Acoustic transducer for speaker

Abstract

To obtain an acoustic transducer for a speaker, which enables a vibration part to be sufficiently press-fitted to a vibration object constituted as a separate body.SOLUTION: An acoustic transducer for a speaker includes: a magnetic circuit part to be fixed to a vibration object via a frame part; a vibration part to be vibrated with respect to the magnetic circuit part; a main body part mounted on the vibration part and having a joint surface to be joined with the vibration object; and flange parts projected from an outer peripheral surface of the main body part. The transducer also includes a pressing part for pressing the flange parts so as to allow the joint surface to be pressed against the vibration object.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to an acoustic transducer for a speaker. [Background technology]

[0002] The panel speaker described in Patent Document 1 uses a guide sign placed in an appropriate location in a model house or model room as the vibration target, and is configured to function as a panel speaker by attaching a separately constructed drive unit to the vibration target.

[0003] The vehicle-mounted acoustic transducer described in Patent Document 2 is equipped with a cushioning member attached to the bobbin of a voice coil, and is configured to drive a glass plate such as the rear window of an automobile by pressing a part of the cushioning member against the glass plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-016993 A [Patent Document 2] Publication No. 2544995 Summary of the Invention [Problem to be solved by the invention]

[0005] When the vibration target and the acoustic transducer are constructed as separate bodies as in Patent Documents 1 and 2 above, it is desirable to provide a means for sufficiently pressing the vibration part of the acoustic transducer that transmits vibrations against the vibration target, but Patent Documents 1 and 2 above do not take this point into consideration.

[0006] The present disclosure has been made in consideration of the above circumstances, and has an object to provide an acoustic transducer for a speaker that can sufficiently press a vibrating portion against a vibration target that is configured separately. [Means for solving the problem]

[0007] The acoustic transducer for a speaker according to the first aspect of the present disclosure comprises a magnetic circuit portion fixed to a vibration object via a frame portion, a vibration portion vibrating relative to the magnetic circuit portion, a main body portion attached to the vibration portion and having a joint surface to be joined to the vibration object, and a pressing portion having a flange portion protruding from an outer peripheral surface of the main body portion and capable of pressing the joint surface against the vibration object by pressing the flange portion.

[0008] In the acoustic transducer for speaker according to the first aspect of the present disclosure, by pressing the flange portion of the pressing part, the joint surface of the main body part can be pressed against the vibration target, so that the vibration part can be sufficiently pressed against the vibration target which is formed separately.

[0009] The acoustic transducer for a speaker according to a second aspect of the present disclosure has the configuration according to the first aspect, wherein the flange portion is exposed to the outside of the frame portion when viewed from a pressing direction of the flange portion.

[0010] In the acoustic transducer for speaker according to the second aspect of the present disclosure, by pressing the portion exposed on the outside of the frame portion when viewed from the pressing direction, the joint surface of the main body portion can be pressed against the vibration target, so that the vibration portion can be easily and sufficiently pressed against the vibration target which is formed separately.

[0011] A speaker acoustic transducer according to a third aspect of the present disclosure has the configuration according to the first aspect, wherein the joint surface protrudes toward the vibration target with respect to the flange portion.

[0012] In the acoustic transducer for speaker according to the third aspect of the present disclosure, when the flange portion is pressed, the joint surface can be pressed against the vibration target before the flange portion.

[0013] The acoustic transducer for a speaker according to a fourth aspect of the present disclosure has the configuration according to the first aspect, wherein the plate thickness of the joint surface is greater than the plate thickness of the flange portion.

[0014] In the acoustic transducer for speaker according to the fourth aspect of the present disclosure, the main body is less likely to deform when the flange is pressed, so that deformation of the vibrating part fixed to the main body can be suppressed.

[0015] An acoustic transducer for a speaker according to a fifth aspect of the present disclosure has the configuration described in the first aspect, wherein the frame portion has a holding portion that holds the magnetic circuit portion, and an opening that communicates with the space between the holding portion and the flange portion and allows a jig to be inserted from the side of the frame portion.

[0016] In the acoustic transducer for speaker according to the fifth aspect of the present disclosure, a jig can be inserted from the opening of the frame portion, and the flange portion can be pressed using the jig.

[0017] A sixth aspect of the present disclosure relates to an acoustic transducer for a speaker, and in the configuration described in the fifth aspect, the frame portion further has a pair of extension portions extending from the holding portion and fixed to the vibration target, and the opening is formed on the inside by connecting the pair of extension portions to the holding portion.

[0018] In the acoustic transducer for speaker according to the sixth aspect of the present disclosure, an opening is formed on the side of the frame part due to the configuration of the frame part that connects the pair of extending parts and the holding part, which makes it possible to insert a jig from the side of the frame part with a simple structure, and facilitates manufacturing.

[0019] An acoustic transducer for a speaker according to a seventh aspect of the present disclosure, in the configuration described in the first aspect, has an elastic pressing portion arranged on the side of the main body portion, and the elastic pressing portion is arranged in a position overlapping with the flange portion by elastically deforming toward the main body portion, and is configured to be able to press the flange portion via the elastic pressing portion.

[0020] In the acoustic transducer for speaker according to the seventh aspect of the present disclosure, the elastic pressing portion is pressed and disposed at a position where the elastic pressing portion overlaps with the flange portion, so that the joint surface of the main body portion can be pressed against the vibration target from the outside of the frame portion. Therefore, the vibration portion can be easily and sufficiently pressure-bonded to the vibration target that is configured separately.

[0021] An acoustic transducer for a speaker according to an eighth aspect of the present disclosure has the configuration according to the seventh aspect, wherein the elastic pressing portion is disposed radially outward from the vibration portion.

