Extremely strict cleanliness management and quality control are what make submicron manufacturing so expensive. In contrast, things like sound chips--having fewer circuits--require less rigorous methods, with process dimensions as large as a micron or so.
精密的潔淨控制與品管過程，見「次微米工廠」身價昂貴的原因。簡單一點的電動玩具、音樂卡 IC 沒有那麼多線路，不用如此費心，只需要在一微米上下就可以做了。