JP2009186281A - Method and device for inspecting flaw of glass article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately inspect the presence of the flaw ranging over the whole periphery of a cylindrical or columnar glass article and to certainly shorten an inspection time by dispensing with the rotation of the glass article centering around its axis at the time of inspection of the flaw. <P>SOLUTION: A glass pipe 2 is irradiated with line light 3 from a floodlight projection part 4 so as to traverse the glass pipe 2, the reflected light from it out of the irradiated line light 3 is received by a light receiving part 5 and the presence of the flaw of the glass pipe 2 is inspected on the basis of a change in the receiving quantity of the reflected light. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for inspecting a glass article having a cylindrical or columnar shape for defects.

  As is well known, a cylindrical glass tube is usually manufactured by cutting a long glass base material into a predetermined length. The long glass base material is formed by winding the molten glass drawn from the melting furnace around a long cylindrical refractory (sleeve) and drawing it at a high speed into a tubular shape, or drawing from the melting furnace. A technique of drawing the molten glass into a tubular shape, such as a down draw method in which the molten glass is made to flow downward and drawn into a tubular shape, is used.

  Therefore, the foam generated in the melting process (clarification process) and the molding process is a process in which the molten glass is stretched to form a glass base material, and the streaks are stretched in the axial direction (longitudinal direction) on the glass base material. Formed as bubbles. And the glass tube manufactured by cut | disconnecting the glass base material which has such a bubble may become a defect product because the said bubble becomes a defect.

  In addition, glass tubes manufactured by cutting a glass base material having foreign matters (undissolved or devitrified beads) generated in the melting process or molding process may be defective due to the foreign matters. .

  Therefore, it is important to provide a high-quality glass tube by accurately inspecting the presence or absence of defects due to bubbles and foreign matters as described above and selecting a glass tube free from the problematic defect. In particular, when a glass tube is used for a backlight of a liquid crystal display, the presence of the defects described above can cause a problem such as deterioration of image quality if the above-described defects exist in the glass tube. It is even more important to conduct inspections.

  Therefore, in Patent Document 1 below, the surface of a cylindrical glass tube is irradiated with a spot-like laser beam and the scattered light scattered in the direction perpendicular to the axis of the glass article is detected. Thus, a technique for detecting the presence or absence of bubbles contained in a glass article is disclosed.

  Further, in Patent Document 2 below, a laser beam in the form of a spot is irradiated perpendicularly to the surface of a cylindrical glass article, and the scattered light scattered in the glass article is projected on a screen and projected. Disclosed is a method for detecting the presence or absence of bubbles or foreign substances contained in a glass article based on the shape of the image.

And when these two methods irradiate light to the surface of a glass article perpendicularly, and a bubble is contained in a glass tube, the laser beam with which the bubble was irradiated with respect to the axis of a glass tube This is based on the knowledge that if the glass tube scatters only in the vertical direction and a foreign material is contained in the glass tube, the laser light applied to the foreign material scatters uniformly without directivity.
Japanese Patent Laid-Open No. 11-64231 JP-A-11-258167

  By the way, the method disclosed in any of the above Patent Documents 1 and 2 is limited to a region where the path of light propagating inside the glass tube is extremely small because the glass tube is irradiated with spot-like light. . Therefore, when it is attempted to inspect the presence or absence of a defect over the entire circumference of the glass tube, it is necessary to rotate the glass tube around its axis and scan spot-like light around the glass tube.

  However, in this case, troublesome and complicated work is forced to rotate the glass tube. In particular, it is difficult to accurately perform defect inspection over the entire circumference of the glass tube by rotating the glass tube at a high speed. Therefore, it is necessary to rotate the glass tube slowly to scan the spot-like light around the glass tube, and a long time is required for the inspection. And considering the fact that glass tubes are manufactured in large quantities in a short time in recent years, it takes a long time to inspect glass tubes for defects, which results in a decrease in glass tube production efficiency. It becomes a problem in practical use.

  In addition, although the above demonstrated the defect inspection of a cylindrical glass tube, the same problem may arise also when performing the defect inspection of a cylindrical glass column.

  The present invention has been made in view of the above circumstances, accurately inspecting the presence or absence of defects over the entire circumference of a cylindrical or columnar glass article, and centering on the axis of the glass article during the defect inspection. The technical problem is to reliably reduce the inspection time by eliminating the need for rotation.

