JPH10341498A - Speaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized speaker with excellent low-frequency sound characteristics by using a damper for which elasticity in an axial direction is improved. SOLUTION: The damper 22 is attached to a cylindrical voice coil bobbin 8 and the damper 22 is constituted of a voice coil bobbin attaching plate where a through-hole 23 is formed and plural spring members 20 for freely vibratably supporting the attaching plate. For the spring members 20, wires composed of cloth or thick thread impregnated with thermosetting resin are semicircularly molded. Attaching parts 21a and 21b are formed at both ends, one attaching part 21b is fixed to the frame of this speaker and the other attaching part 21a is fixed to the voice coil bobbin attaching plate. In such a manner, a part distorted in a circumferential direction at the time of large amplitude in the damper is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker in which the elasticity of a damper is improved and the allowable range of the vibration amplitude of a voice coil bobbin is increased.

[0002]

2. Description of the Related Art In recent years, a small and space-saving sound reproducing apparatus has been used, and many speakers used in such a sound reproducing apparatus have a small diameter. FIG. 15 is a cross-sectional view showing a structural example of a conventional small-diameter speaker. A speaker having such a structure will be described below.

In the speaker 1 shown in FIG. 15, a center pole 3, a magnet 4,
An annular magnetic circuit 6 including a top plate 5 is formed. Upper peripheral part of center pole 3 and top plate 5
A high-density magnetic flux is generated in the annular gap 7 formed by the inner peripheral portion of the voice coil bobbin 8 and the voice coil bobbin 8 is held so as to vibrate vertically. The voice coil bobbin 8 is generally a member formed by molding thin paper into a cylindrical shape, and a voice coil 9 is wound around the outer periphery of the lower end.

The voice coil 9 generates an electromagnetic force when a driving current based on an audio signal is applied, and causes the voice coil bobbin 8 to vibrate with a piston. The voice coil 9 is made of a wire material such as aluminum or copper. Reinforcement paper 10 is wound around the outer periphery of the voice coil bobbin 8 except for the lower end portion, thereby securing the rigidity of the voice coil bobbin 8. A diaphragm 11 and a damper (also called a suspension) 12 are fixed to such a voice coil bobbin 8. The diaphragm 11 is attached to the speaker frame 2 via the edge 13 so as to be freely vibrated. The damper 12 is also called a corrugation damper, and its outer peripheral portion is directly attached to the frame 2, and holds the voice coil bobbin 8 so as to be able to vibrate.

In the loudspeaker 1 configured as described above, when a drive current proportional to the audio signal is applied to the voice coil 9, an electromagnetic drive force is generated by the drive current and the magnetic flux in the air gap 7, and the diaphragm 11 12 and edge 13
And vibrates up and down and outputs sound.

[0006]

However, FIG.
In the conventional small loudspeaker 1 shown in FIG. 1, since the aperture of the diaphragm 11 is small, in order to obtain a predetermined sound pressure, the vibration amplitude of the diaphragm 11 must be increased in inverse proportion to the area of the diaphragm. The vibration amplitude must be increased in inverse proportion to the square of the frequency. For this reason, it has been difficult for a small speaker to secure a very large amplitude especially in a low frequency region.

FIG. 16 shows the structure of a conventional damper 12 for supporting a diaphragm. The damper 12 is formed by corrugating resin-impregnated fibers, and has a large number of concentric circular cross sections as shown by the central profile line in the figure.

[0008] As shown in FIG.
The voice coil bobbin 8 vibrating up and down is elastically supported. When the amplitude of the diaphragm 11 is large, the original waveform of the damper shown by the broken line is deformed, and the material of the damper 12 is elongated as shown by the solid line. When stretched, the vertex a of the waveform moves to a '. In order for the vertex a of the waveform to move to a ', the radius r1 of the center circle forming the waveform must increase to r2. The line connecting the vertices of one waveform of the damper is concentric, and does not originally have a mechanism for increasing the radius. Therefore, in order for the radius r1 to change to r2, the material itself of the damper 12 must have elasticity in the circumferential direction.

However, since the material of the damper 12 is a resin impregnated fiber, the elasticity of the material itself is small. on the other hand,
As the amplitude increases, the change in the radius of the concentric circle must also increase. However, it is difficult to increase the radius due to the small elongation of the material itself. As a result, there is a limit to increasing the amplitude.

FIG. 18 is a graph showing the relationship between the force applied to the damper 12 via the voice coil 9 and the vibration amplitude in the axial direction (Z axis) of the innermost periphery of the damper 12. As shown in the figure, the amplitude characteristic becomes non-linear from the force of 3N or more, and the amplitude value is saturated. Thus, in the conventional small speaker,
Since the damper has a large amplitude and is hardly deformed, a large input sound cannot be reproduced. In particular, there is a drawback that the bass reproduction characteristic is poor and distortion is increased.

The present invention has been made in view of such a conventional problem, and provides a speaker having excellent bass reproduction characteristics and less distortion by realizing a damper having a structure capable of deforming with a large amplitude. The purpose is to do.

