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JP2006042110

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DESCRIPTION JP2006042110
The present invention relates to a sound generating apparatus used for information
communication equipment, etc., which solves the problem of no mounting space due to the
downsizing and thinning of the equipment, and is small, thin and high-performance capable of
flexibly dealing with a limited space. It aims at providing a sound reproduction device. A sound
generator mounted on an electronic device comprising: a main body having a substrate on which
main components are incorporated; and an exterior portion containing the main body, the
acoustic generator comprising: The speaker's design freedom is expanded by the configuration
consisting of the vibration unit for sound generation and the drive unit provided on the main unit
to drive the vibration unit and facing the vibration unit. This makes it possible to flexibly attach
to a limited small mounting space such as a cellular phone, etc., and simultaneously achieves cost
reduction and size and weight reduction by eliminating a frame for constituting a speaker. be
able to. [Selected figure] Figure 1
Acoustic generator, electronic apparatus equipped with the acoustic generator, and apparatus
[0001]
The present invention relates to an acoustic generator used for various audio equipment, video
equipment, information communication equipment, etc., and an electronic equipment and
apparatus equipped with this acoustic generator, and in particular, it is miniaturized, thinned, and
multifunctionalized. The present invention relates to a small and thin acoustic generator that is
effective for devices and devices that have limited installation space.
[0002]
FIG. 7 is a cross-sectional view showing a configuration of a speaker which is a conventional
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sound generating device.
[0003]
In FIG. 7, 1 is a magnet, 2 and 3 are an upper plate and a yoke joined so as to sandwich the
magnet 1 from above and below, thereby forming an inner magnetic type magnetic circuit 4 in
which an annular magnetic gap 5 is formed. It is what you are configuring.
[0004]
6 is a frame coupled to the magnetic circuit at the center, 8 is a voice coil movably fitted in the
magnetic gap 5, and 7 is coupled to the voice coil 8 at the center and the outer peripheral
portion is on the periphery of the frame 6. It is a combined diaphragm.
[0005]
And 9 is a protective cover for protecting this diaphragm 7.
[0006]
In the conventional speaker configured as described above, the voice coil 8 drives the inside of
the magnetic gap 5 up and down by inputting an electric signal to the voice coil 8, whereby the
diaphragm 7 coupled to the voice coil 8 is produced. Is configured to perform acoustic
reproduction with amplitude.
[0007]
As prior art document information related to the invention of this application, for example,
Patent Document 1 and Patent Document 2 are known.
JP, 2004-56278, A JP, 2002-78082, A
[0008]
However, in the case of a speaker, which is the above-mentioned conventional sound generating
device, when it is mounted on a product which is rapidly becoming smaller, thinner and
multifunctional, the space for attaching the speaker becomes extremely small and the
miniaturization of the speaker follows There was a problem that it was impossible.
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[0009]
In particular, in mobile phones that are information terminals, multi-functionalization is
progressing at a remarkable speed far beyond forecasting beyond the efforts of downsizing and
thinning, and for this reason a large number of new parts that have never been available are
loaded As a matter of fact, there is also a problem that there is no space for mounting the
speaker in the extreme case.
[0010]
Therefore, in such a situation, the conventionally configured speaker has a large problem that it
can not be mounted at the bottom of the speaker mounting gap that is allowed for the mobile
phone.
[0011]
An object of the present invention is to solve such a conventional problem and to provide a smallsized, thin, high-performance sound reproducing apparatus that can flexibly cope with a limited
small mounting space. It is a thing.
[0012]
In order to solve the above-mentioned problems, the present invention provides a sound
generator mounted on an electronic device comprising at least a main body into which main
parts are incorporated, and an outer cover accommodating the main body, the part of the outer
cover The vibration unit includes a vibration plate for generating sound, and a drive unit for
driving the vibration unit is disposed on the main body unit so as to face the vibration unit.