[0022] In the acoustic transducer for speaker according to the eighth aspect of the present disclosure, the elastic pressing portion can be provided at a position that does not interfere with the vibration of the vibrating portion even after the acoustic transducer is attached. Effect of the Invention

[0023] As described above, according to the acoustic transducer for speaker according to the present disclosure, the vibrating portion can be sufficiently pressed against the vibration target constituted separately. [Brief description of the drawings]

[0024] [Figure 1] 1 shows a vehicle equipped with an acoustic transducer for a speaker according to a first embodiment. [Diagram 2] 2 is a longitudinal sectional view of the acoustic transducer for a speaker according to the first embodiment, taken along line II-II in FIG. [Diagram 3] FIG. 1 is a side view of an acoustic transducer for a speaker according to a first embodiment. [Figure 4] 4 shows the acoustic transducer for a speaker according to the first embodiment as viewed in the direction of arrow A in FIG. 3. [Diagram 5] 4 shows the speaker acoustic transducer according to the first embodiment as viewed in the direction of arrow B in FIG. 3. [Figure 6] 4 shows the speaker acoustic transducer according to the first embodiment as viewed in the direction of arrow C in FIG. 3. [Figure 7]7 is a vertical cross-sectional view of the pressing portion according to the first embodiment, taken along line VII-VII in FIG. 3; FIG. [Figure 8] FIG. 2A is a side view showing a part of a support member according to the first embodiment in an enlarged manner, and FIG. 2B is a plan view showing a part of the support member in an enlarged manner. [Figure 9] 4 is an enlarged side view showing a state in which the support member is attached to the vibration target. FIG. [Figure 10] (A) shows the acoustic transducer for a speaker according to the second embodiment as viewed from the direction of arrow A in FIG. 3, and (B) shows the acoustic transducer for a speaker according to the second embodiment as viewed from the direction of arrow C in FIG. 3. [Figure 11] 4(A) shows the state of the acoustic transducer for a speaker according to the third embodiment as viewed from the direction of arrow C in FIG. 3, and (B) is a side view of the acoustic transducer for a speaker according to the third embodiment in FIG. 3. [Figure 12] FIG. 4 shows the acoustic transducer for speaker according to the fourth embodiment as viewed from the direction of arrow A in FIG. 3, where (A) shows the state before deformation of the elastic pressing portion, and (B) shows the state after deformation of the elastic pressing portion. [Figure 13] 13(A) to 13(C) are diagrams illustrating modified examples of the support member. [Figure 14] 13 is a diagram illustrating a modified example of the support member. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] Hereinafter, with reference to the drawings, a description will be given of several embodiments and modifications of the acoustic transducer for speaker (hereinafter, also simply referred to as "acoustic transducer") of the present disclosure. The acoustic transducer of the present disclosure can reproduce sounds in the human audible frequency range by attaching it to a separately configured plate-shaped vibration target and vibrating the vibration target. In each of the embodiments and modifications described below, as an example, the vibration target is a plate-shaped glass.

[0026] Generally, plate-shaped glass has a high inelasticity, but its specific gravity is heavy compared to paper, etc. Therefore, if the frame of the acoustic transducer has a structure with a high inelasticity like glass, the vibrations generated between the vibration part and the magnetic circuit part of the acoustic transducer are suppressed, and the reproducible frequency band is increased.

[0027] In contrast, the acoustic transducer according to the present disclosure has a structure that improves the elasticity of the frame of the acoustic transducer. This allows, for example, in a structure that uses a plate-shaped glass as a vibration target, to adjust the frequency band as desired and vibrate the vibration target. For example, the configuration according to the present disclosure allows the vibration target to be vibrated in a frequency band of 800 [Hz] to 20 [kHz].

[0028] First Embodiment An acoustic transducer 10A according to a first embodiment will be described with reference to Figs. 1 to 9. As shown in Fig. 1, the acoustic transducer 10A can be attached to, for example, a glass roof 14 of a vehicle 12. The glass roof 14, which is a vibration target, is made of plate-shaped glass and constitutes a part of the ceiling of the vehicle 12. The acoustic transducer 10A is attached to the glass roof 14 from the interior side of the vehicle 12. The glass roof 14 is gently curved so as to form a convex shape toward the outside of the vehicle 12, and forms a concave curved surface with respect to the acoustic transducer 10A arranged on the interior side of the vehicle 12.

[0029] 2 is a cross-sectional view of the acoustic transducer 10A attached to the glass roof 14. As shown in this figure, the acoustic transducer 10A has a magnetic circuit section 20 and a vibration section 30 as a drive unit that transmits vibrations to the glass roof 14. The magnetic circuit section 20 is attached to the glass roof 14 via an elastically deformable frame section 50. The vibration section 30 is attached to the glass roof 14 via a support member 60A supported by the frame section 50.

[0030] (Magnetic circuit section) The magnetic circuit section 20 has a pot-shaped yoke 21 having a bottomed cylindrical shape, and a magnet 22 and a pole piece 23 housed inside the yoke 21. The magnet 22 is attached to the bottom surface of the yoke 21. The pole piece 23 is attached to the magnet 22. The yoke 21 and the pole piece 23 are arranged with the magnet 22 sandwiched between them, thereby generating a magnetic gap between the yoke 21 and the pole piece 23.

[0031] (Vibration part) The vibrating section 30 has a voice coil 31 made of a conductive wire, and a cylindrical bobbin 32 around which the voice coil 31 is wound. The voice coil 31 is formed into a cylindrical shape by being wound in a spiral shape.

[0032] The voice coil 31 is disposed in a position in which the vibration direction of the acoustic transducer 10A is the axial direction, and one end in the axial direction is inserted into the magnetic gap formed by the magnetic circuit section 20. Both ends of the voice coil 31 are connected to external wiring that supplies a drive current via lead wires (not shown). As a result, when a drive current is supplied to the voice coil 31, the magnetic circuit section 20 and the vibration section 30 vibrate.

[0033] The voice coil 31 is fixed to one axial end of the bobbin 32, and the other axial end protrudes from the voice coil 31. A pressing portion 40 is attached to the other end protruding from the voice coil 31.

[0034] (Pressing part) The pressing part 40 has a main body part 41 attached to the vibration part 30 and a flange part 42 protruding from the outer circumferential surface of the main body part 41. The pressing part 40 is made of, for example, a resin molded product, and the main body part 41 and the flange part 42 are integrally formed.

[0035] The main body 41 is formed in a cylindrical shape with a bottom that opens toward the vibrating part 30. The other axial end of the bobbin 32 protruding from the voice coil 31 is fixed inside the main body 41. Note that the bobbin 32 may be omitted, and the other axial end of the voice coil 31 may be directly fixed to the main body 41.

[0036] The surface of the main body 41 that faces the glass roof 14 is a joint surface S1. A part of a support member 60A, which will be described later, is fixed to the joint surface S1. The pressing unit 40 has the joint surface S1 of the main body 41 joined to the glass roof 14 via the support member 60A.