[0012]

In order to solve such a problem, the invention according to claim 1 of the present application is directed to a diaphragm for applying air vibration, a cylindrical voice coil bobbin joined to the diaphragm, and the voice. In a speaker having a damper that supports a voice coil fixed to an outer peripheral portion of a coil bobbin in a magnetic gap formed by an annular top plate and a center pole, the damper is a voice coil bobbin attached to an outer peripheral portion of the voice coil bobbin. It has a mounting plate and an arcuate spring member having one end connected to the periphery of the voice coil bobbin mounting plate and the other end fixed to the speaker frame.

According to such a configuration, since the spring member is independent in the circumferential direction of the voice coil bobbin when the diaphragm vibrates up and down, there is no need to expand or contract the material in the circumferential direction. Therefore, the spring member is easily deformed, the vibration amplitude of the damper increases, and the characteristics of the force-displacement curve are excellent in linearity.

According to a second aspect of the present invention, there is provided a vibration plate for applying air vibration, a cylindrical voice coil bobbin joined to the vibration plate, and a voice coil fixed to an outer peripheral portion of the voice coil bobbin. In a speaker having a damper supported in a magnetic gap formed by a plate and a center pole, the damper has a voice coil bobbin mounting plate attached to an outer peripheral portion of the voice coil bobbin, and one end is provided around the voice coil bobbin mounting plate. And a plurality of arcuate spring members fixed to the speaker frame at the other end, and a connecting member for connecting the spring members.

According to a third aspect of the present invention, in the loudspeaker according to the second aspect, the spring member and the connecting member of the damper are integrally formed of an elastic resin. .

According to such a configuration, since the spring member is connected by the connecting member along the outer peripheral portion of the voice coil bobbin mounting plate, it is possible to prevent the voice coil from swaying in the vibration direction and to prevent the voice coil from rolling. Can be stronger.

According to a fourth aspect of the present invention, there is provided a vibration plate for applying air vibration, a cylindrical voice coil bobbin joined to the vibration plate, and a voice coil fixed to an outer peripheral portion of the voice coil bobbin. In a speaker having a damper supported in a magnetic gap constituted by a plate and a center pole, the damper includes a polygonal voice coil bobbin mounting plate mounted on an outer peripheral portion of the voice coil bobbin, and a voice coil bobbin mounting plate. A plurality of spring structures each having one end connected to a side,
And a mounting piece supported by the speaker frame and coupled to the other end of the spring structure.

According to a fifth aspect of the present invention, in the loudspeaker according to the fourth aspect, the spring structure is constituted by a connected body of a viscoelastic member and a stretchable elastic member. It is.

According to such a configuration, the spring structure is formed by connecting the viscoelastic member and the elastic member which can easily expand and contract, and is independent in the circumferential direction of the voice coil bobbin when the diaphragm vibrates up and down. No circumferential expansion or contraction of the material is required. Therefore, the elastic member is easily deformed, the vibration amplitude of the damper is increased, and the force-displacement curve has excellent linearity. Further, the damping of the viscoelastic member can prevent the resonance of the damper.

According to a sixth aspect of the present invention, there is provided a diaphragm for applying air vibration, a cylindrical voice coil bobbin joined to the diaphragm, and a voice coil fixed to an outer peripheral portion of the voice coil bobbin. In a speaker having a damper supported in a magnetic gap constituted by a plate and a center pole, the damper has a plurality of arc-shaped plural ends fixed to an outer peripheral portion of the voice coil bobbin and the other end fixed to a speaker frame. It is a spring member.

According to such a configuration, the spring member is independent in the circumferential direction of the voice coil bobbin when the diaphragm vibrates up and down, so that there is no need to expand or contract the material in the circumferential direction. Therefore, the spring member is easily deformed, the vibration amplitude of the damper increases, and the characteristics of the force-displacement curve are excellent in linearity.

According to a seventh aspect of the present invention, there is provided a vibration plate for applying air vibration, a cylindrical voice coil bobbin joined to the vibration plate, and a voice coil fixed to an outer peripheral portion of the voice coil bobbin. In a speaker having a damper supported in a magnetic gap formed by a plate and a center pole, the damper has an annular voice coil bobbin mounting portion fixed to an outer peripheral portion of the voice coil bobbin, and a circle fixed to a speaker frame. It is characterized by having an annular frame mounting portion, and a plurality of arcuate spring members connecting the voice coil bobbin mounting portion and the frame mounting portion in a radial direction of the voice coil bobbin.

According to an eighth aspect of the present invention, in the loudspeaker according to the seventh aspect, the voice coil bobbin mounting portion, the frame mounting portion, and the spring member of the damper are integrally formed of a resin having elasticity. It is characterized by the following.

According to such a configuration, the spring member is independent in the circumferential direction of the voice coil bobbin when the diaphragm vibrates up and down, so that there is no need to expand or contract the material in the circumferential direction. Therefore, the spring member is easily deformed, the vibration amplitude of the damper increases, and the characteristics of the force-displacement curve are excellent in linearity.

According to a ninth aspect of the present invention, there is provided a vibration plate for applying air vibration, a cylindrical voice coil bobbin joined to the vibration plate, and a voice coil fixed to an outer peripheral portion of the voice coil bobbin. In a speaker having a damper supported in a magnetic gap formed by a plate and a center pole, the damper has an annular voice coil bobbin mounting portion fixed to an outer peripheral portion of the voice coil bobbin, and a circle fixed to a speaker frame. An annular frame mounting portion, a plurality of arcuate spring members connecting the voice coil bobbin mounting portion and the frame mounting portion in a radial direction of the voice coil bobbin, and a plurality of spring members parallel to an outer periphery of the voice coil bobbin. And a connecting member connected along the direction.

