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Magnetic Brush Developer for Achieving a More Uniform Magnetic Field Strength Across Extended Areas

IP.com Disclosure Number: IPCOM000094042D
Original Publication Date: 1966-May-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 70K

Publishing Venue

IBM

Related People

Cross, RG: AUTHOR [+2]

Abstract

A uniform magnetic field over an arcuate area, as required in a cylindrical magnetic brush developer, is difficult to obtain.

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Magnetic Brush Developer for Achieving a More Uniform Magnetic Field Strength Across Extended Areas

A uniform magnetic field over an arcuate area, as required in a cylindrical magnetic brush developer, is difficult to obtain.

A magnetic brush developer with a uniform magnetic field is shown which includes a ferromagnetic inner cylinder supporting on part of its arcuate surface several rows of bar magnets. Each row extends in a longitudinal direction parallel to the axis of rotation of the cylinder and the magnets of a row abut. The magnets are polarized in the same direction along lines normal to the axis of rotation of the cylinder. A plurality of spaced ferromagnetic rods is spaced parallel to the axis of rotation of the cylinder to produce a uniform field along the rows of magnets.

To bridge the gap between the rows, a ferromagnetic helix is placed between each row and along the outer edges of the two outside rows. These helices provide flux return paths for the bar magnets and aid in producing a more uniform field between the rows of magnets.

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