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JPWO2016056500

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DESCRIPTION JPWO2016056500
Abstract: To provide an electronic device capable of generating stable vibration in the entire
panel. In an electronic device (1) comprising a substantially rectangular panel (20), a housing
(10) for holding the panel (20), and a piezoelectric element (30) attached to the back side of the
panel (20) Is bonded to the housing 10 in a state of being supported by the housing 10, and has
at least one side (non-adhesive side) 21 that is not bonded to the housing 10. [Selected figure]
Figure 1
Electronics
[0001]
The present invention relates to an electronic device provided with a piezoelectric element.
[0002]
2. Description of the Related Art Conventionally, in electronic devices such as mobile phones and
multi-functional mobile communication terminals called smart phones, piezoelectric elements
called piezoelectric speakers are used as sound generation elements for voice output.
In the conventional electronic device, the piezoelectric element is disposed in the housing, and
the housing is provided with a sound transmission hole for transmitting the sound as air
conduction sound to the outside. On the other hand, in recent years, a technology has been
proposed in which a piezoelectric element is attached to the back surface of a panel disposed on
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the main surface of a housing, and sound is transmitted by vibrating the panel. Such a technology
has a desire to eliminate sound transmission holes in order to improve waterproofness, a desire
to transmit voice as bone conduction sound as well as airborne sound mediated by air, and panel
vibration. It is proposed from the desire etc. to implement the haptic technology transmitted as a
sense of touch. Here, the panel does not include a display function, and includes a touch panel
having only a touch function, a touch panel having a display function and a touch function, and a
protective panel for protecting a separately provided display device such as a liquid crystal
display device.
[0003]
As a conventional electronic device adopting such a technology, the one described in Patent
Document 1 is known. The thing of patent document 1 is provided with the housing | casing, the
substantially rectangular panel by which the edge part was supported by the housing | casing,
and the substantially rectangular parallelepiped-shaped piezoelectric element attached to the
back surface of the panel. The piezoelectric elements are attached in a direction in which the
longitudinal direction is orthogonal to the longitudinal direction of the panel, and in particular, at
a position where the vibration amplitude of the panel is maximized at the attached position of the
piezoelectric elements. A specific attachment position of the piezoelectric element is in the
vicinity of one end in the longitudinal direction of the panel.
[0004]
Patent No. 5255142 gazette
[0005]
However, in the case of the above-mentioned patent document 1, since the piezoelectric element
is attached near the end of the panel so that the vibration amplitude of the panel at the
attachment position is maximized, the air conduction noise is The points where the sound
pressure is high are concentrated only in the vicinity of the panel end, and the sound pressure
particularly in the vicinity of the center decreases.
For this reason, there is a problem that it is difficult to listen if the ear is not placed in the correct
position when the use of the phone is considered. In addition, there is also a problem that the
sound quality is not stable when using at a position away from the ear like an audio speaker
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2
instead of putting an ear on the electronic device. Furthermore, in the case of using a
piezoelectric element as haptic technology, the amount of vibration greatly differs between the
end portion and the central portion of the panel, so there is a problem that the tactile sensation
provided to the user is not stable depending on the position.
[0006]
The present invention has been made in view of the above-described circumstances, and an
object thereof is to provide an electronic device capable of generating stable vibration in the
entire panel.
[0007]
In order to achieve the above object, the present invention relates to an electronic device
comprising a substantially rectangular panel, a housing for holding the panel, and a piezoelectric
element attached to the back side of the panel, the panel having an edge The apparatus is
characterized in that it is adhered to the case in a state supported by the case and has at least
one side (non-adhesioned side) which is not adhered to the case.
[0008]
According to the present invention, since the vibration amplitude of the panel is maximized on
the central portion side with respect to the attachment position of the piezoelectric element,
stable vibration can be generated in the entire panel.
[0009]
As an example of the suitable aspect of this invention, the said piezoelectric element is
characterized by being attached by the vicinity of the said non-adhesive side of a panel.
Further, as another example of the preferred embodiment of the present invention, the
piezoelectric element has a substantially rectangular parallelepiped shape, and is attached to the
panel so that the longitudinal direction is parallel to the non-adhesive side. Can be mentioned.
Moreover, as another example of the suitable aspect of this invention, the said non-adhesive side
is a short side of a panel, What is characterized by the above-mentioned is mentioned.
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Further, as another example of the preferable embodiment of the present invention, a nonadhesion area which is not adhered to the housing is formed on a side (adhesion side) adhered to
the housing. What is to be mentioned. Further, as another example of the preferable embodiment
of the present invention, one characterized in that a non-adhesion region is formed at the
longitudinal center of the adhesion side. Another example of the preferred embodiment of the
present invention is characterized in that the non-adhesive area is adjacent to the non-adhesive
side.
