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JPH0591591

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DESCRIPTION JPH0591591
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer, and more particularly to an electroacoustic transducer in which two
diaphragms are driven in the same direction by a driving magnet.
[0002]
2. Description of the Related Art A plurality of rod-like drive magnets are arranged in a plane to
generate magnetic flux from the N pole to the S station, and to cross the magnetic flux generated
from the N pole of the magnet to the S station. As a conductive electroacoustic transducer
including a diaphragm in which a conductor is disposed, one shown in FIG. 8 exists.
[0003]
In this electro-acoustic transducer, a rod-like magnet 2 having one side in the longitudinal
direction magnetized to the N pole and the other side to the S pole on the flat plate-like yoke 1
has the N pole and S The poles are arranged alternately, and a diaphragm 5 is attached to the
yoke 1 via a spacer 3 and a substrate 4.
[0004]
A conductor 6 is disposed on the upper surface of the diaphragm 5 so as to cross the magnetic
flux generated from the N pole of the plurality of magnets 2 to the S station, and the conductors
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6 are alternately connected to each other It has a meandering shape and is molded into a single
conductor.
Then, by applying an audio current to the conductor 6, the conductor 6 crossing the magnetic
flux formed by the magnet 2 moves the conductor 6 up and down on the sheet of FIG. 8
according to Fleming's left-hand rule. The diaphragm 5 attached with the conductor 6 is driven.
[0005]
In such an electro-acoustic transducer, a single diaphragm 5 is driven by a plurality of rod-like
magnets 2 mounted on the yoke 1, and the drive efficiency is relatively small.
[0006]
On the other hand, as shown in FIG. 9, the speaker box 10 is divided into two parts A and B, the
first electroacoustic transducer 11 is attached to the first box A, and the second of the back of
the first box A A speaker system of the type in which the second electroacoustic transducer 12 is
attached to the box B of FIG.
Then, the first electroacoustic transducer 11 and the second electroacoustic transducer 12 are
driven in phase with each other (in FIG. 9, the vibration directions of the respective diaphragms
are the same in the left and right directions), and the first electroacoustic transducer A
reproduction signal from the unit 11 is output to the listener.
[0007]
According to this format, the back pressure by the first electroacoustic transducer 11 is absorbed
by the second electroacoustic transducer 12, and the first electroacoustic transducer 11 is
attached to a so-called infinite baffle. Thus, the low frequency reproduction characteristics can be
improved.
[0008]
By the way, in the apparatus shown in FIG. 8, since a single diaphragm 5 is driven by a plurality
of rod-like magnets 2 mounted on the yoke 1, the driving efficiency is set. Has a problem that it
is relatively small, and the apparatus shown in FIG. 9 has a problem that the number of parts
increases because two sets of conductive drive units are required. have.
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[0009]
The present invention has been made in view of such a situation, and provides an electroacoustic
transducer capable of driving two diaphragms in the same phase with each other using one
magnetic circuit. Is an issue.
[0010]
SUMMARY OF THE INVENTION The electro-acoustic transducer according to the present
invention, which has been made to achieve the above-mentioned problems, is a magnet which
generates a magnetic flux from the N pole to the S station from both the front and back surfaces
A first diaphragm in which a conductor is disposed in a part of the surface of the magnet to cross
a magnetic flux generated from the N pole of the magnet to the S station, and a back surface of
the magnet; A second diaphragm in which the conductors are arranged to cross the magnetic flux
generated from the north pole of the magnet to the S station, and the respective conductors
arranged in the first and second diaphragms The present invention is characterized in that the
first and second diaphragms are driven in the same direction by causing the same audio signal to
flow.
[0011]
In the electro-acoustic transducer having the above-described structure, the conductor located on
the surface of the magnet is disposed at a position crossing the magnetic flux generated from the
N pole of the magnet to the S station. The voice current vibrates in a direction perpendicular to
the magnetic flux to drive the first diaphragm.
Since the conductor located on the back of the magnet is located at a position crossing the
magnetic flux generated from the N pole of the magnet to the S station, the voice current flowing
through the conductor vibrates in the direction perpendicular to the magnetic flux. The second
diaphragm is driven in the same direction as the first diaphragm.
[0012]
As a result, both the first diaphragm on the front surface and the second diaphragm on the back
surface are driven in the same phase, and an acoustic signal can be efficiently generated using
the same magnetic circuit.
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[0013]
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described
below based on the embodiments shown in the drawings.
FIG. 1 is a perspective view showing the configuration of an embodiment of the electroacoustic
transducer of the present invention.
That is, in FIG. 1, reference numeral 20 denotes a yoke formed of a flat plate-like metal material,
and both ends of the yoke 20 are each bent into a U shape to form U-shaped bent portions 21a
and 21b. .
Then, on the boundary between the central flat plate portion 22 of the yoke and the U-shaped
bent portions 21a and 21b, a pair of left and right protruding ridge portions 23a and 23b are
formed by a process of projecting in the back surface direction of the yoke In the central flat
plate portion 22 of the yoke, a plurality of rectangular holes (four in the illustrated example) are
provided at equal intervals.
[0014]
A plurality of (three in the illustrated example) rod-like magnets 25 are attached to the central
flat plate portion 22 of the yoke 20 so as to avoid the hole 24.
