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| Holographic puzzle |
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| Segmented hologram for multi-image display |
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| Heads-up and heads-down displays employing holographic stereograms |
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| Seam structure of rubber sheets |
| OF THE PREFERRED EMBODIMENT Referring to FIG. 3 of the drawings, a seam structure 30 of connecting ... |
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| Holographic method and apparatus using incoherent light |
| This object is achieved by the invention by means of a method of generating a quasi-complex ... |
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Hologram and method of and apparatus for producing the same
| Details |
Inventors: Suga, Kazuhiro; Sekiguchi, Atsushi; Ueda, Kenji; Nishimura, Hiroyuki;
Assignee: Dai Nippon Printing Co., Ltd. (Tokyo, JP)
Primary Examiner: Bowers, Jr.; Charles L.
Assistant Examiner: Angebranndt; Martin J.
Attorney, Agent or Firm: Dellett and Walters
A duplicating photosensitive material film is placed into close contact with a thin flexible ND glass or an ND glass coated with a cushioning layer through an optical contacting liquid containing a surface active agent. A spacer is interposed between a hologram original plate and the duplication photosensitive material, and the space defined by the spacer is filled with an optical contacting liquid, the spacer thereby regulating the thickness of the optical contacting liquid layer. In addition, a cushioning layer is provided on the inner side of an AR coated ND glass or on the upper side of the photosensitive material film, and another cushioning layer is provided on the side of an original plate protecting glass of the hologram original plate which is closer to the optical contacting liquid or on the lower side of the photosensitive material film. With this arrangement, even if dust enters, it can be effectively held inside the cushioning layers. Thus, it is possible to prevent undesirable flow of the optical contacting liquid and lifting of the film due to dust and hence possible to perform duplication effectively without any hindrance. |
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DETAILED DESCRIPTION It is an object of the present invention to provide a hologram in which the optical contacting liquid is made uniform and thin in thickness and which can be duplicated without any hindrance even if a foreign substance is mixed in.
It is another object of the present invention to provide a method of and apparatus for producing a hologram, whereby the optical contacting liquid is made uniform and thin in thickness and a hologram can be produced without any hindrance even if a foreign substance is mixed in.
It is still another object of the present invention to make it possible to prevent mingling of air during production of a hologram.
It is a further object of the present invention to allow an optical contacting liquid to become uniform in thickness within a short time and to enable a hologram to be produced excellently and efficiently.
To these ends, the present invention provides a hologram produced by applying laser light split into two beams to a recording unit including a photosensitive material film placed in close contact with an anti-reflection coated glass or an ND (Neutral Density) glass or an anti-reflection coated ND glass through an optical contacting liquid.
In this arrangement, a cushioning layer made principally of a polymer of high elasticity is provided either on the side of the anti-reflection coated glass or ND glass or anti-reflection coated ND glass which is closer to the film or on the side of the film which is closer to the glass so that a mingling foreign substance is buried in the cushioning layer, thereby reducing the incidence of depression-shaped defects.
In addition, the present invention provides a duplicate hologram which is recorded on a duplicating photosensitive material film by applying laser light to a duplicating system in which an original plate unit, which includes an original plate hologram supported by a substrate and an original plate protecting glass bonded to the upper side of the original plate hologram, is brought into close contact with a duplicating unit which includes the duplicating photosensitive material film placed in close contact through an optical contacting liquid with an anti-reflection coated glass or an ND glass or an anti-reflection coated ND glass or an ND glass placed in close contact with an anti-reflection coated glass through an optical contacting liquid
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Optical Systems 
