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JPH041000

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DESCRIPTION JPH041000
[0001]
TECHNICAL FIELD The present invention relates to a speaker unit having a diaphragm speed
detection mechanism. 2. Description of the Related Art In recent years, with the development of
electronics technology, the miniaturization and high performance of devices have been achieved,
and it is also required that the speaker system be small and capable of reproducing even bass. As
a method of miniaturizing a speaker system, moral feedback (MFB) is effective, and has been
used relatively frequently in the past. The MFB is intended to improve the characteristics
including the speaker by detecting an output proportional to the movement of the diaphragm of
the speaker and feeding it back to the drive amplifier, and a speaker unit is used to detect the
speed, amplitude, etc. of the diaphragm. I need. Conventionally, as a speaker unit having this kind
of diaphragm speed detection mechanism, there are those shown in FIG. 4 and FIG. In FIG. 4, the
voice coil 52 is wound around a bobbin 51, and is connected to terminals 78. 79 by lead wires
70.71. One end of the bobbin 51 is coupled to the diaphragm 62. The detection coil 54 is wound
around the bobbin 53 and connected to the terminals 80.81 by lead wires 72.73. One end of the
bobbin 53 is coupled to a center cap 63 coupled to the diaphragm 62 via a coupling member 64.
The diaphragm 62 is held by an edge 6 o 1 damper 61 whose one end is fixed to the frame 55.
またヨークブレート56. The center pole 57 ° magnet 58. The driving portion magnetic
circuit 74 is constituted by the yoke 59, and the voice coil 52 accommodated between the
magnetic air gaps formed by the yoke plate 5θ and the center pole 57 receives the action of the
magnetic flux in the air gaps. Further, a detection unit magnetic circuit 75 is constituted by the
center pole 57 and the pole piece 50 fitted in the thickness reducing portion, and the detection
coil 54 housed between the center pole 57 and the magnetic gap formed by the pole piece 50 is
Under the action of magnetic flux in the air gap. In the above configuration, when a drive current
flows between the terminals 78 and 79, the voice coil 52 vibrates in proportion to the drive
current by the action of the magnetic flux generated by the drive magnetic circuit 74, and the
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diaphragm 62 vibrates through the bobbin 51. This vibration is the center cap 63. A voltage
proportional to the vibration velocity of the diaphragm is generated between the terminals 80.81
by the action of the magnetic flux transmitted to the detection coil 54 through the connecting
member 64 ° bobbin 53 and generated by the detection unit magnetic circuit 75.
Further, in FIG. 5, the voice coil 52 is wound around the bobbin 51, and is connected to the
terminals 78. 79 by lead wires 70. 71, respectively. One end of the bobbin 51 is coupled to the
diaphragm 62. The diaphragm 62 is held by an edge 80 and a damper 81 whose one end is fixed
to the frame 55. The detection coil 54 is wound around a bobbin 53 and connected to terminals
80.81 by lead wires 72.73. The bobbin 53 is coupled to the diaphragm 62 via the coupling
member 64. またヨークプレート55. センターポール56. The magnet 58 and the yoke 59
constitute a drive magnetic circuit 74, and the yoke plate 55. The voice coil 52 accommodated
between the magnetic gaps formed by the center pole 56 is affected by the magnetic flux in the
gaps. Also, one yoke plate 67, center pole 70. マグネット68. The detection portion magnetic
circuit 75 is constituted by the yoke 69, and the detection coil 54 accommodated between the
magnetic air gaps formed by the yoke plate 67 and the center pole 70 receives the action of the
magnetic flux in the air gaps. Further, the detection unit magnetic circuit 75 is attached to a fixed
frame 77 coupled to the frame 55 by a member 76 on the front surface of the diaphragm. Also in
this configuration, as in the case of FIG. 4, when a drive current is applied between the terminals
7B and 79, a voltage proportional to the vibration speed of the diaphragm 62 is generated
between the terminals 80.81. FIG. 6 is an MFB circuit diagram using a speaker having a
diaphragm speed detection mechanism as shown in FIGS. 4 and 5, and a voltage proportional to
the speed of the diaphragm generated by the detection coil is returned By doing this, it is
possible to improve low frequency characteristics such as expansion of the bass reproduction
limit and reduction of distortion. SUMMARY OF THE INVENTION A speaker unit having a
conventional detection mechanism requires a special component different from a normal
magnetic circuit component, such as the center pole shown in FIG. 4, or a normal magnetic
circuit component Even in the case of using a sensor, as shown in FIG. 5, the detection unit
magnetic circuit must be installed on the front surface of the diaphragm, and a complex
transmission frame for transmitting vibration of the diaphragm and a complex frame for
supporting the detection unit magnetic circuit. There are many manufacturing issues such as the
need for structure. Also, as in the speaker unit of FIG. 5, when there is an acoustic obstacle such
as a detection unit magnetic circuit on the front of the diaphragm, the sound wave emitted from
the diaphragm is adversely affected by reflection, resonance 9 diffraction, etc. And sound
pressure frequency characteristics are disturbed.
