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The present invention relates to a vehicle acoustic device that utilizes various panel members for
interior and exterior of a vehicle as an acoustic diaphragm. As a conventional vehicle acoustic
device, for example, there are devices as shown in FIGS. 1 to 3 (Japanese Patent Application No.
54-135114). First of all, FIG. 1 shows a driver た as an acoustic vibrator, in which the excitation
plate (2) and the cover plate (3) are respectively applied to the front end (FIG. 1 upper and lower)
end faces of the cylindrical frame Are fixed to form a case body, and a yoke (5) having an annular
magnet (4) is disposed at the center of the case body. The yoke (5) is composed of a pole piece
(5a) and a yoke play (5b), which are integrated with the magnet (4) to form a magnetic circuit
having an air gap, and a yoke gray (5b) Are elastically supported by the frame +11 via the
damper (6). Further, a coil (7) wound around a bobbin is disposed in the space portion, and the
bobbin is fixed to the vibration pre- [2) K. And, as shown in FIG. 2 and FIG. 3, the driver D
configured in this way forms an automobile spare cell etc. and is mounted by screwing etc. at the
portion of the panel member (8) K7 frame (1) It is done. As described above, in the vehicle
acoustic device, the driver D is directly attached to the panel member (8) for the interior and
exterior of the automobile, and the entire panel member (8) is used as it is as an acoustic
diaphragm. As the acoustic diaphragm, in addition to the interior and exterior members of the
automobile as shown in the illustrated example, the wall plate etc. of the living room is also used,
and such panel members (8) etc. are made of materials such as compressed cardboard or veneer.
Generally, it is rigidly fixed to a vehicle body or the like at its outer edge or the like. When the
voice signal is supplied to the coil (7), the magnet (4) side and the frame tlJ side, that is, the
excitation plate (2) side vibrates relative to each other through the damper (6). The vibration of
the vibration plate (2) or the like excites the panel member (8) to reproduce the sound. However,
in the conventional vehicle acoustic device as described above, since the entire panel member (8)
is used as the acoustic diaphragm as it is, the plate vibration with the fixing portion as a node
causes a plurality of natural resonances. There is a problem that, due to this natural resonance,
peaks and dips appear in the reproduction output as shown in the reproduction frequency
characteristic of FIG. 4 and the appropriate reproduction bandwidth is narrow, making it difficult
to obtain a wide band. was there. Further, there is a problem that divided vibration occurs in
which each part of the cooling member (8) vibrates in different phases, and the efficiency of the
band portion other than the resonance point (peak point) is low.
The present invention has been made focusing on such conventional problems, a vehicle panel
having fixed inner and outer panel members, a main diaphragm, and an auxiliary diaphragm on
which an acoustic vibrator is mounted. It is an object of the present invention to provide an
acoustic device for a vehicle which solves the above problems by separately molding the
components and connecting them via a flexible sheet with each member. The present invention
will be described below based on the drawings. 5 to 7 show an embodiment of the present
invention. In the drawings, the same parts as in the prior art will be assigned the same reference
numerals and overlapping explanations will be omitted. First, the configuration will be described.
In this embodiment, the panel member (vehicle panel) (9) is a rigid body, and in this rigid panel
member (9), an attachment hole (9 m) having a circular required area as an example is opened. It
is done. The mounting hole (9a) and the K diaphragm 0 are supported by a flexible sheet (I).
