| 摘要 |
PURPOSE:To permit control on temperatures by low power by improving rise-up of ink temperature and thermal conductivity characteristics by a method in which heating elements are provided to the surface of a body made of a material having good insulating and thermal conductivity characteristics, in which mechanical and fluidal resonance point is set near the exciting frequency being used, and a porous material is inserted into the liquid chamber of the body. CONSTITUTION:Ink pressurized by a pump 20 is supplied to a porous filter 23 inserted into the liquid chamber of a head body 22 through a tube 21. To heat up the head body 22 for eliminating variations in the temperature of ink, a metallized heating element 24 is provided on the surface of the head body and a temperature sensor 25 is set on the surface layer. Ink stream 29 is jetted from a nozzle 28 by excitation of a vibrator 26 by AC power source 27. In the head body, a mechanical and fluidal resonance point is set near exciting frequency being used. A porous filter 23 is inserted into the liquid chamber of the head body to reduce the central flow speed of the ink, and thereby the temperature rise efficiency of ink is raised and control accuracy of temperatures by lower power is enhanced. |
