| 摘要 |
PURPOSE:To form dichroic picture by controlling a toner with dichroic reversed- polarity charges and the polarity of an accelerating electric field in the device which shapes an electric field in an opening, controls passage through the opening of charged particles and obtains the picture. CONSTITUTION:When AC voltage is applied between a base electrode 3 and a toner carrying member 7 from an AC power supply 10, the positive polarity toner 8 and the negative polarity toner 9 are reciprocated alternately between the carrying member 7 and the base electrode 3. When plus signal voltage is applied to a signal electrode 1 from a signal power supply 12, working passing through the opening 4 functions to the black negative toner 8 because the recording member side is brought to higher potential in the opening 4, and the black toner reaches the recording member 5 and the black picture is formed when the back electrode 6 side is brought to positive potential at potential from an AC power supply 11. The red positive toner 9, on the contrary, reaches the recording member 5 when the signal electrode 1 is brought to minus voltage and the back electrode 6 to the negative side, and the red picture is shaped. |
