Photocopying – Contact printing – Light boxes
Patent
1991-08-30
1993-08-24
Grimley, A. T.
Photocopying
Contact printing
Light boxes
118651, G03G 1506
Patent
active
052393445
ABSTRACT:
A method and apparatus for developing a latent image electrostatically formed on an image carrier by a developer carried on a developer carrier in a developing region where the image carrier and the developer carrier are located face-to-face. A great number of electric fields are produced on the surface of the developer carrier. An electric field is produced by a voltage applying device in the developing region. The movement of the developer is controlled by an electric field determined by the relationship between a potential deposited on the image carrier, a potential deposited on the developer carrier, and the electric field produced by the voltage applying device. A large number of first and second areas are formed on the surface of the developer carrier such that the first areas are charged to a predetermined potential and the second areas as set at a potential which is lower than the predetermined potential of the first areas in order to generate different level electric fields in the first and second areas. With this arrangement, higher quality images having constant density are formed as a well-balanced charging/discharging condition is developed between the toner and the toner supply roller of the device.
REFERENCES:
patent: 3203394 (1965-08-01), Hope et al.
patent: 3759222 (1973-09-01), Maksymiak et al.
patent: 3865080 (1975-02-01), Hudsun
patent: 4114261 (1978-09-01), Weiler
patent: 4289837 (1981-09-01), Gundlach
patent: 4395476 (1983-07-01), Kanbe et al.
patent: 4515106 (1985-05-01), Kohyama
patent: 4564285 (1986-01-01), Yasuda et al.
patent: 4576463 (1986-03-01), Sakamoto et al.
patent: 4656964 (1987-04-01), Kanno et al.
patent: 4696255 (1987-09-01), Yano et al.
patent: 4788570 (1988-11-01), Ogata et al.
patent: 4806992 (1989-02-01), Yasuda et al.
patent: 4873940 (1989-10-01), Ishikawa et al.
patent: 4930438 (1990-06-01), Demizu et al.
patent: 4982692 (1991-01-01), Uematsu
Society of Photographic Scientists and Engineers, Oct. 1973, pp. 62-65, P. G. Andrus et al., "Microfield Donors for Touchdown Development".
Enoki Shigekazu
Iwata Naoki
Suzuki Koji
Tomita Junko
Ueno Yuichi
Grimley A. T.
Ramirez Nestor R.
Ricoh & Company, Ltd.
LandOfFree
Developing roller having insulating and conductive areas does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Developing roller having insulating and conductive areas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Developing roller having insulating and conductive areas will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-832677