JP4771135B2 - Printed wiring board, LED device using the same, and printed wiring board manufacturing method - Google Patents
Printed wiring board, LED device using the same, and printed wiring board manufacturing method Download PDFInfo
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- JP4771135B2 JP4771135B2 JP2006004782A JP2006004782A JP4771135B2 JP 4771135 B2 JP4771135 B2 JP 4771135B2 JP 2006004782 A JP2006004782 A JP 2006004782A JP 2006004782 A JP2006004782 A JP 2006004782A JP 4771135 B2 JP4771135 B2 JP 4771135B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 12
- 238000007747 plating Methods 0.000 claims description 133
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 38
- 229910052709 silver Inorganic materials 0.000 claims description 38
- 239000004332 silver Substances 0.000 claims description 38
- 239000004020 conductor Substances 0.000 claims description 36
- 229910052751 metal Inorganic materials 0.000 claims description 35
- 239000002184 metal Substances 0.000 claims description 35
- 229910052737 gold Inorganic materials 0.000 claims description 34
- 239000010931 gold Substances 0.000 claims description 34
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 33
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 24
- RYZCLUQMCYZBJQ-UHFFFAOYSA-H lead(2+);dicarbonate;dihydroxide Chemical compound [OH-].[OH-].[Pb+2].[Pb+2].[Pb+2].[O-]C([O-])=O.[O-]C([O-])=O RYZCLUQMCYZBJQ-UHFFFAOYSA-H 0.000 description 22
- 229910001361 White metal Inorganic materials 0.000 description 17
- 239000010969 white metal Substances 0.000 description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 230000000873 masking effect Effects 0.000 description 10
- 239000000758 substrate Substances 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 239000002585 base Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 3
- 238000009713 electroplating Methods 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000007772 electroless plating Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 208000001490 Dengue Diseases 0.000 description 1
- 206010012310 Dengue fever Diseases 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 208000025729 dengue disease Diseases 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 150000002343 gold Chemical class 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
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- MHOVAHRLVXNVSD-UHFFFAOYSA-N rhodium atom Chemical compound [Rh] MHOVAHRLVXNVSD-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
- H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
-
- 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
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/151—Die mounting substrate
- H01L2924/1515—Shape
- H01L2924/15153—Shape the die mounting substrate comprising a recess for hosting the device
Landscapes
- Fastening Of Light Sources Or Lamp Holders (AREA)
- Parts Printed On Printed Circuit Boards (AREA)
- Manufacturing Of Printed Wiring (AREA)
- Led Device Packages (AREA)
Description
本発明は、銀白色系の金属のめっきからなる反射領域とワイヤボンデング接続用パッドの金めっき端子部とを備えたプリント配線板、それを使用したＬＥＤ装置及びプリント配線板の製造方法に関する。
The present invention relates to a printed wiring board including a reflective region made of silver-white metal plating and a gold-plated terminal portion of a wire bonding connection pad, an LED device using the printed wiring board , and a printed wiring board manufacturing method .
プリント配線板に、銀白色系の金属である銀めっきやニッケルめっき部分を発光素子からの光を反射させる反射領域とし、発光素子（ＬＥＤ）をワイヤボンデング接続用パッドの金めっき端子部にボンデングワイヤで電気的に接続することによりＬＥＤ装置とする要求が多くなっていた。 On the printed wiring board, the silver-plated or nickel-plated portion, which is a silver-white metal, is used as a reflective region that reflects light from the light-emitting element, and the light-emitting element (LED) is bonded to the gold-plated terminal portion of the wire bonding connection pad. There has been an increasing demand for LED devices by electrical connection with dengue wires.
つまり、発光素子からの白色系の光を反射させる反射領域の金属めっきを銅めっきや金めっきとすると赤色系の反射光となり白色や青色等の場合は光反射効率が低くなり反射領域の金属めっきを銀白色系の金属めっきとするものである。 In other words, if the metal plating in the reflective area that reflects white light from the light emitting element is copper plating or gold plating, it will be red reflected light, and in the case of white or blue, the light reflection efficiency will be low and metal plating in the reflective area. Is silver-white metal plating.
