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DESCRIPTION JPS58215200

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DESCRIPTION JPS58215200
[0001]
TECHNICAL FIELD The present invention relates to a vehicle acoustic device, in particular an
acoustic vibrator, which uses an interior panel of a vehicle as a diaphragm for sound. For
example, Japanese Patent Laid-Open No. 54-150119 as shown in FIG. 1 as an acoustic exciter for
exciting the core interior panel of a vehicle acoustic device using the interior panel of this vehicle
as a diaphragm for sound. There is a thing of a statement. That is, in the present embodiment, the
configuration of the acoustic exciter 2 is roughly divided into a magnetic circuit 1 consisting of
three members of a magnet 8, a yoke plate 7.7 and a pole piece 6, and a voice coil 5 placed in the
magnetic field. The bobbin 4 on which the voice coil 5 is wound is erected on the vibrating
portion 3 'of the case 3, and the vibrating portion 3' is mounted on the interior panel of the
vehicle used as a diaphragm for sound. On the other hand, the members of the magnetic net 8,
the yoke plate 7 and the pole piece 6 which are members of the magnetic circuit 1 are fixed to
the non-excitation portion 3 '' of the case 3 via the damper 9. When a signal current flows to the
voice coil 5 through a lead wire (not shown), the voice coil 5 vibrates with respect to the
magnetic circuit 1 identified by the non-excitation section 3 ′ ′ of the case 3, and the voice coil
5 The vibrating portion 3 'of the case 3 to which the wound bobbin 4 is fixed is vibrated, the
entire interior panel closely attached to the vibrating portion 3' is photographed, and
reproduction is performed as in the usual speaker unit. I get a sound. However, in this
conventional vehicle acoustic device, the positional relationship between the bobbin 4 and the
magnetic circuit 1 consisting of the magnet 8, the yoke plate 7 and the ball piece 6 is held by
only one tamper 9. Because of this, the positional relationship between the bobbin 4 and the
magnetic circuit 1 in the non-oscillation direction, which always fluctuates relatively in the
vibrational direction at the time of sound generation, is disadvantageously deviated. As a first
means for solving such a problem, a means for absorbing the total displacement by putting the
fft-wide fork between the bobbin 4 and the pole piece 6 and the yoke plate 7 in advance can be
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considered. However, widening the gap between the two reduces the magnetic influence on each
other and adversely affects the electromagnetic performance and lowers the vibration efficiency.
Also, as a second known solution, there are some that use two dampers to support the magnetic
circuit components of the pole piece rod, but in this structure, the dampers resonate to each
other. It will be accompanied by the disadvantage that abnormal vibration may occur. Therefore,
the first one. There is a need for the emergence of means that can effectively prevent the nonoscillational deviation without the disadvantages of the second means.
The present invention has been devised to meet such a demand, and a magnet, a yoke plate, and
a magnetic circuit component I of a pole piece are attached to a case to which a bobbin is fixed
via a damper. In a resonance exciter, an acoustic exciter is provided by providing a guide on a Nil
bobbin or case for slidably supporting the magnetic circuit component in an excitation direction
driven by a sound 1 q 1 signal. It is an object of the present invention to provide a vehicular
forerunner device Nt capable of preventing the displacement of the magnetic circuit without
adversely affecting the vibration performance of the above. Hereinafter, the configuration of the
present invention will be described according to an embodiment shown in FIG. 2 and below. The
same reference numerals as in the prior art denote the same parts as in the prior art, and a
description thereof will be omitted. In FIG. 2, reference numeral 1 denotes a guide, which, like the
bobbin 4, is erected on the excitation portion 3 'of the case 3. IJ is a ball bearing, a plurality of
balls 10a and a base plate containing a plurality of balls lOa, and is mounted on an outer
peripheral mountain of the yoke plate 7 The balls 10 TL are in contact with the inner
circumferential surface of the guide 11. In the first embodiment according to the above
configuration, with regard to the movement of the bobbin 4 in the excitation direction in the
direction of the arrow (a) shown in the drawing, the ball 10a is transferred on the inner
peripheral surface of the guide 11, The presence of the reference numeral 11 does not disturb
the movement of the bobbin 4 in the same direction, so that the excitation unit 3 'can obtain the
same scratching force as that of the conventional example. However, for the movement in the
circumferential direction, that is, the movement of the magnetic circuit 1 in the non-excitation
direction 91A, the entire circumference of the first yoke plate 7 is in contact with the guide 11
via the ball bearing 10i. Is erected on the same member as the bobbin 4, there is no displacement
in the circumferential direction, that is, the non-oscillation direction between the bobbin 4 and
the magnetic circuit 1. FIG. 3 shows a second embodiment, in which the guide 11 is erected on
the exciting portion 3 'as in the first embodiment, while the outer peripheral surface of the
second yoke plate 7' is shown. For example, the ring 12 which has been subjected to lubricity
processing is fitted by using an accumulated month such as Teflon, and the end inner peripheral
surface of the guide 11 is in sliding contact with the outer peripheral surface. Also in the second
embodiment, the guide 11 can slide on the outer periphery 101 of the ring 12 and the excitation
portion 3 'can not interfere with the presence of the guide 11 in the direction of the arrow <a>. It
can be vibrated, and the vibration in the non-excitation direction, ie, the circumferential direction
is prevented by the guide 11 by the action of + J as in the first embodiment.
