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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. 4A and 4B are longitudinal
sectional views of one example and another example showing the arrangement of the braking
body, FIG. 5 is a perspective view of one example of the braking body, and FIG. 6 is a perspective
view of another example of the braking body. 11. in the figure. lla, llb, 11c, 11d! . 11e is a
resistance plate, 14 is a connector, and 1T or 1r is a brake.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called
acoustic lens device which is installed in front of a speaker 11111 and used to improve the
directivity characteristic for diffusing sound waves radiated from the speaker. The acoustic lens
device differs in the path of the propagation path through which the acoustic wave passes, and
due to the difference in the path, the acoustic wave passing through is refracted and diffused like
the concave lens of the optical system. In order to form a sound wave propagation path, a
plurality of thin plates are disposed in parallel on the front side of the speaker at predetermined
intervals. For example, the rim of the speaker horn or dozens of metal i17 / '/// Fi / 1 λ-' / or
one or two wooden resistance plates in front of the speaker castle hole of the speaker cabinet Is
fixed so as to form an angle of 45c 'with the front of the speaker with a gap between them, but
since the resistance plate is a thin flat plate, the resistance plate itself is the sound pressure or
baffle plate due to the sound wave emitted from the speaker. The vibration of the woofer or the
like is directly transmitted to cause vibration, and in this case, there is a disadvantage that the
vibration resistances of the respective paper plates are different and the directional frequency
characteristic is deteriorated. Therefore, the present invention was made to solve the
conventional drawbacks, and it is possible to prevent the vibration generated in each resistance
plate by interposing a damping body made of a visco-elastic material on the free edge side
between the resistance plates. The present invention provides an acoustic lens apparatus which
improves braking frequency characteristics by uniformly braking different resistances in each
resistance plate and absorbing them as internal loss. An embodiment of the present invention will
be described below with reference to the drawings. FIG. 1 shows a speaker system using the
device according to the present invention, in which ill is a meeting lens device according to the
present invention mounted on the front surface of the speaker cabinet (2) corresponding to the
front surface of the quotient speaker (3) There is. (2) 1 (4) is a low volume speaker, (5) is an
attenuator. Next, the acoustic lens device (1) will be described in detail with reference to FIGS. 2
to 5. In the illustrated device, so-called transmission-type acoustic lens devices in which resistive
plates are sequentially arranged forward at predetermined intervals. It is. In the figure, Qυ ((lla),
(llb), (llc), (lid), (lie)) is a resistance plate, and each resistance plate (llM) to (lie) has a large
number of through holes α2 over the entire surface One side (lla'bar 12'J-(11e ') (lle')) formed
by a so-called punching plate drilled is bent forward at the required angle: i. Also, in the middle
part of each resistance plate (lla) to (lie), the resistance located on the outpost & from (lla) to i!
Openings (t3a) and (13b) that gradually decrease in diameter to the resistance plate (lie) located
at lI. (13C), (13d), and (13e) are formed concentrically. Note that the size (ha ') (1ta') to (ile 'bar
1e #) of each resistance plate (lla) to (lie) and the size of the opening (13a)-(13e) are sound
Desired diffusion of the skin is simply commingled. The resistance plates (lla) to (lie) J2r formed
in this way are connected in the front-rear direction by the connector u4) at a required interval of
15p #, that is, a small interval compared with the wavelength of the sound wave. (3) Place 1 child
4 A holding convex part (14b) is formed on one end face of the interposition part (141) having
the same length as the above-mentioned interval and the coupling body I is engaged on the end
face on the opposite side An engagement recess (14C) corresponding to the portion (14b) is
formed, and a through hole t151 is provided to penetrate the engagement recess (14C) from the
engagement protrusion (14b) in the concentric direction of the intervening portion (14a) It is
done. On the other hand, the resistance plates (11m) to (lie) K have insertion holes (16a) (16b)
(16c) (16d) (16e) in which the engagement convex portion (14b) of the connector I is inserted at
41 @. Between each resistance plate (11a) and (lie), it is provided so as to polymerize. Therefore,
in order to connect the resistance plates (lla) to (lie), for example, the holding convex portion
(14b) of the first connected body u41 from the rear surface side to each insertion hole (16e) of
the last resistance plate (He) Insert and project to the front side, fit the engagement recess (14C)
of the second connection body I into the projection, and place the resistance plate (lie) on the
periphery of the insertion hole (16e) of the inner connection body I Hold by one end face and the
other end face of the intervening part (14 heat), and then insert the engagement convex part
(14b) of the second connector t141 into the insertion hole (16d) of the next stage resistance
plate (lid), Same as above! lc! The engagement concave i1 (14C) of the I3 coupling body 14
is fitted to hold the resistance plate 1-1) 1 (7) (lid). In this manner, the coupling members I are
sequentially superposed and connected at required intervals from the last-stage resistance plate
(lie) to the first-stage resistance plate (lla). In addition, vibration during shooting between the free
ends of the respective resistance plates (lla) to (lie) connected in one way, that is, between both
sides (lla ') (11a') to (11e ') (11e ") The vibration damping body qη is interposed at a portion
corresponding to the maximum width portion. As an example of this vibration damping body 11
せ ん, a rubber thread ring I 19? The viscoelastic substance having the characteristics forms a
frusto-conical shape slightly longer than the distance between the resistance plates (11a) to (lie
J), which are continuous in two through the groove u8.
