| 摘要 |
A reversible colorful writing apparatus includes a reversible writing board composed of a plurality of coloring picture tubes each filled with a plurality of immiscible coloring liquids in each coloring picture tube and suspended with a miniature magnet within each picture tube, and an inkless writing pen having a stepping-motor control circuit provided within the writing pen; whereby upon moving of the pen on the board, the stepping-motor control circuit will drive the miniature magnet forwardly (or reversely) in each picture tube to drive the immiscible coloring liquids forwardly (or reversely); and upon setting of the magnet at a specific position in the tube, a specific coloring liquid corresponding to such a specific magnet position will be driven to the top surface of the picture tube to display such a specific color on the board.
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