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A magnetic gap is provided in a magnetic circuit having an electroacoustic transducer 1, a
magnet, a yoke, a magnetic plate and the like, and a conductor is attached to the magnetic gap on
the surface that becomes the sound output side. An electro-acoustic transducer characterized in
that a vibrating film of an insulating material is disposed, and a mesh for heat dissipation is
disposed substantially parallel to the vibrating film so as to face the above-mentioned sound
emitting side pressure.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of an electroacoustic transducer of a film surface drive system where a conductor is on a
vibrating film surface, and in particular to a ribbon type speaker, the main intention of which is
to For example, the purpose is to make the heat dissipation in the speaker of this feed effective,
thereby to improve the allowable longevity at the time of driving. With regard to an
electroacoustic transducer including a ribbon speaker and a microphone, a number of EndPage: 1
proposals have been made by the present applicant. Therefore, an example of a ribbon-type
speaker to which the present invention can be applied will be briefly described first with
reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing the drive unit structure, and FIG. 2
is a longitudinal sectional view of the main part of the same. In the figure, (A) is the whole of the
drive assembly having a substantially rectangular outline, and (1) and (2) are first and second
rectangular magnets (3) and (2) disposed symmetrically in the left-right direction as the same
direction. 4) A first and a second magnetic pole plate, which are also rectangular and are
common to both magnet ON pole faces, (5) is a yoke joined across the S pole face, (6) is integral
with this yoke A center pole having a predetermined height is shown, and as is apparent from the
drawing, a strong distance is maintained on both sides of the first and second magnets (1) and
121 Fi center pole (6), and the first on the N pole surface side The second magnetic pole plates 3
and 4 project inward from each magnet and are spaced apart in the longitudinal direction. That
is, the first one. A magnetic empty N (magnetic field) is formed between the second magnetic
pole plates 3) and 14) and the center poles 6 and 9, respectively. In the case of this embodiment,
the inner pole side of the projecting portion of the first magnetic pole plate 13) JP-A-55-99898
(2) and the second magnetic pole plate 14), that is, the portion corresponding to the corner
position of the left and right magnets Symmetrical inverted-shaped notches ()) are made, and
vibrators (8) (generally including a vibrating membrane, a conductor and a fixed plate described
below) are disposed in these notches. For this vibrator (8), as shown in FIG. 3, for example, a
rectangular fixing plate (9) K made of a resin plate is processed similarly to the rectangular hole
a value, and the negative surface is subjected to heat resistance treatment When a vibrating film
a made of a resin thin film such as Mylar film (trade name) or a polyimide film is stretched and
bonded together, a metal layer such as the surface of the vibrating film a, that is, the sound
emitting surface side busy aluminum thin layer is This is subjected to photo-etching to form a
conductor (13 (12 m, 12 b is its forward or reverse path)) which is an oblong spiral pattern.
(13a) and (13b) are terminals for connecting lead wires to both ends of the conductor. Such a
vibrating body (8) is disposed at the junction of the first and second pole plates (3), (4) and the
center ball (6), and the oblong vortex vortices of the vibration man are contained in each of the
above-mentioned magnetic fields. If both side paths (121) and (12b) of the conductor a are
positioned and the electric signal is applied to the conductor (13, the diaphragm is also driven
according to known principles and the electric signal becomes an acoustic signal It is converted.
By the way, the oms ribbon type illustrated, the large surface problem that the speaker Kw is
included is that the allowable input (rated and maximum) is relatively small, and this is due to the
temperature rise of the conductor deposited on the vibrating membrane surface In particular, the
variation of the impedance with respect to the momentary electric signal human power is small,
which causes a rapid temperature rise, and as a result, the allowable input in continuous driving
can not maintain a high value. The present invention has been made in view of the point on the
point of view, and its purpose is to propose a novel means capable of effectively dissipating heat
of a ribbon type speaker as described above, but other film surfaces It is a turtle suitable also for
the drive type electroacoustic transducer.
