Projection type duplicator

Claim 1

5A projection type duplicating apparatus, comprising: a transparent member mounted to said apparatus for positioning source material to be duplicated; means for transporting photosenstiive means along a path spaced from said transparent member and including an image receiving position; a flash discharge light source for providing radiant energy to said source material on said transparent member; a projecting lens system movable between said transparent member and said image receiving position for projecting an image of said source material to said photosensitive means at said image receiving position in accordance with a desired magnification; a number of switches positioned in spaced relationship with respect to said optical axis and individually actuated by said movable projecting lens system in accordance with said desired magnification; a number of control circuits, each one of said control circuits is connected to a respective one of said switches for controlling the lighting energy of said light source in proportion to the square of the quantity represented by said magnification plus one; a control switch mounted along said path in a position whereby said photosensitive means engages said control switch before reaching said image receiving position, said control switch having a first position and a second position, said control switch is in said first position with said photosensitive means entering said image receiving position and in said second position with said photosensitive means at said image receiving position; and a circuit for controlling the energy of said light source and including a first capacitor connected in series with said control switch and a relay actuated by the discharging of said first capacitor for energizing said light source upon arrival of said photosensitive member at said image receiving position, said first capacitor is connected to said power source and with said control switch in said first position said first capacitor is connected to said selected one of said control circuits for discharging said first capacitor with said control switch in said second position, and said relay energizing said means for transporting after completion of an exposure to remove said photosensitive means from said image receiving position.