Printing plate and method for manufacturing same

Abstract

In order to provide a printing plate and a method for manufacturing the same in which film thickness unevenness in a material to be printed is less likely to be conspicuous, the printing plate (P) is provided with a printing protrusion (2) having a plurality of protrusions (3) formed on the top surface thereof, and the protrusions (3) are formed by light passing through a predetermined shape portion of a negative film and curing a photosensitive resin in a portion irradiated by the light. The predetermined shape is a shape (E) in which the positions of two or more dot patterns overlap each other on the same plane such that at least one of the dots of the dot pattern and at least one of the dots of a different dot pattern overlap each other.

Description

Technical Field

[0001] The present invention relates to a printing plate used for printing such as flexographic printing and a method for manufacturing the same. Background Art

[0002] A liquid crystal panel is configured to include an array substrate, a color filter substrate disposed opposite to the array substrate, and a liquid crystal layer sandwiched between the array substrate and the color filter substrate. The array substrate has, for example, a transparent substrate, a gate electrode, a gate insulating film, a semiconductor layer, a first protective film, a source electrode, a drain electrode, a second protective film, and a resin film.

[0003] Contact holes are formed in such an array substrate, and the above-mentioned transparent electrode is electrically connected to the drain electrode at the bottom of the contact hole.

[0004] Here, an alignment film formed of polyimide or the like is formed on the entire surface of the transparent electrode of the array substrate so as to fill the above-mentioned contact holes. As a method of forming an alignment film by coating an alignment film material such as polyimide on the transparent electrode of the array substrate, there are printing methods such as flexographic printing and inkjet methods.

[0005] As shown in Figure 8 (a) in a plan view and in Figure 8 (b) in Figure 8 (a) of the T-T cross-sectional view shown, a printing plate P1 used for flexographic printing generally includes a flat base portion 11 and a printing convex portion 12 formed at the central portion of the surface of the base portion 11. The printing convex portion 12 is the above-mentioned printing area, and a portion of the base portion 11 around the printing convex portion 12 does not participate in printing.

[0006] In addition, as shown in a cross-sectional view obtained by magnifying the main part of Figure 8 (b) in Figure 8 (c), on the top surface of the above-mentioned printing convex portion 12, a gap portion 14 is formed and distributed between a plurality of protrusions 13, and ink is held in the gap portion 14. Further, the printing plate P1 has flexibility so that it can be mounted along the circumferential side surface of the printing plate cylinder 51 (refer to Figure 7 ).

[0007] Figure 9 (a) is a perspective view showing a part of the protrusions 13 formed on the above-mentioned printing convex portion 12 of the above-mentioned general printing plate P1. Figure 9 (b) is a graph showing the height difference formed in the printing convex portion 12 due to the protrusions 13 and the gap portion 14 when the printing convex portion 12 is observed in a side cross-section. As shown in these figures, a plurality of protrusions 13 are orthogonally arranged on the printing convex portion 12. In addition, Figure 9The protrusions 13 shown in (a) are minute. As an example, 400 protrusions 13 are formed per inch (160,000 per square inch) on the printing convex part 12, and the depth of the gap part 14 between the protrusions 13 (the depth from the height of the top surface of the protrusion 13, the same hereinafter) is 15.8 μm. In addition, the unit volume of the printing plate P1 on which the above protrusions 13 are formed (indicating the capacity to hold ink) is 3.49 cm 3 / cm 2 .

[0008] Prior art documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-164979 SUMMARY OF THE INVENTION

[0011] Problems to be Solved by the Invention

[0012] When using the above-mentioned general printing plate P1 and applying ink (alignment film material) on the transparent electrode of the array substrate by flexographic printing, the ink is held in the gap part 14 formed between a plurality of orthogonally arranged protrusions 13, and the held ink is transferred from the printing plate P1 in this state to the object to be printed Q (array substrate, etc.) (see Figure 7 ).

[0013] When transferring the ink to the object to be printed Q in this way, there is a case where unevenness in the film thickness of the alignment film occurs locally. For example, there is a case where, around the contact hole formed in the array substrate, the ink is repelled due to surface tension, minute debris (residue) generated when forming the contact hole, etc., and the ink does not sufficiently enter the contact hole, and the film thickness of the alignment film at the periphery of the contact hole becomes uneven, resulting in uneven film thickness. Regarding the uneven film thickness, when the liquid crystal panel is in a light-emitting state (especially halftone), the uneven film thickness part becomes a bright spot and is easily visually recognized.

