Machine Vision Integrated Slot Die

Abstract

The present invention relates to a slot die for machine vision integration, and more specifically, to a slot die having a lip from which a coating liquid is discharged at the front end; a first shooting unit formed at one end of the slot die, which illuminates one side of the coating liquid discharged from the lip to the surface of a web with coaxial illumination inside a lens and reflects or refracts it with an optical element at the end of the lens to take a picture with a camera; and a second shooting unit formed at the other end of the slot die to correspond to the first shooting unit, which illuminates the other side of the coating liquid discharged from the lip to the surface of a web with coaxial illumination inside a lens and reflects or refracts it with an optical element at the end of the lens to take a picture with a camera; thereby, since the shooting unit is directly coupled to the slot die and formed integrally, it is possible to minimize shooting alignment errors and improve shooting precision compared to a conventional shooting unit separated from the slot die. In addition, the installation space is minimized compared to conventional ones, so space constraints are greatly resolved and interference with other equipment can be minimized. In addition, the imaging unit enables shadow-free, precise imaging by capturing both sides of the coating liquid through a camera, lens, optical element, and coaxial illumination. Furthermore, an inclined chamfer is formed in the imaging area of ​​each imaging unit on the slot die, thereby blocking interference with the slot die during imaging. Additionally, the camera focal length of the imaging unit can be accurately adjusted by moving the imaging unit via a stage. The analysis module corrects the captured image in real time through an image correction unit, a measurement unit, and a diagnostic unit, performs machine learning on the corrected image, and compares it with an abnormal state judgment model based on the machine-learned data. If an abnormal state is detected, an alarm is immediately triggered, allowing the user to take immediate and early action. This early response can reduce the defect rate in the coating process and improve productivity.

Description

Technology Field

[0001] The present invention relates to a slot die integrated with a machine vision system, and more specifically, to a slot die integrated with a machine vision system in which a shooting unit is directly coupled to the slot die to minimize installation space, minimize shooting alignment errors, and improve shooting precision, and also to an alarm that detects abnormalities in the coating solution by comparing and analyzing images captured by the shooting unit with machine-learned data. Background Technology

[0003] A slot die is a device that applies a coating liquid to a uniform thickness on the surface of a web, which is a material to be coated including a fabric, film, flexible substrate, glass, sheet, etc., and is a coating device widely used in the coating process of various products such as display panels, touch screens, and secondary battery electrodes.

[0004] A typical slot die coating system comprises a reservoir in which a coating solution containing a liquid or solid particle dispersion is stored, a pump connected to the reservoir via a supply line to supply the coating solution to the supply line, a slot die connected to the pump via the supply line to receive the coating solution from the pump, and a valve provided between the pump and the slot die to supply or block the coating solution to the slot die, wherein the slot die applies the coating solution to the surface of a web of a material to be coated, which is transported along a roller, at a predetermined thickness.

[0005] However, as the lip that discharges the coating liquid at the front of the slot die is formed to be extended long along the length of the slot die, local flow non-uniformity of the coating liquid occurs, making it difficult to uniformly apply the coating liquid to the surface of the web at a preset thickness.

[0006] Therefore, conventionally, as shown in FIG. 1, a shooting unit (3) is installed at a predetermined distance from the slot die (1), and the state of the coating liquid discharged from the slot die (1) to the web (2) is captured in real time through the shooting unit (3).

[0007] However, in conventional methods, the slot die and the imaging unit are separated, so the imaging unit occupies a large amount of surrounding space, resulting in many space constraints for installing the imaging unit in cramped workspaces. Additionally, since the imaging unit must be fixed around the slot die, the work is cumbersome and additional costs are incurred. Furthermore, there was a problem in that the relative positional precision between the slot die and the imaging unit was low, making it difficult to accurately image the coating liquid discharged from the lip of the slot die to the web. Prior art literature

[0009] Republic of Korea Registered Publication No. 10-1714627 The problem to be solved

[0010] The present invention aims to solve the aforementioned problems. The objective of the present invention is to provide a slot die for machine vision integrated in which the imaging unit is directly coupled to the slot die, so as to eliminate installation space constraints on the imaging unit and increase the relative positional precision between the slot die and the imaging unit.

[0011] Another objective of the present invention is to provide a slot die integrated with a machine vision system that corrects an image captured by a capturing unit, compares and analyzes the corrected image with machine-learned data, and alarms when an abnormality occurs in the coating liquid discharged to the web. means of solving the problem

[0013] To solve the above problem, a first embodiment of the present invention provides a machine vision integrated slot die comprising: a slot die having a lip from which a coating liquid is discharged at the front end; a first shooting unit coupled to one end of the slot die, which illuminates one side of the coating liquid discharged from the lip to the surface of a web with a coaxial light formed inside a lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens; and a second shooting unit coupled to the other end of the slot die to correspond to the first shooting unit, which illuminates the other side of the coating liquid discharged from the lip to the surface of a web with a coaxial light formed inside a lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens.

