Photocopying – Contact printing – Light boxes
Patent
1994-03-15
1996-07-02
Grimley, Arthur T.
Photocopying
Contact printing
Light boxes
118645, 118658, 355326R, G03G 1509
Patent
active
055328032
ABSTRACT:
A developing unit in use with an image forming apparatus such as a printer and a copier. The developing unit includes: a photoreceptor for holding a toner image; two-component developer consisting of toner and magnetic carrier; a developing sleeve, located in a vicinity of the photoreceptor and slightly separated from the photoreceptor, for supplying the toner of the two-component developer to the surface of the photoreceptor; a developer layer thickness regulator for regulating a layer thickness of the two-component developer provided on a rotatable surface member of the developing sleeve; and a developing bias generator for applying a developing bias voltage, including an AC component, onto the developing sleeve. The developing sleeve further including: the rotatable surface member for conveying the two-component developer; plural magnetic poles each of which is fixed at a respective predetermined location in the rotatable surface member. In the developing unit, layer thickness H.sub.D (mm) of the two-component developer and gap D.sub.SD (mm), between the surface of the photoreceptor and the rotatable surface member, both at the location where the rotatable surface member is closest to the surface of the photoreceptor, satisfies the equation of 0.02.ltoreq.D.sub.SD -H.sub.D .ltoreq.0.3; and the toner of the two-component developer is conveyed to the surface of the photoreceptor between 5 and 40 mg/cm.sup.2 at the location, where the rotatable surface member is closest to the surface of the photoreceptor.
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Takahashi Satoshi
Yasuda Kazuo
Grimley Arthur T.
Konica Corporation
Lee Shuk Y.
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