When a projection optical axis of a projector does not impinge on a plane of a screen vertically, a trapezoidal distortion occurs in an image on the screen. In order to correct the trapezoidal distortion, there is provided an angle detection apparatus for ...

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 e...

ÄProblemÜ To provide a simple-structured angle detecting apparatus and a projector utilizing a line-type passive range-finding device for use on the camera or the like. ÄMeans for ResolutionÜ A control circuit (5) computes a relative horizontal inclina...