[0014] A second embodiment of the present invention comprises: a slot die having a first lip and a second lip from which a coating liquid is discharged to both sides at the front end; a first shooting unit coupled to one end of the slot die, which illuminates one side of the coating liquid discharged from the first lip to the surface of a web with coaxial illumination formed inside a lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens; and a second shooting unit coupled to the other end of the slot die to correspond to the first shooting unit, which illuminates the other side of the coating liquid discharged from the second lip to the surface of a web with coaxial illumination formed inside a lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens. A machine vision integrated slot die is provided, comprising: a third shooting unit coupled to the central groove of the slot die so as to be positioned between the first shooting unit and the second shooting unit, which illuminates together the other side of the coating liquid discharged from the first lip to the surface of the web and the one side of the coating liquid discharged from the second lip to the web by a coaxial light formed inside the lens, reflects or refracts by an optical element formed at the front end of the lens, and captures together by a camera formed at the rear end of the lens.

[0015] A third embodiment of the present invention comprises: a slot die having a first lip and a second lip from which a coating liquid is discharged to both sides at the front end; a first shooting unit coupled to one end of the slot die, which illuminates one side of the coating liquid discharged from the first lip to the surface of a web with a coaxial light formed inside a lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens; and a second shooting unit coupled to the other end of the slot die to correspond to the first shooting unit, which illuminates the other side of the coating liquid discharged from the second lip to the surface of a web with a coaxial light formed inside a lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens. A machine vision integrated slot die is provided, comprising: a 3-1 shooting unit coupled to the central groove of the slot die so as to be positioned between the 3-1 shooting unit and the 2 shooting unit, which illuminates the other side of the coating liquid discharged from the 1 lip to the surface of the web with coaxial illumination on the inner side of the lens, and reflects or refracts it with an optical element at the front end of the lens to take a picture with a camera formed at the rear end of the lens; and a 3-2 shooting unit coupled to the central groove of the slot die so as to be adjacent to the 3-1 shooting unit, which illuminates one side of the coating liquid discharged from the 2 lip to the web with coaxial illumination formed on the inner side of the lens, and reflects or refracts it with an optical element formed at the front end of the lens to take a picture with a camera formed at the rear end of the lens.

[0016] In the first to third embodiments of the present invention, the optical element may include a mirror or a prism.

[0017] In embodiments 1 to 3 of the present invention, the exterior of the optical element may further include: a housing formed to accommodate and protect the optical element inside; and a rotation axis formed on one side of the housing to rotate manually or automatically and adjust the angle of the optical element.

[0018] In the first to third embodiments of the present invention, the front end of the slot die may further include a chamfer formed to be inclined so as not to interfere with the slot die in the shooting area.

[0019] In the first to third embodiments of the present invention, the chamfer inclination angle of the slot die may be 5 to 15 degrees.

[0020] In the first to third embodiments of the present invention, between one end of the slot die and the camera of the first shooting unit, and between the other end of the slot die and the camera of the second shooting unit, a stage for adjusting the focal length by moving the camera of the first shooting unit and the camera of the second shooting unit, respectively, may be further included.

[0021] In the first to third embodiments of the present invention, the stage may include: a fixed member fixed to one end and the other end of the slot die, respectively; a first moving member formed to slide along the fixed member and moved in the lateral direction of the slot die by an actuator; and a second moving member formed to slide along the first moving member and moved in the front-rear direction of the slot die by an actuator, wherein the camera of the first shooting unit and the camera of the first shooting unit are respectively fixed thereto.

[0022] In the first to third embodiments of the present invention, the machine vision integrated slot die further includes an analysis module that receives an image captured by a camera and analyzes whether there is an abnormality in the coating liquid, and the analysis module may include: an image correction unit that corrects a projection error in the captured image; a measurement unit that obtains a measurement value regarding the contact angle and thickness of the coating liquid discharged to the web through the corrected image; and a diagnosis unit that compares the obtained measurement value with an abnormal state determination model based on machine learning data and warns the user with an alarm means if it corresponds to an abnormal state.

[0023] In the first to third embodiments of the present invention, the projection error correction is corrected so that the captured image appears larger than the actual dimensions due to the camera shooting angle, and may include correcting the image to match the lip image measurements shown in the captured image to the actual lip dimensions measured in advance.

[0024] In embodiments 1 to 3 of the present invention, the alarm means may include a speaker that emits a warning sound or a lamp that emits a warning light. Effects of the invention

[0026] Through the above configuration, the present invention can achieve the following effects.

