JP3139915B2 - Speaker - Google Patents

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 spread of so-called high-definition televisions and wide-vision televisions, television screens have become generally landscape. 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 contributes to increase the width of the television set. For this reason, speakers having an elongated structure such as a square or an ellipse have conventionally been used for televisions. In addition, as the width of the cathode ray tube becomes longer, the width of the speaker is required to be further reduced, and at the same time, the sound quality of the sound corresponding to the higher image quality of the screen is required.

Here, a conventional elongated 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 cross-sectional view in a long diameter direction, and FIG. 16C is a cross-sectional view in a short diameter direction. In this figure, a diaphragm 1e is an elongated diaphragm that generates air vibration and has, for example, dimensions as shown in FIG. An edge 3e is joined to the outer peripheral portion of the diaphragm 1e, and is held by the frame 11e.

[0005] A voice coil bobbin 6e is fixed to the center of the diaphragm 1e, and is connected to the frame 11 via a damper 4e.
e to be able to vibrate freely. On the other hand, the frame 11e
In the central concave portion, a yoke 8e, a magnet 9e, a plate 10
A magnetic circuit 26 made of e is provided. The voice coil wound around the voice coil bobbin 6e is held in the gap of the magnetic circuit 26, and the driving coil causes the voice coil bobbin 6e to perform a piston motion, so that the diaphragm 1e vibrates in that direction. As a result, a sound wave is emitted from the diaphragm 1e.

FIG. 17 shows the frequency characteristic of the reproduced sound pressure level of this speaker. The vertical axis indicates the reproduced sound pressure level at a point 1 m on the front axis when 1 W is input to the speaker. The axis indicates the driving frequency.

[0007]

However, the conventional speaker as described above has the following problems.
That is, in the loudspeaker shown in FIG. 16, since the center of the elongated diaphragm 1e is point-driven, split resonance in the major axis direction is likely to occur. As a result, a peak dip occurs in the frequency characteristic of the reproduced sound pressure in the middle and high frequency ranges, resulting in deterioration of sound quality. For example, on the characteristic shown in FIG.
Noticeable 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 must 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 line length L of the voice coil cannot be increased. In addition, since the volume of the magnet 9e is limited to a small volume, the magnetic flux density B of the air gap cannot be sufficiently secured. As a result, the force coefficient of the drive system (B × L)
Was small, and it was difficult to increase the conversion efficiency. Further, it is necessary to reduce both the radius of curvature and the width of the damper 4e so as to fit inside the frame 11e.
As a result, there is a disadvantage that the stiffness of the vibration system is increased, the lowest resonance frequency f0 is increased, and it is difficult to reproduce a low sound range.

The present invention has been made in view of such a conventional problem, and has a narrow width (elongated structure).
It is an object of the present invention to provide a speaker with excellent sound quality, in which split resonance is less likely to occur, a flat frequency characteristic is obtained, conversion efficiency is increased, and resonance frequency f0 is suppressed to a low level, thereby enabling reproduction in a low frequency range.

[0010]

According to the first aspect of the present invention, the planar shape viewed from the vibration direction has a major axis and a minor axis.
Non-axisymmetric, curved convexly in the direction of sound emission
And a voice coil body bonded to the diaphragm.
Bin, wound around the outer peripheral surface of the voice coil bobbin
Applying a magnetic flux for vibration to the voice coil and the voice coil;
A magnetic circuit, wherein the diaphragm is the diaphragm
The upper end joined to the inner surface of the diaphragm in the minor diameter direction is circular.
Characterized by having an arc-shaped thin plate reinforcing member
is there.

[0011] The invention of claim 2 of the present application is the spin-up device of claim 1.
The diaphragm is formed integrally with the reinforcing member.
It is characterized by being shaped.

