JPH06329432A - Apparatus for producing optical fiber soot - Google Patents

Abstract

PURPOSE:To provide an apparatus for producing an optical fiber soot capable of measuring the variation in relative position between bearing brackets at both ends thereof during the synthesis of the optical fiber soot. CONSTITUTION:The weight of an optical fiber soot 8 is continuously or intermittently measured by a weight measuring means 12 while producing the optical fiber soot 8 on the outer periphery of a core preform 6 by moving a burner 7 for depositing fine glass particles on the outer periphery of the core preform 6 relatively to the core preform 6 rotating around the axial center. In the process, a means 24 for sensing the variation in relative position capable of sensing the variation in the relative position between both bearing brackets (4a) and (4b) supporting both ends of the core preform 6 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an optical fiber soot by relatively moving a burner for depositing glass fine particles on the outer periphery of a core preform which rotates around its axis. The present invention relates to an optical fiber soot device to be manufactured.

[0002]

2. Description of the Related Art The structure of an optical fiber has a core at the center and a clad surrounding the core.
Such an optical fiber is obtained by drawing an optical fiber preform. The optical fiber preform is manufactured, for example, by first creating a core preform (including one having a part of a clad portion on the outside), and depositing glass fine particles on the outer periphery of the core preform to form an optical fiber soot. Is manufactured, and the optical fiber soot is made into a transparent glass to prepare a clad preform.

FIG. 12 shows a schematic structure of a conventional optical fiber soot manufacturing apparatus. In the optical fiber soot manufacturing apparatus, a gantry 2 is installed on a floor 1 of a factory, and rails 3a and 3b are installed on the left and right of the gantry 2 in directions parallel to each other. Bearing brackets 4a and 4b are reciprocally driven on these rails 3a and 3b by reciprocating driving means (not shown) at the same time while maintaining the same distance in the same direction. Spindles 5a and 5b are rotatably supported on these bearing brackets 4a and 4b, and these spindles 5a and 5b are simultaneously driven to rotate in the same direction around their axes by a rotation driving means (not shown). . These spindles 5a and 5b have core base materials 6
Both ends of are supported.

A burner 7 is provided at a position facing the core base material 6.
The glass fine particles produced in the flame of the burner 7 are deposited on the outer periphery of the core preform 6 to form the optical fiber soot 8. A gas supply unit 9 is connected to the burner 7.

Weight sensors 10a, 10b such as load cells for measuring the weight of the core preform 6 and the optical fiber soot 8 are provided at the bearing brackets 4a, 4b. The weight signals from these weight sensors 10a and 10b are given to the weight signal processing unit 11 to measure the weights of the core preform 6 and the optical fiber soot 8. The weight sensors 10a and 10b and the weight signal processing unit 11 constitute weight measuring means 12. When the weight of the optical fiber soot 8 reaches a predetermined weight, the weight signal processing unit 11 causes the gas supply unit 9 to
A stop signal is output to stop the production of the optical fiber soot 8.

In such an optical fiber soot manufacturing apparatus, the core base material 6 is rotated about its axis by the rotation driving means (not shown) via the spindles 5a and 5b, while the core base material 6 is rotated by the spindles 5a and 5b. An optical fiber soot 8 is manufactured by reciprocally driving the core preform 6 by the reciprocating driving means via the 5b and the bearing brackets 4a and 4b to deposit glass fine particles on the outer periphery of the core preform 6. At this time, the weight of the core base material 6, the optical fiber soot 8, the spindles 5a and 5b, and the bearing brackets 4a and 4b is measured by the weight sensors 10a and 1b.
The weight signal obtained by detecting 0b is given to the weight signal processing unit 11 to measure the weight of the optical fiber soot 8 continuously or intermittently. At this time, the weight of the core base material 6, the spindles 5a and 5b, and the bearing brackets 4a and 4b is
Since it is a known value, the weight of the optical fiber soot 8 can be measured by removing it from the measured value. When the weight of the optical fiber soot 8 reaches a predetermined weight, the weight signal processing unit 11 outputs a stop signal to the gas supply unit 9 to stop the production of the optical fiber soot 8. At this time,
The maximum number of rotations of the core base material 6, the length of the core base material 6, and the reciprocating speed are 300 rpm, 1,000 mm, and 1,000 mm, respectively.
/ min.

