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JP2003032786

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DESCRIPTION JP2003032786
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used for various types of audio equipment, and more particularly to a speaker having a
rectangular and elongated structure.
[0002]
2. Description of the Related Art In high-definition televisions such as high-definition televisions
with wide screens, rectangular or elliptical speakers are generally used due to the relationship
between the shape of the case and space, but these long and narrow speakers In many cases, the
center of the diaphragm, which is elongated in the horizontal or vertical direction, is point-driven
by a known magnetic circuit whose magnetic gap shape is a perfect circle, so split resonance in
the major axis direction As a result, the frequency characteristics of the reproduced sound
pressure in the middle and high frequency range become uneven, and the sound quality is not
good.
[0003]
In order to solve such a problem, for example, in JP-A-9-261795, voice coils respectively
arranged in a plurality of magnetic circuits provided with magnetic gaps are generated in each
magnetic circuit. A speaker has been proposed that is configured to vibrate by inductive force
and to be fixed to a long and thin diaphragm via a support portion so that the whole of the
diaphragm is vibrated uniformly and in the same phase in the major axis direction of the
diaphragm.
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1
[0004]
However, as is apparent from the drawings, the speaker proposed in the above-mentioned
publication includes a plurality of magnetic circuits arranged corresponding to the rectangular
diaphragm, and The structure of the speaker is extremely complicated because the plurality of
support portions respectively inserted into the magnetic gap of this magnetic circuit and coupled
to the inner periphery of the diaphragm are respectively connected with a plurality of voice coils
As a result, it is difficult to improve the production efficiency of the speaker.
[0005]
In particular, the spread of mobile phones that can use i-mode in recent years is remarkable, and
the mounting position of the speaker and receiver is often limited to an elongated space as the
liquid crystal screen becomes larger, and further downsizing can be achieved. Therefore, there is
a demand for a square speaker which is easy to assemble and stable in sound quality.
[0006]
In view of the present situation, the present invention has an extremely simple structure and is
easy to assemble, and can make the width of the short diameter portion and the long diameter
portion of the elongated diaphragm uniform. It is intended to provide a high performance square
speaker.
[0007]
SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to
claim 1 of the present invention is characterized in that the pole is placed on a rectangular yoke
having a laterally elongated pole at a central portion. A magnetic circuit in which a pair of
rectangular magnets are disposed to sandwich the frame-shaped plate on the magnet, and a
rectangular voice coil mounted in a magnetic gap formed between the pole and the plate A
rectangular diaphragm in which an upper end portion of the voice coil is fixed to a back surface,
and a flat surface holding the magnetic circuit, the voice coil, and the diaphragm is a rectangular
frame; .
[0008]
According to a second aspect of the present invention, in the rectangular speaker according to
the first aspect, the horizontally long yokes arrange a pair of rectangular yoke main bodies in
parallel at a predetermined interval, A central portion between the two yoke main bodies is
integrally connected by a connecting member in the form of a channel having a predetermined
height, and the connecting member is a pole.
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2
[0009]
Further, according to the third aspect of the present invention, in the rectangular speaker
according to the first aspect, the frame having a rectangular shape in the plane is formed of a
rectangular cylinder having a required height, and an inner peripheral portion The speaker
according to the present invention is characterized in that it has a projection for holding the
diaphragm and for positioning the plate.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION The embodiments of the present invention
will be described below with reference to the accompanying drawings. The square speaker of the
present invention has a long diameter even if the diaphragm is a horizontally long rectangular
shape. In order to improve the reproduction of the sound quality in the middle and high range by
making the width of the diaphragm of the part and the short diameter part uniform, the magnetic
circuit, the voice coil and the diaphragm that make up the speaker are all rectangular in plan
view. The best feature is the combination of these ingeniously.
[0011]
The diaphragm 1 forms a horizontal edge 2 along the outer peripheral edge of the horizontally
long diaphragm main body 1a as shown in FIG. 1, and has a rectangular shape for mounting a
voice coil 4 described later in the central portion. The diaphragm main body 1a other than the
mounting portion 3 has a gentle arc shape and is formed between the outside of the mounting
portion 3 and the outer peripheral edge. By making the widths of the long and short diameter
parts uniform, it is possible to improve the reproduction of the sound quality in the middle and
high frequencies.
[0012]
The voice coil 3 is formed by winding a coil around a rectangular cylindrical voice coil bobbin of
a required length having an opening of the same size as the mounting portion 3 and, together
with the diaphragm 1, a vibration system is formed. Although it comprises, only a voice coil may
be formed and used in square tube shape, and a voice coil bobbin is not essential.
