Printing plate and method for manufacturing the same

Abstract

Provided is a printing plate in which film thickness unevenness in a printed body is less conspicuous, and a method for manufacturing the same, and thus the printing plate (P) is provided with a printing convex portion (2) having a plurality of protrusions (3) formed on a top surface, the protrusions (3) being formed by passing light through a predetermined shape portion of a negative and curing a photosensitive resin of a portion irradiated with the light, the predetermined shape being a shape (E) in which two or more dot patterns are overlapped with each other on the same plane such that at least one of dots possessed by each dot pattern and at least one of dots possessed by a different dot pattern are overlapped.

Description

Technical Field

[0001] This invention relates to a printing plate used in flexographic printing and other printing processes, and a method for manufacturing the same. Background Technology

[0002] The 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, for example, has 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 on such an array substrate, and the aforementioned transparent electrode is electrically connected to the drain electrode at the bottom of the contact hole.

[0004] Here, an alignment film made of polyimide or the like is formed on the entire surface of the transparent electrode of the array substrate in a manner that fills the aforementioned contact holes. Methods for forming the alignment film by coating the transparent electrode of the array substrate with an alignment film material such as polyimide include flexible printing and inkjet printing.

[0005] As in Figure 8 In (a) a top view, in Figure 8 (b) of Figure 8 As shown in the TT cross-sectional view of (a), the printing plate P1 used for flexographic printing typically has a flat base 11 and a printing protrusion 12 formed in the center of the surface of the base 11. The printing protrusion 12 is the aforementioned printing area, and the portion of the base 11 surrounding the printing protrusion 12 does not participate in printing.

[0006] Additionally, as in Figure 8 In (c) Figure 8 As shown in the enlarged cross-sectional view of (b), on the top surface of the printing protrusion 12, gaps 14 are formed between a plurality of protrusions 13, and ink is retained in these gaps 14. Furthermore, the printing plate P1 is flexible so that it can move along the printing plate cylinder 51 (see reference 12). Figure 7 Install it on the surrounding side.

[0007] Figure 9 (a) is a perspective view showing a portion of the protrusion 13 formed by the printing protrusion 12 of the general printing plate P1 described above. Figure 9 (b) is a graph showing the height difference of the printing protrusion 12 caused by the protrusions 13 and the gaps 14 when viewed in a side cross-section. As shown in these figures, multiple protrusions 13 are orthogonally arranged on the printing protrusion 12. Furthermore, Figure 9The protrusions 13 shown in (a) are minute. For example, 400 protrusions 13 are formed per inch (160,000 per square inch) in the printing protrusions 12, and the depth of the gaps 14 between the protrusions 13 (the depth from the height of the top surface of the protrusion 13, the same applies below) is 15.8 μm. Furthermore, the unit volume (indicating the ink holding capacity) of the printing plate P1 with the aforementioned protrusions 13 is 3.49 cm³. 3 / cm 2 .

[0008] Existing technical documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 2017-164979 Summary of the Invention

[0011] The problem the invention aims to solve

[0012] When using the general printing plate P1 described above and applying ink (alignment film material) to the transparent electrodes of the array substrate using flexible printing, the ink is held in the gaps 14 formed between the orthogonally arranged protrusions 13, and the held ink is transferred from the printing plate P1 in this state to the substrate Q (array substrate, etc.) (see reference). Figure 7 ).

[0013] When transferring ink onto the substrate Q in this manner, uneven thickness of the alignment film can occur in certain areas. For example, around the contact holes formed on the array substrate, ink may be repelled due to surface tension and tiny debris (residue) generated during contact hole formation, preventing sufficient ink penetration into the contact holes. This results in uneven thickness of the alignment film around the contact holes. When the liquid crystal panel is in an emitting state (especially in halftone mode), these uneven areas appear as bright spots and are easily visually identifiable.

[0014] like Figure 6 As shown, the contact holes CH formed on the array substrate 20 are typically arranged regularly. Furthermore, as described above, since multiple protrusions 13 are also regularly arranged on the printing plate P1, the ink-holding gaps 14 are also regularly arranged. Therefore, the portions of the ink-holding gaps 14 that abut against the contact holes CH, and the portions of the ink-holding gaps 14 that abut against the portions where ink repulsion occurs around the contact holes CH, are respectively regularly generated, resulting in a regular unevenness in the thickness of the transferred ink, and consequently, a regular unevenness in the thickness of the alignment film.

