DE3810151C2 - - Google Patents
Info
- Publication number
- DE3810151C2 DE3810151C2 DE19883810151 DE3810151A DE3810151C2 DE 3810151 C2 DE3810151 C2 DE 3810151C2 DE 19883810151 DE19883810151 DE 19883810151 DE 3810151 A DE3810151 A DE 3810151A DE 3810151 C2 DE3810151 C2 DE 3810151C2
- Authority
- DE
- Germany
- Prior art keywords
- printing
- stencil
- circuit board
- openings
- landing
- 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 - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K3/00—Tools, devices, or special appurtenances for soldering, e.g. brazing, or unsoldering, not specially adapted for particular methods
- B23K3/06—Solder feeding devices; Solder melting pans
-
- 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
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/12—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns
- H05K3/1216—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern using thick film techniques, e.g. printing techniques to apply the conductive material or similar techniques for applying conductive paste or ink patterns by screen printing or stencil printing
- H05K3/1225—Screens or stencils; Holders therefor
-
- 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
- H05K3/3452—Solder masks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electric Connection Of Electric Components To Printed Circuits (AREA)
- Printing Plates And Materials Therefor (AREA)
Description
Die vorliegende Erfindung geht von einer gemäß dem Oberbegriff des Hauptanspruches konzipierten Druckschablone aus.The present invention is based on one according to the preamble of the main claim designed printing template.
Zum Bedrucken von Leiterplatten mit Lotpaste werden Druckschablonen in vielfältigen Ausführungsformen eingesetzt. Dabei kommt es bei einem solchen Druckverfahren darauf an, den sogenannten, als Anschlußmittel dienenden Landeflächen der Leiterplatten genau definierten Mengen an Lotpasten zuzuordnen, um ein anschließendes einwandfreies Verlöten der aufzubringenden Bauteile mit den auf der Leiterplatte vorhandenen Landeflächen zu gewährleisten.For printing on printed circuit boards with solder paste Printing stencils used in various designs. It is important in such a printing process that so-called landing areas of the Assign PCBs to precisely defined quantities of solder pastes, for a subsequent perfect soldering of the components to be applied with those on the circuit board to ensure existing landing areas.
Durch die US-PS 43 23 593 und die US-PS 35 16 155 sind Druckschablonen bekanntgeworden, bei denen die wesentlichen Merkmale des Oberbegriffs des Hauptanspruches zum Ausdruck kommen. Bei diesen vorbekannten Ausführungsformen sind die Druckschablonen jedoch als ebene Platten ausgebildet. Wegen der bei solchen Drucken notwendigen Genauigkeit bezüglich gleichbleibender, bestimmbarer Schichtdicken können mit solchen Druckschablonen aber nur Leiterplatten zufriedenstellend bedruckt werden, deren zu bedruckende Oberflächen hinreichend plan ausgeführt sind. Sollen Leiterplatten mittels Druckschablonen mit Lotpaste bedruckt werden, auf deren zu bedruckende Oberflächen Erhebungen vorhanden sind, ergeben sich wegen des dann entstehenden Höhenversatzes undefinierte Lotpastenmengen auf den Landeflächen. Ein zuverlässiges, einwandfreies Verlöten der aufzubringenden Bauteile mit den Landeflächen ist somit nicht möglich.By US-PS 43 23 593 and US-PS 35 16 155 are Printing stencils have become known in which the essential Features of the preamble of the main claim expressed come. In these previously known embodiments, the However, printing stencils are designed as flat plates. Because of the accuracy required in such prints constant, determinable layer thicknesses can be achieved with such Printing stencils are only satisfactory for printed circuit boards be printed, the surfaces to be printed sufficient are executed according to plan. Should circuit boards by Printing stencils are printed with solder paste on their printing surface surveys are available undefined due to the resulting height offset Amounts of solder paste on the landing areas. A reliable, perfect soldering of the components to be applied with the Landing areas are therefore not possible.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, eine Druckschablone der eingangs erwähnten Art zu schaffen, die es ermöglicht, den Landeflächen einer mit auf der zu bedruckenden Oberfläche mit Erhebungen versehenen Leiterplatte genau definierte Lotmaterialmengen zuzuordnen.The present invention has for its object a To create printing stencil of the type mentioned that it enables the landing areas of one to be printed on Surface with raised circuit board exactly assign defined quantities of solder material.