[0037] The flange portion 42 protrudes radially outward from the outer circumferential surface of the main body portion 41 (see FIGS. 3 and 4). The flange portion 42 is formed into an annular shape as a whole when viewed from the axial direction of the main body portion 41. The flange portion 42 also has a tongue portion 43 extending in a cantilever shape from a part of the annular outer circumferential end. The tongue portions 43 are provided in a pair along the radial direction of the main body portion 41.

[0038] Fig. 4 shows the appearance of the acoustic transducer 10A as viewed from the magnetic circuit section 20 side along the vibration direction. Fig. 5 shows the appearance of the acoustic transducer 10A as viewed from the side. As shown in Figs. 4 and 5, a pair of tongue sections 43 provided on the pressing section 40 are provided protruding from both sides in the width direction of the frame section 50, and are exposed to the outside of the frame section 50.

[0039] When attaching the vibration part 30 of the acoustic transducer 10A to the glass roof 14, the flange part 42 is pressed along the vibration direction, so that the pressing part 40 can be pressed against the glass roof 14. In this embodiment, it is sufficient to press the tongue part 43 exposed to the outside of the frame part 50 when viewed from the pressing direction. This makes it possible to easily and sufficiently press the joining surface S1 of the pressing part 40 when joining the pressing part 40 to the glass roof 14 via the support member 60A.

[0040] Fig. 7 shows a cross section of the pressing part 40 passing through the tongue part 43. As shown in Fig. 7, the joint surface S1 of the main body part 41 protrudes towards the glass roof 14 side (the side that is subject to vibration) with respect to the flange part 42. Therefore, it is possible to increase the pressing load acting on the joint surface S1 of the main body part 41 when the flange part 42 is pressed.

[0041] Moreover, the plate thickness T1 of the joint surface S1 is set to be thicker than the plate thickness T2 of the flange portion 42. Therefore, the main body portion 41 is less likely to deform when the flange portion 42 is pressed, so that deformation of the bobbin 32 and the voice coil 31 fixed to the main body portion 41 can be suppressed.

[0042] (Frame part) Fig. 3 is a side view of the acoustic transducer 10A, showing the appearance seen from the side of the frame portion 50. As shown in Fig. 3, the frame portion 50 has a holding portion 51 that holds the magnetic circuit portion 20, and a pair of extension portions 52 that extend from the holding portion 51 and are fixed to the glass roof 14.

[0043] The holding portion 51 is formed in a cylindrical shape penetrating in the axial direction. The holding portion 51 has an open end provided on one side in the axial direction that serves as a receptacle for the magnetic circuit portion 20, and the pot-shaped yoke 21 is inserted from the open end. A stepped portion 511 that protrudes radially inward is formed in the axial middle portion of the holding portion 51 (see FIG. 2). The open end of the pot-shaped yoke 21 inserted inside the holding portion 51 is fixed to the stepped portion 511.

[0044] The holding portion 51 has a cylindrical shape as described above, and thus exposes at least a portion of the magnetic circuit portion 20 when the magnetic circuit portion 20 is held. In this embodiment, the bottom of the pot-shaped yoke 21 is exposed to the outside of the holding portion 51. This allows heat generated in the magnetic circuit portion 20 to be efficiently released to the outside.

[0045] The extension portion 52 has a fixing portion 53 that is fixed to the glass roof 14 , and an elastic portion 54 provided between the fixing portion 53 and the holding portion 51 .

[0046] The fixing portion 53 is formed in a plate shape with its plate thickness direction coinciding with the vibration direction of the acoustic transducer 10A, and is fixed to the glass roof 14 via a support member 60A.

[0047] The elastic part 54 has a plate-shaped horizontal part 541 extending radially outward from the outer circumferential surface of the holding part 51, and a plate-shaped inclined part 542 extending obliquely from the end of the horizontal part 541 toward the fixed part 53. The elastic part 54 is curved by the horizontal part 541 and the inclined part 542, thereby enhancing elasticity in the vibration direction of the magnetic circuit part 20. That is, the holding part 51 of the frame part 50 is elastically supported by the elastic part 54. Therefore, the frame part 50 has a structure having elasticity in the vibration direction, and the vibration generated between the vibration part 30 and the magnetic circuit part 20 is not suppressed, and the transmission loss of the vibration is reduced. As a result, the transmission efficiency of the vibration to the glass is improved, and the reproducible frequency band can be widened.

[0048] Moreover, when viewed from the vibration direction of the vibrating part 30, the elastic part 54 is disposed between a joint (first joint 61) that joins the fixed part 53 and the glass roof 14, and a joint (second joint 62) that joins the vibrating part 30 and the glass roof 14. As a result, no elastic body is interposed between the joint and the glass roof 14, which is the object of vibration, so that the transmission loss of vibration can be further reduced.

[0049] 4 and 5, the elastic portion 54 has an opening 543 penetrating in the plate thickness direction. Therefore, compared to a plate-like configuration without an opening, the elastic portion 54 becomes more flexible and the elasticity can be further increased.

[0050] The holding portion 51 is supported by the elastic portion 54 and is provided so as to protrude from the fixed portion 53 in the vibration direction of the vibrating portion 30. Therefore, it is possible to ensure a stroke of vibrations generated by the vibrating portion 30 and the magnetic circuit portion 20 mutually. A pair of elastic parts 54 extend from the holding part 51, and the elastic part (first elastic part) of the first extending part 52A, the holding part 51, and the elastic part (second elastic part) of the second extending part 52B are connected in this order to form the frame part 50. As an example, in this embodiment, the pair of elastic parts 54 and the holding part 51 form an arch shape. In this form, the outer shell can be made smaller than when the frame part is configured as a box-shaped enclosure. In addition, the elastic parts 54 are arranged symmetrically with respect to the holding part 51, which is the center of vibration. Therefore, there is an advantage that the deviation in the vibration direction of the magnetic circuit part 20 can be suppressed and the transmission efficiency of vibration to the glass roof 14 can be increased.

