半導体整流素子製造に対するオンライン品質工学の検討

抄録

In　manufacturing　processes,　how　to　improve　quality　and　reduce　cost　is　mostly determined　by　experience　or　from　the　past　records.　If　temperature　affects　product　quality,　for　example,　we　need　to　determine　the　temperature　measuring interval　and　control　limits　for　adjustment.　But　such　traditional　approaches　are neither　theoretical　nor　economical.　Those　controlling　conditions　vary　from　time to　lime　depending　on　different　situations.　The　economical　aspect　such　as　how much　cost　should　be　spent　to　monitor,　temperature　for　example,　and　maintain quality　has　been　neglected　most　of　the　time. In　the　Quality　Engineering　approach,　the　optimum　controlling　conditions　are determined　by　balancing　the　cost　of　control　and　the　cost　of　quality.　This approach　is　effective　and　widely　applicable　to　all　manufacturing　processes.　This paper　reports　a　successful　case　which　was　applied　to　a　manufacturing　process of　semiconductor　rectifiers.　In　the　process,　the　temperature　measuring　interval was　determined　such　that　the　cost　was　reduced　while.　the　quality　was　maintained,　This　contributed　to　customer　satisfaction.