JP2010032467A - Method and device for inspecting tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of inspecting a tire for efficiently and accurately inspecting a bonding state of a ply such as a carcass ply. <P>SOLUTION: A CCD camera 11 and lighting system 12 are installed on the inner surface 20a side of the tire 20 to be inspected. The surface of an inner liner section 26 is photographed, then the photographed image of the inner surface of the tire is filtering-processed using a Gabor filter. Whether an uneven region which is parallel with the inclination θ<SB>1</SB>of a first belt 23 of the tire 20 and the inclination θ<SB>2</SB>of a second belt 24 and where width w of the contour line is 8-12 mm is detected or not is inspected, thereby determining whether there is a failure of bonding of a belt in the tire 20. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for inspecting affixing defects such as a belt or a spiral reinforcing member after vulcanization / molding of a tire.

In the tire molding process, a belt-shaped member such as a carcass ply or a belt ply, which is a tire component, is formed by bonding a plurality of strip-shaped sheet members cut to a predetermined width along the peripheral surface of the molding drum. It is common. At this time, the adjacent strip-shaped members are joined so that the adjacent strip-shaped members overlap each other by a predetermined amount.
By the way, it has been conventionally performed by a skilled worker to determine whether or not the strip-shaped member is bonded with a predetermined joining width.
On the other hand, a method for automating the above-described determination has been proposed in order to eliminate variations in determination by the operator. Specifically, with the strip-shaped member pasted on the molding drum, while rotating the molding drum, the above joint is photographed and the lap size or gap between the strip-shaped members is calculated using the image data. When the lap dimension is larger than a predetermined width or when a gap is generated, a method of determining a bonding failure (see, for example, Patent Document 1), or disposing a displacement sensor close to the molding drum, A method of detecting the width dimension of the joint, which is the width of the convex region, from the output waveform of the displacement sensor, and determining a bonding failure when the width dimension exceeds a preset allowable range (for example, Patent Document 2) See).
Japanese Patent Laid-Open No. 9-5246 JP 2004-354258 A

By the way, in a general tire, a carcass ply constituting a tire skeleton is arranged on the inner side in the tire radial direction, and an extension direction of the cord is an angle of 20 ° to 70 ° with respect to the tire equator direction on the outer side in the tire radial direction of the carcass ply. A first belt ply crossing the first belt ply is arranged on the outer side in the tire radial direction of the first belt ply, and a second belt in which the extension direction of the cord crosses with the extension direction of the cord of the first belt ply. A ply is placed. Therefore, in the conventional inspection method, each time the carcass ply and the first and second belt plies are attached to the molding drum, it is necessary to inspect the attached state.
The green tire molded on the molding drum is vulcanized and molded in the vulcanization process. At this time, the inner wall of the vulcanization mold whose outer surface is heated while the green tire is pressurized from the inside. Because of the pressure bonding, there is a risk that the ply attachment state will change.

  The present invention has been made in view of conventional problems, and an object of the present invention is to provide a tire inspection method capable of efficiently and accurately inspecting the state of bonding of a ply such as a carcass ply. .

