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JPS4996712

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DESCRIPTION JPS4996712
1 ? Names of inventions 1-n-f, J-ME-Onkyo Co., Ltd. internal name (02'7) representative of
Onkyo Co., Ltd. ? Takeshi Takeshi 5 ? Japanese Patent Office Open Patent Publication ? JP
49-967120 published Tsukisho 49. (1974) 9.12 Examination Request (All 5 Pages) Specification
L Name of the Invention-Each of a plurality of split horns formed by arranging a plurality of walls
on the main shaft of the horn in the name of h. Horn speaker which equalized the constant and
horn length.
1- Loudspeaker 2 'Patent registration * In the inside of the horn of the horn, a bulging portion
with a continuously changing thickness along the main axis of the throat of the horn and the
open surface is installed. F.
3. Detailed description of the invention The hearing of the playback sound in the room is largely
influenced by the diffusion of the sound wave from the speaker, particularly, in particular.
Loudspeakers with a wide directivity are required at high frequencies. Conventionally, horn tie t
░ C ? beakers are often used as high-tone and mid-tone speakers, or horn speakers are radiated
as sound waves or plane waves ? from the opening surface of phoning, so directivity or
broadness <not ?It was a fault. . In addition, when trying to reproduce to the low frequency with
the horn speaker, it is necessary to make the horn longer and there is a drawback that the horn
becomes large. In order to eliminate these drawbacks, various methods have been taken
conventionally, for example, a rutile horn made by arranging similar horns such that the opening
surface forms a part of a spherical surface, or a horn Expand the side in a fan-like shape and
squeeze the upper and lower walls vertically in the main axis part so that the passage in this part
is suddenly narrowed, the sound pressure in this part is high, the medium density is large, and
the phase velocity of the sound wave is They were S-fast quickly and fanned out from the
opening of the horn to be a sectoral horn that radiates in an expanding manner, a material that
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scatters sound waves, or an acoustic lens attached. "But with multi-cellular horns there is a
significant improvement in directivity, but there is a drawback that the cost is high and the horns
become bulky. The sectional horn is relatively inexpensive and has a drawback that its shape is
large to reproduce the effective area without difficulty, and the acoustic lens etc. has the
drawback that it takes a location EndPage: 1 in addition to the price increase. As described above,
in the conventional horn speaker described above, directivity, low frequency characteristics, price
and the like can not be combined. Therefore, except for these drawbacks, the present invention
has wide directivity in the high region by a structure combining horns with different axial path
lengths of the horns, and relatively shortens the total length of the horn and also lowers it. It is in
providing the horn speaker which C improved the characteristic of the area. The present
invention will be described with reference to FIG. 1. As shown in FIG. 1, the three split horns 1, 2
having the same horn length and opening constant by the partition wall 4 symmetrically with
respect to the central axis as shown in FIG. The split horn 1 is provided with bulging parts 3.3 on
the bulkheads 4 and 4 and the axis of the horn is taken a line, and the split horns 2 and 2 in
which the axis is continuously curved to increase the path length Make the split horns 2, 2
longer than the effective path length or split horn 1 of the sound wave passing through each
horn. The sound wave entering from the horn throat 5 is divided into split horn 12 split horn 2
and transmitted inside the horn and emitted from the aperture face, but the split horn 2 is longer
than the split horn 1 in path length or longer The propagation time is long and the apparent
propagation speed is slower than the split horn 1. .
Accordingly, the apparent propagation velocity is different depending on the position of the
aperture plane, and the sound wave is refracted in the direction of lower velocity. The refractive
index at this time is expressed by equation (1). ??????????????????
??????? In the equation, ░ is the refractive index, co is the velocity of the sound wave of
the split horn 1, C is the speed of the sound wave of the split horn 2,-JO is the effective path
length of the split horn 1, and l is the efficiency of the split horn 2. It is a road length. According
to the equation (1), since the sound wave is refracted at the aperture plane with a refractive
index n and in the slow direction, the sound wave is spread from the aperture plane and emitted,
and the directivity can be widely taken. Also, the equation of refraction due to the path length
difference is expressed by equation (2). (? L21) z2 + 2 / z (z1) y '= 0 ... (2)-In this formula, n is the
refractive index, 2 is the length of the central axis of the split horn 1, t, '), T is the pseudo focal
length of the curved wave emitted from the aperture plane, y is the distance between the' central
axis of the split horn 1 and the central axis of the split horn 2 'at the aperture plane. If equation
(1) and equation (2) are substituted 1??t + q ?positively substitute x = e ??, 1 = ? / + (to +
/) ? + p ? ? ? ? == (3) By determining the pseudo focal length of e, e can be determined by
the value of y. Next, the effect of the present invention in which the bite surface of the horn is
straight and flat will be described. Generally, when the horn is cut short for the purpose of
miniaturizing the horn speaker, as shown in FIG. 2, the impedance characteristic is uneven in the
low band, and the sound quality has five bad ? defects. In the horn of the present invention,
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since the split horn has a longer length than the split horn 1, the impedance characteristic of the
split horn 2 (FIG. 2-22) and the in-dance characteristic of the split horn 1 (FIG. 2-21) 2) move
with respect to the frequency axis, and the unevenness of the characteristics of the split horn 1
and the characteristics of the split horns are totally canceled out to obtain smooth characteristics
as a whole (FIG. 2-2 r) A small, low-frequency horn speaker with low reproduction frequency is
obtained. Next, when the relationship between the number of horn divisions and directivity and
impedance characteristics is described, the angle of refraction, refractive index, and ha? Since L
? ? / CO 8 ? is obtained, CO 6 ? = to / no is obtained from the equation (1). Therefore, the
cosine (cps) of the angle of refraction ? is determined by the ratio of lo to e, and the smaller the
to / l, ie, the larger the number l, the larger the angle of refraction in the split horn 2 and a wider
directivity. If the number of divisions is small, a valley occurs in the curve of directivity
characteristics and fingers. In order to use it, it is necessary to bring the peak (convex) portion of
the characteristic of the split horn 2 (or the reverse) to the valley (concave) portion of the
characteristic of the split horn 1, so t and to The EndPage: 2 refraction angle ? is limited
because it must be properly calculated. ,.