[0015] When the locations of film thickness unevenness are regular, the unevenness tends to become noticeable. That is, a tendency to reduce the display quality of liquid crystal panels manufactured using such array substrates can be observed.

[0016] The present invention was made in view of the following situation, providing a printing plate with non-obvious film thickness unevenness in the printed body Q and a method for manufacturing the same.

[0017] Solution for solving the problem

[0018] To achieve the above objectives, the printing plate of the present invention has the following structure: it includes a printing protrusion, wherein the printing protrusion has a plurality of protrusions formed on its top surface, wherein...

[0019] The aforementioned protrusions are formed by placing a negative film with a predetermined shape onto a photosensitive resin that serves as a printing plate, allowing light to pass through the predetermined shaped portion of the negative film, thereby curing the photosensitive resin in the portion illuminated by the light.

[0020] The predetermined shape formed on the above negative is called shape (E), which is formed by overlapping two or more dot patterns on the same plane such that the positions of each other overlap at least one of the points of each dot pattern and at least one of the points of each different dot pattern.

[0021] Furthermore, the method for manufacturing the printing plate of the present invention comprises the following steps: a step of producing a negative film having a predetermined shape; a step of placing the negative film on a photosensitive resin that serves as a printing plate; and a step of irradiating the photosensitive resin on which the negative film is placed by passing light through the negative film and curing the photosensitive resin at the location where the light passes through the negative film, wherein...

[0022] The aforementioned printing plate has printing protrusions, which have multiple protrusions formed on their top surface.

[0023] In the aforementioned negative film production process, a shape (E) is formed on the negative film by overlapping two or more dot patterns on the same plane such that at least one of the dots in each dot pattern overlaps with at least one of the dots in each different dot pattern.

[0024] In the above-mentioned photosensitive resin curing process, light passes through the shape (E) portion formed on the above-mentioned negative film, causing the photosensitive resin irradiated by the light to cure, and the above-mentioned protrusion is formed by using the cured portion.

[0025] When the location of uneven film thickness in the aforementioned oriented film is regular, the unevenness is easily noticeable. In other words, if this regularity is disrupted, the unevenness becomes less noticeable.

[0026] The inventors focused on this point and discovered that by suppressing the regularity of the above-mentioned film thickness unevenness, the film thickness unevenness can be made less noticeable.

[0027] That is, the present invention takes the following [1] to [7] as its main points in order to achieve the above-mentioned objectives.

[0028] [1] A printing plate having a printing protrusion having a plurality of protrusions formed on its top surface, wherein...

[0029] The aforementioned protrusions are formed by placing a negative film with a predetermined shape onto a photosensitive resin that serves as a printing plate, allowing light to pass through the predetermined shaped portion of the negative film, thereby curing the photosensitive resin in the portion illuminated by the light.

[0030] The predetermined shape formed on the above negative is called shape (E), which is formed by overlapping two or more dot patterns on the same plane such that the positions of each other overlap at least one of the points of each dot pattern and at least one of the points of each different dot pattern.

[0031] [2] In the printed version described in [1],

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

[0033] [3] In the printed version described in [1] or [2],

[0034] In the above dot pattern, the dots are arranged at equal intervals along the row and column directions.

[0035] [4] In any of the printed versions described in [1] to [3],

[0036] The shape described above (E) is formed by changing the angles of the halftone pattern M that serves as the base and the halftone pattern M1 that overlaps with the base in a manner that satisfies the following formula (1) and overlaps with each other.

[0037] 0°<α1<90°···(1)

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

[0039] [5] In the printed version described in [4],

[0040] Having multiple dot patterns that overlap with the aforementioned base, when the intersection 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 that becomes the base passes through the intersection RP, changing the angles of the multiple imaginary lines of the dot patterns that overlap with the base relative to the imaginary line M' of the dot pattern that becomes the base.

[0041] [6] A method for manufacturing a printing plate, comprising: a step of making a negative having a predetermined shape; a step of placing the negative on a photosensitive resin that serves as a printing plate; and a step of irradiating the photosensitive resin on which the negative is placed by passing light through the negative and curing the photosensitive resin at the location where the light passes through the negative, wherein...

