JP2004129080

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DESCRIPTION JP2004129080
In a speaker unit that vibrates a diaphragm 7 by energizing a voice coil 5 installed in a frame,
there is no possibility that a lead wire 51 drawn out from the voice coil 5 may be broken
prematurely, and a lead A speaker unit is provided that is easy to fix the line 51 to the diaphragm
7. In a speaker unit according to the present invention, a diaphragm 7 has a plurality of
peripherally extending portions 72 outside the voice coil 5 and extending in a spiral shape from
the voice coil 5 side toward the outer peripheral edge. A rib 73 is formed, and a lead wire 51
drawn from the voice coil 5 is added to one rib 73 and extends on a bending line. [Selected
figure] Figure 1
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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker unit provided in a small electronic device such as a notebook computer and a portable
telephone. Conventionally, as shown in FIG. 7, for example, as shown in FIG. 7, a cover (11) is
installed at the front opening of a cylindrical frame (1) to form a flat resin case. In the case, a
disc-shaped resin-made diaphragm (6) is installed, and the outer peripheral edge of the
diaphragm (6) is connected to the inner peripheral surface of the frame (1). There is. A voice coil
(5) is fixed to the back surface of the diaphragm (6). Further, a dish-like yoke (2) is installed at
the center of the frame (1), and a magnet (3) and a pole piece (4) are installed at the bottom of
the yoke (2). A magnetic gap is formed between the inner peripheral surface of 2) and the outer
peripheral surface of the pole piece (4), and the voice coil (5) is disposed in the magnetic gap.
The lead wire (51) extending from the voice coil (5) extends along the back surface of the
diaphragm (6), the tip of which protrudes from the diaphragm (6), and the terminal (12) provided
on the frame (1) Soldered (13). The diaphragm (6) has a dome-shaped central portion (61)
located inside the voice coil (5), and an outer peripheral portion (62) with an arc-shaped cross
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section located outside the voice coil (5) As shown in FIG. 5, a plurality of ribs (63) linearly
extending from the voice coil (5) side toward the outer peripheral edge are integrally formed on
the outer peripheral portion (62). The vibration plate (6) has a plurality of ribs (63), which
increases the freedom of deformation, and can vibrate with a large amplitude with the outer
peripheral edge as a fixed end. The lead wire (51) drawn from the voice coil (5) is attached to the
rib (63) of the diaphragm (6) and extends on a straight line, and in this straight section, the
adhesive is used to form the diaphragm (6) It is fixed. However, in the conventional speaker unit,
the lead wire (51) is a rib (63) of the diaphragm (6). As the diaphragm (6) is stretched along a
straight line, it is subjected to repeated stress in the tensile direction and in the bending direction
with the vibration of the diaphragm (6) to cause metal fatigue, resulting in premature failure.
Therefore, as shown in FIG. 6, it is conceivable to extend the lead wire (51) drawn from the voice
coil (5) along a bending line crossing a plurality of ribs (63) of the diaphragm (6).
However, in this case, since the lead wire (51) can not receive the guide by the rib (63), it
becomes difficult to extend along a predetermined bending line, and not only the workability is
deteriorated but also the quality is stabilized. Can not An object of the present invention is to
provide a speaker unit in which a lead wire drawn from a voice coil does not lead to breakage
prematurely and it is easy to fix the lead wire to a diaphragm. In the speaker unit according to
the present invention, in the frame (1), a diaphragm (7) capable of vibrating with the outer
peripheral edge as a fixed end, and the diaphragm (7) And a magnet (3) for applying a magnetic
field to the voice coil (5). The diaphragm (7) has a plurality of ribs (73) which are bent in a spiral
shape toward the outer peripheral edge from the voice coil (5) side to the outer peripheral
portion (72) outside the voice coil (5) Are formed, and the lead wire (51) drawn from the voice
coil (5) is attached to one rib (73) and extends on the bending line, and its tip projects from the
diaphragm (7) It is connected to the terminal (12) provided in (1). In a specific configuration, the
plurality of ribs (73) are provided on the back surface of the diaphragm (7) on which the voice
coil (5) is installed, or are provided on the back surface. In the speaker unit according to the
present invention, the lead wire (51) drawn from the voice coil (5) extends along the bending line
along the rib (73) of the diaphragm (7), so vibration is caused. It is free to deform with the
vibration of the plate (7) and large stress does not repeatedly act on the same part. Therefore,
there is no possibility that the lead wire (51) will break early due to metal fatigue. In addition,
since the lead wire (51) drawn from the voice coil (5) can be extended along the bending line by
being attached to the rib (73) of the diaphragm (7), the work is easy It becomes. According to the
speaker unit according to the present invention, there is no possibility that the lead wire drawn
from the voice coil will break early, and the work of fixing the lead wire to the diaphragm is easy.
