Hitachi, Ltd.

Hitachi Metals, Ltd.

Hitachi Koki

Sayoko Ohba

Kenji Okuna

Hidefumi Ohtsuka

Takaomi Nishigaito

Tsutomu Iimura

Katsumi Muroi

Ryoji Kojima

A method and an apparatus for recording an image is disclosed, in which toner is supplied between a conductive recording drum covered with an insulating material and recording electrodes with the forward end thereof with a small gap from the drum and inclined at a great angle upstream of the direction of rotation of the recording drum. A toner carriage force is generated in the toner to flow out downstream by rotation of the recording drum. A permanent magnet is arranged in the recording drum to form a toner chain inclined at a great angle downstream of the recording drum from the forward end of the recording electrodes. The component of the magnetic force of the magnet in the direction of drum movement is balanced with the toner carriage force. Upon application of a recording voltage to the recording electrodes under this condition, the toner of the most downstream toner chain in contact with the drum surface develops a force of adhesion to the recording drum so that the drum rotates downstream with the toner attached thereon, thus forming an image due to the toner on the recording drum.

Method and apparatus for image recording

Electromagnetic toner is supplied to the surface of the image development drum formed of a hollow aluminum covered with electric insulation; a permanent magnet is installed in the hollow portion of the image development drum; a recording electrode is provided on the surface side of the image development drum with a small gap formed between the drum surface and the electrode; a voltage is applied between the recording electrode and the image development drum according to the image to be recorded; the image development drum is turned to form a toner image on its surface; and the toner image formed on the drum surface is then transferred onto a recording sheet.

Electrographic recording apparatus

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Ibaraki, Japan

Sayoko Ohba