Abstract: A liquid ejection head substrate includes a substrate, an element disposed on the substrate that generates thermal energy used for ejecting liquid, and a protective layer disposed at least at a position corresponding to the element. The protective layer contains iridium and has a density in the range of 21.0 g/cm3 to 22.7 g/cm3.

Abstract: A substrate for a liquid discharge head includes an upper protection film that covers at least a region corresponding to each of thermal energy generation elements. The upper protection film and at least one of the upper protection films adjacent to the upper protection film within a liquid chamber are respectively connected to different external electrodes, and a voltage can be applied therebetween via the different external electrodes.

Abstract: A manufacturing method for a liquid-discharge head substrate including a base material provided with an energy generating element that generates energy utilized for discharging liquid, a noble metal layer including noble metal provided on a surface of the base material on energy generating element side, and a material layer provided to come into contact with the noble metal layer. The manufacturing method includes preparing the base material on which the material layer is provided, oxidizing a part of a surface of the material layer by discharging electricity in oxygen-containing gas, and providing the noble metal layer on the base material.

Abstract: A liquid discharge head substrate includes a base; a pair of wiring lines; a heat-generating resistive layer, which is in contact with the wiring lines, and which has a portion corresponding to a space between the wiring lines, the portion forming an electrothermal transducer; an insulating layer which covers the heat-generating resistive layer and the wiring lines and which contains Si; a protective layer which covers at least one region of the insulating layer which contains Ir; and an intermediate layer which is placed between the insulating layer and the protective layer. The intermediate layer contains a material represented by the formula TaxSiyNz, where x is 5 atomic percent to 80 atomic percent, y is 3 atomic percent to 60 atomic percent, z is 10 atomic percent to 60 atomic percent.

Abstract: A simplified and less costly manufacture process of a print head can be effective in preventing the peeling-off between a substrate and a flow passage forming member. In the print head, a protective layer is formed between the flow passage forming member and a heat generating portion. The protective layer contains a noble metal. On a side of the flow passage forming member, the surface of the protective layer is made of an oxide of a noble metal, except in a portion corresponding to the heat generating portion, while in the portion corresponding to the heat generating portion on the flow passage forming member side, the surface thereof is made of the noble metal.

Abstract: An inkjet recording apparatus includes a heating unit configured to produce thermal energy for discharging ink, and two electrodes which electrically connect with each other through the ink. Voltage is applied between the two electrodes, and a current value flowing through the ink is measured. Whether the ink is discharged or not is determined by determining whether the current changes when the heating unit is driven.

Abstract: In an ink jet head using a thermal energy for ejecting ink, this invention aims to reliably and uniformly remove kogations deposited on a heat application portion in contact with the ink. To realize this objective, the upper protective layer is arranged in an area including the heat application portion so that it can be electrically connected to serve as an electrode which causes an electrochemical reaction with the ink. The upper protective layer is formed of a material containing a metal which is dissolved by the electrochemical reaction and which does not form, on heating, an oxide film which hinders the dissolution. With this arrangement, a reliable electrochemical reaction can be produced to dissolve a surface layer of the upper protective layer, thereby removing kogations on the heat application portion reliably and uniformly.

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

Abstract: A liquid discharge head substrate includes an electrode layer, which is electrically connected to an element that generates energy used for discharging a liquid and provided in an inner side of a region between a first face and a third face of a substrate, and a member made of resin which covers the electrode is provided in the region.

Abstract: The present invention prevents an element substrate from not operating normally in the case where the voltage supply from a power supply that applies a voltage to a logic circuit is unstable. The element substrate of the invention has unit for applying a first voltage to the logic circuit, and unit capable of applying a second voltage that is lower than the first voltage and capable of operating the logic circuit.

Abstract: To provide a print head that simplifies the manufacture process of a print head and reduces the manufacturing cost while preventing the peeling-off between a substrate and a flow passage forming member in the print head, and a method of manufacturing the print head. In the print head of the present invention, a protective layer is formed in a flow passage forming member side portion in a heat generating portion 2. The protective layer 20 contains a noble metal. Then, in the flow passage forming member side portion in the protective layer 20, the surface thereof is made of an oxide of a noble metal except in a portion corresponding to the heat generating portion 2, while in the portion corresponding to the heat generating portion 2 on the flow passage forming member side in the protective layer 20, the surface thereof is made of the noble metal.

Abstract: A compact print head enabling high-quality, high-speed printing is provided. A liquid ejecting head includes: a substrate, having elements that generate energy used to eject liquid from ejection openings, and provided with a liquid supply port that communicates with a surface of the substrate having the elements and an opposite surface thereof; a member, provided above the surface of the substrate, and having walls of a liquid flow path that communicates with ejection openings and the supply port; an insulating layer, provided so as to cover the supply port, and provided with a plurality of through-holes; and a conducting layer electrically coupled to the elements, and provided within the insulating layer so as to be insulated with respect to the liquid.

Abstract: A liquid ejection head includes a liquid-ejection head substrate including an element, which generates thermal energy used for ejecting a liquid from an ejection port, and a protective layer, which covers at least the element, and in which first layers and second layers are alternately stacked; a flow passage member which defines a wall of a flow passage communicating with the ejection port; and a flow-passage electrode disposed in the flow passage.

Abstract: An element substrate capable of obtaining a high-quality printed image for a long period. The element substrate has a plurality of heaters, driving elements each of which is provided in correspondence with each of the plurality of heaters to selectively drive the plurality of heaters, an input terminal to receive a driving mode selection signal, and a block selection circuit which time-divisionally drives, in blocks of different timings, heaters in each of a plurality of groups each including a predetermined number of heaters and driving elements. The element substrate includes a logic circuit which time-divisionally drives the heaters in the group when the selection signal input from the input terminal is a signal for selecting a first driving mode, and simultaneously drives all heaters in the group when the selection signal is a signal for selecting a second driving mode.

Abstract: A print head formed in a simplified and less costly manufacture process can be effective in preventing the peeling-off between a substrate and a flow passage forming member. In the print head, a protective layer is formed between the flow passage forming member and a heat generating portion. The protective layer contains a noble metal. On a side of the flow passage forming member, the surface of the protective layer is made of an oxide of a noble metal, except in a portion corresponding to the heat generating portion, while in the portion corresponding to the heat generating portion on the flow passage forming member side, the surface thereof is made of the noble metal.

Abstract: In an ink jet head using a thermal energy for ejecting ink, this invention aims to reliably and uniformly remove kogations deposited on a heat application portion in contact with the ink. To realize this objective, the upper protective layer is arranged in an area including the heat application portion so that it can be electrically connected to serve as an electrode which causes an electrochemical reaction with the ink. The upper protective layer is formed of a material containing a metal which is dissolved by the electrochemical reaction and which does not form, on heating, an oxide film which hinders the dissolution. With this arrangement, a reliable electrochemical reaction can be produced to dissolve a surface layer of the upper protective layer, thereby removing kogations on the heat application portion reliably and uniformly.

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: In an ink jet head using a thermal energy for ejecting ink, this invention aims to reliably and uniformly remove kogations deposited on a heat application portion in contact with the ink. To realize this objective, the upper protective layer is arranged in an area including the heat application portion so that it can be electrically connected to serve as an electrode which causes an electrochemical reaction with the ink. The upper protective layer is formed of a material containing a metal which is dissolved by the electrochemical reaction and which does not form, on heating, an oxide film which hinders the dissolution. With this arrangement, a reliable electrochemical reaction can be produced to dissolve a surface layer of the upper protective layer, thereby removing kogations on the heat application portion reliably and uniformly.