Speaker equipment

Abstract

To provide a speaker device capable of improving the accuracy of the yoke mounting position.SOLUTION: A speaker device 100 includes: a magnetic circuit 110 that has a york 111, a magnet 112, and a top plate 113; a voice coil body 120; a diaphragm 130; and a foundation member 140 that holds the yoke 111 and the diaphragm 130. The foundation member 140 includes a through-hole 145 provided to hold the yoke 111 in place when inserted, and the yoke 111 includes a protrusion 116 that abuts the outer peripheral surface portion 147 of the through-hole 145 with the magnetic gap 119 located inside the foundation member 140.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a speaker device that converts an electrical signal into sound. [Background technology]

[0002] Conventionally, as in the speaker device described in Patent Document 1, there is a yoke that is a cylindrical yoke with a bottom that constitutes a magnetic circuit and has a protrusion that protrudes outward from an open end of the yoke. The yoke is fixed to a base member called a frame or the like by engaging the protrusion with an engagement portion provided on the base member. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-186517 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in a conventional speaker device, a slight misalignment may occur between the central axis of the yoke and the central axis of the base member during assembly, which may adversely affect the sound pressure frequency characteristics of the speaker device.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a speaker device in which the positional relationship between a base member and a yoke during assembly can be easily determined. [Means for solving the problem]

[0006] In order to achieve the above-mentioned object, one aspect of the present invention provides a speaker device comprising: a magnetic circuit having a cylindrical yoke with a bottom, a magnet, and a top plate; a voice coil body having one end inserted into a magnetic gap between the yoke and the top plate; a diaphragm connected to the other end of the voice coil body; and a base member that holds the yoke and the diaphragm, wherein the base member has a through hole that holds the yoke in a predetermined position in the inserted state, and the yoke has a protrusion that abuts against the outer peripheral portion of the through hole when the magnetic gap is positioned inside the base member. Effect of the Invention

[0007] According to the present invention, by inserting the yoke into the through hole of the base member, the positional relationship between the central axis of the yoke and the central axis of the base member can be accurately determined, and the desired sound pressure frequency characteristic of the speaker device can be maintained. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view showing an external appearance of a speaker device in the present embodiment, as viewed from the front. [Diagram 2] 1 is a perspective view showing the appearance of a speaker device in the present embodiment from the back side. [Diagram 3] 1 is a cross-sectional view showing a speaker device in an embodiment of the present invention. [Figure 4] FIG. 2 is an exploded perspective view showing a magnetic circuit taken out from a base member in the embodiment. [Diagram 5] FIG. 11 is a cross-sectional view showing a speaker device according to another embodiment. 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 for explaining 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 not described below. In addition, geometric expressions such as parallel and orthogonal may be used, but these expressions do not indicate mathematical strictness, and include substantially permissible errors, deviations, and the like. In addition, expressions such as simultaneous and identical also include substantially permissible ranges.

[0010] Furthermore, 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 may differ 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 the speaker device in this embodiment from the front. Fig. 2 is a perspective view showing the appearance of the speaker device in this embodiment from the back. Fig. 3 is a cross-sectional view showing the speaker device in this embodiment. As shown in these figures, the speaker device 100 is an electro-acoustic transducer that converts an electric signal into sound, and includes a magnetic circuit 110, a voice coil body 120, a diaphragm 130, and a base member 140.

[0013] Magnetic circuit 110 is a circuit that generates a steady magnetic field in magnetic gap 119 (see FIG. 3). In this embodiment, magnetic circuit 110 is an internal magnet type, and includes a cylindrical yoke 111 with a bottom, a disk-shaped magnet 112 housed in yoke 111, and a disk-shaped top plate 113 that is attached to the end face of magnet 112 on the opposite side of yoke 111 and forms magnetic gap 119 between it and yoke 111.

[0014] The voice coil body 120 includes a voice coil 121 that generates a magnetic field in response to an input signal, and a cylindrical bobbin 122 around which the voice coil 121 is wound. A diaphragm 130 is attached to the outer periphery of the tip end of the bobbin 122 of the voice coil body 120, and the voice coil 121 is disposed at the base end of the bobbin 122. A cap 123 that closes the opening of the bobbin 122 is attached to the tip of the bobbin 122. The voice coil 121 is disposed in a state where the voice coil 121 is inserted in annular magnetic gap 119 formed by the magnetic circuit 110.

