JP2001185865A - Case for portable communication terminals - Google Patents
Case for portable communication terminalsInfo
- Publication number
- JP2001185865A JP2001185865A JP36799699A JP36799699A JP2001185865A JP 2001185865 A JP2001185865 A JP 2001185865A JP 36799699 A JP36799699 A JP 36799699A JP 36799699 A JP36799699 A JP 36799699A JP 2001185865 A JP2001185865 A JP 2001185865A
- Authority
- JP
- Japan
- Prior art keywords
- housing
- magnesium alloy
- forging
- portable communication
- case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004891 communication Methods 0.000 title claims abstract description 11
- 229910000861 Mg alloy Inorganic materials 0.000 claims abstract description 33
- 238000005242 forging Methods 0.000 claims description 39
- 239000000463 material Substances 0.000 claims description 31
- 239000004033 plastic Substances 0.000 claims description 9
- 238000010295 mobile communication Methods 0.000 claims description 5
- 230000007257 malfunction Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 14
- 229910045601 alloy Inorganic materials 0.000 description 11
- 230000000694 effects Effects 0.000 description 9
- 238000005266 casting Methods 0.000 description 8
- 230000001976 improved effect Effects 0.000 description 7
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 230000009467 reduction Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000004512 die casting Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 4
- 238000005260 corrosion Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 230000002238 attenuated effect Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 239000011573 trace mineral Substances 0.000 description 3
- 235000013619 trace mineral Nutrition 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 102220253765 rs141230910 Human genes 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Forging (AREA)
- Casings For Electric Apparatus (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、マグネシウム合金
からなる素材を鍛造などの塑性加工により成形した携帯
電話用筐体などの有線又は無線による通信に用いられる
携帯通信端末用筐体に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a casing for a portable communication terminal used for wired or wireless communication, such as a casing for a portable telephone formed by molding a material made of a magnesium alloy by plastic working such as forging. .
【０００２】[0002]
【従来の技術】携帯電話等の電子機器からは電磁波が外
部に洩れ、この電磁波が他の電子機器の誤動作を引き起
こしたり、人体に悪影響をおよぼすことが指摘されてい
る。このため、電子機器から漏洩する電磁波を遮蔽・吸
収するための対策が種々提案されている。例えば、熱可
塑性樹脂製の筐体から構成される電子機器では、筐体の
内側部に電磁波を遮蔽・吸収するシール部を設けること
が行われている。また、導電性があり、かつ比重が小さ
い金属であるアルミニウム合金やマグネシウム合金等を
ダイカスト鋳造法あるいは半溶融成形加工法により筐体
を成形し、電子回路から漏洩した電磁波をこの導電性の
筐体により遮蔽・吸収する方法も提案されている。さら
に、熱可塑性樹脂と導電性金属からなる複合筐体により
電磁波を遮蔽・吸収する方法も提案されている。2. Description of the Related Art It has been pointed out that an electromagnetic wave leaks from an electronic device such as a portable telephone to the outside, and this electromagnetic wave causes a malfunction of another electronic device or adversely affects a human body. For this reason, various measures have been proposed for shielding and absorbing electromagnetic waves leaking from electronic devices. For example, in an electronic device including a casing made of a thermoplastic resin, a seal portion that shields and absorbs electromagnetic waves is provided inside the casing. In addition, aluminum alloys and magnesium alloys, which are conductive and have low specific gravity, are molded into a housing by die casting or semi-molten molding, and electromagnetic waves leaked from electronic circuits are transferred to this conductive housing. There is also proposed a method of shielding / absorbing by using. Further, a method has been proposed in which electromagnetic waves are shielded and absorbed by a composite housing made of a thermoplastic resin and a conductive metal.
【０００３】[0003]
【発明が解決しようとする課題】近年、急激に普及して
いる携帯電話等の携帯通信端末用の筐体に要求される機
能としては、上記電磁波の遮蔽・吸収の他に、意匠性、
小型軽量化、耐衝撃性（剛性）、製造時の生産性があ
る。今後、特に携帯電話の高機能化にともなう液晶表示
装置の大型化等により筐体の開口率（筐体の全表面積に
対する開口部の比率）は一層大きくなり、前記電磁波の
漏洩対策と筐体の剛性向上が強く要求されてくる。The functions required of a housing for a portable communication terminal such as a mobile phone, which have been rapidly spreading in recent years, include not only the shielding and absorption of the electromagnetic waves, but also the design,
Small size, light weight, impact resistance (rigidity), and productivity during manufacturing. In the future, the opening ratio of the housing (the ratio of the opening to the total surface area of the housing) will be further increased due to the increase in the size of the liquid crystal display device, particularly with the enhancement of the functions of mobile phones. There is a strong demand for improved rigidity.
【０００４】さらに、携帯電話機の高機能化に伴い、内
装される電子回路から漏洩する電磁波の強度はますます
強いものとなり、筐体に対する電磁波シールド性のさら
なる向上も求められている。さらには、他の電子機器か
ら発生する電磁波により、誤動作を起こすことも考えら
れ、筐体に対する電磁波シールド性の向上が求められて
いた。[0004] Further, with the advancement of functions of mobile phones, the intensity of electromagnetic waves leaking from electronic circuits installed therein has become increasingly stronger, and there is a demand for further improvement of electromagnetic wave shielding properties for a housing. Furthermore, malfunctions may occur due to electromagnetic waves generated from other electronic devices, and there has been a demand for improved electromagnetic wave shielding properties for the housing.