By the way, as a factor for improving the quality of the optical fiber, the ratio of the core diameter to the clad diameter is constant in the longitudinal direction,
In addition, the concentricity of the core and the clad is high.
The quality of these is determined when the optical fiber soot is synthesized. That is, by controlling the clad weight with respect to the core weight, a good quality optical fiber can be manufactured.

[0008]

However, in such an optical fiber soot manufacturing apparatus, since the weight of the optical fiber soot being synthesized cannot be measured with high accuracy, the optical fiber soot having the target weight can be obtained. There is no problem. The weight of the optical fiber soot manufactured by the conventional optical fiber soot manufacturing apparatus varies within ± 100 g.

The reason for this is that in the conventional optical fiber soot manufacturing apparatus, the two bearing brackets 4a and 4b are relatively moved due to deformation of the gantry 2, deformation of the floor 1 on which the gantry 2 is installed, temperature change, and the like. When the positions change and the bearing brackets 4a and 4b reciprocate, the core base material 6 between the bearing brackets 4a and 4b is bent or twisted, and the weight sensors 10a and 10b are affected by the reaction force thereof. This is because the load fluctuates and the weight cannot be measured accurately.

That is, the fluctuation of the load applied to the weight sensors 10a and 10b is synchronized with the change amount of the relative positions of the two bearing brackets 4a and 4b, as shown in FIGS. In FIG. 13, the position of the bearing bracket 4a is A, B, C,
Bearing bracket 4a when changing like B, A,
4b shows the relative position change amount of 4b. Also, FIG.
4, the position of the bearing bracket 4a is A, B, C, B,
It shows the amount of change in weight of the optical fiber soot when it changes as shown by A.

It is an object of the present invention to provide an optical fiber soot manufacturing apparatus capable of measuring the amount of change in the relative position of the bearing brackets on both sides of the optical fiber soot during synthesis.

Another object of the present invention is to provide an optical fiber soot manufacturing apparatus which can measure the weight of the optical fiber soot being synthesized with high accuracy.

[0013]

The constitution of the present invention which achieves the above object will be described as follows.

According to the first aspect of the present invention, the burner for depositing the glass fine particles on the outer periphery of the core base material is moved relative to the core base material rotating about the axis, and the core base material is moved. While manufacturing optical fiber soot on the outer periphery of the material,
In an optical fiber soot manufacturing apparatus for measuring the weight of the optical fiber soot continuously or intermittently by a weight measuring means, a relative position for detecting a change amount of a relative position between both bearing brackets supporting both ends of the core preform. A change amount detection means is provided.

According to a second aspect of the present invention, the burner for depositing glass fine particles on the outer periphery of the core base material is moved relative to the core base material rotating around the axis, and the core base material is moved. While manufacturing optical fiber soot on the outer periphery of the material,
In an optical fiber soot manufacturing apparatus for measuring the weight of the optical fiber soot continuously or intermittently by a weight measuring means, a relative position for detecting a change amount of a relative position between both bearing brackets supporting both ends of the core preform. Change amount detecting means and relative position relationship correction for correcting the relative position relationship between the bearing brackets so that the relative position change amount decreases by inputting the relative position change amount detected by the relative position change amount detecting means. And means are provided.

According to a third aspect of the present invention, the burner for depositing the glass fine particles on the outer periphery of the core base material is moved relative to the core base material rotating around the axis, so that the core base material is moved. While manufacturing optical fiber soot on the outer periphery of the material,
In an optical fiber soot manufacturing apparatus for measuring the weight of the optical fiber soot continuously or intermittently by a weight measuring means, a relative position for detecting a change amount of a relative position between both bearing brackets supporting both ends of the core preform. It is provided with a change amount detecting means, and the weight measuring means is configured to correct the measured weight by inputting the relative position change amount detected by the relative position change amount detecting means.

