close

Вход

Забыли?

вход по аккаунту

?

JPH0322799

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH0322799
[0001]
The invention relates to a loudspeaker. 2. Description of the Related Art In recent years, as audio
products have become smaller and more compact, portable stereos have come to be widely seen.
At the same time as these downsizing and downsizing, reduction of power consumption is also in
progress. Speakers that convert electrical signal energy into acoustic energy are widely used as
part of such audio products. In general, the speaker is provided with a voice coil motor having a
magnetic circuit provided inside and a coil which linearly moves by obtaining a magnetic field
from a permanent magnet constituting the magnetic circuit, and the coil is connected to a
diaphragm to generate sound waves. It is generated. It is known that the above-mentioned
speaker is also downsized and downsized. However, in consideration of reduction of power
consumption, it is preferable to use a permanent magnet with a large magnetic force or to reduce
the leakage flux of the magnetic circuit. The goal is to improve the characteristics of the voice
coil motor. As described above, conventionally, in order to reduce the power consumption of the
speaker, only the characteristic of the voice coil motor has been improved. An object of the
present invention is to provide a speaker whose power consumption is reduced by means
different from the conventional one. [Summary of the Invention] (Means for Solving the
Problems) In order to achieve the above object, in the present invention, a speaker having a voice
coil motor and emitting a sound wave by the movement of the movable part of the voice coil
motor In the above, the coil mass of the voice coil motor and the mass of the movable body
excluding this coil were approximately equal. (Operation) Generally, the force F0 generated in the
coil is expressed by the following equation. F, = G-Q-I-P--------G; magnetic flux density (T) Q: coil
length (m) I; current flowing through coil (A) P; coil utilization efficiency (in magnetic field Also,
the power consumption W0 of the coil is expressed by the following equation. W, = R и и и и и и и и и и и
и и R coil resistance [?] Also, coil resistance R is expressed by the following equation. k-?R "S ииииии
? k; coil material resistivity [Omega и m] S; coil cross-sectional area [Bo] Here, the coil mass, the
13-05-2019
1
following equation between the coil length and coil cross-sectional area There is a relation of Q-S
= "L = e-V q ... 0 ... e) Coil volume efficiency V; coil volume [1], the following equation can be
derived from the equations {circle over (1)}, {circle over (2)} = Upper!
LS eV и и и и и и ? the Vol.2, ? more results following equation is obtained as the acceleration
obtained when driving the load mass M [one] in coils of m (kg) anE ? / S3] Is expressed by the
following equation. Therefore, when the power consumption is constant, the maximum
acceleration is obtained when the coil mass is equal to the load mass, and the driven body
(movable body) can be driven faster than when any other mass ratio is used. Therefore, when
generating the same volume, if the mass of the coil and the mass of the movable body excluding
this coil are equalized, the power consumption is minimized. The present invention will be
described below based on the drawings. FIG. 1 is an external view showing a speaker of the
present invention. As shown in the figure, the speaker 1 comprises a high sound reproduction
speaker 3 and a low sound reproduction speaker 4 in a frame 2. Here, the high-frequency
reproduction spy force or low-frequency reproduction speaker 4 has a cross-sectional shape as
shown in FIG. That is, the diaphragm 5 made of cone paper or the like is supported by the frame
2 via the edge 6 having a semicircular cross section. A truncated conical cylindrical body 7 is
fixed to the back surface of the diaphragm 5, a voice coil bobbin 8 is formed on the small
diameter end side of the cylindrical body 7, and a voice coil 9 is wound on the outer periphery so
as to be orthogonal to the paper surface. It has been turned. In the vicinity of the voice coil 9,
yokes 11a and 11b connected by permanent magnets 10 are arranged. In such a configuration,
the magnetic flux flowing in the yokes lla and llb generated from the permanent magnet 10 acts
on the voice coil 9 inserted in the magnetic gap portion, and an electrical signal ( The diaphragm
5 can be moved in the direction of the arrow by Lorentz force generated by the current signal).
At this time, since the diaphragm 5 radiates the vibration as a sound wave, it is possible to
change the speed and the magnitude of the vibration by changing the electric signal, and to
generate an arbitrary sound. Here, the mass of the voice coil 9 is equal to the sum of the mass of
the diaphragm 5, the cylinder 7, the mass of the voice coil bobbin 8 and the mass of about half of
the mass of the edge 6. By making the mass of the voice coil 9 equal to the mass of the movable
body driven by the voice coil 9 as described above, it is possible to generate the same volume
with less power consumption than in the prior art. The principle is explained below. In general,
the force F0 generated in the coil is expressed by the following equation. F0 = G?Q ииииииииииииииииии G,
magnetic flux density (T) Also, the power consumption W0 of the coil is expressed by the
following equation.
Coil resistance [?] Also, the coil resistance R is expressed by the following formula. coil material
resistivity [? и m] S; coil cross section (rf) where coil mass, coil length and coil cross section
There is a relationship. Q-S =-"= eq и и и и и и и и и и V; kQ I2-Wc = s '"'" "k-Party 2-Engineering 2e-------.
? The acceleration a (? / S2) obtained when the load mass of (kg) is driven by a coil of m (kg) is
13-05-2019
2
expressed by the following equation. Therefore, when the power consumption is constant, the
maximum acceleration is obtained when the coil mass is equal to the load mass, and the required
volume can be generated with less power consumption than in any other mass ratio. Also, in the
case of a speaker used around a specific frequency, the mass increase M ^ by the fluid (the
acoustic propagation medium around the speaker) as shown in the following equation was added
to the movable body at the frequency of interest By correcting the value to be equal to the mass
of the voice coil 9, the acceleration occurring under the same power consumption can be
maximized at the most frequent frequency of each speaker, and the total consumption Power
consumption can be further reduced. Of course, the sound propagation medium mentioned here
may be considered other than air and water depending on the use environment of the speaker.
MA = 'L (Zr) (6) ? where Zr = pc?d2 ((1-"") + j "") X X x = = (d dC? ^; J1; S; ?; C: added mass by
fluid Bessel function (first order) Struve function (first order) vibrational angular frequency
[seven] sound speed (m / s) [effect of the invention] As described above, the present invention
According to, a speaker is provided that can obtain the same volume while consuming minimal
power.
[0002]
Brief description of the drawings
[0003]
1 and 2 are an external view and a sectional view showing a speaker of the present invention.
DESCRIPTION OF SYMBOLS 1 ... Speaker 2 ... Frame 3 ... High-pitched sound reproduction
speaker 4 ... Bass-sound reproduction speaker 5 ... Diaphragm 6 ... Edge 7 ... Frustum-shaped
cylinder body 8 ... Voice Coil bobbin 9 ... voice coil lO ... permanent magnet lla, 1 lb ... yoke
13-05-2019
3
Документ
Категория
Без категории
Просмотров
0
Размер файла
11 Кб
Теги
jph0322799
1/--страниц
Пожаловаться на содержимое документа