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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a main part showing a
conventional speaker, FIG. 2 is a cross-sectional view of a main part of the speaker according to
the invention, and FIG. 3 is a main cross-sectional view showing another embodiment. is there. 1
...... diaphragm 2 ...... bobbin, meter ..... damper, 4 ...... voice coil, 5 ...... voice coil lead wire, 6 · · · · · ·
· · · · Relay terminal, 7 · · · · conductive wire, 8, 11 · · · · · · · · · · · · · · · · · auxiliary relay terminal,
10.12 · · · · conductor.
The present invention relates to a loudspeaker, and more particularly to a mechanism for
preventing excessive entry of the loudspeaker. The speaker converts, for example, the output
signal output from the power amplifier into sound, and is the most important part in the audio
apparatus. FIG. 1 is a cross-sectional view showing a main part of a speaker generally used in the
prior art, and a cylindrical bobbin 2 is fixed to a central portion of a trumpet-shaped diaphragm
1. The outer periphery of the substantially central portion of the bobbin 2 in the longitudinal
direction 1-j057422 / ρ is held by the damper 3. Further, a voice coil 4 is wound around one
end of the bobbin 2 and both ends thereof are drawn out as a voice coil lead wire 5 to a relay
terminal 6 provided in a part of the diaphragm 1. It is fixed to the relay terminal 6 by the solder
8 together with the wire and the conductive wire 1 for flexible external drawing such as
beryllium kappa. However, in the above-mentioned conventional speaker, when a direct current
is applied due to excessive input or a failure of the amplifier, the lead-out portion of the voice coil
having a small heat radiation effect generates heat, and the diaphragm smokes and fires
accordingly. I have llI. In this case, although the solder 8 of the relay terminal 6 is melted along
with the heat generation of the voice coil lead wire 5, the connection relation between the voice
coil lead wire 5 and the conductive wire 7 is maintained. . Therefore, the purpose of this
invention is to ensure that the speaker is protected from excessive input while having a simple
configuration. In order to achieve such an object, the present invention solders a spring-loaded
conductor between a 2-no 058 voice coil lead wire and a flexible conductive line for supplying an
input signal. Thus, the conductor is soldered by melting with the excessive input or DC input, and
the conductor is soldered by the spring property to release the connection by releasing the
portion. Hereinafter, the speaker according to the present invention will be described in detail
using the drawings. FIG. 2 is a cross-sectional view of an essential part showing an embodiment
of a speaker according to the present invention. The same parts as in FIG. 1 are indicated by the
same symbols and the detailed explanation thereof is omitted. In the figure, reference numeral 9
denotes an auxiliary relay terminal provided in proximity to the relay terminal 6, and the voice
coil lead wire 5 is drawn out to the auxiliary relay terminal 9. 10 is a conductor having a wound
spring structure, one end of which is fixed to the relay terminal 6 by the solder 8, and the other
end in the state shown by the normal time point line is forcibly suppressed to the auxiliary relay
terminal 9 It is fixed by the solder 11 together with the voice coil lead wire 5.
3-. In the speaker configured as described above, when an excessive input or a direct current
input is supplied through the conductive wire 7, the voice coil lead-out wire 5 or the conductor
10 generates heat. As a result, since the solder 11 melts, the inhibition of the conductor 10 is
released, and along with this, the end portion is restored as shown by a dotted line due to the
elasticity, and the electric circuit is opened. When the electric circuit is opened, the current
supply to the voice coil 4 is cut off, and it is possible to prevent smoke and ignition from the
diaphragm 1 accompanying abnormal heat generation. In this case, since the conductor 10 is
restrained by the soldering, the opening action accompanied by the melting of the solder 11 is
ensured. Further, in such a configuration, the repair work may be performed only by soldering
the conductor 10 again to the auxiliary relay terminal 9, which is extremely simple. Further, by
appropriately selecting the solders 11 having different solution temperatures, it is possible to
easily obtain the effect of preventing the excessive input in accordance with the input value of
the speaker. The conductor 10 having a spring property is not limited to the wound spring
structure 4-no 060. For example, as shown in FIG. 3, the conductor 12 having a pull spring
structure may be used. It is needless to say that the connection relationship may be released
automatically as the melting of. As described above, a conductive conductor having elasticity in
the dark of the conductive wire for supplying the input signal and the voice coil lead wire is
connected and fixed by soldering, and heat generation accompanying supply of excessive input
or DC input is used Melts the solder and automatically releases the connection by using the
elasticity of the conductor, so that the speaker can be reliably protected from excessive input
while having a simple configuration, and thus from the diaphragm. It is possible to prevent
smoke and ignition. In addition, the repair after protection from excessive input is very easy
because it is only necessary to solder the conductor again.