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FIG. 4 shows a third embodiment, in which the bobbin 4 is also used as the guide 11. − A ball
bearing 13 containing a plurality of balls 13 & i is fitted in the base 13 b in the phase of the pole
piece 6, and the ball 13 a contacts the inner circumferential surface of the pole piece 6. ing.
Theoretic ball bearing 13 is a nonmagnetic material. In the third embodiment, since the pole
piece 6 is in contact with the bobbin A via the ball bearing 13, the ball 13 a is a bobbin 4 with
respect to the vibration of the bobbin 4 in the direction of the arrow (a). It rolls on the inner
peripheral surface of and its vibration is not disturbed. Further, regarding the deviation in the
non-oscillating direction in the circumferential direction, the pole piece 6 is restricted directly by
the bobbin 4 and the deviation does not occur between the magnetic circuit 1 and the bobbin 4.
FIG. 5 shows a fourth embodiment, and in this embodiment, the damper 9 has its inner
peripheral end joined to the second yoke plate 7 ', the second yoke plate 7 'The magnetic circuit
1 is fixed by supporting. In the present embodiment, the guide 11 comprises a protrusion 15
provided on the inner peripheral wall of the non-excitation portion 3 ′ ′ of the case 3 and a
ball 14 a mounted on the inner peripheral surface of the protrusion 15. The ball 14a is made up
of a base 14t) and a base 14t accommodated in the ball 14ai, and the ball 14a is in contact with
the outer peripheral surface of the magnet 8. In the fourth embodiment, since the guide 11 is not
involved in the bobbin 4 alone, it is possible to obtain the exciting force in the direction of the
arrow (a) in the same manner as the conventional example. With respect to the movement of the
magnetic circuit 1 in the excitation direction, the ball 14 a makes one rotation on the magnet 8,
and the magnetic circuit 1 becomes movable in the excitation direction. In addition, with regard
to the vibration in the non-oscillating direction, the guide 11 (protrusions 15) integrally provided
in the hard non-excitation portion 3 'of the case 3 is in contact with the entire circumferential
surface of the magnet 8. By this contact, the magnetic circuit 1 is prevented from being displaced
in the circumferential direction IIfII, and displacement in the same direction is prevented. As
described above, according to the present invention, there is provided an acoustic vibrator
wherein the magnet, the yoke plate, and the magnetic circuit constituent member of the pole
piece are attached via a damper to a case where the bobbin is fixed. The case is provided with a
guide that supports the magnetic circuit component so as to be slidable in an excitation direction
to drive the magnetic circuit component members by an acoustic signal. It is possible to prevent
the displacement of the magnetic circuit in the non-excitation direction in the non-excitation
direction without disturbing the sound quality and volume of the system without adversely
affecting the sound quality of this kind of acoustic device, It is possible to further improve the
sound jt.
[0002]
Brief description of the drawings
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[0003]
FIG. 1 is an explanatory view showing a conventional sound recorder vibrator, FIG. 2 is an
explanatory view showing a first embodiment of the present invention, and FIG. 3 is an
explanatory view showing a second embodiment, FIG. FIG. 5 is an explanatory view showing the
third embodiment, and FIG. 5 is an explanatory view showing the fourth embodiment.
1 · · · magnetic circuit, 2 · · · acoustic exciter, 3 · · · · · · · · · · · (case) vibration part, 3 '· · · case C) non
7 ttl J 4 ° bobbin, 5 ... voice coil, 6 ... pole piece, 7 ... yoke plate, 9 ... damper, 10 ... ball bearing,
11 ... guide. Figure 1 Figure 2 Figure 3 Figure 4
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