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JP2002336776

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DESCRIPTION JP2002336776
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a
mobile communication device represented by a mobile phone, and includes a vibration actuator
having a function of generating a ringing tone, voice and vibration, a portable video game, a
notebook personal computer, etc. Relates to a micro speaker used in
[0002]
2. Description of the Related Art The spread of mobile phones in recent years is remarkable. Such
a device is desired to be as small and light as possible and to consume less power in
consideration of convenience. One of the parts corresponding to the demand is a multifunctional
vibration actuator.
[0003]
In conventional mobile phones, there has been a method of rotating an electric motor inside the
mobile phone and transmitting an incoming call by mechanical vibration as a means for
transmitting an incoming call regardless of the ringing tone. However, when the motor is used,
the miniaturization of the casing of the mobile phone is hindered, and it is difficult to suppress
the increase of the power consumption, so there is a problem that the charging interval is
shortened.
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[0004]
A multifunctional vibration actuator has been developed as a measure against this, and adds a
vibration function, that is, an incoming transmission function by mechanical vibration to a
speaker, and is becoming mainstream in mobile phones and the like. In addition, even in portable
video games and notebook personal computers, microspeakers having the same structure are
often used.
[0005]
FIG. 3 is a cross-sectional view of an example of such a vibration actuator. In this example, a
magnetic circuit is formed by the yoke 303 and the plate 304 so as to sandwich the annular
permanent magnet 305, which is an internal magnet type structure. The flexible suspension 307
is fixed to the vibration transmission unit 308 so that the magnetic circuit itself can vibrate.
[0006]
A central shaft 306 having a shape such as a bolt or a pin is inserted through a central hole
provided in each component constituting the magnetic circuit, and the yoke 303, the permanent
magnet 305, and the plate 304 are integrated to be coaxial It is positioned at The coil 302 is
fixed to the diaphragm 301 with an adhesive or the like, and is disposed in an annular gap of the
magnetic circuit, and the diaphragm 301 is fixed to the vibration transmission unit 308.
[0007]
With such a configuration, the vibration actuator vibrates the magnetic circuit itself to output a
vibration signal or vibrates the diaphragm to output a ringing tone or a speech according to the
frequency of the input signal. be able to.
[0008]
However, in the above-described vibration actuator and micro speaker, the reproducible
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frequency band is limited to several kHz at the high frequency side.
Even in this frequency band, there are no particular problems in applications such as ringtones
and calls in cellular phones. However, when music can be distributed by a mobile phone as in
recent years, this characteristic is insufficient. For example, in a music CD, data in a frequency
band of 20 Hz to 20 kHz is recorded, and the playback apparatus is also required to cope with
this frequency band.
[0009]
Accordingly, the technical problem of the present invention is that, in the above-described
vibration actuator and microspeaker, a reproducible frequency band while suppressing an
increase in size of a device accompanying a complication of the structure, In particular, the
purpose is to expand the high band side and to provide a characteristic that can sufficiently
withstand music appreciation.
[0010]
SUMMARY OF THE INVENTION The present invention is made as a result of reviewing the
structure of a diaphragm in order to solve the above-mentioned problems.
[0011]
That is, according to the present invention, there is provided a magnetic circuit including a
permanent magnet fixed to a vibration transmitting portion in a vibrating state by a flexible
suspension, a coil disposed in an air gap of the magnetic circuit, the coil and the vibration
transmitting portion In the vibration actuator in which the vibration plate is fixed and capable of
vibration output, a sub cone is disposed on the vibration plate.
[0012]
In the vibration actuator of the present invention, the sub-cone is disposed on the diaphragm,
and the operating frequency band of the sub-cone can be 5 kHz to 15 kHz. It can be expanded.
[0013]
Examples of the material of the sub-cone include polymeric materials such as polypropylene and
polyethylene terephthalate, metallic materials such as aluminum, paper, nonwoven fabrics of
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pulp fibers, impregnated with thermosetting polymer materials, and cured. Depending on the
characteristics required.
Moreover, after shaping | molding the material of an organic type, what provided the coating
layer of the metal by the sputtering method etc. on the surface can also be used.
[0014]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the present
invention will be described based on the drawings.
[0015]
FIG. 1 is a cross-sectional view of an example of a vibration actuator according to an embodiment
of the present invention.
This example has the same basic configuration as the conventional vibration actuator shown in
FIG. 3, and a magnetic circuit is formed by the yoke 103 and the plate 104 so as to sandwich the
annular permanent magnet 105. It has a magnetic structure.
A central shaft 106 having a shape such as a bolt or a pin is inserted through a central hole
provided in each component constituting the magnetic circuit, and the yoke 103, the permanent
magnet 105, and the plate 104 are integrated to be coaxial It is positioned at
The coil 102 is fixed to the diaphragm 101 with an adhesive or the like, and disposed in an
annular gap of the magnetic circuit.
[0016]
The sub cone 109 is disposed and fixed at the center of the diaphragm so as to be concentric
with the diaphragm.
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The material of the subcone in this example is polyethylene terephthalate. FIG. 2 is a view
showing the shape of the sub-cone, FIG. 2 (a) is a front view, and FIG. 2 (b) is a cross-sectional
view. In this example, by providing the sub-cone, the reproducible frequency band could be up to
15 kHz.
[0017]
As described above, according to the present invention, it is possible to greatly expand the
reproducible frequency band of the vibration actuator and the microspeaker used for portable
communication devices and the like. It can contribute to the application expansion of the device
and the improvement of the convenience.
[0018]
Brief description of the drawings
[0019]
1 is a cross-sectional view showing an example of a vibration actuator according to an
embodiment of the present invention.
[0020]
2 is a diagram showing an example of a sub-cone used in the present invention, FIG. 2 (a) is a
front view, FIG. 2 (b) is a cross-sectional view.
[0021]
3 is a cross-sectional view showing an example of a conventional vibration actuator.
[0022]
Explanation of sign
[0023]
101, 301 Vibration plate 102, 302 Coil 103, 303 Yoke 104, 304 Plate 105, 305 Permanent
magnet 106, 306 Central axis 107, 307 Suspension 108, 308 Vibration transmission part 109
Sub cone
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