bellutta@ai.mit.edu (Paolo Bellutta) (04/17/91)
I need to find the makers of those pressure sensitive sandwiches which are used for example in drum machines. This sandwich should have a layer of semiconductive plastic on a conductive layer and between them is a plastic insulator, then when pressure is applied, it is possible to measure the position, and possibly the applied pressure. The use would be as person counter, under a carpet. Do any one of you know of such kind of product? Any pointer to this is welcome. Please reply via e-mail. Paolo Bellutta I.R.S.T. vox: +39 461 814417 loc. Pante' di Povo fax: +39 461 810851 38050 POVO (TN) e-mail: bellutta@irst.it ITALY bellutta@irst.uucp
smith@sndpit.enet.dec.com (Willie Smith) (04/18/91)
In article <14978@life.ai.mit.edu>, bellutta@ai.mit.edu (Paolo Bellutta) writes... >I need to find the makers of those pressure sensitive sandwiches which I can't reply by Email, as you didn't provide an Internet adress, but I got a sample of a pressure sensitive resistor the other day from a company called: Interlink Electronics PO Box 40760 Santa Barbara, CA 93013 (805) 684-2100 Fax (805) 684-8282 The sample is rather interesting, it's a 3/4-inch square pressure sensitive resistor bonded into a flex circuit and printed up to resemble a business card! Works rather well too... There is an Interlink in Europe somewhere, but that information isn't on the card. Willie Smith smith@sndpit.enet.dec.com smith%sndpit.enet.dec.com@decwrl.dec.com {Usenet!Backbone}!decwrl!sndpit.enet.dec.com!smith
lairdkb@mentor.cc.purdue.edu (Kyler Laird) (04/18/91)
I'm looking for a touch sensitive overlay for an LCD. A multi-point pressure sensitive plastic sheet sounds perfect. I had thought about buying an UnMouse and taking it apart, but I'd rather buy something closer to the size I need. (I don't know exactly what size that is yet - 4x6"?) Thanks for any pointers! --kyler
jeff@hpuplca.nsr.hp.com ( Jeff Gruszynski ) (04/18/91)
/ hpuplca:sci.electronics / bellutta@ai.mit.edu (Paolo Bellutta) / 8:22 am Apr 17, 1991 / > I need to find the makers of those pressure sensitive sandwiches which are > used for example in drum machines. This sandwich should have a layer of > semiconductive plastic on a conductive layer and between them is a plastic > insulator, then when pressure is applied, it is possible to measure the > position, and possibly the applied pressure. The use would be as person > counter, under a carpet. Do any one of you know of such kind of product? > Any pointer to this is welcome. > > Please reply via e-mail. > > Paolo Bellutta > I.R.S.T. vox: +39 461 814417 > loc. Pante' di Povo fax: +39 461 810851 > 38050 POVO (TN) e-mail: bellutta@irst.it > ITALY bellutta@irst.uucp > ---------- It's called Kynar (tm) and it's made by Penwalt Corp. Jeff Gruszynski Santa Clara Sales Hewlett Packard Corporation
wli@fornax.UUCP (William Li) (04/18/91)
In article <14978@life.ai.mit.edu>, bellutta@ai.mit.edu (Paolo Bellutta) writes: > I need to find the makers of those pressure sensitive sandwiches which are > used for example in drum machines. This sandwich should have a layer of > semiconductive plastic on a conductive layer and between them is a plastic > insulator, then when pressure is applied, it is possible to measure the > position, and possibly the applied pressure. The use would be as a person > counter, under a carpet. Do any one of you know of such kind of product? Offhand, I can think of a couple of different products. One is Kynar's piezoelectric film, based on TPFE. Kynar is based out of Pennsylvania in the U.S. Unfortunately, I've lost their address (sorry!). Interlink (Montecito California, (805) 684-2100) is based around a pressure-sensitive resistor product. By putting intermeshing silver fingers on top of a sheet of the pressure-sensitive resistor, one can get linear position. Two crossed linear potentiometers, as they're called, give an "XYZ pad". The question, though, is how big of an area you want to rig up. Interlink's stock product XYZ pads hover around 4"x4". How much sensitivity do you need in your positions? You might be able to get away with rigging up a regularly-spaced grid of strain gauges (I believe Omega makes a line of strain gauges). - William Li School of Engineering Science Simon Fraser University Burnaby BC Canada V5A 1S6 Tel: (604) 291-4451 Fax: (604) 291-4951
smith@sndpit.enet.dec.com (Willie Smith) (04/18/91)
In article <10674@mentor.cc.purdue.edu>, lairdkb@mentor.cc.purdue.edu (Kyler Laird) writes... >I'm looking for a touch sensitive overlay for an LCD. A multi-point >pressure sensitive plastic sheet sounds perfect. Again, talk to Interlink Electronics (see my previous note, I don't have contact info here), they even make X-Y-Z arrays, as their pressure sensitive resistor gives you the magnitude of the applied force. Or are you looking for a clear touch-screen overlay? Willie Smith smith@sndpit.enet.dec.com smith%sndpit.enet.dec.com@decwrl.dec.com {Usenet!Backbone}!decwrl!sndpit.enet.dec.com!smith