An image forming apparatus for use in a printer for computers and the like includes an image forming head (7) between a developing sleeve (2) and an opposing electrode. (6). Control electrodes (19) are provided around respective openings (16) of the head (7), so that the openings (16) are electrostatically opened and closed by controlling a voltage applied to the respective control electrodes (19). In order to prevent the openings (16) of the head (7) from being clogged with toner (5), the percentage of the area of the opening (16) to the sum of the area of the extent of the control electrode (19) around the opening (16) and the area of the opening (16) is set to 8% or more.

Una imagen que forma el aparato para el uso en una impresora para las computadoras y los similares incluye una imagen que forma la cabeza (7) entre una manga que se convierte (2) y un electrodo de oposición. (6). Los electrodos del control (19) se proporcionan alrededor de aberturas respectivas (16) de el (7) principal, de modo que las aberturas (16) sean abiertas y cerradas electrostático controlando un voltaje aplicado a los electrodos respectivos del control (19). Para evitar que las aberturas (16) de el (7) principal sean estorbadas con el toner (5), el porcentaje del área de la abertura (16) a la suma del área del grado del electrodo del control (19) alrededor de la abertura (16) y del área de la abertura (16) se fija hasta el 8% o más.

 
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