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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a speaker system using
an acoustic lens device according to the present invention, FIG. 2 is a perspective view of an
acoustic lens device according to the present invention, and FIG. FIG. 4 is a perspective view of a
connector, and FIG. 5 is a cross-sectional view of a portion showing an example of a coupled state
of the connector. 1111a, 11b, 11c and 11d in the figure. 11e is a resistance plate, 14 is a
connector, and 14a is interposed. The portion 14 b is a convex portion, and 14 c is a concave
DETAILED DESCRIPTION OF THE INVENTION In the present invention, a so-called acoustic lens
device K11 installed on the front side of a speaker to diffuse sound waves radiated from the
speaker and used for improving directivity characteristics. The acoustic lens is different in the
path of the propagation path through which the sound wave passes, and the sound wave passing
through is diffused by KJl like the concave lens of the optical system due to the difference in the
path, and the sound wave is scattered around the tube It attenuates and improves the directivity
characteristic of the speaker, and the propagation of the sound wave is 1J / 7yjF7! In order to
form a bottleneck, a plurality of thin plates are arranged in parallel at a predetermined interval in
front of the speaker lIK. For example, dozens of metal 1N bamboo wooden resistance plates are
fixed at an angle of 45 ° to the front of the speaker at a distance of 1 to 25 I at the rim of the
horn of the speaker or on the front of the speaker mounting hole of the speaker cabinet The
structure is such that sound waves pass through and diffuse properly between the resistance
plates, so that each resistance plate can be attached accurately and firmly at the space between
the tatami mats and the strength after assembly is sufficient. It must be fixed so that it can be
maintained. In this conventional acoustic lens device, the positioning member and the fixing
member of each resistance plate are used in a large company shape and having a complicated
structure, which causes heat in the process of assembly, poor workability, i The weight of the
device itself is increased, and the balance with the speaker is disadvantageous such as MIDI In. In
order to eliminate the defects of the present plan #i, the US is f ', the spacing and connection
between the resistance plates are accurately and reliably performed, and the sound wave emitted
from the speaker is properly generated. Diffuse to improve directivity characteristics Tin J; + y ,?
[The purpose of this is to provide a 5K acoustic lens device which can be easily assembled and
assembled. An embodiment of the present invention will be described below with reference to the
drawings. FIG. 1 shows the speaker load using the present invention device. In the figure, the
field is the acoustic lens device according to the present invention, and the center of the front of
the speaker cabinet (2) is opposite to the front of the high sound speaker (3). It is installed. (4) is
a bass speaker, and 151 is an attenuator. Next, the acoustic lens device (1) will be described in
detail with reference to FIGS. 2 to 5811 K. A so-called transmission type acoustic lens device in
which a weight resistance plate shown in FIG. Figure K-Qll ((11), (llb), (llc), (lid), (lie)), and each
resistor & (111) to (lie) has a large number of Holes a2 are formed by a so-called punching plate
with holes n2 and m1 (lla (11 /) to (lie (11 /)) are bent forward at an operating cost angle, and
each paper 4 '1l LIi (11a)-(lli in the middle part from the resistance @ (lla) located on the front 11
to the lie in the backrest lie in the blind gradually decreasing in diameter bite (13 heath, (13b) ,
13+ 澹 (1313, (134), (13e There has been formed of n coaxially.
In addition, the size of the bending angle of each side of each resistance plate (lla) to (lie) (lla
(11e) to (lle) and opening (13m) to (13e) is the desired diffusivity of the sound wave Determined
accordingly. The connection between the resistance plates (lla) to (lle) thus formed, that is, the
space smaller than the wavelength of the sound wave, is polymerized and connected in the frontrear direction by the connector n4. In this coupled body α4J, the engagement convex portion
(14b) is formed on the-bubble surface of the intervening portion (14a) having the same length as
the above-mentioned interval, and the engagement convex portion (14bJ) is formed on the
bubble surface on the opposite side And the corresponding engaging recess (IB) is formed, and
the through hole (151 is provided through the engaging recess (14) from the engaging convex
portion (14b) in the concentric direction of the intervening portion (14m) There is. -Insertion
holes (16a) (lsa) (lsb) (16c) (16d) (16e) into which the connecting members (+ 41 holding convex
portions (14b) are inserted at the 4th branch point of the universal ring plate (lla) to (lie) Are
provided to polymerize between each resistance plate (lla) to (lie). Therefore, in order to connect
the resistance plates (11 m) to (lle), for example, the first connection body a4 from the surface
side of the resistance plate in the last stage (each insertion hole of 11 1 Insert the engaging
convex part (14b), make it project to the front side, fit the engaging concave part (14C) of the
second connection body 1a to the protruding part, insert the resistance plate (11e) into the
insertion hole (16e) Of the connecting member I at one side of the connecting member I (one end
face of the pair 14 and the other end face, and then inserting the next stage resistance plate (lid)
as the holding convex portion (14 b) of the second connecting member I Holes <16 d) Insert K
and engage recess (14 c) of third coupling body ff 41 in the same manner as described above! Fit
and hold the resistance plate (lid). The acoustic lens til + is constructed from K by holding and
connecting the resistor fj (lie) at the rear stage of the experimental bell and the resistor plate
(1131) at the front stage of the umbrella from the connector * 41K. This circle t111! A screw
wholesaler is inserted from the front into the through hole 0 which is communicated by the
fitting between the connectors and the connectors 141, and a speaker unit frame (one on one
side). In the present example, the foremost connecting body α-bw that is fitted to the convex 11
(14b) of the connecting body 0.41 that protrudes 1 on the front side of the frontmost resistance
plate (lla) is also one eyebrow IIK The recess (14 is formed so that the gA portion (171) of the
screw a71 is inserted into the recess K). In addition, the connection between the connecting
members (14 may be adhesively fixed by interposing an adhesive in the fitting of the convex
portion) · 5 parts (14b) and the concave portion 11 (14e), and the connecting member f 141 is
made of 8M material When forming by this, the horse surface of the convex IB (14 b) and the
concave portion (14 c) may be melted, pressed in, and fixed by welding.