[0042] The aforementioned printing plate has printing protrusions, which have multiple protrusions formed on their top surface.

[0043] In the aforementioned negative film production process, a shape (E) is formed on the negative film by overlapping two or more dot patterns on the same plane such that at least one of the dots in each dot pattern overlaps with at least one of the dots in each different dot pattern.

[0044] In the above-mentioned photosensitive resin curing process, light passes through the shape (E) portion formed on the above-mentioned negative film, causing the photosensitive resin irradiated by the light to cure, and the above-mentioned protrusion is formed by using the cured portion.

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

[0046] In the above dot pattern, the dots are arranged at equal intervals along the row and column directions.

[0047] The 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), which is formed by overlapping two or more dot patterns on the same plane such that at least one of the points of each dot pattern overlaps with at least one of the points of different dot patterns. Therefore, the regular breakage of the protrusion and the gap can suppress the occurrence of uneven film thickness of the alignment film provided on the array substrate. As a result, the aforementioned uneven film thickness is less noticeable.

[0049] In the case where the dots in the dot pattern are arranged at equal intervals along the row and column directions, the production of the dot pattern itself becomes easier, and the regularity of the protrusions and gaps can be broken more easily.

[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 of the dot pattern M that will become the base and the imaginary line M1' connecting the centers of adjacent dots in the row direction of the dot pattern M1 that overlaps with the above-mentioned base satisfies the following equation (1). In the above case, the regularity of the above-mentioned protrusions and gaps can be broken more reliably.

[0051] 0°<α1<90°···(1)

[0052] Having multiple dot patterns that overlap with the aforementioned base, when the intersection of the imaginary lines connecting the centers of adjacent dots in the row direction of these dot patterns is set as RP, the imaginary line M' of the dot pattern that forms the base passes through the intersection RP, changing the angles of the multiple imaginary lines of the dot pattern that overlap with the base relative to the imaginary line M' of the dot pattern that forms the base. In this case, the regularity of the protrusions and gaps can be broken more reliably and easily.

[0053] Furthermore, the method for manufacturing the printing plate of the present invention includes a step of placing a negative film having the shape described below (E) onto a photosensitive resin that serves as a printing plate, and a step of irradiating the photosensitive resin on which the negative film is placed with light and curing the photosensitive resin at the location where the light passes through the negative film. As a result, the top surface shape of the protrusion can correspond to the shape described below (E), and a printing plate with irregular protrusions and gaps can be formed.

[0054] (E) is a shape in which two or more dot patterns overlap each other on the same plane with their positions staggered.

[0055] In the case where the dots in the above dot pattern are arranged at equal intervals along the row and column directions, the regularity of the protrusions and gaps can be further appropriately disrupted. Attached Figure Description

[0056] Figure 1 This schematically illustrates one embodiment of the printing plate of the present invention. Figure 1 (a) is a top view of the printed plate. Figure 1 (b) is Figure 1 Enlarged view of the main part at the RR section of (a), Figure 1 (c) is Figure 1 Enlarged cross-sectional view of the main part of (b).

[0057] Figure 2 (a) is a perspective view showing a portion of the protrusion formed by the printing relief provided in the printing plate of the present invention. Figure 2(b) is a graph showing the height difference of the printing protrusion caused by the protrusion and gap when viewed in a side section.

[0058] Figure 3 This is a diagram illustrating an example of the shape (E) in this invention.

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

[0060] Figure 5 This is an example diagram illustrating the steps involved in creating shape (E).

[0061] Figure 6 This is an explanatory diagram showing the arrangement of contact holes formed on the array substrate.

[0062] Figure 7 It is an illustrative diagram showing a printing press using printing plates.

[0063] Figure 8 This is a schematic representation of previous printing plates. Figure 8 (a) is a top view of the printed plate. Figure 8 (b) is Figure 8 (a) TT sectional view, Figure 8 (c) is Figure 8 Enlarged cross-sectional view of the main part of (b).

[0064] Figure 9 (a) is a three-dimensional view showing a portion of the protrusion formed in the printing relief. Figure 9 (b) is a graph showing the height difference of the printing protrusion caused by the protrusion and gap when viewed in a side section.

