loudspeaker

Abstract

A speaker (10) is provided with a first vibrating section (20), a second vibrating section (30), a magnetic circuit (40), and a frame (50). The magnetic circuit (40) is provided with a first magnetic gap (G1) and a second magnetic gap (G2). The first magnetic gap (G1) is open toward an upper side, and the second magnetic gap (G2) is open toward the upper side. A second elastic support section (37) is provided with an upper elastic body (38a) and a lower elastic body (38b). The second vibrating section (30) is provided with a second coupler (39) that links the second voice coil former (31) with the upper elastic body (38a) and links the second voice coil former (31) with the lower elastic body (38b).

Description

Technical Field

[0001] This disclosure relates to loudspeakers. Background Technology

[0002] The loudspeaker disclosed in Patent Document 1 has a second vibrating part in addition to a first vibrating part for emitting sound.

[0003] [Existing Technical Documents] [Patent Documents] [Patent Document 1]: International Publication No. 2023 / 090124 Summary of the Invention [The technical problem the invention aims to solve] The purpose of this disclosure is to provide a loudspeaker having a first vibrating part and a second vibrating part, and being small in size in the axial direction.

[0004] [Solutions for solving technical problems] The loudspeaker according to the first aspect comprises: a first vibrating part; a second vibrating part; a magnetic circuit; and a frame supporting the first vibrating part, the second vibrating part, and the magnetic circuit. The first vibrating part comprises: a first coil; a first voice coil frame on which the first coil is disposed; and a first elastic support portion elastically supporting the first voice coil frame to allow it to be displaced axially. The second vibrating part comprises: a second coil with a diameter larger than that of the first coil; a second voice coil frame on which the second coil is disposed; and a second elastic support portion elastically supporting the second voice coil frame to allow it to be displaced axially. The magnetic circuit comprises: a first magnetic gap on which the first coil is disposed; and a second magnetic gap on which the second coil is disposed, the first magnetic gap being open to the upper side and the second magnetic gap being open to the upper side. The second elastic support portion comprises: an upper elastic body; a lower elastic body disposed at a position lower than the upper elastic body; and a second connector connecting the second voice coil frame to the upper elastic body and connecting the second voice coil frame to the lower elastic body.

[0005] In this aspect, the loudspeaker includes a first vibrating part, a second vibrating part, a magnetic circuit, and a frame. The frame supports the first vibrating part, the second vibrating part, and the magnetic circuit. The first vibrating part includes a first coil, a first voice coil frame on which the first coil is disposed, and a first elastic support portion that elastically supports the first voice coil frame to allow it to move axially. The second vibrating part includes a second coil with a diameter larger than that of the first coil, a second voice coil frame on which the second coil is disposed, and a second elastic support portion that elastically supports the second voice coil frame to allow it to move axially. The magnetic circuit includes a first magnetic gap on which the first coil is disposed and a second magnetic gap on which the second coil is disposed. The first magnetic gap is open to the upper side, and the second magnetic gap is open to the upper side.

[0006] Furthermore, in this aspect, the second elastic support portion includes an upper elastic body and a lower elastic body.

[0007] Therefore, the second vibrating part can vibrate in a stable posture.

[0008] Furthermore, when the second elastic support has an upper elastic body and a lower elastic body, the portion of the second voice coil frame located outside the magnetic circuit needs to be made longer in the axial direction when the upper and lower elastic bodies are respectively engaged with the second voice coil frame. This results in the second vibrating part becoming larger in the axial direction, thereby causing the overall speaker to become larger.

[0009] Therefore, in this aspect, the second vibrating part also includes a second connector, which connects the second voice coil frame to the upper elastic body and the second voice coil frame to the lower elastic body.

[0010] Therefore, the upper and lower elastomers are connected to the second voice coil frame via the second connector. Thus, it is not necessary to make the portion of the second voice coil frame located outside the magnetic circuit axially longer, thereby enabling axial miniaturization of the loudspeaker.

[0011] In summary, based on this aspect, it is possible to realize a small-sized loudspeaker in the axial direction.

[0012] Furthermore, in the embodiments described later, the first vibrating part is a vibrating part for emitting sound, and the second vibrating part is a vibrating part for counteracting the vibration of the entire speaker caused by the first vibrating part. However, the first and second vibrating parts in this aspect are not limited to these types of vibrating parts. For example, both the first and second vibrating parts may be vibrating parts for emitting sound. Alternatively, the second vibrating part may be a vibrating part for emitting sound, and the first vibrating part may be a vibrating part for counteracting the vibration of the entire speaker caused by the second vibrating part.

[0013] The second aspect relates to a loudspeaker in the first aspect, wherein at least a portion of the lower elastic body is located below the upper end of the second coil.

[0014] In this aspect, at least a portion of the lower elastic body is located below the upper end of the second coil.

[0015] Therefore, the space that is radially outward relative to the magnetic circuit and lower than the upper end of the second magnetic gap can be effectively used as a space for arranging the lower elastic body.

[0016] In the embodiments described later, the lower elastic body is located entirely below the upper end of the second coil. However, this aspect is not limited to this. For example, the inner and outer joints of the lower elastic body may be located below the upper end of the second coil, and there may be portions of the lower elastic body that are not located below the upper end of the second coil.

