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■ Horn ・ Speaker 特 願 Japanese Patent Application No. 46-55350 [Phase] Application No. 46
(1971) published on July 19 April 48-20519 @ Akira 48 (1973) March 14 0 person between
Koshimura Shinobu Koshisaka Osaka Akarino 22 22 Sharp Co., Ltd. in the ward of Naganocho
Ward 長 Applicant Sharp Co., Ltd 22nd 22nd of Nakanoike, Akari-no-ku, Osaka-shi, Osaka A
detailed explanation of the invention attorney patent attorney Aihiko Fukushi The present
invention is a horn whose length is reduced. It relates to the opening. In general, the length and
opening diameter of the horn of the horn speaker are uniquely determined by the cutoff
frequency which sets the expansion coefficient m of the horn. Therefore, when the quad-off
frequency fc is lowered, the horn expansion is coco, π is the circling constant, fc is the cut-off
group e number, and a is the aperture diameter C the smallest when the sound speed conditions
are satisfied. When the frequency fc is lowered, the aperture aO must be thick (it should be. As a
result [111111], if the cutoff frequency fc is lowered, it is inevitable that the length and the
opening diameter of the horn increase. For this reason, conventionally, in the case of a medium
sound horn speaker, the dimensions of the horn length and the opening diameter are reduced at
the expense of the reflection at the horn opening (i.e., down to a possible value where the
reflection is allowed) Was. But for the reflection of sound at the horn opening; inevitably. As
shown in FIG. 3, the 1-frequency characteristic deteriorates, and the peaks and valleys of the
characteristic curve increase. The degree of deterioration of the frequency characteristic curve is
a curve AI according to the degree of contraction of the horn. A、2. A3のI@になる。 The
present invention, like the prior art, is to improve Custom 5 and reduce the horn length without
degrading the various characteristics of the horn speaker. In the present invention, in the horn of
the horn speaker, firstly, an exponential 0 horn having a basic frequency fc 'lower than the cuton frequency afc of the desired horn speaker is formed. That is, the axial cross-sectional area of
Exponel Lucal at this time is S-5-8 oe where S is the area, So is the area of e, e is the base of
natural logarithms, L is the distance on the axis, and m is the expansion coefficient , M-animals
(C,,!, Sound velocity) 1, Table 5 is given. The basic exponential horn opening is cut so that the
frequency of the first peak (peak portion appearing at the lowest frequency side) of the
frequency characteristic curve of the horn is close to the desired horn cutoff frequency fcO. The
size is reduced to configure the shortcut size hoe 71. The first peak of the characteristic curve
changes to a higher frequency as the horn shrinks. That is, the frequency characteristic curve of
the shortcut size hoe 71 is as shown by A in FIG.
(5) The surface of the opening of the chit-side horn 1 [111111] EndPage: The axial distance from
the throat of the 1-cut size horn to the opening. Next, the expansion coefficient is gradually and
continuously thickened from the shortcut size hoe 71 opening according to the distance on the
horn axis (the expansion coefficient is satisfied at the opening end) ao-1 A horn 2 of (m ~nx) X is
provided. As described above, when the short-cut size horn 1 and the horn 2 formed by cutting
the opening of the basic exponential horn are used, the low frequency characteristics are
deteriorated compared to the case where the horn having the desired cutoff frequency fc is
simply used. There is no In addition, a horn speaker without peaks and valleys in characteristics
can be obtained. That is, the cross-sectional area SX of this portion is SSX-8ae (+ nx) X where X is
the axial distance from the shortcut size horn opening to the opening of the horn 2. Since the
expansion coefficient is gradually increased in accordance with the distance on the horn axis in
this manner, the horn is rapidly thickened (and the on-axis distance for obtaining the required
opening area is shortened). Are made continuously and integrally. In the figure, 3 is a yoke, 4 is a
magnet, 5 is a plate, 6 is a diaphragm, and 7 is a voice coil. As described above, the present
invention forms an exponential curve horn with a cutoff frequency lower than the frequency
targeted by the speaker, and sets the horn near the diaphragm of the speaker to a frequency
characteristic of the horn. The shortcut is made so that the first peak frequency of the curve is
near the target cutoff frequency, and the horn expansion coefficient is gradually thickened
according to the distance on the horn axis at this tip (a horn is provided to make the desired cut).
It has the required aperture area for the off frequency. It is intended to obtain a short horn
having no deterioration in low-pass characteristics and no peaks and valleys in the
characteristics. The length from the throat to the open end of the horn D according to the
invention is thus short compared to the horn E which extends from the throat to the open end
with a conventional single spreading factor, as schematically shown in FIG. According to an
embodiment of the present invention, when the target cutoff frequency is 500 H 2 and the
diaphragm cutoff frequency is 350 H 2, the total horn length is 84% of the conventional one.
Further, in the present invention, the custom-made only for the shortcut horn is as shown in FIG.
2A because of reflection at the opening end of the shortcut horn, but since the horn whose
expansion coefficient is gradually increased is provided at the tip, The impedance matching
between the part and the atmosphere is improved, and its characteristics are high in sound
pressure with few peaks and valleys as shown in FIG. 2B.
Furthermore, in the horn of the present invention, the inclination angle of the wall near the
opening end is large, so that the directivity in the high range is superior to that of the
conventional exponential horn having a single expansion coefficient.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a horn speaker
according to an embodiment of the present invention, FIG. 2 is a characteristic curve of the horn
speaker according to the present invention, and FIG. FIG. 4 is a drawing comparing and showing
a horn according to the present invention and a conventional one. 1 is a horn, 2 is a horn% 3 is a
yoke, 4 is a magnet, 6 is a diaphragm, and 7 is a voice coil. [Phase] Citation of Literature Acoustic
Engineering (1st Volume) Translation by Rev. Nishimaki, Rev. 38. 10 第 31 p. 138, published by
Modern Science Co., Ltd. Hi-Fi Speaker Hirashima Nakajima, Akira Nakajima 43.2 20 20, p.
[1111111 EndPage: 2
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