JP4173396B2 - Portable electronic devices - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to PDC (Personal Digital Cellular: Mobile Phone), PHS (Personal Handy-Phon System), CDMA (Code Division Multiple Access), GSM (Global System for Mobile Personal Mobile Phone). In particular, the present invention relates to a portable electronic device that is lightweight and can be thinned.
[0002]
[Prior art]
Currently, portable electronic devices include PDC (Personal Digital Cellular), PHS (Personal Handy-Phone System), CDMA (Code Division Multiple Access), GSM (Global System for the large size book). Various types of personal digital assistants (PDA) (personal digital assistants) and portable personal computers have been made. These portable electronic devices are desired to be lightweight, thin, rich in rigidity, and small.
[0003]
Japanese Patent Application Laid-Open No. 2004-151688 discloses a portable terminal device in which a display unit housing having a display unit and an operation unit housing having an operation unit are folded, and front cases respectively constituting the display unit housing and the operation unit housing. And rear cases made of magnesium have been proposed.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-189786
[Problems to be solved by the invention]
However, since magnesium is an expensive material, there is a disadvantage in that if the entire casing constituting the portable wireless terminal is made of magnesium, it becomes very expensive. In addition, since magnesium is a relatively soft material, there is a risk of deformation of the housing.
[0006]
Furthermore, if the case including the antenna is made of metal, the antenna characteristics such as radio waves are affected, and there is a possibility that good reception cannot be performed.
[0007]
Therefore, it is an object of the present invention to provide an inexpensive portable electronic device that is lightweight, thin, and has mechanical rigidity and strength, and that also considers antenna characteristics and the like.
[0008]
[Means for Solving the Problems]
In the present invention therefore, a portable electronic which possess the other housing arranged an operation unit as one of the housing arranged a display unit, configured to be foldable and said one casing and another casing Equipment,
The front case on the display unit side that constitutes the one casing and the front case on the operation unit side of the other casing that faces the front case on the display unit side when the casings are folded together. Formed by alloy,
The rear case opposite to the display part constituting the one housing is formed of an aluminum alloy,
A contact portion between the aluminum alloy and the magnesium alloy is subjected to rust prevention treatment.
[0009]
As described above, the front case on the display unit side that constitutes one casing in the casing of the portable electronic device and the other casing that faces the front case on the display unit side when the casings are folded. The body is made of magnesium alloy on the front case side, and the rear case side opposite to the display part constituting the one housing is made of aluminum alloy, so that the body can be made thin and lightweight while maintaining strength. Even if it is made thin like this, it is strong against bending, and even if the internal display device is composed of a liquid crystal display device, even if it is dropped or pressed from the back of one housing, it will crack, chipping of chip parts, etc. It is possible to provide a housing that does not have a fear of occurrence of the problem. In addition, when different metals such as aluminum alloy and magnesium alloy are used in this way, electrolytic corrosion occurs due to the potential difference at the contact part, but this is also prevented by applying a rust prevention treatment to the contact part. In addition, a portable electronic device that is small, lightweight, thin, and has mechanical rigidity can be provided.
[0010]
The portable electronic device is configured to be foldable with the one housing and the other housing, so that the portable electronic device can be miniaturized when folded and provide a portable electronic device that is convenient to carry. it can.
[0011]
Furthermore, a radio circuit and an antenna are arranged in the other casing, and the rear case opposite to the operation unit is formed of a resin, so that good reception can be performed without affecting the antenna characteristics such as radio waves. The housing can be configured to be small, light and thin, and to obtain mechanical rigidity.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. This is just an example.
[0013]
1 is an exploded perspective view showing an embodiment in which the portable electronic device of the present invention is applied to a mobile phone, FIG. 2 is a perspective view of the mobile phone shown in FIG. 1 viewed from the back side, and FIG. 3 is shown in FIG. It is the perspective view which looked at the mobile telephone from the front side.
[0014]
The mobile phone shown in FIGS. 1 to 3 is of a foldable type, 1 is a display unit housing provided with a display device 15 made of liquid crystal or the like, and 2 is an operation unit housing provided with operation keys 18 for input. Body, 12 is an inner frame made of resin, 13 is a front case made of magnesium alloy that covers the periphery of the display unit 15, 14 is a hinge connecting part, 16 is a speaker, and 21 is an operation made of resin. The battery lid of the part housing 2 that accommodates the battery 25, 22 the rear case of the operation unit housing 2 formed of resin, 23 the front case formed of magnesium alloy of the operation unit housing 2, and 24 the antenna , 25 is a battery, and 26 is a circuit board.
[0015]
In the present invention, the front case 13 that covers the periphery of the display device 15 made of liquid crystal or the like in the display unit housing 1 is formed of magnesium alloy, and the rear case 11 of the display unit housing 1 is also formed of aluminum alloy. is there. In addition, when different metals such as aluminum alloy and magnesium alloy are used, electrolytic corrosion occurs due to the potential difference at the contact part, but in order to prevent this, the magnesium alloy side is subjected to chemical conversion treatment and coating treatment. Corresponding to rust prevention by fitting a mold formed by adhesion with aluminum alloy for fitting between rear case 11 made of aluminum alloy and front case 13 made of magnesium alloy. Yes. The chemical conversion treatment includes chromate treatment or non-chromate treatment. When non-chromate treatment is performed, a Zr-based, Ti-based, Mo-based, Mn-based, or Ce-based film may be used.
[0016]
