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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an acoustic lens, FIGS. 2
and 3 are explanatory views of the acoustic lens, and FIG. 4 is a cross-sectional view of an
acoustic lens deflection plate of the present invention. 31 is a substrate and 32 is a plastic
material. -55 1 実 52-51623 (2) o 2 ■ o 3 I ¥ 1 o 4) ro 1 56 1
DETAILED DESCRIPTION OF THE INVENTION The invention relates to an acoustic lens
arrangement for improving the directivity of a loudspeaker. Generally speaking, high fidelity tone
reproduction is requested whether the direction of the speaker is '' or broad or the speaker has
some directivity. Especially in the case of a high sound hono speaker (horn tweeter), the aperture
of the diaphragm is used. In contrast, it is difficult to reproduce a sound field that is sufficiently
variable because the wavelength of the reproduction frequency is short or the directivity of the
reproduction frequency is short, and if the affair is narrow or the difference in the listening
position is different. The acoustic lens device 2 shown in FIG. 1 is a conventional device 2 used in
many cases in order to split the directivity of such a high-pitched horno speaker. In the acoustic
lens device, as shown in the figure, the deflection plate 1 inclined with respect to the traveling
direction of the sound wave is disposed in parallel with a constant interval, and a concave notch
is provided in the central portion of the deflection plate 1. is there. When this is attached to the
horn opening face 2 and the horn speaker 4 is driven, the h wave emitted from the horn opening
face 2 is emitted to the atmosphere through the sound path between the deflectors 1. At this
time, since the sound side is longer than the central portion of the acoustic lens device, the sound
wave is emitted in an arc shape with a delay of the phase of the sound wave emitted from the
acoustic lens device or about one side. The finger has a broad spectrum (Fig. 2). Conventionally,
steel @ (for example, JIS CPS-1) or a large amount of material was used as the material of the
deflection plate 1 of such an acoustic lens device, or a thin material was used for 1iJq and the
sound wave was transmitted over the entire surface. Since it is subject to vibration, it is easy to
cause self-consistency, and it has had a negative effect on the field plate itself or resonance 1-]
GvI characteristics, or deterioration of hearing sensitivity. In order to solve the shortcoming of
the defect, the reinforcement plate 3 firmly fixes the deflection plates I to prevent resonance by
using the reinforcement fitting 3 (also increase the mechanical width between them, or in this
structure, the purpose is sufficiently achieved. Things were in need. The present invention will be
described in detail below with reference to an acoustic lens device w formed of a new material
different from the material used in the conventional acoustic lens device, that is, a metal material
having a rectificative property. The deflection plate of this invention is formed by forming a
sintered alloy by forming a sintered alloy after forming (1) forming a gold plate powder (e.g. Zn,
AlCu or other alloy) into a deflection plate shape, and forming this as a base 31 and its porous
Part is impregnated with a plastic monomer (for example, hinyl acetate) and heated, or
simultaneously with the plastic monomer = (for example, a mixed solution of anopic acid and
gtubit); The plastic monomer impregnated in the porous portion of the L rubber 31 is cured.
The deflection plate l obtained in this way is a four person with a good vibration absorbing
property. That is, when a bending stress is applied to the metal substrate 31, plastic material 32
in the whole substrate 31 causes plastic deformation, and the intermolecular friction of the
plastic material 32 and the friction of the shoot at the boundary between the plastic material 32
and the metal substrate 31 Absorbs vibrational energy and causes resonance to be damped
rapidly. Therefore, whether the acoustic lens device of this invention absorbs the vibrational
energy and causes the self-resonance of the conventional example to receive the vibrational
energy even if it is used by the i wave emitted from the horn opening 2 (It is possible to minimize
the adverse effect on the frequency characteristics. Also, since this metal material 'machine tool
1' is not inferior to conventional national materials, and has sufficient mechanical strength, it
retains its shape and does not require reinforcing metal fittings 3 as in the conventional example,
and the number NγL of groups It has the advantage that it can be reduced to 実 用 j etc. For
example, although the invention has been described only for the slit type acoustic lens device
shown in FIG. 1, the same effect can be obtained for a so-called bunched 5 type metal type
acoustic lens device.