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JPS5674590

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DESCRIPTION JPS5674590
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b are sectional and front views of the
prior art, and FIGS. 2a and 2b are sectional and front views of an embodiment of the present
invention, and FIGS. 3a and 3b. 2 is a cross-sectional view and front view of a second
embodiment of the present invention, and FIG. 4 and FIG. 5 are sound pressure frequency
characteristic diagrams of FIG. 1 and FIG. 2, respectively. 1 ... speaker box, 2 to 4 ... speaker, 6 ...
grill, 7 ... frame, 8 ... resin molded product, 8a. 8b, 8 cm concave, 8 d, Be, 8 f ... convex.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
system and aims to improve the reproduction characteristics by diffusing the sound waves from
the loudspeaker with a clip which covers the front of the loudspeaker box. Conventionally, in the
speaker system, as shown in FIGS. 1A and 1B, the speaker box 1 is attached to the front of the
speaker box 1 at x speaker 2.3.4, and this speaker box 7J ′ ′ ′ ′ ′ ′ ′ ′ ′ The front of
the cup 1 is detachably covered with a grill 5. Generally, the grille 5 is constructed by attaching a
net such as cloth to a frame made of wood or the like, but the sound wave is reflected, diffracted
or absorbed by this net, so the sound of the entire speaker system There is a problem that
pressure frequency characteristics are disturbed. In order to avoid this, it is necessary to select a
material with good sound dropout as the net, and there is also a problem that the price becomes
so high. The present invention provides a speech stem that solves such conventional problems.
An embodiment of the present invention will be described below with reference to FIG. 2 (al, tb).
In FIG. 2, parts having the same functions as those in FIG. Numeral 6 denotes a grill, in which a
molded article 8 of urethane foam resin is attached to a frame made of wood or resin. This
molded product 8 has so-called breathability having a large number of small holes in the
thickness direction, and has a predetermined shape 3 such as a spherical surface or a parabolic
curved surface in a surface r facing the speakers 2 and 3.4. Concave surfaces 8a, 8b and 8c are
formed. In this way, the length of the small holes in the portion where the concaves 8a, 9b and gc
are not formed is the longest, and then the small holes near the periphery in the concaves 8a, 8b
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and 8c and the small holes near the center Because the air resistance is different for each part,
the sound waves emitted from the speakers 2 and 3.4 are therefore concave 8a. It spreads
according to the curvature of 8b and 8c. FIGS. 4 and 5 show old-year frequency characteristics of
the conventional speaker system of FIG. 1 and the speaker system of the embodiment of FIG. 2,
respectively. FIG. From FIG. 5, in the conventional speaker system, the characteristic at a position
distant by 300.45 ° from the axis with respect to the pressure sound of the axis (Qo) is
particularly disturbed in the high region, but in the speaker system of the above embodiment It
can be seen that the high frequency characteristic at a position distant by 300.45 ° is improved,
but as shown in FIG. 3, all of the convex surfaces 8d, 8e, 8f may be completely sunk on the
surface of the molded product 8, Both the front and back sides may be provided with asperities,
and in short, the thickness of each part of the molded product may be made different so that the
four sound waves from the speaker can be diffused in the desired direction.
Of course, the uneven surface is not limited to the sphere-9 parabolic curved surface, and may be
shaped so as to obtain a desired diffusion effect. Alternatively, the krill 6 may be configured by
giving the molded product 8 without using the frame 7. As described in the following-L, the
present invention comprises the grille of a resin molded product having breathable gold, and
diffuses the sound wave from the speaker by providing an uneven surface at a position facing the
speaker. It is possible to improve the high frequency reproduction characteristic by reducing the
disturbance of the low frequency, especially by widening the directivity of the high frequency. In
addition, at festivals where krills are conventionally produced, it is necessary to stick nets to the
frame one by one, so there is the problem that the workability is poor and production can not be
achieved. The work efficiency can be greatly improved because it is composed of the above, and
thereby the cost town can be achieved. Of course, since the durability is also superior to nets
such as cloth and the like, superior effects that can not be expected with conventional grills can
be obtained in terms of quality, performance, and cost.
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