JPH06118861A - Duplication of lippmann hologram - Google Patents

Abstract

PURPOSE:To enable the stable mass production of Lippmann holograms of original plates varying in sizes from a rotary drum at a high speed. CONSTITUTION:This process for duplication of the Lippmann holograms consists in continuously duplicating the Lippmann holograms by sticking the Lippmann holograms as the original plates to the rotary drum 11, bringing a photosensitive material film 15 for duplication into tight contact with the rotary drum 11, nearly matching the rotating speed of the rotary drum 11 and the feed speed of the photosensitive material film 15 for duplication and irradiating the film with a laser beam spread to a slit shape in the direction parallel with the axis of rotation of the rotary drum 11. The films of the thickness nearly equal to or slightly smaller than the thickness of the original plate films are stuck to the surplus parts of the original plates 12 in the outer peripheral direction of the rotary drum and the surplus parts of the original plates 12 in the rotating axis direction of the rotary drum and the Lippmann holograms are continuously recorded on the photosensitive material film 15 for duplication.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of replicating a Lippmann hologram by using a rotating drum, and more particularly to a method of replicating a Lippmann hologram which enables mass production of Lippmann hologram at high speed and stably. .

[0002]

2. Description of the Related Art Conventionally, as a method of replicating a Lippmann hologram using a rotating drum, a Lippmann hologram is pasted on a rotating drum as an original plate, a photosensitive material film for duplication is adhered to the rotating drum, and the rotating drum is rotated. The speed and the feeding speed of the duplicating photosensitive material film are made to substantially coincide with each other, and a laser beam expanded in a slit shape is irradiated from the duplicating photosensitive material film side in a direction parallel to the rotation axis of the rotating drum to continuously perform Lippman. Methods of replicating holograms have been adopted.

The original used in such a method of replicating a Lippmann hologram must be of substantially the same size as the rotating drum.

By the way, when a hologram is actually copied, some originals may be simultaneously stuck on a rotary drum, or the size of the original may be smaller than that of the rotary drum.

However, such a hologram is
If the conventional method is used, the Lippmann hologram cannot be stably copied.

That is, as shown in the sectional view of the rotating drum of FIG. 5, when the original 2 of the Lippmann hologram is smaller than the rotating drum 1, when the duplicating photosensitive material 3 is brought into close contact with the original 2, the original 2 A space 4 equal to the thickness is created.

In this way, the original 2
When the size is small, air bubbles enter into the space 4 when copying is performed. Further, since the pulling force on the duplication photosensitive material 3 is not uniform, wrinkles occur near the space 4 of the duplication photosensitive material 3. Then, due to the bubbles and wrinkles, the image is lost, and it becomes difficult to stably reproduce the Lippmann hologram.

[0008]

As described above, in the conventional method of replicating a Lippmann hologram, it is difficult to perform stable replication except for an original plate having a size substantially equal to the size of the rotating drum. There was a problem.

The present invention has been made in order to solve the above-mentioned problems, and is extremely reliable in that it enables mass replication of original Lippmann holograms of different sizes from those of a rotating drum at high speed and stably. An object is to provide a method of reproducing a high Lippmann hologram.

[0010]

In order to achieve the above object, in the present invention, a Lippmann hologram is pasted as an original plate on a rotating drum, a photosensitive material film for duplication is brought into close contact with the rotating drum, and the rotating speed of the rotating drum is increased. And the feed speed of the duplication photosensitive material film are made to substantially coincide with each other, and laser light spread in a slit shape is irradiated from the duplication photosensitive material film side in a direction parallel to the rotation axis of the rotating drum to continuously produce a Lippmann hologram. In the method of replicating a Lippmann hologram, the original film is attached to the rotary drum of the original plate when the original plate is attached to the rotary drum, and in a part of the original plate which is left in the rotary drum rotation axis direction. A film with a thickness almost equal to or slightly smaller than It is to record the use photosensitive material film.

Here, the cut portion is formed by leaving a gap of a predetermined size between one end of the film to be attached to the remaining portion of the original plate in the direction of the rotary drum rotation axis and the other in the outer circumferential direction of the rotary drum. .

Further, the cut portion is formed at an appropriate angle with respect to a line parallel to the rotation axis of the rotary drum.

Further, a photopolymer is used as the above-mentioned duplicating photosensitive material film.

