CN110757945B - Printing screen and printing device - Google Patents
Printing screen and printing device Download PDFInfo
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- CN110757945B CN110757945B CN201911212996.1A CN201911212996A CN110757945B CN 110757945 B CN110757945 B CN 110757945B CN 201911212996 A CN201911212996 A CN 201911212996A CN 110757945 B CN110757945 B CN 110757945B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/34—Screens, Frames; Holders therefor
- B41F15/36—Screens, Frames; Holders therefor flat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F15/00—Screen printers
- B41F15/14—Details
- B41F15/44—Squeegees or doctors
Abstract
The invention relates to a printing silk screen and a printing device, wherein the printing silk screen comprises a screen frame and a screen surface formed by interweaving a plurality of silk screens, the screen surface is positioned in the screen frame, and the end parts of the silk screens are connected with the inner side of the screen frame; the screen surface is provided with a plurality of through holes, each through hole protrudes out of the corresponding preset vertical line along the direction opposite to the silk screen printing direction, the middle part of the screen surface is provided with a central transverse line parallel to the silk screen printing direction, and each through hole protrudes out of the corresponding preset transverse line along the direction towards the central transverse line. The position of each through hole protrudes along the direction opposite to the silk-screen direction, so that the offset of the through holes along the direction same as the silk-screen direction is reduced during silk-screen printing, the position of each through hole protrudes towards the direction of the central transverse line, the offset of the through holes towards the direction far away from the central transverse line is reduced during silk-screen printing, the offset of the positions of finally formed silk-screen patterns and the position of expected patterns is reduced, and the matching precision of the positions of the formed silk-screen patterns is improved.
Description
Technical Field
The invention relates to the technical field of display screens, in particular to a printing silk screen and a printing device.
Background
With the rapid development of display screen technology, various electronic instruments with display screens increase the display area of the display screen on the premise of gradually pursuing performance, so that the display content is increased. For a display screen having an AMOLED (Active-matrix organic light-emitting diode, Active matrix organic light-emitting diode, or Active matrix organic light-emitting diode), a display area having different functions needs to be distinguished by a background color on the display screen, that is, a specified background pattern is made on the display screen.
The traditional pattern making mode is to coat pattern raw materials on a display screen through a silk screen, and the size of the display screen tends to be large, so that the size of the used silk screen is increased. Because the via holes used for forming the patterns on the traditional silk screen are distributed in a matrix mode, when a large-size silk screen is used, the silk screen is in contact with the scraper to generate a force action, so that the silk screen generates deformation in the same direction as the pushing force of the scraper under the pushing force action of the scraper, the designed patterns of the silk screen deviate towards the printing direction to cause the deviation of the patterns in the parallel printing direction, furthermore, the silk screen has a screen distance with the rear cover glass, when the scraper presses downwards for printing, the silk screen generates outward pulling force under the tension action of the silk screen, the silk screen patterns expand outwards from the middle to cause the deviation of the patterns in the vertical printing direction, so that the positions of the patterns finally formed on the display screen deviate from the expected positions, the matching precision of the positions of the finally formed silk screen patterns is reduced, and the yield of the display screen product is reduced.
Disclosure of Invention
In view of this, it is necessary to provide a printing screen and a printing apparatus that improve the accuracy of matching the positions of the screen-printed patterns.
A printing screen, comprising: the net surface is formed by interweaving a net frame and a plurality of net wires, the net surface is positioned in the net frame, and the end parts of the net wires are connected with the inner side of the net frame; the wire side has a plurality of via holes, each the via hole is along the direction protrusion that carries on the back with the silk screen printing direction in the predetermined vertical line that corresponds, the middle part of wire side has the central horizontal line parallel with the silk screen printing direction, each the via hole is along the orientation the direction protrusion of central horizontal line is in the predetermined horizontal line that corresponds, wherein, predetermine the vertical line that each via hole corresponds on the vertical line is the anticipated silk screen printing pattern, predetermine vertical line and silk screen printing direction perpendicular, predetermine the horizontal line that each via hole corresponds on the horizontal line is the anticipated silk screen printing pattern, predetermine horizontal line and silk screen printing direction parallel, predetermine vertical line and silk screen printing direction perpendicular.
In one embodiment, in the opposite direction of the screen printing direction, the distance that the via hole close to the central transverse line protrudes from the corresponding preset vertical line is greater than the distance that the via hole far from the central transverse line protrudes from the corresponding preset vertical line.
In one embodiment, the distance from the via hole close to the central transverse line to the via hole far away from the central transverse line to protrude out of the corresponding preset vertical line gradually decreases.
In one embodiment, the difference of the distances between any two adjacent via holes protruding from the corresponding preset vertical line in the direction perpendicular to the screen printing direction is equal.
In one embodiment, the difference of the distances between two adjacent via holes which are vertical to the screen printing direction and protrude from the corresponding preset vertical line is 3-7 μm.
In one embodiment, in a direction perpendicular to the screen printing direction and away from the central transverse line, a distance that the via hole close to the central transverse line protrudes out of the corresponding preset transverse line is smaller than a distance that the via hole away from the central transverse line protrudes out of the corresponding preset transverse line.
In one embodiment, the distance from the via hole close to the central transverse line to the via hole far away from the central transverse line to protrude out of the corresponding preset transverse line gradually increases.
In one embodiment, the difference of the distances between any two adjacent via holes protruding from the corresponding preset transverse line in the direction perpendicular to the screen printing direction is equal.
