JP2018116702

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DESCRIPTION JP2018116702
Abstract: The present invention provides an electronic device provided with a piezoelectric
vibrating member capable of making the thickness of the electronic device thinner than
conventional. SOLUTION: A vibration generating member 3 attached to the back surface of a
liquid crystal touch input panel 10 is a conductive diaphragm 30, a surface electrode layer 42
connected to the conductive diaphragm 30, and a piezoelectric element having a surface
electrode layer 42 provided on the surface. A piezoelectric vibrating element 40 having a back
surface electrode layer 46 provided on the back surface of the piezoelectric element 44 and a
circuit board 20 having a surface side wiring pattern 24 including a surface wiring 25 on the
surface fixed to the liquid crystal touch input panel 10; Have. The through conductive portion 21
connecting the back electrode layer 46 of the piezoelectric vibrating element 40 and the front
surface wiring 25 of the circuit board 20 is provided. The penetrating conductive portion 21 is
electrically insulated from the attachment electrode 27 to which the conductive diaphragm 30 is
connected via the conductive bonding layer 32, the conductive diaphragm 30, and the surface
electrode layer 42 of the piezoelectric vibrating element 40, The central portion of the circuit
board 20 and the piezoelectric vibrating element 40 is penetrated. [Selected figure] Figure 2
Electronic device provided with vibration generating member
[0001]
The present invention relates to an electronic device in which a vibration generating member is
attached to the back surface of a panel member.
[0002]
Japanese Patent No. 5421500 (Patent Document 1) discloses an electronic device which is
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provided with a vibrating portion on the back surface side of a panel member, vibrates this
vibrating portion in a predetermined mode, and transmits this vibration to the panel member.
There is.
[0003]
Moreover, the electronic device which vibrates a panel member is disclosed by UnexaminedJapanese-Patent No. 2005-510815 (patent document 2) using a piezoelectric vibration member
for a vibration part.
[0004]
Further, Japanese Patent No. 4426738 (Patent Document 3) discloses an electronic apparatus
(piezoelectric speaker system) in which an audible sound is generated from a panel member
vibrated by a piezoelectric vibrating member to make the panel member a speaker.
[0005]
Patent No. 5421500 Japanese Patent Application Laid-Open No. 2005-510815 Patent No.
4426738
[0006]
In conventional electronic devices that vibrate panel members, there is always a desire to reduce
the thickness of the entire device.
However, the structure of the electronic device using the conventional piezoelectric vibration
member as a vibration source can not meet this demand.
[0007]
An object of the present invention is to provide an electronic device provided with a piezoelectric
vibrating member capable of making the thickness of the electronic device thinner than
conventional.
[0008]
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An electronic device to be improved by the present invention is an electronic device provided
with a panel member, a vibration generating member attached to the back surface of the panel
member to vibrate and a vibration control unit for controlling the vibration of the vibration
generating member. It is.
In the present invention, the vibration generating member includes a conductive diaphragm, a
surface electrode layer electrically connected to the conductive diaphragm, a piezoelectric
element having a surface electrode layer provided on the surface, and a surface electrode on the
back surface of the piezoelectric element. A plurality of piezoelectric vibrating elements having a
back electrode layer provided so as to face the layer, and conductivity of the plurality of
piezoelectric vibrating elements having a front side wiring pattern on the surface fixed to the
panel member A circuit board having a back side wiring pattern including a plurality of
attachment electrodes connected with a diaphragm via a conductive bonding layer, a conductive
diaphragm and a surface electrode layer of a piezoelectric vibrating element, and an attachment
electrode of the circuit board electrically In the insulated state, the circuit board and the central
portion of the piezoelectric vibration element are penetrated, and a through connection structure
portion connecting the back electrode layer of the piezoelectric vibration element and the surface
electrode layer of the circuit board is provided.
[0009]
According to the present invention, since the through connection structure portion is provided, in
order to connect the back surface electrode layer of the piezoelectric vibration element and the
surface electrode layer of the circuit board, it is necessary to provide the lead wire for connection
outside the piezoelectric vibration element It disappears.
As a result, the electronic device can be made thinner than before.
[0010]
When the panel member is a touch input panel member with which the user touches the surface,
the vibration control unit causes the vibration generating member to vibrate at a frequency that
does not generate an audible sound from the touch input panel, thereby causing a touch in
conjunction with the touch. Since the input panel member can be vibrated, only a click can be
given to the person making the touch.
