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■ A manufacturing method of an acoustic transducer having a foam diaphragm and a molding
die used for the manufacturing ■ Japanese Patent Application No. 43-46265 [Phase] Application
No. 43 (1968) July 4 Priority claim [phase 7] 1967 May 5 Mark Offshore Austria ■ A6244 / 67
Referee 47-159 @ inventor Kutz Schneider-Stria country Wien nots Zack Satsu 4-4 出 願
Applicant N ベ ー B · F · Illitss · Fluir Penham Brink Netherlands Indo-fuen Emasinger 29
[present] Attorney Attorney Sugimura Nobuki 1 person
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of an acoustic transducer made by
the method of the present invention, ie, a cross section of a portion of a speaker, and FIG. 3 is a
partial sectional view of only the foam diaphragm, and FIG. 4 is an enlarged sectional view of the
boundary between the cone 11 and the peripheral portion of the diaphragm, and FIG. FIG. 6 is a
cross-sectional view showing various molds for producing a foam diaphragm according to the
present invention.
Detailed Description of the Invention The present invention manufactures an acoustic transducer
comprising a foam diaphragm of any shape comprising a plurality of parts, such as a neck, a
diaphragm cone, a peripheral part, a support part, etc. on which the coil is mounted. It relates to
the method. In known acoustic transducers of this type, the entire foam diaphragm is made of
foam of a single composition and then the individual parts are treated to change their acoustic or
mechanical properties. For example, after forming the diaphragm using a single mold, pressure
was applied to the peripheral groove and possibly the coil neck to change the foam structure or
some properties in the subsequent [111111] processing step. In the case of changing the
composition of the foam diaphragm depending on the portion, the manufacturing process is
complicated. It is an object of the present invention to provide a method of manufacturing an
acoustic transducer in which the properties of the individual parts of the foam diaphragm can be
selected very simply and in a wide range. . In the foam, the properties can be easily changed by
changing the mixing ratio of the foam forming components as described in detail later. In this
way, very high quality acoustic transducers can easily be built for different requirements. It is
preferred that the part co-operating with the foam diaphragm, such as a moving coil, centering
ring for centering, etc., be directly embedded in the foam. When making three or more mutually
adjacent parts of the diaphragm, it is effective to close the mold part of the third part located
between the two mold parts to the other two mold parts, The foam is injected simultaneously into
the mold part of the two parts adjacent to the third part of the diaphragm. On the other hand, if it
is desirable to make the parts between the diaphragms continuous and not to separate clearly,
use separate molds to make the diaphragm separate parts with foams of different composition. It
is preferred to build. In this type, the mold parts of at least two adjacent parts of the diaphragm
are in direct communication with each other, and each mold part is provided with at least one
inlet for injecting the foam, and adjacent to each other. At the same time, the foam is injected into
the mold part, the expansion coefficient of the foam in each mold part is selected appropriately,
both foams meet at the boundary of both parts, they are connected to each other, or some of
them are mixed with each other Let's do it. The invention further relates to a mold for producing
a foam diaphragm by such a method. If two adjacent parts of the diaphragm are to be made, one
half of the mold parts is arranged to be displaceable relative to the other half, and both halves of
the closed mold part are [111111] EndPage: 1 is made to be in full contact with the mold part of
the adjacent part at a less co-boundary.
