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JP2004173094

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DESCRIPTION JP2004173094
The present invention provides an electro-acoustic transducer which can be thinned and cost can
be reduced, and a method of manufacturing the same. A thin substrate 2 has a vibrating portion
9 on which a conducting wire pattern 8 is formed, and a magnet 11 disposed in the vicinity of
the vibrating portion 9, and the vibrating portion 9 is the thin type. The conductive portions are
formed so that the conductive directions are opposite to each other on the inner side surfaces of
the folded portion 12 which is folded so as to make the forming surfaces of the conductive wire
pattern 8 in the substrate 2 face each other. And the wire portion 13 of the conducting wire
pattern 8 in which the lines of magnetic force of the magnet 11 are orthogonal to each other.
[Selected figure] Figure 1
Electro-acoustic transducer and method of manufacturing the same
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer and a method of manufacturing the same, and more particularly to a
vibrating portion having a conducting wire pattern formed on a thin substrate, and a vibrating
portion disposed near the vibrating portion. And a method of manufacturing the same. 2.
Description of the Related Art In recent years, in electronic devices such as digital cameras, a
configuration in which an electroacoustic transducer such as a speaker or a microphone is
mounted has been adopted. FIGS. 4 and 5 show an example of such an electro-acoustic
transducer. In the electro-acoustic transducer 1, at a predetermined position on a thin substrate
2 such as a membrane or FPC, The vibration part 4 connected to the lead-out part 3 of the
conducting wire is mounted. The vibration unit 4 is configured by incorporating a coil (not
shown) connected to the drawing unit 3 in the inside of the case 5, and a magnetic field by a
permanent magnet (not shown) is applied to the coil. It is supposed to be. Here, in the case where
the electroacoustic transducer 1 is a speaker, when a current flows as an electrical signal to the
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coil, an electromagnetic force according to Fleming's left hand acts on the current by the
magnetic field of the magnet. The vibration unit vibrates by this electromagnetic force to emit a
voice. That is, in the case of the speaker, the input electric signal is converted into sound and
output from the vibration unit. On the other hand, in the case where the electroacoustic
transducer 1 is a microphone, when a voice is input to the vibration unit from the outside and the
vibration unit is vibrated together with the coil, the number of flux linkages of magnets
penetrating the coil changes. As a result, an induced electromotive force is generated in the coil,
and the induced electromotive force generates a current. That is, in the case of a microphone, the
sound input to the vibration unit is converted into a current, that is, an electrical signal. Patent
Document 1: Japanese Patent Application Laid-Open No. 10-178697 (FIG. 1) SUMMARY OF THE
INVENTION However, the conventional electroacoustic transducer can be made thinner
according to the thickness of the vibrating portion 4. In addition, there is a problem that the
manufacturing cost becomes expensive. The present invention has been made in view of such
problems, and it is an object of the present invention to provide an electroacoustic transducer
which can be made thinner and whose cost can be reduced, and a method of manufacturing the
same. It is In order to achieve the above object, the feature of the electroacoustic transducer
according to the present invention is to provide a vibrating portion in which a conducting wire
pattern is formed on a thin substrate, and the vicinity of the vibrating portion. And a folded
portion in which the vibrating portion is folded so as to make the formation surfaces of the
conductive wire pattern on the thin substrate face each other, and both inner sides of the folded
portion facing each other. It has a point on the surface provided with the wire portion of the
conducting wire pattern which is formed such that the direction of energization is opposite to
each other and the lines of magnetic force of the magnet are orthogonal to each other.
Further, by adopting such a configuration, the vibrating portion can be formed inexpensively and
thinly by directly forming the conducting wire pattern on the thin substrate, and furthermore, in
the folded portion By applying an electromagnetic force in the opposite direction to each other
by means of a magnet on each wire portion of the conducting wire pattern formed on both inner
surfaces facing each other, the two inner surfaces are made to contact, separate or approach or
separate from each other Can be elastically deformed in the vibration direction, and as a result,
the vibrating portion can be vibrated properly. Further, the electro-acoustic transducer according
to the present invention is characterized in that a central portion of a conductor pattern formed
in a coil shape on the thin substrate such that the wire portion is formed on the thin substrate
together with the folded portion It is a point formed by being folded back. By adopting such a
configuration, the conduction directions of the respective wire portions formed on both inner
surfaces of the folded portion can be made opposite to each other by a further simple
configuration, and it is more effective. Cost reduction can be achieved. Furthermore, a feature of
the method of manufacturing an electroacoustic transducer according to the present invention is
that a vibrating portion having a conductor pattern is formed on a thin substrate, a magnet is
disposed in the vicinity of the vibrating portion, and When forming the vibrating portion, the
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conductor pattern is formed on the thin substrate so as to have a coil shape in a plan view, and
the magnet in which the thin substrate is set at the central portion of the coiled conductor
pattern At the virtual folding line orthogonal to the magnetic lines of force, the conductive
patterns are turned so that the forming surface of the conducting wire pattern is inward, so that
the conduction directions are opposite to each other on both inner surfaces facing each other at
this folding portion. And, it is in the point which forms the wire part of the said conducting-wire
pattern by which the said magnetic force line is made to be orthogonal. Further, by adopting
such a method, the vibrating portion can be formed inexpensively and thinly by folding back the
coiled conducting wire pattern formed on the thin substrate together with the thin substrate.
