JPS63287984A - Hologram - Google Patents

Abstract

PURPOSE:To obtain a hologram which is easy to handle and has high value as an image by fixing a light reflective member integrally to the deep side of a hologram grating. CONSTITUTION:A colored printing part 105 subjected to printing of, for example, blue, red, yellow, etc., is formed as the light reflective member on a supporting member 103 such as paper. The colored part functions as a colored background if the reflectivity as the spectral luminous efficiency thereof is >=1%. The hologram grating 101 formed on a transparent substrate is stuck by a transparent adhesive agent 104 onto this printing part 105. A luminous flux 2 of a white light source 1 is reflected and diffracted by the grating 101 and a three- dimensional image 6 superposed with the colored part 105 is observed by an observer in this constitution. The hologram is, therefore, integrated with the background. The hologram which is easier to handle and is capable of displaying the excellent image by the background is thus obtd.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a hologram that displays an image that can be observed with the naked eye, particularly under general illumination such as a light bulb, indoor lighting, sunlight, etc.
The present invention relates to holograms that display images using reflected and diffracted light.

(Prior Art) Among holograms used for image display, holograms using reflective volume diffraction gratings (hereinafter referred to as Lippmann holograms) are not significantly affected by the position of the light source and the 1-spectrum energy distribution. Good three-dimensional images can be obtained without any problems.

In addition, it has many advantages such as not only monochromatic images such as green, blue, and red, but also gold, silver, or full-color three-dimensional images with high quality, and a wide range of images (visual range). It has its advantages.

Conventionally, silver salt photosensitive materials have often been used to form these Lippmann holograms, but in recent years, dichromate gelatin photosensitive materials and polyvinylcarbazole-based hologram photosensitive materials have been put into practical use, providing holograms with high diffraction efficiency and transparency. As a result, the quality of displayed images has been improved.

(Problem to be solved by the invention) However, as the transparency of Lippmann holograms has improved, it has become possible to express expressions like '+', which could not be achieved with Soppmann holograms using conventional silver salt photosensitive materials. It's here.

For example, if a highly transparent hologram that produces a bright green reconstructed image is placed on a dark blue background, the bright parts of the reconstructed image will be bright (strongly yellowish) lu color, while the dark parts of the reconstructed image will be , a deep bluish-green, and in between, greens with various brightnesses and hues, creating a work with a deep sea-like atmosphere that takes on a variety of expressions depending on the season and time of day.

Conventionally, in order to achieve such an exhibition effect, a configuration as shown in FIG. 8 has been used. A light beam 2 from the illumination source is reflected and diffracted by the hologram 7-to-i to produce a light beam 3. When the observer 4 observes this light flux, a three-dimensional reconstructed image 6 is observed.

At this time, since the hologram grating 101 has a high transmittance,
The back [200] is illuminated with illumination light 2, and the colored lights and patterns of the background are observed at the same time, and only then can a beautiful image 6 be obtained. At this time, the hologram has a transparent substrate 102,
It is composed of a hologram grating 101, a transparent adhesive 104, and a transparent cover plate 105.

Although it is possible to display a predetermined image in this conventional example, since the hologram and the background are constructed as separate members, it is inconvenient to handle; There were drawbacks such as the possibility of an increase in price or loss of display effects due to inadvertent combination with other backgrounds.

An object of the present invention is to provide a means for reliably achieving effective display while preventing the inconvenience in handling and the increase in price that the conventional examples have.

(Means for Solving the Problems) The objects of the present invention as described above are achieved by the present invention described below.

That is, the present invention provides a hologram that displays an image by reflecting and diffracting a light beam from a visible light source and has a light-transmissive hologram grating, in which a light reflective member is integrally fixed to the back side of the hologram grating. It is a hologram that is characterized by the fact that it becomes

(Function) By physically providing a light-reflective member such as a background member or pattern to the hologram grid on the back side of the Noripman hologram, the inconvenience in handling that the conventional example had,
The cost problem is solved and a hologram capable of displaying three-dimensional images with excellent image quality is provided.

(Preferred Embodiments) Next, the present invention will be described in more detail with reference to the accompanying drawings that schematically show preferred embodiments of the present invention.

A first embodiment of the present invention will be described using FIGS. 1 and 2.

FIG. 1 is a sectional view showing a first embodiment of the present invention.

On a support member 103 such as paper, necessary colors 1, for example, h, red, yellow, gray, etc. are printed using printing ink.The hologram grating 101 formed on the transparent substrate 102 is
Jt bright adhesive 104 is attached to the support member 103. Here, as for the color, if the relative luminous efficiency reflectance is 1% or more, it can function as a colored background.

A light beam 2 from a white light source 1 is reflected and diffracted by a hologram grating 101 to become a light beam 3, which is observed by an observer 4 to form a three-dimensional image 6. On the other hand, the hologram grating 101
The light flux that has passed through illuminates the colored printing section 105, and its reflected light is superimposed on the reflected diffracted light 3. This results in a combined color and image.