In one embodiment, the difference of the distances between two adjacent via holes which are vertical to the silk-screen printing direction and protrude from the corresponding preset transverse line is 5-10 μm.
A printing unit comprising an operating platform, a squeegee blade and a printing screen as described in any of the above embodiments, wherein the printing screen is disposed on the operating platform, the squeegee blade is movable on a side of the web facing away from the operating platform, and the squeegee blade is configured to pass a paste on the web through the via holes.
In the above-mentioned printing silk screen and printing device, the position of each via hole is along the direction that is carried on the back with the silk screen printing direction, makes the offset of via hole along the same direction with the silk screen printing direction reduce when the silk screen printing, and the position of each via hole is towards central horizontal line direction protrusion, makes the offset that the via hole orientation kept away from central horizontal line reduce when the silk screen printing, thereby makes the position offset of the silk screen pattern that finally forms and the position offset of anticipating the pattern reduce, and then makes the matching precision of the position of the silk screen pattern that forms improve.
Drawings
Figure 1 is a schematic view of the construction of a printing screen according to one embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The present invention relates to a printing screen. In one embodiment, the printing screen comprises: the net surface is formed by interweaving a net frame and a plurality of net wires, the net surface is positioned in the net frame, and the end parts of the net wires are connected with the inner side of the net frame; the wire side has a plurality of via holes, each the via hole is along the direction protrusion that carries on the back with the silk screen printing direction in the predetermined vertical line that corresponds, the middle part of wire side has the central horizontal line parallel with the silk screen printing direction, each the via hole is along the orientation the direction protrusion of central horizontal line is in the predetermined horizontal line that corresponds, wherein, predetermine the vertical line that each via hole corresponds on the vertical line is the anticipated silk screen printing pattern, predetermine vertical line and silk screen printing direction perpendicular, predetermine the horizontal line that each via hole corresponds on the horizontal line is the anticipated silk screen printing pattern, predetermine horizontal line and silk screen printing direction parallel, predetermine vertical line and silk screen printing direction perpendicular. The position of each through hole protrudes along the direction opposite to the silk-screen direction, so that the offset of the through holes along the direction same as the silk-screen direction is reduced during silk-screen printing, the position of each through hole protrudes towards the direction of the central transverse line, the offset of the through holes towards the direction far away from the central transverse line is reduced during silk-screen printing, the offset of the positions of finally formed silk-screen patterns and the position of expected patterns is reduced, and the matching precision of the positions of the formed silk-screen patterns is improved.
Please refer to fig. 1, which is a schematic structural diagram of a printing screen according to an embodiment of the present invention.
A printing screen 10, comprising: the net surface 200 is formed by interweaving a net frame 100 and a plurality of net wires, the net surface 200 is positioned inside the net frame 100, and the end parts of the net wires are connected with the inner side of the net frame 100; the wire side 200 has a plurality of via holes 210, each via hole 210 is along the direction protrusion that carries on the back with silk screen printing direction D1 in the predetermined vertical line L1 that corresponds, the middle part of wire side 200 has the central horizontal line L3 parallel with silk screen printing direction D1, each via hole 210 is along the orientation central horizontal line L3's direction protrusion in the predetermined horizontal line L2 that corresponds, wherein, predetermine vertical line L1 and be the vertical line that each via hole 210 corresponds on the anticipated silk screen printing pattern, predetermine vertical line L1 and silk screen printing direction D1 perpendicularly, predetermine horizontal line L2 and be the horizontal line that each via hole 210 corresponds on the anticipated silk screen printing pattern, predetermine horizontal line L2 and silk screen printing direction D1 parallel, predetermine vertical line L1 and silk screen printing direction D1 perpendicularly.
In the present embodiment, the position of each via hole 210 protrudes in a direction opposite to the screen printing direction D1, so that the offset of the via hole 210 in the same direction as the screen printing direction D1 is reduced during screen printing, and the position of each via hole 210 protrudes toward the central transverse line L3, so that the offset of the via hole 210 away from the central transverse line L3 is reduced during screen printing, so that the position offset of the finally formed screen printed pattern from the expected pattern is reduced, and the matching accuracy of the positions of the formed screen printed patterns is improved.