According to a tenth aspect of the present invention, in the loudspeaker according to the ninth aspect, the voice coil bobbin mounting portion, the frame mounting portion, the spring member, and the connecting member of the damper are integrally formed of an elastic resin. It is characterized by being molded.

According to an eleventh aspect of the present invention, in the loudspeaker according to the ninth aspect, the connecting member is an annular member having elasticity in which arc portions having the same pitch as an arrangement interval of the spring members are connected. It is characterized by the following.

According to such a configuration, the spring member is connected to the annular member by the extendable connecting member arranged concentrically, thereby preventing the voice coil from swaying in the lateral direction and preventing the voice coil from rolling. Can be stronger.

According to a twelfth aspect of the present invention, there is provided a diaphragm for applying air vibration, a cylindrical voice coil bobbin joined to the diaphragm, and a voice coil fixed to an outer peripheral portion of the voice coil bobbin. In a speaker having a damper supported in a magnetic gap composed of a plate and a center pole, the damper has a roll-shaped structure having a circular cross section and a voice coil bobbin mounting plate integrally formed with a roll damper. A circular corrugation damper, which is fixed to the speaker frame, has an inner peripheral portion connected to the roll-shaped structure, and has a sheet having bending elasticity formed into a concentric corrugation.

According to a thirteenth aspect of the present invention, there is provided a diaphragm for applying air vibration, a cylindrical voice coil bobbin joined to the diaphragm, and a voice coil fixed to an outer peripheral portion of the voice coil bobbin. In a speaker having a damper supported in a magnetic gap constituted by a plate and a center pole, the damper has a circular corrugation damper in which a sheet having bending elasticity is formed into a concentric waveform, and an inner annular member having a different radius. An arc-shaped spring member radially connecting the outer annular member to the outer annular member, wherein the inner annular member is fixed to an outer peripheral portion of the voice coil bobbin, and the outer annular member is an inner peripheral portion of the corrugation damper. And an outer peripheral portion of the corrugation damper is fixed to a speaker frame. Than it is.

According to such a configuration, the spring member is independent in the circumferential direction of the voice coil bobbin when the diaphragm vibrates up and down, so that there is no need to expand or contract the material in the circumferential direction. Therefore, the spring member is easily deformed, the vibration amplitude of the damper increases, and the characteristics of the force-displacement curve are excellent in linearity. Furthermore, the corrugation damper connected to the spring member increases the center holding force, strengthens the rolling, and can provide a more appropriate stiffness.

According to a fourteenth aspect of the present invention, in the loudspeakers according to the first to thirteenth aspects, the spring member of the damper is constituted by a piano wire.

According to a fifteenth aspect of the present invention, in the loudspeaker according to the first to thirteenth aspects, the spring member of the damper is formed of a polymer resin wire.

According to such a configuration, since the spring member is made of a piano wire or a polymer wire, it is not affected by humidity, and the rigidity does not easily change even under high temperature and high humidity. For this reason, the bass characteristics of the speaker become stable even when the environmental temperature changes.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) A speaker according to Embodiment 1 of the present invention will be described with reference to the drawings, focusing on the structure of a damper. In the drawings of each embodiment, the same parts as those in the conventional example are denoted by the same reference numerals, and detailed description is omitted. FIG. 1 is an external perspective view of a spring member 20 constituting a part of a damper used in the speaker according to the first embodiment. The spring member 20 is formed by forming a wire made of cloth or thick yarn impregnated with a thermosetting resin into a semicircular shape. At both ends, a voice coil bobbin mounting plate to be described later and mounting portions 21a and 21b for connecting to a speaker frame are formed.

In FIG. 1, the linear spring member 20 is formed in a semicircular shape, but may be an ellipse formed by combining a straight line with an ellipse or a semicircle. In addition to the linear shape, the shape may be a thin plate. FIG. 2 is an external view of the damper 22 of the present embodiment. Damper 2
Reference numeral 2 denotes a substantially rectangular voice coil bobbin mounting plate 24 and a plurality of spring members 20 mounted at four corners thereof.
In the center of the voice coil bobbin mounting plate 24, a through hole 23 for fixing the voice coil bobbin 8 is formed. The spring member 20 and the voice coil bobbin mounting plate 24 are joined by bonding at a mounting portion 21a.

Assuming that the vibration direction of the voice coil bobbin 8 is the Z axis and the front of the speaker is + and the rear is-, the four corner spring members 20 have the same cross-sectional shape, and are semicircular convex in the + Z direction. It is an elastic member. FIG. 3 is a half sectional view of a speaker 1A having such a damper 22. As shown in FIGS. 2 and 3, one mounting portion 21 of the spring member 20 is provided.
b has the same height as the voice coil bobbin mounting plate 24,
It is connected to the mounting surface of the frame 2. The through-hole 23 of the voice coil bobbin mounting plate 24 is fixed to the outer peripheral surface of the voice coil bobbin 8 with an adhesive.