発光素子（ＬＥＤ）の小型化、高精細化の要求からワイヤボンデング接続用の金めっき端子部とリフレクタとして利用する反射領域の銀白色系の金属めっきを２ｍｍ以内の領域内で近接して配置することは、従来のめっきレジストやマスキングフィルム（マスキングシート）によるマスキング工程では、めっきレジストとの密着性や位置精度が低下するという問題があった。 Due to demands for miniaturization and high definition of light emitting elements (LEDs), gold-plated terminals for wire bonding connections and silver-white metal plating in the reflective area used as a reflector are placed close to each other within an area of 2 mm or less. In the masking process using a conventional plating resist or masking film (masking sheet), there is a problem that the adhesion to the plating resist and the positional accuracy are lowered.
また、特開２００３−０３１９１４号公報では、銀白色系の金属めっき部分と金めっき部分とを同一表面に備えたプリント配線板において、銀白色系の金属めっき部分が金めっきの表面の一部に積層され、銀白色系の金属めっき部分として、ニッケル、ロジウム、コバルト、クロムの単独、またはこれらの金属の合金を備えたプリント配線板に関するものが開示されている。
本発明の目的とするところは、信頼性のあるワイヤボンデング用の金めっき端子部と、銀白色系の金属めっき部分の発光素子からの光を反射させる反射領域とを形成するプリント配線板、それを使用したＬＥＤ装置及びプリント配線板の製造方法を提供することにある。
The object of the present invention is to provide a printed wiring board that forms a gold-plated terminal portion for reliable wire bonding and a reflective region that reflects light from a light-emitting element of a silver-white metal-plated portion , It is providing the manufacturing method of the LED device and printed wiring board which use it.
発光素子（ＬＥＤ）の小型化、高精細化の要求からワイヤボンデング接続用の金めっき端子部と反射領域に配置する銀めっきとを、２ｍｍ以内の領域内で近接して配置することは、めっきレジストやマスキングフィルム（マスキングシート）によるマスキング法では困難であり、さらに、反射領域の銀めっきがプリント配線板の回路導体として電気的に接続されるとシルバーマイグレーション現象が生じ、絶縁劣化や品質信頼性が低下するという問題があった。 Because of the demand for miniaturization and high definition of light emitting elements (LEDs), the gold plating terminal part for wire bonding connection and the silver plating arranged in the reflection area are arranged close to each other within an area of 2 mm, Masking with plating resist or masking film (masking sheet) is difficult, and when silver plating in the reflective area is electrically connected as a circuit conductor of a printed wiring board, silver migration occurs, resulting in insulation deterioration and quality reliability. There was a problem that the performance decreased.
上記の課題を解決するために、本発明の請求項１は、光を反射させる銀白色系の金属めっきからなる反射領域と、前記反射領域の周囲に近接する金めっき端子部と、前記反射領域及び金めっき端子部に共通のめっきリード端子部と、前記反射領域及び金めっき端子部から前記共通のめっきリード端子部へのめっきリード線と、前記金めっき端子部から前記めっきリード端子部へのめっきリード線の途中に設けられたリード線カット部と、を備えたプリント配線板であって、前記反射領域の銀白色系の金属めっきは金めっきの表面に形成されているプリント配線板を提供するものである。また、本発明の請求項１は、光を反射させる銀白色系の金属めっき、特に銀めっきからなる反射領域は、プリント配線板の回路導体と電気的に接続されない、発光素子を電気的に接続する金めっき端子部から独立した領域に反射領域を設けるプリント配線板を提供するものである。つまり、銀めっきからなる反射領域をプリント配線板の電気的な回路導体として使用しないものである。
In order to solve the above-described problems, the present invention provides a reflective region made of silver-white metal plating that reflects light, a gold-plated terminal portion adjacent to the periphery of the reflective region, and the reflective region. And a plating lead terminal portion common to the gold plating terminal portion, a plating lead wire from the reflective region and the gold plating terminal portion to the common plating lead terminal portion, and from the gold plating terminal portion to the plating lead terminal portion. A printed wiring board having a lead wire cut portion provided in the middle of the plating lead wire , wherein the silver-white metal plating in the reflective region is formed on the surface of the gold plating. To do. Further, according to claim 1 of the present invention, a silver white metal plating that reflects light, in particular, a reflection region made of silver plating is not electrically connected to a circuit conductor of a printed wiring board, and a light emitting element is electrically connected. The printed wiring board which provides a reflective area | region in the area | region independent from the gold plating terminal part to perform is provided. That is, the reflective region made of silver plating is not used as an electric circuit conductor of the printed wiring board.
