Browse Prior Art Database

Tangential Field Production in Electrophotographic Developers

IP.com Disclosure Number: IPCOM000041461D
Original Publication Date: 1984-Jan-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Bernardelli, WJ: AUTHOR [+3]

Abstract

This article relates to the production of tangential magnetic fields in the post-development zone of magnetic brush developers for use in an electrophotographic process. A permanent magnet is located in the post development zone to provide the necessary tangential field strength with the result that carrier bead loss is significantly reduced over previous configurations. Fig. 1 shows a rotating brush shell 10 with a develop magnet 11 positioned within rotating shell 10 relative to the photoconductor (PC) surface to provide a strong radial field at the development zone. A throw-off magnet 12 is located approximately 90o from magnet 11 so that a strong field tangential to the surface of shell 10 is present along the surface in the post-development zone. Fig.

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Tangential Field Production in Electrophotographic Developers

This article relates to the production of tangential magnetic fields in the post- development zone of magnetic brush developers for use in an electrophotographic process. A permanent magnet is located in the post development zone to provide the necessary tangential field strength with the result that carrier bead loss is significantly reduced over previous configurations. Fig. 1 shows a rotating brush shell 10 with a develop magnet 11 positioned within rotating shell 10 relative to the photoconductor (PC) surface to provide a strong radial field at the development zone. A throw-off magnet 12 is located approximately 90o from magnet 11 so that a strong field tangential to the surface of shell 10 is present along the surface in the post-development zone. Fig. 2 shows the plot of radial and tangential flux through rotation of shell 10; the development zone is located at approximately 90 to 115 degrees while the post- development zone is generally 115-145 degrees. Previous configurations had placed a strong radial field in the post-development zone in order to hold carrier beads in place to prevent bead carryout. The previous design, however, neglects the region between the development and post-development radial fields in which the radial fields collapse causing a significant centrifugal force on the outer carrier beads as they attempt to assume a position along the shell surface in the narrow area betwee...