Further, by applying an electromagnetic force in a direction opposite to each other by a magnet
on each wire portion of the conducting wire pattern formed on both inner surfaces facing each
other of the vibrating portion, the both inner surfaces are brought into contact with each other
The folded portion can be elastically deformed in the vibration direction, and as a result, the
vibrating portion can be properly vibrated, and furthermore, a vibrating portion performing such
appropriate vibration can be simply configured.
DETAILED DESCRIPTION OF THE INVENTION Embodiments of the electroacoustic transducer
according to the present invention will be described below with reference to FIGS. 1 to 3. The
same or similar parts as in the prior art and the basic configuration will be described using the
same reference numerals. As shown in FIG. 1, the electroacoustic transducer 7 in the present
embodiment has a vibrating portion 9 in which a conductor pattern 8 is formed on a flexible thin
substrate 2 made of a membrane, an FPC or the like. doing. A magnet 11 for applying a magnetic
field to the wire pattern 8 is disposed at a position near the left side of the vibrating portion 9 in
FIG. Furthermore, in the present embodiment, the vibrating portion 9 has a folded portion 12
formed by folding the surfaces of the thin substrate 2 on which the conductor patterns 8 are
formed so as to face each other. The line portions 13 of the conductor pattern 8 in which the
lines of magnetic force of the magnets 11 are orthogonal to each other are formed on both inner
surfaces facing each other. In FIG. 1, the inner surface of the upper wall portion 12a of the folded
portion 12 and the inner surface of the lower wall portion 12b opposed thereto are each
elongated in the direction perpendicular to the sheet of FIG. The five line portions 13 are formed,
but the number of the line portions 13 may be selected as desired according to the concept.
Further, the direction of the current flowing in the line portion 13 on the upper wall portion 12a
side and the direction of the current flowing in the line portion 13 on the lower wall portion 12b
side are opposite to each other. . Further, the magnet 11 is held between the portion in the
vicinity of the wire portion 13 in the upper wall portion 12 a and the portion in the vicinity of the
wire portion 13 in the lower wall portion 12 b so as to be both wall portions. 12a and 12b are
fixed using a fixing method such as adhesion. As described above, in the present embodiment, the
conductor pattern 8 is directly patterned on the thin substrate 2 to form the vibrating portion 9,
thereby making the vibrating portion 4 as a conventional thin substrate 2. The thickness of the
vibrating portion 9 can be reduced compared to the case of mounting, and furthermore, the
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manufacturing cost can be reduced. Further, the electromagnetic force in the direction to oppose
each other by the magnet 11 according to the rule of Fleming's left hand with respect to the wire
portion 13 on the upper wall portion 12 a side and the wire portion 13 on the lower wall portion
12 b side As a result, the folded portion 12 can be elastically deformed in the vibration direction
so that the vibrating portion 9 can be properly vibrated.
