Word: opticon
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Dates: during 1960-1969
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Linvill's "Opticon" (for Optical Tactical Converter) reflects an enlarged image of each letter onto a disk of light-sensitive transistors. The transistors, energized by the image, trigger a corresponding group of pins that vibrate in an outline identical to the printed letter. By lightly fingering the pins, the blind person can "see" the letter...