Thickness measuring system

Abstract

The present invention relates to a thickness measuring system, and more particularly, to a thickness measuring system capable of significantly reducing a measurement error due to a positional relationship between a target object to be measured and a sensor when measuring the thickness of a bag, the present invention relates to a thickness measurement system, in particular to a thickness measurement system that significantly reduces thickness measurement errors of corners of a pouch disposed with curved surfaces having various curvatures. The thickness measuring system according to the present invention comprises: a stage device including a mounting part on which a target object to be measured in thickness is mounted and a moving part configured to move the mounting part; a displacement sensor device including a first displacement sensor disposed on one side of the target object to measure a distance to the target object and a second displacement sensor disposed on the other side of the target object to measure a distance to the target object; and a processing device configured to obtain a thickness value of the target object based on measurement values of the first displacement sensor and the second displacement sensor, in which the displacement sensor device performs measurement only when the incident angle is within a predetermined angle and does not perform measurement when the incident angle is outside the predetermined angle, the incident angle is an angle between light emitted by the first displacement sensor or the second displacement sensor and a normal perpendicular to the surface of the target object to be measured.

Description

Technical Field

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2023-0066356, filed on May 23, 2023, which is hereby incorporated by reference in its entirety.

[0003] Field of Technology

[0004] The present invention relates to a thickness measurement system, and more particularly, to a thickness measurement system capable of significantly reducing measurement errors caused by the positional relationship between a target object to be measured and a sensor when measuring the thickness of a bag, and in particular significantly reducing thickness measurement errors at corners of the bag provided with curved surfaces having various curvatures. Background Art

[0005] Secondary batteries that can be repeatedly charged and discharged can be categorized into cylindrical, prismatic, and pouch-type batteries, depending on their structure and manufacturing methods. Pouch-type batteries are manufactured by housing an electrode assembly within a pouch sheet and then sealing the pouch. Compared to other types of secondary batteries, pouch-type batteries have a simpler structure and a higher capacity per unit volume, making them widely used in vehicle batteries, energy storage devices, and more.

[0006] In more detail, a pouch-type secondary battery can be generally manufactured by the following process: after forming a cup having a concave shape in a pouch sheet, accommodating an electrode assembly in the cup, and then folding the pouch sheet so that a region of the pouch sheet covers the electrode assembly, thereby forming a sealing portion that seals the periphery of the electrode assembly.

[0007] This pouch-type secondary battery is provided with a protruding electrode lead so that the pouch-type secondary battery is electrically connected to external components. Here, a sealing portion is provided to cover the electrode lead.

[0008] To assemble a pouch-type battery, a pouch case is required in which a cup-shaped part matching the shape of the electrode assembly is formed, so that the electrode assembly, in which the negative electrode, separator, positive electrode, and separator are alternately stacked, is inserted into the pouch case. Here, a mold (pouch forming device) can be used to form the cup-shaped part.

[0009] In this case, if the thickness of the bag becomes thinner due to bag forming, there is a risk of rupture, so the thickness of the bag needs to be managed so that the thickness does not become thinner than the appropriate value. Therefore, it is necessary to accurately measure the thickness of the bag.

[0010] However, in the related art, when measuring the thickness of a bag, there is a problem in that accurate thickness measurement is difficult due to a large measurement error caused by the positional relationship between the bag surface (which is the target object to be measured) and the sensor. This problem is more prominent in the curved portion of the bag.

[0011] Figure 1 is a perspective view of a corner of a bag according to the related art. Figure 1 , set in Figure 1 The bag corners at positions corresponding to the vertices of the bag having the illustrated rectangular parallelepiped shape may be portions formed with curved surfaces having various curvatures, and thus are portions where a large thickness measurement error occurs.

[0012] Figure 2 : is a cross-sectional view showing a state in which a thickness measuring sensor according to the related art measures the thickness of a bag. Figure 2 , when measuring thickness using a thickness measuring device according to the related art, a thickness error may occur if light emitted from a thickness measuring sensor reaches the bag at a certain angle.

[0013] The principle of measuring thickness by the thickness measuring device is as follows. Each of the upper displacement sensor and the lower displacement sensor emits light, and after the emitted light collides with the surface of the bag, the light returns to each displacement sensor. In this process, the distance between each displacement sensor and the surface of the bag is measured. That is, the distance between the upper displacement sensor and the bag and the distance between the lower displacement sensor and the bag are all obtainable. In addition, since the distance between the upper displacement sensor and the lower displacement sensor is a fixed known value, the thickness of the bag can be obtained by subtracting the distance from the upper displacement sensor to the bag and the distance from the lower displacement sensor to the bag in sequence from the distance between the two sensors. Since the principle of obtaining the thickness of a target object using a displacement sensor is well known in the industry, a detailed description will be omitted.

