TWI351903B - A circuit board structure with concave conductive - Google Patents

A circuit board structure with concave conductive Download PDF

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Publication number
TWI351903B
TWI351903B TW096127050A TW96127050A TWI351903B TW I351903 B TWI351903 B TW I351903B TW 096127050 A TW096127050 A TW 096127050A TW 96127050 A TW96127050 A TW 96127050A TW I351903 B TWI351903 B TW I351903B
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TW
Taiwan
Prior art keywords
conductive
layer
circuit board
insulating layer
board structure
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Application number
TW096127050A
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English (en)
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TW200906256A (en
Inventor
Shao Chien Lee
Chih Ming Chang
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Unimicron Technology Corp
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Application filed by Unimicron Technology Corp filed Critical Unimicron Technology Corp
Priority to TW096127050A priority Critical patent/TWI351903B/zh
Priority to US11/870,182 priority patent/US20090025210A1/en
Publication of TW200906256A publication Critical patent/TW200906256A/zh
Priority to US12/652,226 priority patent/US8590147B2/en
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Publication of TWI351903B publication Critical patent/TWI351903B/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
    • H01L21/4814—Conductive parts
    • H01L21/4846—Leads on or in insulating or insulated substrates, e.g. metallisation
    • H01L21/4853—Connection or disconnection of other leads to or from a metallisation, e.g. pins, wires, bumps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/08—Manufacture of mounts or stems
    • H01K3/10—Machines therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
    • H01L21/4814—Conductive parts
    • H01L21/4846—Leads on or in insulating or insulated substrates, e.g. metallisation
    • H01L21/486—Via connections through the substrate with or without pins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
    • H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
    • H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
