Optical projector of reference dot pattern onto working surface

摘要

The stencil (3) has a pattern of transparent dots arranged in 24 x 36 format and is placed in an object plane conjugate with an image plane in the working surface about 2 m above a wide-angle lens (2).Each dot is illuminated by a separate optical fibre among a bundle (4) whose entry points are grouped in a plane (5) to receive the light from a lamp via a condenser lens (6).