なお、上記ガボール関数Ｇ(x,y)の中心座標は（０，０）で、位相角φがπ/２のとき、Ｇ(x,y)は余弦型となる。
請求項３に記載の発明は、請求項２に記載のタイヤ検査方法において、上記タイヤ内面画像に上記短冊状部材の貼り合わせ部の延長方向と平行な方向に沿ってガボールフィルタリングを施して、予め設定された上記貼り合わせ部の貼り合わせ幅に相当する幅を有する輪郭線を抽出して、上記短冊状部材の貼り合わせ部の延長方向と平行な方向を検出した後、上記検出された方向に沿った、上記貼り合わせ部の周期よりも短い幅の輪郭線を抽出するガボールフィルタリングを施すことを特徴とする。このように、上記貼り合わせ部の延長方向と平行な方向を検出し、この方向をガボールフィルタで抽出する輪郭線の向きとすれば、画像の向きが貼り合わせ部の延長方向の基準となるタイヤ幅方向に対して多少傾いていても、ガボールフィルタで抽出する貼り合わせ部の周期よりも短い幅の輪郭線の向きを正確に設定できるので、貼り合わせ不良の判定精度を向上させることができる。 As a result of intensive studies, the present inventors photographed an image of the tire inner surface side of the tire after vulcanization molding, and from this photographed image, a ply such as a carcass ply or a belt ply used for the tire is taken. If the width of the convex region or concave region parallel to the extending direction of the strip-shaped member or rubber split is detected, it is efficient whether the width of the joint portion of the strip member or rubber split is within the allowable range. The present inventors have found that a good and accurate determination can be made and have arrived at the present invention.
That is, the invention according to claim 1 of the present application is a ply arranged inside a vulcanized and molded tire, cut into a predetermined width, and bonded together a plurality of strip-shaped members along the tire circumferential direction. A method for inspecting a bonding state of a reinforcing member in which a rubber split having a predetermined width is wound in a spiral shape along a circumferential direction of the tire and bonded to each other, the photographing means being installed on the inner surface side of the tire, The inner surface was photographed, and from the photographed tire inner surface image, an uneven region extending in a direction parallel to the extending direction of the bonded portion of the strip-shaped member or the bonded portion of the rubber split was detected, and the detected Based on the width of the uneven region, the bonding failure of the tire is inspected.
The invention according to claim 2 is the tire inspection method according to claim 1, wherein the tire inner surface image is subjected to Gabor filtering along a direction parallel to the extending direction of the bonding portion, and the bonding is performed. A contour line having a width shorter than the period of the portion is extracted to detect the uneven region.
The Gabor filtering is performed by convolving the brightness data of the captured image with a two-dimensional sine Gabor function G (x, y) represented by the following formula, so as to extend the captured image in a specific direction. and extracts contour (edge), the direction of the contour line extracted by the ratio between the frequency f _y of a frequency f _x and y direction of the x direction of the image contained in the section sin is determined, the frequency f width of the contour line to be extracted by the magnitude of the _x or f _y are determined. Also, σx and σy determine the magnitude of the Gabor function G (x, y).

When the Gabor function G (x, y) is centered at (0,0) and the phase angle φ is π / 2, G (x, y) is a cosine type.
According to a third aspect of the present invention, in the tire inspection method according to the second aspect, the tire inner surface image is subjected to Gabor filtering along a direction parallel to an extension direction of the bonded portion of the strip-shaped member, After extracting a contour line having a width corresponding to the set bonding width of the bonding portion, and detecting a direction parallel to the extending direction of the bonding portion of the strip-shaped member, in the detected direction It is characterized by performing Gabor filtering for extracting a contour line having a width shorter than the cycle of the bonded portion. Thus, if a direction parallel to the extending direction of the bonding portion is detected and this direction is the direction of the contour line extracted by the Gabor filter, the orientation of the image serves as a reference for the extending direction of the bonding portion. Even if it is slightly inclined with respect to the width direction, it is possible to accurately set the direction of the contour line having a width shorter than the cycle of the bonded portion extracted by the Gabor filter, so that it is possible to improve the determination accuracy of the bonding failure.

