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JPS57181191

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DESCRIPTION JPS57181191
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a voice coil pattern of a
general electroacoustic diaphragm, FIG. 2 is a side sectional view showing a conventional
electroacoustic diaphragm, and FIG. FIG. 4 is a side sectional view showing another embodiment
of the electro-acoustic diaphragm of the present invention, and FIG. 5 is each of the electroacoustic transducers shown in FIG. 2 to FIG. It is a temperature rise characteristic figure of the
voice coil in a diaphragm. 1 ...... insulating film, 2 ...... voice coil pattern, a metal foil formed on the
outer peripheral portion of the 2 '...... voice coil pattern, 3 ...... metal.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroacoustic
diaphragm such as a flat film diaphragm of a ribbon type speaker, for example, in which the
purpose is to dissipate heat generated from the voice coil of the speaker to the outside. Another
object of the present invention is to provide an electroacoustic diaphragm capable of suppressing
the temperature rise of the voice coil. An electroacoustic imaging plate of this type is, as shown
in FIG. 1, formed by depositing a voice coil pattern 2 of a metal foil on the surface of an
insulating film l. As shown in Fig. 2, as shown in Fig. 1, (1) ', 7jpy /, PI3 "41004. When using this
conventional electric sound # push plate as a speaker, it is necessary to flow a current tube
through this voice coil pattern 2, and as a result, the voice fill pattern 2 generates heat, and this
heat generation from the side Although it is completely lost through the metal foil 2 formed on
the outer portion of the voice coil pattern 2, heat is radiated directly to the air from the upper
and lower surfaces, so that the radiation efficiency of the heat is good ^ had a defect . This device
is intended to eliminate such drawbacks, and will be described below by the embodiments shown
in FIGS. 3 and 4. FIG. 3 is a side sectional view of the electric sound 4Pm moving plate according
to the present invention, in which a voice coil pattern 2 of metal foil is formed on the surface of
an insulating film 5 and a metal foil 2 'is formed on the outer portion of this voice coil pattern 2
Further, metal 3 is vapor-deposited on the back surface of the insulating film 1. FIG. 4 is a side
sectional view of another embodiment of the electroacoustic stimulable plate according to the
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present invention, wherein the insulating film 1 (2) 005 contest-10 surface, that is, the surface
on the side of the voice coil pattern 2 of metal foil. The metal 3 is deposited on the With such a
structure, the heat from the voice coil pattern 2 is conducted to the above-mentioned Ha-gold * 3
and the heat is radiated from the metal 3 to the air. As in the embodiment shown in FIG. 4, metal
3 taf on the voice coil pattern 2 of the metal foil may cause the voice coil pattern 2 to be shortcircuited by the metal 3. It is not a problem for the deposition of high resistance materials in the
range of several microns to several thousand angstroms ^. An example of measurement of the
temperature rise of the voice coil in an actual electroacoustic diaphragm is shown in FIG. In this
temperature rise characteristic diagram, (6) is the temperature rise characteristic of the
conventional electroacoustic diaphragm shown in FIG. 2, and a polyimide film of 12.5 microns
thickness as an insulating film, 20 (3) 纂 as a voice coil pattern. A 1006 micron thick flumi foil is
used.
Next, (鴎 is an electroacoustic imaging plate according to one embodiment of the present
invention shown in FIG. 3. The insulating film surface of the electroacoustic imaging plate having
the same specification as the above (4) has a thickness of 5000 angstroms of titanium. It is a
temperature rise characteristic at the time of making it vapor-deposit. Furthermore, as for the
electroacoustic diaphragm according to another embodiment of the present invention shown in
FIG. 4 (Q is an example of the voice coil drawing of the electroacoustic diaphragm having the
same specification as the above (1) The temperature rise characteristics of the case are shown. As
is clear from these temperature rise characteristics, it can be understood that the input resistance
of the voice coil is improved by performing titanium deposition. As described above, this
invention is an electroacoustic imaging plate having a voice coil pattern of metal foil deposited
on the surface of an insulating film, and the entire surface of the insulating film side or the voice
coil pattern side is covered. By providing the electric sound # diaphragm tube which has been
attached by attaching etc., the heat generated from the voice coil when this electric sound (4)
007 acoustic diaphragm is used as a speaker is adhered by the above deposition It is possible to
effectively escape the grazing land to the outside by the metal, which makes it possible to
suppress the temperature rise of the voice coil.
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