JPH07298389A - Speaker - Google Patents

Abstract

PURPOSE:To obtain the speaker in thin and long structure which hardly causes split resonance and have flat frequency characteristics and is superior in tone quality. CONSTITUTION:A diaphragm 1a is formed in an axially asymmetrical shape which has a long-axis direction and a short-axis direction, and swelled toward a vibration direction. The shape of a voice coil 6a driving the diaphragm 1a is made beltlike so that the outer peripheral part of the diaphragm la is surrounded. The diaphragm 1a and a voice coil bobbin 6a are held in a frame 11a through an edge 3a. A yoke 8a, a magnet 9a, and a plate 10a which constitute a magnetic circuit 21 are also formed in an elliptic shape similar to the diaphragm 1a when viewed from the center axis of the diaphragm 1a. Consequently, the rigidity of the diaphragm 1a is increased and the whole diaphragm is driven, so split resonance of the diaphragm 1a is hardly caused to obtain flat frequency characteristics in an intermediate and a high frequency range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker having an elongated structure and excellent sound quality.

[0002]

2. Description of the Related Art In recent years, with the widespread use of so-called high-vision and wide-vision televisions, the screens of televisions are becoming generally horizontal. On the other hand, however, due to the housing situation in Japan, narrow and thin TV sets are desired as a whole.

A speaker unit for a television (hereinafter referred to as a speaker) is usually attached to both sides of a cathode ray tube, which is one of the causes for increasing the width of the television set. Therefore, a speaker having an elongated structure such as a rectangular shape or an elliptical shape has been conventionally used for a television. In addition, the horizontal width of the cathode-ray tube is required to make the width of the speaker even narrower, and at the same time, it is required to improve the sound quality of the audio corresponding to the high image quality of the screen.

Here, a conventional slender speaker will be described with reference to FIGS. 16A and 16B are configuration diagrams of a conventional speaker having an elongated structure, in which FIG. 16A is a plan view, FIG. 16B is a sectional view in the major axis direction, and FIG. 16C is a sectional view in the minor axis direction. In this figure, the diaphragm 1e is an elongated diaphragm that generates air vibrations, and has dimensions as shown in FIG. 18, for example. An edge 3e is joined to the outer peripheral portion of the diaphragm 1e and is held by the frame 11e.

A voice coil bobbin 6e is fixed to the central portion of the diaphragm 1e, and a frame 11 is provided via a damper 4e.
It is held by e. On the other hand, the frame 11e
The yoke 8e, the magnet 9e, the plate 10
A magnetic circuit 26 consisting of e is provided. The voice coil wound around the voice coil bobbin 6e is held in the space of the magnetic circuit 26, and the voice coil bobbin 6e makes a piston motion by the drive current, and the diaphragm 1e vibrates in that direction. As a result, a sound wave is emitted from the diaphragm 1e.

FIG. 17 shows the frequency characteristics of the reproduced sound pressure level of this speaker. The vertical axis shows the reproduced sound pressure level at a point of 1 m on the front axis when 1 W is input to this speaker, and the horizontal direction. The axis shows the drive frequency.

[0007]

However, the conventional speaker as described above has the following problems.
That is, the speaker of FIG. 16 adopts a driving method in which the central portion of the elongated diaphragm 1e is point-driven, so that split resonance in the major axis direction is likely to occur. As a result, in the middle and high frequencies, a peak dip occurs on the frequency characteristic of the reproduced sound pressure, resulting in deterioration of sound quality. For example, on the characteristic shown in FIG.
Significant dips are seen at 2 kHz, 3 kHz and 5 kHz.

The width of the drive system including the magnetic circuit 26 and the voice coil bobbin 6e needs to be smaller than the length of the minor axis of the speaker. Therefore, in the speaker having such a structure, it is physically impossible to increase the diameter of the voice coil bobbin 6e, so that the wire length L of the voice coil cannot be increased. Further, since the volume of the magnet 9e is limited to be small, the magnetic flux density B of the air gap cannot be sufficiently secured. As a result, the drive system force coefficient (B × L)
Became smaller and it was difficult to increase the conversion efficiency. Further, the damper 4e needs to have a small radius of curvature and a small width so as to be housed inside the frame 11e.
As a result, the stiffness of the vibration system becomes large, the minimum resonance frequency f0 rises, and there is a drawback that it is difficult to reproduce the low frequency range.

The present invention has been made in view of the above-mentioned conventional problems, and has a narrow width (slender structure),
An object of the present invention is to obtain a speaker with excellent sound quality, in which split resonance is unlikely to occur, a flat frequency characteristic is obtained, conversion efficiency is increased, and resonance frequency f0 is suppressed to a low level to enable reproduction in a low frequency range.

[0010]

According to a first aspect of the invention of the present application, a plane shape viewed from a vibration direction is a non-axisymmetrical shape having a major axis and a minor axis, and is convex in a sound radiating direction. A curved diaphragm, a voice coil bobbin formed along the outer peripheral portion of the diaphragm parallel to the vibration direction and having a band-shaped upper end bonded to the outer peripheral portion of the diaphragm, and an outer peripheral surface of the voice coil bobbin. It is characterized by including a wound voice coil and a magnetic circuit for giving a magnetic flux for vibration to the voice coil.

According to the invention of claim 2 of the present application, a non-axisymmetric diaphragm having a plane shape viewed from the vibration direction has a major axis and a minor axis, and a plane shape viewed from the vibration direction has a major axis and a minor axis. A non-axisymmetric type having a voice coil bobbin having linear portions, at least some of which are parallel to each other in the direction of the major axis, and the upper end of which is bonded to the diaphragm, and is wound around the outer peripheral surface of the voice coil bobbin. And a magnetic circuit for applying a vibration magnetic flux to the voice coil. The magnetic circuit drives a linear portion of the voice coil bobbin.

