G - Physics – 09 – F
Patent
G - Physics
09
F
G09F 19/00 (2006.01) B43L 1/00 (2006.01) G09F 9/37 (2006.01) G02F 1/09 (2006.01)
Patent
CA 2070068
The invention of the present application relates to a magnetic display system using a display, wherein a non-magnetic substrate is applied thereonto with a microcapsule coating layer having sealed light-absorptive magnetic particles and light- reflective non-magnetic particles which are dispersed in an oily liquid, and a permanent magnet for causing a shift of the light- absorptive magnetic particles in one direction and, as a result, causing a shift of the light-reflective non-magnetic particles in the other direction. Objects of the invention reside in that the movability of the light-absorptive magnetic particles and the light- reflective non-magnetic particles are intensified when these particles are shifted in the microcapsules to invert the position, the agglomeration property of the light-absorptive magnetic particles after the position is inverted is strengthened, and the combination between the size of the particle diameters of the microcapsules and the size of the particle diameters of the light- absorptive magnetic particles and the light-reflective non-magnetic particles is optimized, whereby the contrast of brightness and darkness of characters and images formed on the display is improved and the side edge portions of the characters and images are made sharper. For this, in the microcapsule coating layer, the microcapsules having a plurality of particle diameters within a range from 100 microns to 1,000 microns are combined together. Furthermore, as the light-absorptive magnetic particles sealed in the microcapsules, the light-absorptive magnetic particles having a plurality of particle diameters ranging from 0.2 micron to several microns are used. Furthermore, a suitable amount of magnetic particles having characteristics capable of becoming the permanent magnet when magnetized after the microcapsule coating layer is coated is added. Furthermore, the mean particle diameter of the light-reflective non-magnetic particles sealed in the microcapsules ranges from 0.01 micron to several microns. Furthermore, a suitable amount of the microcapsules having a particle diameter far more minute than the mean particle diameter of the microcapsules and having sealed only the transparent oily liquid is added to the microcapsule coating layer.
Kanno Yasuyuki
Nakanishi Masayuki
Gowling Lafleur Henderson Llp
Japan Capsular Products Inc.
Tomy Company Ltd.
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