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JP2000102092

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2000102092
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic speaker unit, and more particularly to an electrodynamic speaker unit capable of
protecting a cone diaphragm used in the unit from heat generation of a voice coil.
[0002]
2. Description of the Related Art Conventionally, as a speaker unit, an electrodynamic type, an
electrostatic type, a piezoelectric type, an electromagnetic type and the like are known. Among
them, electrodynamic speakers (dynamic speakers) are classified into moving coil type, ribbon
type, brat Hara type, and hiil type according to the structure of the diaphragm and its vibration
source etc. The diaphragm is driven by the force, and it is the mainstream of the speaker because
high conversion efficiency can be obtained with a relatively simple structure. Above all, the
moving coil type accounts for the majority of the electrodynamic speaker, including a cone
speaker and a dome speaker.
[0003]
Among these, the cone-shaped speaker uses a conical diaphragm (cone diaphragm), and a voice
coil, a magnetic circuit, and a voice coil for generating an electromagnetic force for driving the
cone diaphragm are included in the magnetic circuit. It comprises a damper for keeping a fixed
position with respect to the gap, an edge for supporting the periphery of the cone diaphragm
connected to the tip of the voice coil, and a frame for connecting these parts.
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[0004]
Then, according to the speaker unit of that type, the voice coil reciprocates in the direction
perpendicular to the magnetic lines of force to drive the directly connected cone diaphragm by
flowing the audio current to the voice coil placed in the gap of the magnetic circuit. be able to.
[0005]
Here, the voice coil is integrated by winding a copper wire or the like on a cylindrical bobbin
made of, for example, paper, aluminum, a polymer material, or a composite material thereof, and
a cone vibration coupled thereto The board is mainly made of wood pulp, and is made of paper
containing various fibers such as carbon fiber, metal such as aluminum or ceramics, or plastic
such as polypropylene.
[0006]
In particular, the cone diaphragm is made of paper to form concentric ridges called corrugations,
made of plastic and mixed with carbon, or as described above, in order to prevent divided
vibrations that move the whole unevenly. It is made of metal to increase rigidity, but among
them, plastic cone diaphragm can obtain relatively high rigidity by mixing carbon as mentioned
above, etc. Moreover, it can be easily processed by molding. The spread is remarkable because it
is excellent.
[0007]
However, in the electrical input applied to the speaker, most of the rest converted to acoustic
energy is converted to heat by the voice coil, so an excessive electrical input is applied. In
addition to burning out the voice coil, the cone diaphragm made of plastic is mainly made of
thermoplastic resin such as polypropylene or polyester, so the heat generation of the voice coil
causes the junction with the voice coil even with relatively small electric input It has the
disadvantage of softening and adversely affecting the sound quality.
In particular, when the electric input is high or when the use time is long, there is a possibility
that the cone diaphragm itself may be broken or the lead-out portion of the voice coil may be
broken due to the progress of the softening.
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[0008]
In order to suppress the softening, it is conceivable to use a highly heat insulating material such
as paper or glass fiber as a bobbin of a voice coil, but a metal such as aluminum is used for a
plastic cone diaphragm for sound quality and strength reasons. Bobbins are often used, and when
the calorific value of the voice coil is high, it is impossible to completely prevent breakage of the
cone diaphragm due to heat transmitted through the metal bobbin.
[0009]
The present invention has been made in view of such circumstances, and an object of the present
invention is to use a plastic cone diaphragm to eliminate the possibility of damage due to heat
generation of a voice coil.
[0010]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
provides a plastic cone diaphragm 1 having a circular hole 15 to which a voice coil 4 is
connected at its central portion and a vibration including the voice coil 4. In the electrodynamic
speaker unit driven by the source 2, at least one of the inner and outer surfaces 1A and 1B of the
cone diaphragm 1 around the circular hole 15 from the circular hole side to the entire height of
the cone diaphragm 1 It is an object of the present invention to provide an electrodynamic
speaker unit characterized by being reinforced by a heat insulating material 16 to a position not
exceeding 50% of the maximum of h.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, application examples of the
present invention will be described in detail based on the drawings.
