JP3367710B2 - Hologram manufacturing method, manufactured hologram, and hologram manufacturing apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram manufacturing method, a manufactured hologram and a hologram manufacturing apparatus.

[0002]

2. Description of the Related Art A hologram original plate and a photosensitive material are brought into close contact with each other, and a laser beam is irradiated to cause the diffracted light from the original plate and the incident light to interfere with each other in the photosensitive material to record a hologram image of the original plate in the photosensitive material. The hologram original plate has been duplicated. In this case, in order to prevent the disturbance of the image due to the reflection component on the back surface of the photosensitive material, an optical contact liquid having substantially the same refractive index is interposed between the original plate and the photosensitive material to improve adhesion and prevent back surface reflection. I am trying to duplicate the hologram image.

[0003]

By the way, the glass and the photosensitive material film are brought into close contact with each other through the optical contact liquid both in the replicated part and between the original plate and the photosensitive material. The optical contact liquid interposed between the films is difficult to have a uniform thickness due to fluidity and vibration,
In particular, when the amount of the contact liquid is large, it may take time for the flow to subside and become stable after coating, which causes a problem in producing the hologram. Further, even if the hologram is produced in, for example, a clean room, the hologram is brought in from the outside when the worker enters the room or carries in the material and adheres to the photosensitive material film or glass.
It is impossible to completely remove foreign matter (dust) having a diameter of about μm. When a hologram is duplicated with such foreign matter attached to the photosensitive material film or glass, the foreign matter partially lifts the photosensitive material film and the hologram cannot be recorded due to the flow of the optical contact liquid around the foreign matter. Occurs or the photosensitive material film is pressed by a foreign substance, so that a reproduced image of the reproduced hologram has a large number of places (concave defects) that appear to have dents with a diameter of several hundreds of μm to several mm. There was a problem.
Further, when bubbles are generated between the film and the glass during hologram production, there is a problem that the reproduced image of the portion where the bubbles were present becomes completely defective.

The present invention has been made in order to solve the above problems, and its purpose is to make the optical contact liquid uniform and thin, and cause dust and air bubbles to interfere with the production. It is an object of the present invention to provide a hologram production method, a produced hologram, and a hologram production apparatus that enable the production of a hologram without using the hologram.

[0005]

A method for producing a hologram of the present invention which achieves the above object, comprises a method of producing a two-beam light beam on a recording portion formed by closely adhering a photosensitive material film to a transparent plate or a semitransparent plate through an optical contact liquid. In the method of producing a hologram by irradiating the coherent light divided into two, the surface of the transparent plate or the semitransparent plate in contact with the photosensitive material film, or the surface of the photosensitive material film in contact with the transparent plate or the semitransparent plate fine grooves By engraving, the foreign matter mixed in during hologram production is buried in the groove to reduce the dent-like defects due to the foreign matter, and the bubbles mixed in or generated during hologram production are removed along the groove to eliminate defects caused by bubbles. It is a method characterized by preventing it.

Another method for producing a hologram of the present invention is a transparent plate or a semitransparent plate, which is formed by bonding a protective transparent plate on the upper surface of an original plate hologram, and a photosensitive material film for replication via an optical contact liquid. The duplicated part that is made by sticking the plates together,
In a method of producing a hologram by closely contacting a protective transparent plate and a photosensitive material film for replication through an optical contact liquid so that they are in contact with each other, and irradiating coherent light to replicate the original hologram to the photosensitive material film for replication , At least the surface of the protective transparent plate that contacts the duplication photosensitive material film, or the surface of the duplication photosensitive material film that contacts the protective transparent plate is engraved with a fine groove, and foreign matter mixed during hologram duplication is buried in the groove. , Reduce the dent defects due to foreign matter, and also
This is a method characterized in that bubbles mixed or generated during hologram duplication are removed along the groove to prevent defects caused by bubbles.

In this case, fine grooves are formed also on the surface of the transparent plate or the semitransparent plate of the duplication portion which is in contact with the photosensitive material film for replication, or on the surface of the photosensitive material film for replication which is in contact with the transparent plate or semitransparent plate. The groove is filled with foreign matter that is mixed in when the duplicated part is configured to reduce dent-like defects due to the foreign substance, and bubbles that are mixed in or generated when the duplicated part is configured are removed along the groove. , Defects due to bubbles can be prevented.

