KR100545668B1 - Method of Making a Photomask for Embossed Hologram - Google Patents

Abstract

The present invention relates to a method that can more easily produce a photomask required for the step before producing a glass master in the embossed hologram manufacturing process.

To this end, the present invention, the step of designing the source image of the hologram to be represented by computer graphics work, the step of cleaning the transparent plate to remove the foreign matter adhering to the surface and drying it, the cleaned and dried on the transparent plate Applying a pretreatment liquid mixed with an epoxy resin, a curing agent and a diluent thereof, directly outputting the source image onto the transparent plate to which the pretreatment liquid is applied using a flatbed inkjet printer, and printing the source image It provides a photomask manufacturing method for the embossed hologram comprising the step of drying the transparent plate.

Embossed Hologram, Photo Mask, Glass Master, Silver Dye Film

Description

Method of Making a Photomask for Embossed Hologram}

1 is a block diagram briefly illustrating a conventional photomask fabrication process.

2 is a view briefly illustrating a manufacturing process from A to C of FIG.

3 is a block diagram briefly illustrating a photomask manufacturing process according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: Transparent film for engraving 2: Glass plate

3: silver dye

The present invention relates to a method of manufacturing a photomask for embossed holograms, and more particularly, to easily produce a photomask required for a step before manufacturing a glass master in an embossed hologram manufacturing process. It is about a method.

In general, the embossed hologram film is a graphic process for producing a photomask using an image designed by computer graphics work, by photographing an image on the photomask on a glass plate coated with photoresist using a laser beam Mastering process to make glass master, plating process to make nickel mold by plating the surface of glass master, and embossing process to print film by applying heat and pressure to film using shim made through plating process as hologram disc It is manufactured through. In addition, the hologram film produced through such a process is again commercialized into various forms such as a sticker or a stamping foil through a post-treatment process.

Referring to Figures 1 and 2 looks at the photomask manufacturing process of the graphic process related to the present invention.

First, an image to be expressed is designed by a computer graphic operation (A), and the image is output (B) on the plate making transparent film 1 using the plate making output machine, and then again printed on the transparent film. The image is exposed (C) on a glass plate (Silver Halide Photo Plate, such as Kodak HRP, Agfa HDP, etc.) 2 coated with a silver salt sensitizer 3. At this time, the hologram represented on the finished product is separately produced by each image ('ga' and 'b' in Fig. 2) according to the difference in the background, color, and depth, in order to produce such a photomask Properly match the focusing of the transparent film (1) and the glass plate (2) for commercial use so that the relative position of each image does not change.

Next, the glass plate 2 on which the image is taken is sequentially dipped in a developing solution, a fixing solution, and a fixing solution in a dark room as a negative film is developed, and dried again to produce a photomask. In the photomask produced through this process, the image designed by the graphic work is developed in the shade inverted like the negative film of the photo (see B and C of FIG. 2), and the photomask is a glass master in the mastering process. It is used as a mask for taking an image on the image.

However, such a conventional photomask manufacturing method consists of a two-step process of outputting an image designed by computer graphics work on a transparent film, and then using the film to produce a photomask, which requires accuracy. Due to the nature of the process, the production efficiency is lowered, causing the production cost to rise.

Specifically, in order to produce a plurality of photomasks according to a background or a front image in order to give a 2D or 3D depth to a hologram to be commercialized, the transparent film required in proportion to the amount of photomask to be produced and the corresponding The amount of glass plate is also increased. In order to make each photomask, the work required to accurately photograph the pins between the transparent film and the glass plate coated with the photosensitive agent is very difficult and cumbersome, which leads to a decrease in production efficiency. Moreover, Kodak's High Resolution Plate (HRP) films, which are mainly used as glass plates for making photomasks, are all imported and sold, resulting in an increase in the manufacturing cost of holograms.

In addition, in order to develop the photographed HRP film, a separate dark room should be prepared and solvents such as developer and stabilizer should be used. Therefore, in order to improve productivity and reduce manufacturing cost, the process of making the photomask is simplified in the embossed hologram manufacturing process. There is a great demand.

The present invention proposed to solve the problems as described above, it is an object of simplifying the photomask manufacturing process to reduce the manufacturing cost and increase the productivity of the embossed hologram.

In order to achieve the above object, a method for manufacturing an embossed hologram photomask according to the present invention comprises the steps of designing a source image of a hologram to be expressed by computer graphics work, and a transparent plate for removing foreign substances attached to the surface. Washing and drying the transparent plate; applying a pretreatment liquid mixed with an epoxy resin, a curing agent, and a diluent thereof to the cleaned and dried transparent plate; and using the flat plate transfer inkjet printer, applying the pretreatment liquid to the transparent plate. Directly outputting the source image, and drying the transparent plate on which the source image is printed.

The material of the photomask to be used, namely the transparent plate, mainly uses a flat transparent glass. The glass has a hardness of 5.5 to 6, so that scratches are not easily generated on the surface, and when the laser image of the photomask is imaged on the glass master, scratches on the surface of the photomask prevent blemishes on the glass master. can do.

