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JPS56168496

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DESCRIPTION JPS56168496
Description 1, title of the invention
スピーカ
3. Detailed Description of the Invention The present invention relates to a loudspeaker, and more
particularly to a loudspeaker provided with an empty space in front of an edge. A general
structural cross-sectional view of a conventional speaker is shown in FIG. In FIG. 1, the
diaphragm 10 # i has a conical shape, and has a dust cap 12 inside it and on the top? The chair
coil 14 is provided. The diaphragm 10 is attached to the frame 18 via an edge 16 at its
periphery. The frame 1gIC is provided with a plate 20, and a center pole 26 integral with the
yoke 24 is inserted into the center hole of the grate 20 with a gap 28 therebetween. A magnet 30
is held between the above-mentioned great 20 and the yoke 24, and a magnetic circuit is formed
by these 20.24, 30. One end of the discoil 14 is provided in the gap 28 so as to be movable in the
axial direction, and the chair coil 14 has a frame 1syCjlt & t via a dangling 32. A gasket 34 is
provided at the mounting portion of the error 16 of the frame 18. The conventional speaker will
be described next with its configuration as described above. When the signal current is supplied
to the chair coil 14, the diaphragm 10 vibrates in the low frequency region, and the fundamental
sound pressure characteristics (hereinafter referred to as flat surface sound pressure
characteristics are apparent from the sound pressure frequency characteristics shown in FIG. A
sound pressure characteristic (100) is obtained. In the high region, the divided vibration occurs,
and a large peak (/... I cut beak) occurs on the sound pressure characteristic, and the level
decreases with the mountain and valley above it. Assuming that the frequency at which the high
cut peak occurs is fh, the second harmonic distortion characteristic 102 and the third harmonic
distortion characteristic 104 have a peak at the above frequency fh and a half of the frequency fh
(fh / 2 ) And one-third (fh / 3) each have a peak. In this high cut peak, when the loss of the
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diaphragm 10 is small, the height of the peak is high, and the peak of the distortion characteristic
corresponding to it is also high. Furthermore, when the rigidity of the diaphragm 10 is small, that
is, the ratio of the Young's modulus E to the density r is relatively small /? Is smaller, the
frequency fh at which the high cut peak occurs is lower. In any of the above cases, it is not
preferable from the viewpoint of the performance of the speaker but a countermeasure is
required. Further, there is one shown in FIG. 3 as one of the structures of the edge portion in the
above-mentioned conventional speaker. This figure is an enlarged cross-sectional view of the
edge portion, in which the gasket 34 is extended in the direction covering the edge 16 and a
cavity 36 is provided in front of the edge 16. FIG. 4 shows the sound pressure characteristic 100
of the speaker having the edge portion structure of FIG. 3, which is the result of numerical
calculation assuming that divided vibration does not occur in the diaphragm 10 and the edge 16.
As is apparent from FIG. 4, a large valley is produced at the high frequency fe. This valley is due
to a kind of resonance of the cavity 36 and an acoustic effect. FIG. 5 is a sound pressure
frequency characteristic of the speaker having the edge portion structure of FIG. In FIG. 5, the
sound pressure characteristic 100 has a frequency f, a valley due to resonance of the cavity 36 at
the end and a peak due to the divided vibration of the diaphragm 1 ° at the frequency fh.
Further, similarly to the second harmonic distortion characteristic 102 and the third harmonic
distortion characteristic 104 shown in FIG. 2, there are also peaks due to the divided vibration,
and it can not be said that the characteristics 100.102.104 are both good. Therefore, when
configuring a multi-way speaker device with the above-mentioned speakers, it is possible to use
valleys or the like as shown in FIG. There is a limit in removing the influence of the peak, and
there is a disadvantage that the influence on the characteristics of the valley and the peak and
the sound quality is large. Heretofore, there have been mechanical methods and electrical
methods as methods of reducing the high cut peak at the frequency fhvc and the influence
thereof. Mechanical methods include changing the material of the diaphragm (increase loss or
increase H / P), changing the shape (corrugation, rib), applying a damping agent, mounting a
braking ring, etc. . As an electrical method, there is a method of connecting an antiresonant
circuit having a resonant frequency at a frequency fh in series with a speaker. However, all of the
above methods have the disadvantage that the assembly process is added and the cost is
increased. The present invention has been made in view of the above-described conventional
problems, and an object thereof is to provide a speaker having a low i-cut peak and flattened
sound pressure frequency characteristics. In order to achieve the above object, the present
invention, in a speaker provided with a cavity on the front of an edge, matches the resonance
frequency of the cavity with the frequency at which the high cut peak occurs due to the divided
vibration of the diaphragm. , The height of the high cut peak is reduced. Hereinafter, preferred
embodiments of the present invention will be described based on the drawings. As means for
forming the cavity 36 on the front surface of the edge, as shown in FIG. 3, the diaphragm 34 is
extended in the direction covering the edge 16 in addition to the structure extending the gasket
34 in the direction covering the edge 16. It is also good. In addition, the one other than the
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diaphragm 10 and the gasket 34 may be installed so as to cover the edge 16. The speaker may
have any of a cone shape, a dome shape, and a flat (flat) shape.
FIG. 6 shows the resonance frequency f of the cavity 36 before the edge. Shows the sound
pressure frequency characteristics of the speaker of the present invention in which the frequency
fh at which the high cut peak occurs due to the vibration of the diaphragm 100 divided vibration
is matched, and the valley at EndPage: 2 at the frequency fe and the peak at the frequency fh
cancel each other Thus, the high region of the sound pressure characteristic 100 is flattened.
Further, the second harmonic distortion characteristic 102 and the third harmonic distortion
characteristic 104 are also flattened in the high region with reduced peaks due to the divided
vibration. Since the present invention reduces the high cut peak by the acoustic method of
matching the resonance frequency of the cavity before the edge with the frequency at which the
high cut peak occurs due to the division vibration as described above, the above-mentioned
conventional mechanical method and The high cut peak can be easily and inexpensively reduced
as compared to the electrical method.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view showing half of a
conventional speaker, FIG. 2 is a sound pressure frequency characteristic diagram of the speaker,
FIG. 3 is an enlarged cross-sectional view of a part of the speaker, FIG. Is a sound pressure
frequency characteristic diagram when it is assumed that divided vibration does not occur in the
diaphragm and the edge, FIG. 5 is a sound pressure frequency characteristic diagram of a
conventional speaker having the structure of FIG. 3, and FIG. It is a sound pressure frequencycharacteristics figure of this invention speaker which has a structure of FIG. In the drawings, the
same members are denoted by the same reference numerals, 10 is a diaphragm, 12 is a dust cap,
14 is a voice coil, 18 is a frame, 20 is a grate, 24 is a yoke, 26 is a center ball, 28 is a gap, 30 Is a
magnet, 32 is a damper, 34 is a gasket, 36 is a cavity, 1-oo is a sound pressure characteristic, and
102. 104 is a second and third harmonic .phi. Characteristic. Agent Patent Attorney Shino
Kuwano-(Other-Name) Fig. 1 Fig. 2 Fig. 3 Fig. 4 EndPage: 3
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