AUTOMATIC FOCUSING CONTROLLER

PURPOSE:To always properly execute automatic focusing with respect to every image by changing the magnification of the projecting image and reading an image area whose contrast is strong. CONSTITUTION:When an AF button 38 provided on the outer frame 2A of a screen is depressed, such an action that the projected image is enlarged and reduced is executed first so that the edge part of the projected image is detected by an image sensor 5. It is judged, according to the output of the signal of waveform having the contrast from the sensor 5, whether it is the edge of the image or not. When the edge part is recognized, the focusing is executed next so that the inclination of the waveform of the detected contrast becomes the maximum. This is because the edge part of the image is clearly projected under the state that the inclination is the maximum. When the focusing is finished, the magnification of zoom is returned to an original state and operation is finished.