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DESCRIPTION JP2004241967

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DESCRIPTION JP2004241967
The present invention relates to a speaker mounted on an audio device, and more particularly to
a thin speaker, and it is an object of the present invention to improve high frequency
characteristics without losing the thin characteristics. A speaker according to the present
invention fixes the inner periphery of a diaphragm 8 to the outer periphery of a coupling 11
bridging the yoke 2 of the magnetic circuit A at the inner and outer periphery, and further, the
outer periphery of the coupling 11 The sub-cone 17 is fixed to the lower side of the speaker 11,
and the high-frequency characteristic is improved by the sub-cone 17, and the sub-cone 17 is
fixed below the outer periphery of the coupling 11. It is a solution of restrictions. [Selected
figure] Figure 1
スピーカ
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
thin speaker having a low overall height. 2. Description of the Related Art The prior art will be
described with reference to the thin loudspeakers of FIGS. FIG. 3 (a) is a top view of a
conventional thin speaker, FIG. 3 (b) is a side sectional view, and FIG. 4 (a) is a top view of a
coupling as a main part, FIG. 4A is a cross-sectional view taken along the line A-O-B in FIG. 4A,
FIG. 5A is a top view of the yoke as the main part, and FIG. 5B is a cross-sectional view of FIG. It
is an A-O-B sectional view. According to the figure, 1 is a frame, 2 is a yoke, 2a is a slit of the
yoke 2, 3 is a magnet, 4 is a top plate, and the yoke 2 and the magnets 3 and 4 constitute a
magnetic circuit A. doing. A voice coil 5 comprises a bobbin 6 fitted in the magnetic gap Aa of the
magnetic circuit A and a coil portion in which a coil is wound around the bobbin 6. 7 is a damper,
8 is a diaphragm, 9 is an edge, 10 is dust A cap 11 is a coupling, 11a is a coupling reinforcing
piece, 11b is a coupling flange, 12 is a voice coil lead, 13 is a flexible wire, and 14 is a terminal
(see, for example, Patent Document 1). In the prior art, the coupling 11 connects the voice coil 5
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to the diaphragm 8 and the damper 7, and the reinforcing piece 11 a increases the rigidity of the
coupling 11 to reduce the vibration transmission loss. Here, since the reinforcing piece 11a is
disposed so as to be movable in the slit 2a and in the slit 2a and / or on the slit 2a, the stroke can
be set by the depth of the coupling 11, and The same bass reproduction is possible. Patent
Document 1: Japanese Patent Application Laid-Open No. 2002-78082 However, further
improvement of the high frequency characteristic of the above-mentioned speaker is desired, and
a sub-cone for high frequency is desired. When mounted, it is necessary to increase the overall
height, and the mounting place of the speaker is to be limited. SUMMARY OF THE INVENTION In
order to solve the above-mentioned problems, the speaker according to claim 1 of the present
invention is a sub-cone below the outer periphery of a coupling fixed to the outer periphery of a
voice coil bobbin. Since the sub cone is fixed to the outer periphery of the coupling, the high
frequency characteristics can be improved without substantially affecting the overall height of
the speaker.
In the speaker according to claim 2 of the present invention, an opening is provided in the
vicinity of the reinforcing piece on the top surface of the coupling of the speaker according to
claim 1, and the connection between the bobbin portion of the voice coil and the coupling The
sub-cone is fixed to the coupling without interposing the voice coil lead by further pulling out the
voice coil lead drawn upward from the portion through the opening to the diaphragm side from
the lower end side of the outer periphery of the coupling. The ring can be fixed all around, the
vibration transmission is stable, and the improvement of the high frequency characteristic is
stable. BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a speaker
according to the present invention will be described below with reference to FIGS. 1 and 2. FIG.
The same parts as in the prior art will be assigned the same reference numerals and explanations
thereof will be omitted. Embodiment 1 A loudspeaker according to an embodiment of the present
invention will be mainly described with reference to FIG. 1 (a) and FIG. 1 (b). FIG. 1 (a) is a top
view of a speaker according to an embodiment of the present invention, and FIG. 1 (b) is a crosssectional view taken along the line A-O-B of FIG. 1 (a). Only the differences from the prior art will
be described with reference to the figure. Reference numeral 17 denotes a sub cone, and the
inner periphery of the sub cone 17 is fixed near the lower end of the outer peripheral side
surface of the coupling 11. In addition, this fixing is generally performed by attachment coupling.
