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JPS5510217

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DESCRIPTION JPS5510217
Description 1, title of the invention
ホーンスピーカ
This invention relates to a horn speaker having a phase equivalent function Y. FIG. 1 shows a
conventional horn loudspeaker with phase equalizer. In FIG. 1, (1) is a phase equalizer, (2a), (2b)
is a throat, (3) is a diaphragm, (3g) is an air gap in front of the diaphragm (3), +41 cover, (5) is
Ring-shaped magnet, (61 is a yoke forming a magnetic circuit, (7) is a throat portion of a horn,
(8) is a horn, (9) is an outlet of the phase equalizer 11) and a throat portion of the horn (8) (7) It
is a sound path for coupling with a computer. In general (-horn speaker (: in order to expand the
frequency band, a phase equalizer (1) as shown in FIG. 1 is used. (2 in the case of a dotted line
(as indicated by alc in FIG. 2), the sound pressure characteristic is provided at frequency C2 near
the upper limit of the reproduction frequency. Deterioration occurs. The cause of the
deterioration of the sound pressure characteristics is the structure of the entire diaphragm or the
edge portion, the material, the type of the diaphragm, the attachment of the diaphragm, etc. (:
The structure of the phase equalizer is also conceivable. And the attachment of the phase
equalizer may also be attributed to the method. Therefore, the structure of the conventional
phase equalizer and the relative positional relationship between the phase equalizer and the
throat part of the horn etc. were carefully reconsidered C, various structural analysis, analysis of
relative positional relationship, results of theoretical C The relationship between the structure
and the relative position where the above deterioration seems to be possible was seen. That is, it
was found that the distance from the diaphragm side end of each throat of the phase equalizer to
a plane perpendicular to the horn central axis in the throat portion C of the horn was different,
and this difference caused the phase equalizer It has been found that the horn throat section (:
the phase of each arriving sound wave is different C through each throat of), and characteristic
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deterioration occurs in the sound wave synthesized at the throat section of the horn. Based on
this theory C2, as a result of test 7 conducted as a structure in which a plurality of open loops for
equalizing EndPage: 2 for phase equalization in front of the diaphragm and independently
extending to the outlet side opening of the horn are obtained. Deterioration of the characteristics
in the range sea! It was resolved. As described above, the present invention aims to remove or
suppress the deterioration of the sound pressure characteristic in the high frequency range in
the horn speaker using the phase equalizer, and more specifically, in front of the vibration plate
(two phases Extending to the outlet side of the plurality of open side horns for equalizing
independently. (: The above objective is to be achieved.
An embodiment of the present invention will be described below with reference to FIGS. 3 to 6.
That is, in FIGS. 3 to 6, (91), (4), (93), (94), (95), (96), (97) are seven partition walls, and they are
cast or single-metal bodies such as aluminum. The horn outlet end face (92c) (93c) (94c) (95c)
(96c) (97c) is formed integrally with the horn outlet side end face (8a) of the horn (81 itself).
There are two on the same plane as). (101 x 102 x 103) (104 x 105 x 106 x 107) are openings
formed between the above-mentioned partition walls, and (lola) (102 a) (1 (Ba) (104 a) (105 a)
(105 a) (106 a) (107 a) are generated by the diaphragm (3). At the entrance of the sound wave,
the length between the adjacent openings is less than C at the wavelength of the upper limit
frequency of the reproduction frequency (hereinafter referred to as λ) at the outermost
periphery C2. (101b) (102b) (103b) (104b) (105b) (106b) (107b) is an outlet for sound waves,
and tlll is an interconnecting portion concentric with the dome shaped diaphragm (3) of each
partition. The radius in the direction perpendicular to the sound axis is less than or equal to 5%.