The magnet 25 generates magnetic flux from the N pole to the S station on both the front surface
and the back surface, that is, as shown in a cross section in FIG. The poles are arranged
alternately facing each other.
[0015]
Therefore, as shown in FIG. 3, in the top view seen from the surface, an N pole is disposed at the
center and an S pole is disposed to the left and right of the center.
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Further, as shown in FIG. 4, in the bottom view as viewed from the back side, the S pole is
disposed at the center, and the N pole is disposed to the left and right of the center.
[0016]
A diaphragm 26 made of, for example, a polyimide film, which is formed in a band shape so as to
surround the yoke 20, is stretched. That is, the starting end of the diaphragm 26 is attached to
one U-shaped bent portion 21 a of the yoke 20 by means such as adhesion. Then, the diaphragm
26 is pivoted along the other U-shaped bent portion 21b via the upper surface, ie, the surface, of
the yoke 20, and the end portion thereof is the one U-shaped bent portion via the lower surface,
ie, the back surface of the yoke 20. It is attached to 21a by means such as adhesion.
[0017]
The diaphragm portion positioned on the surface of the magnet group from the one U-shaped
bent portion 21a to the other U-shaped bent portion 21b is configured as the first diaphragm
26a, and the other U-shaped bent portion 21b A diaphragm portion located on the back surface
of the magnet group leading to the one U-shaped bent portion 21a is configured as a second
diaphragm 26b.
[0018]
In the state where the diaphragm 26 is stretched in the above-described state on the surface of
the diaphragm 26, the magnet 25 is positioned at a position crossing the magnetic flux generated
from the N pole of the magnet 25 to the S station. Conductors 27 are disposed parallel to the
longitudinal direction.
The respective conductors 27 are alternately connected to each other at both edges of the
diaphragm 26 so as to form a serpentine shape, and they are molded into one piece. FIG. 5 is a
developed view showing a pattern of the band-shaped vibrating plate 26 and a conductor 27
disposed on the surface of the vibrating plate 26. As shown in FIG.
[0019]
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Lead wires 28a and 28b are connected to both ends of the conductor 27 disposed on the surface
of the diaphragm 26, and an audio signal is applied to the conductor 27 through the lead wires
28a and 28b. Here, when an audio signal is applied to the lead wires 28a and 28b and the
current by the audio signal flows in the direction of the lead wires 28a to 28b, the current i flows
in the arrow direction in FIG. For this purpose, the conductor 27 is driven in the direction of the
arrow D in the upper part of the drawing in FIG. 3, ie in FIG. 2, according to Fleming's left-hand
rule, so that the first diaphragm 26a is also driven in the same direction. At this time, the current
i flows in the direction of the arrow in FIG. 4, and therefore the conductor 27 is driven downward
in the paper of FIG. 4, that is, in the direction of the arrow E in FIG. Therefore, the first
diaphragm 26b is also driven in the same direction.
[0020]
Therefore, the first and second diaphragms 26a and 26b are always driven in the same direction
by the audio current. The reproduction signal (sound wave) generated by the second diaphragm
26b is applied to the first diaphragm 26a in the same phase through the hole 24 formed in the
yoke 20.
[0021]
As shown in the enlarged cross-sectional view of FIG. 6, of the strip-shaped diaphragms 26
stretched around the yoke 20, the second diaphragm 26 b is projected to the back surface of the
yoke 20. The second diaphragm 26b is stretched in a state in which a clearance C of about 0.5
mm or more is secured with respect to the back surface of the yoke 23 by the pair of left and
right protrusions 23a and 23b. The presence of the clearance C drives the yoke 20 without
contacting it. Further, the U-shaped bent portions 21a and 21b forming the end portion of the
yoke 20 are bent so that the tips thereof are not in contact and the diaphragm 26 is damaged by
the vibration of the band-shaped diaphragm 26. It is extended inward enough along the arc.
[0022]
FIG. 7 is a perspective view for explaining a practical use example of the electroacoustic
transducer having the above-described configuration. The converter unit S configured as shown
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in FIG. 1 is housed in a case T provided with a plurality of sound output holes T1 on one side. In
this case, a pair of unit mounting columns T2 are established on the bottom surface of the case T,
and U-shaped bent portions 21a and 21b provided at both ends of the yoke 20 constituting the
converter unit S are the pair of unit mountings. The column T2 is fitted and positioned. With the
converter unit S housed in the case T in this manner, the lid U is attached to the upper part of the
case T.
[0023]
As apparent from the above description, according to the electroacoustic transducer of the
present invention, the conductor located on the surface of the magnet crosses the magnetic flux
generated from the N pole of the magnet to the S station. A voice current flowing in this
conductor vibrates in a direction perpendicular to the magnetic flux and drives the first
diaphragm on the surface. The conductor located on the back of the magnet is also disposed at a
position crossing the magnetic flux generated from the N pole of the magnet to the S station, and
vibrates in the direction perpendicular to the magnetic flux by the voice current flowing through
the conductor. The second diaphragm is driven in the same direction as the first diaphragm.
[0024]
As a result, the first diaphragm on the front surface and the second diaphragm on the back
surface are driven in the same phase, and an acoustic signal can be efficiently generated using a
pair of magnetic circuits.
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