本発明の請求項２は、金めっきの表面に形成される反射領域の金属めっきが銀めっきであり、前記反射領域の銀めっき専用の金属めっきリード線を備えているプリント配線板を提供するものである。 According to a second aspect of the present invention, there is provided a printed wiring board provided with a metal plating lead wire dedicated to silver plating in the reflection region, wherein the metal plating in the reflection region formed on the surface of the gold plating is silver plating. It is.
本発明の請求項３は、請求項１のプリント配線板において、前記反射領域が、発光素子をボンデングワイヤで電気的に接続する反射領域の周囲に近接する金めっき端子部より、低い位置の凹部に独立して形成されているプリント配線板を提供するものである。 According to a third aspect of the present invention, in the printed wiring board according to the first aspect, the reflective region is located lower than a gold-plated terminal portion adjacent to the periphery of the reflective region in which the light emitting element is electrically connected by a bonding wire. The present invention provides a printed wiring board that is independently formed in a recess.
本発明の請求項４は、プリント配線板の光を反射させる銀白色系の金属めっきを備える反射領域に発光素子を搭載し、この発光素子とプリント配線板の前記反射領域の周囲に近接する金めっき端子部とをボンデングワイヤで電気的に接続するＬＥＤ装置を提供するものである。Claim 4 of this invention mounts a light emitting element in the reflective area | region provided with the silver white type metal plating which reflects the light of a printed wiring board, This gold | metal | money and the gold | metal | money adjacent to the circumference | surroundings of the said reflective area | region of a printed wiring board Provided is an LED device that is electrically connected to a plating terminal portion by a bonding wire.
本発明の請求項５は、共通のめっきリード端子部に接続された、反射領域の金属導体部と回路導体である接続端子部とこれらの両方のめっきリード線と、を形成する工程と、前記反射領域の金属導体部と回路導体である接続用端子部とに金めっきを施す工程と、前記回路接続用端子部のめっきリードを、前記めっきリード線の途中に設けられたリードカット部で切断する工程と、前記回路導体である接続用端子部にマスキングを施すことなく、前記反射領域の金属導体部の金めっき表面のみに銀白色系の金属めっきを、電気めっき、無電解めっきまたは置換めっきにより形成する工程と、を有するプリント配線板の製造方法を提供するものである。
以上、説明したように本発明のプリント配線板、それを使用したＬＥＤ装置及びプリント配線板の製造方法は、反射領域の銀めっき形成において、ワイヤボンデング接続用パッド部分は、めっきレジストによるマスキング法を適用しないので、めっきレジストの剥離除去が不要となり下地金属との密着性は良好で、信頼性のある反射領域の銀めっきがプリント配線板の回路導体として電気的に接続されない発光素子からの光を反射させる銀白色系の銀めっきからなる反射領域を設定できる。
Above, the printed wiring board of the present invention, as described, LED device and a manufacturing method of the printed wiring board using the same, in the silver plating formed in the reflection area, Wa Iyabondengu connection pad portion, the masking method by the plating resist Since it is not applied, it is not necessary to remove the plating resist, and the adhesion with the base metal is good, and the light from the light emitting element that is not electrically connected as the circuit conductor of the printed wiring board with the reliable silver plating in the reflective area A reflective region made of silver-white silver plating to be reflected can be set.