The operation of the speaker 1A having the damper 20 having such a structure will be described with reference to FIG. When a driving current flows through the voice coil 9, a driving force is generated on the voice coil bobbin 8 by an electromagnetic force, and the diaphragm 11 is moved to + Z,
-Generates sound by vibrating in the -Z direction. The damper 22 and the edge 13 elastically support the diaphragm 11 when the diaphragm 11 reciprocates.

FIG. 4 is a sectional view showing a deformed state of the damper 22 when the diaphragm 11 vibrates in the + Z direction. Since the voice coil bobbin mounting plate 24 is fixed to the outer peripheral surface of the voice coil bobbin 8, one mounting portion 21a of the damper 22 vibrates integrally with the voice coil bobbin 8. On the other hand, the other mounting portion 21b of the damper 22 does not displace because it is fixed to the frame 2.

In FIG. 4, the mounting portion 21a is displaced from A1 to A2 upon vibration, and elastically supports the vibration displacement of the diaphragm 11. When viewed from the Z-axis direction, the spring members 21 are linearly arranged from the four corners of the damper attachment plate 24 and are each elastically independent from each other. It does not involve circumferential shrinkage or expansion as in. Therefore, the force-displacement characteristics are excellent in linearity, and the maximum amplitude of the voice coil bobbin 8 can be increased.

FIG. 5 is a graph showing an example of the force-displacement characteristic of the damper 20 of the present embodiment, that is, an example of the electromagnetic force of the voice coil and the displacement of the innermost peripheral portion of the damper. Here 5
The linearity of the displacement is secured up to the external force of N, and the amplitude up to 5 mm is secured. Thus, it can be seen that, compared to the conventional characteristics shown in FIG. 18, both the linearity and the maximum amplitude show excellent characteristics. In the present embodiment, the shape of the voice coil bobbin mounting plate 24 is rectangular, but may be another polygon or circle as long as the circular through hole 23 is secured.

Embodiment 2 Next, a speaker according to Embodiment 2 of the present invention will be described. In the damper of the present embodiment, as a material of the spring member 20, a wire (polymer wire) of a piano wire or a polymer resin is formed into a semicircular shape instead of a cloth or a thick thread impregnated with a thermosetting resin. Things.
Note that the shape of the damper and the structure of the speaker are the same as those in the first embodiment, and a description thereof will be omitted.

The operation of the damper having such a structure will be described. Since the spring member 20 is made of a piano wire or a polymer wire, it is not affected by humidity, its rigidity does not easily change even under high temperature and high humidity, and the bass characteristics of the speaker are stably maintained.

(Embodiment 3) Next, a speaker according to Embodiment 3 of the present invention will be described with reference to the drawings, focusing on the structure of a damper. FIG. 6 is an external perspective view showing the structure of a damper 30 used in the speaker 1B of the present embodiment, and the same parts as those of the first embodiment are denoted by the same reference numerals, and detailed description is omitted. The outer shape of the spring member 20 constituting the damper 30 is the same as that shown in FIG. 1, and is different from the first embodiment in that connecting members 31 a and 31 b are newly provided.

As in FIG. 2, two spring members 20 are joined to the four corners of the voice coil bobbin mounting plate 24, respectively. Two connecting members 31a and 31b are joined along each side of the voice coil bobbin mounting plate 24 so as to connect the pair of spring members 20. The connecting member 31a connects the upper part of the spring member 20, and the connecting member 31b is a linear member connecting the mounting portion 21b of the spring member 20. With such a structure, the spring member 20 is unlikely to be deformed in a direction other than the Z direction, and the vibration direction of the voice coil bobbin 8 can be restricted to only the Z axis direction. In addition, all the spring members 20 and all the connecting members 31a and 31b are
It may be formed integrally with a resin having elasticity.

As in the case of FIG. 1, one mounting portion 21b of the spring member 20 has the same height as the voice coil bobbin mounting plate 24, and is fixed on the mounting surface of the frame 2. The through-hole 23 of the voice coil bobbin mounting plate 24 is fixed to the outer peripheral surface of the voice coil bobbin 8 with an adhesive.

The vibration characteristics of the damper 30 having such a structure will be described. The spring member 20 includes connecting members 31a, 3
1b is connected to each side of the voice coil bobbin mounting plate 24. During vibration in the Z direction, that is, vibration of the normal diaphragm 11, the connecting members 31a and 31b have no influence. However, when deforming in the X direction or the Y direction, the connecting members 31a and 31b exert resistance to each other. For example, when the voice coil bobbin 8 tries to vibrate in the X direction, the connecting members 31a and 31
b does not easily deform due to this vibration, and serves to hold the vibration system at the center. The same applies to the Y-axis direction. After all,
The connecting members 31a and 31b have no effect on the Z direction which is the normal vibration direction, and act as a resistance in other directions, thereby preventing the voice coil bobbin 8 from rolling.

(Embodiment 4) Next, a speaker according to Embodiment 4 of the present invention will be described with reference to the drawings, focusing on the structure of a damper. FIG. 7 is a plan view showing the structure of the damper 40 used in the speaker 1C of the present embodiment.