[0027] First, since the imaging unit is directly coupled to the slot die and formed as a single unit, it is possible to minimize imaging alignment errors and improve imaging precision compared to conventional imaging units separated from the slot die. Additionally, the installation space is minimized compared to existing designs, significantly resolving space constraints and minimizing interference with other equipment.

[0028] Second, the imaging unit enables shadow-free, precise imaging by capturing both sides of the coating liquid through a camera, lens, optical element, and coaxial illumination. Additionally, an inclined chamfer is formed in the imaging area of ​​each imaging unit on the slot die, thereby blocking interference with the slot die during imaging. Furthermore, the camera focal length of the imaging unit can be accurately adjusted by moving the imaging unit through a stage.

[0029] Third, the analysis module corrects images captured in real time through an image correction unit, a measurement unit, and a diagnosis unit, machine learns the corrected images, and compares them with an abnormal state judgment model based on machine-learned data; if an abnormal state is detected, it immediately issues an alarm, allowing the user to take immediate and early action. Through this early response, the defect rate in the coating process can be reduced and productivity improved. Brief explanation of the drawing

[0031] Figure 1 is a drawing illustrating the installation state of a conventional slot die and a shooting unit. FIGS. 2a and 2b are drawings illustrating a slot die for machine vision integration according to Example 1 of the present invention. FIG. 3 is a drawing illustrating a slot die for machine vision integration according to Embodiment 2 of the present invention. FIG. 4 is a drawing illustrating a slot die for machine vision integration according to Embodiment 3 of the present invention. FIG. 5 is a drawing illustrating an analysis module installed in a slot die for machine vision integration according to embodiments 1, 2, and 3 of the present invention. FIG. 6 is a drawing for explaining image correction of an analysis module installed in a slot die for machine vision integration according to embodiments 1, 2, and 3 of the present invention. FIG. 7 is a diagram illustrating normal and abnormal coating states analyzed by an analysis module installed on a slot die for machine vision integration according to Examples 1, 2, and 3 of the present invention. Specific details for implementing the invention

[0032] Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0033] In addition, to clearly explain the present invention in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals.

[0034] Throughout this specification, when a part is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0035] As used herein, terms of degree such as “about,” “substantially,” etc., are used to mean at or near the stated value when inherent manufacturing and material tolerances are presented in the stated meaning, and are used to prevent unscrupulous infringers from unfairly exploiting the disclosure in which precise or absolute values ​​are mentioned to aid in understanding the invention. Furthermore, throughout this specification, “a step of” or “a step of” does not mean “a step for”.

[0036] Throughout this specification, the term “combination thereof” included in a Markush-type expression means one or more mixtures or combinations selected from the group consisting of the components described in the Markush-type expression, and means including one or more selected from the group consisting of said components. Throughout this specification, the description “A and / or B” means “A or B, or A and B.”

[0038] <Example 1>

[0039] FIGS. 2a and 2b are drawings illustrating a slot die for machine vision integration according to Example 1 of the present invention.

[0040] Referring to FIG. 2a and FIG. 2b, the slot die (100) for machine vision integration according to Embodiment 1 of the present invention has a structure in which a first imaging unit (120) and a second imaging unit (130) are directly coupled to a slot die (110) having one lip and formed integrally.

[0041] Hereinafter, the configuration of the slot die (100) for machine vision integration according to Embodiment 1 of the present invention will be described in detail as follows.

[0042] A slot die (110) having a lip (111) from which a coating liquid is discharged at a front end (110a); a first shooting unit (120) coupled to one end (110b) of the slot die (110) and illuminating one side (C1) of the coating liquid discharged from the lip (111) to the surface of the web (W) with a coaxial light (123) formed inside a lens (122), reflecting or refracting with an optical element (124) formed at the front end of the lens (122), and capturing with a camera (121) formed at the rear end of the lens (122); and a second shooting unit (130) coupled to the other end (110c) of the slot die (110) to correspond to the first shooting unit (120), illuminating the other side (C2) of the coating liquid discharged from the lip (111) to the surface of the web (W) with a coaxial light (133) formed on the inner side of the lens (132), reflecting or refracting it with an optical element (134) formed on the front end of the lens (132), and capturing it with a camera (131) formed on the rear end of the lens (132).

[0043] The slot die (110) is formed so as to have an extended length in the width direction of the web (W), and one lip (111) of the slot die (110) is formed to protrude forward and approach the surface of the web (W). On both sides of the front end (110a) of the slot die (110), a chamfer (112) is formed at a predetermined angle of inclination to prevent corner interference of the slot die (110) in the shooting area of ​​the first shooting unit (120) and the shooting area of ​​the second shooting unit (130). At this time, the angle of inclination of the chamfer (112) of the slot die (110) is preferably 5 to 15 degrees, but the present invention is not limited thereto.

