JPH06331557A - Method and apparatus for measurement of abnormal point linear body as well as method and apparatus for manufacture of linear body - Google Patents

Abstract

PURPOSE:To provide a measuring method which can detect a hole in a glass fiber in a noncontact manner and simply. CONSTITUTION:A laser light source 2 is arranged in such a way that a face at right angles to the axial line of a glass fiber 1 is irradiated with a laser beam. A CCD camera 3 is installed inside the same plane as the face so as to be at right angles to the optical axis of the laser light source 2, and it picks up reflected light from the glass fiber 1. When a hole exists in the glass fiber 1, reflected light is generated. When the brightness distribution of the reflected light is analyzed, it is possible to estimate whether an abnormal point exists or not inside the glass fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring abnormal points having different refractive indexes existing in a linear body, and a method and an apparatus for manufacturing a linear body.

[0002]

2. Description of the Related Art The presence of holes in a linear body, for example, glass fiber causes a problem such as a decrease in strength of the glass fiber.

The conventional method for detecting an abnormal point in a linear body, for example, a hole, is based on the empirical rule that the outer diameter of a linear body, for example, a portion having a hole in glass fiber is different from that of a portion having no hole. During the production of glass fiber, the change in the outer diameter of the glass fiber is monitored, and the place where the outer diameter is changed is excluded. In addition, when actually checking whether there is a hole, a method of visually observing from the side of the glass fiber with a microscope or cutting the glass fiber and observing the end face with a microscope in the same way is adopted. Has been done.

However, the cause of the variation of the outer diameter may be other than the presence or absence of the hole, and it is not always sufficient to measure the change of the outer diameter to determine the presence or absence of the hole. In addition, it takes time for a person to visually determine the presence or absence of holes, and it is inefficient to employ the above-described method during glass fiber production. Therefore, in the field of glass fiber production, in order to produce high-performance glass fibers with high productivity, the advent of a technique for accurately and efficiently measuring abnormal points in glass fibers in-line is desired.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and is non-contact and simple.
A linear body, for example, a measuring method and device capable of detecting a hole in a glass fiber without depending on its position, and
It is an object of the present invention to provide a method and an apparatus for manufacturing a linear body using the same.

[0006]

According to a first aspect of the present invention, in the method for measuring an abnormal point in a linear body, the side surface of the linear body is orthogonal to the longitudinal direction of the linear body. Laser light is irradiated onto the surface to be reflected, the reflected light from the linear body is received by the one-dimensional or two-dimensional sensor arranged in the same plane as the laser light, and the brightness distribution of the received reflected light is analyzed. Thus, the presence or absence of an abnormal point in the linear body is estimated.

The invention according to claim 2 is characterized in that, in the method for measuring an abnormal point in the linear body according to claim 1, a plurality of one-dimensional or two-dimensional sensors are arranged. In the invention described in [1], the method for measuring an abnormal point in a linear body according to claim 1 or 2 is characterized in that a plurality of laser beams are emitted from different directions.

According to a fourth aspect of the present invention, in the method for measuring an abnormal point in a linear body according to any one of the first to third aspects, in a meniscus portion directly below a die for coating a resin on the linear body. The reflected light from the linear body is received, and the invention according to claim 5 is the method for measuring an abnormal point in a linear body according to any one of claims 1 to 3. The reflected light from the linear body before and after the resin application is received respectively. In the invention according to claim 6,
The method for measuring an abnormal point in a linear body according to any one of claims 1 to 3, wherein reflected light from the linear body after resin coating is received.

According to a seventh aspect of the present invention, in the method for measuring an abnormal point in a linear body according to any one of the first to sixth aspects, the laser beam is irradiated in a pulsed form. is there.

According to the eighth aspect of the invention, in the apparatus for measuring abnormal points in a linear body, a light source for irradiating a side surface of the linear body with laser light in a plane orthogonal to the longitudinal direction of the linear body. And a one-dimensional or two-dimensional sensor arranged so as to receive the reflected light from the linear body in the same plane as the laser light.

