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JPH0435399

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DESCRIPTION JPH0435399
[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 kinds of audio equipment such as television receivers and
automobiles. 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. 6 is a perspective view of the above-mentioned
conventional speaker device. In FIG. 6, reference numeral 1 denotes a housing, which has a baffle
plate 2 and a reflector 3 at the top and bottom. Further, when the sound absorption member 4 is
disposed at two places between the top and bottom surfaces of the housing 1 and the reflection
plate 3 and the cover 5 is fixed to the housing 1 by low frequency welding or screwing, the
sound conduit 6 is configured. At the same time, the opening 7 is formed. The area of the
opening 7 is smaller than the area of the baffle plate 2, and the speaker unit 8 is attached to the
rear surface of the baffle plate 2, and the cabinet 9 is fitted and coupled. The operation of the
loudspeaker apparatus configured as described above will be described below. First, when an
input signal is applied to the speaker unit 8, the diaphragm vibrates and a sound wave is emitted
from the opening 7 through the sound path 10 inside the sound conduit 6. However, since the
acoustic impedance is largely changed at the opening 7, a part of the sound wave is reflected and
returns to the sound path 10, and a standing wave is formed. Become. However, the sound
absorbing material 4 disposed inside the sound conduit 6 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 4 plays an important role in the
reproduction principle of this type of speaker device. Also, the reflection plate 3 acts so that the
sound emitted from the diaphragm is not directly absorbed by the sound absorbing material 4.
SUMMARY OF THE INVENTION However, in the above-described conventional configuration,
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after the sound absorbing material 4 is disposed inside the housing 1, the housing 1 and the
cover 5 are fixed by either low frequency welding or screwing. There is. Each of the methods of
fixing has various problems. First, when the housing 1 and the cover 5 are fixed by low
frequency welding, a low frequency welding machine is required. Since this low frequency
welding machine is very expensive, the equipment depreciation cost is high. Also, the low
frequency welding process, including the setting of the housing 1 and the cover 5 and the
removal 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. Furthermore, since low frequency welding requires a jig for fixing
the housing 1 and the cover 5, the time required for the start of production is extended by the
production period of this jig Makes the product cost high. Furthermore, if the housing 1 and the
cover 5 are not completely welded, there is also a quality problem in that the cover 5 partially
contacts the housing 1 and the reflecting plate 3 to generate an abnormal sound called a flicker.
On the other hand, when the housing 1 and the cover 5 are fixed by screwing, a cushioning
material such as urethane foam or non-woven fabric is interposed between the housing 1 and the
cover 5 so that the cover 5 does not contact the housing 1 directly. I have to. This cushioning
material is essential to suppress the occurrence of the flicker. However, in this case, cushioning
material is stuck to housing 1 or cover 5 and sandwiched, but this pasting requires a lot of manhours for the work and also requires material cost of cushioning material, so it is very expensive.
Moreover, in order to screw-fix the cover 5 which has a large area, it must be screwed in about
20 places (it will take a lot of man-hours, and there is a big problem that a product cost is pushed
up). Summarizing the above, in the case of low frequency welding, the number of production is
limited, and the expense of equipment and jigs and maintenance costs increase the product cost,
and there are also quality problems. In the case of screwing, there is a problem that the cost for
setting material and the need to screw at many places are increased, so that the number of steps
is increased and the cost is increased. The present invention solves the above-mentioned
conventional problems, does not require expensive equipment, and does not require cushioning
material, and therefore provides a low-cost, low-quality, excellent-quality speaker device. is there.
Means for Solving the Problems In order to solve these problems, the speaker device of the
present invention integrally forms the baffle plate, the reflection plate and the sound conduit by
injection molding of resin, etc., and the top surface of the sound conduit and A sound absorbing
material insertion box is provided between the bottom surface and the reflection plate to arrange
the sound absorbing material, and a cover serving as a lid of the sound absorbing material
insertion box is provided with claws to be hooked and temporarily fixed to the sound conduit. A
plurality of ribs in the direction to push up the outer periphery of the cover are provided on the
portion where the outer periphery of the cover and the sound absorbing material insertion box
come into contact with each other, and the outer periphery of the cover and the sound absorber
insertion box An adhesive or the like is applied to the boundary portion of the periphery to fix
the cover, the speaker unit is mounted on the rear surface of the baffle plate, and the cabinet is
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fitted and coupled.