[0051] The extending portion 52 is a pair of a first extending portion 52A extending from the holding portion 51 in a first direction and a second extending portion 52B extending in a second direction different from the first direction. The frame portion 50 has an opening 55 formed on the inside by connecting the pair of extending portions 52A, 52B and the holding portion 51. In this embodiment, the first extending portion 52A, the holding portion 51, and the second extending portion 52B further form an arch shape.

[0052] As shown in FIG. 3, the opening 55 is formed on the side of the frame portion 50 and communicates with the space between the holding portion 51 and the flange portion 42 of the pressing portion 40.

[0053] In addition, a terminal block 74 is provided on the fixed portion 53 of the first extending portion 52A. A lead wire (not shown) extending from the voice coil 31 and an external wiring are connected to the terminal block 74. The lead wire extending from the voice coil 31 is connected to the terminal block 74 through an opening 543 formed in the elastic portion 54.

[0054] (Support member) 2 and 6, the support member 60A is a member interposed between the glass roof 14, which is a vibration target, and the frame section 50. The support member 60A has a first joint portion 61 interposed at the joint position between the glass roof 14 and the frame section 50, a second joint portion 62 interposed at the joint position between the glass roof 14 and the vibration section 30 inside the first joint portion 61, and an elastic support portion 63 connecting the first joint portion 61 and the second joint portion 62.

[0055] As an example, the support member 60A is formed in a flat plate shape with the vibration direction as the plate thickness direction, and is formed in a long rectangular shape when viewed from the vibration direction. The support member 60A is, for example, made of a resin molded product, and the first joint portion 61, the second joint portion 62, and the elastic support portion 63 are integrally formed.

[0056] When the acoustic transducer 10A is attached to the glass roof 14, the first joint portion 61 is interposed between the fixing portions 53 of the pair of extension portions 52 and the glass roof 14. The first joint portion 61 has a side surface located on one side in the plate thickness direction fixed to the fixing portions 53, and a side surface S2 located on the other side in the plate thickness direction fixed to the glass roof 14 via an adhesive member 68. The adhesive member 68 is formed of, for example, double-sided tape.

[0057] The second joint portion 62 is interposed between the pressing portion 40 attached to the vibration portion 30 and the glass roof 14 when the acoustic transducer is attached to the glass roof 14. The second joint portion 62 is formed in a circular shape when viewed from the vibration direction, and has a size equivalent to that of the joint surface S1 (bottom surface) of the main body portion 41, which is tubular with a bottom, in the pressing portion 40.

[0058] The second joint portion 62 has a side surface located on one side in the plate thickness direction joined to the joint surface S1 of the pressing portion 40, and a side surface S3 located on the other side in the plate thickness direction fixed to the glass roof 14 via an adhesive member 68.

[0059] The side surface S3 fixed to the glass roof 14 has a rectangular central region S3a. The central region S3a protrudes in the vibration direction relative to other regions of the side surface S3. Therefore, the central region S3a of the side surface S3 is fixed to the glass roof 14 via the adhesive member 68.

[0060] Fig. 8(B) is a plan view showing a part of the support member in an enlarged scale. As shown in Fig. 8(B), the second joint portion 62 has a size equivalent to that of the joint surface S1 (bottom surface) of the pressing portion 40, and the diameter φ1 of the second joint portion 62 is larger than the diameter (reference number omitted) of the voice coil 31. Therefore, when the second joint portion 62 is bonded to the glass roof 14, the pressure load acting from the voice coil 31 and bobbin 32 of the vibrating portion 30 is received over a wide area of ​​the second joint portion 62, and the bond between the glass roof 14 and the joint surface can be stabilized.

[0061] On the other hand, the diameter φ2 of the central region S3a of the side surface S3 of the second joint portion 62 is smaller than the diameter φ1 of the second joint portion 62. Furthermore, in this embodiment, the diameter φ2 of the central region S3a is set to be smaller than the diameter of the voice coil (reference number omitted). This reduces the joint area between the second joint portion 62 and the glass roof 14, thereby improving the transmission efficiency of the vibration transmitted from the vibrating portion 30 to the glass roof 14.

[0062] In this way, by increasing the contact area with the vibration part 30 and decreasing the contact area with the glass roof 14, it is possible to improve workability during installation and improve vibration transmission during use.

[0063] On the other hand, the elastic support portion 63 extends in a flat band shape and connects the first joint portion 61 and the second joint portion 62. This elastic support portion 63 essentially connects the frame portion 50 and the vibration portion 30 arranged inside the frame portion 50. Therefore, the radial movement of the vibration portion 30 is restricted by the elastic support portion 63. In addition, the vibration portion 30 is elastically supported by the elastic support portion 63 so that it is allowed to move in the vibration direction relative to the frame portion 50.

[0064] That is, the support member 60A properly maintains the position of the vibration part 30 relative to the frame part 50. This allows the vibration part 30 to move in the vibration direction in a narrow magnetic gap without contacting the magnetic circuit part 20. In known acoustic transducers in which the vibration target and the frame are integrally configured, such a support member is provided as a damper. The damper is also called a spider.

[0065] Generally, in an acoustic transducer that is constructed integrally with a vibration target, a vibration part is elastically supported by a frame part via a plate-shaped damper with a corrugated wave shape. The damper is disposed between the vibration target and the vibration part, and is often included in the frame part.

[0066] In contrast, in the acoustic transducer 10A according to this embodiment, the support member 60A disposed between the frame portion 50 and the glass roof 14 is structured to function as a damper. Therefore, the frame portion 50 can be made smaller in size compared to a structure in which a damper is incorporated in the frame portion 50. In particular, there is an advantage in that the height of the outer shell of the frame portion 50 can be suppressed, and the amount of protrusion from the glass roof 14 is reduced.

[0067] Furthermore, by disposing the support member 60A between the frame section 50 and the glass roof 14, it is possible to stabilize the joint surface between the glass roof 14 and the vibration section 30. That is, the joint position (second joint section 62) between the vibration section 30 and the glass roof 14 is disposed inside the frame section 50 relative to the joint position (first joint section 61) between the frame section 50 and the glass roof 14, making the work difficult and making it difficult to stabilize the joint surface. In particular, when the mounting surface is curved, as in the case of the glass roof 14, it becomes even more difficult to stabilize the joint surface.

