G - Physics – 03 – B
Patent
G - Physics
03
B
95/40
G03B 27/20 (2006.01)
Patent
CA 1268652
ABSTRACT OF THE DISCLOSURE A vacuum printing frame includes a backing plate; a pressurizable bladder assembly positioned on the backing plate, the bladder assembly including a lower wall positioned on the backing plate, a plurality of partitions sealed around lower edges thereof to the lower wall and defining a series of interconnected, nested chambers arranged in alignment from and pressurizable from a head end to a foot end of the vacuum printing frame, and a plurality of holes in each partition at positions close to the securement of the respective partition to the lower wall to provide fluid communication between adjacent bladder chambers; a flexible, fluid impervious membrane positioned above the bladder assembly for supporting a mask and photosensitive sheet; a transparent plate movable between an open position for permitting the mask and photosensitive sheet to be positioned on the membrane, and a closed position for sandwiching the mask and photosensitive sheet between the membrane and the transparent plate in an evacuation region defined between the membrane and the transparent plate; a blower for supplying air under pressure to the bladder assembly when the transparent plate is in the closed position to apply a force pressing the photosensitive sheet and mask against the transparent plate in a predetermined spatial pattern, starting from an innermost chamber at the head end to an outmost chamber; and an evacuation port fluidly connected with the evacuation region for evacuating the same, the evacuation port positioned at the head end of the vacuum frame.
513057
Richards Chester L. Sr.
Swabey Ogilvy Renault
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