Abstract: A method of manufacturing an inkjet head that includes: forming in a first board an inlet, which penetrates the first board and through which ink may flow in, and a pressure chamber, which is formed as a recess in a surface of the first board; forming in a second board a manifold, which is to be connected with the inlet, a pressure absorbing space, which is positioned adjacent to the manifold and partitioned by a membrane, and an ink channel, which penetrates the second board and which is to be connected with the pressure chamber; forming in a third board a nozzle, which is to be connected with the ink channel; and stacking in order and attaching the first board, the second board, and the third board. This method can be utilized to simplify the manufacturing process and prevent crosstalk between pressure chambers, thereby providing a higher printing quality.

Abstract: A method for manufacturing an ink-jet head is disclosed. The method for manufacturing an ink-jet head including a chamber containing an ink, a reservoir connected with the chamber and supplying the ink to the chamber, a restrictor connected with the chamber and the reservoir and controlling a flow of the ink, a nozzle connected with the chamber and jetting the ink, and a channel connecting the nozzle to the chamber, may include: forming the chamber, the reservoir, the restrictor and the channel by etching a portion of a substrate; covering the chamber; and bonding a nozzle plate, in which a nozzle is formed, to the substrate such that the channel is covered. Using this method, the various structures of the ink-jet head may be formed by etching a substrate, whereby the process may be simplified, and the yield and reliability of the products can be improved.

Abstract: An ink-jet head and a method of manufacturing the ink-jet head are disclosed. The ink-jet head may include: an upper substrate, formed by processing a chamber in a silicon substrate; a middle substrate, bonded to the upper substrate and formed by processing an ink channel, which connects with the chamber, in a glass substrate; and a lower substrate, bonded to the middle substrate and formed by processing a nozzle, which connects with the ink channel, in a silicon substrate. With certain embodiments of the invention, a high level of precision may be obtained for the structures formed in the upper substrate and the lower substrate, and the middle substrate may be manufactured in low cost. Also, the substrates may be bonded together in a facilitated manner, so that production yield may be increased.

Abstract: An ink-jet head is disclosed. The ink-jet head may include: a chamber containing an ink; a reservoir connected with the chamber to supply the ink to the chamber; a restrictor connected with the chamber and the reservoir to control a flow of the ink; a nozzle connected with the chamber to jet the ink, and located at a position corresponding to where a pressure supplied to the chamber is the maximum; and an actuator supplying a pressure to the chamber such that the ink is jetted. The ink-jet may be operated with a lower driving voltage, and the ink may be jetted in a more stable manner.

Abstract: A method and apparatus for calculating the natural frequency of an ink-jet head are disclosed. With a method of determining a natural frequency of an ink-jet head operated by a piezoelectric actuator by joining a sensor to the piezoelectric actuator, which includes supplying electrical power to the piezoelectric actuator; receiving data on the vibration of the ink-jet head as input from the sensor and storing the data; transforming the data and outputting a vibration waveform of the ink-jet head; and analyzing the vibration waveform and to determine the natural frequency of the ink-jet head ink-jet head, the natural frequency of the ink-jet head of high reliability may be determined. In addition, the time required for detecting natural frequency may be reduced.

Abstract: An inkjet printer head and fabricating method thereof are disclosed. An inkjet printer head, which includes: a lower board, in which a nozzle part and a restrictor are formed; an upper board attached to an upper portion of the lower board, in which an ink chamber and an ink inlet are formed; and a piezoelectric element joined to a membrane of the upper board, where the membrane is formed by the portions remaining after portions of the upper board are removed to form the ink chamber, is formed by attaching two boards by an attachment method that does not use a separate adhesion material, such as anodic bonding, for a simple and easy attachment, and for a strong head structure in which there are no chemical or physical reactions that may occur in adhesion layers.

Abstract: A method of manufacturing a nozzle for an inkjet head is disclosed. With the method of manufacturing a nozzle for an inkjet head, comprising (a) coating photoresist on an inkjet head structure comprising a nozzle part; (b) adjusting exposure conditions and performing exposure and developing on the nozzle part to remove a portion of the photoresist; (c) joining a hydrophobic layer onto the portion of the nozzle part where the photoresist has been removed; and (d) removing the photoresist remaining on the nozzle part, it is easy to control the depth of the hydrophobic layer to be uniform, and the depth to which the hydrophobic layer is deposited may be controlled even when the back surface of the nozzle has a complex shape, so that the uniformity and reproduction of the hydrophobicity-treated nozzles are improved.

Abstract: A nozzle for an inkjet head and manufacturing method thereof. With the nozzle for an inkjet head, including a first board in which a nozzle hole is perforated, a middle layer stacked on the first board and perforated in an area corresponding to the nozzle hole, and a second board stacked on the middle layer and perforated in an area corresponding to the nozzle hole, where a hydrophobic layer is joined onto the inner perimeter of the nozzle hole and onto the first board around the nozzle hole, the uniformity and reproduction quality may be improved of nozzles treated for hydrophobicity, as the depth of the hydrophobic layer may be controlled to be uniform and the deposition of the hydrophobic layer may be prevented at the back surface of the nozzles.