Metal vessel having hologram of diffraction grating formed thereon
AssigneeToyo Seikan Kaisha, Ltd.
InventorsKen Takenouchi, Kazuyuki Kurosawa, Makoto Horiguchi, Tsuneo Imatani, Hideo Kurashima
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Abstract
The metal vessel of the present invention is characterized in that a relief type hologram or relief type diffraction grating is formed on at least a part of the vessel by coining. By forming this hologram or diffraction grating by coining, the dimensional precision or reproducibility of the hologram of diffraction grating is highly improved. The metal vessel having the hologram formed thereon is excellent in the design and decorative characteristics, and in the metal vessel having the diffraction grating formed thereon, changes of the inner pressure can be easily detected by utilizing this diffraction grating.
Claims11
A process for the preparation of a metal vessel with a hologram or a diffraction grating, which comprises
- preparing a metal plate mold having a concave-convex hologram or a diffraction grating formed on a gently curved face convex to the surface, wherein the ratio (P/D) of the diameter (D) of the curved surface to the protrusion height (P) is from 1.0.times.10.sup.-5 to 5.0.times.10.sup.-2 and
- stamping a metal blank or a metal container having a smooth surface with the metal plate mold at room temperature to transfer a relief type hologram or a relief type diffraction grating on the surface of the metal blank or the metal container by plastic deformation of the metal blank or the metal container.
A process for the preparation of a metal vessel with a hologram or a diffraction grating, which comprises
- preparing a deformable thin metal plate mold having a concave-convex hologram or a diffraction grating formed on the surface, supporting the thin metal plate mold on a pressing member through a cushioning layer having a compressive modulus of 1.times.10.sup.6 to 1.times.10.sup.10 Pa and a thickness of 10 to 200 .mu.m,
- stamping a metal blank or a metal container having a smooth surface by the thin metal plate mold through the cushioning layer at room temperature to transfer a relief type hologram or a relief type diffraction grating on the surface of the metal blank or the metal container by plastic deformation of the metal blank or the metal container.
Dependencies are inferred from the claim text.