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JPS62193499

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DESCRIPTION JPS62193499
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electro-acoustic transducer such as a speaker as a receiving unit and a microphone unit as a
transmitting unit for use in, for example, a telephone 2 communication apparatus. Prior Art FIG.
2 is a cross-sectional view of a configuration example of a conventional electrodynamic
transmitting / receiving unit, wherein 1 is a baffle plate, 2 is a diaphragm, 3 is a voice coil, 4 is a
voice coil lead, 5 is a top plate, 6 is a magnet, 7 is a plate with a center pole, 8 is a frame, 9 is a
terminal, and 1o is a back cover. A top plate 6, a magnet 6, and a plate 7 with a center pole are
combined to form a magnetic circuit having a concentric magnetic gap, and is coupled to the
inside of a frame 8 formed of resin or the like to constitute a housing assembly. . The voice coil 3
is adhered to the diaphragm 2 formed of a resin film to form a vibration system, and the
peripheral portion of the vibration plate 2 of the vibration system is adhered to the inner
periphery of the guide of the frame 4 of the housing assembly. The leads 4 are connected to the
terminals 9 provided on the frame 8. Furthermore, a baffle plate 1 molded of a resin having a
vent is disposed on the front surface of the diaphragm 2, the buckle plate 1 and the frame 8 are
bonded, and a back cover 1Q constituting an acoustic circuit is bonded to the frame 8 And an
electroacoustic transducer as a microphone unit. In the above configuration, the buckle plate 1
has a guide to be fitted to the diaphragm guide of the frame 8 and adheres the fitting portion,
and the guide portion of the frame 8 is missing for drawing out the voice coil lead 4 However, in
the above-described conventional configuration, the magnetic flux leaked to the front of the
magnetic gap is the front of the unit, and further, It leaks to the front of the mounting housing,
such as handsets used for telephones, and sucks pins on the tabletop, etc. With danger as these
units used especially close to the face of the human body There is. FIG. 3 is a cross-sectional view
of another conventional example of the configuration of the electroacoustic transducer as the
speaker and the microphone unit, 11 is a front cover, 12 is a diaphragm, 13 is a voice coil, 14 is
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a voice coil lead, 16 is a top plate, 16 is a magnet, 1 is a plate with a center pole, 'BIr! -Frame, 19
is a terminal, and 20 is a back cover. Similar to FIG. 2, inside the frame 18, the top plate 15..
???????? A vibration system in which the diaphragm 12 and the voice coil 13 are
bonded is bonded to a housing assembly formed with a magnetic circuit in which the plate 17
with center pole is combined, and the voice coil lead 14 and the terminal 19 are connected.
Further, a cover 11 formed of a high magnetic permeability material having a vent is disposed on
the front surface of the diaphragm 12, and the back cover 20 is adhered to the frame 14 to
constitute an electroacoustic transducer as a speaker and a microphone unit. In the above
configuration, the cover 11 forms a magnetic circuit from the front of the magnetic gap to the
plate 17 with the center pole, and the magnetic flux leaked from the front of the magnetic gap
passes through the cover 11 and the plate 17 with the center pole. As it heads to the front, the
leakage flux to the front of the unit is reduced. However, in the conventional configuration of FIG.
3, the acoustic space and the conductive portion are not separated, and when the human body to
be used is charged with static electricity, spark discharge to the terminal 19 occurs via the cover
11. The discharge in this case occurred in the vicinity of the mouth and ear of the human body
because these units were used in the near sound field as a telephone and a communicator, and
was very unpleasant and dangerous. The present invention solves the above-mentioned
conventional problems, aims to reduce the leakage flux and separate the acoustic space and the
conductive part in the same unit, and attracts the pins etc. by the leakage flux and spark
discharge from the charged human body. And to provide an electroacoustic transducer free from
discomfort and danger. Means for Solving the Problems In order to achieve the above object,
according to the present invention, the baffle plate has a three-layer structure of insulating
material-high permeability material-insulation material, and high permeability material is a plate
with a center pole. The magnetic circuit is used to extend the magnetic flux to the front of the
magnetic gap toward the plate with the center pole. Operation With the above configuration, the
magnetic flux leakage to the front of the unit is reduced, and conductive parts such as magnetic
circuits and terminals are separated from the acoustic space by the structure of the frame and
baffle plate, or the distance is increased to charge the human body. Spark discharge can be
eliminated more. Embodiment An embodiment of the present invention will be described with
reference to FIG. FIG. 1 is a cross-sectional view of an electro-acoustic transducer that can be
used as a speaker and a microphone unit in an embodiment of the present invention, 21 is a
baffle plate, 22 is a diaphragm, 23 is a voice coil, 24 is a voice coil lead 26 is a top plate, 26 is a
magnet, 27 is a plate with a center pole, 28 is a frame, 29 is a shield plate and terminal, and 30 is
a back cover.
