Patent Publication Number: US-2023164481-A1

Title: Electrical device

Description:
CROSS-REFERENCE OF RELATED APPLICATIONS 
     This application is the U.S. National Phase under 35 U.S.C. § 371 of International Patent Application No. PCT/JP2021/036915, filed on Oct. 6, 2021, which in turn claims the benefit of Japanese Patent Application No. 2021-028197, filed on Feb. 25, 2021, the entire disclosures of which Applications are incorporated by reference herein. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to an electrical device, and more specifically to an electrical device mounted on a wall of a building. 
     BACKGROUND ART 
     Conventionally, an electrical device such as a speaker is known. As an example of this type of prior art, Patent Literature (PTL) 1 discloses a speaker unit mounted on a baffle plate with a vibration absorbing member interposed between the speaker unit and the baffle plate. 
     CITATION LIST 
     Patent Literature 
     [PTL 1] Japanese Unexamined Patent Application Publication No. 2002-281579 
     SUMMARY OF INVENTION 
     Technical Problem 
     When the electrical device having an actuator such as the speaker unit of PTL 1 is mounted on the wall of a building, the vibration of the actuator is transmitted to the wall, causing the wall to vibrate and generate noise. Therefore, in order to suppress the vibration of the wall, it is common to install a sound absorbing material on the wall. However, because it requires a certain amount of money to install a sound absorbing material, and there are time restrictions such that a sound absorbing material can only be installed during new construction or renovation, it is not easy to install any sound absorbing material, and it is not easy to suppress the vibration of the wall. 
     Therefore, the present disclosure provides the electrical device that can easily suppress the vibration of the wall. 
     Solution to Problem 
     The electrical device according to an aspect of the present disclosure is an electrical device that is mounted on a wall of a building, the electrical device including: an actuator that vibrates; and an absorbing member that absorbs vibration of the actuator and is positioned behind the actuator in a predetermined direction, where a direction from a back side to a front side of the wall is defined as a direction toward a front in the predetermined direction in a state where the electrical device is mounted on the wall. 
     Advantageous Effects of Invention 
     The electrical device of the present disclosure can easily suppress the vibration of the wall. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
       [ FIG.  1   ] 
         FIG.  1    is a diagram showing a state in which an electrical device according to an embodiment is mounted on a wall of a building. 
       [ FIG.  2   ] 
         FIG.  2    is a perspective view of the electrical device of  FIG.  1    as viewed from the front side in a predetermined direction. 
       [ FIG.  3   ] 
         FIG.  3    is a perspective view of the electrical device of  FIG.  1    as viewed from the back side in a predetermined direction. 
       [ FIG.  4   ] 
         FIG.  4    is an exploded perspective view of a portion of the electrical device of  FIG.  1   . 
       [ FIG.  5   ] 
         FIG.  5    is an end view taken along line V-V in  FIG.  3   . 
       [ FIG.  6   ] 
         FIG.  6    is an end view taken along line VI-VI in  FIG.  3   . 
       [ FIG.  7   ] 
         FIG.  7    is a diagram showing terminals and electrical wires of the electrical device in  FIG.  1   . 
       [ FIG.  8   ] 
         FIG.  8    is a graph showing a comparison result between the electrical device in  FIG.  1    and an electrical device of a comparative example. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments will be specifically described with reference to the drawings. 
     It should be noted that all the embodiments described below show comprehensive or specific examples. Numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present disclosure. 
     In addition, among the components in the following embodiments, the components that are not described in independent claims indicating the broadest concept will be described as optional components. In addition, each figure is a schematic diagram and is not necessarily strictly illustrated. In addition, in each figure, the same component members are designated with the same reference numerals. 
     In this specification and drawings, the X-axis, Y-axis, and Z-axis represent the three axes of a three-dimensional orthogonal coordinate system, and the X-axis and Y-axis are the axes orthogonal to each other and orthogonal to the Z-axis. The Z-axis plus direction is a direction that coincides with the direction from the back side to the front side of the wall on which the electrical device is mounted. 
     Embodiment 
       FIG.  1    is a diagram showing a state in which electrical device  10  according to the embodiment is mounted on wall  1  of the building. 
