JP2001041898A - Apparatus and method for detecting flaw of roll-shaped film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately and certainly detect the flaw caused in a roll-shaped film without incorrect discrimination by making it possible to discriminate the flaw corresponding to the characteristics thereof. SOLUTION: Image sensors 2A-2C receive the light allowed to irradiate a roll-shaped film along the surface in the peripheral direction thereof to inspect the surface irregularities of the roll-shaped film over the whole surface in the width direction of the roll-shaped film and the detection values of the image sensors 2A-2C are sent to a signal processor 3. The signal processor 3 calculates the base lines of the detection values from the image sensors 2A-2C by a shape analyzing processing part 11 and the base lines are subtracted from the detection values of the image sensors 2A-2C by a corrected detection value calculating part 12 to calculate corrected detection values. The flaw discrimination part 15 of the signal processor 3 discriminates the presence of the flaw of the roll- shaped film on the basis of the corrected detection values calculated by the corrected detection value calculating part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defect detecting apparatus and a defect detecting method for detecting defects such as wrinkles generated near the surface of a roll-shaped film, and more particularly to a method suitable for use in a transparent or translucent roll-shaped film. The present invention relates to an apparatus and a method for detecting a defect of a roll film.

[0002]

2. Description of the Related Art Conventionally, attempts have been made to automate the detection of defects such as wrinkles and scratches which occur when winding a roll-shaped film wound around a paper tube by using an image processing technique. As such a technique, for example, Japanese Patent Laid-Open No. 6-14 / 1994
There is a technique disclosed in Japanese Patent No. 7868. In this technology, a solid-state imaging camera captures a reflection image from the outer peripheral surface of the sheet roll, compares it with a reflection image without a defective portion,
It is determined whether there is a defect.

[0003]

By the way, many defects such as wrinkles and scratches which occur when the roll-shaped film is wound up often appear near the surface of the roll-shaped film in some state. As a matter of course, the color and material of the defective portion are not different from those of the normal portion which is not the defective portion. However, even if an image near the surface of the roll film is captured by an image input device (for example, an image sensor) and image processing is performed to detect a defect, a difference in density between a defective portion and a normal portion is hard to appear. Detecting defects is not easy.

[0004] Therefore, for example, the arrangement and angle of an illumination device, an image input device, and the like are adjusted so that the difference in density between a defective portion and a normal portion is emphasized, and defects such as wrinkles can be detected with high accuracy. However, in practice, it is difficult to appropriately adjust the arrangement, angle, and the like of the illumination device and the image input device that constitute the optical system according to defects such as wrinkles. The technology disclosed in the above-mentioned publication also only compares the captured image with a non-defective image, so that it may not be possible to reliably detect a defect depending on the type of defect.

[0005] Even if such an adjustment of the optical system can make the difference in density between the defective portion and the normal portion to some extent, and can improve the accuracy of defect detection to some extent, there is a limit to this. . In other words, as described above, since the defective portion and the normal portion of the roll-shaped film are originally of the same density, the brightness (density) of the defective portion is increased by adjusting the optical system so as to make the defective portion stand out. However, the brightness of the normal part naturally increases. For this reason, it is difficult to make a difference in shading depending on the type of a defect such as a wrinkle generated near the surface of the roll-shaped film. In such a case, it is difficult to improve the accuracy of the defect detection only by adjusting the optical system.

In view of the above, not only the adjustment of the optical system as described above, but also a process such as wrinkles or the like generated near the surface of the roll-shaped film in the image processing of the image captured through the image input device is emphasized. There is a need.

[0007] By the way, in a general image processing technique, a process is performed to make a characteristic portion stand out by a feature extraction process such as a differential process. However, even when such a feature extraction process is performed, it is difficult to make the feature portion stand out if there is not much difference in shading between the feature portion and other portions. Similarly, it is also difficult to perform image processing so as to make the defective portion stand out in the detection of the defect of the roll-shaped film where the density difference between the defective portion such as a wrinkle or a scratch and the normal portion is not so large.

The density (brightness) of an image input to an image processing device via an image input device differs depending on the type of defects such as wrinkles and scratches generated near the surface of the roll film and the manner of adjusting the optical system. Therefore, it is difficult to determine defects such as wrinkles and scratches by directly using the density (luminance) of the input image in image processing. In other words, when the overall brightness of the input image is increased or decreased, the normal part is determined to be a defective part, or conversely, the defective part is determined to be a normal part. It is difficult to detect defects with high accuracy.

For this reason, it is conceivable to provide a plurality of thresholds in accordance with the types of defects such as wrinkles and scratches generated near the surface of the roll-shaped film and perform defect determination for each defect. It is not preferable because it is complicated. The present invention has been made in view of such problems, and enables a defect occurring in a roll-shaped film to be determined according to its characteristics, without erroneous determination, so that a defect can be accurately and reliably detected. It is an object of the present invention to provide a defect detection device and a defect detection method for a rolled film.

[0010]

According to the first aspect of the present invention, there is provided an apparatus for detecting defects in a roll-shaped film according to the present invention, which receives light irradiated along a circumferential surface of the roll-shaped film. It is characterized by comprising an image sensor for inspecting the unevenness of the surface of the film over the entire surface in the roll width direction, and a signal processing device for detecting the presence or absence of a defect in the roll-shaped film based on a detection value from the image sensor.

According to a second aspect of the present invention, there is provided the roll film defect detecting apparatus according to the first aspect, wherein the signal processing device includes a morphological analysis processing section for calculating a baseline of a detection value from the image sensor. A correction detection value calculating unit that calculates a correction detection value by subtracting a baseline from a detection value from the image sensor; and determining whether there is a defect in the roll-shaped film based on the correction detection value calculated by the correction detection value calculation unit. And a defect determining unit.

According to a third aspect of the present invention, in the device for detecting a defect of a roll-shaped film according to the second aspect, the signal processing device calculates a peak value of the correction detection value calculated by the correction detection value calculation section. A peak value calculating unit for determining whether or not there is a defect in the roll film by comparing the peak value calculated by the peak value calculating unit with a threshold for peak value determination. And

According to a fourth aspect of the present invention, there is provided the roll film defect detecting apparatus according to the third aspect, wherein the signal processing device calculates a peak width based on a detection value from the image sensor. A calculating unit, wherein the defect determining unit compares the peak value calculated by the peak value calculating unit with a threshold for peak value determination, and determines the peak width and the peak width determined by the peak width calculating unit. The characteristic is that the defect of the roll-shaped film is determined by comparing with a threshold value for use.

According to a fifth aspect of the present invention, there is provided the roll-shaped film defect detecting apparatus according to the first aspect, wherein the signal processing device has a height of about 50 micrometers to about 1000 micrometers. It is characterized in that a defect due to a degree of winding bump is determined. According to a sixth aspect of the present invention, there is provided the roll-shaped film defect detecting apparatus according to the third aspect, wherein the image sensor comprises:
Three or more are arranged in the circumferential direction on the roll-shaped film, and the morphological analysis processing unit is configured to calculate each baseline of each detection value from each image sensor,
The correction detection value calculation unit is configured to calculate each correction detection value by subtracting each baseline from each detection value from each image sensor, and the peak value calculation unit
The correction detection value calculator is configured to calculate the peak value of each correction detection value calculated by the correction detection value calculation unit, and the defect determination unit calculates two of the peak values on the same circumference calculated by the peak value calculation unit. When the peak value is equal to or more than the peak value determination threshold, it is determined that the roll-shaped film has a defect due to winding bumps.

