Speaker devices and sound systems

Abstract

The speaker device (1A) can suppress vibration of the speaker device and play bass. The speaker device (1A) comprises: a first speaker (10A) having a first surface (11) connected to the indoor (J1) and a second surface (12) not connected to the indoor (J1); a second speaker (20A) having a first surface (21) connected to the outdoor (J2) and a second surface (22) not connected to the outdoor (J2); and a chamber (30A) in which a closed space is formed by surfaces forming a boundary. The second surface (12) of the first speaker (10A) and the second surface (22) of the second speaker (20A) are arranged at the boundary.

Description

Technical Field

[0001] The invention relates to a loudspeaker device and a sound system. Background Art

[0002] There is a technique in which a speaker device is provided with the back of the speaker facing the outside of the vehicle and an infinite baffle is provided (for example, see Patent Document 1). There is a technique in which a speaker device having a main speaker and an auxiliary speaker is provided with the sound emitting surface of the auxiliary speaker facing the back of the main speaker (for example, see Patent Documents 2 and 3).

[0003] Patent Document 1: Japanese Patent No. 5988874

[0004] Patent Document 2: Japanese Patent Application Laid-Open No. 9-74599

[0005] Patent Document 3: Japanese Patent No. 4079827

[0006] In order to play bass in a speaker device, a large enclosure is required. However, there are cases where a large enclosure cannot be installed, such as when the installation space of the speaker device is limited.

[0007] In addition, if the speaker device cannot be firmly mounted on other objects, the broadcast energy will not be converted into sound but into vibration. In addition, if the speaker device is to be installed in a complex place or the speaker device is required to be lightweight, the wall thickness of the speaker box may be reduced. In this case, it becomes difficult to mount the speaker box on other objects. Summary of the invention

[0008] The present invention provides a speaker device and an audio system capable of suppressing vibration of the speaker device and playing bass.

[0009] The speaker device of the present invention comprises: a first speaker having a first surface connected to an indoor room and a second surface not connected to the indoor room; a second speaker having a first surface connected to an outdoor room and a second surface not connected to the outdoor room; and a chamber in which a closed space is formed by surfaces forming a boundary, wherein the second surface of the first speaker and the second surface of the second speaker are arranged on the boundary toward the closed space side.

[0010] The acoustic system of the present invention comprises: the speaker device; and a phase control unit that generates two sound signals having a phase difference, namely, a first sound signal and a second sound signal, supplies the first sound signal to the first speaker, and supplies the second sound signal to the second speaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a cross-sectional view of the speaker device according to the first embodiment.

[0012] Figure 2 It is a side view of the speaker device according to the first embodiment.

[0013] Figure 3 It is a front view of the speaker device according to the first embodiment.

[0014] Figure 4 yes Figure 1 A-A line view in the figure.

[0015] Figure 5 This is a block diagram of the acoustic system according to the first embodiment.

[0016] Figure 6 It is a cross-sectional view of a speaker device according to a second embodiment.

[0017] Figure 7 It is a side view of the speaker device according to the second embodiment.

[0018] Figure 8 This is a block diagram of an acoustic system according to the second embodiment.

[0019] Fig. 9 It is a cross-sectional view of a speaker device according to a third embodiment.

[0020] Fig.10 It is a side view of the speaker device according to the third embodiment.

[0021] Fig.11 It is a cross-sectional view of a speaker device according to a fourth embodiment.

[0022] Fig.12 It is a cross-sectional view of a speaker device according to a fifth embodiment.

[0023] Fig.13 It is a cross-sectional view of a speaker device according to a sixth embodiment.

[0024] Fig.14 It is a side view of the speaker device according to the sixth embodiment.

[0025] Fig.15 yes Fig.13 B-B line view in the figure.

[0026] Fig.16 It is a front view of the speaker device involved in the 7th embodiment.

[0027] Fig.17 yes Fig.16 C-C line view in the figure.

[0028] Fig.18 yes Fig.16 D-D line view in.

[0029] Fig.19 This is a schematic diagram showing a model of the first speaker.

[0030] Fig. 20 Yes means Fig.19 The distortion curve of the sound of the first speaker model is shown.

[0031] Fig.21 This is a schematic diagram showing a model of a speaker device including a first speaker and a second speaker arranged in the same direction.

[0032] Fig. 22 Yes means Fig.21 The distortion curve of the sound of the model of the loudspeaker device is shown.

[0033] Fig.23 This is a schematic diagram showing a model of a speaker device including a first speaker and a second speaker arranged in opposite directions.

[0034] Fig.24 Yes means Fig.23 The distortion curve of the sound of the model of the loudspeaker device is shown. DETAILED DESCRIPTION

[0035] Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings. In addition, in the accompanying drawings, the size and scale of each part are appropriately different from the actual one. In addition, the embodiments described below are preferred specific examples of the present invention. Therefore, in this embodiment, various technically preferred limitations are imposed. However, the scope of the present invention is not limited to the above forms, unless the subject of limiting the present invention is specifically recorded in the following description.

[0036] Figure 1 It is a cross-sectional view of the speaker device 1A according to the first embodiment. Figure 2 It is a side view of the speaker device 1A. Figure 3 It is a front view of the speaker device 1A. Figure 4 yes Figure 1 A-A line view in the figure. Figure 1 to Figure 4 The speaker device 1A shown can be used as a vehicle-mounted speaker device mounted on a vehicle such as an automobile, for example. The speaker device 1A can be mounted on a vehicle door via a door trim, for example. The use of the speaker device 1A is not limited to vehicle-mounted use, and other uses are possible.

[0037] The speaker device 1A includes a first speaker 10A and a second speaker 20A. Figure 1, a part of the speaker device 1A is shown in cross section. The cross section is a cross section obtained by cutting the speaker device 1A at a plane including the axis Z1 of the first speaker 10A and the axis Z2 of the second speaker 20A. The axis Z1 is a line segment parallel to the vibration direction of the vibration plate 2 described later and passing through the center of the vibration plate 2. The direction of the axis Z1 is the direction in which the axis Z1 extends.

