Vibration speaker mounting device and sound generator

Abstract

To provide a vibration speaker mounting device that can improve sound quality produced by the vibration of a member to be vibrated while improving reliability, and a sound generator including the same.SOLUTION: A mounting device 4 attaches a vibration speaker 2, which has a vibration transmission part 7, to a member 3 to be vibrated. The mounting device 4 includes a holding part 20 that holds the vibration speaker 2 while being in a state of being in contact with the vibration transmission part 7, a mounting part 30 that mounts the holding part 20 to the member 3 to be vibrated, and an adjustment part 35 that adjusts the contact force between the holding part 20 and the member 3 to be vibrated when the holding part 20 is mounted on the member 3 to be vibrated by the mounting part 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an attachment device for attaching a vibration speaker to a vibrated member, and to an acoustic generator equipped with the same. [Background technology]

[0002] Conventionally, there is known a vibration speaker (a vibration type sound generator) that is attached to a vibrated member, comes into contact with the vibrated member, and generates sound by applying vibration to the contact part to cause resonance. This vibration speaker is applied to a vibrated member such as a duct part of an air conditioner for a vehicle or a helmet (for example, see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-162163 A (Pages 3-4, Figures 1-3) [Patent Document 2] JP 2008-236637 A (pages 4-5, Figures 1-5) Summary of the Invention [Problem to be solved by the invention]

[0004] In the configurations described in the above patent documents, the vibration speaker is merely attached to the duct portion or the helmet, and there is a need to improve reliability against vibrations while the vehicle is traveling and against temperature changes in the installation portion, such as the inside of the instrument panel where the duct portion is installed.

[0005] Furthermore, when attaching a bracket holding a vibration speaker to a helmet as in the configuration described in Patent Document 2, it is desirable to stabilize the contact between the vibration transmission part of the vibration speaker and the helmet in order to improve the sound quality produced by resonance in the helmet.

[0006] The present invention has been made in consideration of these points, and aims to provide a mounting device for a vibration speaker that can improve the sound quality produced by the vibration of a vibrated member while improving reliability, and an acoustic generator equipped with the same. [Means for solving the problem]

[0007] The vibration speaker mounting device described in claim 1 is a vibration speaker mounting device for mounting a vibration speaker having a vibration transmission part to a vibrated member, and comprises a holding part that holds the vibration speaker in contact with the vibration transmission part, a mounting part that mounts the holding part to the vibrated member, and an adjustment part that adjusts the contact force between the holding part and the vibrated member when the holding part is mounted to the vibrated member by the mounting part.

[0008] The vibration speaker mounting device of claim 2 is a vibration speaker mounting device of claim 1, in which the adjustment portion is an elastic portion that elastically presses the holding portion against the vibrated member in the mounting direction of the holding portion to the vibrated member by the mounting portion.

[0009] The mounting device for a vibration speaker as described in claim 3 is a mounting device for a vibration speaker as described in claim 2, in which the holding portion has a convex portion for contacting the vibrated member, and the convex portion is protruded in the direction in which the mounting portion mounts the holding portion to the vibrated member.

[0010] The vibration speaker mounting device of claim 4 is a vibration speaker mounting device of claim 1, in which the holding portion has a regulating portion that regulates the position of the vibration speaker, and the regulating portion defines an opening into which the vibration speaker is inserted at least in a direction intersecting the protruding direction of the convex portion.

[0011] The acoustic generator described in claim 5 comprises a vibration speaker having a vibration transmission section, a vibrated member, and an attachment device described in any one of claims 1 to 4 for attaching the vibration speaker to the vibrated member.

[0012] The sound generator according to claim 6 is the sound generator according to claim 5, wherein the vibrated member is a duct portion of an air conditioner for a vehicle that blows out conditioned air. Effect of the Invention

[0013] According to the mounting device for a vibration speaker described in claim 1, the sound quality generated by the vibration of the vibrated member can be improved while improving reliability.