[0044] The first imaging unit (120) comprises: a camera (121) positioned at one end (110b) of the slot die (110) at a right angle to the discharge surface (111a) of the lip (111); a lens (122) with its rear end fixed to the camera (121) and protruding parallel to one end (110b) of the slot die (110); an optical element (124) formed of a mirror or prism fixed to the front end of the lens (122) to reflect or refract one side (C1) of the coating liquid discharged from the lip (111) to the surface of the web (W) so that the camera (121) can see it; and a coaxial light source (123) fixed to the inner side of the lens (122) to reflect light through the optical element (124) to illuminate one side (C1) of the coating liquid discharged from the lip (111) to the surface of the web (W). It is formed as.

[0045] The second imaging unit (130) comprises: a camera (131) positioned at the other end (110c) of the slot die (110) at a right angle to the discharge surface (111a) of the lip (111); a lens (132) with its rear end fixed to the camera (131) and protruding parallel to the other end (100c) of the slot die (110); an optical element (134) formed of a mirror or prism fixed to the front end of the lens (132) to reflect or refract the other side (C2) of the coating liquid discharged from the lip (111) to the surface of the web (W) so that the camera (131) can see it; and a coaxial light source (133) fixed to the inner side of the lens (132) to reflect light through the optical element (134) to illuminate the other side (C2) of the coating liquid discharged from the lip (111) to the surface of the web (W). It is formed as.

[0046] The above cameras (121) and (131) are each formed to maintain a repeatability of 1 μm. That is, the repeatability is such that when the cameras (121) and (131) photograph and measure an object multiple times at the same location, the same result is always obtained, and the repeatability of 1 μm means that the shooting position error is maintained within 1 μm (0.001 mm).

[0047] The above lenses (122) and (132) are each fixed to the camera (121) and (131), respectively, and are extended so that their ends are positioned on one side (C1) and the other side (C2) of the coating liquid, respectively, and are formed to precisely magnify one side (C1) and the other side (C2) of the coating liquid, respectively.

[0048] The above coaxial lights (123)(133) are fixed to the inside of the lens (122)(132) and reflect light through the optical element (124)(134) to illuminate one side (C1) and the other side (C2) of the coating liquid, respectively, and when the above coaxial lights (123)(133) are used, no shadows are generated in the captured image. In addition, the above coaxial lights (123)(133) are formed so that when one directly illuminates the side of the coating liquid, the other indirectly illuminates the same side of the coating liquid, thereby allowing the camera (121)(131) to capture the side shape and surface condition of the coating liquid more clearly and precisely.

[0049] On the outside of the optical elements (124) (134), a housing (125) (135) is formed to accommodate and protect the optical elements (124) (134) inside, and on one side of the housing (125) (135), a rotation axis (126) (136) is formed to rotate manually or automatically and adjust the angle of the optical elements (124) (134). Considering that the inclination angle of the chamfer (112) of the slot die (110) is 5 to 15 degrees, the angle of the optical elements (124) (134) is preferably approximately 5 to 15 degrees or less, but the present invention is not limited thereto.

[0050] Between one end (110b) of the slot die (110) and the camera (121) of the first shooting unit (120), and between the other end (110c) of the slot die (110) and the camera (131) of the second shooting unit (130), a stage (160) is formed to move the camera (121) of the first shooting unit (120) and the camera (131) of the second shooting unit (130), respectively, to adjust the focal length and the image. The stage (160) comprises: a fixed member (161) fixed to one end (110a) and the other end (110b) of the slot die (110), respectively; and a first moving member (162) connected to the fixed member (161) to slide and moved in the lateral direction of the slot die (110) by means of an actuator (164). and a second moving platform (163) connected to slide along the first moving platform (162) and moved in the forward and backward directions of the slot die (110) by an actuator (164), and to which the camera (121) of the first shooting unit (120) and the camera (131) of the second shooting unit (130) are respectively fixed; is formed.

[0052] <Example 2>

[0053] FIG. 3 is a drawing illustrating a slot die for machine vision integration according to Embodiment 2 of the present invention.

[0054] Referring to FIG. 3, the slot die (200) for machine vision integration according to Embodiment 2 of the present invention has a structure in which a first imaging unit (220), a second imaging unit (230), and a third imaging unit (240) are directly coupled to a slot die (210) having two ribs and formed integrally.

[0055] Hereinafter, the configuration of the slot die (100) for machine vision integration according to Embodiment 2 of the present invention will be described in detail as follows.

