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DESCRIPTION JPS5230122

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DESCRIPTION JPS5230122
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a corner gutter of the
present invention, FIG. 2 is a sectional view of the X-X enlarged dog of FIG. 1, FIG. 3 is a detailed
sectional view of the operation of the corner rain gutter of the present invention , FIG. 4 is an
enlarged view of a main part of FIG. 3, and FIG. 5 is an enlarged bottom view of the corner gutter
according to the present invention, wherein 1 - · · · · · · · · · · · · · · angular central hole, 2 ... Arcshaped elongated hole, A 6. Fig. 1 Fig. 3 Fig. Fig. 2 Fig.44 Ichiroko 47-30122 (2) Fig. 5 - 50 -
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is intended
to improve the high frequency characteristics of speakers, in which a part of the diaphragm or
the dustproof cap is partially thickened and the mechanical loss of the part is increased, It is
intended to achieve the purpose. In the conventional speaker shown in Fig. 1, sharp peaks and
valleys were generated in the high frequency region in terms of its frequency characteristics.
This is caused by the divisional vibrations of the loudspeaker's imaging plate and dustproof cap.
Conventionally, in order to remove this co-photographing peak, it is necessary to weaken the
pressing pressure at the time of forming the imaging plate, Cones and so on were used. However,
this method has the disadvantage that it is difficult to extend the characteristics of the high
frequency range. The present invention attempts to improve the above-mentioned disadvantage
by partially thickening a part of the image pickup plate or the dustproof cap. FIG. 2 shows an
embodiment in the case where a part of the dustproof cap σ is thickened. In FIG. 2, (1) is a
diaphragm, (2) is a voice coil bobbin fixed to the diaphragm, (8) , (5) is the center pole, (6)
Haframe, (7) is the spider which supports the whole of the Hois coil bobbin (2), (8) is the edge,
and (9) is the dust cap. Also, (+ oa) (+ Ob) is a thick part with the dustproof cap (9a, (10a) is
provided in the center part of the dustproof cap, (10b) is on the outer periphery near the placing
part with the diaphragm As shown in FIG. The original purpose of the dustproof cap is to prevent
iron powder or dust from entering into the air gap (2) of the magnetic circuit, but since the cap
also vibrates together with the diaphragm, it also functions as an acoustic radiation plate It is
23-09-2018
1
fulfilled. For this reason, the resonance of the cap itself exerts an adverse effect on the sound
pressure characteristics. The cap also plays the role of reinforcing the diaphragm. The dustproof
cap according to the present invention can lower the resonance frequency of its own and can
reduce Q of resonance. Furthermore, because it increases in thickness partially, it does not
become too soft and it also serves to reinforce the diaphragm. In addition, FIG. 5 shows an
embodiment in the case where a part of the diaphragm is partially thickened, in which (υ - (9)
indicates the same place as in FIG. 2). I is the portion which increased the thickness to give
mechanical internal loss to the outer periphery of υ. By partially thickening the diaphragm in
this manner, abnormal resonance of the imaging plate can be prevented. The reason why only
the outer peripheral portion was made thick is because the sound pressure characteristics can be
extended in the high-rise pitcher with the 11-fold high (3), keeping the hardness of the inner
peripheral part (top part) by seven according to this way.
As described above, according to the present invention, since the diaphragm or the dustproof cap
is partially thickened and the mechanical loss of the part is increased, the mountains and valleys
on the frequency-sound pressure characteristic are relaxed as compared with the conventional
speaker, and furthermore, It is possible to obtain a loudspeaker having characteristics extending
to a high range.
23-09-2018
2
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