close

Вход

Забыли?

вход по аккаунту

?

JPH0227898

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 JPH0227898
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrodynamic electroacoustic exchanger such as a speaker, a microphone, and an earphone,
and characterized in that a voice coil is fixed and a field magnet is characterized. Is movable, and
the weight of the movable body can be reduced. As a result, the response speed can be improved
to increase the efficiency of converting the vibration into sound or current, and bass sound can
be easily generated. It is possible to expect a long-life product by avoiding the drag, simplify the
structure, and enable mass production at low cost. It is an efficient electro-acoustic exchanger.
[Technical background and problems thereof] Electrodynamic electroacoustic exchanger 1 For
example, when a voice coil is movably disposed in a magnetic field and a voice current flows, the
voice coil vibrates as the current changes. It is a thing. In this case, a speaker that reproduces a
sound wave by moving a vibrating body by a coil is called a dynamic speaker, and a speaker that
emits a sound wave by directly connecting a coil to a cone-like paper is called a dynamic cone
speaker, Microphones, such as dynamic microphones, are dynamic horns and loudspeakers that
have a small vibrating body with a voice coil and a horn (in other words, a trumpet) attached to
the front to efficiently emit sound waves.? In the same structure as the speaker. Conversely,
when the vibrator is moved upon receiving a sound wave, a voice coil attached to it vibrates in a
magnetic field to generate an electric current. Since all of these electrodynamic electroacoustic
exchangers have the same structure, the loudspeaker will be described below. Many conventional
dynamic cone speakers 1 are configured as shown in FIG. That is, a permanent magnet 4
composed of a cylindrical ferrite magnet on a yoke plate 3 provided with a center ball (central
magnetic pole) 2. Similarly, a cylindrical upper yoke plate 5 is disposed, 5 is fixed by an adhesive
or the like to form a field portion 6 to constitute a fixed side. The field section 6 shown here is
called an external magnet type, but it may be an internal magnet type using a yoke and
incorporating a columnar permanent magnet and a center ball at the center of the inside of the
03-05-2019
1
yoke. good. A cone-shaped frame 7 is connected to the field portion 6, and a peripheral edge of
the cone-shaped vibrating body 9 is joined with an adhesive or the like to the peripheral edge of
the frame 7 together with a gasket (arrowhead). There is.
At a central portion of the vibrating body 9, a coil bobbin 11 formed of paper, thin plastic or the
like on which a cylindrical voice coil 10 is wound at the lower portion is coupled. The
intermediate portion of the coil bobbin 11 holds the voice coil 10 at the center between magnetic
poles and is supported by a damper 12 for applying appropriate damping (damping) to vibration,
and the voice coil 10 is disposed in the magnetic field gap 6 of the field portion 6. It is supposed
to be positioned correctly. Further, a dust cap 14 such as a dustproof cloth is attached to the
upper surface of the central portion of the vibrating body 9 so that dust in the air does not enter
the annular magnetic gap 13. According to such a conventional speaker l, since the voice coil 10
vibrates by dragging the lead wire, the lead wire may be broken or the lead wire may be
detached from the solder depending on long-term use, resulting in breakage. There is a fear and
there is a drawback that the life is shortened. Further, the lead wire (not shown) of the voice coil
10 is drawn out from the top through the magnetic gap 13 from its both terminals, led to the
vibrating body 9 (or may be the frame 7) and soldered at that position. Therefore, by using the
voice coil 10 whose thickness is limited in the radial direction in order to pass both terminals of
the lead wire of the voice coil 10 in the magnetic gap 13, the magnetic gap 13 in the magnetic
gap 13 by the thickness of the lead wire is used. The magnetic flux density could not be
increased, resulting in inefficiency. ? In order to pass both terminals of the lead wire of the voice
coil 10 in the magnetic gap 13 and both terminals of this lead wire must be soldered to the
vibrating body 9 etc., the mass productivity is not good and expensive It had become. ? Also, if
the vibrating body 9 is formed of a thin film plastic of recent years, when the terminal of the lead
wire is soldered to this, the heat at that time makes the hole clear and the defect rate increases.
Could not be mass-produced inexpensively. Further, since both ends of the lead wire of the voice
coil 10 are passed through the magnetic gap 13, the lead wire is accustomed to sliding contact
with the fixed side at the time of vibration of the voice coil 10 and must be manufactured with
great accuracy. In the past, the defect rate was also very high. Further, in the case of the
conventional speaker 1, since the voice coil 10 vibrates, (1) The specific gravity of the wire
constituting the voice coil 10 (specific gravity of copper is There is a drawback that the load is
large because the weight is about 7), the response speed is slow, and the voice signal can not be
extracted more accurately over a wide range.