     As shown in  FIG.  1   , electrical device  10  is an electrical device mounted on wall  1  of the building. In this embodiment, electrical device  10  is an embedded speaker embedded in wall  1 , and wall  1  is a wall included in the ceiling of room  2  inside the building. In this embodiment, wall  1  includes socket component  3  (see  FIG.  5    and  FIG.  6   ) that is engageable attachment member  18  (described below), and electrical device  10  is mounted on wall  1  by being engaged with socket component  3 . 
       FIG.  2    is a perspective view of electrical device  10  of  FIG.  1    as viewed from the front side in a predetermined direction. Specifically,  FIG.  2    is a perspective view of electrical device  10  mounted on wall  1  as viewed from the front side in a predetermined direction. It should be noted that the illustration of wall  1  is omitted in  FIG.  2    in order to avoid complicating the drawing.  FIG.  3    is a perspective view of electrical device  10  of  FIG.  1    as viewed from the back side in a predetermined direction. Specifically,  FIG.  3    is a perspective view of electrical device  10  mounted on wall  1  as viewed from the back side in a predetermined direction. It should be noted that the illustration of wall  1  is omitted in  FIG.  3    in order to avoid complicating the drawing.  FIG.  4    is an exploded perspective view of part of electrical device  10  in  FIG.  1   .  FIG.  5    is an end view taken along line V-V in  FIG.  3   .  FIG.  6    is an end view taken along line VI-VI in  FIG.  3   . 
     The predetermined direction is a direction in which the direction from the back side to the front side of wall  1  is the front. In the following description, the predetermined direction may be the Z-axis direction, the front in the predetermined direction may be the Z-axis plus direction, and the back in the predetermined direction may be the Z-axis minus direction. In addition, in the following description, the surface of a certain member on the side in the Z axis plus direction may be referred to as the front surface, and the surface of a certain member on the side in the Z axis minus direction may be referred to as the rear surface. 
     As shown in  FIG.  2    to  FIG.  6   , electrical device  10  includes actuator  12 , diaphragm  14 , main body member  16 , attachment member  18 , absorbing member  20 , support member  22 , a plurality of fastening members  24 , cover member  26 , a plurality of terminals  28  and a plurality of absorbing members  29 . In this embodiment, electrical device  10  emits sound in the Z-axis plus direction by actuator  12  vibrating, and the direction in which electrical device  10  emits sound is the front. 
     Actuator  12  vibrates based on power supplied from an external power supply (not shown). In this embodiment, actuator  12  vibrates back and forth in a predetermined direction (Z-axis direction) in a state where electrical device  10  is mounted on wall  1 . As described above, the predetermined direction is the direction in which the direction from the back side to the front side of wall  1  is the front. In this embodiment, the back side of wall  1  is the opposite side of wall  1  from room  2 , the front side of wall  1  is the room  2  side of wall  1 , and the predetermined direction is the direction orthogonal to the main surface on the front side of wall  1  and the direction orthogonal to the direction in which wall  1  is spread (the direction parallel to the XY plane). Actuator  12  includes magnetic circuit  30  and voice coil body  32 . 
     Magnetic circuit  30  includes magnet  34 , plate  36 , and yoke  38 , and generates magnetic flux. 
     Magnet  34  is a magnetized permanent magnet. Magnet  34  is in an annular shape. In the state where electrical device  10  is mounted on wall  1 , the axial direction of magnet  34  coincides with the Z-axis direction, and magnet  34  is in the form of a plate whose thickness direction is the Z-axis direction. 
     Plate  36  is in an annular shape and is provided coaxially with magnet  34 . In the state where electrical device  10  is mounted on wall  1 , plate  36  is in the form of a plate whose thickness direction is the Z-axis direction, and is provided on the front surface of magnet  34 . For example, plate  36  is formed of a ferromagnetic material such as iron. 
     Yoke  38  includes middle portion  40  and flange portion  42 . Central portion  40  is in the shape of a solid cylinder, is inserted through the inside of magnet  34  (inside of the annular shape) and the inside of plate  36 , and is provided coaxially with magnet  34 . A magnetic gap is formed between central portion  40  and plate  36 . Flange portion  42  is in an annular shape and is provided coaxially with magnet  34 . In the state where electrical device  10  is mounted on wall  1 , flange portion  42  protrudes from the rear end of central portion  40  in a direction orthogonal to the Z-axis direction, and magnet  34  is provided on the front surface of flange portion  42 . For example, yoke  38  is formed of a ferromagnetic material such as iron. 