[0017] The speaker involved in the third aspect, in the first or second aspect, has a vent hole formed on the second connector between the connection position of the upper elastomer and the connection position of the lower elastomer.

[0018] In this aspect, a vent is formed on the second connector between the connection position of the upper elastomer and the connection position of the lower elastomer.

[0019] Therefore, it can suppress the vibration of the second vibrating part caused by air resistance.

[0020] In any one of the first to third aspects, the first elastic support portion of the loudspeaker involved in the fourth aspect has a clearance portion for avoiding interference with the second voice coil frame.

[0021] In this aspect, the first elastic support portion has a clearance portion for avoiding interference with the second voice coil frame.

[0022] Therefore, the first and second vibrating parts can be brought close together axially. This makes it easy to miniaturize the loudspeaker axially.

[0023] In any one of the first to fourth aspects, the first elastic support portion of the loudspeaker involved in the fifth aspect comprises: an elastic body; and a first connector connecting the elastic body to the first voice coil frame, the first connector having a clearance portion for avoiding interference with the second voice coil frame.

[0024] In this aspect, the first elastic support portion includes an elastic body and a first connector connecting the elastic body to the first voice coil frame. Furthermore, the first connector has a clearance portion for preventing interference with the second voice coil frame.

[0025] Therefore, compared to the method of having a clearance portion in an elastomer, a clearance portion can be formed in a way that is not easily deformed.

[0026] In the sixth aspect, the loudspeaker in the fifth aspect has a first vibrating part having a diaphragm connected to the first voice coil frame without passing through the first connector.

[0027] In this aspect, the first vibrating part has a diaphragm. The diaphragm is connected to the first voice coil frame, without passing through the first connector.

[0028] Therefore, compared to the method of connecting the diaphragm to the first voice coil skeleton via the first connector, the vibration of the first voice coil skeleton can be transmitted to the diaphragm more directly.

[0029] [Invention Effects] According to this disclosure, it is possible to realize a small-sized loudspeaker in the axial direction. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the loudspeaker according to the embodiment.

[0031] Figure 2 This is an enlarged cross-sectional view of the speaker according to the embodiment.

[0032] Figure 3 This is a cross-sectional view of the magnetic circuit in the implementation method.

[0033] Figure 4 This is a cross-sectional view of the loudspeaker involved in Variation Example 1.

[0034] Figure 5 This is a cross-sectional view of the loudspeaker involved in Variation Example 2. Detailed Implementation

[0035] First, use Figures 1-3 An embodiment of the loudspeaker involved in this disclosure will be described.

[0036] Figure 1 It is a cross-sectional view of the plane passing through the central axis AX of the loudspeaker 10 involved in this embodiment.

[0037] Speaker 10 is, for example, mounted on the side door of a car.

[0038] The loudspeaker 10 has an axisymmetric structure in its main part with respect to the central axis AX.

[0039] In the following description, the direction parallel to the central axis AX is called the axial direction, one side of the axial direction is called the upper side, and the other side of the axial direction is called the lower side. In addition, the direction perpendicular to the central axis AX is called the radial direction, the side of the radial direction closer to the central axis AX is called the radial inner side, and the side of the radial direction farther from the central axis AX is called the radial outer side.

[0040] The loudspeaker 10 has a first vibrating part 20 that vibrates to produce sound, a second vibrating part 30 that vibrates to counteract the overall vibration of the loudspeaker 10 caused by the first vibrating part 20, a magnetic circuit 40, and a frame 50 that supports the first vibrating part 20, the second vibrating part 30, and the magnetic circuit 40.

[0041] (First Vibration Part 20) The first vibrating part 20 has a first voice coil frame 21, a first coil 22, a diaphragm 24, an edge part 25, a cap 26, and a first elastic support part 27.

[0042] The first voice coil frame 21 has a cylindrical shape. The first coil 22 is formed on the outer peripheral surface of the lower end of the first voice coil frame 21.

[0043] The diaphragm 24 is a component that emits sound by vibration. The diaphragm 24 has a central circular hole and a shape extending radially outward and upward from the inner edge forming the hole. The inner edge of the diaphragm 24 engages with the outer peripheral surface of the first voice coil frame 21. The outer edge of the diaphragm 24 is connected to the frame 50 via an edge portion 25. The edge portion 25 is made of rubber. The inner edge of the edge portion 25 engages with the outer edge of the diaphragm 24, and the outer edge of the edge portion 25 engages with the frame 50.

[0044] The cap 26 is a component that produces sound through vibration. The cap 26 covers the first voice coil frame 21 from above. The outer edge of the cap 26 is engaged with the upper surface of the diaphragm 24.

[0045] The first elastic support portion 27 elastically supports the first voice coil frame 21 so that it can be displaced axially. The first elastic support portion 27 is disposed on the radially outer side of the first voice coil frame 21. The first elastic support portion 27 is composed of an elastic body 27a. The elastic body 27a is an elastic body with a central circular hole and is shaped as an annular circular plate extending radially outward from the inner edge forming the circular hole. The elastic body 27a is made of fabric. The inner edge of the elastic body 27a engages with the outer peripheral surface of the first voice coil frame 21, and the outer edge of the elastic body 27a engages with the frame 50.