[0068] However, in this embodiment, when the elastic support portion 63 deforms to conform to the shape of the mounting surface, the positions of the first joint portion 61 and the second joint portion 62 are displaced following the deformation of the elastic support portion 63. As a result, the second joint portion 62, which is disposed on the inside of the frame portion 50, is also disposed in an optimal position to conform to the shape of the mounting surface, so that the joint surface of the second joint portion 62 can be stabilized.

[0069] Furthermore, for example, when the mounting surface is a concave curved surface as in this embodiment, the linear distance between the first joints 61 is smaller than when the mounting surface is a flat surface. In this case, the elastic support portion 63 bends so that the support member 60A becomes convex toward the concave curved surface, and the joint surface of the second joint portion 62 can be stabilized. When the mounting surface is a convex curved surface, the opposite occurs, and the elastic support portion 63 bends so that the support member 60A becomes concave toward the convex curved surface, thereby stabilizing the joint surface of the second joint portion 62.

[0070] In this embodiment, the elastic support portion 63 is formed in a plate shape with the vibration direction of the vibrating portion 30 as the plate thickness direction, and has an opening 64 penetrating in the plate thickness direction. This opening 64 makes the elastic support portion 63 flexible, and further enhances the elasticity in the vibration direction.

[0071] Fig. 8(A) is a side view showing a part of the support member 60A in an enlarged manner. As shown in Fig. 8(A), the support member 60A has a plate thickness T3 of the first joint portion 61 and a plate thickness T4 of the second joint portion 62 that are different from each other. Therefore, the support member 60A is configured such that, at the joint position with the glass roof 14, a position D1 of the joint surface (side surface S2) of the first joint portion 61 and a position D2 of the joint surface (central region S3a of side surface S3) of the second joint portion 62 are different in the vibration direction.

[0072] In this embodiment, the plate thickness T4 of the second joint portion 62 is thicker than the plate thickness T3 of the first joint portion 61. Therefore, the joint surface (central region S3a) of the second joint portion 62 protrudes in the vibration direction further than the joint surface (side surface S2) of the first joint portion 61. Therefore, when attaching the acoustic transducer 10A to the concave curved surface of the glass roof 14, the second joint portion 62 can be brought into contact with the attachment surface before the first joint portion 61, and the pressing load acting on the second joint portion 62 (vibration portion 30) can be increased. This makes it possible to stabilize the joining state of the acoustic transducer to the concave curved surface.

[0073] FIG. 8(A) shows the position difference Δd1 of the joint surface with the glass roof 14 at the first joint portion 61 and the second joint portion 62. FIG. 9 shows the position difference Δd2 of the mounting surface of the glass roof 14 at the first joint portion 61 and the second joint portion 62. As shown in FIG. 8(A) and FIG. 9, the position difference Δd1 of the joint surface at the first joint portion 61 and the second joint portion 62 of the support member 60A is set to be larger than the position difference Δd2 of the mounting surface of the glass roof 14. Therefore, the protrusion amount (Δd1) of the joint surface is larger than the protrusion amount (Δd2) of the curved surface of the glass roof 14. Therefore, the second joint portion 62 can be brought into contact with the mounting surface before the first joint portion 61, and the pressing load acting on the second joint portion 62 (vibration portion 30) can be increased in accordance with the curvature of the glass roof 14.

[0074] The positions of the joint surfaces of the first joint portion 61 and the second joint portion 62 may be adjusted without changing the plate thickness, for example, by subjecting the joint portions to embossing or the like.

[0075] 8(B), the first joint portion 61 and the second joint portion 62 have at least one groove portion 65A extending in one direction from the edge of the joint surface with the glass roof 14. This allows air that has entered the joint surface when the acoustic transducer 10A is attached to the glass roof 14 to escape from the groove portion, thereby preventing air from pooling on the joint surface.

[0076] In this embodiment, the groove 65A is provided by intersecting a first groove 65Aa1 and a second groove 65Aa2 extending in different directions. The first groove 65Aa1 and the second groove 65Aa2 each cross the joint surface. This allows air that has entered the joint surface to escape to the multiple grooves extending in multiple directions, making it possible to more effectively prevent air pockets from forming.

[0077] (Action and Effects) Next, the operation and effects of the first embodiment will be described.

[0078] The acoustic transducer 10A of the first embodiment comprises a magnetic circuit section 20 fixed to the glass roof 14 via a frame section 50, and a vibration section 30 that vibrates relative to the magnetic circuit section 20 by being inserted into the magnetic gap formed by the magnetic circuit section 20, and a pressing section 40 is attached to the vibration section 30.

[0079] Here, the pressing part 40 has a main body part 41 having a joining surface S1 to be joined to the glass roof 14, and a flange part 42 protruding from the outer circumferential surface of the main body part 41. The pressing part 40 can press the joining surface S1 of the main body part 41 against the glass roof 14 by pressing the flange part 42. Therefore, the vibration part 30 can be sufficiently pressed against the glass roof 14 which is formed as a separate body.

[0080] In addition, the joint surface S1 of the main body 41 protrudes toward the glass roof 14 relative to the flange 42. Therefore, when the flange 42 is pressed, the joint surface S1 of the main body 41 can be pressed against the glass roof 14 before the flange 42.

[0081] 7, the plate thickness T1 of the joint surface S1 of the main body 41 is thicker than the plate thickness T2 of the flange 42. Therefore, the main body 41 is less likely to deform when the flange 42 is pressed, so that deformation of the bobbin 32 and the voice coil 31 fixed to the main body 41 can be suppressed.

[0082] 4, in this embodiment, the pressing portion 40 is provided with a tongue portion 43 extending in a cantilever shape from the flange portion 42, and the tongue portion 43 is exposed to the outside of the frame portion 50 when viewed from the pressing direction of the flange portion 42. Therefore, when pressing the pressing portion 40 against the glass roof 14, it is only necessary to press the tongue portion 43 exposed to the outside of the frame portion 50 when viewed from the pressing direction. This makes it possible to easily and sufficiently press the joining surface S1 of the pressing portion 40 when joining the pressing portion 40 to the glass roof 14.

[0083] In this embodiment, the frame section 50 has a holding section 51 that holds the magnetic circuit section 20, a fixing section 53 that is fixed to the glass roof 14, and an elastic section 54 that is provided between the holding section 51 and the fixing section 53 and elastically supports the holding section 51. This gives the frame section 50 a structure that has elasticity in the vibration direction, and as a result, the vibrations generated between the vibrating section 30 and the magnetic circuit section 20 are not suppressed, improving the efficiency of vibration transmission to the glass, and therefore the reproducible frequency band can be widened.