[0008]

[0009]

The hologram production apparatus of the present invention is
Film supplying means for supplying a photosensitive material film for duplication, a hologram original plate supported by a support, and a contact liquid supplying means for dropping or applying an adhesive liquid on the photosensitive material film for duplication, and the supplied adhesion. On the transparent plate or the semitransparent plate, a roller for smoothing the liquid, a pressing means for pressing the transparent plate or the semitransparent plate having a surface in which fine grooves are engraved on the photosensitive material film for replication through the contact liquid. And a drying means for drying the exposed photosensitive material film for replication.

[0011]

In the present invention, when fine bubbles are formed in the surface of the transparent plate or the semitransparent plate which is in contact with the photosensitive material film or the surface of the photosensitive material film which is in contact with the transparent plate or the semitransparent plate, air bubbles are present. , Removed along the groove, even if there is a foreign substance on any surface, it is embedded in the groove or is flushed from the groove with an optical contact liquid,
Since the duplicated film is not pressed, it is possible to prevent the occurrence of dented defects and the like. Further, since the optical contact liquid rapidly flows along the minute grooves engraved, the optical contact liquid can be made uniform and thin. It should be noted that although a microscopic trace of a foreign substance as observed by an optical microscope is recorded, a hologram having no defect in a reproduced image can be produced visually.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The principle and embodiments of the hologram manufacturing method, the manufactured hologram and the hologram manufacturing apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining a hologram duplication method in the case of using a flexible ND (neutral density) glass with an antireflection (AR) coat, and an ND glass with an AR coat 1
The original plate supporting glass 3 is brought into close contact with the above through the optical contact liquid 2, the original plate film 4 is supported by the supporting glass 3, and the original plate protective glass 6 is further adhered by the optical adhesive 5 to form the original plate portion. An optical contact liquid 7 is interposed in the original plate portion to form a duplication photosensitive material film 8, an optical contact liquid 9, and an AR-coated N
The D glass 13 is overlapped to form a duplicated portion.

In this case, the surfaces 15 and 16 of the original protective glass 6 and the AR-coated ND glass 13 which come into contact with the duplicating photosensitive material film 8 via the optical contact liquids 7 and 9 are brought into contact with the film 8 according to the present invention. The fine groove 17 is provided on one surface. The groove 17 may be a straight groove as shown in the plan view of FIG. 2 or a curved groove. Further, the cross-sectional shape of the groove 17 may be a rectangular groove as shown in FIG. 3 (a), but a V-shaped groove as shown in FIG. 3 (b) is preferable. The pitch of the grooves 17 is 50 μm to 20 μm.
The range of 0 μm is desirable, and the depth is 50
The range of μm to 200 μm is desirable.

As described above, in the present invention, the fine groove 1 is formed on one surface of the surface 15 of the original protective glass 6 on the optical contact liquid 7 side.
7 and the same fine groove 17 is provided on one surface 16 of the AR coated ND glass 13 on the optical contact liquid 9 side.
If such a groove 17 is not provided on the surface contacting with
As shown in (b), when the photosensitive material film 8 is brought into close contact with the optical contact liquids 7 and 9 interposed therebetween, if a minute foreign matter 18 exists between them, the photosensitive material film 8 is centered around the foreign matter 18. Is generated, and a portion in which a hologram cannot be recorded is generated, or unevenness is generated in the photosensitive material film 8 due to the foreign matter 18, so that a reproduced image of the duplicated hologram has a dent having a diameter of several hundred μm to several mm. A visible dented defect occurs. On the other hand, when the groove 17 is provided on the surface of the glass 6 or 13 in contact with the photosensitive material film 8, as shown in FIG. 4A, the minute foreign matter 18 is embedded in the groove 17 or an extra optical element 18 is formed. When the contact liquids 7 and 9 flow along the groove 17, they flow out together, the unevenness does not occur on the photosensitive material film 8, and the reproduced image of the reproduced hologram does not have a dent defect. Also,
If such grooves 17 are provided on the surfaces of the glasses 6 and 13 in contact with the photosensitive material film 8, the optical contact liquids 7 and 9 interposed between the glass and the photosensitive material film can easily flow, and even if bubbles are present, they can be combined. In addition, the flow of the optical contact liquids 7 and 9 is suppressed and stabilized in a short time after application, and the thickness can be made uniform and thin.

The fine grooves 17 may be provided on the surface of the glass 6 or 13 which contacts the glass 6 or 13 instead of on the surface of the glass 6 or 13 which contacts the glass 6 or 13. The effect is obtained.

