Abstract: A method of manufacturing an inkjet printhead, in which a solvent included in a positive photoresist composition or in a non-photosensitive soluble polymer composition which is used to form a sacrificial layer has a different polarity from that of a solvent included in a negative photoresist composition that is used to form at least one of a channel forming layer and a nozzle layer.

Abstract: A method of manufacturing an inkjet printhead, in which a solvent included in a positive photoresist composition or in a non-photosensitive soluble polymer composition which is used to form a sacrificial layer has a different polarity from that of a solvent included in a negative photoresist composition that is used to form at least one of a channel forming layer and a nozzle layer.

Abstract: An ink jetting apparatus includes a nozzle module, a driving module, and a membrane. The nozzle module includes an ink chamber for reserving ink, and a nozzle hole for permitting ink in the ink chamber to be jetted therethrough. The driving module includes a working fluid chamber charged with working fluid, a heater disposed in the working fluid chamber, and a plurality of fins fixed to the heater, which are heated by the heater. By pressure from a bubble produced during the heating of the working fluid chamber by the heater, the membrane is curved into the ink chamber, and ink in the ink chamber is jetted through the nozzle hole. Since the bubble is divided by a plurality of fins on the heater, the bubbles disappear rapidly when the heater stops heating. Accordingly, the high-speed operation of the ink jetting apparatus becomes possible, and the ink jetting apparatus is more stably driven.

Abstract: An improved exchangeable toner cartridge installed on a developing unit of an image forming apparatus includes a first seal detachably attached to the bottom thereof for closing off a toner supplying opening formed at the bottom, and a second sealing means disposed to the outside of the first seal for preventing the leakage or spread of toner due to the poor attachment of the first seal. Alteratively, the second seal is disposed between the bottom of the toner cartridge and the first seal.