According to a ninth aspect of the present invention, in the linear in-vivo abnormal point measuring device according to the eighth aspect, a plurality of one-dimensional or two-dimensional sensors are arranged. In the invention described in claim 8,
Alternatively, the linear in-vivo abnormal point measuring device described in 9 has a light source unit for irradiating a plurality of laser beams from different directions.

According to an eleventh aspect of the present invention, in the apparatus for measuring an abnormal point in a linear body according to any one of the eighth to tenth aspects, a meniscus portion directly below a die for coating a linear body with resin is used. The light source means and the one-dimensional or two-dimensional sensor are arranged so as to receive the reflected light from the linear body, and the invention according to claim 12 provides the invention according to any one of claims 8 to 10. In the apparatus for measuring an abnormal point in a linear body according to the item 1, light source means and a one-dimensional or two-dimensional sensor are arranged so as to receive reflected light from the linear body before and after the resin application, respectively. In the invention according to claim 13, in the linear in-vivo abnormal point measuring device according to any one of claims 8 to 10, reflected light from the linear body after resin coating is applied. It is characterized in placing the light source means and one-dimensional or two-dimensional sensor to light.

According to a fourteenth aspect of the present invention, in the linear in-vivo abnormal point measuring apparatus according to any one of the eighth to thirteenth aspects, a light source means for irradiating a laser beam in a pulse shape is used. It is what

Further, the linear body manufacturing method for manufacturing a linear body while measuring the presence or absence of an abnormal point in the linear body in a non-contact manner by using the above-mentioned linear body abnormal point measuring method, and the linear body A linear body manufacturing apparatus having an abnormal point measuring device and manufacturing a linear body while measuring the presence or absence of an abnormal point in the linear body in a non-contact manner is also a feature.

[0015]

According to the invention described in claims 1 to 14, a one-dimensional or two-dimensional sensor is used as a detector, and the linear body, for example, the side surface of the glass fiber is orthogonal to the longitudinal direction of the glass fiber. The laser light is radiated into the plane to be incident on the glass fiber, the reflected light from the glass fiber is received by the one-dimensional or two-dimensional sensor arranged in the same plane, and the brightness distribution of the received reflected light is analyzed. Thus, it is possible to estimate the presence / absence of an abnormal point in the linear body.

When a two-dimensional sensor is used, the state of reflected light can be detected as a plane image, which is advantageous in terms of recognizing abnormal points. Further, when the one-dimensional sensor is used, the speed is higher than that of the two-dimensional sensor, so that the abnormal point in the linear body can be detected at a higher speed.

In this case, the amount of reflected light from the abnormal point reaching the light receiver may differ depending on the position of the abnormal point in the glass fiber with respect to the light receiving section. By using a plurality of one-dimensional sensors or a plurality of two-dimensional sensors, the reflected light is
It can be detected more efficiently.

When using a single laser beam,
If there is a portion where the light quantity density that passes through the glass fiber body is small and there is an abnormal point in that portion, the amount of light reflected from the abnormal point also becomes small. By irradiating from different directions using a plurality of laser beams, it is possible to reduce the portion where the light amount density becomes small and prevent the reduction of the reflected light from the abnormal point to receive the light.

By using a plurality of laser beams and a plurality of one-dimensional sensors or a plurality of two-dimensional sensors,
It is possible to more efficiently receive the reflected light from the abnormal point by eliminating the portion where the light amount density is small and not depending on the position of the abnormal point in the glass fiber with respect to the light receiving portion.

By receiving the reflected light from the linear body at the meniscus portion directly below the die for coating the linear body with resin, surface reflection and reflection due to an abnormal point can be detected separately.

Further, the reflected light from the linear body before and after the resin application is respectively received and the comparison processing of the two is performed, thereby erroneously detecting scattered light due to scratches on the surface of the linear body. And more reliable detection can be performed. The comparison process may take an AND (logical sum) of both.

By receiving the reflected light from the linear body after applying the resin, it is possible to detect an abnormal point in the peripheral portion of the linear body.

By irradiating the laser beam in pulses, the exposure time can be shortened, the reflected light from the linear body can be received without blurring or blurring, and the abnormal point can be detected efficiently. .