As described above, since the sub cone 17 is fixed to the lower side of the outer periphery of the
coupling 11, the sub cone is provided without raising the overall height of the speaker or without
significantly increasing the overall height to improve the high frequency characteristics. Can
contribute to Second Embodiment Another embodiment of the present invention will be
described mainly with reference to FIG. 2 (a), FIG. 2 (b), FIG. 2 (c) and FIG. 2 (d). Fig.2 (a) is a top
view of the speaker of other embodiment of this invention, FIG.2 (b) is an enlarged view of the
coupling top surface of the reinforcement piece vicinity which is the principal part, FIG. c) is a
cross-sectional view taken along the line A-O-B in FIG. 1 (a), and FIG. 2 (d) is a side cross-sectional
view for explaining the state of drawing of the voice coil lead. The difference between this
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embodiment and the first embodiment will be described with reference to FIG. 15. Reference
numeral 15 denotes a coupling in which the inner surface is adhesively bonded to the voice coil
5 and the outer surface is adhesively bonded to the inner periphery of the diaphragm 8;
Reinforcement pieces provided on the coupling 15 so as to be located in or above the slit 2a of 2;
15b is a flange provided on the outer periphery of the coupling 15; 15c is a reinforcement piece
on the top face of the coupling Reference numeral 16 denotes a voice coil lead serving as a
terminal of the wire wound around the voice coil 5.
The voice coil lead 16 is drawn upward from between the bobbin of the voice coil 5 and the
coupling 15, inserted into the opening 15 c of the top surface of the coupling 15 and drawn
downward along the reinforcing piece 15 a, It is drawn out from the flange opening 15d, and the
outer peripheral side surface of the coupling 15 is drawn vertically from between the diaphragm
8 (in fact, the diaphragm 8 is a voice coil in a state where the outer peripheral side surface of the
coupling 15 is drawn vertically. Generally, it is inserted and bonded to each other 5) and drawn
out along the surface of the diaphragm 8 and electrically and mechanically joined to the flexible
wire 13 by soldering or the like. Although the voice coil lead 16 is drawn out from the flange
opening 15d in the above embodiment, the damper 7 may be provided with an opening so that
the voice coil lead 16 can be drawn out. In the present embodiment configured as described
above, the voice coil lead 16 is connected to the flexible wire 13 without passing through the
sub-cone 17 unlike the first embodiment, so the sub-cone 17 and the coupling 15 are It is
adhesively fixed around the entire circumference, and fixation can be performed reliably,
vibration transmission to the sub-cone 17 is stable as compared with the first embodiment, and
improvement of high frequency characteristics can be performed more stably. As described
above, since the speaker of the present invention has the sub cone fixed to the lower side of the
outer periphery of the coupling, it is possible to improve the high frequency characteristics
without substantially affecting the overall height of the speaker. It is. BRIEF DESCRIPTION OF
THE DRAWINGS [FIG. 1] (a) Top view of a speaker according to an embodiment of the present
invention (b) A-O-B sectional view of FIG. 1 (a) (FIG. 2) (a) Top view of a speaker according to
another embodiment of the present invention (b) An enlarged view of a coupling top surface in
the vicinity of a reinforcing piece which is the main part (c) A-O-B cross-sectional view of FIG. d)
A side sectional view for explaining the state of drawing of the voice coil lead which is the main
part. (FIG. 3) (a) Top view of a conventional thin speaker (b) Same side sectional view (FIG. 4) (a)
Same essential (B) A-O-B cross-sectional view of FIG. 4 (a) (FIG. 5) (a) Top view of the yoke as the
same part (b) FIG. 5 (a) A-O-B cross-sectional view of [Description of code] 1 frame 2 yoke 3
magnet 4 top plate 5 voice coil 6 bobbin 11, 15 coupling 11a, 15a Reinforcement piece 11b, 15b
Flange 12 voice coil lead 13 flexible wire 15c opening 17 sub cone
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