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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a conventional dome type
speaker excessive input warning device, and FIG. 2 is a side sectional view showing an
embodiment of the dome type speaker according to the present invention. 1a ... voice coil bobbin,
1b ... diaphragm, 2 ... voice coil, 3 ... temperature sensitive material. In the drawings, the same
reference numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dome-shaped
speaker which visually warns of excessive input. In general, a speaker coil is a paper coil is
wound in a bottle, and a driving force is transmitted through the bottle and applied to the
diaphragm to become a sound wave, but the heat generated from the chair coil is directly
transmitted through the bottle Some things are transmitted to the magnetic circuit as radiant
heat. In recent years, a dome-shaped speaker having a good heat dissipation effect, in which a
discoil bobbin and a diaphragm are integrally formed of a metal material, has been considered. Is
this dome-shaped speaker, by its structure? It is confirmed by experiments that the temperature
rise of each part from the chair coil to the top of the diaphragm is almost uniform, and there is
almost no time delay in the temperature rise, which is instantaneous (about 1/10 second) The
same temperature distribution is also obtained. FIG. 1 is a circuit diagram showing a device
which visually warns the outside when excessive human power is applied to such a dome type
speaker, and as shown in this figure, a dome speaker (DSF) is conventionally used. A series circuit
of a light emitting diode (1, ED) and a resistor R is connected in series to the input terminal of the
light emitting diode (LED) [more excessive voltage is detected, light is emitted, and a warning is
issued. However, such direct connection of a non-linear element such as a light emitting diode
(LED) to the speaker circuit Vζ has a major drawback in that harmonic distortion is generated
by the connection. The present invention has been made to eliminate the above-mentioned
drawbacks, and provides a dome-shaped speaker capable of visually warning an excessive input
with an extremely simple configuration without connecting any external circuit causing
distortion. To be all purpose. An embodiment of the present invention will be described below
with reference to FIG. FIG. 2 is a side sectional view showing an embodiment of the dome-shaped
speaker according to the present invention, in which 1 is a structure in which a winding coil
bobbin 1a and a diaphragm 1b are integrally formed using metal foil, 2 is a structure Body l
mace coil? Was rolled on bin la! The seat coil 3 is attached to the top of the diaphragm 1b of the
structural body 1 by sticking or painting on the diaphragm 1b here, and a temperature-sensitive
material 1 having a color changeable at a predetermined temperature changes. Moti! Or Thermo
(a thermosensitive dye called India,-zo or thermosensitive paint. The plates, magnets and I-pieces
7 which constitute the 4, 5, and 6 # i magnetic circuits are the voices of the structure / body 1 on
which the coil 2 is wound in the space 8 of the magnetic circuit. The coil positions the bin 1a at
the edge, 9 is a frame.
In such a dome-shaped speaker, heat is generated from the chair coil 2 when an input is applied.
This heat is transmitted to the grate 4 or the single piece 6 by radiation, and directly from this
the & coil is transmitted to the bin 1a and is also transmitted instantaneously to the diaphragm
1b. At this time, when the above input becomes excessive, the heat generated from the coil 2
increases and the temperature of the diaphragm 1b rises. Accordingly, the temperature of the
temperature sensitive material 3 on the diaphragm lb also rises. When the temperature reaches a
predetermined temperature, the color of the temperature-sensitive material 3 changes, and this
color change causes an indication that an excessive input is applied and causes a warning.
Thereafter, when the temperature drops below a predetermined temperature, the temperature
sensitive material 3 returns to the original color due to the reversibility of the color change. In
the above example? Although the temperature sensitive material 3 is attached to the top of the
diaphragm 1b, as described above, since the temperature (rise) distribution of the diaphragm 1b
is uniform in each part, it is a position visible from the outside of the speaker If it is, it may be
attached to any part of the diaphragm 1b. As described above, according to this invention, since
the temperature sensitive material 3 that changes color with reversibility at a predetermined
temperature is attached on the diaphragm 1b, it is possible to visually warn of an excessive input.
Moreover, since no external circuit metal such as a light emitting diode (LED) (see FIG. 1) is
connected, harmonic distortion does not occur, and the structure is extremely simple.
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jps5723697, description
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