In one embodiment, referring to fig. 1, in a direction opposite to the screen printing direction D1, a distance that the via hole 210 close to the central horizontal line L3 protrudes beyond the corresponding preset vertical line L1 is greater than a distance that the via hole 210 far from the central horizontal line L3 protrudes beyond the corresponding preset vertical line L1. In this embodiment, the central horizontal line L3 is a horizontal line parallel to the screen printing direction D1 on the central point of the screen surface 200, and the central horizontal line L3 is also parallel to the rows of the via holes 210 distributed on the screen surface 200, that is, the rows of the via holes 210 on the mesh holes are parallel to the screen printing direction D1. Since the position of the silk-screen pattern finally formed by silk-screen corresponds to the position of the expected silk-screen pattern, when the scraper moves along the silk-screen direction D1 on the screen surface 200, the scraper moves to generate an acting force on the screen surface 200 which is the same as the silk-screen direction D1, in order to keep balance, the screen surface 200 generates a deformation elastic force opposite to the silk-screen direction D1 under the self elastic deformation, and, since the screen is formed by interweaving the screen wires, when the scraper moves, the screen wires perpendicular to the silk-screen direction D1 elastically deform, wherein, for the screen wires perpendicular to the silk-screen direction D1, the amount of the elastic deformation of the screen wires close to the screen frame 100 is smaller, so that the position of the through holes 210 far away from the central transverse line L3 is smaller, and the amount of the elastic deformation of the screen wires at the middle position is larger, so that the position of the through holes 210 close to the central transverse line L3 is larger, so that the offset amount of the via holes 210 in the middle of the mesh towards the same direction as the silk-screen direction D1 is larger than the offset amount of the via holes 210 at the end of the mesh towards the same direction as the silk-screen direction D1. In order to compensate the offset of the via holes 210 in the screen printing direction D1, that is, in the screen printing direction D1, the matching accuracy of the position of the finally formed screen printing pattern and the position of the expected screen printing pattern is improved, the distance of the via holes 210 protruding in the direction opposite to the screen printing direction D1 is increased, wherein, for the via holes 210 close to the central transverse line L3, the distance of the preset vertical line L1 protruding by itself is larger, that is, the distance of the via holes 210 close to the central transverse line L3 protruding in the direction opposite to the screen printing direction D1 is larger, that is, the offset compensation amount of the via holes 210 located in the middle of the screen is larger; for the via holes 210 far away from the central transverse line L3, the distance of the preset vertical line L1 corresponding to the protruding via holes is smaller, that is, the distance of the via holes 210 near the central transverse line L3 protruding in the direction opposite to the screen printing direction D1 is smaller, that is, the offset compensation amount of the via holes 210 at the end of the screen is smaller. In this way, the adjustment of the offset compensation amount of the via holes 210 is performed, that is, the via holes 210 are offset in the direction opposite to the screen printing direction D1, and the offset compensation amount of the via holes 210 close to the central transverse line L3 is greater than the offset compensation amount of the via holes 210 far from the central transverse line L3, so that the offset amount of the via holes 210 corresponding to the desired pattern in the same direction as the screen printing direction D1 is reduced during the screen printing process, and thus the offset amount of the position of the formed screen printing pattern and the position of the desired pattern in the same direction as the screen printing direction D1 is reduced, and further the matching accuracy of the position of the formed screen printing pattern and the position of the desired pattern is improved.
In one embodiment, referring to fig. 1, the distance from the via 210 close to the central horizontal line L3 to the via 210 far from the central horizontal line L3 protruding from the corresponding predetermined vertical line L1 gradually decreases. In this embodiment, the silk-screen pattern finally formed by the printing paste passing through the plurality of via holes 210 is regularly and matrix-distributed, since the position of the silk-screen pattern finally formed by silk-screen corresponds to the position of the expected silk-screen pattern, when the scraper moves on the screen 200 along the silk-screen direction D1, the scraper moves to apply the same acting force to the screen 200 as the silk-screen direction D1, the screen 200 generates a deformation elastic force opposite to the silk-screen direction D1 under its own elastic deformation for keeping balance, and since the screen is formed by interlacing the screen, when the scraper moves, the screen perpendicular to the silk-screen direction D1 is elastically deformed, wherein the amount of the elastic deformation occurring at the end position of the screen is the minimum, that is, the amount of the elastic deformation occurring at the position of the screen close to the frame 100 is the minimum, and the amount of the elastic deformation occurring at the middle position of the screen is the maximum, that is, the amount of elastic deformation of the mesh at a position distant from the frame 100 is greater than the amount of elastic deformation occurring at the end position of the mesh, and the amount of elastic deformation gradually increases from the end position of the mesh to the central position of the mesh, so that the amount of positional deviation of the via holes 210 from the end position of the mesh to the central position of the mesh gradually increases toward the same direction as the screen printing direction D1. In order to compensate the offset of the via holes 210 in the screen printing direction D1, the positions of the via holes 210 at different positions are offset to different degrees according to the offset of the via holes 210 in the direction parallel to the screen printing direction D1, and the positions of the via holes 210 are offset to the direction opposite to the screen printing direction D1, wherein, for the screen wires in the direction perpendicular to the screen printing direction D1, the offset compensation amount is the largest for the via holes 210 near the central transverse line L3 in the direction opposite to the screen printing direction D1, and the offset compensation amount is the smallest for the via holes 210 far from the central transverse line L3, that is, in the direction opposite to the screen printing direction D1, the offset compensation amount is the largest for the via holes 210 in the middle of the screen wires, the offset compensation amount is the smallest for the via holes 210 at the ends of the screen wires, and the offset compensation amount of the via holes 210 in the positions from the middle of the screen wires to the ends of the screen wires is gradually reduced, so that the offset compensation amount of the via hole 210 from the position close to the transverse center line L3 to the position far from the transverse center line L3 is gradually reduced, and thus the offset compensation amount of the via hole 210 from the position close to the transverse center line L3 to the position far from the transverse center line L3 is gradually reduced toward the opposite direction of the screen printing direction D1. In this way, the adjustment of the offset compensation amount for the via holes 210 reduces the offset amount of each via hole 210 between the via holes 210 corresponding to the expected pattern in the same direction as the screen printing direction D1 during the screen printing process, so that the offset amount of the position of the formed screen printing pattern from the expected pattern in the same direction as the screen printing direction D1 is reduced, and the matching accuracy of the position of the formed screen printing pattern and the position of the expected pattern is improved. In one embodiment, the distance from the via hole 210 close to the central transverse line L3 to the via hole 210 far from the central transverse line L3 to protrude out of the corresponding preset vertical line L1 is correspondingly adjusted according to actual conditions, for example, the distance from the via hole 210 close to the central transverse line L3 to the via hole 210 far from the central transverse line L3 to protrude out of the corresponding preset vertical line L1 is arranged in an equal difference manner; for another example, the distances from the via holes 210 close to the central horizontal line L3 to the via holes 210 far from the central horizontal line L3 protruding from the corresponding predetermined vertical lines L1 are arranged in equal proportion. The distances in the above embodiments are arranged in any manner, and the distances from the via hole 210 close to the central horizontal line L3 to the via hole 210 far from the central horizontal line L3 protruding from the corresponding predetermined vertical line L1 are gradually decreased.