Further, since the light source and the one-dimensional sensor or the two-dimensional sensor are used, the abnormal point can be detected in a non-contact manner and easily without depending on the position of the abnormal point in the glass fiber, and incorporated in the manufacturing process. It is easy to do.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of a first embodiment of the linear in-vivo abnormal point measuring device of the present invention. In the figure, 1 is glass fiber,
Reference numeral 2 is a laser light source, and 3 is a CCD camera. The laser light source 2 is arranged so as to irradiate the laser light in a plane orthogonal to the axis of the glass fiber 1. The CCD camera 3 is installed on the same plane as the above-mentioned surface and receives the reflected light from the glass fiber 1. The optical axis of the laser beam and C
It is preferable that the angle formed by the optical axis of the CD camera 3 is substantially right angle. The CCD camera 3 is used as a two-dimensional sensor and is not necessarily limited to the CCD camera. It is also possible to use a two-dimensional sensor in which photoelectric elements are arranged two-dimensionally and surface scanning is performed using a scanning circuit.

2 and 3 are explanatory views of the reflected light with respect to the irradiation light on the glass fiber. In the figure, 1 is a glass fiber, 3 is a CCD camera, 4 is irradiation light, and 5 is a hole. The irradiation light 4 is the light from the laser light source described in FIG.
The angle between the optical axis of the laser beam and the optical axis of the CCD camera in FIG. 1 was a right angle.

FIG. 2 (A) is an explanatory view showing a state in which the irradiation light 4 is incident on the glass fiber 1 in the portion having no hole. The glass fiber 1 is shown in a cross section perpendicular to the axial direction. Irradiation light 4
Can be considered to be incident parallel to the glass fiber 1. The irradiation light 4 incident on the glass fiber 1 is the glass fiber 1
The light is refracted on the surface of and is transmitted through the glass fiber 1, but a part is reflected as scattered light P on the surface. Further, a part of the irradiation light 4 is reflected as specular reflection light Q on the surface of the glass fiber 1. Further, the light transmitted through the inside of the glass fiber 1 is emitted from the surface on the side opposite to the incident side of the irradiation light, but a part thereof is reflected as scattered light R. The CCD camera 3 images these reflected lights from the right side of the drawing, for example. The output of the scanning line having the image data captured by the CCD camera 3 is shown in FIG.
It shows in (B). Assuming that the scanning direction is scanning from the top to the bottom of FIG. 2A, the scattered light P and R at both end positions of the glass fiber 1 and the glass fiber close to the light source, as shown in FIG. 2B. The regular reflection light Q from the surface is output. Figure 2
In (B), the horizontal axis is the time axis, but the glass fiber 1
Since it corresponds to the position of the side surface of the above when viewed from the right side, the portion between the scattered lights P and R corresponds to the outer diameter of the glass fiber 1.

FIG. 3 is an explanatory view of a state in which the irradiation light 4 is incident on the portion of the glass fiber 1 having a hole. As shown in FIG. 3 (A), a part of the light incident on the glass fiber 1 is reflected by the hole 5 to generate reflected light S. Therefore, since the reflected light S from the hole 5 appears in the brightness distribution of the reflected light shown in FIG. 3B, the abnormal point can be detected by detecting this.

As described above, by analyzing the spatial change in the brightness distribution of the reflected light, the presence or absence of the abnormal point of the glass fiber can be estimated. That is, the reflected light from the surface of the glass fiber is measured by the CCD camera regardless of the presence or absence of the abnormal point, but the glass fiber having the abnormal point has a component of the reflected light due to the abnormal point, so that the glass without the abnormal point is present. The brightness distribution received by the CCD camera is different from that of the fiber. Therefore, the abnormal point can be detected from the spatial change of the brightness distribution.

Regarding the spatial variation of the brightness distribution, the brightness distribution of a portion having no abnormal points is stored in memory, and this data is compared with the detected brightness distribution data, and the difference is used to determine the presence or absence of an abnormal point in the glass fiber. You may make it detect.

The reflected light S from the abnormal point is detected by separating the scattered light P, R from the surface of the glass fiber and the specularly reflected light Q using a gate synchronized with the scanning of the CCD camera. You can also The starting pulse may be generated by the first scattered light P, and this may be used as a synchronization signal to open the gate for a predetermined time excluding Q and R. If there is a reflected pulse S in the meantime, it can be detected because it passes through the gate.