[0014]

Therefore, in the method of replicating the Lippmann hologram of the present invention, when the original plate is attached to the rotating drum,
By continuously sticking a film with a thickness almost equal to or slightly thinner than the original film to the remaining part of the original drum in the outer peripheral direction of the rotating drum and the remaining part of the original plate in the rotating direction of the rotating drum, It becomes possible to record the Lippmann hologram on the photosensitive material film for reproduction at high speed and stably.

Thus, even when several original plates are attached to the rotary drum at the same time, or even when the size of the original plate is smaller than that of the rotary drum, it is possible to easily perform mass replication of the original plate.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

The method of replicating the Lippmann hologram according to this embodiment is performed as follows.

That is, first, as shown in FIG. 1, the original 12 of the Lippmann hologram is attached to the rotary drum 11, and the laser light emitted from the laser 13 is made parallel to the rotation axis of the rotary drum 11 by the cylindrical lens 14. It is spread out in a slit shape and irradiated on the rotary drum 11.

In this case, the duplicating photosensitive material film 15
Is subjected to liquid immersion for index matching with the original plate 12, so that the liquid is passed through the liquid immersion roll 16 and the impression roll 17, and the nip roll 18 is attached to the rotary drum 11.
To adhere more closely.

Here, a photopolymer is used as the duplication photosensitive material film 15, and an isobar is used as the liquid for index matching.

Next, as shown in FIG. 2, the rotary drum 11
The original plate 12 is adhered to, and a film 19 having a width substantially equal to that of the original plate 12 and a thickness substantially equal to or slightly smaller than that of the original plate 12 is adhered to an extra portion of the original plate 12 in the outer peripheral direction of the rotary drum 11. .

Films 20 and 21 having a thickness substantially equal to or slightly smaller than that of the original 12 are attached to a portion of the original 12 that is left in the direction of the rotation axis of the rotary drum 11.

That is, as shown in the development view on the surface of the rotary drum in FIG. 3, a film 19 is attached to the remaining portion of the original drum 12 in the outer peripheral direction of the rotary drum 11, and the film is attached in the direction of the rotary shaft of the rotary drum. The films 20 and 21 are attached to the remaining portions.

At this time, the cut portions 22 and 23 are formed with a predetermined gap between one end and the other end of the films 20 and 21 in the outer circumferential direction of the rotary drum 11.

As a result, the rotary drum 1 shown in FIG.
Bubbles mixed in when the original plate 12 and the photosensitive material film for duplication 15 are brought into close contact with each other are extruded outward along the cut portions 22 and 23 by the nip roll 18 and the nip roll 18.

Further, as shown in the sectional view of the rotary drum of FIG. 4, the original plate 12 is attached to the rotary drum 11, and the original plate 12 is attached.
The films 20 and 21 having an appropriate thickness, which are slightly thinner than the original plate 12, are attached to the periphery of the film.

As a result, the duplication photosensitive material film 15 is formed.
When it is brought into close contact with the original plate 12, it can be surely brought into close contact with the original plate 12, and stable replication can be realized.

As described above, in this embodiment, the Lippmann hologram 12 is used as an original plate and is attached to the rotating drum 11, and the photopolymer film for duplication 15 made of photopolymer is adhered to the rotating drum 11, and the rotating speed of the rotating drum 11 is increased. And the feeding speed of the duplication photosensitive material film 15 are made to substantially coincide with each other, and a laser beam spread in a slit shape in a direction parallel to the rotation axis of the rotating drum 11 is irradiated from the duplication photosensitive material film 15 side to continuously. In the method of replicating a Lippmann hologram in which the Lippmann hologram is replicated in, when the original 12 is attached to the rotating drum 11,
A film 19 having a thickness substantially equal to or slightly smaller than that of the original 12 is attached to an extra portion of the original 12 in the outer peripheral direction of the rotary drum 11, and an extra portion of the original 12 in the rotational axis direction of the rotary drum 11. The films 20 and 21 each having a thickness almost equal to or slightly smaller than that of the original 12 are provided with a predetermined gap between one end of the rotary drum 11 in the outer peripheral direction and the other, and The cut portions 22 and 23 are formed and attached at an appropriate angle with respect to a line parallel to the rotation axis of, and Lippmann holograms are continuously recorded on the duplication photosensitive material film 15. .

Therefore, it is possible to continuously record the Lippmann hologram on the photosensitive material film 15 for duplication at high speed and stably. This makes it possible to attach several original plates 12 to the rotary drum 11 at the same time, or
Even when the size of 2 is smaller than that of the rotating drum 11, it is possible to easily perform mass replication of the original plate 12.