[0056] A slot die (210) having a first lip (211) and a second lip (212) on which a coating liquid is discharged to both sides at a front end (210a); a first shooting unit (220) coupled to one end (210b) of the slot die (210) and illuminating one side (C1) of the coating liquid discharged from the first lip (211) to the surface of the web (W) with a coaxial light (223) formed on the inner side of a lens (222), reflecting or refracting it with an optical element (224) formed at the front end of the lens (222), and capturing it with a camera (221) formed at the rear end of the lens (222); A second shooting unit (230) coupled to the other end (210c) of the slot die (210) to correspond to the first shooting unit (220), illuminating the other side (C2) of the coating liquid discharged from the second lip (212) to the surface of the web (W) with a coaxial light (233) formed inside the lens (232), and reflecting or refracting it with an optical element (234) formed at the front end of the lens (232) to take a picture with a camera (231) formed at the rear end of the lens (232); The third shooting unit (240) is coupled to the central groove (213) of the slot die (210) so as to be positioned between the first shooting unit (220) and the second shooting unit (230), and together illuminates the other side (C2) of the coating liquid discharged from the first lip (211) to the surface of the web (W) and the one side (C1) of the coating liquid discharged from the second lip (212) to the web (W) together with a coaxial light (243) formed inside the lens (242), and reflects or refracts the light with an optical element (244) formed at the front end of the lens (242) and together photographs it with a camera (241) formed at the rear end of the lens (242).

[0057] The slot die (210) is formed so as to have an extended length in the width direction of the web (W), and the first lip (211) and the second lip (212) are formed to protrude forward of the slot die (210) respectively and to be close to the surface of the web (W) respectively. On both sides and the central portion of the front end (210a) of the slot die (210), a chamfer (214) inclined at a predetermined angle is formed to prevent interference with the slot die (210) in the shooting area of ​​the first shooting unit (220), the shooting area of ​​the second shooting unit (230), and the shooting area of ​​the third shooting unit (240), respectively. At this time, the angle of inclination of the chamfer (214) of the slot die (210) is preferably 5 to 15 degrees, but the present invention is not limited thereto.

[0058] The first imaging unit (220) comprises: a camera (221) positioned at one end (210b) of the slot die (210) at a right angle to the discharge surface (211a) of the first lip (211); a lens (222) with its rear end fixed to the camera (221) and protruding parallel to one end (210b) of the slot die; and an optical element (224) formed of a mirror or prism fixed to the front end of the lens (222) and reflecting or refracting one side (C1) of the coating liquid discharged from the first lip (211) to the surface of the web (W) so that the camera (221) can see it. It is formed by a coaxial light (223) that is fixed to the inner side of the lens (222) and reflects light through the optical element (224) to illuminate one side (C1) of the coating liquid discharged from the first lip (211) to the surface of the web (W).

[0059] The second imaging unit (230) comprises: a camera (231) positioned at the other end (210c) of the slot die (210) at a right angle to the discharge surface (212a) of the second lip (212); a lens (232) with its rear end fixed to the camera (231) and protruding parallel to the other end (210c) of the slot die (210); and an optical element (234) formed of a mirror or prism fixed to the front end of the lens (232) to reflect or refract the other side (C2) of the coating liquid discharged from the second lip (212) to the surface of the web (W) so that the camera (231) can see it. It is formed by a coaxial light (233) that is fixed to the inner side of the lens (232) and reflects light through the optical element (234) to illuminate the other side (C2) of the coating liquid discharged from the second lip (212) to the surface of the web (W).

[0060] The third shooting unit (240) comprises: a camera (241) positioned in the central groove (213) of the slot die (210) so as to be located between the first shooting unit (220) and the second shooting unit (230); a lens (242) with its rear end fixed to the camera (241) and protruding toward the front end of the slot die (210); and an optical element (244) formed of a mirror or prism fixed to the front end of the lens (242) that reflects or refracts the other side (C2) of the coating liquid discharged from the first lip (211) to the surface of the web (W) and the one side (C1) of the coating liquid discharged from the second lip (212) to the web (W) together so that the camera (241) can see them. It is formed by a coaxial illumination (243) that is fixed to the inner side of the lens (242) and reflects light through the optical element (244) to illuminate together the other side (C2) of the coating liquid discharged from the first lip (211) to the surface of the web (W) and the one side (C1) of the coating liquid discharged from the second lip (212) to the web (W).

[0061] A stage (260) is formed between one end (210b) of the slot die (210) and the camera (221) of the first shooting unit (220), and between the other end (210c) of the slot die (210) and the camera (231) of the second shooting unit (230), respectively, to move the camera (221) of the first shooting unit (220) and the camera (231) of the second shooting unit (230) to adjust the focal length.

[0062] Since the detailed configuration of the above stage (260) is the same as in Example 1, the description is omitted in Example 2 of the present invention.

[0064] <Example 3>

[0065] FIG. 4 is a drawing illustrating a slot die for machine vision integration according to Embodiment 3 of the present invention.

[0066] Referring to FIG. 4, the slot die (300) for machine vision integration according to Embodiment 3 of the present invention has a structure in which a first imaging unit (320), a second imaging unit (330), a third-1 imaging unit (340), and a third-2 imaging unit (350) are directly coupled to a slot die (310) having two ribs and formed integrally.