As shown in FIG. 7, the damper 40 includes a rectangular voice coil bobbin mounting plate 42 and four sets of spring members 41 supporting each side of the voice coil bobbin mounting plate 42.
And a mounting piece 43 for holding the other end of each pair of spring members 41.
a, 43b, 43c and 43d. The mounting pieces 43a to 43d have the same height as the voice coil bobbin mounting plate 42 in the Z-axis direction, and are joined on the mounting surface of the frame 2. The through-hole 44 of the voice coil bobbin mounting plate 42 is fixed to the outer peripheral surface of the voice coil bobbin 8 with an adhesive.

FIG. 8 is a perspective view showing a configuration example of the spring member 41. As shown in FIG. A spring member 41A shown in FIG. 8 (a) has a coil spring 45 composed of a piano wire or a polymer wire connected between two viscoelastic members 44, and can easily expand and contract upon vibration of a diaphragm. It is characterized by the following. The viscoelastic member 44 is preferably made of a material having a large loss, such as polymer silicon or foamed rubber.

The spring member 41B shown in FIG.
(A) The configuration order is reversed, and a viscoelastic member 47 is connected between two wires 46 made of a piano wire or a polymer wire. Although the shape of the wire 46 is a straight line, it may be a coil shape as shown in FIG.

The vibration characteristics of the damper 40 having such a structure will be described. As shown in FIG. 7, the spring members 41 are linearly arranged along four sides of the voice coil bobbin mounting plate 42, and are each elastically and independently mounted. The vibration of the voice coil bobbin 8 in the Z-axis direction does not involve contraction or expansion in the circumferential direction unlike the conventional waveform damper. Therefore, the force-displacement characteristics are excellent in linearity, and the maximum amplitude of the voice coil bobbin mounting plate 42 can be increased. Further, the spring member 41 is shown in FIG.
Since the viscoelastic members 44 and 47
0 itself can be suppressed from resonance. Further, as in the third embodiment, if the spring member 41 is connected by a connecting member, the rigidity of the voice coil bobbin against rolling can be increased.

(Embodiment 5) Next, a speaker according to Embodiment 5 of the present invention will be described with reference to the drawings, focusing on the structure of a damper. FIG. 9 is a perspective view showing the structure of a damper 50 used in the speaker 1D of the present embodiment. The outer shape of the damper 50 is the same as that shown in FIG. 1 except that there is no voice coil bobbin mounting plate.

The damper 50 of the present embodiment is configured such that the mounting portion 21a of the spring member 20 shown in FIG.
Is adhered to the outer peripheral surface of the. As shown in FIG. 9, the mounting portion 21a and the other mounting portion 21b of the spring member 20 are fixed to the voice coil bobbin 8 and the frame 2 at the same height.

The vibration characteristics of the damper 50 having such a structure will be described. The spring members 20 are radially arranged at equal intervals on the outer periphery of the voice coil bobbin 8, and each is elastically attached independently of each other. Therefore, the vibration of the voice coil bobbin 8 in the Z-axis direction does not involve contraction or expansion in the circumferential direction unlike a conventional corrugation damper (waveform damper). Therefore, the force-displacement characteristics are excellent in linearity, and the vibration amplitude of the voice coil bobbin 8 can be increased.

Further, since the spring member 20 is bonded to the voice coil bobbin 8 without using the voice coil bobbin mounting plate, the damper 50 can be reduced in weight because it can be supported by at least three spring members 20 as shown in the figure. Can be.
Therefore, this damper 50 is different from the previous embodiment.
This can be said to be suitable for smaller speakers.

(Embodiment 6) Next, a speaker according to Embodiment 6 of the present invention will be described with reference to the drawings, focusing on the structure of a damper. FIG. 10 is a perspective view showing the structure of a damper 60 used in the speaker 1E according to the sixth embodiment. The damper 60 is formed by connecting a number of spring members 20 in a petal shape between a ring-shaped voice coil bobbin mounting portion 61 and a frame mounting portion 62. The spring members 20 are arranged at equal intervals along the circumference,
It is curved in the + Z axis direction. The voice coil bobbin mounting portion 61 is connected on the outer peripheral surface of the voice coil bobbin 8, and the frame mounting portion 62 is fixed on the mounting surface of the frame 2.

The vibration characteristics of the damper 60 according to this embodiment will be described. The spring member 20 is a voice coil bobbin 8
Are arranged in a petal shape along the outer peripheral portion of each other, and are each elastically independent of each other. Therefore, the vibration of the voice coil bobbin 8 in the Z-axis direction does not involve contraction or expansion in the circumferential direction unlike a conventional waveform damper. For this reason, the force-displacement characteristics have excellent linearity, and the vibration amplitude of the voice coil bobbin 8 can be increased. Further, since the voice coil bobbin mounting portion 61 and the frame mounting portion 62 are integrated with the plurality of spring members 20, the bonding to the voice coil bobbin 8 and the frame 2 is facilitated.

Embodiment 7 Next, a speaker according to Embodiment 7 of the present invention will be described with reference to the drawings, focusing on the structure of the damper. FIG. 11 is a perspective view showing a structure of a damper 70 used in speaker 1F of the present embodiment. This damper 70 is obtained by joining a connecting member 71 as shown in FIG. 12 in addition to the structure of the damper 60 of the sixth embodiment.