[0014] refer to Figure 2 , if the incident angle (the incident angle is the angle between the normal vector V perpendicular to the surface of the target bag and the light emitted by the displacement sensor) is θ, and the thickness measured by the displacement sensor is t', the measured value t' is a value greater than the actual thickness of the bag.

[0015] In other words, the relationship t' = t / cosθ is established. Errors are particularly likely to occur at the corners of the bag, corresponding to the vertices of the rectangular parallelepiped bag. Because the corners of the bag have curved surfaces with large and varied curvatures at various locations, corners are prone to more thickness measurement errors.

[0016] However, the corner of the bag at this position is stretched and molded to have the thinnest thickness. Therefore, since the corner of the bag at this position is the part that is particularly likely to crack, it is more necessary to solve the problem of thickness measurement error. Summary of the Invention

[0017] Technical issues

[0018] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a thickness measuring system that can significantly reduce the measurement error caused by the positional relationship between the target object to be measured and the sensor when measuring the thickness of a bag, especially significantly reduce the thickness measurement error at the corners of the bag provided with curved surfaces having various curvatures.

[0019] Technical Solution

[0020] According to the present invention, a thickness measurement system includes: a stage device, the stage device including a placement portion and a moving portion, the placement portion having a target to be measured for thickness placed thereon, the moving portion being configured to move the placement portion; a displacement sensor device, the displacement sensor device including a first displacement sensor and a second displacement sensor, the first displacement sensor being disposed on one side of the target to measure the distance to the target, and the second displacement sensor being disposed on the other side of the target to measure the distance to the target; and a processing device, the processing device being configured to obtain a thickness value of the target based on measurement values ​​of the first displacement sensor and the second displacement sensor, wherein the displacement sensor device performs measurement only when an incident angle is within a predetermined angle, and does not perform measurement when the incident angle is outside the predetermined angle, the incident angle being the angle between light emitted by the first displacement sensor or the second displacement sensor and a normal perpendicular to a surface of the target to be measured.

[0021] The first displacement sensor and the second displacement sensor may be respectively disposed on one side and the other side of the curved surface of the target object to perform measurement at a point on the curved surface.

[0022] At least one of the first displacement sensor or the second displacement sensor may include: a light receiving lens configured to receive reflected light reflected from the surface of the target object; and a sensor body on which the light receiving lens is mounted and into which light passing through the light receiving lens is incident, wherein when the incident angle is within the predetermined angle, the reflected light may be incident on the light receiving lens and the sensor body, and when the incident angle is outside the predetermined angle, the reflected light may not be incident on the light receiving lens and the sensor body.

[0023] The predetermined angle may become smaller as the diameter of the light-receiving lens decreases.

[0024] The predetermined angle may have a value between 0° and 1° (degrees).

[0025] The processing device may obtain the thickness value of the target object only when the incident angle is within the predetermined angle, and may not obtain the thickness value of the target object when the incident angle is outside the predetermined angle.

[0026] The thickness measurement system may further include a sensor gauge configured to move at least one of the first displacement sensor or the second displacement sensor upward or downward.

[0027] The moving portion may include a linear moving portion configured to move the mounting portion in x-axis, y-axis, and z-axis directions, which are three axes orthogonal to each other in a three-dimensional space.

[0028] The moving portion may include a posture control plate having one side connected to the mounting portion and the other side extending in a direction away from the displacement sensor device. The linear moving portion may be connected to the posture control plate to move the posture control plate in the x-axis, y-axis, and z-axis directions, so that the mounting portion moves in the x-axis, y-axis, and z-axis directions.

[0029] The linear moving portion may include a pillar portion connected to the other side of the posture control plate to support the other side, an x-axis gauge having a screw structure and configured to move the pillar portion toward the x-axis, a y-axis gauge having a screw structure and configured to move the pillar portion toward the y-axis, and a z-axis gauge having a screw structure and configured to move the pillar portion toward the z-axis.

[0030] The moving portion may include a rotation-movement portion configured to rotate and move the seating portion in a three-dimensional space.

[0031] The moving portion may include a posture control plate having one side connected to the mounting portion and the other side extending in a direction away from the displacement sensor device, and the rotational moving portion may be connected to the posture control plate to rotate and move the mounting portion when the posture control plate rotates and moves.

[0032] The rotational movement portion may include a support column portion connected to the other side of the posture control board to support the other side and having a square top surface facing the posture control board, a first gauge mounted on the support column portion and configured to move the posture control board upward or downward at a point corresponding to one corner of the square, and a second gauge mounted on the support column portion and configured to move the posture control board upward or downward at a point corresponding to a corner of the square opposite to a position where the first gauge is mounted.