[0067] Hereinafter, the configuration of the slot die (300) for machine vision integration according to Embodiment 3 of the present invention will be described in detail as follows.

[0068] A slot die (310) having a first lip (311) and a second lip (312) on which a coating liquid is discharged to both sides at the front end (310a); a first shooting unit (320) coupled to one end of the slot die (310) and illuminating one side (C1) of the coating liquid discharged from the first lip (311) to the surface of the web (W) with a coaxial light (323) formed inside the lens (322), reflecting or refracting with an optical element (324) formed at the front end of the lens (322), and capturing with a camera (321) formed at the rear end of the lens (322); A second shooting unit (330) coupled to the other end (310c) of the slot die (310) to correspond to the first shooting unit (320), illuminating the other side (C2) of the coating liquid discharged from the second lip (312) to the surface of the web (W) with a coaxial light (333) formed inside the lens (332), and reflecting or refracting it with an optical element (334) formed at the front end of the lens (332) to take a picture with a camera (331) formed at the rear end of the lens (332); A third-1 shooting unit (340) coupled to the central groove (313) of the slot die (310) so as to be positioned between the first shooting unit (320) and the second shooting unit (330), illuminating the other side (C2) of the coating liquid discharged from the first lip (311) to the surface of the web (W) with a coaxial light (343) inside the lens (342), and reflecting or refracting with an optical element (344) at the front end of the lens (342) to take a picture with a camera (341) formed at the rear end of the lens (342); The third-2 shooting unit (350) is coupled to the central groove (313) of the slot die (310) so as to be adjacent to the third-1 shooting unit (340) and illuminates one side (C1) of the coating liquid discharged from the second lip (312) to the web (W) with a coaxial light (353) formed on the inner side of the lens (352), reflects or refracts it with an optical element (354) formed on the front end of the lens (352), and captures it with a camera (351) formed on the rear end of the lens (352).

[0069] The slot die (310) is formed so as to have an extended length in the width direction of the web (W), and the first lip (311) and the second lip (312) are formed to protrude forward of the slot die (310) and respectively approach the surface of the web (W). On both sides and the central portion of the front end (310a) of the slot die (310), a chamfer (314) is formed at a predetermined angle of inclination to prevent interference with the slot die (310) in the shooting area of ​​the first shooting unit (320), the shooting area of ​​the second shooting unit (330), the shooting area of ​​the third-1 shooting unit (340), and the shooting area of ​​the third-2 shooting unit (350), respectively. At this time, the angle of inclination of the chamfer (314) of the slot die (310) is preferably 5 to 15 degrees, but the present invention is not limited thereto.

[0070] The first imaging unit (320) comprises: a camera (321) positioned at one end (310b) of the slot die (310) at a right angle to the discharge surface (311a) of the first lip (311); a lens (322) fixed to the rear end of the camera (321) and protruding parallel to the one end (310b) of the slot die; and an optical element (224) formed of a mirror or prism fixed to the front end of the lens (322) to reflect or refract one side (C1) of the coating liquid discharged from the first lip (311) to the surface of the web (W) so that the camera (321) can see it. It is formed by a coaxial light (323) that is fixed to the inner side of the lens (322) and reflects light through the optical element (324) to illuminate one side (C1) of the coating liquid discharged from the first lip (311) to the surface of the web (W).

[0071] The second imaging unit (330) comprises: a camera (331) positioned at the other end (310c) of the slot die (310) at a right angle to the discharge surface (312a) of the second lip (312); a lens (332) fixed to the rear end of the camera (331) and protruding parallel to the other end (310c) of the slot die (310); and an optical element (334) formed of a mirror or prism fixed to the front end of the lens (332) to reflect or refract the other side (C2) of the coating liquid discharged from the second lip (312) to the surface of the web (W) so that the camera (331) can see it. It is formed by a coaxial light (333) that is fixed to the inner side of the lens (332) and reflects light through the optical element (334) to illuminate the other side (C2) of the coating liquid discharged from the second lip (312) to the surface of the web (W).

[0072] The above 3-1 shooting unit (340) is formed by: a camera (341) positioned in the central groove (313) of the slot die (310) so as to be located between the first shooting unit (320) and the second shooting unit (330); a lens (342) with its rear end fixed to the camera (341) and protruding toward the front end of the slot die (310); an optical element (344) formed of a mirror or prism fixed to the front end of the lens (342) and reflecting or refracting the other side (C2) of the coating liquid discharged from the first lip (311) to the surface of the web (W) so that the camera (341) can see it; and a coaxial light (343) fixed to the inner side of the lens (342) and reflecting light through the optical element (344) to illuminate the other side (C2) of the coating liquid discharged from the first lip (311) to the surface of the web (W).

