JPS5036969

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DESCRIPTION JPS5036969
Next, the operation of this embodiment will be described. Air supplied from an air pump (not
shown) is blown to the inner surface of the voice coil bobbin 8 through the air flow pipe 24, the
nipple 23, the chamber 21 and the air supply hole 22. The air blown out from the air supply hole
22 and hit the voice coil bobbin 8 is divided in the vertical direction, but the air coming out at the
top is from the portion surrounded by the voice coil bobbin 8 and the diaphragm 6, the dust cap
11, and the upper surface of the center pole 20 It is discharged to the back of the speaker
through the exhaust hole 25. The air coming out of the voice coil 9 is discharged to the back of
the speaker through the through hole 26 of the plate 1, but a part of the air passes through the
outside of the voice coil bobbin 8 and is drawn to the top of the plate 3. Since the thin air flow
layer is formed between the voice coil bobbin 8 and the center pole 20 as described above, the
voice coil bobbin 8 is held in the center of the magnetic gap without being in contact with the
center pole 20. As described above, since the voice coil bobbin 8 can be held in the magnetic cap
by blowing air uniformly to the inside of the voice coil bobbin 8, the speaker according to the
present embodiment does not require the conventional damper 10, and nonlinearity is not
achieved. The distortion can be reduced, and since the diaphragm 6 is supported only at the
upper outer periphery, a high compliance speaker can be manufactured. Further, since the air
gap between the voice coil bobbin and the center hose 20 can be reduced, the variation of the
magnetic flux in the magnetic circuit can be increased, and the efficiency of speech can be
improved. In addition, since air always flows around the poison coil 9 ', the allowable input of the
speaker can be increased because the voice 30 [111111]. As is apparent from the above
embodiments, according to the present invention, a chamber is formed inside the center pole,
and a plurality of air supply holes communicating with the chamber are provided in the radial
direction of the center pole to supply air to the chamber. Air is blown out from the air supply
hole, and this air is blown to the inside of the voice coil bobbin to hold the voice coil bobbin by
the magnetic gear tub itself, and according to the present speaker, the following effects can be
obtained. It can be done. (1) It is possible to reduce the non-linear distortion which can hold the
voice coil bobbin without using a tamper. (2) Since the support of the diaphragm may be edge 9
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only, a high compliance speaker can be manufactured. (3) Since the air gap between the voice
coil bobbin and the center pole can be reduced, the magnetic flux density of the magnetic circuit
can be increased, and the speaker p efficiency can be improved.
(4) Since air constantly flows around the voice coil, the rate of temperature rise of the voice coil
can be reduced, and the allowable input of the speaker can be increased.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
electrodynamic speaker, FIG. 2 is a cross-sectional view of the electrodynamic speaker according
to an embodiment of the present invention, and FIG. . ８・・・・・・ボイスコイルボビン、９・
・・・・・ボイスコイ・し１． Nitome-II? l'1 11 11 'l, 21 ··· · · · · · · · · 2 EndPage: ２
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