JP2870845B2 - Hologram manufacturing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing a hologram.

[Prior Art] Conventionally, as shown in FIG. 11, a hologram is prepared by arranging a photosensitive material 2 containing a hygroscopic binder on a hologram substrate 1 and further sealing it with a cover glass 3 via an adhesive 4. The reliability is ensured by providing moisture resistance and heat resistance. That is, in order to store the hologram for a long period of time, the hologram is sealed with a cover glass 3 that does not allow moisture to pass therethrough and an adhesive 4 that is transparent to the moisture and is close to the refractive index of the photosensitive material 2 and the cover glass 3. At this time, if the photosensitive material 2 is applied to the entire surface of the hologram substrate 1 and sealed when producing the hologram, the end face of the photosensitive material 2 is exposed and comes into contact with air, and as shown in FIG. 2 ends with a certain width (1 ~
10mm), which must be removed.

For this purpose, the photosensitive material 2 at the end of the hologram is scraped off, or when the photosensitive material 2 is applied, a tape is attached to the end so that the photosensitive material 2 cannot be applied to that portion.
Further, JP-A-59-201081 discloses a method of removing unnecessary portions of the photosensitive material 2 using a chemical treating agent.

[Problems to be Solved by the Invention] However, for those who are likely to scrape the photosensitive material 2, the work is very troublesome, and when the photosensitive material 2 is scraped, the photosensitive material 2 may be scratched or cut with a blade. The surface becomes dirty. In the method of applying the photosensitive material 2 by applying a tape, the work is troublesome, and the thickness of the photosensitive material 2 near the tape increases, so that when the tape is peeled, the photosensitive material 2 is peeled off and the end face of the photosensitive material 2 comes off. Becomes dirty. Further, JP-A-59-20
The method disclosed in Japanese Patent No. 1081 has a problem that the number of steps using chemicals increases and the cost increases.

An object of the present invention is to provide a method of manufacturing a hologram that can easily manufacture a beautiful hologram having no photosensitive material around a substrate.

Means for Solving the Problems According to the present invention, there is provided a step of arranging a water-repellent material serving as a mask around a substrate, and a method comprising: using the water-repellent material as a mask on the substrate and including a hygroscopic binder. A method for producing a hologram, comprising: applying a material, exposing the photosensitive material, and sealing the photosensitive material with a sealing material.

[Operation] After the water-repellent material is arranged around the substrate, a photosensitive material is applied using the water-repellent material as a mask. At this time, the photosensitive material is repelled by the water-repellent material, and a portion without the photosensitive material is formed.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 4 shows a hologram manufacturing process. First, the first
The rectangular hologram substrate 11 shown in FIGS. 2 and 3 is cleaned (first step). As the hologram substrate 11, a material such as glass or a transparent resin (for example, polycarbonate or acrylic) is used.

Next, the repellent material 12 is thinly applied to the peripheral portion of the hologram substrate 11 by spraying or the like (second step). Here, as the repellent material 12, a fluororesin-based water repellent, ethylene tetrafluoride, ethylene trifluoride, or the like is used. The repellent material 12 repels the photosensitive material 13, which will be described later, and is not removed by a processing agent in a later step. That is, ethanol and hardening treatment (eighth step) in removing the sealing material (seventh step)
Insoluble or difficult in hardening solution (acid hardening fixer), water in washing (9th step), hot water in hot water bath (10th step), isopropyl alcohol in dehydration treatment (11th step) It is soluble.

Then, a photosensitive material 13 containing a hygroscopic binder (gelatin) and ammonium bichromate is applied onto the hologram substrate 11 (third step). The photosensitive material 13 contains an aqueous gelatin solution in which 1 to 20% by weight of gelatin is dissolved in hot water at 30 ° C. to 50 ° C.

Next, the hologram substrate 11 is dried in order to reduce the water content of the aqueous gelatin solution of the photosensitive material 13 (fourth step).
Further, the photosensitive material 13 is sealed with a cover glass in order to keep the amount of water in the aqueous gelatin solution constant (fifth step). At this time, silicon oil is interposed between the cover glass and the photosensitive material 13 as a refractive index adjusting liquid (index matching liquid) to eliminate a change in the refractive index at the boundary surface between the cover glass and the photosensitive material 13. Note that the refractive index adjusting liquid may be xylene, benzene, or the like in addition to silicon oil.

Exposure is performed to record interference fringes (6th.
Process). Further, after removing the cover glass provided in the fifth step, the refractive index adjusting liquid is removed with ethanol (seventh step). When a volatile refractive index adjusting liquid such as xylene or benzene is used, it evaporates at room temperature, so that the seventh step is omitted.

Thereafter, a hardening treatment with an acidic hardening fixer (8th step), a water washing treatment (9th step), a hot water bath at 20 to 40 ° C. (10th step)
Process), dehydration treatment with isopropyl alcohol (11th
Step) and high-temperature drying at 100 to 130 ° C. (twelfth step).
Even if these processes are performed, the water-repellent material 12 applied around the hologram substrate 11 is not removed.

