| 摘要 |
PURPOSE:To optimize printing characteristics by specifying the cross section, shape and material of a recording electrode in an electrode supplying a current to the toner chain being in contact with a magnetic electrode needle to obtain a developed image. CONSTITUTION:In the comb tooth-shaped electrode in an image recording head consisting of an insulating substrate 1 and recording electrode needles 2..., in order to obtain printing characteristics good in black density, fog density and the resolving power of main scanning and sub-scanning lines, the cross section of the electrode is set to 8000/nmum<2> or more, pref., 9600/nmum<2> regardless of an electrode material. In the shape of a magnetic electrode, the thickness thereof is set to 15mum or more, pref., 20mum or more and the width thereof is set to 720/nmum or less, pref., 600/nmum or less. The material quality thereof is composed of a material having high magnetic permeability characteristics such as Ni or an Ni alloy such as an Ni-Fe alloy or Ni-Co alloy. |
