| 摘要 |
PURPOSE:To obtain holograms which have excellent moisture resistance and long-term stability and are free from out of focus by adhering a sheet of two sheets of cover glass divided concentrically on a gelatin layer prior to photographing and adhering the remaining one sheet in a final stage. CONSTITUTION:A gelatin layer 2 is proveded on a doughnut-like substrate 1 1 consisting of glass or plastics, and after the layer 2 is exposed and sensitized, the gelatin layer (c) at the periphery of the inside diameter (a) of the substrate 1 is removed. A sheet 3 of two sheets of cover glass obtained by diveding a sheet of cover glass flatly and concentrically is disposed concentrically on the layer 2. The inside diameter part A thereof is adhered by means of an adhesive agent and is mounted to a flange 5, and the gelatin layer is subjected to photographing, developing, drying, baking, etc. The remaining cover glass 4 is disposed concentrically, and the inside diameter part B and the outside circumferential part C of the outside diameter thereof are adhered by means of an adhesive agent, whereby an intended gologram is obtained. |
