Improved 16mm Projector for Research Films

S. A. Weinberg, J. S. Watson, G. H. Ramsey

The flicker-free, slow-motion and single-frame projector described in the November 1954 issue of the SMPTE Journal has been completely redesigned to give more reliable and smoother operation. In the transition from cine to single-frame projection, the 5-blade shutter is shifted to one side, leaving a single 42° blade to occult the film aperture during film transport. An electrical interlock in the push-button-triggering circuit excludes any possibility of overrun and assures uniform registration of successive frames. Also described is an experimental version of the projector with a 10-blade shutter and 12° pulldown. It provides relatively flicker-free projection at speeds from 5 to 3 frames/sec.

Print ISSN
Published
1957-06
Content type
Original Research
DOI
10.5594/J11241