In the invention of claim 3 of the present application, the magnetic circuit is
The magnet is provided with a yoke having a concave cross section, a magnet fixed to the bottom surface of the yoke, and a plate fixed to the upper portion of the magnet and facing the inner surface of the yoke via a gap. It is characterized in that it is magnetized in the vibration direction of the diaphragm.

In the invention of claim 4 of the present application, the magnetic circuit comprises:
A yoke having a concave cross section, a magnet fixed to one inner surface of the yoke, opposed to the other inner surface of the yoke via a gap, and magnetized in a direction perpendicular to the vibration direction of the diaphragm, The present invention is characterized in that two sets of magnetic circuits are provided with the central axis of the major axis of the diaphragm as the axis of symmetry.

According to the invention of claim 5 of the present application, a non-axisymmetric diaphragm whose planar shape viewed from the vibration direction has a major axis and a minor axis, a voice coil bobbin bonded to the diaphragm, and an outer periphery of the voice coil bobbin. A voice coil wound around the surface,
The voice coil bobbin comprises a magnetic circuit for applying a magnetic flux for vibration to the voice coil, and the voice coil bobbin has a linear protrusion parallel to the outer peripheral portion of the diaphragm integrally formed on the upper end portion formed in a belt shape in parallel with the vibration direction. It is characterized by having a fold formed.

According to a sixth aspect of the present invention, a non-axisymmetric diaphragm whose planar shape as viewed from the vibration direction has a major axis and a minor axis, a voice coil bobbin bonded to the diaphragm, and an outer periphery of the voice coil bobbin. A voice coil wound around the surface,
The voice coil bobbin comprises a rib having a linear protrusion parallel to the outer peripheral portion of the diaphragm at the upper end formed in a strip shape parallel to the vibration direction. Is provided.

According to a seventh aspect of the invention of the present application, a non-axisymmetric diaphragm whose planar shape as viewed from the vibration direction has a major axis and a minor axis, a voice coil bobbin bonded to the diaphragm, and an outer periphery of the voice coil bobbin. A voice coil wound around the surface,
And a magnetic circuit for applying a magnetic flux for vibration to the voice coil, wherein the voice coil bobbin is disposed between the surfaces of the diaphragm facing each other in the minor axis direction, parallel to the vibration direction of the diaphragm, and perpendicular to the facing surface. It has a thin plate-shaped reinforcing member that is stretched over the magnetic circuit.
It is characterized in that a plurality of them are provided through a constant space.

According to the invention of claim 8 of the present application, a non-axisymmetric diaphragm whose planar shape as viewed from the vibration direction has a major axis and a minor axis, a voice coil bobbin bonded to the diaphragm, and an outer periphery of the voice coil bobbin. A voice coil wound around the surface,
And a magnetic circuit that applies a magnetic flux for vibration to the voice coil, wherein the diaphragm has an arc-shaped thin plate reinforcing member joined to the inner surface of the diaphragm in the minor axis direction of the diaphragm. It is a thing.

According to the invention of claim 9 of the present application, a non-axisymmetric diaphragm whose planar shape as viewed in the vibration direction has a major axis and a minor axis, a voice coil bobbin bonded to the diaphragm, and an outer periphery of the voice coil bobbin. A voice coil wound around the surface,
And a magnetic circuit that applies a magnetic flux for vibration to the voice coil, wherein the diaphragm has arc-shaped ribs formed integrally with the diaphragm that are coupled to the inner surface of the diaphragm in the minor axis direction of the diaphragm. It is characterized by that.

According to a tenth aspect of the present invention, there is provided a diaphragm which has a non-axisymmetric planar shape having a major axis and a minor axis when viewed in a vibration direction, and is curved in a convex shape in a sound radiating direction. , An edge having elasticity which is joined in a strip shape along the outer peripheral portion of the diaphragm and which holds the diaphragm in a vibrating manner, and a strip shape formed along the outer peripheral portion of the diaphragm in parallel with the vibration direction, and the upper end of the strip shape The voice coil bobbin whose part is adhered to the outer peripheral surface of the diaphragm, the voice coil wound around the outer peripheral part of the voice coil bobbin, the magnetic circuit for giving a magnetic flux for vibration to the voice coil, and provided in the minor axis direction of the diaphragm. And a thin plate-like connecting member joined to the inner surface of the diaphragm, a damper that holds the lower end portion of the connecting member in a vibrating manner, and an elastic member that is parallel to the edge, an outer peripheral portion of the edge, a magnetic circuit, The frame that holds the damper, It is characterized in that Bei.

According to a tenth aspect of the present invention, there is provided a diaphragm which has a non-axisymmetric planar shape having a major axis and a minor axis when viewed in a vibration direction and which is convexly curved in a sound radiating direction. An edge having elasticity that is joined along the outer peripheral surface of the diaphragm in a band shape and that elastically holds the diaphragm, and a belt shape that is formed along the outer peripheral portion of the diaphragm parallel to the vibration direction and has an upper end. The voice coil bobbin whose part is adhered to the outer peripheral portion of the diaphragm, the voice coil wound around the outer peripheral surface of the voice coil bobbin, the magnetic circuit for giving a magnetic flux for vibration to the voice coil, and provided in the minor axis direction of the diaphragm. And a damper provided with a thin plate-like connecting member that is joined to the inner surface of the diaphragm, an elastic member that vibratably holds the lower end side of the connecting member, and that is parallel to the minor axis direction of the diaphragm, and the outer periphery of the edge. Section that holds the parts, the magnetic circuit, and the damper. It is characterized in that it comprises arm and, a.

According to a twelfth aspect of the present invention, there is provided a vibrating plate, which has a non-axisymmetric shape in plan view having a major axis and a minor axis when viewed in a vibration direction and is curved in a convex shape in a sound radiating direction. , An edge having elasticity which is joined in a strip shape along the outer peripheral portion of the diaphragm and which holds the diaphragm in a vibrating manner, and a strip shape formed along the outer peripheral portion of the diaphragm in parallel with the vibration direction, and the upper end of the strip shape The voice coil bobbin whose part is adhered to the outer peripheral portion of the diaphragm, the voice coil wound around the outer peripheral surface of the voice coil bobbin, the magnetic circuit for giving a magnetic flux for vibration to the voice coil, and provided in the minor axis direction of the diaphragm. A thin plate-like connecting member to be joined to the outer surface of the diaphragm, a damper that vibratably holds the upper end of the connecting member and is parallel to the edge, and a mounting member that is provided on the outer peripheral portion of the edge and holds the damper. And the outer periphery of the edge, magnetic And it is characterized by comprising a frame for holding the mounting member.