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[0011]
When the panel member is a display panel member that displays an image or a video, the
vibration control unit vibrates the vibration generating member at a frequency that generates an
audible sound from the display panel to use the display panel member as a speaker. can do.
[0012]
The outer peripheral contours of the conductive diaphragm, the front electrode layer, the
piezoelectric element and the back electrode layer may have a concentric disk shape.
If such a configuration is adopted, a piezoelectric vibrating member can be configured at low cost
using a piezoelectric vibrating element that can be used for an existing piezoelectric buzzer or
the like.
[0013]
In the mounting electrode, the conductive diaphragm, and the surface electrode layer, the
through connection structure and the main body of the mounting electrode, the main body of the
conductive diaphragm, and the main surface of the surface electrode layer are electrically
separated around the through connection structure. Annular separation grooves are formed
respectively.
When such a configuration is adopted, it is possible to reliably prevent the occurrence of a short
circuit when forming the through connection structure.
[0014]
It is preferable that a plurality of through holes or through grooves into which the bonding agent
forming the conductive bonding layer enters are dispersedly formed in the main body portion of
the mounting electrode.
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According to this structure, the bonding agent can be introduced into the dispersed through
holes or through grooves to enhance the bonding strength.
[0015]
When a multilayer circuit board having an internal wiring pattern inside is used as a circuit
board, it is preferable that a ground conductive layer is further provided on the back surface of
the multilayer circuit board via an insulating layer.
When such a ground conductive layer is provided, the conductive layer exhibits a shielding
effect.
[0016]
The touch input panel member may be an electrostatic touch input panel.
[0017]
When the plurality of mounting electrodes of the circuit board are arranged to form a plurality of
electrode rows and two or more electrode rows, the vibration control unit is configured to keep
the touch input panel member touched for a predetermined time for the same time. The
operation of vibrating a plurality of piezoelectric vibrating elements included in an electrode row
in the same phase and vibrating a plurality of piezoelectric vibrating elements included in an
adjacent other electrode row in a phase opposite to the same phase is phased every fixed cycle
Can be changed.
Thus, the touch input panel member can be vibrated as a whole.
[0018]
Further, in the case where the plurality of attachment electrodes of the circuit board are
arranged to form a plurality of electrode rows and two or more electrode rows, the vibration
control unit causes a predetermined change when the user touches the touch input panel
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member. The operation of driving the plurality of piezoelectric vibrating elements can be
performed with the phase being changed at a constant cycle so that two piezoelectric vibrating
elements adjacent in time, row direction or column direction vibrate in opposite phases.
Thus, the touch input panel member can be vibrated as a whole.
[0019]
What is used as a speaker is an in-phase drive mode in which the sound pressure is maximized.
There is a certain degree of vibration, and the small sound is the two-row drive mode in which
the phase of the two rows is alternated. The drive mode may be selected according to the
application.
[0020]
As described above, according to the electronic device provided with the vibration generating
member according to the present invention, since the through connection structure portion is
provided, the thickness of the electronic device can be thinner than in the conventional case.
[0021]
FIG. 2 is a cross-sectional view showing a layered configuration of an embodiment of an
electronic device provided with a vibration generating member according to the present
invention, and dimensions such as thickness of each layer are appropriately changed for the sake
of description (FIG. 2) The same goes for the following).
It is an expanded cross-sectional view of the electronic device of FIG. It is the cross-sectional view
which further expanded the circuit board part of embodiment of the electronic device provided
with the vibration generation member of this invention. (A), (B) and (C) respectively show a
perspective view and an exploded perspective view of a state in which a part of the vibration
generating member including the piezoelectric vibrating element of FIG. It is a disassembled
perspective view. (A) is a cross-sectional view similar to FIG. 3 of the circuit board part in other
embodiment of this invention, (B) is a cross-sectional view of the modification of FIG. 5 (A). (A),
(B), (C) and (D) respectively show a perspective view and an exploded perspective view of a state
in which a part of a vibration generating member including another piezoelectric vibrating
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element is cut from the back side, and They are the disassembled perspective view seen from the
side, and the perspective view seen from the surface side. It is a figure which shows the example
which arrange ¦ positioned several piezoelectric vibration elements on the circuit board. (A) And
(B) is a vibration distribution figure of the touch input panel member at the time of driving the
embodiment of FIG. 1 using the circuit board of FIG. 7 by waveform drive mode. (A) And (B) is a
vibration distribution figure of the touch input panel member at the time of driving the
embodiment of FIG. 1 using the circuit board of FIG. 7 by a zigzag drive mode.
