Patent ID: 6092886
Filing Date: 2000-07-25
Classification: B41J

Abstract:
An ink jet recording apparatus comprising:an ink jet recording head, having:a nozzle opening,pressure producing chamber having a Helmholtz resonance frequency and communicating with said nozzle opening, said Helmholtz resonance frequency being at least 70 and less than 100 KHz,an ink supply port communicating with said pressure producing chamber and with a common ink chamber, anda piezoelectric vibrator, which has a natural vibration cycle Ta, for expanding and contracting said pressure producing chamber; andmeans for generating a drive signal, said drive signal generating means outputting a first signal for expanding said pressure producing chamber, a second signal for keeping said pressure producing chamber expanded, and a third signal for jetting an ink droplet out of said nozzle opening by contracting said expanded pressure producing chamber;wherein a duration Pwh of said second signal is:0.7.times.Ta(n+1/2).ltoreq.Pwh.ltoreq.1.3.times.Ta(n+1/2),where n is an integer.