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3 Detailed Description of the Invention □ The present invention relates to a porous magnet plate
and a method for producing the same, and more particularly to a porous sintered magnet plate
suitable for use as an electrical sound converter and a method for producing the same. Coping,
electric signal! Although there are many types of electro-acoustic transducers for converting into
sound, such as electrostatic scissors and electric a-types, the present invention relates to the
conversion of the electric a-type transducers. As a transducer such as a headphone, for example,
a permanent magnet plate in which a large number of small holes are bored is magnetized in a
circular shape, and it is disposed close to two identical poles facing each other, and vibration is
made between them. Transducers having a plate interposed as their main component are known.
However, it is difficult to use the above-mentioned magnet plate to form a porous structure, and
it is difficult to use a sintered magnet such as a ferrite or rare earth cobalt based magnet having
good magnetic properties, and a porous rubber magnet disk having poor magnetic properties
and mechanical properties. Is used. However, if the faces of two porous rubber base magnets are
magnetized and arranged with the same poles facing each other so that the same poles repel
each other, the diaphragm is interposed between them, the porous rubber magnet The board is
easy to deform due to its low rigidity. Further, since the rubber magnet is obtained by kneading
magnet powder such as ferrite into a rubber medium, the magnetic properties are extremely low.
Furthermore, the rubber magnet is iaj '! It has the disadvantage of demagnetizing at relatively
low temperatures. It is obvious that the above problem is that high magnetic properties and high
rigidity phi magnets, such as sintered ferrite magnets such as yc, can be cultivated by using rare
earth EndPage: 1-class cobalt-based magnets. However, there are many difficulties in making thin
porous magnet plates with these magnets. A commonly considered method uses gold made of an
upper pan with a large number of pins erected and a lower punch having holes for aligning these
bins, and the powder raw material for sintered foundation stone is the final product The mold
will be filled and compression molded by an amount corresponding to the thickness and diameter
of the porous magnet plate, and finally the necessary baking will be performed. Since the porous
magnet plates used in electro-acoustic transducers are required to have a small hole diameter
and a small hole distance, the pins and holes of punches in upper molds should be compact, 't
The interval between must be small. However, it is VA * to align the lower punch with the upper
punch having a large number of pins arranged at small intervals, so gold and molding machines
are required to have high precision, which significantly increases the product cost. When the
diameter of the pin is reduced, the pin bends at a molding pressure (α5-4, O) // ai necessary for
molding the powder for a sintered magnet.
If at least one of the pins fails, the upper punch of the mold becomes unusable. Accordingly, it is
an object of the present invention to provide a method of manufacturing a porous magnet plate
which overcomes the prior art and the above-mentioned defects and can be mass-produced
inexpensively. . A more specific object of the present invention is to make the mold and the
molding machine not require high precision by a novel method which has not been tried so far,
to make the manufacture of the mold easy and to have a long life, machine and An object of the
present invention is to provide a porous magnet plate having excellent electrical characteristics.
Another object of the present invention is to provide a double-legged nine-hole magnet plate of
characteristics. The method of the present invention is summarized as follows: Powders for
magnets such as ceramic powder for ferrite magnets, powders for seasonal earth-cobalt based
magnets, etc. Powders are pressure-condensed into plates of any other shape. At the time of
compression molding, an upper punch having a large number of tapered pins at its tip is used,
and a large number of small holes which do not lead to penetration of the animal body are
formed on one side of the plate-like body. The plate-like compact is then fired at a predetermined
temperature to form a rigid sintered magnet plate. Finally, the above-mentioned small hole is
made into a through-hole of a predetermined diameter size by grinding and grinding from the
surface on the side without the sintered magnet sheet small hole. The advantage of the method is
that it uses relatively thick tapered pins, so the mold is easy to manufacture, the pin is strong, the
mold accuracy is low, and the S is suitable for dragon production . Furthermore, the advantage of
the item obtained by this method is that the rubber magnet has much better properties as
compared with the rubber magnet, and it has good mechanical% -resistance that is high in
rigidity and hard to receive the influence of magnetic field and vibration. It is. 1) The porous
magnet plate of the present invention is particularly uniform in mechanical properties and in air
properties as shown in 2. That is, using the above-mentioned high V # degree forming wedge and
making a large number of through holes (in forming a thin plate in the case of forming a plate), it
is possible to use gold of powder for magnet. Since the filling of the mold is likely to be uneven,
the mechanical strength and magnetic properties of the product (causes variations. In the present
invention, the first nine layers are first molded thick and fired, and then polished to obtain the
required thin plate thickness, so there is no local variation in density, and both magnetic and
mechanical. It has excellent characteristics. The invention will now be described in detail with
reference to the drawings. Referring to FIG. 1, the upper bunch 1 and the lower punch 2
respectively support the movable relative movement of the molding machine. The bolt is fixed to
the ls5 bolt. The upper / i-punch has many tapered pins 5 set up from a flat substrate 4.
