Patent ID: 7690797

Claim:
A projector comprising: a projection lens of which a focus lens is movable along an optical axis; a focus adjustment unit for moving said focus lens; an acceleration sensor for detecting acceleration of a housing in which said projection lens is arranged; a determination unit for determining whether said housing is in a stationary state or in a moving state in accordance with an output of said acceleration sensor, and for determining a direction to which said housing has moved and a distance that said housing has moved in accordance with an output of said acceleration sensor when said housing is in the moving state; and a control unit for determining a direction and a distance that said focus lens is to be moved in accordance with the direction and the distance that said housing has moved, which are supplied from said determination unit and for controlling movement of said focus lens based on prediction control, while the housing moves, by said focus adjustment unit in accordance with the determined direction and the determined distance of said focus lens.