    • H01L23/49811—Additional leads joined to the metallisation on the insulating substrate, e.g. pins, bumps, wires, flat leads
    • H01L23/49816—Spherical bumps on the substrate for external connection, e.g. ball grid arrays [BGA]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
    • H01L23/538—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames the interconnection structure between a plurality of semiconductor chips being formed on, or in, insulating substrates
    • H01L23/5384—Conductive vias through the substrate with or without pins, e.g. buried coaxial conductors
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H05K1/111—Pads for surface mounting, e.g. lay-out
    • H05K1/112—Pads for surface mounting, e.g. lay-out directly combined with via connections
    • H05K1/113—Via provided in pad; Pad over filled via
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/03—Conductive materials
    • H05K2201/0332—Structure of the conductor
    • H05K2201/0388—Other aspects of conductors
    • H05K2201/0394—Conductor crossing over a hole in the substrate or a gap between two separate substrate parts
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09372—Pads and lands
    • H05K2201/09472—Recessed pad for surface mounting; Recessed electrode of component
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09818—Shape or layout details not covered by a single group of H05K2201/09009 - H05K2201/09809
    • H05K2201/09827—Tapered, e.g. tapered hole, via or groove
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/07—Treatments involving liquids, e.g. plating, rinsing
    • H05K2203/0703—Plating
    • H05K2203/0733—Method for plating stud vias, i.e. massive vias formed by plating the bottom of a hole without plating on the walls
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
    • H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
    • H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
    • H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
    • H05K3/3457—Solder materials or compositions; Methods of application thereof
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
    • H05K3/42—Plated through-holes or plated via connections
    • H05K3/423—Plated through-holes or plated via connections characterised by electroplating method
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/46—Manufacturing multilayer circuits
