| 摘要 |
<P>PROBLEM TO BE SOLVED: To miniaturize a projection surface inclination measuring device and a projector. <P>SOLUTION: A projection surface inclination measuring device 11 comprises a light projection unit and incident angle sensors. The incident angle sensors are arranged respectively by two in a horizontal direction and in a vertical direction. The light projection unit projects light to two range-finding points set respectively in the horizontal direction and in the vertical direction on a screen S to form light projection spots. The incident angle sensor receives reflected light from the light projection spots, and detects incident angle of the reflected light. The incident angle sensor consists of two-split light receiving elements, and detects the incident angle of the reflected light on the basis of a light receiving rate of the light entering two light receiving elements. By this constitution, an essential lens in a phase sensor is not required, and focal distance of a lens is not required to be secured to enable miniaturization. <P>COPYRIGHT: (C)2013,JPO&INPIT |
