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JPH04172796

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DESCRIPTION JPH04172796
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker apparatus provided with a sound conduit on the front surface of a diaphragm of a
speaker unit used for various audio devices such as a television receiver and a car. 2. Description
of the Related Art In recent years, a speaker apparatus using a sound conduit having a
rectangular opening smaller than the area of a baffle plate on which a speaker unit is mounted
has been widely used. FIG. 8 is a partially exploded perspective view of the above-mentioned
conventional speaker device. In FIG. 8, 1 is a housing, which has a baffle plate 2 and reflectors 3
at upper and lower two places. The cushioning material 4 is attached to the peripheral portion of
the housing 1 in an L shape. Further, the sound absorbing material 6 is disposed at two places
between the top surface and the bottom surface of the housing 1 and the reflecting plate 3 and
the cover 7 is fixed to the housing 1 by the screws 6 to form the sound conduit 8 and at the same
time the opening 9 is formed. It is done. The area of the opening 9 is small on the surface of the
pan plate 2 and on the bottom surface of the pan plate 2, and the speaker unit 10 is attached to
the rear face of the buckle 2 and the cabinet 11 is joined. The operation of the loudspeaker
apparatus configured as described above will be described below. As a result, when an input
signal is applied to the speaker unit 10, the diaphragm vibrates and a sound wave is emitted
from the opening 9 through the inside of the sound conduit 8. However, since the acoustic
impedance is changed at the opening 9 by a dog, a part of the sound wave is reflected and
returns to the inside of the sound conduit 8 to form a standing wave, and thus the reproduced
sound is extremely disturbed by the peak dip. It becomes pressure frequency characteristic.
However, the sound absorbing material 6 disposed inside the sound conduit 8 absorbs this
reflected wave, suppresses the generation of the standing wave, and produces a flat reproduction
sound pressure frequency characteristic. That is, the sound absorbing material 5 plays an
important role in the reproduction principle of this type of speaker device. Still, the reflecting
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plate 3 prevents the sound emitted from the diaphragm from being absorbed directly by the
sound absorbing material 5. Next, another conventional example will be described with reference
to the drawings. FIG. 9 is a perspective view of another conventional speaker device. In FIG. 9,
the cover 7 is fixed to the housing 1 by low frequency welding to constitute the sound conduit 8
and at the same time the opening 9 is formed. The difference from the conventional example is
that the cushioning material 4 and the screw 6 are eliminated, and the cover 7 is bath-fitted to
the housing 1 instead. Next, the operation of another prior art example is omitted because it is
the same as that described in the prior art example.
SUMMARY OF THE INVENTION However, in the above-described conventional configuration, the
cover 7 is not in direct contact with the housing 1 by sandwiching the cushioning material 4
made of urethane foam or non-woven fabric between the housing 1 and the cover 7. It is screwed
and fixed. The cushioning member 4 is essential for the cover 7 to be in partial contact with the
7-case 1 to suppress the generation of an abnormal sound called "billing". However, since the
work of bonding cushioning material 4 to the backing 1 requires man-hours, and the material
cost of cushioning material 4 is also required, there is a big problem of raising the product cost.
On the other hand, when the cover 7 is low frequency welded to the housing 1, a low frequency
welding machine is required. Since a wooden low frequency welding machine for welding the
cover 7 of a large area is very expensive, the equipment cost is high. Furthermore, the low
frequency welding process, including the setting of the housing 1 and the cover 7 and the taking
out of the product after welding, takes 30 seconds or more. That is, there is also a problem that
the number of production is limited by the ability of the low frequency welding machine. In
addition, since low frequency welding requires a jig for holding the housing 1 and the cover 7,
the time required to start production of this jig becomes long, and the cost of manufacturing the
jig is long. Maintenance costs make the product cost high. In addition, if the housing 1 and the
cover 6 are not completely welded, there is also a quality problem that partial contact occurs and
flicker occurs. SUMMARY OF THE INVENTION The present invention solves the above-mentioned
conventional problems, and provides a speaker device which is inexpensive and excellent in
quality without requiring cushioning materials, requiring a small number of man-hours, and
eliminating the need for expensive equipment. Means for Solving the Problem In order to achieve
this object, the speaker device of the present invention is provided with a convex insertion
portion having some notches in the periphery of either one of the housing or the cover, and the
other periphery The part has a concave insertion part, and the insertion part has several walls
connecting the both walls of the concave part and several projections for sandwiching the
insertion part, and has a notch and a wall. And the housing and the cover are engaged and
screwed to form a sound conduit. By having the above-described structure, the projection
provided on the inner side of the recess holds the projection of the fitting portion. Since the other
parts are completely separated, no abnormal noise called flicker occurs even if they vibrate. Also,
the wall connecting the two walls of the recess of the insertion portion prevents the recess from
opening outward, and works to keep the distance between the protrusions.
