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List:       openmoko-community
Subject:    Re: [Gta04-owner] [ANN] GTA04 Keyboard prototype
From:       "Dr. H. Nikolaus Schaller" <hns () goldelico ! com>
Date:       2012-05-12 16:10:09
Message-ID: F7EBC5DE-4C44-4553-BA2C-2DD7AD625EAE () goldelico ! com
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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
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