[0022]
Hereinafter, an embodiment of an electronic device provided with a vibration generating member
according to the present invention will be described in detail with reference to the drawings. FIG.
1 is a cross-sectional view showing the configuration of an electronic device 1 equipped with a
vibration generating member according to the present invention. Specifically, this electronic
device is a portable terminal such as a notebook computer, and FIG. It is a cross section of a
display part. FIG. 2 shows a cross-sectional view of the main part of the piezoelectric vibrating
member 3. In FIG. 1 and FIG. 2, hatching indicating that it is a cross section is omitted.
[0023]
In FIG. 1, the liquid crystal touch input panel 10 is exposed on the surface of the electronic
device, and the circuit board 20, the conductive diaphragm 30, and the piezoelectric vibrating
element 40 are sequentially stacked from the surface side in the lower layer on the back side.
The configured vibration generating member 3 is configured. The liquid crystal touch input panel
10 has a capacitive touch switch function. The vibration generating member 3 is attached to the
back surface of the liquid crystal touch input panel 10 so as to be able to transmit the vibration
to the liquid crystal touch input panel 10.
[0024]
A plate-shaped damper 11 is provided below the vibration generating member 3, a metal bottom
plate 12 is provided below the plate-like damper, and a synthetic resin base 13 is provided below
the vibration generating member 3 to form a housing of the electronic device together with the
frame 15. There is. Protruding dampers 14 are provided on the plate-like dampers 11 so as to
protrude upward, and in each of the dampers 11 and 14, the liquid crystal touch input panel 10
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is excessively deformed or the vibration generating member is rapidly vibrated by an external
force. To prevent the occurrence of damage or accidents caused by The thickness of the frame
15 is adjusted so that the gaps in the stacking direction of the dampers 11 and 14 have
appropriate sizes.
[0025]
The conductive diaphragm 30 of the vibration generating member 3 is a thin plate made of
brass, and a vibration control unit (not shown) generates an output signal to transmit the
vibration to the liquid crystal touch input panel 10 when the piezoelectric vibration element 40
vibrates. .
[0026]
In the present embodiment, the liquid crystal touch input panel 10 is a display panel / touch
input panel, and the vibration control unit (not shown) vibrates the vibration generating member
3 at a frequency that does not generate an audible sound from the liquid crystal touch input
panel 10. In conjunction with the touch, the liquid crystal touch input panel 10 is vibrated to give
a click feeling to the person making the touch.
When the vibration control unit vibrates the vibration generating member 3 at a frequency that
generates an audible sound from the liquid crystal touch input panel 10, the liquid crystal touch
input panel 10 can be used as a speaker.
[0027]
As shown in FIG. 2, the piezoelectric vibrating element 40 is provided on the piezoelectric
element 44, the surface electrode layer 42 provided on the front side of the piezoelectric element
44, and the back surface of the piezoelectric element 44 so as to face the surface electrode layer
42. And the back electrode layer 46. The front electrode layer 42 is electrically connected to the
conductive diaphragm 30. The piezoelectric element 44 is made of lead zirconate titanate (PZT),
and the front electrode layer 42 and the back electrode layer 46 are formed by screen printing
silver paste on both sides of the piezoelectric element 44 or depositing silver. .
[0028]
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In the present embodiment, the circuit board 20 is configured by forming a copper foil wiring
pattern on both sides of the plate-like insulating layer 22. That is, the wiring patterns on both
sides are the surface wiring pattern 24 printed on the surface fixed to the liquid crystal touch
input panel 10 and the back surface wiring pattern to which the conductive diaphragms 30 of
the plurality of vibration generating units 3 are connected 26. The back side wiring pattern 26
and the conductive diaphragm 30 are connected via a conductive bonding layer 32 made of a
conductive bonding material.
[0029]
Referring to the enlarged cross-sectional view shown in FIG. 3, a plurality of attachment
electrodes 27 are formed on the back side wiring pattern 26. The mounting electrode 27 is
connected to the conductive diaphragm 30 via the conductive bonding layer 32, and is further
electrically connected to the surface electrode layer 42 of the piezoelectric vibrating element 40.
As shown in FIGS. 2 and 4B, the mounting electrode 27 is formed with a plurality of through
holes h dispersed. The plurality of through holes h are formed by etching of a copper foil.
According to such a structure of the mounting electrode 27, the conductive bonding material
enters the dispersed through holes h, and the bonding strength between the mounting electrode
27 and the conductive diaphragm 30 can be enhanced.
