Patent ID: 6997546
Filing Date: 2006-02-14
Classification: B41J

Abstract:
1. A base plate of an ink jet recording head for printing by discharging ink onto a recording medium comprising: an energy converting element for discharging the ink by generating a bubble in the ink by converting electric energy to thermal energy; an anti-cavitation film to protect said energy converting element; a wiring for electrically connecting said anti-cavitation film to a bonding pad; an insulated protection film provided between said anti-cavitation film and said energy converting element; a first diode having a cathode thereof electrically connected to said wiring and an anode thereof connected to a ground potential; a second diode having an anode thereof connected to said wiring and a cathode thereof electrically connected to a power supply potential; and a resistance formed between said wiring and said power supply potential, wherein said anti-cavitation film is used as an electrode for detecting the state of the ink by energizing the ink and a voltage is applied to said anti-cavitation film to detect whether an electrical insulation is made between said energy converting element and said anti-cavitation film.