| 摘要 |
In an angle detecting apparatus and projector using range finders, range finding calculations are performed in plural directions using line type passive range finders as a range finding portion. Thus, if one range finding result is an abnormal value, the effects are reduced. The structure is miniaturized. <H0> ÄMeans for ResolutionÜ </H0> <??>A control circuit 5 calculates four horizontal relative inclination angles between a screen 1 and a projector 2 based on results of range finding calculations of a line type passive range finder 3 doing range finding in five directions, finds their average value, calculates four vertical relative inclination angles between the screen 1 and the projector 2 based on the results of range finding of a line type passive range finder 4 doing range finding in five directions, and finds their average value. A display driving portion 7 adjusts a projection optical system 8 including a condensing lens based on the horizontal and vertical inclination angles calculated by the control circuit 5 and on the distance between range finding calculational regions, thus correcting keystone distortion in the projected image. <IMAGE> |
