Screen plate making with alignment marks

Abstract

To provide screen plate making with alignment marks that can obtain clearer contrast even in screen plate making where clear contrast cannot be obtained due to the transmission of illumination light when recognizing alignment marks with a CCD camera.SOLUTION: A screen plate making with an alignment mark in which in an alignment mark obtained by forming an alignment mark opening using a photosensitive resin used in screen print making and filling the opening with resin by burying a resin in the opening, on the illumination light illumination side used when recognizing the alignment mark and on the other surface 8 which is not the one surface 7 on the alignment mark imaging side, a resin coating layer is formed with a resin so as to cover the resin-filled alignment marks and to cover a wider range than the size of the resin-filled alignment marks.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an alignment mark for screen printing. [Background technology]

[0002] For example, when printing a printed material such as ink or paste at a desired position on a printed material using screen printing, an alignment mark may be formed on the screen printing and the printed material to align the positions of the printed material and the screen printing. When forming an alignment mark on the screen printing, a photosensitive resin is usually applied to the screen mesh, and the alignment mark is formed at the same time as exposing and developing the printing pattern. The formed alignment mark is formed as an opening on the screen mesh, and in this state, the photosensitive resin around the alignment mark is colored to make the contrast of the alignment mark clear (for example, Patent Document 1), or the opening of the alignment mark is filled with a white resin to make the contrast of the alignment mark clear, enabling alignment with higher accuracy (for example, Patent Document 2). Note that in Patent Document 1, the alignment mark is left open, but in most cases, the opening of the alignment mark is blocked with resin as described in Patent Document 2 in order to prevent the printed material from being transferred to the printed material through the opening of the alignment mark during screen printing. A transparent resin is often used as the resin to seal the opening, but depending on the specifications of the imaging device, such as a CCD camera that recognizes the alignment mark, colored resin, black resin, white resin, etc. may be used to make the contrast between the photosensitive resin and the alignment mark clearer. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-218602 A (see claims, detailed description of the invention, and Figs. 1 to 7) [Patent Document 2] Japanese Patent No. 6382580 (see claims, detailed description of the invention, and figures 1 to 5) Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, as printing patterns become more fine, there is an increasing demand for improved alignment accuracy of screen printing to the printed material. In order to improve the alignment accuracy to the printed material, it is necessary to improve the recognition accuracy of the alignment mark, and to improve the recognition accuracy, it is essential to make the contrast between the alignment mark and the surrounding photosensitive resin clear. Usually, when capturing an image of an alignment mark with an imaging device such as a CCD camera, there are two types of illumination light irradiation methods: irradiating the screen printing from the imaging device side (one side) (hereinafter referred to as reflected light) and irradiating the screen printing from the side opposite to the imaging device side (the other side) (hereinafter referred to as transmitted light). If the resin that blocks the alignment mark is transparent, it is possible to recognize the alignment mark using transmitted light and reflected light, but if the opening of the alignment mark is blocked by a colored resin or a black or white resin, the alignment mark cannot be recognized by transmitted light, so the alignment mark is recognized using reflected light. As described above, when recognizing an alignment mark with higher accuracy using reflected light, it is necessary to make the contrast between the alignment mark and the photosensitive resin around the alignment mark clear. However, when forming an alignment mark of the conventional technology on a screen plate using a synthetic fiber screen mesh such as polyester or nylon and recognizing it with a CCD camera using reflected light, the position of the alignment mark may be difficult to recognize. This is thought to be because, when the screen plate is irradiated with reflected light, the photosensitive resin around the alignment mark and the synthetic fiber screen mesh transmit the reflected light, making it difficult to obtain sufficient contrast and making it difficult to recognize the position of the alignment mark. This phenomenon may occur not only in screen plate making using a synthetic fiber screen mesh, but also when a metal screen mesh such as stainless steel or tungsten is used, for example, when the thickness of the photosensitive resin is thin, or depending on the number of meshes, the size of the mesh openings (also called openings), or the wire diameter of the mesh. SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a screen printing plate having alignment marks formed thereon that enable clear contrast to be obtained when the alignment marks are recognized using reflected light. [Means for solving the problem]