[0073] The above 3-2 shooting unit (350) is formed by: a camera (351) positioned in the central groove (313) of the slot die (310) so as to be adjacent to the above 3-1 shooting unit (340); a lens (352) with its rear end fixed to the camera (351) and protruding toward the front end of the slot die (310); an optical element (354) formed of a mirror or prism fixed to the front end of the lens (352) and reflecting or refracting one side (C1) of the coating liquid discharged from the second lip (312) to the surface of the web (W) so that the camera (351) can see it; and a coaxial light (353) fixed to the inner side of the lens (352) and reflecting light through the optical element (354) to illuminate one side (C1) of the coating liquid discharged from the second lip (312) to the surface of the web (W).

[0074] A stage (360) is formed between one end (310b) of the slot die (310) and the camera (321) of the first shooting unit (320), and between the other end (310c) of the slot die (310) and the camera (331) of the second shooting unit (330), respectively, to move the camera (321) of the first shooting unit (320) and the camera (331) of the second shooting unit (330) to adjust the focal length.

[0075] Since the detailed configuration of the above stage (360) is the same as in Example 1, the description is omitted in Example 3 of the present invention.

[0076] FIG. 5 is a drawing illustrating an analysis module installed in a slot die for machine vision integration according to embodiments 1, 2, and 3 of the present invention, FIG. 6 is a drawing for explaining image correction of the analysis module installed in a slot die for machine vision integration according to embodiments 1, 2, and 3 of the present invention, and FIG. 7 is a drawing illustrating normal and abnormal coating states analyzed by the analysis module installed in a slot die for machine vision integration according to embodiments 1, 2, and 3 of the present invention.

[0077] Referring to FIG. 5, the machine vision integrated slot die (100, 200, 300) according to embodiments 1, 2, and 3 of the present invention comprises an analysis module (400) that receives images captured by cameras (121, 131, 221, 231, 241, 321, 331, 341, 351) respectively and analyzes whether there is an abnormality in the coating liquid discharged to the web (W).

[0078] The analysis module (400) comprises: an image correction unit (410) that corrects projection errors in the captured image; a measurement unit (420) that obtains measurements for the contact angle and thickness of the coating liquid discharged to the web (W) through the corrected image; and a diagnosis unit (430) that compares the obtained measurements with an abnormal state determination model based on machine learning data and warns the user via an alarm means (431) if it corresponds to an abnormal state.

[0079] The above alarm means is preferably formed as a speaker that emits a warning sound or a lamp that emits a warning light, but the present invention is not limited thereto.

[0080] Referring to FIG. 2a, the contact angle of the coating liquid refers to the angle at which the coating liquid discharged from the lip (111) contacts the web (W), and the thickness of the coating liquid refers to the thickness of the coating liquid applied (coated) to the web (W) from the lip (111). The image correction unit (410) corrects the distorted contact angle of the coating liquid and the thickness of the coating liquid in the captured image through projection error correction, and subsequently, the measurement unit (420) obtains measurements of the contact angle of the coating liquid and the thickness of the coating liquid in real time through the corrected image.

[0081] Referring to FIG. 6, the projection error correction corrects the fact that the captured image appears larger than the actual dimensions due to the camera shooting angle, and corrects the image by matching the distorted lip image measurements shown in the captured image to the actual lip dimensions measured in advance. Therefore, when the projection error is corrected, the contact angle and thickness of the coating liquid that are not distorted appear in the corrected image.

[0082] Accordingly, the diagnostic unit (430) compares measurements of the contact angle and thickness of the coating liquid in the corrected image with a machine learning data-based abnormal state determination model in real time, and if an abnormal coating state is detected as shown in FIG. 7, it warns the user with an alarm means (431), thereby allowing the user to take immediate action, and thus, the defect rate in the coating process can be lowered and productivity improved through early response. Explanation of the symbols

[0084] 100, 200, 300: Machine Vision Integrated Slot Die 110, 210, 310: Slot Die 111: Lip 211, 311: The 1st Lip 212, 312: The Second Lip 120, 220, 320: 1st Camera Unit 130, 230, 330: 2nd Camera Unit 240: 3rd Camera Unit 340: 3-1 Filming Department 350: 3-1 Filming Department 160: 260: 360: Stage 400: Analysis Module 410: Image Correction Unit 420: Measurement section 430: Diagnostic Department 431: Alarm means C1: One side of the coating solution C2: One side of the coating solution W: Web

