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DESCRIPTION JP2014011616

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DESCRIPTION JP2014011616
Abstract: The present invention provides an electronic device system which achieves both design
and improvement in acoustic function with a simple configuration, and an electronic device using
the electronic device system. An electronic device system 1 includes a portable electronic device
100 and a holding unit 200 for holding the portable electronic device 100. The portable
electronic device 100 includes a front surface 110a and a hole 112 for sound wave emission of a
speaker 120. The holding unit 200 has a recess 210 for mounting the case 110 of the portable
electronic device 100, and the holding unit 200 has the recess 210 for holding the case 110 of
the portable electronic device 100. When the back surface 110 b of the housing 110 is placed
opposite to each other, the back surface 110 b of the housing 110 and the recess 210 of the
holding portion 200 form an air space 212 in which the sound wave 180 output from the hole
112 propagates. [Selected figure] Figure 2
Electronic device system and electronic device using the electronic device system
[0001]
The present invention relates to an electronic device system and an electronic device using the
electronic device system.
[0002]
2. Description of the Related Art In recent years, development of thin and stylish mobile phones
that make sound reproduction such as music reproduction such as smartphones and hands-free
as a commercial value has been activated.
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Among these, there is a high demand for an electroacoustic transducer that is compact, thin, and
high in sound quality. Patent Document 1 describes an example of a cradle device on which an
electronic device having such an acoustic function is placed. The cradle device and the electronic
device of Patent Document 1 have a speaker for outputting an acoustic signal input from the
electronic device, and when the electronic device is blocked by the speaker of the cradle when
the electronic device is placed on the cradle The sound signal output to the speaker is changed to
change the sound quality, sound pressure, frequency characteristics, etc. of the sound from the
speaker.
[0003]
Unexamined-Japanese-Patent No. 2007-124332
[0004]
In the cradle device and the electronic device described above, the acoustic signal of the
electronic device is output from the external speaker provided in the cradle device, and when the
electronic device is mounted on the cradle device, the internal provided on the back of the
electronic device Since the sound emission hole of the speaker is closed by the cradle device,
there was no idea of using the internal speaker of the electronic device to perform sound output.
[0005]
In addition, with the spread of smartphones and the like, the function as an information terminal
has been enhanced, and from the viewpoint of improving usability, an increase in screen size has
been required.
Under strict mounting restrictions, when the screen size of a liquid crystal display (LCD: Liquid
Crystal Display) or the like is enlarged, the speaker is required to be smaller on the back side and
the loudness is realized at the user's use position. It has become more difficult to
For this reason, there has been a demand for a revolutionary technology for achieving a large
volume without changing the speaker mounting conditions.
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[0006]
An object of the present invention is to provide an electronic device system which achieves both
design and improvement in acoustic function, and an electronic device using the electronic
device system.
[0007]
An electronic device system according to the present invention includes: a portable electronic
device; and a holding unit configured to hold the portable electronic device, the portable
electronic device having a front surface and a back surface provided with a hole for sound wave
emission of a speaker. The holding unit has a recess for mounting the case of the portable
electronic device, and the back surface of the case of the portable electronic device is opposed to
the recess of the holding unit. When placed, the rear surface of the housing and the concave
portion of the holding portion form an air space in which the sound wave output from the hole
propagates.
[0008]
The electronic device of the present invention uses the above-described electronic device system.
[0009]
Note that arbitrary combinations of the above-described components, and conversions of the
expression of the present invention among methods, apparatuses, systems, recording media,
computer programs and the like are also effective as aspects of the present invention.
[0010]
In addition, the various components of the present invention do not necessarily have to be
independent entities individually, and a plurality of components are formed as one member, and
one component is formed of a plurality of members. That one component is a part of another
component, that a part of one component overlaps with a part of another component, and so on.
[0011]
According to the present invention, there are provided an electronic device system which
achieves both design and improvement in acoustic function with a simple configuration, and an
electronic device using the electronic device system.
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[0012]
FIG. 1 is a front view showing an appearance of an electronic device system according to an
embodiment of the present invention.
It is sectional drawing in line AA of the electronic device system of FIG.
FIG. 1 is a block diagram showing a main configuration of an electronic device system according
to an embodiment of the present invention.