According to a thirteenth aspect of the present invention, there is provided a vibrating plate which is a non-axisymmetrical shape having a major axis and a minor axis as viewed in a vibration direction and curved in a convex shape in a sound radiating direction. , An edge having elasticity which is joined in a strip shape along the outer peripheral portion of the diaphragm and which holds the diaphragm in a vibrating manner, and a strip shape formed along the outer peripheral portion of the diaphragm in parallel with the vibration direction, and the upper end of the strip shape The voice coil bobbin whose part is adhered to the outer peripheral portion of the diaphragm, the voice coil wound around the outer peripheral surface of the voice coil bobbin, the magnetic circuit for giving a magnetic flux for vibration to the voice coil, and provided in the minor axis direction of the diaphragm. A thin plate-like connecting member that is joined to the outer surface of the diaphragm, a damper that holds the upper end of the connecting member so that it can vibrate, and that is parallel to the minor axis direction of the diaphragm.
A mounting member that is provided between the outer peripheral portions of the edge so as to straddle the diaphragm and that holds the damper, the outer peripheral portion of the edge, the magnetic circuit,
And a frame for holding the mounting member.

According to a fourteenth aspect of the present invention, there is provided a diaphragm, which has a non-axisymmetric planar shape having a major axis and a minor axis when viewed in a vibration direction, and is curved in a convex shape in a sound radiating direction. , An edge having elasticity which is joined in a strip shape along the outer peripheral portion of the diaphragm and which holds the diaphragm in a vibrating manner, and a strip shape formed along the outer peripheral portion of the diaphragm in parallel with the vibration direction, and the upper end of the strip shape The voice coil bobbin whose part is adhered to the outer peripheral portion of the diaphragm, the voice coil wound around the outer peripheral surface of the voice coil bobbin, the magnetic circuit for giving a magnetic flux for vibration to the voice coil, and provided in the minor axis direction of the diaphragm. A thin plate-like connecting member that is joined to the inner surface of the diaphragm and the inner surface of the voice coil bobbin, a lower end portion of the connecting member that is vibratably held, a damper that is parallel to the major axis direction of the diaphragm, and an outer peripheral portion of the edge. Holds magnetic circuit and damper Is characterized in that it comprises a frame that, the.

According to a fifteenth aspect of the present invention, a non-axisymmetric diaphragm whose planar shape as viewed from the vibration direction has a major axis and a minor axis is joined to a diaphragm along the outer peripheral portion of the diaphragm to vibrate. An edge for oscillatingly holding the plate, a voice coil bobbin bonded to the diaphragm, a voice coil wound around the outer peripheral surface of the voice coil bobbin, and a magnetic circuit for giving a magnetic flux for vibration to the voice coil are provided. The edge is characterized in that the width of the edge is wider at the portion where the outer peripheral portion of the diaphragm is arcuate than at the portion where the outer peripheral portion is linear.

[0025]

According to the inventions of claims 1 to 4 having the above characteristics, the entire vibration plate is driven by making the voice coil bobbin the same non-axisymmetric shape as the vibration plate. Therefore, split resonance in the long axis direction is less likely to occur. Furthermore, the wire length of the voice coil is considerably longer than that of the conventional one, and the volume of the magnet can be increased, so that the driving force is increased.

According to the inventions of claims 5 to 9 of the present application,
The rigidity of the diaphragm is increased by bonding the reinforcing member along the minor axis direction of the diaphragm and providing the ribs in the shape of an arch.

According to the tenth to fourteenth aspects of the present invention, the stiffness of the vibration system is lowered by providing the damper parallel to the edge or parallel to the minor axis direction of the diaphragm.

Further, according to the invention of claim 15 of the present application,
The width of the edge is widened in the portion where the radius of curvature of the outer periphery of the diaphragm is small. Therefore, the stiffness of the edge is lowered, and the low frequency range can be reproduced.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A speaker according to a first embodiment of the present invention will be described with reference to FIG. 1A and 1B are configuration diagrams of a speaker having an elongated structure according to a first embodiment. FIG. 1A is a plan view, FIG. 1B is a cross-sectional view in a major axis direction, and FIG. 1C is a cross-sectional view in a minor axis direction. In this figure, a diaphragm 1a is a substantially elliptical diaphragm, and as shown in FIGS. 1 (b) and 1 (c), it is a non-axisymmetric type (non-rotationally symmetric type) having a major axis direction and a minor axis direction. ,
Has a bulge in the vibration direction. The edge 3a is joined to the outer peripheral portion of the diaphragm 1a, and the frame 1
1a.

The edge 3a is made of a material having excellent elasticity, is a member having an arc-shaped cross section, and is formed in a strip shape along the outer periphery of the diaphragm 1a. Different from the conventional speaker, the voice coil bobbin 6 having the same contour shape as the outer peripheral portion of the diaphragm 1a.
a is fixed to the diaphragm 1a. The voice coil bobbin 6a is formed by forming a sheet-like member into a band shape along the outer periphery of the diaphragm 1a, the upper end of which is bonded to the diaphragm 1a, and a voice coil (not shown) is wound around the lower end.