According to a seventh aspect of the present invention, there is provided the roll-shaped film defect detecting apparatus according to the first aspect, wherein the image sensor receives light irradiated on a surface on one end side of the diameter of the roll-shaped film. And a receiver for receiving light irradiated to the surface on the other end side, and a total of four are provided. A signal processing device determines the presence or absence of a defect in the roll-shaped film, It is characterized in that the diameter is calculated.

According to a eighth aspect of the present invention, there is provided a method for detecting defects in a roll-shaped film according to the present invention, wherein the unevenness on the surface of the roll-shaped film is reduced by an image sensor which receives light irradiated along the circumferential surface of the roll-shaped film. The method is characterized by including a step of inspecting the entire surface in the direction and a step of detecting the presence or absence of a defect in the roll-shaped film based on a detection value from the image sensor.

Preferably, a step of calculating a baseline of a detection value of the image sensor by a morphological analysis process;
A step of calculating a correction detection value by subtracting a baseline from a detection value of the image sensor; a step of calculating a peak value of the correction detection value; and a step of determining a defect of the roll-shaped film based on the peak value. .

[0018]

Embodiments of the present invention will be described below with reference to the drawings. First, a roll-shaped film defect detecting apparatus according to a first embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. The roll film defect detecting apparatus according to the present embodiment is for detecting a defect of a roll film as an object to be inspected.

First, the roll film and the types of defects thereof will be described. As shown in FIG. 2, the roll film 1 is a transparent or translucent film (for example, a wrap film or the like) and has a cylindrical core [paper tube, for example, having an outer diameter of 90 mm.
mm (radius: 45 mm)] The film 1A is wound into a roll around 1B. As shown in FIGS. 7A to 7F, the types of defects of the roll-shaped film 1 include a band-shaped wrinkle 50A, a winding bump 50B, a scratch 50C, a vertical wrinkle 50D, an oblique wrinkle 50E, a foreign matter 50F, and the like. There is.

Here, as shown in FIG. 7 (A), the band-shaped wrinkles 50A are band-shaped wrinkles generated when the film has a locally thin portion, etc., have a certain width α, and have a certain width α on the roll surface. The feature is that it occurs over the circumference. As shown in FIG. 7B, the winding bump 50B is generated due to a concave portion of a rubber roll for transporting a film.
It is characterized in that the surface rises over the entire circumference of the roll in a rolled state to form a bump. This winding bump has a high height [winding bump (large)] 50B
A and 50BB having a small height [winding bump (small)]. Here, the winding bump (small) 50BB has a height of about 50
Micrometer (also called μm or micron) to about 10
It is about 00 micrometers and about 1 to 2 cm wide.

The scratch 50C is, as shown in FIG. 7C, a scratch or the like caused by a cutter for cutting the film, and is characterized by being generated over the entire circumference of the roll surface. As shown in FIG. 7D, the vertical wrinkles 50D are characterized in that unlike the above-described wrinkles, short vertical streaks enter randomly and do not extend over the entire circumference of the roll surface. As shown in FIG. 7E, the oblique wrinkles 50E are caused by defective film cutting or the like. In particular, it often occurs around winding bumps.

As shown in FIG. 7F, the foreign matter 50F
For example, burnt portions of the film, insects and hair that have entered between the films, which appear to be mainly black, and are characteristically formed inside the roll-shaped film. The size of the foreign matter (also referred to as a black foreign matter) which is regarded as a defect is, for example, about 0.4.
mm or more. It should be noted that, although not such a defect, those that are detected as defects in the defect detection include a winding end 50G on the roll surface (see FIG. 7 (G)), a winding start inside the roll, a spiral of a paper tube, and the like. .

The roll-shaped film defect detecting apparatus according to the present embodiment uses the winding bump (small) 5 among these defects.
This is to detect a defect due to 0BB. The feature of the defect caused by the winding bump (small) 50BB is that it occurs over the entire circumference of the surface of the roll-shaped film 1 as described above, and the height of the defect caused by the bump is about 50 microns to about 1000 microns. For this reason, for example, in the defect detection by the bright defect method for recognizing a high-luminance portion as a defect, even if an attempt is made to detect a defect from the density projection of the original image including the defect due to the winding bump (small) 50BB,
A defective portion due to the winding hump (small) 50BB having a low height is unlikely to appear as a luminance peak, and it is difficult to reliably detect the defect.

On the other hand, if a parallel light line sensor (parallel light image sensor), which will be described later, uses a parallel light line sensor (parallel light image sensor) to detect the defect caused by the winding edge (small) 50BB, the parallel light line sensor detection value of the defective part is a normal part. It was found that it protruded to a higher side than the detected value and a peak appeared. In addition,
According to the parallel light line sensor, the winding bump can be determined regardless of its size. However, in the present embodiment, for example, for the roll-shaped film 1 in which it is difficult to detect the defect based on the density projection, the defect by the parallel light line sensor is used. Detection shall be performed. By detecting irregularities on the film surface with the parallel light line sensor in this way,
The presence or absence of a winding edge (large) on the roll-shaped film 1 to be inspected can be detected more accurately than other methods, and the winding edge (small) can also be detected.

Therefore, in the present embodiment, attention is paid to such a feature of the defect caused by the winding bump (small) 50BB, and the defect caused by the winding bump (small) 50BB is detected by the peak value of the detection value from the parallel light line sensor. Like that. For this reason, as shown in FIG. 2, the present defect detection device includes a plurality of (here, three) parallel light line sensors (parallel light image sensors) 2A to 2C and a signal processing device (data processing device) 3.
And a display device 4.

The parallel light line sensors 2A to 2C constitute a measurement system, and the signal processing device 3 constitutes a signal processing system for processing detection values (detection signals) by the parallel light line sensors 2A to 2C. Parallel light line sensor 2A ~
2C is to inspect the unevenness of the surface of the roll-shaped film 1 over the entire surface in the roll width direction by receiving the light irradiated along the circumferential surface of the roll-shaped film 1.

These parallel light line sensors 2A to 2C
As shown in FIG. 2, are arranged near the surface of the roll-shaped film 1 so as to be able to detect a defect due to a winding hump (small) on the surface of the roll-shaped film 1, respectively. They are arranged in series along the roll circumferential direction. The detection signals (detection values) of the parallel light line sensors 2A to 2C are output to the signal processing device 3.

Here, each parallel light line sensor 2
A to 2C are arranged in series along the roll circumferential direction, but are not limited to this. For example, when the parallel light line sensors 2A to 2C cannot be arranged in series along the roll circumferential direction (for example, when the diameter of the roll film is small), the respective positions are shifted in the roll width direction and arranged. Is also good. In this case, each parallel light line sensor 2A ~
It is necessary to correct the position in the roll width direction by arithmetically processing the measurement data from 2C. The same applies to a case where two parallel light line sensors are provided or a case where three or more parallel light line sensors are provided.

