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JP2013121036

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DESCRIPTION JP2013121036
Abstract: To provide an electroacoustic transducer capable of improving a waterproof function
without changing the shape of a speaker. A control unit 11 exceeds an input power upper limit
value Wu determined by a temperature detected in the vicinity of an electrodynamic speaker 18
having a waterproof structure using an elastic adhesive that becomes a rubbery elastic body after
curing. The volume supplied to the speaker 18 is controlled so as not to occur. That is, the
waterproof function is improved without changing the shape of the speaker by relieving the
stress applied to the bonding portion 25 and avoiding the decrease in the reliability of the
waterproof function. [Selected figure] Figure 5
Electro-acoustic transducer, electro-acoustic transducer method and program
[0001]
The present invention relates to an electro-acoustic transducer suitable for use in an electronic
device such as a portable terminal, an electro-acoustic transducer method, and a program.
[0002]
In an electronic device such as a mobile phone, a voice coil is provided between a yoke and a
magnetic circuit consisting of a magnet disposed inside the yoke, and a voice coil provided
suspended from a diaphragm positioned above the magnet. Electrodynamic speakers are often
used.
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In addition, about this kind of speaker, it is disclosed by patent document 1, for example.
[0003]
JP, 2009-10512, A
[0004]
By the way, development of a waterproof speaker is actively performed with the spread of
waterproof terminals in recent years.
In a waterproof speaker, a diaphragm that does not allow water to penetrate and a waterproof
structure of a joint that joins various components are important elements. With regard to the
vibrating film, there is no problem unique to a waterproof speaker in order to satisfy the
waterproof function by using a resin film such as PET (polyethylene terephthalate). However,
with regard to the watertight structure of the joint, It is done.
[0005]
Usually, the bonding portion is fixed and sealed using an adhesive having a waterproof function,
but the adhesive peels off due to aged deterioration at a portion where stress concentrates at the
time of speaker ringing, for example, a bonding portion between a diaphragm and a frame Invite
a decline in In particular, in the case of the electrodynamic speaker, since the magnetic circuit is
formed under the vibrating membrane, if the waterproof function is lost, there is a possibility
that a malfunction such as an electrical short circuit or the like may be caused.
[0006]
In order to avoid such adverse effects, a new locking mechanism may be provided to protect the
joint between the vibrating membrane and the frame, but adding such a new mechanism leads to
an increase in size and a stylish design. It is difficult to adopt this because of the limitation of the
device size in recent mobile terminals that appeal. In other words, there is a problem that the
waterproof function can not be improved without changing the shape of the speaker.
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[0007]
The present invention has been made in view of such circumstances, and it is an object of the
present invention to provide an electro-acoustic transducer, an electro-acoustic transducer
method, and a program that can improve the waterproof function without changing the shape of
the speaker.
[0008]
In order to achieve the above object, an electroacoustic transducer according to the present
invention comprises a speaker having a waterproof structure using an elastic adhesive that
becomes an elastic body after curing, a temperature detection unit that detects the temperature
of the speaker, and the temperature And a volume control unit configured to control the volume
supplied to the speaker according to the input power upper limit value determined by the
temperature detected by the detection unit.
[0009]
In the electro-acoustic conversion method of the present invention, a temperature detection
process for detecting the temperature of a speaker having a waterproof structure using an elastic
adhesive that becomes an elastic body after curing is determined by the temperature detected in
the temperature detection process. And a volume control process of controlling the volume
supplied to the speaker according to the input power upper limit value.
[0010]
Furthermore, the program according to the present invention is determined by the temperature
detection step of detecting the temperature of a speaker having a waterproof structure using an
elastic adhesive that becomes an elastic body after curing, and the temperature detected in the
temperature detection step. And a volume control step of controlling the volume supplied to the
speaker according to the input power upper limit value.
[0011]
In the present invention, the waterproof function can be improved without changing the shape of
the speaker.
[0012]
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It is sectional drawing which shows the structure of the speaker 18 by one Embodiment.
It is a graph which shows the characteristic (Shear elastic modulus G and logarithmic attenuation
factor αT) of the cured elastic adhesive.
It is a figure which shows an example of a temperature / input electric power table.
FIG. 1 is a block diagram showing a configuration of a portable terminal 100 provided with an
electroacoustic transducer according to an embodiment.
It is a flow chart which shows operation of input power control processing.