It is a partial cross-section top view in line BB of the electronic device system of FIG.
It is a figure which shows the sound wave frequency characteristic of the electronic device
system which concerns on embodiment of this invention.
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
In all the drawings, the same components are denoted by the same reference numerals, and the
description thereof will be appropriately omitted.
[0014]
FIG. 1 is a front view showing the appearance of an electronic device system 1 according to an
embodiment of the present invention.
FIG. 2 is a cross-sectional view of the electronic device system 1 shown in FIG. 1 taken along line
A-A. The electronic device system 1 according to the present embodiment includes a portable
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electronic device 100 and a holding unit 200 that holds the portable electronic device 100. The
portable electronic device 100 has a housing 110 having a front surface 110 a and a back
surface 110 b provided with holes 112 for sound wave emission of the speaker 120. The holding
unit 200 has a recess 210 in which the housing 110 of the portable electronic device 100 is
placed. When the back surface 110 b of the case 110 of the portable electronic device 100 is
placed opposite to the recess 210 of the holding unit 200, the sound wave 180 output from the
hole 112 is generated by the back surface 110 b of the case 110 and the recess 210 of the
holding unit 200. Form an air space 212 for propagation.
[0015]
In the present invention, the portable electronic device 100 is a hands-free portable electronic
device having an audio function such as music reproduction, and for example, a portable
telephone, a smart phone, a tablet terminal, a portable audio player, a portable video player, a
portable one segment television It is a receiver, a portable game machine, or the like. In each of
the following drawings, the configuration of the part not related to the essence of the present
invention is omitted and not shown. In the present embodiment, the portable electronic device
100 can be mounted on the holding unit 200 and used.
[0016]
The portable electronic device 100 includes the LCD 152 on the front surface 110 a of the
housing 110 and the speaker 120 on the back surface 110 b of the housing 110. A hole 112 for
sound wave emission of the speaker 120 is provided on the back surface 110 b of the housing
110. As a background having such a configuration, as described above, while the screen size of
the LCD 152 is enlarged, the speaker 120 may be required to be smaller on the back side of the
screen.
[0017]
As described above, since the speaker 120 is disposed on the back side of the screen of the LCD
152 of the portable electronic device 100, normally, when the portable electronic device 100 is
placed on a desktop holder or the like, the sound hole of the speaker 120 is blocked. It is difficult
to realize high volume at the user's use position, that is, the LCD 152 side of the portable
electronic device 100. So, in this embodiment, the recessed part 210 is provided in the position
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where the hole 112 for sound wave radiation of the speaker 120 opposes in the holding |
maintenance part 200. FIG. That is, when the portable electronic device 100 is placed on the
holding unit 200, the hole 112 for sound wave emission of the speaker 120 faces the concave
portion 210 of the holding unit 200.
[0018]
The recess 210 of the holder 200 is portable so that the sound wave 180 emitted from the sound
wave emitting hole 112 of the speaker 120 can be reflected and propagated when the portable
electronic device 100 is placed on the holder 200. The configuration is not particularly limited as
long as the air space 212 is formed between the back surface 110 b of the electronic device 100
and the holding unit 200. The air space 212 is desirably at least partially open.
[0019]
In the present embodiment, the recess 210 has a flat surface 210 a facing the back surface 110 b
of the portable electronic device 100. Furthermore, in the recess 210, spacers 210b are
provided, for example, on the upper and lower portions of the plane 210a, respectively, for
separating and opposing the back surface 110b of the portable electronic device 100 and the
plane 210a by a predetermined distance. The arrangement of the spacers 210b is not
particularly limited, and may be provided on the left and right, not on the top and bottom.
[0020]
In the present embodiment, the air space 212 formed by the back surface 110 b of the portable
electronic device 100 and the recess 210 is opened on at least one side of the portable electronic
device 100 in the front view of FIG. The sound waves 180 emitted from the holes 112 can be
reflected to the flat surface 210 a of the recess 210 and emitted to the front surface 110 a side
of the portable electronic device 100.