As described above, the three parallel light line sensors 2A
2C is arranged so that when a defect caused by the winding edge (small) 50BB of the roll-shaped film 1 is detected, the winding end 50G is wound around the outer peripheral surface of the roll-shaped film 1 [FIG.
This is to prevent erroneous determination of the winding end 50G as the winding hump (small) 50BB. That is, the winding end 50G is generated at one position on the outer peripheral surface of the roll-shaped film 1, whereas the winding hump (small) 50BB is generated over the entire circumference of the roll-shaped film 1. When two or more detection signals (sensor outputs) of the detection signals (sensor signals) of the optical line sensors 2A to 2C are convex in the same phase (that is, the same roll width position) (that is, the rolls having the same detection value are detected). If it is equal to or greater than the predetermined detection value at the width position), it can be considered that the winding edge (small) 50BB. For this reason, three parallel light line sensors 2A to 2C are provided so that the winding end 50G is not erroneously determined as the winding hump (small) 50BB.

From this point of view, it is sufficient to provide two parallel light line sensors. In this case, three parallel light line sensors are provided and, for example, one out of three parallel light line sensors is provided. Even if the parallel light line sensor makes an erroneous detection or the like, the winding bump (small) 50BB generated over the entire circumference of the roll-shaped film 1 can be reliably determined. Of course, only two parallel light line sensors may be provided.

These parallel light line sensors 2A to 2C
As shown in FIG. 3, a light projector 2a and a light receiver 2b are provided so as to face each other, and planar parallel light emitted from the light projector 2a at one end is received by the light receiver 2b at the other end. The light projector 2a sends out the laser light (for example, red laser light) emitted from the visible light semiconductor laser element 2c as parallel light (plane light) S by the light projecting lens 2d. The parallel light sent out passes through the band-pass filter 2e of the light receiver 2b,
A one-dimensional CCD that is built into the CCD and can detect the amount of light emitted from the projector 2a and also detect its position information.
Image sensor (solid-state image sensor, solid-state image sensor)
The light is received by 2f.

Since the one-dimensional CCD image sensor is a line sensor for measuring a linear light intensity distribution, it is also called a CCD line sensor. Here, the parallel light line sensor is provided as having the CCD line sensor. However, if it is regarded as having the CCD image sensor, it can be referred to as a parallel light image sensor.

When there is a winding bump (small) 50BB on the surface of the roll-shaped film 1, the parallel light S emitted from the light projector 2a is blocked by the winding bump (small) 50BB.
In the one-dimensional CCD image sensor 2f of the light receiver 2b, a shadow portion where the parallel light S is not irradiated is generated in proportion to the size of the winding edge (small) 50BB. The size and position of the shadow portion are calculated by the CCD image sensor 2f scanning at, for example, 780 times / sec, and the winding edge (small) 5 of the roll-shaped film 1 is calculated.
A detection signal (detection value) corresponding to 0BB is output.

More specifically, if the rolled film 1 has a winding edge (small) 50BB, the position of the parallel light (ie, the lower end position of the parallel light) captured by the CCD image sensor 2f of the light receiver 2b changes. When the position of the parallel light is shifted by a predetermined amount or more, it is determined that there is a defect due to the winding edge (small) 50BB. If the rolled film 1 has a winding edge (small) 50BB, the length of the parallel light captured by the CCD image sensor 2f of the light receiver 2b changes, or the amount of the parallel light changes. For this reason, when the length of the parallel light is less than a predetermined length or when the amount of the parallel light is less than a predetermined amount, it is determined that there is a defect due to the winding bump (small) 50BB. Is also good.

Such parallel light line sensors 2A to 2C
Is used. The low winding bump (small) 50BB having a height of about 50 microns to about 1000 microns is detected by, for example, capturing a reflected image by a CCD camera or the like and processing the image. Is difficult.
On the other hand, if the parallel light line sensors 2A to 2C are used, about 50 microns to about 1000 microns (particularly,
A raised portion of small winding bumps (small) 50BB (about 150 microns to about 250 microns) can also be detected.

Roll film 1 as inspection object
As shown in FIG. 4, these parallel light line sensors 2
A (2B, 2C) is disposed in a stationary state between the light projector 2a and the light receiver 2b. Then, the parallel light line sensor 2A
(2B, 2C), as shown by the arrow in FIG. 4, is moved in parallel from one end of the roll-shaped film 1 to the other end, and scans the surface of the roll-shaped film 1. ing. That is, each parallel light line sensor 2A
In (2B, 2C), the roll film 1 is moved in parallel so that the same phase of the roll film 1 can be detected.
FIG. 4 shows only the parallel light line sensor 2A for easy understanding. In FIG. 4, reference symbol S indicates parallel light (planar light).

As described above, since the three parallel light line sensors need only be moved in parallel in the roll width direction from the end of the roll-shaped film 1, a shorter time is required as compared with a case where the sensors are rotated and detected. Can perform defect detection,
Cost can also be kept low. Here, FIG. 5 shows the parallel light line sensors 2A and 2A when the roll film 1 having the winding edge (small) is scanned by the parallel light line sensor.
2 shows an example of detection signals (detection values) of 2B and 2C.
In addition, in FIG. 5, as shown by the code | symbol X, winding edge (small)
The case where two 50BB are arranged is shown. In this case, the winding hoop (small) 50BB has a width of about 1 cm and a height of about 200 microns, and even if the winding hump (small) 50BB has such a small height, the parallel light line sensors 2A, 2B, It can be seen that detection can be performed by using 2C.

The signal processing device 3 processes each of the detection values (detection signals) from the plurality (three in this case) of the parallel light line sensors 2A to 2C and generates a winding edge (small edge) generated on the roll film 1. ) 50BB is detected as a defect. As shown in FIG. 1, the signal processing device 3 includes an opening processing unit (morphological analysis processing unit) 11, a correction detection value calculation unit 12, a peak value calculation unit 13, and a half-value width calculation unit (peak width calculation unit). 14), a defect determination unit 15,
A threshold value storage unit 16 for peak value determination and a threshold value storage unit for half width determination (threshold value storage unit for peak width determination) 17 are provided.

The processing and calculation by the opening processing unit 11 and the correction detection value calculation unit 12 are performed for the following reasons. That is, the parallel light line sensors 2A to 2C
As shown in FIG. 5, the detected value of
Since the detected value of the normal part other than the defective part due to B also gradually increases, the detected value of the defective part by the winding edge (small) 50BB is affected by the detected value of the normal part,
This is because it is difficult to absolutely evaluate the detected value of the defective portion, and it is difficult to perform the defect detection using the detected value of the defective portion as it is.

The opening processing unit 11 performs an erosion process (erosion, erosion) and an expansion process (dilation, dilation) on the respective detection values detected by the parallel light line sensors 2A to 2C in order. By performing (a type of morphological analysis), a baseline (base signal) of each detected value is calculated. These baselines are shown in FIG.
It becomes as shown by.

Here, the opening process is a process in which an erosion process (erosion) is performed first, followed by an expansion process (dilation, dilation). Of these, the erosion processing is performed by each of the parallel light line sensors 2A to 2C.
Are plotted on the basis of the minimum value of the detection value detected in each of a predetermined range (each predetermined width). When such an erosion process is performed, the detection data becomes as indicated by a chain line C in FIG.