[0014] According to the vibration speaker mounting device of claim 2, in addition to the effects of the vibration speaker mounting device of claim 1, even if the vibrated member to be brought into contact with the holding portion is, for example, hard, the holding portion can be reliably pressed against the vibrated member by pressing the adjustment portion.

[0015] According to the vibration speaker mounting device of claim 3, in addition to the effects of the vibration speaker mounting device of claim 2, the holding portion can be reliably and stably pressed against the vibrated member via the convex portion by pressing the adjustment portion.

[0016] According to the vibration speaker mounting device of claim 4, in addition to the effect of the vibration speaker mounting device of claim 1, the vibration speaker can be easily mounted and held on the holding part by inserting the vibration speaker into the holding part from the opening.

[0017] According to the sound generator of claim 5, it is possible to provide a sound generator that can reliably transmit vibrations of the vibration transmitting portion of the vibration speaker to the vibrated member via the mounting device, thereby stably producing loud sound.

[0018] According to the sound generator of claim 6, in addition to the effect of the sound generator of claim 5, it is possible to provide an air conditioner that also functions as a speaker that outputs sound. [Brief description of the drawings]

[0019] [Figure 1]1 is a cross-sectional view of a portion of an acoustic generator in which a vibration speaker is attached to a vibrated member by using a mounting device for a vibration speaker according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a perspective view of the mounting device and the vibration speaker. [Diagram 3] FIG. [Figure 4] FIG. 2A is a perspective view of the acoustic generator, and FIG. 2B is an enlarged perspective view of a portion of FIG. [Diagram 5] FIG. 11 is a bottom view of the mounting device according to the second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] A first embodiment of the present invention will now be described with reference to the drawings.

[0021] 4(a) and 4(b), reference numeral 1 denotes an acoustic generator, which is an audio speaker system configured by attaching a vibration speaker 2 via an attachment device 4 to a vibrated member 3 that is used as a diaphragm vibrated by the vibration speaker 2. The acoustic generator 1 of this embodiment is for use in a vehicle, for example, and will be described using as an example a sound duct that uses a duct portion of a vehicle air conditioner that blows out conditioned air as the vibrated member 3.

[0022] The vibration speaker 2 shown in FIG. 2 is also called an actuator speaker. The vibration speaker 2 includes a main body 6 and a vibration transmission unit 7. The main body 6 is a part that converts an electric signal transmitted from a signal source into mechanical vibration. The main body 6 includes a magnet that generates a magnetic field, a voice coil that is electrically connected to the signal source, and the like, inside a case 10. The main body 6 is configured such that an electric signal flows through the voice coil located in the magnetic field generated by the magnet, and the voice coil vibrates in response to the electric signal by electromagnetic force. In this embodiment, the case 10 is formed, for example, in a hollow cylindrical shape, and the voice coil is movably positioned along the axial direction. In the following, for clarity of explanation, one end side of the case 10 or the main body 6 in the axial direction is referred to as the upper side, and the other end side is referred to as the lower side, and in the drawings, the direction of the arrow U is referred to as the upper side, and the direction of the arrow D is referred to as the lower side.

[0023] The case 10 is formed with a flange portion 11 for holding the vibration speaker 2 to the mounting device 4. The flange portion 11 protrudes outward from the outer periphery of the case 10. In this embodiment, the flange portion 11 is continuous around the entire circumference of the case 10. The flange portion 11 is located between one end and the other end in the axial direction of the main body 6 or the case 10, that is, in the middle portion in the up-down direction. Therefore, the main body 6 or the case 10 extends upward and downward from the flange portion 11. A terminal portion 12 for electrically connecting the voice coil of the main body 6 to a signal source is formed on the upper portion of the flange portion 11.

