close

Вход

Забыли?

вход по аккаунту

?

JP3023579

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 JP3023579
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer used for energy conversion between electrical energy and acoustic
energy, and more particularly to a ribbon type electroacoustic transducer having a ribbon-shaped
diaphragm. It is.
[0002]
Heretofore, this type of ribbon type electroacoustic transducer has a very high frequency without
loss associated with the transmission of force because the diaphragm itself generates a driving
force, taking the speaker as an example. It is possible to reproduce up to that area, which will
extend to the ultrasound band.
[0003]
FIG. 3 is a perspective view showing an example of a conventional ribbon type electroacoustic
transducer.
The magnetic circuit M includes the magnets 4 and 4, the magnetic poles 5A and 5B, and the
yoke 6. A gap G having a predetermined interval is formed between the magnetic poles 5A and
5B. The ribbon diaphragm 2 is disposed in the gap G, is made of a thin metal plate having good
electrical conductivity such as aluminum and beryllium and having a low density, and the
13-05-2019
1
magnetic poles 5A, 5B and so on in the gap G. It is supported at an appropriate distance so as not
to touch.
[0004]
Since the ribbon diaphragm 2 has a very low electrical impedance, it needs to be converted to an
appropriate impedance when connected to an amplifier (not shown). The matching transformer 1
is for converting into an appropriate impedance, and is connected to the diaphragm 2 by the lead
wires 3 and 3.
[0005]
However, the above-described conventional ribbon-type electroacoustic transducer has a small
number of lead wires 3 from the matching transformer 1 to the ribbon diaphragm 2 and the
ribbon diaphragm 2 itself. Inductance is a major factor in the deterioration of the high frequency
characteristics of the speaker. For this reason, although the diaphragm 2 itself generates driving
force and has excellent characteristics without loss associated with transmission of force, in fact,
the conversion efficiency may decrease as the frequency increases. It was unavoidable.
[0006]
In order to solve this problem, as shown in FIG. 4, the lead wires 2 and 2 each other, the ribbon
diaphragm 2 and the lead wires so as to cancel the inductance of the lead wires 3 and 3 and the
ribbon diaphragm 2 itself. Alternatively, it has been proposed to form a folded structure in which
the entire lead plate (hereinafter simply referred to as a lead wire) 3a is parallel. With this
structure, the reciprocation current can cancel the generated magnetic flux to lower the
inductance. However, in order to effectively cancel the magnetic flux, this structure requires the
lead wire 3a on the back surface of the ribbon diaphragm 2 to be as close as possible to the
ribbon diaphragm 2 and thus hinders the operation of the ribbon diaphragm 2. I have a problem.
[0007]
The object of the present invention is to provide a good conversion efficiency up to a very high
frequency band, and also to prevent the operation of the ribbon diaphragm even in the middle
13-05-2019
2
and low frequency bands without causing any disturbance due to braking or reflection. It is an
object of the present invention to provide a ribbon type electroacoustic transducer which realizes
high conversion efficiency over a band.
[0008]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the invention
according to claim 1 comprises a ribbon-shaped diaphragm disposed in a gap formed in a
magnetic circuit, and the diaphragm And a conductive plate disposed in proximity to the
conductive plate, wherein the conductive plate comprises the conductive plate that cancels the
magnetic flux generated by the current flowing in the opposite direction to the vibrating plate
and the conductive plate. It is characterized in that it is arranged to surround the plate.
[0009]
According to a second aspect of the present invention, in the ribbon type electroacoustic
transducer according to the first aspect, the conductive plate is disposed on substantially the
same plane as the diaphragm.
[0010]
According to a third aspect of the present invention, in the ribbon type electroacoustic
transducer according to the first aspect, the conductive plate is supported on one end side of the
diaphragm, and the other end side of the diaphragm and the conductive plate An input signal is
connected between a part of the conductive plate and the conductive plate.
[0011]
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present invention will be
described in more detail below with reference to the drawings and the like.
FIG. 1 is a perspective view showing an embodiment of a ribbon type electroacoustic transducer
according to the present invention.
The same reference numerals are given to parts that perform the same functions as those of the
above-described conventional example, and redundant description will be omitted as appropriate.
13-05-2019
3
In this embodiment, the yoke 6 is formed in a U-shaped cross section, and the magnets 4 and 4
are disposed inside the arms on both sides.
The magnetic poles 5A and 5B are disposed in the gap G on the inner side of the magnets 4 and
4, and slopes are formed so that the gap G side is narrowed. The ribbon diaphragm 2 is disposed
between the gaps G. The upper surfaces of the yoke 6, the magnets 4, 4 and the magnetic poles
5A, 5B are substantially the same plane, and the conductive plate 7 is disposed on the upper side
thereof.
[0012]
The conductive plate 7 is disposed so as to surround the ribbon diaphragm 2. The conductive
plate 7 is a good conductor and is disposed substantially in the same plane as the ribbon
diaphragm 2. In addition, a slight gap is provided between the conductive plate 7 and the ribbon
