Abstract:
An ink-jet printhead and a manufacturing method thereof include a substrate on which a space portion is formed, a passage plate installed on the substrate in which an ink chamber is formed to store ink, a nozzle plate installed at a top surface of the passage plate in which a nozzle is formed to eject the ink, and a vibration plate disposed between the substrate and the passage plate to generate a pressure for ejecting the ink by changing a volume of the ink chamber. The vibration plate includes a base layer formed at a top surface of the substrate so as to cover at least a part of the space portion, a thin film shape memory alloy layer which contacts the ink contained in the ink chamber and varies according to a temperature variation, a heating element disposed between the base layer and the thin film shape memory alloy to generate heat, and an insulating layer disposed between the heating element and the thin film shape memory alloy layer and transfers the heat generated by the heating element to the thin film shape memory alloy layer. Due to a stable temperature coefficient of resistance (TCR) of the heating element, a height and a width of a voltage supplied to the heat element can be easily controlled, and thus power of the vibration plate can be precisely controlled, thereby having a predetermined image quality, and the heating element does not contact directly the ink, thereby realizing stability of the ink-jet printhead.
Abstract:
A method of managing a user key for a broadcast encryption. The method includes assigning numbers to respective users and arranging the users on a ring-shaped structure in order to map hash chains onto the respective nodes of a ring-shaped structure. The method further includes making random node keys correspond to the respective nodes, one by one, constructing the hash chains from the corresponding node keys using a hash function, and successively mapping the constructed hash chains onto the nodes of the ring-shaped structure.
Abstract:
A control device authentication method in a home network system which includes a slave, a home server which controls the slave, and the control device which performs a remote control function to control the home server, includes registering the control device to the home server; generating and storing, by the control device and the home server, a one-way function set; storing, by the control device and the home server, a code value of a button pressed at the control device; creating, by the control device, a first password by performing an operation using a pointer value, the code value, and a one-way function number; requesting, by the control device, authentication by transferring the pointer value, the one-way function number, and the first password to the home server; and creating, by the home server, a second password.
Abstract:
Thermal inkjet printheads and an inkjet image forming apparatus including the thermal inkjet printheads. Each of the thermal inkjet printheads includes a heater that heats ink by directly contacting the ink and is formed of an alloy of Pt—Ru or an alloy of Pt—Ir—X, where X is at least a material selected from the group consisting of Ta, W, Cr, Al, and O.
Abstract:
An inkjet printhead and a method of manufacturing the same. The inkjet printhead may include a substrate in which a manifold to supply ink is formed in a lower portion of the substrate and a plurality of ink feed holes connected to the manifold are formed in an upper portion of the substrate, feed hole guides that are formed on inner sidewalls of the ink feed holes to define lengths of the ink feed holes, a chamber layer stacked on the substrate, the chamber layer including a plurality of ink chambers connected to the ink feed holes, a plurality of heaters to heat ink inside the ink chambers to generate bubbles, and a nozzle layer stacked on the chamber layer, the nozzle layer including a plurality of nozzles, the ink being ejectable through the nozzles.
Abstract:
A bubble-ink jet print head includes: a substrate having ink chambers to store ink and resistance heat emitting bodies to heat ink disposed thereover; and an ink supply passage which penetrates the substrate and which is connected with the ink chambers. The ink supply passage includes: a first trench formed at a first surface of the substrate in a first pattern having a separating distance from at least one of inlets of the ink chambers and connecting portions between the adjacent ink chambers, the first surface of the substrate having the ink chambers disposed thereover, and a second trench formed at a second surface of the substrate in a second pattern, having one of an area equal to and an area smaller than that of the first trench in the range of the first pattern of the first trench, and in communication with the first trench.
Abstract:
A photo-curable resin composition, a method of patterning the same, an ink jet head, and a method of fabricating the same. The photo-curable resin composition includes an epoxy compound, a photo-catalyst provided as a photo-initiator, and a non-photo reactive solvent. The photo-catalyst may be a semiconductor material to generate electron-hall pairs using light energy. The semiconductor material is one selected from a group consisting of TiO2, CdS, Si, SrTiO3, WO, ZnO, SnO2, CdSe and CdTe, CdSe and CdTe. The epoxy compound may include a di-functional epoxy compound and a multi-functional epoxy compound. The non-photo reactive solvent may be one or a mixture selected from a group consisting of gamma-butyrolactone (GBL), cyclopentanone, C1-6 acetate, tetrahydrofurane (THF), and xylene. The photo-curable resin composition is patterned to form a fluid channel structure of the ink jet head.
Abstract:
A photo-curable resin composition, a method of patterning the same, an ink jet head, and a method of fabricating the same. The photo-curable resin composition includes an epoxy compound, a photo-catalyst provided as a photo-initiator, and a non-photo reactive solvent. The photo-catalyst may be a semiconductor material to generate electron-hall pairs using light energy. The semiconductor material is one selected from a group consisting of TiO2, CdS, Si, SrTiO3, WO, ZnO, SnO2, CdSe and CdTe, CdSe and CdTe. The epoxy compound may include a di-functional epoxy compound and a multi-functional epoxy compound. The non-photo reactive solvent may be one or a mixture selected from a group consisting of gamma-butyrolactone (GBL), cyclopentanone, C1-6 acetate, tetrahydrofurane (THF), and xylene. The photo-curable resin composition is patterned to form a fluid channel structure of the ink jet head.
Abstract:
A thermally driven inkjet printhead includes a substrate, a heater formed on the substrate, a chamber layer stacked on the substrate to define an ink chamber on an upper portion of the heater and an ink feed hole to supply ink to the ink chamber at one side of the ink chamber, an intermediate layer stacked on the chamber layer in which a through hole connected to the ink chamber is formed, and a nozzle layer stacked on the intermediate layer in which a nozzle connected to the through hole is formed. The through hole is connected to the ink feed hole and has a smaller cross-sectional area than a size of the heater.
Abstract:
An Inkjet printhead and a method of manufacturing the same. The inkjet printhead includes a substrate having an ink feedhole, a chamber layer formed on the substrate to define an ink chamber filled with ink supplied though the ink feedhole, and a nozzle layer formed on the chamber layer and having one or more nozzles to eject the ink filled in the chamber, wherein the chamber layer and the nozzle layer are made of solid film resists.