[0021]
With this configuration, the sound wave 180 emitted from the speaker 120 can be reflected by
the concave portion 210 of the holding unit 200 provided opposite to the sound wave emitting
hole 112 of the speaker 120. It can be emitted to the front of the screen of the LCD 152.
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[0022]
Furthermore, the electronic device system 1 according to the present embodiment includes the
vibrator 230, which is connected to the electrical signal of the acoustic output of the portable
electronic device 100 and converts the electrical signal into vibration, inside the holding unit
200.
Further, as shown in FIG. 3, the holding unit 200 includes a terminal 250 which is electrically
connected to the charge terminal 170 of the portable electronic device 100 when the portable
electronic device 100 is placed.
The electrical signal of the acoustic output of the portable electronic device 100 is input to the
vibrator 230 through the terminal 250. As shown in FIG. 2, the holding unit 200 is an acoustic
wave that radiates the sound wave 260 oscillated by the vibration of the vibrator 230 so that the
holding unit 200 has the same direction as the front surface 110 a side of the housing 110 of the
portable electronic device 100 placed. A radiation surface is provided on the front 200a. The
electronic device system 1 outputs an acoustic wave 180 so that the acoustic wave 180 is
emitted from the hole 112 of the speaker 120 of the portable electronic device 100 in
synchronization with the emission of the acoustic wave 260 from the acoustic emission surface
of the holding unit 200. It further comprises a controller 160 (FIG. 3) for controlling the
electrical signal.
[0023]
As shown in FIG. 3, the portable electronic device 100 includes a control unit 160 and a signal
generation unit 162. In addition, the portable electronic device 100 incorporates, for example, a
rechargeable battery 154 (FIG. 2), and is mounted on a holding unit 200 (hereinafter, also
referred to as “desktop holder 200”) such as a desktop holder called a cradle. In the state, it
can be charged. When the portable electronic device 100 is placed on the holding unit 200, the
charging terminal 170 of the portable electronic device 100 and the terminal 250 provided on
the holding unit 200 are configured to be electrically joined to each other. The structure of the
bonding portion between the holding portion 200 and the portable electronic device 100 is not
particularly limited, and the detailed description thereof is omitted because it is not related to the
essence of the present invention.
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[0024]
The charging terminal 170 and the terminal 250 further include terminals for signal lines for
transmitting an electrical signal of an acoustic output, in addition to the terminals for charging.
An electrical signal of acoustic output is transmitted from the portable electronic device 100 to
the terminal 250 of the holder 200 via the charging terminal 170.
[0025]
The control unit 160 synchronizes the radiation of the acoustic wave 260 from the acoustic
radiation surface of the holding unit 200 with the control unit 160, and emits the acoustic wave
180 so that the acoustic wave 180 is emitted from the hole 112 of the speaker 120 of the
portable electronic device 100. Control the signal. This occurs between the acoustic output to the
speaker 120 of the portable electronic device 100 and the acoustic output to the vibrator 230
due to the difference in the signal path from the signal generation unit 162 to the speaker 120
and the vibrator 230. It is intended to correct temporal deviations.
[0026]
The signal generation unit 162 generates an electrical signal of an acoustic output to be output
to the speaker 120 and an electrical signal of an acoustic output to be output to the holding unit
200 under the control of the control unit 160, and outputs the electrical signal to the speaker
120 and the holding unit 200, respectively. .
[0027]
In FIG. 3, each component of the portable electronic device 100 is a CPU (Central Processing
Unit), a memory, a program for realizing the component of the figure loaded in the memory, a
storage unit such as a hard disk storing the program, a network It is realized by any combination
of hardware and software of any computer (not shown) having an interface for connection.
And it is understood by those skilled in the art that there are various modifications in the
implementation method and apparatus. FIG. 3 shows not a hardware unit configuration but a
functional unit block. The CPU, memory, and the like of the portable electronic device 100
described above are mounted on the substrate 150 (FIG. 2). The LCD 152 and the speaker 120
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are also electrically connected to the substrate 150 and controlled by the CPU.
[0028]
In the portable electronic device 100 of the present embodiment, various units as shown in FIG.
