| 摘要 |
<p>PURPOSE:To prevent interpolation and the like by a method wherein an effective photosensitive area which is coated with a positive photosensitive material and capable of forming an image thereon is formed on a specific area on a card board, and an ineffective photosensitive area through which a substrate sheet of the card board is visible is formed on the remaining area. CONSTITUTION:An effective photosensitive area 12 which is coated with a positive photosensitive material and capable of forming an image thereon is formed on a specific area on the surface of a substrate sheet. The positive photosensitive material is sprayed on the specific area on a card 30 through a window 32 of a masking plate 31 by a spray gun 33. An ineffective photosensitive area is formed by subjecting an area other than the specific area of the card 30 previously coated with the positive photosensitive material all over the surface thereof to a light exposure for decoloring the photosensitive material. The shape of a light shielding window 35 of an optical mask 34 is made coincident with that of the effective photosensitive area. In this manner, the photosensitive material coated card 30 provided with the effective photosensitive area and the ineffective photosensitive area on a card board is formed.</p> |
