It has been several years since a ball semiconductor was proposed as a new product that would be capable of breaking through the limitation of present day semiconductors. The proposer was Ball Semiconductor Inc. which has been engaged in putting such a semiconductor into practical use. How can you build electronic circuits into a small ball? This was really a very interesting question. Risuke Toda of Ball Semiconductor has issued a report on some aspects of the micromaching of ball semiconductors in the 36. No.5 issue of the Journal of Ceramics. The objective of Toda was to create a semiconductor on a 1mm sphere having three times as much area as a 1mm{sup}2 chip. For the time being, the diameter of this spherical semiconductor is set at 1mm, but the future effort is to make it smaller.
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