Rewriteable image-recording substrate, image-recording apparatus and image-erasing apparatus therefor

摘要

A rewriteable image-recording substrate has a base sheet, and an image-developing layer coated over a surface of the base sheet. The image-developing layer is composed of a plurality of split-tube elements formed of a shape memory resin exhibiting a predetermined glass-transition temperature. Each of the split-tube elements has a split formed along a central axis thereof, and is securely adhered to the surface of the base sheet such that the split of each split-tube element is oriented away from the surface of the base sheet. An outer peripheral surface of each split-tube element is colored with, for example, white, and an inner cylindrical surface thereof is colored with, for example, black.