Self-erasing thermochromic writing board and system

Details Self-erasing thermochromic writing board and system Self-erasing thermochromic writing board and system

1996-04-01

1998-07-28

Nguyen, Matthew V.

Incremental printing of symbolic information

Thermal marking apparatus or processes

With correction or erasing means

B41M 500

Patent

active

057868387

ABSTRACT:
A self-erasing writing system includes a writing surface structure, a writing instrument, and an erasing structure. The writing surface is preferably a laminate structure having a layer of a thermochromic material. The thermochromic material is of one color when within a certain temperature range (e.g. room temperature), but changes to a second color when the material is brought into a second temperature range (e.g. a lower temperature). The writing instrument is a temperature controlled cooled tip device that lowers the thermochromic material to within the second temperature range at the point of contact such that the points of contact become the second color. The thermochromic material has a "memory" that retains the second color until the temperature is raised to within a third temperature range at which time the thermochromic material changes back to its first color. The erasing structure is a heater either layered integral with the laminate structure or a separately applied heater as in the form of a conventional eraser. Several layers of thermochromic material may be used to provide various colors when used with a variable temperature writing instrument.

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