JP2014057264A - Portable telephone - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable telephone which prevents cracks of a piezoelectric element while unfailingly transmitting vibrations of the piezoelectric element to a cover panel.SOLUTION: A rectangular piezoelectric element 12 extending to left and right sides is incorporated into a piezoelectric receiver 10. The piezoelectric receiver 10 is adhered to a rear surface of a plate like cover panel 2a covering a surface of a liquid crystal display with a pair of double sided tape 11 which are spaced away from each other in a horizontal direction.

Description

  The present invention relates to a mobile phone having a piezoelectric receiver above a display unit.

  Conventionally, it is known to transmit the vibration to a panel member using a piezoelectric element. For example, as in Patent Document 1, an acoustic member contact-type information input function is provided, and a low-rigidity portion with reduced rigidity is formed at least at a peripheral portion, and the vibration element is provided at the center side including the low-rigidity portion. The panel member which has is known.

  If the call receiver is made up of a piezoelectric receiver, the piezoelectric element contained in it is vibrated and the signal is transmitted to the cover panel, the piezoelectric receiver must be attached to the back of the cover panel. Since vibration cannot be transmitted to the cover panel, almost the entire back surface of the piezoelectric receiver is in close contact with the double-sided tape.

JP 2010-157037 A

  However, in the case where the piezoelectric element has a rectangular shape that is long to the left and right, there is a problem in that if the cover panel is subjected to a stress to bend left and right, the piezoelectric element bends and breaks following the cover panel.

  The present invention has been made in view of such a point, and an object thereof is to prevent cracking of the piezoelectric element while reliably transmitting the vibration of the piezoelectric element to the cover panel.

  In order to achieve the above object, according to the present invention, an interval is provided at the left and right center of the double-sided tape to which the piezoelectric receiver is attached.

Specifically, in the first invention,
A cellular phone having a piezoelectric receiver for telephone call above a display portion is an object.

A plate-like cover panel covering the surface of the display unit;
A housing to which the cover panel is attached;
A piezoelectric receiver having a piezoelectric element bonded to the back surface of the cover panel;
The piezoelectric receiver includes a rectangular piezoelectric element extending to the left and right,
The piezoelectric receiver is attached to the back surface of the cover panel with a pair of double-sided tapes spaced apart from each other on the left and right.

  According to the above configuration, since the piezoelectric receiver is attached to the cover panel with a pair of double-sided tape with a gap in the left and right center of the piezoelectric receiver, when a force to bend the cover panel left and right is applied, The gap part does not bend following the cover panel that is bent. For this reason, the piezoelectric element is difficult to break. Note that the vibration of the piezoelectric element can be sufficiently transmitted to the cover panel by adjusting the size of the gap.

In the second invention, in addition to the first invention,
The left and right lengths of the pair of double-sided tapes are substantially equal to the distance between the pair of double-sided tapes.

  According to the above configuration, the gap portion of the double-sided tape is not made too large, and is approximately equal to the length of each of the pair of double-sided tapes, so that the vibration of the piezoelectric element is appropriately transmitted to the cover panel and functions as a receiver. The piezoelectric element can be prevented from cracking even if a force to bend left and right is applied to the cover panel while securing the piezoelectric element. Note that “substantially equal” does not mean that they are completely equal, but allows some errors.

In the third invention, in addition to the first or second invention,
A cushion member is bonded between the opposite side between the pair of double-sided tapes in the piezoelectric receiver and the housing.

  According to the above configuration, the piezoelectric element is prevented from being pulled in the strain direction even when the cover panel is distorted by attaching the opposite side of the cover panel to the housing side via the cushion member.

  As described above, according to the present invention, the piezoelectric receiver is attached to the back surface of the cover panel with a pair of double-sided tapes spaced from each other on the left and right sides, so that the vibration of the piezoelectric element is reliably transmitted to the cover panel. It is possible to prevent the element from cracking.