[0005] The first invention of the present invention capable of achieving the above object is a screen printing plate having alignment marks as described in claim 1, which is as follows. an alignment mark is obtained by forming an opening for an alignment mark using a photosensitive resin used in screen printing and filling the opening with resin to close the opening, and a coating layer is formed of resin on one surface other than the surface which is the illumination light irradiation side and the alignment mark imaging side used when recognizing the alignment mark, so as to cover the resin-filled alignment mark and to cover an area wider than the size of the resin-filled alignment mark; In the screen printing having the alignment mark, the resin used to fill the opening for the alignment mark is a white-colored resin, and the resin used to form the coating layer is a black-colored resin. It is a composition 。

[0006] The present invention can achieve the above object. 2 The invention is 2The screen printing method has alignment marks as described in the above and is as follows: In the screen printing process, an alignment mark is obtained by forming an opening for an alignment mark using a photosensitive resin used in screen printing and filling the opening with resin to close the opening, and the screen printing process has a resin coating layer formed on one side other than the side that is the illumination light irradiation side and the alignment mark imaging side used when recognizing the alignment mark, so as to cover the resin-filled alignment mark and to cover an area larger than the size of the resin-filled alignment mark, The resin used to fill the alignment mark opening is a black-colored resin, and the resin used to form the coating layer is a white-colored resin.

[0007] The present invention can achieve the above object. 3 The invention is 3 The screen printing method has alignment marks as described in the above and is as follows: In the screen printing process, an alignment mark is obtained by forming an opening for an alignment mark using a photosensitive resin used in screen printing and filling the opening with resin to close the opening, and the screen printing process has a resin coating layer formed on one side other than the side that is the illumination light irradiation side and the alignment mark imaging side used when recognizing the alignment mark, so as to cover the resin-filled alignment mark and to cover an area larger than the size of the resin-filled alignment mark, The color of the resin used to fill the alignment mark opening and the color of the resin of the coating layer are formed in a color system that has a complementary relationship. Effect of the Invention

[0008] The screen printing plate having alignment marks according to the present invention has the configuration as described above, and therefore has the following advantages. (1) The alignment mark opening is formed using the photosensitive resin used in screen printing, the opening is filled with resin to block it, and a resin coating layer is formed from the other side to cover the resin portion that blocks the opening, so that it is possible to prevent the printed matter from leaking out of the alignment mark and being transferred to the printed matter during screen printing, and to prevent the resin filled in the alignment mark opening from being chipped. Also, since there is no need to color only the photosensitive resin, the workability is good. (2) By forming the resin coating layer on the other surface to have a size equal to or larger than the angle of view of the image capturing device, the alignment mark can be recognized more reliably. (3) By using a white-colored resin as the resin filling the opening for the alignment mark and using a black-colored resin as the coating layer formed to cover the resin blocking the opening from the other side and the photosensitive resin around it, the white-colored resin portion becomes the light portion and the black-colored resin portion of the coating layer formed on the other side suppresses the transmission of illumination light and becomes the dark portion, thereby obtaining an alignment mark with clearer contrast. (4) By using a black-colored resin as the resin filling the opening for the alignment mark and using a white-colored resin as the coating layer formed to cover the resin blocking the opening from the other side and the photosensitive resin around it, the black-colored resin portion becomes the dark area, and the white-colored resin portion of the coating layer formed on the other side suppresses the transmission of illumination light and becomes the bright area, thereby obtaining an alignment mark with clearer contrast. (5) By making the color of the resin that fills the opening for the alignment mark and the color of the resin of the coating layer that is formed to cover the resin that blocks the opening from the other side and the photosensitive resin around it complementary colors so that they stand out more easily, an alignment mark with clearer contrast can be obtained. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] This screen printing has an alignment mark obtained by forming an opening for an alignment mark using a photosensitive resin used in screen printing, and filling the opening with resin to block the opening, and forming a coating layer of resin on the other side of the screen other than the side that is the illumination light irradiated side and the alignment mark imaging side used when recognizing the alignment mark, so as to cover the resin-filled alignment mark and to cover an area larger than the size of the resin-filled alignment mark, and the resin used to fill the opening for the alignment mark is a white-colored resin, and the resin used to form the coating layer is a black-colored resin. [Brief description of the drawings]

