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JPS5669199

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5669199
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing a step of
forming a resin layer, and FIG. 2 is a frame on which the resin layer is formed. It is a longitudinal
cross-sectional view of the equipped speaker. In the reference numerals used in the drawings, 1...
Frame. 7 .. resin layer 12 .. speaker.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker,
and more particularly to a loudspeaker adapted to damp the resonance of its frame. In general,
the frame of the speaker is made of steel, aluminum or an alloy thereof and is formed by casting
or press forming. Accordingly, the internal loss is small, resonance is easy, and the resonance
sharpness is high. When the frame resonates, unnecessary vibration is transmitted to the baffle
plate of the speaker box to deteriorate the sound quality of the speaker, and this vibration is
directly radiated to cause distortion in the reproduced sound. In order to prevent such frame
resonance, for example, Japanese Utility Model Publication No. The speaker which stuck the
material is disclosed. However, according to such a configuration, it is necessary to wrap the
visco-elastic material around the plate-like portion through the opening of the frame, and the
workability is poor. Further, if the adhesion between the tape-like viscoelastic material and the
frame is insufficient, the desired braking effect can not be obtained. Furthermore, the portion to
which the viscoelastic material is attached is limited, and a sufficient braking effect can not
always be obtained. This invention is made in view of such a problem, Comprising: It concerns on
the speaker which formed the resin layer which has viscoelasticity on the surface of a flame |
frame. Therefore, according to the present invention, it is possible to provide a preferable
speaker with excellent operability and sufficient braking effect. An embodiment of the present
invention will be described with reference to the drawings. First, a process for forming a resin
layer on a frame (1) of a speaker will be described. By molding, a speaker (2) t frame (1) is
prepared as known in the art. This frame (1) is formed in a conical shape, for example, as shown
in FIG. Furthermore, a plurality of openings (2) are formed to be arranged circumferentially as
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required. A mask ring f3 + 141 made of an appropriate material is fitted and attached to the
outer peripheral side edge and the inner peripheral side edge of the frame (1). These rings f3) (4)
are for preventing formation of a resin layer at a predetermined position of the frame (11). The
shape of the ring (31 + 4) can be arbitrarily changed, whereby the position of the resin layer to
be formed on the surface of the frame (1) can be arbitrarily changed. The rings (3) and (4) may
be disposable one by one or may be used repeatedly a predetermined number of times.
Next, the resin solution (6) is placed in the tank (5). The resin raw material should just have
viscoelasticity, for example, a vinyl chloride, a urethane resin, etc. are used. These resins are
made into solution so that the frame (1) can be dipped. That is, the frame (1) to which the mask
ring (31 (4) is brazed) is immersed in the resin layer 11 [+61 in the tank (5). (3) Next, the frame
(1) is taken out of the tank (5), and the resin adhering to the outer surface of the frame (1) is
allowed to react and solidify. The reaction solidification of the resin is carried out under the
reaction conditions according to the conventional resin as known in the prior art, and it is carried
out by storing the frame (1) in the cured Ise or leaving it indoors. As a result, as shown in FIG. 2,
a resin layer (7) is formed on the surface of the frame fl). Thereafter, when the mask ring (3) (41
is removed from the frame (1), the resin layer is not formed on the portion where these masks (3)
+ 4 were attached, and the surface of the frame (1) Remains exposed to the outside as it is. A
drive unit Zt * t consisting of a voice coil (8) and a magnetic circuit (9) in the frame (1) in which
the resin layer (7) is formed in this way When the driving unit a) (a moving plate a) which is
driven by I to capture an image is viewed, a speaker value 3 is obtained as shown in FIG.
Furthermore, this speaker a 邊 is brazed from the front side to the portion of the circular opening
a of the baffle plate aj of the speaker box, for example. That is, the flange-like (4) portion 4 of the
outer peripheral edge of the frame fl) and the baffle plate ridge are coupled by screws or other
coupling means, and the speaker 03 is held by the baffle plate α: 11. Moreover, at this time, if
the resin layer (7) is formed on the back side of the flange-like portion 9 as shown in FIG. 2, the
resin layer (7) of this portion is used as the speaker box cabinet and the speaker a. It will play the
role of a frame padkin to seal between. Therefore, the frame packing can be omitted, and not
only the number of parts can be reduced but also the assembly operation can be simplified.
Furthermore, by configuring the speaker az as described above, the visco-elastic resin @ (7)
constitutes the damping layer of the frame (1), and the frame (1) does not resonate and vibrate,
and the frame The resonance sharpness of (1) is greatly reduced. That is, since the resin layer (7)
has a large internal loss, it absorbs vibrational energy.
For this reason, the sound quality of the reproduction sound of the speaker 113 is not
deteriorated, and the distortion is also reduced. Moreover, since the resin layer (7) is formed by
immersing the frame (1) in the resin solution (6), the adhesion between the frame (1) and the
resin layer (7) is excellent and reliable (5) (1) While braking is enabled, the braking effect is less
likely to decrease with time. Moreover, in order to form the resin layer (7), it is only necessary to
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simply immerse the frame (11) in the resin solution (6) to cause reaction solidification, which
requires relatively little processing to form the resin. It has the advantage of In addition, since the
resin layer (7) can be formed at any position on the surface of the frame (1) by changing the
shape of the mask ring (31 (4), the braking effect can also be arbitrarily changed. . As described
above, according to the present invention, since the resin layer having viscoelasticity is formed
on the surface of the frame of the speaker, a desired braking effect can be obtained by this resin
layer, and the resonance sharpness of the frame is reduced. . As a result, distortion does not
occur in the reproduced sound, and the sound quality is improved.
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