Photocopying – Projection printing and copying cameras – Step and repeat
Patent
1994-07-08
1996-08-06
Grimley, Arthur T.
Photocopying
Projection printing and copying cameras
Step and repeat
355 54, 355 86, 355 95, G03B 2742, G03B 2744, G03B 2704
Patent
active
055438903
ABSTRACT:
A process and device for adjusting distance for purposes of parallel positioning of a workpiece relative to a mask at a preset distance in which production can be done easily and with low costs. A workpiece is held at a distance from a mask on a work-holding fixture and one of the work-holding fixture and a mask carrier carrying the mask is moved by a moving device toward the other to bring the workpiece comes into contact with the mask. After such contact has occurred, movement of the moving device is continued until a signal is transmitted to a system controller from each of at least three alignment devices which are arranged on the work-holding fixture or the mask carrier, the alignment devices having calibration device which essentially begin to move beginning at a time at which the workpiece and mask come into contact with one another and can no longer execute any further relative movement. Movement of the work-holding fixture or the mask carrier is stopped when the system controller receives a signal from all of the calibration devices, which thus is assessed as achievement of a parallel alignment of the workpiece and mask relative to one another, at which time the displacement of the calibration device of each alignment device is fixed. Thereafter, the direction of movement of the one of the work-holding fixture and the mask carrier is reversed until the desired spacing distance is achieved.
REFERENCES:
patent: 3192844 (1965-07-01), Szasz et al.
patent: 4431304 (1984-02-01), Mayer
patent: 4583847 (1986-04-01), Battig et al.
Okada Shoichi
Tanaka Yoneta
Grimley Arthur T.
Kerner Herbert
Safran David S.
Ushiodenki Kabushiki Kaisha
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