[0030]
As shown in FIG. 3, the portion of the back side wiring pattern 26 other than the attachment
electrode 27 constitutes a back electrode lead 28. The back surface electrode lead 28 is
connected to the back surface electrode layer 46 of the piezoelectric vibrating element 40
through the penetration conductive portion 29, the surface wiring 25, and the penetration
conductive portion 21 constituting the penetration connection structure portion.
[0031]
The through conductive portion 21 shown in FIGS. 2 and 3 is formed by filling the through holes
50 with a conductive paste or the like, and reaches the back surface electrode layer 46 of the
piezoelectric vibrating element 40 from the surface wiring 25 of the circuit board 20. The back
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surface electrode layer 46 and the surface wiring 25 of the circuit board 20 are connected. The
through hole 50 passes through the circuit board 20, the conductive diaphragm 30, and the
central portion of the piezoelectric vibrating element 40, and the through conductive portion 21
passes through the through hole.
[0032]
A ground conductive layer 23 is formed in a portion other than the surface wiring 25 of the
surface side wiring pattern 24. When such a ground conductive layer 23 is provided, the ground
conductive layer 23 exhibits a shielding effect.
[0033]
The vibration control unit is connected to the back surface electrode lead 28 and the mounting
electrode 27 and vibrates the piezoelectric vibration element 40 by applying a drive voltage of a
predetermined frequency between the front surface electrode layer 42 and the back surface
electrode layer 46. . Thereby, the liquid crystal touch input panel 10 is vibrated through the
conductive diaphragm 30 and the circuit board 20. The operator's touch on the liquid crystal
touch input panel 10 is detected by a change in capacitance and is input to the vibration control
unit.
[0034]
As shown in FIG. 4, the outer peripheral contours of the conductive diaphragm 30, the surface
electrode layer 42, the piezoelectric vibrating element 40 and the back electrode layer 46 have a
concentric disk shape. If such a configuration is adopted, the piezoelectric vibrating member 3
can be configured at low cost using a piezoelectric vibrating element that can be used for an
existing piezoelectric buzzer or the like.
[0035]
Further, as shown in FIGS. 4A to 4C, in the mounting electrode 27, the conductive diaphragm 30,
and the surface electrode layer 42, the through conductive portion 21 (shown in FIGS. 2 and 3) is
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formed around the through hole 50. (Not shown in FIG. 4), annular separation grooves 52, 54
and 56 for electrically separating the main body of the mounting electrode 27, the main body of
the conductive diaphragm 30, and the main body of the surface electrode layer 42. Are formed
respectively. By adopting such a configuration, it is possible to prevent the occurrence of a short
circuit even if the penetrating conductive portion 21 is formed.
[0036]
FIG. 5A shows a cross-sectional view of a circuit board portion in another embodiment of the
present invention. The circuit board portion shown in FIG. 5A performs the same function as the
circuit board portion shown in FIG. 3 and is compatible as a constituent member of the vibration
generating member. The circuit board 60 includes three insulating layers, that is, a surface
insulating layer 62, an intermediate insulating layer 64, and a back surface insulating layer 66 in
order from the front surface side. Wiring patterns are provided on both surfaces of each
insulating layer and between layers, the surface of the surface insulating layer 62 is the ground
conductive layer 70, and the surface insulating layer 62 and the intermediate insulating layer 64
are the surface side wiring pattern 71, the intermediate insulating layer An intermediate wiring
pattern 72 is located between the back surface insulating layer 66 and the back surface
insulating layer 66, and the back surface side wiring pattern 73 is the back surface of the back
surface insulating layer 66. A mounting electrode 74 and a back surface electrode lead 75 are
formed on the back surface side wiring pattern 73. The back surface electrode lead 75 is
connected to the back surface electrode layer 46 of the piezoelectric vibrating element 40
through the penetration conductive portion 76, the surface wiring 77 of the surface side wiring
pattern 71, and the penetration conductive portion 78. As shown in FIG. 5B, the ground
conductive layer 70 of the circuit board portion of FIG. 5A may be removed.
[0037]
As shown in FIGS. 6A to 6D, the mounting electrode 74 has a slightly larger disc shape concentric
with the outer peripheral contours of the conductive diaphragm 30 and the piezoelectric
vibrating element 40, and penetrates around the penetrating conductive portion 78. An annular
separation groove 79 is formed to electrically separate the conductive portion 78 and the main
portion of the attachment electrode 74.