[0084] Specifically, in this embodiment, the frequency band that can be reproduced by the glass roof 14 is set to 800 [Hz] to 20 [kHz].

[0085] In this embodiment, the holding portion 51 of the frame portion 50 is supported by the elastic portion 54 and is provided to protrude from the fixed portion 53 in the vibration direction of the vibrating portion 30. This makes it possible to ensure a stroke of vibrations generated by the vibrating portion 30 and the magnetic circuit portion 20 mutually.

[0086] In this embodiment, the frame portion 50 is formed by connecting the elastic portion (first elastic portion) of the first extending portion 52A, the holding portion 51, and the elastic portion (second elastic portion) of the second extending portion 52B in this order. Therefore, the outer shell can be made smaller than when the frame portion 50 is configured as a box-shaped enclosure. Also, the elastic portion 54 is disposed symmetrically with respect to the holding portion 51, which is the center of vibration. Therefore, it is possible to suppress deviation in the vibration direction of the magnetic circuit portion 20 and to increase the efficiency of transmission of vibration to the glass roof 14.

[0087] Moreover, the elastic portion 54 is formed in a plate shape extending from the holding portion 51 to the fixed portion 53, and has an opening 543 penetrating in the plate thickness direction. The opening 543 makes the elastic portion more flexible and increases the elasticity in the vibration direction, compared to a configuration in which the elastic portion is formed in a plate shape without an opening.

[0088] Furthermore, the elastic portion 54 is disposed between the first joint portion 61 and the second joint portion 62 of the support member 60A when viewed from the vibration direction of the vibrating portion 30. This makes it possible to reduce the transmission loss of vibration since no elastic body is interposed between the joint portion and the glass roof 14, which is the object of vibration.

[0089] Furthermore, when the magnetic circuit section 20 is held by the holding section 51, at least a portion of the magnetic circuit section 20 is exposed. This allows heat generated in the magnetic circuit section 20 to be efficiently released to the outside.

[0090] In the acoustic transducer 10A according to this embodiment, the support member 60A has a first joint 61 interposed at the joint position between the glass roof 14 and the frame section 50, a second joint 62 interposed at the joint position between the glass roof 14 and the vibration section 30 inside the first joint 61, and an elastic support section 63 that connects the first joint 61 and the second joint 62 and elastically supports the vibration section 30 with respect to the frame section 50. Therefore, when the acoustic transducer 10A is attached to the glass roof 14, the elastic support section 63 deforms along the shape of the attachment surface. At this time, the positions of the first joint 61 and the second joint 62 are displaced following the deformation of the elastic support section 63, so that the second joint 62 arranged inside the frame section 50 is also arranged at an optimal position according to the shape of the attachment surface. This makes it possible to stabilize the joint surface of the second joint 62.

[0091] Furthermore, the support member 60A is configured such that the positions of the joint surfaces of the first joint portion 61 and the second joint portion 62 at the joint position with the glass roof 14 are different in the vibration direction of the vibrating portion 30. Therefore, when the mounting surface is curved, by making the joint surface of one joint portion protrude in the vibration direction further than the joint surface of the other joint portion, it is possible for one joint portion to come into contact with the vibration target before the other joint portion. This makes it possible to effectively increase the pressure load acting on the joint portion that comes into contact first in accordance with the curved shape of the mounting surface.

[0092] 8(A), in this embodiment, at the joining position of support member 60A with glass roof 14, which has a concave curved surface, the joining surface of second joining portion 62 protrudes in the vibration direction relative to the joining surface of first joining portion 61. Therefore, the joining surface of second joining portion 62 comes into contact with the mounting surface of glass roof 14 before the joining surface of first joining portion 61. This makes it possible to effectively increase the pressing load at the joining position between glass roof 14 and vibration portion 30.

[0093] Furthermore, the support member 60A is configured such that the position difference Δd1 between the joint surfaces at the first joint portion 61 and the second joint portion 62 is larger than the position difference Δd2 of the mounting surface of the glass roof 14. As a result, the protrusion amount (Δd1) of the joint surfaces can be made larger than the protrusion amount (Δd2) of the curved surface of the glass roof 14, and the pressing load acting on the joint portion that comes into contact first can be effectively increased in accordance with the curvature of the mounting surface.

[0094] 8(B), each of the first bonding portion 61 and the second bonding portion 62 has at least one groove 65A extending in one direction from the edge of the bonding surface with the glass roof 14. This allows air that has entered the bonding surface to escape from the groove, thereby preventing air from pooling on the bonding surface.

[0095] Furthermore, the groove 65A has a first groove 65Aa1 and a second groove 65Aa2 extending in different directions, so that air that has entered the joint surface can escape to the multiple grooves extending in multiple directions, effectively preventing air pockets from forming.

[0096] <Second embodiment> Hereinafter, an acoustic transducer 10B according to the second embodiment will be described with reference to Fig. 10(A) and Fig. 10(B). Note that the same components as those in the first embodiment are given the same reference numerals and detailed description will be omitted. The acoustic transducer 10B according to the second embodiment differs from the acoustic transducer 10A according to the first embodiment in that the flange portion 42 attached to the vibration portion 30 does not have a tongue portion 43 formed thereon.

[0097] A notch 56A is formed in the frame portion 50 of the acoustic transducer 10B at a position overlapping with the flange portion 42 along the pressing direction of the flange portion 42 (the vibration direction of the vibration portion 30). As a result, the flange portion 42 is exposed to the outside of the frame portion 50 when viewed from the pressing direction, similar to the first embodiment.

[0098] The cutout portions 56A are formed in the extending portion 52 in the plate-shaped horizontal portion 541 that extends radially outward from the outer circumferential surface of the holding portion 51. The cutout portions 56A penetrate the horizontal portion 541 in the plate thickness direction, and are formed in a semicircular shape, for example. The cutout portions 56A are provided in pairs on both ends of the frame portion 50 in the width direction.

[0099] According to the above-mentioned configuration, when the pressing part 40 is pressed against the glass roof 14, the flange part 42 is pressed through the cutout part 56A. This allows the joining surface S1 of the pressing part 40 to be easily and sufficiently pressed.