[0024] The vibration transmitting part 7 is a part that transmits the mechanical vibration generated by the main body part 6 to the vibrated member 3. The vibration transmitting part 7 is located at the lower end of the main body part 6, and is directly or indirectly connected to the voice coil. In this embodiment, the vibration transmitting part 7 is formed in a circular flat plate shape, and the surface opposite to the surface facing the case 10, i.e., the lower surface, serves as the vibration transmitting surface. In the illustrated example, the vibration transmitting part 7 is formed with a smaller diameter than the flange part 11.

[0025] The vibrated member 3 shown in Figures 4(a) and 4(b) is cylindrical with an internal ventilation passage through which the conditioned air passes, and includes an inlet for receiving the conditioned air into the ventilation passage and an outlet 14 for blowing the conditioned air into the vehicle cabin. For example, the vibrated member 3 is a rectangular tube having a cross section perpendicular to the direction in which the conditioned air passes. An adjustment device for adjusting the direction and / or volume of the conditioned air blown into the vehicle cabin may be disposed in the outlet 14. The vibrated member 3 is formed of, for example, synthetic resin.

[0026] In the illustrated example, the vibrated member 3 includes a member body 18 integrally having a first portion 16 extending longitudinally and a second portion 17 extending in a direction intersecting the longitudinal direction of the first portion 16. The second portions 17 are connected to both ends of the first portion 16, respectively, so that the member body 18 is curved in a U-shape. An air outlet 14 is defined at the tip of the second portion 17. In this embodiment, the vibrated member 3 includes a pair of member bodies 18, and the member bodies 18 are connected to each other so that the second portions 17 are adjacent to each other.

[0027] The vibrated member 3 is installed in an installation location, such as inside an instrument panel, with the first portion 16 aligned along the vehicle width direction and the tip of the second portion 17 facing the vehicle interior.

[0028] The vibration speaker 2 is attached to the vibrated member 3 by using an attachment device 4. The attachment device 4 is formed of, for example, synthetic resin. As shown in Fig. 1 and Fig. 2, the attachment device 4 has a holding part 20 that holds the vibration speaker 2. The holding part 20 may have any configuration as long as it can hold the vibration speaker 2, but in this embodiment, it is formed in a box shape having an opening 22 on one side, and is formed as a case body into which the vibration speaker 2 is inserted and held through the opening 22.

[0029] The holding part 20 is integrally provided with a pair of restricting parts 23 that restrict the position of the vibration speaker 2 by sandwiching the vibration speaker 2 in the axial direction, i.e., vertically and horizontally, and a connecting part 24 that is a side wall part connecting between the restricting parts 23. The restricting parts 23, 23 and the connecting part 24 surround the opening 22 on one side.

[0030] The restricting portions 23 are formed in a flat plate shape having a thickness in the vertical direction, and are positioned parallel or approximately parallel to each other. The upper restricting portion 23 forming the top surface portion of the holding portion 20 has a notch 26 formed therein communicating with the opening 22. The notch 26 is formed, for example, in a circular shape concentric or approximately concentric with the restricting portion 23, and has a portion that gradually narrows from a position connected to the opening 22 toward the back side. Due to the notch 26, the upper restricting portion 23 has a hook shape (C shape) having hook portions 27 on both sides of a position connected to the opening 22. The notch 26 gradually widens from the hook portions 27 to the opening 22. The flange portion 11 and the vibration transmitting portion 7 of the main body portion 6 of the vibration speaker 2 inserted into the holding portion 20 from the opening 22 are sandwiched and held from above and below, and the outer periphery above the flange portion 11 of the main body portion 6 (case 10) is held in the notch 26 by the hook portions 27. That is, the vibration transmission part 7 of the vibration speaker 2 held by the holding part 20 is in contact with the lower restricting part 23 forming the bottom surface of the holding part 20. In the illustrated example, the entire vibration transmission surface of the vibration transmission part 7 is in planar contact (pressure contact) with the lower restricting part 23.

