JPH06148897A - Production of screen printing plate - Google Patents

Abstract

PURPOSE:To make possible the formation of fine patterns having sharp aperture shapes even if the thickness of a shielding film is increased in such a manner that a desired pattern thickness is obtd. and to make possible the rapid production of the screen printing plate with the relatively easy control of the thickness of the shielding film and without using an exposure mask. CONSTITUTION:A base 2 is immersed into a UV curing resin 10. The prescribed patterns by UV rays are drawn by a laser beam 13, etc., on the UV curing resin 10 existing above this base 2 and the UV curing resin 10 curing at this time is laminated on the base 2, by which the shielding film 3 having prescribed apertures 4 is formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a screen printing plate which is optimal for printing fine pitch patterns on electronic parts.

[0002]

2. Description of the Related Art A screen printing plate used for pattern printing of electronic parts, for example, has openings of a predetermined pattern on the upper surface of a support body such as a mesh 2 whose peripheral portion is supported by a support frame 1 as shown in FIG. Although it is constructed by providing the shielding film 3 having the portion 4, the screen printing plate of this type has been conventionally produced by the method shown in FIG.

That is, first, a mesh (support) 2 made of stainless steel or polyester is attached to a support frame 1 made of metal, wood or the like (FIG. 1A), and a shielding film 3 is formed on the upper surface of the mesh 2. Then, the photosensitive resin film 5 is laminated ((b) in the figure). The lamination of the photosensitive resin film 5 is performed, for example, by using a photosensitive resin film and adhering it to the upper surface of the mesh 2 or applying a photosensitive resin such as emulsion to the upper surface of the mesh 2.

In this state, an exposure mask 6 formed by, for example, photoengraving is placed on the upper surface of the photosensitive resin film 5, and the photosensitive resin film 5 is exposed to ultraviolet rays 7 through the exposure mask 6 to perform exposure. A latent image by a photochemical reaction corresponding to the pattern drawn on the mask 6 is formed on the photosensitive resin film 5 ((c) in the figure).

Thereafter, development was carried out to form a polymer image, and thereby a screen printing plate provided with a shielding film 3 having openings 4 of a predetermined pattern was obtained ((d) in the same figure).

Here, with the recent trend toward lighter, thinner, shorter, and smaller electronic devices, the pitch of terminals of electronic parts has been narrowed at an accelerating pace, and narrow-pitch pattern printing can be performed even for screen printing technology with high productivity. Is desired.

In order to meet this demand, in addition to the ink, the screen printing machine and the printing conditions, it is important to deal with the screen printing plate. That is, in the screen printing plate, the wire diameter of the mesh, the mesh opening (gap between adjacent lines), the tensile strength of the mesh, the film thickness of the shielding film, the shape of the opening provided in the shielding film, etc. It will be an important factor.

Therefore, it has been usual to cope with the fine patterning with a narrow pitch by reducing the film thickness of the shielding film.

[0009]

However, in the above-mentioned conventional example, when the film thickness of the shielding film is made thin to cope with the fine patterning, the ink supply amount at the time of printing becomes small, which is required. However, there is a problem that the pattern thickness is not obtained.

On the other hand, if the film thickness of the shielding film is increased so that the required pattern thickness can be obtained, not only is it difficult to form a fine pattern, but also the residual photosensitive resin that remains on the mesh and cannot be cut off. Due to the formation of a film, the shape of the opening of the shielding film lacks sharpness, the pattern shape becomes unstable, and the variation in the ink supply amount also increases.

In view of the above, the present invention makes it possible to increase the thickness of the shielding film so as to obtain the required pattern thickness.
A screen printing plate capable of forming a fine pattern having a sharp opening shape, relatively easy control of the film thickness of the shielding film, and capable of being produced in a short time without using an exposure mask. The purpose is to provide.

[0012]

In order to achieve the above object, a method for producing a screen printing plate according to the present invention is such that a support is dipped in an ultraviolet curable resin and the ultraviolet curable resin located above the support is immersed in the ultraviolet curable resin. Drawing is performed with ultraviolet rays, and an ultraviolet curable resin that cures at this time is laminated on a support to form a shielding film.

[0013]

According to the present invention having the above-described structure, the ultraviolet curable resin located above the support is subjected to drawing with ultraviolet light to cure only the surface exposed to the ultraviolet light, and the surface not exposed to the ultraviolet light is cured. The shielding film can be grown to a desired thickness by forming the shielding film as the opening on the support and by repeating the drawing of the same pattern with ultraviolet rays while lowering the support.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIG. In this embodiment, the screen printing plate shown in FIG. 2, that is, the screen printing plate in which a shielding film 3 having openings 4 of a predetermined pattern is provided on the upper surface of a mesh (support) 2 whose peripheral portion is supported by a supporting frame 1 is used. It shows an example of manufacturing.