[0013]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
A. SUMMARY OF THE INVENTION FIG. 1 is a cross-sectional view showing the structure of a
speaker 18 according to an embodiment. The speaker 18 shown in this figure constitutes a
known electrodynamic type composed of a frame 20, a yoke 21, a magnet 22, a plate 23, a
diaphragm 24, a bonding portion 25 and a voice coil 26. The frame 20 is formed in a cylindrical
container shape from a nonmagnetic material (for example, a resin material such as ABS). The
yoke 21 is provided at the bottom of the frame 20 and has a bottomed cylindrical recess formed
of a magnetic material. A cylindrical magnet 22 is fixed in the recess of the yoke 21 with a
predetermined gap between it and the circumferential side wall.
[0014]
On the upper surface of the magnet 22, a plate 23 of a disc-like magnetic material acting as a
pole piece is fixed. By such arrangement, the yoke 21, the magnet 22 and the plate 23 constitute
a magnetic circuit. The outer peripheral edge portion of the vibrating film 24 formed of a resin
film such as PET (polyethylene terephthalate) is fixed to the outer peripheral edge portion of the
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frame 20 by the bonding portion 25. An upper end portion of the voice coil 26 provided so as to
hang from the vibrating membrane 24 located above the magnet 22 and the plate 23 is fixed to
the back surface of the vibrating membrane 24 and is vertically movable.
[0015]
The feature of the present invention is that, in the electrodynamic speaker 18 having the abovedescribed structure, an elastic adhesive which becomes a rubber-like elastic body after being
cured to the adhesive portion 25 which adheres the outer peripheral edge of the vibrating film
24 to the outer peripheral edge And control the power (corresponding to the volume level) input
to the speaker 18 according to the temperature of the speaker 18 as described in the laterdescribed embodiment, thereby fixing the diaphragm 24 to the frame 20. The stress applied to
the bonding portion 25 is alleviated to improve the waterproof function.
[0016]
The elastic adhesive used for the bonding portion 25 has high rigidity and is more likely to cause
stress concentration than an epoxy-based adhesive, as apparent from the characteristics after
curing (logarithmic attenuation factor αT / shear elastic modulus G) illustrated in FIG. 2. And has
adhesive properties that are tenacious and resistant to stress concentration in a rubbery elastic
region from a low temperature (glass transition temperature Tg) to a high temperature.
Therefore, the bonding portion 25 which becomes a rubbery elastic body after curing disperses
the stress generated in accordance with the vertical vibration of the voice coil 26.
[0017]
In addition, even in the rubbery elastic region, the ability to disperse stress is also reduced in the
low temperature region due to the elastic reduction of the bonding portion 25. Therefore, the
possibility of the vibrating film 24 peeling from the frame 20 is increased, and the waterproof
function is reliable. Cause sex decline. Therefore, in the present invention, the temperature /
input power table representing the relationship between the temperature of the speaker 18 and
the input power causing a decrease in the reliability of the waterproof function is acquired based
on experimental findings.
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[0018]
FIG. 3 is a diagram showing an example of the temperature / input power table. In this table, the
horizontal axis represents the input power W of the speaker 18 (unit: W), the vertical axis
represents the temperature T (unit: ° C.), ○ represents reliability matching, and x and Δ
represent reliability nonconforming. Specifically, for example, when the temperature of the
speaker 18 is 0 ° C., an input power of 0.2 W is acceptable, and when the temperature of the
speaker 18 is 30 ° C., an input power of 1 W is acceptable. Represent. In the embodiment
described later, such a temperature / input power table is stored in the ROM 12 as a data table.
[0019]
B. Embodiment (1) Configuration FIG. 4 is a block diagram showing a configuration of a
portable terminal 100 provided with the electro-acoustic transducer according to one
embodiment. The portable terminal 100 includes a communication processing unit 10 having an
antenna ANT, a control unit 11, a ROM 12, a RAM 13, a display unit 14, an operation unit 15, a
microphone 16, a temperature sensor 17, and the speaker 18 described above.
[0020]
The communication processing unit 10 demodulates the received signal input through the
antenna ANT to generate voice data, and outputs the generated voice data to the control unit 11
while the voice data supplied from the control unit 11 And transmit the radio signal from the
antenna ANT.
[0021]
The control unit 11 includes a CPU, a DSP for baseband signal processing, and the like, reads
various processing programs stored in the ROM 12 to perform various calculations, and
responds to operation events supplied from the operation unit 15 described later. Control the
operation of each part of the terminal.
