JPH04237086A - Method and device for reproducing hologram - Google Patents

Abstract

PURPOSE:To optically expose and write the information to be recorded on respective reproduced holograms by utilizing the photosensitivenes of a photosensitive material as the post processing necessary for the stage for producing the reproduced products of the holograms. CONSTITUTION:The information 8 to be reproduced is reproduced by optically contact exposing and thereafter, the additional information 5 is optically recorded by a scanning beam 3 formed by a dot scanning device 2 onto the reproduced holograms 6 of respective exposing regions at the time of reproducing the holograms by subjecting a hologram original plate 8 to optical contact exposing to the photosensitive material film 11.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to a method for mass-producing holograms and an apparatus therefor, and more particularly to a method and apparatus for replicating holograms that are provided with effective means for post-processing of photosensitive materials after exposure duplication. .

0002

[Prior Art] Conventionally, in the optical close copying of holograms, post-processing is performed to add unique information such as a serial number to each duplicate hologram during the manufacturing process, and this is done in a separate process after duplication. This was done by printing out the necessary information, etc.

0003

[Problems to be Solved by the Invention] As mentioned above, in conventional optical close-contact duplication of holograms, it is necessary to go through a printing process for post-processing of necessary information, resulting in the problem of adding one more process. there were.

The present invention was made in view of the above circumstances, and its purpose is to record information to be recorded on each duplicate hologram in the photosensitive material of the photosensitive material as a necessary post-processing in the process of manufacturing hologram duplicates. It is an object of the present invention to provide a method for optically exposing and writing by utilizing the characteristics of the present invention, and a device for the same.

[0005]

[Means for Solving the Problems] A hologram duplication method of the present invention that achieves the above object is a method of duplicating a hologram by optically contacting a hologram original plate with a photosensitive material film, in which information to be duplicated is This method is characterized in that, after duplication by optical contact exposure, additional information is optically recorded on the duplicated hologram of each exposed area.

[0006] In this case, typically, the information additionally recorded on each duplicate hologram is recorded as a hologram, and the information includes a person's name, serial number, etc.

Note that the present invention includes a hologram reproduced by such a method.

[0008] Furthermore, the hologram duplication device of the present invention includes:
In a device that duplicates a hologram by optically contacting a hologram master onto a photosensitive material film, the information to be duplicated is copied by optically contacting, and then the duplicated hologram in each exposure area is scanned by a dot scanning device. This is characterized in that additional information is optically recorded using a beam.

In this case, a typical example is to arrange a reflecting mirror at the additional information recording position on the side of the photosensitive material film opposite to the scanning beam incident side, so that the additional information is recorded as a hologram.

0010

[Operation] In the hologram duplication method of the present invention, after the information to be duplicated is duplicated by optical contact exposure, additional information is optically recorded on the duplicated hologram in each exposure area. Individual information for each duplicate hologram, which was conventionally filled in by printing or the like in a separate process after duplication, can be written at the same time during duplication, making it possible to reduce the number of processes and improve production efficiency. This individual information can also be recorded holographically.
The effectiveness of the hologram for preventing counterfeiting can be improved compared to that of conventional holograms for preventing counterfeiting.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an overall perspective view of an apparatus for actually duplicating a hologram and writing necessary information based on the present invention, and FIG. 2 is an enlarged sectional view of a portion for recording individual information on a duplicate hologram. be. In FIG. 1, a cylindrical original drum 7 is used, a hologram original 8 is stuck therein, a photosensitive material film 11 for duplication is wound around the drum 7, and the drum 7 and film 11 are rotated at the same speed. Cylindrical lens 1 from the material film 11 side
By irradiating the planar copying laser beam 9 spread by 0, the reflected diffraction light from the hologram master 8 interferes with the irradiated light, and the information recorded on the master hologram 8 is transferred to the copying photosensitive material film. 11. Next, each replicated hologram 6 that has been replicated is illuminated by a laser beam 3 oscillated by the laser oscillation device 1 and scanned by two mirrors of the dot scanning device 2.
Necessary and desired information 5 is written into each hologram 6. Examples of such information include personal names, serial numbers, and the like. In FIG. 1, reference numeral 4 indicates a computer for driving the dot scanning device, and the deflection angles of the x-direction scanning mirror and the y-direction scanning mirror of the dot scanning device 2 are controlled by control signals from the computer 4. Necessary information is drawn and recorded on the 11th surface of the film through an imaging lens that does not have an image.