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In other words, the projection sandwiches the projection of the insertion portion with a constant
pressure. Furthermore, since the wall connecting the both walls of the recess acts to keep the
distance between both walls of the recess constant, the gap between the walls of the recess is
narrowed due to the deformation called warpage by providing it at an appropriate pitch. As a
result, it does not come in contact with the convex portion, and therefore, it is possible to prevent
the flicker. As a result, as described in the prior art, since the cushioning material is not required,
it can be finished inexpensively. In addition, since it is not necessary to employ the low frequency
welding method, expensive equipment and jigs are not required, and investment can be reduced.
Embodiments Hereinafter, one embodiment of the present invention will be described with
reference to the drawings. FIG. 1 is a partially exploded perspective view of an embodiment of
the present invention. In FIG. 1, the housing 12 has a baffle plate 13 and reflecting plates 14 at
upper and lower two places, and a peripheral edge of the housing 12 is provided with a convex
fitting portion 16 having several notches 15. is there. In addition, a concave fitting portion 18 is
provided on the periphery of the cover 17, and the fitting portion 18 is provided with several
walls 19 connecting both walls of the concave portion, and a projection 2o for sandwiching the
fitting portion 16 There are several. Further, the sound absorbing material 21 is disposed at two
places between the top surface and the bottom surface of the housing 12 and the reflecting plate
14, and the fitting portion 16 of the housing 12 and the fitting portion 18 of the cover 17 are
fitted and fixed by screws 22. The sound conduit 23 is configured. Further, a speaker unit 24 is
mounted on the rear surface of the baffle plate 13 and a cabinet 26 is coupled to constitute a
speaker device. Next, the insertion portion 16 of the housing 12 and the insertion portion 18 of
the cover 17 will be described in some detail. Fig. 2 is a partially enlarged perspective view
showing the insertion portion 16 of the housing 12 and the periphery thereof. In the figure, 15 is
a notch and 16 is a fitting part. FIG. 3 is a partially enlarged perspective view showing the fitting
portion 18 of the cover 17 and the periphery thereof. In FIG. 3, the wall 19 connecting the both
walls of the recess is provided slightly behind the end face 26 of the recess. Further, the
projections 20 have a semicircular arc shape and are disposed in a pair at the top and the bottom
so that the two may face each other, and are provided on both sides in the vicinity of the wall 19.
The connection of the insertion portion 16 and the insertion portion 18 brings the wall 19 and
the notch 15 into alignment, and the projection 20 sandwiches the insertion portion 16 from
above and below for engagement. FIG. 4 is a perspective view of the speaker device in which the
housing 12 and the cover 17 are fitted and the sound conduit 23 and the opening 27 are formed
by the screws 22. In the operation of the speaker device configured as described above, the
sound absorbing material 21 suppresses the occurrence of standing waves in the polyphonic
conduit 23 due to its sound absorbing effect, as in the conventional example, and the reflecting
plate 14 is the speaker unit 24. The sound is directed to the opening 27 by preventing the sound
emitted from the front surface of the diaphragm from being absorbed by the sound absorbing
material 21 directly.