The invention according to claim 3 of the present application is directed to the apparatus viewed from the vibration direction.
The planar shape is a non-axisymmetric shape having a major axis and a minor axis.
And a diaphragm curved convexly in the direction in which sound is emitted.
The diaphragm is joined in a strip shape along the outer periphery of the diaphragm,
An edge having elasticity for holding the vibration freely, and the vibration
It is formed in a belt shape along the outer periphery of the plate in parallel with the vibration direction,
A void whose upper end is adhered to the outer peripheral surface of the diaphragm;
Scoil bobbin and the outer periphery of the voice coil bobbin
The wound voice coil and the voice coil for vibration
A magnetic circuit for applying a magnetic flux of
A thin plate-shaped connecting member joined to the diaphragm,
A damper for holding the connecting member so as to be able to vibrate;
Holds the outer periphery of the cartridge, the magnetic circuit, and the damper
And a frame.

[0013] The invention of claim 4 of the present application is the invention of claim 3
The connecting member is provided on an inner surface of the diaphragm.
The end is a member to be joined, and the damper is a connecting member
To hold the lower end of the
A characteristic member is provided.

[0015] The invention of claim 5 of the present application is the invention according to claim 3.
The connecting member is provided on an inner surface of the diaphragm.
The end is a member to be joined, and the damper is a connecting member
Vibrating the lower end of
Characterized in that parallel elastic members are provided.
is there.

[0015] The invention of claim 6 of the present application is the invention of claim 3
The connecting member is in contact with an outer surface of the diaphragm.
A thin plate-shaped member to be combined, wherein the damper is
The upper end of the material is held so that it can vibrate freely and is parallel to the edge
And the speaker is provided on an outer peripheral portion of the edge.
And a mounting member for holding the damper.
The frame is attached to the outer peripheral portion of the edge and the magnetic circuit.
And holding the mounting member.
is there.

[0016] The invention of claim 7 of the present application is the invention of claim 3.
The connecting member is in contact with an outer surface of the diaphragm.
A thin plate-shaped member to be joined, wherein the damper is
The upper end of the binding member is held so as to freely vibrate, and the minor axis of the diaphragm is
The speaker is parallel to the vibration direction.
The edge is provided between the outer peripheral portions of the edges so as to
A mounting member for holding the damper, wherein the frame comprises:
The outer peripheral portion of the edge, the magnetic circuit, and the mounting member are retained.
It is characterized by having.

The invention of claim 8 of the present application is the invention of claim 3
In the car, the connecting member includes an inner surface of the diaphragm and
A thin plate-shaped part to be joined to the inner surface of the voice coil bobbin
The damper swings the lower end of the connecting member.
Movably held, parallel to the major axis direction of the diaphragm
It is characterized by the following.

The invention of claim 9 of the present application is directed to claim 1 or 2
Wherein the magnetic circuit has a concave cross section.
The yoke formed and affixed to one inner surface of the yoke.
And opposed to the other inner surface of the yoke via a gap,
A magnet magnetized in a direction perpendicular to the vibration direction of the diaphragm,
Wherein the magnetic circuit is the length of the diaphragm.
Two sets are provided with the center axis of the diameter as the axis of symmetry.
Is what you do.

The invention of claim 10 of the present application is directed to
Vibration of non-axisymmetric type whose viewed planar shape has a major axis and a minor axis
A plate, a voice coil bobbin bonded to the diaphragm,
The voice coil wound around the outer peripheral surface of the voice coil bobbin
And a magnet that provides a magnetic flux for vibration to the voice coil.
A voice coil bobbin.
The upper end formed in a strip shape in parallel with the
It has folds in which linear projections parallel to the periphery are integrally formed
It is characterized by that.

The invention of claim 11 of the present application is directed to claims 3 to 7
4. The speaker according to claim 1, wherein the edge is
Where the outer peripheral portion of the diaphragm has an arc shape, the outer peripheral portion is straight.
The width of the edge is wider than that of a linear portion.
It is a sign.