The frame 11a is formed in a box shape, its side surface is bent into an elliptical shape along the edge 3a, and its bottom surface is in an elliptical plate shape. On the bottom surface of the frame 11a, a yoke 8a and a magnet 9 for forming the magnetic circuit 21 are formed.
a and the plate 10a are attached. The yoke 8a is a box-shaped magnetic body similar to the frame 11a, and its cross-sectional shape is U-shaped in both the minor axis direction and the major axis direction. The magnet 9a attached to the upper part of the bottom surface of the yoke 8a has an elliptical shape similar to the planar shape of the diaphragm 1a. The plate 10a is also called a center plate, and is a member that generates a magnetic flux in a gap facing the inner peripheral surface of the side surface of the yoke 8a, and is made of a magnetic material. Here the plate 10a
Is slightly smaller than the inner peripheral surface of the side surface of the yoke 8a.

In the speaker constructed as described above, since the diaphragm 1a has a bulge in the central axis direction, the rigidity of the diaphragm 1a is improved. Further, since the entire diaphragm 1a receives the driving force integrally, it becomes difficult to excite the split resonance in the long axis direction, and a flat frequency characteristic is obtained in the middle-high range. Further, the line length L of the voice coil can be made considerably longer than that of the conventional speaker shown in FIG. 16, and the volume of the magnet 9a can be increased, so that the driving force is increased and the conversion efficiency can be improved. In addition, although the case where the planar shapes of the diaphragm 1a and the magnetic circuit 21 are elliptical has been described in the present embodiment, the shapes are not limited thereto.

Next, a speaker according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 2 is a diagram showing the structure of the speaker (part 1) of the second embodiment,
(A) is a plan view, (b) is a cross-sectional view in the major axis direction, and (c) is a cross-sectional view in the minor axis direction, which are enlarged two times. Figure 2
In FIG. 2, the diaphragm 1b is a substantially track-shaped diaphragm that generates air vibrations, and is a non-axisymmetric type having a major axis direction and a minor axis direction as shown in FIGS. Has a semi-cylindrical bulge toward. The edge 3b is joined to the outer peripheral portion of the diaphragm 1b, and the frame 1
It is held at 1b.

The edge 3b is a member having an arcuate cross section as in the first embodiment, and is formed in a band shape along the outer periphery of the diaphragm 1b. A voice coil bobbin 6b having the same contour as the outer peripheral portion of the diaphragm 1b is fixed to the diaphragm 1b. The voice coil bobbin 6b is formed by forming a sheet-like member into a band shape along the outer periphery of the diaphragm 1b. The diaphragm 1b is adhered to the upper end and a voice coil (not shown) is wound around the lower end. It

The frame 11b is formed in a box shape, its side surface is bent into a rectangle along the edge 3b, and its bottom surface is in a rectangular shape. A yoke 8b, a magnet 9b, and a plate 10b for forming the magnetic circuit 22 are attached to the bottom surface of the frame 11b. The magnet 9b attached to the upper part of the bottom surface of the yoke 8b is magnetized in the central axis direction of the diaphragm 1b.

In the speaker thus constructed,
Since the voice coil bobbin 6b is integrally driven as in the first embodiment, the split resonance in the major axis direction of the diaphragm 1b is not easily excited. FIG. 3 shows the frequency characteristics of the speaker of this example measured under the same conditions as in FIG. Here, it can be seen that the peak dip in the mid-high range is eliminated and a flat frequency characteristic is obtained in the mid-high range, as compared with the characteristic of FIG. Further, the lowest resonance frequency f0 is 180 Hz in FIG. 17, whereas it is greatly reduced to 100 Hz in FIG. 3, and it is possible to reproduce in a lower range. Furthermore, since the magnetic circuit 22 has a linear shape, it is easy to manufacture the members that form the magnetic circuit, and mass productivity is excellent.

4A and 4B are views showing the configuration of a speaker (No. 2) in the second embodiment of the present embodiment. FIG. 4A is a plan view, FIG. 4B is a sectional view in the major axis direction, and FIG. It is a sectional view of the minor axis direction, and is enlarged twice. The same parts as those of the speaker of FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. Figure 4
As shown in (c), the magnetic circuit 23 is
It is divided into sets. The magnetic circuit 23 is composed of a yoke 8c having a U-shaped cross section, and a magnet 9c attached to one of both side surfaces of the yoke 8c closer to the central axis of the diaphragm 1b. The magnet 9c is smaller than that shown in FIG. 2C, and is magnetized in a direction orthogonal to the central axis of the diaphragm 1b.

The speaker configured in this way has a different magnetic circuit configuration from the speaker shown in FIG. 2, but the operation and the effect are the same. In addition, the speaker in the second embodiment,
As the planar shapes of the diaphragm 1b and the voice coil bobbin b, the track-shaped ones have been described, but the shapes are not limited thereto. For example, as shown in FIG.
It is also possible to consider the case where the diaphragm 1c, the edge 3c, the magnetic circuit 24, the frame 11c, and the like are provided, and a novel design which is not possible with a conventional speaker is possible. Further, the magnetic circuit is not limited to that of the above-mentioned embodiment, and it is sufficient that the air gap has a linear shape. Further, the shape of the diaphragm is not limited to that of the above embodiment, and may be, for example, a flat plate type diaphragm.

Next, the speaker of the third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a perspective view showing the structure of the voice coil bobbin 6c of the speaker of the third embodiment, and the other structures are the same as those of the speaker of the second embodiment. The shape of the voice coil bobbin 6c as viewed from the central axis direction is similar to that shown in FIG. 2A, and is a non-axisymmetrical shape having a major axis direction and a minor axis direction. However, unlike the second embodiment, the fold 31 is integrally formed on the voice coil bobbin 6c.

The elongated voice coil bobbin has a property of being easily deformed in the minor axis direction as compared with the circular type. If the voice coil bobbin is inadvertently deformed when assembling the speaker, it may cause a defect such as a gap (gap) rubbing. However, in this embodiment, since the pleats 31 are provided, the rigidity of the voice coil bobbin 6c is enhanced and the voice coil bobbin 6c is resistant to deformation. In addition, the speaker can be easily assembled, and defects can be prevented from occurring.

The shape of the voice coil bobbin 6c is not particularly limited as shown in FIG. The same effect can be obtained by forming or adhering ribs having a similar shape instead of the folds 31.

