201041756 . 六、發明說明： . 【發明所屬之技術領域】 本發明涉及一殼體，尤其涉及一應用於檇帶式電子裝 置之殼體及其製備方法。 【先前技術】 隨著電子產品之快速發展，行動電話、MP3播放器、 個人數位助理、筆記型電腦等檇帶式電子裝置之使用已非 常普遍。而隨著個性化，流行趨勢之演變，越來越多檇帶 〇 式電子裝置使用鎂合金、鋁合金金及不銹鋼等金屬材質來 製備殼體，以增強其結構強度。 為使攜帶式電子裝置具有較佳外觀及特殊手感，有時 需要於金屬殼體上形成一些裝飾性圖案或紋路。 一殼體，包括金屬基殼、形成於該金屬基殼上之透明 層、形成於該透明層上之塗色層及形成于該塗色層上之鐳 射雕刻圖案。 該殼體之鐳射雕刻圖案雖有一定立體效果，惟，該殼 ^ 體之顏色較為單一，視覺效果不佳。 【發明内容】 有鑑於此，有必要提供一視覺效果較佳之殼體及其製 備方法。 一殼體，包括金屬製成之基殼。該殼體從基殼表面向 外依次形成有化學鐘層、底漆層、中塗層、金屬質感層及 透明保護層。其中，中塗層上形成有雷射雕刻圖案，該雷 射雕刻圖案之深度大於金屬質感層之厚度。 3 201041756 • 一殼體之製造方法，包括以下步驟：製備金屬基殼； .對金屬基殼進行化成處理，於其表面形成化學鍍層；於化 學鍍層上形成底漆層；於底漆層上塗布中塗塗料，固化形 成中塗層；於中塗層上進行雷射雕刻，形成雷射雕刻圖案； 於中塗層及雷射雕刻圖案上塗布金屬漆，固化形成金屬質 感層，該金屬質感層之厚度小於雷射雕刻圖案之深度；於 金屬質感層上塗布透明漆，固化形成透明保護層。 該殼體之雷射雕刻圖案可深入中塗層之内部，使該圖 © 案具有較強之立體感和層次感。而附著於雷射雕刻圖案之 上之金屬質感層一方面可使殼體具有較強之金屬質感，另 一方面還使雷射雕刻圖案產生了反光及多角度變化等較佳 之視覺效果。 【實施方式】 下面將結合附圖及實施方式對本發明之殼體及其製備 方法作進一步詳細說明。 0 請參閱圖1，所示為本發明實施方式之殼體10，其包 括基殼11。殼體10從基殼11表面向外依次形成之化學鍍 層12、底漆層13、中塗層14、金屬質感層17及透明保護 層19。中塗層14上還形成有雷射雕刻圖案15，雷射雕刻 圖案15之深度大於金屬質感層17之厚度。 基殼11由金屬製成。形成基殼11之材料可為鎂合金、 鋁合金等金屬。 化學鍍層12主要用於防止基殼11被氧化，同時還可 改善基殼11之塗裝附著性。化學鍍層12由基殼11經過化 4 201041756 . 成處理後得到。 . 底漆層13用於進一步防止基殼11被氧化，同時還可 作為中塗層14之載體。本實施方式中，底漆層13由粉體 漆固化層132及液體漆固化層134構成。 粉體漆固化層132形成於化學鍍層12之上，其主要含 有聚酯樹脂、環氧樹脂及顏料。粉體漆固化層132主要用 於遮蔽基殼11之表面缺陷，並且能夠增強化學鍍層12與 液體漆固化層134之間之黏附力。粉體漆固化層132可為 ® 任意顏色，優選為吸收雷射光能量較強之黑色。粉體漆固 化層132之厚度為25微米至50微米。 液體漆固化層134形成於粉體漆固化層132之上，其 主要含有丙烯酸樹脂、聚酯樹脂、環氧樹脂、氨基樹脂、 碳黑、丙烯酸酯共聚體、丙二醇曱醚醋酸酯及丁酯。液體 漆固化層134主要用於進一步遮蔽基殼n之表面缺陷，以 增強與中塗層14之間之黏附力。液體漆固化層134可為任 Q 意顏色，優選為吸收雷射光能量較強之黑色。液體漆固化 層134之厚度為15微米至2〇微米。 中塗層14形成於液體漆固化層134之上，其主要含有 丙烯酸樹脂、聚酯樹脂、環氧樹脂、氨基樹脂、顏料、丙 烯酸酯共聚體、丙二醇甲醚醋酸酯及丁酯。中塗層14主要 用於提向基殼11表面之光滑度，並可作為雷射雕刻圖案 17之载體。中塗層14之顏色由其含有之顏料所決定，其 厚度為15微米至80微米。 雷射雕刻圖案15形成于中塗層14上，其由雷射雕刻設備所 5 201041756 .產生之雷射光照射中塗層14之後形成。雷射雕刻圖案15之深度 . 為 L1。 金屬質感層Π形成于中塗層14及雷射雕刻圖案15之 上，其主要含有丙烯酸樹脂、聚酯樹脂、環氧樹脂、氨基 樹脂、奈米顏料、三氧化二鋁奈米顆粒、變性亞克力樹脂、 丙烯酸酯共聚體、丙二醇曱醚醋酸酯及丁酯。其中，三氧 化二鋁奈米顆粒主要起到產生金屬光澤之作用。金屬質感 層17之厚度為L2，且L1>L2，因此金屬質感層17可均勻 ® 附著於組成雷射雕刻圖案15之線條之底部與側面。L2可 為2微米至7微米之間。金屬質感層17之顏色由其含有之 奈米顏料所決定。金屬質感層17 —方面可使雷射雕刻圖案 15乃至整個殼體10產生強烈之金屬質感，另一方面還可 使雷射雕刻圖案15上之圖案產生反光及立體、多角度變化 之效果。 透明保護層19形成於金屬質感層17之上，其主要含 ^ 有丙烯酸樹脂、聚醋樹脂、環氧樹脂、氨基樹脂、二氧化 矽、丙烯酸酯共聚體、丙二醇曱醚醋酸酯及丁酯。透明保 護層19主要用於保護雷射雕刻圖案15及金屬質感層17不 易被磨損，還可提高殼體10表面之光澤度。透明保護層 19之厚度為20微米至80微米。 本發明之殼體10是於基殼11上依次形成化學鍍層 12、底漆層13、中塗層14後，再運用雷射雕刻技術於中 塗層14上形成各種形狀之圖案，因此，組成該圖案之線條 可深入中塗層14之内部，從而使該圖案具有立體效果之立 6 201041756 體層次感。由於金屬質感層17較薄，因此其可均勻附著於 組成雷射雕刻圖案15之線條之底部與側面。從不同角度觀 察殼體10，該圖案之底部與側面對光線之反射會有少許差 別，經透明保護層19之折射後，該差別被進一步放大，由 此可產生不一樣之視覺效果，從而賦予該圖案極佳之視覺 生命力。另，金屬質感層17還可使雷射雕刻圖案15及殼 體10產生較為強烈之金屬質感，進一步改善基殼11之外 觀。 可理解，若基殼11之表面缺陷較少，且化學鍍層12 與液體漆固化層134之黏著力較強，粉體漆固化層132亦 可省略。此時液體漆固化層134直接形成於化學鍍層12上。 另，若粉體漆固化層132之遮蔽效果較好，液體漆固 化層134亦可省略。此時中塗層14直接形成於粉體漆固化 層132上。 一製備上述殼體10之方法包括以下步驟： 步驟1，製備金屬基殼11，基殼11可由鎂合金、鋁合 金等金屬原料藉由衝壓、鑄造等方式加工成型。 步驟2,對基殼11進行化成處理，以於基殼11表面形 成化學鍍層12。例如，可將鎂合金製備之基殼11浸入含 有磷酸鹽之化成溶液中，以形成含有磷酸鎂之化學鍍層 12。所形成之化學鍍層21可顯著改善基殼11之抗氧化性 和塗裝附著性。 步驟3，於化學鍍層12上形成底漆層13。底漆層13 可藉由以下方式形成：首先於化學鍍層12上塗布粉體漆， 7 201041756 固化形成粉體漆固化層132。其中該粉體漆主要含有聚酯 樹脂、環氧樹脂及顏料。塗布之方法可為手塗或喷塗。固 化溫度為150度至200度，固化時間為10分鐘至30分鐘。 接著，於粉體漆固化層132上塗布液體漆，固化形成液體 漆固化層134。其中該液體漆含有丙烯酸樹脂、聚酯樹脂、 環氧樹脂、氨基樹脂、碳黑、丙烯酸酯共聚體、丙二醇甲 醚醋酸酯及丁酯。固化溫度為130度至180度，固化時間 為10分鐘至30分鐘。 0 步驟4，於底漆層13上塗布中塗塗料，固化形成中塗 層14。其中該中塗塗料主要含有丙烯酸樹脂、聚g旨樹脂、 環氧樹脂、氨基樹脂、顏料、丙烯酸酯共聚體、丙二醇甲 醚醋酸酯及丁酯。塗布之方法可為手塗或喷塗。固化溫度 可為50度至180度，固化時間為10分鐘至30分鐘。 步驟5，於中塗層14上進行雷射雕刻，即將形成有中 塗層14之基殼11放置於雷射雕刻設備下，使用雷射光對 q 中塗層14進行照射。