Magnetic sheet, magnetic writing system, drawing method, and erasing method
AssigneeZero Lab Co., Ltd.
InventorRitsuo Koga
Life of this patent
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Abstract
A magnetic sheet includes a first sheet, a second sheet, and a number of microcapsules disposed between the first and the second sheets. Each microcapsule contains magnetic particles, clustered magnetic particles, non-magnetic particles, clustered non-magnetic particles, a suspending agent, and a solvent. The magnetic sheet is designed so that the magnetic particles reacting to a rotating magnetic line of force applied from a side of the first sheet rotate and move in a direction opposite to a direction of rotation of the magnetic line of force and aggregate near a center of the microcapsule to stay stationary.
Claims21
A magnetic sheet comprising:
- a first sheet;
- a second sheet;
- and
- a plurality of microcapsules disposed between the first and the second sheets,
- wherein each microcapsule contains magnetic particles, clustered magnetic particles, non-magnetic particles, clustered non-magnetic particles, a suspending agent, and a solvent;
- and
- wherein the magnetic sheet is designed so that the magnetic particles reacting to a rotating magnetic line of force applied from a side of the first sheet rotate and move in a direction opposite to a direction of rotation of the magnetic line of force and aggregate near a center of the microcapsule to stay stationary.
A magnetic sheet for performing display by an action of lines of magnetic force from a magnetic pen, the magnetic sheet comprising:
- a first sheet;
- a second sheet opposed to the first sheet;
- and
- a microcapsule layer formed between the first sheet and the second sheet;
- wherein the microcapsule layer comprises a plurality of microcapsules filled with magnetic particles, clustered magnetic particles, non-magnetic particles, clustered non-magnetic particles, a suspending agent and a solvent;
- wherein the plurality of microcapsules includes a first microcapsule containing magnetic particles having at least a first magnetic susceptibility and a second microcapsule containing magnetic particles having a second magnetic susceptibility that is larger than the first magnetic susceptibility;
- wherein at least part of the magnetic particles include a material having residual magnetic characteristics;
- and
- wherein the magnetic particles of the first and second magnetic susceptibilities are rotatable and movable toward near a center of the microcapsule to stay stationary in response to external rotating magnetic field lines.
A method for use with a magnetic sheet that includes a plurality of microcapsules arranged between a first sheet and a second sheet, each microcapsule containing a magnetic substance, a non-magnetic substance, a suspending agent and a solvent, the method comprising:
- applying a rotating magnetic line of force from a side of the first sheet so that the magnetic substance reacts to the rotating magnetic line of force and is rotationally moved in a direction opposite to the direction of rotation of the magnetic line of force and is stopped near a center of the microcapsule so as to be aggregated.
Dependencies are inferred from the claim text.