Speaker equipment

Abstract

To provide a speaker device capable of reducing the weight of a coaxial speaker unit.SOLUTION: A speaker device 100 includes; a first speaker unit 101 that has a first magnetic circuit 118 and a first diaphragm 112; and a second speaker unit 102 that is placed at the sound emitting side of the first speaker unit 101 and includes a second magnetic circuit 128 and a second diaphragm 122. The second speaker unit 102 includes a support member 124 having a roughly cylindrical shape, which is fixed to the first magnetic circuit 118, and supports the second magnetic circuit 128 inside thereof so that the entire circumference of the outer peripheral portion of the second diaphragm 122 is connected to an end surface of the support member.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a speaker device, and more particularly to a speaker device in which a second speaker unit is disposed in front of a first speaker unit. [Background technology]

[0002] Conventionally, there exists a so-called coaxial speaker device in which a pair of speaker units are arranged on the same axis. As a specific structure of such a speaker device, a structure has been proposed in which a support member is fixed to a magnetic circuit of the speaker device on the rear side and supports a magnetic circuit of the speaker device on the front side (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-033593 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, nowadays, there are cases where speaker devices are attached to moving objects such as vehicles or portable devices, and so there is a demand for lighter speaker devices.

[0005] The present invention is based on findings obtained as a result of the inventor's intensive experiments and research into the above-mentioned problems, and has an object to provide a coaxial speaker device that has a simple configuration and can be made lightweight. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, a speaker device of the present invention comprises a first speaker unit having a first magnetic circuit and a first diaphragm, and a second speaker unit arranged on the sound radiation side of the first speaker unit and having a second magnetic circuit and a second diaphragm, wherein the second speaker unit comprises a substantially cylindrical support member fixed to the first magnetic circuit, supports the second magnetic circuit from the inside, and has an end face connected to the entire circumference of the outer periphery of the second diaphragm. Effect of the Invention

[0007] According to the present invention, it is possible to reduce the number of parts and to make the speaker device lighter. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing the appearance of a speaker device according to the present embodiment. [Diagram 2] FIG. 2 is a cross-sectional view showing the speaker device in the present embodiment. [Diagram 3] FIG. 3 is a perspective view showing a support member in the present embodiment. [Figure 4] FIG. 4 is a cross-sectional view of the support member taken along the line AA shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of a speaker device according to the present invention will be described with reference to the drawings. Note that the following embodiment is an example given to explain the present invention, and is not intended to limit the present invention. For example, the shapes, structures, materials, components, relative positional relationships, connection states, numerical values, mathematical expressions, contents of each step in the method, and the order of each step shown in the following embodiment are examples, and may include contents that are not described below. Also, while geometric expressions such as parallel and orthogonal may be used, these expressions are not necessarily strictly mathematical. The term "simultaneous" does not indicate the degree of accuracy, but includes a substantially acceptable range of error, deviation, etc. Furthermore, expressions such as "simultaneous" and "identical" also include a substantially acceptable range of error, deviation, etc.

[0010] In addition, the drawings are schematic diagrams in which emphasis, omissions, or ratios have been appropriately adjusted in order to explain the present invention, and the shapes, positional relationships, and ratios are different from the actual ones.

[0011] In addition, in the following, a plurality of inventions may be collectively described as one embodiment, and some of the contents described below are described as optional components related to the present invention.

[0012] Fig. 1 is a perspective view showing the appearance of a speaker device in this embodiment. Fig. 2 is a cross-sectional view showing the speaker device in this embodiment. As shown in these figures, the speaker device 100 is a speaker in which two speaker units are arranged side by side in the front-rear direction (Z-axis direction in the figures), and includes a first speaker unit 101 and a second speaker unit 102.

[0013] The first speaker unit 101 is a speaker that is larger than the second speaker unit 102 and is designed to radiate low-frequency sounds, and includes a first diaphragm 112, a first voice coil body 113, a base member 114, a first magnetic circuit 118, a clamping member 160, and a first damper 151.

