| 摘要 |
PURPOSE:To form easily a shadow mask pattern from a flat type mask pattern through contact printing by using a light-transmitting rotary disc which has a light shading section changing its shading area continuously from the optical axis of artificial parallel light rays toward the circumferential area. CONSTITUTION:The light from a light source 1 is spreaded through a lens 2 to form artificial parallel light rays 3 so that those light rays are irradiated on the screen on which a flat type shadow mask pattern 13, a contact printer 12, and a sensitive material 14 are arranged. And, between the light source and the screen, a light-transmitting rotary disc 4, which has a light shading section 6 changing its shading area continuously from its center area 7 toward its circumferential area 8, is placed in such a manner that the rotary disk 4 may rotate freely and the distance to the lens 2 can be changed. After being exposed to the light, the sensitive material 14 is taken out from the contact printer 12, and then developed to produce a graded type shadow mask pattern. Therefore, the grading can be made freely at the position of the rotary disk 4 and it can be easily produced with high accuracy. |
