UNIT RECORD SCREENING VIEWER.
BAUSCH AND LOMB INC ROCHESTER N Y
Pagination or Media Count:
The Unit Record Screening Viewer is a high resolution, rear projection viewer designed primarily for screening large numbers of mounted 70 X 100 millimeter film chips. The photographic images and the human readable code recorded on the film chip are projected at a fixed 6.5X magnification on the integral screen. The motorized chip changer mechanism may be operated from either local or remote positions for sequential screening of up to 64 mounted chips when loaded in an appropriate magazine. Chip placement in the projection focal plane is accomplished by the use of an electro-mechanical shaft positioner containing a two position stop cam and pawl device. The two cam positions correspond to the Load and Operate positions of the instrument. The large projection format required a novel condenser system utilizing rectangular shaped lenses allowing for space considerations. The film gate temperture is held within reasonable limits by the incorporation of a heat controlling multi-layer filter in the condenser system. A major problem was concerned with the magazine advance requirements. The mount thickness and magazine slot dimension decreed that the magazine must be advanced one step plus or minus 0.003 inches to permit the mount to re-engage properly in the magazine. Both the mount and the slot had square edges thus requiring precise indexing. Author