In the case of welding, as shown in FIG. 5, the connecting body alt) concave 11 (14c) # i port 111
# convex II (14 b) jt large 11 taper in the direction of the back side to form a taper Is desirable.
As described above, when the acoustic lens device 111 is fixed to the speaker unit frame 0 in the
case where the connectors α 轡 are fixedly connected to each other, the connector I at the rear
end is fixed to the speaker unit frame side. Is unnecessary, and in this case, the last connected
body I can be integrally provided in the unit frame a. Furthermore, in this example, each side of
the resistive tlL plate (111-(lie) (lla-(li There is an intervention. This pregnancy shift body 9 is
formed of a resistance plate (111 to (a little longer than the distance between IHIJ, n, this is
continuous (two pieces of material ''),. IN (l 1m) to (lie) K every other sheet, ie, through holes
provided approximately in the middle between the side portions (llb ') of the resistance plates
(llb) and (lid) (llb and (ttc) (11c') (S) Each of K penetrates and is interposed between each
resistance plate in a compressed manner, and resistance plates (11a) to (lie) f) both sides 1f (lla)
(11m ') to (11 @ s) (11e) ') Vibration absorption damping. Further, although five resistance plates
(11m) to (lie) are used as the resistance plate On of the device il + of this embodiment, the
number of the resistance plates a can be increased or decreased to any number as required. .
Further, in the case 4 where the distance between the resistance plates (lla) and (lie) is different,
it is sufficient to use a connecting body a41v having a length that matches the distance. In the
acoustic lens device (1) of this example configured as described above, since the openings (13a)
to (13e) of the respective resistance plates (lla) A- (lie) are communicated at the central portion,
the acoustic resistance is There is almost no increase in acoustic resistance due to the increase in
the number of superposed sheets 1i (lla) to (lle) due to the difference in the aperture diameter of
the openings (13a) to (13e) toward the peripheral part Therefore, after passing through the case
apparatus 11j, the sound wave emitted from the speaker becomes a spherical wave-like radiation
due to the difference in acoustic resistance of the above 17+), and the directivity is improved.
Note that the present invention is not a scale in which a resistive plate as shown in the illustrated
example is disposed in an overlapping manner in the front-rear direction with respect to the
speaker i. All of the acoustic lens devices such as acoustic lens devices to be installed can be used
for the acoustic lens device which throws m at predetermined intervals.
As described above, according to the present invention, in the acoustic lens device formed by
superposing the number of resistance plates at a predetermined interval, the convex portion is
formed on the surface of one eye with a length corresponding to the accompaniment interval
between the resistance plates, A connecting body having concave portions corresponding to the
convex portions in the opposite direction is disposed with the convex portions and the concave
portions facing each other on both sides of each resistance plate, and the convex portions and
the concave portions are fitted. As a result, each resistance plate is held and connected in
sequence, so that each resistance plate can be connected accurately and firmly at an interval
corresponding to the required distance, and the connection operation can be made extremely
easily by 2 FI and productivity can be achieved. Since the configuration is significantly improved,
and the connector line shape is small and the configuration is simple, the device integral can be
formed as a percentage of 8 (8) 1111, and the speaker can be used without applying
unnecessary load to the speaker etc. It is easy to balance with other things, and increase or
decrease the number of resistance plates Directional characteristics according to the listener's
preferences can linked to one addressed any without drips <it has an effect such as obtained.
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