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JP2013120959

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2013120959
PROBLEM TO BE SOLVED: To make it difficult for water to adhere to the upper surface side of a
vibrating membrane of an electroacoustic transducer provided inside of the sound hole of the
casing of a mobile phone even if water infiltrates from the sound hole. SOLUTION: A surface
treatment layer 26 for dropping water attached to the upper surface side of the vibrating film 23
from the outer peripheral edge of the vibrating film 23 is provided on the upper surface of the
vibrating film 23 of the electroacoustic transducer 11. . Water entering the sound holes 2 of the
housing 1 and adhering to the upper surface side of the surface treatment layer 26 is led to the
periphery of the surface treatment layer 26, and the drainage groove 13 provided around the
periphery and the hydrophilic layer 34 on the inner surface It is drained to the outside of the
housing 1 through the drain pipe 33 provided and the drain hole 31 provided in the housing 1.
This makes it possible to prevent water from adhering to the upper surface side of the vibrating
film 23. [Selected figure] Figure 1
Electro-acoustic transducer and portable electronic device using the same
[0001]
The present invention relates to an electroacoustic transducer and a portable electronic device
such as a cellular phone using the same.
[0002]
In an electroacoustic transducer used in a conventional cellular phone or the like, a vibrating film
is provided inside a sound hole plate having a sound hole, and the vibration between the
vibrating plate and the sound hole plate is provided by the vibration of the vibration plate. There
is one in which air vibrates, and this air vibration leaks to the outside through a sound hole,
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thereby emitting sound (see, for example, Patent Document 1).
[0003]
Japanese Patent Application Laid-Open No. 2002-186075
[0004]
In the electroacoustic transducer described in FIG. 6 of Patent Document 1, a water repellent
layer is provided on the outer surface of the sound hole plate and the inner wall surface of the
sound hole, and the outer surface of the sound hole plate and the water repellent function of this
water repellent film. Water is less likely to be attached to the inner wall surface of the sound
hole, and hence water is less likely to be attached to the surface of the vibrating film, whereby
the vibration characteristics of the vibrating film due to the adhesion of water are less likely to be
changed.
[0005]
However, in the above-described conventional electroacoustic transducer, water adheres to the
outer surface of the sound hole plate and the inner wall surface of the sound hole by the water
repelling action of the water repellent layer provided on the outer surface of the sound hole plate
and the inner wall surface of the sound hole. However, water can not be completely prevented
from invading the inside of the sound hole plate through the sound hole, and water adheres to
the surface of the vibrating membrane, and There is a problem that vibration characteristics may
change.
[0006]
Therefore, the present invention provides an electro-acoustic transducer capable of preventing
water from adhering to the surface side of the vibrating film even if water intrudes from the
sound hole, and a portable electronic device using the same. To aim.
[0007]
An electro-acoustic transducer according to the present invention includes a bottomed cylindrical
frame and a vibrating membrane whose lower surface outer peripheral portion is fixed to an
upper surface of a peripheral wall portion of the frame, and the vibrating membrane has the
upper surface A surface treatment layer for dropping water attached to the upper surface side
from an outer peripheral edge of the vibrating membrane is provided, and a drainage groove is
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provided in a peripheral wall portion of the frame.
A portable electronic device according to the present invention comprises a casing having a
sound hole and a drainage hole, a cylindrical frame with a bottom, a vibrating membrane whose
lower surface outer peripheral portion is fixed to an upper surface of a peripheral wall portion of
the frame, and an upper surface of the vibrating membrane. A surface treatment layer for
dropping water attached to the upper surface side of the vibrating membrane from the outer
peripheral edge of the vibrating membrane, and a drainage groove provided in a peripheral wall
portion of the frame; And a drainage pipe provided so as to connect the drainage hole of the
housing and the drainage groove of the electroacoustic conversion device. It is characterized by
[0008]
According to this invention, even if water infiltrates from the sound hole, the water can be
prevented from adhering to the surface side of the vibrating membrane.
[0009]
BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing of the principal part of the mobile
telephone as 1st Embodiment of this invention.
FIG. 2 is a plan view in which a part of a vibrating membrane including the surface treatment
layer shown in FIG. 1 is cut away.
Sectional drawing of the principal part of the mobile telephone as 2nd Embodiment of this
invention.
Sectional drawing of the principal part of the mobile telephone as 3rd Embodiment of this
invention.
[0010]
First Embodiment FIG. 1 shows a cross-sectional view of the main part of a mobile phone as a
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first embodiment of the present invention.
This mobile phone is provided with a housing 1.
In a predetermined region of one flat plate portion 2 of the housing 1, a sound hole 3 composed
of a plurality of circular holes is provided.
[0011]
An electroacoustic transducer 11 is provided inside the portion of the sound hole 3 of one flat
plate portion 2 of the housing 1.
The electroacoustic transducer 11 is provided with a bottomed cylindrical frame 12 made of
resin. A protrusion 14 having a substantially L-shaped cross section for forming a ring-shaped
drainage groove 13 is integrally provided on an upper portion of the outer peripheral wall
portion of the frame 12. A hydrophilic layer 15 made of a hydrophilic material such as fluorine is
provided on the inner surface of the drainage groove 13. The materials of the hydrophilic layer
described below are the same and thus will not be described.
[0012]
The upper surface of the outer peripheral portion of the projection 14 is attached to the inner
surface of the portion of the sound hole 3 of one flat plate portion 2 of the housing 1 via a ringshaped attachment member 16. In this state, the frame 12 including the projection 14 is attached
to the inner surface of the portion of the sound hole 3 of one flat plate portion 2 of the housing 1
via the attachment member 16. The mounting member 16 has a structure in which double-sided
adhesive tapes 16b and 16c are provided on the upper and lower surfaces of the ring-shaped
cushioning material 16a, respectively. A water repellent layer 17 made of a water repellent
material such as silicone is provided on the inner surface of the mounting member 16. The
materials of the water repellent layer described below are the same and thus will not be
described.
[0013]
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A bottomed cylindrical permanent magnet 21 is fixed to the upper central portion of the bottom
of the frame 12 with an adhesive (not shown). A rod-like yoke 22 is provided at the center of the
upper surface of the bottom of the permanent magnet 21. The outer peripheral portion of the
lower surface of a flat circular vibration film 23 made of polyethylene terephthalate,
polyethylene or the like is fixed to the upper surface of the peripheral wall portion of the frame
12 through an adhesive 24. The upper portion of the voice coil 25 is fixed to the center of the
lower surface of the vibrating membrane 23 via an adhesive (not shown). The voice coil 25 is
vertically movably disposed around the yoke 22 inside the permanent magnet 21.
[0014]
A surface treatment layer 26 for dropping water attached to the upper surface side of the
vibrating film 23 from the outer peripheral edge of the vibrating film 23 is provided on the upper
surface of the vibrating film 23. Here, FIG. 2 shows a plan view in which a part of the vibrating
film 23 including the surface treatment layer 26 is cut away. A plurality of water repelling layers
27 and hydrophilic layers 28 each having a substantially isosceles triangle shape are alternately
provided circumferentially around the center of the vibrating film 23 on the upper surface
excluding the outer peripheral portion of the vibrating film 23. There is.
[0015]
In this case, the apex angle of the water repellent layer 27 is approximately twice the apex angle
of the hydrophilic layer 28. That is, the area of the water repellent layer 27 is almost twice the
area of the hydrophilic layer 28. An outer peripheral portion hydrophilic layer 29 is provided on
the upper surface of the outer peripheral portion of the vibrating membrane 23. Therefore, the
surface treatment layer 26 is composed of the water repellent layer 27, the hydrophilic layer 28
and the outer peripheral hydrophilic layer 29.
[0016]
Here, the electroacoustic transducer 11 includes the frame 12 including the protrusion 14 for
forming the drainage groove 13, the permanent magnet 21, the yoke 22, the voice coil 25, and
the vibrating film 23 including the surface treatment layer 26. It is an electrodynamic type that
uses a magnetic circuit.