[0046] like Figure 2 As shown, the elastomer 27a has an inner edge portion 27a1 that engages with the outer peripheral surface of the first voice coil frame 21, a wavy portion 27a2 having a plurality of waveforms arranged radially, and an outer edge portion 27a3 that engages with the frame 50. The plurality of waveforms referred to here means a shape in which waveforms protruding upward and waveforms protruding downward alternately repeat radially.

[0047] The wavy portion 27a2 has a normal portion 27a21 and a clearance portion 27a22.

[0048] The general section 27a21 has multiple waveforms arranged radially. The upper ends of the waveforms protruding upwards in the general section 27a21 are all at almost the same height, and the lower ends of the waveforms protruding downwards in the general section 27a21 are all at almost the same height.

[0049] On the other hand, the avoidance portion 27a22 has only one upward-protruding waveform, the upper end of which is located above the upper end of the upward-protruding waveform of the ordinary portion 27a21. The upper end of the second voice coil frame 31 is located directly below the avoidance portion 27a22. Therefore, the avoidance portion 27a22 functions in a way that avoids interference with the second voice coil frame 31 when it moves upward.

[0050] (Second Vibration Part 30) The second vibrating part 30 has a second voice coil frame 31, a second coil 32, and a second elastic support part 37.

[0051] The second voice coil frame 31 has a cylindrical shape. The diameter of the second voice coil frame 31 is larger than that of the first voice coil frame 21. The second coil 32 is formed on the outer peripheral surface of the lower end of the second voice coil frame 31. Figure 1 In the non-working state shown (the state where the speaker 10 is not working), the upper end of the second voice coil frame 31 is located above the upper end of the first coil 22.

[0052] The second elastic support portion 37 elastically supports the second voice coil frame 31 so that it can be displaced axially. The second elastic support portion 37 is provided on the radially outer side of the second voice coil frame 31.

[0053] The second elastic support portion 37 includes an upper elastic body 38a, a lower elastic body 38b, and a second connector 39.

[0054] An upper elastic body 38a and a lower elastic body 38b are disposed with an axial gap. The lower elastic body 38b is positioned lower than the upper elastic body 38a. Both the upper elastic body 38a and the lower elastic body 38b are elastic bodies with a central circular hole and are shaped like annular circular plates extending radially outward from the inner edge forming the circular hole. The inner edges of the upper elastic body 38a and the lower elastic body 38b engage with a second connector 39. The second connector 39 engages with the outer peripheral surface of the second voice coil frame 31. Thus, the second connector 39 connects the second voice coil frame 31 to the upper elastic body 38a, and also connects the second voice coil frame 31 to the lower elastic body 38b.

[0055] The upper elastomer 38a is made of fabric. For example... Figure 2 As shown, the upper elastic body 38a has an inner edge portion 38a1 that engages with the second connector 39, a wavy portion 38a2 having multiple waveforms arranged radially, and an outer edge portion 38a3.

[0056] The lower elastomer 38b is made of rubber. The lower elastomer 38b has an inner edge portion 38b1 that engages with the second connector 39, a semi-circular portion 38b2 with a generally semi-circular cross-sectional shape that protrudes downward, and an outer edge portion 38b3.

[0057] The second connector 39 includes an inner edge portion 39a that engages with the second voice coil frame 31, an upper engagement portion 39c that engages with the upper elastic body 38a, a lower engagement portion 39e that engages with the lower elastic body 38b, a first connecting portion 39b that connects the inner edge portion 39a and the upper engagement portion 39c, and second connecting portions 39d1 and 39d2 that connect the upper engagement portion 39c and the lower engagement portion 39e.

[0058] The inner edge portion 39a has a shape that slopes downward toward the radially inward side. The inner edge portion 39a is joined to the second voice coil frame 31 by an adhesive (not shown). The inner edge portion 39a has a shape that slopes downward toward the radially inward side, thereby storing the adhesive on the upper side of the inner edge portion 39a.

[0059] The upper joint portion 39c has a cylindrical shape extending parallel to the axial direction. In other words, the thickness direction of the upper joint portion 39c is radial. The outer peripheral surface of the upper joint portion 39c is engaged with the upper elastomer 38a.

[0060] The lower joint 39e is located radially outward and downward relative to the upper joint 39c. The thickness direction of the lower joint 39e is axial. The upper surface of the lower joint 39e engages with the lower elastomer 38b.

[0061] The first connecting portion 39b connects the outer edge of the inner edge portion 39a to the upper end of the upper joining portion 39c in the radial direction. The thickness direction of the first connecting portion 39b is axial.

[0062] The second connecting portions 39d1 and 39d2 have a radially outward extending portion 39d1 and an inclined portion 39d2. The radially outward extending portion 39d1 extends radially outward from the lower end of the upper joining portion 39c. The inclined portion 39d2 extends from the outer edge of the radially outward extending portion 39d1 along a downward and radially outward inclined direction. The inclined portion 39d2 is connected to the inner edge of the lower joining portion 39e.

[0063] Although the illustration is omitted, a through hole is formed on the second connector 39, extending through the second connector 39 in the thickness direction. This through hole is formed, for example, in the first connecting portion 39b or the second connecting portions 39d1, 39d2 (inclined portion 39d2).