[0014] As Figure 6 shown, generally, the contact holes CH formed in the array substrate 20 are regularly arranged. And, as described above, since a plurality of protrusions 13 are also regularly arranged on the printing plate P1, the gap parts 14 holding the ink are also regularly arranged. Therefore, the parts where the gap parts 14 holding the ink come into contact with the contact holes CH, and the parts where the gap parts 14 holding the ink come into contact with the parts where ink repulsion occurs around the contact holes CH are regularly generated, unevenness in the thickness of the transferred ink is regularly generated, and further, unevenness in the film thickness of the alignment film is regularly generated.

[0015] When the generation position of the film thickness unevenness is regular, the film thickness unevenness tends to become conspicuous. That is, a tendency for the display quality of a liquid crystal panel manufactured using such an array substrate to deteriorate can be seen.

[0016] The present invention has been completed in view of such circumstances, and provides a printing plate in which film thickness unevenness in the printed body Q is less likely to be conspicuous, and a method for manufacturing the same.

[0017] Solution to the problem

[0018] In order to achieve the above object, the printing plate of the present invention has the following structure, and includes a printing convex portion having a plurality of protrusions formed on the top surface. Among them,

[0019] The above-mentioned protrusions are formed by the following method: placing a negative film having a predetermined shape on a photosensitive resin that becomes a printing plate, allowing light to pass through a predetermined shape portion of the negative film, and curing the photosensitive resin in the portion irradiated with the light.

[0020] The predetermined shape formed on the negative film is Shape (E), which is formed by overlapping the positions of two or more dot patterns on the same plane in such a way that at least one point of each dot pattern overlaps with at least one point of a different dot pattern.

[0021] In addition, the method for manufacturing the printing plate of the present invention uses the following method, which includes: a step of manufacturing a negative film having a predetermined shape, a step of placing the negative film on a photosensitive resin that becomes a printing plate, and a step of irradiating the photosensitive resin on which the negative film is placed with light passing through the negative film and curing the photosensitive resin at the position where the light passes through the negative film. Among them,

[0022] The above-mentioned printing plate includes a printing convex portion having a plurality of protrusions formed on the top surface.

[0023] In the above-mentioned negative film manufacturing step, Shape (E) is formed on the negative film, which is formed by overlapping the positions of two or more dot patterns on the same plane in such a way that at least one point of each dot pattern overlaps with at least one point of a different dot pattern.

[0024] In the above-mentioned photosensitive resin curing step, light passes through the Shape (E) portion formed on the negative film, cures the photosensitive resin irradiated with the light, and forms the above-mentioned protrusions using the cured portion.

[0025] When the generation position of the film thickness unevenness of the above-mentioned alignment film is regular, the film thickness unevenness is likely to be conspicuous. In other words, if the regularity is broken, the film thickness unevenness will become less conspicuous.

[0026] The present inventors focused on this point and found that it is possible to make the film thickness unevenness less conspicuous by suppressing the generation of the regularity of the above-mentioned film thickness unevenness.

[0027] That is, the present invention has the following [1] to [6] as its gist to achieve the above object.

[0028] [1] A printing plate having printing convex portions formed with a plurality of protrusions on the top surface, wherein

[0029] the above-mentioned protrusions are formed by placing a negative film having a predetermined shape on a photosensitive resin that becomes a printing plate, passing light through a predetermined shape portion of the above-mentioned negative film, and curing the photosensitive resin in the portion irradiated with the light.

[0030] The predetermined shape formed on the above-mentioned negative film is a shape (E), which is formed by overlapping each other in such a manner that at least one of the points of two or more dot patterns overlaps with at least one of the points of different dot patterns on the same plane.

[0031] [2] In the printing plate described in [1],

[0032] the top surface shape of the above-mentioned protrusion is the same as the (E) shape.

[0033] [3] In the printing plate described in [1] or [2],

[0034] in the above-mentioned dot pattern, the dots are arranged at equal intervals in the row direction and the column direction.