Next, a speaker according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a perspective view showing the configurations of the magnetic circuit 25 and the voice coil bobbin which are the driving portion of the speaker of the fourth embodiment. Other parts including the diaphragm and the frame are the same as those of the speaker of the second embodiment. Unlike the first to third embodiments, the magnetic circuit 25 is divided and provided in the major axis direction of the diaphragm.

As shown in FIG. 7B, one magnetic circuit 25 is composed of a yoke 8d, a magnet 9d and a plate 10d. The yoke 8d is a magnetic body formed in a groove shape, and its cross-sectional shape is U-shaped in the minor axis direction.
The magnet 9d attached to the upper part of the bottom surface of the yoke 8d is
It is a rectangular parallelepiped magnet magnetized in a direction parallel to the central axis of the diaphragm. The plate 10d is a member that generates a magnetic flux in a space facing the inner peripheral surface of the side surface of the yoke 8d, and is made of a magnetic material. For example, three sets of such magnetic circuits 25 are provided in the long axis direction of the diaphragm.

On the other hand, as shown in FIG. 7A, a reinforcing member 7 is fixed to the voice coil bobbin 6d. The shape of the voice coil bobbin 6d is similar to that shown in FIG. The reinforcing member 7 is, for example, a rectangular plate-shaped member made of paper,
It is bonded to the voice coil bobbin 6d so as to be located between the adjacent magnetic circuits 25.

In the speaker having such a structure, as in the third embodiment, the voice coil bobbin 6d is less likely to be deformed, so that the speaker can be easily assembled and defective assembly can be prevented. The shapes of the voice coil bobbin 6d and the magnetic circuit 25, and the reinforcing member 7 and the magnetic circuit 2
The number of 5 is not particularly limited as shown in FIG. 7.

Next, a speaker according to a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a perspective view showing the configuration of the diaphragm 1d in the speaker of the fifth embodiment. The vibrating plate 1d is the same as that shown in FIG. 2, and the cross-sectional shape in the minor axis direction is formed in a semicircular shape, and is uniform in the major axis direction except for its end portion. The surface of the end portion is bent spherically with respect to the edge.

A plurality of reinforcing members 2 are attached to the inner surface of the diaphragm 1d. The reinforcing member 2 is a semicircular plate member, and the edge thereof is bonded to the diaphragm 1d via an adhesive.

When the rigidity of the diaphragm is insufficient, a resonance mode may be generated from a low frequency in the direction of the minor axis, and nonlinear distortion due to bending vibration may occur. In the graph shown in FIG. 9, the graph indicated by the broken line A is the diaphragm 1 of the speaker shown in FIG.
Paper is used for b, and the weight is 0.6 g without using a reinforcing member.
2 shows the frequency characteristic of the second harmonic distortion in the case of. The measurement conditions are the same as in the case of FIG. In this case, it can be seen that high-level distortion occurs near 630 Hz and 1740 Hz because the rigidity of the diaphragm is insufficient.

The graph shown by the solid line B in FIG. 9 is the diaphragm 1d.
2 shows frequency characteristics of second harmonic distortion when the reinforcing member 2 is bonded to the back side of the. As shown in the figure, for example, harmonic distortion at a frequency of 100 Hz or higher is significantly reduced, the occurrence of resonance mode is suppressed, and the distortion level is 1
It was reduced by 0 dB or more.

In this embodiment, the case where the reinforcing member 2 is bonded to the back side of the diaphragm 1d has been described, but it is clear that the same effect can be obtained by bonding the reinforcing member 2 to the front side of the diaphragm.
Further, instead of adhering the reinforcing member 2 to the diaphragm 1d, the same effect can be obtained by forming a diaphragm having ribs using the same material as the diaphragm and the reinforcing member.

Next, a speaker according to a sixth embodiment of the present invention will be described with reference to FIGS. Figure 10
FIG. 11 is a perspective view showing the configurations of a diaphragm 1b and a support system in a speaker (No. 1) of the sixth embodiment. Diaphragm 1b
2 is a diaphragm having the same shape as that shown in FIG. 2, and is vibratably held by the frame 11d via an edge 3b fixed to the outer peripheral portion thereof.

Unlike the second embodiment, the diaphragm 1b of this embodiment is also held by the damper 4a via the connecting member 5a. The connecting member 5a is a plate-shaped member whose upper part is formed in a semicircular shape and whose lower part is formed in a rectangular shape.
A plurality of them are attached in the long axis direction. Further, the lower end of the connecting member 5a is fixed to the damper 4a,
It can vibrate integrally with the diaphragm 1b. Tamper 4
Similarly to the speaker of the conventional example, a has the other end fixed to the frame. In the damper 4a of this embodiment, the length of the corrugated portion along the frame is short, and one pair is provided for each connecting member 5a. The first to fifth
In the speaker of the embodiment, although the damper is not clarified, it is assumed that the damper is usually provided. However, when the vibration amplitude of the diaphragm is small, such as a tweeter for high-pitched sound reproduction, the damper is not necessary.

Now, in the conventional speaker as shown in FIG. 16,
A force acts also on the circumferential or elliptical damper in the circumferential direction as it moves up and down. Especially with a narrow damper, the stiffness becomes large. On the other hand, since the damper 4a of the present embodiment is linear, such a force does not work, and the stiffness can be reduced. As a result, the lowest resonance frequency f0 is suppressed to a low level, and it is possible to reproduce in the bass range.

The structure of the support system is not limited to this embodiment, and other structures can be considered and the same effect is obtained. FIG. 11 is a perspective view showing the configuration of the diaphragm 1b and the support system in the speaker (No. 2) of the sixth embodiment.
Here, the damper 4b is attached in parallel with the minor axis direction of the diaphragm 1b. The rest of the configuration including the diaphragm 1b is the same as that shown in FIG.