[0038] In the description of the first speaker 10A, the side where the diaphragm 2 is arranged in the direction of the axis Z1 is the front side, and the opposite side is the back side. Of the two surfaces separated in the direction of the axis Z1, the surface where the diaphragm 2 is arranged is the sound emitting surface, and the surface on the opposite side is the back side. The same is true for the axis Z2. In addition, three directions orthogonal to each other are defined as the X direction, the Y direction, and the Z direction. The Z direction is parallel to the direction of the axis Z1.

[0039] In the description of the chamber 30A described later, the right side in the figure is set as the front side, and the left side in the figure is set as the back side. In addition, in other embodiments described later, the front side and back side of the chamber are sometimes not the same side as the front side and back side of the first speaker, or the front side and back side of the second speaker.

[0040] The first speaker 10A and the second speaker 20A have the same structure, but the first speaker 10A and the second speaker 20A may have different structures. The first speaker 10A includes a diaphragm 2, a driving unit 3, and a speaker frame 4. The second speaker 20A includes a diaphragm 2, a driving unit 3, and a speaker frame 4. The axis Z1 and the axis Z2 are coaxial.

[0041] The vibration plate 2 is made of a sheet material and is a vibrating body that emits sound by vibration. The sheet material is obtained, for example, by hardening or curing a fiber substrate in a state where the resin material is impregnated. Examples of the resin material include acrylic resin, polyurethane, melamine resin, modified rubber resin, and phenolic resin. Examples of the fiber substrate include carbon fiber, aramid fiber, glass fiber, ceramic fiber, silica fiber, metal fiber, potassium titanate fiber, zirconium oxide fiber, polyacrylate fiber, polyphenylene sulfide fiber, vinylon fiber, rayon fiber, nylon fiber, polyester fiber, acrylic fiber, polypropylene fiber, polyethylene fiber, cotton fiber, hemp fiber, and cellulose fiber.

[0042] The vibration plate 2 vibrates in a direction along the axis Z1 or the axis Z2. The vibration plate 2 is conical. The shape of the vibration plate 2 is not limited to conical, and may be, for example, dome-shaped.

[0043] The driving unit 3 is a mechanism for driving the vibration plate 2 based on the input electrical signal. The driving unit 3 includes a magnetic circuit that generates a magnetic field and a voice coil connected to the vibration plate 2. The magnetic circuit includes a magnet and a yoke. The voice coil is input with an electrical signal and causes the vibration plate 2 to vibrate through the interaction of magnetic force with the magnet. Through this vibration, a sound based on the electrical signal is emitted from the vibration plate 2. In addition, the driving unit 3 is not limited to a structure having a voice coil and a magnet as long as it can drive the vibration plate 2 based on the electrical signal, and can be any structure.

[0044] The first speaker 10A has a first surface 11 communicating with the indoor room J1, and a second surface 12 not communicating with the indoor room J1. The second speaker 20A has a first surface 21 communicating with the outdoor room J2, and a second surface 22 not communicating with the outdoor room J2. Being in communication with the indoor room J1 means that the speaker is in contact with the space of the indoor room J1, and is not in contact with the internal space of the chamber 30A described later. Not being in communication with the indoor room J1 means that the speaker is in contact with the internal space of the chamber 30A, and is not in contact with the space of the indoor room J1. Being in communication with the outdoor room J2 means that the speaker is in contact with the space of the outdoor room J2, and is not in contact with the internal space of the chamber 30A. Not being in communication with the outdoor room J2 means that the speaker is in contact with the internal space of the chamber 30A, and is not in contact with the space of the outdoor room J2.

[0045] When the speaker device 1A is mounted in a car, the indoor J1 is the interior of the car, and the outdoor J2 is the exterior of the car. When the speaker device 1A is installed in the door of the car, when the door is opened, the first surface 11 of the first speaker 10A contacts the exterior of the car, but when the door is closed and the speaker contacts the interior of the car, the first surface 11 contacts the indoor J1. In addition, when the first surface 21 of the second speaker 20A contacts the space in the opening communicating with the exterior of the car, the first surface 21 communicates with the outdoor J2. Even when the interior of the car is communicating with the exterior of the car with the door or window closed, the interior is the indoor J1.

[0046] The first surface 11 of the first speaker 10A is a sound emitting surface, and the second surface 12 is a back surface. The first surface 21 of the second speaker 20A is a sound emitting surface, and the second surface 22 is a back surface. The sound emitting surface of the first speaker 10A communicates with the indoor space J1, and the sound emitting surface of the second speaker 20A communicates with the outdoor space J2.

[0047] The speaker device 1A has a chamber 30A for holding the first speaker 10A and the second speaker 20A. The chamber 30A is box-shaped and holds the first speaker 10A and the second speaker 20A. The chamber 30A includes a front panel 31A, a back panel 32A, a side panel 33A, a side panel 34A, a side panel 35A, and a side panel 36A. The front panel 31A and the back panel 32A are opposite to each other in the Z direction. The side panel 33A and the side panel 34A are opposite to each other in the X direction. The side panel 35A and the side panel 36A are opposite to each other in the Y direction. An opening 37A is formed in the side panel 33A. The opening 37A is formed in the center of the side panel 33A in the Z direction.

[0048] The chamber 30A forms a closed space by the surfaces forming the boundaries. The surfaces forming the boundaries include the front panel 31A, the back panel 32A, the side panel 33A, the side panel 34A, the side panel 35A, and the side panel 36A. The surfaces forming the boundaries include the back panel 42A of the first chamber 40A and the front panel 51A of the second chamber 50A described later. The surfaces forming the boundaries include the inner wall panel 71A, the inner wall panel 72A, and the inner wall panel 73A of the connecting portion 60A described later. The chamber 30A forms a closed internal space, i.e., a closed space, in a state where the first speaker 10A and the second speaker 20A are held. The closed space is formed by the surfaces forming the boundaries, including a case where the closed internal space is formed in a state where the first speaker 10A and the second speaker 20A are held.

[0049] Second surface 12 of first speaker 10A and second surface 22 of second speaker 20A are arranged at the boundary of chamber 30A facing the closed space side. Second surface 12 and second surface 22 are arranged at the boundary of chamber 30A facing the closed space side, including the case where second surface 12 and second surface 22 are arranged to contact the internal space of chamber 30A.