The image data is captured by the CCD camera by opening the shutter of the minute time camera and scanning the surface to capture the image data. In the above-described embodiment, the detection method using the image data of one line has been described, but the data of a plurality of lines may be added. Alternatively, it may be detected as two-dimensional image data. Two-dimensional data may be analyzed when an abnormal point is detected by one-dimensional data.

The amount of the reflected light S reflected by the abnormal point is influenced by the position of the abnormal point in the glass fiber. This is because the amount of light reaching the CCD camera out of the amount of light reflected from the abnormal point depends on the distance from the reflection point. Therefore, C
When a single CD camera is used, there is a possibility that an abnormal point at a position where the amount of light reflected from the abnormal point is small cannot be detected.
Further, as described above, since the amount of specularly reflected light Q reflected is large, if there is a hole at a position that coincides with the specularly reflected portion, the reflected component due to the hole will be hidden, and it may not be possible to reliably detect the hole. .

FIG. 4 is for explaining the relationship between the position of the hole and the brightness. FIG. 4 (A) is an explanatory view showing the position of the hole in the glass fiber, and FIG. 4 (B) is the hole. It is a diagram showing the luminance for the position of. In the figure, 1 is glass fiber, 3 is CCD
Camera 4 is irradiation light, and 5a, 5b, 5c and 5d are holes. The angle of the position of the hole 5a is 0 °, the angle is set clockwise, and the output of the CCD camera 3 is plotted in FIG.
(B). The brightness is highest when the hole 5c is located, and the brightness is lowest when the hole 5a is located. Also, the brightness increases as the diameter of the hole increases.

FIG. 5 is an explanatory view of a second embodiment of the linear in-vivo abnormal point measuring device of the present invention. This embodiment can correct the above-mentioned difference in detection sensitivity with respect to the position of the hole, and uses two CCD cameras. In the figure, the same parts as those in FIG.
3a and 3b are CCD cameras. The laser light source 2 and the CCD camera 3a may be the same as in the first embodiment. CC
The D camera 3b is provided at a position opposite to the CCD camera 3a. Therefore, the CCD cameras 3a and 3b are
In the plane that includes the optical axis of the laser light source 2 and is orthogonal to the glass fiber 1, the reflected light from the glass fiber 1 is imaged from two directions, and depends on the position of the hole existing in the cross section of the glass fiber 1. There is no such thing. Also, one CCD
Even if the reflection component from the hole is hidden by the regular reflection component in the camera, the other CCD camera can reliably detect the reflection light from the hole. The number of CCD cameras is not limited to two, and the arrangement angle is not limited to 90 ° with respect to the optical axis of the laser light source 2, as described above.

FIG. 6 is an explanatory view of the state of light incident on the glass fiber. Irradiation light 4 from only one direction of glass fiber 1
When the glass fiber 1 is made incident, a region 6 having a small light quantity density exists in the glass fiber 1. When a hole is present in this area 6, the amount of light reflected by the hole is small, and therefore the hole may not be detected.

FIG. 7 is an explanatory view of the third embodiment of the linear in-vivo abnormal point measuring device of the present invention. This embodiment can correct the difference in detection sensitivity with respect to the nonuniformity of the light quantity density described above, and uses two laser light sources.
In the figure, the same parts as those in FIG. 2a and 2b are laser light sources. Also in this embodiment, the laser light source 2a and the CCD camera 3 may be the same as in the first embodiment. The laser light source 2b is the laser light source 2a.
It is provided in the opposite position. Therefore, the glass fiber 1 is irradiated from both sides, and the glass fiber 1
The amount of light inside can be made uniform, and the presence or absence of holes can be reliably measured. The number of laser light sources is not limited to two, and the arrangement angle is not limited to 180 ° described above.

Alternatively, the light reflected from the hole may be measured by making light incident from a plurality of CCD cameras and a plurality of directions. Incident light from a plurality of directions can be obtained by a plurality of light sources, but it is also possible to obtain light in a plurality of directions from one light source by dividing it using a half mirror or an optical fiber. Furthermore, when using irradiation light from a plurality of directions, this may be configured in multiple stages.

