PURPOSE: To obtain a stable printing head by making the resonant frequency at a low temperature coincident with the frequency to be used in an inkjet recorder, thereby minimizing variation of droplet characteristics with temperature change.
CONSTITUTION: The printing head in an inkjet recorder is to cut an ink column injecting from a nozzle by oscillating a vibration element of deform a liquid chamber thereby generating pressure waves in the ink. In the printing head, the sonic speed in the liquid increases as the temperature rises so that resonant frequency increases with the temperature. The length of the liquid chamber is so determined that the resonant frequency coincides with the used frequency at the lowest ambient temperature such as 5°C to create a resonant state. The printing head constructed as above deviates from the resonant frequency and so becomes inefficient at higher temperatures, for example, 25°C. However, this is compensated for by some increase in efficiency becuase of lower viscosity at high temperatures. Thus, the relative efficiency is kept stable, enabling a stable injection over wider temperature ranges.
| WO/2009/004280 | A METHOD OF CONTINUOUS INK JET PRINTING |
| JPS6477549 | ULTRASONIC WAVE ABSORBING APPARATUS OF INK JET PRINTING HEAD |
| JPS6270050 | PRINTING HEAD OF PRINTER |
KAKEFU SADAO
FURUKAWA ISOKAZU
OOHORI TAMIO
UMEZAWA MICHIO
NARUSE OSAMU
