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JP2004173093

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DESCRIPTION JP2004173093
The present invention provides an electro-acoustic transducer which can be made thinner and
whose cost can be reduced. A vibrating portion (9) having a conducting wire pattern (8) formed
on a thin substrate (2), and a magnet (10) disposed so that magnetic lines of force are orthogonal
to at least a part of the conducting wire pattern (8). , 11 and. [Selected figure] Figure 1
Electro-acoustic transducer
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer, and more particularly to an electroacoustic transducer having a
vibrating portion and a magnet on a thin substrate. 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. 3 and 4 show
an example of such an electro-acoustic transducer, and the electro-acoustic transducer 1 is a
conductive wire at a predetermined position on a thin substrate 2 such as a membrane or FPC.
The vibration unit 4 connected to the routing unit 3 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 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
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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, in the conventional electro-acoustic
transducer, it is thin according to the thickness of the vibrating portion 4 In addition, there is a
problem that the manufacturing cost is increased. The present invention has been made in view
of such problems, and it is an object of the present invention to provide an electro-acoustic
transducer which can be made thinner and whose cost can be reduced. . 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 above-mentioned vibrating portion. And at least a part of the conductor pattern, the
magnet disposed so as to be orthogonal to the magnetic field lines.
Further, by adopting such a configuration, by directly forming the conducting wire pattern on the
thin substrate, the vibrating portion can be formed inexpensively and thinly. Further, the electroacoustic transducer according to the present invention is characterized in that the conductor
pattern is formed in a coil shape having a predetermined number of turns in a plane shape.
Further, by adopting such a configuration, when the electroacoustic transducer is a speaker, the
electromagnetic force to be exerted on the conducting wire pattern in the energized state can be
increased by the magnet, and the vibrating portion can be made more efficient. When the
electroacoustic transducer is a microphone, it can increase the induced electromotive force
generated in the wire pattern by electromagnetic induction when the vibrating portion vibrates
by receiving an external voice. , Voice can be more properly converted to an electrical signal.
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an electroacoustic
transducer according to the present invention will be described below with reference to FIGS. 1
and 2. FIG. 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 electro-acoustic transducer
7 in this embodiment comprises a vibrating portion 9 in which a conducting wire pattern 8 is
directly formed on a flexible thin substrate 2 made of a membrane, an FPC or the like. Have. The
conductor pattern 8 is formed in a square coil shape having a predetermined number of turns in
plan view. In addition, in FIG. 1, although the conducting-wire pattern 8 is formed so that the
number of turns of a coil may be 5 times, the number of turns of a coil can be variously changed
according to a concept. A pair of magnets 10 and 11 are disposed near the left and right outer
sides of the conductor pattern 8 in FIG. 1, and the pair of magnets 10 and 11 are arranged in the
longitudinal direction of FIG. The magnetic field orthogonal to the inward direction of the
conductor pattern 8 is applied to the plurality of long wire portions 13. Therefore, when the
electro-acoustic transducer 7 is a speaker, by energizing the conductor pattern 8, the upward or
downward electromagnetic force in FIG. 2 is exerted on the wire portion 13 according to
Fleming's left-hand rule. It can be made to When the electroacoustic transducer 7 is a
microphone, the number of magnetic flux linkages penetrating the conductor pattern 8 is
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changed by vibration of the vibrating portion 9 upon receiving voice from the outside, whereby
the conductor pattern 8 is formed. It is possible to generate an induced electromotive force and
convert it into a current as an electrical signal.
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 manufacturing cost can be reduced. Furthermore,
by forming the conducting wire pattern 8 in a coil shape having a predetermined number of
turns as described above, when the electroacoustic transducer is a speaker, the magnet 10 and
11 exert on the conducting wire pattern 8 in an energized state. The force can be increased, and
the vibrating portion 9 can be vibrated more efficiently. Further, even when the electroacoustic
transducer 7 is a microphone, the induced electromotive force generated in the conductor
pattern 8 by electromagnetic induction can be increased when the vibrating portion 9 vibrates in
response to an external voice. , Sound can be more properly converted to electrical signals. Next,
the operation of the present embodiment will be described. For convenience, in the following
description, the electroacoustic transducer 7 is made to function as a speaker. First, an
alternating current having a predetermined frequency is input as an electrical signal to the
conductor pattern 8 by a power supply (not shown). Thus, first, as shown in FIG. 2, an electric
current directed to the back side of the drawing is applied to each of the wire portions 13
positioned on the right side of FIG. 2 across the opening 8 a in the central portion of the coiled
conductor pattern 8. The current flows toward the front side of the drawing sheet of FIG. 2
through the lines 13 located on the left side. Then, an electromagnetic force acts on the current
flowing through each of the wire portions 13 by the magnetic field of the magnets 10 and 11
orthogonal to each of the wire portions 13 from the left or right in FIG. More specifically, as
shown by the arrows in FIG. 2, an upward electromagnetic force acts on each line portion 13
according to Fleming's left-hand rule. Thus, the vibrating portion 9 on which the conductor
pattern 8 is formed is elastically deformed so as to be warped upward with the conductor pattern
8 by the electromagnetic force. Next, when the conduction direction of the conductor pattern 8 is
reversed, a downward electromagnetic force is applied to each wire portion 13 to cause the
vibrating portion 9 to bow downward. To be elastically deformed. As a result, the vibration unit 9
can be vibrated in the vibration direction to output a voice.
In the present embodiment, by forming the conductor pattern 8 in a coil shape of a
predetermined number of turns and arranging a plurality of wire portions 13 in parallel, the
electromagnetic force acting on the vibrating portion 9 is increased. As a result, the vibrating
portion 9 can be vibrated more properly to obtain a good sound. The present invention is not
limited to the above embodiment, and various modifications can be made as necessary. For
example, although the magnets 10 and 11 are disposed in the vicinity of the outer side of the
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coiled conductor pattern 8 in the above embodiment, the present invention is not limited to this.
It may be arranged in the inner vicinity position of. Further, 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 into sound, and sound can be properly converted into
an electric signal. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic plan view
showing an embodiment of the electro-acoustic transducer according to the present invention.
FIG. 2 is a side view of FIG. 1 FIG. 3 a conventionally adopted electro-acoustic transducer 4 is a
schematic plan view showing an example of the present invention. [FIG. 4] Side view of FIG. 3
[Description of reference numerals] 2 thin substrate 7 electroacoustic transducer 8 conductor
pattern 9 vibration unit 10, 11 magnet 13 wire portion
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