Browse Prior Art Database

USE OF FLUX CHANNELING IN MAGNETIC IMAGING

IP.com Disclosure Number: IPCOM000023931D
Original Publication Date: 1979-Apr-30
Included in the Prior Art Database: 2004-Apr-01
Document File: 2 page(s) / 482K

Publishing Venue

Xerox Disclosure Journal

Abstract

In magnetic imaging, a latent magnetic image in the form of a pattern of closely spaced magnetic poles is permanently recorded in a layer of magnetic materiaL The latent image is made visible by pouring magnetic toner over the magnetic pattern. The toner adheres to the surface of the magnetic layer in the region of the magnetic pattern and does not adhere to the background areas that are not magnetized.

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XEROX DISCLOSURE JOURNAL

USE OF FLUX CHANNELING IN MAGNETIC IMAGING

F, Pond

Proposed Classification U~S.CL 346/74.1
Int. Cl. GOld 15/06

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FIG. 2

In magnetic imaging, a latent magnetic image in the form of a pattern of closely spaced magnetic poles is permanently recorded in a layer of magnetic materiaL The latent image is made visible by pouring magnetic toner over the magnetic pattern. The toner adheres to the surface of the magnetic layer in the region of the magnetic pattern and does not adhere to the background areas that are not magnetized.

The permanent nature of the latent magnetic image is one of the attractive features of magnetic imaging members. However, there are stages in a magnetic imaging process where it is helpful to temporarily "turn off" or significantly reduce the magnetic fields associated with the latent magnetic image without erasing the latent image. This non~destructive"turn off" can be achieved by channeling the flux into a region of high permeability. In other words, the "turn off" can be achieved by shunting the magnetic flux associated with a latent magnetic image into a layer brought adjacent to the magnetic recording member.

Figure 1 illustrates a recording member 10 having a latent magnetic image 11 permanently recorded on it. The member 10 is located in free space with the latent image made up of the north and south pole pairs, N and S, permanently recorded in the magnetic layer 12. Layer 13 is a commonly employed mechanical substrate for the magnetic layer. The magnet flux or field 14 associated with the latent image extends above and below the plane of the recording member.

FIG. I

Volume 4 Number 2 March/April 1979 245

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USE OF FLUX CHANNELING IN MAGNETIC IMAGING (Cont~d)

Figure 2 illustrates the recording member of Figure 1 after it is placed adjacent a shunt member 15. Member 15 has a high permeability compared to the magnetic layer...