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JPS60194899

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DESCRIPTION JPS60194899
[0001]
TECHNICAL FIELD The present invention relates to a speaker suitable for use as a full-range,
uno) -like flat diaphragm for a thin speaker of large amplitude. Background Art and its problems
As shown in FIG. 1, a thin speaker using a flat diaphragm has been proposed. In FIG. 1, (1) shows,
for example, a rectangular flat diaphragm composed of a two-cam sandwich structure, and this
flat diaphragm (11 has a frame (3) K through an edge (2). It is supported. In FIG. 1, to join the flat
diaphragm (1) and the voice coil bobbin (4), the central portion of the flat diaphragm (1) has a
diameter substantially the same as the diameter of the voice coil bobbin (4). A hole (1a) is
formed, and one end of the voice coil bobbin (4) is faced to the through hole (la) K, and an outer
peripheral surface of one end of the voice coil bobbin (4) and an inner periphery of the through
hole (1a) Adhesively fix the surface with an adhesive. A voice coil (5) to which an audio current is
supplied is provided around the free end of the voice coil bobbin (4). In FIG. 1, (6) is a magnetic
circuit provided on the frame (3) corresponding to the periphery of the free end of the voice coil
bobbin (4), and this magnetic circuit (6) is a yoke having a center ball 6a), a magnet (6b), a plate
(6C), and a magnetic air gap formed between the center ball and the play (6C). (7) is a damper,
and this damper (7) is provided between the upper surface of the plate (6C) and a predetermined
position on the back surface of the flat diaphragm (1) in order to make the speaker thin. (8) Hold
the outer periphery of the edge (2) with the frame (3), and hold the edge (21 at the edge presser,
(9) is the through hole (1a) of the flat diaphragm (1) It is a dustproof cap provided on the flat
diaphragm (1) so as to be closed from the side. (1(1−ボイスコイル、。 The lead wire a [is
drawn upward along the voice coil bobbin (4) and the flat diaphragm (guided along the back
surface of the 11 (11 -(A terminal board fixed to the frame (3) through the joint of 71 (leaded to
a predetermined terminal of 111, soldered and fixed). A predetermined audio signal is supplied
from the outside to the terminal plate aD. In such a thin speaker as shown in FIG. 1, desired voice
can be obtained by supplying a desired voice current to the voice coil (5).
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However, the speaker as shown in FIG. 1 is further thinned and played) r6c) and the distance
between the flat diaphragm (1) relatively small and an excessive signal as a voice signal is a voice
coil (5) When it is supplied to the voice coil (5) of the voice coil (5), the flat diaphragm (from the
voice coil (5) to the flat diaphragm (11 reaches the floating part touches the corner of the plate
(6c). Since the line aα is extremely thin, there is a possibility that the lead line aα of this portion
may be cut. In particular, the amplitude of the flat diaphragm (11 It was remarkable in the
speakers of Lurange, Woofer etc. SUMMARY OF THE INVENTION In view of the foregoing, it is
an object of the present invention to propose a speaker free of distortions by cutting the lead
wire of a voice coil even when the speaker is made thin. SUMMARY OF THE INVENTION In the
present invention, a concave portion is formed in a predetermined portion of a flat diaphragm,
and a predetermined portion of a lead wire of a voice coil is fixed to the concave portion with a
resilient adhesive. Even when the speaker is made thin, the lead-out wire of the voice coil can be
prevented from touching the corner of the plate, so that there is no inconvenience such as
cutting the lead-out wire. An embodiment of the loudspeaker according to the invention will now
be described with reference to the drawings and to FIG. In FIGS. 2 and 3, parts corresponding to
FIG. 1 are given the same reference numerals, and the detailed description thereof is omitted. In
this embodiment, for example, a two-cam sandwich structure, a plane diaphragm consisting of a
body (a predetermined position adjacent to a through hole (1a) provided at the central portion of
11, for example, 180 ° apart as shown in FIG. 3) Two concave portions r12a) and r12b) are
formed at the positions from the back side. In this example, as shown in FIG. 2, the lead wire α1
from the voice coil (5) is along the voice coil bobbin (4), and the four parts (12a, 12b) are tied out
and the lead wire ( A passing portion of the recess (12a) (12b) of the lot is fixed to the recess
(12a) (12b) with a resilient adhesive such as a rubber adhesive (131). In this case, the four parts
(12a) (12b) K are to be filled with this elastic adhesive. After that, lead this lead a along the back
surface of the flat diaphragm (1) and pass through the junction of the flat diaphragm (1) and the
damper (7) as in FIG. 1 to the predetermined terminal of the terminal plate (111). Solder it.
Others are configured as in FIG. In this example, the lead wire (10 of the voice coil (5) is placed
along the voice coil bobbin (4) and the flat diaphragm (recess (12a) (12a) (12b Since the transit
part of) is fixed with a resilient adhesive, an excessive signal is supplied to this voice coil (5), and
even if the amplitude of the flat diaphragm (1) becomes abnormally large, this voice coil ( The
leader line aI of 5) does not touch the corner of the plate (6C), there is no inconvenience such as
cutting the leader line α1, and the leader part is protected by the elastic adhesive 0 .
Other operational effects are the same as those of the speaker as shown in FIG. In the above
embodiment, although an example using a honeycomb sandwich structure as the plane
diaphragm (1) has been described, the same function and effect can be obtained by using other
materials such as expanded polystyrene as the plane diaphragm (11. Of course it can be
obtained. Of course, the present invention is not limited to the above-described embodiment, and
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various other configurations can be taken without departing from the scope of the present
invention. Effect of the Invention According to the present invention, a recess (1!) Is formed in a
predetermined portion of the flat diaphragm (1). 1) While forming (12b) and fixing a
predetermined portion of the voice coil (5) to the recess (12a) (12b) with the elastic adhesive
.alpha. The voice coil (5) is supplied with an excessive signal, and the lead wire α1 of the voice
coil (5) plays even if the amplitude of the flat diaphragm (1) becomes abnormally large. There is
no need to touch the corner of 6C), there is no disadvantage such as cutting the leader line a1,
and this elastic adhesive (there is a benefit that the leader line (11 can be retained).
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an example of a thin speaker, FIG. 2 is a cross-sectional
view showing an embodiment of the speaker of the present invention, and FIG. 3 is a perspective
view showing an example of the main part of the present invention.
(1) is a plane diaphragm, (3) is a frame, (4) is a voice coil bobbin, (5) is a voice coil, (6) is a
magnetic circuit, (6C) is a plate, (7) is a damper, (101 is The leader lines (12a) and (12b) are four
parts, respectively, and 031 is a resilient adhesive. Figure 1 Figure 2
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