PEM FOR ELECTROCHEMICAL ETCHED TRANSISTORS
Final progress rept. 19 May 1961-19 May 1963
PHILCO CORP LANSDALE PA
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A brief introduction giving background which influenced implementation of the program is followed by discussions of design considerations and specific problems encountered during fabrica tion and check-out of the prototype whisker attaching machine. Difficulties in the areas of machine layout to accommodate the several major subassemblies are described and the methods of obtaining the required accurate positioning of transistor blank and whiskers are discussed. Some of the characteristics of the machine are listed, and a functional description is given of the over-all machine operating cycle and of the whisker plating and soldering steps. Production capability of the machine has been evaluated at 2680 actual starts per shift machine cycle time indicates 3200 starts possible. Final test yield to the applicable specification was 36 however, 90 of the gross input to final test represented salable transistors in the family covered by the specification.
- Industrial Chemistry and Chemical Processing