[0014] The first diaphragm 112 is a membrane-like member that vibrates and generates sound due to the reciprocating motion of the first voice coil body 113 in the winding axis direction. The shape (structure) of the first diaphragm 112 is not particularly limited, but in this embodiment, the first diaphragm 112 is in the shape of a truncated cone (a cone shape with the top portion cut off). The outer periphery of the first diaphragm 112 is provided with an annularly bulging edge. A through hole is provided in the center of the first diaphragm 112, and the first voice coil body 113 is attached by adhesive in a pierced state. The entire circumference of the outer periphery of the first diaphragm 112 is attached to the base member 114 by adhesive.

[0015] The first voice coil body 113 includes a first voice coil 131 that generates a magnetic field in response to an input signal, and a cylindrical first bobbin 132 around which the first voice coil 131 is wound. The first diaphragm 112 is attached to the outer periphery of the tip end of the first bobbin 132 of the first voice coil body 113, and the first voice coil 131 is disposed on the base end of the first bobbin 132. The first voice coil 131 is disposed in an inserted state in the annular magnetic gap of the first magnetic circuit 118.

[0016] The base member 114 is a member that serves as a structural foundation of the speaker device 100. The shape of the base member 114 is not particularly limited, but in the case of the present embodiment, the base member 114 includes a container portion 141 that supports the first magnetic circuit 118 in a housed state, a circular first annular portion 142 to which the outer periphery of the first diaphragm 112 is directly connected by adhesion, and a columnar connecting portion 143 that connects the container portion 141 and the first annular portion 142. A plurality of connecting portions 143 are arranged side by side on a circumference centered on the winding axis of the first voice coil body 113.

[0017] The material of base member 114 is not particularly limited, but in the present embodiment, base member 114 is made of resin, and container portion 141, first annular portion 142, and connecting portion 143 are molded integrally.

[0018] The first magnetic circuit 118 is a circuit that generates a steady magnetic field in the magnetic gap. The first magnetic circuit 118 may be either an internal magnetic type or an external magnetic type. In the present embodiment, the first magnetic circuit 118 is an internal magnetic type, and includes a cylindrical first yoke 115 with a bottom, a disk-shaped first magnet 116 housed in the first yoke 115, and a first magnet 116 on the opposite side of the first yoke 115. and a disk-shaped first top plate 117 attached to an end surface of the first yoke 115 to form a magnetic gap between the first top plate 117 and the first yoke 115.

[0019] An insertion hole 119 is provided in the center of first top plate 117 into which a protrusion 129 that is part of a support member 124 (described in detail later) is inserted, allowing the support member 124 to be aligned with the first magnetic circuit 118.

[0020] The clamping member 160 includes a second annular portion 162 that clamps and holds the outer periphery of the first diaphragm 112 over the entire circumference between the clamping member 160 and the first annular portion 142 of the base member 114. The clamping member 160 also includes a third annular portion 163 that clamps and holds the outer periphery of the second diaphragm 122 over the entire circumference between the clamping member 160 and an end face of a support member 124 described below. The second annular portion 162 is concentrically disposed outside the third annular portion 163, and the second annular portion 162 and the third annular portion 163 are connected by rod-shaped bridge portions 161 that are radially disposed.

[0021] In the present embodiment, the second annular portion 162 has a horn shape, and the directivity of the sound emitted from the second speaker unit 102 is adjusted.

[0022] First damper 151 is a member that connects base member 114 and first voice coil body 113, and supports the reciprocating motion of first voice coil body 113 in the tube axis direction. In the case of this embodiment, first damper 151 is a thin, annular member curved in a ripple shape, with its inner periphery attached to the middle part of first voice coil body 113 and its outer periphery attached to the middle part of base member 114. Note that there are cases in which first speaker unit 101 does not include first damper 151.

[0023] The second speaker unit 102 is a speaker that is disposed on the sound emission side (Z+ side in the figure) of the first speaker unit 101, and emits sound in the same direction as the first speaker unit 101. The second speaker unit 102 is a speaker that is smaller than the first speaker unit 101, and is a speaker designed to emit sounds in a higher frequency range than the first speaker unit 101. Like the first speaker unit 101, the second speaker unit 102 also includes a second diaphragm 122, a second voice coil body 123, a support member 124, and a second magnetic circuit 128.

[0024] The second diaphragm 122 is a membrane-like member that vibrates and generates sound due to the reciprocating motion of the second voice coil body 123 in the winding axis direction. The shape (structure) of the second diaphragm 122 is not particularly limited, but in this embodiment, the second diaphragm 122 is dome-shaped. The outer periphery of the second diaphragm 122 is provided with an annularly bulging edge. The entire periphery of the outer periphery of the second diaphragm 122 is attached to the end face of the support member 124 by adhesive.

