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JPH03101600

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DESCRIPTION JPH03101600
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer such as a speaker utilizing electromagnetic induction. SUMMARY OF
THE INVENTION The present invention relates to an electroacoustic transducer, in which the
efficiency is improved by reducing the substantial gap width by forming the feeding coil by using
a conductive wire of which at least the surface is made of iron. It is intended to [Prior Art] A feed
coil is provided in proximity to and opposed to a conductive portion as a voice coil fixed to a
diaphragm, and an audio signal current is supplied to the feed coil, and from the feed coil to the
conductive portion by electromagnetic induction. A speaker (electro-acoustic transducer) has
been proposed in which an audio current is supplied to drive a diaphragm (see, for example,
Japanese Utility Model Laid-Open Publication No. 50-105438). FIG. 3 shows the structure of an
example of such a speaker. In this figure, a cylindrical pole piece (2) is formed at the center of
the disc-shaped yoke plate (1). A ring-shaped magnet (3) is stacked and fixed on the yoke plate
[1], and a ring-shaped top plate (4) is stacked and fixed on the magnet (3). これらヨークプレー
)(1)。 The pole piece (2), the magnet (3), and the tub plate (4) constitute an external
magnetic circuit. Furthermore, a feed coil (5) is wound around the inner periphery of the top
plate (4), and lead wires (9A) and (9B) are led out from the feed coil (5). (IOA) and (10B) are the
terminals. The dome-shaped diaphragm (6) is integrally formed of a metal such as aluminum, and
the opening edge of the diaphragm (6) forms a conductive portion (7). The conductive portion (7)
operates as a one-turn voice coil. The diaphragm (6) may be formed of an insulator such as a
polymer film or a ceramic, and a conductor may be disposed in the conductive portion (7). A
magnetic gap is formed in the space where the outer periphery of the pole piece (2) and the
inner periphery of the top plate (4) face each other, and the conductive portion (7) integrated
with the diaphragm (6) And the diaphragm (6) is vibratably supported via the damper (8). The
damper (8) may be formed integrally with the diaphragm (6). This speaker is the terminal (IOA)
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of the lead wire (9A), (9B). It is driven by supplying an audio signal to (10B). Terminal (IOA), (toe)
to lead wire (98). When an audio current flows through the feeding coil (5) through (9B), a
magnetic flux is generated in the feeding coil (5) by the audio current.
This magnetic flux intersects with the conductive portion (7) disposed opposite to the feeding
coil (5). As a result, an induced current flows to the conductive portion (7). On the other hand,
the conductive portion [7] is located in the magnetic gap formed in the gap where the outer
periphery of the pole piece [2] and the inner periphery of the top plate (4) face each other. Flows,
a force is generated to move the conductive portion (7). The force causes the diaphragm (6)
integrated with the conductive portion (7) to vibrate. Therefore, in such a speaker, if an audio
current is supplied to the feeding Koino 5), the audio current can flow in the conductive portion
(7) as a voice coil, so it is necessary to lead out the lead from the voice coil along the diaphragm.
Therefore, it is possible to prevent the disconnection of the lead wire and the deterioration of the
sound quality due to the lead wire. FIG. 4 is an example in which the feeding coil (5) is wound
around the outer periphery of the pole piece (2). Also in this example, the same operation as the
above-mentioned conventional example is performed. [Problems to be Solved by the Invention]
However, in the above-mentioned conventional example, the feeding coil (5) is usually formed
using non-ferrous wire such as copper wire or aluminum wire. Therefore, by providing the
feeding coil (5), the gap width of the magnetic circuit is increased by the thickness, the magnetic
flux density is reduced, the driving force is reduced, and the efficiency is reduced. This
application has been made in view of these points, and aims to improve efficiency by reducing
the substantial gap width. [Means for Solving the Problems] In the present invention, a
diaphragm (6) provided with an annular conductive portion (7), and a feed coil arranged to face
the conductive portion at a predetermined distance 5) and an electroacoustic transducer
comprising the magnetic circuit parts (1) to (4) to which the feeding coil is attached, wherein at
least the feeding coil is formed of iron at least by a conductive wire (11) It is an electroacoustic
transducer characterized by forming using the following. [Operation] According to this, by
forming the feeding coil using the conductive wire having at least the surface formed of iron, the
gap width of the magnetic circuit is substantially reduced, thereby improving the efficiency. Can.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT First, FIG. 1 is an example of the
case where a feeding coil (5) is attached to the inner periphery of a top plate (4). In this figure,
the feed coil (5) is formed by a conductive wire (11) made of, for example, an iron wire.
With this feeding coil (5) attached to the top plate (4), the iron conductive wire (11) forming the
feeding coil (5) is inserted into the gap of the magnetic circuit, This is substantially equivalent to
reducing the gap width. Also, the iron conductive wire (11) can sufficiently pass the magnetic
lines of force, so that the magnetic flux density in this gap increases, and the driving force can be
increased to improve the efficiency. Thus, according to the above-described configuration, the
gap width of the magnetic circuit is substantially reduced by forming the feeding coil by using
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the conductive wire having at least the surface made of iron, thereby improving the efficiency. It
is possible to Further, FIG. 2 shows an example in the case of attaching the feeding coil (5) to the
outer periphery of the pole piece (2). In this figure, a feed coil (5) provided on the outer
periphery of the pole piece (2) is formed of a conductive wire (11) made of, for example, an iron
wire. Also by this, it is possible to obtain the same effect as the above-mentioned example. In any
of the above-described examples, the conductive wire (11) does not have to be iron to the center,
and the same effect can be obtained even if iron plating is applied to the surface of any wire. The
conductive wire (11) may be a so-called flat coil. Furthermore, the feeding coil (5) by these
conductive wires (11) can be attached to the top plate (4) or the pole piece (2) by press-fitting or
an adhesive. According to the present invention, the gap width of the magnetic circuit is
substantially reduced by forming the feeding coil using the conductive wire having at least the
surface made of iron, whereby the efficiency is improved. It became possible to improve it.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of an example in which the electro-acoustic transducer according to the
present invention is mounted on the inner periphery of the top plate, and FIG. 2 is mounted on
the outer periphery of the pole piece. FIG. 3 is a block diagram of an example of a conventional
speaker, and FIG. 4 is a block diagram of an example of a conventional speaker.
(1) is a yoke plate, (2) is a pole piece, (3) is a magnet, (4) is a top plate, (5) is a feeding coil, (6) is
a diaphragm, (7) is a conductive portion, (8 Is a damper (9 ^), (9B) is a lead wire, (IOA), (10B) is a
terminal, and (11) is a conductive wire. Hidetoshi Matsushima, manager
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