JP2013146015A - Electronic apparatus - Google Patents

Abstract

An electronic apparatus having a piezoelectric element is miniaturized.
An electronic apparatus includes a housing and a piezoelectric element. The housing 100 includes a first housing 110 and a second housing 120. The first housing 110 constitutes the first surface of the electronic device 10. The second housing 120 constitutes the second surface of the electronic device 10. The second surface is a surface opposite to the first surface. The housing 100 has a side surface 102. The piezoelectric element 310 is located on the side surface 102. The piezoelectric element 310 constitutes a part of the oscillation device 300.
[Selection] Figure 1

Description

  The present invention relates to an electronic device having a piezoelectric element as a vibration source.

  Electronic devices often have a transmission source such as a speaker. One of the speakers uses a piezoelectric element as a transmission source (for example, Patent Documents 1 to 3). Among these, the technique described in Patent Document 1 uses a transparent piezoelectric film as the piezoelectric element in order to provide the piezoelectric element on the LCD. Patent Document 2 describes that a piezoelectric element is formed of a piezoelectric film, and the piezoelectric film is provided along a curved surface.

JP 2000-152385 A Japanese Patent Laid-Open No. 2003-40041 JP 2011-97181 A

  Generally, electronic devices are required to be downsized. The present inventor considered that electronic devices can be reduced in size by devising a method for mounting piezoelectric elements. That is, an object of the present invention is to reduce the size of an electronic device having a piezoelectric element.

According to the present invention, a housing having a first surface, a second surface that is a surface opposite to the first surface, and a side surface that connects an end of the first surface and an end of the second surface;
A piezoelectric element provided in the housing and serving as a vibration source;
With
The housing is
A first housing having the first surface;
A second housing having the second surface;
Have
The piezoelectric element is provided with an electronic device located on the side surface.

  According to the present invention, an electronic device having a piezoelectric element can be reduced in size.

It is a top view of the electronic device which concerns on 1st Embodiment. It is the side view which looked at the electronic device from the B direction of FIG. It is AA 'sectional drawing of FIG. It is a figure which shows the structure of an oscillation apparatus. It is sectional drawing which shows the structure of the electronic device which concerns on 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate.

(First embodiment)
FIG. 1 is a plan view of an electronic device 10 according to the first embodiment. FIG. 2 is a side view of the electronic device 10 as viewed from the direction B of FIG. The electronic device 10 includes a housing 100 and a piezoelectric element 310. The housing 100 includes a first housing 110 and a second housing 120. The first housing 110 constitutes the first surface of the electronic device 10. The second housing 120 constitutes the second surface of the electronic device 10. The second surface is a surface opposite to the first surface. The housing 100 has a side surface 102. The piezoelectric element 310 is located on the side surface 102. The piezoelectric element 310 constitutes a part of the oscillation device 300.

  A plurality of electronic components are provided inside the electronic device 10. For this reason, a space for disposing the piezoelectric element 310 is unlikely to exist inside the electronic device 10. However, electronic components are rarely provided in the vicinity of the side surface 102 within the electronic device 10. Therefore, when the piezoelectric element 310 is provided on the side surface 102, it is possible to suppress an increase in the volume inside the housing 100 due to the piezoelectric element 310. Details will be described below.

  The electronic device 10 is a portable electronic device such as a portable communication terminal, a portable personal computer, a portable game device, a portable audio reproducing device, or a portable video reproducing device. However, the electronic device 10 may be other devices.

  The electronic device 10 has a display 200. The display 200 is provided on the first surface 104 of the housing 100. Since the first surface 104 and the second surface 106 are larger than the side surface 102, the display 200 can be enlarged by providing the display 200 on the first surface 104. In the example shown in the figure, only the display 200 is provided on the first surface 104 of the electronic device 10. The display 200 is a touch panel display, and input to the electronic device 10 is performed via the display 200. Note that an input unit such as a keyboard may be provided on the first surface 104 of the electronic device 10.

  As shown in FIG. 2, the first housing 110 has a first side surface 112, and the second housing 120 has a second side surface 122. The first side surface 112 is connected to the first surface 104, and the second side surface 122 is connected to the second surface 106. The first side surface 112 constitutes a part of the side surface 102, and the second side surface 122 constitutes the remaining part of the side surface 102. The piezoelectric element 310 is sandwiched between the first side surface 112 and the second side surface 122. Specifically, a concave portion is provided in each of the first side surface 112 where the piezoelectric element 310 is provided and in the second side surface 122 where the piezoelectric element 310 is provided. The piezoelectric element 310 is provided so as to fill these recesses.