[0050] The chamber 30A is provided with a mounting piece 8. The mounting piece 8 extends outward from the side panels 33A to 36A of the chamber 30A. The speaker device 1A is mounted on other components via the mounting piece 8. Outside the speaker device 1A, the front side of the mounting piece 8 is the indoor J1, and the back side of the mounting piece 8 is the outdoor J2. The mounting piece 8 may be a flange, or a groove, etc.

[0051] The chamber 30A includes a first chamber 40A, a second chamber 50A, and a connection portion 60A. The connection portion 60A is disposed between the first chamber 40A and the second chamber 50A in the Z direction. The connection portion 60A connects the first chamber 40A and the second chamber 50A.

[0052] The first chamber 40A holds the first speaker 10A. The first chamber 40A includes a front plate 31A and a rear plate 42A that are opposed to each other in the Z direction. The first chamber 40A includes a first portion 43A of the side plate 33A, a first portion 44A of the side plate 34A, a first portion 45A of the side plate 35A, and a first portion 46A of the side plate 36A.

[0053] The front plate 31A is formed with an opening 38A for holding the first speaker 10A. The speaker frame 4 of the first speaker 10A is fixed to the peripheral edge of the opening 38A. The diaphragm 2 and the driving unit 3 of the first speaker 10A are accommodated in the first chamber 40A.

[0054] The first portion 43A of the side panel 33A and the first portion 44A of the side panel 34A face each other in the X direction. The first portion 45A of the side panel 35A and the first portion 46A of the side panel 36A face each other in the Y direction. In the X direction, an opening 47A is formed between the back panel 42A and the side panel 34A.

[0055] The second chamber 50A holds the second speaker 20A. The second chamber 50A includes a front plate 51A and a rear plate 32A that are opposed to each other in the Z direction. The second chamber 50A includes a second portion 53A of the side plate 33A, a second portion 54A of the side plate 34A, a second portion 55A of the side plate 35A, and a second portion 56A of the side plate 36A.

[0056] The front plate 51A is formed with an opening 57A for holding the second speaker 20A. The speaker frame 4 of the second speaker 20A is fixed to the peripheral edge of the opening 57A. The diaphragm 2 and the driving unit 3 of the second speaker 20A are accommodated in the second chamber 50A.

[0057] The second portion 53A of the side panel 33A and the second portion 54A of the side panel 34A face each other in the X direction. The second portion 55A of the side panel 35A and the second portion 56A of the side panel 36A face each other in the Y direction. In the X direction, an opening 58A is formed between the front panel 51A and the side panel 34A.

[0058] The connection portion 60A includes an inner wall plate 71A and a third portion 64A of the side surface plate 34A facing each other in the X direction. The internal space of the connection portion 60A communicates with the internal space of the first chamber 40A and the internal space of the second chamber 50A through the opening 47A and the opening 58A.

[0059] The internal space of the chamber 30A includes the internal space of the first chamber 40A, the internal space of the second chamber 50A, and the internal space of the connecting portion 60A. The internal space of the chamber 30A is a closed space and is not connected to the indoor J1 and the outdoor J2. The back surface of the first speaker 10A, that is, the second surface 12, and the back surface of the second speaker 20A, that is, the second surface 22, are in contact with the internal space of the chamber 30A.

[0060] An open space J3 communicating with the outside J2 is formed on the front side of the second speaker 20A. The open space J3 communicates with the outside J2 through the opening 37A. The open space J3 includes a space formed in the Z direction between the back plate 42A of the first chamber 40A and the front plate 51A of the second chamber 50A.

[0061] like Figure 4 As shown, the open space J3 is separated from the internal space of the chamber 30A by the inner wall plate 71A, the inner wall plate 72A and the inner wall plate 73A. The inner wall plate 72A and the inner wall plate 73A are arranged outside the second speaker 20A in the Y direction. The inner wall plate 72A is opposite to the side panel 35A in the Y direction. The inner wall plate 73A is opposite to the side panel 36A in the Y direction.

[0062] Next, refer to Figure 5 The acoustic system 86A according to the first embodiment will be described. Figure 5 86A is a block diagram of an audio system. The audio system 86A includes a speaker device 1A and a phase control device 80A. The phase control device 80A includes a control unit 81. The control unit 81 controls the electrical signal S1 and the electrical signal S2 output to the first speaker 10A and the second speaker 20A. The control unit 81 includes a processing circuit 82 such as a CPU (Central Processing Unit) or an FPGA (Field Programmable Gate Array) and a storage circuit 83 such as a semiconductor memory.

[0063] The storage circuit 83 stores various parameters used for performing the control program and the phase control of the electric signal. In addition, the storage circuit 83 functions as a work area of ​​the processing circuit 82. The processing circuit 82 reads the control program from the storage circuit 83. The processing circuit 82 functions as a control center of the speaker device 1A by executing the read control program. The control unit 81 outputs the electric signal S1 to the first speaker 10A and outputs the electric signal S2 to the second speaker 20A.

[0064] The processing circuit 82 functions as a phase control unit 85A that controls the phase of the electrical signal S1 output to the first speaker 10A and the electrical signal S2 output to the second speaker 20A. The processing circuit 82 includes a delay circuit 84. The phase control unit 85A generates two sound signals having a phase difference, namely, a first sound signal and a second sound signal. The first sound signal is the electrical signal S1. The second sound signal is the electrical signal S2.

[0065] The processing circuit 82 generates the electric signal S1 and the electric signal S2 of opposite phases to each other. As a result, the vibration plate 2 of the first speaker 10A and the vibration plate 2 of the second speaker 20A vibrate in opposite directions to each other. The "vibration in opposite directions" mentioned here means that when the vibration plate 2 of the second speaker 20A moves to the front side, the vibration plate 2 of the first speaker 10A moves to the back side, and when the vibration plate 2 of the second speaker 20A moves to the back side, the vibration plate 2 of the first speaker 10A moves to the front side.

