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JPS5892194

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complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5892194
[0001]
In the present invention, grooved ribs are radially provided on an outer shell body integrally
formed with a component having a rim provided on the periphery and a conical or cylindrical
drive transmission body, and this is used as an aggregate in 1 surface material The present
invention relates to a disc type diaphragm with a drive transmission body formed by joining plate
members in which a core and a core material are joined. In the case of a disk-shaped diaphragm,
in order to increase its resonance frequency □, (a) a sand-inch structure is used to increase the
plate thickness and increase the bending rigidity while suppressing an increase in weight by one.
(B) Drive a node circle of an appropriate order that occurs at free resonance of the disk. () ·) The
above (i) and (ii) are used in combination. The method is used properly depending on the
purpose. An example of use of the above () S) will be described with reference to FIG. FIG. 1
shows that a drive cone 4 is joined by an adhesive 5 to a sandwich structure board in which a
surface member 2-1.2-2 is joined by an adhesive agent 5-1.5-2 to the surface of a lightweight
core member 1 Indicates the situation. For the outer edge of the drive cone 4, a nodal circle
diameter of an appropriate order is selected from the nodal circles generated at the time of free
resonance of the nine disks, but in general, the first nodal circle diameter is selected. In the sandin-in-place vibrating plate, a core material is made of nickel foam 1 foam \, three-dimensional
netlike metal, etc., and an aluminum alloy foil, fiber reinforced plastic sheet, etc. is used as the
surface material. According to this structure, the transmission of the force from the drive cone 4
to the surface material 2-1 serving as the sound wave emitting surface in FIG. It becomes as
follows. That is, first, the force is an adhesive for joining the drive cone 4 and the surface
materials 2 to 2 on the back side from the drive cone 4. Back side surface material 2-2. Adhesive
for Joining Surface Material 2-2 on Back Side and Core Material 1 3-2. Core 1. And the adhesive
6-1 for joining the core material 1 and the surface material 2-1 on the sound wave emitting
surface side is sequentially transmitted to the surface material 2-1 on the sound wave emitting
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surface side. However, the inclusions of the force transmission path show viscoelastic behavior
except for one surface material, and the transmission loss is large. The large transmission loss
causes a decrease in the resonant frequency of the disk-shaped diaphragm. In order to solve this
problem, a structure as shown in FIG. 2 has been proposed. In order to simplify the power
transmission path, this integrates the drive cone and a part of the back surface of the sand-in
structure, and further provides an upstanding rim on the circumference of the back surface. A
shell 7 is formed, and a core plate 6 and a face plate 8 provided with an upright rim at one
circumferential portion inside the outer shell 7 are mounted and bonded. However, in this
structure, even if there is a reinforcing effect of the diaphragm by the upstanding rim of the
circumferential portion, only a resonant frequency almost equivalent to the structure of FIG. 1
can be obtained.
There is also a method of bonding the reinforcing ribs with an adhesive to increase the bending
rigidity, but this method has a disadvantage that it causes a mass increase with the increase in
the number of parts. Does the object of the present invention be a high rigidity structure with
less force transmission loss without the above-mentioned disadvantages of the prior art? An
object of the present invention is to provide a disc type diaphragm with a drive transmission
body which can be easily manufactured. In order to achieve the above object, in the present
invention, in order to simplify the force transmission path, the same force transmission path as
that shown in FIG. 2 is provided, and a reinforcing lip is provided on the outer shell by integral
molding. Thus, the rigidity is enhanced without increasing the number of parts and the mass.
Next, an embodiment of the present invention will be described. 6 and 4 show the basic
construction of the diaphragm with a drive cone according to the present invention, and FIG. 6 is
a perspective view of the outer shell 10 and FIG. 4 is a longitudinal sectional view of the whole. .
