| 摘要 |
PURPOSE:To improve moisture resistance and diffraction efficiency by coating a hologram of a photosensitive material composed of a silver salt emulsion or dichromate-gelatin by another transparent and flexible material layer on a transparent base plate. CONSTITUTION:A hologram is used on a film 4 by using a photosensitive material 2 of a silver salt emulsion, etc. and a film 7 is stuck together thereto to sandwich the material 2. A PVC resin or polyester resin, etc. are used as the transparent and flexible material for the film 7, and the resin is stuck together to the film 4 by using an adhesive agent of an epoxy resin or photosetting resin, etc. The hermetic sealing is thus accomplished without changing the characteristic of the hologram and higher diffraction efficiency is made possible. |