Furthermore, in the present embodiment, as shown in FIG. 2, the wire portion 13 has a central
portion of a conductor pattern 8 formed on the thin substrate 2 so as to have a coil shape in a
plan view. It is formed by folding back with the thin substrate 2 at a folding line shown by a
broken line in FIG. As a result, the conduction directions of the wire portion 13 on the upper wall
12a side and the wire portion 13 on the lower wall 12b side can be made opposite to each other
by a further simple configuration, and as a result, Furthermore, the cost can be reduced
effectively. Next, the operation of this embodiment will be described. For convenience, in the
following description, the electro-acoustic transducer functions as a speaker. First, a current of a
predetermined frequency is input as an electrical signal to the conductor pattern 8 by a power
supply (not shown). Thus, first, a current toward the back of the drawing in FIG. 3 flows through
the wire portion 13 formed on the upper wall portion 12 a of the folded portion 12, and the wire
portion 13 formed on the lower wall portion 12 b The current flowing to the front side of the
paper surface in FIG. At this time, an electromagnetic force acts on the current flowing in each of
the wire portions 13 by the magnetic field of the magnet 11 which is orthogonal to each wire
portion 13 from the left in FIG. More specifically, as shown by the solid arrows in FIG. 3, with
respect to the wire portion 13 on the upper wall portion 12 a side, the electromagnetic force
directed downward is the wire portion 13 on the lower wall portion 12 b side. An upward
electromagnetic force acts on. Thereby, the inner surfaces of the upper wall portion 12a and the
lower wall portion 12a in the folded portion 12 move in the direction in which they are close to
each other, and the folded portion 12 is contracted along the vibration direction by elastic
deformation. . Next, when the direction of energization of the conductor pattern 8 is reversed, the
electromagnetic force in the upper direction with respect to the line portion 13 on the upper wall
portion 12 a side as shown by the broken arrow in FIG. However, the downward electromagnetic
force acts on the lower wall portion of the wire portion. As a result, the inner surfaces of the
upper wall 12a and the lower wall 12a in the folded portion 12 move in the direction in which
they are separated from each other, and the folded portion 12 extends along the vibration
direction by elastic deformation. As a result, the vibration unit 9 can be vibrated in the vibration
direction to output a voice. Next, an embodiment of a method of manufacturing an electroacoustic transducer according to the present invention will be described with reference to FIGS. 1
and 2.
In the present embodiment, first, a flat flexible thin substrate 2 formed in a predetermined planar
shape as shown in FIG. 2 is prepared, and a predetermined position on the thin substrate 2 (FIG.
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2) In (4), the flat rectangular coiled conductor pattern 8 is formed in the vicinity of the right end.
In FIG. 2, the conductor pattern 8 is formed so that the number of turns of the coil is five. At this
time, the portion of the wire pattern 8 which is elongated in the vertical direction in FIG. 2
becomes the wire portion 13 which receives the orthogonal magnetic field from the magnet 11.
Furthermore, the magnet 11 exerts a magnetic field in the lateral direction in FIG. 2 at a position
near the coil-shaped conducting wire pattern 8 on the thin substrate 2 (position near the left in
FIG. 2). Bonding is done via the lower end face which will be the end face on the back side. Next,
a virtual folding line indicated by a broken line in FIG. 2 is set at the central portion of the coiled
conductive pattern 8, and the thin substrate 2 is folded inward along with the conductive pattern
8 at this folding line. Thereby, as shown in FIG. 1, the line portions 13 where the magnetic lines
of force of the magnet 11 are orthogonal are formed respectively on both inner surfaces of the
upper wall portion 12a and the lower wall portion 12b of the folded back portion 12 facing each
other. Be done. Finally, the inner surface of the folded back upper wall 12a of the thin substrate
2 is bonded to the upper end surface which is the end surface on the front side of the drawing
sheet of FIG. As described above, in the present embodiment, it is possible to simply and
inexpensively manufacture a thin electroacoustic transducer excellent in performance. The
present invention is not limited to the above embodiment, and various modifications can be made
as necessary. For example, in the above embodiment, a speaker is mentioned as an example of
the electroacoustic transducer, but the present invention is also applicable to a microphone. As
described above, according to the electroacoustic transducer pertaining to the present invention,
a thin electroacoustic transducer can be manufactured at low cost. Further, according to the
electro-acoustic transducer pertaining to the present invention, an electrical signal can be
properly converted to voice, and such an electro-acoustic transducer can be easily manufactured.
Furthermore, according to the method of manufacturing an electro-acoustic transducer according
to the present invention, a thin electro-acoustic transducer can be manufactured inexpensively,
and an electrical signal can be properly converted into sound. Furthermore, such a high quality
electroacoustic transducer can be manufactured more inexpensively.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view showing an embodiment
of an electroacoustic transducer according to the present invention and a method of
manufacturing the same. FIG. 2 an embodiment of an electroacoustic transducer according to the
present invention and a method of manufacturing the same. FIG. 3 is a plan view showing a thin
substrate before being folded, a conductor pattern and a magnet disposed on the folded
substrate. FIG. 3 shows an embodiment of the electroacoustic transducer according to the
present invention when the conductor pattern is energized. Diagram showing the state of
electromagnetic force acting on the wire portion [FIG. 4] A plan view showing an example of an
electro-acoustic transducer which has been adopted conventionally [FIG. 5] Side view of FIG.
DESCRIPTION OF SYMBOLS 7 Electro-acoustic transducer 8 Conductor pattern 9 Vibrating part
11 Magnet 12 Folded part 12a Upper wall part 12b Lower wall part 13 Wire part
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