????????? ???????? A center pole attached plate 27 is combined to form a
magnetic circuit 32 having a concentric magnetic air gap 31 and coupled to the inside of a frame
28 formed of an insulating material such as resin, thereby forming a housing assembly. The voice
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coil 23 is adhered to a diaphragm 22 formed of a resin film to form a vibration system, and the
peripheral portion of the imaging plate 22 of this vibration system is adhered to the inner
periphery of the guide 33 of the frame 28 of the housing assembly. Do. A baffle plate 21 is
disposed on the front surface of the imaging plate 22 and has a vent hole, and a shield plate /
terminal 29 made of high magnetic permeability material such as iron is molded in an insulator
such as resin and adhered to the frame 28 The back cover 30 is bonded to the frame 28 to
constitute an electroacoustic transducer. In the above configuration, the baffle plate 21 molded
of a high magnetic permeability material has a guide 34 to be fitted with the diaphragm outer
peripheral guide 33 of the frame 28, and the fitting portion is bonded and the voice coil lead 24
is drawn out. The acoustic space of the front surface of the diaphragm 22 and the conductive
portion such as the shield plate / terminal 29 are separated by filling the guide portion 34 of the
frame 28 which is missing due to an adhesive or the like. Furthermore, a shield plate / terminal
29 made of a high magnetic permeability material such as iron molded on the baffle plate 21 has
a vertical portion reaching the center ball plate 27 on the outer periphery of the diaphragm
guide portion 33 of the frame 28 The magnetic circuit 32 is configured to direct the leakage flux
to the front surface 31 to the plate 27 with the center ball. With this configuration, the discharge
path when the charged object approaches the front surface of the unit becomes a path along the
outer wall of the unit, which makes it difficult to cause dielectric breakdown. Furthermore, even
when dielectric breakdown occurs, spark discharge hardly occurs, resulting in discharge in which
high resistances are connected in series. In addition, the leakage flux from the magnetic gap 31
also passes through the magnetic circuit 32 and the plate 27 with the center pole by the shield
plate / terminal 29 made of high permeability material such as iron molded in the baffle plate 21
to the front of the unit Leakage flux is reduced. Effects of the Invention As described above,
according to the present invention, the magnetic circuit that directs the leakage flux to the front
of the magnetic gap to the plate with the center pole is made of a high permeability material, and
the high permeability material located on the front surface of the diaphragm is a resin. By
adopting a configuration in which the acoustic space in front of the diaphragm, the magnetic
circuit, and the conductive part are separated or the distance is increased by using a baffle plate
as an equal insulator and further by connecting the powerful plate and the frame, It is possible to
provide a safe and comfortable electro-acoustic transducer without spark discharge from the
charged human body to the terminal and without adsorption of the pin of the table due to
leakage flux, which is of great industrial value.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a sectional view showing the construction of an embodiment of the electroacoustic
transducer according to the present invention, and FIGS. 2 and 3 are sectional views showing the
construction of a conventional electroacoustic transducer.
21 ииииии Baffle plate, 22 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 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 shield plate and terminal, 3 o и и и ..... back cover,
31. Name of agent Attorney Nakao Toshio And one other person? ! --- Bar l Fluo tile? ? --- O 9 and
t Khao tile? ?????????????????????????? ??? -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 2-2-Mcnach L7-
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