Next, expansion processing is performed on the signal obtained by such erosion processing to plot the maximum value in each predetermined range (every predetermined width). Thereby, a baseline is obtained (broken line B in FIG. 5). The correction detection value calculation unit 12 calculates each detection value (sensor signal, original detection value) detected by each of the parallel light line sensors 2A to 2C and each base line (base signal) calculated by the opening processing unit 11. Is calculated (subtraction processing). That is, each of the parallel light line sensors 2A-2A
The correction detection value is calculated by subtracting the corresponding baseline (broken line B in FIG. 5) from the detection value C (solid line A in FIG. 5). This correction detection value is as shown by a solid line D in FIG.

Thus, each of the parallel light line sensors 2A to 2A
Among the detection values of 2C, the detection value of the normal portion other than the defective portion due to the winding edge (small) 50BB is corrected to near zero, and the detection value of the normal portion among the detection values of the parallel light line sensors 2A to 2C gradually increases. Even if it is increased, the winding edge (small) 5 is not affected by the detection value of the normal part.
Defects due to 0BB can be reliably determined.

The peak value calculation section 13 calculates the peak value of each correction detection value calculated by the correction detection value calculation section 12. That is, the peak value calculation unit 13
Calculates a peak value equal to or greater than a predetermined detection value among the correction detection values. The half-value width calculating unit 14 calculates a half-value width of a portion having a peak value of each correction detection value calculated by the correction detection value calculating unit 12 [half value (half value) of a peak value of a portion having a peak value of the correction detection value. )) Is calculated.

The reason why the half width is also taken into consideration is that even if the peak value of the corrected detection value is high, if the half width is narrow, the defect may not be caused by the winding bump (small) 50BB. Is not misjudged as a defect caused by the winding bump (small) 50BB.
This is to make it possible to reliably determine the defect caused by the defect.
Here, the half-value width calculating unit 14 calculates the half-value width of the peak. However, the half-value width calculating unit 14 calculates the width of a portion of each correction detection value calculated by the correction detection value calculation unit 12 where the peak exists. , Wrap a narrow peak, bump (small)
The peak width is not limited to this as long as it can be prevented from being erroneously determined as a defect due to 50BB. For this reason, the half-width calculator 14 is also referred to as a peak width calculator.

The defect discriminating section 15 includes a correction detection value calculating section 12
Based on the peak value and the half value width of the corrected detection value of each of the parallel light line sensors 2A to 2C calculated according to the formula (1), the defect caused by the winding bump (small) 50BB [that is, the correction detection value corresponding to the winding bump (small) 50BB] Of the convex portion of. Therefore, the defect determination unit 15 includes a peak value determination unit 15A and a half-value width determination unit (peak width determination unit) 1
5B and a winding edge (small) determining unit 15C.

The peak value judging unit 15A calculates each of the parallel light line sensors 2A to 2C calculated by the peak value calculating unit 13.
Is compared with the peak value determination threshold value (first set detection value, height of about 50 μm) stored in the peak value determination threshold value storage unit 16.
Each peak value is a threshold for peak value judgment (height approx.
m) or not.

The half-value width determining unit 15B includes a half-value width calculating unit 14
And the half-value width of the peak of the correction detection value of each of the parallel light line sensors 2A to 2C calculated by the above-described formula, and the half-value width determination threshold value stored in the half-value width determination threshold value storage unit 17 (first setting). The width and the width of about 3 mm are compared with each other to determine whether or not each half-width is equal to or greater than the half-value width determination threshold (width of about 3 mm).

The half-width determining unit 15B compares the peak width of the corrected detection value of each of the parallel light line sensors 2A to 2C with a peak width determining threshold value, and determines that the width of each peak is equal to the peak width. What is necessary is just to determine whether or not it is not less than the width determination threshold value. For this reason, the half-value width determination unit 15B
Is called a peak width determination unit. Here, the peak value judgment threshold value storage unit 16 stores a preset peak value judgment threshold value (height: about 50 μm).

Further, the threshold value storage unit 17 for determining the half-value width is used.
Is a preset half-value width determination threshold (width of about 3 m
m) is stored. Here, the half-value width determination threshold value storage unit 17 stores a half-value width determination threshold value set in advance as a value corresponding to the half-value width of the peak. In addition, the threshold value storage unit 17 for half value width determination
May store a threshold value for peak width determination preset as a value corresponding to the peak width. For this reason, the half-value width determination threshold storage unit 17 is also referred to as a peak width determination threshold storage unit.

The winding edge (small) judging section 15C is one of the judgment results of the peak value judging section 15A and the half width judging section 15B for the peak value and the half width of the corrected detection value of each of the parallel light line sensors 2A to 2C. The two or more judgment results indicate that the peak value is a peak value judgment threshold (height of about 5).
0 μm) or more, and if the half-width is equal to or more than the half-value width determination threshold (width of about 3 mm), it is determined that the defect is due to the winding bump (small) 50BB. .

The reason why the defect caused by the winding bump (small) 50BB is determined based on two or more of the determination results of the peak value determining unit 15A and the half value width determining unit 15B is as follows. This is because defects due to 50BB occur over the entire circumference of the roll-shaped film 1. That is, since the defect due to the winding edge (small) 50BB occurs over the entire circumference of the roll-shaped film 1, the same phase (the same roll width position) of the roll-shaped film 1 is determined by the parallel light line sensors 2A to 2C as described above. These parallel light line sensors 2A to 2C
The peak value and the half value width of each correction detection value are determined by the peak value determination unit 15A and the half value width determination unit 15B, whereby two or more determination results in the same phase (the same roll width position) are determined. Winding bump (small) generated over the entire circumference of the roll film 1 depending on the result
That is, 50BB can be reliably determined.

On the other hand, the winding edge (small) judging section 15C determines two or more of the three judgment results of the peak value judging section 15A and the half value width judging section 15B described above.
The peak value is the threshold for peak value judgment (height approx. 50 μm)
If not, and the half-value width is not equal to or more than the half-value width determination threshold value (width of about 3 mm),
It is determined that the defect is not caused by the winding edge (small) 50BB.

For example, each of the parallel light line sensors 2A to 2C
One of the determination results by the peak value determination unit 15A and the half-value width determination unit 15B for the peak value and the half-value width of each of the corrected detection values is a peak-value determination threshold (height approx. 50 μm) or more, and
When the half-value width is equal to or more than the half-value width determination threshold value (width of about 3 mm), it is determined that the winding end of the roll-shaped film 1 is 50G. For this reason, the winding edge (small) determining unit 15C is also referred to as a winding end determining unit.

Then, the signal processing device 3 creates display data for displaying the determination result on the display device 4,
The display data is output to the display device 5. Note that the signal processing device 3 is configured to store the determination result by the defect determination unit 15 as data in a storage device. The display device 4 displays display data according to the above-described determination result. For example, when a defect is detected by the signal processing device 3, the type and position of the defect are displayed on a monitor. Has become.

Since the apparatus for detecting a defect of a rolled film according to the first embodiment of the present invention is configured as described above, the method of detecting a defect by this apparatus is as follows. That is, as shown in FIG. 6, in step S10,
The detection signal (detection value) of each of the parallel light line sensors 2A to 2C that scans in synchronization with the roll film 1 in the roll width direction while the roll film 1 is stationary is read for each roll width position of the roll film 1, Step S20
Proceed to.