Further, the diaphragm a is concentrically divided into two in a center side sub diaphragm (lla)
and an outer peripheral side main diaphragm (llb), and the sub diaphragm (11m) is flexible to the
main diaphragm (llb) Sex sheets are supported through 0 countries. Both the main and auxiliary
diaphragms (lla) (llb) are made of a material that is impermeable to air, such as foam acrylic. The
driver D, which is an acoustic vibrator, is attached to the center side auxiliary diaphragm (lla),
and has the same structure as the conventional one. In operation, this embodiment operates as a
mechanical two-way speaker which is excited by the driver D and has the high frequency limit
frequency fb of the main diaphragm (llb) as the crossover frequency as shown by the following
equation (0). That is, as indicated by the solid line in the reproduction frequency characteristic of
FIG. 8, a frequency band f between the lowest resonance frequency and the high frequency limit
frequency. In -fb, both the main diaphragm (llb) and the sub diaphragm (lla) vibrate, and in the
frequency band higher than the upper limit frequency fb, only the sub diaphragm (lla) vibrates
and the reproduction band is the upper limit frequency It is expanded to the frequency range
above fb. Therefore, flat frequency characteristics can be obtained from the low frequency range
to the high frequency range, and no peak or dip occurs. Here, when the display formula of the
upper limit frequency fb is described, mb: equal mass of the main diaphragm (llb), ma: equivalent
quality of the secondary diaphragm (llB) 1 ksk 3: spring constant of the secondary diaphragm
edge 03 The upper limit frequency fb is expressed by the following equation from the general
equation. Next, in the configuration example in which the diaphragm is divided into two
concentrically as described above, the sub-diaphragm (lla) side should be the diaphragm having
permeability to air as shown in FIG. 7 <14). You can also.
In FIG. 7, (14a) is a frame of FRP (fiber reinforced plastic) as an example, and (14b) is adhered to
the frame (14m) with a cloth. When the sub-diaphragm (lla) is made permeable, the air
movement by the sub-image moving plate (], 1a) is hardly generated above the high frequency
limit frequency fb. The frequency signal is high cut. Therefore, it can be set as a vehicle acoustic
device with a mechanical filter. Next, FIGS. 9 and 10 show a modification of the flexible sheet
connection portion in the present invention. In this modification, one flexible damper (such as a
stainless steel thin plate) (Ie is juxtaposed to the flexible sheet α hot water, for example, at the
flexible sheet connection portion. (16a)はスリットである。 With such a double structure,
the flexible sheet a2 connection 1 portion can be mechanically reinforced, and the peristaltic
plate 01) can be vibrated in a proper holding state at all times. As described above in detail,
according to the present invention, the mounting hole of the required area is opened in the panel
portion, and the sub-diaphragm having the vibration driver attached to the mounting hole, and
the main diaphragm Since the sound pressure can be generated by the piston motion vibration of
the perturbation plate to reproduce the required bass range, the frequency characteristic can be
flattened, the reproduction frequency band can be further expanded, and The effect of improving
the efficiency can be obtained. In addition to the above common effects, the embodiment has the
following effects. That is, according to the embodiment in which the panel member is a rigid
body and the diaphragm is a sub-diaphragm on which a driver is attached and a main diaphragm
on which the sub-diaphragm is supported by a flexible sheet, the sub-diaphragm Can be operated
as mechanical two-way speakers by making them non-permeable or permeable to air, so that
they can function as an expansion of the reproduction zone, or as a vehicle acoustic device with a
mechanical filter. An effect is obtained.
Brief description of the drawings
FIG. 1 is a partial sectional side view showing a part of a driver in a conventional vehicle acoustic
device, FIG. 2 is a plan view showing a conventional vehicle acoustic device, and FIG. 3 is a side
view of the same vehicle acoustic device Fig. 4 is a characteristic curve diagram showing
reproduction frequency characteristics of the above-mentioned vehicle acoustic device, Fig. 5 is a
plan view showing an embodiment of the present invention, Fig. 6 is an end view of Fig. Fig. 8 is
a plan view showing an example of a diaphragm which is permeable to air, applied to the above
embodiment, Fig. 8 is a characteristic curve diagram showing reproduction frequency
characteristics of the embodiment of Fig. 5, and Fig. 9 is this FIG. 10 is a longitudinal sectional
view showing a modified example of the flexible sheet connection portion in the invention, and
FIG. 10 is a view seen from line X-X in FIG.
8: panel member 9: rigid panel member (vehicle panel) 9a: mounting hole 11; diaphragm 11a:
secondary diaphragm 11b = main diaphragm 12.13: flexible sheet 14: permeable to air
Diaphragm 14b: Cross D Nidriver Clarion Co., Ltd. Nissan Motor Co., Ltd. Representative 芦 1)
Direct Figure 1 Figure 2 Figure 3 Figure 5 Figure 6 Figure 7 Figure 8 Fil-IZ)-Figure 9 Figure 10
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