Image-forming apparatus

Details Image-forming apparatus Image-forming apparatus

1997-09-26

2000-06-20

Moses, Richard

Electrophotography

Image formation

Transfer

399303, G03G 1514

Patent

active

060787724

ABSTRACT:
An image-forming apparatus is provided with: a photoconductor drum having a surface on which a toner image is formed, a transfer drum for transferring the toner image onto a copying material by allowing the copying material to contact the photoconductor drum, and a ground roller for electrostatically attracting the copying material onto the transfer drum prior to transferring the toner image onto the copying material. He transfer drum is constituted by a semi-conductive layer and a dielectric layer that are stacked on a conductive layer. [Supposing that] The nip width between the photoconductor drum and the transfer drum is L1, the rotation speed of the two drums is Vp, and the time constant, which is represented by a product of the resistance and the capacitance between the two drums, is .tau., the relationship represented by L1/Vp<.tau. is satisfied. By defining the time constant of the transfer drum [as described above], it becomes possible to stabilize an electric field made by the transfer drum, and consequently to carry out a desired transferring operation.

REFERENCES:
patent: 5390012 (1995-02-01), Miyashiro et al.

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