[0100] Furthermore, in the acoustic transducer 10B according to the second embodiment, the flange portion 42 of the pressing portion 40 does not protrude from the outer shell of the frame portion, so that the acoustic transducer 10B can be made smaller in size than the first embodiment.

[0101] <Third embodiment> Hereinafter, an acoustic transducer 10C according to a third embodiment will be described with reference to Fig. 11(A) and Fig. 11(B). Note that the same components as those in the first embodiment are given the same reference numerals and detailed description will be omitted. The acoustic transducer 10C according to the third embodiment differs from the acoustic transducer 10A according to the first embodiment in that the flange portion 42 attached to the vibration portion 30 does not have a tongue portion 43 formed thereon.

[0102] In the acoustic transducer 10C according to the third embodiment, a jig 70 for pressing the flange 42 can be inserted through an opening 55 formed on the side of the frame 50. The jig 70 is made of a plate-shaped member, and has a gripping portion 71 that is held by an operator, and a pair of pressing pieces 72 that extend from the gripping portion 71 in a cantilever shape.

[0103] As described above, the opening 55 formed on the side of the frame portion 50 communicates with the holding portion 51 that holds the magnetic circuit portion 20 and the space between the holding portion 51 and the flange portion 42. When pressing the pressing portion 40 against the glass roof 14, a jig 70 is inserted from the opening 55 and the pair of pressing pieces 72 is positioned so that the body portion 41 of the pressing portion 40 is sandwiched between them and the pressing pieces 72 overlap with the flange portion 42. Then, by pressing the flange portion 42 with the pressing pieces 72, the pressing portion 40 can be pressed against the glass roof 14. This allows the joining surface S1 of the pressing portion 40 to be easily and sufficiently crimped.

[0104] Furthermore, in the acoustic transducer 10C according to the third embodiment, the flange portion 42 of the pressing portion 40 does not protrude from the outer shell of the frame portion, so that the acoustic transducer 10C can be made smaller in size than the first embodiment.

[0105] <Fourth embodiment> An acoustic transducer 10D according to a fourth embodiment will be described below with reference to Fig. 12(A) and Fig. 12(B). The same components as those in the first embodiment are denoted by the same reference numerals and detailed description will be omitted. The acoustic transducer 10D according to the fourth embodiment differs from the acoustic transducer 10A according to the first embodiment in that the flange portion 42 attached to the vibration portion 30 does not have a tongue portion 43 formed thereon.

[0106] A notch 56B is formed in the frame portion 50 of the acoustic transducer 10D at a position overlapping the flange portion 42 along the pressing direction of the flange portion 42 (the vibration direction of the vibration portion 30). As a result, the flange portion 42 is exposed to the outside of the frame portion 50 when viewed from the pressing direction, similar to the first embodiment.

[0107] The cutout portions 56B are formed in the extending portion 52, in the plate-shaped horizontal portion 541 that extends radially outward from the outer circumferential surface of the holding portion 51. The cutout portions 56B penetrate the horizontal portion 541 in the plate thickness direction, and are formed in a rectangular shape, for example. The cutout portions 56B are provided in pairs on both ends of the frame portion 50 in the width direction.

[0108] An elastic pressing portion 57 is provided in the frame portion 50 so as to bridge the cutout portion 56B. This elastic pressing portion 57 is disposed on the side of the main body portion 41 of the pressing portion 40. In addition, the elastic pressing portion 57 is disposed on the outer side of the frame portion 50 with respect to the vibrating portion 30.

[0109] The elastic pressing portion 57 can be made of an elastic member such as rubber or a leaf spring, and is elastically deformed inward (toward the main body portion 41) when pressed from the side of the frame portion 50 in the direction of the arrow shown in Fig. 12(A). As shown in Fig. 12(B), the elastic pressing portion 57 is elastically deformed inward and positioned at a position overlapping with the flange portion 42. This allows the flange portion 42 to be pressed via the elastic pressing portion 57, and when the pressing portion 40 is pressed against the glass roof 14, the joint surface S1 of the pressing portion 40 can be easily and sufficiently crimped.

[0110] Furthermore, since the elastic pressing portion 57 is disposed outside the vibration portion 30, even after the acoustic transducer 10D is attached, it is provided at a position that does not interfere with the vibration of the vibration portion 30 when it is driven.

[0111] Furthermore, in the acoustic transducer 10D according to the fourth embodiment, the flange portion 42 of the pressing portion 40 does not protrude from the outer shell of the frame portion, so that the acoustic transducer 10C can be made smaller in size than the first embodiment.

[0112] <Modifications of the Support Member> Hereinafter, with reference to FIGS. 13(A) to 13(C) and 14, variations of modified examples of the support member 60A according to each of the above embodiments will be described.

[0113] Fig. 13(A) is a side view of a support member 60B according to a first modification. As shown in Fig. 13(A), in the support member 60B, the plate thickness T3 of the first joint portion 61 is greater than the plate thickness T4 of the second joint portion 62. Therefore, in the joint portion with the vibration target, the joint surface (side surface S2) of the first joint portion of the support member protrudes in the vibration direction relative to the joint surface (central region S3a of side surface S3) of the second joint portion 62. Therefore, when the mounting surface is a convex curved surface, the second joint portion 62 comes into contact with the mounting surface of the glass roof 14 first, and immediately thereafter, the first joint portion 61 can come into contact with the glass roof 14. This effectively increases the pressing load of the second joint portion 62, and stabilizes the state in which the acoustic transducer is joined to the convex curved surface.

[0114] Fig. 13(B) is a plan view of a support member 60C according to a second modification. In each of the above-described embodiments, the second joint portion is configured such that only the central region S3a of the side surface S2 facing the glass roof 14 is joined to the glass roof 14 via the adhesive member 68. In the support member 60C according to the second modification, as shown in Fig. 13(B), substantially the entire side surface S3 of the second joint portion 62 serves as a joint surface with the glass roof 14. In this case, the diameter φ3 of the joint surface with the glass roof 14 is configured to be larger than the diameter (reference number omitted) of the voice coil 31, and the vibration portion 30 can be strongly joined to the glass roof 14.

