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JPS5778194

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DESCRIPTION JPS5778194
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention,
FIG. 1 is a perspective view showing a ribbon type speaker, and FIG. 2 is a sectional view of the
speaker shown in FIG. G и и и и и и и и и и и и и и magnetic gap, 5 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
иииииииииииии
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ribbon type
speaker arranged in the magnetic air gap of a magnetic circuit. Such a ribbon-type speaker is
configured so that the signal itself flows to the diaphragm itself to cause the diaphragm to
vibrate by radiating an electric current, so that the input resistance is substantially defined by the
temperature rise of the diaphragm. I will. For this reason, conventionally, measures have been
taken to raise the heat-resistant temperature of the diaphragm. For example, in the case of a
diaphragm in which a thin film made of an electrically insulating nJ bending material is provided
in the form of a groove and a coil, the heat resistance temperature is raised by using a polyimide
resin as a base film. However, in the method of raising the heat resistance temperature of the
diaphragm as described above, there is a limit in increasing the input resistance. The present
invention has been made in view of the above-mentioned point, and an object of the present
invention is to provide a ribbon type speaker for further improving the input resistance.
Hereinafter, the operation of the present invention will be described with reference to the
drawings. In the figure, 1 & and 1'b are a pair of magnets, 2 is a yoke for magnetically
connecting a pair of magnets 11L and 1b, 31L and 3b are a pair of pole pieces attached
respectively to the magnets 1a and 1b. An intermediate MG of the magnetic circuit is formed
between the pole pieces 3m and 3b. In the magnetic gap G, a phon @@ moving plate 5 is
disposed which is supported by the pole pieces 3 & 3b via both side edges or edges 4a and 4b,
respectively. The diaphragm 5 may be a metal ribbon made of aluminum foil or the like, or a thin
film having a conductor in the form of a film formed by etching or printing. The reference
numeral 6 denotes a horn which can be formed by resin molding, aluminum die casting or the
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like, which is attached to the front surface of the magnetic circuit by bonding or the like to give
directivity to the sound emitted from the diaphragm 5. The horn 6 is opened along the
diaphragm 5 (a), and the opening 6 is provided with a rib 6 & which crosses at the central
portion of the diaphragm 5 at right angles to the longitudinal direction of the diaphragm 5. This
rib 6 & is made of a thermally conductive nonmagnetic material such as copper, aluminum,
stainless steel, etc., and by positioning the horn 6 on the magnetic circuit, positioning is made
near the front of the diaphragm 5 so as not to impair the vibration. It is provided in the horn 6 as
it is. The rib 6m can also be integrally formed with the horn 6 when the ho 76 is formed by
aluminum die casting. By providing the rib 6m to the horn 6 as described above, the horn 6 is
reinforced, and when the horn 6 is attached to the magnetic circuit, the rib 6 & crosses the
central portion of the diaphragm 5 and its m-plane By positioning in the very near vicinity, heat
dissipation from the central portion of the most critical diaphragm of temperature rise is
performed effectively.
Although only one rib 6a is provided in the embodiment described above, it is possible to provide
only a few ribs for reinforcing the horn and reinforcing the heat of the diaphragm 5 more
effectively. Further, the present invention is equally applied not only to the ribbon type speaker
having the linear fk channel plate 5 as shown, but also to a ribbon type speaker having any
annular diaphragm. In particular, in the case where the annular diaphragm is provided on the
edge film in the form of a coil on a conductor, the temperature rise occurs substantially
uniformly along the annular ring, so the number of cross digging that does not disturb the sound
path It is preferable to provide the ribs at equal intervals. As described above, according to the
present invention, since the rib made of the heat conductive nonmagnetic material located in the
vicinity of the front surface to the fi 7 of the ribbon diaphragm is provided in the horn, heat of
the diaphragm is dissipated through this rib As a result, the temperature rise of the diaphragm
can be suppressed, and a ribbon speaker with a large input resistance that allows a larger input
can be obtained. Also, by the temperature rise or decrease of the diaphragm, the change in the
resistance value due to the temperature coefficient of the conductor of the diaphragm is reduced,
and the improvement of the power linearity can be measured. As described above, many effects
such as improvement in the performance and reliability of the HzFi reproduction apparatus can
be obtained.
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