Browse Prior Art Database

Manual Tactile Converter

IP.com Disclosure Number: IPCOM000082573D
Original Publication Date: 1975-Jan-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Schaaf, RL: AUTHOR

Abstract

The system as depicted schematically is a hand-guided probe which converts a printed page into tactile forms.

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Manual Tactile Converter

The system as depicted schematically is a hand-guided probe which converts a printed page into tactile forms.

Figs. 1 and 2 show an arrangement whereby a scanner 10, a detector 12 and a transducer 14 are packaged in a hand-held unit to form a closed-loop system.

Fig. 3 shows the transducer outputting the printed information in tactile form so that a blind person may read. Each crystal along the transducer is repeatedly impulsed at a high rate, in order to appear to the reader that all points are present simultaneously.

With reference to Fig. 4, a scanner 10 comprising shift register 16 interconnected to a plurality of light-emitting diodes (LED's) 18 and a bank of silicon-controlled rectifiers (SCR's) 20 scans a printed page. Each position of the shift register drives one LED and a corresponding SCR. The shift register contains one active bit which is circulated under control of a free-running oscillator and sequentially activates each LED/SCR pair.

A plurality of converging optical light guides 22 transmit the output of the LED's into a lens system 24. The output of lens system 24 is detected by a photodiode 26 whose output activates SCR switch 28. Switch 28 distributes an alternating voltage to face B of a plurality of piezoelectric crystals in transducer
14. Simultaneously, each SCR in bank 20 distributes an alternating voltage to face A of the plurality of piezoelectric crystal in transducer 14. The crystals of transducer 14 are Y-axi...