Molding condition adjustment device and molding condition adjustment method

Abstract

To mold a transparent body that is in a desired state segment.SOLUTION: A molding condition adjustment device 3 is configured to adjust a molding condition of a sheet-like or tubular transparent body 9 in a molding device 2. The molding condition adjustment device 3 comprises: a phase difference acquisition unit 4 that acquires a phase difference occurring in the transparent body 9 molded by the molding device 2; and an adjustment information acquisition unit 5 that, with a plurality of state segments indicative of a state of the transparent body 9 set based on the phase difference, stores adjustment information on a molding condition for changing the transparent body 9 to be molded by the molding device 2 from one state segment to another state segment, and acquires the adjustment information on the molding condition for changing the transparent body 9 to be molded by the molding device 2 to a desired state segment on the basis of the phase difference acquired by the phase difference acquisition unit 4 with respect to the molded transparent body 9. Thus, the transparent body 9 in the desired state segment can be stably molded.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a technique for adjusting molding conditions for a transparent body in a molding device. [Background technology]

[0002] Conventionally, there are known techniques for forming (manufacturing) sheet- or plate-shaped transparent bodies. In addition, in a manufacturing line for transparent bodies, optical defects of the transparent bodies are also inspected (see, for example, Patent Documents 1 and 2). Patent Document 3 discloses a device for measuring the phase difference and principal axis orientation of a transparent film. The device includes a surface-emitting light source that inputs circularly polarized light or a known elliptically polarized light to the surface of the transparent film, and a polarization state measuring means that simultaneously measures the polarization state of light transmitted through the surface of the transparent film at multiple measurement points. The polarization state measuring means includes a polarizer patterned so that the direction of transmitted polarization differs for each region, and a light receiving element that can independently receive the intensity of light that has passed through each region. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-236826 A [Patent Document 2] JP 2012-137502 A [Patent Document 3] JP 2007-263593 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, when a transparent body is molded in a molding device, it is possible to divide the state of the molded transparent body into a plurality of sections (state sections) based on the phase difference that occurs in the molded transparent body. On the other hand, in the molding device, the state section of the molded transparent body may change unintentionally, and in this case, it is necessary to adjust the molding conditions to return the state section of the molded transparent body to the desired state section. However, such adjustment of the molding conditions is not easy, and it is difficult to stably mold a transparent body in the desired state section.

[0005] The present invention has been made in consideration of the above problems, and has as its object to stably mold a transparent body having a desired state division. [Means for solving the problem]

[0006] The invention described in claim 1 is a molding condition adjustment device that adjusts the molding conditions for a sheet-shaped or plate-shaped transparent body in a molding device, and includes a phase difference acquisition unit that acquires the phase difference generated in a transparent body molded by the molding device, and a plurality of state classifications indicating the state of the transparent body are set based on the phase difference, and an adjustment information acquisition unit that stores adjustment information for molding conditions for changing the transparent body molded by the molding device from one state classification to another state classification, and acquires adjustment information for molding conditions for changing the transparent body molded by the molding device to a desired state classification based on the phase difference acquired by the phase difference acquisition unit for the molded transparent body, and the plurality of state classifications are a plurality of ranges obtained by dividing the entire range in which the phase difference average can be taken. The invention described in claim 2 is The method according to claim 1 A molding condition adjustment device ,before The adjustment information acquisition unit specifies the most prevalent state category among the state categories for the multiple portions of the already-molded transparent body as the state category of the transparent body currently being molded by the molding device.

[0007] Claim 3 The invention described in claim 1 OR 2In the molding condition adjustment device according to the above, the phase difference acquisition unit acquires a phase difference image indicating a phase difference at each position of a target area in the molded transparent body.

[0008] Claim 4 The invention described in claim 3 The molding condition adjustment device described in the above, wherein the molding device molds a transparent body which is a continuous sheet, the phase difference acquisition unit acquires a plurality of phase difference images at a plurality of locations of the transparent body, and the adjustment information acquisition unit acquires adjustment information of the molding conditions based on the plurality of phase difference images.

[0009] Claim 5 The invention described in claim 3 or 4 2. The molding condition adjustment device described in , wherein the phase difference acquisition unit comprises an illumination unit that irradiates polarized light onto the target area of ​​the molded transparent body, a measurement unit that acquires the phase difference generated at each position of the target area by measuring the polarization state of transmitted light that has passed through each position, and a phase difference generation unit that is disposed between the molded transparent body and the measurement unit and generates a predetermined phase difference partially in the light that has passed through the target area, and the molded transparent body moves relative to the phase difference acquisition unit, and a phase difference used by the adjustment information acquisition unit is acquired for one position of the target area based on the phase difference acquired by the phase difference acquisition unit in a state where the predetermined phase difference is generated by the phase difference generation unit and the phase difference acquired by the phase difference acquisition unit in a state where the predetermined phase difference is not generated by the phase difference generation unit.

[0010] Claim 6 The invention described in claim 3 or 4the phase difference acquisition unit includes an illumination unit that irradiates polarized light onto the target area of ​​the molded transparent body, a measurement unit that acquires the phase difference generated at each position of the target area by measuring the polarization state of transmitted light that has passed through each position, a phase difference generation unit that generates a predetermined phase difference in the transmitted light, and a switching mechanism that selectively positions the phase difference generation unit at a first position between the molded transparent body and the measurement unit, and a second position away from the first position, and a phase difference image used by the adjustment information acquisition unit is acquired based on a phase difference image acquired by the phase difference acquisition unit when the phase difference generation unit is positioned at the first position and a phase difference image acquired by the phase difference acquisition unit when the phase difference generation unit is positioned at the second position.

[0011] Claim 7 The invention described in claims 1 to 6 13. The molding condition adjusting device according to claim 12, wherein the molding device molds a transparent body that is a continuous sheet, and the molding conditions include a rotation speed of at least one molding roll.

[0012] The invention described in claim 8 is a molding condition adjustment method for adjusting the molding conditions of a sheet-shaped or plate-shaped transparent body in a molding device, comprising: a) a step of acquiring a phase difference generated in a transparent body molded by the molding device using a phase difference acquisition unit; and b) a plurality of state divisions indicating the state of the transparent body are set based on the phase difference, and adjustment information of the molding conditions for changing the transparent body molded by the molding device from one state division to another state division is stored in the adjustment information acquisition unit, and a step of acquiring, by the adjustment information acquisition unit, adjustment information of the molding conditions for changing the transparent body molded by the molding device to a desired state division based on the phase difference acquired in step a), wherein the plurality of state divisions are a plurality of ranges obtained by dividing the entire range in which the phase difference average can be taken. The invention described in claim 9 is The method according to claim 8 A molding condition adjustment method ,beforeThe state class that is most prevalent among the state classes for the multiple portions of the molded transparent body is identified in step b) as the state class of the transparent body currently being molded by the molding device.

