Magnetographic printing apparatus

Details Magnetographic printing apparatus Magnetographic printing apparatus

1977-04-18

1979-01-16

Lucas, Jay P.

Recorders

Magnetographic

360137, 365 10, G03G 1900, G11B 1500

Patent

active

041351959

ABSTRACT:
Magnetographic printing apparatus having scan magnetization of the recording surface. A bubble plate is provided adjacent the recording surface upon which bubble magnetic domains are propagated in a direction perpendicular to the direction of movement of the recording medium. A row of electromagnetic recording heads on the opposite side of the recording medium from the bubble plate are energized to produce a magnetic field which, when added to the magnetic field of the bubbles, is sufficiently high to cause magnetization of selected portions of the recording medium. In a second embodiment, a belt having magnetically permeable vanes mounted thereon is positioned on the side of the recording medium opposite the electromagnets. The vanes concentrate the magnetic field from the electromagnets to a sufficiently high value to magnetize the recording medium. Recording mediums having a compensation temperature greater than the temperature at which the recording medium is magnetized are disclosed with a heater to heat the recording medium to the compensation temperature to transfer toner particles to a paper surface and temporarily erase the recording medium. Embodiments are disclosed in which the toner particles are attracted directly to the surface of the paper eliminating the need for recording drum or belt.

REFERENCES:
patent: 3161544 (1964-12-01), Berry
patent: 3611421 (1971-10-01), Benoit
patent: 3793639 (1974-02-01), Enz
patent: 3793640 (1974-02-01), Potgiesser
patent: 3815107 (1974-06-01), Almasi
patent: 3827077 (1974-07-01), Kobilka
patent: 3845306 (1974-10-01), Kohlmannsperger
patent: 3935594 (1976-01-01), DE Jonge
patent: 3988739 (1976-10-01), Fan
IBM Tech. Discl. Bulletin, vol. 17, #4, 9-74, "Magnetic Bubble Domain Display," Dove et al., p. 1045.
IBM Tech. Discl. Bulletin, vol. 17, #11, 4-75, "Magnetic Bubble Domain Interactive Screen".

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