close

Вход

Забыли?

вход по аккаунту

?

JPH0217799

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 JPH0217799
[0001]
The present invention relates to an electrodynamic electroacoustic exchanger (electrokinetic
electroacoustic apparatus) such as a speaker, a microphone, and an earphone, and is
characterized in that a coil for generating a vibration force is used. It is fixed, and while the field
magnet moves, the weight of the movable body can be lightened, and as a result, the response
speed is improved and the efficiency of converting the vibration into sound or current is
enhanced. Acoustic signals in the acoustic or bass region can be easily generated, and since the
coil is fixed, it is possible to expect a long-lived one without lead wires, and simplify the structure
and inexpensively mass-produce it. did. It is an efficient electroacoustic 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 with 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 sbi force
Also, a voice coil is used to move a small vibrator, and a horn is placed on the front of the
vibrator to radiate sound waves efficiently, which is called a dynamic horn speaker. Each of these
electrodynamic electroacoustic exchangers has the same structure, and therefore, the speaker
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 the yoke plate 3
provided with the center ball 2). Similarly, a cylindrical upper yoke plate 5 is disposed, and these
are fixed by an adhesive or the like to form a field section (magnetic circuit) 6 to constitute a
fixed side. The field section 6 shown here is a 5 external magnet type, but it is also 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 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
03-05-2019
1
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 made of paper, thin plastic or the like
in which a cylindrical voice coil 10 is wound around the lower portion of the vibrating body 9 is
coupled.
The middle portion of the coil bobbin 11 holds the voice coil 10 at the center between the
magnetic poles and is supported by a damper 12 for damping the vibration appropriately, and
the voice coil 10 is held in the magnetic gap 13 of the field section 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 1, since the voice coil 10
vibrates by dragging the lead wire, depending on long-term use, the lead wire may be cut or the
lead wire may be detached from the solder, resulting in breakage. In addition, 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, (1) The magnetic flux
density in the magnetic gap 13 is increased by the thickness of the lead wire by using the voice
coil 10 whose thickness is limited in order to pass both terminals of the lead wire of the voice
coil 10 in the magnetic gap 13 It could not be done and was inefficient. ? In order to pass both
terminals of the lead wire of the voice coil 10 into the magnetic gap 13 and both terminals of this
lead wire must be soldered to the vibrating body 9 or the like, mass productivity is not good and
expensive It had become. In the case where the vibrating body 9 is formed of a thin film plastic of
the present day, 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. 9 could not be formed, and mass production
could not be done inexpensively. In addition, since both ends of the lead wire of the voice coil 10
pass through the magnetic gap 13, there is a fear that the lead wire contacts the fixed side at the
time of vibration of the voice coil 10, and it must be manufactured with high accuracy. The defect
rate was also very high. Further, in the case of the conventional speaker 1, since the voice coil 10
is vibrated, the wire constituting the voice coil 10 has a large load because its specific gravity
(specific gravity of copper is about 7) is heavy, and the response speed There was a drawback
that it was not possible to extract the audio signal more accurately over a wide range of late ones.
In particular it was not enough to take out dynamic bass. In addition, the magnetic gap 13 is
widened to prevent the weight of the voice coil 10 from becoming heavy so that the drawback of
the above 1 due to the fact that the lead wire for forming the voice coil 10 is very heavy is
eliminated. In order to prevent the magnetic flux density in the air gap 13 from being reduced,
the wires must be closely wound in close-packed lines (or referred to as aligned winding) so that
the wires do not overlap. Since the 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.