[0033] Beneficial effects

[0034] When measuring the thickness of a bag, the thickness measurement system can significantly reduce the measurement error caused by the positional relationship between the target object to be measured and the sensor, especially significantly reduce the thickness measurement error of the corner of the bag set with a curved surface with various curvatures. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a perspective view of a corner portion of a bag according to the related art.

[0036] Figure 2 is a cross-sectional view illustrating a state in which a thickness measuring sensor according to the related art measures the thickness of a bag.

[0037] Figure 3 is a perspective view of a thickness measuring system according to Embodiment 1 of the present invention.

[0038] Figure 4 yes Figure 3 An enlarged perspective view of part A.

[0039] Figure 5 is a cross-sectional view showing a state in which light emitted from the displacement sensor is vertically incident on the surface of a target object.

[0040] Figure 6 It is shown in Figure 5 A cross-sectional view of a state where the thickness value of a bag is measured in a state of

[0041] Figure 7 2 is a cross-sectional view showing a state in which light emitted from a displacement sensor is incident obliquely on a surface of a target object.

[0042] Figure 8 (a) is a perspective view showing a state in which the moving portion moves the placement portion along the x-axis. Figure 8 (b) is a conceptual diagram illustrating a process of searching for the position of the bag corner when the placement portion moves along the x-axis.

[0043] Figure 9 (a) is a perspective view showing a state in which the moving portion moves the placement portion along the y-axis. Figure 9(b) is a conceptual diagram illustrating a process of searching for the position of the bag corner when the placement portion moves along the y-axis.

[0044] Figure 10 is a perspective view of a thickness measurement system according to Example 2 of the present invention.

[0045] Figure 11 1 is a perspective view showing a state where a rotational moving portion is viewed from the lower side of a posture control plate of a thickness measurement system according to Embodiment 2 of the present invention.

[0046] Figure 12 This is a conceptual diagram illustrating the principle of measuring the thickness of a bag corner when the rotational movement portion rotationally moves the placement portion. DETAILED DESCRIPTION

[0047] Hereinafter, the preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. However, the present invention can be implemented in several different forms and is not limited or restricted by the following examples.

[0048] In order to clearly explain the present invention, parts that are not relevant to the description or detailed descriptions of related known technologies that may unnecessarily obscure the main points of the present invention have been omitted, and in this specification, reference symbols are added to the components in each drawing. In this case, the same or similar reference numerals are assigned to the same or similar elements throughout the specification.

[0049] Furthermore, the terms or words used in the specification and claims should not be restrictively interpreted as ordinary meanings or dictionary-based meanings, but should be interpreted as meanings and concepts consistent with the scope of the invention based on the principle that the inventor can appropriately define the concepts of the terms to best describe and explain his or her invention.

[0050] Example 1

[0051] Figure 3 is a perspective view of a thickness measuring system according to Embodiment 1 of the present invention. Figure 4 yes Figure 3 An enlarged perspective view of part A. Figure 5 is a cross-sectional view showing a state in which light emitted from the displacement sensor is vertically incident on the surface of a target object. Figure 6 It is shown in Figure 5 A cross-sectional view of a state where the thickness value of a bag is measured in a state of Figure 7 2 is a cross-sectional view showing a state in which light emitted from a displacement sensor is incident obliquely on a surface of a target object. Figure 8 (a) is a perspective view showing a state in which the moving portion moves the placement portion along the x-axis. Figure 8(b) is a conceptual diagram illustrating a process of searching for the position of the bag corner when the placement portion moves along the x-axis. Figure 9 (a) is a perspective view showing a state in which the moving portion moves the placement portion along the y-axis. Figure 9 (b) is a conceptual diagram illustrating a process of searching for the position of the bag corner when the placement portion moves along the y-axis.

[0052] Reference Figure 3 and Figure 4 , the thickness measurement system 10 according to Embodiment 1 of the present invention includes a stage device 100, a displacement sensor device 200, and a processing device (not shown).

[0053] Here, the stage device 100 includes a placement portion 110 and a moving portion 120. The placement portion 110 can be configured to place a target object P whose thickness is to be measured. Here, the target object P can be a secondary battery pouch. The secondary battery pouch can be arranged as a multi-layer structure. When the side of the pouch that houses the electrode assembly is referred to as the inner side, the pouch can have a three-layer structure of a polypropylene (PP) layer, an aluminum (Al) layer, and a polyethylene terephthalate (PET) layer from the innermost side. Alternatively, the pouch can have a structure of a polypropylene (PP) layer, an aluminum (Al) layer, a polyethylene terephthalate (PET), and a nylon (Ny) layer. The thickness measurement system 10 according to the present invention can measure the thickness of the entire pouch as a whole multi-layer structure, or can measure the thickness of only one layer within the multi-layer structure. For example, the thickness can be measured only for the aluminum layer within the pouch layer. The light L used in the thickness measurement can be laser or infrared light, and light L having various wavelengths can be used as needed. The placement portion 110 can be the portion where the target object pouch P is placed. The pouch can be provided with a cup-shaped portion that houses the electrode assembly. In order to accommodate the bag formed into a cup-shaped portion, the seating portion 110 may be provided with a groove. The groove may have a shape corresponding to the cup-shaped portion of the bag.