[0064] The outer edge of the second elastic support portion 37 is joined to the frame 50.

[0065] Specifically, the outer edge 38a3 of the upper elastomer 38a is engaged with the frame 50, and the outer edge 38b3 of the lower elastomer 38b is engaged with the frame 50.

[0066] The second connector 39 is, for example, a resin molded part, which is less prone to deformation compared to the upper elastomer 38a and the lower elastomer 38b. Even when the second voice coil frame 31 is displaced axially, the relative positional relationship of the second voice coil frame 31, the second coil 32, and the second connector 39 remains essentially unchanged.

[0067] Regardless of whether the second voice coil frame 31 is in its initial position (refer to...) Figure 2 Whether in the state of displacement of the second voice coil frame 31 (not shown), the upper engagement portion 39c of the second connector 39 is located above the upper end of the second coil 32. Therefore, in either state, the inner edge portion 38a1 of the upper elastic body 38a is located above the upper end of the second coil 32.

[0068] Whether the second voice coil frame 31 is in its initial position or in a displaced state, the lower engagement portion 39e of the second connector 39 is located below the upper end of the second coil 32. Therefore, in either state, the inner edge 38b1 of the lower elastic body 38b is located below the upper end of the second coil 32.

[0069] (Magnetic circuit 40) like Figure 3 As shown, the magnetic circuit 40 includes a first magnetic component 41, a first magnet 42, a second magnetic component 43, a second magnet 44, and a third magnetic component 45. These magnetic components 41, 43, and 45 are joined to the magnets 42 and 44 by adhesives or the like.

[0070] The magnetic circuit 40 has a first magnetic gap G1 and a second magnetic gap G2. Both the first magnetic gap G1 and the second magnetic gap G2 are open to the upward side. The second magnetic gap G2 is located radially outward from the first magnetic gap G1.

[0071] The magnetic circuit 40 is formed integrally. That is to say, the magnetic circuit 40, which has a first magnetic gap G1 and a second magnetic gap G2, is formed integrally.

[0072] Magnetic circuit 40 forms a first magnetic path 71 and a second magnetic path 72. The first magnetic path 71 is a magnetic path that passes through both the first magnetic gap G1 and the second magnetic gap G2. The second magnetic path 72 is a magnetic path that passes only through the second magnetic gap G2 of the first magnetic gap G1 and the second magnetic gap G2.

[0073] The portion between the outer forming surface G1b of the first magnetic gap G1 and the inner forming surface G2a of the second magnetic gap G2 in the first magnetic path 71 is formed by the second magnetic component 43.

[0074] The portion between the outer forming surface G2b of the second magnetic gap G2 and the inner forming surface G1a of the first magnetic gap G1 in the first magnetic path 71 is formed by the third magnetic component 45, the first magnet 42, and the first magnetic component 41. Hereinafter, the third magnetic component 45, the first magnet 42, and the first magnetic component 41 are sometimes collectively referred to as the detour magnetic path forming portions 41, 42, and 45.

[0075] Furthermore, the inner forming surface of the magnetic gap refers to the surface located radially inside the magnetic gap, and the outer forming surface of the magnetic gap refers to the surface located radially outside the magnetic gap.

[0076] The portion of the second magnetic path 72 that does not overlap with the first magnetic path 71 is formed by the second magnet 44. The second magnetic path 72 is formed by connecting the second magnetic component 43 with the detour magnetic path forming portions 41, 42, and 45 via the second magnet 44. This second magnetic path 72 passes through the second magnetic gap G2 but does not pass through the first magnetic gap G1. The second magnetic component 43 and the detour magnetic path forming portions 41, 42, and 45 are connected only by the second magnet 44.

[0077] The third magnetic component 45 has a bottom wall portion 45a, a cylindrical wall portion 45b that is erected upward from the outer edge of the bottom wall portion 45a, a protrusion 45c that protrudes upward from the center of the bottom wall portion 45a, and a mounting portion 45d that is mounted on the frame 50. The mounting portion 45d protrudes radially outward from the outer peripheral surface of the cylindrical wall portion 45b. The mounting portion 45d is located near the lower end of the cylindrical wall portion 45b.

[0078] The first magnet 42 is disposed on the upper surface of the protrusion 45c of the third magnetic component 45. The first magnet 42 is cylindrical in shape. The first magnet 42 mainly applies magnetic flux to the first magnetic path 71.

[0079] The second magnet 44 is disposed on the upper surface of the bottom wall portion 45a of the third magnetic component 45. The second magnet 44 is a ring-shaped magnet. As a ring-shaped magnet, the second magnet 44 is disposed in such a way that it surrounds the protrusion 45c of the third magnetic component 45. That is, the protrusion 45c of the third magnetic component 45 is disposed radially inside the second magnet 44. The second magnet 44 mainly applies magnetic flux to the second magnetic path 72.

[0080] A second magnetic component 43 is disposed on the upper surface of a second magnet 44. The second magnetic component 43 has a cylindrical portion 43a and an outer protrusion 43b. The cylindrical portion 43a has a cylindrical shape, and the outer protrusion 43b protrudes radially outward from the lower end of the cylindrical portion 43a. The inner circumferential surface of the cylindrical portion 43a has an outer forming surface G1b for a first magnetic gap G1. The radially outer surface of the outer protrusion 43b has an inner forming surface G2a for a second magnetic gap G2. The inner diameter of the cylindrical portion 43a is smaller than the inner diameter of the second magnet 44. The outer diameter of the cylindrical portion 43a is smaller than the outer diameter of the second magnet 44.