[0015] Diaphragm 130 is a membrane-like member that vibrates and generates sound due to the reciprocating motion of voice coil body 120 in the winding axis direction. The shape (structure) of diaphragm 130 is not particularly limited, but in this embodiment, diaphragm 130 is in a truncated cone shape (a cone shape with the top portion cut off). Also, diaphragm 130 has edge 131 that bulges out in an annular shape on its outer periphery. A through hole is provided in the center of diaphragm 130, and voice coil body 120 is pierced through the hole, and diaphragm 130 is attached to the outer periphery of bobbin 122 by adhesive.

[0016] In the present embodiment, the entire circumference of the outer periphery of diaphragm 130 is attached to first annular portion 141 of base member 140 by adhesive. In addition, the entire circumference of the outer periphery of diaphragm 130 is attached in a state of being sandwiched between first annular portion 141 and clamping member 150, thereby improving the attachment strength. Clamping member 150 is an annular member having mechanical strength equivalent to that of base member 140.

[0017] The base member 140 is a member called a frame that serves as a structural foundation of the speaker device 100, and holds at least the yoke 111 of the magnetic circuit 110 and the diaphragm 130. The shape of the base member 140 is not particularly limited, but in the present embodiment, the base member 140 includes a hollow shallow truncated cone-shaped through-hole portion 143 that supports the magnetic circuit 110 in a pierced state, a first annular portion 141 that is annular and directly connected to the outer periphery of the diaphragm 130 by adhesion, and a columnar connecting portion 144 that connects the through-hole portion 143 and the first annular portion 141. A plurality of connecting portions 144 are arranged side by side on a circumference centered on the winding axis of the voice coil body 120.

[0018] The material of base member 140 is not particularly limited, but in the present embodiment, base member 140 is made of resin, and through-hole portion 143, first annular portion 141, and connecting portion 144 are molded integrally.

[0019] Damper 160 (see FIG. 3) is a member that connects base member 140 and voice coil body 120 and supports the reciprocating motion of voice coil body 120 in the tube axis direction. In the case of this embodiment, damper 160 is a thin, annular member curved in a ripple shape, with its inner periphery attached to the middle part of voice coil body 120 and its outer periphery attached to the middle part of base member 140. Note that there is a case where speaker device 100 does not include damper 160.

[0020] FIG. 4 is an exploded perspective view showing the magnetic circuit taken out from the base member. At the top of the through-hole portion 143 of the base member 140, a through-hole 145 is provided to hold the yoke 111 in a predetermined position in an inserted state. The through-hole 145 is provided in the through-hole portion 143 so that the tube axis coincides with the winding axis of the voice coil body 120. An outer peripheral surface portion 147 (see FIG. 3), which is the outer end face of the part of the base member 140 forming the through-hole 145, is arranged in a plane perpendicular to the winding axis of the voice coil body 120. The base member 140 has an annular extension portion 148 (see FIG. 3) that extends inwardly in a protruding manner on the opposite side of the outer peripheral surface portion 147 in the tube axis direction of the through-hole 145. This makes it possible to increase the length of the through-hole 145 while reducing the thickness of the through-hole portion 143, and effectively suppress the inclination of the through-hole 145 of the yoke 111 inserted into the through-hole 145 with respect to the tube axis.

[0021] The yoke 111 that constitutes the magnetic circuit 110 has a protrusion 116 that abuts against the outer peripheral surface 147 of the cylindrical through hole 145 when the magnetic gap 119 is positioned inside the base member 140, that is, when the top plate 113, which is the counterpart that forms the magnetic gap 119, is accommodated inside the through hole portion 143 of the base member 140, and an insertion portion 117 that is inserted into the through hole 145.

[0022] The shape of protrusion 116 is not particularly limited, and may be a protrusion protruding in a radial direction, a ring-shaped flange, etc. In the case of this embodiment, protrusion 116 includes flange portion 114 protruding in a ring shape from the outer circumferential surface of the yoke, and engagement protrusion 115 protruding in a radial direction from the outer circumferential surface of flange portion 114. The surfaces of flange portion 114 and engagement protrusion 115 facing base member 140 are flush with each other, and are disposed in a plane perpendicular to the tube axis of yoke 111.