[0054] The moving unit 120 can be configured to move the mounting unit 110. The moving unit 120 can move the mounting unit 110 in a straight line. The positioning unit 110 can be moved in a straight line to a position for measuring thickness. To measure thickness, a displacement sensor is positioned on one side of the target object (or bag) P and a displacement sensor is positioned on the other side. The moving unit 120 can allow the mounting unit 110 to be positioned between the two displacement sensors.

[0055] The displacement sensor device 200 may be a device for measuring the thickness of the target object P. The displacement sensor device 200 may measure the thickness of the target object P using light L. The displacement sensor device 200 may include a first displacement sensor 210 and a second displacement sensor 220. The first displacement sensor 210 may be a sensor disposed on one side of the target object P to measure the distance to the target object P. The second displacement sensor 220 may be a sensor disposed on the other side of the target object P to measure the distance to the target object P. Figure 4 , first displacement sensor 210 can be positioned above the bag cup portion of target object P, while second displacement sensor 220 can be positioned below the bag cup portion. Furthermore, first displacement sensor 210 can irradiate light L onto the top surface of the bag cup portion, while second displacement sensor 220 can irradiate light L onto the bottom surface of the bag cup portion. To this end, moving unit 120 can move target bag P so that bag P is positioned between first displacement sensor 210 and second displacement sensor 220.

[0056] In particular, the first displacement sensor 210 and the second displacement sensor 220 may be respectively disposed on one side and the other side of the curved surface of the bag (object) P to measure the thickness of a portion of the curved surface. Figure 4 First displacement sensor 210 and second displacement sensor 220 can measure the thickness of the corner at a position corresponding to vertex C of the cup-shaped portion of the bag. To this end, mounting portion 110 can be tilted so that mounting portion 110 has a certain inclination. Alternatively, mounting portion 110 can move bag P to a position where a virtual straight line connecting first displacement sensor 210 and second displacement sensor 220 passes through the bag corner.

[0057] Each of the first and second displacement sensors 210 and 220 can emit light L. This emitted light L strikes the surface of the bag (object) P and returns to each displacement sensor. During this process, the distance between each displacement sensor and the bag surface is measured. In other words, the distance between the first and second displacement sensors 210 and the bag can be determined.

[0058] The processing device (not shown) may be a device that obtains a thickness value of the object P based on the measurement values ​​of the first displacement sensor 210 and the second displacement sensor 220. Since the distance between the first displacement sensor 210 and the second displacement sensor 220 is a known value, the processing device can obtain the thickness measurement value of the object P by sequentially subtracting the distance from the first displacement sensor 210 to the bag and the distance from the second displacement sensor 220 to the bag from the distance between the two sensors.

[0059] In addition, refer to Figures 5 to 7In the thickness measurement system 10 according to Embodiment 1 of the present invention, the displacement sensor device 200 may measure the thickness only when the incident angle θ between the light L emitted by the first displacement sensor 210 or the second displacement sensor 220 and the normal V perpendicular to the surface of the target object P as the target object to be measured is within a predetermined angle, and the displacement sensor device 200 may not measure the thickness when the incident angle θ is outside the predetermined angle.

[0060] refer to Figure 5 At least one of the first displacement sensor 210 or the second displacement sensor may include a light receiving lens 211 and a sensor body 212. The light receiving lens 211 may be a lens that receives reflected light L reflected from the target object P. The light receiving lens 211 may be mounted on a lower portion of the sensor body 212, and the sensor body 212 may be a portion into which the light L passing through the light receiving lens 211 is incident. The sensor body 212 may have a cylindrical shape.

[0061] When the incident angle θ is within a predetermined angle, the reflected light L may be incident into the light receiving lens 211 and the sensor body 212. Here, the predetermined angle may have a value between 0° and 1° (degree). Figure 5 The case where the incident angle is 0 degrees is shown. Therefore, in this case, light L emitted from the first displacement sensor 210 collides with the surface of the target object P and is then reflected and returned to the light receiving lens 211. The light L then passes through the light receiving lens 211 and returns to the sensor body 212. In this case, the distance value between the first displacement sensor 210 and the surface of the target object P can be measured.