FIGS. 8 and 9 are explanatory views of a fourth embodiment of the linear in-vivo abnormal point measuring device of the present invention. This example
The light source and the CCD camera are arranged in a two-stage configuration. FIG. 8 is an external view of the measuring section, which is composed of a lower step portion 9 and an upper step portion 10 and in which a glass fiber insertion groove 8 is formed.
FIG. 9 shows the internal structure of the lower part 9 and the upper part 10. In the figure, 1 is glass fiber, 2a and 2b are laser light sources, 3a,
CCD cameras 3b, 3c and 3d, a light absorbing member 7 and 8
Is an insertion groove, 9 is a lower step, 10 is an upper step, 11 is a lens barrel, 1
2 is a lens, 13 is an interference filter, 14 is a two-dimensional CC
It is D. Each CCD camera 3a, 3b, 3c, 3d
A lens L is attached to the lens barrel A, and a photoelectric conversion output is taken out by a CCD via an interference filter F. The light absorbing member 7 is arranged so as to absorb the light transmitted from the laser light sources 2a and 2b through the region of the glass fiber 1. Further, the lower groove portion 9 and the upper groove portion 10 are provided with the insertion grooves 8 at the corresponding positions so that the glass fibers 1 can be set at the measurement position without being cut.

The lower part 9 is provided with one laser light source 2a and two CCD cameras 3a and 3b, and the reflected light of the glass fiber 1 by the irradiation light from the laser light source 2a is CC
The images are taken by the D cameras 3a and 3b. Similarly, the upper part 10 has one laser light source 2b and two CCD cameras 3
c, 3d are provided, and the reflected light of the glass fiber 1 by the irradiation light from the laser light source 2b is reflected by the CCD cameras 3c, 3d.
detected by d. Therefore, as described in the second embodiment, holes can be efficiently detected in each step.

Further, the optical axis of the laser light source 2a in the lower stage portion 9 and the optical axis of the laser light source 2b in the upper stage portion 10 are arranged so as to form an angle of 90 °. Therefore, as described in the third embodiment, since a plurality of light sources are used, it is possible to avoid the influence of nonuniformity of the light quantity density in the glass fiber. The angle between the optical axis of the laser light source 2a in the lower step portion 9 and the optical axis of the laser light source 2b in the upper step portion 10 does not necessarily have to be 90 °. The angle may be 180 °, or it may be arranged to have another suitable angle.

In this case, the measurement is performed while the glass fiber 1 is running at a uniform speed, and the abnormal point detected by the output of the CCD camera is evaluated in consideration of the time difference between the lower part 9 and the upper part 10. Thus, only one detection output can be obtained for one hole.

FIG. 10 is an explanatory view of a fifth embodiment of the linear in-vivo abnormal point measuring device of the present invention. In the figure, 1 is a glass fiber, 2 is a laser light source, 3 is a CCD camera, 15 is a coating resin, and 16 is a die. In this embodiment, the glass fiber 1 is imaged by applying irradiation light from the laser light source 2 immediately below the die 16 for coating the coating resin 15 on the glass fiber 1. Immediately below the die 16, the coating resin 15 forms a meniscus portion.
If the optical axis of is in a plane orthogonal to the axis of the glass fiber 1 and the optical axis of the CCD camera 3 is in the same plane as the above-mentioned plane, then as shown in FIG. In addition, the direction of the regular reflection light Q on the surface of the glass fiber 1 is downward from the above-mentioned surface, and the component incident on the CCD camera 3 is small. Therefore, it is possible to suppress the specular reflection light on the surface of the glass fiber 1 from entering the CCD camera 3, which facilitates detection of an abnormal point.

In the first to fourth examples, the abnormal points in the uncoated glass fiber were detected. of course,
These examples can be applied to coated glass fibers. However, the first to the fourth
When the abnormal point in the glass fiber is detected by the method of the embodiment, there is a possibility that a flaw on the surface of the glass fiber is erroneously detected. Therefore, when observing in the state of glass fiber, observing the glass fiber again after applying the resin to the glass fiber, and recognizing the same abnormal point at both observation points, it is determined that there is an abnormal point in the glass fiber. In this case, the above-mentioned malfunction can be eliminated. This is because the difference in the refractive index between the resin and the glass is smaller than the difference in the refractive index between the air and the glass, so it is better to observe after applying the resin because the reflected light due to scratches on the glass surface is smaller. .