Hereinafter, the present invention will be described in detail with reference to FIGS. FIG. 4 is a
longitudinal cross-sectional view of the main part showing one embodiment, that is, the case
where the present invention is applied to a ribbon type speaker. For convenience of illustration,
the stains are made to correspond to those in FIG. 2, and the same reference numerals are given
to the nine members described above. First of all, the outline of the basic concept of the present
invention is, for example, for the ribbon type speaker as described above, the heat dissipation
mesh is disposed close to and parallel to the sound output 11 of the vibrating film, thereby
raising the temperature of the conductor at the time of driving To suppress. Therefore, in the
case of FIG. 4, along the longitudinal direction (refer to FIG. 1) K of the opposing edge from the
upper surfaces of the left and right magnetic plates (3) and: 4) A diaphragm mesh body I, which
is processed to be parallel, is t-like. That is, the flat-plate body α4 is a flat portion squeezed one
step lower with symmetrical mounting pieces (14m) and (14b) to be joined (fixed by adhesion or
the like) to the surfaces of the magnetic plates (3) and (4). (14C), both side rising connection
parts of this flat part (14c) are shaped to conform to the opposing edges of each magnetic plate
(3), (4), and uniform between the vibrating membrane a and the flat part (14C) The interval is set
to 1.5 .mu.s or less based on the experiments of the present inventors. It can be easily
understood that the heat radiation of the conductors EndPage: 2 (12a) and (12b) on the vibrating
film surface is performed by the flat portion (14c) K of the diaphragm mesh α4. In addition,
material # 'i of mesh body α 4 wire diameter 0.1 to 0, 4 m copper alloy fj! It shall be made of
(copper wire and brass wire). The mesh is appropriately selected, and the entire mesh is blackcoated or otherwise treated to remove metallic gloss to increase the heat absorption rate. 5 and 6
are longitudinal sectional views of the main part showing another embodiment, and the ground
portion with respect to FIG. 4 is described with reference to the drive unit structure A and the
example of FIG. Although the redundant explanation of the matter is omitted, the example shown
in FIG. 5 is a rectangular flat mesh body (I !!) on the sound output side of the diaphragm mesh
body I of the previous example. 9 is stretched in parallel, and the longitudinal edges of the flat
mesh body α 9 are bonded to the horizontal surfaces in the notches (7) of the magnetic plates
(3) and (4), but in this case both sides The notch (7) is set deep from the magnet surface. Further,
FIG. 6 shows five examples on the upper surface of the flat-plate JP-A 55-99898 (3) (IIC) facing
the heat release side of the diaphragm mesh body (14) shown in FIG. Shows an embodiment in
which a nonmagnetic metal rod a @ having a rectangular cross section is mounted, which in
essence uses the heat capacity of the rod to obtain a further cooling action, The cross-sectional
shape of the rod material ae may be a plane in which the lower surface is in close contact with
the mesh of the flat portion αυ, and the shape of the other surface is not limited.
Of course, such a bar may be mounted on the mesh of FIG. The above are the respective
embodiments of the present invention, and the heat dissipating function to be exhibited is also
roughly clarified. FIG. 7 shows the vibrating film and the heat dissipation mesh 7 when the
ribbon type speaker is applied with the present invention. Is a curve diagram showing the
relationship between the temperature rise of the conductor corresponding to the interval
between the vertical axis representing temperature and the horizontal axis representing time,
and the measured values when the audio input is set to 10 kHz and 40 W are shown. That is,
song I! ! If the heat dissipation mesh is not provided, the curves c, dij and the intervals described
above are each 1.2. 'The conductor temperature in the case of 0 + 1.5 m, o, s s is shown, and the
gap between the vibrating membrane and the mesh for heat dissipation should be 1.5 or less, as
is clear from this measurement data An effective heat dissipation is thus represented. Thus, as
shown and described in each of the embodiments of the present invention, the mesh for heat
dissipation is skillfully combined with this type of ribbon wet speaker to suppress the
temperature rise of the conductor deposited on the vibrating membrane surface. It is possible to
greatly improve the allowable input at the time of driving, which is naturally based on a technical
idea different from the conventional mechanical protection mesh <It is an invention and its action
and effect are summarized If this is done, the linearity of the electrical signal and sound energy
of the electroacoustic transducer is significantly improved. However, the subject matter of the
present invention is not necessarily limited to the ribbon type speaker as illustrated, and in
general, it is applied to an electroacoustic transducer regarded as a film surface driving method
as described at the outset, and 4 superior effects will eventually be obtained. It can be
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a drive structure
of a ribbon type speaker, FIG. 2 is a longitudinal sectional view showing the main part thereof,
FIG. 3 is a perspective view for explaining a vibrating body, FIG. 5 and 6 are longitudinal
sectional views of the main part showing each embodiment of the present invention, and FIG. 7 is
a curve diagram showing the relationship of the conductor temperature corresponding to the
distance between the vibrating film and the mesh for heat dissipation. . In the figure, a person is a
drive unit structure, (1) and (21 are magnets, (31 and (4) are magnetic plates, (51 Fi yoke, (q) is a
center hole, (7) Fi notch, a υ vibration film, a'ari conductor, (14) is a drawn mesh body, a5 is a
flat mesh body, and ae is a bar. EndPage: 3
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