Further, in the operation unit housing 2 having the circuit board 26 inside, the front case 23 including the periphery of the operation unit 18 is formed of magnesium alloy, but the rear case 22 and the battery lid 21 are formed of resin, An antenna 24 is provided on the operation unit casing 2 side.
[0017]
As described above, the front case 13 covering the periphery of the display unit 15 of the display unit housing 1 is made of magnesium alloy and the rear case 11 is made of aluminum alloy, so that the strength of the housing is greatly improved. The thickness of the entire set can be reduced because the thickness can be made thinner than when 11 and 13 are made of resin. In addition, as shown in FIG. 4, when the case 13 is formed by using resin for the case 13, the cases 11 and 13 may be cracked or damaged. Since aluminum alloy and magnesium alloy are used, bending can be minimized, and cracking and breakage of the internal liquid crystal display device, internal substrate, and exterior can be prevented.
[0018]
Further, even if static pressure is applied from the back as shown in FIG. 5, the rear case 11 is formed of an aluminum alloy, so that bending does not occur without adding ribs or increasing the thickness of the case 11, Even if the display unit 15 is composed of a liquid crystal display device or the like, there is no risk of cracking or chipping of chip parts. In addition, since the aluminum alloy has a high thermal conductivity, it is possible to thermocompress another part such as a resin so as to have a screwing function, a fitting function, or the like. Furthermore, as described above, in the combination of different metals, electrolytic corrosion (galvanic corrosion) occurs due to the potential difference, but the aluminum alloy has a small potential difference with the magnesium alloy, and as described above, the aluminum alloy side is subjected to the alumite treatment. In addition, the magnesium alloy side is subjected to a chemical conversion treatment and a coating treatment to be rust-proofed, and is further configured by bonding an aluminum alloy for fitting a rear case 11 formed of an aluminum alloy and a front case 13 formed of a magnesium alloy. By sandwiching the molded mold in between, it becomes possible to commercialize the product without quality problems.
[0019]
On the side of the operation unit housing 2 that houses the electronic circuit and the antenna 24, the front case 23 including the periphery of the operation unit is formed of magnesium alloy, but the rear case 22 and the battery lid 21 are formed of resin. Influencing antenna characteristics such as radio waves is avoided. Compared to the case where the housing is made of resin, the use of magnesium alloy and aluminum alloy can improve the metal feeling, appearance, and feel, and the appearance of the aluminum alloy surface can be improved by anodizing. Differentiation is possible.
[0020]
Further, since the expensive magnesium alloy is used only for the front case 13 of the display unit housing 1 and the front case 23 of the operation unit housing 2, the mobile phone can be manufactured at low cost, and the front cases 13, 23 are used. Since the same material is formed on the side, it is possible to unify the color and texture when both housings 1 and 2 are opened.
[0021]
In the above description, the case of a mobile phone as an example of a portable electronic device has been described. However, the present invention is a PDA (Personal Digital Assistant) having a size similar to a notebook, a portable personal computer, etc. Obviously, it can be applied to various portable electronic devices.
[0022]
【The invention's effect】
As described above, according to the present invention, the front case on the display unit side that constitutes one casing in the casing of the portable electronic device and the front case on the display unit side when the casings are folded together. The other housings facing each other are made of magnesium alloy on the front case side, and the rear case side opposite to the display portion constituting the one housing is made of aluminum alloy , so that ribs are added to the housing. It can be made small, thin, and lightweight without being damaged, and even if it is thin, it is strong against bending, and even if the display unit is composed of a liquid crystal display device, for example, it can be dropped or pressed from the back of the display unit housing Even if there is, there is no fear of cracking or chipping of chip parts. Further, when the aluminum alloy and the magnesium alloy are brought into contact with each other, electrolytic corrosion due to a potential difference occurs at the contact portion. However, since the contact portion of the aluminum alloy is subjected to rust prevention treatment, the electrolytic corrosion can be prevented.
[0023]
Further, since the expensive magnesium alloy is used only for the front case, the mobile phone can be manufactured at a low cost, and the two cases are formed of the same material on the front case side. It is possible to unify the colors when the housing is opened.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment in which a portable electronic device of the present invention is applied to a mobile phone.
FIG. 2 is a perspective view of the mobile phone shown in FIG. 1 as viewed from the back side.
3 is a perspective view of the mobile phone shown in FIG. 1 as viewed from the front side.
4 is a side view showing a state where the mobile phone shown in FIG. 1 is dropped from the display unit housing side. FIG.
FIG. 5 is a side view for explaining a case where a back surface static pressure is applied to the display unit housing of the mobile phone shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Display part housing | casing 2 Operation part housing | casing 11 Rear case 12 Internal frame 13 Front case 14 Hinge part 15 Display part 16 Speaker 21 Battery lid 22 Rear case 23 Front case 24 Antenna 25 Battery 26 Circuit board

Claims (2)

A portable electronic device in which one of the housing arranged a display unit and an operation unit possess the other with a housing arranged, configured to be foldable and said one casing and another casing,
The front case on the display unit side that constitutes the one casing and the front case on the operation unit side of the other casing that faces the front case on the display unit side when the casings are folded together. Formed by alloy,
The rear case opposite to the display part constituting the one housing is formed of an aluminum alloy,
A portable electronic device, wherein a contact portion between the aluminum alloy and the magnesium alloy is subjected to rust prevention treatment. 2. The portable electronic device according to claim 1, wherein a radio circuit and an antenna are arranged in the other casing, and a rear case opposite to the operation unit is formed of resin.

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