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THERMAL RECORDING OF MAGNETIC TAPE WITH AN ELECTROMAGNET

IP.com Disclosure Number: IPCOM000025323D
Original Publication Date: 1984-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 90K

Publishing Venue

Xerox Disclosure Journal

Abstract

Alternate embodiments of an improved thermoremanent magnetic imaging system 10 is shown in Figures 1 and 2. In Figure 1, a magnetic tape 12 moves in direction of arrow 14 and over rotatable pressure roller 16. The pressure roller rotates in the direction of arrow 24 and forms a nip 18 with a thermal printhead 20, which may be a standard commercially available printhead. The magnetic recordine surface 28 confronts the thermal printhead and is maintained in intimate contact with the thermal elements 22 thereof by the urging of the pressure roller on the tape, as it moves through the nip. Electromagnet 30 driven by AC driver 32 places the magnetic latent image on the tape surface 28 in a line-by-line fashion in accordance with digitized data signals from a character generated, microprocessor, raster input scanner or the like (not shown).

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THERMAL QECORDING OF MAGNETIC TAPE WITH AN ELECTROMAGNET Almon P. Fisher

Proposed Classification
U.S. (31. 430/39 Int. C1. G03g 19/00

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38

Volume 9 Number 4 July/August 1984 29 1

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

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THERMAL RECORDING OF MAGNETIC TAPE WITH AN ELECTROMAGNET (Cont'd)

Alternate embodiments of an improved thermoremanent magnetic imaging system 10 is shown in Figures 1 and 2. In Figure 1, a magnetic tape 12 moves in direction of arrow 14 and over rotatable pressure roller 16. The pressure roller rotates in the direction of arrow 24 and forms a nip 18 with a thermal printhead 20, which may be a standard commercially available printhead. The magnetic recordine surface 28 confronts the thermal printhead and is maintained in intimate contact with the thermal elements 22 thereof by the urging of the pressure roller on the tape, as it moves through the nip. Electromagnet 30 driven by AC driver 32 places the magnetic latent image on the tape surface 28 in a line-by-line fashion in accordance with digitized data signals from a character generated, microprocessor, raster input scanner or the like (not shown).

In this arrangement, premagnetization of the tape surface is not required because overlapping heated picture elements or pixels 36 are allowed to cool with opposite magnetization polarities or directions frozen therein. Refer to Figure 3. Frinee fields are generated at locations 38 between opposite magnetic-polaritie...