diaphragm 2 so that the two do not make electrical contact. That is, when the front surface or the
horn of the magnetic circuit M is used, the conductive plate 7 is disposed between the magnetic
circuit M and the horn so as to be insulated from both. The ribbon diaphragm 2 has one end
electrically connected to the conductive plate 7 via the support point 8 and the other end
between the support point 9 and the part 7a of the conductive plate 7 on the other end side. , Is
configured to feed the signal input.
[0013]
Since the ribbon type electroacoustic transducer of this embodiment is configured as described
above, as shown by the arrow in FIG. 1, the current I1 flowing in the ribbon diaphragm 2 and the
conductive plate surrounding it The currents I2 and I3 flowing in 7 are opposite to each other,
and the magnetic flux generated by the current can be cancelled. Moreover, since the conductive
plate 7 is disposed so as to surround the ribbon diaphragm 2 at a close distance, the cancellation
of the magnetic flux is effectively performed, and the reduction effect of the inductance is large.
Therefore, the conversion efficiency in the high frequency band is The effect of preventing the
decline is large.
[0014]
13-05-2019
4
Further, since the conductive plate 7 does not block the front and rear of the ribbon diaphragm 2
at all, the operation of the ribbon diaphragm 2 is not adversely affected, and the characteristic in
the low frequency band is obtained by damping due to air resistance. There is no deterioration or
disturbance in the characteristics in the middle frequency band due to reflection. Of course, since
there is no distortion and deterioration of transient characteristics caused by these phenomena,
extremely excellent sound quality can be obtained over the entire band.
[0015]
The support points (feed points) 9 and 10 are used after being converted to an appropriate
impedance using the matching transformer 1 because the electrical impedance between them is
extremely low. At this time, in order to sufficiently enhance the improvement effect of the high
frequency band, it is preferable to shorten the lead wire 3 of the transformer 1 as much as
possible and keep the forward and return paths in close contact to keep the inductance of the
lead wire 3 low.
[0016]
FIG. 2 is a diagram showing the characteristics of the ribbon type electroacoustic transducer
according to this embodiment in comparison with the prior art. Curve A represents the present
embodiment, curve B represents the conventional example in FIG. 3, and curve C represents the
characteristics of frequency-relative sensitivity to which the conventional example in FIG. 4 is
applied. Curve B shows that the improvement of the high frequency band is not performed. The
characteristic of the high frequency band is improved due to the placement of the lead wire 3 on
the back surface of the ribbon diaphragm 2 in the curve C, but disturbances that appear to be
caused by reflection and braking appear in the middle and low frequency bands, It can be seen
that the characteristics are degraded. On the other hand, it can be seen that curve A exhibits
better conversion efficiency up to a higher frequency band than curve B. Further, as compared
with the curve C, the operation of the ribbon diaphragm 2 in the middle and low frequency bands
is not impaired by braking or reflection.
[0017]
13-05-2019
5
Without being limited to the embodiment described above, various modifications and changes
are possible, which are also within the scope of the present invention. For example, although the
explanation has been made by taking the speaker as an example, the same can be applied to a
microphone.
[0018]
As described in detail above, according to the present invention, good conversion efficiency can
be exhibited up to a very high frequency band. In addition, even in the middle and low frequency
bands, high conversion efficiency is realized over the entire band without causing the operation
of the ribbon diaphragm due to braking or reflection.
[0019]
According to the third aspect, the conductive plate is supported on one end side of the
diaphragm, and the input signal is connected between the other end side of the diaphragm and a
part of the conductive plate. It becomes possible to assemble in advance. That is, in the
conventional ribbon type electroacoustic transducer, since the diaphragm is fixed directly in the
magnetic circuit by screwing or soldering, its repair is extremely difficult at the time of failure
such as burnout due to excessive input. . According to the present invention, as described above,
since it is possible to assemble in advance, there is an effect that the method of assembly
replacement can cope extremely easily even at the time of failure, and the performance after
repair becomes stable.
[0020]
Brief description of the drawings
[0021]
1 is a perspective view showing an embodiment of a ribbon type electroacoustic transducer
according to the present invention.
[0022]
2 is a diagram showing the characteristics of the ribbon-type electro-acoustic transducer
according to the present embodiment in comparison with a conventional example.
13-05-2019
6
[0023]
3 is a perspective view showing the positional relationship of the matching transformer, the
ribbon diaphragm, and the lead wires connecting them in the conventional ribbon type
electroacoustic transducer.
[0024]
4 is a circuit diagram showing a method of reducing the inductance of the lead wire or ribbon
vibrator of the conventional ribbon-type electro-acoustic transducer.
[0025]
Explanation of sign
[0026]
DESCRIPTION OF SYMBOLS 1 Transformer 2 Ribbon diaphragm 3 Lead wire M Magnetic circuit
4 Magnet 5A, 5B Magnetic pole 6 Yoke 7 Conductive plate 8, 9 Contact
13-05-2019
7
Документ
Категория
Без категории
Просмотров
0
Размер файла
15 Кб
Теги
jp3023579
1/--страниц
Пожаловаться на содержимое документа