It is sectional drawing which shows the outline of the piezoelectric receiver affixed on the cover panel, (a) shows the time of affixing, and (b) shows the time of bending stress. 1 is a perspective view showing a mobile phone according to an embodiment of the present invention. It is the disassembled perspective view which looked at the mobile telephone from the back side. It is a front view which shows a mobile telephone when a cover panel is removed. It is side sectional drawing which shows a mobile telephone. It is the perspective view which looked at the display part with which the piezoelectric receiver was affixed from the back side. A piezoelectric receiver is shown, (a) is a front view, (b) is a plan view, and (c) is a rear view. It is FIG. 1 equivalent view which shows a comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  2 is a perspective view showing the mobile phone 1 according to the embodiment of the present invention, FIG. 3 is an exploded perspective view of the mobile phone 1 seen from the back side, and FIG. 4 is a view when the cover panel is removed. It is a front view showing a mobile phone. The mobile phone 1 is, for example, a so-called smartphone, and includes a display unit 2, a front-side cabinet 3 that houses the display unit 2 on the front side, and a back surface that covers the front-side cabinet 3 from the back side. A side cabinet 4 and a rear cover 5 covering the back side of the back side cabinet 4 are provided. A main board 6 is accommodated on the back of the front cabinet 3, and a battery 7 is accommodated on the back of the main board 6.

  FIG. 5 is a side sectional view showing the mobile phone 1, and FIG. 6 is a perspective view of the display unit 2 to which the piezoelectric receiver is attached as seen from the back side. The display unit 2 includes a transparent rectangular plate-like cover panel 2a made of glass, an acrylic plate, or the like. A sheet-like touch panel (not shown) and a rectangular plate-like liquid crystal display 2b are attached to the center of the back surface of the cover panel 2a. A flexible substrate 2c for connecting the liquid crystal display 2b and the touch panel to the main substrate 6 extends from the lower end of the liquid crystal display 2b. Then, on the back surface of the cover panel 2a above the liquid crystal display 2b, a rectangular plate-shaped piezoelectric receiver 10 that is long on the left and right for calling is attached.

  Specifically, the front side cabinet 3 is insert-molded with a reinforcing frame 3a made of a stainless steel plate or the like at the center, and a frame-like panel pasting portion 3b is provided at the peripheral edge. The upper panel pasting portion 3b is wider than the left and right panel pasting portions 3b, and a rectangular receiver accommodating portion 3c is recessed in front view. The piezoelectric receiver 10 is attached to the cover panel 2a with a pair of double-sided tapes 11 so as to correspond to the receiver accommodating portion 3c.

  FIG. 7 shows the piezoelectric receiver 10, where (a) is a front view, (b) is a plan view, and (c) is a rear view. The left and right length L1 of the pair of double-sided tapes 11 is substantially equal to the distance L2 between the pair of double-sided tapes 11 (L1 = L2). Note that “substantially equal” does not mean that they are completely equal, but allows some errors. The margins L3 and L4 at the periphery of the pair of double-sided tapes 11 may be small gaps that do not allow the double-sided tape 11 to protrude. For this reason, if the total length of the piezoelectric receiver 10 is L, L2 is substantially equal to L / 3. The piezoelectric receiver 10 incorporates a rectangular plate-like piezoelectric element 12 extending in the left-right direction, and a harness 13 extending from the piezoelectric element 12 is connected to the main board 6. The piezoelectric element 12 has a laminated structure, for example, and has a thickness of about 1 mm. Specifically, the harness 13 is composed of a flexible substrate. The dimensional relationship between L1, L2, L3, and L4 is not limited to this, and the vibration of the piezoelectric element 12 can be appropriately transmitted to the cover panel 2a and set so as not to be broken by a predetermined bending load of the cover panel 2a. do it.

  And the cushion member 15 is adhere | attached between the opposite side (back side of the center of right and left) between a pair of double-sided tapes 11 in the piezoelectric receiver 10, and the receiver accommodating part 3c front. Specifically, the cushion member 15 and the piezoelectric receiver 10 are pasted together with the silicon double-sided tape 16 in accordance with the silicon-based mold of the piezoelectric receiver 10, and the space between the receiver housing 3 c and the cushion member 15 is acrylic. It is affixed with a system double-sided tape 17. The bonding method of the cushion member 15 is not limited to this, and an adhesive or the like may be used.

  Thus, after the piezoelectric receiver 10 is attached to the cover panel 2a with a pair of double-sided tapes 11, the cover panel 2a is attached to the panel attaching part 3b with a frame-like double-sided tape (not shown), and the piezoelectric receiver 10 is received in the receiver. The harness 13 is accommodated in the portion 3c, and the harness 13 is connected to the main board 6 and the flexible board 2c is connected to the main board 6.