3 are realized as various functions by the CPU executing various processing operations
corresponding to the computer program. A computer program for realizing the portable
electronic device 100 of the present embodiment may be recorded on a computer readable
recording medium. The recording medium is not particularly limited, and various forms can be
considered. Also, the program may be loaded from the recording medium into the memory of the
computer, or may be downloaded to the computer through the network and loaded into the
memory.
[0029]
In addition, although a plurality of procedures are described in order in the method and
computer program of the present invention, the order of the description does not limit the order
in which the plurality of procedures are performed. For this reason, when implementing the
method and computer program of the present invention, the order of the plurality of procedures
can be changed without causing any problem in content.
[0030]
Furthermore, the plurality of procedures of the method and computer program of the present
invention are not limited to being executed at individually different timings. Therefore, another
procedure may occur during the execution of a certain procedure, or a part or all of the
execution timing of the certain procedure may overlap with the execution timing of the other
procedure, or the like.
[0031]
In the present embodiment, the vibrator 230 can be a piezoelectric vibrator. In the present
embodiment, the vibrator 230 is mounted on the desktop holder 200 as a piezoelectric actuator.
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That is, using the vibrator 230, the tabletop holder 200 is vibrated to emit a sound wave. FIG. 4 is
a partial cross-sectional top view taken along line B-B of the electronic device system 1 of FIG. As
shown in FIG. 4, the vibrator 230 of this embodiment utilizes a bimorph structure having a
structure in which a piezoelectric element 234 formed of two piezoelectric ceramic elements is
constrained by an elastic member 232 formed of a metal plate or the like. it can. The elastic
member 232 preferably uses a carbon-based material. Further, the piezoelectric element is
formed of a piezoelectric ceramic and an electrode layer, and the piezoelectric element performs
expansion and contraction motion by applying an electric field to the piezoelectric element.
[0032]
In the present embodiment, the vibrator 230 has a plate shape having a horizontally long
rectangular flat surface, and is fixed by the holder of the support portion 240 at the central
portion. The support portion 240 is joined to the inside of the acoustic emission surface provided
on the front surface 200 a of the desktop holder 200 via the elastic member 242. At this time,
the plane of the vibrator 230 is arranged to be parallel to the acoustic radiation surface of the
desktop holder 200.
[0033]
The distance between the flat surface of the vibrator 230 and the acoustic radiation surface of
the desktop holder 200 is desirably close to the extent that the acoustic radiation surface of the
desktop holder 200 can be vibrated by the sound wave oscillated by the vibrator 230. It is
desirable that the front surface 200 a of the desktop holder 200 has a material and thickness
that can vibrate the acoustic radiation surface by the sound wave oscillated by the vibrator 230
and maintain the strength of the desktop holder 200. For example, the desktop holder 200 can
be formed by molding a resin to a thickness of about 0.5 mm at least on the front surface 200 a.
[0034]
The operation and effects of the electronic device system 1 of the present embodiment
configured as described above will be described. According to the electronic device system 1 of
the present embodiment, the holding unit 200 is provided with the recess 210 at the position
where the sound wave emitting holes 112 of the speaker 120 face each other, so the holding
portion 200 faces the sound wave emitting holes 112 of the speaker 120 The sound wave 180
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emitted from the speaker 120 can be reflected by the concave portion 210 of the holding unit
200 provided as described above, so that the sound wave 180 can be emitted to the front of the
screen of the LCD 152 of the portable electronic device 100. That is, according to the electronic
device system 1 of the present embodiment, the increase in the volume can be realized with a
simple configuration, and the acoustic function can be improved. And according to the electronic
device system 1 of this embodiment, it is not necessary to change the structure of the portable
electronic device 100, and the improvement of the designability and an acoustic function can be
made to make compatible.
[0035]
Furthermore, according to the electronic device system 1 of the present embodiment, the control
unit 160 uses the vibrator 230 as an excitation source and synchronizes with the speaker 120 of
the portable electronic device 100 in synchronization with emitting the sound wave 260 from
the desktop holder 200. The sound wave 180 is emitted from the As described above, in FIG. 2,
the speaker 120 is disposed on the back with respect to the screen, but the sound wave 180 is
reflected by reflecting the sound wave 180 by the recess 210 of the desktop holder 200 in front
of the speaker 120. It can be emitted to the front. Then, by making the sound wave 260 emitted
from the recess 210 of the desktop holder 200 interfere with the sound wave 180 emitted from
the desktop holder 200 in this manner, the sound wave is amplified, and the user side (the
portable electronic device 100 A large volume can be realized on the front surface 110a side). As
described above, according to the electronic device system 1 of the present embodiment, since
the volume of the speaker 120 of the portable electronic device 100 can be amplified using the
desktop holder 200, the acoustic function and design of the portable electronic device 100 itself
It is possible to balance the qualities, and its industrial value is greatly improved.
