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JP2014197854

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DESCRIPTION JP2014197854
Abstract: The present invention provides an electronic device provided with a sound reproducing
device capable of sound reproduction covering a wide frequency band and excellent in frequency
characteristics, and a sound reproducing method for reproducing sound using such an electronic
device. Do. A pair of microspeakers (23) is mounted on an upper case (21) and a vibration
actuator (13) is mounted on a lower case (11) of a foldable electronic device (10). Both play the
sound. The vibration actuator vibrates the lower housing and the outer housing to complement
the acoustic characteristics of the microspeaker particularly in the low frequency range. Further,
in the case of reproducing the sound using the mobile terminal device constituting the electronic
device, the mobile terminal device is mounted on the external housing 32, the charging device or
the cradle to reproduce the sound. [Selected figure] Figure 1
Electronic device and sound reproduction method
[0001]
The present invention relates to an electronic device and an acoustic reproduction method, and
more particularly to a small electronic device equipped with a small acoustic reproduction device
having excellent frequency characteristics, and an acoustic reproduction method using such a
small electronic device.
[0002]
Generally, a portable terminal device such as a portable telephone has a small size of its housing,
so by mounting an electromagnetic microspeaker or a piezoelectric microspeaker having a
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diameter of 2 cm or less as a speaker, sound such as voice or music can be obtained. I am
playing.
For example, Patent Document 1 and Patent Document 2 disclose such a speaker as a mobile
phone. Moreover, the speaker unit which mounted the vibration actuator is disclosed by patent
document 3, and the vibration actuator is disclosed by patent document 4 and 5. FIG.
[0003]
JP 2003-198680 JP JP 11-191795 JP JP 2004-23431 JP JP 2000-343035 JP JP 2001-62396
JP
[0004]
However, in the microspeaker mounted on a small electronic device such as a portable telephone,
the sound emission area is small, and hence the volume exclusion amount due to vibration is
small, so there is a problem that sound reproduction at large volume is difficult.
Further, in the micro speaker, since the drop in acoustic radiation impedance in the low
frequency region is remarkable, the problem is that the sound reproduction performance is low
in the frequency range from several tens Hz to 1 kHz, for example There is a point. Therefore, in
such a small electronic device, in order to perform sound reproduction with a sense of volume, it
is an issue to improve the frequency characteristics of the micro speaker.
[0005]
The object of the present invention is to provide an electronic device equipped with a sound
reproducing device capable of reproducing sound and covering frequency bands wider than that
of the prior art, and a method of reproducing sound using such an electronic device. To provide.
[0006]
An electronic device according to the present invention includes a speaker, and a first acoustic
output unit that outputs sound based on an electrical signal, a vibration actuator that converts
the electrical signal into vibration, and a structural member driven by the vibration actuator. A
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second sound output unit configured to output a sound having a frequency lower than that of the
sound output from the first sound output unit; and a user provided on the structural member for
direct operation input And the vibration actuator drives the structural member in conjunction
with an operation input to the input unit or an operation of its own device.
This facilitates key input and confirmation at the time of calling.
[0007]
In the electronic device of the present invention, the type of the speaker may be any type, for
example, any of an electromagnetic type, a piezoelectric type or an electrostatic type speaker.
Also, the vibration actuator may be of any type, for example, an electromagnetic, piezoelectric or
electrostatic actuator. Examples of the electronic device of the present invention include portable
electronic devices such as mobile phone terminals and PDAs.
[0008]
The structural member is preferably, for example, a plate material that constitutes a part of a
housing, and may be another member as long as it is integrated with the housing.
[0009]
Furthermore, for example, the first acoustic output unit has a high pass filter connected to the
signal input side, and the second acoustic output unit is connected to the signal input side and is
equivalent to the cutoff frequency of the high pass filter. And a low pass filter having a cutoff
frequency of
The first sound output unit composed of the speaker has good characteristics on the high
frequency side (for example, 1 kHz or more) of the audio frequency, and the second sound output
unit composed of the vibration actuator has the low frequency side of the audio frequency ( For
example, since they have good characteristics at 1 kHz or less, by combining the both, good
sound reproduction can be achieved in a wide frequency range.