[0062] Reference Figure 6 In the thickness measurement system 10 according to Example 1 of the present invention, when the incident angle θ is 0 degrees or within a predetermined angle, light L emitted from the first displacement sensor 210 can collide with the top surface of the target object P and then be reflected to return to the light receiving lens 211 and the sensor body 212. In addition, light L emitted from the second displacement sensor 220 can collide with the bottom surface of the target object P and then be reflected to return to the light receiving lens 211 and the sensor body 212. In this case, the thickness t of the bag can be measured without error. Here, measuring without error can mean accurate measurement that reaches the level required by the industry. An interferometric sensor can be used as an example of the displacement sensor used in this article.

[0063] Reference Figure 7In the thickness measurement system 10 according to Embodiment 1 of the present invention, when the incident angle θ is greater than a predetermined angle, that is, when the incident angle is outside the predetermined angle, the reflected light L may not be incident on the light receiving lens 211 and the sensor body 212. The light L emitted from the first displacement sensor 210 may collide with the top surface of the target object P and then be reflected without returning to the light receiving lens 211 and the sensor body 212. The light L emitted from the second displacement sensor 220 may collide with the bottom surface of the target object P and then be reflected without returning to the light receiving lens 211 and the sensor body 212. In this case, a measurement value may not be obtained from at least one of the first displacement sensor 210 or the second displacement sensor 220.

[0064] Even in this case, if measurement values ​​are obtained from first displacement sensor 210 and second displacement sensor 220, an inaccurate value t' will be measured, which contains an error. Here, the value t' is measured as t / cosθ, as described above, which is a value greater than the actual thickness t of the bag. However, in this inaccurate situation, thickness measurement system 10 according to Example 1 of the present invention does not generate a measurement value. Based on this principle, thickness measurement system 10 according to Example 1 of the present invention can eliminate the error.

[0065] The predetermined angle can be changed according to the diameter of the light receiving lens 211. When the diameter of the light receiving lens 211 is large, the predetermined angle can be increased, and when the diameter of the light receiving lens 211 is small, the predetermined angle can be decreased. In the thickness measurement system 10 according to Example 1 of the present invention, the predetermined angle can have a value between 0° and 1° (degrees), so that the thickness value of the bag can be measured while significantly eliminating errors.

[0066] According to this principle, the processing device may obtain the thickness value of the target object P only when the incident angle is within a predetermined angle, and may not obtain the thickness value of the target object P when the incident angle is outside the predetermined angle.

[0067] As described above, when measuring the thickness of a bag, the thickness measurement system 10 of the present invention can significantly reduce the measurement error caused by the positional relationship between the target object P to be measured and the sensor, especially significantly reduce the thickness measurement error of the corner of the bag set with a curved surface having various curvatures.

[0068] Reference Figure 3The thickness measurement system 10 according to Embodiment 1 of the present invention may further include a sensor gauge 400. At least one of the first displacement sensor 210 or the second displacement sensor 220 may be movable upward or downward. More specifically, the sensor gauge may include an upper sensor gauge 410 and a lower sensor gauge 420. The upper sensor gauge 410 may vertically move the first displacement sensor 210. Furthermore, the lower sensor gauge 420 may vertically move the second displacement sensor 220.

[0069] Reference Figure 3 In the thickness measurement system 10 according to Example 1 of the present invention, the moving portion 120 may further include a linear moving portion 121. The linear moving portion 121 may be configured to move the mounting portion 110 in the x-, y-, and z-axis directions, which are three axes orthogonal to each other in three-dimensional space. Furthermore, the moving portion 120 may include a posture control plate 123. Here, the posture control plate 123 may be configured such that one side is connected to the mounting portion 110 and the other side extends away from the displacement sensor device 200. The linear moving portion 121 may be connected to the posture control plate 123 to move the posture control plate 123 in the x-, y-, and z-axis directions, thereby moving the mounting portion 110 in the x-, y-, and z-axis directions. The posture control plate 123 may be configured to move the mounting portion 110 while stably supporting the mounting portion 110. Furthermore, the point where the mounting portion 110 is mounted and the component that moves the mounting portion 110 may be configured to be spaced apart by a predetermined distance. Therefore, the position where the setting portion is set can be sufficiently ensured.

[0070] Specifically, the linear motion section 121 may include a support portion 124, an x-axis gauge 121-1, a y-axis gauge 121-2, and a z-axis gauge 121-3. The support portion 124 may be connected to the other side of the posture control board 123 to support the other side. The x-axis gauge 121-1 may have a screw structure and may be a gauge configured to move the support portion 124 toward the x-axis. The y-axis gauge 121-2 may have a screw structure and may be a gauge configured to move the support portion 124 toward the y-axis. Furthermore, the z-axis gauge 121-3 may have a screw structure and may be a gauge configured to move the support portion 124 toward the z-axis.

