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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a diff user
according to the present invention, FIG. 2 is a perspective view showing a similar support frame,
and FIG. 3 is a book with a horn type speaker support frame and a diff user It is a perspective
view of a device. 1 is a diff user, 2 is a surface in contact with the opening surface of the horn
speaker, 3 is a sound emitting surface, 4 is a recess, 5 is a support frame, 6 is an upper term, 7,
1a is a central hole, 8 is a lower ring, 9 is a lower ring A support pillar, 10 is a horn type speaker.
Fig. 1 Fig. 2 Fig. 3-43-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a diffuser for
improving the directivity of a horn loudspeaker. Horn-type speakers are generally more acidfiltered because their directivity is sharper although their performance is higher than that of
cone-type speakers. In order to solve this problem, the directivity has been improved by an
acoustic lens in which thin plates are arranged in parallel and a diffuser using a punching plate.
In the present invention, the use of a foamable synthetic resin having open cells, in particular, is
intended to improve the sameness of one finger. It is known, for example, in Japanese Utility
Model Registration No. 30788, to arrange a porous material having open cells at the throat of a
horn to form a phase equalizer. However, it has not been known yet that porous materials
comprising open cells are used as a diffuser. Furthermore, it can be attached very easily to the
curved surface of a horn type speaker, and depending on the purpose of use, it may replace the
porous material having open cells with one of various colors or replace it with one having various
diffusion performances. It can be easily removed and removed at the time of deterioration of the
characteristics due to rubbing etc. so that the case can be used. The present invention will be
described in detail with reference to FIG. 71 to FIG. 3 below. A diffuser 11 is made of an open-cell
foam synthetic resin and a foamable sponge (neoprene), and has a surface t 2 + in contact with
the opening surface of the horn speaker and a sound emitting surface (3). The radial shape of the
recess having a radial recess t41 from the surface (2) in contact with the opening surface of the
speaker toward the sound emitting surface (3) is preferably, for example, an exponential type.
Further, as another example, it is possible to make the peripheral part of the opening of the horn
into one having bubbles with a relatively low density of formation and to make the center part
into one having 12+ large bubbles, thereby omitting the recess (4). That is, it is possible to form
an echo resistance that can give a large air resistance as it approaches the periphery of the
Sekiguchi of the horn, and to select its shape as appropriate. The f 51 shown in FIG. 2 is formed
by a support frame so as to have a surface area as small as possible so as not to prevent the
sound wave emitted from the horn. Ie at the top! Select the diameter of the central hole +71 in
the lower region slightly smaller than the outer diameter of the diffuser (1), and select the outer
diameter approximately the same as the outer diameter of the diffuser 1) in summer-8) Is formed
in substantially the same manner as the upper region (6) in the lower region, and the inner
circumference of the lower Ift 81 is laterally routed in the upper and lower regions with the
support columns (9) supporting the upper and lower regions having the central hole (7a). Screws
are provided, and screwed to the male screw provided on the outer peripheral upper surface of
the horn type speaker a1 shown in FIG.
Further, the diffuser il + is inserted into the support frame. In the case where the diffuser and the
support frame are separately manufactured in the above-described configuration, it is possible to
fit the support frame into the diffuser or to select these shapes as appropriate. Various
modifications are possible, such as fitting the pivoting means 31 and the like. According to the
present invention, there is a great effect that the performance can be easily changed by changing
the shape of the foamable porous material, and an inexpensive diffuser can be burst. Brief
description of this aspect 71 Fig. Showing a diffuser of the present invention @ a perspective
view showing a support frame similar to a perspective view 1 ° and 21 & Fi of the present
invention, Fig. 3 a present invention of a horn type speaker support frame and a dither 7a It is an
oblique factor. +11 is a diffuser, '2 + i (surface in contact with the opening surface of the horn
speaker, (3) is a sound emitting surface, (41 is a recess, (5J is a support frame, 16+ is an upper S
ring, (7), (7a) is a center A hole, (8) is a lower ring, (9) is a support column, and qG is a horn type
speaker. Practical 1irr and f recording out fiber person Japan Columbia figure company agent
Ikosu (See Fig. 1 Fig. 2 vA-447 □ · 2 q '/ 1 Fig. 1 is 11). Knee · · · 119. ˜ Π) 1 1 1 11 1
Amendment to the Showa month IN '1 day Patent Office President Yukio Miyake (Patent Office
Referee General) 18 □。 7 name for the application of utility model registration number 92564
2 name of the horn device for the speaker 緘 speaker for the speaker ff user 3 relationship with
the person who holds the case utility model registration applicant (+ place, 7-i Akasaka 4 Minatoku, Tokyo) 14th-14th name Tsu name (41b) iil +: Korombi! Representative director, Inc. 'Ok-i Ji
Rui-1 agent East eastern Shinjuku district Nishi Shinjuku, 11' l JS No. 1 new disease · · · 東-:
'03343-3821 representative freeze · patent attorney Atsushi Ito 5, Date of supplementary city
instruction Showa year 116, I, Ii positive to the contents of the detailed explanation of 某 7
correction of the detailed description of 象 @ @ 象 @) 7't. In the title 1 specification, page 2, line
18 "exponential" is corrected as "hyperbolic layer". More than +2)
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