Dispositif de formation d'images

Image-forming device


An image-forming device for recording images on a dielectric surface (41) of an image-recording medium (10), in which the dielectric surface (41) is in contact, in an image-forming zone (90), with developing powder bound to a powder support (84) by a magnet system (87). The magnet system (87) comprises two oppositely magnetised areas (85, 88) separated by a gap and, as considered in the direction of transport of the image-recording medium (10), disposed consecutively. The distance between at least one of the magnetised areas (85, 88) and the surface of the powder support (84) is less than 150 µm and the distance between the same magnetised area (85, 88) and the surface of the image-recording medium (10) is less than 600 µm. This raises the background-free level while less magnetic material is required for the magnet system (87) than in comparable prior-art devices.




Download Full PDF Version (Non-Commercial Use)

Patent Citations (3)

    Publication numberPublication dateAssigneeTitle
    EP-0304983-A1March 01, 1989Océ-Nederland B.V.A printing device having a magnetic roller comprising a stationary ferromagnetic knife blade enclosed between like magnetic poles
    US-4062321-ADecember 13, 1977Sperry Rand CorporationFluid supported belt about cylindrical mandrel for transporting magnetic particles
    US-4354454-AOctober 19, 1982Olympus Optical Company LimitedDeveloping device with magnetic pole having magnetic spacer members

NO-Patent Citations (0)


Cited By (3)

    Publication numberPublication dateAssigneeTitle
    EP-0718721-A1June 26, 1996Océ-Nederland B.V.Method of recording images, and an image-forming device for application of the method
    EP-0773484-A1May 14, 1997Océ-Nederland B.V.Magnet system for an image-forming apparatus
    US-5812921-ASeptember 22, 1998Oce-Nederland, B.V.Magnet system for an image-forming apparatus