In step S20, the opening processing unit 11 performs an opening process of sequentially performing an erosion process and an expansion process on the respective detection values of the parallel light line sensors 2A to 2C, thereby detecting each of the values. The base line of the value is calculated, and the process proceeds to step S30. Next, in step S30, the correction detection value calculation unit 12 calculates each correction detection value by subtracting each base line from each detection value of each of the parallel light line sensors 2A to 2C, and proceeds to step S40.

Next, in step S40, the peak value of each correction detection value is calculated by the peak value calculation unit 13, and each half value width is calculated by the half value width calculation unit 14. In step S50, the peak value determination The threshold value for peak value determination (about 50 μm in height) is stored in the threshold value storage unit 16.
m) as well as the half-value width determination threshold value (width of about 3 mm) from the half-value width determination threshold value storage unit 17, and then proceeds to step S60.

Then, in step S60, the defect discriminating unit 1
5 determines a defect by the winding bump (small) 50BB based on the peak value and the half value width of the correction detection value of each of the parallel light line sensors 2A to 2C. That is, first, the peak value determination unit 15A of the defect determination unit 15 determines whether each of the parallel light line sensors 2A calculated by the peak value calculation unit 13 is correct.
It is determined whether or not the peak value of each of the corrected detection values of 2C to 2C is equal to or greater than a threshold value for peak value determination (height: about 50 μm). Further, the half value width determination unit 15B of the defect determination unit 15
It is determined whether or not the half-value width of each correction detection value of each of the parallel light line sensors 2A to 2C calculated by the half-value width calculation unit 14 is equal to or greater than a half-value width determination threshold value (width of about 3 mm). Then, the winding edge (small) determination unit 15 </ b> C determines, among the determination results of the peak value determination unit 15 </ b> A and the half value width determination unit 15 </ b> B for the peak value and the half value width of the corrected detection value of each of the parallel light line sensors 2 </ b> A to 2 </ b> C. When two or more determination results indicate that the peak value is the peak value determination threshold (height of about 50).
μm) or more and the half-width is equal to or greater than the half-width determination threshold value (width of about 3 mm), it is determined that the defect is caused by the winding edge (small) 50BB. Note that the defect determination unit 15 stores this determination result as data in a storage device.

As a result, if it is determined that the defect is caused by the winding edge (small) 50BB, the process proceeds to step S70,
Display data for displaying this determination result on the display device 4 is created, and the defect determination unit 15 outputs the display data to the display device 4 in step S80. Thereby, the result of the determination is displayed on the display device 4. In addition, two or more of the determination results of the above-described peak value determination unit 15A and half-value width determination unit 15B indicate that the peak value is equal to or greater than the peak value determination threshold (height: about 50 μm), and ,
If the half value width is not equal to or greater than the half value width determination threshold value (width of about 3 mm), the winding bump (small) 50B
It is determined that the defect is not caused by B.

For example, each of the parallel light line sensors 2A to 2C
One of the determination results of the peak value determination unit 15A and the half value width determination unit 15B with respect to the peak value and the half value width of each of the corrected detection values is a peak value determination threshold value (approximately height). 50 μm) or more and when the half-width is equal to or more than the half-value width determination threshold value (width of about 3 mm), it is determined that the winding end of the roll-shaped film 1 is 50G.

Therefore, according to the roll film defect detecting apparatus according to the present embodiment, the roll film 1
Since the parallel light line sensor 2A receives the light irradiated on the surface of the roll-shaped film 1 along the circumferential direction of the roll-shaped film 1, the unevenness of the entire width direction of the roll-shaped film 1 is inspected.
There is an advantage that the defect can be accurately and reliably detected without erroneously detecting a defect generated on the surface of the roll film 1.

The three parallel light line sensors 2A to 2A
Each of the detected values from C is subjected to morphological analysis processing to calculate respective baselines, and based on the calculated baselines, respective corrected detected values are calculated, and the respective corrected detected values emphasizing the defect caused by the winding bump (small) 50BB Therefore, there is an advantage that the defect can be detected more accurately and accurately without erroneously detecting a defect generated on the surface of the roll-shaped film 1.

The three parallel light line sensors 2A to 2A
C, the surface of the roll-shaped film 1 is inspected, and the defect determination unit 15 determines that two or more of the peak values calculated by the peak value calculation unit 13 are equal to or more than the threshold for peak value determination. In such a case, the roll-shaped film 1 is determined to have a defect due to the winding edge, so that the winding end 50G of the roll-shaped film 1 is not erroneously determined as the winding edge, and the roll-shaped film 1 is accurately and reliably formed. There is also an advantage that a defect due to winding bumps can be detected.

Another advantage is that defects caused by winding bumps having a height of about 50 μm to about 1000 μm on the roll-shaped film 1 can be reliably detected. In the above-described first embodiment, the winding edge (small) determining unit 15C determines the winding edge (small) 50BB and the winding end 50G, but the roll-shaped film 1 does not have the winding end 50G ( For example, winding end 5
In the case of detecting a defect due to a winding edge of the roll-shaped film 1 in a state where 0 G is flattened, only one or two parallel light line sensors may be provided.

In the above-described first embodiment, three parallel light line sensors are provided. However, when the diameter of the roll film is large or the installation space can be sufficiently secured, more than three parallel light line sensors are provided. May be provided. Further, in the above-described first embodiment, three parallel light line sensors are used. However, when the outer diameter of the roll film 1 is smaller than the inspection range of the parallel light line sensor, one parallel light line sensor is used. Since line sensors can detect two points on the roll film 1, only one parallel light line sensor needs to be provided.

Next, an apparatus and a method for detecting a defect of a rolled film according to a second embodiment of the present invention will be described with reference to FIGS. The roll-shaped film defect detection device according to the present embodiment differs from the first embodiment in the number of parallel light line sensors. In this embodiment, instead of providing three parallel light line sensors, Four parallel light line sensors are provided.

As shown in FIG. 8, these four parallel light line sensors 2A to 2D are arranged near the surface of the roll-shaped film 1 so that defects on the surface of the roll-shaped film 1 can be detected. They are arranged at the same position in the roll width direction so as to be in series along the roll circumferential direction. Then, similarly to the first embodiment, detection signals (detection values) of these four parallel light line sensors 2A to 2D are provided.
Are output to the signal processing device 3. Here, four parallel light line sensors 2A to 2D are provided as two pairs of parallel light line sensors. That is, two parallel light line sensors 2A and 2C arranged in parallel with each other with the roll film 1 interposed therebetween constitute one set, and similarly two parallel light sensors arranged in parallel with each other with the roll film 1 interposed therebetween. Two sets of parallel light line sensors (a total of four parallel light line sensors) are provided with one set of line sensors 2B and 2D.

Here, each parallel light line sensor 2
A to 2D are arranged in series along the roll circumferential direction, but are not limited to this. For example, when the parallel light line sensors 2A to 2D cannot be arranged in series along the roll circumferential direction (for example, when the diameter of the roll film is small), the respective positions are shifted in the roll width direction. Is also good. In this case, each parallel light line sensor 2A ~
It is necessary to correct the position in the roll width direction by performing arithmetic processing on the measurement data from 2D.

