located an uppermost film unit 94 in the focal plane within the housing 12 or in an exposure position adjacent the opening 44 in the intermediate wall 38 the film units 90 are of the integral self developing type with each unit including a rupturable pod of processing liquid at their leading end and a trap at their trailing end for receiving any excess processing liquid as is well known in the art the cassette 84 may also enclose a 6 vdc battery not shown for supplying electrical power to the various electrical systems and subsystems within the copying apparatus 10 the copying apparatus 10 includes a pair of rails 96a and 96b on an interior surface of a bottom wall 98 of the housing 12 for supporting the film cassette 84 in position for the sequential exposure of the film units 90 for a more detailed description of integral film units of the type employed herein reference may be had to u s pat no 3 415 644 issued to e h land on dec 10 1968 and u s pat no 3 594 164 issued to h g rogers on jul 20 1971 with additional reference to fig5 of the drawings which is a partial sectional view taken on the line 5 5 in drawing fig2 the microlens assembly 52 having a 6 vdc motor not shown coupled thereto is driven by this motor across the opening 44 in intermediate wall 38 during each exposure cycle the microlens assembly 52 is driven across the opening 44.