Magnetic powder swimming type writing board

Abstract

The invention relates to a novel magnet powder swimming writing board, characterized in that: it is composed of a writing core board, an elastic board and a magnet board, the baseboard of the writing core board is adjacent to the elastic board, the elastic board is adjacent to the magnet board, the layer number of the grids between the face board of the writing core board and the baseboard for separating write-display liquid is not less than 2 and not greater than 30, and the writing core board is a flexible core board, and the magnet board is made of permanent magnet or electromagnet. As writing, the writing core board and the magnet board are isolated by the elastic board, where the isolating space does not influence the handwriting of the writing core board; as erasing the handwriting, the writing core board is pressed to the magnet board and the writing core board and the elastic board near to force bearing point partially deform to make the part of the writing core board near to the force bearing point approach to the magnet board so that the magnet board acts on the magnet powder in this part to eliminate the handwriting.

Description

technical field [0001] The invention relates to a magnetic powder swimming type writing board. Background technique [0002] The writing core board of the existing magnetic powder swimming type writing board is composed of a panel, a grid, a liquid and a base plate. The magnetic writing boards in the prior art are divided into general grid writing boards and microcapsule magnetic writing boards. Due to the limited diameter of the microcapsules, the latter cannot effectively cover the magnetic powder with colored liquid. In the former, because the grid depth of the writing core board is sufficient to allow the colored liquid to effectively cover the magnetic powder, the handwriting is displayed clearly, but the writing core board produced by the prior art has poor flexibility, and the erasing method is mostly the magnetic stripe erasing method on the back (US Patent No. 4143472 involved) , can not realize partial erasure; Chinese Patent No. 02113235 and Chinese Patent No. 99...

AI Technical Summary

Problems solved by technology

The magnetic writing boards in the prior art are divided into general grid writing boards and microcapsule magnetic writing boards. Due to the limited diameter of the microcapsules in the latter, the colored liquid cannot effectively cover the magnetic powder, the background color is deep, and the long-distance handwriting is not displayed clearly.

In the former, because the grid depth of the writing core board is sufficient to allow the colored liquid to effectively cover the magnetic powder, the handwriting is displayed clearly, but the writing core board produced by the prior art has poor flexibility, and the erasing method is mostly the magnetic stripe erasing method on the back (US Patent No. 4143472 involved) , can not realize partial erasure; Chinese Patent No. 02113235 and Chinese Patent No. 99231331 involve erasing methods to realize partial erasing, but their common disadvantage is that the structure is more complicated; the structure involved in Chinese Patent No. 99209658.8 is based on the writing core board and There is a magnetic plate behind the magnetic strip. Since the patent does not involve the improvement of the core plate, the core plate manufactured by the existing technology is not flexible enough to realize the functions involved in the patent

The core board involved in the Chinese patent 200420033818.5 "Magnetic Writing Board Core Board" proposes a new grid structure, but this patent only achieves a good fit between the panel and the bottom plate and the grid before filling the liquid

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