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JPS5741397

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DESCRIPTION JPS5741397
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a conventional loudspeaker,
FIG. 2a is a partial sectional view showing one embodiment of the loudspeaker according to the
present invention, and FIG. 2 is a ribbed cone of the present invention. FIG. 1 ...... coil bobbin, 10
...... flat diaphragm, 21 ...... ribbed cone.
DETAILED DESCRIPTION OF THE INVENTION The invention relates to a loudspeaker. There is a
book as shown in FIG. 1 for the speaker using the flat diaphragm at -4. That is, fl) is a cylindrical
coil bobbin, the voice coil (2) is wound around the lower periphery of the coil bobbin (1), and the
center ball (3) is loosely inserted from the lower opening. A plate (4) is formed on the center ball
(3), and a top plate (6) is broken on the plate (4) via a magnet (5). One side surface of the trough
frame H61 faces the voice coil (2), and one end of the frame (8) to which one end of the damper
(7) is fixed is increased on the upper surface of the (1) It is attached. The other end of the
damper (7) is fixed to the upper outer periphery of the coil bobbin (1) adjacent to one end of the
drive portion (9). The flat diaphragm OI is fixed to the other end of the drive portion (9) by a
loading amount, and the peripheral portion of the flat plate I is attached to the other end of the
frame (8) through an edge (I) It is done. And, a magnetic circuit is constituted by the center pole
(3), the plate (4), the magnet (5) and the top flat (6), and when an acoustic signal is supplied to
the voice coil (2), interaction with this magnetic circuit As a result, the driving force generated in
the voice coil is transmitted to the flat diaphragm 0 呻 via the coil bobbin (1) and the drive unit
(9), and electro-acoustic conversion is performed. However, in such a conventional speaker
structure, the strength of the drive unit is not sufficient, and there is a problem that the driving
force generated in the voice coil is not faithfully transmitted to the flat diaphragm. The present
invention has been made in view of such conventional problems, and aims at solving the abovementioned problems by providing a ribbed jacket (2) as a drive unit. Hereinafter, this invention
will be described based on the drawings. In FIG. 2 (a), fl) 12) H (II) fl is a coil bobbin of the first
section, a voice coil, an edge and a flat diaphragm, respectively. The I2 jin is a ribbed cone, and
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this ribbed cone (one end of the ribbed is fixed to the upper outer periphery of the coil bobbin (1)
and the other end is fixed to the flat diaphragm tll). As shown in the figure, the coil bobbin (1) llI
has a large diameter on the small flat diaphragm OI side, and a substantially conical drive portion
in which a rib @ is formed on the outer periphery thereof. As described above, by pressing the
ribbed cone as a drive unit for driving the flat diaphragm, the strength of the drive unit can be
increased, and the contact area with the flat diaphragm can be increased. .
Therefore, the driving force generated in the voice coil can be faithfully transmitted to the flat
diaphragm. In addition, as the contact area with the flat diaphragm is increased, the flat
diaphragm is also reinforced, and (3) the piston vibration area can be expanded, and the effect
that the reproduction band of the speaker becomes large can also be obtained. The production
cost of this ribbed cone is comparable to that of the conventional one.
11-05-2019
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