[0013]
The magnetic circuit integrally connects a pair of elongated rectangular yoke main bodies 11 and
11 with a cross section channel-like pole 12 to form a yoke 10, and the elongated rectangular
main body 11 and 11 respectively. The magnets 9 and 9 are mounted and fixed, and the frame-
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3
shaped plate 7 having a rectangular through hole 8 of a required size formed in the center on the
top surface of the magnets 9 and 9 is mounted and fixed, A magnetic gap G is formed between
the outer peripheral portion 12 and the inner peripheral surface of the plate 7.
[0014]
In order to assemble the rectangular speaker S using the vibration system and the magnetic
circuit having such a configuration, first, the magnetic circuit is placed in the bottom of the
rectangular cylindrical frame 5 having a required height and in the form of a rectangular plane.
When inserted from above, the ridge 6 of a required width is formed inward on the inner
peripheral wall of the required height of the frame 5, so the upper surface of the plate 7
constituting the magnetic circuit is the lower surface of the ridge 6 , The magnetic circuit is
prevented from moving upward, and the magnetic circuit is fixed in the frame 5 so that the
terminal board 5a is fixed to the bottom of the frame 5 and the magnetic circuit is fixed in the
frame 5.
[0015]
Next, the voice coil 4 is adhered and fixed to the back surface of the mounting portion 3 of the
diaphragm 1 to form a vibration system, and then the lower end of the voice coil 4 is formed
between the pole 12 and the plate 7 The speaker 1 is set in the gap G, and the rear surface of the
edge 1a of the diaphragm 1 is fixed to the upper surface of the ridge portion 6 of the frame 5
using an adhesive to constitute a square speaker S.
[0016]
At that time, since the upper end of the voice coil 4 is fixed to the back surface of the flat
mounting portion 3 formed on the diaphragm 1, it is not necessary to use the damper basically,
but high power is required. In some cases, dampers are used.
In the figure, reference numeral 13 denotes a sound output plate having a large number of
through holes formed on the entire surface.
[0017]
Further, in the above embodiment, the yoke 10 is formed by integrally connecting the pair of
elongated rectangular yoke main bodies 11 and 11 with the cross-sectionally channel-shaped
pole 12, but the main point is As long as the pole 12 is formed in the central portion, the shape is
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4
not particularly limited.
[0018]
Furthermore, by making the magnetic circuit an external magnet type, the size of the magnet can
be changed, and even if the shape of the diaphragm becomes large, the size of the magnet can be
increased, and the sound pressure can be freely made. It is also possible to form a square ring
shape or a bar shape, and it is also possible to reduce the short diameter width by arranging a
short magnet only in the short diameter portion.
[0019]
【0019】
[0020]
According to the square speaker of the present invention, not only the diaphragm but also the
voice coil, and the vibration system and magnetic circuit constituting the speaker including the
magnetic circuit are all square, so that the diaphragm is elongated. Even in the case of the type,
the width of the short diameter part and the long diameter part can be made uniform, as a result,
the diaphragm strength is made uniform in the vertical and horizontal directions, the occurrence
and distortion of divided vibration are suppressed, and the sound quality reproduction of middle
and high frequencies is greatly improved. be able to.
[0021]
In particular, the prismatic speaker according to the present invention has a pole as compared to
a conventional yoke formed by a forging method that requires a pressing pressure to form a
cylindrical protrusion at the flat outer peripheral portion and center. Since the yoke can be
formed extremely easily, the manufacturing cost of the speaker can be reduced, and the yoke can
be formed by simple equipment.
[0022]
Further, by making the magnetic circuit of the square speaker into an external magnet type, the
degree of freedom of the magnet size is increased, the sound pressure can be made free, and the
shape of the magnet can be designed into a square ring or a bar. Furthermore, by installing a
short magnet only at the short diameter portion, the width of the short diameter can be reduced,
which brings about many practical advantages.
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[0023]
Brief description of the drawings
[0024]
1 is an exploded perspective view showing an example of a square speaker according to the
present invention.
[0025]
2 is a front sectional view of the square speaker in FIG.
[0026]
3 is a side sectional view of the square speaker in FIG.
[0027]
Explanation of sign
[0028]
DESCRIPTION OF SYMBOLS 1 diaphragm 2 edge 3 attachment part 4 voice coil 5 frame 6
protrusion 7 plate 9 magnet 10 yoke 11 yoke main body 12 pole S square speaker G magnetic
gap
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