03-05-2019
2
(1) One of the causes of the defects and points in the above-mentioned items 1 and 2 is that the
resistance value of the voice coil 10 is determined to be, for example, 7 ? according to the
standard in the conventional speaker 1 or the like. 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 driving force for vibrating the voice coil 10 is generated. In the case of 1 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. The driving force T for vibrating the voice
coil 10 is. T = t-1t: The number of turns of the wire is given by the flow, but conventionally, the
number of winding turns t of the wire can not be made a large value for the above reason, and a
large driving force as described above Not only can not be obtained, but also the value of the
current is increased, and there is a drawback that the speaker 1 becomes inefficient. [Section 51
of the invention] The object of the present invention is to completely change the concept of the
conventional electrodynamic electroacoustic exchanger, and to make the coil lead by keeping the
field magnet stationary without moving the coil. It is an object of the present invention to provide
an electrodynamic electroacoustic exchanger having a long life and a high reliability without the
breakage due to the cutting of the lead wire due to the drag and the vibration due to the
vibration. In particular, in an electrodynamic electroacoustic exchanger configured to achieve
such a subject, the purpose is to miniaturize and obtain a high-performance bass acoustic signal.
It is an object of the present invention to increase the magnetic flux density so that the magnetic
force of a small-sized field magnet can be collected, and as a result, to obtain a high-performance
electrodynamic electroacoustic exchanger. Although there are some common items to achieve
such problems, there are also problems that can be obtained by the items unique to the
embodiment, and these problems will be described below. Another object of the present
invention is to make it possible to efficiently collect the magnetic flux density of the field magnet,
and to achieve a concentrated magnetic flux density of the field magnet in order to achieve this
task. (1) In the present invention, as described below, a pole piece capable of alternately forming
the N pole and the S pole is provided. However, by utilizing this pole piece effectively, a coil for
generating a vibration force can be provided. The task was to store effectively.
That is, the coil storage portion for generating a vibration force is formed of a magnetic body so
that the coil for generating a vibration force can be held, and the coil storage holding portion is
not separated from each other in the axial direction. Further, a magnetic pole piece capable of
forming a different pole is formed, the magnetic flux density of the field magnet is efficiently
collected on the magnetic pole piece, and the current is switched to the vibration force
generating coil provided in the coil storage portion. An N pole or S pole is formed on the pole
piece to generate a large attraction / repulsion force to generate a large oscillating force of the
03-05-2019
3
field magnet to generate an acoustic signal with good oscillation response, that is, an accurate
signal. It is an object of the present invention to make it possible to mass-produce an
electrodynamic electroacoustic exchanger which can be compactly and inexpensively. In
particular, in order to form a coil storage portion for generating a vibration force by a magnetic
body so that the coil can be stored and protected rationally, it is opposite to the face of the pole
piece facing the field magnet via the magnetic gap in the radial direction A coil storage recess for
vibration force generation formed by the magnetic pole piece is formed at the side position, and
the pole piece is made N pole by energizing the vibration force generation coil stored in the
vibration force generation coil storage recess. It is an object of the present invention to make it
possible to form the magnetic pole of the south pole. Also, the lead wire should not be passed
through the magnetic gap between the field magnet and the vibration force generating coil. In
addition, it is possible to eliminate the troublesome process of soldering both lead terminals to
the vibrator etc., and to achieve excellent mass productivity and to be able to manufacture the
electrodynamic electroacoustic exchanger inexpensively. It is Further, in the subject of the
present invention, by making the coil not move, the lead wire does not come in sliding contact
with the fixed side, and the magnet material whose specific gravity is smaller than that of the
conductor forming the coil as a field magnet. By using (for example, one with a specific gravity of
4 to 6) and moving it, the weight of the vibrator is lightened, the response speed is fast, and the
voice signal is more accurate over a wide range. It is an object of the present invention to make it
possible to take out, in particular, to make it possible to construct inexpensively what can take
out dynamic bass. As described above, even if a magnetic material (for example, one having a
specific gravity of 4 to 6) having a specific gravity smaller than that of a conducting wire forming
a coil as a field magnet is used, (1) radial anisotropy which can obtain strong magnetic flux The
object of the present invention can be achieved by using an appropriate magnet material of rare
earth type or neodymium / iron / boron type.