Erfindungsgemäß wird diese Aufgabe durch die im kennzeichnenden Teil des Hauptanspruches angegebenen Merkmale gelöst.According to the invention, this task is characterized by Part of the main claim specified features solved.
Bei einer solchermaßen ausgebildeten Druckschablone ist besonders vorteilhaft, daß besonders empfindliche Bereiche einer Leiterplatte z. B. Goldkontakte mit z. B. einer Schutzfolie abgedeckt werden können, wobei diese Abdeckungen während des Druckvorganges bestehen bleiben, ohne daß es zu Beeinträchtigungen der Druckqualität kommt.With a printing stencil designed in this way particularly advantageous that particularly sensitive areas a circuit board z. B. gold contacts with z. B. a protective film can be covered, these covers during the Printing process persist without it Impairment of print quality is coming.
Weitere vorteilhafte Ausgestaltungen sind in den Unteransprüchen angegeben.Further advantageous configurations are in the Subclaims specified.
Anhand eines in der Zeichnung dargestellten Ausführungsbeispieles sei der erfindungsgemäße Gegenstand näher erläutert, und zwar zeigenUsing one shown in the drawing Embodiment of the subject of the invention is closer explained and show
Fig. 1 einen Längsschnitt durch eine Druckschablone und eine Leiterplatte Fig. 1 shows a longitudinal section through a printing template and a circuit board
Fig. 2 eine Draufsicht auf einen Ausschnitt einer Leiterplatte mit Landeflächen, die mit Lotpaste versehen sind. Fig. 2 is a plan view of a section of a circuit board with landing areas which are provided with solder paste.
Wie aus der Zeichnung, insbesondere aus Fig. 1 hervorgeht, sind in der Druckschablone 1 Durchbrüche 2 vorhanden, die auf der Leiterplatte 3 vorhandenen, als Anschlußmittel dienenden Landeflächen 4 zugeordnet sind. Außerdem weist die Druckschablone 1 Ausnehmungen 5 auf, die zur Überbrückung von auf der Leiterplatte 3 vorhandenen, als Abdeckung bestimmter Leiterplattenbereiche vorgesehenen Erhebungen 6 dienen. As can be seen from the drawing, in particular from FIG. 1, openings 2 are present in the printing template 1 and are assigned to landing areas 4 which are present on the printed circuit board 3 and serve as connecting means. In addition, the printing stencil 1 has recesses 5 which are used to bridge elevations 6 provided on the printed circuit board 3 and intended to cover certain printed circuit board areas.
Die Druckschablone 1 ist eine dünne, aus Messing hergestellte Platine, in deren der Leiterplatte 3 zugewandten einen Oberfläche 1a die Ausnehmungen 5 vorhanden sind, die vorzugsweise durch einen Ätzvorgang in diese Oberfläche 1a eingebracht sind.The stencil sheet 1 is a thin, made of brass plate, in which the circuit board 3 facing a surface 1 a, the recesses 5 are provided which are preferably introduced by an etching process in this surface 1 a.
Die Erhebungen 6 werden durch eine Schutzfolie (Lötstopplack) verursacht, die auf bestimmte Bereiche der zu bedruckenden Oberfläche 3a der Leiterplatte 3 vor dem Druckvorgang aufgebracht wird. Diese bestimmten Bereiche sind mit Goldkanten 7 versehen, die während der Weiterverarbeitung der Leiterplatte 3 unbedingt vor Verschmutzungen zu schützen sind. Die die Erhebungen 6 darstellende Schutzfolie (Lötstopplack) kann dann, wenn es der Arbeitsprozeß zuläßt, nach dem Druckvorgang durch Abziehen wieder von den Goldkontakten 7 entfernt werden.The elevations 6 are caused by a protective film (solder mask), which is applied to certain areas of the surface 3 a to be printed on the circuit board 3 before the printing process. These specific areas are provided with gold edges 7 , which must be protected from contamination during further processing of the printed circuit board 3 . The protective film (solder mask) representing the elevations 6 can then, if the working process permits, be removed from the gold contacts 7 again by pulling them off after the printing process.