[0021]

[0022]

[0023]

[0024]

According to the present invention having the above features ,
According to 9,10 invention, by the shape of the voice coil bobbin and the same non-axisymmetric and the diaphragm, the entire diaphragm is driven. Therefore, split resonance in the major axis direction is less likely to occur. Furthermore, the wire length of the voice coil is considerably longer than that of the conventional voice coil, and the volume of the magnet can be increased, so that the driving force increases. Also along the minor axis direction of the diaphragm
Gluing the reinforcing member or molding the reinforcing member integrally
Thereby, the rigidity of the diaphragm is increased.

According to the third to eighth aspects of the present invention,
Parallel to the edge or parallel to the minor axis direction of the diaphragm
Low stiffness of vibration system due to provision of damper
It becomes.

Further, according to the invention of claim 11 of the present application,
In the portion of the outer periphery of the diaphragm where the radius of curvature is small,
The width of the chair is widened. Because of this, the stiffness of the edge
And the low-frequency range can be reproduced.

[0027]

[0028]

DETAILED 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, in which FIG. 1A is a plan view, FIG. 1B is a cross-sectional view in a major axis direction, and FIG. 1C is a sectional view in a minor axis direction. In this figure, a diaphragm 1a is a substantially elliptical diaphragm, and is a non-axially symmetric (non-rotationally symmetric) type having a major axis direction and a minor axis direction as shown in FIGS. 1 (b) and 1 (c). ,
It has a bulge toward the vibration direction. An edge 3a is joined to the outer peripheral portion of the diaphragm 1a,
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 belt shape along the outer periphery of the diaphragm 1a. Unlike the speaker of the conventional example, 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 thereof is adhered to the diaphragm 1a, and the lower end is wound around a voice coil (not shown).

The frame 11a is formed in a box shape, the side surface of which is bent elliptical along the edge 3a, and the bottom surface is in the shape of an elliptic plate. A yoke 8a and a magnet 9 for forming the magnetic circuit 21 are provided on the bottom surface of the frame 11a.
a, plate 10a is attached. The yoke 8a is a box-shaped magnetic material like the frame 11a, and has a U-shaped cross section in both the short axis direction and the long axis direction. The magnet 9a attached to the upper portion 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 portion 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 portion of the side surface of the yoke 8a.

In the loudspeaker thus configured, since the diaphragm 1a has a bulge in the direction of the center axis, the rigidity of the diaphragm 1a is improved. Further, since the entire diaphragm 1a receives the driving force integrally, the split resonance in the long axis direction is less likely to be excited, and a flat frequency characteristic in a middle and high frequency range is obtained. 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 made large, so that the driving force becomes large and the conversion efficiency can be increased. In this embodiment, the case where the planar shape of the diaphragm 1a and the magnetic circuit 21 is elliptical has been described, but the shape is not limited to this.

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 a structure of a speaker (No. 1) of the second embodiment,
(A) is a plan view, (b) is a cross-sectional view in a long diameter direction, and (c) is a cross-sectional view in a short diameter direction, which is twice as large. FIG.
In FIG. 2, a diaphragm 1b is a substantially track-shaped diaphragm which generates air vibration, and is a non-axially symmetric type having a major axis direction and a minor axis direction as shown in FIGS. 2 (b) and 2 (c). It has a semi-cylindrical bulge toward. An edge 3b is joined to the outer peripheral portion of the diaphragm 1b,
1b.

As in the first embodiment, the edge 3b is a member having an arc-shaped cross section, and is formed in a belt 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 shape of the voice coil bobbin 6b is such that a sheet-like member is formed in a band shape along the outer periphery of the diaphragm 1b. You.

The frame 11b is formed in a box shape, the side surface thereof is bent in a rectangular shape along the edge 3b, and the bottom surface is rectangular. 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 direction of the central axis of the diaphragm 1b.

In the speaker configured as described above,
Since the voice coil bobbin 6b is driven integrally as in the first embodiment, the split resonance in the long axis direction of the diaphragm 1b is less likely to be excited. FIG. 3 shows the measured frequency characteristics of the loudspeaker of the present embodiment under the same conditions as in FIG. Here, as compared with the characteristics of FIG. 17, it is understood that the peak dip in the middle and high ranges is eliminated, and a flat frequency characteristic is obtained in the middle and high ranges. Further, the lowest resonance frequency f0 is 180 Hz in FIG. 17 and is greatly reduced to 100 Hz in FIG. 3, so that reproduction in a lower sound range is possible. Further, since the magnetic circuit 22 has a linear shape, the members constituting the magnetic circuit can be easily manufactured, which is excellent in mass productivity.

