Many of us have already tried to run through the possibilities on this, and come up dry. (Which is not to say that you shouldn't.) I once looked into micro EM solonoids, with no success. Regards, Luke On Tue, 22 Jul 2003, Nick Nelissen wrote: > Thanks for that description. > Could you tell me how large each dot would be and how much downward pressure > would it have to resist? > I am thinking that there may be other ways to do this. As an example, some > alpha-numeric displays for outdoor use are electro-mechanical in that they > swing a little colored disk around behind a black half disk to show on and > off. This of course is not the same as raising a dot, but it would be > interesting if there is already an actuator out there in some mass produced > piece of equipment that could be used. > > Thanks, > Nick > > > On Tue, 22 Jul 2003 10:48, Tommy Craig wrote: > > Hi, > > > > I don't know if I can give you very precise measurements but I'll try. > > Braille cells are made using piezo-electric crystals. This is one of the > > biggest cost. These crystals change their properties when current is > > applied to them. These crystals are used to raise and lower pins that make > > up the Braille cell. Braille displays use eight dot Braille instead of six > > dot Braille. All of these parts have to be made with very high precission. > > They then have to be assembled. Unlike most electronics which have no > > moving parts, Braille cells have numerous moving parts. The visible part of > > the cell is about 3/8 of an inch wide and about 1.25 inches long. The part > > you don't see is about 4 inches long and stands about an inch high. These > > cells plug into a circuit board and then all of them are held together by > > some sort of rod that runs through the cells. This all takes a lot of > > manual labor to assemble. > > > > Tommy > > > > > _______________________________________________ > > Blinux-list@xxxxxxxxxx > https://www.redhat.com/mailman/listinfo/blinux-list > _______________________________________________ Blinux-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/blinux-list