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[0017]
Returning to FIG. 1 and continuing the description, a drainage hole 31 consisting of a circular
hole is provided at a predetermined position of one flat plate portion 2 of the housing 1.
A water-repellent layer 32 is provided in a ring shape on the outer surface of one flat plate
portion 2 of the housing 1 around the drainage hole 31. A water repellent layer may be provided
on the outer surface of one flat plate portion 2 of the casing 1 around the sound hole 3.
[0018]
Inside the drainage hole 31, one end of a drainage pipe 33 made of resin, metal or the like is
inserted and attached from the inside of one flat plate portion 2 of the housing 1. A hydrophilic
layer 34 is provided on the inner surface of the drain pipe 33. The other end of the drainage pipe
33 is inserted into and attached to a communication hole 35 provided at a predetermined
position of the projection 13 provided around the frame 12. In this state, the other end of the
drainage pipe 33 is connected to a predetermined position of the bottom of the drainage groove
13.
[0019]
Now, it is assumed that water infiltrates from the sound hole 3 of the housing 1 and the
infiltrated water adheres to the upper surface of the surface treatment layer 26 provided on the
upper surface of the vibrating film 23. Then, the attached water is repelled by the water repellent
layer 27, collected on the hydrophilic layer 28, transmitted along the hydrophilic layer 28 and
guided onto the outer peripheral hydrophilic layer 29, from the outer peripheral edge of the
outer peripheral hydrophilic layer 29. It falls and enters into the drainage groove 13. In this case,
since the area of the water repellent layer 27 is almost twice the area of the hydrophilic layer 28,
the water attached to the upper surface of the surface treatment layer 26 is efficiently repelled
by the water repellent layer 27 and is on the hydrophilic layer 28. Collected. Water that has
entered the sound holes 2 and attached to the inner circumferential surface of the water
repellent layer 17 provided on the inner circumferential surface of the mounting member 16 is
repelled by the water repellent layer 17 and enters the drainage groove 13.
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[0020]
The water that has entered the drainage groove 13 is smoothly transferred toward the
communication hole 35 by the hydrophilic action of the hydrophilic layer 15 provided on the
inner surface thereof. The water transferred to the communication hole 35 is drained to the
outside of the housing 1 through the drain pipe 33 and the drain hole 31. In this case, due to the
hydrophilic action of the hydrophilic layer 34 provided on the inner surface of the drainage pipe
33, the movement of the water flowing in the drainage pipe 33 can be made smooth. Further, the
water discharged from the drainage hole 31 to the outside of the housing 1 can be prevented
from being easily returned to the inside of the drainage hole 31 by the water repellent function
of the water repellent layer 32 provided around the drainage hole 31. As a result, even if water
intrudes from the sound hole 3, the water can not easily adhere to the upper surface side of the
vibrating film 23, that is, the upper surface of the surface treatment layer 26. Can be made
difficult to change.
[0021]
Second Embodiment FIG. 3 shows a cross-sectional view of the main part of a mobile phone as a
second embodiment of the present invention. This mobile phone is different from the mobile
phone shown in FIG. 1 in that the vibrating film 23 is shaped like a mountain in which the central
portion is raised, and the surface treatment layer 26 is provided on the upper surface thereof. In
such a case, the movement of water from the top of the surface treatment layer 26 to the outer
periphery thereof may be smoothed by gravity.
[0022]
Third Embodiment FIG. 4 shows a cross-sectional view of the main part of a mobile phone as a
third embodiment of the present invention. This mobile phone differs greatly from the mobile
phone shown in FIG. 1 in that a piezoelectric electroacoustic transducer 41 using a piezoelectric
film 44 is used instead of the electrodynamic transducer 11 using a magnetic circuit. It is a point.
[0023]
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That is, a disc-shaped shim member 42 made of an elastic member is provided in the middle of
the frame 12. In this case, the outer peripheral surface of the shim 42 is fixed to the inner
peripheral surface of the frame 12 via an adhesive (not shown). A disk-shaped piezoelectric film
44 made of piezoelectric ceramic or the like is fixed to the upper center portion of the shim
member 42 with an adhesive (not shown). The upper central portion of the piezoelectric film 44
and the lower central portion of the vibrating film 23 are connected via a connecting member 44
made of resin, carbon or the like and a double-sided adhesive tape (not shown) provided on the
upper and lower surfaces thereof. .
