Electronic calculator digital display - has optical reversing two mirror system to deflect digits into upright position

摘要

The reversing system deflects the digits into an upright pattern. At least one enlarging lens is positioned in front of the reversing system. The reversing system is formed by two mirrors whose reflecting surfaces are spaced opposite one another. The rear mirror projects beyond the front mirror upwards or downwards with one mirror inclined to the other. One lens is placed in front of the projecting reflecting surface. This lens is horizontally and vertically adjustable to the projecting reflecting surface.