[0065] Figure 10 Figure (a) is a diagram illustrating the negative used in the manufacture of the printing plate of the present invention. Figure 10 (b) is a diagram illustrating the method of manufacturing a printing plate using the above-described negative. Detailed Implementation

[0066] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

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

[0068] Furthermore, in this invention, when expressed as "P or more" (P being any number), it also includes the meaning of "preferably greater than P".

[0069] Figure 1 (a) is a top view showing one embodiment of the printed version of the present invention. Figure 1 (b) is Figure 1 Enlarged view of the main part of the RR section in (a), Figure 1 (c) is Figure 1 Enlarged cross-sectional view of the main part of (b).

[0070] In one embodiment of the present invention, the printing plate P comprises a base 1 that is rectangular in shape when viewed from above, and a printing protrusion 2 that is rectangular in shape when viewed from above and formed at the center of the surface of the base 1. A plurality of protrusions 3 and gaps 4 are formed on the top surface of the printing protrusion 2. (See reference 1) Figure 2 (a)). The printing plate P is used for flexographic printing. The aforementioned printing plate P is flexible so that it can be mounted on the peripheral side of the printing plate cylinder 51 of the printing press (see reference). Figure 7 The material used to form the printing plate P is, for example, photosensitive resin, rubber, etc.

[0071] The base 1, printing protrusion 2, and protrusion 3 are integrally formed. Furthermore, in this embodiment, the direction of the arrow along the long side of the rectangular printing protrusion 2 (viewed from above) is set as the printing direction. As shown below, gaps 4 are formed between a plurality of protrusions 3 on the top surface of the printing protrusion 2, and ink is held in these gaps 4.

[0072] Right now, Figure 2 (a) is a perspective view showing a portion of the protrusion 3 formed in the printing relief 2. Figure 2 (b) is a graph showing the height difference formed in the printing protrusion 2 due to the protrusion 3 and the gap 4 when viewed in a side section.

[0073] like Figure 1 (c) and Figure 2 As shown in (b), the protrusion 3 and the gap 4 are formed on the printing protrusion 2 in a disordered and irregular manner.

[0074] In addition, for in Figure 2 Regarding the gap 4 formed between the protrusions 3 shown in (a), for example, its maximum depth is 15.7 μm and the unit volume is 3.69 cm. 3 / cm 2 It has a unit volume similar to that of conventional printing plates with multiple protrusions arranged in a regular pattern.

[0075] also, Figure 1 (c) Figure 2 (a) and Figure 2The shapes of the printing protrusions 2 shown in (b) are examples, and their shapes are not consistent with each other.

[0076] Figure 3 This is a diagram illustrating an example of the shape (E) in this invention. Figure 3 The pattern RM shown is any number of patterns using more than two (four in this example, see reference). Figure 5 The dots are formed by overlapping each other on the same plane in such a way that at least one of the dots in the dot pattern overlaps with at least one of the dots in different dot patterns. In this case, the dot patterns can be identical or different in terms of line count, etc. However, from the perspective of further suppressing the generation of moiré patterns, it is preferable to use dot patterns that are different in terms of line count, etc.

[0077] Regarding the dot pattern in this invention, any dot pattern can be used as long as the arrangement of the dots is regular, or the regularity of the dot pattern can differ in the row and column directions. However, if the dot pattern is a dot pattern in which the dots are arranged at equal intervals along the row and column directions, then the irregular (E) shape can be produced more reliably through calculation.

[0078] Furthermore, while "dots" typically refer to dots arranged in a grid pattern to represent the density of printed matter, in this invention, it is not limited to dots representing the density of printed matter, but refers to all dots arranged in a grid pattern with predetermined regularity.

[0079] The shape described above (E) can be made, for example, as follows.

[0080] Here, Figure 4 (a) shows a dot pattern M representing the arrangement of dots. Figure 4 (b) shows the dot pattern M that forms the base and the dot patterns M1 to M3 that overlap with the base.

[0081] And, as Figure 4 As shown in (b), it is preferable that the angle α1 formed by the imaginary line M' connecting the centers (Mc) of adjacent dots in the row direction of the halftone pattern M that will become the base, and the imaginary line M1' connecting the centers (M1c) of adjacent dots in the row direction of the halftone pattern M1 that overlaps with the base satisfies the following equation (1). This is more desirable in terms of further disrupting regularity. When using two or more halftone patterns that overlap with the base, it is sufficient to make the angle between the respective imaginary lines and the imaginary line M' satisfy the following equation (1).