[0023] The relationship between the hole diameter of the through hole 145 and the diameter of the outer circumferential surface of the insertion part 117 of the yoke 111 is preferably such that the gap does not adversely affect the sound pressure frequency characteristic of the speaker device 100. Note that the relationship may be an interference fit in which the insertion part 117 of the yoke 111 is press-fitted into the through hole 145.

[0024] In this embodiment, the base member 140 has an engagement portion 146 in the vicinity of the outer peripheral surface portion 147, which engages with the engagement protrusion 115 of the protrusion 116 to structurally fix the yoke 111 to the base member 140. The engagement relationship between the engagement protrusion 115 of the protrusion 116 and the engagement portion 146 is not particularly limited. In this embodiment, the engagement portion 146 is disposed opposite the outer peripheral surface portion 147 at a distance that allows the engagement protrusion 115 to be inserted between the engagement portion 146 and the outer peripheral surface portion 147. The base member 140 also has an insertion portion 149 that allows the engagement protrusion 115 to pass when the yoke 111 is inserted into the through hole 145, and the gap between the engagement portion 146 and the outer peripheral surface portion 147 communicates with the insertion portion 149. With the above-described engagement structure, yoke 111 is inserted into through-hole 145 in a position that allows engagement protrusion 115 to be inserted into insertion portion 149, and when protrusion 116 abuts against outer circumferential surface portion 147, yoke 111 is rotated so that engagement protrusion 115 is inserted into the gap between engagement portion 146 and outer circumferential surface portion 147, whereby engagement protrusion 115 engages with engagement portion 146 and yoke 111 is fixed to base member 140. In order to increase the bonding strength between yoke 111 and base member 140, in this embodiment, yoke 111 and base member 140 are bonded together using an adhesive.

[0025] As described above, according to the speaker device 100 of the present embodiment, the positional relationship between the yoke 111 and the base member 140 is determined not by the engagement between the engagement portion 146 and the engagement protrusion 115, but by bringing the inner peripheral surface of the through hole 145 provided in the base member 140 and the outer peripheral surface of the insertion portion 117 of the yoke 111 into contact with each other over the entire circumference in the tube axis direction, so that the misalignment of the central axes of the yoke 111 and the base member 140 can be suppressed during assembly of the speaker device 100, and the inclination between the central axis of the base member 140 and the tube axis of the yoke 111 can be suppressed. Also, high alignment accuracy can be achieved in assembling a plurality of speaker devices 100, and the quality can be stabilized.

[0026] Also, by lengthening insertion portion 117 of yoke 111 and locating magnetic gap 119 inside the main body of base member 140 (part other than extension portion 148), and adopting a structure in which magnetic gap 119 is not covered by the main body of base member 140, it is possible to improve the efficiency of dissipating heat generated by voice coil 121. Note that although extension portion 148 covers a part of magnetic gap 119, extension portion 148 is a thin annular portion that protrudes inward from the main body of base member 140, and therefore its effect on heat dissipation efficiency is limited.

[0027] 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.

[0028] For example, the base member 140 may not include the engagement portion 146 for structurally fixing the yoke 111, and the yoke 111 may be fixed to the base member 140 by adhesive.

[0029] In addition, the protrusion 116 may be engaged with the engagement portion 146 not only by rotating the yoke 111 relative to the base member 140 but also by pushing the yoke 111 into the base member 140. As a specific example, as shown in FIG. 5, the engagement portion 146 has a tapered surface that comes into contact with the protrusion 116 when the yoke 111 is inserted into the through hole 145. The protrusion 116 is in the shape of a ring flange that does not have an engagement protrusion 115. With this structure, when the yoke 111 is inserted into the through hole 145, the tapered surface receives a pressing force from the protrusion 116, and the engagement portion 146 bends to the outside, allowing the protrusion 116 to pass through. When the protrusion 116 passes through, the engagement portion 146 returns to its original position and the protrusion 116 and the engagement portion 146 engage with each other. In this manner, the yoke 111 is structurally fixed to the base member 140.

[0030] Moreover, the speaker device 100 may be a so-called coaxial type speaker device having a second speaker device in charge of the treble range in front of the diaphragm 130.