As described above, the four parallel light line sensors 2A
2D are arranged as two pairs of parallel light line sensors, as in the case of the above-described first embodiment, when a defect is detected by the winding bump (small) 50BB generated in the roll-shaped film 1. At the same time, the outer diameter (winding diameter) of the roll-shaped film 1 can be accurately measured.
That is, when measuring the outer diameter of the roll-shaped film 1, it is necessary to dispose two parallel light line sensors so as to face each other as a pair of parallel light line sensors. When the outer diameter of the roll-shaped film 1 is measured by using the method, if the winding end 50G of the roll-shaped film 1 is present at the detection target portion, the roll-shaped film 1 is accurately measured.
May not be able to measure the outside diameter. For this reason, when there is a winding end 50G on the surface of the roll-shaped film 1, even if the winding end 50G is detected by one pair of parallel light line sensors, the other pair of parallel light line sensors is used. This is because the outer diameter of the roll film 1 can be accurately measured.

The reason why the parallel light line sensors 2A to 2D are provided not as a pair of parallel light line sensors but as two pairs of parallel light line sensors is that a defect caused by the winding bump (small) 50BB of the roll-shaped film 1 is caused. Is detected on the outer peripheral surface of the roll film 1 at the end of winding 50G [FIG.
(G), so that the winding end 50G is not erroneously determined as the winding edge (small) 50BB. That is, the winding end 50G is generated at one position on the outer peripheral surface of the roll-shaped film 1, whereas the winding hump (small) 50BB is generated over the entire circumference of the roll-shaped film 1. When two or more detection signals (sensor outputs) of the detection signals (sensor signals) of the optical line sensors 2A to 2D are convex in the same phase (that is, the same roll width position) (that is, the rolls having the same detection value are detected). If it is equal to or greater than the predetermined detection value at the width position), it can be considered that the winding edge (small) 50BB.
For this reason, four parallel light line sensors 2A to 2D are provided so that the winding end 50G is not erroneously determined as the winding bump (small) 50BB.

Here, these parallel light line sensors 2A
2D have the same configuration as that of the first embodiment described above, and as shown in FIG. 9, the planar parallel light emitted from the light projector 2a on one end is received by the light receiver 2b on the other end. The light projector 2a is configured to receive the laser light (for example, red laser light) emitted from the visible light semiconductor laser element 2c as parallel light (plane light) S by the light projection lens 2d. Is transmitted through a band-pass filter 2e that transmits only the emitted laser light provided in the light receiver 2b, and is received by a one-dimensional CCD image sensor 2f built in the light receiver 2b. Has become. FIG. 9 shows only a pair of parallel light line sensors 2A and 2C for easy understanding.

When the rolled bump (small) 50BB is present on the surface of the roll-shaped film 1, the parallel light S emitted from the projector 2a is blocked by the rolled bump (small) 50BB.
In the one-dimensional CCD image sensor 2f of the light receiver 2b, a shadow portion where the parallel light S is not irradiated is generated in proportion to the size of the winding edge (small) 50BB. The size and position of the shadow portion are calculated by the CCD image sensor 2f scanning at, for example, 780 times / sec, and the winding edge (small) 5 of the roll-shaped film 1 is calculated.
A detection signal (detection value) corresponding to 0BB is output.

More specifically, if the rolled film 1 has a winding edge (small) 50BB, the position of the parallel light (ie, the lower end position of the parallel light) captured by the CCD image sensor 2f of the light receiver 2b changes. When the position of the parallel light is shifted by a predetermined amount or more, it is determined that there is a defect due to the winding edge (small) 50BB. If the rolled film 1 has a winding edge (small) 50BB, the length of the parallel light captured by the CCD image sensor 2f of the light receiver 2b changes, or the amount of the parallel light changes. For this reason, when the length of the parallel light is less than a predetermined length or when the amount of the parallel light is less than a predetermined amount, it is determined that there is a defect due to the winding bump (small) 50BB. Is also good.

On the other hand, these parallel light line sensors 2A to 2A
In the 2D, the outer diameter of the roll-shaped film 1 is measured at the same time as the detection of the defect due to the winding edge (small) 50BB. That is, as shown in FIG. 9, when the roll film 1 is introduced into the measurement area of the parallel light line sensors 2A to 2D, the parallel light line sensors 2A to 2D emit the parallel light S emitted from the light projector 2a. Is shielded by the roll-shaped film 1, and the one-dimensional CCD image sensor 2 f of the photodetector 2 b has a shadow portion in which the parallel light S is not irradiated by the amount of the light shielded by the roll-shaped film 1. The CCD image sensor 2f, for example,
Calculates by scanning at 80 times / second, and its detection signal (detection value)
To the signal processing device 3.

The position of the parallel light line sensors 2A to 2D with respect to the roll film 1 (for example, the distance between a pair of parallel light line sensors) is stored in advance in the signal processing device 3, The outer diameter of the roll film 1 is measured based on the detection values from the sensors 2A to 2D. For example, the signal processing device 3
Lower end of one-dimensional CCD image sensor 2f of parallel light line sensor 2A and one-dimensional CCD of parallel light line sensor 2C
The distance from the upper end of the image sensor 2f is stored in advance, and the length of the shadowed portion without being irradiated with the parallel light S is calculated based on the detection signals from the one-dimensional CCD image sensors 2f, 2f. Then, the one-dimensional CCD image sensor 2f of the parallel light line sensor 2C whose length is stored in advance.
The outer diameter of the roll-shaped film 1 is measured by adding the distance to the upper end of the roll-shaped film 1. The method for calculating the outer diameter of the roll film 1 is not limited to this.

The other configuration and the method of detecting and detecting defects by this device are the same as those in the first embodiment, and therefore, the description thereof is omitted here. Therefore,
According to the roll film defect detecting apparatus according to the second embodiment of the present invention, in addition to the same effects as those of the above-described first embodiment, a correction in which the detection values from the parallel light line sensors 2A to 2D are corrected. Since the defect caused by the winding edge (small) 50BB generated on the surface of the roll-shaped film 1 is determined based on the detection value, the defect is not erroneously determined.
There is an advantage that the defect of the roll-shaped film 1 can be accurately and reliably detected, and the outer diameter of the roll-shaped film 1 can be accurately measured.

In the above-described second embodiment, four parallel light line sensors 2A to 2D are provided, but the roll film 1 has no winding end 50G (for example, a state in which the winding end 50G is flattened). Rolled film 1)
In order to detect a defect caused by a winding edge, it is only necessary to provide two parallel light line sensors (a pair of parallel light line sensors), thereby detecting the defect by the winding edge (small) 50BB of the roll-shaped film 1. , The outer diameter of the roll-shaped film 1 can be measured.

In the above-described second embodiment, two pairs of parallel light line sensors (four parallel light line sensors) are provided as a pair of two parallel light line sensors. When the outer diameter is large or the installation space can be sufficiently secured, two parallel light line sensors may be paired, and more parallel light line sensors than two pairs may be provided.

In the above-described second embodiment, four parallel light line sensors 2A to 2D are used. However, when the outer diameter of the roll-shaped film 1 is smaller than the inspection range of the parallel light line sensors. Only needs to provide two parallel light line sensors, whereby the defect caused by the winding bump of the roll film 1 can be detected, and at the same time, the outer diameter of the roll film 1 can be measured.

