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JPS60189398

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DESCRIPTION JPS60189398
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
diaphragm for a speaker, and more particularly to an improvement in the joint between the
diaphragm and a voice coil. [Prior Art] As a conventional speaker, for example, there is one
shown in FIG. This figure shows a part of the cross section. At the lower part of the speaker, a
pole piece α1 having a protrusion a in the center is disposed, and a magnet (14) is disposed
around the protrusion α at an appropriate distance. A plate αQ is disposed on the upper side,
and a frame α frame is fixed to this play (11G) by an appropriate means. The above-described
protrusion (1), the voice coil (1) is inserted into the wound voice coil bobbin (2). Above the voice
coil bobbin) is bonded to a diaphragm having a honeycomb structure by an adhesive (good). The
vibrating plate (c) is formed of the skin material of the front and back), (g), and the honeycomb
core 0'4 which is the core material. A dust cap is provided above the voice coil bobbin), and a
spider is provided between the voice coil bobbin and the frame 0. The operation of the speaker
configured as described above will be described. The magnetic field generated from the magnet
is also present in the gap (b), but the magnetic field present in the gap (b) and the voice coil are
energized The generated magnetic field interacts to vibrate the voice coil bobbin (a). This
vibration is transmitted to the diaphragm (c) through the adhesive (c), and the vibration of the
diaphragm (c) is transmitted to the air to become a sound. As mentioned above, in the
conventional speaker, is the diaphragm (C) adhesive? Since it is joined to the voice coil bobbin (i)
by →, it is transmitted to the vibration force diaphragm (g) of the voice coil bobbin), the specific
elastic modulus E / P of the adhesive (iii) (E is the elastic modulus , P represents the density) is
small compared to the voice coil bobbin (a) or the diaphragm (c), so that the adhesive (c) has the
disadvantage of causing a loss. Moreover, since the application amount of the adhesive (c) in
each speaker product may not always be constant, there is a variation in the weight of the
vibration system, which causes a problem that the characteristics vary. Furthermore, there is also
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a disadvantage that the heat generated near the voice coil 00 is difficult to escape due to the
presence of the adhesive (c). [Summary of the Invention] The present invention has been made in
view of the foregoing points, and vibrations generated by energization of the voice coil are
favorably transmitted to the diaphragm, and variations in the performance of each product are
reduced, and furthermore, the voice coil It is an object of the present invention to provide a
speaker diaphragm capable of enhancing the heat dissipation of heat generated in the vicinity.
That is, the present invention achieves the above object by a speaker diaphragm in which at least
a part of a skin material is integrally formed with a voice coil bobbin. DETAILED DESCRIPTION
OF THE PREFERRED EMBODIMENTS The speaker diaphragm according to the present invention
will be described in detail with reference to the embodiments shown in the attached drawings. In
FIG. 2, an embodiment of a speaker diaphragm according to the present invention is shown
partially broken. Further, FIG. 6 shows a disassembled state, and FIG. 4 shows a state of being
attached to a speaker. In these FIGS. 2 to 4, the diaphragm (100) is composed of the upper skin
material (102), the lower skin material (104), and the nonicum core (1 (M) as a core material)
There is. Both are formed in a conical shape or a forested shape, and the center of the concave
portion of the upper skin material (1 [10] is formed in a cylindrical shape at the lower side,
thereby constituting a voice coil bobbin (108). A voice coil (110) is wound around the outer
periphery of the voice coil bobbin (108). That is, the upper skin material (100) and the voice coil
bobbin (108) are integrally formed, and as the material, metal foil, resin or paper formed by
paper making is used. As shown by the arrow (FA) shown in FIG. 3, a non-Nickam core (106) is
adhered to the upper skin (102) having the above-mentioned configuration, for example, by an
adhesive. The lower skin (104) is glued like FB). In this case, the 3 μm coil coil (108) is formed
in the center of the recess of the honeycomb (106) and the lower skin material (104), and has
nine through holes (106A). The voice coil (110) is wound after passing through (104A) as shown
by an arrow (FC), and the state shown in FIG. 2 is obtained. A state in which the diaphragm
having the above configuration is attached to the speaker is shown in FIG. In this figure, the same
reference numerals are used for the same or corresponding parts as the constituent parts shown
in FIG. In this figure, a voice coil bobbin (108) Kid and a projection a of the pole piece a1 are
inserted, and a spider (G) is provided between the frame (country). Further, the upper skin
member (102) is provided with a dust cap (b) as in the center of the recess. Next, the overall
operation of the above embodiment will be described. If the voice coil (110) is energized, the
voice coil bobbin (108) vibrates.
Since this voice coil bobbin (108) is integrally formed on the upper skin material (102) of the
diaphragm (100), such vibration is extremely smoothly transmitted to the diaphragm (100), and
transient characteristics Improve. Next, the heat generated in the vicinity of the voice coil (110)
can be well transmitted in the direction of the diaphragm (100), and the diaphragm (100) is in
contact with the open air over a wide area, so heat can be dissipated. Effectively, the temperature
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rise near the voice coil (110) is reduced. Furthermore, since the voice coil bobbin (108) and the
upper surface skin member (102) are integrally formed with each other, the adhesion between
the voice coil bobbin (108) and the diaphragm (100) by the adhesive becomes unnecessary. The
disadvantage is that there is no variation in the weight of the vibration system due to the
variation in the application amount of the adhesive for each product, and a stable speaker
efficiency can be obtained. In the above embodiment, the upper skin (102 ') and the voice coil
bobbin (108) of the diaphragm (100) are integrally formed, but the present invention is not
limited to this. For example, the lower skin material (104) and the voice coil bobbin may be
integrally formed. Moreover, another core material may be used. [Effects] As described above,
according to the speaker diaphragm of the present invention, since at least a part of the skin
material is integrally formed with the voice coil bobbin, the vibration caused by the energization
of the voice coil is preferable. The heat is dissipated, and furthermore, the variation caused by the
use of the adhesive between the products is reduced.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view showing a part of a conventional speaker, FIG. 2 is a partially broken
front view showing one embodiment of a speaker diaphragm according to the present invention,
and FIG. 3 is a speaker shown in FIG. FIG. 4 is a cross-sectional view showing a state in which the
speaker diaphragm shown in FIG. 2 is attached to the speaker.
In the figure, (100) is a diaphragm, (102), (104) is a skin material, (106) is a honeycomb core,
(108) is a voice coil bobbin, and (110) is a voice coil. In the drawings, the same reference
numerals denote the same or corresponding parts. Attorney Attorney Attorney Kimura 3 -24 G's
\ / = 'j' phrase (Tin / 10 / / l Oe me)
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