[0031] As shown in Figs. 1 and 3, a convex portion 28 is formed on the lower surface, i.e., the outer surface, of the lower restricting portion 23 facing the vibrated member 3. The convex portion 28 is a portion that directly transmits the vibration of the vibration transmitting portion 7 of the vibration speaker 2 held by the holding portion 20 of the mounting device 4 to the vibrated member 3 by contacting the vibrated member 3 when the mounting device 4 is attached to the vibrated member 3. For example, the convex portion 28 is provided at the center of the lower surface of the restricting portion 23 so as to protrude downward, i.e., outward. That is, the protruding direction of the convex portion 28 intersects or is perpendicular to the insertion direction of the vibration speaker 2 into the opening 22. In this embodiment, the convex portion 28 is formed as a small protrusion that is circular when viewed from below. Therefore, the convex portion 28 allows the holding portion 20 attached to the vibrated member 3 by the mounting portion 30 to come into contact with the vibrated member 3 in a point-like manner. In the illustrated example, the convex portion 28 is located at the lowest part of the mounting device 4.

[0032] 1 and 2 is a side surface portion that vertically connects the outer edge portions of the restricting portion 23 except for one side portion. In this embodiment, the restricting portion 23 has a semicircular shape when viewed from the top and bottom, and therefore the connecting portion 24 is a semicylindrical wall portion. The connecting portion 24 covers the side portion of the vibration speaker 2 held by the holding portion 20.

[0033] The holding part 20 is attached and fixed to the vibrated member 3 by the attachment part 30. The attachment part 30 is formed in a flat plate shape having a thickness in the vertical direction. The attachment part 30 is a bracket part that is placed on the vibrated member 3 and fixed to the vibrated member 3 via a fixing member 32 such as a rivet or a clip. In this embodiment, a pair of attachment parts 30 is set for the holding part 20, and is located on the opposite side to each other with respect to the holding part 20. The attachment part 30 has a hole part 33 through which the fixing member 32 is inserted, which penetrates the attachment part 30 in the thickness direction. In the illustrated example, the fixing member 32 is inserted into the hole part 33 from above, so that the attachment direction of the holding part 20 to the vibrated member 3 by the attachment part 30 is downward.

[0034] The mounting portion 30 and the holding portion 20 are connected by an adjustment portion 35. The adjustment portion 35 is formed in a plate shape extending from the connection portion 24 of the holding portion 20 to the mounting portion 30. The adjustment portion 35 is formed in a corrugated shape in the thickness direction. The adjustment portion 35 is an elastic portion to which springiness is imparted by its corrugated shape, and is capable of biasing the holding portion 20 in the up and down directions starting from the mounting portion 30. Therefore, by elastically pressing the convex portion 28 of the holding portion 20 against the vibrated member 3 in the mounting direction of the holding portion 20 to the vibrated member 3 by the mounting portion 30 by the adjustment portion 35, it is possible to adjust the contact force (contact strength) between the convex portion 28 of the holding portion 20 and the vibrated member 3 in a state in which the holding portion 20 is mounted to the vibrated member 3 by the mounting portion 30.

[0035] Next, the operation of the first embodiment will be described.

[0036] When the vibration speaker 2 of the sound generator 1 is attached to the vibrated member 3, the vibration speaker 2 is first held by the attachment device 4. That is, the vibration speaker 2 is inserted into the holding part 20 of the attachment device 4 from the opening 22, so that the flange part 11 and the vibration transmission part 7 of the main body part 6 of the vibration speaker 2 are sandwiched and held from above and below, and the outer periphery above the flange part 11 of the main body part 6 (case 10) is held by the hook part 27 in the notch part 26, so that the vibration speaker 2 is easily attached to the holding part 20. In this state, the vibration transmission part 7 of the vibration speaker 2 held by the holding part 20 comes into contact with the lower restricting part 23. Also, the terminal part 12 of the vibration speaker 2 is exposed from the notch part 26.

