20150145775 | PORTABLE INPUT DEVICE - A portable input device includes a casing, a light sensing module and a printed circuit board. The casing includes a reflecting member. The light sensing module is movably mounted on the reflecting member and exposed from the casing. The light sensing module includes a lighting member and a sensor both facing the reflecting member. The lighting member is adapted for emitting light to the reflecting member. The sensor is adapted for receiving the light reflected by the reflecting member and configured for transmitting a sensing signal. The printed circuit board is mounted on the casing and electrically connected to the light sensing module. The printed circuit board is configured for processing the sensing signal to compute a value of movement of the light sensing module moving with respect to the reflecting member. | 05-28-2015 |