[0013]
As described above, the sound generating apparatus according to the present invention is
represented by a mobile phone, since the vibration unit and the drive unit for driving the same
are separated and the design freedom of the speaker is expanded to facilitate miniaturization. It
can be flexibly attached to a limited small mounting space such as a small information terminal,
and the cost reduction and the size and weight reduction can be simultaneously achieved by
eliminating the frame for constituting the speaker. The special effect is obtained.
[0014]
(First Embodiment) In the following, particularly with reference to the first embodiment, claims 1
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to 5 and claims 7 to 8 of the present invention, and claims 10 to 11 and claim 14 The invention
according to claim 16 will be described.
[0015]
FIG. 1 is a cross-sectional view showing the configuration of the sound generation apparatus
according to the first embodiment of the present invention, and shows a mobile phone which is
an information terminal as an electronic device.
[0016]
In FIG. 1, 80 is a mobile phone, 70 is an outer case of the mobile phone, 40 is a substrate
incorporated in the outer case 70, 41 is an electronic component mounted on the substrate, 50 is
an operation unit of the mobile phone, 60 Is a display unit of a mobile phone such as a liquid
crystal panel.
[0017]
Reference numeral 27 denotes a diaphragm serving as a vibrating portion provided in a part of
the outer case 70, and reference numeral 28 denotes a voice coil coupled to the back surface of
the diaphragm 27.
As described above, the vibrating portion is configured by at least the diaphragm 27 and the
voice coil 28 coupled to the diaphragm 27.
[0018]
Reference numeral 24 denotes a magnetic circuit as a magnetic flux generating means serving as
a drive unit provided on the substrate 40, 21 denotes a magnet, 22 denotes a plate, and 23
denotes a yoke. A magnetic circuit 24 having a gap 25 is formed, and the magnetic gap 25 is
disposed to face the voice coil 28 coupled to the diaphragm 27.
[0019]
The sound generation apparatus according to the present embodiment configured as described
above eliminates the frame of the original sound generation apparatus and separates the
vibration unit and the drive unit for driving the sound generation apparatus. The degree of
freedom in the design of can be expanded.
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[0020]
And because the design can be made smaller and thinner easily by expanding the degree of
freedom in design, it can be mounted flexibly in response to the limited small mounting space of
mobile phones and other small information terminals as electronic devices. It becomes possible.
[0021]
Furthermore, cost reduction and size and weight reduction can be achieved simultaneously by
eliminating the frame for constituting the speaker.
[0022]
Further, in the above configuration, since the vibration unit and the drive unit are not coupled to
each other without providing a frame to constitute the sound generating apparatus, the vibration
unit and the drive unit can be assembled separately and independently. A manufacturing method
different from the conventional speaker manufacturing method is possible.
[0023]
Therefore, this configuration includes the manufacturing process of the vibration unit and the
driving unit in the manufacturing process of the main body unit in which the main parts are
incorporated and the manufacturing process of the exterior unit housing the main body unit
without providing the conventional speaker. By manufacturing it, an acoustic generator can be
easily comprised.
[0024]
For this reason, it is possible to reduce the unit cost of the speaker, the management cost thereof,
and the physical distribution cost of the speaker, and the like, and a great cost reduction can be
achieved.
[0025]
In addition, since the vibration part and the drive part are in the non-coupled state, the
occurrence of the magnetic gap failure in which the voice coil contacts the magnetic gap as in the
conventional speaker is not generated.
[0026]
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In addition, the material of the diaphragm 27 can be made of resin material to realize weight
reduction and good shape moldability, and the sound pressure level of the sound generating
device can be improved and the characteristics can be improved. Performance can be improved.