FIGS. 4A and 4B are diagrams showing a configuration of a speaker (No. 2) according to a second embodiment of the present invention. FIG. 4A is a plan view, FIG. 4B is a cross-sectional view in the major axis direction, and FIG. It is sectional drawing of a minor diameter direction, and is expanding 2 times. The same parts as those of the speaker in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted. FIG.
As shown in (c), the magnetic circuit 23
Divided into pairs. The magnetic circuit 23 includes a yoke 8c having a U-shaped cross section, and a magnet 9c attached to a side of the yoke 8c closer to the center 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 loudspeaker thus configured is different from the loudspeaker of FIG. 2 in the configuration of the magnetic circuit, but the operation and the effect are the same. The speaker in the second embodiment is
The planar shape of the diaphragm 1b and the voice coil bobbin b has been described as a track shape, but the shapes are not limited thereto. For example, as shown in FIG.
It is also possible to consider a case having a vibrating plate 1c, an edge 3c, a magnetic circuit 24, and a frame 11c in a letter shape, and a novel design not available in a conventional speaker is possible. Further, the magnetic circuit is not limited to that of the above-described embodiment, and it is sufficient that the air gap has a linear shape. Further, the shape of the diaphragm is not limited to the above-described embodiment, and may be, for example, a flat plate-type diaphragm.

Next, a speaker according to a 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 structure is the same as that of the speaker of the second embodiment. The shape of the voice coil bobbin 6c as viewed from the center axis direction is the same as that shown in FIG. 2A, and is a non-axially symmetric shape having a major axis direction and a minor axis direction. However, unlike the second embodiment, the pleats 31 are formed integrally with the upper part of the voice coil bobbin 6c.

An elongated voice coil bobbin has the property of being more easily deformed in the short diameter direction than a circular one. If the voice coil bobbin is inadvertently deformed at the time of assembling the loudspeaker, it may cause defects such as gap rubbing. However, in this embodiment, since the folds 31 are provided, the rigidity of the voice coil bobbin 6c is increased, and the voice coil bobbin 6c is resistant to deformation. In addition, assembling of the speaker becomes easy, and occurrence of defects can be prevented.

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 bonding 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 a configuration of a magnetic circuit 25 and a voice coil bobbin which are driving portions of the speaker of the fourth embodiment. Other parts including the diaphragm and the frame are the same as the speaker of the second embodiment. Unlike the first to third embodiments, a magnetic circuit 25 is provided separately in the longitudinal direction of the diaphragm.

As shown in FIG. 7B, one magnetic circuit 25 includes a yoke 8d, a magnet 9d, and a plate 10d. The yoke 8d is a magnetic body formed in a groove shape, and has a U-shaped cross section in the short axis direction.
The magnet 9d attached to the upper part of the bottom 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 gap facing the inner peripheral portion 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 longitudinal 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 the same as that shown in FIG. The reinforcing member 7 is, for example, a rectangular plate member made of paper,
It is adhered to the voice coil bobbin 6d so as to be located between the adjacent magnetic circuits 25.

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

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 a configuration of a diaphragm 1d in the speaker of the fifth embodiment. The vibration plate 1d is the same as that shown in FIG. 2, and has a semi-circular cross section in the short axis direction, and is made uniform in the long axis direction except for the terminal end thereof. Note that the surface of the terminal end portion is bent spherically with respect to the edge.