[0035] [4] In the printing plate described in any one of [1] to [3],

[0036] the shape of the above-mentioned (E) is a shape formed by changing the angle and overlapping each other in such a manner that the dot pattern M serving as a base and the dot pattern M1 overlapping with the base satisfy the following formula (1).

[0037] 0° < α1 < 90° ··· (1)

[0038] Wherein, in formula (1), α1 is the angle formed by an imaginary line M' connecting the centers of adjacent dots in the row direction of the dot pattern M and an imaginary line M1' connecting the centers of adjacent dots in the row direction of the dot pattern M1.

[0039] [5] In the printing plate described in [4],

[0040] There are a plurality of dot patterns overlapping with the above-mentioned substrate. When the intersection point of the imaginary lines connecting the centers of adjacent dots in the row direction in each dot pattern is set as RP, the imaginary line M' of the dot pattern that becomes the above-mentioned substrate passes through the intersection point RP, and the angles of the plurality of imaginary lines of the dot pattern overlapping with the substrate relative to the imaginary line M' of the dot pattern that becomes the above-mentioned substrate are changed from each other.

[0041] [6] A method for manufacturing a printing plate, comprising: a step of manufacturing a negative film having a predetermined shape, a step of placing the negative film on a photosensitive resin that becomes a printing plate, and a step of irradiating light through the negative film onto the photosensitive resin on which the negative film is placed and curing the photosensitive resin at the positions where the light passes through the negative film, wherein,

[0042] The above-mentioned printing plate is provided with printing convex portions, and a plurality of protrusions are formed on the top surface of the printing convex portions.

[0043] In the above-mentioned negative film manufacturing step, a shape (E) is formed on the negative film, and the shape (E) is formed by overlapping the positions of two or more dot patterns on the same plane in such a way that at least one of the points of one dot pattern and at least one of the points of a different dot pattern overlap each other.

[0044] In the above-mentioned photosensitive resin curing step, light passes through the shape (E) portion formed on the negative film, cures the photosensitive resin irradiated with the light, and forms the above-mentioned protrusions using the cured portions.

[0045] [7] In the method for manufacturing a printing plate described in [6],

[0046] In the above-mentioned dot pattern, the dots are arranged at equal intervals in the row direction and the column direction.

[0047] Effects of the invention

[0048] In the printing plate of the present invention, the top surface shape of the protrusion is formed to be the same as the shape (E shape), and the shape (E shape) is formed by overlapping the positions of two or more dot patterns on the same plane in such a way that at least one of the points of one dot pattern and at least one of the points of a different dot pattern overlap each other. Therefore, the regularity of the protrusions and the gap portions is broken, and the irregular generation of the film thickness unevenness of the alignment film provided on the array substrate can be suppressed. As a result, the above-mentioned film thickness unevenness can be made less conspicuous.

[0049] Among them, in the case where the dots in the above-mentioned dot pattern are arranged at equal intervals in the row direction and the column direction, the production of the dot pattern itself becomes easy, and the regularity of the above-mentioned protrusions and the gap portions can be broken more simply.

[0050] Furthermore, for the above-mentioned E shape, the angle α1 formed by the imaginary line M' connecting the centers of adjacent dots in the row direction in the dot pattern M which will become the base and the imaginary line M1' connecting the centers of adjacent dots in the row direction in the dot pattern M1 which overlaps with the above-mentioned base satisfies the following formula (1). In the above case, the regularity of the above-mentioned protrusions and gaps can be more reliably destroyed.

[0051] 0°<α1<90°···(1)

[0052] There are multiple dot patterns overlapping with the above-mentioned base. When the intersection point of the imaginary lines connecting the centers of adjacent dots in the row direction in these dot patterns is set to RP, the imaginary line M' of the dot pattern serving as the above-mentioned base passes through the intersection point RP, and the angles of the multiple imaginary lines of the dot pattern overlapping with the base relative to the imaginary line M' of the dot pattern serving as the above-mentioned base are changed. In the above-mentioned case, the regularity of the above-mentioned protrusions and gaps can be more reliably and simply destroyed.

