There is disclosed a head substrate of a printing head detachably mounted on a printer main body, comprising plural external connection terminals individually receiving, from the exterior, a binary logic signal corresponding to whether or not to execute a recording operation, a recording image signal...http://www.google.com.au/patents/US20060077215?utm_source=gb-gplus-sharePatent US20060077215 - Head substrate having data memory, printing head, printing apparatus and producing method therefor
