METHOD,MEANS,AND APPARATUS FOR CONTROLLING ELECTRODE IN PRINTER UNIT,MEANS AND APPARATUS FOR SUPPLYING POWER IN ABOVE APPARATUS,AND PRINTER EQUIPPED WITH ABOVE MEANS OR APPARATUS FOR SUPPLYING POWER

摘要

PROBLEM TO BE SOLVED: To make a printer unit compact by setting respective drive means of electrodes permitting toner particles to pass to a high resistance state while setting the drive means of electrodes obstructing the passage of toner particles to a low resistance state and connecting the respective electrodes connected to the drive means set to the high resistance state to necessary ON potential to obtain drive means capable of being mounted on a carrier. SOLUTION: An electrode means having apertures at least partially surrounded by electrodes and at least one rear electrode 12 are provided to a toner carrier 10. Toner particles are passed from apertures by setting the electrode means to ON-potential by a drive circuit 19c and prevented from passing toward the rear electrode 12 through the apertures by setting the same to OFF-potential. The drain of a transistor 20 is connected to a ring electrode 16 through a conductor 24 and the conductor 24 is made excitable by a control capacitor 33. When voltage is applied to the ring electrode 16 by the drive circuit 19c, a printing state is obtained.