Patent ID: 6409314
Filing Date: 2002-06-25
Classification: B41J,G03G

Abstract:
An image forming apparatus comprising:a developer carrying member for carrying at least a charged developer in an image formation region; a counter electrode which is disposed in opposing relation to the developer carrying member in the image formation region, supporting a recording member, and is applied with a predetermined voltage; an insulating base which is disposed between the developer carrying member and the counter electrode and has a plurality of openings; image signal electrodes which are provided around the respective openings in the insulating base in opposing relation to said developer carrying member, and impressed with an image signal for controlling the amount of developer supplied from the developer carrying member and passing through the openings being applied; and a control signal electrode which is provided on the insulating base in opposing relation to the counter electrode and is applied with a voltage always lower than the voltage applied to the image signal electrodes when a developer of negative polarity is used and is applied with a voltage always higher than the voltage applied to the image signal electrodes when a developer of positive polarity is used.