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JPS57148990

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DESCRIPTION JPS57148990
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
ribbon speaker, FIGS. 2 to 4 show an embodiment of the present invention, and FIG. 2 is a cross
section showing the main part of the ribbon speaker FIG. 3 is an exploded perspective view of a
vibration system unit constituting a part of the speaker of FIG. 2, and FIG. 4 is a cross sectional
view showing a modification of the vibration system unit. DESCRIPTION OF SYMBOLS 10 ...
Permanent magnet, 11 ... Yoke, 12.22 ... Vibration system unit, 12a ... Ribbon-shaped diaphragm,
12b, 22b ... Damping material, 12c ... Frame, 12d ... · · Patzkin material, 13 · · · stop.
DETAILED DESCRIPTION OF THE INVENTION In the present invention, a ribbon-shaped
diaphragm made of a conductive metal foil alone is disposed in the magnetic gap of the magnetic
circuit, and the diaphragm eyes 7, 9 pA 1110 I? . The present invention relates to a ribbon type
speaker in which a diaphragm is vibrated to emit a sound by supplying a signal current to the
body. A conventional loudspeaker is constructed as shown in FIG. 1. In the figure, 1 is a
permanent magnet, 2 is a pair of yokes constituting a magnetic circuit together with the
permanent magnet 1, and g is a magnetic gap formed between the yokes 2. Reference numeral 3
denotes a ribbon diaphragm disposed in the magnetic gap C, and reference numeral 4 denotes a
damping material made of a visco-elastic material interposed between both sides of the ribbon
diaphragm 3 and the spacer 3. In this conventional speaker, in order to assemble the vibration,
system, and three units in the magnetic circuit and assemble the speaker, the narrator 3 itself is
set in the magnet 11g of the assembled magnetic circuit, and the diaphragm 3 and the yoke 2 are
assembled. It is necessary to put together the gap between them with the damping material 4,
and it is necessary to directly handle the diaphragm 3 which is extremely fragile and easy to
form. For this reason, when assembling, the handling of the diaphragm-1 is as follows. This has
led to a decline in costs and an increase in costs. The present invention has been made in view of
the above-mentioned point, and its purpose is to facilitate the installation of the vibration system
to the magnetic circuit to improve the productivity and thereby to reduce the cost. It is in
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providing a ribbon type speaker. An embodiment of the present invention will be described
below with reference to FIGS. 2 to 4. FIG. 2 shows the main part of the replacement bon type
speaker according to the present invention, in which 10 is a permanent magnet, 11 is a pair of
main members 1 and 11 constituting a magnetic circuit together with a permanent-stone 10; A
magnetic gap G is formed between the 1-vote 110 facing portion. Reference numeral 12 denotes
a vibration system unit installed in the step 11 'of the facing portion of the main P-11. As can be
seen from the exploded perspective view of FIG. 3, the vibration system unit 12 has a ribbonshaped diaphragm 121L made of a conductive metal foil male body such as an aluminum foil or
beryllium foil having a thickness of about 107 IR. A damping material 12b made of a visco-elastic
film for vibratably supporting the diaphragm 12 &, a frame 120 for supporting the diaphragm
12 & through the damping material 1211, an imaging plate 12 & steel and a steel 12 for the
frame 120 And a pad material 12a joined to hold the moving material 12b. The damping member
12kH1 and the diaphragm 12 The diaphragm 12111 is welded to the crucible 1211 after being
overlapped with the diaphragm 121 so that the window hole 12b 'drilled to reduce the total
weight of the diaphragm 12 and the turtle is closed. Is integrated with the diaphragm 12 &.
Frame 12011, for example, made of nonmagnetic, well-conductive metal plate or other material
such as Als-, whose surface is electrically insulated 4, and whose thickness is slightly smaller
than the width of diaphragm 12 & A wide window hole 120 'is opened. The attachment of the
diaphragm 12 & to the frame 12G is performed so that the diaphragm 121L crosses in the
longitudinal direction of the window hole 120f by welding or bonding the periphery of the
damping material 12b to the frame 120. In the window hole 12C 'of the frame 12G, when the
diaphragm 12 & attached to the frame 120 vibrates as described above, the damping material
12b is partially wrinkled at the corner of the window hole 120'. There are notches 120 'at each
of the four corners to prevent any problems. 511トへ−。 The packing material 1211 is made
in the same shape as the frame 120 by a material having elasticity to some extent, such as paper,
resin veneer or foamed resin, and the four corners are notched at the center like the window hole
12cl. The opened window 12α 'is opened. The packing material 12d is crowned with the frame
12G so as to squeeze the film of the damping material 12b and the diaphragm 12m. The
vibrating yarn Y = y12 constructed as described above is installed on the step 11 'so that the
frame 120 comes into contact with the main yoke 11, and thereafter the frame 13 is used as a
yoke. The magnetic circuit is assembled by holding 120 and the packing N12d between the step
11 '. For this reason, it is not necessary to handle the diaphragm 1 directly, because the assembly
to the magnetic circuit will not be handled directly, and the productivity will be the same, and the
cost can be reduced. Of the unit attached to the frame does not occur, and by the fact that the
frame made of a metal plate is in contact with the yoke, the heat generated by the diaphragm is
effectively transmitted to the yoke through the frame. Heat is dissipated, and the allowable input
of the sneaker is measured. In the embodiment described above, an insulating material is used as
an auxiliary material, but as shown in FIG. 4, the diaphragm 1211 is disposed on the frame 120
so as to cross the window hole 12C 'of the frame 12c in the longitudinal direction. After that,
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both sides of the diaphragm 12a are supported by the frame 120 by the damping material 22b
formed by applying the viscous filler so as to fill the gap between the window hole 12o 'and the
diaphragm 12m. Also 'IIIG) good. The unit 22 configured in this manner is attached to the
magnetic circuit through the packing material 1211 in the same manner as the anastomosis in
FIG.
Note that the packing material 12L1 may be bonded so as to be integral with the frame t2C, but
when attaching the knit, the patching material 12L1 is held together with the frame 120 between
the stopper 13 and the step 11 'of the yoke 11. Therefore, even if it is not adhered, it does not
occur. Further, although in the above embodiment 1) and the stopper 13 are used as a sea yoke
to thereby form a part of the magnetic circuit, the stopper 13 is used for an anastomosis in which
such a thing is not necessarily required. It can also be made of materials other than magnetic
materials. As described above, the present invention is a ribbon-shaped diaphragm made of a
conductive metal foil alone and a damping material for this diaphragm. 1) Vibration system unit
composed of a frame to be supported by a screw 9: 'Belt, the frame is inserted between the yoke
and the stopper via a span so that the frame contacts the yoke of the magnetic circuit. By being
held in the magnetic circuit. For this reason, the magnetic circuit and the vibration system unit
can be assembled separately, and in assembling the vibration system unit, the diaphragm is
supported by the small heavy wire frame via the damping material compared to the magnetic
circuit. Since it is only necessary, an assembly method that can be performed without direct
handling of the diaphragm such as automatic assembly can be adopted. In addition, even when
the vibration system assembled as a unit is assembled to the magnetic circuit, it is not necessary
to handle the diaphragm directly, so that the productivity can be improved and the burst down
can be measured. Furthermore, the use of the packing enables the mounting of the unit to be
carried out without causing any abnormality such as a bill-actually $), and the heat dissipation of
the diaphragm is efficiently performed by the contact between the frame and the frame, and the
speaker A lot of practically superior effects can be obtained, such as an increase in tolerance
input can also be measured.
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