Next, an apparatus and a method for detecting a defect of a rolled film according to a third embodiment of the present invention will be described with reference to FIG. The roll film defect detecting apparatus according to the present embodiment is different from the first embodiment in the number of parallel light line sensors. In this embodiment, the first embodiment is different from the first embodiment in that the roll end of the roll film is 50G. Is provided with only one parallel light line sensor instead of providing three parallel light line sensors in order to prevent erroneous determination as a winding bump (small) 50BB. By making the parallel light line sensor movable in the roll circumferential direction, it is possible to prevent the winding end 50G of the roll-shaped film 1 from being erroneously determined as the winding edge (small) 50BB.

As shown in FIG. 10, this one parallel light line sensor 2A is disposed near the surface of the roll-shaped film 1 so that a defect on the surface of the roll-shaped film 1 can be detected. The detection signal (detection value) of one parallel light line sensor 2A is output to the signal processing device 3. This parallel light line sensor 2A is shown in FIG.
As shown by the arrows, the configuration is such that the periphery of the roll-shaped film 1 can be moved along the roll circumferential direction. As in the case where the parallel light line sensor is provided, it is possible to detect a defect caused by the winding bump (small) 50BB generated on the surface of the roll-shaped film 1.

The parallel light line sensor 2A is further provided with three portions (reference numerals 1 to 3 in FIG. 10) on the surface of the roll film 1.
(Position indicated by), the rolled film 1 is moved in parallel from one end to the other end to detect a defect by the winding edge (small) 50BB. That is, first, the parallel light line sensor 2A performs a parallel movement from one end to the other end of the roll-shaped film 1 at the first position on the surface of the roll-shaped film 1 to detect a defect.
A is rotated to a second position on the surface of the roll-shaped film 1, and is moved in parallel from one end to the other end of the roll-shaped film 1 at the second position to detect a defect. 1 is rotated to the third position on the surface of the first film 1 and the rolled film 1 is moved to the third position.
Is moved in parallel from one end to the other end to detect defects.

Thus, as in the case of the first embodiment described above, one parallel light line sensor 2A is used to wind the winding edge at three locations (positions indicated by symbols in FIG. 10) on the surface of the roll-shaped film 1. A (small) 50BB defect is detected, and each detection signal (detection value) of the parallel light line sensor 2A at these three locations is output to the signal processing device 3.

The other configurations and the method of detecting and detecting defects by this device are the same as those of the first embodiment, and therefore the description thereof is omitted here. In the case of the present embodiment, it is necessary to provide a roll circumferential direction moving means for moving the parallel light line sensor 2A in the roll circumferential direction in addition to the roll width direction moving means for moving the parallel light line sensor 2A in the roll width direction.

Further, the signal processing device 3 converts the respective detection values (detection signals) of the parallel light line sensor 2A detected at three places (positions indicated by symbols in FIG. 10) on the surface of the roll film 1. It is also necessary to take in and synchronize the detection values of the same phase (the same roll width position) to perform signal processing to detect a defect by the winding bump (small) 50BB.

Therefore, according to the apparatus for detecting a defect of a rolled film according to the present embodiment, similarly to the above-described first embodiment, the correction detection by correcting the detection value from one parallel light line sensor 2A is performed. Based on the value, the defect caused by the winding edge (small) 50BB generated on the surface of the roll-shaped film 1 is determined, so that the defect of the roll-shaped film 1 can be accurately and reliably detected without erroneous determination. There is an advantage that can be.

In the third embodiment described above, when detecting defects at three places on the surface of the roll-shaped film 1,
The parallel light line sensor 2A is translated one by one from one end of the roll-shaped film 1 to the other end, but the method of moving the parallel light line sensor 2A is not limited to this. 10, the parallel light line sensor 2A is rotated in the circumferential direction of the roll at the same phase at one end side (at the same roll width position) as shown by the arrow in FIG. FIG.
(Positions indicated by reference numerals in the middle to 〜)), and the parallel light line sensor 2 </ b> A may be sequentially moved in parallel toward the other end of the roll film 1.

In the above-described third embodiment, the winding edge (small) 50BB and the winding end 50G are determined by the winding edge (small) determining section 15C. Roll-shaped film 1 in a state where it is not present (for example, a state where the end of winding 50G is flattened)
In order to detect a defect caused by the winding edge of the roll film, only one or two positions on the outer peripheral surface of the roll film may be inspected by the parallel light line sensor.

In the third embodiment described above, the inspection is performed at three places on the outer peripheral surface of the roll-shaped film by the parallel light line sensor. However, when the diameter of the roll-shaped film is large or the installation space is sufficient. 3 if available
Inspection may be performed at more than one location. In the above-described third embodiment, the inspection is performed at three places on the outer peripheral surface of the roll-shaped film by the parallel light line sensor, but the outer diameter of the roll-shaped film 1 is larger than the inspection range of the parallel light line sensor. If it is small, the inspection may be performed at only one location.

In each of the above-described embodiments, the roll-shaped film is kept stationary, and the parallel light line sensor is moved to detect the defect using the winding edge (small) 50BB. The rolled film may be moved or rotated in a fixed stationary state. Further, the parallel light line sensors 2A to 2D used in each of the above embodiments are not limited to those having the above configuration. In other words, here, the parallel light line sensors 2A to 2C are configured to include a CCD line sensor, but are not limited thereto, and other line sensors in which light receiving elements (sensors) are arranged in a line shape. (For example, a photodiode type line sensor). Moreover, the parallel light line sensors 2A to
2C is designed to receive laser light from a visible light semiconductor laser element by a CCD line sensor,
The type of light to be irradiated is not limited to this. Further, the parallel light line sensors 2A to 2C are provided along the circumferential surface of the roll film 1 with light (for example, of the roll film 1) irradiated from the opposite side of the CCD line sensor with the roll film 1 interposed therebetween. It is sufficient that the surface of the roll-shaped film 1 can be inspected for irregularities by receiving the light irradiating obliquely along the surface. Therefore, as in each of the above-described embodiments, the projector and the receiver are necessarily provided integrally. It is not necessary to configure the light emitting device and the light emitting device and the light receiving device separately.

In each of the above-described embodiments, the CCD line sensor (one-dimensional CCD image sensor) of the parallel light line sensor (parallel light image sensor) performs electrical vertical scanning, and simultaneously moves the parallel light line sensor in the roll width direction. The surface of the roll-shaped film 1 is inspected for the entire surface in the roll width direction by performing horizontal scanning by mechanically moving the roll-shaped film 1. , A light projector is extended over the entire length in the roll width direction, and a sensor built in the light receiver is a two-dimensional CCD image sensor (CCD area sensor) capable of measuring the light intensity distribution of an area over the entire roll width direction of the roll film. The CCD area sensor may be configured to electrically perform vertical scanning and horizontal scanning. A parallel light image sensor having a CCD area sensor among parallel light image sensors having a CCD image sensor is referred to as a parallel light area sensor. As mentioned above,
Another area sensor (for example, a photodiode type area sensor or the like) in which light receiving elements (sensors) are arranged in an area shape may be used. Further, the light irradiated to the CCD area sensor is not limited to the laser light. Further, it is not always necessary to configure the light emitting device and the light receiving device integrally, and the light emitting device and the light receiving device may be configured separately.

In each of the above embodiments, data processing such as opening processing is performed. However, the present invention is not limited to this, and data processing by another method may be performed.

[0094]

As described above in detail, according to the roll film defect detecting apparatus of the present invention, the light irradiated along the surface of the roll film is received by the image sensor. Because the unevenness of the surface of the rolled film is inspected over the entire surface in the roll width direction, it is possible to detect defects accurately and accurately without erroneously detecting the presence or absence of a defect occurring on the surface of the rolled film. There are advantages.

