Olympus Optical Company, Ltd.

Tadahiro Yasuda

Masaji Nishikawa

Yoshiro Suzuki

Norio Amemiya

Shigeru Nakayama

Eiichi Sato

Takashi Matsuyama

Tadashi Aoki

In a transfer roller for use in a retention type copying machine, a semiconductive transfer roller is connected through a current limiting resistor having a high resistance value of 100 M.OMEGA. to 1000 M.OMEGA. to a transferring bias voltage source. A pair of auxiliary transfer rollers made of conductive material are arranged on respective sides of the transfer roller. The auxiliary transfer rollers are connected to the transferring bias voltage source through a potentiometer. To the transfer roller is applied a first transferring bias voltage of 600 to 900 volts and to the auxiliary transfer rollers is applied a second transferring bias voltage of 400 to 650 volts. When a resistance of a record paper is decreased due to high humidity, the first transferring bias voltage is automatically decreased and the second transferring bias voltage becomes predominant.

Transfer device for use in retention type electrophotographic copying

A transfer unit includes a pair of guide and field stabilizer members disposed adjacent to a transfer member and along a conveying path for a transfer sheet. A voltage is applied to the stabilizer members which is of the same polarity as a bias voltage applied to the transfer member. It is assured that transfer sheet reliably contacts the pair of field stabilizer members as it passes therebetween.

Transfer unit for electrophotographic copying machine

An electrophotographic sensitizing screen having a great number of apertures, wherein at least an insulating layer and a conductive layer are successively formed on a conductive mesh, is disclosed. These apertures are regularly arranged at such an angle as not to produce moire fringes with respect to a light image projected on the screen.

Electrophotographic sensitizing screen with peripherally clogged

Electrophotographic sensitizing screen

A device for developing a latent image produced on a record sheet by an effect of electrostatic charge by charged particles dispersed in a developer solution is disclosed. The device comprises a tank containing the developer solution and at least one pair of opposed rollers immersed in said developer solution at an intermediate region of said tank, said opposed rollers being passed by the record sheet therebetween and arranged closely adjacent to the record sheet.

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Hachioji, Japan

Tadahiro Yasuda