【０００５】携帯電話から漏洩する電磁波を遮蔽・吸収
し、さらに筐体を軽量化しかつ剛性を高くする方法とし
て、前記の通りマグネシウム合金をダイカストあるいは
半溶融加工法などの鋳造法により成形した筐体が提案さ
れている。しかし、マグネシウム合金の溶湯を鋳造して
得られる成形体は、その製法上の制約から、比較的厚肉
のものに限定され、鋳造法で成形した場合は、その肉厚
の最小値は０．８ｍｍ程度が限界である。また、その製
造過程中において、鋳造欠陥や酸化物を内部および表面
に介在させてしまう恐れが大きい。もしも、これら欠陥
が介在していると、機械的強度および耐食性について問
題が発生する。As a method of shielding and absorbing electromagnetic waves leaking from a mobile phone, and further reducing the weight and increasing the rigidity of the casing, as described above, a casing formed by casting a magnesium alloy by die casting or semi-solid processing. Has been proposed. However, the compact obtained by casting a molten magnesium alloy is limited to a relatively thick one due to restrictions on the production method. When molded by the casting method, the minimum value of the wall thickness is 0.1 mm. The limit is about 8 mm. Further, during the manufacturing process, there is a great possibility that casting defects and oxides are interposed inside and on the surface. If these defects are present, problems occur in mechanical strength and corrosion resistance.
【０００６】ダイカスト鋳造法によりマグネシウム合金
製の筐体を成形する場合には、マグネシウム合金はＡＳ
ＴＭ規格のＡＺ９１材が一般に使用されている。そして
成形した筐体には、操作ボタンや液晶表示装置用の開口
部を設けるためにプレス打ち抜き加工を行う必要があ
る。しかし、 ＡＺ９１材を使用した場合には、このプ
レス打ち抜き面にバリが発生しやすく、このバリの除去
工程を設ける必要が生じ生産性低下の要因になってい
る。本発明の目的は、上記従来技術の欠点を改善し、電
磁波の遮蔽・吸収機能を向上させるとともに電磁波によ
る電子回路の誤動作も防止し、さらに薄型にしても剛性
が向上し、かつ製造時の生産性も向上する携帯電話用筐
体を提供することにある。When a magnesium alloy casing is formed by die casting, the magnesium alloy is made of AS.
TM standard AZ91 material is generally used. Then, it is necessary to perform press punching on the molded housing in order to provide an operation button and an opening for a liquid crystal display device. However, when the AZ91 material is used, burrs are easily generated on the press-punched surface, and it is necessary to provide a step of removing the burrs, which is a factor of reducing productivity. SUMMARY OF THE INVENTION It is an object of the present invention to improve the drawbacks of the above-described conventional technology, to improve the function of shielding and absorbing electromagnetic waves, to prevent malfunction of electronic circuits due to electromagnetic waves, to improve the rigidity even if the thickness is reduced, and to reduce the production It is another object of the present invention to provide a mobile phone housing that has improved performance.
【０００７】[0007]
【課題を解決するための手段】本発明は、マグネシウム
合金圧延板素材に塑性加工が施され、主要部の肉厚が
０．２〜１．０ｍｍであり、電気抵抗率が４．３〜４．
８０μΩ・ｃｍである電磁波シールド性に優れた携帯通
信端末用筐体である。また本発明に用いられる塑性加工
が熱間又は温間の鍛造加工であると良い。さらに、携帯
通信端末用筐体の内側部の表面に微細な凹凸部が形成さ
れており、特にその凹凸部の平均粗さＲａが０．０１〜
０．２ｍｍであると良い。According to the present invention, a magnesium alloy rolled sheet material is subjected to plastic working, the main part has a thickness of 0.2 to 1.0 mm, and an electric resistivity of 4.3 to 4 mm. .
It is a housing for a portable communication terminal having an excellent electromagnetic wave shielding property of 80 μΩ · cm. The plastic working used in the present invention is preferably hot or warm forging. Further, fine irregularities are formed on the surface of the inner part of the housing for the mobile communication terminal, and particularly, the average roughness Ra of the irregularities is 0.01 to
It is good to be 0.2 mm.
【０００８】本発明で用いられるマグネシウム合金素材
としては、塑性加工の素材として考えられる押出し材な
どの中から特に加工性、組織の均一性などを考慮して、
圧延板素材が最適である。As the magnesium alloy material used in the present invention, among extruded materials considered as materials for plastic working, in particular, considering workability, uniformity of structure, and the like,
Rolled sheet material is optimal.