於照射過程中，中塗層14被照射之 部位吸收雷射光之能量瞬間氣化而形成深度為L1之雷射雕 刻圖案15。另，藉由調節雷射雕刻設備之輸出功率，還可 對雕刻圖案之線寬、線距、線型及深度進行控制，以呈現 出各類圖案樣式。 步驟6,於中塗層14及雷射雕刻圖案15上塗布金屬漆， 固化形成厚度為L2之金屬質感層17，且L2<L1。其中該金屬 漆主要含有丙稀酸樹脂、聚S旨樹脂、ί哀氧樹脂、氣基樹脂、 奈米顏料、三氧化二鋁奈米顆粒、變性亞克力樹脂、丙烯 8 201041756 酸酯共聚體、丙二醇曱醚醋酸酯及丁酯。塗布之方法可為 • 手塗或喷塗。固化溫度為50度至180度，固化時間為1〇 分鐘至30分鐘。 步驟7，於金屬質感層15及雷射雕刻圖案17上塗布 透明漆’固化形成透明保護層19。其中該透明漆主要含有 丙烯酸樹脂、聚酯樹脂、環氧樹脂、氨基樹脂、二氧化矽、 丙烯酸酯共聚體、丙二醇曱醚醋酸酯及丁酯。塗布之方法 可為手塗或喷塗。固化溫度為50至180度，固化時間為 ® 10分鐘至30分鐘。 可理解，若基殼11經過化成處理後表面缺陷較少，且 化學鍍層12與液體漆固化層134之黏著力較強，步驟3中 塗布粉體漆以形成粉體漆固化層132之過程可省略，此 時’底漆層13藉由於化學鍍層12上塗布液體漆後固化形 成。 另，若粉體漆固化層132之光滑度較好，步驟3中塗 ❹ 布液體漆以形成液體漆固化層134之過程可省略，此時， 底漆層13藉由於化學鍍層12上塗布液體漆後固化形成。 實施方式一： 使用鎂合金壓鑄成型得到一基殼。將基殼浸入含有磷 酸鹽之化成溶液中形成一化學鍍層。於化學鍵層上塗布含 有聚酯樹脂、環氧樹脂及顏料之粉體漆。於150〜200。(：之 溫度下烘烤10〜30分鐘’固化形成膜厚為25〜50微米之粉 體漆固化層。於粉體漆固化層上塗布含有丙烯酸樹脂、聚 酯樹脂、環氧樹脂、氨基樹脂、顏料、丙烯酸酯共聚體、 9 201041756 ' 丙二醇曱醚醋酸酯及丁酯之中塗塗料。於50〜18CTC之溫度 - 下供烤10〜30分鐘’固化形成膜厚為ι5〜8〇微米之中塗層。 使用雷射雕刻設備於中塗層上進行雕刻，形成雷射雕刻圖 案；於雷射雕刻圖案上塗布含有丙烯酸樹脂、聚酯樹脂、 裱氧樹脂、氨基樹脂、奈米顏料、三氧化二鋁奈米顆粒、 憂性亞克力樹脂、丙烯酸酯共聚體、丙二醇甲醚醋酸酯及 丁酯之金屬色塗料，於5〇〜18〇。〇之溫度下烘烤1〇〜3〇分 〇 鐘，固化形成膜厚為2〜7微米之金屬質感層，該金屬質感 層之厚度小於雷射雕刻圖案之深度。及於金屬質感層上塗 布含有丙烯酸樹脂、聚酯樹脂、環氧樹脂、氨基樹脂、二 氧化矽、丙烯酸酯共聚體、丙二醇甲醚醋酸酯及丁酯之透 月漆，於50〜180 C之溫度下烘烤1〇〜3〇分鐘，固化形成膜 厚為20〜80微米之透明保護層，形成殼體。 實施方式二： 使用鋁合金衝壓成型得到一基殼。將基殼浸入含有磷 〇酸鹽之化成溶液中形成一化學鏡層。於化學鍛層上塗布含 有丙烯酸樹脂、聚醋樹脂、環氧樹脂、氨基樹脂、碳黑、 丙烯酸醋共聚體、丙二醇曱鱗醋酸酯及丁醋之液體漆，於 於130〜18CTC之溫度下烘烤1〇~3〇分鐘，固化形成膜厚為 15〜20微米之液體漆固化層。於液體漆固化層上塗布含有 丙烯酸樹脂、聚酯樹脂、環氧樹脂、氨基樹脂、顏料^丙 烯酸酯共聚體、丙二醇曱醚醋酸酯及丁酯之中塗塗料。於 50〜180°C之溫度下烘烤10〜3〇分鐘，固化形成膜厚為〜⑽ 微米之中塗層。使用雷射雕刻設備於中塗層上進行雕刻， 201041756 形成雷射雕_ l於雷射_㈣上塗 脂、聚醋樹脂、環氧樹脂、氨蘭脂、 有两烯酉夂树 二_顆粒、變性亞克二=米顏料、-氧化 兄刀娜_旨共聚體二 醇甲醚醋咖旨及丁_之金屬色塗料，於5(M8q 烘烤i 〇.分鐘，固化形成膜厚為2〜7微米之質皿又下 該金屬質感層之厚度小於雷射雕刻圖案之深度。及^ 質感層上塗布含有丙烯酸樹脂、聚輯脂、環氧樹脂、氨 基樹脂、二乳㈣共聚體n甲醚醋酸醋 及丁醋之透:漆，於5G〜18(rc之溫度下埃烤iQ〜3〇分鐘， 固化形成膜厚為20〜80微米之透明保護層，形成殼體。 實施方式三： < 使用鎂合金壓鑄成型得到一基殼。將基殼浸入含有攝 酸鹽之化成溶液中形成-化學㈣。於化學鍍層上塗布含 有聚酯樹脂、環氧樹脂及顏料之粉體漆。於15〇〜2〇〇。〇之 溫度下烘烤10〜30分鐘，固化形成膜厚為25〜5〇微米之粉 〇體漆固化層。於粉體漆固化層上塗布含有丙烯酸樹脂、聚 酯樹知、環氧樹脂、氨基樹脂、碳黑、丙烯酸酯共聚體、 丙二醇曱醚醋酸酯及丁酯之液體漆。於13〇〜18(rc之溫度 下烘烤10〜30分鐘，固化形成獏厚為15〜2〇微米之液體漆 固化層。於液體漆固化層上塗布主要含有丙烯酸樹脂、聚 酉曰樹爿a、％氧樹脂、氨基樹脂、顏料、丙烯酸酯共聚體、 丙二醇曱醚醋酸酯及丁酯之中塗塗料。於50〜18(TC之溫度 下烘烤10〜30分鐘，固化形成膜厚為15〜8〇微米之中塗層。 使用雷射雕刻設備於中塗層上進行離刻，形成雷射雕刻圖 201041756 環氧樹r、气美 樹脂、聚_樹脂、 邊性亞克力樹脂、丙烯 、、粒、 丁酉旨之金屬色冷料 &一醇甲_醋酸醋及 於，面备取!* 土於50〜180C之溫度下烘烤10〜％分 = ^成膜厚為2〜7微米之金屬質感層，該金屬 :之厚度小於雷射雕刻圖案之深度。及； ΐ含有丙__、聚賴脂、環氧難、氨基^ ! Ο 〇 氣化石夕、丙烯_旨共聚體、丙二醇曱醚醋酸醋及丁醋之透 :漆，於50〜18crc之溫度下供烤10〜30分鐘，固化形成膜 厚為20〜80微米之透明保護層，形成殼體。 ^綜上所述，本發明確已符合發明專利之要件，遂依法 提出專利中請。惟，以上所述者僅為本發明之較佳實施方 式’自不能以此限制本案之申請專利_。舉凡熟悉本案 技藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 係本發明實施方式之殼體之剖面示意圖。 主要元件符號說明】 殼體 10 基殼 化學鍍層 12 底漆層 粉體漆固化層 132 液體漆固化層 令塗層 14 雷射雕刻圖案 金屬質感層 17 透明保護層 11 13 134 15 圖 12 19201041756. VI. Description of the Invention: 1. Field of the Invention The present invention relates to a housing, and more particularly to a housing for an electronic cassette device and a method of fabricating the same. [Prior Art] With the rapid development of electronic products, the use of piggybacking electronic devices such as mobile phones, MP3 players, personal digital assistants, and notebook computers has become very common. With the evolution of personalization and fashion trends, more and more 〇-type electronic devices use metal materials such as magnesium alloy, aluminum alloy gold and stainless steel to prepare the shell to enhance its structural strength. In order to make the portable electronic device have