Also, by making the coil not moveable, it is not necessary to adopt a closely wound winding
method (also referred to as alignment winding) in which the wires which are very troublesome to
manufacture are closely wound in a row so as not to overlap. An electrokinetic electroacoustic
exchanger of a certain quality by making it possible to adopt a glass winding to extremely
facilitate the production of a single winding, reduce the defective rate, and enable mass
production of the vibration force generating coil inexpensively and easily. It is an object of the
present invention to make it possible to mass-produce at low cost. Also, for the purpose of
obtaining extremely large vibrational force according to certain specifications, the structure can
be configured to have enough space to accommodate a multi-turn wound coil, and the coils are
closely wound in one row. Even in the case of a bass, a precise bass can be generated by making
it possible to generate a large driving force for vibrating the field magnet by using a coil in which
a large number of turns of conducting wire are formed without forming the coil. It is an object of
the present invention to make it possible to extract an audio signal of By doing this, driving force
TT for vibrating the field magnet = t-1t: number of turns of the lead ? = = by forming the
03-05-2019
4
number of turns of winding t of the lead to a large value. An object is to obtain an electrodynamic
electroacoustic exchanger such as a speaker with high efficiency by making it possible to obtain
a large driving force T and to make the value of the current I small. It was done. Another object
of the present invention is to make it possible to apply a uniform magnetic flux to the oscillating
force generating coil regardless of the position within the movable stroke of the field magnet
constituting the vibrator. An object of the present invention is to make it possible to obtain an
acoustic signal with high performance by always obtaining a vibration force of a magnitude
based on a constant ratio. SUMMARY OF THE INVENTION The object of the present invention is
to provide a cylindrical single-polar field in which inner and outer surfaces are magnetized to
different poles so as to be movable in the axial direction in the cylinder magnetic gap of the
magnetic circuit. A magnet is provided, and a ring-shaped vibration force generating coil is
provided via a magnetic pole piece made of a magnetic material on the fixed side facing the side
surface of the field magnet via a magnetic gap in the radial direction. By energizing the
oscillating force generating coil, a magnetic pole of N pole or S pole is formed on the pole piece,
and it is supported so that the oscillating movement of the field magnet in the axial direction is
possible. This is achieved by providing an electrodynamic electroacoustic exchanger in which a
vibrating body linked or brought into contact by axial vibrational movement is provided directly
or at a distance from the field magnet.
Another problem is that, in the above-mentioned electrodynamic electroacoustic exchanger, the
generation of the vibration force does not separate the magnetic pole pieces consisting of the
above magnetic members in the axial direction and is positioned via the magnetic field gap and
the magnetic gap in the radial direction. This can be achieved by covering and forming the coil
surface sheet. Still another problem is that the above-mentioned magnetic pole piece is formed
on the opposite side to the magnetic pole piece provided on the surface facing the field magnet
via the magnetic gap in the radial direction, and the vibration force generating coil storage
concave portion made of magnetic material And a magnetic pole piece projecting toward the
opposing field magnet via a magnetic gap in the radial direction is formed by the vibration force
generation coil storage recess, and the vibration force generation coil is stored in the vibration
force generation coil storage recess. This is achieved by forming an N pole or an S pole in the
pole piece protruding toward the field magnet through the magnetic gap in the radial direction
by energizing the vibration force generating coil. Another subject is the axial length m of the pole
piece in the electrodynamic electroacoustic exchanger. m = L?X??? = ?a + ?bm> X> ?> ?
a, ? b where L: axial length of field magnet X: length of vibration stroke of field magnet ?: axis
of field magnet Length ?a of the field magnet for lengthening the field magnet excessively to
suppress the fluctuation of the magnetic distribution small by the magnetic flux distribution at
the end of the direction ?: ?: by the magnetic flux distribution at the upper end in the direction
of the field magnet , Length ?b to lengthen the upper end of the field magnet excessively in
order to reduce the fluctuation of the magnetic distribution: The fluctuation of the magnetic
distribution is reduced by the deflection of the magnetic flux distribution at the axial lower end of
03-05-2019
5
the field magnet This is achieved by setting the length of the lower end of the field magnet to an
extra length to hold down. Another problem is that, in the above-described electrodynamic
electroacoustic exchanger, the field magnet is formed of an anisotropic magnet material oriented
in the radial direction, and has a specific gravity lighter than that of the above-described
vibration force generation coil. -Achieved by forming with soto material. Other issues will be
clarified in the following explanation. [Embodiment of the Invention] [First Embodiment of the
Invention] FIG. 1 is an exploded perspective view in which a part of a dynamic cone speaker 15
according to the invention is cut away and omitted, and FIG. 2 is a longitudinal sectional view
thereof. . The first embodiment of the present invention will be described below with reference to
FIGS. 1 and 2. A dynamic loudspeaker 15 according to a first embodiment of the present
invention illustrates an arrangement in which the magnetic circuit 16 can be formed so as to be
very thin in the axial direction, and can therefore be configured to be very flat and lightweight.