【０００９】また、本発明の携帯通信端末電話用筐体
は、前記マグネシウム合金が、質量比で、Ａｌ：１〜６
％，Ｚｎ：２．５％以下、微量元素０．２％以下を含有
すると好ましい。マグネシウム合金を鍛造して、携帯電
話用筐体を製造するに際しては、鍛造性に優れたマグネ
シウム合金であることが望ましい。アルミニウム含有量
が少ないと鍛造性は良いが、剛性が悪くなるので、少な
くともアルミニウムは１％以上含有させる。一方、アル
ミニウム含有量が多くなると鍛造性、耐食性が低下す
る。このため、アルミニウム含有量を６％以下とする。
亜鉛もアルミニウムと同様な影響があり、鍛造性とメタ
ルフローの兼ね合いから２．５％以下含有させる。微量
元素としては、希土類元素，リチウム，ジルコニウム等
である。このような合金としては、例えば、ＡＳＴＭ規
格のＡＺ３１合金、ＡＺ２１合金、ＡＭ２０合金などか
らなる展伸材がある。Further, in the case for a portable communication terminal telephone according to the present invention, the magnesium alloy may have a mass ratio of Al: 1 to 6;
%, Zn: 2.5% or less, and trace element 0.2% or less. When forging a magnesium alloy to manufacture a housing for a mobile phone, it is desirable that the magnesium alloy be excellent in forgeability. If the aluminum content is small, the forgeability is good, but the rigidity deteriorates. Therefore, at least 1% or more of aluminum is contained. On the other hand, when the aluminum content increases, forgeability and corrosion resistance decrease. For this reason, the aluminum content is set to 6% or less.
Zinc has the same effect as aluminum, and is contained in an amount of 2.5% or less in consideration of the balance between forgeability and metal flow. Trace elements include rare earth elements, lithium, zirconium and the like. Such alloys include, for example, wrought materials made of ASTM standard AZ31 alloy, AZ21 alloy, AM20 alloy and the like.
【００１０】上記組成を有するマグネシウム合金であれ
ば、塑性加工、特に熱間鍛造で超薄肉かつ高剛性に、ま
た、液晶表示部係合孔、押釦嵌合孔などを容易に精度良
く打ち抜き成形できる。特に、マグネシウム合金圧延薄
板素材に熱間鍛造を施すことで、素材状態からの強度向
上が著しく、伸びは変わらないが、引張強さが約１．３
倍、耐力が約１．５倍程度と高剛性となる。携帯通信端
末用筐体としてより好ましくは、２７０ＭＰａ以上の引
張強度、１４０ＭＰａ以上の耐力を有し、さらに圧延薄
板素材を用いることにより、素材中の欠陥の発生がほと
んどないことから、成形された筐体の欠陥を起因とする
強度低下の問題の発生も少ない。主要部肉厚が０．２ｍ
ｍ未満では筐体の剛性が不足する。一方、主要部肉厚が
１．０ｍｍを超えると、外形寸法を規定した場合、筐体
内に実装する容積を確保できないことがある。主要部肉
厚は好ましくは０．３〜０．８ｍｍである。主要部と
は、肉厚変動のない部分を指し、突起部などがある部分
は含めないものとする。With a magnesium alloy having the above composition, plastic working, especially hot forging, is ultra-thin and has high rigidity, and the liquid crystal display section engaging hole, the push button fitting hole, etc. are easily and accurately stamped and formed. it can. In particular, by subjecting a magnesium alloy rolled sheet material to hot forging, the strength is remarkably improved from the material state and the elongation does not change, but the tensile strength is about 1.3.
And the proof strength is about 1.5 times, which is high rigidity. More preferably as a casing for a mobile communication terminal, it has a tensile strength of 270 MPa or more, a proof stress of 140 MPa or more, and furthermore, by using a rolled thin sheet material, there is almost no occurrence of defects in the material. There is less occurrence of a problem of strength reduction due to body defects. Main part thickness is 0.2m
If it is less than m, the rigidity of the housing is insufficient. On the other hand, if the thickness of the main part exceeds 1.0 mm, it may not be possible to secure a volume to be mounted in the housing when the external dimensions are specified. The thickness of the main part is preferably 0.3 to 0.8 mm. The main portion refers to a portion where there is no variation in wall thickness, and does not include a portion having a projection or the like.
【００１１】また、本発明においては、上記のマグネシ
ウム合金素材を鍛造などの塑性加工することにより、電
磁波シールド性の指標の一つである電気抵抗率を、ダイ
カスト法などの鋳造法により成形した筐体より高くする
ことができる。その値は、電気抵抗率が４．３〜４．８
０μΩ・ｃｍである。そして、電気抵抗率が高いほど、
電磁波を遮蔽・吸収する効果が高くすることができる。
本発明のようにマグネシウム合金からなる薄板素材を鍛
造により成形した筐体は、鋳造法により成形した筐体と
比較して電磁波を遮蔽・吸収する効果は向上することに
なる。好ましい電気抵抗率は４．５〜４．８０μΩ・ｃ
ｍである。Further, in the present invention, the magnesium alloy material is subjected to plastic working such as forging, so that the electrical resistivity, which is one of the indexes of electromagnetic wave shielding, is formed by a casting method such as a die casting method. Can be higher than body. The electrical resistivity is 4.3 to 4.8.
0 μΩ · cm. And the higher the electrical resistivity,
The effect of shielding and absorbing electromagnetic waves can be enhanced.
