Photocopying – Contact printing – Light boxes
Patent
1990-05-01
1992-02-11
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355221, 355239, 361235, G03G 1502
Patent
active
050879448
ABSTRACT:
An equal voltage is applied to a corona shielding case and a screen grid, when a normal mode is set, while a switch is changed over to connect the shielding case to ground when a photo mode is set. Therefore, part of a discharge voltage from a corona discharger is grounded in the photo mode. It is therefore possible to make the surface potential of a photosensitive body in the photo mode in which the shielding case is grounded lower than that in the normal mode in which the shielding case of the corona discharger is placed at a potential corresponding to an output direct-current voltage of a high-tension transformer. As a result, half-tones of photographs can be reproduced effectively.
REFERENCES:
patent: Re30535 (1981-03-01), Kuroishi et al.
patent: T890003 (1971-09-01), Kaukeinen
patent: 3843906 (1974-10-01), Leibrecht
patent: 4086650 (1978-04-01), Davis et al.
patent: 4248518 (1981-02-01), Nishikawa
patent: 4251152 (1981-02-01), Miyakawa et al.
patent: 4491407 (1985-01-01), Mitsuyama et al.
patent: 4585320 (1986-04-01), Altavela et al.
European Search Report.
Patent Abstracts of Japan, vol. 5, No. 81; & JP-A-5629260.
Patent Abstracts of Japan, vol. 10, No. 264; & JP-A-6188283.
Grimley A. T.
Kabushiki Kaisha Toshiba
Ramirez Nestor R.
LandOfFree
Image forming apparatus with control means for the surface poten 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 with control means for the surface poten, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image forming apparatus with control means for the surface poten will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-784428