JPS6160434B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for simultaneously replicating multiple holograms.

The present invention aims to provide an improved multiple hologram replication technique. DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail together with the prior art with reference to the drawings.

FIG. 1 is a configuration diagram showing an example of a recording optical system for producing a conventionally known hologram recording plate.

In the figure, a parallel laser beam 1 illuminates an information plate 2, and then is condensed by a Fourier transform lens 3, and is collected together with a coherent reference beam 4 on a hologram recording plate.
A predetermined portion of _B0 is exposed. The hologram recording plate B ₀ is intermittently rotated by a driving source 6 about an axis 5 perpendicular to the hologram recording plate B ₀ . Then, by repeating the following operations (rotation of the hologram recording plate B ₀ ) → (rest of the hologram recording plate B ₀ ) → (exposure), the information plate 2 is placed at a predetermined location along the periphery of the hologram recording plate B ₀ . A plurality of hologram latent images are formed based on the information.
Thereafter, by performing processing according to the type of hologram recording plate _B0 , a plurality of holograms 7 are formed at predetermined locations along the periphery at equal intervals as shown in FIG.
An original hologram recording plate _B1 on which is recorded is produced. Note that hereinafter, the hologram recording plate on which the hologram 7 is directly formed from the information plate 2 will be particularly referred to as the original hologram recording plate _B1 .

Original hologram recording plate produced in this way
The reproduction of B ₁ is performed by copying the original hologram recording plate B ₁ into a third
As shown in the figure, a new hologram recording plate to be duplicated (hereinafter referred to as hologram recording plate B ₂ ) is exposed to parallel copying light 8,
It can be obtained by appropriate processing such as development and fixing. In this case, the most preferable result is obtained when the copy light 8 is irradiated from the direction in which the hologram on the original hologram recording plate _B1 is reproduced. For more information on this topic, see Trans.
It is described in IECE'76/7 Vol.59-C No.7 (443p-450p). To summarize, the above reason is that duplication by this method produces an interference pattern between the first-order diffracted light 9 reproduced by the copy light 8 and the zero-order light 10 which is the transmitted light, as shown in FIG. This is due to the fact that this is performed by being recorded on the holographic recording plate _B2 .

Therefore, in order to successfully reproduce a plurality of holograms by one exposure with parallel copying light, all holograms on the original hologram recording plate _B1 must be exposed by copying light irradiated from the same direction. This means that it must be recorded so that it can be played back. However, since the hologram 7 recorded by the conventional technique shown in FIG. 1 was recorded while rotating the hologram recording plate _B0 , each hologram was recorded with the reference beam 4 from a different direction. This means that it has been done. Therefore, if you try to obtain a copy using copy light uniformly irradiated from the same direction, some holograms will appear whose direction does not match the copy light, and some of the copied holograms will have degraded image quality. This may cause the inconvenience of being included. Due to the above circumstances, in order to reproduce holograms with good image quality from the original hologram recording plate B ₁ produced using conventional technology, complicated methods such as irradiating copy light from an appropriate direction for each hologram are required. work must be done.

The present invention provides a method for replicating multiple holograms that eliminates the above-mentioned drawbacks.

FIG. 5 is a configuration diagram showing an example of a recording optical system for producing a hologram recording plate according to the present invention.

The embodiment of the present invention shown in FIG. 5 includes the same constituent members as those of the prior art shown in FIG. 1, so the same reference numerals are given to the members in the description.

In the figure, the surface of the hologram recording plate _B0 is arranged perpendicular to the reference beam 4. The hologram recording plate B ₀ is intermittently rotated by a drive source 6 about an axis 5 parallel to the reference beam 4 as the rotation center. Then, a plurality of holograms containing information on the information plate 2 are obtained at predetermined positions on the hologram recording plate _B0 surface. Since the hologram recording plate B ₀ is arranged perpendicularly to the reference beam 4, a large number of holograms produced by rotating the hologram recording plate B ₀ around the axis 5 are all directed in the same direction, that is,
Recording is performed using a reference beam from a direction perpendicular to the hologram recording plate _B0 . Therefore, each hologram obtained in this way is all on the original hologram recording plate.
It can be reproduced by a copy light perpendicular to _B1 .

Using the configuration shown in FIG. 5, in order to obtain a copy of each hologram recorded on the original hologram recording plate _B1 , the hologram recording plate to be copied must be
The original hologram recording plate _{B 1 is} brought into close contact with the original hologram recording plate B ₁ , and as shown in FIG _. The hologram recording plate B ₂ is irradiated through all the holograms 7 .

In this way, on the hologram recording plate _B2 ,
A plurality of holograms recorded on the original hologram recording plate _B1 can be simultaneously duplicated with good image quality.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a recording optical system for creating an original hologram recording plate according to the prior art, FIG. 2 is a plan view of the original hologram recording plate, and FIG. Side view showing the relationship between the hologram recording plate, copy light, etc., 4th
This figure is a diagram explaining the situation when copying light is irradiated onto the original hologram recording plate, and FIG. 5 is a configuration diagram showing a recording optical system for producing the original hologram recording plate according to the present invention. 4...Reference light, 5...Axis, 7...Hologram, 8...Copy light, _B1 ...Original hologram recording plate, _B2 ...Hologram recording plate.

Claims (1)

[Claims] 1. By placing the original hologram recording plate surface perpendicular to the reference beam and rotating the original hologram recording plate around an axis parallel to the reference beam, multiple holograms are placed at predetermined positions on the original hologram recording plate surface. The original hologram recording plate and the target hologram recording plate to be copied are brought into close contact with each other, and the target hologram is recorded through the original hologram recording plate by parallel copying light irradiated perpendicularly to the original hologram recording plate. A method for duplicating a plurality of holograms, characterized in that a plurality of holograms recorded on an original hologram recording plate are simultaneously duplicated on a hologram recording plate by irradiating the plate.