The connecting member 71 is a ring-shaped member on which a large number of arc-shaped flexures having the same repetition interval as the arrangement pitch of the spring members 20 are formed. The connecting member 71 having such a shape is fixed on the many spring members 20. The connecting member 71 is formed by molding a piano wire or a polymer wire into a predetermined shape.

In the damper 70 having such a structure, since the spring member 20 is fixed by the ring-shaped connecting member 71, the spring member 20 does not deform in the circumferential direction, and the voice coil bobbin 8 does not roll. Further, since the connecting member 71 is formed with an arc portion along the circumferential direction, expansion and contraction in the circumferential direction becomes easy. Therefore, the vibration amplitude is unlikely to be limited unlike the corrugation damper. Here, the case where the number of the connecting members 71 is one is shown, but if a plurality of connecting members 71 are used, a damper more stable against rolling can be formed.

In the damper shown in FIG. 10, all the voice coil bobbin mounting portions 61 and the frame mounting portions 6
The spring member 2 and the spring member 20 may be integrally formed of an elastic resin. Further, in the damper shown in FIG. 11, all the voice coil bobbin mounting portions 61, the frame mounting portions 62, the spring members 20, and the connecting members 71 may be integrally formed of an elastic resin.

(Eighth Embodiment) Next, a loudspeaker according to an eighth embodiment of the present invention will be described with reference to the drawings, focusing on the structure of the damper. FIG. 13 is a perspective view showing a structure of a damper 80 used in speaker 1G of the present embodiment. This damper 80 is composed of a composite of a roll damper 81 and a corrugation damper 82.

The roll damper 81 is formed by forming four roll-shaped structures 81a on the outer periphery of a rectangular voice coil bobbin mounting portion 81d. A through-hole 81c is provided in the voice coil bobbin mounting portion 81d, and an arc-shaped mounting piece 81b is formed outside the roll-shaped structure 81a.

The corrugation damper 82 has the same structure as the damper shown in FIG. 16, the outer peripheral portion 82a is fixed to the frame 2, the inner peripheral portion 82b is joined to the mounting piece 81b of the roll damper 81, and supports the vibration system. Configuration. The roll-shaped structure 81a and the corrugation damper 81 are integrally formed or bonded by bonding. The material is a polymer or a thin metal foil.

The vibration characteristics of the damper 80 having such a structure will be described. The roll-shaped structure 81a of FIG.
The corrugation dampers 82 are linearly arranged on the inner peripheral portion 82b of the corrugation damper 82, and are each elastically independent of each other. For this reason, when the roll-shaped structure 81a is deformed, the material does not contract or expand in the circumferential direction unlike the conventional corrugated damper.

(Embodiment 9) Next, a speaker according to Embodiment 9 of the present invention will be described with reference to the drawings, focusing on the structure of the damper. FIG. 14 is a perspective view showing a structure of a damper 90 used in speaker 1H of the present embodiment. This damper 90 is composed of a composite of a corrugation damper 91 and a linear damper 92.

The corrugation damper 91 has the same structure as the damper shown in FIG. 16, the outer peripheral portion 91a is fixed to the frame 2, and the inner peripheral portion is connected to the linear damper 92. The linear damper 92 is formed by joining the spring member 20, the inner annular member 92a, and the outer annular member 92b of the above-described embodiments to each other. The inner annular member 92a is fixed to the outer peripheral portion of the voice coil bobbin 8, and is connected to the outer annular member 92b via a plurality of spring members 20 so as to be freely vibrated.

In the damper 90 shown in FIG.
Are elastically arranged independently of each other, so that the vibration of the voice coil bobbin 8 in the Z-axis direction does not involve the contraction or expansion of the material in the circumferential direction unlike the conventional waveform damper. For this reason, the force-displacement characteristics have excellent linearity, and the vibration amplitude of the voice coil bobbin 8 can be increased.

On the other hand, the corrugation damper 82 or 91 disposed on the outside has a large stiffness and its inner peripheral portion is replaced by a support structure having excellent linearity, so that a structure having relatively excellent linearity remains. Become. With such a configuration, in addition to the characteristics of the roll structure having good linearity,
The characteristic of the corrugation damper whose force displacement characteristic changes gradually is added. For this reason, a vibration excellent in linearity is obtained in a place where the force is small, and a supporting system that gently brakes against excessive input is realized.

[0071]

According to the first aspect of the present invention, as described above in detail, the spring member is provided with
Since the voice coil bobbin is independent in the circumferential direction, there is no need to expand or contract the material in the circumferential direction. Therefore, the spring member is easily deformed, the amplitude of vibration is large, and the linearity of the force displacement curve is excellent. For this reason, the vibration amplitude of the diaphragm can be increased, and a small speaker with little distortion even at a large input can be realized.

According to the second and third aspects of the present invention, since the spring member is connected by the connecting member along the outer periphery of the voice coil bobbin mounting plate, the vibration of the voice coil perpendicular to the vibration direction can be prevented. Can be strong against rolling. Therefore, it is possible to realize a speaker that does not easily generate an abnormal sound even with a large input.

According to the fourth and fifth aspects of the present invention, the spring structure is formed by connecting a viscoelastic member and an elastic member which can easily expand and contract. The material does not need to expand and contract in the circumferential direction because it is independent of the material. Therefore, the elastic member is easily deformed, the vibration amplitude is large, and the linearity of the force displacement curve is excellent. Further, the damping of the viscoelastic member can prevent the resonance of the damper. Therefore, a speaker having a flat frequency characteristic can be realized.

