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 has the heaters formed with high precision to reduce their areas. It also has provisions to protect the electrode wires against corrosion and prevent a progress of corrosion. The substrate is deposited with the thin first electrodes made of a corrosion resistant metal. This is further deposited with the resistor layer. The second electrodes made of aluminum are deposited to overlap the first electrodes to form the heater without causing large dimensional variations among the heaters. With this construction, if a defect should occur in a protective layer on or near the heater, a progress of corrosion can effectively be prevented because the material of the resistor layer is more resistant to encroachment than aluminum and the first electrodes are corrosion resistant.

Abstract: For improving adhesion between a protective layer having a portion coming into contact with ink in a substrate for an ink jet head, and a resin layer thereby ensuring reliability in quality over a prolonged period, the invention provides a substrate for an ink jet head including a heat-generating resistor constituting a heat generating portion, an electrode wiring electrically connected with the heat-generating resistor and an upper protective layer provided on the heat-generating resistor and the electrode wiring across an insulating protective layer, wherein after forming an upper protective layer in which a Ta layer is laminated on a layer formed by a TaCr alloy, said Ta layer is selectively patterned and selectively removed so that the liquid flow path member is formed in a portion where the layer formed by said TaCr alloy is exposed by said removing.

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 has the heaters formed with high precision to reduce their areas. It also has provisions to protect the electrode wires against corrosion and prevent a progress of corrosion. The substrate is deposited with the thin first electrodes made of a corrosion resistant metal. This is further deposited with the resistor layer. The second electrodes made of aluminum are deposited to overlap the first electrodes to form the heater without causing large dimensional variations among the heaters. With this construction, if a defect should occur in a protective layer on or near the heater, a progress of corrosion can effectively be prevented because the material of the resistor layer is more resistant to encroachment than aluminum and the first electrodes are corrosion resistant.

Abstract: A number of steps is reduced by manufacturing an electrode pad connecting a liquid discharge head to an external wiring by the same step of a common wiring for supplying an electric power to a discharge energy generating portion. A number of manufacturing steps of a head is reduced by forming a substrate for a liquid discharge head having an electrode pad and a common wiring for supplying an electric power to a discharge energy as a metal film made of the same material as the electrode pad in accordance with a plating in a step of forming the common wiring of the metal film in accordance with a plating.

Abstract: A metallic slide fastener element in which an exposed portion outside of an element is finished uniformly with a high smoothness and the fixing strength to a fastener tape is intensified, and a method for effectively manufacturing the same element, wherein a metallic flat type wire rod is placed on a die and the flat type wire rod is punched out with a punch so as to produce a slide fastener element, and at this time, a mouth on a punch side of the die or a peripheral edge of the die is chamfered at a radius of 0.01 to 1.0 mm and a clearance between the punch and the die is set to 0 to 30 ?m, so that an element, which has a cut surface comprising a shear surface of 80% or more and a fracture surface of less than 20% and is suitable as a slide fastener to be attached to a high quality product, is obtained.

Abstract: An object of this invention is to provide a safe and reliable head substrate having a fuse ROM without increasing the substrate size. To achieve the object, a head substrate includes a plurality of printing elements for printing, first driving elements which drive the printing elements, a fuse ROM which stores information, a second driving element which drives the fuse ROM, input device for inputting a printing signal to cause the plurality of printing elements to print and a block selection signal to time-divisionally drive the printing elements, selective driving device for selectively driving the first driving elements on the basis of the input printing signal and block selection signal, a first pad which applies a first voltage to the fuse ROM to write information, and a second pad which applies a second voltage to read out the information from the fuse ROM.

Abstract: The present invention provides a substrate for ink jet including a heating resistor generating thermal energy for discharging an ink from an ink discharge port and an upper protective layer which is formed above the heating resistor and has a contacting surface with the ink. Furthermore, the upper protective layer is made of an amorphous alloy consisting of Ta and Cr in which the content of Ta is more than that of Cr. This constitution allows for the substrate excellent in cavitation resistance and corrosion resistance, and capable of high durability while having similar discharge performance to that of a conventional protective layer made of a Ta film. The present invention further provides an ink jet head comprising the above-mentioned substrate, and a manufacturing method thereof.

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: For providing a base member for liquid discharge head having internal surface of liquid flow path and discharge port, suppressed in swelling by liquid and having high precision and high reliability, the invention provides a base member 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, wherein a protective layer formed by a catalytic chemical vapor deposition is formed on a surface of the resin structure in which the liquid discharge port is opened.

Abstract: A number of steps is reduced by manufacturing an electrode pad connecting a liquid discharge head to an external wiring by the same step of a common wiring for supplying an electric power to a discharge energy generating portion. A number of manufacturing steps of a head is reduced by forming a substrate for a liquid discharge head having an electrode pad and a common wiring for supplying an electric power to a discharge energy as a metal film made of the same material as the electrode pad in accordance with a plating in a step of forming the common wiring of the metal film in accordance with a plating.

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: An ink supply port is opened in an Si substrate on which an ink discharge energy generating element is formed, by anisotropic etching, from a back surface opposite to a surface on which the ink discharge energy generating element is formed. When the anisotropic etching is effected, OSF (oxidation induced laminate defect) is remained on the back surface of the Si substrate with OSF density equal to or greater than 2×104 parts/cm2 and a length of OSF equal to or greater than 2 ?m.

Abstract: A number of steps is reduced by manufacturing an electrode pad connecting a liquid discharge head to an external wiring by the same step of a common wiring for supplying an electric power to a discharge energy generating portion. A number of manufacturing steps of a head is reduced by forming a substrate for a liquid discharge head having an electrode pad and a common wiring for supplying an electric power to a discharge energy as a metal film made of the same material as the electrode pad in accordance with a plating in a step of forming the common wiring of the metal film in accordance with a plating.

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: 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: An ink jet recording head includes a substrate provided with an energy generating element to generate energy used for discharging ink, a discharge port through which the ink is discharged, a supply port for supplying the ink, and an ink path formed on the substrate for making the discharge port and the supply port communicate with each other, wherein wall members forming the ink path are made of an inorganic material, and a space between adjacent ink paths is filled up by a metal layer.

Abstract: An ink jet recording method for ejecting ink using an ink jet head substrate provided with a heat generating resistor, which is coated with a protection film, wherein the ink is ejected by a pressure produced by generation of a bubble, the bubble being created by film boiling of the ink caused by the application of thermal energy to the ink through the protection 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 protection film, which is contacted to the ink, not higher than 560° C.

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: An object of this invention is to provide a safe and reliable head substrate having a fuse ROM without increasing the substrate size. To achieve the object, a head substrate includes a plurality of printing elements for printing, first driving elements which drive the printing elements, a fuse ROM which stores information, a second driving element which drives the fuse ROM, input means for inputting a printing signal to cause the plurality of printing elements to print and a block selection signal to time-divisionally drive the printing elements, selective driving means for selectively driving the first driving elements on the basis of the input printing signal and block selection signal, a first pad which applies a first voltage to the fuse ROM to write information, and a second pad which applies a second voltage to read out the information from the fuse ROM.

Abstract: The present invention reliably blows a fuse element to store with high reliability data that corresponds to whether or not the fuse element has been blown. For this purpose, 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 it reaches the maximum current.