[0013] Claim 10 The invention described in claim 8 or 9 The molding condition adjustment method described in the above, in which a trained model is generated by learning using a plurality of training data, using a combination of change information for molding conditions in molding a transparent body and two state categories before and after the molding conditions are changed to match the change information, and the adjustment information acquisition unit includes the trained model. Effect of the Invention

[0014] According to the present invention, a transparent body having a desired state division can be stably molded. [Brief description of the drawings]

[0015] [Figure 1] 1 is a diagram showing a configuration of a molding system according to a first embodiment. [Diagram 2] FIG. [Figure 3A] FIG. 2 is a diagram illustrating a schematic configuration of a measurement unit. [Figure 3B] FIG. 2 illustrates a group of polarizers. [Figure 3C] FIG. 2 is a diagram illustrating pixels of an imaging element. [Figure 4A] FIG. 2 is a diagram for explaining a bank. [Figure 4B] FIG. 2 is a diagram for explaining a bank. [Diagram 5] FIG. 13 is a diagram showing changes in average phase difference of a transparent body. [Figure 6] FIG. 13 is a diagram showing values ​​of molding parameters and phase contrast images during a plurality of condition fixing periods. [Figure 7] 11 is a diagram showing a process flow for adjusting molding conditions of a transparent body in a molding device. FIG. [Figure 8]FIG. 13 is a diagram for explaining acquisition of a plurality of phase contrast images. [Figure 9] 5 is a diagram for explaining a range of phase difference that can be measured by a measurement unit. FIG. [Figure 10] FIG. 13 is a diagram illustrating another example of the phase difference acquisition unit. [Figure 11A] FIG. 13 is a diagram showing a principal axis orientation image. [Figure 11B] FIG. 13 is a diagram showing a principal axis orientation image. [Figure 12] FIG. 13 is a diagram showing a phase contrast image. [Figure 13A] FIG. 13 is a diagram showing a phase contrast image. [Figure 13B] FIG. 13 is a diagram showing a phase contrast image. [Figure 14] FIG. 13 is a diagram showing the relationship between density and phase difference in a phase difference image. [Figure 15] FIG. 13 is a diagram showing a configuration of a molding system according to a second embodiment. [Figure 16] FIG. 13 is a diagram showing phase contrast images at a plurality of roll temperatures. [Figure 17] FIG. 13 is a diagram showing phase contrast images at a plurality of stretching ratios. [Figure 18] FIG. 13 is a diagram illustrating another example of the phase difference acquisition unit. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Fig. 1 is a diagram showing a configuration of a molding system 1 according to a first embodiment of the present invention. The molding system 1 includes a molding device 2 and a molding condition adjustment device 3. The molding device 2 is a device that molds a sheet-like transparent body 9, and in the example of Fig. 1, the molding device 2 molds the transparent body 9, which is a continuous sheet, by extrusion molding. As will be described later, the molding device 2 may be a device that molds the transparent body 9 by other molding methods such as stretch molding.

[0017] Fig. 2 is a diagram showing a part of the molding apparatus 2. As shown in Fig. 1 and Fig. 2, the molding apparatus 2 includes a control unit 20, an extruder 21, a die 22, a first forming roll 231, a second forming roll 232, a third forming roll 233, a first conveying roll 241, and a second conveying roll 242. The control unit 20 is responsible for the overall control of the molding apparatus 2.

[0018] The extruder 21 includes a cylinder 211 and a screw 212 provided in the cylinder. The cylinder 211 is filled with molten resin, and the resin in the cylinder 211 is supplied to the inside of the die 22 by the rotation of the screw 212 by a motor or the like. The die 22 is a metal mold for molding the resin, and has a linear lip 221 extending in a substantially horizontal direction at its tip. In the example of FIG. 2, the lip 221 opens vertically downward. The resin supplied to the inside of the die 22 is extruded from the lip 221 in a sheet shape (film shape). The sheet-shaped resin is cooled while being molded by the first to third molding rolls 231 to 233, and becomes a sheet-shaped transparent body 9. In the following description, the transparent body 9 being molded by the first to third molding rolls 231 to 233 will also be simply called the "transparent body 9." The width direction of the transparent body 9 in the molding device 2 coincides with the longitudinal direction of the lip 221 (the direction perpendicular to the paper surface of FIG. 2), and will hereinafter be simply referred to as the "width direction."

[0019] The first to third forming rolls 231 to 233 have a rotation axis parallel to the width direction, and are arranged in order, for example, in a substantially horizontal direction perpendicular to the width direction. In the example of FIG. 2, the first forming roll 231, the second forming roll 232, and the third forming roll 233 are arranged in order from the left to the right (in the direction away from the extruder 21). The first to third forming rolls 231 to 233 are connected to a motor not shown. The first and third forming rolls 231 and 233 in FIG. 2 rotate clockwise, and the second forming roll 232 rotates counterclockwise. The rotation speeds of the first to third forming rolls 231 to 233 can be changed individually. A transparent body 9 is sandwiched between the first forming roll 231 and the second forming roll 232, and between the second forming roll 232 and the third forming roll 233. The temperatures of the outer circumferential surfaces of the first to third forming rolls 231 to 233 can be changed individually by an internal heater or the like. In the molding device 2, the transparent body 9 passes through the first to third molding rolls 231 to 233, thereby completing the molding of the transparent body 9. The transparent body 9 that has passed through the first to third molding rolls 231 to 233 becomes a molded transparent body 9. In the molding device 2, the transparent body 9 is molded continuously at a substantially constant speed.

[0020] The first and second transport rolls 241, 242 shown in FIG. 1 have a rotation axis parallel to the width direction, and are arranged in order, for example, in a substantially horizontal direction perpendicular to the width direction. In the example of FIG. 1, the first transport roll 241 and the second transport roll 242 are arranged in order from left to right (in the direction away from the extruder 21). Each of the first and second transport rolls 241, 242 is, for example, a nip roll, and supports the transparent body 9 while transporting it at a constant speed. Each of the transport rolls 241, 242 may be a single roll. The first transport roll 241 and the second transport roll 242 are separated by a predetermined distance, and the transparent body 9 does not come into contact with any member between the first transport roll 241 and the second transport roll 242.

[0021] The molding condition adjustment device 3 is a device that adjusts the molding conditions of the transparent body 9 in the molding device 2. The molding condition adjustment device 3 includes a phase difference acquisition unit 4 and an adjustment information acquisition unit 5. The phase difference acquisition unit 4 includes an illumination unit 41 and a measurement unit 42. Between the first transport roll 241 and the second transport roll 242, the illumination unit 41 is disposed at a position facing one side of the transparent body 9, and the measurement unit 42 is disposed at a position facing the other side. The illumination unit 41 has, for example, a light source and a wavelength plate, and irradiates light of a predetermined polarization state (i.e., polarized light) toward the transparent body 9. In this embodiment, the polarized light is circularly polarized light, but may be elliptically polarized light or the like. In the following description, the area of ​​the transparent body 9 irradiated with polarized light by the illumination unit 41 during measurement by the phase difference acquisition unit 4 is called a "target area".