[0053] In addition, the method for manufacturing a printing plate of the present invention includes: a process of placing a negative film having the shape (E) described below on a photosensitive resin serving as a printing plate, and a process of irradiating light onto the photosensitive resin on which the negative film is placed and curing the photosensitive resin at a position where the light passes through the negative film. As a result, the top surface shape of the protrusion can correspond to the shape (E) described below, and a printing plate can be formed in which the protrusions and gaps do not have regularity.

[0054] (E) is a shape in which two or more halftone dot patterns are overlapped with each other in a manner shifting their positions on the same plane.

[0055] In particular, when the dots in the dot pattern are arranged at equal intervals in the row direction and the column direction, the regularity of the protrusions and gaps can be more appropriately broken. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Figure 1 One embodiment of the printing plate of the present invention is schematically shown. Figure 1 (a) is a top view of the printing plate, Figure 1 (b) is Figure 1 (a) is an enlarged view of the main part of the RR section. Figure 1 (c) is Figure 1 (b) is an enlarged cross-sectional view of the main part.

[0057] Figure 2 (a) is a perspective view showing a portion of a protrusion formed on a printing convex portion provided in the printing plate of the present invention, Figure 2(b) is a graph showing the height difference formed in the printing convex portion due to the protrusions and the gap portions when the printing convex portion is observed in a side sectional view.

[0058] Figure 3 is a view showing an example of the (E) shape in the present invention.

[0059] Figure 4 (a) of shows an example of a dot pattern representing the arrangement of dots. Figure 4 (b) of shows the above dot pattern and the dot pattern obtained by changing the angle in the top view of the dot pattern with a reference point as the center of rotation.

[0060] Figure 5 is a view for explaining an example of the steps for manufacturing the (E) shape.

[0061] Figure 6 is an explanatory view showing the arrangement of contact holes formed in the array substrate.

[0062] Figure 7 is an explanatory view schematically showing a printing press using a printing plate.

[0063] Figure 8 schematically represents a conventional printing plate. Figure 8 (a) of is a top view of the printing plate. Figure 8 (b) of is Figure 8 a T-T cross-sectional view of (a) of. Figure 8 (c) of is Figure 8 a main part sectional enlarged view of (b) of.

[0064] Figure 9 (a) of is a perspective view showing a part of the protrusion formed in the printing convex portion. Figure 9 (b) of is a graph showing the height difference formed in the printing convex portion due to the protrusions and the gap portions when the printing convex portion is observed in a side sectional view.

[0065] Figure 10 (a) of is a view for explaining the negative film used in the manufacture of the printing plate of the present invention. Figure 10 (b) of is a view for explaining the method of manufacturing a printing plate using the above negative film. Detailed Embodiments

[0066] Next, embodiments of the present invention will be described in detail based on the drawings.

[0067] However, the present invention is not limited to the embodiments described below.

[0068] In addition, in the present invention, when expressed as "P or more" (P is an arbitrary number), it also includes the meaning of "preferably greater than P".

[0069] Figure 1 (a) of

[0069] is a top view showing an embodiment of the printing plate of the present invention, Figure 1 and (b) of

[0069] is Figure 1 a magnified view of the main part of the R-R cross section of (a) of

[0069] , Figure 1 and (c) of

[0069] is Figure 1 a magnified view of the main part cross section of (b) of

[0069] .

[0070] The printing plate P of an embodiment of the present invention includes a rectangular flat base 1 when viewed from above, and a rectangular printing convex portion 2 formed at the central portion of the surface of the base 1. A plurality of protrusions 3 and gap portions 4 are formed and distributed on the top surface of the printing convex portion 2 (refer to Figure 2 (a) of Figure 2 ). The printing plate P is used for flexographic printing. The printing plate P has flexibility so that it can be mounted on the circumferential side surface of the plate cylinder 51 of the printing press (refer to Figure 7 ). The forming material of the printing plate P is, for example, photosensitive resin, rubber, etc.

[0071] The above-mentioned base 1, printing convex portion 2 and protrusions 3 are integrally formed. And, in this embodiment, the direction of the arrow along the long side of the above-mentioned rectangular printing convex portion 2 when viewed from above is set as the printing direction. As shown below, on the top surface of the above-mentioned printing convex portion 2, gap portions 4 are formed and distributed between the plurality of protrusions 3, and ink is held in the gap portions 4.