FIG. 2 is a diagram showing an application example in which the 1gl embodiment of the present invention is applied to the cover of a book.A hologram grid and a substrate 102 are pasted on the colored printing part 105 on the cover 109 of 0 books 99. , a three-dimensional image 6 with an expansion approximately corresponding to the colored portion 105 is (q).

In general, bright colors are often used not only on book covers but also on confectionery packages, pamphlets, commemorative tickets, etc. to make a good impression. On the other hand, in order to give depth to the hologram reproduced image, a relatively bright color is often preferred as the background color. According to the present invention, it is possible to simultaneously satisfy these contradictory demands, and it is possible to provide a hologram image that is highly attractive as a product.

FIG. 3 is a diagram showing a case where a reflective hologram is pasted on a pattern such as a color photograph. Although the photograph 105 is a plane view of the landscape, the island in the three-dimensional reconstructed image 6 appears to jump out into the air.

A second embodiment of the present invention is shown in FIG. 4. In this embodiment,
Transparent substrate 102, hologram grating 101, transparent adhesive layer 1
04, a light reflective member 105 is attached to the back side of the hologram made up of the transparent cover plate 103. With such a configuration, the hologram of the present invention can be easily realized by additional machining compared to the conventional hologram manufactured by one process.

A third embodiment of the present invention will be described with reference to FIG. 5. In this embodiment, a colored cover plate 106 of blue or the like is adhered using a transparent adhesive 104. As the substrate 106, a hologram with high strength and reliability can be realized by using colored glass, a colored plastic plate, an aluminum plate treated with color alumite, or the like having a thermal expansion coefficient matching that of the transparent substrate 102.

A fourth embodiment of the present invention will be described with reference to FIG. 6. This embodiment shows a case where a reflective hologram is used as a floor material on a floor surface. Floor tile 100-1.100-2.
100-3-: transparent substrate 102, hologram grating 10
1. It is composed of a protective layer 103. When constructing this tile on the floor 111, by using adhesive 110 of blue, green, white, etc., this adhesive layer 110
It becomes possible to have the light reflector function. In this case, it is desirable that the illumination light source 1 be attached to the ceiling.

A 7J5 embodiment of the present invention will be described with reference to FIG. 7. In this embodiment, the hologram grating 101 is mechanically protected by a protective layer 107 of a desired color. This protective layer is, for example, a thermosetting adhesive mixed with a blue pigment or dye, and is applied to the surface of the hologram grating 101 by a method such as a bar code method, and then cured by heating. With such a configuration, it is possible to configure a thin and lightweight reflection hologram with a minimum number of parts.

Further, this protective layer 107 can also function as a bonding member with other members, which is highly effective in reducing costs.

Note that this embodiment is particularly suitable for polyvinylcarbazole-based holograms, and in this case, since the hologram material is resistant to moisture, it is possible to use a moisture-permeable protective layer.

(Effects) As described above, in the present invention, when displaying a transparent reflective hologram, anyone can easily handle it by configuring the light reflective member, which was conventionally placed separately, with the hologram, and display it as an image. It becomes possible to construct a hologram with high value.

Further, by configuring the light reflecting member integrally with the hologram grating, it is possible to make the product low-priced.

Furthermore, as a secondary effect, it can also serve to protect the hologram grating against visible light, ultraviolet light, and infrared light incident from the back surface of the hologram, which is a very large advantage.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a hologram according to the first embodiment of the present invention, FIG. 2 is a perspective view of the first embodiment of the present invention used on the cover of a book, and FIG. An example of a pattern according to the first embodiment of the invention, FIG. 4 is a cross-sectional view of a hologram according to the second embodiment of the invention, and FIG. , FIG. 6 is a cross-sectional view of a hologram placed on the floor according to a fourth embodiment of the present invention, FIG. 7 is a cross-sectional view of a hologram according to a fifth embodiment of the present invention, and FIG. 8 is a sectional view of a conventional hologram. FIG. 3 is a cross-sectional view of an example hologram display. 1: Illumination light source 2: Illumination light flux 3: Reflected diffraction light flux 4: Observer 6: Three-dimensional reconstructed image 99: Book 101: Reflective hologram grating 102: Transparent substrate 103: Cover plate (substrate) 104: Adhesive 105: Light Reflective member 106: Light-reflective cover plate 107.110 + light-reflective adhesive 109: Book cover 111: Floor structure 200: Background Patent applicant Ken'Lr Canon Co., Ltd. Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7

Claims (2)

[Claims] (1) A hologram that displays an image by reflecting and diffracting a light beam from a visible light source and has a light-transmissive hologram grating, characterized in that a light reflective member is integrally fixed to the back side of the hologram grating. A hologram. (2) The hologram according to claim (1), wherein the light reflective member has a relative luminous efficiency reflectance of 1% or more.