Patent ID: 8218216
Filing Date: 2012-07-10
Classification: F21S,G02B,G03B,H04N,Y10S

Abstract:
1. An image projector for projecting an image onto a projection plane, comprising: a casing; a light source mounted to the casing; a deflector having a reflector for reflecting a light flux emitted from said light source and two-dimensionally deflecting said light flux by turning said reflector around a first axis as a center and turning said reflector around a second axis as a center, the second axis almost orthogonal to said first axis, wherein the reflector is planar in shape and substantially rectangular with a pair of edges thereof substantially parallel to the first axis and a pair of edges substantially parallel to the second axis, said deflector comprising: a deflection controller for controlling said piezoelectric elements to cause the reflector to turn around said second axis as a center by resonant drive and to turn around said first axis as a center by non-resonant drive; and a projection optical system for projecting said image onto said projection plane by guiding the light flux deflected by said deflector onto said projection plane, the projection optical system having one or more optical surfaces, wherein a shape of one or more optical surfaces of said projection optical system includes a shape for performing a one-scan-direction scan speed correction for maintaining scanning speed of said light flux along one scan direction on said projection plane almost constant and a shape for performing an other-scan-direction distortion correction for suppressing a distortion in an image along the other scan direction almost orthogonal to said one scan direction on said projection plane, and wherein said deflection controller performs at least one of an other-scan-direction scan speed correction for maintaining scanning speed of said light flux along said other scan direction on said projection plane almost constant by controlling a turn of said reflector around said first axis as a center, and a one-scan-direction distortion correction for suppressing a distortion in an image along said one scan direction on said projection plane by controlling a turn of said reflector around said second axis as a center.