MOIRE FRINGE OPTICAL DISPLAY & PROJECTION EQUIPMENT

摘要

Optical display or projection equipment, using Moire fringes to create moving or animated effects. A transparent sheet carrying special diagrams is superimposed over a moving transparent belt, having a graticule of close parallel lines. The sheet and belt are formed of flexible plastics material. The sheet diagram may be constructed by cutting out sections from a "kit" of pre-printed sheets, and a plurality of sheets may be pivotally attached to a cardboard frame, to build up a complete diagram in successive stages. The apparatus may also include a projector with winding means to convey the belt either from one roller to another roller, across the optical axis, or in a continuous closed loop.