[0022] FIG. 3A is a diagram showing a schematic configuration of the measurement unit 42. FIG. 3B is a diagram showing one polarizer group 431, and FIG. 3C is a diagram showing a pixel 442 of the image sensor 44 corresponding to the polarizer group 431. The measurement unit 42 is a polarization camera, and obtains a phase difference occurring at each position by measuring the polarization state of light (hereinafter referred to as "transmitted light") emitted from the illumination unit 41 and transmitted through each position in the target area. The measurement unit 42 in this embodiment has a configuration similar to that of the polarization state measurement means in, for example, JP 2007-263593 A (the above-mentioned Patent Document 3). That is, the measurement unit 42 in FIG. 3A includes a polarizer array 43 patterned so that the directions of the transmission axes are different in adjacent areas, and an image sensor 44 that obtains the intensity of light passing through each area of ​​the polarizer array 43 individually.

[0023] In detail, in the polarizer array 43, a polarizer group 431 (surrounded by a dashed rectangle in FIG. 3A and FIG. 3B) including two rows and two columns of polarizers 432 is provided for each position in the target area, and the orientation of the transmission axis of each of the four polarizers 432 in the polarizer group 431 differs by 45 degrees. The intensity of the light transmitted through each polarizer 432 in the polarizer group 431 is acquired by each pixel 442 of the image sensor 44. FIG. 3C shows four pixels 442 that receive the light transmitted through the four polarizers 432 in the polarizer group 431. An example of the intensity acquired by each pixel 442 is shown by shading. With the above configuration, the polarization state of the transmitted light transmitted through each position in the target area is measured, and the phase difference occurring at the position is acquired. In practice, the phase difference acquisition unit 4 generates a phase difference image indicating the phase difference at each position in the target area, and outputs it to the adjustment information acquisition unit 5. In addition, the measurement unit 42 can also generate a principal axis direction image (transmission axis direction image) that indicates the principal axis direction at each position in the target area. The arrangement of the polarizers 432 in the polarizer group 431 is not limited to 2 rows and 2 columns.

[0024] 1 is a function realized by a computer including a CPU, a memory, etc., executing a predetermined program. Details of the adjustment information acquisition unit 5 will be described later. All or part of the functions of the adjustment information acquisition unit 5 may be realized by an electric circuit.

[0025] Here, the molding conditions of the transparent body 9 in the molding device 2 will be described. The molding conditions of the transparent body 9 include a plurality of molding parameters. The molding parameters include, for example, the rotation speed of each of the molding rolls 231-233, the temperature of each of the molding rolls 231-233, the pressing (pressure) of the first molding roll 231, the air gap, and the bank. In this embodiment, the circumferential speed is used as the rotation speed of the molding rolls 231-233, but the rotation speed may be the number of rotations of the molding rolls 231-233, etc. Also, instead of the rotation speed of the first molding roll 231, the draw ratio of the first molding roll 231 may be used. The draw ratio of the first molding roll 231 is the ratio of increasing or decreasing the rotation speed of the first molding roll 231 with respect to the rotation speed of the second molding roll 232. For example, when the rotation speed of the second forming roll 232 is 10 m / min and the draw ratio of the first forming roll 231 is +0.1%, the rotation speed of the first forming roll 231 is 10.01 m / min, based on (10 [m / min] × 1.001). The draw ratio may be used for the third forming roll 233 in a similar manner.

[0026] The temperatures of the forming rolls 231-233 are the temperatures of the outer peripheral surfaces of the forming rolls 231-233, and are hereinafter also referred to as "roll temperatures". The pressure of the first forming roll 231 is the pressure acting between the first forming roll 231 and the second forming roll 232, as shown by the arrow A1 in FIG. 2. The air gap is the vertical distance between the position where the first forming roll 231 and the second forming roll 232 are closest to each other and the lip 221 of the die 22, and the size of the air gap is shown by the arrow G1 in FIG. 2. As shown in FIG. 4A and FIG. 4B, the bank indicates which of the first forming roll 231 and the second forming roll 232 the resin (transparent body 9) discharged from the lip 221 will contact first. For example, a state where the resin discharged from the lip 221 contacts the second forming roll 232 first (the state in FIG. 4A) and a state where the resin discharged from the lip 221 contacts the first forming roll 232 first (the state in FIG. 4B) are distinguished. The molding parameters may further include the width of the gap of the lip 221 of the die 22, the temperature of the resin in the cylinder 211, and the like.

[0027] FIG. 5 is a diagram showing changes in the average phase difference of the transparent body 9. The vertical axis of FIG. 5 indicates the average phase difference of the transparent body 9, and the horizontal axis indicates time. The average phase difference is the average phase difference at all positions or in a predetermined range in one phase difference image, and indicates the average phase difference in the target area of ​​the transparent body 9 from which the phase difference image was acquired. Each of the periods T11 to T14 in FIG. 5 indicates a period in which the transparent body 9 was molded with constant values ​​of molding parameters (a period in which the molding conditions are constant, hereinafter referred to as a "fixed condition period"). In the multiple fixed condition periods T11 to T14, different molding conditions are used. As shown in FIG. 5, in the molding device 2, the average phase difference of the transparent body 9 changes by changing the molding conditions of the transparent body 9. In reality, even if the transparent body 9 is molded with constant molding conditions, the average phase difference may vary to some extent.

[0028] In molding the transparent body 9 in the molding device 2, the state of the molded transparent body 9 can be divided into a plurality of sections (hereinafter referred to as "state sections") based on the phase difference occurring in the molded transparent body 9. The plurality of state sections are, for example, a plurality of ranges obtained by dividing the entire range in which the phase difference average can be. The plurality of state sections may also include the presence or absence of streaks in the phase contrast image and the degree of unevenness (variation in phase difference) in the phase contrast image. The streaks are caused, for example, by minute scratches in the transparent body 9, and the unevenness is caused, for example, by distortion or unevenness in thickness of the transparent body 9.

[0029] Next, the adjustment information acquisition unit 5 in Fig. 1 will be described. In this embodiment, the adjustment information acquisition unit 5 includes an estimator 51 that is generated in advance. The estimator 51 utilizes a decision tree, a neural network, or the like. In the generation of the estimator 51, phase contrast images of the transparent body 9 are sequentially acquired while changing the values ​​of a plurality of molding parameters in the molding conditions. Here, a plurality of phase contrast images are acquired from the molded transparent body 9 during each period in which the transparent body 9 is molded under certain molding conditions, i.e., during each fixed condition period.