Now, referring to FIG. 5, an original plate 26 and an ND using the original plate protective glass provided with the fine grooves as described above.
A duplication device for duplicating a hologram on the photosensitive material film 21 using the glass 29 will be described.

As shown in FIG. 5, the duplication photosensitive material film 21 is sent out from the supply roller 22 and wound by the winding roller 23. An original plate 26 having fine grooves on its upper surface is placed on a vertically movable support table 24, and a close contact liquid dropping device 25 drops a close contact liquid, and the support stand 24 is raised to raise the duplicate photosensitive material film. Make a close contact with 21. Excess liquid is squeezed by the roller 27 to be removed. Next, a contact liquid is dropped onto the recording film 21 by the contact liquid drop device 28 to bring it into close contact with the AR-coated ND glass 29. Also at this time, the excess liquid is squeezed out by a roller or the like, and the pressing device 32 presses the liquid to bring it into close contact. At this time, when the ND glass 29 is thick and cannot be squeezed by the rollers, the thickness is set to 0.1 to 1.5 mm, and the material is made to have no optical birefringence and have the same refractive index. By using a high polymer material, flexibility is provided and excess liquid can be squeezed out.

A laser beam 30 which is conjugated with the original plate 26 is made incident on the duplication system thus formed to perform exposure duplication. After duplication, AR coated ND glass 29
The recording film 21 is separated from the replication system by lowering the original plate 26. The separated recording film 12 enters the drying chamber 31 and is dried in order to remove the adhered adhesion liquid. The dried film is collected by the take-up roller 23. These move as a series of operations and are continuously copied. It is also possible to improve productivity by attaching a plurality of these exposure units and drying units.

Next, using a device as shown in FIG.
A V-shaped groove having a pitch of 100 μm and a depth of 100 μm is provided on the upper surface of the original plate 26 in contact with the photosensitive material film 21.
A similar groove is provided on the lower surface of the D glass 29 which is in contact with the photosensitive material film 21 to reproduce the hologram and to compare it with the original plate 26 in which such a groove is not engraved.
And ND glass 29 were used to reproduce the hologram.

When no groove is formed on the glass surface in contact with the light-sensitive material film 21, the central portion of the hollowed-out defect of the reproduced hologram is taken by an optical microscope (MH manufactured by OLYMPUS).
When observed with epi-illumination and dark-field observation at a magnification of 50 to 200 times using the L100 type, the foreign matter itself (<about 10 μm
m) and the strain in the vicinity of the foreign matter of the replicated film that is locally pressed by such foreign matter (several 10 μm)
It can be seen that a crater-like dark portion having a diameter of about 200 μm) is holographically recorded.

On the other hand, the original plate 26 is provided with the grooves as described above.
In the case of a hologram reproduced by providing a surface of the ND glass 29 that contacts the photosensitive material film 21, the foreign matter itself is also holographically recorded, but no dent defect is recognized in the vicinity thereof. Even if all the foreign matters flow out from the groove by the optical contact liquid, no dent-like defect is observed.

Thus, when the duplication is performed without using the glass or the photosensitive material film in which the groove is engraved, such foreign matter presses the film to be duplicated, and the reproduced image is several hundred μm to
Dimple-shaped defects with a diameter of several mm occur, but if a glass or photosensitive material film with grooves is used, even if foreign matter is present, it will be embedded in the groove,
Alternatively, the optical contact liquid is made to flow from the groove and does not press the film to be duplicated, and it is possible to prevent the occurrence of the dent defect. In a hologram reproduced by using a glass or a photosensitive material film engraved in the groove, when a foreign substance is embedded in the groove, even a portion where no dent-like defect is generated is observed by an optical microscope as shown in FIG. Visually, a trace of the foreign matter is recorded.

Although the hologram production method, the produced hologram and the hologram production apparatus of the present invention have been mainly described above for the case of duplication, the present invention is not limited to duplication, and the object light and the reference light are used as a photosensitive material. It can also be applied to the case where the hologram interference image is recorded by being simultaneously incident on the film.