According to a fourth aspect of the present invention, there is provided a ply or predetermined width disposed inside a vulcanized and molded tire, which is cut into a predetermined width and a plurality of strip-shaped members are bonded along the tire circumferential direction. A tire inspection apparatus for inspecting a bonding state of a reinforcing member formed by winding a rubber split in a spiral shape along a tire circumferential direction, and an imaging unit for imaging the inner surface of the tire, and the imaging unit An uneven area detecting means for detecting an uneven area on the inner surface of the tire by performing Gabor filtering on the photographed tire inner surface image, and a bonding state of the ply or the reinforcing member based on a detection result of the uneven area detecting means Determining means for determining whether the ruggedness is good or bad, and the concave / convex area detecting means includes a Gabor filter along a direction parallel to an extending direction of the bonded portion. To extract a contour line having a width shorter than the cycle of the pasting portion and wider than a preset pasting width of the pasting portion. When the uneven area is detected, it is determined that the tire is poorly bonded.
By using the tire inspection apparatus having the above configuration, it is possible to accurately determine whether or not the state of the joint portion of the strip member or the rubber split is normal, so that the inspection efficiency can be improved.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a tire inspection apparatus 10 according to the best mode. In FIG. 1, 11 is a CCD camera which is a photographing means, 12 is an illumination device, 13 is a tire rotating device, and 14 is an image processing means. , 15 is a Gabor filter creation means, 16 is a filtering means, and 17 is a determination means.
A tire 20 as a subject includes a carcass ply 22 straddling a pair of bead cores 21 </ b> C arranged in a bead portion 21 in a toroidal shape, and first and second tires arranged on the outer side in the tire radial direction of the carcass ply 22. Belt layers 23, 24, a tread 25 made of a rubber member (tread rubber) disposed on the outer side in the tire radial direction of the first and second belt layers 23, 24, and the inner side in the tire radial direction of the carcass ply 22. And an inner liner portion 26 provided on the inner surface 20a side of the tire 20. The carcass ply 22 and the first and second belt layers 23 and 24 are formed by covering a still cord or an organic fiber cord with a rubber member, and cutting each of the strip-shaped members cut into a predetermined width into a tire circumference. It is configured to be bonded at a predetermined angle with respect to the direction. In this example, the angles are 90 ° for the carcass ply 22, + 45 ° for the first belt layer 23, and −45 ° for the second belt layer 24.
The tire rotation device 13 includes a turntable 13a on which the tire 20 is mounted, a motor 13M that drives and rotates the turntable 13a, a rotation angle detection sensor 13b installed near the turntable 13a, and the rotation angle detection. Motor control means 13c for driving and controlling the motor 13M based on the output of the sensor 13b is provided. The tire 20 is mounted on the turntable 13a so that the central axis thereof coincides with the rotation axis of the turntable 13a.
The CCD camera 11 and the illuminating device 12 are installed on the tire inner surface 20 a side located on the radial inner side of the tread 25 of the tire 20 and photograph the surface of the inner liner portion 26. Specifically, the CCD camera 11 is installed on the central axis of the tire inner surface 20a, and the illuminating device 12 is installed so that the irradiation light irradiates the photographing area of the CCD camera 11 from an oblique direction.

The image processing means 14 creates a tire inner surface image based on the image of the tire inner surface 20a taken by the CCD camera 11 and the angle information from the rotation angle detection sensor 13b.
The Gabor filter creating means 15 is used for convolving the photographed tire inner surface image (two-dimensional image) on the basis of the inclinations θ ₁ and θ ₂ of the first and second belt layers 23 and 24 set in advance. Set a constant for the Gabor function. Specifically, setting the frequency f _y in the x direction of the frequency f _x and y directions for extracting contour lines of a specific width w extending in a specific direction from the inner surface of the tire image (edge). At this time, as the specific width w, the overlapping width of the first and second belt layers 23 and 24 set in advance is w _0, and the total width of the first and second belt layers 23 and 24 is W _0. In this case, w ₀ <w <W ₀ is set.
The filtering means 16 filters the tire inner surface image using the Gabor filter created by the Gabor filter creating means 15 and extends it in a direction parallel to the inclinations of the first and second belt layers 23, 24. The concavo-convex areas having the specific width w are extracted.
The determination means 17 performs binarization processing on the filtered image to remove unnecessary noise components, and the unevenness extending in a direction parallel to the inclinations of the first and second belt layers 23 and 24. When an uneven region having a region width equal to the specific width w is extracted, it is determined that the tire 20 is a defective belt bonding product.