In particular it was not enough to take out dynamic bass. {Circle over (2)} In order to eliminate
any of the above-mentioned drawbacks due to the fact that the wire for forming the voice coil 10
is very heavy, ie, the weight of the voice coil 10 is not heavy, In order to prevent the magnetic
flux density in the air gap 13 from being reduced, the wires must be closely wound in closepacked lines (or referred to as aligned winding) so that the wires do not overlap. Since the
03-05-2019
2
winding of the tightly wound voice coil 10 is very expensive and requires a high degree of
accuracy, the defect rate is high, and it has the disadvantage of becoming very expensive. {Circle
over (1)} One of the causes of the above-mentioned {circle over (1)} and {circle over (2)} is that
the resistance value of the voice coil 10 is, for example, 1 in the conventional speaker 1 etc. It is
because it is defined like 8 ? etc. However, manufacturing the voice coil 10 in accordance with
the resistance value is very troublesome and has a drawback that the mass productivity is not
excellent. Further, as described above, since the voice coil 10 must be formed by tightly winding
in one row, a large number of turns of the lead wire can not be formed, and a large vibration
force for vibrating the voice coil 10 is generated. In the case of bass, it was not possible to
accurately output an audio signal. Also, especially when trying to put out the bass precisely, it
becomes very accurate. It was not possible to form a speaker or the like capable of producing a
low-pitched sound with high accuracy. In addition, the big vibrational force T for vibrating the
voice coil 10 is. T = t?It: number of turns of wire winding of lead ? == current, conventionally,
since the number of turns of wire winding of lead can not be made a large value for the above
reason, the above-mentioned large vibration Not only the power can not be obtained, but also the
value of the current I is increased, and there is a drawback that the speaker 1 becomes
inefficient. Further, according to the above speaker l, the field section (magnetic circuit) 6 has to
use a large and heavy permanent magnet 4 as is apparent from FIG. In addition, there is a
drawback that it becomes very expensive because a large permanent magnet has to be used. In
addition, since the permanent magnet 4 must be exposed and mounted because the large
permanent magnet 4 is used as described above, a considerable amount of the magnetic flux of
the permanent magnet 4 leaks, that is, such a large leakage flux However, they were used to
adversely affect various types of audio equipment that tend to be mounted at high density.
In addition, since a large permanent magnet 4 must be exposed and mounted as described above,
a considerable amount of the magnetic flux of the permanent magnet 4 leaks, so the speaker 1
becomes inefficient and a large and heavy permanent magnet is used. 1) A large amount of
expensive permanent magnet materials capable of constituting a strong magnetic force has to be
used, which promotes the drawback of becoming a large and heavy speaker which is also
expensive. SUMMARY OF THE INVENTION The object of the present invention is to completely
change the concept of the conventional electrodynamic electroacoustic exchanger, and to move
the field magnet without moving the voice coil. It is an object of the present invention to provide
a highly reliable electrodynamic electroacoustic exchanger that has a long life and is free from
breakage due to lead wire breakage due to lead wire vibration due to the voice coil dragging. In
addition, the lead wire can be prevented from passing through the magnetic gap 13, and the
troublesome step of soldering both lead wires to a vibrator or the like can be omitted, and the
mass productivity can be made excellent and inexpensive. Was made to the task. In the subject of
the present invention, the voice coil is not moved so that the lead wire does not come in contact
with the fixed side, and a magnet material having a specific gravity smaller than that of the lead
as a field magnet (for example, specific gravity 4) By making it move, the weight of the vibrator
03-05-2019
3
can be reduced, the response speed can be increased, and the audio signal can be extracted more
accurately over a wide range. In particular, it is an object of the present invention to make it
possible to configure inexpensively what can extract dynamic bass in particular. That is, since the
field magnet is made to move, it is possible to prevent the field magnet from becoming a large
load and to generate a strong magnetic force and to use a magnet material that can generate
such a strong magnetic force. However, it is an object of the present invention to make it possible
to construct the field magnet at low cost by making the field magnet small and light in weight. In
addition, by making the voice coil not to move, it is possible to adopt a glass winding which does
not require the closely wound winding method of closely winding in one row so that very
troublesome wires do not overlap. In this way, it is an object of the present invention to make
manufacturing of a single winding extremely easy, reduce the defect rate, and enable the voice
coil to be mass-produced inexpensively and easily. Of course, according to the present invention,
the voice coil of the conventional speaker may be used as it is, and the voice coil can be
configured to have a sufficient space to accommodate the multi-turn wound voice coil. It is not
necessary to form a close winding in one row, and by using a voice coil in which a large number
of turns of a lead wire are formed, it is possible to generate a large vibration force for vibrating
the field magnet. In this case as well, it is an object of the present invention to make it possible to
take out an accurate audio signal.