A casing formed by forging a thin sheet material made of a magnesium alloy as in the present invention has an improved effect of shielding and absorbing electromagnetic waves as compared with a casing formed by a casting method. The preferred electric resistivity is 4.5 to 4.80 μΩ · c.
m.
【００１２】また、本発明の携帯通信端末用筐体におい
ては、筐体の内側部の表面に微細な凹凸部を形成してい
る。携帯電話の筐体内の電子回路から発生した数ＧＨｚ
の電磁波は、この微細な凹凸部により筐体内への反射を
抑制することができる。すなわち、筐体の内側表面の微
細な凹凸部により電磁波は渦電流による損失作用が生じ
て減衰することになる。この作用により、本発明の携帯
電話用筐体は、電子回路から発生した電磁波の反射を防
止するために、電子回路の誤動作を防止する効果も生じ
ることになる。なお、筐体の内側部に形成する上記の微
細な凹凸部は、平坦な面を有する箇所の可能な限り広い
範囲に形成することが好ましい。また、上記微細な凹凸
部の平均粗さＲａは０．０１〜０．２ｍｍにすると電磁
波の反射を抑制し減衰効果を向上させることができる。
また微細な凹凸の形成方法は鍛造に用いる金型の表面に
形成して、筐体に転写しても良いし、鍛造後にショット
ブラストなどを行うことにより、形成しても良い。Further, in the case for a portable communication terminal of the present invention, fine irregularities are formed on the surface of the inside of the case. Several GHz generated from the electronic circuit in the housing of the mobile phone
The reflection of the electromagnetic wave into the housing can be suppressed by the fine irregularities. That is, the electromagnetic wave is attenuated due to the loss effect due to the eddy current due to the minute irregularities on the inner surface of the housing. By this effect, the mobile phone casing of the present invention also has an effect of preventing malfunction of the electronic circuit in order to prevent reflection of electromagnetic waves generated from the electronic circuit. In addition, it is preferable that the above-mentioned fine unevenness formed on the inner part of the housing is formed in a widest possible range of a portion having a flat surface. When the average roughness Ra of the fine unevenness is 0.01 to 0.2 mm, the reflection of electromagnetic waves can be suppressed and the attenuation effect can be improved.
Further, as a method for forming fine irregularities, the fine irregularities may be formed on the surface of a mold used for forging and transferred to a housing, or may be formed by performing shot blasting or the like after forging.
【００１３】[0013]
【発明の実施の形態】以下本発明の実施の形態を図面に
基づいて説明する。図１、図２は本発明の実施の形態を
示す展開組立図である。同図において、１は上側筐体
（フロントケース）、２は操作ボタン用開口部、３は液
晶表示装置用開口部、４はフリップ、５は下側筐体（リ
アケース）、６はアンテナ、７は下側筐体５に設けたア
ンテナ６を挿入する挿入口、８は回路基板、９はバッテ
リー、１０はバッテリーケース蓋である。上側筐体１、
下側筐体５および回路基板８にはネジ孔１１、１２、１
３等を設けてネジ（図示せず）により上側筐体１と下側
筐体５との間に回路基板８が固定される構造になってい
る。また、上側筐体１と下側筐体５との嵌合は、図示し
ていないが、合わせ面に嵌合用凹凸部を設けて気密な嵌
合ができる構造になっている。なお、図１、図２には示
していないが、上側筐体１の上方部にはスピーカ用開口
部、同下方部にはマイクロホン用の開口部が成形されて
いる。Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are exploded views showing an embodiment of the present invention. In the figure, 1 is an upper case (front case), 2 is an operation button opening, 3 is a liquid crystal display device opening, 4 is a flip, 5 is a lower case (rear case), 6 is an antenna, Reference numeral 7 denotes an insertion slot for inserting the antenna 6 provided in the lower housing 5, reference numeral 8 denotes a circuit board, reference numeral 9 denotes a battery, and reference numeral 10 denotes a battery case cover. Upper housing 1,
Screw holes 11, 12, 1 are provided in lower housing 5 and circuit board 8.
3 and the like, and the circuit board 8 is fixed between the upper housing 1 and the lower housing 5 by screws (not shown). The fitting of the upper housing 1 and the lower housing 5 is not shown, but has a structure in which a fitting concave-convex portion is provided on the mating surface so that airtight fitting is possible. Although not shown in FIGS. 1 and 2, an opening for a speaker is formed in an upper portion of the upper housing 1, and an opening for a microphone is formed in a lower portion of the upper housing 1.