また、発光素子（ＬＥＤ）の小型化、高精細化にともなうワイヤボンデング接続用の金めっき端子部と発光素子の光を反射させる反射領域に配置する銀めっきとを、２ｍｍ以内の領域内で近接して配置しても、反射領域の銀めっきは電気的な回路導体として使用しないものであるからシルバーマイグレーション現象が発生せず、信頼性の高いプリント配線板、それを使用したＬＥＤ装置及びプリント配線板の製造方法を提供するものである。
Moreover, the gold plating terminal part for wire bonding connection accompanying the miniaturization and high definition of the light emitting element (LED) and the silver plating arranged in the reflection area for reflecting the light of the light emitting element are within an area of 2 mm or less. Even if placed in close proximity, the silver plating in the reflective area is not used as an electrical circuit conductor, so no silver migration phenomenon occurs, and a highly reliable printed wiring board , an LED device using the same, and a print A method for manufacturing a wiring board is provided.
まず、図５に基づいて本発明の製造工程の一例を説明する。
大盤のプリント配線板に個別の配線板を配置しワークサイズとする。
本例では、２色めっき基板をマスキングレスで形成する製造工程の一例を説明する。ワークサイズに断裁し、スルーホール穴をＮＣ穴明け、スリット部のルーター加工、銅張り積層板の銅箔表面の平面研磨、銅めっき、エッチングによる回路形成、めっきレジスト形成、金めっき、めっきリード線カット、銀めっき、外形加工をして、マスキングレスで金・銀の２色めっき基板を形成する。
First, an example of the manufacturing process of the present invention will be described based on FIG.
Individual wiring boards are placed on the large printed wiring board to make the workpiece size.
In this example, an example of a manufacturing process for forming a two-color plated substrate without masking will be described. Cut to work size, drill through holes with NC holes, router processing of slits, planar polishing of copper foil surface of copper-clad laminate, copper plating, circuit formation by etching, plating resist formation, gold plating, plating lead wire Cut, silver plating, and external processing to form a gold / silver two-color plating substrate without masking.
以下、本発明の実施の形態を図１の大盤のプリント配線板断面図に基づいて説明する。
２１は大盤のプリント配線板であり、紙フェノール材、ガラスエポキシ材、コンポジット材、ポリイミドフィルムまたはセラミック等の材質によりなる。
７は、個別の配線板であり、個別の配線板７に接続されているそれぞれのめっきリード線９はワークサイズである大盤のプリント配線板２１の周辺部のめっきリード端子部１９に接続している。
（Ａ）は、めっきリード線カット前の大盤のプリント配線板２１の裏側にめっきリード端子部１９のスルーホールめっきで接続された反射領域の金属めっきと、大盤のプリント配線板２１の表側にある金めっき端子部の金属めっきとの両方のめっきリード線となるものである。
（Ｂ）は、大盤のプリント配線板２１の表側にあるめっきリード線カット部１７をドリルでカットし大盤のプリント配線板２１の裏側にある反射領域の金属めっきのみに使用するめっきリード端子部１９である。
Hereinafter, an embodiment of the present invention will be described based on a cross-sectional view of a large printed wiring board in FIG.
A large printed
(A) is on the back side of the printed
(B) is a plating
次に、本発明の製造方法の詳細を図２に基づいて説明する。
（Ａ）は、個別のプリント配線板７に形成しためっきリード端子部１９に接続されている反射領域１３の銀白色系の金属めっき層４と、個別のプリント配線板７の金めっき端子部５の金属めっきとの両方のめっきリード線９となるものである。（金めっきリード線カット前）
本工程は、反射領域１３の金属導体部１８と回路導体である接続用端子部６とに金めっきを施すものである。
Next, details of the manufacturing method of the present invention will be described with reference to FIG.
(A) shows the silver-white metal plating layer 4 in the
In this step, the
（Ｂ）は、個別のプリント配線板７に形成しためっきリード線カット部１７をドリルでカットし、反射領域１３の導体のみに銀白色系の金属めっき層４を形成する。
銀白色系の金属めっき層を銀めっきとし、ここで使用する銀めっきは電気めっきのほか、微細回路で電気めっき用のリード線を引き出す余裕がない場合などには無電解めっきや置換めっきも用いられる。
つまり、銀めっき液（銀が溶けた溶液）に金めっき（金地金）材料を浸漬してもイオン化傾向（イオン化列：Ｎｉ＞銅＞銀＞金）により、金が銀めっき液に溶出することはないから金めっき端子部５をマスキングする必要がない。（マスキングレス）
従って、金めっき上に銀めっきを施すには、反射領域１３の銀めっき用のリード線９に接続されている金属導体部１８にのみ銀めっきが析出する。
(B) cuts the plating lead wire cut
The silver-white metal plating layer is silver plating. The silver plating used here is electroplating, and electroless plating or displacement plating is also used when there is no room to draw out the lead wire for electroplating in a fine circuit. It is done.