[0010]
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Furthermore, the electronic device of the present invention preferably includes a drive unit for
driving the second sound output unit in conjunction with, for example, a key input or in response
to a call signal of a telephone. This facilitates key input and confirmation at the time of calling.
[0011]
Such an electronic device is, for example, incorporated in a portable terminal device. Then, the
portable terminal device has first and second housing portions rotatably coupled to each other,
and the first sound output unit is disposed in the first housing portion, Preferably, a second
sound output unit is disposed in the second housing portion.
[0012]
Further, a sound reproducing method according to the present invention is a method for
reproducing sound using a mobile terminal device constituting an electronic device according to
the present invention, wherein the mobile terminal device is used as an external housing, a
charging device or a cradle. It is characterized in that it is mounted to reproduce sound.
[0013]
The electronic device according to the present invention is preferably applied to a small-sized
mobile terminal device, and in this case, the electronic device is mounted on an external casing
that easily vibrates, a charging device, or a cradle to make sound. It is preferable to regenerate.
[0014]
In the electronic device and the sound reproduction method of the present invention, since both
the first and second sound output units have different frequency characteristics that can be
complemented with each other, good sound reproduction can be performed in a wide frequency
range when sound is reproduced. Is possible.
[0015]
FIG. 1 is a perspective view of an electronic device having a sound reproduction device according
to a first embodiment of the present invention.
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FIG. 2 is a perspective view showing the electronic device of FIG. 1 in an expanded state
excluding its lower housing part.
It is a graph which shows the sound pressure characteristic at the time of reproducing |
regenerating audio | voice with the electronic device of FIG.
FIG. 7 is a perspective view of an electronic device having a sound reproduction device according
to a second embodiment of the present invention. FIG. 10 is a perspective view showing an
electronic apparatus having a sound reproduction device according to a third embodiment of the
present invention installed on a cradle. It is a block diagram of an electronic device which has a
sound reproduction device concerning a 4th embodiment of the present invention. It is a graph
which shows the cut-off characteristic of the filter in the sound reproduction apparatus of FIG. It
is a perspective view of the electronic device which concerns on the modification of embodiment
of FIG.
[0016]
Hereinafter, preferred embodiments of the present invention will be specifically described with
reference to the attached drawings. FIG. 1 shows a mobile phone terminal 10 which is an
electronic apparatus equipped with the sound reproducing apparatus according to the first
embodiment of the present invention. The mobile phone terminal 10 has a two-folded housing
structure, and is composed of a lower housing 11 on which the keyboard 12 is mounted and an
upper housing 21 on which the display device 22 is mounted. Both housings 11 and 21 are
connected by a hinge 31. A pair of microspeakers 23 constituting a first acoustic (voice) output
unit is mounted on the upper housing 21, and a vibration actuator 13 constituting a second
acoustic output unit is mounted on the lower housing 11. Be done.
[0017]
The microspeaker 23 is an electromagnetic, piezoelectric or electrostatic microspeaker as in the
prior art, and when the two cases 11 and 21 are opened by the hinges 31, the microspeaker 23
is a speaker on the front side of the upper case 21. It is arranged so that the front comes. The
vibration actuator 13 may be an actuator having an arbitrary vibration mechanism, but a
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piezoelectric element is preferably selected. In the case where music or the like is reproduced by
the mobile phone terminal 10, the lower housing 11 is disposed on a flat plate 32 such as a desk
or a box as shown in FIG. It is preferable to increase the area.
[0018]
FIG. 2 is a development view showing the mobile phone terminal 10 of FIG. 1 in a state in which
the front side housing portion of the lower housing 11 is removed. Inside the lower housing 11, a
substrate 14 on which various electronic components, semiconductor devices, batteries and the
like are mounted, and a vibration actuator 13 are fixed to a housing portion on the back side of
the lower housing 11. The vibration actuator 13 extends along the side of the lower housing 11
adjacent to the hinge 31 and is attached to a panel portion on the back side of the lower housing
11. The micro-speakers 23 are arranged in pairs on both sides near the hinges 31 of the upper
housing 21.
