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High Resolution Magnetographic Printing Using Disposable Master

IP.com Disclosure Number: IPCOM000039856D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Dove, DB: AUTHOR [+3]

Abstract

Using a disposable magnetographic master tape eliminates the problem of toner contamination at the write station and thus facilitates high resolution magnetic printing with either an array head or a scanned head. The write processes in both magnetic printing and magnetic recording are very similar, and track recording densities in excess of 2000 per inch have been routinely achieved in the latter. However, this high resolution potential has not been achieved in magnetic printing because the requirements for writing high resolution latent images and toning them in the same environment are not compatible.

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High Resolution Magnetographic Printing Using Disposable Master

Using a disposable magnetographic master tape eliminates the problem of toner contamination at the write station and thus facilitates high resolution magnetic printing with either an array head or a scanned head. The write processes in both magnetic printing and magnetic recording are very similar, and track recording densities in excess of 2000 per inch have been routinely achieved in the latter. However, this high resolution potential has not been achieved in magnetic printing because the requirements for writing high resolution latent images and toning them in the same environment are not compatible. High resolution magnetic recording requires a very clean environment, so that the spacing between the recording head and recording medium can be controlled, and this is not compatible with toning, which is basically a very dirty process. Thus it appears that if high resolution magnetic printing is to be achieved, the writing and toning stations have to be isolated from each other. This isolation is accomplished by using a disposable magnetographic master. The disposable magnetographic master consists of a magnetic tape 1 coated with the thin aluminum layer 2 (<1000 angstroms), on which high resolution magnetic recording techniques are used to write the desired latent images. This aluminum layer serves later on as either a reflective layer or an etching layer, depending on the printing process chosen. The writing is accomplished by using a scanned head or a full width head 3. A scanned head would minimize the electronic circuitry, but it is more adaptable to use with a drum. A full width head is more adaptable for use with a disposable magnetic medium, such as tape (Fig. 1). For example, using an array-type head (32 X 250 elements), an 8" wide, 1000-pel per inch pr...