Preferably, an adjustable sliding member is provided between the mold portions of two adjacent
parts of the diaphragm, which are actuated to separate the two from each other. The invention
will be described with reference to the drawings. FIG. 1 comprises a magnet arrangement 1
which is built up into a frame 2 which is constituted by a neck 5 and a cone 4 adjacent to it,
supported within the neck 5 by a rim 7 connected to a moving carp, Are fixed to the speaker
frame 2 by the support portion 8. The moving coil 6 is mounted on the diaphragm 3 and
centrally mounted within the magnet assembly 1 by a centering ring (an annular member
defining the center of the coil) 9 made of foam fixed to the speaker frame 2. 5.7.8 and 9 are all
made of foam. In the present invention, some of these parts are made of foamed material of
different composition. Such foams can be constituted by the reaction product of a polyurethane,
ie, a diisocyanate or triisocyanate, with a polyhydroxyl compound, abbreviated as a polyol. The
properties of the foam depend on the two raw materials, which can be varied differently and
which also influence the other properties of the final product, so that hard foams and soft foams
and many foams in between Can be built. The foam structure is provided by the blowing agent
acting during the reaction of the two raw material components. Suitable isocyanate compounds
may be, for example, toluylene diisocyanate when producing flexible polyurethane foams and
diphenylmethane diisocyanate when producing rigid polyurethane foams. The structure and
number of free hydroxyl groups of the polyol determine the final product properties. Polyesters
with many branches produce rigid foams, and linear or less branched polyesters or polyethers
produce flexible foams. Foams made of polyester and tensile strength and breaking strength are
higher but elasticity is smaller than foams made further based on polyether. When many
hydroxyl groups are present in the raw material component, the final [111111] product becomes
hard, and becomes soft when the number of hydroxyl groups is small. The blowing agent can be
carbon dioxide or halogenated hydrocarbons, in particular monofluorotrichloromethane. During
the bubbling process, carbon dioxide evaporates as a reaction product of isocyanate and water.
When monofluorotrichloromethane, which is a low-boiling liquid, is added to the reaction
mixture, it evaporates due to the heat of reaction, thus forming a foam structure. The extent of
reaction and some properties of the final product can be controlled by the addition of catalysts,
accelerators, emulsions, foam stabilizers and the like.
As is apparent from the above, the properties of the foam can be varied by changing the
component composition of the foam. The present invention has been obtained based on such
recognition, and according to the present invention, the cone 4 and the neck 5 of the diaphragm
are made of a hard rigid foam, and the peripheral portion 1, the support portion 8 and the
centering ring 9 Made of soft elastic foam. The specific pore size of the foam and the number of
pores determine the bulk properties, stiffness and damping properties of the diaphragm. In this
way, by stiffening the neck portion of the diaphragm, it is possible to satisfactorily couple
between the moving coil and the diaphragm cone, and by making the diaphragm cone itself rigid,
sound is emitted satisfactorily. It can be resiliently supported on the peripheral portion of the
elastic foam and centering ring. The acoustic characteristics such as the acoustic characteristic
curve, the local resonance characteristic and the attenuation characteristic of such an acoustic
transducer can be easily determined by selecting the composition of the foam constituting the
separate parts of the diaphragm. FIG. 2 shows the boundary between the diaphragm cone and
the peripheral part 1, and the difference in the size and density of the foam cells shows the
different properties of the foam, ie the rigidity of the cone 4 and the elasticity of the peripheral
part 7. It is. As is apparent from FIGS. 1 and 2, the peripheral portion 7 is provided with a
projecting portion 10 at a part of the inner surface of the diaphragm cone 4. -12 can be provided.
The peripheral part 7 can of course also be of other shape and can be a centering ring fiber
material and can be directly embedded in the foam of the neck 5 as well as its inner moving coil.
The support part can also be made as a separate part with foams of different composition.
[111111] EndPage: 2 FIG. 3 shows an example in which the diaphragm is first manufactured, and
then moving coils and centering rings are provided by bonding. In the example shown in FIG. 1,
the composition of the foam between the peripheral portion and the cone was made to differ
clearly, but in this example the foam of the peripheral portion 1 and the foam of the cone portion
4 as shown in FIG. And are continuous. According to such a configuration, the damping
characteristics of the diaphragm can be further satisfied. Next, with reference to FIG. 5, a method
of manufacturing a foam diaphragm having two portions of different composition, ie, a cone 4
having a diaphragm neck 5 and a peripheral portion 7 having a support portion 8 will be
described. . The parts 4, 5 and 7, 8 of the diaphragm are respectively common to 2 [111 111] 2
mold parts. Each half can be made in several parts. The sliding plate 19 can be moved between
the halves 15 and 11 in the direction indicated by the arrow 18 to close the forming space 20
against the forming space 21 of the two parts of the diaphragm.
