close

Вход

Забыли?

вход по аккаунту

JPH01140898

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 JPH01140898
[0001]
FIELD OF THE INVENTION The present invention relates to a loudspeaker for converting an
electrical signal into an acoustic signal. PRIOR ART A conventional electrodynamic speaker
basically has a structure as shown in FIG. That is, the voice coil 15 is inserted into the magnetic
gap 14 formed by the blow it, 12 and the magnet 13, and the @ moving plate 16 directly
connected to the voice coil 15 is supported by the edge 17 and disposed. . In the speaker of the
above-mentioned structure, when a voice current flows in the voice coil 15, the voice coil 15
moves in the axial direction accordingly, and further the diaphragm 16 directly connected to the
voice coil 5 is opened. It is emitted as Here, the effective voice coil length in the magnetic flux
density B1 magnetic gap 14 in the magnetic gap 14 into which the voice coil 15 is inserted and
the current flowing through the voice coil 15 and the driving force duet) fr + There is a
relationship. f11 = 8-−i (1), that is, the driving force fM is proportional to the magnetic flux
density B1 effective voice length ρ and the current i, and the magnetic flux density B is large or
the effective voice coil length が is If it is long, a large driving force f11 (i.e. sound pressure) can
be obtained with a small current i. Problems to be Solved by the Invention However, in the
conventional structure, it is difficult to cover high magnetic flux density B in a wide space, and it
is also difficult to take a long effective voice coil length イ ン ピ ー ダ ン ス due to impedance etc.
There is a problem that it is difficult to improve the Further, the distortion caused by the
vibration is also caused by the non-uniformity of the magnetic flux in the magnetic gap 4, and it
is difficult to make the value of the magnetic flux density B constant in a wide space, which
causes the distortion. The purpose of the present invention is to solve the above problems and to
provide a speaker having a high sound pressure level, a low distortion, and a simple structure.
Means for Solving the Problems In order to solve the above problems, the loudspeaker of the
present invention forms a magnetic circuit by a coil of a superconducting material, and arranges
a diaphragm parallel to the direction of the magnetic field produced by the magnetic circuit. And
13-05-2019
1
a voice coil is disposed on at least one side of the diaphragm at a right angle to the direction of
the magnetism. By the above configuration, the diaphragm in which the voice coil is disposed on
at least one side is clearly understood from the relationship of the above equation (1) by the
strong magnetic field obtained by the magnetic circuit formed by the coil made of 81 conductive
material. It is possible to vibrate up and down with a large amplitude, to obtain a high voltage
level even with a small audio current, and to keep the magnetic flux density constant over a wide
range to reduce distortion.
EXAMPLES Examples of the present invention will be described below based on the drawings.
FIG. 1 is a schematic front view of the main part of the speaker according to the first embodiment
of the present invention, and FIG. 2 is a schematic plan view of the main part of the speaker. In
FIGS. 1 and 2, coils 2a and 2b using super-ml material are respectively wound around a pair of
opposing left and right core materials 1a and 1b to form a magnetic circuit, and a magnetic gap 3
between the core materials 1a and 1b is formed. The diaphragm 4 is disposed parallel to the
direction of the magnetic field, and both ends thereof are supported by the end portions of the
core members 1a and 1b via the edges 5a and 5b, and a voice coil is caused to flow an audio
current on the upper surface of the diaphragm 4 6 is disposed at right angles to the direction of
the magnetic field. In the above-described W4 speaker, the coils 2a and 2b formed of a
superconducting material are cooled by liquid nitrogen and kept in a superconducting state, and
the coil 2a in that state. When a current is applied to 2b, a strong magnetic field and a magnetic
flux density B are generated between the core materials 1a and 1b. When a voice current flows
through the voice coil 6 disposed on the upper surface of the diaphragm 4 disposed in the
magnetic field, the driving force moves to the diaphragm 4 and vibrates in the vertical direction,
thereby reproducing the sound according to the voice current. Then, by using a superconducting
material for the coils 2a and 2b, a strong magnetic field is formed in a wide space in the magnetic
circuit, and the magnetic flux density B is high and uniform. Is played. FIG. 3 is a schematic front
view of the main part of the speaker according to the second embodiment of the present
invention, and FIG. 4 is a schematic plan view of the main part of the speaker. In FIGS. 3 and 4,
coils 2a and 2b using superconducting materials are respectively wound around a pair of
opposing left and right core members 1a and 1b, and a center pole 7 is disposed between the
core members 1a and 1b to provide magnetism. A circuit is formed, and a diaphragm 4 is
disposed above the center pole 7 in parallel with the direction of the magnetic field, and a voice
coil 8 is disposed on the upper surface of the diaphragm 4 at a right angle to the direction of the
magnetic field. The voice coil 8 is wound so that the driving force generated on the upper
diaphragm 4 is in the same direction between the coil 1a and the center pole 7 and between the
coil 1b and the center pole 7 as shown in FIG. ing. Also in the speaker of the second embodiment
described above, as in the first embodiment, when the coils 2a and 2b are kept in a cold state
with liquid nitrogen 741 L cooled in a superconducting state and current flows, the core material
1a and the center pole 7 are A strong magnetic field and a high, uniform flux density B are
generated between and between the core 1 b and the center pole 7 respectively. In this state, if a
13-05-2019
2
voice current is supplied to the voice coil 8, the driving force is vibrated in the vertical direction
by the diaphragm 4, and a sound with little distortion is reproduced at a high sound pressure
level according to the voice current.
In the above embodiments, the coils 2a and 2b are wound around the core 1a and 1b, but the
same effect can be obtained without using the core. Effects of the Invention As described above,
the speaker of the present invention is simple in structure, and the diaphragm in which the voice
coil is disposed on at least one side is a wide area 7 obtained by magnetic resonance formed of a
coil made of a superconducting material. Can be driven with a high and uniform magnetic flux
density B of a strong magnetic field, and a small sound current can reproduce a sound with low
distortion at a high sound pressure level. 4, 1l fiil description of the drawings FIG. 1 is a
schematic front view of the main part of the speaker according to the first embodiment of the
present invention, FIG. 2 is a schematic plan view of the main part of the speaker, and FIG. The
schematic front view of the principal part in the speaker of 2nd Example, FIG. 4 is a schematic
plan view of the same speaker, FIG. 5 is a schematic sectional drawing of a prior art example. 2a,
2b ... coil, 4 ... diaphragm, 6, 8 ... voice coil, 7 ... center pole. Agent Yoshihiro Morimoto Fig. 1 Fig.
3 · · · Hois coil Fig. 4 Fig. 5
13-05-2019
3
1/--страниц
Пожаловаться на содержимое документа