Patent ID: 6942321

Claim:
A method for producing a liquid discharge head including a discharge energy generating element for generating energy for discharging a liquid droplet; an element substrate provided with said discharge energy generating element on a principal plane thereof; and an orifice substrate provided with a discharge port portion including a discharge port for discharging a liquid droplet, a bubble generating chamber for generating a bubble in a liquid therein by said discharge energy generating element, a nozzle including a supply path for supplying said bubble generating chamber with the liquid, and a supply chamber for supplying said nozzle with the liquid, and adjoined to the principal plane of said element substrate, the method comprising the steps of: coating, on the element substrate in which said discharge energy generating element is provided on the principal plane, a solvent-soluble thermally cross-linkable organic resin for forming a pattern of a first bubble generating chamber and a first flow path and heating the resin thereby forming a thermally cross-linked film; coating, on said thermally cross-linked film, a solvent-soluble organic resin for forming a pattern of a second bubble generating chamber and a second flow path; forming, in said organic resin, a second flow path pattern of a smaller height than in said second bubble generating chamber simultaneously with a pattern of said second bubble generating chamber, by employing a locally different exposure amount; laminating a negative-working organic resin layer on said thermally cross-linked film and said patterned organic resin and forming said discharge port portion in said negative-working organic resin layer; and removing said thermally cross-linked film and said patterned organic resin, wherein the pattern of the second flow path having a lower height than in said second bubble generating chamber is formed by an exposure of said organic resin, employing a slit mask having a slit pitch and then developing said organic resin.