| 摘要 |
PURPOSE:To maintain stabilized characteristics of liquid drop formation of an initial stage for a long time by establishing a surface roughness of the portion, at least, in which a liquid flow path in a substrate is provided as Ra<=0.1mum where an average roughness of the centerline according to Japanese Industrial Standard is Ra. CONSTITUTION:Pertaining to a liquid jet recording head of the type in which liquid drips are formed and discharged by an electrothermal converter 4, by maintaining the surface smoothness of a substrate below 0.1mum when an average roughness is Ra by the indication as defined by JIS (Japanese Industrial Standard), an overall durability is enhanced and yield rate of production is improved. The portion in which the surface roughness Ra is maintained below 0.1mum may be the whole surface area of the substrate, but the portions that are necessary for durability and production process are the areas under electrodes 12,13 or a heat generating resistor layers 11 that have a probability of contacting the liquid, and for the practical purposes it is sufficient enough to keep the surface smooth where there are concerned with the liquid such as a liquid chamber, liquid flow path, etc. |