First, FIG. 1 shows an example of an electric speaker unit according to the present invention.
In the figure, the entire structure of the unit will be briefly described.
In the figure, 1 is a conical plastic cone diaphragm formed by injection molding or blow molding,
2 is a vibration source for driving the cone diaphragm 1, and the vibration source 2 is a cone
diaphragm 1. And a voice coil 4 for generating an electric magnetic force to drive the
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[0012]
The magnetic circuit 3 is formed by, for example, coupling a pair of plates 5 and 6 made of
magnetic material via a ring-shaped magnet 7 and arranging a pole piece 8 at the center thereof.
The magnetic flux of the magnet 7 can be concentrated in the gap 9 by the pair of plates 5 and 6
and the pole piece 8, and a magnetic field can be generated in a direction perpendicular to the
voice coil 4 placed in the gap.
[0013]
On the other hand, the voice coil 4 is formed by, for example, winding a copper wire or the like
coated with an insulating film around the bobbin 10 made of aluminum, and according to this
voice coil 4, the gap 9 in the magnetic circuit 3 is described above. The cone diaphragm 1 is
connected to its tip.
[0014]
In FIG. 1, 11 is a frame, 12 is a damper for keeping the voice coil 4 at a fixed position with
respect to the gap 9 of the magnetic circuit 3, and 13 is a tip of a weir for preventing lateral
deflection of the cone diaphragm 1. An edge 14 formed on the opening edge is a gasket for fixing
the edge 13 to the frame 11.
[0015]
Next, FIG. 2 is a plan view of the cone diaphragm, and FIG. 3 shows a cross section taken along
line XX in FIG.
Here, the cone diaphragm 1 is made of a plastic whose main raw material is a thermoplastic resin
such as polypropylene, and the form thereof is a conical shape in which a circular hole 15 for
connecting the voice coil 4 is formed in the center, It has a paracurved shape (curved cone) as
shown in FIG.
Although the edge 13 is connected as a separate free edge to the tip opening edge of the cone
diaphragm 1, it may be an integrated fixed edge.
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Then, according to this cone diaphragm 1, the inside of the edge 13 is an outside diameter D, and
the outside diameter D is, for example, about 100 mm, and the inside diameter d, that is, the
diameter of the circular hole 15 is about 25 mm.
[0016]
In particular, the heat insulating material 16 is provided on the side of the cone diaphragm 1 to
be connected to the voice coil 4, that is, on the side of the circular hole 15.
FIG. 3 shows an example in which the cone diaphragm 1 is lined with a heat insulating material
16, and FIG. 4 shows a state in which the portion is enlarged.
[0017]
The heat insulating material 16 is a material having a small thermal conductivity such as paper,
glass fiber, carbon fiber, or a material whose thermal deformation temperature is higher than
that of the main raw material of the cone diaphragm 1, or a material having little thermal
deformation. The paper and heat-resistant fiber are solidified with a thermosetting resin and
made conical as shown in FIG.
[0018]
Then, the heat insulating material 16 is fitted to the outer surface 1A of the cone diaphragm, and
the both are joined together with an adhesive or the like to be integrated, thereby reinforcing the
circular hole 15 with the heat insulating material 16.
In addition, as a bonding method of the heat insulating material 16 and the cone diaphragm 1,
the adhesive material is not used but the heat insulating material 16 previously processed into a
fixed shape is set to the shaping | molding die of the cone diaphragm 1, and the cone vibration
plate is then set to the shaping die. It is also possible to obtain a cone diaphragm 1 in which the
heat insulating material 16 is integrated by injecting a thermoplastic resin such as polypropylene
which is a molding material of 1.
[0019]
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Here, the large diameter side of the heat insulating material 16 is equal to or less than half of the
diameter of the cone diaphragm 1, ie, the outer diameter D, and the half of the total height h of
the cone diaphragm 1 from the circular hole 15 side of one end of the cone diaphragm 1 It is
provided to a position not exceeding (50%).