【００１４】本発明は、上側筐体１、下側筐体５および
バッテリーケース蓋１０とをマグネシウム合金からなる
厚さ３ｍｍ以下の薄板素材（展伸材）を鍛造とプレス加
工との組合せにより成形したことに特徴がある。このマ
グネシウム合金は鍛造性がよい展伸材を用いることが好
ましい。本発明に用いるマグネシウム合金の組成は、前
記のように重量比でＡｌ：１〜６％、Ｍｎ：０．５％以
下、微量元素が０．２％以下、残部がＭｇおよび不可避
不純物からなる展伸材を用いるとよい。このような展伸
材としては、例えば、ＡＳＴＭ規格のＡＺ３１合金、Ａ
Ｍ２０合金が適している。また、厚さ３ｍｍ以下の薄板
素材を使用する理由は下記の通りである。厚さ３ｍｍを
超えるマグネシウム合金薄板素材を用いて、最も薄い箇
所で厚さ０．２〜１．０ｍｍの薄肉筐体を鍛造成形しよ
うとすると、鍛造加工の圧下率を大きくしなければなら
ず、鍛造時のマグネシウム合金のメタルフローが著しく
なり、再結晶した微粒子がメタルフローに沿って出現し
たり、偏析して存在したりする恐れがある。このため、
厚さ３ｍｍ以下のマグネシウム合金製の薄板素材を使用
することが好ましい。According to the present invention, the upper housing 1, the lower housing 5, and the battery case lid 10 are formed from a thin sheet material (extended material) having a thickness of 3 mm or less made of a magnesium alloy by a combination of forging and pressing. There is a feature in doing. For this magnesium alloy, it is preferable to use a wrought material having good forgeability. As described above, the composition of the magnesium alloy used in the present invention is such that Al: 1 to 6%, Mn: 0.5% or less, trace elements are 0.2% or less, and the balance is Mg and inevitable impurities. It is good to use an extension. Such wrought materials include, for example, ASTM standard AZ31 alloy, A
M20 alloy is suitable. The reason for using a thin plate material having a thickness of 3 mm or less is as follows. When using a magnesium alloy sheet material having a thickness of more than 3 mm to forge a thin case having a thickness of 0.2 to 1.0 mm at the thinnest point, the rolling reduction of the forging process must be increased. The metal flow of the magnesium alloy at the time of forging becomes remarkable, and recrystallized fine particles may appear along the metal flow or may be segregated. For this reason,
It is preferable to use a magnesium alloy sheet material having a thickness of 3 mm or less.
【００１５】また、本発明においては、上側筐体１、下
側筐体５およびバッテリーケース蓋１０の内側部の底部
１ａ、５ａの表面に微細な凹凸部を形成する。この凹凸
部を形成する範囲は、底部１ａ、５ａの可能な限り広い
範囲とすることが好ましい。例えば、上側筐体１の操作
ボタン用開口部２の間の平坦部にも凹凸部を形成する。
また、この凹凸部の表面の平均粗さＲａは、０．０１〜
０．２ｍｍになるように成形することが好ましい。この
ように微細な凹凸部を形成することにより、筐体内部の
電子回路から発生した電磁波は、この凹凸部により吸収
されて反射を防止することができ、渦電流の発生による
損失で減衰する。この作用により、携帯電話の回路基板
８等から発生した電磁波は、携帯電話器の外部への漏洩
を極力少なくすることができ、また電子回路の誤動作も
防止することができる。さらに、本発明においては、マ
グネシウムの電気抵抗率は鋳造状態より圧延（鍛造）状
態のほうが高くなる。従って、マグネシウム合金を鋳造
により成形した筐体と比較して、鍛造により成形した本
発明の携帯電話用筐体の方が電磁波の外部への漏洩防止
効果は大となる。Further, in the present invention, fine irregularities are formed on the surfaces of the bottom portions 1a, 5a of the inner portions of the upper case 1, the lower case 5, and the battery case lid 10. It is preferable that the range in which the uneven portion is formed is as wide as possible of the bottoms 1a and 5a. For example, an uneven portion is also formed on a flat portion of the upper housing 1 between the operation button openings 2.
The average roughness Ra of the surface of the uneven portion is 0.01 to
It is preferable to mold to 0.2 mm. By forming such fine irregularities, the electromagnetic waves generated from the electronic circuit inside the housing can be absorbed by the irregularities to prevent reflection, and are attenuated by the loss due to the generation of the eddy current. By this operation, the leakage of the electromagnetic waves generated from the circuit board 8 of the mobile phone to the outside of the mobile phone can be minimized, and the malfunction of the electronic circuit can be prevented. Furthermore, in the present invention, the electrical resistivity of magnesium is higher in the rolled (forged) state than in the cast state. Accordingly, the effect of preventing leakage of electromagnetic waves to the outside is greater in the case for a mobile phone of the present invention formed by forging than in a case formed by casting a magnesium alloy.
