| 摘要 |
PROBLEM TO BE SOLVED: To prevent generation of a defective product in screen printing by preventing an error in an installation direction of a metal mask.SOLUTION: Displacements of a lock pin and a lock hole, shapes of the lock pin and lock hole, displacements of a positioning pin and a guide hole, shapes of the positioning pin and the guide hole, arrangements of the positioning pin and the guide hole, sizes of notches of a metal mask and shapes of the notches of the metal mask are so made as to be asymmetrical with each other, thereby giving discrimination between top and bottom, left and right, or front and back to the shape of the metal mask. This metal mask cannot be installed onto a metal mask stretching jig, if an error occurs between top and bottom, left and right, or front and back.SELECTED DRAWING: Figure 10 |