  The defect inspection method for a glass article according to the present invention, which was created in order to solve the above problems, irradiates the line-shaped light so as to traverse the cylindrical or columnar glass article from the light projecting portion, and the irradiation is performed. Of the light, reflected light reflected by the glass article is received by a light receiving unit, and the presence or absence of a defect in the glass article is inspected based on a change in the amount of received light.

  According to such a method, since light in a line shape is irradiated so as to cross the glass article from the light projecting unit, the light propagates over the entire circumference of the glass article without rotating the glass article. . Therefore, of the line-shaped light irradiated in this way, the reflected light reflected by the glass article includes information on defects over the entire circumference of the glass article.

  When the glass article has a defect due to air bubbles, in addition to the reflected light generated when there is no defect in the glass article, reflected light reflected at the interface between the glass portion of the glass article and the air bubbles (gas) is also generated. Therefore, when there is a bubble, these two reflected lights are received by the light receiving unit, and the received light amount of the reflected light received by the light receiving unit changes. Therefore, the presence or absence of bubbles can be accurately inspected based on the change in the amount of received light of the reflected light reflected by the glass article.

  On the other hand, when the glass article has a defect due to a foreign substance, the reflected light generated when the glass article has no defect is scattered and weakened by the foreign substance, and the received light amount of the reflected light received by the light receiving unit changes. Therefore, the presence or absence of foreign matter can be accurately inspected based on the change in the amount of received light of the reflected light reflected by the glass article.

  In said method, it is preferable to irradiate a linear light from the said light projection part along the plane orthogonal to the axial center of the said glass article.

  In this way, the line-shaped light emitted from the light projecting part mainly reflects on a plane orthogonal to the axis of the glass article, so that the light line is irradiated from the light projecting part. By arranging in the same plane as the shaped light, the reflected light reflected by the glass article can be received efficiently. That is, since a sufficient amount of reflected light can be easily received by the light receiving unit, it is advantageous in improving inspection accuracy.

  In the above method, the light receiving unit is disposed at a position excluding an optical path of transmitted light that travels straight through the glass article out of the line-shaped light irradiated to the glass article from the light projecting unit. Preferably it is.

  In this way, since the transmitted light that travels straight through the glass article is not received by the light receiving unit, the change in the amount of received light of the reflected light reflected by the glass article becomes clearer, and the presence or absence of defects can be accurately detected. It will be advantageous.

  In said method, it is preferable to irradiate a linear light from the said light projection part, moving the said glass article to an axial center direction.

  In this way, since the line-shaped light is scanned in the axial direction of the glass article, it is possible to inspect the entire glass article for defects. In addition, when the defect of the glass article is a bubble, the length of the bubble in the axial direction can be measured. Therefore, it is possible to distinguish only a glass article having bubbles of a predetermined length or more as a defective product. Although it depends on the application of the glass article, there are many cases where it is not necessary to regard the defect as long as it is a bubble with a length of less than 1 mm, and it is practically possible to measure the axial length of the bubble in this way. This is extremely advantageous. In this case, since it is not necessary to rotate the glass article around its axis for the reasons already described, the glass article is a long glass base material continuous with the molten glass. By irradiating the solidified portion with line-shaped light, it is possible to sequentially inspect for the presence or absence of defects.

  In the above method, it is preferable to arrange a plurality of the light projecting portions and irradiate the glass article with linear light from different directions.

  In this way, since the glass article is irradiated with line-shaped light from different directions, the change in the amount of received light due to a defect is small when light is irradiated from a specific direction. However, a significant change in the amount of received light due to the defect can be obtained by the light irradiated from other directions. Therefore, it is possible to reduce the rate of overlooking defects contained in the glass article and realize more accurate defect inspection.

  In the above method, when the defect to be detected of the glass article is a bubble, the light receiving unit detects the intensity distribution of the received light amount of the reflected light, and based on the detected change in the intensity distribution of the received light amount It is preferable to inspect the presence or absence of bubbles contained in the glass article.

  As described above, when light is irradiated to the bubbles, reflection occurs at the interface between the glass portion of the glass article and the bubbles. In many cases, the reflected light reflected by the bubbles is received at a position slightly deviated from the position at which the reflected light generated even when the glass article has no defect. In addition, even if the position where the reflected light reflected by the bubble is received and the position where the reflected light generated even when there is no defect in the glass article overlap, the portion where the reflected light overlaps Increases the amount of received light. Therefore, if the intensity distribution of the received light amount of the reflected light received by the light receiving unit is detected, the presence or absence of bubbles contained in the glass article can be accurately inspected.