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

When the rigidity of the diaphragm is insufficient, a resonance mode is generated in a short diameter direction from a low frequency, and a nonlinear distortion due to bending vibration may be generated. In the graph shown in FIG. 9, the graph shown by the broken line A is the diaphragm 1 of the speaker shown in FIG.
Using paper for b and weighing 0.6 g without using reinforcing members
7 shows the frequency characteristic of the second harmonic distortion in the case where. The measurement conditions are the same as in FIG. In this case, it can be seen that high-level distortion occurs around 630 Hz and 1740 Hz due to insufficient rigidity of the diaphragm.

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

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

Next, a speaker according to a sixth embodiment of the present invention will be described with reference to FIGS. FIG.
FIG. 19 is a perspective view showing a configuration of a diaphragm 1b and a support system in a speaker (part 1) of a sixth embodiment. Diaphragm 1b
Is a diaphragm having the same shape as that shown in FIG. 2, and is vibratably held on the frame 11d via an edge 3b fixed to the outer peripheral portion.

The vibration plate 1b of this embodiment is different from that of the second embodiment and is also held by a damper 4a via a connecting member 5a. The connecting member 5a is a plate-like member having an upper portion formed in a semicircular shape and a lower portion formed in a rectangular shape.
Are mounted in the long axis direction. Further, the lower end of the connecting member 5a is fixed to the damper 4a,
It can freely vibrate integrally with the diaphragm 1b. Tamper 4
“a” has the other end fixed to the frame similarly to the conventional speaker. In the damper 4a of the present embodiment, the length of the corrugated portion along the frame is short, and one pair is provided for each connecting member 5a. In addition, the first to fifth
In the loudspeaker of the embodiment, the damper has not been clarified, but it is assumed that a damper is usually provided. However, when the amplitude of the diaphragm is small, as in a tweeter for reproducing high-pitched sounds, the damper is not required.

Now, in a conventional speaker as shown in FIG.
A force is also exerted on the circumferential or elliptical damper in the circumferential direction with the vertical movement. Particularly with a narrow damper, the stiffness increases. 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 kept low, and reproduction in a low sound range becomes possible.

The structure of the support system is not limited to the present embodiment, but 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 (part 2) of the sixth embodiment.
Here, the damper 4b is attached in parallel with the minor axis direction of the diaphragm 1b. The other configuration including the diaphragm 1b is the same as that shown in FIG.

FIG. 12 shows a speaker according to the sixth embodiment (part 3).
3 is a perspective view showing a configuration of a diaphragm 1b and a support system. In this figure, the damper 4c is mounted above the diaphragm 1b via the mounting member 12a. Mounting member 1
Reference numeral 2a denotes 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 damper 4c.
The connecting member 5c is held at the inner end of the. The other configuration including the diaphragm 1b is the same as that shown in FIG.

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 drawing, the damper 4d is mounted above the diaphragm 1b with two mounting members 12b as a set. Unlike the one shown in FIG.
b is the frame 1 so as to straddle the front edge 3b
1d. And two mounting members 12b
One end of a damper 4d is fixed to the upper surface of the damper 4d, and a connecting member 5d is held at 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 same diaphragm as the speaker shown in FIG. 2 is used as the diaphragm 1b and the edge 3b, but the shape is not limited to this.

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

Finally, a speaker according to an eighth embodiment of the present invention will be described with reference to FIG. FIG.
Diaphragm 1b and edge 3d constituting speaker of embodiment
FIG. As shown in the figure, the planar shape of the diaphragm 1b is a track shape like the one shown in FIG. 18, and an edge 3d is attached along the outer periphery. The dimension of the edge 3d is, for example, 5 mm wide in a straight portion, but wide in a 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 conventional edge 3f shown in FIG.
Has a width of 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 circumferential force 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], and the stiffness per 1 cm of the linear portion is 36.
[N / m], and the stiffness increase of the entire edge is greatly affected by the curved portion. Therefore, FIG.
By expanding the width of only the curved portion of the edge 3d as shown in 5, the stiffness of the edge 3d can be reduced to some extent without changing the width of the speaker.