The half 16 comprises two chambers 22.23, each of which is associated with one part. One or
more inlet conduits 24 ° 25 extend from these chambers to the corresponding molding spaces
'20 and 21 respectively. Two nozzles 26 and 27 are opened in each chamber 22.23. These
nozzles are connected to a conduit for supplying foam material to the chamber. In manufacture,
the slide plate 19 is first closed and, for example, the foam component of the portions 4 and 5 is
injected into the chamber 23 through the nozzle 27. These components are mixed in chamber 23
to form a foam. This foam penetrates into the molding space 21 via the conduit 25 by the
pressure or additional compression agent generated as a result of mixing and is filled there. After
the foam hardens, the sliding piece 19 is raised and connected to the space 20. The foam
component for the part 7 ° 8 is then injected through the nozzle 26 into the chamber 22 where
it forms a foam which penetrates the conduit 24 into the forming space 20 and Be filled. The
foam reaches the boundary 28 of the foam of the other part, which can then be joined and
integrated to divide the mold half next and take out the diaphragm. The foam portion formed by
the inlet conduit 24.25 is then removed to complete the diaphragm. Properties suitable for such
a diaphragm can be obtained using, for example, "Desmorphen TMLA / IJ rLKi 417 J and" Des
Module V44J (trade name), which are commercially available from -9 Yaar rl 11 111 Ruchelsen
Company. A rigid foam can be made using a 1: 1 ratio component of "desmophen TM LA / lJ and"
Desmodur v44 "for parts 4 and 5 and for parts 7 and 8 An elastic foam could be made using
components with a 3: 1 ratio of "desmophen LK 1417" to [Desmod- / l / V44J. Foams can also be
made using three or more components, the composition of the components can be completely
determined according to the required properties. When manufacturing the diaphragm of the
acoustic transducer shown in FIG. Use an I-j [end 6 old 1M] type. This mold has a mold part 29
for the parts 7, 8 so that its half 30 can be displaced by the sliding member 32 in the direction of
the arrow 33 relative to the other half. When the two halves are displaced towards one another,
they completely contact one another in the boundary area 34 and form a closing member for the
forming space 35 for this part. The mold part 36 for the parts 4, 5 comprises a half 37 and a half
consisting of a part 38 and a multipart 39. This part forms a molding space 40 so that the
moving coil 6 can be accommodated in the upper part 41 thereof.
The third mold portion 42 forms a space 45 for the sliding plate 43. This space corresponds to
the part 9 for the centering ring. At least one inlet conduit is opened in each molding space. That
is, the conduit 46 is provided to the space 40 and the common conduit 47 is provided to the
spaces 35 and 45. This is common because these fractions are preferably made of foam of the
same composition. First, the sliding plate 43 and the boundary area 34 are closed. Foam is
injected into the molding space 40 via the supply conduit 46. After curing the foam, the slide
plate 43 is raised and the mold half 30 is lowered by a predetermined distance to open the
boundary areas 48 and 34 to bring the space 45 for the part 9 into contact with the part 5 and
the part 10 The molding space 49 is formed as shown by a broken line. A forming space 35.49
through a conduit 47. The foam is injected 45 and forms the parts 7, 8, 10 and 9 of the
diaphragm, connecting the parts 5 in the border area [111 111] EndPage: 3. According to the
present invention described above, it is possible to freely change the mechanical and acoustic
characteristics at any position of the diaphragm by arbitrarily selecting the composition of the
foam injected into each mold portion, and various requirements can be obtained. High quality
diaphragms can easily be manufactured. The invention is not limited to the examples described
above, but many modifications can be made. In particular, various changes can be made to the
selection of the foam, the production of the foam, the injection method into the mold, the shape
of the diaphragm itself and the like. The invention is also suitable for producing an acoustic
transducer which can be used as a microphone.
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