Developing apparatus using one-component toner

Details Developing apparatus using one-component toner Developing apparatus using one-component toner

1999-02-23

2000-11-28

Lee, Susan S. Y.

Electrophotography

Image formation

Development

399284, G03G 1508

Patent

active

061546275

ABSTRACT:
An object of the present invention is to prevent an electrical breakdown of a toner layer and an occurrence of overcurrent, thereby preventing quality of image from being degraded at the time of development, when development with one-component toner is conducted using a developing roller of low resistance. The resistance value Rd of a developing roller which carries and conveys one-component toner in a manner of coming into contact with a photoconductor which bears an electrostatic latent image, is defined as Rd=.rho.d.multidot.(Dd1/S1), wherein S1 (cm.sup.2) is an area in which the developing roller comes into contact with the static image bearing member via a toner layer, Dd1 (cm) is a layer thickness of a semiconductive layer which composes the developing roller, and .rho.d (.OMEGA..multidot.cm) is a volume resistivity thereof. The range of the resistance Rd is set as 10.sup.4 <Rd<10.sup.5 and the resistance Rt (.OMEGA.) of the toner layer is set as Rt>5.times.10.sup.7. By using the developing roller of low resistance, excellent development is realized and an electrical breakdown and an overcurrent can be avoided by the resistance value of the toner layer.

REFERENCES:
patent: 4564285 (1986-01-01), Yasuda et al.
patent: 4958193 (1990-09-01), Nojima et al.
patent: 5369478 (1994-11-01), Kobayashi et al.
patent: 5870658 (1999-02-01), Goto et al.
patent: 5893014 (1999-04-01), Goto et al.

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