[0024]
The present invention is applicable not only to mobile phones but also to electronic devices such
as PHS (Personal Handyphone System) and PDA (Personal Data Assistance, Personal Digital
Assistance: personal information communication devices for personal use). be able to.
[0025]
Hereinafter, aspects of the present invention will be collectively described as a supplementary
note.
[0026]
(Supplementary Note 1) The invention of Supplementary Note 1 has a bottomed cylindrical frame
and a vibrating membrane whose lower surface outer peripheral portion is fixed to the upper
surface of the peripheral wall portion of the frame, and the vibrating membrane has the upper
surface A surface treatment layer for dropping water adhering to the upper surface side from the
outer peripheral edge of the vibrating membrane is provided, and a drainage groove is provided
in a peripheral wall portion of the frame. .
[0027]
(Supplementary Note 2) In the invention according to Supplementary Note 2, in the invention
described in Supplementary Note 1, a plurality of the surface treatment layers are provided on
the upper surface excluding the outer peripheral portion of the vibrating film, respectively,
radially around the center of the vibrating film. The electro-acoustic transducer is characterized
by including a water-repellent layer and a hydrophilic layer alternately provided in the
circumferential direction, and an outer peripheral hydrophilic layer provided on the upper
surface of the outer peripheral part of the vibrating film.
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[0028]
(Supplementary Note 3) In the invention according to Supplementary Note 3, the vibrating
membrane has a circular shape, and the water repellent layer and the hydrophilic layer have an
isosceles triangular shape. It is an apparatus.
[0029]
(Supplementary Note 4) The invention according to supplementary note 4 is the electro-acoustic
transducer according to any one of supplementary notes 1 to 3, wherein a hydrophilic layer is
provided on the inner surface of the drainage groove.
[0030]
(Supplementary Note 5) The invention according to Supplementary Note 5 includes a casing
having a sound hole and a drainage hole, a cylindrical frame with a bottom, a vibrating
membrane whose lower surface outer peripheral portion is fixed to an upper surface of a
peripheral wall of the frame, and an upper surface of the vibrating membrane. A surface
treatment layer for dropping water attached to the upper surface side of the vibrating membrane
from the outer peripheral edge of the vibrating membrane, and a drainage groove provided on
the circumferential side portion of the frame; An electro-acoustic transducer provided inside the
sound hole portion of the body, and a drainage pipe provided so as to connect the drainage hole
of the housing and the drainage groove of the electro-acoustic conversion device It is a portable
electronic device characterized by
[0031]
(Supplementary Note 6) The invention according to supplementary note 6 is the portable
electronic device according to supplementary note 5, wherein a hydrophilic layer is provided on
the inner surface of the drainage pipe.
[0032]
(Appendix 7) The invention according to appendix 7 relates to the invention described in
appendix 5 or 6, wherein the frame of the electroacoustic transducer is attached to the inner
surface of the sound hole portion of the housing via a ring-shaped attachment member. A water
repellent layer is provided on the inner peripheral surface of the mounting member.
[0033]
(Supplementary Note 8) The invention according to Supplementary Note 8 is the portable type
characterized in that a water repellent layer is provided on the outer surface of the casing around
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the drainage hole in the invention according to any one of supplementary notes 5 to 7. It is an
electronic device.
[0034]
DESCRIPTION OF SYMBOLS 1 case 2 1 flat part 3 sound hole 11 electroacoustic transducer 12
frame 13 drain 15 hydrophilic layer 16 attachment member 17 water repellent layer 21
permanent magnet 22 yoke 23 diaphragm 25 voice coil 26 surface treatment layer 27 water
repellent layer 28 hydrophilic layer 29 outer peripheral hydrophilic layer 31 drain hole 32 drain
pipe 33 hydrophilic layer 34 water repellent layer 35 communicating hole
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