| 摘要 |
<P>PROBLEM TO BE SOLVED: To achieve the shortening of the installation time of a projection device and the simplification of the installation of the device. <P>SOLUTION: In the projector device having a video display element for displaying an inputted video signal as a picture, an electric circuit substrate for performing driving control for the video display element and each electric circuit element, a range-finding element for measuring a distance from a projector to a screen, and a zoom projection lens shifted in terms of an optical axis, range-finding is performed by setting one point below the center of a projected picture at a wide projection viewing angle as the center of range-finding field. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