[0019]
FIG. 3 is a graph showing the results of measurement of the frequency characteristics of the
sound in the mobile phone terminal 10 in the state of FIG. 1. The frequency (Hz) of the sound is
on the horizontal axis, and the sound pressure level (dB) is on the vertical axis. , Are plotted
respectively. The graph (a) in the same figure shows the acoustic characteristics of the
microspeaker 23 alone, the graph (b) shows the acoustic characteristics of the single unit when
the piezoelectric element is used for the vibration actuator 13, and the graph (c) shows the
combination of both. The acoustic characteristics are shown respectively. The measurement was
performed on the central axis of the screen of the display device 22 of the mobile telephone
terminal 10 and at a separation distance of 10 cm, and a condenser microphone for
measurement was used. The micro speaker 23 to be measured was of an electromagnetic type
having a diameter of 16 mm. The vibration actuator 13 is a piezoelectric rectangular
parallelepiped actuator, and the dimensions of the rectangular parallelepiped used were 25 mm
in length, 4 mm in width, and 4 mm in thickness. A resin plate material having a length of 15 cm,
a width of 15 cm, and a thickness of 10 cm was used for the external housing 32 on which the
mobile phone terminal 10 is mounted.
[0020]
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At the time of measurement, the power consumption of the audio drive amplifier for driving the
audio output unit was adjusted to be about 0.5 W at 1 kHz. Comparing the characteristic (a) of
the microspeaker 23 and the characteristic (b) of the vibration actuator 13, the characteristic (a)
of the microspeaker 23 exceeds the characteristic (b) of the vibration actuator 13 in the high
frequency range of 5 kHz or more. The characteristic (b) of the vibration actuator 13 exceeds the
characteristic (a) of the microspeaker 23 in the lower middle frequency range. In particular, in
the frequency band below the primary resonance frequency of the vibration actuator 13, the
characteristic (b) of the vibration actuator 13 exceeds the characteristic (a) of the microspeaker
23 by about 20 dB or more. This is a result of enabling the low frequency range reproduction
difficult with the micro speaker 23 by vibrating the external casing 32 having a low vibration
resonance frequency by the piezoelectric actuator capable of obtaining the vibration to the low
frequency range of 100 Hz or less. .
[0021]
As shown by graph (c) in FIG. 3, when both sound output units 13 and 23 are simultaneously
driven, the sound pressure of both is added to cover a wide frequency range from high to low
frequencies. Audio playback is possible. Further, in the present mobile phone terminal 10, by
using the fact that the entire terminal vibrates finely by inputting a low frequency signal to the
vibration actuator 13 in response to the user pressing a key or calling a telephone, the click
feeling of the key and It is also possible to improve the ringing tone and the like.
[0022]
As described above, in the electronic device according to the present invention, in addition to the
conventionally mounted microspeaker, a vibration actuator is mounted to drive a housing or the
like of the electronic device, and an external case for mounting the electronic device By using the
body, the reproduction performance in the middle to low range, which was conventionally
difficult to reproduce, is significantly improved. Therefore, the sound pressure in the entire
frequency band is improved, and good sound reproduction is possible. In addition, it was also
confirmed that, even when the external housing is not used, the vibration characteristic of the
housing itself of the electronic device can significantly improve the acoustic characteristics in the
middle and low frequency parts.
[0023]
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FIG. 4 shows a mobile phone terminal 10A having a sound reproduction device according to a
second embodiment of the present invention. In the present embodiment, the micro speaker 23
installed in the upper housing 21 is monaural, and the other configuration is the same as that of
the first embodiment. Also in this embodiment, the same effect as that of the first embodiment
can be obtained.