02) [13+ fit the holding plate holding the diaphragm (3), the holding ring az the light ring El of
the yoke (6), the holding ring α3) the light ring (81) of the horn (8) It is done. The inner
diameter of the sound wave inlet side of the horn (8) is larger than the diameter of the dome
portion of the diaphragm (3). In addition, as shown in the figure, each of the two walls
(91X92X93X94) (...) (96) (97) has an outer surface (91a) (92a) (93a) (94a) (94a) (95a) (96a)
(97a) The horn (8) is formed in a shape that conforms to the inner circumferential surface C, and
the above-mentioned integral! The respective openings (101), (102), (103), (104), (105), (105),
(106), (107) are the sound wave inlets thereof. Independent from the side (101a) (102a) (103a)
(104a) (105a) (106a) (107a) to the sound wave outlet (101b) (102b) (102b) (103b) (104b)
(105b) (106b) (107b) Extend. However, the distance between the inner surface of the horn (8)
and the outer surface of each partition (9ia) (92a) (92a) (93a) (94a) (95a) (96a) (97a) is C
according to the accuracy in working and the accuracy in assembling. Although there may be a
gap of value, in this case as well, it can be said that each of the openings (50 l) to (t 07) is
independent of each other.
Each of the partition walls 91 (92 X 93 X 94 X 95 X 96 X 97) has an outer surface shape and a
thickness in the circumferential direction centering on the sound axis! Each of the openings (lol)
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to (107) has an index of area in a plane perpendicular to the sound axis from the sound wave
inlet side (lola) to (107a) to the sound wave outlet side (lOlb) to (107b) The function is
constructed so as to become gradually larger. That is, as shown in the figure, in each of the
partition walls (91) to (97), the dimension in the direction perpendicular to the sound axis, that
is, in the horn radial direction, gradually increases from the sound inlet side to the sound outlet
side. The circumferential thickness is formed so as to be gradually thinner from the sound wave
inlet side to the sound wave outlet side. Therefore, the side surfaces (91b), (92b), (93b), (94b),
(95b), (96b) and (97b) of the partition walls are inclined in one plane (two in one plane). The
sound pressure characteristics in the embodiments shown in FIGS. 3 to 6C are the actual #i! Of
FIG. As can be seen in the case of b ((2), as shown in comparison C with FIG. 2, C :, almost no
deterioration of the sound pressure in the high range is seen. It is thought that the technical basis
that hardly any deterioration of sound pressure in this high-pitched range can be seen is that
synthesis of sound waves of different phases in the C, horn throat section is not performed as
described above. Also in FIG. 3 to FIG. 6C, at the outlet of the horn (8), the sound waves emitted
from the independent apertures (lOt) to (107) are synthesized in the external space, but Unlike
the case where C is almost completely synthesized in a narrow space such as the C nihon throat
part, the sound wave radiated from each of [101] to (107) spreads from the wide external space
C 2 respectively. The rate at which sound waves with different phases are synthesized is very
small, and it seems that a drop in sound pressure in the high range is not seen. The number 77 of
the apertures is the non-axisymmetric vibration of the diaphragm 13) (the sound pressure
strainen is improved due to the end page: End Page: 3), basically having an odd number of
apertures This distortion Z can be improved. Furthermore, in this embodiment, since the aperture
shape is radially extended in the radial direction, it is not necessary to consider the radial
resonance occurring in the gap on the front surface of the diaphragm (3). C: Disturbance in
characteristics occurs because the distance from any point on the diaphragm (3) to each slate is
dispersed in relation to each throat C: C is more It becomes easy. FIG. 7 is a view showing
another example of the openings (101) to (107). In 611, the mutual connection portion (center C
of 111: the closer the opening width in the circumferential direction is, the closer it is. The
opening width may be the same as shown in FIG.
FIG. 8 shows another embodiment of the integral t partitions (91) to (97) and the openings (101)
to (107)! In the figure which shows, in FIG. 5, each partition (91)-(9) and each opening (101)(107), sound wave exit (lolb)-(i07b) from sound wave entrance (101a)-(107a) C is linear, so that
the sound axis is also linear, but in FIG. 8 (in case of-each partition (91) to (97) has a shape in
which the circumferential direction C is twisted around the center of the joint portion aIIv.
