from the speaker 611 can be changed. Of course, the directivity of the sound output from the speaker 611 may be changed without switching the speaker 611 by performing modulation processing on the audio data. For example, the driver 609 changes the phase for each frequency band of the audio data or the audio signal in order to change the directivity.

Furthermore, in this embodiment, in order to change the volume, sound quality, and directivity, the audio data modulation processing executed by the driver 609 may be executed by another circuit, for example, a signal processing circuit.

By the function of changing the volume, sound quality, and directivity following the change in the posture of the speaker unit 60 described above, the user can change the usage form from the state of using the headphone earphone to the shoulder type. Even when switching to the speaker, it is possible to hear the sound in a comfortable acoustic environment without readjusting these. If the above function is not provided, if the speaker unit 60 is revolved and the speaker unit 60 placed on both ears is arranged at the shoulder position, the distance from the speaker unit 60 to the ear is simply increased. The sound output from the unit 60 cannot be heard or is so small that it is difficult to hear. The user must dynamically adjust the volume each time the usage mode is switched.

Note that the switching mechanism provided in the acoustic device 10 according to the present embodiment, for example, the mechanism for revolving the speaker unit 60 and the mechanism for adjusting the position of the speaker unit are not limited to the above, and may have other configurations. In addition, the material and dimensions of each member can be selected appropriately according to the physique and strength of the user. Of course, various modifications are possible.

In the present embodiment, various processes for changing the sound volume, sound quality, and directivity in accordance with the change in the posture of the speaker unit 60 are executed inside the acoustic device 10, but the acoustic device 10 is connected. The electronic device 200 is configured to execute these processes, and the acoustic device 10 can be configured to receive the processed audio data from the electronic apparatus 200 and output the sound corresponding to the processed audio data. . In this case, when the changeover switch 625 is turned on or off, that is, when the posture of the speaker unit 60 is changed, the control circuit 600 sets the communication module 607 to transmit a specific signal indicating the change in the posture of the speaker unit 60 to the electronic device 200. Control. The electronic device 200 transmits the audio data subjected to the digital signal processing to the acoustic device 10 based on the volume, sound quality, and directivity according to the attitude of the speaker unit 60 on dedicated application software. As a result, the volume, sound quality, and directivity of the sound output from the speaker 611 have been described. Although several embodiments of the present invention have been described, these embodiments are presented as examples and It is not intended to limit the scope. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Acoustic device, 20 ... Band, 21 ... Cylindrical part, 22 ... Recessed part, 23 ... 1st groove | channel, 24 ... 2nd groove | channel, 26 ... Engagement protrusion part, 30 ... Arm, 40 ... Cylindrical part, 41 ... Opening, 43 ... Base, 44 ... Supporting piece, 45 ... Working piece, 46 ... Engagement projection, 50 ... Insertion bar, 51 ... Opening, 52 ... Leaf spring member, 52a ... End, 52b ... End 52c, an inclined part, 52d, a locking projection, 60, a speaker unit, 600, a control part.

Claims

U-shaped band,
A pair of arms respectively attached to both ends of the band;
Each of the pair of arms is attached to a speaker, a communication module that receives audio data from an external device through wireless communication, a driver that drives the speaker based on the audio data, and the communication module and the driver. A pair of speaker units having a control unit,
The arm is provided on the band so as to freely rotate in order to change the posture of the speaker unit,
The speaker unit is rotatably provided on the arm,
The control unit is an acoustic device that adjusts the volume according to the rotation of the speaker unit and controls the driver to change a reference volume according to a change in the attitude of the speaker unit.
The pair of speaker units change an attitude between a first attitude in which the pair of speaker units are arranged in a direction facing each other and a second attitude in which the pair of speaker units are arranged in a line with each other. Item 1. An acoustic device according to Item 1.
Both end portions of the band are formed in a cylindrical body, and a first groove formed along an axial direction is formed on an inner wall surface of the cylindrical body, and is connected to the first groove along the axis of the inner wall surface. A second groove formed by
2. The acoustic device according to claim 1, wherein the arm has a rod-shaped insertion rod portion that can be inserted into and removed from the cylindrical body, and has an engagement protrusion configured to be movable along the first groove and the second groove. .
The arm includes a biasing member that biases the engagement protrusion toward the radially outer side of the insertion bar when the engagement protrusion moves toward the tip of the insertion bar. 3. The acoustic device according to 3.
The acoustic device according to claim 4, wherein the arm has a support piece that movably supports the speaker unit along a central axis of the arm, and the engagement protrusion is connected to the support piece.
The acoustic device according to claim 5, wherein the switch for detecting a change in the posture is attached to the engaging protrusion.
U-shaped band,
A pair of arms attached to both ends of the band so as to be axially rotatable;
A pair of speaker units attached to the pair of arms, each having a speaker, a communication module for receiving audio data from an external device by wireless communication, and a driver for driving the speaker based on the audio data; ,
An acoustic device in which at least one of volume, sound quality, and directivity of sound output from the speaker changes when the speaker unit rotates together with the arm at a predetermined angle from an initial position.
U-shaped band,
A pair of arms respectively attached to both ends of the band;
Each of the pair of arms is attached to a speaker, a communication module that receives audio data from an external device through wireless communication, a driver that drives the speaker based on the audio data, and the communication module and the driver. A pair of speaker units having a control unit,
The arm is provided on the band so as to freely rotate in order to change the posture of the speaker unit,
The control unit is an acoustic device that controls the communication module to transmit a specific signal representing a change in posture of the speaker unit to the external device when the posture of the speaker unit is changed.