[0072] That is, Figure 2 (a) of Figure 2 is a perspective view showing a part of the protrusions 3 formed on the printing convex portion 2, Figure 2 (b) of Figure 2 is a curve graph showing the height difference formed on the printing convex portion 2 due to the above-mentioned protrusions 3 and gap portions 4 when the printing convex portion 2 is viewed in a side cross section.

[0073] As Figure 1 (c) of Figure 1 and Figure 2 (b) of Figure 2 show, the protrusions 3 and the gap portions 4 are formed on the printing convex portion 2 in a state of disrupting regularity.

[0074] In addition, for the gap portion 4 formed between the protrusions 3 shown in Figure 2 (a) of Figure 2 , for example, its maximum depth is 15.7 μm, and the unit volume is 3.69 cm 3 / cm 2 , and it has a unit volume similar to that of a conventional printing plate in which a plurality of protrusions are regularly arranged.

[0075] Furthermore, Figure 1 (c) of Figure 1 , Figure 2 (a) of Figure 2 and Figure 2Examples of the shapes of the raised portions 2 for printing shown in (b) are respectively presented, and their shapes are not the same as each other.

[0076] Figure 3 It is a figure showing an example of the (E) shape in the present invention. Figure 3 The pattern RM shown is formed by overlapping each other on the same plane in such a way that only dot patterns of any number of two or more (in this example, 4, refer to Figure 5 ) are used, and at least one point of each dot pattern and at least one point of different dot patterns overlap. At this time, the dot patterns can be the same as each other or different in terms of the number of lines, etc. However, from the aspect of being able to further suppress the generation of moiré patterns, it is preferably to use dot patterns that are different from each other in terms of the number of lines, etc.

[0077] For the dot patterns in the present invention, any dot pattern can be used as long as the arrangement pattern of the dots has regularity, and it can also be a dot pattern with different regularities in the row direction and the column direction. However, if it is a dot pattern in which the dots are arranged at equal intervals in the row direction and the column direction, the (E) shape that disrupts the regularity can be more reliably produced by calculation.

[0078] In addition, generally, "dots" refer to dots arranged in a mesh pattern to represent the shading of a printed matter. However, in the present invention, it is not limited to dots for representing the shading of a printed matter, but refers to all dots arranged in a mesh pattern with a predetermined regularity.

[0079] The above-mentioned (E) shape can be produced as follows, for example.

[0080] Here, Figure 4 (a) shows a dot pattern M representing the arrangement of dots, Figure 4 (b) shows the dot pattern M serving as the base and the dot patterns M1 to M3 overlapping the above base.

[0081] And, as shown in Figure 4 (b), the case where the angle α1 formed by the imaginary line M' connecting the centers (Mc) of adjacent dots in the row direction in the dot pattern M serving as the base and the imaginary line M1' connecting the centers (M1c) of adjacent dots in the row direction in the dot pattern M1 overlapping the above base satisfies the following formula (1) is more preferable in terms of being able to further disrupt the regularity. In the case of using two or more dot patterns overlapping the above base, it is sufficient to make the angles formed by their respective imaginary lines and the imaginary line M' satisfy the following formula (1).

[0082] 0° < α1 < 90° ··· (1)

[0083] In particular, when there are multiple dot patterns (for example, dot patterns M1, M2, M3, ...) overlapping with the above-mentioned base, and the intersection point of the imaginary lines connecting the centers of adjacent dots in the row direction in these dot patterns (M1c, M2c, M3c, ...) is set to RP, the imaginary line M' of the dot pattern serving as the above-mentioned base passes through the intersection point RP, and if the angles of the multiple imaginary lines of the dot pattern overlapping with the base relative to the imaginary line M' of the dot pattern serving as the above-mentioned base are changed, the regularity can be disrupted more reliably, and therefore it is preferable.

[0084] For example, when using a dot pattern M as a base and three dot patterns (dot patterns M1, M2, M3) overlapping with the above-mentioned base, a total of four dot patterns, the angles α1, α2, α3 formed by the imaginary lines of these dot patterns are preferably set to the relationship of 0°<α1<α2<α3<90°, among which it is more preferred that the angles differ by more than 10°.

[0085] and, Figure 3 The pattern RM shown is as follows Figure 5 The dot patterns M, M1 to M3 of different specifications are overlapped as shown above. The drawing pattern RM is used as a negative film, and a negative film (mask) for printing plate formation is produced using the principle of positive-negative film.

