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Single Layer Electromagnetic Display Board

IP.com Disclosure Number: IPCOM000090356D
Original Publication Date: 1969-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Dingwall, RP: AUTHOR [+2]

Abstract

Computer input-output data is visually displayed in dot matrix form on electromagnetic display board 10. Data is also displayed by manually manipulating a magnetic stylus. Board 10 comprises a sandwich structure of three flat rectangular panels 11, 13, and 15 shown in expanded relationship. Backpanel 11 is formed of nonmagnetic material such as fiberglass and can be transparent or not. Front panel 15 is made of transparent material for visibility into apertures 18. Central panel 13, of nonmagnetic material, has apertures 18 in a square matrix pattern. This panel 13 is formed of magnetic material such as a prepolyurethane formulation with a filler of iron oxide made by a foaming and compressing process, preferably in a loose-pin mold. Two magnetic field producing coils 23 and 24 are arranged about each aperture of panel 13.

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Single Layer Electromagnetic Display Board

Computer input-output data is visually displayed in dot matrix form on electromagnetic display board 10. Data is also displayed by manually manipulating a magnetic stylus. Board 10 comprises a sandwich structure of three flat rectangular panels 11, 13, and 15 shown in expanded relationship. Backpanel 11 is formed of nonmagnetic material such as fiberglass and can be transparent or not. Front panel 15 is made of transparent material for visibility into apertures 18. Central panel 13, of nonmagnetic material, has apertures 18 in a square matrix pattern. This panel 13 is formed of magnetic material such as a prepolyurethane formulation with a filler of iron oxide made by a foaming and compressing process, preferably in a loose-pin mold. Two magnetic field producing coils 23 and 24 are arranged about each aperture of panel 13. The coils in each horizontal row are connected in series as are those in each vertical column. The series-connected coils 23 and 24 are wound on the pins of the loose-pin molding element with enameled magnet wire so that the wires are firmly embedded in the completed panel.

Disks 20, of the same magnetic material as that of panel 13, are loosely contained in each of the cavities formed by the apertures 18 in panel 13 and panels 11 and 15. Disks 20 are of dimensions permitting them to be flipped over within the cavities. One side of each disk 20 is coated with a pigment of color contrasting with that of...