[0082] 0°<α1<90°···(1)

[0083] In particular, when multiple dot patterns (e.g., dot patterns M1, M2, M3, ...) that overlap with the aforementioned base are used, and the intersection of the imaginary lines connecting the centers (M1c, M2c, M3c, ...) of adjacent dots in the row direction of these dot patterns is set as RP, the imaginary line M' of the dot pattern that becomes the base passes through the intersection RP. If the angles of the multiple imaginary lines of the dot patterns that overlap with the base relative to the imaginary line M' of the dot pattern that becomes the base are changed, the regularity can be disrupted more reliably, which is therefore preferable.

[0084] For example, when using a dot pattern M that serves as the base, and three dot patterns (dot patterns M1, M2, and M3) that overlap with the base, for a total of four dot patterns, the angles α1, α2, and α3 formed by the imaginary lines of these dot patterns are preferably set to a relationship of 0° < α1 < α2 < α3 < 90°, and more preferably, the angles between them differ by 10° or more.

[0085] and, Figure 3 The pattern RM shown is as follows Figure 5 The above-mentioned halftone patterns M, M1 to M3 of different specifications are superimposed to form the printing plate. The pattern RM is drawn as a negative, and the negative (mask) for printing plate formation is made using the principle of positive and negative films.

[0086] In this way, by overlapping the halftone patterns M, M1 to M3, a disordered pattern RM is formed. Here, an example is shown using four halftone patterns M, M1 to M3 to form the pattern RM, but the pattern RM can be formed using any two or more halftone patterns, and is not limited to four. By varying the angle at which multiple halftone patterns are overlapped, the shape of the pattern RM formed by overlapping multiple halftone patterns can be infinite, but it is preferable to choose a combination that minimizes the production of unusual unevenness.

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

[0088] A method for manufacturing the printing plate P can be exemplified by photolithography, which includes: a step of making a negative film with the aforementioned pattern RM (E shape) formed by randomization; a step of placing the negative film on a photosensitive resin that becomes the printing plate P; and a step of irradiating the photosensitive resin on which the negative film is placed by passing light through the negative film and curing the photosensitive resin at the location where the light passes through the negative film.

[0089] Furthermore, in the aforementioned negative film production process, a shape (E) is formed on the negative film. This shape (E) is formed by overlapping two or more dot patterns on the same plane such that at least one of the dots in each dot pattern overlaps with at least one of the dots in each different dot pattern. If this is the case, then in the aforementioned photosensitive resin curing process, the portion of the photosensitive resin that is irradiated by light through the shape (E) formed on the negative film and cured becomes the aforementioned protrusion 3. Additionally, the portion of the photosensitive resin that is not irradiated by light because light does not pass through the negative film becomes the aforementioned gap 4.

[0090] Figure 10 of (a), Figure 10 (b) is a diagram illustrating the manufacturing method of the above-mentioned printing plate P using photolithography.

[0091] First, such as Figure 10 As shown in (a), a negative film is made to form a shape (E) as the light-transmitting portion. This shape (E) is formed by overlapping two or more dot patterns on the same plane such that their positions overlap with each other in a manner that at least one of the dots in each dot pattern overlaps with at least one of the dots in each different dot pattern. Furthermore, in Figure 10 of (a), Figure 10 In (b), the portion of the negative through which light passes is indicated by blank space.

[0092] Furthermore, such as Figure 10 As shown in (b), a photosensitive resin 6, on which a negative film 5 is placed, is disposed between the workpiece stage glass 8 and the workpiece glass cover 7, and light is irradiated in the direction indicated by the arrow. The irradiated light passes through the workpiece stage glass 8 and the aforementioned shape (E), and the photosensitive resin 6 is locally cured using the transmitted light.

[0093] Furthermore, in the aforementioned photosensitive resin 6, the portion other than the cured portion is cleaned and removed, thereby enabling the manufacture of a printing plate P (refer to) having the aforementioned protrusions 3 and gaps 4 formed thereon, and the shape of the top surface 3a of the aforementioned protrusions 3 being the same as the shape described in (E). 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 press is shown. The flexographic printing press includes: a cylindrical printing plate cylinder 51 on which a printing plate P is mounted; an anilox roller 52 on which ink is applied to the printing plate P; an ink supply device 53 for supplying ink to the surface of the anilox roller 52; a doctor blade 54 for scraping off any remaining ink from the surface of the anilox roller 52; and a printing table 55 on which the printable object Q is placed.