[0086] In this way, by overlapping the dot patterns M, M1-M3, a disrupted regularity pattern RM is formed. While an example of using four dot patterns M, M1-M3 to form the pattern RM is shown here, the pattern RM can be formed using two or more dot patterns and is not limited to four dot patterns. By varying the angle at which multiple dot patterns overlap, the shape of the pattern RM formed by overlapping multiple dot patterns can be infinite. However, it is preferable to select a combination that minimizes the occurrence of unusual unevenness.

[0087] However, in order to reliably avoid interference with the regularity of the arrangement of the contact holes CH formed in the array substrate 20 and suppress regular occurrence of uneven film thickness, it is preferable to use a pattern RM in which four or more dot patterns are overlapped.

[0088] The method for manufacturing the printing plate P can be, for example, a photolithography method, which includes: a process of making a negative film having the above-mentioned pattern RM (E shape) with disrupted regularity, a process of placing the above-mentioned negative film on a photosensitive resin that becomes the printing plate P, and a process of irradiating the above-mentioned photosensitive resin on which the above-mentioned negative film is placed through the above-mentioned negative film and curing the above-mentioned photosensitive resin at the position where the light passes through the above-mentioned negative film.

[0089] Further, in the above-described negative film production process, a shape (E) is formed on the negative film. The shape (E) is formed by overlapping the positions of two or more dot patterns on the same plane in such a way that at least one point of each dot pattern overlaps with at least one point of a different dot pattern. If so, in the above-described photosensitive resin curing process, the part where light passes through the shape (E) formed on the negative film and cures the photosensitive resin irradiated by the light becomes the above-mentioned protrusion 3. In addition, the part of the photosensitive resin where light does not pass through the negative film and is not irradiated by the light becomes the above-mentioned gap part 4.

[0090] Figure 10 (a) of Figure 10 (b) is a diagram for explaining the manufacturing method of the above-described printing plate P using photolithography.

[0091] First, as shown in Figure 10 (a), a negative film is produced in which a shape (E) is formed as a light-transmitting part. The shape (E) is formed by overlapping the positions of two or more dot patterns on the same plane in such a way that at least one point of each dot pattern overlaps with at least one point of a different dot pattern. In addition, in Figure 10 (a), Figure 10 (b), the light-transmitting part of the negative film is shown as blank.

[0092] Next, as shown in Figure 10 (b), a photosensitive resin 6 on which a negative film 5 is placed is disposed between a worktable glass 8 and a work glass cover 7, and light is irradiated in the direction shown by the arrow. The irradiated light passes through the worktable glass 8 and the above-mentioned shape (E), and the photosensitive resin 6 is partially cured by the transmitted light.

[0093] And, in the above-mentioned photosensitive resin 6, the part other than the cured part is washed and removed. Thus, a printing plate P having the above-mentioned protrusion 3 and gap part 4 and having the same shape as the above-mentioned (E) shape on the top surface 3a of the protrusion 3 can be manufactured (refer to Figure 2 (a)).

[0094] The obtained printing plate P is suitable for use as a printing plate for flexographic printing. Figure 7 An example of a flexographic printing machine is shown. The flexographic printing machine includes: a cylindrical plate cylinder 51 on which the printing plate P is mounted, an anilox roll 52 for attaching ink to the above-mentioned printing plate P, an ink supply device 53 for supplying ink to the surface of the anilox roll 52, a doctor blade 54 for scraping off the remaining ink on the surface of the anilox roll 52, and a printing table 55 on which a printing object Q to be printed is placed.

[0095] And, the flexographic printing using the above printing press is performed as follows. That is, the printing plate P is mounted on the circumferential side surface of the plate cylinder 51, the plate cylinder 51 is rotated, and at the same time, the ink supplied from the ink supply device 53 is attached to the printing area of the printing plate P by means of the anilox roll 52, and the attached ink is transferred to the object to be printed Q such as a glass substrate placed on the printing table 55, thereby performing printing. At this time, the printing table 55 is slid in the direction of the arrow in synchronization with the rotation of the plate cylinder 51.