[0037] Next, the mounting device 4 holding the vibration speaker 2 is attached to the vibrated member 3. In this embodiment, in order to use the air outlets 14 as sound output ports in the vibrated member 3, the vibration speaker 2 is attached via the mounting device 4 to the intermediate portions of the air outlets 14, 14 that are equidistant or approximately equidistant from the air outlets 14, 14 for each member main body portion 18, that is, the intermediate portion in the longitudinal direction of the first portion 16.

[0038] The mounting device 4, for example, overlaps the mounting portion 30 on a support portion 37 protruding from the vibrated member 3, and fixes the mounting portion 30 integrally to the support portion 37 by pressing the fixing member 32 from above, i.e., from the outside of the vibrated member 3, into the hole portions 33 of each mounting portion 30 and the hole portions 38 formed in the support portion 37.

[0039] In this state, the convex portion 28 protruding from the lower portion of the holding portion 20 located between the mounting portions 30, 30 is in a position where it strongly interferes with the mounting surface 39 between the support portions 37, 37 of the vibrated member 3, so that the convex portion 28 is held in a state of being pressed against the mounting surface 39 of the vibrated member 3 by the bias caused by the bending of the adjustment portion 35 and / or the elastic deformation of the mounting surface 39 of the vibrated member 3. Note that the elastic deformation of the mounting surface 39 in FIG. 1 is exaggerated.

[0040] When an electrical signal is input to the vibration speaker 2, the voice coil vibrates in response to the electrical signal, and the vibration is transmitted via the vibration transmission section 7 from the regulating section 23 on the lower side of the mounting device 4 through the convex section 28 to the mounting surface 39 of the vibrated member 3. As a result, the entire vibrated member 3 vibrates as a diaphragm, causing the air in the ventilation passage inside the vibrated member 3 to vibrate, and sound is output into the vehicle cabin through the air outlet 14.

[0041] In this way, according to the first embodiment, by adjusting the contact force between the holding portion 20 and the vibrated member 3 using the adjustment portion 35 when the holding portion 20, which holds the vibration speaker 2 in contact with the vibration transmission portion 7, is attached to the vibrated member 3 using the mounting portion 30, the tolerance range for variations in the dimensional accuracy and mounting position of the vibrated member 3, for example, is expanded, and the holding portion 20 can be brought into stable contact with the vibrated member 3 even against vibrations when the vehicle is traveling and temperature changes in the installed portion, etc., thereby improving reliability while improving the sound quality produced by the vibration of the vibrated member 3 through reliable transmission of vibrations.

[0042] Since the adjustment portion 35 is an elastic portion that elastically presses the holding portion 20 against the vibrated member 3 in the direction of attachment of the holding portion 20 to the vibrated member 3 by the mounting portion 30, even if the vibrated member 3 that is to come into contact with the holding portion 20 is, for example, hard, the pressure of the adjustment portion 35 can reliably press the holding portion 20 against the vibrated member 3.

[0043] By providing a convex portion 28 on the holding portion 20 for contacting the vibrated member 3 protruding in the direction of mounting the holding portion 20 to the vibrated member 3 by the mounting portion 30, the holding portion 20 can be reliably and stably pressed against the vibrated member 3 via the convex portion 28 by pressing the adjustment portion 35.

[0044] In particular, when the contact area between the holding part 20 and the vibrated member 3 is large, the contact between the holding part 20 and the vibrated member 3 becomes unstable due to the influence of rattle and dimensional variation in the mounting direction of the mounting part 30, the dimensional accuracy of the vibrated member 3, etc., whereas by making the convex parts 28 dot-like, the contact area between the holding part 20 and the vibrated member 3 can be made smaller, and the holding part 20 can be more stably pressed against the vibrated member 3 compared to when the contact area is large. Note that, since it is sufficient that the vibration of the vibration transmission part 7 of the vibration speaker 2 is transmitted reliably and stably to the vibrated member 3, the size of the contact area between the holding part 20 and the vibrated member 3 is unrelated to the volume of the sound generated by the sound generator 1.