First, one kind of metal foil such as aluminum or aluminum alloy titanium was selected, and it
was made by this spot molding or stretch forming. Simultaneously make a part of the back plate
integral with the drive cone and a rim standing upright on the circumference of the back plate,
and simultaneously add several reinforcing ribs 11 radially to either or both of the back plate
and the drive cone. The core member 6 and the face plate 8 shown in FIG. 2 of the prior art are
attached to and bonded to the outer shell '10 to form the outer shell 10, and the radial shown in
FIG. A disc-shaped diaphragm having a partially sandwich structure with a driving cone for
containing a reinforcing lip. A concrete embodiment of the present invention will be described
below. A predetermined molding type is used as a molding material of a 15 μm thick corrosionresistant aluminum foil as a molding material of the sound wave-side surface side surface plate 8
and a corrosion-resistant aluminum foil of a 30 μm thickness as a molding material of the outer
shell 10. Hold a temperature of 240 to 270 ° C, spray a gas heated to 250 ° C to 600 ° C, an
EE force of 2 to 201, and press the material to be molded against the molding die. A shaped 5
face plate 8 and an outer shell 10 were obtained. なお。 Temperature and pressure depend on
the thickness and shape of the material to be molded. An appropriate value can be selected from
the above range of values. The outer diameter of the shell 10 thus obtained is 50 m. The
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peripheral rim has a height of 1.9 g, the diameter of the drive cone opening is 65 m1 and the
height of the cone is 5 8, and there are 8 groove-like reinforced ribs with a depth of about im
radial It is. Further, the outer diameter of the surface plate 8 on the sound wave emitting surface
side is 49.13111. The height of the circumferential lip is 2 wl. Subsequently, bulky [o, o4 to O,
045 g / (4 plastic foams are pressed into the inner plate portion of the surface plate 6 obtained
above, and the core material 6 is obtained.
Here, the surfaces in contact with each other are bonded by the adhesive layer 9-1. Next, a hard
adhesive layer 9-2 is provided on the corresponding portion of the shell 10 in contact with the
face plate 8, the face plate 8 is attached thereto, and the adhesive is cured by heating to form an
outer shell. 10 and the surface plate 8 were assembled to obtain a diaphragm of the subject. The
weight of the diaphragm was o, s g, and the high resonance frequency was 7, 5 kHz. The above
explanation is based on the case where a drive cone is used as a drive transmission body, but the
same effect is obtained in the case where a voice coil is wound around a cylinder instead of a
cone. can get. As described above, according to the present invention, according to the present
invention, the outer shell body provided with the groove-shaped lip on the one side of the disc
construction portion provided with 1 inch on the periphery and the drive transmission body
integrally is simply processed. By making a disc-shaped diaphragm with a drive transmission
body by using this as an aggregate, it is possible to obtain a high-rigidity vibratory plate with
little or no transmission loss of force.
[0002]
Brief description of the drawings
[0003]
FIG. 1 (a) is a cross-sectional view of a diaphragm in which a conventional sand-inch-type
diaphragm and a drive cone are joined, and FIG. 1 (b) is a partial cross-sectional view showing
the details of the joint portion A in FIG. Fig. 2 (a) is a cross-sectional view of a disc-shaped
diaphragm with a drive cone in which a surface plate is joined to the inside of an outer shell
integrally formed with a conventional rear surface body and a drive cone, Fig. 2 (b) FIG. 6 is a
partial cross-sectional view showing the details of the joint portion B of FIG. 6A, FIG. 6 is a
perspective view showing an outer shell in one embodiment of a disc shape diaphragm with a
drive cone according to the present invention; FIG. 7 is a cross-sectional view in the direction of
FIG. 6 0 C, in which a surface plate is joined to the outer shell of FIG.
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Explanation of symbols 6 · · · Core material 7 · · · Outer shell 8 · · · surface plate 9-1.9-2 · · ·
adhesive layer 10 · · outer shell 11 · · · reinforced lip o 1-year 2 (b) 131 1-4
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