Claims

Claim 1 A machine vision integrated slot die comprising: a slot die having a lip from which a coating liquid is discharged at the front end; a first shooting unit coupled to one end of the slot die, which illuminates one side of the coating liquid discharged from the lip to the surface of a web with a coaxial light formed inside a lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens; and a second shooting unit coupled to the other end of the slot die to correspond to the first shooting unit, which illuminates the other side of the coating liquid discharged from the lip to the surface of a web with a coaxial light formed inside a lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens. Claim 2 A slot die having a first lip and a second lip on the front end through which a coating liquid is discharged to both sides; a first shooting unit coupled to one end of the slot die, which illuminates one side of the coating liquid discharged from the first lip to the surface of the web with coaxial illumination formed inside the lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens; and a second shooting unit coupled to the other end of the slot die to correspond to the first shooting unit, which illuminates the other side of the coating liquid discharged from the second lip to the surface of the web with coaxial illumination formed inside the lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens. A machine vision integrated slot die comprising: a third shooting unit coupled to the central groove of the slot die so as to be positioned between the first shooting unit and the second shooting unit, which together illuminates the other side of the coating liquid discharged from the first lip to the surface of the web and the one side of the coating liquid discharged from the second lip to the web with a coaxial light formed on the inner side of the lens, reflects or refracts the images with an optical element formed at the front end of the lens, and together captures them with a camera formed at the rear end of the lens. Claim 3 A slot die having a first lip and a second lip from which a coating liquid is discharged to both sides at the front end; a first shooting unit coupled to one end of the slot die, which illuminates one side of the coating liquid discharged from the first lip to the surface of the web with a coaxial light formed inside the lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens; a second shooting unit coupled to the other end of the slot die to correspond to the first shooting unit, which illuminates the other side of the coating liquid discharged from the second lip to the surface of the web with a coaxial light formed inside the lens, reflects or refracts it with an optical element formed at the front end of the lens, and photographs it with a camera formed at the rear end of the lens; and a central groove of the slot die coupled to be located between the first shooting unit and the second shooting unit, which illuminates the other side of the coating liquid discharged from the first lip to the surface of the web with a coaxial light formed inside the lens, and reflects or refracts it with an optical element at the front end of the lens, thereby the lens A machine vision integrated slot die comprising: a 3-1 shooting unit that takes a picture with a camera formed at the rear end; and a 3-2 shooting unit coupled to the central groove of the slot die so as to be adjacent to the 3-1 shooting unit, which illuminates one side of a coating liquid discharged from the second lip to the web with a coaxial light formed on the inner side of the lens, and reflects or refracts it with an optical element formed at the front end of the lens to take a picture with a camera formed at the rear end of the lens. Claim 4 In any one of claims 1 to 3, the optical element comprises a mirror or a prism, forming a machine vision integrated slot die. Claim 5 A machine vision integrated slot die, wherein, in any one of claims 1 to 3, the machine vision integrated slot die further comprises: a housing formed on the outside of the optical element to accommodate and protect the optical element inside; and a rotation axis formed on one side of the housing to rotate manually or automatically and adjust the angle of the optical element. Claim 6 A machine vision integrated slot die according to any one of claims 1 to 3, further comprising a chamfer formed at the front end of the slot die to be inclined so as not to interfere with the slot die in the imaging area. Claim 7 A machine vision integrated slot die according to claim 6, wherein the chamfer inclination angle of the slot die is 5 to 15 degrees. Claim 8 A machine vision integrated slot die according to any one of claims 1 to 3, wherein the stage for adjusting the focal length by moving the camera of the first shooting unit and the camera of the second shooting unit, respectively, is further included between one end of the slot die and the camera of the first shooting unit and between the other end of the slot die and the camera of the second shooting unit. Claim 9 In claim 8, the machine vision integrated slot die comprises: a fixed member fixed to one end and the other end of the slot die, respectively; a first moving member formed to slide along the fixed member and moved in the lateral direction of the slot die by an actuator; and a second moving member formed to slide along the first moving member and moved in the front-rear direction of the slot die by an actuator, wherein the camera of the first imaging unit and the camera of the first imaging unit are respectively fixed thereto. Claim 10 In any one of claims 1 to 3, the machine vision integrated slot die further comprises an analysis module that receives an image captured by a camera and analyzes whether there is an abnormality in the coating liquid, wherein the analysis module comprises: an image correction unit that corrects a projection error in the captured image; a measurement unit that obtains measurements regarding the contact angle and thickness of the coating liquid discharged to the web through the corrected image; and a diagnosis unit that compares the obtained measurements with an abnormal state determination model based on machine learning data and warns the user via an alarm means if an abnormal state is detected. Claim 11 In claim 10, the projection error correction is a correction that compensates for the fact that the captured image appears larger than the actual dimensions due to the camera shooting angle, and includes correcting the image to match the lip image measurements shown in the captured image to the pre-measured actual lip dimensions, in a machine vision integrated slot die. Claim 12 In claim 10, the above alarm means comprises a speaker that emits a warning sound or a lamp that emits a warning light; a machine vision integrated slot die.

Images