ing.
The magnetic circuit 16 configures the stator 20 by fixing the upper end flange 19 a of the cupshaped stator magnetic member 19 formed of a magnetic body to the lower end of the frame 23.
A substantially central portion of the outer periphery 19b of the stator magnetic member 19
constituting the stator 20 is formed so as to project toward the opposing field magnet 22 via an
annular magnetic gap 21 described later, and substantially the above outer periphery 19b is
formed. A ring-shaped coil storage concave portion 19c for generating vibrational force is
formed at the central portion. A wire 18 is formed into a ring shape by winding a suitable
number of turns from the outer peripheral portion to the vibration force generation coil storage
concave portion 19c. By doing this, the vibration force generating coil 18 facing the field magnet
22 through the 1 magnetic gap 21 is entirely covered with a magnetic body (formed by the pole
piece 17 described later). Since it is protected by the magnetic material, the coil 18 can be firmly
stored and held in the four portions 19c. The lead wire 18 a of the vibration force generation coil
18 is led from the outer periphery 19 b of the magnetic member 19 to an external circuit. The
coil 18 may be left as it is, but since it is left bare, a cover such as a lap type formed of an
appropriate member such as plastic is attached to the outer periphery 19 b of the magnetic
member 19 as necessary. Also good. As described above, by forming the ring-shaped vibration
force generation coil storage recess 19c in the outer periphery 19b of the stator magnetic
member 19 so as to be open at the outer periphery, the inner circumferential surface facing the
recess 19c is directed to the magnetic gap 21. A ring-shaped, non-axially separated pole piece 17
is formed so as to face the field magnet 22 with the magnetic gap 21 therebetween. The pole
piece 17 faces the cylindrical field magnet 22 supported so as to reciprocate in the axial
direction in the annular magnetic gap 21 opposed to each other via the magnetic gap 21 in the
radial direction. In order for the field magnet 22 to be able to perform strong and quick
reciprocating oscillation, the field magnet 22 needs to be formed by an optimum magnet material
and an appropriate formation method thereof. Here, as the magnetic material for forming the
optimum field magnet 22, for example, the field magnet 22 to be formed has a magnetic flux
03-05-2019
6
density lighter than the specific gravity of the vibration force generating coil 18 by one strong
magnetic flux, It is desirable that the material be extremely easy to process or form. Therefore,
the field magnet 22 selected and prototyped by the present inventor can obtain a strong
magnetic force as a magnet material, and can easily obtain an extremely thin magnet. Use a resin
(or, of course, a sintered type) magnet of about 6 rare earths or neodymium / boron iron (which
may be formed including other than the above three components) and eject it What was formed
in cylindrical shape by appropriate means, such as a shaping | molding means, is used.
The field magnets 22 are magnetized to single poles so as to have different poles in the inner and
outer circumferences, and in this embodiment, the inner circumference is magnetized to the S
pole and the outer circumference to the N pole. It is monopolar. A cone-shaped frame 23 is fixed
to the upper part of the stator 20, and this stator 20 is. A peripheral edge portion of a coneshaped vibrating body 24 is joined to the upper end peripheral edge portion of the frame 23
which may be integrally formed with the frame 23 by an adhesive or the like together with a
gasket (not shown). The above-mentioned field magnet 22 is connected to the lower end
cylindrical portion 24 a of the vibrating body 24 so that reciprocal vibration can be made in the
magnetic gap 21 in the axial direction. Between the frame 23 and the cylindrical portion 24a, the
field magnet 22 is held at the central portion of the magnetic pole and supported by a damper 25
for damping the vibration appropriately, and the field magnet 22 is ! It is made to position
correctly in the magnetic air gap 21 of 7ji circuit 16). Further, a dust cap 26 such as a dustproof
cloth is attached to the upper surface of the central portion of the vibrating body 24 so that dust
in the air does not intrude into the magnetic gap 21. [Second Embodiment of the Invention] FIG.
