Magnetic display panel using reversal magnetism
AssigneePilot Man-Nen-Hitsu Kabushiki Kaisha
InventorsYasuzo Murata, Hiroshi Sato
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Abstract
A magnetic reversal type display panel which provides clear display of records which can easily be raised by an erasure magnet. A liquid dispersion is sealed between two opposed surface plates, preferably in a cell structure. The liquid dispersion contains fine reversible magnetic display grains having magnetic poles of opposite signs tinged with different colors, a dispersion medium and a fine grain thickener. The fine reversible magnetic display grains have a residual magnetic moment within the range of 0.2 to 10 emu/g and a coercive force of not less than 500 oersteds and the liquid dispersion has a yield value of not less than 5 dynes/cm.sup.2.
Claims18
A magnetic reversal type display panel comprising:
- two opposed surface plates and a liquid dispersion sealed in the space between said surface plates, said liquid dispersion comprising fine reversible magnetic display grains having magnetic poles of opposite signs tinged with different colors, a dispersion medium and a fine grain thickener, wherein:
- (A) said fine reversible magnetic display grains have a residual magnetic moment within the range of from 0.2 to 10 emu/g and a coercive force of not less than 500 oersteds, and
- (B) said liquid dispersion has a yield value of not less than 5.0 dynes/cm.sup.2.
Dependencies are inferred from the claim text.