Ink jet system

摘要

In an ink jet system, first and second main electrodes are arranged on an insulating substrate board so as to be extended to one side of the board and connected to first and second auxiliary electrodes through photoconductive sections, respectively. An ink reservoir is formed on the board and an optical system is located above the photoconductive sections. First and second control electrodes are arranged along the one side of the board in an ink jet port of the reservoir so as to face the main electrodes. A back electrode is arranged as to face the ink jet port. First and second control pulse signals synchronized with each other and having pulse and negative polarities are supplied to the first and second control electrodes, first and second high voltage pulse signals synchronized with each other and having pulse and negative polarities are also supplied to the first and second auxiliary electrodes and another high voltage signal having a twice cycle period as that of the control pulse signal is supplied to the back electrode. The potentials on the main electrodes are varied according to the resistance of the photoconductive sections and an ink is jetted from the port to the back electrode when a predetermined potential difference between the main electrode and the back electrode is produced.