According to the present invention, since the spring member is independent in the circumferential direction of the voice coil bobbin when the diaphragm vibrates up and down, there is no need to expand or contract the material in the circumferential direction. Accordingly, the spring member is easily deformed, the vibration amplitude is large, and the linearity of the force displacement curve is excellent. For this reason, the vibration amplitude of the diaphragm can be increased, and a small speaker with little distortion even at a large input can be realized.

According to the invention of claims 9 to 11,
The spring member is connected to the annular member by an expandable and contractible connecting member arranged concentrically, so that the voice coil can be prevented from swinging in the lateral direction and can be strengthened against rolling. Therefore, it is possible to realize a speaker that does not easily generate an abnormal sound even with a large input.

According to the twelfth and thirteenth aspects, the spring member is independent of the voice coil bobbin in the circumferential direction when the diaphragm vibrates up and down, so that there is no need to expand or contract the material in the circumferential direction. Therefore, the spring member is easily deformed,
The vibration amplitude is large, and the characteristics are excellent in linearity of the force displacement curve. Furthermore, the corrugation damper enhances the center holding force, is strong in rolling, and can give a moderate stiffness. For this reason, the vibration amplitude of the diaphragm can be increased, and a small loudspeaker with little distortion even at a large input can be realized. In addition, a gentle braking can be applied at the time of an excessive input, and a speaker that is hardly damaged can be realized.

According to the fourteenth and fifteenth aspects of the present invention, since the spring member is made of a piano wire or a polymer wire, the rigidity does not easily change even under high temperature and high humidity without being affected by humidity. The bass characteristics of the speaker can be stably maintained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a structure of a spring member used in a damper according to each embodiment of the present invention.

FIG. 2 is a perspective view showing a structure of a main part of the speaker according to Embodiment 1 of the present invention.

FIG. 3 is a half sectional view showing a structure of the speaker according to the first embodiment.

FIG. 4 is a half sectional view showing a displacement state of a damper in the first embodiment.

FIG. 5 is a characteristic diagram of force versus displacement of the damper according to the first embodiment.

FIG. 6 is a perspective view showing a structure of a main part of a speaker according to Embodiment 3 of the present invention.

FIG. 7 is a perspective view showing a structure of a main part of a speaker according to Embodiment 4 of the present invention.

FIG. 8A is a perspective view illustrating a structure of a spring member (part 1) used in a damper according to a fourth embodiment, and FIG.
FIG. 4 is a perspective view showing a structure of a spring member (2).

FIG. 9 is a perspective view showing a structure of a main part of a speaker according to Embodiment 5 of the present invention.

FIG. 10 is a perspective view showing a structure of a main part of a speaker according to a sixth embodiment of the present invention.

FIG. 11 is a perspective view showing a structure of a main part of a speaker according to Embodiment 7 of the present invention.

FIG. 12 is a perspective view illustrating a structure of a connecting member used for a damper according to a seventh embodiment.

FIG. 13 is a perspective view showing a structure of a main part of a speaker according to Embodiment 8 of the present invention.

FIG. 14 is a perspective view showing a structure of a main part of a speaker according to Embodiment 9 of the present invention.

FIG. 15 is a half sectional view showing an example of the structure of a conventional small speaker.

FIG. 16 is a perspective view showing a structure of a damper of a conventional speaker.

FIG. 17 is a half sectional view showing a deformed state of a damper of a conventional speaker.

FIG. 18 is a characteristic diagram of force versus displacement of a damper of a conventional speaker.

[Explanation of symbols]

1,1A, 1B, 1C, 1D, 1E, 1F, 1G, 1H
Speaker 2 Frame 3 Center pole 4 Magnet 5 Top plate 6 Annular magnetic circuit 7 Air gap 8 Voice coil bobbin 9 Voice coil 11 Diaphragm 12, 22, 30, 40, 50, 60, 70, 80, 9
0 damper 13 edge 14 speaker 20, 41A, 41B spring member 21a, 21b mounting portion 24, 42, 84, 91 voice coil bobbin mounting plate 23, 44, 81c through hole 31a, 31b, 71 connecting member 43a, 43b, 43c, 43d , 81b Mounting pieces 44, 47 Viscoelastic member 45 Coil spring 46 Wire 61, 81d Voice coil bobbin mounting part 62 Frame mounting part 81 Roll damper 82, 91 Corrugation damper 81a Roll-shaped structure 82a, 91a Outer peripheral part 82b Inner peripheral part 92 wire Damper 92a inner annular member 92b outer annular member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tohru Yoshikawa 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (15)

