DE2856368C2 - Process for the surface finishing of printed circuit boards and printed circuit boards manufactured according to such processes - Google Patents
Process for the surface finishing of printed circuit boards and printed circuit boards manufactured according to such processesInfo
- Publication number
- DE2856368C2 DE2856368C2 DE19782856368 DE2856368A DE2856368C2 DE 2856368 C2 DE2856368 C2 DE 2856368C2 DE 19782856368 DE19782856368 DE 19782856368 DE 2856368 A DE2856368 A DE 2856368A DE 2856368 C2 DE2856368 C2 DE 2856368C2
- Authority
- DE
- Germany
- Prior art keywords
- conductor
- conductor surfaces
- printed circuit
- chemical
- circuit boards
- 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.)
- Expired
Links
Classifications
-
- 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
- H05K3/22—Secondary treatment of printed circuits
- H05K3/24—Reinforcing the conductive pattern
- H05K3/244—Finish plating of conductors, especially of copper conductors, e.g. for pads or lands
-
- 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
- H05K2203/02—Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
- H05K2203/025—Abrading, e.g. grinding or sand blasting
-
- 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
- H05K2203/03—Metal processing
- H05K2203/0392—Pretreatment of metal, e.g. before finish plating, etching
-
- 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
- H05K2203/072—Electroless plating, e.g. finish plating or initial plating
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing Of Printed Wiring (AREA)
Description
galvanischem Wege erzeugt werden. Als besonders vorteilhaft für die Herstellung von Oberflächenverede-be generated galvanically. As particularly advantageous for the production of surface finishing
vorteilhaft hat sich eine Mehrlagenbeschichtung erwie- lungen kupferner Leiterflächen, die zunächst mit einerA multilayer coating of copper conductor surfaces that are initially coated with a
sen, bestehend aus einer Zwischen- oder Sperrschicht, Sperrschicht aus Nickel und anschließend mit einersen, consisting of an intermediate or barrier layer, barrier layer made of nickel and then with a
z. B. aus Nickel, und einer Deckschicht z. B. aus Gold. Deckschicht aus Gold zu versehen sind. Währendz. B. made of nickel, and a top layer z. B. made of gold. Top layer of gold are to be provided. While
nach dem Ätzen der Leiterplatten, also nach der galvanischem Wege die Nickelschicht wenigstens eineafter the etching of the printed circuit boards, ie after the galvanic way, the nickel layer at least one
Schichtstärke. Herstellungszeit und Materialaufwand werden daher erheblich verringertLayer thickness. Manufacturing time and material costs are therefore considerably reduced
Bis zum Aufrauhungsprozeß nach dem neuen Verfahren verläuft die Herstellung der Leiterplatten mit der Ausbildung der Leiterflächen in herkömmlicher Weise. Dabei kann der Aufrauhungsprozeß gemäß einer Weiterbildung der Erfindung mit dem nach dem Ätzen der Leiterplatten folgenden Abwasch- und Spülvorgang gekoppelt werden, so daß hierfür kein gesondertes Arbeitsaggregat erforderlich ist ' οUntil the roughening process according to the new process, the production of the circuit boards continues the formation of the conductor surfaces in a conventional manner. The roughening process according to a Further development of the invention with the washing and rinsing process following the etching of the circuit boards be coupled so that no separate working unit is required for this' ο
Das Aufrauhen der zu beschichtenden Leiterflächen erfolgt zweckmäßig und in einfacher Weise durch abrasives Entfernen von Leitermaterial, also durch Hobeln oder Abziehen, um möglichst scharfe Abrißkanten zu erhalten. Dazu kann man beispielsweise is bekannte, mit speziellen Bürsten, z.B. Scotchbrite, ausgerüstete Bürstenautomaten verwenden, die besonders leicht in den vorangehenden Abwasch- und SpülvorgrJig eingegliedert werden können.The roughening of the conductor surfaces to be coated is carried out in an expedient and simple manner abrasive removal of conductor material, i.e. by planing or peeling, in order to achieve the sharpest possible tear-off edges to obtain. For example, you can use is use known automatic brushes equipped with special brushes, e.g. Scotchbrite, which are specially can easily be incorporated into the preceding washing-up and rinsing phases.
