| 摘要 |
PURPOSE:To obviate difference in photosensitivity between top and rear surfaces so as to refrain from superimpose of image even in case of applying both sides copying to the copying material by mounting a diazo photosensitive layer on the rear surface of a supporting body through a precoat layer and directly mounting the diazo photosensitive layer on the top surface of the supporting body, respectively. CONSTITUTION:The diazo photosensitive layer is mounted on the rear surface of the supporting body through the precoat layer and directly on the top surface of the supporting body, respectively. Accordingly, the sensitivity of a copy image and a formation on the rear surface are increased to almost the same degree as that of the top surface of the material. And, at the time of copying the both sides of the material, UV rays used for exposure do not transmit to the diazo photosensitive layer existing on the opposite side of the precoat layer by the presence of the precoat layer. Thus, the superimpose of the copy images existing on the top and back surfaces respectively is prevented, and the difference in the sensitivity of the photosensitive layers between the top and the rear surface of the copying material is obviated. |