Let's consider the horn divided into smaller and smaller ones. Fig. 3 shows that the inside of the
horn is divided into seven divided horns, and the effective length of each divided horn 31, 32, 32,
32, 333.34, s4, and the path length is / 81 + / 82 + '88' 184, 1, To split horn 3 и 1 and split horn
32. Therefore, the angle of refraction ?31 is cos ?g, = 181 / e 8 ░ 2 divided horn 31 and the
angle of refraction ? 82 divided by divided horn 33 is ░ = t cos e 112 111 / (sa 9 divided horn
31 and divided ho The direction and arrow indicated by the arrow are thick and clear. The wave
front of the sound wave is an envelope curve centered on a pseudo focal point -F connecting the
arrow q point and end, so the larger the number of divided horns, the closer to the wave front
smooth curved surface of the sound wave. The impedance characteristics of the horn speaker are
different from those of the divided horn '32, and the characteristics of the divided ho / 32 are
similar to those of the divided ho 733, Since the characteristics of the split horn 33 are shifted
with respect to the characteristics of the split horn 34, the four characteristics are totally
knocked off each other and become smoother than that in FIG. It can be impossible. As described
above, a large number of split horns are required, and along with that, a partition wall is needed,
and the cost becomes somewhat high. However, it is possible to obtain satisfactory directivity
and frequency characteristics. Next, examples of the present invention will be described. FIG. 4 is
a diagram in which the inside of the horn is divided into three, and divided horns 41. The bulging
portion 43 is provided on the wall 44 divided into -42 "and L, and the path length of the split
horn 42 is longer than the path length of the split horn 41. FIG. 6 shows the measured values of
the directional characteristics of the horn speaker, wherein 62 is a directional characteristic
diagram of the conventional horn speaker without a partition, and 61 is a normal speaker
characteristic having the structure of FIG. The directivity is significantly improved as apparent
when comparing 61 and -62. FIG. 7 shows measured values of the frequency ░ characteristic. 72
is the characteristic of the conventional horn speaker which is not divided, 71 is the
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characteristic of the horn speaker of FIG. 4, and the two are compared (if it is compared, the peak
of -1 of the curve or 71 of 71 compared to-72-frequency) Shifting to the lower side of the-is
showing up. FIG. 5 shows a cylindrical horn speaker, in which the horn is divided into two
concentric shafts 11 and 51.52 by a partition 54 provided with a bulging portion 53, and the
effective path length of the divided horn 52 is longer than that of the divided horn 51. It has
become. .
The sound waves divided into the split horns 51 and 52 from the throat part are refracted and
scattered due to the difference in apparent velocity between the cylindrical horns 51 and 52 at
the aperture surface, and the sound waves are emitted as spherical waves. Ru. As described
above, the horn speaker according to the present invention can be made compact because the
directivity can be clearly increased and the low frequency reproduction limit frequency can be
lowered, and the speaker can be easily mounted on the speaker box etc. It has the advantage of
taking relatively little space. In addition, if the effective path length is made shorter as the
distance from the central axis is reduced, it is possible to produce a horn speaker with very high
directivity.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a principle view of the present invention, FIG.
2 is a horns radiation state diagram, FIG. 4 is a partially cutaway perspective view of the present
invention horn, and FIG. 5 is a portion of a cylindrical horn speaker Fig. 6 is a perspective view of
the horn speaker, Fig. 6 is a directivity characteristic curve of the horn speaker, and Fig. 71 is a
frequency characteristic of the loudspeaker. EndPage: 3 31 31 ?End of the process light 71 f
End Page: 46, Inventors of inventions other than the above (1) и Inventor inventor address TV set
I seedling Y hanging trade Y back number%, No. Onkyo Co., Ltd. Procedure correction
replacement C) / hand indication ? ?> ov> 1 = r 1 2 ? ? ?; ? ? ? ? ? ? ? ? ? ? и 1Name Onkyo ? Inc. ( 027) Representative confession investment five generations Onchiyo иии Inc.
name full name patent attorney Sashin ░ (? part (? lda 3) S ? Masato Hitoshi's solar radiation
inter-day work date ? subject B Chang, Contents of 3 m and 7 stops-each '' 11 'each 11 Hirata
411' (7 и /) specification page 4 1 ? ? 1 ? ? ? ? ? ? ic ic 1 1 l ? ?? ... 1 of the
characteristics Toru 1 и EndPage: ?
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