In other words, even if a gold plating (gold metal) material is immersed in a silver plating solution (solution in which silver is dissolved), gold is eluted into the silver plating solution due to an ionization tendency (ionization sequence: Ni>copper>silver> gold). Therefore, it is not necessary to mask the gold-plated
Therefore, in order to perform silver plating on the gold plating, the silver plating is deposited only on the
また、イオン化傾向によると銀めっき液（銀が溶けた溶液）に銅材料（銅張り積層板＋銅めっき処理）を浸漬して銀めっきを銅めっき上に直接施すこともっできる。
ただし、シルバーマイグレーション現象を考慮すると、電気回路導体として使用しない反射領域１３の金属導体部１８に限定することが望ましい。
特に、銀めっきの下地が電気化学的に貴な電位の金である本発明は下地が銅などのような電気化学的に卑な電位の金属と比べて腐食が起こりにくい。
また、銀白色系の金属めっきのめっき浴が強酸または強アルカリであっても、下地が金であるために、下地のとけ込みの心配がない。
Moreover, according to the ionization tendency, a silver plating can be directly applied on the copper plating by immersing a copper material (copper-clad laminate + copper plating treatment) in a silver plating solution (solution in which silver is dissolved).
However, in consideration of the silver migration phenomenon, it is desirable to limit the
In particular, in the present invention in which the base of silver plating is gold having an electrochemically noble potential, the base is less likely to corrode than a metal having an electrochemically base potential such as copper.
Further, even if the silver-white metal plating bath is a strong acid or a strong alkali, since the base is gold, there is no risk of the base being melted.
図３の本発明に係るプリント配線板の断面図に基づいて説明する。
同図（Ａ）は通常の両面プリント配線板の断面図であり、絶縁基板１の反射領域１３の金属導体部１８と、発光素子を電気的に接続するための回路導体である接続用端子部６とを同一平面に形成するものである。
上記接続用端子部６は金めっき端子部５とし、前記反射領域１３の金属導体部１８のみに銀白色系の金属めっき層４を形成する。
A description will be given based on the cross-sectional view of the printed wiring board according to the present invention in FIG.
FIG. 2A is a cross-sectional view of a normal double-sided printed wiring board, and a connection terminal portion that is a circuit conductor for electrically connecting the
The connecting
同図（Ｂ）において、凹設穴１１を要する絶縁基板１の表面または裏面には銅箔２が積層され回路導体である配線パターン等を形成している。
つまり、前記反射領域１３が、発光素子をボンデングワイヤで電気的に接続する反射領域の周囲に近接する接続用端子部６（金めっき端子部）より、低い位置の凹部に独立して形成されている。
次に、凹設穴１１の底面や壁面に銀白色系の金属めっき層４として銀めっき層を設け、反射領域１３とする。
また、この凹設穴１１の底面の金属導体部１８はプリント配線板の裏面の金属導体部１８と接合され放熱片として放熱効果が高められる。
In FIG. 2B, a copper foil 2 is laminated on the front or back surface of the insulating substrate 1 that requires the recessed holes 11 to form a wiring pattern or the like as a circuit conductor.
That is, the
Next, a silver plating layer is provided as the silver-white metal plating layer 4 on the bottom surface or wall surface of the recessed hole 11 to form the
Further, the
図４は本発明に係るプリント配線板に発光素子（ＬＥＤ）を組み込んだ断面図である。
同図（Ａ）は、プリント配線板の平坦の絶縁基板１の反射領域１３の金属導体部１８に銀白色系の金属めっき層４を形成した上に発光素子１０を搭載し、ボンデングワイヤ１２で発光素子１０と反射領域の周囲に近接する接続用端子部６とをワイヤボンデング接続する。また、このプリント配線板の端面に側面端子８を形成する。
FIG. 4 is a cross-sectional view in which a light emitting element (LED) is incorporated in a printed wiring board according to the present invention.
