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DESCRIPTION JPH04111597

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DESCRIPTION JPH04111597
[0001]
<Industrial field of application> The present invention relates to an electrodynamic speaker used
for various audio devices. <Prior Art> Conventionally, a thin electrodynamic loudspeaker has
been constructed as shown in FIG. That is, the doughnut-shaped magnet 1 is placed on the upper
surface of the yoke 2 in which the pole piece 3 is provided in the center, and the top plate 4 is
placed on the upper surface of the magnet 1. Form the magnetic gap 5 and fix the 3-22 on the
frame S! In the peripheral portion of the rim 8, a normal reverse diaphragm 10 having a central
portion projecting forward in a cone shape is fixed via an edge 9, and the gradually contracted
end of the diaphragm 10, that is, the diaphragm The base end of the coil bobbin 6 in which the
voice coil 7 is held between the magnetic gaps 5 is attached to the central portion thereof, and
the cover 11 is fixed to the peripheral front surface of the frame 8. In the second embodiment,
the peripheral edge of the damper 12 supporting the proximal end of the coil bobbin 6 is held,
and further, the dust cap 13 is crowned on the upper end of the coil bobbin 6. Further, as
another conventional example of the thin-shaped dynamic speaker, as shown in FIG. 4, the
mounting position of the damper 12 in FIG. 3 is changed. That is, the damper support 4 is
integrally projected on the top surface of the top plate 4 near the magnetic gap 5, the inner
peripheral edge of the damper 12 is attached to the damper support 4 °, and the outer
peripheral edge is the diaphragm 10 By attaching to the middle position, the diaphragm 10 is
held. <Diameters to be solved by the invention> In the case of the speaker of 31 W, the damper is
located in front of the diaphragm (the side to which the sound wave propagates), so the sound
wave emitted from the damper interferes with the vibration of the voice coil. The sound is
distorted. Further, in the example of FIG. 4, as shown in the schematic view of FIG. 5, the
diaphragm 10 of the speaker is generally supported by two supporting members (springs) such
as the edge 9 and the damper 121. The bobbin 6 of 7 is prevented from tilting. Therefore, to
stabilize the operation of the voice coil, an edge and a damper 12. It is important to take a large
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interval a. However, in the speaker of FIG. 4, since the edge is at the outer peripheral edge of the
diaphragm and the damper is attached at the middle between the outer peripheral edge and the
inner peripheral edge of the diaphragm, the distance between the edge and the damper can not
be increased. It is difficult to stabilize the operation of In the present invention, in order to solve
the above-mentioned problems, the central part of the diaphragm is made convex backward, and
the voice coil and the magnetic circuit on the coil bobbin are disposed in the central front of the
diaphragm. And the damper 3S is disposed behind the moving plate.
Because the damper is behind the diaphragm, the sound wave emitted from the damper along
with the vibration of the voice coil is blocked by the diaphragm and the edge and the front 1! It
does not propagate to the storage position and does not distort the sound from the diaphragm.
Further, since the edge can be provided on the outer peripheral edge of the diaphragm and the
damper can be attached further to the rear via the inner peripheral edge of the diaphragm or the
coil bobbin, a large distance between the edge and the damper can be secured. Operation is
stable. The present invention will be described in detail with reference to the embodiment shown
in FIG. 1 and FIG. 2. In FIG. 1, the magnetic circuit is located on f & 111 of the yoke 2a in which
the pole piece 3a protrudes from the center rear. , Next to the donut shaped magnet 1a! The top
plate 4a is attached to the rear portion through the magnet, and the external magnet type
magnetic circuit 14 is configured through the magnetic gap 5a formed between the inner
peripheral portion of the top plate 4a and the pole piece 3a. Do. The upper surface of the yoke 2a
is fixed to the frame 8a, and a peripheral edge 9a of a cone-shaped diaphragm 10a which
protrudes rearward at the center rearward of the pole piece is attached to the downward rim of
the frame. Attach the voice coil 7a between the magnetic gap 5a at the center of 10a and close to
the rear end of the coil bobbin 6a, and stick the outer edge of the damper 12a to the edge of the
cover 11m attached to the frame edge The voice coil is held between the magnetic gaps 5a
without eccentricity by connecting the central portion of the damper 12a to the rear end of the
coil bobbin. A dust cap 13a is attached to the lower end of the coil bobbin 6a. FIG. 2 shows an
example in which the outer magnet type magnetic circuit of FIG. 1 is replaced with an inner
magnet type magnetic circuit 14 ', and different points (the same reference numerals indicate the
same configurations and the explanation is omitted) are different Attach a yoke 2b to the front of
1b, and a pole piece 3b on the back side of the mag-out 1b! -Constructed by gluing. Then,
similarly to the above, the magnetic gap 5a is formed between the rear end inner peripheral
portion of the coke 2b and the pole piece 3b, and the voice coil 7a is interposed between the
magnetic gaps. With such a configuration, the edge can be attached to the front outer periphery
of the diaphragm, and the damper can be disposed behind the diaphragm, and the damper is
extended to the inner periphery or further to the rear of the diaphragm Since it can be attached
to the end of the voice coil bobbin, the distance between the edge and the damper can be
increased, and the operation of the voice coil is stabilized.
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2
Furthermore, if the frame and the shape of the magnetic circuit are well designed, it can also
have the effect as a diff user. As described above, in the electrodynamic speaker of the present
invention, the central portion of the diaphragm protrudes to the rear, the voice coil and the
magnetic circuit are disposed in front of the diaphragm, and the damper is the diaphragm.
Rearward positioning prevents the distortion caused by the damper and stabilizes the diaphragm,
thereby stabilizing the movement of the voice coil and improving the sound quality and the input
resistance performance. Have.
[0002]
Brief description of the drawings
[0003]
1 and 2 show an embodiment of the present invention.
FIG. 1 is a half sectional view of the speaker, FIG. 2 is a half sectional view of the speaker
showing the other embodiment, and FIGS. 3 to 5 show a conventional example. FIG. 3 is a half
sectional view of an electrodynamic type single-use speaker, FIG. 4 is a half sectional view of the
other speaker, and FIG. 5 is a conceptual view of a voice coil supporting system. 6a: coil bobbin,
7a: voice coil, 8a: frame, 10a: diaphragm, 12a, damper, 14: external magnet type magnetic
circuit, 14 °: internal magnetic type magnet circuit
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