Specifically, the voice data in the call output from the communication processing unit 10 is
subjected to expansion processing, and the expanded voice data is D / A converted to an analog
audio signal to be sounded from the speaker 18, and from the microphone 16 The analog audio
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signal to be output is A / D converted, and the A / D converted data is compressed and supplied
to the communication processing unit 10. Further, the control unit 11 executes an input power
control process (described later) for controlling the input power (corresponding to the volume
level) to the speaker 18 according to the temperature in the vicinity of the speaker 18 detected
by the temperature sensor 17. .
[0022]
The ROM 12 comprises a program area and a data area. The program area of the ROM 12 stores
various processing programs to be executed by the control unit 11. The various processing
programs include an input power control process described later. The temperature / input power
table (see FIG. 3) described above is stored in the data area of the ROM 12. The RAM 13 includes
a work area for temporarily storing flags and register data used for various processes executed
by the control unit 11, and a data area for storing, for example, call origination / reception
history and transmission / reception mail.
[0023]
The display unit 14 includes a color liquid crystal panel and a display driver, and displays various
screens such as a standby screen under the control of the control unit 11. The operation unit 15
has various switches such as a power switch and an off-hook / on-hook switch operated at the
time of call start / end, and generates various operation events according to the operation of
these switches. The temperature sensor 17 is disposed in the vicinity of the speaker 18 and
detects and outputs a temperature under the control of the control unit 11.
[0024]
(2) Operation Next, the operation of the input power control process executed by the control unit
11 of the mobile terminal 100 will be described with reference to FIG. The input power control
process is executed as a timer interrupt at predetermined intervals in a state where an audio
signal is output to the speaker 18. At the execution timing, the control unit 11 proceeds to step
S1 shown in FIG. 5, and detects the temperature based on the output of the temperature sensor
17 disposed in the vicinity of the speaker 18.
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[0025]
Subsequently, in step S2, the input power upper limit value Wu for the temperature detected in
step S1 is acquired from the temperature / input power table stored in the ROM 12. Here, the
input power upper limit value Wu referred to here indicates the maximum value of the input
power whose reliability is adapted to the detected temperature. Specifically, for example, in the
temperature / input power table shown in FIG. 3, if the detected temperature is 15 ° C., a circle
is added to the detected temperature, and the maximum of the reliability-matched input powers
is given. The value 0.7 W is the input power upper limit value Wu.
[0026]
Thus, when the input power upper limit value Wu corresponding to the detected temperature is
read out from the temperature / input power table of the ROM 12, the process proceeds to step
S3, where the current volume level (dB) is converted to the input power Wv. Then, in step S4, it is
determined whether or not the input power Wv is equal to or greater than the input power upper
limit value Wu, that is, whether or not the input power causing the reliability of the waterproof
function is lowered is supplied to the speaker 18.
[0027]
If the input power causing the reliability reduction of the waterproof function is not supplied to
the speaker 18, the determination result is NO , and the processing is finished, but the input
power causing the reliability reduction of the waterproof function is supplied to the speaker 18 If
YES, the determination result is "YES", the process proceeds to step S5, the volume control is
performed so that the input power Wv does not exceed the input power upper limit value Wu,
and the process is ended.
[0028]
As described above, in the present embodiment, an elastic adhesive agent that becomes a rubberlike elastic body after curing is used for the bonding portion 25 that adheres the diaphragm 24
of the speaker 18 to the frame 20 and at the temperature detected in the vicinity of the speaker
18 The volume supplied to the speaker 18 is controlled so as not to exceed the determined input
power upper limit value Wu.
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That is, since the stress applied to the bonding portion 25 is relieved to avoid the decrease in the
reliability of the waterproof function, the waterproof function can be improved without changing
the shape of the speaker.
[0029]
In the embodiment described above, the input power upper limit value Wu corresponding to the
temperature detected in the vicinity of the speaker 18 is acquired, but instead, the elastic
modulus of the elastic adhesive after curing is changed to the humidity as well. Because of the
dependency, the input power upper limit value Wu corresponding to the humidity detected in the
vicinity of the speaker 18 is acquired, and the volume control is performed so as not to exceed
the input power upper limit Wu without changing the speaker shape. The waterproof function
can also be improved.
[0030]
Further, the present invention is not limited to the above-described embodiment, and various
modifications can be made within the scope of the present invention.