[0115] 13(C) is a plan view of a support member 60D according to a third modified example. As in the above-described embodiments, the first joint portion 61 and the second joint portion 62 of the support member 60D according to the third modified example have a plurality of grooves 65B extending in one direction from the edge of the joint surface (side surface S2, central region S3a) with the glass roof 14. The plurality of grooves 65B each extend from different positions on the edge of the joint surface toward the center. This allows air that has entered the joint surface to escape to the plurality of grooves extending in multiple directions, effectively preventing air pockets from occurring.

[0116] FIG. 14 is a perspective view of a support member 60E according to a fourth modified example. In the support member 60E according to the fourth modified example, a ring portion 80 formed in an annular shape is provided at the first joint portion 61 and the second joint portion 62. At the first joint portion 61, the ring portion 80 is formed on the outer periphery of the first joint portion 61. The ring portion 80 protrudes in a bank shape from the center portion of the first joint portion 61. Therefore, at the first joint portion 61, the side surface S2 that is joined (bonded) to the glass roof 14 can be formed in an annular shape. On the other hand, at the second joint portion 62, the ring portion 80 is formed by making the central region S3a of the second joint portion 62 protrude in a bank shape. Therefore, at the second joint portion 62, the side surface (central region S3a) that is joined (bonded) to the glass roof 14 can be formed in an annular shape. Furthermore, a groove 65C is formed on the surface (side surface S, central region S3a) of the ring portion 80 to communicate the inside and outside of the ring portion 80. The groove 65C may be one or more. Each groove 65C extends in one direction from the edge of the joint surface (side surface S2, central region S3a) with the glass roof 14 toward the center in the first joint portion 61 and the second joint portion 62. As a result, air that has entered the inside of the ring portion 80 is released to the outside of the ring portion 80 through the groove 65C, so it does not remain on the joint surface. The ring portion 80 can obtain a stable adhesive strength on the joint surface (side surface S2, central region S3a) with the glass roof 14.

[0117] In the above embodiment and each modified example, the support member is bonded to the vibration target using an adhesive member, but the present disclosure is not limited to this. The support member and the frame portion may be bonded to the vibration target by mechanical bonding such as fastening. [supplementary explanation]

[0118] In the above-described embodiments and modified examples, the acoustic transducer is configured to be attached to a glass roof, but the present disclosure is not limited to this. The object to which the acoustic transducer is attached is not limited to a vehicle, and may be any plate-shaped member. In addition, if the object is a vehicle, the acoustic transducer may be attached to a window glass such as a front windshield, rear windshield, or side windshield of the vehicle. The acoustic transducer may also be attached to a pillar or a side surface of the vehicle body.

[0119] In addition, in each of the above embodiments and modified examples, the acoustic transducer is attached to a concave curved surface, but the present disclosure is not limited to this. The acoustic transducer may be attached to a convex curved surface or a flat surface. Furthermore, the vibration target configured as a separate body is not limited to plate-shaped glass. The vibration target may be, for example, a plate-shaped member formed of a material such as resin, metal, wood, cloth, or paper.

[0120] The configurations of the acoustic transducers according to the above embodiments and modified examples can be applied to both a moving coil type acoustic transducer that vibrates a voice coil and a moving magnet type acoustic transducer that vibrates a magnetic circuit portion.

[0121] In the above embodiment and modified example, the frame portion includes a pair of extending portions, but is not limited thereto. The frame portion may include three or more extending portions, or may include one extending portion. [Explanation of symbols]

[0122] 10A Acoustic Transducer (Speaker Acoustic Transducer) 10B Acoustic transducer (acoustic transducer for speaker) 10C Acoustic transducer (acoustic transducer for speakers) 10D Acoustic Transducer (Speaker Acoustic Transducer) 12 Vehicles 14 Glass roof (vibration target) 20 Magnetic circuit section 30 Vibration section 31 Voice coil 40 Pressing part 41 Main body 42 Flange 50 Frame section 51 Holding part 52 Extension part 53 Fixed part 54 Elastic portion (first elastic portion, second elastic portion) 543 Opening 55 Opening 57 Elastic pressing part 60A Support member 60B Support member 60C support member 60D Support member 61 1st joint 62 Second joint 63 Elastic support part 64 Opening 65A Groove 65B Groove D1 Position of the joint surface of the first joint D2 Position of the joint surface of the second joint Δd1 Position difference of the joint surface Δd2 Position difference of mounting surface S1 Joint surface (main body joint surface) S2 Side (joint surface of the first joint) S3a Central area (joint surface of second joint) T1 Plate thickness of the joint surface of the main body T2 Plate thickness of flange

Claims

1. a magnetic circuit portion fixed to a vibration target via a frame portion; a vibration part that vibrates relative to the magnetic circuit part; a pressing section that is attached to the vibration section and has a main body section having a joining surface to be joined to the vibration target and a flange section protruding from an outer circumferential surface of the main body section, and that can press the joining surface against the vibration target by pressing the flange section; An acoustic transducer for a speaker comprising:

2. The flange portion is exposed to the outside of the frame portion when viewed from a pressing direction of the flange portion.

2. The acoustic transducer for a speaker according to claim 1.

3. The joint surface protrudes toward the vibration target side relative to the flange portion.

2. The acoustic transducer for a speaker according to claim 1.

4. The plate thickness of the joint surface is thicker than the plate thickness of the flange portion.

2. The acoustic transducer for a speaker according to claim 1.

5. The frame portion is a holding portion that holds the magnetic circuit portion; and an opening that communicates with a space between the holding portion and the flange portion and allows a jig to be inserted from a side of the frame portion.

2. The acoustic transducer for a speaker according to claim 1.

6. The frame portion is The vibration device further includes a pair of extension parts extending from the holding part and fixed to the vibration target, and the pair of extension parts and the holding part are connected to form the opening on the inside.

6. The acoustic transducer for a speaker according to claim 5.

7. The frame portion has an elastic pressing portion disposed on a side of the main body portion, The elastic pressing portion is disposed at a position overlapping the flange portion by elastically deforming toward the main body portion, and is configured to be able to press the flange portion via the elastic pressing portion.

2. The acoustic transducer for a speaker according to claim 1.

8. The elastic pressing portion is disposed radially outward from the vibration portion.

8. The acoustic transducer for a speaker according to claim 7.

Images