[0017]

When the relative position change amount detecting means for detecting the change amount of the relative position between the two bearing brackets supporting both ends of the core base material is provided as in claim 1, the change of the relative position between these bearing brackets is provided. The amount can be detected automatically. Therefore, by measuring the amount of change in the relative position between the bearing brackets, it is possible to know how much error is included in the measured weight of the optical fiber soot.

According to a second aspect of the present invention, the relative position change amount detecting means for detecting the change amount of the relative position between the two bearing brackets supporting both ends of the core base material, and the relative position change amount detecting means detect the relative position change amount detecting means. Providing relative position relationship correction means for inputting the relative position change amount and correcting the relative position relationship between both bearing brackets so that the relative position change amount decreases,
When the relative position change amount is detected by the relative position change amount detecting means, the relative positional relationship correcting means can automatically correct the deviation of the relative positional relationship between the two bearing brackets, thus improving the weight measurement accuracy of the optical fiber soot. Can be improved.

According to a third aspect of the present invention, there is provided a relative position change amount detecting means for detecting an amount of change in the relative position between both bearing brackets supporting both ends of the core preform, and a weight measurement for measuring the weight of the optical fiber soot. When the relative position change amount is detected by the relative position change amount detecting means, the means has a structure for correcting the measured weight by inputting the relative position change amount detected by the relative position change amount detecting means. By the weight measuring means, the error contained in the measured weight can be automatically removed,
Therefore, the weight measurement accuracy of the optical fiber soot can be improved.

[0020]

Embodiments of the present invention will be described in detail below with reference to the drawings. The parts corresponding to those in FIG. 12 described above are denoted by the same reference numerals.

FIG. 1 shows a first embodiment of an optical fiber soot manufacturing apparatus according to the present invention.

In the optical fiber soot manufacturing apparatus of this embodiment, the table 1 is mounted on one bearing bracket 4a.
Laser projector 15 and neutral density filter 16 through 3, 14
Is installed. The laser projector 15 emits laser light toward the upper part of the other bearing bracket 4b, and the neutral density filter 16 is arranged on the front surface of the laser projector 15 so that the light quantity can be adjusted.
The tables 13 and 14 can be moved horizontally and vertically.

A PSD element (Position Sensi) is mounted on the other bearing bracket 4b through the tables 17 and 18.
A photoelectric position detection light receiver 19 and a bandpass filter 20, which are referred to as ng Device), are installed. The bandpass filter 20 is installed on the front surface of the position detection light receiver 19 and can block the background light. The tables 17 and 18 can also be moved horizontally and vertically.

The position detection signal from the position detection light receiver 19 is input to the position detection signal processing section 21, is subjected to arithmetic processing, and is output as an XY coordinate voltage. The output signal from the position detection signal processing unit 21 is recorded in the recording unit 23 through the low pass filter (f <1 Hz) 22.

These tables 13 and 14, the laser projector 15, the neutral density filter 16, and the tables 17 and 18
, Position detection light receiver 19, and bandpass filter 20
Position detection signal processing unit 21 and low-pass filter 22
And the recorder 23, the bearing bracket 4a, which supports both ends of the core base material 6 via the spindles 5a, 5b.
Relative position change amount detecting means 24 for detecting the amount of change in relative position between 4b is configured.

The pedestal 2 is attached to the floor 1 by attachment jigs 25a and 25b such as anchor bolts, and the height of the pedestal 2 can be finely adjusted by adjusting the attachment jigs 25a and 25b. .

In such an optical fiber soot manufacturing apparatus, the core preform 6 is rotated around its axis by the rotation driving means (not shown) via the spindles 5a and 5b, while the core preform 6 is rotated by the spindles 5a, 5b. The optical fiber soot 8 is manufactured by reciprocatingly driving reciprocating driving means (not shown) through 5b and the bearing brackets 4a and 4b to deposit glass fine particles on the outer periphery of the core preform 6 by the burner 7.

