| 摘要 |
PURPOSE:To form the aperture card which makes possible direct photographing of the subject and permits handling even under room light by providing a post-active type dry type silver image forming material on a transparent substrate thereby forming the image forming material. CONSTITUTION:A post-active type dry type image forming material which is non- sensitive under ordinary light, is given sensitivity through preheating and is a material able to form silver images through heat developing after exposure is used as the image forming material. The solution of the abovementioned image forming material is coated on the specified transparent substrate portion of a sheet member a and is then dried to provide the image forming material b, whereby the aperture card is obtained. To form a master image on the image forming part simply entails preheating the card for about 1 to 5 seconds at about 80 to 130 deg.C in the dark then exposing by the light image of the original picture then heating the card for about 1 to 60 seconds at about 80 to 130 deg.C in the dark. |