【００１６】続いて、本発明の携帯電話用筐体の製造方
法について説明する。本発明の携帯電話用筐体は、次の
手順により製造することができる。 １）板厚３ｍｍ以下のマグネシウム合金からなる薄板素
材を３００〜５００℃に加熱する（予備加熱工程）。こ
の薄板素材としては、前記の通り鍛造性に優れたマグネ
シウム合金であるＡＳＴＭ規格のＡＺ３１合金、ＡＭ２
０合金からなる展伸材を用いることが好ましい。 ２）この予備加熱された薄板素材を３００〜５００℃に
保持しながら、３００〜４５０℃に加熱保持された金型
内に載置して、１００〜３０００ＭＰａの成形荷重を負
荷しながら１〜５００ｍｍ／秒の鍛造速度、７５％以下
の圧下率で薄板素材を展伸させ周壁部を有する有底形状
成形体に鍛造加工する（荒鍛造工程）。なお、鍛造速度
を上記のようにする理由は次の通りである。すなわち、
鍛造速度が５００ｍｍ／秒を超えると、メタルフローが
鍛造速度に円滑に追従できなくなり、メタルフローに乱
れが生じて所望の形状が得られなくなる。また、鍛造速
度が１ｍｍ／秒未満では、薄板素材の温度が低下して良
好な鍛造成形精度が得られなくなり、また生産性も低下
する。荒鍛造工程において、圧下率を７５％以下にして
荒鍛造する理由は、７５％を超えると鍛造加工による発
熱が付加されて、発火・燃焼する恐れがあるからであ
る。安全性を考慮すると５０％以下の圧下率で荒鍛造す
ることが好ましい。また、この圧下率の加工は一度の鍛
造で行うことも可能であるが、複数回に分けて鍛造を行
ってもかまわない。Next, a description will be given of a method of manufacturing the mobile phone casing of the present invention. The mobile phone casing of the present invention can be manufactured by the following procedure. 1) A sheet material made of a magnesium alloy having a sheet thickness of 3 mm or less is heated to 300 to 500 ° C (preheating step). Examples of the thin plate material include an ASTM-standard AZ31 alloy, which is a magnesium alloy excellent in forgeability as described above, and AM2.
It is preferable to use a wrought material made of a zero alloy. 2) While holding the preheated thin plate material at 300 to 500 ° C., place it in a mold heated and held at 300 to 450 ° C. and apply a forming load of 100 to 3000 MPa to 1 to 500 mm. The thin sheet material is stretched at a forging speed of / sec and a rolling reduction of 75% or less, and forged into a bottomed molded body having a peripheral wall portion (rough forging step). The reason for setting the forging speed as described above is as follows. That is,
When the forging speed exceeds 500 mm / sec, the metal flow cannot smoothly follow the forging speed, and the metal flow is disturbed and a desired shape cannot be obtained. If the forging speed is less than 1 mm / sec, the temperature of the thin sheet material is lowered, so that good forging accuracy cannot be obtained, and the productivity also decreases. The reason for performing the rough forging with the reduction ratio of 75% or less in the rough forging process is that if it exceeds 75%, heat generated by the forging is added, and there is a risk of ignition and burning. Considering safety, it is preferable to perform rough forging at a draft of 50% or less. Further, the processing of the rolling reduction can be performed by one forging, but the forging may be performed in a plurality of times.
【００１７】３）上記２）の荒鍛造工程で成形した有底
形状成形体を３００〜５００℃に加熱した後、この有底
形状成形体を３００〜４００℃に加熱保持された仕上鍛
造用金型内に載置して、３００〜５００℃に保持しなが
ら１００〜２０００ＭＰａの成形荷重を負荷しながら１
〜２００ｍｍ／秒の鍛造速度で圧下率３０％以下の鍛造
加工を施す。この処理により、操作ボタン用開口部２お
よび液晶表示装置用開口部３はまだ打ち抜きを行ってい
ないが、図２に示すような上側筐体１を成形することが
できる。鍛造成形であるため、上側筐体１、下型筐体５
およびバッテリーケース蓋１０の厚さのうち最も薄い部
分は０．２〜１．０ｍｍにすることができる。なお、仕
上鍛造工程の圧下率を荒鍛造工程より小さくする理由
は、仕上鍛造工程は加工量より成形性が重要であり、加
工硬化を最小限に押さえるためには３０％以下にするこ
とが好ましいからである。また、この圧下率の加工は一
度の鍛造で行うことも可能であるが、複数回に分けて鍛
造を行ってもかまわない。 ４）続いて、筐体の内側部の底面の平均粗さＲａを０．
０１〜０．２ｍｍにするためにプレス加工を行う。この
プレス加工は、平均粗さＲａを０．０１〜０．２ｍｍに
対応する微小な凹凸部を全面に設けた上金型を用いて行
うことができる。このとき、筐体は必ずしも加熱する必
要はない。3) After heating the bottomed shaped body formed in the rough forging step of 2) above to 300 to 500 ° C., the bottomed shaped body is heated and held at 300 to 400 ° C. for finishing forging. Place it in a mold and apply a molding load of 100 to 2000 MPa while maintaining it at 300 to 500 ° C.
Forging with a draft of 30% or less is performed at a forging speed of 200 mm / sec. By this processing, the opening 2 for the operation button and the opening 3 for the liquid crystal display device have not been punched yet, but the upper casing 1 as shown in FIG. 2 can be formed. Because it is forged, the upper housing 1 and the lower housing 5
And the thinnest part of the thickness of the battery case lid 10 can be 0.2 to 1.0 mm. The reason why the rolling reduction in the finish forging process is smaller than that in the rough forging process is that the finish forging process requires more formability than the processing amount, and is preferably 30% or less in order to minimize work hardening. Because. Further, the processing of the rolling reduction can be performed by one forging, but the forging may be performed in plural times. 4) Subsequently, the average roughness Ra of the bottom surface of the inner portion of the housing is set to 0.