In FIG. 2A, a light-emitting
同図（Ｂ）は、絶縁基板１に凹設穴１１を設け反射効率が良く、反射領域の周囲に近接する接続用端子部６より、低い位置の凹部に独立して形成されているＬＥＤ装置を提供するものである。
１０は発光素子（ＬＥＤ）であり、絶縁基板１の凹設穴１１に実装されている。凹設穴１１には表面に銀白色系の金属めっき層４として銀めっき層を設け、指向性のある光反射機能を有している。１２はボンデングワイヤであり、ワイヤボンデング接続用接続用端子部６と前記発光素子１０とをボンデング接続している。 また、このプリント配線板の端面にも側面端子８を形成する。
FIG. 2B shows an LED device in which a recessed hole 11 is provided in the insulating substrate 1 to improve reflection efficiency, and is independently formed in a recessed portion at a lower position than the
A light emitting element (LED) 10 is mounted in the recessed hole 11 of the insulating substrate 1. The concave hole 11 is provided with a silver plating layer as a silver-white metal plating layer 4 on the surface, and has a directional light reflection function.
１…絶縁基板、２…銅箔、３…回路導体、４…銀白色系の金属めっき層、
５…金めっき端子部、６…接続用端子部、７…個別の配線板、８…側面端子、
９…めっきリード線、１０…発光素子、１１…凹設穴、１２…ボンデングワイヤ、１３…反射領域、１７…リード線カット部、１８…金属導体部、１９…めっきリード端子部。
DESCRIPTION OF SYMBOLS 1 ... Insulation board | substrate, 2 ... Copper foil, 3 ... Circuit conductor, 4 ... Silver white type metal plating layer,
5 ... Gold-plated terminal part, 6 ... Connection terminal part, 7 ... Individual wiring board, 8 ... Side terminal,
DESCRIPTION OF SYMBOLS 9 ... Plating lead wire, 10 ... Light emitting element, 11 ... Recessed hole, 12 ... Bonding wire, 13 ... Reflection area | region, 17 ... Lead wire cut part, 18 ... Metal conductor part, 19 ... Plating lead terminal part
Claims (5)
前記反射領域の金属導体部と回路導体である接続用端子部とに金めっきを施す工程と、
前記めっきリード端子部と前記回路導体である接続端子部とを接続するめっきリード線を、前記めっきリード線の途中に設けられたリードカット部で切断する工程と、
前記金めっきを施した、反射領域の金属導体部と回路導体である接続用端子部の両者を銀めっき液に漬浸して、前記反射領域の金属導体部の金めっき表面のみに銀めっきを電気めっきにより形成するする工程とを有し、
前記反射領域の銀めっきは金めっきの表面に形成されており、かつ前記反射領域は前記金めっき端子部と電気的に接続されていないプリント配線板を形成するプリント配線板の製造方法。 The metal conductor part of the reflection region, the connection terminal part which is a circuit conductor, the plating lead terminal part common to the metal conductor part and the connection terminal part, and both the metal conductor part and the connection terminal part to the common plating lead Forming a plating lead wire connected to the terminal portion;
Applying gold plating to the metal conductor part of the reflection region and the connection terminal part which is a circuit conductor;
Cutting the plating lead wire connecting the plating lead terminal portion and the connection terminal portion which is the circuit conductor at a lead cut portion provided in the middle of the plating lead wire ;
The gold-plated metallic conductor part in the reflective region and the connection terminal part that is a circuit conductor are both immersed in a silver plating solution, and silver plating is applied only to the gold-plated surface of the metallic conductor part in the reflective region. A step of forming by plating,
The method of manufacturing a printed wiring board, wherein the silver plating of the reflection area is formed on a gold plating surface, and the reflection area forms a printed wiring board that is not electrically connected to the gold plating terminal portion.
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