[0024]
In the sound reproducing apparatus according to the present invention, it is possible to use an
accessory of a small electronic device and a charge adapter or a cradle as separately purchased
parts as an external case (sounding body). In that case, for example, as shown in FIG. 5 (third
embodiment), it is preferable to adopt a hinge having a structure in which the lower case 11 of
the compact electronic device 10B is folded on the back side of the upper case 21. In the
example of FIG. 5, the microspeaker 23 is disposed in the upper housing 21 and the vibration
actuator 13 is mounted in the lower housing 11 as in the previous embodiment. When such a
hinge structure is adopted, the small electronic device 10B is disposed on the charge adapter or
cradle 33, and the moving image displayed on the screen of the display device 22 and the sound
reproduced in a wide band by the speaker 23 and the vibration actuator 13 It becomes possible
to enjoy (sound) at the same time. In FIG. 5, the same components as those in FIG. 1 are
designated by the same reference numerals and their detailed description will be omitted.
[0025]
FIG. 6 is a block diagram showing an electronic apparatus on which the sound reproducing
apparatus according to the fourth embodiment of the present invention is mounted. The portable
electronic device 10C includes a sound signal source 41, a DSP 42 including a demodulation
circuit 43, a composite circuit 44, and a sound signal processing circuit 45, a first sound output
unit 23 formed of a micro speaker, and a second formed of a piezoelectric element. An acoustic
output unit 13, a first drive circuit 51 for driving the first acoustic output unit 23, a second drive
circuit 56 for driving the second acoustic output unit 13, a first acoustic output unit 23, and It
has the housings 21 and 11 which mount the 2nd sound output part 13, respectively.
[0026]
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The first drive circuit 51 includes a D / A converter 47, a high pass filter 48, a driver amplifier
49, and a low pass filter 50. The second drive circuit 56 further includes a D / A converter 52, a
low pass filter 53, a driver amplifier 54, and a low pass filter 55. Both D / A converters 47, 52
convert the output of the DSP 42 into an analog signal. The high pass filter 48 of the first drive
circuit 51 cuts off frequency components in the low frequency range, for example, by a cutoff
frequency of 1 kHz and a cutoff characteristic of 3 dB / oct. Further, the low pass filter of the
second drive circuit 56 cuts off frequency components in a high frequency region, for example,
by a cutoff frequency of 1 kHz and a cutoff characteristic of 3 dB / oct. The low pass filters 50
and 55 remove outputs of both driver amplifiers 49 and 54 from which frequency components
higher than the audio frequency are removed, and output from the second and first sound output
units 13 and 23, respectively.
[0027]
FIG. 7 shows the frequency characteristics of the high pass filter 48 and the low pass filter 53. By
aligning the cut-off frequency (1 kHz) and the cut-off characteristic (3 dB / oct) of the high pass
filter 48 and the low pass filter 53 as shown, the entire output acoustic signal has substantially
flat frequency characteristics.
[0028]
In the present embodiment, the output of the acoustic signal source 41 is processed by the DSP
42 and input to the first and second drive circuits 51 and 56. In the first drive circuit 51, the
high frequency pass filter 48 removes low frequency components and the low pass filter 50
removes high frequency components above the audio frequency to form a first electromagnetic
microspeaker. The sound output unit 23 is output. The second drive circuit 56 is a second type of
piezoelectric actuator in which the high frequency component is removed by the low pass filter
53 and the high frequency component is removed by the low pass filter 55. The sound is output
from the sound output unit 13.
[0029]
Since the piezoelectric actuator 13 has an electrical impedance that is substantially pure
capacitive, it has a low impedance in a high frequency range, making it difficult to drive a low
current. Therefore, in the present embodiment, the piezoelectric actuator 13 adopts a
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configuration in which high frequency components are removed and input is performed. In
addition, the electromagnetic micro speaker 23 has low reproduction performance in a low
frequency range, and tends to generate distortion in a high frequency low frequency range
signal. For this reason, low frequency components are removed from the electromagnetic micro
speaker 23 and input. With this configuration, in the present embodiment, low current drive and
drive with reduced distortion of voice in a low frequency range are enabled.
[0030]
In the present embodiment, a band pass filter is inserted into the signal analog-converted by the
D / A converters 47 and 52. However, a filter / equalizer may be provided inside the signal
processing unit or inside the D / A converter. It is also possible to carry out the process.
[0031]
FIG. 8 is a modification of the embodiment of FIG.
