| 摘要 |
PURPOSE:To obtain a high quality shadow mask by providing means for suppressing promotion of dark reaction at more than one positions behind photosensitive film forming process, back/for of exposure process and before developing process. CONSTITUTION:Means for suppressing aging due to dark reaction at non-exposed section of photo-sensitive film are provided on at least one position behind photo- sensitive film forming process, back/for of exposure process and before developing process. For example original negative pattern 17 positioned with black dot 16 is contacted tightly on both faces of shadow mask metal plate 14 fed through a roller 15 then exposed by light from an ultraviolet light source to harden the photo-sensitive film except black dot 16 section optically. While suction and exhaust tubes 211, 212 are provided in a dark box 18 at the winding side while an air-conditioner 26 comprising an evaporator 22, fan 23, refrigerator 24 and electric heater 25 is placed in the suction tube 211 to maintain the environment in the dark chamber 18 below 18 deg.C and relative humidity of 40- 60% under the condition for suppressing aging of the non-exposed section of photo-sensitive film. |