    • H05K3/4644—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits
    • H05K3/4647—Manufacturing multilayer circuits by building the multilayer layer by layer, i.e. build-up multilayer circuits by applying an insulating layer around previously made via studs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49126—Assembling bases
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49128—Assembling formed circuit to base
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49155—Manufacturing circuit on or in base
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49155—Manufacturing circuit on or in base
    • Y10T29/49165—Manufacturing circuit on or in base by forming conductive walled aperture in base

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
  • Manufacturing Of Printed Wiring (AREA)

Description

1351903 0701001 23348tw£doc/p 九、發明說明： 、 【發明所屬之技術領域】 . 本發明是有關於—種電路板結構及其製造方法，且特 ·: 別是有關於一種内凹式導電柱之電路板結構及其製造方 ; 法。 【先前技術】 • 一般而言，習知用以承載及電性連接多個電子元件的 電路板主要是由多個圖案化導電層（patterned c〇nductive layers )以及多個絕緣層（dieiectric iayers )交替疊合所構 成。其中，這些圖案化導電層是由銅箔層（c〇pperf〇il)直 接紅過圖案化製私，或由銅落層經電鍍製程增加導電層厚 度再經過圖案化製程所定義形成。這些絕緣層是分別配置 . 於相鄰這些圖案化導電層之間，用以隔離這些圖案化導電 層。此外，這些相互重疊之圖案化導電層之間是透過導電 孔道（conductive via)而彼此電性連接。另外，電路板之 • 表面上還可配置各種電子元件（例如主動元件或被動元 件）’並藉由電路板内部線路來達到電性訊號傳遞 · ’ （ electrical signal propagation )之目的。 .-· 圖1為習知之一種電路板的剖面示意圖。請參考圖1， 習知電路板100之圖案化導電層120配置於絕緣層11〇 上’且圖案化導電層120具有多個接墊（pad ) 122。圖案 化焊罩層（patterned solder mask layer) 130配置於絕緣層 110上以覆盍部分圖案化導電層120。圖案化焊罩層i3〇 5 1351903 0701001 23348twf.doc/p 具有多個開口 132 ’以分別暴露出這些接墊122。此外，這 些焊球（solder ball) 140分別配置於這些接墊122上且分 別電性連接至這些接墊122。 然而，在習知電路板1〇〇的製作過程中，在形成圖案 化焊罩層130時，這些開口 132的位置可能無法分別精確 對準這些接塾122而產生偏移’使得部分這些接墊122(可 參考圖1右邊的接墊122)被圖案化焊罩層13〇所覆蓋的 • 範圍過大。此外，在影像轉移時，亦有可能受到露光、曝 光不足、顯影能力不足或顯影不全等原因造成開口 132過 小。因此，當這些焊球140分別形成於這些接墊122上時， 部分這些焊球140(可參考圖1右邊的焊球14〇)與對應的 接墊122之間的接合面積變小，進而降低部分這些焊球14〇 與對應的接墊122之間的接合可靠度。 【發明内容】 本發明提供一種内凹式導電柱之電路板結構及其製 ^方法’肋製仙凹式導電柱之電路板，以讓焊接材料 與導電柱的接合度更佳。 '、本發明提出一種製作内凹式導電柱之電路板結構的 $法，其包括：首先，提供—導電層；形成多個導電柱於 V電層之一表面；形成一絕緣層於形成導電柱之導電層表 上，々這些‘電柱之頂端顯露於絕緣層相對遠離導電層 表面；以及去除這料電_露之頂端，以使這些^ 電柱之高度相對低於絕緣層高度而内凹於絕緣層中。 1351903. 0701001 23348twf.doc/p 在本發明之-實施例中，形成這些導電柱的步驟包枯 圖案化钱刻（etching)導電層。 在本發明之-實施例中，形成絕緣層的步帮包括壓合 (lammate)或印刷一介電材料於形成導電柱之導電層表面 上。 曰 在本發明之-實施例中，去除這些導電柱顯露之頂端 的方法包括蝕刻。 /在本發明之-實施射，在絲這些導妹顯露之頂 端後，更包括配置一銲接材料至内凹於絕緣層中之這些導 電柱上而外凸於絕緣層。 一 本發明更提itj-種製作_式導妹之電路板結構 的方法’包括：首先，提供—導電層；形成—絕緣層於導 電層之一表面上；於絕緣層中形成多個孔道，其中這些孔 道顯露出導電層之表面；填人—導電材料於這些孔道中， 以形成多個導電柱於導電層之表面上，使得這些導電柱之 頂端顯露於絕緣層相對遠料電層表面；以及 =之頂端’以使這些導電柱之高度相對低於絕 緣層间度而内凹於絕緣層中。 0 =明之一實施例中，形成绝緣層的步驟包括壓合 或印刷，丨電材料於導電層之表面。 在，發明之—實施例中，形成這些孔道的方法包括兩 射鑽孔（laser drilling)。 田 明之—實施例中，填人導電材料於這些孔道中 的方/匕括電鍍（electr〇plating)、網印導電膠或導電高 7 1351903 0701001 23348twf.doc/p 分子材料。 在本發明之一實施例中，導曹 在本發明之—實施例中，去除二=膠或，。 的方法包括研磨或制。 -I柱顯露之頂端 後，施例中’去除這些導電柱顯露之頂端 枉上而外凸於絕緣層。 狀、、錢層中之這些導電
-導種内凹式導電柱之電路板結構，包括 形成於導電層之-表面，且盘導緣層° _導電柱 緣層覆蓋於導電層之表面，其中；頂圖案化絕 緣層相對遠離導電層之一表二這S ;度相對低於圖案化絕緣層高度而内凹於圖案化絕緣層 形成
本發明由於將絕緣層形成於導電層之外層，可 ^層,用’所以可避免習知中防焊層需要對位接塾而造 防珲開口偏移’或者是f彡像轉移時所造成之防焊開口過 、的問題。此外’由於導電柱内凹於絕緣層中’使得焊接 材料能填入絕緣層而與導電柱有效地接合，而可讓焊接材 料與導電柱的接合可靠度提升，也不需額外配置接墊。 為讓本發明之上述特徵和優點能更明顯易懂，下文特 舉較佳實施例，並配合所附圖式，作詳細說明如下。 1351903 0701001 23348twf.doc/p 【實施方式】 [第一實施例] 圖2A〜圖2F為本發明第一實施例之製作内凹式導電 柱之電$板結構的流程示意圖。請參考圖2A，首先提供一 ^電層叫。’此導電層21。例如為一金屬層，其材質；^ 著’請參考圖2B，對導電層⑽進行圖案化侧， 以讓¥電層的表面212形成多個導電柱22〇。在另合 财，導紐22G亦可以銲線齡接打成凸塊^ 八他適▲的方式形成於導電層21〇的表面212。 的^參考圖2C ’在導電層210形成導電柱220 21〇、上成—絕緣層23G。形成絕緣層23G於導電居 :者2 —介電材料與導電層剔彼此壓合： m印刷介，料的方式將絕緣層23〇
後’請參考圖2D，令這些導電柱220之頂端J 如在介電材料未固㈣之-表咖 這些導電柱220之頂端Hi，與介電材料壓合直到 介電材料！!)化之後再 ^於介電材料為止，亦T在 ^-Tf ^ 299 as ^ 磨的製程來讓這些導電柱 之頂端J22顯露於介電材料為止。 22° 接者’清參考圖2E，可盐山 柱⑽的頂端222,使得導=由餘刻等方法移除這些導電 緣層230的高度h2。此外的兩度hi相對低於绝 的製程進行時，可同 在本貫施例中，侧導電柱220 形成圖案化導電層2l〇a 1層=進行圖案化钕刻，从 而减少製程的步驟。然後，靖袁 9 1351903 0701001 23348twf.doc/p 考圖2F，在本實施例中，進行完移除導電柱22〇的頂端 222後，還可藉由電鍍或印刷等方式配置一焊接材料於内 凹於絕緣層230中之這些導電桎220上，以形成一銲接材 料層240。 也就是說，在經過前述的製作方法後，能夠製作出_ 内凹式導電柱之電路板結構2〇〇。更進一步來說，内凹式 導電柱之電路板結構200包括—導電層21〇 (圖案化導電 • 層210a)、多個導電柱22〇以及一圖案化絕緣層^30。 如圖2E所示，這些導電柱22〇形成於導電層21〇之 表面212’且與導電層210電性連接。圖案化絕緣層23〇 覆蓋於表面212 ’其中這些導電柱22〇之頂端222顯露於 圖案化絕緣層230相對遠離導電層21〇之一表面232 ,且 迫些導電柱220之高度相對低於圖案化絕緣層23〇而内凹 於圖案化絕緣層230中。此外，在圖2F中，内凹式導電 柱之電路板結構200更包括一銲接材料層24〇，其形成於 廷些導電柱220上而外凸於圖案化絕緣層23〇。另外，導 屯層210可與導電柱220的材質相同，其材質包括銅、鋁 或其合金。 在此必須說明的是，内凹式導電柱之電路板結構2〇〇 "T應用於不同形式的晶片封裝結構，其外型可依照設計者 的需求而有所改變。此外，内凹式導電柱之電路板結構2〇〇 還可包括彼此交疊配置之多個導電層22〇與多個圖案化絕 緣層230。因此，本實施例只是用以舉例而非限定本發明。 另外，内凹式導電柱之電路板結構2〇〇亦不限於由本實施 1351903 0701001 23348twf doc/p 例之製作方法製作。 [第二實施例] 圖3A〜圖3F為本發明第二實施例之製作内四式導電 柱之電路板結構的流程示意圖。本實施例與前一實施例相 類似，唯其不同處在於：前一實施例在形成導電枉220之 後，再形成絕緣層230 ;本實施例則是在形成絕緣層320
之後，再形成導電柱33〇。詳細流程請參照以下説明，其 相似處將不再贅述。 請參考圖3A，首先形成一導電層31〇，其具有至少〜 表面312。接著，請參考圖，藉由壓合或印刷等方式在 導電層310形成導電柱330的表面312形成一絕緣層320。 ，來’請參考圖3C，對絕緣層32〇進行雷射鑽孔或是微影 等方式’以在絕緣層320中形成多個孔道322，而顯露出 導電層310的部分表面312。