[0071] When the x-axis gauge 121 - 1 moves the support portion 124 along the x-axis, the support portion 124 may move the posture control plate 123 connected thereto along the x-axis, and thus the mounting portion 110 mounted on the posture control plate 123 may move along the x-axis.

[0072] In this way, when the y-axis gauge 121-2 moves the support portion 124 along the y-axis, the support portion 124 can move the posture control plate 123 connected to the support portion 124 along the y-axis, and therefore, the mounting portion 110 mounted on the posture control plate 123 can move along the y-axis.

[0073] The z-axis gauge 121-3 can also operate in the same manner. When the z-axis gauge 121-3 moves the support portion 124 along the z-axis, the support portion 124 can move the posture control board 123 connected to the support portion 124 along the z-axis, thereby allowing the mounting portion 110 mounted on the posture control board 123 to move along the z-axis.

[0074] Through the x-axis gauge 121 - 1 , the y-axis gauge 121 - 2 , and the z-axis gauge 121 - 3 , the light L emitted from the displacement sensor can be adjusted to be accurately incident on the corner of the bag.

[0075] Figure 8 (a) is a perspective view showing a state in which the moving portion 120 moves the mounting portion 110 along the x-axis. Figure 8 (b) is a conceptual diagram illustrating a process of searching for the position of the bag corner when the mounting portion 110 moves along the x-axis.

[0076] exist Figure 8 In (a), the state where the mounting portion 110 moves in the F and B directions along the x-axis is shown. In this case, the light L emitted from the first displacement sensor 210 can draw a trace on the surface of the bag. Figure 8 In (a) and (b) of FIG. 1 , an x-axis light irradiation line drawn by the light L emitted from the first displacement sensor 210 on the surface of the bag as the target object P is shown as XL. Figure 8 (b) As the receiving portion 110 moves along the x-axis, the displacement measured by the first displacement sensor 210 gradually increases, changing from L1 to L2. Furthermore, once the first displacement sensor 210 passes L2, the displacement measured by the first displacement sensor 210 gradually decreases. In this case, the x-axis position of the bag corner C where the maximum displacement occurs (i.e., when the distance from the first displacement sensor 210 to the bag surface is the greatest) can be determined. Therefore, the x-axis gauge 121-1 can be adjusted so that the receiving portion 110 stops at the maximum displacement.

[0077] Figure 9 (a) is a perspective view showing a state in which the moving portion moves the placement portion along the y-axis. Figure 9 (b) is a conceptual diagram illustrating a process of searching for the position of the bag corner when the mounting portion 110 moves along the y-axis.

[0078] exist Figure 9In (a), the state where the mounting portion 110 moves in the L and R directions along the y-axis is shown. In this case, the light L emitted from the first displacement sensor 210 can draw a trace on the surface of the bag. Figure 9 In (a) and (b) of FIG. 1 , a y-axis light irradiation line drawn by the light L emitted from the first displacement sensor 210 on the surface of the bag as the target object P is shown as YL. Figure 9 In (b), as the receiving portion 110 moves along the y-axis, the displacement measured by the first displacement sensor 210 gradually increases, changing from S1 to S2. Furthermore, once the first displacement sensor 210 passes L2, the displacement measured by the first displacement sensor 210 gradually decreases. In this case, the y-axis position of the bag corner where the maximum displacement occurs (i.e., when the distance from the first displacement sensor 210 to the bag surface is the greatest) can be determined. Therefore, the y-axis gauge 121-2 can be adjusted so that the receiving portion 110 stops at the maximum displacement.

[0079] In the case of the z-axis gauge 121 - 3 , the bag object P placed on the seating portion 110 may be adjusted to be disposed between the first displacement sensor 210 and the second displacement sensor 220 .

[0080] Example 2

[0081] Figure 10 is a perspective view of a thickness measurement system 10 according to Embodiment 2 of the present invention. Figure 11 1 is a perspective view showing a state in which the rotational moving portion 122 is viewed from the lower side of the posture control plate 123 of the thickness measurement system 10 according to the second embodiment of the present invention. Figure 12 1 is a conceptual diagram illustrating the principle of measuring the thickness of a bag corner when the rotational movement unit 122 rotationally moves the mounting unit 110 .

[0082] The difference between the second embodiment of the present invention and the first embodiment is that the thickness measurement system 10 includes a rotational moving part 122 .

[0083] When describing the second embodiment, the same contents as those in the first embodiment will be omitted as much as possible, and the focus will be on the differences. That is, it is obvious that if there is a need for a content not described in the second embodiment, it can be regarded as the content of the first embodiment.