  In the above method, when the defect to be detected of the glass article is a foreign object, the line-shaped light irradiated from the light projecting unit of the light receiving unit corresponds to the axial direction of the glass article. The range in which light can be received is limited in accordance with the thickness of the glass article in the axial direction of the line-shaped light irradiated from the light projecting unit, and the amount of received light of the reflected light received by the light receiving unit is reduced. It is preferable to inspect for the presence or absence of foreign matter contained in the glass article.

  As described above, when light is irradiated to a foreign material, the light is scattered and weakened by the foreign material. Therefore, when the reflected light generated even when the glass article has no defect is irradiated again on the foreign matter in the glass article, the reflected light corresponding to the portion irradiated with the foreign matter is weakened by scattering. At this time, the light scattered by the foreign matter diffuses and spreads in all directions. Therefore, among the light receiving parts, the light receiving range in the direction corresponding to the axial direction of the line-shaped light glass article irradiated from the light projecting part is the same as that of the line-shaped light glass article irradiated from the light projecting part. By limiting according to the thickness in the axial direction, a part of the reflected light diffused by the foreign matter is not received by the light receiving unit. As a result, it is possible to more clearly detect a change in the amount of reflected light due to the foreign matter, which is advantageous for accurately inspecting the presence or absence of the foreign matter.

  An inspection apparatus for a glass article according to the present invention, which was created to solve the above-described problems, includes a light projecting section that irradiates line-shaped light so as to cross a cylindrical or columnar glass article, and the light projecting section. A light receiving unit that receives reflected light reflected by the glass article among the light emitted from the light source, and a determination that determines whether there is a defect in the glass article based on a change in the amount of received light of the reflected light received by the light receiving unit It is characterized by having a department.

  According to such a configuration, the effects described in the paragraphs [0014] to [0016] already described can be similarly enjoyed.

  As described above, according to the inspection method and the inspection apparatus for glass articles according to the present invention, since the line-shaped light is irradiated so as to cross the glass article, the glass article is centered on its axis. Even if it is not rotated, the presence or absence of defects over the entire circumference of the glass article can be inspected. Therefore, since the time required for the rotation of the glass article can be omitted, the inspection time can be greatly shortened. Of the line-shaped light irradiated in this way, the reflected light reflected by the glass article contains information on defects over the entire circumference of the glass article. If a change in the amount of received light is detected, it is possible to accurately inspect for the presence or absence of defects over the entire circumference of the glass article.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing a defect inspection apparatus according to the first embodiment of the present invention. The defect inspection apparatus 1 includes a light projecting unit 4 that irradiates a line-shaped light (line light) 3 so as to cross a cylindrical glass tube 2, and glass out of the line light 3 irradiated from the light projecting unit 4. A light receiving unit 5 that receives the reflected light reflected by the tube 2 and a determination unit 6 that determines the presence or absence of a defect in the glass tube 2 based on a change in the amount of received light of the reflected light received by the light receiving unit 5 are provided. .

  More specifically, the light projecting unit 4 is composed of a line light source arranged so as to irradiate the line light 3 along a plane orthogonal to the axis of the glass tube 2. That is, when X is an axis of the glass tube 2 and Y and Z are axes in a plane orthogonal to the axis X and orthogonal to each other as shown in the figure, the light projecting unit 4 is, for example, an axis The glass tube 2 is irradiated with line light 3 wider than the outer diameter of the glass tube 2 in the Z direction from the direction of the axis Y (direction perpendicular to the axis X of the glass tube 2). . This is to prevent the line light 3 irradiated to the glass tube 2 from being refracted in the direction of the axis X on the surface of the glass tube 2. That is, the reflected light reflected by the glass tube 2 is mainly spread in a plane orthogonal to the axis X. The line light 3 irradiated in this way is wider than the outer diameter of the glass tube 2, so that it is irradiated so as to cross the glass tube 2.

