Abstract: Provided is a liquid discharge head substrate including: a substrate; a heating resistor layer formed on the substrate; a flow path for a liquid; a wiring layer stacked on the heating resistor layer and having an end portion which forms a step portion on the heating resistor layer; and a protective layer covering the heating resistor layer and the wiring layer including the step portion, and formed between the heating resistor layer and the flow path, in which the protective layer is formed by a Cat-CVD method.

Abstract: A printhead in which the voltage fluctuation absorption range of a MOS transistor serving as a constant current source is narrowed according to constant current driving. The printhead includes a controller which controls voltage fluctuations to adjust a current supplied to a plurality of printing elements. The printhead also includes a DC/DC converter which outputs a voltage of a voltage value to be applied to a plurality of printing elements from outside a printing element substrate.

Abstract: A fuse element can be reliably blown and data that corresponds to whether or not the fuse element has been blown can be stored with high reliability. A resistor element is provided in a circuit through which an electric current flows to blow the fuse element in the ink jet printing head. The resistor element adjusts the electric current so that, in the process of blowing the fuse element, the current continues to flow for a predetermined duration even after a maximum current has passed through the fuse element. The predetermined duration is longer than a period from a time point when the electric current rises to a time point when the electric current reaches the maximum current.

Abstract: A base for a liquid discharge head includes a heat element which forms an exothermic portion 108, an electrode wire 105 that is electrically connected with the heat element, an insulative protective layer 106 provided above the heat generating resistive element and the electrode wire and an upper protective layer 107 provided on the protective layer. The upper protective layer is made from a TaSi alloy containing 22 at. % or more Si.

Abstract: For providing a base for a liquid discharge head having an internal surface of a liquid flow path and a discharge port, suppressed in swelling by liquid and having high precision and high reliability, the base including a base member, an energy generating element for discharging a liquid, formed on the base member, and a resin structure having a liquid discharge port for discharging the liquid and disposed on the base member so as to cover the energy generating element, is provided with a protective layer. The protective layer is formed by a catalytic chemical vapor deposition on a surface of the resin structure in which the liquid discharge port is opened.

Abstract: The invention provides a substrate for a liquid discharge head having a heat generating resistor layer, wiring electrically in contact with the heat generating resistor layer, an insulating protection layer that covers the heat generating resistor layer and the wiring, and a liquid passage that are formed in order on an insulating layer formed on a base plate. The insulating protection layer being a layer formed by radical shower CVD.

Abstract: An ink jet head circuit board is provided which has heaters to generate thermal energy for ejecting ink as they are energized. This circuit board is so constructed as to reduce wire resistances for the heaters while at the same time preventing an increase in the size of the board and realizing a high-density integration of the heaters required for high resolution printing. This construction is made possible by forming electrode wires of first and second electrode wire layers to reduce an area that the wire patterns for the heater occupy on the circuit board. In reducing the effective thickness of protective insulation layer formed on the heater to prevent a possible degradation of thermal efficiency, one of the protective insulation layers over the electrode wires is removed from the heater, depending on the thickness of the electrode wires.

Abstract: An ink jet print head substrate capable of precisely blowing fuse element to store data reliably is provided. An ink jet print head incorporating such a substrate and an ink jet printing apparatus are also provided. The interlayer insulating film formed over the fuse element is made of a material that has a lower melting point than the material of the fuse element and which forms a cavity therein by heat produced when the fuse elements is blown.

Abstract: An ink jet head circuit board is provided which has heaters to generate thermal energy for ink ejection as they are energized. This circuit board reduces areas of the heaters to achieve higher printing resolution and image quality. This board also prevents a degradation of thermal energy efficiency and reduces power consumption. The protective insulation layer for the electrode wire layer is formed of two layers and one of the two layers is removed from above the heater to improve the heat energy efficiency. The resistor layer is deposited over the electrode wire layer. The patterning for removing the protective insulation layer is done in a wider range than a gap of the electrode wire layer, the gap being used to form the heater. Further, by forming the electrode wires in two layers, a possible reduction in an effective bubble generation area of the heater can be prevented.

Abstract: An ink jet recording method of ejecting ink using an ink jet head substrate provided with a heat generating resistor which is coated with a protecting film, wherein the ink is ejected by a pressure produced by generation of a bubble created by film boiling of the ink caused by application of thermal energy to the ink through the protecting film, the thermal energy being generated by driving of the heat generating resistor, the improvement residing in that: there is provided a recording mode in which the ink is ejected with a maximum temperature at the surface of the protecting film which is contacted to the ink not higher than 560° C.

Abstract: A semiconductor device includes a lateral end surface and a connection electrode for external electrical connection. The connection electrode is exposed at the side surface. A manufacturing method of the semiconductor device includes steps of forming a linear recess in a silicon substrate between adjacent semiconductor devices, forming, on an inner surface of the recess, the electrode for external electrical connection of one of the semiconductor devices, and a step of separating the one semiconductor device from another on the silicon substrate by cutting the silicon substrate along the linear recess. Forming the electrode includes steps of forming a metal thin film astride a cutting line at which the silicon substrate is to be cut, forming a resist layer and patterning the resist layer on the metal thin film, growing metal at a portion not having the patterned resist layer, and removing the patterned resist layer and the metal thin film below the patterned resist layer.

