Electro-thermal conversion device board, ink-jet recording head provided with the electro-thermal conversion device board, ink-jet recording apparatus using the same, and production method of ink-jet recording head

摘要

Beneath electro-thermal conversion device layers (121) having heaters (122 and 132), a common electrode layer (134) electrically connected to heaters (122 and 132) through branch connection parts (134A) is laminated through a protective film (126), and discrete electrodes (124 and 136) are formed on an upper surface of the electro-thermal conversion device layers (121) putting the branch connection parts (134A) between, respectively.