  The light receiving unit 5 is arranged in the same plane as the line light 3 irradiated from the light projecting unit 4 so as to receive reflected light that is reflected by the glass tube 2 and spreads in a plane orthogonal to the axis X. It has become. As shown in FIG. 2, the light receiving unit 5 arranged in the same plane as the line light 3 in the glass tube 2 out of the line light 3 irradiated to the glass tube 2 from the light projecting unit 4. Is disposed at a position excluding the optical path of transmitted light that travels straight through. Specifically, the optical axis center L1 of the line light 3 irradiated from the light projecting unit 4 and the optical axis center L2 of the reflected light received by the light receiving unit 5 intersect at the axis X of the glass tube 2. The angle θ formed by both optical axes L1 and L2 is set within a range of 100 ° to 150 °. This is to prevent the light receiving unit 5 from receiving the transmitted light that travels straight through the glass tube 2 and to easily detect the change in the amount of received light reflected by the glass tube 2.

  Further, the light receiving unit 5 is constituted by a line sensor, and can detect the intensity distribution of the amount of received light of the reflected light within the light receiving surface. And the judgment part 6 judges the presence or absence of the defect of the glass tube 2 based on the change of the received light received light quantity, ie, the change of the intensity distribution of received light quantity in this embodiment.

  Next, a defect inspection method for the glass tube 2 using the defect inspection apparatus 1 according to the first embodiment configured as described above will be described. In the following, the glass tube 2 is manufactured by cutting a long glass base material formed by the Danner method or the like into a predetermined length, and the defect to be inspected is a streak shape extending in the axial direction. An example of the case of bubbles will be described.

  First, as shown in FIG. 2, when the line light 3 is irradiated from the light projecting unit 4 to the glass tube 2, the line light 3 propagates so as to cross the glass tube 2. When the glass tube 2 has no defects such as bubbles, the irradiated line light 3 is reflected by the outer surface and the inner surface of the glass tube 2 to generate reflected light. Then, when the reflected light is received by the light receiving unit 5 arranged at an angle as described above with respect to the optical axis center L1 of the line light 3 irradiated from the light projecting unit 4, and the received light amount is detected. For example, near the point A on the outer surface on the light receiving unit 5 side, near the point B on the inner surface on the light receiving unit 5 side, near the point C on the inner surface on the opposite side to the light receiving unit 5, and outside on the side opposite to the light receiving unit 5 Four peaks (A to D) corresponding to the reflected light reflected near the point D on the surface are detected as shown in FIG. In addition, A point is a point from which the incident angle to the outer surface of the glass tube 2 of the line light 3 irradiated from the light projection part 4 and a reflection angle become the same. The points B to D are basically the same as the point A although the reflected light is refracted on the inner and outer surfaces of the glass tube 2 while the reflected light travels toward the light receiving unit 6 and is slightly shifted. Therefore, the points A to D are intersections between the bisector L3 of the angle θ formed by the optical axis center L1 and the optical axis center L2 and the inner and outer surfaces of the glass tube 2.

  On the other hand, when there are bubbles in the glass tube 2, as shown in FIG. 4, the intensity distribution (hereinafter referred to as a reference intensity distribution) of the received light amount of the reflected light having the four peaks A to D as described above, A peak E due to the reflected light reflected at the boundary surface between the glass portion of the glass tube 2 and the bubble is added and detected.

  Therefore, when there are bubbles in the glass tube 2, the intensity distribution detected by the light receiving unit 5 changes from the reference intensity distribution when there is no defect such as bubbles. Therefore, the presence / absence of bubbles can be accurately inspected by comparing the reference intensity distribution with the newly detected intensity distribution by the determination unit 6.

  At this time, since the line light 3 is irradiated from the light projecting unit 4 so as to cross the glass tube 2, the reflected light reflected by the glass tube 2 includes information on defects over the entire circumference of the glass tube 2. Will be. Accordingly, since it is possible to inspect the presence or absence of bubbles over the entire circumference of the glass tube 2 without rotating the glass tube 2, the time required for the rotation operation of the glass tube 2 is omitted, and the inspection time is shortened. Can be achieved reliably. In addition, since the presence or absence of bubbles can be inspected without rotating the glass tube 2, it is possible to continuously inspect on a tube drawing line such as the Dunner method or the down draw method.

  In the defect inspection method as described above, from the viewpoint of further improving the bubble detection accuracy, a plurality of light projecting portions 4 are arranged in the circumferential direction of the glass tube 2 (for example, three by shifting 120 ° in the circumferential direction). It is preferable to irradiate the line light 3 from different directions with respect to the glass tube 2. If the line light 3 is irradiated to the glass tube 2 from different directions, even if the line light 3 is irradiated from one specific direction, even if the change in the intensity distribution of the received light amount due to the bubbles is small This is because the line light 3 irradiated from other directions can cause a remarkable change in the intensity distribution of the amount of received light due to the bubbles.

