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 recording head substrate allowing an increased number of the exothermic bodies driven at a time without increasing the substrate size so as to increase a number of nozzles arranged in high density. The recording head substrate includes a plurality of electrothermal conversion members having exothermic bodies respectively corresponding to a plurality of discharge ports; a plurality of drive elements for driving the exothermic bodies; common wiring A connected to the exothermic bodies; and common wiring B connected to the drive elements; and an electrode pad connected to the common wiring A and the common wiring B. A number of the exothermic bodies driven at a time is determined by (RlineA+RlineB)/(Rh+Rd)<0.05/(0.95 n?1).

Abstract: In a case where first wirings (wirings for a driving power supply (VH)) commonly connected to a plurality of electro-thermal converting elements and adapted to supply an electric power to the plurality of electro-thermal converting elements and second wirings (high voltage grounding wirings (GNDH)) for connecting source areas of respective switching elements to grounding potential are provided, resistance of the second wiring is selected to be smaller than resistance of the first wiring.

Abstract: To drive an inkjet printhead having an array of printing elements, where the first and second printing elements which discharge relatively different amounts of ink are arranged on the same array in a predetermined direction, print data for the first or second printing element is serially inputted, the inputted print data is sequentially stored, the stored print data is latched, a selection signal indicative of which of the first or second printing element is to be driven is inputted, a driving signal indicative of a driving period is inputted, and respective printing elements are driven in accordance with the latched print data, the selection signal, and the driving signal. Accordingly, it is possible to reduce the cost of the printhead having plural types of printing elements, which discharge relatively different amounts of ink, and possible to easily control driving of the printhead.

Abstract: In a substrate for an ink jet head used for an ink jet head recording apparatus, electrostatic breakdown of a diode sensor functional as a substrate temperature sensing element is prevented. A protective element is electrically connected between a diode sensor and an input/output pad for the diode sensor.

Abstract: An ink jet recording head and an ink jet recording apparatus using the ink jet recording head are disclosed. The adhesion between a substrate and a discharge port forming member can be improved. In order to further reduce the size of the substrate by further optimizing the arrangement of an inspection pad, at least a recording element protecting section covers the upper part of a recording element row with a conductivity, and at least an electrical circuit element protecting section covers the upper part of an electrical circuit element row with a conductivity. An inspection electrode pad is electrically connectable with the recording element protecting section and the electrical circuit element protecting section.