[0010] [Figure 1] 1A and 1B are drawings for explaining an overall view of a screen plate making method having alignment marks according to the present invention, in which (a) is a schematic plan view and (b) is a schematic front view. [Diagram 2]This shows a first embodiment of screen making having an alignment mark of the present invention, in which the alignment mark is filled with white-colored resin and a black-colored coating layer is applied to the other side of the alignment mark other than the side irradiated with the illumination light and the side imaged by the CCD camera.(a) is a schematic cross-sectional view of the screen making showing the state before the openings are filled with resin, (b) is a schematic cross-sectional view of the screen making showing the state after the openings have been filled with resin using a squeegee or the like, (c) is a schematic cross-sectional view of the screen making in which a coating layer is formed via a masking film so as to cover an area larger than the size of the alignment mark filled with resin in the opening, and (d) is a schematic cross-sectional view of the screen making showing the state after the masking film of (c) has been removed. [Diagram 3] 1A is a schematic bottom view showing the state before resin is embedded in the opening, FIG. 1B is a schematic plan view, and FIG. 1C is a schematic cross-sectional view. [Figure 4] 1A is a schematic bottom view showing the state before resin is embedded in the opening, FIG. 1B is a schematic plan view, and FIG. 1C is a schematic cross-sectional view. [Diagram 5] In an alignment mark of the present invention, the opening is filled with a blackish resin, and a whiteish coating layer is applied to the other side other than the side irradiated with illumination light and the side imaged by the CCD camera. (a) is a schematic bottom view showing the state before the resin is filled into the opening, (b) is a schematic plan view, and (c) is a schematic cross-sectional view. [Figure 6] 10A is a schematic bottom view showing the state before resin is embedded in the opening, FIG. 10B is a schematic plan view, and FIG. 10C is a schematic cross-sectional view showing a second embodiment of the alignment mark of the present invention. [Figure 7] 13A is a schematic bottom view showing the state before resin is embedded in the opening, FIG. 13B is a schematic plan view, and FIG. 13C is a schematic cross-sectional view. Example 1

[0011] Hereinafter, the screen printing plate having alignment marks of the present invention will be described with reference to the accompanying drawings. First, an overview of the present invention will be briefly described. As shown in Figures 1(a) and (b), the present invention is configured so that an alignment mark portion formed on a screen plate consisting of a screen mesh having a printing pattern 11 fixed to a frame body 12 can be recognized by an imaging device 10 by irradiating illumination light 9 from one side 7. Next, FIG. 2 shows a first embodiment of the screen plate making method of the present invention. The screen printing plate can be produced by a known manufacturing method, for example, by stretching a screen mesh 1 over a picture frame-like frame with an appropriate tension and an appropriate angle, applying a photosensitive resin 2 to the screen mesh 1 portion, and then closely contacting a photomask on which a printing pattern has been formed onto the photosensitive resin 2 and exposing it to light, or by directly drawing a pattern on the photosensitive resin 2 using a direct drawing device or the like, and then developing and removing unnecessary parts of the photosensitive resin 2. Since the alignment mark is used to align the printed material with the screen printing, the positional accuracy of the printing pattern and the alignment mark is important. Therefore, it is desirable to form the alignment mark on the photomask on which the printing pattern is formed, and to expose the alignment mark and the printing pattern at the same time, or to use a direct imaging device to draw the alignment mark and the pattern on the photosensitive resin 2. After the development of the photosensitive resin, the photosensitive resin 2 is removed from the alignment mark portion, and the screen mesh 1 is exposed, which is called an opening 4 {Fig. 2(a)}. After filling the opening 4 with resin {Fig. 2(b)}, in the present invention, the alignment mark is formed by a coating layer 5 that covers the resin-filled opening 4 and the photosensitive resin 2 in the periphery with resin from the other surface 8 side {Fig. 2(c)}. The resin for forming the alignment mark is a resin with appropriate viscoelasticity, and the resin can be filled by pushing the resin into the opening 4 using a spatula or squeegee. Note that {Fig. 2(d)} is a schematic cross-sectional view showing the state in which the masking film of {Fig. 2(c)} has been removed. When filling the opening 4 with resin, it may be filled from one surface 7 side or from the other surface 8 side.