なお、本例では、ガボール関数Ｇ(x,y)を、位相φがπ/２の余弦型とした。
また、上記式のσx，σyを適宜決定することで、上記輪郭線の幅ｗに幅を持たせることができる。すなわち、上記輪郭線の幅ｗは、ｗ−Δｗ〜ｗ＋Δｗの範囲にある。本例では、上記輪郭線の方向が第１のベルト層２３の延長方向で、上記輪郭線の幅ｗが８ｍｍ〜１２ｍｍとなるように、ｆ_x，ｆ_yを設定した。
上記撮影されたタイヤ内面画像は、フィルタリング手段１６の図示しないフィルタ処理部に送られ、ＤＣ成分を除去する前処理を施された（ステップＳ１４）後、上記ガボールフィルタ作成手段１５で作成されたガボールフィルタを用いてフィルタリング処理される（ステップＳ１５）。図４（ａ）は１次元ガボール関数Ｇ(ξ)の一例を示す図で、図４（ｂ）は、これをタイヤ内面画像と重ね合わせた図である。図４（ｂ）の白い楕円がガボール関数の値が正の部分、斜線で囲った楕円が負の部分、その他の部分は０である。
フィルタリングは、上記タイヤ内面画像における各座標(p,q)での輝度Ｉ(p,q)をガボール関数Ｇ(x-p,y-q)で畳み込んで、上記輪郭線方向の成分の輝度Ｃ(x,y)を算出することにより、所定の方向に延長する所定幅ｗの輪郭線を抽出することができる。このフィルタ処理されたタイヤ内面画像のデータは判定手段１７に送られる。
当該タイヤ２０において、第１のベルト層２３にベルト貼り合わせ不良がない場合には、図５（ａ）に示すように、上記ガボールフィルタ処理された画像にはノイズしか残らない。一方、第１のベルト層２３にベルト貼り合わせ不良がある場合には、図５（ｂ）に示すように、第１のベルト層２３の延長方向に平行な、輪郭線の幅ｗがｗ−Δｗ〜ｗ＋Δｗの範囲にある凹凸領域が抽出される。
判定手段１７では、上記ガボールフィルタ処理された画像に２値化処理を施して（ステップＳ１６）、不要なノイズ成分を除去したタイヤ内面画像について、上記第１のベルト層２３の傾きと平行な方向に延長する幅が上記特定幅ｗの凹凸領域が抽出されたかどうかを判定する（ステップＳ１７）。そして、上記凹凸領域が抽出されなかった場合には、当該タイヤ２０には第１のベルト層２３の貼り合わせ不良はないと判定し、上記凹凸領域が抽出された場合には、当該タイヤ２０をベルト貼り合わせ不良品であると判定する。 Next, the tire inspection method according to the present invention will be described with reference to the flowchart of FIG. Here, a case where the bonding state of the first and second belt layers 23 and 24 is inspected will be described.
First, a tire 20 as a subject is attached to a predetermined position of the turntable 13a (step S11), and the surface of the inner liner portion 26 is imaged by the CCD camera 11 (step S12). FIG. 3 is a schematic diagram showing an example of a photographed tire inner surface image, in which the horizontal direction is the tire circumferential direction and the vertical direction is the tire width direction. Since the rubber member constituting the inner liner portion 26 is thin, the bonding portion 22k of the carcass ply 22 and the first belt layer 23 are bonded to the surface of the inner liner portion 26 as shown by the arrows in FIG. The portion 23k and the bonding portion 24k of the second belt layer 24 appear as an uneven region. Note that reference numeral 27 in the figure denotes irregularities called ridges provided to prevent air accumulation during vulcanization and to manufacture a uniform tire.
In the Gabor filter creating means 15, the inclination of the first belt layer 23 set in advance, that is, the angle θ ₁ formed by the extending direction of the strip-shaped member constituting the first belt layer 23 and the tire width direction is set. based on, setting the frequency f _y of the Gabor function G (x, y) frequency f _x and y direction of the x direction of the image contained in the section sin of indicated by the following formula (step S13). The ratio between the frequencies f _x and the frequency f _y becomes the direction of the contour line extracted with Gabor filters, the width w of the outline by the magnitude of the frequency f _x or f _y.

In this example, the Gabor function G (x, y) is a cosine type having a phase φ of π / 2.
Further, by appropriately determining σx and σy in the above formula, the width w of the contour line can be given a width. That is, the width w of the contour line is in the range of w−Δw to w + Δw. In this example, the direction of the contour in the extending direction of the first belt layer 23, the width w of the contour so that the 8 mm to 12 mm, setting the f _x, f _y.
The photographed tire inner surface image is sent to a filter processing unit (not shown) of the filtering unit 16 and preprocessed to remove the DC component (step S14), and then the Gabor created by the Gabor filter creating unit 15 is used. A filtering process is performed using the filter (step S15). FIG. 4A is a diagram showing an example of the one-dimensional Gabor function G (ξ), and FIG. 4B is a diagram in which this is superimposed on the tire inner surface image. The white ellipse in FIG. 4B is a portion where the value of the Gabor function is positive, the ellipse surrounded by a diagonal line is a negative portion, and the other portions are zero.
Filtering is performed by convolving the luminance I (p, q) at each coordinate (p, q) in the tire inner surface image with the Gabor function G (xp, yq), and the luminance C (x, x, By calculating y), a contour line having a predetermined width w extending in a predetermined direction can be extracted. The filtered tire inner surface image data is sent to the determination means 17.
In the tire 20, when there is no belt bonding failure in the first belt layer 23, as shown in FIG. 5 (a), only noise remains in the image subjected to the Gabor filter processing. On the other hand, when the first belt layer 23 has poor belt bonding, as shown in FIG. 5B, the width w of the contour line parallel to the extending direction of the first belt layer 23 is w−. An uneven area in the range of Δw to w + Δw is extracted.
The determination means 17 performs a binarization process on the Gabor filter-processed image (step S16), and a direction parallel to the inclination of the first belt layer 23 with respect to the tire inner surface image from which unnecessary noise components are removed. It is determined whether or not the uneven region having the specific width w is extracted (step S17). And when the said uneven | corrugated area | region is not extracted, it determines with the said tire 20 having no bonding defect of the 1st belt layer 23, and when the said uneven | corrugated area | region is extracted, the said tire 20 is used. It is determined that the belt is not bonded properly.