[0025] The second voice coil body 123 includes a second voice coil 134 that generates a magnetic field in response to an input signal, and a cylindrical second bobbin 135 around which the second voice coil 134 is wound. The second diaphragm 122 is attached to the outer periphery of the tip end of the second bobbin 135 of the first voice coil body 113, and the second voice coil 134 is disposed on the base end of the second bobbin 135. The second voice coil 134 is disposed in an inserted state in the annular magnetic gap of the second magnetic circuit 128.

[0026] In the present embodiment, the winding axis of the second voice coil 134 of the second speaker unit 102 is arranged coaxially with the winding axis of the first voice coil 131 of the first speaker unit 101, and the second speaker unit 102 is arranged in front of the first diaphragm 112 of the first speaker unit 101 (Z+ side in the figure) so as to radiate sound in the same direction as the first speaker unit 101. In other words, the speaker device 100 is a so-called coaxial speaker. It is a speaker device.

[0027] FIG. 3 is a perspective view showing the support member. FIG. 4 is a cross-sectional view of the support member taken along line AA in FIG. 3. The support member 124 is a cylindrical member whose bottom side is fixed to the first top plate 117 of the first magnetic circuit 118. The support member 124 supports the second magnetic circuit 128 in a state in which the second magnetic circuit 128 is accommodated inside, and the entire circumference of the outer periphery of the second diaphragm 122 is connected to the end face. In the case of this embodiment, the support member supports the second magnetic circuit 128 so that the second magnetic circuit 128 is disposed inside the cone-shaped first diaphragm 112 of the first speaker unit 101, that is, so that the second magnetic circuit 128 is positioned behind the edge of the first diaphragm 112 in the front-rear direction (the Z-axis direction in the figure).

[0028] In the present embodiment, the support member 124 is cylindrical with a bottom, and is provided with a cylindrical protrusion 129 protruding outward from the center of the bottom. The protrusion 129 is inserted into an insertion hole 119 provided in the first top plate 117 of the first magnetic circuit 118, thereby enabling the second speaker unit 102 to be aligned with the first speaker unit 101. A flange portion 136 protruding outward is provided at the tip of the support member 124. This allows the contact area with the outer periphery of the second diaphragm 122 to be increased while the entire support member 124 is made thinner, thereby achieving both a reduction in weight of the support member 124 and an improvement in the adhesive strength between the support member 124 and the second diaphragm 122.

[0029] The outer circumferential surface of support member 124 is set to be parallel to the inner circumferential surface of cylindrical first voice coil body 113. In other words, the space sandwiched between support member 124 and first voice coil body 113 is set to have the same area from an opening corresponding to the tip (Z+ side end in the figure) of first voice coil body 113 to the bottom of support member 124. This makes it possible to suppress resonance due to the space between support member 124 and first voice coil body 113, and to prevent deterioration of the frequency characteristics of speaker device 100.

[0030] Furthermore, the support member 124 has grooves 137 at multiple locations that are recessed from the outer circumferential surface toward the inside and extend in the tube axis direction of the support member 124. This makes it possible to reduce the weight of the support member 124 and to effectively cool the heat generated from the first voice coil body 113. The width of the grooves 137 is not particularly limited, but is preferably set to a width that can suppress resonance (Helmholtz resonance).

[0031] 3 and 4, the support member 124 has protrusions 138 at locations corresponding to the grooves 137, the protrusions 138 protruding inward from the inner peripheral surface on the back side of the grooves 137 and extending in the axial direction of the support member 124. The upper end faces (the Z+ side end faces in the figures) of the protrusions 138 are arranged in the same plane, and the second magnetic circuit 128 is supported by the support member 124 in a state of contact with each upper end face. By providing the protrusions 138 wider than the grooves 137 on the back side of the grooves 137, the thickness of the peripheral wall of the support member 124 can be made thinner, and the support member 124 can be made lighter.