That is, the heat insulating material 16 prevents breakage of the cone diaphragm 1 due to heat
generation of the voice coil 4 and is provided 50% or less, preferably 40% or less of the total
height h of the cone diaphragm 1 Even if it is provided 50% or more, the thermal failure of the
cone diaphragm 1 is not significantly improved, and it is a waste of the material, and if it exceeds
50%, the vibration characteristic of the cone diaphragm 1 is adversely affected. It will come out.
The total height h of the cone diaphragm 1 does not include the height of the edge 13.
[0020]
By the way, one end of the voice coil 4 is adhered and coupled to the cone diaphragm 1 backed
by the heat insulating material 16 by using a thermosetting adhesive or the like at the portion of
the circular hole 15 opened at the center thereof. Because one end side (small diameter side) to
which the voice coil 4 is connected is reinforced by the heat insulating material 16 around the
circular hole 15, the voice coil 4 maintains its fixed shape without deformation even if it
generates heat, and moreover, the cone vibration The heat conduction to the other end edge 13
side (large diameter side) of the plate 1 is blocked by the heat insulating material 16.
[0021]
The heat insulating material 16 is preferably provided on the outer surface 1A of the cone
diaphragm 1 as described above so as not to impair the appearance of the cone diaphragm 1, but
may be provided on the inner surface 1B of the cone diaphragm.
[0022]
FIG. 6 is a schematic view showing the example.
As shown in this figure, in the present embodiment, the inner surface 1B of the cone diaphragm
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is reinforced by the heat insulating material 16.
In this example, the heat insulating material 16 is provided on the inner surface 1B of the cone
diaphragm, and the material and the bonding method thereof are the same as those in the above
example. That is, the heat insulating material 16 is preferably the inner wall surface of the
circular hole 15, or a position not exceeding 50% of the total height h or the outer diameter D of
the circular plate 15 side of the cone diaphragm on the inner surface 1B of the cone diaphragm.
It is provided from the edge to a position about 1/3 of the total height h in the cone diaphragm 1.
[0023]
As mentioned above, although the example of application of the present invention was explained
in detail based on a drawing, the present invention is not limited to the above composition, for
example, the reinforcement by the heat insulating material 16 is applied to the inner and outer
surfaces 1A and 1B of the cone diaphragm 1 respectively. You may do so. In addition to the
paracurved shape, the cone diaphragm 1 may be a straight type (conical cone) or a parabolic
type (parabolic cone). Furthermore, the material of the cone diaphragm 1 is polyester as well as
polypropylene as a thermoplastic resin.
[0024]
Here, to summarize each of the above examples as a final summary, each of the electrodynamic
speaker units is configured to drive a plastic cone diaphragm in which a voice coil is connected
to a small diameter portion with a vibration source including the voice coil. In the electrodynamic
speaker unit, a reinforced portion having a large thickness around the small diameter portion
connecting the voice coil is formed on at least one of the inner and outer surfaces of the cone
diaphragm, and the reinforced portion is formed into a predetermined shape It is comprised by
joining heat insulation materials, such as a paper and heat resistant fiber.
[0025]
Although the present invention is directed to a cone speaker belonging to the moving coil type
among the electrodynamic speaker units, the present invention can also be applied to a dome
speaker having a dome-shaped diaphragm.
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That is, in an electrodynamic speaker unit having a dome-shaped diaphragm, it is conceivable to
reinforce the outer periphery of the diaphragm with a heat insulating material at a connection
portion with the voice coil.
[0026]
As is apparent from the above description, according to the electrodynamic speaker unit of the
present invention, the plastic cone diaphragm is reinforced by the heat insulating material at the
connection portion with the voice coil, so that the voice coil The cone diaphragm does not lose its
shape or damage due to heat generation, and it is possible to maintain good shape at all times
and to express high-quality voice.
[0027]
Further, from the above, not only the sound quality of the speaker can be improved, but also the
output of the speaker can be increased to about 100 W with the conventional 60 W, and the
band can also be greatly expanded.
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