Tactile numeric display device

Details Tactile numeric display device Tactile numeric display device

1974-10-11

1976-01-13

Caldwell, John W.

Communications: electrical

Tactual indication

With input means

35 35A, 128419PG, G08B 100

Patent

active

039328694

ABSTRACT:
A tactile numeric display apparatus comprises a plurality of concentric electrical conductor pairs extending from a panel of insulating material. The conductor pairs are arrayed in Braille groups to represent decimal positional notation. The conductor pairs selectively receive a periodic bipolar constant current pulse so that by feeling a current in the fingers when on particular conductor pairs a user can determine which numbers are displayed.

REFERENCES:
patent: 2703344 (1955-03-01), Anderson
patent: 3108268 (1963-10-01), Uttal
patent: 3395247 (1968-07-01), Fieldgate
patent: 3612061 (1971-10-01), Collins
patent: 3628193 (1971-12-01), Collins

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