[0030] FIG. 6 is a diagram showing values ​​of molding parameters and phase difference images in a plurality of fixed condition periods. In FIG. 6, the "Sample No." column shows sample numbers of transparent bodies 9 molded in each fixed condition period. In the "Molding Speed" column, "R1", "R2", and "R3" show the rotation speeds of the first to third molding rolls 231 to 233, respectively. In the "Roll Temperature" column, "R1", "R2", and "R3" show the temperatures of the first to third molding rolls 231 to 233, respectively. In the "No. 1 Roll" column, "Pressure" shows the pressure (pressure) of the first molding roll 231, and "Linear Pressure" shows the force acting per unit length of the first molding roll 231. The "Air Gap" column shows the size of the air gap described above. The "Image Example" column shows an example of a phase difference image. In an actual phase difference image, the magnitude of the phase difference is shown by color, but in FIG. 6, the magnitude of the phase difference is shown by shading, and the brighter the image, the larger the phase difference.

[0031] Next, a phase difference average is calculated for each of the multiple phase difference images acquired during each fixed condition period. As described above, the phase difference average is the average value of phase differences at all positions or in a predetermined range in one phase difference image. Thereafter, an average value of the phase difference averages during each fixed condition period is calculated, and the state classification of the transparent body 9 formed during the fixed condition period is specified using the average value of the phase difference averages.

[0032] As described above, the state classification may include the presence or absence of streaks in a phase contrast image and the degree of unevenness (variation in phase difference) in the phase contrast image. When the presence or absence of streaks is included in the state classification, for example, a feature amount related to the presence of streaks is obtained by applying a predetermined filter process to the phase contrast image, and the degree of streaks is determined using the feature amount. When the degree of unevenness in the phase contrast image is included in the state classification, for example, the degree of unevenness is determined using an average value of phase difference standard deviations in each condition fixed period. The phase difference standard deviation is a standard deviation obtained from phase differences at all positions or in a predetermined range in one phase contrast image.

[0033] When the state classification of the transparent body 9 formed in each condition fixing period is identified, teacher data is acquired. The teacher data is a combination of the type of molding parameter whose value has been changed and the amount of change in the value of the molding parameter (hereinafter collectively referred to as "molding condition change information") when transitioning from one condition fixing period to the next condition fixing period, and the state classification of the transparent body 9 before and after the transition (i.e., two state classifications before and after the transition). In other words, the teacher data is a combination of molding condition change information in molding the transparent body 9 and two state classifications before and after the molding conditions are changed to match the change information (hereinafter simply referred to as "state classifications before and after change").

[0034] When a plurality of teacher data are prepared, the plurality of teacher data are input to the learning unit 6 of FIG. 1. The learning unit 6 may be realized by the same computer as the adjustment information acquisition unit 5, or may be realized by another computer. In the learning unit 6, learning is performed so that the output of the estimator for the input of the state classification before and after the change in each teacher data is approximately the same as the change information of the molding condition indicated by the teacher data, and an estimator 51, which is a trained model, is generated. In the generation of the estimator 51, for example, the value of the parameter included in the estimator 51 and the structure of the estimator 51 are determined. The generation of the estimator 51 may be performed by a well-known method. The estimator 51 (actually, the parameter value and the information indicating the structure of the estimator) are transferred to the adjustment information acquisition unit 5. In this way, the estimator 51 is introduced to the adjustment information acquisition unit 5. The estimator 51 outputs the change information of the molding condition for changing the transparent body 9 molded by the molding device 2 from one state classification to another state classification, so that the adjustment information acquisition unit 5 can be said to substantially store the information.

[0035] Next, a process flow in which the molding condition adjustment device 3 adjusts the molding conditions of the transparent body 9 in the molding device 2 will be described with reference to Fig. 7. When the molding condition adjustment device 3 adjusts the molding conditions, the above-mentioned estimator 51 is generated in advance and introduced into the adjustment information acquisition unit 5.

[0036] In the molding device 2, the transparent body 9 is continuously molded under the set molding conditions. At this time, even when the transparent body 9 is molded under the same molding conditions, the state classification of the molded transparent body 9 may unintentionally change. The reason why the state classification of the transparent body 9 changes is not clear, but possible reasons include changes in the ambient temperature and variations in mechanical adjustment by the operator (human factors). In the phase difference acquisition unit 4, phase difference images are acquired for the transparent body 9, for example, at regular intervals (step S11). As a result, as shown in FIG. 8, phase difference images are acquired sequentially for a plurality of parts (target areas) 91 in the transparent body 9 that are spaced apart by a regular interval. The phase difference images are output to the adjustment information acquisition unit 5. In FIG. 8, the gap between the parts 91 where the phase difference images are acquired is narrower than in reality. The phase difference images may be acquired at irregular intervals.

[0037] In the adjustment information acquisition unit 5, the state classification of the portion 91 from which the phase difference image was acquired is specified from each phase difference image. The state classification of each portion 91 is specified in the same manner as when the above-mentioned teacher data is acquired, and for example, the phase difference average is used. As described above, even in a transparent body 9 molded under certain molding conditions, the phase difference average fluctuates to some extent, so that the state classifications specified for the multiple portions 91 may differ from each other. Therefore, the state classification with the most number among the state classifications for the multiple portions 91 is specified as the state classification of the transparent body 9 currently molded by the molding device 2 (hereinafter, simply referred to as the "current state classification"). In the example of FIG. 8, the state classification number specified for the portion 91 is assigned inside each portion 91, and the state classification with the most number 4 is specified as the current state classification. The current state classification may be specified by using the average value of the phase difference averages in the multiple phase difference images. The number of phase difference images used to acquire the current state classification (or the cycle of acquiring the current state classification) may be appropriately determined.

[0038] In the adjustment information acquisition unit 5, a desired state division of the transparent body 9 is also set in advance, and the current state division is compared with the desired state division. If the current state division is the same as the desired state division (step S12), the process returns to step S11, and phase contrast images are acquired for different portions 91 of the transparent body 9.

[0039] When the current state classification is compared with the desired state classification and the current state classification differs from the desired state classification (step S12), the current state classification and the desired state classification are input to the estimator 51. As a result, the estimator 51 outputs molding condition change information. The molding condition change information indicates the type of molding parameter whose value should be changed and the amount of change in the value of the molding parameter. In other words, the molding condition change information is molding condition adjustment information for changing the transparent body 9 molded by the molding device 2 (transparent body 9 to be molded) from the current state classification to the desired state classification. In this way, the adjustment information acquisition unit 5 acquires molding condition adjustment information using the estimator 51 (step S13).

[0040] The molding condition adjustment information is output from the adjustment information acquisition unit 5 to the control unit 20. The control unit 20 specifies the type of molding parameter whose value should be changed and the amount of change in the value of the molding parameter from the molding condition adjustment information, and changes the value of the molding parameter by the amount of change. That is, the molding conditions are adjusted according to the molding condition adjustment information. The value of the molding parameter based on the molding condition adjustment information may be changed by an operator. In the molding condition adjustment device 3, steps S11 to S13 are repeatedly performed even after the molding conditions are adjusted.