     Voice coil body  32  includes bobbin  44  and coil  46 . Bobbin  44  is in the shape of a hollow cylinder, and central portion  40  is inserted through the inside of bobbin  44 . Coil  46  is wound around the outer peripheral surface of bobbin  44 . In the state where electrical device  10  is mounted on wall  1 , the rear end of bobbin  44  is provided in the magnetic gap formed by magnetic circuit  30  together with coil  46 . In addition, in the state where electrical device  10  is mounted on wall  1 , the front end of bobbin  44  is connected to diaphragm  14 . When audio signals are input to coil  46 , voice coil body  32  vibrates in the axial direction of magnet  34  due to the interaction with the magnetic flux generated by magnetic circuit  30 . That is, in the state where electrical device  10  is mounted on wall  1 , voice coil body  32  vibrates back and forth in the Z-axis direction. For example, the audio signals are transmitted to electrical device  10  by wireless communication from an external communication terminal (not shown) such as a smart phone. Voice coil body  32  may be coupled to speaker frame  47  via a damper (not shown). Speaker frame  47  is a member provided with mounting bracket  62 . 
     Diaphragm  14  vibrates due to the vibration of actuator  12 . Diaphragm  14  includes annular portion  48  and center cap  50 . Annular portion  48  is in an annular shape, the inner peripheral portion of annular portion  48  is fixed to bobbin  44 , and the outer peripheral portion of annular portion  48  is fixed to first shell member  58  via mounting bracket  62  of main body member  16 , second frame member  56 , and the like. In the state where electrical device  10  is mounted on wall  1 , annular portion  48  has a shape that gradually widens toward the front. Diaphragm  14  vibrates by voice coil body  32  vibrating, and outputs sound to the front. Center cap  50  is mounted on the central portion of annular portion  48  and covers the front of voice coil body  32  in the state where electrical device  10  is mounted on wall  1 . 
     Main body member  16  is a body member to which actuator  12  is fixed, and is provided so as to be positioned between actuator  12  and attachment member  18 . Main body member  16  is a housing that houses actuator  12 . Main body member  16  includes fixing member  52 , first frame member  54 , second frame member  56 , first shell member  58 , cover member  60 , mounting bracket  62 , and second shell member  64 . 
     In the state where electrical device  10  is mounted on wall  1 , fixing member  52  of main body member  16  is in the form of a plate whose thickness direction is the Z-axis direction, and is provided on the rear surface of yoke  38 . Fixing member  52  is fixed to first frame member  54  of main body member  16 . Fixing member  52  is a cushion for the purpose of damping the vibration of magnetic circuit  30 . Magnetic circuit  30  includes yoke  38 , magnet  34  and plate  36 , which are fixed to one another. Magnetic circuit  30  is fixed to speaker frame  47 . Mounting bracket  62  is provided on speaker frame  47 . Speaker frame  47  is fixed to first shell member  58  by mounting bracket  62  being mounted on first shell member  58 . 
     In the state where electrical device  10  is mounted on wall  1 , first frame member  54  of main body member  16  is in a bottomed tubular shape whose axial direction is the Z-axis direction, and is provided on the periphery of actuator  12  and behind actuator  12 . In the state where electrical device  10  is mounted on wall  1 , second frame member  56  of main body member  16  is in a tubular shape whose axial direction is the Z-axis direction, is provided coaxially with first frame member  54  of main body member  16 , and is fixed to the front portion of first frame member  54 . 
     In the state where electrical device  10  is mounted on wall  1 , first shell member  58  of main body member  16  is in a tubular shape whose axial direction is the Z-axis direction, is provided coaxially with first frame member  54  of main body member  16 , and covers the periphery of first frame member  54  and the periphery of second frame member  56 . 
     In the state where electrical device  10  is mounted on wall  1 , cover member  60  of main body member  16  is provided in front of actuator  12  and is mounted on the opening of first shell member  58  of main body member  16 . In the state where electrical device  10  is mounted on wall  1 , cover member  60  includes a plurality of through holes (not shown) penetrating through cover member  60  in the Z-axis direction. Sound output by the vibration of actuator  12  is emitted to the outside of electrical device  10  through the plurality of through holes. 
     Mounting bracket  62  of main body member  16  is a bracket for mounting diaphragm  14  to first shell member  58  of main body member  16 . 