a better appearance and a special hand feeling, it is sometimes necessary to form some decorative patterns or lines on the metal casing. A casing comprising a metal base shell, a transparent layer formed on the metal base shell, a color coating layer formed on the transparent layer, and a laser engraved pattern formed on the color coat layer. Although the laser engraving pattern of the casing has a certain three-dimensional effect, the color of the shell body is relatively simple and the visual effect is not good. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a housing having a better visual effect and a method of manufacturing the same. A housing comprising a base shell made of metal. The casing is formed with a chemical clock layer, a primer layer, an intermediate coating layer, a metal texture layer and a transparent protective layer in this order from the surface of the base shell. Wherein, the middle coating layer is formed with a laser engraving pattern, and the depth of the laser engraving pattern is greater than the thickness of the metal texture layer. 3 201041756 • A method of manufacturing a casing, comprising the steps of: preparing a metal base shell; forming a metal base shell to form an electroless plating layer on the surface; forming a primer layer on the electroless plating layer; coating the primer layer The intermediate coating is cured to form a medium coating; the laser engraving is performed on the middle coating to form a laser engraving pattern; the metal coating is applied on the middle coating and the laser engraving pattern to form a metal texture layer, and the metal texture layer is The thickness is less than the depth of the laser engraving pattern; the transparent lacquer is coated on the metal texture layer to form a transparent protective layer. The laser engraving pattern of the shell can penetrate into the interior of the middle coating, so that the image has a strong three-dimensional and layered feel. The metallic texture layer attached to the laser engraving pattern can make the casing have a strong metallic texture on the one hand, and the laser engraving pattern can produce better visual effects such as reflection and multi-angle variation on the other hand. [Embodiment] Hereinafter, a casing of the present invention and a method of manufacturing the same will be further described in detail with reference to the accompanying drawings and embodiments. Referring to Figure 1, there is shown a housing 10 in accordance with an embodiment of the present invention, which includes a base housing 11. The casing 10 is formed with an electroless plating layer 12, a primer layer 13, an intermediate coating layer 14, a metal texture layer 17, and a transparent protective layer 19, which are sequentially formed outward from the surface of the base casing 11. A laser engraving pattern 15 is also formed on the intermediate coating layer 14, and the depth of the laser engraving pattern 15 is greater than the thickness of the metal texture layer 17. The base case 11 is made of metal. The material forming the base shell 11 may be a metal such as a magnesium alloy or an aluminum alloy. The electroless plating layer 12 is mainly used to prevent the base shell 11 from being oxidized, and at the