screen printing for printed circuit boards

silk screen printing is a much used method of producing the required images on printed circuit boards. the author discusses in detail the techniques and limitations of the process. the screen frame, stretching and glueing, pretreatment of mesh, types of stencil materials, drying, exposure, angle of image and mesh, accurate registration, i..

around the circuit board-with light and acid

a brief and informative introduction to modern printed board techniques and production methods, covering silk-screen-, photoprint- and dry film laminate processes, and basic methods (straight subtractive, substractive/additive, semi-additive and metal-resist). diagrams and process step tables are given

integration of a 'thin' and a 'thick' film resistor system on 96percent alumina results in an optimized combination of two complementary technologies

summary form only given, as follows' a conventional silk screen printing process is used to deposit on the same alumina substrate 'thin' (400 to 1400 aa) and 'thick' (100000 to 200000 aa) resistive films. due to a 135 degreesc lower firing temperature of the metallo-organic paste used on the 'thin' film system as compared with the ruo/sub..

from single clicking springs to the integrated contact point rubber mat

a new technique is described for making pcb keyboards for microelectronics, carbon conductors and carbon contact points are used in single and double layer applications. in the latter an insulating layer and an upper carbon layer are silk-screened over an initial copper-carbon circuit. through-contacting, sliding switches and printed resi..

dasll-an automatic printed circuit board layout system

dasll stands for design automation system at lawrence livermore and is a system of computer programs to automatically lay out printed circuit boards. the focus is on two-sided pcb fabrication aids: primarily drill tape, documentation, and artwork generation (including etch, silkscreen, and drill schedule artwork) limited four-layer pcbs a..

high-grade semi-finishes for modern electronics

discusses the new copper-backed base material cu 010 for micro-electronics (epoxy resin-glass silk fabric with 17.5 mum-cu-foil backed), the 17.5 mum-cu-foil for printed circuits copper-backed base material cu 47 (self-quenching) as well as the unbacked base material of type 072 for printed circuits. the most important technical parameter..

documenting prehistoric art

describes how a silkscreen printing process not only reproduces accurate renderings in size and color of the original cave painting, but also allows limited print editions to be made of each image

photography for printed circuits

deals with the techniques and processes used in the manufacture of printed circuit boards from photographic masters. the basic thesis is to produce the working photomasters, for silk screen making or photoresist imaging, using as few steps as are compatible with the required quality and resolution. various techniques will be discussed for..

silk in the news distribution system at deutsche welle (integrated communication system)

describes a local communication system for broadcasting news network. the system stores texts of messages and offers possibilities for the exchange of information between the connected participants. processors, archives, display units and printers are connected decentrally to the digital loop communications system silk, via internationall..

solder masks-screenable vs dry film systems

summary form only given. the most common methods for applying solder masks to printed circuit boards are silk screening (thermal and uv cured screen resists), and more recently the dry film process. the author compares these two application methods