Radiation imagery chemistry: process – composition – or product th – Holographic process – composition – or product
Reexamination Certificate
1999-05-26
2001-09-18
Angebranndt, Martin (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Holographic process, composition, or product
C430S002000, C359S001000, C359S012000
Reexamination Certificate
active
06291109
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a hologram and a method of and apparatus for producing the same. Here, it should be noted that the term “produce” as used in the present invention includes “duplicate”.
More specifically, the present invention relates to 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 glass or an anti-reflection coated ND glass through an optical contacting liquid, and also relates to a method of producing the hologram.
A hologram original plate has heretofore been duplicated by applying a laser beam to the hologram original plate placed in close contact with a photosensitive material so that diffracted light from the original plate and the incident light interfere with each other in the photosensitive material, thereby recording a hologram image of the original plate in the photosensitive material. In this process, in order to prevent the disorder of the image due to the back reflection component, an optical contacting liquid that is substantially equal to the original plate in refractive index is interposed between the original plate and the photosensitive material, thereby enhancing the adhesion and preventing back reflection during the duplication of the hologram image.
Incidentally, the optical contacting liquid, which is interposed between the glass and the photosensitive material film, is difficult to apply with a uniform thickness because of fluidity, vibration, etc. In particular, when a large amount of contacting liquid is applied, it is likely to take a long time from the application of the liquid to the settlement of its flow, which interferes with the production of a hologram. In addition, even if production or duplication of a hologram is carried out in a clean room, it is impossible to completely eliminate foreign substances (dust) of the order of 10 &mgr;m in diameter which are carried in from the outside when the operator enters the room, or when the materials are fed in, and attached to the film and/or the glass. Such foreign substances undesirably lift the film, resulting in regions where the hologram cannot be recorded due to the flow of the optical contacting liquid around the foreign substances. In addition, since the film is pressed by the foreign substances, the hologram produced or made by duplication is attended with a large number of defects (depression-shaped defects) with which a reconstructed image of the hologram looks as if there were depressions of the order of several hundred &mgr;m to several mm in diameter.
SUMMARY OF THE INVENTION
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. In this arrangement, a cushioning layer made principally of a polymer of high elasticity is provided either on the side of the original plate protecting glass which is closer to the duplicating unit or on the side of the duplicating photosensitive material film which is closer to the original plate unit so that a foreign substance which may mingle during duplication is buried in the cushioning layer, thereby reducing the incidence of depression-shaped defects.
In addition, the present invention provides a method of producing a hologram 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 glass or an anti-reflection coated ND glass through an optical contacting liquid. In this method, 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 foreign substance which may mingle during the production of the hologram is buried in the cushioning layer, thereby reducing the incidence of depression-shaped defects.
In addition, the present invention provides a hologram producing method in which an image of an original plate hologram is recorded on a duplicating photosensitive material film by applying laser light to a duplicating system in which an original plate unit, which includes the 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. In this method, a cushioning layer made principally of a polymer of high elasticity is provided either on the side of the original plate protecting glass which is closer to the duplicating unit or on the side of the duplicating photosensitive material film which is closer to the original plate unit so that a foreign substance which may mingle during duplication is buried in the cushioning layer, thereby reducing the incidence of depression-shaped defects.
In addition, the present invention provides a hologram producing apparatus including a device for supplying a duplicating film, a device for dropping or coating a contacting liquid on a hologram original plate supported by a support and on the duplicating film, and a roller for smoothing the supplied contacting liquid. The apparatus further includes a device for pressing a flexible layer against the film through the contacting liquid, a laser light source for applying laser light from above the flexible layer, and a device for drying t
Nishimura Hiroyuki
Sekiguchi Atsushi
Suga Kazuhiro
Ueda Kenji
Angebranndt Martin
Dai Nippon Printing Co. Ltd.
Dellett and Walters
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