In step S18, it is determined whether or not the bonding failure determination of the second belt layer 24 is completed. Here, since only the determination of the bonding failure of the first belt layer 23 has been completed, the process returns to step S13 and the above-mentioned Gabor is based on the preset inclination θ ₂ of the second belt layer 24. frequency f _x of the function G (x, y), after resetting and f _y, in step S14, the filtering process the inner surface of the tire image using Gabor filters created by the Gabor filter creation unit 15. The filtered tire inner surface image data is sent to the determination means 17. In the determination means 17, it is determined whether or not an uneven area having a width of the uneven area extending in the direction parallel to the inclination of the second belt layer 24 is the specific width w is extracted (steps S15 to S17). ). And when the said uneven | corrugated area | region is not extracted, it determines with the said tire 20 not having a bonding defect also in the 2nd belt layer 24. FIG. When the uneven area is extracted, it is determined that the tire 20 is a defective belt bonding product.
If there is no bonding failure in both the first and second belt layers 23 and 24, it is determined whether or not the inspection for one round of the tire has been completed (step S19). Here, since it is the first measurement, the inspection for one round of the tire is not completed. Therefore, it progresses to step S20, the rotation apparatus 13 is operated, and only the predetermined angle of the turntable 13a is rotated. After the tire 20 stops at the next measurement location, the process returns to step S12 and a tire inner surface image of the next location is taken. If there is a bonding failure in the first and second belt layers 23 and 24, the inspection of the tire 20 is finished on the spot and the next tire is inspected.
The above operation is performed over the entire circumference of the tire inner surface 20a, and the bonding failure of the first and second belt layers 23 and 24 of the tire 20 is determined.

As described above, according to the present embodiment, the CCD camera 11 and the illuminating device 12 are installed on the inner surface 20a side of the tire 20 that is the subject, and the surface of the inner liner portion 26 is imaged. the inner surface of the tire image filtering processing using a Gabor filter, in parallel with the inclination theta ₂ of the first inclination belt layer 23 theta ₁ and the second belt layer 24 of the tire 20, and the width w of contours Since it is determined whether or not there is a belt bonding failure in the tire 20 by investigating whether or not an uneven region such as 8 mm to 12 mm is detected, the belt bonding failure of the tire 20 is surely confirmed. Can be detected.

