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DESCRIPTION JPH11205897

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DESCRIPTION JPH11205897
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker used in various audio equipment.
[0002]
2. Description of the Related Art In recent years, as digital signal processing technology has
dramatically advanced and the quality of electrical signals supplied to speakers has greatly
improved, development of speakers capable of high-quality sound reproduction is strongly
desired in response to this. ing.
[0003]
A conventional speaker will be described with reference to FIGS. 6 and 7.
FIG. 6 is a cross-sectional view showing a cross section viewed from the long and short diameter
sides of the above-mentioned conventional speaker, and FIG. 7 is a plan view of a circular
magnetic circuit which is the main part. In the figure, 1 is a bottom plate provided with a center
pole, 2 is a ring-shaped main magnet fixed to the bottom plate 1, and 3 is a top plate fixed to the
upper surface of the magnet 2. A frame 4 is connected to a circular magnetic circuit formed by
the bottom plate 1, the ring-shaped main magnet 2 and the top plate 3.
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[0004]
Reference numeral 5 denotes a ring-shaped cancel magnet which is magnetized and fixed to the
lower surface of the bottom plate 1 in a direction opposite to that of the main magnet 2.
Reference numeral 6 denotes a shield cover which covers the entire circular magnetic circuit.
[0005]
7 is a voice coil held in the magnetic gap formed by the inner periphery of the top plate 3 and
the outer peripheral surface of the center pole of the bottom plate 1; 8 is an elliptical damper
fixed to the voice coil 7; Is an elliptical diaphragm fixed to the tip of the voice coil 7.
Reference numeral 10 denotes a dust cap attached to the central upper surface of the diaphragm
9.
[0006]
Reference symbol a denotes a major axis side apex angle indicating the angle of the attachment
portion of the diaphragm 9 and the voice coil 7. 11 is a circular magnetic gap of the magnetic
circuit. 12 is a major axis ratio of the circular magnetic circuit, 13 is a minor axis ratio of the
circular magnetic circuit, and the ratio of the major axis to the minor axis is 1: 1 in this speaker.
[0007]
The operation of the conventional speaker configured as described above will be described
below. First, when an electrical signal is applied to the voice coil 7 of the speaker, a driving force
is generated in the magnetic circuit.
[0008]
This driving force is transmitted to the voice coil 7, and vibrates the elliptical diaphragm 9 fixed
to the tip end thereof to emit a sound according to the vibration. Furthermore, in order to reduce
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the magnetic influence to the outside, the magnetism is shut off by the cancel magnet 5 and the
shield cover 6.
[0009]
Also, in order to increase the sound radiated due to the vibration, the size of the circular
magnetic circuit constituted by the main magnet 2 and the cancel magnet 5 is increased to obtain
the output sound pressure level. In addition, in order to extend the high range reproduction limit
of the sound pressure frequency characteristics, in particular, the major axis side a of the angle
formed by the attachment part of the diaphragm 9 and the voice coil 7 is made as small as
possible to improve the high range characteristic. I was trying.
[0010]
However, in the above-described conventional configuration, the main magnet 2 and the cancel
magnet 5 or the like are formed on the bottom of the frame 4 of the speaker in order to increase
the emitted sound, that is, to obtain the output sound pressure level. It is necessary to maintain
the output sound pressure level by enlarging the circular magnetic circuit, and in particular, since
the magnetic circuit is formed in a circular shape, the type in which the ratio of the major axis to
the minor axis is different or elliptical In the case of limited shape and size constraints such as
limited space and aperture size of the speaker, the structure is established at the expense of the
output sound pressure level.
[0011]
In addition, in order to maintain the output sound pressure level, the circular magnetic circuit
protrudes more greatly than the frame 4 of the speaker, which in turn imposes a great restriction
on the usage.
Furthermore, since the major axis side apex angle a of the angle formed by the affixing portion of
the diaphragm 9 and the voice coil 7 in particular becomes large, the high frequency
reproduction limit of the sound pressure frequency characteristic is lowered, which adversely
affects the high frequency characteristic. It was
[0012]
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The present invention solves the above-mentioned conventional problems, and it is sufficient to
maintain a high magnetic flux density even among oval types, track types such as types having
different major axis to minor axis ratios, limited space, and speaker aperture size. An object of the
present invention is to provide a speaker having an excellent sound performance that can
achieve an output sound pressure level and can cope with any conditions under a slim, compact
shape and an extended high-frequency characteristic. It is.
