Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1988-07-05
1992-07-14
Arnold, Bruce Y.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 3, 40152, G02B 532, G09F 112
Patent
active
051308258
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to an arrangement for graphic representation using holographic foils.
So-called holographic foils, i.e., aluminum foils, which exhibit a certain pattern when operated upon by a laser beam are known in the art. Such foils which, for example, are employed in the art for thermal applications, can also be used for the production of other objects. However, it is difficult to inscribe foils of this type.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method which makes it possible to inscribe such foils. Another object of the invention is to produce an image having a holographic effect using the characteristics of foils of this type.
The term "diapositive" in this application is always taken to mean a positive image which is arranged on a light-transmitting carrier. This carrier may consist of glass or synthetic resin and the positive image may be produced by photographic means, printing or drawing.
The invention proposes that the holographic foil not be printed but, instead, that a diapositive be placed on the holographic foil. If this diapositive is placed directly on the holographic foil, that is, without a certain spacing between the same, the impression of a printed object, e.g., a visiting card, rather than a three-dimensional image, is obtained.
In contrast to the normal printing inks applied to holographic foils, the symbols made in this manner are resistant to rubbing and cannot be removed.
If a holographic prism foil is used and the diapositive arranged at a spacing from the holographic prism foil, a holographic effect arises in that the image has many colors because the diapositive receives light from the back and becomes transparent. As a result, it is possible for the first time to distinguish the colors of the diapositive. When the areas of an object which appear white in the image are to be accentuated particularly clearly, it is of value to make these areas white in the diapositive, namely, with an opaque paint, preferably a so-called lime paint.
No special light is required with this technique. Normally, an extra light source is necessary for the reproduction of diapositives in order to project the image. However, the holographic foil, such as a laser foil, returns so much light that normal daylight suffices for viewing of the image.
The foil acts like a mirror but only when the object, e.g., the diapositive, is held at a distance of approximately 1 to 5 mm from the foil. The distance depends upon the sharpness of the diapositive. Similarly to a mirror, one sees the image behind the foil and not, as for a reproduction on paper, on the paper.
The arrangement according to the invention makes it possible to achieve surprising effects which have not been recognized by the art until now and not only lead to entirely new technical possibilities but also open up a wide range of artistic possibilities.
BRIEF DESCRIPTION OF THE DRAWING
In order to further explain the subject matter of the invention, the accompanying drawing illustrates an arrangement for the production of an image having a holographic effect.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the drawing, 1 identifies a cardboard forming part of a holographic member or support which further comprises a holographic prism foil 6. A carrier 2 here shown as a frame-like element of predetermined thickness (approximately 5 mm) is disposed in front of this cardboard 1 and has an appropriate opening 7 which transmits light and through which the holographic prism foil 6 is visible. An image-bearing transparency 3, preferably a colored diapositive, is arranged on the carrier 2 in front of this opening and is surrounded by a so-called mount 4. The whole is then covered with a transparent sheet in the form of a glass plate 5 held in a frame 8.
In this arrangement according to the invention has the advantage that the diapositive 3 is exposed to light, i.e., illuminated, from the back so that the true colors of the diapositive appear.
In order that the normally white regions
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"Formation of Optical Elements by Holography", Sincerbox, IBM Technical Disclosure, vol. 10, No. 3, Aug. 1967, pp. 267-268.
Magarinos, Jose R. and Coleman, Daniel J., "Holographic Mirrors", Optical Engineering, vol. 24, No. 5 (Sep./Oct. 1985), pp. 769-780.
Arnold Bruce Y.
Nguyen Thong
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