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MAGNETIC IMAGE BUFFER

IP.com Disclosure Number: IPCOM000022866D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 240K

Publishing Venue

Xerox Disclosure Journal

Abstract

A semi-permanentmagnetic image storage member is il1ustrated in figure 1 as having a support web 2 on which is over- coated a magnetizable layer 4. A magnetic latent image is stored in the layer 4 by writing alternating regions of positive and negative gradients of magnetization in an image configuration. The latent image? indicated by the arrows? is developed by a ferrofluid and the carrier liquid removed, The toner particles of the ferrofluid form piles or corrugations 6 at the magnetic field interfaces with the layer 4 to produce a diffraction grating image with a frequency twice that of the latent magnetic image. The diffraction efficiency of the grating image is then increased to nearly 100% by the addition of a reflective overcoating 8,

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 94% of the total text.

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XEROX DISCLOSURE JOURNAL

~~i$jm~Buff~ Proposed Classification
E. C, Faucz U.S. Cl. 350/266
S. F. Pond mt. Ci, G05d 25/00

PIG.!

f2

SOURCE

p~ semi~permanentmagnetic image storage member is il1ustra-~
ted in figure 1 as having a support web 2 on which is over-U
coated a magnetizable layer 4,

~ magnetic latent image is stored in the layer 4 by writing
alternating regions of positive and negative gradients of
magnetization in an image configuration. The latent image?
indicated by the arrows? is developed by a ferrofluid and
the carrier liquid removed, The toner particles of the
ferrofluid form piles or corrugations 6 at the magnetic
field interfaces with the layer 4 to produce a diffraction
grating image with a frequency twice that of the latent
magnetic image. The diffraction efficiency of the grating
image is then increased to nearly 100% by the addition
of a reflective overcoating 8,

In figure 2? the semi~permanentgrating image 10 thus
formed is read out by oblique reflection optics including
a source 12 and a detector 14. The grating image 10 can
be stored indefinitely in its illustrated form or the

DETECTOR

FIG. 2

Volume 1 Number 3 March 1976

[This page contains 1 picture or other non-text object]

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MAGNETIC IMAGE BUFFER (Cont~d)

image cleaned from the surface of the magnetizable layer 4

to permit recording in a different pattern.

The magnetic image buffer is useful in the facile storage,
retrieval, reproduction and display of graphics or text
on magnetizable surfaces,

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