[0081] A first magnetic component 41 is disposed on the upper surface of a first magnet 42. The first magnetic component 41 is generally cylindrical in shape. The outer peripheral surface of the first magnetic component 41 has an inner forming surface G1a for a first magnetic gap G1.

[0082] Specifically, the first magnetic component 41 has a generally cylindrical main body 41a and a cover 41b covering the main body 41a. The cover 41b covers a portion of the upper surface and the outer peripheral surface of the main body 41a. The cover 41b serves as the inner forming surface G1a of the first magnetic gap G1. The cover 41b is made of a non-magnetic component (for example, copper). The cover 41b suppresses the generation of eddy currents in the first magnetic gap G1.

[0083] (Frame 50) like Figure 1 As shown, the frame 50 has a first bottom wall portion 51, a second bottom wall portion 52, a third bottom wall portion 53, a fourth bottom wall portion 54, and a magnetic circuit support portion 55.

[0084] The first bottom wall portion 51 is located above the second bottom wall portion 52. The second bottom wall portion 52 is located above the third bottom wall portion 53. The third bottom wall portion 53 is located above the fourth bottom wall portion 54. The fourth bottom wall portion 54 is located above the magnetic circuit support portion 55.

[0085] The first bottom wall portion 51 supports the outer edge of the edge portion 25. The second bottom wall portion 52 supports the outer edge of the elastic body 27a of the first elastic support portion 27. The third bottom wall portion 53 supports the outer edge of the upper elastic body 38a of the second elastic support portion 37. The fourth bottom wall portion 54 supports the outer edge of the lower elastic body 38b of the second elastic support portion 37. The magnetic circuit support portion 55 supports the magnetic circuit 40.

[0086] The first bottom wall portion 51, the second bottom wall portion 52, the third bottom wall portion 53, and the fourth bottom wall portion 54 support each supported object (edge ​​portion 25, etc.) on their respective upper surfaces. The magnetic circuit support portion 55 is mechanically fixed relative to the magnetic circuit 40.

[0087] The outer edge of the edge portion 25 is located radially outward from the outer edge of the elastic body 27a of the first elastic support portion 27.

[0088] The outer edge of the upper elastic body 38a of the second elastic support portion 37 is located radially outward compared to the outer edge of the lower elastic body 38b of the second elastic support portion 37. The outer edge of the lower elastic body 38b of the second elastic support portion 37 is located radially outward compared to the mounted portion 45d of the magnetic circuit 40.

[0089] The outer edge of the elastic body 27a of the first elastic support portion 27 is located radially inward than the outer edge of the upper elastic body 38a of the second elastic support portion 37, and is also located radially inward than the outer edge of the lower elastic body 38b of the second elastic support portion 37. In other words, the outer edge of the first elastic support portion 27 is located radially inward than the outer edge of the second elastic support portion 37.

[0090] The frame 50 has a first connecting part 56, a second connecting part 57, a third connecting part 58 and a fourth connecting part 59.

[0091] The first connecting part 56 connects the first bottom wall part 51 and the second bottom wall part 52. The second connecting part 57 connects the second bottom wall part 52 and the third bottom wall part 53. The third connecting part 58 connects the third bottom wall part 53 and the fourth bottom wall part 54. The fourth connecting part 59 connects the fourth bottom wall part 54 and the magnetic circuit support part 55.

[0092] The first connecting portion 56 has a first longitudinal wall 56a extending parallel to the axial direction and a first inclined wall 56b inclined relative to the axial direction. The second connecting portion 57 has a second longitudinal wall 57a extending parallel to the axial direction. The third connecting portion 58 has a third inclined wall 58a inclined relative to the axial direction. The fourth connecting portion 59 has a fourth inclined wall 59a inclined relative to the axial direction and a fourth bottom wall 59b perpendicular to the axial direction. The lower surface of the fourth bottom wall 59b is flush with the lower surface of the magnetic circuit support portion 55.

[0093] The first connecting portion 56 extends from the inner edge of the first bottom wall portion 51. The third connecting portion 58 extends from the inner edge of the third bottom wall portion 53. The fourth connecting portion 59 extends from the inner edge of the fourth bottom wall portion 54.

[0094] On the other hand, the second connecting portion 57 extends from the outer edge of the second bottom wall portion 52.

[0095] The lower surface of the magnetic circuit support portion 55 is flush with the lower surface of the third magnetic component 45 of the magnetic circuit 40. Thus, the lower surface of the frame 50 is flush with the lower surface of the magnetic circuit 40.

[0096] The frame 50 comprises a first frame 50A and a second frame 50B. The first frame 50A and the second frame 50B are separately molded (resin molded).

[0097] The first frame 50A has a first bottom wall portion 51, a first connecting portion 56, a second bottom wall portion 52, and a second connecting portion 57. The second frame 50B has a third bottom wall portion 53, a third connecting portion 58, a fourth bottom wall portion 54, a fourth connecting portion 59, and a magnetic circuit support portion 55.

