Detachable developing device for providing first and second volt

Details Detachable developing device for providing first and second volt Detachable developing device for providing first and second volt

1996-03-06

1998-06-02

Lee, Shuk

Electrophotography

Image formation

Development

G03G 1508

Patent

active

057615896

ABSTRACT:
A developing device attachable to and detachable from a printer using a non-magnetic monocomponent developer. Two different voltages are applied respectively to a developing roller and a toner layer thickness regulating device from a power source of the apparatus main body side through a terminal and a contacting spring. A voltage is applied directly to the developing roller from the contacting spring whereas a Zener diode is provided in a path connecting the contacting spring and toner layer thickness regulating device to apply another voltage to the toner layer thickness regulating device. The voltage applied to the toner layer thickness regulating device is dropped below the power supply voltage by the Zener voltage when a low-printing-ratio image is produced. Thus, the number of the terminals connecting the apparatus main body and developing device is reduced to one. Accordingly, defective connections at the contacting portions of the terminal can be prevented and the manufacturing costs can be reduced while a satisfactory image is produced.

REFERENCES:
patent: 4286543 (1981-09-01), Ohnuma et al.
patent: 4537491 (1985-08-01), Komada et al.
patent: 4755847 (1988-07-01), Matsuhiro et al.
patent: 5012285 (1991-04-01), Oka et al.
patent: 5634182 (1997-05-01), Asanae et al.

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