same time, to improve the coating adhesion of the base shell 11. The electroless plating layer 12 is obtained by the base shell 11 by chemical treatment 4 201041756 . The primer layer 13 serves to further prevent the base shell 11 from being oxidized while also serving as a carrier for the intermediate coat layer 14. In the present embodiment, the primer layer 13 is composed of a powder lacquer cured layer 132 and a liquid lacquer cured layer 134. The powder lacquer cured layer 132 is formed on the electroless plating layer 12, and mainly contains a polyester resin, an epoxy resin, and a pigment. The powder lacquer cured layer 132 is mainly used to shield the surface defects of the base shell 11 and to enhance the adhesion between the electroless plating layer 12 and the liquid lacquer cured layer 134. The powder lacquer cured layer 132 can be any color, preferably black which absorbs the energy of the laser light. The powder paint curing layer 132 has a thickness of 25 μm to 50 μm. The liquid lacquer cured layer 134 is formed on the powder lacquer cured layer 132, and mainly contains an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a carbon black, an acrylate copolymer, propylene glycol oxime ether acetate, and butyl ester. The liquid lacquer cured layer 134 is primarily used to further shield the surface defects of the base shell n to enhance the adhesion to the intermediate coating 14. The liquid lacquer cured layer 134 may be of any color, preferably black which absorbs the energy of the laser light. The liquid paint cured layer 134 has a thickness of from 15 micrometers to 2 micrometers. The intermediate coating layer 14 is formed on the liquid lacquer cured layer 134, which mainly contains an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. The intermediate coating layer 14 is mainly used for lifting the smoothness of the surface of the base shell 11 and serves as a carrier for the laser engraving pattern 17. The color of the intermediate coating 14 is determined by the pigment contained therein and has a thickness of from 15 micrometers to 80 micrometers. A laser engraving pattern 15 is formed on the intermediate coating layer 14, which is formed by the laser light generated by the laser engraving apparatus 5 201041756. The depth of the laser engraving pattern 15 is L1. The metal texture layer is formed on the intermediate coating layer 14 and the laser engraving pattern 15, and mainly comprises an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a nano pigment, a oxidized aluminum oxide particle, and a denatured acrylic. Resin, acrylate copolymer, propylene glycol oxime ether acetate and butyl ester. Among them, the lanthanum oxychloride nanoparticles mainly function to produce metallic luster. The metal texture layer 17 has a thickness L2 and L1 > L2, so that the metal texture layer 17 can be uniformly + adhered to the bottom and side of the line constituting the laser engraving pattern 15. L2 can be between 2 microns and 7 microns. The color of the metallic texture layer 17 is determined by the nano pigment contained therein. The metal texture layer 17 can produce a strong metallic texture to the laser engraving pattern 15 or the entire casing 10, and can also produce a reflective, three-dimensional, multi-angle