Re: Circuit that produces a tingling sensation in the fingers.

From: Keith Wootten (keith_at_nononono.co.uk)
Date: 12/13/04 

Date: Mon, 13 Dec 2004 15:46:13 +0000

In message <41b6f241$1_1@news.ecore.net>, Roland Zitzke
<FODVRUTMSTJC@spammotel.com> writes
>
>"Denis Gleeson" <dgleeson-2@utvinternet.com> schrieb im Newsbeitrag
>news:184c35f9.0412040855.6a4a25df@posting.google.com...
>> the possibility of allowing the identification of items through a
>> persons sense of touch.
>
>
>Since the late 1970s there were devices available called Optacons.
>http://www.nfbae.ca/publications/index.php?id=375
>
>Unfortunatly this technology has disappeared from the market. It essencially
>consists of a neadle array (20 x 5) where such trigger is stimmulated by
>vibrating certain sets of these pins at a time.
>This in fact allows detailed pattern recognition without the effect of
>distress on the finger.
>I am using such device for 25 years now myself and as an engineer I am
>constantly looking for techniques to replace / rebuilt it.

<Snip>

I wonder if single line of (say) 16 small needles with 16 photodiodes
(or whatever) controlling them would work? Rather than move your finger
across a fixed array of pins, you have the line of pin/sensors fixed to
your finger and move the line across the object.

Some years ago I tried the electrical stimulation technique but found it
impossible to set a useable frequency/voltage/current. Only small
changes in pressure or moistness varied the stimulus between
undetectable and painful.

Cheers 

-- 
Keith Wootten

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