| 1. A producing method for a liquid discharge head including plural pressure generating chambers, plural nozzle apertures communicating
with the plural pressure generating chambers, respectively, through nozzle communicating paths, and a reservoir with which
the plural pressure generating chambers commonly communicate, the method comprising:
a step of applying an etching on one of two principal planes of a substrate, thereby forming the pressure generating chambers
and the nozzle communicating paths; and
a step of applying an etching on another of the two principal planes of the substrate, thereby forming the nozzle apertures
and the reservoir.
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