[0010]
As described above, according to the present invention, the vibration amplitude of the panel is
maximized on the central portion side with respect to the attachment position of the piezoelectric
element, so that stable vibration can be generated in the entire panel.
[0011]
Schematic top view of the electronic device Schematic top view of the electronic device with the
panel removed Cross section of the electronic device Graph of measurement of vibration
amplitude of the panel of the electronic device Schematic top view of the electronic device
according to another example with the panel removed Top view of the electronic device
according to the other example
[0012]
An electronic device according to an embodiment of the present invention will be described with
reference to the drawings.
FIG. 1 is a schematic top view of the electronic device, FIG. 2 is a schematic top view of the
electronic device from which the panel is removed, and FIG. 3 is a cross-sectional view of the
electronic device.
In the present embodiment, a multifunctional mobile communication terminal called a so-called
smart phone will be described as an example of the electronic device.
[0013]
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As shown in FIGS. 1 to 3, the electronic device 1 has a thin box-like housing 10 with an upper
opening, a panel 20 for closing the upper opening of the housing 10, and a back surface of the
panel 20, that is, the inner side of the housing 10. And a piezoelectric element 30 attached
thereto.
[0014]
The housing 10 is in the form of a thin box having a top opening, which comprises a bottom
plate 11 and a frame 12 surrounding the edge of the bottom plate 11.
As shown in FIGS. 2 and 3, a step 13 for holding the edge of the panel 20 is formed on the upper
inner side of the frame 12. The depth of the step 13 is approximately equal to the sum of the
thickness of the panel 20 and the thickness of an adhesive member described later so that the
upper surface of the panel 20 and the upper surface of the frame 12 are flush.
[0015]
The panel 20 is a touch panel incorporating only a touch function for detecting a touch, a liquid
crystal touch panel incorporating a display function such as a touch function and a liquid crystal
display function, or a liquid crystal display device disposed in the housing 10 without
incorporating a touch function. Etc. is a protection panel that protects the display device. The
panel 20 has a rectangular plate-like member as a main component. The planar shape of the
panel 20 is a rectangle which is the same as or slightly smaller than the inner surface of the
frame 12. As a main material of the panel 20, various materials such as glass and acrylic can be
used. The front face of the panel 20 may be flat or curved.
[0016]
The edge of the panel 20 is adhered to the upper surface of the step 13 of the frame 12 by an
adhesive member. One of the characteristic points of the present invention is that the edge of at
least one of the four sides of the panel 20 is not bonded to the step 13, in other words, it is in a
non-bonded state. In the present embodiment, the pair of short sides 21 and 22 of the panel 20
are non-bonded sides not bonded to the step 13. On the other hand, the pair of long sides 23 and
24 of the panel 20 is a bonding side bonded to the step 13.
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[0017]
Here, the long sides 23 and 24 of the panel 20 are not bonded to the step 13 at all edges, but
only a part of the area is bonded and the other areas are non-bonded areas. Specifically, as
shown in FIG. 2, two adhesive members 41 and 42 and 43 and 44 made of an adhesive or
double-sided tape are disposed on the long sides 23 and 24, respectively. The bonding members
41 and 43 and the bonding members 42 and 44 are disposed at a predetermined distance. That
is, in the long sides 23 and 24, the gap area between the bonding members 41 and 43 and the
bonding members 42 and 44 is a non-bonding area. The non-adhesive area is located at the
center of the long sides 23 and 24. Moreover, in the long sides 23 and 24, the area | region at
the side of the short sides 21 and 22 of each adhesion member 41-44 is also a non-adhesion area
| region. Therefore, this non-adhesive area is adjacent to the edge at the short sides 21 and 22. In
addition, in FIGS. 2 and 3, it should be noted that the bonding members 41 to 44 are hatched
from the viewpoint of the visibility of the drawings.
[0018]
The piezoelectric element 30 has a substantially rectangular parallelepiped shape. The
piezoelectric element 30 can be of various types such as a bimorph type, a unimorph type, and a
laminated type. In the present embodiment, a laminated piezoelectric element is used. The
piezoelectric element 30 is used for vibration of the panel 20 to transmit sound by air conduction
sound or bone conduction sound as well as application of transmitting vibration of the panel 20
as touch.