With the above configuration, the sound absorbing material insertion box and the cover provided
in the sound conduit will be strongly hit only in the portion of the rib provided in a large number,
and the other parts will be completely separated. There is no occurrence of abnormal noise called
In addition, since it is connected to the sound conduit by the claws provided on the cover, and
the adhesive is applied and fixed to the outer peripheral portion of the cover, the expensive
material and the jig as described in the prior art are not required. Because it is unnecessary, it
can be finished extremely cheaply. 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 a speaker device according to an embodiment of the present invention. In
FIG. 1, the baffle plate 11, the reflection plate 12 and the sound conduit 13 are integrally formed
of resin, and the sound absorption material insertion box 14 is provided between the top and
bottom surfaces of the sound conduit 13 and the reflection plate 12 Insert 15 and place. Further,
the cover 16 serving as the lid of the sound absorbing material insertion box 14 is provided with
the claws 17, fitted in the hook holes 18 provided in the sound absorbing material insertion box
14, and temporarily fixed to the sound conduit 13. Further, a large number of triangular ribs 19
are provided around the sound absorbing material insertion box 140 to push up the outer
peripheral portion of the cover 16. Then, the hot melt adhesive 20 is applied to the temporarily
fixed outer peripheral portion of the cover 16 and the peripheral boundary of the sound
absorbing material insertion box 14 to completely fix the cover 16 (in the figure, the upper
sound absorbing material insertion box 14 is a cover The lower side shows the state in which the
cover 16 is fixed). On the other hand, the speaker unit 21 is attached to the rear surface of the
baffle plate 11 so that the cabinet 22 is fitted and coupled. Next, the state in which the cover 16
is coupled to the sound absorbing material insertion box 14 will be described. FIG. 2 is a partial
perspective view showing a state in which the cover 16 is fixed to the sound absorbing material
insertion box 14. In FIG. 2, the triangular rib 19 pushes up the outer peripheral portion of the
cover 16, and the outer peripheral portion of the cover 16 and the peripheral portion of the
sound absorbing material insertion box 14 are completely separated at places other than the rib
19. There is. FIG. 3 is a partial cross-sectional view showing a state in which the cover 16 is fixed
to the sound absorbing material insertion box 14. Also in FIG. 3, the triangular rib 19 works to
push up the outer peripheral portion of the cover 16 so as not to contact it. Further, raising the
peripheral portion of the sound absorbing material insertion box 14 is useful because it prevents
the hot melt adhesive 20 from flowing out and controls the adhesive application position.
Furthermore, it is better to reduce the thickness of the outer peripheral portion of the cover 16.
In the operation of the speaker device configured as described above, the sound absorbing
material 15 suppresses the occurrence of standing waves in the sound conduit 13 by its sound
absorbing effect as in the conventional example, and the reflection plate 12 vibrates the speaker
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unit 21. The sound emitted from the front of the board is prevented from being absorbed directly
by the sound absorbing material 15. Further, since the ribs 19 push up the outer peripheral
portion of the cover 16 so as not to be in contact with the sound absorbing material insertion box
14, no abnormal noise called "billing" is generated. Furthermore, the hot melt adhesive 20
secures the air tightness in the sound conduit 13 and is harder than a rubber adhesive, so it
works excellently in fixing the cover 16 and has a fast curing time, so it is extremely effective for
this kind of adhesion. It works effectively. As described above, according to the present
embodiment, the provision of the triangular ribs 19 for pushing up the outer peripheral portion
of the cover 16 around the sound absorbing material insertion box 14 eliminates the need for
cushioning material, and moreover, like a low frequency welding machine. It is excellent in the
quality without abnormal noise generation without using a large-scale and expensive equipment,
moreover, the number of man-hours can be small (it can be produced inexpensively). Next, the
arrangement of the ribs 19 will be described. In the case of the triangular rib 19 described in the
above embodiment, the process of temporarily fixing the cover 16 is better when it is positioned
approximately between the claws 17 of the cover 16 and the claws 17 adjacent thereto. Further,
although the triangular rib 19 is provided on the peripheral portion of the sound absorbing
material insertion box 14 in the above embodiment, it may be provided on the outer peripheral
portion of the cover 16. This state is shown in FIG. FIG. 4 is a partial cross-sectional view showing
a state in which triangular ribs 23 are provided on the outer peripheral portion of the cover 16
and fixed to the sound absorbing material insertion box 14. The rib 23 prevents the outer
peripheral portion of the cover 16 from being pushed up and coming into contact with the sound
absorbing material insertion box 14. In the above embodiment, the triangular rib 23 separates
the cover 16 and the sound absorbing material insertion box 14, but other rib shapes may be
used. The rib shape will be described with reference to the drawings. FIG. 5 is a perspective view
in which a convex rib 24 is provided on the outer peripheral portion of the cover 16. This convex
rib 24 also acts to separate it from the sound absorbing material insertion box 14. It is desirable
that the position of the rib 24 be in the vicinity avoiding the claw 17. Needless to say, a rodshaped bottle may be used instead of the convex rib 24. Although the closed type cabinet is
illustrated in the embodiment, the same applies to a bass reflex type or other reproduction type.
Further, a speaker unit for high-pitched sound reproduction may be added. Effect of the
Invention As described above, according to the present invention, the cover serving as the lid of
the sound absorbing material insertion box is provided with the hooks to be hooked and
temporarily fixed to the sound conduit, and the cover is pushed up to the portion where the
cover and the sound absorbing material insertion box contact. By providing the ribs in the
direction, it is possible to realize a speaker device of excellent quality at low cost, since
cushioning material is unnecessary and expensive equipment such as a low frequency welding
machine is not required.
[0002]
Brief description of the drawings
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[0003]
FIG. 3 is a cross-sectional view of FIG. 3. FIG. 4 is a cross-sectional view of the main part of the
speaker apparatus according to another embodiment of the present invention. FIG. 6 is a
perspective view of a cover of a speaker device according to another embodiment of the present
invention, and FIG. 6 is a perspective view of a conventional speaker device.
11 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · sound conduit, 14 · · · ·
sound absorbing material insertion box, 15 · · · · · · Material
················································································································ 20 Hot melt adhesive Agent. Name of
agent Attorney Attorney Shigetaka Hino and 1 other town
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