[0045] The regulating portion 23, which regulates the position of the vibration speaker 2, defines an opening 22 into which the vibration speaker 2 is inserted at least in a direction intersecting the protruding direction of the convex portion 28, so that the vibration speaker 2 can be easily attached and held in the holding portion 20 by inserting the vibration speaker 2 into the holding portion 20 through the opening 22.

[0046] Furthermore, the above-mentioned mounting device 4 is used to mount the vibration speaker 2 having the vibration transmission part 7 to the vibrated member 3 to form the sound generator 1, so that the vibration of the vibration transmission part 7 of the vibration speaker 2 can be reliably transmitted to the vibrated member 3 via the mounting device 4, providing the sound generator 1 that can produce a stable, loud sound.

[0047] In particular, by using the vibrated member 3 as a duct part of an air conditioner for a vehicle, an air conditioner that also functions as a speaker for outputting sound can be provided. This makes it possible to reduce door speakers in the vehicle, for example, and improves the layout of the entire vehicle, reduces weight, and improves power consumption. Moreover, the air outlet 14, which serves as the sound outlet, is located close to the face of the occupant, so that sound can be heard from a position close to the height of the occupant's ears, which also contributes to improving the so-called user experience of the occupant.

[0048] The protrusions 28 are not limited to those that contact the mounting surface 39 of the vibrated member 3 in a point-like manner, and may be formed in a line on the lower restricting portion 23 and contact the vibrated member 3 in a line, as in the second embodiment shown in FIG. 5. In the illustrated example, the protrusions 28 are formed in a straight line or rib shape. For example, the protrusions 28 are formed in a straight line along the insertion direction of the vibration speaker 2 from the opening 22 into the holding portion 20. Even with this configuration, it is possible to achieve the same effects as the first embodiment, such as improving the sound quality generated by the vibration of the vibrated member 3 while improving reliability.

[0049] In each embodiment, the vibrated member 3 is not limited to a duct portion of an air conditioner for a vehicle, and any other object that can function as a diaphragm may be used. [Industrial Applicability]

[0050] The present invention can be suitably used, for example, as a mounting device for mounting a vibration speaker to a duct portion of an air conditioning system for a vehicle, and as an acoustic generator that also serves as the duct portion of an air conditioning system to which a vibration speaker is mounted by the mounting device. [Explanation of symbols]

[0051] 1 Sound Generator 2 Vibration Speaker 3 Vibrated member 4 Mounting device 7 Vibration transmission section 20 Holding part 22 Opening 23 Regulatory Department 28 Convex 30 Mounting part 35 Adjustment part

Claims

1. A vibration speaker mounting device for mounting a vibration speaker having a vibration transmitting section to a vibrated member, comprising: a holder for holding the vibration speaker in contact with the vibration transmission unit; a mounting portion for mounting the holding portion to the vibrated member; an adjustment section that adjusts a contact force between the holding section and the vibrated member when the holding section is attached to the vibrated member by the attachment section; A mounting device for a vibration speaker comprising:

2. The adjustment portion is an elastic portion that elastically presses the holding portion against the vibrated member in a direction in which the holding portion is attached to the vibrated member by the attachment portion.

2. The mounting device for a vibration speaker according to claim 1.

3. The holding portion has a protrusion for contacting the vibrated member, The protrusion is provided to protrude in a direction in which the holder is attached to the vibrated member by an attachment portion.

3. The mounting device for a vibration speaker according to claim 2.

4. The holding portion has a restricting portion that restricts the position of the vibration speaker, The restricting portion defines an opening into which the vibration speaker is inserted at least in a direction intersecting a protruding direction of the convex portion.

2. The mounting device for a vibration speaker according to claim 1.

5. A vibration speaker having a vibration transmission unit; A vibrated member; a mounting device for mounting the vibration speaker to the vibrated member according to any one of claims 1 to 4; An acoustic generator comprising:

6. The vibrated member is a duct portion of an air conditioning device for a vehicle that blows out conditioned air.

6. The acoustic generator according to claim 5.

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