In this description, a hologram or a hologram image refers to characters, symbols, and shapes expressed in various types of hologram products, and the source image is designed by a computer graphic work and recorded on a photomask, distinguished from the hologram implemented in the product. Refers to. In addition, the source image is not directly photographed on a glass plate coated with a silver dye-sensitizer after being first output to the transparent film, but is printed directly on the transparent glass plate using a flatbed transfer inkjet printer, so that the shadows in the photomask fabrication process are reduced. The problem of inversion does not occur.

Hereinafter, with reference to the accompanying drawings looks at the manufacturing method of the photomask for the embossed hologram according to an embodiment of the present invention.

As illustrated in FIG. 2, after designing a holographic image to be expressed through computer graphics, the image is directly output to the transparent glass plate through an inkjet printer. At this time, the printer to be used is configured to print the source image directly on the transparent glass plate while placing the transparent glass plate on a horizontally moving flat plate or transfer table, such as "Digital Printing Inkjet Printer" of Patent No. 0342445. Use a flatbed inkjet printer.

On the other hand, the ink used in the conventional inkjet printer is made by dissolving a dye in a solvent such as water, alcohol, acetone, ethylene, etc., in order to inkjet print the source image on the glass that does not absorb such ink, the ink is absorbed in advance on the transparent glass plate An ink absorbing layer that can be formed should be formed. The pretreatment liquid coating process for forming the ink receiving layer will be described.

First, a general transparent glass plate having a certain thickness is washed with distilled water to remove foreign substances adhering to the surface of the transparent glass plate, and placed vertically in a chamber for blocking airborne floats, followed by natural drying. Then, a pre-treatment liquid is applied to the dried transparent glass plate, and then naturally dried at room temperature for 2 to 3 minutes.

As a method for applying the pretreatment liquid, the spray is sprayed evenly on the transparent glass plate, or the spray spraying method, a spin that rotates the glass plate while dropping the pretreatment liquid thereon so that the pretreatment liquid can be evenly applied on the glass plate by centrifugal force. Coating methods, such as the use of a bar coater (Bar Coater) used to coat a paint or other coating to a certain thickness. At this time, it is preferable to install the transparent glass plate in the chamber and to apply the pretreatment liquid or to apply the pretreatment liquid in a room equipped with a suction facility so that foreign matter does not adhere to the surface of the transparent glass plate during the pretreatment liquid coating operation.

Meanwhile, the pretreatment liquid to be used may be a pretreatment liquid such as "Inkjet printing method for a non-invasive material and a pretreatment liquid composition for this" of Patent Application No. 0031017, more preferably epoxy resin and epoxy A mixed solvent in which a hardener for resin (Hardner) is mixed (usually mixed in a 1: 1 ratio) is used. A small amount of a diluent such as anone is added to the mixed solvent to facilitate mixing and dilute the solvent.

Next, the transparent glass plate coated with the pretreatment liquid is placed on the transfer table of the flatbed transfer inkjet printer, and the source image designed by the computer graphic work is printed on the transparent glass plate. In addition, the transparent plate on which the source image is printed is dried in a drying furnace at 60 to 300 ° C. (preferably 60 to 300 ° C.) for 5 to 60 minutes (preferably 5 to 10 minutes), or blocked in air. It is naturally dried in a chamber for 2 to 24 hours (preferably 2 to 3 hours).

The glass master is manufactured using the photomask fabricated as described above. In order to add a three-dimensional or depth to the hologram, a photomask is produced as necessary such as a background or a front image and a laser is applied to the glass master coated with photoresist. Shoot at different angles.

According to the manufacturing method of the embossed hologram photomask having the above-described configuration, the photomask can be manufactured by directly printing the image designed by graphic work on a normal transparent glass plate, thereby simplifying the photomask manufacturing process and increasing production efficiency. It can increase the production cost.

In particular, even in the case of manufacturing a plurality of photomasks, unlike the conventional case, the inconvenience and hassle of the manual work that has to work together to match the focus between each transparent film and the transparent glass plate is eliminated.

In addition, since the pretreatment liquid can be simply prepared using an epoxy resin, the manufacturing cost and work efficiency of the photomask are improved.

Claims (6)

In the photomask manufacturing method for embossed hologram, Designing a source image of the hologram to be expressed by the computer graphics work; Cleaning the transparent plate to remove foreign matters attached to the surface and drying the transparent plate; Applying a pretreatment liquid mixed with an epoxy resin and a curing agent and diluent thereof to the washed and dried transparent plate; Directly outputting the source image onto the transparent plate to which the pretreatment liquid is applied using a flatbed inkjet printer; And drying the transparent plate on which the source image has been printed. The method of claim 1, The pretreatment liquid is sprayed onto the transparent plate to apply a photomask manufacturing method. The method of claim 1, And the pretreatment liquid is spin-coated to the transparent plate and applied in a chamber for blocking airborne suspended matter. The method of claim 1, The pretreatment liquid is a photomask manufacturing method, characterized in that the coating on the transparent plate by a bar coater (Bar Coater). The method of claim 1, The transparent plate on which the source image is printed is dried in a drying furnace for 5 to 60 minutes at 60 ~ 300 ℃. The method of claim 1, The transparent plate on which the source image is printed is a photomask manufacturing method characterized in that the natural drying for 2 to 24 hours in a chamber for blocking the suspended matter in the air.

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