In one embodiment, referring to fig. 1, the difference between the distances that any two adjacent via holes 210 in the direction perpendicular to the screen printing direction D1 protrude from the corresponding preset vertical line L1 is equal. In this embodiment, the silk-screen pattern finally formed by the printing paste passing through the plurality of via holes 210 is regularly and matrix-distributed, since the position of the silk-screen pattern finally formed by silk-screen corresponds to the position of the expected silk-screen pattern, when the scraper moves on the screen 200 along the silk-screen direction D1, the scraper moves to apply the same acting force to the screen 200 as the silk-screen direction D1, the screen 200 generates a deformation elastic force opposite to the silk-screen direction D1 under its own elastic deformation for keeping balance, and since the screen is formed by interlacing the screen, when the scraper moves, the screen perpendicular to the silk-screen direction D1 is elastically deformed, wherein the amount of the elastic deformation occurring at the end position of the screen is the minimum, that is, the amount of the elastic deformation occurring at the position of the screen close to the frame 100 is the minimum, and the amount of the elastic deformation occurring at the middle position of the screen is the maximum, that is, the amount of elastic deformation of the mesh at a position far from the frame 100 is greater than the amount of elastic deformation occurring at the end positions of the mesh, and the amount of elastic deformation gradually increases and increases with equal difference from the end positions of the mesh to the central position of the mesh, so that the amount of positional deviation of the via holes 210 from the end positions of the mesh to the central position of the mesh increases with equal difference toward the same direction as the screen printing direction D1. In order to compensate the offset of the via holes 210 in the screen printing direction D1, the positions of the via holes 210 at different positions are offset to different degrees according to the position offset of the via holes 210 in the direction parallel to the screen printing direction D1, and the positions of the via holes 210 are offset to the direction opposite to the screen printing direction D1, wherein for the screen printing in the direction perpendicular to the screen printing direction D1, the offset compensation amount is the largest for the via holes 210 close to the central transverse line L3 in the direction opposite to the screen printing direction D1, and the offset compensation amount is the smallest for the via holes 210 far from the central transverse line L3, that is, in the direction opposite to the screen printing direction D1, the offset compensation amount is the largest for the via holes 210 in the middle of the screen printing, the offset compensation amount is the smallest for the via holes 210 at the ends of the screen printing, and the offset compensation amounts of the via holes 210 from the position in the middle of the screen printing to the positions of the ends of the screen printing gradually decrease and become equal offset amounts The difference is reduced, so that the difference of the offset compensation amounts of the via holes 210 from the position close to the transverse center line L3 to the position far from the transverse center line L3 is decreased, so that the difference of the offset compensation amounts of the via holes 210 from the position close to the transverse center line L3 to the position far from the transverse center line L3 towards the direction opposite to the screen printing direction D1 is decreased, and the difference of the offset compensation amounts of any two adjacent via holes 210 from the position close to the transverse center line L3 to the position far from the transverse center line L3 is equal. In this way, the adjustment of the offset compensation amount for the via holes 210 reduces the offset amount of each via hole 210 between the via holes 210 corresponding to the expected pattern in the same direction as the screen printing direction D1 during the screen printing process, so that the offset amount of the position of the formed screen printing pattern from the expected pattern in the same direction as the screen printing direction D1 is reduced, and the matching accuracy of the position of the formed screen printing pattern and the position of the expected pattern is improved.
In one embodiment, referring to fig. 1, a difference between distances of the two adjacent via holes 210 protruding from the corresponding predetermined vertical line L1 in the direction perpendicular to the screen printing direction D1 is 3 to 7 μm. In this embodiment, in the direction perpendicular to the screen printing direction D1, the difference between the offset compensation amounts of the adjacent two via holes 210 in the direction opposite to the screen printing direction D1 is a fixed value, and the offset compensation amounts of the via holes 210 from the direction close to the central transverse line L3 to the direction far from the central transverse line L3 in the direction opposite to the screen printing direction D1 are decreased in an equal difference manner, so that the offset of each via hole 210 in the direction opposite to the screen printing direction D1 during the screen printing process is decreased, so that the screen printing pattern finally formed by each via hole 210 is aligned with the expected screen printing pattern, and the matching accuracy between the position of the formed screen printing pattern and the position of the expected pattern is improved. In other embodiments, the difference between the distances from the adjacent two via holes perpendicular to the screen printing direction to the corresponding preset vertical lines is 5 μm, that is, the difference between the offset compensation amounts of the adjacent two via holes perpendicular to the screen printing direction towards the direction opposite to the screen printing direction is 5 μm, the screen surface has a screen surface formed by 9 rows of via holes, for example, the offset compensation amounts of the via holes in rows 1 and 9 towards the direction opposite to the screen printing direction are 0, the offset compensation amounts of the via holes in rows 2 and 8 towards the direction opposite to the screen printing direction are 5 μm, the offset compensation amounts of the via holes in rows 3 and 7 towards the direction opposite to the screen printing direction are 10 μm, the offset compensation amounts of the via holes in rows 4 and 6 towards the direction opposite to the screen printing direction are 15 μm, and the offset compensation amount of the via holes in row 5 towards the direction opposite to the screen printing direction is 20 μm, the through holes on the screen surface form a U-shaped structure, and the opening direction of the U-shaped structure is the same as the screen printing direction. According to the comparison of the finally formed silk-screen pattern and the expected silk-screen pattern experimental data, the offset of the through holes at the positions corresponding to the silk-screen pattern finally formed by the traditional silk screen and the expected silk-screen pattern in the silk-screen direction is-0.02 mu m, while the offset of the through holes at the positions corresponding to the silk-screen pattern finally formed by the silk screen and the expected silk-screen pattern in the silk-screen direction is-0.01 mu m, so that in the direction parallel to the silk-screen direction, the matching precision of the silk-screen pattern formed by the silk screen is higher than that of the silk-screen pattern formed by the traditional silk screen, and the matching precision between the silk-screen pattern finally formed by the silk screen and the expected silk-screen pattern is improved.