[0013]
[Means for Solving the Problems] In order to solve the above problems, the speaker according to
the present invention has a rectangular magnetic gap of a magnetic circuit formed by a main
magnet, a cancel magnet, etc. on the bottom of the frame of the speaker. The outer diameter of
the circuit is also rectangular, and the dimensions of the short diameter side and the long
diameter side of the magnetic circuit are different, and the frame, voice coil, damper, diaphragm
and dust cap neck part are rectangular. In the case of an elliptical type or a track type, the ratio
of the major axis to the minor axis is different, the space is limited, and the aperture size of the
speaker is maintained at a high magnetic flux density to obtain a sufficient output sound
pressure level. This makes it possible to provide a speaker that can be earned and has excellent
sound performance that achieves a slim, compact shape and high-range characteristics with an
extension.
[0014]
According to the first aspect of the present invention, the shape of the magnetic gap of the
magnetic circuit is rectangular, the outer diameter of the magnetic circuit is also rectangular, and
the short diameter side of the magnetic circuit Frames, voice coils, dampers, and diaphragms
coupled to this have different dimensions on the longer diameter side, and also have rectangular
configurations such as oval and track types with different major and minor diameter ratios or
limited spaces. And among the aperture sizes of speakers, a speaker with excellent acoustic
performance that can maintain a high magnetic flux density to gain a sufficient output sound
pressure level, and realize a slim, compact shape and high-range characteristics with expansion.
It is provided.
[0015]
According to the second aspect of the present invention, the magnetic gap of the magnetic circuit
is constituted with non-uniform dimensions which are different on the short diameter side and
the long diameter side, and the long diameter and the short diameter of an elliptical type or a
track type etc. In addition to reducing the disturbance of the amplitude mode often seen in types
having different ratio of ratio and the seesaw phenomenon of the voice coil etc., it also absorbs
the dimensional variation of the magnetic gap at the time of assembly.
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[0016]
An embodiment of a speaker according to the present invention will be described below with
reference to FIGS.
In the description, the same part number is given to the same part as the same technology as the
prior art, and the description is omitted.
[0017]
(First Embodiment) FIG. 1 is a cross sectional view showing a cross section viewed from the long
and short diameter sides of a speaker according to an embodiment of the present invention in
one view, and FIG. 2 is an exploded perspective view of the same speaker. FIG. 3 is a plan view of
the rectangular magnetic circuit.
The difference between the present invention and the prior art will be described with reference
to the figure. 14 is a rectangular bottom plate, 15 is a rectangular main magnet, 16 is a
rectangular top plate, and 17 is a rectangular 18 is a rectangular cancel magnet, 19 is a
rectangular shield cover, and 20 is a rectangular magnetic gap.
21 is a rectangular voice coil, 22 is a rectangular damper, 23 is a rectangular diaphragm, 24 is a
rectangular dust cap, and A is a rectangular diaphragm 23 and a rectangular In particular, the
major vertical angle of the angle formed by the affixing portion of the voice coil 21 is shown, and
as can be seen from the respective figures, each rectangular type has a different rectangular ratio
of the ratio of the major axis to the minor axis. .
[0018]
In the present embodiment, the shape of the magnetic gap 20 of the magnetic circuit is
rectangular, the outer diameter of the magnetic circuit is also rectangular, and the dimensions of
the short diameter and the long diameter of the magnetic circuit are different. The frame 17, the
voice coil 21, the damper 22, the diaphragm and the neck portion of the dust cap 24 all have a
rectangular structure and do not protrude from the frame 17, and in particular, the magnetic
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circuit is formed in a rectangular shape. The output sound pressure level may be sacrificed even
when the shape restrictions such as oval type, track type, etc. differ in the ratio of the major axis
to the minor axis, the limited space and the aperture size of the speaker, etc. The structure can be
realized freely, and the magnetic flux density is high even among oval types, track types, etc., in
which the ratio of the major axis to the minor axis is different, the limited space, and the aperture
size of the speaker. It is possible to gain a sufficient output sound pressure level, and to provide a
speaker with excellent sound performance that realizes a slim, compact shape and high-range
characteristics with an extension that can be handled under any conditions. It is.