然後，睛參考圖3D，例如藉由印刷填塞、電鍍、磯 鍍或氣相f積的方式，將一導電材料填入這些孔道322之 中丄以在導電層31G的表面形成多個導電柱33G，其中這 二=電柱330之頂端會分別自這些孔道322顯露出來。在 本貝施例中，導電材料包括銅、銅#、銀膠或導電高分子 參考圖3E ’例如用㈣的方法去除這些導 m 4 路出來的頂端332，以讓這些導電柱330之高 i 332目時^於絕緣層的高度…在餘刻導電柱330的頂 Ϊ考圖3F /同時形成圖案化導電層通。再接著，請 在這些導電柱330的表面形成—焊接材料層 11 1351903 0701001 23348twf.doc/p 340 〇 附帶-提的是’在另-實施例中，藉由讀等方 入導電材料於孔道322之中時，在絕緣層32〇之表$ ^ (如圖3D所示）亦會電鍍上一層金屬。接下來，、 研磨或蝕刻的方式來讓絕緣層320之表面324顯露出^。 此=，在又一實施例中，將導電材料填入這些孔道^。之 中時，可藉由配置一防鍍層於孔道322之開口 322& (如
3C所示）來控制所形成之導電柱33〇的高度h3 (如圖^ 所示）’使得導電柱330之高度h3相對低於絕緣層的 h4(如圖3E所示），便可省掉去除這些導電柱％ ς 332之步驟。 只和
經由前述的製作之後，可製作出一内凹式導電柱之 路板結構3G0 (請參考圖別，其結構上類似於前一實施 例之内凹式導電柱之電路板結構2〇〇 (請參考圖汙）。簡 單來說，内凹式導電柱之電路板結構3〇〇包括一導電層31〇 (圖案化導電層31Ga)、多個導電柱33〇以及一圖案化絕 緣層320，其中’這些導電柱33〇内凹於圖案化絕緣層伽 中。此外’在圖3F巾’ _式導電柱之電路板結構3〇〇 更可包括一銲接材料層340。 綜上所述，本發明由於將絕緣層形成於導電層之外 層’可取代畴層來確保部分料電層*會_到焊接材 料。因此，可避免習知情焊層需要齡齡而造成防焊 ，口偏移，或者是影像轉料所造成之防㈣口過小的問 題。此外’由於導電㈣·絕緣層巾，使得焊接材料能 12 1351903 0701001 23348twf.doc/p ，入心緣層，使*結構上的競健，α讓焊接材料 電柱有效地接合。因此，焊接材料與導電 提升’也不需額外配置接墊。 减 雖然本發明已以較佳實施例揭露如上，然其並非用以 限定本發明’任何所屬技術領域中具有itf知識者，在 脫離本發明之精神和範_，#可作些許之更動與 因此本發明之賴範圍#視制4請專概圍所 為準。 可
【圖式簡單說明】 圖1為習知之一種電路板的剖面示意圖。 圖2A〜圖2F為本發明第一實施例之製作内凹式 柱之電路板結構的流程示意圖。 电 圖3A〜® 3F 4本發明第二實施例之製作内凹带 柱之電路板結構的流程示意圖。 包
【主要元件符號說明】 1G0 .電路板 U0 :絕緣層 120:圖案化導電層 U2 ’·接墊 130 :圖案化焊罩層 132 :開口 H0 I焊球 13 1351903. 0701001 23348twf.doc/p 200、300 :内凹式導電柱之電路板結構 210 :導電層 210a :圖案化導電層 212、232 :表面 220 :導電柱 222 :頂端 230 :絕緣層 240 :銲接材料層 310 :導電層 310a :圖案化導電層 312 :表面 320 :絕緣層 322 :孔道 322a :開口 324 :表面 330 :導電柱 332 :頂端 340 :焊接材料層 hi、h2、h3、Μ :高度 14

Claims (1)

1351903..
十、申請專利範圍： • 丨·一種製作内凹式導電柱之電路板結構的方法，包括： • 提供一導電層； 形成一絕緣層於該導電層之一表面上； 於該絕緣層中形成多個孔道，其中該些孔道顯露出該 導電層之該表面； 填入一導電材料於該些孔道中，以形成多個導電柱於 5亥導電層之該表面上’使得該些導電柱之頂端顯露於該絕 緣層相對遠離該導電層之一表面；以及 去除該些導電柱顯露之該頂端，以使該些導電 度相對低於該絕緣層而内凹於該絕緣層中。 门 2. 如申請專利範圍第！項所述之製仙凹 電路板結構的方法，其中形成該絕緣層的步驟包括： 壓合或印刷一介電材料於該導電層之該表面。. 3. 如申請專鄉1)第丨項所述之製作㈣ :路板結構的方法，其中形成該些孔道的方法包』射鑽 4·如申請專雜圍第丨項所述之製作 電路板結構的方法，其中填人該導電㈣㈣ i 方法包括印刷填塞、電鍍、濺鏟或氣相沈積的=、 5. 如申請專利範圍第4項所述之製作内凹^雷 電路板結構的方法’其中填人該些孔道中的 粗 銅、銅膠、銀膠或導電高分子材料。 枒料包括 6. 如申請專利範圍第丨項所述之製仙叫導電柱之 15 1351903. f ' 100-3-21 電路板結構的方法’其中填入該些孔道中的導電材料包括 銅、銅膠、銀膠或導電南分子材料。 7. 如申請專利範圍第1項所述之製作内凹式導電柱之 電路板結構的方法，其中去除該些導電柱顯露之該頂端的 方法包括研磨或姓刻。 8. 如申請專利範圍第1項所述之製作無銲墊式電路板 結構的方法，其中在去除該些導電柱顯露之該頂端後，更 包括： 配置一銲接材料至内凹於該絕緣層中之該些導電柱 上而外凸於該絕緣層。 16
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