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In a conventional dynamic speaker having a diaphragm made of a polymer film attached to the
ring, the polymer film is simply stretched and attached to the ring, so that the degree of
stretching varies, resulting in a low resonance frequency. Has the disadvantage of not being
stable. The instability is, for example, about 1 kHz ± 200 Hz. In view of this point, the present
invention proposes a method of manufacturing a speaker diaphragm capable of stabilizing the
resonance frequency of a dynamic speaker. In the method of manufacturing a speaker diaphragm
according to the present invention, a diaphragm made of a polymer film stretched and attached
to a ring is heated at a predetermined temperature to obtain a desired resonance frequency.
Hereinafter, with reference to the drawings, an example of the manufacturing method of the
present invention will be described together with the structure of a dynamic speaker made by
applying the manufacturing method. 1 is a plan view of the dynamic speaker, FIG. 2 is a front
view thereof, FIG. 3 is a bottom view thereof, and FIG. 4 is a cross WJrEJ thereof. (1) is a flat
diaphragm made of a polymer film such as l-ester, and is attached (bonded) to the negative
surface of a square metal ring (diaphragm ring) (2). One side of the treatment of this ring (square
ring) (2) is, for example, 4711 m +, and one side of the inner side is 38 mm. The thickness # 'i of
the diaphragm (1) is 12 μm, for example. The vibration plate (1) attached to the ring (2) is
placed on a flat heating table M made of, for example, a metal of iron foil heated by an electric
heater as shown in FIG. Heat the plate (1). When the heat treatment time was changed by
changing the heating temperature F of the diaphragm (1) to the mother meter, the low resonance
frequency of the single diaphragm (1) attached to the ring (2) was measured. The results shown
in the curve diagram of Fig. 6 were obtained. According to this K, if heating at about 100 to 120
°, the low-band resonance frequency of the diaphragm (1) can be stabilized to about 1 kHz (the
frequency as the speaker will be slightly different from this) I understand. A heat treatment time
of at least 5 to 10 seconds is sufficient. (3) is a gasket made of a square ring-shaped rubber and
is attached (bonded) on the ring (2) through the diaphragm (1). This gasket (3) The mounting for
mounting is a surface. (4) In the #i & chair coil device, a cylindrical coil is constructed by winding
the discoil (6) around the outer periphery of one end of the bin (5), The other end of the pin (5) is
attached (bonded) to a predetermined position of the ring (2) @ of the diaphragm (1), for
example, the center.
(7) is a metal frame of a sheet metal (speaker 7 frame), and (8) is a ring attachment portion in the
form of a square ring. Add the attached ring (2) of the diaphragm (1) to the upper surface of the
ring attachment (8) (I! Wear it, but bend its outer periphery to the ring (2) side except for the
corner to form a rising p-rib (9). This rib (9) enhances the mechanical strength i of the frame (7)
and is for rough positioning of the ring (2). Ql is a magnetic circuit attachment portion of a circle
f IJ in the form of a circle (7). The ring attachment 5 (81 and the magnetic circuit attachment
member are integrally connected via a funnel-shaped intermediate portion I having three
triangular windows 0). 0 is an a circuit, a cylindrical magnetic yoke I with a bottom, a cylindrical
permanent magnet (19 mounted at the center of the bottom inside the cylinder, and a cylindrical
pole piece ae mounted above the magnet a9 It is made up of Then, attach the step of the upper
end outer periphery of this brush a4 to the magnetic circuit attachment @ Q (attach (bond) to i of
the frame (7)), and keep the distance between the pole piece αe and the yoke a4 constant. Place
the end of the dubin (5) and the die coil (6) in the air gap. Attach a terminal plate sieve to a part
of the outer periphery of the frame (7) by inserting a rectangular notch aη across the notch aη
in the back 11 of the notch an (attach), the l111 child plate sieve is an intelligent type A pair of
conductive layers (2) and Qυ are deposited on the insulating base & QI. Then, a pair of lead
wires 1 and 2 of the die coil (6) is twisted and extended and bonded from the vicinity of the
center on the back surface of the diaphragm (1) toward the outer periphery, and its end portion
is a terminal plate Soldered to a pair of conductive layers {circle over (0)}, QD for 0 seconds. Also,
this conductive layer {circle around (2)} is soldered to the external lead wire Q4 ° (ハ). A
positioning square hole is bored at the center of the ship edge substrate a9, and is fitted with a
positioning square protrusion protruding from the frame (7). The edge of the terminal plate a8
on the side of the notch a.eta. Protrudes outward from the center of the notch a.eta. So that the
lead wires (i) and Q3 do not contact the frame (7). According to the present invention described
above, since the diaphragm made of a polymer film stretched and attached to the ring is heated,
it is possible to stabilize the resonance frequency (low frequency resonance frequency) of the
dynamic speaker. The instability was, for example, less than or equal to about 1 kHz ± toouz. In
the above-described dynamic speaker, although the diaphragm (1), the ring (2), and the frame (7)
are both made into a square, they can be made into any shape such as a circle or an ellipse. .
Brief description of the drawings
1 to 4 respectively show a plan view, a front view, a bottom view and a cross sectional view of an
example of a dynamic speaker to which the present invention is applied, and FIG. 5 places a
diaphragm attached to a ring on a heating base. 6 is a characteristic curve diagram.
(1) #i diaphragm, (2) ring, M is heating base, (4)? Is coil type fl, (5) box & bin, (61 is die coil, (7)
is frame, (8) is ring mounting portion, (9) rib, 01 is magnetic circuit mounting portion, a3 is
magnetic circuit, Q4 B) Magnetic yokes, a9 permanent magnets, αG pieces i-pieces, aη notches,
餞 are terminal plates, @, (c) are lead wires.
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