FIG. 12 is a speaker according to the sixth embodiment (part 3).
3 is a perspective view showing the configurations of the diaphragm 1b and the support system in FIG. In this figure, the damper 4c is mounted above the diaphragm 1b via a mounting member 12a. Mounting member 1
Reference numeral 2a is a U-shaped member, the lower end of which is fixed to the frame 11d. And the mounting member 12a
One end of the damper 4c is fixed to the upper surface of the
The connecting member 5c is held at the inner end of the. The rest of the configuration including the diaphragm 1b is the same as that shown in FIG.

Further, FIG. 13 is a perspective view showing the structure of the diaphragm 1b and the support system in the speaker (No. 4) of the sixth embodiment. In this figure, the damper 4d is mounted above the diaphragm 1b by combining two mounting members 12b. Unlike the one shown in FIG. 12, the mounting member 12
b is the frame 1 so as to straddle the front and opposite edges 3b
It is attached to 1d. And the two mounting members 12b
One end of the damper 4d is fixed to the upper surface of the damper 4d, and the connecting member 5d is held on the center line of the damper 4d. The shape of the connecting member 5d is the same as that shown in FIG. In addition,
Other configurations including the diaphragm 1b are the same as those shown in FIG.

In the sixth embodiment, the diaphragm 1b and the edge 3b are the same as those of the speaker of FIG. 2, but the shape is not limited to this.

Next, the speaker of the seventh embodiment of the present invention will be briefly described with reference to FIG. FIG. 14 is a perspective view showing the structure of the speaker of the seventh embodiment. Diaphragm 1b and supporting system components (edge 3b, damper 4)
a, the connecting member 5a, and the frame 11d) are the same as those in the sixth embodiment, and the description thereof is omitted. In this embodiment, the connecting member 5a is fixed to the diaphragm 1b and also to the voice coil bobbin 6d. By doing so, the effects of both embodiments can be obtained together without increasing the number of parts.

Finally, the speaker of the eighth embodiment of the present invention will be described with reference to FIG. FIG. 15 shows the eighth
Diaphragm 1b and edge 3d constituting the speaker of the embodiment
FIG. As shown in this figure, the diaphragm 1b has a track-like planar shape similar to that shown in FIG. 18, and an edge 3d is attached along the outer periphery thereof. The dimension of the edge 3d is, for example, 5 mm width in the straight line portion, but is wide in the portion where the radius of curvature of the diaphragm 1b is small, and is 12.5 mm at the maximum.

On the other hand, the edge 3f of the conventional example shown in FIG.
Then, the width is set to 5 mm regardless of the radius of curvature of the outer periphery of the diaphragm 1b. In the case of the edge 3f in FIG. 18, since a force in the circumferential direction acts on the curved portion along with the vertical movement thereof, the stiffness becomes larger than that of the straight portion. For example, when this edge is made of 0.25 mm thick cloth, the stiffness per 1 cm of the curved portion is 100 [N /
m], the stiffness per cm of the straight part is 36
[N / m] is calculated, and the increase of the stiffness of the entire edge is greatly influenced by the curved portion. Therefore, FIG.
By widening only the curved portion of the edge 3d as shown in 5, it is possible to reduce the stiffness of the edge 3d to some extent without changing the width of the speaker.

The stiffness of the edge 3f in FIG. 18 is 11
While 90 [N / m], the edge of this embodiment is 9
It becomes 20 [N / m]. As a result, the lowest resonance frequency f0 is reduced by 12%, and it becomes possible to reproduce lower tones.
In addition, although the track-shaped diaphragm and the edge are described in this embodiment, the invention is not particularly limited to this shape.

[0062]

As described above, according to the inventions of claims 1 to 4, the entire vibration system vibrates integrally by making the shape of the voice coil bobbin non-axisymmetric to the diaphragm. Therefore, split resonance in the major axis direction of the diaphragm is less likely to occur, and flat sound pressure frequency characteristics can be obtained in the mid-high range. Further, the wire length of the voice coil can be made considerably longer than that of the conventional one, and the volume of the magnet can be increased, so that the electromagnetic driving force of the diaphragm is increased. Therefore, the effect of improving the electroacoustic conversion efficiency is produced.

According to the inventions of claims 5 to 9 of the present application,
The rigidity of the diaphragm is increased by providing a reinforcing member for the diaphragm along the minor axis direction of the diaphragm or providing an arched rib. Therefore, the resonance mode in the minor axis direction of the diaphragm is less likely to occur, and reproduced sound with less distortion can be obtained.

According to the tenth to fourteenth aspects of the present invention, by providing the damper on the outer peripheral portion of the diaphragm, the stiffness of the vibration system can be suppressed lower than that of the conventional speaker unit. For this reason, the reproduction of the low frequency range becomes possible.

Further, according to the invention of claim 15 of the present application,
By providing an edge with a wide width in a portion where the radius of curvature of the diaphragm is small, it is possible to suppress the stiffness of the edge to be low as compared with the conventional speaker unit.
For this reason, the reproduction of the low frequency range becomes possible.

As described above, when the speaker of the present invention is attached to a horizontally long type television, the width of the television set is not widened and it is possible to output a sound with excellent sound quality together with the image.

[Brief description of drawings]

1A and 1B are views showing the structure of a speaker of a first embodiment of the invention, in which FIG. 1A is a plan view, FIG. 1B is a cross-sectional view in the major axis direction,
(C) is a cross-sectional view in the minor axis direction.

2A and 2B are views showing a structure of a speaker (No. 1) according to a second embodiment of the invention, in which (a) is a plan view, (b) is a cross-sectional view in the major axis direction, and (c) is a cross-section in the minor axis direction. It is a figure.

FIG. 3 is a frequency characteristic diagram of reproduced sound pressure level in the speaker of the second embodiment.

4A and 4B are views showing a structure of a speaker (No. 2) according to a second embodiment of the invention, in which (a) is a plan view, (b) is a cross-sectional view in the major axis direction, and (c) is a cross-section in the minor axis direction. It is a figure.

FIG. 5 is a plan view showing the structure of a speaker (No. 3) of the second embodiment of the present invention.