At this time, the change in the relative position between the bearing brackets 4a and 4b is reflected by one of the bearing brackets 4a.
The laser light emitted from the upper laser projector 15 is detected by the position detection light receiver 19 on the other bearing bracket 4b receiving the light. As the laser projector 15, for example, a semiconductor laser is used, and a built-in lens adjusts the focal length so that the laser spot diameter is minimized.
The position detection signal from the position detection light receiver 19 is input to the position detection signal processing unit 21, is subjected to arithmetic processing, and is output as an XY coordinate voltage. The output signal from the position detection signal processing unit 21 is recorded in the recording unit 23 via the low pass filter 22.

In this way, both bearing brackets 4
The amount of change in the relative position between a and 4b can be automatically detected.
Therefore, the weight sensors 10a, 10 are measured by measuring the amount of change in the relative positions of the bearing brackets 4a, 4b and by actually measuring the weight of the optical fiber soot 8.
It can be seen how much error is included in the measured weight of the optical fiber soot 8 according to b.

Based on the position data thus detected, the operator adjusts the attachment jigs 25a and 25b of the gantry 2 so that the positional deviation between the bearing brackets 4a and 4b is eliminated. The error due to the positional deviation between the bearing brackets 4a and 4b included in the measured weight of the optical fiber soot 8 can be minimized.

In this case, in the apparatus shown in FIG. 1, the change amount of the relative position between the two bearing brackets 4a and 4b is detected and the relative position between the two bearing brackets 4a and 4b is adjusted.
Specifically, it is performed as follows.

(1a) Laser light is emitted from the laser projector 15 on one bearing bracket 4a to the position detection light receiver 19 on the other bearing bracket 4b, and the coordinates (X, Y) on the position detection light receiver 19 are irradiated. ) = (0,0). Hereinafter, this position will be referred to as a reference position.

(1b) Both bearing brackets 4a, 4b are reciprocally moved in the same direction at a constant speed to change the amount of movement of the laser beam spot at each position on the rails 3a, 3b, that is, the relative position from the reference position. The amount is detected by the position detection signal processing unit 21, and the obtained amount of change in the relative position from the reference position is recorded in the recorder 23.

(1C) The operator adjusts the attachment jigs 25a and 25b of the gantry 2 so that the amount of change in the relative position between the two bearing brackets 4a and 4b measured by such a method becomes smaller, and the relative position is adjusted. Adjust so that the change amount of is small.

In this case, the weight fluctuation of the optical fiber soot 8 could be suppressed within ± 50 g.

FIG. 2 shows a second embodiment of the optical fiber soot manufacturing apparatus according to the present invention.

In the optical fiber soot manufacturing apparatus of this embodiment, the laser displacement meter 26 is mounted on both bearing brackets 4a and 4b.
a and 26b are attached to the rail 3 so that they are opposed to each other.
Reference surfaces 27a and 27b are provided on a and 3b, and reflection surfaces 28a and 28b are provided on the surfaces of the reference surfaces 27a and 27b by attaching a reflection tape or the like.
The laser light from a and 26b is reflected. The position detection signals from the laser displacement meters 26a and 26b are input to the position detection signal processing unit 21. In this case, the laser displacement gauges 26a and 26b, the reference surfaces 27a and 27b having the reflection surfaces 28a and 28b, and the position detection signal processing unit 21 are used to form the bearing bracket 4.
Relative position change amount detecting means 24 for detecting the change amount of the relative position between a and 4b is configured.

Automatic height adjusting mechanisms 29a and 29b are provided between the floor 1 and the pedestal 2 in correspondence with the bearing brackets 4a and 4b as relative positional relationship correcting means. The height automatic adjustment mechanisms 29a and 29b are, for example,
It is possible to use an actuator that is a combination of a stepping motor and a ball screw that is driven to rotate by the stepping motor to raise and lower the pedestal 2.

The output signal from the position detection signal processing section 21 of the relative position change amount detecting means 24 is an automatic height adjusting mechanism 29.
a and 29b.

Next, the detection of the amount of change in the relative position between the bearing brackets 4a and 4b and the adjustment of the relative position between the bearing brackets 4a and 4b in the apparatus shown in FIG. Is performed as follows.

