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| Optical pickup using an optical phase plate |
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Plastic molding of articles including a hologram or other microstructure
| Details |
Inventors: D'Amato, Salvatore F.; Mallik, Donald W.;
Assignee: American Bank Note Holographics, Inc. (Elmsford, NY)
Primary Examiner: Lowe; James
Assistant Examiner:
Attorney, Agent or Firm: Majestic, Parsons, Siebert & Hsue
A technique for forming a mold to replicate large numbers of plastic articles, such as by injection or blow molding, wherein the mold contains a hologram or other microstructure for transfer to an outside surface of the molded article. The mold is made by electrodepositing a metal on a model of the article to be molded. Before this deposition, the hologram or other microstructure is formed on a surface area of the model by any one of several techniques. The result is a unitary mold piece in the shape of the article and having the hologram or other microstructure integrally formed on its inside surface. |
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DETAILED DESCRIPTION These and additional objects are accomplished by the various aspects of the present invention wherein, briefly and generally, a mold is formed by electrodeposition onto a model of an object to be molded, or a portion of the model's surface, after the model surface has been provided with a surface relief pattern of a hologram, diffraction grating or other microstructure.
The result is a mold element both in the shape of the model to be molded and including a replica of the surface relief pattern as a single integral part.
The surface relief pattern is included in the mold wall just as any other surface irregularity of the model is included when the mold is formed by electrodeposition over the model.
The molding operation is then accomplished in the same manner as it would be if plastic pieces of the model were being formed without the surface relief pattern.
No separate piece is required to be inserted into the mold in order to mold the article with the surface relief pattern on it.
According to a first embodiment of this invention, a model of an object to be replicated by plastic molding is first formed, followed by firmly attaching a film replica of a hologram, diffraction grating or other microstructure to the surface of the model.
The model will typically be of a three-dimensional object to be molded, such as the plastic bottle cap example referred to above.
Often, the film will be attached to only a portion of the surface of the model.
The technique allows attaching more than one piece of film to be attached to various different areas of the model, thus allowing different hologram images or light patterns to be viewed in light reflected from different portions of the model.
The flexible nature of the film allows it to conform to a three-dimensional surface shape of the model.
After a model is so constructed, a mold piece conforming to the outside shape of at least a portion of the model is then formed by electrodeposition of metal over the model surface including portions occupied by one or more pieces of film and portions which have no film attached
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Optical Systems 
