Developing apparatus for electrostatic photography
US4445771A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1981 |
| Grant date | May 1, 1984 |
| Priority date | — |
| Expiry date | Nov 30, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/0653
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A toner charging member to which a toner is conveyed and supplied is located in the vicinity of a photoconductive element which is to carry an electrostatic latent image thereon. The toner charging member charges the toner conveyed thereto to a selected polarity by friction, so that a thin uniformly charged toner layer is formed on the toner charging member. The charged toner particles are released from the toner layer on the charging member onto the latent image on the photoconductive element. The toner charging member has an insulating member on its surface. A first discharging means is provided to dissipate accumulated charge on the insulator substantially simultaneously with its operation for removing toner particles from the charging member those which were not been supplied to the latent image. A second discharging means is disposed in a position downstream of a station where the first means removes the residual toner and upstream of a station where the toner is supplied to the charging member, in order to remove the charge from the insulator. A number of microelectrodes are formed on the toner charging member or on its insulator to attain a prominent edge effect even when us…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.