Then, as shown in FIG. 3, sealing with the cover glass 14 via the adhesive 15 is performed (13th step). As a result, a hologram having high reliability (moisture resistance, heat resistance) is completed.

As described above, according to the present embodiment, after arranging the water repellent material 12 around the hologram substrate 11, the photosensitive material 13 (an aqueous solution containing gelatin and ammonium bichromate) is applied using the water repellent material 12 as a mask. Further, the photosensitive material 13 was sealed with a sealing material (cover glass 14, adhesive 15). When the photosensitive material 13 is applied, the photosensitive material 13 is repelled by the water-repellent material 12, so that a portion without the photosensitive material 13 is formed around the hologram substrate 11. As a result, it is possible to manufacture a hologram having no photosensitive material around the hologram substrate without removing the photosensitive material 2 or attaching a tape in the conventional method.
Therefore, in the method of scraping off the photosensitive material, the photosensitive material is scratched or the shaved surface becomes dirty, and in the method of applying the photosensitive material by applying tape, the end surface of the photosensitive material becomes dirty, but in this embodiment, Such a thing is avoided. Further, there is no need to use a chemical agent for removing unnecessary portions of the photosensitive material as disclosed in JP-A-59-201081, so that no cost increase is caused.

Thus, a beautiful hologram having no photosensitive material 13 around the hologram substrate 11 can be easily manufactured.

Note that the present invention is not limited to the above embodiment. For example, a material that is removed after the photosensitive material 13 is applied after the application of the water-repellent material may be used as the water-repellent material. That is, a material that is soluble in ethanol for removing the sealing material (the seventh step) or isopropyl alcohol for the dehydration treatment (the eleventh step), for example, silicon oil, may be used.

As shown in FIG. 5, a fluorine-based or silicon-based O-ring 16 may be used as the water-repellent material. That is, the O-ring 16 is pressed against the hologram substrate 11 by the stopper 17, so that no gap is formed between the O-ring 16 and the hologram substrate 11. Then, in this state, the photosensitive material 13 is applied. Thereafter, after the photosensitive material 13 is gelled or dried, O
The ring 16 and the stopper 17 may be removed. In this case, silicon rubber may be used instead of the O-ring 16.

Further, as another example using silicon rubber as the water repellent material, the present invention may be implemented as shown in FIG.
That is, the silicon rubber 18 is placed on the hologram substrate 11. At this time, the same silicone oil 19 as that used as a sealing material in the cover glass sealing step (fifth step) in FIG. 4 is used to prevent the photosensitive material 13 from entering the gap between the hologram substrate 11 and the silicon rubber 18. Fill.
At this time, if the silicon rubber 18 is immersed in silicon oil and then placed on the hologram substrate 11, the work of filling the gap is easy. After that, the photosensitive material 13 is applied.

In the case of this embodiment, as shown in FIG. 7, when the total thickness of the silicone rubber 18 and the silicone oil 19 is smaller than the thickness of the photosensitive material 13 (thickness before drying), the silicone rubber 18 after gelation is formed. Is removed and dried. However, when the total thickness of the silicone rubber 18 and the silicone oil 19 is larger than the thickness of the photosensitive material 13 as shown in FIG. 8, the edge of the photosensitive material 13 becomes sharp as shown in FIG. Therefore, as shown in Fig. 10, after gelling once, warm it to the melting point of gelatin or higher (to the temperature that changes from gel to sol) to gelatinize and round the tip, then gel again and dry. What should I do?

[Effects of the Invention] As described above in detail, according to the present invention, an excellent effect of easily producing a beautiful hologram having no photosensitive material around the substrate is exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view for explaining a hologram manufacturing process of the embodiment, FIG. 2 is a cross-sectional view for explaining a hologram manufacturing process, FIG. 3 is a cross-sectional view of a completed hologram, and FIG. FIG. 5 is a cross-sectional view for explaining a manufacturing process of a hologram of another example, FIG. 6 is a cross-sectional view for explaining a manufacturing process of a hologram of another example,
FIG. 7 is a cross-sectional view for explaining a manufacturing process of another alternative hologram, FIG. 8 is a cross-sectional view for explaining a manufacturing process of another alternative hologram, and FIG. 9 is another alternative example. FIG. 10 is a cross-sectional view for explaining a manufacturing process of the hologram of FIG. 10;
FIG. 11 is a cross-sectional view for explaining the prior art, and FIG. 12 is a cross-sectional view for explaining the prior art. 11 is a hologram substrate, 12 is a water-repellent material, 13 is a photosensitive material, 14
Is a cover glass as a sealing material, and 15 is an adhesive as a sealing material.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-59-201081 (JP, A) JP-A-57-146283 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G03H 1/02 G03H 1/18 G03F 7/16

Claims (1)

(57) [Claims] A step of disposing a water-repellent material serving as a mask around the substrate; a step of applying a photosensitive material containing a hygroscopic binder on the substrate using the water-repellent material as a mask; A method for manufacturing a hologram, comprising: exposing a photosensitive material; and sealing the photosensitive material with a sealing material.