By doing this, large vibrational force TT = t-1t for vibrating the field magnet: number of turns of
wire winding I: formed so that the number of turns of wire winding t becomes a large value in the
current By making it possible to obtain a large vibrational force T and to reduce the value of the
current 1 as well, it is possible to obtain an electrodynamic electroacoustic exchanger such as an
efficient speaker. Was made to the task. Furthermore. By simplifying the magnetic circuit
configuration. By making the leakage flux of the field magnet extremely small, the external
equipment is not adversely affected by the leakage flux of the field magnet, and the magnetic
circuit can be made small, so that the weight is small and the speaker is small in size. MH is
designed to be inexpensive and easy to configure. [Problem to be achieved by the invention of
the present invention] The problem of the present invention is to provide a cylindrical voice coil
fixed in a cylindrical magnetic gap of a magnetic circuit, and to provide the voice coil via the
magnetic coil in the radial direction with the voice coil. A field formed by a cylindrical unipolar
radial anisotropy anisotropic neodymium-boron-iron-based sintered magnet in which inner and
outer surfaces are magnetized to different poles so as to be movable in the magnetic gap in the
axial direction. This is achieved by providing a magnet and providing directly or at intervals a
vibrating member that interlocks or abuts by axial vibrational movement of the field magnet.
[Embodiment of the Invention] [First Embodiment of the Invention] FIG. 1 is an exploded
perspective view of a dynamic cone speaker 16 of the present invention with a part cut away,
and FIG. 2 is a longitudinal sectional view of the same. is there. The first embodiment of the
present invention will be described below with reference to FIGS. 1 and 2. A dynamic cone
speaker 16 according to a first embodiment of the present invention is formed by molding the
03-05-2019
4
magnetic body 1, for example, a plastic powder-containing magnetic body. Center ball (central
magnetic pole) 17. By integrally forming the yoke plate 18 and the frame 19. A stator 20 which
is a field portion is formed. The center ball 17 is formed integrally with the bottom central
portion 18a of the cup-shaped yoke plate 18 so as to extend upward in a cylindrical shape, and is
integrally formed between the outer periphery 17a and the inner peripheral surface 18b of the
yoke plate 18. A magnetic air gap 30 is formed. Then, a cone-shaped frame 19 is integrally
formed on the upper end portion of the outer periphery 18 c of the cup-shaped yoke plate 18. A
peripheral edge portion of a cone-shaped vibrating body 21 is coupled to an upper end
peripheral portion of the frame 19 by an adhesive or the like together with a gasket (not shown).
The thickness at which the upper end portion is a cone-shaped portion 22a is about 1 mm or less
at the center of the lower end of the vibrating body 21 (this varies depending on the
specifications, size, etc. of the speaker 16; 0) The field magnet 22 is coupled to a cylindrical field
magnet 22 (which may be formed to about 5 mm), and is capable of reciprocating oscillation in
the axial direction in the magnetic gap 30. Is the radiation direction (f !! Direction) By using a
cylindrical magnet made of an anisotropic neodymium-boron-iron-based sintered magnet, it is
possible to easily form one that can sufficiently satisfy the purpose of the present invention. The
anisotropic magnet is a magnet which is spin-orientated 9 and can generally be manufactured by
applying a strong magnetic field before the magnet material is solidified. ???? As a magnet
material for forming the optimum field magnet 22, it is desirable that the magnet whose size is
such that the weight of the field magnet 22 is smaller than the weight of the cylindrical voice coil
23 and that one strong magnetic flux density can be obtained. Therefore, it is desirable that the
field magnet 22 selected and prototyped by the inventor of the present invention be of such a
material that a strong magnetic force can be obtained as a magnet and that an extremely thin
magnet in an extremely radial direction can be easily obtained. Therefore, in this embodiment, a
neodymium-boron / iron-based sintered magnet oriented in the radial direction (radial direction)
is used, and this is formed into a cylindrical shape by compression molding means. The field
magnet 22 is magnetized in a single pole so as to have different poles on the inner and outer
peripheries, since it has radial anisotropy and one magnetization direction is regulated. In this
embodiment, the inner periphery is a single pole with the N pole and the outer periphery a S
pole. The field magnet 22 has an axial length of 7 m for both of the actually produced two types
of speakers. An outer diameter of 20 mm was used, one having a radial thickness of about 1 mm
and a weight of 1 g, and the other having a radial thickness of about 0.5 mm and a weight of 0.5
g. Then, as the voice coil 23 described later, the experiment is performed by substituting the
voice coil 10 shown in FIG. 5 having a weight of 0.5 g and an axial length of 4 mm used in the
conventional speaker 1. The Even when any of these two types of field magnets 22 is used, it is
possible to obtain one that generates an acoustic signal accurately. The middle part of the field
magnet 22 holds the field magnet 22 at the center of the magnetic pole and is supported by a
damper (not shown) for applying appropriate damping (damping) to the fi motion, and the field
magnet 22 is provided in the field part. In the magnetic gap 30 of FIG.
