ramsesoriginal ramsesoriginal at
Thu May 29 12:29:37 CEST 2008

More or less I knew that, but, as you can see in the video/read in the
news, microsoft stated tat the Windows 7 Multitouch works on "standard

On Thu, May 29, 2008 at 7:37 AM, Federico Lorenzi <florenzi at> wrote:
> On Thu, May 29, 2008 at 7:33 AM, Federico Lorenzi <florenzi at> wrote:
>> Not really, normal touch screen tablets have a capacitive touch
>> screen, which is why they usually only work with a special pen, and
>> you can rest your hand on them.
> Correcting myself - from Wikipedia:
> Passive tablets, most notably those by Wacom, make use of
> electromagnetic induction technology, where the horizontal and
> vertical wires of the tablet operate as both transmitting and
> receiving coils (as opposed to the wires of the RAND Tablet which only
> transmit). The tablet generates an electromagnetic signal, which is
> received by the LC circuit in the pen. The wires in the tablet then
> change to a receiving mode and read the signal generated by the pen.
> Modern arrangements also provide pressure sensitivity and one or more
> switches (similar to the buttons on a mouse), with the electronics for
> this information present in the pen itself, not the tablet. On older
> tablets, changing the pressure on the pen nub or pressing a switch
> changed the properties of the LC circuit, affecting the signal
> generated by the pen, which modern ones often encode a digital data
> stream onto the signal. By using electromagnetic signals, the tablet
> is able to sense the stylus position without the stylus having to even
> touch the surface, and powering the pen with this signal means that
> devices used with the tablet never need batteries. Wacom's patents
> don't permit their competitors to employ such techniques.
> Cheers,
> Federico
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