[0041] In the above process, the current state classification is specified from the state classifications for the multiple parts 91, but the state classification for each part 91 and the desired state classification may be input to the estimator 51 of the adjustment information acquisition unit 5 to acquire adjustment information for the molding conditions. In this case, the most common adjustment information among the adjustment information for the multiple molding conditions acquired for each of the multiple parts 91 is output to the control unit 20 and used for adjusting the molding conditions. The state classification indicating the state of the transparent body 9 may be set based on the distribution or arrangement of the phase difference (density value) in the phase difference image. In addition, the phase difference acquisition unit 4 does not necessarily need to acquire a phase difference image, and for example, only a single phase difference at a predetermined position of the transparent body 9 may be acquired, and the state classification may be determined based on the phase difference.

[0042] As described above, in the molding condition adjustment device 3, the phase difference acquisition unit 4 acquires the phase difference occurring in the transparent body 9 molded by the molding device 2. The adjustment information acquisition unit 5 stores adjustment information of the molding conditions for changing the transparent body 9 molded by the molding device 2 from one state classification to another state classification. Then, based on the phase difference acquired by the phase difference acquisition unit 4 for the molded transparent body 9, adjustment information of the molding conditions for changing the transparent body 9 molded by the molding device 2 to a desired state classification is acquired. As a result, even if the state classification of the molded transparent body 9 changes unintentionally in the molding device 2, the state classification of the transparent body 9 to be molded can be set to the desired state classification using the adjustment information of the molding conditions. As a result, the transparent body 9 of the desired state classification can be stably molded.

[0043] Preferably, the phase difference acquisition unit 4 acquires a phase difference image showing the phase difference at each position of the target area in the molded transparent body 9. This makes it possible to accurately identify the state classification of the molded transparent body 9, and to accurately acquire adjustment information of the molding conditions.

[0044] Preferably, the molding device 2 molds the transparent body 9 which is a continuous sheet, and the phase difference acquisition unit 4 acquires a plurality of phase difference images at a plurality of sites 91 of the transparent body 9 within a predetermined period of time. Furthermore, the adjustment information acquisition unit 5 acquires adjustment information of the molding conditions based on the plurality of phase difference images. This makes it possible to acquire adjustment information of the molding conditions with high accuracy even if the state of the phase difference images fluctuates in the transparent body 9 molded under certain molding conditions.

[0045] Incidentally, in the molding device 2 of FIG. 2, for example, when the rotation speed of the third molding roll 233 is made higher than that of the second molding roll 232 (i.e., the draw ratio of the third molding roll 233 is made higher than 1), it has been confirmed that the average phase difference of the transparent body 9 is significantly increased. This is considered to be because the transparent body 9 is pulled toward the third molding roll 233 due to the difference in the rotation speeds of the two, causing a large tension to act, and distortion occurs inside the transparent body 9. In addition, the phase difference image of number 1 in FIG. 6 is brighter (has a larger phase difference) than the phase difference image of number 0, and it can be seen that even if the rotation speed of the third molding roll 233 is lower than the rotation speed of the second molding roll 232, the average phase difference of the transparent body 9 is increased by increasing the rotation speed of the third molding roll 233. In this way, the rotation speed of the molding rolls 231 to 233 greatly contributes to the change in the average phase difference. Therefore, it is preferable that the molding conditions include the rotation speed of at least one of the molding rolls 231 to 233, and this makes it possible to efficiently change the state classification of the transparent body 9 to be molded.

[0046] The molding condition adjustment method includes a step (step S11) of acquiring a phase difference occurring in the transparent body 9 molded by the molding device 2 using the phase difference acquisition unit 4, and a step (step S13) of acquiring molding condition adjustment information for changing the transparent body 9 molded by the molding device 2 to a desired state classification using the adjustment information acquisition unit 5 based on the phase difference acquired by the phase difference acquisition unit 4. This allows the molding device 2 to stably mold a transparent body 9 in a desired state classification.

[0047] Preferably, a trained model is generated by learning using a plurality of training data, the combination of change information of molding conditions in molding the transparent body 9 and two state categories before and after the molding conditions are changed in accordance with the change information, and the adjustment information acquisition unit 5 includes the trained model (estimator 51). This makes it possible to easily and accurately acquire adjustment information of the molding conditions.

[0048] In the molding system 1, the estimator 51 of the adjustment information acquisition unit 5 may be updated as appropriate. For example, by inputting the current state classification and the desired state classification, the estimator 51 outputs adjustment information of the molding conditions, and the molding conditions (the values ​​of the molding parameters) are changed according to the adjustment information of the molding conditions. In this case, when the transparent body 9 molded by the molding device 2 actually becomes the desired state classification by changing the molding conditions, the adjustment information of the molding conditions is treated as change information of the molding conditions, and new teacher data is added in which the current state classification and the desired state classification are the state classifications before and after the change. Then, learning is performed using a plurality of teacher data including the new teacher data, and the estimator 51 is updated (regenerated).

[0049] Furthermore, even if the molding condition adjustment information (hereinafter referred to as "adjustment information of molding conditions corresponding to the first state category") obtained by inputting the current state category (hereinafter referred to as "first state category") and the desired state category is used, the transparent body 9 molded by the molding device 2 may not be in the desired state category, but may be in another state category (hereinafter referred to as "second state category"). In this case, by inputting the second state category and the desired state category, new adjustment information of molding conditions (i.e., adjustment information of molding conditions corresponding to the second state category) is output from the estimator 51. Then, the values ​​of the molding parameters are changed according to the adjustment information of molding conditions corresponding to the second state category.

[0050] In this way, by repeatedly acquiring the molding condition adjustment information, the molding condition adjustment information corresponding to the n-th state division (where n is an integer of 2 or more) makes the transparent body 9 molded by the molding device 2 into the desired state division. In this case, the sum of the change amounts of each molding parameter from the molding condition adjustment information corresponding to the first state division to the molding condition adjustment information corresponding to the n-th state division is set as the molding condition change information, the first state division and the desired state division are set as state divisions before and after the change, and the combination of the molding condition change information and the state divisions before and after the change is added as new teacher data. Then, learning is performed using a plurality of teacher data including the new teacher data, and the estimator 51 is updated. As described above, by updating the estimator 51 using information obtained in the adjustment of the actual molding conditions, it is possible to further improve the accuracy of the estimator 51.

[0051] The adjustment information acquisition unit 5 does not necessarily need to include the estimator 51, and may, for example, store, as a table or the like, adjustment information of molding conditions for changing the transparent body 9 molded by the molding device 2 from each state classification to another state classification. In this case, when the current state classification is different from the desired state classification, the adjustment information of the molding conditions for changing the current state classification to the desired state classification is specified by referring to the table. In this case as well, the molding device 2 can stably mold the transparent body 9 in the desired state classification.