[0027]
On the other hand, the material of the diaphragm 27 can also be formed of a metal material, and
by using a lightweight and highly rigid material such as aluminum, titanium, duralumin, etc.,
strength improvement as a diaphragm and high frequency limit frequency It is possible to
improve the characteristics, such as the elongation of
[0028]
Furthermore, as shown in FIG. 2, when the resin material is formed by injection molding, the
voice coil 28 is inserted and formed, whereby the adhesion between the diaphragm 27 and the
voice coil 28 becomes unnecessary, and the insertion is further performed. Therefore, the
detachment of the diaphragm 27 and the voice coil 28 can be prevented.
[0029]
In addition, the magnetic circuit 24 serving as the drive unit is coupled to the substrate 40 of the
main body unit, so that the magnetic flux generated by the magnetic circuit 24 efficiently acts on
the voice coil 28. 27 and the voice coil 28 can be accurately disposed facing each other without
occurrence of positional deviation.
Also, the manufacturing process can be shortened and rationalized, and the cost can be reduced
significantly by reducing the number of processes.
[0030]
Moreover, about the voice coil 28, although the above-mentioned embodiment demonstrated the
example comprised with the metal wire which has an insulation film, ie, a magnet wire, use of
metal foil is not limited to this embodiment. Alternatively, it may be formed by conductive ink.
[0031]
With these configurations, in the case of using a metal foil, further thinning can be achieved, and
in the case of using a conductive ink, the degree of freedom of the shape of the voice coil 28 can
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be improved along with thinning.
[0032]
As described above, the sound generating apparatus according to the present invention has
shown a state in which a signal of a frequency band in which sound is generated, that is, a signal
of a frequency band of 20 Hz to 20 KHz is inputted and used as the input signal.
[0033]
The present invention is not limited to this method of use, and can be used not only as a sound
generator but also as a vibration generator.
[0034]
That is, by inputting a low frequency current to the above-described sound generation device of
the present invention, it can also be used as a vibration generation device.
The low frequency current for generating the vibration can be realized by inputting and using a
signal of a frequency band of about 1 Hz to about 300 Hz.
[0035]
As a result, application and development to the calling function and the like by the vibrator of the
mobile phone become possible.
[0036]
Therefore, the configuration according to the present invention can provide an acoustic
generating device and a vibration generating device which can be flexibly and flexibly attached
even to a limited small mounting space by expanding design freedom. It is possible to reduce the
size and thickness of a mobile phone or the like that is an information terminal as an apparatus.
[0037]
Furthermore, by eliminating the frame for constituting the speaker, it is possible to
simultaneously reduce the number of parts and the number of manufacturing steps, and to
reduce the size and weight, thereby achieving cost reduction.
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[0038]
Second Embodiment The invention according to the sixth aspect of the present invention will be
described below with reference to a second embodiment.
[0039]
The present embodiment is different from the first embodiment in the configuration of the drive
unit of the sound generation apparatus, and the other configuration is the same as that of the
first embodiment, and the same reference numerals are given to the same portions. The detailed
description thereof will be omitted, and only different portions will be described below with
reference to the drawings.
[0040]
FIG. 3 is a cross-sectional view showing the configuration of the sound generation apparatus
according to Embodiment 2 of the present invention.
[0041]
Reference numeral 29 denotes an induction magnetic field generating coil serving as a drive unit
provided on the substrate 40, which is disposed to face the voice coil 28 coupled to the
diaphragm 27.
[0042]
The sound generator according to the present embodiment configured as described above has
the effects shown in the first embodiment, and can be thinner than the first embodiment because
there is no magnetic circuit.
[0043]
The induction magnetic field generating coil 29 may be disposed on the substrate 40 or may be
disposed inside the substrate 40 as shown in FIG.
As described above, in the case of being disposed inside the substrate 40, the thickness can be
further reduced.
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[0044]
Third Embodiment The invention according to the twelfth and thirteenth aspects of the present
invention will be described below with reference to a third embodiment.
[0045]
In the present embodiment, the sound generator according to the first embodiment is provided
with a protective cover. The other configuration is the same as that of the first embodiment, and
the same reference numerals are given to the same parts. The detailed description is omitted and
only different parts are described below with reference to the drawings.