As an example, this embodiment can be applied not only to terminal devices such as mobile
phones and smartphones, but also to other devices (game devices, tablet PCs, laptops / laptop
PCs, etc.) having an audio output function. It goes without saying that
[0031]
C. Additional Notes Next, the features of the present invention will be added. In addition,
although a part or all of said embodiment may be described like the following additional remarks,
it is not limited to the description.
[0032]
(Supplementary Note 1) A speaker provided with a waterproof structure using an elastic adhesive
that becomes an elastic body after curing, a temperature detection unit that detects the
temperature of the speaker, and an input power upper limit determined by the temperature
detected by the temperature detection unit And a volume control means for controlling the
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volume supplied to the speaker according to the value.
[0033]
(Supplementary Note 2) The sound volume control means, an upper limit value generation means
for generating an input power upper limit value that does not cause a decrease in the reliability
of the waterproof function of the speaker according to the temperature detected by the
temperature detection means; Means for determining whether or not the input power
corresponding to the volume supplied to the input power exceeds the input power upper limit
value generated by the upper limit value generating means; 2. The electric volume conversion
device according to claim 1, further comprising: control means for controlling the volume
supplied to the speaker so as not to exceed the input power upper limit value when it is
determined that the voltage exceeds the upper limit. .
[0034]
(Supplementary Note 3) A speaker provided with a waterproof structure using an elastic adhesive
that becomes an elastic body after curing, Humidity detection means for detecting humidity in
the vicinity of the speaker, Input power determined by the humidity detected by the humidity
detection means And a volume control unit configured to control a volume supplied to the
speaker according to the upper limit value.
[0035]
(Supplementary Note 4) A temperature detection process of detecting a temperature of a speaker
provided with a waterproof structure using an elastic adhesive that becomes an elastic body after
curing, and an input power upper limit value determined by the temperature detected in the
temperature detection process. An electro-acoustic conversion method comprising: a volume
control process of controlling a volume supplied to the speaker.
[0036]
(Supplementary Note 5) The volume control process includes an upper limit value generation
process for generating an input power upper limit value that does not cause a decrease in the
reliability of the waterproof function of the speaker according to the temperature detected in the
temperature detection process. Determining whether the input power corresponding to the
volume supplied to the input power exceeds the input power upper limit value generated in the
upper limit generation process; and the input power determines the input power upper limit
value according to the determination process. 5. The method according to claim 4, further
comprising the step of controlling the volume supplied to the speaker so as not to exceed the
input power upper limit value when it is determined that the voltage exceeds the upper limit. .
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[0037]
(Supplementary Note 6) Humidity detection process of detecting humidity in the vicinity of a
speaker provided with a waterproof structure using an elastic adhesive which becomes an elastic
body after curing, and input power upper limit value determined by the humidity detected in the
humidity detection process. And a volume control process for controlling the volume supplied to
the speaker.
[0038]
(Supplementary Note 7) A temperature detection step of detecting a temperature of a speaker
provided with a waterproof structure using an elastic adhesive which becomes an elastic body
after curing in a computer, an input power upper limit value determined by the temperature
detected in the temperature detection step And a volume control step of controlling the volume
supplied to the speaker.
[0039]
(Supplementary Note 8) The sound volume control step includes an upper limit value generation
step of generating an input power upper limit value that does not cause a decrease in the
reliability of the waterproof function of the speaker according to the temperature detected in the
temperature detection step; Determining whether the input power corresponding to the volume
supplied to the input power exceeds the input power upper limit value generated in the upper
limit value generation step; 8. The program according to claim 7, further comprising: a control
step of controlling the volume supplied to the speaker so as not to exceed the input power upper
limit value when it is determined that the input power limit value is exceeded.
[0040]
(Supplementary Note 9) A humidity detection step of detecting humidity in the vicinity of a
speaker provided with a waterproof structure using an elastic adhesive that becomes an elastic
body after curing in a computer, Input power determined by the humidity detected in the
humidity detection step And a volume control step of controlling the volume supplied to the
speaker according to the upper limit value.
[0041]
Reference Signs List 10 communication processing unit 11 control unit 12 ROM 13 RAM 14
display unit 15 operation unit 16 microphone 17 temperature sensor 18 speaker 20 frame 21
yoke 22 magnet 23 plate 24 diaphragm 25 adhesive unit 26 voice coil 100 mobile terminal
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