[0024]

As is apparent from the above description, according to the hologram production method, the produced hologram and the hologram production apparatus of the present invention, the surface of the transparent plate or the semitransparent plate which is in contact with the photosensitive material film, or Since fine grooves are engraved on the surface of the photosensitive material film in contact with the transparent plate or the semi-transparent plate, if air bubbles are present, they are removed along the grooves, and even if foreign matter is present on any surface, it is Either embedded in the groove or flushed from the groove with an optical contact liquid,
Since the duplicated film is not pressed, it is possible to prevent the occurrence of dented defects and the like. Further, since the optical contact liquid rapidly flows along the minute grooves engraved, the optical contact liquid can be made uniform and thin. It should be noted that although a microscopic trace of a foreign substance as observed by an optical microscope is recorded, a hologram having no defect in a reproduced image can be produced visually.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a hologram duplication method according to the present invention.

FIG. 2 is a plan view showing an example of the form of a groove.

FIG. 3 is a diagram showing a cross-sectional shape of a groove.

FIG. 4 is a diagram showing a difference between a case where a groove is provided and a case where no groove is provided.

FIG. 5 is a diagram showing a schematic configuration of a hologram duplication device according to the present invention.

[Explanation of symbols]

1 ... AR coated ND glass 2 ... Optical contact liquid 3 ... Original plate supporting glass 4 ... Original plate film 5 ... Optical adhesive 6 ... Original plate protective glass 7 ... Optical contact liquid 8 ... Duplicate photosensitive material film 9 ... Optical contact liquid 13 ... AR-coated ND glass 15 ... Surface of the original protective glass in contact with the duplication photosensitive material film 16 ... AR-coated ND glass surface of the duplication photosensitive material film 17 ... Fine grooves 18 ... Foreign material 21 ... Duplication photosensitive material film 22 ... Supply roller 23 ... Take-up roller 24 ... Support 25 ... Adhesive droplet lowering device 26 ... Original plate 27 ... Roller 28 ... Adhesive droplet lowering device 29 ... ND glass 30 ... Laser light 31 ... Drying chamber 32 ... Pressing device

Claims (4)

(57) [Claims] 1. A method for producing a hologram by irradiating a recording portion formed by adhering a photosensitive material film to a transparent plate or a semitransparent plate through an optical contact liquid, by irradiating coherent light split into two light beams, The surface of the plate or semi-transparent plate that contacts the photosensitive material film, or the surface of the photosensitive material film that contacts the transparent plate or the semi-transparent plate, is engraved with a fine groove, and foreign matter mixed during hologram production is buried in the groove to make it a foreign material. A method for producing a hologram, which is characterized by reducing pit-shaped defects due to bubbles and removing bubbles mixed or generated during hologram production along the grooves to prevent defects due to bubbles. 2. An original portion formed by adhering a protective transparent plate on the upper surface of the original hologram, and a duplicated portion formed by adhering a transparent plate or a semitransparent plate to a photosensitive material film for duplication via an optical contact liquid. Are closely contacted with each other so that the protective transparent plate and the photosensitive material film for replication are in contact with each other through an optical contact liquid, and coherent light is irradiated to reproduce the original hologram on the photosensitive material film for replication to produce a hologram. In the method, at least the surface of the protective transparent plate that contacts the photosensitive film for replication,
Or, by engraving a minute groove on the surface of the photosensitive material film for duplication that contacts the protective transparent plate, the foreign matter mixed in during hologram duplication is buried in the groove to reduce the dent-like defects due to the foreign matter, and also hologram duplication A method for producing a hologram, characterized in that bubbles that are sometimes mixed or generated are removed along the groove to prevent defects due to the bubbles. 3. A fine groove on a surface of the transparent plate or the semitransparent plate of the duplication portion which is in contact with the photosensitive material film for replication, or on a surface of the photosensitive material film for replication which is in contact with the transparent plate or the semitransparent plate. The groove is filled with foreign matter that is mixed in when the duplicated part is configured to reduce dent-like defects due to the foreign substance, and bubbles that are mixed in or generated when the duplicated part is configured are removed along the groove. The method for producing a hologram according to claim 2, wherein defects caused by bubbles are prevented. 4. A film supplying means for supplying a photosensitive material film for duplication, and a contact liquid supplying means for dropping or applying an adhesive liquid on the hologram original plate supported by a support and on the photosensitive material film for replication. A roller for smoothing the supplied contact liquid, a pressing means for pressing a transparent plate or a semitransparent plate having a surface in which fine grooves are engraved in the photosensitive material film for replication via the contact liquid, a transparent plate or An apparatus for producing a hologram, comprising a laser light source for irradiating a laser beam from above a semitransparent plate, and a drying means for drying the exposed photosensitive material film for replication.