Variable magnification ratio die lecture support device

摘要

PURPOSE: To enlarge a display screen so as to make it easy to view without making a device large, and to vary magnification for enlarging the display screen. ;CONSTITUTION: In this lecture supporting device, a display device 1 is arranged to be an almost horizontal surface, a half mirror positioned at a specified distance and a specified angle is arranged just above the device 1, and a convex lens 10 whose focal distance is equal to or above the diagonal dimension of the display is arranged between the display surface 101 of the device 1 and the half mirror 3. Then, the device is provided with a convex lens moving means holding the convex lens 10 nearly in parallel with the display surface and vertically moving it. The convex lens 10 and the convex lens moving means are attachably/detachably provided in the device 1.;COPYRIGHT: (C)1995,JPO