     In the state where electrical device  10  is mounted on wall  1 , second shell member  64  of main body member  16  is in a bottomed tubular shape whose axial direction is the Z-axis direction, is provided coaxially with main body member  16 , is open to the front, and is fixed to the rear portion of first shell member  58  of main body member  16 . Second shell member  64  includes first plate-shaped portion  66 , a plurality of threaded portions  67 , first peripheral wall  68 , second plate-shaped portion  70 , and second peripheral wall  72 . 
     First plate-shaped portion  66  is provided between actuator  12  and second member  84 . In the state where electrical device  10  is mounted on wall  1 , first plate-shaped portion  66  is in the form of a plate whose thickness direction is the Z-axis direction, is in an annular shape having through hole  73  in the center when viewed from the Z-axis direction, and is provided behind actuator  12  and in front of second member  84 . That is, first plate-shaped portion  66  overlaps actuator  12  and second member  84  when viewed from the Z-axis direction in the state where electrical device  10  is mounted on wall  1 . 
     A plurality of threaded portions  67  are provided on first plate-shaped portion  66 , and a plurality of fastening members  24  are threadedly engaged. In a state where electrical device  10  is mounted on wall  1 , first peripheral wall  68  protrudes to the front from the outer peripheral portion of first plate-shaped portion  66  and is in a tubular shape. In the state where electrical device  10  is mounted on wall  1 , second plate-shaped portion  70  protrudes outward in a direction orthogonal to the Z-axis direction from the front end of first peripheral wall  68 , and is in an annular shape when viewed from the Z-axis direction. Second plate-shaped portion  70  includes a plurality of through holes  74  through which the plurality of terminals  28  are inserted. In the state where electrical device  10  is mounted on wall  1 , second peripheral wall  72  protrudes to the front from the outer peripheral portion of second plate-shaped portion  70 , and is in a tubular shape that is annular when viewed from the Z-axis direction. The front end of second peripheral wall  72  is connected to first shell member  58  of main body member  16 . 
     For example, fixing member  52 , first frame member  54 , second frame member  56 , first shell member  58 , cover member  60 , and second shell member  64  of main body member  16  are formed of resin or the like. 
     In the state where electrical device  10  is mounted on wall  1 , attachment member  18  is positioned behind actuator  12  in the Z-axis direction and is attached to wall  1 . First member  82  is provided between attachment member  18  and support member  22 , and attachment member  18  is not in contact with support member  22  at least when actuator  12  is not vibrating. In addition, second member  84  is provided between attachment member  18  and first plate-shaped portion  66  of main body member  16 , and attachment member  18  is not in contact with main body member  16  at least when actuator  12  is not vibrating. For example, attachment member  18  is formed of resin or the like. Attachment member  18  includes plate-shaped portion  76 , first protrusion  77 , second protrusion  78 , peripheral wall  79 , and a plurality of engaging portions  80 . 
     In the state where electrical device  10  is mounted on wall  1 , plate-shaped portion  76  is in the form of a plate whose thickness direction is the Z-axis direction, and is positioned behind actuator  12  and first plate-shaped portion  66 . That is, plate-shaped portion  76  overlaps actuator  12  and first plate-shaped portion  66  when viewed from the Z-axis direction in the state where electrical device  10  is mounted on wall  1 . Plate-shaped portion  76  includes a plurality of through holes  81  through which the plurality of fastening members  24  are inserted. The plurality of through holes  81  are not in contact with the plurality of fastening members  24 . 
     In the state where electrical device  10  is mounted on wall  1 , first protrusion  77  protrudes to the back from the central portion of plate-shaped portion  76 . First protrusion  77  is inserted through through hole  86  of first member  82 . 
     In the state where electrical device  10  is mounted on wall  1 , second protrusion  78  protrudes to the front from the central portion of plate-shaped portion  76 . Second protrusion  78  is inserted through hole  73  of main body member  16  and through hole  88  of second member  84 . Second protrusion  78  is not in contact with through hole  73  of main body member  16 . 
     In the state where electrical device  10  is mounted on wall  1 , peripheral wall  79  includes a portion that protrudes to the front from the outer peripheral portion of plate-shaped portion  76  and the inner peripheral surface of the portion faces first peripheral wall  68 . In addition, in the state where electrical device  10  is mounted on wall  1 , peripheral wall  79  includes a portion that protrudes to the back from the outer peripheral portion of plate-shaped portion  76  and the inner peripheral surface of the portion faces support member  22 . 