  Further, in this case, the plurality of light projecting portions 4 are arranged in a spiral shape with the axis X of the glass tube 2 as the center, and the individual light projecting portions 4 are arranged in the direction of the axis X of the glass tube 2 and in the periphery. It is preferable to dispose in the direction. Thereby, even when light is simultaneously irradiated from all the light projecting units 4 to the glass tube 2, the line light 3 irradiated from one light projecting unit 4 is a line irradiated from the other light projecting unit 4. The situation of interference with the light 3 can be suppressed. Therefore, it is possible to more reliably reduce the inspection time while preventing the inspection accuracy from being reduced due to the mutual interference of the plurality of line lights 3.

  Further, the defect inspection method described above may be executed while moving the glass tube 2 in the direction of the axis X. In this way, the presence or absence of bubbles contained in the entire glass tube 2 can be inspected. In addition, since the length of the bubble in the direction of the axis X can also be measured, only the glass tube 2 having bubbles of a predetermined length (for example, 1 mm) or more is distinguished as a defective product. Is also possible.

  In this case, as shown in FIG. 5, the glass tube 2 is placed on a plurality of rollers 7 arranged intermittently on a straight line and conveyed in the direction of the axis X. It is preferable to arrange the light projecting unit 4 and the light receiving unit 5 that make a pair in the gap. This prevents a situation in which the line light 3 irradiated from the light projecting unit 4 to the glass tube 2 and the reflected light reflected by the glass tube 2 received by the light receiving unit 5 are blocked by the roller 7. it can. In the illustrated example, the roller 7 that transports the glass tube 2 is formed with a position regulating groove 7a such as a V-groove so as to regulate the movement of the glass tube 2 in the direction orthogonal to the axis X. . A plurality of light projecting sections 4 are arranged in a spiral shape with the axis X of the glass tube 2 as the center, and the optical axis centers of the respective light receiving sections 5 with respect to the optical axis centers L1 of the individual light projecting sections 4. It arrange | positions so that L2 may make a predetermined angle (100 degrees-150 degrees).

  FIG. 6 is a plan view showing a defect inspection apparatus according to the second embodiment of the present invention. The difference between the defect inspection apparatus 1 according to the second embodiment and the defect inspection apparatus 1 according to the first embodiment described above is configured to inspect for the presence or absence of a foreign substance that becomes a defect in the glass tube 2. In the point.

  More specifically, in the defect inspection apparatus 1 according to the second embodiment, a part of the light receiving surface 5a of the light receiving unit 5 shown in FIG. 7A is formed by the masks 8 and 8 as shown in FIG. The light receiving range in the thickness direction (direction of the axis X) of the line light irradiated from the light projecting unit 4 is limited to a range corresponding to the thickness of the line light 3. That is, when the reflected light spreading in the same plane as the line light 3 irradiated from the light projecting unit 4 is diffused in the direction of the axis X, the diffused portion is incident on the light receiving surface 5a of the light receiving unit 5. It is supposed not to. In addition, as the light-receiving part 5 used by this embodiment, what can detect the sum total of the light-receiving amount of the reflected light received by the whole light-receiving surface 5a should just be detected.

  And when the reflected light which arises also when there is no defect in the glass tube 2 is again irradiated to a foreign material, the reflected light corresponding to the part irradiated to the foreign material is weakened by scattering. At this time, the light scattered by the foreign matter diffuses in all directions.

  Therefore, when there is no foreign object in the glass tube 2, as shown in FIG. 8, the reflected light (light which projects the image shown by R in a figure) which spreads in the same plane as the line light 3 irradiated from the light projection part 4 is shown. ) Passes through the gap between the masks 8 and 8 and enters the light receiving surface 5 a of the light receiving unit 5. On the other hand, when there is a foreign substance in the glass tube 2, as shown in FIG. 9, reflected light that spreads in the same plane as the line light 3 irradiated from the light projecting unit 4 (light that displays an image indicated by R in the figure). ) Diffuses and spreads in the direction of the axis X, and the reflected light of the diffused portion is blocked by the masks 8 and 8. Therefore, by limiting the light receiving range of the light receiving unit 5 as described above, the amount of received light is greatly reduced when there is a foreign object. Therefore, it becomes easy to detect the amount of decrease in the amount of light received by the foreign object, and as a result, the presence or absence of the foreign object can be accurately detected.