[0098] In addition, the second frame 50B has an outer longitudinal wall 51B1, which is disposed radially outside the second longitudinal wall 57a of the second connecting portion 57 of the first frame 50A.

[0099] Next, the relationship between the magnetic circuit 40, the first vibration unit 20, and the second vibration unit 30 will be explained.

[0100] like Figure 1 As shown, a first coil 22 of a first vibrating section 20 is disposed in the first magnetic gap G1. The first coil 22 is connected to the transmission path. Under the action of an electrical signal from the transmission path and the magnetic field of the first magnetic gap G1, the first voice coil frame 21 vibrates together with the first coil 22, resulting in the vibration of the first vibrating section 20, including the diaphragm 24, etc. Sound is emitted. At this time, an excitation force is generated in the loudspeaker 10 according to the vibration of the first vibrating section 20. This excitation force is transmitted through the frame 50, causing the loudspeaker 10 as a whole and the mounting object on which the loudspeaker 10 is mounted (e.g., the panel of a car side door) to vibrate.

[0101] A second coil 32 of a second vibrating section 30 is disposed in the second magnetic gap G2. The second coil 32 is connected to the transmission path. Under the action of the electrical signal from the transmission path and the magnetic field of the second magnetic gap G2, the second voice coil frame 31 vibrates together with the second coil 32, resulting in the vibration of the second vibrating section 30. The first vibrating section 20 and the second vibrating section 30 are configured to operate in opposite phases. Therefore, the excitation force generated by the vibration of the first vibrating section 20 can be canceled, and the overall vibration of the loudspeaker 10 can be suppressed.

[0102] <Effects> Next, the effects of this implementation method will be explained.

[0103] In this embodiment, such as Figure 1As shown, the loudspeaker 10 includes a first vibrating part 20, a second vibrating part 30, a magnetic circuit 40, and a frame 50. The frame 50 supports the first vibrating part 20, the second vibrating part 30, and the magnetic circuit 40. The first vibrating part 20 includes a first coil 22, a first voice coil frame 21 on which the first coil 22 is disposed, and a first elastic support part 27 that elastically supports the first voice coil frame 21 so that it can be displaced axially. The second vibrating part 30 includes a second coil 32 with a diameter larger than the first coil 22, a second voice coil frame 31 on which the second coil 32 is disposed, and a second elastic support part 37 that elastically supports the second voice coil frame 31 so that it can be displaced axially. The magnetic circuit 40 includes a first magnetic gap G1 on which the first coil 22 is disposed and a second magnetic gap G2 on which the second coil 32 is disposed. The first magnetic gap G1 is open to the upper side, and the second magnetic gap G2 is open to the upper side.

[0104] In addition, in this embodiment, such as Figure 1 As shown, the second elastic support portion 37 includes an upper elastic body 38a and a lower elastic body 38b.

[0105] Therefore, the second vibrating part 30 can vibrate in a stable posture.

[0106] Furthermore, when the second elastic support portion 37 has an upper elastic body 38a and a lower elastic body 38b, when the upper elastic body 38a and the lower elastic body 38b are respectively engaged with the second voice coil frame 31, the portion of the second voice coil frame 31 disposed outside the magnetic circuit 40 needs to be formed longer in the axial direction. This results in the second vibrating portion 30 becoming larger in the axial direction, thereby resulting in the overall size of the loudspeaker 10 becoming larger.

[0107] Therefore, in this embodiment, as Figure 1 As shown, the second vibrating part 30 also includes a second connector 39, which connects the second voice coil frame 31 to the upper elastic body 38a, and connects the second voice coil frame 31 to the lower elastic body 38b.

[0108] Therefore, the upper elastic body 38a and the lower elastic body 38b are connected to the second voice coil frame 31 via the second connector 39. Therefore, it is not necessary to make the portion of the second voice coil frame 31 located outside the magnetic circuit 40 longer in the axial direction, thereby enabling the speaker 10 to be miniaturized in the axial direction.

[0109] In addition, in this embodiment, such as Figure 2 As shown, the lower elastic body 38b is located below the upper end of the second coil 32.

[0110] Therefore, the space that is radially outward relative to the magnetic circuit 40 and lower than the upper end of the second magnetic gap G2 can be effectively used as a space in which the lower elastic body 38b is disposed.

[0111] Alternatively, in this embodiment, a vent hole may be formed on the second connector 39 between the connection position of the upper elastic body 38a (upper joint 39c) and the connection position of the lower elastic body 38b (lower joint 39e).

[0112] At this time, the vibration of the second vibrating part 30 can be suppressed due to the influence of air resistance.

[0113] In addition, in this embodiment, such as Figure 2 As shown, the first elastic support portion 27 has a clearance portion 27a22, which is used to avoid interference with the second voice coil frame 31.

[0114] Therefore, the first vibrating part 20 and the second vibrating part 30 can be brought closer together in the axial direction. Therefore, the speaker 10 can be miniaturized in the axial direction.