     Each of the plurality of engaging portions  80  detachably engages with wall  1 . Specifically, each of the plurality of engaging portions  80  is recessed on the outer peripheral surface of peripheral wall  79 , engages with socket component  3  by being hooked on protrusion  4  of socket component  3 , and is mounted on wall  1 . Socket component  3  is included in wall  1 . That is, protrusion  4  is included in wall  1 . 
     In the state where electrical device  10  is mounted on wall  1 , absorbing member  20  is positioned behind actuator  12  in the Z-axis direction and absorbs the vibration of actuator  12 . That is, in the state where electrical device  10  is mounted on wall  1 , absorbing member  20  overlaps actuator  12  when viewed from the Z-axis direction. Absorbing member  20  includes first member  82  and second member  84 . 
     First member  82  is provided on the opposite side of attachment member  18  from actuator  12  and is provided between attachment member  18  and support member  22 . That is, in the state where electrical device  10  is mounted on wall  1 , first member  82  is positioned behind attachment member  18  and actuator  12  and in front of support member  22  and overlaps attachment member  18 , actuator  12 , and support member  22  when viewed from the Z-axis direction. In the state where electrical device  10  is mounted on wall  1 , first member  82  is in the form of a plate whose thickness direction is the Z-axis direction and is in an annular shape having through hole  86  in the center when viewed from the Z-axis direction. The main surface of first member  82  on the side of actuator  12  is in contact with plate-shaped portion  76 , and the main surface on the opposite side of first member  82  from actuator  12  is in contact with support member  22 . First member  82  is covered with attachment member  18  and support member  22  and housed inside electrical device  10 . First member  82  has greater elasticity (flexibility) than attachment member  18  and support member  22 . For example, first member  82  is formed of soft urethane, urethane foam, rubber, or the like. 
     Second member  84  is provided on the side of actuator  12  of attachment member  18  and is provided between attachment member  18  and main body member  16 . That is, in the state where electrical device  10  is mounted on wall  1 , second member  84  is positioned in front of attachment member  18  and behind actuator  12  and main body member  16 , and overlaps attachment member  18 , actuator  12 , and main body member  16  when viewed from the Z-axis direction. In the state where electrical device  10  is mounted on wall  1 , second member  84  is in the form of a plate whose thickness direction is the Z-axis direction, and is in an annular shape having through hole  88  in the center when viewed from the Z-axis direction. The main surface of second member  84  on the side of actuator  12  is in contact with first plate-shaped portion  66 , and the main surface on the opposite side of second member  84  from actuator  12  is in contact with plate-shaped portion  76 . Second member  84  is covered with attachment member  18  and main body member  16  and housed inside electrical device  10 . Second member  84  has greater elasticity (flexibility) than attachment member  18  and second shell member  64  of main body member  16 . For example, second member  84  is formed of soft urethane, urethane foam, rubber, or the like. 
     Support member  22  is provided on the opposite side of attachment member  18  from actuator  12 . That is, in the state where electrical device  10  is mounted on wall  1 , support member  22  is positioned behind attachment member  18  and actuator  12 , and overlaps attachment member  18  and actuator  12  when viewed from the Z-axis direction. In the state where electrical device  10  is mounted on wall  1 , support member  22  is in the form of a plate whose thickness direction is the Z-axis direction and is in an annular shape having through hole  90  in the center when viewed from the Z-axis direction. 
     Support member  22  is coupled to main body member  16 . As described above, main body member  16  includes second shell member  64 , and second shell member  64  includes a plurality of threaded portions  67 . Specifically, support member  22  includes a plurality of through holes  92  through which the plurality of fastening members  24  are inserted, and by threadedly engaging each fastening member  24  inserted through respective through hole  92  of support member  22  and respective through hole  81  of attachment member  18  with respective threaded portion  67  of main body member  16 , support member  22  is coupled to main body member  16  so as not to be separated from main body member  16 . Support member  22  contacts first member  82  but does not contact attachment member  18 . For example, support member  22  is formed of metal or the like. 
     Cover member  26  is provided on the opposite side of support member  22  from actuator  12  and covers support member  22 . 