[0096] Here, as Figure 1 shown in (c) of, in the printing plate P, on the top surface of the printing convex portion 2, gap portions 4 are distributed and formed between the plurality of protrusions 3, and the ink is held in the gap portions 4.

[0097] When transferring the ink to the object to be printed Q in this way, generally, when the object to be printed Q is the array substrate 20, there is a situation where, around the contact hole CH, the ink is repelled due to surface tension, minute debris (residue) generated when forming the contact hole, etc., the ink does not sufficiently enter the contact hole CH, the film thickness of the ink at the periphery of the contact hole CH becomes uneven, and film thickness unevenness of the obtained alignment film occurs.

[0098] However, on the printing convex portion 2 of the printing plate P of the present invention, the protrusions 3 and the gap portions 4 are formed in a state of disrupting the regularity. Therefore, even if the contact holes CH are formed in a regular arrangement on the array substrate 20, the film thickness unevenness of the alignment film does not regularly occur, and even if film thickness unevenness occurs, it is not easily noticeable.

[0099] In this way, according to the flexographic printing using the printing plate P of the present invention, the alignment film formed on the array substrate used in the liquid crystal panel can be formed in a state where the regular generation of film thickness unevenness is suppressed.

[0100] In the above embodiments, specific modes in the present invention are shown, but the above embodiments are only illustrative and are not construed in a limiting manner. Various modifications known to those skilled in the art are within the scope of the present invention.

[0101] Industrial Applicability

[0102] The printing plate of the present invention can be usefully utilized as a printing plate in which film thickness unevenness is not easily noticeable.

[0103] Description of Reference Numerals

[0104] P, printing plate; 2, printing convex portion; 3, protrusion; 3a, top surface of the protrusion; 4, gap portion.

Claims

1. A printing plate having printing convex portions with a plurality of protrusions formed on the top surface, wherein the protrusions are formed by placing a negative having a predetermined shape on a photosensitive resin that becomes the printing plate, passing light through a portion of the negative having the predetermined shape, and curing the photosensitive resin in the portion irradiated with the light. The predetermined shape formed on the negative is Shape (E), which is formed by overlapping two or more dot patterns on the same plane such that at least one point of each dot pattern overlaps with at least one point of a different dot pattern.

2. The printing plate according to claim 1, wherein the top surface shape of the protrusion is the same as Shape (E).

3. The printing plate according to claim 1 or 2, wherein in the dot pattern, the dots are arranged at equal intervals in the row direction and the column direction.

4. The printing plate according to any one of claims 1 to 3, wherein Shape (E) is a shape formed by changing the angle and overlapping a base dot pattern M and a dot pattern M1 overlapping with the base so as to satisfy the following formula (1). 0°＜α1＜90°···(1) In formula (1), α1 is the angle formed by an imaginary line M' connecting the centers of adjacent dots in the row direction of dot pattern M and an imaginary line M1' connecting the centers of adjacent dots in the row direction of dot pattern M1.

5. The printing plate according to claim 4, wherein there are a plurality of dot patterns overlapping with the base. When the intersection point of the imaginary lines connecting the centers of adjacent dots in the row direction of each dot pattern is set as RP, the imaginary line M' of the dot pattern serving as the base passes through the intersection point RP, and the angles of a plurality of imaginary lines of the dot patterns overlapping with the base with respect to the imaginary line M' of the dot pattern serving as the base are changed from each other.

6. A method for manufacturing a printing plate, comprising: a step of producing a negative having a predetermined shape, a step of placing the negative on a photosensitive resin that becomes the printing plate, and a step of passing light through the negative to irradiate the photosensitive resin on which the negative is placed and curing the photosensitive resin at the position where the light passes through the negative, wherein the printing plate has printing convex portions with a plurality of protrusions formed on the top surface, in the negative production step, Shape (E) is formed on the negative, which is formed by overlapping two or more dot patterns on the same plane such that at least one point of each dot pattern overlaps with at least one point of a different dot pattern. in the photosensitive resin curing step, light passes through the Shape (E) portion formed on the negative, cures the photosensitive resin irradiated with the light, and forms the protrusions using the cured portion.

7. The method for manufacturing a printing plate according to claim 6, wherein in the dot pattern, the dots are arranged at equal intervals in the row direction and the column direction.

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