[0012] To explain in more detail, when forming the coating layer 5, the resin forming the coating layer 5 is masked with a masking film 6 or the like so that the resin does not adhere to unnecessary portions, and the resin is applied using a spatula or squeegee 3 in the same manner as when filling the opening 4 with the resin. There are no particular limitations on the thickness, shape, size, etc. of the coating layer 5, but it is desirable for the size to be at least wider than the opening 4, and preferably larger than the angle of view of the imaging device. Thereafter, the resin filling the opening 4 and the resin of the coating layer are cured by an appropriate method to obtain the alignment mark of the present invention {FIG. 2(d)}. There is no particular restriction on the order of operations and resin curing. The opening 4 may be filled with resin, the coating layer 5 may be formed, and then both resins may be cured at the same time, or the opening 4 may be filled with resin, cured, and then the coating layer 5 may be formed and the resin of the coating layer 5 may be cured. In order to make the contrast clearer, when the resin used to fill the alignment mark opening 4 is a white-based resin, the coating layer 5 is formed from a black-based resin, and when the resin used to fill the alignment mark opening 4 is a black-based resin, the coating layer 5 is formed from a white-based resin. Furthermore, when a colored resin is used, the color of the resin filling the alignment mark opening and the color of the resin forming the coating layer 5 are of a color system that has a complementary color relationship, for example, if the color of the resin of the opening 4 is a yellow-based resin, it is desirable that the color of the resin of the coating layer 5 is a blue-based resin. There is no particular restriction on the type or material of the resin used for the alignment mark, as long as it has appropriate printing resistance, solvent resistance, and water resistance. For example, adhesives such as cyanoacrylate, epoxy, acrylic, urethane, polyester, and polyamide adhesives, or combinations thereof, can be widely used. Also usable are ultraviolet-curable adhesives and ultraviolet-curable resins. In order to obtain a clearer contrast, pigments, dyes, various colorants, titanium oxide, carbon, graphene, and the like may be added to the resin.

[0013] FIG. 3(a) is an enlarged view showing the state before resin is filled into opening 4 of the alignment mark. The opening 4 of the alignment mark is formed and closed with a whitish resin, and the coating layer 5 formed on the other surface 8 is formed of a blackish resin. When this alignment mark portion is illuminated with illumination light from one surface 7 and recognized by an imaging device (CCD camera), first, the illumination light, which in the conventional technology passes through the photosensitive resin and the synthetic fiber screen mesh, is suppressed from passing by the coating layer 5 formed of a blackish resin on the other surface 8 side, and becomes a dark area {Fig. 3(c)}. On the other hand, the whitish resin of the opening 4 becomes a bright area, so an alignment mark with a clearer contrast than was possible with the conventional technology can be obtained. 5(a), (b), and (c), when the opening 4 is closed with a black-colored resin and the covering layer 5 is made of a white-colored resin, the illumination light that would have passed through the photosensitive resin and synthetic fiber screen mesh in the conventional technology is prevented from passing by the covering layer 5 made of a white-colored resin formed on the other surface 8, and becomes a bright area. On the other hand, the black-colored resin of the opening 4 becomes a dark area, so that an alignment mark with a clearer contrast than was possible with the conventional technology can be obtained. It should be noted that FIG. 3(b) is a view seen from one side.

[0014] Here, a modified example of the embodiment shown in FIG. 3 is shown in FIGS. 4(a), (b), and (c). This is an embodiment in which the shape of the opening 4 is cylindrical 4a (the photosensitive resin 2 is located at the center of the opening 4), and the rest is the same as the embodiment shown in FIG. As described above, by making the outer shape of the opening 4 approximately circular, when filling the opening 4 with resin using a spatula or squeegee, the filling with resin can be performed stably from any direction. Example 2