FIG. 2 shows the details of the portion drawn by the laser beam 3. The laser beam 3 passes through the base layer 12 and the sensitive material layer 13 of the photosensitive material film 11 for duplication, and reaches the film 11 at the information writing position. The light hits the mirror 14 placed on the lower side and is reflected. Interference fringes are generated in the sensitive material layer 13 by this incident light and reflected light, and information is written in a Deniszuk type (Lippmann type) hologram.

In the present invention, in addition to recording using the dot scanning device 2 as described above and recording using hologram interference fringes, it is also possible to record by irradiating a laser beam through a mask representing necessary information. It is. Furthermore, instead of using the interference between the reflected diffraction light and the irradiated light as shown in FIG. 1 to perform optical close copying of the hologram original plate 8, as proposed in Japanese Patent Application No. 2-279572, the transmission It can also be applied to cases where interference between secondary light and diffracted light is utilized. To briefly explain this, in FIG. 3, a cylindrical transparent original drum 7' is used, and a hologram original 8 is placed therein.
' is stretched, and the photosensitive material film 11 for duplication is wound around this drum 7', and the drum 7' and the film 11 are rotated at the same speed. By irradiating the planar copying laser beam 9, the transmitted diffracted light from the hologram master plate 8' and the rectilinear light interfere, and the information recorded on the master hologram plate 8' is transferred to the copying photosensitive material film 11. is copied to. Note that writing of necessary information to each hologram is performed in the same manner as in FIGS. 1 and 2.

As a specific example, a silver halide roll film SP673T (Ilford) is used to copy the information of the original hologram onto the film using a device such as that shown in FIG. The serial number was recorded in the replica hologram as a Lippmann type hologram. Thereafter, this roll film for duplication was developed with CW-C2 developer, and PBQ-2
After bleaching with a bleaching solution, they were able to obtain a duplicate hologram with the same information and serial number as the original hologram.

Note that the present invention is not limited to the embodiments described above, and various other modifications are possible.

[0017]

As explained above, according to the hologram duplication method of the present invention, after the information to be duplicated is duplicated by optical contact exposure, additional information is optically added to the duplicated hologram in each exposure area. Since the hologram is recorded, the individual information for each replicated hologram, which was conventionally filled in by printing in a separate process after duplication, can be written at the same time during duplication, reducing the number of processes and improving production efficiency. can. Furthermore, this individual information can be recorded holographically, making it more effective than conventional counterfeit prevention holograms.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view of one embodiment of an apparatus for actually duplicating a hologram and writing necessary information based on the present invention.

FIG. 2 is an enlarged cross-sectional view of a portion where individual information is recorded in the duplicate hologram of FIG. 1;

FIG. 3 is a diagram for explaining the configuration of another example of a hologram duplication device.

[Explanation of symbols]

1...Laser oscillation device 2...Dot scanning device 3...Laser beam 4...Dot scanning device driving computer 5...
Recorded information 6...Replication hologram 7...Original drum 8...Hologram original 9...Laser beam for replication 10...Cylindrical lens 11...Photosensitive material film for replication 12...Base layer 13...Sensitive material layer 14...Mirror

Claims (6)

[Claims] Claim 1: In a method for duplicating a hologram by optically contact exposure of a hologram original to a photosensitive material film, after the information to be duplicated is duplicated by optical contact exposure, the information for the duplicated hologram in each exposed area is A hologram reproduction method characterized by optically recording additional information. 2. The hologram duplication method according to claim 1, wherein the information additionally recorded on each duplicate hologram is recorded as a hologram. 3. The hologram duplication method according to claim 1, wherein the information additionally recorded on each duplicated hologram is a person's name, a serial number, etc. 4. A hologram reproduced by the method according to any one of claims 1 to 3. 5. In an apparatus for duplicating a hologram by optically contact exposure of a hologram original plate to a photosensitive material film, after the information to be duplicated is duplicated by optical contact exposure, A hologram duplication device characterized in that additional information is optically recorded by a scanning beam from a dot scanning device. 6. The hologram according to claim 5, wherein the additional information is recorded as a hologram by disposing a reflecting mirror on the opposite side of the scanning beam incident side of the photosensitive material film at the additional information recording position. Replication device.