Photocopying – Contact printing – Light boxes
Patent
1992-03-09
1993-05-25
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355208, 355214, G03G 2100
Patent
active
052144771
ABSTRACT:
An image forming apparatus comprises a photoreceptor, a developing roller for forming a layer of developer on a surface thereof to supply toner to the photoreceptor at a developing position, a bias supply for applying bias voltage between the developing roller and a ground, a conductive line for electrically connecting the developer layer with the ground, a detector for detecting toner density of the developer layer based on an amount of electric current flowing through the conductive line, and a voltage controller for preventing surface voltage of the developer layer from falling below a predetermined level despite the electric current flowing into the conductive line at least during a developing operation. Accordingly, there can be reliably prevented formation of fog on a copy because the surface voltage of the developer layer is maintained above the specified level at least during the developing operation.
REFERENCES:
patent: 3932034 (1976-01-01), Takahashi
patent: 4089297 (1978-05-01), Morita et al.
patent: 4395112 (1983-07-01), Miyakawa et al.
patent: 4538897 (1985-09-01), Osaka et al.
Akashi Masakatsu
Hirobe Junichi
Kobayashi Masahiko
Sugaya Tsutomu
Grimley A. T.
Mita Industrial Co. Ltd.
Royer William J.
LandOfFree
Image forming apparatus having a toner density detecting device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Image forming apparatus having a toner density detecting device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image forming apparatus having a toner density detecting device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-901190