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Further, the wall 19 connecting the both walls of the recess provided in the fitting portion 18
functions to keep the interval of the recess constant, and the interval between the pair of upper
and lower opposing protrusions 2 o is maintained. Since the projection 20 sandwiches the
convex fitting portion 16 from the top and the bottom, the other parts are completely separated,
and no abnormal noise called flicker occurs even if they vibrate. Further, by providing the wall
19 for every 2511 111 to 50, it is possible to prevent the distance between the two walls of the
concave fitting portion 18 from being narrowed due to deformation called warpage, and contact
with the convex fitting portion 16 And there is no chance for it to happen. Moreover, since the
fitting surface is indented, it is possible to secure a certain degree of air tightness although it is
not perfect. As described above, according to the present embodiment, the peripheral portion of
the housing 12 is provided with the convex insertion portion 16 having the notch 16, and the
cover 17 (7) is provided with the concave insertion portion 18 and both walls. By providing the
wall 19 to be coupled and the projection 2 o facing the housing 12 and fittingly coupling it with
the housing 12. No cushioning material is required, and without using large and expensive
equipment such as a low frequency welding machine. It is possible to inexpensively produce a
product excellent in quality without occurrence of abnormal noise. Next, the insertion portion 16
and the notch 16 and the wall 19 and the projection 2o of the insertion portion 18 will be
described first, although the insertion portion 16 and the notch 16 will be described first, but
FIG. 6 is an enlarged perspective view thereof It is. In the figure. It is better for the fitting that the
width W of the tip of the notch 15 is thicker than the root @ W2 L, (L> W2) and the rounded end
28 is provided at the tip. Further, if the depth of the notch 16 is made shallow from the fitting
surface, the airtightness is improved. FIG. 6 shows the cross-sectional shape of the insertion
portion 16. In the drawing, it is better to provide a slope on both sides of the insertion portion 16
so that the tip becomes silky, and to provide a rounding 29 at the tip. FIG. 7 is a cross-sectional
view of the insertion portion 18. In the figure, reference numeral 19 denotes a wall connecting
both walls of the recess, and reference numeral 20 denotes a projection. The protrusion 20 has a
semicircular arc cross section, a semicircular arc at the tip, and a roundness 3Q at the entrance
of the recess for better fitting. In addition, the opposing projection 20 is provided with a slope in
the direction in which the inlet spreads, and this slope is the same as the slope of the convex
portion of the insertion portion 16. Furthermore, the distance between the opposing projections
2 o is slightly smaller than the thickness of the convex portion of the insertion portion 16. On the
other hand, the height of both walls of the recess of the fitting portion 18 is useful because the
sound absorbing material 21 can be prevented from biting into the fitting portion by increasing
the height h of the inner wall.
In the embodiment, a convex fitting portion is provided on the housing side, and a concave fitting
portion is provided on the cover side. Conversely, a concave fitting portion is provided on the
housing side, and a convex fitting is provided on the cover side You may comprise a part.
Further, although the closed type cabinet has been illustrated in the embodiment, it may be a
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bass reflex type or another reproduction type, and the same effect can be obtained without
coupling the cabinets. Furthermore, a speaker unit for high-pitched sound reproduction may be
added. Effect of the Invention As described above, the present invention comprises the housing
provided with the convex insertion portion, the cut-in portion, the wall connecting both walls of
the concave insertion portion and the concave portion, and the projection sandwiching the
insertion portion. By fitting the cover and forming a sound conduit, no cushioning material is
required, and expensive equipment such as a low frequency welding machine is not required, so
a speaker apparatus of excellent quality can be realized at low cost. It is.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partial exploded perspective view of the speaker device according to an embodiment
of the present invention, FIG. 2 is a perspective view of the insertion portion of the speaker
device, FIG. 3 is a perspective view of the insertion portion of the speaker device, FIG. The figure
is a perspective view of the same speaker apparatus, FIG. 6 is a perspective view of a more
effective insertion portion, FIG. 8 is a partial exploded perspective view of the conventional
speaker device, and FIG. 9 is a perspective view of another conventional speaker device.
12 ииииии Housing, 15 ииииииииииииииииииииииииииииииииииииииииииииииииииииии 18 Inserted part; .... Walls, 20 ..... Projections.
Name of agent Attorney Attorney Osamu Kojima and 2 others Figure 4 Figure 6 Figure 7 Figure
9
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