(2a) Both bearing brackets 4a and 4b are reciprocally moved in the same direction at a constant speed, and at each position on the rails 3a and 3b, the reference surfaces 27a and 27b and the laser displacement meter 26a,
26b, the distances from the laser displacement gauges 26a and 26b are measured, the obtained measurement signals are processed by the position detection signal processing unit 21, and the amount of change in the distance obtained from the position detection signal processing unit 21 is received by both bearings. It is the amount of change in the relative position between the brackets 4a and 4b.

(2b) The change amount of the relative position obtained by the position detection signal processing unit 21 is given to the automatic height adjusting mechanisms 29a and 29b, and the deformation of the pedestal 2 is adjusted by the driving thereof to adjust the change amount of the relative position. Is automatically controlled in real time so that With this adjustment, the error in the measured weight due to the positional deviation between the bearing brackets 4a and 4b included in the measured weight of the optical fiber soot 8 can be minimized.

3 and 4 show the bearing bracket 4 when the optical fiber soot manufacturing apparatus having the structure shown in FIG. 2 is used.
It shows the relative position change amount between a and 4b and the measurement result of the weight change amount of the optical fiber soot. That is, FIG.
Shows that the position of the bearing bracket 4a is A, B, C, B, A
It shows the relative position change amount between the bearing brackets 4a and 4b when the change occurs as described above. In addition, FIG.
It shows the amount of change in weight of the optical fiber soot 8 when the position of the bearing bracket 4a changes like A, B, C, B, A.

As is apparent from the figure, if the deviation of the relative position between the bearing brackets 4a and 4b is corrected as in this embodiment, the weight sensors 10a and 10b such as load cells are corrected.
The fluctuation of the load due to the relative displacement between the two bearing brackets 4a and 4b can be eliminated, and the weight of the optical fiber soot 8 being synthesized can be measured with high accuracy.

In this case, the weight fluctuation of the optical fiber soot 8 could be suppressed within ± 40 g.

FIG. 5 shows a third embodiment of the optical fiber soot manufacturing apparatus according to the present invention. The parts corresponding to those in the second embodiment are designated by the same reference numerals. In the third embodiment, unlike the second embodiment, the automatic height adjusting mechanisms 29a and 29b are omitted.

In the optical fiber soot manufacturing apparatus of this embodiment, the output signal from the position detection signal processing section 21 of the relative position change amount detecting means 24 is applied to the weight signal processing unit 11 of the weight measuring means 12. ing.

Next, the detection of the amount of change in the relative position between the bearing brackets 4a and 4b and the correction of the measured weight of the optical fiber soot 8 in the apparatus shown in FIG. To do so.

(3a) Both bearing brackets 4a and 4b are reciprocally moved in the same direction at a constant speed so that the reference planes 27a and 27b and the laser displacement gauges 26a and 26a at the respective positions on the rails 3a and 3b.
26b, the distances from the laser displacement gauges 26a and 26b are measured, the obtained measurement signals are processed by the position detection signal processing unit 21, and the amount of change in the distance obtained from the position detection signal processing unit 21 is received by both bearings. It is the amount of change in the relative position between the brackets 4a and 4b.

(3b) The change amount of the relative position obtained by the position detection signal processing unit 21 is given to the weight signal processing unit 11, and the measured weight of the optical fiber soot 8 measured by the weight measuring means 12 is detected. The relative position change amount obtained by the signal processing unit 21 is automatically corrected in real time. With this correction, the error in the measured weight due to the positional deviation between the bearing brackets 4a and 4b included in the measured weight of the optical fiber soot 8 can be minimized.

In this case, the weight fluctuation of the optical fiber soot 8 could be suppressed within ± 30 g.

6 and 7 show a fourth embodiment of the optical fiber soot manufacturing apparatus according to the present invention.