  In this embodiment, the angle θ between the optical axis center L1 of the line light 3 irradiated from the light projecting unit 4 and the optical axis center L2 of the reflected light received by the light receiving unit 5 is 100 ° to 170. Set within the range of °.

  Moreover, about the point other than these, the structure similar to said 1st Embodiment is employable. That is, as shown in FIG. 5, a plurality of light projecting portions 4 may be arranged so that the line-shaped light 3 is irradiated to the glass tube 2 from different directions. You may make it irradiate a linear light from the light projection part 4, conveying in the X direction.

  The present invention is not limited to the above embodiment, and can be implemented in various forms without departing from the gist of the present invention. For example, in the above-described embodiment, the circular glass tube 2 is exemplified as the glass article. However, the glass article is a columnar glass column, or a long glass serving as a base of the glass tube or the glass column. Even in the case of the original material, the presence or absence of defects can be inspected in the same manner.

1 is a perspective view showing a defect detection device according to a first embodiment of the present invention. It is the top view which looked at the defect detection apparatus shown in FIG. 1 from the axial center direction of the glass tube. It is a graph which shows an example of intensity distribution of the reflected light received with the light-receiving part shown in FIG. 1 in the state in which there is no bubble in a glass tube. It is a graph which shows an example of intensity distribution of the reflected light received with the light-receiving part shown in FIG. 1 in the state with a bubble in a glass tube. It is a top view which shows the modification of the defect detection apparatus which concerns on 1st Embodiment. It is a top view which shows the defect detection apparatus which concerns on 2nd Embodiment of this invention. (A) is a front view which shows the light-receiving surface of the light-receiving part of FIG. 6, (b) is a front view which shows the state which masked the light-receiving surface of the light-receiving part. It is a front view which shows the state of the reflected light which injects into the light-receiving part shown in FIG.7 (b) in the state in which there is no foreign material in a glass tube. It is a front view which shows the state of the reflected light which injects into the light-receiving part shown in FIG.7 (b) in the state with a foreign material in a glass tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Defect inspection apparatus 2 Glass tube 3 Line light 4 Light-projecting part 5 Light-receiving part 5a Light-receiving surface 6 Judgment part 7 Roller 7a Position control groove 8 Mask L1 Optical axis center L2 of irradiated line light Optical axis center of reflected light

Claims (8)

  A line-shaped light is irradiated from the light projecting unit so as to cross the cylindrical or columnar glass article, and the reflected light reflected by the glass article among the irradiated light is received by the light receiving unit. A method for inspecting a defect of a glass article, wherein the presence or absence of a defect in the glass article is inspected based on a change.   The glass article defect inspection method according to claim 1, wherein the light projection unit irradiates a line-shaped light along a plane orthogonal to the axis of the glass article.   The light receiving unit is disposed at a position excluding an optical path of transmitted light that travels straight through the glass article out of line-shaped light irradiated to the glass article from the light projecting unit. 3. A method for inspecting defects of a glass article according to 2.   The defect inspection method for a glass article according to any one of claims 1 to 3, wherein linear light is irradiated from the light projecting unit while moving the glass article in an axial direction.   The defect inspection method for a glass article according to any one of claims 1 to 4, wherein a plurality of the light projecting portions are arranged to irradiate the glass article with linear light from different directions.   The defect to be detected of the glass article is a bubble, the intensity distribution of the received light quantity of the reflected light is detected by the light receiving unit, and the bubble contained in the glass article based on the detected change in the intensity distribution of the received light quantity The glass article defect inspection method according to claim 1, wherein the presence or absence of the glass article is inspected.   The defect to be detected of the glass article is a foreign substance, and among the light receiving parts, a light receivable range in a direction corresponding to the axial direction of the glass article of line light irradiated from the light projecting part, The line-shaped light irradiated from the light projecting unit is limited according to the thickness in the axial direction of the glass article, and is included in the glass article based on the amount of light received by the light-receiving unit that is received. The method for inspecting a defect of a glass article according to any one of claims 1 to 5, wherein the presence or absence of a foreign object is inspected.   A light projecting unit that irradiates line-shaped light so as to cross a cylindrical or columnar glass article, and a light receiving unit that receives reflected light reflected by the glass article out of the light emitted from the light projecting unit; A glass article defect inspection apparatus comprising: a determination unit that determines the presence or absence of a defect in the glass article based on a change in the amount of received light of the reflected light received by the light receiving unit.

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