Patent ID: 7261393

Claim:
A liquid jetting head comprising: heating elements for heating a liquid held in a liquid chamber; a first plurality of semiconductor devices for driving said heating elements; and a second plurality of semiconductor devices for controlling said first plurality of semiconductor devices, wherein, said heating elements, said first plurality of semiconductor devices and said second plurality of semiconductor devices are integrally formed on a substrate, said first plurality of semiconductor devices and said second plurality of semiconductor devices formed in regions separated from each other by thermal film regions, said thermal film regions are formed in the forming regions of said heating elements to accumulate heat of said heating elements for improved heating of said liquid, and a droplet of said liquid is jetted from a predetermined nozzle by driving said heating element by said semiconductor, and a part of an inter-layer insulation film disposed on said first plurality of semiconductor devices and said second plurality of semiconductor devices is formed of a coating type insulation film, and said coating type insulation film is formed by repeating, at least a plurality of times, a treatment for building up a coating type insulating material film by application to the surface of said substrate, and a treatment for substantially removing said coating type insulating material film in said heating element forming region by etching the surface of said substrate.