In the above-described embodiment, the bonding failure of the first and second belt layers 23 and 24 has been described. However, the present invention is not limited to this, and the bonding failure of the carcass ply 22 described above, The present invention can also be applied to detection of a bonding failure of a spiral reinforcing layer member, which is disposed on the outer side in the tire radial direction of the second belt layer 24 and is formed by winding a rubber split having a predetermined width in a spiral shape.
Moreover, in the above example, the poor bonding of the first and second belt layers 23 and 24 is determined using the tire inner surface image taken at every predetermined rotation angle, but the tire is rotated as the tire inner surface image. In addition, an image obtained by photographing a slit image on the tire inner surface by irradiating the inner surface of the tire with slit light may be used.
In the above example, the inclinations θ ₁ and θ ₂ of the first and second belt layers 23 and 24 are set to predetermined values (inclinations at the time of design), but the inclinations θ ₁ and θ ₂ are set to the tires. The inner surface image may be obtained by filtering using a Gabor filter. In this case, the width w of the contour to be set is set to 1 mm to 2 mm, which is a standard value for belt bonding. As a result, even when the inclinations θ ₁ and θ ₂ deviate from the design values, it is possible to reliably detect a belt bonding failure.
Further, in the above example, an uneven region in which the width w of the contour line is 8 mm to 12 mm was detected. However, by increasing the width w of the contour line to 5 mm to 15 mm, a bonding error or misalignment with a small shift was detected. Even a large bonding failure can be reliably detected. If the width w of the contour line is set in a plurality of stages, for example, 5 mm to 8 mm, 8 mm to 12 mm, 12 mm to 15 mm, and the Gabor filter processing is performed on the width w of each contour line, the contour is simply The detection accuracy of belt bonding failure can be increased as compared with the case where the line width w is 5 mm to 15 mm.

  As described above, according to the present invention, it is possible to efficiently and accurately carry out the inspection of the bonding state of the ply such as the belt ply and the carcass ply, so that the inspection process can be shortened and the tire quality can be reduced. Can be improved.

It is a figure which shows the structure of the tire inspection apparatus which concerns on the best form of this invention. It is a flowchart which shows an example of the tire inspection method by this invention. It is a schematic diagram which shows an example of a tire inner surface image. It is a figure for demonstrating the filtering process using a Gabor filter. It is a figure which shows the example of the tire inner surface image after reverse conversion.

Explanation of symbols

10 tire inspection device, 11 CCD camera, 12 lighting device,
13 tire rotation device, 13a turntable, 13b rotation angle detection sensor,
13c motor control means, 13M motor, 14 image processing means,
15 Gabor filter creation means, 16 filtering means, 17 determination means,
20 pneumatic tire, 21 bead part, 21C bead core,
22 carcass ply, 22k, 23k, 24k bonding part,
23 first belt layer, 24 second belt layer, 25 tread,
26 Inner liner part.

Claims (4)

  A ply or a rubber split with a predetermined width spiraled along the tire circumferential direction, which is placed inside the vulcanized and molded tire, cut into a predetermined width and bonded together in the tire circumferential direction. A method of inspecting the bonding state of the reinforcing member wound and bonded in a shape, the photographing means is installed on the inner surface side of the tire to photograph the inner surface of the tire, from the photographed tire inner surface image Detecting an uneven region extending in a direction parallel to the extending direction of the bonded portion of the strip-shaped member or the bonded portion of the rubber split, and bonding the tire based on the width of the detected uneven region A tire inspection method characterized by inspecting for defects.   Gabor filtering is performed on the tire inner surface image along a direction parallel to the extending direction of the bonded portion, and a contour line having a width shorter than the cycle of the bonded portion is extracted to detect the uneven region. The tire inspection method according to claim 1, wherein:   Gabor filtering is performed on the tire inner surface image along a direction parallel to the extending direction of the bonded portion of the strip-shaped member, and a contour line having a width corresponding to a preset bonding width of the bonded portion is formed. After extracting and detecting a direction parallel to the extending direction of the bonded portion of the strip-shaped member, a Gabor that extracts a contour line having a width shorter than the cycle of the bonded portion along the detected direction. The tire inspection method according to claim 2, wherein filtering is performed.   A ply or a rubber split with a predetermined width spiraled along the tire circumferential direction, which is placed inside the vulcanized and molded tire, cut into a predetermined width and bonded together in the tire circumferential direction. A tire inspection apparatus for inspecting a bonding state of a reinforcing member that is wound in a shape and bonded together, and imaging means for photographing the inner surface of the tire, and applying Gabor filtering to a tire inner surface image photographed by the photographing means An uneven area detecting means for detecting an uneven area on the inner surface of the tire, and a determining means for determining the quality of the bonded state of the ply or the reinforcing member based on the detection result of the uneven area detecting means, The concavo-convex area detecting means performs Gabor filtering along a direction parallel to the extending direction of the bonding portion, and the bonding portion A contour line that is shorter than the cycle and wider than the preset bonding width of the bonding portion is extracted, and the determination unit detects the tire when the uneven region detection unit detects the uneven region. A tire inspection apparatus that determines that the bonding is defective.

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