  3 is a cross-sectional view taken along the line AA ′ of FIG. As shown in the figure, a circuit board 130 and a battery 140 are provided inside the housing 100. The battery 140 is located closer to the second surface 106 than the circuit board 130. A plurality of circuit components 131 are provided on the circuit board 130. The circuit component 131 is, for example, a display control unit for controlling the display 200 and an oscillation control unit 132 (see FIG. 4) for controlling the oscillation device 300. Since the electronic device 10 is required to be downsized, the inside of the housing 100 has almost no space for providing the piezoelectric element 310. However, in this embodiment, the piezoelectric element 310 is provided on the side surface 102 of the housing 100. That is, the piezoelectric element 310 is a part of the housing 100. For this reason, it is not necessary to enlarge the housing 100 in order to provide the piezoelectric element 310.

  FIG. 4 is a diagram illustrating a configuration of the oscillation device 300. As described above, the oscillation device 300 includes the piezoelectric element 310. In order for the piezoelectric element 310 to function as a transmission source, it is necessary to provide a holding unit 320 that fixes the edge of the piezoelectric element 310. The holding unit 320 may serve as the first housing 110 and the second housing 120, or may be configured as a separate member from the first housing 110 and the second housing 120.

  The piezoelectric element 310 is made of a polymer material exhibiting piezoelectric characteristics, such as polyvinylidene fluoride. However, the piezoelectric element 310 may be made of ceramics exhibiting piezoelectric characteristics, such as PZT. In this case, the piezoelectric element 310 is fixed to a diaphragm made of phosphor bronze or stainless steel, and the edge of the diaphragm is fixed to the holding unit 320. The piezoelectric element 310 has a thickness of 1 mm or less.

  Electrodes are provided on both surfaces of the piezoelectric element 310. A drive signal from the oscillation control unit 132 is input to these electrodes. The oscillation control unit 132 generates a modulation signal for a parametric speaker as the drive signal described above, for example, by modulating an input audio signal of an audible sound. This modulation signal is generated, for example, by AM (Amplitude Modulation) modulation, DSB (Double Side Band) modulation, SSB (Single Side Band) modulation, or FM (Frequency Modulation) modulation.

  Since the piezoelectric element 310 is exposed from the housing 100, it can be used as a tactile interface. In this case, the oscillation control unit 132 causes the piezoelectric element 310 to generate vibration when information to be notified to the user of the electronic device 10 is generated.

  The piezoelectric element 310 can also be used as an input unit. In this case, the piezoelectric element 310 generates electric power when pressed. This power is recognized as an input by the user.

  As described above, according to the present embodiment, since the piezoelectric element 310 is provided on the side surface 102 of the casing 100, it is not necessary to enlarge the casing 100 in order to provide the piezoelectric element 310. Therefore, the electronic device 10 can be reduced in size.

(Second Embodiment)
FIG. 5 is a cross-sectional view showing the configuration of the electronic device 10 according to the second embodiment, and corresponds to FIG. 3 in the first embodiment. The electronic device 10 according to the present embodiment has the same configuration as the electronic device 10 according to the first embodiment except for the following points.

  First, the piezoelectric element 310 is not provided between the first housing 110 and the second housing 120. For this reason, neither the first side surface 112 of the first housing 110 nor the second side surface 122 of the second housing 120 has a recess for fitting the piezoelectric element 310 therein.

  Further, the side surface 102 of the housing 100 is curved at the boundary with the first surface 104. The piezoelectric element 310 is provided in this curved portion.

  Also according to this embodiment, the same effect as that of the first embodiment can be obtained. In addition, the piezoelectric element 310 can be provided at a boundary portion between the side surface 102 and the first surface 104. A display 200 is provided on the first surface 104. For this reason, when using the piezoelectric element 310 as a transmission source of a speaker, it becomes easy to deliver a sound to the user who is watching the display 200.

  As mentioned above, although embodiment of this invention was described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.

DESCRIPTION OF SYMBOLS 10 Electronic device 100 Case 102 Side surface 104 First surface 106 Second surface 110 First housing 112 First side surface 120 Second housing 122 Second side surface 130 Circuit board 131 Circuit component 132 Oscillation control unit 140 Battery 200 Display 300 Oscillation Device 310 Piezoelectric Element 320 Holding Unit

Claims (4)

A housing having a first surface, a second surface that is a surface opposite to the first surface, and a side surface that connects an end of the first surface and an end of the second surface;
A piezoelectric element provided in the housing and serving as a vibration source;
With
The housing is
A first housing having the first surface;
A second housing having the second surface;
Have
The piezoelectric element is an electronic device located on the side surface. The electronic device according to claim 1,
The first housing has a first side part that is a part of the side surface and is connected to the first surface;
The second housing has a second side portion that is a part of the side surface and is connected to the second surface;
The piezoelectric device is an electronic device sandwiched between the first side portion and the second side portion. The electronic device according to claim 1,
The side surface has a curved surface at a connection portion with the first surface,
The piezoelectric device has a piezoelectric film and is provided on the curved surface. The electronic device according to claim 3,
An electronic device having a display provided on the first surface.

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