[0052] Here, the range of phase difference measurable by the measuring unit 42 in FIG. 3A will be described with reference to FIG. 9. In FIG. 9, the intensity acquired by four pixels 442 of the image sensor 44 corresponding to one polarizer group 431 is shown by shading when the phase difference occurring in the sample (here, the transparent body 9) is 0, λ / 8, λ / 4, 3λ / 8, and λ / 2, respectively, where the wavelength of light acquired by the measuring unit 42 is λ. In the following description, the pattern of the intensity acquired by the four pixels 442 is referred to as the "detection pattern at the image sensor." In addition, the "Graph" column also shows a fitting curve obtained from the orientation (angle) of the transmission axis of each polarizer 432 of the polarizer group 431 and the intensity of the pixel 442 corresponding to the polarizer 432.

[0053] As is clear from FIG. 9, when the phase difference is λ / 8 and when the phase difference is 3λ / 8, the detection patterns at the imaging element are the same, and it is not possible to distinguish between the two. The same is true when the phase difference is 0 and when it is λ / 2. In reality, the change in the detection pattern at the imaging element when the phase difference changes from 0 to λ / 4 is the same as the change in the detection pattern at the imaging element when the phase difference changes from λ / 2 to λ / 4. As described above, the measurement unit 42 cannot distinguish between a phase difference in the range of 0 to λ / 4 and a phase difference in the range of λ / 4 to λ / 2. In reality, even if the phase difference is in the range of λ / 4 to λ / 2, the measurement unit 42 outputs it as a phase difference in the range of 0 to λ / 4.

[0054] Next, a method for distinguishing between a phase difference in the range of 0 to λ / 4 and a phase difference in the range of λ / 4 to λ / 2 in the measurement unit 42 will be described. FIG. 10 is a diagram showing another example of the phase difference acquisition unit. The phase difference acquisition unit 4a in FIG. 10 further includes a phase difference generation unit 46 in addition to the illumination unit 41 and the measurement unit 42. The phase difference generation unit 46 is a wave plate (low retardation plate) that generates a uniform and slight phase difference. For example, the phase difference generation unit 46 generates a phase difference of λ / 128 to λ / 8. The phase difference generation unit 46 is disposed between the molded transparent body 9 and the measurement unit 42 and approximately parallel to the transparent body 9. A rotation mechanism 47 is attached to the phase difference generation unit 46. The rotation mechanism 47 has, for example, a motor, and rotates the phase difference generation unit 46 around the central axis J1 of the phase difference generation unit 46 (i.e., the central axis J1 perpendicular to the wave plate).

[0055] In the phase difference acquisition unit 4a, the direction of the principal axis of the phase difference generation unit 46 is adjusted as a preliminary preparation. Specifically, first, a principal axis orientation image of FIG. 11A is acquired based on the transmitted light that has passed through the target area of ​​the transparent body 9. The principal axis orientation image indicates the principal axis orientation at each position of the target area by color. In FIG. 11A, the direction of the parallel diagonal lines indicates the difference in color (difference in principal axis orientation). In the area 71 where the transmitted light passes through the phase difference generation unit 46, the color is different from that of the other areas. Next, by rotating the phase difference generation unit 46 by a rotation angle θ using the rotation mechanism 47, the color of the area 71 is matched to that of the other areas in the principal axis orientation image, as shown in FIG. 11B. That is, the direction of the principal axis of the phase difference generation unit 46 is matched to the transparent body 9. The rotation angle θ of the phase difference generation unit 46 by the rotation mechanism 47 can be acquired from the color difference (difference in principal axis orientation) between the area 71 and the other areas. With the above, the preliminary preparation is completed.

[0056] When the molding condition adjustment device 3 adjusts the molding conditions of the transparent body 9, a phase difference image is acquired as described above. Here, it is assumed that the phase difference image of FIG. 12 is acquired, and attention is paid to an area 92 on the transparent body 9 indicated by a circular area in FIG. 12 (hereinafter referred to as a "region of interest 92", and the corresponding area in FIG. 12 is also given the same reference numeral 92). In an actual phase difference image, the magnitude of the phase difference is indicated by color, but in FIG. 12 and later-described FIGS. 13A and 13B, the shading (density) in the image indicates the magnitude of the phase difference. The density (density value) of the region of interest 92 in FIG. 12 indicates the phase difference acquired in a state in which no phase difference is generated by the phase difference generation unit 46.

[0057] As the transparent body 9 moves, the attention area 92 reaches an area where the transmitted light passes through the phase difference generating unit 46, and a phase difference image is acquired. At this time, a phase difference is generated by the phase difference generating unit 46 in the attention area 92 in the phase difference image, and the density changes. Specifically, as shown in FIG. 13A, the density of the attention area 92 in the phase difference image may be brighter (lighter) than the attention area 92 in FIG. 12, and as shown in FIG. 13B, the density of the attention area 92 in the phase difference image may be darker (darker) than the attention area 92 in FIG. 12.

[0058] FIG. 14 is a diagram showing the relationship between density and phase difference in a phase difference image. As described above, in the measurement unit 42, the change in density when the phase difference changes from 0 to λ / 4 is the same as the change in density when the phase difference changes from λ / 2 to λ / 4. Therefore, as shown in FIG. 13A, the change in which the attention area 92 in the phase difference image becomes brighter due to the influence of the phase difference generation unit 46 is considered to be a change from density D1 to density D2 in FIG. 14, and the actual phase difference of the attention area 92 is specified to be within the range of 0 to λ / 4 (around 65 nm in the example of FIG. 14). That is, the measurement value of the measurement unit 42 obtained within the range of 0 to λ / 4 is used as it is in the phase difference image.

[0059] 13B, the change in which the attention area 92 in the phase difference image becomes darker due to the influence of the phase difference generating unit 46 is considered to be a change from density D3 to density D4 in FIG. 14, and the actual phase difference of the attention area 92 is specified to be within the range of λ / 4 to λ / 2 (around 195 nm in the example of FIG. 14). That is, the measurement value of the measuring unit 42 obtained within the range of 0 to λ / 4 is converted to the range of λ / 4 to λ / 2 (in reality, λ / 4 is added to the measurement value) and used in the phase difference image. Note that in FIG. 14, the image density becomes gradually brighter when the phase difference changes from 0 to λ / 4 and when the phase difference changes from λ / 2 to λ / 4, but of course the image density may become gradually darker.

[0060] 10 in which the phase difference generating unit 46 overlaps only a part of the target area, it is not possible to distinguish between a phase difference in the range of 0 to λ / 4 and a phase difference in the range of λ / 4 to λ / 2 for the entire target area, but it may be possible to estimate whether the phase difference in the other area belongs to the range of 0 to λ / 4 or the range of λ / 4 to λ / 2 by using the result of the area overlapping with the phase difference generating unit 46. In addition, by arranging a plurality of phase difference generating units 46 in the width direction, it may be possible to distinguish between a phase difference in the range of 0 to λ / 4 and a phase difference in the range of λ / 4 to λ / 2 for almost the entire target area.

