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DESCRIPTION JPS62172900

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DESCRIPTION JPS62172900
[0001]
TECHNICAL FIELD The present invention relates to improvement of a speaker, and more
particularly to a speaker in which small amplitude of a vibration source such as a voice coil is
amplified by amplitude amplifying means and transmitted to a diaphragm. 2. Description of the
Related Art In recent years, there has been a demand for downsizing and higher performance of
audio devices, and speaker systems have also been miniaturized, but there is a problem with bass
acid reproduction. The on-axis sound pressure (Pr) and the amplitude (x) of the speaker are
expressed by the following equations. ... (2) where ?. A: density of air, ?: vibration angular
frequency, a: effective radius of diaphragm, r: distance between speaker and microphone, V:
velocity of diaphragm, X: amplitude of diaphragm, A: force coefficient, E: signal Input voltage, RE:
electrical resistance of speaker, Mll: vibration system mass of speaker, Ma: load mass of air, Qo:
sharpness of resonance, fo: lowest resonance frequency, f: frequency. Therefore, the efficiency
decreases as the effective radius of the diaphragm decreases. Still, the amplitude of the
diaphragm is large in the low-frequency acid because it is inversely proportional to the square of
the frequency above f0 according to equation (2). However, if the voice coil winding width is
reduced in order to improve efficiency, the amplitude range of the voice coil becomes narrow,
and a distortion component is generated by the low-frequency acid. Therefore, there is a speaker
using a long voice coil as a method capable of large amplitude, but there is a drawback that the
utilization of the voice coil is deteriorated and the efficiency is lowered. Therefore, in order to
improve efficiency and reduce distortion, it is necessary to amplify a small amplitude of the voice
coil and transmit it to the diaphragm. As a prior art, for example, as disclosed in Japanese Patent
Publication No. 56-131298, there has been one using a fluid pressure transmission device using
a cylinder and a piston. Hereinafter, a conventional speaker as described above will be described
with reference to the drawings. FIG. 2 is a schematic cross-sectional view of a conventional
speaker using an amplitude amplification mechanism by a fluid pressure transmission device. In
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FIG. 2, 1 is a center pole, 2 is a plate, 3 is a magnet, 4 is a voice coil inserted in the gap of the
magnetic circuit formed by the lower end of the center pole 1. Of the cross-sectional area S1
formed in the part, 6 is the piston of the cross-sectional area S2 formed at the lower end of the
diaphragm 9, 7 is the cylinder having the piston 6 on the input side and the piston 6 on the
output side, 8 cylinders The fluid pressure transmission device 7 is composed of 7 and pistons 5
and 6, and 10 is an edge where the inner peripheral end is bonded to the outer peripheral end of
the diaphragm 9 and the outer peripheral end is fixed to a frame (not shown). The operation of
the conventional speaker configured as described above will be described below.
????????? ?????? When a signal current flows through the voice coil 4 in the
magnetic gap formed by the magnet 3, a force is exerted on the voice coil 4 according to
Fleming's left-hand rule to vibrate up and down. At this time, the piston 5 formed in the voice coil
4 also vibrates, and the fluid pressure transmission device 8 amplifies the vibration of the piston
6 by S1 / S2 times that of the piston 5. Therefore, the diaphragm 9 fixed to the piston 6 is also
amplified by S1 / S2 times as much as the displacement of the voice coil 4. Problems to be solved
by the invention However, in the configuration as described above, there is a drawback that the
high frequency range with high frequency is difficult to transmit because the vibration is
transmitted through the fluid (usually air) of the fluid pressure transmission device. It is
unsuitable as a full-range speaker that reproduces from the low range to the high range. There is
also the disadvantage that the efficiency is reduced because air leaks from the gap between the
cylinder and the piston. Furthermore, if the fluid in the cylinder uses oil with a density (?) and
sound velocity (C) higher than air in order to improve high-frequency characteristics, load mass
increases and efficiency decreases. It was not suitable as a speaker having an amplitude
amplification mechanism. SUMMARY OF THE INVENTION In view of the above problems, the
present invention provides a speaker provided with an amplitude amplification mechanism that
reproduces high fidelity with high efficiency from low to high frequencies. Means for Solving the
Problem To achieve this object, the speaker of the present invention comprises a first frame, a
first end, a first diaphragm, and a first air chamber surrounded by a magnetic circuit; A hole
through which air can flow in and out is provided substantially at the center of the magnetic
circuit, and an end of an expandable bellows having a diameter larger than the hole is fixed to the
back of the magnetic circuit and the other end is a second The second air chamber is configured
by being fixed to the diaphragm, and the second diaphragm is fixed to the second frame via the
second edge, and the second frame is between the first frame and the second frame. And an
amplitude amplification mechanism configured to surround the outer periphery while having an
air gap. Operation With this configuration, when the voice coil moves, the volume of the first air
chamber changes, and the air moves from the second air chamber through the hole in the center
of the magnetic circuit to change the volume of the second air chamber (the bellows The second
diaphragm is also moved by corresponding expansion and contraction. At this time, the amount
of movement of the second diaphragm corresponds to the sectional area of the first diaphragm
A4. Assuming that the cross-sectional area of the bellows is A2, the amount of movement of the
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first diaphragm is expanded by A1 / A2 times as much as the amount of movement of the first
diaphragm, and the reproduction of the bass region becomes good.