03-05-2019
5
Further, a dust cap 24 such as a dustproof cloth is attached to the upper surface of the central
portion of the vibrator 21 so that dust in the air does not intrude into the magnetic gap 30. A
voice coil 23 formed in a cylindrical shape is fixed to the inner peripheral surface 18b of the
yoke plate 18 by using a bonding agent, and the lead wire 25 of the voice coil 23 is yoked. It is
drawn out from the through hole 26 provided in the lower part of the plate 18 and led to the
external circuit. [Second Embodiment of the Invention] FIG. 3 is an exploded perspective view of
the main part of a dynamic cone speaker 16 ░ according to the present invention, and FIG. 4 is a
longitudinal sectional view thereof. Referring to FIGS. 3 and 4. The second embodiment of the
present invention will be described below. ??? The same reference numerals as in the first
embodiment denote the same parts as those in the first embodiment, and a description thereof
will be omitted. A dash will be put in a corresponding part. A dynamic cone speaker 16
'according to a second embodiment of the present invention is integrally formed with a center
ball 17 ░, a yoke plate 18' and a frame 19 'of a cup-shaped longitudinal section by pressing a
magnetic material such as an iron plate. By doing this, a stator 20 'serving as a field portion is
formed. The center ball 17 'is integrally formed in a cup shape by pressing means so that the
inside becomes a cavity at the center of the bottom surface of the cup-shaped yoke plate 18' in
order to reduce the weight and the cost, It extends. A cylindrical magnetic gap 3 ░ is formed
between the outer periphery of the center ball 17 'and the inner peripheral surface of the yoke
plate 18'. Then, a cone-shaped frame 19 'is integrally formed on the upper end portion of the
outer periphery of the cup-shaped yoke 18 ░. Through holes 27 are formed on the frame 19 ░
by pressing means. Further, a flange 29 having a through hole 28 is formed at the upper end
peripheral portion of the frame 19 ░ in order to connect the peripheral portion of the cone-like
vibrating body 21 ░ with a screw or the like together with a gasket 9 not shown. Incidentally, in
the vibrating body 21 ? in this embodiment, in order to increase the vibration efficiency, the
bellows portion 31 is formed on the way. The configuration of the other parts of the speaker 16
'is the same as that shown in the first embodiment, so the description thereof will be omitted. The
reference numeral 26 ░ indicates a through hole. [Operation of the invention] In the present
invention, the principle of the operation is the same. Therefore, to explain with reference to the
first embodiment, when an alternating current of a magnitude based on an acoustic signal is
supplied to the voice coil 23 in Svica 1. According to Fleming's left-hand rule; generating a force
oscillating back and forth along the axial direction of the magnetic gap 30, the field magnet 22
oscillates back and forth in the magnetic gap 30 along its axial direction.
For this reason, the vibrating body 21 fixed to the field magnet 22 vibrates, and an acoustic
signal sound of an appropriate wavelength and size can be generated. [Effect of the Invention]
Since the present invention is configured as described above, the voice coil is not moved, and the
field magnet is moved. Therefore, the lead wire is cut and the solder is removed by the drag and
vibration. It is possible to obtain a highly reliable and long-lived electrodynamic electroacoustic
03-05-2019
6
exchanger without damage. In addition, since the troublesome step of soldering both lead
terminals to the vibrator or the like can be omitted, there is an effect of being excellent in mass
productivity and inexpensive to manufacture. In addition, since it is not necessary to solder the
terminal of the lead wire to the vibrator, it is possible to mass-produce the vibrator at a low cost
and easily using a suitable material such as a desirable thin film plastic. In addition, the field
magnet can generate a strong magnetic force by being composed of a neodymium-boron-ironbased sintered magnet material which is lighter in weight and stronger in magnetic force than
the voice coil and is made of a sintered material of neodymium-boron-iron system magnetism.