In one embodiment, referring to fig. 1, in a direction perpendicular to the screen printing direction D1 and away from the central transverse line L3, a distance that the via hole 210 close to the central transverse line L3 protrudes beyond the corresponding preset transverse line L2 is smaller than a distance that the via hole 210 away from the central transverse line L3 protrudes beyond the corresponding preset transverse line L2. In this embodiment, the central horizontal line L3 is a horizontal line parallel to the screen printing direction D1 on the central point of the screen surface 200, and the central horizontal line L3 is also parallel to the rows of the via holes 210 distributed on the screen surface 200, that is, the rows of the via holes 210 on the mesh holes are parallel to the screen printing direction D1. Since the position of the silk-screen pattern finally formed by silk-screen printing corresponds to the position of the expected silk-screen pattern, when the scraper moves on the screen surface 200 along the silk-screen direction D1, due to the distance between the screen and the platform, the screen surface 200 deforms, and the screen surface 200 generates a tension force perpendicular to the silk-screen direction D1 and far from the central transverse line L3 under the elastic deformation of the screen surface 200 itself, so that the via holes 210 on both sides of the central transverse line L3 deflect towards the direction far from the central transverse line L3, wherein the amount of the elastic deformation near the central transverse line L3 is smaller, the position of the via hole 210 near the central transverse line L3 is slightly deflected, the amount of the elastic deformation far from the central transverse line L3 is larger, the position of the via hole 210 far from the central transverse line L3 is greatly deflected, and the amount of the offset of the via hole 210 near the central transverse line L3 in the direction perpendicular to the silk-screen direction D1 and far from the central transverse line L3 is smaller than the amount of the elastic deformation in the central transverse line L3 The vias 210 of the cross-center line L3 are offset perpendicular to the screen printing direction D1 and away from the cross-center line L3.
In order to compensate the offset of the via holes 210 in the direction perpendicular to the screen printing direction D1 and away from the transverse center line L3, namely, in the upward direction perpendicular to the screen printing direction D1 and away from the transverse center line L3, the matching accuracy of the position of the finally formed screen printing pattern and the position of the expected screen printing pattern is improved, the distance of the via holes 210 protruding in the direction perpendicular to the screen printing direction D1 and away from the transverse center line L3 is increased, wherein, for the via holes 210 close to the transverse center line L3, the increasing distance of the preset transverse line L2 protruding by itself is smaller, that is, the distance of the via holes 210 close to the transverse center line L3 protruding in the direction perpendicular to the screen printing direction D1 and away from the transverse center line L3 is smaller, that is, that the offset compensation amount of the via holes 210 close to the transverse center line L3 is smaller; for the via holes 210 far from the central transverse line L3, the increasing distance of the preset transverse line L2 corresponding to the protruding via holes is relatively large, that is, the distance of the via holes 210 near the central transverse line L3 protruding in the direction perpendicular to the screen printing direction D1 and far from the central transverse line L3 is relatively large, that is, the offset compensation amount of the via holes 210 far from the central transverse line L3 is relatively large. In this way, the adjustment of the offset compensation amount of the via holes 210 is performed such that the via holes 210 are offset in the direction of the central transverse line L3 in the direction perpendicular to the screen printing direction D1 and away from the central transverse line L3, and the offset compensation amount of the via hole 210 close to the central transverse line L3 is smaller than that of the via hole 210 far from the central transverse line L3, so that the amount of positional offset between the vias 210 corresponding to the desired pattern in a direction perpendicular to the screen printing direction D1 and away from the central transverse line L3 during screen printing is reduced, so that in a direction perpendicular to the screen printing direction D1 and away from the central transverse line L3, the position of the screen printed pattern formed is offset from the position of the intended pattern by a reduced amount, and further the matching precision of the positions of the formed silk-screen patterns and the positions of expected patterns is improved.
In one embodiment, referring to fig. 1, the distance from the via 210 close to the central horizontal line L3 to the via 210 far from the central horizontal line L3 protruding from the corresponding predetermined horizontal line L2 gradually increases. In this embodiment, the central horizontal line L3 is a horizontal line parallel to the screen printing direction D1 on the central point of the screen surface 200, and the central horizontal line L3 is also parallel to the rows of the via holes 210 distributed on the screen surface 200, that is, the rows of the via holes 210 on the mesh holes are parallel to the screen printing direction D1. Since the position of the silk-screen pattern finally formed by silk-screen printing corresponds to the position of the expected silk-screen pattern, when the scraper moves on the screen surface 200 along the silk-screen direction D1, due to the distance between the screen and the platform, the screen surface 200 deforms, and the screen surface 200 generates a tension force perpendicular to the silk-screen direction D1 and far from the central transverse line L3 under the elastic deformation of the screen surface 200 itself, so that the via holes 210 on both sides of the central transverse line L3 deflect towards the direction far from the central transverse line L3, wherein the amount of the elastic deformation near the central transverse line L3 is smaller, the position of the via hole 210 near the central transverse line L3 is slightly deflected, the amount of the elastic deformation far from the central transverse line L3 is larger, the position of the via hole 210 far from the central transverse line L3 is greatly deflected, and the amount of the offset of the via hole 210 near the central transverse line L3 in the direction perpendicular to the silk-screen direction D1 and far from the central transverse line L3 is smaller than the amount of the elastic deformation in the central transverse line L3 The vias 210 of the cross-center line L3 are offset perpendicular to the screen printing direction D1 and away from the cross-center line L3. In one embodiment, the distance from the via 210 close to the central transverse line L3 to the via 210 far from the central transverse line L3 to protrude out of the corresponding preset transverse line L2 is correspondingly adjusted according to actual conditions, for example, the distance from the via 210 close to the central transverse line L3 to the via 210 far from the central transverse line L3 to protrude out of the corresponding preset transverse line L2 is arranged in an equal difference manner; for another example, the distances from the vias 210 close to the central transverse line L3 to the vias 210 far from the central transverse line L3 protruding from the corresponding predetermined transverse line L2 are arranged in an equal ratio. The distances in the above embodiments are arranged in any manner, and the distances from the via hole 210 close to the central transverse line L3 to the via hole 210 far from the central transverse line L3 protruding from the corresponding predetermined transverse line L2 may be gradually increased.
In order to compensate the offset of the via holes 210 in the direction perpendicular to the screen printing direction D1 and away from the transverse center line L3, the positions of the via holes 210 at different positions are compensated for by different degrees of positional offset according to the positional offset of the via holes 210 in the direction perpendicular to the screen printing direction D1 and away from the transverse center line L3, and the positions of the via holes 210 are offset toward the direction perpendicular to the screen printing direction D1 and close to the transverse center line L3, wherein the amount of positional offset compensation for the via holes 210 close to the transverse center line L3 is the smallest and the amount of positional offset compensation for the via holes 210 away from the transverse center line L3 is the largest in the direction perpendicular to the screen printing direction D1 and close to the transverse center line L3, and for the mesh wires parallel to the screen printing direction D1, the mesh wires close to the transverse center line L3 are shifted to the mesh wires on the mesh wires away from the transverse center line L3, the offset compensation amount of the via hole is gradually increased towards the central transverse line L3, so that the offset compensation amount of the via hole 210 from the position close to the central transverse line L3 to the position far away from the central transverse line L3 is gradually increased towards the central transverse line L3 in the direction perpendicular to the silk-screen direction D1. In this way, the adjustment of the offset compensation amount for the via holes 210 reduces the offset amount between the via holes 210 corresponding to the expected pattern in the direction perpendicular to the screen printing direction D1 of each via hole 210 during the screen printing process, so that the offset amount between the position of the formed screen printing pattern and the expected pattern in the direction perpendicular to the screen printing direction D1 is reduced, and the matching accuracy between the position of the formed screen printing pattern and the position of the expected pattern is improved.
In one embodiment, referring to fig. 1, the difference between the distances that any two adjacent via holes 210 in the direction perpendicular to the screen printing direction D1 protrude from the corresponding predetermined transverse line L2 is equal. In this embodiment, the central horizontal line L3 is a horizontal line parallel to the screen printing direction D1 on the central point of the screen surface 200, and the central horizontal line L3 is also parallel to the rows of the via holes 210 distributed on the screen surface 200, that is, the rows of the via holes 210 on the mesh holes are parallel to the screen printing direction D1. Since the position of the silk-screen pattern finally formed by silk-screen printing corresponds to the position of the expected silk-screen pattern, when the scraper moves on the screen surface 200 along the silk-screen direction D1, due to the distance between the screen and the platform, the screen surface 200 deforms, and the screen surface 200 generates a tension force perpendicular to the silk-screen direction D1 and far from the central transverse line L3 under the elastic deformation of the screen surface 200 itself, so that the via holes 210 on both sides of the central transverse line L3 deflect towards the direction far from the central transverse line L3, wherein the amount of the elastic deformation near the central transverse line L3 is smaller, the position of the via hole 210 near the central transverse line L3 is slightly deflected, the amount of the elastic deformation far from the central transverse line L3 is larger, the position of the via hole 210 far from the central transverse line L3 is greatly deflected, and the amount of the offset of the via hole 210 near the central transverse line L3 in the direction perpendicular to the silk-screen direction D1 and far from the central transverse line L3 is smaller than the amount of the elastic deformation in the central transverse line L3 The vias 210 of the cross-center line L3 are offset perpendicular to the screen printing direction D1 and away from the cross-center line L3.
In order to compensate the offset of the via holes 210 in the direction perpendicular to the screen printing direction D1, the positions of the via holes 210 at different positions are offset to different degrees according to the offset of the via holes 210 in the direction perpendicular to the screen printing direction D1, and the positions of the via holes 210 are offset to a direction perpendicular to the screen printing direction D1 and close to the central transverse line L3, wherein for the screen wires in the direction parallel to the screen printing direction D1, the offset compensation amount of the via holes 210 close to the central transverse line L3 is the smallest in the direction perpendicular to the screen printing direction D1 and close to the central transverse line L3, and the offset compensation amount of the via holes 210 far from the central transverse line L3 is the largest in the direction perpendicular to the screen printing direction D1 and close to the central transverse line L3, and the offset compensation amount of the via holes 210 close to the central transverse line L3 to the central transverse line L3 is the smallest in the direction, the offset compensation amount of the via hole 210 far from the transverse center line L3 is the largest toward the transverse center line L3, and the offset compensation amount of the via hole 210 from the position close to the transverse center line L3 to the position far from the transverse center line L3 gradually increases and is in equal difference, so that the offset compensation amount of the via hole 210 from the position close to the transverse center line L3 to the position far from the transverse center line L3 is gradually increased in equal difference, so that the offset compensation amount of the via hole 210 from the position close to the transverse center line L3 to the position far from the transverse center line L3 is gradually increased in equal difference from the transverse center line L3, and the difference between the offset compensation amounts of any two adjacent via holes 210 in the direction from the position close to the transverse center line L3 to the position far from the transverse center line L3 is equal. In this way, the adjustment of the offset compensation amount of the via holes 210 is performed in the direction perpendicular to the screen printing direction D1 and close to the central transverse line L3, so that the offset between each via hole 210 and the via hole 210 corresponding to the desired pattern is reduced during the screen printing process, the offset between the position of the formed screen printing pattern and the desired pattern is reduced, and the matching accuracy between the position of the formed screen printing pattern and the position of the desired pattern is improved. In other embodiments, when there is a via hole on the central transverse line, the via hole on the central transverse line is not shifted in the direction perpendicular to the screen printing direction D1.
In one embodiment, referring to fig. 1, a difference between distances of two adjacent via holes 210 protruding from a corresponding predetermined transverse line L2 in a direction perpendicular to a screen printing direction D1 is 5 to 10 μm. In this embodiment, in a direction perpendicular to the screen printing direction D1, a difference between the offset compensation amounts of the adjacent two via holes 210 in a direction approaching the central transverse line L3 is a fixed value, and the offset compensation amounts of the via holes 210 from the direction approaching the central transverse line L3 to the direction away from the central transverse line L3 toward the central transverse line L3 are increased in an equal difference manner, so that the offset of each via hole 210 in a direction approaching the central transverse line L3 during the screen printing process is increased, and the final screen printing pattern formed by each via hole 210 is aligned with the desired screen printing pattern, thereby improving the matching accuracy between the position of the formed screen printing pattern and the position of the desired pattern. In other embodiments, the difference of the distances between two adjacent via holes in the direction perpendicular to the screen printing direction and protruding from the corresponding preset transverse line is 7 μm, namely, the difference of the offset compensation quantity of the positions of two adjacent via holes which are vertical to the silk-screen printing direction and face the center transverse direction is 7 μm, the mesh surface is provided with a mesh surface formed by 9 rows of via holes, for example, the offset compensation amount of the via holes in the 1 st and 9 th rows toward the central transverse line is 28 μm, the offset compensation amount of the via holes in the 2 nd and 8 th rows toward the central transverse line is 21 μm, the offset compensation amount of the via holes in the 3 rd and 7 th rows toward the central transverse line is 14 μm, the offset compensation amount of the via holes in the 4 th and 6 th rows toward the central transverse line is 7 μm, and the offset compensation amount of the via holes in the 5 th row toward the direction opposite to the screen printing direction is 0. According to the comparison of the finally formed silk-screen pattern and the expected silk-screen pattern experimental data, the offset of the through holes at the corresponding positions of the silk-screen pattern finally formed by the traditional silk screen and the expected silk-screen pattern in the silk-screen direction is-0.03-0.04 mu m, while the offset of the through holes at the corresponding positions of the silk-screen pattern finally formed by the silk screen and the expected silk-screen pattern in the central transverse line direction is-0.008 mu m, so that in the direction vertical to the silk-screen direction, the matching precision of the silk-screen pattern formed by the silk screen is higher than that of the silk-screen pattern formed by the traditional silk screen, and the matching precision between the silk-screen pattern finally formed by the silk screen and the expected silk-screen pattern is improved.
In one embodiment, referring to fig. 1, the pitches between two adjacent vias 210 in the direction parallel to the printing direction are the same. In the present embodiment, the mesh surface 200 is composed of a plurality of rows of vias 210, and the number of vias 210 in each row is plural. Since the through holes 210 corresponding to the expected silk-screen pattern are distributed in a matrix, the silk-screen direction D1 is parallel to the rows of the through holes 210 on the screen surface 200, that is, the horizontal line formed by the through holes 210 on each row on the screen surface 200 is parallel to the silk-screen direction D1, and the screen surface 200 is a complete screen, so that the through holes 210 on each row on the screen surface 200 are integrally offset, and the distance between two adjacent through holes 210 in the direction parallel to the printing direction is the same, so that the distance between two adjacent through holes 210 in the direction parallel to the silk-screen direction D1 is kept constant, thereby reducing the influence of the through holes 210 in the direction parallel to the printing direction on the matching accuracy between the finally formed silk-screen pattern and the expected silk-screen pattern.
