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JPS54183341

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DESCRIPTION JPS54183341
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway perspective view showing a
conventional acoustic lens known to date. FIG. 2 is an enlarged perspective view showing an
example of the internal structure of the metal stoma body applied to the present invention. FIG. 3
is an external perspective view showing an embodiment of the present invention. FIG. 4 is an
explanatory view showing a method of manufacturing the acoustic lens of this embodiment. 5
and 6 are an external perspective view of an essential part showing another embodiment of the
present invention and a plan view of a state where it is attached to a speaker unit. 1 and 8 are an
external perspective view of an essential part showing still another embodiment of the present
invention and a cross-sectional view in a state of being attached to a speaker unit. 9 and 10 show
the frequency directivity characteristic and the third harmonic distortion characteristic when the
acoustic lens is attached to and removed from the speaker unit in the embodiment shown in FIG.
It is each obtained characteristic diagram. 10.10A, IOB, 10C, IOD, IOE: porous metal body 11, 21,
31 acoustic lens 12, speaker unit 15A, 15B. 25.35 · · · · · · · Notch sloped surface.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an acoustic lens
attached to a curved surface or the like of a speaker, and more particularly to a threedimensional irregular mesh-like gold porous body having communicating pores. It relates to an
acoustic lens. Conventionally, in order to improve the directional characteristics of sound in a
speaker system or the like, particularly the directional characteristics of high frequency range, an
acoustic lens 2 is attached to the front of the speaker unit 1 as shown in FIG. Techniques have
been proposed and put into practice that radiate the acoustic output through the passage. In FIG.
1, the speaker unit 1 is an acoustic output driver))? , Y, z 24 ′ ̶ / the so-called tweeter for
high-range reproduction, which is composed of unit 3 and unit yot horn 4. The acoustic lens 2 is
formed by arranging a large number of punching metals 7 having respective openings 6 whose
valley diameters are increased according to the partial direction in a cylindrical frame 5 with
juxtaposed gaps, A seven runge portion 8 provided at an end of the frame 5 is joined and fixed to
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a seven yot horn 4 of the speaker unit 1. However, in the conventional acoustic lens 2 using the
punching metal 7 as described above, the openings 6 having different diameters are provided in
each punching metal T, and each punching metal 1 is separately attached to the frame 5 one by
one. As a result, the number of component parts and the number of manufacturing steps are not
only large, but also the so-called piling phenomenon is easily generated in the valley punching
metal 7 due to the sound pressure of the sound output, which is sufficient in manufacturing,
price and performance. It is difficult to obtain a practical product. Therefore, in view of the
problems of the prior art as described above, the present invention provides an arbitrary acoustic
characteristic, and an acoustic (2) sound having a simple structure without causing a so-called
fluttering phenomenon by a force. It is intended to provide a lens. Hereinafter, the present
invention will be described in detail with reference to the drawings showing an embodiment. The
acoustic lens according to the present invention comprises a three-dimensional irregular mesh
metal porous body 10 having communicating pores 9a as shown in FIG. 2 as an example of the
internal structure, and the metal porous body 10 has a central portion thickness tl And the
peripheral thickness t. The acoustic lens is shaped into an arbitrary acoustic lens shape in order
to obtain the desired acoustic transmission characteristics. The metal porous body 10 is made,
for example, by forming a foamed resin type, permeating the foamed resin type by the plating
liquid gold capillary phenomenon, depositing a metal by a plating method, and then burning off
the foamed resin. Manufactured.
The skeleton 9b of the metal porous body 10 shown in FIG. 2 is formed by the metal portion
deposited by the above-mentioned plating method, and the portion of the foamed resin burned
out becomes the communicating pores 9a. (3) And FIG. 3 is an external appearance perspective
view showing one embodiment of the present invention, in which 11 is an acoustic lens
consisting of the first and second metal porous body blocks 10A and 10B, and 12 is The acoustic
lens 11 is attached to the front surface of the speaker unit, and 13 and 14 are a frame and a
diaphragm of the speaker unit 12. The first and second metal porous body blocks 10AIIOB are
rectangular solid metal porous body blocks 10C as shown in FIG. 4 in a plane having an arbitrary
inclination angle θ (indicated by a dot and dash line in the figure). Each inclined surface 15A
obtained by cutting with. The metal porous body is shaped to have a shape of 15 Bk. Each of the
porous metal flocks 10A and 10B is attached to the front surface of the speaker unit 12 so that
its thickness gradually decreases in the radial direction toward the central portion in the radial
direction, and constitutes the acoustic filter 11. In the embodiment as described above, it is
possible to improve the directivity characteristics of the acoustic output with respect to the
reverse (4) □□, l direction of the front surface of the speaker unit 12 attached to each metal
porous body block 10At 10111 configured as the acoustic lens 11 gold, In addition, the focal
point of the acoustic lens 11 can be arbitrarily set by adjusting the inclination angle θ of the
inclined surfaces 15A and 15B of the metal porous body blocks 10A and 10B. In addition, each
of the metal porous body blocks 10At10E can be produced by extremely simple processing of
cutting the rectangular parallelepiped metal porous body block 10C obliquely as described
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above. 5 and 6 are an external perspective view of an essential part of another embodiment of
the present invention and a plan view of a state in which the speaker unit 14 is mounted. In this
embodiment, as shown in FIG. 5, the acoustic lens 21 is formed into a rectangular parallelepiped
shape having a substantially semi-cylindrical notch inclined surface 25 at the central portion and
is made of a metal-free porous body 10D. Mounted on the front diameter. The acoustic lens 21 as
described above can be formed by cutting out the above-mentioned notched inclined surface 25
in a rectangular solid metal porous block, but when producing a metal porous body by the above
method, a foamed resin type is used. If the shape is foam-formed into the shape shown in FIG. 5
in advance in (5), the same shape can be easily and repeatedly manufactured.