[0066] For example, when the vibration plate 2 of the second speaker 20A moves to the back side, the vibration plate 2 of the first speaker 10A moves to the front side. If the vibration plate 2 of the second speaker 20A moves to the back side, the vibration is transmitted in the chamber 30A. In the chamber 30A, the vibration is transmitted in the order of the internal space of the second chamber 50A, the internal space of the connecting portion 60A, and the internal space of the first chamber 40A. As described above, when the vibration of the vibration plate 2 of the second speaker 20A moves to the back side, the vibration is transmitted to the vibration plate 2 of the first speaker 10A in the internal space of the first chamber 40A in such a manner that the vibration plate 2 is pushed from the back side to the front side. The phase control unit 85 performs phase control on the electric signal S1 in such a manner that the vibration plate 2 of the first speaker 10A moves from the back side to the front side, and thus, the density of air can be suppressed in the internal space of the chamber 30A. Suppressing the density of air means suppressing the pressure change inside the chamber 30A.

[0067] Similarly, for example, when the diaphragm 2 of the second speaker 20A moves toward the front side, the diaphragm 2 of the first speaker 10A moves toward the back side. If the diaphragm 2 of the second speaker 20A moves toward the front side, the vibration is transmitted in the chamber 30A. In the chamber 30A, the vibration is transmitted in the order of the internal space of the second chamber 50A, the internal space of the connecting portion 60A, and the internal space of the first chamber 40A. As described above, when the vibration of the diaphragm 2 of the second speaker 20A moves toward the front side, the vibration is transmitted to the diaphragm 2 of the first speaker 10A in the internal space of the first chamber 40A in a manner that the diaphragm 2 is pulled from the back side. The phase control unit 85 performs phase control on the electric signal S1 in a manner that causes the diaphragm 2 of the first speaker 10A to move from the front side to the back side, and thus, the density of air in the internal space of the chamber 30A can be suppressed.

[0068] As described above, the direction in which the vibration plate 2 of the first speaker 10A is displaced is opposite to the direction in which the vibration plate 2 of the second speaker 20A is displaced. Therefore, the phase of the electrical signal S1 and the phase of the electrical signal S2 are in an anti-phase relationship. However, in the chamber 30A, the vibration of the second speaker 20A is transmitted to the first speaker 10A via the air in the internal space. Therefore, it takes time until the vibration of the second speaker 20A is transmitted to the first speaker 10A.

[0069] The delay circuit 84 can delay the electric signal S1 relative to the electric signal S2. The delay circuit 84 delays the electric signal S1 relative to the electric signal S2 in accordance with the transmission path of the vibration from the second speaker 20A to the first speaker 10A. The transmission path of the vibration referred to here refers to the transmission path of the vibration through the air inside the chamber 30A. The delay circuit 84 delays the electric signal S1 in a manner that makes the electric signal vibrate together with the first speaker 10A at the timing when the vibration of the second speaker 20A is transmitted to the first speaker 10A via the air inside the chamber 30A. The phase control unit 85A performs phase control on the electric signal S1 and the electric signal S2 in a manner that the phase of the vibration transmitted from the second speaker 20A to the first speaker 10A and the phase of the displacement of the diaphragm 2 caused by the electric signal S1 input to the first speaker 10A become in phase. In addition, when the vibration transmitted through the transmission path is small, the delay circuit 84 can be omitted. When the volume of the chamber 30A is small and the transmission path is short, a phase difference is unlikely to occur, and thus the delay circuit 84 may be omitted. In particular, the delay circuit 84 may be omitted when the resonance frequency of the chamber 30A is low (tens to hundreds of Hz).

[0070] In the speaker device 1A, the back surface of the first speaker 10A and the back surface of the second speaker 20A are in contact with the internal space of the chamber 30A. The vibration caused by the diaphragm 2 of the second speaker 20A is transmitted through the internal space of the chamber 30A to the diaphragm 2 of the first speaker 10A. The speaker device 1A controls the density of the internal space of the chamber 30A.

[0071] In such a speaker device 1A, the density of the air in the internal space of the chamber 30A can be suppressed, and the vibration direction of the air in the chamber 30A can be matched with the vibration direction of the vibration plate 2 of the first speaker 10A. The first speaker 10A and the second speaker 20A are arranged on the same axis and arranged in the same direction. Therefore, when the vibration plate 2 of the first speaker 10A moves to compress (or expand) the internal space of the chamber 30A, the vibration plate 2 of the second speaker 20A moves to expand (or compress) the internal space of the chamber 30A, thereby suppressing the density of the air in the internal space of the chamber 30A. In addition, when the vibration plate 2 of the first speaker 10A moves toward the front side of the chamber 30A, the vibration plate 2 of the second speaker 20A moves toward the back side of the chamber 30A, thereby suppressing the movement of the center of gravity of the chamber 30A and suppressing the vibration of the chamber 30A.

[0072] In the speaker device 1A, the sound emitting surface of the second speaker 20A is connected to the outdoor J2. According to such a speaker device 1A, the second speaker 20A functions as an infinite baffle, thereby being able to reproduce bass without requiring a large speaker box. Therefore, the speaker device 1A is prevented from being enlarged, and bass reproduction is achieved.

[0073] In the speaker device 1A, the internal space of the chamber 30A can be made into a sealed closed space, and impurities can be prevented from entering the internal space of the chamber 30A from the outside J2. When the speaker device 1A is applied as a vehicle speaker, impurities such as water and dust can be prevented from entering the internal space of the chamber 30A from the outside J2, which is the space outside the vehicle. Since impurities can be prevented from entering the inside of the chamber 30A, impurities can be prevented from entering the indoor J1 via the chamber 30A.

[0074] Next, a speaker device 1B according to a second embodiment will be described. Figure 6 It is a cross-sectional view of the speaker device 1B. Figure 7 1B is a side view of the speaker device 1B. The speaker device 1B according to the second embodiment is different from the speaker device 1A according to the first embodiment in that the second speaker 20B is arranged differently, the structure of the chamber 30B is different, and the Figure 8The phase control performed by the phase control unit 85B shown is different. In the description of the second embodiment, the differences from the first embodiment are mainly described. The speaker device 1B includes a first speaker 10A and a second speaker 20B. The second speaker 20B is arranged opposite to the second speaker 20A of the first embodiment.