effect on the pattern on the laser engraving pattern 15. A transparent protective layer 19 is formed on the metal texture layer 17, which mainly contains an acrylic resin, a polyester resin, an epoxy resin, an amino resin, cerium oxide, an acrylate copolymer, propylene glycol oxime ether acetate, and butyl ester. The transparent protective layer 19 is mainly used to protect the laser engraved pattern 15 and the metal texture layer 17 from being worn, and also to improve the gloss of the surface of the casing 10. The transparent protective layer 19 has a thickness of from 20 micrometers to 80 micrometers. The casing 10 of the present invention is formed by sequentially forming an electroless plating layer 12, a primer layer 13, and an intermediate coating layer 14 on the base shell 11, and then forming a pattern of various shapes on the intermediate coating layer 14 by using a laser engraving technique. The lines of the pattern can penetrate into the interior of the intermediate coating 14, so that the pattern has a three-dimensional effect. Since the metal texture layer 17 is thin, it can be uniformly attached to the bottom and side of the line constituting the laser engraving pattern 15. When the casing 10 is viewed from different angles, the bottom and the side of the pattern will have a slight difference in the reflection of the light. After the refraction of the transparent protective layer 19, the difference is further enlarged, thereby producing a different visual effect, thereby giving This pattern has excellent visual vitality. In addition, the metal texture layer 17 also causes the laser engraving pattern 15 and the shell 10 to have a relatively strong metallic texture, further improving the appearance of the base shell 11. It can be understood that if the surface defects of the base shell 11 are small and the adhesion between the electroless plating layer 12 and the liquid paint solidified layer 134 is strong, the powder paint cured layer 132 can also be omitted. At this time, the liquid lacquer cured layer 134 is directly formed on the electroless plating layer 12. Further, if the shading effect of the powder lacquer cured layer 132 is good, the liquid lacquer curing layer 134 may be omitted. At this time, the intermediate coat layer 14 is directly formed on the powder paint cured layer 132. A method of preparing the above-described housing 10 includes the following steps: Step 1, a metal base shell 11 is prepared, and the base shell 11 can be formed by stamping, casting, or the like from a metal material such as a magnesium alloy or an aluminum alloy. In step 2, the base shell 11 is subjected to a chemical conversion treatment to form an electroless plating layer 12 on the surface of the base shell 11. For example, the base shell 11 prepared of the magnesium alloy may be immersed in a chemical solution containing phosphate to form an electroless plating layer 12 containing magnesium phosphate. The formed electroless plating layer 21 can remarkably improve the oxidation resistance and coating adhesion of the base shell 11. In step 3, a primer layer 13 is formed on the electroless plating layer 12. The primer layer 13 can be formed by first applying a powder lacquer on the electroless