In a writing head for forming an electrostatic latent image on a cylindrical
image
carrier, a plurality of writing electrodes are arranged on a first face of a film
substrate in a first direction parallel with an axial direction of the image carrier.
The writing electrodes are adapted to be abutted against an outer periphery of
the image carrier to provide electric charges thereto. A first wiring member are
arranged on the first face of the film substrate to supply signals from a first
electrode driver to a first electrode group in the writing electrodes. A second
writing member are arranged on a second face of the film substrate to supply signals
from a second electrode driver to the second electrode group in the writing electrodes.