[0095] Furthermore, flexographic printing using the aforementioned printing press is performed as follows: A printing plate P is mounted on the circumferential side of a printing plate cylinder 51, which is then rotated. Simultaneously, ink supplied from the ink supply device 53 is applied to the printing area of ​​the printing plate P via an anilox roller 52. This applied ink is then transferred to a substrate Q, such as a glass substrate, placed on a printing table 55, thereby performing printing. At this time, the printing table 55 slides in the direction of the arrow, synchronized with the rotation of the printing plate cylinder 51.

[0096] Here, as Figure 1 As shown in (c), in the printing plate P, on the top surface of the printing protrusion 2, gaps 4 are formed between a plurality of protrusions 3, and ink is retained in the gaps 4.

[0097] When ink is transferred to the substrate Q in this way, typically, when the substrate Q is an array substrate 20, the ink is repelled around the contact hole CH due to surface tension, tiny debris (residue) generated when forming the contact hole, etc., and the ink does not fully enter the contact hole CH. As a result, the film thickness of the ink around the contact hole CH becomes uneven, resulting in uneven film thickness of the obtained alignment film.

[0098] However, on the printing protrusion 2 of the printing plate P of the present invention, the protrusion 3 and the gap 4 are formed in a disordered regularity. Therefore, even if the contact hole CH is formed on the array substrate 20 in a regular configuration, the unevenness of the film thickness of the alignment film will not be generated regularly, and even if unevenness of film thickness is generated, it will not be noticeable.

[0099] Thus, by using the flexible 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 that suppresses the occurrence of uneven film thickness.

[0100] The above embodiments illustrate specific aspects of the present invention, but these embodiments are merely illustrative and not intended to be limiting. Various modifications known to those skilled in the art are within the scope of this invention.

[0101] Industrial availability

[0102] The printing plate of the present invention can be usefully used as a printing plate for printing plates with uneven film thickness that are not easily noticeable.

[0103] Explanation of reference numerals in the attached figures

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

Claims

1. A printing plate having a printing protrusion with a plurality of protrusions formed on a 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 predetermined shape portion of the negative, and curing the photosensitive resin of a portion irradiated with the light, the predetermined shape formed on the negative is a shape (E) in which two or more dot patterns are overlapped with each other in the same plane in a manner that positions of the dot patterns are overlapped with each other at least one of dots possessed by each dot pattern and at least one of dots possessed by a different dot pattern.

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

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

4. The printing plate according to claim 1 or 2, wherein the shape (E) is a shape in which a dot pattern M that becomes a base and a dot pattern Ml that is overlapped with the base are overlapped with each other in a manner that an angle is changed to satisfy the following formula (1), wherein in the formula (1), a1 is an angle formed by an imaginary line M' that connects centers of adjacent dots in a row direction in the dot pattern M and an imaginary line M1' that connects centers of adjacent dots in a row direction in the dot pattern Ml.

5. The printing plate according to claim 4, wherein a plurality of dot patterns that are overlapped with the base are provided, and when an intersection of imaginary lines that connect centers of adjacent dots in a row direction in each dot pattern is set as RP, an imaginary line M' of the dot pattern that becomes the base passes through the intersection RP, and angles of a plurality of imaginary lines of the dot patterns that are overlapped with the base with respect to the imaginary line M' of the dot pattern that becomes the base are changed.

6. A method of 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 irradiating light that passes through the negative to the photosensitive resin on which the negative is placed and curing the photosensitive resin at a position where the light passes through the negative, wherein the printing plate has a printing protrusion with a plurality of protrusions formed on a top surface, in the negative production step, a shape (E) in which two or more dot patterns are overlapped with each other in the same plane in a manner that positions of the dot patterns are overlapped with each other at least one of dots possessed by each dot pattern and at least one of dots possessed by a different dot pattern is formed, 0°＜α1＜90°···(1) in the photosensitive resin curing step, the light passes through a shape (E) portion formed on the negative, the photosensitive resin irradiated with the light is cured, and the protrusions are formed using the cured portion.

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

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