Further, in the conventional duplication method, since a silver salt photosensitive material is used for the photosensitive material film for duplication, it is necessary to carry out a complicated process such as a developing process after exposure with a laser beam. On the other hand, in the duplication method of the present embodiment, since a photopolymer of the type that records interference fringes by photopolymerization is used, development processing is unnecessary and continuous duplication is facilitated. Further, since the photopolymer has excellent durability against temperature and humidity as compared with the silver salt photosensitive material, it becomes possible to improve the stability, storability and the like of the product.

In the above embodiment, the films 20 and 21 are
The case where the cut portions 22 and 23 are formed with a gap having a predetermined dimension between one end and the other end in the outer circumferential direction of the rotating drum 11 has been described, but this is not an essential requirement for the present invention.

Further, in the above embodiment, the cut portions 22, 2
3 has been described as being formed with an appropriate angle with respect to a line parallel to the rotation axis of the rotary drum 11, but the present invention is not limited to this.

[0033]

As described above, according to the present invention, the Lippmann hologram is used as an original plate and is attached to the rotating drum, and the photosensitive material film for duplication is brought into close contact with the rotating drum, and the rotational speed of the rotating drum and the photosensitive material for duplication. To make the Lippmann hologram continuously duplicated, the feed speed of the film was made to be almost the same, and the laser light spread in a slit shape was irradiated from the film side of the photosensitive material film for duplication in a direction parallel to the rotation axis of the rotating drum. In the method of replicating the Lippmann hologram, when attaching the original plate to the rotating drum,
A film of approximately the same thickness as the original film or slightly thinner than the original film is attached to the remaining part of the original plate in the outer peripheral direction of the rotating drum and the remaining part of the original plate in the direction of the rotary drum rotation axis, and continuous Lippman Since the hologram is recorded on the photosensitive material film for duplication, there is an extremely reliable method for duplicating the Lippmann hologram that can perform large-scale duplication of the original Lippmann hologram of different size from the rotating drum at high speed and stably. Can be provided.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of a method of replicating a Lippmann hologram according to the present invention.

FIG. 2 is a perspective view showing a method of replicating a Lippmann hologram in the embodiment.

FIG. 3 is a development view showing a method of replicating a Lippmann hologram in the embodiment.

FIG. 4 is a sectional view showing a method of replicating a Lippmann hologram in the example.

FIG. 5 is a cross-sectional view for explaining a problem in a conventional Lippmann hologram duplication method.

[Explanation of symbols]

11 ... Rotating drum, 12 ... Original plate, 13 ... Laser, 14
... Cylindrical lens, 15 ... Duplicate photosensitive material film, 16 ... Immersion roll, 17 ... Impression roll, 18 ... Nip roll, 19 ... Film, 20 ... Film, 21 ... Film, 22 ... Cutting part, 23 ... Cutting part.

Claims (4)

[Claims] 1. A Lippmann hologram as an original plate is attached to a rotating drum, a photosensitive material film for duplication is brought into close contact with the rotating drum, and the rotation speed of the rotating drum and the feed speed of the photosensitive material film for duplication are made substantially equal. In the method of duplicating a Lippmann hologram, a laser beam spread in a slit shape is irradiated in a direction parallel to the rotation axis of the rotating drum from the film side of the duplicating photosensitive material to continuously duplicate the Lippmann hologram. When the original plate is attached to the rotary drum, a portion of the original plate that is left in the outer circumferential direction of the rotary drum and a portion that is left in the direction of the rotary drum rotation axis of the original plate have a thickness almost equal to or slightly smaller than that of the original film. A thin film is attached, and Lippmann hologram is continuously recorded on the film of the photosensitive material for reproduction. Lippmann hologram method of replication, characterized in that it was so. 2. A cut portion is formed by leaving a gap of a predetermined size between one end of the film to be attached to the extra portion of the original plate in the rotary drum rotation axis direction in the outer peripheral direction of the rotary drum and the other. The method for replicating a Lippmann hologram according to claim 1. 3. The method of replicating a Lippmann hologram according to claim 2, wherein the cut portion is formed at an appropriate angle with respect to a line parallel to the rotation axis of the rotary drum. 4. The photosensitive material film for reproduction includes:
The method for replicating a Lippmann hologram according to claim 1, wherein a photopolymer is used.