FIG. 6 is a perspective view showing the structure of a voice coil bobbin in the speaker of the third embodiment of the present invention.

FIG. 7 is a perspective view showing a configuration of a driving portion including a voice coil bobbin in the speaker of the fourth embodiment of the present invention.

FIG. 8 is a perspective view showing a configuration of a diaphragm of a speaker according to a fifth embodiment of the present invention.

FIG. 9 is a frequency characteristic diagram of second harmonic distortion in the speaker of the fifth example.

FIG. 10 is a perspective view showing a configuration of a diaphragm and a support system in a speaker (No. 1) of a sixth embodiment of the present invention.

FIG. 11 is a perspective view showing a configuration of a diaphragm and a support system in a speaker (No. 2) of the sixth embodiment of the present invention.

FIG. 12 is a perspective view showing a configuration of a diaphragm and a support system in a speaker (No. 3) of a sixth embodiment of the present invention.

FIG. 13 is a perspective view showing a configuration of a diaphragm and a support system in a speaker (Part 4) of the sixth embodiment of the present invention.

FIG. 14 is a perspective view showing a configuration of a diaphragm and a support system in a speaker according to a seventh embodiment of the present invention.

FIG. 15 is a plan view of a diaphragm and an edge of a speaker according to an eighth embodiment of the present invention.

FIG. 16 is a diagram showing a configuration example of a conventional speaker,
(A) is a plan view, (b) is a sectional view in the major axis direction, and (c) is a sectional view in the minor axis direction.

FIG. 17 is a frequency characteristic diagram of a reproduced sound pressure level in a speaker of a conventional example.

FIG. 18 is a plan view of a diaphragm and an edge of a conventional speaker.

[Explanation of symbols]

 1a to 1e Vibration plate 2,7 Reinforcing member 3a to 3f Edge 4a to 4e Damper 5a to 5d Connecting member 6a to 6e Voice coil bobbin 8a to 8e Yoke 9a to 9e Magnet 10a to 10e Plate 11a to 11e Frame 12a to 12b Mounting member 21 ~ 26 magnetic circuit 31 folds

Claims (15)

