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JPS55130299

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DESCRIPTION JPS55130299
Description 1, title of the invention
スピーカ
Detailed Description of the Invention The present invention relates to a loudspeaker having a flat
diaphragm. The split resonance frequency of a circular plate is given by radius a1 thickness t,
Young's modulus 11 density ρ, Poisson's ratio 、, in the case of peripheral freedom, in the same
way in the second division in the second division. The primary resonance frequency of the lowtemperature speaker of 11i / ρ = OBX10 ′ ′ (g ′% 1ec2, a = 11 m, t = 5 rtrm) using an
example of a conventional natural fiber is 307 H 2 and is a secondary resonance frequency n 13
19 H 2. In fact, there is a reduction of about 30 to 40% by attaching the edge and the damper.
Further, in the disk, as is apparent from the equation (1), a material having a large t and a large V
要求 is required, but there is no material satisfying this. Recently, a material having a large
thickness t and a large “/ p” has been developed because the density が such as GFRP /% nick
is small, and according to these, −second and second order resonance filter number '1 *
Although f2 can be raised, there are few merits to flatten due to the complexity of the structure
and the problem of price. For this reason, despite the fact that the flat loudspeaker has
particularly excellent phase-frequency characteristics as compared to the co-EndPage: single
loudspeaker, conventionally, the shape of the diaphragm is irregularly utilized to use divided
vibration. And the ones that drive almost the entire surface of the diaphragm so that split
vibration is difficult to occur. Also in these cases, the former has a narrow band, and a large
number of non-axisymmetric modes are generated. In the latter, the magnetic circuit is
complicated and becomes only a speaker for high-pitched sound, and is only used in part at
present. The present invention is intended to obtain a speaker having a flat sound pressure
characteristic as well as a phase custom made over a wide band without the above-mentioned
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disadvantages of the conventional one, and to manufacture a speaker of this kind. It is an object
of the present invention to prevent a reduction in the strength of the voice coil which may occur.
In the present invention, for the above purpose, as in the embodiment shown in FIG. 1, for
example, the ring-shaped flat plate (1) is used as a diaphragm and a voice coil (2) f is attached
near the node of its split resonance. Is driven by the magnetic circuit (3), and the strength is
reduced due to the increase in diameter of the voice coil (2) after being fitted and bonded to the
voice coil (2). This is intended to be prevented by the reinforcing ring (2a) bonded to (1). (2b) is a
bobbin part which comprises a voice coil (2), (2C) is a coil part which comprises a voice coil (2).
In order to increase the strength of the voice coil (2), even if the thickness of the bobbin portion
(2b) is increased, the father is hard to deform, and the bobbin portion (2b) is formed of a material
of high strength. However, this is not preferable because the weight of the bobbin portion (2b) or
the weight of the voice coil (2) increases. As apparent from FIG. 1, if the voice coil (2) is provided
with a reinforcing ring (left), the strength of the voice coil (2) can be increased without increasing
the weight of the voice coil (2). Since the ring-shaped flat diaphragm shown in FIG. 1 drives the
nodes of the primary axis symmetric split resonance, it exhibits a substantially flat sound
pressure-frequency characteristic in the piston region up to the secondary split resonance
frequency. Then, if the axisymmetric resonance frequency of the ring-shaped flat diaphragm is
Vp = 5.5 × jD ′ ′, Y2 // 2, thickness 5 end, outer diameter 22 m, and the inner diameter is 4
釧 12 cm, − in the case of order vibration The material, thickness, and outer diameter are about
20-lower than 1068H2 in the case of the same disk, but as shown in Table 1, with secondary
division vibration, obtain different high same wave number in inner diameter Can. Therefore, the
flat loudspeaker according to the present invention has a ring-shaped flat diaphragm with an
outer diameter of 22 cm and an inner diameter of 12 cm [Table 1]. Can be reproduced up to
about three times the band, conespeaker can also be a wide band considering the fall by the edge
and damper, the material of V 、, t to the diaphragm, For example, sufficient performance can be
obtained using paper. Moreover, as shown by the solid line (A) in the case of the speaker of FIG.
1 and the dotted line (B) in the case of the cone type speaker in FIGS. In the cone-shaped speaker,
since the sound source is deeper than the cabinet surface, there is no dip that occurs in the
piston area due to the disturbance of the sound field, and it is flat. Although the embodiment
shown in the first case is shown for the bass attached to the cabinet (5) together with the flatplate type sbi-ca high-pitched speaker (4), this speaker system uses a cone-shaped speaker for
the bass As compared with the case, the bass and high temperature sound source positions are
almost the same, so the phase custom order is flat and the whole becomes thin. FIG. 4 shows
another embodiment of the present invention, in which a high-tone speaker (4) is incorporated
on the inner diameter side of the ring-shaped flat plate diaphragm (1) of the present invention to
form a coaxial speaker. According to this practical example, not only the sound source gathers in
one place, and the localization of the sound is improved, but also the phase delay between the
bass speakers (1), (2), (3) and the treble speaker (4) Can be eliminated.
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It is also possible to eliminate dips in the piston area that have occurred with conventional
coaxial speakers. EndPage: 2 or more, according to the present invention, a flat plate type
speaker having a wide reproduction band equal to or more than a cone type speaker, and flat
sound pressure and phase-frequency characteristics in a piston region. As well as being obtained,
even if the voice coil has a large diameter, the strength can be increased without much weight.
4. Brief description of the drawings. FIG. 1 is a cross-sectional view showing one embodiment of
the present invention, FIG. 2 and FIG. 3 are phase and sound pressure-frequency characteristics
of flat and cone speakers according to the present invention. FIG. 4 is a cross-sectional view
showing another embodiment of the present invention. (1) ... ring-shaped flat diaphragm, (2) ...
voice coil, (2a)-reinforcement ring, (2b)-1-bobbin part, (2c)-coil part, (3) ... Magnetic circuit, (4) ...
Loudspeaker, (5) ... Cabinet. In the drawings, the same reference numerals indicate the same or
corresponding parts. Agent Shino Shino-固 1 −-6 Fu Cel 鼾 EndPage: 3 4 4 I 212 b 568-EndPage:
4
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