[0046]
FIG. 4 is a cross-sectional view showing a configuration in which a protective cover is provided to
the sound generation device according to Embodiment 3 of the present invention, and FIG. 5 is a
cross-sectional view in which the protective cover is provided integrally with the exterior portion
of the sound generation device.
[0047]
In FIGS. 4 and 5, 71 is a protective cover, 70A is a protective cover formed integrally with the
outer case, and protects the outer surface of the vibration generating portion for sound
generation provided on a part of the outer case. As described above, a hole is provided so as to
cover the outer surface of the diaphragm 27 so that the sound generated from the diaphragm 27
is emitted.
[0048]
The sound generator according to the present embodiment configured as described above can
protect the vibrating portion having the diaphragm 27 and improve the safety and reliability in
use.
[0049]
In addition, when the protective cover is formed integrally with the exterior portion, the
detachment of the exterior portion and the protective cover can be further prevented, and the
reliability can be further improved, and the number of parts and the number of manufacturing
steps can be reduced. Cost reduction can also be achieved.
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[0050]
Fourth Embodiment The fourth embodiment of the present invention will be described in the
following.
[0051]
In the present embodiment, the moving device is configured by mounting the sound generating
device or the vibration generating device described in the above embodiment.
[0052]
FIG. 6 is a cross-sectional view of an automobile showing the configuration of a mobile apparatus
according to a fourth embodiment of the present invention.
[0053]
As shown in FIG. 6, 90 is a car body of an automobile, and 35 is a sound generator mounted on
the ceiling of the automobile.
[0054]
Since the mobile apparatus according to the present embodiment configured as described above
is equipped with the compact, thin, and lightweight acoustic generator 35, the mounting layout
of the acoustic generator 35 on the automobile 90 is free. As a result, the size and thickness of
the automobile 90 can be reduced.
[0055]
Furthermore, the reduction in weight can realize fuel saving of the automobile 90, and can also
make it possible to cope with global environmental protection.
[0056]
As for the mounting layout of the sound generation device 35 on the automobile 90, although
the example of mounting on the ceiling requiring thinning has been described, the present
invention is not limited to this, and the navigation system and these are mounted. There is no
need to select the mounting location, as long as the front part, the door part, the pillar part, the
rear tray part, etc. can be attached.
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[0057]
The sound generating apparatus according to the present invention can be flexibly attached to a
limited small mounting space because the degree of freedom in design is expanded to facilitate
downsizing and thinning, and a speaker can be provided. There is an effect that cost reduction
and reduction in size and weight can be simultaneously achieved by eliminating the frame to be
configured, and it is useful as an acoustic generation device such as an electronic device
represented by a mobile phone.
[0058]
Sectional view showing the configuration of the sound generation apparatus according to
Embodiment 1 of the present invention Sectional view showing the configuration of the sound
generation apparatus according to Embodiment 1 of the present invention The configuration of
the sound generation apparatus according to Embodiment 2 of the present invention Crosssectional view shown Cross-sectional view showing the configuration of the sound generation
apparatus according to the third embodiment of the present invention Cross-sectional view
showing the configuration of the sound generation apparatus according to the third embodiment
of the present invention Sound generation according to the fourth embodiment Sectional view of
a mobile device on which the device is mounted Cross-sectional view showing the configuration
of a conventional speaker
Explanation of sign
[0059]
Reference Signs List 1 magnet 2 plate 3 yoke 4 magnetic circuit 5 magnetic gap 6 frame 7
diaphragm 8 voice coil 9 protective cover 21 magnet 22 plate 23 yoke 24 magnetic circuit 25
magnetic gap 27 diaphragm 28 voice coil 29 coil for induction magnetic field generation 35
sound generation Device 40 PCB 41 Electronic component 50 Operation part 60 Display part 70
Exterior case 70A Protective cover 71 Protective cover 80 Mobile phone 90 Automobile
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