On the other hand, the lower punch 2 is in the form of a mere container. The pins of the upper
punch can be easily manufactured by arranging them in a matrix form as shown in FIG. For
example, because the thickness of the board 4 and the height of the pins 5 is the same, it is
possible to cut off the material between the pins from the strength steel material to the bite and
arrange as shown in FIG. It is very easy to j out. For example, a square or square, for example, has
a large number of pinks having a circular cross section and is planted on the substrate 4 and
then cut in the same manner as described above)-cutting off a predetermined tapered pin by
grinding is there. In this case, it will be apparent that the planting position of the pin before
cutting may not be exact. Since the pin is tapered, the base of the pin has a diameter large
enough to withstand the pressure during compression and pressure so that it can be broken
EndPage: 2. By making the tip of the upper pacice 1 tapered pin 5 minus, there is almost no
molding pressure applied to the powder material between the tip of the pin 5 and the lower rim,
and thus the pin is not damaged. (A sufficient molding pressure is applied between the flat
portion of the punch 1 and the lower punch. And, it is very easy to pull up the upper punch.
Returning to FIG. 1, the powder 6 for sintered magnet such as powder for ferrite magnet is filled
in the space of the lower punch 2. The amount of powder loaded into the lower punch is
substantially larger than that required for the final product, for example, an amount of t5-3 is
used. Next, the upper punch 1 is lowered as shown in FIG. 3 to apply a compression molding
pressure. The pressure is .alpha..sub.5 -4.0) // as an example, but of course it can vary depending
on the powder. Because of the large powder loading, the force applied from the upper and lower
punches is dispersed throughout the filling, resulting in a homogeneous, compact, one-piece
compact. Next, the plate-like molded body is charged into a firing furnace according to a
conventional method and firing is performed until a predetermined i-type is obtained. The
resulting nine-plate-like molded body is shown in FIG. Next, the lower surface side (FIG. 4) of this
sintered magnet plate is ground by a grinder until a predetermined through hole is obtained.
mlS! The top and bottom surfaces are finished and polished according to the above to obtain
a finished stone plate of a predetermined thickness. The finished magnet plate is shown in FIG.
Next, the magnetic properties of the porous magnet plate obtained by the present invention are
shown. In an isotropic barium ferrite disk having a diameter of 50 ° and a thickness of 2.5 °,
tapered through small holes were formed in a lattice shape such that the distance between the
small holes was 41-. The shape of the tapered through small hole is a square-shaped tapered hole
whose diameter on one of the five surface sides is 35 and the diameter on the other surface side
is 1-. In this ferrite disk, the magnetic flux Fi 1 α 22 kilomax well of the magnet disk when
alternately magnetizing the N pole and S pole alternately from the surface side with the smaller
hole diameter to the five poles is the larger hole diameter The surface magnetic flux when
magnetized in the same manner as above from the surface side of the surface is 1907 Km.
By arranging the vibrating film on the side of the magnet disk with a smaller hole diameter, the
sound output of the vibrating film is increased, and the shape of the hole is tapered to diffuse the
vibrating air pressure of the vibrating film to the outside. It is easy to do, and it is possible to
reduce mechanical acoustic impedance and to make it more efficient. The sintered magnet plate
of the present invention has no local variation in magnetic properties and mechanical properties
and has much better magnetic properties and mechanical properties than rubber magnets. If you
use the above method, you can get the benefits of fcs. FIG. 1 is a partial cross-sectional view
showing the first step of the method of the present invention, FIG. 2 is a bottom view showing an
example of an upper gench used in the present invention, and FIG. 3 is a second view of the
method of the present invention. FIG. 4 is a cross-sectional view of a pressed plate-like molded
body, and FIG. 5 is a cross-sectional view of a completed sintered magnet plate. 1: Upper punch,
2: Lower punch, 4: Substrate, 5: Pin, 6: Powder for @ upper, '= y = s Agent's name Motohiro
Kurauchi Doujin Kurahashi, 2- FIG. 5 囚 EndPage: 3 list of attached documents (1) specification 1
(2) drawings (correct) 1 山) power of attorney and translation 4 1 1 7-2 Other inventors, patent
applicants or agents other than the above Person's agent address Chuo-ku, Tokyo Nihonbashi 3chome, No. 3-11, Fat and oil industry hall the third floor (phone number 273-6436)-1 name
(7563) patent attorney Ken Kurahashi EndPage: 4
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