[0075] The second speaker 20B has a first surface 21 connected to the outdoor J2 and a second surface 22 not connected to the outdoor J2. The first surface 21 of the second speaker 20B is the back surface, and the second surface 22 is the sound emitting surface. The back surface of the second speaker 20B is connected to the outdoor J2. In the Z direction, the back surface of the first speaker 10A and the back surface of the second speaker 20B are opposite to each other.

[0076] The speaker device 1B has a chamber 30B for holding the first speaker 10A and the second speaker 20B. The chamber 30B is box-shaped and holds the first speaker 10A and the second speaker 20B. The chamber 30B includes a front panel 31A, a back panel 32A, a side panel 33B, a side panel 34A, a side panel 35A, and a side panel 36A. The front panel 31A and the back panel 32A are opposite to each other in the Z direction. The side panel 33B and the side panel 34A are opposite to each other in the X direction. An opening 37B is formed in the side panel 33B. The opening 37B is formed at a position corresponding to the second speaker 20B in the Z direction. When viewed from the X direction, the diaphragm 2 and the driving unit 3 of the second speaker 20B are arranged in the opening 37B.

[0077] The chamber 30B includes a first chamber 40A, a second chamber 50B, and a connection portion 60B. The connection portion 60B is disposed between the first chamber 40A and the second chamber 50B in the Z direction. The connection portion 60B connects the first chamber 40A and the second chamber 50B.

[0078] The first chamber 40A includes a first portion 43A of the side panel 33B, a first portion 44A of the side panel 34A, a first portion 45A of the side panel 35A, and a first portion 46A of the side panel 36A.

[0079] The first portion 43A of the side panel 33B and the first portion 44A of the side panel 34A face each other in the X direction.

[0080] The second chamber 50B holds the second speaker 20B. The second chamber 50B includes an inner wall plate 51B and a back plate 32A that are opposite to each other in the Z direction. The second chamber 50B includes a second portion 53B of the side plate 33B, a second portion 54B of the side plate 34A, a second portion 55B of the side plate 35A, and a second portion 56B of the side plate 36A.

[0081] The inner wall plate 51B is formed with an opening 57B for holding the second speaker 20B. The speaker frame 4 of the second speaker 20B is fixed to the peripheral portion surrounding the opening 57B. The diaphragm 2 and the driving unit 3 of the second speaker 20B are arranged outside the second chamber 50B. The second speaker 20B is arranged between the back plate 42A of the first chamber 40A and the inner wall plate 51B of the second chamber 50B in the Z direction.

[0082] The second portion 53B of the side panel 33B and the second portion 54B of the side panel 34A face each other in the X direction. The second portion 55B of the side panel 35A and the second portion 56B of the side panel 36A face each other in the Y direction. In the X direction, an opening 58B is formed between the inner wall plate 51B and the side panel 34A.

[0083] The connecting portion 60B includes the inner wall plate 71B and the third portion 64B of the side plate 34A which are opposite to each other in the X direction. The internal space of the connecting portion 60B communicates with the internal space of the first chamber 40A and the internal space of the second chamber 50B. The second chamber 50B and the connecting portion 60B communicate through the opening 58B. The connecting portion 60B communicates with the first chamber 40A through the opening 47A.

[0084] The internal space of the chamber 30B includes the internal space of the first chamber 40A, the internal space of the second chamber 50B, and the internal space of the connecting portion 60B. The internal space of the chamber 30B is a closed space and is not connected to the indoor J1 and the outdoor J2. The back surface of the first speaker 10A, that is, the second surface 12, and the sound emitting surface of the second speaker 20B, that is, the second surface 22, are in contact with the internal space of the chamber 30B.

[0085] An open space J4 communicating with the outside J2 is formed on the back side of the second speaker 20B. The open space J4 communicates with the outside J2 through the opening 37B. The open space J4 is formed between the back plate 42A of the first chamber 40A and the inner wall plate 51B of the second chamber 50B in the Z direction.

[0086] The open space J4 is separated from the internal space of the chamber 30B by the inner wall plate 71B, the inner wall plate 72B and the inner wall plate 73B. The inner wall plate 72B and the inner wall plate 73B are arranged outside the second speaker 20B in the Y direction. The inner wall plate 72B is opposite to the side panel 35A in the Y direction. The inner wall plate 73B is opposite to the side panel 36A in the Y direction.

[0087] Next, refer to Figure 8 The acoustic system 86B according to the second embodiment will be described. Figure 8 80B is a block diagram of an audio system 86B. The audio system 86B includes a speaker device 1B and a phase control device 80B. The phase control device 80B includes a control unit 81.

[0088] The phase control device 80B applied to the speaker device 1B has the same device configuration as the phase control device 80A of the first embodiment. The control unit 81 outputs the electric signal S1 to the first speaker 10A and outputs the electric signal S2 to the second speaker 20B.

[0089] The processing circuit 82 generates the electric signal S1 and the electric signal S2 of the same phase. As a result, the vibration plate 2 of the first speaker 10A and the vibration plate 2 of the second speaker 20B vibrate in the same direction. The "vibration in the same direction" mentioned here means that when the vibration plate 2 of the second speaker 20B moves toward the front side, the vibration plate 2 of the first speaker 10A moves toward the front side, and when the vibration plate 2 of the second speaker 20B moves toward the back side, the vibration plate 2 of the first speaker 10A moves toward the back side.

[0090] For example, when the vibration plate 2 of the second speaker 20B moves toward the front side, the vibration plate 2 of the first speaker 10A moves toward the front side. If the vibration plate 2 of the second speaker 20B moves toward the front side, the vibration is transmitted in the chamber 30B. In the chamber 30B, the vibration is transmitted in the order of the internal space of the second chamber 50B, the internal space of the connecting portion 60B, and the internal space of the first chamber 40A. As described above, when the vibration of the vibration plate 2 of the second speaker 20B moves toward the front side, the vibration is transmitted to the vibration plate 2 of the first speaker 10A in the internal space of the first chamber 40A in such a manner that the vibration plate 2 is pushed and pressed from the back side to the front side. The phase control unit 85B performs phase control on the electric signal S1 in such a manner that the vibration plate 2 of the first speaker 10A moves from the back side to the front side, and thus, the density of air in the internal space of the chamber 30B can be suppressed.