Abstract: This invention relates to a printhead substrate capable of suppressing an increase in wiring width and an increase in the size of a substrate formed by a film forming process while increasing the number of simultaneously driven printing elements in order to improve the printing performance, a printhead using the substrate, and a printing apparatus using the printhead. The wiring lines of the substrate are formed into a common wiring line, and energy applied to a heating resistance element is prevented from deviating from a stable ink discharge range owing to the difference in the number of simultaneously driven heating resistance elements. For this purpose, a driving element is greatly downsized in comparison with a conventional one, and the operation region of a MOS transistor is shifted from the non-saturation region to the saturation region.

Abstract: In an ink jet head circuit board including a heater for generating thermal energy used for ejecting ink in response to application of electricity, a drop in thermal energy efficiency is prevented while reducing an area of the heater to achieve higher-resolution and higher-image-quality printing, and damages on the heater attributable to a manufacturing process are avoided. To achieve this, a resistor layer is disposed on an electrode wire layer; and two protective layers are disposed thereon. Then the upper protective layer is removed in a site above the heater. Accordingly, it is possible to dispose the protective layers without causing a decrease in an effective bubble generating region, and to improve thermal energy efficiency by reducing the effective thickness of the protective layer above the heater. Moreover, the resistor layer is covered with the first protective layer and is thereby prevented from adverse effects in the manufacturing process such as etching processes.

Abstract: An ink jet print head substrate capable of precisely blowing fuse element to store data reliably is provided. An ink jet print head incorporating such a substrate and an ink jet printing apparatus are also provided. The interlayer insulating film formed over the fuse element is made of a material that has a lower melting point than the material of the fuse element and which forms a cavity therein by heat produced when the fuse elements is blown.

Abstract: An ink jet print head substrate capable of precisely blowing fuse element to store data reliably is provided. An ink jet print head incorporating such a substrate and an ink jet printing apparatus are also provided. The interlayer insulating film formed over the fuse element is made of a material that has a lower melting point than the material of the fuse element and which forms a cavity therein by heat produced when the fuse elements is blown.

Abstract: A printhead in which the voltage fluctuation absorption range of a MOS transistor serving as a constant current source is narrowed according to constant current driving. The printhead includes a controller which controls voltage fluctuations to adjust a current supplied to a plurality of printing elements. The printhead also includes a DC/DC converter which outputs a voltage of a voltage value to be applied to a plurality of printing elements from outside a printing element substrate.

Abstract: A fuse element can be reliably blown and data that corresponds to whether or not the fuse element has been blown can be stored with high reliability. A resistor element is provided in a circuit through which an electric current flows to blow the fuse element in the ink jet printing head. The resistor element adjusts the electric current so that, in the process of blowing the fuse element, the current continues to flow for a predetermined duration even after a maximum current has passed through the fuse element. The predetermined duration is longer than a period from a time point when the electric current rises to a time point when the electric current reaches the maximum current.

Abstract: A fuse element can be reliably blown and data that corresponds to whether or not the fuse element has been blown can be stored with high reliability. A resistor element is provided in a circuit through which an electric current flows to blow the fuse element in the ink jet printing head. The resistor element adjusts the electric current so that, in the process of blowing the fuse element, the current continues to flow for a predetermined duration even after a maximum current has passed through the fuse element. The predetermined duration is longer than a period from a time point when the electric current rises to a time point when the electric current reaches the maximum current.

Abstract: In order to form a more homogenous heat generating resistive layer, the present invention provides a method of manufacturing a substrate for an ink jet recording head having a support which has an insulative layer on its surface, a pair of electrode layers disposed on the surface of the support, and a heat generating resistive layer which continuously covers the pair of electrode layers and a section between the pair of electrode layers. The method includes the step of forming an electrode layer on the support and the step of forming the pair of electrode layers by etching the electrode layer. In the step of forming the pair of electrode layers by etching the electrode layer, by etching a surface portion of the insulative layer positioned between the pair of insulative layers, a recess is formed in the surface portion of the insulative layer.

Abstract: The present invention provides a metallic engaging element of vintage type which is cheap and has a required fixing strength and a slide fastener using the same engaging element, wherein each of a pair of leg portions formed so as to branch to right and left sections from the bottom of a body portion of the engaging element is formed into a L-like sectional shape including a sheet-like nipping portion and a leg portion side wall, the sheet-like nipping portion has notch portions for sandwiching one side edge portion of a fastener tape from the front and rear surfaces thereof, and at least one projecting portion is formed in each of leg portion inner wall surfaces opposing the one side edge portion of the fastener tape in the leg portion side wall.