Apparatus for projecting selected images of a scene onto a screen, such as images of a golf course looking toward a green, and for projecting and moving a spot of light on the screen superimposed on the scene, such as to represent the travel of a hit golf ball toward the green in the scene, provides...http://www.google.fr/patents/US5340108?utm_source=gb-gplus-shareBrevet US5340108 - Apparatus for projecting and moving a spot of light in a scene projected on a screen and for controlling operation of a stepper motor used therewith
Apparatus for projecting and moving a spot of light in a scene projected on ...