is there. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment in which
the present invention is embodied in a speaker unit shown in FIG. 7 will be specifically described
with reference to the drawings. In the speaker unit according to the present invention, as shown
in FIG. 7, a cover (11) is installed at the front opening of the cylindrical frame (1) to form a flat
resin case. In the central part, a dish-like yoke (2) is installed, and a magnet (3) and a pole piece
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(4) are installed on the bottom of the yoke (2). A magnetic gap is formed between the pole piece
(4) and the outer peripheral surface of the pole piece (4), and the voice coil (5) is disposed in the
magnetic gap.
Inside the frame (1), as shown in FIG. 1 and FIG. 2, a disc-like resin-made diaphragm (7) is
installed, and the outer peripheral edge of the diaphragm (7) is the frame (1). The voice coil (5) is
fixed to the back surface of the diaphragm (7). The diaphragm (7) includes a dome-shaped
central portion (71) located inside the voice coil (5) and an outer peripheral portion (72) with an
arc-shaped cross section located outside the voice coil (5). On the outer peripheral portion (72),
as shown in FIG. 1, a plurality of ribs (73) extending in a spiral from the voice coil (5) side toward
the outer peripheral edge are integrally molded. The rib (73) of the diaphragm (7) is projected in
an arc shape in cross section on the back side where the voice coil (5) is installed as shown in
FIG. 3, or as shown in FIG. On the back side where 5) is installed, it is recessedly provided in the
cross-sectional arc shape. By forming the plurality of ribs (73), the diaphragm (7) has a large
degree of freedom of deformation, and can vibrate with a large amplitude with the outer
peripheral edge as a fixed end. The lead wire (51) drawn from the voice coil (5) is attached to the
rib (73) of the diaphragm (7) as shown in FIG. Are fixed to the diaphragm (7). The tip of the lead
wire (51) protrudes from the diaphragm (7) and is soldered (13) to the terminal (12) provided on
the frame (1). According to the speaker unit of the present invention, since the lead wire (51)
drawn from the voice coil (5) extends along the bending line along the rib (73) of the diaphragm
(7), It deforms freely with the vibration of the diaphragm (7), and a large stress does not
repeatedly act on the same part. Therefore, there is no possibility that the lead wire (51) will
break early due to metal fatigue. In addition, since the lead wire (51) drawn from the voice coil
(5) can be extended along the bending line by being attached to the rib (73) of the diaphragm (7),
the work is easy It is possible to stabilize the quality by this. BRIEF DESCRIPTION OF THE
DRAWINGS FIG. 1 is a back view of a diaphragm and a voice coil provided in a speaker unit
according to the present invention. FIG. 2 is a cross-sectional view of the above diaphragm and
voice coil. 3 is an enlarged view of a portion A of FIG. 2 when a rib is provided on the back
surface of the diaphragm. 4 is an enlarged view of a portion A of FIG. 2 in the case where a rib is
recessed on the back surface of the diaphragm.
FIG. 5 is a back view of a conventional diaphragm. FIG. 6 is a back view of another conventional
diaphragm. FIG. 7 is a cross-sectional view of the speaker unit. Explanation of symbols (1) Frame
(12) Terminal (2) Yoke (3) Magnet (4) Pole piece (5) Voice coil (51) Lead wire (7) Diaphragm
(71) Central part (72) Outer circumference Part (73) Rib
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