[Claims] 1. A magnetic plate comprising: a vibrating plate for applying air vibration; a cylindrical voice coil bobbin joined to the vibrating plate; and a voice coil fixed to an outer peripheral portion of the voice coil bobbin, comprising an annular top plate and a center pole. In a speaker having a damper supported in an air gap, the damper includes a voice coil bobbin mounting plate mounted on an outer peripheral portion of the voice coil bobbin, one end connected to the periphery of the voice coil bobbin mounting plate, and the other end connected to the speaker frame. A speaker comprising: a fixed arcuate spring member. 2. A magnetic plate comprising: a vibration plate for applying air vibration; a cylindrical voice coil bobbin joined to the vibration plate; and a voice coil fixed to an outer peripheral portion of the voice coil bobbin, comprising a ring-shaped top plate and a center pole. In a speaker having a damper supported in an air gap, the damper is connected to a voice coil bobbin mounting plate mounted on an outer peripheral portion of the voice coil bobbin, one end is connected along the periphery of the voice coil bobbin mounting plate, and the other end is a speaker. A speaker comprising: a plurality of arcuate spring members fixed to a frame; and a connecting member that connects the spring members. 3. The loudspeaker according to claim 2, wherein the spring member and the connecting member of the damper are integrally formed of an elastic resin. 4. A magnetic plate comprising a vibrating plate for applying air vibration, a cylindrical voice coil bobbin joined to the vibrating plate, and a voice coil fixed to an outer peripheral portion of the voice coil bobbin, comprising an annular top plate and a center pole. In a speaker having a damper supported in an air gap, the damper includes a polygonal voice coil bobbin mounting plate mounted on an outer peripheral portion of the voice coil bobbin, and a plurality of ends each connected to each side of the voice coil bobbin mounting plate. And a mounting piece supported by a speaker frame and coupled to the other end of the spring structure. 5. The loudspeaker according to claim 4, wherein said spring structure is formed of a connection body of a viscoelastic member and a stretchable elastic member. 6. A magnetic plate comprising: a vibration plate for applying air vibration; a cylindrical voice coil bobbin joined to the vibration plate; and a voice coil fixed to an outer peripheral portion of the voice coil bobbin, comprising a ring-shaped top plate and a center pole. In a speaker having a damper supported in a gap, the damper is a plurality of arc-shaped spring members having one end fixed to an outer peripheral portion of the voice coil bobbin and the other end fixed to a speaker frame. Speaker. 7. A magnetic plate comprising: a vibration plate for applying air vibration; a cylindrical voice coil bobbin joined to the vibration plate; and a voice coil fixed to an outer peripheral portion of the voice coil bobbin, comprising a ring-shaped top plate and a center pole. In a speaker having a damper supported in an air gap, the damper includes: an annular voice coil bobbin mounting portion fixed to an outer peripheral portion of the voice coil bobbin; an annular frame mounting portion fixed to a speaker frame; A speaker comprising: a plurality of arc-shaped spring members for connecting a coil bobbin mounting portion and the frame mounting portion in a radial direction of a voice coil bobbin. 8. The speaker according to claim 7, wherein the voice coil bobbin mounting portion, the frame mounting portion, and the spring member of the damper are integrally formed of an elastic resin. 9. A magnetic plate comprising: a diaphragm for applying air vibration; a cylindrical voice coil bobbin joined to the diaphragm; and a voice coil fixed to an outer peripheral portion of the voice coil bobbin, comprising a ring-shaped top plate and a center pole. In a speaker having a damper supported in an air gap, the damper includes: an annular voice coil bobbin mounting portion fixed to an outer peripheral portion of the voice coil bobbin; an annular frame mounting portion fixed to a speaker frame; A plurality of arcuate spring members for connecting the coil bobbin mounting portion and the frame mounting portion in the radial direction of the voice coil bobbin; and a connecting member for connecting the plurality of spring members along a direction parallel to the outer periphery of the voice coil bobbin. And a speaker. 10. The speaker according to claim 9, wherein the voice coil bobbin mounting portion, the frame mounting portion, the spring member, and the connecting member of the damper are integrally formed of an elastic resin. 11. The loudspeaker according to claim 9, wherein the connecting member is an elastic annular member in which arc portions having the same pitch as the arrangement interval of the spring members are connected. 12. A magnetic plate comprising: a vibration plate for applying air vibration; a cylindrical voice coil bobbin joined to the vibration plate; and a voice coil fixed to an outer peripheral portion of the voice coil bobbin, comprising a ring-shaped top plate and a center pole. In a speaker having a damper supported in an air gap, the damper comprises: a roll damper in which a roll-shaped structure having a circular cross section and a voice coil bobbin mounting plate are integrally formed; an outer peripheral portion fixed to a speaker frame; A circular corrugation damper coupled to the roll-shaped structure, a sheet having bending elasticity is formed into a concentric corrugation,
A speaker comprising: 13. A magnetic plate comprising: a vibration plate for providing air vibration; a cylindrical voice coil bobbin joined to the vibration plate; and a voice coil fixed to an outer peripheral portion of the voice coil bobbin, comprising a ring-shaped top plate and a center pole. In a speaker having a damper supported in a gap, the damper radially connects a circular corrugation damper in which a sheet having bending elasticity is formed in a concentric waveform, and an inner annular member and an outer annular member having different radii. Wherein the inner annular member is fixed to an outer peripheral portion of the voice coil bobbin, the outer annular member is connected to an inner peripheral portion of the corrugation damper, and an outer periphery of the corrugation damper is provided. The speaker is fixed to the speaker frame. 14. The speaker according to claim 1, wherein the spring member of the damper is formed of a piano wire. 15. The loudspeaker according to claim 1, wherein the spring member of the damper is made of a polymer resin wire.