Since the amount of use of the magnet material can be small, the weight of the vibrator can be
reduced, the response speed can be increased, and the voice signal can be extracted more
accurately over a wide range, which is difficult in the related art. In particular, there is an effect
that it is possible to construct inexpensive ones with good efficiency that can take out dynamic
bass. In addition, since the field magnet can be made small and extremely lightweight, the
magnetic circuit can be configured very easily, the magnetic path of the field magnet can be
sufficiently closed, and the leakage flux from the field magnet There is an effect that the external
device of the speaker is not adversely affected. In addition, since the field magnet can form a
magnetic circuit so that only a small amount of leakage flux is generated, the field magnet can be
used even if the neodymium-boron / iron-based sintered magnet, which has a higher cost per
dull, is used as compared to the ferrite magnet. Since the thickness of the magnet is very thin and
the weight is light, the amount of use of the magnet material constituting the field magnet is
small, so that the field magnet can be formed at low cost. In addition, the magnetic circuit
including the field magnet is simple. As a result of being able to be formed in a small size and
light weight, there is an effect that an electrodynamic electroacoustic exchanger such as a
speaker can be formed in a small size and light weight. Furthermore, since there is sufficient
space and the voice coil does not move, it is not necessary to adopt a close-winding method in
which the very troublesome wires are closely wound in a row so as not to overlap. The use of the
glass winding makes the single-winding production extremely easy, and the defect rate can be
reduced, and the voice coil can be mass-produced inexpensively and easily.
Furthermore. Since a field magnet can be formed of a magnet material which can generate a
strong magnetic force even if the thickness is thin (especially, recent technologies make this
possible) and a voice coil wound with many turns can be used, a large number of conducting
wires can be used. A voice coil with a turn winding formed can be used to generate a large
vibrational force for vibrating the field magnet, so that an accurate sound signal can be extracted
even in the case of a bass. There is. That is, a large vibrational force TT for vibrating the field
magnet TT = t и T: number of turns of wire winding r: 'I1 In the flow, since the number of turns t
of the wire can be made a large value, a large vibrational force T Since the value of the current I
can be reduced, it is possible to obtain an electrodynamic electroacoustic exchanger such as an
efficient speaker. Although the embodiment of the present invention has mainly described the
speaker, the present invention is naturally applicable to an electrodynamic electroacoustic
03-05-2019
7
exchanger such as a microphone having a common structural principle. In the above
embodiment, the electrodynamic electroacoustic exchanger having a structure in which the
vibrator and the field magnet are directly coupled and interlocked is described as one
representative example, but the present invention is not limited to this, and the vibrator and the
field magnet Without direct connection. It goes without saying that the invention is naturally
applicable to an electrodynamic electroacoustic exchanger arranged at intervals.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an exploded perspective view of a dynamic cone speaker according to a first
embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the dynamic
cone speaker according to the second embodiment of the present invention. FIG. 4 is an exploded
perspective view of the main part of the dynamic cone speaker, FIG. 4 is a longitudinal sectional
view of the same, and FIG. 5 is a longitudinal sectional view of a conventional dynamic cone
speaker.
[Explanation of the code] Dynamic cone speaker. Center ball (central magnetic pole). и Center ball,
4 и и и permanent magnet и upper yoke plate, 6 и и и и field part. ?????? -Gasket (arrow), 9 ...
Vibrator-Voice coil. и и Coil bobbin, 12 и и и Damper 13 и и и magnetic air gap. ??????????
??? ????????????????????????????? ???????????
?????? 17a ? ? ? periphery 18.18 "? ? ? Yoke plate. 18a: bottom surface portion,
18b: inner circumferential surface. 18c outer periphery 19. 19 'frame. 20.20 и и и Stators. 21.21
"... ... an inspiring body. 22: Field magnet. 22a ... cone-shaped part. ?????????????
??? ????????????? 25 иии Lead wire. 26.27.28 ... through hole. 29 и и Flange, 30 ...
magnetic gap. 7 Figure 2 Figure I 6 No Figure 4 Figure 3 S
03-05-2019
8
Документ
Категория
Без категории
Просмотров
0
Размер файла
22 Кб
Теги
jph0227898
1/--страниц
Пожаловаться на содержимое документа