Press working is performed to make the thickness from 01 to 0.2 mm. This press working can be performed using an upper mold in which minute uneven portions corresponding to an average roughness Ra of 0.01 to 0.2 mm are provided on the entire surface. At this time, the housing does not necessarily need to be heated.
【００１８】５）続いて、操作ボタン用開口部２、液晶
表示装置用開口部３等の開口部を打ち抜きプレス加工に
より打ち抜きを行う。この打ち抜きプレス加工を行うと
きも筐体は必ずしも加熱する必要はない。本発明におい
て、筐体用マグネシウム合金材として鍛造性に優れたＡ
ＳＴＭ規格のＡＺ３１合金、ＡＭ２０合金からなる展伸
材を用いると、上記プレス加工により打ち抜いた断面の
状態は極めて滑らかな状態となり、打ち抜き面のバリの
発生も無く、かつ製品として組み立てたときに、操作ボ
タンとこの断面との接触が非常に円滑になるという効果
も生じる。 ６）アンテナ用孔７およびネジ孔１１、１２の機械加工
を行う。上記の鍛造加工等により得られたマグネシウム
合金製の筐体は、酸化して金属光沢を失う恐れがある。
これを防止するために、仮防食、塗装等の表面処理を行
うが、特に、陽極酸化皮膜処理により酸化皮膜を形成す
ることで、通常行われている塗装では得られない優れた
防食性および合金素地を生かした金属光沢を有するマグ
ネシウム合金製筐体を得ることができる。5) Subsequently, the openings such as the operation button opening 2 and the liquid crystal display device opening 3 are punched by punching and press working. The casing does not necessarily need to be heated when performing the punching press working. In the present invention, A which is excellent in forgeability as a magnesium alloy material for a casing is used.
When using the wrought material made of STM standard AZ31 alloy and AM20 alloy, the state of the cross section punched by the above press working becomes extremely smooth, there is no generation of burrs on the punched surface, and when assembled as a product, There is also an effect that contact between the operation button and this cross section becomes very smooth. 6) Machine the antenna hole 7 and the screw holes 11 and 12. The magnesium alloy housing obtained by the forging or the like described above may be oxidized and lose metallic luster.
In order to prevent this, surface treatment such as temporary corrosion protection and painting is performed. In particular, by forming an oxide film by anodic oxidation film treatment, excellent corrosion protection and alloys that can not be obtained by ordinary painting are performed. It is possible to obtain a magnesium alloy housing having a metallic luster utilizing the base.
【００１９】上記本発明の実施形態の説明では、操作ボ
タンを保護するためにフリップを用いた携帯電話につい
て説明したが、本発明はフリップを設けない携帯電話に
適用できることはもちろんである。また、本発明におい
ては、次のような副次的な効果も生じる。マグネシウム
合金は振動減衰能が高く、特に鋳造材よりも圧延材の方
がより高くなることが知られている。従って、本発明の
ようにマグネシウム合金の薄板素材を鍛造により成形し
た筐体を使用すると、スピーカ用開口部から出た音声の
音質は一層向上する効果が生じる。In the above description of the embodiment of the present invention, a mobile phone using a flip for protecting operation buttons has been described. However, the present invention can be applied to a mobile phone without a flip. In the present invention, the following secondary effects also occur. It is known that a magnesium alloy has a high vibration damping ability, and in particular, a rolled material is higher than a cast material. Therefore, when a casing formed by forging a thin sheet of a magnesium alloy as in the present invention is used, the sound quality of the sound output from the speaker opening is further improved.
【００２０】[0020]
【発明の効果】以上説明した本発明は次の効果を有して
いる。すなわち、マグネシウム合金圧延薄板素材を鍛造
などの塑性加工により、成形した筐体であるために、ダ
イカスト等の鋳造により成形した筐体と比較して筐体自
体の電気抵抗率が高くなり、それだけ、電磁波の遮蔽・
吸収が向上する。さらに、筐体の内側部の底部に設けた
微小な凹凸部により電磁波を吸収して減衰させることが
できるために、電子回路の誤動作も防止することができ
る。また、筐体の肉厚のうち、主要部の肉厚を０．２〜
１．０ｍｍにしても十分な剛性を保持することが可能で
あり、携帯通信端末の軽量化に貢献することができる。The present invention described above has the following effects. That is, since the magnesium alloy rolled sheet material is a casing formed by plastic working such as forging, the electrical resistivity of the casing itself is higher than that of a casing formed by casting such as die casting, and accordingly, Electromagnetic shielding
Improves absorption. Further, since the electromagnetic waves can be absorbed and attenuated by the minute uneven portions provided at the bottom of the inner portion of the housing, malfunction of the electronic circuit can be prevented. Also, of the thickness of the housing, the thickness of the main part is 0.2 to
Even if the thickness is 1.0 mm, sufficient rigidity can be maintained, which can contribute to weight reduction of the mobile communication terminal.
【図１】 本発明の実施形態を説明するための携帯電話
の展開組立図であり、表側から見た状態を示す図であ
る。FIG. 1 is an exploded view of a mobile phone for explaining an embodiment of the present invention, and is a view showing a state viewed from the front side.
