Nippon Steel Corporation

Tetsuo Itagaki

Naoya Matsuda

Takashi Horikawa

Dennis Kauffman

There is provided an electrostatic recording head capable of moderating variable density striations generated on a recording blank form. In an applied voltage regulating unit, a closed circuit is formed by connecting a regulator (42), a resistor (32), a diode (34) and a resistance (R.sub.1) and a transistor (T.sub.1) provided in a driving circuit (16 or 18) in series in one needle electrode (12). Here, a cathode side of the diode (34) is connected to the needle electrode (12), and another end of the regulator (42) is connected to the driving circuit (16 or 18). A regulated voltage determining means (44) determines the voltage to be applied to each needle electrode (12) in accordance with the picture image density detected by a picture image density detecting unit (46) and the humidity detected by a humidity sensor (48), and regulates a voltage value of a regulator (42) based on the determined voltage. Thus, the voltage applied to the needle electrode (12) can be regulated by applying an electric current to the circuit and dropping the voltage with resistance 32 and resistance R.sub.1.

Electrostatic recording head providing voltage regulation to voltage

An electrostatic recording head used for forming an electrostatic latent image of an image to be recorded on a recording medium comprises a plurality of electrode groups, each group including a plurality of needle-like electrodes. The needle-like electrodes of all the groups are arranged linearly in at least one line. A plurality of auxiliary electrodes are disposed such that each of the electrode groups faces at least one of the auxiliary electrodes. An auxiliary electrode driving unit drives the auxiliary electrodes independently of each other. Each of the electrode groups is divided into a plurality of subgroups, each subgroup including at least one of the needle-like electrodes. A subgroup driving unit is provided for each of the subgroups for driving the subgroups independently of each other. A control circuit controls the subgroup driving unit and the auxiliary electrode driving unit so that the subgroups belonging to one of the electrode groups are driven in such an order that a plurality of subgroups which are not adjacent to each other are simultaneously driven, while at least one of the auxiliary electrodes facing the one electrode group is driven during at least a time interval when any one of the subgroups is driven.

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Sagamihara, Japan

Tetsuo Itagaki