Patent ID: 7688506

Claim:
A screen onto which modulated light emitted from a light source is projected, the screen comprising: a securing member; a diffuser plate supported by the securing member using a plurality of elastic members, the plurality of elastic members being disposed so that the diffuser plate is resiliently displaced in two directions in a plane of the diffuser plate, wherein the plurality of elastic members include at least two leaf springs and wherein at least one of the at least two leaf springs is disposed so that a length direction thereof is directed along one of the two directions, and at least one other of the at least two leaf springs is disposed so that a length direction thereof is directed along the other of the two directions, and width directions of the at least two leaf springs are directed along an optical axis of the modulated light emitted from the light source; and first and second voice coil motors that move the diffuser plate with respect to the securing member in the two directions in the plane of the diffuser plate, wherein a sine-wave voltage applied to the first voice coil motor has a ninety degree phase difference with respect to a sine-wave voltage applied to the second voice coil motor, each of the first and second voice coil motors comprising a magnet secured to the securing member, a yoke secured to the securing member, and a coil secured to the diffuser plate.