Photocopying – Contact printing – Light boxes
Patent
1986-12-04
1989-06-20
Salce, Patrick R.
Photocopying
Contact printing
Light boxes
355326, 430 42, 430 45, G03G 1501
Patent
active
048413356
ABSTRACT:
A recording apparatus having an operation panel for selecting a first mode for recording a color image or a second mode for recording a monochromatic image, and for selecting a color for the monochromatic image-recording. When the first mode is selected, a charger electrically charges a photosensitive drum. A latent image is formed and developed on the drum by an image-forming/developing unit, thereby forming a color toner image. A bias electric field is applied between the drum and a developing roller, whereby the toner from the roller is attracted to the drum and does not return to the roller. The latent image can thus be developed without contacting the drum or the coller. The color toner image is transferred to a transfer sheet by a transfer charger. When the second mode is selected, the charger electrically charges the drum. A latent image is formed and developed on the drum by image-forming/developing unit, thus forming a monochromatic image. An A.C. electric field is applied between the drum and the roller. This electric field has an intensity great enough to, and a frequency high enough to cause the toner flown from the roller to move back and forth. The monochromatic image is transferred to a transfer sheet.
REFERENCES:
patent: 4165165 (1979-08-01), Iwami
patent: 4599285 (1986-07-01), Haneda et al.
Kabushiki Kaisha Toshiba
Salce Patrick R.
Todd Voeltz Emanuel
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