plating layer 12, and 7 201041756 is cured to form a powder lacquer cured layer 132. The powder paint mainly contains a polyester resin, an epoxy resin and a pigment. The method of coating can be hand or spray. The curing temperature is from 150 to 200 degrees and the curing time is from 10 minutes to 30 minutes. Next, a liquid lacquer is applied to the powder lacquer cured layer 132 to be cured to form a liquid lacquer cured layer 134. The liquid paint contains an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a carbon black, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. The curing temperature is from 130 to 180 degrees and the curing time is from 10 minutes to 30 minutes. 0 Step 4, the intermediate coating is applied to the primer layer 13 and cured to form the intermediate coating layer 14. The intermediate coating material mainly contains an acrylic resin, a polyg resin, an epoxy resin, an amino resin, a pigment, an acrylate copolymer, propylene glycol methyl ether acetate, and butyl ester. The method of coating can be hand or spray. The curing temperature can be from 50 to 180 degrees and the curing time is from 10 minutes to 30 minutes. In step 5, laser engraving is performed on the intermediate coating 14, and the base shell 11 on which the intermediate coating 14 is formed is placed under the laser engraving apparatus, and the coating 14 in the q is irradiated with laser light. During the irradiation, the energy of the laser beam absorbed by the portion of the intermediate coating 14 is instantaneously vaporized to form a laser engraved pattern 15 having a depth of L1. In addition, by adjusting the output power of the laser engraving device, the line width, line spacing, line type and depth of the engraving pattern can also be controlled to present various pattern patterns. In step 6, a metal lacquer is applied to the intermediate coating layer 14 and the laser engraving pattern 15 to form a metal texture layer 17 having a thickness L2, and L2 < L1. The metal paint mainly comprises acrylic resin, polystyrene resin, oxidized oxygen resin, gas-based resin, nano pigment, aluminum oxide nano particle, denaturing acrylic resin, propylene 8 201041756 acid ester copolymer, propylene glycol Ethyl ether acetate and butyl ester. The method of coating can be: hand or spray. The curing temperature is from 50 to 180 degrees and the curing time is from 1 minute to 30 minutes. In step 7, a transparent lacquer is applied to the metal texture layer 15 and the laser engraved pattern 17 to form a transparent protective layer 19. The clear lacquer mainly contains acrylic resin, polyester resin, epoxy resin, amino resin, cerium oxide, acrylate copolymer, propylene glycol oxime ether acetate and butyl ester. The method of coating can be hand applied or sprayed. The curing temperature is 50 to 180 degrees and the curing time is ® 10 minutes to 30 minutes. It can be understood that if the surface defect of the base shell 11 after the chemical conversion treatment is small, and the adhesion between the electroless plating layer 12 and the liquid paint solidified layer 134 is strong, the process of applying the powder paint in the step 3 to form the powder paint cured layer 132 can be performed. Omitted, at this time, the primer