[0091] Similarly, for example, when the diaphragm 2 of the second speaker 20B moves to the back side, the diaphragm 2 of the first speaker 10A moves to the back side. If the diaphragm 2 of the second speaker 20B moves to the back side, the vibration is transmitted in the chamber 30B. In the chamber 30B, the vibration is transmitted in the order of the internal space of the second chamber 50B, the internal space of the connecting portion 60B, and the internal space of the first chamber 40A. As described above, when the vibration of the diaphragm 2 of the second speaker 20B moves to the back side, the vibration is transmitted to the diaphragm 2 of the first speaker 10A in the internal space of the first chamber 40A in a manner that the diaphragm 2 is pulled to the back side. The phase control unit 85B performs phase control on the electric signal S1 in a manner that the diaphragm 2 of the first speaker 10A moves from the front side to the back side, and thus, the density of air in the internal space of the chamber 30B can be suppressed.

[0092] The delay circuit 84 can delay the electric signal S1 relative to the electric signal S2. The delay circuit 84 delays the electric signal S1 relative to the electric signal S2 in accordance with the transmission path of the vibration from the second speaker 20B to the first speaker 10A. The transmission path of the vibration referred to here refers to the transmission path of the vibration through the air inside the chamber 30B. The delay circuit 84 delays the electric signal S1 in a manner that makes the electric signal vibrate together with the first speaker 10A at the timing when the vibration of the second speaker 20B is transmitted to the first speaker 10A via the air inside the chamber 30B. The phase control unit 85B performs phase control on the electric signal S1 and the electric signal S2 in a manner that the phase of the vibration transmitted from the second speaker 20B to the first speaker 10A and the phase of the displacement of the diaphragm 2 caused by the electric signal S1 input to the first speaker 10A become in phase. In addition, when the vibration transmitted through the transmission path is small, the delay circuit 84 can be omitted. When the volume of the chamber 30B is small and the transmission path is short, a phase difference is unlikely to occur, and thus the delay circuit 84 may be omitted. In particular, the delay circuit 84 may be omitted when the resonance frequency of the chamber 30B is low (tens to hundreds of Hz).

[0093] In the speaker device 1B of the second embodiment, similarly to the speaker device 1A of the first embodiment, it is possible to suppress density of the air in the internal space of the chamber 30B and to suppress movement of the center of gravity of the chamber 30B.

[0094] Next, a speaker device 1C according to a third embodiment will be described. Fig. 9 It is a cross-sectional view of the speaker device 1C. Fig.10 1 is a side view of the speaker device 1C. The chamber 30C of the speaker device 1C includes a first chamber 40C for holding the first speaker 10B, a second chamber 50C for holding the second speaker 20A, and a connecting portion 60C connecting the first chamber 40C and the second chamber 50C. The first speaker 10B is arranged opposite to the first speaker 10A of the first embodiment.

[0095] The first surface 11 of the first speaker 10A is a sound emitting surface, and the second surface 12 is a back surface. The first surface 21 of the second speaker 20A is a back surface, and the second surface 22 is a sound emitting surface. The sound emitting surface of the first speaker 10B is connected to the indoor J1, and the back surface of the second speaker 20B is connected to the outdoor J2. In the Z direction, the sound emitting surface of the first speaker 10B and the sound emitting surface of the second speaker 20A are opposite. In the speaker device 1C, the back surface of the first speaker 10B and the sound emitting surface of the second speaker 20A are in contact with the internal space of the chamber 30C.

[0096] The first chamber 40C includes a front panel 31C and an inner wall panel 42C that are opposite to each other in the Z direction. The first speaker 10B is mounted on the opening of the inner wall panel 42C. The back of the first speaker 10B is opposite to the front panel 31C in the Z direction. The second chamber 50C includes a back panel 32C and an inner wall panel 51C that are opposite to each other in the Z direction. The second speaker 20A is mounted on the opening of the back panel 32C. The driving unit 3 of the second speaker 20A extends outward from the back panel 32C in the Z direction.

[0097] A communication space J5 communicating with the room J1 is formed between the first chamber 40C and the second chamber 50C. The communication space J5 is formed between the inner wall plate 42C and the inner wall plate 51C. The communication space J5 communicates with the room J1 through an opening 37C formed in the side plate 33C of the chamber 30C.

[0098] The processing circuit 82 of the phase control device 80B applied to the speaker device 1C can generate the electric signal S1 and the electric signal S2 in phase. The delay circuit 84 can delay the electric signal S1 relative to the electric signal S2. In the speaker device 1C of the third embodiment, the density of the air in the internal space of the chamber 30C can be suppressed, and the center of gravity of the chamber 30C can be suppressed from shifting, similarly to the speaker device 1B of the second embodiment.

[0099] Fig.11 It is a cross-sectional view of the speaker device 1D according to the fourth embodiment. The chamber 30D of the speaker device 1D holds the first speaker 10A and the second speaker 20A.

[0100] The first surface 11 of the first speaker 10A is a sound emitting surface, and the second surface 12 is a back surface. The first surface 21 of the second speaker 20A is a back surface, and the second surface 22 is a sound emitting surface. The sound emitting surface of the first speaker 10A is connected to the indoor J1. The back surface of the second speaker 20A is connected to the outdoor J2. In the Z direction, the back surface of the first speaker 10A and the sound emitting surface of the second speaker 20A are opposite to each other. In the speaker device 1D, the back surface of the first speaker 10A and the sound emitting surface of the second speaker 20A are in contact with the internal space of the chamber 30D.

[0101] The processing circuit 82 of the phase control device 80B applied to the speaker device 1D can generate the electric signals S1 and S2 in phase. In the speaker device 1D of the fourth embodiment, the density of the air in the internal space of the chamber 30D can be suppressed similarly to the speaker device 1A of the first embodiment.

[0102] Fig.12 It is a cross-sectional view of the speaker device 1E according to the fifth embodiment. The chamber 30E of the speaker device 1E holds the first speaker 10A and the second speaker 20B.

