Patent ID: 6193345
Filing Date: 2001-02-27
Classification: B41J

Abstract:
An inkjet print cartridge comprising:an ink supply;a substrate having a plurality of ink ejection chambers with an ink ejection element in each of said ink ejection chambers formed on a first surface of said substrate;an ink channel connecting at a first end to said ink supply and at a second end to an inlet passage connected to one of said ink ejection chambers for refilling said one of said ink ejection chambers with ink;a group of said ink ejection chambers in adjacent relationship forming a primitive in which a maximum of only one of said ink ejection chambers in said primitive is activated at a time and said primitive is one of a plurality of primitives on said substrate;first circuit means on said substrate coupled to said ink ejection elements in said ink ejection chambers;second circuit means on said print cartridge coupled to said first circuit means for transmitting ejection signals to said ink ejection elements at a frequency between approximately 15 to 60 kHz;wherein said first circuit means applying primitive select signals to select one or more of said primitives and applying address line select signals to enable devices associated with said ink ejection elements in one or more selected primitives such that a maximum of one of said ink ejection chambers in each of said selected primitive is energized at a time, causing a plurality of ink drops to be ejected from said one of said ink ejection chambers onto a media surface at a single pixel location in a single pass of said print cartridge over said media surface,wherein said ink ejection chambers are refilled with ink at approximately the same frequency that said ink drops are ejected, andwherein the number of said address line select signals is less than one-third the number of said primitive select signals.