[0115] In addition, in this embodiment, such as Figure 3 As shown, the magnetic circuit 40 forms a first magnetic path 71 and a second magnetic path 72. The first magnetic path 71 is a magnetic path that passes through both the first magnetic gap G1 and the second magnetic gap G2. The second magnetic path 72 is a magnetic path that passes only through the second magnetic gap G2 of the first magnetic gap G1 and the second magnetic gap G2. The magnetic circuit 40 includes a second magnetic component 43 and detour magnetic path forming portions 41, 42, and 45. The second magnetic component 43 forms the portion between the outer forming surface G1b of the first magnetic gap G1 and the inner forming surface G2a of the second magnetic gap G2 in the first magnetic path 71. The detour magnetic path forming portions 41, 42, and 45 form the portion between the outer forming surface G2b of the second magnetic gap G2 and the inner forming surface G1a of the first magnetic gap G1 in the first magnetic path 71. Furthermore, the detour magnetic path forming portions 41, 42, and 45 have a first magnet 42, which mainly applies magnetic flux to the first magnetic path 71.

[0116] Therefore, the magnetic flux density of the first magnetic gap G1 and the second magnetic gap G2 can be ensured by the first magnet 42.

[0117] In addition, in this embodiment, the magnetic circuit 40 includes a second magnet 44. The second magnet 44 mainly applies magnetic flux to the second magnetic path 72.

[0118] Therefore, the magnetic flux density of the second magnetic gap G2 can be ensured by the second magnet 44.

[0119] In addition, in this embodiment, the second magnetic component 43 is connected to the detour magnetic path forming portions 41, 42, and 45 only through the second magnet 44.

[0120] Therefore, it is not easy to form a magnetic path (third magnetic path) that only passes through the first magnetic gap G1 in the first magnetic gap G1 and the second magnetic gap G2. As a result, it is easy to ensure the magnetic flux density of the second magnetic gap G2.

[0121] In addition, in this embodiment, such as Figure 1 As shown, the first vibration part 20 is a drive part for emitting sound, and the second vibration part 30 is a drive part for counteracting the overall vibration of the speaker 10 caused by the first vibration part 20.

[0122] Therefore, it is able to suppress the overall vibration of the speaker 10.

[0123] (Variation example) Furthermore, in the above embodiment, the clearance portion 27a22 of the first elastic support portion 27 is provided on the elastic body 27a. However, the clearance portion of this disclosure is not limited to this. Modified examples will be described below.

[0124] Figure 4 The speaker 110 in Modified Example 1 is indicated. Furthermore, reference numerals are used for components having the same or similar functions as those in the speaker 10 described in the above embodiment.

[0125] In Modification 1, the first elastic support portion 27 includes an elastic body 27a and a first connector 29 connecting the elastic body 27a and the first voice coil frame 21. Furthermore, the first connector 29 has a clearance portion 29a, which is used to avoid interference with the second voice coil frame 31.

[0126] Therefore, compared to the method in which the elastomer 27a has a relief portion 27a22, the relief portion 29a can be formed in a way that is not easily deformed.

[0127] In addition, in Modified Example 1, the clearance portion 27a22 is configured to be able to enter at least a portion of the second connector 39.

[0128] Therefore, the first vibrating part 20 and the second vibrating part 30 can be brought closer together in the axial direction. This makes it easier to miniaturize the loudspeaker 10 in the axial direction.

[0129] In addition, in Modification 1, the first vibrating part 20 includes a diaphragm 24. The diaphragm 24 is connected to the first voice coil frame 21 without passing through the first connector 29.

[0130] Therefore, compared to the method of connecting the diaphragm 24 to the first voice coil frame 21 via the first connector 29, the vibration of the first voice coil frame 21 can be transmitted to the diaphragm 24 more directly. In other words, the sound signal can be transmitted to the diaphragm 24 with less loss.

[0131] Figure 5The speaker 210 in Modified Example 2 is indicated. Furthermore, the same reference numerals are used for components having the same or similar functions as the speaker 10 in the embodiment.

[0132] In Modification 2, the second elastic support portion 37 is the same as the speaker 10 described in the above embodiment, and includes an upper elastic body 38a and a lower elastic body 38b.

[0133] Therefore, the second vibrating part 30 can vibrate in a stable posture.

[0134] In addition, in Modification 2, the second vibrating part 30 also includes a second connector 39, which connects the second voice coil frame 31 to the upper elastic body 38a, and connects the second voice coil frame 31 to the lower elastic body 38b.

[0135] Therefore, the upper elastic body 38a and the lower elastic body 38b are connected to the second voice coil frame 31 via the second connector 39. Therefore, it is not necessary to make the portion of the second voice coil frame 31 located outside the magnetic circuit 40 longer in the axial direction, thereby enabling the speaker 210 to be miniaturized in the axial direction.

[0136] In addition, in Modification 2, a vent hole 39H is formed on the second connector 39 between the connection position of the upper elastic body 38a (upper joint 39c) and the connection position of the lower elastic body 38b (lower joint 39e).

[0137] Therefore, it is possible to suppress the vibration of the second vibrating part 30 caused by air resistance.