In the electronic device 10D of the present modified example, the vibration actuator 13 is
disposed in the rear housing portion of the upper housing 21. The other configuration is the
same as the configuration of FIG. That is, in the electronic apparatus having the sound
reproducing apparatus of the present invention, the vibration actuator 13 may not necessarily be
installed on the housing portion (lower housing 11) in contact with the external housing 32, as in
the above modification. In the vicinity of the display 22. In this case, the vibration actuator 13
improves acoustic characteristics by vibrating the entire housing of the electronic device 10D.
Further, the vibration actuator in the present invention does not have to be mounted directly on
the housing, and for example, if it is a portion mechanically coupled to the housing and vibration
can easily be transmitted, electronic components etc. are mounted. It may be on a substrate.
[0032]
As mentioned above, although this invention was demonstrated based on the suitable
embodiment, the electronic device and the sound reproduction method of this invention are not
limited only to the structure of the said embodiment, The structure of the said embodiment is
various from the structure Those modified and changed are also included in the scope of the
present invention. Moreover, although it is preferable to use together with the essential structure
of this invention about each structure described by each structure and embodiment described as
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the suitable aspect of this invention, about the structure which has a beneficial effect even if it is
independent. It is not necessary to use with all the configurations described as the essential
configurations of the present invention.
[0033]
Although a part or all of the above-mentioned embodiment may be described as the following
supplementary notes, it is not limited to the following.
[0034]
(Supplementary Note 1) A first acoustic output unit configured of a speaker, and a second
acoustic output unit configured of a vibration actuator that converts an electrical signal into
vibration and a structural member driven by the vibration actuator. An electronic device
characterized by
[0035]
(Supplementary Note 2) The electronic device according to Supplementary Note 1, wherein the
speaker is an electromagnetic, piezoelectric or electrostatic speaker.
[0036]
(Supplementary Note 3) The electronic device according to Supplementary note 1 or 2, wherein
the vibration actuator is an electromagnetic type, a piezoelectric type, or an electrostatic type
actuator.
[0037]
(Supplementary Note 4) The electronic device according to any one of Supplementary notes 1 to
3, characterized in that the structural member is a plate material that constitutes a part of a
housing.
[0038]
(Supplementary Note 5) The first acoustic output unit includes a high pass filter connected to the
signal input side, and the second acoustic output unit is connected to the signal input side and is
equivalent to the cutoff frequency of the high pass filter. The electronic device according to any
one of appendices 1 to 4, further comprising a low pass filter having a cutoff frequency of
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[0039]
(Supplementary Note 6) The electronic device according to any one of Supplementary notes 1 to
5, further including a drive unit that drives the second sound output unit in conjunction with a
key input.
[0040]
(Supplementary note 7) The electronic device according to any one of supplementary notes 1 to
6, which is incorporated in a portable terminal device.
[0041]
(Supplementary Note 8) The mobile terminal device includes first and second housing portions
rotatably coupled to each other, and the first sound output unit is disposed in the first housing
portion. The electronic device according to Appendix 7, wherein the second sound output unit is
disposed in the second housing portion.
[0042]
(Supplementary Note 9) A method of reproducing sound using the portable terminal device
according to Supplementary note 7 or 8, wherein the portable terminal device is mounted on an
external housing, a charging device, or a cradle to reproduce the sound. Characteristic sound
reproduction method.
[0043]
The present invention is effective for high-quality sound reproduction in an electronic device
having a low reproduction capacity of sounds such as voice and music because the size of the
case is small like a portable terminal device such as a portable telephone.
[0044]
10, 10A to 10D: Electronic device 11: lower housing 12: keyboard 13: vibration actuator
(piezoelectric element) 14: substrate 21: upper housing 22: display device 23: speaker 31: hinge
41: acoustic signal source 42: DSP 43: demodulation circuit 44: composite circuit 45: acoustic
signal processing circuit 47, 52: D / A converter 48: high pass filter 49, 54: driver amplifier 53,
50, 55: low pass filter 51: first drive circuit 56: first 2 drive circuit
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