This continuous braking body (Iη is placed on every other resistance plate, ie, on both sides of
second and fourth resistance plates (llb) and (lid) (llb ') (llb') and (lid ') (lid') Through holes (IIK)
which are drilled through the holes (IIK respectively) to engage the groove and intervene in a
compressed manner between the resistance plates (lla) to (lie). Let both sides (lla ') (11a')-(lie ')
(lie') (vibration) of the both sides (lla) of each resistance plate be absorbed. In addition, the
intervening direction to the resistance plates (lla) to (lie) of this lateral rod is in a straight line (5)
burn 1- 謔! Intermittently as shown in FIG. 4B without limitation, or in addition, interposed
braking bodies a? The number of) may be increased. In addition, the damping body (17 ') of
another example has resistance to the columnar piece (17'a) formed of a viscoelastic material as
shown in FIG. 6 at a distance slightly wider than the distance between the resistance plates (11m)
to (11e) The thickness of the plate has formed a slit □ of equal width, and this damping body (17
') is formed by both resistance plates (11m) to (lie) @ 1iill (11M') (lla ') to (lie' (11e #) is inserted
from the edge side thereof into a corresponding resistor plate (resistors (llb) to (lid)) which is a
slit so as to interpose in a compressed manner. The acoustic lens device (1) of the present
example configured as described above is fixed to the speaker unit frame 123 by inserting the
screw Q か ら from the front into the through hole housing 9 communicated by the fitting
connection of the connectors I. When sound waves radiated from the speaker pass through the
device 111 of this embodiment, the openings (13a) to (13e) of the respective resistance plates (ll
&) to (lie) are communicated with each other at the central portion, and the acoustic resistance is
low. Almost without, the sound wave is passed as it is, while on the other hand, the resistance
plate (61 !!) due to the aperture difference of the openings (13m) to (13e) in the direction 4 to 5
on the periphery. Also in # 7t), since the acoustic resistance is increased by the increase in the
number of polymerized 4 (11 m) to (lle) and the extension of the sound wave passage, the sound
wave becomes spherical wave-like radiation after passing through the present example device il
+. Also, at this time, the vibration applied to the respective resistance plates (lla) to (lie) K sound
pressure acids of the device of the present example (1) due to the vibration of the other member
surface is absorbed and damped by the damping body a 又 は or (17 '). The present invention is
not only applied to a so-called transmission-type acoustic lens group TIL in which a resistive
plate is disposed in the back and forth direction with respect to a speaker as shown in the
example shown in the figure. The present invention can be applied to all acoustic lens devices in
which resistance plates such as acoustic lens devices are provided side by side at a
predetermined interval.
As described above, according to the present invention, in the acoustic lens device pressure
formed by polymerizing a plurality of resistance plates at a predetermined interval, a damping
body made of a visco-elastic material is interposed on the free tin ridge portion side between the
respective resistance plates. Each resistance plate is in a coupled state, and the different vibration
modes generated by each resistance plate are equalized and absorbed as an internal loss, and
each resistance plate is quickly damped and the resonance is not generated due to resonance.
The directional frequency characteristics are also significantly improved (7), and the brakes are
merely interposed between the respective resistance plates, so that the assembly is extremely
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