Hi, Am 11.05.2012 um 21:02 schrieb Lionel Broche:
> A couple of quick questions about the keyboard prototype: > - is this a flexible PCB? Or could it be printed on a flexible substrate so > that surface can be bent? The prototype [1] is a 1mm FR4 PCB because pressing the buttons needs a quite stiff counterpart. Bending should be possible, but keep in mind that the buttons we use have 4 solder joints at the corners. I don't know how easily they break when bending the PCB. But if you glue the bent PCB on a rounded stiff substrate it could work well. You could try a company like Leiton (they have an online shop for such flex PCBs): http://www.leiton.de/flex-pcb.html > - what are the dimensions of the PCB? how thick should the whole keyboard be > with the buttons included? The dimensions are following the current battery cover. I.e. it is 50x109 mm. The radius of the "ears" is 25mm. I.e. you can think of a 50x59 mm rectangle with two 25mm radius half-circles. But this is just the prototype and making a different keyboard PCB should not be a major challenge... The thickness is 1mm for the PCB and the buttons are Panasonic EVQPQ series (because they are easily available @ DigiKey): http://industrial.panasonic.com/www-data/pdf/ATK0000/ATK0000CE1.pdf Thickness is 0.55 mm. I.e. the total thickness is 1.55mm + any mechanics from housing. Hope this answers some questions... Nikolaus [1]: http://www.handheld-linux.com/wiki.php?page=GTA04%3AKeyboard _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