[Claims] 1. A vibrating plate having a non-axisymmetric shape having a major axis and a minor axis when viewed in a vibration direction and curved convexly in a sound radiating direction, and an outer peripheral portion of the vibrating plate. A voice coil bobbin formed along the outer periphery of the diaphragm, the voice coil bobbin being formed in a strip shape parallel to the vibration direction, and a voice coil wound around the outer peripheral surface of the voice coil bobbin; A magnetic circuit that gives a magnetic flux for vibration to the coil,
A speaker comprising: 2. A non-axisymmetric diaphragm having a major axis and a minor axis as viewed in the vibration direction and a non-axisymmetric diaphragm having a major axis and a minor axis as viewed in the vibration direction. A voice coil bobbin having at least a part of straight lines parallel to each other in the direction of the major axis and having an upper end bonded to the diaphragm; and a voice coil wound around the outer peripheral surface of the voice coil bobbin. A magnetic circuit for applying a vibration magnetic flux to the voice coil,
And a magnetic circuit driving the linear portion of the voice coil bobbin. 3. The magnetic circuit includes a yoke having a concave cross section, a magnet fixed to a bottom surface of the yoke, and a magnet fixed to an upper portion of the magnet and opposed to an inner surface of the yoke via a gap. 3. The speaker according to claim 1, wherein the magnet is magnetized in a vibration direction of the diaphragm. 4. The magnetic circuit is fixed to one inner side surface of the yoke, the yoke having a concave cross section, and opposes the other inner side surface of the yoke via a gap. 3. A magnet magnetized in a direction perpendicular to the vibration direction, wherein two sets of the magnetic circuits are provided with a central axis of a major axis of the diaphragm as a symmetry axis. Speaker. 5. A non-axisymmetric diaphragm having a major axis and a minor axis as viewed in the vibration direction, a voice coil bobbin adhered to the diaphragm, and a coil wound around an outer peripheral surface of the voice coil bobbin. A voice coil, and a magnetic circuit for applying a vibration magnetic flux to the voice coil,
The voice coil bobbin has a fold formed by integrally forming a linear protrusion parallel to the outer peripheral portion of the diaphragm at an upper end portion formed in a strip shape parallel to the vibration direction. Characteristic speaker. 6. A non-axisymmetric diaphragm having a planar shape viewed from the vibration direction having a major axis and a minor axis, a voice coil bobbin bonded to the diaphragm, and a coil wound around an outer peripheral surface of the voice coil bobbin. A voice coil, and a magnetic circuit for applying a vibration magnetic flux to the voice coil,
The voice coil bobbin is characterized in that a rib having a linear protrusion parallel to an outer peripheral portion of the diaphragm is provided on an upper end portion formed in a belt shape in parallel with a vibration direction. Speaker. 7. A non-axisymmetric diaphragm having a major axis and a minor axis as viewed in a vibration direction, a voice coil bobbin adhered to the diaphragm, and a coil wound around an outer peripheral surface of the voice coil bobbin. A voice coil, and a magnetic circuit for applying a vibration magnetic flux to the voice coil,
The voice coil bobbin includes a thin plate-shaped reinforcing member stretched between the surfaces of the diaphragm facing each other in the minor axis direction in parallel with the vibration direction of the diaphragm and at a right angle to the facing surface. A speaker having a plurality of the magnetic circuits, wherein a plurality of the magnetic circuits are provided via a certain space so as to sandwich the reinforcing member in a vibrating manner. 8. A non-axisymmetric diaphragm having a plane shape viewed from the vibration direction having a major axis and a minor axis, a voice coil bobbin bonded to the diaphragm, and a coil wound around an outer peripheral surface of the voice coil bobbin. A voice coil, and a magnetic circuit for applying a vibration magnetic flux to the voice coil,
The speaker is characterized in that the diaphragm has an arcuate thin plate reinforcing member that is joined to an inner surface of the diaphragm in a minor axis direction of the diaphragm. 9. A non-axisymmetric diaphragm having a major axis and a minor axis as viewed in the vibration direction, a voice coil bobbin adhered to the diaphragm, and a coil wound around the outer peripheral surface of the voice coil bobbin. A voice coil, and a magnetic circuit for applying a vibration magnetic flux to the voice coil,
The speaker is characterized in that the diaphragm is one in which arc-shaped ribs coupled to the inner surface of the diaphragm in the minor axis direction of the diaphragm are integrally formed with the diaphragm. . 10. A vibrating plate, which has a non-axisymmetric shape having a major axis and a minor axis when viewed in a vibration direction and is curved in a convex shape in a sound radiating direction, and an outer peripheral portion of the vibrating plate. An edge having elasticity for holding the diaphragm in a vibrating manner, and a strip along the outer periphery of the diaphragm parallel to the vibration direction. A voice coil bobbin adhered to the outer peripheral surface of the plate, a voice coil wound around the outer peripheral portion of the voice coil bobbin, a magnetic circuit that applies a magnetic flux for vibration to the voice coil, and a voice coil provided in the minor axis direction of the diaphragm. A thin plate-like connecting member that is joined to the inner surface of the diaphragm; a damper that holds the lower end of the connecting member in a vibrating manner and that is provided with an elastic member that is parallel to the edge; and an outer peripheral portion of the edge. , The magnetic circuit, in front Speaker characterized by comprising a frame for holding the damper, the. 11. A vibrating plate, which has a non-axisymmetric shape having a major axis and a minor axis in a plan view when viewed from the vibration direction, and is curved in a convex shape in a sound radiating direction, and an outer peripheral surface of the vibrating plate. An edge having elasticity for holding the diaphragm in a vibrating manner, and a strip along the outer periphery of the diaphragm parallel to the vibration direction. A voice coil bobbin adhered to the outer peripheral portion of the plate, a voice coil wound around the outer peripheral surface of the voice coil bobbin, a magnetic circuit for giving a magnetic flux for vibration to the voice coil, and provided in the minor axis direction of the diaphragm. A thin plate-like connecting member that is joined to the inner surface of the diaphragm, and a damper that holds the lower end side of the connecting member so that it can vibrate and that is provided with an elastic member that is parallel to the minor axis direction of the diaphragm. The outer periphery of the edge, the magnetic Circuit, a speaker, characterized by comprising a frame for holding the damper. 12. A vibrating plate, which has a non-axisymmetric shape having a major axis and a minor axis when viewed in a vibration direction and is curved in a convex shape in a sound radiating direction, and an outer peripheral portion of the vibrating plate. An edge having elasticity for holding the diaphragm in a vibrating manner, and a strip along the outer periphery of the diaphragm parallel to the vibration direction. A voice coil bobbin adhered to the outer peripheral portion of the plate, a voice coil wound around the outer peripheral surface of the voice coil bobbin, a magnetic circuit for giving a magnetic flux for vibration to the voice coil, and provided in the minor axis direction of the diaphragm. A thin plate-shaped connecting member that is joined to the outer surface of the diaphragm; a damper that vibratably holds the upper end of the connecting member and that is parallel to the edge; and a damper that is provided on the outer peripheral portion of the edge. Mounting to hold And wood, the outer peripheral portion of said edge, said magnetic circuit, a speaker, characterized by comprising a frame for holding said mounting member. 13. A vibrating plate, which has a non-axisymmetric shape having a major axis and a minor axis when viewed in a vibration direction and is curved in a convex shape in a sound radiating direction, and an outer peripheral portion of the vibrating plate. An edge having elasticity for holding the diaphragm in a vibrating manner, and a strip along the outer periphery of the diaphragm parallel to the vibration direction. A voice coil bobbin adhered to the outer peripheral portion of the plate, a voice coil wound around the outer peripheral surface of the voice coil bobbin, a magnetic circuit for giving a magnetic flux for vibration to the voice coil, and provided in the minor axis direction of the diaphragm. And a thin plate-like connecting member that is joined to the outer surface of the diaphragm, a damper that holds the upper end of the connecting member in a freely vibrating manner, and a damper that is parallel to the minor axis direction of the diaphragm, and that straddles the diaphragm. Provided between the outer periphery of the edge Is a mounting member for holding the damper, the outer peripheral portion of said edge, said magnetic circuit, a speaker, characterized by comprising a frame for holding said mounting member. 14. A vibrating plate, which has a non-axisymmetric shape having a major axis and a minor axis when viewed in a vibration direction and is curved in a convex shape in a sound radiating direction, and an outer peripheral portion of the vibrating plate. An edge having elasticity for holding the diaphragm in a vibrating manner, and a strip along the outer periphery of the diaphragm parallel to the vibration direction. A voice coil bobbin adhered to the outer peripheral portion of the plate, a voice coil wound around the outer peripheral surface of the voice coil bobbin, a magnetic circuit for giving a magnetic flux for vibration to the voice coil, and provided in the minor axis direction of the diaphragm. A thin plate-like connecting member that is joined to the inner surface of the diaphragm and the inner surface of the voice coil bobbin; a damper that holds the lower end of the connecting member in a vibrating manner and that is parallel to the major axis direction of the diaphragm; Outside the edge Parts, the magnetic circuit, a speaker, characterized by comprising a frame for holding the damper. 15. A vibrating plate having a non-axisymmetric shape having a long diameter and a short diameter in a plan view when viewed from the vibration direction, and joined in a strip shape along the outer peripheral portion of the vibrating plate so that the vibrating plate can vibrate. An edge to be held, a voice coil bobbin adhered to the diaphragm, a voice coil wound around an outer peripheral surface of the voice coil bobbin, a magnetic circuit for giving a magnetic flux for vibration to the voice coil,
The speaker is characterized in that, in the edge, the width of the edge is wider in a portion where the outer peripheral portion of the diaphragm is arcuate than in a portion where the outer peripheral portion is linear.