3 shows a magnetic circuit 27 of a dynamic cone loudspeaker 15 'according to a second
embodiment of the present invention. The problem with this embodiment is that the field magnet
that constitutes the vibrator is always constant by allowing substantially uniform magnetic flux
to be applied to the vibration force generation coil at any position within its movable stroke. In
order to obtain an oscillating force having a magnitude based on the ratio of ?, an acoustic
signal f with good performance is obtained. The magnetic circuit 27 will be described below with
reference to FIG. In the dynamic cone speaker 15 having the magnetic circuit 16 shown in FIG. 1
and FIG. 2 in ffi, the pole piece 17 has a suitable length in the axial direction. Depending on the
position of the field magnet 22 in the magnetic gap 21 due to the deflection of the magnetic flux
distribution at the upper and lower axial ends of the field magnet 22 at the upper and lower axial
ends, a field is generated based on a predetermined acoustic signal. Even when the magnet 22 is
to be vibrated, the vibration force and the vibration response of the field magnet 22 are greatly
affected. As a result, an acoustic signal with good performance can be obtained by being able to
vibrate at a uniform size based on a constant ratio at any position within the axial movable stroke
in the magnetic gap 21 of the field magnet 22. It is desirable to be able to
For this purpose, in the speaker 15 ', as shown in FIG. 3, in the magnetic circuit 27, the field
03-05-2019
7
magnet 22 and the pole piece 17 are formed under the conditions defined below. In addition,
since the rule of the embodiment shown here can be commonly adopted to the other
embodiments, the rules described in this embodiment may naturally be taken into consideration
in the other embodiments as necessary. Needless to say. In the loudspeaker 15 'described in this
embodiment with reference to FIG. 3, the axial length m of the pole piece 17 is m, where m is the
axial length of the pole piece 17 in order to achieve the above-mentioned problem. To. m =
L?X??? = ?a + ?bm> X> ?> ?a, ?b where L: axial length of field magnet X: length of
vibration stroke of field magnet ?: axial direction of field magnet In order to suppress the
fluctuation of the magnetic distribution small by the magnetic flux distribution at the end of the
frame, the length ?a: ? for lengthening the field magnet excessively: the sag of the magnetic
flux distribution at the upper end in the direction of the field magnet Length ?b to lengthen the
upper end of the field magnet excessively in order to keep the fluctuation of the magnetic
distribution small: the fluctuation of the magnetic distribution is kept small by the deflection of
the magnetic flux distribution at the axial lower end of the field magnet By setting the length of
the lower end of the field magnet to an extra length, the vibration force generating coil 18
receives the magnetic flux from the field magnet 22 within the magnetic gap 21. The cloth can
be made almost even. As a result, the oscillating force obtained by energizing the @ power
generation coil 18 has a magnitude based on a fixed ratio because the magnetic flux distribution
is substantially uniform within the movable stroke of the field magnet 22, A speaker 15 ? ? can
be formed that can obtain an acoustic signal with good performance. FIG. 4 is a longitudinal
sectional view of a dynamic cone speaker 28 according to the present invention. The third
embodiment of the present invention will be described below with reference to FIG. The same
reference numerals as in the first embodiment denote the same parts as in the first embodiment,
and a description thereof will be omitted. A dynamic loudspeaker 28 according to a third
embodiment of the present invention is cylindrical in the longitudinal section through the inner
surface of the field magnet 22 and the fine annular magnetic gap 29 in the radial direction in the
loudspeaker 15 according to the first embodiment. The center ball 30 is formed to close the
magnetic path in the magnetic circuit 31 almost completely to obtain a larger vibrational force.