In order to solve the above problems, the present invention provides a speaker having a
diaphragm speed detection mechanism which does not require special magnetic circuit parts,
complicated vibration transmission mechanisms and frame structures, and does not disturb
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sound pressure frequency characteristics. The purpose is to provide a unit. Means for Solving the
Problems In order to achieve the above object, there is provided a cylindrical bobbin having a
foil-like coil whose surface is subjected to an insulating treatment on a sheet substrate, and a
conductive material wound around the outer periphery of the cylindrical bobbin. It has a coil
made of a wire, and a lead wire is drawn from each coil to make a foil-like film a diaphragm
speed detection coil, and a coil made of a conductive wire is a voice coil. Operation With the
above-described configuration, the present invention does not require a special magnetic circuit
or a complicated vibration transmission mechanism and frame structure to realize the diaphragm
speed detection mechanism, and does not disturb the sound pressure frequency characteristics.
Embodiment An embodiment of the present invention will be described with reference to the
drawings. FIG. 1 is a cross-sectional view of a speaker unit according to an embodiment of the
present invention, FIG. 2 is an enlarged cross-sectional view around a voice coil of the speaker
unit of the present invention, and FIG. 3 is a voice coil bobbin of the speaker unit of the present
invention. It is a perspective view. In FIG. 1, FIG. 2 and FIG. 3, after the foil-like conductive
material is laminated on the sheet base material 2, it is etched so as to constitute the detection
coil 3 and the insulating film 4 is stuck. Is configured. Furthermore, a tfli material is wound
around the outer periphery of the bobbin 1 to constitute a voice coil 5. The detection coil 3 is
connected to the terminals 19 ° 20 by lead wires 6 and 7, and the voice coil 5 is separately
connected to the terminals 21 and 22 by lead wires 8 and 9, respectively. One end of the bobbin
1 is adhered to the diaphragm 10, and the diaphragm 10 is held by an end 17 and a damper 18
whose one end is fixed to the frame 11. またヨークプレート12. マグネット13. A magnetic
circuit 16 is constituted by the yoke 14 and the center pole 15, and the yoke plate 12. The voice
coil 5.degree. Detection coil 3 placed between the magnetic gaps between the center poles 15 is
both affected by the magnetic flux passing through the gaps. The operation of the speaker unit
configured as described above will be described below. When a drive current flows between the
terminals 21 and 22, the voice coil 5 is vibrated by the action of the magnetic flux generated by
the magnetic circuit 16 and the diaphragm 12 is moved through the bobbin 1. At the same time,
the detection coil 3 is vibrated and the magnetic flux generated by the magnetic circuit 16
Generates a voltage between terminals 19.20.
This voltage is proportional to the diaphragm speed. An MFB circuit as shown in FIG. 6 is
configured by using the above speaker unit, and a low frequency characteristic such as expansion
of a bass reproduction limit or reduction of distortion by feeding back a voltage proportional to
the velocity of a diaphragm generated by a detection coil. Can be improved. As described above,
according to the present invention, a special magnetic circuit component, a complicated vibration
transmission mechanism, and a frame structure are required to construct a speaker unit having a
diaphragm speed detection mechanism necessary to realize an MFB circuit. Also, since the
speaker unit has no obstacle in front of the diaphragm, the sound pressure frequency
characteristic is not disturbed. According to the present invention as described in detail,
according to the present invention, there is provided a cylindrical bobbin having a foil-like coil
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whose surface is subjected to an insulation treatment on a sheet substrate, and a conductive wire
wound around the outer periphery of the cylindrical bobbin. A special magnetic circuit
component, complex vibration transmission by having a coil made of a coil and drawing a lead
wire from each coil and configuring a foil coil as a diaphragm speed detection coil and a coil
made of a conductive wire as a voice coil Since a speaker unit having a diaphragm speed
detection mechanism which does not require a mechanism and a frame structure and does not
disturb the sound pressure frequency characteristic can be realized, the cost can be reduced and
the characteristics as a speaker unit can be maintained.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a sectional view of a speaker unit according to an embodiment of the present invention,
FIG. 2 is an enlarged sectional view of a voice coil of the speaker unit according to the
embodiment, and FIG. FIGS. 4 and 5 are cross-sectional views of a speaker unit having a
conventional detection mechanism, and FIG. 6 is an MFB circuit diagram.
DESCRIPTION OF SYMBOLS 1: .. Bobbin 2 ... Sheet base material 3 ... Detection coil 4 ... Insulating
film 5 ... Voice coil, 6.7 .. Lead wire for detection coil, 8, 9 ... Lead wire for voice fill, 10 ...
Diaphragm. Name of Agent Attorney Attorney Shigetaka Hagino 1 person 1-1-2-1 3 · 4 · · · 6, 7,
8-1 H · · Bobbin sheet 11 賓 ゴ U フ L − L-bite all voice film overdraw fill draw weft voice coil
draw weft riot deposit frame-61, 5-
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