layer 13 is formed by curing after coating the liquid coating on the electroless plating layer 12. In addition, if the smoothness of the powder paint cured layer 132 is good, the process of applying the liquid paint to form the liquid paint solid layer 134 in the step 3 can be omitted. At this time, the primer layer 13 is coated with the liquid paint by the chemical plating layer 12. After curing forms. Embodiment 1: A base shell is obtained by die casting of a magnesium alloy. The base shell is immersed in a solution containing a phosphate to form an electroless plating layer. A powder paint containing a polyester resin, an epoxy resin, and a pigment is applied to the chemical bond layer. At 150~200. (: baking at a temperature of 10 to 30 minutes) to form a solidified layer of powder paint having a film thickness of 25 to 50 μm. Coating the cured layer of the powder paint with acrylic resin, polyester resin, epoxy resin, amino resin , pigment, acrylate copolymer, 9 201041756 'propylene glycol oxime ether acetate and butyl ester coating. at 50~18CTC temperature - for baking for 10~30 minutes' curing to form a film thickness of ι5~8〇 micron Coating. Using a laser engraving device to engrave on the middle coating to form a laser engraving pattern; coating the laser engraving pattern with acrylic resin, polyester resin, epoxy resin, amino resin, nano pigment, and trioxide Metallic paint of bismuth nanoparticle, opaque acrylic resin, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester at 5〇~18〇. Bake at a temperature of 1〇~3〇分〇 Forming a metal texture layer having a film thickness of 2 to 7 micrometers, the thickness of the metal texture layer being less than the depth of the laser engraved pattern, and coating the metal texture layer with an acrylic resin, a polyester resin, an epoxy resin, and an ammonia. Base resin, cerium oxide, acrylate copolymer, propylene glycol methyl ether acetate and butyl ester lacquer, baked at 50~180 C for 1〇~3〇 minutes, solidified to form a film thickness of 20~80 A micron transparent protective layer forms a shell. Embodiment 2: A base shell is obtained by stamping an aluminum alloy. The base shell is immersed in a solution containing a phosphonium citrate to form a chemical mirror layer. Liquid paint of acrylic resin, polyester resin, epoxy resin, amino resin, carbon black, acrylic acid vinegar copolymer, propylene glycol squamous acetate and butyl vinegar, baked at a temperature of 130~18CTC for 1〇~3〇 minutes Curing to form a liquid lacquer cured layer having a film thickness of 15 to 20 microns. The liquid lacquer cured layer is coated with an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a pigment acrylate copolymer, and a propylene glycol oxime ether acetate. And butyl ester coating. Baking at 50~180 ° C for 10~3 〇 minutes, curing to form a coating with a thickness of ~ (10) microns. Engraving on the middle coating using laser engraving equipment, 201041756 Forming a laser engraving _ l on the laser _ (four) on the grease, polyester resin, epoxy resin, ammonia, two olefinic eucalyptus two particles, denatured yake two = rice pigment, - oxidation brother knife _ The metallized coating of the copolymer diol methyl ether vinegar vinegar and butyl _ is baked at 5 (M8q baking