According to the roll film defect detecting device of the present invention, the signal processing device performs a morphological analysis process on the detected value from the image sensor to calculate a baseline, and Based on the correction detection value calculated based on the correction detection value that emphasizes the defect, the defect detection is performed, so that the defect detection can be performed accurately and accurately without erroneously detecting the presence or absence of a defect occurring on the surface of the rolled film. Can be performed.

According to the roll film defect detecting apparatus of the present invention, it is possible to reliably detect the presence or absence of defects caused by winding bumps having a height of about 50 micrometers to about 1000 micrometers on the roll film. There is an advantage that it can be detected. According to the roll film defect detecting apparatus of the present invention, the surface of the roll film is inspected by three or more image sensors, and the defect determination unit calculates each peak calculated by the peak value calculation unit. When the peak value of two or more of the values is equal to or more than the threshold value for peak value determination, it is determined that the roll-shaped film has a defect due to winding bumps. There is an advantage that the presence or absence of a defect due to the winding edge of the roll-shaped film can be accurately and reliably detected without erroneously determining the winding edge.

According to the roll film defect detecting apparatus of the present invention, the image sensor receives the light irradiated on the surface on one end of the diameter of the roll film and the image sensor on the other end. A total of four are provided as a set, two of which receive light irradiated to the roll, and the surface of the roll-shaped film is inspected by these, so that there is no erroneous determination of the presence or absence of a defect due to a winding bump of the roll-shaped film. ,
There is an advantage that the detection can be performed accurately and reliably, and at the same time, the outer diameter of the roll film can be measured accurately.

According to the method for detecting a defect of a roll-shaped film according to the present invention, the light irradiated along the surface of the roll-shaped film is received by an image sensor so that the unevenness on the surface of the roll-shaped film is reduced. Since the inspection is performed over the entire surface in the width direction, there is an advantage that the defect can be detected accurately and accurately without erroneously detecting the presence or absence of a defect occurring on the surface of the roll-shaped film.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a signal processing device provided in a roll-shaped film defect detection device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating an overall configuration of the roll-shaped film defect detection device according to the first embodiment of the present invention, and is a diagram illustrating the roll-shaped film in a side view.

FIG. 3 is a schematic diagram for explaining a configuration of a parallel light line sensor of the roll film defect detection apparatus according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram for explaining the operation of a parallel light line sensor of the roll film defect detection apparatus according to the first embodiment of the present invention.

FIG. 5 is a diagram for explaining a process performed by the signal processing device when a defect due to a winding edge (small) is detected by the roll-shaped film defect detection device according to the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating a defect detection method by the roll film defect detection apparatus according to the first embodiment of the present invention.

FIGS. 7A and 7B are schematic diagrams for explaining a defect and the like detected by the roll-shaped film defect detection device according to the first embodiment of the present invention, wherein FIG. 7A is a band-shaped wrinkle, FIG. C) is a wound, (D) is a vertical wrinkle, (E) is a diagonal wrinkle,
(F) shows the foreign matter, (G) shows the end of winding,
(A), (C), and (F) are schematic sectional views, and (B), (D),
(E), (G) is a schematic front view.

FIG. 8 is a schematic diagram showing an overall configuration of a roll-shaped film defect detection device according to a second embodiment of the present invention.

FIG. 9 is a view for explaining a method of measuring the diameter of a roll-shaped film by the roll-shaped film defect detection device according to the second embodiment of the present invention.

FIG. 10 is a schematic diagram showing the entire configuration of a roll-shaped film defect detection apparatus according to a third embodiment of the present invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 roll film (inspection object) 2A, 2B, 2C, 2D parallel light line sensor (parallel light image sensor) 3 signal processing device (data processing device) 4 display device 11 opening processing unit (morphological analysis processing unit) 12 Correction detection value calculation unit 13 Peak value calculation unit 14 Half value width calculation unit (peak width calculation unit) 15 Defect determination unit 15A Peak value determination unit 15B Half value width determination unit (peak width determination unit) 15C Winding bump (small) determination unit 16 Threshold value storage unit for peak value determination 17 Threshold value storage unit for half-value width determination (threshold value storage unit for peak width determination) 50BA winding knob (large) 50BB winding knob (small) 50G winding end

Claims (8)

[Claims] 1. An image sensor which receives light irradiated along a circumferential surface of a roll-shaped film to inspect unevenness on the surface of the roll-shaped film over an entire surface in a roll width direction, and detection from the image sensor. A signal processing device for detecting the presence or absence of a defect in the roll film based on the value. 2. A morphological analysis unit for calculating a baseline of a detection value from the image sensor, wherein the signal processing device calculates a correction detection value by subtracting the baseline from the detection value from the image sensor. 2. The correction detection value calculation unit according to claim 1, further comprising: a defect detection unit configured to determine whether or not the roll-shaped film has a defect based on the correction detection value calculated by the correction detection value calculation unit. Roll film defect detection device. 3. The signal processing device further includes a peak value calculation unit that calculates a peak value of the correction detection value calculated by the correction detection value calculation unit, wherein the defect determination unit includes the peak value calculation unit. 3. The defect detecting device for a roll-shaped film according to claim 2, wherein the presence or absence of a defect in the roll-shaped film is determined by comparing the peak value calculated by the above with a threshold value for peak value determination. 4. The signal processing device further includes a peak width calculation unit that calculates the width of the peak based on a detection value from the image sensor, wherein the defect determination unit is calculated by the peak value calculation unit. Comparing the peak value with the threshold value for determining the peak value, and comparing the peak width calculated by the peak width calculation unit with the threshold value for determining the peak width. The defect detecting apparatus for a roll-shaped film according to claim 3, wherein the defect is determined. 5. The roll-shaped film according to claim 1, wherein the signal processing device determines a defect caused by a winding bump having a height of about 50 μm to 1000 μm generated in the roll-shaped film. Defect detection equipment. 6. The rolled film is provided with three or more image sensors in the circumferential direction, and the morphological analysis processing section calculates respective baselines of respective detection values from the respective image sensors. The correction detection value calculation unit is configured to calculate each correction detection value by subtracting each of the above baselines from each of the detection values from each of the above image sensors, and The calculation unit is configured to calculate a peak value of each of the correction detection values on the same circumference calculated by the correction detection value calculation unit, and the defect determination unit is calculated by the peak value calculation unit. When two or more peak values among the respective peak values are equal to or greater than a threshold value for peak value determination, it is determined that the roll-shaped film has a defect due to winding bumps. Defect detection apparatus of the rolled film in claim 3. 7. A set of two of the image sensor, one for receiving light irradiated on the surface on one end of the diameter of the roll-shaped film and the other for receiving light irradiated on the surface on the other end of the rolled film. The roll-shaped film according to claim 1, wherein the signal processing device determines whether or not there is a defect in the roll-shaped film and calculates an outer diameter of the roll-shaped film. Defect detection equipment. 8. A step of inspecting unevenness of the surface of the roll-shaped film over the entire surface in the roll width direction by an image sensor that receives light irradiated along the circumferential surface of the roll-shaped film, and detecting the image from the image sensor. Detecting the presence or absence of a defect in the roll-shaped film based on the value.