[0084] Reference Figure 10In the thickness measurement system 10 according to Example 2 of the present invention, the moving unit 120 may include a rotational moving unit 122 that rotates the mounting unit 110 in three-dimensional space. Furthermore, the moving unit 120 may further include a posture control plate 123. The posture control plate 123 may have one side connected to the mounting unit 110 and the other side extending in a direction away from the displacement sensor device 200. Here, the rotational moving unit 122 may be connected to the posture control plate 123 so as to rotate and move the mounting unit 110.

[0085] Specifically, refer to Figure 10 and Figure 11 The rotation moving portion 122 may include a support portion 124 , a first gauge 122 - 1 , and a second gauge 122 - 2 .

[0086] The support column 124 may be connected to the other side of the posture control plate 123 to support the other side, and the top surface of the support column 124 facing the posture control plate 123 may have a square shape. The support column 124 may have a square pillar shape with a square top surface.

[0087] The first gauge 122-1 may be mounted on the support column 124 and may be configured to move the posture control plate 123 upward or downward at a point corresponding to one corner of the square. In this case, the posture control plate 123 may be moved upward or downward using a screw principle.

[0088] refer to Figure 10 and Figure 11 , the first gauge 122-1 may be provided at point I of the posture control plate 123. Point I may be a portion of the posture control plate 123 corresponding to one corner of a square portion of the top surface corresponding to the support column 124. Furthermore, the first gauge 122-1 is connected to point I. The first gauge 122-1 may have a screw shape on its outer surface and be mounted on the support column 124.

[0089] Furthermore, when the first gauge 122-1 rotates in one direction H1, it can push point I of the gesture control plate 123 upward U1. Conversely, when the first gauge 122-1 rotates in a direction G1 opposite to the one direction, it can lower point I of the gesture control plate 123 downward D1. In this way, the first gauge 122-1 can rotate the gesture control plate 123. In other words, the gesture control plate 123 can be fixed at point J. However, the gesture control plate 123 can be operated by simply lifting point I, thereby allowing the gesture control plate 123 to rotate.

[0090] When the posture control plate 123 rotates, the receiving portion 110 mounted on the posture control plate 123 may also rotate. When the receiving portion 110 rotates, the bag object P may also rotate.

[0091] The second gauge 122 - 2 may be mounted on the support column portion 124 and may be configured to move the posture control plate 123 upward or downward at a point corresponding to a corner opposite to a position where the first gauge 122 - 1 is mounted in the square shape.

[0092] refer to Figure 10 and Figure 11 , the second gauge 122-2 may be provided at point J of the posture control plate 123. Point J may be a portion of the posture control plate 123 corresponding to another corner in the square portion corresponding to the top surface of the support column 124. Furthermore, the second gauge 122-2 is connected to point J. The second gauge 122-2 may have a screw shape on its outer surface and be mounted on the support column 124.

[0093] Furthermore, when the second gauge 122-2 rotates in one direction H2, it can push point J of the posture control plate 123 upward U2. Conversely, when the second gauge 122-2 rotates in a direction G2 opposite to the one direction, it can allow point J of the posture control plate 123 to drop downward D2. In this way, the second gauge 122-2 can rotate the posture control plate 123. When the posture control plate 123 rotates, the receiving portion 110 mounted on the posture control plate 123 can also rotate. When the receiving portion 110 rotates, the bag object P can also rotate.

[0094] Figure 12 (a) and (b) show a state in which the light L emitted from the first displacement sensor 210 is reflected from the bag surface PL when the first gauge 122 - 1 or the second gauge 122 - 2 rotates and moves the mounting portion 110 . Figure 12 (a) shows a state in which the light L emitted from the first displacement sensor 210 is reflected from the bag surface PL and then is no longer received.

[0095] In this state, when the first gauge 122-1 or the second gauge 122-2 rotates the target object P, it can be in Figure 12 (b) In this case, the incident angle θ of light L emitted from first displacement sensor 210 can be within a predetermined angle. Therefore, light L reflected from bag surface PL can be received by light-receiving lens 211 and then received by sensor body 212. In this case, a sufficiently accurate thickness measurement value can be measured without error. If an error exists, the thickness measurement value may not be measured, thereby removing the erroneous thickness measurement value.

[0096] As described above, when measuring the thickness of a bag, the thickness measurement system of the present invention can significantly reduce the measurement error caused by the positional relationship between the target object to be measured and the sensor, especially significantly reduce the thickness measurement error of the corner of the bag set with a curved surface having various curvatures.

[0097] While embodiments of the present invention have been described with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention as defined in the following claims.

