Patent ID: 8686942

Claim:
An operation input system that includes a casing and a motion sensor for detecting a movement of the casing inside the casing and calculates a position of the casing in a predetermined space based on an output of the motion sensor, the operation input system comprising: a position sensor configured to directly detect the position of the casing in the predetermined space; correction circuitry configured to correct the output of the motion sensor using an output of the position sensor; switch circuitry configured to switch on/off the output of the motion sensor; and coordinate reference change circuitry configured to change one of a reference of spatial coordinates of the position sensor and a reference of spatial coordinates of the motion sensor using a difference between a first position of the casing calculated right before the output of the motion sensor is switched off by the switch circuitry and a second position of the casing calculated right after the output of the motion sensor is switched on by the switch circuitry.