ABOUT THE CHOICE OF THE INITIAL SIDE OF A SPHERICAL GLASS LENS PROCESSING

The article analyzes the choice of the initial side of a spherical glass lens processing. The analysis was carried out on the basis of a survey of employees of the optical shop and familiarization with the description of a typical technological process for manufacturing lenses at one of the instrument-making enterprises in Novosibirsk, as well as by a retro-review of technical publications on the manufacture of optical parts. Two schemes of decision-making about the initial side of spherical lens processing are revealed: selection (assignment) or calculation by formula. The results of the analysis are formulated and the tasks of further research are defined.

Investigation of a proactive glass filler removal in IC substrate build up films and its effect on topography and copper adhesion reliability

In order to achieve interconnections at extremely small scale, the latest build up laminates contain increasing amounts of spherical glass fillers, which are needed to compensate the CTE mismatch between the epoxy based resin matrix and the electroplated copper circuits. Desmear of the resin surface during industrial processing exposes these glass fillers and weakens their anchoring in the surrounding resin matrix, which decreases adhesion strength of the plated copper. We describe a newly developed cleaner process for the removal of glass fillers in industrially important build-up materials. Its effects on cleanliness and copper to resin adhesion is described in detail and illustrated by SEM imaging. Finally we propose a mechanism, explaining the adhesion increase as compared to standard processing and fluoride etch treatment.