In the optical fiber soot manufacturing apparatus of this embodiment, this embodiment is applied to the apparatus of the second embodiment shown in FIG. In the present embodiment, a meandering cooling path 30 is provided inside the gantry 2, and a circulation path 31 for circulating a cooling medium such as water flowing through the cooling path 30 is provided outside the gantry 2 and the circulation path 31 A temperature controller 32 for the cooling medium and a circulation pump 33 for the cooling medium are provided on the way.

By controlling the pedestal 2 at a constant temperature in this way, it is possible to prevent heat from the burner 7 and room temperature changes from being conducted to the pedestal 2, and thus to prevent thermal deformation of the pedestal 2. It is possible to further improve the accuracy of weight measurement of the optical fiber soot 8 which is being synthesized by the apparatus described above.

In this case, the weight fluctuation of the optical fiber soot 8 could be suppressed within ± 10 g.

That is, when the temperature of the gantry 2 is controlled as in the fourth embodiment, for example, the bearing brackets 4a and 4b are used.
When there is a movement between positions A and C as shown in FIG. 13, there is a change in the relative position change amount (D) as shown in FIG. 8 and a change in the weight change amount (W) as shown in FIG. In the case of a certain device, since W and D at that time are as shown in FIG. 10, the coefficient can be obtained from the following equation.

K (proportional coefficient) = ΔW (weight change) / ΔD
(Change in relative position) Therefore, the corrected weight W ′ is obtained from the following equation, and the measured weight of the optical fiber soot 8 can be corrected as shown in FIG.

W ′ = W−K · D In each of the above embodiments, the present invention is applied to an optical fiber soot manufacturing apparatus of the type in which the burner 7 is fixed and the core preform 6 is moved left and right. However, instead of this, the present invention is similarly applied to an optical fiber soot manufacturing apparatus of a type in which the core preform 6 is fixed (rotated about the axis) and the burner 7 is reciprocated left and right. be able to.

The relative position change amount detecting means 24 used in the apparatus shown in FIGS. 2 and 5 may have the structure shown in FIG.

The configurations shown in FIGS. 6 and 7 can also be applied to the apparatus having the configurations shown in FIGS. 1, 2 and 5.

[0061]

As described above, according to the optical fiber soot manufacturing apparatus of the present invention, the following excellent effects can be obtained.

According to the first aspect of the invention, the relative position change amount detecting means for detecting the change amount of the relative position between the two bearing brackets supporting both ends of the core base material is provided. It is possible to automatically detect the amount of change in position. Therefore, by measuring the amount of change in the relative position between the bearing brackets, it is possible to know how much error is included in the measured weight of the optical fiber soot.

According to the second aspect of the present invention, the relative position change amount detecting means for detecting the change amount of the relative position between the two bearing brackets supporting both ends of the core base material, and the relative position change amount detecting means for detecting the relative position change amount detecting means. Since the relative positional change amount is input, the relative positional relationship correction means for correcting the relative positional relationship between the two bearing brackets is provided so that the relative positional change amount decreases. When the positional change amount is detected, the relative positional relationship correcting means can automatically correct the deviation of the relative positional relationship between the two bearing brackets, thus improving the accuracy of the weight measurement of the optical fiber soot.

According to the third aspect of the invention, the relative position change amount detecting means for detecting the change amount of the relative position between the two bearing brackets supporting both ends of the core preform is provided, and the weight of the optical fiber soot is measured. When the relative position change amount is detected by the relative position change amount detecting means, the weight measuring means has a structure for correcting the measured weight by inputting the relative position change amount detected by the relative position change amount detecting means. An error included in the measured weight can be automatically removed by the weight measuring means, and thus the accuracy of the weight measurement of the optical fiber soot can be improved.

[Brief description of drawings]

FIG. 1 is a first embodiment of an optical fiber soot manufacturing apparatus according to the present invention.
It is a side view of an Example.

FIG. 2 is a second view of the optical fiber soot manufacturing apparatus according to the present invention.
It is a side view of an Example.

FIG. 3 is a characteristic diagram showing a relative position change amount between both bearing brackets when a bearing bracket position is changed in the device of the second embodiment.

