Thermal ink jet printhead with bubble collapse point close to nozzle aperture

A printer system which incorporates a printhead, the printhead comprising:

• a plurality of nozzles, each defining an ejection aperture;
• a bubble forming chamber corresponding to each of the nozzles respectively, the bubble forming chambers adapted to contain a bubble forming liquid;
• and,
• at least one heater element disposed in each of the bubble forming chambers respectively, the heater elements configured for thermal contact with the bubble forming liquid;
• such that,
• the heater element can be heated to a temperature above the boiling point of the bubble forming liquid to form a gas bubble that causes the ejection of a drop of an ejectable liquid through the ejection aperture;
• and,
• the gas bubble collapsing to a collapse point after the heater element has been heated to a temperature above the boiling point of the bubble forming liquid;
• wherein,
• the collapse point of the gas bubble is less than 50 microns from the ejection aperture.

A method of ejecting drops of an ejectable liquid from a printhead, the printhead comprising a plurality of nozzles, each nozzle defining an ejection aperture;

• a bubble forming chamber corresponding to each of the nozzles respectively, the bubble forming chambers adapted to contain a bubble forming liquid;
• and,
• at least one heater element disposed in each of the bubble forming chambers respectively, the heater elements configured for thermal contact with the bubble forming liquid;
• the method comprising the steps of:
• placing the bubble forming liquid into thermal contact with the heater elements;
• heating the heater elements to a temperature above the boiling point of the bubble forming liquid to form a gas bubble such that a drop of an ejectable liquid is ejected through the ejection aperture of the corresponding nozzle;
• and,
• collapsing the gas bubble to a collapse point after the heater element has been heated to a temperature above the boiling point of the bubble forming liquid;
• wherein,
• the collapse point of the gas bubble is less than 50 microns from the ejection aperture.