[0015] Next, a second embodiment is shown in FIG. This embodiment differs from the first embodiment in the shape of the opening 4, in that the outer shape of the opening 4 is rectangular, and a coating layer 5 larger than the outer shape of the opening 4 is formed on the other surface 8 side {Fig. 6(b)(c)}. By adopting such a shape, it is possible to obtain the same effect as in Example 1. For example, if the embedded resin is a whitish resin and the coating layer 5 formed on the other surface 8 is a blackish resin, the approximately circular central portion formed by the photosensitive resin 2 will be a dark area, and the peripheral portion filled with the whitish resin will be a bright area, resulting in an alignment mark with clearer contrast than was possible with conventional technology. Note that FIG. 6(b) is a view seen from one side. Also, although not shown in Figure 6, if the embedded resin is a black-colored resin and the coating layer 5 formed on the other surface 8 is a white-colored resin, the approximately circular central portion formed by the photosensitive resin 2 will become a bright area, and the peripheral area filled with the black-colored resin will become a dark area, resulting in an alignment mark with clearer contrast than was possible with conventional technology.

[0016] Here, a modified example of the embodiment shown in FIG. 6 is shown in FIGS. 7(a), (b), and (c). This is an embodiment in which the shape of the opening 4 is a square cylindrical shape 4b in which the photosensitive resin 2 is formed in a substantially circular shape in the center of the square opening, and the rest is the same as the embodiment shown in FIG.

[0017] The shape of the alignment mark of the present invention is not limited to the shapes of the first and second embodiments, and may be a different shape from the embodiments, such as a triangular shape, a rectangular shape, a polygonal shape, or a cross shape. By adopting the present invention, an alignment mark with a clear contrast can be obtained even if the shape is different. There is also no particular limit to the number of alignment marks formed on the screen plate.

[0018] In addition, in the first and second embodiments, one side 7 on which the lighting device and imaging device 10 are located is the side that comes into contact with the substrate to be printed in screen printing, i.e., the so-called printing surface side, and the other side 8 is the side on which the substrate is supplied and where the squeegee is operated, i.e., the so-called squeegee surface side; however, the lighting device and imaging device 10 may be installed on the squeegee surface side, with the squeegee surface side being one side 7 and the printing surface side being the other side 8.

[0019] In addition, there is no particular limitation on the position where the alignment mark is formed, and the position may be inside or outside the printing pattern. In addition, if the screen plate is a so-called combination plate made of a printing screen mesh and a support screen mesh, the alignment mark of the present invention and its surrounding area may be formed on the screen mesh of the support portion. [Industrial Applicability]

[0020] The alignment mark of the present invention can be used as an alignment mark not only for screen printing plates for flux printing, but also for all screen printing plates. [Explanation of symbols]

[0021] 1. Screen mesh 2...Photosensitive resin 3. Squeegee 4. Opening 5...Coating layer 6. Masking film 7...One side 8. The other side 9. Illumination 10 Imaging device (CCD camera) 11 Printing pattern 12...Frame body

Claims

1. In the screen plate making having an alignment mark, an opening for an alignment mark is formed using a photosensitive resin used in screen plate making, and the opening is filled with resin to block the opening, and a coating layer is formed on the other side of the screen plate, which is not the side that is the illumination light irradiation side and the alignment mark imaging side used when recognizing the alignment mark, so as to cover the resin-filled alignment mark and to cover an area larger than the size of the resin-filled alignment mark, characterized in that the resin used to fill the opening for the alignment mark is a white-colored resin, and the resin used to form the coating layer is a black-colored resin.

2. In the screen plate making having an alignment mark obtained by forming an opening for an alignment mark using a photosensitive resin used in screen plate making and filling the opening with resin to close the opening, a coating layer of resin is formed on the other side other than the side which is the illumination light irradiated side and the alignment mark imaging side used when recognizing the alignment mark, so as to cover the resin-filled alignment mark and to cover an area wider than the size of the resin-filled alignment mark, the resin used to fill the opening for the alignment mark is a black-colored resin and the resin used to form the coating layer is a white-colored resin.

3. In the screen plate making having an alignment mark obtained by forming an opening for an alignment mark using a photosensitive resin used in screen plate making and filling the opening with resin to close the opening, a coating layer of resin is formed on the other side other than the side which is the illumination light irradiation side and the alignment mark imaging side used when recognizing the alignment mark, so as to cover the resin-filled alignment mark and to cover an area larger than the size of the resin-filled alignment mark, the color of the resin used to fill the opening for the alignment mark and the color of the resin of the coating layer are formed in a color system that is complementary to each other.

Images