The present invention discloses an electronic apparatus, an image capturing apparatus and a method thereof. The end portion of the 2-axis hinge unit is constantly exposed outside the mobile telephone. This embodiment is used to draw conclusions about the occupancy of the ripple FIFO buffer under steady-state conditions. The predetermined criterion is to check if the phase difference falls within a specific range associated with a clock period of one of the first clock signal and the second clock signal. A reflector can be near the sensor device and can reflect at least two optical beams back to the detectors associated with each of the respective optical beams.