i 〇. minute, solidified to form a film having a film thickness of 2 to 7 μm and the thickness of the metal texture layer is less than The depth of the laser engraving pattern. And ^ The texture layer is coated with acrylic resin, polymer grease, epoxy resin, amino resin, di-milk (tetra) copolymer n-ether acetate vinegar and vinegar: lacquer, at 5G~18 (The temperature of rc is baked at iQ for 3 minutes, and cured to form a transparent protective layer having a film thickness of 20 to 80 μm to form a shell. Embodiment 3: < A base shell is obtained by die casting using a magnesium alloy. The base shell is immersed in a chemical solution containing the acid salt to form - Chemistry (4). A powder paint containing a polyester resin, an epoxy resin, and a pigment is applied to the electroless plating layer. At 15〇~2〇〇. Bake at a temperature for 10 to 30 minutes and solidify to form a powder having a film thickness of 25 to 5 μm. A liquid lacquer containing an acrylic resin, a polyester resin, an epoxy resin, an amino resin, a carbon black, an acrylate copolymer, propylene glycol oxime ether acetate, and butyl ester is applied onto the cured layer of the powder paint. Bake at a temperature of rc for 10 to 30 minutes at a temperature of rc for 10 to 30 minutes to form a liquid lacquer cured layer having a thickness of 15 to 2 μm. The liquid lacquer cured layer is mainly coated with acrylic resin and polyeucalyptus. a,% oxygen resin, amino resin, pigment, acrylate copolymer, propylene glycol oxime ether acetate and butyl ester coating. Baking at 50~18 (TC temperature for 10~30 minutes, curing to form a film thickness of 15 ~8 〇 micron coating. Using laser engraving equipment to engrave on the middle coating to form a laser engraving map 201041756 Epoxy resin, gas resin, poly-resin, edge acrylic resin, propylene, Granules, Ding Yu's metallic cold material & A-ol-acetic acid vinegar and noodles are prepared! * Soil is baked at a temperature of 50~180C. 10~% points = ^ Film thickness is 2~7 microns Metallic texture layer, the thickness of the metal: less than the depth of the laser engraving pattern; and; ΐ containing __, poly lyophile, epoxy difficult, amino ^ Ο 〇 gas fossil eve, propylene _ copolymer, propylene glycol 曱Ethyl acetate vinegar and vinegar vinegar: lacquer, baked at 50~18crc for 10~30 minutes, solid The transparent protective layer having a film thickness of 20 to 80 micrometers is formed to form a shell. In summary, the present invention has indeed met the requirements of the invention patent, and the patent is filed according to law. DETAILED DESCRIPTION OF THE INVENTION The present invention is not limited in its scope to the present invention. Any equivalent modifications or variations made by those skilled in the art to the spirit of the present invention are intended to be included in the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS A schematic cross-sectional view of a casing according to an embodiment of the present invention. Description of main components: casing 10 base shell electroless plating layer 12 primer layer powder paint solidified layer 132 liquid paint solidified layer coating layer 14 laser engraving pattern Metal texture layer 17 transparent protective layer 11 13 134 15 Figure 12 19