FIG. 4 is a characteristic diagram showing the amount of change in weight of the optical fiber soot when the bearing bracket position changes in the device of the second embodiment.

FIG. 5 is a third view of the optical fiber soot manufacturing apparatus according to the present invention.
It is a side view of an Example.

FIG. 6 is a fourth embodiment of the optical fiber soot manufacturing apparatus according to the present invention.
It is a side view of an Example.

7 is a cross-sectional view taken along line XX of FIG.

FIG. 8 is a characteristic diagram showing a relative position change amount between both bearing brackets when a bearing bracket position is changed in the fourth embodiment.

FIG. 9 is a characteristic diagram showing a weight change amount of the optical fiber soot when a bearing bracket position is changed in the fourth embodiment.

FIG. 10 is a characteristic diagram showing the relationship between the relative position change amount (D) between the bearing brackets in FIGS. 8 and 9 and the weight change amount (W) of the optical fiber soot.

FIG. 11 is a characteristic diagram of a state in which the weight of the optical fiber soot is corrected when the bearing bracket position is changed in the fourth embodiment.

FIG. 12 is a side view of a conventional optical fiber soot manufacturing apparatus.

13 is a characteristic diagram showing a relative position change amount between both bearing brackets when the bearing bracket position changes in the device shown in FIG.

14 is a characteristic diagram showing the amount of change in weight of the optical fiber soot when the bearing bracket position changes in the device shown in FIG.

[Explanation of symbols]

 1 floor 2 stand 3a, 3b rail 4a, 4b bearing bracket 5a, 5b spindle 6 core base material 7 burner 8 optical fiber soot 9 gas supply unit 10a, 10b weight sensor 11 weight signal processing unit 12 weight measuring means 13, 14 table 15 Laser projector 16 Dark filter 19 Position detection receiver 20 Bandpass filter 21 Position detection signal processing unit 22 Low pass filter 23 Recorder 24 Relative position change amount detecting means 25a, 25b Mounting jig 26a, 26b Laser displacement meter 27a, 27b Reference Surface 28a, 28b Reflective surface 29a, 29b Automatic height adjustment mechanism 30 Cooling path 31 Circulating path 32 Temperature controller 33 Circulating pump

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yukio Kamura 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Furukawa Electric Co., Ltd.

Claims (3)

[Claims] 1. An optical fiber soot is provided on the outer periphery of the core preform by moving a burner for depositing glass particles on the outer periphery of the core preform relative to the core preform that rotates around an axis. In an optical fiber soot manufacturing apparatus that continuously or intermittently measures the weight of the optical fiber soot while manufacturing the optical fiber soot, an amount of change in relative position between both bearing brackets supporting both ends of the core preform. An optical fiber soot manufacturing apparatus, characterized in that a relative position change amount detecting means for detecting is provided. 2. An optical fiber soot is provided on the outer periphery of the core preform by moving a burner for depositing glass particles on the outer periphery of the core preform relative to the core preform that rotates around an axis. In an optical fiber soot manufacturing apparatus that continuously or intermittently measures the weight of the optical fiber soot while manufacturing the optical fiber soot, an amount of change in relative position between both bearing brackets supporting both ends of the core preform. A relative position change amount detecting means for detecting the relative position change amount, and a relative position change amount detected by the relative position change amount detecting means is input to correct the relative positional relationship between the bearing brackets so that the relative position change amount decreases. An optical fiber soot manufacturing apparatus, which is provided with a relative positional relationship correcting means. 3. An optical fiber soot is provided on the outer periphery of the core preform by moving a burner for depositing glass particles on the outer periphery of the core preform relative to the core preform that rotates around an axis. In an optical fiber soot manufacturing apparatus that continuously or intermittently measures the weight of the optical fiber soot while manufacturing the optical fiber soot, an amount of change in relative position between both bearing brackets supporting both ends of the core preform. A relative position change amount detecting unit for detecting the relative position change amount, and the weight measuring unit is configured to correct the measured weight by inputting the relative position change amount detected by the relative position change amount detecting unit. Optical fiber soot manufacturing equipment.