[0103] The first surface 11 of the first speaker 10A is a sound emitting surface, and the second surface 12 is a back surface. The first surface 21 of the second speaker 20B is a sound emitting surface, and the second surface 22 is a back surface. The sound emitting surface of the first speaker 10A is in contact with the space connected to the indoor J1. The sound emitting surface of the second speaker 20B is in contact with the space connected to the outdoor J2. In the Z direction, the back surface of the first speaker 10A and the back surface of the second speaker 20B are opposite to each other. In the speaker device 1E, the back surface of the first speaker 10A and the back surface of the second speaker 20B are in contact with the internal space of the chamber 30D.

[0104] The processing circuit 82 of the phase control device 80A applied to the speaker device 1E generates the electric signal S1 and the electric signal S2 of opposite phases. In the speaker device 1E of the fifth embodiment, the density of the air in the internal space of the chamber 30E can be suppressed similarly to the speaker device 1A of the first embodiment.

[0105] Fig.13 It is a cross-sectional view of a speaker device 1F according to a sixth embodiment. Fig.14 It is a side view of the speaker device 1F. Fig.15 yes Fig.13 The speaker device 1F according to the sixth embodiment is different from the speaker device 1B according to the second embodiment in that the open space J6 is continuous in the X direction and that connection parts 60F are provided on both sides of the second speaker 20B in the Y direction.

[0106] Speaker device 1F includes first speaker 10A, second speaker 20B, and chamber 30F. Chamber 30F includes first chamber 40A for holding first speaker 10A, second chamber 50B for holding second speaker 20B, and connection portion 60F for connecting first chamber 40A and second chamber 50B.

[0107] In the chamber 30F of the speaker device 1F, the opening 37F and the opening 38F are provided in the side panel 33F and the side panel 34F which are opposite to each other in the X direction. The opening 37F is provided in the side panel 33F, and the opening 38F is provided in the side panel 34F. The open space J6 is formed from the opening 37F to the opening 38F in the X direction. The connecting portion 60F is formed between the side panel 35F and the side panel 36F in the Y direction.

[0108] In the speaker device 1F of the sixth embodiment, similarly to the speaker device 1B of the second embodiment, it is possible to suppress density of the air in the internal space of the chamber 30F and to suppress movement of the center of gravity of the chamber 30F.

[0109] Next, a speaker device 1G according to a seventh embodiment will be described. Fig.16It is a front view of the speaker device 1G. Fig.17 yes Fig.16 C-C line view in the figure. Fig.18 yes Fig.16 D-D line view in. Fig.17 The cross-sectional shape of the speaker device 1G shown is similar to Figure 2 The cross-sectional shape of the speaker device 1B according to the second embodiment shown is the same. Fig.18 The cross-sectional shape of the speaker device 1G shown is Fig.17 The cross-sectional shape shown is obtained by turning it upside down.

[0110] The speaker device 1G includes a first speaker 10A, a second speaker 20B, and a chamber 30G. The chamber 30G includes a first chamber 40G for holding the first speaker 10A, a second chamber 50G for holding the second speaker 20B, and a connecting portion 60G connecting the first chamber 40G and the second chamber 50G.

[0111] The chamber 30G includes a front plate 31G, a rear plate 32G, and a side plate 33G. The side plate 33G is formed in a cylindrical shape. The side plate 33G is formed so as to surround the axis Z1 and the axis Z2.

[0112] The connection portion 60G is formed between the first cavity 40G and the second cavity 50G in the Z direction. The internal space of the connection portion 60G communicates with the internal space of the first cavity 40G and the internal space of the second cavity 50G. The cross-sectional shape of the connection portion 60G is fan-shaped.

[0113] The side panel 33G is formed with an opening 37G. An open space J7 communicating with the outside J2 is formed on the back side of the second speaker 20B. The open space J7 communicates with the outside J2 through the opening 37G. The opening 37G and the connection 60G are alternately arranged in the circumferential direction of the side panel 33G. The first chamber 40G and the second chamber 50G are connected by, for example, three connection portions 60G.

[0114] In the speaker device 1G of the seventh embodiment, similarly to the speaker device 1B of the second embodiment, it is possible to suppress density of the air in the internal space of the chamber 30G and to suppress movement of the center of gravity of the chamber 30G.

[0115] The outer shape of the chamber 30G of the speaker device 1G is circular. The speaker device 1G can also be assembled in the central opening of the spare tire. For example, the speaker device 1G can be held on the spare tire in the trunk of the vehicle, the first surface 11 of the first speaker 10A is connected to the vehicle interior, and the first surface 21 of the second speaker 20B is connected to the outside of the vehicle.

[0116] Next, refer to Fig.19 and Fig. 20 , the distortion of the sound of the model of the first speaker 10A is described. Fig.19 1 is a schematic diagram showing a model of the first speaker 10A. The right side in the figure is the positive direction, and the left side in the figure is the negative direction. The sound emitting surface of the first speaker 10A is arranged in the positive direction, and the back surface is arranged in the negative direction.

[0117] Fig. 20 Yes means Fig.19 The curve of sound distortion of the model of the first speaker 10A is shown. The horizontal axis represents the electric signal, and the vertical axis represents the displacement of the diaphragm 2. Fig. 20 The curve G1 shown shows the relationship between the electric signal of the model of the first speaker 10A and the displacement of the diaphragm 2. In the speaker, the displacement of the diaphragm 2 in the positive direction and the negative direction with respect to the electric signal is not symmetrical due to the structure. This is a distortion of the sound, and is a second-order distortion.

[0118] Next, refer to Fig.21 and Fig. 22 , the distortion of sound of a model of a speaker device 91 including a first speaker 10A and a second speaker 20A arranged in the same direction will be described. Fig.21 1 is a schematic diagram showing a model of the speaker device 91. In the speaker device 91, the sound emitting surface of the first speaker 10A is arranged in the positive direction and the back surface is arranged in the negative direction. The sound emitting surface of the second speaker 20A is arranged in the positive direction and the back surface is arranged in the negative direction.

[0119] Fig. 22 Yes means Fig.21 The distortion curve of the sound of the model of the speaker device 91 is shown. Fig. 22 The curve G2 shown is a curve showing the relationship between the electric signal of the model of the second speaker 20A and the displacement of the diaphragm 2. When the first speaker 10A and the second speaker 20A are arranged in the same direction and sound is output, the displacement of the diaphragm 2 of the first speaker 10A and the displacement of the diaphragm 2 of the second speaker 20A show the same distortion.