Moreover, although the vibration of the first diaphragm is transmitted to the second diaphragm
via air, and it may be difficult to transmit the high frequency range with high frequency, the high
frequency range may be directly radiated by the first diaphragm. It is possible to realize a full
range speaker having an amplitude amplification mechanism. Furthermore, the first one. The
second air chamber is constituted by being surrounded by the first diaphragm, the first edge, the
first frame, the bellows, and the second diaphragm, and a conventional amplitude amplification
mechanism using a piston and a cylinder. There is no gap and high degree of sealing, and air can
not leak, so vibration can be transmitted efficiently. Embodiment An embodiment of the present
invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a
loudspeaker according to an embodiment of the present invention. In FIG. 1, 11 is a center pole,
12 is a plate, 13 is a magnet, 14 is a lower end portion of the center pole 11.1. A voice coil
bobbin provided with a voice coil (not shown) inserted in a magnetic gap constituted by a plate 1
magnet 13 at the tip, 15 is a first frame, and 16 is an outer peripheral edge fixed to the first
frame 15 A damper with free flow of air with the inner peripheral end fixed to the voice coil
bobbin 14, 17 is a first diaphragm, 18 is an inner peripheral end fixed to the outer peripheral
end of the first diaphragm 17, and the outer peripheral end is A first edge fixed to the frame 16
of 1, an air hole 19 provided substantially in the middle of the magnetic circuit, an upper end 20
fixed to the back of the center pole 11 larger than the diameter of the air hole 19, and a lower
end 2, an expandable bellows fixed to the diaphragm 21; 22 is a first frame 11: a first edge 18; A
first air chamber surrounded by a first diaphragm 17 and a magnetic circuit, 23 is a second air
chamber surrounded by a bellows 2o, a second diaphragm 21 and a magnetic circuit, 24 is a first
frame 16 And a second frame surrounded by an outer periphery and fixed to the first 7 frame 16
by a connecting rod 26 so that air can freely enter and exit from the slit 27; The second edge 24
is fixed to the outer peripheral end of the diaphragm 21 and the outer peripheral end is fixed to
the second frame 24. The operation of the loudspeaker configured as described above will be
described below. First, when a signal current is allowed to flow through the voice coil inserted in
the magnetic gap, driving force is generated according to Fleming's left-hand rule, the voice coil
bobbin 14 vibrates up and down, and the first diaphragm 17 vibrates to generate sound. . At this
time, since the volume of the first air chamber 22 changes, the volume of the second air chamber
23 connected by the air hole 19 also changes, and the bellows 2 o stretches and vibrates
according to this volume change. The diaphragm 21 vibrates, so that the generated sound wave
(sound wave in phase with the sound wave generated by the first diaphragm) is emitted through
the slit 27 to generate sound.
As described above, according to the present embodiment, the first diaphragm 17 and the second
diaphragm 21 are connected by the fluid pressure transmission device consisting of a piston and
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a cylinder, and the first diaphragm area is set to A1. Assuming that the cross-sectional area of the
bellows 20 is A2, the displacement of the second diaphragm 21 is expanded to A1 / A2 times the
displacement of the first diaphragm 17. In addition, due to the mechanism that transmits
vibration through air, it is difficult for the frequency to be transmitted to high a, and the second
diaphragm 21 does not vibrate in the high range, but the first diaphragm 17 can emit sound.
Therefore, it is possible to improve the drawback that the high range can not be reproduced like
a speaker having an amplitude amplification mechanism by a conventional fluid pressure
transmission device. Furthermore, conventionally, there has been a drawback that the air leaks
from the gap between the piston and the cylinder and the efficiency is deteriorated. However,
according to this embodiment, the first air chamber 22. The second air chamber 23 is a closed
system, and since there is no air leakage, sound can be reproduced efficiently. In the present
embodiment, the first diaphragm 17 is cone-shaped, and the second diaphragm 21 is flat-shaped,
but either can be a cone-shaped flat-plate or any other shape, and can be freely changed.
According to the present invention, the first air chamber surrounded by the first frame and the
first edge, the first diaphragm and the magnetic circuit of the present invention, and the
expandable bellows, the second diaphragm and the magnetic circuit The conventional piston and
cylinder are connected by an amplitude amplification mechanism having a closed system which
is connected to the second air chamber by an air hole and amplified by the ratio of the area of
the first diaphragm and the cross sectional area of the bellows. As in the case of a speaker having
an amplitude amplification mechanism, the air gap from the cylinder and the piston does not
cause air leakage so that highly efficient reproduction is possible. Also, in the case of a speaker
which transmits vibration through a fluid such as air to amplify the amplitude as in the prior art,
high frequency vibration can not be transmitted, so reproduction of the high frequency region is
impossible, but in the present invention, the first vibration is The board can be reproduced to the
high range because it is directly driven by the voice coil, and the low range can be reproduced by
the second diaphragm with amplitude amplification through air, so a single speaker unit can
cover the full range from low to high range An excellent speaker that can be reproduced can be
realized.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a speaker according to an embodiment of the present invention,
and FIG. 2 is a cross-sectional view of a conventional speaker.
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11 ...... center pole, 12 ...... plate, 13 ...... magnet 14 ...... voice coil bobbin 15 ...... first frame, 16 ......
damper, 17 ...... first diaphragm 18 ...... first edge, 19 ...... air hole, 20 ...... Bellows, 21
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Second second air chamber Of the frame 26,. Name of
Agent Attorney Nakao Toshio and 1 other person in charge-1 person 0-le 't2--b L-f-3-mab ? butt
f 4- 1 1 pois gau Il, Ie pi f5 1st IQ RU 4 f 6--? ? ? '-f 9-One empty car bite 20---,-Rose 21-? ?
2 ? ? ? ? ? 22--y) ? 1 Air / Does 23+-1 2nd Re 24-1 tile 2L 7 L-425-1 1 2 24 Elli 26 1
Connecting rod Figure 2
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