[0031] Furthermore, a physical equalizer such as a resonator may be provided in front of the diaphragm 130 .

[0032] The speaker device 100 may have a cabinet, and may be attached to the housing of an electronic device such as a television or a computer, or to the structure of a moving body such as a car or an airplane. The speaker device 100 may be attached to a housing constituting a headphone or an inner earphone. [Industrial Applicability]

[0033] The present invention can be applied to a speaker device that reproduces audio signals such as music as sound. [Explanation of symbols]

[0034] 100 Speaker equipment 110 Magnetic Circuit 111 York 112 Magnet 113 Top Plate 114 Flange part 115 Engagement protrusion 116 Protrusion 117 Insertion section 119 Magnetic Gap 120 Voice coil body 121 Voice coil 122 Bobbin 123 Cap 130 Diaphragm 131 Edge 140 Foundation members 141 First Circular Section 143 Through hole 144 Connection 145 Through hole 146 Engagement part 147 Lateral facial area 148 Yanzai Department 149 Insertion Department 150 Clamping parts 160 ダンパー

Claims

1. a magnetic circuit including a cylindrical yoke with a bottom, a magnet, and a top plate; a voice coil body having one end inserted into a magnetic gap between the yoke and the top plate; a diaphragm connected to the other end of the voice coil body; a base member for holding the yoke and the diaphragm, The base member is a through hole for holding the yoke in a predetermined position in an inserted state; an annular extending portion that extends inwardly and protrudes from an opposite side of the outer peripheral surface portion in the tube axis direction of the through hole; an engagement portion in the vicinity of the outer peripheral surface portion for abutting the yoke against a base member, The yoke is a protrusion that comes into contact with an outer peripheral surface of the through hole when the magnetic gap is disposed inside the base member; An insertion portion that is inserted into the through hole, The protrusion is a flange portion that protrudes in an annular shape from an outer peripheral surface of the yoke and is disposed in a plane perpendicular to a tube axis of the yoke; an engagement protrusion protruding in a radial direction from an outer circumferential surface of the flange portion, The speaker device has an inner surface of the through hole provided in the base member and an outer surface of the insertion portion of the yoke abutted around the entire circumference in the tube axis direction, an engaging portion of the base member abuts against a flange portion of the protruding portion of the yoke, and the engaging protrusions are engaged to fix the base member and the yoke.

2. The yoke is held by the base member in a state where it protrudes inward from the base member. The speaker device according to claim 1 .

3. The protruding portion of the yoke is disposed at a position closer to the center than the end surface of the yoke in the tube axis direction of the yoke. Located in the center 3. The speaker device according to claim 1 or 2.

4. The base member is an insertion portion that allows passage of the engagement protrusion when the yoke is inserted into the through hole; The yoke is rotated so that the engagement protrusion is inserted into the gap between the engagement portion and the outer peripheral surface portion, and the engagement protrusion is engaged with the engagement portion. The speaker device according to claim 1 .

5. a magnetic circuit including a cylindrical yoke with a bottom, a magnet, and a top plate; a voice coil body having one end inserted into a magnetic gap between the yoke and the top plate; a diaphragm connected to the other end of the voice coil body; a base member for holding the yoke and the diaphragm, The base member is a through hole for holding the yoke in a predetermined position in an inserted state; an annular extending portion that extends inwardly and protrudes from an opposite side of the outer peripheral surface portion in the tube axis direction of the through hole; an engagement portion for abutting the yoke against a base member near the outer peripheral surface portion, and a tapered surface that bends outward; The yoke is an insertion portion that is inserted into the through hole with the magnetic gap disposed inside the base member; a protrusion disposed in a plane perpendicular to the tube axis of the yoke and protruding radially from an outer circumferential surface, The inner peripheral surface of the through hole provided in the base member and the outer peripheral surface of the insertion portion of the yoke are brought into contact with each other over the entire circumference in the tube axis direction, and the engaging portion of the base member and the protruding portion of the yoke are engaged with each other. When the yoke is inserted into the through hole, the yoke is pushed into the base member, whereby the protruding portion and the engaging portion are engaged with each other, thereby fixing the base member and the yoke. Speaker equipment.

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