| 摘要 |
1,144,867. Moulding lenses. R. STEDING. 13 June, 1967 [7 July, 1966], No. 27136/67. Heading B5A. [Also in Division C7] An embossing or injection mould, for producing plastic multiple optical lenses for advertising posters of cylindrical, circular or facet form by heat and pressure on the surface of transparent plastic foil, is made by coating a conductive (e.g. steel) plate 3 with a photo-resist layer 4, exposing and developing the layer to produce thereon conductive areas, e.g. slots 5, corresponding to the axes of the lenses, electrodepositing on such areas lens-shaped projections 6 of metal which build up and grow laterally as shown so that the edges of adjacent projections make contact to form acute angles to form a positive master, applying to the surface so formed a separating layer, e.g. by treatment with ammonium bichromate or chromium plating, building up a negative metal (e.g. Cu or Ni) layer 7, Fig. 3, upon the separating layer, e.g. using a chemical plating bath followed by an electroplating bath, separating, e.g. by peeling off, the negative metal layer and mounting it, e.g. by an adhesive layer 8, upon a support such as a plate 9 or roller for use as a mould in producing the multiple lens foil. Preferably, the metal layer 7 peeled off is subjected to a heat hardening process. |