     Each of the plurality of terminals  28  is a terminal to which electric wire  5  that electrically connects the external power source and actuator  12  is connected. Electric wire  5  is not a part of electrical device  10  but is provided on the side of wall  1 , and is an electric wire for supplying electric power to electrical device  10  from an external power source. The plurality of terminals  28  are electrically connected to coil  46  of actuator  12 , whereby electric power from electric wire  5  is supplied to coil  46  of actuator  12 . The plurality of terminals  28  protrude to the back from a plurality of through holes  74  and do not overlap actuator  12  when viewed from the Z-axis direction. It should be noted that each of the plurality of terminals  28  may overlap actuator  12  when viewed from the Z-axis direction in the state where electrical device  10  is mounted on wall  1 . Each of the plurality of terminals  28  is connected to electric wire  5  from the direction orthogonal to the vibration direction of actuator  12 . That is, in this embodiment, each of the plurality of terminals  28  is connected to electric wire  5  from the direction orthogonal to the Z-axis direction in the state where electrical device  10  is mounted on wall  1 . 
       FIG.  7    is an end view showing terminal  28  and electric wire  5  of electrical device  10  of  FIG.  1   . As shown in  FIG.  7   , terminal  28  is connected to electric wire  5  from a direction orthogonal to the Z-axis direction in the state where electrical device  10  is mounted on wall  1 . Therefore, when terminal  28  vibrates back and forth by actuator  12  vibrating, terminal  28  can be easily slid relative to electric wire  5 . This makes it difficult for the vibration of terminal  28 , that is, the vibration of actuator  12 , to be transmitted to electric wire  5 , thereby suppressing the vibration of actuator  12  from being transmitted to wall  1  via electric wire  5 . 
     A plurality of absorbing members  29  are attached to second plate-shaped portion  70 . The plurality of absorbing members  29  are not in contact with wall  1  in the state where electrical device  10  is mounted on wall  1 . For example, the plurality of absorbing members  29  are members for suppressing electrical device  10  from tilting against wall  1  by contacting to wall  1  in such a case or the like that electrical device  10  is mounted on wall  1  included in a side wall instead of the ceiling of the room and tilted against wall  1 . Contact of the plurality of absorbing members  29  with wall  1  can suppress second shell member  64  and the like of main body member  16  from contacting wall  1 . 
     In electrical device  10  as described above, in the state where electrical device  10  is mounted on wall  1 , when actuator  12  vibrates, main body member  16  to which actuator  12  is fixed may also vibrate back and forth. In addition, the vibration of main body member  16  may also cause support member  22  coupled to main body member  16  to vibrate back and forth. 
     Here, in electrical device  10 , support member  22  coupled to main body member  16  is placed on attachment member  18  via first member  82 , and actuator  12 , main body member  16 , and the like are supported by attachment member  18  in such a manner as to hang from attachment member  18 . That is, the weight of actuator  12 , main body member  16 , and the like is added to attachment member  18 . Therefore, without first member  82 , support member  22  and attachment member  18  would come into direct contact with each other, and the vibration of actuator  12  would be easily transmitted to attachment member  18  via main body member  16 , support member  22 , and the like. 
     In electrical device  10 , since first member  82  is provided between support member  22  and attachment member  18 , the vibration of support member  22  is absorbed by first member  82 , and the vibration of support member  22  can be suppressed from being transmitted to attachment member  18 . In this way, first member  82  can suppress transmission of the vibration of actuator  12  to attachment member  18 . That is, the vibration of actuator  12  can be suppressed from being transmitted to wall  1  vian attachment member  18 , and the vibration of wall  1  can be suppressed. 
     In addition, although main body member  16  and attachment member  18  do not come into direct contact with each other even without second member  84 , electrical device  10  is provided with second member  84  between main body member  16  and attachment member  18  so that the vibration of main body member  16  is absorbed by second member  84 , and the vibration of main body member  16  can be suppressed from being transmitted to attachment member  18 . In this way, second member  84  can further suppress transmission of the vibration of actuator  12  to attachment member  18 . That is, the vibration of actuator  12  can be suppressed from being transmitted to wall  1  via attachment member  18 , and the vibration of wall  1  can be further suppressed. 
     It should be noted that attachment member  18  is not in direct contact with any portion of electrical device  10  other than first member  82  and second member  84 . That is, since main body member  16 , support member  22 , and the like are supported by attachment member  18  only through absorbing member  20 , these vibrations can be absorbed by absorbing member  20  before being transmitted to attachment member  18 . 
       FIG.  8    is a graph showing a comparison result between electrical device  10  in  FIG.  1    and the electrical device in the comparative example. The electrical device in the comparative example has the same configuration as electrical device  10  without absorbing member  20 . 