The center ball 30 made of a magnetic material formed at a stator of 20 ░ may be formed by
vertically integrally forming a cylindrical magnetic material extending upward in the axial
direction at the bottom of the cup-shaped magnetic member 19 with the magnetic member 19 or
appropriate. It forms by fixing using a means.
In the speaker 28 of the third embodiment, the center ball 30 is provided on the inner peripheral
portion of the field magnet 22 to sufficiently close the magnetic path. Therefore, vibration is
large compared to the speaker 15 of the first embodiment. Although a force is generated, a
phenomenon in which the generated sound is somewhat dull may occur depending on certain
specifications. Therefore, it is necessary to optimally design the components of the speaker 28 in
consideration of the specification, cost and the like. [Fourth Embodiment of the Invention] The
loudspeakers 15.15 'and 28 of the first to third embodiments each have an outer periphery
03-05-2019
8
driving type structure, but in this fourth embodiment, referring to FIG. 5, the inner periphery is
shown. The driven dynamic cone speaker 32 will be described. In the same place as the first
embodiment. The same reference numerals are given and the description thereof is omitted. The
magnetic circuit 33 of the dynamic loudspeaker 32 according to the fourth embodiment of the
present invention opposes the field magnet 22 via the inner circumference of the field magnet 22
via the fine annular magnetic gap 34 in the radial direction. A cup-shaped stator made of a
magnetic body in which a cylindrical stator magnetic member 36 is formed by fixing a magnetic
pole piece 35 similar to the above-mentioned magnetic pole piece 17 to the field magnet 22 side,
that is, the outer peripheral direction Mainly formed at 37. The stator magnetic member 36 has a
magnetic pole of N pole or S pole on the surface facing the inner circumferential surface of the
field magnet 22 axially movably supported in the annular magnetic gap 34 via the magnetic gap
34 in the radial direction. On the inner surface of the ring-shaped magnetic pole piece 35 which
can be formed, a coil storage concave portion 38 for generating a vibration force is formed by
integrally forming the magnetic member 36 and forming a U-shaped longitudinal section. The
vibration force generating coil 18 formed in a ring shape is accommodated and fixed in the
vibration force generating coil accommodation recess 38. Lead wires (not shown) of the vibration
force generating coil 18 are led to an external circuit through the through holes (not shown)
formed in the magnetic member 36 and the stator 37. The stator 37 is formed in a cup shape
having a collar 37a at the upper end, and the upper collar 37a is fixed to the frame 23 by an
appropriate means. The stator 37 may be integrally formed with the frame 23. If the stator 37 is
formed of a magnetic material, the outer periphery of the field magnet 22 is opposed to the
annular magnetic gap 39 in the radial direction. The circumferential surface 37b of the cupshaped stator 37 can also function as a back yoke for closing the magnetic path of the field
magnet 22. [Fifth Embodiment of the Invention] A dynamic cone speaker 32 ? ? according to a
fifth embodiment of the present invention shown in FIG. 6 corresponds to the dynamic cone
speaker 28 shown in FIG. Shown is an example of a magnetic circuit 33 'which is configured as a
closed cup-shaped stator magnetic member 36' and is separated from the cup-shaped stator 37
'and can be fixed to each other by an appropriate member. .
The sixth embodiment of the dynamic cone speaker according to the sixth embodiment of the
present invention shown in FIG. 7 is a magnetic circuit 33 ░ 'of the second embodiment of the
present invention shown in FIG. Instead of the stator 37 having the magnetic member 36, in
order to easily accommodate the vibration force generation coil 18, a vibration force generation
coil storage portion 38 'having a V-shaped longitudinal cross section is formed, and only this is
made of a magnetic material. After forming the pole piece 35 ░ similar to the pole piece 35 and
attaching the coil 18 to the coil housing portion 38 ? made of the magnetic body, the coil 18 is
attached to a predetermined mold, and the other parts are all A stator 37 ? ? is integrally
formed by molding a plastic mold and integrally forming a cylindrical support portion 36 ?
