Patent ID: 8022943

Claim:
A controller arrangement for an optical sensing pen having a nib, the controller arrangement configured to operatively sense location data by sensing location tags on a page of printed media, and to calculate an orientation of the pen and a nib-to-tag distance, said controller arrangement comprising: an infrared (IR) illumination LED and image sensor assembly configured to transmit IR light onto, and receive IR light reflected from, respectively, the page of printed media; a force sensing infrared LED and photodiode assembly configured to detect when the nib contacts the page so that the sensor assembly is only activated when the nib is in contact with said page; an accelerometer configured to allow the controller to sense motion without reference to the location tags; a transceiver and antenna assembly; and a processor arranged in signal communication with, and configured to control, the sensor assembly, the photodiode assembly, the accelerometer and antenna assembly to operatively calculate the orientation of the pen and the nib-to-tag distance, and to transmit the location data to a computing system.