     As shown in  FIG.  8   , the vibration of wall  1  of the building was measured using electrical device  10  with absorbing member  20  and the electrical device in the comparative example without absorbing member  20 . 
     With regard to electrical device  10 , in the state where electrical device  10  was mounted on wall  1 , an audio signal was transmitted from the smartphone to electrical device  10  via wireless communication and the volume was maximized to vibrate actuator  12 . That audio signal is a sweep signal whose frequency changes in the range of 20 Hz to 1500 Hz. Vibration of wall  1  at a position of 10 cm from the center of the electrical device was measured in the direction orthogonal to the Z-axis plus direction. 
     Similarly, for the electrical device in the comparative example, in the state where that electrical device was mounted on wall  1 , an audio signal was transmitted from the smartphone to that electrical device by wireless communication, and the volume was maximized to vibrate actuator  12  of that electrical device. That audio signal is also a sweep signal whose frequency changes in the range of 20 Hz to 1500 Hz. Vibration of wall  1  at a position of 10 cm from the center of that electrical device was measured in the direction orthogonal to the Z-axis plus direction. 
     In the case of using electrical device  10 , compared with the case of using the electrical device in the comparative example, the maximum value of the amplitude of the sound with frequencies between 100 Hz and 1000 Hz decreased from 3.08 μm (0.00308 mm) to 2.41 μm (0.00241 mm), which was a reduction of approximately 22%. In addition, in the case of using electrical device  10 , compared with the case of using the electrical device in the comparative example, the average value of the amplitude of the sound with frequencies between 100 Hz and 1000 Hz decreased by about 29%. In this way, by providing absorbing member  20 , the vibration of wall  1  was suppressed. 
     Electrical device  10  according to the embodiment has been described above. 
     Electrical device  10  according to the present embodiment is an electrical device that is mounted on wall  1  of a building, the electrical device including: actuator  12  that vibrates; and absorbing member  20  that absorbs vibration of actuator  12  and is positioned behind actuator  12  in a predetermined direction, where a direction from a back side to a front side of wall  1  is defined as a direction toward a front in the predetermined direction in a state where electrical device  10  is mounted on wall  1 . 
     According to this, in the state where electrical device  10  is mounted on wall  1 , when the Z-axis plus direction from the back side to the front side of wall  1  is defined as a direction toward a front in the Z-axis direction, absorbing member  20  is positioned behind actuator  12  in the Z-axis direction, so that it is possible to suppress the vibration of actuator  12  from being transmitted to wall  1  while suppressing electrical device  10  from becoming large in the direction orthogonal to the Z-axis direction. Accordingly, vibration of wall  1  can be easily suppressed without providing a sound absorbing material or the like on wall  1 . 
     In addition, in the state where electrical device  10  is mounted on wall  1 , electrical device  10  according to the present embodiment further includes attachment member  18  positioned behind actuator  12  in the Z-axis direction and attached to wall  1 , and absorbing member  20  includes first member  82  provided on the opposite side of attachment member  18  from actuator  12 . 
     According to this, the vibration of actuator  12  can be suppressed from being transmitted to attachment member  18  by first member  82 . By suppressing the vibration of attachment member  18  attached to wall  1  of electrical device  10  in this manner, the vibration of wall  1  can be more easily suppressed. 
     In addition, electrical device  10  of the present embodiment further includes main body member  16  to which actuator  12  is fixed, and support member  22  provided on the opposite side of attachment member  18  from actuator  12  and coupled to main body member  16 , and first member  82  is provided between attachment member  18  and support member  22 . 
     According to this, when actuator  12  vibrates, the vibration of actuator  12  is transmitted to support member  22  via main body member  16 , and support member  22  may vibrate, but the vibration of support member  22  can be suppressed from being transmitted to attachment member  18 . This makes it possible to suppress vibration of wall  1  more easily. 
     In addition, in electrical device  10  of the present embodiment, main body member  16  is provided between actuator  12  and attachment member  18 , and absorbing member  20  includes second member  84  provided between attachment member  18  and main body member  16 . 
     According to this, when actuator  12  vibrates, the vibration of actuator  12  is transmitted to main body member  16 , and main body member  16  may vibrate, but the vibration of main member  16  can be suppressed from being transmitted to attachment member  18 . This makes it possible to suppress vibration of wall  1  more easily. 