When the glass fiber not coated with the resin is observed, as described with reference to FIG. 2, as shown in FIG. 12, scattered light from the surface of the glass fiber on the side opposite to the light source side is shown. The specularly reflected light Q appears between P and R. When the optical axis of the laser light source and the optical axis of the CCD camera are substantially perpendicular to each other, the specularly reflected light Q appears near the scattered light P from the surface of the glass fiber. Therefore, when the abnormal point is located at the position of the specularly reflected light Q, the light reflected by the abnormal point becomes the specularly reflected light Q.
Will not be detected because it is hidden in the area, leading to failure to detect abnormal points.

When observed with the resin coating on the glass fiber, it becomes the same as when the diameter of the glass fiber becomes large, and the specular reflection light Q appears at the resin coating portion as shown in FIG. In FIG. 13, T and U are scattered light from the surface of the resin coating on the light source side and the surface on the opposite side, and P and R are
It is the scattered light from the surface of the glass fiber on the light source side and on the opposite side. P and R have a small difference in refractive index and a small amount of reflected light because the surface of the glass fiber is coated with resin. In this way, by applying resin to the glass fiber, the specular reflection light from the glass fiber does not appear in the area of the glass fiber, and the abnormal point is not hidden by the specular reflection light. It becomes possible to do.

When detecting abnormal points in the manufacturing process in which the glass fiber is coated with a resin, the abnormal points can be detected before and after the coating step. By evaluating the detection signal in consideration of the time difference between the detection positions, the abnormal point can be detected more reliably.

In the above description, the two-dimensional sensor is used as the image pickup means. Specifically, a CCD camera was used, but the CCD camera has a slow image capturing speed. NTS
If the scanning is similar to that of the C method, since the frame frequency is 30 Hz, it takes 1/30 seconds to capture one frame of data.

By using the line sensor, data can be taken in at a higher speed. By increasing the image capturing speed, it is possible to reliably detect abnormal points in the glass fiber in-line. When the line sensor is used, the CCD camera in the above-mentioned embodiment may be replaced with the line sensor. Therefore, their description will be omitted.

Even when an image is picked up by using a line sensor or an electronic shutter of a CCD camera, the linear object is subject to line blurring, which causes blurring or blurring in the captured image data. For example, if the line blur does not occur, the brightness distribution as shown in FIG. 14 should be observable, but if the line blur occurs, the brightness distribution as shown in FIG. 15 is detected.
Sometimes abnormal points cannot be detected accurately.

Therefore, it is possible to shorten the actual exposure time by using a pulsed light source as the laser light source to intermittently emit light. As a result, image data without blurring or blurring as shown in FIG. 14 can be taken in, and an abnormal point can be accurately detected. The light emission of the light source may be synchronized with the scanning of the line sensor or the CCD camera.

Although the above-mentioned embodiments are concerned with the detection of holes in glass fibers, it goes without saying that glass fibers include optical fibers. Further, it can also be applied to the detection of abnormal points in other linear bodies having a light transmitting property.

Further, since the holes of the linear body can be continuously detected, the linear body can be incorporated in the manufacturing apparatus and a high quality linear body without any abnormal point can be manufactured.

[0054]

As is apparent from the above description, according to the present invention, since the linear body is observed from its side surface, it is possible to detect the holes in a non-contact and simple manner, and to apply it to the manufacturing process. It is also possible to measure the presence or absence of holes during manufacturing.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a first embodiment of a linear abnormal point measuring device of the present invention.

FIG. 2 is an explanatory diagram of a method of measuring the presence / absence of holes in the first embodiment.

FIG. 3 is an explanatory diagram of a method for measuring the presence / absence of holes in the first embodiment.

FIG. 4 is an explanatory diagram and a diagram showing the relationship between the position of a hole and the amount of received light with respect to the amount of received light.

FIG. 5 is an explanatory diagram of a second embodiment of the linear in-vivo abnormal point measuring device of the present invention.