First, an elevator mechanism (not shown) is arranged beside the tank 11 filled with the ultraviolet curable resin 10, and the arm 12 vertically moved by this elevator mechanism reaches the inside of the tank 11. Leave.

Here, the UV curable resin 10 is a resin having a characteristic that a liquid undergoes a polymerization reaction by the light energy of ultraviolet rays to change into a solid, which is a photopolymerizable polymer, a photoinitiator, and a characteristic improving agent. It contains additives for Further, by using a stepping motor as a drive source for the vertical movement of the elevator mechanism, it is possible to easily control the position of the stage 12 in the height direction.

Then, a mesh (support) made of stainless steel or polyester is attached to the support frame 1 made of metal or wood.
2 is placed on the stage 12, and the depth Δh of the ultraviolet curable resin 10 located on the mesh 2 is set to a predetermined depth by the elevator mechanism and the squeegee (the same figure). (A)).

In this state, the laser light source and the laser beam 1
Through a drawing device (not shown) having a mechanism capable of performing line scanning or surface scanning of 3, ultraviolet drawing (exposure) is performed from above the tank 11 toward the ultraviolet curable resin 10.
The ultraviolet curable resin 10 that cures at this time is laminated on the mesh 2 to form the first-layer shielding film 3a having the openings 4 (FIG. 7B).

That is, for example, a He--Cd beam or an Ar beam is used as the laser beam 13, and the laser beam 13 is surface-scanned according to a pattern formed by CAD, for example. Then, the ultraviolet curable resin 10 located on the surface hit by the laser beam 13 is cured to become the first-layer shielding film 3a, and the ultraviolet curable resin 10 located on the surface not hit by the laser beam 13 is opened as a liquid. Part 4
Becomes

As a result, a fine pattern having a laser beam diameter level of, for example, about 10 μm can be formed. Next, the elevator mechanism and squeegee are used to set the depth of the ultraviolet curable resin 10 located above the first-layer shielding film 3a to a predetermined depth Δh, and then the same pattern as above is used. Then, drawing is performed with ultraviolet rays from above the tank 11 toward the ultraviolet curable resin 10, and the ultraviolet curable resin 10 that cures at this time is applied to the second layer of the shielding film 3.
As b, it is laminated on the first layer of the shielding film 3a to grow the shielding film 3 having the opening 4 (FIG. 7C).

By repeating such a process, the shielding film of the third layer is sequentially laminated on the shielding film 3b of the second layer, and the shielding film of the fourth layer is sequentially laminated on the shielding film 3b. This is grown until the thickness is the desired thickness.

Then, when the shielding film 3 reaches a predetermined thickness t, it is taken out from the tank 11 and washed, and then the uncured ultraviolet curable resin 10 is removed, and after that, post-baking is performed to perform screen printing. Complete the plate (Fig. (D)).

In this way, a high aspect pattern can be obtained by the thickness of one step and the number of repetitions, the end face of the opening 4 is sharp, and the residual resin film may adhere to the mesh 2. No screen printing plate can be produced.

Moreover, since the exposure mask is not required, not only the screen printing plate can be manufactured in a short time, but also the pattern is changed because of the method of scanning the laser beam according to the pattern formed by CAD, for example. C
It can be easily done on AD.

Since the formation thickness of one step is determined by the structure of the ultraviolet curable resin and the light intensity of ultraviolet rays, a fine, high aspect pattern can be obtained even by one step depending on the setting of conditions.

[0026]

Since the present invention has the above-mentioned structure,
By forming a shielding film on the support by drawing with ultraviolet rays on the ultraviolet curable resin located above the support,
Even if the film thickness of the shielding film is increased to obtain the required pattern thickness, it is possible to form a fine pattern having a sharp opening shape, and it is relatively easy to control the film thickness of the shielding film. Moreover, there is an effect that it can be manufactured in a short time without using an exposure mask.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention in the order of steps.

FIG. 2 is a plan view of a screen printing plate.

FIG. 3 is a cross-sectional view showing a conventional example in the order of steps.

[Explanation of symbols]

 1 Support Frame 2 Mesh (Support) 3, 3a, 3b Shielding Film 4 Opening 10 Ultraviolet Curing Resin 11 Tank 13 Laser Beam

Claims (1)

[Claims] 1. A shield film is obtained by immersing a support in an ultraviolet curable resin, drawing an ultraviolet ray on the ultraviolet curable resin located above the support, and laminating the ultraviolet curable resin which is cured at this time on the support. A method for producing a screen printing plate, which comprises: