| 摘要 |
An apparatus for reading by blind persons comprising a data medium in the form of a thick elastic belt and having formed therein a dense uniformly spaced two-dimensional array of data elements of thin membrane-like construction integral with the belt and capable of assuming stable convex and concave conditions wherein they either project upwardly from the belt to be sensible by a person's finger or down into the belt where they may not be felt. Because of the thickness of the belt, the data elements are also capable of assuming intermediate unstable conditions wherein they do not experience a transition to the opposite state simply because they are compressed flush with a surface of the belt. Means are provided for setting and resetting the data areas.
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