[0098] [Symbol description]

[0099] 10: Thickness measurement system

[0100] 100: devices

[0101] 110: Placement Department

[0102] 120: Mobile Department

[0103] 121: Linear motion unit

[0104] 121-1: x-axis gauge

[0105] 121-2: Y-axis gauge

[0106] 121-3: z-axis gauge

[0107] 122: Rotational movement unit

[0108] 122-1: First Gauge

[0109] 122-2: Second Gauge

[0110] 123: Posture Control Panel

[0111] 124: Pillar part

[0112] 200: Displacement sensor device

[0113] 210: First displacement sensor

[0114] 211: Light receiving lens

[0115] 212: Sensor body

[0116] 220: Second displacement sensor

[0117] L: Light

[0118] P: Target

[0119] XL: X-axis irradiation line on the target surface

[0120] YL: Y-axis irradiation line on the target surface

[0121] PL: Bag surface

Claims

1. A thickness measurement system comprising: a stage device, the stage device comprising a placing portion and a moving portion, the placing portion having a target object to be measured for thickness placed thereon, the moving portion being configured to move the placing portion; a displacement sensor device, the displacement sensor device comprising a first displacement sensor and a second displacement sensor, the first displacement sensor being disposed on one side of the target to measure the distance to the target, and the second displacement sensor being disposed on the other side of the target to measure the distance to the target; as well as a processing device configured to obtain a thickness value of the target object based on measurement values ​​of the first displacement sensor and the second displacement sensor, The displacement sensor device performs measurement only when an incident angle is within a predetermined angle, and does not perform measurement when the incident angle is outside the predetermined angle, wherein the incident angle is an angle between light emitted by the first displacement sensor or the second displacement sensor and a normal perpendicular to a surface of the target object to be measured.

2. The thickness measurement system according to claim 1, wherein: The first displacement sensor and the second displacement sensor are respectively disposed on one side and the other side of the curved surface of the target object to perform measurement at a point on the curved surface.

3. The thickness measurement system according to claim 1, wherein: At least one of the first displacement sensor or the second displacement sensor comprises: a light-receiving lens configured to receive reflected light reflected from a surface of the target object; and a sensor body on which the light receiving lens is mounted, and into which light passing through the light receiving lens is incident, wherein, when the incident angle is within the predetermined angle, the reflected light is incident on the light receiving lens and the sensor body, When the incident angle is outside the predetermined angle, the reflected light is not incident on the light receiving lens and the sensor body.

4. The thickness measurement system according to claim 3, wherein: The predetermined angle becomes smaller as the diameter of the light-receiving lens decreases.

5. The thickness measurement system according to claim 4, wherein: The predetermined angle has a value between 0° and 1° (degrees).

6. The thickness measurement system according to claim 1, wherein: The processing device obtains the thickness value of the target object only when the incident angle is within the predetermined angle, and does not obtain the thickness value of the target object when the incident angle is outside the predetermined angle. 7 . The thickness measurement system of claim 1 , further comprising a sensor gauge configured to move at least one of the first displacement sensor or the second displacement sensor upward or downward.

8. The thickness measurement system according to claim 1, wherein: The moving portion includes a linear moving portion configured to move the mounting portion in x-axis, y-axis, and z-axis directions, which are three axes orthogonal to each other in a three-dimensional space.

9. The thickness measurement system according to claim 8, wherein: The moving portion includes a posture control plate having one side connected to the mounting portion and the other side extending in a direction away from the displacement sensor device. The linear moving portion is connected to the posture control plate to move the posture control plate in the x-axis, y-axis, and z-axis directions so that the mounting portion moves in the x-axis, y-axis, and z-axis directions.

10. The thickness measurement system according to claim 9, wherein: The linear moving portion includes: a support portion connected to the other side of the posture control board to support the other side; an x-axis gauge having a screw structure and configured to move the support portion toward the x-axis; a y-axis gauge having a screw structure and configured to move the support portion toward the y-axis; and A z-axis gauge has a screw structure and is configured to move the support portion toward the z-axis.

11. The thickness measurement system according to any one of claims 1 or 8, wherein: The moving portion includes a rotation-movement portion configured to rotate and move the mounting portion in a three-dimensional space.

12. The thickness measurement system according to claim 11, wherein: The moving portion includes a posture control plate having one side connected to the mounting portion and the other side extending in a direction away from the displacement sensor device. The rotational movement portion is connected to the posture control plate to rotate and move the mounting portion when the posture control plate rotates and moves.

13. The thickness measurement system according to claim 12, wherein: The rotational movement portion includes: a support portion connected to the other side of the posture control board to support the other side and having a square top surface facing the posture control board; a first gauge mounted on the support column portion and configured to move the gesture control plate upward or downward at a point corresponding to one corner of a square; and A second gauge is mounted on the support column portion and is configured to move the posture control plate upward or downward at a point corresponding to a corner of the square opposite to the position where the first gauge is mounted.

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