     In addition, in electrical device  10  of the present embodiment, first member  82  contacts attachment member  18  and support member  22 , and second member  84  contacts attachment member  18  and main body member  16 . 
     According to this, it is possible to suppress the vibration of attachment member  18 , support member  22 , and main body member  16 , so that the vibration of wall  1  can be suppressed more easily. 
     In addition, in electrical device  10  of the present embodiment, wall  1  includes socket component  3  that is engageable with attachment member  18 , and attachment member  18  is engaged with socket component  3  to be mounted on wall  1 . 
     According to this, electrical device  10  can be easily mounted on wall  1 . 
     In addition, in electrical device  10  according to the present embodiment, actuator  12  vibrates back and forth in the Z-axis direction in the state where electrical device  10  is mounted on wall  1 . 
     According to this, since absorbing member  20  is provided in the vibration direction of actuator  12 , the vibration of actuator  12  can be easily absorbed, and the vibration of wall  1  can be suppressed more easily. 
     In addition, electrical device  10  of the present embodiment further includes terminal  28  to which electric wire  5  for electrically connecting the external power source and actuator  12  is connected, and terminal  28  is connected to electric wire  5  from the direction orthogonal to the vibration direction of actuator  12 . 
     According to this, the vibration of actuator  12  can be suppressed from being transmitted to electric wire  5  via terminal  28 , and the vibration of wall  1  due to the vibration of electric wire  5  can be suppressed, so that the vibration of wall  1  can be more easily suppressed. 
     In addition, in electrical device  10  according to the present embodiment, electrical device  10  is a speaker. 
     According to this, it is possible to suppress the vibration of wall  1  due to the vibration of the speaker being transmitted to wall  1 . 
     Other embodiments, etc. 
     Although the electrical device according to one or more aspects has been described above based on the embodiment, the present disclosure is not limited to this embodiment. Forms obtained by applying various modifications to the present embodiment conceived by a person skilled in the art without departing from the spirit of the present disclosure may also be included in the present disclosure. 
     In the embodiment described above, the case where electrical device  10  is an embedded speaker has been described, but the present disclosure is not limited thereto. For example, the electrical device may be a hanging speaker that is not embedded in a wall, or a lighting device that includes a speaker. In addition, the electrical device may be an electrical device such as a blower having a fan, and in this case, the actuator may be a motor that rotates the fan. In addition, the electrical device may be a camera or the like, and in this case, the actuator may be an actuator that drives a camera lens or the like. 
     In the embodiment described above, the case where wall  1  of the building is included in the ceiling of room  2  inside the building has been described, but the present disclosure is not limited thereto. For example, the wall of the building may be a wall included in the floor of a room inside the building, a wall included in a side wall of a room inside the building, a wall included in an outer wall of the building, or the like. 
     In the embodiment described above, the case where actuator  12  vibrates back and forth in the Z-axis direction in a state where electrical device  10  is mounted on wall  1  has been described, but the present disclosure is not limited thereto. For example, the actuator may vibrate in a direction intersecting the Z-axis direction in a state where the electrical device is mounted on the wall. 
     In the embodiment described above, the case where absorbing member  20  has first member  82  and second member  84  has been described, but the present disclosure is not limited thereto. For example, absorbing member  20  may have only first member  82  or only second member  84  out of first member  82  and second member  84 . Specifically, for example, in the state where electrical device  10  is mounted on wall  1  included in the floor, that is, when electrical device  10  is mounted in the opposite direction to the embodiment described above, absorbing member  20  may have only second member  84  out of first member  82  and second member  84 . In addition, for example, even in the state where electrical device  10  is mounted on wall  1  included in the ceiling, the vibration absorption effect of actuator  12  can be obtained even if absorbing member  20  has only second member  84  out of first member  82  and second member  84  by attaching second member  84  to attachment member  18  and second shell member  64  of main body member  16  with double-sided tape or the like. 
     In the embodiment described above, the case where attachment member  18  is attached to wall  1  by being engaged with socket component  3  of wall  1  has been described, but the present disclosure is not limited thereto. For example, the attachment member may be attached to the wall by being screwed to the wall. 
     In addition, forms obtained by applying various modifications to above each embodiment conceived by a person skilled in the art or forms realized by arbitrarily combining the components and functions in each embodiment without departing from the spirit of the present disclosure are also included in this disclosure. 
     INDUSTRIAL APPLICABILITY 
     The present disclosure can be used for an electrical device mounted on a wall of a building.