  1A and 1B are cross-sectional views schematically showing a piezoelectric receiver attached to a cover panel, where FIG. 1A shows the time of application and FIG. 1B shows the time when a bending stress is applied. FIG. 8 is a diagram corresponding to FIG. The cellular phone 1 assembled as described above is compared with a comparative example in which the double-sided tape 111 is attached to almost the entire front surface of the piezoelectric receiver 10.

  In terms of transmitting vibrations of the piezoelectric element 12, the comparative example shown in FIG. 8 is more efficient because the double-sided tape 11 has a larger ground contact area, but the piezoelectric receiver 10 of the present embodiment has no problem in making a call. It was.

  On the other hand, considering the case where the cover panel 2a is bent at an angle of 120 ° around the center of the left and right sides of the piezoelectric receiver 10, in the comparative example, as shown in FIG. Since the tape 111 is attached to the back surface of the cover panel 2a, the piezoelectric element 12 is also bent by 120 °. For this reason, there is a high possibility that the piezoelectric element 12 will break.

  However, in the present embodiment, as shown in FIG. 1, since the portion of the interval L2 corresponding to the left and right center of the piezoelectric element 12 is not bonded to the cover panel 2a, the left and right center of the piezoelectric element 12 is not bent. Then, the piezoelectric element 12 is bent at the left and right inner ends of each double-sided tape 11, but the angle is relaxed to about 150 °, and the probability that the piezoelectric element 12 is broken is greatly reduced. However, it has been found that if the ratio of L2 is made too small, the angle becomes small and the crack prevention effect decreases.

  Thus, in this embodiment, since the piezoelectric receiver 10 is affixed to the cover panel 2a by the pair of double-sided tapes 11 with a space in the center between the left and right sides of the piezoelectric receiver 10, an attempt is made to bend the cover panel 2a left and right. When a force is applied, the portion of the interval L2 does not bend following the cover panel 2a that is bent. For this reason, the piezoelectric element 12 is hard to break.

  Further, since the left and right central portions on the opposite side to the cover panel 2a are attached to the receiver housing portion 3c via the cushion member 15, the piezoelectric element 12 is pulled in the strain direction even when the cover panel 2a is distorted. Is effectively prevented.

  Therefore, according to the mobile phone 1 according to the present embodiment, the piezoelectric element 12 can be prevented from cracking while reliably transmitting the vibration of the piezoelectric element 12 to the cover panel 2a.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above embodiment, the straight-type mobile phone 1 is used, but a foldable or slide-type mobile phone may be used. In that case, a piezoelectric receiver may be provided on the upper side of the housing in which the display unit is accommodated. .

  In the above embodiment, the display unit 2 has a touch panel. However, the display unit 2 may have no touch panel, and the liquid crystal display 2b may be an organic EL display.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use. The technical features described in each embodiment can be combined with each other, and a new technical feature can be formed by combining them.

  As described above, the present invention is useful for a mobile phone having a piezoelectric receiver above a display unit.

1 Mobile phone
2 display section
2a Cover panel
2b liquid crystal display
2c Flexible substrate
3 Front cabinet (housing)
3a Reinforcement frame
3b Panel sticking part
3c Receiver housing
4 Rear cabinet
5 Rear cover
6 Main board
7 battery
10 Piezoelectric receiver
11 Double-sided tape
12 Piezoelectric elements
13 Harness
15 Cushion member
16 Silicone double-sided tape
17 Acrylic double-sided tape 111 Double-sided tape (comparative example)

Claims (3)

A mobile phone having a piezoelectric receiver for calling above the display unit,
A plate-like cover panel covering the surface of the display unit;
A housing to which the cover panel is attached;
A piezoelectric receiver having a piezoelectric element bonded to the back surface of the cover panel;
The piezoelectric receiver includes a rectangular piezoelectric element extending to the left and right,
The mobile phone according to claim 1, wherein the piezoelectric receiver is attached to the back surface of the cover panel by a pair of double-sided tapes spaced apart from each other on the left and right. The mobile phone according to claim 1,
The mobile phone according to claim 1, wherein the left and right lengths of the pair of double-sided tapes are substantially equal to an interval between the pair of double-sided tapes. The mobile phone according to claim 1 or 2,
A cellular phone, wherein a cushion member is bonded between the opposite side of the pair of double-sided tapes in the piezoelectric receiver and the housing.

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