Magnetic toner transfer apparatus
US4411512A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 26, 1982 |
| Grant date | Oct 25, 1983 |
| Priority date | — |
| Expiry date | May 26, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G19/00
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus for transferring toner magnetically adhering to magnetic images stored in a magnet image-storage medium to a toner-adherable receiving medium such as paper. Included is a platen which presses the paper against the storage medium to form regions of contact and noncontact between the paper and storage medium. A boundary between the two regions is defined by a line of contact. The apparatus also includes magnets for producing a magnetic field in the paper and storage medium which is asymetrical with respect to the line of contact. The field is stronger in the region of noncontact than in the region of contact. In the preferred embodiment, the field originates from a pair of spaced-apart, confronting magnetic poles disposed on a side of the paper opposite from the storage medium. The apparatus is structured to produce selectively a field in the storage medium having a magnetizing force less than or, alternatively, greater than, the coercivity of the storage medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.