[0061] As described above, in the preferred molding condition adjustment device 3, the phase difference acquisition unit 4a includes the phase difference generation unit 46 in addition to the illumination unit 41 and the measurement unit 42. The phase difference generation unit 46 is disposed between the molded transparent body 9 and the measurement unit 42, and generates a predetermined phase difference partially in the light transmitted through the target area. In addition, the molded transparent body 9 moves relative to the phase difference acquisition unit 4a. Then, for one position of the target area, the phase difference used by the adjustment information acquisition unit 5 is acquired based on the phase difference acquired by the phase difference acquisition unit 4a in a state where the phase difference is generated by the phase difference generation unit 46 and the phase difference acquired by the phase difference acquisition unit 4a in a state where the phase difference is not generated by the phase difference generation unit 46. Thereby, the phase difference at each position of the target area can be acquired or estimated in the range of 0 to λ / 2, and the state classification of the molded transparent body 9 can be accurately specified. As a result, the adjustment information of the molding conditions can be accurately acquired.

[0062] Incidentally, as a measurement unit that is a polarization camera, a configuration is also known in which a waveplate array is provided instead of the polarizer array 43 in FIG. 3A, and a polarizer with a uniform transmission axis direction is provided between the waveplate array and the image sensor 44. In the waveplate array of the measurement unit, for example, elements (waveplates) in two rows and two columns are provided as an element group for each position of the target area, and the elements of the element group have principal axis directions that differ by 45 degrees. In a measurement unit having a waveplate array and a polarizer, the change in the detection pattern at the image sensor when the phase difference changes from 0 to λ / 2 is the same as the change in the detection pattern at the image sensor when the phase difference changes from λ to λ / 2, and it is not possible to distinguish between a phase difference in the range of 0 to λ / 2 and a phase difference in the range of λ / 2 to λ. Even when such a measurement unit is used, the phase difference acquisition unit 4a having the phase difference generation unit 46 can distinguish between a phase difference in the range of 0 to λ / 2 and a phase difference in the range of λ / 2 to λ.

[0063] FIG. 15 is a diagram showing the configuration of a molding system 1 according to a second embodiment of the present invention. A molding device 2a of the molding system 1 molds a transparent body 9, which is a continuous sheet, by stretch molding. The molding device 2a includes a plurality of rolls 261 and a heater 262. The transparent body 9 before stretch molding is heated by the heater 262 while being transported by the plurality of rolls 261, thereby performing stretch molding on the transparent body 9. The molding device 2a performs one or both of longitudinal stretching, which stretches the transparent body 9 in the transport direction, and lateral stretching, which stretches the transparent body 9 in the width direction. The configuration of a molding condition adjustment device 3 is the same as that of FIG. 1.

[0064] The molding conditions for the transparent body 9 in the molding device 2a include a plurality of molding parameters. The molding parameters include, for example, the rotation speed of the roll 261a near the heater 262, the stretching ratio, and the temperature of the roll 261a. As shown in Fig. 16, when the temperature (temperature of the outer circumferential surface) of the roll 261a is increased, the variation in the phase difference (phase difference standard deviation) of the transparent body 9 is reduced. Also, as shown in Fig. 17, when the stretching ratio is increased, streaks are reduced.

[0065] In the molding system 1 of Fig. 15, similarly to the molding system of Fig. 1, a plurality of state divisions indicating the state of the transparent body 9 are set based on the phase difference, and adjustment information of molding conditions for changing the transparent body 9 molded by the molding device 2a from one state division to another state division is stored in the adjustment information acquisition unit 5 (stored as an estimator 51 in Fig. 15). Then, based on the phase difference acquired by the phase difference acquisition unit 4 for the molded transparent body 9, adjustment information of molding conditions for changing the transparent body 9 molded by the molding device 2a to a desired state division is acquired. This allows the molding device 2a to stably mold a transparent body 9 of a desired state division.

[0066] The molding condition adjusting device 3 and the molding condition adjusting method can be modified in various ways.

[0067] In the phase difference acquisition unit 4a in FIG. 10, the position of the phase difference generation unit 46 relative to the measurement unit 42 is fixed, but as described later, when the phase difference acquisition unit 4a is provided independently of the molding device 2, 2a, the phase difference generation unit 46 may be movable relative to the measurement unit 42. For example, as shown in FIG. 18, a switching mechanism 48 is provided that selectively positions the phase difference generation unit 46 at a first position between the molded transparent body 9 and the measurement unit 42 and a second position away from the first position. The switching mechanism 48 has, for example, a cylinder mechanism or a motor. The first position is a position where all of the transmitted light incident on the measurement unit 42 passes through the phase difference generation unit 46. The second position is a position where the transmitted light incident on the measurement unit 42 does not pass through the phase difference generation unit 46, and is the position of the phase difference generation unit 46 shown by the two-dot chain line in FIG. 18. Note that the rotation mechanism 47 in FIG. 10 is omitted from FIG. 18.

[0068] In the phase difference acquisition unit 4a in FIG. 18, for example, a plate-shaped transparent body 9 is taken as a measurement target. With the transparent body 9 placed below the measurement unit 42, the phase difference generation unit 46 is placed at a first position, and a first phase difference image is acquired. The phase difference generation unit 46 is placed at a second position, and a second phase difference image is acquired. Then, when the density of the first phase difference image is brighter than that of the second phase difference image at each position of the target region, the actual phase difference is determined to be within a range of 0 to λ / 4. When the density of the first phase difference image is darker than that of the second phase difference image, the actual phase difference is determined to be within a range of λ / 4 to λ / 2.

[0069] As described above, in the phase difference acquisition unit 4a in FIG. 18, a phase difference image used by the adjustment information acquisition unit 5 is acquired based on a phase difference image acquired by the phase difference acquisition unit 4a in a state where the phase difference generation unit 46 is arranged at a first position and a phase difference image acquired by the phase difference acquisition unit 4a in a state where the phase difference generation unit 46 is arranged at a second position. This makes it possible to acquire the phase difference at each position of the target area of ​​the transparent body 9 in the range of 0 to λ / 2, and to accurately specify the state classification of the molded transparent body 9. As a result, it is possible to accurately acquire adjustment information of the molding conditions. Of course, in the phase difference acquisition unit 4a in FIG. 18, a measurement unit having a waveplate array and a polarizer may be used, and a phase difference image may be acquired by distinguishing between a phase difference in the range of 0 to λ / 2 and a phase difference in the range of λ / 2 to λ.