【図２】 本発明の実施形態を説明するための携帯電話
の展開組立図であり、裏側から見た状態を示す図であ
る。FIG. 2 is an exploded view of the mobile phone for explaining the embodiment of the present invention, and is a diagram showing a state viewed from the back side.
１ 上側筐体、 ２ 操作ボタン用開口部、 ３
液晶表示用開口部、５ 下側筐体、 ８ 回路基
板、１０ バッテリーケース蓋1 upper housing, 2 opening for operation button, 3
Liquid crystal display opening, 5 lower case, 8 circuit board, 10 battery case lid
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２２Ｆ 1/00 ６８３ Ｈ０４Ｂ 7/26 Ｖ Ｆターム(参考） 4E087 BA03 CB02 HA91 4E360 AB03 GA34 GB26 GC04 5K067 AA06 BB04 EE02 KK17 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C22F 1/00 683 H04B 7/26 VF term (Reference) 4E087 BA03 CB02 HA91 4E360 AB03 GA34 GB26 GC04 5K067 AA06 BB04 EE02 KK17
Claims (4)
が施され、主要部の肉厚が０．２〜１．０ｍｍであり、
電気抵抗率が４．３〜４．８０μΩ・ｃｍであることを
特徴とする電磁波シールド性に優れた携帯通信端末用筐
体。1. A magnesium alloy rolled sheet material is subjected to plastic working, and a main part has a thickness of 0.2 to 1.0 mm,
A housing for a portable communication terminal having an excellent electromagnetic wave shielding property, wherein an electric resistivity is 4.3 to 4.80 μΩ · cm.
ることを特徴とする請求項１に記載の電磁波シールド性
に優れた携帯通信端末用筐体。2. The portable communication terminal casing according to claim 1, wherein the plastic working is hot or warm forging.
に微細な凹凸部が形成されていることを特徴とする請求
項１又は請求項２に記載の電磁波シールド性に優れた携
帯通信端末用筐体。3. The mobile communication according to claim 1, wherein a fine uneven portion is formed on a surface of an inner portion of the mobile communication terminal housing. Terminal housing.
平均粗さＲａが０．０１〜０．２ｍｍであることを特徴
とする請求項３記載の電磁波シールド性に優れた携帯通
信端末用筐体。4. The portable communication having excellent electromagnetic wave shielding properties according to claim 3, wherein the average roughness Ra of the concave and convex portions formed on the surface of the inner portion of the housing is 0.01 to 0.2 mm. Terminal housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36799699A JP4366673B2 (en) | 1999-12-24 | 1999-12-24 | Housing for mobile communication terminals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP36799699A JP4366673B2 (en) | 1999-12-24 | 1999-12-24 | Housing for mobile communication terminals |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001185865A true JP2001185865A (en) | 2001-07-06 |
| JP4366673B2 JP4366673B2 (en) | 2009-11-18 |
Family
ID=18490718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP36799699A Expired - Fee Related JP4366673B2 (en) | 1999-12-24 | 1999-12-24 | Housing for mobile communication terminals |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4366673B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010079452A (en) * | 2001-07-20 | 2001-08-22 | 이상호 | Parts manufacturing method and apparatus for preventing electromagnetic interference using magnesium hot working |
| KR100476673B1 (en) * | 2002-10-01 | 2005-03-18 | 한국과학기술연구원 | The process and equipment for manufacturing package housing and its components for the optical communication electronic device |
| JP2007050424A (en) * | 2005-08-17 | 2007-03-01 | Hitachi Metals Ltd | Housing for electronic apparatus and producing method thereof |
| WO2017047443A1 (en) * | 2015-09-18 | 2017-03-23 | 東レ株式会社 | Housing |
| US20190047018A1 (en) * | 2017-08-11 | 2019-02-14 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Component for a motor vehicle, and method for producing a coated component from a magnesium material |
-
1999
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010079452A (en) * | 2001-07-20 | 2001-08-22 | 이상호 | Parts manufacturing method and apparatus for preventing electromagnetic interference using magnesium hot working |
| KR100476673B1 (en) * | 2002-10-01 | 2005-03-18 | 한국과학기술연구원 | The process and equipment for manufacturing package housing and its components for the optical communication electronic device |
| JP2007050424A (en) * | 2005-08-17 | 2007-03-01 | Hitachi Metals Ltd | Housing for electronic apparatus and producing method thereof |
| WO2017047443A1 (en) * | 2015-09-18 | 2017-03-23 | 東レ株式会社 | Housing |
| US20180284845A1 (en) * | 2015-09-18 | 2018-10-04 | Toray Industries, Inc. | Housing |
| EP3352543A4 (en) * | 2015-09-18 | 2019-04-10 | Toray Industries, Inc. | HOUSING |
| US20190047018A1 (en) * | 2017-08-11 | 2019-02-14 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Component for a motor vehicle, and method for producing a coated component from a magnesium material |
| US10828670B2 (en) * | 2017-08-11 | 2020-11-10 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Component for a motor vehicle, and method for producing a coated component from a magnesium material |
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| Publication number | Publication date |
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| JP4366673B2 (en) | 2009-11-18 |
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