Glass-fiber thermal inkjet print head
View Patent ↗A page-wide inkjet print head is formed by assembling individual glass fiber tube sections, which are then sintered together drawn to thin or neck the diameter of the orifices, slicing the glass tube sections and depositing individual semiconductor control circuits in or approximate to the top of the glass tube sections. Ink reservoirs can supply water based ink that flows through the glass tube sections but which is held in place by capillary action. Ink is ejected by heating a semiconductor resistive element deposited into one open end of the tube section so as to cause the ink to be ejected onto a print medium.
1. A controller for a print head comprised of:
a. a series of multi-terminal latching current sources, each current source having first, second and third inputs and first and second outputs said series of multi-terminal latching current source configured to have:
1) the first current source having its first and second inputs coupled to a first signal source and the third input coupled to a second signal source, said first output of said first current source coupled to a heater resistor for said print head;
2) each of the other N-number of multi-terminal latching current sources coupled in series behind said first current source whereby the N th multi-terminal latching current source has its first input coupled to said first signal source, its second input coupled to said second output of the N-1 th multi-terminal latching current source and the third input of the N th multi-terminal latching current source coupled to said second signal source, said first output of said N th current source being coupled to an N th heater resistor for said print head;
whereby said multi-terminal latching current sources are sequentially latched to a conductive state by a sequence of synchronous voltage pulses on both said first and second signal sources.