[0032] The second magnetic circuit 128 is a circuit that generates a steady magnetic field in the magnetic gap. The second magnetic circuit 128 may be either an internal magnetic type or an external magnetic type, but in the present embodiment, the second magnetic circuit 128 is an internal magnetic type like the first magnetic circuit 118, and includes a bottomed cylindrical second yoke 125, a disk-shaped second magnet 126 housed in the second yoke 125, and a disk-shaped second top plate 127 attached to the end face of the second magnet 126 on the opposite side of the second yoke 125 and forming a magnetic gap between the second yoke 125 and the second yoke 125.

[0033] The second magnetic circuit 128 and the first magnetic circuit 118 may be of different types, for example, the second magnetic circuit 128 may be of an external magnet type and the first magnetic circuit 118 may be of an internal magnet type.

[0034] As described above, according to the speaker device 100 of the present embodiment, the function as a frame for the second speaker unit 102 and the function as a member for arranging the second speaker unit 102 at a predetermined position relative to the first speaker unit 101 are realized by the integrated support member 124, so that it is possible to reduce the number of parts constituting the speaker device 100 and to achieve weight reduction. In addition, since the structure is simplified, it is possible to improve the structural strength of the speaker device 100 and realize the speaker device 100 that is resistant to vibration, impact, and the like.

[0035] Moreover, at the front side (Z+ side in the drawing) of the speaker device 100, the clamping member 160 connects the base member 114 and the support member 124 in a bridging manner, and at the rear side (Z- side in the drawing) of the speaker device 100, the support member 124 is fixed to the base member 114 via the first magnetic circuit 118. With this structure, the structural strength of the speaker device 100 can be further increased.

[0036] The present invention is not limited to the above-described embodiment. For example, the components described in this specification may be combined in any manner, or some of the components may be removed to create another embodiment of the present invention. In addition, the present invention also includes modifications that are made to the above-described embodiment by those skilled in the art without departing from the spirit of the present invention, i.e., the meaning of the words in the claims.

[0037] For example, the speaker device 100 may include a physical equalizer such as a resonator in front of the second diaphragm 122 of the second speaker unit 102 .

[0038] Furthermore, the speaker device 100 may have an independent cabinet, or may be attached to the housing of an electronic device such as a television or a computer, or to the structure of a moving object such as a car or an aircraft. [Industrial Applicability]

[0039] The present invention can be applied to a speaker device that reproduces audio signals such as music. [Explanation of symbols]

[0040] 100 Speaker equipment 101 First speaker unit 102 Second speaker unit 112 First diaphragm 113 First voice coil body 114 Foundation members 115 First York 116 First Magnet 117 First Top Plate 118 First magnetic circuit 119 Insertion hole 122 Second diaphragm 123 Second voice coil body 124 Support member 125 Second York 126 Second Magnet 127 Second Top Plate 128 Second magnetic circuit 129 Protrusion 131 First voice coil 132 First Bobbin 134 Second voice coil 135 Second Bobbin 136 Flange part 137 Groove 138 Protrusion 141 Container section 142 First Circular Section 143 Connection 151 First Damper 160 Clamping member 161 Crosslinked part 162 Second Circular Section 163 Third Circular Section

Claims

1. a first speaker unit having a first magnetic circuit and a first diaphragm; a second speaker unit disposed on a sound emitting side of the first speaker unit and having a second magnetic circuit and a second diaphragm; The second speaker unit is a support member having a substantially cylindrical shape, the support member being fixed to the first magnetic circuit, supporting the second magnetic circuit from the inside, and having an entire circumference of an outer periphery of the second diaphragm connected to an end surface; The support member is a groove portion recessed inward from an outer circumferential surface and extending in a tube axis direction of the support member; a protruding portion protruding inward from an inner circumferential surface on a back side of the groove portion and extending in a tube axis direction of the support member, The second magnetic circuit is The protruding portion is supported by the support member while being in contact with the end surface of the protruding portion. Speaker equipment.

2. The first speaker unit has a first voice coil assembly, the second speaker unit has a second voice coil assembly, The surfaces of the support member and the first voice coil body facing each other are parallel to each other. The speaker device according to claim 1 .

3. a base member supporting the first magnetic circuit and to which the first diaphragm is directly connected; a sandwiching member sandwiching the first diaphragm between itself and the base member and sandwiching the second diaphragm between itself and the support member; The speaker device according to claim 1 , further comprising:

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