Therefore, each partition wall (91) to (97) each opening (lot) to (lO7) is non-linear from the
sound wave inlet (tota) to (lO7a) and the sound wave outlet (lolb) to (107b) The sound axis is also
non-linear and curved. With this configuration, the propagation distance of the sound wave
becomes longer in the peripheral area than near the central axis of the horn, and the horn
openings (101) to (107) (the same sound pressure of the sound wave in two, the same phase
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surface is apparently spherical It is possible to improve the sound pressure directivity
characteristics by configuring the wave (==). Further, since the length of the sound path inside
the horn is long, the outer dimensions of the horn can be shortened, the weight and size can be
reduced, and the horn material can be saved. FIG. 9 is a view showing another example of each
partition (91) to (97), and in FIG. 4, FIG. 5 and FIG. 8, the horn (8) outlet of each partition (91) to
(97) Although all the end faces (91c) (92c) (93c) (94c) (% c) (96c) (97c) on the side are linear, in
FIG. 9, the end faces (91b) to (9Th) are outside. To make it a curved surface to be gathered C: The
sound pressure characteristics can be further improved. In the above-mentioned Example C,
although each partition (91)-(97) illustrated about what was integrally molded by casting and cut
out from a single metal material, each partition (91)-( 97) Y each independently (: manufactured
and assembled separately by means such as using mutual C 2, adhesive in the Y mutual bonding
part 1 ull)ヲ. Furthermore, in the above embodiments, each partition inside the horn extends in
the radial direction, and as a result, the openings are arranged in parallel in the circumferential
direction, but the present invention is not limited to this shape, as shown in FIG. Each partition!
The same effect can be obtained even if the openings extend in the circumferential direction and
the openings are arranged in the radial direction. In FIG. 1C, each partition (91) has no conical
column, and the other partitions (92) (93) (94) have no conical cylinder. Although FIG. 1 O 2 C
does not show the horn and the diaphragm etc. 1-, the right end of each of the partition walls
(91) to (94) extends to the outlet side opening of the C nihon as in FIG. The left end directly
opposes the diaphragm 13) through the air gap (3t) '1 as in FIG. 3, and the left end surface shape
is a shape C along the surface C2 of the diaphragm on the horn side.
As described above, in the horn speaker according to the present invention, a plurality of open
slots for equalizing the front C bifurcated phase of the diaphragm. The sound pressure frequency
characteristics in the high range of this horn speaker, since y is independently extended to the
horn outlet side opening! It can be significantly improved.
4. Brief description of the drawings. FIG. 1 is a longitudinal sectional view showing a part of a
conventional horn speaker, FIG. 2 is a characteristic diagram showing the relationship between
frequency and sound pressure, and FIG. 3 to FIG. FIG. 3 is a longitudinal sectional view showing
the vicinity of the diaphragm, FIG. 4 is an overall perspective view, FIG. 5 is a perspective view of
a partition, and FIG. 6 is a partition! The rear view seen from the diaphragm side and FIGS. 7 to
10 are other embodiments of the present invention respectively. 7 is a rear view of the partition
seen from the diaphragm side, FIG. 8 is a perspective view of the other partition, and FIG. 9 is a
further perspective view of the entire partition incorporated in the other partition and horn. FIG.
10 is a perspective view showing still another partition wall with a partial cross section EndPage:
4. In the figure, (3) is a diaphragm, (101) (102) (103) (104) (105) (106) (107) is an opening, (8)
is a horn, and (8a) is an outlet side end face of the horn itself , (91), (92), (93), (94), (95), (a), (97)
are partitions, and (91b), (92b), (93b), (94b), (95b), (96b), (97b) are partitions. The side portions
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91c, 92c, 93c, 94c, 95c イ and 97c are end faces on the horn outlet side of the partition walls,
and σB is an interconnecting portion. In the drawings, the same reference numerals denote the
same or equivalent parts Z. Agent Shino Shin-w1 Figure 2 Figure 閤 & LHx) Figure 6 EndPage: 5
Figure 7 Figure 8 Figure 7 fa Figure 8-EndPage: 6
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