FIG. 6 is an explanatory diagram of a situation of light incident on a glass fiber.

FIG. 7 is an explanatory diagram of a third embodiment of the linear in-vivo abnormal point measuring device of the present invention.

FIG. 8 is an external view of a measuring unit of a fourth embodiment of the linear in-vivo abnormal point measuring device of the present invention.

FIG. 9 is a configuration diagram of a measuring unit according to a fourth embodiment.

FIG. 10 is an explanatory view of a fifth embodiment of the linear in-vivo abnormal point measuring device of the present invention.

FIG. 11 is a diagram showing image data in the fifth embodiment.

FIG. 12 is a diagram showing imaged image data of uncoated glass fiber.

FIG. 13 is a diagram showing image data obtained by imaging a glass fiber coated with a resin.

FIG. 14 is a diagram showing image data captured in a state without line blur.

FIG. 15 is a diagram showing image data taken with line blurring.

[Explanation of symbols]

 1 glass fiber 2, 2a, 2b laser light source 3, 3a, 3b, 3c, 3d CCD camera 4 irradiation light 5 holes

Claims (16)

[Claims] 1. A one-dimensional or two-dimensional sensor arranged on the same plane as the laser beam by irradiating the side surface of the linear body with laser light in a plane orthogonal to the longitudinal direction of the linear body. The method for measuring an abnormal point in a linear body is characterized in that the presence / absence of an abnormal point in the linear body is estimated by receiving reflected light from the linear body and analyzing the luminance distribution of the received reflected light. . 2. The method for measuring an abnormal point in a linear body according to claim 1, wherein a plurality of one-dimensional or two-dimensional sensors are arranged. 3. The linear in-body abnormal point measuring method according to claim 1, wherein a plurality of laser beams are emitted from different directions. 4. The linear member according to claim 1, wherein reflected light from the linear member is received at a meniscus portion directly below a die for coating the linear member with a resin. How to measure abnormal points in the body. 5. The method for measuring an abnormal point in a linear body according to claim 1, wherein the reflected light from the linear body before and after the resin coating is received, respectively. 6. The method for measuring an abnormal point in a linear body according to claim 1, wherein the reflected light from the linear body after applying the resin is received. 7. The linear in-vivo abnormal point measuring method according to claim 1, wherein the laser beam is applied in a pulsed manner. 8. A light source means for irradiating the side surface of the linear body with laser light in a plane orthogonal to the longitudinal direction of the linear body,
An apparatus for measuring abnormal points in a linear body, comprising a one-dimensional or two-dimensional sensor arranged so as to receive reflected light from the linear body in the same plane as the laser light. 9. The linear in-vivo abnormal point measuring device according to claim 8, wherein a plurality of one-dimensional or two-dimensional sensors are arranged. 10. The linear in-vivo abnormal point measuring device according to claim 8 or 9, further comprising light source means for irradiating a plurality of laser beams from different directions. 11. A light source means and a one-dimensional or two-dimensional sensor are arranged so as to receive reflected light from the linear body at a meniscus portion directly below a die for coating the linear body with a resin. The linear abnormal point measuring device according to any one of 8 to 10. 12. A light source means and 1 for receiving the reflected light from the linear body before and after the resin application, respectively.
The linear in-vivo abnormal point measuring device according to claim 8, wherein a two-dimensional or two-dimensional sensor is arranged. 13. The light source means and the one-dimensional or two-dimensional sensor are arranged so as to receive the reflected light from the linear body after the resin coating, according to any one of claims 8 to 10. Measuring device for abnormal points in linear body. 14. The linear in-vivo abnormal point measuring device according to claim 8, wherein a light source means for irradiating the laser beam in a pulsed form is used. 15. A linear body is manufactured by using the method for measuring an abnormal point in a linear body according to any one of claims 1 to 7 while measuring the presence or absence of an abnormal point in the linear body in a non-contact manner. A method for producing a linear body, comprising: 16. The linear body is manufactured while having the linear body abnormal point measuring device according to claim 8 and measuring the presence or absence of the abnormal point in the linear body in a non-contact manner. A linear body manufacturing apparatus characterized by the above.