Zum Bedrucken wird die Druckschablone 1 auf die zu bedruckende Seite 3a der Leiterplatte 3 aufgelegt, wobei die in der Druckschablone 1 vorhandenen Durchbrüche 2 den entsprechenden, auf der Leiterplatte 3 vorhandenen Landeflächen 4 zugeordnet werden. Bei jedem Druckvorgang wird ein Druckrakel 8 in Pfeilrichtung über die Druckschablone 1 hinwegbewegt. Das Druckrakel 8 bewirkt dabei, daß die Durchbrüche 2 der Druckschablone 1 mit Lotmaterial 9 ausgefüllt werden. Die Schichtdicke des Lotmaterials 9 entspricht dabei der Dicke der Druckschablone 1.For printing, the printing template 1 is placed on the side 3 a of the printed circuit board 3 to be printed, the openings 2 in the printing template 1 being assigned to the corresponding landing areas 4 present on the printed circuit board 3 . With each printing process, a squeegee 8 is moved over the printing stencil 1 in the direction of the arrow. The squeegee 8 causes the openings 2 of the stencil 1 to be filled with solder material 9 . The layer thickness of the solder material 9 corresponds to the thickness of the printing stencil 1 .
Normalerweise, d. h. bei der herkömmlichen Druckschablonenart entsprechen die Flächenabmessungen der Durchbrüche 2 denen der Landeflächen 4, und zwar, weil die Dicke der Druckschablone 1 so gewählt ist, daß den Landeflächen 4 bei diesen Flächenabmessungen der Durchbrüche 2 während des Druckvorganges die zum Verlöten der Bauteile richtige Menge an Lotmaterial 9 zugeordnet wird. Normally, that is, in the conventional type of printing stencil, the area dimensions of the openings 2 correspond to those of the landing areas 4 , specifically because the thickness of the printing stencil 1 is selected such that the landing areas 4 with these area dimensions of the openings 2 during printing process have the correct dimensions for soldering the components Amount of solder material 9 is assigned.
Werden in die eine Seite 1a der Druckschablone 1 Ausnehmungen 5 eingebracht, so ist es oft nicht möglich, die Dicke der Druckschablone 1 so zu wählen, daß bei gleichen Flächenabmessungen der Durchbrüche 2 und der Landeflächen 4 diesen während des Druckvorganges die richtige Menge an Lotmaterial 9 zugeordnet wird. Das ist immer dann der Fall, wenn die einzubringenden Ausnehmungen 5 so tief auszuführen sind, daß schon aus konstruktiven Gründen eine wesentlich dickere Druckschablone verwendet werden muß.Be a of the stencil sheet 1 the recesses 5 is introduced into the one side 1, so it is often not possible to choose the thickness of the stencil sheet 1 so that in the same area dimensions of the openings 2 and the land surfaces 4 thereto during the printing operation, the right amount of solder material 9 is assigned. This is always the case when the recesses 5 to be made are to be made so deep that a considerably thicker printing stencil must be used for structural reasons alone.
Das Ausführungsbeispiel zeigt eine Druckschablone 1, die wegen der vorhandenen Gegebenheiten (Höhe der Erhebungen 6, mechanische Festigkeit der Druckschablone 1) etwa doppelt so dick ist, wie es von der den Landeflächen 4 zuzuordnenden Menge an Lotmaterial 9 notwendig wäre, wenn die Druchbrüche 2 und die Landeflächen 4 die gleichen Flächenabmessungen aufweisen würden. Um das Zuordnen der richtigen Menge an Lotmaterial zu gewährleisten, sind die Durchbrüche 2 dieser Druckschablone 1 von der Fläche her nur halb so groß wie die Abmessungen der Landeflächen, so daß wiederum ein ausgeglichenes Verhältnis vorliegt.The exemplary embodiment shows a printing stencil 1 which, because of the existing conditions (height of the elevations 6 , mechanical strength of the printing stencil 1 ), is approximately twice as thick as would be necessary from the amount of solder material 9 to be assigned to the landing areas 4 if the breakthroughs 2 and the landing areas 4 would have the same area dimensions. In order to ensure the assignment of the correct amount of solder material, the openings 2 of this printing stencil 1 are only half as large as the dimensions of the landing surfaces, so that again there is a balanced relationship.
