| 摘要 |
Photo-printing apparatus for duplicating a master photo-mask or plate. A copy is placed on a holder within a door pivotally mounted to a housing enclosing a light exposure system. The master plate is placed upon the housing and automatically aligned with the copy plate when the copy plate is pivoted into an operational position. The copy plate is held in place by negative pressure applied through a piston located in the door. Positive pressure is exerted upon the piston and master plate during exposure, while still maintaining the negative pressure behind the copy plate. After exposure, the positive pressure is removed and, in a preferred embodiment, a negative pressure is provided to the back of the master plate to facilitate separation of the master and copy plates.
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