SEMICONDUCTOR THERMAL PRINTING DEV-CE

摘要

1479111 Selective printing INTERNATIONAL BUSINESS MACHINES CORP 22 July 1975 [29 Aug 1974] 30555/75 Heading B6F Thermographic print head has a semiconductor substrate 24 with thermally and electrically isolated heating elements 6 whose surface adjacent the substrate is of smaller area than its face opposite the substrate. The substrate may be silicon of crystallographic orientation (100) or (111). The truncated pyramidal shaped elements 6 are separated by insulating material and arranged in a 5 x 4 array. A pair of heavily doped regions 7 connect each element 6 via aluminium conductors 28 to a potential source and transistor 4.