In one embodiment, referring to fig. 1, the printing screen comprises: the net surface 200 is formed by interweaving a net frame 100 and a plurality of net wires, the net surface 200 is positioned inside the net frame 100, and the end parts of the net wires are connected with the inner side of the net frame 100; the screen surface 200 is provided with a plurality of via holes 210, a plurality of rows of via hole units are formed in the direction perpendicular to the screen printing direction D1, each row of via hole unit comprises a plurality of via holes 210, the distance between every two adjacent rows of via hole units is equal, each row of via hole unit has a U-shaped structure, and the opening direction of each via hole unit is the same as the screen printing direction D1; the distance between two adjacent via holes 210 in each row of the via hole units is equal, and the distance between two adjacent via holes 210 in each row of the via hole units is smaller than a preset distance, wherein the preset distance is the distance between two adjacent patterns in the same row of the expected silk-screen patterns. Thus, the via holes 210 in the direction parallel to the screen printing direction D1 are offset in the opposite direction to the screen printing direction D1, and the via holes 210 in the direction perpendicular to the screen printing direction D1 are offset in the middle of the frame 100, for example, the via holes 210 on the conventional screen are distributed in a matrix, when the screen printing direction D1 is shifted laterally from right to left, and the horizontal line at the middle of the screen is taken as a reference, then the via holes 210 on the screen of the present invention, the via holes 210 above the horizontal line at the middle of the screen are offset toward the lower right with respect to the corresponding via holes 210 on the conventional screen, the via holes 210 below the horizontal line at the middle of the screen are offset toward the upper right with respect to the corresponding via holes 210 on the conventional screen, and the via holes 210 on the horizontal line at the middle of the screen are offset toward the right with respect to the corresponding via holes 210 on the conventional screen; for another example, the via holes on the conventional screen are distributed in a matrix, and when the screen printing direction is a horizontal movement from left to right, taking the horizontal line at the middle position of the screen as a reference, the via holes on the screen of the present invention are offset towards the lower left with respect to the via holes corresponding to the conventional screen, the via holes below the horizontal line at the middle position of the screen are offset towards the upper left with respect to the via holes corresponding to the conventional screen, and the via holes on the horizontal line at the middle position of the screen are offset towards the left with respect to the via holes corresponding to the conventional screen, so that the position of the finally formed screen printing pattern is aligned with the position of the expected pattern during the screen printing process, thereby improving the matching accuracy between the position of the finally formed screen printing pattern and the position of the expected pattern.
In one embodiment, there is provided a printing apparatus comprising an operating platform, a squeegee blade and a printing screen as described in any of the above embodiments, the printing screen being arranged on the operating platform, the squeegee blade being movable on a side of the web facing away from the operating platform, the squeegee blade being adapted to pass slurry on the web through the apertures.
Above-mentioned printing device, the position of each via hole is along the direction of carrying on the back mutually with the silk screen printing direction protrusion for the offset of via hole along the same direction with the silk screen printing direction reduces when the silk screen printing, and the position of each via hole is protruding towards central horizontal line direction, makes the offset that the via hole orientation kept away from central horizontal line reduce when the silk screen printing, thereby makes the position of the silk screen printing pattern of final formation and the position offset of anticipating the pattern reduce, and then makes the matching precision of the position of the silk screen printing pattern of formation improve.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A printing screen, comprising: the net surface is formed by interweaving a net frame and a plurality of net wires, the net surface is positioned in the net frame, and the end parts of the net wires are connected with the inner side of the net frame;
the wire side has a plurality of via holes, each the via hole is along the direction protrusion that carries on the back with the silk screen printing direction in the predetermined vertical line that corresponds, the middle part of wire side has the central horizontal line parallel with the silk screen printing direction, each the via hole is along the orientation the direction protrusion of central horizontal line is in the predetermined horizontal line that corresponds, wherein, predetermine the vertical line that each via hole corresponds on the vertical line is the anticipated silk screen printing pattern, predetermine vertical line and silk screen printing direction perpendicular, predetermine the horizontal line that each via hole corresponds on the horizontal line is the anticipated silk screen printing pattern, predetermine the horizontal line and be parallel with the silk screen printing direction.
2. The printing screen of claim 1, wherein the vias closer to the central transverse line project from the corresponding predetermined vertical line by a greater distance than the vias further from the central transverse line in a direction opposite to the screen printing direction.
3. The printing screen of claim 2, wherein the distance from the via hole adjacent to the transverse centre line to the via hole remote from the transverse centre line projecting beyond the corresponding predetermined vertical line decreases progressively.
4. The printing screen of claim 3, wherein any two adjacent via holes in a direction perpendicular to the screen printing direction project by an equal difference in distance from the corresponding predetermined vertical line.
5. The printing screen of claim 4, wherein the difference in the distance by which two adjacent via holes in the direction perpendicular to the screen printing direction protrude from the corresponding predetermined vertical line is 3 to 7 μm.
6. The printing screen of claim 1, wherein the vias closer to the central transverse line project beyond the corresponding predetermined transverse line by a smaller distance than the vias further from the central transverse line in a direction perpendicular to the screen printing direction.
7. The printing screen of claim 6, wherein the distance from the via hole adjacent to the central transverse line to the via hole remote from the central transverse line projecting beyond the corresponding predetermined transverse line increases progressively.
8. The printing screen of claim 7, wherein any two adjacent via holes in a direction perpendicular to the screen printing direction project by an equal difference in distance from the corresponding predetermined transverse line.
9. The printing screen of claim 8, wherein the difference in the distance by which two adjacent via holes in the direction perpendicular to the screen printing direction protrude from the corresponding predetermined transverse line is 5-10 μm.
10. A printing unit comprising an operating platform on which the printing screen is disposed, a squeegee blade moveable from a side of the web facing away from the operating platform, the squeegee blade being adapted to pass paste on the web through the apertures, and a printing screen according to any of claims 1 to 9.
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