The stiffness of edge 3f in FIG. 18 is 11
90 [N / m], whereas the edge of this embodiment is 9
20 [N / m]. As a result, the lowest resonance frequency f0 is reduced by 12%, and lower-pitched sound can be reproduced.
In the present embodiment, the track-shaped diaphragm and the edge have been described. However, the present invention is not particularly limited to this shape.

[0061]

As described above, claims 1, 2, 9, 9
According to the tenth aspect , by making the shape of the voice coil bobbin non-axially symmetric with the diaphragm, the entire vibration system vibrates integrally. Therefore, split resonance in the major axis direction of the diaphragm is less likely to occur, and a flat sound pressure frequency characteristic in a middle to high range is obtained. Furthermore, the wire length of the voice coil can be considerably longer than the conventional one, and the volume of the magnet can be increased.
The electromagnetic driving force of the diaphragm increases. For this reason, there is an effect that the electroacoustic conversion efficiency is improved. Also the minor diameter of the diaphragm
Provide a reinforcing member for the diaphragm along the direction
By integrally forming, the rigidity of the diaphragm is increased.
For this reason, a resonance mode in the minor axis direction of the diaphragm hardly occurs.
Thus, a reproduced sound with little distortion can be obtained.

According to the third to eighth aspects of the present invention,
By providing a damper on the outer periphery of the diaphragm,
Lower stiffness of vibration system compared to speaker unit
Can be suppressed. As a result, bass reproduction is more effective.
Layering becomes possible.

Further, according to the invention of claim 11 of the present application,
Edge where the radius of curvature of the diaphragm becomes smaller becomes wider
By installing the speaker, compared to the conventional speaker unit
Thus, edge stiffness can be suppressed to a low level.
For this reason, the reproduction of the low-frequency range becomes further possible.

As described above, the speaker of the present invention is
When installed on a TV set, the width of the TV set is wide
Instead, it can output high quality sound along with the video.
Wear.

[0065]

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a structure of a speaker according to a first embodiment of the present invention, wherein FIG. 1A is a plan view, FIG.
(C) is a sectional view in the minor axis direction.

FIGS. 2A and 2B are diagrams showing a structure of a speaker (No. 1) according to a second embodiment of the present invention, wherein FIG. 2A is a plan view, FIG. 2B is a cross-sectional view in a major axis direction, and FIG. FIG.

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

FIGS. 4A and 4B are diagrams showing a structure of a speaker (part 2) according to a second embodiment of the present invention, wherein FIG. 4A is a plan view, FIG. 4B is a cross-sectional view in a major axis direction, and FIG. FIG.

FIG. 5 is a plan view showing a structure of a speaker (part 3) according to a second embodiment of the present invention.

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

FIG. 8 is a perspective view showing a configuration of a diaphragm in 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 embodiment.

FIG. 10 is a perspective view showing a configuration of a diaphragm and a support system in a speaker (part 1) according to 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 (part 2) according to a 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 (part 3) according to 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) according to a 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 edges in 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 a major axis direction, and (c) is a sectional view in a minor axis direction.

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

FIG. 18 is a plan view of a diaphragm and edges in a conventional speaker.

[Explanation of symbols]

 1a-1e Diaphragm 2,7 Reinforcement member 3a-3f Edge 4a-4e Damper 5a-5d Connection member 6a-6e Voice coil bobbin 8a-8e Yoke 9a-9e Magnet 10a-10e Plate 11a-11e Frame 12a-12b Mounting member 21 ~ 26 magnetic circuit 31 fold

──────────────────────────────────────────────────の Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04R 9/02 102 H04R 7/12 H04R 9/04 102 H04R 9/04 104 H04R 9/06

Claims (11)