[0019]
The piezoelectric element 30 is bonded on the back side of the panel 20 by an adhesive, an
adhesive member (not shown) such as a double-sided tape. The longitudinal direction of the
piezoelectric element 30 is orthogonal to the longitudinal direction of the panel 20, and the
longitudinal center position is located at the lateral center of the panel 20. Further, in the present
invention, the piezoelectric element 30 is disposed in such a manner that one of the short sides
21 and 22 and one longitudinal side of the piezoelectric element 30 are parallel in the vicinity of
the short sides 21 and 22 which are non-bonding sides. There is. In the present embodiment, as
shown in FIG. 2 and FIG. 3, they are arranged in the vicinity of one short side 21 of the panel 20.
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The distance between the side surface of the piezoelectric element 30 and the short side 21 (the
distance between the panel side and the side closer to the panel side of the piezoelectric element)
is preferably about 0.3 to 12 mm.
[0020]
The graph which measured the vibration amplitude of the panel 20 of the electronic device 1
which concerns on FIG. 4 at this Embodiment is shown. Here, the piezoelectric element 30 used
had a width of 6 mm, a length of 53 mm, and a thickness of 0.3 mm. The distance between the
side surface of the piezoelectric element 30 and the short side 21 of the panel 20 was 5 mm.
Moreover, the panel 20 used tempered glass 64 mm long, 133 mm wide, and 0.55 mm in
thickness. The width of the step 13 of the frame 12 of the panel 20 was 1 mm, and the width of
the bonding members 41 to 44 was the same as the width of the step 13. Further, in FIG. 4, a
sine wave signal of 1500 Hz at 20 Vp-p and a sine wave signal of 3400 Hz at 20 Vp-p are input
to the piezoelectric element 30.
[0021]
In the graph of FIG. 4, the vertical axis represents the vibration amplitude [nm], and the
horizontal axis represents the measurement position. The measurement position is indicated by
the distance [mm] from the short side 21 of the panel 20. A laser Doppler velocimeter was used
for the measurement.
[0022]
As shown in FIG. 4, in the piezoelectric element 30 according to the present embodiment, the
position at which the vibration amplitude on the surface of the panel 20 due to the vibration of
the piezoelectric element 30 is maximum is not directly above the piezoelectric element 30 but
attached to the piezoelectric element 30. It turned out that it is located in the longitudinal center
direction of panel 20 rather than position. As a result, since the sound generation points are not
concentrated on a part of the panel 20 but sound is generated from a wide range, it has been
found that stable vibration can be generated in the entire panel.
[0023]
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The embodiment of the present invention has been described in detail, but the present invention
is not limited to this. For example, in the above embodiment, the adhesive members 41 and 42
and 43 and 44 are disposed such that only a partial region is adhered to the long sides 23 and
24 and the other region is a non-adhesive region. However, other forms are possible. For
example, as shown in FIG. 5, the adhesive members 41 and 42 and 43 and 44 may be formed
over the adjacent short sides 21 and 22, respectively. In this case, only the gap between the
bonding members 41 and 43 and the bonding members 42 and 44 is a non-bonding area.
Alternatively, as shown in FIG. 6, the adhesive members provided on the long sides 23 and 24
may be only 41 and 43. Alternatively, three or more adhesive members may be provided on each
of the long sides 23 and 24. Alternatively, the entire area of the long sides 23 and 24 may be
used as the adhesion area.
[0024]
Further, in the above embodiment, the short side 22 where the piezoelectric element 30 is not
adjacent is not bonded to the step 13 of the frame 12, but the short side 22 may be bonded to
the step 13. In this case, the form of the adhesive member can be arbitrarily selected in the same
manner as the adhesive members at the long sides 23 and 24. That is, only a partial region of the
short side 22 may be adhered, or all the regions may be adhered.
[0025]
Furthermore, although only one piezoelectric element 30 is attached to the panel 20 in the above
embodiment, two or more may be attached. For example, when two piezoelectric elements 30 are
attached, one piezoelectric element 30 is attached at the above-described position, and the other
piezoelectric element 30 is attached at a position that is symmetrical to the piezoelectric element
30 with reference to the center point of the panel 20 Then, it is suitable.
[0026]
Furthermore, in the above embodiment, a smartphone is described as an example of the
electronic device, but the present invention can be applied to various electronic devices such as a
tablet terminal, a notebook computer, a mobile phone, a wrist watch, a photo stand, a remote
controller of various devices and an operation unit.
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[0027]
DESCRIPTION OF SYMBOLS 1 ... Electronic device, 10 ... Housing | casing 11 11 Bottom plate 12
Frame 13 Difference in level 20 Panels 21, 22 Short side 23, 24 Long side 30 Piezoelectric
element 41 to 44 Adhesive member
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