[0038]
Next, application to a portable terminal such as a notebook computer which is an electronic
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device according to the present embodiment will be described.
On the surface of the liquid crystal touch input panel 10, which is a display of a notebook
computer, buttons, keys, images and the like for the user to perform input by touching are
displayed. A vibration control unit interlocked with a central control unit (not shown) of the
personal computer that performs this display detects a position touched by the user on the
electrostatic capacitance type liquid crystal touch input panel 10 from a change in electrostatic
capacitance. Then, the central control unit is informed of information on the touched location,
and the vibration control unit receives an instruction from the central control unit to vibrate each
piezoelectric vibrating element 40, and liquid crystal touch input via the conductive diaphragm
30 and the circuit board 20 The panel 10 is vibrated.
[0039]
If the frequency for vibrating the liquid crystal touch input panel 10 is low enough not to
generate an audible sound, the clicker is given a click feeling, and if it is high enough to generate
an audible sound, the clicker is supplied to the toucher . If the portion touched is an error or a
portion which can not be operated, in the present embodiment, there is an error or invalid
operation in the user by giving a click feeling or a warning sound different from the case of the
correct touch. Can be set to notify the user. In addition, based on the user's operation, the
generation of the vibration can be stopped to mute the click sound, or the strength of the click
feeling can be selected.
[0040]
When a plurality of attachment electrodes 27 are provided as in the present embodiment, the
click feeling and the click sound are adjusted by the phase of the alternating current voltage
applied to each attachment electrode 27 so that the alternating current voltage of the same
frequency is obtained. The magnitude of vibration and sound pressure can be varied.
[0041]
Assuming that a plurality of mounting electrodes are arranged to form a matrix of 5 rows × 2
columns as shown in FIG. 7 and 10 piezoelectric vibrating elements 40 are attached, the
vibration control unit causes the touch input panel 10 to receive a user When is touched, a
plurality of piezoelectric vibrating elements included in the same electrode row are vibrated in
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the same phase for a predetermined time, and a plurality of piezoelectric vibrating elements
included in another adjacent electrode row are vibrated in the opposite phase to the same phase
The operation can be performed by changing the phase every fixed period.
When driven in such a waveform drive mode, as shown in FIG. 8, the touch input panel 10 can be
vibrated as a whole, and both the vibration and the sound pressure are maximized. The waveform
drive mode is suitable for the vibration of the touch input panel (generation of click feeling).
[0042]
In addition, the vibration control unit drives the plurality of piezoelectric vibrating elements so
that two piezoelectric vibrating elements adjacent in the row direction or the column direction
vibrate in opposite phases for a predetermined time when the user touches the touch input
panel. The eight piezoelectric vibration elements 40 can be driven in the staggered drive mode in
which the phase is changed at predetermined intervals. When eight piezoelectric vibrating
elements 40 are driven in such a staggered drive mode, the touch input panel 10 can be vibrated
as a whole as shown in FIGS. 9A and 9B. In this zigzag drive mode, the vibration is small and the
sound pressure is also small, so it is suitable for applications where a click feeling is generated in
a quiet state.
[0043]
In the in-phase drive mode in which all the piezoelectric vibrating elements 40 are driven in the
same phase, the sound pressure is the largest, and so is suitable for use as a speaker. In the tworow drive mode in which the phases of the two rows of piezoelectric vibrating elements are
alternately changed, the vibration is to some extent and the sound is small. As described above,
when a plurality of attachment electrodes are arranged in a matrix, each drive mode can be
selected according to the application.
[0044]
As described above, according to the electronic device of the present embodiment, since the
through connection structure (the through hole 50, the through conductive portion 21, and the
through conductive portion 78) is provided, the back electrode layer 46 of the piezoelectric
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vibrating element 40 and the circuit are provided. In order to electrically connect the surface
wiring 25 of the substrate 20, it is not necessary to provide a connecting lead wiring on the
outside of the piezoelectric vibrating element 40. As a result, the electronic device can be made
thinner than before.
[0045]
DESCRIPTION OF SYMBOLS 10 Liquid crystal touch input panel 20 Circuit board 22 Insulating
layer 21 Penetration conductive part (penetration connection structure part) 24 surface side
wiring pattern 25 surface wiring 26 back surface side wiring pattern 27 mounting electrode 28
back surface electrode lead 30 electroconductive diaphragm 32 electroconductive joining layer
40 piezoelectric vibrating element 42 front electrode layer 44 piezoelectric element 46 back
electrode layer 50 through hole 52, 54, 56 separation groove
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