The acoustic lens 31 in the embodiment shown in FIGS. 7 and 8 to be described next can also be
manufactured easily and easily by the above method. Each of the embodiments as described
above is an acoustic lens 11.21 for improving the directivity characteristics of the acoustic
output in the radial direction of the speaker unit 12. However, the external perspective view of
the main part and the speaker unit 12 are shown in FIGS. In an embodiment as shown in a crosssectional view attached to the front of the speaker, the directivity characteristic of the sound
output can be improved over the 360u direction. That is, in this embodiment, as shown in FIG. 7,
the acoustic lens 31 is made of a metal porous body 10E shaped into a disk shape having a notch
inclined surface 35 of a parabola surface shape at the center, mounting plate 16 is attached to
the front of the short horn 17 of the speaker unit 12. In FIG. 8, reference numeral 18 denotes an
opening formed in the mounting plate 16. (6) − / ′ The acoustic lens 31 has a thickness t of the
peripheral portion more than a thickness t □ of the central portion of the disk-shaped metal
porous body 10E. Can be enlarged over the entire circumference, so that directivity
characteristics can be improved over 360.degree. With the radiation axis direction of the sound
output from the speaker unit 12 as the central axis. In each of the above-described embodiments,
since the metal porous body is shaped into an arbitrary acoustic lens shape to constitute the
acoustic lens, the number of component parts is extremely small as 1 or 2. It is also possible to
simply and repeatedly manufacture things, which reduces the number of manufacturing steps
and can provide an acoustic lens with extremely low cost. In addition, the acoustic passing
characteristics of the acoustic lens can be set arbitrarily, and since the metal porous body
constituting the acoustic lens has an integral structure, so-called squeezing phenomenon due to
the acoustic output does not occur, and the performance is also improved. An extremely good
acoustic lens can be provided. In addition, if the above-mentioned acoustic lens is constituted
using the metal porous body which consists of metal materials, such as nickel N top, it is not
necessary to give surface treatment (7), and it can attain cost reduction further. Here, for the
embodiment shown in FIG. 3 described above, each obtained by measuring the frequency
directivity characteristic and the third harmonic distortion characteristic when the acoustic lens
is attached to the front of the speaker unit and when it is removed. A characteristic diagram is
shown in FIGS. 9 and 10. As apparent from FIG. 9, according to the embodiment of the present
invention, it is possible to improve the frequency directivity in the directions of 30 ° and 60 °
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with respect to the panfull surface. In FIG. 9, the thick line indicates the characteristic line when
the acoustic lens is removed, the thin line indicates the characteristic line when the acoustic lens
is removed, the characteristic line in the 30 ° direction is indicated by a solid line, and the
characteristic line in the 60 ° direction is indicated by an alternate long and short dash line.
There is.
Furthermore, as is clear from FIG. 10, according to the embodiment of the present invention, the
third harmonic distortion level is reduced by 6 to 10 bB (2 to 5 KHz (close)) within the operating
frequency band. And third harmonic distortion can also be reduced. In FIG. 10, the thick line
indicates the case where the acoustic lens is attached, the thin line indicates the case where the
acoustic lens is removed, the solid line indicates the characteristic line of the original acoustic
output level, and the dashed line indicates the characteristic of the third harmonic (8) sumi level
The line is shown. As apparent from the description of each of the above-described embodiments,
according to the present invention, the directivity characteristics and the third distortion
characteristics can be improved, and moreover, the manufacturing is simple and the cost can be
reduced. It is possible to provide an acoustic lens with very good sound transmission
characteristics without occurrence of so-called piling phenomenon due to output. The present
invention is not limited to the above-described embodiments, but includes many modifications
such as shaping of a porous metal body into a convex lens shape.
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