[0019]
Although FIG. 4 shows sound pressure frequency characteristics and second harmonic distortion
characteristics of the conventional speaker and the present embodiment, the speaker of the
present embodiment has sound pressure frequency characteristics 29 of the conventional
speaker over the entire band. It shows that the sound pressure frequency characteristic 28 is
higher than that of the above.
Also, it shows low range reproduction with extension also in the low range of sound pressure
frequency characteristics, and realizes high range characteristics with significant extension also
in high range.
Furthermore, compared with the second harmonic distortion (conventional 31), it can be
confirmed that the present embodiment (30) realizes low distortion and high linearity can be
obtained.
[0020]
Second Embodiment Another embodiment of the speaker according to the present invention will
be described with reference to FIG.
[0021]
FIG. 5 is a plan view of a rectangular magnetic circuit according to another embodiment of the
present invention.
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The difference between the present invention and the prior art will be described with reference
to the figure. 25 is a rectangular non-uniform magnetic gap in which the dimensions of the
magnetic gaps on the long diameter side and the short diameter side are different. 27 is a short
diameter side gap of the rectangular non-uniform magnetic gap 25.
[0022]
In the present embodiment, in particular, the elliptical type or the track which can not be
prevented by the uniform magnetic gap by having a structure in which the dimension of the
major diameter side gap 26 is larger than the dimension of the minor diameter side gap 27. The
distortion of the amplitude mode or the voice coil by allowing the major diameter side gap 26 to
balance the minor diameter side gap 27 by allowing the major diameter side gap 26 to
deteriorate the linearity at the time of amplitude often seen in types where the ratio of major
diameter to minor diameter is different. As well as reducing the seesaw phenomenon such as, it is
possible to absorb the dimensional variation of the long and short diameter magnetic gaps at the
time of assembly by the ratio of the long diameter side and the short diameter side.
[0023]
In each of the above embodiments, the outer diameter of the magnetic circuit is rectangular but
the shape is not limited as long as it is non-circular such as track type, square type or rectangular
type, and any shape may be used similarly. The effect of
[0024]
As described above, according to the present invention, the shape of the magnetic gap of the
magnetic circuit is rectangular, the outer diameter of the magnetic circuit is also rectangular, and
the dimensions of the short diameter side and the long diameter side of the magnetic circuit are
different. The frame, voice coil, damper, and diaphragm that are connected to the structure also
have a rectangular structure so that the ratio of the major axis to the minor axis is different, such
as elliptical type or track type, or the limited space and speaker. Among the aperture sizes, it is
possible to maintain a high magnetic flux density to gain a sufficient output sound pressure level,
and to realize a high-range characteristic with a slim and compact shape and an expansion that
can be handled under any conditions. It is possible to realize a speaker having acoustic
performance.
[0025]
Brief description of the drawings
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[0026]
1 is a cross-sectional view of an embodiment of the speaker of the present invention
[0027]
Figure 2 same exploded perspective view
[0028]
3 is a plan view of the rectangular magnetic circuit which is the main part of FIG.
[0029]
Fig. 4 Characteristic diagram of same sound pressure frequency characteristic and second
harmonic distortion characteristic
[0030]
5 is a plan view of a rectangular magnetic circuit which is an essential part of another
embodiment of the speaker according to the present invention.
[0031]
Fig. 6 Cross-sectional view of a conventional speaker
[0032]
7 is a plan view of the magnetic circuit which is the main part of the same.
[0033]
Explanation of sign
[0034]
14 bottom plate 15 main magnet 16 top plate 17 frame 18 cancel magnet 19 shield cover 20
magnetic gap 21 voice coil 22 damper 23 diaphragm 24 dust cap 25 nonuniform magnetic gap
26 gap 27 gap A major diameter top angle
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