having the same shape as the magnetic member 36 and the housing portion 38 ░. In this case, if
plastic is molded with a magnetic powder-filled plastic, such plastic also has an appropriate
03-05-2019
9
magnetic permeability. The desired magnetic circuit 33 '' can be configured. [Operation of the
invention] In the embodiment of the present invention, its principle of operation is. Since all of
them are the same, to explain collectively, when alternating current of a magnitude based on an
acoustic signal is supplied to the vibration force generating coil 18 at the speakers 15, 15 ',
28.32.32', 32.degree. The magnetic poles of the N pole and the S pole are formed so as to
alternately have different poles within one pole piece 17, 35 ░ 35 ░ within one pole piece 17,
35 ░ 35 ░ 35 ░ Since the field magnet 22 repeats attraction and repulsion, it generates a force
that causes the field magnet 22 to oscillate back and forth along the axial direction of the
magnetic gap 21. 34. Reciprocate along the axial direction in .34. For this reason, the vibrating
body 24 fixed to the field magnet 22 oscillates back and forth, and an acoustic signal sound of an
appropriate wavelength and size can be generated. [Effects of the Invention] As apparent from
the above-mentioned constitution, according to the present invention, the vibration force
generating coil forms a pole piece on the surface facing the field magnet via the cylindrical
magnetic gap in the radial direction. Therefore, the magnetic flux can be efficiently collected, and
as a result, since the N pole and the Sfl magnetic pole are alternately formed in the relevant pole
piece, a large vibrational force is generated, and the field magnet can be reciprocated with good
response. Since this can be performed, there is an effect that an electrodynamic electroacoustic
exchanger capable of generating or receiving a highly sensitive acoustic signal can be obtained.
Further, in the present invention, since the above magnetic pole piece can be effectively used,
that is, the coil storage portion for generating vibration force can be formed of a magnetic body,
and the coil for generating vibration force can be held. There is an effect that the coil can be
stored and protected rationally in the coil storage portion.
In the present invention, the axial length m of the magnetic pole piece is m = L, -X-?? = ?a +
?bm> X> ?> ?, ?b where L: axial length X of the field magnet: field Vibration stroke length ?
of the magnet: Length ? a for lengthening the field magnet excessively in order to suppress the
fluctuation of the magnetic distribution 2 by the deflection of the magnetic flux distribution at
the axial end of the field magnet: ?: Length of the upper end of the field magnet is excessively
increased to suppress the fluctuation of the magnetic distribution small due to the magnetic flux
distribution at the upper end in the direction of the field magnet. The length of the lower end of
the field magnet is set to be extra long in order to keep the variation of the magnetic distribution
small by the deflection of the magnetic flux distribution at the lower end, so that the vibration
force generating coil is in the magnetic gap. The magnetic flux distribution received by the field
magnet can be made substantially uniform. As a result, the oscillating force obtained by
energizing the oscillating force generating coil has a size based on a fixed ratio since the
magnetic flux distribution is substantially uniform within the movable stroke of the field magnet,
and the performance is good. There is an effect that an acoustic signal can be obtained. In
addition, it is not necessary to use a voice coil, which is troublesome and effective as in the prior
art, and because the field magnet is made to move without moving the coil, it is caused by
dragging the lead wire and vibrating. It is possible to obtain a highly reliable and long-lived
03-05-2019
10
electrodynamic electroacoustic exchanger without any breakage due to lead wire cutting or
solder detachment. In addition, since the troublesome step of soldering both terminals of the lead
wire of the coil for generating a vibrational force to a 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 inexpensively and easily using various materials such as thin film
plastic of desired use and material. In addition, the field magnet (for example, specific gravity 4
to 6) has a specific gravity smaller than that of the conducting wire (specific gravity 7), and by
using a magnetic material that can increase the magnetic force, the weight of the vibrator is
reduced and the response speed is also reduced. It has been difficult in the prior art because it is
faster and audio signals can be extracted more accurately over a wide range. In particular, there
is an effect that inexpensive ones can be configured with good efficiency that can extract
dynamic bass acoustic signals. Furthermore, since a sufficient storage space for the vibration
generating coil can be obtained and the coil can not be moved, the very troublesome wires for
forming the voice coil are closely attached so as not to overlap as in the prior art. Since it is
possible to adopt a glass winding which does not require the close-winding method of winding in
a single row, manufacturing of the winding of the coil for generating a vibrational force is
extremely easy, the defect rate is reduced, And there is an effect which can be mass-produced
easily.