[0036]
Furthermore, according to the electronic device system 1 of the present embodiment, since the
vibrator 230 uses a piezoelectric vibrator, in an electrodynamic speaker using a magnetic circuit,
the sound pressure level emitted therefrom depends on the volume exclusion amount Therefore,
in the miniaturized electro-acoustic transducer, the problem that the sound pressure level is
limited in principle can be solved.
[0037]
On the other hand, since the piezoelectric element of the vibrator 230 is a brittle material, there
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is a problem in the impact stability when dropped.
In addition, since the piezoelectric element has a high mechanical Q, a high amount of vibration
can be obtained in the vicinity of the resonance frequency, but the amount of vibration is
attenuated in the other bands. There was a problem in flatness of pressure frequency
characteristics. In the electronic device system 1 of the present embodiment, since a carbonbased material is preferably used as the elastic material of the elastic member 232 of the
piezoelectric element, there is an effect that the damping effect is large.
[0038]
Furthermore, according to the electronic device system 1 of the present embodiment, the
vibrator 230 is joined to the desktop holder 200 via the elastic member 242, thereby absorbing
the vibration at the same time as falling, and at the same time the machine Q of the vibrator 230.
It can be reduced. Further, according to the electronic device system 1 of the present
embodiment, the vibrator 230 adopts a bimorph structure, so that the volume and the sound
pressure of the sound output of the piezoelectric element 234 are compared with those of a
single monomorph structure. Can be increased.
[0039]
The graph which shows the frequency characteristic of a sound pressure level when the
electronic device system 1 of this embodiment is used for FIG. 5 is shown as a continuous line.
The broken line is a graph when the electronic device system 1 of this embodiment is not used.
As understood from FIG. 5, according to the electronic device system 1 of the present
embodiment, it is possible to improve the quality of the sound output.
[0040]
Moreover, the portable electronic device 100 which concerns on embodiment of this invention
has an effect mentioned above by using the desktop holder 200 of this embodiment.
[0041]
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Although the embodiments of the present invention have been described above with reference to
the drawings, these are merely examples of the present invention, and various configurations
other than the above can also be adopted.
For example, in the above embodiment, as shown in FIG. 1, the vibrator 230 has a horizontally
long rectangular shape provided at the central portion of the front surface 200 a of the desktop
holder 200, but the present invention is not limited thereto. . For example, the shape of the
vibrator 230 may be circular or any shape other than rectangular. It is desirable that the shape of
the surface facing the front surface 200 a of the desktop holder 200 be a shape that uniformly
extends outward from the center on the same line centering on the support portion 240 of the
vibrator 230. By supporting the center of the vibrator 230, the vibration width increases in both
end directions extending from the center.
[0042]
In addition to the configuration in which one vibrator 230 is provided at the center of the
desktop holder 200, a plurality of vibrators 230 may be provided. The plurality of transducers
230 is preferably provided to the left and right with respect to the front surface 200 a of the
desktop holder 200.
[0043]
Although the present invention has been described above with reference to the embodiments, the
present invention is not limited to the above embodiments. The configurations and details of the
present invention can be modified in various ways that can be understood by those skilled in the
art within the scope of the present invention.
[0044]
Reference Signs List 1 electronic device system 100 portable electronic device 110 housing 110a
front 110b rear surface 112 hole 120 speaker 150 substrate 154 battery 160 control unit 162
signal generation unit 170 charge terminal 180 acoustic wave 200 holding unit, desktop holder
200a front surface 210 recess 210a flat surface 210b spacer 212 Air space 230 Vibrator 232
Elastic member 234 Piezoelectric element 240 Support 242 Elastic member 250 Terminal 260
Sound wave
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