[0120] Next, refer to Fig.23 and Fig.24 , the distortion of sound of a model of a speaker device 92 including a first speaker 10A and a second speaker 20B arranged in opposite directions will be described. Fig.23 1 is a schematic diagram showing a model of the speaker device 92. In the speaker device 92, the sound emitting surface of the first speaker 10A is arranged in the positive direction and the back surface is arranged in the negative direction. The sound emitting surface of the second speaker 20B is arranged in the negative direction and the back surface is arranged in the positive direction.

[0121] Fig.24 Yes means Fig.23The distortion curve of the sound of the model of the speaker device 92 is shown. Fig.24 The curve G3 shown is a curve showing the relationship between the electric signal of the model of the second speaker 20B and the displacement of the vibration plate 2. The speaker device 92 outputs the electric signal S1 and the electric signal S2 of opposite phases to the first speaker 10A and the second speaker 20B. The displacement of the vibration plate 2 generated by the speaker device 92 in this case is as shown by the curve G3, and the distortion is reduced. The curve G3 is symmetrical with the 0 point as the center in the positive direction and the negative direction. As a result, it becomes a third-order distortion with little influence on the sound quality.

[0122] The above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the above-described embodiments, and various changes and additions can be made without departing from the gist of the present invention.

[0123] In the above-mentioned embodiment, the indoor J1 and the outdoor J2 are illustrated, but the indoor J1 and the outdoor J2 may be reversed. Figure 1 In the first embodiment shown, the outdoor is indicated by reference numeral J1, and the indoor is indicated by reference numeral J2. In this case, the speaker indicated by reference numeral 10A is the second speaker, and the speaker indicated by reference numeral 20A is the first speaker. In the second to seventh embodiments, the indoor J1 and the outdoor J2 may be reversed.

[0124] In the speaker device 1A, the second surface 12 of the first speaker 10A may be a sound emitting surface. In this case, the back surface of the first speaker 10A is connected to the room J1, and the sound emitting surface is not connected to the room J1. In the speaker device 1A, the second surface 12 of the first speaker 10A may be a sound emitting surface, and the second surface 22 of the second speaker 20A may be a sound emitting surface. In the speaker device 1A, the second surface 12 of the first speaker 10A may be a sound emitting surface, and the second surface 22 of the second speaker 20A may be a back surface. In the speaker device 1A, the sound emitting surfaces of the first speaker 10A and the second speaker 20A may be arranged to face each other.

[0125] In the above embodiment, the first speaker 10A and the second speaker 20A are supplied with audio signals of opposite phases, but audio signals other than opposite phases may be supplied. In the above embodiment, the first speaker 10A and the second speaker 20B are supplied with audio signals of the same phase, but audio signals other than the same phase may be supplied.

[0126] In the aforementioned embodiment, the first speaker 10A and the second speaker 20A are arranged on the same axis, but the arrangement of the first speaker 10A and the second speaker 20A is not limited to being on the same axis. The axis Z1 of the first speaker 10A and the axis Z2 of the second speaker may be parallel, and the first speaker 10A and the second speaker 20A may not overlap when viewed from the direction along the axis Z1 of the first speaker 10A.

[0127] The axis Z1 of the first speaker 10A and the axis Z2 of the second speaker 20A may not be parallel to each other. The axis Z1 may be inclined with respect to the axis Z2.

[0128] In the above-mentioned embodiment, the phase control unit 85A may change the phase control according to the frequency. For example, the phase control unit 84A may not change the phase when the frequency is 100 Hz or less, and may reverse the phase when the frequency exceeds 100 Hz.

[0129] Description of the label

[0130] 1A, 1B, 1C, 1D, 1E, 1F, 1G…speaker device, 10A, 10B…1st speaker, 11…1st surface, 12…2nd surface, 20A, 20B…2nd speaker, 21…1st surface, 22…2nd surface, 30A, 30B, 30C, 30D, 30E, 30F, 30G…chamber, 85A, 85B…phase control unit, 86A, 86B…sound system, J1…indoor, J2…outdoor, Z1…axis line, Z2…axis line.

Claims

1. A speaker device, comprising: A first speaker having a first surface communicating with the indoor room and a second surface not communicating with the indoor room; a second speaker having a first surface communicating with the outside of the room and a second surface not communicating with the outside of the room; and A chamber with a closed space formed by the faces forming the boundaries, The second surface of the first speaker and the second surface of the second speaker are arranged at the boundary so as to face the closed space side.

2. The speaker device according to claim 1, wherein The second surface of the first speaker is a rear surface, and the second surface of the second speaker is a rear surface.

3. The speaker device according to claim 1, wherein The second surface of the first speaker is a sound emitting surface, and the second surface of the second speaker is a sound emitting surface.

4. The speaker device according to claim 2 or 3, wherein: The first speaker and the second speaker are supplied with sound signals of opposite phases.

5. The speaker device according to claim 4, wherein The first speaker and the second speaker are coaxially arranged in the same direction.

6. The speaker device according to claim 1, wherein The second surface of the first speaker is a rear surface, and the second surface of the second speaker is a sound emitting surface.

7. The speaker device according to claim 1, wherein The second surface of the first speaker is a sound emitting surface, and the second surface of the second speaker is a back surface.

8. The speaker device according to claim 6 or 7, wherein: The first speaker and the second speaker are supplied with sound signals having the same phase.

9. The speaker device according to claim 8, wherein The first speaker and the second speaker are arranged coaxially so that their back surfaces face each other.

10. The speaker device according to claim 8, wherein The first speaker and the second speaker are arranged so that their sound emitting surfaces face each other.

11. The speaker device according to any one of claims 1 to 3, 5 to 7, 9 and 10, wherein: The axis line of the first speaker and the axis line of the second speaker are parallel to each other, and when viewed from a direction along the axis line of the first speaker, the first speaker and the second speaker overlap with each other.

12. A sound system comprising: The loudspeaker device according to any one of claims 1 to 11; and The phase control unit generates a first sound signal and a second sound signal which are two sound signals having a phase difference, supplies the first sound signal to the first speaker, and supplies the second sound signal to the second speaker.

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