(57) [Claims] 1. A planar shape viewed from the vibration direction has a major axis and a minor axis.
And is convex in the direction of radiating sound.
A diaphragm, a voice coil bobbin adhered to the diaphragm, and a voice coil wound around the outer peripheral surface of the voice coil bobbin.
And a magnetic circuit that provides a magnetic flux for vibration to the voice coil;
Comprising a, the diaphragm, the is joined to the inner surface of the vibration plate in minor axis of the diaphragm
The upper end shall have an arc-shaped thin plate reinforcing member.
A speaker characterized by the following. 2. The vibration plate is formed integrally with the reinforcing member.
The speaker according to claim 1, wherein 3. The planar shape viewed from the vibration direction has a major axis and a minor axis.
And is convex in the direction of radiating sound.
A diaphragm that is curved in a shape, and is joined in a belt shape along an outer peripheral portion of the diaphragm,
An edge having elasticity for holding the plate so as to freely vibrate, and a belt-like shape along the outer peripheral portion of the diaphragm parallel to the vibration direction;
And the upper end of the band is adhered to the outer peripheral surface of the diaphragm.
Voice coil bobbin, and a voice coil wound around the outer periphery of the voice coil bobbin.
And a magnetic circuit for providing a magnetic flux for vibration to the voice coil, and a magnetic circuit provided in the minor axis direction of the diaphragm, and joined to the diaphragm.
A thin plate-shaped connecting member, a damper for holding the connecting member in a vibrating manner, and an outer peripheral portion of the edge, the magnetic circuit, and the damper.
And a frame to be carried.
Mosquito. 4. The connecting member is provided on an inner surface of the diaphragm.
The end is a member to be joined, and the damper holds the lower end of the connecting member so as to be able to vibrate freely.
And an elastic member parallel to the edge is provided.
The speaker according to claim 3, wherein the speaker is provided. 5. The connecting member is provided on an inner surface of the diaphragm.
The end is a member to be joined, and the damper holds the lower end of the connecting member so as to be able to vibrate freely.
And an elastic member parallel to the minor axis direction of the diaphragm is provided.
4. The speaker according to claim 3, wherein
Mosquito. 6. The connecting member is in contact with an outer surface of the diaphragm.
The damper holds the upper end of the connecting member in a vibrating manner.
The speaker is parallel to the edge, and the speaker is provided on an outer peripheral portion of the edge.
A mounting member for holding a damper, wherein the frame is provided on an outer peripheral portion of the edge, on the magnetic circuit.
In addition, it is characterized by holding the mounting member.
The speaker according to claim 3, wherein 7. The connecting member is in contact with an outer surface of the diaphragm.
The damper is configured to vibrate the upper end of the connecting member so as to freely vibrate.
The speaker is parallel to the minor axis direction of the diaphragm, and the speaker is outside the edge so as to straddle the diaphragm.
A mounting member provided between the peripheral portions and holding the damper
Comprising, the frame has an outer peripheral portion of the edge, the magnetic circuit,
A holder for holding the mounting member.
The speaker according to claim 3. 8. The connecting member includes : an inner surface of the diaphragm;
A thin plate-shaped part to be joined to the inner surface of the voice coil bobbin
The damper is configured to vibrate the lower end of the connecting member so as to freely vibrate.
That are parallel to the major axis direction of the diaphragm
The speaker according to claim 3, wherein: 9. A magnetic circuit comprising : a yoke having a concave cross-section; and a magnetic circuit fixed to one inner surface of the yoke.
Opposing the inner surface of the diaphragm via a gap, and
Monodea comprising a magnetized magnet direction perpendicular directions, the
The magnetic circuit uses the central axis of the major axis of the diaphragm as a symmetric axis.
3. The method according to claim 1, wherein two sets are provided.
Speaker. 10. A planar shape viewed from the vibration direction has a major axis and a minor axis.
A non-axisymmetric diaphragm having a diameter, a voice coil bobbin adhered to the diaphragm, and a voice coil wound around an outer peripheral surface of the voice coil bobbin.
And a magnetic circuit that provides a magnetic flux for vibration to the voice coil;
The voice coil bobbin has an upper end formed in a belt shape parallel to the vibration direction,
A fold in which linear projections parallel to the outer periphery of the plate are integrally formed
A speaker comprising: 11. The edge has an outer peripheral portion of the diaphragm.
In the arc-shaped part, the outer peripheral part is
The width of the edge is increased.
8. The speaker according to claim 7.