Optical: systems and elements – Holographic system or element – Having particular recording medium
Patent
1991-08-29
1993-03-09
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Having particular recording medium
359 1, G03H 104
Patent
active
051930145
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Background
The present invention relates to a metal vessel having a relief type hologram or relief type diffraction grating formed on the surface, and also to a process for the production thereof.
2. Conventional Technique
The hologram is characterized in that a three-dimensional image can be easily reproduced and an iridescent decorative effect can be manifested. Accordingly, the hologram is utilized in the field of display for gifts, novelties and children's toys or in the field of publishing and printing for books, magazine front pages and cut-in illustrations.
Furthermore, multiplex recording or high-density recording is made possible by the hologram, and the hologram is used as a light memory. Since a precision machine is necessary for the formation of a hologram and forgery is difficult, the hologram is utilized for securities, credit cards and ID cards.
The formation of a hologram on a packaging material or a vessel has already been proposed. For example, Japanese Unexamined Utility Model Publication No. 62-143663 discloses a vessel comprising a packaging material having a hologram formed on a part or all of the surface of a substrate, and Japanese Unexamined Utility Model Publication No. 63-70934 discloses a transparent cylindrical vessel having a multiplex hologram formed on the inner side or outer side of a vessel lid.
As the means for reproducing the hologram, there is known a process in which a photosensitive material is used and a hologram is directly formed by light exposure and interference, and a process in which a smooth plastic material is embossed to form a surface relief type hologram.
For forming a hologram on a vessel, it is considered that there can be adopted a method in which a hologram is directly formed on the side face of the vessel, and a method in which a hologram is formed on a seal or label and this seal or label is bonded to the side face of the vessel. These methods, however, have the following defects.
Namely, according to procedures adopted at the present, a convex-concave hologram formed on the surface of a tool is transcribed in the melted state in the form of a relief on the surface of plastics. In the plastics, the difference between the density in the melted state and the density at room temperature is large and the shrinkage tendency is conspicuous, and the dimensional precision is low and the reproducibility of a fine pattern is poor. Furthermore, the hologram is readily deformed by the internal strain generated at the molding. For directly forming a hologram on the side face of a vessel, a concave-convex face for forming a hologram is formed on a mold face in advance. Even though the vessel wall being swollen by blow forming, air-pressure forming or the like is in the melted state, in case of a hollow-formed vessel which is immediately cooled and solidified on the contact with the surface of the mold, it is very difficult to faithfully form a relief type hologram. On the other hand, the method in which a seal or label is bonded is defective in that the troublesome bonding operation should be carried out in addition to the vessel-forming operation, and the hologram is not integrated with the vessel.
SUMMARY OF THE INVENTION
It was surprisingly found that if a substantially flat plate having a concave-convex hologram formed thereon and a metal blank having a smooth surface are subjected to coining in the direction orthogonal to the surface, a relief type hologram can be transferred on the surface of the metal blank, and the formed hologram is prominently excellent in the dimensional precision and reproducibility of a concave-convex pattern and the strength and durability of the hologram.
It also was found that if a flat plate having a diffraction grating formed thereon is subjected to coining in the same manner as described above, a relief type diffraction grating can be formed on the surface of a metal blank, and in a metal vessel prepared by using a metal blank having a relief type diffraction grating thus formed, the change of the in
REFERENCES:
patent: 4725111 (1988-02-01), Weitzen et al.
Horiguchi Makoto
Imatani Tsuneo
Kurashima Hideo
Kurosawa Kazuyuki
Takenouchi Ken
Arnold Bruce Y.
Ryan J. P.
Toyo Seikan Kaisha Ltd.
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