Bei der nachfolgenden Behandlung mit den kalkhaltigen Feststoffen erreicht man die beste Wirkung, wenn die Feststoffe durch den Druck eines elastischen Stoffes auf die Leiteroberflächen schleifend einwirken. Das erfordert Feststoffe feinster Körnung, damit durch die Schleifwirkung der Aufrauhungseffekt nicht wieder verloren geht Am besten geeignet sind Schlämmkreide, Wiener Kalk oder feinstes Bimsmehl, die sich in schwachsauer Lösung nicht zersetzen, um die sich nach dem Aufrauhen ausbildenden Oxyde an der Leiteroberfläche zu entfernen und die Oberfläche aktiv zu halten, bis der nachfolgende chemische Beschichtungsprozeß einsetzt Die in Form von Pulver oder Paste zur Verfügung stehenden Feststoffe werden ausreichend mit Wasser versetzt so daß ein die nachfolgenden Metallabscheidung behinderndes Festsetzen auf den Leiterplatten oder in den Bohrlöchern verhindert wird, wobei die schleifende Einwirkung auf die Leiterflächen durch Wischen mit einem Schwamm oder beim Durchziehen der Leiterplatte zwischen zwei Schwämmen erzielt werden kann.In the subsequent treatment with the calcareous solids, the best effect is achieved if the solids have an abrasive effect on the conductor surfaces due to the pressure of an elastic material. That requires finest-grain solids so that the roughening effect does not occur again due to the grinding effect is lost The most suitable are chalk, Viennese lime or the finest pumice flour, which can be found in Do not decompose weakly acidic solution to avoid the oxides that form on the conductor surface after roughening to remove and keep the surface active until the subsequent chemical coating process begins The solids available in the form of powder or paste are sufficient mixed with water so that the subsequent metal deposition hindering sticking to the Printed circuit boards or in the drill holes is prevented, with the abrasive effect on the conductor surfaces by wiping with a sponge or by pulling the circuit board between two sponges can be achieved.
Nach diesem rein mechanischen, aber äußerst wirksamen Vorbereitungsprozeß kann dann die Aufbringung der erforderlichen Metallschichten zur Oberflächenveredelung auf an sich bekanntem Wege erfolgen.After this purely mechanical, but extremely effective preparation process, the application the necessary metal layers for surface finishing in a known way take place.
Insgesamt erhält man auf diese Weise Leiterplatten mit oberflächenveredelten Leiterflächen von hoher Qualität, die infolge Nutzung der Metallbeschichtung auf chemischem Wege einfacher und kostengünstiger als bisher herstellbar sind.Overall, in this way, printed circuit boards with surface-refined conductor areas of high quality are obtained Quality that is easier and cheaper due to the use of the metal coating in a chemical way than can be produced up to now.
Neben dem beschriebenen Verfahren mit seinen Varianten umfaßt die Erfindung auch die nach diesen Verfahren hergestellten Leiterplatten, die dadurch gekennzeichnet sind, daß die Leiterflächen mechanisch in mikroskopisch feiner Verteilung scharfkantig aufgerauht sind und daß auf den aufgerauhten und anschließend mit kalkhaltigen Feststoffen feinster Körnung behandelten Leiterflächen wenigstens eine weitere Metallschicht ohne Überhänge chemisch abgelagert istIn addition to the method described with its variants, the invention also includes those according to these Process manufactured circuit boards, which are characterized in that the conductor surfaces mechanically are roughened sharp-edged in microscopic distribution and that on the roughened and then at least one conductor area treated with calcareous solids of the finest grain another metal layer is chemically deposited without overhangs
Bei derartigen Leiterplatten sind die zur Oberflächenveredelung aufgebrachten Schichten mit den Leiterflächen äußerst fest verbunden. Die Schichten sind porenfreier als galvanisch aufgebrachte Schichten und damit bereits bei geringer Stärke diffusionsfest.In such circuit boards, the layers applied for surface finishing are with the conductor surfaces extremely tightly connected. The layers are free of pores than galvanically applied layers and thus diffusion-proof even at low thicknesses.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782856368 DE2856368C2 (en) | 1978-12-27 | 1978-12-27 | Process for the surface finishing of printed circuit boards and printed circuit boards manufactured according to such processes |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782856368 DE2856368C2 (en) | 1978-12-27 | 1978-12-27 | Process for the surface finishing of printed circuit boards and printed circuit boards manufactured according to such processes |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2856368A1 DE2856368A1 (en) | 1980-07-10 |
DE2856368C2 true DE2856368C2 (en) | 1982-10-14 |
Family
ID=6058512
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19782856368 Expired DE2856368C2 (en) | 1978-12-27 | 1978-12-27 | Process for the surface finishing of printed circuit boards and printed circuit boards manufactured according to such processes |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE2856368C2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3608010A1 (en) * | 1986-03-11 | 1987-09-17 | Philips Patentverwaltung | METHOD FOR PRODUCING AN ELECTRICALLY CONDUCTIVE ADHESIVE CONNECTION |
-
1978
- 1978-12-27 DE DE19782856368 patent/DE2856368C2/en not_active Expired
Non-Patent Citations (1)
Title |
---|
NICHTS-ERMITTELT |
Also Published As
Publication number | Publication date |
---|---|
DE2856368A1 (en) | 1980-07-10 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8110 | Request for examination paragraph 44 | ||
D2 | Grant after examination | ||
8339 | Ceased/non-payment of the annual fee | ||
8363 | Opposition against the patent | ||
8339 | Ceased/non-payment of the annual fee |