Wie speziell aus Fig. 2 hervorgeht, sind die Durchbrüche 2 in der Druckschablone 1 so angeordnet, daß, wenn die Druckschablone 1 auf die Leiterplatte 3 gelegt wird, die Durchbrüche 2 den Landeflächen 4 so zugeordnet sind, daß die beiden sich zugewandten Begrenzungslinien 4′ von zwei ein und demselben (SMD)-Bauteil zugehörigen Landeflächen 4 nur teilweise so abgedeckt sind, daß die durch die Druckschablone 1 abgedeckten Bereiche 4′′ der Landeflächen 4 U-förmig sind.As is apparent especially from Fig. 2, the openings 2 are arranged in the stencil sheet 1 so that when the printing stencil is placed on the printed circuit board 3 1, the openings 2 are assigned to the land surfaces 4 so that the two mutually facing boundary lines 4 ' of two one and the same (SMD) component associated landing areas 4 are only partially covered so that the areas covered by the stencil 1 4 '' of the landing areas 4 are U-shaped.
Claims (9)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883810151 DE3810151A1 (en) | 1988-03-25 | 1988-03-25 | Printing template (stencil) |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19883810151 DE3810151A1 (en) | 1988-03-25 | 1988-03-25 | Printing template (stencil) |
Publications (2)
Publication Number | Publication Date |
---|---|
DE3810151A1 DE3810151A1 (en) | 1989-10-05 |
DE3810151C2 true DE3810151C2 (en) | 1992-05-21 |
Family
ID=6350699
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19883810151 Granted DE3810151A1 (en) | 1988-03-25 | 1988-03-25 | Printing template (stencil) |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE3810151A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4016992A1 (en) * | 1990-05-26 | 1991-11-28 | Bosch Gmbh Robert | Printing screen for electric elements on irregular boards - is shaped by inelastic imprint from rubber overlay for fitting to areas between crossing structures |
DE4142658A1 (en) * | 1991-12-19 | 1993-06-24 | Siemens Ag | Deposition of solder pattern on circuit boards - applying charge drum collecting pattern of soldered powder particles for transfer to board. |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4004602A1 (en) * | 1990-02-15 | 1991-08-29 | Asea Brown Boveri | METHOD FOR PRELIMINATING A SUBSTRATE |
DE4015292A1 (en) * | 1990-05-12 | 1991-11-14 | Bosch Gmbh Robert | Printing grid for PCB components - has cut away portions overlying different heights of substrate allowing grid to lie flat on carrier |
DE19733123A1 (en) * | 1997-07-31 | 1998-10-29 | Siemens Nixdorf Inf Syst | Method of generating solder paste print with fine structures on substrate |
WO2002032203A1 (en) * | 2000-10-11 | 2002-04-18 | Telefonaktiebolaget L M Ericsson (Publ) | A method of making a gasket on a pcb and a pcb |
EP1198164A1 (en) * | 2000-10-11 | 2002-04-17 | Telefonaktiebolaget L M Ericsson (Publ) | A method of making a gasket on a PCB and a PCB. |
DE102012112546A1 (en) * | 2012-12-18 | 2014-06-18 | Endress + Hauser Gmbh + Co. Kg | Method for manufacturing mixed printed circuit board of measuring device, involves printing stencil with solder paste, and fitting surface mount device components with side of board, where components are soldered during soldering process |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3516155A (en) * | 1967-02-02 | 1970-06-23 | Bunker Ramo | Method and apparatus for assembling electrical components |
US4088825A (en) * | 1976-08-04 | 1978-05-09 | General Electric Company | Electric furnace wall construction |
JPS55138294A (en) * | 1979-04-11 | 1980-10-28 | Matsushita Electric Ind Co Ltd | Method of forming through hole connector |
-
1988
- 1988-03-25 DE DE19883810151 patent/DE3810151A1/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4016992A1 (en) * | 1990-05-26 | 1991-11-28 | Bosch Gmbh Robert | Printing screen for electric elements on irregular boards - is shaped by inelastic imprint from rubber overlay for fitting to areas between crossing structures |
DE4016992C2 (en) * | 1990-05-26 | 1999-05-12 | Bosch Gmbh Robert | Printing stencil for screen printing of electrical components and structures on a carrier plate with unevenness |
DE4142658A1 (en) * | 1991-12-19 | 1993-06-24 | Siemens Ag | Deposition of solder pattern on circuit boards - applying charge drum collecting pattern of soldered powder particles for transfer to board. |
Also Published As
Publication number | Publication date |
---|---|
DE3810151A1 (en) | 1989-10-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
OP8 | Request for examination as to paragraph 44 patent law | ||
D2 | Grant after examination | ||
8364 | No opposition during term of opposition | ||
8320 | Willingness to grant licenses declared (paragraph 23) | ||
8339 | Ceased/non-payment of the annual fee |