[0070] In the above embodiment, the adjustment information of the molding conditions is acquired by the adjustment information acquisition unit 5 based only on the phase difference, but the adjustment information of the molding conditions may be acquired by combining the phase difference with information other than the phase difference. An example of information other than the phase difference is appearance information indicating the presence or absence of scratches or defects on the surface of the transparent body 9. For example, when a defect is captured at the same position of the transparent body 9 in both the appearance image captured by the normal imaging unit and the phase difference image captured by the phase difference acquisition units 4 and 4a, the defect can be identified as a defect on the surface of the transparent body 9. In addition, a defect that is captured in the phase difference image but not in the appearance image can be identified as a distortion inside the transparent body 9. In this way, by using information other than the phase difference, such as appearance information, in addition to the phase difference, it is possible to more appropriately adjust the molding conditions.

[0071] The measurement unit 42 may not have the polarizer array 43 of Fig. 3 or the above-mentioned wave plate array, so long as it is capable of acquiring the polarization state of the light transmitted through the transparent body 9. For example, a measurement unit 42 having a rotating polarizer may be used.

[0072] In the above embodiment, the phase difference acquisition unit 4, 4a of the molding condition adjustment device 3 is provided at a position where the transparent body 9 immediately after molding by the molding device 2, 2a is continuously transported, that is, on the same line as the molding device 2, 2a, but the phase difference acquisition unit 4, 4a may be provided independently of the molding device 2, 2a. In this case, the phase difference acquisition unit 4, 4a may move with respect to the stopped transparent body 9. In other words, the molded transparent body 9 may move relatively to the phase difference acquisition unit 4, 4a.

[0073] As described above, the transparent body 9 may be in the form of a plate as well as a sheet.

[0074] The configurations in the above-described embodiment and each of the modified examples may be combined as appropriate as long as they are not mutually inconsistent. [Explanation of symbols]

[0075] 2,2a Molding equipment 3 Molding condition adjustment device 4,4a Phase difference acquisition section 5 Adjustment information acquisition section 9 Transparent body 41 Lighting Department 42 Measuring part 46 Phase difference generation section 48 Switching Mechanism 51 Estimator 91 (Transparent) Part 231~233 Forming roll S11~S13 steps

Claims

1. A molding condition adjustment device for adjusting molding conditions for a sheet-shaped or plate-shaped transparent body in a molding device, comprising: a phase difference acquisition unit that acquires a phase difference occurring in a transparent body that has been molded by a molding device; a plurality of state divisions indicating the state of the transparent body are set based on a phase difference, and an adjustment information acquisition unit stores molding condition adjustment information for changing the transparent body molded by the molding device from one state division to another state division, and acquires molding condition adjustment information for changing the transparent body molded by the molding device to a desired state division based on the phase difference acquired by the phase difference acquisition unit for the molded transparent body; Equipped with The molding condition adjusting device, wherein the plurality of state divisions are a plurality of ranges obtained by dividing an entire range in which an average phase difference can be taken.

2. A molding condition adjustment device according to claim 1, A molding condition adjustment device, characterized in that the most common status category among the status categories for multiple portions of the molded transparent body is identified in the adjustment information acquisition unit as the status category of the transparent body currently being molded by the molding device.

3. The molding condition adjusting device according to claim 1 or 2, The molding condition adjustment device, wherein the phase difference acquisition unit acquires a phase difference image indicating a phase difference at each position of a target area in the molded transparent body.

4. The molding condition adjusting device according to claim 3, The molding device molds a transparent body that is a continuous sheet, the phase difference acquisition unit acquires a plurality of phase difference images at a plurality of portions of the transparent body, The molding condition adjustment device, characterized in that the adjustment information acquisition unit acquires adjustment information of the molding conditions based on the multiple phase difference images.

5. The molding condition adjusting device according to claim 3 or 4, The phase difference acquisition unit, An illumination unit that irradiates the target area of ​​the molded transparent body with polarized light; a measurement unit that measures a polarization state of transmitted light that has passed through each position in the target area to obtain a phase difference occurring at each position; A phase difference generating unit that is disposed between the molded transparent body and the measurement unit and that partially generates a predetermined phase difference in the light that has passed through the target area; Equipped with the molded transparent body is moved relative to the phase difference acquisition unit, A molding condition adjustment device characterized in that, with respect to a certain position of the target area, a phase difference used by the adjustment information acquisition unit is acquired based on a phase difference acquired by the phase difference acquisition unit in a state in which the predetermined phase difference is generated by the phase difference generation unit and a phase difference acquired by the phase difference acquisition unit in a state in which the predetermined phase difference is not generated by the phase difference generation unit.

6. The molding condition adjusting device according to claim 3 or 4, The phase difference acquisition unit, An illumination unit that irradiates the target area of ​​the molded transparent body with polarized light; a measurement unit that measures a polarization state of transmitted light that has passed through each position in the target area to obtain a phase difference occurring at each position; a phase difference generating unit that generates a predetermined phase difference in the transmitted light; A switching mechanism that selectively positions the phase difference generating unit at a first position between the molded transparent body and the measurement unit and a second position away from the first position; Equipped with A molding condition adjustment device characterized in that a phase difference image used by the adjustment information acquisition unit is acquired based on a phase difference image acquired by the phase difference acquisition unit with the phase difference generation unit disposed at the first position and a phase difference image acquired by the phase difference acquisition unit with the phase difference generation unit disposed at the second position.

7. The molding condition adjusting device according to any one of claims 1 to 6, The molding device molds a transparent body that is a continuous sheet, A molding condition adjusting device, wherein the molding conditions include a rotation speed of at least one molding roll.

8. A molding condition adjustment method for adjusting molding conditions for a sheet-shaped or plate-shaped transparent body in a molding device, comprising: a) acquiring a phase difference generated in a transparent body molded by a molding device using a phase difference acquiring unit; b) a plurality of state divisions indicating the state of a transparent body are set based on a phase difference, and adjustment information of molding conditions for changing the transparent body molded by the molding device from one state division to another state division is stored in an adjustment information acquisition unit, and a step of acquiring, by the adjustment information acquisition unit, adjustment information of molding conditions for changing the transparent body molded by the molding device to a desired state division based on the phase difference acquired in step a); Equipped with The molding condition adjusting method, wherein the plurality of state divisions are a plurality of ranges obtained by dividing an entire range in which an average phase difference can be taken.

9. A molding condition adjustment method according to claim 8, A molding condition adjustment method, characterized in that in step b), the most prevalent condition category among the condition categories for multiple portions of the molded transparent body is identified as the condition category of the transparent body currently being molded by the molding device.

10. The molding condition adjusting method according to claim 8 or 9, A trained model is generated by learning using a plurality of training data, the training data being a combination of change information of molding conditions in molding a transparent body and two state categories before and after the molding conditions are changed in accordance with the change information; A molding condition adjustment method, characterized in that the adjustment information acquisition unit includes the trained model.

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