Patent ID: 7475966

Claim:
A liquid discharge recording head including a discharge port for discharging liquid and a flow path for supplying the liquid to the discharge port, comprising: a silicon substrate including a discharge energy generating element provided in correspondence to the discharge port and adapted to generate energy for discharging the liquid and an electric circuit for driving the discharge energy generating element; and a nozzle plate stacked on a front surface of said silicon substrate and adapted to form a flow path and made of inorganic material, wherein a recessed portion having a predetermined depth is formed in a region of the front surface of said silicone substrate, where said flow path is provided, and said discharge port is formed above said recessed portion, and one or more layers are stacked on or above the discharge energy generating element, and, where a distance between a front surface of an uppermost layer among the one or more layers and a bottom surface of the recessed portion is B, a distance between the bottom surface of the recessed portion and a front surface of said nozzle plate is A and a shortest distance between the front surface of the uppermost layer and a ceiling of the flow path is C, relationships A/2≦B+C and B≧C are established.