[0138] Furthermore, in Modification 2, the magnetic circuit 40 includes a first magnetic circuit 40A and a second magnetic circuit 40B. The first magnetic circuit 40A has a first magnetic gap G1 in which a first coil 22 is disposed, and the second magnetic circuit 40B has a second magnetic gap G2 in which a second coil 32 is disposed. Additionally, the frame 50 includes a first frame 50A and a second frame 50B. The first frame 50A is equipped with a first vibrating part 20 and the first magnetic circuit 40A, and the second frame 50B is equipped with a second vibrating part 30 and the second magnetic circuit 40B.

[0139] Therefore, the loudspeaker 210 can be manufactured by combining the components including the first vibrating part 20, the first magnetic circuit 40A, and the first frame 50A, and the components including the second vibrating part 30, the second magnetic circuit 40B, and the second frame 50B, after assembling them separately. In other words, the loudspeaker 210 is designed to take into account the manufacturing process.

[0140] [Supplementary Explanation] The preferred embodiments of this disclosure have been described above, but this disclosure is not limited to the above embodiments. Supplementary explanations follow.

[0141] In the above embodiment, the magnetic circuit 40 has Figure 3 The structure shown is not limited to this. However, the magnetic circuit of this disclosure is not limited to this.

[0142] In the above embodiment, the upper elastic body 38a is made of cloth, and the lower elastic body 38b is made of rubber. However, this disclosure is not limited to this. Alternatively, the upper elastic body 38a may be made of rubber, and the lower elastic body 38b may be made of cloth. For example, if one of the upper elastic body 38a and the lower elastic body 38b in the second elastic support portion 37 is made of rubber, it can suppress fatigue relaxation of the second elastic support portion as a whole compared to a configuration where both the upper and lower elastic bodies are made of cloth. Furthermore, if one of the upper elastic body 38a and the lower elastic body 38b in the second elastic support portion 37 is made of cloth, it can improve the centering force of the second elastic support portion relative to the second voice coil frame 31 compared to a configuration where both the upper and lower elastic bodies are made of rubber.

[0143] In addition, the first voice coil frame 21 is elastically supported not only by the first elastic support portion 27, but also by the edge portion 25. The first elastic support portion 27 includes an elastic body 27a made of cloth, and the edge portion 25 is made of rubber.

[0144] In this structure, one of the upper elastic body 38a and the lower elastic body 38b of the second elastic support 37 is made of rubber, thereby allowing adjustment of characteristic changes caused by the passage of time between the component that elastically supports the first voice coil frame 21 and the component that elastically supports the second voice coil frame 31.

[0145] As a result, the performance of the second vibration unit 30 (i.e., the function of counteracting the overall vibration of the speaker 210 caused by the first vibration unit 20) is reduced.

[0146] Furthermore, this disclosure is not limited to the above description; the upper elastomer 38a and the lower elastomer 38b may both be made of cloth or both of rubber.

[0147] [Explanation of Labels in the Attached Image] 10: Loudspeaker; 20: First vibrating part; 21: First voice coil frame; 22: First coil; 24: Diaphragm; 27: First elastic support part; 27a: Elastomer; 27a22: Clearance part; 29: First connector; 30: Second vibrating part; 31: Second voice coil frame; 32: Second coil; 37: Second elastic support part; 38a: Upper elastic body; 38b: Lower elastic body; 39: Second connector; 40: Magnetic circuit; 41: First magnetic component; 42: First magnet; 43: Second magnetic component; 44: Second magnet; 45: Third magnetic component; 50: Frame; 110: Loudspeaker; 29a: Clearance part; G1: First magnetic gap; G1a: Inner forming surface; G1b: Outer forming surface; G2: Second magnetic gap; G2a: Inner forming surface; G2b: Outer forming surface.

Claims

1. A loudspeaker, comprising: First vibrating part; Second vibrating part; Magnetic circuit; and The frame supports the first vibrating part, the second vibrating part, and the magnetic circuit. The first vibrating part includes: First coil; A first voice coil frame, on which the first coil is disposed; and The first elastic support portion elastically supports the first voice coil frame so that it can be displaced axially. The second vibrating part includes: The second coil has a larger diameter than the first coil; The second voice coil frame, which houses the second coil; and The second elastic support portion elastically supports the second voice coil frame so that it can be displaced axially. The magnetic circuit includes: A first magnetic gap, wherein the first coil is disposed; and The second magnetic gap, which is equipped with the second coil, The first magnetic gap opens upwards. The second magnetic gap opens upwards. The second elastic support portion includes: Upper elastomer; The lower elastic body is disposed at a position lower than the upper elastic body; and The second connector connects the second voice coil frame to the upper elastic body and the second voice coil frame to the lower elastic body.

2. The loudspeaker according to claim 1, wherein, At least a portion of the lower elastic body is located below the upper end of the second coil.

3. The loudspeaker according to claim 1, wherein, On the second connector, a vent hole is formed between the connection position of the upper elastomer and the connection position of the lower elastomer.

4. The loudspeaker according to claim 1, wherein, The first elastic support portion has a clearance portion, which is used to avoid interference with the second voice coil frame.

5. The loudspeaker according to claim 1, wherein, The first elastic support portion includes: Elastomers; and A first connector connects the elastomer to the first voice coil frame. The first connector has a clearance portion for avoiding interference with the second voice coil frame.

6. The loudspeaker according to claim 5, wherein, The first vibrating part has a diaphragm. The diaphragm is connected to the first voice coil frame without passing through the first connector.

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