Furthermore, even if the thickness is small, a strong magnetic force can be generated (in
particular, recent magnet technology has made this possible). Magnet material (in this case, as a
field magnet, it has a specific gravity lighter than the specific gravity of the wire that particularly
constitutes a coil. If a magnet material is used, the effect of the present invention will be further
enhanced). In addition to forming a field magnet, it is possible to use an oscillating force
generating coil such as a ring shape having a large number of turns. Since a large driving force
for vibrating the field magnet can be generated by using the vibration force generating coil in
which a large number of turns of lead wires are formed, particularly in the case of a dynamic
bass acoustic signal. There is an effect that an audio signal can be accurately extracted. In
particular, in the case of a main specification where it is desired to obtain a large vibration force,
driving force TT = t?It: number of turns of the wire to make the field magnet vibrate now:
number of turns t of the wire at current Since a large value can be obtained, a large driving force
T can be obtained, and the value of the current I can also be reduced, so that there is an effect
that an electrodynamic electroacoustic exchanger such as an efficient speaker can be obtained. 1
(Note that although the embodiment of the present invention has mainly described the speaker,
the present invention is naturally applicable to other electrodynamic electroacoustic exchangers
such as a microphone having a common structural principle.
[0002]
03-05-2019
11
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, FIG. 2 is a longitudinal sectional view of the same, and FIG.
3 is a second embodiment of the present invention. FIG. 4 is an explanatory view of the
relationship between a field magnet and a pole piece for showing, and FIG. 4 and FIG.
FIG. 6 is a longitudinal sectional view of a dynamic cone loudspeaker according to a fourth
embodiment, and FIGS. A longitudinal sectional view for explaining the configuration of the
magnetic circuit of the dynamic cone loudspeaker according to the sixth embodiment, and FIG. 8
is a longitudinal sectional view of a conventional dynamic cone loudspeaker. [Description of the
code] 1: Dynamic cone speaker. 2 ... Center ball (central magnetic pole). 3 ... Center ball, 4 ...
Permanent magnet. DESCRIPTION OF SYMBOLS 5 ... Upper yoke plate, 6 ... Field part 7 ... Frame
8 ... Gasget (arrow paper), 9 ... Vibrator, 10 ... Voice coil, 11 ... Coil bobbin 12 Damper 13
magnetic gap 14 dust cap 15, 15 ░ dynamic cone speaker 16 magnetic circuit. 17 и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и. 19b и и и outer
circumference, 19C и и и и coil storage recess for generating vibration force, 20, 20 ░ и и и и и stator.
21 и и Annular magnetic gap, 22 и и и Field magnet, 23 и и и и и и и и и и и и и 24 и и и и и и и и и и и и и и 26 и и и 26
dampers 26 dust caps ... Magnetic circuit, 28 ... Dynamic cone speaker, 29 ... Annular magnetic
gap, 30 ... Center ball, 31 ... Magnetic circuit. ???????????????????????
?????? 33.33 ', 33' ... magnetic circuit. 34 и и и annular magnetic air gap, 35. 35 'и и и pole
piece, 36, 36 ░ и и и и и stator magnetic member. 36 "" и и и Cylindrical support. 37. 37 ░, 37 ░ '...
Stator. 37a: upper end butt, 37b: circumferential surface. 38.38 'и и и и Coil housing recess for
generating vibration force, 39 и и и Annular magnetic gap. Figure 8
03-05-2019
12
Документ
Категория
Без категории
Просмотров
0
Размер файла
30 Кб
Теги
jph0217799
1/--страниц
Пожаловаться на содержимое документа